Progressive die press

Abstract

The present invention provides a progressive press device that suppresses vertical vibration of the workpiece. [Solution] The present disclosure relates to a progressive press device for transporting a sheet-shaped workpiece W and punching out the workpiece W, comprising an upper die located above the workpiece W and a lower die 21 located below the workpiece W, wherein the lower die 21 is provided with guides 25 at both ends in the width direction of the workpiece W on which the workpiece W is placed when punching out the workpiece W, and the guides 25 are provided with restricting portions 25e that restrict the central part of the workpiece W in the width direction from being pulled upward.

Description

Technical Field

[0001] This disclosure relates to a progressive press device.

Background Art

[0002] In a progressive press device that punches a sheet-like workpiece in multiple steps, with the thinning of the workpiece and the increase in the conveying speed, vertical vibrations occur in the workpiece.

[0003] Patent Document 1 discloses a progressive press device having guide portions that extend along the conveying direction on both sides in the workpiece width direction and restrict the movement of the workpiece in the workpiece width direction, and pressing portions that protrude inward in the workpiece width direction from the guide portions, and the pressing portions suppress the vertical vibration of the workpiece. [[ID=1十八]]

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in Patent Document 1, there is a possibility that the holes formed in the workpiece may get caught on the pressing portions, causing poor conveyance. This disclosure solves such problems and provides a progressive press device that suppresses the vertical vibration of the workpiece.

Means for Solving the Problems

[0006] This disclosure relates to a progressive press machine for transporting a sheet-like workpiece and punching out the workpiece, comprising an upper die located above the workpiece and a lower die located below the workpiece, wherein the lower die is provided with guides at both ends in the width direction of the workpiece on which the workpiece is placed when punching out the workpiece, and the guides are provided with restricting portions that restrict the central part of the workpiece in the width direction from being pulled upward. This configuration suppresses vertical vibrations of the workpiece.

[0007] At both ends of the workpiece in the width direction, there are bent portions that are folded downward, and the restricting portion is a wall portion formed by a wall extending in the vertical direction, with the bent portions of the workpiece positioned outside the wall portion in the width direction of the workpiece. This configuration suppresses vertical vibration of the workpiece.

[0008] The workpiece has upwardly recessed recesses at both ends in the width direction, and the restricting portion is a convex portion formed by a projection, with the recesses of the workpiece fitting into the convex portion. This configuration suppresses vertical vibration of the workpiece.

[0009] The restricting portion is a wall formed by walls extending in the vertical direction, with through members passing through both ends of the workpiece, and the tips of the through members protruding from the workpiece positioned outside the wall portion in the width direction of the workpiece. This configuration suppresses vertical vibration of the workpiece. [Effects of the Invention]

[0010] This disclosure provides a progressive press device that suppresses vertical vibration of the workpiece. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of the progressive press apparatus according to Embodiment 1. [Figure 2] This is a cross-sectional view of the second lower type, as seen from direction II, along the dashed-dotted line in Figure 1. [Figure 3] This is a cross-sectional view of the second lower type, as seen from direction II, along the dashed-dotted line in Figure 1, showing the state in which the movable stripper is lowered. [Figure 4] Figure 1 shows a progressive press apparatus, and is a schematic top view of the second lower die. [Figure 5] This is a cross-sectional view of the second lower die of a progressive press apparatus according to Embodiment 2, corresponding to Figure 3. [Figure 6] This is a cross-sectional view of the second lower die, corresponding to Figure 3, of a progressive press apparatus according to Embodiment 3. [Modes for carrying out the invention]

[0012] The embodiments of this disclosure will be described below with reference to Figures 1 to 6. Figure 1 is a schematic configuration diagram of the progressive press apparatus of Embodiment 1. Figure 2 is a cross-sectional view of the second lower die as seen from direction II along the dashed-dotted line in Figure 1. Figure 3 is a cross-sectional view of the second lower die as seen from direction II along the dashed-dotted line in Figure 1, showing the state in which the movable stripper has been lowered. Figure 4 is a schematic top view of the second lower die of the progressive press apparatus of Figure 1. Figure 5 is a cross-sectional view of the second lower die of the progressive press apparatus of Embodiment 2, corresponding to Figure 3. Figure 6 is a cross-sectional view of the second lower die of the progressive press apparatus of Embodiment 3, corresponding to Figure 3.

[0013] It should be noted that the right-handed XYZ Cartesian coordinate system shown in Figures 1 to 6 is merely a convenient representation for explaining the positional relationships of the constituent elements. In Figures 1 to 6, the positive Z-axis is vertically upward, and the XY plane is horizontal.

[0014] Embodiment 1 A progressive press apparatus 1 according to Embodiment 1 will be described using Figures 1 to 4. The progressive press apparatus 1 is a device that forms motor core members, which will become motor cores for motors, from a sheet-like workpiece W. As shown in Figure 1, the progressive press apparatus 1 has a supply unit 2, a first transport unit 3, a first die 10, a second transport unit 4, a second die 20, and a third transport unit 5. In the progressive press apparatus 1, the workpiece W is transported in the positive X-axis direction in Figure 1.

[0015] In the supply unit 2, a sheet-like workpiece W formed of an electromagnetic steel sheet is wound in a coil shape. When the supply unit 2 rotates in the direction of the arrow, the workpiece W is supplied.

[0016] The first conveying unit 3 is composed of a pair of rolls. When the pair of rolls of the first conveying unit 3 rotate in the direction of the arrow, the workpiece W is sandwiched and conveyed to the first die 10.

[0017] The first die 10 has a first lower die 11 and a first upper die 15. The first lower die 11 is located below the workpiece W conveyed from the first conveying unit 3 and supports the workpiece W from below. The first upper die 15 is located above the workpiece W and presses the workpiece W by moving up and down.

[0018] The first lower die 11 has a die holder 12, a die 13, and a lifter 14. The die holder 12 is fixed to the floor surface and supports the die 13 and the lifter 14. The die 13 is attached to the upper surface of the die holder 12 and supports from below when pressing the workpiece W.

[0019] The lifter 14 is fitted into a recess (not shown) provided at the upper part of the die 13. A spring is arranged below the lifter 14, and due to the elastic force of the spring, the upper part of the lifter 14 is positioned above the upper surface of the die 13. At the same time, the lifter 14 lifts the workpiece W upward and supports the workpiece W in a state of being separated from the die 13. When the plate presser 17 described later descends, the workpiece W is pressed against the die 13, and the entire lifter 14 enters the recess.

[0020] The first upper die 15 has a punch holder 16, a plate presser 17, a cutter 18, and a punch 19. The punch holder 16 is lifted and lowered in the vertical direction (Z-axis direction in FIG. 1) by a driving device (not shown). The plate presser 17 is suspended and held by the punch holder 16 by a connecting member {16a}. When the punch holder 16 descends, the plate presser 17 descends and presses the workpiece W against the die 13.

[0021] The cutter 18 and punch 19 are mounted on the lower surface of the punch holder 16. The cutter 18 is located upstream of the punch 19 in the conveying direction. The cutter 18 and punch 19 are provided in pairs at both ends of the punch holder 16 in the width direction (Y-axis direction in Figure 1).

[0022] With the workpiece W pressed against the die 13 by the plate holder 17, the cutter 18 cuts both ends of the workpiece W in the width direction as the punch holder 16 descends. As the punch holder 16 descends while the workpiece W is pressed against the die 13 by the plate holder 17, the punch 19 bends both ends of the workpiece W in the width direction into an L-shape when viewed in the transport direction (X-axis direction in Figure 1) (see Figure 2). In this way, downward-bent bent portions W1 are formed at both ends of the workpiece W in the width direction.

[0023] The progressive press device 1 transports the workpiece W at a feed pitch P. The progressive press device 1 cuts both ends of the workpiece W in the width direction with a cutter 18, and after transporting the workpiece W at the feed pitch P, it bends both ends of the workpiece W in the width direction into an L-shape with a punch 19.

[0024] The workpiece W, whose widthwise ends are bent into an L-shape in the first mold 10, is transported to the second transport section 4. The second transport section 4 is composed of a pair of rolls. When the pair of rolls in the second transport section 4 rotate in the direction of the arrow, they grip the workpiece W and transport it to the second mold 20. The length of the pair of rolls in the second transport section 4 is set so as to grip the central part of the workpiece W.

[0025] The second mold 20 forms the motor core component from the workpiece W by performing three types of punching. Here, only the final punching process among the three types of punching will be explained.

[0026] As shown in Figure 4, the second die 20 is configured to punch out three rows simultaneously in the width direction. As shown in Figure 1, the second die 20 has a second lower die 21 and a second upper die 31. The second lower die 21 is located below the workpiece W being transported from the second transport unit 4 and supports the workpiece W from below. The second upper die 31 is located above the workpiece W and presses the workpiece W by moving up and down.

[0027] The second lower mold 21 includes a die holder 22, a die 23, a lifter 24, and a guide 25. The die holder 22 is fixed to the floor and supports the die 23, lifter 24, and guide 25. The die holder 22 is provided with an outlet 22a through which the motor core component cut out from the workpiece W by punching is discharged.

[0028] The die 23 is mounted on the upper surface of the die holder 22 and supports the workpiece W from below when it is press-formed. As shown in Figure 4, the die 23 has a die hole 23a that penetrates in the vertical direction (Z-axis direction in Figure 4). There is one die hole 23a in each row, and the die holes 23a in each row are offset from each other in the transport direction (X-axis direction in Figure 4). The die holes 23a are in communication with the discharge port 22a of the die holder 22. When the punch 34, which will be described later, is inserted into the die hole 23a, a motor core member with a shape that conforms to the outer shape of the die hole 23a is cut out by punching.

[0029] As shown in Figure 2, the lifter 24 is fitted into a recess 23b provided on the upper part of the die 23. A spring 24a is positioned below the lifter 24, and the elastic force of the spring 24a positions the upper part of the lifter 24 above the upper surface of the die 23. At the same time, the lifter 24 lifts the workpiece W upward and supports the workpiece W in an isolated state from the die 23. As shown in Figure 3, when the movable stripper 33, which will be described later, descends, the workpiece W is pressed against the die 23, and the entire lifter 24 enters the recess 23b.

[0030] As shown in Figures 1 to 3, the guides 25 are provided on the upper surface of the die holder 22. As shown in Figure 1, multiple guides 25 are provided at predetermined intervals in the transport direction (X-axis direction in Figure 1). As shown in Figure 2, the guides 25 are provided at both ends of the die holder 22 in the width direction of the workpiece W (Y-axis direction in Figure 2).

[0031] The guide 25 has an upper part 25a, a side part 25b, and a lower part 25c. The guide side portion 25b extends in the vertical direction (Z-axis direction in Figure 2) and restricts the movement of the workpiece W in the width direction. The upper part 25a of the guide extends inward from the upper part of the side part 25b of the guide in the width direction (Y-axis direction in Figure 2) of the die holder 22, and restricts the upward movement of the workpiece W.

[0032] The lower part of the guide 25c extends inward from the lower part of the guide side 25b in the width direction (Y-axis direction in Figure 2) of the die holder 22. The upper surface of the lower part of the guide 25c is formed at the same height as the upper surface of the die 23. As shown in Figure 3, when the movable stripper 33, which will be described later, descends and presses the workpiece W against the die 23, the end of the workpiece W is placed on the upper surface of the lower part of the guide 25c (the descending movable stripper 33 is shown by a dashed line in Figure 3).

[0033] As shown in Figure 2, a groove 25d is formed in the lower part 25c of the guide. The groove 25d is formed by a groove that is recessed downward (in the negative Z-axis direction in Figure 2) from the upper surface of the lower part 25c of the guide. The groove 25d extends in the direction of conveying the workpiece W (in the X-axis direction in Figure 2) and extends to both ends of the guide 25. The depth D1 of the groove 25d is formed to be longer than the length L1 of the bent portion W1 of the workpiece W.

[0034] The lower part of the guide 25c has a wall portion 25e formed by a wall extending in the vertical direction (Z-axis direction in Figure 2). The wall portion 25e is a wall that constitutes the groove portion 25d and is formed by a wall located on the inside in the width direction of the workpiece W. The bent portion W1 of the workpiece W is positioned outside the wall portion 25e in the width direction of the workpiece W.

[0035] As shown in Figure 1, the second upper die 31 has a punch holder 32, a movable stripper 33, and a punch 34. The punch holder 32 moves up and down (in the Z-axis direction in Figure 1) by a drive mechanism (not shown). The movable stripper 33 is suspended and held by the punch holder 32 by a connecting member 32a. The movable stripper 33 has a punch insertion hole 33a through which the punch 34 is inserted. As shown in Figure 3, when the punch holder 32 is lowered, the movable stripper 33 is lowered and presses the workpiece W against the die 23.

[0036] As shown in Figure 1, the punch 34 is attached to the lower surface of the punch holder 32. The punch 34 is positioned vertically above the die hole 23a (see Figure 4) formed in the die 23 (positive Z-axis direction in Figure 1). One punch 34 is provided in each row in the width direction of the punch holder 32, and the punches 34 in each row are offset from each other in the transport direction (X-axis direction in Figure 1). When the punch holder 32 descends while the workpiece W is pressed against the die 23 by the movable stripper 33, the punch 34 is inserted into the die hole 23a and cuts out the motor core member from the workpiece W. In this way, punching is performed in the second die 20.

[0037] The workpiece W punched out by the second die 20 is transported to the third transport section 5. In Embodiment 1, the bending and punching of the workpiece W were performed using separate dies (first die 10 and second die 20), but it is also acceptable to perform both processes using a single die.

[0038] The motor core component is formed by punching in the second mold 20 through the following steps (1) to (5). (1) The punch holder 32 is lowered and the workpiece W is pressed against the die 23 with the movable stripper 33. (2) Further lower the punch holder 32 and insert the punch 34 into the die hole 23a to cut out the motor core member from the workpiece W. (3) Raise the punch holder 32 and pull the punch 34 out of the die hole 23a. (4) Further raise the punch holder 32 and the movable stripper 33 to separate it from the workpiece W. (5) The first transport unit 3, the second transport unit 4, and the third transport unit 5 are rotated to feed the workpiece W and transport it by a pitch P.

[0039] In modern progressive presses, the thinning of workpieces and the increase in conveying speeds have led to vertical vibrations in the workpieces. Specifically, when the movable stripper 33 is raised, the center of the workpiece W in the width direction (the center in the left-right direction in Figure 3) that is in contact with the lower surface of the movable stripper 33 does not separate from the movable stripper 33 and is pulled upward. As a result, the workpiece W vibrates vertically. If the workpiece W is conveyed while vibrating vertically, the holes formed in the workpiece W by punching may get caught in the die holes 23a, potentially causing conveying problems.

[0040] Therefore, in Embodiment 1, a guide 25 with a wall portion 25e is provided, and the bent portion W1 of the workpiece W is positioned outside the wall portion 25e in the width direction of the workpiece W. When the movable stripper 33 rises, an upward pulling force acts on the center of the workpiece W in the width direction, and a force acts on the end of the workpiece W in the width direction to pull it towards the center of the workpiece W. However, in Embodiment 1, since the bent portion W1 is locked to the wall portion 25e, the end of the workpiece W in the width direction is not pulled towards the center of the workpiece W in the width direction, and the center of the workpiece W in the width direction is not pulled upward. In this way, vertical vibration of the workpiece W is suppressed in Embodiment 1. The wall portion 25e functions as a restricting portion that restricts the center of the workpiece W in the width direction from being pulled upward.

[0041] Embodiment 2 Figure 5 is a cross-sectional view of the second lower die 51, corresponding to Figure 3, in the progressive press apparatus of Embodiment 2. Compared with the progressive press apparatus 1 of Embodiment 1, the configuration of the first die, the workpiece, and the second lower die differs in the progressive press apparatus of Embodiment 2. The other configurations are the same as in Embodiment 1, so their explanation is omitted.

[0042] As shown in Figure 5, in Embodiment 2, recesses W2 are formed at both ends of the workpiece W in the width direction, with the lower surface of the workpiece W being recessed upward. The recesses W2 of the workpiece W are formed by a U-shaped bending process using the first die. In Embodiment 2, the bending and punching processes of the workpiece W are performed using separate dies (first die and second die), but they may also be performed using a single die.

[0043] As shown in Figure 5, in Embodiment 2, a guide 52 is provided on the upper surface of the die holder 22. Multiple guides 52 are provided at predetermined intervals in the transport direction (X-axis direction in Figure 5). As shown in Figure 5, the guides 52 are provided at both ends of the die holder 22 in the width direction of the workpiece W (Y-axis direction in Figure 5).

[0044] The guide 52 has an upper part 52a, a side part 52b, and a lower part 52c. The guide side portion 52b extends in the vertical direction (Z-axis direction in Figure 5) and restricts the movement of the workpiece W in the width direction. The upper part 52a of the guide extends inward from the upper part of the side part 52b of the guide in the width direction (Y-axis direction in Figure 5) of the die holder 22, and restricts the upward movement of the workpiece W.

[0045] The lower part of the guide 52c extends inward from the lower part of the guide side 52b in the width direction (Y-axis direction in Figure 5) of the die holder 22. The upper surface of the lower part of the guide 52c (the upper surface other than the convex part 52d, which will be described later) is formed at the same height as the upper surface of the die 23. When the movable stripper 33 descends and the workpiece W is pressed against the die 23, the end of the workpiece W is placed on the upper surface of the lower part of the guide 52c (the descending movable stripper 33 is shown by a dashed line in Figure 5).

[0046] A protrusion 52d is provided on the lower part 52c of the guide. The protrusion 52d is formed by a rectangular parallelepiped projection that extends upward (in the positive Z-axis direction in Figure 5) from the upper surface of the lower part 52c of the guide. The protrusion 52d extends in the direction of transport of the workpiece W (in the X-axis direction in Figure 5) and extends to both ends of the guide 52. The width D2 of the protrusion 52d is formed to be slightly smaller than the width L2 of the recess W2 of the workpiece W. The height D3 of the protrusion 52d is formed to be approximately the same as the depth L3 of the recess W2 of the workpiece W. The recess W2 of the workpiece W is fitted into the protrusion 52d.

[0047] In Embodiment 2, even if the movable stripper 33 rises and a force acts to pull the center of the workpiece W in the width direction upward, the recess W2 of the workpiece W is locked to the protrusion 52d, so the center of the workpiece W in the width direction is not pulled upward. In this way, vertical vibration of the workpiece W is suppressed in Embodiment 2. The protrusion 52d functions as a restricting part that restricts the center of the workpiece W in the width direction from being pulled upward.

[0048] Embodiment 3 Figure 6 is a cross-sectional view of the second lower die 61, corresponding to Figure 3, in a progressive press apparatus of Embodiment 3. Compared with the progressive press apparatus 1 of Embodiment 1, the configuration of the first die, the workpiece, and the second lower die differs in the progressive press apparatus of Embodiment 3. The other configurations are the same as in Embodiment 1, so their explanation is omitted.

[0049] In Embodiment 3, since the workpiece W is not bent, the first mold is not provided.

[0050] As shown in Figure 6, in Embodiment 3, a guide 62 is provided on the upper surface of the die holder 22. Multiple guides 62 are provided at predetermined intervals in the transport direction (X-axis direction in Figure 6). As shown in Figure 6, the guides 62 are provided at both ends of the die holder 22 in the width direction of the workpiece W (Y-axis direction in Figure 6).

[0051] The guide 62 has an upper part 62a, a side part 62b, and a lower part 62c. The guide side portion 62b extends in the vertical direction (Z-axis direction in Figure 6) and restricts the movement of the workpiece W in the width direction. The upper part of the guide 62a extends inward from the upper part of the side part of the guide 62b in the width direction (Y-axis direction in Figure 6) of the die holder 22, and restricts the upward movement of the workpiece W.

[0052] The lower guide portion 62c extends inward from the lower part of the guide side portion 62b in the width direction (Y-axis direction in Figure 6) of the die holder 22. The upper surface of the lower guide portion 62c is formed at the same height as the upper surface of the die 23. When the movable stripper 33 descends and the workpiece W is pressed against the die 23, the end of the workpiece W is placed on the upper surface of the lower guide portion 62c (the descending movable stripper 33 is shown by a dashed line in Figure 6).

[0053] A groove 62d is provided in the lower part 62c of the guide. The groove 62d is formed by a groove that is recessed downward (in the negative Z-axis direction in Figure 6) from the upper surface of the lower part 62c of the guide. The groove 62d extends in the direction of conveying the workpiece W (in the X-axis direction in Figure 6) and extends to both ends of the guide 62.

[0054] The lower part of the guide 62c has a wall portion 62e formed by a wall extending in the vertical direction (Z-axis direction in Figure 6). The wall portion 62e is a wall that constitutes the groove portion 62d and is formed by a wall located on the inside in the width direction of the workpiece W.

[0055] Through members W3 are inserted through both ends of the workpiece W. The through members W3 are conical in shape and are made of a metal material such as iron. However, the through members W3 may be pyramidal in shape or a screw, etc., instead of a cone. The through members W3 are attached to the workpiece W before the first punching process, which is performed when the workpiece W is transported to the second die. The tips of the through members W3 that protrude from the bottom surface of the workpiece W are positioned outside the wall portion 62e in the width direction of the workpiece W.

[0056] In Embodiment 3, even if the rise of the movable stripper 33 causes an upward pulling force to be applied to the center of the workpiece W in the width direction, the tip of the through member W3 is locked to the wall portion 62e, so the center of the workpiece W in the width direction is not pulled upward. In this way, vertical vibration of the workpiece W is suppressed in Embodiment 3. The wall portion 62e functions as a restricting part that restricts the upward pulling of the center of the workpiece W in the width direction.

[0057] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit.

[0058] For example, in the progressive press apparatus of this embodiment, a motor core member that will become the motor core for a motor is formed, but other members, such as gears or fuel cell separators, may also be formed. [Explanation of Symbols]

[0059] 1. Progressive die press 21...Second lower type 25, 52, 62... Guide 25e, 62e...Wall section 31...Second Upper Type 52d···Convex part W...work W1...Bending part W2...recess W3... Through-hole member

Claims

1. A progressive press machine that transports a sheet-shaped workpiece and punches out the workpiece, It has an upper mold located above the workpiece and a lower mold located below the workpiece. The lower die is provided with guides at both ends in the width direction of the workpiece, on which the workpiece is placed when punching it out. The guide is provided with a restricting portion that prevents the central part of the workpiece in the width direction from being pulled upward. Progressive die press machine.

2. At both ends of the workpiece in the width direction, a downwardly bent portion is formed. The regulating portion is a wall portion formed by a wall extending in the vertical direction, The bent portion of the workpiece is positioned on the outside of the wall portion in the width direction of the workpiece. The progressive press apparatus according to claim 1.

3. At both ends of the workpiece in the width direction, recesses are formed that are indented upward. The regulating portion is a protrusion formed by a projection, The recess of the workpiece is fitted into the protrusion. The progressive press apparatus according to claim 1.

4. The regulating portion is a wall portion formed by a wall extending in the vertical direction, Through members are inserted through both ends of the aforementioned workpiece. The tip of the through member protruding from the workpiece is positioned on the outside of the wall portion in the width direction of the workpiece. The progressive press apparatus according to claim 1.

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