Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials
A processing method and large-diameter technology, applied in the field of metal processing and forming, can solve the problems of limited wall thickness reduction, weld seam reduction in overall performance, large wall thickness deviation, etc., to avoid coarse structure and inclusions, and strictly control The effect of refining the structure and strictly controlling the uniformity
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[0039] Example 1
[0040] The specific steps for the preparation and processing of large-diameter and ultra-thin-walled pipes are as follows:
[0041] (1) The processing object is Inconel690 nickel alloy large-diameter ultra-thin-walled pipe with a diameter of Ф500mm and a wall thickness of 0.5mm. Clean, polish and repair the surface defects of the pipe to obtain the pipe;
[0042] (2) Expand one end of the pipe obtained in step (1) on a press or spinning machine, the diameter of the flared part is Ф508mm, and then evenly apply lubricant on the inner and outer walls of the pipe and the die hole of the sizing die;
[0043] (3) Insert the unflared end of the pipe obtained in step (2) into the die hole of the sizing die. The die hole size of the sizing die is the same as the diameter of the pipe, and the outer wall of the pipe is close to the die hole of the sizing die, and the center of the pipe is The line and center coincide with the center line and center of the sizing die. Then fi...
Example Embodiment
[0047] Example 2
[0048] The specific processing steps are the same as in Example 1. The processing object is a Monel400 nickel alloy large-diameter ultra-thin-walled tube. The thin-walled tube is prepared and processed as in Example 1. The Monel400 alloy tube has a diameter of 900mm and a wall thickness of 1mm. The finished pipe has a diameter of Ф900mm, a wall thickness of 0.8mm, and a diameter-to-thickness ratio of 1125. Expand one end of the pipe on the spinning machine, and the diameter of the flared part is Ф920mm. The taper angle of the expanded core head is 15°, the length of the sizing belt is 50mm, and the drawing speed is 5mm / s. After three passes of drawing, a pipe with a wall thickness of 0.85mm is obtained. The wall thickness of the pipe after the first drawing is 0.94mm, and the processing rate is 5.99%; the wall thickness of the pipe after the second drawing is 0.89mm, and the processing rate is 5.31%, and the wall thickness of the pipe after the third drawing ...
Example Embodiment
[0049] Example 3
[0050] The specific processing steps are the same as in Example 1. The processing object is a Monel400 nickel alloy large-diameter ultra-thin-walled tube. The thin-walled tube is prepared and processed as in Example 1. The Monel400 alloy tube has a diameter of Ф600mm and a wall thickness of 1.5mm. The diameter of the finished pipe is Ф600mm, the wall thickness is 0.6mm, and the diameter to thickness ratio is 1000. Expand one end of the pipe on the press, and the diameter of the flared part is Ф610mm. First, it is drawn by four passes and then subjected to vacuum annealing; then, after three passes, a pipe with a wall thickness of 0.35 mm is obtained. Before vacuum annealing, the taper angle of the expanded core is drawn in four passes at 30°, the length of the sizing tape is 30mm, and the drawing speed is 20mm / s; after vacuum annealing, the taper of the expanded core is drawn three passes The angle is 15°, the length of the sizing belt is 25mm, and the drawin...
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