Large-diameter hydraulic control type T-branch pipe rigid-plasticity combined bulging forming die

Abstract

The invention discloses a large-diameter hydraulic control type T-branch pipe rigid-plasticity combined bulging forming die. The large-diameter hydraulic control type T-branch pipe rigid-plasticity combined bulging forming die comprises an upper half die and a lower half die, wherein a tubular forming cavity is arranged between the upper half die and the lower half die; the two ends of the forming cavity are provided with bulging squeezing punches respectively in a sliding matching mode; the lower half die is provided with a branch pipe forming cavity, the axis of the branch pipe forming cavity and the axis of the forming cavity perpendicularly intersect, 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 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 axes of the push rods are parallel to the axis of the forming cavity, and the push rods are installed in the corresponding bulging squeezing punches respectively in a sliding matching mode; a bulging liquid inlet and a bulging liquid outlet are formed in each bulging squeezing punch; one of the push rods is provided with a rapid detachment and connecting structure; an auxiliary pressure mechanism is arranged between the two push rods.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipes, and in particular relates to a large-diameter liquid-controlled three-way pipe rigid-plastic composite bulge forming mold. 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 ...

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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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