Method and device for forming uniform wall thickness of internal high-pressure tee pipe

Abstract

The invention discloses a method and device for uniformly forming the wall thickness of an internal high-pressure tee pipe. The method includes the following steps: cutting off a pipe corner at both ends of the pipe blank; The phantom with the branch pipe cavity is fitted, the outer wall of the straight pipe on the side of the pipe corner cut off from the tube blank is fitted with the phantom without the branch pipe cavity; during internal high pressure forming, install it on the left push head and the right push head respectively A detachable sealing head, which makes the detachable sealing head seal with the inner wall of the tube blank. The device includes an upper phantom, a lower phantom, a detachable sealing head, a forming cavity, a branch pipe hole and an ejector rod, and a detachable sealing head is connected to the front end of the left push head and the right push head respectively, and the detachable sealing head and the tube blank use the above-mentioned method designed. The invention can improve the overall wall thickness uniformity of the formed tee pipe straight pipe through the improvement of the design of the shape of the pipe blank and the improvement of the device.

Description

technical field [0001] The invention relates to the technical field of internal high-pressure forming, in particular to a method and a device for forming a uniform wall thickness of an internal high-pressure tee pipe. Background technique [0002] The tube internal high pressure forming process is an advanced forming method that uses axial feeding and internal pressure to make the tube blank fit on the surface of the cavity. Compared with the traditional stamping process, the internal high pressure forming process has obvious technical and economic advantages in reducing weight, reducing the number of parts and molds, improving rigidity and strength, and reducing production costs. At the same time, it has near-net shape and green manufacturing. Features. [0003] The forming process of internal high pressure is to close the upper and lower molds on the hydraulic press, fill the pipe cavity with liquid medium, and the two push heads placed at 180° are simultaneously fed to t...

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Problems solved by technology

[0004] However, when using the high pressure forming process in the pipe to make the tee pipe, the experiment shows that the tee pipe formed by this forming method still has substantial defects.

In the initial stage of forming, the material in the straight pipe area close to the cavity of the branch pipe of the tee moves into the cavity of the branch pipe, resulting in a decrease in the wall thickness of the straight pipe on the side of the tee pipe with the branch pipe; and during the forming process, due to the internal pressure Slower increase and faster increase in feed rate will cause material to accumulate in the straight pipe area opposite the branch pipe and increase the wall thickness

Therefore, after forming, the wall thickness of the straight pipe on the opposite side of the branch pipe is obviously greater than that of the straight pipe on the side with the branch pipe, which reduces the wall thickness uniformity and structural properties of the tee pipe, resulting in a lower forming rate

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