It is mainly applicable to the stretching, blanking (buffer device must be set), bending, flanging, cold extrusion and other processes of plastic materials, and can also be engaged in correction, pressing, cold extrusion parts, grinding wheel forming, plastic products forming. This series of products have four columns or frame structure, the machine's pressure, no load down and deceleration stroke can be adjusted according to the needs of the process in a certain range, and can complete the top cylinder ejection, no ejection, stretching three processes. Each process can realize the constant pressure molding or the constant process molding process, the constant pressure molding process with the rolling time and automatic return function, to meet a variety of process molding requirements, widely used in auto parts, home appliances, hardware and other industries.