SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING LESSON TWO MACHINING ACCURACY Product quality is always a matter of prime importance in manufacturing. It should be given parameter the highest priority in process planning. The 参数,参量 quality of a machined part can be expressed in coordination geometrical parameters( dimension, shape,相互位置 coordination and surface finish, etc. ), physical surface finish parameters (electrical conductivity, thermal 表面光洁度 conductivity, magnetic conductivity, etc.) chemical parameters(corrosion resistance. etc. and mechanical parameters(strength, hardness, etc.). The requirements of these parameters of a part are determined by the designer, according to the condition under which the product is to function.(c)SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING LESSON TWO MACHINING ACCURACY Product quality is always a matter of prime importance in manufacturing. It should be given the highest priority in process planning. The quality of a machined part can be expressed in geometrical parameters (dimension, shape, coordination and surface finish, etc.), physical parameters (electrical conductivity, thermal conductivity, magnetic conductivity, etc.), chemical parameters (corrosion resistance. etc.) and mechanical parameters (strength, hardness, etc.). The requirements of these parameters of a part are determined by the designer, according to the condition under which the product is to function.(c) coordination 相互位置 surface finish 表面光洁度 parameter 参数，参量