JPH06238516A - Chamfering device for gear - Google Patents

Abstract

PURPOSE:To carry out chamfering of a gear side end part as it is after a gear is manufactured by way of machining a work by using a chamfering mechanism constituted to install on a vertical type hob plate to manufacture the gear by a hob and a counter column of this hob plate. CONSTITUTION:When a work 5 is installed on a work holder 10 and a motor 14 is started by pressing a start switch, its rotation is transmitted to the work holder 10 through a shaft 15 and bevel gears 16, 18, and the work 5 is rotated in a horizontal surface and simultaneously, a hob 12 is rotated with a hob arbor 13. By moving a hob head 11 in the vertical direction, gear cutting maching is applied to the work 5 by the hob 12 and a gear is manufactured. Thereafter, after the hob head 11 is moved to a stand-by position, rotational speed of the motor 14, that is, rotational speed of the gear 5 is changed over to rotational speed synchronous with movement of a chamfering mechanism 3, simultaneously a motor of the chamfering mechanism 3 is rotated, a tooth tool 26 is oscillated through a cam mechanism and others, and chamfering of a side end part of a tooth of the gear 5 is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear chamfering device, and more particularly to a counter column of a vertical hobbing machine equipped with a new chamfering mechanism without removing a gear manufactured by the vertical hobbing machine. The present invention relates to a chamfering device for a gear, which is capable of automatically chamfering the side ends of the teeth of the gear following the cutting work.

[0002]

2. Description of the Related Art As a gear processing device, various devices have been put to practical use, and one of the most efficient processing devices at present.
A hobbing machine that uses a hob to perform gear cutting is often used.

On the other hand, a gear used in a vehicle transmission or the like has a burr at the side end of the gear when machined with a hobbing machine. Therefore, the gear to be meshed by moving the gear in the axial direction at the time of gear shifting is changed. Since it is designed to perform gear shifting, it is necessary to prevent damage to the side end surface of the gear due to interference between the side surfaces of the gear at the time of gear shifting and dents or the like during transport in the machining process. It is necessary to chamfer.

Conventionally, the chamfering of the side end portion of the gear is only chamfering after the gear is manufactured by hobbing with a hobbing machine and then the gear is removed from the hobbing machine and reattached to another chamfering machine. Was going on.

Such machining requires extra man-hours for remounting the gear to another chamfering machine, which not only prevents efficient machining, but also causes a mounting error due to remounting, resulting in a side end portion of the gear. The size of the chamfer is different each time, and there is a drawback that variations occur among products.

Further, it is necessary to provide two dedicated machines, a hobbing machine for gear cutting and a chamfering machine for chamfering, which not only increases the capital investment cost but also increases the efficiency of the factory site. There was a problem in using it.

As a solution to the above problems, 2
A device that attaches various types of hobs to one hob arbor and continuously performs different gear cutting and chamfering without removing the work is a practically open machine 61-13122.
5 are disclosed.

According to the apparatus, however, in the case where a large number of gears are arranged on one shaft, such as a vehicle counter shaft, for gear cutting when chamfering the side end of the gear. The hob sometimes interferes with other gears, limiting the usable range.

Further, since the hob arbor is long because two kinds of hobs are attached, bending due to machining resistance is likely to occur during gear cutting, and thus it is difficult to perform high-precision machining. On the other hand, if a short hob arbor is used, there is a problem that the hob is exchanged more frequently and the life is shortened though the deflection is small.

However, in order to attach the two types of hobs, it is necessary to use a dedicated hobbing machine having a long hob arbor, and it is difficult to use the conventional hobbing machine, and there is room for improvement.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art. The object of the present invention is to provide a vertical hobbing machine for manufacturing gears by hobs, and Using a chamfering mechanism configured to be mounted on a counter column of a vertical hobbing machine, a work is processed to produce a gear, and then the side end portion of the gear is removed without removing the gear from the vertical hobbing machine. Chamfering of the gears, and by doing this, it is possible to manufacture gears extremely efficiently, and to eliminate the mounting error due to remounting and to manufacture high precision gears. Is.

Another object of the present invention is that the conventional structure 2
By making it possible to perform the processing that was performed by one dedicated machine with one device, and by doing so, the cost required for capital investment can be reduced and the factory site can be effectively used. is there.

Still another object is to reduce the size of the gear chamfering device by arranging a chamfering device for gears at one end of the chamfering device, and swinging the cutter blade holder rotatably supported at the center in a vertical direction by a cam. It is to be able to provide a chamfering device of the gear of (1), and thereby to be able to easily mount the chamfering device of the gear to the counter column of the vertical hobbing machine.

Another object is to provide a hob head to which a hob is mounted, a chamfering mechanism mounted to a counter column, and a sensor for detecting that the hob head has moved to a standby position, and to perform gear cutting by the hob. After that, by moving the hob head to the standby position, the operation of the hobbing machine is automatically switched from the hob to the chamfering mechanism so that the chamfering processing of the side ends of the gear teeth can be continuously performed. It is to be.

[0015]

In summary, according to the present invention (claim 1), while rotating a work mounted on a work holder, a hob is operated in synchronization with the rotation of the work to machine the work to form a gear. A vertical hobbing machine to be manufactured, and the vertical cutting tool is mounted on a counter column of the vertical hobbing machine to operate the cutting tool in the vertical direction in synchronization with the rotation of the work to move the cutting tool along the side ends of the teeth of the gear. And a chamfering mechanism that moves the chamfering of the side end portion of the tooth.

According to the present invention (claim 2), a cam which is rotationally driven by a drive device and a cutting tool which is rotatably supported in the central portion and whose one end engages with the cam and is attached to the other end. And a tooth holder of the gear that is mounted on the counter column of the vertical hobbing machine and operates the blade in synchronization with the rotation of the gear manufactured by the vertical hobbing machine. The chamfering process is performed on the side end of the.

Further, according to the present invention (claim 3), a work holder for rotating the mounted work in a horizontal plane, and a hob mounted and operating in synchronization with rotation of the work, perform gear cutting on the work. A hob head, a chamfering mechanism that is mounted on a counter column, operates vertically to synchronize with the rotation of the work, and chamfers the side ends of the teeth of the gear, and detects that the hob head has moved to the standby position. A sensor for switching the operation of the hob head and the chamfering mechanism by sending a detection signal, and after hobbing the workpiece by the hob, move the hob head to the standby position to output from the sensor. The chamfering mechanism is operated in response to the detection signal to chamfer the side end portions of the gear teeth.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 to 3, a gear chamfering device 1 according to the present invention includes a vertical hobbing machine 2, a chamfering mechanism 3, and a sensor 4.

The vertical hobbing machine 2 processes the work to form the gear 5
A known device for manufacturing
A column 8 and a counter column 9 are provided upright from the base 6, and a work holder 10 is arranged between the column 8 and the counter column 9.

A hob head 11 is arranged on the column 8 so as to be vertically movable (direction of arrow A or B), and a hob arbor 13 having a hob 12 mounted thereon is rotatably provided on the hob head 11. .

The work holder 10 is for mounting a work, which is a material of the gear 5, and is rotatably arranged on the base 6 so as to face the hob head 11 in a horizontal plane.

The hob 12 and the work holder 10 are connected to each other by a known mechanism so that the hob 12 and the work holder 10 operate synchronously with each other. For example, the work holder 10 meshes with a small bevel gear 16 fixed to a shaft 15. It is connected to the motor 14 by a large bevel gear 18 and is configured to rotate the work in a horizontal plane in synchronization with the rotation of the hob 12.

The counter column 9 is for mounting a long work which cannot be mounted on the work holder 10 and is processed by the hob 12, and has a male dovetail groove 9a formed on its side surface.

Various tools are attached to the male dovetail groove 9a in accordance with the type of processing, but normally a center stand 19 for attaching a long workpiece is provided.

The chamfering mechanism 3 is for chamfering the side ends 5b of the teeth 5a of the gear 5 machined by the hob 12, and in FIG. 2 and FIG. 3, the female dovetail groove 2 is formed on the side surface.
The L-shaped base 20 on which 0a is formed is fitted and attached to the male dovetail groove 9a of the counter column 9.

A semi-cylindrical positioning member 21 is fixed to a base 21 of the chamfering mechanism 3 with bolts 22, and L
It is configured so that it is engaged with a positioning V groove 20c formed on the platform 20 and is always attached at the same position.

A base 21 of the chamfering mechanism 3 is fixed on a horizontal base portion 20b of the L-shaped base 20 via a spacer 23 for height adjustment.

A blade holder 24 is rotatably arranged around a shaft 25 on the base 21, a blade 26 is fixed to one end 24a of the blade holder 24, and a cam follower 28 is attached to the other end 24b. It is mounted rotatably by a pin 29.

A motor 31, which is an example of a driving device connected to the inverter 30 by an electric cord 50, is fixed to the base 21 by a bolt 32, and a small gear 34 is fixed to a rotary shaft 33 of the motor 31. There is.

A large gear 38 is fixed to a shaft 36 to which a cam 35 that engages with the cam follower 28 is fixed.
The small gear 34 meshes with the small gear 34 to rotate the motor 31.
It transmits to the cutting tool holder 24 via the large gear 38, the shaft 36, the cam 35, and the cam follower 28, and the cutting tool holder 24 is moved to the shaft 2.
It is configured to swing in the direction of arrow C or D in FIG.

Pins 39 and 40 are provided on both sides of the shaft 25 of the cutting tool holder 24 and fixed to the base 21.
Tensile springs 43 and 44 are mounted between 1 and 42, respectively.

The spring force of the tension spring 44 is equal to that of the tension spring 4
It is set to be larger than the spring force of 3, and the cam follower 28 is always engaged with the cam 35.

The sensor 4 is for detecting the position of the hob head 11 and is arranged above the column 8. For this purpose, for example, a micro switch is used, and the hob head 11 is moved in the direction of arrow A or B. When it moves in the direction, separates from the work holder 10 and moves to the standby position, this is detected and a detection signal is sent out.

The control device 60 is for controlling each part of the gear chamfering device 1 so as to be synchronized with each other, and is configured as a known computer including a central processing unit 61, an external storage device 62, and an input / output port 63. The input / output port 63, the sensor 4, the motor 14 and the motor 31 are electrically connected by electric cords 51, 52 and 53, respectively.

The present invention is configured as described above,
The operation will be described below. 1 and 2, the work is attached to the work holder 10, and a start switch (not shown) is pressed to start the motor 14.

The rotation of the motor 14 is transmitted to the work holder 10 via the shaft 15, the small bevel gear 16, and the large bevel gear 18 to rotate the work in the horizontal plane, and at the same time, the hob 12
Is rotated together with the hob arbor 13.

Then, the hob head 11 is lowered in the direction of arrow B or raised in the direction of arrow A, and while the workpiece holder 10, that is, the workpiece and the hob 12 are synchronously rotated, the workpiece is cut by the hob 12 according to a known procedure. Then, the gear 5 is manufactured.

When the gear cutting process by the hob 12 is completed, the hob head 11 moves up to the standby position in the direction of arrow A or down in the direction of arrow B according to a command signal from the control device 60.

When the hob head 11 rises to the standby position, the sensor 4 detects it and sends a signal to the control device 60, which switches the operation of the vertical hobbing machine 2 from the gear cutting action to the chamfering action. Therefore, a signal is sent to the motor 14 and the chamfering mechanism 3 to switch the rotational speed of the motor 14, that is, the rotational speed of the gear 5 to a rotational speed synchronized with the movement of the chamfering mechanism 3.

Next, the operation of the chamfering mechanism 3 will be described.
When the motor 31 is rotated by a command from the control device 60, the rotation is decelerated by the small gear 34 and the large gear 38, and then transmitted to the blade holder 24 via the cam 35 and the cam follower 28, and the blade holder 24 is rotated. It is swung about arrow 25 in the direction of arrow C or D.

Here, the rotation of the motor 14 swings the blade holder 24 in the direction of arrow C or D so that the relative movement of the blade 26 with respect to the gear 5 follows the shape of the side end 5b of the tooth 5a. The gear 5 rotates under the control of the control device 60 in synchronization with the dynamic motion.

That is, when the blade 26 descends in the direction of arrow C with the rotation of the gear 5, the blade 26 sequentially contacts the side end 5b from the tip of the tooth 5a toward the root, and chamfers the side end 5b. Perform processing.

When chamfering of one tooth 5a is completed,
The cutting tool 26 rises in the direction of the arrow D according to the shape of the cam 35, and the gear 5 rotates by one tooth during this time so that the next tooth 5a faces the cutting tool 26 and prepares for the next chamfering process.

The same operation is repeated thereafter, and the gear 5
Chamfering of all the teeth 5a is sequentially performed.

[0045]

As described above, the present invention uses the vertical hobbing machine for manufacturing gears by the hob as described above, and the chamfering mechanism configured to be mounted on the counter column of the vertical hobbing machine. After manufacturing the gear, the side end of the gear can be chamfered without removing the gear from the vertical hobbing machine, and as a result, the gear can be manufactured very efficiently. There is an effect that a highly accurate gear can be manufactured by eliminating the mounting error caused by the remounting.

Further, with the above construction, there is an effect that the processing which has been conventionally performed by two dedicated machines can be processed by one apparatus, and as a result, the cost required for facility investment can be reduced, and the factory site can be made effective. There is an effect available.

Further, since the gear chamfering device is constructed such that the blade holder mounted on one end of the gear and rotatably supported in the central portion is vertically swung by the cam, the chamfering of a small gear is performed. It is possible to provide a device, and as a result, the chamfering device of the gear can be easily attached to the counter column of the vertical hobbing machine.

Further, the hob head equipped with the hob, the chamfering mechanism mounted on the counter column, and the sensor for detecting that the hob head has moved to the standby position are provided. Since it is moved to the standby position, the operation of the hobbing machine is automatically switched from the hob to the chamfering mechanism, and it is possible to continuously chamfer the side ends of the gear teeth. Is obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an entire gear chamfering device, including a block diagram.

FIG. 2 is a vertical sectional view of a chamfering mechanism.

FIG. 3 is a plan view of an essential part showing a mounted state of a chamfering mechanism.

FIG. 4 is a partial perspective view of a gear showing a chamfered state of a side end portion of a tooth.

FIG. 5 is a partial cross-sectional view of a gear showing a chamfered state of a side end portion of a tooth.

[Explanation of symbols]

 1 Gear Chamfering Device 2 Vertical Hobbing Machine 3 Chamfering Mechanism 4 Sensor 5 Gear 5b Gear Teeth Side Ends 9 Counter Column 10 Work Holder 11 Hob Head 12 Hob 24 Cutting Tool Holder 26 Cutting Tool 31 Motor as an Example of Driving Device 35 Cam

Claims (3)

[Claims] 1. A vertical hobbing machine for manufacturing a gear by working a hob in synchronism with rotation of the work while rotating the work mounted on a work holder, and a vertical hobbing machine for the vertical hobbing machine. A chamfering process is performed on a side end portion of a tooth mounted on a counter column to move the blade tool along a side end portion of a tooth of the gear by vertically operating the blade tool in synchronization with rotation of the work. A chamfering device for gears, comprising a chamfering mechanism. 2. A cam rotationally driven by a drive device,
It consists of a blade holder that is rotatably supported in the center and has one end engaged with the cam to swing the blade mounted on the other end in the vertical direction, and is mounted on the counter column of the vertical hobbing machine. A chamfering device for gears, characterized in that the cutting tool is actuated in synchronism with the rotation of a gear manufactured by the vertical hobbing machine to chamfer the side ends of the teeth of the gear. 3. A work holder for rotating the mounted work in a horizontal plane, a hob mounted and a hob head for operating the work in synchronization with rotation of the work to perform gear cutting processing on the work, and mounted on a counter column. A chamfering mechanism that operates in the vertical direction in synchronization with the rotation of the work to chamfer the side ends of the teeth of the gear, and sends a detection signal by detecting that the hob head has moved to the standby position and sends the detection signal. And a sensor for switching the operation of the chamfering mechanism, the hob head is moved to the standby position after the workpiece is cut by the hob, and the chamfering is performed in response to a detection signal from the sensor. A chamfering device for gears, characterized in that the mechanism is operated to chamfer the side ends of the teeth of the gears.