Barrel temperature and nozzle temperature \x0d\ Because ABS contains butadiene, its heat resistance is not high, barrel temperature should not be too high, and heating time should not be too long, otherwise ABS will easily change color. When the injection temperature is high, the tensile strength of the oriented molecules decreases slightly due to the disorder of orientation. Therefore, in general, when the feed temperature and nozzle temperature can meet the liquidity requirements, they should be set as low as possible. The set temperature is shown in Table 2. \x0d\ Table 2 Forming temperature \x0d\ barrel temperature in each stage/℃ \ x0d \ The mold temperature of ABS is generally set to 75 ~ 85℃, the fixed mold temperature is set to 70 ~ 80℃, and the moving mold temperature is set to 50 ~ 60℃, which is to prevent the front mold (that is, the fixed mold) from sticking to the mold. In addition, the high temperature of the fixed mold makes ABS have good fluidity in the gating system, which is beneficial to mold filling. However, the low temperature of the moving die is beneficial to shorten the cooling time and improve the production efficiency. Special heating should be considered when injecting large, complex and thin-walled parts. In order to shorten the production cycle and keep the mold temperature relatively stable, cold water bath, hot water bath or other mechanical forming methods can be used to compensate the cooling time of the parts in the mold cavity after they are taken out. \x0d\3-33-3 Injection pressure and holding pressure \ x0d \ The viscosity of ABS melt is higher than that of polystyrene or modified polystyrene, so the injection pressure is higher. Of course, not all ABS parts need high pressure, and low injection pressure can be used for small parts with simple structure and large thickness, which can be selected within the range of 70 ~ 100 MPa; The injection pressure of complex, thin-walled, long-flow and small-gate products can be increased to 100 ~ 140 MPa. In the process of injection molding, the pressure in the mold cavity at the moment of gate closing often determines the surface quality of the parts and the degree of silver filiform defects. If the pressure is too small, the plastic will shrink greatly, and there is a great chance that it will leave the surface of the cavity, and the surface of the product is easy to atomize. When the pressure is too high, the friction between the plastic and the surface of the mold cavity is strong, which is easy to cause mold sticking and scratching. Moreover, the pressure is too high, which easily leads to excessive internal stress in the product. Generally, injection-molded products are anisotropic, that is, the performance in the flow direction is different from that in the vertical flow direction, which is caused by the orientation during injection molding. If the injection pressure is too high, it will inevitably lead to the increase of two-way performance difference. \x0d\ Holding pressure is controlled at 60 ~ 70 MPa, which can meet the requirements of products and molding.