All issues
Volume 34, Issue 403
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1968 Volume 34 Issue 403 Pages 511-516
Published: August 05, 1968
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (1026K) -
Shigeo ZAIMA, Tadao OKAZAKI1968 Volume 34 Issue 403 Pages 517-523
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe digital type tool dynamometer is made on trial, applying a measuring circuit which is developed for a sort of time measuring scale in using pulse signal. It can be directly read easily with good stability and high accuracy and follows easily on instant torque change. So in this paper, examining the characteristics of dynamometer applied on drilling aluminium alloy (17S-F). As the results :
(1) The trial dynamometer is useful and excellently in the point of accuracy and data regulation and, using it, a huge data is straightend in a short time.
(2) The effective drill point angle and lip clearance on drilling 17S-F is, in general, 140° and 715.5° respectively, but, in the case of very small feeding, the effective point angle is 110° and the lip clearance 7°.
(3) And the accuracy of the entrance of drilled ho!e is good when the point angle is about 110 in the case of small lip clearance like as 7°, but the good point angle is about 130° with rise of lip clearance like as 22°.View full abstractDownload PDF (2348K) -
On the Effect of Nose Radius of the ToolFumio HASHIMOTO, Naoki YAMASAKI, Hidekazu KUISE1968 Volume 34 Issue 403 Pages 524-530
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe application of the orthogonal cutting theory to the case of the single point cutting tool with side cutting edge angle and nose radius is discussed. The effective side cutting edge is considered as the substitute of the real side cutting edge of participating in the cutting, and four different types of the approximate calculations of the shear plane area are presented.
The values of shear strains and mean shear stresses on the shear planes calculated with these four methods by using the experimentally measured values of cutting resistance components and the thickness of the chip are investigated. As a result, it is made clear that the method of considering the cutting area as the trapezoid by assuming the effective side cutting edge in the extended direction of the straight part of the real cutting edge, or as the triangle by assuming the effective side cutting edge parpendicular to the direction of the maximun width of the cutting area is the best among the four calculations. By this method, the calculated values of shear strains and mean shear stresses for tools with nose radius are considerably similar to those for tools without nose radius.View full abstractDownload PDF (949K) -
Michiko MINO, Ichiro IDA, Yuzo ARAI1968 Volume 34 Issue 403 Pages 531-536
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe breakage of lead zirconate titanate ceramics becomes serious when lapping thin and slender plates for the purpose of piezoelectric bimorphs. Taking this into consideration, four kinds of these ceramics, that is, A (substituted Sr for a part of Pb), B (added Fe to A), C (added Nb to A) and D (added Cr to A) are examined concerning crystal grains, pores and fine textures after lapping, polishing and etching. The results obtained are as follows : The orders in properties are (1) D>B>C>A in percentage occupied by pores and in their number, (2) A>C>D>B in pore size, (3) A>C>D>B in grain size, (4) D>A>B>C in grain release, (5) B>D>C>A in microvickers hardness, (6) C>B>A in bending strength, (7) A>C>D in surface roughness and, (8) A>C>B>D in lapping yield. Therefore specimen D having marked release of grains is easily broken, while specimen C finished to relatively higher degree is suitable for making thin plates.View full abstractDownload PDF (8816K) -
Growth of Built-Up-EdgeHidehiko TAKEYAMA, Tomohiko ONO1968 Volume 34 Issue 403 Pages 537-540
Published: August 05, 1968
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn general, there are at least two conceivable factors to affect the growth of built-up-edge : one is the temperature at the tool-chip interface during cutting, and the other is the mechanical properties of work materials. As to the temperature effect, much has been clarified by many workers, so that this report is stressed upon the latter factor.
Here, theories of indentation in plasticity can be applied to analyze the contact between built-up-edge and work material, and the necessary condition for the built-up-edge to remain rigid and to grow as a temporary cutting edge can be obtained. By this analogy, it has been deduced that work-hardenability of work material is an important factor for the growth of built-up-edge.
This has been experimentally proved by machining tests of various types of steel and their material testings at elevated temperature.View full abstractDownload PDF (566K) -
Seizo KOIZUMI1968 Volume 34 Issue 403 Pages 541-546
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSFor improving the accuracy of Vickers impression measurement, especially for eliminating the personal error of the measurement, a new apparatus which utilizes photoelectric detection is developed.
The studies for a standard square pattern of Vickers impression type on the two photoelectric measuring methods, one is detection of the relative position of a corner of an impression by the a io output of photomultipliers in a photoelectric microscope of the apparatus and the other, the position of an edge of the impression by the differential output of the photomultipliers, reach the following results.
1) The maximum standard deviation of the measured values of diagonal length of the pattern obtained by the first method is less than 0.1μm under the optimum conditions where the set point of the ratio output is 0.05 and the magnification of the microscope is 65.6.
2) The accuracy of the length measurement by the second method is estimated to be better than 0.36μm or 0.03μm in the standard deviation according as the magnification is 16.7 or 65.6 respscrively.View full abstractDownload PDF (3540K) -
Yoshinobu TANAKA, Naoya IKAWA, Takeshi TANAKA1968 Volume 34 Issue 403 Pages 547-553
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSAs a part of research for the adaptability of abrasive grains to various workpieces, this paper presents the results of the theoretical and experimental analysis of fracture characteristics of the cutting edge of abrasive grains when applied to grinding of workpieces with various hardness.
On the assumption that the brittle fracture takes place at a certain stress in the grain, the expressions that show the condition of fracture are derived for the cutting edges with the assumed geometry of wedge shape, by analysing the slip line field that is produced in it by cutting force. Considering the average cutting edge geometry, practical parameters which characterize fracture are proposed as follows : B2=HV/5.9k and B3=HV/14k for the wedge shaped edge with and without flank face respectively, where Hv is the micro-Vickers hardness of workpieces and k the shear strength of the grain. The fracture takes place when B>1 and not when B<1. The critical hardness of workpieces predicted by the parameters is about 1000kg/mm2 for diamond, 100kg/mm2 for aluminum oxide and 120kg/mm2 for silicon carbide.
The theory well explains the results of observation of fracture and wear on the cutting edge of various abrasive grains.View full abstractDownload PDF (5776K) -
Teiji MIURA1968 Volume 34 Issue 403 Pages 554-559
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIt is generally known that profile curves contain roughness and waviness. But both the definition and the method of distinction have not been clearly shown yet. In this report, therefore, shaper worked surfaces have been prepared to be analized statistically by applying the theory of runs, the mean successive difference, the moving averages and average length and variance curves.
As the conclusions, the roughness and waviness have been distinguished statstically, clearly and objectively. And the evaluations of roughness and waviness have been examined by applying the new methods statistically.View full abstractDownload PDF (957K) -
[in Japanese]1968 Volume 34 Issue 403 Pages 560-564
Published: August 05, 1968
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (2675K) -
[in Japanese]1968 Volume 34 Issue 403 Pages 565-570
Published: August 05, 1968
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (867K)
- |<
- <
- 1
- >
- >|