What is a keyway cutter?

What is a keyway milling cutter?


Keyway milling cutter


The keyway milling cutter is a kind of milling tool, and the edge diameter limit error is divided into two types: e8 and d8. The keyway milling cutter has a small helix angle (20 degrees), the groove is depth, the approximate straight line folding back, and the keyway milling cutter and the twist drill are somewhat similar.

The shape of the keyway milling cutter is similar to that of an end mill, except that it has only two helical teeth on the circumference, and the cutting edge of the end face cutter extends to the centre, which is both like an end mill and a drill. Therefore, an appropriate amount of axial feed can be made when milling keyways that are blocked at both ends. It is mainly used to process the closed keyway of the round head. When using it to process, it needs to do multiple vertical feeds and longitudinal feeds to complete the keyway processing.

The keyway milling cutter has two blades, which can be fed axially to turn the hole into the blank, and then mill out the full length of the keyway along the direction of the keyway. When resharpening, only the end edge is sharpened. Small helix angle (20 degrees), deep groove, approximate straight line folding 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 the cutting light and smooth, and the chip removal is smooth. The keyway milling cutter can process flat keyway, semicircular keyway surface, 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 key slot milling cutter


Keyway milling cutter structure


The choice of the geometric angle of the keyway milling cutter depends on the material of the workpiece. 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 when cutting, and the rake angle should be Small value or negative value; when the carbide milling cutter adopts positive rake angle, negative chamfering 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 degree between the keyways. For example, a 6MM end mill is more likely to break than a 6MM keyway milling cutter for slot milling. The end mill is easy to break, but the keyway milling cutter can pass through it in one pass.

2) The number of teeth is different


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


3) Differences at the edges


In order to improve work efficiency, the end mill has multiple allowances, the diameter is larger, and the allowance is generally more, and the keyway milling cutter has two allowances, which are mainly fed axially like a drill.


4) The axial direction is different


The end mill cannot enter the tool axially, but the keyway milling cutter needs to move axially and at the same time move the tool axially, and 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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