T-branch pipe lock catch type rigidity and plasticity composite bulging forming device

Abstract

The invention discloses a t-branch pipe lock catch type rigidity and plasticity composite bulging forming device which 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. The two ends of the forming cavity are each provided with a bulging extrusion punch. The lower half die is provided with a branch pipe forming cavity, and a balancing punch is installed in the branch pipe forming cavity. A rigidity bulging inner die is arranged between the two bulging extrusion punches, and the rigidity bulging inner die comprises push rods located at two ends respectively. A forming inner die block is arranged between the two push rods, matched with the branch pipe forming cavity and used for driving a pipe billet to bulge and deform. The forming inner die block and the two push rods are connected through a connecting rod mechanism. The axes of the push rods are parallel to the axis of the forming cavity and the push rods are installed in the corresponding bulging extrusion punches in a sliding fit mode respectively. 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 provided with thrust devices used for driving the bulging extrusion punches to slide in the forming cavity and used for driving the push rods to slide in the bulging extrusion punches respectively.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipes, and in particular relates to a three-way pipe lock-type rigid-plastic composite bulging forming 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 different pr...

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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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