Method and system for intelligent judgment and accurate compensation of hydroforming liquid leakage

Abstract

The invention relates to a method and system for intelligent judgment and accurate compensation of hydroforming liquid leakage, comprising: real-time measurement of the first liquid pressure of the liquid in the outlet pipeline of the high-pressure chamber of the supercharger; the outlet of the high-pressure chamber of the supercharger passes through the high-pressure pipe The road is connected to one end of the first punch, the other end of the first punch is connected to one end of the pipe, and the other end of the pipe is connected to the second punch; real-time measurement of the second punch in the channel of the first punch liquid pressure; measuring the third liquid pressure in the second punch channel in real time; judging the liquid leakage position according to the drop time and change speed of the first liquid pressure, the second liquid pressure and the third liquid pressure. According to the real-time measurement of the liquid pressure at the outlet of the high-pressure chamber of the supercharger and at both ends of the pipe, and judge the liquid leakage position according to the change of the measured liquid pressure, so as to realize the judgment of the liquid leakage position in the internal high pressure forming.

Description

technical field [0001] The invention relates to the technical field of pipe plastic forming, in particular to a method and system for intelligent judgment and accurate compensation of hydroforming liquid leakage. Background technique [0002] Internal high pressure forming technology is an advanced pipe forming process. Its principle is to apply liquid pressure and axial force to the pipe, according to the preset displacement-liquid pressure loading curve, so that the pipe is plastically deformed and attached to the mold cavity, forming the desired shape. Fittings of desired shape. When forming, the mold is placed on the table of the clamping press, and the mold is opened and closed by the clamping press, and the mold clamping force is applied, and the axial force is provided by the horizontal cylinder to realize the sealing of the pipe end and the axial feeding of the pipe end. The diameter of the sealing section of the axial punch is larger than the inner diameter of the ...

AI Technical Summary

Problems solved by technology

[0007] 1) Leakage can be judged only when the volume of liquid discharged from the high-pressure chamber of the supercharger is greater than the difference between the volume of the final formed pipe and the original pipe, and when the leakage is small and does not exceed the difference, the control system cannot tell whether it has occurred leakage

[0008] 2) There are several possibilities for high-pressure liquid leakage in internal high pressure forming: (1) Leakage at the left pipe end; (2) Leakage at the right pipe end; (3) Micro cracks in the pipe fittings; (4) Supercharger Leaks exist in high-pressure pipelines or joints, but the existing patented method can only determine the liquid leakage during the forming process, but cannot determine the specific location of the leakage

[0009] 3) After the existing method judges the occurrence of liquid leakage, the compensation and sealing scheme adopted is that the punches at both ends of the pipe are fed axially at the same time. For the two cases of high-pressure pipeline joint leakage and pipe micro-cracks, axial feed compensation cannot solve the problem of liquid leakage. Leakage problem; for the end of the pipe fitting without leakage, due to the excessive axial feed, it is easy to cause the compression instability of the pipe at this end

[0010] 4) After the axial feed compensation seal is performed at both ends of the pipe at the same time, since the specific value of the liquid leakage cannot be obtained, it is impossible to judge whether the liquid leakage problem has been solved by the change of the liquid volume again, and the control system cannot judge whether it is at this time based on the liquid volume. micro leaks still exist

[0011] In summary, the existing methods cannot accurately determine the location of the micro-leakage during internal high-pressure forming, nor can it determine whether the micro-leakage of the liquid is caused by the leakage of the pipe end punch or the micro-cracks of the pipe. Obtaining the actual sealing effect after punch axial feed compensation, the judgment method is not intelligent and accurate enough, and a new method needs to be proposed to intelligently judge the micro-leakage phenomenon during internal high pressure forming, and to be able to perform accurate sealing compensation, so as to improve the internal high pressure forming products Pass rate

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