Display device for press machine and monitoring method for press process

Abstract

To provide a display device for a press machine that allows an operator to visually recognize the relationship between the current slide operation and the operation of an attachment device easily.SOLUTION: A display device for a press machine includes: a calculation unit that generates multiple images; and a display unit 22 that displays the images. The multiple images include: a first image 40 which has an annular or arc-shape and represents one cycle of the current slide operation; a second image 50 that represents the input range of sensor signals corresponding to the operation of an attachment device linked to the press machine; and a third image 60 that represents the range of monitoring the sensor signals. The second image 50 and third image 60 are arc-shaped or fan-shaped images concentric with the first image 40. The second image 50 is displayed on the display unit 22 for a predetermined period after the sensor signal stops.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a display device for a press machine and a method for monitoring press working. [Background technology]

[0002] A press machine is used in which a slide operation and an operation of an auxiliary device are displayed using a circular image and these operations are set (for example, Patent Documents 1 and 2).

[0003] On the other hand, an auxiliary device, for example a feed device that progressively supplies material to a press machine, receives a cam signal from the press machine and monitors the current feed operation (for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-179417 A [Patent Document 2] JP 2022-148406 A [Patent Document 3] JP 2019-181501 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the inventions of Patent Documents 1 and 2 do not monitor the current operation of the accessory device, and the invention of Patent Document 3 relies on the cam signal and can only monitor part of the slide movement. Furthermore, the invention of Patent Document 3 only displays the time from when the material detection signal turns ON to when the timing signal turns OFF, or the angle into which this time is converted, as a numerical value, making it difficult to grasp the time position of the signal that detects the normal operation of the accessory device in relation to the time when the timing signal is ON.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a display device for a press machine and a method for monitoring press working that allows an operator to easily visually recognize the relationship between the current slide operation and the operation of an auxiliary device. [Means for solving the problem]

[0007] The present invention has been made to solve at least some of the above-mentioned problems, and can be realized in the following aspects or application examples.

[0008] [1] One aspect of the display device for a press machine according to the present invention is A display device for a press machine comprising: a calculation unit that generates a plurality of images; and a display unit that displays the plurality of images, The plurality of images are a first image in the form of a ring or arc representing one stroke of a current slide movement; A second image showing a range of sensor signal inputs corresponding to operation of an accessory device associated with the press machine; A third image representing an area in which the sensor signal is monitored; Including, the second image and the third image are images in the shape of a circular arc or a sector concentric with the first image, The second image is displayed on the display unit for a predetermined period of time after the sensor signal has stopped.

[0009] [2] In one embodiment of the display device of the press machine, the first image, the second image, and the third image are an image set; the display unit simultaneously displays a plurality of image sets; the auxiliary device is a feed device that progressively feeds material to the press machine, The second images in the plurality of image sets may each represent a different sensor signal input range corresponding to operation of the feeder.

[0010] [3] In one embodiment of the display device of the press machine, The display device further includes a storage unit that stores the input range of the sensor signal for each press processing, The calculation unit counts the input ranges stored in the storage unit, and divides the second image into a plurality of regions according to the number of occurrences of the input ranges; The display unit can display the second image divided into the plurality of regions.

[0011] [4] One aspect of the method for monitoring press working according to the present invention comprises: The slide is raised and lowered to perform press working, and an auxiliary device is operated in conjunction with the press working, displaying on a display unit a first image having an annular or arc shape representing one stroke of a current slide operation, a second image representing an input range of a sensor signal corresponding to the operation of the accessory device, and a third image representing a range in which the sensor signal is monitored; the second image and the third image are images in the shape of a circular arc or a sector concentric with the first image, The second image is displayed on the display unit for a predetermined period of time after the sensor signal has stopped. Effect of the Invention

[0012] According to one aspect of the display device for the press machine and one aspect of the monitoring method for press working of the present invention, the second image and the third image are displayed concentrically with the first image in an annular or arc shape representing one stroke of the slide motion, so that the operator can easily visually recognize the relationship between the current slide motion and the motion of the accessory device. Also, according to one aspect of the display device for the press machine and one aspect of the monitoring method for press working of the present invention, the second image is displayed on the display unit for a predetermined period after the sensor signal stops, so that the operator can easily visually recognize the relationship between the slide motion and the motion of the accessory device even if the press machine operates at high speed. And, because the operator can easily visually recognize the relationship between the current slide motion and the motion of the accessory device, the operating speed of the SPM of the press machine and the accessory device can be set in a short time. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a front view showing the press machine and the feed device according to the embodiment. [Diagram 2] FIG. 2 is a block diagram of a display device of the press machine according to the present embodiment. [Diagram 3] FIG. 2 is an enlarged view of a display unit of the press machine according to the embodiment. [Figure 4] FIG. 13 is a diagram illustrating the difference in images for different settings. [Diagram 5] FIG. 4 is an enlarged view of a display unit of a press machine according to a first modified example. [Figure 6] FIG. 11 is an enlarged view of a display unit of a press machine according to Modification 2. [Figure 7] FIG. 11 is a block diagram of a display device of a press machine according to Modification 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Note that the embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are necessarily essential components of the present invention.

[0015] 1. Press machine display unit The display device of a press machine in this embodiment is a display device of a press machine equipped with a calculation unit that generates a plurality of images and a display unit that displays the plurality of images, wherein the plurality of images include a circular or arc-shaped first image representing one stroke of the current slide operation, a second image representing the input range of a sensor signal corresponding to the operation of an accessory device that is linked to the press machine, and a third image representing the range in which the sensor signal is monitored, wherein the second image and the third image are arc-shaped or fan-shaped images concentric with the first image, and the second image is arranged adjacent to the third image and is displayed on the display unit for a predetermined period of time after the sensor signal stops.

[0016] 1-1. Overview of press machines An overview of the press machine 1 will be described with reference to Figures 1 to 4. Figure 1 is a front view showing the press machine 1 and a feed device 72 according to this embodiment, Figure 2 is a block diagram of a display device 20 of the press machine 1 according to this embodiment, Figure 3 is an enlarged view of the display unit 22 of the press machine 1 according to this embodiment, and Figure 4 is a diagram explaining differences in images for different settings.

[0017] As shown in FIG. 1, the press machine 1 performs press processing by converting the rotation of an electric motor 7 into a reciprocating linear motion of a slide 3 by an eccentric mechanism 4 that converts rotational motion into linear motion. The press machine 1 is equipped with a display device 20, which will be described later. In order to perform press processing by the press machine 1, various auxiliary devices attached to the press machine 1 are arranged, for example, adjacent to the press machine 1. The auxiliary device may be a feed device 72 that supplies a workpiece 74 to the press machine 1 in a progressive manner. In this embodiment, an example of the feed device 72 will be described as an auxiliary device, but the present invention is not limited to this, and the present invention can be applied to a known auxiliary device. Examples of known auxiliary devices include an articulated robot for material transportation and a knockout device. The feed device 72 is linked to the press machine 1. The feed device 72 repeats a feed operation of intermittently feeding the workpiece 74 to the press machine 1.

[0018] The press machine 1 has an eccentric mechanism 4 having a crankshaft 5 and a connecting rod 6, an electric motor 7 that drives the eccentric mechanism 4, a reduction mechanism 8 that connects the eccentric mechanism 4 and the electric motor 7, and a display device 20 that displays a plurality of image sets 31-33 that show the relationship between the operations of the press machine 1 and auxiliary devices. The press machine 1 may be a servo press machine, or may be a mechanical press machine further having a clutch, a flywheel, etc.

[0019] As the electric motor 7, an AC servo motor (a synchronous motor or an induction motor can be selected), a DC servo motor, or the like can be used.

[0020] The eccentric mechanism 4 is not limited to a crank mechanism using the crankshaft 5, but may be a crank mechanism having an eccentric shaft. Also, a known slide drive mechanism used in the press machine 1, for example, a multiplying mechanism using a knuckle mechanism, a link mechanism, or the like, may be used as the eccentric mechanism 4. Also, a mechanism having an eccentric plate integrated with a main gear may be used. The crankshaft 5 rotates between top dead center 17 and bottom dead center 18 (shown by a broken line in FIG. 1) by being driven by the electric motor 7.

[0021] Dies (upper die 13, lower die 14) are fixed to the bolster 2 and the slide 3, respectively. The slide 3, which is connected to the lower end side of a connecting rod 6, moves up and down relative to the bolster 2 as a crankshaft 5 is rotated by the drive of an electric motor 7.

[0022] The feed device 72 feeds, for example, a sheet-shaped workpiece 7 between the upper die 13 and the lower die 14 in the open state. 4, the feed device 72 is disposed adjacent to the press machine 1. In FIG. 1, the feed device 72 is fixed to one side of the press machine 1. The feed device 72 in this embodiment is a so-called feed device equipped with a pair of rollers that sandwich the workpiece 74. The feed device 72 intermittently feeds the workpiece 74 by a predetermined distance between the dies of the press machine 1 in accordance with a preset feed operation in accordance with the press operation. The feed device 72 may be equipped with an uncoiler 70 that holds the workpiece 74 and a plurality of sensors 76 to 78 for detecting various conditions related to the feed operation. The feed device 72 may be attached to the press machine 1 as an auxiliary device, or may be equipped in advance as a part of the press machine 1. Although an example of the feed device that feeds the workpiece 74 in one direction will be described, the feed device 72 may be a known transfer device that holds and transports the workpiece 74 with a plurality of fingers attached to a feed bar. Further, an example in which the feed device 72 is provided with the first sensor 76, the second sensor 77, and the third sensor 78 will be described, however, this is not limiting and the feed device 72 may further include a known sensor related to the feed operation.

[0023] The uncoiler 70 holds a sheet-like material 74 wound in a coil shape, and rotates the coil-like material 74 to feed it to the feeder 72 at a constant speed.

[0024] The first sensor 76 may be a so-called product discharge detector for confirming that the pressed product has been discharged. The first sensor 76 is fixed to the press machine 1 and disposed at a position where the product 75 discharged from the die passes. The first sensor 76 may be, for example, a photoelectric sensor having a light emitting section and a light receiving section, and configured to output a sensor signal when the product 75 blocks light from the light emitting section. The signal of the first sensor 76 is output to the display device 20 in response to the feeding operation of the processed material 74 linked to the press machine 1. The signal of the first sensor 76 is output from the time when the product 75 blocks the light from the light emitting section and the amount of light received by the light receiving section changes until the product 75 passes the first sensor 76 and the amount of light in the light receiving section is restored. The display device 20 inputs the signal, and the calculation section 26 described later can calculate the passing time of the product 75 as the angle of the crankshaft 5.

[0025] The second sensor 77 may be a so-called misfeed detector having a function of confirming that the workpiece 74 has been fed to a predetermined position by the feed device 72 (feed completion). The second sensor 77 is fixed to the press machine 1, for example, and is disposed on the opposite side of the feed device 72 across the die. The second sensor 77 may be disposed at a position where it can detect that the workpiece 74 is at a feed completion position where the press working of the next step can be started. The second sensor 77 may be a contact type that detects by contacting the tip of the workpiece 74 in the feed direction, or may be a non-contact type that uses an optical sensor or a magnetic sensor. The signal of the second sensor 77 is output from the time the workpiece 74 reaches the predetermined position until the product 75 is discharged from the die. The display device 20 that receives the signal can have the calculation unit 26 calculate the time when the signal is input as the angle of the crankshaft 5.

[0026] The third sensor 78 may be a so-called scrap detector for confirming that the scrap punched out during the press working has been discharged. The third sensor 78 is fixed to the lower die 14 and disposed at a position through which the scrap passes when the scrap is discharged. The third sensor 78 may be, for example, a photoelectric sensor, and may be configured to output a sensor signal while the scrap blocks light from the light emitting section. The signal of the third sensor 78 is output while the discharged scrap passes through a predetermined range of the discharge section. The display device 20 that receives the signal can have the calculation unit 26 calculate the discharge time of the scrap for which the signal is input as the angle of the crankshaft 5.

[0027] 1-2.Display device As shown in FIG. 2, the display device 20 generates a number of images 40, 50, and 60 (FIG. 3). The display device 20 includes a calculation unit 26 and a display unit 22 that displays a plurality of images 40, 50, 60. The display device 20 may further include an operation unit 24 that accepts input operations to the display device 20, and a storage unit 28 that stores programs and the like. The display unit 22, the operation unit 24, the calculation unit 26, and the storage unit 28 are electrically connected to one another. The display device 20 transmits and receives electrical signals to and from the press machine 1, and is capable of receiving electrical signals from a first sensor 76, a second sensor 77, and a third sensor 78.

[0028] As shown in FIG. 1, the display device 20 may be attached to the press machine 1, and may be electrically connected to the press machine 1 and the feed device 72, for example. The display device 20 may be a control device for the press machine 1, which allows an operator who operates the press machine 1 to perform various settings and operations of the press machine 1. If the display device 20 is a control device for the press machine 1, it can generate images with higher accuracy than a conventional detector that obtains a timing signal from the press machine 1. The display device 20 may also be a control device for the feed device 72 that performs various settings and operations of the feed device 72, or may transmit and receive various signals to and from the feed device 72. The display device 20 may be a part of the press machine 1, or may be an external device that can electrically access each part of the press machine 1. The display device 20 may be housed in one housing, or may be housed separately in multiple housings.

[0029] The display unit 22 can display images stored in the memory unit 28 and images generated by the calculation unit 26. The display unit 20 will be described as a part of the control device of the press machine 1, but is not limited thereto, and may be a display device independent of the control device of the press machine 1. The display unit 22 may be a display of a portable terminal such as a tablet PC or a smartphone, and the portable terminal may further include some functions of the display device 20, such as the calculation unit 26. In that case, both the display unit 22 and the main body of the display device 20 have a communication function for transmitting and receiving data between them. The display unit 22 is a liquid crystal screen (LCD (Liquid Crystal Display)). Other known display devices (e.g., organic EL (Electro Luminescence), etc.) may be used as the display unit 22. The display unit 22 may include various user interfaces (GUIs (Graphical User Interfaces)) for the operator. You can display the interface.

[0030] The operation unit 24 is provided integrally with the display unit 22, for example. The operation unit 24 can be a touch panel type provided integrally with the display unit 22. An input operation to the operation unit 24 can be performed by a touch operation. The touch panel type operation unit 24 can be operated by directly touching the display unit 22 with a finger or a pen. As the touch panel, a known type of touch panel such as a resistive film type, a capacitive type, a surface type capacitive type, a projected type capacitive type, or the like can be used. The operation unit 24 is not limited to a touch panel type integrated with the display unit 22, but may be a panel detachable from the display unit 22, or may employ a known input means (e.g., a mouse, a trackball, a keyboard, or the like) provided separately from the display unit 22.

[0031] The calculation unit 26 is a CPU (Central Processing Unit) and can execute programs stored in the storage unit 28. The calculation unit 26 can execute a process of generating images 40, 50, 60 (FIG. 3) and the like and displaying the generated images 40, 50, 60 on the display unit 22. The calculation unit 26 can also execute various processes in accordance with an input operation by an operator to the operation unit 24. The calculation unit 26 may execute a press working process.

[0032] The storage unit 28 stores the program for the press machine 1, setting data for the range for monitoring the sensor signal, etc. When the display device 20 is a control device for the press machine 1, the calculation unit 26 outputs a command to a servo motor, which is the electric motor 7 in this case, according to the slide operation data stored and set in the storage unit 28, and the servo motor is driven according to this command. The slide 3 is moved according to preset slide movement data. The calculation unit 26 may also operate the feed device 72 according to the feed movement data stored and set in the storage unit 28. The storage unit 28 can store preset images and images 40, 50, 60, etc. generated by the calculation unit 26.

[0033] 1-3.Images As shown in Fig. 1, the display unit 22 of the display device 20 can simultaneously display, for example, a plurality of image sets 31 to 33. Although three image sets 31 to 33 are shown in Fig. 1, one or more sets may be displayed corresponding to the number of sensors within a range recognizable by the operator. In the following explanation, the three image sets 31 to 33 have the same basic configuration, so the first image set 31 will be explained.

[0034] As shown in FIG. 3, the first image set 31 is a collection of a plurality of images 40, 50, 60. The plurality of images 40, 50, 60 includes a first image 40 having an annular or arc shape that represents one stroke of the current slide operation, a second image 50 that represents an input range of a sensor signal corresponding to the operation of an auxiliary device (feed device 72 in this embodiment) that is linked to the press machine 1, and a third image 60 that represents a range in which the sensor signal is monitored. In the example of FIG. 3, the first image 40, the second image 50, and the third image 60 are one first image set 31. The first image 40, the second image 50, and the third image 60 may be displayed in different colors, or may be displayed in shades of the same color. Note that in FIG. 3, different colors are represented by different shading due to the constraints of the drawing.

[0035] The second image 50 and the third image 60 are arc-shaped or fan-shaped images concentric with the first image 40. The second image 50 and the third image 60 are displayed in this order from the first image 40 at the outermost periphery toward the inside, but the order of the multiple images 40, 50, 60 is not limited to this as long as they are concentric with the first image 40. The third image 60 represents a preset range and can therefore be displayed constantly on the display unit 22. The first image 40 and the second image 50 display the current state, and therefore annular frames are displayed before press working begins.

[0036] The first image 40 is an arc-shaped image in which an annular black area gradually develops color and extends from the top dead center 17 to the bottom dead center 18 and back to the top dead center 17 in response to the rotational operation of the eccentric mechanism 4 of the press machine 1. The upper end of the first image 40 corresponds to the top dead center 17 of the crankshaft 5, and the lower end corresponds to the bottom dead center 18 of the crankshaft 5. If the display device 20 is a part of the control device of the press machine 1, the current slide operation can be accurately reflected in the first image 40 based on information from a sensor (not shown) of the press machine 1. That is, the first image 40 can represent the slide operation in real time. Here, the information from the sensor (not shown) can be selected from, for example, rotation angle data from an encoder provided on the electric motor 7, rotation angle data from an encoder provided on the eccentric mechanism 4, and slide position information from a linear scale attached to the slide 3. In FIG. 3, the first image 40 is in the shape of an arc that is about to finish one stroke, but when the first image 40 reaches the top dead center 17, it is displayed in an annular shape, and when it passes the top dead center 17, the first image 40 disappears and then the color changes so that the arc gradually extends again. The first image 40 is a wide band-like image for easy recognition, and is arranged on the outermost periphery of the first image set 31. Although the example of the first image 40 starting to rotate from the top dead center 17 and returning to the top dead center 17 has been described, the present invention is not limited to this, and an image that matches one stroke of another sliding operation may be used. For example, the first image 40 may start to rotate from a specified angle (set point) other than the top dead center 17, pass through the bottom dead center 18, and extend while changing color so as to return to the specified angle (set point), and may rotate left instead of right. Also, for example, the first image 40 in pendulum operation may be an arc extending from one pendulum end between top dead center 17 and bottom dead center 18 via bottom dead center 18 to the other pendulum end while emitting color, or it may be an arc extending from the other pendulum end to the one pendulum end while emitting color.

[0037] The second image 50 is disposed adjacent to the third image 60, for example. By disposing the second image 50 and the third image 60 adjacent to each other, the operator can easily grasp their corresponding relationship. The second image 50 is displayed at a position sandwiched between the first image 40 on the outside and the third image 60 on the inside. The order of the first image 40, the second image 40, and the third image 50 from the center of the ring is not limited to the example of FIG. 3. The first image 40, the second image 40, and the third image 50 may be disposed apart from each other within a range where their relationship can be recognized. The second image 50 represents the input range of the sensor signal of the first sensor 76 output by the passage of the discharged product 75. The second image 50 is displayed by converting the input of the sensor signal into a crank angle. Therefore, it is easy to compare it with the sliding movement of the first image 40. The second image 50 is displayed on the display unit 22 for a predetermined period after the sensor signal output from the first sensor 76 is stopped. The predetermined period is preferably longer than the time during which the sensor signal is input and ends before the next cycle of the sensor signal is input. The second image 50 is displayed for a longer period of time compared to the conventional method in which the second image 50 is displayed only for the short period of time during which the sensor signal is input. Therefore, even if the press machine 1 operates at high speed, the operator can easily visually recognize the relationship between the slide operation and the operation of the accessory device (feed device 72). Since the operator can easily visually recognize the relationship between the current slide operation and the operation of the accessory device, the operator can set the operating speed of the SPM of the press machine and the accessory device in a short period of time.

[0038] The input start angle 50a of the second image 50 corresponds to the crank angle of the sliding motion when the product 75 blocks the light from the light-emitting part of the first sensor 76 and the amount of light received by the light-receiving part changes, and the input end angle 50b corresponds to the crank angle of the sliding motion when the product 75 passes the first sensor 76 and the amount of light in the light-receiving part is restored. Therefore, by comparing the second image 50 with the first image 40, it is possible to recognize at a glance at what angle of the sliding motion the product 75 passed the first sensor 76.

[0039] Although the first image set 31 has been described above, the second images 50 in the multiple image sets 31 to 33 can each represent an input range of a different sensor signal corresponding to the operation of the feed device 72. For example, the second image 50 in the second image set 32 ​​can represent an input signal from the second sensor 77, and the second image 50 in the third image set 33 can represent an input signal from the third sensor 78. By displaying the input ranges of different sensor signals side by side, the operator can comprehensively grasp the status of the auxiliary device. This allows the operator to accurately determine an abnormality and change the settings early.

[0040] The third image 60 is disposed inside the second image 50 and toward the center in the first image set 31. The third image 60 is a sector that is a part of a circle with a smaller radius than the second image 50. The remaining part of the circle other than the third image 60 displayed in the sector may be displayed in a color different from the third image 60. The third image 60 is set in advance prior to press processing. It is preferable that the third image 60 is always displayed while the first image set 31 is displayed on the display unit 22, for example, while the press machine 1 is in production. The third image 60 represents a range in which the sensor signal from the first sensor 76 in one stroke of the slide operation is monitored. That is, the range of the crank angle corresponding to the angle of the third image 60 is the range in which the second image 50 is monitored. In FIG. 3, the monitoring range is set from an angle (195 degrees) about 15 degrees beyond the bottom dead center 18 to about 15 degrees (345 degrees) before the top dead center 17 (0 degrees, 360 degrees). The monitored range means that the signal input from the first sensor 76 is normal, and if the signal input from the first sensor 76 exceeds this range, the calculation unit 26 displays an error signal image (not shown) on the display unit 22. In this manner, by displaying the second image 50 and the third image 60 concentrically with the annular or arc-shaped first image 40 representing one stroke of the slide movement, the operator can easily visually recognize the relationship between the current slide movement and the operation of the accessory device.

[0041] For example, if the second image 50 is displayed near the center of the angle range of the third image 60 as in FIG. 4(a), an error signal will not be output even if the discharge of the product 75 varies slightly from cycle to cycle. Therefore, when the SPM is changed to increase the production volume, the width of the second image 50 becomes small and is displayed near the end of the third image 60, as shown in FIG. 4(b). In a production in which the second image 50 is displayed on the end side of the third image 60 (closer to the top dead center 17), an error signal is output even if the discharge of the product 75 is slightly delayed, and production is likely to be stopped. Furthermore, when the SPM is changed to increase the production volume, the second image 50 exceeds the angle range of the third image 60, as shown in FIG. 4(c), an error signal is output, and the press machine 1 is stopped. The operator can set an appropriate SPM and feed rate while checking the position and range of the second image 50 relative to the third image 60.

[0042] Furthermore, when the second image 50 is displayed for a predetermined period of time, the operator can easily recognize where and to what extent the angle range of the third image 60 the second image 50 is displayed. Based on this recognition, the operator can perform operations such as changing the feed speed of the workpiece 74 or changing the SPM so that the second image 50 is positioned near the center of the angle range of the third image 60 in a short time and at an early stage of production.

[0043] The memory unit 28 can store, for example, the second image 50 in a normal state and the second image 50 in which an error signal has been confirmed. The operator can consider the cause of the error signal by displaying these second images 50 stored in the memory unit 28 on the display unit 22 and comparing them. For example, if the second image 50 in which an error has occurred simply exceeds the end of the third image 60, it can be determined that the start of operation of the feed device 72 is delayed. Also, for example, if the second image 50 in which an error has occurred has a wider angle range than the normal state, it can be determined that fluttering has occurred in the workpiece 74.

[0044] The second image 50 may be displayed in a different color or shade for a predetermined period of time, for example, until the start of the next cycle, with the second image 50 in the previous cycle and the second image 50 in the current cycle overlapping each other. In this case, it is preferable to make the display of the second image 50 in the current cycle easier to understand than that in the previous cycle. By displaying the two second images 50 overlapping each other in this manner, the operator can quickly recognize the variation in the input timing of the sensor signal.

[0045] 2. Method of monitoring press processing A method for monitoring press working using the press machine 1 and the display device 20 described in "1. Display Device of the Press Machine" will be described with reference to Figs. 1 to 3.

[0046] In the method for monitoring press processing in this embodiment, the slide 3 is raised and lowered by the press machine 1 to perform press processing, and an auxiliary device, such as a feed device 72, is operated in conjunction with the press processing, and a circular or arc-shaped first image 40 representing one stroke of the current slide movement, a second image 50 representing the input range of a sensor signal corresponding to the operation of the auxiliary device, and a third image 60 representing the range in which the sensor signal is monitored are displayed on the display unit 22.

[0047] The slide operation can be set in advance before press working using a control device of the press machine 1, for example, the display device 20. In addition, the operator can compare the second image 50 and the third image 60 displayed on the display unit 22 during press working and change the SPM to an appropriate value.

[0048] The range in which the sensor signal is monitored can be set in advance by the operation unit 24 of the display device 20 before press working. The set monitoring range is stored in the memory unit 28, and the calculation unit 26 calculates it as an angle range corresponding to the crank angle to generate the third image 60. The calculation unit 26 can display the third image 60 on the display unit 22 even before press working.

[0049] When the press work starts, the first image 40 is displayed in advance in accordance with the rotation of the crankshaft 5. When the signal from the first sensor 76 is input to the display device 20, the calculation unit 26 displays the second image 50 on the display unit 22. The second image 50 and the third image 60 are arc-shaped or fan-shaped images concentric with the first image 40. The second image 50 extends clockwise along a preset circle while the signal from the first sensor 76 continues to be input. By simultaneously displaying the second image 50 and the third image 60 concentrically with the annular or arc-shaped first image 40 representing one stroke of the slide movement, the operator can easily visually recognize the relationship between the current slide movement and the operation of the accessory device (the feed device 72 in this embodiment).

[0050] Furthermore, the second image 50 is displayed on the display unit 22 for a predetermined period of time after the sensor signal has stopped. Since the second image 50 is displayed on the display unit 22 for a predetermined period of time after the sensor signal has stopped, the operator can easily visually recognize the relationship between the slide motion and the motion of the accessory device even when the press machine 1 is operating at high speed. Furthermore, since the operator can easily visually recognize the relationship between the current slide motion and the motion of the accessory device, the operating speed of the SPM of the press machine 1 and the accessory device can be set in a short time.

[0051] 3. Variation 1 The display device 20 according to Modification 1 will be described with reference to Fig. 1, Fig. 2, and Fig. 5. Fig. 5 is an enlarged view of the display unit 22 of the press machine 1 according to Modification 1. Note that Modification 1 differs only in that the second image 50 shown in Fig. 5 is different from the second image 50 shown in Fig. 3, and therefore a duplicated description thereof will be omitted.

[0052] The display device 20 may further include a storage unit 28 that stores an input range of a sensor signal for each press process. The calculation unit 26 then counts up the input ranges stored in the storage unit 28, and divides the second image 50 into a plurality of regions 51 to 53 according to the occurrence number of the input ranges.

[0053] 5, the display unit 22 displays a second image 50 that is divided into a plurality of regions 51 to 53. The plurality of regions 51 to 53 are displayed on the same annular picture.

[0054] The first region 51 is an image representing the input range of the sensor signal from the first sensor 76 in the current cycle. It is preferable to display the first region 51 in a brighter color or with a higher brightness than the other regions 52 and 53, since it is easier to recognize. The second region 52 is an image representing the average range of the input range of the sensor signal in the past press working. The average range can be calculated by tallying up the second region 52. It is preferable to display the second region 52 in a brighter color or with a higher brightness than the third region 53, since it is easier to recognize it in distinction from the third region 53. The third region 53 is an image representing a range including the variation of the input range of the sensor signal in the past press working. The range including the variation can be calculated by tallying up the calculation unit 26, for example, as a range of 1σ (σ is the standard deviation). Furthermore, a range of 2σ may be displayed as the fourth region.

[0055] By displaying in this manner, the operator can easily recognize at what angle the input range of the sensor signal in the current cycle (first region 51) falls within the average range (second region 52) or the range including variation (third region 53).

[0056] Conventionally, even if the input angle of the sensor signal was delayed and the feed error detection device judged it to be abnormal and the press stopped production, it was difficult to determine whether the situation was accidental or could have been prevented by changing the settings. Furthermore, frequent stops in production due to delays in the input angle of the sensor signal lead to a drop in production volume. In the first modified example, the calculation unit 26 tally up the input range of the sensor signal and displays it separately into an average range (second area 52) and a range including variation (third area 53), making it possible to identify accidental delays in the input angle of the sensor signal from the first area 51, which was difficult to do in the past. The operator can determine whether the third area 53 is located beyond the end of the third image 60. It is possible to prevent a decline in production volume by changing the settings of the feed rate and SPM so that the feed rate does not decrease. In addition, it is possible to grasp the tendency of the input angle of the sensor signal that occurs accidentally, so the cause can be investigated.

[0057] Moreover, the display device 20 according to the first modification can be used to execute the above-mentioned method for monitoring press working.

[0058] 4. Variation 2 The display device 20 according to Modification 2 will be described with reference to Fig. 1, Fig. 2, and Fig. 6. Fig. 6 is an enlarged view of the display unit 22 of the press machine 1 according to Modification 2. Note that Modification 2 differs only in the arrangement of the multiple areas 51-53 shown in Fig. 6 from the arrangement of the multiple areas 51-53 shown in Fig. 5, and therefore a duplicated description thereof will be omitted.

[0059] As shown in FIG. 6, the multiple regions 51-53 are displayed concentrically with different radii. The first region 51, the second region 52, and the third region 53 are displayed in this order from the third image 60 side. The first region 51 is adjacent to the third image 60, so that it is easy to compare the feed operations in the current cycle. The multiple regions 51-53 may be displayed in order from the first image 40 side. Since the multiple regions 51-53 are displayed as arcs with different radii, the multiple regions 51-53 are easy to distinguish. The multiple regions 51-53 may be displayed in different colors or shades to make them easy to distinguish. The above-mentioned press working monitoring method can be executed using the display device 20 according to the second modification.

[0060] 5. Variation 3 A display device 20a according to Modification 3 will be described with reference to Fig. 7. Fig. 7 is a block diagram of the display device 20a of the press machine 1 according to Modification 3. Note that the functions of the respective parts of the display device 20a according to Modification 3 are basically the same as those of the respective parts of the display device 20 shown in Fig. 2, and therefore overlapping descriptions will be omitted.

[0061] As shown in Fig. 7, the display device 20a includes a display unit 21a and a control unit 21b. The display unit 21a may have a housing independent of the housing of the control unit 21b. Frames surrounding the display unit 21a and the control unit 21b may be housings. The display unit 21a is electrically connected to the control unit 21b, thereby enabling transmission and reception of electrical signals between the display unit 21a and the control unit 21b.

[0062] The display unit 21a includes a display section 22 and an operation section 24. The display unit 21a may be, for example, a liquid crystal screen equipped with a touch panel, or a tablet terminal equipped with a touch panel.

[0063] The control unit 21b may be disposed away from the display unit 21a, or may be disposed adjacent to the display unit 21a. Since the control unit 21b can be disposed independent of the display unit 21a, each unit has excellent freedom in location. The control unit 21b includes a calculation unit 26 and a storage unit 28. The control unit 21b is capable of transmitting and receiving electrical signals to and from the press machine 1, and is also capable of receiving electrical signals from the first sensor 76, the second sensor 77, and the third sensor 78.

[0064] The present invention is not limited to the above-described embodiments, and various modifications are possible, including configurations that are substantially the same as those described in the embodiments (configurations with the same functions, methods, and results, or configurations with the same purpose and effect). The present invention also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present invention also includes configurations that achieve the same effects as the configurations described in the embodiments, or configurations that can achieve the same purpose. The present invention also includes configurations in which publicly known technology is added to the configurations described in the embodiments. [Explanation of symbols]

[0065] 1...press machine, 2...bolster, 3...slide, 4...eccentric mechanism, 5...crankshaft, 6...connecting rod, 7...electric motor, 8...reduction mechanism, 13...upper die, 14...lower die, 17...top dead center, 18...bottom dead center, 20, 20a...display device, 21a...display unit, 21b...control unit, 22...display section, 24...operation section, 26...calculation section, 28...storage section, 31...first image set, 32...second image set, 33...third image set, 40...first image, 50...second image, 50a...input start angle, 50b...input end angle, 51...first area, 52...second area, 53...third area, 60...third image, 70...uncoiler, 72...feed device, 74...workpiece, 75...product, 76...first sensor, 77...second sensor, 78...third sensor

Claims

1. A display device for a press machine comprising: a calculation unit that generates a plurality of images; and a display unit that displays the plurality of images, The plurality of images are a first image having a circular or arc shape representing one stroke of a current slide motion; a second image representing a range of sensor signal inputs corresponding to operation of an accessory device associated with the press; a third image representing an area in which the sensor signal is monitored; Including, the second image and the third image are images in the shape of a circular arc or a sector concentric with the first image, The display device of a press machine, characterized in that the second image is displayed on the display unit for a predetermined period of time after the sensor signal has stopped.

2. The display device for the press machine according to claim 1, the first image, the second image, and the third image are an image set; the display unit simultaneously displays a plurality of image sets; the auxiliary device is a feed device that progressively feeds material to the press machine, The display device for a press machine, wherein the second images in the plurality of image sets each represent a different sensor signal input range corresponding to the operation of the feed device.

3. The display device for the press machine according to claim 1 or 2, The display device further includes a storage unit that stores the input range of the sensor signal for each press processing, The calculation unit counts the input ranges stored in the storage unit, and divides the second image into a plurality of regions according to the number of occurrences of the input ranges; The display device of a press machine, characterized in that the display unit displays the second image divided into the plurality of regions.

4. The slide is raised and lowered to perform press working, and an auxiliary device is operated in conjunction with the press working, displaying on a display unit a first image having an annular or arcuate shape representing one stroke of a current slide operation, a second image representing an input range of a sensor signal corresponding to an operation of the accessory device, and a third image representing a range in which the sensor signal is monitored; the second image and the third image are images in the shape of a circular arc or a sector concentric with the first image, A method for monitoring press working, characterized in that the second image is displayed on the display unit for a predetermined period of time after the sensor signal has stopped.

Images