SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING There are different kinds of blanks made by different processes, for example, castings, smith smith I and die forgings, cermets(blanks pressworked from sheet metal), welded blanks, and blanks cut die forging from rolled stock etc. One of the main trends in 热锻模 模锻件 the development of machining techniques is the improvement in the accuracy and surface finish of cermets blanks. that is, to make the shape and size of the‖粉末冶金 blanks as close as possible to those of the parts material wasted during machining. However, the =# ock This reduces the amount of machining androlled selection of the blank manufacturing processes unit production depends also upon the type of production, since cost the amount of blanks to be manufactured is the 单元生产成本 decisive factor when determining the unit production cost of the blanksSCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING There are different kinds of blanks made by different processes, for example, castings, smith and die forgings, cermets (blanks pressworked from sheet metal), welded blanks, and blanks cut from rolled stock, etc.. One of the main trends in the development of machining techniques is the improvement in the accuracy and surface finish of blanks, that is, to make the shape and size of the blanks as close as possible to those of the parts. This reduces the amount of machining and material wasted during machining. However, the selection of the blank manufacturing processes depends also upon the type of production, since the amount of blanks to be manufactured is the decisive factor when determining the unit production cost of the blanks. smith 锻工 cermets 粉末冶金 die forging 热锻模 模锻件 rolled stock 轧制材 unit production cost 单元生产成本