Mechanical cutting produced four basic

Mechanical cutting produced four basic

1, ribbon cuttings
Metal processing of plastic materials, when cutting small thickness, the cutting speed is higher, the rake angle is large, the general often get this type of chip. Its balance cutting process, cutting force less volatile, has a smaller surface roughness. Its smooth inner surface, an outer surface of the hairs.
2, seizing the chip
Such differences in the chip and the chip strip serrated outer faces, the inner surface sometimes cracks. Such chips are mostly lower in cutting speed, cutting large thickness, before the tool generated when the angle is small.
3, the chip unit
If the seizing of the chip cut surface, the crack extended to the entire surface, the entire unit is cut off, trapezoidal unit chips.
These three chips only as long as the processing of plastic materials can be obtained. In the meantime, the process of cutting the ribbon chips most stable unit chip shaken maximum cutting force. In the production of the most common is the ribbon cuttings, sometimes with seizing the chip, the chip unit is very rare. Suppose changes seizing the chip conditions, such as further reducing the tool rake angle, cutting speed to reduce or increase the cutting thickness, the chip unit can be obtained. On the contrary, it is possible to obtain strip-like chips. This shows that the shape of the chip is capable of cutting conditions and with the transformation. Its grasp to change the rules, it is possible to manipulate the chip deformation, shape and dimensions, in order to reach the volume of chips and chip-breaking intentions.
4, chipping chips
This is part of the chip brittle material. The shape of the chip is irregular, the machined surface is uneven. From the cutting process, the chip fracture before the deformation is small, and the plastic material of the chip formation mechanism is different. Its brittle fracture is mainly due to the stress the material beyond its tensile limit. Machining brittle materials, such as high-silicon cast iron, white cast iron, etc., especially when cutting large thickness often get this chip. Due to its very smooth cutting process, the tool is easy to destroy, but also detrimental to the machine, the machined surface and rough, so the production should strive to avoid. The method is to reduce the cutting thickness, the chips into a needle or flaky; while appropriately increasing the cutting speed to increase the plasticity of the workpiece material.
These are the four typical chip, but the chip processing site obtained its shape is varied. In modern machining, the cutting speed and metal removal rate reached a very high level, cutting conditions are harsh, often produce large amounts of "unacceptable" chips. The so-called chip control (also known as chip processing plant is generally referred to as "chip breaker"), it means taking appropriate measures to control the cutting chip curled outflow and break, forming an "acceptable" in good shape crumbs .