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Machining process of aluminum alloy rectangular pipe

A processing technology and a rectangular tube technology, which is applied to the processing technology field of aluminum alloy rectangular tubes, can solve the problems of increased processing cost, low production efficiency, time-consuming and labor-intensive, etc., and achieves the effect of saving transition stretching and preventing the concave of the rectangular tube.

Inactive Publication Date: 2015-05-13
CHONGQING XIZHONG SPECIAL ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This two-pass stretching method is not only time-consuming and labor-intensive, but also has low production efficiency, and multiple sets of stretching tools have to be produced, which increases processing costs

Method used

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  • Machining process of aluminum alloy rectangular pipe
  • Machining process of aluminum alloy rectangular pipe

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Experimental program
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Effect test

Embodiment Construction

[0017] The production process route of an aluminum alloy rectangular tube is as follows: round tube wool → wool annealing → forming stretching → stretching straightening → cutting into finished products, sampling → packaging, and storage.

[0018] The design of the drawing die of the present invention mainly adopts the pre-deformation design, that is, when designing the external dimensions of the drawing die hole, instead of using a regular rectangle, it is designed as a protruding similar rectangle to offset the metal deformation during the drawing process. Degree of concavity due to uneven flow.

[0019] Such as figure 2 As shown, the protruding similar rectangular drawing die 1 has a major axis length of A and a minor axis length of B; the length of the stretched rectangular tube 2 is A1, the width is B1, and the empirical coefficient is K.

[0020] A1=A-KA, B1=B-KB

[0021] The empirical coefficient K is 1.0 to 2.0%.

[0022] In this embodiment, the drawing die of the ...

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Abstract

The invention discloses a machining process of an aluminum alloy rectangular pipe. A round pipe can be stretched in one pass to form the rectangular pipe. The machining process comprises the steps of annealing of round pipe blank, forming and stretching, stretching straightening, cutting of finished products, packaging and warehousing, and a stretch die in the machining process is designed in a pre-deformation way. The stretch die is designed in the pre-deformation way, a K value is controlled in a range of 1.0 to 2.0 percent, the inward recess of the rectangular pipe can be effectively prevented, the round pipe can be stretched into the rectangular pipe in one pass, one pass of transitional stretching and one middle annealing step are saved, and a stretch die and a stretch core head can be saved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a processing technology of an aluminum alloy rectangular tube. Background technique [0002] The aluminum alloy rectangular tube is mainly obtained by stretching the round tube wool. Since the stretching of the aluminum tube belongs to cold processing, there is no phenomenon of thermal expansion and contraction, so the die holes of the general drawing die are designed strictly according to the finished rectangular tube. That is, the outer dimension of the finished product is the outer dimension of the drawing die hole. However, in stretching production, due to the inhomogeneity of metal flow, the rectangular tube will often appear concave after stretching, and the middle of the long and wide sides will collapse inward (such as figure 1 ). This causes the plane clearance of the rectangular tube to be out of tolerance, and the external dimensions are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C1/02B21C3/02
CPCB21C1/02B21C3/02
Inventor 韩正东
Owner CHONGQING XIZHONG SPECIAL ALUMINUM