Corrugated pipe forming method

Abstract

The invention relates to a corrugated pipe forming method and belongs to the technical field of tubular product processing. The corrugated pipe forming method comprises the following steps: driving anextrusion roller to press an inner concave surface on a tubular blank, wherein the rotary shaft of the extrusion roller is axially vertical to the axial direction of a to-be-formed tube part, and extrusion die cavities which are formed circumferentially are formed in the surface of the extrusion roller; and driving the extrusion roller to rotate at a first rotating speed around the to-be-formed tube part relative to the tube blank and driving the extrusion roller to feed at a first feeding sped along the axial direction of the to-be-formed tube part relative to the tube blank at the same timeso as to form a spiral groove in the tube blank, wherein the first feeding speed and the first rotating speed are in a preset proportion to the screw pitch of a current threaded groove section relatively. As the corrugated pipe forming method adopts the extrusion roller of the structure, corrugated pipes of different screw pitches can be formed by changing the ratio of the axial feeding speed andthe rotating speed. The corrugated pipe forming method can be widely applied to the manufacturing fields of refrigeration, automobiles, aviation and the like.

Description

technical field [0001] The invention relates to a pipe processing technology, in particular to a corrugated pipe forming method. Background technique [0002] Bellows, also known as threaded pipe, is often used in heat exchangers, common structures such as figure 1 and figure 2 As shown, the heat exchange area is increased by forming the spiral groove 02 on the pipe body 01 to improve the heat exchange efficiency. [0003] In the forming process of the existing corrugated pipe, such as image 3 The extruding roller of the above shape is formed, and the wheel surface of the extruding roller 03 is provided with an extruding punch 030 arranged along its circumference. The specific forming process is to adjust the extruding roller according to the helix angle of the spiral groove 02 03 Rotating shaft faces to the helix angle of the extrusion punch 030 toward the helical groove 02, and then drives the extrusion roller 03 to move a predetermined distance along the extrusion di...

AI Technical Summary

Problems solved by technology

[0007] When using the aforementioned forming machine to perform the aforementioned corrugated tube forming method to obtain a corrugated tube structure of a desired shape, in order to prevent the formed tube base from being deformed and making it difficult to obtain the desired shape, usually more than two forming steps are required. The spiral grooves formed many times can overlap. Usually, the extrusion roller is driven to move relative to the tube blank by pulling first, and then the extrusion roller is driven to move relative to the tube blank by pushing. This not only has low forming efficiency, but also easily causes 3 About % shortening of the tube length

In addition, in the development and design stage, it is difficult to determine the appropriate pitch, resulting in the need to back up multiple sets of extrusion rollers, not only high equipment costs, but also high time costs; and it is impossible to develop a bellows structure with variable pitch

[0008] Additionally, using the image 3 The extrusion roller 03 shown is difficult to form such as Figure 4 The shown slightly flat bellows structure 04, for example, a bellows structure with an elliptical cross-section of the tube base, can only be used to form a bellows structure with a roughly circular cross-section of the tube base

Images