JP4778698B2 - Work transfer device for press machine - Google Patents

Description

  The present invention relates to a work transfer device for a press machine.

FIG. 18 shows a transfer press 100 which is a conventional press, and four columnar uprights 121 are erected on a bed 123 located under the press frame 110, and a crown 120 is installed on the upper surface of the upright 121. Yes. The crown 120 has a built-in slide drive device, and drives the slide 122 positioned below the crown 120 up and down. An upper mold 112 is attached to the lower surface of the slide 122. A lower mold 113 is installed on the upper surface of the moving bolster 130 facing the slide 122, and the workpiece is press-molded by the cooperation of the upper mold 112 and the lower mold 113. A pair of left and right transfer bars 114 are extended in parallel with the upper mold 112 and the lower mold 113 interposed therebetween. The pair of transfer bars 114 and 114 are provided with fingers (not shown) for holding a workpiece (not shown) opposite to each other, and the transfer bars 114 and 114 are appropriately reciprocated in the feed direction, the lift direction, and the clamp direction. Thus, the workpiece is sequentially transferred from the lower mold 113 on the upstream side (left direction in FIG. 18) to the lower mold 113 on the downstream side (right direction in FIG. 18). The feed direction is parallel to the workpiece conveyance direction, and the movement in the feed direction includes advance (movement from the upstream side to the downstream side) and return (movement from the downstream side to the upstream side). Further, the lift direction is a vertical direction, and the movement in the lift direction includes a lift (movement from the bottom to the top) and a down (movement from the top to the bottom). Further, the clamping direction is a direction perpendicular to the feed direction (a direction perpendicular to the paper surface of FIG. 18). The movement in the clamping direction includes clamping (movement for narrowing the interval between the transfer bars 114) and unclamping (transferring). There is a movement to widen the interval between the bars 114).
For example, in the case of a three-dimensional transfer feeder, the transfer bar 114 sequentially transfers the workpiece onto the lower mold 113 on the downstream side by repeating clamp, lift, advance, down, unclamp, and return.

A feed driving unit 115 that moves the transfer bar 114 in the feed direction is fixed to the upstream side or the downstream side surface of the press frame 110. The clamp driving unit 116 that moves the transfer bar 114 in the clamping direction and the lift driving unit 117 that moves the transfer bar 114 in the lifting direction are between the two uprights 121 on the upstream side and the downstream side, and on the bed 123. Is installed.
In the feed driving unit 115, the clamp driving unit 116, and the lift driving unit 117, the feed cam, the clamp cam, and the lift cam are rotated by the rotational power extracted from the press body, respectively, and the transfer bar 114 is fed in the feed direction by these cams. It is driven in the three-dimensional direction of the clamp direction and the lift direction.

  However, in recent years, in the case of driving in the feed direction, the clamping direction, and the lift direction with such a cam, when the motion pattern of the transfer bar 114 is made variable, a plurality of cams are required according to the motion pattern. Is complicated and expensive, and is limited by a motion pattern that can be varied depending on the number of cams. For this reason, it is desired to easily obtain various motion patterns and to simplify the drive mechanism.

In view of this, there has been proposed a workpiece transfer device that controls the servo motor by using the feed driving unit 115, the clamp driving unit 116, and the lift driving unit 117 as servo motors.
The servo motor driven feed driving unit 115, clamp driving unit 116, and lift driving unit 117 are configured as follows. The feed drive unit 115 is provided with a ball screw mechanism using a first servo motor as a drive source, and reciprocates the transfer bar 114 in the feed direction. The clamp drive unit 116 is provided with a ball screw mechanism that uses a second servo motor as a drive source, reciprocates the transfer bar 114 in the clamp direction, and the lift drive unit 117 uses a third servo motor as a drive source. A rack and pinion mechanism is provided to reciprocate the transfer bar 114 in the lift direction.

  In addition, as disclosed in Patent Document 1, there is a technique in which a feed operation, a clamp operation, and a lift operation of a feed bar are all performed by a linear motor. In this workpiece transfer apparatus, the feed bar is suspended from a bracket fixed to the press body. A linear motor is provided between the bracket and the feed bar, and the feed bar moves in the feed direction with respect to the bracket to perform an operation in the feed direction. The clamping operation and the lifting operation are each driven by a linear motor provided on the lower surface of the feed bar.

  Further, as shown in Patent Document 2, a first bracket is provided on a fixed bar so as to be lifted by a linear motor, and a second bracket is provided on the first bracket so as to be clamped by a linear motor. Some brackets have a third bracket provided with a workpiece holder so as to be fed by a linear motor.

  Moreover, as shown in Patent Document 3, a pair of lift beams provided parallel to the workpiece transfer direction and freely movable up and down, and each lift beam can be moved by a linear motor along the longitudinal direction of the lift beam. A workpiece holding means is provided in a horizontal manner between a provided carrier, a subcarrier that can be moved by a linear motor in a carrier moving direction along a guide provided on the carrier, and a pair of subcarriers facing each other. Some have a crossbar. In this work transfer device, a lift operation is performed by moving a lift beam with a servo motor. Further, the feed operation is performed by moving the carrier and the subcarrier in the feed direction with a linear motor. By using carriers and subcarriers, the movable range in the feed direction can be widened.

Japanese Patent Laid-Open No. 10-314871 (page 4, FIG. 5) Japanese Patent Laid-Open No. 11-104759 (pages 2 and 3, FIGS. 3 and 4) JP2003-205330A (5th page, FIG. 5)

However, in the conventional transfer press as shown in FIG. 18, a feed box incorporating a feed driving unit 115 is installed on the side of the press main body, and a lift box or clamp incorporating a lift driving unit 117 between the left and right uprights 121. Since the clamp box incorporating the drive unit 116 is installed, the structure of the drive mechanism is complicated, and the manufacturing cost is increased.
In addition, the feed box containing the feed drive unit 115 protrudes outward from the side surface of the press main body, which obstructs the installation of the material supply device or the workpiece carry-out device, and requires a large installation space as a press line. There is a problem of becoming.

  Moreover, since the thing shown in patent document 1 drives the whole feed bar to a feed direction, the total drive weight will become large. For this reason, in order to follow the production speed of a press, a drive source with a large capacity is required, resulting in an increase in manufacturing cost.

  Further, in the device disclosed in Patent Document 2, since the third bracket is provided on the second bracket so that the third bracket is fed by a linear motor, it is necessary to increase the feed direction length of the second bracket in order to secure the feed distance. There is. As a result, the second bracket becomes large and heavy, but the second bracket must be clamped with respect to the first bracket. In addition, the first bracket holding the second bracket must be lifted with respect to the fixed bar. Therefore, the drive mechanism for the clamp operation and the lift operation requires a linear motor with a large capacity, which also increases the manufacturing cost.

Moreover, although what is shown in Patent Document 3 can widen the movable range in the feed direction, a carrier provided so as to be movable by a linear motor and a subcarrier provided so as to be movable by a linear motor are required. For this reason, the number of linear motors for feeding workpieces increases, the structure becomes complicated, and the manufacturing cost increases.
As described above, the effect of simplification of the structure is not sufficient even by the servo motor drive and other countermeasures, and the demand for further simplification of the structure and cost reduction is high.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a work transfer device for a press machine capable of simplifying the structure.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a pair of workpieces supported by frames disposed on both sides of a moving bolster in a workpiece conveying direction and parallel to the workpiece conveying direction. Bar, a feed carrier supported by the bar, a feed driving mechanism for driving the feed carrier in the workpiece conveyance direction, a base supported by the feed carrier, a feed carrier and a base A lift drive mechanism that moves the plate up and down in the lift direction, a workpiece holder that is detachably provided on the base, holds the workpiece, and is provided on the frame, and is adjusted separately from the press working on the press machine. running when working with a bar spacing adjustment apparatus for adjusting the distance between the pair of bars, a pair of bars When the moving bolster moves from the press main body of the press machine, it is configured to be divided into a fixed bar fixed to the bar interval adjusting device and a moving bar placed on a bar support provided in the moving bolster, The feed carrier is supported by a moving bar, and a work holder for a plurality of steps is detachably provided on the base .

  According to a second aspect of the present invention, there is provided the work conveying apparatus for the press machine according to the first aspect, further comprising a clamp driving mechanism that is provided on the feed carrier and that drives the base in a clamping direction orthogonal to the workpiece conveying direction. .

According to a third aspect of the present invention, in the work transfer device for the press machine according to the first or second aspect, at least one of the feed drive mechanism and the lift drive mechanism includes a linear motor.
According to a fourth aspect of the present invention, in the work transfer device for the press machine according to the second aspect, the clamp driving mechanism includes a linear motor.

According to a fifth aspect of the present invention, in the workpiece transfer device for the press machine according to the first or second aspect, at least one of the feed driving mechanism and the lift driving mechanism includes a servo motor.
According to a sixth aspect of the present invention, in the workpiece transfer device for the press machine according to the second aspect, the clamp driving mechanism includes a servo motor.

In a seventh aspect of the present invention, in the work transfer device of the press machine according to any one of the first to sixth aspects, the bar supports a plurality of feed carriers, and each feed carrier can be independently controlled for movement. It is comprised by this.
According to an eighth aspect of the present invention, in the work transfer device of the press machine according to any one of the first to sixth aspects, a plurality of feed carriers are supported on the bar, and adjacent feed carriers are connected by connecting means. It is characterized by .

According to the first invention, the feed carrier is driven by the feed driving mechanism, and moves in the workpiece conveyance direction with respect to the pair of bars. The base is driven by a lift drive mechanism and moves in the lift direction with respect to the feed carrier. By these moving operations, the workpiece transfer device can move at least two-dimensionally in the workpiece transfer direction and the lift direction.
Since the feed carrier moves in the workpiece conveyance direction with respect to the bar, the movable range of the feed carrier in the workpiece conveyance direction is widened. Further, since the movement distance in the normal lift direction is smaller than the movement distance in the workpiece conveyance direction, the length of the feed carrier in the lift direction is reduced. Accordingly, the feed carrier is small and light, and a feed driving mechanism and a lift driving mechanism having a small capacity can be adopted. These feed driving mechanism and lift driving mechanism can be arranged on the bar and on the feed carrier. .
Therefore, unlike the conventional case, a feed box having a built-in feed driving unit is not required, and the feed box does not protrude from the press body, and the entire press machine becomes compact. And since a feed box does not protrude, it also becomes possible to arrange | position a workpiece carrying-out apparatus etc. in the vicinity of a press machine. In addition, a lift box having a built-in lift drive unit, which is conventionally installed between the uprights together with the feed box, becomes unnecessary, and the structure of the workpiece transfer device is simplified.
In addition, since the bar interval adjusting device is provided, the bar interval can be optimally set according to the mold. In addition, when the workpiece transfer device is equipped with a clamp drive mechanism, when determining the maximum travel distance of the clamp drive mechanism, it is not necessary to add the bar distance dimension to the maximum travel distance (maximum clamp amount). The maximum moving distance of the drive mechanism can be kept short. Thereby, weight reduction of a base can be achieved.
In addition, since a work holder for a plurality of steps is provided on one base, for example, in a transfer press having a plurality of processing steps, the number of lift carriers and clamp carriers that move together with the feed carrier is determined. Since it can be reduced, cost reduction is promoted. This also simplifies the structure and control.
Further, since the bar is configured to be detachable from the frame, the bar can be removed and placed on the moving bolster when the mold is exchanged, and moved to the outside of the workpiece transfer area together with the moving bolster. This also facilitates the exchange of the work holder and facilitates the mold exchanging work .

Here, the lift direction refers to a direction perpendicular to a plane including a pair of bars.
In addition, the feed drive mechanism is arranged on the bar as a direct arrangement such as being attached to the feed drive mechanism bar, or indirectly via a member attached to the bar. No matter what.
Further, the lift drive mechanism is arranged on the feed carrier as a direct arrangement such as when the lift drive mechanism is attached to the feed carrier, or indirectly through a member attached to the feed carrier. The case where it arrange | positions to is not asked.

According to the second invention, since the clamp driving mechanism for driving the base is provided, the base moves in the clamping direction. Accordingly, the workpiece transfer device can move three-dimensionally in the feed direction, the lift direction, and the clamp direction together with the feed drive mechanism and the lift drive mechanism. Thereby, it becomes possible to deal with more various pressing processes, and versatility is improved.
Here, the clamping direction refers to a direction that is horizontally orthogonal to the workpiece conveyance direction and in which a pair of bars approach each other.

According to the third aspect of the invention, since at least one of the feed drive mechanism and the lift drive mechanism includes the linear motor, non-contact movement is possible and there is no rotating part. Performance is improved and noise during driving is reduced. Further, since a linear motor is used, a small installation space is required, and high-speed conveyance and high-accuracy positioning are possible.
According to the fourth aspect of the invention, since the clamp drive mechanism includes the linear motor, non-contact movement is possible, and since there is no rotating portion, the durability of the work transfer device is improved and at the time of driving. Noise is reduced. Further, since a linear motor is used, a small installation space is required, and high-speed conveyance and high-accuracy positioning are possible.

According to the fifth aspect, since at least one of the feed drive mechanism and the lift drive mechanism includes the servo motor, the cost of the feed drive mechanism and / or the lift drive mechanism can be reduced, and the power transmission mechanism can be reduced. Ordinary mechanisms such as a ball screw mechanism, a mechanism using a rack and a pinion can be adopted, and maintenance and adjustment of the work transfer device and the press machine are facilitated.
According to the sixth aspect of the invention, since the clamp drive mechanism includes the servo motor, the cost of the clamp drive mechanism is reduced, and a normal mechanism such as a ball screw mechanism, a rack and a pinion mechanism is included in the power transmission mechanism. This makes it easy to maintain and adjust the work transfer device and the press machine.

According to the seventh aspect, since the feed carriers are configured to be independently controllable to move, settings such as the feed carrier moving distance and the moving timing can be freely set according to the mold. . Accordingly, it is possible to flexibly cope with various pressing processes, and the versatility of the work transfer device is improved.
According to the eighth invention, the adjacent feed carriers are connected by the connecting means. Therefore, when one feed carrier is driven, the plurality of feed carriers connected by the connecting means are simultaneously driven in the workpiece conveying direction. Therefore, it is not necessary to provide a feed driving mechanism for all feed carriers, cost reduction is promoted, and the structure and control are further simplified.

  Hereinafter, each embodiment of the workpiece conveyance apparatus of the press machine which concerns on this invention is described with reference to drawings.

[First Embodiment]
FIG. 1 is a front view of a transfer press (press machine) 1 provided with a work transfer device according to a first embodiment of the present invention. FIG. 2 is a perspective view of a transfer feeder 41 which is a work transfer device. FIG. 3 is an enlarged perspective view of a part of the transfer feeder 41. 4 to 6 are partially enlarged views of the transfer feeder 41. FIG.
First, as shown in FIG. 1, four columnar uprights 21 are erected on a bed 23 of the transfer press 1 located below the press frame 10, and a crown 20 is installed on the upper surface of the upright 21. . The crown 20 has a built-in slide drive device, and drives the slide 22 positioned below the crown 20 up and down. The upper mold 12 is attached to the lower surface of the slide 22. A lower mold 13 is installed on the upper surface of the moving bolster 30 facing the slide 22, and the workpiece is press-molded by the cooperation of the upper mold 12 and the lower mold 13. A pair of left and right bars 14A and 14B are extended in parallel with the workpiece conveying direction with the upper mold 12 and the lower mold 13 sandwiched therebetween.

  As shown in FIG. 2, on the bed 23 between the two upstream uprights 21 and between the two upstream uprights 21, the upstream frame 33A extends along a direction orthogonal to the workpiece transfer direction. The downstream frame 33B is installed. The upstream frame 33A and the downstream frame 33B are provided with two pairs of moving rails 42 in parallel with each other along the direction orthogonal to the workpiece transfer direction, and are provided below the both ends of the bars 14A and 14B. The provided supports 47A, 47B, 47C, 47D are arranged so as to be movable on the moving rail 42. As a result, the bars 14A and 14B straddle the moving bolster 30, are supported by the frames 33A and 33B located on both sides of the moving bolster 30, and are movable in a direction perpendicular to the workpiece conveying direction.

Near the moving rail 42 on the near side, a rack 43 is provided in parallel with the moving rail 42, and pinions 43P and 43P provided on the supports 47A and 47B respectively mesh with the racks 43 and 43. The supports 47A and 47B are provided with interlocking racks 34A and 34A parallel to the moving rail 42 toward the opposing supports 47C and 47D, respectively, and interlocking pinions 35 and 35 disposed substantially at the center of the frames 33A and 33B. Meshing. The supports 47C and 47D are also provided with interlocking racks 34B and 34B parallel to the moving rail 42 toward the supports 47A and 47B, respectively, and these interlocking racks 34B and 34B mesh with the interlocking pinions 35 and 35. Yes.
When a drive shaft (not shown) passing through the bar 14A in the longitudinal direction is rotated by the moving motor 44 provided on the support 47A, the pinions 43P and 43P that are gear-driven by the drive shaft are rotated. Then, since the pinions 43P and 43P mesh with the racks 43 and 43, respectively, the front bar 14A moves together with the supports 47A and 47B. At the same time, when the interlocking racks 34A and 34A move, the interlocking pinions 35 and 35 and the interlocking racks 34B and 34B mesh with each other. 14B moves.
As described above, the interlocking racks 34A and 34B and the interlocking pinion 35 are provided, and the distance between the pair of bars 14A and 14B between the front bar 14A and the back bar 14B in FIG. 2 can be adjusted. A bar interval adjusting device 40 is configured. Since the bar interval adjusting device 40 can flexibly cope with various press processes by adjusting the interval between the bars 14A and 14B according to the mold, the versatility of the transfer press 1 can be improved.

As shown in FIGS. 2 and 3, a pair of feed rails 51, 51 are respectively provided on the upper surfaces of the bars 14 </ b> A, 14 </ b> B, and a plurality of feed carriers 52 are provided on the pair of feed rails 51, 51. It is arranged to be movable. In the first embodiment, three feed carriers 52 are used, but one, two, or four or more may be used as necessary.
The feed carrier 52 is driven by a feed linear motor (feed drive mechanism) 53 (see FIG. 4) to perform a feed operation. Here, the feed operation refers to an operation in which the feed carrier 52 moves along the feed direction. Further, the feed direction is a direction parallel to the workpiece conveyance direction.

  4 is a cross-sectional view taken along the line AA in FIG. 4 and 3, the feed linear motor 53 includes a magnet plate 54 provided between the pair of feed rails 51, 51 as a fixed portion, and a magnet on the lower surface of the feed carrier 52 as a moving portion. A coil plate 55 provided to face the plate 54 is provided. When a current is applied so that a moving magnetic field is generated in the coil plate 55, the coil plate 55 is moved by receiving a force attracted and repelled by the magnet plate 54. Then, the feed carrier 52 is moved together with the coil plate 55, whereby the feed carrier 52 is caused to perform a feed operation. Here, since the feed linear motor 53 is provided for each of the plurality of feed carriers 52, the feed carrier 52 can be independently controlled to move independently on the feed rails 51, 51 in the feed direction. It is configured.

  2, 3, and 4, a pair of clamping rails 61, 61 are provided on the upper surface of the feed carrier 52 in a direction perpendicular to the feeding rail 51. A clamp carrier 62 is movably disposed on the surface. The clamp carrier 62 is driven by a clamp linear motor (clamp drive mechanism) 63 (see FIG. 5) to perform a clamp operation. Here, the clamping operation refers to an operation in which the clamp carrier 62 moves along the clamping direction. The clamp direction refers to a direction that is horizontally orthogonal to the feed direction, and refers to a direction in which a pair of opposing clamp carriers 62 approach and separate from each other.

  FIG. 5 is a view taken in the direction of arrow B in FIG. 4 and 5, the clamping linear motor 63 includes a magnet plate 64 provided between the pair of clamping rails 61 and 61 as a fixed portion, and a magnet plate on the lower surface of the clamp carrier 62 as a moving portion. 64 and a coil plate 65 provided so as to oppose. When a current is applied so that a moving magnetic field is generated in the coil plate 65, the coil plate 65 moves under the force attracted and repelled by the magnet plate 64. Then, the clamp carrier 62 is moved together with the coil plate 65, whereby the clamp carrier 62 performs a clamping operation.

  As shown in FIGS. 2 and 3, the L-shaped bracket portion 66 of the clamp carrier 62 has upper and lower surfaces on the back surface in FIG. 2 (the surfaces where the L-shaped bracket portions 66 of the pair of clamp carriers 62 face each other). A pair of lift rails 71, 71 are provided in the direction, and a lift carrier 72 is movably disposed on the pair of lift rails 71, 71. The lift carrier 72 is driven by a lift linear motor (lift drive mechanism) 73 (see FIG. 6) to perform a lift operation. Here, the lift operation refers to an operation in which the lift carrier 72 moves along the lift direction. Further, the lift direction refers to a direction orthogonal to the feed direction and the clamp direction, and refers to the direction in which the lift carrier 72 moves up and down.

  FIG. 6 shows a view in the direction of arrow C in FIG. 4 and 6, the lift linear motor 73 includes a magnet plate 74 provided between a pair of lift rails 71 and 71 as a fixed portion, and a lift carrier 72 as a moving portion in FIG. A coil plate 75 provided opposite to the magnet plate 74 is provided on the front surface. When a current is applied so that a moving magnetic field is generated in the coil plate 75, the coil plate 75 moves due to a force attracted and repelled by the magnet plate 74. Then, the lift carrier 72 is moved together with the coil plate 75, whereby the lift carrier 72 performs a lift operation.

  As shown in FIGS. 2 and 4, the lift carrier 72 is provided with detachable fingers 76, 76 as work holders for holding the works 2, 81. FIG. 7 is a perspective view showing the fingers 76 and 76. As shown in FIG. 7, in the first embodiment, the lift carrier 72 is provided with two fingers 76, 76, and the two fingers 76, of the other opposite lift carrier 72 (not shown) are clamped. 76, two workpieces 2, 81 (see FIG. 3) can be clamped simultaneously.

Here, since the fingers 76 and 76 are installed on the lift carrier 72 and the lift carrier 72 is installed on the clamp carrier 62, the fingers 76 and 76 are provided so as to be movable in the lift direction and the clamp direction. In the embodiment, the lift carrier 72 and the clamp carrier 62 correspond to the base 50 in the present invention.
Thus, since one lift carrier 72 is provided with a plurality (for a plurality of steps) of fingers 76 and 76 and is configured to be able to hold a plurality of workpieces 2, a feed linear motor 53, a clamp linear motor 63, In addition, the number of installed linear motors for lift 73 can be reduced, the simplification of the structure of the transfer feeder 41 can be promoted, and the manufacturing cost can be reduced.
In the first embodiment, the workpiece holder that holds the workpiece 2 uses the finger 76 that places the workpiece 2 while positioning the workpiece 2. However, the present invention is not limited to this. For example, the workpiece 2 is gripped as shown in FIG. The gripper 77 may be used. In the first embodiment, the lift carrier 72 is provided with two fingers 76, 76. However, the number of the fingers 76, 76 installed is three, even if it is one according to the mold. It may be the above.

Similarly to the above description, the other bar 14B is also provided with a feed carrier 52, a clamp carrier 62, and a lift carrier 72, which are each driven by a linear motor to perform a feed operation (movement parallel to the workpiece conveyance direction). , A clamping operation (movement in the direction perpendicular to the feed direction) and a lifting operation (movement in the vertical direction) are performed.
In addition, although the magnet plate of each linear motor was demonstrated on the stationary side and the coil plate on the moving side, the magnet plate may be on the moving side, and the coil plate may be on the stationary side.

Next, referring to FIG. 2 and FIG. 9 showing the motion of the first embodiment, with respect to the operation of the workpiece transfer device of the first embodiment, the case of transferring a workpiece from the first machining step to the second machining step is taken as an example. I will give you a description.
(1) First, the workpiece 2 is pressed in the first processing step, and the slide 22 turns upward.
At this time, the lift carrier 72 to which the finger 76 is fixed is in the down position (lift stroke descending end). The clamp carrier 62 that supports the lift carrier 72 is in an unclamping position (clamp stroke separation end). When the clamp carrier 62 is driven by the clamp linear motor 63, the clamp carrier 62 is clamped from the unclamping position to the clamping position (clamp stroke approaching end) along the clamping rails 61, 61, The workpiece 2 on the mold 13 is placed on the finger 76.

(2) Next, when the lift carrier 72 is driven by the lift linear motor 73 in a state where the workpiece 2 is placed on the finger 76, the lift carrier 72 is lifted from the down position to the lift position (lift stroke rising end). . When the feed carrier 52 is driven by the feed linear motor 53, the feed carrier 52 supporting the clamp carrier 62 is controlled and driven to feed. As a result, the workpiece 2 placed on the finger 76 is transferred from the first machining process to the second machining process.
(3) When the workpiece 2 reaches the second machining step, the lift carrier 72 is driven by the lift linear motor 73 to move the lift carrier 72 down to the down position and onto the lower die 13 in the second machining step. Set work 2.

(4) After the workpiece 2 is set on the lower die 13, when the clamp carrier 62 is driven by the clamping linear motor 63, the clamp carrier 62 is unclamped from the clamp position to the unclamp position, and the finger 76 is moved to the workpiece 2 Evacuate from. When the feed carrier 52 is driven by the feed linear motor 53, the feed carrier 52 returns from the second processing step to the first processing step and moves to the first first processing step.
The above-described finger 76 moves to the unclamping position and retracts out of the interference area with the upper mold 12, and then the slide 22 is lowered and the upper mold 12 and the lower mold 13 attached to the lower surface thereof. The workpiece 2 is sandwiched between and pressed, and a predetermined second working step is pressed.

  As described above, the transfer feeder 41 of the first embodiment includes the feed carrier 52 that can move in the feed direction on the bars 14A and 14B, the clamp carrier 62 that can move in the clamping direction on the feed carrier 52, and the A lift carrier 72 that is movable in the lift direction on the clamp carrier 62 is provided, and each of them is driven by a linear motor to reciprocate in the feed direction and reciprocate in the clamp direction that is horizontally orthogonal to the feed direction. Three-dimensional movements of clamping / unclamping and up / down movement (lift / down movement) reciprocating in the vertical direction are performed. Then, the work holder held by the lift carrier 72 is appropriately reciprocated in the feed direction, the lift direction, and the clamp direction, thereby moving the work 2 downstream from above the lower mold 13 on the upstream side (left direction in FIG. 1). It is sequentially transferred onto the lower mold 13 on the side (right direction in FIG. 1).

  Thus, since the feed carrier 52 is provided so as to be movable on the bars 14A and 14B, the object to be driven by the feed drive mechanism can be small. Therefore, unlike the conventional case, the feed drive mechanism can be made small, and a feed box with a built-in feed drive unit is not required. Therefore, the feed box does not protrude from the side surface of the press body, and the entire transfer press 1 becomes compact. And since a feed box does not protrude, it also becomes possible to arrange | position a workpiece carrying-out apparatus etc. in the vicinity of the transfer press 1. FIG.

  FIG. 10 shows the position of the feed carrier 52 when the work 2 is carried from the work cradle (not shown) at the work carry-in position to the most upstream machining process (first machining process in the present embodiment) of the transfer press 1. 3 is a top view of the transfer press 1. FIG. In FIG. 10, the most upstream finger 76 is the bolster 31 mounted on the moving bolster 30 in a plan view of the transfer press 1 (the state shown in FIG. 10 and the state viewed from the direction orthogonal to the paper surface in FIG. 10). It is located outside and is disposed at a position protruding from the bolster 31 and the moving bolster 30. At this time, the most upstream finger 76 is positioned upstream of the downstream ends of the two upstream uprights 21. This position is a position in the idle process for loading a workpiece. On the other hand, at this time, the most downstream finger 76 is located in the most downstream processing step (the fifth processing step in the present embodiment). When the work 2 is placed on the finger 76 in this state, the material (work 2) supplied from the outside of the transfer press 1 is placed on the uppermost finger 76, and the other fingers 76 are placed on the fingers 76. The workpiece 2 in a state where each processing step is finished is placed. In this state, each feed carrier 52 is moved in the feed direction, and each workpiece 2 is transferred to the next processing step.

  FIG. 11 is a top view of the transfer press 1 showing the position of the feed carrier 52 when the workpiece 2 is unloaded from the most downstream processing step of the transfer press 1 to a workpiece receiving base (not shown) at the workpiece unloading position. In FIG. 11, each feed carrier 52 is in a state where the work 2 is transported and moved from the position of the previous machining step (shown by a two-dot chain line in FIG. 11) to the position of the next machining step. In FIG. 11, the most upstream finger 76 is positioned in the most upstream processing step. On the other hand, the most downstream finger 76 is located outside the bolster 31 and is disposed at a position protruding from the bolster 31 and the moving bolster 30. At this time, the most downstream finger 76 is located on the downstream side of the upstream ends of the two downstream uprights 21. This position is a position in the idle process for workpiece removal. When each finger 76 transfers the workpiece 2 that has been processed in each processing step to the next processing step, the finger 76 on which the workpiece 2 that has completed the most downstream processing step is placed is the press of the transfer press 1. The workpiece 2 is transferred to the outside of the machining area, and the workpiece 2 is unloaded from the transfer press 1.

By the way, when the mold is exchanged, each finger 76 is also exchanged in accordance with the mold, so it is necessary to place the fingers 76 and 76 on the moving bolster 30 together with the bars 14A and 14B and move them outward from the work conveyance area. Here, the bars 14A and 14B themselves can pass between the uprights 21 and move out of the work conveyance area, but the bar interval adjusting device 40 connected to the upstream and downstream of the bars 14A and 14B is provided upstream. Since it is installed in the frames 33A, 33B between the upright 21 on the side and the upright 21 on the downstream side, it prevents the bars 14A, 14B from being carried out.
Therefore, as shown in FIG. 12, the bar 14A, 14B and the bar interval adjusting device 40 including the drive shaft can be divided so that the bars 14A, 14B can be separated when the mold is replaced. Separate from 40. That is, in the first embodiment, the bars 14 </ b> A and 14 </ b> B are configured to be detachable from the bar interval adjusting device 40, and can be divided from the fixed bar fixed to the bar interval adjusting device 40 and the fixed bar. It consists of a moving bar. Thereby, the bars 14A and 14B can be detached from the frames 33A and 33B.
The moving bolster 30 is provided with a bar pedestal 48 with a lifting device, and supports the divided bars 14A and 14B as shown in FIG.
The bar cradle 48 is provided with means for moving the bars 14A and 14B in the clamping direction. When the mold is exchanged on the moving bolster 30 in the mold exchange operation outside the press body, The interval is widened so that the mold can be easily replaced.

[Second Embodiment]
Next, the transfer feeder 41A of the second embodiment will be described with reference to FIG. FIG. 13 is a perspective view showing a part of the transfer feeder 41A. The second embodiment is different from the first embodiment in that the feed carrier 52, the clamp carrier 62, and the lift carrier 72 are driven by a servo motor. This point will be described with reference to FIG. 13, and the other parts will be described. Since it is the same as that of 1st Embodiment, the thing similar to what was demonstrated in 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

As shown in FIG. 13, a pair of bars 14AA are provided in parallel to the workpiece conveyance direction, as in the first embodiment, and a plurality of feed carriers 52A are provided on a pair of feed rails 51, 51 on the upper surface of the bar 14AA. These are arranged so as to be movable independently. Although one feed carrier 52A is shown in FIG. 13, any number may be provided as necessary.
The feed carrier 52A is driven by a feed servo motor (feed drive mechanism) 53A provided on the bar 14AA to perform a feed operation. A ball screw 54A that is chain driven by a feed servo motor 53A is provided on the bar 14AA. When the ball screw 54A rotates, a ball nut (not shown) provided on the feed carrier 52A moves, and the feed carrier 52A moves together with this ball nut. . Thereby, the feed carrier 52A performs a feed operation.

  A pair of clamp rails 61, 61 are provided on the upper surface of the feed carrier 52A in a direction perpendicular to the feed rail 51, and the clamp carrier 62A is movably disposed on the pair of clamp rails 61, 61. Yes. The clamp carrier 62A is driven by a clamp servomotor (clamp drive mechanism) 63A provided on the feed carrier 52A to perform a clamp operation.

  A ball screw 64A driven by a clamping servomotor 63A is provided on the feed carrier 52A. When the ball screw 64A rotates, a ball nut (not shown) provided on the clamp carrier 62A moves, and the clamp carrier 62A moves together with the ball nut. . Thereby, the clamp carrier 62A performs the clamping operation.

  A pair of lift rails 71, 71 are provided in the vertical direction on the rear surface of the L-shaped bracket portion 66 </ b> A of the clamp carrier 62 </ b> A in FIG. 13, and the lift carrier 72 </ b> A moves on the pair of lift rails 71, 71. Arranged to be possible. The lift carrier 72A is driven by a lift servomotor (lift drive mechanism) 73A to perform a lift operation.

The lift servo motor 73A drives a ball screw 74A rotatably provided on the lift carrier 72A via a gear box 73G provided on the lift carrier 72A. When the ball screw 74A rotates, a ball nut (not shown) provided on the lift carrier 72A moves, and the lift carrier 72A moves together with the ball nut. Thereby, the lift carrier 72A performs the lift operation. The lift carrier 72A is provided with a finger (not shown) that is detachable as a work holder for holding the work, as in the first embodiment, and a description thereof is omitted.
Further, the operations of the feed carrier 52A, the clamp carrier 62A, and the lift carrier 72A are the same as those in the first embodiment, and thus the description thereof is omitted.

  Similarly to the above description, the other bar (not shown) is also provided with the same feed carrier, lift carrier, and clamp carrier as the bar 14AA, and each is driven by a servo motor to feed and lift. And a clamping operation.

  As described above, in the second embodiment, the transfer feeder 41A includes the feed carrier 52A that can move in the feed direction on the bar 14AA, the clamp carrier 62A that can move in the clamping direction on the feed carrier 52A, and the clamp carrier. A lift carrier 72A that can move in the lift direction on 62A is provided, and each is driven by a servo motor, and the feed operation, the clamp operation, and the lift operation are controlled by a controller (not shown), and operate as a three-dimensional transfeeder. It is supposed to be. Then, the work holder held by the lift carrier 72 is appropriately reciprocated in the feed direction, the clamp direction, and the lift direction, thereby moving the work 2 from the lower mold 13 on the upstream side (left direction in FIG. 1) to the downstream side ( It is sequentially transferred onto the lower mold 13 (right direction in FIG. 1).

[Third Embodiment]
Next, the transfer feeder 41B of the third embodiment will be described with reference to FIG. FIG. 14 is a perspective view showing a part of a transfer feeder 41B which is a work transfer device. Components similar to those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the third embodiment, adjacent feed carriers 52 are connected by the connecting means 56 in the first embodiment. As a result, the plurality of feed carriers 52 are arranged such that adjacent feed carriers 52 have a predetermined interval. By doing in this way, since all the feed carriers 52 supported by one bar 14 operate | move interlock | cooperated, it becomes unnecessary to provide a feed drive mechanism in all the feed carriers 52, respectively. In FIG. 14, only the upstream feed carrier 52 is provided with a linear motor 53B which is a feed driving mechanism.
Note that, as in the first embodiment, all the feed carriers 52 may be provided with linear motors, and the respective linear motors may be driven in synchronization with each other.
Since the operation of the transfer feeder 41B is the same as that of the first embodiment, description thereof is omitted.

[Fourth Embodiment]
Next, a transfer feeder 41C of the fourth embodiment will be described with reference to FIG. FIG. 15 is a perspective view of a transfer feeder 41C which is a work transfer device. Components similar to those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the fourth embodiment, the clamp linear motor 63 is removed and the lift carrier 72 is supported by the feed carrier 52 in the first embodiment. As a result, the clamping operation is removed, so that the distance between the pair of lift carriers 72 provided on the pair of bars 14 and facing each other is kept constant, and the cross bar 78 is horizontally disposed between the pair of lift carriers 72. It is built. The cross bar 78 is provided with a vacuum cup (work holder) 79 that sucks the work using negative pressure. Here, in the fourth embodiment, the vacuum cup 79 is held by the lift carrier 72 via the cross bar 78, and the lift carrier 72 is provided so as to be movable in the lift direction. It corresponds to.
With the above configuration, the transfer feeder 41C according to the fourth embodiment can perform a two-dimensional operation when the feed carrier 52 performs a feed operation and the lift carrier 72 performs a lift operation.

Next, referring to FIG. 15 and FIG. 16 showing the motion of the fourth embodiment, with respect to the operation of the workpiece transfer device of the fourth embodiment, the case of transferring the workpiece from the first machining step to the second machining step is taken as an example. I will give you a description.
(1) First, the workpiece 2 is pressed in the first processing step, and the slide 22 turns upward.
At this time, the cross bar 78 installed on the lift carrier 72 is disposed at a standby position between the first processing step and the second processing step. In this standby position, the lift carrier 72 is located at the lift position (lift stroke rising end). When the press working is completed, the feed carrier 52 on which the lift carrier 72 is supported is controlled and driven to return to the first working process side. Then, the cross bar 78 moves from the standby position to the first machining step.
Next, the lift carrier 72 is lowered to the down position (lift stroke lowering end), and the workpiece 2 on the lower die 13 in the first machining step is adsorbed by the vacuum cup 79 disposed on the cross bar 78.
(2) Next, the lift carrier 72 is lifted to the lift position (lift stroke rising end) while the workpiece 2 is adsorbed by the vacuum cup 79. Further, the feed carrier 52 is controlled and driven to feed. As a result, the work 2 adsorbed by the vacuum cup 79 is transported from the first machining process to the second machining process.
(3) When the workpiece 2 reaches the second machining step, the lift carrier 72 is moved down to the down position, and the workpiece 2 is set on the lower mold 13 in the second machining step. Then, the suction force of the vacuum cup 79 is released.
(4) After the workpiece 2 is set on the lower mold 13, the lift carrier 72 is lifted to the lift position, and the feed carrier 52 is controlled to return to move to the first standby position.
After the cross bar 78 moves to the standby position and retracts out of the interference area with the upper mold 12, the slide 22 is lowered, and the upper mold 12 and the lower mold 13 attached to the lower surface of the slide 22 are moved downward. The workpiece 2 is sandwiched and pressed between them, and a predetermined second working step is pressed.

  As described above, the transfer feeder 41C of the fourth embodiment is provided with the feed carrier 52 that can move in the feed direction on the bar 14, and the lift carrier 72 that can move in the lift direction on the feed carrier 52. Each is driven by a linear motor to perform a two-dimensional operation of a feed / return motion that reciprocates in the feed direction and a lift motion that reciprocates in the vertical direction. Then, the cross bar 78 installed on the lift carrier 72 and the vacuum cup 79 provided on the cross bar 78 are appropriately reciprocated in the feed direction and the lift direction, thereby moving the workpiece 2 upstream (FIG. 15). Are sequentially transferred from the lower mold 13 to the lower mold 13 on the downstream side (right direction in FIG. 15).

  In the fourth embodiment, a vacuum cup 79 as a work holding tool is disposed on the cross bar 78, but a vacuum cup 79 may be disposed on the lift carrier 72 as shown in FIG.

  Further, in the fourth embodiment, the clamping linear motor 63 of the first embodiment is removed. However, in the configuration of the first embodiment, the driving of the clamping linear motor 63 is stopped, and the crossbar 78 and the vacuum are stopped. The cup 79 may be moved two-dimensionally.

  In each of the above-described embodiments, each drive mechanism is unified as a linear motor or a servo motor. However, a linear motor and a servo motor may be combined. For example, the feed may be driven by a linear motor, the lift and clamp may be driven by a servo motor, and the workpiece holder may be moved, and at least one drive source may be a linear motor. Further, for example, the workpiece holder may be moved by driving the feed by a servo motor and the clamp and the lift by a linear motor, and at least one drive mechanism may be a servo motor. That is, a linear motor or a servo motor may be used as necessary for the feed, clamp, and lift drive mechanisms.

  In the above description, a so-called two-column type transfer press having four uprights and one slide has been described. However, a so-called three-column type transfer press having six uprights and two slides or more. You may use for press machines, such as a transfer press which has an upright and a slide.

In addition, this invention can acquire an effect also in retrofit.
As a recent trend in transfer presses, the retrofitting of presses has been actively promoted by replacing the cam-driven workpiece transfer device of the existing press machine with a servo-controlled drive device to improve functions such as high speed and various workpieces. Has been done. However, even when the drive source in the feed direction is a servo motor as in the past, the feed box, which is the main part of the feed device, is arranged to protrude from the side surface of the press main body on the carry-out side (or work carry-in side). Had to replace the feed box as a result. Since the feed box is large and heavy and protrudes from the side of the press body, many work days are required to replace the feed box, including work to weld the feed box mounting seat to the press body. Needed.
In such retrofit, a long stop period of the production processing line in operation is required, which hinders user production.

  In the present invention, since the feed carrier is provided so as to be movable on the bar, the drive target of the feed drive mechanism can be made small, and therefore the feed drive mechanism can be made small. Therefore, there is no need to provide a conventional feed box in the press machine body. Therefore, when retrofitting is performed, the moving bolster may be modified or remade, and the press machine main body may be minimally modified such as removal of unnecessary devices. Thereby, the construction period required for retrofit can be shortened, and the influence on the user's production efficiency can be minimized.

The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

The front view which shows the press machine which concerns on 1st Embodiment of this invention. The perspective view which shows the workpiece conveyance apparatus which concerns on 1st Embodiment of this invention. The perspective view which expanded a part of work conveyance device concerning a 1st embodiment of the present invention. AA sectional drawing of FIG. B arrow view of FIG. C arrow line view of FIG. The perspective view of the workpiece holder which concerns on 1st Embodiment of this invention. The perspective view which shows the modification of the workpiece holder of this invention. The figure which shows the motion of the workpiece holder which concerns on 1st Embodiment of this invention. The top view of the workpiece conveyance apparatus which concerns on 1st Embodiment of this invention. The top view of the workpiece conveyance apparatus which concerns on 1st Embodiment of this invention. The top view of the workpiece conveyance apparatus which concerns on 1st Embodiment of this invention. The perspective view which shows a part of workpiece conveying apparatus which concerns on 2nd Embodiment of this invention. The perspective view which shows the workpiece conveyance apparatus which concerns on 3rd Embodiment of this invention. The perspective view which shows the workpiece conveyance apparatus which concerns on 4th Embodiment of this invention. The figure which shows the motion of the workpiece holder of 4th Embodiment of this invention. The perspective view which shows the modification of the workpiece conveyance apparatus of the press machine of this invention. The front view which shows the conventional press machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transfer press (press machine), 2 ... Workpiece, 14A, 14B, 14AA ... Bar, 30, 30A ... Moving bolster, 33A, 33B ... Frame, 40, 40A ... Bar space | interval adjustment apparatus, 41, 41A, 41B, 41C Transfer feeder (work transfer device), 50, 50A ... Base, 52, 52A ... Feed carrier, 53 ... Feed linear motor (feed drive mechanism), 53A ... Feed servo motor (feed drive mechanism), 62, 62A ... Clamp carrier 63 ... Linear motor for clamp (clamp drive mechanism), 63A ... Servo motor for clamp (clamp drive mechanism), 72, 72A ... Lift carrier, 73 ... Linear motor for lift (lift drive mechanism), 73A ... For lift Servo motor (lift drive mechanism), 76 ... F Aurangabad (work holder) 77 ... gripper (work holder), 79 ... vacuum cup (work holder).

Claims (8)

In the work transfer device (41, 41A, 41B, 41C) of the press machine (1),
A pair of bars (14, 14A, 14B, 14AA) supported by the frames (33A, 33B) arranged on both sides of the moving direction of the moving bolster (30, 30A) and parallel to the workpiece conveying direction. When,
A feed carrier (52, 52A) supported on the bar (14, 14A, 14B, 14AA);
A feed driving mechanism (53, 53A, 53B) that is provided on the bar (14, 14A, 14B, 14AA) and drives the feed carrier (52, 52A) in the workpiece transfer direction;
A base (50, 50A) supported by the feed carrier (52, 52A);
A lift driving mechanism (73, 73A) which is provided on the feed carrier (52, 52A) and drives the base (50, 50A) in the lift direction to move up and down;
A workpiece holder (76, 77, 79) which is detachably provided on the base (50, 50A) and holds the workpiece (2);
It is provided on the frame (33A, 33B) and is operated during adjustment work different from the press work in the press machine (1) to adjust the distance between the pair of bars (14, 14A, 14B, 14AA). a bar spacing adjustment device (40, 40A) for,
The pair of bars (14, 14A, 14B, 14AA) are fixed to the bar interval adjusting device (40, 40A) when the moving bolster (30, 30A) is moved from the press body of the press machine (1). And a movable bar placed on a bar cradle (84) provided on the moving bolster (30, 30A).
The feed carrier (52, 52A) is supported on the moving bar,
The base (50, 50A) is provided with the work holders (76, 77, 79) for a plurality of steps in a detachable manner . 41A, 41B, 41C). In the workpiece conveyance device (41, 41A, 41B) of the press machine (1) according to claim 1,
A press machine provided with a clamp driving mechanism (63, 63A) that is provided on the feed carrier (52, 52A) and drives the base (50, 50A) in a clamping direction orthogonal to the workpiece conveyance direction. (1) Work transfer device (41, 41A, 41B). In the workpiece transfer device (41, 41A, 41B, 41C) of the press machine (1) according to claim 1 or claim 2,
At least one of the feed drive mechanism (53, 53A, 53B) and the lift drive mechanism (73, 73A) is provided with a linear motor. 41A, 41B, 41C). In the workpiece conveyance device (41, 41A, 41B) of the press machine (1) according to claim 2,
The clamp drive mechanism (63, 63A) is provided with a linear motor. The workpiece transfer device (41, 41A, 41B) of the press machine (1). In the workpiece transfer device (41, 41A, 41B, 41C) of the press machine (1) according to claim 1 or claim 2,
At least one of the feed drive mechanism (53, 53A) and the lift drive mechanism (73, 73A) includes a servo motor. The work transfer device (41, 41A, 41B, 41C). In the workpiece conveyance device (41, 41A, 41B) of the press machine (1) according to claim 2,
The clamp drive mechanism (63, 63A) includes a servo motor. The workpiece transfer device (41, 41A, 41B) of the press machine (1). In the workpiece conveyance device (41, 41A, 41C) of the press machine (1) according to any one of claims 1 to 6,
A plurality of the feed carriers (52, 52A) are supported on the bars (14, 14A, 14B, 14AA),
Each said feed carrier (52, 52A) is comprised so that movement control is possible independently. The workpiece conveyance apparatus (41, 41A, 41C) of the press machine (1) characterized by the above-mentioned. In the workpiece conveyance device (41B) of the press machine (1) according to any one of claims 1 to 6,
A plurality of the feed carriers (52) are supported on the bar (14),
Adjacent feed carriers (52) are connected by connecting means (56). Work transfer device (41B) of press machine (1), wherein:

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