I am the workshop manager. When injection molding products are changed to injection molding machines of different manufacturers, the parameters are always different and will not correspond to the parameters specified in the work instructions. The adjustment of each injection molding machine is different. For example, the maximum injection pressure is 170Mpa. Theoretically, 50% injection pressure should be 85Mpa. However, because the proportional valve is different from the driving circuit and the adjustment time is different, it is difficult to achieve absolute linearity. Therefore, changing equipment (especially different manufacturers and models) will definitely lead to different molding parameters. The method is to find a way to calibrate the equipment, especially the equipment with the biggest deviation. Mainly to calibrate pressure and speed.