JP7385225B1 - Laminated steel plate manufacturing device and laminated steel plate manufacturing method - Google Patents

Abstract

An object of the present invention is to provide a laminated steel plate manufacturing apparatus and a laminated steel plate manufacturing method that reduce steps or gaps that occur in the lamination direction of laminated steel plates in an apparatus for forming and laminating annular steel plates. A laminated steel plate manufacturing apparatus 1 includes a press section 2 that punches out a pressed steel plate piece 31. The press section 2 includes a first press section 11, an upper mold 4 is equipped with a first punch 21 and an auxiliary punch 23, a lower mold 5 is equipped with a first die 22, and the first die 22 is a pressed steel plate piece 31. It can be rotated by a predetermined angle each time it is punched out. The auxiliary punch 23 moves vertically in synchronization with the first punch 21 as the upper mold 4 moves, and can press down the pressed steel plate piece 31 held by the first die 22 . The lower end surface 26 of the auxiliary punch 23 has a first state in which it protrudes below the press surface 20 of the first punch 21 by the thickness T of the steel plate material 30, and a lower end surface 26 that is at the same height as the press surface 20 or lower than the press surface 20. It can be set to a second state in which it is recessed upward. [Selection diagram] Figure 2

Description

The present invention relates to a progressive laminated steel plate manufacturing apparatus and a laminated steel plate manufacturing method using the laminated steel plate manufacturing apparatus.

BACKGROUND ART Conventionally, when manufacturing a laminated core used for a stator of a medium-sized or large-sized rotating machine, a manufacturing apparatus and a manufacturing method have been proposed in which split stators are punched out and then assembled to manufacture an annular core. For example, the manufacturing apparatus described in Patent Document 1 includes a mold having a single part punching section for selectively punching out a concave portion at one end or the other end of a single core piece, and a whole punching part for punching out the entire single core piece. , has a feeding device that feeds the electromagnetic steel sheet to the mold, and a laminated part that receives the punched single core pieces, and by sequentially moving the single core pieces received in the laminated part in an annular shape, a convex part and a concave part are formed. A laminating device is provided for arranging single core pieces so that they face each other.

According to this, since the manufacturing apparatus punches out each single core piece, the punching load can be small, and a small and inexpensive press machine and mold can be used. In addition, since the single core pieces between each layer are stacked so that the convex portions overlap, they have good magnetic properties, and since the convex portions are in opposite directions between each layer, the convex portions It is stated that the fitting portion between the core and the concave portion is sandwiched between the single core pieces in the lamination direction, and a laminated core with excellent mechanical strength (rigidity) is obtained.

Japanese Patent Application Publication No. 2005-20972

However, the invention described in Patent Document 1 has the following problems. This will be explained with reference to FIG. As shown in FIG. 17(a), when a single core piece 131 is punched out of a steel plate material 130, the already punched single core piece 131 is stacked in the lower die 105, and usually the inner circumference of the die 122 and It is supported by a squeeze ring 142. From this state, a single core piece 131 is punched out by the punch 121 in the upper mold 104 and the die 122 in the lower mold 105, as shown in FIG. 17(b).

At this time, at the same time as the single core piece 131 is punched out by the punch 121, the laminated cores 136 already laminated in the lower mold 105 and connected and laminated in an annular shape are simultaneously pushed downward. Then, only the portion pressed by the punch 121 is pressed downward, and the portion not pressed by the punch 121 is held by the die 122 and therefore does not fall downward. 17( As shown in b), on the contrary, the upper surface 131b of the punched single core piece 131 falls downward, resulting in a deviation by the thickness T. Therefore, there is a problem that the single core pieces 131 to be stacked are undulated in the vertical direction or cannot be stacked.

The object of the present invention is to provide a laminated steel plate manufacturing apparatus and a laminated steel plate manufacturing method that reduce steps or gaps that occur in the stacking direction of laminated steel plates in an apparatus that forms and laminates pressed steel plate pieces into annular steel plates in a lower mold. It is to provide.

The laminated steel plate manufacturing apparatus according to the first aspect of the present invention punches out a band-shaped steel plate material that is intermittently conveyed in the conveyance direction into pressed steel plate pieces having a predetermined shape and arranges them in an annular shape to form an annular steel plate. , a laminating device that conveys the steel plate material and includes an upper die and a lower die that are relatively movable in an up-down direction perpendicular to the conveyance direction in order to punch the steel plate material into a predetermined shape. A conveyance device including a conveyance path, and a press section for punching out the pressed steel sheet piece in the upper mold and the lower mold, the press section punching out the outer shape of the pressed steel sheet piece and separating it from the steel sheet material. The first press part includes a first punch and an auxiliary punch in the upper mold, a first die in the lower mold, and the first die is connected to the first punch. The press steel plate piece to be punched out in cooperation with the press steel plate piece can be held inside, and each time the press steel plate piece is punched out in the first press part, the first die rotates the circumference around the center of the first press part. The auxiliary punch is rotatable by a predetermined angle in a direction, and the auxiliary punch moves in the up and down direction in synchronization with the first punch as the upper die moves, and the auxiliary punch moves in the up and down direction in synchronization with the first punch. a first state in which the steel plate piece can be pressed down, and the lower end surface of the auxiliary punch protrudes downward by the thickness of the steel plate material from the pressing surface that is the lower end of the first punch in the vertical direction; It can be set to the same height as the press surface or a second state in which it is recessed above the press surface.

According to this, in the laminated steel sheet manufacturing apparatus, the auxiliary punch can select between the first state and the second state, and the auxiliary punch can press down the pressed steel sheet piece that has already been punched and is held in the first die. . Therefore, the vertical height of the pressed steel plate piece held by the first die can be corrected with respect to the pressed steel plate piece punched by the first punch. When the auxiliary punch is in the first state, the lower end surface of the auxiliary punch protrudes below the press surface by the thickness of the steel plate material, so the height of the upper end surface of the pressed steel plate piece held in the first die is It is possible to correct the position to an appropriate position by lowering the pressed steel plate piece by the thickness of the plate below the upper end face of the pressed steel plate piece punched by the first punch. In addition, when the auxiliary punch is in the second state, the lower end surface of the auxiliary punch is at the same height as the pressing surface or is recessed above the pressing surface, so that the height of the upper end surface of the pressed steel plate piece held in the first die is can be maintained in a corrected state. Therefore, the laminated steel plate manufacturing apparatus is arranged in an annular manner by rotating the first die in the circumferential direction each time a pressed steel plate piece is punched out, and the pressed steel plate is produced in a state where the steps or gaps generated in the lamination direction are reduced by the auxiliary punch. Pieces can be stacked.

Further, in the laminated steel plate manufacturing apparatus, N is a natural number, the first press section is capable of forming the annular steel plate by connecting N pressed steel plate pieces in the circumferential direction, and the first die is provided with a cylindrical hollow capable of holding the annular steel plate, the first punch and the auxiliary punch are relatively movable in the vertical direction in the hollow, and the auxiliary punch is located inside the hollow. In a plane direction perpendicular to the up-down direction, the punch may be placed in an area other than the area where the first punch is placed.

In this case, the auxiliary punch is disposed in the hollow in a plane direction orthogonal to the vertical direction in an area excluding the area where the first punch is disposed, so that it can be operated independently of the first punch. Further, the auxiliary punch can press down the pressed steel plate piece in a region other than the region where the first punch is arranged. Therefore, when the first punch punches out the pressed steel plate piece, it is possible to appropriately correct the vertical position with respect to the already punched pressed steel plate piece, and reduce steps or gaps that occur in the stacking direction.

Further, in the laminated steel plate manufacturing apparatus, M is a divisor of N and less than N, and the first press part is arranged such that the first punches are arranged at M locations at equal angular intervals in the circumferential direction. M pieces of the conveyance path are formed on the upstream side of the first press section, and each time the upper mold moves once in the vertical direction relative to the lower mold, M pieces of the conveyance path are formed on the upstream side of the first press part. Pressed steel pieces may also be formed.

In this case, M pressed steel plate pieces are formed each time the upper mold moves once in the vertical direction relative to the lower mold, so that the manufacturing time can be further shortened.

Further, the laminated steel plate manufacturing apparatus includes an auxiliary punch control device that sets the auxiliary punch to either the first state or the second state, and the annular steel plate is pressed N/M times. It is formed by punching a steel plate piece, and the auxiliary punch control device controls the auxiliary punch to the first state when the first press section punches out the first time, and punches from the second time to the N/Mth time. In this case, the auxiliary punch may be controlled to the second state.

In this case, the auxiliary punch control device controls the auxiliary punch so as to correct the vertical position with respect to the already punched pressed steel plate piece with respect to the level difference that occurs when the first press section punches out for the first time. When punching from the second punch to the N/M punch, the auxiliary punch is controlled so as to maintain the corrected vertical position of the pressed steel plate piece. Therefore, when the first punch punches out a piece of pressed steel plate, the vertical position with respect to the already punched piece of pressed steel plate can be properly corrected and that state can be maintained, thereby reducing steps or gaps that occur in the stacking direction. Can be done.

Further, the laminated steel plate manufacturing apparatus includes a die rotation control device that rotates the first die by a predetermined angle in the circumferential direction, and the annular steel plate is punched out of the pressed steel plate piece N/M times and further after punching. The die rotation control device causes the first die to rotate by an angle of 360/N degrees each time after the first die to ((N/M)-1)th punching. After the N/M-th punching, the control may be performed such that the rotation angle is 360/(2×N) degrees.

In this case, the first die is controlled by the die rotation control device to rotate at an angle of 360/(2×N) degrees after the N/M punching, so that The boundaries that occur in this case are alternated for each sheet in the stacking direction. Therefore, it is possible to prevent the steps in the vertical direction that are likely to occur in the connecting portion in the circumferential direction from overlapping, to further reduce the steps or gaps that occur in the stacking direction, and to further increase the strength.

Further, the press section of the laminated steel sheet manufacturing apparatus includes a second press section that is located upstream of the first press section in the conveying direction and punches out a part of the shape of the pressed steel sheet piece; The first press part is formed so that only the outer shape of the pressed steel plate piece is punched out, and the second press part is formed so that the downstream end of the steel plate material in the conveyance direction is conveyed to the first press part. Up to this point, the pressed steel plate piece may be formed so that parts other than the pressed steel plate piece are removed except for the joint part punched out by the first press part.

In this case, before the steel plate material is conveyed to the first press section, the parts other than the pressed steel plate piece are removed by the second press section, except for the joint portion punched out by the first press section. Therefore, it is possible to reduce the mixing of scraps other than press steel plate pieces into the first die, so it is possible to provide a laminated steel plate manufacturing apparatus that further reduces steps or gaps that occur in the lamination direction. Furthermore, since there is no need to transport the offcuts to the downstream side, the transport device can be simplified.

Further, in the laminated steel plate manufacturing apparatus, the press part can form a steel plate engaging part including a concave part and/or a convex part in the outer shape of the pressed steel plate piece, and the first die is configured to A die uneven portion may be provided in part, and when the steel plate engaging portion is formed on the pressed steel plate piece, the die uneven portion may be rotatable while engaging with the steel plate engaging portion.

In this case, when the first die rotates, the steel plate engaging portion is engaged with the die uneven portion and the pressed steel plate piece is rotated, so that the punched pressed steel plate piece can be rotated more reliably. Therefore, it is possible to provide a laminated steel plate manufacturing apparatus that suppresses improper overlapping of pressed steel plate pieces in the lamination direction of the laminated steel plates, and further reduces steps or gaps that occur in the lamination direction.

Further, in the laminated steel sheet manufacturing apparatus, at least a portion of the die uneven portion is formed in a substantially inverted trapezoidal shape in a radial direction from the center of the first press portion, and the press portion is formed in a concave portion of the steel plate engaging portion. and/or the convex portion can be formed into a substantially inverted trapezoidal shape in the radial direction, and when the steel plate engaging portion is formed on the pressed steel plate piece, the die uneven portion engages with the steel plate engaging portion. Then, the die uneven portion and the steel plate engaging portion may mesh with each other in the radial direction.

In this case, when the die uneven part engages with the steel plate engaging part, the die uneven part and the steel plate engaging part engage with each other in the radial direction from the center of the first press part, so that the steel plate piece is prevented from shifting in the radial direction. It can be suppressed. Therefore, press steel plate pieces adjacent in the circumferential direction can be connected to each other in a state where positional displacement is suppressed.

A laminated steel plate manufacturing method according to a second aspect of the present invention is a manufacturing method in which the pressed steel plate pieces are formed by the laminated steel plate manufacturing apparatus, arranged in a ring shape to form the annular steel plate, and laminated to produce a laminated steel plate. In the first press section, a first step of punching out the outer shape of the pressed steel plate pieces, and rotating the first die to arrange and connect the pressed steel plate pieces in an annular shape to form the annular steel plate. a second step, the first step is a step of punching out the pressed steel sheet piece N/M times, and when punching out the pressed steel sheet piece for the first time, the auxiliary punch is set in the first state; When pressing down the pressed steel plate piece held in the first die to correct it and punching out the pressed steel plate piece from the second time to the N/Mth time, the auxiliary punch is set to the second state and the first die is pressed. The vertical position of the pressed steel plate piece held by the die is maintained in a corrected state.

According to this method, when punching out a piece of pressed steel plate for the first time, the auxiliary punch is placed in the first state, and the pressed steel plate piece that has already been punched out and held in the first die is pushed down and raised up and down. Correct the position. When punching out a pressed steel plate piece from the second time to the N/Mth time, the auxiliary punch is placed in the second state, and the vertical position of the pressed steel plate piece held by the first die is maintained in a corrected state. Therefore, the vertical position of the press steel plate piece to be punched and the press steel plate piece that has already been punched out and held in the first die can be set in an appropriate state, so it is possible to manufacture a laminated steel plate with reduced steps or gaps occurring in the lamination direction. can.

Further, in the method for manufacturing a pressed steel plate piece, the second step forms the annular steel plate by punching the pressed steel plate piece N/M times and rotating in one direction after punching, and the first die is , after the first to ((N/M)-1)th punching, the angle is rotated by 360/N degrees each time, and after the N/Mth punching, the angle is rotated by 360/(2×N) degrees. You may let them.

In this case, the first die rotates through an angle of 360/(2×N) degrees after the N/M punching, so that the boundary between the circumferentially adjacent pressed steel sheet pieces is one sheet in the stacking direction. It will be different each time. Therefore, the steps or gaps occurring in the lamination direction can be further reduced, and a laminated steel plate with further increased strength can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the laminated steel plate manufacturing apparatus 1a of 1st embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II in FIG. 1 and showing the auxiliary punch 23 in a first state. 2 is a cross-sectional view taken along line II in FIG. 1 and showing a second state of the auxiliary punch 23. FIG. It is a figure which showed the pressed steel plate piece 31, (a) shows the state before the pressed steel plate piece 31 is connected, (b) shows the state where the pressed steel plate piece 31 is connected in the circumferential direction. It is a cross section II-II in FIG. 2, and is a cross-sectional view showing the first to Nth punching steps of the pressed steel plate piece 31 and the preparation step for the next first punching. A cross section VV in FIG. 5(a) is shown, in which (a) shows the state before the pressed steel plate piece 31 is punched out, and (b) shows the state after the pressed steel plate piece 31 is punched out. The cross section VI-VI in FIG. 5(c) is shown, in which (a) shows the state before the pressed steel plate piece 31 is punched out, and (b) shows the state after the pressed steel plate piece 31 is punched out. It is a front view of the laminated steel plate 36 manufactured by the laminated steel plate manufacturing apparatus 1 of this invention. 3 is a cross-sectional view taken along line III-III in FIG. 2, showing the first punch 21 in the laminated steel plate manufacturing apparatus 1a. It is a cross section IV-IV in FIG. 2, and is a cross-sectional view showing the first die 22 in the laminated steel plate manufacturing apparatus 1. (a) is a detailed view of part A in FIG. 9, and (b) is a detailed view of part B in FIG. 10. It is a top view which shows the laminated steel plate manufacturing apparatus 1b of 2nd embodiment of this invention. A laminated steel plate manufacturing apparatus 1b according to a second embodiment of the present invention is shown, which corresponds to the cross section II-II in FIG. FIG. 2 is a cross-sectional view showing a preparation process for It is a top view which shows the laminated steel plate manufacturing apparatus 1c of 3rd embodiment of this invention. A laminated steel sheet manufacturing apparatus 1c according to a third embodiment of the present invention is shown, which corresponds to the cross section II-II in FIG. FIG. 2 is a cross-sectional view showing a preparation process for FIG. 2 is a block diagram showing a control device 50 of the laminated steel plate manufacturing apparatus 1. FIG. It is a sectional view showing a laminated steel plate manufacturing apparatus 101 of a conventional example.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, the laminated steel plate manufacturing apparatus 1 which embodies this invention, and the press steel plate piece manufacturing method are demonstrated. Note that the detailed description and the drawings referred to are used to explain technical features that can be adopted by the present invention. The present invention is not limited to these. The configurations shown in the drawings are not intended to be limiting, but are merely illustrative examples.

<Configuration and effects common to the laminated steel plate manufacturing apparatus 1 of each embodiment>
The configuration of the laminated steel plate manufacturing apparatus 1 according to the first aspect of the present invention will be explained. First, with reference to FIGS. 1 to 11, the configuration common to each embodiment will be explained using the laminated steel plate manufacturing apparatus 1a of the first embodiment as an example. The laminated steel plate manufacturing apparatus 1 punches out a band-shaped steel plate material 30, which is intermittently conveyed in the conveyance direction, into pressed steel plate pieces 31 of a predetermined shape, arranges them in an annular shape to form an annular steel plate 32, and stacks and laminates the sheets. A steel plate 36 is formed. The laminated steel plate manufacturing apparatus 1 is a so-called progressive press mold apparatus. The laminated steel plate 36 is used, for example, as an iron core of an armature in a rotating electric machine, and in this case, the pressed steel plate piece 31 is an iron core piece.

<First configuration>
The first configuration of the laminated steel plate manufacturing apparatus 1 will be explained. As shown in FIGS. 2 and 3, the laminated steel plate manufacturing apparatus 1 includes an upper mold 4 and a lower mold that are relatively movable in the vertical direction perpendicular to the conveyance direction in order to punch out a steel plate material 30 into a predetermined shape. It includes a mold 5 and a conveyance device 6 including a conveyance path 3 for conveying a steel plate material 30. Furthermore, as shown in FIG. 1, the upper mold 4 and the lower mold 5 are provided with a press part 2 for punching out a pressed steel plate piece 31. In the example shown in FIG. 1 and the like, a plurality of press sections 2 are formed at predetermined intervals in the conveyance direction. The press section 2 includes a first press section 11 that punches out the outer shape of a pressed steel plate piece 31 and separates it from the steel plate material 30. In the example shown in FIG. 1 and the like, a second press section 12 is provided which is located upstream of the first press section 11 in the conveyance direction and punches out a part of the shape of the pressed steel plate piece 31. The first press section 11 includes an upper mold 4 equipped with a first punch 21 and an auxiliary punch 23, and a lower mold 5 equipped with a first die 22.

As shown in FIGS. 2, 3, 6, and 7, the first die 22 can hold therein a pressed steel plate piece 31 that is punched out in cooperation with the first punch 21. As shown in FIGS. The first die 22 is rotatable by a predetermined angle in the circumferential direction around the first press part center C each time the pressed steel plate piece 31 is punched out in the first press part 11 . The auxiliary punch 23 moves vertically in synchronization with the first punch 21 as the upper mold 4 moves, and can press down the pressed steel plate piece 31 held by the first die 22 . As shown in FIGS. 2 and 6, the lower end surface 26 of the auxiliary punch 23 has a third portion that protrudes below the press surface 20, which is the lower end of the first punch 21, by the thickness T of the steel plate material 30 in the vertical direction. As shown in FIGS. 3 and 7, it is possible to select one state and a second state in which it is at the same height as the pressing surface 20 or is recessed above the pressing surface 20 in the vertical direction. The pressed steel plate piece 31 is continuously punched out in the first press section 11.

FIG. 6A shows the state immediately before the first punch 21 punches the steel plate material 30. In this case, the press steel plate pieces 31 that have already been punched out and held by the first die 22 are arranged in an annular manner in the circumferential direction and connected to each other, indicating the uppermost part of the laminated steel plates 36 . The upper end surface 36a of the laminated steel plate 36 is at approximately the same height in the hollow 29 of the first die 22 in a plane direction perpendicular to the up-down direction. As will be described later, FIG. 6(a) shows the case where a pressed steel plate piece 31 is punched out for the first time when an annular steel plate 32 is formed by connecting N pieces in the circumferential direction.

FIG. 6(b) shows the state immediately after the first punch 21 punches out the steel plate material 30. The lower end surface 26 of the auxiliary punch 23 protrudes below the pressing surface 20 of the first punch 21 by the thickness T of the steel plate material 30, so that at the same time as the steel plate material 30 is punched, the auxiliary punch 23 punches the laminated steel plate. Press down the upper end surface 36a of 36. The upper end surface 36a of the laminated steel plate 36 is in a state in which the vertical height is corrected to an appropriate level.

In the state shown in FIG. 6A, the laminated steel plate 36 is in the same state as when the previous punching was completed, so the upper end surface 36a is maintained at the height immediately after the press surface 20 of the first punch 21 punches. In this state, if the upper end surface 36a of the laminated steel plate 36 is not pressed down, as shown in FIG. A step difference T corresponding to the thickness of the steel plate material 30 occurs between the height and the height.

Although FIG. 6 describes the case where the pressed steel plate piece 31 or the laminated steel plate 36 is held in the first die 22, the press steel plate piece 31 is not held in the first die 22, that is, the pressed steel plate piece 31 is held in the first die 22 to form the laminated steel plate 36 of the lowest layer. The same applies when punching out. In this case, the auxiliary punch 23 presses down the squeeze ring 42 that supports the laminated steel plate 36 from below instead of pressing down the pressed steel plate piece 31 or the uppermost layer of the laminated steel plate 36.

FIG. 7A shows a state immediately before punching out the next pressed steel plate piece 31 after the height of the upper end surface 36a of the laminated steel plate 36 has been corrected, as described with reference to FIG. Although the details will be described later, this is the case where the pressed steel plate piece 31 is punched out for the second time or later. The example shown in FIG. 7 shows a case where the press surface 20 of the first punch 21 and the lower end surface 26 of the auxiliary punch 23 are at the same height. Taking the case of FIG. 5 as an example, when the annular steel plates 32 are stacked by connecting N=6 pieces in the circumferential direction, the number of pressed steel plate pieces 31 at the top of the laminated steel plates 36 is from 1 to (N-1 )=5.

As shown in FIG. 7(b), the pressed steel plate piece 31 is punched out in an area of the uppermost layer of the laminated steel plate 36 that is not yet laminated in the circumferential direction. In this case, the pressed steel plate piece 31 is punched out and pressed down by the first punch 21. The auxiliary punch 23 does not act on the upper end surface 36a of the laminated steel plate 36. However, if the uppermost tier of the laminated steel plate 36 has unevenness in the vertical direction, the auxiliary punch 23 presses down the portion of the uppermost tier that protrudes upward to correct it to an appropriate height position. Note that the lower end surface 26 of the auxiliary punch 23 may be recessed above the press surface 20. This is because if the uppermost layer of the laminated steel plates 36 is maintained at an appropriate height, the auxiliary punch 23 will not work. For example, when the auxiliary punch 23 is in the second state, it is not necessary to lower it simultaneously with the first punch 21.

As shown in FIG. 16, the laminated steel plate manufacturing apparatus 1 is controlled by a control device 50. In the control device 50, an input device 51 is connected to an input/output interface 60, and an input signal is transmitted to a CPU 61 in addition to information from a ROM 62 and a RAM 63, and performs die rotation control processing, auxiliary punch control processing, conveyance drive source drive processing, And the mold lifting/lowering driving process is performed. Instructions necessary for the laminated steel plate 36 to be created are input to the input device 51, and various driving processes and controls are performed. In the first die 22, the die motor drive circuit 52 is controlled by the control device 50, and the die motor 40 is driven. As shown in FIGS. 2 and 3, the conveyance drive circuit 53 is controlled to drive the conveyance drive source 54, and the steel plate material 30 is sent out and conveyed by the conveyance device 6 in an extrusion method from the upstream side.

The upper mold 4 is raised and lowered by controlling the mold raising/lowering drive circuit 55 and driving the mold raising/lowering drive source 56 . The first punch 21 and the auxiliary punch 23 are provided in the upper mold 4 and move in the vertical direction as the upper mold 4 moves in the vertical direction. Both the first punch 21 and the auxiliary punch 23 are movable in the vertical direction with respect to the hollow 29 of the first die 22. The auxiliary punch 23 is controlled by the auxiliary punch drive circuit 57 and set to the first state and the second state by the operation of an air cylinder serving as the auxiliary punch drive source 27.

<Effects of the first configuration>
According to the first configuration described above, the following effects are achieved. In the laminated steel plate manufacturing apparatus 1, the auxiliary punch 23 can select between a first state and a second state, and can press down a pressed steel plate piece 31 that has already been punched and is held in the first die 22. Therefore, the vertical height of the pressed steel plate piece 31 held by the first die 22 can be corrected with respect to the pressed steel plate piece 31 punched by the first punch 21.

As shown in FIG. 6, when the auxiliary punch 23 is in the first state, the lower end surface 26 of the auxiliary punch 23 protrudes below the press surface 20 by a thickness T of the steel plate material 30. Therefore, the height of the upper end surface 36a of the laminated steel plate 36, which is the pressed steel plate piece 31 held by the first die 22, is lowered by the plate thickness T than the upper end surface 31b of the pressed steel plate piece 31 punched by the first punch 21. The position can be corrected to an appropriate position.

Further, as shown in FIG. 7, when the auxiliary punch 23 is in the second state, the lower end surface 26 of the auxiliary punch 23 is at the same height as the press surface 20 or is recessed above the press surface 20, so that the first die 22 It is possible to maintain the height of the upper end surface 31b of the pressed steel plate piece 31 held in the corrected state. Therefore, in the laminated steel plate manufacturing apparatus 1, the first die 22 rotates in the circumferential direction every time a pressed steel plate piece 31 is punched, so that the first die 22 is arranged in an annular shape, and the step or gap generated in the lamination direction by the auxiliary punch 23 is reduced. The pressed steel plate pieces 31 can be laminated in this state.

<Second configuration>
Next, a second configuration of the laminated steel plate manufacturing apparatus 1 will be explained. N is a natural number, and the first press section 11 can form the annular steel plate 32 by connecting N pressed steel plate pieces 31 in the circumferential direction. As shown in FIG. 4(a), the pressed steel plate piece 31 has an engaging protrusion 31c formed at one end connected in the circumferential direction, and an engaging recess 31d formed at the other end. . The first die 22 rotates by a predetermined angle in the circumferential direction of the first press part center C each time a pressed steel plate piece 31 is punched out in the first press part 11, and then the first die 22 rotates by a predetermined angle in the circumferential direction of the first press part center C. 31 is punched out, the engagement protrusion 31c and the engagement recess 31d are fitted and connected, as shown in FIG. 4(b). Note that the predetermined angle here is an angle at which the pressed steel plate pieces 31 are rotated so that their ends coincide with each other so that they are connected in the circumferential direction.

The example shown in FIG. 5 shows a case where N is 6. As shown in FIGS. 6 and 7, the first die 22 includes a cylindrical hollow 29 in which the annular steel plate 32 can be accommodated. The first punch 21 and the auxiliary punch 23 are relatively movable in the vertical direction in the hollow 29. As shown in FIG. 5A, the auxiliary punch 23 is arranged in an area of the hollow 29 in a plane direction perpendicular to the up-down direction, excluding the area where the first punch 21 is arranged.

<Effects of the second configuration>
According to the second configuration described above, the following effects are achieved. As shown in FIG. 5(a), the auxiliary punch 23 of the laminated steel plate manufacturing apparatus 1 is arranged in an area of the hollow 29 in a plane direction perpendicular to the up-down direction, excluding the area where the first punch 21 is arranged. Therefore, it can be operated independently of the first punch 21. Further, the auxiliary punch 23 can be pressed down when the pressed steel plate piece 31 is located in the hollow 29 in a region other than the region where the first punch 21 is arranged. Therefore, when the first punch 21 punches out the pressed steel plate piece 31, the vertical position with respect to the pressed steel plate piece 31 that has already been punched out and held in the first die 22 is appropriately corrected, and the step or gap that occurs in the stacking direction is corrected. can be reduced.

<Third configuration>
Next, a third configuration of the laminated steel plate manufacturing apparatus 1 will be explained. M is a divisor of N and is less than N, and the first punches 21 of the first press section 11 are arranged at M locations at equal angular intervals in the circumferential direction. For example, when N is 6, M is 1, 2, or 3, and when N is 8, M is 1, 2, or 4. Each time the upper mold 4 moves vertically once relative to the lower mold 5, M pressed steel plate pieces 31 are formed. M differs depending on each embodiment described later. As shown in FIGS. 1 and 5, in the laminated steel plate manufacturing apparatus 1a of the first embodiment, N is 6, M is 1, and the number of transport paths 3 is one. Embodiments other than the first embodiment will be described later.

Further, as described later, when the press section 2 includes the second press section 12, the second press section 12 is provided at M locations on the upstream side of each first punch 21 in the conveyance direction. M conveyance paths 3 are formed in the direction connecting the first press section 11 and the second press section 12.

<Effects of the third configuration>
According to the third configuration described above, the following effects are achieved. In the laminated steel plate manufacturing apparatus 1, M pressed steel plate pieces 31 are formed each time the upper mold 4 moves once in the vertical direction relative to the lower mold 5, so that the above-described effects can be achieved. In addition, manufacturing time can be shortened. In the laminated steel plate manufacturing apparatus 1a of the first embodiment shown in FIGS. 1 to 11, since M is 1, when the upper mold 4 moves once in the vertical direction relative to the lower mold 5, one press Although the steel plate pieces 31 are formed, in the laminated steel plate manufacturing apparatus 1b of the second embodiment and the laminated steel plate manufacturing apparatus 1c of the third embodiment, which will be described later, a plurality of pressed steel plate pieces 31 are formed.

<Fourth configuration>
Next, a fourth configuration of the laminated steel plate manufacturing apparatus 1 will be explained. As shown in FIG. 16, the laminated steel plate manufacturing apparatus 1 includes an auxiliary punch control device 59 that sets the auxiliary punch 23 to either the first state or the second state. The auxiliary punch control device 59 includes an air cylinder that is the auxiliary punch drive source 27 and an auxiliary punch drive circuit 57.

The annular steel plate 32 is formed by punching the pressed steel plate piece 31 N/M times. When the first press section 11 punches out the punch for the first time, the auxiliary punch control device 59 controls the auxiliary punch 23 to be in the first state as shown in FIG. 6 and the like. When punching from the second to N/M times, the auxiliary punch 23 is controlled to the second state as shown in FIG. 7 and the like.

2, FIG. 5(a), and FIG. 6 show the state in which the pressed steel plate piece 31 is punched out for the first time. In the first state, the lower end surface 26 of the auxiliary punch 23 protrudes below the press surface 20 of the first punch 21 by the thickness T of the steel plate material 30. As shown in FIG. 2, the first state is a state in which the auxiliary punch slide cam 24 is pushed to the left in the figure by the air cylinder that is the auxiliary punch drive source 27, and the auxiliary punch 23 is pushed down.

As shown in FIGS. 2 and 6, when the pressed steel plate piece 31 is punched out for the first time, the pressed steel plate piece 31 is punched out by the first punch 21 and simultaneously pushed downward. When the pressed steel plate pieces 31 are punched out for the first time, the pressed steel plate pieces 31 held by the first die 22 are connected in the circumferential direction to form an annular steel plate 32. At this time, the laminated steel plate 36 on which the annular steel plate 32 is laminated is held by the squeeze ring 42 and the inner peripheral wall of the hollow 29 of the first die 22. The pressed steel plate piece 31 held by the first die 22 is pushed down simultaneously with the first punch 21 by the auxiliary punch 23 in the first state. As a result, the pressed steel plate piece 31 held in the punched state by the first die 22 is pressed down by the auxiliary punch 23, so that the vertical position is corrected.

3, FIG. 5(b), FIG. 5(c), and FIG. 7 show the state of punching from the second time to the N/Mth time. As shown in FIG. 3, in the second state, the auxiliary punch slide cam 24 is pulled to the right in the figure by the air cylinder that is the auxiliary punch drive source 27. The auxiliary punch 23 is pushed up by the auxiliary punch spring 25 so that the lower end surface 26 is at the same height as the pressing surface 20 of the first punch 21 or at a position above the pressing surface 20.

As shown in FIGS. 3 and 7, the already punched pressed steel plate piece 31 held in the hollow 29 has been pushed down by the plate thickness T, and its vertical position has been corrected. Therefore, when the pressed steel plate piece 31 is punched from the second time onwards, if the pressed steel plate piece 31 held by the first die 22 is corrected without any unevenness, the auxiliary punch 23 will punch out the pressed steel plate piece 31. Doesn't work. However, if the pressed steel plate piece 31 partially protrudes upward, it will be pressed down by the auxiliary punch 23 and the vertical position will be corrected.

<Effects of the fourth configuration>
According to the third configuration described above, the following effects are achieved. As shown in FIG. 2, FIG. 5(a), and FIG. 6, the auxiliary punch 23 is controlled by the auxiliary punch control device 59 to compensate for the difference in level created during the first punching with the already punched pressed steel plate piece 31. Correct the vertical position. As shown in FIG. 3, FIG. 5(b), FIG. 5(c), and FIG. 7, control is performed to maintain the corrected vertical position of the press steel plate piece 31 when punching from the second to N/M times. be done. Therefore, when the first punch 21 punches out the pressed steel plate piece 31, the vertical position relative to the already punched pressed steel plate piece 31 can be properly corrected and this state can be maintained, so that steps or gaps occurring in the stacking direction can be eliminated. can be reduced.

<Fifth configuration>
Next, a fifth configuration of the laminated steel plate manufacturing apparatus 1 will be explained. As shown in FIG. 16, the laminated steel plate manufacturing apparatus 1 includes a die rotation control device 58 that rotates the first die 22 by a predetermined angle in the circumferential direction. The annular steel plate 32 is formed by punching the press steel plate piece 31 N/M times and further rotating in one direction after punching. The die rotation control device 58 includes a die motor 40 and a die motor drive circuit 52. As shown in FIGS. 2 and 3, the die motor 40 and the first die 22 are connected by a drive belt 41, and the drive belt 41 transmits the rotation of the die motor 40 to the first die 22 to rotate it. .

As shown in FIGS. 5(a) to 5(c), the die rotation control device 58 causes the first die 22 to rotate after each punching from the first to ((N/M)-1) times. It is controlled to rotate by an angle of 360/N degrees, which is R. As shown in FIG. 5(d), after the N/M-th punching, control is performed to rotate by an angle of 360/(2×N) degrees, which is R/2.

The rotation directions from FIG. 5(a) to FIG. 5(d) are the same direction, and are rotated clockwise as shown in the drawings, for example. For example, when N is 6 and M is 1, the punch is rotated by 60 degrees, which is R, after the first to fifth punching, and rotated by 30 degrees, which is R/2, after the sixth punch.

FIG. 8 is a front view of a laminated steel plate 36 in which a plurality of pressed steel plate pieces 31 are stacked vertically. Through the steps from FIG. 5A to FIG. 5D, the boundaries 37 in the circumferential direction of the press steel plate pieces 31 are stacked such that each sheet is shifted at equal angular intervals in the vertical direction.

<Effects of the fifth configuration>
According to the fifth configuration described above, the following effects are achieved. The first die 22 is rotated through an angle of 360/(2×N) degrees by the die rotation control device 58 after the N/M-th punching. Boundaries 37 formed between press steel plate pieces 31 adjacent in the circumferential direction are alternated for each piece in the stacking direction. Therefore, the laminated steel plate manufacturing apparatus 1 can prevent the steps in the vertical direction that are likely to occur in the connecting portions in the circumferential direction from overlapping, further reduce the steps or gaps that occur in the lamination direction, and further increase the strength. can.

<Sixth configuration>
Next, a sixth configuration of the laminated steel plate manufacturing apparatus 1 will be explained. As shown in FIG. 1, etc., the press section 2 of the laminated steel sheet manufacturing apparatus 1 is located upstream of the first press section 11 in the conveying direction, and is located at a second press section that punches out a part of the shape of the pressed steel sheet piece 31. A press section 12 is provided. The first press part 11 is formed so that only the outer shape of the press steel plate piece 31 is punched out. The second press section 12 is configured to press a pressed steel sheet piece 31, excluding a connecting portion 35 punched out by the first press section 11, before the downstream end of the steel sheet material 30 in the conveyance direction is conveyed to the first press section 11. It is formed by removing the other parts.

As shown in FIG. 1 and the like, the steel plate material 30 is machined with pilot holes 33 and slots 34 by the second press part 12, and further, the external shape of the steel plate material 30 other than the connecting part 35 is machined by the trim part 13. The steel plate material 30 is conveyed to the first press section 11 in a state in which the portion other than the portion forming the pressed steel plate piece 31 is removed.

<Effects of the sixth configuration>
According to the sixth configuration described above, the following effects are achieved. The laminated steel sheet manufacturing apparatus 1 is configured such that, before the steel sheet material 30 is conveyed to the first press section 11 by the second press section 12, the second press section 12 punches out the connecting portions 35, which are punched out by the first press section 11. Portions other than the pressed steel plate piece 31 are removed. Therefore, it is possible to reduce the mixing of scraps other than the pressed steel plate pieces 31 into the first die 22, and therefore it is possible to further reduce the steps or gaps that occur in the stacking direction. Moreover, since there is no need to convey the offcuts to the downstream side, the conveying device 6 can be simplified. As will be described later, this is particularly effective for the laminated steel plate manufacturing apparatus 1b of the second embodiment and the laminated steel plate manufacturing apparatus 1c of the third embodiment.

<Seventh configuration>
Next, a seventh configuration of the laminated steel plate manufacturing apparatus 1 will be explained. As shown in FIG. 11, in the laminated steel plate manufacturing apparatus 1, the press section 2 can form a steel plate engaging part 31a including a concave part and/or a convex part in the outer shape of a pressed steel plate piece 31. The first die 22 includes a die uneven portion 28 at least partially in the circumferential direction. When the steel plate engaging portion 31a is formed on the pressed steel plate piece 31, the die uneven portion 28 is rotatable while engaging with the steel plate engaging portion 31a. That is, when the first die 22 rotates, the steel plate engaging portion 31a is engaged with the die uneven portion 28, and the pressed steel plate piece 31 rotates. The steel plate engaging portion 31a is formed in the first press portion 11 and/or the second press portion 12.

Further, as shown in FIG. 11, in the laminated steel plate manufacturing apparatus 1, at least a portion of the die uneven portion 28 is formed into a substantially inverted trapezoidal shape in the radial direction from the center C of the first press portion. The press part 2 can form the concave part and/or the convex part of the steel plate engaging part 31a into a substantially inverted trapezoidal shape in the radial direction from the first press part center C. When the steel plate engaging part 31a is formed on the pressed steel plate piece 31, when the die uneven part 28 engages with the steel plate engaging part 31a, the die uneven part 28 and the steel plate engage in the radial direction from the center C of the first press part. The portions 31a engage with each other.

FIG. 11(a) illustrates a part of the outer shape of the pressed steel plate piece 31, and the steel plate engaging portion 31a is formed in a shape including projections and depressions. FIG. 11(b) shows a die uneven portion 28 in which a shape including unevenness is formed on the inner circumferential wall of the first die 22 corresponding to the steel plate engaging portion 31a. The corresponding concave and convex portions have shapes that engage with each other, one concave portion of the steel plate engaging portion 31a has an angle of θ1, the angle of the convex portion of the die concave and convex portion 28 has an angle of θ1, and similarly, the angle of the convex portion of the die concave and convex portion 28 is θ1. The angle θ2, the angle θ3, the angle θ4, and the angle θ5 are also formed to be able to engage with each other. The unevenness of the die uneven portion 28 and the steel plate engaging portion 31a is approximately in the shape of an inverted trapezoid in the radial direction from the center C of the first press portion. From angle θ1 to angle θ5 in each unevenness, the engaging surfaces are formed so as to bite into each other with respect to rotation about the first press part center C.

The uneven surfaces of the steel plate engaging portion 31a and the die uneven portion 28 that engage in the circumferential direction with respect to the center C of the first press portion intersect when an imaginary line is drawn in the radial direction from the center C of the first press portion. The steel plate engaging part 31a may be formed in a part of the press part 2 other than the first press part 11, and in that case, the steel plate engaging part 31a may be formed at a diameter from the virtual center assuming that the pressed steel plate piece 31 is formed into the annular steel plate 32. It is formed into a substantially inverted trapezoidal shape in the direction.

As shown in FIGS. 9 and 10, the first punch 21 and the first die 22 are formed so that their phases match at every predetermined angle in the circumferential direction. When the angle that the pressed steel plate piece 31 occupies in the circumferential direction is R, the first punch 21 and the first die 22 are repeatedly formed in the same shape in units of angle R/2 in the circumferential direction. As explained in the fifth configuration, the first die 22 is controlled to rotate by an angle of 360/N degrees each time after punching the pressed steel plate piece 31 from the first punch to the (N/M)-1 punch. , N/M times, and then rotated by an angle of 360/(2×N) degrees.

For example, when N is 6, the first die 22 rotates 60 degrees after the first to (N/M)-1 punching, and rotates 30 degrees after the N/M punching. In this case, R is 60 degrees, and the first punch 21 and the first die 22 have the same shape repeated in the circumferential direction in units of R/2=30 degrees. That is, in the circumferential direction, the first punch 21 is fixed, and the first die 22 may rotate 60 degrees or 30 degrees after punching the pressed steel plate piece 31. In either case, the first punch 21 and the first die 22 are configured to punch out the pressed steel plate piece 31 without interfering with each other.

<Effects of the seventh configuration>
According to the seventh configuration described above, the following effects are achieved. As shown in FIG. 11, in the laminated steel plate manufacturing apparatus 1, when the first die 22 rotates, the steel plate engaging part 31a is engaged with the die uneven part 28 and the pressed steel plate piece 31 rotates, so that the laminated steel plate manufacturing apparatus 1 can be manufactured more reliably. The punched pressed steel plate piece 31 can be rotated. Therefore, the pressed steel plate pieces 31 are prevented from overlapping inappropriately in the lamination direction of the laminated steel plates 36, and the steps or gaps that occur in the lamination direction can be further reduced.

Further, as shown in FIG. 11, when the die uneven part 28 engages with the steel plate engaging part 31a, the die uneven part 28 and the steel plate engaging part 31a engage with each other in the radial direction from the center C of the first press part. Therefore, displacement of the pressed steel plate piece 31 in the radial direction can be suppressed. Therefore, the press steel plate pieces 31 that are adjacent to each other in the circumferential direction can be connected to each other in a state where positional displacement is suppressed.

<Configuration and effects of the laminated steel plate manufacturing apparatus 1a of the first embodiment>
Next, a laminated steel plate manufacturing apparatus 1a of a first embodiment according to the first aspect of the present invention will be described. The configuration of the laminated steel plate manufacturing apparatus 1a has already been explained in terms of the common configuration with reference to FIGS. The point is that one pressed steel plate piece 31 is formed by the punching operation twice. As shown in FIG. 1, a second press section 12a is formed on one conveyance path 3 upstream of the first press section 11a. As shown in FIG. 2, the first press section 11a includes a pair of first punches 21a, a first die 22a, and an auxiliary punch 23a. According to this configuration, in addition to various effects due to the common configuration, the configuration of the apparatus can be simplified, so that it is possible to provide a laminated steel plate manufacturing apparatus 1a that can manufacture laminated steel plates 36 with high precision.

<Configuration of laminated steel plate manufacturing apparatus 1b of second embodiment>
Next, with reference to FIGS. 12 and 13, a laminated steel plate manufacturing apparatus 1b of a second embodiment according to the first aspect of the present invention will be described. In the laminated steel plate manufacturing apparatus 1b, M is 2 as described in the third configuration in the common configuration. As shown in FIG. 12, in the laminated steel plate manufacturing apparatus 1b, two conveyance paths 3 are formed in a direction of 180 degrees around a first press section 11b, and a second press section 12b is formed in each conveyance path 3. Ru. Similarly to the second press part 12a, the steel plate material 30 is machined with pilot holes 33 and slots 34 by the second press part 12b, and further, the external shape of the steel plate material 30 other than the connecting part 35 is processed by the trim part 13. . The steel plate material 30 is conveyed to the first press section 11b with parts other than the portion forming the pressed steel plate piece 31 removed.

FIG. 13 is a diagram corresponding to FIG. 5 of the laminated steel plate manufacturing apparatus 1a of the first embodiment. As shown in FIG. 13(a), the first punch 21b is formed so as to be opposed to each other by 180 degrees in the circumferential direction in accordance with the position where the second press portion 12b is formed. The auxiliary punches 23b are arranged at two locations in the region excluding the region where the first punch 21b is arranged. As shown in FIGS. 13(b) and 13(c), the first die 22b punches 360/N each time after punching the pressed steel plate piece 31 from the first punch to the ((N/M)-1) punch. Controlled to rotate by degrees. Further, as shown in FIG. 13(d), after the N/Mth punching, it is controlled to rotate by an angle of 360/(2×N) degrees. This is the content explained in the fifth configuration.

In the example shown in FIG. 13, N is 6 and M is 2 of the divisors of 6. R indicates the angle that one pressed steel plate piece 31 occupies in the circumferential direction, and when N is 6, it is 60 degrees. After the N/Mth punch, that is, the third punch, the first die 22b rotates 30 degrees. In the laminated steel plate manufacturing apparatus 1b, an annular steel plate 32 is formed from N pressed steel plate pieces 31 in a punching process of N/M=6/2=3 times.

<Effects of the laminated steel plate manufacturing apparatus 1b of the second embodiment>
According to the configuration of the laminated steel plate manufacturing apparatus 1b of the second embodiment described above, the following effects are achieved. As shown in FIG. 13, in the laminated steel plate manufacturing apparatus 1b, since M explained in the third to fifth configurations is 2, the upper die 4 is vertically moved relative to the lower die 5. Two pressed steel plate pieces 31 are formed each time it moves once. Therefore, it is possible to provide a laminated steel plate manufacturing apparatus 1b that shortens manufacturing time. Note that, as explained in the sixth configuration, the steel plate material 30 is conveyed to the first press section 11b in a state in which the portion other than the portion forming the pressed steel plate piece 31 is removed, so that the conveyance path 3 is Even if it is formed, there is no need to process the scraps after being punched out by the first press section 11b.

<Configuration of laminated steel plate manufacturing apparatus 1c of third embodiment>
Next, with reference to FIGS. 14 and 15, a laminated steel plate manufacturing apparatus 1c of a third embodiment according to the first aspect of the present invention will be described. In the laminated steel plate manufacturing apparatus 1c, M is 4 as described in the third configuration in the common configuration. In the example shown here, N is 8, and M is 4 among the divisors of 8. As shown in FIG. 14, in the laminated steel plate manufacturing apparatus 1c, four conveyance paths 3 are formed at 90 degree intervals around a first press section 11c, and a second press section 12c is formed in each conveyance path 3. . Similarly to the second press part 12a, the steel plate material 30 is machined with pilot holes 33 and slots 34 by the second press part 12c, and further, the external shape of the steel plate material 30 other than the connecting part 35 is processed by the trim part 13. . The steel plate material 30 is conveyed to the first press section 11c with parts other than the portion forming the pressed steel plate piece 31 removed.

FIG. 15 is a diagram corresponding to FIG. 5 of the laminated steel plate manufacturing apparatus 1a of the first embodiment. As shown in FIG. 15(a), the first punches 21c are formed at four locations every 90 degrees in the circumferential direction, corresponding to the positions where the second press portions 12c are formed. The auxiliary punches 23c are arranged at four locations in the region excluding the region where the first punch 21c is arranged.

As shown in FIG. 15(b), the first die 22c rotates through an angle of 360/N degrees each time after punching out the pressed steel plate piece 31 from the first punch to the ((N/M)-1) punch. As shown in FIG. 15(c), after the N/Mth punching, it is controlled to rotate by an angle of 360/(2×N) degrees. In the example of FIG. 15, N is 8 and M is 4 among the divisors of 8. In this case, (N/M)-1=8/4-1=1, and N/M=8/4=2. That is, as shown in FIG. 15(b), after the first punching, the first die 22c rotates 360/N=360/8=45 degrees, and as shown in FIG. 15(c), the first die 22c performs the second punching. Afterwards, it is rotated by 360/(2×N)=360/(2×8)=22.5 degrees. In the laminated steel plate manufacturing apparatus 1c, an annular steel plate 32 is formed by N pressed steel plate pieces 31 in a punching process of N/M=8/4=2 times.

<Effects of the laminated steel plate manufacturing apparatus 1c of the third embodiment>
According to the configuration of the laminated steel plate manufacturing apparatus 1c of the third embodiment described above, the following effects are achieved. As shown in FIG. 15, in the laminated steel plate manufacturing apparatus 1c, since M explained in the third to fifth configurations is 4, the upper die 4 is vertically moved relative to the lower die 5. Each time it moves, four pressed steel plate pieces 31 are formed. In the example of FIG. 15, since N is 8, the annular steel plate 32 connected in the circumferential direction can be formed in two punching steps. Therefore, it is possible to provide a laminated steel plate manufacturing apparatus 1c that can further shorten the manufacturing time. Note that, as explained in the sixth configuration, the steel plate material 30 is conveyed to the first press section 11c in a state in which the portion other than the portion forming the pressed steel plate piece 31 is removed, so that the conveyance path 3 is arranged in multiple directions. Even if it is formed, there is no need to process the scraps after being punched out by the first press section 11c.

<Explanation of laminated steel plate manufacturing method>
Next, a method for manufacturing a laminated steel plate according to a second aspect of the present invention will be explained. The laminated steel plate production method is a manufacturing method in which the laminated steel plate production apparatus 1 punches out a steel plate material 30 to form a pressed steel plate piece 31, arranges it in a ring shape to form an annular steel plate 32, and stacks it to produce a laminated steel plate 36. The laminated steel sheet manufacturing method includes a first step of punching out the outer shape of a pressed steel sheet piece 31 in a first press section 11, as shown in FIG. A second step of arranging and connecting the pressed steel plate pieces 31 in an annular manner is provided. Note that when the press section 2 includes the second press section 12, the first step includes a step of punching out a part of the shape of the pressed steel plate piece 31.

In the first step, as shown in FIGS. 2 and 6, in the step of punching out the pressed steel plate piece 31 N/M times, when punching out the pressed steel plate piece 31 for the first time, the auxiliary punch 23 is set in the first state. , press down the pressed steel plate piece 31 that has already been punched out. When punching out the pressed steel plate piece 31 from the second time to the N/Mth time, as shown in FIGS. The vertical position of is maintained in a corrected state. Note that if the pressed steel plate piece 31 held by the first die 22 is properly corrected without unevenness, the auxiliary punch 23 will not act on the pressed steel plate piece 31. However, if the pressed steel plate piece 31 partially protrudes upward, the auxiliary punch 23 will press down and correct the vertical position.

Further, as shown in FIG. 5 and the like, in the second step, an annular steel plate 32 is formed by punching the press steel plate piece 31 N/M times and rotating it in one direction after punching. The first die 22 is rotated at an angle of 360/N degrees each time after the first to ((N/M)-1)th punching, and after the N/Mth punching, the first die 22 is rotated at an angle of 360/(2×N ) degrees of rotation.

In addition, as shown in FIGS. 9 and 11, in the first step, the first press part 11 and/or the second press part 12 are engaged with a steel plate that includes a concave part and/or a convex part in the outer shape of the pressed steel plate piece 31. A portion 31a is formed. The first die 22 includes a die uneven portion 28 that can be engaged with the steel plate engaging portion 31a. In the second step, the first die 22 engages the steel plate engaging portion 31a with the die uneven portion 28 and rotates the pressed steel plate piece 31.

<Effects of laminated steel plate manufacturing method>
According to the laminated steel plate manufacturing method explained above, the following effects are achieved. As shown in FIGS. 2 and 6, in the laminated steel plate manufacturing method, when punching out a pressed steel plate piece 31 for the first time, the auxiliary punch 23 is set to the first state so that the pressed steel plate piece 31 is already punched out and held in the first die 22. Press down the pressed steel plate piece 31. As shown in FIGS. 3 and 7, when punching out the pressed steel plate piece 31 from the second to N/M times, the auxiliary punch 23 is put in the second state, and the pressed steel plate piece 31 held by the first die 22 is punched out. The vertical position of is maintained in a corrected state. Therefore, the vertical positions of the press steel plate piece 31 to be punched and the press steel plate piece 31 that has already been punched out and held in the first die 22 can be set in an appropriate state, so that the laminated steel plate 36 with reduced steps or gaps occurring in the lamination direction can be created. can be manufactured.

In addition, as shown in FIG. 5 etc., the first die 22 rotates at an angle of 360/(2×N) degrees after the N/M punching, so that the first die 22 rotates at an angle of 360/(2×N) degrees, so that the first die 22 rotates at an angle of 360/(2×N) degrees, so that the first die 22 rotates at an angle of 360/(2×N) degrees, so that The resulting boundaries 37 are alternated for each sheet in the stacking direction. Therefore, it is possible to prevent the steps that tend to occur in the connecting portions in the circumferential direction from overlapping in the vertical direction, to further reduce the steps or gaps that occur in the lamination direction, and to manufacture a laminated steel plate 36 with further increased strength.

Further, as shown in FIGS. 9 and 11, when the first die 22 rotates, the die uneven portion 28 engages the steel plate engaging portion 31a and rotates the pressed steel plate piece 31, so that the punching can be performed more reliably. The pressed steel plate piece 31 can be rotated. Therefore, the laminated steel plate manufacturing method suppresses improper overlapping of the pressed steel plate pieces 31 in the lamination direction of the laminated steel plate 36, and can manufacture a laminated steel plate 36 that further reduces steps or gaps that occur in the lamination direction.

1, 1a, 1b, 1c Laminated steel plate manufacturing apparatus 2 Press section 3 Conveyance path 4 Upper die 5 Lower die 6 Conveyance device 11, 11a, 11b, 11c First press section 12, 12a, 12b, 12c Second press section 20 Press surface 21, 21a, 21b, 21c First punch 22, 22a, 22b, 22c First die 23, 23a, 23b, 23c Auxiliary punch 26 Lower end surface 28 Die uneven portion 29 Hollow 30 Steel plate material 31 Pressed steel plate piece 31a Steel plate Engagement part 32 Annular steel plate 35 Connecting part 36 Laminated steel plate 50 Control device 58 Die rotation control device 59 Auxiliary punch control device C First press part center T Plate thickness

Claims (10)

An apparatus for punching out a band-shaped steel plate material that is intermittently conveyed in the conveyance direction into pressed steel plate pieces of a predetermined shape and arranging them in an annular shape to form annular steel plates and stacking them,
an upper mold and a lower mold that are relatively movable in an up-down direction perpendicular to the conveyance direction in order to punch the steel plate material into a predetermined shape;
a conveyance device including a conveyance path for conveying the steel plate material;
The upper mold and the lower mold include a press part for punching out the pressed steel plate piece,
The press part includes a first press part that punches out the outer shape of the pressed steel plate piece and separates it from the steel plate material,
The first press section includes a first punch and an auxiliary punch in the upper mold, a first die in the lower mold,
The first die is capable of holding the pressed steel plate piece punched in cooperation with the first punch,
The first die is rotatable by a predetermined angle in a circumferential direction around the center of the first press section each time the press steel plate piece is punched out in the first press section,
The auxiliary punch is capable of moving in the vertical direction in synchronization with the first punch as the upper mold moves, and pushing down the pressed steel plate piece held by the first die,
The lower end surface of the auxiliary punch is configured such that in the up-down direction,
A first state in which the punch protrudes below the pressing surface, which is the lower end of the first punch, by the thickness of the steel plate material, and a second state in which the punch is at the same height as the pressing surface or recessed above the pressing surface. Laminated steel sheet production equipment that can be configured. N is a natural number,
The first press part can form the annular steel plate by connecting N pressed steel plate pieces in the circumferential direction,
The first die includes a cylindrical hollow that can hold the annular steel plate,
The first punch and the auxiliary punch are relatively movable in the vertical direction in the hollow,
The laminated steel plate manufacturing apparatus according to claim 1, wherein the auxiliary punch is arranged in an area of the hollow space in a plane direction perpendicular to the up-down direction, excluding an area where the first punch is arranged. M is a divisor of N and is less than N;
In the first press part, the first punches are arranged at M locations at equal angular intervals in the circumferential direction,
M number of the conveyance paths are formed upstream of the first press section,
3. The laminated steel plate manufacturing apparatus according to claim 2, wherein M pieces of the pressed steel plate are formed each time the upper mold moves once in the vertical direction relative to the lower mold. an auxiliary punch control device that sets the auxiliary punch to either the first state or the second state;
The annular steel plate is formed by punching the pressed steel plate piece N/M times,
The auxiliary punch control device controls the auxiliary punch to the first state when punching the first press part for the first time, and controls the auxiliary punch to the first state when punching from the second time to N/M times. The laminated steel plate manufacturing apparatus according to claim 3, wherein the laminated steel plate manufacturing apparatus is controlled to the second state. comprising a die rotation control device that rotates the first die by a predetermined angle in the circumferential direction;
The annular steel plate is formed by punching the pressed steel plate piece N/M times and further rotating in one direction after punching,
The die rotation control device includes:
The first die is controlled to rotate at an angle of 360/N degrees each time after the first to ((N/M)-1)th punching, and after the N/Mth punching, the first die rotates at an angle of 360/( The laminated steel plate manufacturing apparatus according to claim 4, wherein the laminated steel plate manufacturing apparatus is controlled to rotate by an angle of 2×N) degrees. The press section includes a second press section that is located upstream of the first press section in the conveyance direction and punches out a part of the shape of the pressed steel plate piece,
The first press part is formed so that only the outer shape of the press steel plate piece is punched out,
The second press section is configured to press the pressed steel sheet piece, excluding a connecting portion punched out by the first press section, before the downstream end of the steel sheet material in the conveyance direction is conveyed to the first press section. The laminated steel plate manufacturing apparatus according to any one of claims 1 to 5, which is formed so as to remove other parts. The press part can form a steel plate engaging part including a concave part and/or a convex part in the outer shape of the pressed steel plate piece,
The first die is
A die uneven portion is provided in at least a portion of the circumferential direction,
The laminated steel plate manufacturing apparatus according to any one of claims 1 to 5, wherein when the steel plate engaging portion is formed on the pressed steel plate piece, the die uneven portion is rotatable while engaging with the steel plate engaging portion. . At least a portion of the die uneven portion is formed in a substantially inverted trapezoidal shape in a radial direction from the center of the first press portion,
The press part is capable of forming the recessed part and/or the convex part of the steel plate engaging part into a substantially inverted trapezoidal shape in the radial direction,
When the steel plate engaging portion is formed on the pressed steel plate piece, when the die uneven portion engages with the steel plate engaging portion, the die uneven portion and the steel plate engaging portion engage with each other in the radial direction. Item 7. The laminated steel plate manufacturing apparatus according to item 7. A manufacturing method in which the pressed steel plate pieces are formed by the laminated steel plate manufacturing apparatus according to any one of claims 1 to 5, arranged in an annular shape to form the annular steel plate, and laminated to manufacture a laminated steel plate,
a first step of punching out the outer shape of the pressed steel plate piece in the first press section;
a second step of rotating the first die to arrange and connect the pressed steel plate pieces in an annular shape to form the annular steel plate;
The first step is a step of punching out the pressed steel plate piece N/M times,
When punching out the pressed steel plate piece for the first time, the auxiliary punch is set to the first state and the pressed steel plate piece held by the first die is pressed down to correct it,
When punching out the pressed steel plate piece from the second time to the N/Mth time, the auxiliary punch is set to the second state, and the vertical position of the pressed steel plate piece held by the first die is corrected. A method of manufacturing laminated steel plates that maintains the same condition. In the second step, the annular steel plate is formed by punching the pressed steel plate piece N/M times and rotating in one direction after punching,
The first die is rotated at an angle of 360/N degrees each time after the first to ((N/M)-1)th punching, and after the N/Mth punching, the first die is rotated at an angle of 360/(2×N degrees). 10. The laminated steel sheet manufacturing method according to claim 9, wherein the laminated steel sheet manufacturing method is rotated by an angle of .) degrees.

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