JP5425036B2 - Clamp device and pallet device - Google Patents

Description

  The present invention relates to a clamping device and a pallet device for fixing a workpiece in machining a workpiece such as an automobile engine part.

  Conventionally, as a machining line for machining workpieces such as cylinder heads and cylinder blocks used in automobile engines, a plurality of machining devices are arranged in the order of machining steps, and these workpieces are connected by a conveying device, and workpieces are moved. What conveys in order of a process process is known (for example, patent document 1). A machining apparatus in this type of machining line includes a clamp device that positions and fixes a workpiece, and can perform machining with high accuracy.

JP 2001-121727 A

In recent years, there is a need for mixed-flow production of multiple models in the machining line for efficiency. In the case of mixed flow production, since the fixing position by the clamp differs for each type of workpiece, a dedicated clamping device corresponding to the type of workpiece is used.
However, when a dedicated clamping device is used for each type of work, so-called setup change is required to replace the clamping device every time the production model is changed, which lowers production efficiency and requires a place for the replacement clamping device. Thus, there is a problem that the cost and space increase. This problem can be solved by providing a plurality of clamps so that a single clamping device can handle a plurality of workpieces, and by using a common clamping device.
However, in order to use a common clamping device, many clamps must be densely arranged, and the clamp required to hold one type of workpiece interferes with the workpiece surface of another type of workpiece. As a result, there is a problem that it is difficult to ensure both clamping force and workability.

  The present invention has been made in view of the above-described circumstances, and provides a clamping device and a pallet device that can securely fix a plurality of types of workpieces having different fixing positions individually without impairing workability. The purpose is to do.

  In order to achieve the above object, the present invention provides a clamp apparatus including a plurality of clamps provided on a pallet on which a workpiece is placed during machining and an operation mechanism that operates the plurality of clamps at a time. The workpiece can individually enter the pallet, and the pallet turns when the workpiece of one form enters, and engages with a dog at a predetermined position when the pallet turns, based on the entry of the workpiece of one form. Thus, the pallet is provided with a switch for prohibiting the operation of the specific clamp during the operation of the operation mechanism when fixing the workpiece of another form.

  In the present invention, since the pallet is provided with a switch that engages with a dog at a predetermined position when the pallet turns and prohibits the operation of a specific clamp among a plurality of clamps, the switch is compared with the case where the switch is provided outside the pallet. Thus, the operation of the specific clamp can be prohibited only by turning the pallet and stopping the pallet at a predetermined position. Therefore, it is possible to securely fix a plurality of types of workpieces having different fixing positions individually without impairing workability.

The specific clamp may interfere with the workpiece during operation and retract from the upper surface of the workpiece when not operating.
Since the workpiece interferes with the workpiece during operation, the workpiece can be more firmly fixed. When the workpiece does not operate, the workpiece is retracted from the upper surface of the workpiece, so that interference with the machining tool can be prevented during machining of the workpiece upper surface.

The plurality of clamps may include a common clamp that is commonly used for fixing a workpiece of one form and another form.
Compared with the case where the number of clamps corresponding to the fixed positions of the workpieces in one form and other forms is provided, the number of clamps provided on the pallet can be reduced, and the number of parts can be reduced, the size can be reduced, and the cost can be reduced.
The plurality of clamps may be hydraulically operated clamps, the operating mechanism may include a hydraulic circuit, and the switch may be a switching valve connected to the hydraulic circuit.
Since the operating mechanism is a hydraulic circuit and a large pressure can be output with a small device, the clamping device can be made compact.

  Further, the present invention provides a pallet apparatus having a pallet on which a workpiece is placed during machining, the pallet apparatus including a plurality of clamps and an operation mechanism for operating the plurality of clamps at once. It is possible to enter the pallet individually, on the basis of the entry of one form of work, the pallet turns when the other form of work enters, and engages with a dog at a predetermined position when the pallet turns, The pallet is provided with a switch for prohibiting the operation of the specific clamp during operation of the operation mechanism when fixing the workpiece of another form.

  In the present invention, since the pallet is provided with a switch that engages with a dog at a predetermined position when the pallet turns and prohibits the operation of a specific clamp among a plurality of clamps, the switch is compared with the case where the switch is provided outside the pallet. Thus, the operation of the specific clamp can be prohibited only by turning the pallet and stopping the pallet at a predetermined position. Therefore, it is possible to securely fix a plurality of types of workpieces having different fixing positions individually without impairing workability.

  According to the present invention, the pallet is provided with a switch that engages with a dog at a predetermined position when the pallet turns and prohibits the operation of a specific clamp among the plurality of clamps. In comparison, the operation of the specific clamp can be prohibited only by turning the pallet and stopping the pallet at a predetermined position. Therefore, it is possible to provide a clamping device and a pallet device that can securely fix a plurality of types of workpieces having different fixing positions individually without impairing the workability.

It is a perspective view of the machining apparatus concerning this embodiment. (A) is a top view of the clamping device, and (B) is a bottom view thereof. (A) is a top view of the clamping device when fixing a workpiece of one form, and (B) is a top view of the clamping device when fixing a workpiece of another form. It is an enlarged view of a specific clamp. It is a figure which shows the hydraulic circuit which operates a clamp. It is a figure which shows the hydraulic circuit which operates a clamp. It is a figure which shows operation | movement of the clamp apparatus at the time of the workpiece | work flow of one form. It is a figure which shows operation | movement of the clamp apparatus at the time of the workpiece | work flow of another form.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a clamp device for fixing a cylinder block of an automobile engine, in particular, a clamp device provided in a machining device for milling the upper surface of a cylinder block in a machining line of the cylinder block will be described.
FIG. 1 is a diagram illustrating a configuration of the machining apparatus 1.
As shown in FIG. 1, the machining apparatus 1 includes a base 3, a pallet 7 that is pivotally supported on a pivot shaft 5 (see FIG. 2B) provided on the base 3, and a clamp device 9 provided on the pallet 7. And a processing machine (not shown) for processing one type of work WA and another type of work WB (see FIG. 3), that is, a cylinder block, placed on the pallet 7. In the following description, when it is not necessary to distinguish one form of the work WA from another form of the work WB, the work W is referred to as a work W. The processing machine performs milling of the upper surfaces 11A and 11B (see FIG. 3) of the workpiece W and drilling of journal holes (not shown).

The base 3 supports the pallet 7, the clamping device 9, and the processing machine, and includes side wall portions 13 on both the left and right sides in the flow direction of the workpiece W indicated by an arrow A in FIG. 1.
As shown in FIGS. 1 and 2, the clamp device 9 includes a reference seat 15, a positioning pin 17, a plurality of clamps 19, that is, clamps 19 </ b> A to 19 </ b> F, a seating switching pin 21, and a seating switching valve 23 provided on the pallet 7. The workpiece W is positioned and fixed.
The pallet 7 is a substantially rectangular flat plate-like member, and is pivotally supported by a turning shaft 5 provided on the base portion 3. The reference seat 15 is provided at a predetermined position on the pallet 7 and places the workpiece W thereon. The positioning pin 17 is provided at a predetermined position on the pallet 7, and engages with a positioning hole (not shown) of the workpiece W to position the workpiece W with respect to the pallet 7.

The plurality of clamps 19 include an arm 25 that moves up and down and rotates. In the following description, the arms 25 of the clamps 19A to 19F are referred to as arms 25A to 25F, respectively, and are distinguished as necessary. On the pallet 7, the work W is loaded from above by a transporter (not shown), and the work W is positioned by the positioning pins 17 and fixed at a predetermined position on the pallet 7. When the workpiece W is loaded from above, the arm 25 is pivoted and retracted. When the loading of the workpiece W is completed, the arm 25 pivots on the workpiece W and is placed on the reference seat 15. The arm 25 is held from above and fixed so that the workpiece W does not move during machining.
Each clamp 19 has a fixed position, for example, the position of the workpiece W, which is out of the processing surface of the upper surface 11A, 11B of the workpiece W so as not to obstruct the processing when processing the processing surface of the upper surface 11A, 11B of the workpiece W. The four corners are fixed, and the arm 25 of the clamp 19 is arranged so that the lower side of the upper surfaces 11A and 11B of the workpiece W can be fixed.

By the way, the machining line of this embodiment is configured so that two types of workpieces W, that is, one type of workpiece WA and another type of workpiece WB can be individually entered into the pallet 7 and processed.
However, since the size and shape of the upper surfaces 11A and 11B (see FIG. 3) are different between one type of workpiece WA and another type of workpiece WB, the fixing positions thereof are different. For this reason, in order to make the clamping device 9 common to one type of workpiece WA and another type of workpiece WB, the clamping device 9 includes a plurality of clamps 19 corresponding to the fixed positions of the workpieces WA and WB. Need to be.

In this configuration, the clamp device 9 includes clamps 19A to 19F that are hydraulically operated clamps, and a hydraulic circuit 43 that is an operation mechanism for operating the clamps 19A to 19F at a time. The clamps 19A to 19F include hydraulic cylinders 45A to 49F, rods 29A to 29F, and arms 25A to 25F connected to the rods 29A to 29F, respectively.
The clamps 19A to 19C and 19F suppress four corners of the workpiece WA of one form, and the clamps 19A, 19B, 19D and 19E suppress four corners of the workpiece WB of another form. As shown in FIG. 3A, the workpiece WA is fixed by the arms 25A to 25C and 25F of the clamps 19A to 19C and 19F during machining of one form of the workpiece WA, and as shown in FIG. The workpiece WB is held down by the arms 25A, 25B, 25D, and 25E of the clamps 19A, 19B, 19D, and 19E.

  The clamp 19 includes common clamps 19A and 19B shared for fixing one type of workpiece WA and another type of workpiece WB, so that the space on the pallet 7 is effectively utilized. The arms 25A and 25B of the shared clamps 19A and 19B are divided into two forks, and each tip is formed so as to fix the fixing position of one form of the workpiece WA or the fixing position of the other form of the workpiece WB.

In the arrangement of the clamps 19 described above, the clamps 19 are densely arranged in a narrow region. Therefore, when all the clamps 19 are clamped and the workpiece WB of another form is fixed, the arm of a specific specific clamp 19F among the clamps 19 is fixed. Even if 25F overlaps with the region to be processed of the workpiece WB of another form and tries to mill, for example, the surface to be processed on the upper surface 11B of the workpiece WB of another form, the machining tool interferes with the arm 25F of the specific clamp 19F. There is a problem that you can not.
Therefore, in the present embodiment, the specific clamp 19F is a link clamp as shown in FIG. 4 so that the machining tool can be prevented from interfering with the specific clamp 19F when machining the workpiece WB of another form. In this embodiment, the clamp 19E is a link clamp as with the specific clamp 19F.

  The specific clamp 19F has a hydraulic cylinder 45F fixed to the pallet 7, a rod 29F that expands and contracts by the pressure of the hydraulic cylinder 45F, an arm pin 31 provided at the tip of the rod 29F, and a base end portion 25FA that is rotated by the arm pin 31. An arm 25F that is freely supported, an adjustment screw 33 provided at a distal end portion 25FB of the arm 25F, and a lock nut 37 that locks the adjustment screw 33 so as not to turn are provided. Further, the specific clamp 19F includes a cylinder side link pin 39 provided in the hydraulic cylinder 45F, an arm side link pin 40 provided in an intermediate portion between the base end portion 25FA and the distal end portion 25FB of the arm 25F, One end 41 </ b> A includes a cylinder-side link pin 39, and the other end 41 </ b> B includes a link 41 that is pivotally supported by an arm-side link pin 40.

When the tip of the rod 29F is pulled downward by hydraulic pressure, the arm 25F moves to the release position indicated by the broken line in the figure. At this time, the arm 25F rotates around the arm pin 31 and opens upward, and retreats (withdraws) from both the upper surface 11A of the workpiece WA in one form and the upper surface 11B of the workpiece WB in another form in a top view. . For this reason, when the upper surface 11B of the workpiece WB of another form is milled, the arm 25F does not interfere with the machining tool.
In the present embodiment, when one form of the workpiece WA is placed, when the tip of the rod 29F is pushed upward by hydraulic pressure, the arm 25F moves to a fixed position indicated by a solid line in the drawing. Since the rod 29F pushes up the base end portion 25FA of the arm 25F and the tip end portion 25FB of the arm 25F is pushed down, the arm 25F interferes with the fixing position of the workpiece WA, and the workpiece WA is securely fixed.

5 and 6 are diagrams showing a hydraulic circuit 43 which is an operation mechanism of the clamp 19. A plurality of arrows shown in FIG. 5 indicate directions in which oil flows. Hereinafter, the hydraulic circuit 43 will be described with reference to FIG. 5A.
All parts constituting the hydraulic circuit 43 are provided on the pallet 7, and include hydraulic cylinders 45 </ b> A to 45 </ b> F, oil passages 47 </ b> A, 47 </ b> B, 47 </ b> C, 47 </ b> D, 47 </ b> P, 47 </ b> T, a hydraulic pump 49, and a tank 51. , A solenoid valve 53, a mechanical switching valve 55, a throttle valve 56, and a check valve 57 are provided.

  An oil passage 47P is connected to the hydraulic pump 49, and an oil passage 47T is connected to the tank 51. The oil passage 47P and the oil passage 47T are connected to ports P and T on one end side of the solenoid valve 53, and the oil passage 47A and the oil passage 47B are connected to the ports A and B on the other end side of the solenoid valve 53. It is connected. The oil passage 47A is branched into branch oil passages 47A1 to 47A7 through couplers, and the branch oil passages 47A1 to 47A5 are connected to hydraulic cylinders 45A to 45E through throttle valves 56, respectively. The branch oil passages 47A6 and 47A7 are connected to a port on one end side of the mechanical switching valve 55. The branch oil passage 47A7 is provided with a check valve 57A, which prohibits oil from flowing in the direction from the solenoid valve 53 toward the oil passage 47A. An oil passage 47 </ b> C extending from the port on the other end side of the mechanical switching valve 55 is connected to the hydraulic cylinder 45 </ b> F via the throttle valve 56.

  The oil passage 47B is branched into branch oil passages 47B1 to 47B6 and connected to the hydraulic cylinders 45A to 45F via the throttle valves 56, respectively. The portion between the check valve 57A and the mechanical switching valve 55 of the branch oil passage 47A7 and the oil passage 47B6 are connected by an oil passage 47D, and a check valve 57B is provided in the oil passage 47D. Thus, the oil is prohibited from flowing from the oil passage 47B6 toward the branch oil passage 47A7.

The solenoid valve 53 is an electromagnetic valve having three positions of a clamp position 59, a stop position 61, and an unclamp position 63. At the clamp position 59, between the oil passage 47P and the oil passage 47A, and between the oil passage 47T and the oil passage. 47B, the four oil passages 47A, 47B, 47P, 47T are cut at the stop position 61, and at the unclamping position 63, between the oil passage 47P and the oil passage 47B, and the oil passage 47T. And the oil passage 47A.
The mechanical switching valve 55 includes an operating piece 65 and is provided at one end 7A of the pallet 7 (see FIG. 2). The mechanical switching valve 55 is a switching valve having two positions, a normal position 58 and an operating piece pressing position 60. In the normal position 58, the branch oil passage 47A6 and the oil passage 47C are communicated with each other, and the operating piece pressing position is reached. At 60, the branch oil passage 47A7 communicates with the oil passage 47C.

  The hydraulic cylinders 45 </ b> A to 45 </ b> F constitute part of the clamps 19 </ b> A to 19 </ b> F, respectively, and include rods 29 </ b> A to 29 </ b> F, and these rods 29 </ b> A to 29 </ b> F are connected to the arm 25. The clamps 19 </ b> A to 19 </ b> D are linear clamps in which the arms move up and down, and are in an unclamped state when the rod 29 is raised and in a clamped state when the rod 29 is lowered. On the other hand, the clamps 19E and 19F are link clamps in which the arm swings up and down, and are in an unclamped state when the rod 29 is lowered and in a clamped state when the rod 29 is raised.

Next, the operation of the hydraulic circuit 43 will be described.
When the mechanical switching valve 55 is at the normal position 58, the hydraulic cylinder 45F is connected to the oil passage 47A via the branch oil passage 47A6. There is no check valve 57 in the branch oil passage 47A6.
For this reason, when the solenoid valve 53 is set to the unclamping position 63, as shown in FIG. 5A, hydraulic pressure is applied from the oil passage 47B, the rods 29A to 29D of the hydraulic cylinders 45A to 45D rise, and the hydraulic cylinders 45E and F The rods 29E and 29F are lowered, and the clamps 19A to 19F are released at a time.
On the other hand, when the solenoid valve 53 is set to the clamp position 59, as shown in FIG. 5B, the hydraulic pressure is applied from the oil passage 47A, the rods 29A to 29D of the hydraulic cylinders 45A to 45D are lowered, and the rods of the hydraulic cylinders 45E and 45F. 29E and 29F rise, and the clamps 19A to 19F are in a clamped state at a time.

When the mechanical switching valve 55 is in the operating piece pressing position 60, the hydraulic cylinder 45F is connected to the oil passage 47A via the branch oil passage 47A7. A check valve 57A is provided in the branch oil passage 47A7. The check valve 57A allows oil to go from the hydraulic cylinder 45F to the oil passage 47A, but prohibits oil from going from the oil passage 47A to the hydraulic cylinder 45F.
For this reason, when the solenoid valve 53 is set to the unclamping position 63, as shown in FIG. 6A, hydraulic pressure is applied from the oil passage 47B, the rods 29A to 29D of the hydraulic cylinders 45A to 45D rise, and the hydraulic cylinders 45E and 45F The rods 29E and 29F are lowered, and the clamps 19A to 19F are released at a time.

On the other hand, when the solenoid valve 53 is set to the clamp position 59, as shown in FIG. 6B, hydraulic pressure is applied from the oil passage 47A, so the rods 29A to 29D of the hydraulic cylinders 45A to 45D are lowered and the rod 29E of the hydraulic cylinder 45E is lowered. Rises, and the clamps 19A to 19E enter the clamped state. However, no hydraulic pressure is applied to the hydraulic cylinder 45F by the check valve 57, the hydraulic cylinder 45F does not operate, and the specific clamp 19F remains in the released state.
In other words, the mechanical switching valve 55 functions as a switch that prohibits the operation of the specific clamp 19F when the operation piece 65 is pressed to switch the solenoid valve 53 to operate the hydraulic circuit 43. When the mechanical switching valve 55 is in the operating piece pressing position 60, the operation of the specific clamp 19F is prohibited, and the specific clamp 19F remains in the released state in which the arm 25F is retracted from the upper surfaces 11A and 11B of the workpieces WA and WB.

  By the way, as shown in FIG. 1, the pallet 7 is pivotally supported by a pivot shaft 5 provided on the base portion 3 of the machining apparatus 1. Furthermore, the base 3 of the machining apparatus 1 is provided with a dog 67 for pushing the operating piece 65 of the mechanical switching valve 55 described above. In the present embodiment, the dog 67 is provided on the upstream side of the machining line at a position where the operating piece 65 can be pushed as the pallet 7 turns.

Below, operation | movement of the machining apparatus 1 when each of the workpiece | work WA of one form and the workpiece | work WB of another form is processed is demonstrated.
When entering one form of the workpiece WA, first, as shown in FIG. 7A, the pallet 7 is turned so that the mechanical switching valve 55 is positioned on the left side in the workpiece flow direction A. At this time, the hydraulic circuit 43 is in the state shown in FIG. 5A. That is, the solenoid valve 53 is at the unclamping position 63 and the mechanical switching valve 55 is at the normal position 58. Therefore, the clamps 19A to 19F are in an unclamped state, and the arm 25 of each clamp 19A to 19F is retracted from the mounting position of the workpiece WA.

Next, the workpiece WA of one form is conveyed from the upstream side of the line to the upper side of the clamp device 9 by a conveying machine (not shown), and is then positioned by the reference seat 15 and the positioning pin 17 (see FIG. 2A). One form of the workpiece WA is placed on the pallet 7.
After placing the workpiece WA in one form, the hydraulic circuit 43 is shifted to the state shown in FIG. 5B to fix the workpiece WA. That is, the solenoid valve 53 is switched to the clamp position 59, and the clamps 19A to 19F are operated at a time to set the clamp state.
Next, the upper surface 11A of the workpiece WA is milled by a processing machine (not shown).
After milling, as shown in FIG. 7B, the pallet 7 is turned 90 degrees clockwise so that the mechanical switching valve 55 is positioned downstream of the line. By this turning, the operating piece 65 of the mechanical switching valve 55 and the dog 67 are not engaged, so the hydraulic circuit 43 remains in the state shown in FIG. 5B.

Next, a machining tool (not shown) is entered from the upstream side of the line to process a journal hole (not shown).
After finishing the journal hole (not shown), the hydraulic circuit 43 is shifted to the state shown in FIG. 5A to release the workpiece WA. That is, the solenoid valve 53 is switched to the unclamping position 63 and the clamps 19A to 19F are operated at a time to enter the unclamped state. Then, the work WA is once lifted upward by a transporter (not shown) and then transported downstream of the line.

  On the other hand, when entering the workpiece WB of another form, first, the pallet 7 is turned 90 degrees counterclockwise on the basis of the position of the pallet 7 when entering the workpiece WA of one form (see FIG. 7A). As a result, as shown in FIG. 8A, the mechanical switching valve 55 provided at the one end portion 7 </ b> A of the pallet 7 moves to the upstream side of the line, and the operating piece 65 of the mechanical switching valve 55 moves to the upstream side of the line of the base portion 3. It engages with a dog 67 provided in the. At this time, the hydraulic circuit 43 is in the state shown in FIG. 6A. That is, the solenoid valve 53 is at the unclamping position 63 and the mechanical switching valve 55 is at the operating piece pressing position 60. Accordingly, the clamps 19A to 19F are in an unclamped state, and the arms 25A to 25F of the clamps 19A to 19F are retracted from the mounting position of the workpiece WA.

Next, the workpiece WB of another form is conveyed from the upstream side of the line to the upper side of the clamp device 9 by a conveying machine (not shown), and then lowered by the reference seat 15 and the positioning pin 17 (see FIG. 2A). The workpiece WB of another form is placed on the pallet 7.
After placing the workpiece WB, the hydraulic circuit 43 is shifted to the state shown in FIG. 6B to fix the workpiece WB of another form. That is, the solenoid valve 53 is switched to the clamp position 59 to operate the clamps 19A to 19E to fix the workpiece WB of another form. At this time, since the operating piece 65 of the mechanical switching valve 55 is engaged with the dog 67, the specific clamp 19F does not operate. That is, the specific clamp 19F remains in the unclamped state in which the arm 25F is retracted from the upper surface 11B of the workpiece WB, and the clamps 19A to 19E shift from the unclamped state to the clamped state. Therefore, the arm 25F of the specific clamp 19F does not overlap with the upper surface 11B of the workpiece WB, and interference between the processing tool and the specific clamp 19F does not occur in the processing of the upper surface 11B.
After fixing the workpiece WB, the upper surface 11B is milled by a processing machine (not shown).

  After milling the upper surface 11B, as shown in FIG. 8B, the pallet 7 is turned 90 degrees clockwise so that the mechanical switching valve 55 is located on the left side in the workpiece flow direction A, and machining is performed from the upstream side of the line. A tool (not shown) is entered to process a journal hole (not shown). At this time, since the engagement between the operating piece 65 of the mechanical switching valve 55 and the dog 67 is released, the hydraulic circuit 43 shifts to the state shown in FIG. 5B. That is, the specific clamp 19F shifts from the unclamped state to the clamped state while the clamps 19A to 19E remain in the clamped state. As a result, the specific clamp 19F overlaps the upper surface 11B of the workpiece WB, but interference between the processing tool and the specific clamp 19F does not occur in the processing of the journal hole.

  After finishing the processing of the journal hole (not shown), the solenoid valve 53 is returned to the unclamping position 63, and the hydraulic circuit 43 is brought into the state shown in FIG. 5A. That is, the clamps 19A to 19F are operated at a time to release the fixation. Then, the work WB is once lifted upward by a transport device (not shown) and then transported to the downstream side of the line.

As described above, in the present embodiment, the dog 67 is provided on the base 3 of the machining apparatus 1, and the pallet 7 on which one form of the work WA and another form of the work WB are individually placed on the turning shaft 5 of the base 3. Is pivotally supported. A mechanical switching valve 55 is provided at one end 7A of the pallet 7 so as to engage with the dog 67 when the pallet 7 is turned and prohibit the operation of the specific clamp 19F among the plurality of clamps 19.
For this reason, compared with the case where the mechanical switching valve 55 is provided other than the pallet 7, the operation of the specific clamp 19F can be prohibited only by turning the pallet 7 and stopping the pallet 7 at a predetermined position. Therefore, the operation of operating all the clamps 19 at once and the operation of operating the clamps 19A to 19E other than the specific clamp 19F at a time while prohibiting the operation of the specific clamp 19F can be easily switched and fixed. Both one form of the workpiece WA and the other form of the workpiece WB having different positions can be fixed securely without impairing the workability.

In the present embodiment, the specific clamp 19F is a link clamp, and in the unclamped state, the specific clamp 19F moves backward from the upper surface 11B of the work WB and does not interfere with the work upper surface 11B in a top view. Therefore, when processing the upper surface 11B of the workpiece WB, the processing tool does not interfere with the specific clamp 19F, and the upper surface 11B of the workpiece WB can be processed.
Further, in the present embodiment, the clamp 19 includes shared clamps 19A and 19B that are commonly used for fixing one type of workpiece WA and another type of workpiece WB. Therefore, each of the one type of workpiece WA and the other type of workpiece WB Compared to the case where the number of clamps 19 corresponding to the fixed positions is provided, the number of clamps 19 can be reduced, and the number of parts, the size reduction, and the cost reduction can be achieved at the same time.

  In the present embodiment, the plurality of clamps 19 are hydraulically operated clamps, and the operation mechanism for operating the clamps 19 is the hydraulic circuit 43. Therefore, a large clamping force can be obtained with a relatively small device configuration. The device 9 can be made compact.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified within the scope of the present invention.
For example, in the above-described embodiment, the configuration in which one type of workpiece WA and another type of workpiece WB are lowered from the upper side of the clamp device 9 and placed on the pallet 7 has been described, but the placement directions of the workpieces WA and WB are as follows. It is not limited to this, You may slide and mount in a horizontal direction. In this case, there is no need to rotate and retract the clamps 19A to 19D which are linear clamps. Moreover, although embodiment mentioned above demonstrated the structure which used the clamps 19A-19D as the linear clamp and the clamps 19E and 19F as the link clamp, the kind of clamp is not limited to this.

DESCRIPTION OF SYMBOLS 1 Machine processing device 3 Base 7 Pallet 7A One end 9 Clamping device 11A, 11B Workpiece top surface 19 Clamp 19A, 19B Common clamp 19F Specific clamp 43 Hydraulic circuit (operation mechanism)
55 Mechanical selector valve (switch)
67 Dog W Work WA One form of work WB Other form of work

Claims (5)

In a clamp device comprising a plurality of clamps provided on a pallet on which a workpiece is placed during machining, and an operation mechanism for operating the plurality of clamps at once,
A plurality of forms of workpieces can individually enter the pallet, and the pallet turns when the workpiece of another form enters with reference to when the workpiece of one form enters, and the dog is placed at a predetermined position when the pallet turns. A clamp device comprising a switch on the pallet that prohibits the operation of a specific clamp during operation of an operation mechanism when fixing a workpiece of another form by engaging.   The clamping device according to claim 1, wherein the specific clamp interferes with the workpiece during operation and retracts from the upper surface of the workpiece when not operating.   The clamp apparatus according to claim 1, wherein the plurality of clamps include a common clamp that is shared for fixing a workpiece of one form and another form.   The plurality of clamps are hydraulically operated clamps, the operating mechanism includes a hydraulic circuit, and the switch is a switching valve connected to the hydraulic circuit. The clamping device as described. In a pallet apparatus having a pallet on which a workpiece is placed at the time of machining, and having a plurality of clamps on the pallet and an operation mechanism for operating the plurality of clamps at once.
A plurality of forms of workpieces can individually enter the pallet, and the pallet turns when the workpiece of another form enters with reference to when the workpiece of one form enters, and the dog is placed at a predetermined position when the pallet turns. A pallet device comprising a switch for prohibiting the operation of a specific clamp during operation of an operating mechanism when fixing a workpiece of another form by engaging the pallet.

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