来源：http://www.jnhjgs.cn 发布时间：2021-09-11 15:48:49 点击：
The requirements of mold design and manufacture are: accurate size and smooth surface; Reasonable structure, high production efficiency and easy automation; Easy manufacture, high service life and low cost; The design meets the process needs and is economical and reasonable.
Rigidity, guidance, unloading mechanism, positioning method, gap size and other factors must be considered in die structure design and parameter selection. The vulnerable parts on the die shall be easy to replace. For plastic and die-casting molds, it is also necessary to consider the reasonable gating system, the flow state of molten plastic or metal, and the position and direction of entering the cavity.
The first mock exam is to increase the productivity and reduce the runner loss. A number of identical or different products can be completed in one mold at the same time. In mass production, high efficiency, high precision and long service life molds should be used.
Multi station progressive die shall be adopted for stamping die, and carbide insert progressive die can be adopted to improve service life. In small batch production and trial production of new products, simple dies with simple structure, fast manufacturing and low cost should be used, such as combined die, sheet die, polyurethane rubber die, low melting point alloy die, zinc alloy die, superplastic alloy die, etc. The mould has begun to adopt computer aided design (CAD), that is, the optimum design of the mould is carried out through a complete set of computer-centered system. This is the development direction of mold design.
According to the structural characteristics, die manufacturing is divided into plane blanking die and cavity die with space. Blanking dies use the size of punch and die to fit accurately, and some even have no clearance. Other forging dies such as cold extrusion die, die casting die, powder metallurgy die, plastic die and rubber die belong to cavity die, which are used to form three-dimensional workpiece. The cavity mold has size requirements in three directions of length, width and height, and its shape is complex and difficult to manufacture. Mold production is generally single piece and small batch production, with strict and accurate manufacturing requirements, and most of them use precision processing equipment and measuring devices.
The plane blanking die can be formed by EDM, and then form grinding, coordinate grinding and other methods to further improve the accuracy. Form grinding can be carried out by optical projection curve grinder, or surface grinder with reduction and grinding wheel mechanism, or by special form grinding tools on precision surface grinder.
Coordinate grinder can be used for precise positioning of die to ensure precise hole diameter and hole distance. Computer numerical control (CNC) continuous trajectory coordinate grinder can also be used to grind punch and die with any curve shape. Cavity mold is mostly processed by profiling milling machine, EDM and ECM. The combination of profiling milling and NC and the addition of three-way translational head device in EDM can improve the machining quality of the cavity. Adding gas filled electrolysis in electrochemical machining can improve production efficiency.