The method of opening spiral grooves on the outer wall of pipe fittings

Abstract

The invention discloses a method for forming a spiral groove on the outer wall surface of a pipe fitting. The method comprises the following steps that step 1, one end of the pipe fitting is connectedwith a device provided with a spiral groove; step 2, a first rotary extrusion wheel and a second rotary extrusion wheel are arranged on a device provided with the spiral groove, a first annular groove is formed in the first rotary extrusion wheel, a second annular groove is formed in the second rotary extrusion wheel, the second rotary extrusion wheel is driven by the device provided with the spiral groove to drive the second rotary extrusion wheel to move, so that the pipe fitting is clamped by the first rotary extrusion wheel and the second rotary extrusion wheel to generate extrusion action force of the pipe fitting, the position, clamped by the pipe fitting, of the pipe fitting is respectively abutted against the first annular groove and the second annular groove, the pipe fitting isunder the extrusion force generated by the first rotary extrusion wheel and the second rotary extrusion wheel, the outer wall of the pipe fitting is recessed towards the interior of the pipe fitting;and step 3, the device provided with the spiral groove drives the pipe part to move along the axial direction of the pipe part and rotate the pipe part at the same time, under the extrusion action force of the first rotary extrusion wheel and the second rotary extrusion wheel, the surface of the pipe fitting is extruded out of the spiral groove. According to the method for forming the spiral groove on the outer wall surface of the pipe fitting, deformation of the pipe fitting in the process of forming the spiral groove can be avoided.

Description

technical field [0001] The invention relates to the technical field of pipe fitting processing, in particular to a method for opening a spiral groove on the outer wall of a pipe fitting. Background technique [0002] Air-conditioning systems for motor vehicles are provided with various heat exchangers, such as double-pipe heat exchangers. A conventional double tube heat exchanger consists of tube fittings and outer tubes. The outer tube is sleeved on the pipe fitting, and an input port is connected to the peripheral surface of one end of the outer tube, and an output port is connected to the peripheral surface of the other end of the outer tube. After passing through, flow out from the output port. After the exchange fluid enters the interior of the outer tube, it exchanges heat with the liquid flowing through the tube through heat transfer. [0003] In order to improve the heat exchange efficiency, in the prior art, grooves are formed on the outer wall of the pipe fittin...

AI Technical Summary

Problems solved by technology

[0006] Since one end of the cylinder is connected to the rolling head, and the rolling head adopts the roller 18, the roller 18 only rolls on the surface of the tube blank 3, but, because the extrusion force produced by the roller 18 on the tube blank The transmission on both sides of the groove is formed. Obviously, since the extrusion force cannot be controlled, the groove wall surface on both sides of the groove and the pipe wall surface of the tube blank 3 will be deformed after the groove is formed on the tube blank 3.

[0007] In addition, the position of the roller 18 relative to the tube blank 3 is fixed, so the cylinder 16 can only move along the axial direction of the sleeve 12, but cannot rotate. Obviously, this structure is achieved by the axial movement of the cylinder 16. to adjust the distance between the roller 18 and the tube blank 3, and the fixing of the cylinder 16 is through the abutment of the fixing screw 17 and the cylinder 16, so that the cylinder 16 is positioned in the radial direction, but, in the extrusion process, The tube blank 3 will generate a radial (expanding) force on the roller 18 during the moving process. The radial force is parallel to the axial direction of the cylinder 16. Therefore, the radial force formed when the tube blank 3 moves After acting on the cylinder 16, since the cylinder 16 has not been positioned in the axial direction, it will cause the cylinder 16 to move in the axial direction, resulting in inconsistent depths of the processed grooves in various parts

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