There are two forms of grooves on the tooth surface of the triangular spline gear shaper cutter. One is that a circular or spiral through groove is opened on the whole gear ring, and the cross section of the groove can be rectangular or trapezoidal. After being blunt, this gear shaving cutter only sharpens the front, and the tooth shape and outer diameter do not change. Because the through groove cannot be too deep, the other is that the grooves on both sides are blocked, In order to enable the inserting knife to withdraw the knife, an inclined small hole is drilled at the tooth root of each tooth. After the shaving cutter is blunt, the tooth profile and the cylindrical surface of the tooth top need to be reground.
In order to reduce the cutting load of each tooth, the number of teeth of the shaving cutter is large, and the prime number is generally taken to avoid having a common factor with the number of teeth of the gear to be cut. Otherwise, the error of the shaving cutter will be copied to the gear to be machined. The accuracy of the triangular spline gear shaper cutter can be divided into Grade AA, Grade A and grade B according to the international standard. In actual production, The gear profile shaved by the shaving cutter with the correct involute profile often deviates from the correct involute near the pitch circle of the gear and is concave inward, with a deviation of about 0.01-0.03mm. The tooth profile deviation of spur gear is larger than that of helical gear. 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 method.
When the tooth top of the gear shaper cutter cuts into the involute tooth profile at the root of the gear to be cut in the cutting process, it is called undercutting. The less the number of teeth of the gear to be machined, the greater the possibility of undercutting. Limitation of interference of gear transition curve: when the gear shaper cutter is cutting teeth, it cannot cut the involute tooth profile on the whole tooth surface, and there is a transition curve at the root of the gear. The less the number of teeth of the gear shaper cutter and the greater the tooth deformation coefficient, the longer the transition curve. If the tooth top of the paired gear contacts with the transition curve, interference will occur. Top cutting refers to the phenomenon that the tooth top of the gear to be cut enters the tooth profile of the root of the gear shaper cutter and is cut off. The smaller the number of teeth and displacement coefficient of the gear shaper cutter, the easier it is to produce top cutting. For the gear shaper cutter for machining internal gears, the restriction that the gear shaper cutter does not have top cutting in the radial cutting process should also be considered.
In order to reduce the cutting load of each tooth, the number of teeth of the shaving cutter is large, and the prime number is generally taken to avoid having a common factor with the number of teeth of the gear to be cut. Otherwise, the error of the shaving cutter will be copied to the gear to be machined. The accuracy of the triangular spline gear shaper cutter can be divided into Grade AA, Grade A and grade B according to the international standard. In actual production, The gear profile shaved by the shaving cutter with the correct involute profile often deviates from the correct involute near the pitch circle of the gear and is concave inward, with a deviation of about 0.01-0.03mm. The tooth profile deviation of spur gear is larger than that of helical gear. 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 method.
When the tooth top of the gear shaper cutter cuts into the involute tooth profile at the root of the gear to be cut in the cutting process, it is called undercutting. The less the number of teeth of the gear to be machined, the greater the possibility of undercutting. Limitation of interference of gear transition curve: when the gear shaper cutter is cutting teeth, it cannot cut the involute tooth profile on the whole tooth surface, and there is a transition curve at the root of the gear. The less the number of teeth of the gear shaper cutter and the greater the tooth deformation coefficient, the longer the transition curve. If the tooth top of the paired gear contacts with the transition curve, interference will occur. Top cutting refers to the phenomenon that the tooth top of the gear to be cut enters the tooth profile of the root of the gear shaper cutter and is cut off. The smaller the number of teeth and displacement coefficient of the gear shaper cutter, the easier it is to produce top cutting. For the gear shaper cutter for machining internal gears, the restriction that the gear shaper cutter does not have top cutting in the radial cutting process should also be considered.
