Metal Rolling Pass Sequence for Round Cross-Section
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Solution Overview
Problem
Existing rolling methods for metal products face challenges in achieving precise round cross-section shapes and sizes, often resulting in poor quality due to narrow rolling channels and high deformation, which increases production costs and reduces mechanical resistance.
Innovation Solution
A method involving four sequential rolling passes: the first pass creates a lozenge-shaped cross-section, the second a quadrangular shape, the third a partially round shape, and the fourth a fully calibrated round shape, using rolling units with specific angularly disposed rolls to induce homogeneous deformation and control material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the metal product is rolled to obtain a round cross section shape early in the second rolling pass, then the product geometry is improved, but the subsequent rolling steps require narrow and arched channels which increase pinching risk and deteriorate product quality
Solution Approach 1:
The rolling process is divided into four distinct passes with specific geometric transformations: first pass creates lozenge shape, second pass creates quadrangular shape, third pass creates partially round shape, and fourth pass achieves final calibrated round shape. This segmentation allows each pass to be optimized independently, avoiding the need to create a round shape too early while still achieving the final round geometry with high precision.
2Shape
If five rolling passes are performed to achieve round cross section shape, then the product geometry is improved, but the number of rolling passes increases production cost and the final dimensions remain imprecise
Solution Approach 1:
The patent optimizes the geometric parameters of each rolling pass to achieve the desired round cross-section shape in exactly four passes. By carefully controlling the lozenge shape in the first pass, quadrangular shape in the second pass, and partially round shape in the third pass, the final calibrated round shape is achieved in the fourth pass with precise dimensions and without requiring five or more passes, thus reducing production costs while maintaining geometric accuracy.
3Stability of the object's composition
If high deformation is induced in the metal product during rolling passes, then the granular structure homogeneity is improved, but the mechanical resistance of the final product is reduced
Solution Approach 1:
The total deformation required for structure homogenization is distributed across four sequential passes rather than applying high deformation in fewer passes. Each pass applies moderate deformation to progressively transform the cross-section geometry, allowing the granular structure to homogenize gradually without excessive stress that would reduce mechanical resistance. The specific sequence of lozenge → quadrangular → partially round → round shapes optimizes both structure homogeneity and strength retention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures strict tolerance compliance in size and geometry, enhances mechanical resistance, reduces production costs by minimizing rolling units, and extends the range of producible sizes without roll replacements.
Implementation Method 1
a first rolling pass of the metal product to obtain a first intermediate product with a lozenge-shaped cross section... a second rolling pass of the first intermediate product to obtain a second intermediate product with a quadrangular shape of the cross section... a third rolling pass of the second intermediate product to obtain a third intermediate product with a round shape of the cross section, not finished... a fourth rolling pass of the third intermediate product to obtain a final rolled product with a round, calibrated shape of the cross section
Data Source
AI summary
Method for rolling metal products comprising a plurality of sequential rolling passes during which a metal product (P) is rolled. The method comprises a first rolling pass of the metal product (P) to obtain a first intermediate product (P1), a second rolling pass of the first intermediate product (P1) to obtain a second intermediate product (P2), a third rolling pass of the second intermediate product (P2) to obtain a third intermediate product (P3), a fourth rolling pass of the third intermediate product (P3) to obtain a final rolled product (L).