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Volume 23, Issue 272
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1957 Volume 23 Issue 272 Pages 475-480
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (2211K) -
The Influence of Temperature on Cutting ForceMakoto OKOSHI, Kisuke IIDA, Kazuo OZEKI1957 Volume 23 Issue 272 Pages 481-484
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCuttime forces at elevated temperature of work material (paraffin) were calculated in various cutting conditions experimented.
In general, the higher the temperature, the lower the cutting force.
Cutting force is affected by two factors; one is the shear strength of work material and the other is the factor related to the cutting mechanism. The former was decreased exceedingly at high temperatur as reported previously (Part 2), and influences of the latter is not so much. Therefore, the decrease of cutting forces is mainly due to low shear stren-gth of work material at high temperature.View full abstractDownload PDF (501K) -
Atsuomi IGATA, Kiyoshi OISHI1957 Volume 23 Issue 272 Pages 485-488
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe sharpening method of circular cutleries by electrolytic polishing was discussed in the previous report. The level of electrolytic solutions was kept constant and the resultant shapes of the cross section of the edge were comparatively slender. In this research the relatively slow motion between the level of the solution and the circular discs of the cutleries, that is, the gradual elevation of aqueous level was given by adequate attachments. Then the resultant shape of the polished edge was very desirable, that is a form was thick in the inner side and sharply thin in the peripheral side. This shape coincides with the theoretical estimation.
The details of the experiment are explained and the results are discussed.View full abstractDownload PDF (447K) -
Shot-peening effects on iron alloysToshio ASAEDA, Kiyoshi NISHIMOTO1957 Volume 23 Issue 272 Pages 488-491
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe shot-peening effects on some structures of iron alloys such as ferrite, pearlite and martensite structure were already described in the 5th report. Now, in this report N, e studied the shot peening effects on the sorbite, troostite and austenite structure of iron alloys. The pearlite plus cementite and martensite were used as the reference structure. The centrifugal wheel peening machine was used to shot-peen the test pieces and the residual stress, the depth of surface layer and the work-hardening effects were checked to estimate the peening effect.
The results were as follows :
(1) The greatest effect of shot-peening Was obtained on the martensite structure, secondly on the troostite, then on the pearlite+cementite and the smallest on the sorbite.
(2) The austenite structure was work-hardened not only on the surface, but also over the whole section of test piece. The residual stress on the surface was considerably low.View full abstractDownload PDF (696K) -
Kazuo NAKAYAMA1957 Volume 23 Issue 272 Pages 491-495
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the orthogonal cutting of 0.4% carbon steel and 18 Cr-8 Ni stainless steel at various temperatures and various cutting speeds, the two components of cutting force, shear angle and cutting temperature were measured. From these results, the friction angle between the chip and the tool face, the angle between the cutting force and the shear plane and the shear stress on the shear plane were obtained.
By analysing the results, the following were found :
1. The variation in cutting force may be explained by the variations of both the shear stress in the shear plane and the friction angle.
2. The variation of the friction angle may be explained by the variation of the flow stress of the work material at the tool face and the shear plane.View full abstractDownload PDF (942K) -
-Tool Grinding Conditions and Tool Performance-Hidehiko TAKEYAMA1957 Volume 23 Issue 272 Pages 496-500
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSTool-chip contact area has been demonstrated, by the previous papers, to be a controlling factor of machinability in terms of chip formation, shear angle, cutting force or surface finish. Since tool grinding conditions such as tool face roughness or grinding direction with regard to the chip flow have something to do with tool-chip contact. area, it can be easily supposed that tool grinding conditions will influence upon the tool performance appreciablly.
The test results have revealed that the tool face roughness of about 1.5 microns makes the smallest tool-chip contact area that means the best tool performance from the point of view mentioned above. The cutting force with a mirror lapped tool is nearly twice as that with a tool of the optimum roughness. By almost the same reason the best result can be attained when the grinding direction of the rake face is 40 or 45 degrees with regard to the chip flow. This means that the grinding conditions of a rake face control the metallic contact between chip and tool face or consequently the tool-chip contact area which greatly affects machining characteristics such as chip formation, cutting force, surface finish or sometimes tool life.View full abstractDownload PDF (1095K) -
[in Japanese]1957 Volume 23 Issue 272 Pages 501-504
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (796K) -
1957 Volume 23 Issue 272 Pages 509-511
Published: 1957
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (585K)
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