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Volume 31, Issue 362
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[in Japanese]1965 Volume 31 Issue 362 Pages 211-219
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (5150K) -
On the Stock Removal RateTadao TSUTSUI1965 Volume 31 Issue 362 Pages 220-226
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe stock removal rate in the electric-discharge grinding (R-C circuit) was studied experimentally under various electrical conditions. The results are as follows:
(1) The stock removal rate is proportional to the maximum electric-discharge power and increases as the capacity of the condenser becomes larger.
(2) The experimental formula of the stock removal rate M is given by
M = KCnE2R-1(0<n<1)
where C : capacity of condenser, E : source voltage, R : charging resistance, K and n : experimental constant.
(3) The removal rate is influenced by the work material and increases in the order of tungsten carbide, high speed steel and carbon steel.
(4) When using a cast-iron wheel electrode, it is better that either tungsten carbide is connected with the anode, or high speed steel or carbon steel is connected with the cathode.View full abstractDownload PDF (1018K) -
Yoshinobu TANAKA, Hideo TSUWA, Suehisa KAWAMURA1965 Volume 31 Issue 362 Pages 227-233
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCutting edges mean not always abrasive grains that are supported by bond but there are many types of cutting edges, such as grains coated with bond and bonding bridges acting as cutting edges and so on, because grinding wheels are constituted of abrasive grains and bond material.
As cutting abilities of bond material are far inferior than that of abrasive grains, the more bond material acting as cutting edges exist, the poorer cutting abilities of grinding wheels become.
The virtue of grade on the performance of grinding wheels owe not only the bonding forces that have influence upon the shapes and the distributions of cutting edges but also amount of bond material acting as cutting edges.
In this report, some discriminating methods between bond material acting as cutting edges and abrasive grains are described, and the behaviors of the former in grinding process, such as wear and distributions are studied through microscopic observations.
The results are as follow;
(1) for the discernment of cutting edges whether they are abrasive grains or bond material, difference of streaks pattern on the worn surface of cutting edges are utilized most effectively,
(2) bond material acting as cutting edges increase as harder the grade of wheels, and about vitrified wheels of A 46, from 25 to 40 per cent of cutting edges of all are occupied by bond material.View full abstractDownload PDF (14434K) -
Electrolytic Lapping of Cemented CarbideMamoru KUBOTA1965 Volume 31 Issue 362 Pages 234-239
Published: March 05, 1965
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA new process of hard metal working called electrolytic lapping was studied. A rotating mild steel plate lap was connected to the negative pole of D.C. source and work pieces of cemented carbide were to the positive. Abrasives suspended in electrolyte were thrown on the lap surface by its own rotation. Experimental results obtained are as follows.
(1) The surface roughness finished is 1μ Hmax and edge roundness is 0.05 mm in the following condition : lap speed 9.3 m/sec; work pressure 1 kg/cm2; electrolyte NaNO3 5%+NaNO2 5%+NaF 5% mixed water solution; abrasives 320 mesh SiC; mix ratio 0.25g/cc; current density 30 A/cm2.
(2) When the carbide alloys containing 6% Co (G2K, S2) are worked, stock removal rates are not proportional to the electric currents and have a maximum and a minimum. In the maximum point stock removal rate is 0.04 g/A min and in the range of relatively high current density (over 20 A/cm2) it becomes 0.013 g/A min, which is similar to the rate of common electrolytic grinding.
(3) Tool wear was 45% of lost carbide alloys in volume through the whole experiments, and in the optimum condition it may be about 20%.View full abstractDownload PDF (8495K) -
Kazuo NAKAYAMA, Kiyoshi TAMURA1965 Volume 31 Issue 362 Pages 240-249
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe theoretical consideration of energies consumed in metal cutting and the experimental observations on orthogonal light cutting of 4-6 brass lead to the conclusion that the size effect in cutting force can be explained as follows: with the decrease in depth of cut, the specific cutting force increases because of
(1) decrease in magnitude of shear angle
(2) the work consumed in the plastic flow of surface layer which is not proportional to depth of cut
(3) decrease in magnitude of real rake angle due to roundness of cutting edge
Considering these facts, the calculated shear stress on the shear plane shows no appreciable variation due to the decrease of depth of cut.View full abstractDownload PDF (6455K) -
Plain Carbon SteelsHidehiko TAKEYAMA, Tomohiko ONO, Kaneyoshi MIYASAKA1965 Volume 31 Issue 362 Pages 250-259
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe factors to affect the surface quality in turning can be classified into two categories, that is, controllable and uncontrollable factors. The most serious problem of the latter is built-up edge.Without such the disturbance, surface roughness produced conforms quite well to the theoretical value calculated by tool shape and feed which are so-called controllable factors.
Whether the surface finish produced is free from the disturbance depends upon the cutting conditions, of caurse. Thus, there exists two separate domains of cutting conditions (cutting speed and feed, actually) which yield nearly theoretical roughness and highly disturbed, respectively, the former being defined "normal region" and the latter "abnormal".
This report stresses upon a methodological study to establish the machining standards in view of surface finish in turning plain carbon steels (0.15 C0.55 C). The boundaries of aforementioned domains are experimentally figured out for the respective steels.
Within the normal region the surface roughness produced can be described by the theoretical or slightly modified formula. With regard to the abnormal region conceivable factors to affect the surface roughness are investigated experimentally.View full abstractDownload PDF (5395K) -
Electro-chemical Characteristics of Sodium Chloride SolutionSukemitsu ITO, Kunio CHIKAMORI1965 Volume 31 Issue 362 Pages 260-265
Published: March 05, 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSNaCl solution is usually used in electrolytic machining process, so its electro-chemical characteristics were studied experimentally.
The results are as follows.
(1) The influences of the pH value are not recognized in the anodic polarization curves. But the influences are clearly recognized at low current densities in the cathodic polarization curves but they disappear at higher current densities.
(2) The concentration of NaCl does not influence the electro-chemical reaction but the conductivity of the solution.
(3) The anodic polarization curves of stainless steel are nobler than thost of mild steel or tool steel. The resistance polarization is detected in the anodes of copper and brass.
(4) The evaluations of the influences of NaCl concentration to the corrosion rate indicate that the corrosion rate of mild steel is slightly minimum at about the concentration of 4 mol/l NaCl.
(5) The corrosion rates of mild steel in 2mol/l NaCl solution including various inhibitors have been determined. That is the addition of sodium nitrite or one of the commertial inhibitors improves the corrosion characteristic of the solution and decreases the corrosion rate until onetenth of that of the non added solution.View full abstractDownload PDF (3663K) -
The Approximate Fundamental Equations on the Tomlinson Undulation Recorder and These SolutionsTeru HAYASHI1965 Volume 31 Issue 362 Pages 266-273
Published: March 05, 1965
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSThe Tomlinson undulation recorder is widely used measure to the undulations of large gears because of its easy handling. Since the recorded data of this recorder do not show the actual undulation, they need be analysed to obtain the undulation. Only on the sinusoidal undulation, the analyses becomes simple and was utilized up to this time.
But the results of our recent undulation measurements tell us that the undulation shows too complicated forms to be approximated by the simple sine waves and that an analyses applicable in general should be considered.
This paper relates to the analyses of obtaining the undulation from the recorded data in a general case. In this first report, the approximate fundamental equations are obtained in which the gear is regarded as a rack plate. These equation are solved both numerically and graphically.The method of interpolating the obtained points on the curve also shown. Using these analyses, (1) the possible least amplitude of undulation can be estimated in a general case, and (2) the whole undulation can be obtained when the undulation belong to the C-type.View full abstractDownload PDF (1324K) -
1965 Volume 31 Issue 362 Pages e1
Published: 1965
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (48K)
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