# Nonstandard Precision Machining# Turning Processing How to choose the cutting parameters for turning processing?

1. Workpiece material

• For materials with higher hardness and strength, smaller cutting speeds and feeds should usually be selected to reduce tool wear and cutting forces.

• For softer and easier-to-process materials, the cutting speed and feed can be appropriately increased to improve processing efficiency.

2. Tool material

• Carbide tools can withstand higher cutting speeds while HSS tools are suitable for lower cutting speeds.

• The coating of a tool also affects its cutting performance, with coated tools generally being able to operate at higher speeds.

3. Cutting depth

• During rough machining, if the machine tool and tool allow, a larger cutting depth should be selected to reduce the number of tool passes and improve processing efficiency.

• During finishing, the cutting depth is small, generally between 0.1 - 1mm, to ensure the quality of the machined surface.

4. Cutting speed

• You can refer to the recommended values ​​provided by the tool manufacturer and adjust according to the actual processing conditions.

• Generally speaking, increasing cutting speed can improve machining efficiency, but will increase tool wear and generate more cutting heat.

5. Feed amount

• Choose a larger feed rate when roughing to remove material quickly.

• Choose a smaller feed rate during finishing to obtain better surface roughness.

6. Machine tool performance

• Consider factors such as machine tool power, rigidity and accuracy. When the machine tool power is insufficient, excessively high cutting parameters cannot be selected.

7. Surface quality requirements

• When higher surface roughness is required, the cutting speed and feed should be reduced.

In actual processing, the cutting parameters can be initially determined through trial cutting, and then optimized and adjusted according to the processing effect. At the same time, cutting manuals, process databases and empirical formulas can also be used to assist in selecting cutting parameters.