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Published: September 18, 2005
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Published: September 18, 2005
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Taroh NAKAMURA, Masayuki TAKATA
Article type: Article
Session ID: 2501
Published: September 18, 2005
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In this paper, we proposes the technique to solve a large-scale process scheduling problem efficiently. A number of local schedulers that use the search algorithm are made to cooperate, and the schedulers solves it by dividing the problem of becoming an object into a number of small problems by controlling the schedulers with a global scheduler that exists in the upper layer. Therefore the restriction condition between the processes is structured according to the locality. The scheduling system that achieved the method for proposing was actually constructed by using the knowledge base system, and the experiment and the evaluation of the system were conducted on the computer.
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Kazuhiro Kawaai, Masayuki TAKATA
Article type: Article
Session ID: 2502
Published: September 18, 2005
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In this research, we proposed the method for controlling the trade-off between the calculation cost and the performance of the solution for obtaining the schedule solution in process scheduling. Since computational cost indispensable in order to calculate the schedule solution corresponding to a demand cannot be predicted, it uses the policy of improving a solution gradually to require a provisional solution. The reptition is completed when a schedule solution with the desired cost performance while this system monitors calculation time is obtained.Such a technique was built using the knowledge based system, implemented and evaluated.
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Akira TSUMAYA, Tadashi NAKAYAMA, Minoru KOIKE, Hidefumi WAKAMATSU, Eij ...
Article type: Article
Session ID: 2503
Published: September 18, 2005
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The concept of autonomous & distributed production systems has been proposed in order to cope with various disturbances in recent years. However, it is required for the production system to realize more high flexibility and performance. In this paper, dynamic production scheduling system that considers set-up time is proposed. We focused on the combination and timing of processing sequences on both processing cells/parts, analyzed set-up time in detail, and proposed timing rule and set-up time rule in selection. Then, these rules are introduced in dynamic production scheduling system and applied to a case study.
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Hidehiko Yamamoto, Etuo Marui
Article type: Article
Session ID: 2504
Published: September 18, 2005
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This paper describes the parts input problem of production system where two FTLs (Flexible Transfer Lines) are linked under JIT production management. In this paper, new parts input real-time control method REPAIR is proposed. REPAIR is useful when the FTLs are operated under the production order that is different from the pre-decided production scheduling. By applying REPAIR for a virtual production system, it is ascertained that REPAIR is a useful real-time control system that does not give a bad influence if a production order that is different from pre-decided production scheduling is suddenly given.
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Tatsuya MORIYAMA, Jae Kyu Yoo, Yoshiaki SHIMIZU
Article type: Article
Session ID: 2505
Published: September 18, 2005
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In order to keep production balance at a mixed-model assembly line and a painting line, large WIP (Work-In-Process) inventories are required between two lines. To increase the efficiency of line handling through reducing the inventories under this circumstance, this paper concerns with a sequencing problem for a mixed-model assembly line that includes a painting line where the uncertain elements regarding the defective products exist. Then, we formulate a new type of the sequencing problem minimizing the line stoppage time and the idle time with forecasting the supply time of the products from the painting line. Finally, we examine the effectiveness of the proposed sequencing through computer simulations.
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Shigeharu MATSUDA, Hideaki FUSHIMI, Takeshi WADA, Yoshiaki SHIMIZU
Article type: Article
Session ID: 2506
Published: September 18, 2005
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We have applied the meta-heuristic method termed Hybrid Tabu Search to solve a hierarchical logistics optimization problem under uncertain demands. For this purpose, we have formulated the problem by employing the idea from flexibility analysis. There, first, we classified the decision variables into two kinds depending on their generic natures, e.g., hard one like facility location not easy to change after decided once and soft one like distribution route possible to change somewhat according to the demand fluctuation. Then the proposed method can derive a flexible design that can cope certainly with the worst case only by changing the distribution routes while keeping the performance at higher level in the nominal case. Through numerical experiments, we confirmed effectiveness of the proposed method.
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Masahiko ONOSATO
Article type: Article
Session ID: 2507
Published: September 18, 2005
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The paper deals with a new method for describing detail situations of production activities based on the virtual manufacturing technology. The author has proposed a knowledge acquisition and utilization framework named Active Knowledge Archive (AKA) in which decision makings by expert designers or engineers are recorded with the descriptions of production situations. Three dimensional simulation models of manufacturing systems based on the virtual manufacturing approach are conveniently used for the reference of situation descriptions.
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Toshitake TATENO
Article type: Article
Session ID: 2508
Published: September 18, 2005
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This paper deals with a work support system to support novice workers in production, maintenance and disassembling work. We have developed a new support system that checks operation executed by workers with interaction between a worker and the support system. We call it work monitoring. In this paper, a method to adapt work instructions to the worker by using worker model is shown. Work monitoring is used not only for work support but also for learning support. A prototype system is developed to explain how to built and use the worker model. The system detects work pieces and work time by RFID, and builds worker model by counting up the executed tasks. Then, the system chooses an instruction level according to the worker model. The prototype system shows the ability of the system to realize work and learning support at a time.
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Hidetoshi TAKAHASHI, Tohru IHARA, Teppei OHYA, Bandit SUKUSAWAT, Hiroy ...
Article type: Article
Session ID: 2509
Published: September 18, 2005
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Recently, a new educational system as post-QJT (On the Job Training) is needed for globalizing of the enterprise and decreasing about the engineer. Then we constructed the skill education support system by e-Learning to the remote place region. The features of this system are that the movement type arm robot demonstrates the machine operation to the learner, and the expert engineer educator in the remote place observes and advises. In this report, it reports why the movement type arm robot and educator's observation and advice are necessary. First of all, we paid attention to educator's mental model Next, we paid attention to learner's viewpoint, and did the verification experiment to clarify what the learner felt. As the result, three of the following became clear. First, it is a critical factor that the educator does a prior demonstration and watches learner. Second, the learner's consideration is different, when the educator is on the learner's side or not existing. Third, the learner needs the person who can response to the question. Therefore, we constructed, and propose the skill education support system with the above-mentioned.
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Nobuhiro SUGIMURA, Naoki SATONAKA
Article type: Article
Session ID: 2510
Published: September 18, 2005
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Mathematical methods are discussed, in the paper, to estimate the statistical deviations of the positions and the orientations of the geometric features, based on the deviation parameters and the relationships between the datum features and the target features. In particular, emphasis is given to the analysis of the statistical deviations of the geometric features under the MMC (Maximum Material Conditions), which specifies the interaction between the dimensional tolerances and the geometric tolerances. The proposed method is applied to the analysis of the deviations of the geometric features, to which both the dimensional tolerances and the geometric tolerances are required.
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Hitoshi TAKAYANAGI, Yoshihide OKAMURA, Kazuhiro MIYAJI, Ryouji TAMURA, ...
Article type: Article
Session ID: 2511
Published: September 18, 2005
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This paper describes a development of scheduling system for an aluminum hot rolling process. A scheduling of hot rolling process is consist of three elements that a decision of rolling sequence, a selection of furnace and an arrangement of slabs in a furnace, and it requires special knowledge because there are many constraint for the decision of above scheduling process. Consequently, we have developed a scheduling system which uses local search method and heuristic approach, and it makes possible to plan a hot rolling scheduling without skilled processing staff.
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Yoshiyuki IEMOTO, Shuichi TANOUE, Takeji KAWAKAMI, Yasuo IZAWA
Article type: Article
Session ID: 2512
Published: September 18, 2005
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A parts feeder is a device that arranges works (machine and electronic parts, and tablets, etc.), which are supplied in random posture from former process, automatically in constant posture, and supplies them to the next process. In this report we propose a high-speed parts feeder of a new mechanism composed of a hopper and one or more rails, and show that it can arrange either hexahedrons with three different sizes or disks of works at high speed in constant posture.
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Katsumi Masaki, Minoru Yoshii
Article type: Article
Session ID: 2513
Published: September 18, 2005
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We made the products structure and the production process group structure revolutionized, and developed the production system that pursued making to the speed and making flexibly. As a point of the development execution ・The stay of the person, the product, and information is lost ・The technical intelligence in the engineering process and data in the supply chain are organically integrated. ・Quality conclusion by functional processing module, High-speed arrangements making and the Stoccpointores production are achieved.
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Toshiaki YOSHINAGA, Yoshimi OTA, Koichi SHIBAO, Yasuo YOSHINARI, Yuji ...
Article type: Article
Session ID: 2514
Published: September 18, 2005
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We have promoted the IMS (Intelligent Manufacturing Systems)-VIPNET (Virtual Production Enterprise Network) project in the plan from 2000 for five years. The purpose of IMS-VIPNET is embodying the VIPNET which can do optimal combination of core competences. For this reason, in IMS-VIPNET, the Technology Knowledge Infrastructure (TECHNO-INFRA) covering life cycles, such as a product, and technology, service, which accumulates, shares, utilizes and creates information and knowledge has been built. The basic architecture of the Technology Knowledge Infrastructure was developed. Moreover, the technology of information and knowledge description model GPM (Generic Product Model), the GPM DWH (Data Warehouse), the knowledge processing system, etc. were also developed. The developed technologies were applied to the real process plants and the practicality was checked. This paper reports the outline of IMS-VIPNET.
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Yoshimi OTA, Toshiaki YOSHINAGA, Koichi SHIBAO, Yasuo YOSHINARI, Yuji ...
Article type: Article
Session ID: 2515
Published: September 18, 2005
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We have promoted the IMS (Intelligent Manufacturing Systems)-VIPNET (Virtual Production Enterprise Network) project in the plan from 2000 for five years. The purpose of IMS-VIPNET is embodying the VIPNET which can do optimal combination of core competences. For this reason, in IMS-VIPNET, the Technology Knowledge Infrastructure covering life cycles, such as a product, and technology, service, which accumulates, shares, utilizes and creates information and knowledge has been built. The basic architecture of the Technology Knowledge Infrastructure was developed. Moreover, the technology of information and knowledge description model GIM/FNL (Generic Information & Knowledge Model/ Formal Natural Language), the GIM/FNL DWH (Data Warehouse), the knowledge processing system, etc. were also developed. The developed technologies were applied to the real process plants and the practicality was checked. This paper reports the information and knowledge description model.
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Koichi SHIBAO, Yoshimi OTA, Toshiaki YOSHINAGA, Yasuo YOSHINARI, Yuji ...
Article type: Article
Session ID: 2516
Published: September 18, 2005
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We have promoted the IMS (Intelligent Manufacturing Systems)-VIPNET (Virtual Production Enterprise Network) project in the plan from 2000 for five years. The purpose of IMS-VIPNET is embodying the VIPNET which can do optimal combination of core competences. For this reason, in IMS-VIPNET, the Technology Knowledge Infrastructure covering life cycles, such as a product, and technology, service, which accumulates, shares, utilizes and creates information and knowledge has been built. The basic architecture of the Technology Knowledge Infrastructure was developed. Moreover, the technology of information and knowledge description model GPM (Generic Product Model), the GPM DWH (Data Warehouse), the knowledge processing system, etc. were also developed. The developed technologies were applied to the real process plants and the practicality was checked. This paper reports the knowledge processing system.
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Yoshimi OTA, Hideo OHBA
Article type: Article
Session ID: 2517
Published: September 18, 2005
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The Japan Aerospace Exploration Agency (JAXA) is developing the Emergent Synthesis Environment (ESE) for next-generation space systems. ESE aims at innovation in the conventional operating process, increased efficiency of R&D, and improved reliability of space systems. We are developing the Generic Information Knowledge Model and the Formal Natural Language (GIM/FNL) to be used as the base of the Technology Knowledge Infrastructure (TECHNO-INFRA) of ESE. GIM is a general-purpose semantic network model, which uses the predicate as the core, an important feature that can also describe the syntax of natural language. The Formal Natural Language (FNL) describes GIM using the syntax of natural language. GIM/FNL enables us to accumulate, share, and use practical knowledge concerning the life cycle of space systems. Therefore, improved efficiency and reliability of space systems can be expected.
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Kosuke Nakamura, Makoto Tami
Article type: Article
Session ID: 2518
Published: September 18, 2005
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The switch module automatic operation processing assembly system that crowded and achieved a high yield, stock-less, and the shortest lead time for many varieties by manufacturing various kinds of products method assumed that the flow in the diverse-types-and-small-quantity production age was received, crowded, the connection between the quality conclusion, the model group same equipment, and the process and synchronization assumed to be a concept while needs of manufacturing various kinds of products increased, and the difficulty high was developed. Especially, arrangements (arrangements substitution-less) in the automatic operation were achieved for many varieties, the medium such as RFID was not used to transmit product instruction information that became the backbone, and the effect such as making of equipment a low cost was achieved by adopting the virtual information transmission method.
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Yukio Minamoto, Kazuki Kawata
Article type: Article
Session ID: 2519
Published: September 18, 2005
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In the production of commodity characterized by limited production of a wide variety of products, A big problem the production that synchronizes with demand is achieved is a decrease of the manufacturing efficiency because of the arrangements loss generated every time the order changes. To solve the problem, the system that supported the operator's work by in real time understanding model information on the commodity that flowed in each process in line was developed. The arrangements substitution loss was minimized by introducing this system, and the cell production line to manufacture various kinds of products with same equipment in the aim of production synchronized with customer's demands was able to be constructed. Our paper reports on the above-mentioned approach case.
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Fumihiro ITOIGAWA, Takashi NAKAMURA, Masahiro YAMADA
Article type: Article
Session ID: 2601
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In high-speed milling of aluminum alloy, flood coolant application has conventionally used to avoid adhesion of work material onto a tool surface. However great effort to reduce use of lubricant has being made to tackle growing environmental problems. Although MQL is one of the methods to reduce use of lubricant greatly, it can not successfully replace conventional flood emulsion because of less cooling ability. Oil-on-water droplet cutting fluid can cover the shortcoming of the MQL because it has large cooling ability. Furthermore, the OoW can reduce cutting force in comparison with that in the both cases of flood coolant and MQL applications. In this study, effect of the cooling ability of the OoW on reduction in cutting force is investigated in aluminum alloy milling. It is suggested that lubricant can effectively serve good performance and then reduce the cutting force only if tool surface can be sufficiently chilled.
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Yasuo SUZUKI, Katsuhiko SAKAI, Hiroo SHIZUKA
Article type: Article
Session ID: 2602
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Dry cutting makes tool's life short because of lack of cooling factor. Generally speaking, heat generation in cutting are deformation heat, fractional heat, and oxidation heat. So we tried the nitrogen cutting; that is the cutting process in nitrogen gas, to reduce the oxidation heat. In this study, relation between nitrogen concentration and tool life was examined. Consequently, it was found that the nitrogen cutting was effective.
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Yasuo SUZUKI, Katsuhiko SAKAI, Kanami NAKAMURA
Article type: Article
Session ID: 2603
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Today, cutting oil is used in cutting for lubrication, cooling and removing chips. Recently, Minimum Quantity Lubrication cutting is investigated for environmental problems. But mist is fly in all directions in mist cutting. So we suggest using gelated cutting fluid instead of conventional cutting oil. Because we expect gelated cutting fluid has good lubricate properties and cooling effect, and it prevents mist splashing all over. In addition it is water-soluble polymer with a high proportion of water, so it has little effect on the environment and working circumstances are improved. We compared the cutting performance of dry cutting, mist cutting using gelated cutting fluid and soluble cutting oil. Consequently gelated cutting fluid has a good cutting performance and cooling effect. And it prevents mist flying into factory environment.
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Yoshimasa MIHARA, Yasuo SUZUKI, Katsuhiko SAKAI
Article type: Article
Session ID: 2604
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In machining, it is a task that reducing consumption of cutting fluid. Machining with supplying the oil mist has been suggested and performed as one of the environment-friendly machining. But, not all mist attaches the machining point, but partly keeps suspended in the air. In this study, we charged the oil mist electrically in order to collect it at the machining point and to reduce suspended mist. As the experimental results, the surface roughness in turning with electrical charged mist is improved in comparison with non-electric charged mist and dry condition, and it means the effective usage of cutting fluid.
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Hiroyasu IWABE, Hisashi ENDO, Kazuo NAKAMOTO
Article type: Article
Session ID: 2605
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In this paper, the flank wear and the surface roughness of machined surface are investigated by high speed milling of hardened steel for a small size ball end mill. And it is investigated that the influence of a tool life on the inclination angle of workpiece and the minimum qualify lubrication (MQL) method. In case of the carbide tool, it is shown that the long tool life and the small surface roughness are obtained by the conditions of down milling and the MQL method to end point of cutting. In case of the connected tool with carbide and alloy steel, it is shown that the long tool life is obtained only in the conditions of step up pick feed, and the surface roughness becomes large.
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Hirofumi MORITA, Keiichi NAKAMOTO, Toshimichi MORIWAKI
Article type: Article
Session ID: 2606
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The optimization of the tool trajectory of 5-axis milling still presents a considerable challenge, though current CAM systems not only generate NC programs but also include functionalities of the cutting simulation. The reason comes from the fact that commercially available cutting simulators focus on only avoiding collisions among the machined part, the machine tool and the cutting tool. The tool trajectory should be optimized with regard to the geometrical constraints and the dynamics of the process such as the cutting force, the tool deflection and the machine tool vibration. Li this study, in order to analyze the relationship between the tool posture and the cut surface roughness, a support system for 5-axis ball end milling to analyze machined surfaces was developed and fundamental cutting experiments were conducted. The experimental results of the surface roughness measurements are compared with the computed geometry of the cut surface to be obtained by the developed simulator.
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Takenori ONO, Takashi MATSUMURA
Article type: Article
Session ID: 2607
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper discusses machining characteristics in the milling processes of glass with the feed direction. The machined surfaces are observed to determine the maximum feed rate where brittle fracture does not occur. It is shown that the feed direction has a large influence on the machined surface. Milling in a down-cut manner leaves brittle cracks on the machined surface. When the milling tool is fed against the inclination of the milling tool, the effect of contact area on the flank face of the edge with workpiece increases to leave brittle cracks. The critical feed rates are determined in the cutting tests with changing the feed direction. Crack free surfaces are made at a high feed rate in an up-cut manner.
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Koichi OKUDA, Yoshihisa TAKENO
Article type: Article
Session ID: 2608
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper describes a basic machinability of hardened steel in precision cutting. High accuracy and high efficiency machining of micro parts such as a contact probe for a current inspection of semiconductor has been demanded. For its realization, it is essential to understand the micro cutting phenomenon such as the surface texture, the tool wear with small depth of cut and low cutting speed. In this study, the precision cutting experiments of a carbon tool steel (SK105) by cermet and ultra-fine grained carbide tools were carried out with an ultra-precision cutting machine. It was found that the feed rate, the cutting speed and the edge sharpness of tool significantly influence the surface finish.
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Libo ZHOU, [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Session ID: 2609
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Aiming toward the complete conversion to fixed abrasive process of single crystal silicon wafer, the Chemo-mechanical grinding (CMG) process which positively adopts chemical action to grinding process was proposed. Development and its appraisal experiment of the CMG wheel with EPD (electrophoretic deposition) were done in this research. Ceria (CeO2) abrasive and sodium alginate (used as binder) were used to grow pellets and the pellets were allocated peripherally to form CMG wheel. The effects of abrasive concentration, binder concentration ratio and applied voltage on the CMG wheel growth were investigated. The property of produced pellets and grinding performance of CMG wheel were experimentally studied.
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Daisuke NONAKA, Junichi IKENO, Hideo SHIBUTANI
Article type: Article
Session ID: 2610
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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It has been demonstrated that damage less mirror grinding of silicon wafer is realized by EPD pellet. However, the surface roughness after EPD grinding is on the order of 10nmRz. In this study, brush cleaning and O_3/HF cleaning operations were carried out, and it found that the roughness of EPD ground surface after these operations was 5nmRz or less. This result may show that the roughness have been measured the ground surface which constituents of the EPD pellet was adhered.
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Ryosuke TAKAGI, Nobuo YASUNAGA, Yukiharu YAMAMOTO
Article type: Article
Session ID: 2611
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Needs for SiC single crystals as next generation high power electronic and optoelectronic devices are increasing. Mechanochemical polishing (MCP) is suitable for the final damage-free surface finishing process for such extremely hard high functional materials. Cr_2O_3 is already known as one of the useful MCP abrasives for SiC crystals but actual use of Cr_2O_3 abrasive in the production field is hesitated because of anxiety of Cr^<6+> formation as the origin of the environmental pollution. In this paper possibility of α-Fe_2O_3 as a environmentally safe MCP abrasive is investigated. Polycrystalline SiC wafers are MCPed on a newly developed high temperature polishing machine. Results obtained are (1) α-Fe_2O_3 abrasive produces the highest polishing efficiency at a polishing temperature about 230℃, which is more efficient than that obtained by Cr_2O_3 abrasive polishing at any experimental temperature between R.T.〜330℃, (2) no mechanical scratches are detected suggesting no existence of subsurface damages and (3) unevenness per each crystal grain resulting in large surface roughness Ra over several tens nm is observed which is peculiar to MCP of anisotropic polycrystalline ceramics.
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Nobuhito YOSHIHARA, Tsunemoto KURIYAGAWA
Article type: Article
Session ID: 2612
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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At present, aspherical parts are installed in various optical instruments. To improve the resolution of the optical instrument, higher form accuracy is required for aspherical parts. To meet this demand, an arc envelope grinding method has been developed. In the arc envelope grinding process, a spherical shaped grinding wheel is used and the form error of the cross-sectional profile of the grinding wheel is transcribed to the workpiece profile. Therefore, the grinding wheel should be trued previously. However, the form error of the grinding wheel cannot be removed perfectly. To reduce the affect of the form error of the grinding wheel, compensation grinding must be carried out. In this research, the wheel path of a new compensation grinding method is proposed. Tests using the new compensation grinding method demonstrate the reduction in the form error of aspherical parts.
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Hitoshi OHMORI, Weimin LIN, Shin-ya MORITA, Yoshihiro UEHARA, Yutaka W ...
Article type: Article
Session ID: 2613
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The ELID-grinding R&D activities on development of large optics for astronomical observatory and semiconductor fabrication, have been accelerated in these years. The authors developed the large aspheric nanoprecision ELID-grinders such as "L-uaoe-GIC", "N-aou-VEL", etc. for these purposes. In this paper, the authors introduce the examples of ELID-ground large mirrors and the new turning grinding method with the exclusive large and indexable rotary table which was newly developed specifically for fabrication of large telescope mirror segments efficiently. The developed rotary table was successfully mounted on a large aspheric ELID-grinder. A new additional finishing process method was also devised on the machine.
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Weimin LIN, Hitoshi OHMORI, Shin-ya MORITA, Yutaka WATANABE, Yoshihiro ...
Article type: Article
Session ID: 2614
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A new MRF finishing tool for finish the large free form surface had developed. In this paper, the concept of FREEDOM method MRF tool and design is discussed.
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Manabu IWAI, Shinichi NINOMIYA, Yukinori TANAKA, Sadao SANO, Katsutosh ...
Article type: Article
Session ID: 2615
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Electrodischarge grinding was carried out with a metal bonded diamond wheel containing electrically conductive diamond grits. In this research two effects i.e. removal action of workpiece by electrical discharge machining during grinding process and in-process dressing action of the cutting edges on the grits are expected. Electrodischarge grinding tests for cemented carbide indicated a significant decrease of 21% in the grinding force when the set discharge current was increased from 0A to 12A. It is also clarified from grinding tests with or without electrodischarging during 200 grinding passes alternately that stable grinding characteristics along with the decrease in the grinding force can be achieved. High-speed camera photographs indicate that a stable discharge condition was achieved.
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Mitsuyoshi NOMURA, Yongbo WU, Masana KATO, Toru TACHIBANA, Tsunemoto K ...
Article type: Article
Session ID: 2616
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper describes an experimental investigation on the effects of ultrasonic vibration in the truing of the small CBN grinding wheel. In the present work, a new truing technique is proposed, where the grinding wheel is ultrasonically vibrated in its axial direction during the truing operation using a rotary GC cup dresser. In order to validate the proposed technique, experiments are carried out. The influences of the truing parameters on the truing force and the run-out of grinding wheel were investigated. The truing force applying ultrasonic vibration to the grinding wheel decreases more than 22% compared with that without ultrasonic vibration. The run-out of grinding wheel with ultrasonic vibration is achieved less than 0.8μm from original value of 150μm, while that obtained without ultrasonic vibration is more than 1.1μm.
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Shinichi NINOMIYA, Manabu IWAI, Yoshiaki Shishido, Tetsutaro UEMATSU, ...
Article type: Article
Session ID: 2617
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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To improve the characteristic of the floating nozzle method, a new coolant supply method using a coolant flow guided flexible sheet was developed. In this method, all the coolant supplied from the nozzle outlet can surely be directed immediately to the grinding point, because the coolant flow guided flexible sheet made of a thin sheet material is attracted to the wheel surface automatically, and confines the coolant between the wheel surface and the sheet. Therefore, the coolant can be completely prevented from deviating away from the grinding point. In fact, when the coolant flow rate of 4l/min was supplied from the upper part of the wheel by using this method, the amount of coolant that reached the grinding point was 18 times higher than the case of only the floating nozzle method. It was clarified that this method had the effect to improve the grinding performance.
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Jun'ichi TAMAKI, Akihiko KUBO, Xijun KANG
Article type: Article
Session ID: 2618
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Cutting edge truncation is a micro-truing process in which the diamond cutting edges of grinding wheel are truncated and aligned at the same height. In this study, surface plunge grinding has been simulated to clarify the effect of cutting edge truncation on the grinding mechanism in terms of the maximum grain depth of cut and finished surface roughness. It is found that a surface roughness of nanometer order is possible to generate by the truncation of a coarse-grained grinding wheel but the contribution to a decrease in the maximum grain depth of cut is not enough, so that proper selection of a fine-grained grinding wheel as well as suitable truncation are necessary for ductile-regime grinding, which requires the maximum grain depth of cut less than a value realizing ductile-mode material removal.
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Hitomi YAMAGUCHI, Takeo SHINMURA, Tsuyoshi HASHIMOTO
Article type: Article
Session ID: 2619
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Smoothly finished surfaces inside and outside improves the translucency of the arc tubes used for high intensity discharge lamps. Magnetic abrasive finishing is applicable for both internal and external finishing of components. Internal magnetic abrasive finishing has the advantage of application in areas hard to reach by conventional mechanical techniques. External magnetic abrasive finishing has the advantage of improved form accuracy. This study proposes the simultaneous internal and external finishing for alumina ceramic tubes used for the arc tubes by simply combining the two independent magnetic abrasive finishing operations. The finishing experiments of alumina ceramic tubes showed the feasibility of the simultaneous internal and external finishing without degrading the finishing characteristics of either operation. Obviously, combining the processes improves the finishing efficiency.
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Yanhua ZOU, Takeo SHINMURA
Article type: Article
Session ID: 2620
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The problems existed in the deburring process of a drill processing hole on the inner surface of a pipe. This research examined experimentally the deburring of a drill processing hole on the inner surface of a SUS304 stainless steel tube by using "Magnetic Field Assisted Machining Process used the magnetic machining jig". A processing unit and magnetic machining jig was made, the processing unit was set on the lathe machine. In this study, deburring experiment performed for a drill processing hole of 3mm in diameter. The results showed that the burr enables was removed by using this deburring process, and the height of burr was able to be decreased from 165μm to 1μm.
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Shujie LIU, Shuichi NAGASAWA, Satoru TAKAHASHI, Kiyoshi TAKAMASU
Article type: Article
Session ID: 2621
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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AFM is used to measure the surface of the material with high accuracy. Here we want to use AFM to measure the surface profile of resist. If the measurement object is softer than the stylus, AFM may deform it in measurement. In order to measure the surface profile of resist with high accuracy, it's necessary to investigate the solid-state profiles of resist and influence of the AFM tip on the resist surface. So, in this research, we simulate the relationship between the shape, size and load of the indenter and the deformation with FEM (Finite Element Method), and discuss the influence from the force-displacement curve.
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Koshiro WADA, Hiroto HAYASHI, Hideaki HARA, Hideki UENO
Article type: Article
Session ID: 2622
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We have developd a new method for diesel injection quantity measurement. It is difficult to measure it with high precisin for quick interval injection, so using a principle that the compressed volume by injection occurs the pressure rise in a chamber full of fuel, it is shown for the measurement method to distribute total injection quantity measured by volume flow meter to shot by shot injection by the pressure rise.
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Shuichi DEJIMA, Takashi MIYOSHI, Yasuhiro TAKAYA, Yoshihiro MAENO
Article type: Article
Session ID: 2623
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper describes a new system to detect defects on the cam shafts of automobiles. The theory, based on laser scattering, is studied first, and then its feasibility is confirmed through basic experiments and simulations. Next, an inspection system is designed and built to verify the effectiveness of the method. The line laser, employed as a light source, illuminates the cam surface and its grey-scale image appears on a CCD as a white line, on which the missing part can be detected when there is a defect. The experimental results show that there is a big correlation between the size of the defect and the missing width. By scanning the laser over the entire surface of the cam shaft, the size and the shape of the defect was measured.
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Yasuhiro TAKAYA, Panart KHAJORNRUNGRUANG, Terutake HAYASHI, Takashi MI ...
Article type: Article
Session ID: 2624
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The aim of this study is to develop a new measuring technique bsed on laser diffraction such as Fraunhofer diffraction theory which is called the diffraction gauge method. This method makes it possible to evaluate a three-dimensional cutting-edge profile of a micro-endmill with precision of better than 100nm even though on-machine measurement. The measurement resolution was experimentally achived to be 15nm for a helical endmill and repeatability of ±50nm with valid accuracy for new tool. In this paper, in order to verify that the diffraction gauge method is of practical use such as on-machine measurement, the three-dimensional cutting edge profile measurements of a worn tool with the diameter of 0.3mm, which has performed side milling on graphite with 40000 rpm rotational speed, is discussed. The experimantal results show that the diffraction gauge method has enough high performance to be able to evaluate wear quantity of a worn micro endmill.
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Takanori Fujiwara, Masahiro Miyagawa, Akinori Omori, Yasuhiro Takahash ...
Article type: Article
Session ID: 2625
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In this study, fundamental characteristic of the cross axis grinding method, in which the directions of both the grinding wheel speed and the workpiece speed are right-angled, with the small diameter grinding wheel is experimentally investigated. Grinding conditions, such as the feed rate, the grinding speed, the cross angle (the angle between the workpiece peripheral surface speed and the grinding speed) and the setting depth of cut, are varied systematically. Consequently, it is made clear that the optimization of grinding conditions might realize the surface roughness improvement.
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Hideki SHIBAHARA, Kazunori MASAMOTO, Seido KODA
Article type: Article
Session ID: 2626
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Lost-motion is a major disturbance to the contouring accuracy of NC machine tools employing plain slideways. In order to solve such problems, many compensation methods for lost-motion have been developed to improve them. However, these conventional methods have not been able to compensate some behaviors. In this paper, lost-motion characteristics were measured under various sliding speed. From these results, a new experimental model as a function of reverse motion error, reduction of lost-motion and table lift is proposed. Measured lost-motion errors coincide well with simulated results.
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