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What are the main performance requirements of plastic mold
by：CSSSLD
2021-02-03
The main functions of the plastic mould for plastic film processing, mold quality guarantee of the quality of product effect is self-evident.
Different types of plastic products, different product molding process, the mould material, function, shape, have different requirements.
1. Heat resistant function with the emergence of high-speed molding machinery, plastic products production speed. Due to the mold temperature is in commonly 160 ~ 350 ℃, some owe good liquidity, forming speed and fast, can make the mold parts molding surface temperature over 400 ℃ in a very short time. When the mould operating temperature is higher, can make the mold hardness and strength, cause mould early wear or plastic deformation and failure. In order to ensure the precision and deformation of mould when use small, steel should have a higher heat function. How to cut down temperature, die steel should have excellent thermal conductivity and low thermal expansion coefficient.
2. Under the operating temperature is the temperature of the mold operation conditions are very bad, some often accept larger load, and then lead to brittle fracture. Extrusion molding pressure, generally is 10 ~ 35 mpa. Therefore, in order to prevent mould parts in homework when suddenly brittle fracture, the mould has high strength and toughness.
3. Wear resistance with the enlargement of the plastic products use, often need to add in the plastic glass fibers such as inorganic materials to enhance the plastic, as a result of the additives, make plastic liquidity is reduced greatly, cause mould wear and therefore require mould has excellent abrasion resistance.
4. Corrosion resistance to combustion agent is added in the ABS resin and PVC, etc. , may be let out in the process of forming corrosion gas, sometimes in the air stream crossings make mold corrosion and damage, so die steel has excellent corrosion resistance.
5. Outstanding machining function with the plastic products of large-scale, complicated shape and motors, asked to die by steel has excellent machining function, in the process of cutting work hardening. To prevent mold deformation which might affect the accuracy, expect processing control the residual stress can be minimal.
6. Mirror polishing machining mould cavity surface lubrication, formed surface polishing into a mirror, the surface roughness under Ra0. 4 microns, in order to assure the appearance of plastic parts and easy mold release.
7. Dimension precision mould set piece of processing of high precision with high precision, cavity dimension accuracy is commonly 3 ~ 5. Goes all out set the joint cavity closed surface requirement, avoid molten material into the cracks, and cause leakage of material.
8. Speckle picture light corrosion degree function many plastic products in order to beautify the picture added markings on the surface, in the leather industry, application of large leather embossed plate, this require steel has good picture light corrosion.
so, die steel should be satisfied with the strength, hardness, wear resistance, heat resistance, corrosion resistant function; Also should have outstanding with polishing, dimension stability, ease of nitriding and the heat treatment deformation function; Outstanding thermal conductivity and small linear expansion coefficient and other physical function, etc. To the specific requirements of the plastic mold should be based on parts choose different grade of quality and price of the mold steel.
1. Heat resistant function with the emergence of high-speed molding machinery, plastic products production speed. Due to the mold temperature is in commonly 160 ~ 350 ℃, some owe good liquidity, forming speed and fast, can make the mold parts molding surface temperature over 400 ℃ in a very short time. When the mould operating temperature is higher, can make the mold hardness and strength, cause mould early wear or plastic deformation and failure. In order to ensure the precision and deformation of mould when use small, steel should have a higher heat function. How to cut down temperature, die steel should have excellent thermal conductivity and low thermal expansion coefficient.
2. Under the operating temperature is the temperature of the mold operation conditions are very bad, some often accept larger load, and then lead to brittle fracture. Extrusion molding pressure, generally is 10 ~ 35 mpa. Therefore, in order to prevent mould parts in homework when suddenly brittle fracture, the mould has high strength and toughness.
3. Wear resistance with the enlargement of the plastic products use, often need to add in the plastic glass fibers such as inorganic materials to enhance the plastic, as a result of the additives, make plastic liquidity is reduced greatly, cause mould wear and therefore require mould has excellent abrasion resistance.
4. Corrosion resistance to combustion agent is added in the ABS resin and PVC, etc. , may be let out in the process of forming corrosion gas, sometimes in the air stream crossings make mold corrosion and damage, so die steel has excellent corrosion resistance.
5. Outstanding machining function with the plastic products of large-scale, complicated shape and motors, asked to die by steel has excellent machining function, in the process of cutting work hardening. To prevent mold deformation which might affect the accuracy, expect processing control the residual stress can be minimal.
6. Mirror polishing machining mould cavity surface lubrication, formed surface polishing into a mirror, the surface roughness under Ra0. 4 microns, in order to assure the appearance of plastic parts and easy mold release.
7. Dimension precision mould set piece of processing of high precision with high precision, cavity dimension accuracy is commonly 3 ~ 5. Goes all out set the joint cavity closed surface requirement, avoid molten material into the cracks, and cause leakage of material.
8. Speckle picture light corrosion degree function many plastic products in order to beautify the picture added markings on the surface, in the leather industry, application of large leather embossed plate, this require steel has good picture light corrosion.
so, die steel should be satisfied with the strength, hardness, wear resistance, heat resistance, corrosion resistant function; Also should have outstanding with polishing, dimension stability, ease of nitriding and the heat treatment deformation function; Outstanding thermal conductivity and small linear expansion coefficient and other physical function, etc. To the specific requirements of the plastic mold should be based on parts choose different grade of quality and price of the mold steel.
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