英语作业---电火花加工

1、2021/3/111 讲解员：讲解员： 范壮壮范壮壮 Electrical discharge machining 2021/3/112 Content The concept of the EDMThe concept of the EDM1 The principle of the EDM2 The characteristics of the EDM 3 Development direction of EDM4 2021/3/113 1 The concept of the EDM Electrical discharge machining is a special processi

2、ng method, which is used to resist the electrical erosion caused by the pulse discharge between two electrodes in the working fluid. It is also known as the discharge machining or electrical etching process, which is called EDM 电火花加工是利用浸在工作液中的两极间脉冲放电时产电火花加工是利用浸在工作液中的两极间脉冲放电时产 生的电蚀作用蚀除导电材料的特种加工方法，又称放

3、电生的电蚀作用蚀除导电材料的特种加工方法，又称放电 加工或电蚀加工，英文简称加工或电蚀加工，英文简称EDM 2021/3/114 2 The principle of the EDM w In insulating working fluid, generating a pulse of the spark discharge between the tool and the workpiece,producing instantaneous high temperature and the melting off the surface of the workpiece, to achiev

4、e the purpose of the metal surface is processed. w 在绝缘工作液中，工具与工件间产生脉冲性在绝缘工作液中，工具与工件间产生脉冲性 火花放电，产生局部瞬时高温，使工件熔化火花放电，产生局部瞬时高温，使工件熔化 而抛离工件表面，达到金属表面被加工的目而抛离工件表面，达到金属表面被加工的目 的。的。 2021/3/115 11 电火花加工原理图电火花加工原理图 2021/3/116 w The workpiece and tool are respectively connected with the two input end of pulse p

5、ower supply,automatic feed adjustment device to make the tool and the workpiece often maintain a small discharge gap,when the pulse voltage is applied to the two poles,in that case and at the relative minimum of a gap or at the lowest insulation strength which the dielectric is punctured ，then produ

6、cing spark and discharge, when in the instantaneous high temperature，a small portion of the metal of the tool and the workpiece are removed ，each form a small pit.Next the process repeats and repeats. 2021/3/117 w 工件和工具分别与脉冲电源的两输入端 相连接。自动进给调节装置使工具和工 件经常保持一个很小的放电间隙，当脉 冲电压加到两极之间时，便在当时条件 下相对某一间隙最小处或绝缘强

7、度最低 处击穿介质，在该局部产生火花放电， 瞬时高温时工具和工件表面都蚀除掉一 小部分金属，各自形成一个小凹坑,接下 来该过程重复发生。 2021/3/118 3 The characteristics of the EDM w 1、For high-hardness conductive material processing. w 2、Easy to process slender, thin, brittle parts and complex parts w 3、Workpiece deformation small, high- precision machining w 4, Ea

8、sy to realize the automation of machining process advantage 2021/3/119 w 用于加工高硬度导电材料。 w 便于加工细长、薄、脆性零件和形状 复杂的零件。 w 工件变形小，加工精度高。 w 易于实现加工过程的自动化 2021/3/1110 w 1 Conductive material can only be processed. w 2 Machining accuracy is limited by the loss of electrode w 3 Processing speed is slow w 4 The minimum radius of fillet is limited by the discharge gap. disadvantages 2021/3/1111 w 只能对导电材料进行加工。 w 加工精度受到电极损耗的限制。 w 加工速度慢。 w 最小圆角半径受到放电间隙的限制。