Reasons and solutions for excessive milling cutter runou
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Reasons and solutions for excessive milling cutter runou
Coaxial error of each spindle journal, various errors of the bearing itself, coaxial error between the bearings, spindle deflection, etc. will affect the radial rotation accuracy of the spindle, thus causing radial runout of the tool.
Tool center and spindle rotation center inconsistency
Tool in the process of installation to the spindle, if the center of the tool and the spindle rotation center is not consistent, will also bring the tool radial runout. Specific influencing factors include the fit of the tool and collet, the correct method of loading the tool and the quality of the tool itself.
Specific machining process impact
Radial cutting force is the radial component of the total cutting force, which will aggravate the radial runout of the tool. Radial cutting force will make the workpiece bending and deformation and produce vibration during machining, is the main force affecting the quality of workpiece machining.
Select a larger front angle of the tool to make the tool sharper to reduce the cutting force and vibration. At the same time, choose a larger tool back angle, reduce the friction between the main back face of the tool and the elastic recovery layer of the transition surface of the workpiece, thus reducing vibration.
Increasing tool system stiffness
Increase the strength of the tool by increasing the diameter of the toolholder or reducing the tool's projection length, thereby reducing the radial runout of the tool.
Clean spindle taper bore and collet
Keep the spindle taper hole and collet clean from dust and residual chips generated during workpiece machining to reduce the radial runout of the tool.
Reasonable selection of tool draft
Unreasonable amount of tool draft will lead to constant changes in the amount of radial runout of the tool during machining, so it is necessary to choose appropriately according to the specific situation.
Use of reverse milling
Use reverse milling in finishing because the cutting thickness changes from small to large when reverse milling, the load on the tool also changes from small to large, and the tool is smoother when machining.
Proper use of cutting fluid
Proper use of cutting fluid can effectively reduce the cutting force, thus reducing the radial runout of the tool.
- Cause analysis
Coaxial error of each spindle journal, various errors of the bearing itself, coaxial error between the bearings, spindle deflection, etc. will affect the radial rotation accuracy of the spindle, thus causing radial runout of the tool.
Tool center and spindle rotation center inconsistency
Tool in the process of installation to the spindle, if the center of the tool and the spindle rotation center is not consistent, will also bring the tool radial runout. Specific influencing factors include the fit of the tool and collet, the correct method of loading the tool and the quality of the tool itself.
Specific machining process impact
Radial cutting force is the radial component of the total cutting force, which will aggravate the radial runout of the tool. Radial cutting force will make the workpiece bending and deformation and produce vibration during machining, is the main force affecting the quality of workpiece machining.
- The solution
Select a larger front angle of the tool to make the tool sharper to reduce the cutting force and vibration. At the same time, choose a larger tool back angle, reduce the friction between the main back face of the tool and the elastic recovery layer of the transition surface of the workpiece, thus reducing vibration.
Increasing tool system stiffness
Increase the strength of the tool by increasing the diameter of the toolholder or reducing the tool's projection length, thereby reducing the radial runout of the tool.
Clean spindle taper bore and collet
Keep the spindle taper hole and collet clean from dust and residual chips generated during workpiece machining to reduce the radial runout of the tool.
Reasonable selection of tool draft
Unreasonable amount of tool draft will lead to constant changes in the amount of radial runout of the tool during machining, so it is necessary to choose appropriately according to the specific situation.
Use of reverse milling
Use reverse milling in finishing because the cutting thickness changes from small to large when reverse milling, the load on the tool also changes from small to large, and the tool is smoother when machining.
Proper use of cutting fluid
Proper use of cutting fluid can effectively reduce the cutting force, thus reducing the radial runout of the tool.