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Working conditions of the die.

  • Author:liuweiqiong
  • Source:liuweiqiong
  • Release on:2017-07-18
Folding abrasion resistance

When the billet is plastically modified in the mold cavity, the surface of the mold flows and slides along the cavity surface, causing severe friction between the surface of the cavity and the blank, thus causing the die to die due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold.

Hardness is the main factor affecting wear resistance. Under normal circumstances, the higher the hardness of the mold parts, the less wear and tear, the better wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material. 

Folding strength and toughness

Most of the working conditions of the die are very poor, and some of them often bear a large impact load, which leads to brittle fracture. In order to prevent the die parts from breaking suddenly at work, the die must have higher strength and toughness.
The toughness of the mould depends mainly on the carbon content, grain size and microstructure of the material.

Folding fatigue fracture behavior

In the course of the die work, under the long-term action of cyclic stress, fatigue fracture is often caused. Its forms include small energy, multiple impact fatigue, tensile fracture, contact fatigue fracture and bending fatigue fracture. 

The fatigue fracture properties of the die depend mainly on its strength, toughness, hardness, and the content of inclusions in the material.

Folding high temperature performance

When the working temperature of the die is higher, the hardness and strength will be reduced, which will lead to premature wear or plastic deformation of the die. Therefore, the mold material should have high resistance to tempering stability, in order to ensure the mold at the working temperature, with higher hardness and strength.

Folding resistance to thermal fatigue

Some of the mold in the repeated heating and cooling in the working process, so that the cavity surface tension and pressure stress effect caused by cracking and spalling, increase the friction surface, hinder plastic deformation, reduce the size precision, which leads to the failure of die. Hot and cold fatigue is one of the main forms of hot die failure, and this kind of mold should have higher thermal fatigue resistance.
Folding corrosion resistance
Some mould such as plastic mold at work, due to the presence of chlorine, fluorine plastic, after heat decomposition precipitation of HCI and HF strong corrosive gases, erosion of the mold cavity surface, increase the surface roughness, increased wear failure.

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