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How To Reduce Defects In Plastic Mold Processing Oct 28, 2017

1, reasonable use of cooling lubricant, play cooling, washing, lubrication of the three major role, keep the cooling and lubrication clean, so as to control the grinding heat in the allowable range, in order to prevent thermal deformation of the workpiece. To improve the grinding cooling conditions, such as the use of oil or cooling measures such as grinding wheel. The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can enter the grinding zone directly, and play an effective cooling effect to prevent the surface burn of the workpiece.

2, the quenching stress after heat treatment is reduced to a minimum, because the quenching stress and the network carbide structure under the action of grinding force, the phase transformation of the tissue is easy to cause cracks in the workpiece. In order to eliminate the residual stress in the grinding of high precision die, low temperature aging treatment should be carried out after grinding to improve the toughness.

3. To eliminate grinding stress, the mold can be soaked in 1.5min salt bath at 260~315 DEG C and then cooled at 30 DEG C, so that the hardness can be reduced by 1HRC, and the residual stress can be reduced by 40% ~ 65%.

4. For the precision grinding of precision mould with dimension tolerance of less than 0.01mm, attention should be paid to the influence of ambient temperature, and constant temperature grinding is required. It can be seen from calculation that when the temperature difference is 3 degrees centigrade, the material with 300mm length has a change of about 10.8 m, (10.8=1.2 x 3 x 3, the amount of deformation per 100mm is 1.2 m/), and each finishing process needs to take into account the influence of this factor.

5, electrolytic grinding is adopted to improve the manufacturing accuracy and surface quality of the die. Electrolytic grinding, grinding and scraping film: instead of grinding metal, thus grinding force, grinding heat is small, does not produce grinding burr, crack, burns and other phenomena, the general surface roughness can be better than Ra0.16 m; in addition, the small wheel wear, such as grinding hard alloy, silicon carbide grinding wheel wear around for hard alloy grinding off the weight from 400% to 600%, with electrolytic grinding, grinding wheel wear of the hard alloy grinding only the amount of 50% to 100%.