Roller for preventing pipe body from cross piercing rear-jamming
A cross-rolling piercing and rolling technology, which is applied in the direction of rolling, metal rolling, metal rolling, etc., can solve the problems of back jamming and gap increase, reduce plug wear, improve rolling rhythm, and have good wall thickness uniformity Effect
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Embodiment 1
[0061] In this example, the diameter D of the blank before piercing p = 45mm, then the radius R of the required roll = 120mm, the roll feeding angle β = 15°, the rolling angle γ = 15°, Roll entrance section length L 1 =105mm, the length of roll exit section L 2 =137mm, roller distance D ck =41.4mm, combined with R in the present invention x1 , R y1 , R x2 , R y2 , R 1 , R 2 The calculation formula obtained: the center O of the first circular arc 1 The coordinates are (100.7, 274.7), radius = 407.3mm; the center O of the second arc 2 The coordinates of are (178.6, 658.7), radius=798.9mm; i=10mm, j=10mm.
[0062] The roll surface curve of the roll is determined according to the first arc, the intersection point of the first arc and the roll inlet end face, the second arc, and the intersection point of the second arc and the roll exit end face, and the obtained roll shape is as follows image 3 and Figure 4 shown.
Embodiment 2
[0064] In this embodiment, ordinary conical rollers are used to perforate the TC4 bar. First, a TC4 bar with a size of Φ45×200 mm is obtained as the original blank by machining. After heating to 960°C to remove the surface scale, the cross-rolling piercing test was carried out. The roll speed is 70r / min, the feeding angle and rolling angle are both 15°, the size of the plug during the piercing process is Φ20×40mm, the diameter reduction rate is 8%, and the front reduction rate is 6%. After the jam occurs during the piercing process, the blank cannot be completely separated from the plug, such as Figure 5 shown.
Embodiment 3
[0066] In this example, the roll obtained in Example 1 is used to perforate the TC4 bar, and a TC4 bar with a size of Φ45×200 mm is obtained as the original blank by machining. After heating to 960°C to remove the surface scale, the cross-rolling piercing test was carried out. The roll speed is 70r / min, the feeding angle and rolling angle are both 15°, the size of the plug during the piercing process is Φ20×40mm, the diameter reduction rate is 8%, and the front reduction rate is 6%. No post jamming occurred during the piercing process, and the pipe blank after piercing was air-cooled at room temperature to obtain a thick-walled pipe with a length of 223 mm, as shown in Figure 6 shown.
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