The parameter selection method for CNC turning of non-metallic materials

When CNC turning non-metallic materials, parameter selection needs to be combined with the material properties and processing requirements. The following are the parameter selection methods for different non-metallic materials:

Fiberglass reinforced plastic material

Tool material: Tungsten-cobalt cemented carbide YG6 and YG8 can be selected.

Tool angles: The rake Angle is 25° - 30°, the relief Angle is 10° - 20°, and the rest of the geometric angles are the same as those of general turning tools.

Organic glass

Tool materials: Commonly used ones include hard alloy steels such as YG6, YG8 and W18Cr4V, as well as high-speed steels.

Tool angles: Take the rake Angle as 30° - 40°, the relief Angle as 10° - 12°, and the rest of the angles are the same as those of general turning tools.

Brittle non-metallic materials (such as ceramics, etc.)

Cutting speed: Generally, it can be selected within the range of 50 to 100m/min. When the strength and hardness of the material are relatively low, a larger value can be taken; when the strength and hardness of the material are relatively high, a smaller value can be taken. Meanwhile, the areas where built-up tumors occur should be avoided as much as possible. The cutting speed area where built-up tumors are most likely to occur is 15-25 m/min. During intermittent cutting, to reduce the impact and vibration of the cutting, the cutting speed should be appropriately reduced.

Feed rate: During rough machining, it is selected based on the system response speed, interpolation operation speed and cutting efficiency of the CNC machine tool. Generally, F within the range of 0.3-1mm/r is chosen for rough turning. During fine machining, the feed rate of a general CNC lathe is usually controlled within the range of 0.05-0.30mm/r. In actual cutting operations, the feed rate multiple switch on the machine tool operation control panel can be adjusted according to the specific conditions of the cutting process.

Back cut depth: During rough machining, it can be selected at 5-10mm, which should be determined based on the specific quality of the blank. When semi-finishing, it is selected at 0.5-2mm, which is determined based on the processing stress and the precision of the finishing reference. When performing fine machining, select 0.1-0.4mm. The minimum value should be determined based on the sharpness of the tool tip. When the rigidity conditions of the process system are poor or the allowance of the blank is large and uneven, the rough machining can be carried out in several more passes.