T-branch pipe locking type rigid-plasticity combined type bulging equipment

Abstract

The invention discloses T-branch pipe locking type rigid-plasticity combined type bulging equipment. The T-branch pipe locking type rigid-plasticity combined type bulging equipment 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 provided with bulging squeezing punches respectively. The lower half die is provided with an axis branch pipe forming cavity and a balance punch is installed in the branch pipe forming cavity. A rigid bulging inner die is arranged between the two bulging squeezing punches and comprises push rods located at the two ends respectively, and a forming inner die block which is matched with the branch pipe forming cavity and used for driving a pipe blank to bulge and deform is arranged between the two push rods; the forming inner die block is connected with the two push rods through double-hinge connecting rods; the opposite ends of the two push rods are provided with connecting grooves opened towards the branch pipe forming cavity; a limiting structure is arranged in each connecting groove; the push rods are installed in the corresponding bulging squeezing punches respectively in a sliding matching mode, and one of the push rods is provided with a locking type rapid detaching and connecting structure. Thrust devices are arranged at the two ends of the forming cavity and comprise compound hydraulic cylinders.

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 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 pressure t...

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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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