JP2020110817A - Metal mold device - Google Patents

Abstract

To provide a metal mold device which can improve shape accuracy of a punched metal product.SOLUTION: A metal mold device comprises: first and second die plates which are so held by a die holder as to be arranged in one row with respect to a longer direction of a belt-like metal plate; a fist die which is held on the first die plate, and is provided with a first die hole penetrating itself; a second die which is held on the second die plate, and is provided with a second die hole penetrating itself; a first punch which is so located as to face the first die, and is so configured as to be capable of being inserted in and withdrawn from the first die hole; and a second punch which is so located as to face the second die, and is so configured as to be capable of being inserted in and withdrawn from the second die hole. The first die plate and the second die plate are separated from each other in the longer direction.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a mold device.

Patent Document 1 discloses a progressive die. The progressive die is, for example, configured such that a strip-shaped metal plate (coil material) wound in a coil shape is intermittently fed from an uncoiler, and the metal plate is sequentially punched by a punch to manufacture a metal product. ing. Therefore, the progressive die includes a lower die provided with a plurality of die holes arranged in the longitudinal direction of the metal plate (transport direction of the metal plate), and a plurality of punches respectively corresponding to the plurality of die holes.

Japanese Patent No. 5719979

By the way, when a metal product is punched by a punch, a lateral load of about 15% of the punching load may act on the periphery of a die hole corresponding to the punch. When the die hole spreads due to this lateral load, the positions of other die holes adjacent to the die hole in the longitudinal direction are displaced, which may affect the accuracy of the shape of the punched metal product.

Therefore, the present disclosure describes a mold device capable of improving the accuracy of the shape of a punched metal product.

A mold apparatus according to one aspect of the present disclosure is provided with first and second die plates held by a die holder so as to be aligned in a row with respect to a longitudinal direction of a strip-shaped metal plate, and held by the first die plate. A first die having a first die hole passing therethrough, a second die held by a second die plate and having a second die hole passing therethrough; A first punch, which is arranged so as to face the first die and is configured so that it can be inserted into and removed from the first die hole, and a second punch which is arranged so as to face the second die, And a second punch configured to be insertable and removable. The first die plate and the second die plate are separated from each other in the longitudinal direction.

According to the mold device according to the present disclosure, it is possible to improve the accuracy of the shape of the punched metal product.

FIG. 1 is a perspective view showing an example of a stator laminated core. FIG. 2 is a schematic diagram showing an example of a laminated core manufacturing apparatus. FIG. 3 is a schematic cross-sectional view showing an example of the mold device. FIG. 4 is a cross-sectional view illustrating the vicinity of the die plate for removing the outer shape. FIG. 5 is a perspective view illustrating the vicinity of the die plate for removing the outer shape. FIG. 6 is a top view showing an example of the punching member. FIG. 7 is a perspective view showing another example near the die plate for removing the outer shape.

Hereinafter, an example of an embodiment according to the present disclosure will be described in more detail with reference to the drawings. In the following description, the same elements or elements having the same function will be denoted by the same reference symbols, without redundant description.

[Stator laminated core]
First, the structure of the stator laminated core 1 will be described with reference to FIG. The stator laminated core 1 (stator) has a cylindrical shape. A through hole 1a extending along the central axis Ax is provided in the central portion of the stator laminated core 1. A rotor core (not shown) can be arranged in the through hole 1a. The stator laminated core 1 constitutes an electric motor together with the rotor core.

The stator laminated core 1 is obtained by processing a laminated body St (see FIG. 2) in which a plurality of punching members W are laminated. The stator laminated core 1 has one yoke portion 2 and a plurality of teeth portions 3.

The yoke portion 2 has an annular shape and extends so as to surround the central axis Ax. The inner diameter, the outer diameter, the width, etc. of the yoke portion 2 can be set to various sizes according to the application and performance of the motor. The yoke portion 2 includes a plurality of yokes 2a and a plurality of connecting portions 2b.

The connecting portion 2b is located between the yokes 2a that are adjacent to each other in the circumferential direction of the stator laminated core 1 and is located on the outer edge side of the yoke 2a. The connecting portion 2b integrally connects the yokes 2a that are adjacent to each other in the circumferential direction of the stator laminated core 1. A notch 4 is formed on the inner edge side of the yoke 2a connected by the connecting portion 2b. In the example shown in FIG. 1, a gap exists in the cutout portion 4, but the side surfaces of the cutout portion 4 may be in contact with each other.

Each of the teeth portions 3 extends in the radial direction of the stator laminated core 1 from the inner edge of the corresponding yoke 2a toward the central axis Ax side. In the example shown in FIG. 1, one tooth portion 3 is integrally formed with one yoke 2a, and constitutes one iron core piece.

The teeth portions 3 are arranged at substantially equal intervals in the circumferential direction of the stator laminated core 1. When the stator laminated core 1 is configured as a motor, a winding (not shown) is wound around each tooth portion 3 a predetermined number of times. A slot 5, which is a space for disposing the winding wire, is defined between the adjacent tooth portions 3.

The yoke portion 2 and the teeth portion 3 are each provided with a crimp portion 6. The crimping portion 6 is configured to fasten two adjacent punching members W among the punching members W to each other. The crimp portion 6 may be provided on at least one of the yoke portion 2 and the tooth portion 3.

[Manufacturing device for laminated stator core]
Then, with reference to FIG. 2, the manufacturing apparatus 10 of the stator laminated core 1 is demonstrated. The manufacturing apparatus 10 is an apparatus for manufacturing a laminated iron core from a strip-shaped electromagnetic steel plate ES (metal plate). The manufacturing apparatus 10 includes an uncoiler 20, a delivery device 30, a mold device 100, and a controller Ctr (control unit).

The uncoiler 20 rotatably holds the coil material 21 in a state in which the coil material 21 which is a strip-shaped electromagnetic steel plate ES wound in a coil shape is mounted. The delivery device 30 has a pair of rollers 31 and 32 that sandwich the electromagnetic steel plate ES from above and below. The pair of rollers 31 and 32 rotate and stop based on an instruction signal from the controller Ctr, and intermittently sequentially feed the electromagnetic steel plate ES toward the die device 100.

The controller Ctr, for example, generates an instruction signal for operating each of the delivery device 30 and the mold device 100 based on a program recorded in a recording medium (not shown) or an operation input from an operator, It is configured to send to these.

[Details of mold equipment]
Subsequently, details of the mold apparatus 100 will be described with reference to FIGS. 3 to 5. The die device 100 is configured to sequentially punch the electromagnetic steel plates ES that are intermittently fed by the feeding device 30 to form the punching member W. The mold device 100 is configured to sequentially stack the punching members W obtained by the punching process and superimpose them on each other to manufacture the stacked body St.

The mold device 100 includes a lower mold 200, an upper mold 300, and a pressing machine 400. The lower die 200 includes a base 210, a die holder 220, a plurality of die members D1 to D4, and a plurality of guide posts 230. The base 210 is fixed on the floor surface, for example, and functions as a base of the entire mold apparatus 100.

The die holder 220 is supported on the base 210. The die holder 220 has a plurality of discharge holes C1 to C4 and a plurality of recesses E1 to E4. The die holder 220 may be made of, for example, a steel material (raw material) that has not been subjected to heat treatment such as quenching.

As illustrated in FIG. 3, the plurality of discharge holes C1 to C4 may extend inside the die holder 220 in the up-down direction (see arrow Z in FIGS. 3 to 5). The material punched from the electromagnetic steel plate ES (for example, punching member W, waste material, etc.) is discharged to the plurality of discharge holes C1 to C4.

The plurality of recesses E1 to E4 are connected to the upper ends of the discharge holes C1 to C4 so as to correspond to the discharge holes C1 to C4, respectively, and are opened toward the upper surface of the die holder 220. The plurality of recesses E1 to E4 are arranged in a line in the transport direction of the electromagnetic steel plate ES by the delivery device 30 (see arrow X in FIGS. 3 to 5). The transport direction is also the longitudinal direction of the electromagnetic steel plate ES. As illustrated in FIG. 3, any of the plurality of recesses E1 to E4 may be separated from another recess that is adjacent in the longitudinal direction. The depth of the recess E4 may be set deeper than the other recesses E1 to E3, as illustrated in FIG.

The plurality of die members D1 to D4 are attached to the upper portion of the die holder 220. The die member D1 includes a back plate D11, a die plate D12, and a die D13. The back plate D11 is housed in the recess E1. As illustrated in FIG. 3, the upper surface of the back plate D11 may be substantially flush with the upper surface of the die holder 220 when the back plate D11 is housed in the recess E1. The back plate D11 is configured to hold the die plate D12 and the die D13. The back plate D11 may be made of, for example, a steel material that has been subjected to heat treatment such as quenching. A through hole that penetrates in the up-down direction is formed in the central portion of the back plate D11. The through hole communicates with the discharge hole C1.

The die plate D12 is placed on the back plate D11, and is held by the die holder 220 via the back plate D11. That is, the upper surface of the die plate D12 may be located above the upper surface of the die holder 220. A through hole is formed in the center of the die plate D12 so as to penetrate therethrough in the vertical direction. The die plate D12 is configured to hold the die D13 in the through hole. The die plate D12 may be made of, for example, a steel material that has been subjected to heat treatment such as quenching.

The die D13 is housed in the through hole of the die plate D12 and placed on the back plate D11. A die hole penetrating in the vertical direction is formed in the center of the die D13. The die hole communicates with the through hole of the back plate D11. The outer shape of the die D13 may be smaller than the outer shape of the back plate D11 when viewed from above. A corresponding punch P1 (described later) is inserted into and removed from the inside of the die hole of the die D13, so that the electromagnetic steel plate ES is punched out in a shape along the contour of the die hole. The die D13 may be made of, for example, a cemented carbide containing tungsten carbide.

The die member D2 includes a back plate D21, a die plate D22, and a die D23. The back plate D21, the die plate D22, and the die D23 are configured similarly to the back plate D11, the die plate D12, and the die D13, respectively. However, the rear plate D21 is different from the rear plate D11 in that the rear plate D21 is housed in the recess E2 and the through hole of the rear plate D21 communicates with the discharge hole C2. Therefore, the die plate D22 placed on the back plate D21 is separated from the die plate D12 adjacent in the transport direction. Further, the corresponding punch P2 (described later) is inserted into and removed from the die hole of the die D23, whereby the electromagnetic steel plate ES is punched out in a shape along the contour of the die hole, which is different from the die D13. doing.

The die member D3 includes a back plate D31, a die plate D32 (second die plate), and a die D33 (second die). The back plate D31, the die plate D32, and the die D33 are configured similarly to the back plate D11, the die plate D12, and the die D13, respectively. However, the rear plate D31 differs from the rear plate D11 in that the rear plate D31 is housed in the recess E3, and the through hole of the rear plate D31 communicates with the discharge hole C3. Therefore, the die plate D32 placed on the back plate D31 is separated from the die plate D22 adjacent in the transport direction. Further, by inserting/extracting a corresponding punch P3 (described later) into/from the die hole (second die hole) of the die D33, the electromagnetic steel plate ES is punched out in a shape along the contour of the die hole. It is different from the die D13 in the point.

As shown in FIGS. 3 to 5, the die member D4 includes a back plate D41, a die plate D42 (first die plate), a die D43 (first die), a squeeze ring D44, and a metal liner. D45 and. The back plate D41 is housed in the recess E4. As illustrated in FIGS. 3 and 4, in the state where the back plate D41 is housed in the recess E4, the back plate D41 is located at the bottom of the recess E4 so that the entire back plate D41 is housed in the recess E4. May be.

The back plate D41 is configured to hold the die plate D42, the die D43, and the squeeze ring D44. The back plate D41 may be made of, for example, a steel material that has been subjected to heat treatment such as quenching. A through hole D41a (see FIG. 4) penetrating in the vertical direction is formed in the center of the back plate D41. The through hole D41a communicates with the discharge hole C4.

The die plate D42 is placed on the back plate D41, and is held by the die holder 220 via the back plate D41. Therefore, the die plate D42 is separated from the adjacent die plate D32 in the transport direction. As shown in FIGS. 4 and 5, the lower portion of the die plate D42 may be housed in the recess E4, and the upper portion of the die plate D42 may project to the outside of the recess E4. That is, the upper surface of the die plate D42 may be located above the upper surface of the die holder 220.

A through hole D42a penetrating in the vertical direction is formed in the center of the die plate D42. The die plate D42 is configured to hold the die D43 in the through hole D42a. The die plate D42 may be made of, for example, a steel material that has been subjected to heat treatment such as quenching.

The die D43 is housed in the through hole D42a of the die plate D42 and placed on the squeeze ring D44. The upper surface of the die D43 may be substantially flush with the upper surface of the die plate D42. The upper surfaces of the die plates D42 and D43 may be substantially flush with the upper surfaces of the other die plates D12, D22, D32 and the dies D13, D23, D33. A die hole D43a (first die hole) (see FIGS. 3 and 4) penetrating in the vertical direction is formed in the center of the die D43. By inserting/extracting a corresponding punch P4 (first punch) (described later) into/from the die hole D43a of the die D43, the electromagnetic steel plate ES is punched in a shape along the contour of the die hole D43a. The die D43 may be made of, for example, a cemented carbide containing tungsten carbide. As illustrated in FIG. 5, the die D43 may be configured by combining a plurality of divided pieces.

The die member D4 may be used for outline cutting. In this case, the shape of the die hole D43a is substantially the same as the outer shape of the punching member W. The punching member W punched through the die hole D43a is supported by a cylinder D46 configured to be vertically movable, as shown in FIG. The cylinder D46 is configured to intermittently move downward each time the punching members W are stacked. When the number of punching members W stacked on the cylinder D46 reaches a predetermined number and the stacked body St is formed, the cylinder D46 descends and the stacked body St on the cylinder D46 is discharged from the mold apparatus 100 through the discharge hole C4. Is discharged to. The die member D4 does not have to include the cylinder D46.

As shown in FIG. 5, the die hole D43a includes one yoke corresponding region D43b and a plurality of teeth corresponding regions D43c. One yoke corresponding region D43b extends linearly in the width direction of the electromagnetic steel plate ES (see arrow Y in FIGS. 3 to 5). The plurality of teeth corresponding regions D43c protrude from the yoke corresponding region D43b in the longitudinal direction of the electromagnetic steel plate ES. The plurality of teeth-corresponding regions D43c are arranged in a row at predetermined intervals in the width direction of the electromagnetic steel plate ES. Therefore, the die hole D43a may have a long hole shape extending in the width direction of the electromagnetic steel plate ES as a whole, or may have a comb tooth shape as a whole.

As shown in FIGS. 3 and 4, the squeeze ring D44 is housed in the through hole D42a of the die plate D42 and is arranged between the back plate D41 and the die D43. As shown in FIG. 4, a through hole D44a penetrating in the vertical direction is formed in the central portion of the squeeze ring D44. The through hole D44a communicates with the through hole D41a of the back plate D41 and the die hole D43a of the die D43, respectively.

The diameter of the through hole D44a is set smaller than the diameter of the die hole D43a. For example, the diameter of the through hole D44a may be set smaller than the diameter of the die hole D43a by about 2 μm to 10 μm. Therefore, when the punching member W punched in the die hole D43a passes through the die D43 and reaches the squeeze ring D44, a lateral pressure from the outer peripheral side of the punching member W toward the inside acts on the punching member W. Therefore, since the punching member W is held by the squeeze ring D44 and is less likely to drop downward, the fastening with the succeeding punching member W via the caulking portion 6 can be performed more reliably.

The outer shapes of the die D43 and the squeeze ring D44 may be smaller than the outer shape of the back plate D41 when viewed from above. The squeeze ring D44 may be made of, for example, a cemented carbide containing tungsten carbide.

The metal liner D45 is interposed between the die plate D42 and the die holder 220 so as to surround the die plate D42. As illustrated in FIG. 5, a plurality of metal liners D45 may be interposed between the die plate D42 and the die holder 220. The metal liner D45 is used to adjust the position of the die plate D42 with respect to the die holder 220. Therefore, the size of the metal liner D45 may be appropriately selected within a range in which the purpose of position adjustment can be achieved.

From the viewpoint of mounting the die plate D42 and the metal liner D45, the metal liner D45 may have a tapered shape in which the thickness on the upper end side is thinner than that on the lower end side. Alternatively, the outer shape of the lower portion of the die plate D42 may be set smaller than the outer shape of the upper portion of the die plate D42.

As shown in FIG. 3, the plurality of guide posts 230 linearly extend upward from the die holder 220. The plurality of guide posts 230 are configured to guide the upper die 300 in the vertical direction together with the guide bushes 311 (described later). The plurality of guide posts 230 may be attached to the upper mold 300 so as to extend downward from the upper mold 300.

The upper die 300 includes a punch holder 310, a stripper 320, and a plurality of punches P1 to P4. The punch holder 310 is arranged above the die holder 220 so as to face the die holder 220. The punch holder 310 is configured to hold the plurality of punches P1 to P4 on the lower surface side thereof.

The punch holder 310 is provided with a plurality of guide bushes 311. The plurality of guide bushes 311 are located so as to correspond to the plurality of guide posts 230, respectively. The guide bush 311 has a cylindrical shape, and the guide post 230 can be inserted into the internal space of the guide bush 311.

The punch holder 310 is provided with a plurality of through holes 312. A step-like step is formed on the inner peripheral surface of the through hole 312. Therefore, the diameter of the upper portion of the through hole 312 is set smaller than the diameter of the lower portion of the through hole 312.

The stripper 320 is configured to remove, from the punches P1 to P4, the electromagnetic steel sheet ES that has hit the punches P1 to P4 when punching the electromagnetic steel sheet ES with the punches P1 to P4. The stripper 320 is arranged between the die members D1 to D4 and the punch holder 310.

The stripper 320 is connected to the punch holder 310 via a connecting member 321. The connecting member 321 includes an elongated main body and a head provided on the upper end of the main body. The main body is inserted in the lower part of the through hole 312 and can move up and down in the through hole 312. The lower end of the main body is fixed to the stripper 320. A biasing member 322 such as a compression coil spring is attached around the main body.

The head portion is arranged above the through hole 312. The outer shape of the head is set to be larger than the outer shape of the main body when viewed from above. Therefore, the head can move up and down in the upper part of the through hole 312, but the step of the through hole 312 functions as a stopper and cannot move to the lower part of the through hole 312. Therefore, the stripper 320 is suspended and held by the punch holder 310 so as to be vertically movable relative to the punch holder 310.

Through holes are provided in the stripper 320 at positions corresponding to the punches P1 to P4, respectively. Each through hole extends vertically. When viewed from above, each through hole communicates with the corresponding die hole of the die D13, D23, D33, D43. The lower parts of the punches P1 to P4 are inserted into the respective through holes. The lower parts of the punches P1 to P4 are slidable in the respective through holes.

The press machine 400 is located above the upper mold 300. The piston of the press machine 400 is connected to the punch holder 310 and operates based on an instruction signal from the controller Ctr. When the press machine 400 operates, the piston expands and contracts, and the upper die 300 moves up and down as a whole.

[Method for manufacturing stator laminated core]
Then, the manufacturing method of stator lamination iron core 1 is explained. When the electromagnetic steel plate ES is intermittently sent to the die device 100 by the sending device 30 and the non-processed portion of the electromagnetic steel plate ES reaches the die member D1, the press machine 400 operates to move the upper mold 300 to the lower mold 200. Push it downwards. Even after the stripper 320 reaches the electromagnetic steel plate ES and the electromagnetic steel plate ES is sandwiched between the stripper 320 and the die member D1, the pressing machine 400 pushes the upper die 300 downward. At this time, the stripper 320 does not move, but the punch holder 310 and the punches P1 to P4 continue to descend. Therefore, the tip portions of the punches P1 to P4 respectively move downward in the through holes of the stripper 320 and further reach the die holes of the dies D13, D23, D33, D43. In this process, the punch P1 punches the electromagnetic steel plate ES along the die hole of the die D13. The punched waste material is discharged from the discharge hole C1. After that, the press machine 400 operates to raise the upper mold 300.

Next, when the electromagnetic steel plate ES is intermittently sent out by the sending device 30 and the non-processed parts of the electromagnetic steel plate ES reach the die members D2, D3, D4 in sequence, the press machine 400 moves the upper die 300 up and down in the same manner as described above. Then, the electromagnetic steel plate ES is punched or machined by the punches P2, P3 and P4. In the die member D4, the electromagnetic steel plate ES processed by the punches P1 to P3 is punched into a shape along the die hole D43a of the die D43 to form the punching member W.

Here, the punching member W includes one yoke portion W1 and a plurality of tooth portions W2, as shown in FIG. The shape of the yoke portion W1 corresponds to the shape of the yoke corresponding region D43b. Therefore, the yoke portion W1 extends linearly in the predetermined direction.

The yoke portion W1 includes a plurality of yokes W1a and a plurality of connecting portions W1b. Each of the plurality of yokes W1a is arranged in a line in the longitudinal direction so as to extend in the longitudinal direction of the yoke portion W1. The connecting portion W1b is located between the adjacent yokes W1a and is also located on the outer edge side of the yoke W1a (the side opposite to the tooth portion W2). The connecting portion W1b integrally connects the adjacent yokes W1a. A notch W3 is formed on the inner edge side of the yoke 32a connected by the connecting portion W1b.

The shapes of the plurality of tooth portions W2 respectively correspond to the shapes of the plurality of tooth corresponding regions D43c. Therefore, each of the plurality of tooth portions W2 projects from the yoke portion W1 in a direction intersecting the longitudinal direction of the yoke portion W1. A crimp portion W4 is formed on each of the yoke portion W1 and the teeth portion W2.

The punching member W having such a configuration is laminated in the die D43 and the squeeze ring D44 while being fastened to the already punched punching member W via the caulking portion 6. When a predetermined number of punching members W are stacked on the cylinder D46 to form the stacked body St, the stacked body St is delivered to the outside of the mold device 100 and conveyed to a processing machine (not shown). The processing machine performs a process of bending the stacked body St at each notch W3 so that the yoke W1 has an annular shape, and a process of welding and joining both ends of the yoke W1. In this way, the stator laminated core 1 is manufactured. Therefore, the yoke portion W1, the tooth portion W2, the notch portion W3 and the crimp portion W4 of the punching member W correspond to the yoke portion 2, the tooth portion 3, the notch portion 4 and the crimp portion 6 of the stator laminated core 1, respectively.

[Action]
According to the above example, all of the plurality of die plates D12, D22, D32, D42 are separated from the other die plates adjacent in the longitudinal direction. In this case, even if any of the plurality of dies D13, D23, D33, D43 is deformed so as to expand in the longitudinal direction of the electromagnetic steel plate ES due to the lateral load generated at the time of punching the electromagnetic steel plate ES, another die plate adjacent thereto Is hardly affected by the deformation. Therefore, the die holes are less likely to be displaced in any of the die plates D12 to E42. Therefore, the accuracy of the shape of the punched punching member W can be improved.

According to the above example, the die D43 is used as a die for contour cutting. In this case, the die hole D43a generally has a larger opening area than the other die holes. Therefore, the die plate D42, which holds the die D43 for punching the outer shape, tends to be deformed by the lateral load during the punching process. However, since the die plates D32 and D42 adjacent to each other in the longitudinal direction are separated from each other, even if the die plate D42 is deformed, the die plate D32 is hardly affected by the deformation. Therefore, the precision of the shape of the punched punching member W can be further improved.

According to the above example, the die plate D42 is arranged in the recess E4 provided in the die holder 220. In this case, since the die holder 220 exists around the die plate D42, even if the die plate D42 is deformed, the deformation is restrained by the die holder 220. Therefore, the positional deviation of the die hole is less likely to occur, and the precision of the shape of the punched punching member W can be further improved.

According to the above example, the metal liner D45 is arranged between the die plate D42 and the recess E4. In this case, the mounting position of the die plate D42 with respect to the die holder 220 can be finely adjusted by the metal liner D45. Further, since the metal liner 45 is interposed between the die holder 220 and the die plate D42, they do not come into direct contact with each other, so that both can be protected together.

According to the above example, the die hole D43a has a long hole shape extending in the width direction of the electromagnetic steel sheet ES as a whole. In this case, the die plate D42 is more easily deformed in the longitudinal direction due to the lateral load during the punching process, but since the die plates D32 and D42 adjacent to each other in the longitudinal direction are separated from each other, the die plate adjacent to the die plate D42 is separated. D32 is hardly affected by the deformation. Therefore, the precision of the shape of the punched punching member W can be further improved.

According to the above example, the die hole D43a includes one yoke corresponding region D43b extending linearly in the width direction of the electromagnetic steel plate ES. In this case, since the die hole D43a has a particularly elongated shape, the die plate D42 is more easily deformed in the longitudinal direction due to the lateral load during the punching process. However, since the die plates D32 and D42 adjacent to each other in the longitudinal direction are separated from each other, the die plate D32 adjacent to the die plate D42 is hardly affected by the deformation. Therefore, the precision of the shape of the punched punching member W can be further improved.

According to the above example, the upper surfaces of the die plates D12, D22, D32, D42 are located above the upper surface of the die holder 220. In this case, when the surfaces of the die plates D12, D22, D32, and D42 are ground for maintenance of the mold apparatus 100, contact of the grinding wheel with the die holder 220 is prevented. Therefore, it is possible to suppress the wear of the die holder 220. Further, when the die holder 220 is made of a raw material, the grinding wheel does not come into contact with the die holder 220, so that clogging of the grinding wheel can be suppressed.

[Modification]
Although the embodiments according to the present disclosure have been described above in detail, various modifications may be added to the above embodiments without departing from the scope of the claims and the gist thereof.

(1) In the above example, a plurality of yokes 2a (iron core pieces) are connected in series by the connecting portion 2b, and the connecting portion 2b is bent to form a fold type stator laminated iron core 1 that is annular. The mold device 100 has been described. However, a split type stator laminated core formed by combining a plurality of iron core pieces may be manufactured by the mold device 100, or a non-divided stator laminated core may be manufactured by the mold device 100. .. Alternatively, the rotor laminated core may be manufactured by the mold device 100. The mold apparatus 100 may be a progressive mold configured to manufacture various other metal products (for example, a lead frame).

The core piece that constitutes the split type stator laminated core may be composed of one yoke 2a and one or a plurality of teeth portions 3 that are integrally provided on the yoke 2a. FIG. 7 shows an example of an outer shape drawing die D43 for forming an iron core piece in which a plurality of teeth portions 3 are integrally provided on one yoke 2a. In the example of FIG. 7, the yoke corresponding region D43b has a circular arc shape, and the die hole D43a has a long hole shape extending in the width direction of the electromagnetic steel plate ES as a whole. Therefore, the die plate D42 is more likely to be deformed in the longitudinal direction by the lateral load during the punching process. However, since the die plates D32 and D42 adjacent to each other in the longitudinal direction are separated from each other, the die plate D32 adjacent to the die plate D42 is hardly affected by the deformation in the example of FIG.

(2) For example, one die may be provided with a die hole that is not used for outline cutting, and the die may be held by one die plate. Also in this case, since the outer shape punching die plate, which is easily deformed by the lateral load during the punching process, is separated from the non-outer contour punching die plate, the accuracy of the shape of the punched punching member W is improved. It becomes possible.

(3) The yoke corresponding region D43b may extend substantially parallel to the width direction of the electromagnetic steel plate ES (see FIG. 5), or may extend linearly with a predetermined inclination with respect to the width direction of the electromagnetic steel plate ES. Good. That is, the yoke corresponding region D43b may extend along the width direction of the electromagnetic steel plate ES.

(4) The mold device 100 may not include the metal liner D45.

(5) The upper surfaces of the die plates D12, D22, D32, and D42 may be substantially flush with the upper surface of the die holder 220, or may be located below the upper surface of the die holder 220.

(6) In the above example, one die D13, D23, D33, D43 is arranged on each die plate D12, D22, D32, D42, but a plurality of dies are arranged on one die plate. It may have been done.

[Example]
Example 1. A mold device (100) according to an example of the present disclosure includes first and second die plates held by a die holder (220) so as to be aligned in a row with respect to a longitudinal direction of a strip-shaped metal plate (ES). (D42, D32), a first die (D43) held by the first die plate (D42) and provided with a first die hole (D43a) penetrating itself, and a second die plate (D43). A second die (D33) held by D32) and provided with a second die hole penetrating itself, and a first die hole (D43a) arranged so as to face the first die (D43). ) And a second punch (P4) that is configured to be insertable and removable with respect to the second die (D33) and is configured to be insertable and removable with respect to the second die hole. Punch (P3). The first die plate (D43) and the second die plate (D33) are separated from each other in the longitudinal direction. In this case, for example, even if a lateral load acts on the first die by punching the metal plate through the first die and the first die plate is deformed so as to expand in the longitudinal direction, the second die plate Is hardly affected by the deformation. Similarly, even if a lateral load acts on the second die by punching the metal plate through the second die and the second die plate is deformed so as to expand in the longitudinal direction, the first die plate is Almost unaffected by deformation. Therefore, in these two die plates, it is difficult for the die holes to be displaced. Therefore, the precision of the shape of the punched metal product can be improved.

Example 2. In the device (100) of Example 1, the first die (D43) may be a die for contour cutting. When the first die plate is used for outline cutting, the opening area of the first die hole is generally larger than that of the other die holes. Therefore, the first die plate that holds the first die for punching the outer shape tends to be deformed by the lateral load during the punching process. However, according to Example 2, since the first and second die plates adjacent to each other in the longitudinal direction are separated, even if the first die plate is deformed, the second die plate adjacent thereto is deformed. Is hardly affected by. Therefore, the precision of the shape of the punched metal product can be further improved.

Example 3. In the apparatus (100) of Example 2, the first die plate (D43) may be arranged in the recess (E4) provided in the die holder (220). In this case, since the die holder is present around the first die plate, even if the first die plate is deformed, the deformation is restrained by the die holder. Therefore, the positional deviation of the die hole is less likely to occur, and the precision of the shape of the punched metal product can be further improved.

Example 4. The apparatus (100) of Example 3 may further include a metal liner (D45) disposed between the first die plate (D43) and the recess (E4). In this case, the mounting position of the first die plate with respect to the die holder can be finely adjusted by the metal liner. Further, since the metal liner is interposed between the die holder and the first die plate, they are not in direct contact with each other, so that both can be protected together.

Example 5. In the device (100) according to any one of Examples 2 to 4, the first die hole (D43a) may be a long hole extending in the width direction of the metal plate (ES) when viewed from above. In this case, the first die plate is more easily deformed in the longitudinal direction due to the lateral load during the punching process, but the first and second die plates adjacent to each other in the longitudinal direction are separated from each other, so that the first die plate is separated from the first die plate. The second die plate adjacent to the die plate is hardly affected by the deformation. Therefore, the precision of the shape of the punched metal product can be further improved.

Example 6. In the device (100) of Example 5, the first die hole (D43a) has a yoke corresponding region (D43b) extending linearly in the width direction of the metal plate (ES) and a metal plate (from the yoke corresponding region (D43b). It may include a plurality of teeth corresponding regions (D43c) protruding in the longitudinal direction of the ES) and arranged in a line at a predetermined interval in the width direction of the metal plate (ES). In this case, since the first die hole has a particularly elongated shape in the width direction, the first die plate is more easily deformed in the longitudinal direction due to the lateral load during the punching process. However, since the first and second die plates adjacent to each other in the longitudinal direction are separated from each other, the second die plate adjacent to the first die plate is hardly affected by the deformation. Therefore, the precision of the shape of the punched metal product can be further improved.

Example 7. In the device (100) according to any one of Examples 1 to 6, the surfaces of the first and second die plates (D43, D33) may be located above the surface of the die holder (220). In this case, when the surfaces of the first and second die plates are ground for maintenance of the mold device, the grinding wheel is prevented from coming into contact with the die holder. Therefore, it is possible to suppress the wear of the die holder. Further, when the die holder is made of a raw material, the grinding wheel does not come into contact with the die holder, so that it is possible to suppress clogging of the grinding wheel.

DESCRIPTION OF SYMBOLS 1... Stator laminated iron core, 2... Yoke part, 3... Teeth part, 10... Manufacturing device, 100... Mold device, 200... Lower mold, 220... Die holder, 300... Upper mold, D1-D4... Die member, D32. ... Die plate (second die plate), D33... Die (second die), D42... Die plate (first die plate), D43... Die (first die), D43a... Die hole (first Die hole), D43b... Yoke corresponding region, D43c... Teeth corresponding region, D45... Metal liner, E1 to E4... Recess, ES... Electromagnetic steel plate (metal plate), P3... Punch (second punch), P4... Punch (1st punch), St... laminated body, W... punching member.

Claims (7)

First and second die plates held by the die holder so as to be arranged in a line in the longitudinal direction of the strip-shaped metal plate;
A first die held by the first die plate and provided with a first die hole passing therethrough;
A second die held by the second die plate and provided with a second die hole penetrating itself;
A first punch arranged so as to face the first die and configured to be insertable into and removable from the first die hole;
A second punch disposed so as to face the second die and configured to be insertable into and removable from the second die hole,
A mold apparatus in which the first die plate and the second die plate are separated from each other in the longitudinal direction. The apparatus of claim 1, wherein the first die is a die for die cutting. The apparatus according to claim 2, wherein the first die plate is disposed in a recess provided in the die holder. The apparatus of claim 3, further comprising a metal liner disposed between the first die plate and the recess. The said 1st die hole is an apparatus as described in any one of Claims 2-4 which is a long hole extended in the width direction of the said metal plate seeing from above. The first die hole is
A yoke corresponding region extending linearly in the width direction of the metal plate,
The device according to claim 5, further comprising a plurality of teeth corresponding regions protruding from the yoke corresponding region in the longitudinal direction of the metal plate and arranged in a row at a predetermined interval in the width direction of the metal plate. The apparatus according to claim 1, wherein the surfaces of the first and second die plates are located above the surface of the die holder.

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