RU1773658C - Device for restoring gear wheels - Google Patents

Abstract

Usage: in mechanical engineering. SUMMARY OF THE INVENTION: the device comprises a profile roll with profile protrusions on the outer surface mounted on supports rotatably relative to the longitudinal axis and radial movement, a rolling roll mounted rotatably relative to the longitudinal axis, a gear gauge, a clamp. Profile and rolling rolls are installed with eccentricity relative to their rotational axes. The profile roll can be made in the form of a cam with several profile lifts on the working surface and is connected to the kinematic chain by a run-in sleeve. 1 C.p. f-ls, 2 ip.

Description

The invention relates to mechanical engineering, in particular to the field of metal forming, and can be applied in repair plants for the restoration of gears,

Known devices for restoring the internal teeth of gears, containing a profile roll mounted on bearings with the possibility of radial movement and made in the form of the outer groove of the restored wheel, an additional roll and lateral limiting elements (ed. St. N: 774738, CL 21 21 5 / 05, N 1055579.cl. B 21 H 5/02).

Also known are devices for restoring the outer rim of gear wheels, comprising a gear knurl, consisting of a shaping and synchronizing rims with working tooth profiles corresponding to the profiles of the machined and non-machined crowns, and a workpiece clamping mechanism (ed. St. No. 444595, class B 21 H5 / 00),

A disadvantage of the known devices is the increased radial forces for restoring the gear rim of the workpieces, significantly high torques arising in the process of gear restoration.

The aim of the invention is to increase the productivity and quality of restored gears by creating a device design that provides a radial load distribution according to a sinusoidal law, which allows to reduce radial forces while maintaining a radial load on the restored gear.

This goal is achieved by the fact that the profile roll mounted on the bearings with the possibility of rotation about the longitudinal axis and radial movement, made with professional projections on the outer surface, the rolling cage installed with the possibility of rotation about the longitudinal axis, are installed with an eccentricity relative to its axles rotated VI XI

With

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neither. The value of the eccentricity e can be taken (0.1-0.5) t, where t is the modulus of the gear being restored, mm, as well as the fact that the profile roll is made in the form of a cam with several profile lifts on the working surface and is connected with rolling roll kinematic chain.

Figure 1 shows a device for restoring gears with offset axles, a general view; figure 2 - profile roller cam having three lifts,

The device consists of a profile roll 2 installed with an offset on the support 1, which is necessary for extruding metal from the ends of the heated part 3 into the wear zone of the teeth, gear gauge 4, necessary for forming the gear profile, with a side flange and an internal cavity for cooling, rolling roll 6, offset by the same amount as the profile roller, clamp 5 (figure 1). Liquid is supplied into the internal cavity of caliber 4 through the clamp 5 to cool the system. The outer diameter of the restored wheel is formed by means of a rolling roller 6. The profile roller 2, as well as the roller 6, are mounted relative to their axis of rotation with some eccentricity e (0.1-0.5) m (Fig. 1). The rolling rolls 2 and b and the restored wheel 3 are interconnected by a kinematic chain.

A variant is possible in which the profile roll 2 is made in the form of a cam, the working surface of which has several profile lifts, for example 3 (figure 2). The profile roll cam 2 is connected to the rolling roll 6 by a kinematic chain so that the speed of rotation of the rolling roll is determined by the number of times the profile roll rises

In Pob.v.pr.v,

where Pob.v rotational speed of the rolling roll;

For example, the rotational speed of the profile roll;

and - the number of elevations of the profile roll.

The device operates as follows.

The gear 3 heated in the HDTV inductor to a temperature of plastic deformation (900-1000 ° C) is mounted on the gear surface of caliber 4, mounted, for example, in a lathe chuck. In this case, the caliber tooth enters the depressions of the inner teeth of the wheel,

Closed gauge for deformable metal. Wheel fastening is carried out by clamp 5 with side flange. When the mutual rotation of the roller 6, the profile roll 2 and

of the restored wheel 3 to the rollers 2 and 6, a radial feed is communicated. The installation of rolls 2 and 6 with an eccentricity relative to its rotational axes ensures the creation of a radial load according to a sinusoidal law. Under the influence of such a radial load on the gear wheel 3, heated up to the temperature of plastic deformation, volume compression of the workpiece occurs, which, in turn, leads to a plastic flow of metal from the ends of the gear toward the worn parts of the gear rim. The final formation and calibration of the ring gear is carried out without radial feeding of the rolls 2 and 6, due to the residual stresses on the ring gear. To increase the accuracy of the restored gears, the number of revolutions of the wheel 3 should not be a multiple of the number of revolutions of the rolls 2 and 6; the magnitude of the eccentricities of the rolls 2 and 6 should be such that the equilibrium state of the restored wheel is ensured, i.e. its radial movement would be excluded.

The increase in performance during the restoration of gears is achieved due to the fact that during the idle period of the cam eccentric cam it is possible to increase the radial

filing of the profile roll in comparison with the prototype, since plastic deformation occurs only during the contact period of the working section of the profile roll, i.e. at regular intervals

During restoration by the proposed method, radial movement of the deformation rolls to a great depth is provided.

When the profile roll is made in the form of a cam, its lifting angle and profile can be calculated so that optimal deformation conditions are ensured, and the idling period is

reduced to a minimum. This provides not only an increase in productivity, but also an increase in specific pressures during deformation,

The increase in specific pressures during deformation of the restored gear wheel provides a better filling of the caliber with metal, which helps to improve the quality of the restored gears.

Claims (2)

Formula 1, A device for reconditioning gears, comprising a profile roll mounted on supports rotatably relative to a longitudinal axis and radially moved, formed with profile protrusions on an outer surface, a rolling roll mounted rotatably mounted on a longitudinal axis, a gear caliber and a clamp characterized in that, for the purpose of increase productivity and quality of the restored wheels, profile and the roll rollers are eccentric with respect to their rotational axes. 2. Device pop. 1, characterized in that the profile roll is made in the form of a cam with several profile lifts on the working surface and is connected to the rolling roll by a kinematic chain. FIG. 1 u / LJVJ - ,, 2