JPS6239115A - Helical angle automatic adjusting device for gear shaper - Google Patents

Abstract

PURPOSE:To improve productivity, by steplessly adjusting a helical angle so that a helical gear of plural kinds can be machined with no necessity for rearrangements. CONSTITUTION:A cam lever 25 performs an oscillating motion about an axis 26 serving as the center by motion of a cam integrally formed with a backoff driving shaft 24 synchronously rotating with vertical motion of a main spindle 11. The motion of said lever 25 causes a joint 27 to perform a lateral (horizontal) motion. The main spindle 11 simultaneously performs a rotary motion corresponding to a helical angle of a cutter 12 by controlling a rotary speed of a motor 20. Accordingly, the helical angle is steplessly adjusted. When a work is machined with a zero helical angle, it is only required to stop rotation of the motor 20.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a helical guide for a gear shaper, and is capable of automatically and steplessly adjusting the helical angle.

<Prior art> As shown in FIG. 3, which shows a cross-sectional side view of the helical guide mechanism of a gear shaper, a main shaft 2 on which a gear cutting tool is attached is capable of reciprocating once in the axial direction and is rotatable using a hydrostatic bearing 3. It is adapted to be reciprocated in the axial direction via a spherical bearing 5 by a connecting rod 4 guided by a crank mechanism and driven by a crank mechanism. A male helical guide 6 as shown in perspective in Fig. 4 is fixed to the main shaft 2, and a female helical guide 8 fitted to the franchise.
The male shape 6 is guided by the shaft 2, and the main shaft 2 rotates back and forth when reciprocating in the axial direction. The flange 7 is gear-cutted by a worm wheel 9 and a worm (not shown).
During machining, it is driven to rotate synchronously with the helical gear that is the workpiece.

Here, measure the lead length of the helical guide and gear cutting tool 1.
There is a relationship between the pitch circle diameter dCP and the following equation.

π・do, = L−ψ ...(
1) Here, ψ is the helix angle of the gear cutting tool 1, m is the normal module of the gear cutting tool 1, and Z is the number of teeth of the gear cutting tool 1.

Therefore, the helix angle that can be processed for one helical guide is one size.

<Problems to be Solved by the Invention> In the helical guide mechanism described above, it is impossible to change the helical angle when processing the helical gear unless the male type 6 and female type 8 of the helical guide are replaced. However, there are problems in that there are design restrictions or the processing setup change time is extremely long.

The present invention has been made in view of the above circumstances, and provides an automatic helical angle adjustment device for a gear shaper that can steplessly adjust the helical angle, thereby eliminating the need for setup changes for multiple types of helical gears with different helical angles. The purpose is to reduce design constraints of helical gears, shorten machining setup change time, and improve production efficiency.

Means for Solving the Problems〉 The structure of the present invention for achieving the above-mentioned object is to extend in the same direction as the rotational center axis of the rotating shaft for supporting the workpiece, rotate with the rotational center axis, and rotate in the axial direction. a reciprocating main shaft, a reciprocating drive means for driving the reciprocating movement of the main shaft, a guide member connected to the main shaft and rotating in accordance with a torsion angle of a cutter attached to the main shaft, and a guide member for rotating the guide member. a drive guide that supports the main shaft so as to be slidable in the rotational axis direction and drives and rotates the main shaft; a guide member rotation drive means that is attached to the drive guide and rotates the guide member; When the main shaft moves from one end side to the other end side in the axial direction, the main shaft is moved to the one end side in the direction crossing the axial direction in synchronization with the drive of the reciprocating drive means, so that the main shaft moves to the other end side in the axial direction. The main shaft is further provided with a back-off mechanism that moves the main shaft to the other end in a direction intersecting the axial direction in synchronization with the drive of the reciprocating drive means when the main shaft is moved from one end to the other end.

<Operation> The main shaft is reciprocated in the axial direction by the reciprocating drive means, and rotated by the drive guide in synchronization with the rotation of the rotating shaft for supporting the workpiece. When the main shaft reciprocates, the guide member rotation drive means rotates the guide member following the helix angle of the cutter, and the main shaft rotates in synchronization with the rotation of the rotating shaft for supporting the workpiece, and rotates in accordance with the helix angle of the cutter. Perform a combined rotation. In addition, due to the back-off mechanism, the main shaft synchronizes with the reciprocating motion in the axial direction, and moves toward one end in the direction that intersects with the axial direction during forward motion, and moves toward the other end in the direction that intersects with the axial direction during backward motion. .

Embodiments FIG. 1 shows a cross-sectional side view of an automatic helical angle adjustment device for a gear shaper according to an embodiment of the present invention, and FIG. 2 shows a process for explaining the movement of a cutter.

In FIG. 1, the main shaft 11 has a cutter 12 at its lower end.
is installed, and the main shaft 11 is fitted into the cutter head 13.
It is slidably guided by a bearing 14 in the axial direction and rotational direction.

The upper part of the main shaft 11 is a tapered shank portion 11a, and the tapered shank portion 11a is fitted into a tapered hole 15a of a male guide 15, which is a guide member. The male guide 15 is slidably guided in the axial and rotational directions via a bearing 18 by a wheel guide 17, which is a drive guide integrated with the wheel 16. Male guide 15
The upper end of the wheel 16 is connected via a flange 19 to a motor 20 having a spline shaft 20a whose rotation speed can be controlled, which is a guide member rotation driving means, and the wheel 16 is driven by a worm (not shown). A rack gear 21 is machined on the outer periphery of the main shaft 11, and the main shaft 11 is reciprocated in the axial direction by the repeated forward and reverse rotation of a gear 22, which is a reciprocating drive means that meshes with the rack gear 21. This forward and reverse rotational movement of the gear 22 is performed by the movement of a crank mechanism (not shown). The back-off *ll1123 is performed by the rotational movement of the back-off drive shaft 24, which is connected to a drive system (not shown) through a gear train, which reciprocates in the axial direction of the main shaft 11. Returning cams (not shown) are machined in two rows in the axial direction on this back-off drive shaft 24 integrally with the back-off drive shaft 24.
Each cam is in contact with two rollers 26cL of the cam lever 25, which are omitted. Further, the cam lever 25 is connected to a joint 27 via a shaft 26, and the center of connection between the shaft 26 and the joint 27 is eccentric to the center of rotation of the shaft 26. The joint 27 is connected via a pin 28 to a bearing 29 attached to the cutter head 3. In the figure, numeral 30 is a processing workpiece, and 31 is a motor support.

Next, the operation of the above configuration will be explained with reference to FIG.

The main shaft 11 is rotated in the axial direction by forward and reverse rotation of the gear 22.
When the main spindle 11 moves (up and down) and when the main shaft 11 moves up and down, the back-off mechanism 23 moves the cutter head 3 to the workpiece 3.
Move away from 0. In other words, the ascending end of the main shaft 11 is one end in the axial direction, and the descending end is the other end in the axial direction. Further, the position where the cutter head 3 is closer to the workpiece 30 side is one end side in the direction intersecting the axial direction of the main spindle 11, and the position away from the workpiece 30 is the other @ side in the direction intersecting the axial direction of the main spindle 11. It becomes. The cam lever 25 oscillates about the shaft 26 due to the integrated force of the pack-off drive shaft 24 which rotates in synchronization with the vertical movement of the main shaft 11 . The connection center between the joint 27 and the cam lever 25 is the shaft 26
Since the joint 27 is aligned with the center of rotation of the cam lever 25, the joint 27 moves left and right (horizontally) by the swinging movement of the cam lever 25. At the same time, the main shaft 11 performs a rotational movement corresponding to the helical angle of the cutter 2 by controlling the rotation speed of the motor 20. The synchronous rotation of the cutter 12 for creating teeth on the workpiece 30 is performed by a wheel 160 rotated by a worm shaft (not shown), similar to a general gear shaper.

The wheel 16 is connected to a wheel guide 17. Bearing 18, motor support 31. Motor 20. Flange 19. Male guide 1
5. Main shaft 11. They are each connected with bolts or the like so that they rotate together with the cutter 12.

The cutter 12 processes the workpiece 30 while rotating when the main shaft 11 is lowered, and the back-off mechanism 23 is used when the main shaft 11 is raised.
As a result, the cutter 12 is completely separated from the workpiece 30 and rises while rotating. The stroke width and number of strokes are selected so that at the top dead center of the vertical movement of the main shaft 11 (after the end of the - cycle), the amount of rotational movement of the cutter 12 is multiplied by the number of cutter blades minus the number of pitch xll.

When processing a workpiece with a helical angle of zero, it is sufficient to stop the rotation of the motor 20.

<Effects of the Invention> Since the automatic helical angle adjustment device for a gear shaper of the present invention can arbitrarily adjust the helical angle steplessly, the helical angle of the workpiece to be gear-cut can be arbitrarily set. As a result, it is possible to process multiple types of helical gears with different helical angles without changing setups, reducing constraints on the design of helical gears, shortening the time for changing setups, and improving production efficiency. becomes.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of an automatic helical angle adjustment device for a gear shaver according to an embodiment of the present invention, Fig. 2 is a process diagram explaining the movement of a cutter, and Fig. 3 is a cross-sectional side view of a conventional helical guide mechanism. , FIG. 4 is a perspective view of the male helical guide. In the drawing, 11 is a main shaft, 15 is a male type, 17 is a wheel guide, 19 is a flange, 20 is a motor, 22 is a gear, and 23 is a back-off mechanism. Figure 1

Claims (1)

[Claims] a main shaft that rotates with a rotational center shaft extending in the same direction as the rotational center axis of the rotational shaft for supporting the workpiece and is capable of reciprocating in the axial direction; a reciprocating drive means for driving the reciprocating motion of the main shaft; a guide member that rotates in accordance with the torsion angle of a cutter that is connected and attached to the main shaft; a drive guide that supports the guide member in a non-rotatable but slidable manner in the direction of the rotation axis and drives and rotates the main shaft; a guide member rotational drive means attached to a drive guide to rotationally drive the guide member; and a guide member rotation drive means that is synchronous with the drive of the reciprocating drive means when the main shaft moves in the axial direction from one end side to the other end side by the reciprocating drive means. and move the main shaft to one end side in a direction crossing the axial direction, and when the main shaft moves from the other end side to the one end side in the axial direction, the main shaft is moved in the axial direction in synchronization with the drive of the reciprocating drive means. An automatic helical angle adjustment device for a gear shaper, which is equipped with a back-off mechanism that moves the gear shaper to the other end in the intersecting direction.