What is a milling cutter?
A milling cutter is a rotating tool with one or more teeth used for milling machining. During work, each blade intermittently cuts off the remaining amount of the workpiece in sequence. Milling cutters are mainly used for machining flat surfaces, steps, grooves, formed surfaces, and cutting workpieces on milling machines.
So how to choose a milling cutter?
1、 Determine the primary skill parameters for milling cutters:
The main parameters of carpenter milling cutters are tool outer diameter, machining thickness, and intermediate aperture
Other skill parameters: number of teeth, reverse deviation, reverse speed, feed rate, clamping method, teeth data.
2、 The selection of the construction method for milling cutters is based on the nature and requirements of the cutting object, and comprehensive consideration is given to the selection of all milling cutters, welding all milling cutters, assembly milling cutters, and combination milling cutters from both technical and economic perspectives.
3、 Selection of milling cutter reverse bias
The reverse bias of milling cutters is determined based on the reverse bias of the machining machinery spindle and the relative position between the tool axis and the feed workpiece. Whether it is a complete milling cutter or an assembled milling cutter, the inclination angle of the cutting edge relative to the milling cutter radius determines the reverse bias of the milling cutter.
4、 Selection of cutting parameters for milling cutters
The cutting parameters of a milling cutter include the cutting speed of the milling cutter, the feed rate of the workpiece, and the milling depth. The cutting speed of a milling cutter depends on its rotational speed and radius. The feed rate of the workpiece depends on the requirements for the surface quality of the cutting process. The roughness of the surface of the workpiece being cut largely depends on the feed rate per tooth of the milling cutter during the cutting process. If the feed rate per tooth is too large, the machined surface will be too rough and rough, or if the feed rate per tooth is too small, the machined surface will appear burnt. Therefore, the feed rate per tooth of the milling cutter must be appropriate.
5、 The invariance of milling cutter operation
The invariance of milling cutter operation is the foundation for ensuring machining accuracy and surface quality. This includes two aspects: first, the milling cutter vibrates during cutting due to external forces; The second is that the milling cutter deforms under the effect of external force.
6、 The safety of milling cutter processing
The safety of milling cutter processing includes limitations on milling cutter reverse speed, chip thickness, height of formed milling cutter profile, and thickness and protrusion of assembled milling cutter inserts.
The characteristics of wood cutting processing are high-speed cutting, with milling cutters having a reverse speed of over 3000rpm. High speed cutting brings high production efficiency and bright appearance quality to wood cutting processing. Moreover, it also brings a series of safety issues, so when millingMachine toolWhen the spindle speed reaches 9000rpm, except for handle milling cutters with cutting tools less than 16mm, the use of assembled milling cutters should be prohibited, and strict inspection and reflection should be carried out on the welds of all milling cutters.
The limitation of chip thickness is an essential method for dealing with severe overloading of milling cutters caused by excessive feed rate of the milling cutter.
There is a close relationship between the height value of the formed contour profile and the clamping method of the milling cutter, the thickness of the cutting workpiece, and the diameter of the milling cutter. After determining the thickness of the machined workpiece, the diameter of the milling cutter, and the intermediate aperture, the height of the milling cutter profile reflects the strength and stiffness of the milling cutter itself, as well as its ability to accept cutting resistance. Therefore, it is necessary to limit the height of the profile to ensure the safety of the milling cutter during use.
When designing the assembly milling cutter body, it is necessary to consider the clamping problem of the blade. Whether it is a cylindrical or disc-shaped blade body, the clamping method of the blade must ensure that it can provide sufficient clamping force to resist the reverse centrifugal force.