Rigid and plastic compound bulging forming die for large-caliber T-branch pipe

Abstract

The invention discloses a rigid and plastic compound bulging forming die for a large-caliber T-branch pipe. The rigid and plastic compound bulging forming die comprises an upper half die and a lower half die. A forming cavity in a circular pipe shape is formed between the upper half die and the lower half die. Bulging squeezing punches in sliding fit with the forming cavity are mounted at the two ends of the forming cavity respectively. The lower half die is provided with a branch pipe forming cavity with the axis perpendicularly intersecting with the axis of the forming cavity, and a balance punch is mounted in the branch pipe forming cavity. A rigid bulging inner die is arranged between the two bulging squeezing punches and comprises pushing rods located at two ends respectively. A forming inner die block is arranged between the two pushing rods, matched with the branch pipe forming cavity and used for driving bulging deformation of a pipe blank. The forming inner die block is connected with the two pushing rods through double-hinge connection rods. The axes of the pushing rods are parallel to the axis of the forming cavity. The pushing rods are mounted in the corresponding bulging squeezing punches in a sliding fit mode respectively. One pushing rod is provided with a quick detaching connection structure. An auxiliary pressure mechanism is arranged between the two pushing rods.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipes, and in particular relates to a rigid-plastic compound bulging molding die for a large-caliber tee pipe. 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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