Reduce Engineering Mold Defects In Engineering Plastics

- Jul 28, 2018-

1. Reasonable use of cooling lubricating fluid, play the three main functions of cooling, washing and lubrication, keep cooling and lubrication clean, and thus control the grinding heat within the allowable range to prevent thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as the use of oil-impregnated grinding wheels or internal cooling wheels. The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding zone to exert an effective cooling effect to prevent burns on the surface of the workpiece.

2. The quenching stress after heat treatment is reduced to a minimum, because the quenching stress and the reticulated carbonized structure under the action of the grinding force, the phase change of the structure is extremely easy to cause cracks in the workpiece. For high-precision molds, in order to eliminate the residual stress of grinding, low-temperature aging treatment should be performed after grinding to improve the toughness.

3. Eliminate the grinding stress. The mold can also be immersed in a 260-315 ° C salt bath for 1.5 min, and then cooled in 30 ° C oil, so that the hardness can be reduced by 1 HRC, and the residual stress is reduced by 40% to 65%.