Rigidity plasticity compound bulging forming device for large-diameter hydraulic-controlled three-way pipe

Abstract

Disclosed is a rigidity plasticity compound bulging forming device for a large-diameter hydraulic-controlled three-way pipe. The device comprises an upper half die and a lower half die; a forming cavity is arranged between the upper half die and the lower half die; bulging extrusion punch heads are installed at the two ends of the forming cavity respectively; a branch pipe forming cavity is designed in the lower half die; a balance punch head is installed in the branch pipe forming cavity; a rigidity bulging inner die is disposed between the two bulging extrusion punch heads; the rigidity bulging inner die comprises push rods located at the two ends respectively; a forming inner die block is disposed between the two push rods; the forming inner die block is connected with the two push rods through double hinge connecting rods; the push rods are mounted in the corresponding bulging extrusion punch heads in a sliding fit mode; bulging liquid inlets and bulging liquid outlets are formed in the bulging extrusion punch heads; one of the push rods is provided with a quick disassembling connecting structure; thrust devices used for driving the bulging extrusion punch heads to slide in the forming cavity and for driving the push rods to slide in the bulging extrusion punch heads are arranged at the two ends of the forming cavity respectively; an auxiliary pressure mechanism is mounted between the two push rods.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipe materials, and in particular relates to a large-caliber liquid-controlled tee pipe rigid-plastic composite bulge 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, accord...

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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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