SU969397A1 - Apparatus for hobbing gears - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used for the hot rolling of wheel teeth. ;

A device is known for rolling up dalindrical gears by setting the workpiece at a constant center-to-center distance between the drive gear rolls and the workpiece 1.

The drawback of this device is that it does not provide the required accuracy of the rolled gear.

The easiest to offer is a device. For rolling gear teeth, there is a drive gear roll, kinematically associated gear punches, on the working surfaces of which are arranged wedges, and a centralizer mounted on one of the punches with the ability to interact with the centering socket another punch 2.

The disadvantages of the known device are the low accuracy of the rolled gear wheels, as well as the difficult removal from the centralizer of the rolled wheel.

The purpose of the invention is to improve rolling accuracy and productivity.

The goal is achieved by the fact that the device for rolling gears, containing a driven toothed roller, kinematically associated toothed punches, on which working surfaces new protrusions are located, and a centralizer mounted on one of the punches with the possibility of interacting with the centering the nest of the other punch, provided with stops, and the punch with the centralizer is mounted with the possibility of axial movement Up the stops, and the centralizer is made in the form of a conical, self-aligning cylindrical stew.

20

The drawing shows a diagram of the device.

The gear rolling device consists of a gear roll 1, which is

25 an exact corrected gear with a module equal to the module overrun & gears, the upper composite punch of the hub 2 with a movable gear 3, having

30 a form corresponding to the shape of the rolling gear, and being,

; as well as the lower punch 4, in direct kinematic connection with the roller 1. In the same plane with the roller 1 and the punches 2 and 4 on the moving axis there is a calibrated gear roller 5, which interacts with the punches and assembly to move in the radial direction to the center of the workpiece the account of the radial clearance increased by (0.05-0.10) hectares in the engagement of the punches is a roller, where m is the module of the driven gear. The hydraulic cylinder b is designed to create the necessary pressing force; neither by the upper punch 2. The adjustable stops 7 interact with the sliding toothed rim 3 of the upper; punch. At the ends of the punches 2 and 4 are installed removable protrusions 8, having in cross section the shape of an asymmetrical wedge. At the same time, they can be annular (for knurling fine-modular wheels) and sector-wise for each tooth (when knurling coarse-module 5 1 UM wheels). The centralizer 9 has a directional K) conic and cylindrical portion for calibrating the base central opening of the workpiece and preventing it from rolling. This provides an accurate basis for the subsequent machining of the ring gear, which simplifies the process and improves the accuracy of the rolled profiles.

The process of rolling the teeth of the wheels proceeds as follows.

Billet in heated HDTV condition. The scientific research institute is located on the supporting end of the punch 4. The punch 2, moving down, the centralizer 9 fixes the workpiece in the central position and, continuing to move down, begins to deform it, to upset. At the same time, roller 1, punches 2 and 4 and roller 5 are rotated. , from o & tfero main drive.

With an increase in the diameter of the workpiece due to precipitation, it begins to deform by the roll teeth. The resulting torque is sensed by the synchronous transfer punch - swath, which ensures the correct formation of the teeth of the wheel. The role of the protrusions 8 in this case consists in the reliable fixation of the workpiece in the rolling apparatus and in ensuring a better filling of the end sections of the rolled teeth with metal. When used as a workpiece of worn gears, the protrusions play a major role in the shaping process — the teeth, since they displace the metal from the ends of the worn wheel into the gear ring, compensating for the wear of the teeth. The knurling process is completed by filling the metal with a closed caliber formed by the surface workers. mi teeth roll and the ends of the punches. .

To improve the accuracy of the wheels with the Rolled rim, a sizing roller 5, which has a separate mechanical lead, is engaged. After the teeth are calibrated, the roller is retracted to the initial position, and the punch 2 with the knurled wheel rises up due to which the puller is actuated, the finished wheel collides with the center-bar downwards and is moved out of the device.

Compared with the prototypes, the proposed device, the gear wheel rolling, allows to increase the accuracy of rolling and expand the technological capabilities of the device.

Claims (2)

1. The patent of Germany. 916824, cl. 7 f 5/02, 1960. 2. Authors certificate of the USSR 314586, cl. B 21 N 5/02, 02.08.68 (prototype).