Laminated iron core manufacturing apparatus and back pressure jig

Abstract

To provide a manufacturing device of a laminated iron core and a back pressure jig which can apply back pressure to a laminated body of iron core pieces without using power.SOLUTION: A manufacturing device 10 includes: a die 32; and a punch 22 which is provided so as to be able to move up / down above the die and punches an iron core piece 91 from an electromagnetic steel plate 90 together with the die. The manufacturing device also includes a squeeze ring 33 which is arranged below the die and has an inner peripheral surface 33a that holds an outer peripheral surface 91a of the iron core piece. The manufacturing device includes a back pressure jig 40 which is attached to the inner peripheral surface of the squeeze ring, and supports a lower surface 91b of the iron core piece to apply back pressure being the upward pressure to the iron core piece when the punch pushes the iron core piece downward. The back pressure jig includes a holding part 50 which is held in a slidable manner with respect to the inner peripheral surface of the squeeze ring and a support part 60 which is connected to the holding part and supports the lower surface of the iron core piece.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to a manufacturing apparatus for a laminated core and a back pressure jig.

Background Art

[0002] Patent Document 1 describes a forward-feed die apparatus. The apparatus described in Patent Document 1 includes a punch and a die for punching a core thin plate from a strip-shaped thin steel plate that is intermittently transferred. Further, the apparatus includes a squeeze ring that is disposed below the die and holds the outer peripheral surface of the core thin plate, and a back pressure device that applies an upward pressure, that is, a back pressure, to the core thin plate held by the squeeze ring. The back pressure device is provided inside the squeeze ring so as to be movable up and down, and includes a receiving base on which the core thin plates are sequentially placed, a support unit that supports the receiving base, a lifting motor that performs the lifting operation of the receiving base via the support unit, and a control device that controls the rotational operation of the lifting motor. Through the control of the lifting motor by the control device, the receiving base is lowered to a position corresponding to the punching operation of the core thin plate. Thereby, a back pressure is applied to the core thin plate placed on the receiving base by the punch that has punched the core thin plate and the receiving base.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The apparatus described in Patent Document 1 requires a lifting motor and a control device, and has a complicated configuration. Therefore, a back pressure device with a simple configuration is desired.

Means for Solving the Problems

[0005] A laminated core manufacturing apparatus for solving the above problems comprises a die, a punch provided above the die so as to be vertically movable and punching out core pieces from an electromagnetic steel sheet together with the die, and a squeeze ring positioned below the die and having an inner surface for holding the outer surface of the core pieces, wherein the apparatus manufactures a laminated core by laminating the core pieces inside the squeeze ring, and further comprises a back pressure jig attached to the inner surface of the squeeze ring, which supports the lower surface of the core pieces and applies back pressure, which is an upward pressure, to the core pieces when the punch pushes the core pieces downward, the back pressure jig having a holding portion that is slidably held with respect to the inner surface of the squeeze ring, and a support portion connected to the holding portion and supporting the lower surface of the core pieces.

[0006] Furthermore, a back pressure jig for solving the above problems is applied to an apparatus for manufacturing laminated cores by stacking the core pieces inside the squeeze ring, the apparatus being attached to the inner surface of the squeeze ring and supporting the lower surface of the core pieces, thereby applying back pressure, which is an upward pressure, to the core pieces when the punch pushes the core pieces downward, the jig comprising: a holding part that is slidably held with respect to the inner surface of the squeeze ring; and a support part connected to the holding part and supporting the lower surface of the core pieces.

[0007] With these configurations, when core pieces are punched out from the electrical steel sheet, the core pieces are pushed downward by the punch. At this time, the support portion of the back pressure jig applies back pressure, which is upward pressure, to the laminated core, causing the overlapping core pieces to crimp together. Also, as the support portion is pushed downward via the core pieces, the holding portion slides downward along the inner surface of the squeeze ring. When the holding portion moves below the squeeze ring, the back pressure jig falls out of the squeeze ring due to its own weight. After the back pressure jig has fallen out, the laminate of core pieces held by the inner surface of the squeeze ring applies back pressure from below to the core pieces above the laminate, causing those core pieces to crimp. In this way, with the above configurations, back pressure can be applied to the laminate of core pieces without using power. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view showing a manufacturing apparatus for laminated iron cores equipped with a back pressure jig according to one embodiment. [Figure 2] Figure 2 is a bottom view of the back pressure jig shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view along line 3-3 in Figure 2. [Figure 4] Figure 4 is a cross-sectional view showing the back pressure jig from Figure 1 inserted inside the squeeze ring. [Figure 5] Figure 5 is a cross-sectional view showing the state immediately after the punch in Figure 1 has struck the iron core. [Figure 6] Figure 6 is a cross-sectional view showing the back pressure jig from Figure 1 having fallen out of the squeeze ring and been caught by the conveying device. [Modes for carrying out the invention]

[0009] An embodiment of a laminated core manufacturing apparatus and back pressure jig will be described below with reference to Figures 1 to 6. Note that, for the sake of clarity, some components in the drawings may be exaggerated or simplified, and therefore the dimensional ratios of each component may differ from those of the actual components.

[0010] First, let's describe the manufacturing apparatus for laminated iron cores (hereinafter referred to as manufacturing apparatus 10). As shown in Figure 1, the manufacturing apparatus 10 comprises a lower mold 30, an upper mold 20 provided above the lower mold 30 and movable up and down relative to the lower mold 30, a back pressure jig 40, and a conveying device 70.

[0011] <Upper mold 20> The upper die 20 has a substantially cylindrical punch 22 and a punch holder 21 that houses the punch 22. The punch 22 is mounted above the die 32, which will be described later, so as to be able to move up and down, and together with the die 32 punches out the core piece 91 from the electromagnetic steel sheet 90.

[0012] <Lower mold 30> The lower mold 30 includes a die holder 31, a die 32, and a squeeze ring 33. The die holder 31 has a through hole 31a that opens into the support surface 30a, which is the upper surface. The die 32 and the squeeze ring 33, both of which are substantially cylindrical, are arranged on the same axis within the through hole 31a.

[0013] The inner diameter of die 32 is slightly larger than the diameter of punch 22. The squeeze ring 33 is positioned below the die 32. The squeeze ring 33 has an inner surface 33a that presses against and holds the outer surface 91a of the iron core piece 91. The inner diameter of the squeeze ring 33 is slightly smaller than the inner diameter of the die 32.

[0014] <Back pressure jig 40> As shown in Figure 5, the back pressure jig 40 is attached to the inner circumferential surface 33a of the squeeze ring 33 and supports the lower surface 91b of the core piece 91, thereby applying back pressure, which is upward pressure, to the core piece 91 when the punch 22 pushes the core piece 91 downward.

[0015] In the following, the radial and circumferential directions of the squeeze ring 33 will be simply referred to as radial R and circumferential C, respectively. Furthermore, the inner and outer circumferential sides of radial R will be simply referred to as inner and outer circumferential sides, respectively.

[0016] As shown in FIG. 1, the back pressure jig 40 has a holding portion 50 that is slidably held against the inner peripheral surface 33a of the squeeze ring 33, and a support portion 60 that is connected to the holding portion 50 and supports the lower surface 91b of the core piece 91.

[0017] As shown in FIGS. 1 and 3, the support portion 60 has a base portion 61 and a contact portion 63 fixed to the upper surface of the base portion 61. The base portion 61 is columnar and made of metal. The contact portion 63 is a portion that contacts the lower surface 91b of the core piece 91. The contact portion 63 is disk-shaped and covers the entire upper surface of the base portion 61, and is made of resin. The contact portion 63 of the present embodiment is made of, for example, urethane resin. The diameter of the support portion 60 is smaller than the inner diameter of the squeeze ring 33.

[0018] As shown in FIGS. 1 to 3, the holding portion 50 has a fixing portion 56, a plurality of pressing portions 51, and a taper bolt 41. The fixing portion 56 is disk-shaped and is fixed to the lower surface of the support portion 60. Four bolt holes 56b are provided at equal intervals in the circumferential direction C in the fixing portion 56. By inserting a bolt 58 from below into the bolt hole 56b and screwing the bolt 58 into a female screw hole 61a that opens in the lower surface of the base portion 61 of the support portion 60, the fixing portion 56 is fixed to the base portion 61.

[0019] A circular hole 56a penetrating in the vertical direction Z is provided at the center of the fixing portion 56. The plurality of pressing portions 51 are arranged side by side in the circumferential direction C and have an outer peripheral surface 51a capable of pressing the inner peripheral surface 33a of the squeeze ring 33.

[0020] There are eight pressing portions 51 in the present embodiment. The outer peripheral surfaces 51a of the eight pressing portions 51 are located on a common circumference. The pressing portion 51 is located below the fixing portion 56 and is spaced apart from each other in the circumferential direction C. It has a substantially fan-shaped columnar pressing portion body 52 having the outer circumferential surface 51a, and a substantially fan-shaped columnar connecting portion 53 that connects the inner circumferential end of the pressing portion body 52 to the fixing portion 56. Therefore, a gap S is formed between the upper surface of the pressing portion body 52 and the lower surface of the fixing portion 56, allowing for displacement of the pressing portion body 52. ​​The outer circumferential surface 51a of the pressing portion body 52 is located on the outer circumferential side of the outer circumferential surface of the support portion 60.

[0021] Four of the eight pressing body 52 are provided with through holes 54 that penetrate in the vertical direction Z. The through holes 54 are used to pass the bolt 58 and the tool used to fasten the bolt 58 through the female screw hole 61a.

[0022] As shown in Figure 2, the inner circumferential surfaces 51b of the pressing body 52 and the connecting portion 53 are located on a common circumference. As shown in Figure 3, the inner circumferential surface 51b of the pressing part body 52 has a straight portion 51d that extends along the vertical direction Z, and an inclined portion 51c that is adjacent to the straight portion 51d below and is inclined so that the lower part is located closer to the outer circumference.

[0023] The straight section 51d is located on the circumference of a virtual circle C1 having a diameter equal to the inner diameter of the circular hole 56a (see Figure 2). Multiple pressing body 52s have internal threads (not shown) formed on their inner circumferential surfaces 51b.

[0024] A tapered bolt 41 is screwed into the space enclosed by the inner circumferential surfaces 51b of multiple pressing body 52 from below. The tapered bolt 41 has a male threaded portion 42 extending in the vertical direction Z and a head 43 connected to the base end of the male threaded portion 42. The head 43 is inclined so that it tapers towards the tip side of the tapered bolt 41, i.e., towards the top. By screwing the tapered bolt 41 into the inner circumferential surfaces 51b of the multiple pressing body 52, the more the head 43 enters the straight portion 51d, the more the pressing body 52 is pressed outward by the outer circumferential surface 43a of the head 43, causing the outer circumferential surface 51a of the pressing body 51 to be displaced outward.

[0025] Therefore, the inner circumferential surface 51b of the pressing part body 52 and the tapered bolt 41 are configured to change the position of the outer circumferential surfaces 51a of the multiple pressing parts 51 in the radial direction R. In this embodiment, the modification part is formed by the inner circumferential surface 51b of the pressing part body 52 and the tapered bolt 41.

[0026] <Conveying device 70> As shown in Figure 1, a conveying device 70 is positioned below the squeeze ring 33 to receive and transport the laminated iron core 92 that falls out of the squeeze ring 33. The conveying device 70 is a belt conveyor equipped with an endless belt 71.

[0027] Next, the operation of this embodiment will be described. As shown in Figure 4, first, with the support portion 60 facing upwards, the back pressure jig 40 is inserted into the squeeze ring 33 from below. As shown by the dashed line in Figure 4, with the back pressure jig 40 positioned at the initial position on the upper surface of the support portion 60 (described later), the tapered bolt 41 is screwed into the space surrounded by the inner circumferential surfaces 51b of the multiple pressing portion bodies 52. This displaces the outer circumferential surface 51a of the pressing portion body 52 outwards. This holds and attaches the retaining portion 50 to the inner circumferential surface 33a of the squeeze ring 33.

[0028] The initial position described above is either flush with the support surface 30a, or slightly below the support surface 30a by the thickness of several iron core pieces 91. As shown in Figure 5, when the core pieces 91 are punched out from the electromagnetic steel sheet 90, the core pieces 91 are pushed downward by the punch 22. At this time, the support portion 60 of the back pressure jig 40 applies back pressure, which is upward pressure, to the laminated core 92, causing the overlapping core pieces 91 to be crimped together by the fitting of recesses and protrusions (not shown). Also, as the support portion 60 is pushed downward via the core pieces 91, the holding portion 50 moves downward while sliding on the inner circumferential surface 33a of the squeeze ring 33.

[0029] Then, as shown in Figure 6, when the holding portion 50 moves below the squeeze ring 33, the back pressure jig 40 falls out of the squeeze ring 33 due to its own weight. After the back pressure jig 40 falls out, back pressure is applied from below to the iron core pieces 91 above the laminate 93, which is held by the inner circumferential surface 33a of the squeeze ring 33, causing the iron core pieces 91 to be crimped.

[0030] Next, the effects of this embodiment will be described. (1) The back pressure jig 40 has a holding portion 50 that is slidably held with respect to the inner circumferential surface 33a of the squeeze ring 33, and a support portion 60 that is connected to the holding portion 50 and supports the lower surface 91b of the iron core piece 91.

[0031] With this configuration, the above-mentioned effects are achieved, allowing back pressure to be applied to the laminated body 93 of the iron core pieces 91 without the use of power. (2) The manufacturing apparatus 10 is equipped with a conveying device 70 below the squeeze ring 33 to receive and convey the laminated iron core 92 that falls out of the squeeze ring 33.

[0032] With this configuration, the laminated iron core 92 that falls out of the squeeze ring 33 is caught and transported by the transport device 70. Therefore, the laminated iron core 92 can be easily removed from below the squeeze ring 33.

[0033] (3) The retaining portion 50 has a plurality of pressing portions 51 arranged in a line in the circumferential direction C of the squeeze ring 33, each having an outer peripheral surface 51a capable of pressing against the inner circumferential surface 33a of the squeeze ring 33. The retaining portion 50 also has a tapered bolt 41 configured to change the position of the outer peripheral surfaces 51a of the plurality of pressing portions 51 in the radial direction R of the squeeze ring 33.

[0034] With this configuration, the position of the outer circumferential surfaces 51a of the multiple pressing portions 51 in the radial direction R of the squeeze ring 33 can be changed by the tapered bolt 41. Therefore, the magnitude of the sliding resistance of the pressing portions 51 against the inner circumferential surface 33a of the squeeze ring 33, that is, the magnitude of the back pressure applied to the iron core piece 91, can be easily adjusted.

[0035] (4) The support portion 60 has a resin contact portion 63 that contacts the lower surface 91b of the iron core piece 91. This configuration makes it possible to prevent the iron core piece 91 from being damaged by contact with the support portion 60.

[0036] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0037] In this embodiment, the contact portion 63 was made of resin, but the entire support portion 60 may be made of resin. Alternatively, the entire support portion 60 may be made of metal. For example, multiple pressing body 52s may be constructed separately from the fixing part 56, and elongated holes that are long in the radial direction R may be formed in the pressing body 52s, so that the pressing body 52s are fixed to the fixing part 56 through the elongated holes. This makes it possible to change the connection position of each pressing body 52 with respect to the fixing part 56 in the radial direction R. Even in this case, the position of the outer circumferential surface 51a of the pressing part 51 can be changed. In this case, the connecting part 53 can be omitted.

[0038] In this embodiment, the back pressure jig 40 and the laminated iron core 92 are removed from below the squeeze ring 33 by the conveying device 70, but the back pressure jig 40 and the laminated iron core 92 may also be removed from below the squeeze ring 33 by, for example, an extrusion mechanism.

[0039] <Note> The above embodiment includes the configuration described in the following appendix. [Note 1] A device for manufacturing laminated cores, comprising: a die; a punch provided above the die so as to be vertically movable and punching out core pieces from an electromagnetic steel sheet together with the die; and a squeeze ring positioned below the die and having an inner surface for holding the outer surfaces of the core pieces, wherein the core pieces are stacked inside the squeeze ring, the device further comprising a back pressure jig attached to the inner surface of the squeeze ring and supporting the lower surface of the core pieces, thereby applying back pressure, which is an upward pressure, to the core pieces when the punch pushes the core pieces downward, the back pressure jig having a holding portion that is slidably held with respect to the inner surface of the squeeze ring, and a support portion connected to the holding portion and supporting the lower surface of the core pieces.

[0040] [Note 2] The laminated core manufacturing apparatus according to [Note 1], further comprising a conveying device below the squeeze ring for receiving and conveying the laminated core that falls out of the squeeze ring.

[0041] [Note 3] The manufacturing apparatus for laminated iron cores according to [Note 1] or [Note 2], wherein the holding portion comprises a plurality of pressing portions arranged in the circumferential direction of the squeeze ring and having outer peripheral surfaces capable of pressing the inner circumferential surface of the squeeze ring, and a changing portion configured to change the position of the outer peripheral surfaces of the plurality of pressing portions in the radial direction of the squeeze ring.

[0042] [Note 4] The support portion has a resin contact portion that contacts the lower surface of the iron core piece, the apparatus for manufacturing laminated iron cores according to any one of [Note 1] to [Note 3]. [Note 5] A back pressure jig for manufacturing a laminated core, comprising a die, a punch provided above the die so as to be vertically movable and punching out core pieces from an electromagnetic steel sheet together with the die, and a squeeze ring positioned below the die and having an inner surface for holding the outer surface of the core pieces, wherein the core pieces are stacked inside the squeeze ring, and the jig is attached to the inner surface of the squeeze ring and applies back pressure, which is an upward pressure, to the core pieces when the punch pushes the core pieces downward, by supporting the lower surface of the core pieces, the jig comprising a holding part that is slidably held with respect to the inner surface of the squeeze ring, and a support part connected to the holding part and supporting the lower surface of the core pieces.

[0043] [Note 6] The back pressure jig according to [Note 5], wherein the holding portion comprises a plurality of pressing portions arranged in the circumferential direction of the squeeze ring and having outer peripheral surfaces capable of pressing the inner circumferential surface of the squeeze ring, and a changing portion configured to change the position of the outer peripheral surfaces of the plurality of pressing portions in the radial direction of the squeeze ring.

[0044] [Note 7] The back pressure jig according to [Note 5] or [Note 6], wherein the support portion has a resin contact portion that contacts the lower surface of the iron core piece. [Explanation of Symbols]

[0045] 10…Laminated iron core manufacturing equipment (manufacturing equipment) 20…Upper mold 21... Punch holder 22... Punch 30…Lower mold 30a…support surface 31... Die holder 31a...Through hole 32... Die 33... Squeeze ring 33a…Inner peripheral surface 40... Back pressure jig 41... Tapered bolt (modified part) 42...Male threaded section 43...Head 43a...Outer surface 50...Holding part 51...Pressing part 51a...Outer surface 51b…Inner peripheral surface 51c…Slope part 51d...Straight section 52... Pressing part body 53...Connection part 54…Through hole 56…Fixed part 56a...Circular hole 56b... Bolt hole 58... Bolts 60...Support part 61...Base 61a... Female threaded hole 63...Contact part 70…Conveyor equipment 71... Endless belt 90...Electromagnetic steel plate 91… Iron core piece 91a...Outer surface 91b…Bottom surface 92...Laminated iron core 93...Laminate

Claims

1. Dai and, A punch is provided above the die so as to be able to move up and down, and together with the die, punches out a core piece from the electromagnetic steel sheet, The system includes a squeeze ring positioned below the die and having an inner surface that holds the outer surface of the iron core piece, An apparatus for manufacturing a laminated iron core by stacking the iron core pieces inside the squeeze ring, The squeeze ring is fitted with a back pressure jig that supports the lower surface of the core piece, thereby applying back pressure, which is an upward pressure, to the core piece when the punch pushes the core piece downward. The aforementioned back pressure jig is A retaining portion that is slidably held with respect to the inner circumferential surface of the squeeze ring, It has a support portion connected to the holding portion and supporting the lower surface of the iron core piece, Manufacturing equipment for laminated iron cores.

2. Below the squeeze ring, a conveying device is provided to receive and transport the laminated iron core that falls out of the squeeze ring. The apparatus for manufacturing laminated iron cores according to claim 1.

3. The aforementioned retaining part is A plurality of pressing portions are arranged in a line in the circumferential direction of the squeeze ring and have an outer surface capable of pressing the inner surface of the squeeze ring, The squeeze ring has a modification section configured to change the position of the outer circumferential surface of the plurality of pressing portions in the radial direction, The apparatus for manufacturing laminated iron cores according to claim 1.

4. The support portion has a resin contact portion that contacts the lower surface of the iron core piece. A manufacturing apparatus for laminated iron cores according to any one of claims 1 to 3.

5. The apparatus for manufacturing laminated cores comprises a die, a punch mounted above the die so as to be vertically movable and punching out core pieces from an electromagnetic steel sheet together with the die, and a squeeze ring positioned below the die and having an inner surface for holding the outer surface of the core pieces, wherein the core pieces are stacked inside the squeeze ring, and the back pressure jig is attached to the inner surface of the squeeze ring and supports the lower surface of the core pieces, thereby applying an upward back pressure to the core pieces when the punch pushes the core pieces downward, A retaining portion that is slidably held with respect to the inner circumferential surface of the squeeze ring, It has a support portion connected to the holding portion and supporting the lower surface of the iron core piece, Back pressure jig.

6. The aforementioned retaining part is A plurality of pressing portions are arranged in a line in the circumferential direction of the squeeze ring and have an outer surface capable of pressing the inner surface of the squeeze ring, The squeeze ring has a modification section configured to change the position of the outer circumferential surface of the plurality of pressing portions in the radial direction, The back pressure jig according to claim 5.

7. The support portion has a resin contact portion that contacts the lower surface of the iron core piece. The back pressure jig according to claim 5 or claim 6.

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