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Get to Know the Classification of CNC Milling Bits!

In recent years, with the continuous development of the machining industry, new processes, technologies, and materials have emerged, and CNC tools themselves have made great progress. High-performance tool materials and more advanced tool structures continue to emerge. CNC tool manufacturers are constantly upgrading their products according to the needs of tool users.

Now let's take a look at some related knowledge about CNC milling bits.

A milling cutter is a rotating tool with one or more cutting teeth used for milling. When working, each tooth intermittently cuts away the excess material of the workpiece. Milling cutters are mainly used for milling flat surfaces, steps, grooves, forming surfaces, and cutting workpieces.

Classification of CNC milling bits by function

Cylindrical milling cutter

Used for milling flat surfaces on horizontal milling machines. The teeth are distributed on the circumference of the milling cutter. CNC milling bits are classified into straight teeth and spiral teeth according to their tooth shape, and into sparse teeth and dense teeth according to their number of teeth. The number of teeth of spiral teeth and sparse teeth milling cutters is small, and their tooth strength is high, with a larger chip space, suitable for rough machining; while dense teeth milling cutters are suitable for finishing.

Face milling cutter

Used for milling flat surfaces, end faces, and grooves on vertical milling machines, horizontal milling machines, or gantry milling machines. There are teeth on the end face and circumference of the face milling cutter. The face milling cutter also has coarse teeth and fine teeth. Its structure has three types: integral type, inlaid teeth type, and replaceable type.

End milling cutter

Used for milling grooves and stepped surfaces, with teeth on the circumference and end face. Usually, the end milling cutter cannot be fed axially during work. When the end milling cutter has a through-center tooth, it can be fed axially.

Three-edge milling cutter

Used for milling various grooves and stepped surfaces, with teeth on both side faces and circumference.

Angle milling cutter

Used for milling grooves at a certain angle, including single-angle milling cutters and double-angle milling cutters.

Saw blade milling cutter

Used for machining deep grooves and cutting workpieces, with many teeth on the circumference. To reduce friction during milling, there is a 15′~1° secondary relief angle on both sides of the teeth.

Die milling cutter

Used for machining mold cavities or convex mold forming surfaces. The die milling cutter is evolved from the end milling cutter. According to the shape of the working part, it can be divided into three types: conical flat head, cylindrical ball head, and conical ball head. Cemented carbide die milling cutters are widely used. In addition to milling various mold cavities, they can also replace hand files and grinding heads to remove burrs from castings, forgings, and welded workpieces, and to polish certain forming surfaces. This CNC milling bit can be used on manual or electric tools. Its productivity and service life are tens of times higher than those of grinding wheels and files.

Gear milling cutter

A cutting tool for cutting teeth according to the profile method or the enveloping method without instantaneous center. According to the different shapes, it is divided into disc gear milling cutters and shank gear milling cutters.

Thread milling cutter

A milling tool for milling threads by three or more axes combined machining centers.

In addition, there are keyway milling cutters, dovetail milling cutters, T-slot milling cutters, and various forming milling cutters.

Classification of CNC milling bits by product structure

Integral type

The tool body and cutting teeth are made in one piece.

Integral welding type

The cutting teeth are made of cemented carbide or other wear-resistant tool materials and brazed on the tool body.

Inlaid teeth type

The cutting teeth are clamped on the tool body by mechanical means. This replaceable cutting teeth can be either an integral tool material or a welded tool material. The milling cutter with the cutting teeth sharpened on the tool body is called an in-situ sharpening milling cutter. The milling cutter with the cutting teeth sharpened separately on the fixture is called an ex-situ sharpening milling cutter.

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