Punching system and control method of punching system

Abstract

Provided is a press system and a control method for the press system, which automatically sets a timing for causing a press device to operate in conjunction with a feeding device. The straightening feeder has a feeding roller that feeds a coil in a closed state in which the coil is clamped and becomes an open state in which the coil is opened if processing using the press device is started. The press device has a sensor that detects a load F during processing, a positioning pin that is inserted into a hole provided in the coil and performs positioning during processing, and a controller that controls the straightening feeder to perform processing in conjunction with the press device. The controller calculates a timing Tos, i.e., a position Ps+L, at which the feeding roller is switched from the closed state to the open state based on a detection result of the sensor and a length L of the positioning pin.

Description

Technical Field

[0001] The invention relates to a stamping system and a control method of the stamping system. Background Art

[0002] In the past, there was a stamping device that performs sequential feed stamping processing (hereinafter referred to as sequential feed processing). In sequential feed processing, multiple processing steps are provided in one mold, and multiple processing (multiple processes) are performed. Coils are supplied from a winder provided on the upstream side of the processing to the stamping device that performs sequential feed processing. A straightening feeder that corrects the coil marks of the coil and conveys the coil is provided between the winder and the stamping device. In such a stamping system, it is necessary to control the conveyance of the coil in accordance with the processing action of the stamping device (in other words, the up and down action of the slide) (for example, refer to patent document 1).

[0003] The press is equipped with a rotary cam switch coupled to the rotation of the crankshaft. Processing is controlled based on signals output from the rotary cam switch in synchronization with the press's processing. The signals from the rotary cam switch are also used to control the various timings for the linked operations of the press and the straightening feeder. To ensure that the signals from the rotary cam switch are output at the desired timing, the timing of the signals output from the rotary cam switch and the press's processing are manually adjusted to match the die used in the press.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-075851 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] However, the timing of the output signal from the rotary cam switch (hereinafter referred to as output timing) is manually adjusted by, for example, inching the press. Manual adjustments are sometimes performed multiple times, which can be time-consuming. Furthermore, because the information obtained by adjusting the output timing of the signal from the rotary cam switch cannot be saved, such adjustments must be made each time the mold is changed. Therefore, from the perspective of automation, the background art has room for improvement.

[0009] The present invention has been made in view of the above-mentioned circumstances, and an exemplary object thereof is to provide a press system and a press system control method capable of automatically setting the timing for linking a press device and a feed device.

[0010] Solutions to Problems

[0011] In order to solve the above-mentioned problems, the present invention has the following gist.

[0012] (1) A stamping system comprising: a holding device for holding a coil; a stamping device for performing a sequential feed stamping process in which a plurality of processes are performed in a plurality of steps; and a feeding device for conveying the coil held by the holding device to the stamping device, wherein the feeding device has a roller for conveying the coil to the stamping device in a closed state of clamping the coil, and when the processing of the stamping device starts, the roller becomes an open state for opening the coil, and the stamping device has: a load detection unit for detecting the load during processing; a pin for being embedded in a hole opened in the coil for positioning during the processing; and a control unit for controlling the feeding device and the stamping device so as to perform the processing in conjunction with each other, and the control unit determines the timing for switching the roller from the closed state to the open state based on the detection result of the load detection unit and the length of the pin.

[0013] (2) A control method for a stamping system, wherein the stamping system comprises: a holding device that holds a coil; a stamping device that performs sequential feeding stamping processing in which multiple processes are performed in multiple steps; and a feeding device that conveys the coil held by the holding device to the stamping device, wherein the feeding device has a roller that conveys the coil to the stamping device in a closed state of clamping the coil, and when the processing of the stamping device starts, the roller becomes an open state of opening the coil, and the stamping device comprises: a load detection unit that detects the load during processing; a pin that is embedded in a hole opened in the coil to perform positioning during the processing; and a control unit that controls the feeding device and the stamping device in such a manner that the processing is performed in conjunction, wherein the control method for the stamping system comprises the following steps: the control unit calculates the timing of switching the roller from the closed state to the open state based on the detection result of the load detection unit and the length of the pin.

[0014] Further objects and other features of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings.

[0015] Effects of the Invention

[0016] According to the present invention, it is possible to provide a press system and a method for controlling the press system that can automatically set the timing for interlocking a press device and a feed device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic front view showing the structure of the press system according to the embodiment.

[0018] Figure 2 It is a schematic perspective view showing the structure of a press device according to an embodiment.

[0019] Figure 3 It is a schematic front view showing the structure of a die for performing the sequential feed stamping process according to the embodiment.

[0020] Figure 4 It is a block diagram of a punching device and a straightening feeder according to an embodiment.

[0021] Figure 5 (a) is a graph showing the feeding of the straightening feeder according to the embodiment, (b) is a graph showing the load and the position of the slide, and (c) is a graph showing the relationship between the rotation of the crankshaft and the control operation.

[0022] Figure 6 (a) is a diagram illustrating various values ​​when determining the interference timing setting value according to the embodiment, and (b) is a graph showing the relationship between time and feed speed during emergency stop processing.

[0023] Figure 7 (a) is a diagram showing information displayed after each timing is calculated according to the embodiment, and (b) is a diagram showing information after each calculated timing is set in the position switch. DETAILED DESCRIPTION

[0024] [Implementation Method]

[0025] (Stamping system)

[0026] Figure 1 This is a schematic front view showing the structure of the punching system of this embodiment. Figure 1 The conveying direction and upstream and downstream directions are also shown in FIG. The press system of this embodiment includes a winder 100, a straightening feeder 200, and a press device 300. The winder 100 and the straightening feeder 200 operate in conjunction with the processing operation of the press device 300.

[0027] (Winding Machine)

[0028] The winding machine 100, which serves as a holding device for holding a coil, includes a mandrel 110, a control unit 130, and a drive unit 140. A coil 120, which is an object to be processed by a punching device 300, is held on the mandrel 110. For example, the inner diameter of the coil 120 wound into a coil shape is held by the mandrel 110. The control unit 130 rotates the mandrel 110 via the drive unit 140 in conjunction with the processing operation of the punching device 300, thereby winding the coil 120.

[0029] (Straightening Feeder)

[0030] The straightening feeder 200 is a feeding device that conveys the coil 120 held by the winder 100 to the press device 300. The straightening feeder 200 includes a plurality of work rollers 210, a feed roller 220, a control unit 230, a storage unit 235, cylinders 240 and 250, and motors 260 and 270. The work rollers 210 are positioned upstream of the feed rollers 220 in the conveyance direction of the coil 120. They straighten the coil 120 when closed and unwind when opened. The work rollers 210 function as a straightening unit that gradually straightens the coil 120, such as winding marks, by gripping and conveying the coil 120 wound by the winder 100, moving from upstream to downstream in the conveyance direction of the coil 120. The feed rollers 220 (rollers) function as a feed unit that delivers the coil 120 straightened by the work rollers 210 to the press device 300. The feed rollers 220 convey the coil 120 to the press device 300 in a closed state, clamping the coil 120. When processing using the press device 300 begins, the feed rollers 220 enter an open state, opening the coil 120.

[0031] The cylinder 240 switches the feed roller 220 between a closed state, in which it clamps the coil 120, and an open state, in which it does not clamp the coil 120. The cylinder 250 switches the work rolls 210 between a state in which they clamp the coil 120 to correct the coil mark, and a state in which they do not clamp the coil 120. Similar to the feed rollers 220, the work rolls 210 are referred to as the closed state, and the state in which they do not clamp the coil 120 is referred to as the open state. It should be noted that, hereinafter, switching the feed roller 220 from the closed state to the open state, and maintaining the open state, by the cylinder 240 is referred to as release. Furthermore, switching the work rolls 210 from the closed state to the open state, and maintaining the open state, by the cylinder 250 is also referred to as release. The motor 260 drives the rotation of the feed roller 220. The motor 270 drives the rotation of the work rolls 210.

[0032] The control unit 230 corrects the winding marks of the coil 120 by controlling the cylinder 250 and motor 270 in conjunction with the operation of the winding machine 100. The control unit 230 controls the cylinder 240 and motor 260, as well as the cylinder 250 and motor 270, in conjunction with the operation of the punching device 300, thereby feeding the coil 120 to the punching device 300. It should be noted that the control unit 230 controls the rotation of the work rolls 210 and the feed rolls 220 using a known method, for example, using a detection mechanism such as an encoder. Similarly, the control unit 230 also controls the switching between the open and closed states of the work rolls 210 and the feed rolls 220 using a known method.

[0033] In the present embodiment, the work rolls 210 are driven by the motor 270 and the feed rolls 220 are driven by the motor 260, but the present invention is not limited thereto. For example, the work rolls 210 and the feed rolls 220 may be driven by a single motor.

[0034] The control unit 230 controls the straightening feeder 200 while being linked to the punching device 300 according to various programs stored in the storage unit 235. The storage unit 235 stores, for example, a speed for conveying the coil 120 (hereinafter referred to as the standard feed speed) and a high-speed feed speed that is faster than the standard feed speed. The control unit 230 conveys the coil 120 at the standard feed speed or the high-speed feed speed in accordance with the processing speed of the punching device 300.

[0035] In addition, in the present embodiment, the coil 120 is conveyed at a standard feed speed or a high-speed feed speed according to the processing speed of the punching device 300, but is not limited to this. For example, a mode of conveying the coil 120 at a high-speed feed speed can sometimes be selected in the case of a material with a maximum specification lower than the correction capacity of the working roller 210. In this case, the time (feed time) for conveying the coil 120 to the feed length is shortened, so the rotation speed in the punching device 300 can be increased. Therefore, the controller 314 can also change the processing speed of the punching device 300 side according to the feed speed of the straightening feeder 200 side. In addition, more than three feed speeds can also be stored in the storage unit 235. The control unit 230 stops the conveying action (feeding completion) after conveying the coil 120 to the length of the workpiece described later.

[0036] It should be noted that the straightening feeder 200 may also have a display unit and an input unit. Figure 1 In the description, a straightening feeder 200 is described which includes a straightening machine for correcting the curling marks of a coil and a feeder for conveying the coil having the curling marks corrected by the straightening machine to a punching device. However, these devices may be independently provided in the punching system.

[0037] (Pressing device)

[0038] use Figure 2 right Figure 1 The punching device 300 is described below. Figure 2 This is a schematic three-dimensional diagram showing the structure of the punching device 300 of this embodiment, for example, a schematic diagram of the punching device 300 of an integrated linear side frame type or a C-frame type. In addition, for example, the punching device 300 is a device that performs sequential feed punching processing in which multiple processes are performed in multiple steps. Figure 2The conveying direction of the coil 120, the upstream, downstream, up and down directions, and the front and back directions (front and back) in the conveying direction are shown. The stamping device 300 is constructed to have a drive motor 304 (drive unit), a transmission mechanism 306, a crankshaft 308, a connecting rod 310, a slide 312, and a pad 322 inside and outside the shell 302. In addition, the stamping device 300 has a controller 314 as a control unit, a storage unit 315, a display unit 316, and an input unit 318. In addition, the stamping device 300 includes a sensor 324, a rotary encoder 325, and a slug 326. The stamping device 300 of this embodiment is a sequential feed type stamping device that performs sequential feed stamping processing (hereinafter referred to as sequential feed processing), and has multiple processing steps.

[0039] The drive motor 304 is, for example, a servo-controlled servo motor, and while controlling the amount and direction of rotation, it moves the mold 303 (described later) up and down via a transmission mechanism 306, a crankshaft 308, and a connecting rod 310. The transmission mechanism 306 is configured to include transmission components such as gears and belts, and transmits the rotation of the motor shaft of the drive motor 304 to the crankshaft 308. A control signal to the drive motor 304 is sent from a controller 314.

[0040] Crankshaft 308 and connecting rod 310 are used to convert the rotational movement of the motor shaft transmitted by transmission mechanism 306 into reciprocating movement (in this embodiment, vertical movement). Crankshaft 308 rotates due to the rotation of the motor shaft, and this rotation is transmitted to connecting rod 310 connected to crankshaft 308 near one end, causing connecting rod 310 to move vertically (lift and lower).

[0041] In addition, a rotary cam switch (not shown) is provided on the crankshaft 308, which outputs an on signal or an off signal in conjunction with the rotation of the crankshaft 308. The rotary cam switch outputs an on signal or an off signal, for example, when the rotation of the crankshaft 308 reaches a predetermined angle, in other words, when it reaches a predetermined timing in the processing operation. Hereinafter, the timing at which the rotary cam switch outputs an on signal (or an off signal) is referred to as the output timing. Based on the signal output from the rotary cam switch, the controller 314 performs the processing operation in conjunction with the winder 100 and the straightening feeder 200. In the past, the output timing of the signal of the rotary cam switch needed to be manually adjusted (or set) in advance for each mold.

[0042] A slider 312 is connected near the other end of the connecting rod 310. As the connecting rod 310 moves up and down, the slider 312 moves up and down along the fillet 326. In the punching device 300, a backing plate 322 is arranged so as to face the slider 312. An upper die 303a, which is part of the mold 303, is attached to the surface of the slider 312 that faces the backing plate 322 (the lower surface in this embodiment). A lower die 303b, which forms a pair with the upper die 303a, is attached to the surface of the backing plate 322 that faces the slider 312 (the upper surface in this embodiment).

[0043] The coil 120 as the object to be processed is placed between the upper die 303a and the lower die 303b, and the coil 120 is pressed by the upper die 303a and the lower die 303b, thereby being pressed by the punching device 300. Figure 2 The coil 120 is conveyed from the left (upstream) side to the right (downstream) side, and the conveying direction of the coil 120 is hereinafter referred to as the left-right direction. In a stamping process having multiple steps, the initial processing is performed upstream in the conveying direction of the coil 120, and the final processing is performed downstream in the conveying direction of the coil 120.

[0044] In detail, the drive motor 304 is controlled by the controller 314 to rotate. The rotation of the drive motor 304 is transmitted to the connecting rod 310 via the transmission mechanism 306 and the crankshaft 308, and the slider 312 moves up and down. By moving the slider 312 downward, the upper mold 303a and the lower mold 303b are pressed, and the coil 120 is stamped. That is, in the stamping device 300, the drive motor 304, the transmission mechanism 306, the crankshaft 308, the connecting rod 310, and the slider 312 constitute a stamping part. A rotation speed detection unit, namely a rotary encoder 325, is provided in the transmission mechanism 306 for detecting the rotation speed of the crankshaft 308. The controller 314 can detect the position of the slider 312 by detecting the rotation speed of the crankshaft using the rotary encoder 325.

[0045] The sensor 324, which is a load detection unit for detecting the load during processing, is used to detect the load F (see FIG. 1 ) acting on the link 310 when the press device 300 performs press processing on the coil 120. Figure 5 ) sensor, for example, a force sensor. The sensor 324 may also be a strain gauge provided on the housing 302. The sensor 324 may also be provided at any position of the connecting rod 310 (for example, near the center). Furthermore, a plurality of sensors 324 may be provided, for example, the deformation of the left and right sides of the housing 302 may be detected separately, and the detected results may be added together as the total load F. In addition, Figure 2 In the figure, the side where the display unit 316 is arranged is the front side of the punching device 300.

[0046] The controller 314 controls the punching device 300 according to various programs stored in the storage unit 315. The display unit 316 displays data indicating the status of the punching device 300. The input unit 318 is used to input data required for operating the punching device 300. The input unit 318 is used when the user inputs the length of the positioning pin, the feed timing setting value, the interference timing setting value, the length of the conveying coil 120 (hereinafter also referred to as the workpiece length, the feed length), etc. described later. In addition, the workpiece length is, for example, the length in the conveying direction of the processing step. The controller 314 controls so that the straightening feeder 200 is processed in conjunction with the punching device 300. In the punching device 300 that performs sequential feeding processing, the controller 314 controls in the following manner: when the processing on one processing step is completed, the straightening feeder 200 is used to convey the coil 120 to the next processing step at a predetermined feed speed for a predetermined feed length.

[0047] (Mold)

[0048] Figure 3 It is a schematic front view showing the structure of the mold for performing the sequential feed stamping process of this embodiment, and in particular, it is a schematic diagram illustrating the mold 303 (upper mold 303a, lower mold 303b) possessed by the stamping device 300 of this embodiment. The stamping device 300 of this embodiment uses one mold 303 to perform various multiple processes (multiple processes) such as stamping, precision pressing, trimming, thinning, and hole opening. The part (range) in the mold 303 where one process is performed is called a processing step. Figure 3 In the die 303 shown, for example, four processing steps St1, St2, St3, and St4 are provided from the upstream side in the conveying direction.

[0049] In processing step St1, a punch 350 is provided on the upper die 303a. A die 360 ​​is provided on the lower die 303b at a position opposite the punch 350. During processing step St1, the punch 350 and the die 360 ​​create positioning holes 122 in a portion of the coil 120 that will become waste (hereinafter referred to as the waste portion). The positioning holes 122 are holes into which positioning pins 352 are inserted to position the die 303 and the coil 120 during processing.

[0050] In the processing steps St2 to St4, a positioning pin 352 is provided on the upper mold 303a. A punch 362 is provided on the lower mold 303b at a position opposite to the positioning pin 352. The positioning pin 352 (pin) is inserted into the positioning hole 122 (hole) provided in the coil 120 during the processing steps St2 to St4, thereby positioning the mold 303 and the coil 120 during the processing. Figure 3The length of the positioning pins 352 (three in the figure) is, for example, the same length L. The length L of the positioning pins 352 varies for each mold 303. It should be noted that the length L of the positioning pins 352 is the length from the lower surface of the upper mold 303a to the front end of the positioning pins 352.

[0051] (Block diagram of stamping system)

[0052] Figure 4 This is a block diagram of the stamping system of this embodiment, specifically showing a block diagram of the straightening feeder 200 and the stamping device 300. The control unit 230 of the straightening feeder 200 controls the motor 260 to rotate the feed roller 220. In addition, the control unit 230 controls the cylinder 240 to switch the feed roller 220 between an open state and a closed state. The control unit 230 controls the motor 270 to rotate the work roller 210. In addition, the control unit 230 controls the cylinder 250 to control the work roller 210's straightening action on the coil 120 and switching between an open state and a closed state. The storage unit 235 stores various information, programs, etc. required for the control unit 230 to control the straightening feeder 200.

[0053] The controller 314 of the punching device 300 controls the drive motor 304. The controller 314 is also connected to the display unit 316 and the input unit 318. The controller 314 reads out various parameters, various programs, etc. pre-stored in the storage unit 315, and controls the processing action of the punching device 300 based on these parameters, various programs, etc. In addition, the setting information of the timing described later is stored in the storage unit 315. The rotary encoder 325 detects the rotation speed of the output shaft (not shown) of the drive motor 304, and outputs the detection result to the controller 314. The controller 314 controls the drive motor 304 based on the detection result of the rotary encoder 325. In addition, the controller 314 detects the load F generated during processing through the sensor 324.

[0054] The controller 314 of the punching device 300 and the control unit 230 of the straightening feeder 200 can mutually transmit and receive various information using a known communication method, for example, via a communication port (not shown) provided in each device.

[0055] (Timing required for linkage between the punching device and the straightening feeder)

[0056] In order for the punching device 300 to perform processing operations in conjunction with the straightening feeder 200, it is necessary to control the timing of the processing operations. The control unit 230 of the straightening feeder 200 needs to convey the coil 120 to the next processing step at a time when the coil 120 and the die 303 of the punching device 300, particularly the positioning pin 352 protruding downward from the upper die 303a, do not interfere with each other. In addition, the control unit 230 needs to release the work roll 210 and the feed roll 220 at the time when the positioning pin 352 is inserted into the positioning hole 122. In this embodiment, it is characterized in that the controller 314 determines the timing for switching the feed roll 220 from the closed state to the open state based on the detection result of the sensor 324 and the length L of the positioning pin 352.

[0057] By releasing the work rolls 210 and the feed rolls 220, the coil 120 becomes free, and when the positioning pins 352 engage the positioning holes 122, the position and orientation of the coil 120 relative to the mold 303 can be corrected. Hereinafter, the command sent by the controller 314 to the control unit 230 to release the work rolls 210 and the feed rolls 220 is referred to as a release command. In this embodiment, the release of the feed roll 220 is described.

[0058] The range from the start of release (switching from the closed state to the open state) to the end of release (switching from the open state to the closed state) is determined based on the position (height) and the bottom dead center of the slider 312 at which the positioning pin 352 begins to fit into the positioning hole 122. In addition, when the punching device 300 has a punching template (not shown), the end of release is determined based on the position where the punching template is separated from the coil 120. It should be noted that in the past, in order to set the timing of releasing the feed roller 220 (hereinafter referred to as the release timing), the punching device 300 was manually adjusted by micro-moving in advance.

[0059] In addition, hereinafter, when the processing by the punching device 300 is completed and the coil 120 is conveyed to the next processing step by the straightening feeder 200, the instruction sent by the controller 314 to the control unit 230 in a manner to convey the coil 120 is referred to as a feed instruction. The timing of sending the feed instruction (hereinafter referred to as the feed timing) is set based on the height (position) of the slider 312 as follows: after the processing by the punching device 300 is completed, the feed roller 220 is closed, the slider 312 (i.e., the die 303, in particular, the positioning pin 352) rises, and the coil 120 can be conveyed without interfering with the coil 120. For example, the feed timing is set based on the height of the slider 312 when the positioning pin 352 is completely withdrawn from the positioning hole 122 opened in the coil 120 after the processing is completed.

[0060] Furthermore, even while the coil 120 is being conveyed by the straightening feeder 200, the slide 312 on the stamping device 300 continues its downward movement, transitioning from ascending to descending in preparation for the next process. Therefore, for example, it is necessary to complete the conveyance of the coil 120 by the straightening feeder 200 before the portion of the coil 120 that has been processed in process step St1 is conveyed to the next process step St2 and the positioning pins 352 begin to engage the positioning holes 122. To prevent interference between the conveyance of the coil 120 and the slide 312, specifically the positioning pins 352, during this period, the controller 314 outputs a signal to the control unit 230. This signal is hereinafter referred to as the interference signal. The timing at which the controller 314 outputs the interference signal to the control unit 230 (hereinafter referred to as the interference timing) requires that the slide 312 be positioned higher than the length L of the positioning pins 352, relative to the position of the slide 312 at the start of processing (equivalent to timing Ts, described below). The interference timing is based on the position of the slider 312 at the start of processing, but the present invention is not limited thereto. For example, the position of the slider 312 at the release timing (equivalent to timing Tos described later) may be used as a reference.

[0061] Here, if the position of the slider 312 corresponding to the interference timing becomes higher, the range in which the coil 120 can be conveyed (hereinafter referred to as the feedable range) becomes smaller. In this case, in order to expand the feedable range, it is necessary to reduce the rotation speed of the crankshaft 308 of the punching device 300. Thus, it is necessary to control the processing action on the punching device 300 side (for example, the rotation speed of the crankshaft 308, etc.) in accordance with the timing of the conveyance of the coil 120.

[0062] (Method for Setting Each Timing in the Present Embodiment)

[0063] To set each timing, a press machine 300 equipped with a predetermined die 303 performs a processing operation once. The controller 314 detects the load F during the processing operation using the sensor 324. The controller 314 determines that processing has started when the sensor 324 starts detecting the load F, and determines that processing has ended when the sensor 324 stops detecting the load F. Figure 5 (a) is a graph showing the feeding of the straightening feeder 200 of this embodiment, and (b) is a graph showing the load F and the position of the slider 312. Figure 5 In (b), the dashed line indicates the load F [×10 kN] detected by sensor 324 during machining, and the solid line indicates the position of slider 312 (mm) based on the detection result by rotary encoder 325. The position of slider 312 is based on the bottom dead center (0 mm). The horizontal axis represents time.

[0064] During one machining operation, the controller 314 stores the load F and the time (timing) detected by the sensor 324 in the storage unit 315. Furthermore, during one machining operation, the controller 314 stores the position (height) and the time (timing) of the slider 312 in the storage unit 315 based on the results detected by the rotary encoder 325.

[0065] The controller 314 can determine at which time (or position) the mold 303 starts processing and at which time (or position) the mold 303 ends processing by analyzing the waveform of the load F obtained through one processing (hereinafter referred to as the load waveform). Figure 5 In the load waveform, controller 314 determines the machining start time Ts from the rise of the load waveform, and determines the machining end time Te from the moment the load waveform reaches 0 [×10 kN]. This shows that the range from time Ts to time Te is the range where the load due to machining (machining load) is applied.

[0066] (Release Timing)

[0067] The controller 314 determines the position Ps of the slider 312 at the timing Ts. At the start of processing, the positioning pin 352 is inserted into the positioning hole 122. The timing for starting the release of the feed roller 220 (hereinafter referred to as the start timing) must be before the positioning pin 352 begins to insert into the positioning hole 122, preferably immediately before the positioning pin 352 begins to insert into the positioning hole 122.

[0068] In other words, the start timing of releasing the feed roller 220 can be set to timing Tos, that is, when the slider 312 is at a position higher than the position Ps by the length L of the positioning pin 352 (Ps + L). The controller 314 sets the start timing of releasing the feed roller 220 to timing Tos (=Ts - ΔT), which is obtained by subtracting the time corresponding to the length L of the positioning pin 352 (hereinafter referred to as ΔT) from the timing Ts.

[0069] Release start timing Tos = timing Ts - ΔT

[0070] The controller 314 sets the timing at which the release of the feed roller 220 is completed (hereinafter referred to as the end timing) Toe as the timing Te.

[0071] Release end timing Toe = timing Te

[0072] Furthermore, at timing Te, the slider 312 is at position Pe. Based on the above, the range of the release command is from timing Tos to timing Toe. The controller 314 of the punching device 300 sends a release command to the control unit 230 of the straightening feeder 200, causing the feed roller 220 to be released (maintained in the open state) from timing Tos to timing Toe. The range from timing Tos to timing Toe constitutes the release range of the feed roller 220.

[0073] In addition, if Figure 5 As shown in (b), since the timing can be converted to the position of the slider 312, in actual control, the position of the slider 312 is set to a set value. For example, the position Ps of the slider 312 at the start time Ts of processing is set to 20 mm, the position Pe of the slider 312 at the end time Te of processing is set to 20 mm, and the length L of the positioning pin 352 is set to 10 mm. Thus, the position of the slider 312 at the start time of release is 30 mm (= 20 mm + 10 mm) and at the end time of release is 20 mm. In this way, the controller 314 sets the first timing for opening the feed roller 220 from the closed state before processing to the time when the height of the slider 312 when it descends reaches the height obtained by adding the length L of the positioning pin 352 to the height at the start of processing. Furthermore, the controller 314 sets the timing for closing the feed roller 220 from the open state after processing to the time when the height of the slider 312 when it ascends reaches the height at the end of processing.

[0074] (Feeding Timing)

[0075] At the end of processing at time Te, the slider 312 is at position Pe, and the positioning pin 352 has not been removed from the positioning hole 122, so the coil 120 cannot be fed. The positioning pin 352 disengages from the positioning hole 122 at time Tp, when the slider 312 is at a position higher than position Pe by the length L of the positioning pin 352 (Pe + L). After this time Tp, the straightening feeder 200 can feed the coil 120 to the next processing step. Here, the feed command start time is Tts, and the position of the slider 312 at this time is Pts.

[0076] In the present embodiment, the controller 314 adds a predetermined setting value (hereinafter referred to as a feed timing setting value) to the release end timing Toe in consideration of a margin (margin) so that the timing Tts becomes later than the timing Tp.

[0077] Feed start timing Tts = timing Toe + feed timing setting value

[0078] Similar to the timing of each release, in order to control the position of the slider 312, the feed timing setting value (first value) is set to, for example, 20 mm. Thus, the position Pts of the slider 312 at the start timing Tts of feeding becomes 40 mm (= 20 mm + 20 mm). As described above, the controller 314 sets the timing of starting the conveyance of the coil 120 via the feed roller 220 after the processing is completed to a later time than the timing of setting the feed roller 220 from the open state to the closed state. Furthermore, the controller 314 sets the timing of starting the conveyance of the coil 120 via the feed roller 220 after the processing is completed to the timing equal to the position of the slider 312 at the time of the completion of the processing plus the first value.

[0079] like Figure 5 As shown in (a), the conveyance of the coil 120 by the feed roller 220 starts at timing Tts, and when the coil 120 is conveyed by a preset feed length, the conveyance of the coil 120 by the feed roller 220 is stopped.

[0080] (Interference Timing)

[0081] In a predetermined processing step, the conveyance of the coil 120 by the straightening feeder 200 must be completed before the timing Tem that is earlier than the start timing Tos of the release. In a case where the conveyance of the coil 120 based on the straightening feeder 200 is not completed before the timing Tem, the coil 120 and the mold 303 may interfere with each other and cause adverse conditions. In a case where the conveyance of the coil 120 is not completed before the timing Tem, the controller 314 outputs a signal (hereinafter referred to as an emergency stop signal) in order to stop the stamping system safely. Here, stopping the stamping system safely means, for example, stopping in a state where the positioning pin 352 is not in contact with the coil 120. The timing Tem at which the controller 314 outputs the emergency stop signal is set taking into account the surplus time that the stamping device 300 can actually stop safely from the output of the signal.

[0082] Hereinafter, the timing Tem is referred to as the interference timing. The interference timing Tem is set to a timing at which the stamping system can be safely stopped, that is, a timing earlier than the timing Tos. For example, the controller 314 sets the interference timing to a value obtained by subtracting a predetermined set value (hereinafter referred to as the interference timing set value) from the timing Ts at the start of processing, taking into account the margin (margin).

[0083] Interference timing Tem = timing Ts - interference timing setting value

[0084] Similar to the release timing, the interference timing setting value (second value) is set to, for example, 40 mm to control the position of the slider 312. Thus, the position of the slider 312 at the interference timing is 60 mm (= 20 mm + 40 mm). In the above, the controller 314 outputs a signal when there is a possibility of interference between the positioning pin 352 and the web 120, while the feed roller 220 has not yet completed conveying the web 120. The controller 314 sets the timing of the output signal to the position of the slider 312 at the first timing plus the second value.

[0085] As mentioned above, when setting the interference timing, there are two cases where the timing Tos (position Ps+L of slider 312) is used as a reference, and when the timing Ts (position Ps of slider 312) is used as a reference. When the timing Tos (position Ps+L of slider 312) is used as a reference, the interference timing setting value does not include the length L of positioning pin 352. On the other hand, when the timing Ts (position Ps of slider 312) is used as a reference, the interference timing setting value includes the length L of positioning pin 352.

[0086] (Interference timing setting value (second value))

[0087] Here, the interference timing setting value is explained. In the case of setting the interference timing to prevent interference, the "interference" mentioned here can be considered to be two types: the case of interference between the mold 3 and the coil 120 at the position where the processing starts and the case of interference between the positioning pin 352 and the coil 120. In the case of having a positioning pin 352 as in the present embodiment, the position or timing (=Tos) of the slider 312 when the interference between the positioning pin 352 and the coil 120 starts is set as the position (hereinafter referred to as the interference position) or the timing of starting interference. On the other hand, in the case of a mold without a positioning pin or when the length of the positioning pin 352 is unknown, the position or timing (=Ts) of the slider 312 at the start of processing is set as the interference position or the timing of starting interference.

[0088] use Figure 6 A method of considering the deceleration movement angle as the interference timing setting value, which is applied to either of the two interference timings (Ts, Tos), will be described. Figure 6 (a) is a diagram explaining various values ​​when determining the interference timing setting value (ie, the deceleration movement angle), and (b) is a graph showing the relationship between time and feed speed during the sudden stop process.

[0089] like Figure 6 As shown in (a), in the following description, the position of the slider 312 at time t (hereinafter referred to as the slider position) is set as P(t), and the feed speed v[min -1], the position (hereinafter referred to as the interference check position) for judging (checking) whether to stop the punching device 300 and the straightening feeder 200 in order to anticipate interference is set to P(v). In addition, the moving distance from the output of the emergency stop signal from the controller 314 to the punching device 300 and the straightening feeder 200 to the deceleration and stop of the processing action of the punching device 300 and the feeding action of the straightening feeder 200, in other words, the moving angle is set to the deceleration moving angle P(x)[deg]. Wherein x represents the deceleration moving angle, which is a variable related to the current speed and deceleration time. In addition, the deceleration time relative to the feed speed v is set to T(v)[ms]. In addition, the deceleration time T(v) is different for each punching device 300. And, the interference position is set to P1.

[0090] The controller 314 constantly monitors the slide position P(t). Before the slide position P(t) passes the interference check position P(v), if it determines that the feeding of the coil 120 by the straightening feeder 200 is not complete, it outputs an emergency stop signal to the punching device 300 and the straightening feeder 200 as an error, causing them to stop urgently. The position of the interference check position P(v) above the interference position P1 corresponds to the deceleration movement angle P(x) calculated by the following formula.

[0091] P(x)=v÷60×360÷1000×T(v)÷2

[0092] =(3×v×T(v))÷1000

[0093] Figure 6 (b) shows a specific example of the feed speed v and deceleration time T(v) during the emergency stop process. For example, when the feed speed v is 60 [min -1 ], when the deceleration time T(v) is 120[ms], the deceleration movement angle P(x) becomes the following value.

[0094] P(x)=60÷60×360÷1000×120÷2=21.6°

[0095] When the interference position P1 is 160°, the interference check position P(v) is:

[0096] P(v)=P1-P(x)

[0097] Therefore, when the deceleration movement angle P(x) is 21.6°,

[0098] P(v)=160-21.6=138.4°.

[0099] In addition, for example, when the feed speed v is 30 [min -1], when the deceleration time T(v) is 60[ms], the deceleration movement angle P(x) becomes the following value.

[0100] P(x)=30÷60×360÷1000×60÷2=5.4°

[0101] When the interference position P1 is 160° and the deceleration movement angle P(x) is 5.4°, the interference check position P(v) is:

[0102] P(x)=160-5.4=154.6°.

[0103] like Figure 6 As shown in black or oblique lines in (b), the deceleration movement angle P(x) as the disturbance timing setting value is the area of ​​the triangle in the graph of time t and feed speed v.

[0104] Furthermore, although the second value has been described as the deceleration movement angle amount, when actually setting the second value, a value with a slight margin, such as 10 ms, may be used for safety reasons.

[0105] As described above, the controller 314 calculates the release start timing, the release end timing, the feed timing, and the interference timing as the position of the slider 312 at each timing. Figure 5 (c) is a diagram showing the relationship between the rotation of the crankshaft 308 and the control operation (release, feed, interference) of the straightening feeder 200 and the operation (processing (dashed line)) of the punching device 300, and also shows the top dead center and the bottom dead center.

[0106] (Automatic setting of timing and position switch)

[0107] Figure 7 (a) is a diagram showing information displayed on, for example, the display unit 316 after each timing according to the present embodiment described above is calculated, and (b) is a diagram showing information when each calculated timing is set in the position switch. Figure 7 (a) shows the result of the controller 314 finding the start and end of processing based on the load waveform obtained from the detection result of the sensor 324 during one punching process, and automatically setting the timings found from the timing of the start and end of processing as the position of the slider 312. In addition, Figure 7 In (a), "Down" and "Up" indicate the up and down movement of slider 312, and "PS6" and the like indicate position switches. Controller 314 displays this screen on display unit 316. If the values ​​calculated by controller 314 are sufficient, clicking the "Set" button will store them in, for example, storage unit 315.

[0108] Then, the controller 314 Figure 7The setting value of (a) is stored in the storage unit 315 as the setting value of the soft switch (hereinafter referred to as the position switch) in association with the program for controlling the mold 303 and the processing operation of the mold 303. Thus, the controller 314 can read the setting value stored in the storage unit 315 to perform various timing controls the next time the same mold 303 or the same program is used, eliminating the need for manual adjustment each time the mold 303 is replaced or the program is called. Figure 7 (b) shows an example in which the setting values ​​obtained by the automatic calculation of this embodiment for a predetermined mold X are set to the position switches "PS1" to "PS8".

[0109] For example, Figure 7 In (a), based on the result of the load waveform analysis by the controller 314, the position of the descending slider 312 is set to 30 mm from the reference position (e.g., 0 mm) as the start timing of release (ON), and the position of the ascending slider 312 is set to 20 mm from the reference position as the end timing of release (OFF). The setting value for release is stored in the position switch "PS6". For example, Figure 7 The data is stored as shown in "PS6" in (b). The same applies to feed (position switch "PS7") and interference (position switch "PS8").

[0110] As described above, this embodiment automatically configures various timing settings for coordinating the punching device 300 with the straightening feeder 200 for machining. This eliminates the need for repeated manual adjustments, reducing the number of manual inputs required. Furthermore, since the software position switches also reflect set values, the information stored in the memory unit can be retrieved and used from the second time the same mold or program is used.

[0111] In addition, when the punching system is operated at high speed, the time (feed time) for conveying the same distance becomes shorter than that at the standard feed speed, so the speed during the punching process increases. When the feed timing setting value and the interference timing setting value are set at the position of the slide 312, they become constant values ​​regardless of the feed speed, but it is also possible to use Figure 7 The screen shown in (a) further adjusts the calculated setting value.

[0112] In addition, in this embodiment, the timing of the start and end of the release of the feed roll 220 is described, but the timing of the start and end of the release of the work roll 210 can also be calculated. The time from the closed state to the open state of the work roll 210 is determined by the structure of the work roll 210 (see Figure 1), which is longer than the time it takes for the feed roller 220 to transition from the closed state to the open state. That is, the release takes longer in the work roll 210 than in the feed roll 220. Conventionally, the release command from the punching device 300 to the straightening feeder 200 was output simultaneously. However, using the timing calculation method of this embodiment, it is possible to distinguish between the release command to the feed roll 220 and the release command to the work roll 210. In this way, by outputting the release command to the feed roll 220 and the release command to the work roll 210 at different times, the time difference required for release can be absorbed, and the release time can be shortened as a whole. Moreover, if the release time can be shortened, the rotation speed of the stamping process in the punching device 300 can also be increased. As described above, the controller 314 can also calculate a second timing for the work roll 210 to transition from the closed state to the open state based on the detection result of the sensor 324 and the length L of the positioning pin 352, and this second timing is different from the first timing in the feed roll 220.

[0113] While preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the gist of the invention. For example, there are the following modifications.

[0114] In the above embodiment, the positioning hole 122 is formed in the waste portion of the coil 120 by the punch 350 in the processing step St1, but the present invention is not limited thereto. For example, the positioning pin 352 may be embedded in the hole processed as a product.

[0115] In addition, in the above embodiment, the positioning pins 352 are set to the same length, but they can also be set to different lengths according to the processing steps. In this case, for example, the start / end timing of the release can be determined based on the most stringent condition, that is, the length of the longest positioning pin among the multiple positioning pins.

[0116] Furthermore, in the above embodiment, the controller 314 of the punching device 300 calculates each timing, but this is not limiting. For example, the control unit 230 of the straightening feeder 200 may receive necessary information such as the length L of the positioning pin 352 from the controller 314 and calculate each timing. In this manner, the controller 314 and the control unit 230 may each handle all or part of the above control. The information required for the above control may be stored in either the storage unit 315 or the storage unit 235.

[0117] As described above, according to the present embodiment, it is possible to provide a press system and a press system control method that can automatically set the timing for linking the press device and the feed device.

[0118] Explanation of symbols

[0119] 100 - Winder, 110 - Mandrel, 116 - Display, 120 - Coil, 122 - Positioning Hole, 130 - Control, 140 - Drive, 200 - Straightening Feeder, 210 - Work Roll, 220 - Feed Roll, 230 - Control, 235 - Storage, 240, 250 - Cylinder, 260, 270 - Motor, 300 - Stamping Device, 302 - Housing, 303 - Die, 303a —Upper die, 303b—lower die, 304—driving motor, 306—transmission mechanism, 308—crankshaft, 310—connecting rod, 312—sliding member, 314—controller, 315—storage unit, 316—display unit, 318—input unit, 322—pad, 324—sensor, 325—rotary encoder, 326—insert strip, 350—punch, 352—locating pin, 360—die, 362—die.

Claims

1. A stamping system comprising: a holding device for holding a coil; a stamping device for performing a sequential feed stamping process in which a plurality of processes are performed in a plurality of steps; and a feeding device for conveying the coil held by the holding device to the stamping device. The stamping system is characterized by: The feeding device includes rollers that convey the coil toward the punching device in a closed state of clamping the coil, and when the punching device starts processing, the rollers are in an open state of opening the coil. The punching device has: A load detection unit, which detects the load during processing; A pin embedded in a hole formed in the coil for positioning during processing; and a control unit configured to control the feeding device and the punching device so as to perform the processing in conjunction with each other, The control unit controls the feeding device so as to switch the roller from the closed state to the open state at a timing based on the length of the pin before the load detection unit starts detecting the load.

2. The punching system according to claim 1, characterized in that The control unit determines that the machining is started when the load detection unit starts detecting the load, and determines that the machining is finished when the load detection unit stops detecting the load.

3. The punching system according to claim 2, characterized in that The punching device has: A mold, which processes the coil through an upper mold and a lower mold; and A sliding member, on which the upper mold is installed, moves up and down, The control unit sets the first timing for changing the roller from the closed state to the open state before starting the processing as the timing when the slider is lowered to a height obtained by adding the length of the pin to the height at the start of the processing.

4. The punching system according to claim 3, characterized in that The control unit sets the timing for changing the roller from the open state to the closed state as the timing when the height of the slider during the ascent reaches the height at which the processing is completed.

5. The punching system according to claim 4, characterized in that The control unit starts conveying the web by the roller after the processing is completed at a timing after the roller is changed from the open state to the closed state.

6. The punching system according to claim 5, characterized in that The control unit sets the timing of starting the conveyance of the coil by the roller after the processing is completed to the timing obtained by adding a first value serving as a margin to the position of the slider at the time of the processing completion.

7. The punching system according to claim 6, characterized in that The control unit outputs a signal when the pin and the coil may interfere with each other while the roller has not yet completed conveying the coil, and sets the timing of outputting the signal to the timing obtained by adding a second value as a margin to the position of the slider at the first timing.

8. The punching system according to claim 6, characterized in that The control unit outputs a signal when the pin and the coil may interfere with each other when the roller has not finished conveying the coil, and sets the timing of outputting the signal to the timing obtained by adding a second value including the length of the pin to the position of the sliding part at the time of starting the processing.

9. The punching system according to any one of claims 3 to 8, characterized in that: The feed device includes a work roller, which is arranged upstream of the roller in the conveying direction of the coil, and is closed to correct the coil, and opened to unwind the coil. The control unit determines a second timing for the work roll to change from the closed state to the open state at a timing different from the first timing based on the detection result of the load detection unit and the length of the pin.

10. A method for controlling a stamping system, the stamping system comprising: a holding device for holding a coil; a stamping device for performing a sequential feed stamping process in which a plurality of processes are performed in a plurality of steps; and a feeding device for conveying the coil held by the holding device to the stamping device, wherein the method for controlling the stamping system is characterized in that: The feeding device includes a roller that feeds the coil toward the punching device in a closed state of clamping the coil, and when the punching device starts processing, the roller is in an open state of opening the coil. The punching device has: A load detection unit, which detects the load during processing; A pin embedded in a hole formed in the coil for positioning during processing; and a control unit configured to control the feeding device and the punching device so as to perform the processing in conjunction with each other, The control method of the press system includes the step of controlling the feed device so that the control unit switches the roller from the closed state to the open state at a timing based on the length of the pin before the load detection unit starts detecting the load.

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