Manufacturing technology of car-carried refrigerator heat exchange tube

Abstract

The invention discloses a manufacturing technology of a car-carried refrigerator heat exchange tube. The technology comprises the following steps: firstly, selecting a metal tube according to the size and the shape of the heat exchange tube and removing burs till the surface of the metal tube is smooth; secondly, placing the metal tube obtained in the first step on a lower die of a forming die, lowering an upper die, so as to be assembled with the lower die; thirdly, plugging two ends of the metal tube through ejector rods and sealing the two ends of the metal tube, and injecting liquid into the metal tube from a through hole in the ejector rod through a power device, so as to ensure that the metal tube is filled with liquid and sufficient pressure is kept for supporting bending forming; fourthly, starting a bending die to perform bending forming on the metal tube filled with liquid; fifthly, enabling the bending die to reset, lifting the upper die, and taking out a finished product; sixthly, stress annealing the forming heat-exchanger tube. The technology has the advantages that special bent pipe forming requirements can be met, the forming mode is simple, the technology is simple to operate, the cost is saved, replacement is convenient, and the degree of wear of dies can be reduced, so that the dies are protected, and further the normal operation of equipment is guaranteed.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted refrigerators, in particular to a manufacturing process of a heat exchange tube of a vehicle-mounted refrigerator. Background technique [0002] At present, domestic and foreign bend pipes are basically made of standard parts, and the outer diameter and curvature radius conform to ANSI / ASME, GB and other relevant standards, which have great limitations, and the molds used are also very single. Or when the radius of curvature deviates from the standard, it often cannot be satisfied. [0003] If the outer diameter or radius of curvature of non-standard pipe fittings is similar to that of standard pipe fittings, molds similar to the standard are generally used in production to form the shape first, and then other shaping methods are used to make the product meet customer requirements, but the quality of pipe fittings is often limited. The deviation is large, and external defects are easy to ...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic and foreign bend pipes are basically made of standard parts, and the outer diameter and curvature radius conform to ANSI / ASME, GB and other relevant standards, which have great limitations, and the molds used are also very single. Or when the radius of curvature deviates from the standard, it often cannot meet the

[0003] If the outer diameter or radius of curvature of non-standard pipe fittings is similar to that of standard pipe fittings, molds similar to the standard are generally used in production to form the shape first, and then other shaping methods are used to make the product meet customer requirements, but the quality of pipe fittings is often limited. The deviation is large, and it is easy to produce external defects after plastic surgery, which eventually leads to a high product scrap rate and greatly increases the manufacturing cost

[0004] If the non-standard part differs greatly from the standard, it cannot be produced, thereby delaying the delivery date and causing losses

Existing pipe bends are all aimed at standard pipe fittings. The form is relatively simple, as long as there are outer molds and cores, they can work. However, this kind of forming method is relatively limited and is not suitable for some special requirements.

[0005] In the prior art, in order to bend and shape metal pipes, the pipes are usually filled with solid materials such as sand, lead, and alum, and then bent and shaped, and then the metal pipes are heated to make the filling flow out of the pipes. Although this method can achieve the purpose of bending, there are many deficiencies in the heat exchange tubes produced, such as: uneven pipe fittings, inconsistent sizes, etc., while the above-mentioned production method has low work efficiency, complicated process, and large pollution