There is no weld mark between the ports 1 and 3, which eliminates the defect of the weld mark phenomenon between the gate melt of the ordinary mold. Product performance and apparent quality are really because the design of the program control valve eliminates the phenomenon of product welding marks, so the strength and apparent quality of the product have been greatly improved. At the same time, because of the use of the program control valve, the melt runs very well in the cavity. Less affected by cold material factors, so relatively speaking, the pressure and melt temperature during injection molding can be set much lower than ordinary gates, which also reduces the presence of internal stress in the product and the degradation of the product caused by high temperature Threatened. Equipment and its requirements Because the use of program control valves can reduce the injection pressure, for the same product, the same shape, the same projected area, and different injection pressures require different clamping forces, so the program control valve mold The requirements for the clamping force of the injection molding machine for the manufactured products are much lower than the requirements for the injection molding machine of the ordinary gate mold. Of course, the program control valve injection mold also has special requirements for the injection molding equipment, it needs a set of control system to control the operation of the program valve. 3 Application analysis of injection program control valve in automobile products 3.1 Application of ordinary gate mold in automobile injection products The application of automobile injection products is becoming more and more extensive, and the requirements for product performance and apparent quality are getting higher and higher. . Car bumpers are a good example. In the past, automobile bumpers were made of metal stamping and electroplating, which were heavy in weight and not environmentally friendly. Therefore, more and more automobile manufacturers switched to plastic injection molding bumpers. Ordinary injection bumper molds used ordinary multiple SAIC gate shapes in the past. Cylinder piston c () 4, D2 thimble 4) 14, calculate how much pressure the hydraulic cylinder needs to make the gate open/close normally during injection molding. Therefore, the hydraulic cylinder method is used for injection molding pressure below 100kg/cm2, the hydraulic pressure is 40kg /rm2 is sufficient.