SU64190A1 - Method of grinding gear wheels on gear cutting unit - Google Patents

Description

Modern mechanical engineering places increased demands on the precision machining of gears. These requirements can only be satisfied by grinding the teeth of the hardened gears ..:, z4,; J;

There are several ways to grind gears. Grinding according to the method of copying with a disk abrasive, whose working profile corresponds to the profile of the cavities, is similar to the method of milling with a disk modular cutter. The latter, however, was supplanted by the method of rolling by the method of rolling with a worm mill, which turned out to be much more efficient and accurate. Somewhat later, machines for grinding gears were invented according to the run-in method with an abrasive screw. But an obstacle to the spread of this method was the difficulty of maintaining the accuracy of the worm profile; The main reason for the distortion of a worm profile is its uneven wear.

The purpose of the present invention is to achieve a uniform wear of the abrasive screw and thereby eliminate the above disadvantage, which impedes the introduction of the method in the industry. This is achieved

By grinding gears on a gear cutting machine by running them with an abrasive screw, the latter is periodically corrected in two directions: 1) the tops of the turns of the screw are right so that they are located on the globoid and 2) the sides of the iBHHTOBoro profile is worms ka is right diamonds, which are reported circular motion, independent of the rotation of the screw, and the translational, associated with the step of cutting.

The proposed method for grinding gears is carried out on a machine equipped with mechanisms for dressing in both themed directions.

In FIG. 1 illustrates the proposed method of working in terms of editing the tops of the turns of the screw along the globoid, FIG. 2, the proposed method is explained in terms of editing the lateral sides of a worm profile with bringing the kinematic scheme of mechanisms for carrying out the movement of a diamond, Fig. 3 shows a front view of the rate for carrying out the proposed method and FIG. 4 - side view of the machine.

According to the invention, uniform wear of the abrasive screw 1 (FIG. 1) can be achieved, its tips of its turns will be located in Globoid A. This requires a screw in the grinding process of the gear 4, which rotates around the axis of the mandrel 5, Edit diamond 24, the holder 23 of which receives oscillating movements around the axis 43, which is located parallel to the axis. Amendments 5 and perpendicular to the axis 2 of the spindle of the screw.

The second condition for achieving uniform wear of the screw, according to the invention, is the correction of the lateral sides of its profile with a diamond, which receives a circular motion, independent of the rotation of the screw, translational, cB zaynre with the step of cutting it.

For this, diamonds can be house stitched on the outer rim of the discs 31 (Fig. 2) 1st to let these discs rotate from individual motors. At the same time, the disks are communicated in translation in the direction parallel to the axis 2 of the screw, a movement kinematically connected with the cutting of the screw.

The design of the gear cutting machine in compliance with the above two conditions constituting the essence H1 of the proposed method is shown in FIG. 3 and 4.

The abrasive worm to 1 is rotated by the spindle 2, processing the gear. wheel 4, seated on mandrel 5. This mandrel is clamped at centers 6, 6 and receives rotation with the help of clamp 7 and the leash 8, rigidly fastened to the split gear 9, driven by a worm shaft 10 (Fig. 2 and 3). The latter receives rotation through the corresponding gear from the engine 3 (Fig. 2 and 4).

The spindle 2 (fig. 4) of the screw 1 is mounted in bearings of the ort 11, fixed on the sled 1.2; the caliper can be set to the required angle of inclination on a scale of 13 by a screw 14. The slide 12 has a translational movement along the racks of the rack 15.

Table 16. together with the workpiece 4 with the help of the screw 17 can move 1 s along the direction of

bed 18. With a table-16, a stand 20 is fastened on which the headstock 21 of the upper center 6 is located. Parallel to the axis of the workpiece 4 and perpendicular to the axis of the screw 1, a roller 43 is placed in the rack 20. This roller carries the holder fastened with it perpendicular to its axis 23 diamond 24. Roller 43 receives a swinging reciprocating motion from a gear placed, for example, in rack 20. In this case, the holder 23 is configured such that the mandrel does not prevent the grinding screw 1 from interfering with}. The right diamond 24 can be moved along the axis of the holding 23 with a graduated head 25.

On the grinding pan 11, at the top, there is a mechanism for dressing the sides of the profile of the sanding wheel. This mechanism can automatically move along cylindrical guides 26 and 27 along the axis of the grinding spindle 2 from a copywriter 28 (Fig. 3), which sits on the same axis as the filled abrasive worm. 1, with the aid of a half-nut 30 fixed in bracket 29. The governing disks 31 receive a self-rotation from the electric motors 33 by means of a belt drive.

Swivel calipers 34 mounted on the desired angle of the profile of an abrasive screw are fastened to the slide 35. The latter can be mutually shifted and moved apart by means of a screw 36, and together with a nut 37 can move together in one or the other direction along the carriage 38. The carriage 38 using a screw 39 and the mechanism 40 may be fed to the refill abrasive worm to I.

Grinding spindle 2, and with it, and. copier-worm to 28 get a slow reverse rotation when editing the abrasive worm from the electric motor 41 (Fig. 2). The drive of the right disks to the abrasive screw and. they are removed from it using the handle 42. (Fig. 3). Switching off the reciprocating bridging is achieved by uncoupling the nut, 30 from the cam-screw 28.

Subject invention

Claims (3)

1. The method of grinding gears on a gear cutting machine by running them abrasive — a worm, characterized in that the tops of the turns of the abrasive worm are straightened on the same machine, and the sides of the viit profile are straightened on the same machine reported by circular motion, independent of the rotation of the screw, and progressive, associated with the step of cutting it. 2. A machine for carrying out the method according to claim 1, characterized in that, in order to edit the apex of the turns of the abrasive screw 1 along the globoid, in the rack 20 of the table 16 carrying the workpiece is placed parallel to the axis of the workpiece and perpendicular to the axis of the screw 43, carrying the holder 22 of the diamond 24 perpendicular to its axis and receiving a reciprocating rotational movement. 3. A machine for carrying out the method according to claim 1, which is designed so that, in order to edit the sides of the abrasive worm profile, mobile spindles are used under the action of the worm screw 28 along the guides 26, 27 32, carrying disks 31 with fastened on the outer rim of the nuts, receiving rotation from individual engines 33.  64190 -, -JSLVJ J Z 2 S yG I ip rii