会计实务笔记11-第十一章 所得税会计(国外英文资料).docVIP

会计实务笔记11-第十一章 所得税会计(国外英文资料) The fifth chapter of the grinding and polishing of mould Grinding and polishing of mould is to reduce the surface roughness and improve the surface shape accuracy and increase surface gloss as the main purpose, is finishing, grinding process can be classified into categories. They are grinding and polishing in forming very similar theory, generally used for final processing products and parts. The modern mold surface accuracy and surface roughness requirements are increasingly high, especially the mold with high precision and high life requirements to m level accuracy. General to leave the inevitable grinding surface grinding marks, micro cracks and other defects, these defects greatly affects the accuracy of some of the mold, forming a part of the surface can be used in ultra precision grinding machining to meet the design requirements, but the most special and high precision surface grinding and polishing to most. For stamping die, die after grinding and polishing, improve the mould surface roughness for sheet flow, reducing the flow resistance, greatly improves the surface quality of forming parts, especially for the automobile panel is obvious. The blanking die grinding blade after grinding, can eliminate the scars of cutting edge, the blanking burr height reduction. Plastic mould grinding, polishing, greatly improve the cavity surface quality, improve the forming performance, meet the requirements of the quality of plastic parts, plastic parts and easy demoulding. The gating system by grinding, polishing, flow resistance can be reduced when the plastic injection. In addition to grinding and polishing can improve the surface precision of the die bonding, to prevent resin leakage, prevent sticking etc.. The electric spark forming mold surface will have a thin layer of metamorphic layer, metamorphic layer with many defects need to grind and polish the place. In addition to grinding and polishing can also improve the mechanical propertie