Progressive die press and control method
The progressive press device accurately adjusts punching position by using a recognition unit and controlling feed and movement based on contour lines or induced current, enhancing the precision and quality of rotor and stator cores.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2023-07-18
- Publication Date
- 2026-05-11
AI Technical Summary
Existing progressive press devices struggle to accurately adjust the punching position when it is deviated obliquely with respect to the feeding direction, leading to misalignment issues.
A progressive press device equipped with a conveying section, multiple presses, a printing section, and a recognition unit that prints outlines on the strip-shaped steel plate, allowing for precise adjustment of the punching position by controlling the feed amount and movement in the transport direction based on the recognized shape of the contour line or induced current.
The device can accurately adjust the punching position, ensuring high dimensional accuracy of rotor and stator cores, reducing air gaps, and improving torque performance.
Smart Images
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Abstract
Description
Technical Field
[0001] The present disclosure relates to a progressive press device and a control method.
Background Art
[0002] Motor cores such as rotor cores and stator cores are formed by laminating electromagnetic steel sheets. The electromagnetic steel sheets are, for example, punched by a press machine. In order to prevent the lamination of electromagnetic steel sheets with misaligned punching holes, the development of a technique for eliminating the deviation of the punching position has been carried out.
[0003] For example, Patent Document 1 discloses a progressive press device that eliminates the deviation of the punching position. In the progressive press device disclosed in Patent Document 1, load sensors are provided on four side surfaces of a pilot pin that serves as a reference for punching. In the progressive press device disclosed in Patent Document 1, the deviation of the punching position is eliminated based on the load results in the four directions of up, down, left, and right with respect to the feeding direction.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] In the progressive press device disclosed in Patent Document 1 described above, when it is deviated obliquely with respect to the feeding direction, it has been difficult to accurately adjust the deviation of the punching position.
[0006] The present disclosure has been made in view of such circumstances, and provides a progressive press device and a control method capable of accurately adjusting the deviation of the punching position.
Means for Solving the Problems
[0007] The progressive press apparatus relating to this disclosure is A conveying section for transporting strip-shaped steel plates, Multiple presses arranged in the direction of conveyance of the aforementioned strip-shaped steel plate, A printing section for printing outlines indicating punching locations of the multiple presses onto the strip-shaped steel plate, A recognition unit that recognizes the shape of the outline after punching out the strip-shaped steel plate, Equipped with, A progressive press apparatus that sequentially punches out the strip-shaped steel plate, on which the outline lines have been printed by the printing unit, using a plurality of presses while the plate is being transported by the transport unit, based on the outline lines, Based on the shape of the contour line recognized by the recognition unit, the conveying unit controls at least one of the feed amount in the conveying direction and the movement amount in the width direction.
[0008] The progressive press apparatus according to this disclosure can determine if the punching position is misaligned based on the shape of the contour line. Therefore, by controlling at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section, the misalignment of the punching position can be precisely adjusted.
[0009] The recognition unit recognizes the shape of the contour line using an image, In the aforementioned image, if the outline of the strip-shaped steel plate is missing due to punching, at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit may be controlled. With this configuration, the progressive press can determine if the punching position is misaligned due to missing contour lines. Therefore, by controlling at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section, the misalignment of the punching position can be precisely adjusted.
[0010] Furthermore, based on the amount and direction of misalignment between the contour line of the strip-shaped steel plate and the edge of the hole formed by punching, at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit may be controlled. With this configuration, the progressive press can determine if the punching position is misaligned because the contour line and the edge of the punched hole are misaligned. Based on the amount and direction of the misalignment between the contour line and the edge of the punched hole, the press controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport section. Therefore, the misalignment of the punching position can be precisely adjusted.
[0011] The progressive press apparatus relating to this disclosure is A progressive press apparatus that sequentially punches out strip-shaped electrical steel sheets using multiple presses arranged in the direction of transport of the strip-shaped electrical steel sheets, while transporting the strip-shaped electrical steel sheets, The device comprises coils provided at predetermined intervals from the side surface of the strip-shaped electromagnetic steel sheet, Based on the value of the induced current in the coil generated by transporting the strip-shaped electrical steel sheet, at least one of the feed amount in the transport direction and the movement amount in the width direction of the strip-shaped electrical steel sheet is controlled.
[0012] The progressive press apparatus according to this disclosure can determine if the punching position is misaligned based on the value of the induced current. Therefore, by controlling at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section, the misalignment of the punching position can be precisely adjusted.
[0013] The control method relating to this disclosure is: A control method for a progressive press apparatus that transports a strip of steel plate on which outline lines indicating punching locations for multiple presses are printed, and sequentially punches the steel plate using the multiple presses based on the outline lines, The shape of the outline after punching out the strip-shaped steel plate is recognized, Based on the recognized contour shape, the transport unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction. The computer performs the process.
[0014] In the control method according to the present disclosure, it is possible to determine that the punching position is deviated from the shape of the contour line. Therefore, by controlling at least one of the feed amount in the conveyance direction and the movement amount in the width direction in the conveyance unit, the deviation of the punching position can be accurately adjusted.
Effect of the Invention
[0015] According to the present disclosure, it is possible to provide a progressive press device and a control method capable of accurately adjusting the deviation of the punching position.
Brief Description of the Drawings
[0016] [Figure 1] It is a block diagram of the progressive press device according to Embodiment 1. [Figure 2] It is a plan view of the progressive press device according to Embodiment 1. [Figure 3] It is a flowchart showing the operation flow of the progressive press device according to Embodiment 1. [Figure 4] It is a view showing a part of the strip steel sheet after punching using the progressive press device according to Embodiment 1. [Figure 5] It is a block diagram of the progressive press device according to Embodiment 2. [Figure 6] It is a plan view of the progressive press device according to Embodiment 2.
Modes for Carrying Out the Invention
[0017] Hereinafter, the present disclosure will be described through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Also, not all of the configurations described in the embodiments are essential as means for solving the problems. For clarity of explanation, the following description and drawings are appropriately omitted and simplified. In each drawing, the same elements are denoted by the same reference numerals, and redundant explanations are omitted as necessary. Of course, the right-handed xyz orthogonal coordinates shown in the drawings are for convenience of explaining the positional relationship of the components. Usually, the positive direction of the z-axis is vertically upward, and the xy plane is a horizontal plane.
[0018] (Embodiment 1) <Configuration of a progressive press machine> First, the configuration of the progressive press machine will be explained with reference to Figures 1 and 2. Figure 1 is a block diagram of the progressive press machine according to Embodiment 1. Figure 2 is a plan view (xy plan view) of the progressive press machine according to Embodiment 1.
[0019] As shown in Figure 1, the progressive press machine 10 according to Embodiment 1 comprises a transport unit 11, a press unit 12, a printing unit 13, a control unit 14, and a recognition unit 15. Note that in Figure 2, the printing unit 13, the control unit 14, and the recognition unit 15 are omitted.
[0020] First, the strip steel sheet 40 and the conveying unit 11 will be explained. Motor cores such as rotor cores and stator cores are formed by laminating the steel sheets 50 shown in Figure 2. The steel sheets 50 are formed by punching out the strip steel sheet 40 using a progressive press device 10. Figure 2 shows the case of forming a steel sheet 50 for a rotor core. As shown in Figure 2, the strip steel sheet 40 is installed in the progressive press device 10. The strip steel sheet 40 is usually prepared in a coiled state (not shown).
[0021] As shown in Figure 2, the conveying section 11 consists of a feeder 21 and guide rollers 31. The feeder 21 is composed of a pair of rollers that sandwich the material from above and below, with one being the drive roller and the other the driven roller. In the example shown in Figure 2, the feeder 21 moves the strip steel plate 40 in the positive x-axis direction. That is, the positive x-axis direction is the conveying direction of the strip steel plate 40. The negative x-axis direction side is referred to as the upstream side of the progressive press device 10, and the positive x-axis direction side is referred to as the downstream side of the progressive press device 10.
[0022] As shown in Figure 2, the feeder 21 transports the strip steel plate 40 from the upstream side to the downstream side. In the example shown in Figure 2, feeders 21 are provided on both the upstream and downstream sides of the progressive press machine 10, and either one or both constitute the feeding means.
[0023] As shown in Figure 2, the guide rollers 31 are cylindrical driven rollers positioned to contact both ends of the strip-shaped steel plate 40, with their central axis aligned with the z-axis direction. The guide rollers 31 are provided at predetermined intervals in the direction of transport of the strip-shaped steel plate 40. In the example shown in Figure 2, there are four guide rollers 31 on one side, for a total of eight guide rollers 31 on both sides.
[0024] The amount of feed between the feeder 21 and the guide roller 31 in the transport direction is adjustable. Furthermore, by adjusting the widthwise position of the guide roller 31 relative to the strip steel plate 40, the amount of widthwise movement of the strip steel plate 40 in the transport section 11 can be adjusted. Additionally, by applying a feed angle to the feeder 21, the amount of widthwise movement of the strip steel plate 40 can be adjusted. As will be described later, if the strip steel plate 40 is transported in a meandering manner, the meandering can be corrected by controlling at least one of the feed amount and the widthwise movement of the strip steel plate 40 in the transport section 11.
[0025] The press section 12 is composed of multiple presses P1, P2, and P3 arranged in the direction of transport of the strip steel sheet. The multiple presses P1, P2, and P3 shown in Figure 2 are for illustrative purposes only, and their arrangement, size, shape, etc., are not limited to those shown in Figure 2. The presses P1, P2, and P3 have punches (not shown) that move up and down along a central axis centered on each of the holes 41, 42, and 43, which are the punching locations in the strip steel sheet 40. When the punch comes into contact with the strip steel sheet 40 as it moves from the positive z-axis direction to the negative z-axis direction, the strip steel sheet 40 is punched out at each of the holes 41, 42, and 43.
[0026] Press machine P1 creates holes 41 in the strip steel plate 40 by punching. Press machine P2 creates holes 42 in the strip steel plate 40 by punching. Press machine P3 creates holes 43 in the strip steel plate 40 by punching. The strip steel plate 40 is conveyed in the conveying direction and punched sequentially by the multiple press machines P1, P2, and P3.
[0027] The steel plate 50 for the rotor core is formed by punching in the press section 12. The hole 41 in the steel plate 50 is where the rotor's rotating shaft is inserted, and the hole 42 is where a magnet is inserted. As shown in Figure 2, the hole 43 is on the outer circumference of the steel plate 50 for the rotor core.
[0028] The printing unit 13 prints outline lines on the strip steel plate 40 indicating the punching locations of multiple presses P1, P2, and P3. In the example shown in Figure 2, the printing unit 13 (not shown) prints outline lines 33 on the strip steel plate 40. In the example shown in Figure 2, the outline lines 33 are shown as dotted lines, and the edges of the holes punched out by the punching process are shown as solid lines. Note that although the outline lines 33 are shown as dotted lines, they are not limited to this and may also be solid lines.
[0029] The width of the contour line 33 is preferably equal to the dimensional tolerance. For example, if the dimensional tolerance is XX ± 25 micrometers, the printing unit 13 prints a contour line with a width of 50 micrometers based on XX. However, the width of the contour line 33 is not limited to a width based on the dimensional tolerance. The contour line 33 may also be colored. Furthermore, the printing unit 13 may print the contour line 33 so as to fill in the area of the strip-shaped steel plate 40 that is surrounded by the contour line 33, i.e., the punched-out area.
[0030] The printing unit 13 is a stamp with a convex shape on the mold. However, it is not limited to this, and the printing unit 13 may be, for example, an inkjet printer or a laser printer. Alternatively, the printing unit 13 may use thermal transfer printing performed at high temperatures.
[0031] The contour line 33 is removed from the steel plate 50. If the strip steel plate 40 is an electrical steel plate as described later in Embodiment 2, it is preferable to use a cooling oil such as automatic transmission fluid because it is prone to rusting by water. Note that even if the contour line 33 remains on the steel plate 50, it will not affect the quality of the motor.
[0032] The example shown in Figure 2 illustrates the printing of a rotor core shape, but it is not limited to this; a stator core shape could also be printed. The printing unit 13 can also print multiple contour lines 33 simultaneously. Furthermore, when creating both the rotor and stator together, the contour lines of both the rotor and stator can be printed simultaneously.
[0033] The control unit 14 (not shown in Figure 2) controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit 11. The control unit 14 also controls the up-and-down movement of the punch in the press unit 12 and the printing control of the printing unit 13. Furthermore, the control unit 14 controls the recognition processing of the contour line 33 of the recognition unit 15, which will be described later. The control unit 14 includes, for example, a calculation unit such as a CPU (Central Processing Unit) and a storage unit such as RAM (Random Access Memory) and ROM (Read Only Memory) that store various control programs and data. In other words, the control unit 14 has the functionality of a computer and performs various processes based on the various control programs mentioned above.
[0034] The control of the transport section by the control unit 14 is for adjusting the meandering of the strip steel plate 40. When meandering occurs, errors accumulate downstream of the progressive press device 10, and the dimensional accuracy deteriorates significantly. As a result, the air gap increases, affecting the quality of the motor. To adjust the mechanism to eliminate the meandering of the strip steel plate 40, it is preferable to control the feed amount of the guide roller 31 in the transport direction and its position in the width direction relative to the strip steel plate 40. Alternatively, the meandering of the strip steel plate 40 may be adjusted by controlling the feed amount and feed angle of the feeder 21 in the transport direction.
[0035] The recognition unit 15 recognizes the shape of the contour line after punching out the strip of steel sheet. The recognition unit 15 acquires, for example, an image of the strip of steel sheet after punching out, which is captured by a camera. In this case, the progressive press machine 10 may be equipped with a camera. However, it is not limited to this, and the progressive press machine 10 may not be equipped with a camera, or it may be equipped with a camera that can transmit and receive data with the progressive press machine 10. As another example, the recognition unit 15 is a laser scanner. In this case, the progressive press machine 10 may be equipped with a laser scanner. However, it is not limited to this, and the progressive press machine 10 may not be equipped with a laser scanner, or it may be equipped with a laser scanner that can transmit and receive data with the progressive press machine 10. In Figure 2, an idle time is provided between press machine P2 and press machine P3. It is preferable that the recognition unit 15 recognizes the contour line 33 during this idle time. Of course, the recognition unit 15 may also recognize the contour line 33 after each press.
[0036] <Operation of the progressive press machine> Next, the operation of the progressive press will be explained with reference to Figures 2 and 3. Figure 3 is a flowchart showing the operation flow of the progressive press. First, the progressive press device 10 transports the strip steel sheet 40 (step ST1). More specifically, the feeder 21 pressurizes the strip steel sheet 40 as it passes through. As a result, as shown in Figure 2, the strip steel sheet 40 begins to move in the transport direction due to the feeder 21.
[0037] Next, the progressive press device 10 prints contour lines on the strip steel sheet 40 indicating the punching locations of multiple presses (step ST2). More specifically, as shown in Figure 2, the printing unit 13 (not shown) prints contour lines 33 on the strip steel sheet 40.
[0038] Next, the progressive press 10 punches out the strip steel sheet 40 (step ST3). More specifically, as shown in Figure 2, the press section 12 punches out the strip steel sheet 40 to form holes 41, 42, and 43. This forms the steel sheet 50 for the rotor core shown in Figure 2.
[0039] Next, the progressive press machine 10 recognizes the shape of the outline of the strip steel sheet after punching (step ST4). More specifically, the recognition unit 15 acquires an image of the strip steel sheet after punching, which is captured by the camera. The recognition unit 15 then recognizes the shape of the outline of the strip steel sheet after punching from the acquired image.
[0040] Next, the progressive press device 10 determines whether or not the outline printed on the strip steel sheet 40 is missing (step ST5). More specifically, the control unit 14 determines whether or not the outline printed on the strip steel sheet 40 by the printing unit 13 is missing in the image in which the recognition unit 15 has recognized the shape of the outline. Details on whether or not the outline printed on the strip steel sheet 40 is missing will be described later.
[0041] If the printed contour lines of the printing section 13 are missing from the strip-shaped steel plate 40 (step ST5YES), the progressive press device 10 controls at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section. More specifically, the control unit 14 controls the transport section to adjust at least one of the feed amount in the transport direction and the movement amount in the width direction (step ST6). The method for controlling at least one of the feed amount in the transport direction and the movement amount in the width direction will be described later. On the other hand, if the outline printed by the printing section 13 is not missing from the strip steel sheet 40 (step ST5NO), the progressive press device 10 operates to form a new steel sheet 50 from the strip steel sheet 40.
[0042] As explained with reference to Figures 2 and 3, the progressive press device 10 transports the strip-shaped steel plate 40, on which the outline 33 has been printed by the printing unit 13, by the transport unit 11, and sequentially punches it out using multiple presses P1, P2, and P3 based on the outline 33.
[0043] Figure 3 illustrates an example in which the control unit 14 determines whether or not the printed contour line on the strip-shaped steel plate 40 is missing, and controls at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport unit. However, it is not limited to this, and for example, the control unit 14 may control at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport unit if the shape differs from the shape of the contour line stored in advance.
[0044] In other words, the progressive press 10 can determine if the punching position is misaligned based on the shape of the contour line after punching the strip steel sheet 40. Therefore, the progressive press 10 controls at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section 11. This allows the progressive press 10 to accurately adjust for any misalignment of the punching position.
[0045] In Figure 3, an example is shown in which, after punching out the hole 43 by the press machine P3 (step ST3), the contour shape after punching is recognized and determined (steps ST4, ST5), and the transport unit 11 is controlled (step ST6). However, the method is not limited to this, and the transport unit 11 may also be controlled after punching out the hole 41 by the press machine P1, after which the contour shape after punching is recognized and determined. Furthermore, the transport unit 11 may also be controlled after punching out the hole 42 by the press machine P1, after which the contour shape after punching is recognized and determined.
[0046] <Control of progressive press machine> Next, we will explain the control method for the conveying section of the progressive press machine. Here, referring to Figure 4, we will explain in detail whether or not the printed contour lines are missing, and then describe the control method for the feed amount in the conveying direction and the movement amount in the width direction.
[0047] Figure 4 shows a portion of a strip of steel sheet after punching using the progressive press apparatus according to Embodiment 1. The upper and middle sections of Figure 4 show the strip of steel sheet immediately after holes 43 have been formed by the press machine P3 shown in Figure 2. The lower section of Figure 4 shows the strip of steel sheet immediately after holes 42 have been formed by the press machine P2 shown in Figure 2. In Figure 4, as in Figure 2, the dotted lines indicate the outlines of the areas punched out by the press, and the solid lines indicate the edges of the holes punched out by the punching process.
[0048] In the upper part of Figure 4, the printed contour lines 33 on the strip steel plate 40 are not missing. More specifically, even when the strip steel plate 40 is punched out using presses P1, P2, and P3, all of the printed contour lines 33 remain. In other words, it can be determined that the punching process is within dimensional tolerances. Therefore, in the upper part of Figure 4, since there is no misalignment of the punching position, the control unit controls the transport unit to maintain the feed amount in the transport direction and the movement amount in the width direction.
[0049] In the middle section of Figure 4, the printed contour lines 33 on the strip steel plate 40 are missing. More specifically, even when the strip steel plate 40 is punched out by press machine P1, the contour lines 33 corresponding to the holes 41 remain. However, when the strip steel plate 40 is punched out by press machine P2, the contour lines 33 corresponding to the holes 42 are missing. Furthermore, when the strip steel plate 40 is punched out by press machine P3, the contour lines 33 corresponding to the holes 43 are missing.
[0050] In other words, in the middle section of Figure 4, the contour line 33 is not present on the downstream side in the conveying direction of the strip-shaped steel plate 40, but it remains on the upstream side in the conveying direction, and a shift in the punching position has occurred on the downstream side in the conveying direction. Therefore, in the middle section of Figure 4, a shift in the punching position occurs on the downstream side in the transport direction, so the control unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit. More specifically, the control unit determines that the transport pitch is insufficient and increases the feed amount of the transport unit.
[0051] Furthermore, the control unit may control at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit based on the amount and direction of the misalignment between the contour line of the strip steel plate and the edge of the hole formed by punching. The amount and direction of the misalignment between the contour line of the strip steel plate and the edge of the hole formed by punching can be calculated, for example, by image processing using calibration and alignment.
[0052] More specifically, in the middle section of Figure 4, the control unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport unit based on the amount of displacement and direction of displacement between the edge of the hole 43 and the contour line 33 corresponding to the hole 43. However, it is not limited to this, and the control unit may also control at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport unit based on the amount of displacement and direction of displacement between the edge of the hole 42 and the contour line 33 corresponding to the hole 42.
[0053] In the lower part of Figure 4, the printed contour lines 33 on the strip steel plate 40 are missing. More specifically, even when the strip steel plate 40 is punched out by the press machine P1, the contour lines 33 corresponding to the holes 41 remain. However, when the strip steel plate 40 is punched out by the press machine P2, the contour lines 33 corresponding to the holes 42 are missing. Therefore, in the lower part of Figure 4, a misalignment occurs in the punching position, so the control unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit. More specifically, based on the amount and direction of misalignment between the edge of the hole 42 and the contour line 33 corresponding to the hole 42, the control unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit.
[0054] Thus, in the progressive press machine according to Embodiment 1, it is possible to determine that the punching position is misaligned by the absence of a contour line. Therefore, by controlling at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section, the misalignment of the punching position can be precisely adjusted. As a result, rotors and stators with excellent dimensional accuracy can be formed, the air gap can be reduced, and torque can be improved.
[0055] Furthermore, since at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section can be controlled from the contour line, the edge of the punched hole, the amount of misalignment, and the direction of misalignment, the misalignment of the punching position can be precisely adjusted regardless of the direction in which the punching position is misaligned.
[0056] (Embodiment 2) <Progressive press machine using coils> First, the configuration of the progressive press apparatus according to Embodiment 2 will be described with reference to Figures 5 and 6. Figure 5 is a block diagram of the progressive press apparatus according to Embodiment 2. Figure 6 is a plan view (xy plan view) of the progressive press apparatus according to Embodiment 2. As shown in Figure 5, the progressive press apparatus 20 according to Embodiment 2 comprises a transport unit 11, a press unit 12, a control unit 14, and a coil 23. The transport unit 11, press unit 12, and control unit 14 in the progressive press apparatus 20 according to Embodiment 2 are the same as those in the progressive press apparatus according to Embodiment 1, so their explanation will be omitted. Here, we will explain the coil 23. Note that in Figure 6, the control unit 14 and coil 23 are omitted.
[0057] As shown in Figure 6, the coil 23 is provided at a predetermined distance from the side surface of the strip-shaped electrical steel sheet 60. In the example shown in Figure 6, it is provided at both ends of the side surface of the strip-shaped electrical steel sheet 60, but it is not limited to this, and may be provided on one side of the side surface of the strip-shaped electrical steel sheet 60.
[0058] When the strip-shaped electrical steel sheet 60 is conveyed in the conveying direction, an induced current is generated in the coil 23. The progressive press device 10 controls at least one of the feed amount in the conveying direction and the movement amount in the width direction of the strip-shaped electrical steel sheet based on the value of the induced current in the coil 23.
[0059] More specifically, when the coil 23 detects an induced current, the control unit 14 determines whether the current falls within a range of arbitrary values. If the current does not fall within the range of arbitrary values, the control unit 14 controls at least one of the feed amount in the transport direction and the movement amount in the width direction of the transport unit to bring the current within the range of arbitrary values. On the other hand, if the current falls within the range of arbitrary values, the control unit 14 controls the feed amount in the transport direction and the movement amount in the width direction of the transport unit to maintain that range.
[0060] Figures 5 and 6 illustrate an example of controlling at least one of the feed amount in the transport direction and the movement amount in the width direction during transport based on the value of the induced current in the coil 23. Another example of controlling the movement amount in the width direction in the transport section is a method of controlling it based on the distance from the side surface of the strip-shaped electrical steel sheet 60 to the coil 23.
[0061] In this case, the coil 23 is equipped with a distance sensor. This allows the distance sensor to detect the distance from the side surface of the strip-shaped electrical steel sheet 60 to the coil 23. The control unit 14 then determines whether the distance detected by the distance sensor is an arbitrary distance. If the distance detected by the distance sensor is not an arbitrary distance, the control unit 14 controls the amount of movement of the transport unit in the width direction so that the distance detected by the distance sensor becomes an arbitrary distance. On the other hand, if the distance detected by the distance sensor is an arbitrary distance, the control unit 14 controls the amount of movement of the strip-shaped electrical steel sheet in the width direction in the transport direction to maintain that amount.
[0062] Here, we have described a case where a distance sensor is used to detect the distance from the side surface of the strip-shaped electrical steel sheet 60 to the coil 23. However, the invention is not limited to this, and any sensor capable of detecting the distance from the side surface of the strip-shaped electrical steel sheet 60 to the coil 23 is acceptable. Examples of such sensors include proximity sensors, CMOS (Complementary Metal Oxide Semiconductor) type laser sensors, TOF (Time of Flight) type laser sensors, and ultrasonic sensors.
[0063] Thus, the progressive press apparatus according to Embodiment 2 can determine if the punching position is misaligned from the value of the induced current. Therefore, by controlling at least one of the feed amount in the transport direction and the movement amount in the width direction in the transport section, the misalignment of the punching position can be precisely adjusted.
[0064] Furthermore, some or all of the processing in the control unit according to Embodiments 1 and 2 described above can be implemented as a computer program. Such a program can be stored using various types of non-temporary computer-readable media and supplied to a computer. Non-temporary computer-readable media include various types of tangible control media. Examples of non-temporary computer-readable media include magnetic control media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical control media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / Ws, and semiconductor memories (e.g., mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (Random Access Memory)). Programs may also be supplied to a computer by various types of temporary computer-readable media. Examples of temporary computer-readable media include electrical signals, optical signals, and electromagnetic waves. Temporary computer-readable media can be supplied to a computer via wired communication channels such as electric wires and optical fibers, or via wireless communication channels.
[0065] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its intent. [Explanation of Symbols]
[0066] 10, 20 Progressive press machine 11 Conveying section 12 Press Department 13 Printing Department 14 Control Unit 15 Recognition part 21 feeders 23 coils 31 Guide rollers 33 Outline 40 strip steel plates 41, 42, 43 holes 50 steel plate 60 Strip-shaped electrical steel sheet P1, P2, P3 press machines
Claims
1. A conveying section for transporting strip-shaped steel plates, Multiple presses arranged in the direction of conveyance of the aforementioned strip-shaped steel plate, A printing section for printing outlines indicating punching locations of the multiple presses onto the strip-shaped steel plate, A recognition unit that recognizes the shape of the outline after punching out the strip-shaped steel plate, Equipped with, A progressive press apparatus that sequentially punches out the strip-shaped steel plate, on which the outline lines have been printed by the printing unit, using a plurality of presses while the plate is being transported by the transport unit, based on the outline lines, Based on the shape of the contour line recognized by the recognition unit, the transport unit controls at least one of the feed amount in the transport direction and the movement amount in the width direction. Progressive die press machine.
2. The recognition unit recognizes the shape of the contour line using an image, In the aforementioned image, when the outline of the strip-shaped steel plate is missing due to punching, the conveying unit controls at least one of the feed amount in the conveying direction and the movement amount in the width direction. The progressive press apparatus according to claim 1.
3. Based on the amount and direction of misalignment between the contour line of the strip-shaped steel plate and the edge of the hole formed by punching, at least one of the feed amount in the conveying direction and the movement amount in the width direction of the conveying unit is controlled. The progressive press apparatus according to claim 1 or 2.
4. A control method for a progressive press apparatus that transports a strip of steel plate on which outline lines indicating punching locations for multiple presses are printed, and sequentially punches the steel plate using the multiple presses based on the outline lines, The shape of the outline after punching out the strip-shaped steel plate is recognized, Based on the recognized contour shape, control at least one of the feed amount in the transport direction and the movement amount in the width direction of the strip-shaped steel plate. The computer performs the process. Control method.