JP3174696B2 - Drum-shaped part processing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for grinding a central part of a cylindrical material into a drum-shaped part, and more particularly to a method and apparatus for processing a material having a groove on an outer periphery into a drum-shaped part. The present invention relates to a drum-shaped component processing method and apparatus suitable for processing.

[0002]

2. Description of the Related Art For example, a ferrite core used as a core of a coil, a transformer or the like has a core c having a narrow center as shown in the right side of FIG. This is a drum-shaped part a which is thicker than this.
A coil is wound around the core c of the drum-shaped component a to form a coil and a transformer.

[0003] Such a ferrite core has both ends b and b for leading out a lead wire of a coil wound around a core c.
Is provided with a groove d on the outer periphery. The drum-shaped component a having such a shape is manufactured by grinding a central portion of a cylindrical material a 'having a groove d' on a peripheral surface as shown on the left side of FIG.

FIG. 8 shows an example of an apparatus for grinding such a material a 'to produce a drum-shaped part a. The grinding peripheral surface 2 of the grinding wheel 1 rotating in the direction shown by the arrow and the guide peripheral surface 5 of the cam roller 4 rotating in the direction shown by the arrow are arranged to face each other, and the lower part of the gap between the peripheral surfaces 2 and 5 is arranged. Blade plate 7
Is arranged. Further, a pin-shaped core guide 3 is arranged on the side between the grinding peripheral surface 2 of the grinding wheel 1 and the guide peripheral surface 5 of the cam roller 4.

[0005] A material a 'as shown in FIG.
As shown in the figure, it is supplied between the grinding peripheral surface 2 of the opposing grinding wheel 1 and the guide peripheral surface 5 of the cam roller 4 and is rotatably supported at the upper end of the obliquely formed blade plate 7. The tip of the core guide 3 hits the end face of the material a ', and its axial position with respect to the grinding wheel 1 is regulated.

[0006] The grinding wheel 1 has a grinding portion formed of diamond powder or the like on the outer peripheral portion thereof, and the raw material a 'can be cylindrically ground by the grinding peripheral surface 2 which is the outer peripheral surface. The guide peripheral surface 5 of the cam roller 4 is shown in FIG.
8A, the distance from the center of rotation increases in the counterclockwise direction from the 3 o'clock position, and the distance becomes maximum at the 1 o'clock position in FIG. 8A. Therefore, when the cam roller 4 rotates in the direction indicated by the arrow as shown in FIG. 8 (a) to FIG. 8 (b), the guide peripheral surface 5 of the cam roller 4
Thus, the peripheral surface of the raw material a ′ is pressed against the grinding peripheral surface 2 of the grinding wheel 1 and is ground. During this time, since the material a 'is rotating, the central part of the peripheral surface thereof is cylindrically ground by the grinding wheel 1 to process the drum-shaped part a as shown in FIG.
The cutting depth of the grinding wheel 1 with respect to the material a 'is determined by the minimum distance between the grinding peripheral surface 2 of the grinding wheel 1 and the guide peripheral surface 5 of the cam roller 4.

[0007]

However, when a material a 'as shown in FIG. 9, that is, a material a' having a groove d 'on its peripheral surface, is processed by the above-mentioned conventional method and apparatus for processing a drum-shaped part, As shown in FIG. 7 (b), it was found that the cross section of the core portion c of the drum-shaped component a did not become a perfect circle, and the positions corresponding to the grooves d at both end portions b were raised as if protruding.

The inventors of the present invention have studied the cause and found the following facts. This is shown in FIG.
As shown in (a), when a groove d on the outer periphery of both ends b hits the guide peripheral surface 5 of the cam roller 4, the groove d causes the drum-shaped component a to slightly escape to the cam roller 4 side.
This is because the part a is separated from the grinding peripheral surface 2 of the grinding wheel 1. In view of the above-described problems of the conventional method and apparatus for processing a drum-shaped component, an object of the present invention is to provide a method and an apparatus for processing a drum-shaped component in which a core of the drum-shaped component can be processed into a substantially perfect circle. .

[0009]

In order to achieve the above object, in the present invention, when grinding the material a 'with the grinding wheel 11, it is attempted to grind the material a' with the guide peripheral surface 15 of the cam roller 14. Only the central portion of the peripheral surface to be pressed is pressed against the grinding peripheral surface 12 of the grinding wheel 11, whereby the core portion c of the drum-shaped component a is pressed.
It was decided to carry out cylindrical grinding on the basis of.

That is, in the method of processing a drum-shaped part according to the present invention, a cylindrical material a 'having a groove d' on its peripheral surface is formed by grinding a cylindrical peripheral surface 12 of a rotating disk-shaped grinding wheel 11 and a cam roller 14. The cam roller 14 is sandwiched between the guide peripheral surface 15 and the cam roller 14.
When the peripheral surface of the material a ′ is pressed against the grinding peripheral surface 12 of the grinding wheel 11 by the guide peripheral surface 15 of FIG. in the circumferential surface 15, and wherein the pressing only the peripheral surface central portion of the material a 'to be ground into the grinding peripheral surface 12 of the grinding wheel 11.

Further, the apparatus for processing a drum-shaped component according to the present invention comprises: a rotating disk-shaped grinding wheel 11 for grinding a central portion of a peripheral surface of a cylindrical material a 'having a groove on the peripheral surface; And a guide roller 15 for pressing the peripheral surface of the material a ′ against the grinding peripheral surface 12 of the grinding wheel 11 with the guide peripheral surface 15 disposed opposite to the grinding peripheral surface 12 of the grinding wheel 11.
And a guide means disposed between the grinding peripheral surface 12 of the grinding wheel 11 and the guide peripheral surface 15 of the cam roller 14 to guide the material a ′, and the width of the guide peripheral surface 15 of the cam roller 14 is reduced. , Grinding surface 1 of grinding wheel 11 facing it
2 or less.

[0012]

In the method and apparatus for processing a drum-shaped part according to the present invention, the cylindrical material a 'having a groove on the peripheral surface is formed by grinding the cylindrical peripheral surface 12 of the rotating disk-shaped grinding wheel 11 and the cam roller 1.
4, the peripheral surface of the material a ′ is interposed between the guide peripheral surface 15 of the cam roller 14 and the peripheral surface 1 of the grinding wheel 11.
2 to the pushing and cylindrical grinding, 'in case of processing into a drum shape, in guiding the peripheral surface 15 of the cam roller 14, the material a to be ground' material a grinding wheel 11 only in the peripheral surface central portion of the
Is pressed against the grinding peripheral surface 12. For this reason, even if the groove d remains at both ends b of the drum-shaped component a to be processed, the processing can be performed without being affected by the groove d at all. That is, since only the core c of the drum-shaped component a ground by the grinding wheel 11 is pressed against the grinding peripheral surface 12 of the grinding wheel 11 by the guide peripheral surface 15 of the cam roller 14, the groove d is guided by the cam roller 14. It does not hit the peripheral surface 15. For this reason, the drum-shaped part a
No protruding bulge is formed on the peripheral surface of the core portion c, and the concentric portion c can be processed into a substantially perfect circle.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 5 show a drum-shaped component processing apparatus according to an embodiment of the present invention. This device has a grinding wheel 11 and a cam roller 14.

The grinding wheel 11 is of a disk shape, its outer peripheral portion is made of a diamond wheel or the like, and its peripheral surface is a grinding peripheral surface 12 for grinding the peripheral surface of the material a '. The width of the grinding peripheral surface 12 is smaller than the entire length of the drum-shaped component a to be processed, and corresponds to the length of the core c. This grinding wheel 11 is driven by a motor (not shown).
It is rotated at a high speed in the direction shown by the arrow around the center shown by the dashed dotted line in FIGS.

The cam roller 14 has a guide peripheral surface 15 facing the grinding peripheral surface 12 of the grinding wheel 11. FIG.
In the embodiment shown in FIGS. 5 to 5, the cam roller 14 has step portions 16 on both sides of the peripheral surface, and the width of the guide peripheral surface 15 is smaller than the entire width of the cam roller 14. The width of the guide peripheral surface 15 is the same as the width of the grinding peripheral surface 12 of the grinding wheel 11, that is, the same as the width of the core c of the drum-shaped component a to be processed. The width of the guide peripheral surface 15 of the cam roller 14 may be smaller than the grinding peripheral surface 12 of the grinding wheel 11,
If the diameter is too small, the drum-shaped part a during grinding becomes unstable. Therefore, it is preferable that the diameter of the drum-shaped part a be the same as that of the grinding surface 12 of the grinding wheel 11 if possible.

The distance from the center of rotation of the cam roller 14 to the guide peripheral surface 15 indicated by the dashed dotted line in FIGS. 1 and 3 is minimized at a position near 2:30 in FIG. From the position, it gradually increases as it goes around the center in the counter-hour hand direction, and reaches a maximum at around 1 o'clock in FIG. Therefore, the distance from the guide peripheral surface 15 of the cam roller 14 to the grinding peripheral surface 12 of the grinding wheel 11 becomes maximum around 2:30 in FIG. 3A, and the distance is the diameter of the material a ′ to be processed. That is, the diameter is substantially the same as the diameter of both ends b of the drum-shaped part a which is not ground. Further, the grinding wheel 11 is moved from the guide peripheral surface 15 of the cam roller 14.
3 (a) becomes minimum at around 1 o'clock in FIG. 3 (a), and the distance is almost the same as the diameter of the core b of the drum-shaped component a to be machined. A cut-out portion 18 is formed between the cam roller 14 at around 2:30 and 1 o'clock in FIG. 5A, the distance from the center of rotation being sharply reduced. The cam roller 14 is rotated at a predetermined speed by a motor (not shown) around a center indicated by a dashed line in FIGS. 1 and 3 in a direction indicated by an arrow.

The upper end of the blade plate 17 is disposed slightly below the position where the grinding peripheral surface 12 of the grinding wheel 11 and the guide peripheral surface 15 of the cam roller 14 face each other. The upper end of the blade plate 17 is slanted, and its slope faces the guide peripheral surface of the cam roller 14. Further, a pin-shaped core guide 1 is provided on a side of a position where the grinding peripheral surface 12 of the grinding wheel 11 and the guide peripheral surface 15 of the cam roller 14 face each other.
3 are arranged. The distance between the end surface of the core guide 13 and the edge of the grinding peripheral surface 12 of the grinding wheel 11 corresponds to the width of both ends b of the drum-shaped component a to be processed.

When processing a drum-shaped part a using such a drum-shaped part processing apparatus, as shown in FIGS. 1, 2 (a), 3 (a) and 4 (a), a grinding wheel A cylindrical material a ′ is supplied between the grinding peripheral surface 11 of 11 and the guide peripheral surface 15 of the cam roller 14, and is supported at the upper end of the blade plate 17. At this time, the core guide 13 hits the end face of the material a 'and regulates its position in the center axis direction.

In this state, the grinding wheel 11 is moved to the position shown in FIG.
While rotating at a high speed in the direction of the arrow, the cam roller 14 is rotated in the direction of the arrow from the position shown in FIGS. 3 (a) and 4 (a). As a result, the guide peripheral surface 15 of the cam roller 14 approaches the grinding peripheral surface 12 of the grinding wheel 11, and FIG.
As shown in (a) to (b) in the figure, the central part of the peripheral surface of the raw material a ′ is cut in the radial direction while being ground by the grinding peripheral surface 12 of the grinding wheel 11. The cutting of the grinding wheel 11 into the material a ′ is performed by the cam roller 14 as shown in FIGS.
The maximum is obtained when rotating to the position shown in FIG. As a result, the central part of the peripheral surface of the material a ′ is aligned with FIG.
As shown in (1), it is ground to a predetermined diameter and processed as a drum-shaped part a.

Subsequently, when the cam roller 14 is further rotated in the direction of the arrow from the position shown in FIGS. 3B and 4B, the processed drum-shaped part a enters the notch 18 and a is temporarily free. For this reason, the processed drum-shaped component a is dropped downward along the inclination of the upper end of the blade plate 17, and the ground surface 12 of the grinding wheel 11 is grounded.
And between the guide peripheral surface 15 of the cam roller 14. Subsequently, the next material a ′ is the grinding peripheral surface 12 of the grinding wheel 11.
And between the guide peripheral surface 15 of the cam roller 14 and
In the same manner, the outer peripheral center of the material a 'is cylindrically ground,
The drum part a is processed.

In the drum-shaped component processing method and apparatus according to this embodiment, only the central portion of the peripheral surface of the material a ′ to be ground is pressed against the grinding peripheral surface 12 of the grinding wheel 11 by the guide peripheral surface 15 of the cam roller 14. Therefore, as shown in FIG.
Even if there are grooves d at both ends b of the drum-shaped part a to be processed, the grooves d do not hit the guide peripheral surface 15 of the cam roller 14. For this reason, the entire circumference of the core c of the drum-shaped part a can be cylindrically ground in a fixed state, and the peripheral surface of the core c does not have a raised bulge. Can be processed.

Next, the embodiment shown in FIG. 6 will be described.
The width of the guide peripheral surface 15 of the cam roller 14 was smaller than the entire width of the cam roller 14. On the contrary,
In the embodiment shown in FIG. 6, the entire cam roller 14 has substantially the same width as the grinding peripheral surface 12 of the grinding wheel 11, and therefore, the width of the guide peripheral surface 15 of the cam roller 14 is
It has substantially the same width as one of the grinding peripheral surfaces 12. In this case, too, only the central portion of the material a ′ to be ground by the grinding wheel 11 can be pressed against the grinding peripheral surface 12 of the grinding wheel 11 to make a cut, so that it is not affected by the grooves at both ends.
The core of the drum-shaped part a can be processed into a substantially perfect circle.

[0023]

As described above, according to the present invention, even when grooves d are formed at both ends b of a drum-shaped part a to be processed, the drum-shaped part a is cam roller 1 at the groove d.
Since it does not escape to the side 4, a raised bulge cannot be formed on the peripheral surface of the core portion c of the drum-shaped component a, and the concentric portion c can be processed into a substantially perfect circle.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a drum-shaped component processing apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the drum-shaped component processing apparatus according to the embodiment.

FIG. 3 is a schematic side view of the drum-shaped component processing apparatus according to the embodiment.

FIG. 4 is an enlarged schematic side view of a main part of the drum-shaped component processing apparatus according to the embodiment.

FIG. 5 is a schematic enlarged perspective view of the drum-shaped component processing apparatus according to the embodiment.

FIG. 6 is a longitudinal sectional plan view of a main part of a drum-shaped component processing apparatus according to another embodiment of the present invention.

FIG. 7 is an enlarged schematic side view of a main part of a drum-shaped component processing device according to a conventional example, and a longitudinal sectional front view of a drum-shaped component processed by the same device.

FIG. 8 is a schematic side view of the drum-shaped component processing apparatus according to the conventional example.

FIG. 9 is a perspective view of a workpiece material and a processed product processed by the drum-shaped component processing apparatus.

[Explanation of symbols]

 11 grinding wheel 12 grinding surface of grinding wheel 14 cam roller 15 guide surface of cam roller 17 blade plate a drum-shaped part a 'work material

Continuation of the front page (72) Inventor Shugo Tsunoda 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Yuden Co., Ltd. (56) References JP-A-6-260357 (JP, A) JP-A-63-202010 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 17/00-17/08 H01F 41/00-41/12

Claims (2)

(57) [Claims] 1. A cylindrical material (a ') having a groove on a peripheral surface.
With the grinding surface (1) of the rotating disk-shaped grinding wheel (11).
2) and the guide peripheral surface (15) of the cam roller (14), and the peripheral surface of the material (a ') is sandwiched between the guide peripheral surface (15) of the cam roller (14) and the grinding surface of the grinding wheel (11). Surface (12)
In the drum-shaped part processing method in which the peripheral part of the raw material (a ′) is ground and processed into a drum shape, the raw material (a ′) to be ground is guided by the guide peripheral surface (15) of the cam roller (14). a ') A method for processing a drum-shaped part, wherein only the central portion of the peripheral surface is pressed against the grinding peripheral surface (12) of the grinding wheel (11). 2. A cylindrical material (a ') having a groove on a peripheral surface.
Rotating disc-shaped grinding wheel (1
1) and a guide peripheral surface (15) disposed opposite to the grinding peripheral surface (12) of the grinding wheel (11), and the guide peripheral surface (15) is used to cover the peripheral surface of the material (a '). Roller (14) that presses against the grinding surface (12) of the grinding wheel (11)
And a guide means disposed between the grinding peripheral surface (12) of the grinding wheel (11) and the guide peripheral surface (15) of the cam roller (14) and guiding the material (a '). In the component processing apparatus, the width of the guide peripheral surface (15) of the cam roller (14) is set to the grinding wheel (11) facing the same.
A drum-shaped part processing apparatus characterized in that the width is not more than the width of the grinding peripheral surface (12).