T-branch lock catch type rigidity and plasticity compound bulging forming equipment

Abstract

The invention discloses T-branch lock catch type rigidity and plasticity compound bulging forming equipment which 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, and the two ends of the forming cavity are each provided with a bulging extrusion punch. A branch pipe forming cavity is arranged on the lower half die, and a balance punch is mounted in the branch pipe forming cavity. A rigid bulging inner die is arranged between the two bulging extrusion punches, and comprises push rods located at the two ends of the rigid bulging inner die respectively. A forming inner die block which is matched with the branch pipe forming cavity and used for driving a pipe blank to achieve bulging forming is arranged between the push rods. The forming inner die block and the two push rods are connected through a connecting rod mechanism, the axes of the push rods are in slide fit with the forming cavity, and the push rods are mounted in the corresponding bulging extrusion punches. One push rod is provided with a lock catch type quick-disassembling connection structure, and compound hydraulic cylinders which are 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 are arranged at the two ends of the forming cavity.

Description

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