CNC tools are used in high-performance and high-precision CNC machine tools. In order to achieve stable and good processing efficiency, CNC tools generally have higher requirements than ordinary tools in terms of design, manufacture and use. The main difference between CNC tools and blades is in the following aspects.
(1) High-precision manufacturing quality
In order to stably process the surface of high-precision parts, stricter requirements than ordinary tools are put forward for the manufacture of tools (including tool parts) in terms of accuracy, surface roughness, and geometric tolerances, especially indexable tools. The repeatability of the size of the insert tip (cutting edge) after indexing, the size and accuracy of the key parts such as the cutter body groove and positioning parts, and the surface roughness must be strictly guaranteed. And dimensional measurement, the base surface machining accuracy should also be guaranteed.
(2) Optimization of tool structure
The advanced tool structure can greatly improve the cutting efficiency. For example, high-speed steel CNC milling tools have adopted wave-shaped edges and large helix angle structures in structure. The replaceable and adjustable structure, such as the internal cooling structure, cannot be applied by ordinary machine tools. (3) Wide application of high-quality materials for cutting tools
In order to prolong the service life of the tool and improve the strength of the tool, high-strength alloy steel is used for the tool body material of many CNC tools, and heat treatment (such as nitriding and other surface treatment) is carried out, so that it can be suitable for large cutting amount, and the tool life is also short. can be significantly improved (normal knives generally use quenched and tempered medium carbon steel). As for the cutting edge material, CNC cutting tools use various new grades of cemented carbide (fine particles or ultrafine particles) and superhard tool materials. (4) Selection of reasonable chip breaker
The tools used in CNC machine tools have strict requirements on chip breakers. During processing, if the tool does not chip, the machine tool cannot work normally (some CNC machine tools and cutting are carried out in a closed state). Therefore, regardless of CNC turning, milling, drilling or boring machines, the blades are optimized for different processing materials and procedures. Reasonable cutting. The chip geometry enables stable chip breaking during cutting. (5) Coating treatment on the surface of the tool (blade)
The emergence and development of tool (blade) surface coating technology is mainly due to the emergence and development of CNC tools. Since coating can significantly improve tool hardness, reduce friction, improve cutting efficiency and service life, more than 80% of all kinds of carbide indexable CNC tools have adopted coating technology. The coated carbide inserts can also be used for dry cutting, which also creates favorable conditions for environmental protection and green cutting.