1. Reasons for the milling cutter itself
(1) The milling cutter has become dull or there is a gap or other damage on the teeth.
(2) After the milling cutter is sharpened, the grinding stone is not carefully polished by the oil stone or the grinding is not smooth or the coarseness of each tooth grinding is inconsistent.
After the milling cutter teeth are sharpened on the tool grinding machine, the magnifying glass can be used to observe the cutting edge to find different degrees of jagged shape. Therefore, the grinding of the milling cutter after careful grinding with the oil stone is very beneficial to improve the smoothness of the surface to be processed.
2. Reasons for milling usage The milling usage is not properly selected, such as too much feed or uneven feed.
3. Reasons for processing
(1) Vibration or workpiece chattering during milling.
(2) The knife is too shallow, the cutter and the workpiece are not being cut, but are slipping and rubbing, so that the cut surface is not smooth.
(3) When feeding longitudinally or vertically, the brake handle of the horizontal table is not tightened, and the position of the table moves during machining and the instability occurs.
(4) When the milling cutter rotates, it will jump and the swing will be too large.
(5) The cutting fluid is not used properly.
(6) The cutting methods of down milling and up milling are not selected. If the table in the milling process suddenly moves, a deep groove or the like is formed on the surface to be cut.
4. The role of lubrication
Friction occurs when the guide rails on the milling machine and the bottom of the slide, gears and gears, shafts and holes, bearing balls (rollers) and raceways, and other contact surfaces move relative to each other. Friction can cause the parts to wear gradually, and the contact surface is heated or even damaged. In order to reduce the frictional resistance between the relative movements, maintain the accuracy of the lathe and the transmission efficiency, and extend the service life of the lathe, the best way is to lubricate the moving surface. 