WO2010013580A1 - ビトリファイド砥石 - Google Patents
ビトリファイド砥石 Download PDFInfo
- Publication number
- WO2010013580A1 WO2010013580A1 PCT/JP2009/062156 JP2009062156W WO2010013580A1 WO 2010013580 A1 WO2010013580 A1 WO 2010013580A1 JP 2009062156 W JP2009062156 W JP 2009062156W WO 2010013580 A1 WO2010013580 A1 WO 2010013580A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grinding
- vitrified
- grindstone
- abrasive grains
- microcapsule
- Prior art date
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with cooling provisions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249954—With chemically effective material or specified gas other than air, N, or carbon dioxide in void-containing component
Definitions
- the present invention relates to a vitrified grindstone having abrasive grains, an inorganic binder for bonding the abrasive grains, and a continuous air hole formed between the abrasive grains and the inorganic binder.
- a porous vitrified grindstone in which abrasive grains such as CBN abrasive grains, diamond abrasive grains, and general abrasive grains are bonded with a vitreous inorganic binder is known.
- Such vitrified grindstones are formed, for example, as arc-shaped grindstone pieces, which are adhered to the outer peripheral surface of a disk-shaped core such as a metal base metal or ceramic score made of an inorganic material such as a vitrified structure.
- a vitrified grinding wheel Used as a vitrified grinding wheel.
- Such a vitrified grindstone wheel has a high grinding ratio and a high grinding efficiency, and is suitably used when high-speed grinding of work materials such as metal parts and hardened steel materials.
- the vitrified superabrasive wheels described in Patent Documents 1 and 2 are examples thereof.
- the reason is that the bond exists on the surface of the grindstone after dressing on the same surface as the abrasive grains. After a plurality of grinding processes, the bond on the grindstone surface recedes from the abrasive grains and gradually becomes the original sharpness. . Therefore, immediately after dressing, grinding is performed with a low processing efficiency, that is, the cutting speed is set, or sharpening is performed in addition to dressing, which causes a decrease in productivity of grinding. It was.
- the grindstone is impregnated with a treatment agent such as sulfur or wax.
- a treatment agent such as sulfur or wax.
- Patent Documents 3 and 4 there has been proposed a grinding wheel in which microcapsules containing a grinding fluid (lubricant) and the like are dispersed in a metal plating phase together with superabrasive grains.
- the microcapsules are destroyed when exposed to the surface (grinding surface) of the dense metal plating phase to form chip pockets, enabling chips to be discharged and supplying the grinding fluid incidentally. Is.
- the grinding liquid generated depending on the shape of the work material is also supplied to the part that is difficult to be supplied from the outside. It does not cause a function to prevent grinding burn of the part.
- the present invention has been made against the background of the above circumstances, and the object of the present invention is that grinding burn of the work material does not occur in the grinding of the portion where the grinding liquid is difficult to enter between the work material and the grindstone.
- An object of the present invention is to provide a vitrified grindstone that does not degrade the grinding quality of the ground surface.
- the present inventors have partially included microcapsules containing lubricant for lubricating the abrasive grains in the continuous air holes of the vitrified grindstone after firing. If it is filled and fixed, the grinding burn is preferably prevented in a portion where it is difficult to supply the grinding fluid, such as a surface contact portion such as a stepped surface or end surface portion orthogonal to the rotation axis of the work material. We have found that stable grinding quality can be obtained for grinding materials. The present invention has been made based on this finding.
- the invention according to claim 1 for achieving the above object comprises: (a) abrasive grains, an inorganic binder that binds the abrasive grains, and a continuous vent formed between the abrasive grains and the inorganic binder.
- a vitrified grindstone having (b) a microcapsule containing a lubricant for lubricating the abrasive grains is fixed in a state of being partially filled in the continuous air hole.
- the microcapsules containing the lubricant for lubricating the abrasive grains are fixed in a state of being partially filled in the continuous vent holes of the vitrified grindstone, Grinding fluid supply function, chip pocket function for removing chips from grinding point, etc., original functions of the continuous air holes are not impaired, so high grinding ratio and high efficiency grinding can be obtained and exposed to the grinding surface at the same time Since the microcapsule is destroyed and the grinding fluid contained in it is released, the grinding fluid is difficult to be supplied, such as stepped surfaces and end surface portions that are perpendicular to the rotation axis of the work material. Grinding burn in is suitably prevented and stable grinding quality is obtained.
- the abrasive grains are diamond abrasive grains or CBN abrasive grains having an average particle diameter of 5 to 250 ⁇ m ⁇ , and the continuous air holes have an average inner diameter of 5 to 500 ⁇ m ⁇ ,
- the capsule has an average particle diameter of 1 to 200 ⁇ m ⁇ .
- the lubricant contained in the microcapsule is made of a grinding fluid. Since the higher the grinding fluid concentration, the better the lubricity, the grinding fluid stock solution is preferably used as the lubricant contained in the microcapsules. In this case, since higher lubrication performance is obtained, grinding burn is suitably prevented.
- the outer shell of the microcapsule is made of gelatin, melamine resin, phenol resin, or urea resin. Since the outer shell of the microcapsule is made of such an organic substance, the microcapsule is easily broken and has an advantage that the grinding performance is not affected.
- the vitrified grindstone is a plurality of grindstone pieces attached to the outer peripheral surface of a thick disc-shaped core of a superabrasive grindstone wheel.
- the vitrified grindstone may be an integrally formed grindstone.
- FIG. 2 is a schematic diagram for enlarging and explaining a grindstone structure of a vitrified grindstone piece (abrasive material layer) in the vitrified superabrasive grindstone wheel of FIG. 1. It is a figure explaining the structure of the microcapsule fixed in the state with which it filled with a part in the continuous ventilation hole formed in the said grindstone structure
- FIG. 6 is a process diagram illustrating a process of filling and fixing microcapsules in a predetermined ratio in the continuous air holes of a vitrified grindstone piece (abrasive material layer) in the vitrified superabrasive grindstone wheel of FIG. 5. It is process drawing explaining the process of producing the process liquid of FIG.
- FIGS. 8A and 8B are diagrams for explaining a mixing procedure of materials in the treatment liquid preparation step of FIG.
- a vitrified superabrasive wheel in a vitrified grindstone piece (abrasive layer), it is an electron micrograph showing the grindstone structure after microcapsules are filled in the continuous air holes, magnified 500 times.
- the consumption electrode value when performing grinding test 1 using a vitrified superabrasive grinding wheel in which microcapsules are not filled in the continuous air holes and a vitrified superabrasive wheel in which microcapsules are filled in the continuous air holes is shown.
- FIG. 1 Used in grinding test 2 in which camshaft grinding was performed using a vitrified superabrasive wheel with no microcapsules filled into the continuous air holes and a vitrified superabrasive wheel with microcapsules filled into the continuous air holes. It is a figure explaining the shape of the cut work material. It is a photograph which shows the generation
- FIG. 15 is a photograph showing a state in which grinding burns and corresponding cracks did not occur when the work material of FIG. 14 was ground using a vitrified superabrasive grindstone wheel filled with microcapsules in continuous air holes.
- FIG. 1 is a front view showing a vitrified superabrasive grinding wheel 10 manufactured by a manufacturing method according to an embodiment of the present invention.
- the vitrified superabrasive grinding wheel 10 has a disk shape made of metal such as carbon steel or aluminum alloy, and has a mounting hole 14 for mounting to a grinding device (for example, a cylindrical grinding machine 12 described later) at the center thereof.
- the size is appropriately set depending on the application, but the vitrified superabrasive grinding wheel 10 of the present embodiment is configured, for example, with an outer diameter D of 380 mm ⁇ and a thickness of about 10 mm excluding the mounting portion 16. is there.
- FIG. 2 is a perspective view showing the vitrified grindstone piece 26. 1 and 2
- a vitrified grindstone piece 26 is an underlayer formed by bonding general abrasive grains made of fused alumina, silicon carbide, or mullite with a vitreous inorganic binder (vitrified bond).
- 28 and an abrasive layer 30 in which superabrasive grains having a Knoop hardness of 3000 or more such as CBN abrasive grains and diamond abrasive grains are bonded with a glassy inorganic binder.
- the base layer 28 functions exclusively as a base for mechanically supporting the abrasive material layer 30, and the abrasive material layer 30 functions exclusively as a grindstone for grinding the work material.
- the superabrasive grains having a size within the range of 60 mesh [average particle size 250 ⁇ m] to 3000 mesh [average particle size 5 ⁇ m] are preferably used.
- FIG. 3 is an example of a cross-sectional configuration of the abrasive layer 30 of the vitrified grindstone piece 26, and an enlarged state of the bonding state between the vitrified bond 32 and the superabrasive grains 34 having an average grain diameter of, for example, 5 to 250 ⁇ m ⁇ will be described.
- It is a schematic diagram.
- a continuous air hole 36 having an average inner diameter of, for example, 5 to 500 ⁇ m ⁇ is formed between the vitrified bond 32 and the superabrasive grain 34, and a particle diameter sufficiently smaller than that is formed in the continuous air hole 36.
- a plurality of microcapsules 38 having the above are fixed by an adhesive (not shown) in a partially filled state.
- the microcapsule 38 has an average particle diameter of, for example, 1 to 200 ⁇ m ⁇ , and the original function of the continuous air holes 36 such as a function of supplying a grinding fluid and a chip pocket function of removing chips from a grinding point may be impaired. It is fixed so as to occupy a part of the space in the continuous vent hole 36 having an inner diameter sufficiently larger than the average particle diameter at a volume ratio of a certain degree.
- the microcapsule 38 exposed to the grinding surface 20 which is the surface of the abrasive material layer 30 is destroyed by the work material 40.
- the microcapsule 38 includes a lubricant 42 which is a stock solution of a grinding fluid and an outer skin 44 containing the lubricant.
- the outer skin 44 is easily broken when the microcapsule 38 is exposed to the grinding surface 20 and is made of any organic material such as gelatin, melamine resin, phenol resin, urea resin or the like so as not to affect the grinding performance.
- the lubricant 42 may be a chemical-etchable liquid such as an acidic liquid as necessary.
- FIGS. 5 to 8 are process diagrams for explaining a main part of the manufacturing method of the vitrified superabrasive grinding wheel 10.
- abrasive grains that are raw materials for the vitrified grinding stone piece 26 a vitreous inorganic binder (vitrified bond), and a certain amount of mutual caking force at the time of molding are generated.
- a binder amount of glue
- a pore forming agent such as an organic substance or an inorganic balloon
- the underlayer 28 is not necessarily formed, and the pore forming agent is not necessarily used.
- the raw materials having the ratios shown in Table 1 below are used for the abrasive layer 30 and the ratios shown in Table 2 below are used for the base layer 28.
- resin beads such as expanded polystyrene are used in addition to the above raw materials.
- the raw material for the abrasive layer 30 and the raw material for the base layer 28 mixed in the molding cavity of a predetermined molding die are sequentially filled and pressurized, as shown in FIG. A shaped molded body is formed.
- the molded body is fired, for example, at a temperature of 1000 ° C. or less for 5 hours, thereby producing a vitrified grindstone piece 26 having a length of 40 mm, a width of 10.4 mm, and a thickness of 7.4 mm, for example. .
- the vitrified grindstone piece 26 (abrasive material layer 30) is, for example, one in which CBN abrasive grains of # 80 are bonded by vitrified bonds with a concentration degree of 200 at a bonding degree M (CB80M200VN1).
- the vitrified grindstone piece 26 is adhering to the outer peripheral surface 24 of the base 18 prepared in advance using, for example, an epoxy resin adhesive without any gaps.
- the surface of the base metal 18 to which the vitrified grindstone piece 26 is attached that is, the surface of the vitrified superabrasive grindstone wheel 10 is set to a predetermined depth, for example, about 0.5 to 1 mm using a dressing tool or a cutting tool.
- the outer diameter dimension D of the vitrified superabrasive grinding wheel 10, the roundness of the outer diameter dimension D, the thickness dimension, and the like are adjusted.
- the microcapsule 38 is placed in the continuous vent hole 36 of the vitrified grinding stone piece 26 by, for example, the step shown in FIG. A portion is filled and fixed at a predetermined ratio.
- a resin adhesive made of a resol type resin such as a resin and dilution water
- a treatment liquid in which a large number of microcapsules 38 are dispersed in the liquid is created.
- this treatment liquid has the ratio shown in Table 3
- the skin 44 of the microcapsule 38 is made of melamine resin the ratio is shown in Table 4. is there.
- the ratio of water in the treatment liquid determines the volume ratio (filling ratio) with respect to the volume in the continuous vent 36 of the microcapsule 38.
- the volume ratio of the microcapsule 38 to the volume in the continuous vent 36 is about 10%.
- the microcapsule 38 is microscopic.
- the volume ratio of the capsule 38 to the volume in the continuous air hole 36 is about 22%.
- a solid lubricant such as a non-aqueous grinding liquid (an oily grinding liquid stock solution) and / or molybdenum disulfide.
- An emulsified liquid is prepared by adding and stirring a core substance composed of particles.
- (A) and (b) of FIG. 8 show this state.
- liquid gelatin or melamine resin is added and stirred to form a shell 44 made of gelatin or melamine resin around the core material.
- FIG. 8C shows this state.
- the capsule membrane stabilization step P63 by adding a curing agent and stirring, it has an average particle size of, for example, about 10 to 20 ⁇ m ⁇ , has a thickness of about 10% with respect to the diameter, and is cured.
- a microcapsule 38 having a skin 44 made of gelatin or melamine resin later is obtained in a state of being dispersed in a liquid. (D) and (e) of FIG. 8 show this state.
- the microcapsule 38 having the outer skin 44 made of gelatin with the microcapsule 38 having the outer skin 44 made of melamine resin, the latter was more uniform with a particle diameter of about 20 ⁇ m ⁇ .
- the vitrified grinding stone piece 26 is immersed in the treatment liquid created in the treatment liquid creation step P ⁇ b> 6 for about 1 minute, so that the treatment liquid is connected to the continuous vent hole of the vitrified grinding stone piece 26. 36 is impregnated. This impregnation may be performed at atmospheric pressure or vacuum impregnation performed in a vacuum.
- the vitrified grindstone piece 26 impregnated with the treatment liquid is dried at room temperature for 24 hours or dried under heating for several hours, and water in the treatment liquid is removed.
- the microcapsule 38 is locally filled in the continuous air hole 36 of the vitrified grindstone piece 26 and fixed to the inner wall surface of the continuous air hole 36. Then, the impregnation state is inspected in the inspection step P9.
- FIG. 9 and 10 show a cross section of the vitrified grindstone piece 26 manufactured by the process shown in FIG.
- FIG. 9 is a 100 ⁇ electron micrograph
- FIG. 10 is a 500 ⁇ electron micrograph.
- the continuous air holes 36 formed between the abrasive grains 34 bonded by vitrified bonds 32 are fixed in a state where spherical microcapsules 38 are filled at a predetermined ratio. Has been.
- Test wheel 1 CB80M200V (Vitrified grindstone pieces created in the process shown in FIG. 6, untreated product in which microcapsules are not filled in the continuous air holes)
- Test wheel 2 CB80M200V (Microcapsule treatment in which microcapsules having a vitrified grinding stone piece produced in the steps shown in FIG. 6 and FIG. 7 and a melamine-coated outer shell containing a non-aqueous grinding fluid are adhered in a state where the continuous air holes are partially filled.
- the camshaft shaft is a shaft integrally having the onigiri-shaped cam K shown in FIG. 14, and the outer periphery of the camshaft is ground (polished) using the test grindstone 1 and the test grindstone 2, respectively.
- the grinding burn of the abrasive (camshaft) H was evaluated using a color check solution (dye penetrant flaw detector).
- This color check liquid is composed of three liquids, a penetrating liquid, a removing liquid and a developer, which are sequentially applied, and reveals cracks, scratches, pinballs, etc. on the surface of the metal in red.
- FIG. 15 shows the color check result when the cam portion is ground using the untreated test grindstone 1.
- FIG. 16 shows a color check result when the outer peripheral surface of the cam K is ground using the test grindstone 2 subjected to microcapsule processing. On the outer peripheral surface of the lift part S, no occurrence of grinding burn cracks was observed.
- FIG. 17 shows the shape of the work material H having a shape similar to the crankshaft used by the inventors for the grinding test.
- This work material H has a cylindrical journal portion J to be supported by a bearing and a pair of shoulder portions S that sandwich the journal portion J in the direction of the axis C.
- the outer peripheral surface of the journal portion J And the end surfaces of the pair of shoulder portions S were ground (polished) using the test grindstone 1 and the test grindstone 2 described above.
- the test grindstone 1 was used, the end face of the shoulder portion S was burned, but when the test grindstone 2 was used, no burn was observed on the end face of the shoulder portion S.
- the microcapsule 38 containing the lubricant 42 for lubricating the grinding point that is, the cutting edge of the abrasive grain 34 is vitrified. Since it is fixed in a state of being partially filled in the continuous air hole 36 of the grindstone piece 26, the original function of the continuous air hole such as a function of supplying a grinding fluid and a chip pocket function for removing chips from a grinding point are provided.
- the abrasive grains 34 are diamond abrasive grains or CBN abrasive grains having an average particle diameter of 5 to 250 ⁇ m ⁇ , and the continuous air holes 36 are 5 to 500 ⁇ m ⁇ .
- the microcapsule 38 has an average particle diameter of 1 to 200 ⁇ m ⁇ . Thereby, in the manufacturing process of the vitrified grindstone piece 26, the microcapsule 38 can be easily put into the continuous air hole.
- the lubricant 42 included in the microcapsule 38 has a property of softening or degrading the work material H, for example, grinding.
- a liquid stock solution is used.
- a stock solution of a grinding fluid is used as the lubricant contained in the microcapsule 38, high lubrication performance is obtained, so that grinding burn is suitably prevented.
- the outer shell 44 of the microcapsule 38 is made of any one of gelatin, melamine resin, phenol resin, and urea resin. Since the outer shell of the microcapsule is made of such an organic material, the microcapsule 38 is easily broken on the grinding surface 20 and has an advantage that the grinding performance is not affected.
- the outer shell 44 of the microcapsule 38 may be made of an inorganic material such as glass.
- the adhesive for adhering the microcapsule 38 to the inner surface of the continuous air hole 36 is not necessarily a thermosetting resin, and may be a thermoplastic resin or CMC.
- the base layer 28 and the abrasive layer 30 that are radially arranged around the rotational axis W of the vitrified superabrasive grinding wheel 10 may have through holes penetrating them. Good.
- the base metal 18 is made of a metal such as carbon steel, an aluminum alloy and the like, and this configuration is preferable in order to have a strength that can withstand high-speed rotation, but is not limited thereto. It may be made of a fiber reinforced resin or a vitrified grindstone. Further, instead of the base metal 18, a disk-shaped base made of a sintered body of sintered metal or inorganic material may be used.
- Vitrified superabrasive wheel 20 Grinding surface 26: Vitrified wheel (vitrified wheel) 30: Abrasive material layer 34: Abrasive grain 36: Continuous air vent 38: Microcapsule 42: Lubricant 44: Outer skin
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Abstract
Description
原材料名 割合
CBN砥粒 (#80/100) 50容量部
ビトリファイドボンド 20容量部
糊量 6容量部
原材料名 割合
球状ムライト 35容量部
電溶ムライト 14容量部
ビトリファイドボンド 20容量部
糊量 6容量部
原材料名 割合
マイクロカプセル(ゼラチン) 10.5容積%
樹脂接着剤 5.4容積%
水 84.1容積%
原材料名 割合
マイクロカプセル(メラミン樹脂) 22.6容積%
樹脂接着剤 5.4容積%
水 72.0容積%
図11乃至図13は、以下に示す試験品1および2を用いて表5に示す試験条件下で本発明者が行った実験により、消費電力、研削焼け、砥石磨耗、面粗度について評価した平面研削試験結果を示している。図11乃至図13において、○印は試験砥石1(マイクロカプセル未処理品)を用いて研削した結果を示し、△印は試験砥石2(マイクロカプセル処理品)を用いて研削した結果を示している。図11乃至図13に示される平面研削試験結果によれば、マイクロカプセル処理された試験砥石2によれば、未処理品である試験砥石1に比較して、初期電力が低く(図11)、面粗度もやや向上し(図12)、砥石磨耗は同等である(図13)。
(図6に示す工程で作成したビトリファイド砥石片、マイクロカプセルが連通気孔内に充填されていない未処理品)
試験砥石2:CB80M200V
(図6および図7に示す工程で作成したビトリファイド砥石片、不水研削液内包のメラミン膜製外皮を有するマイクロカプセルが連通気孔内に部分的に充填された状態で接着されているマイクロカプセル処理品)
・研削盤:日立平面研削盤GHLB306-4
・砥石寸法:205mmφ×13mmT×76.2mmH
・被削材:SKD11(100mm×10mm×T)
・切込み:片側5μm/1パス
・テーブル送り速度:20m/min
・研削液:ノリタケクールSEC-700(株式会社ノリタケカンパニーリミテド製)
・ドレス:50mmφシャープナー2μm/切込
カムシャフト軸は、図14に示すオニギリ形の形状のカムKを一体に有する軸であり、このカムとの外周を上記の試験砥石1および試験砥石2を用いてそれぞれ研削(研磨)し、被研材(カムシャフト)Hの研削焼けをカラーチェック液(染色浸透探傷剤)を用いて評価した。このカラーチェック液は順次適用される浸透液、除去液、現像剤の3液から成り、金属の表面のクラック、傷、ピンボール等を赤色にて顕すものである。図15は、未処理の試験砥石1を用いてカム部を研削した場合のカラーチェック結果を示している。リフト部Lの外周面には、明確な研削焼け割れWが認められた。カムKの外周面のうち曲率半径の大きいリフト部Lで研削面荷が大きいため、そこに焼け割れが生じ易いからである。図16は、マイクロカプセル処理された試験砥石2を用いてカムKの外周面を研削した場合のカラーチェック結果を示している。リフト部Sの外周面には、研削焼け割れの発生は全く認められなかった。
図17は、本発明者が研削試験に用いたクランクシャフトに類似する形状の被削材Hの形状を示している。この被削材Hは、軸受けにより支持されるべき円柱状のジャーナル部Jとそのジャーナル部Jを軸心C方向において挟む一対のショルダー部Sとを有するものであり、そのジャーナル部Jの外周面と一対のショルダー部Sの端面とを、上記の試験砥石1および試験砥石2を用いてそれぞれ研削(研磨)した。試験砥石1を用いた場合には上記ショルダー部Sの端面に焼けが生じたが、試験砥石2を用いた場合には上記ショルダー部Sの端面に焼けが認められなかった。
20:研削面
26:ビトリファイド砥石片(ビトリファイド砥石)
30:砥材層
34:砥粒
36:連通気孔
38:マイクロカプセル
42:潤滑剤
44:外皮
Claims (6)
- 砥粒と、該砥粒を結合する無機結合剤と、該砥粒および無機結合剤の間に形成される連通気孔とを有するビトリファイド砥石であって、
潤滑剤を内包するマイクロカプセルが、前記連通気孔内に部分的に充填された状態で固着されていることを特徴とするビトリファイド砥石。 - 前記マイクロカプセルは、1乃至200μmφの平均粒径を備えたものである請求項1のビトリファイド砥石。
- 前記マイクロカプセルに内包される潤滑剤は、研削液から成るものであることを特徴とする請求項1または2のビトリファイド砥石。
- 前記マイクロカプセルの外皮は、ゼラチン、メラミン樹脂、フェノール樹脂、尿素樹脂のいずれかから成ることを特徴とする請求項1乃至3のいずれか1のビトリファイド砥石。
- 前記砥粒は、5乃至250μmφの平均粒径を有するダイヤモンド砥粒またはCBN砥粒であり、前記連通気孔は、5乃至500μmφの平均内径を有するものであることを特徴とする請求項1乃至4のいずれか1のビトリファイド砥石。
- 超砥粒砥石ホイールのコアの外周面に貼り着けられた複数個の砥石片である請求項5のビトリファイド砥石。
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US13/056,828 US8568499B2 (en) | 2008-07-31 | 2009-07-02 | Vitrified grinding stone |
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JP2008198353A JP5065197B2 (ja) | 2008-07-31 | 2008-07-31 | ビトリファイド砥石 |
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JP2012152882A (ja) * | 2011-01-28 | 2012-08-16 | Mitsui Kensaku Toishi Kk | ビトリファイド多層砥石車 |
US9266220B2 (en) | 2011-12-30 | 2016-02-23 | Saint-Gobain Abrasives, Inc. | Abrasive articles and method of forming same |
WO2014106198A1 (en) * | 2012-12-31 | 2014-07-03 | Saint-Gobain Abrasives, Inc. | Abrasive article having a core of an organic material and a bonded abrasive body comprising a bond material |
JP6524783B2 (ja) * | 2015-04-27 | 2019-06-05 | 株式会社ジェイテクト | 砥石の製造方法 |
US9987728B2 (en) | 2016-01-08 | 2018-06-05 | Saint-Gobain Abrasives, Inc. | Abrasive articles including an abrasive performance enhancing composition |
DE112017003526T5 (de) * | 2016-07-12 | 2019-03-28 | Noritake Co., Limited | Polierkörper und herstellungsverfahren dafür |
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JP2000079566A (ja) * | 1998-09-01 | 2000-03-21 | Ricoh Co Ltd | 砥粒工具およびその砥粒工具の製造方法 |
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JP2001205566A (ja) * | 2000-01-26 | 2001-07-31 | Noritake Co Ltd | 樹脂含浸ビトリファイド砥石およびその製造方法 |
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US8568499B2 (en) | 2013-10-29 |
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