Generally, a die consists of a moving die and a fixed die (or a punch and a die). When parting, the workpiece is taken out, and when closing, the blank is injected into the mold cavity for molding. Die is a kind of precision tool with complex shape, which bears the bulging force of blank and requires high structural strength, stiffness, surface hardness, surface roughness and machining accuracy.
Extended data:
Compression molding is to directly add plastic into an open mold cavity with a certain temperature, then close the mold, and the plastic melts into a flowing state under the action of heat and pressure. Due to physical and chemical effects, plastics harden into plastic parts with certain shapes and sizes, which remain unchanged at room temperature.
At high temperature and a certain pressure, it passes through a die with a specific cross-sectional shape, and then it is molded into a continuous profile with a required cross-sectional shape at a lower temperature.
The production process of extrusion molding is preparation of molding materials, extrusion molding, cooling and setting, traction and cutting, and post-treatment of extruded products (quenching and tempering or heat treatment). In the process of extrusion molding, we should pay attention to adjusting the temperature, screw revolution and traction speed of each heating section of extruder barrel and die to obtain qualified extrusion profiles.
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