Product diagram of motor mounting box is shown in Figure 1. Maximum size of product is 209.48 mm * 168.40 mm * 138. 15mm, average thickness of plastic part is 2.40mm, material of plastic part is fireproof ABS, shrinkage rate is 1.005, and weight of plastic part is 235.70 grams. Technical requirements for plastic parts are that there must be no defects such as peaks, underfilling of injection molding, flow lines, pores, warpage deformation, silver streaks, cold materials, jet lines, etc.