JP2004261830A - Work transfer device for press machine - Google Patents

Abstract

[PROBLEMS] To provide a work transfer device for a press machine capable of reducing costs by simplifying the structure and reducing the size, improving the degree of freedom of a motion pattern, and improving productivity.
A guide bar (11) extending in a work transfer direction (T), a feed carrier (12) moved by a moving means along the guide bar (11), and a swing supported in the work carrier (T) supported by the feed carrier (12). A swing lever 13 to be moved, and a crossbar 14 for supporting the work W via a vacuum cup 15 for detachably holding the work W, wherein the cross bar 14 is provided on the swing lever 13. I do.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device in a press machine for loading and unloading a work to be processed into and out of a processing position in conjunction with press processing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, transfer presses and the like are provided with a work transfer device for loading and unloading a work to be processed into and out of a processing position in conjunction with continuous multi-step pressing. As such a work transfer device, for example, in a device proposed by the present applicant in Patent Document 1, as shown in FIG. 8, a pair of lift beams 101 arranged side by side in a work transfer direction T, A plurality of crossbar carriers 102 that are movably supported at intervals in the work transport direction T with respect to the lift beam 101, and are horizontally mounted between the crossbar carriers 102 facing each other so as to be orthogonal to the work transport direction T. The work (all not shown) is suctioned and transported by a vacuum cup attached to the crossbar 103.
[0003]
[Patent Document 1]
JP-A-6-262280
The work transfer apparatus 100 has a structure in which a lift beam 101 is suspended from above through a lift mechanism using a servomotor 104 as a drive source. The crossbar carriers 102 adjacent to each other in the work transport direction T are connected by a connecting rod 105, and the crossbar carrier 102 located at the most downstream position is connected to the distal end of a cam lever 107 via a connecting rod 106. . The cam lever 107 is in contact with a feed cam 108 which is rotated by power taken out of the press body. Then, the lift beam 101 is moved in the vertical direction by the operation of the servo motor 104, and the cam lever 107 is swung by the rotation of the feed cam 108, so that all the crossbar carriers 102 are simultaneously moved in the workpiece transfer direction T. Reciprocating drive. In this way, the work is sequentially transferred to each processing station by the motion of the crossbar 103 due to the combined movement in the vertical direction and the work transfer direction T.
[0005]
[Problems to be solved by the invention]
However, in the work transfer apparatus 100, since all the crossbar carriers 102 are simultaneously driven by a driving unit that is a combination of a cam mechanism and a link mechanism, the driving system is heavy and complicated, and the There is a problem that there is a restriction in setting an optimal motion pattern for the image, and the degree of freedom is low. Further, when the cross bar 103 is moved up and down, it is necessary to move the entire lift beam 101 up and down. Therefore, the servo motor 104 becomes large, the whole apparatus becomes large, and the cost is unavoidable. There are points. Furthermore, if the lift movable weight is heavy, the inertia force increases, and it becomes difficult to increase the transfer speed of the work transfer device. Therefore, there is a problem that productivity cannot be increased.
[0006]
The present invention has been made in order to solve such a problem, and it is possible to reduce the cost by simplifying the configuration and reducing the size, to improve the degree of freedom of the motion pattern, and to improve the productivity. It is an object of the present invention to provide a work transfer device in a press machine that can be used.
[0007]
[Means for Solving the Problems and Functions / Effects]
In order to achieve the above object, a work transfer device in a press machine according to the present invention includes:
A guide bar extending in the work transfer direction, a feed carrier moved by moving means along the guide bar, an oscillating body supported by the feed carrier and oscillated in the work transfer direction, A crossbar that supports the work via work holding means that freely holds the work,
The swing bar is provided with the crossbar (first invention).
[0008]
In the present invention, by moving the feed carrier along the guide bar by the moving means, the crossbar is moved in the feed axis direction (work transfer direction). The crossbar is moved in the feed axis direction and the lift axis direction by the swinging motion of the swinging body. The work of loading and unloading the work to and from the processing position is performed by the motion of the crossbar formed by combining the feed axial movement and the lift axial movement. According to the present invention, the movement of the crossbar in the lift axis direction is performed by directly moving the crossbar up and down by the swinging motion of the swinging body. The size can be reduced and the cost can be reduced. Further, by controlling the oscillating motion of the moving means and the oscillating body, the motion of the crossbar can be set arbitrarily. For example, in a transfer press, it is possible to correspond to each processing station (and idle station). By arranging a crossbar via a feed carrier and a rocking body, it is possible to set the optimal motion loading / unloading motion pattern for each station, significantly improving the degree of freedom as compared to the past. Can be. Further, since the object to be driven by the oscillator is a relatively light crossbar and has a small inertia, the oscillator can sufficiently follow the operating speed of the work transfer device even when the operating speed is increased, and the productivity can be improved.
[0009]
In the first invention, it is preferable that the moving means uses a linear motor or a servomotor as a drive source (a second invention). In this way, the motion pattern can be easily set. In particular, when a linear motor is used, a direct drive system is used without the need for a power transmission mechanism such as gears. Therefore, there is an effect that the structure is extremely simplified and maintenance-free can be achieved.
[0010]
In the first invention or the second invention, it is preferable that tilt means is provided for tilting the work in the vertical direction by rotating the crossbar around its long axis (third invention). When such a tilting means is provided, the work is tilted up and down by the tilting means so as to cancel the inclination of the work inevitably caused by the swinging movement of the rocking body. Accordingly, the work can be kept horizontal, so that there is an effect that the work loading / unloading operation with respect to the processing position can be performed more smoothly and reliably.
[0011]
In the first to third inventions, it is preferable that an evacuation lift device for raising the guide bar to at least a position not interfering with the mold when exchanging the mold is provided (fourth invention). This has the effect that the mold can be easily replaced. In addition, even when it is necessary to adjust the height position of the guide bar depending on the type of the workpiece, the processing direction, or the size of the mold, there is an effect that the height can be adjusted appropriately by using the evacuation lift device. is there.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a specific embodiment of a work transfer device in a press machine according to the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is an overall schematic front view of a transfer press according to an embodiment of the present invention, and FIG. 2 is a side view of the transfer press.
[0014]
The transfer press 1 according to the present embodiment includes a crown 2, a slide 3, and a bed 4. In the transfer press 1, the crown 2, the upright 5, and the bed 4 are integrated by a tie rod (not shown), and are opposed to the upper die (not shown) attached to the lower surface of the slide 3. Press molding is performed between the lower dies 7 on the moving bolster 6 provided as described above. Further, required processing stations S ₁ , S ₂ , S ₃ , S ₄ and an idle station I ₁ are provided corresponding to the process specifications. Then, the work W is sequentially transferred to each of the stations S ₁ , I ₁ , S ₂ , S ₃ , and S ₄ by the work transfer device 10 described in detail later in conjunction with the press working operation, so that a desired pressed work product is obtained. Have been able to get.
[0015]
Next, the structure of the work transfer device 10 will be described in detail with reference to FIGS. FIG. 3 is a front view of a main part for explaining the structure of the work transfer device. FIG. 4 shows an AA view (a) and a B arrow view (b) in FIG. 3, respectively. Since the work transfer device 10 of the present embodiment is symmetrical in the left and right directions with respect to the work transfer direction T, FIG. 3 shows only the right portion of the work transfer device 10 for convenience of explanation. .
[0016]
The work transfer device 10 includes a pair of guide bars 11 arranged in parallel along the work transfer direction T, and a work transfer direction T corresponding to each of the stations S ₁ , I ₁ , S ₂ , S ₃ , and S _4. A plurality of feed carriers 12 mounted on the guide bars 11 at intervals, a swing lever (swing body) 13 attached to each feed carrier 12, and a work The cross bar 14 is provided so as to be orthogonal to the transport direction T, and the vacuum cup 15 (work holding means) attached to the cross bar 14 sucks and transports the workpiece W.
[0017]
Each of the guide bars 11 extends over the entire length inside the transfer press 1 and is suspended from above by an evacuation lift device 16 attached to each of the uprights 5. Here, the evacuation lift device 16 has a suspension rod 17 whose lower end is fixed to the upper surface of the guide bar 11, and a pinion (not shown) that meshes with a rack provided on the suspension rod 17. Is rotated by a motor 18 to move the guide bar 11 up and down. In this embodiment, the guide bar 11, at the time of press working are disposed at a predetermined height position suitable for performing work transfer (height shown in Figure 1 Symbols H ₁ position). Further, when the mold is replaced, the upper and lower molds are placed on the moving bolster 6 and carried out of the press device. Therefore, at the time of mold replacement, the guide bar 11 does not interfere with the mold by the evacuation lift device 16. It is raised to a position (height position shown in FIG symbols H _2). Thus, the mold can be easily exchanged. The evacuation lift device 16 is not limited to the rack-pinion type mechanism described above, and may employ a screw type elevating mechanism, a type that moves up and down by expansion and contraction of a hydraulic or pneumatic cylinder, and the like. .
[0018]
Each feed carrier 12 mounted on each of the guide bars 11 is supported by a linear guide 19 so as to guide the movement of the guide bar 11 in the longitudinal direction. In addition, a pair of linear motors 20 are arranged between the guide bar 11 and the feed carrier 12. Each linear motor 20 is constituted by a magnet 20a attached to the side surface of the guide bar 11 along the longitudinal direction of the guide bar 11, and a coil 20b attached to the feed carrier 12 in a position facing each magnet 20a. Then, a change in the magnetic field generated on the stator (guide bar 11) having the magnet 20a applies a propulsive force in the longitudinal direction of the guide bar 11 to the armature (feed carrier 12) having the coil 20b. ing. In this manner, the feed carrier 12 is moved in the longitudinal direction (conveying direction) of the guide bar 11 by driving the linear motor 20, and the driving of the linear motor 20 is controlled by a well-known control unit, so that the feed of the cross bar 14 is controlled. The axial movement can be set arbitrarily. In the present embodiment, the linear motor 20 is employed as the drive source and the direct drive method is employed, thereby simplifying the structure and making the maintenance free. Note that a driving mechanism including the linear guide 19 and the linear motor 20 corresponds to the “moving means” of the present invention.
[0019]
Here, the relative position of the feed carrier 12 with respect to the guide bar 11 is not limited to that exemplified in the present embodiment, and the relative position can be set as appropriate. Further, as long as the guide bar can guide the guide bar in the longitudinal direction and apply a propulsive force in the guide direction, the arrangement of the linear guide and the linear motor can be freely set. Instead of a drive mechanism including a linear guide and a linear motor, a drive mechanism including a well-known ball screw slider mechanism and a rack and pinion mechanism using a servo motor as a drive source may be employed.
[0020]
The base end of the swing lever 13 is pivotally attached to the feed carrier 12, and the rotational force of a servomotor 22 is input to a pivot 21 via a gear transmission mechanism 23. Thus, the swing lever 13 is swung in the work transport direction T by the drive of the servo motor 22. The output shaft of the servomotor 22 may be directly connected to the pivot shaft 21 of the swing lever 13 without using the gear transmission mechanism 23. Also, as shown in FIG. 6 (the same reference numerals are given to the same or similar components as the work transfer device 10 of the present embodiment), the linear operation is performed by oil / air pressure or electric energy. A structure in which the swing lever 13A is driven to swing by the cylinder 30 is also possible.
[0021]
A support device 24 having a rod portion 24 a that fits into a hole formed in the end surface of the cross bar 14 is mounted on the tip of the swing lever 13. The support device 24 is configured such that the rod portion 24a expands and contracts in the axial direction by operation of an air pressure supply device (not shown). Thus, the attachment and detachment of the crossbar 14 can be easily performed with a so-called one-touch operation. Further, a tilt device (tilt means) 25 for tilting the work W is provided at a tip end of the swing lever 13. The tilt device 25 includes a servomotor 26 with a built-in speed reducer connected to an output shaft of the rod portion 24a. By the operation of the servomotor 26, the crossbar 14 is moved around its long axis via the rod portion 24a. It is configured to rotate and tilt the work W in the vertical direction. In the present embodiment, the tilt position of the work W is tilted by the tilt device 25 so as to cancel the tilt of the work W caused by the swinging movement of the swing lever 13, and the work W is kept horizontal, so that the processing position is maintained. The operation of loading and unloading the workpiece W with respect to the workpiece is performed more smoothly and reliably. In addition, at the time of mold replacement, the crossbar 14 is rotated 90 degrees by the tilt device 25 in order to place the crossbar 14 provided with the vacuum cup 15 together with the mold on the moving bolster 6 and carry it out of the press device. It is designed to avoid interference with molds and uprights.
[0022]
Each of the linear motor 20 and the servomotors 22 and 26 is provided with a linear encoder and / or a rotary encoder (both not shown) as a position detector for detecting a current position. The signal is input to a controller (not shown) for the work transfer device related to the control of the work transfer device 10. On the other hand, in the controller for the work transfer device, the work position is input based on the current position information input from the position detectors and the current position information of the slide 3 input from the press controller that controls the operation of the transfer press 1. A motion pattern related to the loading / unloading operation of W is performed in conjunction with the press working.
[0023]
In the work transfer device 10 of the present embodiment configured as described above, the feed carrier 12 is moved along the guide bar 11 by the operation of the linear motor 20, whereby the crossbar 14 is moved in the feed axis direction (workpiece direction). It is moved in the transport direction T). On the other hand, the operation of the servo motor 22 causes the swing lever 13 to swing in the work transfer direction T, whereby the crossbar 14 is moved in the feed axis direction and the lift axis direction. Then, a motion pattern relating to the loading / unloading operation of the workpiece W to / from each of the stations S ₁ , I ₁ , S ₂ , S ₃ , and S ₄ is performed by combining the feed axial movement and the lift axial movement. FIG. 5 shows an example of this motion pattern by a two-dot chain line indicated by a symbol M in the figure. In this example, after the workpiece W is lifted is adsorbed from the lower mold of the preceding processing stations S ₂ at adsorption points P in the Z axis direction, the X-axis direction until the lower mold of the subsequent processing station S ₃ The workpiece W is conveyed, lowered in the Z-axis direction to enter the lower mold, and the suction of the work W is released at the release point Q. Next, after once lifted upward to return to the preceding processing station S _2, through the standby point R of downward to be vertically again returned to the suction point P, 1 cycle is completed. When the swing lever 13 swings, the feed shaft direction movement is generated together with the lift axial direction movement, and the movement may be compensated for by the feed axial direction movement of the feed carrier 12. That is, a motion obtained by adding the motion of the cross bar 14 in the feed axis direction to the motion of canceling the motion in the feed axis direction caused by the swing of the swing lever 13 is defined as the motion of the feed carrier 12 in the feed axis direction. (See FIG. 5).
[0024]
According to the present embodiment, since the motion of each crossbar 14 can be set arbitrarily, optimal loading / unloading operation of the workpiece W for each of the stations S ₁ , I ₁ , S ₂ , S ₃ , and S _4. Such a motion pattern can be set, and the degree of freedom can be significantly improved as compared with the related art. In addition, the movement of the crossbar 14 in the lift axis direction is performed by directly driving the crossbar 14 up and down by the swinging movement of the swinging lever 13, so that the weight of the movable body is greatly reduced, thereby simplifying the apparatus configuration. The size can be reduced and the cost can be reduced. Further, since the operation speed of the work transfer device 10 can be increased, there is an effect that productivity can be improved.
[0025]
In the present embodiment, an example in which the present invention is applied to a normal transfer press is shown. However, other forms of press, such as a crown, a slide, and a bed for each process, are modularized as a set. Of course, it is also possible to apply the present invention to a so-called module transfer press in which an upright is shared between processes.
[0026]
In the case where the motion in the feed axis direction in each crossbar 14 may be the same, FIG. 7 (the same reference numerals are given to the same or similar components as those according to the present embodiment and the related art). ), A work transfer apparatus 10B in which all the feed carriers 12B, 12B,... Simultaneously reciprocated by the conventional cam lever 107 are combined with the swing lever 13 of the present embodiment. There may be some embodiments. With such an embodiment, the size of the device can be reduced.
[0027]
Further, in place of the work supporting means such as the crossbar 14, a cantilevered finger type or a cantilevered cup type work supporting means can be employed.
[Brief description of the drawings]
FIG. 1 is an overall schematic front view of a transfer press according to an embodiment of the present invention.
FIG. 2 is a side view of a transfer press.
FIG. 3 is a main part front view for explaining the structure of the work transfer device.
FIG. 4 is a view (a) viewed from AA and a view (b) viewed from arrow B in FIG. 3;
FIG. 5 is a diagram illustrating an example of a motion pattern related to a work loading / unloading operation.
FIG. 6 is a diagram illustrating another mode of the swing drive mechanism.
FIG. 7 is a front view illustrating a main part of a work transfer device according to another embodiment.
FIG. 8 is a structural explanatory view of a conventional work transfer device.
[Explanation of symbols]
Reference Signs List 1 transfer press 10 work transfer device 11 guide bar 12 feed carrier 13 rocking lever (rocking body)
14 Cross bar 15 Vacuum cup 16 Evacuation lift device 20 Linear motor 22, 26 Servo motor 25 Tilt device T Work transfer direction W Work

Claims (4)

A guide bar extending in the work transfer direction, a feed carrier moved by moving means along the guide bar, a rocking body supported by the feed carrier and swinging in the work transfer direction, A crossbar that supports the work via work holding means that freely holds the work,
A work transfer device for a press machine, wherein the swing bar is provided with the crossbar. 2. The apparatus according to claim 1, wherein the moving unit uses a linear motor or a servomotor as a driving source. 3. The work transfer device according to claim 1, further comprising a tilt unit that tilts the work in a vertical direction by rotating and driving the crossbar around its long axis. 4. The work transfer device for a press machine according to any one of claims 1 to 3, further comprising an evacuation lift device for raising the guide bar to at least a position where the guide bar does not interfere with the mold when exchanging the mold.

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