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Mill pre-slitting and slitting passes

A technology of splitting pass and rolling mill, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of cracks and waste judgment in finished products, and achieve the goal of reducing cracks, improving economic benefits, and improving yield. Effect

Active Publication Date: 2019-05-31
YUNNAN DESHENG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing rolling process, a large number of finished products were judged to be scrapped due to cracks during slitting.

Method used

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  • Mill pre-slitting and slitting passes
  • Mill pre-slitting and slitting passes
  • Mill pre-slitting and slitting passes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, the diameter of the pre-cut hole is 21.74 mm, the distance H between the upper and lower edges of the connecting hole is 13.34 mm, the radius R of the arc is 3.63 mm, H: R=3.67. The diameter of the cutting hole is 23 mm, the center distance of the forming hole is 26.7 mm, the radius of the arc is 0.83 mm, and D:R=32.17.

Embodiment 2

[0019] Example 2, the diameter of the pre-cut hole is 20.84 mm, the distance between the upper and lower edges of the connecting hole is 12.48 mm, the radius of the arc is 3.57 mm, and H:R=3.57. The diameter of the cutting hole is 21.23 mm, the center distance of the forming hole is 24.5 mm, the radius of the arc is 0.9 mm, and D:R=27.22.

Embodiment 3

[0020] Example 3, the diameter of the pre-slit hole is 17.6 mm, the distance between the upper and lower edges of the connecting hole is 10.68 mm, the radius of the arc is 3 mm, and H:R=3.56. The diameter of the cutting hole is 18.5 mm, the center distance of the forming hole is 21.5 mm, the radius of the arc is 0.89 mm, H:R=24.16.

[0021] The modified pre-cut hole increases the distance between the split edges and reduces the arc radius of the connecting hole. After the rolled piece passes through the pre-slit hole, the formed pre-slit zone will not be taken away by the cooling water of the hole groove to increase the temperature at the pre-slit zone of the rolled piece. The high temperature tearing of the pre-slit strip is beneficial to the slit strip to be easily pressed when it enters the next rolling after being torn; the pre-slit rolled piece has better stability when it enters the slit hole, which is conducive to the adjustment and control of the two lines of the rolle...

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Abstract

The invention discloses a pre-cutting and cutting hole type of a mill. Pre-cutting holes comprise forming holes arranged side by side and connection holes used for connecting the forming holes; cutting holes comprise forming holes arranged side by side and connection holes used for connecting the forming holes. In the pre-cutting holes, the forming holes are round holes; one connection holes is arranged between two forming holes; the left side and the right side of each connection hole are fused with the forming holes on two sides; the upper edges and the lower edges of the connection holes are shaped as arcs with oppositely-arranged arc tops and are in smooth transition with the edges of the forming holes; and the ratio of spacing between the upper edges and the lower edges of the connection holes to the semi-diameter of the arcs is 3.56-3.67. In the cutting holes, the forming holes are round holes; one connection hole is arranged between two forming holes; the left side and the right side of each connection hole are fused with the forming holes on two sides; the upper edges and the lower edges of the connection holes are shaped as arcs with oppositely-arranged arc tops and are in smooth transition with the edges of the forming holes; and the ratio of centre-to-centre distance between the two forming holes to the arcs is 24.16-32.179.

Description

technical field [0001] The invention relates to a rolling mill pass. Background technique [0002] In the rolling of bar-shaped steel, a steel billet is rolled through the rough rolling unit and the intermediate rolling unit, and the rolled piece is cut into two or more parallel rolled pieces in the finishing rolling unit, which is called split rolling. [0003] The specific process is to heat the steel billet first, and then gradually roll it through different rolling mills from pre-cutting to splitting. In the existing rolling process, a large number of finished products are judged to be scrapped due to cracks generated during slitting. The reason is found to have a lot to do with the design of the pre-cut hole and the cut hole. Contents of the invention [0004] In view of this, the present invention provides a rolling mill pre-splitting and slitting pass, by adjusting the shape of the pre-slitting strip and the slitting strip between bar-shaped steel materials, crack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/02
CPCB21B27/024B21B27/028
Inventor 沈绍波陈云吴摇吴文林李德辉李春林
Owner YUNNAN DESHENG STEEL CO LTD