JP2012044800A - Core molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core molding device for precisely separating a depression member from a peripheral face of a core after the core is depressed to the peripheral face by the depression member.SOLUTION: A plurality of core pieces Wa are arranged by depressing the peripheral face of the core W where the plurality of core pieces Wa are laminated to a radial direction. Moving members 20 which can relatively move to the core W in an axial direction are installed. Depression members 21 for depressing the peripheral face of the core W are oppositely arranged in the moving members 20. Cam mechanisms 22, displacing the depression members 21 to depression positions to the peripheral face of the core W when the moving members 20 move to one direction along the axial direction of the core W, are installed between the moving members 20 and the depression members 21. Coupling mechanisms 29, coupling both the members and separating the depression members 21 from the peripheral face of the core W when the moving members 20 are moved to the other direction, are arranged between the moving members 20 and the depression members 21.

Description

  The present invention relates to a device for forming a core such as a rotor core and a stator core in a rotating electric machine such as a motor, and more particularly to radially press a peripheral surface of a core in which a plurality of core pieces are laminated. Thus, the present invention relates to a core forming apparatus in which the core pieces are aligned.

  Conventionally, as this type of core molding apparatus, for example, a configuration as disclosed in Patent Document 1 has been proposed. In this conventional configuration, a core piece is punched and laminated from a metal material by a punch and a die. In the lower part of the die, a plurality of pressing members for pressing the core pieces already punched and stacked from the outer periphery in the radial direction are arranged. A cam member is disposed on the outer side of each pressing member so as to be movable in the axial direction of the core. When the crank angle detector detects that the punch has reached bottom dead center, the cam member is moved in one direction along the axial direction of the core by an actuator such as a fluid cylinder, and the pressing member is It is moved to a pressing position with respect to the outer periphery of the core piece.

Japanese Patent Publication No. 3-11855

  However, in this conventional core forming apparatus, each pressing member is in contact with the cam member via the inclined cam surface. For this reason, when the pressing member is moved to the pressing position with respect to the outer periphery of the core piece and fixed to the outer peripheral surface of the core piece, the cam member is returned to the other direction along the axial direction of the core by the actuator. Even if moved, there is a problem that the pressing member is maintained at the pressing position and may not be separated from the outer peripheral surface of the core piece.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a core molding apparatus that can accurately separate the pressing member from the peripheral surface of the core after the pressing member presses the peripheral surface of the core.

  In order to achieve the above object, the present invention provides a core molding apparatus in which core pieces are aligned by pressing the peripheral surface of the core in a state in which a plurality of core pieces are laminated in a radial direction. A moving member that can move relative to the core in the axial direction, a pressing member that is disposed to face the moving member and presses the peripheral surface of the core, and is provided between the moving member and the pressing member. When the moving member is relatively moved in one direction along the axial direction of the core, the cam means for displacing the pressing member to the pressing position with respect to the peripheral surface of the core, and the moving member and the pressing member are connected, The moving member is provided with a connecting means for separating the pressing member from the peripheral surface of the core when the moving member is relatively moved in the other direction along the axial direction of the core.

  Therefore, in this invention, when the moving member is relatively moved in one direction along the axial direction of the core, the pressing member is displaced to the pressing position with respect to the peripheral surface of the core via the cam means, so that each core of the core The pieces are aligned in a stacked state. Thereafter, when the moving member is relatively moved in the other direction along the axial direction of the core, the pressing member is moved to a position away from the peripheral surface of the core via the connecting means. Therefore, even when the pressing member is pressed against the peripheral surface of the core at the pressing position with respect to the peripheral surface of the core, the pressing member can be accurately separated from the peripheral surface of the core, and the pressing member is pressed. It is possible to prevent the risk of being maintained in the position.

The said structure WHEREIN: It is preferable that the said moving member and a press member are arrange | positioned on the outer side of a core, and a press member presses the outer peripheral surface of a core.
The said structure WHEREIN: It is preferable that the said moving member and a press member are arrange | positioned on the outer side of a core, and a press member presses the internal peripheral surface of a core.

In the above configuration, the connecting means may be configured by a long hole provided in one of the moving member and the pressing member, and a pin provided in the other so as to loosely fit in the long hole.
The said structure WHEREIN: It is good to provide the setting means for setting the press-contact force of the press member with respect to a core.

  As described above, according to the present invention, after pressing the peripheral surface of the core by the pressing member, the effect that the pressing member can be accurately separated from the peripheral surface of the core is exhibited.

Sectional drawing which shows the core shaping | molding apparatus of 1st Embodiment. Sectional drawing in the 2-2 line | wire in FIG. Sectional drawing which shows the shaping | molding operation state of a core in the core shaping | molding apparatus of FIG. Sectional drawing which shows the shaping | molding operation state of the core from which lamination | stacking thickness differs in the core shaping | molding apparatus. Sectional drawing which shows the core shaping | molding apparatus of 2nd Embodiment. (A) is a fragmentary sectional view which expands and shows a part of core forming apparatus of FIG. (B) is a fragmentary sectional view which shows the operation state of (a). Sectional drawing in the 7-7 line | wire in Fig.6 (a). Sectional drawing which shows the shaping | molding operation state of a core in the core shaping | molding apparatus of FIG.

(First embodiment)
Below, 1st Embodiment of the core shaping | molding apparatus which actualized this invention is described according to FIGS. In this embodiment, the permanent magnets M are stored in advance in a plurality of receiving holes H penetrating the core W such as a rotor core of a motor formed by stacking a plurality of core pieces Wa, and this state In the core forming apparatus, a resin material such as an epoxy resin is injected into each accommodation hole H and molded.

  As shown in FIG. 1, the molding die 11 is composed of an upper die 12 and a lower die 13 that is disposed opposite to the lower portion of the upper die 12 so as to be openable and closable. A cradle 14 is disposed on the lower mold 13. The core W is mounted on the cradle 14 with the spacer 15a supported on the pallet 15 and the cull plate 16 mounted on the upper end. A gate plate 17 is disposed on the lower surface of the upper mold 12 so as to face the cull plate 16. As shown in FIG. 3, when the lower mold 13 is closed with respect to the upper mold 12, a gate 18 connected to the housing hole H of the core W is formed between the cull plate 16 and the gate plate 17. . The upper mold 12 is provided with a plunger 19 for injecting a resin material into the accommodation hole H of the core W through the gate 18.

  As shown in FIGS. 1 and 2, a plurality (four in the embodiment) of moving members 20 are disposed on the lower surface of the upper mold 12 so as to correspond to the outer peripheral surface of the core W on the lower mold 13. Yes. An accommodation groove 20 a extending along the axial direction of the core W is formed on the inner surface of each moving member 20. When the lower mold 13 is opened and closed with respect to the upper mold 12, the moving member 20 is moved relative to the core W on the lower mold 13 in the axial direction. A pressing member 21 for pressing the outer peripheral surface of the core W is accommodated in the accommodating groove 20a of each moving member 20 so as to be relatively movable in the axial direction and the radial direction of the core W.

  A cam mechanism 22 serving as cam means is provided between each moving member 20 and the pressing member 21. The cam mechanism 22 includes an inclined cam surface 23 formed on the inner surface of the receiving groove 20 a of the moving member 20 and an inclined cam surface 24 formed on the outer surface of the pressing member 21 so as to be in sliding contact with the inclined cam surface 23. It consists of and. At the lower end of each pressing member 21, an engaging projection 25 is provided so as to project. The lower mold 13 is provided with a plurality of cushioning air cylinders 26, and the piston rods 26 a of the air cylinders 26 are disposed so as to be engageable with the engaging protrusions 25 of the pressing members 21. The air cylinder 26 constitutes setting means for setting the pressure contact force of the pressing member 21 against the core W. That is, the engagement protrusion 25 of the pressing member 21 engages with the piston rod 26a, and the piston rod 26a moves backward according to the air pressure in the air cylinder 26, so that the pressure applied to the pressing member 21 is released. Therefore, by adjusting the pressure of the air supplied into the air cylinder 26, the pressing force of the pressing member 21 to the core W is set.

  When the lower mold 13 is moved from the mold open state shown in FIG. 1 to the mold closed state shown in FIG. 3 with respect to the upper mold 12, the engagement protrusion 25 of the pressing member 21 on the piston rod 26 a of each air cylinder 26. Are engaged, and each pressing member 21 is moved relative to the moving member 20 in the axial direction of the core W. At this time, each pressing member 21 is moved inward by the cam action accompanying the sliding contact between the both inclined cam surfaces 23 and 24 of the cam mechanism 22 and is displaced to the pressing position with respect to the outer peripheral surface of the core W. By this displacement, the outer peripheral surface of the core W is pressed inward in the radial direction, and the core pieces Wa of the core W are aligned in a stacked state.

  Further, as shown in FIG. 3, when the engagement protrusion 25 of the pressing member 21 is engaged with the piston rod 26 a of the air cylinder 26, the impact caused by the engagement is mitigated by the buffering action of the air cylinder 26. Further, as shown in FIG. 4, when forming the core W having a small number of stacked core pieces Wa, the air supply to the air cylinder 26 is adjusted, and the piston rod 26a is disposed at the immersive position. The mold 13 is closed with a larger stroke than the above case with respect to the upper mold 12. By this operation, the engaging protrusion 25 of the pressing member 21 is engaged with the piston rod 26a of each air cylinder 26, and each pressing member 21 is displaced to the pressing position and engaged as in the above case. The accompanying impact is alleviated.

  As shown in FIG. 1, the pallet 15 that supports the cradle 14 and the core W on the lower mold 13 is provided with a plurality of through holes 27 and 28 corresponding to the moving members 20 and the pressing members 21. Yes. As shown in FIG. 4, when the core W having a small number of stacked core pieces Wa is formed, when the lower mold 13 is closed with a large stroke with respect to the upper mold 12, each moving member 20 and the pressing member The lower end portion of 21 is inserted into these through holes 27, 28, so that interference between each moving member 20 and pressing member 21, cradle 14 and pallet 15 is suppressed.

  As shown in FIGS. 1 and 2, a connecting mechanism 29 is provided between the moving members 20 and the pressing member 21 as connecting means for connecting the members 20 and 21. The connecting mechanism 29 is provided on the side of the pressing member 21 so as to be loosely fitted in the long hole 30 formed so as to extend in an inclined manner along the inclined cam surface 23 on the moving member 20 side. The pin 31 is configured. Then, the lower mold 13 is moved with respect to the upper mold 12 from the mold closed state shown in FIG. 3 to the mold open state shown in FIG. 1, and the piston rod 26 a of each air cylinder 26 is moved from the engagement protrusion 25 of the pressing member 21. When separated, each pressing member 21 is moved relative to the moving member 20 in the axial direction of the core W by its own weight. At this time, the pin 31 of the coupling mechanism 29 is moved from the upper end side to the lower end side along the inclined long hole 30, so that the pressing member 21 is moved to a position away from the outer peripheral surface of the core W.

Next, the operation of the core forming apparatus configured as described above will be described.
In this core molding apparatus, a core W formed by laminating a plurality of core pieces Wa is supported on a pallet 15 in a state where a lower mold 13 for molding 11 is opened with respect to an upper mold 12. Then, it is carried on and placed on the cradle 14 of the lower mold 13. In this state, when the lower mold 13 is closed and moved with respect to the upper mold 12, the core W is sandwiched between the upper mold 12 and the lower mold 13 in the stacking direction as shown in FIG. At the same time, due to the engagement between the piston rod 26 a of each air cylinder 26 and the engagement protrusion 25 of each pressing member 21, each pressing member 21 is moved relative to the moving member 20 upward in the axial direction of the core W. The In this case, since the cam mechanism 22 including the inclined cam surfaces 23 and 24 is provided between each pressing member 21 and the moving member 20, each pressing member 21 is connected to the core W by the cam action of the cam mechanism 22. It is displaced to a pressing position with respect to the outer peripheral surface. As a result, the outer peripheral surface of the core W is pressed radially inward by the pressure set by the air cylinder 26 by each pressing member 21, and the core pieces Wa of the core W are aligned in a stacked state.

  Further, when the lower mold 13 is moved to close the upper mold 12 as described above, as shown in FIG. 3, the cull plate 16 mounted on the core W and the gate plate 17 on the lower surface of the upper mold 12. In between, the gate 18 connected to the accommodation hole H of the core W is formed. In this state, when the plunger 19 on the upper mold 12 is operated, the resin material is injected into the accommodation hole H of the core W through the gate 18. By this injection, the permanent magnet M previously accommodated in the accommodation hole H of the core W is integrally fixed in the accommodation hole H via the resin material.

  Thereafter, when the lower mold 13 is moved with respect to the upper mold 12 from the mold closed state shown in FIG. 3 to the mold open state shown in FIG. Separated from the piston rod 26a. At this time, each pressing member 21 is moved relative to the lower side in the axial direction of the core W with respect to the moving member 20 by its own weight. Then, since the pin 31 of the coupling mechanism 29 is moved from the upper end side to the lower end side along the inclined long hole 30, the pressing member 21 is moved to a position away from the outer peripheral surface of the core W. In this case, even if the pressing member 21 is pressed and fixed to the outer peripheral surface of the core W at the pressing position, the pressing member 21 is appropriately separated from the outer peripheral surface of the core W without being maintained at the pressing position. Is done. That is, when the pressing state in which the pressing member 21 is in close contact with the outer peripheral surface of the core W is maintained, the lower end of the long hole 30 pulls up the pin 31 of the pressing member 21 by the rising of the moving member 20. For this reason, the pressing member 21 is moved from the pressure contact state with respect to the core W and is separated from the outer peripheral surface of the core W.

Therefore, according to this embodiment, the following effects can be obtained.
(1) In this core forming apparatus, when the moving member 20 is relatively moved in one direction along the axial direction of the core W, the pressing member 21 is brought into a pressing position with respect to the peripheral surface of the core W via the cam mechanism 22. By being displaced, the core pieces Wa of the core W are arranged in a stacked state. Further, when the moving member 20 is relatively moved in the other direction along the axial direction of the core W after that, the pressing member 21 is connected to the peripheral surface of the core W via the long hole 30 and the pin 31 via the connecting mechanism 29. It moves to the position which is separated from. For this reason, even when the pressing member 21 is pressed against and fixed to the peripheral surface of the core W at the pressing position with respect to the peripheral surface of the core W, the pressing member 21 can be appropriately separated from the peripheral surface of the core W. .

  (2) In this core forming apparatus, the pressing member 21 is configured to press the outer peripheral surface of the core W. For this reason, by pressing the core W from the outer peripheral surface side with the pressing member 21, the core pieces Wa of the core W can be accurately aligned in the laminated state.

  (3) In this core molding apparatus, the coupling mechanism 29 is provided on the other side so as to loosely fit into the long hole 30 provided in one of the moving member 20 and the pressing member 21 and the long hole 30. And the pin 31 formed. For this reason, the structure of the coupling mechanism 29 is simple, and the pressing member 21 can be appropriately separated from the peripheral surface of the core W as the moving member 20 returns.

  (4) In this core molding apparatus, the moving member 20 is moved relative to the core W in the axial direction in accordance with the opening and closing operations of the upper and lower molds 12 and 13 for molding. Therefore, it is not necessary to provide another drive member for relatively moving the moving member 20, and the configuration of the apparatus can be simplified.

  (5) In this core forming apparatus, the pressure contact force against the core W by the pressing member 21 is set according to the adjusted air pressure in the air cylinder 26. Therefore, the pressing member 21 can be prevented from contacting the core W with excessive pressure, and excessive biting of the pressing member 21 against the core W can be prevented.

(Second Embodiment)
Next, a second embodiment of the core forming apparatus embodying the present invention will be described with a focus on differences from the first embodiment with reference to FIGS.

  In the second embodiment, as shown in FIGS. 5 and 8, the upper mold 12 side of the molding mold 11 is opened and closed with respect to the lower mold 13. Plunger unit 35 including plunger 19 is supported on upper mold 12 so as to be movable along the axial direction of core W on lower mold 13. A through hole 36 is formed in the center of the lower mold 13. In the lower center of the lower mold 13, a lifting platform 37 is disposed so as to be movable up and down. On the table 38 that supports the lower mold 13, a plurality of first cylinders 39 for raising and lowering the lifting platform 37 are disposed. A second cylinder 40 is supported at the center of the upper surface of the lifting platform 37. One moving member 20 is attached to the upper end of the piston rod 40 a of the second cylinder 40 so as to be positioned in the through hole 36 of the lower mold 13.

  As shown in FIGS. 6 and 7, in this embodiment, the moving member 20 is formed in an inverted frustoconical shape, and a plurality of (four in the embodiment) projecting pieces 41 are formed on the outer periphery of the moving member 20. They are formed at angular intervals. Four pressing members 21 are supported on the outer side of the upper surface of the lifting platform 37 so as to be positioned on the outer peripheral side of the moving member 20 via the mount 42. An accommodation groove 43 for accommodating the protruding piece 41 of the moving member 20 is formed inside the upper end of the pressing member 21. In this embodiment, as shown in FIG. 8, the inner circumferential surface of the core W is pressed toward the outer side in the radial direction by the pressing member 21.

  Further, in this embodiment, the cam means includes the inclined cam surface 23 provided on the outer peripheral surface of the moving member 20 having an inverted truncated cone shape and the inclined cam surface 24 provided on the inner surface of each pressing member 21. The cam mechanism 22 is configured. Furthermore, it connects by the long hole 30 provided in the both sides of the accommodation groove | channel 43 of each press member 21, and the pin 31 inserted in each protrusion 41 on the moving member 20 so that it may loosely fit in the long hole 30. A connecting mechanism 29 as means is configured.

Next, the operation of the core forming apparatus of this embodiment will be described.
As shown in FIG. 5, when the upper mold 12 is closed and moved downward relative to the lower mold 13 with the core W placed on the lower mold 13 in the mold open state, as shown in FIG. 8. The core W is sandwiched between the upper mold 12 and the lower mold 13 in the stacking direction. In this state, when the first cylinder 39 is protruded, the lifting platform 37 is raised from the lowered position shown in FIG. 5, and the moving member 20 and each pressing member 21 are inserted into the core W from the through hole 36 of the lower mold 13. Inserted inside, the pressing member 21 is disposed opposite to the inner peripheral surface of the core W. Subsequently, when the second cylinder 40 is immersed, as shown in FIG. 8, the moving member 20 is moved downward relative to the pressing member 21, and each pressing member 21 is moved by the cam action of the cam mechanism 22. The core W is displaced to a pressing position with respect to the inner peripheral surface. By this displacement, the inner peripheral surface of the core W is pressed outward in the radial direction, and the core pieces Wa of the core W are aligned in a stacked state.

  In this state, in the same manner as in the first embodiment, the operation of the plunger unit 35 including the plunger 19 causes the resin material to be injected into the accommodation hole H of the core W through the gate 18, and the inside of the accommodation hole H The permanent magnet M accommodated and arranged in advance is fixed integrally. Thereafter, the second cylinder 40, the first cylinder 39 and the upper mold 12 are operated in the reverse direction in the reverse order to the above-described case, and the mold opening is performed.

  That is, when the second cylinder 40 is protruded in the state shown in FIG. 8, the moving member 20 is moved upward relative to the pressing member 21. By this relative movement, the pin 31 of the coupling mechanism 29 is moved along the inclined long hole 30 from the lower end side shown in FIG. 6B to the upper end side shown in FIG. It is moved to an inner position away from the inner peripheral surface of W. Subsequently, when the first cylinder 39 is immersed, the elevating platform 37 is lowered from the raised position shown in FIG. 8, and the moving member 20 and each pressing member 21 are lowered from the inside of the core W as shown in FIG. It is immersed in the through hole 36 of the mold 13. Thereafter, the upper mold 12 is moved upward to open with respect to the lower mold 13 so that the upper portion of the core W is opened.

Therefore, according to the second embodiment, in addition to the effects described in (1) to (3) and (5) in the first embodiment, the following effects can be obtained.
(6) In this core molding apparatus, the pressing member 21 is configured to press the inner peripheral surface of the core W. For this reason, by pressing the core W from the inner peripheral surface side to the outside by the pressing member 21, the core pieces Wa of the core W can be accurately aligned in the laminated state. Moreover, when the some press member 21 is opposingly arranged on the internal peripheral surface of the core W, those press members 21 can be operated with the one moving member 20, and a structure can be simplified.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
In the first embodiment, the number of the moving members 20 and the pressing members 21 is changed to 2 or 3 or 5 or more.

In the second embodiment, the number of pressing members 21 is changed to 2, 3 or 5 or more.
-The cam means and the connecting means should be integrated. That is, in the first and second embodiments, the inclined cam surfaces 23 and 24 are omitted, and the inclined inner surface of the long hole 30 serving as the connecting means is replaced with the inclined cam surfaces 23 and 24 as cam means. . In this case, it is preferable to provide a plurality of long holes 30 and pins 31 along the moving direction of the moving member 20.

  The long hole 30 constituting the connecting means is provided on the moving member 20 side, and the pin 31 is provided on the pressing member 21 side.

  DESCRIPTION OF SYMBOLS 11 ... Mold for shaping | molding, 12 ... Upper die, 13 ... Lower die, 20 ... Moving member, 20a ... Accommodating groove, 21 ... Pressing member, 22 ... Cam mechanism as cam means, 23, 24 ... Inclined cam surface, 29 A connecting mechanism as a connecting means, 30 ... a long hole, 31 ... a pin, 37 ... a lifting platform, 39 ... a first cylinder, 40 ... a second cylinder, W ... a core, Wa ... a core piece.

Claims (5)

In the core molding apparatus in which the core pieces are aligned by pressing the peripheral surface of the core in a state where a plurality of core pieces are laminated in the radial direction,
A moving member that is movable relative to the core in the axial direction;
A pressing member arranged to face the moving member and pressing the peripheral surface of the core;
Cam means provided between the moving member and the pressing member, and when the moving member is relatively moved in one direction along the axial direction of the core, cam means for displacing the pressing member to a pressing position with respect to the peripheral surface of the core;
The moving member and the pressing member are connected to each other, and when the moving member is relatively moved in the other direction along the axial direction of the core, connecting means is provided for separating the pressing member from the peripheral surface of the core. Core forming device. The core forming apparatus according to claim 1, wherein the moving member and the pressing member are disposed outside the core, and the pressing member presses the outer peripheral surface of the core. The core forming apparatus according to claim 1, wherein the moving member and the pressing member are disposed outside the core, and the pressing member presses the inner peripheral surface of the core. 2. The connecting means is constituted by a long hole provided in one of the moving member and the pressing member, and a pin provided in the other so as to loosely fit in the long hole. The core shaping | molding apparatus as described in any one of -3. The core forming apparatus according to claim 1, further comprising a setting unit configured to set a pressure contact force of the pressing member with respect to the core.