The Manufacturing Process of Copper Pipe with Equal Wall Thickness and Reduced Diameter

Abstract

The invention discloses a manufacturing process for an equal wall thickness variable-diameter copper pipe. The manufacturing process includes the steps that a section of copper pipe required by the design length is selected; the copper pipe is fixed, the diameters of the two ends of the copper pipe are expanded, two diameter-expanding sections are machined, protecting bodies are clamped at the ends of the copper pipe in the diameter expanding process, core rods are pushed into the copper pipe from outside to inside in the axial direction from the two ends of the copper pipe, the ends of the copper pipe are heated in the pushing-in process of the core rods, and the ends of the copper pipe are pushed in the axial direction from outside to inside; knurling treatment is conducted on the diameter-expanding sections, so that corrugated spiral grooves are formed in the surfaces of the diameter-expanding sections; the outer ends of the diameter-expanding sections are subjected to diameter changing and shrinking treatment to be in the designed pipe diameter size, straight-pipe-shaped pipe opening sections are formed, and threads are machined on the pipe opening sections. The equal wall thickness variable-diameter copper pipe manufactured through the method is integrally formed, the utilization rate of materials is high, the cost is low, the pipe is pushed while diameter expansion is conducted, the wall thicknesses of all the portions of the pipe are made moderate and consistent, bending and mounting are easy, the compression strengths of all the portions of the pipe are consistent, the overall pressure-resistant property of the pipe is balanced and high, and leakage is not likely to happen; the inner diameter of the pipe can be kept even, the flow velocity and the flow of refrigerating fluid in the pipe are made even, and therefore an air conditioning unit can work stably for a long time.

Description

technical field [0001] The invention relates to a processing technology of a copper pipe, in particular to a manufacturing technology of a copper pipe with equal wall thickness and variable diameter. Background technique [0002] At present, metal connecting pipes are used as air-conditioning pipes to transfer refrigerant between air-conditioning equipment units. The traditional air-conditioning pipes are equal-diameter pipes. Due to the need to pass through walls or bend corners during installation, such air-conditioning pipes are easily deformed due to bending. As a result, the circulation of the refrigerant in the tube is not smooth, and the service life of the air conditioning tube is shortened. In order to solve the above problems and adapt to the needs of different positions or component structures inside the unit, different-diameter air-conditioning pipes with varying diameters will be used. [0003] At present, the common different-diameter air-conditioning pipes ar...

AI Technical Summary

Problems solved by technology

The increase of wall thickness will greatly increase the production cost, and the utilization rate of materials is also low. Moreover, the increase of wall thickness makes it difficult to bend the air-conditioning pipe, and it is more difficult to install; the combination of multiple pipes increases the number of solder joints, reducing the The overall strength is compromised, and leaks are prone to occur at welded joints

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