The tooth shape is abnormal - the tooth surface is ridged

The tooth shape is abnormal - the tooth surface is ridged

main reason

The tooth profile error of the hob is too large or the teeth are incompetent, and the instantaneous speed changes greatly. There are four kinds of workpiece defects.

1) After the hob is sharpened, the tooth equalization is poor

2) The hob moves axially

3) The radial runout of the hob is large

4) The hob is blunt

Solution

The main method: focus on the grinding quality of the hob, the installation accuracy of the hob and the geometric accuracy of the machine tool spindle:

1) Control the grinding quality of the hob

2) Ensure the installation accuracy of the hob, and do not knock when installing the hob; the end face of the washer should be flat; the end face of the nut should be vertical; the inside of the taper hole should be clean; after the bracket is installed, no gap can be left

3) Review the rotation accuracy of the machine tool spindle, and repair and adjust the hob spindle bearing, especially the thrust washer

4) Replace the knife with a new one