Hydraulically controlled type t-branch pipe lock catch type rigidity and plasticity composite bulging device

Abstract

A hydraulically controlled type t-branch pipe lock catch type rigidity and plasticity composite bulging device comprises an upper half die and a lower half die. A forming cavity is formed between the upper half die and the lower half die, and the two ends of the forming cavity are each provided with a bulging extrusion punch. The lower half die is provided with an axis branch pipe forming cavity, and a balancing punch is installed in a branch forming cavity. A rigidity bulging inner die is arranged between the two bulging extrusion punches, the rigidity bulging inner die comprise push rods located at two ends respectively, a forming inner die block is arranged between the two push rods, and the forming inner die block is connected with the two push rods through two hinged connecting rods. The opposite ends of the two push rods are provided with connecting grooves with openings facing the branch pipe forming cavity. Limiting structures used for preventing the axes of the two hinged connecting rods from coinciding are arranged in the connecting grooves. The push rods are installed in the corresponding bulging extrusion punches in a sliding fit mode respectively. A bulging liquid inlet and a bulging liquid outlet are formed in the bulging extrusion punches. One of the push rods is provided with a lock catch type connecting structure capable of being dismounted quickly. The two ends of the forming cavity are each provided with a thrust device.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipes, and in particular relates to a liquid-controlled three-way pipe lock type rigid-plastic composite bulging device. Background technique [0002] There are many types of pipe bulging, mainly divided into two types: rigid bulging and soft mold bulging. Rigid punch bulging is only suitable for bulging of axisymmetric bulging parts that do not require high shape and dimensional accuracy. When liquid, gas or elastomer is used as the pressure transmission medium for bulging, it is commonly called soft mold bulging. The liquid can be oil, emulsion or water, and the elastomer usually adopts polyurethane rubber or natural rubber. Due to its unique characteristics of being easy to be solid or liquid, and recyclable and reusable, paraffin wax is also used as a bulging pressure transmission medium, and has achieved good technical results in production. Therefore, according to the di...

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Problems solved by technology

[0009] Compared with the liquid medium extrusion bulging method, although the plastic medium separation punch extrusion bulging method is more complicated, it avoids the expensive hydraulic pressure boosting system, so it has less equipment investment, high productivity and good forming effect. Good advantages, but it also has a low service life of the punch, a complex mold structure, and cannot be applied to occasions where the size of the tube blank is too small

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