JP2861770B2 - Transfer device in press mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device in a press die for transferring a workpiece such as a press working material or a press material in the process of being processed to a predetermined working position in a mold in accordance with the timing of the press working. .

[0002]

2. Description of the Related Art As a conventional transfer device in a press die, there is one disclosed in Japanese Utility Model Laid-Open No. 1-20926. As shown in FIGS. 8 and 9, the in-press-type transfer device 10 is incorporated in a tandem-type press working device, and includes a pair of feed plates 12a provided with a gripper 11 for holding a workpiece W. , 12b. The gripper 11 is operated by an air cylinder or the like to grip and release the workpiece W. Two guide members 1 extending along the conveying direction of the workpiece W are provided on the upper plate 13 that constitutes the frame of the conveying device 10 in the press die.
4 are provided at predetermined intervals. Each of the feed plates 12a and 12b is slidably mounted on each guide member 14, and is movable between two processing positions P1 and P2 in the press die. The feed plate 12 is located at the lateral center of the lower plate 15.
An air actuator 16 for driving a and 12b is provided. The other end of an arm member 19 having a pin 18 at one end is fixed to a rotation shaft 17 connected to the output shaft of the air actuator 16. A cam plate 20 is attached to the feed plates 12a and 12b so as to be located outside the upper plate 13. The pin 18 of the arm member 19 is slidably engaged with the elongated hole 20a formed in the cam plate 20.

Therefore, when the rotating shaft 17 rotates in the direction of arrow D in FIG. 8, each of the feed plates 12a, 12b
Moves linearly in the direction of arrow F between the first processing position P1 and the second processing position P2 in the press die synchronously along the guide member 14. 8 and 9
, Reference numeral “21” denotes the feed plate 12a, 1
2b shows a shock absorber that abuts one side surface.

[0004] Further, in another conventional transfer device in a press die, in order to raise and lower the workpiece, a feed plate or the like holding the workpiece is raised and lowered using an air cylinder. .

[0005]

As in the conventional press-in-conveyance apparatus, there is no method for transferring the workpiece W by converting the rotational movement of the actuator 16 into forward and backward linear movements using a crank. As is clear from FIG. 9, a space for installing the driving mechanisms 16 and 19 is required at the side portion of the transfer device 10 in the press die, and accordingly, the press die becomes large and the die cost increases. May be caused.

Further, since the rotational motion of the actuator 16 is converted into a linear motion using a crank, the workpiece W
The moving speed of the workpiece becomes relatively slow, and the workpiece is positioned at a predetermined position within one cycle time of press working, that is, for example, within a time when the upper die descends from top dead center to bottom dead center and rises again to top dead center. There is also a problem that the transfer may not be possible, and the loss time may increase.

Further, if an air cylinder is used to raise and lower the workpiece W, the number of devices that must be controlled in accordance with the timing of press working increases, which not only complicates the control but also increases the cost. Resulting in. In addition, the air cylinder and the air piping connected to it must be arranged in a position that does not interfere with the press working, which makes the design of the mold for forming the landfill and the design of the piping layout complicated. turn into.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems associated with the above-mentioned prior art, and can be installed in a mold without increasing the size of the mold structure. Processing material can be transported to the specified position reliably,
It is a further object of the present invention to provide a press-type transfer device that can contribute to facilitation of control and cost reduction through reduction of the number of devices to be controlled.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is provided in a press die having a lower die and an upper die which is relatively movable toward and away from the lower die. In a press die transfer device for transferring a workpiece to at least two press working positions in a die, a lifter disposed in the lower die and elastically biased toward the upper die by elastic means, and a lifter A guide member provided on the guide member and extending along the direction of transport of the workpiece, a transport section slidably provided on the guide member, and a holding member provided on the transport section for holding the workpiece. A motor provided in the transport section for reciprocating the transport section along the guide member, and the lifter provided in the upper mold when the upper mold relatively moves closer to the lower mold. Against the elasticity of the elastic means Is a press-type transfer device, characterized in that it comprises a means depressed to retract the said retaining member from the working surface of the lower mold is lowered to.

[0010]

The workpiece set at one of the two press working positions is held on the transfer unit while the lifter is elastically biased toward the upper die by an elastic means. It is held by the member. When the motor is driven in this state, the transport unit moves along the guide member, and the held workpiece is transported to the other press working position. When the upper die moves closer to the lower die, the lifter is pressed down by the pressing means against the elastic force of the elastic means, and the holding member moves to a position retracted from the processing surface of the lower die. I do. With the lowering of the lifter, the workpiece held by the holding member is delivered to the lower die.

As described above, since the workpiece is conveyed by directly using the driving force of the motor, it is not necessary to secure a space for installing a driving mechanism at a side position of the conveying device in the press die. The transfer device can be compactly arranged in the mold, and the press mold does not become large. Further, since the driving force of the motor is directly used, the conveying speed of the workpiece is increased, and the loss time is reduced.

Further, since the lifter is moved up and down by using a cushion, the movement of the lifter is as follows.
Since the upper die is driven by the relative movement with respect to the lower die, there is no need to provide a cylinder for driving the lifter up and down, and the only device to be controlled is the motor.

Moreover, when press working is performed,
With the relative movement of the upper mold with respect to the lower mold, the holding member moves to a position retracted from the processing surface of the lower mold, so that there is no possibility that the transfer device in the press mold is damaged.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a transfer device in a press die according to an embodiment of the present invention. FIG. 1 is a schematic plan view showing a state in which a transfer device in a press die according to an embodiment of the present invention is installed in a lower die of a press working device.
1 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. 1, and FIG. 4 is a sectional view taken along line 4-4 in FIG.

As shown in FIGS. 2 to 4, the press working device 31 in which the in-press transfer device 30 is incorporated is attached to a lower die 33 fixed on a base 32 and a vertically movable ram (not shown). An upper mold 34 is provided which is movable toward and away from the lower mold 33. As shown in FIG. 1, the transfer device 30 in a press die is installed in a lower die 33.

As shown in FIG. 1, the press working apparatus 31 of this embodiment is a tandem type, and a first working position P1 and a second working position P2 are provided in the mold. . The workpiece W has been subjected to a predetermined press working by another press working apparatus before being carried into the press working apparatus 31, and has a plate shape that is elongated and slightly curved at both longitudinal ends. Specifically, it is the center member of the subframe of the vehicle. At the first processing position P1, cutting of an unnecessary portion remaining on the outer peripheral portion of the workpiece W indicated by hatching and piercing for opening a hole indicated by cross hatching are performed. On the other hand, at the second processing position P2, a coining process is performed on the workpiece W that has been cut and pierced, at a portion indicated by hatching.

As shown in FIGS. 2 and 3, the upper die 34 is used to perform the cutting process and the piercing process on the workpiece W set at the first processing position P1. Cutter 35, pad 36 for pressing the upper surface of workpiece W, piercing punch 37 for piercing
Etc. are attached. As shown in FIG. 3, the lower die 33 is provided with a die 38, a retainer 39, and the like that come into contact with the lower surface of the workpiece W. Further, the lower die 33 is formed with a hole 40 for discharging the scrap punched by each pier sponge 37. The scrap is made of a scrap chute 41 shown by a virtual line in FIG.
It falls down and is led to a press scrap hole (not shown).

In order to perform coining processing on the workpiece W set at the second processing position P2, as shown in FIG. 4, a plate 42 for pressing the upper surface of the workpiece W is provided on the upper die 34. A die 43 and the like are attached to the lower mold 33. The lower die 33 has a locating pin 4 that fits into a positioning locating hole 44 formed in the workpiece W.
5 are provided. The locate pin 45 is also provided on the lower die 33 of the first processing position P1. Further, in order to lift the workpiece W set at the second processing position P2, an extraction pin 62 is elastically urged toward the upper mold 34 by a spring or the like on the lower mold 33. Second processing position P2
The workpiece W is lifted up by the take-out pin 62, and thereby rises to a transportable position where the workpiece W does not interfere with the components of the lower die 33. Note that reference numeral “46” in FIGS. 3 and 4 indicates a knockout pin.

The in-press transfer device 30 transfers the workpiece W between two press working positions P1 and P2 in a die composed of a lower die 33 and an upper die 34.

As shown in FIGS. 1 and 2, the press-type transfer device 30 includes a lifter 50 which is disposed in the lower die 33 across two processing positions P1 and P2. Is resiliently biased toward the upper mold 34 by a machine cushion such as a spring or rubber in the bolster, that is, an elastic means 52 via a cushion pin 51. FIG. 2 shows a state in which the lifter 50 reaches the lower limit and contacts the upper end surface of the lower mold 33. On the upper end surface of the lifter 50,
A guide member 53 extending along the transport direction of the workpiece W indicated by an arrow F in FIG. 1 is attached. On the guide member 53, a holding member 5 for holding the workpiece W is provided.
A feed plate 54 as a transport unit provided with 5, 56, 57, 59 is slidably mounted.

As shown in FIGS. 3 and 4, the holding member includes a first unloading plate 55 for holding a substantially central portion of the workpiece W from the lower surface side, and the first unloading plate 55 in the drawing. The second unloading plate 56, which is located on the left side and holds the inclined portion of the workpiece W from the lower side, and the right side in the drawing of the first unloading plate 55, holds the flat portion of the workpiece W from the lower side. And a third carrying-out plate 57. As shown in FIG. 2, the first carrying-out plate 55
Convex portion 55 for preventing displacement of workpiece W in the transport direction
a is provided. A pin 59 that fits into a through hole 58 formed in a flat portion of the workpiece W is also provided on the feed plate 54 as a holding member.

A motor M, preferably a servomotor, for reciprocating the feed plate 54 along the guide member 53 is mounted on the feed plate 54.
The drive gear connected to the output shaft of the servo motor M meshes with a rack formed on the guide member 53 via a gear train. Therefore, by rotating the servo motor M in the forward and reverse directions as appropriate, the feed plate 54
It is moved forward in the direction from the processing position P1 to the second processing position P2, or is moved backward in the direction from the second processing position P2 to the first processing position P1.

The workpiece W that has been subjected to the predetermined press working at the second working position P2 is pushed out by the feed plate 54 moved to the forward limit position and carried out of the mold. For this reason, as shown in FIGS. 1 and 2, the feed plate 54 is provided with an extrusion plate 60 extending in a direction perpendicular to the transport direction. A product chute 63 or a conveyor for guiding the extruded workpiece W is provided at a side position of the lower die 33. The workpiece W passes through the product chute 63 and the like to be processed in the next stage of the processing stage. (Fig. 7 (8)
reference).

When the upper mold 34 moves closer to the lower mold 33, the lifter 50 is pushed down against the elastic force of the elastic means 52, and the holding members 55, 56, 57, 59 are pushed down.
The upper die 34 is retracted to a position below the processing surface of
Is mounted with a leading pin 61 acting as a pressing means for acting on a machine cushion built in the lower die bolster to push down the cushion pin 51 described above.

Next, the operation of this embodiment will be described with reference to the cycle diagram of the transfer device in the press die shown in FIG. 5 and the operation state diagrams shown in FIGS. 6 and 7.

First, before the press working device 31 is started, that is, when the upper die 34 is maintained at the top dead center, the lifter 50
The pressing force of the leading pin 61 is released, and the elastic force is further urged through the cushion pin 51 to reach the ascending limit position. The feed plate 54 is at the forward limit position (see FIG. 6A). This position is the 30 original position of the transfer device in the press die.

When the transfer device 30 in the press die is at the original position, the first workpiece W1 is positioned and set at the first processing position P1 of the lower die 33. The work material W1 is carried in manually by a small press machine.
When the workpiece W is large, it is performed by the loading device (see FIG. 6 (2)).

When the press working device 31 is started, the upper mold 34 starts descending toward the lower mold 33. Upper mold 34
Is 190mm before bottom dead center (point in Fig. 5)
Then, the leading pin 61 comes into contact with the pin of the machine cushion in the bolster, and pushes down the cushion pin 51. When the upper mold 34 further descends from this point, the lifter 50
Is pushed down by the leading pin 61 against the elastic force of the elastic means 52.

When the upper die 34 further descends while pushing down the lifter 50, and reaches a point 130 mm before the bottom dead center (point in FIG. 5), the servomotor M is driven, and the feed plate 54 is moved from the forward limit position to the third position. The backward movement is started toward one processing position P1 (see FIG. 6 (3)).

When the upper mold 34 reaches the bottom dead center, the lifter 50 has reached the lower limit position.
No. 4 is moving backward. When the lifter 50 reaches the lower limit position, the holding members 55, 56, 57, and 59 hold the lower mold 33.
The workpiece W1 set at the first processing position P1 is cut and pierced in this state. As described above, since the lifter 50 is lowered prior to the lowering of the upper mold 34, the transfer device 30 in the press mold is not damaged.

As the upper mold 34 rises past the bottom dead center, the lifter 50 starts to rise. After starting the retreat movement, the feed plate 54 reaches the retreat limit position in one second, for example, and the drive of the servo motor M is stopped. The feed plate 54 is configured such that the lifter 50 is
The retracted position has been reached before climbing to the position that holds 1.

When the upper mold 34 further rises, the lifter 50
Is raised by the holding members 55, 56, 57, 59 provided on the feed plate 54.
Is held. When the leading pin 61 is separated from the cushion pin of the machine cushion in the bolster and the lifter 50 reaches the upper limit position (point in FIG. 5), the workpiece W1 set at the first processing position P1 is moved to the lower die 33. And rises to a transportable position where it does not interfere with the components of the lower mold 33 (see FIG. 6D).

The upper mold 34 is further raised and the ram angle is 300
At this point (the point in FIG. 5), the servo motor M is driven, and the feed plate 54 starts moving forward from the retreat limit position toward the second processing position P2 (see FIG. 6 (5)). ).

When the upper mold 34 rises to the top dead center, the feed plate 54 reaches the forward limit position, whereby the workpiece W1 is transported to a position above the second machining position P2 in the lower mold 33. become.

Then, the transfer device 30 in the press die returns to the original position, and the second new workpiece W2 is moved to the position shown in FIG.
As shown in (2), the first processing position P of the lower die 33
It is set by positioning to 1.

After the setting of the new workpiece W2 is completed, the press working device 31 is started. When the upper mold 34 is lowered below 190 mm before the bottom dead center (point in FIG. 5), the lifter 50 is pushed down by the leading pin 61 as described above. As the lifter 50 descends, the first workpiece W1 held is moved to the second processing position P of the lower die 33.
2 and set. Upper die 34 is 1 before bottom dead center
At a point of 30 mm (point in FIG. 5), the feed plate 54 starts to retreat, so that the workpiece W2 is transferred from the holding member to the lower mold 33 when the upper mold 34 is moved 130 mm before the bottom dead center. It will end before it reaches.

When the upper mold 34 further descends while pushing down the lifter 50, and reaches a point 130 mm before the bottom dead center (point in FIG. 5), the servomotor M is driven, and the feed plate 54 moves backward from the forward limit position. The movement is started (see FIG. 7 (6)). When the feed plate 54 reaches the retreat limit position, the driving of the servo motor M is stopped.

When the upper die 34 reaches the bottom dead center, cutting and piercing are performed on the second workpiece W2 set at the first processing position P1, and the second processing position P
Coining is performed on the first workpiece W1 set to 2.

The lifter 50 rises as the upper die 34 rises after passing through the bottom dead center, and the second workpiece W2 is held on the feed plate 54 that has reached the retreat limit position.

As the upper mold 34 rises, the lifter 50 reaches the upper limit position, the upper mold 34 further rises, and the ram angle becomes 3
At the time when the angle reaches 00 degrees (the point in FIG. 5), the servomotor M is driven, and the feed plate 54 starts to move forward from the retreat limit position (see FIG. 7 (7)). At this time, the first workpiece W1 set at the second processing position P2 is lifted by the take-out pin 62 provided on the lower die 33, and can be conveyed without interfering with the components of the lower die 33. Has been rising.

Then, the first workpiece W1 lifted to the above-mentioned transportable position is pushed out by the pushing plate 60 which abuts as the feed plate 54 moves forward (see FIG. 7 (7)). . Feed plate 54
Reaches the forward limit position, the first workpiece W1 is completely extruded from the mold and is sent to the next processing stage through the product chute 63 (see FIG. 7 (8)). .

By sequentially repeating the above procedure,
The workpiece W that has been subjected to the predetermined press working at the first processing position P1 is conveyed to the second processing position P2 by the in-press transfer device 30, and the workpiece that has been subjected to the predetermined press working at the second processing position P2. W is extruded from the inside of the mold by the in-press conveying device 30.

As described above, the transfer device 30 in the press die according to the present embodiment is a system in which the workpiece W is transported by directly using the rotational driving force of the servo motor M, and therefore the rotational motion of the actuator is controlled. It is not necessary to secure a space for installing a drive mechanism at a side part of the transfer device in the press die unlike the method of converting into linear motion using a crank. For this reason, the press die transfer device 30 can be compactly arranged in the die, and the size of the press die can be reduced and the die cost can be reduced.

Further, since the driving force of the servo motor M is directly used, the moving speed of the workpiece W is relatively high, and is within one cycle time of the press working, that is, the upper die 3.
4, the workpiece W can be reliably transported to a predetermined position within the time of falling from top dead center to bottom dead center and rising again to top dead center,
Loss time is also reduced.

Further, the workpiece W is driven by the servomotor M.
, A complicated transport operation can be easily realized.

Since the lifter 50 is moved up and down by using the cushion pin 33, the movement of the lifter 50 follows the movement of the upper mold 34. The operation time can be shortened as compared with. Furthermore, since only the operation of the servomotor M needs to be controlled at a predetermined timing, the number of devices to be controlled can be reduced. For this reason, control becomes easy, and mold design simplification and cost reduction can also be achieved.

Further, by pushing down the lifter 50 by the leading pin 61, all the conveyance can be performed within one cycle of the press working. Furthermore, since the lifter 50 is pushed down before the upper mold 34 reaches the bottom dead center, there is no possibility that the transport device 30 in the press mold is damaged.

In the above-described embodiment, the case where the in-press transfer device 30 is incorporated in the press working device 31 for performing the two steps of press working is shown, but the present invention is not limited to this case. Instead, it is also possible to incorporate it into a press working device that performs press working in three or more steps.

[0049]

As described above, according to the press die transfer device of the present invention, the die structure can be installed in the die without increasing the size of the die structure, and the workpiece can be processed within one cycle time of press processing. The material can be reliably transported to a predetermined position, and furthermore, simplification of control and reduction in cost can be achieved through reduction of the number of devices to be controlled. In addition, when the press working is performed, the holding member moves to a position retracted from the processing surface of the lower mold with the relative movement of the upper mold to the lower mold, so that the transfer device in the press mold may be damaged. There is no.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a state in which a transfer device in a press die according to an embodiment of the present invention is installed in a lower die of a press working device.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;

FIG. 5 is a cycle diagram of the transfer device in the press die.

FIGS. 6 (1) to 6 (5) are operation state diagrams showing the operation state of the transfer device in the press die.

FIGS. 7 (6) to 7 (8) are operation state diagrams showing the operation state of the transfer device in the press die.

FIG. 8 is a side view showing a conventional transfer device in a press die.

9 is a schematic plan view showing a part of the transfer device in the press die shown in FIG.

[Description of Signs] 30 ... Conveying device in press die, 31 ... Press working device, 33 ... Lower die, 3
4 ... upper mold, 50 ... lifter, 5
1 ... cushion pin, 52 ... elastic means,
53: guide member, 54: feed plate (conveying section), 55: first unloading plate (holding member),
56 ... second unloading plate (holding member), 57 ... third unloading plate (holding member), 59 ... pin (holding member),
Reference numeral 60: Extrusion plate, 61: Leading pin (pressing means), 63: Product chute, M: Servo motor (motor), W: Workpiece.

Claims (1)

(57) [Claims] 1. A press machine having a lower mold and an upper mold which is relatively movable toward and away from the lower mold. The workpiece is conveyed to at least two press working positions in the mold. A lifter disposed in the lower die and resiliently biased toward the upper die by elastic means, and extended along the transport direction of the workpiece provided on the lifter. A guide member which is slidably provided on the guide member; a holding member which is provided in the transfer portion for holding a workpiece; and a transfer member which is provided in the transfer portion and which is provided with the guide member. A motor for reciprocating along the upper die, and when the upper die relatively moves toward the lower die, pushes down the lifter against the elastic force of the elastic means to hold the lifter. Retract the member from the lower die machining surface Press type carrying device characterized by having a means depressed for.