Custom Highly Precision Injection Moulding Parts

Precision mold parts performance requirements 1. Strength and toughness High precision mold and tool components often work under harsh condition. Some usually bear a large impact load, resulting in brittle fracture. Thus, precision molds should have high strength and toughness. It’s to prevent mold components from breaking suddenly during working. And the toughness of the mold and tool mainly depends on the carbon content, grain size, and microstructure of the material. 2. Fatigue fracture performance The fatigue fracture always happens when the high precision plastic injection mold parts are working. It’s because of the long-term effects of cyclic stress. The forms include multiple impact with small energy, stretch, contact, and bending fatigue frature. In general, this property of custom molding and tooling depends on these factors. Like its strength, toughness, hardness, and inclusions content in the material.

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3. High-temperature performance When the working temperature of precision molding and tooling is higher, the hardness and strength will decrease. And it results in early mold wear or failure by plastic deformation. Thus, the mold material should have high tempering stability. It can ensure that the mold has a high hardness and strength in the working temperature.4. Resistance to cold and heat fatigue Some molds are in the state of repeated heating and cooling in the working process. Then, it causes the surface of the cavity to be pulled and stressed, resulting in the surface crack and peel off. As a result, it increases the friction force. Beside, it prevents the plastic deformation and reduces the dimensional precision. Finally, it leads to the failure of the mold. Cold and hot fatigue is one of the primary forms of hot working tool failure.5. Corrosion resistance In the working process of some molds, like plastic injection molding, they produce strongly aggressive gas. Because there are chlorine, fluorine, and other elements in the plastic, they decompose and precipitate HCI and HF. They erode the cavity surface, increase the surface roughness and aggravate the wear failure.

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