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Treatment of tap wear
Jul 17, 2017

Tap the threaded hole machining, hole diameter is small, chip is not good due to clogging of the blind hole; thread when the drilling depth is not enough; tapping taper screw speed is too high too fast; the diameter of tap and the tap tapping tapping taper thread with different axis; tap sharpening parameters is not suitable workpiece hardness; instability; tap used for a long time, excessive wear.

The diameter of the bottom thread correctly; grinding edge inclination or selection of spiral fluted taps; drilling bottom hole depth to meet the prescribed standards; appropriate to reduce the cutting speed, according to the selection criteria; correction of taper thread tap and bottom tapping, ensure the coaxiality requirements, and selection of floating cone thread tapping chuck increases; the corner tap, shorten the length of the cutting cone; ensure the workpiece hardness to meet the requirements, the insurance holder; found the tap wear should be replaced.

Tap breaking

The selection of the front angle of the tap is too large; the cutting thickness of each tap is too large; the quenching hardness of the tap is too high; the tap is seriously worn.

Appropriately reduce the rake angle of the tap, increase the length of the cutting cone properly, reduce the hardness and change the tap in time.

Tap wear too fast

When tapping the taper thread, the speed is too high; the selection of grinding parameters is not appropriate; the choice of cutting fluid is improper; the use of the material is not enough; the material hardness of the workpiece is too high; when the tap grinding occurs, the phenomenon of burns occurs.

Reduce the cutting speed properly; reduce the front angle of the tap; lengthen the length of the cutting cone; select the lubricating cutting fluid; carry out proper heat treatment on the workpiece; and correct the grinding tap.

Tap diameter is too big

Tap in size precision improper selection of cutting fluid; unreasonable selection; tapping taper screw speed is too high; tap tap tapping and workpiece coaxiality deviation; grinding parameters are not appropriate tap edge grinding burrs; tap; tap cutting cone length too short.

Select the appropriate levels of precision tap diameter; and reducing the cutting speed selection of cutting fluid suitable; tapping taper thread taps and correcting the tap thread bottom hole coaxiality; floating chuck; reduce the rake angle and cutting cone angle; eliminate burr grinding taps generated, and to appropriately increase the length of the cutting cone.

Tap diameter is too small

The accuracy of the middle diameter accuracy of the tap is not proper; the tap grinding parameter is not suitable; the tap is worn; the cutting fluid is unsuitable to be chosen.

Select the middle diameter of the suitable precision grade; appropriately increase the rake angle and cutting taper of the tap; replace the worn out tap; choose the lubricating cutting fluid.

Tap thread has a large surface roughness

The grinding parameters of tap are not suitable; the material hardness of workpiece is too low; the quality of tap grinding is poor; the choice of cutting fluid is improper; the tapping speed of tapping thread is too high; the tap is worn out.

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