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DOI： 10.11305/jjsip.14.1_1_71

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Language：Japanese   Publisher：Japan Society for Intellectual Production  

A change of the number of patent applications is investigated in order to estimate activity of research and development of companies in each prefecture. The number of patent applications in most prefectures tends to decrease through these thirteen years (2000-2012). Most prefectures of North Tohoku, San-in, Shikoku and Kyushu district have smaller number of the patent applications. The Universities located in these prefectures have smaller number of cooperative researches between a university and a company. This result suggests that activity of research and development of not only a company but also the whole area including a university are weak in these regions. From the viewpoint of creation of the local innovation, it is supposed that an innovation power is weak particularly in these regions. It will be thought that some policy measures depending on the local situation are necessary in the future.<br>

DOI： 10.11305/jjsip.10.2_32

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In this study, the grinding mechanism of the crankshaft pin carried out by the CNC crankshaft pin grinder, is theoretically analyzed. By this grinder in the grinding process, the geometrical interference form varies continuously, because the substantial grinding speed at the grinding point changes due to the revolution of the pin. Therefore, the grinding mechanism in the CNC camshaft pin grinder is made clear, from the investigation of the various relation of the speed at the grinding point. Furthermore, the control methods of the constant grinding velocity ratio and of the constant residual stock are proposed in order to regulate the variations of the grinding results. In these methods, the journal rotation angle velocity is controlled to maintain the size of the geometrical chip shape constant, and the high performance pin grinding ability is verified.

DOI： 10.1299/jsmemecjo.2004.4.0_289

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：The Japan Society of Mechanical Engineers  

In contour grinding, grinding force varies in a complex way, because the curvature radius of a workpiece varies and the real depth of cut is also influenced by the thermal deformation of a machine structure. Since low stiffness tools are generally used in contour grinding, the fluctuation of a grinding force results in a lower machining accuracy. In this study, therefore, in order to establish the high precision contour grinding method, the reference position correct sensor is developed to compensate the thermal deformation of a machine structure, and the controlled normal force grinding technique is proposed to restrain the fluctuation of a normal grinding force. High performance contour grinding method, with which both constant surface roughness and high dimensional accuracy can be obtained in any curvature radius of a workpiece, is developed by using the controlled normal force grinding method with the reference position correct sensor.

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society for Precision Engineering  

In order to establish the high precision contour grinding method, the reference position correct sensor is first developed for compensating the thermal deformation of a machine structure, and then the controlled normal force grinding method is developed to control a fluctuation ofa normal grinding force. Main conclusions obtained in this study are as follows : (1) It is made possible to correct the error of wheel depth of cut accurately, with using developed reference position correct sensor. (2) The controlled normal force grinding technique is developed, through the analysis of the feed rate setting conditions correspond to the curvature variation of a workpiece. (3) High performance contour grinding method, with which both constant surface roughness and high dimensional accuracy can be obtained in any curvature radius of a workpiece, is developed by using the controlled normal force grinding method incorporate the reference position correct sensor.

DOI： 10.2493/jjspe.67.581

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Other Link： https://jlc.jst.go.jp/DN/JALC/00073175780?from=CiNii

Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Institute of Marine Engineering  

The partial contacting wear test of spray coated ceramics was carried out by using pin-on-disk type wear testing machine. The test results of spray coated ceramics with no treatment were compared with that of Ni-P + PTFE plated spray coated ceramics. And observation of wear surface was carried out using together some methods of observation in order to analyze the wear surface in initial break-in condition quantitatively.<BR>The main results are in the following : Spray coated ceramics was worn abnormally after partial contacting wear test, but Ni-P + PTFE plated spray coated ceramics was worn normally, protecting from the damage by partial contacting. Phenomenon of surface break-in condition can be evaluated quantitatively by statistical treatment of wear surface profile.

DOI： 10.5988/jime1966.32.904

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DOI： 10.2493/jjspe.53.1271

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

File： 20220309120145936_ja_5p_（完成版）.docx

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File： 213015fujiwara.pdf

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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J-GLOBAL

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DOI： 10.11305/jjsip.12.1_1_33

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DOI： 10.11420/jsat.54.494

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Language：English   Publisher：PROFESSIONAL ENGINEERING PUBLISHING LTD  

Grinding is one of the machining methods for finishing that is performed by using a large number of abrasive grains with irregular shapes and random distribution. While this feature enables accurate and high-quality machining, it complicates analysis of the grinding process. To solve this problem, a great number of computer simulations have been carried out using the Monte Carlo method. Most of them, however, statically calculate geometric interaction between a grain and a workpiece, and have not provided enough achievements for practical applications. In this study, taking this background into account, a simulation program has been developed based on the elastic support model of a grain in which the elasticity of grain support changes according to its location. The program focuses on the generation process of a workpiece surface, and simulates the interaction between grains and a workpiece, which includes the elastic and plastic deformation as well as the removal of workpiece material. Examples of the simulation shown in this study verify the fact that the simulation program facilitates analysis of the microscopic grinding phenomena, and can be used as a practical tool for predicting the grinding results and for optimizing grinding parameters.

DOI： 10.1243/09544054JEM1032

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DOI： 10.11305/jjsip.5.1_17

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DOI： 10.1299/kikaic.73.2350

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Language：English   Publisher：TAYLOR & FRANCIS INC  

A good part of grinding operations is still dependent on skilled operators. Against such a background, this study takes up cylindrical plunge grinding, and presents a skill-formation model based on the learning process similar to that in which a grinding operator acquires skills through trial and error. The model repeats learning by giving only the total grinding stock and initial infeed rate, changing infeed rate, and evaluating the size and the removal rate in the process end. The simulation result has proved that the model shows a skill-formation process similar to that of an operator and generates desirable infeed processes.

DOI： 10.1080/10910340600998429

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Language：English   Publisher：Elsevier Ltd  

Grinding is one of the machining methods for finishing that is performed by using a large number of abrasive grains with irregular shapes and random distribution. While this feature enables accurate and high quality machining, it complicates analysis of the grinding process. In order to solve this problem, several computer simulations have been carried out using the Monte Carlo Method. Most of them statically calculate geometric interference between a grain and a workpiece, and have not provided enough achievements for practical applications. This chapter outlines the development of a simulation program based on the elastic behavior model of a grain. The program focuses on the generation process of a workpiece surface, and simulates the interaction of grains with a workpiece, which includes the elastic and plastic deformation and the removal of workpiece material. The simulation result is visualized using a three-dimensional graphics technique. The chapter illustrates an example, which verifies that the simulation program makes it easy to analyze the microscopic grinding phenomena, and can be used as a practical tool for predicting the grinding results and for optimizing grinding parameters. © 2006 Copyright © 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/B978-008045157-2/50025-0

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Language：Japanese   Publisher：The Japan Society for Precision Engineering  

For an accurate estimation method of grinding force generated in deep cut grinding process with ball-end grinding wheel, the grinding force is fundamentally analyzed in this study. This analysis consists of four parts as mentioned below : (1) Relation between the grinding force generated on the ball-end grinding wheel working surface and observed values obtained by tool dynamometer are theoretically made clear. (2) The grinding force distribution is experimentally investigated by the pin grinding test, and the unique grinding force distribution, which is not elucidated yet, is also made clear for the first time. (3) The relation between wheel interference angle and specific grinding force is analyzed by the results from the pin grinding test. (4) The grinding force increasing rate is experimentally investigated by the thin plate grinding ability test. Furthermore, the precision grinding force estimation method, which is essential to investigate the wheel fractured mechanism in deep cut grinding test, is established and also certified it's effectiveness.

DOI： 10.2493/jspe.71.1125

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Language：English   Publisher：TRANS TECH PUBLICATIONS LTD  

In this study, the crankshaft pin grinding mechanism, which is carried out with wheel head oscillating type CNC crankshaft pin grinder, is theoretically analyzed. In order to maintain grinding process, the pin rotates and also rocks along wheel working surface, because the wheel head oscillates with journal rotation. Then, it is made clear that cylindrical plunge grinding process progresses in the pin grinding process for the first time. Therefore, grinding speed ratio, which is defined as ratio of substantial pin surface speed to wheel surface speed, is firstly formulated. Secondly, undeformed chip size generated by a grain is estimated with the grinding velocity ratio. Finally, the grinding performance is predicted with experimental equations, which obtained previous study. By this simulation, it is made clear that dimensional accuracy and also surface roughness vary on whole of the pin surface with constant journal rotation grinding method. On the contrary, deviations of both the dimensional accuracy and the surface roughness are reduced with controlled speed ratio grinding method, in which journal rotation speed is adequately controlled.

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Language：English   Publisher：TRANS TECH PUBLICATIONS LTD  

In this study, the crankshaft pin grinding mechanism, which is carried out with wheel head oscillating type CNC crankshaft pin grinder, is theoretically analyzed. In order to maintain grinding process, the pin rotates and also rocks along wheel working surface, because the wheel head oscillates with journal rotation. Then, it is made clear that cylindrical plunge grinding process progresses in the pin grinding process for the first time. Therefore, grinding speed ratio, which is defined as ratio of substantial pin surface speed to wheel surface speed, is firstly formulated. Secondly, undeformed chip size generated by a grain is estimated with the grinding velocity ratio. Finally, the grinding performance is predicted with experimental equations, which obtained previous study. By this simulation, it is made clear that dimensional accuracy and also surface roughness vary on whole of the pin surface with constant journal rotation grinding method. On the contrary, deviations of both the dimensional accuracy and the surface roughness are reduced with controlled speed ratio grinding method, in which journal rotation speed is adequately controlled.

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Language：Japanese   Publisher：The Japan Society for Precision Engineering  

In contour grinding process with ball-end grinding wheel, successive cutting point spacing and also wheel peripheral speed change continuously on a working wheel surface. And these parameters will have an influence on grinding mechanism. Then, in order to make grinding mechanism clear, undeformed chip shape is theoretically analyzed in this paper. Fundamental relationships about substantial parameters, which represent the undeformed chip shape, such as chip thickness, chip length, interference angle and cross-sectional chip area, are theoretically analyzed. Then, in order to obtain these parameters, numerical simulation method is established. The undeformed chip shape is symmetrical form to rotational angle of cutting edge, and is extremely longer and also thinner than that in ordinary external cylindrical plunge grinding. Effects of tool and grinding conditions on the undeformed chip shape are investigated, and it made clear that an increase of wheel peripheral surface speed should be reduce cutting force affected on a grain. Furthermore, grinding force distribution on a wheel working surface is predicted considering with the chip thickness and the wheel peripheral speed.

DOI： 10.2493/jspe.70.251

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DOI： 10.11305/amjsip.2.0.12.0

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Language：English   Publisher：AVIATION INDUSTRY PRESS  

In this study, a non-contact type touch sensor, which can predict a machining start point in an external cylindrical plunge grinding process, is developed. The detecting mechanism of this sensor is based on the peculiar grinding fluid spouting phenomenon, which appears in a grinding process with a porous grinding wheel. Grinding fluid cools the sensor, which is previously heated by the Joule's heat slightly, and then a quantity of spouting grinding fluid increases with a decrease of a distance between grinding wheel and workpiece. Therefore, a unique touch sensing method is proposed, in which the residual wheel head approach distance can be predicted by the sensor output change in a wheel head approach.

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DOI： 10.11305/amjsip.2.0.18.0

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Language：Japanese   Publisher：養賢堂  

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Language：English   Publisher：The Japan Society of Mechanical Engineers  

In contour grinding, grinding force varies in a complex way, because the curvature radius of a workpiece varies and the real depth of cut is also influenced by the thermal deformation of a machine structure. Since low stiffness tools are generally used in contour grinding, the fluctuation of a grinding force results in a lower machining accuracy. In this study, therefore, in order to establish the high precision contour grinding method, the reference position correct sensor is developed to compensate the thermal deformation of a machine structure, and the controlled normal force grinding technique is proposed to restrain the fluctuation of a normal grinding force. High performance contour grinding method, with which both constant surface roughness and high dimensional accuracy can be obtained in any curvature radius of a workpiece, is developed by using the controlled normal force grinding method with the reference position correct sensor.

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Language：Japanese   Publisher：養賢堂  

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Language：Japanese   Publisher：The Japan Society for Precision Engineering  

In order to establish the high precision contour grinding method, the reference position correct sensor is first developed for compensating the thermal deformation of a machine structure, and then the controlled normal force grinding method is developed to control a fluctuation ofa normal grinding force. Main conclusions obtained in this study are as follows : (1) It is made possible to correct the error of wheel depth of cut accurately, with using developed reference position correct sensor. (2) The controlled normal force grinding technique is developed, through the analysis of the feed rate setting conditions correspond to the curvature variation of a workpiece. (3) High performance contour grinding method, with which both constant surface roughness and high dimensional accuracy can be obtained in any curvature radius of a workpiece, is developed by using the controlled normal force grinding method incorporate the reference position correct sensor.

DOI： 10.2493/jjspe.67.581

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Other Link： https://jlc.jst.go.jp/DN/JALC/00073175780?from=CiNii

Language：Japanese   Publisher：The Japan Institute of Marine Engineering  

The partial contacting wear test of spray coated ceramics was carried out by using pin-on-disk type wear testing machine. The test results of spray coated ceramics with no treatment were compared with that of Ni-P + PTFE plated spray coated ceramics. And observation of wear surface was carried out using together some methods of observation in order to analyze the wear surface in initial break-in condition quantitatively.<BR>The main results are in the following : Spray coated ceramics was worn abnormally after partial contacting wear test, but Ni-P + PTFE plated spray coated ceramics was worn normally, protecting from the damage by partial contacting. Phenomenon of surface break-in condition can be evaluated quantitatively by statistical treatment of wear surface profile.

DOI： 10.5988/jime1966.32.904

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In order to describe quantitatively the grinding process of partially stabilized zirconia (PSZ) with metal bonded diamond wheel, the analytical method established for metal grinding is applied to the grinding process of fine ceramics, and the theoretical values are compared to the experimental values. It is made clear that the plunge grinding process of PSZ with metal bonded diamond wheel can be represented by five independent characteristic parameters such as the size generation acceleration, the wheel wear rate, the grinding system stiffness, the contact stiffness and the cutting stiffness. By the characteristic parameters, variations of the grinding force, the stock removal, the residual stock through a grinding cycle and the grinding cycle time can be predicted. © 1989, The Japan Society for Precision Engineering. All rights reserved.

DOI： 10.2493/jjspe.55.167

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The circular cutting with a single point diamond cutting edge, in which the depth of cut is very small and takes maximum at some point, is carried out for making clear a cutting process of partially stabilized zirconia under conditions similar to practical grinding, investigating sliding phenomenon of a diamond cutting edge, normal cutting force, groove profile, stock removal and so on. Main conclusions obtained in this study are as follows : 11) There are three different regions with depth of cut ; elastic, plastic and cutting region. (2) There are critical depths and critical normal forces at the beginning point of plastic deformation and cutting. (3) In the transitional cutting process, there are following three types of interference with maximum depth of cut ; (i) elastic region through the contact length, (ii) elastic-plastic-elastic, (iii) elastic-plastic-cutting-plastic-elastic. (4) Surface generation of a groove is performed by plastic deformation as well as brittle fracture. © 1988, The Japan Society for Precision Engineering. All rights reserved.

DOI： 10.2493/jjspe.54.1544

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Cylindrical plunge grinding process and surface generation process of Sialon are experimentally investigated with bronze bond diamond wheel, analyzing grinding force, surface roughness, wheel wear, ground surface and so on. Main conclusions obtained in this study are as follows: (1) In a cylindrical plunge grinding process of Sialon with bronze bond diamond wheel, there are three distinct grinding processes such as spark-in, steady and spark-out. (2) Ground surface is formed by plastic deformation as well as brittle fracture in grinding Sialon. (3) Diamond grain primarily wears in attrition. (4) Grinding force increases with an increase of setting depth of cut, while surface roughness is hardly influenced by setting depth of cut. © 1988, The Japan Society for Precision Engineering. All rights reserved.

DOI： 10.2493/jjspe.54.1298

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DOI： 10.2493/jjspe.53.1271

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