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Method for changing unevenness of linear wall thicknesses of heads of pierced billets

A technology with uneven wall thickness and straight lines, applied in metal rolling and other directions

Inactive Publication Date: 2016-12-07
王庸武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tension reducing machine has the disadvantage of thickening at both ends. After the waste pipe passes through the reducing machine, thickened ends will appear at the head and tail of the steel pipe. Reduction without tension

Method used

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  • Method for changing unevenness of linear wall thicknesses of heads of pierced billets
  • Method for changing unevenness of linear wall thicknesses of heads of pierced billets
  • Method for changing unevenness of linear wall thicknesses of heads of pierced billets

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Embodiment Construction

[0036] A kind of method of improving the uneven wall thickness of the head of the empty pipe of the present invention is to take the flat end process to flatten the oblique mouth of the head of the capillary 110 before the capillary 100 enters the continuous rolling mill (see Figure 5 ), so that the working conditions of each roll 210, 220 are consistent when the rolling mill bites the steel and rolls, so as to avoid the linear uneven wall thickness at the head of the waste pipe and reduce the loss of the cutting head. Figure 6 The 300 in it is the mandrel.

[0037] see Figure 7, the head 410 wall thickness uniformity of the blank pipe 400 after the capillary 100 after the flat end of the present invention is rolled has been greatly improved (with Figure 4 Comparison), reducing the cutting amount of the steel pipe head.

[0038] The present invention does not change other existing steel pipe rolling processes.

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Abstract

The invention discloses a method for changing unevenness of linear wall thicknesses of heads of pierced billets. The method is characterized in that bevels on heads of hollow billets are flattened through the end flattening process before the hollow billets enter a continuous mill, the working conditions of rollers are uniform in the steel biting and rolling process of the mill so that unevenness of the linear wall thicknesses of the heads of the pierced billets can be avoided, and the head end cropping loss can be reduced. According to the method, the head end cropping consumption and the tail end cropping consumption are basically equal, and therefore the metal consumption can be lowered by about 0.7%.

Description

technical field [0001] The invention relates to the technical field of steel pipe preparation, in particular to a method for improving the linear uneven wall thickness of the head of an empty pipe. Background technique [0002] At present, the head-cutting and tail-cutting losses of the more advanced continuous rolling mills are about 4%; among them, the cutting head accounts for about 60% (the cutting head loss is about 2.4%); the tail cutting accounts for about 40% (the cutting loss is about 2.4%). 1.6%). Cutting the head and tail is to cut off the head and tail parts whose geometric dimensions do not meet the dimensional accuracy requirements of the finished steel pipe. [0003] According to the on-site inspection, the length of the cutting head is long because the wall thickness of the straight line of the steel pipe head is not uniform, and the wall thickness exceeds the positive and negative tolerances, so it has to be cut off. Why does this happen? See the following...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/10
CPCB21B19/10
Inventor 王庸武
Owner 王庸武