cnc machine adopts stepper motor and single chip microcomputer to transform the turning feed system of ordinary lathe. It is suitable for the turning of rotary parts with low requirements. On the cnc machine, all the tools are pre-installed in the tool library, and the corresponding tool change action is carried out through the tool selection and tool change instructions of the CNC program. Its selection depends on the geometry of the part to be machined, the state of the material, the rigidity of the fixture and the tool selected by the machine tool. The following aspects should be considered:

1, Select the tool according to the cutting performance of the parts material

(1) Such as turning or milling high-strength steel, titanium alloy, stainless steel parts, it is recommended to choose indexable carbide tools with better wear resistance.

2, select the tool according to the processing stage of the part

(1) The roughing stage is mainly to remove the allowance, and the tool with better rigidity and lower accuracy should be selected.

(2) Semi-finishing, finishing stage to ensure the processing accuracy of parts and product quality, should choose high durability, high precision tools.

(3) The precision of the tool used in the roughing stage is low, and the precision of the tool used in the finishing stage is high.

(4) If the same tool is selected for rough and finish machining, it is recommended that the tool eliminated by finishing is selected for rough machining.

3, according to the characteristics of the processing area to select the tool and geometric parameters

(1) If the structure of the part allows, the tool with large diameter and small length-diameter ratio should be selected.

(2) Processing aluminum, copper and other soft material parts should choose a slightly larger front Angle of the end mill, the number of teeth should not exceed 4 teeth.

4. Select the tool according to the surface size of the workpiece to be machined

(1) In the production, the processing of the peripheral outline of the plane parts is often done with an end mill.

(2) When milling the plane, carbide blade milling cutter should be selected.

(3) When processing the boss and groove, choose high-speed steel end mill.

(4) When processing the blank surface or roughing the hole, the corn milling cutter with cemented carbide blade can be selected.

(5) For the processing of some vertical surface and variable bevel contour, ball end milling cutter, ring milling cutter, conical milling cutter and disk milling cutter are often used.

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