JPH08276321A - Attachment for work rack processing - Google Patents

Abstract

PURPOSE: To provide an attachment by which the processing of a work rack is made possible even in a planer-type machining center. CONSTITUTION: A cylindrical rotary shaft 2 is provided rotatable in a main casing 1, a driving motor 9 is connected to the base end side of the rotary shaft 2 through various gears 3 to 8, a rotation shaft 10 providing a driving shaft 11 at the front end is set rotatable in the rotary shaft 2, a rotary motor 14 is connected at the base end side of the rotation shaft 10 through gears 12 and 13, a head casing 15 is connected to the front end of the rotary shaft 2, and an attachment main shaft 16 whose axial center is orthogonal to the axial center of the driving shaft 11 is provided in the head casing 15. While the attachment main shaft 16 is connected to the bevel gear 11a of the driving shaft 11 through a bevel gear 17, a holding casing 20 is fitted rotatable to the upper part of the main body casing 1, and a work 21 provided rotatable to the holding casing 20 is geared to the worm wheel 19 of the cylinder 18 of the main body casing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment used when a worm rack is machined by a machine tool, and is particularly effective when applied to a gate type machining center or a horizontal boring and milling machine.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a portal machining center for automatically machining a work. As shown in FIG. 2, the portal machining center 40 can linearly move the table 41 on which the work 50 is placed while automatically controlling it in the X-axis direction, which is the front-back direction in FIG. In FIG. 2, a spindle 42 holding the tool 30 for machining
It is possible to linearly move while automatically controlling in the Y-axis direction which is the left-right direction and the Z-axis direction which is the up-down direction. Therefore, by moving the table 41 in the X-axis direction and moving the main shaft 42 in the Y-axis direction and the Z-axis direction, respectively, the work 50 can be processed into various shapes by the tool 30.

[0003]

By the way, the work 50
By cutting the worm rack 51 as shown in FIG.
When trying to obtain, while rotating the cutting tool,
As shown in FIG. 4, cutting is performed around the center point C of the radius of curvature R of the valley portion of the worm rack 51 so that the blade portion of the cutting tool 31 moves along the valley portion of the teeth of the worm rack 51. The tool 31 has to be rotated. However, in the portal type machining center 40 as described above,
Since the turning angle α as shown in FIG. 4 cannot be given to the cutting tool 31, the work 50 cannot be processed into the worm rack 51.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, an attachment body detachably attached to a spindle of a machine tool and supporting a cutting tool, and an operation provided on the attachment body to operate the cutting tool. Means, adjusting means for adjusting the direction of the cutting tool in the feed direction so as to correspond to the lead angle of the teeth of the worm rack machined into the work, and the work provided for the work. The rotation of the cutting tool in a direction intersecting the feed direction so that the cutting tool moves along the valley with the center point of the radius of curvature of the valley of the tooth of the worm rack being processed as the center. The above-mentioned problems are solved by the attachment for worm rack processing, which is characterized in that it is provided with a moving means.

Further, the attachment for worm rack machining according to the present invention is characterized in that it is provided with a detecting means for detecting the turning position of the cutting tool.

[0006]

According to the worm rack machining attachment of the present invention, the adjusting means adjusts the direction of the cutting tool in the feed direction so as to correspond to the lead angle of the teeth of the worm rack to be machined into the work, and the working means performs cutting. After activating the tool,
The turning tool rotates the cutting tool in a direction intersecting the feed direction so that the cutting tool moves along the above-mentioned trough centering on the center point of the curvature radius of the trough of the worm rack to be processed. By moving the cutting tool and the workpiece relatively while moving the workpiece, the workpiece can be processed into a warm rack.

Further, the detecting means detects the rotational position of the cutting tool, and based on the detection result, the relative feed position between the workpiece and the cutting tool and the rotational position of the cutting tool form a worm for machining the workpiece. By adjusting so as to correspond to the leads of the rack teeth, the worm rack can be processed more accurately.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the attachment for warm rack machining according to the present invention will be described with reference to FIG. FIG.
FIG.

As shown in FIG. 1, a cylindrical rotary shaft 2 is rotatably provided inside the main body casing 1, and the tip of the rotary shaft 2 projects from the main body casing 1. ing. A worm wheel 3 is coaxially provided at the base end of the rotating shaft 2. Worm wheel 3
Includes a shaft 4a rotatably supported by the main body casing 1.
A worm 4 coaxially provided on the worm meshes with the worm 4. A gear 5 is coaxially provided on the shaft 4a of the worm 4. The gear 5 is provided with a gear 6 coaxially with a shaft 7a rotatably supported by the main body casing 1.
And a worm wheel 7 is coaxially provided on the shaft 7a. On the worm wheel 7,
A worm 8 coaxially provided on a shaft 8a rotatably supported by the main body casing 1 meshes with the shaft. A rotary shaft 9a of a drive motor 9 provided on the outer surface of the main body casing 1 is coaxially connected to one end of a shaft 8a of the worm 8.

That is, by operating the drive motor 9, the rotary shaft 2 is moved through the worm 8, the worm wheel 7, the gear 6, the gear 5, the worm 4, and the worm wheel 3.
Is designed to rotate.

As shown in FIG. 1, a rotary shaft 10 is rotatably provided inside the rotary shaft 2 so as to be coaxial with the rotary shaft 2.
The base end of is projected from the base end of the rotary shaft 2. A drive shaft 11 is provided coaxially on the tip end side of the rotary shaft 10, and the drive shaft 11 is adapted to rotate integrally with the rotary shaft 10 with respect to the rotary shaft 2. . A bevel gear 11a is coaxially formed at the tip of the drive shaft 11. A gear 12 is coaxially provided at the base end of the rotary shaft 10. Gear 12
Is a gear 13 provided coaxially with a rotary shaft 14a of a rotary motor 14 provided on the outer surface of the main body casing 1.
Are in mesh.

That is, by operating the rotary motor 14, the rotary shaft 10 is moved through the gear 13 and the gear 12.
Rotates with respect to the rotating shaft 2, and the rotating shaft 10
The drive shaft 11 is also rotated along with the rotation.

As shown in FIG. 1, a head casing 15 is attached to the tip of the rotary shaft 2. Inside the head casing 15, an attachment spindle 1 with its axis oriented in a direction orthogonal to the axis of the drive shaft 11.
6 is rotatably provided, and the tip of the attachment main shaft 16 projects from the head casing 15. The bevel gear 1 is provided on the base end side of the attachment spindle 16.
7 is provided coaxially, and this bevel gear 17
Engages with the bevel gear 11a of the drive shaft 11. A cutting tool 31 is attached to the tip of the attachment spindle 16.

That is, by operating the drive motor 9 to rotate the rotary shaft 2, the head casing 15 rotates, and the cutting tool 31 always keeps its tip outside through the attachment main shaft 16. While moving in an arc while moving toward, the rotary motor 14 is actuated to rotate the drive shaft 11 via the rotary shaft 10, whereby the bevel gear 11a and the bevel gear 17 of the drive shaft 11 are rotated.
The attachment spindle 16 rotates through the cutting tool 3
1 is designed to rotate.

On the other hand, as shown in FIG. 1, a cylinder 18 is provided upright on the upper portion of the main body casing 1. A worm wheel 19 is coaxially provided on the upper end side of the cylinder 18. The cylinder 18 and the worm wheel 19
Is rotatably inserted inside the cylindrical holding casing 20. The worm wheel 19 meshes with a worm 21 that is provided coaxially with a shaft 21a that is rotatably supported inside the holding casing 20. A rotating shaft of an adjusting motor (not shown) provided on the outer surface of the holding casing 20 is coaxially connected to one end of the shaft 21a of the worm 21.

That is, by operating the adjusting motor, the cylinder 18 rotates via the worm 21 and the worm wheel 19, and the main body casing 1 rotates with respect to the holding casing 20. As a result, the attachment spindle 1 of the head casing 15
The cutting tool 31 attached to the tip of the
It is possible to turn so as to revolve around the axis of 8.

As shown in FIG. 1, the main body casing 1 is
While being connected to the holding casing 20 by the bolts 22, the turning position with respect to the holding casing 20 is fixed. The holding casing 20 is attached to the main shaft 42 of the portal machining center with bolts 23.

Further, as shown in FIG. 1, the drive motor 9 is provided with a detector 24 for detecting the rotation angle of the rotation shaft 9a of the drive motor 9. This drive motor 9
The detector 24 and the detector 24 are electrically connected to a control mechanism (not shown) of the portal machining center.

In the warm rack machining attachment of the present embodiment as described above, the attachment body is constituted by the main body casing 1, the head casing 15, the cylinder 18, the holding casing 20, etc., and the rotary shaft 10,
The drive shaft 11, the gears 12, 13, the rotary motor 14, the attachment main shaft 16, the bevel gear 17 and the like constitute an operating means, and the worm wheel 19, the worm 21, the adjusting motor and the like constitute an adjusting means, and the rotating shaft 2 ,
Worm wheel 3, 7, worm 4, 8, gear 5,
6, the driving motor 9 and the like constitute the rotating means, and the detector 24 and the like constitute the detecting means.

Such a warm rack processing attachment is used as follows. The holding casing 20 is attached to the main shaft 41 of the portal type machining center and the work is set on the table of the machining center.
The radius of curvature R of the root of the blade of the worm rack 51, which is machined into a workpiece, is the length of the axis of the drive shaft 11 and the blade of the cutting tool 31.
(See FIG. 4) The cutting tool 31 is attached to the attachment spindle 16. The adjustment motor is operated to rotate the main body casing 1 so that the lead angle β (see FIG. 5) of the teeth of the worm rack 51 to be processed into a workpiece and the direction of the cutting portion of the cutting tool 31 with respect to the feed direction match. .

The rotating motor 14 is operated to rotate the cutting tool 31, while the axis of the drive shaft 11 and the radius R are
After moving the main shaft 42 of the machining center so that the center point C of the machining center (see FIG. 4) coincides, the drive motor 9 is operated to rotate the cutting tool 31 in a direction intersecting the feed direction. , The table of the machining center is moved at a predetermined speed, and the cutting tool 31 and the work are relatively fed.

At this time, the detector 24 detects the rotation angle of the rotary shaft 9a of the drive motor 9, and the control mechanism of the machining center detects the rotary shaft 9a of the drive motor 9 based on the signal from the detector 24. The drive motor 9 is controlled so that the rotational position corresponds to the feed position of the table of the machining center. In other words, the relative feed position between the work and the cutting tool 31 and the rotation angle α (see FIG. 4) of the cutting tool 31 correspond to the lead 1 (see FIG. 5) of the worm rack tooth to be processed into the work. Thus, the control mechanism controls the drive motor 9 based on the signal from the detector 24.

In this way, the worm rack 51 is obtained by cutting the work with the cutting tool 31. Therefore, the portal machining center 40 as described above is used.
However, it is possible to give the work a warm rack.

[0024]

As described above, according to the attachment for machining a warm rack of the present invention, even a machine tool such as a gate type machining center or a horizontal boring and milling machine can easily machine a work into a warm rack. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a warm rack machining attachment according to the present invention.

FIG. 2 is a schematic structural diagram of a gate type machining center.

FIG. 3 is an external view of a worm rack.

FIG. 4 is a sectional view of a worm rack.

FIG. 5 is a plan view of the worm rack.

[Explanation of symbols]

 1 Main Body Casing 2 Rotating Shafts 3, 7, 19 Worm Wheels 4, 8, 21 Worms 5, 6, 12, 13 Gears 9 Drive Motor 10 Rotating Shaft 11 Drive Shaft 14 Rotating Motor 15 Head Casing 16 Attachment Main Spindle 17 Bevel Gear 18 Cylindrical 20 Holding casing 24 Detector

Claims (2)

[Claims] 1. An attachment body detachably attached to a main shaft of a machine tool, which supports a cutting tool, an operating means provided on the attachment body, for operating the cutting tool, and provided on the attachment body, Adjusting means for adjusting the direction of the cutting tool in the feed direction so as to correspond to the lead angle of the teeth of the worm rack to be processed into a work, and the trough portion of the teeth of the worm rack provided to the attachment body to be processed into the work. Rotation means for rotating the cutting tool in a direction intersecting the feed direction so that the cutting tool moves along the valley portion around the center point of the radius of curvature of the. Attachment for warm rack processing. 2. The attachment for worm rack machining according to claim 1, further comprising detection means for detecting a rotational position of the cutting tool.