Guarantee 5 Factories to Control Cutting Load in Milling(二)

Cutting Thickness of carbide inserts

Chip thickness can have a huge impact on heat and tool life. If the chip thickness is too large, the heavy load caused will generate excessive heat and chips, and even cause the cutting edge to break. The chip thickness is too small, and the cutting process is only performed on the smaller part of the cutting edge, and the friction and heat increase Will cause rapid wear.

The thickness of the chips produced in milling will continue to change as the cutting edge enters and exits the workpiece. Therefore, the tool supplier adopts the concept of "average chip thickness" to calculate the tool feed to maintain the most efficient chip thickness.
The factors involved in determining the correct feed include: the engagement arc or radial depth of cut of the tool and the entering angle of the cutting edge. The larger the meshing arc is , the smaller the feed required to produce the ideal average chip thickness. Similarly, the smaller the engagement arc of the tool is , the higher the feed rate is required to obtain the same chip thickness. The entering angle of the cutting edge of the tool also affects the feed requirements.

When the cutting edge deflection angle is 90°, the chip thickness is the largest. Therefore, in order to achieve the same average chip thickness, reducing the cutting edge entering angle requires increasing the feed rate.

Cooling

The way to control the heat generated in metal cutting is to control the application of coolant. Excessive temperature will cause rapid wear or deformation of the cutting edge, so the heat must be controlled as soon as possible. In order to effectively reduce the temperature, the heat source must be cooled.