Page 40 - ISCARs-solutions-for-Heavy-Machining-2022
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Drilling Tool Wear
HEAVY
Edge Chipping Land Wear
Cause Cause
• Low wear resistance Carbide grade • Cutting speed too high
• Built-up edge has been formed • Low wear resistance Carbide grade
• Insufficient coolant fluid • Radial run-out is too high
Remedy Remedy
• Reduce feed rate • Check that the correct geometry is used
• Increase cutting speed • Check that T.I.R. run-out does not
• Increase coolant pressure exceed 0.02 mm (.0008”)
• Improve jet direction in case of external coolant supply • Reduce cutting speed
• Change to different geometry • Increase coolant pressure
• Check tool and part clamping rigidity • Improve jet direction in case of external coolant supply
• Check and improve tool and part clamping rigidity
• Check if pocket gripping forces are too
low - if so, replace the tool body
Corner Fracture Corner Chipping
Cause Cause
• Caused by excessive insert wear • Radial run-out is too high
before indexing the insert • Insufficient coolant fluid
• The grade and geometry may be too Remedy
weak for the applications
• Excessive load on the insert • Check radial run-out
• Built-up edge has been formed on the insert • Reduce feed rate, increase the speed
• Check tool and part clamping rigidity
Remedy • Check if pocket gripping forces are too
• Check radial run-out low - if so, replace the holder
• Reduce feed rate • Increase coolant pressure
• Increase the speed • Improve jet direction in case of
• Check tool and part clamping rigidity external coolant supply
• Check if pocket gripping forces are
too low, replace the holder
• Increase coolant pressure
• Improve jet direction in case of external coolant supply
Chisel Chipping Built-up Edge
Cause Cause
• Chisel run-out is too big • Cutting zone temperature is too low
• Combination of high feed and low speed • Negative cutting geometry
Remedy • Machining of very sticky materials such as
• Reduced feed rate and increased cutting speed low-carbon steel, stainless steels, and aluminum
• Check that chisel misalignment does Remedy
not exceed 0.02 mm (.0008”) • Increase feed
• Check tool and part clamping rigidity • Increase cutting speed
• Check if pocket gripping forces are too • Increase coolant pressure
low - if so, replace the holder • Check oil percentage in the coolant fluid
40 ISCAR
