JP6600166B2 - Progressive press working method - Google Patents

Description

  The embodiment relates to a progressive press working method.

  For example, some rotary electric machines have a stator core or a rotor core formed by laminating a plurality of punched plates in the axial direction. This punched plate is punched from a belt-like plate with a progressive press device, and the thickness of the punched plate has been increased for the purpose of improving the efficiency of the rotating electrical machine. When this punched plate is thinned, it is necessary to secure the stack thickness of the stator core by increasing the number of stacked punched plates. Therefore, by increasing the transport speed of the strip plate, There is a need to increase productivity. However, when the punched plate is thinned, the clearance of the mold becomes narrow, so it is practically difficult to increase the conveyance speed of the belt-shaped plate in terms of the life and safety of the mold.

JP 2012-178920 A

  Conventionally, a plurality of strip plates are transported to a mold in a state of overlapping each other, and stamping plate productivity is ensured by applying press processing to the plurality of strip plates in a state of overlapping each other. It was. In the case of this progressive pressing method, a plurality of strip plates are not dispersed during press processing, or the positional relationship between the plurality of strip plates is not stable, and the press processing is overlapped on the plurality of strip plates. It was difficult to apply smoothly in the state.

  The progressive press working method of the embodiment includes a transporting step of sequentially transporting a plurality of strips to a plurality of processing stages in a state of overlapping each other, and sequentially pressing the plurality of strips on the plurality of processing stages. A pressing step and a caulking step for caulking the strips on the upstream side in the conveying direction as compared with the first step of performing press processing on the strips first among the plurality of processing stages. Is.

The figure which shows Example 1 (The figure which shows the external appearance of a stator core) Diagram showing progressive press machine Diagram showing strip steel plate The figure which shows a V type caulking part (A) is a figure which shows a pilot hole, (b) is a figure which shows a circular crimp part and a pilot hole.

  A stator core 1 in FIG. 1 constitutes a three-phase synchronous motor used as a drive source for a hybrid vehicle. The stator core 1 is configured by laminating a plurality of stator punching plates 4 in the axial direction, and includes a yoke 5, a plurality of teeth 6, and a plurality of attachment pieces 7. The yoke 5 has a cylindrical shape, the plurality of teeth 6 project inward from the inner peripheral surface of the yoke 5, and the plurality of attachment pieces 7 project outward from the outer peripheral surface of the yoke 5. Each of the plurality of attachment pieces 7 has a through hole 8, and the stator core 1 is fixed by screwing a screw into a seating surface through each of the plurality of through holes 8. The stator core 1 corresponds to a laminated core, and the stator punched plate 4 corresponds to a punched plate.

  2 includes an uncoiler 11, a leveler 12, and a press machine 13. The uncoiler 11 has an upper drive shaft 14 and a lower drive shaft 15, and each of the upper drive shaft 14 and the lower drive shaft 15 is rotatable about an axis. The upper drive shaft 14 and the lower drive shaft 15 are arranged with their positions shifted in the vertical direction and the left-right direction, and each of the upper drive shaft 14 and the lower drive shaft 15 is a strip-shaped steel sheet wound in a coil shape. 16 is mounted. The strip steel plate 16 corresponds to a strip plate.

  Each of the strip-shaped steel plates 16 is composed of the same electromagnetic steel plate, including the plate thickness, width dimension, grade, material, directionality, etc., and the plate thickness is set to 0.3 mm or less. As shown in FIG. 2, each of the strip steel plates 16 is rewound in the direction of the arrow X, and between the unwinding portions of the strip steel plates 16, the strip steel plate 16 of the upper drive shaft 14 is on the lower drive shaft. Fifteen strip steel plates 16 are stacked in the vertical direction so as to be on the bottom.

  As shown in FIG. 2, the leveler 12 is disposed on the arrow X direction side of the uncoiler 11, and has an upper roller 17 and a lower roller 18. Each of the upper roller 17 and the lower roller 18 is rotatable about an axial center line, and is opposed to each other in the vertical direction. Between the upper roller 17 and the lower roller 18, the unwinding portions of the two strip steel plates 16 are inserted in a state where they are overlapped in the vertical direction. These upper roller 17 and lower roller 18 plastically deform both strip steel plates 16 by applying an external force to both strip steel plates 16, and remove curl from both strip steel plates 16 by plastic deformation of both strip steel plates 16. To do.

  As shown in FIG. 2, an oil film 19 is formed on one of the upper sides of the two strip steel plates 16. This oil film 19 is formed by adhering the punching oil to the lower surface of the upper strip steel plate 16 by spraying. And between the levelers 12. The oil film 19 is smoothly sheared by lubricity, and the belt-like steel plates 16 are temporarily fixed in contact with each other by the viscosity of the oil film 19 when passing through the leveler 12.

  As shown in FIG. 2, the press machine 13 is installed on the side of the leveler 12 in the direction of the arrow X, and includes a feeder. This feeder has two rollers that can rotate around an axis. These two rollers are opposed to each other in the vertical direction, and both strip steel plates 16 are inserted between the two rollers in contact with each other. One of these two rollers is connected to an electrical drive source. This drive source rotates one roller in one direction, and both strip steel plates 16 are transported while being in contact with each other in the direction of arrow X in response to the rotation of one roller.

  The press machine 13 is a mechanical press that converts the rotary motion of the press motor into a linear reciprocating motion, and includes an upper die 20 and a lower die 21 as shown in FIG. The upper die 20 supports the punch P1, the punch P2, and the punch P3, and repeats reciprocation between the top dead center and the bottom dead center in the operation state of the press motor. The lower die 21 supports the die D1, the die D2, and the die D3. These dies D1 to D3 are arranged at a constant pitch P in a line from the counter arrow X direction to the arrow X direction. When the upper die 20 is raised, the punch P1 faces the die D1 from above, and the punch P2 Faces the die D2 from above, and the punch P3 faces the die D3 from above.

  The feeder of the press machine 13 conveys both strip steel plates 16 intermittently from the opposite arrow X direction to the arrow X direction. This conveyance pitch is set to the same value P as the arrangement pitch of the dies D1 to D3, and the two steel strips 16 are intermittently conveyed at the conveyance pitch P and remain in contact with each other as “die D1 and punch P1. “Between”, “Between die D2 and punch P2,” “Between die D3 and punch P3”. As shown in FIG. 3, the dies D1 to D3 and the punches P1 to P3 punch the stator punched plates 4 in two rows from both the strip-shaped steel plates 16 by shearing the both strip-shaped steel plates 16. The feeder stops the conveyance of both the strip-shaped steel plates 16 at the timing when the shear processing is applied to both the strip-shaped steel plates 16.

  As shown in FIG. 3, the die D1 and the punch P1 constitute a processing stage S1. In the processing stage S1, a plurality of long holes 22 are sheared into two rows in the short-side direction in both strip steel plates 16. . Each of the plurality of long holes 22 in each row serves as a slot for the stator core 1 and is arranged on a circular locus.

  As shown in FIG. 3, the die D2 and the punch P2 constitute a processing stage S2. In the processing stage S2, the circular plates 3 are punched from the two strip-shaped steel plates 16 in two rows in the short direction. The die D3 and the punch P3 constitute a processing stage S3. In the processing stage S3, the stator punching plates 4 are punched from the two strip-shaped steel plates 16 in two rows in the short direction. The stator punching plate 4 falls into the die D3, and the stator punching plate 4 is directed from the bottom to the top in the die D3 in accordance with repeated punching of the stator punching plate 4. Are stacked in order.

  The lower die 21 supports the caulking die KD1 as shown in FIG. The caulking die KD1 is disposed on the opposite side of the die D1 in the direction of the arrow X, and the upper die 20 supports the caulking punch KP1. The caulking punch KP1 faces the caulking die KD1 from above when the upper die 20 is raised, and reference numeral KS1 in FIG. 3 is a caulking stage including the caulking die KD1 and the caulking punch KP1.

  As shown in FIG. 3, the caulking stage KS1 is formed by forming six V-shaped caulking portions 23 on both strip-shaped steel plates 16 in two rows in the lateral direction. As shown in FIG. 4, each of the six V-shaped caulking portions 23 in each row has a V-shape in which the central portion in the circumferential direction is recessed to the bottom. The six V-type caulking portions 23 are engaged with each other.

  As shown in FIG. 3, the six V-shaped caulking portions 23 in each row of the two strip steel plates 16 are arranged on a circular locus. Each of the six V-shaped caulking portions 23 in each row is formed in a portion that becomes the yoke 5 of both the strip-shaped steel plates 16, and two stator punched plates are formed every time shearing is performed in the processing stage S3. 4 falls into the die D3 of the lower die 21 in an engaged state via the V-type caulking portion 23. This stator punching plate 4 is laminated in the axial direction as a set of two after being taken out from the die D3, and each of the six V-type caulking portions 23 is adjacent to the set in the axial direction. By being press-fitted into the V-type caulking portion 23 of the stator punching plate 4, the stators are combined in a stacked state.

  As shown in FIG. 3, the caulking stage KS <b> 1 forms two lower holes 24 (see a in FIG. 5) having a circular shape in both strip-shaped steel plates 16. One of the two pilot holes 24 is formed at one end portion in the short direction of the two strip-shaped steel plates 16, and the other is formed at the other end portion in the short direction of the two strip-shaped steel plates 16. The band-shaped steel plate 16 is formed into a portion that becomes a remaining material that does not become the stator punched plate 4.

  The lower die 21 supports the caulking die KD2 as shown in FIG. The caulking die KD2 is disposed between the caulking die KD1 and the die D1, and the upper die 20 supports the caulking punch KP2. This caulking punch KP2 faces the caulking die KD2 from above when the upper die 20 is raised, and reference numeral KS2 in FIG. 3 is a caulking stage including the caulking die KD2 and the caulking punch KP2.

  The caulking stage KS2 is one in which two pilot holes 25 are formed in both strip-shaped steel plates 16, as shown in FIG. Each of these two pilot holes 25 is obtained by burring the lower hole 24. As shown in FIGS. 5A and 5B, each of the two pilot holes 25 has a circular shape having a diameter larger than that of the lower hole 24. There is no. In each of these two pilot holes 25, a pilot pin is inserted. Each of these two pilot pins is supported by the upper mold 20, and both the strip-shaped steel plates 16 are arranged so that each of the two pilot pins is in the pilot hole 25 while the upper mold 20 is lowered from the top dead center to the bottom dead center. In response to entering the inside, it is positioned at the target position of the press 13. The pilot hole 25 corresponds to a positioning hole, and the pilot pin corresponds to a positioning pin.

  As shown in FIG. 5B, two circular caulking portions 26 are formed on both the strip-shaped steel plates 16. Each of these two circular caulking portions 26 has a cylindrical shape surrounding the pilot hole 25, and protrudes downward from both strip-shaped steel plates 16. Each of these two circular caulking portions 26 is formed by burring the two strip-shaped steel plates 16, and the two strip-shaped steel plates 16 are engaged by the two circular caulking portions 26. That is, the V-type caulking portion 23 and the circular caulking portion 26 join the two strip-shaped steel plates 16 on the upstream side in the conveying direction X of the two strip-shaped steel plates 16 as compared with the processing stage S1, and in the processing stages S1 to S3, The two strip steel plates 16 are subjected to shearing in a joined state between the two strip steel plates 16. Each of the V-type caulking portion 23 and the circular caulking portion 26 corresponds to a caulking portion.

According to the said Example 1, there exists the following effect.
Since the two strip steel plates 16 are caulked on the upstream side in the conveying direction X as compared with the processing stage S1 that first presses the strip steel plates 16 among the processing stages S1 to S3, the two strip steel plates 16 are processed in the processing stage S1. ~ S3 is conveyed in a joined state. Accordingly, when the two strip steel plates 16 are sheared at the processing stages S1 to S3, the two strip steel plates 16 are not dispersed, and the positional relationship between the two strip steel plates 16 is stabilized. It can be applied smoothly in a state of overlapping each other.

  Since both the strip-shaped steel plates 16 are conveyed in the caulked state, it is possible to prevent the heel width portions at both ends in the short direction of both the strip-shaped steel plates 16 from sagging due to insufficient strength particularly at the processing stage S3. Therefore, it is possible to prevent the width of the belt-shaped steel plates 16 from being caught by the stator punching plate 4 in the die D3 of the lower mold 21, so that the belt-shaped steel plates 16 can be transported smoothly.

  A V-type caulking portion 23 was formed in accordance with caulking between the two strip-shaped steel plates 16 at a portion to be the stator punching plate 4. Therefore, since a plurality of sets of stator punching plates 4 can be joined in a stacked state by caulking with the V-type caulking portion 23, the stacking operation of the plurality of sets of stator punching plates 4 is easy. become.

  Since the pilot hole 25 and the circular caulking portion 26 are formed in accordance with the burring process on both the strip-shaped steel plates 16, the positional relationship of the pilot holes 25 between the strip-shaped steel plates 16 does not shift. Therefore, since the pilot pins can be smoothly inserted and removed from both the pilot holes 25, there is a problem in the conveyance of the two strip steel plates 16 when the pilot pins are caught on the two strip steel plates 16. Can be prevented.

  Since the pilot hole 25 and the circular caulking portion 26 are formed in the flange portion of both the strip-shaped steel plates 16, the two strip-shaped steel plates 16 are joined by the flange portion. Therefore, since the strength of the ridge width portion of both the strip-shaped steel plates 16 is particularly increased, it is possible to reliably prevent the ridge width portion of the both strip-shaped steel plates 16 from being caught by the stator punched plate 4 in the die D3 of the lower mold 21. .

  The oil film 19 was formed by adhering the punching oil to the lower surface of the upper strip steel plate 16 before the two strip steel plates 16 overlap each other. Accordingly, when the belt-like steel plates 16 pass through the leveler 12, they are temporarily fixed by the viscosity of the oil film 19, so that when the V-type caulking portion 23 and the pilot hole 24 are formed on the belt-like steel plates 16 by the caulking stage KS1, both are formed. It can prevent that the strip | belt-shaped steel plates 16 disperse | distribute or that the positional relationship between both the strip | belt-shaped steel plates 16 is not stabilized. In addition, it is possible to prevent the blade for shearing from being damaged at the caulking stages KS1 to KS2 and the processing stages S1 to S3.

In the first embodiment, three or more strip steel plates 16 may be stacked in the vertical direction and conveyed to the press machine 13.
In the first embodiment, another press machine may be installed on the opposite side of the press machine 13 in the direction of the arrow X, and the two steel strips 16 may be caulked with the other press machine.

In the first embodiment, an electromagnetic steel plate having at least one of thickness, width dimension, grade, material, directionality and the like may be used as the both strip-shaped steel plates 16.
In the first embodiment, the band-shaped steel plates 16 may be caulked with portions that do not become the stator punched plates 4.

  In the first embodiment, when the rotor punched plate is punched from the two strip-shaped steel plates 16, the two strip-shaped steel plates 16 are caulked with a portion that becomes the rotor punched plate or a portion that does not become the rotor punched plate. Also good. This rotor punched plate is laminated to become a rotor.

In the first embodiment, a laminated iron core of a static induction device such as a transformer may be manufactured by the progressive pressing method of the present invention.
In Example 1 described above, a non-laminated punching plate that is a single product may be punched from a plurality of strip-shaped plates.

  As mentioned above, although the Example of this invention was described, this Example is shown as an example and is not intending limiting the range of invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention and are also included in the invention described in the claims and the equivalent scope thereof.

  S1 to S3 are processing stages, 4 is a stator punching plate (punching plate), 16 is a strip steel plate (strip plate), 23 is a V-type crimping portion (caulking portion), 25 is a pilot hole (positioning hole), 26 Is a circular caulking part (caulking part).

Claims (4)

A transporting step of transporting a plurality of strip-shaped plates to a plurality of processing stages in a state where they overlap each other;
A pressing step of sequentially pressing the plurality of strip-shaped plates at the plurality of processing stages;
A caulking step of caulking between the plurality of strip-shaped plates on the upstream side in the conveying direction as compared with the first stage of pressing the plurality of strip-shaped plates among the plurality of processing stages;
In the caulking step, a positioning hole into which a positioning pin provided in the die is inserted in order to position the strip and the die in the pressing step performs burring on the plurality of strips. A progressive press working method characterized by being formed by the following method. Prior Symbol pressing process, punching die of a plurality of laminate from the plurality of strip-shaped plate is punched,
In the caulking step, a caulking portion that is a portion for connecting a plurality of the punched plates in a laminated state by caulking, and is recessed in a V shape in the laminating direction, The progressive press working method according to claim 1, wherein the plurality of strip-shaped plates are formed on a portion to be the punched plate. Before SL The crimping process, the crimping section recessed into a V-shape in the stacking direction the plurality of strip-shaped plates comprising a portion of caulked is formed in the punching punched become part of the plurality of strip-shaped plate The progressive press working method according to claim 1, wherein the progressive press working method is performed.   4. The method according to claim 1, further comprising: an attaching step of attaching a punching oil to one surface of the belt-like plates that overlaps one adjacent one of the belt-like plates before the plurality of belt-like plates overlap each other. The progressive press processing method as described in any one of these.

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