Keyway milling cutter

What is a keyway milling cutter?


The keyway milling cutter is a kind of milling tool. The limit error of the blade diameter is divided into two types: e8 and d8. Keyway milling cutters have a small helix angle (20 degrees), groove depth, and approximately straight-line foldbacks. Keyway milling cutters are somewhat similar to twist drills.
Its appearance is similar to that of an end mill, but the difference is that it has only two spiral cutters on the circumference, and the cutting edge of its end cutter teeth extends to the centre, like both an end mill and a drill. Therefore, when milling a keyway that is blocked at both ends, an appropriate amount of axial feed can be made. It is mainly used for processing round-head closed keyways. When using it for processing, multiple vertical and longitudinal feeds are required to complete the keyway processing.

The keyway milling cutter has two blades, which can feed the hole axially into the blank, and then mill out the entire length of the keyway along the direction of the keyway. When resharpening, only sharpen the end edge. Small helix angle (20 degrees), deep groove, approximately straight-line fold back, somewhat similar to twist drill. The two-tooth end mill has a large helix angle, generally more than 30 degrees, and its appearance is the same as that of an ordinary end mill. Two-tooth end mills are usually used for rough machining of non-ferrous metals and low-carbon steel. The large helix angle and large chip flute make cutting light and smooth chip removal. A keyway milling cutter can process flat keyways, semicircular keyway surfaces, etc.


Common types of keyway milling cutters


According to different process methods, it can be divided into:


(1) Straight edge ball end milling cutter


(2) Taper shank keyway milling cutter


(3) Straight shank keyway milling cutter


(4) Half-round keyway milling cutter


Keyway milling cutter structure


The selection of the geometric angle of the keyway milling cutter is based on the workpiece material. Generally, the rake angle of the high-speed steel milling cutter is larger than that of the carbide milling cutter; the impact of the carbide end milling cutter is large during cutting, so the rake angle should be Small or negative value; When the carbide milling cutter adopts a positive rake angle, a negative chamfer should be added (the width should be less than the feed per tooth) to strengthen the cutting edge.


The difference between a keyway milling cutter and an end milling cutter


1) Different applications


The vertical milling cutter is used to process flat or cylindrical surfaces, and its outer diameter is relatively loose, while the keyway milling cutter is used to process keyways, and its outer diameter directly affects the quality of the keyway and the matching between keyways. For example, a 6MM end mill can mill slots faster than a 6MM keyway mill. The end mill is prone to breakage, while the keyway milling cutter can pass through it in one pass.

2) Different number of teeth


End mills typically have three or more teeth, and keyway mills typically have two teeth.


3) Differences in edges


In order to improve work efficiency, end mills have multiple allowances. The larger the diameter, the greater the allowance. The keyway milling cutter has two allowances, which mainly feed axially like a drill.


4) Different axial directions


The end mill cannot enter the tool axially, but the keyway milling cutter needs to move axially and move the tool axially at the same time. It can enter the tool axially, which is equivalent to a drill bit and can drill flat-bottomed holes.


5) The cutting volume of the keyway milling cutter is larger than that of the end milling cutter

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