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Method and apparatus for reducing and sizing hot rolled ferrous products

A technology for workpieces and finished products, applied in the field of continuous hot rolling, can solve problems such as inefficiency

Inactive Publication Date: 2006-08-09
PRIMETALS TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, three- and four-roll passes are far less effective at adequately penetrating the deformation into the core of the product than two-roll passes

Method used

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  • Method and apparatus for reducing and sizing hot rolled ferrous products
  • Method and apparatus for reducing and sizing hot rolled ferrous products
  • Method and apparatus for reducing and sizing hot rolled ferrous products

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Experimental program
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Embodiment Construction

[0023] Referring to Fig. 1 first, according to the present invention, a rolling process sequence includes P 1 -P 4 Four passes are configured to roll a circular process section 10a to a finished section 10e. Pass P1 is defined by two work rolls 12 having grooves configured to roll a circular process section 10a into an oval section 10b.

[0024] Roll time P 2 Delimited by two work rolls 16 having grooves configured to roll the oval profile 10b into a circular process profile 10c. According to the rolling process adopted, the rolling times P 1 , P 2 It is stipulated that the cross section can be reduced by about 20-55%, among which, in the rolling time P 1 The fracture surface is reduced by about 11-28%, and the rolling times P 2 The fracture surface is reduced by about 10-23%.

[0025] Roll time P 3 Delimited by three work rolls 20 having grooves 22 configured to roll a circular course section 10c into another circular course section 1Od. Roll time P 4 Also defined b...

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PUM

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Abstract

A method of continuously rolling a ferrous workpiece into a finished round, comprising rolling the workpiece in successive first and second roll passes at an elevated temperature of between about 650 to 1000 DEG C, the first and second roll passes each being defined by two work rolls and being dimensioned to effect a combined reduction in the cross sectional area of the workpiece of at least about 20-55%, with an accompanying effective strain pattern dominated by a concentration of maximum effective strain at a central region of the cross sectional area; and while the effective strain pattern remains dominated by a concentration of maximum effective strain at a central region of the cross section, continuing to roll the workpiece in at least third and fourth consecutive roll passes, each of the third and fourth roll passes being defined by at least three rolls and being sized to effect a combined reduction in the cross sectional area of the workpiece of not more than about 4-25%.

Description

[0001] References to related applications [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 231,108, filed September 8, 2000, and US Patent Application (serial number unknown) filed August 10, 2001. technical field [0003] The present invention relates to the continuous hot rolling of long steel products including, in particular, steel section products of circular, octagonal, square and similar cross-sectional shapes. Background technique [0004] In the round steel rolling described herein, the term "setting" refers to the final deformation of the workpiece in the final rolling stage to obtain the nominal diameter of the finished product within the diameter tolerance range specified by the standard, typically, the diameter tolerance The difference is about ±0.1mm, and the tolerance of ellipticity is about 0.1mm, or less. Furthermore, in this context, the term "free tuning" means that the adjustment of the distance between the rol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/18B21B1/16B21B1/08B21B3/00
CPCB21B1/18
Inventor T·M·肖尔P·L·凯泽B·V·基弗
Owner PRIMETALS TECH USA