JPH0530140B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for processing a commutator in a small motor, and in particular, to a cylindrical commutator member formed of a conductive metal, and a method for manufacturing a commutator member in the interior of the commutator member. A method for processing a commutator in a small motor, in which a molded commutator integrally formed with an insulating member made of synthetic resin is perforated in the longitudinal direction to form a plurality of commutator segments. A processing method that efficiently crushes and removes the burr generated by the above-mentioned groove processing (by crushing, the burr may be broken from the root and then crushed and removed). It is related to.

(Prior art and problems to be solved by the present invention) Conventionally, as a processing method for manufacturing a commutator in a small motor, a cylindrical commutator member made of conductive metal (for example, copper) and , forming an insulating tube integrally with the commutator member by molding a synthetic resin inside the commutator member, and then drilling grooves at a plurality of locations on the commutator member to form a plurality of commutator segments. method is known. In the so-called mold commutator manufactured by this processing method, the sliding surface that contacts the brush can be processed by rotary cutting using a lathe or the like (hereinafter referred to as outer diameter cutting).
It has the excellent feature that it is possible to obtain a sliding surface with high roundness.

However, in the mold commutator, as described above, the cylindrical commutator member is perforated in the longitudinal direction at a plurality of locations to form a plurality of commutator segments. As shown in FIG. 1A, which will be described later, burrs 4 are generated at the side corners of the commutator segment 1'. The burrs must be removed because the burrs make the contact with the brush unstable and cause undesired sparks and electrical noise. The occurrence of the above burrs can be determined by either performing the above-mentioned drilling process using the so-called atsupa-cut method, or
Depending on whether the undercut method is used, or whether it is carried out before or after the outer diameter cutting as described above, the cutter is protruded from the outside of the groove 3 as shown in Fig. 1A. There are two states: state A, which occurs inside the groove 3, and state B, which is not shown, which occurs inside the groove 3.
As a conventional burr removal method, the following method has been used in response to the above conditions A and B.

(i) A method of moving a wedge-shaped knife by pushing it into a groove. That is, this is a method of scraping off the burr with a wedge-shaped knife, and is applied to the above condition B.

(ii) A method applied in the case of condition A above, in which the burr is removed by scraping the burr using wrapping film, sand paper, etc.

However, the above burr removal methods (i) and (ii) have the following problems. That is, in the above method (i), it is difficult to automate and requires manual labor, resulting in poor productivity. Furthermore, when the above method (ii) is applied to the above-mentioned condition A, which occurs when the above-mentioned grooving is performed after the above-mentioned outer diameter cutting, and the grooving is performed by the so-called up-cut method, Since so-called kerf marks formed on the surface of the commutator segment are removed by the aforementioned outer diameter cutting, there is a problem in that the effective contact area between the brush and the commutator segment is reduced in some cases. .

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and therefore, a method for processing a commutator in a small motor according to the present invention includes a method for processing a commutator made of a conductive metal. a cylindrical commutator member;
A molded commutator integrally formed with an insulating member made of synthetic resin molded inside the commutator member, and grooved in the longitudinal direction to form a plurality of commutator segments. In a method for machining a commutator in a motor, a disc-shaped roller jig having shoulder-shaped recesses formed on the outer periphery of both sides and configured to be freely rotatable is used to perform the drilling process on the side corners of the commutator segment. While pressing the concave portion of the roller jig with a predetermined pressure against the burrs caused by the mold commutator, the disc-shaped roller jig The recess is configured to crush and remove the burr by relatively moving the burrs.

This will be explained below with reference to the drawings.

(Embodiment of the invention) Figures 1A and B are explanatory diagrams for explaining the basic principle of the processing method of the present invention, Figure 2 is a processing example of the invention, and Figure 2A is a side sectional view. , FIG. 2B is a sectional view taken along arrow A-A in FIG. 2A, and FIGS. 3A and 3B are illustrations of other processing embodiments of the present invention.

First, the basic principle of the processing method of the present invention will be explained with reference to FIGS. 1A and 1B. In addition, the code 1 in the figure is the commutator, and 1' is the commutator.
The segment 2 is an insulating tube formed by molding synthetic resin, 3 is a groove formed by the drilling process described at the beginning of this specification, 4 is a burr, and 5 is a segment. The roller jig is a rotatable disc-shaped one, and 5' is a jig recess formed in the shape of a shoulder on both sides of the outer periphery of the roller jig 5, and has a predetermined radius of curvature. 6 represents the commutator corner. In addition,
There are no cut teeth in the jig recess 5', and no cut teeth are provided at the peripheral end of the disc body of the roller jig 5.

The processing method of the present invention, as shown in FIG. 2A, rotates the roller jig 5 in the direction of the arrow in the figure and moves the commutator 1 in the direction of the arrow in the figure, thereby forming the jig recess 5', Burr 5' 4,
By contacting 4 with a predetermined pressure, the burr 4,
4 is crushed so to speak, thereby removing burrs. Incidentally, the burrs 4, 4 are generated entirely along the groove 3 which is formed by drilling in a pre-process of the present invention (not shown). Therefore, in the present invention, as described later in connection with FIG.
is rotatably supported, the commutator is moved in the drilling direction of the groove 3 (in the plane of the drawing in FIG. The burrs 4, 4 generated along the groove 3 are removed by moving the burrs 4, 4 in the vertical direction
is completely crushed and removed.

FIG. 1B is a diagram showing a state in which burrs have been removed based on the processing method of the present invention. That is, as a result of the burr removal, the commutator corners 6, 6 along the groove 3 are formed into a rounded shape corresponding to the radius of curvature R of the jig recesses 5', 5'. Note that the burr 4 shown in FIG. 1A is
This corresponds to the burr occurrence state A explained at the beginning of this specification, but in the case of burr occurrence state B explained at the beginning of this specification, that is, the burrs protrude inside the groove 3 in the width direction of the groove 3. It goes without saying that the jig recesses 5', 5' can crush any burrs that have occurred, and the processing method of the present invention can be applied thereto.

Next, an embodiment of burr removal based on the processing method of the present invention will be described with reference to FIGS. 2A and 2B. Reference numerals 1, 2, 3 and 5 in the figure correspond to those in FIG. 1, 7 is a burr removal device, 8 is a main body of the device,
9 is a roller shaft that supports the roller jig 5; 10 is a roller support portion that rotatably supports the roller shaft 9 and is configured to be slidable within the device main body 8; 11 is a spring that presses the roller support portion, and 12a and 12b are positioning members. The positioning members 12a and 12b are fixed to the apparatus main body 8, and the tips of the positioners 12a and 12b (unshaded portions in the figure) are located on the same line as the tip of the roller jig 5. , is formed to be slidable within the groove 3. Note that the positioning members 12a and 1
2b is the roller support part 10 as shown in FIG. 2A.
The width of the tips of the positioning members 12a and 12b (the size in the direction perpendicular to the plane of the paper shown in FIG. 2A) is preferably within the width of the groove 3 (actually, (with some play) has a value that engages. Further, 13 represents an insertion pin which is driven by a driving device such as an air cylinder. Although not shown, it goes without saying that the roller jig 5 is formed with a jig recess 5' as shown in FIG. 1A.

Although not shown in FIGS. 2A and 2B, the burr removing device 7 is arranged at an angle of 120° to each other so as to correspond to the three grooves of the commutator 1.
There are three pieces arranged at an angle of
After positioning the burr removing device 7 so that the tip of each positioning member 12a in each burr removing device 7 is located in the groove 3, the insertion pin 13 is positioned.
is lowered in the direction of arrow a in the figure by a drive device (not shown). By lowering the insertion pin 13, the insertion pin 13 is inserted into the shaft hole provided in the center of the commutator 1, and the stepped portion of the insertion pin 13 pushes the end surface of the commutator 1, and the commutator 1 The tip of the positioning member 12a slides into the groove 3 and descends in the direction of the arrow b shown in the figure. When the commutator 1 reaches a predetermined position, the jig recesses 5', 5' formed on the outer circumference of the roller jig 5 remove the burrs 4, 4 as described with reference to FIG. 1A. The pressure contact state is reached, and the burr removal described with reference to FIG. 1 is performed. Note that the pressing force exerted by the jigs 5', 5' on the burrs 4, 4 presses the roller support part 10 which rotatably supports the roller shaft 9 which pivotally supports the roller jig 5. This is caused by the elastic force of the spring 11.

The lowering of the commutator 1 in the direction of the arrow b in the figure continues while the jig recesses 5', 5' keep pressing the burrs 4, 4. Therefore, as the commutator 1 descends, the roller jig 5
rotates, and the jig recesses 5', 5' are always in pressure contact with the burrs 4, 4, so that the burr removal described above is performed continuously.

An embodiment of burr removal performed based on the basic principle of the processing method of the present invention explained with reference to FIG. 1 has been described above, and in FIG. Although the roller support part 10 is pressed, other elastic bodies (for example, rubber, etc.) may be used in place of the spring 11, or a drive means such as an air cylinder may be used to press the roller support part 10. 10 may be pressed with a predetermined pressure.

FIG. 3 is an explanatory diagram for explaining another working example of the present invention, and the reference numerals in the figure correspond to those in FIG. 1.

The embodiment shown in FIG. 3 is basically the same as the processing method explained in connection with FIGS. 1 and 2, but the jig recess of the roller jig 5 used in the embodiment shown in FIG. 5' is also formed with a right-angled step, as shown in FIG. 3A. Therefore, by performing the deburring process using the roller jig 5 shown in FIG. 3A, the commutator corner is formed into the jig recess 5' as shown in FIG. 3B. The shape corresponds to . As is clear from FIG. 3, in the embodiment shown in FIG. 3, since the roller jig 5 contacts only the portion where the burr 4 protrudes, it is possible to reduce the pressing force of the roller jig 5. This is an efficient processing method which is characterized in that the amount of deformation of the commutator segment 1' to remove the burr 4 is small.

(Effects of the Invention) As explained above, according to the present invention, it is possible to remove burrs generated on a mold commutator by drilling a mold commutator to form a plurality of commutator segments. Not only can processing be carried out efficiently, but the burr removal process does not require consumables such as sandpaper, unlike conventional methods, making it possible to perform the burr removal process at a low cost. . Furthermore, burrs can be removed without damaging the "grips" on the surface of the commutator segment, which are important for increasing the effective contact area during contact with the brush. Furthermore, the burr removal process does not impair the roundness of the outer peripheral surface of the commutator segment.

[Brief explanation of drawings]

Figures 1A and B are explanatory diagrams for explaining the basic principle of the processing method of the present invention, Figure 2 is a processing example of the invention, Figure 2A is a side sectional view, and Figure 2B is a FIG. 2A is a sectional view taken along arrow A-A in the drawing, and FIGS. 3A and 3B are illustrations of other processing embodiments of the present invention. In the figure, 1 is the commutator, 1' is the commutator segment, 2 is the insulating tube, 3 is the groove, 4 is the burr, 5 is the roller jig, 5' is the jig recess, 6 is the commutator corner, and 7 is the burr removal. In the apparatus, 8 is the main body of the apparatus, 9 is a roller shaft, 10 is a roller support part, 11 is a spring, 12a and 12b are positioning members, and 13 is an insertion pin.

Claims (1)

[Scope of Claims] 1. A molded commutator in which a cylindrical commutator member made of conductive metal and an insulating member made of synthetic resin molded inside the commutator member are integrally formed. hand,
In a method of machining a commutator for a small motor in which a plurality of commutator segments are formed by drilling in the longitudinal direction, a disk-shaped commutator segment is formed with shoulder-shaped recesses on the outer periphery of both sides and is configured to be freely rotatable. Using a roller jig, press the concave part of the roller jig with a predetermined pressure against the burr that has been formed on the side corner of the commutator segment by the drilling process, and press the mold.・By relatively moving the disc-shaped roller jig along the grooves drilled in the commutator, the concave portion crushes and removes the burr. Processing method of commutator in small motor.