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Plastic mould processing and how to reduce the defect
by：CSSSLD
2021-02-03
Plastic mould processing and how to reduce the defect?
Die editor will tell you the answer.
1, the rational use of cooling lubricant, give play to the role of cooling and cleaning, lubrication, cooling and lubrication to keep clean, control of grinding heat within the scope of the permit, to prevent thermal deformation. Improve the cooling conditions when grinding, such as immersion oil sands or cold grinding wheel. Center of introducing cutting fluid abrasive cutting fluid directly into the grinding zone, effective cooling effect, prevent the workpiece surface burn.
2, after heat treatment of quenching stress to a minimum, quenching stress, reticulate carbide organization under the action of the grinding force, organization change the artifacts produced cracks easily. High precision mould in order to eliminate the residual stress of the grinding, grinding should be done after low temperature aging treatment, improve the toughness.
3, eliminate grinding stress, in 260 ~ 315 ℃ in the salt bath soak 1. 5 min, in 30 ℃ oil cooling, fell 1 HRC hardness, residual stress by 40% ~ 65%.
4, dimension tolerance is less than 0. 01 mm precision mold precision grinding attention should be paid to the influence of environment temperature, requires constant temperature. According to the calculation, 300 mm long steel, when the temperature is 3 ℃, material has 10. The change of around 8 microns ( 10. 8 = 1. 2 * 3 * 3, each 100 mm deformation of 1. 2μm/℃) , every process need to fully consider the influence of the factors.
5, the electrolytic grinding processing, improve the mould manufacturing precision and surface quality. Electrolytic grinding, grinding to remove oxide film, not grinding metal, so small grinding force, grinding heat is small, not happen the phenomenon such as grinding burrs, cracks, burns, the surface roughness is better than that of Ra0 commonly. 16 microns, in addition, the grinding wheel configuration is small, such as grinding hard alloy, silicon carbide grinding wheel grinding amount is about 400% ~ 600% of grinding hard alloy weight, electrolytic grinding, grinding wheel grinding quantity was only 50% ~ 100% of the hard alloy grinding.
1, the rational use of cooling lubricant, give play to the role of cooling and cleaning, lubrication, cooling and lubrication to keep clean, control of grinding heat within the scope of the permit, to prevent thermal deformation. Improve the cooling conditions when grinding, such as immersion oil sands or cold grinding wheel. Center of introducing cutting fluid abrasive cutting fluid directly into the grinding zone, effective cooling effect, prevent the workpiece surface burn.
2, after heat treatment of quenching stress to a minimum, quenching stress, reticulate carbide organization under the action of the grinding force, organization change the artifacts produced cracks easily. High precision mould in order to eliminate the residual stress of the grinding, grinding should be done after low temperature aging treatment, improve the toughness.
3, eliminate grinding stress, in 260 ~ 315 ℃ in the salt bath soak 1. 5 min, in 30 ℃ oil cooling, fell 1 HRC hardness, residual stress by 40% ~ 65%.
4, dimension tolerance is less than 0. 01 mm precision mold precision grinding attention should be paid to the influence of environment temperature, requires constant temperature. According to the calculation, 300 mm long steel, when the temperature is 3 ℃, material has 10. The change of around 8 microns ( 10. 8 = 1. 2 * 3 * 3, each 100 mm deformation of 1. 2μm/℃) , every process need to fully consider the influence of the factors.
5, the electrolytic grinding processing, improve the mould manufacturing precision and surface quality. Electrolytic grinding, grinding to remove oxide film, not grinding metal, so small grinding force, grinding heat is small, not happen the phenomenon such as grinding burrs, cracks, burns, the surface roughness is better than that of Ra0 commonly. 16 microns, in addition, the grinding wheel configuration is small, such as grinding hard alloy, silicon carbide grinding wheel grinding amount is about 400% ~ 600% of grinding hard alloy weight, electrolytic grinding, grinding wheel grinding quantity was only 50% ~ 100% of the hard alloy grinding.
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