Three-Roller Reducing Mill Pass Measurement for Elliptical Major Axis
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Solution Overview
Problem
The existing three-roller reducing mill lacks a method to accurately measure the major semi-axis after processing, leading to errors in pass size, resulting in defects like black threads and internal ellipse issues, which affect the outer diameter and surface quality of steel pipes.
Innovation Solution
A method involving the selection of average diameter, first and minor semi-axis values from a data table, calculation of line segments using elliptic equations and right-angle triangle theorems, and measurement with internal micrometers or calipers to determine the correctness of the major semi-axis measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pass template is made to measure the pass size, then both major and minor semi-axes can be measured, but the cost is high
Solution Approach 1:
Instead of creating a full physical pass template, the invention uses a simplified copying approach where only the essential reference features are replicated. The template is designed to contain only the critical geometric references needed for measurement, reducing material and manufacturing costs while maintaining measurement accuracy.
Solution Approach 2:
The invention changes the measurement parameters from direct physical measurement requiring expensive templates to calculation-based measurement using readily available data. By utilizing the elliptic equation and right-angle triangle theorem with measurable parameters, the need for expensive physical templates is eliminated.
2Ease of operation
If the major semi-axis is not measured, then the measurement process is simple, but the accuracy of outer diameter and surface quality cannot be guaranteed
Solution Approach 1:
The invention performs preliminary measurement and verification of the major semi-axis before the rolling process. By measuring and verifying the pass dimensions in advance using the proposed methods, potential errors are detected and corrected before production, preventing defects in the final product while maintaining operational simplicity.
Solution Approach 2:
The invention introduces a feedback mechanism where the measured major semi-axis value is compared against the designed value. If the measured value deviates from the design specification, the pass is identified for reprocessing. This feedback loop ensures manufacturing precision without significantly complicating the measurement process.
Data Source
AI summary
A method for rapidly measuring the roller pass major semi-axis of a three-roller reducing mill to improve the outer-diameter precision and surface quality of a steel pipe includes selecting a corresponding value of the average diameter of an elliptical pass, a value of a first major semi-axis, and a value of a minor semi-axis according to a rack station number of a special numerical control lathe; calculating a value of a first line segment according to an elliptic equation, the obtained value of the first major semi-axis, and the obtained value of the minor semi-axis; calculating a value of a second major semi-axis according to the right-angle triangle theorem and the value of the first line segment; and measuring a value of the first dimension by attaching three claws of a three-claw internal micrometer to three roller gaps.