Internal high-pressure forming machine with variable mold clamping force and internal high-pressure forming processing method

Abstract

The invention discloses an internal high-pressure forming machine with variable mold clamping force. The internal high-pressure forming machine comprises a machine body, a hydraulic system and a liquid-filled system, wherein a long-stroke oil cylinder is arranged on the upper part of the machine body, and an upper sliding block is connected to the front end of a piston rod of the long-stroke oil cylinder; an upper die is installed on the lower surface of the upper sliding block; a short-stroke oil cylinder is arranged at the bottom of the machine body, the short-stroke oil cylinder comprises a plunger oil cylinder and four auxiliary piston oil cylinders, a lower sliding block is installed on the upper end of the short-stroke oil cylinder, and a lower die is installed on the upper surface of the lower sliding block; horizontal positioning oil cylinders are respectively installed on the left and right side walls of the upper part of the machine body, and positioning blocks are installed on the front ends of piston rods of the horizontal positioning oil cylinders; axial feeding oil cylinders are respectively installed on the left and right side walls of the lower part of the machine body, and sealing punches are installed on the front ends of piston rods of the axial feeding oil cylinders; a pressure cylinder is arranged on the liquid-filled system; the hydraulic system is used for supplying working media for driving all of the oil cylinders to operate. The invention further discloses an internal high-pressure forming processing method. According to the internal high-pressure forming machine, the mold clamping force can change according to a given load curve as the internal high pressure of a tube changes, so that the quality of a formed part and the production efficiency are increased.

Description

technical field [0001] The invention relates to an internal high pressure forming machine and a processing method, in particular to an internal high pressure forming machine with variable clamping force and an internal high pressure forming processing method. Background technique [0002] At present, the internal high-pressure forming technology uses high-pressure liquid as a medium, and uses the combined action of the axial feeding force at both ends of the pipe and the internal high-pressure bulging of the pipe to form the pipe into the desired shape in the mold. A new processing technology. Compared with the traditional forming method, this forming method has a series of advantages such as reducing the weight of the workpiece, improving the utilization rate of materials and reducing the manufacturing cost. [0003] The internal high pressure forming machine is the equipment to realize the internal high pressure forming of the tube blank, mainly including the clamping pres...

AI Technical Summary

Problems solved by technology

For large-tonnage internal high-pressure forming machines, this mold clamping method requires the mold clamping press to be in a high-pressure state for a long time, which will not only seriously waste hydraulic energy, but also cause certain damage to various hydraulic components.

In the initial stage of the forming process, the internal liquid pressure of the pipe is very low, and the maximum mold clamping force acts almost entirely on the contact surface of the upper and lower molds, so the design size of the mold is required to be large, and long-term work will lead to deformation and destruction of the mold, increasing the manufacturing of the mold cost

At the same time, the constant maximum clamping force often causes high friction between the tube blank and the mold surface, making it difficult to feed and feed the tube parts, making parts with thin walls, large deformation, and complex shapes prone to cracking, and reducing the quality of formed parts and production efficiency

The traditional internal high pressure forming machine always maintains the maximum clamping force during the forming process, resulting in energy waste, deformation and damage of the mold, resulting in low product quality and production efficiency

Images