A detailed analysis of the advantages and range of commonly used milling cutters

A detailed analysis of the advantages and range of commonly used milling cutters

A milling cutter is a rotary cutter with one or more teeth. Each tooth is equivalent to a cutter fixed on the turning surface of the milling cutter. At the same time, the cutting edge is longer and has no empty travel, and the Vc is higher, so the productivity is higher. There are many kinds of milling cutters with different structures and wide application range. According to their USES, they can be divided into three categories, such as milling cutters for plane machining, milling cutters for groove machining and milling cutters for forming surface machining. The general specification of milling cutter has been standardized, generally produced by a professional tool factory. This article introduces the characteristics of several commonly used milling cutters and their usage direction.

Cylindrical milling cutters are generally made of high speed steel. Helical cutting edges are distributed on the surface of the cylinder. There is no auxiliary cutting edge. Mainly used for horizontal milling machine on the width less than milling cutter length of the long plane.

According to the different processing requirements, cylindrical milling cutter has coarse teeth, serrated teeth, the chip groove of coarse teeth, for rough machining, for fine teeth. When the outside diameter of a milling cutter is larger, it is often made into insert teeth.

The main cutting edge is distributed on the surface of cylinder or cone, the end cutting edge is the auxiliary cutting edge, and the axis of the milling cutter is perpendicular to the processed surface. According to the material of cutter teeth, it can be divided into high speed steel and hard alloy, and it is mostly made into sleeve insert structure. The material of cutter body is 40Cr.

Compared with high speed steel milling cutters, carbamide surface milling cutters have high milling speed and good surface quality. There are three types of cemented carbides surface milling cutter: integral type, machine clamp-welding type and transposable type.

Face milling cutter is mainly used in vertical milling machine or a horizontal plane and plane milling machine processing steps, especially suitable for large flat processing, the Angle is 90 ° the steps of face milling cutter can be wider at the bottom of the milling surface. The surface milling cutter is used to process the plane, and there are many cutter teeth involved in cutting at the same time, and it also has the polishing effect of the auxiliary cutting edge, which makes the roughness of the machined surface small. Therefore, it can be used for large cutting amount, high productivity and wide application.

End milling cutter is the most commonly used type of milling cutter in CNC milling. Its structure, the cutting edge on the cylindrical surface is the main cutting edge, and the side cutting edge is distributed on the end face. Since there is no cutting edge at the center of the end face of the ordinary end milling cutter, the end face blade can not be used as an axial feed.

In order to improve chip curl, increase chip space and prevent chip blockage, the number of cutter teeth is relatively small, and the arc radius of chip groove is larger. Generally, the tooth number of the end milling cutter with coarse teeth is Z=3~4, the tooth number of end milling cutter with fine teeth is Z=5~8, the sleeve structure is Z=10~20, and the arc radius of chip groove is r=2~5mm. When the diameter of the end milling cutter is large, the structure of unequal tooth spacing can be made to enhance the anti-vibration and make the cutting process smooth.

Smaller diameter end mill cutter, generally made with a handle form. The end milling cutter of fig.2 ~ fig.71mm is straight shank; The end milling cutter of fig.6 ~ 63mm is mohs push handle; The end milling cutter of 25~80mm is 7:24 taper shank with screw holes, which are used to tighten the cutter. The end milling cutter with a diameter of 40mm ~ 160mm is capable of complete structure.

The end mill is mainly used to process grooves, step surface and forming surface by moulding. In addition, there are big spiral Angle end milling cutter with coarse teeth, corn milling cutter, carbide corrugated end milling cutter and so on.

The milling cutter with three face edges can be divided into straight teeth and staggered teeth. It is mainly used in horizontal milling machine processing step surface and one end or two through the shallow groove. In addition to the main cutting edge on the circumference of the milling cutter, there are also auxiliary cutting edge on both sides, which improves the cutting condition, improves the cutting efficiency and reduces the surface roughness. However, the width and size change greatly after regrinding.

Saw blade milling cutter is as follows, saw blade milling cutter itself is very thin, only has cutter teeth on the circumference, for cutting workpiece and milling narrow groove. In order to avoid the clipper, its thickness from the edge to the center to thin, so that the two sides form a secondary Angle.

Keyway milling cutter. Its shape is similar to that of an end mill cutter, except that it has only two spiral cutter teeth on the circumference, and the blade of its end cutter teeth extends to the center, both like an end mill and like a drill. Therefore, when milling the keyway with different ends, you can make a proper amount of axial feed. It is mainly used to process round head closed keyway, when it is used to process, it needs to do many vertical feed and vertical feed to complete keyway processing.