JP3273020B2 - Method for producing vitrified grinding stone from grinding stone waste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a grindstone portion composed of a vitrified grindstone structure in which abrasive grains are bonded by an inorganic binder, and a support portion made of an inorganic material for exclusively supporting the grindstone portion, The present invention relates to a method for manufacturing a vitrified whetstone using whetstone waste as a raw material.

[0002]

2. Description of the Related Art A vitrified grindstone is uniformly formed from an inner peripheral portion to an outer peripheral portion, for example, by a vitrified grindstone structure in which abrasive grains are bonded by an inorganic binder. Alternatively, it is constituted by impregnating a synthetic resin into the inner periphery of an outer peripheral grindstone portion made of a vitrified grindstone structure and reinforced.

[0003]

By the way, in the above-mentioned vitrified grinding wheel manufacturing process, finishing scraps, chips or shapes discharged from a finishing process for finishing the shape or the like of the unfired or fired grinding wheel are removed. As a result, there has been a problem that grinding stones such as discarded grinding stones which have become defective in inspection or have been used are generated, and it is difficult to treat waste and secure a disposal site. In particular, since unfinished product finishing waste contains organic matter such as dextrin, wastewater management such as BOD concentration tends to be a problem, and disposal costs have been further increased.

[0004] On the other hand, simply grinding and classifying the grinding stone waste and mixing it into the grinding wheel raw material causes unstable properties of the grinding stone waste, thereby deteriorating the grinding performance and high-speed rotation strength of the vitrified grinding wheel. There was a problem that would.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to obtain the grinding performance and high-speed rotational strength performance of a vitrified grinding wheel at once using grinding stone waste as a raw material. It is an object of the present invention to provide a method for producing a vitrified grinding wheel using a grinding wheel waste as a raw material.

[0006]

The present inventors have made various studies based on the above circumstances, and as a result, the vitrified grindstone has a structure in which the abrasive grains are combined with an inorganic binder in order to exclusively grind the work material. Focusing on the point that it consists of a grindstone part composed of a vitrified grindstone structure and a support part that requires strength exclusively to support the grindstone part, a grindstone that contains abrasive grains of the same type as the grindstone part as a raw material for the support part It has been found that by using waste and adding an appropriate amount of an inorganic binder thereto, grinding performance is not required but a vitrified grinding wheel structure of high strength can be constructed. For example, in recent high-speed grinding, for example, high-speed grinding of about 3600 to 4800 m / min, a conventional vitrified grindstone usually deals with a porous and soft-bonded vitrified grindstone structure, but the demand for high-speed grinding increases. Accordingly, the strength required for the core portion is in conflict with the strength required for the core portion, and the strength of the core portion has become a bottleneck.

[0007] The method of the present invention has been made based on the above-mentioned findings, and the gist of the method is that a grindstone portion composed of a vitrified grindstone structure in which abrasive grains are bound by an inorganic binder, and an exclusive use of the grindstone portion. A method of manufacturing a vitrified whetstone having a support portion made of an inorganic material for supporting the whetstone portion, and using a whetstone waste as a raw material, wherein (a) a non-fired product or a fired Product dimensions
Shavings generated from the finishing process, or grinding waste as a waste grinding stone, 2 to 3 parts per 100 parts of the grinding stone waste
An adjusting step of adjusting the material of the support portion made of the inorganic material by further adding and mixing 0 parts by weight of an inorganic binder, and (b) adjusting the material of the support portion adjusted by the adjusting step to a predetermined shape. Forming and firing step of forming a support portion made of an inorganic material of a predetermined shape by molding and firing, (c)
It is intended to include a bonding step of bonding the support portion made of an inorganic material formed by the molding and firing step and the grinding stone portion to integrate them with each other.

[0008]

In this way, the material of the support portion adjusted by adding and mixing the inorganic binder to the grinding wheel waste of the vitrified grinding wheel is formed into a predetermined shape and fired. The vitrified grindstone is formed by bonding the inorganic material supporting portion and the grindstone portion made of the vitrified grindstone structure to each other. That is, at the time of forming the support portion, the material of the support portion made of the inorganic material is adjusted by further adding and mixing an inorganic binder to the grindstone waste generated from the manufacturing process of the vitrified grindstone. A vitrified grindstone having a support made of an inorganic material having a vitrified grindstone structure is obtained. As a result, the grinding performance and the high-speed rotation strength performance of the vitrified grinding wheel can be obtained all at once, and at the same time, the grinding wheel waste can be reduced, and the difficulty in processing waste and securing a disposal site can be reduced. Ma
In addition, the grinding stone waste is a vitrified grinding stone manufacturing process.
Of the unfinished or fired products
Unsintered products because they are shavings or discarded whetstones
Or it can reduce grinding stone waste originating from fired products
Alleviate the difficulties of treating waste and securing disposal sites.
it can. 2 to 30 for 100 parts of grinding stone waste
Because of the addition of parts by weight of inorganic binder,
The bending strength of the support part made of machine material is suitably improved. Inorganic
When the amount of the mixture is less than 2 parts by weight, the strength of the supporting portion is sufficiently obtained.
If it exceeds 30 parts by weight, the shrinkage of firing will increase and it will be supported
The variation in the outer diameter of the part increases, and the gap and
Adhesive strength varies and relatively expensive inorganic binder
The use amount increases and the manufacturing cost increases.

[0009]

[0010]

[0011]

[Another embodiment of the invention] Here, preferably, the granule size of more than half of the abrasive material of the abrasive included in the support portion is a particle size substantially the same as the abrasive material contained in the grinding wheel portion, or It has a smaller particle size. Further, the abrasive contained in the support portion is the above-mentioned grindstone waste and is 80th to 1st.
The particles have a particle size in the range of No. 20. In this case, the bending strength of the support portion made of the inorganic material is suitably improved.

Preferably, the grindstone portion and the support portion are bonded to each other with an epoxy resin-based or phenol resin-based thermosetting resin adhesive. With this configuration, the support portion made of the inorganic material can be easily formed from the grindstone waste independently of the grindstone portion, and the reliability of bonding can be improved.

Preferably, the grindstone portion has an annular shape, and in the forming and firing step, a disk-shaped inorganic material supporting portion having an outer diameter similar to the inner diameter of the grindstone portion is formed. Wherein the bonding step is performed by bonding the outer peripheral surface of the support portion and the inner peripheral surface of the outer peripheral grindstone portion formed by the molding and firing step to each other by bonding with a thermosetting resin adhesive. Thus, a vitrified grinding wheel is formed. In this way, the disk-shaped support portion made of inorganic material can be easily formed of grinding wheel waste independently of the annular grinding wheel portion, and the reliability of adhesion of the vitrified grinding wheel can be enhanced.

Preferably, the inner peripheral surface of the annular grindstone portion and the outer peripheral surface of the disk-shaped support portion made of inorganic material include:
A tapered surface inclined at the same angle with respect to the axis is formed, and in the bonding step, the inner peripheral surface of the annular grindstone portion and the outer peripheral surface of the disk-shaped inorganic material supporting portion are mutually connected. It is to be glued. This has the advantage that uneven bonding and misalignment are suitably prevented.

[0015] Preferably, the tapered surface is inclined within a range of 1 to 3 degrees, more preferably within a range of 1.5 to 2.5 degrees with respect to the axis. If the angle is smaller than 1.5 degrees, the work of interposing the adhesive becomes difficult, and uneven bonding is likely to occur. If the angle is smaller than 1 degree, the work of interposing the adhesive is extremely difficult. And uneven bonding occurs. In addition, when the angle is larger than 2.5 degrees, misalignment between the outer peripheral grindstone portion and the disk-shaped support portion is likely to occur, and when the angle is larger than 3 degrees, the outer peripheral grindstone portion is increased. The misalignment between the support and the support part becomes extremely large, and the work load in the finishing step of the grindstone increases.

Preferably, the bonding step includes bonding the outer peripheral surface of the disk-shaped support portion and the inner peripheral surface of the annular outer peripheral grindstone portion to a thickness of 0.2 to 0.6 mm. is there.
With this configuration, the adhesive layer formed between the outer peripheral surface of the disk-shaped support portion and the inner peripheral surface of the annular outer peripheral grindstone portion has a thickness of 0.2 to 0.6 mm. Reliability is improved. If the thickness is less than 0.2 mm, uneven adhesion is likely to occur and the bonding strength varies.If the thickness exceeds 0.6 mm, misalignment between the outer grinding wheel portion and the disk-shaped support portion occurs, which affects dynamic balance. It is easy to get out.

[0017]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a vitrified grinding wheel 10 according to one embodiment of the present invention. This vitrified whetstone 10
Is formed as a whole, is composed of an annular outer peripheral grindstone portion 12 composed of a vitrified grindstone structure in which abrasive grains are combined with an inorganic binder to exclusively grind the work, and a vitrified grindstone structure similar thereto, On the inner peripheral side of the outer peripheral grindstone portion 12, there is provided a grindstone supporting portion, that is, a core portion 14, which is fixed to exclusively support the outer peripheral grindstone portion 12. The vitrified whetstone structure of the outer peripheral whetstone part 12 is:
It is well known that abrasive grains or abrasives such as silicon carbide (SiC) or fused alumina (Al ₂ O ₃ ) are formed of a glassy inorganic bond containing silicon oxide (SiO ₂ ) as a main component. It is a porous vitrified grindstone structure that is bound by an agent (vitrified bond) and has numerous continuous or discontinuous pores. In such a vitrified whetstone structure, at the time of grinding, the abrasive grains on the grinding surface that is in sliding contact with the workpiece are appropriately crushed or fall off, and the cutting edge of the abrasive grains is suitably regenerated.

Since the core portion 14 has the same coefficient of thermal expansion as that of the outer peripheral grindstone portion 12, the same kind of abrasive material and inorganic binder as the outer peripheral grindstone portion 12, that is, silicon carbide (Si) is used.
C) vitreous or fused alumina (Al ₂ O ₃ ) vitreous and vitreous material mainly composed of silicon oxide (SiO ₂ ) adjusted to have the same coefficient of thermal expansion as that of the vitreous abrasive for bonding the same , But the weight ratio of the inorganic binder to the outer peripheral grindstone portion 12 is increased.
For example, 2 to 30 parts by weight of inorganic binder (peripheral grindstone 1
2 having the same fire resistance and coefficient of thermal expansion made of the same material as the inorganic binder of No. 2), the weight ratio of the inorganic binder is increased. When the amount of the inorganic binder is less than 2 parts by weight, the strength of the supporting portion cannot be sufficiently obtained. The strength varies, and the amount of the relatively expensive inorganic binder used increases, which increases the production cost.

The core portion 14 of the vitrified grindstone 10 of the present embodiment has a vitrified grindstone structure similar to that of the outer grindstone portion 12, but is composed of a vitrified grindstone structure containing a larger amount of an inorganic binder.
Is adhered to the inner peripheral surface of the. As shown in detail in the cross-sectional view of FIG. 2, the inner peripheral surface 18 of the outer peripheral grindstone portion 12 has a center line C
Angle of 1 to 3 degrees, preferably about 2 degrees
Similarly, the outer peripheral surface 20 of the core portion 14 also has an angle θ within a range of 1 to 3 degrees with respect to the center line C, preferably about 2 °. The outer peripheral whetstone portion 1 is formed in an inclined tapered surface shape.
The inner peripheral surface 18 and the outer peripheral surface 20 of the core portion 14 are bonded to each other via an adhesive layer 22, whereby the outer peripheral grindstone portion 12 and the core portion 14 are integrally joined. FIG.
Although it is drawn much thicker than it actually is in order to facilitate understanding, the adhesive layer 22 has a thickness of, for example, about 0.2 to 0.6 mm. A thermosetting resin adhesive such as a phenol resin adhesive or a phenol resin adhesive is used. 0.2
If the thickness is smaller than 0 mm, uneven bonding is likely to occur and the bonding strength varies.If the thickness is larger than 0.6 mm, misalignment between the outer grinding wheel portion 12 and the core portion 14 occurs. The dynamic balance is likely to be affected. The angle θ between the inner peripheral surface 18 and the outer peripheral surface 20 is, for example, in the range of 1 to 3 degrees, and preferably in the range of 1.5 to 2.5 degrees. When the angle is smaller than 1.5 degrees, the work of interposing the adhesive becomes difficult, and uneven bonding is likely to occur. When the angle is smaller than 1 degree, the work of interposing the adhesive is extremely difficult. And uneven bonding occurs. When the angle is larger than 2.5 degrees, the misalignment between the outer peripheral grindstone portion 12 and the core portion 14 is likely to occur. The misalignment between the grinding wheel and the core portion 14 becomes extremely large, and the work load in the finishing step of the grindstone increases.

FIG. 3 shows the production of the vitrified grinding wheel 10.
The main part of the manufacturing process is shown. In the figure, grinding wheel raw material adjustment
In step 30, the raw material of the outer peripheral grinding stone portion 12, for example, silicon carbide
Substrate abrasive (SiC-based abrasive), fused alumina-based abrasive (A-based)
General abrasive grains such as abrasive grains) and silicon oxide (SiO_Two)
Silica powder, feldspar powder, viscous
Inorganic binder consisting of a mixture of soil, glass frit, etc.
(Vitrified bond) and enhances shape retention during molding
Dextrin to generate some mutual caking force for
Or other organic substances mixed as necessary with a binder such as
It is mixed with a pore forming agent such as an inorganic balloon in a predetermined weight ratio.
Are combined. For example, as the above abrasive grains,
6 weight per 94 parts by weight of A (white alundum)
Parts by weight of inorganic binder, 6 parts by weight of walnut powder, 2 parts by weight of dex
Water is mixed by well-known mixers. Continued whetstone
In the molding step 32, the mixed raw material is filled in a molding die.
Pressurized by a press machine at a relatively high pressure
As a result, an annular shape as shown in the outer grinding wheel portion 12 of FIG.
The molded product of
Dimension finishing is performed using a cutting tool etc. at the stage of formation
It is. In this dimension finishing work (process), raw
appear. Next, in the grinding stone part firing step 34, the ring
-Shaped molded body is heated to the melting temperature of inorganic binder in the kiln
The corresponding firing temperature, for example, about 900 ° C. or 13
Bonded by sintering at a firing temperature of about 00 ° C
The outer peripheral grindstone portion 12 having the vitrified grindstone structure is
Created. The chemical components of the inorganic binder are as follows.
For example, SiO_TwoIs 60%, Al_TwoO _ThreeIs 20%, Na_TwoO
_ThreeIs 5%, K_TwoO 5%, CaO 3%, MgO 2
%, B_TwoO_ThreeIs 5% and silicon oxide SiO_TwoThe main
Minutes.

In the hole finishing step 36, a grinding stone part firing step 34
The inner peripheral surface 18 of the outer grindstone portion 12 is dressed with a dressing tool so that the diameter and the inclination angle θ of the tapered inner peripheral surface 18 of the outer grindstone portion 12 sintered through the process are within a predetermined tolerance. The inner peripheral surface 18 having a tapered surface shape is finished to a preset diameter dimension and taper angle by being removed by a predetermined depth using a cutting tool or a cutting tool.

In the crushing and pulverizing and classifying step 40, crushes, which are chips and are discharged and collected in a raw finishing step performed to adjust the shape of a press-formed product before the grinding stone firing step, are collected. By pulverizing and classifying the powder, powdery powder having a predetermined particle size, for example, 120, 100, or 80 can be obtained. The raw finishing operation before firing is particularly frequently used in the production of a specially-shaped deformed whetstone, and the wedges discharged by the raw finishing have a weight ratio of, for example, 100 parts of an abrasive component,
It contains 7 parts of an inorganic binder (vitrified bond) and 2 parts of dextrin.

In the core part raw material adjusting step 42, a core part raw material for producing the core part 14, for example, an abrasive containing the same type of abrasive and the inorganic binder as the abrasive contained in the outer peripheral grinding stone part 12, for example, an outer peripheral part If the abrasive of the grindstone portion 12 is of an alundum type, the abrasive material is an alundum-based abrasive and the outer peripheral grindstone portion 1
If the inorganic binder of No. 2 has a coefficient of thermal expansion matched to that of an alundum-based abrasive, the raw binder containing the inorganic binder for the alundum-based abrasive and silicon oxide (SiO ₂ ) as main components An inorganic binder made of a mixture of silica stone powder, feldspar powder, clay and the like for forming a vitreous material and having the same coefficient of thermal expansion and fire resistance as the inorganic binder contained in the above-mentioned kude. A binder such as dextrin (dex water) for generating a certain degree of mutual caking force and a pore-forming agent such as walnut powder and inorganic balloons that are mixed as necessary are used in the above-mentioned grinding wheel material adjustment. Mixing as in step 30. At this time, since the binder already contains the inorganic binder, the amount of the inorganic binder is about 15 parts by weight. Agent will be included.

Also, WA (white alundum), PA
A vitrified grindstone structure in which alundum (fused alumina) -based abrasive grains such as (pink alundum) and A (alundum) are bonded by an inorganic binder has a thermal expansion coefficient of about 8 × 10 ^−6. Since the vitrified grindstone structure in which C (carborundum) -based abrasive grains such as SiC are bonded by an inorganic binder has a coefficient of thermal expansion of about 4 to 4.5 × 10 ⁻⁶ , the above-mentioned core part raw material adjustment The raw nut used in the step 42 includes an abrasive material of the same system as the abrasive material of the outer peripheral grindstone portion 12, and the inorganic binder added to the raw urine is such that the core portion 14 has an outer peripheral grindstone portion. While it is prepared so as to have the same coefficient of thermal expansion as that of No. 12, it is preferable to use one having a similar degree of fire and coefficient of thermal expansion as the inorganic binder in the vine, It would be better if there was. Normally, the inorganic binder in the spine is formulated to have a coefficient of thermal expansion substantially similar to that of the abrasive contained therein.

In the following core part forming step 44, similarly to the grinding stone forming step 32, the core part raw material adjusting step 42 is performed.
In the state where the core material mixed in the above is filled in a molding die, the material is pressed at a relatively high pressure by a press machine, so that an annular molded body as shown in the core part 14 of FIG. 1 or FIG. Is obtained. Next, in the core part firing step 46, similarly to the whetstone part firing step 34, the annular molded body is fired in a firing kiln at a firing temperature corresponding to the fire resistance of the inorganic binder contained in the core part raw material, for example, 13 ° C.
Sintering is performed at a sintering temperature of about 00 ° C. to form a core portion 14 having a vitrified grindstone structure. Then, in the core part finishing step 48, the diameter and the taper angle θ of the tapered outer peripheral surface 20 of the core part 14 sintered through the core part firing step 46 are set to be within a preset tolerance. Using the same method as in the finishing step 52, that is, using a dressing tool or a cutting tool, a predetermined depth is deleted.

In the bonding step 50, the outer peripheral grindstone 12 finished in the hole finishing step 36 and the core part 14 finished in the core part finishing step 48 are placed on a horizontal base 54 as shown in FIG. The peripheral surface 18 and the outer peripheral surface 20 are bonded to each other via an adhesive layer 22 made of epoxy resin. After the adhesive layer 22 is cured, in the finishing step 52, the surface of the vitrified grindstone 10 is removed by a depth of about 1 to 2 mm using a dressing tool or a cutting tool, so that the outside of the vitrified grindstone 10 is removed. The vitrified grindstone 10 shown in FIG. 1 is obtained by performing a surface finish for adjusting the diameter, roundness, thickness, and the like.

Through the above steps, for example, an inorganic binder is added to the outer peripheral grindstone portion 12 using WA (white alundum) abrasive particles and 100 Core part (outer diameter 400 mmφ) 14 which was mixed with 8 parts and 2 parts of water and mixed, fired and formed, having an outer diameter of 610 mmφ × 32 mmt × inner diameter of 304.8.
When the vitrified grindstone 10 of mmφ is manufactured, its composition and strength are obtained, for example, as shown in FIG. 4, and its fracture rotational strength is obtained, for example, as shown in FIG. The comparative example in FIG. 5 is a vitrified grindstone having the same dimensions as the vitrified grindstone structure similar to that of the outer peripheral grindstone portion 12 in which the WA is used. The vitrified grindstone 10 manufactured by the process of the present embodiment corresponds to the sample 4 in FIG. 6, and as shown in FIG. 4, is bent three times or more with respect to the comparative example (the same structure as the outer grindstone portion). The strength (50 MPa) was obtained, and the breaking rotation speed was increased by 14% or more as shown in FIG. In addition, since Kude, which is industrial waste, is used as the core material, industrial waste is reused, and there is an advantage that it can contribute to environmental conservation.

FIG. 6 shows the results of experiments on various samples in which the material of the abrasive and the amount of the inorganic binder added were changed when the above process was used. Here, as a value for obtaining the above-described effects of the present invention, the bending strength (flexural strength) of the core portion 14 needs to be 15 MPa or more, and these values are reference values. In the preparation of the core part raw material, Samples 5, 11, and 13 in which the inorganic binder was not added to the tree had bending strengths exceeding the above-mentioned reference values, but not so large values. In addition, although the bending strength exceeding the above-mentioned reference value was obtained in Sample 1 having a grain size of No. 46, the value was not so large. On the other hand, as shown in Samples 5 to 13, if
The flexural strength increases as the amount (% by weight) of the inorganic binder increases, and decreases when the amount exceeds 20%. Thereby, a preferable bending strength is obtained when the added amount of the inorganic binder is 2 to 30%, and a more preferable bending strength is obtained when the added amount is 10 to 20%. Further, as shown in Samples 1 to 3, if the same amount of the inorganic binder is used, the grain size of
The preferred bending strength is obtained from No. 6 to No. 120, and the most preferable bending strength is obtained particularly in the range of No. 80 to No. 120.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above-described embodiment, the core portion 14 fixed to the inner peripheral side of the annular outer peripheral grindstone portion 12 has a disk shape, but may have a polygonal shape.

In the above-described embodiment, the vitrified grindstone manufactured by the process shown in FIG. 3 is not limited to the disc-shaped grindstone shown in the vitrified grindstone 10 shown in FIG. Alternatively, a block-shaped vitrified grindstone 64 may be used.
In FIG. 7, a grindstone portion 66 made of a vitrified grindstone structure and a support portion 68 made of an inorganic material having the same vitrified grindstone structure as that of the grindstone portion 66 but further added with an inorganic binder are adhered to each other by an adhesive. ing.

In the above-described embodiment, the step of grinding and classifying the raw maple may not be necessarily provided, and instead, the raw and ground raw maple may be prepared. A step, that is, a step of purchasing the crushed and classified raw maple may be provided.

In the above-mentioned core part raw material adjusting step 42, the raw and crushed and crushed raw stones are used as grinding stone waste. However, the crushed and crushed grinding stone waste may be crushed and classified. Absent. In this case, instead of the crushing and pulverizing classifying step 40, a finishing powder (fan powder) purified from the baked grindstone, a vitrified grindstone that has been used and has a small diameter or a vitrified grindstone that has failed, or a finish A step of pulverizing and classifying burned grinding stone waste such as finishing powder (fan powder) discharged as shavings in step 52 is provided. In this case, a predetermined grain size, for example, No. 80, is obtained by fixing a vitreous material containing silicon oxide (SiO ₂ ) as a main component on the surface of abrasive grains such as silicon carbide (SiC) or fused alumina (Al ₂ O ₃ ). 100
No. 120 granules (aggregates) are obtained.

The above description is merely an embodiment of the present invention, and the present invention can be variously modified without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vitrified grindstone made from a grindstone waste produced by a production method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating an adhesive configuration of the vitrified grinding wheel of FIG.

FIG. 3 is a process diagram illustrating a main part of a method of manufacturing the vitrified grinding wheel of the embodiment in FIG. 1;

FIG. 4 is a view showing a configuration and a bending strength of a vitrified grinding wheel manufactured by the manufacturing method of FIG. 3;

FIG. 5 is a view showing the breaking rotational strength of a vitrified grinding wheel manufactured by the manufacturing method of FIG. 3;

FIG. 6 is a view showing experimental results when various samples are manufactured by the manufacturing method of FIG. 3;

FIG. 7 is a view showing another shape of the vitrified grindstone manufactured by the manufacturing method of FIG. 3;

[Explanation of symbols]

10: vitrified grinding wheel (vitrified grinding wheel) 12: outer peripheral grinding wheel portion (grinding wheel portion) 14: core portion (supporting portion) 42: core material adjusting process (adjusting process) 44: core portion forming process, 46: core portion firing process ( Forming and firing step) 50: Bonding step 64: Vitrified whetstone 66: Whetstone part 68: Support part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-138150 (JP, A) JP-A-8-318469 (JP, A) JP-A-8-252771 (JP, A) 772 (JP, A) JP-A-11-188638 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24D 3/00 310 B24D 3/00 340 B24D 3/14

Claims (7)

(57) [Claims] 1. A grinding wheel part comprising a vitrified grinding stone structure in which abrasive grains are bonded by an inorganic binder, and a supporting part made of an inorganic material exclusively for supporting the grinding stone part, wherein the grinding stone waste is used as a raw material. A method of manufacturing a vitrified whetstone, comprising the steps of:
Shavings generated from the dimensional finishing process of fired products, or discarded
For 100% of the whetstone waste, which is a whetstone,
Adjusting the material of the support portion made of the inorganic material by further adding and mixing 2 to 30 parts by weight of an inorganic binder; and adjusting the material of the support portion adjusted by the adjustment process to a predetermined shape. Forming and baking to form a support member made of an inorganic material having a predetermined shape; and bonding the support portion made of the inorganic material formed by the forming and baking process and the grinding wheel portion to each other. A method for producing a vitrified whetstone using whetstone waste as a raw material, comprising a bonding step of integrating. 2. The method according to claim 1, wherein the grain size of at least half of the abrasives contained in the support portion is substantially the same as or smaller than the grain size of the abrasives contained in the grindstone portion. A method for producing a vitrified whetstone using the whetstone waste as a raw material. 3. The grindstone waste according to claim 1 or 2 , wherein the grindstone portion and the support portion are bonded to each other with an epoxy resin-based or phenolic resin-based thermosetting resin adhesive. Manufacturing method of vitrified whetstone. 4. The whetstone portion is formed in an annular shape,
The forming and firing step is to create a disk-shaped inorganic material support having an outer diameter similar to the inner diameter of the whetstone part,
In the bonding step, the vitrified grinding wheel is integrated by bonding the outer peripheral surface of the support portion and the inner peripheral surface of the outer peripheral grinding stone portion formed by the molding and firing step to each other by bonding with a thermosetting resin adhesive. A method for producing a vitrified grinding wheel using the grinding stone waste as a raw material according to any one of claims 1 to 3 , which forms a wheel. 5. An inner peripheral surface of the annular grindstone portion and an outer peripheral surface of the disk-shaped inorganic material supporting portion are formed with a tapered surface inclined at the same angle with respect to an axis. 5. The vitrified grinding wheel made of grinding wheel waste as a raw material according to claim 4 , wherein the bonding step bonds the inner peripheral surface of the annular grinding wheel portion and the outer peripheral surface of the disk-shaped inorganic material supporting portion to each other. Manufacturing method. Wherein said tapered surface is vitrified abrasive method for producing a raw material grinding wastes according to claim 5 in which inclined by 1 to 3 degrees relative to the axis. 7. The grinding stone waste according to claim 6 , wherein the bonding step comprises bonding the outer peripheral surface of the support portion and the inner peripheral surface of the outer peripheral grinding stone portion to a thickness of 0.2 to 0.6 mm. A method for producing a vitrified whetstone as a raw material.