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Three principles of mold selection(一)

Jun 05, 2019

一.the mold meets the requirements of working conditions


1, wear resistance

As the mold changes plastically in the mold cavity, it moves or slides along the surface of the cavity to generate significant friction along the surface of the cavity. One of the important performances.

 

Hardness is a major factor affecting wear resistance. In general, the wear resistance also extends to the type, amount and shape of the carbides present in the material. Size and distribution are related.

 

2, the inertia

The operating conditions of the mold are so degraded that severe breaks can occur as the mold parts become brittle during operation.

 

The properties of the mold depend mainly on the carbon content, grain size and texture of the material.

 

3 performance fatigue tear performance

In the mold manufacturing process, a small diameter multiple impact fatigue failure, tensile fatigue and bending fatigue under the action of the cyclic force generally occur.

 

The fatigue strength of the molds depends mainly on their strength, hardness and crack content of the material.

 

4, high temperature performance

Higher operating temperatures of the mold can reduce hardness and strength and cause premature wear or plastic deformation of the mold. He has more hardness and strength.

 

5, resistance to thermal fatigue resistance

Some molds are in a state of repeated heating and cooling during operation, pulling on the mold surface, modifying the pressure, increasing friction, preventing plastic deformation and reducing dimensional accuracy. Thermal fatigue properties are one of the senses of thermal efficiency, and they have relatively high thermal fatigue properties.

 

6, engraving resistance

In some molds such as plastic molds, elements such as chloride and fluorine are present during operation and, after thermal decomposition, precipitate strong corrosive gases such as HCl and HF and render their surface rough. And rough the surface.