Common faults and maintenance of fully automatic drilling and tapping machine

Common problems and causes of drilling and tapping machines
1. Tap breakage: The diameter of the threaded bottom hole is too small during machining, resulting in poor chip removal and chip blockage; When the thread cannot be penetrated, the depth of the borehole is not sufficient; The cutting speed is too high or too fast when threading; The diameter of the tap used for threading is different from that of the threaded bottom hole; The selection of tap grinding parameters is inappropriate; The hardness of the processed parts is unstable; The tap has been used for too long and is excessively worn.
2. Tap tooth breakage: The front angle of the tap is selected too large; The cutting thickness of each tooth of the tap is too large; The quenching hardness of the tap is too high; The tap has been worn severely due to prolonged use.
3. Rapid wear of tap: cutting speed is too high when tapping threads; Inappropriate selection of tap grinding parameters; Improper selection of cutting fluid, insufficient cutting fluid; The material hardness of the workpiece is too high; During the grinding of the tap blade, there is a burning phenomenon. The diameter of the thread is too large. Improper selection of the precision level of the pitch diameter of the tap; Unreasonable cutting selection; The cutting speed of the threaded cutting is too high; The coaxiality difference between the tap and the threaded bottom hole of the workpiece; Inappropriate parameter selection for tap grinding; Burrs are generated in the grinding tap, and the cutting cone length of the tap is too short.
4. Thread pitch diameter too small: Improper selection of pitch diameter accuracy grade for tap; Unreasonable selection of grinding parameters for tap blades leads to wear of the tap; Inappropriate selection of cutting fluid.
5. The surface roughness value of the thread is too large: the selection of grinding parameters for the tap is not appropriate; The hardness of the workpiece material is too low; Poor quality of tap grinding: unreasonable selection of cutting fluid; Excessive cutting speed during thread tapping;