Device for forming spiral slot in outer wall surface of pipe fitting

Abstract

The invention discloses a device for forming a spiral slot in the outer wall of a pipe fitting. A first drive mechanism drives a movable base to linearly move along a first linear guide rail; a seconddrive mechanism is fixedly arranged at the other end of the movable base; one end of the fixed base is fixedly arranged on a workbench; the other end of the fixed base is equipped with a first rotaryextrusion wheel; a first ring-shaped slot is formed in the peripheral surface of the first rotary extrusion wheel; one end of the movable base is in sliding fit to a second linear guide rail; the other end of the movable base is equipped with a second rotary extrusion wheel; a second ring-shaped slot is formed in the peripheral surface of the second rotary extrusion wheel; a power output end of alinear drive mechanism fixedly arranged on the workbench is fixedly connected with the movable base; a through hole is formed in a first supporting base fixedly arranged on the workbench; and the axial direction of the through hole and the axial direction of the output end of the second drive mechanism are positioned on the same straight line. The device can prevent the pipe fitting from being deformed in a process of forming the spiral slot.

Description

technical field [0001] The invention relates to the technical field of pipe fitting processing, in particular to a device for opening spiral grooves 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 an inner tube and an outer tube. The outer tube is sleeved on the inner tube, 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 the gap flows through, it flows 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 inner tube by means of heat transfer. [0003] In order to improve the heat exchange efficiency, in the prior art, grooves are formed on the outer wall...

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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