Injection mold is a tool for producing plastic products, and also a tool for the complete structure and precise size of plastic products.Injection molding is a kind of machining method used in batch production of certain kinds of complex parts.Specifically, the molten plastic is injected into the cavity by the injection molding machine. After cooling and curing, the plastic is obtained.
- The molding parts refer to the mould parts, such as cavity, core, sliding block, insert, slant and side suction, which are directly exposed to plastic..
2, the material of parts is directly related to the mold, the quality of life, decide the molding plastic products by the appearance and intrinsic quality, must be very careful, will make the contract regulations and customer requirements, on the basis of selected according to requirements and characteristics of products and molds.
3, molding principle is: material selection of parts according to the types of plastic molding, products shape, size precision, appearance quality of products and use requirement, production batch size, etc., both material cutting, polishing, welding, corrosion, deformation, wear-resisting performance, at the same time considering economy and mould manufacturing conditions and processing method, to choose different types of steel.
4, for forming a transparent plastic products mold, the mold cavity and core all needs to choose high mirror polishing performance of high-grade imported steel, such as 718 (P20 + Ni), NAK80 (P21), S136 (420 class), H13 steel, and so on, of which 718, NAK80 for hard state, does not need to heat treatment again;S136 and H13 steel are annealed state, the hardness is commonly HB160-200, need to have the vacuum quenching and tempering treatment after rough machining, S136 hardness is commonly HRC40-50, the hardness of H13 steel is commonly HRC45-55 (can be determined according to specific brand).
- For the high quality requirements, long life and mass production of molds, the selection of the molding parts and components is as follows:
- The high quality imported steel with high specular polishing performance should be selected in the shape cavity, such as 718(P20+Ni class) and NAK80 (P21) etc., all of which are pre-hard, no heat treatment is required.
- The type core can be used to import P20 or P20+Ni type steel, such as 618, 738, 2738, 638, 318, etc.For the production of small batches of small molds, we can also choose domestic plastic mold steel or S50C, S55C and other imported high-quality carbon steel.
- For the general mold of product appearance quality, the selection of the molding parts and components is as follows:
A, small, precision mold cavity and core are all imported from mid-range P20 or P20+Ni type steel.
- Large and medium mold, the molded plastic has no special requirements for the steel, and the cavity can be used to import P20 or P20+Ni type steel.Type core can choose low grade imported P20 type of steel or imported high-quality carbon steel S50C, S55C, etc., also can choose domestic plastic mold steel.C) for the cavity of the etched lines, the P20+Ni class of 2738(738) should be avoided when the rims are cut.
- For the internal structure of the non-exterior quality, the molding material has no special requirements for the steel, and its forming parts and components are selected as follows:
- For large and medium sized moulds, low-grade imported P20 or P20+Ni type steel can be used in the cavity, or imported high-quality carbon steel S55C, S50C or domestic P20 or P20+Ni type plastic mold steel;Type core can choose imported or domestic high-quality carbon steel.
- For small molds, if the output is higher and the structure is more complicated, the cavity can be used for low-grade import P20 or P20+Ni type steel, or domestic P20 or P20+Ni type plastic mold steel.Type core can choose domestic plastic mold steel.
- For small molds with simple structure and low yield, domestic plastic mold steel or high quality carbon steel can be used in the cavity core.
8, containing fluorine, chlorine and other corrosive for molding plastic and all kinds of adding flame retardant plastic mould, if the high requirements of products, can choose imported corrosion resistant steel, general requirements can choose domestic corrosion-resistant steel.
9, for the forming of steel has strong friction, impact of plastic mold, such as nylon + glass fiber materials used for injection mould, should choose high wear-resisting, high thermal advantages of high tensile strength and toughness of imported or domestic H13 steel.
- The molding inserts are usually made of the same materials as the parts that are inserted.For parts that are more difficult to cool down or require a higher cooling effect, beryllium bronze or aluminum alloy shall be used for inserts.
- The selection principle for the material selection of the components in the mold is as follows:
- Transparent parts should be made of polished and high-grade imported steel, such as 718, NAK80, etc.
B, opaque, generally should choose the hardness and strength of high middle-grade imported steel, such as 618, 738, 2738, 738, 618, such as surface nitriding processing, nitriding depth of 0.15-0.15 mm, hardness of HV700-900.
- If the molds are low, the low grade imported steel or domestic steel can be selected, and the hardness of the nitriding treatment is generally hv600-800.
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