Clamp for hydraulic pipe expansion and fin distributing method of clamp

Abstract

The invention provides a clamp for hydraulic pipe expansion and a fin distributing method of the clamp. The clamp comprises a lower mold and an upper mold. The lower mold is provided with at least one groove, the bottom of the groove is arc, and the groove is in a U shape. The lower mold is provided with a plurality of fin distributing grooves used for the fins to be placed, and the fin distributing grooves penetrate through the side wall of the groove. At least one protrusion is arranged on the upper mold, the top of the protrusion is arc and matched with the groove in shape. The clamp is simple in structure and convenient to use, the clamp is used for hydraulic pipe expansion, due to the fact that pipe expansion is limited within a set range, partial unevenness, thinning, deformation, crack and damage can not happen, and the yield reaches 98%.

Description

technical field [0001] The invention relates to the technical field of hydraulic pipe expansion, in particular to a clamp for hydraulic pipe expansion and a method for arranging sheets thereof. Background technique [0002] At present, the aluminum tubes of frost-free aluminum tubes and aluminum fin evaporators for refrigerators are mainly flat tubes (smooth tubes inside), and the processing of internal tooth aluminum tubes (trapezoidal teeth and high and low teeth) required by foreign companies is still a domestic one. blank. As we all know, the refrigerant directly exchanges heat with the inner surface of the aluminum tube, and the size of the inner surface of the aluminum tube directly determines the heat exchange performance. In order to improve the heat exchange performance and reduce power consumption, the refrigeration industry has made great efforts to study how to increase the inner surface. Therefore, the high-performance internal tooth aluminum tubes mentioned ab...

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Problems solved by technology

[0003] In the process of hydraulic tube expansion, because the inside of the aluminum tube is in direct contact with the inner wall of the aluminum tube, the force is uniform, and the expansion of the tube under the action of the liquid will not cause various defects caused by the above-mentioned mechanical tube expansion. The tooth shape inside the aluminum tube is not Damage and deformation occur, but the yield is low

There will always be local unevenness and errors in the wall thickness, so in the process of hydraulic tube expansion, the aluminum tube will burst (up to 40%) when the constant pressure is not fully reached. If the set constant pressure is not reached, there will be Defects such as local incomplete riveting of aluminum tubes and fins

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