Rigid and plastic composite multiple-cylinder buckle type bulging forming equipment for large-caliber three-way pipe

Abstract

Rigid and plastic composite multiple-cylinder buckle type bulging forming equipment for a large-caliber three-way pipe comprises an upper half die and a lower half die. A forming cavity is formed between the upper half die and the lower half die. Bulging squeezing punches are mounted at the two ends of the forming cavity respectively. A branch pipe forming cavity is formed in the lower half die. 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 push rods located at the two ends respectively. A forming inner die block is arranged between the two push rods and connected to the two push rods through double-hinge connecting rods. The push rods are mounted in the corresponding bulging squeezing punches in a sliding fit mode. One push rod is provided with a buckle type quick dismounting connecting structure. Thrust devices are arranged at the two ends of the forming cavity respectively. Each thrust device comprises at least three squeezing hydraulic cylinders and a central hydraulic cylinder, wherein the squeezing hydraulic cylinders are uniformly and annularly distributed around the axis of the central hydraulic cylinder. 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 rigid-plastic composite multi-cylinder locking type bulging forming equipment for large-diameter tee pipes. 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. There...

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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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