Basic Performance Requirements of Steel for Air Cooler Mould
The working conditions of the Air Cooler Mould(FURNITUREMOULD) are different from those of the cold stamping mould. Generally, the air cooler mould must work at 150 C-200 C. Besides being subjected to certain pressure, it must also be subjected to temperature influence. The basic performance requirements of steel for air cooler mould are summarized as follows according to the use conditions and processing methods of air cooler mould:
1. Sufficient surface hardness and wear resistance
The hardness of the plastic mould is usually below 50-60 HRC. The heat-treated air cooler mould should have sufficient surface hardness to ensure sufficient rigidity of the air cooler mould. During the operation of the mould, due to the filling and flowing of plastic, the mould has to bear large compressive stress and friction force, which requires the mould to maintain the stability of shape accuracy and dimensional accuracy and ensure the mould has sufficient service life. The wear resistance of the mould depends on the chemical composition of the steel and the heat treatment hardness, so improving the hardness of the mould is beneficial to improving its wear resistance.
2. Excellent machinability
In addition to EMD processing, most air cooler mould to need certain cutting processing and fitter repair. In order to prolong the service life of cutting tools, improve cutting performance and reduce surface roughness, the hardness of steel used for air cooler mould must be appropriate.
3. Good polishing performance
For high-quality plastic products, the roughness value of the cavity surface is required to be small. For example, the surface roughness value of the injection mould cavity is required to be less than ra 0.1 ~ 0.25, while the optical surface is required to be ra < 0.01 nm. the mould cavity must be polished to reduce the surface roughness value. The steel materials selected for this purpose require fewer impurities, fine and uniform structure, no fibre directionality, and no pitting or orange peel defects during polishing.
4. Good thermal stability
The shape of air cooler mould parts is often complicated and difficult to process after quenching. It should try to choose the ones with good thermal stability. When the air cooler mould is formed and processed after heat treatment, the linear expansion coefficient is small, the heat treatment deformation is small, the dimensional change rate caused by temperature difference is small, the metallographic structure and the mould size are stable, and the processing can be reduced or stopped, thus ensuring the mould size accuracy and surface roughness requirements.
With the development of the plastic industry, the requirements for the complexity and precision of plastic products are getting higher and higher, and higher requirements are also put forward for mould materials. Pre-hardened steel (such as PMS), corrosion-resistant steel (such as PCR) and low-carbon maraging steel (such as 18Ni-250) can be used for manufacturing complex, precise and corrosion-resistant plastic moulds, all of which have better cutting, heat treatment and polishing properties and higher strength.
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