Lock catch type rigid and plastic compound bulging die for hydraulically-controlled T-branch pipe

Abstract

The invention discloses a lock catch type rigid and plastic compound bulging die for a hydraulically-controlled T-branch pipe. The lock catch type rigid and plastic compound bulging die 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. 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 squeezing punches and comprises pushing rods located at two ends respectively. A forming inner die block is arranged between the two pushing rods. The forming inner die block is connected with the two pushing rods through double-hinge connection rods. The opposite ends of the pushing rods are provided with connection grooves facing the opening of the branch pipe forming cavity. Limiting structures used for preventing the axes of the two double-hinge connection rods from coinciding are arranged in the connection grooves. 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. Bulging liquid inlets and bulging liquid outlets are formed in the bulging squeezing punches. One pushing rod is provided with a lock catch type quick detaching connection structure.

Description

technical field [0001] The invention belongs to the technical field of non-cutting processing of pipes, and in particular relates to a liquid-controlled three-way pipe lock type rigid-plastic composite bulging mold. 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 diff...

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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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