Progressive die and processing method using progressive die

Abstract

[Problem] In a continuous die, it is possible to prevent the conveyance of a strip-shaped thin steel sheet from being obstructed by a lifter for lifting the strip-shaped thin steel sheet. [Solution] A progressive die (1) is provided with a plurality of stages (I-VII) for punching strip-shaped thin steel sheets (F), the plurality of stages (I-VII) include an outer shape punching stage (VI) for punching the outer shape (Db) of a thin sheet (W), and the outer shape punching stage (VI) includes an outer shape punching punch (24) and an outer shape punching die (46). One or more lifters (63-66) for lifting the strip-shaped thin steel sheet (F) from the surface of the outer shape punching die (46) are provided on the outer shape punching table and / or the table adjacent thereto. The length of at least one of the lifters (63-66) in the conveyance direction is greater than the length of the largest opening in the conveyance direction among a plurality of openings formed in the strip-shaped thin steel sheet (F) by punching by the outer punching table (VI) other than the outer punching table (VI).

Description

Technical Field

[0001] The present invention relates to a continuous die for punching out thin plate pieces from a strip-shaped thin steel plate that is intermittently conveyed, and a processing method using the continuous die. Background Art

[0002] In the past, a continuous die has been known as a manufacturing device for a laminated core for a motor core or the like. The continuous die is provided with a plurality of workbenches for sequentially performing necessary processing on a strip-shaped thin steel plate (strip steel material) composed of an electromagnetic steel plate. In each workbench, guide holes (holes for positioning), internal shapes (internal shapes of grooves, teeth, etc.), riveting parts, and adhesive coating are performed as required. Thus, the shapes of each thin plate piece constituting the laminated core are continuously formed in the strip-shaped thin steel plate conveyed in the continuous die. Finally, the thin plate piece whose outer shape is punched out from the strip-shaped thin steel plate is fixed in the continuous die in a state of stacking a specified number of pieces, thereby completing the laminated core. However, it is also possible to manufacture each thin plate piece in an independent state in the continuous die, and fix these thin plate pieces in a state of stacking a specified number of pieces outside the continuous die.

[0003] When conveying a strip of thin steel plate in a continuous die, the displacement (or deformation) of the strip of thin steel plate due to its own weight (gravity) must be properly controlled or adjusted to avoid interference with the peripheral part of the continuous die (i.e., unexpected abutment or friction, etc.).

[0004] On the other hand, when manufacturing a laminated core using a continuous die, it is preferable to further reduce the remaining material after punching out the thin plate pieces from the viewpoint of the yield rate of the raw materials. If the proportion of the portion corresponding to the thin plate pieces in the strip-shaped thin steel plate is increased in order to reduce the remaining material, the rigidity of the remaining material will be reduced, and displacement caused by the self-weight of the remaining material will be likely to occur (and thus interference with the peripheral portion of the continuous die will occur). In particular, as the thickness of the strip-shaped thin steel plate is reduced and the width of the strip-shaped thin steel plate is increased, such displacement caused by the self-weight is more likely to occur.

[0005] As a technology for stably conveying a strip of thin steel plate, for example, the following technology is known: in a continuous stamping device, there is: a lower die composed of a plurality of workbenches provided with punching holes arranged in parallel; and an upper die that moves up and down opposite to the lower die, and a plurality of lifters are provided around the punching holes of the lower die, and the lifters are used to raise the electromagnetic steel plate from the upper surface position of the lower die when conveying the electromagnetic steel plate (see patent document 1).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2003-200296 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, in the strip-shaped thin steel plate intermittently conveyed in the continuous die as described above, various openings (inner-shaped punching holes or outer-shaped punching holes, etc.) are sequentially formed on each worktable.

[0011] The inventors of the present application have conducted in-depth research and found that, for example, in a structure in which a strip of thin steel plate is lifted using a lifter provided on a continuous die, if the lifter engages (i.e., is stuck) with the periphery of an opening formed by processing the strip of thin steel plate, it may hinder the transportation of the strip of thin steel plate.

[0012] However, in the prior art described in Patent Document 1, it is not considered at all that the conveyance of the strip-shaped thin steel plate may be hindered by the lifter.

[0013] In view of the above background, an object of the present invention is to provide a continuous die capable of suppressing the conveyance of a strip-shaped thin steel plate from being hindered by a lifter for lifting the strip-shaped thin steel plate, and a processing method using the continuous die.

[0014] Means for solving problems

[0015] In order to solve the above-mentioned problems, one embodiment of the present invention is a continuous die, which is used to punch out thin plate pieces from a strip of thin steel plate intermittently conveyed along a specified conveying direction, wherein the continuous die is provided with a plurality of workbenches, and the plurality of workbenches respectively perform punching processing on the portions of the strip of thin steel plate corresponding to each of the thin plate pieces, the plurality of workbenches include a shape punching workbench for punching out the outer shape of the thin plate pieces, the shape punching workbench includes a shape punching punch and a shape punching die, and at least one of the shape punching workbench and the workbench adjacent thereto is provided with one or more lifters that lift the strip of thin steel plate from the surface of the shape punching die, at least one of the one or more lifters has a length in the conveying direction that is greater than the length of the maximum opening in the conveying direction, and the maximum opening is the largest opening among the plurality of openings formed on the strip of thin steel plate by the punching processing on the upstream side of the at least one lifter.

[0016] According to this method, the length of the lifter that lifts the strip of thin steel plate from the surface of the die for outer shape punching in the conveying direction is greater than the length of the largest opening in the strip of thin steel plate formed by the punching process on its upstream side in the conveying direction, thereby preventing the lifter for lifting the strip of thin steel plate from interfering with the conveying of the strip of thin steel plate.

[0017] In the above manner, preferably, the length of the at least one lifter in the conveying direction is greater than the conveying spacing of the strip-shaped thin steel plate.

[0018] According to this embodiment, since the length of the lifter in the conveying direction is greater than the conveying pitch, the lifter can always support the portion other than the opening on the strip-shaped thin steel plate, resulting in that shaking of the strip-shaped thin steel plate during conveyance can be suppressed.

[0019] In the above aspect, preferably, the at least one lifter is arranged on the downstream side of the outer shape punching die in the conveying direction, and the length of the lifter in the conveying direction is greater than the length of the opening of the outer shape punching die in the conveying direction.

[0020] According to this method, the length of the lifter arranged on the downstream side of the die for outer shape punching in the conveying direction is larger than the opening of the die for outer shape punching (i.e., equivalent to the opening formed in the strip-shaped thin steel plate by the punching process in the outer shape punching station), so it is possible to more effectively prevent the lifter arranged on the die for outer shape punching from interfering with the conveying of the strip-shaped thin steel plate.

[0021] In the above method, preferably, the multiple workbenches include an inner shape punching workbench, which punches the inner shape of the thin plate sheet on the upstream side of the outer shape punching workbench in the conveying direction, and the inner shape punching workbench includes an inner shape punch and an inner shape punching die, and the at least one lifter is arranged on the upstream side of the outer shape punching die in the conveying direction, and the length of the lifter in the conveying direction is greater than the length of the opening of the inner shape punching die in the conveying direction.

[0022] According to this method, the length of the lifter arranged on the upstream side of the die for outer shape punching in the conveying direction is greater than the opening of the die for inner shape punching (that is, equivalent to the opening formed in the strip-shaped thin steel plate by the punching process on the inner shape punching workbench), so the lifter can be more effectively prevented from interfering with the conveying of the strip-shaped thin steel plate.

[0023] In the above manner, preferably, the at least one elevator has a plurality of elevator segments divided into segments connected in the conveying direction.

[0024] According to this aspect, the length of the lifter in the conveying direction of the strip-shaped thin steel plate can be easily increased without affecting the operation of the lifter.

[0025] In the above-mentioned method, it is preferred that the at least one lifter is arranged on the downstream side of the punching die in the conveying direction, and regarding the lifting amount of the strip thin steel plate by each lifter segment, the lifter segment is located on the upstream side in the conveying direction, and the lifting amount is set higher.

[0026] According to this aspect, the strip-shaped thin steel plate after the punching process can be easily supported on the outer shape punching table by the lifter disposed on the downstream side of the outer shape punching die.

[0027] In the above method, it is preferred that the at least one lifter is arranged on the upstream side of the punching die in the conveying direction, and regarding the lifting amount of the strip thin steel plate by each lifter segment, the lifter segment is located on the downstream side in the conveying direction, and the lifting amount is set to be lower.

[0028] According to this aspect, the strip-shaped thin steel plate before being punched in the outer shape punching station can be smoothly moved toward the outer shape punching die side.

[0029] In the above aspect, preferably, the at least one lifter includes two or more lifters arranged at intervals in a direction perpendicular to the conveying direction.

[0030] According to this aspect, it is possible to suppress the conveyance of the strip-shaped thin steel plate from being hindered by the lifter, and to stably avoid interference between the strip-shaped thin steel plate and the outer shape punching die.

[0031] In the above scheme, it is preferred that, among the two lifters, the one that lifts the portion closer to the center of the outer shape punching die in a direction perpendicular to the conveying direction lifts the strip-shaped thin steel plate more than the other lifter lifts the strip-shaped thin steel plate.

[0032] According to this aspect, the amount of lift of the strip-shaped thin steel plate relative to the surface of the outer shape punching die is increased, and interference between the strip-shaped thin steel plate and the outer shape punching die can be more effectively avoided.

[0033] In the above aspect, it is preferable that the plurality of work tables are provided for two production lines respectively, and the two production lines are set to be arranged in parallel in the width direction of the strip-shaped thin steel plate.

[0034] According to this aspect, the efficiency of punching out thin plate pieces from one strip-shaped thin steel plate can be improved, and the lifting device for lifting the strip-shaped thin steel plate can be prevented from interfering with the conveyance of the strip-shaped thin steel plate.

[0035] In order to solve the above-mentioned problems, one embodiment of the present invention is a processing method using a continuous die, wherein the continuous die is used to punch out thin plate pieces from a strip-shaped thin steel plate that is intermittently conveyed along a specified conveying direction, wherein the continuous die is provided with a plurality of workbenches, and the plurality of workbenches respectively perform punching processing on the portions of the strip-shaped thin steel plate corresponding to each of the thin plate pieces, and the plurality of workbenches include an outer shape punching workbench for punching out the outer shape of the thin plate pieces, and in the outer shape punching workbench, when the strip-shaped thin steel plate is not conveyed, the strip-shaped thin steel plate is punched out using an outer shape punching punch and an outer shape punching die, and when the strip-shaped thin steel plate is conveyed, the strip-shaped thin steel plate is lifted from the surface of the outer shape punching die using one or more lifters provided on at least one of the outer shape punching workbench and an adjacent workbench, and the length of at least one of the one or more lifters in the conveying direction is greater than the length of the maximum opening in the conveying direction, and the maximum opening is the largest opening among the plurality of openings formed on the strip-shaped thin steel plate by the punching processing on the upstream side of the at least one lifter.

[0036] According to this method, the length of the lifter that lifts the strip of thin steel plate from the surface of the die for outer shape punching in the conveying direction is greater than the length of the largest opening in the strip of thin steel plate formed by the punching process on its upstream side in the conveying direction, thereby preventing the lifter for lifting the strip of thin steel plate from interfering with the conveying of the strip of thin steel plate.

[0037] Effects of the Invention

[0038] According to the above aspect, it is possible to suppress the lifter for lifting the strip-shaped thin steel plate from interfering with the conveyance of the strip-shaped thin steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the continuous mold 1 according to the embodiment.

[0040] Figure 2 It means by Figure 1 The schematic strip blank layout of the processing of the strip steel material F by the continuous die 1 shown.

[0041] Figure 3 It is a top view of the lower die 4 showing the peripheries of the inner shape punching station IV and the outer shape punching station VI.

[0042] Figure 4 This is an enlarged view of the main parts around the outer shape punching table VI (equivalent to the Figure 3 The cross section of line IV-IV in Fig.

[0043] Figure 5 is along Figure 3A cross-sectional view taken along the line VV in FIG. 1 ((A) shows the conveyance of the strip steel material F, and (B) shows the punching of the strip steel material F).

[0044] Figure 6 is along Figure 3 A cross-sectional view taken along line VI-VI in FIG. 1 ((A) shows the conveyance of the strip steel material F, and (B) shows the punching of the strip steel material F).

[0045] Figure 7 Yes means Figure 5 FIG. 6 is a diagram showing a modified example of the lifter 63 shown.

[0046] Figure 8 Yes means Figure 6 FIG. 6 is a diagram showing a modified example of the lifter 65 shown. DETAILED DESCRIPTION

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, for the convenience of description, directions are specified by the up and down, front and back, left and right arrows shown in the respective figures. However, the continuous die involved in the present invention and the processing method using the continuous die are not necessarily limited to these directions. In addition, in the following description, the terms "upstream" and "downstream" respectively represent the upstream (i.e., the starting point side of the conveying) and downstream (i.e., the end point side of the conveying) of the strip steel material in the continuous die.

[0048] like Figure 1 As shown, the continuous die 1 is a device for manufacturing a laminated core M by processing a strip steel material F (strip-shaped thin steel plate) composed of electromagnetic steel sheets. The laminated core M is formed by laminating a predetermined number of thin plate pieces W. The laminated core M is used for a stator of a motor, for example.

[0049] In addition, in the continuous die 1, one side is in a predetermined conveying direction ( Figure 1 The strip steel material F is intermittently conveyed in the forward conveying direction (in the forward conveying direction indicated by the arrow in the figure), and the portions corresponding to the thin plate pieces W are sequentially punched. The details will be described later. In the continuous die 1, a plurality of workbenches I-VII are provided along the conveying direction of the strip steel material F. In the workbenches II, IV and VI, the portions of the strip steel material F corresponding to the thin plate pieces W are punched.

[0050] The continuous die 1 may also be provided with a workbench for providing a rivet portion (rivet protrusions and recesses or holes for embedding the rivet protrusions) for integrating the upper and lower overlapping thin plate pieces W. In addition, the processing of the strip steel material F by the continuous die 1 is not limited to the blanking processing using a punch and a die, and may include, for example, processing that does not change the shape of the strip steel material F (or the portion corresponding to each thin plate piece W) (for example, application of an adhesive for integrating the upper and lower overlapping thin plate pieces W).

[0051] In this embodiment, if Figure 2 As shown, a plurality of workstations I-VII are provided for the first and second production lines 100 and 200 which are set to be arranged in parallel in the width direction (left-right direction) of the strip steel material F. That is, in the continuous die 1, the strip steel material F is processed in the same manner in the first and second production lines 100 and 200 to form thin plate pieces W of the same shape. In addition, the portion corresponding to each thin plate piece W corresponds to the portion of the strip steel material F from which each thin plate piece W is punched out later. The continuous die 1 may also be a structure having only one production line (for example, the first production line 100).

[0052] Refer again Figure 1 The continuous die 1 includes an upper die 3 and a lower die 4, and the upper die 3 and the lower die 4 are configured to clamp a strip steel material F composed of electromagnetic steel sheets from top to bottom.

[0053] The upper die 3 has a plate-shaped upper bracket 12 fixed to the lower surface of the upper ram (not shown) of the punching machine. As a result, the upper die 3 can move in the up-down direction in a manner close to and away from the lower die 4. In the upper die 3, a lining plate 16 and a clamping plate 18 are installed at the lower part of the upper bracket 12. The clamping plate 18 fixes the punch 20 for punching the guide hole, the punch 21 for punching the groove, the punch 22 for punching the inner shape, and the punch 24 for punching the outer shape to the upper bracket 12, respectively. The lining plate 16 prevents the processing force of each punch 20, punch 21, punch 22, and punch 24 from being directly applied to the upper bracket 12.

[0054] In the upper mold 3, a stripper 28 is installed below the upper bracket 12. The stripper 28 can be relatively displaced in the up-down direction relative to the upper bracket 12. The stripper 28 is suspended by a suspension bolt (not shown) to set the maximum descending position relative to the upper bracket 12. The stripper 28 is configured as a joint body of a stripper body 30 and a stripper plate 32, each of which is in the shape of a plate.

[0055] The lower surface 33 of the stripper plate 32 is opposite to the upper surfaces of the punch plate 40 and the dies 42, 43, 44, 46 described later. In other words, the stripper plate 32 has a lower surface 33 parallel to the upper surfaces of the punch plate 40 and the dies 42, 43, 44, 46. The stripper plate 32 is formed with punch insertion holes 34, 35, 36, 38 through which the punches 20, 21, 22, 24 pass.

[0056] The lower die 4 has a plate-shaped lower bracket 14 fixed to the upper surface of the lower worktable (not shown) of the punching machine. The lower bracket 14 is arranged in a manner opposite to the upper bracket 12. In the lower die 4, a plate-shaped punching plate 40 is installed on the upper surface of the lower bracket 14. On the punching plate 40, a guide hole punching die 42, a groove punching die 43, an inner shape punching die 44, and an outer shape punching die 46 are respectively installed at positions corresponding to the punching worktables I, II, IV, and VI.

[0057] In addition, the upper surfaces of the punch plate 40 and the respective punch dies 42 , 43 , 44 , 46 are coplanar, and therefore, their upper surfaces are collectively referred to as an upper surface 47 of the lower die 4 hereinafter.

[0058] like Figure 2 As shown, the plurality of workstations I-VII include a guide hole punching workstation I, a slot punching workstation II, an empty workstation III, an inner shape punching workstation IV, empty workstations Va, Vb, an outer shape punching workstation VI and an empty workstation VII. In the continuous die 1, each workstation I-VII is arranged at a predetermined interval in the forward direction (transport direction).

[0059] In the guide hole punching station I, the slot punching station II, the inner shape punching station IV, and the outer shape punching station VI, the punching process of the guide hole P for positioning, the punching process of the slot S, the punching process of the inner shape Da of the thin plate piece W, and the punching process of the outer shape Db of the thin plate piece W are respectively performed. In the empty stations III, Va, Vb, and VII, the strip steel material F is fed empty. However, the empty station Vb is set only on the production line 200 side.

[0060] In the guide hole punching work station I, the guide hole punching punch 20 and the guide hole punching die 42 constitute a pair of tools for punching the guide holes P. Each guide hole P is arranged near the left and right side edges of the strip steel material F. In the strip steel material F, a circular guide hole P is punched out every time a punching action is performed (that is, every time the strip steel material F is intermittently transferred).

[0061] In the slot punching station II, the slot punching punch 21 and the slot punching die 43 constitute a pair of tools for punching out the slots S formed in the thin plate piece W. The slots S are arranged at predetermined intervals in the circumferential direction and correspond to the areas between the plurality of teeth formed on the thin plate piece W. The slot punching punch 21 and the slot punching die 43 are provided corresponding to the respective slots S. The slots S are punched out in the strip steel material F each time a punching action is performed.

[0062] In the inner shape punching workbench IV, the inner shape punching punch 22 and the inner shape punching die 44 constitute a pair of tools for punching out the inner shape Da of the thin plate piece W. The inner shape punching die 44 is substantially annular. An opening 44A (see FIG. 4A ) is formed in the inner shape punching die 44 for inserting the inner shape punch 22. Figure 3 ). On the strip steel material F, a circular inner shape Da (including the inner edge portion defining a plurality of teeth) is punched out each time a punching action is performed.

[0063] In the outer shape punching workbench VI, the outer shape punching punch 24 and the outer shape punching die 46 constitute a pair of tools for punching out the outer shape of the thin plate piece W. The outer shape punching die 46 is substantially annular. An opening 46A (see FIG. 1 ) is formed in the outer shape punching die 46 for inserting the outer shape punch 24. Figure 3 ). In addition, as described in detail later, lifters 63-66 for lifting the strip steel material F are provided around the outer shape punching workbench VI (refer to Figure 3 The lifters 63-66 can be arranged on at least one of the outer shape punching worktable VI and the worktable adjacent thereto. Each time a punching action is performed, an outer shape is punched out on the strip steel material F. The thin plate W is completed by punching out the outer shape (i.e., the processing of the strip steel material F is completed).

[0064] In the outer shape punching workbench VI, when the upper die 3 descends at the start of the outer shape punching of the thin plate W, the stripper plate 32 descends together with the upper die 3. At this time, the strip steel material F is in a substantially stopped state when not being conveyed (strictly speaking, including the case of not being stopped). The descending stripper plate 32 presses the upper surface of the strip steel material F downward through its lower surface 33. At this time, the strip steel material F is clamped between the lower surface 33 of the stripper plate 32 and the upper surface 47 of the lower die 4.

[0065] When the upper die 3 rises after the punching of the outer shape of the thin plate W is completed, the stripper plate 32 rises together with the upper die 3. As a result, the pressing of the stripper plate 32 on the strip steel material F is released, and the strip steel material F is separated from the upper surface 47 of the lower die 4. In this state, the strip steel material F is transported in the forward direction by a predetermined amount.

[0066] In addition, the action of the stripper plate 32 is the same in other workstations IV and VII.

[0067] As described in detail later, a structure for guiding the conveyance of the steel strip F during conveyance (hereinafter referred to as a guiding structure) and a structure for lifting the steel strip F during conveyance of the steel strip F (hereinafter referred to as a lifting structure) are provided on the contour punching workbench VI. In the continuous die 1, the guiding structure can be used to suppress excessive displacement of the steel strip F in the width direction. Moreover, in the continuous die 1, the lifting structure can control or adjust the displacement of the steel strip F due to its own weight (i.e., the separation distance from the upper surface 47 of the lower die 4) regardless of how the rigidity of the steel strip F decreases. As a result, interference between the steel strip F and the peripheral portion of the continuous die 1 (i.e., accidental abutment or friction, etc.) can be suppressed, and the steel strip F can be stably conveyed.

[0068] Each thin plate piece W punched out is pressed into the die 46 by the punch 24 and sequentially stacked on the previously punched thin plate piece W. The plurality of thin plate pieces W stacked in the die 46 are integrated between the thin plate pieces stacked up and down by connection based on rivets or bonding based on adhesives.

[0069] In addition, the thin plate piece W punched out with an outer shape can also be stacked on the previously punched out thin plate piece W after rotating a specified angle (for example, 90°). In addition, an extrusion ring having an inner diameter slightly smaller than the inner diameter of the die 46 can be provided below the die 46 in the lower die 4. The extrusion ring applies a specified lateral pressure to the stacked thin plate pieces W moving downward. Furthermore, the continuous die 1 can also manufacture each thin plate piece W in a state where each thin plate piece W is independent (that is, in a state where they are not fixed to each other). In this case, the manufactured thin plate pieces W are fixed (for example, welded) outside the continuous die 1 in a state where a specified number of pieces are stacked.

[0070] In the outer shape punching station VI, a predetermined number of thin plate pieces W fixed to each other in a stacked state are taken out as a laminated core M from the lower portion of the discharge hole 48 formed in the lower holder 14 .

[0071] Next, the guide structure and the lifting structure of the outer shape punching table VI will be described.

[0072] like Figure 3 and Figure 4 As shown, in the lower die 4, a plurality of left guides 61A-61F for guiding the left edge of the strip steel material F and right guides 62A-62E for guiding the right edge of the strip steel material F are provided around the inner shape punching station IV and the outer shape punching station VI.

[0073] The left guides 61A-61F are arranged at predetermined intervals along the left edge of the lower die 4. The right guides 62A-62E are arranged at predetermined intervals along the right edge of the lower die 4. The left guides 61A-61F and the right guides 62A-62E are respectively fixed to the upper surface 47 of the lower die 4 (the upper surface of the die plate 40). The left guides 61A-61F and the right guides 62A-62E respectively have a longitudinal wall and a horizontal wall (for example, see Figure 5 The horizontal walls 110, 111 shown in the figure are erected from the upper surface 47 of the lower mold 4 and have a surface opposite to the side edge of the strip steel F. The horizontal wall extends horizontally from the upper part of the vertical wall toward the center of the lower mold 4 in the left-right direction.

[0074] The structure (number, position, shape, etc.) of the left side guides 61A-61F can be changed appropriately. The same is true for the right side guides 62A-62E. In addition, similar side guides can be provided on other workstations except the inner punching workstation IV and the outer punching workstation VI.

[0075] like Figure 3 As shown, on the first line 100 side of the lower die 4, lifters 63 and 64 are provided on the downstream side of the outer shape punching die 46.

[0076] The lifter 63 extends in the front-to-back direction (transport direction) when viewed from above. The center of the lifter 63 is arranged at a position substantially overlapping with the center C of the corresponding outer shape punching die 46 in the left-right direction (direction perpendicular to the transport direction). The length L1 of the lifter 63 in the front-to-back direction is set to be greater than the length G1 of the opening of the corresponding outer shape punching die 46 (i.e., on the first production line 100 side) in the front-to-back direction. In other words, the length L1 of the lifter 63 is set to be greater than the length (here, the length G1) of the largest opening in the front-to-back direction among the multiple openings formed in the strip steel material F on its upstream side.

[0077] Thus, even if the opening formed in the strip steel material F overlaps the lifter 63 during the conveyance of the strip steel material F, the lifter 63 will not be inserted into the opening. It is possible to avoid the lifter 63 from engaging (i.e., hooking) with the periphery of the opening formed in the strip steel material F by punching the outer shape Db. As a result, it is possible to prevent the lifter 63 for lifting the strip steel material F on the downstream side of the outer shape punching die 46 from interfering with the conveyance of the strip steel material F. In addition, in the present embodiment, the length G1 is set to be the same as the inner diameter of the outer shape punching die 46.

[0078] In the present embodiment, the length G1 of the opening of the outer shape punching die 46 is substantially the same as the conveying pitch X of the strip steel material F. However, when the conveying pitch X is greater than the length G1, the length L1 of the lifter 63 may be set to be greater than the conveying pitch X of the strip steel material F. Thus, the shaking of the strip steel material F during conveyance can be suppressed.

[0079] like Figure 5 As shown, a lifter 63 has a lifter body 71 that is arranged on the lower mold 4 in a manner that can be retracted (protruded and retracted). The lifter body 71 has a form that is divided into multiple parts in the front-to-back direction. In this embodiment, the lifter body 71 has four lifter segments 72-75 connected in the front-to-back direction. In the lifter segments 72-75, the side surfaces of the adjacent lifter segments in the front-to-back direction are in a state of sliding contact with each other. For example, the front surface 72A (the surface on the downstream side) of the lifter segment 72 and the rear surface 73A (the surface on the upstream side) of the lifter segment 73 are in sliding contact with each other. The lifter segments 72-75 are accommodated in a lifter hole 77 that opens on the upper surface 47 of the lower mold 4. Here, the lifter hole 77 is concave. The lifter hole 77 passes through the punching plate 40 from the upper surface 47 of the lower mold 4 and extends to the lower bracket 14. Each of the lifter segments 72 to 75 is movable in the lifter hole 77 between a raised position (an advanced position in which the lifter segments 72 to 75 are advanced upward) and a lowered position (a retreated position in which the lifter segments 72 to 75 are retreated downward).

[0080] In this way, the lifter body 71 is composed of a plurality of lifter segments 72 to 75 divided in the conveying direction, so that the length of the lifter 63 in the conveying direction of the strip steel material F can be easily increased without affecting the operation of the lifter 63 .

[0081] The upper portion of the lifter segment 72 has an upper surface 72B extending substantially parallel to the upper surface 47 of the lower die 4. The upper portion of the lifter segment 72 pushes the lower surface of the strip steel material F by the force of the two lifter springs 79. An inclined portion 72C is formed on the rear side of the upper portion of the lifter segment 72 by chamfering the corners. This prevents the upper portion of the rear side (upstream side) of the lifter body 71 from engaging with the peripheral edge of the opening formed on the strip steel material F. As a result, it is possible to prevent the lifter 63 from obstructing the smooth movement of the strip steel material F in the conveying direction.

[0082] Each lifter spring 79 is accommodated in a spring accommodation hole 80 formed in the lower die 4 (here, the lower bracket 14). Each lifter spring 79 is connected to the lifter segment 72 via a connecting member 101, respectively.

[0083] The lifter segments 73-75 have substantially the same structure as the lifter segment 72, and therefore detailed description thereof is omitted. However, no inclined portion is formed on the upper surface of the lifter segments 73 and 74 located in the middle of the lifter body 71. In addition, an inclined portion 75C is formed on the front side of the upper surface of the lifter segment 75 by chamfering the corner portion. This prevents the upper portion of the front side (downstream side) of the lifter body 71 from engaging with the peripheral edge of the opening formed on the strip steel material F. As a result, it is possible to prevent the lifter 63 from obstructing the smooth movement of the strip steel material F in the conveying direction.

[0084] like Figure 5 As shown in (A), when the strip steel material F is conveyed, the pressure of the strip steel material F by the stripping plate 32 is released. Therefore, around the outer shape punching worktable VI, the strip steel material F is lifted upward by the upper part of the lifter body 71 (i.e., the lifter segments 72-75 respectively urged by the corresponding lifter springs 79).

[0085] When conveying the steel material F, the other lifter segments 73 to 75 operate in the same manner as the lifter segment 72. The other lifter segments 73 to 75 are also located below the horizontal wall of the corresponding left guide at their respective raised positions.

[0086] In this way, the strip steel material F is lifted from the upper surface 47 of the lower die 4 by the lifter body 71 during transportation, so that interference between the strip steel material F and the peripheral portion of the continuous die 1 (here, the outer shape punching die 46 of the lower die 4) can be avoided. Therefore, the strip steel material F after the thin plate piece W is punched out can be stably transported in the continuous die 1. In particular, as described above, by setting the length L1 of the lifter 63 to be larger than the length G1 of the opening of the outer shape punching die 46 in the front-rear direction, it is possible to suppress the lifter 63 from interfering with the transportation of the strip steel material F.

[0087] like Figure 5 As shown in (B), when the strip steel material F is punched (not during transportation), its upper surface is pressed downward by the lower surface 33 of the strip plate 32. As a result, the lower surface of the strip steel material F is in contact with the upper surface 47 of the lower die 4. For example, the lifter segment 72 is pressed downward by the lower surface of the strip steel material F with a force that overcomes the action of the two lifter springs 79. As a result, the lifter segment 72 retreats into the lifter hole 77 (i.e., moves to the retreat position). When the strip steel material F is punched, the other lifter segments 73-75 act in the same manner as the lifter segment 72.

[0088] Refer again Figure 3, the lifter 64 extends substantially parallel to the lifter 63 when viewed from above. The lifter 64 is arranged on the left side of the lifter 63. Similar to the lifter 63, the length L2 of the lifter 64 is set to be larger than the length G1 of the opening of the corresponding outer shape punching die 46 in the front-to-back direction. In the case where the conveying pitch X is larger than the length G1, the length L2 of the lifter 64 can be set to be larger than the conveying pitch X. In addition, the length L1 of the lifter 63 located on the center C side of the outer shape punching die 46 in the width direction of the strip steel material F is set to be smaller than the length L2 of the lifter 64 located farther from the center C of the outer shape punching die 46.

[0089] In addition, the rising position of the lifter body in the lifter 63 located on the center C side of the outer shape punching die 46 in the width direction of the strip steel material F (i.e., the lifting amount of the strip steel material F) can be set larger (higher) than the rising position of the lifter body 71 in the lifter 64 farther from the center C of the outer shape punching die 46. As a result, the lifting amount of the strip steel material F relative to the surface of the outer shape punching die 46 is increased, and interference between the strip steel material F and the outer shape punching die 46 can be more effectively avoided.

[0090] In addition, the action of the lifter 64 during the conveyance of the strip steel material F and during the punching of the strip steel material F is the same as the action of the lifter 63 described above. In addition, in the present embodiment, an example in which two lifters 63 and lifter 64 are provided on the downstream side of the outer shape punching die 46 is shown, but one of them may be omitted. Moreover, by setting the length of at least one lifter in the conveyance direction to be greater than the length G1 of the opening of the outer shape punching die 46 in the front-to-back direction, the effect of suppressing the lifter from obstructing the conveyance of the strip steel material F can be obtained. Such a lifter may be provided on at least one of the outer shape punching worktable VI and the worktable adjacent thereto. For example, when a plurality of lifters other than the lifters 63 and 64 are provided on the downstream side of the outer shape punching die 46, the length of some of these lifters in the conveyance direction may also be set to be less than the length G1 of the opening of the outer shape punching die 46 in the front-to-back direction. In this case, for the lifter whose length in the conveyance direction is set to be less than G1, the same or smaller advance amount (rising position) as that of the lifters 63 and 64 may be set.

[0091] On the other hand, on the second line 200 side of the lower die 4 , a lifter 65 and a lifter 66 are provided on the upstream side of the outer shape punching die 46 .

[0092] The lifter 65 extends in the front-to-back direction when viewed from above. The lifter 65 is arranged at a position overlapping with the center C of the corresponding outer-shaped punching die 46 in the left-right direction (direction perpendicular to the conveying direction). The length L3 of the lifter 65 in the front-to-back direction is set to be greater than the length G2 of the opening of the corresponding inner-shaped punching die 44 (i.e., on the second production line 200 side) in the front-to-back direction. In other words, the length L3 of the lifter 65 is set to be greater than the length (here, the length G2) of the largest opening in the front-to-back direction among the multiple openings formed in the strip steel material F on its upstream side.

[0093] Thus, even if the opening formed in the strip steel material F overlaps on the lifter 65 when the strip steel material F is conveyed, the lifter 65 will not be inserted into the opening. It is possible to avoid the lifter 65 from engaging with the periphery of the opening formed in the strip steel material F by punching the inner shape Da. As a result, it is possible to suppress the lifter 65 for lifting the strip steel material F on the upstream side of the outer shape punching die 46 from obstructing the conveying of the strip steel material F. In addition, in the present embodiment, the length G2 is set to be the same as the inner diameter of the inner shape punching die 44. In addition, the length L3 of the lifter 65 is more preferably set to be larger than the conveying pitch X of the strip steel material F.

[0094] like Figure 6 As shown, a lifter 65 has a lifter body 81 that is arranged on the lower mold 4 in a manner that allows it to appear and disappear. The lifter body 81 has a form that is divided into multiple parts in the front-to-back direction. Here, the lifter body 81 has three lifter segments 82-84 connected in the front-to-back direction. In the lifter segments 82-84, the side surfaces of adjacent lifter segments in the front-to-back direction are in a state of sliding contact with each other. For example, the front surface 82A (the surface on the downstream side) of the lifter segment 82 and the rear surface 83A (the surface on the upstream side) of the lifter segment 83 are in sliding contact with each other. The lifter segments 82-84 are accommodated in a lifter hole 87 that opens on the upper surface 47 of the lower mold 4. Here, the lifter hole 87 is concave. The lifter hole 87 passes through the punching plate 40 from the upper surface 47 of the lower mold 4 and extends to the lower bracket 14. Each of the lifter segments 82 to 84 is movable in the lifter hole 87 between a raised position (an advanced position in which the lifter segments 82 to 84 are advanced upward) and a lowered position (a retreated position in which the lifter segments 82 to 84 are retreated downward).

[0095] In this way, the lifter body 81 is composed of a plurality of lifter segments 82 to 84 divided in the conveying direction, so the length of the lifter 65 in the conveying direction of the strip steel material F can be easily increased without affecting the operation of the lifter 65 .

[0096] The upper portion of the lifter segment 82 has a horizontal surface 82B extending substantially parallel to the upper surface 47 of the lower die 4. The upper portion of the lifter segment 82 pushes the lower surface of the strip steel material F by the force of the two lifter springs 89. An inclined portion 82C is formed on the rear side of the upper surface of the lifter segment 82 by chamfering the corners. This prevents the upper portion of the rear side (upstream side) of the lifter body 81 from engaging with the peripheral edge of the opening formed on the strip steel material F. As a result, it is possible to prevent the lifter 65 from obstructing the smooth movement of the strip steel material F in the conveying direction.

[0097] Each lifter spring 89 is housed in a spring housing hole 90 formed in the lower die 4 (here, the lower bracket 14). Each lifter spring 89 is connected to the lifter segment 82 via a connecting member 201, respectively.

[0098] The lifter segments 83 and 84 have the same structure as the lifter segment 82, so their detailed description is omitted. However, no inclined portion is formed on the upper surface of the lifter segment 83 located in the middle of the lifter body 81. In addition, an inclined portion 84C is formed on the front side of the upper surface of the lifter segment 84 by chamfering the corner portion. This prevents the upper portion of the front side (downstream side) of the lifter body 81 from being engaged with the peripheral edge of the opening formed on the strip steel material F. As a result, it is possible to prevent the lifter 65 from obstructing the smooth movement of the strip steel material F in the conveying direction.

[0099] like Figure 6 As shown in (A), when the strip steel material F is conveyed, the pressure of the strip steel material F by the stripping plate 32 is released. Therefore, around the outer shape punching worktable VI, the strip steel material F is lifted upward by the upper part of the lifter body 81 (i.e., the lifter segments 82-84 respectively urged by the corresponding lifter springs 89).

[0100] At this time, for example, the upper portion of the elevator segment 82 is located below the corresponding right side guide 62C in its raised position. More specifically, the horizontal surface 82B (horizontal portion) of the elevator segment 82 is located below the lower surface of the horizontal wall 210 of the right side guide 62C.

[0101] When conveying the belt steel material F, the other lifter segments 83 and 84 operate in the same manner as the lifter segment 82. The other lifter segments 83 and 84 are also located below the horizontal wall of the corresponding right guide at their respective raised positions.

[0102] In this way, the strip steel material F is lifted from the upper surface 47 of the lower die 4 by the lifter body 81 during transportation, so that interference between the strip steel material F and the peripheral portion of the continuous die 1 (here, the outer shape punching die 46 of the lower die 4) during transportation can be avoided. Therefore, the strip steel material F after the thin plate piece W is punched out can be stably transported in the continuous die 1. In particular, by setting the length L3 of the lifter 65 to be larger than the length G2 of the opening of the inner shape punching die 44 in the front-rear direction, it is possible to suppress the lifter 65 from interfering with the transportation of the strip steel material F.

[0103] like Figure 6 As shown in (B), when the strip steel material F is punched (not during transportation), its upper surface is pressed downward by the lower surface 33 of the strip plate 32. As a result, the lower surface of the strip steel material F is in contact with the upper surface 47 of the lower die 4. In addition, for example, the lifter segment 82 is pressed downward by the lower surface of the strip steel material F with a force that overcomes the action of the two lifter springs 89. As a result, the lifter segment 82 retreats into the lifter hole 87 (i.e., moves to the retreat position). When the strip steel material F is punched, the other lifter segments 83 and 84 operate in the same manner as the lifter segment 82.

[0104] Refer again Figure 3 , the lifter 66 extends substantially parallel to the lifter 65 in a plan view. The lifter 66 is arranged on the right side of the lifter 65. Similar to the lifter 65, the length L4 of the lifter 66 is set to be larger than the length G2 of the opening of the corresponding inner-shaped punching die 44. However, the length L4 of the lifter 66 is more preferably set to be larger than the conveying pitch X of the strip steel material F. In addition, the length L3 of the lifter 65 located on the center C side of the outer-shaped punching die 46 in the width direction of the strip steel material F is set to be larger than the length L4 of the lifter 66 farther from the center C of the outer-shaped punching die 46.

[0105] In addition, the rising position of the lifter body 81 of the lifter 65 located on the center C side of the outer shape punching die 46 in the width direction of the strip steel material F (i.e., the lifting amount of the strip steel material F) can be set to be larger (higher) than the rising position of the lifter body 81 of the lifter 66 farther from the center C of the outer shape punching die 46. As a result, the lifting amount of the strip steel material F relative to the surface of the outer shape punching die 46 is increased, and interference between the strip steel material F and the outer shape punching die 46 can be more effectively avoided.

[0106] In addition, the action of the lifter 66 during the conveyance of the strip steel material F and during the punching of the strip steel material F is the same as the action of the lifter 65 described above. In addition, in the present embodiment, an example in which two lifters 65 and lifters 66 are provided on the upstream side of the outer shape punching die 46 is shown, but one of them may be omitted. Moreover, by setting the length of at least one lifter in the conveyance direction to be greater than the length G2 of the opening of the inner shape punching die 44 in the front-to-back direction, the effect of suppressing the lifter from obstructing the conveyance of the strip steel material F can be obtained. Such a lifter may be provided on at least one of the outer shape punching workstation VI and the workstation adjacent thereto. For example, in the case where a plurality of lifters other than the lifter 65 and lifter 66 are provided on the upstream side of the outer shape punching die 46, the length of a part of these lifters in the conveyance direction may also be set to be less than the length G2 of the opening of the inner shape punching die 44 in the front-to-back direction.

[0107] Next, a modification of the lifter 63 provided on the downstream side of the outer shape punching die 46 will be described.

[0108] like Figure 7 As shown, in the lifter 63, it is preferable that the lifting amount of the strip steel material F by the lifter sections 72-75 is set to be higher as the lifter section is located on the upstream side in the conveying direction.

[0109] Here, the upper surface of the lifter body 71 is formed as an inclined surface, which is inclined upward toward the upstream side of the conveying direction with reference to the imaginary line H indicating the horizontal direction (i.e., the direction along the upper surface 47 of the lower mold 4). The upper parts of the lifter segments 72-75 respectively have inclined upper surfaces 72B-75B constituting the upper surface of the lifter body 71. In addition, the ends of the upper surfaces 72B-75B adjacent to each other are smoothly connected to each other (at the same height) in a manner that does not generate steps.

[0110] The present invention is not limited to this, and the upper parts of the lifter segments 72 to 75 may each have a horizontal surface. In this case, the advance amount (or rising position) of the lifter segments 72 to 75 from the upper surface 47 of the lower mold 4 is set to become smaller (or lower) in the order of the lifter segments 72, 73, 74, and 75.

[0111] In addition, the lifting amount of the strip steel material F by the lifter segments constituting the lifter 64 can also be changed in the same manner as the lifter 63 .

[0112] In this way, regarding the lifting amount of the strip steel F by the lifter sections 72-75, the lifter section located on the upstream side in the conveying direction is set to have a higher lifting amount. Therefore, the lifter 63 arranged on the downstream side of the outer shape punching die 46 can be used to easily support the strip steel F that has been punched on the outer shape punching workbench VI.

[0113] Next, a modification of the lifter 65 provided on the upstream side of the outer shape punching die 46 will be described.

[0114] like Figure 8 As shown, in the lifter 65, it is preferable that the lifting amount of the strip steel material F by the lifter sections 82-84 is set higher as the lifter section is located on the downstream side in the conveying direction.

[0115] Here, the upper surface of the lifter body 81 is formed as an inclined surface, which is inclined upward toward the downstream side of the conveying direction with reference to the imaginary line H representing the horizontal direction (i.e., the direction along the upper surface 47 of the lower mold 4). The upper parts of the lifter segments 82-84 respectively have inclined upper surfaces 82B-84B constituting the upper surface of the lifter body 81. In addition, the ends of the upper surfaces 82B-84B adjacent to each other are smoothly connected to each other (at the same height) in a manner that does not generate steps.

[0116] The present invention is not limited to this, and the upper parts of the lifter segments 82 to 84 may each have a horizontal surface. In this case, the advance amount (or rise amount) of the lifter segments 82 to 84 from the upper surface 47 of the lower mold 4 is set to be larger (or higher) in the order of the lifter segments 82, 83, and 84.

[0117] In addition, the lifting amount of the strip steel material F by the lifter segments constituting the lifter 66 can also be changed in the same manner as the lifter 65 .

[0118] In this way, regarding the lifting amount of the strip steel material F by the lifter sections 82-84, the lifter sections located on the downstream side in the conveying direction are set to have a higher lifting amount, so that the strip steel material F being punched on the outer shape punching workbench VI can be smoothly moved toward the side of the outer shape punching die 46.

[0119] The present invention has been described above based on specific embodiments, but these embodiments are merely illustrative and the present invention is not limited to these embodiments. Not all of the components of the continuous die and the processing method using the continuous die of the present invention shown in the above embodiments are necessary, and they can be appropriately selected as long as they do not deviate from the scope of the present invention.

[0120] For example, a part of the plurality of worktables provided in the continuous die 1 shown in the embodiment may be omitted, or another worktable may be newly added. In addition, the shape of the thin plate piece W is not limited to the shape shown in the embodiment, and various changes can be made.

[0121] In addition, on the first production line 100 side, a lifter similar to the lifters 65 and 66 may be further provided on the upstream side of the outer shape punching die 46. Alternatively, on the second production line 200 side, a lifter similar to the lifters 63 and 64 may be further provided on the downstream side of the outer shape punching die 46.

[0122] Description of symbols

[0123] 1: Continuous mode;

[0124] 3: Upper mold;

[0125] 4: Lower die;

[0126] 12: upper side bracket;

[0127] 14: lower side bracket;

[0128] 16: Liner;

[0129] 18: Splint;

[0130] 20: Punch for cutting the guide hole;

[0131] 21: Punch for slot punching;

[0132] 22: Punch for internal blanking;

[0133] 24: Punch for blanking;

[0134] 28: stripper;

[0135] 30: stripper body;

[0136] 32: stripping plate;

[0137] 33: lower surface;

[0138] 34: Punch through the hole;

[0139] 35: Punch through the hole;

[0140] 36: Punch through the hole;

[0141] 38: Punch through the hole;

[0142] 40: Punching template;

[0143] 42: Punch die for cutting guide holes;

[0144] 43: Die for slot punching;

[0145] 44: Die for internal blanking;

[0146] 44A: Opening;

[0147] 46: Die for punching the outer shape;

[0148] 46A: Opening;

[0149] 47: upper surface;

[0150] 48: discharge hole;

[0151] 61A-61F: left side guide;

[0152] 62A-62E: right side guide;

[0153] 63-66: lifter;

[0154] 71: lifter body;

[0155] 72-75: elevator section;

[0156] 72A: front surface;

[0157] 72B-75B: upper surface;

[0158] 72C: inclined portion;

[0159] 73A: rear surface;

[0160] 75C: inclined portion;

[0161] 77: hole for lifter;

[0162] 79: Spring for lifter;

[0163] 80: spring receiving hole;

[0164] 81: lifter body;

[0165] 82-84: elevator section;

[0166] 82A: anterior surface;

[0167] 82B-84B: upper surface;

[0168] 82C: inclined portion;

[0169] 83: elevator section;

[0170] 83A: rear surface;

[0171] 84: elevator section;

[0172] 84C: inclined portion;

[0173] 87: hole for lifter;

[0174] 89: Spring for lifter;

[0175] 90: spring receiving hole;

[0176] 100: First production line;

[0177] 101: connecting parts;

[0178] 110: horizontal wall;

[0179] 111: horizontal wall;

[0180] 200: Second production line;

[0181] 201: Connecting parts;

[0182] 210: horizontal wall;

[0183] C: center;

[0184] Da: inner shape;

[0185] Db: appearance;

[0186] F: Strip steel;

[0187] H: represents the imaginary line in the horizontal direction;

[0188] M: laminated core;

[0189] P: guide hole;

[0190] S: slot;

[0191] W: Thin sheet.

Claims

1. A continuous die for punching out thin plate sheets from a strip of thin steel plate intermittently conveyed along a specified conveying direction, wherein: The continuous die is provided with a plurality of workbenches, and the plurality of workbenches respectively perform punching processing on the portions of the strip-shaped thin steel plate corresponding to the thin plate pieces. The plurality of workbenches include a profile punching workbench for punching the profile of the thin plate sheet, The outer shape punching workbench comprises an outer shape punching punch and an outer shape punching die. At least one of the outer shape punching workbench and the workbench adjacent thereto is provided with one or more lifters for lifting the strip-shaped thin steel plate from the surface of the outer shape punching die. At least one of the more than one lifters has a length in the conveying direction that is greater than a length of a maximum opening in the conveying direction, and the maximum opening is the largest opening among a plurality of openings formed on the strip-shaped thin steel plate by punching on the upstream side of the at least one lifter.

2. The continuous die according to claim 1, wherein: The length of the at least one lifter in the conveying direction is greater than the conveying spacing of the strip-shaped thin steel plate.

3. The continuous mold according to claim 1 or 2, wherein: The at least one lifter is disposed on the downstream side of the outer shape punching die in the conveying direction, and the length of the lifter in the conveying direction is greater than the length of the opening of the outer shape punching die in the conveying direction.

4. The continuous die according to any one of claims 1 to 3, wherein: The plurality of workstations include an inner shape punching workstation for punching the inner shape of the thin plate sheet at an upstream side of the outer shape punching workstation in the conveying direction. The inner blanking workbench comprises an inner blanking punch and an inner blanking die. The at least one lifter is arranged on the upstream side of the outer-shape punching die in the conveying direction, and the length of the lifter in the conveying direction is greater than the length of the opening of the inner-shape punching die in the conveying direction.

5. The continuous die according to any one of claims 1 to 4, wherein: The at least one elevator has a structure divided into a plurality of elevator segments connected in the conveying direction.

6. The continuous die according to claim 5, wherein: The at least one lifter is arranged on the downstream side of the outer shape punching die in the conveying direction, The lifting amount of the strip-shaped thin steel plate by each of the lifter stages is set to be higher for lifter stages located on the upstream side in the conveying direction.

7. The continuous die according to claim 5, wherein: The at least one lifter is arranged on the upstream side of the outer shape punching die in the conveying direction, The lifting amount of the strip-shaped thin steel plate by each of the lifter stages is set to be lower for lifter stages located on the downstream side in the conveying direction.

8. The continuous die according to any one of claims 1 to 7, wherein: The at least one lifter includes two or more lifters arranged at intervals in a direction perpendicular to the conveying direction.

9. The continuous die according to claim 8, wherein: Of the two lifters, the one that lifts a portion closer to the center of the outer shape punching die in a direction perpendicular to the conveying direction lifts the strip-shaped thin steel plate more than the other lifter.

10. The continuous die according to any one of claims 1 to 9, wherein: The plurality of work tables are provided for two production lines, respectively, and the two production lines are set to be arranged in parallel in the width direction of the strip-shaped thin steel plate.

11. A processing method using a continuous die for punching out thin plate pieces from a strip-shaped thin steel plate intermittently conveyed in a predetermined conveying direction, wherein: The continuous die is provided with a plurality of workbenches, and the plurality of workbenches respectively perform punching processing on the portions of the strip-shaped thin steel plate corresponding to the thin plate pieces. The plurality of workbenches include a profile punching workbench for punching the profile of the thin plate sheet, In the profile punching workbench, when the strip-shaped thin steel plate is not being transported, the strip-shaped thin steel plate is punched using a profile punching punch and a profile punching die, and when the strip-shaped thin steel plate is being transported, the strip-shaped thin steel plate is lifted from the surface of the profile punching die using one or more lifters provided on at least one of the profile punching workbench and an adjacent workbench. At least one of the more than one lifters has a length in the conveying direction that is greater than a length of a maximum opening in the conveying direction, and the maximum opening is the largest opening among a plurality of openings formed on the strip-shaped thin steel plate by punching on the upstream side of the at least one lifter.

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