JPS63139631A - Work clamp device for index table - Google Patents

Abstract

PURPOSE:To reduce manpower for modifying the arrangement, by providing a means for facilitating modification of arrangement even in a clamp system employing jigs as well as flat installation system to a device for clamping a work to an index table corresponding to multi-type small quantity production. CONSTITUTION:In a rotary coupling case 57 facing with the fixing face of an index table 6, a clamp cylinder 60 for flat installation is supported rotatably onto a swivel shaft of the index table 6. A path communicating with a first discharge port of the rotary coupling case 57 is formed through the cylinder body of said cylinder 60 and the rotary coupling case 57, and a second discharge port communicatable with said is provided. Furthermore, a means for blocking axial advance of a piston rod 59 under retreated state is provided between the piston rod 59 and the cylinder body. Consequently, a work is clamped through function of the cylinder 60 in case of flat installation while the blocking means functions in case of fixing through jigs, and a portion of piping is shared with the cylinder 60 thus clamping a work associated with jigs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a workpiece clamping device for clamping a workpiece to an indexing table.

Conventional technology In order to attach a workpiece to an indexing table, a hydraulic path is provided in the rotation axis of the indexing table, a pressure oil supply/discharge port is provided on the workpiece mounting surface of the indexing tape, and the workpiece is mounted on the indexing table. The supply/discharge port is connected via piping to a clamp cylinder arranged corresponding to the workpiece, and the workpiece is clamped. The workpiece clamping method is to place the workpiece on the indexing table! There are two methods: a flat-laying method in which the workpiece is placed on the table surface with a clamp cylinder, and a method in which the workpiece is clamped with a clamp cylinder on a mounting surface perpendicular to the table surface using a tombstone jig. One of the clamp methods is used exclusively.

Problems to be Solved by the Invention In response to the recent high-mix, low-volume production, it is required to be able to easily change setup between the above-mentioned flat-laying method and the clamping method using a jig. If you change the setup by using separate clamp cylinders for each clamp method, you can also replace all the clamp cylinders.
In addition, the hydraulic piping had to be completely changed and connected.
6. Also, a great deal of effort must be spent on changeovers.

Since the pressure oil supply port is on the index table side, if the index table rotates horizontally, when performing such a setup change, there is a possibility that chips may get into the O-ring or other sealing member of the pressure oil supply/discharge port. It easily adhered to the surface and could cause oil leakage. Furthermore, in the type in which the pallet is placed on the indexing table, the pallet is separated from the indexing table, so there is a problem in that the hydraulic piping cannot be connected as described above.

Means for Solving the Problems The present invention provides a rotary joint case disposed facing the mounting surface of the indexing table, in which a clamp cylinder, which is placed horizontally, is rotated around the pivot axis of the indexing table. The clamp cylinder is rotatably supported, and a communication passage communicating with a first supply/discharge port of the rotary joint case is formed in the cylinder body of the clamp cylinder and the rotary joint case, and a second supply/discharge port communicating with the communication passage is connected to the cylinder body. The present invention is characterized in that a blocking means is provided on the main body and is further provided between the piston rod and the cylinder main body to prevent the piston rod from moving forward in the axial direction when the piston rod is in the retracted state.

Function According to the above structure, when the work is placed flat, the second supply/discharge port provided in the cylinder body is closed and the blocking means is kept in the released state, so that the workpiece placed flat is held by the original function of the clamp cylinder for flat placement. If the piping is to be clamped and installed with a jig, actuate the blocking means and connect the second supply/discharge port of the cylinder body to the clamp cylinder on the jig side, so that a part of the piping can be used as a clamp cylinder for horizontal placement. By sharing it, it can also be used for workpieces with jig attachment, making one-stage replacement easy and quick.

Embodiment As shown in FIGS. 1 to 3, the column 1 has a spindle head 2A.
A spindle 2 is rotatably supported.

A cutter 3 is attached to this spindle 2. The column 1 is configured to move back and forth and left and right with respect to the bed body 4 of the machine tool, and the spindle 2 is configured to move up and down with respect to the column 1. In front of the cutter 3, an indexing base 7 of a known indexing device 5, such as that disclosed in Japanese Patent Application Laid-Open No. 53-124389, is fixed to the bed body 4, and an indexing table 6 is mounted on the indexing base 7. It is indexed at a predetermined angle in a horizontal plane by a rack and pinion, and is clamped at that position to an indexing base 7 by a clamping device (not shown). A bracket 8 made of welded plate material is fixed to the front side of the indexing device 5 of the bed main body 4 with bolts 9, and a base 10 is fixed to the front side of the bracket 8 by positioning it in the vertical direction with a key 11. There is. As shown in FIG. 3, a pivot shaft 12 is rotatably and vertically supported on this base 10 by underbelly bearings 13, 13. As shown in FIG. 4, two sets of 90 degree fan-shaped grooves 518 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. base 1o
In order to supply pressurized oil even when the pivot shaft 12 turns 90 degrees as described later, supply/discharge ports 53a to 53d are provided which are open to the fan-shaped grooves 51a to 51d, and the respective supply/discharge holes 53
a, 53b, 53c, and 53d each form a pair of three-position solenoid operated valves 54A of the pressure boat block.
, 54B.

A rotating moving body 14 is fixed to the upper end of this rotating shaft 12. This rotating moving body 14 is composed of an L-shaped rotating plate 14a that opens at a right angle, and supporting arms 14b, 14b that are fixed to opposite ends of the L-shaped portion.
A pallet support section 15 is formed by the two support arms 14b, 14b. When one of the pallet support parts 15 is located above the indexing device 5, the other part is 90 degrees above the indexing device 5.
It is supposed to be in the open standby position 5L (S2).

On the support arms 14b, 14b, an arc-shaped presser foot 16 is sandwiched between the lower flanges 18a, 18b on top of a pallet 18A (18B) (hereinafter also referred to as pallet 18) and held around the pin 17 by a pin 17. The lower flange 18b of the pallet 18 can be suppressed.

Further, the support arms 14b, 14b have protrusions 1 facing each other.
A positioning pin 21 is provided on the upper surface of the projection 19 to fit into a positioning hole 18c drilled in the lower surface of the upper flange 18a of the pallet 18. Pads 22 for receiving the lower surfaces of the flanges 18a are fixed to each of the flanges 18a. 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 circumference of the presser foot 16 of the opposing support arms 14b, 14b, and the presser foot 16 is in contact with the lower flange 18b. Sometimes, the positioning pin 21 is located in the positioning hole 1.
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 upper and lower flanges 18a and 18b are separated from the support arm 8c. 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. Next, the lower flange 18 of the pallet 18
One positioning hole 23a, 23b is drilled in the lower surface of each part, and a diamond pin 24 and a round pin 25.b are fitted into the positioning holes 23a, 23b. A positioning plate 27 exemplified as a positioning device is provided with a plurality of pads 26 for receiving the lower surface of the lower flange 18b of the pallet 18, and is fixed to the upper surface of the indexing table 6. pin 25
In the engaged state, the pallet 18 becomes integral with the indexing table 6.

The moving device for the rotating movable body 14 includes a cam groove 28 formed on the lower surface of the rotating plate 14a, a swing motor 30 whose output shaft 29 rotates 90 degrees horizontally, and a swing arm connected to the output shaft 29. 31, a cam follower 32 that slides in the cam groove 28 is rotatably supported at the tip of the swing arm 31, and the swing arm 31 is
) position and (B) position, the positions of the two pallets 18A and 18B can be changed to the upper position of the indexing device and the standby position! !
It is designed to be moved using SL and S2.

Also, along the longitudinal edge of the cam groove 28, the block 3
3.33 is fixed to the back surface of the rotating plate 14a, and the rotating plate 14
cam follower 3 when a is raised by the vertical movement device described later.
1 from coming off the cam groove 28.

Next, the vertical movement device will be explained. As shown in FIG. 3, the vertical movement device connects a cylinder 35 to the lower surface of the base 10 so that the piston rod 34 is located vertically below the pivot shaft 12, and a bearing 36 is connected to the tip of the piston rod 34. The connecting shaft 37 is fixed to the lower end of the pivot shaft 12, and a ring 38 is screwed onto the lower side of the connecting shaft 37 to the piston rod 34.

Further, between the nut 39 screwed on the outside and the rond side flange 35a of the cylinder 35, when the 3-position electromagnetic operation valve 40 of the pressure port block is set to neutral and the clamping force due to the hydraulic pressure is released, the rotating movable body 14 ．． A spring 43 is interposed to substantially balance the weight applied to the piston rod 34 from above in the axial direction, such as the pivot shaft 12, and to prevent the clamping force from being generated by these weights.

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 IA surface of the swivel plate 14a and positions the pallet support part 15 on the index table 6 and in the standby positions S1 and S2. It is attached in two places.

Next, the work clamp device will be explained.

Supports 55A and 55B that rise upward and extend above the two pallets 18A and 18B are fixed to the upper surface of the rotating moving body 14.

A piping portion 5 connected to the communication holes 52a to 52d via O-rings is connected to the base portion 55C of the supports 55A and 55B.
6a to 56d are provided. Support body 55A (55
At the tip of B), there is a rotary joint case 5 as shown in FIG.
7 is fixed, 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. In addition, the one-rotation 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 workpiece or jig mounting space), and the pallet 18
8 is positioned on the index table 6, the piston rod 5 moves in the axial direction on the rotation axis of the pallet 18.
A clamp cylinder 60 having a clamp cylinder 9 is supported to rotate about an axis. The cylinder body 60A of this clamp cylinder 60 is composed of a cylinder tube 61, a rod cover 62, a head cover 63, and a piston 64.
The cylinder chamber and the first supply/discharge ports 58a, 58
b are communicated with each other through communication passages 65a and 65b. The communication passages 65a, 65b of the cylinder tube 61 are further connected to a pair of second supply/discharge holes 66a, 66b formed in the rod cover 62.
These are connected to each other, and are usually plugged with plugs. The piston rod 59 is provided with a flange 67 for fully attaching the presser foot for flat placement at its tip, and a protrusion 68.
and an insertion hole 70 formed in a locking ring 69 rotatably mounted on the front surface of the rod cover 62 by 90 degrees.

By changing the relative angular positional relationship between the two, the piston rod constitutes a blocking means that prevents the piston rod from moving forward in the axial direction in the retracted state. The flange 67 is an L-shaped guide 71
The tip of the L-shaped guide 71 is sandwiched between the presser full support 72, and the shaft 71a extending upward is slidably inserted into the guide hole 73 of the rotary joint case 57. A pin 74 protruding from the locking ring 69 enters the guide groove 71b formed in the shaft 71a, and the presser foot 7
5 detents are configured. Also, rod cover 6
2 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, 56d), respectively.
are connected to the piping.

Now, while processing a workpiece on the pallet 18A, the workpiece is positioned and placed on the pallet 18B on the support arm 14b using a positioning pin (not shown), and the electromagnetic operation valve 54B is set to the left position, and pressure is applied from the supply/discharge port 53b of the base 10. Oil is supplied, and the piston rod 59 of the clamp cylinder 6o on the pallet 18B is lowered to clamp the workpiece W. On the other hand, when the machining of the work on the pallet 18A is completed, the solenoid operated valve 54A is set to neutral to temporarily release the work clamp on the pallet 18A, and the solenoid operated valve 4o is switched to the left position, and the piston rod 34 is raised. As a result, the pallet support part 15 also rises, and the positioning pin 21 of the support arm 14b engages with the positioning hole 18c of the pallet 18A, and the pad 22 comes into contact with the lower surface of the upper flange 18a of the pallet 18A, splitting the pallet 18A. The round pin 25 and diamond pin 24 of the take-out table 6 are disengaged,
Then, the positioning pin 41 is raised to a position where it is removed from the positioning bush 42. Next, confirm this rising end using a limit switch (not shown), switch the electromagnetic operation valve 54A to the left again, lower the presser foot 75, and lower the pallet 1.
Clamp the work W on 8A, operate the swing motor 30, and move the swing arm 31 from the (A) position to the (B) position.
oscillate. The cam follower 32 of the swing arm 31 moves along the blocks 33, 33 and the cam groove 28, rotates the moving body 14 90 degrees h2 times, moves the pallet 18B that was in the standby position S1 to the upper part of the index table 6, and moves the pallet 18B to the top of the index table 6. 1
8A to the standby position S2 at the bottom of FIG. 1 at the same time.

During this rotation, the pallet 18A (18B) does not move relative to the pallet support part 15 because the positioning hole 18c of the upper flange 18a is fitted into the positioning pin 21 of the support arm 14b, and the workpiece W on it Since they are each clamped by the clamp cylinder 60, they do not move. When this rotation is finished, the solenoid operated valve 54B is set to neutral, the solenoid operated valve 40 is switched to the right position, and the piston rod 34 is lowered, and the rotating movable body 14 is lowered accordingly, and the lower surface of the pallet 18B is exposed to the round pin 25, etc. is positioned at
The presser foot 1 is then placed on the pad 26 and further lowered to release the positioning of the pallet 18B and the support arm 14b.
6 presses the upper surface of the lower flange 18b of the pallet 18B, clamps the pallet 18B onto the index table, and 1
Next, the operation valve 54B is switched to the left to clamp the workpiece. In this way, the cutter 3 is moved to a predetermined position and machining is started. However, when indexing and machining a workpiece, the solenoid operated valve 40 is set to neutral with the cutter 3 away from the workpiece to release the hydraulic pallet clamp. ,Also,
Switch the solenoid operated valve 54B to the right to completely release the work clamp. Then, the lower flange 1 of pallet 18B
8b is pushed by the weight of the rotating moving body 14 connected to the piston rod 34, the rotating shaft 12, etc., but the spring 4
These are canceled by the spring force of 3, and the presser foot 16 comes into contact with the lower flange 18b of the pallet 18B, and as a result, the clamping force by the presser foot 16 is completely released, and the indexing table 6 allows indexing. It can be carried out. After indexing, the workpiece is clamped.

While machining is carried out in this manner, processed workpieces are removed from the pallet 18A at the standby position S2, and unprocessed workpieces are mounted thereon. 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 embodiment, 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. Furthermore, the pallet is not limited to two pallets installed at 90 degrees apart, but may be one with stripes spaced 180 degrees apart.

Next, a case in which a workpiece is processed using the tombstone jig shown in FIG. 8 will be described. Tombstone jig.

Vertical positioning pins 82 and 83 are protruded from a jig main body 81 which is vertically disposed on a substrate 80 fixed to the upper surface of the pallet 18, and a large number of clamp cylinders 84 are further arranged on the jig main body 81. This clamp cylinder 84 is designed to clamp the workpiece W to the jig main body 81. The jig main body 1 is provided with a conduit 85 that connects a clamp cylinder 84.

The connection port 86 is provided at the top of the jig main body 81.

Now, when changing the setup from the flat work clamp state, first remove the support 72 of the flat work clamp 75 from the flange 67, remove the L-shaped guide 71, and then move the piston rod 59 to the rearward end. , and the locking ring 69 is rotated 90 degrees so that the protrusion 68 of the piston rod 59 abuts against the locking ring 69 and cannot be inserted into the insertion hole 70, so that even if pressure oil is supplied, the piston will not be inserted. Make sure that the rod 59 does not move forward. Next, the tombstone jig is fixed onto the pallet 18A (18B), a pair of detents 87 fixed to the top of the tombstone jig are engaged with the detent grooves 76 of the rod cover 69, and the second supply/discharge rod 66a is , 66b and the connection port 86 of the jig are connected by hose piping.

According to such a configuration, when the tombstone jig is indexed by the indexing table 6, the cylinder body 60A rotates together with the detent 87, but pressure oil is smoothly supplied between the rotary joint case 57 and the clamp. can maintain its condition. Furthermore, when moving the pallet 18 from above the indexing table 6, the pallet 18 is lifted upward by the support arm 14b of the rotating moving body 14. At this time, the detent 87 rises within the detent groove 76, and .

Since the piping is also a hose piping with an amount of expansion and contraction commensurate with the amount of movement, the tombstone jig can be moved between the index table 6 and the standby position while maintaining the clamped state.

Effects of the Invention As described above, in the present invention, the clamp cylinder is disposed on the rotation axis of the indexing table so that its piston rod moves in the axial direction, so that the workpiece placed flat on the indexing table can be can be clamped onto an indexing table. Moreover, this clamp cylinder is separated from the indexing table and rotatably supported by the rotary joint case to form a so-called pressure fluid distributor, and the cylinder body is provided with a second supply/discharge port that communicates with the communication path. When supplying fluid to a clamp cylinder mounted on a tombstone jig on a table, for example, connect the supply/discharge port of the cylinder body to the clamp cylinder without removing the clamp cylinder for flat clamps. Even if the tombstone jig is indexed, pressure fluid can be smoothly supplied to the clamp cylinder on the tombstone jig side, making it possible to use a special jig such as a tombstone jig. It is easy to change the setup between the case where it is placed horizontally and the case where it is placed horizontally.

In addition, since the supply/discharge port of the cylinder body is not on the mounting surface of the index table, there is no risk of chips adhering to the supply/discharge port during setup changes even if the index table rotates horizontally. , it has the advantage that it can also clamp workpieces on pallets.

[Brief explanation of the drawing]

Figure 1 is a plan view of the pallet exchange device, Figure 2 is a side view,
Figure 3 is a sectional view of I-1 in Figure 1, and Figure 4 is a cross-sectional view of ■- in Figure 3.
■Cross-sectional view, Figure 5 is a longitudinal cross-sectional view of the clamp cylinder, Figure 6 is a vertical cross-sectional view of the clamp cylinder.
The figure is a sectional view taken from ■-■ in Fig. 5, and Fig. 7 is fV-r in Fig. 5.
The V sectional view and FIG. 8 are side views using a tombstone jig. 2...Spindle, 3...Cutter, 6.
... Indexing table (work table), lO... Base, 14... Rotating moving body, 15... Pallet support part, 18A. 18B...Pallet, 57...Rotary joint case,
58a. 58b...First supply/discharge port, 59...Piston rod, 60...Clamp cylinder, 65a, 65b...
・Communication path, 66a, 66b...second supply/discharge port, 69
... Locking ring, Sl, S2 ... Standby position Patent applicant Howa Kogyo Co., Ltd. Fig. 4 51d (51c) Fig. 5 I6 Fig. 8IB Fig.

Claims (1)

[Claims] 1. A rotary joint case having a first supply/discharge port for supplying and discharging pressurized fluid is arranged facing the workpiece mounting surface of the indexing table at a predetermined distance from the indexing table, and supports a fluid cylinder having a piston rod that moves in the axial direction on the rotation center axis of the indexing table so as to rotate around the axis, and the rotary joint case and the cylinder body of the fluid cylinder include a cylinder body. A communication passage is formed in the inner cylinder chamber and the first supply/discharge port, and a second supply/discharge port is provided in the cylinder body, and a second supply/discharge port is provided in the cylinder body, and a piston is provided between the piston rod and the cylinder body. A workpiece clamping device for an indexing table, characterized in that the rod is provided with a blocking means capable of blocking axial movement when the rod is in a retracted state.