In the process of cutting, the cutting edge of the carbide cutter will be blunt and the cutting ability will be lost because of the sharp friction and the cutting heat of the knife surface. Only through grinding can the cutting edge sharp and the correct angle of the cutter be restored. Therefore, the lathe operator should not only know the cutting principle, but also select the tool angle knowledge reasonably.

When the carbide cutter is blunt, it must be sharpened to restore its reasonable shape and angle. The cutter is usually sharpened on a sand turbine. Grinding high speed steel tool with white alumina grinding wheel, grinding carbide turning tool with green silicon carbide grinding wheel.

When the carbide cutter is regrinding, it is possible to grind the relevant blade surface according to the wear condition of the carbide cutter. The general sequence of tool sharpening is as follows: grinding surface, grinding side, flank face, grinding surface and grinding wheel. When the carbide cutter is sharpened, it is also used to grind each knife face with oil stone. Thus, the service life of the turning tool can be effectively improved and the roughness of the workpiece surface can be reduced.

The position and method of grinding the carbide cutter are:

People stand on the side of the grinder to prevent debris from flying when it breaks.

The opening distance between the two hands is held, and the two elbow is clamped to the waist to reduce the jitter during grinding.

When grinding the main and secondary cutter surface, the carbide cutter should be placed in the horizontal center of the grinding wheel. The tip of the knife should be slightly upwards about 3 ~8 degrees, and the wheel should move horizontally in the left and right direction after contact with the grinding wheel. When the carbide cutter is away from the grinding wheel, the carbide cutter needs to be lifted up to prevent the sharpened blade from being bruised by the grinding wheel.

When grinding the cutter face, the end of the cutter head deviates from the angle of a main deflection to the left side, and the angle of the cutter shaft tail crosses the right side to a side deflection angle when grinding the flank face.

When the grinding tool tip is circular, the front end of the carbide cutter is usually supported by the left hand as the fulcrum, and the tail of the carbide cutter is rotated with the right hand.

When grinding the tool, we should pay attention to the following items:

(1) when sharpening, the two hands should stabilize the carbide cutter, and the cutter bar depends on the bracket, so that the worn surface is lightly attached to the grinding wheel. Do not exert too much force to avoid crushing the wheel and cause accidents.

(2) the sharpening tool should be moved around the circumference of the grinding wheel to make the grinding wheel uniform and no grooves. Avoid rough grinding of the carbide cutter on the two side of the grinding wheel, so that the wheel is forced to swing, beat, or even break.

(3) when the cutter head is heated, it should be cooled by water so as to avoid the annealing and softening of the cutter head due to the high temperature rise. When grinding carbide tools, the blade should not be covered with water so as to prevent the blade from being chilled and crack.

(4) do not stand on the front side of the grinding wheel to sharpen the carbide cutter to prevent the operator from being injured when the wheel is broken.

Posted by: hannahgwendolyn at 09:48 AM | No Comments | Add Comment
Post contains 616 words, total size 4 kb.