英语翻译Material removal from ductile matesials can be accomplis
英语翻译 Material removal from ductile matesials can be accomplished by using a tool which is harder than the workpiece.However during World War the widespread use of materials which were as hard or harder than cutting tools created a demand for new material-removal methods.Since then a number of processes have been developed which,although relatively slow and costly,can effectively remove excess material in a precise and repeatable fashion.There are two types of processes.The first type is based on electrical phenomena and is used primarily for hard materials; the second depends upon chemical dissolution.