Method for rolling large-size square steel by single machine frame without groove

A single-stand, large-scale technology, applied in the field of steel rolling, can solve the problems affecting the serialization of enterprise product specifications, low roll utilization rate, unfavorable market competition, etc., to achieve flexible product specification changes, high roll utilization rate, good physical and chemical properties performance effect

Active Publication Date: 2007-08-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Rolling square steel with rolls with passes requires complete pass configurations. If the pass configuration on the same roll is insufficient to roll square steel products that exceed the pass size, it will seriously affect the serialization of enterprise product specification

Method used

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  • Method for rolling large-size square steel by single machine frame without groove
  • Method for rolling large-size square steel by single machine frame without groove

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Experimental program
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Embodiment Construction

[0077] As shown in Figure 1, the present invention utilizes the flat roll position of the original pass type of a single-stand rolling mill to carry out grooveless rolling, and the rolled piece is rolled between the upper and lower flat rolls 1 and 2. Clamped by the side wall of the pass, the height of the roll gap is the height of the rolled piece, and because there is no effect of the side wall of the pass, the width of the rolled piece is the width of the rolled piece after free expansion. Among them, 5, 6, and 7 are the 2# holes, 3# holes, and 1# holes (flat holes) of the original rolling mill respectively; the left side of the rolling mill is the driving side, and the right side is the working side.

[0078] The 450mm square steel initial rolling grooveless rolling procedure of the present invention is as shown in Table 2, totally 23 passes. The rolling procedure is designed as follows: four passes of rolling without grooves first, then the billet is turned over 90°, and ...

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PUM

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Abstract

The invention discloses single frame non slot rolling large size square steel method. It adopts big delivery head two-high reversing blooming mill system. Each of blank side is repeatedly made into roller pressing underside and free spread side, processed reciprocating many passes non slot rolling by the horizontal mill to form finished product. It uses critical percent of reduction control method to control the size of the single and double drum ratio in the approved range, control width to height ratio to remove rolling off square. Thus the invention can reduce pass positioning, produce the large square steel product with high quality and flexible size by using non slot rolling technique.

Description

technical field [0001] The invention relates to iron and steel rolling technology, in particular to the rolling technology of square steel with a thickness of more than 400mm. Background technique [0002] At present, the conventional production methods of large square steel at home and abroad are: rolling, continuous casting of blooms or forging methods using rolls with grooves. [0003] Among them, the use of rolls with passes for rolling is a general technology. By turning different passes on the rolls and compiling rolling procedures, the billets are rolled back and forth in multiple passes in sequence. The general pass system is "Box - Square" series. When rolling with a pass, because the pass is overfilled, ears will appear on both sides of the rolled piece; if the upper and lower rolling grooves of the pass are not aligned, the cross-section of the rolled piece will be wrong. The rolled piece without groove can avoid various defects due to the pass shape. [0004] ...

Claims

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Application Information

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IPC IPC(8): B21B1/08
Inventor 徐震唐劲松陈林
Owner BAOSHAN IRON & STEEL CO LTD
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