Milling small parts
A circular milling cutter is the best choice for milling small parts (such as helical milling and milling ribs, or when the cutter diameter is close to the workpiece radius). The solid ring shape of this cutter can produce a chip thinning effect that allows it to be milled at a higher feed rate. In addition, the radius of the milling cutter is smaller than that of the conventional ball end mill, so it can increase the walking step, while still maintaining the flatness of the machined surface without the usual occurrence of the ball milling cutter Large knife marks.
The ring cutter is ideal for helical milling and milling ribs because the tool will inevitably produce more contact with the machined surface, while the use of double-edged circular milling cutters minimizes contact with the surface of the workpiece, Thereby reducing cutting heat and tool deformation. In these two machining, the circular milling cutter is usually closed in the cutting state, so the maximum radial walking step should be 25% of the diameter of the milling cutter, and each time the maximum Z direction of the knife should be cut 2% of diameter. In the helical milling hole, when the cutter is cut into the workpiece with the helical cutter rail, the spiral cutting angle is 2 ° – 3 ° until the Z direction of the cutter diameter is 2%.
If the ring cutter is open in the open state (such as milling the workpiece corner or cleaning the workpiece characteristics), the radial walking step depends on the hardness of the workpiece material. When the hardness of the workpiece is HRC30-50, the maximum radial walking step should be 5% of the diameter of the cutter; when the material hardness is higher than HRC50, the maximum radial walking step and the maximum Z The depth of cut is 2% of the diameter of the cutter.