JPH039956Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a work clamping device for a pallet exchange device.

Conventional technology Conventionally, when a jig fixed on a pallet has a clamp cylinder, for example, a tombstone jig has a clamp cylinder, and in order to fix a workpiece to this tombstone jig, the tombstone jig has a clamp cylinder. The attached clamp cylinder was actuated by pressure fluid from a pressure accumulator or the like attached to the pallet itself to clamp the workpiece. Further, by integrating the clamp cylinder with the pallet in this manner, the clamp is held even when the pallet is indexed and rotated on the indexing table.

Problems to be solved by the invention As mentioned above, when the pallet itself is equipped with a pressure accumulator, etc., the pallet itself becomes large.
An indexing table is placed in front of the main shaft head that moves horizontally and vertically, and a rotating moving body that rotatably supports a plurality of pallets is rotatably supported. In a pallet exchange device in which other pallets are in a standby position when the pallet is on the table so that the pallet does not come off the rotating moving body, the use of the pallet prevents the overall compactness of the pallet exchange device. There was a problem.

Means for Solving the Problems The present invention moves a rotating moving body that rotatably supports pallets so that when one pallet is positioned on the indexing table, the other pallets are in the standby position. In the pallet exchange device, supports are arranged in the rotating moving body corresponding to the respective pallets, and each of these supports is provided with a rotary joint case having a first supply/discharge port for supplying and discharging pressurized fluid. fixed,
These rotary joint cases rotatably support a rotating shaft on the axis of rotation of the pallet, and the rotating shaft is provided with a second supply/discharge port, and this second supply/discharge port is connected to the first supply/discharge port.
It is characterized by communicating with the supply/discharge port.

Operation According to the above configuration, when a tombstone jig or the like equipped with a pressure fluid-operated clamp cylinder is mounted on a pallet and a workpiece is attached to the tombstone, the tombstone jig is connected in advance to the pressure fluid supply/discharge port of the tombstone jig. By connecting the second supply/discharge port of the provided rotating shaft with piping, pressurized fluid is smoothly supplied to the fluid pressure clamp cylinder of the tombstone jig even when the pallet is indexed on the indexing table. .

Embodiment As shown in FIGS. 1 to 3, a spindle 2 is rotatably supported by a spindle head 2A in a column 1.
A cutter 3 is attached to this spindle 2. The column 1 is movable back and forth and left and right with respect to the bed body 4 of the machine tool, and the spindle head 2A is movable vertically with respect to the column 1. In this bed main body 4, an indexing base 7 of a known indexing device 5, such as that disclosed in Japanese Patent Application Laid-open No. 53-124389, is fixedly installed in front of the cutter 3, and an indexing table 6 is mounted on the indexing base 7 of a known indexing device 5, such as that disclosed in Japanese Patent Application Laid-open No. 53-124389. It is indexed at a predetermined angle in a horizontal plane by a rack and pinion, and is clamped to the indexing base 7 at that position by a clamping device (not shown). This bed body 4
A bracket 8 made of welded plate material is fixed to the front side of the indexing device 5 with bolts 9, and a base 10 is fixed to the front side of the bracket 8 while being positioned in the vertical direction with a key 11. A pivot shaft 12 is supported on the base 10 by sliding bearings 13, 13 so as to be rotatable and movable up and down. As shown in FIG. 4, two sets of 90 degree fan-shaped grooves 51a to 51d are formed on the circumference of the pivot shaft 12, facing each other with vertically shifted phases, and these fan-shaped grooves 51a to 51d are They communicate with communication holes 52a to 52d opened on the upper surface of the pivot shaft 12, respectively. The base 10 is provided with the fan-shaped groove 51 so that pressure oil can be supplied even when the pivot shaft 12 turns 90 degrees as described later.
Supply/discharge ports 53a to 53d opening to a to 51d are drilled, and the respective supply/discharge holes 53a, 53b, and 53
c and 53d are a pair of three-position solenoid operated valves 54A and 54 of the pressure port block, respectively.
Connected to B. A rotating moving body 14 is fixed to the upper end of this rotating shaft 12. This rotating moving body 14 has an L-shaped rotating plate 14 opened at right angles.
a, and support arms 14b, 14b fixed to opposite ends of the L-shaped portion, and a pallet support portion 15 is formed by the two opposing support arms 14b, 14b. When one of the pallet supporting parts 15 is located above the indexing device 5, the other is located at a standby position S1, S which is 90 degrees apart from the above.
It is as shown in 2. The support arm 14b, 1
4b, an arc-shaped presser foot 16 is attached to the pallets 18A, 1
It is sandwiched between upper and lower flanges 18a and 18b of pallet 8B (hereinafter sometimes referred to as pallet 18), and is configured to swing around pin 17 by a pin 17, so that the lower flange 18b of pallet 18 can be pressed. It is set as. In addition, support arms 14b, 14
Protrusions 19 and 20 are provided on the upper surface of the upper surface of the upper surface of the upper flange 18a of the pallet 18.
A positioning pin 21 that fits into the flange 8c is fixed to the upper surface of the other protrusion 20, and a pad 22 that receives the lower surface of the upper flange 18a is fixed to the upper surface of the other protrusion 20, respectively. The diameter of the intermediate portion 18d of the pallet 18 is set to be slightly smaller than the arc diameter formed by the inner peripheral surface of the presser foot 16 of the opposing support arms 14b, 14b, and
The vertical relationship between the dimension between the upper and lower flanges 18a and 18b and the support arm 14b is set so that the positioning pin 21 is removed from the positioning hole 18c when the presser foot 16 comes into contact with the lower flange 18b.
Therefore, when the positioning pin 21 is removed from the positioning hole 18c of the pallet 18, the pallet 18 can rotate relative to the pallet support part 15. Palette 1
Positioning holes 2 are provided on the lower surface of the lower flange 18b of 8.
3a and 23b are drilled at one location each, and a diamond pin 24 and a round pin 25 that fit into the positioning holes 23a and 23b, and a plurality of parts 26 that receive the lower surface of the lower flange 18b of the pallet 18. Positioning plate 2 illustrated as
7 is fixed to the upper surface of the indexing table 6, and when the positioning holes 23a, 23b of the pallet 18 are engaged with the diamond pins 24 and the round pins 25, the pallet 18 becomes integral with the indexing table 6.

The moving device for this rotating moving body 14 is a rotating plate 14.
The cam groove 28 formed on the lower surface of a and the output shaft 29
A swing motor 30 that rotates 90 degrees horizontally and a swing arm 31 connected to the output shaft 29 of this motor 30.
A Geneva mechanism consisting of a swing arm 31
A cam follower 32 that slides in the cam groove 28 is rotatably supported at the tip, and by switching the swinging arm 31 between the A position and the B position, the positions of the two pallets 18A and 18B can be adjusted by the indexing device. It is designed to move upward and to standby positions S1 and S2. Further, blocks 33, 33 are fixed to the back surface of the rotating plate 14a along the longitudinal edge of the cam groove 28, and the cam follower 31 is removed from the cam groove 28 when the rotating plate 14a is raised by a vertical movement device to be described later. I have made sure that there is no such thing.

Next, the vertical movement device will be explained. The vertical movement device includes a piston rod 3 vertically below the pivot shaft 12.
A cylinder 35 is connected to the lower surface of the base 10 so that the piston rod 34 is located at the lower end of the piston rod 34, and a connecting shaft 37 is connected to the tip of the piston rod 34 via a bearing 36, so that the connecting shaft 37 is fixed to the lower end of the pivot shaft 12. ,
Furthermore, a ring 38 is screwed onto the lower side of the connecting shaft 37 into the piston rod 34, and a three-position pressure port block is located between the nut 39 screwed on the outside of the ring 38 and the rod-side flange 35a of the cylinder 35. When the electromagnetic operation valve 40 is set to neutral and the hydraulic clamping force is released, the weight is almost balanced with the weight applied from above in the axial direction to the rotating moving body 14, the rotating shaft 12, etc., and the piston rod 34, so that no clamping force is generated due to these weights. A spring 43 is interposed therebetween.

Furthermore, on the upper surface of the base 10, there is a positioning bush 42 having an angle of 90 degrees, which engages with the positioning pin 41 on the back surface of the rotating plate 14a and positions the pallet support part 15 on the indexing table 6 and in the standby positions S1 and S2. It is attached in two places.

Next, the work clamp assist device will be explained. Supports 55A and 55B are fixed to the upper surface of the rotating moving body 14, and extend upward to extend above the two pallets 18A and 18B. The base portions 55C of the supports 55A and 55B are provided with piping portions 56a to 56d connected to the communicating holes 52a to 52d via O-rings. A rotary joint case 57 (FIG. 5) is fixed to the tips of the supports 55A and 55B, and this rotary joint case 57 is provided with a pair of first supply and discharge ports 58a and 58b for supplying and discharging pressurized fluid. There is. Further, the rotary joint case 57 is arranged so as to face the workpiece mounting surface of the pallet 18 and maintain a predetermined distance (corresponding to the mounting space of the workpiece or jig), and the pallet 18 is placed on the indexing table 6. Clamp cylinder 60 with a piston rod that moves axially on the axis of rotation of the pallet 18 when positioned
is supported to rotate around an axis as a rotation shaft. The cylinder body of this clamp cylinder 60 includes a cylinder tube 61 and a rod cover 6.
2. It is composed of a head cover 63 and a piston 6.
4 and the first supply/discharge port 58
a, 58b are communicated with each other through communication paths 65a, 65b. Communication path 65a of cylinder tube 61,
65b is further communicated with a pair of second supply/discharge ports 66a, 66b formed in the rod cover 62, respectively. The piston rod 59 has a flange 67 for attaching a presser foot for flat placement at its tip and a protrusion 68.
By changing the relative angular position of the locking ring 69 and the insertion hole 70 formed in the locking ring 69, which is rotatably mounted by 90 degrees, the piston rod is prevented from moving forward in the axial direction when it is in the retracted state. constitutes a means. Further, the rod cover 62 is provided with two anti-rotation grooves 76 for a tombstone jig, which will be described later. The first supply/discharge ports 58a, 58b have the piping ports 56a, 56b, 56c, 56, respectively.
d is connected to the piping. In this embodiment, an L-shaped guide 71 is provided on the flange 67 in order to clamp a flat workpiece placed horizontally on a pallet with the clamp cylinder 60 as shown in FIG.
The rotary joint case 57 has a notch for sandwiching the tip of the L-shaped guide 71 between the presser foot support 72 and the presser foot support 72.
A guide hole 73 (FIG. 5) into which a shaft 71a extending upward is slidably inserted is formed, and a guide groove 71b into which a pin 74 protruding from a locking ring 69 is inserted is formed in the shaft 71a. There is.

Next, the tombstone jig is attached to a jig body 8 that is vertically mounted on a substrate 80 that is fixed to the upper surface of the pallet 18.
The jig main body 81 is further provided with a number of clamp cylinders 84, and the work W is clamped to the jig main body 81 by the clamp cylinders 84. The jig main body 81 is provided with a conduit 85 for connecting the clamp cylinder 84, and a connection port 86 thereof is provided at the upper part of the jig main body 81. Such a tombstone jig is placed and fixed on the pallets 18A, 18B, and the pair of detents 87 fixed to the upper part of the tombstone jig are engaged with the detent groove 76 of the rod cover 69, and the second supply/discharge port is closed. 66a, 66b and the connection port 86 of the jig are connected with hose piping.
Furthermore, the piston rod 59 is positioned at the backward end,
The locking ring 69 is rotated by a predetermined angle and fixed, so that the protrusion 68 of the piston rod 59 comes into contact with the locking ring 69 and is prevented from moving in the axial direction with respect to the insertion hole 70 of the locking ring 69.

Now, while machining the workpiece on the pallet 18A, the workpiece W is positioned and attached to the tombstone jig on the pallet 18b using the positioning pins 82 and 83, and the solenoid operated valve 54B is set to the left position to supply pressure oil from the supply/discharge port 53b of the base 10. and clamp cylinder 8
4 is lowered to clamp the work W to the tombstone jig on the pallet 18B. On the other hand, when the machining of the work mounted on the tombstone on the pallet 18A is completed, the solenoid operated valve 40 is switched to the left position and the piston rod 34 is raised, which also raises the pallet support part 15 and positions the support arm 14b. Pin 21 is pallet 18A
The part 22 is brought into contact with the lower surface of the upper flange 18a of the pallet 18A, and the pallet 18A is disengaged from the round pin 25 and the diamond pin 24 of the indexing table 6, and
The positioning pin 41 is raised to a position where it is removed from the positioning bush 42. At this time, the detent 8
7 rises within the detent groove 76. Next, check this rising end using a limit switch (not shown),
The swing motor 30 is operated to swing the swing arm 31 from the A position to the B position. Swing arm 3
The first cam follower 32 moves along the blocks 33, 33 and the cam groove 28, rotates the rotating movable body 14 by 90 degrees, moves the pallet 18B in the standby position S1 above the index table 6, and moves the pallet 18A to the first They are simultaneously moved to the standby position S2 in the lower part of the figure. During this rotation, the pallets 18A and 18B have their upper flanges 18a aligned with the positioning holes 18c of the support arms 14b.
Because it is fitted into the positioning pin 21, it does not move relative to the pallet support section 15, and the workpiece W above it also does not move because it is clamped by the clamp cylinder 84. When this rotation is completed, the solenoid operated valve 40 is switched to the right position and the piston rod 34 is lowered, and the rotating moving body 14 is lowered accordingly, and the lower surface of the pallet 18B is positioned with the round pin 25 etc., and is moved onto the pallet 26. The presser foot 16 is placed on the pallet 18B and then lowered to release the positioning of the pallet 18B and the support arm 14b.
The upper surface of the lower flange 18b is pressed to clamp the pallet 18B onto the indexing table. In this way, the cutter 3 is moved to a predetermined position and machining is started, but when indexing and machining the workpiece, the solenoid operated valve 4 is opened with the cutter 3 away from the workpiece.
0 to neutral and release the hydraulic pallet clamp. Then, the weight of the rotating body 14 connected to the piston rod 34, the rotating shaft 12, etc. that presses the lower flange 18b of the pallet 18B is canceled out by the spring force of the spring 43, and the presser foot 16 pushes the lower flange 18b of the pallet 18B. , and the clamping force by the presser foot 16 is completely released.
Indexing can be performed using the indexing table 6. At this time, the tombstone jig is rotated, and the cylinder body 61A is also rotated together with it, but since a distributor is configured between the cylinder body 61A and the rotary joint case 57, the clamping state of the tombstone jig is Retained. While machining is performed in this way, pallet 1 at standby position S2
At 8A, the processed workpiece is removed and the unprocessed workpiece is mounted. In this way, the pallets 18A and 18B are alternately placed on the indexing table 6 and clamped, and the workpiece is processed.

In this example, the vertical movement device was constructed using a three-position electromagnetic operated valve and a spring, but the indexing table was rotated by hydraulic pressure to a position where the presser foot came into contact with the lower flange of the pallet. Good too. Further, the pallet is not limited to two pallets installed at 90 degree intervals, but may be two pallets installed at 180 degree intervals.

In this embodiment, the cylinder body of the clamp cylinder 60 is used as the rotation axis, but the cylinder function may be omitted.

Effects of the invention As described above, in this invention, an indexing table is arranged in front of the main spindle head that moves back and forth, left and right, and up and down, and a rotating moving body that rotatably supports a plurality of pallets is rotatably supported. In a pallet exchange device that is arranged so that when one pallet is on the indexing table due to the rotation of the revolving movable body, the other pallet is in a standby position and that the pallet does not come off the revolving movable body. Supports are arranged corresponding to each pallet, rotary joint cases each having a first supply/discharge port for supplying and discharging pressurized fluid are fixed to these supports, and pallets are attached to these rotary joint cases. A rotating shaft is rotatably supported on the center line of the rotating shaft, and a second supply/discharge port is provided on the pivot shaft, and the second supply/discharge port communicates with the first supply/discharge port. For example, when using a jig with a clamp cylinder such as a tombstone jig fixed to a pallet, simply connect the pressurized fluid supply/discharge port of the jig and the supply/discharge port of the pivot shaft to the jig. Piping can be easily done, pressure fluid can be smoothly supplied even when the pallet is indexed, and since the pallet itself does not have a pressure fluid accumulator as in the past, the pallet can be made smaller. This has the advantage that the pallet exchange device itself can be made smaller.

[Brief explanation of drawings]

Figure 1 is a plan view of the pallet exchange device, Figure 2 is a side view, Figure 3 is a cross-sectional view of Figure 1, Figure 4 is a cross-sectional view of Figure 3, and Figure 5 is a side view of Figure 2. −
6 is a cross-sectional view taken from FIG. 5, FIG. 7 is a cross-sectional view taken from FIG. 5, and FIG. 8 is a side view when set up for flat placement. 2... Spindle, 3... Cutter, 6... Indexing table (work table), 10... Base, 14... Rotating moving body, 15... Pallet support section, 18A, 18B... Pallet, 57... Rotating joint case, 58a, 58b...first supply/discharge port, 5
9...Piston rod, 60...Clamp cylinder, 65a, 65b...Communication path, 66a, 66b
...Second supply/discharge port, 69...Latching ring, S1, S
2...Standby position.

Claims (1)

[Scope of utility model registration request] An indexing table is placed in front of the main spindle head that moves back and forth, left and right, and up and down, and a rotating moving body that rotatably supports multiple pallets is rotatably supported.
In the pallet changing device, when one pallet is on the indexing table due to the rotation of the rotating moving body, the other pallet is in a standby position,
The rotating moving body is provided with supports corresponding to the respective pallets, and rotary joint cases each having a first supply/discharge port for supplying and discharging pressurized fluid are fixed to these supports, and these rotation The joint case rotatably supports a rotating shaft on the rotation axis of the pallet, and the rotating shaft is provided with a second supply/discharge port, and the second supply/discharge port is connected to the first supply/discharge port. A work clamping auxiliary device for a pallet exchange device, characterized in that it communicates with the workpiece clamping device.