Large-diameter t-branch pipe rigidity and plasticity compound bulging forming equipment

Abstract

Large-diameter t-branch pipe rigidity and plasticity compound bulging forming equipment comprises an upper half die and a lower half die, and a forming cavity is arranged between the upper half die and the lower half die. The two ends of the forming cavity are each provided with a bulging extrusion punch. The lower half die is provided with a branch pipe 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 extrusion punches, and comprises push rods located at the two ends of the rigid bulging inner mold respectively. A forming inner die block which is matched with the branch pipe forming cavity and used for driving pipe blanks to achieve bulging forming is arranged between the two push rods. The forming inner die block and the two push rods are connected through a double-hinged connecting rod. The axis of each push rod and the forming cavity are in slide fit, and the push rods are mounted in the corresponding bulging extrusion punches respectively. One push rod is provided with a quick-disassembling connecting structure. Compound hydraulic cylinders which are used for driving the bulging extrusion punches to slide in the forming cavity and used for driving the push rods to slide in the bulging extrusion punches are arranged at the two ends of the forming cavity. 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 pipe materials, and in particular relates to a rigid-plastic composite bulge forming equipment 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 th...

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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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