Tungsten steel tool wear and preventive measures

Wear form

The basic law of milling cutter wear is similar to that of turning tools. The cutting thickness of high-speed tungsten steel milling cutters is small, especially when up-milling, the cutter teeth squeeze and slide more seriously on the surface of the workpiece, so milling cutter wear mainly occurs on the back. When milling steel parts with a tungsten steel face milling cutter, due to the high cutting speed, the chip slides at a high speed along the front, so at the same time the rear is worn, and the front also has smaller milling cutter wear.

The tungsten steel face milling cutter performs high-speed intermittent cutting, so that the cutter teeth are subjected to repeated mechanical and thermal shocks, resulting in cracks and fatigue damage of the cutter teeth. The higher the milling speed, the earlier and more severe this milling cutter wear will occur. Most tungsten steel face milling cutters lose their cutting ability due to fatigue damage. If the geometrical angle of the milling cutter is unreasonably selected or used improperly, and the strength of the cutter teeth is poor, the cutter teeth will wear out without cracks after the cutter teeth bear a great impact.

Preventive measures

(l) Reasonable selection of milling cutter blade grades: blade materials with high toughness, low sensitivity to thermal cracking, and good heat resistance and wear resistance should be used. For example: when milling steel, you can use YS30, YS25 and other brand inserts; when milling cast iron, you can choose YD15 and other brand inserts to prevent milling cutter wear.

(2) Reasonable selection of milling amount: under certain processing conditions, there is a safe working area that does not cause damage. Choosing Vc and ƒz in the safe working area can ensure the normal operation of the milling cutter and prevent the milling cutter from wearing.

(3) Reasonably choose the relative position between the workpiece and the milling cutter: Reasonably choosing the installation position of the face milling cutter plays an important role in reducing the wear of the face milling cutter.