The objective of this study is to achieve high precision and high efficiency machining process for industrial components of the PEEK such as an inspection socket of a connector or the semiconductor package. In order to solve these problems, this study carries out cooling workpiece by cold gas supply. This paper describes the investigation result of the effect of cold gas cooling on hole accuracy and cutting state in the small hole machining of PEEK. As a result, it was found that cooling the workpiece is effective to suppressing the cutting heat and improve hole accuracy. Within the experimental conditions, the combination of non-step drilling and cooling enables high-precision drilling with approximately the same accuracy as step drilling.

In a cloud-based manufacturing (CM) environment, participating companies share their manufacturing resources. This paper proposes a matching mechanism between resource sellers and buyers in a CM environment. The target model of this study consists of multiple sellers, buyers, and a coordinator. The coordinator uses the scheduling auction-based cooperation game (SACG) to determine an efficient matching between sellers and buyers and a fair revenue distribution among the sellers. SACG consists of two stages: scheduling auction and revenue distribution. In the first stage, each seller submits information about when it can provide the facilities. A buyer makes multiple bids for different combinations of the release date, due date, and required usage time. In the second stage, SACG evaluates the contribution of the companies providing their resources by the Shapley Value. Since the proposed method determines the buyers’ payments with the Vickrey-Clarke-Groves (VCG) mechanism, it satisfies strategy-proofness for the buyers, but not necessarily for the sellers. However, computational experiments reveals that if sufficient number of sellers and buyers participate in CM, sellers are not rewarded by deceitfully raising their reserve prices.

Selective laser melting (SLM) is one of the additive manufacturing (AM) methods which is applicable to metal. Although this technology enables to form complex inner shapes such as lattice structure, steep temperature gradients due to local laser irradiation and uneven heat conduction during the process may cause bending and cracking of the product. In this study, the influence of laser power and scanning speed on the mechanical characteristics of the support structure and lattice structure formed by SLM is investigated. In the tensile test of the support structure, a positive correlation with volumetric energy density was confirmed. In the compression test of the lattice structure, it was clear that larger amount of heat energy from the laser makes struts of lattice structure thicker and its Young's modulus higher.

Pattern effect as dishing and erosion on Cu-CMP process become a serious problem to fabricate multilevel interconnect in advanced ULSI devices. In the current study, planarization models using patterned wafer and ANSYS software are suggested to make precise predictions of the post-CMP surface height to support optimize the layout design. The slurry flow effect on the copper body has been investigated and the removed mass character is monitored through the stress distribution at the solid domain. By determination of the removal regions by the calculation, we can avoid the dishing and erosion areas in the patterned area from the post-CMP process.

This study aims to develop a SERS (surface enhanced RAMAN scattering) substrate by using the electric field enhancement effect generated by rhombic structures of thin Au film. First, the electric field distribution near the rhombic structure of a thin Au film induced by an incident laser beam was simulated by FEM of COMSOL Multiphysics. Then, rhombic structures of a thin Au film were fabricated by using the Nano Plastic Forming method, and the effects of geometry of the rhombic structure on the enhancement factor EF was studied. It was verified that the Raman enhancement factor EF can be improved by adjusting geometry of the rhombic Au film structure.

Laser forming was discussed to apply as a post-processing technology for carbon fiber reinforced thermoplastics (CFRTP) in this study. Laser forming characteristics of the CFRTP sheets were experimentally investigated using a CO2 laser with the wavelength of 10.6 μm and the peak power of 100 W. The laser forming was carried out by scanning a laser beam of 5 mm squared-shape on the surface of the CFRTP sheet. The CFRTP sheet could be bent by thermal stress of the laser beam scanning, and bending angle could be controlled by temperature on the surface of the CFRTP sheet depend on the scanning speed.

In this study, factors of mold releasability from workpiece surfaces processed by milling which is generally applied to metal molds were investigated. The several workpiece surfaces with different surface roughness were processed mainly by varying feed pitch of a ball end mill. As a result of mold releasability test of the surfaces with different surface roughness and investigation of relationships between surface roughness parameters and mold release forces, the mold release force tends to increase as maximum height roughness Rz and average length RSm increase. It is considered that physical anchor effects at the compression moldings become stronger with the increases of Rz and RSm.

A metrology method for determining the probe sphere diameter of a micro coordinate measurement machine (CMM) based on Whispering Gallery Mode (WGM) resonance has been proposed. In this study, the electric field intensity distribution of WGM resonance on the microsphere surface will be measured using a near-field optical probe to obtain the angular mode number, which is necessary to estimate the diameter accurately. In this paper, a glass probe was manufactured through heat-pulling, and the aimed probe tip shape was attained.

This study proposes an evaluation method for the coupling characteristics based on the measured frequency function. Stiffness and damping can be identified from the resonance frequency and maximum vibration amplitude at the resonance frequency, respectively. Characteristics of various types of coupling; leaf-spring type couplings and a resin type coupling are evaluated by the proposed method to compare the difference of the characteristics. As the results, it is confirmed that the proposed evaluation method can adequately evaluate the coupling stiffness and damping characteristics. In addition, the difference of the characteristics of different types and structures of coupling can be evaluated and compared by the proposed method.

The S-shaped cutting test proposed by China as a cutting performance test of a 5-axis machining center has been adopted as an informative annex to ISO 10791-7: 2020. However, in this test, it is known that not only the performance of the machine but also conditions such as the CAD/CAM software for making the test piece model and NC code affect the result. In this paper, by observing the acceleration/ deceleration behavior of the machine using the NC program actually created using the commercially available CAM, the problems of NC program and CAM system are clarified.

A small and high-strength spiral bevel gear fabricated using a five-axis controlled machining center has been developed. In this paper, we propose a novel spiral bevel gear with a rib at the end of the face width to reinforce the tooth bending strength, which is machined with a ball-nose end-mill tool. We investigated the influence of the rib shape and size on the maximum stress at the tooth and rib root fillet. The results revealed a novel guideline for designing the rib shape and size at the end of the teeth width for the small and high-strength spiral bevel gear.

The aim of this study is to investigate the determination factors of the unidirectional positioning repeatability (UPR) in machining centers. In a machining center, when the same positioning test was run for 30 cycles, the positional deviation decreased stepwise about every 5 cycles at f=1000 mm/min. It was found that an operating sound from an oil temperature regulator occurred at the same time interval as the occurrence of the step. In this measurement, only an interferometer attached the spindle was related to the spindle cooled by the oil temperature regulator. From the measurement results of the spindle orientation, it was found that the measurement results of the X-axis positional deviation included the influence of the spindle orientation.

Our laboratory has developed an FFF AM system that can use any continuous fibers including cotton, silk, and hemp, or other yarns for fabrication without cutting them. This method provides not only to strengthen the tensile strength of the formed objects but also to realize an esthetical textile design. In this study, a new curved surface deposition method of continuous fiber composite was proposed and a deposition path generation algorithm using the method was realized. Fabrication experiments of the proposed method were conducted by using a 6-axis vertically articulated robot with an FFF extruder. Composite materials with hemp yarn were used for creating cloth products. The fabricated objects were evaluated through accuracy tests. Through this study, we have successfully demonstrated the curved surface deposition using materials with continuous fibers.

This study used a water-soluble inclusion complex, fullerene/β-cyclodextrins(C₆₀/β-CDs), as additive abrasive with conventional SiO₂ slurry for the chemical mechanical polishing/planarization(CMP) of the silicon carbide substrate wafer. The hydrodynamic size(d_H) of C₆₀/β-CDs suspension was measured by the dynamic light scattering(DLS) method; the appearance of a C₆₀/β-CDs inclusion complex is observed by TEM. The C₆₀/β-CDs hybrid SiO₂-based slurry performed a higher removal rate than conventional SiO₂ slurry, and the polished surface showed a lower depression and roughness, too.

Racks are usually curved after cutting gear teeth. The straightening process is required to correct the machining distortion. In this study, the process of straightening a curved rack with 3-point and 4-point bending was examined to automate the correction. 3-point and 4-point bending are used for straightening. The relation between load and deformation was plotted in real time to determine the unloading point for the precise correction. The parameters of the relationship between load and deformation are important for precise correction. The load and the deflection at the center loading point are proper for 3-point bending. In the case of 4-point bending, the bending load and the bending angle should be chosen.

A more accurate and more efficient grinding method for optical glasses is demanded as high-resolution imaging devices become more popular. We propose a reaction-induced-slurry-assisted (RISA) grinding method as a chemical mechanical grinding method using cerium oxide slurry instead of ordinary coolant. In this study, the grinding performance of RISA grinding for BK7 optical glass is experimentally evaluated from the viewpoints of sub-surface damage and repeatability of ductile regime grinding at various wheel feed rates. From the grinding tests, RISA grinding causes less sub-surface damages and successfully generates ductile regime surface repeatedly under 3.0 mm/min wheel feed rate.

Machining of mold steel like STAVAX is still challenging due to significant tool wear. The ultrasonic elliptical vibration cutting (UEVC) that enables dramatic reduction of cutting force is considered as a potential solution. Tool-texturing on the rake face to reduce the friction coefficient between chips and the tool can be another solution as well. Hence, combining these two approaches may provide synergetic effect to further reduce the cutting force. In order to understand this effect, chip formation using these approaches is experimentally investigated. Chip morphology is totally different whether to use UEVC and textured tools. It was shown that the perpendicular pattern to the chip flow direction may enhance the chip-lifting effect during UEVC. Thus, upward force is applied to the workpiece, which causes reduction of thrust force.

Machining of titanium alloys has the problems of high machining costs and short tool life owing to their high specific strength and corrosion resistance. Laser-assisted machining (LAM) is a method that addresses the aforementioned issues. In this study, we proposed a LAM system that heats the workpiece before the cutting zone improve the machinability of titanium alloys. The experiments were conducted with laser power varying from 20 W to 60 W at different cutting speeds. Measurements of the tool wear of LAM revealed a 55% increase in tool life compared to that in conventional machining (CM). The proposed LAM system is a promising method for processing difficult-to-machine materials with high efficiency.

CFRP (Carbon fiber reinforced plastic) is attracting attention for weight reduction mainly in transportation equipment and thus the joining technique between CFRP and metals is strongly required. On the other hand, the bonding method between CFRP and metal has not been well optimized. The purpose of this research is to improve the adhesive strength by forming many holes on the CFRP surface before bonding. By using the anchor effect of holes, we aim to improve the adhesive strength. The results of adhesion experiments show that the strength is improved by the holes on the surface although, in some cases, the adhesive did not penetrate sufficiently and air bubbles remained in the holes.

In recent years, machine tools, industrial equipment, and measuring equipment have become finer and more accurate. On the other hand, the range of measurement/processing is expanding. Therefore, the development of accurate length measurement technology that is highly accurate and robust to the environment is required. In this study, we proposed the external cavity diode laser with the dual-periodic grating, where laser beam having two separated wavelengths are excited. Using two wavelengths, the mode number could be determined precisely. We aimed for verification experimentally.

This paper discuss changes in the wheel working surface and the wear behavior of the grain cutting edges in creep feed grinding using ceramics (Seeded gel, SG) grinding wheel. Changes in the shapes of the grain cutting edges are observed by a scanning electron micro scope (SEM) and the quantitative evaluation of the wear behavior was carried out using wear flat percentage. Grain cutting edge behavior can be divided into two types in deference grinding conditions. The first type of grain wear behavior shows a self-sharpening phenomenon based on micro fractures generated and stable changes in the attritious wear flat. Another type of grain wear behavior shows the developing attritious wear flat areas and the sharp increasing attritious wear flat with progress of grinding process. When the first type of grain cutting edge wear occurred, stable changes in grinding force components are obtained. From these results, the wear behavior of grain cutting edges in the SG creep feed grinding process is able to be quantitatively understood by using attritious wear flat percentage. In addition, the results show the grinding characteristics are closely related to the grain cutting edges wear.

A new type of recipe for route assignments is proposed to plan the operations to be solved in the no-buffer scheduling problem. A specific constraint of the scheduling problem prohibits automated guided vehicles (AGVs) passing each other on one route. The mathematical expression for the no-buffer scheduling problem is prepared in the form of mixed-integer programming. The original template of the schedules’ recipe is proposed to construct the zone control, prohibiting undesirable collisions among the AGVs. Also, computer simulations are examined to the different factory production route to verify the proposed approach.

Multi-wire EDM slicing method, which combines technologies of electrical discharge machining (EDM) and multi-wire saw, is expected as a high-quality and high-efficient slicing for Si and SiC ingot. However, in this method, the phenomena of working fluid flow have not been clarified yet, and the working fluid flow formed by high-speed wire running was investigated with high-speed camera observation and computational fluid dynamics (CFD) analysis. In the multi-wire EDM, the flow velocity in the vicinity of processing wire electrode is equivalent velocity to fluid flow formed by nozzle jet flushing. Therefore, the working fluid flow in multi-wire EDM has the sufficient performance to exclude debris from the narrow gap without nozzle jet flushing.

Maraging steels have been typically applied to precise metal mold since they have many excellent properties, such as high strength and toughness. In general, the metal mold has been finished by hand lapping, although this process takes a long time. Moreover, maraging steels are inferior to other mold steels in some surface functions. In this study, efficient surface smoothing and surface modification of maraging steel are proposed by large-area electron beam (EB) irradiation. The experimental results show that surface roughness decreases to approximately 1.0iimRz in a few minutes, and Mo-rich layer is formed in re-solidified layer of EB irradiated surface. Moreover, water repellency is improved by the EB irradiation.

Since Laser Metal Deposition (LMD) is a process that involves rapid cooling, it is known that a surface with high hardness can be obtained by using martensitic steel. On the other hand, if the process creates local tempered areas inside the material, it causes a decrease in fatigue strength. In this study, the process of forming the tempered area when cladded with martensitic steel was clarified experimentally. In the experiment, type 420 stainless steel was cladded under multiple conditions and the cross-sectional hardness distribution and microstructure were investigated.

A prototype of a biaxial positioning table with flexible support and magnetic attraction force control was developed. Because rigidity is assured and sliding friction is eliminated, the kinematic accuracy is high, and high-precision positioning is achieved. The total displacement in the long-stroke feed was 340 μm and 160 μm (X-axis and Y-axis), and the step displacement in the high-resolution feed was 85 nm and 40 nm, respectively. Experiments were conducted with cooperative positioning, in which both long-stroke and high-resolution displacements were output continuously. As a result, the displacements were almost the same as those obtained when each output was obtained independently. It was confirmed that cooperative positioning is effective.

One of main lime products is quicklime (CaO) produced by the calcination of limestone (CaCO₃). In recent years, high-quality lime products are required, and the further control of product’s specifications is necessary. However, the conventional calcination method of limestone has used a large-scale kiln, which is unsuitable for the calcination of fine granular limestone. Therefore, in this study, the calcination method of limestone by using a near-infrared laser was experimentally investigated to develop high-quality calcination process of fine granular limestone. This study revealed that the laser scanning of near-infrared CW laser can produce the area of quicklime on the surface of fine granular limestone.

Electrochemical machining is a nontraditional machining process. Both academia and industry have the consensus that it offers promising machining performance especially in terms of high surface finish, no burr, no tool wear and absence of thermally induced defects. Because of these features, no clogged layer will be formed on the porous metal material surface machined with ECM. And thus, maintaining or restoring air-permeability of porous inserts can be realized. In this research, in order to improve accuracy with maintaining the air-permeability of porous inserts, electrochemical machining (ECM) is applied, and the machining characteristics are experimentally investigated.

Dynamic-creasing characteristics of liquid-container-purpose paperboard of basis weight 313g/m² (thickness of t=0.47mm) were investigated, when varying the holding time of a flat-edge creasing knife at two levels of indentation depth d/t = 0.68 and 1.02. Effects of the holding elapsed time at the scoring process on the bending moment resistance (as the maximum peak Mp1) and the initial gradient C₁ (at folding angle for 0—5 degrees) were characterized with a logarithmic function of the holding elapsed time and the temperature of knife, and also explicit expressions of C₁, M_p1 with the permanent scored depth were revealed. It is concluded that the temperature and the holding time of creasing knife are important parameters which should be controlled in a manufacturing process of liquid package.

In compression molding of rubber and resin, there is a problem in the mold release residue of product. It is considered that the surface free energy of metal mold steel relates to the mold releasability. In general, the surface free energy is evaluated by water repellency, and it was reported that surface texturing was effective to change the water repellency on mold steels. Therefore, in this study, periodic surface nano-structures and micro-dimples were formed on the stainless steel mold surface by ultrashort pulsed laser, and the influence of the structures on water repellency was investigated. Experimental results showed that water repellency could be significantly enhanced by the formation of nano-micro hybrid structures.

This study reports the high-efficiency processing of a small diameter drill that applied high feed rate processing. An experiment was conducted to determine the influence of the drill diameter, spindle speed, and direction of processing on absorption properties of cutting oil. Processing was done in the gravitational and horizontal directions. The following two conditions were found to be necessary for the absorption of cutting oil in the processing hole and its arrival at the drill tip. The first condition was to prevent the inflow of fresh air by sealing the entrance to the processing hole with cutting oil. The second condition was to produce the consecutive long pitch formed chips and exhaust these chips form the processing hole. Future experiments will be conducted using drills with large diameters and processing will be assessed in the upward direction opposite to gravity of the processing hole.

The objective of the study is to propose a systematic method for acquiring experts’ knowledge that is to be integrated with a digital twin (DT) to construct a production system that is robust against unpredicted changes in a production environment. Especially, the paper focuses on the knowledge acquisition for the high-mix and low-volume (HMLV) production scheduling problem, because quick modification of the current schedule considering complicated constraints among processes, resources, delivery time, and so forth is regarded as a typical problem that only human experts can solve. Through a case study in the die machining industry, the paper demonstrates the validity and the limitation of the method.

We have been developing the "Smart Workcell," which supports the elderly and disabled in the high-mix, low-volume production of products and self-help devices. This study installed an electric wheelchair in a Smart Workcell and proposed a velocity-based head gesture control system that uses the face orientation acquired by a depth sensor to allow the user to change the chair posture in an ambient manner. Finally, the proposed system's effectiveness is verified by experiments, and prospects, such as speech recognition methods as a human interface for electric wheelchair are also discussed.

Effects of chisel biting property improvement and cutting force reduction in the thrust direction have been reported for ultrasonic vibration (UV)-assisted drilling. This study was conducted confirm the effectiveness of UV-assisted drilling for a workpiece. We propose a new method "suitable ultrasonic vibration-assisted drilling (SUVD)" by which the UV condition is changed appropriately at the depth position, and examine the effects of SUVD. From observation of the chisel biting behaviour, the strain circle was clarified as generated when the relative speed to the chisel and the workpiece is less than 5 m/min. Furthermore, for UV-assisted drilling, the cutting edge wear increased about 1.8 times compared with that related to conventional drilling. However, it became equivalent by the application of SUVD.

Undercooling state is metastable and immediately releasable by applying disturbance intentionally. Therefore, a 3D printer with considerably high modeling efficiency expectedly can be realized by using the supercooling phenomenon. This study discussed the applicability of the supercooling phenomenon in ice (H₂O) to additive manufacturing. As a result, freezing of the supercooling phenomenon due to impact was observed. The freezing behavior depended on the flow rate, and freezing in the syringe was observed when the flow rate was high. In addition, when the conditions such as the amount of water droplet was adjusted, it was possible to fabricate shapes with simple structures by stacking.

For future device development of graphene, the energy dissipation on micro-scale graphene circuit should be observed and analyzed. In order to obtain the temperature distribution on micro-scale graphene circuit, passive terahertz scattering near-field optical microscope (passive s-SNOM) is utilized. To confirm the size-dependence of near field signal on current stimulated graphene circuits and analyzing the energy dissipation, several types of graphene samples should be fabricated. In this paper, we created the several graphene circuits for measuring the temperature distribution by the passive s-SNOM. We checked each fabrication procedures of graphene samples and proposed the most appropriate method for further experiments.

We used a combination of pump-probe imaging method and high-speed camera to visualize the damage generation process in sapphire during ultrashort pulse laser processing. As a result, we found that the damage was generated by stress waves propagating through the material, and that the mode of stress wave generation changed as the number of irradiation pulses increased. The mechanism of damage generation during processing observed in this study will contribute to the development of precision processing methods for sapphire.

Polychlorotrifluoroethylene resin is widely used in many fields due to its excellent characteristics, and good surface finish is very important for its application. In this study, the finishing effect of the magnetic abrasive finishing process using an alternating magnetic field on polychlorotrifluoroethylene resin was discussed. According to the experimental results, the surface roughness of the workpiece can be improved from 112.83 nm to 5 nm within 15 minutes.

Demand for fabricating microstructures on a workpiece surface has increased in recent years. A fast tool servo technology has been proposed as one of the technologies for fabricating fine patterns with high efficiency. This study has focused on milling process using a fast tool servo with a giant magnetostrictive element as an actuator. This paper describes the performance evaluation of the system by machining experiments of fine patterns. The results confirmed that fine patterns can be fabricated on a 3D surface by using the developed fast tool servo system.

5-axis machine tools have the problem of singular point derived from their inverse kinematics. When a tool trajectory passes through the vicinity of the singular point, an abrupt movement of the rotational axis occurs, which the drive system cannot follow a command trajectory. This leads to the need to decrease the feed rate, which elongates the cycle time. This paper proposes a method to avoid singular point using cubic spline and circular arc, which realizes low angular acceleration and short cycle time. The simulation and experimental results verify the effectiveness of the proposed method.

Chatter vibration is the most problem in machining. At present, chatter vibration is avoided by changing the cutting conditions so that chatter vibration does not occur based on the stability limit diagram. However, changing the cutting conditions may lead to a decrease in productivity. The stability limit is estimated from the relationship between dynamic characteristics of machine tool and the cutting conditions. Therefore, we propose the method for avoiding the chatter vibration by changing the machine tool rigidity. In this report, we report the transition of dynamic characteristics and stability limit diagram due to the change in the rigidity of the machine, and the confirmation of the presence or absence of chatter vibration by the machining test.

In order to further reduce the demolding resistance when a molded product is released from the core mold in plastic injection molding, we developed a breathable mold in which a porous part was inserted in the core mold. By pushing compressed air through the porous insert from the inside of the core mold during the release process of the molded product, the local load during demolding was reduced. The effect of reducing the demolding resistance was verified when the ventilation direction of the compressed air was different between the extraction direction of the molded product (end face breathable) and the direction perpendicular to the extraction direction of the molded product (side breathable).

This paper is concerned with performing job shop scheduling considering discrete uncertainty based on proactive scheduling approach. This research deals with production in which an intermediate product needs to undergo a reworking or a reprocessing depending on result of inspection. For this type of production, we developed the following method: (i) a set of consistent schedules each of which corresponds to a production scenario determined by an inspection result is generated by using genetic algorithm so that a weighted sum of makespan, overtime work and tardiness is minimized; (ii) the production starts based on the initial schedule that corresponds to the scenario in which no reworkings/reprocessings occur, and then the schedule is switched by the one which corresponds to the new scenario each time when it turned out that a reworking/reprocessing needs to be performed. Comparison to reactive scheduling approach using numerical examples showed effectiveness of the proposed method.

The purpose of this study is to estimate the thermal deformations of a CNC lathe based on the temperature rise measured at several lathe parts. In this study, the temperature rise at several points of the lathe and the variation in the distance between the tool and the workpiece obtained by workpiece diameter measurements were determined through turning tests. Based on the obtained results, the thermal deformation between the workpiece and the tool during the turning cycle was estimated using a linear polynomial function that included the coefficients and measured temperature rise. It was confirmed that the proposed method could successfully estimate the thermal deformation of the lathe during the turning operation.

Many researchers are studying reconfigurable manufacturing systems (RMSs) as highly efficient manufacturing systems that can effectively utilize production resources, even when large demand fluctuations occur. However, there have been relatively few studies focusing on machinery, which is an important component of realizing RMS in assembly manufacturing companies. In a previous study, we proposed a type of modular structured machinery (MSM) that can be applied to RMS for assembly applications. However, this proposal was limited to examination from a mechanical perspective. In this study, we propose a novel MSM concept that integrates mechanical and software aspects and demonstrate its applicability to RMS.

To implement the cutting and surface modification in one machining process, we proposed a surface modification technique with short pulse laser of small size that could be easily mounted onto cutting machining. With the laser irradiation and cutting oil as the carbon source, a hard-carbonaceous layer formed on the metal workpiece is expected. Herein, a titanium alloy disk in PAO was irradiated by a pico-second laser. Results showed that the hardness of irradiated area significantly increased, the formation of titanium carbide was confirmed with XRD. In the reciprocating friction test, the irradiation part showed improved wear resistance and lower friction with the increase of laser pulses.

The powder bed fusion method of Metal additive manufacturing, Support materials are often required for modeling. However, this support material has a problem in terms of removal. Currently, this support material is removed by processing such as cutting. It will lead to the development of the industry if it can be removed by simple processing without taking time and cost by cutting. Therefore, we research on a support structure that works as a support material during modeling and can be easily removed after building. In this experiment, we performed bending and tensile tests for separation. In addition, a theoretical consideration of the support dimensions to enable separation was performed.

IoT is widely applied in the modern manufacturing system to acquire the time-series data from each individual equipment. Based on such time-series data, a variety of anomaly detection methods have been proposed for improvement in safety and productivity. However, conventional methods have some problems such as insufficient supervised anomaly data and need of extra procedure of feature extraction. As a solution, we developed a machine-learning based anomaly detection model which combines AE (Autoencoder) with LOF (Local Outlier Factor) in a simple way. This model requires the normal data only for AE at the training phase, to extract the features from the raw time-series data. At the detection phase, LOF is applied to calculate the deviation of input data in feature space. The model has been verified by use of the phase-shifted sine waves generated artificially. As a result, we conclude our model can discern the normal data from anomalies.

The purpose of this study is to fabricate a Fabry-Perot interferometer to measure the distance between two planes and to measure the amount of correction to produce a highly accurate gauge. In this paper, we propose to use the resonance wavelength of the far mode number to calculate the distance, and evaluate it by measurements using an infrared laser. The effect of temperature change on the resonance wavelength and the measurement distance is also discussed.

Directed energy deposition (DED) is one of additive manufacturing processes attracting attention from various industries. Foam metal is a material having beneficial characteristics, but is difficult to produce with conventional manufacturing system. This study proposes a simple foam metal fabrication method by applying DED. The proposed method produces foam stainless alloy in DED by adding a foaming agent, titanium hydride (TiH2), into the powder material. This study evaluates the foaming behavior of porous stainless in DED by changing the particle size of TiH2 and the number of layers per line, and obtains the optimal number of layers to improve the porosity dispersion.