How to Control Chip during Dongguan Turning and Milling Compound Processing

During Dongguan turning and milling composite processing, the chips undergo severe deformation in the deformation zone, resulting in an increase in hardness, a decrease in plasticity, and brittle performance. During the chip discharge process, when encountering obstacles such as the back face of the tool, the transition surface of the workpiece, or the surface to be machined, if the strain in a certain part exceeds the fracture strain value of the chip material, the chip will break.

The greater the brittleness of the workpiece material (lower fracture strain value), the greater the cutting thickness, and the smaller the cutting curl radius, the easier the chips are to break. The following measures can be taken to control chips:

1. Use a chip breaking groove. By setting a chip breaking groove to exert a certain constraint on the chips in the flow, the chip strain increases and the chip curling radius decreases.

2. Change the tool angle. Increasing the main deviation angle of the cutting tool increases the cutting thickness, which is beneficial for chip breaking. Reducing the tool rake angle can increase chip deformation and make chips easy to break. The inclination angle of the blade can control the flow direction of the chips. When the inclination angle of the blade is positive, the chips often break and form C-shaped chips or naturally flow out to form spiral chips after being curled; When the inclination angle of the cutting edge is negative, the chips often break off and form C-shaped or 6-shaped chips when they curl up on the machined surface.

Adjust the cutting amount. Increasing the feed rate F increases the cutting thickness, which is beneficial for chips; But increasing F will increase the machined surface roughness value. Reducing the cutting speed appropriately to increase deformation is beneficial for chip breaking, but it will reduce the cutting efficiency of the material. Therefore, the cutting amount must be appropriately selected based on the actual conditions of Dongguan turning milling composite processing.