Tee-joint pipe rigid and plastic composite bulging device

Abstract

The invention discloses a tee-joint pipe rigid and plastic composite bulging device. The tee-joint pipe rigid and plastic composite bulging device 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 extrusion punches are arranged at the two ends of the forming cavity respectively. The lower half die is provided with an axis branch pipe forming cavity. A balance punch is arranged in the branch pipe forming cavity. A rigid bulging inner die is arranged between the two bulging extrusion punches. The rigid bulging inner die comprises push rods located at the two ends respectively. A forming inner die block which is matched with the branch pipe forming cavity and used for driving a pipe blank for bulging deformation is arranged between the two push rods. The forming inner die block is connected with the two push rods through double hinged connecting rods. Connecting grooves facing an opening of the branch pipe forming cavity are formed in the opposite ends of the two push rods, and limiting structures are arranged in the connecting grooves. The push rods are arranged in the corresponding bulging extrusion punches in a sliding fit manner respectively. One push rod is provided with a rapid dismounting connecting structure. Push force devices are arranged at the two ends of the forming cavity respectively and comprise composite hydraulic cylinders.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipe materials, and in particular relates to a three-way pipe rigid-plastic compound 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 different pressure tra...

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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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