JP2004216434A - Manufacturing method of metal bar for commutator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a metal bar for a commutator which can efficiently manufacture the metal bar having a projected part with a bulged tip and facilitates smooth release of the metal bar from a grooved roll. <P>SOLUTION: The projected part 16 with a recessed portion 17 on the top is formed on the metal bar 15 by employing the grooved roll 11 having a protrusion 13 on the bottom of the groove 12, whose width w becomes narrower toward the bottom of the groove 12. Then. the top of the projected part 16 is crushed by the roll 18 so that the side portion 20 of the top of the projected part 16 is extruded outward. In this way the metal bar for the commutator having the projected part 16 with the bulged portion 21 on the top is manufactured. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a metal strip for a commutator, and in particular, it is possible to efficiently manufacture a metal strip having a protrusion with a bulged tip, and to smoothly separate a metal strip from a grooved roll. The present invention relates to a method for manufacturing a commutator metal strip that can be performed.
[0002]
[Prior art]
Conventionally, a commutator in which a plurality of commutator pieces are arranged in an arc shape and integrated with a resin mold has been frequently used (for example, see Patent Document 1).
[0003]
FIG. 2 shows a manufacturing procedure of this type of commutator. First, a metal strip 2 of (a) in which a plurality of protrusions 1 are formed at equal intervals is prepared, and then this is replaced by (b) ), The resin 3 is molded inside by being curved in an arc shape, and finally, a slit 5 is formed in the thin portion 4 of the metal strip 2 to form the commutator pieces 1a, 1b,. Manufactured by being independent.
[0004]
FIG. 3 shows a method of manufacturing the metal strip 2, and FIG. 3 (a) shows an outline of the manufacturing apparatus.
By passing a metal raw material 9 thicker than the mutual gap of these rolls between a grooved roll 7 having a plurality of groove portions 6 formed at equal intervals and a flat roll 8, and deforming the raw material 9 (b) As described above, a metal strip 2 having a projection 1 corresponding to the shape of the groove 6 is manufactured, and this method is characterized by having high efficiency workability peculiar to roll processing.
[0005]
In the above-mentioned resin-molded commutator, the bonding force between the resin 3 and each of the commutator pieces 1a, 1b. For this reason, conventionally, various measures have been taken to increase the bonding strength between the two, in particular, the tip of the projection 1 is swelled, thereby providing an anchoring effect with the resin 3. The configuration is known as the most reliable and effective.
[0006]
[Patent Document 1]
Patent No. 2904623 [0007]
[Problems to be solved by the invention]
However, according to the conventional commutator in which the protrusion has an anchor effect, the shape of the protrusion protruding at the tip is an irregular shape, so that the production of the metal strip becomes complicated, and the production efficiency is reduced. Therefore, there is a problem that the cost of the commutator is increased.
[0008]
That is, since the formation of the bulging portion at the tip of the projection makes it more difficult to separate the metal strip 2 from the grooved roll 7 which is originally liable to cause trouble, the roll processing cannot be applied as it is. Therefore, another processing that is disadvantageously required must be efficiently performed.
[0009]
Therefore, an object of the present invention is to provide a method for manufacturing a metal strip for a commutator, which can efficiently manufacture a metal strip having a protruding projection with a bulged tip.
Another object of the present invention is to provide a method of manufacturing a commutator metal strip that can smoothly separate a metal strip having a projection from a grooved roll.
[0010]
[Means for Solving the Problems]
The present invention provides a method for manufacturing a metal strip for a commutator in which a protrusion is formed on a metal strip by a grooved roll having a groove formed in a circumferential direction, in order to achieve the above object.
A first part in which the metal strip forms a projection with a concave top part by using a roll having a convex portion at the bottom of the groove as the grooved roll and reducing the width of the groove toward the bottom side. After applying the processing of
A method for manufacturing a metal strip for a commutator, wherein a second process is performed in which a crushing force is applied from the top of the formed projection to project the tip side of the projection outward. Things.
[0011]
In the present invention, the convex portion formed at the bottom of the groove portion of the grooved roll may be formed continuously in the roll circumferential direction or may be formed intermittently in the same direction. And the structure of the commutator to which the metal strip is applied.
[0012]
The shape of the protrusion formed at the bottom of the groove is determined by the shape of the top of the protrusion formed on the metal strip, and examples of the shape of the top recess include, for example, a U-shaped cross section, a V-shaped cross section, and a W-shaped cross section. And the like. The width of the groove may be reduced toward the bottom, either continuously or stepwise.
[0013]
In the present invention, the second processing is preferably performed using a roll for efficiency. In this case, the first and second processing are arranged in tandem to be continuous, thereby obtaining high working efficiency. Is more preferable.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a method for manufacturing a metal strip for a commutator according to the present invention will be described.
FIG. 1A shows the relationship between the grooved roll and the metal strip in the first processing. The grooved roll 11 has a plurality of groove portions 12 whose width dimension w is gradually narrowed toward the bottom. The grooves 13 are formed at equal intervals, and the protrusions 13 are formed continuously at the bottom of each groove 12 in the roll circumferential direction.
[0015]
On the surface of the metal strip 15 processed from the metal raw material by the pressure between the grooved roll 11 and the flat roll 14, projections 16 are formed by transfer of the grooves 12. A V-shaped concave portion 17 is formed by transferring the convex portion 13.
[0016]
FIGS. 1B and 1C partially show the second processing, and the metal strip 15 processed in FIG. 1A is placed between the rolls 18 and 19 as shown in FIG. Then, as shown in FIG. 1 (c), the top of the protrusion 16 is crushed to cause the tip side portion 20 to protrude outward, whereby the tip as shown in FIG. It is processed into a metal strip 15 having a projection 16 as a bulging portion 21.
[0017]
According to this embodiment performed as described above, the first processing is based on the roll processing, and the second processing is also performed by the simple processing of only the top crushing. Therefore, it is possible to effectively solve the problem of the increase in cost due to the bulging of the protruding tip which occurred in the conventional manufacturing method.
[0018]
And in this manufacturing method, since the width dimension w of the groove 12 of the grooved roll 11 is narrowed toward the bottom, separation of the metal strip 15 after forming the protrusion 16 by the roll 11 is performed without resistance. As a result, the forming operation of the protrusion 16 can be performed smoothly.
[0019]
The separability of the metal strip 15 from the roll 11 is an important control point in this type of metal working. Therefore, the good separability as described above means that high quality and low trouble That results in a favorable result.
[0020]
When the processing shown in FIGS. 1B and 1C is performed on the metal strip 2 on which the projection 1 is formed by the method shown in FIG. 3, the projection 1 is deformed unevenly, and the entire strip is formed. Warpage and twisting occurred, and a good metal strip could not be obtained. This fact clearly shows the importance of the formation of the top concave projection in the present invention and the effect of crushing based on the importance.
[0021]
【The invention's effect】
As described above, according to the method for manufacturing a metal strip for a commutator according to the present invention, a metal is formed by using a grooved roll having a convex portion at the bottom of the groove and narrowing the width of the groove toward the bottom. The first processing is performed to form a top concave projection on the strip, and then the second processing is performed by applying a crushing force to the top of the projection to project the tip side of the projection outward. Since the metal strip has the above-mentioned shape, the metal strip having the protruding protruding portion can be efficiently manufactured, and the metal strip can be smoothly separated from the grooved roll.
[0022]
And, as a result of the work being performed efficiently and smoothly in this way, it is possible to provide a deformed metal strip suitable for a resin mold commutator at a low cost, and it is possible to provide a protruding tip in the conventional manufacturing method. It is possible to effectively solve the problem of an increase in cost due to the bulging.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a method for manufacturing a commutator metal strip according to the present invention, and (a) to (d) show the procedure.
FIGS. 2A to 2C are explanatory diagrams showing a method for manufacturing a resin mold commutator, and FIGS.
3A and 3B are explanatory diagrams showing a conventional method for manufacturing a metal strip for a commutator, wherein FIG. 3A shows an outline of a manufacturing apparatus, and FIG. 3B shows a configuration of a metal strip separated from a grooved roll.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Grooved roll 12 Groove part 13 Convex part 14 Flat roll 15 Metal strip 16 Projection part 17 Concave part 18, 19 Roll 20 Tip side part 21 Swelling part

Claims (4)

In a method for manufacturing a commutator metal strip for forming a protrusion on a metal strip by a grooved roll having a groove formed in a circumferential direction,
A first having a convex portion at the bottom of the groove portion as the grooved roll, and forming a projection with a concave top at the metal strip by using a roll in which the width of the groove portion is reduced toward the bottom portion. After processing,
A method for manufacturing a metal strip for a commutator, wherein a second process is performed in which a crushing force is applied from a top of the formed projection to project a tip side of the projection outward. 2. The metal strip for a commutator according to claim 1, wherein the first processing is performed by using the grooved roll in which the convex portion is formed continuously in a roll circumferential direction. 3. Manufacturing method. The metal strip for a commutator according to claim 1, wherein the first processing is performed by using the grooved roller in which the convex portion is formed intermittently in a roll circumferential direction. Manufacturing method. The method for manufacturing a metal strip for a commutator according to claim 1, wherein the second processing is performed by roll processing.

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