Basic requirements for CNC milling tools

(1) The cutter rigidity is better

First, the need to use a large amount of cutting in order to increase production efficiency; second, to adapt to the characteristics of difficult to adjust the cutting amount in the process of CNC milling machine. For example, when there is a great difference in the machining allowances in various parts of the workpiece, the general-purpose milling machine can easily solve this situation by adopting a layered milling method, and the numerically controlled milling must proceed according to the path specified by the program and meet a large margin. It cannot be "strained" like a general-purpose milling machine, unless it can be considered in advance when programming, otherwise the milling cutter must return to the origin and start machining from the beginning by changing the cutting surface height or increasing the tool radius compensation value. However, this will inevitably lead to the use of empty knives in places where the margin is small, which will reduce the production efficiency. If the tool rigidity is better, it is not necessary to do so. In addition, when machining on a general-purpose milling machine, if it encounters a tool that is not strong enough, it is easier to detect and timely adjust the cutting amount from the aspects of vibration, feel, etc. to make up for it, and it is difficult to do when CNC milling. In the case of numerical control milling, it is often the case that the tool is broken and the workpiece is damaged due to poor rigidity of the milling cutter. Therefore, it is very important to solve the rigidity problem of the numerically controlled milling cutter.
(2) The durability of the milling cutter is higher. Especially when a milling cutter processes a lot of content, if the cutter is not durable and the wear is rapid, the surface quality and machining accuracy of the workpiece will be affected, and the change caused by the tool change will be increased. Adjusting the number of knives and counters can also cause the work surface to leave a knife step caused by tooling errors, which reduces the surface quality of the workpiece.

In addition to the above two points, the selection of the geometrical parameters of the cutting edge of the milling cutter and the chip removal performance are also very important. The formation of the built-up edge of the saw blade by the cutting blade is very scary in the numerical control milling. In short, according to the heat treatment state of the workpiece material being processed, the cutting performance and the machining allowance, the selection of a milling cutter with good rigidity and high durability is a prerequisite for making full use of the production efficiency of the CNC milling machine and obtaining a satisfactory processing quality.