Why is the dimensional accuracy of molded plastic parts much lower than the accuracy of machined products?
Because the plastic parts in the production process has obvious phenomenon of thermal expansion and contraction, mold design and manufacture in human made amplification processing, the magnification according to the important performance index of plastic shrinkage rate, which is a statistical index, and unstable. Therefore, the precision of plastic products is lower than that of machined products by 1~2 grades.
Therefore, the precision of plastic products is lower than that of machined products by 1~2 grades.
Because the plastic parts in the production process has obvious phenomenon of thermal expansion and contraction, mold design and manufacture in human made amplification processing, the magnification according to the important performance index of plastic shrinkage rate, which is a statistical index, and unstable.
