Adjustment of cutting parameters of end mills in the processing of bicycle parts

In the processing of bicycle parts, the adjustment of cutting parameters of end mills needs to be combined with the material of the tool, the material of the workpiece and the processing requirements. The following is a specific analysis:

Cutting speed selection: The cutting speed depends on the material of the workpiece being processed and the tool life requirements. When processing aluminum alloys, the cutting speed can be set at 150-200m/min. When processing stainless steel, it needs to be reduced to 50-100m/min. When tool life is given priority, the cutting speed can be appropriately reduced. When the chip’s removal from the cutting edge is not good, the cutting speed can be appropriately increased.

Feed rate adjustment: The feed rate mainly depends on the material of the workpiece being processed and the diameter of the end mill. When processing aluminum alloy, it is recommended that the feed rate be 0.1-0.2mm per tooth. When processing stainless steel, it is necessary to control it within 0.05-0.1mm per tooth. In the rough machining stage, the feed rate can be appropriately increased to improve efficiency, while in the finish machining stage, the feed rate needs to be reduced to ensure machining accuracy and surface quality.

Cutting depth planning: In the rough machining stage, the single cutting depth is recommended not to exceed 50% of the tool diameter, while in the finish machining stage, it should be controlled within the margin range of 0.05-0.1mm. Dimensional accuracy is guaranteed through a layer-by-layer processing strategy. In the CNC milling of the cavity of molds and other workpieces, when the cutting point is a concave part or a deep cavity, the extension of the end mill needs to be increased. At this time, the cutting depth should be reduced.

Tool clamping and vibration control: Most end mills used in machining centers adopt the spring clamp clamping method. Before clamping, the shank part of the end mill and the inner hole of the tool holder should be thoroughly cleaned with cleaning solution, dried, and then clamped. When the diameter of the end mill is large, a tool holder with a flattening notch and the corresponding side locking method should be selected. When tool vibration occurs, it is necessary to consider reducing the cutting speed and feed rate. If significant vibration still exists after both have been reduced by 40%, the depth of cut should be reduced.

Cutting method selection: Using climb milling is beneficial for preventing blade damage and can increase tool life. However, two points need to be noted: If ordinary machine tools are used for processing, efforts should be made to eliminate the clearance of the feed mechanism; When there are residual oxide films or other hardened layers formed by casting or forging processes on the surface of the workpiece, reverse milling is recommended.