Hydro-bending die set for ultra-thin pipe with large diameter-thickness ratio and forming method

Abstract

The invention discloses a hydro-bending die set for an ultra-thin pipe with a large diameter-thickness ratio. The hydro-bending die set comprises an upper die, a lower die, a left end sealing mechanism and a right end sealing mechanism, a to-be-formed pipe is arranged between the upper die and the lower die, elastic edge pressing blocks are arranged at the two ends of the upper die respectively, and the elastic edge pressing blocks and the lower die abut against the end of the pipe in the upper direction and the lower direction respectively. According to the hydro-bending die set for the ultra-thin pipe with the large diameter-thickness ratio, after installation, a liquid inlet pipe and a liquid outlet pipe penetrate through an opening in a right sealing block and then are connected with a liquid inlet pipe nozzle and a liquid outlet pipe nozzle correspondingly to conduct liquid filling and liquid discharging, and when a pipe fitting is bent to cause end displacement of the pipe fitting, a left spring pushes a left plug to move along with the end of the pipe fitting, so that sealing is kept, a right spring pushes a right plug to move along with the end of the pipe fitting, and therefore sealing is kept.

Description

technical field [0001] The invention belongs to the technical field of hydraulically charged bending forming devices, and in particular relates to a hydraulically charged bending die set for ultra-thin pipes with a large diameter-thickness ratio. Background technique [0002] The pipeline system is a key component of the aerospace vehicle. The diameter affects the success or failure of the mission of the aircraft. The elbows with small diameter and thickness ratio can be directly produced by CNC bending technology, while the elbow parts with large diameter and thickness ratio, due to the relative wall thickness It is thinner and cannot use CNC pipe bending technology to achieve pipe bending. [0003] In order to realize the overall forming of parts with a large diameter-thickness ratio and improve the forming quality, the existing technology adopts the filling hydraulic bending forming method to fill the inner cavity of the pipe with a liquid medium with a certain pressure, ...

AI Technical Summary

Problems solved by technology

In this hydraulic bending process, the punch drives the pipe to bend, which will cause two problems. One problem is that the medium in the pipe squeezes the sealing cover of the pipe port during the deformation process. If the sealing cover is pressed out, the seal will fail, thus Therefore, it is necessary to install a thrust mechanism at the pipe fitting port to ensure that the sealing cover is not pressed out; another problem is that during the filling hydraulic bending forming process, the horizontal distance between the two ends of the pipe will be shortened as the punch goes down. The two ends of the pipe will be displaced towards the middle of the pipe, so the thrust mechanism needs to adapt to this displacement to ensure the sealing; the larger the diameter-thickness ratio of the pipe, the more difficult it is to control the above two problems, especially for pipes that require a diameter-thickness ratio of 60 or more In the hydraulic bending forming process of ultra-large-diameter-thick-ratio ultra-thin pipes with a wall thickness of less than 2mm, in addition to the effective sealing of the end cap and the displacement of the end cap, the end cap will fall off due to friction and thrust during the displacement process. Other problems such as mechanism failure, so the requirements for its hydraulic pressure bending are more stringent

In order to achieve bending, it is necessary to add a large number of auxiliary seals and devices to adapt to displacement, which makes clamping and dismounting slow, cumbersome and inefficient, and requires high installation technology. Ordinary operators need to be trained to operate. A series of problems such as low rate

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