Adjustment method of plug replacement process for conical piercer

Abstract

The invention provides an adjustment method for a replacement process for plugs of a conical piercing machine. A plug replacement idea is proposed, and a process adjustment method for plug replacement is established according to wear degrees of conical piercing rolls and by virtue of the originally-designed plug specifications. The adjustment method has the following beneficial effects: outer diameters of hollow billets are effectively controlled to be within a range of Phi222-226mm, thus the rolling lives of the piercing rolls are prolonged, and the rolling number is increased to 23000 from the original 17000, thus the replacement frequency of the piercing rolls is effectively reduced, and time for a piercing roll replacement operation is saved by 3 hours per month; the anterograde requirements of field production are met, and the occurrence probability of hole, folding and crack defects on the outer surfaces of steel tubes due to too small or too large outer diameters of the hollow billets is reduced by more than 95%; and production efficiency is improved, the quantity of waste products is reduced, and the quality of the inner surfaces and the outer surfaces of the steel tubes is improved.

Description

technical field [0001] The invention relates to a method for adjusting the head replacement process of a conical piercer. According to the degree of wear of the tapered perforated roll, there is no need to add new plug specifications, and the original designed plug is directly used for plug replacement rolling, which not only ensures that the outer diameter of the capillary tube is within the range of Φ222-226mm, but also prolongs the service life of the perforated roll. Background technique [0002] In today's seamless steel pipe production, the tapered roll cross-rolling piercing process is widely used, which has many advantages such as large elongation coefficient, high production efficiency, and less tool consumption. Its structure is that the rolls are double-supported, the roll shape is conical, the roll axis and the rolling line are inclined to form an advancing angle of α, and the rolling angle formed by the rolling line plane is г, the structural diagram is as follo...

AI Technical Summary

Problems solved by technology

At this time, the thin-walled tubes can only be produced after 8,000 perforated rollers in terms of planning and scheduling, which makes planning and scheduling more difficult.

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