JPS62148111A - Eccentric tool test - Google Patents

Abstract

PURPOSE:To enable heavy cut with large torque by providing a casing and a rotary tool spindle having the rotational center eccentric to that of the casing on a tool supporting means so that the casing engages the spindle through gears. CONSTITUTION:A casing 17 is fixed to a turret 2 by driving a disk brake 20 so that a rotary tool spindle 16 is rotatably driven through a transmission 23, gears 11c, 12a, 13a and 16a by a drive motor 9 to work a workpiece with a tool 15. When the disk brake 20 is released by an electromagnetic clutch 21 and the motor 9 is rotated with low speed, the rotary tool spindle 16 is rotated with low speed and the casing 17 is also rotated through said clutch 21 by the gear 12a. The rotational center CT2 of tool spindle 16 is eccentric to the rotational center CT1 of casing 17 by SF so that the center CT2, when rotated by 90 deg., is shifted by SF in the direction of arrow C. This displacement is controllably detected by a position coder 22. Thus, the diameter of the rotary tool spindle can be enlarged to enable heavy cut with large torque.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an eccentric tool rest that can move a rotary tool in the Y-axis direction in a lathe or the like having a milling function.

(b), Prior Art In lathes having a milling function, when machining keyways and other parts, it is often necessary to move the rotary tool in the Y direction with respect to the spindle axis.

Previously, in response to requests for seeds,
In 03, a rotary tool is rotatably provided in the casing in a manner eccentric to the rotation center of the casing, and when the rotary tool is moved in the Y-axis direction, the casing is rotated together with the rotary tool, and A structure has been proposed in which rotational force is transmitted to a rotating tool from the center of the casing via a gear train.

(C) 0 Problems to be Solved by the Invention However, in such a structure, it is necessary to arrange the main shaft of the rotary tool, a gear train for transmitting driving force thereto, a drive shaft, etc. within the casing. Therefore, the diameter of the main shaft of the rotary tool is significantly smaller than the diameter of the casing because the main shaft is located between the drive shaft located at the center of rotation of the casing and the inner wall of the casing. Increasing the diameter of the tool spindle for heavy cutting requires a significant increase in the casing diameter. This not only becomes large and inconvenient as a mechanism to be disposed on the turret, but also limits the arrangement of other tools, resulting in the inconvenience of impeding improvement in the performance of the turret.

In order to eliminate the above-mentioned drawbacks, the present invention aims to provide an eccentric tool rest in which the diameter of the main shaft of a rotary tool can be made relatively thick within the casing with respect to the diameter of the casing. This is the purpose.

(d) Means for solving the zero problem, that is, the present invention provides a tool supporting means (2) with a casing (1).
7) is provided so as to be able to freely rotate and hold the casing (1).
7) rotatably supports a rotary tool main shaft (16) so as to have a rotation center (Cr2) eccentric to the rotation center (CTI) of the casing (17), and furthermore, a gear is attached to the casing (17). (13) is rotatably supported, an internal gear (13a) is formed on the gear, and the internal gear (13a)
and the rotary tool spindle (16).
They are configured to mesh with each other through a gear (16a) provided in the.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r (e) below
The same applies to the column "0 effect".

(e) 0 effect With the above-described configuration, the present invention can provide Y of the rotary tool (15).
Axial movement is performed between the casing (17) and the rotating tool spindle (
The rotary tool (16) is rotated synchronously, and during machining, the gear (13) is rotated while the casing (17) is held fixed.
5) is performed by rotating relative to the fixed casing (17).

(f), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a diagram showing an embodiment of the eccentric tool post according to the present invention, Fig. 2 is a diagram showing the engagement mode between the gear mounted on the rotary tool main shaft and the internal gear for driving the main shaft. It is an arrow view.

As shown in FIG. 1, the wound tool post 1 has a turret 2, and the turret 2 is supported rotatably in the directions of arrows A and B about a shaft 2a.

An indexing gear 3 is fixed to the shaft 2a, and a turret! is mounted at an appropriate position on the side surface of the indexing gear 3. - A plurality of stop position indexing dogs 3a are provided on the same circumference. A proximity sensor 5 is provided at a position facing the dog 3a, and a gear 6a fixed to one end of a shaft 6 meshes with the indexing gear 3. A gear 6b is fixed to the other end of the shaft 6, and an electromagnetic clutch 7 is attached to the gear 6b.
The gears 7a constituting the two mesh with each other. The electromagnetic clutch 7 is provided with a shaft 7b, and by driving and releasing the drive of the electromagnetic clutch 7, rotation of the shaft 7b can be selectively transmitted to the gear 7a.

A gear 7C is provided at the tip of the shaft 7b, and the gear 7c meshes with a gear 9a attached to the output shaft of the drive motor 9. Further, the sliding shaft 10 constituting the transmission mechanism 23 is located at the arrow 1 on the shaft 7b. Gears 10a and 10b with different numbers of teeth are engaged with each other so as to slide only in the J direction.
is fixed. At a position facing the gear 10a110b, gears 1ja, 1 having different numbers of teeth are fixed to the shaft 11.
1b is provided so as to be able to selectively mesh with the gears 10a and 10b, and the gear 11 is provided at the other end of the shaft 11.
c is provided. A gear 12a formed on a hollow shaft 12 meshes with the gear 11C, and the shaft 12 is connected to the shaft 2a.
is rotatably supported.

A bevel gear 12b is provided at the end of the shaft 12 inside the turret 2, and the bevel gear 12b meshes with the bevel gear 13. An internal gear 13a is formed on the bevel gear 13, and a gear 16a formed at the right end in the figure of a rotary tool main shaft 16 on which the rotary tool 15 is detachably mounted is meshed with the internal gear 13a. Note that the gears 13a and 16a are
As shown in FIG. 2, the pitch circle PC2 of the gear 16m is formed to be slightly smaller than the pitch circle PCI of the gear 13a (that is, the number of teeth of the gear 13a is
).

The rotary tool main shaft 16 is rotatably supported by a casing 17 that is rotatably supported with respect to the turret 2.
Furthermore, the support mode is based on the rotation center CT1 of the casing 17.
The rotation center CT2 of the rotary tool main shaft 16 is supported eccentrically by an eccentric amount SF. Further, the aforementioned bevel gear 13 is rotatably supported by the casing 17, and furthermore, a bevel gear 17a is fixed to the casing 17. A bevel gear 19a fixed to one end of the shaft 19 meshes with the bevel gear 17a, and the shaft 19 is connected to the shaft 12.
It is rotatably supported by penetrating the inside.

A gear 19b is provided at the other end of the shaft 19.
A disc brake 20 is provided on the gear 9b in a manner capable of restraining rotation of the gear 19b.

The gear 19b meshes with the gear 21a of the electromagnetic clutch 21, and the electromagnetic clutch 21 is provided with a shaft 21b.
The rotation of 1b can be selectively transmitted to the gear 21a side. A position coder 22 and a gear 21c are provided at the tip of the shaft 21b, and the gear 21c is similar to the gear 1 described above.
It meshes with a gear 12c formed on 2a.

Since the eccentric tool rest 1 has the above-described configuration, when performing normal cutting using the rotary tool 15, that is, cutting that does not involve movement in the directions of arrows C and D in FIG. is driven to restrain the rotation of the shaft 19 via the gear 19b.

Then, the casing 1 passes through the bevel gears 19a and 17a.
7 relative to the turret 2 is also restrained, and the casing 1
7 is fixed to the turret 2.

As a result, the rotary tool main shaft 16 inside the casing 17 is
Normal machining position (for example, gears 13a and 16a are in the second
At the meshing position at point P1 in the figure, that is, at point P1, the rotation center CT1 of the casing 17 and the rotation center CT2 of the rotary tool main shaft 16 are at the same coordinate position in the Y-axis direction. )
is maintained.

In this state, when the drive motor 9 is rotated, the gear 9a
, 7c, transmission mechanism 23, shaft 11, gear 11 c, 12
a, shaft 12, bevel gears 12b, 13, internal gear 13a1
The rotary tool main shaft 16 is rotationally driven within a fixedly held casing 17 via a gear 16a, and the rotary tool main shaft 16
The rotary tool 15 attached to the machine is also rotated to perform predetermined machining. At this time, since the electromagnetic clutch 7 is in a non-driving state, the connection between the shaft 7b and the gear 7a is disconnected 9, so even if the shaft 7b is rotated by the drive motor 9, the shaft 6 does not rotate. As a result, the turret 2 does not rotate, and processing by the rotary tool 15 is performed smoothly.

Next, when moving the rotary tool 15 from the normal machining position in the vertical direction in FIG. Connect, and then release the drive of the disc brake 20 to enable rotation of the gear 19b1 and therefore the shaft 19.

Therefore, when the drive motor 9 is rotated at a low speed, the rotation of the drive motor 9 is transmitted to the gear 12a via the transmission mechanism 23, and as described above, the rotary tool main shaft 16 is rotated at a low speed in a predetermined direction. Also, when the gear 12a rotates, the gears 12c, 21cS electromagnetic clutch 21, gear 21a,
19b, the casing 17 is also rotated at low speed through the shaft 19 and bevel gears 19a and 17a in the same direction as the rotating direction of the rotary tool main shaft 16, and also at the same rotational angular velocity due to the ratio of the number of teeth in the gear train. do. Then, the rotary tool main shaft 16 and the casing 17 rotate relative to the turret 2 in an integrated manner. Since the rotation center CT2 of the rotary tool spindle 16 is offset by SF with respect to the rotation center CTI of the casing 17, the rotation center CT2 of the rotary tool spindle 16 is eccentric due to the integral rotation of the casing 17 and the rotation tool spindle 16. As shown by the dotted line in Figure 2, it moves in a circle with a diameter of 2SF centered around the rotation center CT1.

That is, the casing 17 and the rotary tool spindle 16 are in the normal machining position (corresponding to position P1 in FIG. 2),
Rotate 90 degrees in the direction of arrow E in Figure 2, and gears 13a and 16m
When the meshing position moves from the normal processing position P1 to P2, the rotation center CT2 moves in the direction of arrow C by a distance glsF. Furthermore, the casing 17 and the rotary tool spindle 16 rotate 90 degrees in the direction of arrow F in FIG. Then, the rotation center CT2 moves in the direction of the arrow by the distance MSF.

Therefore, by rotating the casing 17 and the rotary tool spindle 16 in the direction of arrow E or F within a range of ±90°, the center of rotation CT2 moves in the direction of arrows C and D within a range of distance SF. The rotary tool 15 can also move in the Y-axis direction within a range of distance SF. The amount of movement of the rotary tool spindle 16 in the Y-axis direction is determined by the position coder 22.
This can be detected by detecting the rotation angle of the shaft 21b, so by controlling the rotation angle of the drive motor 9 while monitoring the output of the position coder 22, the rotary tool main shaft 16 can be placed in any position. Settings can be moved.

In this way, when the rotary tool 15 has moved a predetermined distance in the direction of the gIIY axis, the drive of the electromagnetic clarifier 21 is released, and
The connection between the shaft 21b and 19 is cut off, and the disc brake 20 is driven to restrain the rotation of the shaft 19. Then, the rotation of the casing 17 with respect to the turret 2 is restrained, so that the rotary tool main shaft 16 is held within the casing 17 while being moved a predetermined distance in the Y-axis direction. When the drive motor 9 is rotated in the state B, the rotary tool main shaft 16 is rotationally driven together with the rotary tool 15 via the speed change mechanism 23 and the shafts 11 and 12, as in normal machining, and the predetermined machining can be performed. I can do it.

Note that when the rotary tool main shaft 16 moves in the Y-axis direction, the center of the rotary tool 15 is in the Z-axis direction, as shown by arrows G and H in FIG.
However, since the amount of movement corresponds to the amount of Y-axis eccentricity, it can be appropriately corrected on the NC device side.

In addition, when rotating the turret 2 when exchanging tools, etc., the electromagnetic clutch 7 is driven to connect the shaft 7b and the gear 7a.
At the same time, the transmission mechanism 23 is brought into a neutral state, and the connection between the shafts 7b and 11 is cut off. In this state, the drive motor 9
When rotated, the rotation of the drive motor 9 is transmitted to the turret 2 via the shaft 7b, the gears 7a and 6b1, the shaft 6, and the gears 6a and 3, causing the turret l-2 to rotate around the shaft 2a.

The index of the turret 2 is determined by the dock 3 provided on the gear 3.
This is done using a known method using a and proximity sensor 5.

(g) 0 Effects of the Invention As explained above, according to the present invention, the tool support means such as the turret 2 is provided, and the tool support means includes the casing 1.
A rotary tool main shaft 16 capable of holding a rotary tool 15 is rotatably supported so that the casing 17 has a rotation center CT2 eccentric to the rotation center CTI of the casing 17. Further, a gear 13 is rotatably supported in the casing 17, an internal gear 13a is formed on the gear, and the internal gear 13a and the rotary tool main shaft 16 are connected to a gear 16a provided on the rotary tool main shaft 16.
Since the rotary tool 15 is configured to mesh with each other through the casing 17 and the rotary tool main shaft 16, movement of the rotary tool 15 in the Y-axis direction is possible by rotating the casing 17 and the rotary tool main shaft 16 synchronously.
This is possible by rotating the gear 13 while keeping the casing 17 fixed. Furthermore, the transmission of the rotational force to the rotary tool main shaft 16 is carried out by the gear 1 pivotally supported on the casing 17.
3 and the internal gear 13a formed on the gear 13, there is no need to arrange a gear train or the like for driving the rotary tool spindle 16 inside the casing 17, and the diameter of the rotary tool spindle 16 is The rotary tool spindle 1 uses a compact casing 17, which can be relatively large in diameter compared to the diameter of the casing 17, and can also perform heavy cutting with large l/lux.
This can be done using 6. Further, since the casing 17 is downsized, the arrangement of other tools on the turret 2 is not restricted, and an extremely functional turret 2 can be provided.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the eccentric tool post according to the present invention, and Fig. 2 is a diagram showing the engagement mode between the gear mounted on the rotary tool main shaft and the internal gear for driving the main shaft. It is an arrow view. 1... Eccentric tool rest 2... Tool support means (turret) 13.16a.
・Gear 13a...Internal gear 15...Rotary tool 16...Rotary tool spindle 17...Casing CTI, Cr2...Rotation center Applicant Yamazaki Mazatuku Co., Ltd. Agent: Patent attorney Phase 1) Shinji (and 1 other person)

Claims (1)

[Scope of Claims] A tool rest having a tool support means, and a rotary tool spindle rotatably provided to which a rotary tool can be mounted, wherein a casing is rotatably held on the tool support means and stopped. furthermore, the casing rotatably supports the rotary tool main shaft so that the casing has a rotation center eccentric with respect to the rotation center of the casing, the gear is rotatably supported in the casing, and the gear has an internal gear. An eccentric tool rest comprising: the internal gear and the rotary tool main shaft being engaged with each other via a gear provided on the rotary tool main shaft.