EP1634678A1 - Meule vitrifiee et procede de fabrication associe - Google Patents

Meule vitrifiee et procede de fabrication associe Download PDF

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Publication number
EP1634678A1
EP1634678A1 EP04735340A EP04735340A EP1634678A1 EP 1634678 A1 EP1634678 A1 EP 1634678A1 EP 04735340 A EP04735340 A EP 04735340A EP 04735340 A EP04735340 A EP 04735340A EP 1634678 A1 EP1634678 A1 EP 1634678A1
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EP
European Patent Office
Prior art keywords
grinding wheel
grinding
vitrified
pore
abrasive grain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04735340A
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German (de)
English (en)
Other versions
EP1634678A4 (fr
Inventor
Takayuki Bosch Automotive Systems Corp. YUI
Osamu Bosch Automotive Systems Corp. KUBOTA
Hideo Bosch Automotive Systems Corp. FURUKAWA
Masatoshi Noritake Super Abras. Co Ltd KISHIMOTO
Naoyuki Noritake Bonded Abrasive Co. Ltd. UKAI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Noritake Co Ltd
Noritake Super Abrasive Co Ltd
Original Assignee
Bosch Corp
Noritake Co Ltd
Noritake Super Abrasive Co Ltd
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Publication date
Application filed by Bosch Corp, Noritake Co Ltd, Noritake Super Abrasive Co Ltd filed Critical Bosch Corp
Publication of EP1634678A1 publication Critical patent/EP1634678A1/fr
Publication of EP1634678A4 publication Critical patent/EP1634678A4/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
    • B24D3/18—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings for porous or cellular structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for

Definitions

  • the present invention relates to a vitrified grinding wheel in which abrasive grains are bonded with a vitrified binder, and a method of manufacturing the same. More particularly, the present invention relates to a vitrified grinding wheel yielding good processing precision and grinding precision when grinding small-diameter inner surfaces of ground products, and to a method of manufacturing the same.
  • vitrified grinding wheels Since the degree of binding and composition of vitrified grinding wheels are readily adjusted and they afford resistance to water, alkali, and oil, they are widely employed in grinding and polishing operations, including precision grinding.
  • Fig. 2 shows the relation between the effective cutting edge spacing of the grinding wheel and the chip pocket in internal grinding.
  • the method (Fig. 2 (B)) of increasing the abrasive grain diameter and increasing the size of the effective cutting edge spacing We and chip pocket P relative to the norm (Fig. 2(A)) is conceivable.
  • the processing precision surface roughness
  • the method of reducing the abrasive grain diameter and decreasing the size of the effective cutting edge spacing We and chip pocket P relative to the norm (Fig. 2(A)) is also conceivable (Fig. 2(C)).
  • the method of replacing a portion of the cBN abrasive grains with a hollow inorganic substance is also known (see Japanese Unexamined Patent Publication (KOKAI) Showa No. 62-251077).
  • a hollow inorganic substance is pulverized during grinding to form pores, which would be expected to produce an effect similar to that of chip pockets.
  • the degree of concentration is made about 100
  • dispersion of the abrasive grains deteriorates due to the decreased degree of concentration, making it difficult to obtain grinding wheels in which the abrasive grains are uniformly dispersed.
  • the vitrified binder that originally should have held the cBN abrasive grains ends up being trapped in the hollow inorganic substance.
  • the vitrified binder used to bind the hollow inorganic substance ends up remaining in the grinding wheel, resulting in a drawback in the form of impaired grinding.
  • pore-forming materials such as walnuts, wood chips and the like are known.
  • the pore-forming materials are incorporated into a molded product prior to calcination and burned out during calcination, yielding pores in the grinding wheel obtained after calcination.
  • the use of such a pore-forming material is desirable in that it does not have the drawbacks encountered when fillers such as a hollow inorganic material are incorporated into the grinding wheel and permits the achievement of a low degree of concentration.
  • the present invention was devised to solve the above-described problems of prior art, and it is an object of the present invention to provide a vitrified grinding wheel in which a prescribed porosity is maintained and the pores and abrasive grains are uniformly disposed even when small-diameter abrasive grains are employed.
  • An another object of the present invention is to provide a method of manufacturing vitrified grinding wheels capable of maintaining a prescribed porosity in the grinding wheel and achieving uniform dispersion of abrasive grains and pores in the grinding wheel even when small-diameter abrasive grains are employed.
  • the present inventors conducted extensive research into the relation between the effective cutting edge spacing of abrasive grains and chip pocket volume for the purpose of achieving both processing efficiency and processing precision of grinding to solve the above-stated problems. As a result, they discovered that presetting the processing efficiency and processing precision of grinding and then setting the porosity, degree of concentration of abrasive grains, and abrasive grain diameter based on the preset processing efficiency and processing precision of grinding resulted in a method permitting improvement in both grinding efficiency and processing surface roughness; the present invention has been devised on this basis.
  • the object of the present invention is achieved by the following vitrified grinding wheel;
  • the processing efficiency and processing precision of grinding are preset.
  • the present invention can provide both a vitrified grinding wheel having a porosity, degree of concentration of abrasive grains, and abrasive grain diameter based on the aforementioned processing efficiency and processing precision of grinding, and a method of manufacturing the same.
  • the present invention can provide a grinding wheel having good processing precision of less than or equal to 1.0 Rz ( ⁇ m) even at a processing efficiency of grinding of greater than or equal to 0.3 mm 3 /(mm • sec).
  • the present invention can provide a grinding wheel in which abrasive grains and pores are uniformly dispersed and the degree of concentration is maintained at 50 to 160 with a porosity of 30 to 70 volume percent by containing a forced porosity of 5 to 35 volume percent based on burnout pores even when small-diameter abrasive grains having an average grain diameter of 10 to 90 ⁇ m are employed.
  • the present invention affords a uniform cutting edge spacing comparable to that of large-diameter abrasive grains even when employing small-diameter abrasive grains, and maintains the chip pocket volume.
  • it provides both a vitrified grinding wheel in which clogging tends not to occur during grinding, fusion is prevented, and both grinding processing efficiency and grinding processing precision are achieved, and a method of manufacturing the same.
  • the grinding wheel of the present invention has a porosity, a degree of concentration of abrasive grains, and an abrasive grain diameter based on the preset processing efficiency and processing precision of grinding.
  • the processing efficiency of grinding is given as the amount of grinding per second for a grinding wheel width of 1 mm and is normally denoted in units of mm 3 /(mm • sec).
  • the processing precision of grinding can be denoted as a surface roughness and is normally denoted as a ten-point average roughness Rz ( ⁇ m).
  • the conventional limit of processing efficiency of grinding is about 0.3 mm 3 /(mm • sec).
  • the grinding wheel of the present invention it is possible to achieve a processing efficiency of grinding of greater than or equal to 0.3 mm 3 /(mm • sec) even at a grinding precision of less than or equal to 1 Rz ( ⁇ m).
  • the processing precision of grinding is set to 0.1 to 1.6 Rz ( ⁇ m), preferably 0.2 to 1.0 Rz ( ⁇ m), and more preferably 0.3 to 0.5 Rz ( ⁇ m)
  • the processing efficiency of grinding can be set to 0.1 to 2.0 mm 3 /(mm • sec), preferably 0.2 to 1.0 mm 3 /(mm • sec), and more preferably 0.3 to 0.7 mm 3 /(mm • sec).
  • Fig. 5 the relation between the grinding efficiency ratio and the effective cutting edge spacing, We, is shown in Fig. 5 to describe the relation between the above-mentioned processing efficiency of grinding and the effective cutting edge spacing, We.
  • the grinding efficiency ratio is less than 2.
  • the grinding wheel of the present invention has an effective cutting edge spacing of 0.1 mm, it is possible to make the grinding efficiency ratio greater than or equal to 2 (preferably greater than or equal to 2.5, and more preferably greater than or equal to 3.0).
  • the grinding efficiency ratio is greater than or equal to 3 when the effective cutting edge spacing is 0.1 mm.
  • abrasive grains of prescribed size preferably 10 to 90 ⁇ m
  • the abrasive grains are not positioned next to one another in the manner of a conventional grinding wheel (see Fig. 2), but are arranged uniformly as shown in Fig. 6, maintaining a certain effective cutting edge spacing.
  • the grinding wheel of the present invention achieves good processing efficiency (grinding efficiency ratio) while maintaining a prescribed processing precision of grinding.
  • the term "porosity” means the ratio of the volume of pores (space) without abrasive grains, binder, and other fillers and the like, to the volume of the whole grinding wheel.
  • the porosity is comprised of a forced porosity and a natural porosity.
  • the term "forced porosity” means the ratio of the volume of burnout pores --- formed by burning out a pore-forming material when a molded product containing at least an abrasive grain, a vitrified binder, and a pore-forming material is calcined in a calcination step - to the volume of whole pores.
  • natural porosity refers to the porosity calculated by subtracting the above forced porosity from the total porosity, and is the ratio occupied in the molded product of gap portions in the abrasive grain, vitrified binder, and pore-forming material prior to calcination.
  • the porosity suitably falls within a range of 30 to 70 volume percent, preferably 40 to 60 volume percent, and more preferably 45 to 55 volume percent, of the volume of the whole grinding wheel.
  • the porosity is greater than or equal to 30 volume percent, fusion is not caused due to inadequate volume of chip pockets and clogging during grinding. Since the pore-forming material is burned out during the calcination in the present invention, better porosity can be ensured than in grinding wheels in which a pore-forming material is not employed; porosities of up to 70 volume percent can be obtained.
  • the forced porosity suitably falls within a range of 5 to 35 volume percent, preferably 20 to 35 volume percent, and more preferably 25 to 35 volume percent, of the volume of the whole grinding wheel.
  • the forced pores formed by the pore-forming material primarily contribute to the improvement of the processing efficiency of grinding.
  • the forced porosity is greater than or equal to 5 volume percent, grinding can be carried out well.
  • the forced porosity is less than or equal to 35 volume percent, grinding wheels can be manufactured stably.
  • the size of the forced pores formed by burning out the pore-forming material greatly affects grinding wheel performance.
  • the smaller the forced pores the greater the dispersion of abrasive grains and pores in the grinding wheel. Since increasing dispersion of the abrasive grains and the pores stabilizes the cutting edge spacing, the chip discharge performance increases and power consumption during grinding decreases, which are advantageous with regard to production efficiency. Further, since the strength of the grinding wheel increases, abrasion of the grinding wheel due to grinding decreases, resulting in good durability.
  • the vitrified grinding wheel of the present invention can be one comprising pores (including both forced pores and natural pores) having a size 1 to 3 times the average grain diameter of the abrasive grains in a ratio of 20 to 70 volume percent, preferably 30 to 60 volume percent, and more preferably 30 to 50 volume percent, with respect to the volume of whole pores.
  • the vitrified grinding wheel of the present invention can be one comprising pores having a size 0.1 to 1 time the average grain diameter of the abrasive grains in a ratio of 30 to 70 volume percent, preferably 40 to 70 volume percent, and more preferably 50 to 70 volume percent, with respect to the volume of whole pores.
  • the ratio of pores having a desired size can be adjusted by suitably setting the size and quantity added of the pore-forming material employed.
  • the ratio of pores having a desired size can be calculated by slicing the grinding wheel, measuring the cross-section with a microscope capable of three-dimensional measurement to obtain three-dimensional data, and then analyzing the cross-sectional shape.
  • the pore-forming material employed in the present invention is not specifically limited, other than that it be a material that can be burned out in calcination. It is preferable to use a pore-forming material having a burnout starting temperature greater than or equal to the transition temperature of the vitrified binder described further below, and having a burnout ending temperature lower than the maximum temperature within the calcination temperature range of the vitrified binder.
  • a pore-forming material having a burnout starting temperature at least 5°C (more preferably at least 10°C, and further preferably at least 20°C) greater than the transition temperature of the vitrified binder, and having a burnout ending temperature at least 5°C (more preferably at least 10°C, and further preferably at least 20°C) lower than the maximum temperature within the calcinations temperature range of the grinding wheel starting materials including the vitrified binder.
  • the pore-forming material desirably has a strength so as to preclude pulverization during stirring of the manufacturing starting materials in the process of manufacturing the grinding wheel. Any pore-forming material having a strength so as to preclude pulverization during stirring may be employed, whether it be solid or hollow.
  • the specific gravity of the pore-forming material is desirably greater than or equal to 1 (for example, 1 to 2.5, preferably 1 to 1.5). When the specific gravity of the pore-forming material is greater than or equal to 1, it does not float on the starting materials during stirring and can be uniformly dispersed in the starting materials.
  • the size of the pore-forming material is preferably selected according to the size of the desired forced pores. As set forth above, the smaller the forced pores, the lower the power consumption during grinding and the greater the advantage afforded in the form of production efficiency. Further, the smaller the forced pores, the greater the strength of the grinding wheel and the less the abrasion of the grinding wheel during grinding, resulting in good durability. However, when the forced pore diameter becomes excessively small, the processing efficiency during grinding drops. From the above perspectives, the size of the pore-forming material is suitable from 0.1 to 3 times the average grain diameter of the abrasive grains.
  • the size of the pore-forming material is preferably from 0.16 to 1 time the average grain diameter of the abrasive grains.
  • a pore-forming material about 3.5 to 36 ⁇ m in size can be employed.
  • the shape of the pore-forming material is not specifically limited. However, an abrasive grain having a true spherical shape that can be dispersed well during the manufacturing process is preferred.
  • the content, as volume percentage, of the pore-forming material in the starting materials is preferably 10 to 50 percent, more preferably 15 to 45 percent, and further preferably 15 to 40 percent.
  • the volume percentage is greater than or equal to 10 percent, an effect by the formation of burnout pores can be achieved.
  • the volume percentage is less than or equal to 50 percent, a grinding wheel of suitable strength and durability can be manufactured.
  • pore-forming materials are: polymer compounds such as polymethyl acrylate and polymethyl methacrylate, and carbonaceous compounds containing 90 mass percent or more of carbon.
  • polymer compounds such as polymethyl acrylate and polymethyl methacrylate
  • carbonaceous compounds containing 90 mass percent or more of carbon are preferred.
  • the grain diameter of the abrasive grain employed in the present invention can be suitably determined in view of the relation between the porosity and the degree of concentration based on the above-described processing efficiency and processing precision of grinding.
  • abrasive grains having an average grain diameter ranging from 10 to 90 ⁇ m, preferably 18 to 60 ⁇ m, more preferably 20 to 55 ⁇ m, and most preferably 25 to 45 ⁇ m.
  • abrasive grains having an average grain diameter of greater than or equal to 10 ⁇ m there is no problem with adhesion between abrasive grains and processing efficiency of grinding does not drop sharply.
  • abrasive grains having an average grain diameter of less than or equal to 90 ⁇ m a prescribed cutting edge spacing can be maintained and processing precision can be improved.
  • abrasive grain is not specifically limited other than that the average grain diameter falls within the above-stated range.
  • cBN abrasive grains A-based (alumina-based), and C-based (silicon carbide-based) abrasive grains can be employed.
  • cBN abrasive grains are preferably employed.
  • One type of abrasive grain may be employed alone, or two or more types may be mixed for use.
  • cBN abrasive grains When employing cBN abrasive grains as an abrasive grain, one or more types of common abrasive grains and hollow inorganic materials may be employed as a filler as needed. However, in that case, the quantity of filler employed is suitably adjusted so that the degree of concentration of the cBN abrasive grains ranges from 50 to 160.
  • the degree of concentration of the abrasive grains is suitably from 50 to 160, preferably from 75 to 150, and more preferably from 100 to 125.
  • the term "degree of concentration” means the ratio of abrasive grains in the grinding wheel.
  • 4.4 ct/cm 3 is the degree of concentration of 100 corresponding to 25 volume percent.
  • the degree of concentration of 200 corresponds to 50 volume percent.
  • the degree of concentration of 100 corresponds to about 25 volume percent and the degree of concentration of 200 to about 50 volume percent.
  • the degree of concentration is adjusted within a relatively low range of 50 to 160 as well as the porosity is adjusted within a range of 30 to 70 volume percent, as mentioned above, to maintain or increase a prescribed chip pocket volume and prevent clogging and fusion of the grinding wheel during high-efficiency grinding.
  • the vitrified binder can be suitably selected based on the type of abrasive grain.
  • the vitrified binder can be, for example, borosilicate glass or crystallized glass.
  • crystallized glass is one from which willemite has been precipitated.
  • the coefficient of thermal expansion of the vitrified binder desirably falls within a range of ⁇ 2 x 10 -6 (1/K) (room temperature to 500°C) with respect to the coefficient of thermal expansion of the abrasive grains.
  • the temperature for calcining grinding wheel starting materials containing binder is selected based on the type of the vitrified binder for superabrasive grains employed. Since the transition temperature of the vitrified binder for superabrasive grains is lower than the transition temperature of vitrified binders for common abrasive grains, the temperature of calcining grinding wheel starting materials containing vitrified binder for superabrasive grains preferably falls within a range of 650 to 1,000°C, more preferably within a range of 700 to 950°C. At greater than or equal to 650°C, a grinding wheel having a certain strength even after calcination is obtained. At less than or equal to 1,000°C, the superabrasive grains do not deteriorate.
  • An example of a preferred composition of the vitrified binder for superabrasive grains is SiO 2 : 40 to 70 mass percent, Al 2 O 3 : 10 to 20 mass percent, B 2 O 3 : 10 to 20 mass percent, M 1 O: 2 to 10 mass percent, and M 2 2 O: 2 to 10 weight percent.
  • M 1 denotes one or more metals selected from alkaline earth metals
  • M 2 denotes one or more metals selected from alkali metals.
  • the content of vitrified binder can be suitably selected.
  • the content thereof may fall within a range of 13 to 35 volume percent, preferably within a range of 18 to 22 volume percent, with respect to the volume of the starting materials.
  • the vitrified grinding wheel of the present invention includes, for example, those in which a vitrified grinding wheel portion containing abrasive grains and vitrified binder is provided on a support surface made of ceramic not containing abrasive grains.
  • the grinding wheel of the present invention is a vitrified superabrasive grain grinding wheel
  • the additives normally employed in vitrified superabrasive grain grinding wheels such as embrittling agents and solid lubricants, can be incorporated in suitable quantity as desired.
  • the manufacturing method of the present invention comprises steps of setting a processing efficiency and a processing precision of grinding, and setting a porosity, a degree of concentration of abrasive grains and an abrasive grain diameter based on the processing efficiency and processing precision.
  • processing efficiency and processing precision of grinding, porosity, degree of concentration of abrasive grains, and abrasive grain diameter those regarding the above-described vitrified grinding wheel may be employed without alteration.
  • the abrasive grains, vitrified binder, and pore-forming material employed in the vitrified grinding wheel of the present invention set forth above may be suitably employed as the abrasive grains, vitrified binder, and pore-forming material in the manufacturing method of the present invention.
  • the manufacturing method of the present invention may comprise a calcinations step in which a molded product containing at least an abrasive grain, vitrified binder, and a pore-forming material is calcined to burn out the pore-forming material.
  • the method of calcining a molded product containing at least an abrasive grain, vitrified binder, and a pore-forming material is preferably one in which the molded product is calcined by maintaining it at a certain temperature for a certain period to burn out the pore-forming material.
  • Such a method is preferable in that the pore-forming material burns out before the vitrified binder melts in the calcination step, preventing calcination shrinkage and disruption of the abrasive grain distribution caused by the binder and abrasive grains moving about freely.
  • the period of maintaining mentioned above is preferably long enough for the aforementioned pore-forming material contained in the molded product to burn out.
  • a period adequate for the pore-forming material to burn out can be suitably set based on the shape and dimensions of the grinding wheel being manufactured.
  • the aforementioned molded product When maintaining the aforementioned molded product at the calcination temperature of the vitrified binder, it is maintained at a certain temperature falling within the range of the calcination temperature. So long as the temperature remains within this calcination temperature range, variation in the temperature (for example, a rise in temperature over time) is permissible.
  • the temperature that is maintained for a certain period during calcination is preferably greater than or equal to the burnout ending temperature of the pore-forming material (preferably a temperature at least 5°C greater than the burnout ending temperature, more preferably a temperature at least 10°C greater than the burnout ending temperature).
  • the temperature of calcining the molded product can be a temperature within the calcination temperature range of the vitrified binder as well as higher than or equal to the burnout ending temperature of the pore-forming material.
  • the dimension of the molded product in the course of calcining the molded product is preferably a dimension so as to permit adequate burnout of the pore-forming material employed.
  • the thickness can be set to less than or equal to 10 mm (preferably less than or equal to 5 mm, more preferably less than or equal to 3 mm).
  • the edge thickness (the thickness of the cylinder wall) can be made less than or equal to 10 mm (preferably less than or equal to 5 mm, more preferably less than or equal to 3 mm).
  • the atmosphere during calcination is one in which the pore-forming material burns adequately.
  • the pore-forming material is carbonaceous, an atmosphere containing oxygen can be employed, with air normally being adequate.
  • the step yielding the molded product can be inserted before the calcination step.
  • the molded product is preferably obtained by mixing and stirring starting materials comprising at least abrasive grains, a vitrified binder powder, and a pore-forming material with a primary binder such as an adhesive paste to obtain a mixture in which each of the components has been uniformly dispersed, and molding this mixture by pressing and drying.
  • vitrified superabrasive grain grinding wheel When manufacturing a vitrified superabrasive grain grinding wheel, desired additives such as embrittling agents, solid lubricants, and molding adjuvants that are commonly employed in vitrified superabrasive grain grinding wheels may be incorporated into the above starting materials in suitable quantity.
  • the vitrified grinding wheel obtained by the above manufacturing method can be employed as a grinding wheel in various grinding devices. Even when the diameter of the object being ground is small, high processing efficiency and processing precision of grinding are achieved. Thus, it is suited to use in internal grinding. Examples of applications of the grinding wheel of the present invention include grinding of the inner surfaces and sheet surfaces of the injection nozzles of fuel injection devices and pressure regulators, and internal grinding of the inner and outer wheels of bearings.
  • Example 1 Starting materials of the following blend shown in Examples 1 to 3 and Comparative Examples 1 and 2were press molded and calcined in air for 24 hours at 900°C (during which they were maintained at 900°C for one hour) to obtain vitrified grinding wheels.
  • Example 1 when the decrease in mass was measured under the condition of raising a temperature of 10°C/min, the burnout starting temperature (a reduction of 10 mass percent) of polymethyl methacrylate was found to be 300°C and the burnout ending temperature (a reduction of 90 mass percent) was found to be 500°C.
  • the transition temperature of the vitrified binder employed was 550°C and the specific calcination temperature was 850 to 950°C.
  • Figs. 1, 3 and 4 are enlarged schematic cross-sectional views of the structures of the grinding wheels of Example 1 and Comparative Examples 1 and 2 obtained after calcination.
  • the grinding wheel of the present invention is a grinding wheel in which cBN abrasive grains 1 are bonded by vitrified binder 3, and burnout pores (forced pores) 2 and natural pores 4 are present.
  • the grinding wheel of Comparative Example 1 is a grinding wheel in which cBN abrasive grains 21 and burnout pores 22 are bonded by vitrified binder 23, and pores 24 are present.
  • the grinding wheel of Comparative Example 2 is a grinding wheel in which cBN abrasive grains 31 are bonded by vitrified binder 32, and pores 33 are present.
  • the grinding wheel of Example 1 shown in Fig. 1 has more uniformly dispersed abrasive grains and pores and greater porosity than the grinding wheels of Comparative Examples 1 and 2.
  • the grinding wheel of Comparative Example 1 shown in Fig. 3 despite having good porosity, has nonuniformly dispersed abrasive grains.
  • the grinding wheel of Comparative Example 2 shown in Fig. 4 has nonuniform abrasive grains and low porosity. This reveals that the grinding wheel of the present invention is a grinding wheel having good chip pocket size while maintaining a certain effective cutting edge spacing.
  • Example 1 and Comparative Examples 1 and 2 were used to conduct internal grinding and the relation between grinding efficiency ratio and the size of the effective cutting edge spacing was examined.
  • Fig. 7 gives the results.
  • the ground objects, the processing conditions, and the dressing conditions are given below.
  • ⁇ Processing condition> Machine employed Grinder for internal grinding Grinding type Wet oscillation grinding Peripheral speed of grinding wheel 22.6 m/s Peripheral speed of ground object 0.5 m/s Grinding efficiency ratio 1-3.2 Oscillation Done Grinding oil
  • Oil-based ⁇ Dressing condition > Dresser ⁇ 50 square column rotary Dress depth of cut ⁇ 1 ⁇ m/pass Lead 0.004 mm/rev
  • ground objects The ground objects, the processing conditions, and the dressing conditions are given below.
  • ⁇ Ground object Material SUJ-2 Dimension Internal diameter ⁇ 28.3 mm Grinding allowance ⁇ 0.36 mm
  • ⁇ Processing condition Machine employed Grinder for internal grinding Grinding type Wet oscillation grinding Peripheral speed of grinding wheel 45 m/s Peripheral speed of ground object 1.25 m/s Oscillation Done Grinding oil Water-soluble ⁇ Dressing condition> Dresser ⁇ 25 square column rotary Dress depth of cut ⁇ 4 ⁇ m/pass Lead 0.030 mm/rev
  • the vitrified grinding wheel of the present invention has a porosity, degree of concentration of abrasive grains, and abrasive grain diameter that are based on preset processing efficiency and processing precision of grinding.
  • the grinding wheel of the present invention affords precision processing of roughness of surfaces being processed while improving processing efficiency of grinding, formerly considered to be contradicting indicators of grinding wheels.
  • the processing efficiency and processing precision of grinding are preset. Based on the processing efficiency and processing precision of grinding, the porosity, degree of concentration of abrasive grains, and abrasive grain diameter are set.
  • the method of manufacturing of the present invention permits uniform distribution of abrasive grains and pores within the grinding wheel, thereby permitting the manufacturing of grinding wheels affording both processing efficiency and processing precision of grinding.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP04735340A 2003-05-30 2004-05-28 Meule vitrifiee et procede de fabrication associe Withdrawn EP1634678A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003155149 2003-05-30
PCT/JP2004/007754 WO2004106001A1 (fr) 2003-05-30 2004-05-28 Meule vitrifiee et procede de fabrication associe

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EP1634678A1 true EP1634678A1 (fr) 2006-03-15
EP1634678A4 EP1634678A4 (fr) 2007-05-30

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US (1) US20060137256A1 (fr)
EP (1) EP1634678A4 (fr)
JP (1) JPWO2004106001A1 (fr)
KR (1) KR100881254B1 (fr)
CN (1) CN1795078A (fr)
BR (1) BRPI0411190A (fr)
WO (1) WO2004106001A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011056680A2 (fr) 2009-10-27 2011-05-12 Saint-Gobain Abrasives, Inc. Abrasif lié vitreux
US11673231B2 (en) * 2017-10-11 2023-06-13 A.L.M.T. Corp. Vitrified bond super-abrasive grinding wheel

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Publication number Priority date Publication date Assignee Title
JP4953361B2 (ja) * 2006-11-30 2012-06-13 セイコーインスツル株式会社 軸付き砥石および研削盤ならびに燃料噴射ノズルの製造方法
JP5398132B2 (ja) * 2007-09-28 2014-01-29 豊田バンモップス株式会社 研削砥石
US7815338B2 (en) * 2008-03-02 2010-10-19 Altair Engineering, Inc. LED lighting unit including elongated heat sink and elongated lens
KR20110019427A (ko) * 2008-06-23 2011-02-25 생-고뱅 어브레이시브즈, 인코포레이티드 고공극율 유리질 초연마 제품들 및 그 제조 방법
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BRPI0411190A (pt) 2006-07-25
US20060137256A1 (en) 2006-06-29
JPWO2004106001A1 (ja) 2006-07-20
WO2004106001A1 (fr) 2004-12-09
CN1795078A (zh) 2006-06-28
EP1634678A4 (fr) 2007-05-30
KR100881254B1 (ko) 2009-02-05

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