Display device for press machine and method for monitoring press working

Abstract

The invention provides a display device of a press machine, which enables an operator to visually recognize the relation between the current sliding block motion and the motion of an accessory device easily. A display device of a press machine includes: a calculation unit that generates a plurality of images; and a display unit (22) that displays the plurality of images. The plurality of images include: an annular or arcuate first image (40) indicating one stroke of the current slider operation, and a second image (50) indicating an input range of a sensor signal corresponding to the operation of an attachment device linked to the press; and a third image (60) indicating a range in which the sensor signal is monitored. The second image (50) and the third image (60) are arc-shaped or fan-shaped images concentric with the first image (40). After the sensor signal is stopped, the second image (50) is displayed on the display unit (22) for a predetermined time.

Description

Technical Field

[0001] The invention relates to a display device of a press machine and a monitoring method for stamping processing. Background Art

[0002] A press machine is used in which the movement of a slide and the movement of an attachment are displayed in a circular image and these movements are set (for example, Patent Documents 1 and 2).

[0003] On the other hand, an auxiliary device, such as a feeder that sequentially feeds materials to a press machine, receives a cam signal from the press machine and monitors the current feed operation (eg, Patent Document 3).

[0004] Prior art literature

[0005] Patent Literature

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-179417

[0007] [Patent Document 2] Japanese Patent Publication No. 2022-148406

[0008] [Patent Document 3] Japanese Patent Publication No. 2019-181501 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] However, the inventions of Patent Documents 1 and 2 do not monitor the current operation of the attachment, and the invention of Patent Document 3 relies on the cam signal, so it can only monitor a part of the slide operation. Furthermore, in the invention of Patent Document 3, the time from the time when the material detection signal is turned on to the time when the timing signal is turned off is only displayed as a numerical value, or the angle of the time is changed, and it is difficult to grasp the time position of the signal for detecting the normal operation of the attachment through the relationship with the time when the timing signal is turned on.

[0011] Therefore, an object of the present invention is to provide a display device for a press machine and a method for monitoring a press process, which allow an operator to visually easily recognize the relationship between the current movement of a slide and the movement of an auxiliary device.

[0012] Solutions to technical problems

[0013] The present invention has been made to solve at least a part of the above-mentioned problems, and can be implemented as the following aspects or application examples.

[0014] [1] An embodiment of a display device for a press machine according to the present invention comprises: a computing unit for generating a plurality of images; and a display unit for displaying the plurality of images; the plurality of images include: a first image in a ring or arc shape, which represents a stroke of a current slider movement; a second image, which represents an input range of a sensor signal corresponding to the movement of an auxiliary device linked to the press machine; and a third image, which represents a range for monitoring the sensor signal; the second image and the third image are arc-shaped or fan-shaped images that are concentric with the first image, and the second image is displayed on the display unit for a specified time after the sensor signal stops.

[0015] [2] In one embodiment of the display device of the press, the first image, the second image and the third image are an image group, the display unit displays multiple image groups simultaneously, the auxiliary device is a feeding device that sequentially supplies materials to the press, and the second images in the multiple image groups respectively represent input ranges of different sensor signals corresponding to the actions of the feeding device.

[0016] [3] In one embodiment of the display device of the press machine,

[0017] The display device includes a storage unit, which stores the input range of the sensor signal for each stamping process. The calculation unit totals the input ranges stored in the storage unit, divides the second image into multiple areas according to the number of input ranges generated, and the display unit is capable of displaying the second image divided into the multiple areas.

[0018] [4] An embodiment of the monitoring method for stamping processing according to the present invention is characterized in that: a slider is raised and lowered to perform stamping processing, and an auxiliary device is operated in conjunction with the stamping processing, and the following are displayed on the display unit: a first image in the shape of a ring or an arc representing a stroke of the current slider movement; a second image representing the input range of the sensor signal corresponding to the movement of the auxiliary device; and a third image representing the range for monitoring the sensor signal, wherein the second image and the third image are arc-shaped or fan-shaped images that are concentric with the first image, and the second image is displayed on the display unit for a specified time after the sensor signal stops.

[0019] Effects of the Invention

[0020] According to one embodiment of the display device of a press machine and one embodiment of the monitoring method of a stamping process of the present invention, the operator can easily visually recognize the relationship between the current slide movement and the movement of the attachment by displaying the second image and the third image concentrically with the first image in the shape of a ring or arc representing one stroke of the slide movement. Furthermore, according to one embodiment of the display device of a press machine and one embodiment of the monitoring method of a stamping process of the present invention, since the second image is displayed on the display unit after a predetermined period of time after the sensor signal stops, the operator can easily visually recognize the relationship between the slide movement and the movement of the attachment even if the press machine moves at a high speed. Furthermore, since the operator can easily visually recognize the relationship between the current slide movement and the movement of the attachment, the SPM of the press machine or the movement speed of the attachment can be set in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view showing the press machine and the feed device according to the present embodiment.

[0022] Figure 2 This is a block diagram showing a display device of a press machine according to the present embodiment.

[0023] Figure 3 It is an enlarged view showing a display unit of the press machine according to the present embodiment.

[0024] Figure 4 are diagrams illustrating the difference in images for different settings.

[0025] Figure 5 This is an enlarged view showing a display unit of a press machine according to Modification 1.

[0026] Figure 6 This is an enlarged view showing a display unit of a press machine according to Modification 2.

[0027] Figure 7 This is a block diagram showing a display device of a press machine according to Modification 3. DETAILED DESCRIPTION

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail using the accompanying drawings. In addition, the embodiments described below do not unduly limit the contents of the present invention described in the claims. Furthermore, the structures described below are not necessarily all necessary components of the present invention.

[0029] 1. Display device of press machine

[0030] The display device of the press involved in this embodiment comprises: a calculation unit for generating multiple images; and a display unit for displaying the multiple images; it is characterized in that the multiple images include: a first image in the shape of a ring or an arc, which represents a stroke of the current slider movement; a second image, which represents the input range of the sensor signal corresponding to the movement of the auxiliary device linked to the press; and a third image, which represents the range of monitoring the sensor signal; the second image and the third image are arc-shaped or fan-shaped images that are 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 specified time after the sensor signal stops.

[0031] 1-1. Overview of the press

[0032] use Figure 1-Figure 4 , an overview of the press machine 1 will be described. Figure 1 1 is a front view showing the press machine 1 and the feed device 72 according to the present embodiment. Figure 2 2 is a block diagram showing the display device 20 of the press machine 1 according to the present embodiment. Figure 3 2 is an enlarged view showing the display unit 22 of the press machine 1 according to the present embodiment. Figure 4 The following are diagrams illustrating the difference in images for different settings.

[0033] like Figure 1 As shown, the press machine 1 performs stamping by converting the rotation of the motor 7 into the reciprocating linear motion of the slider 3 through the eccentric mechanism 4 that converts the rotary motion into the linear motion. The press machine 1 is provided with a display device 20 described later. In order to perform the stamping process 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 also be a feeding device 72 that sequentially supplies the material to be processed 74 to the press machine 1. In the present embodiment, the example of the feeding device 72 is described as an auxiliary device, but it is not limited to this, and known auxiliary devices may be applied to the present invention. As a known auxiliary device, there is, for example, a multi-joint robot or a discharge device for material conveying. The feeding device 72 is linked to the press machine 1. The feeding device 72 repeatedly performs a feeding action of intermittently conveying the material to be processed 74 to the press machine 1.

[0034] The press machine 1 has an eccentric mechanism 4 having a crankshaft 5 and a connecting rod 6, a motor 7 driving the eccentric mechanism 4, a speed reduction mechanism 8 connecting the eccentric mechanism 4 and the motor 7, and a display device 20 displaying a plurality of image groups 31-33 representing the action relationship between the press machine 1 and the auxiliary device. The press machine 1 may be a servo press machine or a mechanical press machine further having a clutch, a flywheel, etc.

[0035] As the 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.

[0036] The eccentric mechanism 4 is not limited to a crank mechanism using a crankshaft 5, and a crank mechanism having an eccentric shaft may also be used. Furthermore, as the eccentric mechanism 4, a known slider drive mechanism used in the press 1 may be used, such as a force-increasing mechanism composed of a knuckle mechanism, a link mechanism, etc. Furthermore, a mechanism having an eccentric plate integrated with the main gear may also be used. The crankshaft 5 is driven by the motor 7 to move between the top dead center 17 and the bottom dead center 18 ( Figure 1 The device can rotate between the two (shown by the dashed line).

[0037] Molds (upper mold 13 and lower mold 14) are fixed to the backing plate 2 and the slider 3. The slider 3 connected to the lower end of the connecting rod 6 is moved up and down relative to the backing plate 2 by rotating the crankshaft 5 driven by the motor 7.

[0038] The feed device 72 is disposed adjacent to the press machine 1 in order to feed, for example, a sheet-shaped workpiece 74 between the upper die 13 and the lower die 14 in the mold opening state. Figure 1 In the embodiment, the feed device 72 is fixed on one side of the press 1. The feed device 72 in the present embodiment is a so-called feed device having a pair of rollers that clamp the work material 74. The feed device 72 intermittently delivers the work material 74 to the dies of the press 1 by a predetermined distance in accordance with a pre-set feeding action in coordination with a punching action. The feed device 72 may also include: an unwinder 70 that holds the work material 74; and a plurality of sensors 76-78 for detecting various states related to the feeding action. The feed device 72 may be installed on the press 1 as an auxiliary device, or may be pre-installed as a part of the press 1. Regarding the feed device 72, an example of a feed device that delivers the work material 74 in one direction is described, but it may also be a known transfer device that holds and transports the work material 74 using a plurality of fingers mounted on a feed rod. Furthermore, although the example in which the feeding device 72 includes the first sensor 76 , the second sensor 77 , and the third sensor 78 is described, the present invention is not limited thereto, and a known sensor related to the feeding operation may be included.

[0039] The uncoiler 70 winds a sheet-shaped workpiece 74 into a roll and holds it, and feeds the roll-shaped workpiece 74 to the feed device 72 at a constant speed by rotating the roll-shaped workpiece 74 .

[0040] The first sensor 76 may also be a so-called product discharge detector for confirming that the product after the stamping process is discharged. The first sensor 76 is fixed to the press machine 1 and is arranged at a position where the product 75 discharged from the mold passes. The first sensor 76 may also be configured as, for example, a photoelectric sensor, having a light emitting portion and a light receiving portion, and outputting a sensor signal by blocking the light from the light emitting portion by the product 75. The signal of the first sensor 76 is output to the display device 20 in response to the feeding action of the workpiece 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 of the light emitting portion and the amount of light received by the light receiving portion changes, until the product 75 passes through the first sensor 76 and the amount of light in the light receiving portion is restored. The calculation unit 26 described later of the display device 20 to which the signal is input can calculate the passage time of the product 75 as the angle of the crankshaft 5.

[0041] The second sensor 77 can be a so-called misfeed detector having the function of confirming that the work material 74 is sent to a predetermined position (feeding is completed) by the feed device 72. The second sensor 77 is fixed on the press machine 1, for example, and is arranged on the opposite side of the die sandwiching the feed device 72. The second sensor 77 can be arranged as long as it can detect the position where the work material 74 exists at the feed completion position of the stamping process where the next process can be started. The second sensor 77 can be a contact type that detects by contact with the front end of the feed direction of the work material 74, or a non-contact type using an optical sensor or a magnetic sensor. The signal of the second sensor 77 is output from the time when the work material 74 reaches the predetermined position until the product 75 is discharged from the die. The calculation unit 26 of the display device 20 that has input the signal can calculate the time when the signal is input as the angle of the crankshaft 5.

[0042] The third sensor 78 may also be a so-called scrap detector for confirming that the scrap punched out during the stamping process is discharged. The third sensor 78 is fixed to the lower die 14 and is arranged at a position where the scrap passes when the scrap is discharged. The third sensor 78 may also be configured as, for example, a photoelectric sensor that outputs a sensor signal during a period when the scrap blocks the light from the light-emitting portion. The signal of the third sensor 78 is output during a period when the discharged scrap passes through a specified range of the discharge portion. The computing unit 26 of the display device 20 that has received the signal can calculate the discharge time of the scrap to which the signal is input as the angle of the crankshaft 5.

[0043] 1-2. Display device

[0044] like Figure 2 As shown, the display device 20 has: generating a plurality of images 40, 50, 60 ( Figure 3) and a display unit 22 for displaying a plurality of images 40, 50, 60. Furthermore, the display device 20 may further include: an operation unit 24 for receiving input operations to the display device 20; and a storage unit 28 for storing programs, etc. The display unit 22, the operation unit 24, the operation unit 26, and the storage unit 28 are electrically connected to each other. Furthermore, the display device 20 transmits and receives electric signals with the press machine 1, and can receive electric signals from the first sensor 76, the second sensor 77, and the third sensor 78.

[0045] like Figure 1 As shown, the display device 20 can be installed on the press 1, for example, electrically connected to the press 1 and the feed device 72. The display device 20 can also be a control device for the press 1 for an operator who operates the press 1 to perform various settings and operations of the press 1. If the display device 20 is a control device for the press 1, it can generate a higher-precision image compared to a detector that obtains a timing signal from the press 1 as in the past. The display device 20 can be a control device for the feed device 72 that further performs various settings and operations of the feed device 72, or it can be a device that sends and receives various signals to the feed device 72. The display device 20 can be a part of the press 1, or it can be an external device that can electrically access various parts of the press 1. The display device 20 can be housed in one frame, or it can be divided into multiple frames for housing.

[0046] The display unit 22 can display images stored in the storage unit 28 and images generated by the operation unit 26. Although the display device 20 is described as a part of the control device of the press 1, it is not limited to this and can also be a display device independent of the control device of the press 1. The display unit 22 can be a display of a portable terminal such as a tablet or a smart phone, and the portable terminal can also have some functions of the display device 20 such as the operation unit 26. In this case, both parties have a communication function for sending and receiving data between the display unit 22 and the main body of the display device 20. The display unit 22 is a liquid crystal screen (LCD (Liquid Crystal Display)). As the display unit 22, other well-known display devices (such as organic EL (Electro luminescence (electro luminescence)) etc.) can also be used. The display unit 22 can display various user interfaces (GUI (Graphical User Interface)) for the operator.

[0047] The operation unit 24 is, for example, provided integrally with the display unit 22. The operation unit 24 may be a touch panel type provided integrally with the display unit 22. Input operations to the operation unit 24 may be performed by touch operations. 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 touch panel of a known type such as a resistive film type, an electrostatic capacitance type, a surface type electrostatic capacitance type, a projected type electrostatic capacitance type, etc. may be used. The operation unit 24 is not limited to a touch panel type integrated with the display unit 22, and may be a panel that is detachable from the display unit 22, or may be a known input member (such as a mouse, a trackball, a keyboard, etc.) provided separately from the display unit 22.

[0048] The computing unit 26 is a CPU (Central Processing Unit) and can execute programs stored in the storage unit 28. The computing unit 26 generates images 40, 50, 60 ( Figure 3 ) etc., and can execute processing to display the generated images 40, 50, 60 on the display unit 22. Furthermore, the calculation unit 26 can execute various processing according to the input operation of the operator to the operation unit 24. The calculation unit 26 can also execute processing of stamping.

[0049] The storage unit 28 stores the program of the press machine 1, the setting data of the range of monitoring sensor signals, etc. In the case where the display device 20 is a control device of the press machine 1, the operation unit 26 outputs a command to the servo motor as the motor 7 in this case according to the data of the slide movement stored and set in the storage unit 28, and the servo motor is driven according to the command, thereby moving the slide 3 according to the preset slide movement data. In addition, the operation unit 26 can 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 the preset images and the images 40, 50, 60, etc. generated by the operation unit 26.

[0050] 1-3. Image

[0051] like Figure 1 As shown, the display unit 22 of the display device 20 can display multiple image groups 31-33 at the same time. Figure 1 3 sets of image groups 31-33 are shown in FIG. 3 , but if there are more than one set, they can also be displayed in accordance with the number of sensors within the range that the operator can recognize. In the following description, since the basic structures of the three sets of image groups 31-33 are the same, the first image group 31 will be described.

[0052] like Figure 3As shown, the first image group 31 is a collection of multiple images 40, 50, 60. The multiple images 40, 50, 60 include: a first image 40 in a circular or arc shape, which represents a stroke of the current slide action; a second image 50, which represents the input range of the sensor signal corresponding to the action of the auxiliary device (in this embodiment, the feed device 72) linked to the press machine 1; and a third image 60, which represents the range of monitoring the sensor signal. Figure 3 In the example of , the first image 40, the second image 50, and the third image 60 are a first image group 31. The first image 40, the second image 50, and the third image 60 may be displayed in different colors, or in shades of the same color. Figure 3 In the figure, due to the limitations of the attached figure, different grids are used to represent different colors.

[0053] The second image 50 and the third image 60 are arc-shaped or sector-shaped images that are concentric with the first image 40. The second image 50 and the third image 60 are sequentially displayed from the outermost first image 40 toward the inner side, but the order of the plurality of images 40, 50, 60 is not limited to this if they are concentric with the first image 40. The third image 60 indicates a preset range, so it can be always displayed on the display unit 22. Since the first image 40 and the second image 50 show the current state, a ring-shaped frame is displayed before the punching process starts.

[0054] The first image 40 is an arc-shaped image in which a circular black area is gradually colored and extended in a manner corresponding to the rotational movement of the eccentric mechanism 4 of the press machine 1 from the top dead center 17 to the bottom dead center 18 and then back to the top dead center 17. 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. In a case where the display device 20 is part of the control device of the press machine 1, the current slider movement can be accurately reflected in the first image 40 based on information from a sensor not shown in the figure of the press machine 1. That is, the first image 40 can represent the real-time slider movement. Here, as information from a sensor not shown in the figure, for example, it is possible to select from rotation angle data from an encoder provided on the motor 7, rotation angle data from an encoder provided on the eccentric mechanism 4, and slider position information from a linear scale installed on the slider 3. Figure 3In the figure, the first image 40 is an arc shape that will end in a short while, but when the first image 40 reaches the top dead point 17, it is displayed as a ring shape, and when it exceeds the top dead point 17, it is colored in such a way that the arc gradually extends again after the first image 40 disappears. The first image 40 is a wide band image that is easily recognizable and is arranged at the outermost periphery of the first image group 31. An example in which the first image 40 rotates from the top dead point 17 and returns to the top dead point 17 is described, but it is not limited to this, and it can be an image that matches a stroke of other slider actions. For example, the first image 40 can rotate from a specified angle (set point) other than the top dead point 17, return to the specified angle (the set point) via the bottom dead point 18, and be colored and extended, or it can be turned left instead of right. Furthermore, for example, the first image 40 of the vibrator operation can be an arc that is colored and extends from one vibrator end located between the upper dead point 17 and the lower dead point 18 to the other vibrator end via the lower dead point 18, or can be an arc that is colored and extends from the other vibrator end to one vibrator end.

[0055] The second image 50 is arranged adjacent to the third image 60, for example. Since the second image 50 and the third image 60 are connected to each other, the operator can easily understand the corresponding relationship between them. 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 50, and the third image 60 from the center of the ring is not limited to Figure 3 . In addition, the first image 40, the second image 50, and the third image 60 may be arranged separately from each other within a range in which the relationship between them can be identified. The second image 50 indicates the input range of the sensor signal of the first sensor 76 output due to the passage of the discharged product 75. The second image 50 converts the input of the sensor signal into a crank angle for display. Therefore, it is easy to compare with the slide action 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 stops. It is preferred that the predetermined period is longer than the input time of the sensor signal and ends before the input of the sensor signal of the next cycle. Compared with the short time of displaying the sensor signal input as in the past, the second image 50 is displayed for a long time. Therefore, even if the press machine 1 moves at a high speed, the operator can easily visually recognize the relationship between the slide action and the action of the attachment (feeding device 72). In addition, by making it easy for the operator to visually recognize the relationship between the current slide action and the action of the attachment, the operator can set the SPM of the press machine or the action speed of the attachment in a short time.

[0056] The input start angle 50a of the second image 50 corresponds to the crank angle of the slider movement when the product 75 blocks the light of 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 slider movement when the product 75 passes through 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 which angle of the slider movement the product 75 passes through the first sensor 76.

[0057] In addition, although the first image group 31 has been described so far, the second images 50 in the plurality of image groups 31-33 may respectively represent input ranges of different sensor signals corresponding to the operation of the feed device 72. For example, the second image 50 of the second image group 32 may represent an input signal from the second sensor 77, and the second image 50 of the third image group 33 may represent an input signal from the third sensor 78. By arranging and displaying the input ranges of different sensor signals, the operator can comprehensively grasp the status of the attachment. As a result, the operator can accurately judge abnormalities and change the settings as soon as possible.

[0058] The third image 60 is arranged on the inner side of the second image 50 and on the center side of the first image group 31. The third image 60 is a sector of a part of a circle having 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 also be displayed in a color different from that of the third image 60. The third image 60 is preset before the stamping process. The third image 60 is preferably always displayed while the first image group 31 is displayed on the display unit 22, for example, during the production process of the press machine 1. The third image 60 indicates the range of monitoring the sensor signal from the first sensor 76 during the slider movement of one stroke. That is, the range of the crank angle corresponding to the angle of the third image 60 is the range of monitoring the second image 50. Figure 3 In the embodiment, the range from the angle of about 15 degrees (195 degrees) exceeding the bottom dead center 18 to about 15 degrees (345 degrees) before the top dead center 17 (0 degrees, 360 degrees) is monitored. The monitored range means that the signal input from the first sensor 76 is normal. When the signal input from the first sensor 76 exceeds the range, the calculation unit 26 displays an error signal image (not shown) on the display unit 22. In this way, by displaying the second image 50 and the third image 60 concentrically with the first image 40 in the shape of a ring or arc representing one stroke of the slide movement, the operator can easily visually recognize the relationship between the current slide movement and the movement of the attachment.

[0059] For example, Figure 4As shown in (a), if the second image 50 is displayed near the center of the angle range of the third image 60, even if the discharge of the product 75 varies slightly in each cycle, it is difficult to output an error signal and the press machine 1 will not be stopped frequently. Therefore, when the SPM is changed to increase the output, as shown in FIG. Figure 4 As shown in (b), the width of the second image 50 becomes smaller and is displayed near the end of the third image 60. If the second image 50 is displayed at the end side of the third image 60 (close to the top dead center 17), an error signal will be output if the discharge of the product 75 is slightly delayed, and production is likely to be stopped. If the SPM is further changed to increase the production, Figure 4 As shown in (c), the second image 50 exceeds the angle range of the third image 60, an error signal is output, and the press machine 1 stops. The operator can set an appropriate SPM or feed speed while confirming the position and range of the second image 50 relative to the third image 60.

[0060] Furthermore, when the second image 50 is displayed within a predetermined period, the operator can easily recognize which area and how much angle range is displayed in the angle range of the third image 60. Based on this recognition, the operator can change the feed speed of the workpiece 74, change the SPM, etc. in a short time and at an early stage of production so that the second image 50 is located near the center of the angle range of the third image 60.

[0061] The storage unit 28 can store, for example, the second image 50 of the normal state and the second image 50 in which the error signal is confirmed. The operator displays the second images 50 stored in the storage unit 28 on the display unit 22, and can examine the cause of the error signal by observing and comparing. For example, when the second image 50 showing the error just exceeds the terminal of the third image 60, it can be determined that the start of the action of the feed device 72 is delayed. Furthermore, when the second image 50 showing the error has a larger angle range than the normal state, it can be determined that a deviation has occurred in the workpiece 74.

[0062] Furthermore, the second image 50 may be displayed by overlapping the second image 50 of the previous cycle and the second image 50 of the current cycle in different colors or different shades for a predetermined period, for example, until the next cycle starts. In this case, it is preferred that the display of the second image 50 of the current cycle is easier to understand than that of the previous cycle. By overlapping and displaying the two second images 50 in this way, the operator can recognize the deviation of the input timing of the sensor signal at an early stage.

[0063] 2. Monitoring method of stamping process

[0064] Using the press machine 1 and the display device 20 described in "1. Display device of press machine", refer to Figure 1-Figure 3The following describes a method for monitoring stamping processing.

[0065] The monitoring method of stamping processing involved in this embodiment utilizes a press machine 1 to raise and lower the slider 3 to perform stamping processing, and operates an auxiliary device such as a feed device 72 in conjunction with the stamping processing, and displays on the display unit 22: a first image 40 in a circular or arc shape, which represents a stroke of the current slider movement; a second image 50, which represents the input range of the sensor signal corresponding to the movement of the auxiliary device; and a third image 60, which represents the range of monitoring the sensor signal.

[0066] The slide motion can be set before the press working by using the control device of the press machine 1, for example, the display device 20. Furthermore, the operator can change the SPM to an appropriate value by observing and comparing the second image 50 and the third image 60 displayed on the display unit 22 during the press working.

[0067] The range for monitoring the sensor signal can be set in advance before the stamping process through the operation unit 24 of the display device 20. The set monitoring range is stored in the storage unit 28, and the calculation unit 26 calculates the 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 from before the stamping process.

[0068] When the stamping process starts, the first image 40 extends to the right along the pre-set annular area in coordination with the rotation of the crankshaft 5. When the signal from the first sensor 76 is input to the display device 20, the operation 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 that are concentric with the first image 40. While the signal from the first sensor 76 continues to be input, the second image 50 extends to the right along the pre-set circle. By simultaneously displaying the second image 50 and the third image 60 in a concentric circle with the annular or arc-shaped first image 40 representing one stroke of the slider action, the operator can easily visually recognize the relationship between the current slider action and the action of the auxiliary device (the feed device 72 in this embodiment).

[0069] Furthermore, the second image 50 is displayed on the display unit 22 for a predetermined time after the sensor signal stops. Since the second image 50 is displayed on the display unit 22 for a predetermined time after the sensor signal stops, the operator can easily visually recognize the relationship between the slide movement and the movement of the attachment even if the press machine 1 moves at a high speed. Furthermore, since the operator can easily visually recognize the relationship between the current slide movement and the movement of the attachment, the SPM of the press machine 1 or the movement speed of the attachment can be set in a short time.

[0070] 3. Modification 1

[0071] use Figure 1 , Figure 2 and Figure 5 , a display device 20 according to variation 1 is described. Figure 5 2 is an enlarged view showing the display unit 22 of the press machine 1 according to Modification 1. Figure 5 The second image 50 shown is Figure 3 The second image 50 shown is different, and therefore repeated descriptions other than that will be omitted.

[0072] The display device 20 may further include a storage unit 28 that stores the input range of the sensor signal for each punching process. Then, the calculation unit 26 totals the input ranges stored in the storage unit 28 and divides the second image 50 into a plurality of regions 51-53 according to the number of generated input ranges.

[0073] like Figure 5 As shown, the display unit 22 displays the second image 50 divided into a plurality of regions 51 to 53. The plurality of regions 51 to 53 are displayed on the same donut graph.

[0074] The first area 51 is an image representing the input range of the sensor signal from the first sensor 76 in the current cycle. The first area 51 is displayed with a brighter color or higher brightness than the other areas 52 and 53, which is easy to identify and is therefore preferred. The second area 52 is an image representing the average range of the input range of the sensor signal of the past stamping process. The average range can be summed and calculated by the operation unit 26. The second area 52 is displayed with a brighter color or higher brightness than the third area 53, which is different from the third area 53 and is easy to identify, and is therefore preferred. The third area 53 is an image representing the range of deviations of the input range of the sensor signal in the past stamping process. The operation unit 26 sums the range including the deviation and can calculate it as a range of 1σ (σ is the standard deviation), for example. In addition, the range of 2σ can be displayed as the fourth area.

[0075] This display allows the operator to easily recognize whether the input range (first region 51) of the sensor signal in this cycle falls within the average range (second region 52) or the angle of the range containing the deviation (third region 53).

[0076] In the past, even if the input angle of the sensor signal is delayed, the feed error detection device is judged as abnormal, and the press stops production, it is difficult to determine whether it is an accidental situation or a situation that can be prevented by setting. In addition, if the input angle of the sensor signal is delayed and production is frequently stopped, it will lead to a decrease in production. In modification 1, the operation unit 26 totals the input range of the sensor signal, divides and displays the average range (the second area 52) and the range containing the deviation (the third area 53), thereby being able to identify the accidental delay in the input angle of the sensor signal that was previously difficult through the first area 51. The operator can prevent a decrease in production by changing the setting of the third area 53 to a feed speed or SPM that does not deviate from the terminal of the third image 60. Furthermore, since the tendency of the input angle of the sensor signal that occurs accidentally can be grasped, the cause can be found.

[0077] Furthermore, the above-mentioned press working monitoring method can be executed using the display device 20 according to the first modification.

[0078] 4. Modification 2

[0079] use Figure 1 , Figure 2 and Figure 6 , a display device 20 according to variation 2 is described. Figure 6 2 is an enlarged view showing the display unit 22 of the press machine 1 according to Modification 2. Figure 6 The configuration of the multiple regions 51-53 shown is similar to Figure 5 The configurations of the plurality of regions 51 to 53 shown are different, and therefore repeated descriptions other than these are omitted.

[0080] like Figure 6 As shown, multiple areas 51-53 are displayed in concentric circles with different radii. The first area 51, the second area 52, and the third area 53 are displayed in sequence from the side of the third image 60. Since the first area 51 is adjacent to the third image 60, it is easy to compare the feeding action of this cycle. Furthermore, multiple areas 51-53 can also be displayed in sequence from the side of the first image 40. Since they are displayed with arcs of different radii, it is easy to identify multiple areas 51-53. Furthermore, in order to facilitate identification, multiple areas 51-53 can also be displayed in different colors or shades. Using the display device 20 involved in modification example 2, the above-mentioned stamping processing monitoring method can be performed.

[0081] 5. Modification 3

[0082] use Figure 7 A display device 20a according to Modification 3 will be described. Figure 72 is a block diagram of a display device 20a of a press machine 1 according to Modification 3. The functions of the various components of the display device 20a according to Modification 3 are similar to those of Figure 2 The various components of the display device 20 shown are substantially the same, and therefore repeated descriptions are omitted.

[0083] like Figure 7 As shown, 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. The frames surrounding the display unit 21a and the control unit 21b may also be a frame. The display unit 21a is electrically connected to the control unit 21b, and can transmit and receive electrical signals with the control unit 21b.

[0084] The display unit 21a includes a display unit 22 and an operation unit 24. The display unit 21a may be, for example, a liquid crystal screen including a touch panel, or may be a tablet terminal including a touch panel.

[0085] The control unit 21b can be configured separately from the display unit 21a, or can be configured adjacent to the display unit 21a. Since the control unit 21b can be configured independently of the display unit 21a, the freedom of configuration of each unit is excellent. The control unit 21b includes a computing unit 26 and a storage unit 28. The control unit 21b can transmit and receive electric signals with the press machine 1, and can receive electric signals from the first sensor 76, the second sensor 77, and the third sensor 78.

[0086] The present invention is not limited to the above-mentioned embodiments, and various modifications may be made, including structures that are substantially the same as the structures described in the embodiments (structures with the same functions, methods and results, or structures with the same purposes and effects). In addition, the present invention includes structures that replace non-essential parts of the structures described in the embodiments. In addition, the present invention includes structures that can have the same effects as the structures described in the embodiments or structures that can achieve the same purposes. Furthermore, the present invention includes structures that add known technologies to the structures described in the embodiments.

[0087] Description of Reference Numerals

[0088] 1. Press, 2. Pad, 3. Slider, 4. Eccentric mechanism, 5. Crankshaft, 6. Connecting rod, 7. Motor, 8. Speed ​​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 unit, 24. Operation unit, 26. Calculation unit, 28. Storage unit, 31. First image group, 32. Second image group, 33. Third image group, 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. Unwinder, 72. Feeding device, 74. Processed material, 75. Product, 76. First sensor, 77. Second sensor, 78. Third sensor.

Claims

1. A display device for a press machine, comprising: a computing unit for generating a plurality of images; and a display unit for displaying the plurality of images; characterized in that: The plurality of images include: The first image is a ring or arc shape, which represents a stroke of the current slider action; a second image representing an input range of a sensor signal corresponding to an operation of an auxiliary device linked to the press machine; and A third image showing a range for monitoring the sensor signal; The second image and the third image are arc-shaped or sector-shaped images that are concentric with the first image; The second image is displayed on the display unit for a predetermined time after the sensor signal stops.

2. The display device for a press machine according to claim 1, characterized in that: The first image, the second image and the third image are an image group; The display unit displays a plurality of image groups simultaneously; The auxiliary device is a feeding device that sequentially feeds materials to the press; The second images in the plurality of image groups respectively represent different input ranges of sensor signals corresponding to operations of the feeding device.

3. The display device for a press machine according to claim 2, characterized in that: One of the different sensor signals is a signal output by a misfeed detector confirming that the material is delivered to a specified position by the feed device; Another of the different sensor signals is a signal from a product ejection detector which confirms that a product punched by the press has been ejected.

4. The display device of the press machine according to claim 2, characterized in that: One of the different sensor signals is a signal output by a misfeed detector confirming that the feed device has delivered the material to a specified position; Another of the different sensor signals is a signal from a scrap detector that confirms that scrap generated during a press process using the press has been discharged.

5. The display device for a press machine according to any one of claims 1 to 4, characterized in that: The display device further includes a storage unit that stores the input range of the sensor signal for each stamping process; The calculation unit totals the input ranges stored in the storage unit, and divides the second image into a plurality of regions according to the number of generated input ranges; The display unit displays the second image divided into the plurality of regions.

6. The display device of the press machine according to claim 1, characterized in that: The upper end of the first image corresponds to the top dead center of the eccentric mechanism of the press; The lower end of the first image corresponds to a bottom dead center of the eccentric mechanism of the press machine.

7. The display device of the press machine according to claim 1, characterized in that: The second image is displayed at a position sandwiched between the first image and the third image.

8. A method for monitoring a stamping process, characterized in that: The slide is lifted and lowered to perform a stamping process, and an auxiliary device is operated in conjunction with the stamping process; Displaying on the display unit: a first image in a circular or arc shape indicating one stroke of the current slider movement; a second image indicating an input range of the sensor signal corresponding to the movement of the attachment; and a third image indicating a range for monitoring the sensor signal; The second image and the third image are arc-shaped or sector-shaped images that are concentric with the first image; The second image is displayed on the display unit for a predetermined time after the sensor signal stops.

Images