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Precision injection molding and manufacturing heat treatment process
by：CSSSLD
2021-01-23
In the process of heat treatment, precision injection mold deformation often, but in order to prevent this kind of undesirable phenomenon, if you understand the regularity of deformation, please analysis the reason and change the way to prevent the deformation of mould.
Can inhibit the deformation of the mould.
Precision injection mold heat treatment deformation under normal conditions of controlled, can through the following methods to prevent.
( 1) Reasonable selection of materials: for precision injection molds, must choose good micro deformation of the steel material. Serious segregation of carbide die steel need to be cast in an appropriate manner. Large cannot be cast die steel can be solid solution double refining treatment.
。 。
( 2) The mould structure design should be appropriate, thickness should not be too big, the shape should be symmetrical. For large deformation of mold, must understand the deformation law and ensure the machining allowance. For large precision injection mold, you can use the composite structure.
( 3) Need to preheat the precision injection molds, in order to eliminate residual stress occurring in the process of machining.
( 4) Correct selection of heating temperature and heating rate. For precision injection molds, you can use the slow heating, heating and other heat balance method to reduce the mold heat treatment deformation.
( 5) While to ensure that the mold hardness, precooling of injection mold cooling or quenching temperature gradient.
( 6) Allows for precision injection molds, in the premise, under the condition of using vacuum heating and quenching, and cryogenic treatment after quenching.
( 7) For some complex mould, can be used to preheat treatment, aging heat treatment, tempering and nitriding heat treatment to control the precision of the mould.
( 8) Repair mold blister, porosity, wear and other defects, please use the cold welding machine or other repair equipment is not sensitive to temperature, so as to avoid deformation in the process of repair. 。
there are many ways of heat treatment process, such as closed hole, connecting hole, machinery is fixed, the appropriate heating method, the direction of the mold cooling and cooling medium direction accurately. Reasonable tempering heat treatment process and reduces the precision injection molding rate. Effectively prevent the deformation of mould.
plastic household plastic products mainly has the following several kinds of raw materials, For example, some raw materials) 。
PP: low transparency, low gloss, low rigidity, low impact strength, usually in a plastic bucket, plastic basin, folder, found in drinking water pipe and so on.
PC: high transparency, high gloss, very fragile, often used for water bottles, space cup, baby bottles and other plastic bottles.
ABS: resin is one of the five main synthetic resin. It has excellent impact resistance, heat resistance, low temperature resistance, chemical resistance, injection molding processing and performance. In addition, it is easy to processing, product size stability, good surface gloss. Mainly used in baby bottles, space cup, automobile, etc.
PE: main products are bottled mineral water bottles, PE fresh-keeping mould, milk bottles, etc.
PVC: mainly used in plastic bags, packaging bags, drain, etc.
PS: mainly used in printers, shell and electrical equipment shell.
all plastic products have different color, and mixed with the pigments. It is also a technical core plastic products. If the color ratio is good, product sales is very good, the boss also attaches great importance to. The privacy of color matching.
in general, the raw material for the plastic product mix. For example, ABS has good iuster, pp with good resistance to drop, and PC with high transparency. Due to the nature of each raw material mix proportion and introduced new products, but they are usually not used in the food. Tool.
today, is made by injection or blow molding plastic products, so every time design samples have to open a new mold, mold range is usually between tens to hundreds of thousands. In addition to the price, plastic mould cost is high, a lot of parts made from the finished product, every parts need to separate the mold.
( 1) Reasonable selection of materials: for precision injection molds, must choose good micro deformation of the steel material. Serious segregation of carbide die steel need to be cast in an appropriate manner. Large cannot be cast die steel can be solid solution double refining treatment.
。 。
( 2) The mould structure design should be appropriate, thickness should not be too big, the shape should be symmetrical. For large deformation of mold, must understand the deformation law and ensure the machining allowance. For large precision injection mold, you can use the composite structure.
( 3) Need to preheat the precision injection molds, in order to eliminate residual stress occurring in the process of machining.
( 4) Correct selection of heating temperature and heating rate. For precision injection molds, you can use the slow heating, heating and other heat balance method to reduce the mold heat treatment deformation.
( 5) While to ensure that the mold hardness, precooling of injection mold cooling or quenching temperature gradient.
( 6) Allows for precision injection molds, in the premise, under the condition of using vacuum heating and quenching, and cryogenic treatment after quenching.
( 7) For some complex mould, can be used to preheat treatment, aging heat treatment, tempering and nitriding heat treatment to control the precision of the mould.
( 8) Repair mold blister, porosity, wear and other defects, please use the cold welding machine or other repair equipment is not sensitive to temperature, so as to avoid deformation in the process of repair. 。
there are many ways of heat treatment process, such as closed hole, connecting hole, machinery is fixed, the appropriate heating method, the direction of the mold cooling and cooling medium direction accurately. Reasonable tempering heat treatment process and reduces the precision injection molding rate. Effectively prevent the deformation of mould.
plastic household plastic products mainly has the following several kinds of raw materials, For example, some raw materials) 。
PP: low transparency, low gloss, low rigidity, low impact strength, usually in a plastic bucket, plastic basin, folder, found in drinking water pipe and so on.
PC: high transparency, high gloss, very fragile, often used for water bottles, space cup, baby bottles and other plastic bottles.
ABS: resin is one of the five main synthetic resin. It has excellent impact resistance, heat resistance, low temperature resistance, chemical resistance, injection molding processing and performance. In addition, it is easy to processing, product size stability, good surface gloss. Mainly used in baby bottles, space cup, automobile, etc.
PE: main products are bottled mineral water bottles, PE fresh-keeping mould, milk bottles, etc.
PVC: mainly used in plastic bags, packaging bags, drain, etc.
PS: mainly used in printers, shell and electrical equipment shell.
all plastic products have different color, and mixed with the pigments. It is also a technical core plastic products. If the color ratio is good, product sales is very good, the boss also attaches great importance to. The privacy of color matching.
in general, the raw material for the plastic product mix. For example, ABS has good iuster, pp with good resistance to drop, and PC with high transparency. Due to the nature of each raw material mix proportion and introduced new products, but they are usually not used in the food. Tool.
today, is made by injection or blow molding plastic products, so every time design samples have to open a new mold, mold range is usually between tens to hundreds of thousands. In addition to the price, plastic mould cost is high, a lot of parts made from the finished product, every parts need to separate the mold.
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