Teach you how to choose a CNC Tools

Because CNC machine tools have the characteristics of high processing accuracy, high processing efficiency, concentrated processing procedures and few parts clamping times, higher requirements are put forward for the CNC tools used. In terms of tool performance, CNC tools should be higher than those used by ordinary machine tools.
When choosing a CNC tool, the standard tool should be selected first, and a variety of high-efficiency composite tools and special special tools can be selected when necessary. When choosing standard CNC tools, you should choose various advanced tools as much as possible based on the actual situation, such as indexable tools, solid carbide tools, ceramic tools, etc.
When choosing CNC machine tools for processing tools, the following issues should also be considered:
(1) The type, specification and accuracy grade of the CNC tool should be able to meet the processing requirements, and the tool material should be compatible with the workpiece material.
(2) Good cutting performance. In order to adapt the tool to be able to use a large backfeed and high feed rate when roughing or processing difficult-to-machine materials, the tool should have the ability to withstand high-speed cutting and powerful cutting. At the same time, the same batch of tools must be stable in terms of cutting performance and tool life, in order to realize tool change according to tool life or the CNC system to manage the tool life.
(3) High precision. In order to meet the requirements of high precision and automatic tool change of CNC machining, the cutting tools must have high accuracy. For example, the radial dimension accuracy of some integral end mills is as high as 0.005mm.
(4) High reliability. To ensure that no accidental damage and potential defects of the tool will affect the smooth progress of the processing in the CNC machining, the tool and the accessories combined with it must have good reliability and strong adaptability.
(5) High durability. CNC machining tools, whether in roughing or finishing, should have higher durability than those used in ordinary machine tools, so as to minimize the number of times of changing or grinding tools and tool setting, so as to improve the processing efficiency of CNC machine tools. And to ensure the quality of processing.
(6) Good chip breaking and chip removal performance. In CNC machining, chip breaking and chip removal are not handled manually like ordinary machine tools. Chips are easy to wrap around the tool and workpiece, which will damage the tool and scratch the machined surface of the workpiece, and even cause injury and equipment accidents. Affect the processing quality and the safe operation of the machine tool, so the tool is required to have better chip breaking and chip removal performance.
The choice of cutting tools is one of the important contents in the CNC machining process, which not only affects the machining efficiency of the machine tool, but also directly affects the machining quality of the parts. Because the spindle speed and range of CNC machine tools are much higher than that of ordinary machine tools, and the output power of the spindle is larger, compared with traditional machining methods, higher requirements are put forward for CNC machining tools, including high precision, high strength, and rigidity. Good, high durability, and requires dimensional stability, easy installation and adjustment. This requires reasonable tool structure, standardization and serialization of geometric parameters. CNC tools are one of the prerequisites for improving processing efficiency. Its selection depends on the geometry of the processed parts, material conditions, fixtures and the rigidity of the selected tools of the machine tool. The following aspects should be considered:
(1) Choose the tool according to the cutting performance of the part material. Such as turning or milling high-strength steel, titanium alloy, stainless steel parts, it is recommended to choose indexable carbide tools with good wear resistance.
(2) Select the tool according to the processing stage of the part. That is to say, the rough machining stage is mainly to remove the margin, and the tool with better rigidity and lower precision should be selected. The semi-finishing and finishing stages should mainly ensure the machining accuracy and product quality of the parts, and the high durability and high precision should be selected. For high cutting tools, the precision of the cutting tool used in the roughing stage is the lowest, and the cutting tool used in the finishing stage has the highest precision. If the same tool is selected for roughing and finishing, it is recommended to use the tool eliminated from the finishing process during roughing, because most of the tool wear out of the finishing process is slight wear of the blade, and the coating is worn and polished. Continued use will affect the finishing Machining quality, but the impact on rough machining is small.
(3) Select the tool and geometric parameters according to the characteristics of the processing area. When the part structure allows, the tool with large diameter and small ratio of length to diameter should be selected; the end edge of the over-center milling cutter for cutting thin-walled and ultra-thin-walled parts should have sufficient centripetal angle to reduce the cutting of the tool and the cutting part force. When processing soft material parts such as aluminum and copper, you should choose an end mill with a slightly larger rake angle, and the number of teeth should not exceed 4 teeth.