Smooth and flat surface of glass plates should be needed for the HDD substrate. Polishing with free abrasives made smooth surface, however it is difficult to obtain flat surface because of the non-uniform distribution of free abrasives. In order to overcome such issue, we tried to apply magnetic force with magnetic fluid and magnetic field for uniform distribution of abrasives during polishing process. By applying 20mT of normal magnetic filed to the Copper polishing plate with magnetic fluid as polishing liquid, surface roughness of polished glass plate improved by 20-60 %. And flatness of polished glass decreased to half with magnetic fluid and magnetic filed.

View full abstract

Recently, the demand for electronic device, such as personal computer, increases rapidly. Therefore, polishing pad for achieving high removal rate has been strongly required in mass production of semiconductor and hard disk. Moreover, it is required to polish fragile material, such as low-k material, without damage. So, in order to meet these requirements, that is to polish in the low or high pressure and speed conditions, a structure-controlled polishing pad is developed. And, in previous report, high removal rate was achieved in high pressure condition by improved the surface condition of developed pad. In this study, the influence of contact condition between polishing pad and workpiece, which changes with relative speed between polishing pad and workpiece, is considered for evaluation of friction coefficient and removal rate. Then, the developed pad achieved high removal rate in wide range of pad rotational speed condition by improving the surface condition.

View full abstract

Author have been developed a novel polishing method using functional fluids which are dispersed abrasives with silicone oil. This fluid shows active reciprocate motion between electrodes under AC electric field at very low frequency. We have proposed new method of polishing for glasses, small seize end mill tool. And we have obtained novel method for glass polishing using the water with CeO2 abrasives with water under AC electric field.

View full abstract

The single-crystal SiC is capturing the spotlight as a substrate for next-generation power devices. In specula surface polish processing, single-crystal SiC needs very long processing time. In order to reduce processing cost, the high promotion of efficiency of specula surface polishing processing serves as an important point. In this research, the possibility of the high efficiency polishing by the combination of a grain and an oxidizer was explored. It became clear that the polish efficiency whose combination of the ceria abrasive-grain and an oxidizer is very high was demonstrated as a result.

View full abstract

This paper proposes a method for calibrating the geometric deviations inherent to turning centers with a swivel tool-spindle head. The number of geometric deviations of the turning centers is more than that of the tilting rotary table type machining centers. Therefore, six measurements by means of a telescoping ball bar are required in order to determine the inherent deviations. Simultaneous three axis motions are employed to measure the circular trajectories, and six sets of the eccentricities of the measured trajectories are taken and then the geometric deviations are calculated. Some geometric deviations measured are corrected by an NC program experimentally to confirm the effectiveness of the proposed method. It is found from the experimental results that the trajectories of the interpolation motions are considerably improved.

View full abstract

In order to manufacture ultra-precision components with complex 3D geometries, a precise indexing head for tilting tools or workpieces on the vertical plane is indispensable. However, it is difficult to achieve adequate indexing accuracy on the vertical plane due to its eccentric load. In this study, we proposed a high-torque and high-accuracy hybrid actuator system which combines two different type actuators as an oscillating pneumatic rotary actuator and a voice coil motor. These two actuators are arranged in parallel, and they drive common rotary axis of a controlled object simultaneously so as to complement their each characteristic. We achieve both high-torque and high-accuracy indexing using the proposed hybrid-actuator system.

View full abstract

In this paper, a servo-clinometer developed to measure the angular positioning accuracy of the tilting axis of five-axis machining centers with a tilting rotary table is introduced. There are no proper instruments to measure the angular deviations of the tilting axis whose center line is lower than the top surface of the rotary table. Thus, the servo-clinometer consisting of rotary encoder, pendulum with electronic level and servo motor was developed. Through the experiment, it is confirmed that the developed instrument is enough to measure the angular deviations. The developed instrument could be applied to the horizontal plane, but it was not able to measure on the inclined plane such as multi-tasking turning centers with a milling spindle.

View full abstract

Spindle vibration of machine tools causes premature tool wear and deterioration of machining accuracy. Therefore, it is required to realize a real-time balancing mechanism for achieving high accuracy and efficiency machining. In this study, in order to reduce unbalance response of machine tool spindles, a smart spindle with .a real-time balancing mechanism using magnetic fluid is proposed. The magnetic fluid is enclosed inside the spindle, and the distribution of the circumferential mass of magnetic fluid is actively controlled. By applying the proposed balancing mechanism, a machine tool spindle is developed and the feasibility of the balancing mechanism is proved. In this report, chatter vibration avoidance by using the machine tool spindle with the balancing mechanism is studied. Chatter vibration of cutting process is modeled and forcibly generated disturbance is simulated. The disturbance is assumed that the balancing mechanism generates by controlling the distribution of the circumferential mass of magnetic fluid.

View full abstract

These days, machine parts are fabricated in micro scale. The influence of the relative vibration between a tool and a work-piece on machining accuracy is unignorable. There are two causes for the relative vibration. One is the floor oscillation disturbance introduced from the floor. The other is the machine's own oscillation disturbance arisen from the motion of a table and a tool. In this paper, the subject is a ball-screw-driven 3-axis micro-milling machine. How whether the passive vibration isolation system using compressed air is available or not influences on the relative vibration between a tool and a work-piece is investigated. By using a vibration isolation system, the floor oscillation disturbance was isolated, and the base vibration caused by the machine's own oscillation disturbance was isolated. However the internal vibration was excited.

View full abstract

In machining of difficult-to-cut materials with end mill, chatter vibration is serious problem, because it causes poor surface finish and short tool life and cutting conditions must be reduced so that chatter vibration does not arise. So far many kinds of geometries such as variable pitch or variable helix angle have been developed to prevent end mills from chattering. However the performance is not sufficient to realize stable milling in high efficiency conditions. The Author analyzed regenerative vibration in milling and developed variable helix endmill, which has stability in wide range of rotational speed. This paper presents experimental results of the end mill in comparison with conventional one and variable pitch one and shows that variable helix is most effective to suppress chatter vibration.

View full abstract

This research presents the results of a series of tests performed in order to show the most suitable drill characteristics to drill deep holes. The drill's flute geometry and the cutting edge chamfer are factors that influence the chip evacuation when drilling thus by changing these parameters it was possible to find the best characteristics to successfully drill deep holes. A low cutting edge chamfer that helps to reduce the cutting resistance, a flute form with a small curl shape combined with a low flute surface roughness and a reverse web taper were the ideal conditions that allowed the smooth chip evacuation. In addition it was learned that in order to maintain hole diameters within micrometer allowance, a guide hole is needed.

View full abstract

CBN cutting tool is used for finish cutting of hardened steel widely. The chips expand and twist around the work or holder even though finish turning of hardened steels same with normal turning. And it induces unexpected stop of turning process and deterioration of surface roughness. At this paper, we tried to form the chip breaker on the top face of CBN segment in order to solve this problem. We analyzed the flow of chips, and optimized the angle of breaker wall and distance from cutting point to breaker wall. It was found that the round type wall can achieve constant breaker effect at various finish cutting oondition.

View full abstract

Newly developed coated cBN sintered tool has succeeded in showing excellent breakage resistance and high wear resistance compared with conventional cBN sintered tool in high efficiency machining and interrupted cutting. This tool can be widely applied for the finish machining of hardened steels, interrupted cutting, and so on, which were thought to be difficult to be cut before.

View full abstract

The application of exotic material like titanium alloy and heat resistant super alloy is increasing more and more, especially in aircraft industry. Such exotic material is difficult to machine, because of their good mechanical properties, and high temperature during machining. Newly developed PVD (Physical Vapor Deposition) coating is super-multi layered coating with ultra-thin (nanometer) layers of TiAlN and AlCrN, which are altemately stacked up to approximately 1,000 layers. Its hardness is improved 40% higher, and oxidization temperature is 200℃ increased as compared with conventional TiAlN coating. Therefore TiAlN/AlCrN super multi-layer coating shows superior wear and thermal resistance in exotic material machining, it is quite possible to get longer tool life and higher productivity.

View full abstract

The cutter arbor with BT shank and the cutter head are separated from the conventional mono block style cutter with BT shank. The connection interface between arbor and cutter head are equivalent to the DEPO style popular in Europe. The cutter arbor has the dampening mechanism built-in the BT shank and the machine spindle interface is double face contact of taper and flange.

View full abstract

The values of run-out, the stiffhess, gripping torque, and balance, are often used as the performance evaluation of tool-holders. The superiority or inferiority of the tool-holder is often distinguished based on those values. However, the validity of these values and the experiment based on them are little, and the relation to the cutting is is not still clarified. In this paper, the cutting performance of two kinds of tool holders with different performance;run-out, stiffness, gripping torque, were compared and verified. The profiles of each hole drilled were measured, and the superiority or inferiority of the tool holder was distinguished based on those measurements. To improve the validity of this technique, a wide cutting condition was intentionally applied. Moreover, an easy distinction became possible because of measurements expressed by using a contour line chart.

View full abstract

Since the collet deforms elastically with chucking, the accuracy of the collet-chuck is not always constant even if it is same chuck and collet. Therefore, in this study, the influence on the chucking accuracy of the setting orientation of the collet to chuck is clarified, and then, the improvement method of the accuracy is proposed based on it. From the experimental result, it is found that there is the specific orientation of the collet to make the accuracy the best. Furthermore, the geometrical analysis makes clear that the chucking error is generated with resultant of inherent geometrical errors of the chuck and collet. Based on the geometrical relationship, it is confirmed that marking the orientation of the chuck and collet for optimal setting makes the chucking accuracy the best.

View full abstract

For a collet chuck, the tightening condition of a nut greatly influences the tool chucking characteristics. Therefore, the management of the tightening of a nut is important to use collet chucks properly, and then, a torque wrench is often used. However, even if the value of the wrench is the same, the actual tightening force is not necessarily same since it is influenced by lubrication, etc. In this study, the test tool built in strain sensor system is designed to measure the tool chucking torque. Furthermore, the rational management method of the tightening process of collet chucks is examined experimentally. As a result, the following have been made clear. The chucking torque can be determined based on the strain generated on the inside surface of the test tool. With this measuring system, it is confirmed that the chucking torque is in proportion to the tightening torque of a nut. Therefore, the chucking torque is able to control with the calibration result based on the relationship between the chucking and the tightening torques. However, the tool chucking torque is greatly different depending on the lubrication condition of the nut. Therefore, it is necessary to determine the relationship between the tightening and the chucking torques including the influence of lubrication condition.

View full abstract

This paper describes the new 5-axis horizontal machining center "MAG1" with advanced fixture technology for Aluminum machining. There are several points in this concept. (1) Increase productivity. (2) Reduce the number of work set up (3) Cut down lead time. (4) Automation.

View full abstract

The 5-axis control machines are machine tools which have three (3) linear axes and two (2) rotary axes. They are used for machining the value added products with a complicated posture with superior characteristics in strength, anticorrosion and anti-heat features. For the NC Milling Head of a 5-axis control machine, high-speed and highly accurate positioning for the main spindle are required due to the trend of increasing speed of linear axes. Tsudakoma created the structure which enabled displacement-free positioning of the edge of a tool blade in case of A-axis clamping, and it developed the NC Milling Head of high speed, smooth movement and superior control characteristics. The NC Milling Head employs a direct drive motor which has highly accurate contouring control because of its backlash-free feature.

View full abstract

To achieve the nanometer level running accuracy by Linear Motion Ball Guide, the fluctuation caused by the circulation of balls must be eliminated possibly. Therefore, authors felt strongly that to find out the reason of the fluctuation and to act against that guides us to develop the Linear Motion Ball Guide which realize the nanometer level running accuracy and new type of Linear Motion Ball Guide was developed. With new type of Linear Motion Ball Guide, fluctuation accuracy of 0.025 μm was obtained experimentally as a component and 0.008 μm as a system. This new Linear Motion Ball Guide upset conventional wisdom.

View full abstract

This paper reports on a compact, 5-degrees-of-freedom (5-DOF) controlled maglev local actuator for realizing high speed electrical discharge machining (EDM), employing a novel power supply mechanism to feed a discharge current to an electrode attached to a spindle, and to transmit a torque from a motor to the spindle. The spindle is supported by a 5-DOF controlled magnetic bearing and is rotated by following the rotation of a power supply ring, utilizing a magnetic coupling. Flexible wires between the power supply ring and the spindle feed the discharge current to the electrode, without transmitting disturbing forces, so that the spindle is free from the direct contact with brushes, used to feed the discharge current. Experimental results show a prototype maglev actuator possesses a positioning resolution of a few microns and several ten micro-radians, bandwidths greater than 100 Hz in the 5-DOF directions, and a positioning stroke of 2mm in the thrust direction. Moreover, the discharge current can be fed to the electrode attached to the spindle, rotating at 2,000min^<-1>.

View full abstract

Glass substrate for various display device and semiconductor wafer gets larger, it becomes more fragile. Conventional transportation system damages the substrate by contact stress. In order to solve these problems, a new non-contact transportation technology is proposed. The substrate is levitated by aerostatic force and transported by the acoustic viscous force excited by traveling flexure deformation of stator. In this paper, non-contact guide unit to avoid derailment of the substrate is constructed. The guide units and stator are arranged alternately along the transportation road. The stable condjtion was obtained as the edge of the substrate coincided with the nodal line of oscillating plate of guide unit. The non-contact holding force was 20mN by using one guide unit.

View full abstract

In the feed drive system consisting of a cylindrical linear motor and linear ball guides, the friction force caused in linear ball guides greatly influences the behavior of the feed drive system. In this study, the influence of friction characteristics on the behavior of various motions was clarified from both sides of experimental results and simulation by using a mathematical model of non-linear spring characteristic and relationship between velocity and friction force under micro-scopic motion. As the result, the proposed model can express the actual behaviors accurately. Then, to clarify the relation between the vibration damping behavior to non-linear spring characteristic, non-linear spring characteristic was changed from proposed model and was compared with the logarithmic decrement. As the result, it has been understood to show the logarithmic decrement in not only non-linear spring characteristic but also amplitude of vibration.

View full abstract

In actual aerostatic spindles, it is very difficult to manufacture the squareness of a thrust collar within the accuracy of 1 μm. Furthermore, it is naturally considered that the squareness of the thrust collar affects the rotational accuracy of the aerostatic spindle. Therefore, this paper numerically investigates the rotational accuracy of an aerostatic spindle when the squareness of a thrust collar is varied. At very low speeds, the rotational accuracy is obtained by solving the Reynolds equation taking into account the squareness of the thrust bearing. At speeds, the spindle locus is obtained by Non-Linear Orbit Method, where the Reynolds equation and the motion of equation of a spindle were simultaneously solved. It is found that the squareness of the thrust collar greatly affects the rotational accuracy of the spindle.

View full abstract

Recently, aerostatic thrust bearings have been widely applied to precision devices because of their excellent accuracy of motion. However, it is said that aerostatic bearings are prone to cause nanometer order of vibration due to low viscosity of air. Therefore, in order to achieve sub-nanometer order of accuracy in precision devices, bearings with larger damping coefficient is required to suppress very small vibration. In this paper, a water lubricated porous thrust bearing is proposed as a precision bearing with larger damping coefficient The static and dynamic characteristics of water lubricated porous thrust bearings were investigated numerically and experimentally. The usefulness of the proposed thrust bearing was confirmed.

View full abstract

A linear-motor-driven table system equipped with hydrostatic water bearings is developed. The table system is equipped with one-side-recess-type bearings and the slide table is preloaded by an atiractive force of linear-motor magnet The sustaining force and static stifihess of the table is affected by flow rate of water and load on the table. The fundamental performance of the system is experimentally investigated and the detected data are compared with theoretical values. As the result, the measured sustaining force and static stilThess is smaller than theoretical values. The reason of this is the leakage of water from the bearing surfaces. In consideration of the additional clearance due to the leakage, the measured values approximately correspond to the theoretical ones.

View full abstract

Cutting force monitoring technology is important to realize autonomic and intelligent manufacturing system. However, installing a force sensor to a machine tool table is generally needed to measure cutting forces. In this study, sensor-less cutting force monitoring method applying dual disturbance observer to table control system is proposed. Theoretically, this method can realize both robust control and cutting force monitoring. Its validity is verified numerically and experimentally using a linear motor driving table.

View full abstract

Determination of machining condition and generation of machining data are hard jobs for inexperienced operators. The objective of this study is the development of operation planning support system that consists of some software modules to generate machining data without experience.In this report, the standardization of machining information used in the operation planning support system and .the development of tool path generation module for 5-axis controlled machining are proposed. The software modules installed in the developed system refer to machining information database automatically. As a result, it is shown that the system enables sequential operations of making 5-axis controlled machining data only by inputting the bare minimum of information. Finally, we compared the developed system to commercial CAM software, and the effect on the laborsaving in operation planning is actually confirmed.

View full abstract

In multiaxis controlled machining, the performance of the machined workpiece is influenced by the selection of the controlled axes. In the present paper, we demonstrated the finishing machining of the die steel. Through the comparison of the form accuracy of workpiece machined with the paths of the different selection of the control axes, we evaluated the effectiveness of the machining using the rotational axis.

View full abstract

Electricity and electronic equipment that uses the portable terminal are rapidly widespread to a general society of miniaturizing, making to high performance, and the diversification, and have evolved to making to the multifunction in recent years. Along with it, excellent AFRP printed wiring board in laser beam machining has come to be used. And the necessity of the router processing to the printed wiring board increases rapidly by an excellent aramid fiber strengthening. However, the example of the report of research concerning the router processing to the AFRP printed wiring board is very few at the present stage. Then, it paid attention to shagginess as a quality evaluation on the processing side of the exteriials router processing in the AFRP printed wiring board in this research. As a result of the experiment, it proposes a new processing method.

View full abstract

Freeform surface is widely used in CAD and other engineering applications to describe the surface of 3D objects. Generally multi-axis machine tools are used for the manufacturing of those products with complex shapes. In this research, the main aim is to analyze the characteristics of the freeform surface, and to extract the feature areas of the freeform surface. These feature information may be used in CAM programming, to generate more efficient tool paths, and to improve the efficiency for freeform surface machining. In mesh simplification researches, one of the main goals is to find out the feature elements, and to keep these features with the models is being simplified. In this paper, feature line segments detection and Gaussian curvature analysis of freeform surface are presented, and the discussions about the experimental results are addressed.

View full abstract

This paper deals with a multi-agent architecture of an integrated and dynamic system for process planning and scheduling for multi jobs. A negotiation protocol is discussed, in this paper, to generate the process plans and the schedules of the manufacturing resources and the individual jobs, dynamically and incrementally, based on the alternative manufacturing processes. The alternative manufacturing processes are presented by the process plan networks discussed in the previous paper, and the suitable process plans and schedules are searched and generated to cope with both the dynamic status and the disturbances of the manufacturing systems.

View full abstract

We developed a new feeder setup planning algorithm for a gantry-type placement machine to increase productivity of printed circuit board (PCB) assembly. It is based on offline setup strategy which exploits a cart swapping mechanism of the placement machine. The proposed algorithm is examined by real-life PCB data. It is shown that the productivity by the offline setup strategy is better than that of group setup strategy and our algorithm achieves significant improvement in productivity.

View full abstract

To improve the commodity performance as the micro processing technology in recent years develops, 3D-Coordinate-Mesuring Machine of high accuracy is needed. There are a method of detecting the transformation in the blade spring that supports the probe by combining the laser and PSD etc. as a detector of the high accuracy used now. However, needs of the measurement with high accuracy rise, too and the development of a new technique is demanded. In this research, for the primary stage, using strain-gage is examined for the accuracy improvement of the touch-Probe.

View full abstract

In order to measure the 3D shape of microcomponents, a novel nano-CMM system has been developed based on an oscillated probing technique, which uses an optically trapped particle. The trapped particle is laterally oscillated at the focal plane of the objective. The frequency response of the oscillated particle disagrees with the theoretical curve of the spring-mass-damper model at high frequency range. It is considered the difference is caused from the numerical error for the fluid effect, which is given by the stokes formula 6rir. In this report, we construct a fluid simulation using SMAC method that calculates fluid resistance against an oscillating sphere in noninertial frame of reference. The fluid effect is investigated in order to improve the model of the sphere motion.

View full abstract

A precision shape measurement system on SPDT machine tool is built based on error compensation for obtaining the better machining accuracy of large aspheric optics. A series of errors of machining and machine tool were compensated with a specially made straightness gauge. Measurement reference start point is decided accurately by a new approach algorithm at the intersection of two aspheric surfaces. As the result, an electroless nickel coated aspheric optic was machined based on this system, the geometric shape error was decreased to less than ± 120 nm from a few microns in 200 mm mirror range.

View full abstract

Deflection due to gravity exerts a great influence on the measurement accuracy of the three-point-support inverting method which can measure the warp and thickness of large flat panels simultaneously. Especially when the panels are made of monocrystalline materials like silicon wafers, the influence of the anisotropy of the elastic modulus on the deflection should be taken into consideration. The deflection due to gravity depends on the crystal orientation relative to the three-point-supports. Thus the deviation of actual crystal orientation from the direction indicated by notch causes a measurement error. Rotation of crystal orientation relative to the three-point-supports can prevent the wafer vibration excited by disturbance vibration because resonance frequency of the wafer can be changed.

View full abstract

A novel surface measurement system has been developped in order to evaluate the process of fabricating micro lenses. White light interferometer is conventionally applied for the flat surface and sphreical surface of lens mold. However it is difficult to evaluate the non-spherical lens mold by using the white light interferometer. We propose light scattering method which applied the extended TIS model in order to evaluate a surface texture of a non-spherical microlens mold. In this report we describe the experiment result wihtch measure the surface roughness of flat Si wafer coated with Cu. The developed system can detect scattered light pattern from the surface, and the roughness is agreed with theoritical model of TIS.

View full abstract

The Makyoh, translated as "magic mirror," is a bronze mirror originating from ancient Japan. The Makyoh reflects an image on a distant wall when parallel light such as sunlight shines on it, and it has been produced by craftsmen with a great amount of cumulative experience and intuition. The diminishing number of craftsmen that can create the Makyoh has become a problem. We attempted the digital manufacturing of a Makyoh using NC machining and polishing. To determine the best machining method, we examined Makyoh images to identify the relationship between convex shapes developed in thin-wall parts of the mirror and the thrust force needed to stabilize the line contrast. As a result, it was confirmed that a Makyoh surface can be created using NC machining and polishing.

View full abstract

A workpiece descent type of multi-wire saw is one of methods used to slice the large sized silicon ingots. This slicing method uses the cutting fluid mixed abrasive grains called slurry. This slurry is supplied to a wire tool and carried into the processing area. Therefore, the slurry composition or the actions of slurry affect the processing characteristics. In this paper, the slurry actions in the slicing groove are observed by a high-speed video camera. As the results, this report makes the relationship between slurry actions in the sliced grooves and workpiece shape at the workpiece descent type of multi-wire saw clear.

View full abstract

We attempted to grind hardened steel to a mirror-like surface finish with high efficiency using an ultra-high speed grinding process. We examined the effects of the work speed and the grinding wheel grain size in an effort to optimize the grinding conditions for accomplishing mirror-like surface grinding with high efficiency. Furthermore, it was found that workpiece degradation due to heat generation was suppressed when the work speed was increased instead of reducing the depth of cut.

View full abstract

High quality gears are required to reduce gear noise and vibration in transmissions. The gear manufacturers need the efficient gear finishing method after the heat treatment to make high quality gears. This paper presents Mitsubishi gear grinder ZE15A via the continuous generating method with the multi-threaded grinding wheel. This machine is designed for mass production such as automobile transmission gears. The grinding example shows the gear ground by ZE15A is JIS class 3 and the grinding cost is low to introduce gear grinding process in production lines.

View full abstract

This research aims to observe the behaviors of abrasive grains in contacting areas with workpieces. In order to observe the behaviors of abrasive grains, a loading apparatus for grinding wheel which can be inserted into SEM was developed. As the experimental results, behaviors of abrasive grains of loaded grinding stone can be observed directly. And observed results have been evaluated by comparing with analyzed results by FEM method with a mathematical model previously proposed.

View full abstract

In this study, to monitor the grinding force without any dynamometer, the new monitoring index calculated from the rotational speed of the grinding wheel are proposed and compared to the previous monitoring index. The previous is calculated by Speed Difference Square Method and shows very strong correlation with the tangential grinding force. The new index is calculated by the method derived from viscous friction. This paper shows strong correlation between the new index and the tangential grinding force, as well as the previous index.

View full abstract

The purpose of this study is the development of in-process measurement technique of surface roughness in grinding using the thermoelectric effect. In the proposed measurement, the electromotive force generates depending on the surface roughness of workpiece when the sensor with separate thermocouple wires rubs on the workpiece surface. In this report, the sensor was improved by adjustment of measurement point and attaching the elastic support pad. As a result, the in-process measurement of surface roughness can be carried out quantitatively with high stability.

View full abstract

In our previous study, a new centerless grinding method using surface grinder was proposed. This paper describes the effects of process parameters on the machining accuracy. A grinding model is considered at first for simulation analysis of workpiece rounding process in tangential-feed centerless grinding operations. Then, simulation analysis is carried out to predict the variation of workpiece roundness and to discover how the process parameters affect the roundness. Finally actual grinding operations are performed for the confirmation of the simulation results. The results indicated that the smaller worktable feed rate and higher workpiece rotational speed or smaller grinding allowance give the better roundness.

View full abstract

For finish the aspherical lens die and mold of glass mold, a newly type disk top rotation/revolution type polishing machine had developed. In this paper, rotation/revolution type polishing method, concept and the specification of developed machine will been described. And some fundamental polishing experiment also discussed.

View full abstract