Cylindrical Grinding of Steel Bar
The Problem: A military tank manufacturer grinds the O.D. of a 1-1/4" (32mm) low carbon steel, cold rolled bar. Length of cut is 5" (127mm). Depth of cut is .001" (.03mm) per pass (rough grind) using a 100 grit wheel. The need to machine the part dry caused three problems—part burning due to heat build-up; frequent wheel dressing every .050" (1.3mm) of cut, and excessive wheel loading.
The Solution: A Model 5215 Cold Gun System was installed on the grinder. Depth of cut was increased to .008"(.20mm), with no part burning. Wheel loading was eliminated, due to lower surface temperatures and the Cold Gun’s ability to clear the wheel of dry residue. No wheel dressing was required during the entire operation.
Comment: Tool room operations such as this one benefit greatly from cold air cooling. Successful applications include tool and cutter grinding, carbide grinding and rechamfering. The Cold Gun’s low cost justified purchase of ten units in this case, one for each machinist's tool box.