JP2001038567A - Exchange system for work mounting jig pallet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select and use a plurality of jig pallets, having holding structure parts corresponding to the respective works different in size and a shape, according to the work. SOLUTION: In a machining center 1 provided with a main spindle 2 and machining a work 50 in a state to rise and stand the work by a jig pallet 10 and moving forward and backward a work mounting table 3 with the jig pallet held throughout a range extending from its machining position to a work delivery position A situated at an outside part, a plurality of jig pallets corresponding to different works are contained in a standing-upright state in the outside position of a work conveying in and out station 8 situated at a side part in a work delivery position. A jig pallet stocker 7 is provided to deliver a jig pallet, selected according to a command, between the receiving board of the pising work conveying in and out station and the pallet stocker. The work is mounted on the jig pallet received from the pallet stocker 7 and delivered to the work mounting table 3 through the work conveying in and out station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the handling of a jig pallet which is used for processing a relatively large work to keep the work under a predetermined condition to facilitate handling during the processing. In addition, the present invention relates to a work mounting jig pallet replacement system that enables a jig pallet created according to a type of work to be handled to be selected and used according to a work to be processed.

[0002]

2. Description of the Related Art Conventionally, when a large member requiring machining such as a turning frame in a construction machine such as a power shovel or a crawler crane is machined by a machine tool, each machining of a workpiece (work) is performed. The surface is individually machined using a machine tool according to each machining condition.

[0003] Usually, for processing such a large-sized work, a processing means capable of increasing the most reliable processing accuracy on a surface to be processed in each part thereof is employed. Therefore, for example, in the case of a revolving frame (work 50) in a construction machine as illustrated in FIG. 8, the revolving wheel mounting seat surface 51 and the other device mounting holes on the upper surface during use, and on the opposite side. The machined part on the surface where it is located, the boom support shaft hole 52 and the mounting hole 5 for the undulating cylinder
Processing of four sides such as 3 will be performed.

As a processing procedure of such a work, a plurality of machine tools are used to sequentially transfer the work by a transfer manipulator, a crane or the like, and each part is processed. For example, the work 50 is controlled by a machining center.
The cutting of the turning wheel mounting seat 51 located on the lower surface and the drilling of the mounting hole are performed. In this case, of course, the processing is performed with the processing surface facing the main spindle. Next, the processed workpiece 50 is carried out of the machining center and set in a reversing device to reverse the workpiece in a direction suitable for the next processing. The reversed work is carried into the next machining center, and the surface opposite to the surface to be processed in the previous process is processed. Thereafter, the work is unloaded from the machining center and the boss side surface 52 'and the support shaft hole 52 at the work side surface are positioned by a boring machine or the like.
Processing such as. In this way, the work, which has been sequentially processed in each part, is cleaned by the cleaning device for the lastly attached chips, and is transferred to the next operation step.

When these parts are machined, the work is directly mounted on the work mount of the machining machine and machined. If the work is structurally complicated and comes and goes, various treatments are performed according to its shape. It is mounted so that the machined surface can be used for cutting with a cutting tool using tools and auxiliary materials. Such a treatment is often handled in the same manner for workpieces of other shapes.

[0006]

As described above, in the cutting of a conventional large-sized work (the revolving frame in this example), the work is sequentially moved in a plurality of steps (four steps in the above embodiment). Since each part is machined, there is a problem that much labor is required for attaching and detaching on a work mounting table and transferring and slinging work for transferring many works and works. In recent years, in the case of high-mix low-volume production, if a workpiece is machined by a dedicated machine tool for each machined part, a large amount of expense is required for attaching and detaching and transporting the work on the machine tool. There is a problem that efficiency is reduced and processing cost is increased. Furthermore, there is also a problem that a work space is wasted because many mechanical equipments are installed.

[0007] In order to use a machining center capable of processing a work by one unit over the entire surface instead of the conventional processing method having such a problem, how to handle the work rationally. There's a problem.

The present invention has been made to solve the above-mentioned problems, and uses a jig pallet on which a work is mounted so that once the work is mounted according to the shape and structure of the work, almost the entire work can be performed. An object of the present invention is to provide a work mounting jig pallet exchange system that enables a plurality of jig pallets provided with holding structures corresponding to those having different dimensions and shapes to be selected and used according to a work. Things.

[0009]

In order to achieve the above-mentioned object, a work mounting jig pallet replacement system according to the present invention raises and holds a work on the jig pallet at a position in front of a spindle. The machining center, which can hold the jig pallet from the processing position to the work transfer position arranged on the outer side to allow the work mounting table to move forward and backward, has a side portion at the work transfer position. A work loading / unloading station is provided that can raise and lower the jig pallet holding the work.Furthermore, a plurality of jig pallets corresponding to different workpieces are set up and accommodated outside the work loading / unloading station and selected by command. Jig pallet storage that can be transferred to and from the holder of the work loading / unloading station Is provided, by mounting the work on the jig pallet that was accepted from the jig pallet stocker,
The work is transferred to the work mounting table via the work loading / unloading station.

According to the present invention as described above, when handling a large work, when the work is mounted in a predetermined posture on a jig pallet in which mounting conditions are set in advance, the jig pallet on which the work is mounted is mounted. Can be moved to the machining center processing position by moving it upright, and after processing, the jig pallet on which the work is mounted is taken out of the machine from the processing position and laid down to facilitate removal. . As described above, since the workpiece can be moved in the upright state, the required floor area can be minimized. In addition, when processing a different work such as a model of a work, it can be handled by calling another jig pallet stored in advance and exchanging the jig pallet, which has an effect that work setup can be efficiently performed in a short time.

At the work transfer position, the jig pallet holding surfaces of the corresponding devices are positioned so as to be flush with each other. In this way, when transferring the jig pallet between the work mounting table and the holder of the work loading / unloading station, the jig pallet in the upright state can be easily moved sideways by the transfer device and transferred. Thus, workability can be improved.

The transfer means for transferring the jig pallet hangs the jig pallet on an upper portion of a work mounting table and a holder of a work loading / unloading station at an upper portion, and guides the lower portion with a guide roller to guide the work to the work pallet. It is preferable that the transporting device is configured to be traversed by a traction piece of a traversing drive device attached to an upper portion of the holding body of the loading / unloading station. By doing so, it is possible to reduce the driving force required for transporting the jig pallet.

The holder of the work loading / unloading station is provided with a traversing drive device which hangs the jig pallet on the upper portion thereof and can traverse the jig pallet for one stroke, so that the pallet can be raised and lowered by approximately 90 °. The jig pallet is held on the front surface of the jig pallet, so that the work can be mounted on and detached from the jig pallet on the holding surface in the downturn state. In this way, when the work is mounted on the jig pallet or when the work is removed, the work can be performed with the jig pallet down, so that the work can be handled safely. Also, when sending the jig pallet on which the work is mounted to the machining position of the machining center, if the holder of the work loading / unloading station is raised, the work can be sent directly to the work mounting table side of the receiver.
Work efficiency can be increased.

If a notch for selection is provided below the side edge of the jig pallet, when the jig is stored in the jig pallet stocker, the accommodation address is set by the notch for selection. It can be maintained correctly and can be processed without making mistakes when putting in and out.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a work mounting jig pallet replacement system according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a machining center incorporating a work mounting jig pallet changing system according to the present embodiment. FIG. 2 is a side view showing an up-and-down state of a holder of a work loading / unloading station. FIG. 4 is a front view showing an example of a jig pallet for mounting a work, and FIG. 4 is a side view showing a part of a jig pallet on which a work is mounted on a scale, and FIG. Partial enlarged side sectional views showing a portion are shown.

FIG. 1 shows a machining center of the type in which the main shafts are arranged opposite to each other. The left and right main shafts 2 and 2 'of the machining center 1 are driven by well-known means, are movable in the Y-axis direction via support frames 4 and 4', and advance and retreat in the axial direction to work. It can be processed. The work mounting table 2 is provided between the support frames 4 and 4 'of the left and right main shafts 2 and 2' so as to be movable in a direction orthogonal to the main shafts 2 and 2 'and provided on one side in one direction. The workpiece transfer position A can be moved from the processing position to the workpiece transfer position A, and is rotatably provided. In addition, various tools are set in the tool changer 5,
The workpiece is automatically replaced at 5 'so that the workpiece can be processed in a predetermined order.

On the work mounting table 3 of the machining center 1, a T-shaped scale 6 is installed. A guide portion 6a (a plurality of rollers provided with a lifting function for centering) has a front surface which serves as a holding surface of the jig pallet and which can hold the jig pallet on the holding surface. And a positioning pin 6c for operating a hydraulic cylinder for positioning a jig pallet received in an appropriate position on the upper side. In addition, a clamp mechanism 6d (operated by a hydraulic cylinder) for fixing a side end of the jig pallet is attached to a main portion of the holding surface. A required watermark hole 6b is formed in the upright portion of the workpiece so that the workpiece can be machined while the machined portion on the work mounting surface (holding surface) side is mounted.

At the side position of the work transfer position A, the work 50 is mounted on the jig pallet 10 and sent to the processing position, or the processed work is removed from the jig pallet 10 and the next work process is performed. Work loading / unloading stations 8 and 8 'are provided for performing the work of sending the workpieces to the workpieces.

This work loading / unloading station 8, 8 '
Is a dimension capable of holding the jig pallet 10, and as shown in FIG.
And a receiving plate 20 (corresponding to the holding body of the present invention) which is configured to be inverted in a range of approximately 90 °. The receiving board 20 is configured to hold the jig pallet 10 upside down by a rail receiving portion 31 (guide holding portion) provided on an upper surface thereof with a front surface (upper surface) as a holding surface 23. A transport device 30 (corresponding to the transport means of the present invention) transports the jig pallet 10 to be handled by suspending it at the upper end of the receiving plate 20 and slidably traverses along the holding surface 23. ) Is attached.

As shown in FIG. 3, the jig pallet 10 is a relatively thick steel flat plate which can position and hold a predetermined work 50 on the front surface thereof. A plurality of contact pads 12 with a hydraulic cylinder and a plurality of hydraulically actuated clamps 11 are provided on a mounting surface (front surface) so as to be clamped and fixed at a plurality of points. Those clamps 11 and buckles 1
The hydraulic cylinders 2 are respectively piped through hydraulic piping connections (not shown) provided on the jig pallet 10, and are located at the side positions of the work loading / unloading station 8 via the hydraulic piping connections. A hydraulic pipe is connected (connected by an auto coupler) from a hydraulic controller (not shown) separately installed. The connection of the hydraulic piping is performed only when clamping and unclamping the work,
Otherwise, it is not connected. In addition, the clamp 1
Each of the hydraulic cylinders attached to the base 1 and the backing 12 is configured to maintain the clamped state even after the connection with the hydraulic controller by the auto coupler is cut off in the work fixed state.

The jig pallet 10 is provided with a slide rail 14 at an upper end when the jig pallet is raised, and a notch 13 is provided at both ends thereof as a power transmission means when being slid and transferred by the transfer device 30. , 13 'are formed. The lower end of the jig pallet 10 is formed in parallel with the slide rail 14 so as to serve as the guide portion 15 during the slide transfer. In addition, a watermark hole 17 is provided at a key portion of the board surface so that the rear surface of the work 50 in a mounted state can be machined. Other,
Notches 18 and 18 ′ are provided on both lower side surfaces so as to serve as an index for a work in selection by the jig pallet stocker 7.

FIG. 6 is a diagram showing the transfer device attached to the receiving board of the work loading / unloading station and the operation thereof. The transfer device 30 includes a rail receiving portion 31 that engages with and guides the slide rail 14 of the jig pallet 10 held on the upper side when the receiving board 20 stands up;
A ball screw shaft 33 driven forward and reverse by a motor 32 attached thereto, a pulling piece 34 screwed to the ball screw shaft 33 and moved, and the ball screw shaft 33 are supported and can be traversed in a required section. And a traversing means 35.

The traversing means 35 has a rack 35b on its lower surface.
A drive rod 35a having a required length and
And a pinion 36a driven by a traversing drive motor 36 fixed to 0. The moving distance of the traction piece 34 traversed by 33 is lengthened.

FIG. 7 is a side view showing a part of the jig pallet stocker. This jig pallet stocker 7
Is a device that accommodates a plurality of jig pallets 10 for holding works of different types (models / types) to be handled in an upright state, and is arranged outside the work loading / unloading stations 8, 8 '. In the jig pallet stocker 7, the jig pallet 10 is accommodated in the standing state at regular intervals, and is slightly parallel to the work loading / unloading stations 8, 8 'as shown in FIG. The actuator is moved within a required distance by a driving machine (not shown) in the Z-axis direction at intervals.

The jig pallet stocker 7 is divided into a required number of framed main bodies 7a each having a required dimension, and is accommodated in the divided accommodating space 7A. For convenience, all jig pallets
However, at both upper and lower ends, the front and rear surfaces are held upright by a plurality of rollers 7d, 7d 'so as to be movable in the width direction. In addition,
The lower end is supported by a roller 7c incorporated in the receiving table 7b.

The jig pallet 10 in the partitioned space 7A is moved to the work loading / unloading station 8,
The stocker body 7a is positioned on the side surface of the 8 'receiving tray 20 so that the jig pallet 10 can be delivered with the back surface and the holding surface 23 of the receiving tray 20 aligned on the same upright surface. Is controlled by a control unit (not shown). Further, the stocker body 7a stops and the required jig pallet 10 is transferred to the receiving plate 20 of the work loading / unloading station.
An extruding mechanism 7B for sending out to the side is installed at a position outside the stocker body 7a. In the lower part of the stocker main body 7a, the notch 18,
An optical sensor is provided for detecting the cutting amount 18 '(in general, the cutting amount in the height direction is made different) to select the type of the jig pallet, and the detection signal is transmitted to the control unit. ing.

The schematic diagram of the machining center shown in FIG. 1 shows a case where the above-mentioned work loading / unloading station 8 and jig pallet stocker 7 are disposed on both left and right sides of the work transfer position A. In such a facility, the work can be alternately fed into and taken out of the processing section at both work loading / unloading stations 8, 8 '.

When machining the work 50 in the machining center 1 as described above, the jig pallet 10 holding the work 50 is mounted between the work position and the removal position (the work loading / unloading stations 8, 8 '). Is transported in the following procedure.

First, when the type (model / model) of the work 50 to be machined is determined, an operator performs a pallet call operation for selecting a required jig pallet 10 on an operation panel (not shown). Then, the jig pallet stocker 7 is moved back and forth in the direction of the arrow a (a drive device of the jig pallet stocker 7 not shown is operated) to select a required jig pallet.

When the accommodation position of the selected jig pallet 10 in the jig pallet stocker 7 stops at the side position of the upright receiving plate 20, the extruding device 7B (or 7B ') attached to the jig pallet stocker 7 is provided. ) Is operated to push the selected jig pallet 10 out of the partition of the stocker body 7a to the front surface of the receiving board 20. at the same time,
The ball screw shaft 33 of the transfer device 30 attached to the upper part of the receiving board 20 is driven to traverse the traction pieces 34 and the traversing means 35 is operated to select the traction pieces 34 to be traversed and extruded. The notch 13 of the jig pallet 10 is engaged. The stocker body 7a
When the jig pallet 10 is moved from the inside of the partition to the receiving plate 20 side, the jig pallet 10 can be correctly moved without shaking because it is held between the upper and lower rollers as described above. Thereafter, when the ball screw shaft 33 is reversed and the traversing means 35 is simultaneously actuated in reverse to pull back the pulling piece 34, the jig pallet 10 is moved to a predetermined position on the front surface of the receiving plate 20 and received.

The jig pallet 10 selected for the receiving board 20
Is fixed, in the work loading / unloading station 8, the hydraulic cylinder 22 is driven to lower the receiving plate 20. In this state, the work loading / unloading station 8 has the jig pallet 10 placed on the receiving board 20 and is kept horizontal. Therefore, the required work 50 processed in the previous process is suspended and carried in by a crane (not shown), and the jig pallet 1
Leave on 0.

When a work is placed on the jig pallet 10, an operator connects an auto-coupler to the hydraulic cylinder of the clamp 11 and the pad 12 on the jig pallet 10 and performs positioning on the operation panel.・ Perform the clamp operation. When the mounting state of the work 50 is confirmed, the auto coupler is separated from the jig pallet. While the auto coupler is connected to the jig pallet, an interlock is provided to prevent the next operation.

When the work has been mounted on the jig pallet 10, the operator issues a command to start processing on the operation panel, so that the hydraulic cylinder 22 is actuated first and the receiving disk is raised with the support shaft 21 as a fulcrum. . The work 5 on the jig pallet 10 is set according to a preset program.
0 While the mounting operation is being performed, the work mounting table 3
Is moved to the work transfer position A and is made to stand by. In addition,
Only when the work mounting table 3 is at the work transfer position A, the work can be transferred.

When the work is ready to be received, the ball screw shaft 33 and the traversing means 35 of the transfer device 30 attached to the upper part of the receiving board 20 are driven to operate the traction piece 34, and the engaged cut Rail receiving portion 3 through notch portion 13
1, the jig pallet 10 is moved laterally from the holding surface 23 of the receiving board 20 to the front position of the scale 6 on the work mounting table 3.

The jig pallet 10 by the transfer device 30
Is transported in the notch 1 of the towing piece 34 and the jig pallet 10.
By the actuation of the ball screw shaft 33 and the movement of the traversing means 35 by engagement with the jig 3, the jig pallet 10 is in a state where the upper slide rail 14 is hung on the rail receiver 31 above the receiver 20, and In a state in which the lower guide portion 15 is supplementarily received by the lower roller, as shown by an arrow b in FIG. 6, the guide portion 15 is slid from the receiving board 20 to the front surface of the scale 6 without difficulty.

The jig pallet 10 transferred onto the scale 6
The lifting pin provided on the guide portion 6a provided on the upper part of the scale has a positioning pin 6c (operated by a hydraulic cylinder) attached to the scale 6 and a positioning hole 16 provided on the jig pallet side. Roller 6 with function
It is centered and held by a ', and is also fixed by the attached clamp mechanism 6d. In this state, the jig pallet 10 is clamped on the upper side by the clamp mechanism 6d while the slide rail 14 is hung by the guide portion 6a, as in the case of the receiving board 20, and the lower end is clamped. The balance is adjusted by the operating mechanism 6f that pushes forward, and the balance is stably maintained.

The work 50 mounted on the scale 6 via the jig pallet 10 in this manner is returned to the processing position by turning the work mounting table 3 by 90 °, and the required work is performed based on a preset program. Work 50 in order
Of the front and rear sides and both sides are processed.

Thus, when all the processing of the work 50 is completed, the operation shifts to the work unloading operation. The unloading operation is performed in the reverse order of the loading operation. That is, the work mounting table 3 which has finished the processing is turned by 90 °, returned to the same direction as that at the time of loading, and moves from the processing position to the work transfer position A.

When the work mounting table 3 reaches the work transfer position A, the pulling pieces 34 of the transporting device 30 attached to the receiving board 20 that has been standing up to that point are moved to the scale 6 on the reached work mounting table 3. Is received in the notch 13 of the jig pallet 10 held as it is. Accordingly, the fixing and positioning of the jig pallet 10 by the clamp mechanism 6d attached to the scale, the operation mechanism 6f for pushing the lower end portion forward and the positioning pins 6c are released by a preset program.

Next, the motor 32 of the transfer device 30 and the traversing drive motor 36 of the traversing means 35 are driven in reverse rotation to rotate the ball screw shaft 33 in reverse and to operate the driving rod 35a in reverse, so that the traction piece 34 is moved. The jig pallet 10 for holding the processed work is received on the receiving board 20 by moving the jig pallet 10 on the mounting table 3 from above the scale 6 to the holding surface 23 side of the receiving board 20 and moving it by a required amount.

When the jig pallet 10 is securely received on the holding surface 23 of the receiving plate 20, the hydraulic cylinder 22 is operated to lower the receiving plate 20 to a horizontal state. After being returned to the horizontal state, an auto coupler is connected to the hydraulic controller and the hydraulic piping connection on the jig pallet side to operate each hydraulic device, release the fixation of the work 50, and sling the work 50 to be illustrated. Is carried out to the next process by a crane that is not used.

The operation procedure of the work mounting jig pallet using only one work loading / unloading station 8 has been described above. However, when a large number of works of the same model and type are machined, the left and right work loading / unloading work are performed. Departure station 8,
The work is performed by operating 8 '. in this case,
While the work is being sent from one work loading / unloading station to the processing section and processed as described above, the other work loading / unloading station mounts the work on the jig pallet in the manner described above, and The stand at the position is set to stand by. Then, after the processing of the preceding work is completed, the work is returned to one work loading / unloading station, and the work (jig pallet) waiting while the work is being taken out is sent to the processing section of the machine in the above-described manner. To process. In this way, if the left and right work loading / unloading stations 8, 8 'are alternately operated to feed the work, the work efficiency can be further improved.

In the case where the work is processed using the two work loading / unloading stations 8, 8 'as described above, when the work is fed from one of the work loading / unloading stations to the processing section of the machine, At the other work loading / unloading station, the operation is stopped until the standby state, and the work is interlocked so as not to move to the work transfer position A. When the work mounting table 3 is moved to the work transfer position A to move the jig pallet 10, the operation of receiving or sending out the work (jig pallet) from only one work loading / unloading station is always performed. The other work loading / unloading station is in a standby state. In this way, the work to be handled is processed regularly.

When the jig pallet needs to be replaced due to a change in the type and form of the work to be machined, the receiving plate of the work loading / unloading station is placed in an upright state as described above, and the jig pallet stocker 7 is set on standby. When a replacement command for the tool pallet 10 is issued, first, the accommodating space position of the jig pallet being taken out is moved to the side position of the receiving board, and the holding device 23 provided with the receiving board 20 is actuated. The used jig pallet 10 is sent out and returned into the main body 7a of the jig pallet stocker 7.

Next, the position of the accommodation space for the jig pallet to be used next is selected, and the selected jig pallet moves to the side position of the receiving board 20 to be ready for delivery. Therefore, a new jig pallet is received on the holding surface side of the receiving board 20 by the operation of the extruding mechanism 7B (7B ') and the transfer device 30 in the above-described manner, and is used for the next work processing in the above-described manner. When the pulling piece 34 in the transport device 30 is retracted in the movement axis direction, the engaging claw is turned only at that time to disconnect the notch 13 provided on the jig pallet. It is preferable to incorporate a mechanism that causes the movement.

As described above, according to the present invention, the jig pallet on which the work to be machined is mounted is moved upright and exchanged, so that the moving space can be reduced and the work space can be reduced. Therefore, it can be handled safely and securely. In particular, since the work is made to be horizontal with respect to the jig only during the attachment / detachment operation, the operation can be performed safely and reliably. Further, at the time of moving, even for a large work, the jig pallet is hung and moved in an upright state, so that the driving force required for conveyance can be reduced. Therefore, the object can be achieved by the transfer device attached to the receiving board of the work loading / unloading station as described above, and it is economical.

In the above description, the processing of the revolving frame in the construction machine has been described. However, other workpieces can be similarly prepared by preparing a workpiece corresponding to the shape of the workpiece for processing the jig pallet. It goes without saying that it is possible to carry in and out processing at the processing position of the machining center.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a machining center incorporating a work mounting jig pallet exchange system according to the present embodiment.

FIG. 2 is a side view illustrating an up-and-down state of a holder of a work loading / unloading station.

FIG. 3 is a front view illustrating an example of a jig pallet for mounting a work.

FIG. 4 is a side view showing a cross section of a part where a jig pallet in which a work is mounted on a scale is attached.

FIG. 5 is a partially enlarged side sectional view showing a main part of the scale.

FIG. 6 is a diagram illustrating a transfer device attached to a receiving board of a work loading / unloading station and an operation mode thereof;

FIG. 7 is a side view showing a part of a jig pallet stocker.

FIG. 8 is a perspective view of a work targeted in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machining center 2, 2 'Spindle 3 Work mounting table 6 Scale 6a Scale guide section 6c Positioning pin of scale 6d Clamp mechanism 7 Jig pallet stocker 7a Main body of stocker 7A Storage space 7B, 7B' Pushing mechanism 8, 8 'Work loading Dispensing station 10 Jig pallet 11 Clamp 12 Backing plate 13 Notch 14 Slide rail 15 Guide 17 Waterhole 20 Receiving plate 23 Receiving plate holding surface 30 Transfer device 31 Rail receiving unit 33 Ball screw shaft 34 Traction piece 35 Traverse means 50 Work

Claims (5)

[Claims] A work can be processed by standing and holding a work on a jig pallet at a position in front of a spindle, and the work mounting table is held by holding the jig pallet from the processing position to a work transfer position arranged outside. A work loading / unloading station is provided on the side of the workpiece transfer position with respect to the machining center configured to be able to advance and retreat, and a work loading / unloading station capable of raising and lowering a jig pallet holding a workpiece is provided. A jig pallet stocker is provided, which is capable of holding a plurality of jig pallets corresponding to the work in an upright position and transferring the jig pallet selected by a command to a holder of a work loading / unloading station which stands up. Work is mounted on the jig pallet received from the tool pallet stocker and passed through the work loading / unloading station. A workpiece mounting jig pallet replacement system, wherein the workpiece mounting jig pallet is transferred to the workpiece mounting table. 2. The system according to claim 1, wherein the jig pallet holding surface of the corresponding device is positioned so as to be aligned on the same surface at the work transfer position. 3. The conveying means for transferring the jig pallet hangs the jig pallet on an upper portion of a work mounting table and a holder of a work loading / unloading station at an upper portion, and guides the lower portion by a guide roller. 2. The work mounting jig pallet replacement system according to claim 1, wherein the work mounting jig pallet is configured to be traversed by a pulling piece of a traversing drive device attached to an upper portion of a holding body of the work loading / unloading station. 4. The holder of the work loading / unloading station is provided with a traversing drive device which hangs the jig pallet on the upper portion thereof and can traverse the jig pallet for one stroke, so that it can be raised and lowered by approximately 90 °. 4. The work mounting jig pallet according to claim 1, wherein the jig pallet is held on a front surface thereof so that a work can be mounted on and detached from the jig pallet on the holding surface when it falls down. Exchange system. 5. The system according to claim 1, wherein a notch for selection is provided below the side edge of the jig pallet.