All issues
Volume 37, Issue 443
Displaying 1-12 of 12 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1971 Volume 37 Issue 443 Pages 843-848
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (3138K) -
Study on Wringing Force of Block Gauges (Report 4)Kiyoji TSUMURA, Yasuharu FUJII1971 Volume 37 Issue 443 Pages 849-854
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn wringing block gauges, one block gauge is crossed at right angles over the other and swung until the sides of both blocks become parallel. The force required for its swinging is considered to be related with wringing force and the torque of such force is termed here wringing torque.
Cohesive force, tensile strength and tangential resisting force were analyzed in our previous reports, and in this report analysis is made of the fundamental characteristics of wringing torque. The findings are summarized as follows:
1. It is necessary to consider wringing torque also in terms of static wringing torque and dynamic wringing torque.
2. Wringing force also arises from surface tension and viscosity of oil existing between the wringing surfaces.View full abstractDownload PDF (2538K) -
Measurement of Cutting TemperatureSusumu KASEI, Toshio HARA, Masahiro MASUDA1971 Volume 37 Issue 443 Pages 855-860
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the cutting temperature on turning with a self-propelled rotary cutting tool. The measurement of the cutting temperature was carried out by tool-work thermocouple. The characteristics of the rotary cutting tool was compared with that of the conventional cutting tool. In addition, the cutting temperature was discussed by means of cutting energy which was estimated by cutting force and mechanism of chip formation and so forth.
The results obtained are as follows.
1) The cutting temperature on turning with the rotary cutting tool is smaller than that with the conventional cutting tool, and the discrepancy varies in the inclination angle of tool.
2) The difference of temperature between the rotary cutting tool and the tool with the fixed edge depends on the heat generation of the region of tool-chip interface rather than that of the shear region.View full abstractDownload PDF (1108K) -
On the Wear of the Wheel ElectrodeTadao TSUTSUI1971 Volume 37 Issue 443 Pages 861-866
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSWhen tungsten carbide (workpiece) is ground with a cast-iron wheel electrode, the electrode wear is investigated and the following results are obtained.
(1) The wear ratio is about irrelevant to the condenser capacity and the charging resistance, but it decreases with increasing source voltage.
(2) When tungsten carbide is connected with the anode, it is found that the smaller is the inductance in the discharge circuit, the lower becomes the wear ratio.
(3) The wear ratio is scarcely influenced by dielectric fluids (mineral oil), and therefore it is desirable to use such fluids as increase the metal-removal rate.
From the above results the condition can be found, which decreases the wear ratio and increases the metal-removal rate.View full abstractDownload PDF (1020K) -
On the Stochastic Group and the Probabity Density Functions for the Contact PhenomenaRyozo SETOGUCHI1971 Volume 37 Issue 443 Pages 867-873
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSAs for author's succesive studies, the number of all asperities on the solid surface exhibiting one of the sample space and the probability density functions (p.d.f.) with reference to the number of contact spots and the real contact area at the lst process in the analysis of contact phenomena are determined, because it is clear that the nature of the contact problems is resulted from the stochastic phenomena, and then the basic quantities about the state of the contact phenomena, for example the number of contact spots and the real contact area, are gained by them according to the probability theory.
Moreover, the method of analysis for the dynamic cantact phenomena caused by the relative motion is developed from the above method of analysis for the statical contact phenomena.
These evaluation method applied for the contact phenomena are proved by some experiments and the Monte-Carlo method simulation.
So, in this paper, as the lst report, the method of determining the number of surface asperities as the size of the statistic set, and the p.d.f. as the probability expressions on the 3 dimensional characteristics of the solid surface are mainly discribed.
In this case, making use of the probability properties basic on the roughness curve signified as one of the cross section on the solid surface, the density of the surface asperities and the p.d.f. as the basic expression for the analysis of the contact phenomena are determined by the two roughness curve perpendicular each other.View full abstractDownload PDF (1280K) -
Makio MIZUNO1971 Volume 37 Issue 443 Pages 874-880
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis report is concerned with the experiment on basic wear carried out by the radioactive tracer technique. The phenomena of transfer, back transfer and removing out of track of wear particles have been quantitatively investigated by this technique. Based on the experiment with the behaviour of moving and the well-known fact of oxidation of wear particles, the general theoretical formura indicating the relation between wear and sliding distance is obtained as follows,
Wcom=WsA0pL0/k1+k2+k3+k5(1-k3+k4/k1+k2+k3){1-exp(-k1-k2-k3-k5)N}+(k3+k4)WsA0PL0/k5(k1+k2+k3)·{1-exp(-k5N)}+Ws'A0pL0N-Ws'A0pL0/k5{1-exp(-k5N)}·
Where, Wcom: total wear after N revolutions, Ws: specific wear at single rubbing, Ws': specific wear at steady state, A0: apparent contact area, p: apparent contact pressure, L0: sliding distance per revolution, N: number of revolutions, k1k5: constant.
The character of various wear curves can be explained consistently by this expression, particularly quite well unkown concave wear curves.View full abstractDownload PDF (2533K) -
Akiumi KURIYAMA1971 Volume 37 Issue 443 Pages 881-887
Published: December 05, 1971
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSType-head driving system in printer is possible to be replaced by the linear vibration system which is composed of masses, springs and viscous dampers. This paper presents the residual vibration on the positioning of the multi-degree-of-freedom system driven by cam. By analyzing the residual vibration to the components due to the natural frequencies of the system and comparing them with the single-degree-of-freedom system, the following results are obtained:
(1) The ratio of amplitude of the multi-degree of-freedom system to that of the single-degree-of-freedom system only depends on the characteristics of the systems and has no relation with cam profile.
(2) In case of the undamped system, the following expression are given:
Ak(λ)=Ck·A1(λ·ωk/ω1), where Ak(λ) is the amplitude of the k'th component, Ck is coefficient decided by characteristics of the system, ωk is the k'th natural frequency, and λ is the ratio of cam-rise-period to the first natural vibration period of the system.View full abstractDownload PDF (1047K) -
Koichi SEIMIYA, Sukemitsu ITO1971 Volume 37 Issue 443 Pages 888-893
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSElectrolytic products yielded during ECM such as metallic ions, their oxides and hydroxides on the anode and hydrogen bubbles on the cathode form concentration boundary layers as they are carried away by the electrolyte flow. The products increase drag force along the flow passage to reduce the flow rate. When the machining current and the tool feed are simultaneously stopped during ECM by the same electric signal, the concentration boundary layers disappear within a few miliseconds, resulting in gradual increase of the flow rate until a new equilblium. In those circumstances some experiments and hydraulic analysis are performed in this paper. The main results are as follows.
(1) The influence of the electrolytic products on electrolyte flow rate increases with the machining time.
(2) The linear relationship is recognized between Δλ and IC/Q, where Δλ is apparent increase of skin friction coefficient, I machining current in amperes, C evolution rate of hydrogen gas (= 0.116 cm3/coul.), and Q flow rate in cm3/s.View full abstractDownload PDF (3303K) -
In Gray Cast IronJunichiro KUMABE, Toshiho FUKUDA1971 Volume 37 Issue 443 Pages 894-900
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of this study is to obtain better surface roughness, roundness and cylindricity in boring gray cast iron. The experiments are carried out by the insensitive vibrating cutting mechanism. For this vibrating boring a new ultrasonical torsional vibration boring device can be created. This device fixed on the carriage of the lathe enables to bore a hole of 50 mm in minimum diameter and 180 mm in maximum length. This cutting conditions are as follows: The vibration of tool; in the same direction as that of boring, frequency; f=20 kHz constant, amplitude; a=24 μ constant, cutting speed; 11280 m/min, depth of cut; 0.020.10 mm, critical cutting speed vc=2πaf; 181 m/min. The main results are as follows : 1) Machined surface roughness as far as cutting speed 60 m/min that is nearly equal vc/3 coincides with the theoretical roughness. 2) Under 0.04 mm in depth of cut, 0.05 mm/rev in feed, 1.35 mm in nose radius, and 22 m/min in cutting speed, surface r0oughness of 0.3 μ is obtained. This more smoothed surface of 0.3 μ Hmax has made a new ecord in cutting gray cast iron. 3) Roundness of 5 μ, and cylindricity of 1 μ per the bore length of 90 mm are obtained. 4) By this study, it is proved that a hole of cylinder liner can be bored precisely by this vibration boring with carbide tool K 10.View full abstractDownload PDF (7143K) -
Study on Laser Machining of Thin Films (3rd Report)Kiichi TAKAMOTO, Satoshi NAKAYAMA1971 Volume 37 Issue 443 Pages 901-906
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe various factors having influence on the characteristics of thin film machining with a Q-switched laser are evaluated theoretically and experimentally. First, the radial distributions of temperature in thin films are presented in a simplified and generalized form by modifying the solution of the heat flow equation and the effects of the beam parameters and material properties on the machining results are investigated. Next, the practical applicability of the theoretical results is discussed experimentally. The results obtained are as follows :
1) For the area where the distance from the center is within 1.5 times the beam spot size ωf, the temperature distribution can be approximated by a Gaussian one. It is expressed by the simple equation which consists of a temperature spot size ωt defined in the same manner as ωf and a threshold power Po, m required for machining.
2) ωf is in the region of 10 μm - 20 μm, ωt is nearly equal to ωf. When ωf is less than 10 μm, ωt varies with the thermal conductivity of a thin film.
3) The experimental values of Po, m agree qualitatively with the calculated results. With respect to ωt, the difference between the experimental and theoretical values is less than 15%.View full abstractDownload PDF (1009K) -
[in Japanese], [in Japanese], [in Japanese]1971 Volume 37 Issue 443 Pages 907-912
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (2661K) -
[in Japanese]1971 Volume 37 Issue 443 Pages 913-914
Published: December 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (195K)
- |<
- <
- 1
- >
- >|