Lubricating liquid for use in aluminum pipe expansion and aluminum pipe expansion method

Abstract

The invention provides a lubricating liquid for use in aluminum pipe expansion and an aluminum pipe expansion method using same. The lubricating liquid is prepared from the following materials in percentage by weight: 0.9 to 1 percent of trichloroethylene, 1.8 to 2 percent of chromic anhydride, 6 to 7 percent of liquid cleanser essence solution in which the water to liquid cleanser essence is 1:5,000, and 90 to 91.3 percent of washing-up liquid. The aluminum pipe expansion method comprises the following steps: 1) spreading the lubricating liquid on the inner wall of the aluminum pipe before the expansion of the aluminum pipe; and 2) washing the lubricating liquid with high-pressure constant-temperature water after the expansion of the aluminum pipe. The lubricating liquid has the following advantages of: 1) avoiding damaging the aluminum pipe due to no corrosive and oxidizing properties; 2) washing easily enough to keep the smooth of the pipe, increasing the flexibility of the aluminum pipe to prevent the aluminum pipe from cracking and improving rate of finished products; 3) forming a protective film which can protect an evaporator and prolong the service life of the product; and 4) realizing the replacement of copper by aluminum, reducing product cost and making the aluminum achieve the same heat conducting effect as copper.

Description

technical field [0001] The invention relates to the technical fields of chemical and mechanical processing, in particular to a lubricating liquid for aluminum tube expansion processing and an aluminum tube expansion processing method. technical background [0002] Existing tube expansion technologies generally use copper tubes as processing objects. The copper tube expansion process is a process in which a mold core with a diameter larger than the inner diameter of the copper tube is inserted into the copper tube, so that the outer diameter of the copper tube is also enlarged accordingly. The copper tube expansion process is mostly used in the production of air-conditioning evaporators: first string multiple pieces of aluminum foil on the copper tube, and then expand the copper tube, then the outer wall of the copper tube will form an interference fit with the via hole on the aluminum foil after expansion In this way, the aluminum foil is fixed on the copper tube, forming t...

AI Technical Summary

Problems solved by technology

However, although aluminum also has good ductility, in fact, using the same tube expansion process as copper tubes for aluminum tubes does not achieve good results.

This is because, if engine oil is used to lubricate the inner wall of the aluminum tube during tube expansion, on the one hand, the oil is difficult to clean; short service life

However, there is no lubricating fluid specially used for the aluminum tube expansion process on the market today.

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