What are the elements of mold design


Mold design and manufacturing are closely related to pl […]

Mold design and manufacturing are closely related to plastic processing. The success or failure of plastic processing largely depends on the mold design effect and mold manufacturing quality, and the plastic mold design is based on the correct plastic product design.
The structural elements to be considered in plastic mold design are:
Parting surface, that is, the contact surface where the concave die and the convex die fit each other when the die is closed. The selection of its position and form is affected by the shape and appearance of the product, wall thickness, forming method, post-processing technology, mold type and structure, demoulding method and forming machine structure and other factors.
Structural parts, i.e. slide block, inclined top, straight top block, etc. of complex mould. The design of structural parts is very important, which is related to the life, processing cycle, cost and product quality of the mold. Therefore, the design of complex mold core structure requires a higher comprehensive ability of the designer, and seeks a simpler, more durable and more economic design scheme as much as possible.
Mold accuracy, that is, avoiding card, precise positioning, guide post, positioning pin, etc. The positioning system is related to the product appearance quality, mold quality and service life. According to the different mold structure, different positioning methods are selected. The positioning accuracy control mainly depends on the processing. The internal mold positioning is mainly considered by the designer to design a more reasonable and easy to adjust positioning method.
The gating system is the feeding channel from the injection machine nozzle to the cavity, including the main flow channel, shunt channel, gate and cold cavity. In particular, the gate location should be selected to facilitate the molten plastic to fill the mold cavity in a good flow state, and the solid flow channel attached to the product and the gate cold material can be easily ejected from the mold and removed (except for the hot flow channel mold) when the mold is opened.
The shrinkage of plastics and the factors that affect the dimensional accuracy of products, such as mold manufacturing and assembly errors, mold wear and so on. In addition, the matching of the technological and structural parameters of the molding machine should also be considered in the design of the press mold and the injection mold. CAD technology has been widely used in plastic mold design.