JPH11188638A - Grinding wheel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the flawing of a ground work on a grinding wheel which is formed of a grindstone layer through a cushion layer on a backing. SOLUTION: A cushion grindstone layer 4 is formed annularly on a peripheral surface of a backing 2, on which a super abrasive grindstone layer 6 of a continuous structure to its circumference is formed. The super abrasive grindstone layer 6 is a vitrified bond grindstone which contains a diamond super abrasive or a cubic nitriding boron super abrasive, while the cushion grindstone layer 4 is a vitrified bond grindstone which contains a silicon carbide abrasive or an alumina abrasive. The cushion grindstone layer 4 is formed by joining a segment and next segment thereof from 4A to 4P divided along a peripheral direction with an adhesive 10. An inner surface of the super abrasive grindstone layer 6 is joined with an external surface of the cushion grindstone layer 4 by a adhesive 12, while an inner surface of the cushion grindstone layer 4 is joined with the corresponding external surface of backing 2 with a taper by an adhesive 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of grinding with a grindstone, and more particularly to the structure of a grinding wheel and a method of manufacturing the same.

[0002]

2. Description of the Related Art
Vitrified bond wheels using diamond superabrasives are used as grinding wheels suitable for grinding ceramic materials, and vitrified wheels using cubic boron nitride (CBN) superabrasives are used as suitable for grinding steel materials. Have been.

[0003] These grinding wheels have good grinding performance, but are expensive. It is possible to reduce the price by reducing the thickness of the grindstone used, but in that case, the distance from the grinding wheel base material (disk-shaped base metal) to the ground surface becomes small, This has a significant effect on the grinding characteristics and may reduce the grinding performance.

Therefore, in order to obtain good grinding performance while reducing the use of expensive abrasive grains, a vitrified bond grindstone similar to the superabrasive grain layer is provided between the superabrasive grain layer and the base metal. It has been considered that a grindstone layer using inexpensive silicon carbide-based abrasive grains or alumina-based abrasive grains is interposed as a cushion layer.

FIG. 6 is a partial side view of a grinding wheel using such a cushion layer. In FIG. 6, on an outer peripheral surface (having a cylindrical shape of a predetermined width) of an aluminum or steel base 2, a plurality of grinding stone layer segments 8A, 8B, 8C,.・
・ Attached. The grindstone layer segment 8A includes a cushion grindstone layer portion 4 'and a superabrasive grindstone layer portion 6'. The same applies to other grinding wheel layer segments.

[0006] Each grinding wheel layer segment has a general abrasive grain constituting the cushion grinding wheel layer portion 4 'carried by a vitrified binder to form the shape of the cushion grinding wheel layer portion 4'. Similarly, the super abrasive grain grinding wheel layer portion 6 ' Are formed on a vitrified binder to form the shape of the superabrasive grindstone layer portion 6 ′, and after superimposing, sintering, grindstone layer segments 8 A, 8 B, 8 C,.・ ・Next, the grinding wheel layer segments 8A, 8B, 8C,
... Are arranged, and the joining between the adjacent segments (joining between the ends in the circumferential direction) and the joining between each segment and the base metal 2 are performed with an adhesive. Thus, a grinding wheel having a structure in which the cushion grindstone layer 4 and the superabrasive grindstone layer 6 are laminated on the outer peripheral surface of the base metal 2 is obtained. The use of such segments facilitates the manufacture of the grinding wheel.

However, in such a grinding wheel, an epoxy resin or the like for joining the grinding wheel layer segments at regular intervals in the circumferential direction is provided on the outer peripheral surface of the superabrasive grinding wheel layer 6 serving as a grinding surface. An adhesive cured product is present. For this reason, there is a disadvantage that the cured adhesive material scrapes the object to be ground at the time of grinding and may damage the surface of the object to be ground.

[0008] Therefore, an object of the present invention is to sufficiently reduce the risk of damage to a ground product in a grinding wheel having a grindstone layer formed on a base material via a cushion layer.

[0009]

According to the present invention, there is provided a grinding wheel comprising a substantially disc-shaped base material and an annular grinding wheel layer formed on an outer peripheral surface of the base material. A cushion layer is interposed between the outer peripheral surface of the base material and the grinding wheel layer, the grindstone layer has a continuous structure in the circumferential direction, and the outer peripheral surface of the base material is tapered. The grinding wheel has a conical surface shape, and an inner peripheral surface of the cushion layer has a shape corresponding to an outer peripheral surface of the base material.

[0010] In one embodiment of the present invention, the cushion layer is an additional grindstone layer. In one embodiment of the present invention, the cushion layer includes a material similar to the binder of the grinding wheel layer.

According to the present invention, in order to achieve the above object, a first grinding wheel layer is formed annularly on the outer peripheral surface of a substantially disk-shaped substrate, and a second grinding wheel layer is formed on the first grinding wheel layer. A grinding wheel formed by forming a layer, wherein the second grinding wheel layer has a continuous structure in the circumferential direction, the outer peripheral surface of the base material is tapered and formed into a conical surface, A grinding wheel is provided, wherein an inner peripheral surface of the first grindstone layer has a shape corresponding to an outer peripheral surface of the base material.

In one embodiment of the present invention as described above,
The taper angle of the outer peripheral surface of the substrate is 2 to 15 degrees.

In one embodiment of the present invention, the outer peripheral surface of the base material and the inner peripheral surface of the cushion layer or the first grinding wheel layer, and the outer peripheral surface of the cushion layer or the first grinding wheel layer and the grinding wheel layer Alternatively, the inner peripheral surface of the second grindstone layer is bonded with an adhesive.

In one embodiment of the present invention, the cushion layer or the first grindstone layer comprises a plurality of segments divided in a circumferential direction.

In one embodiment of the present invention, adjacent ones of the segments are joined by an adhesive interposed at least in part between opposing circumferential ends.

In one embodiment of the present invention, the grinding wheel layer or the second grinding wheel layer is formed using a vitrified bond or resin bond grindstone containing diamond superabrasive grains or cubic boron nitride superabrasive grains.

In one embodiment of the present invention, the cushion layer or the first grindstone layer is formed by using a vitrified bond or resin bond grindstone containing silicon carbide abrasive grains or alumina abrasive grains.

Further, according to the present invention, there is provided a method of manufacturing the grinding wheel, wherein the cushion layer or the second grinding wheel layer is provided on an inner peripheral surface of the grinding wheel layer or the second grinding wheel layer. A plurality of segments constituting the first grindstone layer are joined with an adhesive, and the inner peripheral surface of the cushion layer or the first grindstone layer is adapted to the outer peripheral surface of the base material and joined with an adhesive. And a method of manufacturing a grinding wheel.

Further, according to the present invention, there is provided a method of manufacturing the above-mentioned grinding wheel, which achieves the above-mentioned object, wherein the above-mentioned cushion layer or the inner surface of the above-mentioned grinding wheel layer or the second grinding layer is provided. A plurality of segments constituting the first grindstone layer are joined with an adhesive, and at least some of the circumferential ends of adjacent segments are joined with an adhesive, and the cushion layer or the first grindstone layer is bonded. A method for manufacturing a grinding wheel, wherein an inner peripheral surface is fitted to an outer peripheral surface of the base material and bonded with an adhesive is provided.

In one embodiment of the present invention, the surface of the cushion layer or the first grindstone layer to be joined to the outer peripheral surface of the base material is ground prior to the joining to form a shape conforming to the outer peripheral surface of the base material. .

The present invention is also a grinding wheel in which a grinding wheel layer is formed annularly on the outer peripheral surface of a substantially disk-shaped base material, and at least the outer peripheral portion of the grinding wheel layer has a structure continuous in the circumferential direction. The outer peripheral surface of the base material is tapered to have a conical surface shape, and the inner peripheral surface of the grinding wheel layer has a shape corresponding to the outer peripheral surface of the base material. To provide a grinding wheel. Here, there is a mode in which the taper angle of the outer peripheral surface of the base material is 2 to 15 degrees. Further, there is a mode in which the outer peripheral surface of the grinding stone layer is formed in a cylindrical shape without taper.

The present invention also relates to a method for producing the grinding wheel, wherein the outer peripheral surface of the base material is tapered to form a conical surface, and the inner peripheral surface of the grinding wheel layer is formed of the base material. A method for manufacturing a grinding wheel, wherein the grinding wheel is formed in a shape corresponding to an outer peripheral surface, and the inner peripheral surface of the grinding wheel layer is adapted to the outer peripheral surface of the base material and bonded with an adhesive. .

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of a grinding wheel according to the present invention, and FIG. 2 is a partial sectional view thereof. FIGS. 3 and 4 are side views for explaining the manufacturing process of the grinding wheel of the present embodiment, and FIG. 5 is a partial cross-sectional view for explaining the manufacturing process of the grinding wheel of the present embodiment.

In manufacturing the grinding wheel of this embodiment, first, as shown in FIG. 3, a superabrasive vitrified bond grindstone layer 6 is prepared. This is obtained by dispersing and mixing diamond superabrasive grains or cubic boron nitride (CBN) superabrasive grains in a glass or ceramic binder, forming a predetermined ring shape, and sintering.

Next, as shown in FIG. 4, the ring-shaped cushion grindstone layer 4 is disposed inside the inner peripheral surface of the superabrasive grain vitrified bond grindstone layer 6. The cushion grindstone layer 4 is divided in the circumferential direction, and each divided portion is a cushion grindstone layer segment 4A to 4P.
The cushion grindstone layer segments 4A to 4P are formed by dispersing and mixing general abrasive grains such as silicon carbide abrasive grains or alumina abrasive grains in a glass-based or ceramic-based binder, forming a predetermined ring shape, and sintering. Obtained by: These cushion grindstone layer segments 4 </ b> A to 4 </ b> P are joined to each other in the circumferential direction by the adhesive 10. still,
The inner peripheral surface of the cushion grindstone layer 4 is tapered as described later.

In forming the cushion grindstone layer 4, the outer peripheral surface of each of the cushion grindstone layer segments 4A to 4P and the inner surface of the superabrasive grain vitrified bond grindstone layer 6 are bonded with an adhesive 12. At this time, the end faces of the cushion grindstone layer segments that are adjacent in the circumferential direction are simultaneously bonded with the adhesive 1.
0 can be joined. By joining the end faces, the cushion grindstone layer is integrated into a ring shape, and the strength of the grinding wheel is increased. However, the adhesive 10 interposed between the end faces of the cushion grindstone layer segments is
It is preferable that it is present on the entire end face of the cushion grindstone layer segment, but it may be present on a part thereof. In addition, the adhesive 10 is used to bond the grinding wheel layer segments 4A to 4P to the adhesive 12
When pressing against the inner surface of the superabrasive grain vitrified bond grindstone layer 6 through the above, an adhesive protruding between the end faces of the grindstone layer segments can be applied.

Prior to this step, at least one of the outer peripheral surface of each of the cushion grindstone layer segments 4A to 4P and the inner peripheral surface of the superabrasive grain vitrified bond grindstone layer 6 which are bonded to each other with an adhesive are connected to each other. Can be shaped by grinding to conform to Similarly, the end faces of the cushion wheel stone layer segments can be shaped by grinding so that the end faces of adjacent cushion wheel stone layer segments match each other.

Next, as shown in FIG. 5, the inner peripheral surface of the cushion grindstone layer 4 is attached to the outer peripheral surface of the disk-shaped wheel base material 2. The wheel base material 2 is an aluminum or steel base metal having a boss portion 2b having a mounting hole 2a for mounting to a driving rotary shaft at a center portion, and a grindstone layer supporting portion at an outer peripheral portion thereof. The outer peripheral surface of 2c has a conical shape with a width W. That is, the grindstone layer supporting unit 2
The outer peripheral surface of c is tapered (taper angle θ). The taper angle θ is, for example, 2 to 15 degrees. The inner peripheral surface of the cushion grindstone layer 4 has a shape corresponding to the outer peripheral surface of the base grindstone layer supporting portion 2c. This whetstone layer carrier 2c
Adhesive and the inner peripheral surface of the cushion grinding layer 4
Join with.

At the time of this joining, as shown in FIG. 5, an adhesive 14 is applied to the outer peripheral surface of the base grindstone layer supporting portion 2c, and the cushion grindstone layer 4 and the superabrasive vitrified bond grindstone layer 6 are applied. Is moved in the direction of the rotational symmetry center of the base 2 (indicated by an arrow), and the cushion grindstone layer 4 is moved.
Is adapted to the outer peripheral surface of the base material grinding wheel layer supporting portion 2c. In this way, by tapering the outer peripheral surface of the grindstone layer carrier 2c and the inner peripheral surface of the cushion grindstone layer 4,
When these surfaces are fitted to each other via the adhesive 14, the adhesive 14 having a proper and uniform thickness is formed without the adhesive 14 being scraped off, and thus good bonding strength is obtained. Such an effect is obtained when the grinding layer is a cushion grinding layer 4.
And a super-abrasive grain vitrified bond grindstone layer 6, which is obtained without being limited to a laminate, and the inner peripheral surface of a grindstone layer (a member including a layer exhibiting a grinding function and joined to the base) is formed of The same effect can be obtained as long as it has a shape corresponding to the tapered outer peripheral surface.

The taper angle θ is set mainly in consideration of the workability of joining the base 2 and the cushion grindstone layer 4 as described above and the uniformity of the thickness of the adhesive layer formed by this joining. And 2 to 15 degrees as described above. If the taper angle θ is less than 2 degrees and too small, the scraping of the adhesive 14 tends to increase and the workability tends to decrease, and the taper angle θ
Exceeds 15 degrees, the uniformity of the thickness of the adhesive layer tends to decrease. Further, the taper angle θ is 2 to 15
In the range of degrees, it is easy to apply a taper to the outer peripheral surface of the base grindstone layer supporting portion 2c, and the base 2 sufficiently supports the force applied when the object to be ground is ground by the outer peripheral surface of the grindstone layer 6. be able to. The taper angle θ is more preferably 3 to 7 degrees.

Prior to this step, the inner peripheral surface of the cushion grindstone layer 4 can be shaped by grinding so as to conform to the outer peripheral surface of the grindstone layer carrier 2c.

As described above, a grinding wheel as shown in FIGS. 1 and 2 is obtained.

Thereafter, if necessary, the hub 2b is attached to a drive rotating shaft to rotate the substrate 2, and the outer peripheral surface of the superabrasive grain vitrified bond grindstone layer 6, the superabrasive vitrified bond grindstone layer 6, and the cushion grindstone layer 4 can be shaped by grinding.

As an example of the dimensions of each part of the grinding wheel of the present embodiment manufactured as described above, the outer diameter Dφ is 350 mm, the width W is 20 mm, and the thickness T of the superabrasive vitrified bond grindstone layer 6 ₁ is 3mm, cushion whetstone layer 4
Has a thickness T ₂ of 5 mm.

According to the grinding wheel of the present embodiment as described above, since the superabrasive grain vitrified bond grindstone layer 6 having a grinding function has a continuous structure in the circumferential direction, the surface of the workpiece is damaged during grinding. Good grinding can be performed without such a problem. In this embodiment,
Since the cushion grindstone layer 4 is interposed between the superabrasive grain vitrified bond grindstone layer 6 and the base material 2 exhibiting the grinding function, the thickness of the expensive superabrasive grain vitrified bond grindstone layer 6 is reduced to reduce the thickness. Good grinding performance can be exhibited while realizing cost reduction. And, in the unlikely event that the superabrasive grain vitrified bond grindstone layer 6 exhibiting the grinding function is worn,
Even when a part of the outer peripheral surface of the cushion grinding stone layer 4 is exposed, the object to be ground can be ground by the cushion grinding stone layer 4, so that the object to be ground is not immediately damaged.

In the production of the grinding wheel as described above, the superabrasive grain vitrified bond grindstone layer 6 and the cushion layer 4 are separately sintered and bonded with an adhesive.
Super abrasive grain vitrified bond wheel layer 6 and cushion layer 4
The ring-shaped superabrasive grain vitrified bond grindstone layer 6 can be obtained by sintering without causing breakage such as cracks based on the difference in thermal expansion coefficient between the two, as in the case of sintering as a single body. Has brought the effect of the wheel.

In the above embodiment, the cushion grinding wheel layer 4 is used as the cushion layer or the first grinding wheel layer. However, the cushion layer or the first grinding wheel layer used in the present invention is, for example, a grinding wheel layer exhibiting a grinding function. A sintered body containing only a binder equivalent to the above binder is exemplified. Further, in the above embodiment, the cushion layer 4 made of general abrasive grain vitrified bond grindstone is used as the cushion layer or the first grindstone layer, but a resin bond grindstone layer of general abrasive grains can be used in the present invention.

In the above embodiment, the superabrasive vitrified bond grindstone layer 6 is used as a grindstone layer exhibiting a grinding function.
In the present invention, a vitrified bond grindstone layer of general abrasive grains and a resin bond grindstone layer of general abrasive grains can be used in the present invention.

[0040]

As described above, according to the present invention,
The grinding layer that performs the actual grinding action has a continuous structure in the circumferential direction, and a layer having a cushion function is formed under the grinding layer, so that the possibility of damage to the ground product is sufficiently reduced and good. There is provided a grinding wheel capable of performing a proper grinding.

According to the present invention, the outer peripheral surface of the substrate and the inner peripheral surface of the grindstone layer (a member including a layer exhibiting a grinding function and joined to the substrate) are tapered so that these can be formed. When the surfaces are fitted to each other with an adhesive, the adhesive is not scraped off, and an appropriate adhesive layer is formed. Thus, a grinding wheel having good bonding strength can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view of one embodiment of a grinding wheel according to the present invention.

FIG. 3 is a side view for explaining a manufacturing process of the grinding wheel according to the present invention.

FIG. 4 is a side view for explaining a manufacturing process of the grinding wheel according to the present invention.

FIG. 5 is a partial cross-sectional view for explaining a manufacturing process of the grinding wheel according to the present invention.

FIG. 6 is a partial side view of a grinding wheel using a cushion layer.

[Explanation of symbols]

 Reference Signs List 2 Wheel base material 2a Mounting hole 2b Boss part 2c Grinding stone layer carrier 4 Cushion grinding stone layer 4A-4P Cushion grinding stone layer segment 4 'Cushion grinding stone layer part 6 Super-abrasive grain vitrified bond grinding stone layer 6' Super-abrasive grinding stone layer part 8A- 8H Wheel layer segment 10, 12, 14 Adhesive

Claims (17)

[Claims] 1. A grinding wheel in which a grinding wheel layer is formed in an annular shape on an outer peripheral surface of a substantially disk-shaped substrate, and a cushion layer is interposed between the outer peripheral surface of the substrate and the grinding wheel layer. The grindstone layer has a continuous structure in the circumferential direction, the outer peripheral surface of the base material is tapered to have a conical surface, and the inner peripheral surface of the cushion layer is the base surface. A grinding wheel having a shape corresponding to an outer peripheral surface of a material. 2. The grinding wheel according to claim 1, wherein the cushion layer is an additional grindstone layer. 3. The grinding wheel according to claim 1, wherein the cushion layer contains a material similar to a binder of the grinding wheel layer. 4. An annular first base material is formed on an outer peripheral surface of a substantially disk-shaped base material.
A grinding wheel comprising a grinding wheel layer and a second grinding wheel layer formed on the first grinding wheel layer, wherein the second grinding wheel layer has a continuous structure in a circumferential direction, and an outer periphery of the base material. A grinding wheel, characterized in that the surface is tapered and conical, and the inner peripheral surface of the first grindstone layer has a shape corresponding to the outer peripheral surface of the substrate. 5. The taper angle of the outer peripheral surface of the base material is 2 to 5.
The grinding wheel according to any one of claims 1 to 4, wherein the angle is 15 degrees. 6. An outer peripheral surface of the base material and an inner peripheral surface of the cushion layer or the first grindstone layer, and an outer peripheral surface of the cushion layer or the first grindstone layer and the grinding grindstone layer or the second grindstone layer. The grinding wheel according to any one of claims 1 to 5, wherein both the inner peripheral surface and the inner peripheral surface are joined by an adhesive. 7. The grinding wheel according to claim 1, wherein the cushion layer or the first grindstone layer includes a plurality of segments divided in a circumferential direction. 8. Adjacent segments of the segments are joined by an adhesive interposed at least in part between opposing circumferential ends.
A grinding wheel according to claim 7. 9. The grinding wheel layer or the second grinding layer is formed by using a vitrified bond or resin bond grindstone containing diamond superabrasive grains or cubic boron nitride superabrasive grains. Item 10. The grinding wheel according to any one of Items 1 to 8. 10. The cushion layer or the first grindstone layer is formed using a vitrified bond or resin bond grindstone containing silicon carbide-based abrasive grains or alumina-based abrasive grains. The grinding wheel according to any one of claims 9 to 13. 11. A grinding wheel in which a grinding wheel layer is formed in an annular shape on an outer peripheral surface of a substantially disk-shaped substrate, at least an outer peripheral portion of the grinding wheel layer has a structure continuous in a circumferential direction, A grinding wheel, wherein an outer peripheral surface of the base material is tapered to have a conical surface shape, and an inner peripheral surface of the grindstone layer has a shape corresponding to an outer peripheral surface of the base material. 12. The taper angle of the outer peripheral surface of the substrate is 2
The grinding wheel according to claim 11, characterized in that the angle is between 15 and 15 degrees. 13. The grinding wheel layer according to claim 11, wherein an outer peripheral surface of the grinding wheel layer has a cylindrical shape without taper.
The grinding wheel according to any one of claims 12 to 12. 14. The method for manufacturing a grinding wheel according to claim 11, wherein an outer peripheral surface of the base material is tapered to form a conical surface, and the outer peripheral surface of the grinding wheel layer is formed. A grinding wheel, wherein a peripheral surface is formed in a shape corresponding to an outer peripheral surface of the base material, and an inner peripheral surface of the grindstone layer is fitted to an outer peripheral surface of the base material and bonded with an adhesive. Manufacturing method. 15. The method of manufacturing a grinding wheel according to claim 7, wherein the cushion layer or the first grinding wheel layer is formed on an inner peripheral surface of the grinding wheel layer or the second grinding layer. Manufacturing a grinding wheel, wherein a plurality of constituent segments are joined by an adhesive, and an inner peripheral surface of the cushion layer or the first grindstone layer is adapted to an outer peripheral surface of the base material and joined by an adhesive. Method. 16. The method of manufacturing a grinding wheel according to claim 8, wherein the cushion layer or the first grinding wheel layer is provided on an inner peripheral surface of the grinding wheel layer or the second grinding wheel layer. A plurality of constituent segments are joined with an adhesive, and at least a part of circumferential ends of adjacent ones of the segments are joined with an adhesive,
A method for manufacturing a grinding wheel, wherein an inner peripheral surface of the cushion layer or the first grindstone layer is fitted to an outer peripheral surface of the base material and bonded with an adhesive. 17. A method in which the surface of the cushion layer or the first grindstone layer joined to the outer peripheral surface of the base material is ground prior to the joining to form a shape adapted to the outer peripheral surface of the base material. A method for manufacturing a grinding wheel according to claim 15.