Conical pipe continuous cold-pressing forming roller die

Abstract

The invention discloses a conical pipe continuous cold-pressing forming roller die. The roller die comprises a pair of roller die bodies which are the same in structure, wherein the excircles of the roller die bodies are arranged in a tangent mode, an effective cold pressing region of a whole circular die opening is formed at the tangent point after the two roller die bodies are matched, and the diameter of the formed whole circular die opening is gradually increased or decreased along with the reverse synchronous rotation of the pair of roller die bodies. The roller die has the advantages ofbeing capable of being used for forming conical pipes with various sizes theoretically, wide in application range, long in service life of the roller die, and low in cost of the subsequent service andmaintenance, moreover, the produced conical pipe is seamless, continuous and uniform in wall thickness.

Description

technical field [0001] The invention relates to a forming die for a seamless tapered pipe, in particular to a continuous cold-press forming roll die for a tapered pipe. Background technique [0002] The tapered pipe is a tapered pipe made of a circular pipe as a prototype and processed by special equipment and technology. The main raw material is carbon steel, and various materials such as stainless steel and alloy steel can also be used to obtain various tapered pipes with different properties. At present, tapered pipes are used in ship piping systems, medical equipment and even aerospace fields. The forming of conical tubes usually adopts hot push forming and cold press forming. Since the hot push forming process will cause irreversible changes in the internal molecular structure of the processed materials, the processed conical tubes will lose the properties of the material itself. Therefore, for materials Conical tubes with high performance requirements are generally fo...

AI Technical Summary

Problems solved by technology

This method of cooperating the extrusion molding of the die and the punch has high requirements on the die, and the quality of the final tapered pipe produced is low. For the die, it is easy to be deformed by extrusion during the production process. Although the tapered tube produced when the variable is small has no visible defects, it will still affect the accuracy of use. With the increase of deformation, the die may even break; for the punch, because it is long For the strip structure, the extrusion force of the material and the die during use will make it gradually lose its original straightness. As the deformation increases, the forming accuracy of the tapered tube will gradually decrease.

[0004] For example, the biggest defect of the extrusion molding method in the above patent is that it is difficult to ensure uniform and stable wall thickness of the tapered pipe, and when producing large or small tapered pipes, the manufacturing of the mold is difficult and the service life Short, once there is a problem with the mold, it needs to be replaced as a whole, and the cost of subsequent maintenance and replacement is relatively high. At the same time, extrusion also requires a huge driving force, which consumes a lot of manpower and material costs.

[0005] Therefore, the existing tapered pipe forming molds and forming methods can only process tapered pipes with a specific size range, the scope of application is narrow, the mold is easily damaged, the follow-up maintenance and replacement costs are high, and the tapered pipe wall thickness produced The problem of inhomogeneity requires a new molding die for the production of tapered pipes

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