The machining center is a CNC milling machine with a tool magazine. The tool is an important part of the machining center, and it is also the easily damaged part in daily operations. Is the harder the knife the better? Although knives are hard, they can also wear out over time. Is the harder the knife the better? , which is not actually the case. What are the reasons that affect tool wear? The editor has drawn several reasons through the summary, and listed the solutions, everyone quickly collects it.

Tool material

CNC tool material is the fundamental factor that determines the cutting performance of the tool, which has a great influence on the processing efficiency, processing quality, processing cost and tool durability. The harder the tool material, the better its wear resistance, the higher the hardness, the lower the impact toughness, and the more brittle the material is. Hardness and toughness are a pair of contradictions, and it is also a key that tool materials should overcome. For graphite tools, ordinary TiAlN coatings can be appropriately selected with relatively better toughness, that is, with a slightly higher cobalt content; for diamond-coated graphite tools, materials with relatively better hardness can be appropriately selected. , that is, the cobalt content is slightly lower;

The geometric angle of the tool

Selecting the appropriate geometric angle of the graphite tool helps to reduce the vibration of the tool, and conversely, the graphite workpiece is not easy to chip;

Rake angle, when using negative rake angle to process graphite, the cutting edge strength of the tool is good, and the impact resistance and friction performance are good. The overall trend is decreasing. When machining with positive rake angle, as the rake angle increases, the strength of the tool edge is weakened, which leads to increased flank wear. When machining with a negative rake angle, the cutting resistance is large, which increases the cutting vibration. When machining with a large positive rake angle, the tool wear is serious and the cutting vibration is also large.

The clearance angle, if the clearance angle increases, the strength of the tool edge will decrease, and the wear area of ​​the flank face will gradually increase. When the tool clearance angle is too large, the cutting vibration is strengthened.

Helix angle, when the helix angle is small, the length of the same cutting edge cutting into the graphite workpiece at the same time is the longest, the cutting resistance is the largest, and the cutting impact force on the tool is the largest, so the tool wear, milling force and cutting vibration are the largest. . When the helix angle is larger, the direction of the milling resultant force deviates from the surface of the workpiece to a greater extent, and the cutting impact caused by the collapse of the graphite material intensifies, so the tool wear, milling force and cutting vibration also increase. Therefore, the influence of tool angle change on tool wear, milling force and cutting vibration is generated by the combination of rake angle, clearance angle and helix angle, so more attention must be paid to the selection.

By doing a lot of scientific tests on the machining characteristics of graphite materials, PARA tools optimize the geometric angle of the relevant tools, so that the overall cutting performance of the tools is greatly improved.

Conclusion

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