Piercing Machine Outer Cooling for Uniform Hollow Shell Temperature
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Solution Overview
Problem
Existing techniques for producing seamless metal pipes using piercing machines often result in non-uniform temperature distributions along the axial direction of hollow shells, leading to variations in mechanical properties, as cooling fluids accumulate and cool unevenly during piercing-rolling and elongation rolling processes.
Innovation Solution
A piercing machine with an outer surface cooling mechanism that ejects cooling fluid towards the upper, lower, left, and right parts of the outer surface of the hollow shell within a specific cooling zone located rearward of the plug, ensuring uniform cooling by preventing fluid accumulation and ensuring the cooling fluid flows down naturally, thus reducing temperature differences between the fore and rear ends of the hollow shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is applied during piercing-rolling and elongation rolling, then the temperature of the hollow shell is reduced, but the cooling fluid accumulates and causes non-uniform temperature distribution along the axial direction
Solution Approach 1:
The patent applies cooling fluid not only from the inner surface but also from the outer surface of the hollow shell. By adding outer surface cooling nozzles that spray cooling fluid onto the outer surface, the system creates a multi-dimensional cooling approach. This ensures that cooling fluid reaches all areas uniformly without accumulating in specific regions, thereby achieving uniform temperature distribution along the axial direction while preventing fluid accumulation issues.
2Temperature
If cooling fluid is ejected from the plug or mandrel bar, then the inner surface of the hollow shell is cooled, but temperature differences arise between the fore end portion and rear end portion
Solution Approach 1:
The patent implements different cooling strategies for different locations of the hollow shell. Inner surface cooling nozzles are positioned at specific locations (fore end, rear end, and intermediate positions) to provide localized cooling where needed. Additionally, outer surface cooling nozzles are arranged to cool the outer surface at corresponding positions. This localized, multi-position cooling approach ensures that temperature distribution becomes uniform along the axial direction by addressing specific hot spots rather than applying uniform cooling throughout.
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
The solution effectively reduces temperature variations along the axial direction of the hollow shell, enhancing the uniformity of the microstructure and mechanical properties of the seamless metal pipes produced.
Implementation Method 1
the outer surface cooling mechanism ejects a cooling fluid toward an outer surface of the hollow shell... to cool the hollow shell inside the cooling zone
Data Source
AI summary
A piercing machine includes a plurality of skewed rolls, a plug, a mandrel bar and an outer surface cooling mechanism. The outer surface cooling mechanism is disposed around the mandrel bar at a position that is rearward of the plug, and with respect to an outer surface of a hollow shell advancing through a cooling zone which has a specific length in an axial direction of the mandrel bar and which is located rearward of the plug, as seen from an advancing direction of the hollow shell, the outer surface cooling mechanism ejects a cooling fluid toward an upper part of the outer surface, a lower part of the outer surface, a left part of the outer surface and a right part of the outer surface of the hollow shell to cool the hollow shell inside the cooling zone.