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There are many narrow grooves on the tooth surface to form the cutting edge, and the gear-shaped gear machining tool is used to machine the workpiece according to the principle of helical gear meshing. During processing, the tool cuts beard-like fine chips from the tooth surface of the gear, so it is called a gear shaving cutter. Gear shaving cutters are used for finishing gear teeth after gear hobbing and gear shaping (see gear processing). The commonly used disc-shaped gear shaving cutter is like a hardened helical cylindrical gear (Figure 1). The groove on the tooth surface has two forms: one is that a circular or spiral pass is opened on the entire gear ring. The cross section of the groove can be rectangular or trapezoidal. This shaving cutter only sharpens the front face (groove) after being blunt. It is suitable for shaving cutters with modulus less than 1.75 mm; the other is that the grooves on both sides are impassable, which are inserted separately with comb-shaped inserts. In order to make the inserts can withdraw the knife, it is placed at the root of each tooth. Drill slanted holes. After this kind of shaving cutter is blunt, it needs to regrind the tooth profile and the cylindrical surface of the tooth top. Shaving knife
In order to reduce the cutting load of each tooth, the number of teeth of the gear shaving cutter is large, and the prime number is generally used to avoid a common factor with the number of teeth of the gear to be cut, otherwise the error of the gear shaving cutter will be copied to the gear to be processed. According to international standards, the precision of gear shaving cutters has three types: AA, A and B. In actual production, the gear tooth profile shaving with the correct involute tooth profile shaving cutter often deviates from the correct involute line near the pitch circle of the gear, and is recessed inward, with a deviation of about 0.01 to 0.03 mm. The tooth profile deviation of spur gears is larger than that of helical gears. In order to get the correct involute tooth profile of the workpiece, the tooth profile of the shaving cutter should be corrected. In mass production, the tooth profile correction curve of the shaving cutter is determined by experimental methods.
The gear shaving cutter can process straight and helical inner and outer cylindrical gears, with high production efficiency and smooth surface. In addition, there are also worm gear shaving cutters for processing precision worm gears. The type and parameters of the basic worm gear should be the same as the working worm gear matched to the worm gear. Like the gear shaving cutter, it has many narrow grooves on the spiral surface to form the cutting edge and contain the chips. Worm gear shaving cutters are difficult to manufacture and are only used when machining worm gears that require high precision.