Dongguan Yilian Hardware Technology Co., Ltd
15 years professional Connector accessories, water-cooled module accessories experience

The selection of cutting tools for accessory processing is one of the important contents in CNC machining technology, which not only affects the efficiency of CNC machine tool processing, but also directly affects the quality of accessory processing. Due to the much higher spindle speed and range of CNC machine tools compared to ordinary machine tools, as well as the larger spindle output power, higher requirements are placed on CNC machining tools compared to traditional machining methods, including high precision, strength, rigidity, durability, dimensional stability, and easy installation and adjustment. The characteristics of the CNC machine tool spindle drive system are introduced. This requires a reasonable structure, standardized geometric parameters, and serialization of cutting tools. Numerical control cutting tools are one of the prerequisites for improving machining efficiency, and their selection depends on the geometric shape, material state, fixture, and tool rigidity of the workpiece being machined. The following aspects should be considered:

(1) Select the cutting tool based on the cutting performance of the accessory processing material. For cutting or milling high-strength steel, titanium alloy, and stainless steel parts, it is recommended to choose hard alloy tools with good wear resistance that can be rotated.

(2) Select cutting tools based on the processing stage of hardware parts. In the rough machining stage, the main focus is on removing excess material, and tools with good rigidity and low precision should be selected. In the semi precision machining and precision machining stages, the main focus is on ensuring the machining accuracy and product quality of the parts. Tools with high durability and precision should be selected. The precision of the tools used in the rough machining stage is the lowest, while the precision of the tools used in the precision machining stage is the highest. If the same tool is selected for rough and fine machining, it is recommended to use the tool eliminated from fine machining during rough machining, because the wear of the tool eliminated from fine machining is mostly slight wear on the cutting edge, coating wear and polishing. Continuing to use it will affect the machining quality of fine machining, but the impact on rough machining is relatively small.

(3) Select cutting tools and geometric parameters based on the characteristics of the machining area of the CNC lathe. If the part structure allows, tools with large diameters and small aspect ratios should be selected; The over center milling cutter end for cutting thin-walled and ultra-thin wall parts should have sufficient centripetal angle to reduce the cutting force on the tool and cutting area. When processing softer material parts such as aluminum and copper, a slightly larger front angle end mill should be selected, and the number of teeth should not exceed 4.

When selecting a cutting tool, the size of the tool should be adapted to the surface size of the workpiece being machined. In production, end mills are often used to process the contour around flat parts; When milling flat surfaces, a hard alloy blade milling cutter should be selected; When processing protrusions and grooves, choose high-speed steel end mills; When processing the rough surface or rough machining holes of hardware accessories, a corn milling cutter with hard alloy inserts can be selected as an option; Ball end milling cutters, ring milling cutters, cone milling cutters, and disc milling cutters are commonly used for machining some three-dimensional surfaces and variable angle profile shapes.

When performing freeform surface machining, due to the zero cutting speed of the end of the ball end tool, in order to ensure the accuracy of CNC machining, the cutting line spacing is generally very small. Therefore, ball end milling cutters are suitable for precision machining of surfaces. However, end mills are far superior to ball end mills in both surface machining quality and machining efficiency. Therefore, while ensuring that parts are not cut during machining, end mills are preferred for rough and semi precision machining of curved surfaces. In addition, the durability and accuracy of cutting tools are closely related to tool prices. It must be noted that in most cases, choosing good cutting tools increases tool costs, but the resulting improvement in machining quality and efficiency can greatly reduce the overall machining cost.

On the machining center, all cutting tools are pre installed in the tool magazine, and corresponding tool changing actions are carried out through the tool selection and tool changing instructions of the CNC program. It is necessary to select corresponding standard tool holders that are suitable for the specifications of the machine tool system, so that CNC machining tools can be quickly and accurately installed on the machine spindle or returned to the tool magazine. Programmers should be able to understand the structural dimensions, adjustment methods, and adjustment range of the tool holder used in the machine tool, in order to ensure the determination of the radial and axial dimensions of the tool and the reasonable arrangement of the tool arrangement sequence during programming.

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