Application indications and solutions for reaming
|
Problem |
Cause |
Solution |
|
Diameter is too large |
• Cutting speed is too high • Feed rate is too high • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Point is too short or very uneven • Tool or machine spindle rotation incorrect • Due to low-density or flexible structure, the working material enlarges |
• Reduce cutting speed • Reduce feed rate • Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition • Lengthen point or reduce point angle • Centrally clamp or guide the reamer. Use a reamer chuck • Reduce reamer diameter |
|
Diameter is too narrow |
• Cutting speed is too low • Feed rate is too low • Chip removal rate is too low • Point is too long • Tool is ground smooth • The working material is of high density or has an inflexible structure • Reamer of insufficient size • Too much heat created when reaming. Shrinking borehole • Tool diameter too small |
• Increase cutting speed • Increase feed rate • Increase machining allowance • Select a smaller point • Check the tool and replace in good time • Increase reamer diameter • Select a higher allowance • Increase lubricating coolant delivery • Select the correct diameter |
|
Heavy wear |
• Insufficient size |
• Select a larger diameter |
|
Borehole is not round or is conical |
• Incorrect positioning in the machine spindle • Alignment error between the tool and the borehole • Asymmetrical point angle • Incorrect tool run-out • Clearance angle too great • Point is not round • Insufficient guide |
• Check the spindle and correct its position • Use front-cutting reamers • Re-sharpen point angle • Centrally clamp tool, use reamer chuck and guide • Reduce clearance angle when re-sharpening • Evenly sharpen and round the point |
|
Poor surface quality |
• Worn tool • Front rake angle is too small • Cutting speed is too low • Feed rate is too low • Workpiece tends to stick (built-up edge) • Cutting exit is sharp-edged • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Cutting is uneven • Defective point |
• Replace or re-sharpen tool in good time • Re-sharpen correctly • Increase cutting speed • Increase feed rate • Increase clearance angle and front rake angle; use highly fluid lubricant • Round and smooth the borehole exit • Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition • Grind the point and guide piece to an evenly round shape or to a tapered shape • Finely smooth or lap the point round and smooth the guide piece joint |
|
The tool jams and breaks |
• Borehole is too narrow • Bevel width is too great • Shaft is too short • Worn tool |
• Reduce material cross-section • Check the tool and replace if necessary • Check the tool and replace if necessary • Replace or re-sharpen tool in good time |
|
Borehole exit too narrow |
• Feed rate when removing the reamer from the borehole is too high |
• Reduce feed rate shortly before passing through or use even feed rate |
|
Broken off or deformed driver |
• Incorrect position between shaft and clamping device |
• Keep shaft and clamping device clean and undamaged |