The requirements of die design are: accurate size, smooth surface, reasonable structure, high production efficiency, easy automation, easy manufacture, high life and low cost.
Die structure design and parameter selection must consider the rigid, guiding, unloading mechanism, positioning method, the gap size and other factors. Die on the vulnerable parts should be easy to replace. For the plastic mold and die casting die, it is also needed to consider the reasonable gating system, molten plastic or metal flow state, the position and direction of the cavity. In order to improve the productivity and reduce the loss of runner casting, the multi cavity mould can be adopted, and the same or different products can be completed simultaneously. High efficiency, high precision and long life mold should be used in mass production.
Multi position progressive die should be adopted in the stamping die, which can be used to insert the hard alloy insert block progressive die in order to improve the service life of the die. In small batch production and trial production of new products, should use simple mould has the advantages of simple structure, fast manufacturing, low cost, such as combination dies, sheet metal stamping die, polyurethane rubber die, low melting point alloy mold, zinc alloy die, superplastic alloy die. The mold has begun to use the computer aided design (CAD), namely through the computer as the center of a set of system to optimize the mold design. This is the development direction of the mold design.
According to the structural characteristics of the mold manufacturing, divided into the plane of the punch and the cavity with a cavity mode. The punching die is precisely matched with the size of the concave die, and some even have no gap. Other die such as cold extrusion mould, die casting mould, powder metallurgy mold, plastic mold, rubber mold all belong to the cavity die for forming stereo shape of the workpiece. Model cavity in the long, wide, high 3 directions have size requirements, the shape is complex, difficult to manufacture. Mold production generally single and small batch production, strict and precise manufacturing, the precision processing equipment and measuring devices.
The plane punching die can be used in the initial forming process of EDM, and further improve the accuracy by using the method of forming grinding, coordinate grinding and so on.
Forming grinding can be used for optical projection curve grinding machine, or plane grinder with shrinkage imitation and grinding wheel mechanism, and can also be used in precision surface grinder. Coordinate grinding machine can be used for precision positioning of the mold to ensure the precision of the hole and the hole distance. Can also be used in computer numerical control (CNC) continuous path coordinate grinding machine grinding any curve shape of the convex and concave die. Multi cavity mold for copying milling machine, edm. The combined application of copying milling machine and CNC and in electrical discharge machining (EDM) increased three to translational head device can improve the processing quality of the cavity. Electrolytic process in the increase of air inflation can improve production efficiency.
