JP4442175B2 - Wedge forming equipment - Google Patents

Description

  The present invention relates to a wedge forming apparatus that is accommodated in a coil accommodating slot formed on an inner peripheral surface of a stator core constituting a stator of a rotating electrical machine so as to close the open side thereof.

FIG. 6 shows a wedge magazine disclosed in Patent Document 1, and FIG. 7 shows a partial cross-sectional view showing a state in which the wedge is driven into the wedge magazine. As shown in FIG. 6, the guide rods 129 are arranged in an annular shape, and a wedge driving space 134 is formed between them. A driving guide 151 and a plate-like punch 152 are provided on one side of the outer periphery of the wedge magazine 132. The driving guide 151 includes a base plate 153 and a punch guide 154, and a wedge supply path 155 is formed in the center of the joint surface along the axial direction having a slit-like cross section. Further, when the wedge magazine 132 is at a predetermined rotation position, the punch guide groove 156 communicating with the wedge driving space 134 formed in the gap between the guide rods 129 of the wedge magazine 132 is orthogonal to the wedge supply path 155. In addition, it is formed through. A plate-like punch 152 is inserted into the punch guide groove 156 by a driving device (not shown) so as to be protruded and retractable as shown by an arrow X in FIG. Then, after inserting a continuous tape-shaped wedge into the wedge supply path 155, a wedge (not shown) is slid to cut the wedge into a length corresponding to the thickness of the stator core. That is, when the wedge 142 inserted into the wedge supply path 155 is struck toward the wedge driving space 134 with the punch 152, the wedge 142 is bent in a U shape as shown in FIG. An inserted technique is disclosed.
JP 9-103053 A (paragraphs 0022-0028, FIGS. 1 to 3)

  However, in Patent Document 1, when the wedge 142 is struck toward the wedge driving space 134 with the punch 152 and the wedge 142 is pressed and bent so as to follow the surface shape of the punch 152, it is formed into a substantially U shape. Since the folding line is formed on the wedge 142 only when it passes through the gap between the punch guide groove 156 and the guide rod 129, the bending of the wedge may be insufficient. If the wedge 142 is not sufficiently formed in the U-shape, when the wedge 142 is inserted into the slot of the stator core, the tip of the wedge 142 comes into contact with the slot paper during the insertion, and the insertion resistance increases. There is a possibility that the wedge 142 may buckle during insertion due to the force during insertion. When the wedge 142 is buckled, operations such as removal of the buckled wedge and reinsertion of a new wedge occur, which is a problem because work efficiency is lowered. Also, these operations are often performed manually, which is problematic because the wedge insertion operation cannot be automated. In addition, if the leading end of the wedge 142 contacts the slot paper while the wedge is being inserted, there is a possibility that the slot paper may be torn. If the slot paper is damaged, the motor may become defective due to a short circuit or the like, or the durability of the motor may be reduced and the quality of the motor may not be maintained.

  The present invention has been made to solve at least one of the above-described problems of the prior art, and in the bending process of the wedge for closing the slot opening, the bending can be performed without adding a new device or the like. An object of the present invention is to provide a wedge forming apparatus capable of sufficiently forming.

In order to achieve the above object, a wedge forming apparatus according to claim 1 includes a punched portion that bends both ends of a long side of a rectangular wedge to form a substantially U shape, and a wedge base paper before forming. a wedge shaped device and a roller portion for feeding the punching portion by sandwiching the roller unit may have a pre-processing unit to put a muscle folding bending position prior to the bending mold in the punching unit, the roller unit A first roller and a second roller for sandwiching the wedge base paper, wherein the preliminary processing portion includes a protrusion provided at a central portion of the wedge base paper sandwiching surface of the first roller, and a wedge of the second roller A die portion provided in the die, the die punching portion being disposed so that the die and the punch guide are in contact with each other. When A punch guide hole provided in the punch guide is disposed adjacent to the punch guide, and a contact surface between the die and the punch guide can hold a preprocessed wedge base paper supplied from the roller portion. A groove is provided, and in the vicinity of the punch guide hole, the punch is disposed so as to be able to penetrate the punch guide hole and the die hole .

  The wedge base paper before being formed is sent out to the punching part by the roller part. Preliminary processing for forming a crease at the bending position of the wedge base paper is performed by the preliminary processing portion of the roller portion. Thereafter, punching is performed in the punched portion by bending both ends of the long side of the wedge to form a substantially U shape.

  Accordingly, since the preliminary processing is performed by the preliminary processing portion, the bending processing is sufficiently performed when the both ends of the long side of the wedge are bent at the punch processing portion to form a substantially U shape. Therefore, when inserting the wedge into the slot of the stator core, it is possible to avoid the possibility that the leading end of the wedge comes into contact with the slot paper during the insertion, the insertion resistance increases, and the wedge is buckled by the force during insertion. Further, it is possible to avoid the possibility that the leading edge of the wedge contacts the slot paper during the wedge insertion and the slot paper is torn. In addition, since the pre-processed portion is provided in the existing roller portion, the pre-processing can be performed without adding new equipment for performing the pre-processing, and the increase in the manufacturing cost of the motor accompanying the capital investment can be suppressed.

  Since the wedge base paper is sandwiched between the protruding portion of the first roller and the concave portion of the second roller, the wedge base paper is pressed by the concave portion so as to follow the surface shape of the protruding portion, and the wedge base paper 2 has a folding line. It is formed. Thereby, the preliminary process which makes a crease in a bending position prior to the bending process in a punch process part is performed.

The molding apparatus of the wedge according to claim 2, characterized in that in the molding apparatus of the wedge according to claim 1, inter-axis distance between the rotation axis of the rotary shaft and the second roller of the first roller is adjustable And

  When the wedge base paper is sandwiched by adjusting the distance between the rotation axis of the first roller and the rotational axis of the second roller while the wedge base paper sandwiching surfaces of the first roller and the second roller are in contact with each other. The load applied to the wedge base paper can be adjusted.

  As a result, by selecting the optimum load according to the material, thickness, etc. of the wedge base paper, it is possible to prevent a situation in which the wedge is cracked by forming a folding line more than necessary during preliminary processing. In addition, even a wedge that is difficult to be molded can be sufficiently preliminarily processed.

  According to the wedge forming apparatus of the present invention, in forming the wedge provided in the slot of the stator core, when the wedge is inserted into the slot of the stator core, the leading end of the wedge comes into contact with the slot paper in the middle of the insertion and the insertion resistance Thus, it becomes possible to mold a wedge that can avoid the possibility of the buckling of the wedge due to the force during insertion. In addition, it is possible to form a wedge that can avoid the possibility that the leading edge of the wedge contacts the slot paper during the wedge insertion and the slot paper is torn.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the wedge forming apparatus according to the present invention will be described below in detail with reference to the drawings based on FIGS. A wedge forming apparatus 1 according to the present invention is shown in FIG. A cylindrical upper tool 4 is rotatably disposed on the base 3 of the wedge forming apparatus 1. The unit base 5 arranged so as to be in contact with the base 3 is provided with a jig unit 6 in such a form that it can slide in the left-right direction so as to be close to and away from the upper tool 4. The jig unit 6 includes a wedge paper roll 7, a roller unit 10 including a first roller 8 and a second roller 9, and a punching unit 12. The punch processing unit 12 includes a punch 11, a die 13, a punch guide 14, and a cutter unit 15. The tape-shaped wedge base paper 2 drawn out from the wedge paper roll 7 passes between the first roller 8 and the second roller 9, passes through the cutter unit 15, and is sent to the punching unit 12. The upper tool 4 includes a wedge guide (not shown), and a wedge to be driven after being bent by the punch 11 is held in the wedge guide.

  A front view of the roller unit 10 is shown in FIG. 2A, a bottom view is shown in FIG. 2B, and a partial front view of the wedge base paper 2 is shown in FIG. 2C. As shown in FIG. 2A, the first roller 8 and the second roller 9 have substantially the same outer diameter, and rotate so that the wedge base paper clamping surfaces 8a and 9a are in contact with each other so as to sandwich the wedge base paper 2. The axes are arranged in parallel. Further, as shown in FIG. 2B, the first roller 8 is formed with a protruding portion 20 having a constant base width W and a square cross-sectional shape over the entire circumference of the wedge base paper clamping surface 8a. ing. On the other hand, the second roller 9 is also formed with a concave portion 21 having a constant concave portion width W2 and a cross section engaging with the protruding portion 20 over the entire circumference of the wedge base paper clamping surface 9a. . The concave portion width W2 of the concave portion 21 is made slightly wider than the base portion width W of the protruding portion 20 so that there is room for the wedge base paper 2 to be sandwiched. As shown in FIG. 2C, the wedge base paper 2 is made of an insulating resin molding into a rectangular shape, has a wedge base paper width WW, and has a wedge base paper center line LW.

  A front view of the punched portion 12 is shown in FIG. 3 (A), and a plan view is shown in FIG. 2 (B). As shown in FIG. 3A, the punched portion 12 has a punched portion length L, and is arranged so that the die 13 and the punch guide 14 come into contact with each other. The die 13 and the punch guide 14 are provided with a die hole 24 and a punch guide hole 25 having a constant hole width W3. A punch guide groove 16 is provided on the contact surface of the punch guide 14 with the die 13 so as to hold the wedge base paper 2. A cutter unit 15 is provided on the upper surface of the punch guide 14 and the die 13. The cutter unit 15 has a wedge supply path 26 that passes between the blades and communicates with the punch guide groove 16. The wedge base paper 2 is sent from the upper part to the lower part of the punching part 12 by the roller part 10, penetrates the wedge supply path 26, and is stored and held in the punch guide groove 16. Further, as shown in FIG. 3 (B), in the vicinity of the punch guide hole 25 of the punch guide 14, the punch 11 is driven by a driving device (not shown) as shown by the arrow Y in FIG. It is arranged to be able to penetrate. The punch 11 has a base width W that is the same width as the base width W (FIG. 2) of the protrusion 20 included in the first roller 8. The hole width W3 of the die hole 24 and the punch guide hole 25 is slightly wider than the base width W of the punch 11 so that the punch 11 can pass through and push out the wedge base paper 2.

  The operation of the wedge forming apparatus of the present invention will be described. First, preliminary processing (processing for forming a crease at the bending position prior to bending forming in the punched portion) is performed. In FIG. 2, the wedge base paper 2 drawn out from the wedge paper roll 7 is first fed into the roller unit 10. The wedge base paper 2 is fed by a guide portion (not shown) so that the positions of the wedge base paper center line LW and the center lines LR of the wedge base paper clamping surfaces of the first roller 8 and the second roller 9 coincide. The fed wedge base paper 2 is sandwiched between the first roller 8 and the second roller 9 at the contact portion T. Then, when the first roller 8 rotates clockwise (in the direction of arrow R1) and the second roller 9 rotates counterclockwise (in the direction of arrow R2), the wedge base paper 2 is moved downward in FIG. 2 by the length corresponding to the rotation. Sent. Since the wedge base paper 2 is sandwiched between the protruding portion 20 having the base width W and the concave portion 21 having the concave portion width W2 at the contact portion T, the wedge base paper 2 is aligned with the surface shape of the protruding portion 20 by the concave portion 21. The crease is formed on the wedge base paper 2 by being pressed down. That is, the shape of the surface of the protrusion 20 is transferred to the wedge base paper 2.

  FIG. 4 shows a cross-sectional shape of the wedge base paper 2. Before the wedge base paper 2 passes through the contact portion T of the roller portion 10 (before preliminary processing), the cross section of the wedge base paper 2 is linear as shown in the cross-sectional view of FIG. Then, after passing through the contact portion T of the roller portion 10 (after preliminary processing), as shown in the cross-sectional view of FIG. 4B, the cross section of the wedge base paper 2 has a base width W that connects the rising portion 31 rising from both sides and the rising portion. The base portion 30 has a substantially trapezoidal cross section. The wedge base paper 2 is made of an insulating resin molded body and has an elastic recovery force. Therefore, even when bent at a substantially right angle at the contact portion T, the wedge base paper 2 is elastically recovered to some extent after passing through the contact portion T, and the rising angle ( An angle formed by the base 30 and the rising portion 31) θ1.

  The rising angle θ1 varies depending on parameters such as the material and thickness of the wedge base paper 2, the shape of the protruding portion 20, and the load applied when the wedge base paper 2 is held between the roller portions 10. Here, in FIG. 2, the rotation shaft 9 b of the second roller 9 is configured so as to be freely adjusted in proximity to and away from the first roller 8 by a screw mechanism (not shown). It is possible to adjust the inter-axis distance D between the two rollers 9 and the rotation shaft 9b. That is, if the inter-shaft distance D is adjusted so that the rotating shaft 9b is brought close to the rotating shaft 8b in a state where the first roller 8 and the second roller 9 are in contact with each other, the wedge paper 2 is added when the roller base 10 is sandwiched. The load that can be increased. In this way, it is possible to adjust the load applied to the wedge base paper 2 when the wedge base paper 2 is sandwiched. Accordingly, the rising angle θ1 can be changed by changing the inter-axis distance D. In addition, by selecting the optimum inter-axis distance D corresponding to the material, thickness, etc. of the wedge base paper 2, the wedge base paper 2 is cracked by forming a crease line more than necessary during preliminary processing. It is possible to prevent the above situation and to ensure a sufficient rising angle θ1 even with the wedge base paper 2 that is difficult to be formed.

  Then, the wedge base paper 2 sent out below the roller unit 10 is fed into the punching unit 12 shown in FIG. The wedge base paper 2 is fed so as to pass through the wedge supply path 26 at a guide portion (not shown) and to be inserted into the punch guide groove 16. When the wedge base paper 2 is inserted into the punch guide groove 16 up to the wedge length WL (WL is a length determined according to the height of the stator core), the rotation of the first and second rollers stops and the wedge base paper 2 Feeding is stopped. Next, the wedge base paper 2 is cut into a length WL by sliding the blade of the cutter unit 15 with a driving device (not shown). If the wedge length WL fed into the punch guide groove 16 is adjusted, a wedge having a wedge length WL corresponding to the height of various stator cores can be created with the punched portion length L as the maximum length. The wedge base paper 2 after being cut is held in the punch guide groove 16 by a holding member (not shown).

  Next, bending molding is performed. When the punch 11 is moved in the Y direction in FIG. 3 by a drive device (not shown), the front end surface 11 a of the punch 11 abuts the base 30 of the wedge base paper 2 through the punch guide hole 25. When the punch 11 is further moved in the Y direction after contact, the wedge base paper 2 is pressed by the inner wall surface of the die hole 24 so as to follow the surface shape of the front end surface 11a of the punch 11, and the bent portion of the wedge base paper 2 is bent. It is formed. That is, the shape of the front end surface 11 a of the punch 11 is transferred to the wedge base paper 2. Then, when the punch 11 is passed through the die hole 24 and protrudes from the die 13 (left side of the punched portion 12), the wedge base paper 2 also finishes passing through the die hole 24 and the bending forming process is finished, and the formed wedge 2a is finished. Is completed.

  FIG. 4 shows the cross-sectional shapes of the wedge base paper 2 and the wedge 2a after bending. The wedge base paper 2 (cross-sectional view in FIG. 4B) at the preliminary processing end stage has a substantially trapezoidal shape having a rising angle θ1 (an angle formed by the base portion 30 and the rising portion 31). The wedge 2a (cross-sectional view of FIG. 4C) has a substantially U-shape having a rising angle θ2 larger than the angle θ1.

  Then, the wedge 2a that has been bent and formed by the punch 11 protruding from the die 13 is driven by a punch 11 into a wedge guide in a wedge magazine (not shown) provided in the upper tool 4 (FIG. 1). When the wedge driving is completed once, the upper tool 4 is rotated by a predetermined angle while being controlled by a control unit (not shown) via a drive gear (not shown). Also, the first roller 8 and the second roller 9 of the roller unit 10 are rotated by a predetermined angle by the control unit, and the wedge base paper 2 is fed into the punch guide groove 16 until the wedge length WL, and preparation for punching of the next wedge is performed. Is completed. This operation is repeated until all the wedge magazines in the upper tool 4 are loaded with the molded wedge 2a.

  As described above, in the present embodiment, the protrusion 20 and the concave portion 21 of the roller portion 10 perform the preliminary processing for forming a crease at the bending position so that the rising portion 31 of the wedge base paper 2 has the rising angle θ1. A crease is formed. Next, a bending process is performed by the punched part 12, and it is bent and formed into a substantially U shape so as to have a larger rising angle θ2. Thereby, shaping | molding is fully performed at the time of the bending shaping | molding in a punch process part, and the shape | molded wedge 2a which has desired rise angle (theta) 2 can be obtained. Therefore, when the molded wedge 2a is inserted into the slot of the stator core, the rising edge 32 of the wedge 2a contacts the slot paper during the insertion, and the insertion resistance increases, and the wedge may be buckled by the force at the time of insertion. Can be avoided. Further, it is possible to avoid the possibility that the rising edge portion 32 of the wedge 2a contacts the slot paper during the wedge insertion and the slot paper is torn.

  In addition, it is possible to simultaneously perform preliminary processing for forming a crease at the bending position and feeding operation for feeding the wedge 2 to the punching portion 12 by the roller portion 10. Therefore, in order to perform preliminary processing, it is only necessary to change the first roller 8 and the second roller 9 of the existing roller section 10, and no new equipment for preliminary processing is required. Thus, the wedge can be sufficiently bent without fear of increasing the manufacturing cost.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention. The preliminary processing portion is configured to include a protruding portion 20 of the first roller 8 and a concave portion 21 that engages with the protruding portion 20 of the second roller 9, but on the wedge base paper sandwiching surface of at least one of the rollers. A protrusion corresponding to the bending position may be provided. An example is shown in the enlarged view of the contact part in the roller part bottom view of FIG. That is, the first roller 38 is provided with a pair of protrusions 40 having a substantially triangular cross-sectional shape over the entire circumference of the wedge base paper sandwiching surface 38a so that the width between the front ends thereof is the base width W. The wedge base paper clamping surface 39a of the second roller 39 may be flat. In this case, the wedge base paper 2 is sandwiched between the protrusion 40 and the flat wedge base paper clamping surface 39a, a crease is formed on the wedge base paper 2, and preliminary processing is performed.

  Further, the wedge base paper 2 is sandwiched between the contact portions T of the first roller 8 and the second roller 9, but the present invention is not limited to this form, and a single-sided roller may be used. For example, in the case where only the first roller 8 exists in FIG. 2 and the second roller 9 does not exist, the wedge base paper 2 may be sent downward while tension is applied in the left direction and the downward direction in FIG. The wedge base paper 2 is fed from the left side of FIG. 2 and is sent to the lower side of FIG. 2 while changing the feeding direction while being pressed against the protruding portion 20 of the first roller 8. At this time, the wedge base paper 2 is pressed along the surface shape of the protruding portion 20, and a crease is formed on the wedge base paper 2. Further, the shape of the roller used for the single-sided roller is not limited to the shape having the protruding portion 20 like the first roller 8, but is constant over the entire circumference of the wedge base paper clamping surface 9 a like the second roller 9. The roller in which the recessed part 21 which has the recessed part width W2 is formed may be sufficient. Alternatively, as in the first roller 38 (FIG. 5), a pair of protrusions 40 having a substantially triangular cross-sectional shape over the entire circumference of the wedge base paper clamping surface 38a, and the width between the tip portions of each pair is the base width. The roller provided so that it may become W may be sufficient.

The figure which shows the wedge shaping | molding apparatus concerning this invention Front view of roller part, bottom view and partial front view of wedge base paper Front view and plan view of punched part Diagram showing the cross-sectional shape of the wedge paper Enlarged view of roller contact area Diagram showing a wedge magazine in the prior art Partial sectional view of a wedge magazine in the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wedge shaping | molding apparatus 2 Wedge base paper 8 1st roller 9 2nd roller 8a, 9a Wedge base paper clamping surface 10 Roller part 11 Punch 12 Punch processing part 13 Die 14 Punch guide 20 Protruding part 21 Concave part 30 Base part 31 Standing part W Base part Width W2 Concave width D Distance between axes θ1, θ2 Rising angle

Claims (2)

A punched portion that bends both ends of the long side of the rectangular wedge and forms a substantially U shape;
A wedge forming apparatus including a roller portion that sandwiches a wedge base paper before forming and feeds it to the punching portion,
The roller unit may have a pre-processing unit to put a muscle folding bending position prior to the bending mold in the punching unit,
The roller portion includes a first roller and a second roller that sandwich the wedge base paper,
The preliminary processing portion includes a protruding portion provided at a central portion of the wedge base paper holding surface of the first roller and a concave shape provided at a central portion of the wedge base paper holding surface of the second roller and engaged with the protruding portion. With
The punching portion is disposed such that a die and a punch guide contact each other, and a die hole provided in the die and a punch guide hole provided in the punch guide are disposed adjacent to each other, and the die and the punch A punch guide groove is provided on a contact surface with the punch guide so as to be able to hold a pre-processed wedge base paper supplied from the roller portion, and the punch is located near the punch guide hole. And a wedge forming apparatus arranged to be able to pass through the die hole . The wedge forming apparatus according to claim 1 , wherein an inter-axis distance between a rotation shaft of the first roller and a rotation shaft of the second roller is adjustable.

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