JP2007330033A - Coil end cutting device and coil end cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cutting resistance and to suppress the occurrence of a shock in a coil end cutting device 1 that cuts coil ends 2 of an armature 3. <P>SOLUTION: The coil end cutting device 1 is provided with a blade tool 13 that contacts the coil ends 2 to perform the cutting action, a first drive means that makes the blade tool 13 approach the armature 3, and a second drive means that enables the blade tool 13 to cut the coil ends 2 by performing the rotational drive of the armature 3. The blade tool 13 is capable of performing the cutting action by contacting the coil end 2 continuously until the cutting of all the coil ends 2 is finished. Thereby, the blade tool 13, while cutting one coil end 2, capable of performing the cutting action by contacting an adjacent coil end 2. Thus, a cutting force given to the coil ends 2 when the blade tool 13 contacts the coil ends 2 can be lessened, so that the cutting resistance can be reduced and the occurrence of a shock can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coil end cutting device and a coil end cutting method for cutting a coil end protruding from a riser groove toward one end side in an axial direction by driving a commutator into an armature after coil winding.

  Conventionally, in an armature manufacturing process, in order to easily perform a work of driving a commutator into an armature after coil winding, a coil end is provided in an acute angle shape and protruded from a riser groove to one end side. For this reason, in order to ensure the sliding contact surface with the brush on the side surface of the commutator, it is necessary to cut and remove the portion of the coil end that protrudes from the riser groove.

  And the conventional coil end cutting device cut | disconnects a coil end by making a blade tool and a coil end contact | abut intermittently by making it approach while rotating an armature to the fixed blade tool. According to this conventional coil end cutting device, after cutting one coil end, the cutting tool once does not come into contact with the coil end, and again comes into contact with the adjacent coil end to exert a cutting action.

  Thus, since the conventional coil end cutting device repeats the separation and contact between the coil end and the cutting tool, the cutting resistance is large and the impact frequently occurs. For this reason, when it cut | disconnects by the conventional coil end cutting device, there exists a possibility that a commutator may rotate relatively with respect to a shaft, or a commutator may be damaged. Moreover, when a cutting | disconnection burr | flash tends to generate | occur | produce and a cutting | disconnection burr | flash is large, there exists a possibility that a short circuit may generate | occur | produce between adjacent segments. Moreover, since copper pieces and burrs are powdered and scattered or remain in the armature, it takes time to remove and clean them. Furthermore, there is a possibility that the life of the blade itself may be reduced.

In addition, when the coil end is entangled with the riser to configure the armature, the coil end cutting device has been improved in order to prevent the coil end from coming into contact with a segment different from the segment to be conducted and causing a short circuit. (See, for example, Patent Document 1). However, this technique is a countermeasure when the coil end is entangled with the riser to configure the armature, and is not a countermeasure when the armature is configured by protruding the coil end from the riser groove as described above.
JP 2001-211162 A

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to reduce cutting resistance and suppress the occurrence of impact in a coil end cutting device.

[Means of Claim 1]
The coil end cutting device according to claim 1 cuts the coil end protruding from the riser groove toward one end side in the axial direction by driving a commutator into the armature after coil winding. The coil end cutting device includes a cutting tool that abuts against the coil end and exerts a cutting action, first driving means that drives at least one of the cutting tool and the armature to bring the cutting tool and the coil end close to each other, and at least the cutting tool and the armature. Second driving means for driving one of the blades to cut the coil end. The cutting tool is set so as to be able to exert a cutting action by continuously contacting the coil ends until the cutting of all the coil ends is completed.

  As a result, the cutting tool completes the cutting of one coil end and simultaneously abuts on the adjacent coil end to exert a cutting action, or while cutting one coil end, Or a cutting action can be exerted. For this reason, since the contact force applied to the coil end when the blade is in contact with the coil end can be relaxed, the cutting resistance can be reduced and the occurrence of impact can be suppressed. In addition, since the cutting tool exerts a cutting action on the coil end by applying the above-described contact force to the coil end, this contact force is called a cutting force.

[Means of claim 2]
According to the coil end cutting device of the second aspect, the cutting tool is provided in a disk shape and has a blade surface continuous to the outer periphery.
Thereby, the cutting force which a cutting tool gives to each coil end can be made uniform. For this reason, it is possible to prevent the cutting tool from being unevenly worn.

[Means of claim 3]
According to the coil end cutting device of the third aspect, the first driving means feeds the cutting tool toward the axis of the armature.
Thereby, the component force of the circumferential direction can be minimized among the component force of cutting force. For this reason, it is possible to greatly reduce the possibility that the commutator rotates relative to the shaft among the problems caused by the large cutting resistance.

[Means of claim 4]
According to the coil end cutting device of the fourth aspect, the second driving means causes the cutting tool to cut the coil end by rotationally driving the armature, and the cutting tool rotates in synchronization with the armature.
As a result, the contact portion on the blade side and the outer periphery of the coil end rotate at substantially the same speed, so that the contact between the blade and the coil end is gently performed. For this reason, cutting resistance can be reduced significantly.

[Means of claim 5]
According to the coil end cutting device of the fifth aspect, the cutting tool is rotatable about a predetermined axis.
Thereby, if a blade tool and a coil end contact | abut, a blade tool will carry out dependent rotation synchronizing with an armature. For this reason, the rotation of the cutting tool and the rotation of the armature can be synchronized with a simple structure.

[Means of claim 6]
According to the coil end cutting device of the sixth aspect, the cutting tool is provided in a single-edged shape.
Thereby, since the coil end can be cut to the riser, a wider sliding contact surface with the brush can be secured. Moreover, since the component force of an axial direction can be made to act intensively toward one end side among cutting forces, a possibility that a coil may be pushed out to the other end side can be reduced.

[Means of Claim 7]
According to a seventh aspect of the present invention, the coil end projecting toward the one end side in the axial direction from the riser groove is cut with a predetermined cutting tool by driving a commutator into the armature after coil winding. According to this coil end cutting method, at least one of the cutting tool and the armature is driven to bring the cutting tool and the armature closer to each other, and at least one of the cutting tool and the armature is driven to cause the cutting tool to cut the coil end. Until the cutting of all the coil ends is completed, the cutting tool is continuously brought into contact with the coil end to continue the cutting action on the coil end.

  The coil end cutting device of the best mode 1 cuts the coil end protruding from the riser groove to one end side in the axial direction by driving a commutator into the armature after coil winding. The coil end cutting device includes a cutting tool that abuts against the coil end and exerts a cutting action, first driving means that drives the cutting tool to bring the cutting tool and the coil end close to each other, and an armature that drives the cutting tool. Second driving means for performing cutting. The cutting tool is set so as to be able to exert a cutting action by continuously contacting the coil ends until the cutting of all the coil ends is completed.

  Further, the cutting tool is provided in a disc shape, has a blade surface continuous to the outer periphery, and is provided in a single-edged shape. Further, the cutting tool is rotatable around a predetermined axis and rotates in synchronization with the armature. The first driving means feeds the cutting tool toward the axis of the armature, and the second driving means causes the cutting tool to cut the coil end by rotationally driving the armature.

[Configuration of Example 1]
The configuration of the coil end cutting device 1 according to the first embodiment will be described with reference to FIGS. 1 to 5.
First, the coil end 2 cut | disconnected by the coil end cutting device 1 is an edge part of the coil 4 wound by the armature 3, as shown in FIG.

  As shown in FIG. 1, the coil end 2 protrudes from the groove (riser groove) 8 of the riser 7 provided for each segment 6 constituting the commutator 5 to one end side in the axial direction. That is, in the manufacturing process of the armature 3, the coil end 2 protrudes from the riser groove 8 by winding the coil 4 around the shaft 9 in a multiple manner and driving the commutator 5 from one end side of the coil 4 after winding. The armature 3 constitutes a DC motor after the coil end 2 is cut, for example, by providing field poles on the outer peripheral side.

  The coil end cutting device 1 includes a cutting tool 13 that abuts on the coil end 2 to exert a cutting action, first driving means (not shown) that drives the cutting tool 13 to bring the cutting tool 13 close to the coil end 2, and an armature 3. 2nd drive means (not shown) which rotationally drives (refer Fig.2 (a)).

  As shown in FIGS. 3 and 4, the cutting tool 13 is provided in a disc shape, has a blade surface continuous to the outer periphery, and is provided in a single-edged shape. Further, the cutting tool 13 is rotatable about the rotation shaft 14.

  That is, the rotating shaft 14 is fastened and fixed to a predetermined holder 17 by the nut 16. A bearing 18 that forms a rotating bearing and a bearing case 19 that is press-fitted into the bearing 18 are disposed on the outer peripheral side of the rotating shaft 14, and the cutting tool 13 is fastened to the bearing case 19 by a bolt 20.

  As a result, the inner ring 21 of the bearing 18 is fixed together with the rotating shaft 14, and the outer ring 22 of the bearing 18 is rotatable together with the bearing case 19 and the cutting tool 13, so that the cutting tool 13 is rotatable about the rotating shaft 14. Become. It should be noted that a retaining member 23 is fastened to the opposite side of the rotating shaft 14 by a bolt 24 that prevents the rotatable portion such as the blade 13 from jumping out.

  The first driving means feeds the blade 13 toward the axis of the armature 3 by moving the holder 17 forward and backward. Further, the second driving means rotationally drives the holder 28 that holds the armature 3 to rotationally drive the armature 3 to cause the blade tool 13 to cut the coil end 2 (see FIG. 2A).

  That is, the armature 3 is rotated in advance by the second driving means, the blade tool 13 is fed toward the rotating armature 3, and the blade tool 13 is brought into contact with the armature 3. Thereby, the cutting tool 13 receives contact | abutting force from the armature 3, and starts rotation so that the outer periphery of the cutting tool 13 and the outer periphery of the coil end 2 become substantially the same speed (refer Fig.4 (a)). That is, the cutting tool 13 starts dependent rotation synchronized with the armature 3 and starts rotating in the direction opposite to that of the armature 3.

  The blade 13 gives a cutting force to the blade 13 as a reaction force of the contact force received from the armature 3. As shown in FIG. 5, this cutting force can be broken down into three component forces: a main component acting in the circumferential direction, a back component acting in the axial direction, and a feed component acting in the radial direction. . And cutting | disconnection advances mainly by the effect | action of feed component force. The main component acts in the direction opposite to the rotation direction of the armature 3 and forms part of the cutting resistance. Further, the back component force has a function of pushing the cut coil end 2 to one end side.

  As described above, the cutting tool 13 is fed and rotated toward the axis of the armature 3 even while one coil end 2 is being cut. Abutting and cutting of the adjacent coil end 2 is started. Thus, the cutting tool 13 is sent out toward the axial center of the armature 3 until the cutting of all the coil ends 2 is completed, and continuously contacts the coil end 2 to exert a cutting action.

[Effect of Example 1]
The coil end cutting device 1 according to the first embodiment includes a cutting tool 13 that comes into contact with the coil end 2 to exert a cutting action, a first driving unit that causes the cutting tool 13 to approach the armature 3, and the armature 3 to be rotated to drive the cutting tool 13. And a second driving means for cutting the coil end 2, and the cutting tool 13 can continuously contact the coil end 2 and exert a cutting action until all the coil ends 2 have been cut.
Thereby, the cutting tool 13 can contact the adjacent coil end 2 and exert a cutting action in the middle of cutting one coil end 2. For this reason, since the cutting force applied to the coil end 2 when the blade 13 abuts on the coil end 2 can be relaxed, the cutting resistance can be reduced and the occurrence of impact can be suppressed.

Moreover, the blade 13 is provided in disk shape, and has a blade surface which continues to outer periphery.
Thereby, the cutting force which the cutting tool 13 gives to each coil end 2 can be made uniform. For this reason, it is possible to prevent the blade 13 from being unevenly worn.

Further, the first drive means sends the cutting tool 13 toward the axis of the armature 3.
Thereby, the main component force can be minimized (see FIG. 5A). For this reason, it is possible to greatly reduce the possibility that the commutator 5 rotates relative to the shaft 9 among the problems caused by the large cutting resistance.

The blade 13 rotates in synchronization with the armature 3.
Thereby, since the outer periphery of the blade 13 and the outer periphery of the coil end 2 rotate at substantially the same speed, the contact between the blade 13 and the coil end 2 is performed gently. For this reason, cutting resistance can be reduced significantly.

Further, the cutting tool 13 is rotatable about the rotation shaft 14.
Thereby, if the blade 13 and the coil end 2 abut, the blade 13 rotates in synchronization with the armature 3. For this reason, the rotation of the blade 13 and the rotation of the armature 3 can be synchronized with a simple structure.

Moreover, the blade 13 is provided in the shape of a single blade.
Thereby, since the coil end 2 can be cut up to the riser 7, a wider sliding contact surface with a brush (not shown) can be secured (see FIG. 2B). Further, since the back force can be concentratedly applied toward the one end side, the possibility that the coil 4 is pushed out to the other end side can be reduced (see FIG. 5A).

[Modification]
According to the coil end cutting device 1 of the present embodiment, the cutting tool 13 has a blade surface that is provided in a disc shape and continues to the outer periphery, but is not limited to this form. For example, the blade 13 may be provided in an annular shape to form a blade surface that continues to the inner periphery, or may be provided in an elliptical plate shape, an elliptical ring shape, or the like to form a blade surface. Furthermore, the cutting tool 13 only needs to be set so that it can continuously abut against the coil end 2 until the cutting of all the coil ends 2 is finished. The blade surface may be formed in a shape, a straight line, or the like.

  Moreover, according to the coil end cutting device 1 of the present embodiment, the first driving means drives the blade 13 to approach the coil end 2, and the second driving means rotates the armature 3. However, it is not limited to this form. For example, the armature 3 may be driven by the first driving means, or both the armature 3 and the cutting tool 13 may be driven. Further, the blade 13 may be driven by the second drive means, or both the armature 3 and the blade 13 may be driven.

(A) is a side view of the armature, (b) is a rear view of the armature. (A) is explanatory drawing which shows a coil end cutting device, (b) is explanatory drawing which shows the principal part of a coil end cutting device. It is sectional drawing which shows a blade tool. (A) is explanatory drawing which shows the state at the time of contact | abutting with a cutting tool and a coil end, (b) is explanatory drawing which shows the state at the time of completion | finish of cutting of a coil end. (A) is explanatory drawing which shows sending component force and back component force in the component force of cutting force, (b) is explanatory drawing which shows main component force in the component force of cutting force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil end cutting device 2 Coil end 3 Armature 4 Coil 5 Commutator 8 Riser groove 13 Cutting tool 14 Rotating shaft (axis)

Claims (7)

In the coil end cutting device for cutting the coil end protruding from the riser groove toward the one end side in the axial direction by driving a commutator into the armature after coil winding,
A cutting tool that abuts against the coil end and exerts a cutting action;
First driving means for driving at least one of the cutting tool and the armature to bring the cutting tool and the coil end close to each other;
Second driving means for driving at least one of the cutting tool and the armature to cause the cutting tool to cut the coil end;
The coil end cutting device is characterized in that the cutting tool is set so as to continuously contact the coil end and exert a cutting action until the cutting of all the coil ends is completed. In the coil end cutting device according to claim 1,
The coil end cutting device according to claim 1, wherein the cutting tool is provided in a disk shape and has a continuous blade surface on the outer periphery. In the coil end cutting device according to claim 2,
The coil end cutting device characterized in that the first driving means feeds the cutting tool toward the axis of the armature. In the coil end cutting device according to claim 1,
The second driving means causes the cutting tool to cut the coil end by rotationally driving the armature,
The coil end cutting device according to claim 1, wherein the cutting tool rotates in synchronization with the armature. In the coil end cutting device according to claim 4,
The coil end cutting device according to claim 1, wherein the cutting tool is rotatable about a predetermined axis. In the coil end cutting device according to claim 1,
The coil end cutting device, wherein the cutting tool is provided in a single blade shape. In the coil end cutting method of cutting the coil end protruding from the riser groove toward the one end side in the axial direction by driving a commutator into the armature after coil winding, with a predetermined cutting tool,
Driving at least one of the cutting tool and the armature to bring the cutting tool and the armature closer together, driving at least one of the cutting tool and the armature to cause the cutting tool to cut the coil end;
A coil end cutting method, wherein the cutting tool is continuously brought into contact with the coil end to continuously exert a cutting action on the coil end until all the coil ends are cut.

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