What is the case of tool wear in CNC milling machine processing? How to solve the problem if the workpiece has scratches?

In CNC milling machine processing often appear tool wear, damage, collapse edge. How does this happen? So what do you do when you do that? How do we distinguish tool wear in terms of wear patterns?

(1) Front knife surface damage

When cutting plastic material at a greater speed, the part of the front cutter face near the cutting force, under the action of chips, will wear into a crescent sag, so it is also called crescent sag wear. In the early stage of wear, CNC milling machine tool rake increase, so that the cutting conditions are improved, and conducive to the curl of the chip break, but when the moon sag further increase, the cutting edge strength is greatly weakened, and may eventually cause the cutting edge of the collapse of the damage. When cutting brittle materials, or plastic materials at lower cutting speeds and thinner cutting thickening, sag wear does not usually occur.

(2) Tool tip wear

The tool point wear is the wear of the back surface of the tool point arc and the adjacent auxiliary back surface, which is the continuation of the wear of the back surface of the tool. Because of the poor heat dissipation conditions here, stress concentration, so the wear rate is faster than after the knife surface, sometimes in the pair after the knife surface will form a series of spacing equal to the feed amount of small groove, called groove wear. They are mainly due to the hardened layer of the machined surface and the cutting lines. Groove wear is most likely to occur when cutting hard cutting materials with a high tendency to work hardening. The tool tip wear has the greatest influence on the surface roughness and machining accuracy of the workpiece.

(3) Rear knife face wear

When cutting plastic materials with large cutting thicknesses, the back face of the CNC milling tool may not contact the workpiece due to the presence of chip accumulation. In addition, usually after the knife surface will contact with the workpiece, and after the knife surface to form a rear Angle of 0 wear belt. Generally in the middle of the working length of the cutting edge, the wear of the back tool face is more uniform, so the wear degree of the back tool face can be measured by the width of the wear band of the back tool face of the section of the cutting edge.

CNC milling machine processing tool wear will affect the quality of the workpiece, then CNC milling machine processing workpiece scratches how to solve it?

1, see if you can change the CNC milling machine processing parameters, it is possible that the CNC milling machine processing parameters are not reasonable.

2, on the other hand, CNC milling machine machining center to avoid scratches is an effective way to use boring rather than drilling, the process choice is wrong.

3, the first to see the CNC milling machine machining center processing figure to know, if the CNC milling machine machining center of the thickness of the workpiece is not very thick, you can use a reamer.

4, it is also possible that the numerical control milling machine processing of your coolant water rate is slow and the amount of water is not enough, the chips can not be discharged.

5, CNC milling machine processing bit Angle grinding point, and drilling rate is too high.