Roll profile with less unevenness of steel pipe internal threads rolled by Assel unit

Abstract

The invention provides a roll profile with less unevenness of steel pipe internal threads rolled by an Assel unit. From an inlet side to an outlet side of a roll, an inlet cone area, a shoulder area and a rolling area are arranged in sequence. The inlet cone area is composed of a first inlet cone area body and a second inlet area body. The first inlet cone area body is located between the second inlet cone area and an inlet end of the roll. The ratio of the length of the first inlet cone area in the axial direction of the roll to that of the second inlet cone area in the axial direction of theroll is 7 to 10. An inlet taper angle alpha 1 of the first inlet cone area is one degree from an inlet taper angle alpha 2 of the second inlet cone area. The ratio of the length of the rolling area in the axial direction of the roll to that of the second inlet cone area in the axial direction of the roll is 4 to 5. According to the roll profile with less unevenness of the steel pipe internal threads rolled by the Assel unit, the technical problem that because spiral unevenness appears on the internal surface of a steel pipe, user experience is severely influenced.

Description

technical field [0001] The invention belongs to the field of pipe rolling mill equipment, and in particular relates to a roll profile for reducing the inner thread of steel pipe rolled by an Assel unit. Background technique [0002] The internal thread of the steel pipe is an inherent defect in the rolling of the Assel mill. The designed roll shape is different, and the depth of the thread is also different. For example, the roll shape of the original Assel rolling mill ( Figure 5 ) The inner surface thread of the steel pipe rolled out is relatively serious, and the thread depth reaches 0.5mm-0.8mm, sometimes 1.0-1.2mm. First, the spiral concave-convex phenomenon on the inner surface affects the appearance of the steel pipe. It is difficult to pull out, and there is a knife during machining, etc.). Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention provides a roll profile for reducing the internal thread of the steel pipe...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a roll profile for reducing the inner thread of the steel pipe rolled by the Assel unit, which solves the technical problems that the spiral concave-convex phenomenon on the inner surface of the steel pipe affects the appearance of the steel pipe and seriously affects the use of the user

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