Molding drawing die of U-shaped elliptical or approximately elliptical condensation pipe, and machining method of molding drawing die

Abstract

The invention relates to a molding drawing die of a U-shaped elliptical or approximately elliptical condensation pipe, and a machining method of the molding drawing die. The molding drawing die is characterized in that two drawing die holes are formed in the molding drawing die and are positioned in a same horizontal line; an interval between the two drawing die holes is equal to distance between two condensation pipes of the U-shaped elliptical condensation pipe; an inlet section of each drawing die hole is a conical section of which the cross section is elliptical; the tail end of the inlet section is smoothly connected with an outlet shaping section; the shaping section is an elliptical straight pipe section. The molding drawing die is characterized in that the conicity of the conical section of which the cross section is elliptical is 8.1 DEG; the length of a short shaft at an inlet of the elliptical conical section is greater than the diameter of a circular pipe; the conical length is 24mm; the length of an elliptical forming linear section is 6mm, and the cross section of the elliptical straight pipe section of the shaping section is zero tolerance relative to the elliptical condensation pipe. The molding drawing die has the advantages that the machined elliptical condensation pipe is accurate in appearance dimension, smooth in surface and invariable in wall thickness; process flows of subsequent welding and fin penetration of the elliptical condensation pipe are ensured.

Description

technical field [0001] The invention relates to a forming drawing die for a U-shaped ellipse or an approximately ellipse condenser tube and a processing method thereof. Background technique [0002] At present, in the air conditioning industry, the heat exchange efficiency of the heat exchanger directly determines the efficiency of the air conditioner. With the shortage of energy, the national standard for the efficiency of the air conditioner has also been greatly improved. Therefore, various manufacturers are constantly improving the efficiency of the heat exchanger. structure, so that it can meet the requirements of the new national standard. Now in order to improve the heat exchange efficiency of the heat exchanger, some manufacturers have developed the elliptical tube heat exchanger condenser tube, which greatly reduces the wind resistance of the heat exchanger and reduces the condensing tube The tail vortex, so its heat transfer efficiency is greatly improved, but how ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the air conditioning industry, the heat exchange efficiency of the heat exchanger directly determines the efficiency of the air conditioner. With the shortage of energy, the national standard for the efficiency of the air conditioner has also been greatly improved. Therefore, various manufacturers are constantly improving the efficiency of the heat exchanger. structure, so that it can meet the requirements of the new national standard. Now in order to improve the heat exchange efficiency of the heat exchanger, some manufacturers have developed the elliptical tube heat exchanger condenser tube, which greatly reduces the wind resistance of the heat exchanger and reduces the condensing tube The tail vortex, so its heat transfer efficiency is greatly improved, but how to process the circular condenser tube into an oval tube is another thorny problem. Since the air conditioner condenser tube is generally a U-shaped bend tube, it can only be used at present It is the pressing of the rolling rod to process the round tube into an oval tube, but because the copper / aluminum round tube is soft, it will have ripples on the surface after rolling, and the cross-sectional dimension tolerance of the rolled oval tube is very large, It is extremely difficult to thread the sheet, which brings great problems to the subsequent welding process, and the efficiency of processing is very low, and the scrap rate is high. Therefore, it is urgent to develop new processing methods and processing equipment to produce qualified U-shaped elliptical condensation Tube

Images