巻号一覧
15 巻 (1981 - 1982)
- 30 号 p. 1-
- 29 号 p. 1-
15 巻, 29 号
選択された号の論文の4件中1～4を表示しています
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松田 稔1981 年 15 巻 29 号 p. 1-10
発行日: 1981/09/30
公開日: 2010/03/12
ジャーナル フリーOn the high energy forming, the source length becomes important factor to the generated shock pressure characters, as the length of source can not be neglected comparing with the pulse duration of generated pressure.
The shock pressure generated by such identified line source is varied in its waveform (not only peak pressure but also pulse duration) to the radiated direction.
This paper deals with the general directional characteristics of this pressure and especially the effective pulse duration and energy co-factor are defined. From the results, it can be found that the length of pressure source considerably influences to the radiated pressure characteristics and the defined factors give one of the effective index for radiated shock pressure.抄録全体を表示PDF形式でダウンロード (1485K) -
塩田 泰仁1981 年 15 巻 29 号 p. 11-19
発行日: 1981/09/30
公開日: 2010/03/12
ジャーナル フリーThis paper describes how to use radio signals during machining on Wire EDM to distinguish machining conditions. From experimental results it was found that radiation in stable state occurs more than one in unstable. Hence, a detectivemeter on machining conditions is proposed for a operator to catch the condition. Accordingly, peak frequencies of radiation are precisely checked and a relation of radio signals to removal rate is quantitatively discussed. These check and discuss are also useful to prove radio-signal sensor not only for distinguishing but also for optimization of machining conditions. In consequence it was showed that radio signals have more application in the future.抄録全体を表示PDF形式でダウンロード (614K) -
単発放電, 繰返し放電および熱処理効果と応力分布の関係向山 芳世, 緒方 勲, 日原 政彦1981 年 15 巻 29 号 p. 20-32
発行日: 1981/09/30
公開日: 2010/03/12
ジャーナル フリーIn electric discharge machining, as the residual stress that generates on surface of workpiece is extremely harmful for the quality of products, it is strongly required to investigate the generated causes and its decrease with inquiring high reliability and accuracy of products. Previously, the residual stress was analyzed theoretically according to caluculation of heat conduction by the use of Monte Carlo method, and further the relationship between electric machining conditions such as energy supplying duration, peak discharge current and residual stress distributions were observed experimentally in the case of impulse discharge by the method of X-ray measuring. Consequently, it was found that the experimental values agreed well with the theoretical results. But, a many factors, that are affected to the numerical value and distribution etc. of residual stress, are considered except for those electrical machining conditions.
In this paper, considering the importance of these problem, the stress distribution that generates on surface of repetitional discharge machining was compared with the case of impulse discharge. And the residual stress on surface of the cold work die steel (SKD11, after heat treatment at annealing, quenching and tempering), which is used very frequently for die, was measured experimentally and observed. Subsequently, the metallographic observation of electric discharge machining surface was made by means of X-ray diffraction to discuss the connection with stress distribution.抄録全体を表示PDF形式でダウンロード (1302K) -
久保田 護, 田村 祐二1981 年 15 巻 29 号 p. 33-43
発行日: 1981/09/30
公開日: 2010/03/12
ジャーナル フリーElectrodischarge hardening or coating process being used to elongate steel tool life has a demerit of rough surface finish compared with its thin thickness.
In order to get more smooth surface without removing its material ultrasonic hammering process is investigated.
A diamond ball fixed on an ultrasonic vibrating tool was pressed onto the electrodischarge machined surface or the electrodischarge coated surface of the work on the vibrating table.
Experiments were carried out under the following conditions: diamond ball diameter 5.6mm, ultrasonic frequency 22kHz, generator output power 100-300W (tool amplitude 13-24μm), pressing force 1-3kgf, feeding speed 60mm/min, work amplitude 4mm, work frequency 950cpm.
Die steel works after EDM or electrodischarge coating were finished by the ultrasonic hammering. EPMA analysis, microhardness and roughness measurements result in the followings:
1) Roughness of electrodis charge machined steel surface (initially Rmax 26μm) is smoothened by ultrasonic hammering (finally Rmax 3μm) and increases its hardness (in Hv 100-200).
2) Surface layer generated by the electrodischarge coating consists of the two electrode materials.
3) Electrodischarge coated steel surface with a cemented carbide electrode decreases its roughness from Rmax 18μm to 3μm and increases its hardness up to Hv 1300.
4) In cutting-off of mild steel rod high speed steel lathe tool increases its life in 2 times after the electrodischarge coating and 2.6 times after the ultrasonic hammering of it.抄録全体を表示PDF形式でダウンロード (7479K)
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