JP2005285852A - Laminated core and its manufacturing method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core comprising blanked steel plates with plural kinds of external diameters having a constitution suitable for an automatic blanking process by a progressive pressing apparatus, and also to provide its manufacturing method and apparatus. <P>SOLUTION: The laminated core is constituted such that a plurality of annular steel plates with a large external diameter and a plurality of annular steel plates with a small external diameter are laminated and fixed in combination. In the laminated core, a positioning hole for piercing a positioning structure through each annular steel plate of the laminated core is formed such that the position of a point closest to the center of the annular steel plate in the positioning hole is located above the radius of the annular steel plate of the small external diameter from the foregoing center to an internal diameter of the same, and below a radius from the foregoing center to a periphery on the circumference of an arbitrary radius not including the radius from the foregoing center to the internal diameter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a hollow disc or an annular steel plate in which an axial insertion hole is formed at the center of two types of discs having different outer diameters are formed by punching, and the annular steel plates are aligned while being laminated, so that the axial cross-section is The present invention relates to a laminated core configured to exhibit a letter shape, a manufacturing method therefor, and a manufacturing apparatus.

  In order to ensure dimensional accuracy, laminated cores manufactured on conventional production lines, such as inner cores, are made from a silicon steel rod as a raw material, and an annular groove with a U-shaped cross section is cut out using a processing machine such as a lathe. A through hole is formed at the center and cut into a predetermined width (see, for example, Patent Document 1).

  FIG. 9 shows a conventional integrated magnetic core. 9A is a front view, and FIG. 9B is a cross-sectional view taken along the line AA ′ in FIG. 9A.

  The magnetic core 200 in FIG. 9 is made of a magnetic material, and has an U-shaped cross section in the axial direction so that the magnet wire is wound along the annular shape, and the opening in the U-shaped shape extends from the axial center. A coil recess 201 configured to face radially outward; a caulking recess 202 formed on a side wall of the magnetic core 200 for fitting and fixing the magnetic core 200 to a counterpart device (not shown); and the coil In order to draw out the magnet wire wound around the concave portion for use, it is composed of two lead concave portions 203 formed on the outer peripheral end of the side wall of the magnetic core.

  In the case of this integrated magnetic core, many processes are required by many processing devices for cutting the final inner core from the silicon steel rod, and it takes time and processing time. Manufacturing methods were mainly used.

  Instead of the integrated magnetic core, a necessary number of die-cut silicon steel plates are stacked (see, for example, Patent Documents 2 and 3).

  FIG. 10 is a configuration diagram of a laminated core composed of a conventional outer annular steel plate and inner annular steel plate.

  10 (a) is a front view of the laminated core, FIG. 10 (b) is a cross-sectional view taken along the line BB ′ in FIG. 10 (a), and FIG. 10 (c) is an enlarged view in a circle in FIG. 10 (b). is there.

  The magnetic core 204 shown in FIG. 10 is made of a magnetic material such as a silicon steel plate, and is composed of two types of annular steel plates 205 and 206 having different outer diameters. The required number of caulks are fixed and stacked and connected together.

  The annular steel plate is composed of two types, an outer large outer diameter annular steel plate 205 and an inner small outer diameter annular steel plate 206. For example, in the example of FIG. 10, two outer large annular steel plates 205 are caulked and fixed to each other on both sides so as to sandwich a laminate of four inner small outer annular steel plates 206.

  The inner diameters (inner diameters) of the annular steel plates are all formed to the same diameter for convenience of mounting on the same shaft.

  The outer large-diameter annular steel plate 205 and the inner small-outer annular steel plate 206 are configured as shown in FIG.

  FIG. 11 is a configuration diagram and a main part enlarged view of a conventional annular steel plate.

  11 (a) is a front view of an outer annular steel plate having a large outer diameter, FIG. 11 (b) is a front view of an inner annular steel plate having a small outer diameter, and FIG. 11 (c) is a circle on the outer annular steel plate having a large outer diameter. FIG. 11D is an enlarged cross-sectional view of the vicinity of the dowel for caulking indicated by a circle on the inner annular steel plate having a small outer diameter and the outer annular steel plate having a large outer diameter.

  On the circumference of one side surface of the annular steel plate 205 having a large outer diameter, projecting portions 207 constituting four caulking portions are projected at predetermined intervals. As shown in FIG. 11 (d), the convex portion 207 is formed by stamping and forming so as to form a concave portion 208 on the other side surface of the steel plate. The convex portion 207 is fitted into the concave portion 208. As shown in FIG. 11C, an opening 209 is formed so as not to protrude from the side surface of the steel sheet only in one of the steel sheets at both ends of the laminated core.

  On the annular steel plate 206 having a small outer diameter, a convex portion 207 and a concave portion 208 that form four caulking portions at predetermined intervals on the circumference of the side surface are formed separately on both side surfaces. The number, shape, position and the like of the caulking portion are arbitrarily set.

  As an automatic manufacturing method related to a general laminated core including such an inner core, for example, a manufacturing method is known in which a stator core includes a stamping process using a progressive press as shown in FIG. 12 (for example, Patent Document 4). reference).

  FIG. 12 is an explanatory view of a method for manufacturing a stator core by a conventional progressive press.

  Fig. 12 (a) is a strip-shaped steel plate showing a punching process, Fig. 12 (b) is a plan view of a blanked punched steel plate, and Fig. 12 (c) is a cross-sectional view of the main part of a progressive press that performs a blank punching process of an outer diameter. It is.

  The steel plate 220 is first punched with a pilot hole 221 for positioning in the first step, as shown in FIG. 12A, by a progressive press machine (not shown) in the preceding process portion. The slot 222 is punched in the second step ((2) in FIG. 12 (a)), and the inner diameter hole 223 is punched in the third step ((3) in FIG. 12 (a)). Blanking of the outer diameter portion 224 is performed at ((4) in FIG. 12A). A blanked steel plate 232 from which the outer diameter portion has been blanked is shown in FIG.

  The blank punching process (fourth process) of the outer diameter part 224 will be described with reference to a cross-sectional view of the main part of the progressive press machine shown in FIG. On the left side of the fracture surface in FIG. 12 (c), a punching device (not shown: punch, etc.) corresponding to a series of steps along the length direction of the punched steel plate 220 shown in FIG. 12 (a) is connected. ing.

In the portion corresponding to the fourth step of the progressive press machine 225, an outer diameter punch 226 and a punch holder 227 for holding the outer diameter punch 226 so as not to be displaced are attached to the ram 228 so that the punched steel plate 220 is guided to the upper surface. The die 229 is provided in the die 229, and the laminated plate receiver 231 is guided in the insertion hole 230 of the die 229.
(Operation)
In the fourth step, the steel plate 220 is fed on the die 229 for one step so as to be wound around a winding drum (not shown). The ram 228 is lowered, the outer punch 226 punches the punched steel plate 220, and the blank punched punched steel plate 232 is punched first in the die 229 by the punching pressure by the outer punch 226 and stacked on the laminated steel plate receiving member 231. They are stacked on the punched steel plate 232, pressed onto the laminate of the punched steel plates 232 held in the die 229, and laminated in a semi-fitted state by dowels (convex portions) and openings (concave portions).

When this punching operation is finished, the ram 228 is raised and the steel plate 220 is fed one step.
Japanese Patent Laid-Open No. 09-191492 Japanese Patent Laid-Open No. 08-279424 Japanese Patent Laid-Open No. 10-271772 Japanese Patent Laid-Open No. 60-184431

  In the manufacturing method including the punching process by the conventional progressive press machine shown in FIG. 12, the punched steel plates 232 punched by the outer diameter punch 226 are stacked in the insertion hole 230 of the die 229. At that time, the punched steel plate 232 is aligned by aligning the outer surface of the circumferential portion of the punched steel plate 232 with the inner surface of the insertion hole 230.

  In this example, since the punched steel plate 232 has only one type of outer diameter, alignment is possible by the insertion hole 230 of the die 229. However, when the punched steel plate 232 is made of two types of punched steel plates, such as an outer annular steel plate with a large outer diameter and an inner annular steel plate with a small outer diameter, like the inner core, the punched steel plate with a large outer diameter is the die 229. Although it is possible to position by the insertion hole 230, the punched steel sheet having a small outer diameter has no counterpart for positioning.

For this reason, when the outer diameter of the punched steel plate 232 is different and there are two or more types, the punched steel plate 232 cannot be aligned in the die 229.

An object of the present invention is to provide a laminated core composed of a plurality of types of outer diameter punched steel sheets having a configuration suitable for an automatic punching process by a progressive press working apparatus, a manufacturing method therefor, and a manufacturing apparatus therefor.

  In order to achieve the above object, the laminated core of the present invention is a laminated core in which a plurality of large outer diameter annular steel plates and a plurality of small outer diameter annular steel plates are combined and secured, and each of the annular steel plates of the laminated core. In addition, the position of the alignment hole for inserting the alignment body is such that the position of the point closest to the center of the annular steel plate in the alignment hole is not less than the radius from the center to the inner diameter of the annular steel plate of the small outer diameter. It is formed so as to be on the circumference of an arbitrary radius not more than the radius from the center to the outer periphery and not including the radius from the center to the inner diameter.

  The manufacturing method of the laminated core is a manufacturing method of progressively pressing the strip-shaped steel plate, and the slit excluding the outer peripheral shape of the small outer diameter annular steel plate from the outer peripheral shape of the large outer diameter annular steel plate including the alignment hole, The step of slitting using a movable punch according to the stacking order, the outer diameter of the outer peripheral shape of the annular steel plate having a large outer diameter, the step of pushing back and fitting back, the guide member inserted through the alignment hole, It is characterized by caulking while removing the fitted punched steel sheet.

  The laminated core manufacturing apparatus is a manufacturing apparatus that progressively presses a strip-shaped steel sheet, and the outer periphery of a large outer diameter annular steel sheet including an alignment hole is changed from a peripheral shape of a small outer diameter annular steel sheet by a slit punch and a slit die. The slit excluding the shape is slit using a movable punch in accordance with the stacking order, and the outer diameter is removed by the outer peripheral shape of a large outer diameter annular steel plate by an outer diameter punch, an outer diameter die and a spring-biased push-up piston. And push-back to fit back, and the outer punch, outer die and side pressure cylinder are used to guide and insert the punched steel sheet that has been fitted back using a guide member inserted into the alignment hole. It is characterized by that.

  In addition, the manufacturing method and manufacturing apparatus of a lamination | stacking core can also divide | segment the other method and apparatus demonstrated below for every process, and can also set it as a new method and apparatus by combining suitably.

In particular,
(1) The laminated core is a laminated core in which a plurality of large outer diameter annular steel plates and a plurality of small outer diameter annular steel plates are combined and fixed.
An alignment hole for inserting an alignment body into each annular steel plate of the laminated core, and the position of the point closest to the center of the annular steel plate in the alignment hole is the center in the annular steel plate having the small outer diameter. It is formed so as to be on the circumference of an arbitrary radius not less than the radius from the center to the outer periphery and not more than the radius from the center to the outer periphery and not including the radius from the center to the inner diameter.
(2) The laminated core according to (1) is characterized in that the arbitrary radius is a radius from the center to the outer periphery of the annular steel plate having a small outer diameter.
(3) The laminated core according to (1) or (2) is characterized in that the alignment hole has a shape in which the periphery of the alignment hole is closed.
(4) The laminated core according to (1) or (2) is characterized in that the alignment hole is a circular hole.
(5) The laminated core according to (1) or (2) is characterized in that the alignment hole is a U-shaped hole whose periphery is opened to the outer periphery.
(6) The laminated core according to any one of (1) to (5) is characterized in that the alignment holes are annularly arranged at a predetermined interval.
(7) The laminated core according to (6) is characterized in that three alignment holes are provided.
(8) The manufacturing method of the laminated core is a manufacturing method of progressively pressing a strip-shaped steel plate, and the step of removing the inner diameter, from the outer peripheral shape of the large outer diameter annular steel plate including the alignment hole to the small outer diameter annular steel plate The process of slitting the slit excluding the outer peripheral shape using a movable punch according to the stacking order, the outer diameter of the outer peripheral shape of a large outer diameter annular steel plate, the step of pushing back and fitting it back, the punched steel plate fitted back A method of manufacturing a laminated core, comprising: a step of caulking while pulling out, and caulking while pulling out the fitted punched steel plate using a guide member inserted through the alignment hole.
(9) The laminated core manufacturing apparatus is a manufacturing apparatus that progressively presses a strip-shaped steel plate, from the outer peripheral shape of an annular steel plate having a large outer diameter including an inner diameter punch and an inner diameter die for aligning the inner diameter, and an alignment hole. Slits excluding the outer peripheral shape of the small outer diameter annular steel plate are removed with the slit punch and slit die for slitting using a movable punch according to the stacking order, and the outer shape of the large outer diameter annular steel plate. , While pulling out the reinserted punched steel sheet using an outer diameter punch, an outer diameter die, a spring-biased push-up piston, and a guide member inserted into the alignment hole. It comprises an outer diameter punch for crimping, an outer diameter die, and a side pressure cylinder.
(10) The manufacturing method of the laminated core is a manufacturing method of progressively pressing a strip-shaped steel plate, a step of removing the inner diameter at the same time as removing the inner diameter or aligning holes, removing the outer diameter with a small outer diameter, or large outer diameter. The method comprises a step of sequentially laminating and caulking and fixing the punched steel sheet while aligning the punched steel plate.
(11) An apparatus for manufacturing a laminated core includes an inner diameter punch having an inner diameter punch and a positioning hole punching punch connected in series so as to be linearly movable, an inner diameter die having an alignment hole, and a straight line A small outer diameter punch and a large outer diameter punch connected in series so that they can move, a small outer diameter die and a large outer diameter die connected in series so that they can move linearly, and below the small outer diameter die or the large outer diameter die A laminated steel plate receiving mechanism that is provided below the belt-shaped steel plate and supports the punched steel plates so that they can be sequentially laminated and caulked and fixed, and an alignment mechanism that aligns the punched steel plates.

  The laminated core of the present invention is a laminated core obtained by laminating and fixing a plurality of annular steel plates having a large outer diameter and a plurality of annular steel plates having a small outer diameter, and inserting an alignment body into each annular steel plate of the laminated core. The position of the alignment hole for the point closest to the center of the annular steel plate in the alignment hole is greater than or equal to the radius from the center to the inner diameter of the annular steel plate of the small outer diameter and less than the radius from the center to the outer periphery. In addition, since it is formed so as to be on the circumference of an arbitrary radius that does not include the radius from the center to the inner diameter, the punched steel sheets having different outer diameter sizes are aligned together using a simple configuration alignment body. Will be able to. Further, the punched steel sheet having a small outer diameter can be aligned on the outer periphery without any special processing.

  Since the alignment holes are arranged at a predetermined interval and along the annular shape of the annular steel plate, even if the number of alignment holes is small, alignment can be performed easily and accurately with the holes. Furthermore, since the alignment hole is provided in the outer annular steel plate constituting the laminated core, it can be assembled by a simple manufacturing method in which alignment is performed using the alignment body at the time of punching with a press. In particular, by setting the number of alignment holes to three, accurate alignment can be easily performed with the minimum number of holes.

  The manufacturing method of the laminated core is a manufacturing method of progressively pressing a strip-shaped steel plate, and the outer peripheral shape of the annular steel plate having a small outer diameter is changed from the outer peripheral shape of the annular steel plate having a large outer diameter including the alignment hole to the step of removing the inner diameter. The process of slitting the removed slit using a movable punch according to the stacking order, the outer diameter of the outer peripheral shape of the annular steel plate with a large outer diameter, the step of pushing back and fitting, the punched steel plate fitted back In the manufacturing method comprising the steps of caulking, since the punched steel plate that has been fitted back is pulled out using a guide member that is inserted into the positioning hole, the annular steel plates having different outer diameters are easily aligned. Using the body, it is possible to manufacture the finished product easily by aligning and stacking simultaneously with the punching.

  The laminated core manufacturing apparatus is a manufacturing apparatus that progressively presses strip-shaped steel sheets, from an outer peripheral shape of an annular steel sheet having a large outer diameter including an inner diameter punch and an inner diameter die for aligning the inner diameter to a small outer diameter. The slit excluding the outer peripheral shape of the annular steel plate is punched out by the slit punch and slit die for slitting using a movable punch according to the stacking order, and the outer peripheral shape of the large outer diameter annular steel plate, and push back An outer diameter punch for fitting back, an outer diameter die and a spring-biased push-up piston, and a guide member inserted into the alignment hole for caulking while removing the fitted steel plate Because it consists of an outer diameter punch, an outer diameter die, and a side pressure cylinder, annular steel sheets with different outer diameters are aligned simultaneously with punching using a simple alignment body. Laminating Te, it becomes possible to easily produce a finished product.

  The manufacturing method of the laminated core is a manufacturing method in which a strip steel plate is subjected to progressive press processing, in which the inner diameter is removed simultaneously with the inner diameter removal or the alignment hole removal, the outer diameter removal with a small outer diameter or the outer diameter with a large outer diameter. Since it consists of a process of laminating and stacking and caulking and fixing sequentially while aligning the punched steel plates, align the annular steel plates with different outer diameters at the same time as punching using a simple alignment body Laminated and can easily produce a finished product.

  The laminated core manufacturing apparatus is capable of linearly moving an inner diameter punch having an inner diameter punch and an alignment hole punching punch connected in series so as to be linearly movable, and an inner diameter die having an alignment hole. A small outer diameter punch and a large outer diameter punch connected in series to each other, a small outer diameter die and a large outer diameter die connected in series so as to be linearly movable, and a strip steel plate below the small outer diameter die or the large outer diameter die. It consists of a laminated steel plate receiving mechanism that is provided below and supports the punched steel plates so that they can be laminated and caulked and fixed, and a positioning mechanism that aligns the punched steel plates. Using the body, it is possible to manufacture the finished product easily by aligning and stacking simultaneously with the punching.

  The present invention is suitable for manufacturing by progressive press working, and has a plurality of different outer diameters (outer diameters) (for example, a large outer diameter (referred to as large outer diameter) and a small outer diameter (referred to as small outer diameter)). For laminated cores constructed by laminating annular (doughnut-shaped) punched steel plates, a large outer diameter punched steel plate is provided with an alignment hole through which the alignment body is inserted, and the outer peripheral surface of the small outer diameter punched steel plate or its outer periphery A hole extending radially outward from a position on the circumference closer to the center than the surface and having a hole through which an alignment body for aligning the punched steel sheets having a large outer diameter and a small outer diameter can be inserted is provided. The laminated core and the manufacturing method therefor are characteristic.

  The hole through which the alignment body can be inserted is a circular hole, an elliptical hole, a square hole, or a hole in which the periphery of the hole is opened to the outer periphery. Any shape such as a letter-shaped hole can be adopted.

  The core is a laminated core composed of a punched steel sheet having a large outer diameter and a small outer diameter, and the embodiment will be described using, for example, an inner core for transformer winding in a resolver.

  FIG. 1 is a configuration diagram of an inner core provided with a circular alignment hole suitable for manufacturing by automatic progressive pressing according to the present invention. 1A is a front view, FIG. 1B is an oblique side view, and FIG. 1C is a front view of an example in which the position of the circular alignment hole is changed.

  The laminated core is composed of a combination of a large (large) outer diameter steel sheet and a plurality of small (small) outer diameter steel sheets.

  Example 1 in FIG. 1 is a large outer ring in which a plurality of large outer ring steel plates 16 and 17 are stacked on both sides of a small outer ring steel plate stack in which a plurality of small outer ring steel plates 18 are stacked. The steel sheet laminate is configured to be fixed so that the inner side surface 19 defining the inner periphery is aligned. At that time, the steel plates are fixed to each other by fitting the convex portions formed as caulked portions (doughs) on the front and back surfaces of the steel plates and the openings of the steel plates at the end portions.

  The example of FIGS. 1A and 1B shows an example in which a position 15 near the steel plate center of the circular alignment hole 11 is positioned at a position in contact with the outer periphery 13 of the annular steel plate 18 having a small outer diameter.

  When the large outer diameter annular steel plates 16 and 17 are punched, the large outer diameter annular steel plates 16 and 17 extend radially outward from positions on the circumference corresponding to the outer periphery 13 of the small outer diameter annular steel plate 18. A circular alignment hole 11 is formed. The circular alignment hole 11 has a shape extending radially outward from a position on the circumference corresponding to the outer periphery 13 of the annular steel plate 18 having a small outer diameter inside the annular steel plates 16 and 17 having a large outer diameter. In that case, the shape of a radius of any size can be taken. The number of the circular alignment holes 11 can be set to any number as long as it is provided at a position on the circumference corresponding to the outer circumference of the small outer diameter annular steel plate 18. However, since the number of alignment holes 11 increases as the alignment error increases, the number of alignment holes 11 is determined in consideration of the accuracy of three or more. Preferably, the number of alignment holes is three and is provided at the apex position of a regular triangle.

  The alignment hole 11 is used to insert and position a positioning body (not shown) in the outer large-diameter annular steel plates 16 and 17 when the steel plate is punched by a press working apparatus. It is used to position the positioning body in contact with the outer periphery 13 of the annular steel plate 18.

  In the case of FIG.1 (c), it comprises so that the outer periphery 13 of the annular steel plate 18 of a small outer diameter may come to the approximate center of the alignment hole 11 of the said FIG.1 (a) (b). That is, half of the alignment hole 11 penetrating through both the large outer diameter annular steel plates 16 and 17 is formed closer to the center from the outer periphery 13 of the small outer diameter annular steel plate 18, and the other half of the alignment hole 11 is small outside. Apparently formed radially outward from the outer periphery 13 of the annular steel plate 18 having a diameter.

  Both examples described above, in which the position of the circular positioning hole 11 in FIG. 1 is changed, are not different in that they have a positioning effect on both annular steel plates, but the example in FIG. 1 (c) has a smaller outer diameter. Positioning accuracy is high because there is no rotation of the annular steel plate.

  The position 15 near the center of the steel plate of the alignment hole 11 is not more than the radius from the center 12 to the outer periphery 13 of the annular steel plate 18 having a small outer diameter, and is not less than the radius from the center 12 to the inner periphery 14 and from the center 12 to the inner periphery 14. It is provided on the circumference of an arbitrary radius not including the radius of. As a result, the inner periphery 14 of the small outer diameter annular steel plate 18 is not divided by the alignment hole 11, so that the annular configuration remains on the inner periphery 14 side of the small outer diameter annular steel plate 18 and maintains the overall shape. become able to. Furthermore, the alignment hole 11 only needs to have a small dimension that allows the alignment body to be inserted, and in particular, has a small shape enough to completely enter between the inner periphery 14 and the outer periphery 13 of the annular steel plate 18 having a small outer diameter. Is preferred.

  FIG. 2 is a configuration diagram of an inner core provided with a U-shaped alignment hole suitable for manufacturing by automatic progressive pressing according to the present invention. 2A is a front view, FIG. 2B is an oblique side view, and FIG. 2C is a front view of an example in which the position of the U-shaped alignment hole is changed.

  Example 2 in FIG. 2 is similar to Example 1 in FIG. 1 on both sides of a small outer diameter annular steel plate laminate in which a plurality of small outer diameter annular steel plates 28 are laminated. A large-diameter annular steel plate laminate in which a plurality of 27 are laminated is fixed so that the inner side surface 29 is aligned. At that time, the annular steel plates are fixed to each other by fitting the convex portions formed as caulked portions (doughs) on the front and back surfaces of the annular steel plates and the openings of the annular steel plates at the end portions.

  2A and 2B show an example in which a position 25 close to the center of the U-shaped alignment hole 21 is positioned closer to the center than the outer periphery 23 of the small outer diameter annular steel plate 28. FIG.

  At the time of punching the outer large-diameter annular steel plates 26 and 27, a position slightly inward in the radial direction from the position on the circumference corresponding to the outer periphery 23 of the small outer-diameter annular steel plate 28 on the large outer-diameter annular steel plates 26 and 27. A U-shaped alignment hole 21 extending outward from (a position not exceeding the inner side surface 29) is formed.

  The shape of the U-shaped alignment hole 21 is such that the outer large outer diameter annular steel plates 26 and 27 and the inner small outer diameter annular steel plate 28 are positioned closer to the center in the radial direction than the outer peripheral surface of the inner small outer diameter annular steel plate. Any shape that extends radially outward from (a position that does not exceed the inner surface) and opens to the outer surface of the outer periphery can be employed. The number of U-shaped alignment holes 21 can be set to any number as long as it is provided at a position on the circumference corresponding to the outer circumference of the annular steel plate 28 having a small outer diameter. However, since the number of alignment holes 21 increases as the alignment error increases, the number of alignment holes 21 is determined in consideration of the accuracy of three or more. Preferably, the number of alignment bodies is three and is provided at the apex position of a regular triangle.

  The U-shaped alignment hole 21 engages a positioning body (not shown) with the outer large outer diameter annular steel plates 26 and 27 and the inner smaller outer diameter annular steel plate 28 when the steel plate is punched by a press working device. And used for positioning.

  In the case of FIG. 2C, the position 25 close to the center of the alignment hole 21 in FIGS. 2A and 2B is configured to be on the outer periphery 23 of the annular steel plate 28 having a small outer diameter.

  The two examples in which the position close to the center of the U-shaped alignment hole 21 in FIG. 2 is changed in that there is a positioning effect of both annular steel plates, but the examples in FIGS. Positioning accuracy is high because there is no rotation of the small outer diameter annular steel plate.

  Further, the U-shaped alignment hole 21 of Example 2 is easier to arrange and attach the positioning body than the round shape of Example 1 in that the U-shaped alignment hole 21 is opened on the outer peripheral surfaces of both steel plates.

  The position 25 close to the steel plate center 22 of the alignment hole 21 is less than or equal to the radius from the center 22 to the outer periphery 23 of the annular steel plate 28 with a small outer diameter, and is greater than or equal to the radius from the center 22 to the inner periphery 24 and from the center 22 to the inner periphery 24. It is provided on the circumference of an arbitrary radius not including the radius up to. As a result, the inner circumference of the small outer diameter annular steel plate 28 is not divided by the alignment hole 21, so that the annular configuration remains on the inner circumference side of the small outer diameter annular steel sheet 28 so that the entire shape can be maintained. become.

  FIG. 3 is a specific structural diagram of an inner core having an outer annular steel plate provided with a U-shaped alignment hole of the present invention. 3A is a front view seen from the outer annular steel plate in the laminated inner core, FIG. 3B is a cross-sectional view taken along the line AA ′ in FIG. 3A, and FIG. 3C is FIG. It is a principal part enlarged view of b), and is an expanded sectional view of an alignment hole. In Example 2, as shown in FIG. 3 (c), the inner core has two outer large annular steel plates 26 and 27, four outer annular steel plates 28, and two outer layers. The large-diameter annular steel plates 26 and 27 are integrated by caulking in the order of lamination.

  FIG. 4 is a configuration diagram of an outer large outer-diameter annular steel plate and a small outer-diameter inner annular steel plate provided with a U-shaped alignment hole of the present invention, and a caulking fixing means thereof.

  4 (a) is a front view of the outer large-diameter annular steel plate, FIG. 4 (b) is a front view of the inner small outer-diameter annular steel plate, and FIG. 4 (c) is a dotted line in FIG. 4 (a). FIG. 4D is an enlarged cross-sectional view of an example of a convex portion and a concave portion of a caulking portion surrounded by a dotted line in FIGS. 4A and 4B.

  On the side surface of the inner small outer diameter annular steel plate 31 shown in FIG. 4 (b), a concave portion 33 is provided on the side surface opposite to the convex portion 32 constituting the caulking portion on one side surface by the extrusion processing of the punch in the progressive press process. . The convex part 32 fits into the concave part 33.

  On the side surface of the outer large-diameter annular steel plate 34 shown in FIG. 4 (a), the caulking portion shown in FIG. 4 (c) is located at a position corresponding to the caulking portion provided on the inner small outer-diameter annular steel plate 31. The convex part 32 and the concave part 33 of the opening 35 or the caulking part shown in FIG. The opening example of FIG. 4C is placed at the beginning or the end when the steel plates are laminated.

  The outer large annular steel plate 34 shown in FIG. 4A is provided with three U-shaped alignment holes 21 at equal intervals on the outer periphery. The U-shaped alignment hole 21 is open to the outer peripheral surface, and an arbitrary position (from the center to the inner side) from a position corresponding to the outer periphery of the annular steel plate 31 having a small outer diameter on the inner side to a position not exceeding the inner periphery. From the radius value to the circumference to the radius value from the center to the outer circumference, the radius is set to an arbitrary value on the circumference (except for the radius value from the center to the inner circumference). Accordingly, when forming a laminated core in which a plurality of large (large) outer diameter annular steel plates 34 and a plurality of small (small) outer diameter annular steel plates 31 are laminated and fixed, alignment with the large outer diameter annular steel plate 34 is performed. A hole 21 is provided, and an outer surface of the annular steel plate 31 having a small outer diameter or a U-shaped surface that is the same shape as the partial shape of the alignment hole 21 provided on the outer surface is a part of the inner surface of the alignment hole 21. And alignment in the stacking direction of the stacked core.

  The inner surface of the bottom of the U-shaped alignment hole close to the center of the steel plate is the outer surface of the inner small outer diameter annular steel plate or the groove surface having the same shape as the partial shape of the alignment hole provided on the outer surface. Since it is aligned, this U-shaped, especially an alignment body (not shown) having a vertical line or a horizontal plane at the bottom, for example, a pin, a rod-shaped body, a strip-shaped body, etc. having the same radius everywhere, comes into contact with this position. By aligning the inner small outer diameter annular steel plate so that the outer peripheral surface or a groove having the same shape as the partial shape of the alignment hole is in contact with the mating body, the outer large outer diameter annular steel plate and the inner small outer diameter are aligned. An annular steel plate having a diameter can be aligned.

  As the alignment body, any shape can be used as long as it has a vertical line or a horizontal plane. The number and arrangement of the caulking portions can be any number and arrangement as long as they are balanced.

FIG. 5 is a view showing a manufacturing process of an inner core having a U-shaped alignment hole according to the present invention as a stamping process of a strip steel plate.
(1) Pilot removal step Positioning pilot holes 41 are formed in the strip steel plate 40.
(2) Inner diameter removing step The inner diameter hole 42 for attaching the inner core to the rotating shaft is pressed.
(3) Punch movable slit removal process A punch (not shown) provided with a slit blade that divides a circular arc into approximately three parts is movably provided in an upper ram (not shown), and a small outer diameter ring inside the inner core. When forming a steel plate (annular steel plate having a small outer diameter), the blade is moved to a position facing the strip-shaped steel plate 40 to punch out the slit 43, and a large outer diameter annular steel plate (with a large outer diameter) outside the inner core. When the steel plate is formed, the blade is moved to a position off the strip steel plate 40 so that nothing is punched out.
The difference between these two punchings appears as a steel plate having a different outer diameter in the subsequent outer diameter punching process.
(4) Inner diameter surface striking step The inner diameter removed portion of the step (2) is ground.
(5) Punch movable Dowel hole and dowel forming step A punch (not shown) for forming a dowel positioning hole and a dowel punch (not shown) are provided movably in an upper ram (not shown). Eight dowel positioning holes 44 and dowel holes 45 are formed in order.
(6) Outer diameter punching (pushback) step Using the dowel hole 45 as a reference, an outer diameter punch (not shown) is used to punch out the outer shape 46 of the outer annular steel plate having a large outer diameter.
As a result, the strip-shaped steel plate 40 in which the slit 43 is punched in the step (3), when the outer diameter is removed in this step, the slit 43 and the current U-shaped alignment hole 47 are connected, and the inner small outer It is punched along the outer peripheral shape 48 of the annular steel plate having a diameter.
In addition, the strip-shaped steel plate 40 that has not punched the slit 43 in the step (3) is punched along the outer peripheral shape 49 of the outer large outer-diameter annular steel plate when the outer diameter is removed in this step.

  When the upper die, that is, the outer diameter punch is returned after punching, the annular steel plate punched out by a spring-biased push-up piston (not shown) that follows the outer diameter punch returns and the small size in the strip steel plate 40 is returned. It fits and is fixed to the punched hole of the annular steel plate 48 of the outer diameter or the punched hole of the annular steel plate 49 of the large outer diameter. In the case of an annular steel plate having a large outer diameter, it is fitted and fixed to the punched hole on the entire outer periphery. On the other hand, in the case of an annular steel plate having a small outer diameter, it is fitted and fixed to the punched hole by a U-shaped convex portion (the strip-shaped steel plate side) corresponding to the U-shaped alignment hole 47.

  This will be specifically described.

FIG. 6 is a diagram showing a punching die of the outer diameter punching (pushback) process and the dropping / caulking process of the present invention. 6A is a bottom view of the upper die of the outer diameter extraction (pushback) process, FIG. 6C is a top view of the lower mold of the outer diameter extraction (pushback) process, and FIG. A bottom view of the upper mold of the caulking process, and FIG. 6C is a top view of the lower mold of the dropping and caulking process.
FIG. 7 is a cross-sectional view of a press working apparatus corresponding to the outer diameter punching (pushback) process and the dropping / caulking process of the present invention.
In the outer diameter removal (pushback) step, the lower mold 51 is constituted by a die 1 (53) and a push-up piston 54 provided in the holder 52.

  The die 1 (53) is configured such that a cross section parallel to the moving plane of the steel plate forms a substantially cylindrical space having a shape matching the outer peripheral shape of the annular steel plate having a large outer diameter. In the substantially cylindrical space, a U-shaped alignment protrusion 55 formed along the substantially cylindrical space and corresponding to the U-shaped alignment hole of the outer peripheral shape protrudes toward the center. Yes.

  The push-up piston 54 is guided by the U-shaped alignment protrusion 55 and is provided so as to move up and down in the space. The push-up piston 54 is urged by a spring 56 and functions to push back the punched steel plate. The piston 54 is provided with an appropriate number of dowel receiving holes 59 that engage with dowel (caulking portion) positioning pins 58 provided in the upper die 57.

  The upper die 57 is constituted by fixing an outer diameter punch 1 (60) matched to the outer peripheral shape of a large outer diameter annular steel plate to a ram 61 with a bolt 62 or the like. The outer diameter punch 1 (60) is provided with a U-shaped alignment groove 63 on the side surface, and an appropriate number of dowel positioning pins 58 aligned with the dowel receiving holes 59 of the lower die 51.

From this state, the strip steel plate 64 on the holder 52 is moved and positioned. When the upper die 57 is lowered, the tip of the dowel positioning pin 58 is guided to the dowel receiving hole 59 of the lower die 51 through the dowel hole of the strip steel plate 64 being processed. In this manner, the punched steel sheet is punched to the outer diameter by the outer diameter punch 1 (60) while being guided by the dowel positioning pin 58. Since the push-up piston 54 is urged upward by the spring 56, the punched steel plate once punched from the strip-shaped steel plate 64 is once moved to the corresponding opening of the strip-shaped steel plate 64 by the return force of the spring 56. Returned and fitted and fixed.
(7) Pull-out and caulking step The annular steel plate fitted and fixed in the punching hole in the previous step is pulled out by the press working apparatus shown in FIGS. 6 and 7 and caulked and fixed at the same time.
(Dropping and caulking process)
The lower die 51 is formed with a cylindrical hollow portion perpendicular to the holder 52, and a hollow die 2 (65) is provided above the hollow portion so as to open at the upper end, and is continuous with the die 2 (65). A hollow side pressure cylinder 66 is provided, a hollow lowering holding cylinder part 67 comprising the holder 52 is arranged following the side pressure cylinder 66, and a payout part 68 is provided below the lowering holding cylinder part 67.
A guide member 69 is provided at an end of the die 2 (65) facing the upper mold 57. The guide member 69 is provided for aligning the annular steel plates so that the punched annular steel plates can be laminated and crimped together. In the third embodiment, the guide member 69 has a convex cross section and an appropriate length in the downward direction of the outer diameter punch 2 (70) so as to align with the U-shaped alignment hole of the punched annular steel plate. ing. The guide member 69 is basically configured according to the shape of the alignment hole.

  The side pressure cylinder 66 is formed to have a diameter slightly smaller than the outer diameter of the punched annular steel plate, and increases the contact resistance so that it does not fall moderately from the side edge onto the annular steel plate that is drawn into the die 2 (65) and sequentially descends. It exerts a force and is caulked and fixed in a laminated state by the convex portion of the caulking portion (dough) formed on the annular steel plate and the opening of the concave portion or caulking portion formed on the back surface thereof.

  The laminated core that is caulked and laminated while passing through the die 2 (65) or the side pressure cylinder 66 hangs down to the lowering holding cylinder part 67 having a diameter somewhat larger than the diameter of the annular steel plate. The laminated core that hangs down the descending holding cylinder portion 67 falls to the payout portion 68.

  When the laminated steel sheet detector 72 detects the lowering laminated core and outputs a detection signal, the payout controller 71 operates the payout device 73 and pays out accordingly.

  In the upper mold 57, the outer diameter punch 2 (70) to be inserted into the die 2 (65) is fixed to the ram 61 with bolts 74. The outer diameter punch 2 (70) is provided with an appropriate number of dowel positioning pins 75 that align with the dowel receiving holes of the caulked portion of the laminated core that is held by friction in the lower mold 51, and the outer peripheral shape of the outer diameter punch 2 (70) It is adapted to the outer peripheral shape of the annular steel plate. The outer peripheral shape of the outer diameter punch 2 (70) is provided with a U-shaped alignment groove 63 on the side surface in the same manner as the outer peripheral shape of the outer diameter punch 1 (60) in FIG.

  In this state, when the strip steel plate 64 is moved and positioned by one step and the outer diameter punch 2 (70) is pushed down, the punched steel plate is guided by the convex guide member 69 with its U-shaped alignment hole. Then, the sheets are stacked and crimped while passing through the die 2 (65) and the side pressure cylinder 66, and then passed through the lowering holding cylinder part 67 and lowered to the dispensing part 68.

The important point is that the inner core of the embodiment of the present invention has a special configuration in that it has two types of shapes, an outer large-diameter annular steel plate and an inner small outer-diameter annular steel plate.
That is, the inner diameters of the die 2 (65) and the side pressure cylinder 66 are made slightly smaller than the outer diameter of the outer annular steel plate having a large outer diameter. While the cylinder 66 is stopped by friction with its inner surface, it does not descend unless it is pushed down by the upper mold 57. On the other hand, the outer diameter of the annular steel plate having a small outer diameter is smaller than the inner diameters of the die 2 (65) and the side pressure cylinder 66, and as such, will drop to the payout portion 68.

  As an order of punching, first, a required number of outer annular steel plates having large outer diameters are punched out, and are stacked and crimped in the die 2 (65) and the side pressure cylinder 66. Next, while positioning with the dowel positioning pin 75 of the upper die 57, the outer diameter punch 2 (70) is pushed down, the inner small outer diameter annular steel sheet is punched out, and the large outer diameter annular steel sheet is laminated and crimped. The next small outer diameter annular steel sheet is laminated and crimped in the same manner as the previous small outer diameter annular steel sheet. Thereafter, the large outer diameter annular steel plate is again laminated in the same manner on the small outer diameter annular steel plate or the large outer diameter annular steel plate to form a laminated core. Finally, it is pushed and descends to the lower payout section 68.

  In the above embodiment, the inner core having a U-shaped alignment hole has been described. However, the present invention can be similarly applied to an inner core having other circular alignment holes.

  FIG. 8 is an explanatory view for explaining a progressive press working method automatically performed according to the present invention. 8A is a vertical sectional view taken along the line AA ′ in the horizontal sectional view of the upper mold in FIG. 8C, and DD ′ in the horizontal sectional view of the lower mold in FIG. 8D. FIG. 8B is a plan view of a steel sheet punched by an automatic progressive press machine comprising FIGS. 8A, 8C, and 8D, and FIG. 8C is FIG. FIG. 8D is a horizontal sectional view taken along line BB ′ in FIG. 8A, and FIG. 8D is a horizontal sectional view taken along line CC ′ in FIG.

  Since the inner core of Example 4 is composed of two types of punched annular steel plates, an annular steel plate having a large outer diameter (the outer diameter having a relatively large outer diameter) and a small outer diameter (the one having a relatively smaller outer diameter). The punching process of the annular steel plate having the outer diameter will be described.

  8 (a), (c), and (d) show a processing step portion for punching the two types of outer diameter annular steel plates of the progressive pressing device in all the steps. A step (not shown) for forming a convex portion, a concave portion and an opening of a caulking portion for caulking and fixing a punched steel plate is provided in the preceding stage of these illustrated steps. In addition, an arbitrary processing device part can be provided before the processing device part as necessary.

In the progressive press processing apparatus, a punch holder 82 having various punches in an upper die 80 is fixed to a ram 83, and various dies are fixed to a die holder 84 in a lower die 81 and arranged opposite to each other. Each punch is slidably attached to the punch holder 82 and each die is attached to the die holder 84 by a moving device (not shown).
(Upper mold)
A cylindrical large outer diameter punch 85 for punching a large outer diameter annular steel plate is fixed to a rectangular parallelepiped substrate 86 as shown in FIGS. A cylindrical small outer diameter punch 87 for punching a small outer diameter annular steel plate is fixed to a rectangular parallelepiped substrate 88 as shown in FIGS. The substrate 86 and the substrate 88 are connected at one side as shown in FIG. 8C, and are slidable in the direction of the arrow by a moving device (not shown). The moving device is composed of a linear moving device using a motor, a solenoid, a hydraulic device or the like as a drive source.

The substrate 86 and the substrate 88 connected to each other are held by the punch holder 82 and the ram 83 so that the large outer diameter punch 85 and the small outer diameter punch 87 do not fall in FIG. The punch holder 82 is guided so as to be slidable in the vertical direction in FIG. 8C.
A connection body in which the substrate 89 and the substrate 90 are connected on one side in parallel with the connection body of the substrate 86 and the substrate 88 is also provided and held by the punch holder 82 and the ram 83. On the substrate 89, a cylindrical inner diameter punch 91 and three cylindrical alignment hole punches 92 are arranged around the inner diameter punch 91 at predetermined intervals. The cross-sectional shape of the alignment hole punch 92 is circular in the fourth embodiment, but may take any other shape such as a quadrilateral, a triangle, and an ellipse. An inner diameter punch 93 having the same shape as the inner diameter punch 91 is provided on the substrate 90 at the same position with respect to the same shape substrate 90. The substrate 89 and the substrate 90 are connected at one side as shown in FIG. 8C, and are slidable in the direction of the arrow by a moving device (not shown). The connected substrate 89 and substrate 90 are held by the punch holder 82 and the ram 83 so that the inner diameter punches 91 and 93 and the alignment hole punch 92 are not dropped in FIG.
(Lower mold)
The die holder 84 is mainly provided with various dies, a laminated plate receiving mechanism 100, and an alignment mechanism 101. As a die, as a left side process (preceding process) not shown in FIGS. 8A, 8C, and 8D, a die for forming a pilot hole 95 in a steel sheet, and a steel sheet are laminated and caulked. A die for the step of forming the concave portion and the convex portion constituting the caulking portion is provided in a predetermined relationship. After these steps, dies for an inner diameter punching process and an outer diameter punching process shown in FIGS. 8A, 8C, and 8D are sequentially provided. The die for the inner diameter punching process includes an inner diameter die 96 formed on the die substrate 98 and an alignment die 97 disposed around the inner periphery die in a predetermined positional relationship. In this case, there are two types of punches for the inner diameter punching process, one with and without the alignment punch, but there is no problem even if the alignment die is not used. What is necessary is just to provide what provided the die | dye.

  The portion constituting the outer diameter die includes a die substrate 98, a sliding plate die 99, a laminated plate receiving mechanism 100, and an alignment mechanism 101.

The die substrate 98 includes a steel plate removal space 102 formed in a structure that can accommodate a large outer diameter punch in the die substrate 98, and a surface of the die substrate 98 connected to the space 102 and in contact with the steel plate. A rectangular groove having a certain depth, that is, a sliding groove is formed in parallel with the surface. A sliding plate die 99 that moves linearly is slidably provided in the sliding groove. The steel plate removal space 102 is also provided in the die holder 84 as appropriate. The sliding plate die 99 has a large outer diameter die 103 and a small outer diameter die 104 as shown in FIG. It is connected in the sliding direction.
The laminated plate receiving mechanism 100 includes a laminated plate receiver 105 and a moving operation rod 106. The laminated plate receiver 105 is formed of a plate having a surface area that is not less than the opening area of the small outer diameter die 104 and not more than the opening area of the large outer diameter die 103.

  By inserting the moving operation rod 106 into the through-hole 107 of the die holder 84 and adjusting the movement up and down, the punched steel plate is received from the lower side, and the crimped portion of the steel plate punched by the pressing force of the punch when the steel plate is punched. The protrusion is supported from the bottom of the laminated plate so as to be fitted into the concave portion of the caulking portion of the steel plate already punched and laminated. The height of the laminated plate receiver 105 from the upper surface of the die holder 84 is controlled so as to decrease as the number of punched steel plates increases. However, at the stage where the laminated core is completed, for example, the moving operation bar moves up and returns to the initial state.

  The alignment mechanism 101 includes an alignment rod 108 and a return spring 109. The alignment bar 108 is composed of three vertical bar portions 110 arranged vertically and in parallel, and a horizontal bar portion 111 connecting the vertical bar portions 110, and the horizontal bar portion 111 forms a triangle. However, the horizontal bar portion 111 may be formed in an arbitrary shape, for example, a disk shape or an annular shape, as long as the vertical bar portions 110 can be connected to each other. The spring 109 is disposed between the die holder 84 and the laminated plate receiver 105. The interval between the vertical bar portions 110 is set to the interval between the alignment hole punch 92 and the die 97 shown in FIGS.

The moving operation rod 106 is controlled in accordance with the process by a control device that controls the entire press working apparatus. The control device can be constituted by a microcomputer. The control device controls the press working device so that the press working is automatically performed by built-in software.
(Punching action)
The laminated steel plates constituting the inner core are laminated in the order of a plurality of outer large annular steel plates, a plurality of inner small outer annular steel plates, and a plurality of outer large outer annular steel plates. Steel plates are punched in this stacking order.

  Therefore, first, the moving device (not shown) is controlled to position the substrate 89 provided with the inner diameter punch 91 and the alignment hole punch 92 and the substrate 86 provided with the large outer diameter punch 85 in the punch holder 82. At the same time, the large outer diameter die 103 is positioned by sliding the sliding plate die 99 on the die substrate 98.

  Next, after forming a pilot hole 95 and a convex portion or a concave portion constituting a caulking portion on the steel plate, a circular inner diameter hole is punched out by an inner diameter punch 91 and an inner diameter die 96, and at the same time, an alignment hole punch 92 and an alignment die are formed. The alignment hole is punched by 97. In the next step, the steel plate is punched into a large outer diameter circle by the large outer diameter die 103 and the large outer diameter punch 85 in a state where the laminated plate receiver 105 and the alignment rod 108 are in contact with the back surface of the steel plate. The punched steel plates are stacked and crimped on the laminated plate receiver 105 with the alignment rod 108 inserted in the alignment holes. In this way, the necessary number of outer annular steel plates having a large outer diameter are punched and laminated together and caulked and fixed.

  The punch and die are changed according to the number of necessary steel plates. Specifically, similarly, the substrate 90 provided with the inner diameter punch 93 in the punch holder 82 is positioned. Next, after one step, the substrate 88 provided with the small outer diameter punch 87 in the punch holder 82 is positioned. At the same time, the small plate 104 is positioned on the die substrate 98 by sliding the sliding plate die 99.

  In this set state, an annular steel plate having a small outer diameter is continuously punched out. The inner annular steel plate is sequentially laminated on the outer large-diameter annular steel plate already laminated on the laminated plate receiver 105 with the alignment rod 108 in contact with the outer side, and is fixed by caulking. .

  Next, the substrate 89 provided with the inner diameter punch 91 and the alignment hole punch 92 is positioned in the punch holder 82 in order to process the outer large outer diameter annular steel plate again. Next, after one step, the substrate 86 provided with the large outer diameter punch 85 is positioned. At the same time, the large outer diameter die 103 is positioned by sliding the sliding plate die 99 on the die substrate 98.

  In this set state, the annular steel plate having a large outer diameter is continuously punched out. The outer large-diameter annular steel plate is sequentially laminated on the outer large outer-diameter annular steel plate already laminated on the laminated plate receiver 105 with the alignment rod 108 inserted in the alignment hole, and caulked. It is fixed.

  In this way, when the series of press work is completed, the control device moves the moving operation rod 106 of the laminated plate receiving mechanism 100 upward, and the laminated core fixed by caulking on the laminated plate receiver 105 is removed from the steel plate space 102. So that it can be removed.

The above-described embodiment is an example of an inner core having a round positioning hole, but an inner core production line having an arbitrary positioning hole is configured by changing to a punch and die for positioning holes of an arbitrary shape. can do.
(Other manufacturing methods, manufacturing equipment)
The configuration of the alignment hole of the laminated core can be any configuration as long as it can be aligned with each other when stacking punched plates having different outer diameter sizes as a function thereof, in addition to the configuration described above.

  The manufacturing method and the manufacturing apparatus of the laminated core may be a new method and apparatus by dividing the above-described method and apparatus for each step and appropriately combining them.

  According to the present invention, the plate having an arbitrary outer diameter is configured so as to be aligned by the alignment body, and the means for forming the laminate by performing alignment while punching the plate is an arbitrary target laminate. And available for its manufacture. In particular, the present invention can be applied to a structure in which a flat plate having a circular outer periphery and different outer diameters (peripheral diameters) is formed by punching and laminating from a plate-like body by a forward feeding process.

It is a block diagram of the inner core which provided the circular alignment hole suitable for manufacturing by the automatic progressive press work of this invention. It is a block diagram of the inner core which provided the U-shaped alignment hole suitable for manufacturing by automatic progressive press work of this invention. It is a specific structural diagram of an inner core having an outer annular steel plate provided with a U-shaped alignment hole of the present invention. It is a block diagram of the structure of the outer large annular steel plate which provided the U-shaped alignment hole of this invention, and the inner ring steel plate of a small outer diameter, and those caulking fixation means. It is a figure which shows the manufacturing process of the inner core provided with the U-shaped alignment hole of this invention as a punching process of a strip-shaped steel plate. It is a figure which shows the extraction die of the outer diameter extraction (pushback) process of this invention, and a dropping and caulking process. It is sectional drawing of the press work apparatus corresponding to the outer-diameter extraction (pushback) process and the drop-off / caulking process of this invention. It is explanatory drawing explaining the progressive feed press processing method performed automatically of this invention. 1 shows a conventional integrated magnetic core. It is a block diagram of the laminated core which consists of the conventional outer annular steel plate and inner annular steel plate. It is the block diagram and the principal part enlarged view of the conventional annular steel plate. It is explanatory drawing of the manufacturing method of the stator core by the conventional progressive press.

Explanation of symbols

10, 20 Laminated core 11 Circular alignment holes 12, 22 Center 13, 23 Outer periphery 14, 24 Inner periphery 15, 25 Positions 16, 17, 26, 27, 34 close to the center Large outer diameter annular steel plates 18, 28, 31 Small outer diameter annular steel plates 19 and 29 Inner side surfaces 21 and 47 U-shaped alignment holes 32 Protrusions 33 Recesses 35 Openings 40 Strip steel plates 41 Inner diameter holes 43 Slits 44 Dowel positioning holes 45 Dowel holes 46 Outer shape 48 Peripheral shape (small outer diameter)
49 Perimeter shape (large outer diameter)
51 Lower mold 52 Holder 53 Die 1
54 Push-up piston 55 Alignment protrusion 56 Spring 57 Upper mold 58, 75 Dowel positioning pin 59 Dowel receiving hole 60 Outer diameter punch 1
61 Ram 62, 74 Bolt 63 Alignment groove 64 Strip steel plate 65 Die 2
66 Side pressure cylinder 67 Lowering holding cylinder section 68 Dispensing section 69 Guide member 70 Outer diameter punch 71 Discharging controller 72 Laminated steel sheet detector 73 Discharging apparatus

Claims (11)

  In a laminated core in which a plurality of large-diameter annular steel plates and a plurality of small outer-diameter annular steel plates are combined and secured, an alignment hole for inserting an alignment body into each annular steel plate of the laminated core, The position of the point closest to the center of the annular steel plate in the alignment hole is greater than or equal to the radius from the center to the inner diameter and less than or equal to the radius from the center to the outer periphery and from the center to the inner diameter in the small outer diameter annular steel plate. A laminated core formed so as to be on the circumference of an arbitrary radius not including a radius.   The laminated core according to claim 1, wherein the arbitrary radius is a radius from the center to the outer periphery of the annular steel plate having the small outer diameter.   The laminated core according to claim 1, wherein the alignment hole has a shape in which the periphery of the alignment hole is closed.   The laminated core according to claim 1, wherein the alignment hole is a circular hole.   The laminated core according to claim 1 or 2, wherein the alignment hole is a U-shaped hole whose periphery is opened to the outer periphery.   The laminated core according to claim 1, wherein the alignment holes are annularly arranged at a predetermined interval.   The laminated core according to claim 6, wherein three alignment holes are provided. It is a manufacturing method for progressively pressing strip steel plates, the step of removing the inner diameter, the slit obtained by removing the outer peripheral shape of the small outer diameter annular steel plate from the outer peripheral shape of the large outer diameter annular steel plate including the alignment hole, in the stacking order. From the step of slitting using a movable punch according to the above, from the step of extracting the outer diameter with the outer peripheral shape of the annular steel plate having a large outer diameter, pushing back and fitting it back, and the step of caulking while removing the fitted punched steel plate In the manufacturing method, the laminated core manufacturing method, characterized in that the punched steel plate fitted back is pulled out by using a guide member that is inserted into the alignment hole. It is a manufacturing device that progressively presses strip-shaped steel sheets, and changes the outer peripheral shape of a small outer diameter annular steel plate from the outer peripheral shape of a large outer diameter annular steel plate including an inner diameter punch and an inner diameter die, and an alignment hole. For removing the slit, the slit punch and slit die for slitting using a movable punch according to the stacking order, the outer diameter of the outer peripheral shape of the annular steel plate having a large outer diameter, and push-back to fit back The outer diameter punch, the outer diameter die and the spring-biased push-up piston, and the outer diameter punch for caulking while pulling out the punched steel sheet fitted back using the guide member inserted into the alignment hole, A laminated core manufacturing apparatus comprising an outer diameter die and a side pressure cylinder. This is a manufacturing method for progressively pressing a strip steel plate, in which the inner diameter is removed at the same time as the inner diameter removal or the alignment hole removal, the outer diameter removal at the small outer diameter or the outer diameter removal at the large outer diameter is performed. A method for producing a laminated core, comprising: a step of sequentially laminating and caulking and fixing steel plates while aligning them. An inner diameter punch with an inner diameter punch and an alignment hole punch, which are connected in series for linear movement, an inner diameter die with an alignment hole, and a small outer diameter connected in series for linear movement A punch and a large outer diameter punch, a small outer diameter die and a large outer diameter die connected in series so as to be linearly movable, and a punched steel sheet provided below the strip-shaped steel plate below the small outer diameter die or the large outer diameter die. An apparatus for manufacturing a laminated core, comprising: a laminated steel sheet receiving mechanism that supports the steel sheets so that they can be sequentially laminated and caulked and fixed, and an alignment mechanism that aligns the punched steel sheets.

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