JPH0857770A - Segment type grinding wheel - Google Patents

Abstract

PURPOSE: To provide a segment type grinding wheel enabling the reuse of a base metal in the case of abrasive grain layer segment being consumed and enabling the common use of abrasive grain layer segments for a base metal with a different diameter. CONSTITUTION: The end face 1a of a first base metal 1 is provided with cassette fixing protrusions 2 formed in equilateral octagonal shape, and bolt holes 4 formed at constant angle pitch. A cassette 10 is provided with a cassette fixing groove formed to accommodate the cassette fixing protrusions 2, and bolt holes coinciding with bolts, and fixed by eccentric bolts 5. The lower face of the cassette 10 is protrusively provided with two pins 3a, 3b. The protrusion 2 is held by the eccentric cam of the eccentric bolt and two pins 3a, 3b, and the cassette 10 is fixed to the first base metal 1 by three-point support. Segment fixing grooves 18, 20, 22 are formed at the cassette 10, and abrasive grain layer segments 24, 26 are fixed therein. The cassette 10 can be also mounted to the cassette fixing protrusions, different in the radius of curvature, of a second base metal with a different outer diameter.

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 grain 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-sided grindstones, a grindstone having a large outer diameter is required, and thus segment type grindstones have been widely used. This kind of segmented grinding wheel, a large number of grooves are formed radially or concentrically on the end face of the outer periphery of the annular base metal, and the metal bond abrasive grain layer segments separately molded are fitted into these grooves, respectively. It is brazed.

According to the structure in which only the abrasive grain layer segment is separately formed and attached to the base metal in this way, the base metal does not have to be heated together when the abrasive grain layer segment is fired, so that a small baking facility is used. Has an advantage that a large-diameter grindstone can be manufactured at a relatively low manufacturing cost.

[0004]

By the way, the conventional segment grindstone has a structure in which a groove is directly formed on the end face of the base metal to braze the abrasive grain segment, so that 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.

Further, when segment type grinding wheels having different outer diameters are used, it is necessary to remake all the parts, and the parts cannot be shared, so that there is a problem that the cost increases accordingly.

The present invention has been made in view of the above problems of the prior art. The base metal can be reused even when the abrasive grain layer segment is consumed, and the abrasive grain layer can be used in the base metals having different diameters. It is an object of the present invention to provide a segment type grinding wheel that can share segments.

[0007]

A segment type grinding wheel of the present invention for achieving the above object comprises an annular base metal,
A plurality of cassettes that are arranged in the circumferential direction along the end face of the base metal and are detachably fixed, and a plurality of abrasive grain layer segments fixed to each of these cassettes, and the end face of the base metal is A linear projection that is concentric with the base metal and extends over the entire circumference of the end surface is formed in a polygonal ring shape, and the contact surface of the cassette with the base metal end surface has a width equal to or larger than the width of the projection. The groove is formed in a straight line, and a plurality of pins located on one side surface side of the protrusion are provided on the cassette so as to be located in the groove and located on the other side surface side of the protrusion. Is provided with an eccentric bolt, by screwing the eccentric bolt to the base metal, by supporting at least three side surfaces of the ridge by the eccentric cam of the eccentric bolt and the plurality of pins, The cassette can be attached to and detached from the base metal 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 grain layer segments are fixed to a common cassette and these cassettes are detachably fixed to the end surface of the base metal, when the abrasive grain layer segments are worn out, the cassette is kept fixed on the grinding machine. It is possible to renew the abrasive grain layer segment by replacing it, and it is possible to save the labor of attaching and detaching the heavy base metal from the grinding machine, and also to reduce the grinding cost by reusing the base metal. .

Further, since the cassette is attached to the base metal by supporting the ridge with at least three points from both sides by the eccentric cam and the pin, the attachment strength of the cassette against centrifugal force is improved and high safety can be secured. . Furthermore, 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 if the curvature of the ridge of the base metal is different from the curvature of the groove on the cassette, Since it supports points, it is possible to fix the same cassette to multiple base metals with different outer diameters without impairing the fixing strength, expand and reduce the grinding radius at low cost, and make the cassette common This can reduce costs. Further, forming a linear groove on the base metal is lower in processing cost than forming an arc-shaped groove.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a plan view of an embodiment of a segmented grinding wheel according to the present invention viewed from the grinding surface side, and FIGS. 2 and 3 are cross-sectional views taken along the line AA and the line BB of FIG. 1, respectively. It is a figure.

As shown in FIG. 1 to FIG. 3, this segment type grinding wheel comprises an annular first base metal 1 and an end face 1 thereof.
A plurality of arcuate cassettes 10 are arranged side by side in the circumferential direction on the cassette a and are fixed, and a large number of abrasive grain layer segments 24 and 26 are fixed to the end faces of the cassettes 10, respectively. The left half of FIG. 1 shows a state in which the cassette 10 is fixed to the first base metal 1, and the right half shows a state in which the cassette 10 is removed from the first base metal 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 the end surface 1a. Further, bolt holes 4 (clamp holes 4), which are eight screw holes in total, are formed at a position outside the cassette fixing ridge 2 by a certain distance so as to be rotationally symmetrical about the grindstone axis at a circumferential 45 ° cycle. Part of the means) is formed. The cassette fixing ridge 2 has a rectangular shape whose cross section is constant over the entire circumference. The cassette fixing ridge 2 is not limited to the octagonal shape, and may have another polygonal shape.

A taper 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 taper surface 6. A plurality of 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 surface 1a of the first base metal 1, and the length of the cassette 10 in the circumferential direction is equal to or 1/8 of the entire circumference of the end surface 1a. It is slightly shorter. As shown in FIGS. 2 and 3, on the contact surface of the cassette 10 to the first base metal 1, there is a linear cassette fixing groove 12 (cassette engagement groove) into which the cassette fixing protrusion 2 fits with a sufficient margin. A joint) is formed over its entire length. That is, on the contact surface of the cassette 10 with the end surface of the first base metal 1, a cassette fixing groove 12 having a width equal to or larger than the width of the cassette fixing protrusion 2 is linearly formed. The depth of the cassette fixing groove 12 is substantially equal to the protrusion amount of the cassette fixing protrusion 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 surface side (in this embodiment, the inner peripheral side surface 12b side) are respectively provided so as to project in the cassette fixing groove 12. . In addition, each cassette 10 has a cassette fixing protrusion 2
Eccentric bolts 5 described later are provided so as to be located on the other side surface side (the outer peripheral side surface 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 in the middle of the pins 3a and 3b, and is for fixing the cassette 10 to the first base metal 1 and a second base metal 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 the lower threaded portion 5c. By screwing the screw portion 5c of the eccentric bolt 5 into the bolt hole 4 of the first base metal 1, the cassette 10 is detachably fixed to the first base metal 1. At this time, the eccentric cam 5b of the eccentric bolt 5 and the two pins 3a, 3b sandwich the both side surfaces (the outer peripheral side surface 12a and the inner peripheral side surface 12b) of the cassette fixing ridge 2 to support them at three points. 10 is configured to be detachably fixed to the first base metal 1. Eight cassettes 10 in total are arranged at a pitch of 45 ° in the circumferential direction.
It is detachably fixed to the base metal 1.

As shown in FIG. 1 and FIG. 7, which is an enlarged view of the 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 surface of the cassette 10. 18, 20 are formed, and a plurality of segment fixing grooves 22 are further formed in the radial direction. These segment fixing grooves 18, 20, 22 are rectangular in cross section, and square rod-shaped abrasive grain layer segments can be fitted therein. 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 grain layer segment 26 is curved along the segment fixing groove 20.

As a material for the abrasive grain layer segments 24 and 26, a metal bond abrasive grain layer in which superabrasive grains such as diamond and CBN are dispersed in a metal bonding phase is generally used.
The present invention is not limited thereto, and other types of abrasive grains or abrasive grain layer segments using a bonded phase can also be used. The shape and number of segment fixing grooves, and the number and length of 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 the second base metal 30 in this embodiment, and FIG. 5 and FIG. 6 respectively show A- of FIG.
It is the sectional view on the A line and the sectional view on the BB line. As shown in FIGS. 4 to 6, the second base metal 30 has an outer diameter larger than that of the first base metal 1 described above, but a total of eight cassettes 10 common to the first base metal 1 are provided. It can be mounted and can be used as a grinding wheel with an increased grinding radius. It should be noted that the present invention makes it possible not only to replace the two types of first and second base metals 1 and 30 but also to enable the exchange of three or more types of base metals.

The end surface 30a of the second base metal 30 is the cassette 1
The end face 30a has substantially the same width as 0, and a straight cassette fixing protrusion 32 (engaging portion of the second base metal) extending over the entire circumference is equilaterally octagonal with the grindstone axis. Is formed in. The cassette fixing ridge 32 has a rectangular cross section, and the amount of protrusion thereof is the same as that of the cassette fixing ridge 2.

As shown in FIGS. 5 and 6, as in FIGS. 2 and 3, each set fixing ridge 32 is attached to each cassette 1.
By aligning the cassette fixing groove 12 of 0 and screwing the eccentric bolt 5 into the bolt hole 34 described later, the eccentric cam 5b of the eccentric bolt 5 is attached to the outer peripheral side surface 32a of the circumferential end of the cassette fixing ridge 32. Abut and two pins 3a,
3b abuts on the inner peripheral side surface 32b of the cassette fixing ridge 32, whereby the cassette 10 is supported by the cassette fixing ridge 32 at three points and is structured so as not to rattle in the radial direction of the grindstone. That is, the cassette fixing ridge 32 can be supported by the second base metal 30 by being sandwiched by the eccentric cam 5b and the two pins 3a, 3b.
By increasing the width of the cassette fixing groove 12 or reducing the width of the cassette fixing protrusion 32, the cassette fixing protrusion 32 that can be supported at three points in 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 symmetrical about the axis of the grindstone at a position of a fixed distance outside the cassette fixing ridge 2 in the circumferential 45 ° cycle. Thus, a total of eight bolt holes 34 (a part of the clamping means) are formed. Then, with each cassette 10 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 base metal 30, and the second base metal 30 is formed on the back side of the tapered surface 36. Is formed with a plurality of bolt holes 38 for fixing to the spindle of the grinder. In this example, the first base metal 1 and the second base metal 1
The base metal 30 has the same bolt holes 8 and 38, and can be fixed to the same spindle. However, it is of course possible to use a structure in which the bolts 8 and 38 are not fixed to the same spindle, and the positions of the bolt holes 8 and 38 may be mutually changed.

According to the segment type grinding wheel having the above structure, the abrasive grain layer segments 24 and 26 are fixed to the common cassette 10, and these cassettes 10 are connected to the base metal 1 or 3.
Since it is detachably fixed to 0, when the abrasive grain layer segments 24 and 26 are consumed, the cassette 10 is replaced with the base metal 1 or 30 fixed to the grinder to replace the abrasive grain layer segments 24 and 26. Can be brand new. Therefore, it is not necessary to detach the heavy base metal 1 or 30 from the grinder, and the cost required for grinding can be reduced by reusing the base metals 1 and 30.

Further, 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 surface of the cassette 10 sandwich the linear cassette fixing ridge 2 or 32. By doing so, the mounting strength of the cassette 10 against centrifugal force can be improved and high safety can be secured.

Further, since the cassette fixing projections 32 are supported at three points by the cassette fixing groove 12, the cassette 10 is fixed to the cassette fixing projections 3 as in the case of the first base metal 1.
It can be fixed to the No. 2 without rattling in the radial direction. According to this structure, with respect to base metals having different outer diameters, the same cassette 1 can be used without impairing the fixing strength of the cassette 10.
It is possible to fix 0, the grinding radius can be expanded or reduced at a low cost, and the cost can be reduced by sharing the cassette 10.

The present invention is not limited to the above-mentioned embodiment, and the structure may be changed as necessary. For example, the number of cassettes 10 can be 7 or less, or 9 or more, and the arrangement shape of the abrasive grain layer segments can be set obliquely with respect to the radial direction as illustrated in FIGS. 9 to 11. You may change it. Also, a bolt may be used instead of the pin. 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 metal.

FIG. 12 is an enlarged view of a main part according to another embodiment of the present invention, showing a case where the radius of curvature of the base metal is smaller than the radius of curvature of the cassette, and FIG. 13 is shown in FIG. The case is larger than the radius of curvature of. In this embodiment, in addition to the configuration of the above-described embodiment, the cassette 1
At 0, a plurality of pins 3c and 3d located on the other side surface side of the ridge 2 (on the side of the outer peripheral side surface 12a) are provided so as to be located in the groove (not shown) of the cassette 10, and the ridge 2 Eccentric bolt 5 so that it is located on one side surface side (inner peripheral side surface 12a side)
a is provided.

As shown in FIG. 12, when mounting 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 side and the eccentric bolt 5a on the inner peripheral side surface 12b side are mounted.
The ridge 2 of the base metal is sandwiched between the pins 3a and 3b of the book, whereby the cassette is fixed to the base metal. In the figure, O _d represents the center of curvature of the base metal, and O _c represents the center of curvature of the cassette 10.

As shown in FIG. 13, 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 mounted.
The ridge 2 of the base metal is sandwiched between the pins 3c and 3d of the book, whereby the cassette is fixed to the base metal. In the figure, O _d represents the center of curvature of the base metal, and O _c represents the center of curvature 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 a main part corresponding to a sectional view taken along the line AA of FIG. 1 according to still another embodiment of the present invention.
5 is a cross-sectional view of an essential part corresponding to the cross-sectional view taken along the line BB of FIG. In this embodiment, instead of forming the arc-shaped ridges on the base metal 1, the ridges 2 are formed on the cassette 10 in the arc-shape, and
Two pins 3a (one pin is not shown) are projected on the base metal 1. An eccentric bolt 5 located on the outer peripheral side surface 2a side of the ridge 2 and two pins 3a located on the inner peripheral side surface 2b side
The cassette 10 is supported at three points by sandwiching the ridge 2 with (one pin is not shown). The structure having two eccentric bolts and four pins shown in FIGS. 12 and 13 may be added to the present embodiment.

In each of the above-mentioned embodiments, the cassette supports three points, but the present invention is not limited to this, and a multi-point support structure of more than that may be used.

[0033]

As described above, in the segment type grinding wheel according to the present invention, since the abrasive grain layer segments are fixed to the common cassette and these cassettes are detachably fixed to the base metal, the abrasive grains When the layer segment is exhausted, the abrasive grain layer segment can be renewed by replacing the cassette while fixing the base metal to the grinder.
It is possible to save the labor of attaching and detaching a heavy base metal from the grinding machine, and by reusing the base metal, the cost required for grinding can be reduced.

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

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a segmented grinding wheel according to the present invention.

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

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

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.

5 is a cross-sectional view taken along the line AA of FIG.

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

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

FIG. 8 is a plan view showing a modified example of the cassette.

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

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

FIG. 11 is a schematic view showing another arrangement example of 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 the radius of curvature of the base metal is smaller than the radius of curvature of the cassette.

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

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

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

[Explanation of symbols]

1 1st base metal 1a End surface 2 Cassette fixing projection 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 peripheral side surface 12b Inner peripheral side surface 14 Through hole 18, 20, 22 Segment fixing groove 24 Abrasive grain layer segment 30 Second base metal 30a End surface 32 Cassette fixing ridge 32a Outer peripheral side surface 32b Inner peripheral side surface 34 Bolt hole (screw hole ) 36 taper surface 40 abrasive grain segment segment O _d center of curvature of base metal O _c center of curvature of cassette

Claims (6)

[Claims] 1. An annular base metal, a plurality of cassettes arranged in a circumferential direction along the end face of the base metal and fixed detachably, and a large number of abrasive grain layer segments fixed to each of these cassettes. A linear projection that is concentric with the base metal and extends over the entire circumference of the end face is formed in a polygonal annular shape on the end face of the base metal, and the linear protrusion is applied to the end face of the base metal of the cassette. A groove having a width equal to or larger than the width of the protrusion is linearly formed on the contact surface, and a plurality of pins located on one side surface of the protrusion 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 side of the ridge, and the ridge is formed by the eccentric cam of the eccentric bolt and the plurality of pins by screwing the eccentric bolt to the base metal. By supporting at least three points on both sides of the cassette, The segment type grinding wheel is characterized in that the blade is detachably fixed to the base metal. 2. The cassette is further provided with a plurality of pins located on the other side surface of the ridge so as to be located in the groove and located on the one side surface of the ridge. The segment type grinding wheel according to claim 1, wherein an eccentric bolt is provided on the. 3. An annular base metal, a plurality of cassettes which are arranged in the circumferential direction along the end surface of the base metal and are detachably fixed, and a large number of abrasive grain layer segments fixed to each of these cassettes. A groove is formed on the contact surface of the cassette with the end surface of the base metal, and a linear ridge is formed so as to be located in the groove, and the end surface of the base metal is formed. A plurality of pins that are located on one side surface side of the ridge, and the cassette is provided with an eccentric bolt so as to be located on the other side surface side of the ridge. The cassette is detachably fixed to the base metal by being screwed onto the base metal so that at least three side surfaces of the ridge are supported by the eccentric cam of the eccentric bolt and the plurality of pins. It is characterized in that it is configured to Segment type grinding wheel. 4. The base metal is further provided with a plurality of pins projecting from the other side surface of the projection, and the cassette is eccentric so as to be located on one side surface of the projection. 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. The segment fixing surface of the cassette is formed with a segment fixing groove, and each of the abrasive grain layer segments is fitted and fixed in the segment fixing groove. The segmented grinding wheel according to item 1.