An internal high pressure forming system for pipe fittings

Abstract

An intra-pipe high pressure forming system comprises a left liquid charger, a frame, a lift cylinder, a right liquid charger, a lower platform, a front lock clamp cylinder, a front lock clamp, an upper die, an upper stripping cylinder, a lower die, a lower stripping cylinder, a rear lock clamp, a rear lock clamp cylinder and the like. During hydraulic expansion, the front lock clamp and the rear lock clamp can self-lock with contact faces of the upper and lower dies and can tightly contact the dies with no need for actuating lock clamps; with increase of forming pressure, the lock clamps can counteract great forming force, produced by a pipe upon the dies and borne by the lock clamps, through self-elastic deformation; the lock clamps have low elastic deformation, which is ignorable in relation to the elastic deformation of the dies; thus, the upper and lower dies never separate during the forming process, and pipe forming quality is guaranteed. During the whole process, large cylinders for locking are not required, and tonnage and energy consumption of the system is greatly decreased; the system has the advantages such as simple structure, low manufacturing cost, good stability, convenience of control and long die life.

Description

technical field [0001] The invention belongs to the field of internal high pressure forming equipment, in particular to an internal high pressure forming system for pipe fittings. Background technique [0002] At present, with the increasing demand for mechanism integration and light weight in aviation, aerospace, automobile and machinery industries, internal high pressure forming technology has been widely used, and has gradually become a method for manufacturing complex special-shaped cross-section light-body components in industrial production. An advanced forming technology. The inner high pressure forming of pipe fittings is to fill the mold cavity with a certain pressure of forming medium after the upper and lower molds are closed. Cavity, under the joint action of high-pressure forming medium and push head feeding, the tube blank is deformed and fits the mold, so as to realize the forming of pipe fittings, such as tee and cross, etc. [0003] The tube blank is mainl...

AI Technical Summary

Problems solved by technology

Usually, the opening and closing and clamping force of the mold are realized by the same oil cylinder, which results in high pressure maintenance requirements for the equipment, especially for the forming of large-diameter pipe fittings. Due to the large opening and closing stroke of the mold, and the clamping force required for mold clamping is as high as Tens of thousands of tons, resulting in a large scale of the oil cylinder, especially for large-caliber internal high-pressure formed parts, the filling time is long, and the clamping force of the device at the initial stage of forming is relatively small, while the clamping force of the traditional forming device is always unique throughout the process, and It is very large, causing unnecessary waste of resources. At the same time, the clamping force directly acts on the mold during the forming process, and the mold is prone to deformation, resulting in low quality and precision of the pipe fittings and short mold life.

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