SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Other technological and economical problems should be resolved as well. For example, is it appropriate to adopt refined blanks(precision castings or forgings ) Is it suitable to use newly developed machining methods, machine tools or tooling(NC machine tools, machining centers, upper precision machining methods, advanced tools, Jigs and)skJ fixtures, etc.) or unconventional machining method钻模 (ECM, EDM, supersonic or laser machining, etc. ) All these questions have to be answered rationally in order to achieve reasonable manufacturing efficiency and low-cost production electro chemical machining电解加 electric discharge machining电火花加工SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Other technological and economical problems should be resolved as well. For example, is it appropriate to adopt refined blanks (precision castings or forgings)? Is it suitable to use newly developed machining methods, machine tools or tooling (NC machine tools, machining centers, upper precision machining methods, advanced tools, jigs and fixtures, etc.), or unconventional machining methods (ECM, EDM, supersonic or laser machining, etc.)? All these questions have to be answered rationally in order to achieve reasonable manufacturing efficiency and low-cost production. 夹具 钻模 electro chemical machining 电解加工 electric discharge machining 电火花加工