DE3730249A1 - Method and device for lapping bevel gears - Google Patents

Abstract

A method of lapping bevel gears is proposed, based on the known fundamental principle of lapping, according to which only stock is removed where two surfaces move relative to one another under pressure. In the lapping principle used up to now, the tooth flanks distorted to a varying extent during hardening are acted upon uniformly by the peripheral force. The stock removal is uniform. The proposed lapping method is intended to lap the tooth flanks affected by hardness distortion with increased pressure and thus permit partial stock removal. <IMAGE>

Description

The invention relates to a method for lapping cones wheels according to the preamble of claim 1 and a Device on which the method can be carried out.

It is known to use bevel gears to improve the upper surface quality, smoothness and transferability to lap. This machining process takes place after the Heat treatment. The material removal is very high low, so that larger gearing errors do not compensate can be. The lapping is as a finishing not suitable for inaccurate preprocessing improve, d. that is, warped flanks even during hardening cannot be made useful by lapping.

The object of the invention is to at least overcome this disadvantage partially eliminated by a process and a Carrying out this method suitable device that or the one - at least within certain limits - Allows improvement of poor pre-toothing.

This problem is solved with a method according to the Claim 1 and a device according to the patent saying 2.

The invention is based on the basic principle of lapping, according to which material is only removed where there are two Move surfaces under pressure relative to each other. When be Known lapping processes are also used in different ways tooth flanks drawn evenly by the circumferential force acted upon. The material removal is therefore the same moderate. In the lapping process according to the invention  those tooth flanks or parts thereof which, for. B. from a positive delay in hardness (excess compared to the target shape) lapped with increased pressure, which enables partial material removal. Other on the one hand, tooth flanks or parts of them, which B. from negative hardness delay (undersize compared to the target shape) lapped with reduced pressure, which allows less or no material removal light.

The invention is based on a in the drawing tion described embodiment. It shows

Fig. 1 is a schematic diagram of the processing Vorrich according to the invention,

Fig. 2 shows a section of a bevel gear.

In a machine frame 1 (not shown ) or in a slide or the like guided therein, a drive shaft or first spindle 2 for the interchangeable reception of a first bevel gear (pinion 3 ) is rotatably mounted, which can be driven by a motor ( 4 ). In the machine frame ( 1 ) or in another slide or the like. A brake shaft or second spindle ( 12 ) for the interchangeable mounting of a second bevel gear (ring gear 13 ) is rotatably mounted, which can be braked by means of a brake ( 14 ). The arrangement of the spindles ( 2, 12 ) is such that the two bevel gears ( 3, 13 ) can be brought into mesh with each other. A lapping means ( 11 ) can be brought into the intermeshing toothing by means of a device not shown in detail.

The end of the spindle ( 2 ) emerging on the side of the motor ( 4 ) facing away from the pinion ( 3 ) is connected via a releasable coupling ( 5 ) to an angle encoder ( 6 ). Similarly, the ring gear ( 13 ) facing away from the end of the spindle ( 12 ) via a releasable coupling ( 15 ) with an angle encoder ( 16 ) connected. Both angle step transmitters ( 6, 16 ) are connected via lines ( 7, 17 ) to an NC controller ( 8 ) which in turn influences a control device ( 9 ) which actuates the brake ( 14 ). The control device ( 9 ) can, for. B. be a servo valve or a pulse hydraulic device or the like.

The operation of the device is as follows. When the brake ( 14 ) is lightly applied, the motor ( 4 ) drives the pinion ( 3 ), which in turn drives the ring gear ( 13 ). The two angle step transmitters ( 6, 16 ) report to the controller ( 8 ) those places where - e.g. B. caused by a delay in hardness - show irregularities in the meshing. The same process is carried out with the opposite direction of rotation. Depending on the direction of rotation (clockwise or counter-clockwise), any pre or post-run error detected is saved with the size, direction of rotation and position in the control ( 8 ). Then the lapping process takes place in a manner known per se and in both directions of rotation, but not with constant pressure between the tooth flanks of the bevel gears ( 3, 13 ). Rather, the brake ( 4 ) is controlled by the control device ( 9 ), which receives corresponding pulses from the control ( 8 ) at the previously stored points and increases or decreases the brake pressure. For example, if a positive warpage on one tooth ( 20 ) ( Fig. 2) or on several teeth was found and saved, then as soon as this tooth comes into engagement, the pressure and thus the lapping effect are increased, so that more is produced on the right flank Material ( 22 ) is removed as on the adjacent tooth ( 21 ). In the opposite direction of rotation, however, less material is removed from the left flank of the tooth ( 20 ) than from the tooth ( 21 ) or none at all, since there is no excess due to the distortion. ( Fig. 2 is only to be understood as an illustrative example, because in practice such a different delay in adjacent teeth is extremely rare).

The couplings ( 5, 15 ) can be released during the lapping process. In many cases, however, it is desirable to have the couplings switched on and to let the measuring system ( 6, 16, 8 ) run when lapping. Then the lapping process can be observed and terminated as soon as the currently determined deviations from the target shape have reached a predetermined tolerance limit.

List of terms

1 machine frame
2 first spindle
3 bevel gear (pinion)
4 engine
5 clutch
6 angle encoder
7 line
8 control
9 control device
10th
11 lapping agents
12 second spindle
13 bevel gear (ring gear)
14 brake
15 clutch
16 angle encoder
17 line
18th
19th
20 tooth
21 tooth
22 material

Claims (2)

1. A method for lapping bevel gears, in which two bevel gears (pinion and ring gear), one of which can be driven in rotation and the other can be braked, are in rotating tooth engagement with one another, an abrasive being brought between the tooth flanks in contact with one another, characterized in that is that the braking action as a function of size and frequency of a measured at the two bevel gears engaging flanks error increases or decreases. 2. Device for lapping bevel gears after Ver drive according to claim 1, with two in one frame mounted spindles, one of which is drivable is and which receives a bevel gear (pinion) and the the other can be braked and the other bevel gear (plate rad), characterized by an angle pacemaker on each spindle with a control tion are connected via a control device depending on size and frequency of ongoing engagement flanks measured as rotational nonuniformity errors on the brake of one spindle.