Difference Between Keyway Milling Cutter And End Milling Cutter
Generally, keyway milling cutter has only two cutter teeth, and the blade of its end cutter teeth extends to the center, which is like both flat end milling cutter and drill bit. The keyway milling cutter has two edge lobes, which can feed axially to the blank hole, and then mill the full length of the keyway along the keyway direction. Only the end edge is grinded during regrinding.
Small helix angle (20 degrees) groove depth, approximate straight line, folding back is a little similar to twist drill. The helix angle of two tooth end milling cutter is large, generally more than 30 degrees, and the appearance is the same as that of ordinary end milling cutter. Two tooth end milling cutter is usually used for rough machining of non-ferrous metals and low carbon steel. Large spiral angle and large chip holding groove make the cutting light and smooth chip removal.
characteristic
1. In order to reduce the influence of radial cutting force, the cutter teeth are designed into two symmetrical cutter teeth, so that the radial forces of the two cutter teeth offset each other during operation, so the keyway with the same width as the cutter rotation diameter can be processed at one time.
2. The main cutting edge of keyway milling cutter is on the cylindrical surface, and the cutting edge on the end face is the auxiliary cutting edge. When working, it is not allowed to feed along the axial direction of the milling cutter.
3. The cutting amount of keyway milling cutter is larger than that of flat end milling cutter.
4. The outer diameter dimension is relatively precise, because the dimension requirements of the keyway after machining are relatively high, so that the key will not loosen after matching.
Purpose and classification
The end face of the keyway milling cutter has no central hole and can feed directly downward. It is equivalent to a drill bit and can drill a flat bottom hole. It is usually mainly processed in the groove and keyway.
Keyway milling cutter is also divided into taper shank keyway milling cutter, straight shank keyway milling cutter and semicircular keyway milling cutter. Among them, taper shank keyway milling cutter and straight shank keyway milling cutter are used for milling flat keyway, and semicircular keyway milling cutter is used for milling semicircular keyway.
Geometric parameters of keyway milling cutter
The geometric angle of keyway milling cutter is selected according to the workpiece material. Generally, the rake angle of high-speed steel milling cutter is larger than that of cemented carbide milling cutter; When cutting with carbide end milling cutter, the impact is large, and the rake angle should be small or negative; When positive rake angle is adopted for carbide milling cutter, negative chamfering (width shall be less than feed per tooth) shall be added to enhance the cutting edge.
Negative chamfering refers to the chamfering with a front angle of about - 15 ° and a width of about 0.1 ~ 0.2 on the common flat blade. In the case of chip rolling groove, the negative chamfering increases the wedge angle of the tool, enhances the strength of the blade, expands the heat dissipation area and increases the deformation of the chip. It is of great significance to improve the durability of the tool and the smooth rolling out of the chip.
Difference between keyway milling cutter and end milling cutter
1. Keyway milling cutter cannot process plane, while end milling cutter can process plane.
2. The keyway milling cutter is mainly used to process keyways and grooves. The keyway milling cutter is very good for milling keyways. For example, 6mm end milling cutter and 6mm keyway milling cutter are easier to break than slot milling, while keyway milling cutter can pass through at one time.
3. The cutting amount of keyway milling cutter is larger than that of end milling cutter.
