Study of armor steel EDM characteristics

• Main Authors: W. H. Chang, 張巍曦
• Other Authors: T. M. Shih
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/90764875140932585477

碩士 === 國防大學中正理工學院 === 兵器系統工程研究所 === 94 === Because of the progress with industrial national defense, the shelter demand for the weapon improves constantly too, Armor steel possessing a high hardness and high strength wait for good mechanical nature, and it is very easy to choose in strengthening the shelter of the weapon. But, Armor steel although the mechanical nature with excellence, characteristics cause tool wear and damaged situation of material when traditional machining is used. Hence, is it thinking other processing methods solve his problem to force. In addition, EDM can meet all produce between manufacturing field and demand that part process, but, the processing speed still dislikes slow, process getting rid of the good and bad key that the question concerns their processing efficiency of the bits at the same time. If adopted with this research institute EDM, this research designs proper routes to evacuate thread electrodes, very suitable for processing Armor steel choice. In this experiment shows four categories: (1) Taguchi method was required to efficiently determine are connected with several factors and levels which are related to EDM condition. This experiment show six factors, including polarity, peak current, pulse duration, pulse duration, pulse off time gap voltage and rotational speed, Furthermore, an analysis of variance can obtain the best single quality characters (for the highest material rate, the low electrode wear rate and fine surface roughness respectively); (2) Then we use the optimal factors got from the first step to investigate the material removal rate of works with various designed thread (including the rotational speed, thread pitch and thread direction) by applying Taguchi method again. Hence we can find the optimal parameters of three items (MRR, EWR, SR) by ANOVA; (3) Taguchi method is not well at handing the problems of multiple quality characteristics. The analysis TOPSIS method inference technique applied in multiple quality conventional design. Analyses via this experimental result that shows, comparing with electrodes without thread, the MRR can reach 221.112 mg/min and its improvement rate is 60.910 %.