JP3114510B2 - Segment type grinding wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment type grinding wheel in which a cassette having abrasive layer segments fixed to an end face of an annular base metal is exchangeably fixed.

[0002]

2. Description of the Related Art In the field of surface grinders and double-headed grindstones, since a grindstone having a large outer diameter is required, segment-type grindstones have been frequently used. This type of segment type grinding wheel has a number of grooves formed radially or concentrically on the end face of the outer periphery of an annular base metal, and a separately formed metal bond abrasive grain layer segment is fitted into these grooves, and It is brazed.

According to the configuration in which only the abrasive layer segments are separately formed and attached to the base metal, the base metal does not have to be heated together when firing the abrasive layer segments. There is an advantage that a grindstone having a large diameter can be manufactured at a relatively low manufacturing cost by using the method.

[0004]

However, in the conventional segment grindstone, a groove is formed directly on the end face of the base metal to braze the abrasive grain layer segments. Therefore, the abrasive grain layer is worn or crushed by grinding. In that case, there is a problem that the entire base metal cannot be used.

[0005] When a segment type grinding wheel having a different outer diameter is used, all the parts must be remade, and the parts cannot be shared.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and enables a base metal to be reused even when an abrasive layer segment is worn out. It is an object of the present invention to provide a segment type grinding wheel that can share a segment.

[0007]

To achieve the above object, a segment type grinding wheel of the present invention comprises: an annular base metal;
The cassette includes a plurality of cassettes arranged in the circumferential direction along the end face of the base metal and fixed detachably, and a number of abrasive layer segments fixed to each of the cassettes. A linear ridge extending concentrically with the base metal and extending over the entire circumference of the end face is formed in a polygonal ring shape, and a contact surface of the cassette with the base metal end face has a width not less than the width of the ridge. A groove is formed linearly, and a plurality of pins located on one side of the ridge are provided on the cassette so as to be located in the groove, and are located on the other side of the ridge. An eccentric bolt is provided so that the eccentric bolt is screwed to the base metal, and the eccentric cam of the eccentric bolt and the plurality of pins support at least three points on both side surfaces of the ridge, The cassette is detachable from the base It is characterized in that it has configured to constant.

[0008]

According to the segment type grinding wheel of the present invention,
Since the abrasive layer segments are fixed to a common cassette, and these cassettes are detachably fixed to the end face of the base metal, when the abrasive layer segments are consumed, the cassettes are fixed while the base metal is fixed to the grinding machine. By exchanging, it is possible to make the abrasive layer segment new, it is possible to save the trouble of attaching and detaching a heavy metal base from the grinding machine, and to reduce the grinding cost by reusing the metal base .

Further, since the ridge is supported at least at three points from both sides by the eccentric cam and the pin, the cassette is mounted on the base metal, so that the strength of mounting the cassette against centrifugal force can be improved and high safety can be secured. . Further, by making the width of the groove on the concave side of the cassette wider than the width of the ridge on the convex side of the base metal, even when the curvature of the ridge of the base metal is different from the curvature of the groove of the cassette, three times. Point support makes it possible to fix the same cassette to a plurality of metal bases with different outer diameters without losing the fixing strength. As a result, cost can be reduced. Further, forming a linear groove in the cassette has a lower processing cost than forming a groove in an arc shape.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of one embodiment of a segment type grinding wheel according to the present invention as viewed from a grinding surface side. FIGS. 2 and 3 are cross-sectional views taken along line AA and line BB in FIG. 1, respectively. FIG.

As shown in FIGS. 1 to 3, this segment type grinding wheel comprises an annular first base metal 1 and an end face 1 thereof.
The main part is composed of a plurality of arc-shaped cassettes 10 arranged and fixed in the circumferential direction on a, and a large number of abrasive grain layer segments 24 and 26 fixed to the end faces of these cassettes 10, respectively. The left half of FIG. 1 shows a state in which the cassette 10 is fixed to the first base 1, and the right half shows a state in which the cassette 10 is removed from the first base 1.

The first base metal 1 is integrally formed of a metal such as aluminum, and a linear cassette fixing ridge 2 extending over the entire circumference of the base metal is concentrically formed in a regular octagonal shape on its end surface 1a. A bolt hole 4 (clamp), which is a total of eight screw holes, is formed at a position outside the cassette fixing ridge 2 by a fixed distance from the cassette fixing ridge 2 so as to be rotationally symmetrical around the grindstone axis at a period of 45 ° in the circumferential direction. Part of the means). The cassette fixing ridge 2 has a rectangular shape with a constant cross section over the entire circumference. The cassette fixing ridge 2 is not limited to an octagonal shape, but may be another polygonal shape.

Further, a tapered surface 6 is formed on the inner peripheral side of the end surface 1a of the first base metal 1, and the first base metal 1 is fixed to the spindle of the grinding machine on the back side of the tapered surface 6. Bolt holes 8 are formed at intervals in the circumferential direction.

On the other hand, the width of the cassette 10 is substantially equal to the width of the end face 1a of the first base 1, and the circumferential length of the cassette 10 is equal to or less than 1/8 of the entire circumference of the end face 1a. It is slightly shorter. As shown in FIGS. 2 and 3, the cassette 10 has a linear cassette fixing groove 12 (a cassette engaging portion) in which the cassette fixing ridge 2 is fitted with a sufficient margin on the abutting surface of the cassette 10 against the first base metal 1. The joint is formed over the entire length. That is, a cassette fixing groove 12 having a width equal to or larger than the width of the cassette fixing ridge 2 is formed in a straight line on a contact surface of the cassette 10 with the end surface of the first base 1. The depth of the cassette fixing groove 12 is substantially equal to the projecting amount of the cassette fixing ridge 2.

Each cassette 10 has a cassette fixing ridge 2
A plurality of (two in this embodiment) pins 3a and 3b located on one side (in this embodiment, the inner peripheral side 12b side) protrude respectively so as to be located in the cassette fixing groove 12. . Each cassette 10 includes a cassette fixing ridge 2.
The eccentric bolts 5 described later are provided so as to be located on the other side (the outer peripheral side 12a side). Pin 3
The positions where a and 3b are provided are the same distance from both ends of the cassette 10. The eccentric bolt 5 is provided between the pins 3a and 3b, and serves to fix the cassette 10 to the first base 1 or a second base described later.

As shown in FIG. 3, the structure of the eccentric bolt 5 includes, for example, an upper head 5a, a shaft portion 5d, and an eccentric cam 5.
b and a lower screw portion 5c. The cassette 10 is detachably fixed to the first base 1 by screwing the screw portion 5c of the eccentric bolt 5 into the bolt hole 4 of the first base 1. At this time, the eccentric cam 5b of the eccentric bolt 5 and the two pins 3a and 3b sandwich the cassette fixing ridge 2 on both sides (the outer peripheral side surface 12a and the inner peripheral side surface 12b) to support the cassette at three points. 10 is configured to be detachably fixed to the first base 1. A total of eight cassettes 10 are first
Is fixed detachably to the base metal 1.

As shown in FIG. 1 and FIG. 7, which is an enlarged view of a main portion of the cassette portion, a pair of arc-shaped segment fixing grooves extending in the circumferential direction are formed on the outer peripheral side and the inner peripheral side of the end face of the cassette 10. 18 and 20 are formed, and a plurality of segment fixing grooves 22 are formed in the radial direction. These segment fixing grooves 18, 20, and 22 have the same rectangular cross-sectional shape, and a square rod-shaped abrasive grain layer segment can be fitted into any of them. In the case of this embodiment, the abrasive grain layer segments 24 and 26 are fitted only in the segment fixing grooves 20 and 22 so as to form an L shape,
It is brazed. The abrasive layer segment 26 is curved along the segment fixing groove 20.

As a material for the abrasive layer segments 24 and 26, a metal bond abrasive layer in which superabrasives such as diamond or CBN are dispersed in a metal bonding phase is generally used.
The present invention is not limited thereto, and abrasive layer segments using other types of abrasive grains or binder phases can be used. The shape and number of the segment fixing grooves and the number and length of the abrasive grain layer segments may be arbitrarily changed as necessary, and may be arranged as shown in FIG. 8, for example.

On the other hand, FIG. 4 shows a second base 30 in this embodiment, and FIGS.
It is the sectional view on the A line, and the BB line sectional view. As shown in FIGS. 4 to 6, the second base 30 has a larger outer diameter than the first base 1 described above, but a total of eight cassettes 10 common to the first base 1 are provided. It can be mounted and can be used as a grinding wheel with an increased grinding radius. According to the present invention, not only the two types of first and second bases 1 and 30 can be replaced, but also three or more types of bases can be easily replaced.

The end face 30a of the second base metal 30 is the cassette 1
0, a linear cassette fixing ridge 32 (engaging portion of the second base metal) extending all around the end face 30a has a regular octagonal shape concentric with the grinding wheel axis. Is formed. The cross section of the cassette fixing ridge 32 is rectangular, and the projecting amount is the same as that of the cassette fixing ridge 2.

As shown in FIGS. 5 and 6, similarly to FIGS. 2 and 3, each cassette 1
The cassette eccentric bolt 12 is aligned with the cassette fixing groove 12, and the eccentric bolt 5 is screwed into a bolt hole 34, which will be described later, and tightened. Abut and two pins 3a,
3b abuts against the inner peripheral side surface 32b of the cassette fixing ridge 32, whereby the cassette 10 is supported at three points by the cassette fixing ridge 32, and is configured so as not to rattle in the grindstone radial direction. That is, the cassette fixing ridge 32 is supported by the second base 30 by being sandwiched between the eccentric cam 5b and the two pins 3a and 3b.
By increasing the width of the cassette fixing groove 12 or reducing the width of the cassette fixing groove 32, the cassette fixing protrusion 32 that can be supported at three points by the cassette fixing groove 12 is enlarged. Can be scaled.

As shown in FIG. 4, the end surface 30a of the second base metal 30 is rotationally symmetric about the grinding wheel axis at a period of 45 ° in the circumferential direction at a position outside a fixed distance from the cassette fixing ridge 2. Thus, a total of eight bolt holes 34 (part of the clamping means) are formed. When each cassette 10 is mounted on the cassette fixing ridge 32, the bolt holes 14 of the cassette 10 can be matched with the bolt holes 34, whereby a total of eight cassettes 10 are provided on the end face 30a. ,
The eccentric bolts 5 can be fixed at a pitch of 45 ° in the circumferential direction with a gap therebetween.

As shown in FIGS. 5 and 6, a tapered surface 36 is formed on the inner peripheral side of the end surface 30a of the second metal base 30, and the second metal base 30 is formed on the back side of the tapered surface 36. There are formed a plurality of bolt holes 38 for fixing the shaft to the spindle of the grinding machine. In this example, the first base 1 and the second base 1
The positions of the bolt holes 8 and 38 are common to both the base metal 30 and can be fixed to the same spindle. However, it is of course possible to adopt a configuration in which the bolt holes 8 and 38 are not fixed to the same spindle, and the positions of the bolt holes 8 and 38 may be changed.

According to the segment type grinding wheel having the above configuration, the abrasive grain layer segments 24 and 26 are fixed to the common cassette 10, and these cassettes 10
When the abrasive layer segments 24, 26 are worn out, the cassette 10 is replaced while the base metal 1 or 30 is fixed to the grinding machine to replace the abrasive layer segments 24, 26. Can be made new. Therefore, there is no need to attach and remove the heavy metal base 1 or 30 from the grinding machine, and the cost required for grinding can be reduced by reusing the metal bases 1 and 30.

The eccentric cam 5b of the eccentric bolt 5 for fixing the cassette 10 and a plurality of pins 3a, 3b formed on the back of the cassette 10 hold the linear cassette fixing ridge 2 or 32. By doing so, the mounting strength of the cassette 10 against centrifugal force is improved, and high security can be secured.

Further, since the cassette fixing groove 32 supports the cassette fixing protrusion 32 at three points, similarly to the case of the first base metal 1, the cassette 10 is connected to the cassette fixing protrusion 3.
2 can be fixed without play in the radial direction. According to this structure, the same cassette 1 can be mounted on base metals having different outer diameters without impairing the fixing strength of the cassette 10.
0 can be fixed, the grinding radius can be enlarged and reduced at low cost, and the cost can be reduced by using a common cassette 10.

Note that the present invention is not limited to the above-described embodiment, and the structure may be appropriately changed as needed. For example, the number of the cassettes 10 can be 7 or less or 9 or more, and the arrangement shape of the abrasive layer segments is oblique to the radial direction as illustrated in FIGS. 9 to 11. May be changed. Further, bolts may be used instead of pins. Further, as will be described later, eccentric bolts and pins may be provided on both sides of the ridge, or the ridge may be formed on the cassette 10 instead of the base.

FIG. 12 is an enlarged view of a main part according to another embodiment of the present invention, in which the radius of curvature of the base metal is smaller than the radius of curvature of the cassette, and FIG. Is larger than the radius of curvature. In this embodiment, in addition to the configuration of the above-described embodiment, the cassette 1
On the other hand, a plurality of pins 3c and 3d located on the other side (the outer peripheral side 12a side) of the ridge 2 are provided so as to be located in a groove (not shown) of the cassette 10, and The eccentric bolt 5 is located on one side (the inner peripheral side 12a side).
a is provided.

As shown in FIG. 12, in order to mount the cassette 10 on a base metal (not shown) having a relatively small outer diameter, the eccentric bolt 5a on the outer peripheral side surface 12a and the eccentric bolt 5a on the inner peripheral side surface 12b side are used.
The ridge 2 of the base is sandwiched between the pins 3a and 3b, thereby fixing the cassette to the base. In the drawing, O _d represents a center of curvature of the base metal, O _c represents the curvature center of the cassette 10.

As shown in FIG. 13, in order to mount the cassette 10 on a base metal (not shown) having a relatively large outer diameter, the eccentric bolt 5a on the inner peripheral side surface 12b side and the eccentric bolt 5a on the outer peripheral side surface 12a side are used.
The ridge 2 of the base is sandwiched between the pins 3c and 3d of the book, thereby fixing the cassette to the base. In the drawing, O _d represents a center of curvature of the base metal, O _c represents the curvature center of the cassette 10. That is, in both FIGS. 12 and 13, the cassette 10 is fixed to the base metal by three-point support.

FIG. 14 is a sectional view of an essential part corresponding to a sectional view taken along line AA of FIG. 1 according to still another embodiment of the present invention.
5 is a sectional view of a main part corresponding to the sectional view taken along line BB of FIG. In this embodiment, instead of forming a linear ridge on the base metal 1, the ridge 2 is formed on the cassette 10 in a linear shape .
Two pins 3 a (one pin is not shown) protrude from the base 1. An eccentric bolt 5 located on the outer peripheral side 2a side of the ridge 2 and two pins 3a located on the inner peripheral side 2b side
(One pin is not shown) sandwiches the ridge 2 to support the cassette 10 at three points. The configuration having two eccentric bolts and four pins shown in FIGS. 12 and 13 may be added to this embodiment.

In each of the embodiments described above, the cassette is supported at three points. However, the present invention is not limited to this, and a multipoint support structure having more points may be used.

[0033]

As described above, in the segment type grinding wheel according to the present invention, the abrasive layer segments are fixed to the common cassette, and these cassettes are detachably fixed to the base metal. When the layer segment is worn out, by replacing the cassette while fixing the base metal to the grinder, the abrasive layer segment can be brand new,
The trouble of attaching and detaching a heavy metal base from the grinding machine can be omitted, and the cost required for grinding can be reduced by reusing the metal base.

Further, by supporting the linear ridges formed on the back surface of the base metal or the cassette at three points, the mounting strength of the cassette against centrifugal force can be improved and high security can be secured. Further, according to such a configuration, it is possible to fix the same cassette to a plurality of metal bases having different outer diameters without losing the fixing strength, and it is possible to expand and reduce the grinding radius at a low cost, Cost reduction can be achieved by using a common cassette. Further, forming a linear groove in the cassette has a lower processing cost than forming a groove in an arc.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a segment type grinding wheel according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view showing a state in which the base metal (first base metal) of the embodiment is replaced with a second base metal having a large diameter.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a plan view of a cassette used in the embodiment.

FIG. 8 is a plan view showing a modification of the cassette.

FIG. 9 is a schematic view showing another example of the arrangement of the abrasive grain layer segments.

FIG. 10 is a schematic view showing another example of the arrangement of the abrasive grain layer segments.

FIG. 11 is a schematic view showing another example of the arrangement of the abrasive grain layer segments.

FIG. 12 is an enlarged view of a main part according to another embodiment of the present invention, showing a case where a radius of curvature of a base metal is smaller than a radius of curvature of a cassette.

FIG. 13 is an enlarged view of a main part according to another embodiment of the present invention, showing a case where a radius of curvature of a base metal is larger than a radius of curvature of a cassette.

FIG. 14 is a cross-sectional view of a principal part corresponding to a cross-sectional view along line AA of FIG. 1 according to still another embodiment of the present invention.

FIG. 15 is a cross-sectional view of a principal part corresponding to a cross-sectional view taken along line BB of FIG. 1 according to still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st base metal 1a End surface 2 Cassette fixing ridge 3a, 3b, 3c Pin 4 Bolt hole (screw hole) 5, 5A Eccentric bolt 5a Head 5b Eccentric cam 5c Screw part 5d Shaft part 6 Tapered surface 10 Cassette 12 Cassette fixing Groove 12a Outer side surface 12b Inner side surface 14 Through hole 18, 20, 22 Segment fixing groove 24 Abrasive layer segment 30 Second base metal 30a End surface 32 Cassette fixing ridge 32a Outer side surface 32b Inner side surface 34 Bolt hole (screw hole) ) 36 tapered face 40 abrasive grain layer segment O _d center of curvature of the center of curvature O _c cassette base metal

Continuation of the front page (72) Inventor Tetsuji Yamashita 246-1 Egoshi, Kurosuno, Izumi-cho, Iwaki-shi, Fukushima Prefecture Mitsubishi Materials Corporation Iwaki Seisakusho (56) References JP-A-7-299754 (JP, A) 58-140046 (JP, U) Actually open 49-48292 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24D 7/06 B24D 7/08

Claims (6)

(57) [Claims] 1. An annular base metal, a plurality of cassettes arranged circumferentially along an end face of the base metal and fixed detachably, and a number of abrasive layer segments fixed to each of the cassettes A linear ridge extending concentrically with the base and extending over the entire circumference of the end surface is formed in a polygonal annular shape on the end surface of the base, and the cassette is brought into contact with the base end surface. On the contact surface, a groove having a width equal to or greater than the width of the ridge is formed linearly, and a plurality of pins located on one side surface of the ridge are provided on the cassette so as to be located in the groove. And an eccentric bolt is provided so as to be located on the other side surface of the ridge. By screwing the eccentric bolt to the base metal, the eccentric cam of the eccentric bolt and the plurality of pins are used to form the ridge. By supporting at least three points on both sides of the cassette, A segment-type grinding wheel, which is configured to detachably fix the metal to the base. 2. The cassette further includes a plurality of pins located on the other side of the ridge so as to be located in the groove, and a plurality of pins located on one side of the ridge. The segment-type grinding wheel according to claim 1, wherein an eccentric bolt is provided on the grinding wheel. 3. An annular base metal, a plurality of cassettes arranged circumferentially along an end face of the base metal and fixed detachably, and a large number of abrasive grain layer segments fixed to each of the cassettes. A groove is formed on an abutting surface of the cassette with respect to the base metal end face, and a linear ridge is formed so as to be located in the groove, and the end face of the base metal is provided. A plurality of pins protrudingly provided on one side of the ridge, and further, the cassette is provided with an eccentric bolt so as to be positioned on the other side of the ridge. The cassette is detachably fixed to the base by screwing the base to at least three points on both sides of the ridge with the eccentric cam of the eccentric bolt and the plurality of pins. Characterized in that Segment type grinding wheel. 4. The base further includes a plurality of pins protruding on the other side of the ridge, and the cassette is eccentric so as to be positioned on one side of the ridge. The segment-type grinding wheel according to claim 3, wherein a bolt is provided. 5. The segment type grinding wheel according to claim 1, wherein a bolt is used instead of the pin. 6. A segment fixing groove is formed in a segment fixing surface of the cassette, and each of the abrasive grain layer segments is fitted and fixed in the segment fixing groove. 2. The segment grinding wheel according to claim 1.