Several factors affecting the purchase choice of CNC tools

Because CNC machine tools have the characteristics of high machining precision, high machining efficiency, concentrated machining process and few parts clamping times, higher requirements are imposed on the CNC tools used. In terms of tool performance, CNC tools should be higher than those used in ordinary machine tools.

When selecting a CNC tool, the first choice is to use the standard tool first. If necessary, you can use a variety of high-efficiency compound tools and special special tools. When selecting a standard CNC tool, it should be combined with the actual situation, as far as possible to choose a variety of advanced tools, such as indexable tools, solid carbide tools, ceramic tools.

When choosing a CNC machine tool, you should consider the following aspects:

(1) The type, specification and accuracy level of the CNC tool should be able to meet the machining requirements, and the tool material should be compatible with the workpiece material.

(2) Good cutting performance. In order to adapt to the tool's large backing and high feed rate during roughing or machining of difficult-to-machine materials, the tool should be able 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 achieve tool change according to tool life or to manage tool life by CNC system.

(3) High precision. In order to meet the requirements of high precision and automatic tool change of CNC machining, the tool must have high precision, such as the radial size accuracy of the integral end mill up to 0.005mm.

(4) High reliability. It is necessary to ensure that the tool will not be accidentally damaged and potential defects in the CNC machining, which will affect the smooth progress of the machining. It is required that 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 ordinary machine tools, in order to minimize the number of replacement or grinding tools and tooling, thus improving the machining efficiency of CNC machine tools. And guarantee the quality of processing.

(6) Good chip breaking and chip discharging performance. In CNC machining, chip breaking and chip removal are not handled manually by ordinary machine tools. Chips are easily entangled on tools and workpieces, which can damage the tool and scratch the machined surface, and even cause injury and equipment accidents. Affects the quality of the machine and the safe operation of the machine tool, so the tool is required to have better chip breaking and chip removal performance.

When choosing the type and specification of the tool, the main factors are considered:

(1) Nature of production

The production property here refers to the batch size of the parts, mainly considering the influence on the tool selection from the processing cost. For example, the use of special tools in mass production may be cost-effective, while in single or small batch production, the choice of standard tools is more suitable.

(2) Machine type

The effect of the CNC machine used to complete the process on the selected tool type (drill, turning or milling). High productivity tools such as high speed cutting tools and large feed turning tools are allowed under the condition that the workpiece system and the tool system are rigid.

(3) CNC machining plan

Different types of tools can be used for different CNC machining solutions. For example, the machining of holes can be done with drills and reamers, or with drills and boring tools.

(4) Size and shape of the workpiece

The size and shape of the workpiece also influences the choice of tool type and specification. For example, special surfaces are machined with special tools.

(5) Machining surface roughness

The surface roughness of the machined surface affects the shape and cutting amount of the tool. For example, when rough roughing is used, a coarse-tooth milling cutter can be used, and a fine-tooth milling cutter is preferred for finishing.

(6) Machining accuracy

Machining accuracy affects the type and shape of the finishing tool. For example, the final machining of the hole can be processed by drilling, reaming, reaming or boring according to the accuracy of the hole.

(7) Workpiece material

The workpiece material will determine the choice of the tool material and the geometry of the cutting part. The tool material is related to the machining accuracy of the workpiece and the material hardness.

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