Cosmetic plastic mold parts drawing is the most important raw materials for processing. In the process of preparation, we must first of all be carefully analyzed. In order to deeply understand the characteristics of the parts of the structure and the main technology, usually have the study of cosmetic plastic mold assembly diagram, parts assembly and acceptance standards, understand the assembly relation function of the parts and related parts from it, and the main technical requirements set by the.

　　1 structural analysis of parts

　　Due to the use of different requirements, cosmetic plastic mold parts with a variety of different shapes and sizes. However, if analyzed from the shape, various parts are made up of some basic surface and irregular surface. The surface of the base has the inner and outer cylindrical surfaces, the conical surface and the plane, etc. the surface of the special-shaped surface is mainly composed of a spiral surface, an involute tooth surface and other irregular surfaces. In the study of the structural characteristics of the specific parts, the first part of the analysis should be composed of the surface, because the surface shape is the basic factor in the selection of processing methods. For example, outer surface by turning and grinding out hole cylindrical surface obtained by drilling, reaming, boring, reaming, grinding and EDM processing method; if it is non circular outer surface and non-circular hole surface by milling, grinding and EDM process. In addition to the surface shape, the surface size has an important impact on the process. For example, the big hole and small hole, deep hole and shallow hole, through hole and blind hole have different characteristics in the process. There are a lot of processing methods for large and small holes, but the method of small hole processing is not much. The hole processing of plastic mold is mainly made by drilling, EDM and wedm.

　　2 technical requirements analysis

　　The technical requirements of the parts include the following aspects:

　　Dimensional accuracy of the main processing surface;

　　The shape accuracy of the machined surface;

　　The accuracy of the position of the main processing surface;

　　The surface roughness of each cosmetic plastic mold and other requirements of surface quality;

　　Heat treatment requirements and other requirements.

　　According to the characteristics of the structure of the plastic mould of the cosmetics, after analyzing the technical requirements of the main surface of the parts, the processing technology of the parts is preliminarily understood. First of all, according to the precision and surface quality of the main surface of cosmetic plastic mold requirements, preliminary determine the processing methods required to meet these requirements, and then determine the processing methods required for the intermediate process and corresponding rough machining process. For example, in the case of the IT7 hole with small pore size, when the final processing method is used to obtain the precise hinge, the reaming hole is usually processed by drilling, reaming and reaming. Secondly, it is necessary to analyze the relative position relationship between the machined surfaces, including the dimension relation between the surfaces and the relative position accuracy. Analysis of the dimensions of the part drawing and the position accuracy of the main surface can be used to determine the processing sequence of the machined surface.

　　The requirements of heat treatment of cosmetic plastic mold parts affect the selection of machining methods and machining allowance. For example, carburizing and quenching parts, heat treatment after the general deformation. For the surface parts of high precision, to arrange for finishing process on (grinding or etching processing, through hole is used for WEDM), but also to increase the machining allowance for machining process.

　　In the study of cosmetic plastic mold parts, such as found in cosmetics plastic mold on the drawing view, dimensions and technical requirements of any error or omission, or parts of the structure process is not good, should put forward amendments. But changes must obtain the design personnel consent, and after approval of the necessary analysis and improvement of the designer consultation, to ensure that in the premise of ensuring product quality, more easily manufactured parts.