Adjustable rolling gear for different base circle diameters on a gear cutting machine for involute gear cutting

Description

[0001] Device for controlling the rolling process during the manufacture and machining of straight or helical gears with The invention relates to an involute gear. Further development of a device for controlling the rolling process during manufacturing and Machining the tooth flanks of spur or helical gears with involute teeth using an intermittent rolling process, with a The workpiece to be machined is rotatably mounted on a workpiece table for the execution of a rolling motion, which is connected to a workpiece slide. is translationally movable, wherein a push rod supplying the rotary component of the rolling motion is slidable on the workpiece slide is guided and via a backdrop stone is connected to a guide track that receives this and is rotatably arranged on the machine bed, and to a gear toothing generating tool, wherein either the tool or the workpiece additionally performs a periodic reciprocating stroke, according to patent application ... (patent application 1 20 O9 593.6).

[0002] According to the main patent, this device is designed such that the push rod is in a direction perpendicular to the translational movement It is guided so that it can slide on the workpiece carriage and carries the cam block at one end, thus being directly connected to it. However, it has been shown that, depending on the design of the grinding machine or the type of workpiece being machined, there is a risk that the The push rod, in one of its extreme positions, collided with the part of the machine frame on which the tool is located.

[0003] The object of the present invention is therefore to provide a device that eliminates this danger in all conceivable cases, so that There are no restrictions regarding the processing of different workpieces.

[0004] Starting from a device of the type described above, this problem is solved according to the invention by the fact that the push rod in a direction parallel to the transelatory movement on the workpiece slide, it can be moved and is connected to a second pulley block in a guide track of a lifting element that is movable perpendicular to the translational movement of the tool slide engages, which in turn is directly connected to the first kulinsen stalks.

[0005] The push rod can be designed as a rack that engages with a gear connected to the workpiece. j However, it is also possible that the two ends of two tension bands are attached to the push rod, the other ends of which are attached to a with are attached to the workpiece.

[0006] By means of the measures according to the invention, the distance between the 9th assembly table and the push member can be adjusted via the length of the push rod. It can easily be arranged so that any risk of collision between the thrust member and the naval propeller is eliminated. On the other hand, it is also possible to... Adjust the relative position of the thrust member on the workpiece slide so that none of the extreme positions of the thrust member pose the aforementioned risk of collision with brings itself.

[0007] It has proven advantageous that the guide track to the second cam block is opposite the push rod and the push member runs at an angle of 450.

[0008] The invention is explained below with reference to an embodiment shown in the drawing.

[0009] A gear 1 to be machined is fixedly mounted on a rotary table 2, which is rotatably mounted on a workpiece slide 3. The rotary table 2 carries a rolling arc 4, the diameter of which corresponds to the base circle diameter of the gear 1 to be manufactured.

[0010] On this roller arch 4, the two ends of two tension bands 5 are attached at opposite points, the other two ends of which with a push rod 24 are connected, which can be moved on the workpiece slide 3 in the translational direction of movement.

[0011] In the drawing it should be noted that the tension bands 5 together with the push rod 24 are actually located on the same side as the grinding wheel 10, so that the desired rolling process of the gear 1 can take place against the tool. The reversed The chosen format was selected for better clarity.

[0012] The push rod 24 engages with a sliding block 27 in a guide track 25 of a push member 26, which is mounted on the workpiece slide 3 is mounted in a way that allows it to be moved transversely to its translational movement.

[0013] The thrust member 26 is in turn bound to a guide track 20 via a guide stone 19 directly connected to it, which in the housing 21 which is fixedly arranged on the machine bed 6, it is rotatable so that its angular position relative to the workpiece slide can be continuously adjusted can be adjusted.

[0014] The translational displacement of the workpiece slide 3 can be carried out directly via a disengageable ball screw 7, which is driven by a motor 8 is driven via a feed gearbox 9. However, it is also possible to drive the push member 26 by means of a motor 23. to adjust via a ball screw 22, which can also be disengaged, whereby a [missing text] can also be [missing text] via the cam block 19 and the guide track 20. This results in a transient movement for the workpiece slide 3. In this case, it is advantageous to use the drive 7, 8, 9 as long as the The angle ranges from 0 to 450°. and to use the drive 22, 23 for angles of 45°. This ensures that there is no movement between cam block 19 and guide rail 20. Self-inhibition may occur.

[0015] The mode of operation of the described device is as follows: When a displacement of the ball screw 7 is generated by the ball screw In the workpiece slide 3, a relative movement occurs between the cam block 19 arranged on the push rod 26 and the stationary Guide track 20. Here, the cam follower 19 and thus also the lifting link 26 experience a change in position that depends on the angular position of the guide track 20. Lateral movement, which is transmitted via the guide track 25 and the cam block 27 to the push rod 24, thus resulting in a rotation. of the roller arc 4 and the gear 1. In the event that, for example, the base circle diameter of the gear 1 to be machined The diameter of the roller arch 4 must be exactly equal to the transverse movement of the thrust member 26 generated by the cam block 19. be as large as the displacement movement of the workpiece slide 3 generated by the ball screw 7, so that the gear 1 during the in The grinding wheel 10, which is engaged, performs the desired rolling motion exactly. To achieve this movement sequence, the Guideway 20 must be inclined at an angle of exactly 45° with respect to the movement direction of the workpiece slide 9. For machining For gears whose base circle diameter is larger or smaller than the diameter of the roller arc x 4, it is sufficient to adjust the angular position of the guide track. to set 20 to a mathematically predetermined value, so that in turn the involute gearing The necessary rolling motion of gear 1 is ensured.

[0016] If the base circle diameter of the gear to be machined is larger than the diameter of the roller arc 4, then the one attached to the Guide track 20, angles to be set less than 45°. It approaches the value s 0 with increasing gear diameter and is exactly " 0 at Grinding or machining a rack, because this no longer involves a rotary movement, but merely a translational movement of the Workpiece slide 3 is required.

[0017] If the base circle diameter of the gear to be machined is smaller than the diameter of the hollow arc 4, then the one attached to the Guide track 20 angles greater than 45° to be set. However, with increasing base circle diameter, the angle eventually reaches a value, in which the self-locking forces on the cam 19 do not prevent a rotational movement of the gear wheel via the push member 26 and the push rod 24 more. Then it is advantageous to move the push member 26 directly via the drive 23 and the ball screw 22, whereby the drive 7, 8, 9 is disengaged. Instead of the roller arches with tension bands, friction discs can of course also be used, whereby the The push rod is designed as a friction or rolling ruler.

[0018] For lower accuracy requirements, the roller arch with the tension bands can also be replaced by one attached to the push rod. 24 attached toothing. which is arranged with a roller arch 4 instead of the roller arch. The gear interacts.

[0019] The described device provides the possibility to adjust the distance between the push member 26 and the workpiece 1 along the length of the push rod. 24 to be dimensioned so that the lifting element 26, even in its extreme position on the right with respect to the drawing, does not interfere with the not shown The machine stand, which supports the tool 10, can collide. On the other hand, the relative position of the push member 26 with respect to the The workpiece slide 3 is set up so that its rightmost extreme position does not exceed the dimensions of the workpiece slide 3 together with the Drive 23 exits, thus also avoiding a collision between the push member 26 and the machine stand.

[0020] Moreover, the described device solves the problem underlying the main patent in a manner consistent with the invention, namely, to do so without To allow the replacement of individual drive elements for the workpiece slide 3, rolling processes continuously for any base circle diameter to generate values ​​close to zero to infinity without using base circular disks of different diameters in the previously practiced manner or Roller change wheels with different gear ratios must be available.

Claims

[0021] Patent claims [0022] 1. Device for controlling the rolling process during the production and machining of the tooth flanks of spur or helical gears With involute gearing in the intermittent rolling process, the workpiece to be machined is used to execute a rolling motion. rotatable workpiece table, which can be moved purely translationally via a workpiece slide, wherein the rotational component The push rod supplying the rolling motion is slidably guided on the workpiece slide and connected to a cam block via this is connected to the receiving guideway, which is rotatably arranged on the machine bed, and with which the gearing is generated. tool, wherein either the tool or the workpiece additionally performs a periodic back-and-forth movement, thereby characterized in that the push rod (24) is displaceable on the workpiece slide (3) in a direction parallel to the translational movement and with a second guide stone (27) into a guide track (25) of a perpendicular to the translational movement of the tool slide (3) 2. device according to Claim 1, characterized in that the push rod (24) is designed as a rack which engages with a gear connected to the workpiece (10). [0023] 3. Device according to claim 1, characterized in that the two ends of two tension bands (5) are attached to the push rod (24). are, whose two other barks are attached to a hollow arch (4) connected to the workpiece (1). [0024] 4. Device according to claim 1, characterized by a drive (, 9) which imparts translational movement to the workpiece slide (3). directly via a roller spindle (7). [0025] 5. Device according to claim 1, characterized in that the workpiece slide (3) is indirectly subjected to translational movement via a Drive (23) is granted, by which the snub element (26) is movable via a roller spindle (22). [0026] 6. Device according to claims 4 and 5, characterized in that the workpiece slide (3) can be accessed directly via the roller spindle (7) as is also indirectly movable via the roller spindle (22). [0027] 7. Device according to claim 6, characterized in that the spindles (7, 22) can be disengaged. [0028] 8. Device according to one of the preceding claims, characterized in that a measuring probe for testing is provided on the machine bed (6). is attached to the tooth flank shape. [0029] Blank page