JPH05245710A - Driven side support holder - Google Patents

Abstract

PURPOSE:To enable working, together with other multiworking, of two opposed inverted worked portions on the axial line, in a working tool composed of two opposed working centers each equipped with an ATC device, by causing a spring, used to forwardly urge a driven-side holding shaft, to be interposed between the driven-side holding shaft and a supporter. CONSTITUTION:The difference in number of rotations between a drive side support holder 40 and a driven side support holder 50 which are respectively rotated in a condition wherein a cutter 30 is clamped therebetween by a spring is absorbed by axial movements of a supporter 54 and a driven-side holding shaft 55 relative to a main holder body 52. Consequently, in a machine tool composed of two opposed working centers each equipped with an ATC device, two inverted worked portions which oppose each other on an axial line can be reliably worked without being followed by any inconvenience.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driven side support holder for a backing cutter used in a machine tool having two machining centers with an ATC device opposed to each other.

[0002]

2. Description of the Related Art Conventionally, when performing backing processing on an FMS processing line, for example, when it is desired to process two backing processing parts that are axially opposed to each other in a diff case of an automobile, one station on the processing line is required. It was supported by installing a machine dedicated to backing. However, providing a dedicated backing machine in the FMS processing line in the factory has a problem such as an increase in the processing line area. Therefore, it has been desired to perform the backlining processing together with other various types of processing with a machine tool that is formed by facing two machining centers with an ATC device in an FMS processing line instead of the dedicated backing processing machine. ..

[0003]

When attempting to perform backlining processing by such a machine tool, a support holder of a backing processing cutter is fitted to each main spindle of each machining center by an ATC device, and By axial movement,
The backing cutter supplied to two backing parts facing each other on the axis of the work is sandwiched from both sides, and the cutter is rotated by the rotation drive of one main spindle or both main spindles, in the axial direction of both main spindles. Fast-forward the rotating cutter by moving
It suffices to carry out cutting feed to machine the opposite machined surfaces. However, when attempting to perform such a method, it is practically impossible for the two opposing machining centers to rotate the two spindles at the same time in perfect synchronization. The cutter held by cannot be rotated smoothly. Further, if the cutter is driven only by one of the machining centers, the spindle of the other machining center must be swung around, which undesirably increases the load on the spindle motor of the driven machining center. Further, the fast-forward incision feed of the backing cutter is performed by the axial movement of both main shafts by the drive motors, respectively. In the same manner as above, the two axial feed motors are driven in synchronization. It is practically impossible to do so, and the feed amount of both spindles may be different.At this time, for example, when the feed amount of one holder in the axial front direction is smaller than the feed amount of the other axial rear direction, There has been a problem that the holding force of the backing processing cutter by each holder of the main shaft is lost and processing cannot be performed.

In view of the above, an object of the present invention is to ensure that, in a machine tool having two machining centers with an ATC device opposed to each other, the two backing machined parts facing each other on the axis along with the other machining can be reliably operated. The purpose of the present invention is to provide a support holder for a backing cutter for processing.

[0005]

In order to solve the above problems, the present invention provides a support holder for a backing cutter used in a machine tool having two machining centers with an ATC device opposed to each other. Support body is rotatably supported on a holder body that can be inserted into and removed from the main shaft of one machining center, and seat machining is performed between the support body and a drive side support holder fitted to the main shaft of the other machining center. A driven-side holding shaft that holds the cutting cutter is movably supported in the axial direction, and a spring that urges the driven-side holding shaft forward is interposed between the driven-side holding shaft and the support body. To do.

[0006]

[Operation] When the backing is machined, the driving side and driven side support holders are fitted to the main axes of the respective machining centers by the ATC device, and the driven side holding shafts of the driving side support holder and the driven side support holder are axially moved by both spindles. Hold the backing processing cutter between and and rotate the cutter by positively driving both spindles. At this time, the drive motors that rotate both spindles do not rotate in synchronization and a difference in rotation speed occurs between the holders.However, in the driven-side support holder, only the difference in rotation speed between the holders supports the holder body. The non-rotatable driven-side holding shaft rotates relative to the body and this support, and the driven-side holding shaft and the drive-side support holder rotate around while holding the cutter between them.

Further, the cutter, which is clamped and rotated between the drive side support holder and the driven side holding shaft, is axially fast-fed and cut by the axial movement of both the main shafts to process the work. At this time, the drive motors that move both spindles in the axial direction are not rotationally driven in synchronism, and an axial feed amount difference occurs between both holders.However, in the driven side support holder, only the axial feed amount difference between both holders is generated. The driven-side holding shaft moves in the axial direction relative to the support, and the driven-side holding shaft and the drive-side support holder move in the axial direction with the same feed amount while holding the cutter with the spring force. Machining of two backing machined parts facing each other on the axis is performed by forward and reverse fast-feeding and cutting-feeding of this cutter.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A machine tool 3 in which two machining centers 2 equipped with an ATC device 1 are opposed to each other will be described with reference to FIG. A table 6 is movable on the base 4 of the machine tool 3 in the direction of the main axis via a ball screw (not shown) by the action of a drive motor 5, and a drive motor 7 acts on the table 6 by a action. The column is movable in the left-right direction (the direction perpendicular to the drawing). A spindle head 9 is vertically movable in the column 8 by the action of a drive motor 10. The spindle 12 provided on the spindle head 9 is rotatable by the action of the drive motor 13. Further, the well-known ATC device 1 provided on the side of the spindle head 9 is
Various tool holders are provided in the tool magazine, and one of these tool holders and the tool holder mounted on the spindle 12 are directly exchanged by moving the spindle head 9. Two machining centers 2 are provided on the base 4.
The work table 15 is fixed between the two, and the work W, which is a differential case of automobile parts, is attached to the L-shaped jig 16 screwed onto the work table 15. This work W
As shown in FIGS. 2 and 3, a pair of opposed side walls 18 extend from the front surface of the disk portion 17 screwed to the jig 16, and the front ends of the side walls 18, 18 are connected. This work W
Has a back seat processing portion 20 on the respective facing surfaces of the pair of side walls 18, and the side wall 18 holds the back seat processing portion 20 and corresponding portions thereof respectively for holding drive side and driven side support holders 40 and 50 to be described later. An insertion hole 21 into which the shafts 43 and 55 can be inserted is formed.

Next, a back seat processing cutter 30, which will be described later, is provided above the processing table 15 and has a standby position A and a processing position B.
The lift device 22 that moves up and down will be described.
A cylinder 25 is mounted on a mounting plate 24 fixed to the support column 23 on the base 4. This cylinder 2
A pair of upper and lower guide bars 27 is provided on the concave bracket 26 fixed to the tip of the piston rod 25a of No. 5, and a support arm 28 is supported on the guide bar 27 so as to be axially movable. As shown in FIGS.
Is loosely fitted into the support groove 31 formed on the outer peripheral surface of the cutter 30
Is rotatably supported. The cutter 30 has both side surfaces formed into a spherical surface to which a cutting tool 31 is attached, and serves as a spherical surface counterbore processing cutter. A through hole 34 that is open to both spherical surfaces is penetrated through the center of the cutter 30, and both end portions of the through hole 34 have respective holding shafts 43 and 5 of drive side and driven side support holders 40 and 50, which will be described later.
The engaging taper surfaces 35 and 36 that engage with the distal end portion of No. 5 are formed, and the portion continuous with the driving side engaging taper surface 35 is formed into a square surface 37.

Next, the drive side support holder 40 will be described. A cylindrical holder body 4 having a taper portion 41 that can be inserted into and removed from the taper hole of the spindle 12 of the machining center 2.
2, the large-diameter portion 43a of the drive-side holding shaft 43 has the screw 45
It is fixed by. The tip of the drive-side holding shaft 43 has an engaging tapered surface 35 and a square surface 37 of the cutter 30.
The centering pin 48 is formed on the front surface of the rhombus portion 47 so as to project therefrom.

Next, an embodiment of the driven side support holder 50 of the present invention will be described. The drive side support holder 4
In the same manner as 0, a cylindrical holder main body 52 having a tapered portion 51 that can be inserted into and removed from the tapered hole of the main shaft 12 of the machining center 2 is provided with a cylindrical support body 54 via a bearing 53.
Is rotatably supported. In this support 54,
The driven side holding shaft 55 is supported slidably in the axial direction, and the driven side holding shaft 55 is supported by a key 57 attached to the large diameter portion 55a of the driven side holding shaft 55 and a key groove 58 formed in the support shaft 54. It cannot rotate with respect to the support body 54. Further, the large diameter portion 55 of the support body 54 and the driven side holding shaft 55.
A disc spring 59 that biases the driven-side holding shaft 55 forward with respect to the support body 54 and holds the cutter 30 is interposed between the disc spring 59 and a. A central hole 60 formed in the rear portion of the support 54
An abutment ring 61 is screwed to the rear portion of the driven side holding shaft 55 extending through the support body 54 rearward through the abutment ring 61 when the driven side holding shaft 55 does not hold the cutter 30.
Is in contact with the rear surface of the support body 54 to prevent the driven-side holding shaft 55 from popping out. As will be described later, the driven-side holding shaft 55 and the drive-side holding shaft 43 form the cutter 30. When holding the driven side holding shaft 55, the driven side holding shaft 55 is retracted with respect to the support body 54 against the biasing force of the disc spring 59 by controlling the axial position of the driven side main shaft 12.
A gap S is formed between the contact ring 61 and the rear surface of the support body 54, and the cutter 30 is held by the spring force of the disc spring 59. The gap S is such that the difference in the amount of axial movement of the two facing machining centers 2 during processing can be absorbed, and while the gap S is present,
The spring force of the disc spring 59 is set so that the cutter 30 can be sufficiently held. Further, the tip end of the driven side holding shaft 55 is formed on an inclined portion 62 that engages with the engagement tapered surface 36 of the cutter 30, and the front end surface of the inclined portion 62 has a centering pin for the drive side holding shaft 43. An engagement hole 63 that can be engaged with and disengaged from 48 is provided.

Next, the backing processing operation will be described. When the backing is processed after finishing the multi-step processing by the two machining centers 2, the ATC device 1 of each machining center 2
The tool holder used for pre-machining is pulled out from each spindle 12 by the above, and the drive side support holder 40 is attached to the spindle 12 of one machining center 2 and the other machining center 2 is attached to the spindle 12.
A driven-side support holder 50 is fitted to the main shaft 12 of. The back seat processing cutter 30 positioned at the standby position A as shown in FIG. 1 due to the protrusion of the piston rod 25a of the lift device 22 reaches the processing position B between the side walls 18 of the work W as shown in FIGS. Be lowered. At this time, the spherical surface of the cutter 30 on which the blade is attached faces the backing processing portion 20 of the work W, respectively.

Then, the spindle 12 of each machining center 2
Moves in the three axial directions by the action of the drive motors 5, 7, and 10 to hold the respective holding shafts 43, 55 of the holders 40, 50.
Moves toward the backing cutter 30 through the insertion hole 21 of the side wall 18 of the work W, and the inclined portions 46 and 62 of the drive-side and driven-side holding shafts 43 and 55 engage with the cutter 30 respectively. The cutter 30 is engaged with the tapered surfaces 35 and 36, and is held by the holding shafts 43 and 55 by the spring force of the disc spring 59. When the cutter 30 is held, the diamond-shaped portion 47 of the drive-side holding shaft 43 is
The rotation of the drive side support holder 40 is surely transmitted to the cutter 30, and the centering pin 48 of the drive side holding shaft 43 is engaged with the driven side holding shaft 55. The cutter 30 is fitted in the centering member 63 and the cutter 30 is centered. Further, in the driven side support holder 50, a gap S is formed between the rear surface of the support body 54 and the contact ring 61. After that, while holding the cutter 30 in a held state, both main shafts 12 are driven by the action of the drive motors 13 and 13 to rotate the cutter 30 together with the drive side and driven side support holders 40 and 50. At this time, each drive motor 13,1
Since 3 cannot rotate in synchronism, a difference in the number of rotations occurs between the holders 40 and 50. This difference in the number of rotations is transmitted via the bearing 53 of the driven side support holder 50 to the support 54.
The non-rotatable driven side holding shaft 55 is absorbed by the support body 54 by rotating relative to the holder body 52. Therefore, the drive-side and driven-side holding shafts 43 and 55 smoothly circulate while holding the cutter 30.

After that, the main spindle 12 is moved in the axial direction by the action of the drive motors 5 and 5 while keeping the holding rotation state of the cutter 30, and the drive side and driven side support holders 40,
Along with 50, the cutter 30 is fast-forward cut and fed in the axial direction to process one backing processing portion 20 of the work W. At this time, since the drive motors 5 and 5 cannot rotate in synchronization with each other, a difference occurs in the axial feed amount between the holders 40 and 50. However, this axial feed amount difference is caused by the driven side support holder 50.
In the holder main body 52 and the holder main body 52, the driven side holding shaft 55 is absorbed by being axially moved with respect to the support body 54 which is immovable in the axial direction. The gap S is a sufficient amount to absorb the difference in the axial movement amount, and the gap S
Since the cutter holding force by the disc spring 59 is sufficiently set during the period, the holding of the cutter 30 between the drive-side and driven-side holding shafts 43 and 55 does not deviate.
In this way, when the processing of the one backseat processing portion 30 is completed, the rotations of the respective drive motors 5 and 5 are reversed to perform the fast forward cutting feed to the other backseat processing portion 20 to end the backseat processing. To do. When the cutter 20 is moved in the axial direction, the support arm 28 that rotatably supports the cutter 30 is guided by the guide bar 27 and moves in the axial direction.

In this embodiment, the drive-side and driven-side support holders 40 and 50 are positively driven by the drive motors 13 and 13, so that only a slight difference in rotational speed between the drive motors 13 and 13 is detected. Since it is absorbed by the bearing 53, the rotation resistance due to the lubricating grease in the bearing 53 is small, and the cutter 30 can be rotated more smoothly, but only the drive side support holder 40 may be rotationally driven. ..

[0016]

As described above, in the driven side support holder of the present invention, the difference in the number of rotations when the both holders are rotated while the cutter is held by the spring between the drive side and the driven side support holders, This is absorbed by the relative rotation of the support body and the driven side holding shaft that are mounted on the holder body, and the difference in the feed amount when both holders are fed in the axial direction is the relative axial direction of the driven side holding shaft to the support body. Since it is absorbed by the movement, it is possible to surely machine the two backing machined portions facing each other on the axis line without any trouble with a machine tool that is formed by opposing two machining centers with an ATC device. In addition, A
Since a machining center equipped with a TC device can also perform many other processes, space can be saved in the FMS line compared to the case where a dedicated backing machine is provided.

[Brief description of drawings]

FIG. 1 is a front view of a machine tool of this embodiment.

FIG. 2 is a cross-sectional view of drive-side and driven-side support holders.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

1 ATC device, 2 machining center, 3 machine tool, 30 backing cutter, 40 driving side support holder, 50 driven side support holder, 52 holder body, 54 support body, 55 driven side holding shaft, 5
9 Belleville

Claims (1)

[Claims] 1. A support holder for a backing cutter used in a machine tool comprising two machining centers with an ATC device facing each other, the support holder being supported by a holder body that can be fitted into and removed from a spindle of one of the machining centers. The body is rotatably supported, and the driven-side holding shaft that holds the cutter for seat machining between it and the drive-side support holder that is fitted to the main shaft of the other machining center is axially movably supported on this support. Then, a driven side support holder formed by interposing a spring for biasing the driven side holding shaft to the front between the driven side holding shaft and the support body.