Display device for press machine and method for monitoring press working

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 Art

[0002] There is a press machine that displays the slide operation and the operation of an accessory device using a circular image and sets these operations (for example, Patent Documents 1 and 2).

[0003] On the other hand, an accessory device, for example, a feeding device that feeds materials to a press machine in a sequential manner, receives a cam signal from the press machine and monitors the current feeding operation (for example, Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] [[ID=4б]] However, the inventions of Patent Documents 1 and 2 do not monitor the operation of the current accessory device, and the invention of Patent Document 3 depends on a cam signal, so only a part of the slide operation can be monitored. Furthermore, in the invention of Patent Document 3, only the time from the time when the material detection signal becomes ON to the time when the timing signal becomes OFF, or the angle obtained by converting the time, is displayed numerically, and it is difficult to grasp the temporal position of the signal for detecting the normal operation of the accessory device in relation to the time when the timing signal is ON.

[0006] Therefore, the present invention aims to provide a display device for a press machine and a method for monitoring press work that makes it easy for the operator to visually recognize the relationship between the current sliding motion 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 embodiments or applications.

[0008] [1] One embodiment 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 for generating multiple images and a display unit for displaying the multiple images, The aforementioned multiple images are, The first image is circular or arc-shaped and represents one step of the current slide motion, A second image shows the input range of the sensor signal corresponding to the operation of the auxiliary device linked to the press machine, Normal The aforementioned sensor signal Input The third image shows the area to be monitored, Includes, The second and third images are arc-shaped or fan-shaped images concentric with the first image. The second image is characterized in that it 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 for the press machine, The first image, the second image, and the third image constitute a single image set. The display unit displays multiple image sets simultaneously. The aforementioned auxiliary device is a feeding device that supplies material to the press machine in a sequential manner. Each of the two images in the aforementioned set of images can represent a different input range of sensor signals corresponding to the operation of the feeder.

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

[0011] [4] One embodiment of the method for monitoring press working according to the present invention is: The slide is raised and lowered to perform press working, and the auxiliary device is operated in conjunction with the press working. A first circular or arc-shaped image representing one step of the current sliding motion, and a second image representing the input range of the sensor signal corresponding to the operation of the auxiliary device, Normal The aforementioned sensor signal Input A third image representing the area to be monitored is displayed on the display unit. The second and third images are arc-shaped or fan-shaped images concentric with the first image. The second image is characterized in that it is displayed on the display unit for a predetermined period of time after the sensor signal has stopped. [Effects of the Invention]

[0012] According to one embodiment of the display device for a press machine and one embodiment of the method for monitoring press working according to the present invention, by displaying a first image in the shape of an annular or arc representing one stroke of the sliding motion, and second and third images concentrically, the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device. Furthermore, according to one embodiment of the display device for a press machine and one embodiment of the method for monitoring press working according to the present invention, since the second image is displayed on the display unit for a predetermined period after the sensor signal stops, the operator can easily visually recognize the relationship between the sliding motion and the operation of the auxiliary device even when the press machine is operating at high speed. As a result, the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device, allowing the SPM of the press machine and the operating speed of the auxiliary device to be set in a short time.

Brief Description of the Drawings

[0013] [Figure 1] It is a front view showing a press machine and a feeding device according to this embodiment. [Figure 2] It is a block diagram of a display device of a press machine according to this embodiment. [Figure 3] It is a view showing an enlarged display unit of a press machine according to this embodiment. [Figure 4] It is a view for explaining the difference in images for different settings. [Figure 5] It is a view showing an enlarged display unit of a press machine according to Modification 1. [Figure 6] It is a view showing an enlarged display unit of a press machine according to Modification 2. [Figure 7] It is a block diagram of a display device of a press machine according to Modification 3.

Modes for Carrying Out the Invention

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention described in the claims. Also, not all of the configurations described below are essential constituent elements of the present invention.

[0015] 1. Display Device of Press Machine The display device of the press machine according to this embodiment is a display device of a press machine including an arithmetic unit that generates a plurality of images and a display unit that displays the plurality of images. The plurality of images include a first image that is annular or arcuate and represents one stroke of the current slide operation, a second image that represents the input range of a sensor signal corresponding to the operation of an accessory device interlocked with the press machine, and a third image that represents the range for monitoring the sensor signal. The second image and the third image are arc-shaped or fan-shaped images concentric with the first image. The second image is arranged adjacent to the third image and is displayed on the display unit for a predetermined period after the sensor signal stops.

[0016] 1-1. Overview of Press Machines The overview of the press machine 1 will be explained using Figures 1 to 4. Figure 1 is a front view showing the press machine 1 and the feed device 72 according to this embodiment, Figure 2 is a block diagram of the 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 illustrating the differences in images for different settings.

[0017] As shown in Figure 1, the press machine 1 performs press working by converting the rotation of the electric motor 7 into the reciprocating linear motion of the slide 3 using 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. Various auxiliary devices attached to the press machine 1 are arranged adjacent to the press machine 1 for press working. The auxiliary device may be a feed device 72 that sequentially supplies the workpiece 74 to the press machine 1. In this embodiment, an example of a feed device 72 is described as an auxiliary device, but the present invention is not limited to this and can be applied to known auxiliary devices. Known auxiliary devices include, for example, articulated robots and knockout devices for material handling. The feed device 72 is linked to the press machine 1. The feed device 72 repeatedly performs a feed operation that intermittently feeds the workpiece 74 to the press machine 1.

[0018] The press machine 1 includes 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 multiple image sets 31 to 33 representing the relationship between the operation of the press machine 1 and its auxiliary devices. The press machine 1 may be a servo press machine or a mechanical press machine that further includes a clutch, flywheel, etc.

[0019] As the electric motor 7, an AC servo motor (either a synchronous or induction type 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 a crankshaft 5; a crank mechanism having an eccentric shaft can also be employed. Furthermore, as the eccentric mechanism 4, a known slide drive mechanism used in a press machine 1, such as a knuckle mechanism or a link mechanism, can be used. Alternatively, a mechanism having an eccentric plate integrated with the main gear can also be used. The crankshaft 5 rotates between the top dead center 17 and the bottom dead center 18 (shown by a dashed line in Figure 1) by the drive of the electric motor 7.

[0021] Molds (upper mold 13 and lower mold 14) are fixed to the bolster 2 and slide 3, respectively. Slide 3, which is connected to the lower end of the connecting rod 6, moves up and down relative to the bolster 2 by rotating the crankshaft 5 driven by the electric motor 7.

[0022] The feeding device 72 feeds, for example, a sheet of workpiece 7 between the upper die 13 and the lower die 14 in the open state. To feed the workpiece 74, the feed device 72 is positioned adjacent to the press machine 1. In Figure 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 hold the workpiece 74. The feed device 72 intermittently feeds the workpiece 74 a predetermined distance between the dies of the press machine 1 in accordance with the pressing operation, according to a preset feeding operation. The feed device 72 may also be equipped with an uncoiler 70 that holds the workpiece 74 and a plurality of sensors 76-78 for detecting various states related to the feeding operation. The feed device 72 may be retrofitted to the press machine 1 as an accessory device, or it may be provided as part of the press machine 1 from the start. The feed device 72 described here is an example of a feed device that feeds the workpiece 74 in one direction, but it may also be a known transfer device that holds and transports the workpiece 74 with a plurality of fingers attached to a feed bar. Furthermore, an example in which the feed device 72 includes a first sensor 76, a second sensor 77, and a third sensor 78 will be described, but it is not limited to this, and may also include other known sensors related to the feed operation.

[0023] The uncoiler 70 holds the sheet-like workpiece 74 by winding it into a coil, and feeds the coiled workpiece 74 to the feed device 72 at a constant speed by rotating it.

[0024] The first sensor 76 may be a so-called product discharge detector for confirming that a press-formed product has been discharged. The first sensor 76 is fixed to the press machine 1 and positioned where the product 75 discharged from the die passes. The first sensor 76 may be, for example, a photoelectric sensor having a light-emitting part and a light-receiving part, and may be configured to output a sensor signal when the product 75 blocks the light from the light-emitting part. The signal from the first sensor 76 is output to the display device 20 in accordance with the feeding operation of the workpiece material 74 which is linked to the press machine 1. The signal from the first sensor 76 is output from the time the product 75 blocks the light from the light-emitting part and the amount of light received by the light-receiving part changes until the product 75 passes through the first sensor 76 and the amount of light in the light-receiving part recovers. The display device 20, which receives this signal, can use a calculation unit 26, described later, to calculate the passage time of the product 75 as the angle of the crankshaft 5.

[0025] The second sensor 77 may be a so-called misfeed detector that has the function of confirming that the workpiece material 74 has been fed to a predetermined position (feeding complete) by the feed device 72. The second sensor 77 is fixed to the press machine 1, for example, and is positioned on the opposite side of the die from the feed device 72. The position of the second sensor 77 should be such that it can detect that the workpiece material 74 is at the feed completion position where the next press working process can begin. The second sensor 77 may be a contact type that detects by contacting the leading edge of the workpiece material 74 in the feeding direction, or it may be a non-contact type using an optical sensor or a magnetic sensor. The signal from the second sensor 77 is output from when the workpiece material 74 reaches the predetermined position until the product 75 is discharged from the die. The display device 20 that receives the signal can have its calculation unit 26 calculate the time during which the signal is received as the angle of the crankshaft 5.

[0026] The third sensor 78 may be a so-called scrap detector used to confirm that the scrap punched out during press working has been discharged. The third sensor 78 is fixed to the lower die 14 and positioned where the scrap passes when it 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 the light from the light-emitting part. The signal from the third sensor 78 is output while the discharged scrap passes through a predetermined range of the discharge part. The display device 20 that receives this signal can use the calculation unit 26 to calculate the discharge time of the scrap for which the signal was received as the angle of the crankshaft 5.

[0027] 1-2.Display device As shown in Figure 2, the display device 20 generates multiple images 40, 50, and 60 (Figure 3). The device comprises a calculation unit 26 and a display unit 22 that displays multiple images 40, 50, and 60. The display device 20 may further include an operation unit 24 that receives input operations for the display device 20 and a storage unit 28 that stores programs and the like. The display unit 22, operation unit 24, calculation unit 26, and storage unit 28 are electrically connected to each other. The display device 20 also transmits and receives electrical signals to and from the press machine 1 and can receive electrical signals from the first sensor 76, the second sensor 77, and the third sensor 78.

[0028] As shown in Figure 1, the display device 20 may be attached to the press machine 1, or it may be electrically connected to the press machine 1 and the feed device 72. The display device 20 may also be a control device for the press machine 1, which allows the operator of the press machine 1 to perform various settings and operations on 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 conventional detectors that acquire timing signals from the press machine 1. The display device 20 may also be a control device for the feed device 72, which performs various settings and operations on the feed device 72, or it may transmit and receive various signals to and from the feed device 72. The display device 20 may be part of the press machine 1, or it may be an external device that has electrical access to various parts of the press machine 1. The display device 20 may be housed in a single housing, or it may be housed in multiple separate housings.

[0029] The display unit 22 can display images stored in the storage unit 28 and images generated by the calculation unit 26. The display device 20 is described as part of the control device of the press machine 1, but is not limited to this; it may be a display device independent of the control device of the press machine 1. The display unit 22 may be, for example, the display of a portable terminal such as a tablet PC or 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 are equipped with communication functions for sending and receiving data. The display unit 22 is a liquid crystal display (LCD). Other known display devices (e.g., organic EL (Electro Luminescence)) may be used as the display unit 22. The display unit 22 may include various user interfaces (GUI (Graphical User Interface)) for the operator. You can display the price.

[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. Input operations to the operation unit 24 can be performed by touch operation. The touch panel type operation unit 24 can be operated by directly touching the display unit 22 with a finger or pen. As the touch panel, known types of touch panels such as resistive type, capacitive type, surface capacitive type, and projected capacitive type can be used. The operation unit 24 is not limited to a touch panel type integrated with the display unit 22; it may be a panel that can be attached to or detached from the display unit 22, or known input means (e.g., mouse, trackball, keyboard, etc.) provided separately from the display unit 22 may be used.

[0031] The arithmetic unit 26 is a CPU (Central Processing Unit) and can execute programs stored in the memory unit 28. The arithmetic unit 26 can generate images 40, 50, 60 (Figure 3), etc., and execute the process of displaying these generated images 40, 50, 60 on the display unit 22. The arithmetic unit 26 can also execute various processes according to the operator's input operations to the operation unit 24. The arithmetic unit 26 may also execute press working processes.

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

[0033] 1-3. Images As shown in Figure 1, the display unit 22 of the display device 20 can simultaneously display, for example, multiple image sets 31 to 33. Although Figure 1 shows three sets of image sets 31 to 33, one or more sets may be displayed in proportion to the number of sensors, as long as they are within the range that the operator can recognize. In the following description, the basic configuration of the three sets of image sets 31 to 33 is the same, so the first image set 31 will be described.

[0034] As shown in Figure 3, the first image set 31 is a collection of multiple images 40, 50, and 60. The multiple images 40, 50, and 60 include a first image 40 which is circular or arc-shaped and represents one step of the current slide operation, a second image 50 which represents the 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 which represents the range for monitoring the sensor signal. In the example in Figure 3, the first image 40, the second image 50, and the third image 60 constitute a single first image set 31. The first image 40, the second image 50, and the third image 60 may each be displayed in different colors, or they may be displayed in shades of the same color. Note that in Figure 3, different colors are represented by different shading due to drawing constraints.

[0035] The second image 50 and the third image 60 are arc-shaped or fan-shaped images concentric with the first image 40. They are displayed in the order of the second image 50 and the third image 60 from the outermost first image 40 inwards, but the order of the multiple images 40, 50, and 60 is not limited to this as long as they are concentric with the first image 40. The third image 60 represents a pre-set range and can therefore be displayed on the display unit 22 at all times. The first image 40 and the second image 50 display the current state, so a ring-shaped frame is displayed before the press work begins.

[0036] Image 1 40 is an arc-shaped image in which a circular black region gradually develops color as it extends, corresponding to the rotational movement of the eccentric mechanism 4 of the press machine 1, from the top dead center 17, through the bottom dead center 18, and back to the top dead center 17. In Image 1 40, the upper end 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 part of the control device of the press machine 1, the current slide movement can be accurately reflected in Image 1 40 based on information from sensors (not shown) of the press machine 1. That is, Image 1 40 can represent the slide movement in real time. The information from sensors (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 Figure 3, the first image 40 is in the shape of an arc as it approaches the end of one cycle. However, when the first image 40 reaches the top dead center 17, it is displayed as a ring shape. Beyond the top dead center 17, the first image 40 disappears and then gradually extends again, displaying color. The first image 40 is a wide, band-shaped image designed for easy recognition and is placed on the outermost periphery of the first image set 31. While the example of the first image 40 starting rotation from the top dead center 17 and returning to the top dead center 17 has been described, the example is not limited to this and can be an image corresponding to a cycle of other sliding movements. For example, the first image 40 may start rotating from a specified angle (set point) other than the top dead center 17, pass through the bottom dead center 18, and extend while displaying color as it returns to the specified angle (set point). It is not limited to clockwise rotation; it may also be counterclockwise rotation. Furthermore, for example, the first image 40 in pendulum operation may be an arc extending from one end of the pendulum between the top dead center 17 and the bottom dead center 18, through the bottom dead center 18, to the other end of the pendulum while emitting color, or it may be an arc extending from the other end of the pendulum to the first end of the pendulum while emitting color.

[0037] The second image 50 is placed, for example, adjacent to the third image 60. The adjacent placement of the second image 50 and the third image 60 makes it easier for the user to understand their correspondence. The second image 50 is displayed in a position between the outer first image 40 and the inner third image 60. (First image 40, second image) 50 and third image 60 The order from the center of the ring is not limited to the example in Figure 3. Also, first image 40, second image 50 and third image 60 The sensors may be spaced apart from each other to a degree that allows their relationship to be recognized. The second image 50 represents the input range of the sensor signal output by the first sensor 76 as the discharged product 75 passes through. The second image 50 displays the sensor signal input converted into a crank angle. Therefore, it is easy to compare with the sliding motion in 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 stops. Preferably, the predetermined period is longer than the time the sensor signal is input and ends before the sensor signal for the next cycle is input. The second image 50 is displayed for a longer period compared to the conventional method of displaying only for a short time while the sensor signal is input. Therefore, even when the press machine 1 is operating at high speed, the operator can easily visually recognize the relationship between the sliding motion and the operation of the auxiliary device (feeding device 72). And because the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device, the operator can set the SPM of the press machine and the operating speed of the auxiliary device in a short time.

[0038] The input start angle 50a in the second image 50 corresponds to the crank angle of the sliding motion when 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 product 75 passes through the first sensor 76 and the amount of light received by the light-receiving part recovers. 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 product 75 passed through the first sensor 76.

[0039] While the first image set 31 has been described so far, the second image 50 in the multiple image sets 31 to 33 can each represent the input range of different sensor signals corresponding to the operation of the feeder 72. For example, the second image 50 in the second image set 32 ​​can represent the input signal from the second sensor 77, and the second image 50 in the third image set 33 can represent the 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 identify abnormalities and change settings early.

[0040] The third image 60 is located inside the second image 50 and towards the center of the first image set 31. The third image 60 is a fan shape, which is 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, which is displayed in a fan shape, may be displayed in a different color than the third image 60. The third image 60 is set in advance of the press work. Preferably, 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 the range over which the sensor signal from the first sensor 76 is monitored during the sliding motion of one stroke. That is, the range of the crank angle corresponding to the angle of the third image 60 is the range over which the second image 50 is monitored. In Figure 3, the monitoring range is set from an angle about 15 degrees beyond the bottom dead center 18 (195 degrees) to about 15 degrees before the top dead center 17 (0 degrees, 360 degrees) (345 degrees). The monitored range indicates that the signal input from the first sensor 76 is normal. 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 way, by displaying the first image 40, which is circular or arc-shaped and represents one step of the sliding motion, and the second image 50 and third image 60, which are concentric with it, the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device.

[0041] For example, if the second image 50 is displayed near the center of the angular range of the third image 60, as shown in Figure 4(a), an error signal will be output even if the discharge of product 75 fluctuates slightly from cycle to cycle. This is less likely to happen, and the press machine 1 will not be stopped frequently. Therefore, if the SPM is changed to increase the production volume, the width of the second image 50 will become smaller and it will be displayed near the end of the third image 60, as shown in Figure 4(b). If the second image 50 is displayed towards the end of the third image 60 (closer to the top dead center 17), an error signal will be output even if the discharge of the product 75 is only slightly delayed, making it easy to stop production. Furthermore, if the SPM is changed to increase the production volume, the second image 50 will exceed the angular range of the third image 60, as shown in Figure 4(c), an error signal will be output and the press machine 1 will stop. The operator can set the 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 within what angle range it is displayed relative to the angle range of the third image 60. Based on this recognition, the operator can quickly and early in the production process change the feed rate of the workpiece 74 or change the SPM so that the second image 50 is positioned near the center of the angle range of the third image 60.

[0043] The memory unit 28 can store, for example, a second image 50 in a normal state and a second image 50 in which an error signal has been detected. The operator can display these second images 50 stored in the memory unit 28 on the display unit 22 and compare them to consider the cause of the error signal. For example, if the second image 50 with an error simply exceeds the end of the third image 60, it can be determined that the feed device 72 started operating late. Also, for example, if the second image 50 with an error has a wider angle range than the normal state, it can be determined that the workpiece material 74 is fluttering.

[0044] Furthermore, the second image 50 may be displayed by overlaying the second image 50 from the previous cycle and the second image 50 from the current cycle using different colors or shades for a predetermined time, for example, until the start of the next cycle. In this case, it is preferable to make the display of the second image 50 from the current cycle clearer than that from the previous cycle. By displaying the two second images 50 overlaid in this way, the operator can recognize variations in the timing of sensor signal inputs at an early stage.

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

[0046] The press working monitoring method according to this embodiment involves performing press working by raising and lowering the slide 3 with the press machine 1, and operating an auxiliary device, such as a feed device 72, in conjunction with the press working. The display unit 22 displays a first circular or arc-shaped image 40 representing one stroke of the current slide movement, a second image 50 representing the input range of the sensor signal corresponding to the operation of the auxiliary device, and a third image 60 representing the range for monitoring the sensor signal.

[0047] The sliding motion can be pre-set in the control device of the press machine 1, for example, the display device 20, before the press work. In addition, the operator can compare the second image 50 and the third image 60 displayed on the display unit 22 during the press work and change the SPM to an appropriate value.

[0048] The range for monitoring the sensor signal can be set in advance using the operation unit 24 of the display device 20 before the press working process. The set monitoring range is stored in the storage 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 the press working process begins.

[0049] When the press work begins, the first image 40 moves in accordance with the rotation of the crankshaft 5. It extends clockwise along the pre-set circular region. When a 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 pre-set circle as long as the signal from the first sensor 76 continues to be input. By simultaneously displaying the annular or arc-shaped first image 40 representing one step of the sliding motion, and the second image 50 and the third image 60 concentrically, the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device (feeder 72 in this embodiment).

[0050] Furthermore, the second image 50 is displayed on the display unit 22 for a predetermined period after the sensor signal stops. Because the second image 50 is displayed on the display unit 22 for a predetermined period after the sensor signal stops, the operator can easily visually recognize the relationship between the sliding motion and the operation of the auxiliary device even when the press machine 1 is operating at high speed. And because the operator can easily visually recognize the relationship between the current sliding motion and the operation of the auxiliary device, the SPM of the press machine 1 and the operating speed of the auxiliary device can be set in a short time.

[0051] 3. Variation 1 The display device 20 according to Modification 1 will be explained using Figures 1, 2, and 5. Figure 5 is an enlarged view of the display unit 22 of the press machine 1 according to Modification 1. Note that Modification 1 differs from the second image 50 shown in Figure 3 in that the second image 50 shown in Figure 5 is the same, so any other redundant explanations will be omitted.

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

[0053] As shown in Figure 5, the display unit 22 displays a second image 50 divided into multiple regions 51 to 53. The multiple regions 51 to 53 are displayed on the same circular image.

[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 higher brightness than the other regions 52 and 53 so that it is easier to recognize. The second region 52 is an image representing the average range of the sensor signal input range in past press working. The average range can be aggregated and calculated by the calculation unit 26. It is preferable to display the second region 52 in a brighter color or with higher brightness than the third region 53 so that it is easier to distinguish and recognize from the third region 53. The third region 53 is an image representing the range including the variation in the sensor signal input range in past press working. The range including the variation can be aggregated by the calculation unit 26 and calculated, 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 the information in this way, the operator can easily recognize where 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 variations (third region 53).

[0056] Conventionally, even if the input angle of the sensor signal is delayed and the feed error detection device determines it to be abnormal, causing the press machine to stop production, it is difficult to determine whether this is an accidental occurrence or a situation that could be prevented by settings. Furthermore, if production frequently stops due to a delay in the input angle of the sensor signal, it leads to a decrease in production volume. In Modification 1, the calculation unit 26 aggregates the input range of the sensor signal and displays it in the order of an average range (second region 52) and a range including variation (third region 53), making it possible to identify accidental delays in the input angle of the sensor signal, which were difficult to identify conventionally, in the first region 51. The operator can determine when the third region 53 is extending beyond the end of the third image 60. By changing settings such as feed rate and SPM, it is possible to prevent a decrease in production volume. In addition, it is possible to identify the trend of the input angle of sensor signals that occur by chance, allowing for the investigation of the cause.

[0057] Furthermore, the above-described method for monitoring press working can be performed using the display device 20 according to Modification 1.

[0058] 4. Variation 2 The display device 20 according to Modified Example 2 will be explained using Figures 1, 2, and 6. Figure 6 is an enlarged view of the display unit 22 of the press machine 1 according to Modified Example 2. Note that Modified Example 2 differs only in the arrangement of the multiple regions 51 to 53 shown in Figure 6 from the arrangement of the multiple regions 51 to 53 shown in Figure 5, so any other redundant explanations will be omitted.

[0059] As shown in Figure 6, multiple regions 51 to 53 are displayed concentrically with different radii. They are displayed in the order of the first region 51, the second region 52, and the third region 53 from the third image 60 side. The first region 51 is adjacent to the third image 60, making it easy to compare the feed operations in this cycle. Alternatively, the multiple regions 51 to 53 may be displayed sequentially from the first image 40 side. Since they are displayed as arcs of different radii, the multiple regions 51 to 53 are easy to distinguish. Furthermore, to make them easier to distinguish, the multiple regions 51 to 53 may be displayed in different colors or shades. The above press working monitoring method can be performed using the display device 20 according to the modified example 2.

[0060] 5. Variation 3 The display device 20a according to Modification 3 will be explained using Figure 7. Figure 7 is a block diagram of the display device 20a of the press machine 1 according to Modification 3. Note that the functions of each part of the display device 20a according to Modification 3 are basically the same as those of each part of the display device 20 shown in Figure 2, so redundant explanations will be omitted.

[0061] As shown in Figure 7, the display device 20a comprises 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. The frames surrounding the display unit 21a and the control unit 21b may also be housings. The display unit 21a is electrically connected to the control unit 21b, enabling it to send and receive electrical signals with the control unit 21b.

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

[0063] The control unit 21b may be positioned at a distance from the display unit 21a, or it may be positioned adjacent to the display unit 21a. Because the control unit 21b can be positioned independently of the display unit 21a, each unit has excellent flexibility in placement. The control unit 21b includes a calculation unit 26 and a storage unit 28. The control unit 21b is capable of sending 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 embodiments described above, and various further modifications are possible, including configurations that are substantially identical to the configurations described in the embodiments (configurations with the same function, method, 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. Furthermore, the present invention includes configurations that produce the same effects or achieve the same purpose as the configurations described in the embodiments. Furthermore, the present invention includes configurations that add known technology 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 region, 52…Second region, 53…Third region, 60…Third image, 70…Uncoiler, 72…Feeding device, 74…Workpiece material, 75…Product, 76…First sensor, 77…Second sensor, 78…Third sensor

Claims

1. A display device for a press machine comprising a calculation unit for generating multiple images and a display unit for displaying the multiple images, The aforementioned multiple images are, A first image, which is circular or arc-shaped, represents one step of the current slide motion, A second image shows the input range of the sensor signal corresponding to the operation of the auxiliary device linked to the press machine, A third image showing the range for monitoring the input of the normal sensor signal, Includes, The second and third images are arc-shaped or fan-shaped images concentric with the first image. The second image is a display device for a press machine, characterized in that it is displayed on the display unit for a predetermined period of time after the sensor signal has stopped.

2. In the display device for the press machine according to claim 1, The first image, the second image, and the third image constitute a single image set. The display unit displays multiple image sets simultaneously. The aforementioned auxiliary device is a feeding device that supplies material to the press machine in a sequential manner. A display device for a press machine, characterized in that the second image in the plurality of image sets each represents a different input range of sensor signals corresponding to the operation of the feed device.

3. In the display device for the press machine according to claim 1 or claim 2, The display device further includes a storage unit that stores the input range of the sensor signal for each press operation, The calculation unit aggregates the input ranges stored in the storage unit, and divides the second image into multiple regions according to the number of occurrences of the input ranges. The display unit is characterized by displaying the second image, which is divided into a plurality of regions, as a display device for a press machine.

4. The slide is raised and lowered to perform press working, and the auxiliary device is operated in conjunction with the press working. The display unit displays a first circular or arc-shaped image representing one step of the current sliding motion, a second image representing the input range of the sensor signal corresponding to the operation of the auxiliary device, and a third image representing the range for monitoring the input of the normal sensor signal. The second and third images are arc-shaped or fan-shaped images 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, in a method for monitoring press work.

Images