JP5426509B2 - Servo press and operation method thereof - Google Patents

Description

  The present invention relates to a servo press and an operation method thereof. More specifically, the present invention relates to a servo press provided with a plurality of dies in a single process in a single press machine, and a method of operating with an optimum slide motion in the servo press.

  In order to form a product by pressing a work, it is necessary to sequentially perform various processes such as crushing, forming, and piercing. As a press that performs such multi-step processing, a plurality of dies corresponding to each step are arranged and mounted on a single press machine, and the workpiece is sequentially transferred to the dies of each step while pressing. Transfer type presses to be applied are known (for example, Patent Documents 1 and 2). In the transfer type press, the slide is moved up and down once (one stroke), so that a plurality of workpieces can be simultaneously pressed in different steps.

By the way, as shown in FIG. 4, as an example of performing multi-step processing, there is a case where crushing processing is performed in the first step, molding processing is performed in the second step, and piercing processing is performed in the third step. As described above, when multi-step processing is performed, different processing may be performed for each forming step, but the optimum slide motion (hereinafter referred to as “optimum motion”) is different for each processing. For example, the optimal motion in the crushing process in the first step is a motion (motion A) that moves the slide up and down quickly. On the other hand, the optimal motion in the molding process in the second step is a motion that raises and lowers the slide quickly before and after the mold and the workpiece contact, and slows the slide up and down while the mold and the workpiece are in contact ( Motion B). If the slide motion is not such, when complex molding is performed, the target shape is not molded or the material is damaged. Further, the optimum motion in the piercing process in the third step is a motion in which the ascending / descending speed of the slide is slowed while the mold and the workpiece are in contact, but the ascending / descending speed is faster than that of the forming process (motion C).
In order to operate the press with such an optimal motion, a servo press capable of finely controlling the movement of the slide is used.

However, since the servo press is equipped with a plurality of multi-process dies on one slide, it cannot be operated with an optimal motion for each molding process. Therefore, in the past, in some cases, there is a die that does not perform molding because the workpiece is not positioned. I was driving. For example, in the example shown in FIG. 4, the press is always operated with the motion B that takes the longest time for one stroke. Therefore, there has been a problem that productivity is lowered.
Also, in order to increase productivity, if the press is operated with a motion that takes a short time for one stroke (for example, motion A or motion C), in the molding process (for example, the second step) that takes a long time for one stroke. There was a problem that the quality of molding was impaired.

JP-A-7-164197 JP-A-10-166081

  In view of the above circumstances, an object of the present invention is to provide a servo press with high molding quality and high productivity, and an operation method thereof.

A servo press according to a first aspect of the present invention is a servo press comprising a plurality of molds, a slide having the plurality of molds mounted thereon, and a driving device for driving the slide, and whether or not there is a workpiece in each of the molds Detected by the workpiece distribution detection device from the workpiece distribution detection device for detecting the workpiece distribution, a storage device storing the slide motion corresponding to each workpiece distribution, and the slide motion stored in the storage device A slide motion selection unit that selects a slide motion corresponding to a work distribution; and a drive source control unit that controls the drive unit to drive the slide with the slide motion selected by the slide motion selection unit. Features.
A servo press according to a second aspect of the present invention comprises the carry-in device for carrying the workpiece into the press and the in-press transfer device for transferring the workpiece between the molds, and the workpiece distribution detection. The apparatus includes a workpiece detector that detects whether or not the workpiece is loaded on the loading device, a loading device operation detector that detects the operation of the loading device, and an in-press device that detects the operation of the in-press transfer device. It comprises a transfer device operation detector, and a workpiece distribution determination means for determining the workpiece distribution from detection signals of the workpiece detector, the carry-in device operation detector, and the in-press transfer device operation detector. .
The servo press operating method of the third invention is a servo press operating method comprising a plurality of molds and a slide having the plurality of molds mounted thereon, wherein the workpiece is the presence or absence of a workpiece in each mold. A distribution is detected, a slide motion corresponding to the detected workpiece distribution is selected from slide motions corresponding to each workpiece distribution stored in advance, and the slide is driven with the selected slide motion. To do.
According to a fourth aspect of the present invention, there is provided a servo press operating method according to the third aspect of the present invention, comprising: a loading device that loads the workpiece into the press; and a pressing device that transfers the workpiece between the molds. A method for detecting whether or not the workpiece is loaded on the loading device, detecting an operation of the loading device, detecting an operation of the in-press transfer device, and determining the workpiece distribution. And

According to the first invention, since the workpiece distribution is detected and the slide motion corresponding to the detected workpiece distribution is selected, the slide can always be driven with the optimum motion. Therefore, the quality of press molding can be maintained and product defects can be reduced. Further, the time required for one stroke of the slide can be shortened to increase productivity.
According to the second invention, it is possible to determine the work distribution from whether or not a work is loaded on the carry-in device and the operations of the carry-in device and the in-press transfer device. Therefore, the slide motion corresponding to the determined workpiece distribution can be selected, and the slide is always driven with the optimum motion, so that the quality of press molding can be maintained and the productivity can be increased.
According to the third invention, since the work distribution is detected and the slide motion corresponding to the detected work distribution is selected, the slide can always be driven with the optimum motion. Therefore, the quality of press molding can be maintained and product defects can be reduced. Further, the time required for one stroke of the slide can be shortened to increase productivity.
According to the fourth aspect of the present invention, it is possible to determine the work distribution from whether or not a work is loaded on the carry-in device and the operations of the carry-in device and the in-press transfer device. Therefore, the slide motion corresponding to the determined workpiece distribution can be selected, and the slide is always driven with the optimum motion, so that the quality of press molding can be maintained and the productivity can be increased.

It is structure explanatory drawing of the servo press which concerns on one Embodiment of this invention. It is the II-II arrow directional cross-sectional view in FIG. It is a relation explanatory drawing of work distribution and optimal motion. It is explanatory drawing of the optimal motion in three shaping | molding processes and each shaping | molding process. It is explanatory drawing of the motion which combined the motion A and the motion C. FIG.

Next, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, symbol B indicates a bed of the servo press P, and the lower molds C1, C2, and C3 in three steps are arranged on the upper surface of the lower die holder DH provided on the upper surface of the bed B. Is installed. The upper molds of the molds C1, C2, C3 are arranged and mounted on the lower surface of the upper die holder DH provided on the lower surface of the slide S. Here, the mold C1 is a mold that performs the press process in the first process, the mold C2 is a mold that performs the press process in the second process, and the mold C3 is a mold that performs the press process in the third process. The mold C1, the mold C2, and the mold C3 are arranged in this order.

The slide S is connected to the eccentric portion H of the eccentric shaft ES via a connecting rod CR. The eccentric shaft ES has a journal portion J supported rotatably on the crown CW. A main gear 12 of the driving device 10 is provided at the end of the eccentric shaft ES, and a pinion 11 a attached to the main shaft of the AC servomotor 11 is connected to the main gear 12. Therefore, when the AC servomotor 11 is driven, the slide S moves up and down, and the workpiece W that is a material to be molded can be pressed by the molds C1, C2, and C3.
Note that the rotational speed and direction of the AC servomotor 11 are controlled by the drive source control device 20.

  Further, the servo press P of the present embodiment is provided with a loading device 30 for loading the workpiece W into the press P. The carry-in device 30 is a belt conveyor, and workpieces W are loaded by a loading device (not shown), and the loaded workpieces W can be sequentially loaded into the press.

  Further, an intra-press transfer device 40 is provided between the bed B and the slide S so as to be connected to the carry-in device 30. As shown in FIG. 2, the in-press transfer device 40 includes two feed bars 41, 41 positioned before and after the molds C <b> 1, C <b> 2, C <b> 3, and workpieces W are placed on the feed bars 41, 41. A gripping claw 42 is attached. The in-press transfer device 40 can perform a three-dimensional operation of clamping, lifting, advance, down, unclamping, and returning by a driving device (not shown) to sequentially transfer the workpiece W between dies. More specifically, the work W carried into the press by the carry-in device 30 is transferred to the mold C1 in the first process, and at the same time, the work W that has been pressed by the mold C1 in the first process is transferred to the second process. The workpiece W that was transferred to the second mold C2 and pressed by the second process mold C2 was transferred to the third process mold C3, and was pressed by the third process mold C3. The workpiece W can be carried out of the press.

  As shown in FIG. 1, a work detector 51 that detects whether or not a work W is loaded on the carry-in device 30 is attached to the carry-in device 30. As the work detector 51, for example, a photoelectric sensor is used. The carry-in device 30 is provided with a carry-in device detector 52 that detects its operation. As the carry-in device operation detector 52, for example, an encoder or a linear sensor is used. Further, the in-press transfer device 40 is provided with an in-press transfer device operation detector 53 for detecting the operation thereof. The in-press transfer device operation detector 53 includes, for example, an encoder provided in a servo motor that drives the in-press transfer device 40, and a photoelectric sensor. The workpiece detector 51, the carry-in device operation detector 52, and the in-press transfer device operation detector 53 are connected to the control device 60, and the respective detection signals are input thereto.

The control device 60 includes a CPU, a storage device 63, and the like, and a work distribution determination unit 61 and a slide motion selection unit 62 are realized by reading a program.
The workpiece distribution determining means 61 determines the workpiece distribution which is the presence or absence of the workpiece W in each mold C1, C2, C3 from the detection signals from the workpiece detector 51, the carry-in device operation detector 52, and the in-press transfer device operation detector 53. judge. More specifically, first, the workpiece detector 51 detects that the workpiece W has been loaded on the carry-in device 30. Thereafter, the operation of the carry-in device 30 is detected by the carry-in device operation detector 52, and it is determined whether or not the workpiece W has been carried into the press from the conveyance distance. After the workpiece W has been carried into the press, the number of times the in-press transfer device 40 has transferred the workpiece W is detected by the in-press transfer device operation detector 53, and the workpiece W is placed in any of the molds C1, C2, C3. Determine if it is located. The above calculation is performed on all the workpieces W loaded on the carry-in device 30, and the presence / absence of the workpieces W in the molds C1, C2, C3 is determined.
The workpiece detector 51, the carrying-in device operation detector 52, the in-press transfer device operation detector 53, and the workpiece distribution determination means 61 correspond to the “work distribution detection device” described in the claims.

The storage device 63 stores a slide motion corresponding to each work distribution in advance.
As shown in FIG. 4, the case where the crushing process of the first process is performed with the mold C1, the molding process of the second process with the mold C2, and the piercing process of the third process with the mold C3 will be described. In this case, the optimal motion in the crushing process in the first step is a motion (motion A) that moves the slide S up and down quickly. The optimum motion in the molding process in the second step is to quickly raise and lower the slide S before and after the mold C2 and the workpiece W contact each other, and to slow the elevation speed of the slide S while the mold C2 and the workpiece W are in contact with each other. Motion (motion B). The optimum motion in the piercing process in the third step is a motion in which the ascending / descending speed of the slide S is slowed while the mold C3 and the workpiece W are in contact with each other, but the ascending / descending speed is faster than the forming process (motion C). . In each of the motions A, B, and C, the time required for one stroke is t _A , t _B , and t _C , t _B is the longest, and t _A is the shortest. Of the motions A, B, and C, the motion that is most difficult in molding is motion B, and the motion that is easiest in molding is motion A.

In this case, the slide motion corresponding to each work distribution is set as shown in FIG. 3, for example, and stored in the storage device 63.
Here, the slide motion stored in the storage device 63 is set to a motion that can cope with the most difficult step in forming among the steps in which the workpiece W is formed, that is, the optimum motion in each workpiece distribution. Therefore, specifically, when the workpiece W is located only in the mold C1 in the first process (pattern 1), the motion A in the first process is the optimal motion. Similarly, when the workpiece W is located in only one die among the dies C1, C2, and C3 in each process (patterns 1, 2, and 3), the die in which the workpiece W is located. The motion of the process performed in is the optimal motion. In addition, when the workpiece W is positioned on the mold C1 in the first process and the mold C2 in the second process (pattern 4), the motion B that can cope with the second process that is difficult to form becomes the optimal motion. . Similarly, when the work W is located in two or more dies among the dies C1, C2, and C3 in each step (patterns 4 to 7), the die of the die in which the work W is located The motion that can handle the most difficult process is the optimal motion.

  In the example shown in FIG. 3, the motion B that takes the longest time for one stroke is the most difficult motion in molding, but the optimal motion is not necessarily the motion that takes the longest time for one stroke. For example, when the workpiece is positioned on the first step mold C1 and the third step mold C3 (pattern 5), the motion A may be the optimum motion. This is because even if the piercing process of the third step is performed with motion A, the effect of the motion on the piercing process is small, so the quality of the molding can be maintained, and the motion A takes one stroke. This is because productivity can be increased because the time is short. In such a case, a motion combining the motion A and the motion C can be set as the optimum motion. The motion combining the motion A and the motion C is a motion that slows the descending speed of the slide S at the start of piercing as shown in FIG. If it does in this way, noise generation by contact with work W and metallic mold C3 at the time of piercing forming start can be controlled.

  In addition, a pendulum motion, a vibration motion (repetition of minute displacement), or the like can be set as the optimum motion. The pendulum motion is set when the slide S does not need to be fully stroked, and the time taken for one stroke can be shortened by reversing before the top dead center. The vibration motion is set in drawing or the like, and the thickness of the molded product can be made uniform.

  The slide motion selection unit 62 selects a slide motion corresponding to the work distribution determined by the work distribution determination unit 61 from the slide motions stored in the storage device 63. For example, when the workpiece distribution determining unit 61 determines that the workpiece W is positioned in the first step mold C1 and the second step mold C2 (pattern 4), the slide motion selecting unit 62 stores the storage device. 63 is searched, and motion B is selected as the slide motion corresponding to pattern 4.

  The control device 60 is connected to the drive source control device 20, and the slide motion selected by the slide motion selection means 62 is input to the drive source control device 20. Then, the drive source control device 20 controls the drive of the AC servo motor 11 according to the input slide motion. Therefore, the slide S operates with the optimum motion.

  Since the configuration is as described above, it is possible to detect the work distribution every time the slide S moves one stroke, and to drive the slide S with the slide motion corresponding to the work distribution. Therefore, the slide S can always be driven with the optimum motion in any work distribution. Therefore, the quality of press molding can be maintained and product defects can be reduced. Further, the time required for one stroke of the slide S can be shortened to increase the productivity. In particular, during unsteady operations such as starting and stopping during continuous feeding, the workpiece distribution is different from that during steady operation.

(Other embodiments)
In the above embodiment, the workpiece distribution is calculated by the workpiece distribution determination means 61 based on the detection signals from the workpiece detector 51, the loading device operation detector 52, and the in-press transfer device operation detector 53. However, the workpiece distribution is detected. As long as it can be used, a workpiece distribution detecting device having another configuration can be used.
For example, if a sensor for detecting the presence or absence of the workpiece W is attached to the claw 42 of the in-press transfer device 40, the workpiece distribution can be detected based on the detection signal of the sensor.

In the above-described embodiment, the three-step servo press has been described. However, two or more steps may be used. Even in this case, the same effect can be obtained.
Further, the servo press is not limited to the one using the connecting rod CR, and any servo press may be used as long as the operation of the slide S can be servo controlled.
Furthermore, the carry-in device 30 is not limited to a belt conveyor, but may be of another conveyance type.

C1, C2, C3 Mold 10 Drive device 20 Drive source control device 30 Carry-in device 40 In-press transfer device 51 Work detector 52 Carry-in device operation detector 53 In-press transfer device operation detector 60 Control device 61 Work distribution determination means 62 Slide motion selection means 63 Storage device

Claims (4)

A servo press comprising a plurality of molds, a slide having the plurality of molds mounted thereon, and a drive device for driving the slides,
A workpiece distribution detection device for detecting a workpiece distribution which is the presence or absence of a workpiece in each mold;
A storage device storing slide motion corresponding to each workpiece distribution;
Slide motion selection means for selecting a slide motion corresponding to the workpiece distribution detected by the workpiece distribution detection device from the slide motion stored in the storage device;
A servo press comprising: a drive source control device that controls the drive device to drive the slide with a slide motion selected by the slide motion selection means. A loading device for loading the workpiece into the press, and a transfer device within the press for transferring the workpiece between the molds,
The workpiece distribution detection device includes:
A workpiece detector for detecting whether or not the workpiece is loaded on the carry-in device;
A loading device operation detector for detecting the operation of the loading device;
In-press transfer device operation detector for detecting the operation of the in-press transfer device;
2. The servo press according to claim 1, further comprising: a workpiece distribution determining unit that determines the workpiece distribution from detection signals of the workpiece detector, the carry-in device operation detector, and the in-press transfer device operation detector. . An operating method of a servo press comprising a plurality of molds and a slide on which the plurality of molds are mounted,
Detecting a workpiece distribution that is the presence or absence of a workpiece in each mold,
Select the slide motion corresponding to the detected workpiece distribution from the slide motion corresponding to each workpiece distribution stored in advance,
A method of operating a servo press, wherein the slide is driven by the selected slide motion. An operation method of a servo press comprising a carry-in device for carrying the workpiece into a press and a transfer device in the press for transferring the workpiece between the molds,
Detecting whether the workpiece is loaded on the carry-in device;
Detecting the operation of the carry-in device;
Detecting the operation of the in-press transfer device;
The servo press operating method according to claim 3, wherein the work distribution is determined.

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