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Technological method of milling with numerical control tool shank milling cutter

Posted by: Chris Na 2021-05-26 Comments Off on Technological method of milling with numerical control tool shank milling cutter

The following introduces the process methods of cnc tool holder milling cutter milling, mainly as follows:

Climb milling and up milling

Most surface milling is done by up-milling on light-duty machine tools with lead screws or ball screws. However, down milling should be used as much as possible to achieve better processing results. Therefore, during up-milling, strong friction is generated before the blade cuts, which hardens the machined surface and makes it difficult for the next tooth to cut. When down milling, the milling width should be approximately equal to 2/3 of the milling cutter’s diameter. This ensures that the cutting edge can cut into the workpiece immediately, with almost no friction. If it is less than 1/2 the diameter of the milling cutter, the insert begins to “friction” the workpiece, because the cutting thickness becomes smaller when cutting, and the feed per tooth will also be reduced due to the narrowing of the radial cutting width.” The result of “friction” shortens the tool life. For cemented carbide tools, it is more advantageous to increase the feed per tooth and reduce the depth of cut. Therefore, in rough milling, if the radial cutting width is less than the radius of the milling cutter, increase the pass The tool life will be increased and the processing time will be shortened. Of course, finishing milling requires a smooth surface of the workpiece, so the amount of cutting should be limited.

Trial adjustment of this radial milling width, the work of determining the ratio of the milling cutter diameter to the radial milling width is best performed on a high-precision machine tool, so that while adjusting the ratio, observe the changes in the surface roughness of the workpiece.

Evaluation of milling efficiency

The efficiency of face milling can be measured in many ways. One is to determine the amount of metal removal per minute, namely: WOC (width of cut) * DOC (depth of cut) * FR (cutting amount). Such as 3*(WOC)*0.15 inches (DOC)*3.5 inches/min FR=15.75 cubic inches/min. The metal removal rate represents the volume of metal cut. Whether the machine power used can achieve this removal rate depends on the hardness of the metal being processed. So there is another way to measure it, which is to directly calculate the required momentum for milling. It is equal to: metal removal rate * material hardness coefficient. For example: aluminum hardness coefficient is about 0.3, the required power is 15.75*0.3=4.275 (horsepower); 4140 steel hardness coefficient is about 0.7, the required power is 15.75*0.7=11 (horsepower), the hardness coefficient can be found in the relevant manuals , Information, etc.