Rigid-plastic compound multi-cylinder latch-type bulging device for three-way pipe

Abstract

The invention discloses a rigid-plastic compound multi-cylinder latch-type bulging device for a three-way pipe. The device comprises an upper semi mold and a lower semi mold, wherein a forming cavity is formed between the upper semi mold and the lower semi mold; bulging extrusion punches are installed at two ends of the forming cavity respectively; a branch pipe forming cavity is formed in the lower semi cavity; a balancing punch is installed inside the branch pipe forming cavity; a rigid bulging inner mold is arranged between two bulging extrusion punches and comprises pushing rods located at two ends respectively; a forming inner mold block is arranged between two pushing rods; the forming inner mold block is connected with two pushing rods through double-hinge connecting rods; two connecting grooves facing towards the opening of the branch pipe forming cavity are formed in opposite ends of two pushing rods respectively; limiting structures are arrange in the connecting grooves; each pushing rod is installed inside corresponding bulging extrusion punch in a sliding fit mode, and a latch-type quick disassembly connection structure is arranged on one of the pushing rods; thrust devices are arranged at two ends of the forming cavity respectively; each thrust device comprises extrusion hydraulic cylinders and a central hydraulic cylinder; and at least three extrusion hydraulic cylinders distributed annularly and uniformly are arranged.

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 rigid-plastic composite multi-cylinder lock-type 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 diffe...

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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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