With the continuous expansion improvement of mold industry, meanwhile, customers’ knowledge is changing and become mature, more and more buyers will also enter the professional field. Would you like to know how to buy high-quality products? GS Machining Co., Ltd. will offer you six major tips you need to know when purchasing products:
- Abrasion resistance of mold parts.
When the raw material is plastically deformed in the mold cavity, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the plastic, which causes the mold to fail due to wear. Therefore, the wear resistance of the material is one of the most basic and important features of the mold.
Hardness is the main factor affecting wear resistance. Generally speaking, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, abrasion resistance is also related to the type, quantity, form, size and distribution of carbides in the material.
2. The toughness of mold parts
Most of the working conditions of the mold are very harsh, and some often bear a large impact load, which leads to brittle fracture. In order to prevent the mold parts from being suddenly break during work, the mold must have high strength and toughness. The toughness of the mold mainly depends on the carbon content, grain size and microstructure of the material.
3. Fatigue fracture performance of mold parts
During the mold working process, under the long-term effects of cyclic stress, fatigue fracture is often caused. Its forms are small energy multiple impact fatigue fracture, tensile fatigue fracture by contacting and bending fatigue fracture. The fatigue fracture performance of a mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performance of mold parts
When the working temperature of the mold is higher, the hardness and strength will be reduced, leading to early wear of the mold or plastic deformation and failure. Therefore, the mold material should have high resistance to tempering to ensure that the mold has higher hardness and strength at the working temperature.
5. Cold and hot fatigue resistance of mold parts
Some molds are repeatedly heated and cooled during the working process, which causes the surface of the cavity to be stretched and pressure to change the stress, which causes surface cracking and peeling, increases friction, hinders plastic deformation, and reduces dimensional accuracy, which leads to Mold failure. Hot and cold fatigue is one of the main forms of failure of hot work molds, and this type of mold should have high cold and hot fatigue resistance.
6. Corrosion resistance of mold parts
Some molds such as plastic molds, due to the presence of chlorine, fluorine and other elements in the plastic, will be separated into strong aggressive gases such as HCI and HF after heating, which will erode the surface of the mold cavity, increase its surface roughness, and increase wear and tear.
For most buyers, due to various reasons, mold parts may be sent to suppliers for processing. At this time, we must determine the reliability of materials and quality when purchasing, so as to create more interests for the company.
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