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Fan Chengfa uses a pair of gears to mesh with each other, and the two wheels are enveloped with each other to machine the gears. Gear hobs (ie, involute worm hobs) are the most commonly used tools for machining externally meshed spur and helical gears. It is equivalent to a helical gear with a large helix angle. Because the axial section of the hob is a rack shape, when the hob and the wheel blank respectively rotate around their own axes, they are equivalent to the rack gear in the rotary surface of the wheel blank. Engagement drive, the hob also makes a feed motion along the axis of the wheel blank, so that the gear teeth of the entire gear are cut out to process the standard spur gear in the radial feed direction, when the tool center line NN is tangent to the index circle of the wheel blank That is, the tool center line coincides with the tool pitch line, so that the processed gear is a standard spur gear. At this time, the gear indexing circle has a tooth thickness, a tooth groove width, and a circumferential joint equal to the tooth thickness, the tooth gap width, and the circumference of the tool center line.
Into the hob center line spiral angle of rise d. hob center line diameter Pn = nditg into. cosA=ndi.sin is cut into the gear division circle Pn =P wheel blank: ancient: 丌m=nd.sin into the 艮When the worm hob installation angle satisfies the above formula, the standard involute can be cut Spur gears with line profiles.
3 machining displacement spur gear 3.1 machining positive spur gear, in the radial direction, the tool center line is no longer tangent to the wheel's indexing circle, should be away from the wheel blank center a certain amount of displacement X = xm, At this time, the circumference is not on the tool center line, but the standard helical gear is processed in the pitch line: =L (take c = 1). The machining displacement is inclined: when the spur spur gear is machined by the worm hob, the roller is rolled. The tool mounting angle is adjusted to: When the cylindrical gear is used, different values ​​should be taken according to different C.
From the formula of the installation angle of the spur gear hob for machining positive and negative displacement, the installation angle also changes with the change of xm. If A is used instead of A. to process the spur gear, it will affect the gear. Some of the geometry is because A is used instead of Ac, so there is "such that the direction of the tooth of the tool at the indexing circle is deviated from the direction of the tooth groove of the workpiece, resulting in a tooth thickness error.
And the tool moves away from the wheel blank by xm, and the machined gear is a positive displacement spur gear with a variable of xm.
32 machining negative spur gear tool center moves closer to the center of the wheel blank with a certain amount of displacement X = xm, then the pitch radius ri = ri - xm, where the corresponding helix angle is Ac2 thick.
5.2 The amount of change in the hob mounting angle also affects the tooth profile error. This also affects the accuracy of the tooth profile and causes changes in the circumference and transition curve.
The relationship between the difference between 5.3A and Ac and X increases with increasing X.
As X increases, /i increases.
When the worm hob is radially close to xm toward the center of the wheel blank and the hob mounting angle is adjusted to arcsiM), the gear that is machined is the negative straightening tooth- 2 column gear.
4 machining helical helical gears bookmark7 helical gears to adjust the hob teeth to the direction of the workpiece spiral groove, and consider the workpiece helix angle å©; hob installation angle: Y = Ac but (: 2000 - there are some carbon steel pipe The road is "replaced" because there are some stainless steel pipes in the device. "2 2MoVA in Table 1 is changed to CMoA"