JPH0815686B2 - Hobbing machine drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hobbing machine driving apparatus for manufacturing a spur gear, a helical gear or the like by cutting a work (gear material) with a hob (gear cutting tool).

[0002]

2. Description of the Related Art Generally, as shown in FIG. 2, a hobbing machine is mounted on a column (2) standing on one side of a bed (1) so as to be slidable in the vertical direction via a vertical feed mechanism (3). The hob saddle (4), the work table (6) rotatably mounted on the other side of the bed (1) through the indexing mechanism (5), and the angle change to the front side of the hob saddle (4) A hob head (8) mounted so that its angle can be changed via a mechanism (7), and both ends of which are supported by the hob head (8) and rotated from a main shaft (9) in a column (2) via a hob drive mechanism (10). The driven hob arbor (11), the hob (12) mounted on the hob arbor (11), the work (14) mounted on the work arbor (13) of the work table (6), and the work arbor (13). Slide head (15 It is provided with a door.

The vertical feed mechanism (3), the indexing mechanism (5), and the hob drive mechanism (10) must be driven in a predetermined relationship to cut the gear of interest, so that a common drive motor is used. (16) are interlocked with each other via the main shaft (9).

Recently, an NC hobbing machine is used. In this case, as shown in FIG. 3, the indexing mechanism (5) of the work table (6) is driven by another servo motor (17). There are also things. In this case, the other parts are the same as those in FIG.

In any case, the hob drive mechanism (10)
As shown in FIG. 4, the two relay shafts (10a) (10) are connected to the hob arbor (11) from the main shaft (9) in the column (2).
b) and bevel gears (10c) to (10f) and gears (10
g) The driving force is transmitted via (10h). In this case, the bevel gear (10c) on the main shaft (9) is rotatably supported by the hob saddle (4) and the hob saddle (4).
The main shaft (9) has a spline shaft portion formed at a portion corresponding to the vertical movement range of the hob saddle (4), and a spline groove corresponding to this is formed in the main shaft (9). The bevel gear (10c) is formed on the main shaft (9) by spline engagement with the bevel gear (10c) so that the bevel gear (10c) can slide in the axial direction and can rotate integrally.

The angle changing mechanism (7) allows the hob head (8) to turn left and right about the relay shaft (10a) with respect to the hob saddle (4) by about half a turn, respectively. The worm (7
b), worm wheel (7c), gear (7d) (7
The hob head (8) is swung via e). In this case, the gear (7e) is rotatably installed on the relay shaft (10a) and fixed to the hob head (8) so as to rotate integrally with the hob head (8).

When cutting the spur gear with the hobbing machine, as shown in FIG. 5, while rotating the hob (12), the hob (12) is moved downward to form a tooth groove (14a) on the outer peripheral portion of the work (14). Cut and form. The tooth groove (14a) is formed for one tooth or for a plurality of teeth, and the work (14) is indexed and rotated correspondingly. In the actual processing, the cutting edge of the hob (12) is formed in a spiral shape for setting the clearance angle even in the case of the spur gear, and normally, for one revolution of the hob (12). Work (14)
Is associated with rotating the tooth by a fraction of the number of teeth.

When cutting the helical gear,
The hob head (8) is swung by a predetermined angle by the angle changing mechanism (7), the axis of the hob arbor (11) is tilted so as to correspond to the tooth trace of the helical gear, and in this state, the work (14) also leads the tooth trace of the helical gear. The rotation corresponding to the corner is given.

[0009]

In the conventional hobbing machine, the driving force is extracted from the main shaft (9) installed in the column (2) as a driving source of the hob driving mechanism (10). In both cases of FIG. 2 and FIG. 3, the main shaft (9) requires a length equal to or longer than the vertical movement stroke of the hob saddle (4), so that torsion (torsion) is likely to occur. In particular, when observing the load state during cutting of the work (14), as shown in FIG. 5, the cutting load gradually increases from the upper end of the tooth groove (14a) in the tooth width direction (vertical direction in the figure) to the center position. , It decreases gradually from the center to the bottom. Moreover, hob (12)
The cutting by is also intermittent cutting, and since the cutting load changes from the start to the end of cutting as described above, the torsion amount of the spindle (9) changes depending on the cutting position of the work (14). Rotation of the hob (12) driven from the main shaft (9) via the hob drive mechanism (10) also causes a delay.

If the rotation of the hob (12) advances or lags, the tooth groove (14a) of the work (14) does not have the desired shape, and the machining accuracy is deteriorated. For example, when the spur gear is being cut, there are disadvantages that the tooth traces are inclined and the bottom of the tooth space is curved.

The present invention has been made in view of the above-mentioned drawbacks of the conventional hobbing machine and solves the problems. However, in order to solve the above-mentioned drawback, for example, in Fig. 4, it is possible to directly connect the drive motor and the speed reduction mechanism to one end of the hob arbor (11). When the helical gear is machined, the number of points that interfere with the work table (6) increases, and the weight balance of the hob head (8) is poor, making it suitable for the vertical feed mechanism (3) of the hob saddle (4) and the slide guide. There is a problem such as an unbalanced load.

An object of the present invention is to provide a driving device for a hobbing machine which can eliminate the above-mentioned drawbacks.

[0013]

In order to achieve the above object, the present invention provides a hob saddle mounted on a column erected on one side of a bed so as to be vertically slidable via a vertical feed mechanism, and a hob saddle. The hob arbor is attached so that it can be rotated, and the hob head is mounted on the front of the hob saddle so that the angle can be changed through the angle changing mechanism, and is rotatably mounted on the other side of the bed through the indexing mechanism. In a hobbing machine equipped with a work table, a hob drive motor is provided in the column on the side opposite to the hob head mounting direction with respect to the vertical slide guide surface of the hob saddle formed on the column, and the hob saddle vertical feed mechanism and work piece. It is mechanically separated from the table indexing mechanism and installed in a part of the hob saddle.The hob drive motor penetrates the angle changing pivot between the hob head and the hob saddle. It is obtained without to rotationally drive the Hobuaba of hob head Te.

[0014]

Since a long shaft does not exist between the hob drive motor and the hob arbor, the rotation of the hob due to cutting load fluctuation can be significantly reduced.

Further, since the hob driving motor is present in the column, there is no interference with the work table even during machining of the helical gear. Moreover, the hob head on the front side and the hob drive motor on the rear side are weight-balanced with respect to the slide guide surface of the hob saddle, and the adverse effect due to the unbalanced load can be prevented.

[0016]

FIG. 1 is a schematic front view of the device of the present invention,
(1) Bed, (2) Column, (3) Vertical Feed Mechanism, (4) Hob Saddle, (5) Indexing Mechanism, (6) Work Table, (7) Angle Changing Mechanism, ( 8) is a hob head, (10) is a hob drive mechanism, (11) is a hob arbor, (12) is a hob, (13) is a work arbor,
Since (14) is a work and (15) is a slide head, which are similar to the conventional hobbing machine, detailed description thereof will be omitted. However, the vertical feed mechanism (3) is driven by the first servo motor (18), and the indexing mechanism (5) is driven by the second servo motor (19). The hob drive mechanism (10) is driven by the hob drive motor (20). Each of these motors (18) (19) (2
Reference numeral 0) is driven by an NC controller (not shown) so as to be associated with each other so as to meet the target machining conditions of the gear.

The hob drive motor (20) is a part of the hob saddle (4), and the hob head (8) with respect to the vertical slide guide surface (21) of the hob saddle (4) formed on the column (2). ) Is installed in the column (2) on the side opposite to the mounting side. The hob drive motor (20) drives the hob arbor (11) via the hob drive mechanism (10) shown in FIG. Specifically, the hob head (8) and the hob saddle (4)
The angle is changed at the position of the relay shaft (10a) of FIG. 4 which serves as the pivot shaft portion, the pivot shaft portion (not shown) surrounding the relay shaft (10a) is passed through, and the bevel gears (10c) (10d) are removed. The relay shaft (10a) in this state is installed, and the hob drive motor (20) is connected to the left end of the relay shaft (10a), whereby the hob arbor (1) of the hob head (8) is connected.
1) is rotationally driven. In this case, the main shaft (9) in FIG. 4 is arranged so as to be displaced.

Since the apparatus of the present invention has the above-mentioned structure and does not have a long shaft in the drive system of the hob (12) as in the prior art, the hob ( It is possible to significantly reduce the occurrence of delay in the rotation of 12).

[0019]

As described above, according to the present invention, it is possible to remarkably reduce the advance and delay of the rotation of the hob arbor due to the load variation during the cutting of the work by the hob, so that the machining accuracy of the gear can be improved. Moreover, the present invention installs a hob drive motor that receives a cutting load, requires a large driving force, and is large and heavy in the column, so that the hob head, the work, and the work table side can be processed even when machining the helical gear. The interference with the members can be prevented, and the weight of the hob head can be reduced and the weight balance can be easily maintained.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of an NC hobbing machine of the device of the present invention.

FIG. 2 is a schematic front view showing an example of a conventional hobbing machine.

FIG. 3 is a schematic front view showing an example of a conventional NC hobbing machine.

FIG. 4 is a schematic perspective view of a hob drive mechanism.

FIG. 5 is an explanatory diagram of a gear cutting processing state by a hob.

[Explanation of symbols]

 1 bed 2 column 3 vertical feed mechanism 4 hob saddle 5 indexing mechanism 6 work table 7 angle changing mechanism 8 hob head 10 hob drive mechanism 11 hob arbor 12 hob 13 work arbor 14 work 15 slide head 20 hob drive motor

Claims (1)

[Claims] 1. A hob saddle that is vertically slidably mounted on a column that is erected on one side of a bed through a vertical feed mechanism, and a hob arbor that mounts the hob is rotatably installed, and the hob saddle is provided in front of the hob saddle. Formed in a column in a hobbing machine equipped with a hob head mounted so that its angle can be changed via an angle changing mechanism, and a work table mounted on the other side of the bed so as to be rotatable via an indexing mechanism. With respect to the vertical slide guide surface of the hob saddle, the hob drive motor is mechanically separated from the hob saddle vertical feed mechanism and work table indexing mechanism in the column on the side opposite to the mounting direction of the hob head. Installed on a part of the hob drive motor to rotate the hob head and hob saddle so that the hob arbor of the hob head can be rotated. Hobbing drive device characterized by the.