Tubular product drawing die and drawing process

Abstract

The invention discloses a tubular product drawing die and a drawing process. The drawing process adopts the tubular product drawing die. The tubular product drawing die comprises a die main body and adie core. A drawing channel which penetrates the die main body is arranged on the die main body, the drawing channel is provided with a feed inlet and a discharge hole, and the drawing channel is successively provided with a correction tape, a thickening tape and a sizing tape capable of reducing the outer diameter of a tubular product progressively from the feed inlet to the discharge hole; andthe die core is inserted into the drawing channel, a gap where the side wall of the tubular product penetrates is formed between the outer side wall of the die core and the side wall of the drawing channel, and the radial dimension of the part, corresponding to the sizing tape, of the die core is greater than the radial dimensions of the parts, corresponding to the correction tape and the thickening tape, of the die core. The tubular product is in an empty-drawing state when passing through the correction tape and the thickening tape, so that the outer diameter of the tubular product is reduced and the wall thickness of the tubular product is increased. As the tubular product is relatively small in wall thickness when entering the correction tape, the tubular product can be corrected to rectify the coaxiality of the tubular product, and relatively large fluctuation of dimension of the tubular product in the process that the tubular product passes through the sizing tape can be avoided,so that the CPK value is increased.

Description

technical field [0001] The invention relates to the field of pipe drawing, in particular to a pipe drawing die and a drawing process. Background technique [0002] Aluminum-based tubes for photosensitive drums require high dimensional accuracy, the tolerance zone of the inner and outer diameters does not exceed 0.05mm, and the coaxiality requirement does not exceed 0.05mm. Generally, the extruded tubes need to be drawn, and the amount of drawing deformation must be guaranteed Above 45%, so as to obtain products that meet the requirements. The conventional drawing process generally adopts two passes of internal and external drawing, the first drawing is rough drawing, and the second drawing is fine drawing. The drawing principle of the two passes is the same, both through internal and external drawing. Deformation process to improve product precision. [0003] However, the conventional drawing process has the following problems: 1. The correction effect of internal and exte...

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Problems solved by technology

[0003] However, the conventional drawing process has the following problems: 1. The correction effect of internal and external drawing on the coaxiality of the pipe is limited, so the coaxiality of the pipe is basically guaranteed by the extrusion molding process, which increases the cost of the pipe extrusion molding process. Difficulty; 2. In the process of internal and external drawing, the reduction in the radial dimension of the pipe is small, and the reduction in the wall thickness of the pipe is relatively large, resulting in large fluctuations in the size of the pipe after drawing, and the CPK value (process capability index) Smaller, unable to meet higher quality requirements

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