Plastic mold material selection

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(Free-Press-Release.com) January 5, 2012 -- Plastic mold material selection is the mold manufacturing process is an important link in.
Plastic mold material needs to meet three principles, abrasion resistance, strong toughness mold to meet the work requirements, mold process to meet the requirements, at the same time should meet the economic applicability.
Plastic mold meet requirements of working conditions.
1, wear resistance

Billet in mold cavity plastic degeneration, along the cavity surface of both flow and sliding, the cavity surface and generate intense friction between billet, thereby causing the mold because of wear and failure. So the wear resistance of the composites is mold the most basic, one of the most important properties.
Hardness is the main factor influencing abrasion resistance. In general, mould parts of the higher hardness, wear volume smaller, better wear resistance. In addition, wear resistance and carbide materials species, quantity, morphology, size and distribution.
2, strong toughness
Die working conditions are very poor, some often bear larger impact load, leading to brittle fracture. In order to prevent mold parts when working in sudden brittle fracture, plastic mold with high strength and toughness.

Die toughness depends mainly on the material of the carbon content, grain size and microstructure.
3, fatigue fracture properties
In the working process of the die, the cyclic stress under the long-term effects, often leads to fatigue fracture. In the form of small energy impact fatigue fracture, tensile fatigue fracture of contact fatigue fracture and bending fatigue fracture.
Mold fatigue fracture performance mainly depends on the strength, toughness, hardness, as well as the material content of inclusion.
4, high temperature performance

When the die temperature than Gao Jin, will make the hardness and strength decreased, leading to die early wear or plastic deformation and failure. Therefore, the mold material should have high resistance to tempering stability, to ensure that the mold at operating temperature, high hardness and strength.
5, resistance to thermal fatigue properties
Some plastic mould in the working process in the repeated heating and cooling condition, so that the cavity surface tension, pressure stress effect, cause surface cracking and spalling, increasing friction block, plastic deformation, reduces the dimension precision, thus leading to the ineffectiveness of the die. Thermal fatigue of hot work die failure is one of the main forms of help, this kind of mold should have higher resistance to thermal fatigue performance.
6, corrosion resistance

Some molds such as plastic mold in the job, because the plastic in the presence of chloride, fluoride and other elements, heat decomposition precipitation of HCI, HF strong corrosive gas, the erosion surface of the mold cavity, increase the surface roughness, aggravate the wear failure.
The mold can be divided into auto mould , plastic commodity mold , home appliances mold , pipe fitting mold , plastic injection mold .