JP2004261829A - Workpiece feeding device in pressing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece feeding device in a pressing machine, wherein costs are reduced by simplification and reduction of the size of a constitution, and flexibility of motion patterning and productivity are improved. <P>SOLUTION: The workpiece feeding device is provided with: a guide bar 11 extended in a workpiece feeding direction T; a feed carrier 12 to be moved along the guide bar 11 by a moving means; and a crossbar 14 to support a workpiece W through a vacuum cup 15 to hold the workpiece W to be freely detachable. The feed carrier 12 is constituted to be provided with the crossbar 14 through a subcarrier 13 to be elevation-driven by an elevating means. <P>COPYRIGHT: (C)2004,JPO&NCIPI

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 the one proposed by the present applicant in Patent Document 1, as shown in FIG. 6, 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. Further, when the weight of the lift movable member 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 transport direction, a feed carrier moved by a moving means along the guide bar, and a crossbar supporting the work via work holding means for detachably holding the work,
The crossbar is provided on the feed carrier via an elevating means (first invention).
[0008]
In the present invention, the loading / unloading operation of the workpiece with respect to the processing position is performed by combining the movement of the feed carrier in the work transport direction by the moving means, that is, the movement of the crossbar in the feed axis direction, and the movement of the crossbar in the lift axial direction by the lifting / lowering means. Is performed. According to the present invention, the movement of the crossbar in the lift axis direction is performed by directly driving the crossbar up and down by the lifting means interposed between the feed carrier and the crossbar, so that the weight of the movable body is reduced. The simplification and downsizing of the device configuration can be achieved by the drastic reduction, and the effect of reducing costs can be achieved. Also, by controlling the driving of the moving means and the elevating means respectively, the motion of the crossbar can be set arbitrarily. For example, in a transfer press, the feed is adjusted so as to correspond to each processing station (and idle station). By arranging the crossbar via the carrier and the lifting / lowering means, it is possible to set an optimal motion pattern relating to the loading / unloading operation of the work for each station, and it is possible to significantly improve the degree of freedom as compared with the related art. . Furthermore, since the driving object of the lifting / lowering means is a relatively lightweight crossbar and the inertia is small, the lifting / lowering means can sufficiently follow the speed even if the transfer speed of the work transfer device is increased, and the productivity can be improved.
[0009]
In the first invention, it is preferable that the moving means and / or the elevating means use 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 each of the above inventions, it is preferable that an evacuation lift device that raises the guide bar to at least a position not interfering with the mold when exchanging the mold is provided (third invention). This has the effect that the mold can be easily replaced. Further, even when it is necessary to adjust the height position of the guide bar depending on the type of the work, the processing method, or the size of the mold, there is an effect that the height can be appropriately adjusted by using the evacuation lift device. .
[0011]
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.
[0012]
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. FIG. 3 is an enlarged view of a portion A in FIG. 2, and FIG. 4 is a view taken in the direction of arrows BB in FIG.
[0013]
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.
[0014]
As shown in FIGS. 3 and 4, the work transfer device 10 includes a pair of guide bars 11 arranged side by side along the work transfer direction T, and each of the stations S ₁ , I ₁ , S ₂ , S ₃ , a plurality of feed carrier 12 that is mounted to, the guide bar 11 at intervals in the workpiece conveying direction T so as to correspond to S _4, the sub-carrier 13 to be attached to each feed carrier 12, the sub-carriers to be opposed to each other A crossbar 14 is provided between the crossbars 13 so as to be orthogonal to the work transfer direction T. The vacuum cup 15 (work holding means: see FIG. 2) attached to the crossbar 14 sucks and transfers the work W. It is configured as follows.
[0015]
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 having a lower end 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. .
[0016]
Each feed carrier 12 mounted on each of the guide bars 11 is supported by linear guides 19, 19 so as to guide the movement of the guide bar 11 in the longitudinal direction. Further, a linear motor 20 is arranged between the guide bar 11 and the feed carrier 12. The linear motor 20 has a magnet 20a attached to the inner side surface (the center side surface of the transfer press 1) of the guide bar 11 along the longitudinal direction of the guide bar 11, and the linear motor 20 is mounted on the feed carrier 12 in a position opposed to the magnet 20a. The magnetic field generated on the stator (guide bar 11) having the magnet 20a includes a coil 20b attached to the armature (feed carrier 12) having the coil 20b. Propulsion is provided. 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 drive mechanism including the linear guides 19, 19 and the linear motor 20 corresponds to the "moving means" of the present invention.
[0017]
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, for example, by arranging the feed carrier below the guide bar. is there. 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. Further, instead of a driving mechanism including a linear guide and a linear motor, a driving mechanism including a servo motor and a ball screw slider mechanism described later may be employed. Further, a drive mechanism including a servomotor, a rack and pinion mechanism, and the like may be employed.
[0018]
The sub-carrier 13 mounted on each of the feed carriers 12 is supported by linear guides 21 and 21 so as to guide the movement in the vertical direction, and is linearly guided by a ball screw 23 driven by a servo motor 22. A linear motion is made on the components 21 and 21 (a so-called ball screw slider mechanism). In this way, the sub-carrier 13 is moved up and down by driving the servo motor 22, and the driving of the servo motor 22 is controlled by well-known control means, so that the movement of the cross bar 14 in the lift axis direction can be set arbitrarily. I have. The drive mechanism including the servo motor 22 and the ball screw slider mechanism corresponds to the "elevating means" of the present invention. Further, instead of this driving mechanism, a driving mechanism including the above-described linear guide and linear motor can be employed.
[0019]
A support device 24 having a rod portion 24a that fits into a hole formed in the end surface of the cross bar 14 is mounted on the subcarrier 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, the subcarrier 13 is provided with a tilt device for more smoothly and surely carrying in / out the work W to / from the processing position. The tilt device includes a servomotor 25 and a transmission mechanism 26 such as a toothed belt for transmitting the rotational force of the servomotor 25 to the rod portion 24a. The crossbar is driven by the servomotor 25 via the rod portion 24a. The work W is rotated about its long axis to tilt the work W in the vertical direction. Further, in this tilt device, when the mold is replaced, the crossbar 14 provided with the vacuum cup 15 is placed on the moving bolster 6 together with the mold and carried out of the press device. It is rotated 90 degrees to avoid interference with the mold and upright. If it is not necessary to tilt the work W in the vertical direction, a rotary actuator may be used instead of the servo motor 25.
[0020]
Each of the linear motor 20 and the servo motor 22 is provided with a linear encoder and / or a rotary encoder (both not shown) as a position detector for detecting a current position, and a position signal detected by these position detectors is provided. The data is input to a work transfer device controller (not shown) 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.
[0021]
In the work transfer device 10 of the present embodiment configured as described above, the movement of the feed carrier 12 in the feed axial direction of the feed carrier 12 moved along the work transfer direction T (feed direction) by the operation of the linear motor 20. The movement of the workpiece W to / from the stations S ₁ , I ₁ , S ₂ , S ₃ , and S ₄ is performed by combining the movement of the sub-carrier 13 with the lift axis direction movement of the subcarrier 13 that is driven up and down by the operation of the servo motor 22. Such a motion pattern is performed. FIG. 5 shows an example of this motion pattern by a solid 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.
[0022]
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, since the movement of the crossbar 14 in the lift axis direction is performed by directly driving the crossbar 14 up and down, the weight of the movable body is greatly reduced, so that the apparatus configuration can be simplified and downsized, and the cost can be reduced. Is achieved. Further, since the transfer speed of the work transfer device 10 can be increased, there is an effect that productivity can be improved.
[0023]
In the present embodiment, an example in which the present invention is applied to a normal transfer press has been described. Of course, the present invention can be applied to a so-called module transfer press in which an upright is shared between processes.
[0024]
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 an enlarged view of a portion A in FIG. 2;
FIG. 4 is a view taken in the direction of arrows BB 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 structural explanatory view of a conventional work transfer device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transfer press 10 Work transfer device 11 Guide bar 12 Feed carrier 13 Subcarrier 14 Cross bar 15 Vacuum cup 16 Evacuation lift device 20 Linear motor 22 Servo motor T Work transfer direction W Work

Claims (3)

A guide bar extending in the work transport direction, a feed carrier moved by a moving means along the guide bar, and a crossbar supporting the work via work holding means for detachably holding the work,
A work transfer device for a press machine, wherein the crossbar is provided on the feed carrier via a lifting unit. The work transfer device for a press machine according to claim 1, wherein the moving unit and / or the elevating unit uses a linear motor or a servomotor as a driving source. 3. The work transfer device according to claim 1, further comprising a retraction lift device that raises the guide bar to at least a position where the guide bar does not interfere with the mold when exchanging the mold. 4.

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