How to Reverse the Rougher in a Hot Strip Mill
A hot strip mill generally includes at least one reversing roughing mill along with a finishing train. The reversing mill is spaced from the finishing mill by a distance slightly greater than the length of the transfer bar on the penultimate pass. The reversing mill is also spaced less than the distance of the final pass through the roughing reversing mill. This is performed so that the apparatus is close coupled to the finishing train on the last pass. Running a reverse rougher can be accomplished with minimal difficulty.
Instructions
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Secure the workpiece on the mill. Set the mill to the desired angles and run speed that you need to perform the job.
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Set the reversing mill to the idle speed as indicated on the mill instructions. As all mills vary according to idle speed, consult your manual for specifics.
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Set the finishing train to the appropriate angular parameters for your specific job. Lock the train into secure position.
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Run the workpiece through the mill for the first pass. Lower the rougher and make the pass over the workpiece. Increase speed as needed to make the pass smoothly.
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Reset the workpiece. Set the rougher on the reverse setting for the final pass. Typically this includes simply pressing the reverse mode button. As all mills vary, this may also include locking a chuck onto the rougher and resetting the grind wheel manually. Consult your manual for specifics.
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Tips & Warnings
Note that a reverse rougher expends more energy and can cause fire-cracking if not properly set flush against the workpiece. Gently lower the rougher until contact is made then work down as needed.
Use extreme caution handling machine tools.
Always wear appropriate safety equipment when operating a mill.
References
- Milling: A Complete Course; Harold Hall
- Tabletop Machining; Joe Martin
