JPS5918171B2 - gear shaping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an IJ-ping mechanism in a gear shaping machine.

During gear cutting, a gear shaping machine has a rotating shaft that supports the workpiece, that is, a gear blank, and a cutter shaft that is disposed parallel to the rotating shaft and reciprocates in the axial direction and rotates in synchronization with the rotating shaft. Although the cutter shaft reciprocates, the cutter shaft must make a linear stroke to perform gear cutting in the past, and must stroke while moving away from the workpiece when returning.

This series of oscillating movements of the cutter shaft is generally referred to as an IJ-ping movement, and various mechanisms have heretofore been employed as devices for performing this relieving movement.

An example of an apparatus for performing IJ-ping motion is shown in FIGS. 3 and 4.

In the figure, 1 indicates an IJ IJ-ping device, 2 is a frame, 3 is a drive shaft rotatably supported by the frame via a bearing 4, 5 is an eccentric shaft portion formed on the drive shaft 3, A connecting member 7 is fitted onto the outer periphery via a bearing.

In this device, when the drive shaft 3 repeatedly swings around its axis as shown by the arrow a in the figure, the movement is transmitted to the connecting member 7 via the eccentric shaft portion 5, and the connecting member 7 is moved in the direction indicated by the arrow a in the figure. Perform a reciprocating movement along the approximate straight line as shown in .

The connecting member 7 is connected to a cutter head 8 of a gear shaping machine as shown in FIG.

FIG. 1 shows a conventional gear shaping machine, in which 10 is a part of a column, which supports a cutter head 8 via a support shaft 9 so as to be able to swing freely.

A joining member 11 is fixed to the cutter head 8, and this joining member 11 and the IJ
It is connected to the connecting member 7 of the IJ-ping device 1 via a pin 12 and a spherical bearing 13.

Therefore, as the connecting member 7 repeats the reciprocating motion, the cutter head 8 swings and performs a relieving motion.

In this operation, the connecting member 7 moves linearly, while the cutter head swings, which is a difference in movement between the two, but this is absorbed by the spherical bearing 13.

However, spherical bearings require a clearance for sliding, and as they are used over time, the clearance increases.

This results in an increase in vibration and a decrease in machining accuracy.

The present invention is provided in order to eliminate the drawbacks caused by the conventional IJ IJ-ping mechanism in gear shaping machines, and its gist is that the connecting member in the conventional example is made of an elastic body, and the connecting member and The reason for this is that the elastic body absorbs differences in the movement of the cutter head.

Embodiments according to the present invention will be described below based on the drawings.

21 shows the IJ IJ-ping device, whose structure is the third one.
As shown in FIG. 4 and FIG. 4, the operation is similar to that described above, but the connecting member 22 is made of an elastic body and is directly fixed to the cutter head 23 by a bolt 27.

The cutter head 23 is supported by the shaft 9 on the column 10 of the gear shaping machine.
It is attached via the support shaft 9 and is swingable around the support shaft 9.

24 is a cutter shaft supported by the cutter head 23 so as to be movable up and down, 25 is a pinion cutter attached to the tip of the cutter shaft 24, and 26 is a processing gear.

The cutter shaft 24 is driven by a drive device (not shown) in the directions of the arrows shown in FIG. 2, that is, vertically and rotationally.

Furthermore, if the drive shaft 3 of the IJ IJ-ping device 21 is rotated by a device not shown so as to be synchronized with the vertical movement of the cutter shaft, the connecting member 7 will pull the cutter head 23 when the cutter shaft 24 is raised, and the relieving Do exercise.

Therefore, the movement of the pinion cutter 25 in this device is as shown in FIG.

That is, A is a processing stroke (downward), B is a relieving stroke, and C is a turning stroke (upward).

In the relieving motion during the return stroke, the difference between the linear motion of the connecting member 7 and the swinging motion of the cutter head 23 is absorbed by the deformation of the connecting member 7, as shown in FIG.

As explained above, according to the present invention, since the connecting member for swinging the cutter head of the gear shaping machine is made of an elastic body, it is possible to eliminate the disadvantages of conventional equipment such as generation of vibration due to gaps and reduction in machining accuracy, and This has the effect of shortening machining time and improving machine durability by improving conditions.

Brief description of the drawings □ Fig. 1 is a front view showing a conventional device, Fig. 2 is a front view showing an embodiment according to the present invention, Fig. 3 is a partial sectional view of the lJ'lJ-ping device, and Fig. 4 is a front view showing a conventional device. FIG. 3 is a view taken along the line IV-IV in FIG. 3, FIG. 5 is an explanatory diagram showing the movement of the pinion cutter, and FIG. 6 is an explanatory diagram of the connecting member.

9... Support shaft, 10... Column, 21... Relieving device, 22... Connecting member, 23... Cutter head, 24... Spindle, 25... Cutter, 26
...Workpiece, 27...Bolt.

Claims (1)

[Claims] 1. A cutter head is swingably supported, and the cutter shaft, which is provided so as to be able to reciprocate in the axial direction with respect to the cutter head, performs gear cutting by alternately performing machining strokes and punching strokes. In a gear shaping machine having a working end connected to a cutter head and having means for swinging the cutter head during a return stroke of the cutter shaft, a portion of the means for swinging the cutter head that is connected to the cutter head. A gear shaping machine characterized by being made of an elastic body.