WO2017098764A1 - 超砥粒ホイール - Google Patents
超砥粒ホイール Download PDFInfo
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- WO2017098764A1 WO2017098764A1 PCT/JP2016/076454 JP2016076454W WO2017098764A1 WO 2017098764 A1 WO2017098764 A1 WO 2017098764A1 JP 2016076454 W JP2016076454 W JP 2016076454W WO 2017098764 A1 WO2017098764 A1 WO 2017098764A1
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- Prior art keywords
- superabrasive
- wheel
- workpiece
- evaluation
- grains
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Classifications
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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
- B24D5/02—Wheels in one piece
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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
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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
- B24D3/06—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 metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
Definitions
- the present invention relates to a superabrasive wheel.
- This application claims priority based on Japanese Patent Application No. 2015-241160 filed on Dec. 10, 2015, and incorporates all the content described in the Japanese application.
- a superabrasive wheel provided with a superabrasive layer on which a superabrasive such as CBN abrasive or diamond abrasive is fixed by metal plating is disclosed in Japanese Patent Application Laid-Open No. 5-16070 (Patent Document 1). Japanese Unexamined Patent Publication No. 2000-233370 (Patent Document 2) and Japanese Patent Laid-Open No. 5-200670 (Patent Document 3).
- the superabrasive wheel according to one aspect of the present invention is a superabrasive wheel having a superabrasive layer in which the superabrasive particles are fixed by a binder, and the superabrasive grain occupation area ratio in the superabrasive layer. Is 20% to 70%.
- FIG. 1 is a plan view of a superabrasive wheel according to an embodiment.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG.
- FIG. 3 is an enlarged cross-sectional view of one abrasive grain in FIG.
- metal plating deposited on the base metal grows filling the gaps between the superabrasive grains.
- the metal plating is deposited to such a thickness that the metal plating can firmly hold the superabrasive grains.
- Nickel plating is mainly used as the metal plating.
- the superabrasive wheel thus configured is called an electrodeposited superabrasive wheel. Since the superabrasive grains are fixed in an ideal state where the tips of the superabrasive grains are fully exposed, dressing is unnecessary, the chip pocket capacity is large, clogging due to chips is small, and the sharpness is extremely good. Widely used for high-efficiency grinding and rough grinding.
- the heights of the superabrasive tips are not uniform due to the variation in the grain size of the superabrasive grains and the posture in which the superabrasive grains are fixed. For this reason, since a high-precision surface roughness of a workpiece cannot be obtained, it is used by truing in the precision grinding field. In this case, since the superabrasive layer is a single layer, there is a problem that sharpness is lowered and the life is shortened by excessive truing.
- a brazing type superabrasive wheel having a superabrasive layer in which superabrasive grains such as CBN abrasive grains or diamond abrasive grains are fixed by a brazing material on a base metal is also known. Similar to the electrodeposited superabrasive wheel, the height of the superabrasive tips is not uniform due to the variation in the grain size of the superabrasive grains and the posture in which the superabrasive grains are fixed. For this reason, since a highly accurate surface roughness of a workpiece cannot be obtained, it is used by truing in the precision grinding field. However, since the superabrasive layer is a single layer, there is a problem that sharpness is lowered and the life is shortened by excessive truing.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide a superabrasive wheel having a good sharpness and a long life.
- the invention made by such knowledge is a superabrasive wheel having a superabrasive layer in which superabrasive grains are fixed by a binder, and the occupied area ratio of the superabrasive grains in the superabrasive layer is 20%. It relates to a superabrasive wheel of ⁇ 70%.
- the average grain size of the superabrasive grains is 5 ⁇ m to 2000 ⁇ m.
- the area ratio at which the tip of the superabrasive grain acts on the workpiece is 1% to 30% per unit area of the superabrasive layer surface.
- the superabrasive layer has the superabrasive grains fixed to one layer, and the binder is metal plating or brazing material.
- the thickness of the binder is 30% to 90% of the average particle size of the superabrasive grains.
- the plurality of superabrasive grains act on the workpiece, and the variation in the height of the tips of the plurality of superabrasive grains acting on the workpiece is 5 ⁇ m or less.
- the superabrasive wheel is used for precision grinding where the surface roughness of the workpiece is 5 ⁇ mRz or less.
- the area occupied by the superabrasive grains in the superabrasive grain layer is 30% to 70%.
- the thickness of the binder is 30% to 80% of the average particle diameter of the superabrasive grains.
- a superabrasive wheel 1 is a superabrasive wheel 1 having a superabrasive layer 10 to which superabrasive grains 101, 102, and 103 are fixed by a binder 100, and is superabrasive.
- the occupied area ratio of the superabrasive grains 101, 102, 103 in the grain layer 10 is 20% to 70%.
- the occupied area ratio is defined as a ratio of the area occupied by the superabrasive grains per unit area of the superabrasive grain layer 10 when the superabrasive grain layer 10 is observed from directly above, for example, per 1 mm 2 .
- the occupied area ratio of the superabrasive grains 101, 102, 103 In order to measure the occupied area ratio of the superabrasive grains 101, 102, 103, first, electronic image data is obtained from SEM (scanning electron microscope) observation of the surface of the superabrasive grain layer 10.
- the superabrasive grains 101, 102, 103 and the binder 100 are classified by image analysis software. For example, in the field of view of 1000 ⁇ m ⁇ 1000 ⁇ m, the occupied area ratio is measured at three arbitrary locations, and the exclusive area ratio at the three locations is averaged.
- the occupied area ratio of superabrasive grains 101, 102, 103 is preferably 30% to 70%, more preferably 35% to 70%. .
- the average grain size of the superabrasive grains 101, 102, 103 is 5 ⁇ m to 2000 ⁇ m.
- the binder 100 is melted and the superabrasive grains 101, 102, 103 are removed from the superabrasive wheel 1.
- the superabrasive wheel 1 is small, the superabrasive grains 101, 102, 103 are removed from the entire superabrasive wheel 1.
- the superabrasive wheel 1 is large, it may be difficult to remove the superabrasive grains 101, 102, 103 from the entire superabrasive wheel 1. In that case, a portion having an area of 25 mm 2 or more is peeled off from the superabrasive layer 10.
- Superabrasive grains 101, 102, 103 are taken out from the stripped portions.
- the average particle diameter of the superabrasive grains 101, 102, 103 is measured with a laser diffraction particle size distribution measuring device (for example, SALD series manufactured by Shimadzu Corporation).
- the area ratio at which the tips 101a and 103a of the superabrasive grains 101 and 103 act on the workpiece is 1% to 30% per unit area of the surface of the superabrasive grain layer 10.
- the area ratio at which the tips 101a and 103a of the superabrasive grains 101 and 103 act on the workpiece is, for example, 1 mm per unit area of the superabrasive grain layer 10 when the superabrasive grain layer 10 is observed from directly above. It is defined as the ratio of the area where the tips 101a and 103a of the superabrasive grains 101 and 103 act on the workpiece per two .
- the electronic data of the image is obtained from SEM (scanning electron microscope) observation of the surface of the superabrasive grain layer 10, and the image The calculation is performed by obtaining the area ratio of the surfaces acting on the workpiece of the tips 101a and 103a of the superabrasive grains 101 and 103 with analysis software. Since the protrusion 102a of the superabrasive grain 102 is not formed with irregularities, it is not used for processing. Therefore, the area of the tip 102 is not an area that affects the processing.
- the protrusions 101a and 103a of the superabrasive grains 101 and 103 are provided with irregularities 101b and 103b having a height of 1 ⁇ m or more.
- irregularities 101b and 103b of 2 ⁇ m or more are formed at the tip, and it is most preferable that irregularities 101b and 103b of 3 ⁇ m or more are formed.
- the size of the projections 101a and 103a of the projections 101b and 103b can be measured by a laser microscope that is excellent in measuring a complicated fine shape and can observe and measure the three-dimensional surface shape of the sample without contact.
- a laser microscope for example, Olympus Corporation 3D measurement laser microscope OLS series, Keyence Corporation shape analysis laser microscope VX series can be applied.
- the height t2 of the unevenness 101b indicates a difference in height between the highest portion and the lowest portion of the unevenness 101b.
- the superabrasive grain layer 10 has superabrasive grains 101, 102, and 103 fixed to one layer, and the binder 100 is a metal plating or brazing material.
- metal plating or brazing material can be used as the binding material. Nickel plating is preferred as the metal plating, and silver brazing is preferred as the brazing material.
- the thickness of the binder 100 is 30% to 90% of the average particle diameter of the superabrasive grains 101, 102, 103.
- the thickness of the binder 100 is a superabrasive wheel that is 30% to 90% of the average grain size of the superabrasive grains 101, 102, 103.
- the thickness of the binder 100 is more preferably 30% to 80% of the average grain size of the superabrasive grains 101, 102, 103. 30% to 70% is most preferable.
- the plurality of superabrasive grains 101, 102, 103 act on the workpiece, and the heights of the protrusions 101 a, 103 a of the plurality of superabrasive grains 101, 102, 103 that act on the workpiece
- the variation t1 is 5 ⁇ m or less. More preferably, the height variation t1 of the tips 101a, 103a of the superabrasive grains 101, 102, 103 acting on the workpiece is 4 ⁇ m or less.
- the variation t1 is most preferably 3 ⁇ m or less.
- the variation in the height of the tip of superabrasive grains acting on the workpiece can be measured by a shape analysis laser microscope (for example, a laser microscope manufactured by Keyence Corporation, VX series).
- the variation t1 is a difference in height between the highest part and the lowest part of all the unevennesses 101b and 103b.
- the surface of the superabrasive grain layer 10 having an area of 1 mm 2 is three-dimensionally measured, and the surface roughness of the superabrasive grains 101, 102, 103 acting is measured to measure the unevenness.
- the difference in height between the highest part and the lowest part is defined as variation.
- the superabrasive wheel is used for precision grinding where the surface roughness of the workpiece is 5 ⁇ mRz or less.
- the surface roughness (Rz: 10-point average roughness) is measured based on JIS B 0610 (2001).
- Example 1 An electrodeposited CBN wheel of sample number 1-20 was produced as follows.
- masking was applied to all surfaces of the base metal except the surface on which the superabrasive grain layer was formed using a masking material such as a masking tape or a masking coating agent.
- nickel plating is deposited on the unmasked portion of the surface of the base metal in the plating tank in which the CBN abrasive grains are uniformly dispersed, and the nickel plating is a gap between the superabrasive grains.
- the nickel plating was deposited to such a thickness that the nickel plating could hold the CBN abrasive grains, and a complete single-layer CBN abrasive grain layer was obtained.
- the masking material such as masking tape or masking coating agent was removed.
- the electrodeposited CBN wheel manufactured in this way has the tip of the CBN abrasive grain protruding sufficiently from the nickel plating layer, and the sharpness is outstanding, but the variation in the grain size of the CBN abrasive grain and the CBN abrasive The heights of the tips of the CBN abrasive grains were uneven due to the posture where the grains were fixed.
- Evaluation A in “Sharpness” in the “Wheel Performance” column of Table 1 indicates that the workpiece did not burn. Rating C indicates that a clear burn has occurred on the workpiece. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. It was found that the wheel of evaluation C can be used in a field where burning is not a problem although it causes burning on the workpiece.
- the definition of evaluation in the column of “Life” is as follows. The life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished. Evaluation A indicates that the relative life when the life of the sample number 1 is “1” is “0.8 or more. Evaluation D indicates that the relative life when the life of the sample number 1 is“ 1 ”. It shows that it is “less than 0.4”.
- Example 2 Electrodeposited CBN wheels of sample numbers 30-34 shown in Table 2 were produced in the same manner as in Example 1. In Sample No. 35, since there were too many superabrasive grains, an electrodeposited CBN wheel could not be produced.
- Evaluation A in “Sharpness” in the “Wheel Performance” column of Table 2 indicates that the workpiece did not burn.
- Evaluation B shows that slight burn occurred. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. The wheel of evaluation B was found to exhibit excellent sharpness.
- evaluations A to C in the “Life” column are as follows.
- the life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished.
- Evaluation A indicates that the relative life when the life of the sample number 31 is “1” is “0.8 or more.
- Evaluation B indicates that the relative life when the life of the sample number 31 is“ 1 ”is“ 1 ”. "Less than 0.8”.
- Evaluation C indicates that the relative life is “less than 0.6” when the life of the sample number 31 is “1”.
- the wheel of evaluation A showed an extremely excellent life.
- the wheel of rating B was found to show an excellent life.
- the wheel of rating C was found to show a normal life.
- the super abrasive grain occupation area ratio needs to be 20% or more and 70% or less, and 30% or more and 70% or less is preferable.
- Example 3 Electrodeposited CBN wheels of sample numbers 40-44 shown in Table 3 were produced in the same manner as in Example 1.
- Evaluation A in “Sharpness” in the “Wheel Performance” column of Table 3 indicates that the workpiece did not burn.
- Evaluation B shows that slight burn occurred. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. The wheel of evaluation B was found to exhibit excellent sharpness.
- evaluations A and B in the “Life” column are as follows.
- the life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished.
- Evaluation A indicates that the relative life when the life of the sample number 41 is “1” is “0.8 or more.
- Evaluation B indicates that the relative life when the life of the sample number 41 is“ 1 ”is“ 1 ”. "Less than 0.8".
- the average particle size of the superabrasive grains is 5 ⁇ m to 2000 ⁇ m.
- Example 4 Electrodeposited CBN wheels of sample numbers 50 and 51 shown in Table 4 were produced in the same manner as in Example 1.
- Evaluation A in “Sharpness” in the “Wheel Performance” column of Table 4 indicates that the workpiece did not burn.
- Evaluation B shows that slight burn occurred. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. The wheel of evaluation B was found to exhibit excellent sharpness.
- evaluations A and B in the “Life” column are as follows.
- the life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished.
- Evaluation A indicates that the relative life when the life of the sample number 51 is “1” is “0.8 or more.
- Evaluation B indicates that the relative life when the life of the sample number 51 is“ 1 ”is“ 1 ”. "Less than 0.8".
- Example 5 Electrodeposited CBN wheels with sample numbers 60 to 65 shown in Table 5 were produced in the same manner as in Example 1.
- Evaluation A in “Sharpness” in the “Wheel Performance” column of Table 2 indicates that the workpiece did not burn.
- Evaluation B shows that slight burn occurred. Rating C indicates that a clear burn has occurred on the workpiece. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. The wheel of evaluation B was found to exhibit excellent sharpness. It was found that the wheel of evaluation C can be used in a field where burning is not a problem although it causes burning on the workpiece.
- evaluations A to C in the “Life” column are as follows.
- the life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished.
- Evaluation A indicates that the relative life when the life of the sample number 62 is “1” is “0.8 or more.
- Evaluation B indicates that the relative life when the life of the sample number 62 is“ 1 ”is“ 1 ”. "Less than 0.8”.
- Evaluation C indicates that the relative life when the life of the sample number 62 is “1” is “less than 0.6”.
- the wheel of evaluation A showed an extremely excellent life.
- the wheel of rating B was found to show an excellent life.
- the wheel of rating C was found to show a normal life.
- the thickness of the binder relative to the average particle diameter is preferably 30% or more and 90% or less, and most preferably 30% or more and 80% or less.
- Example 6 Electrodeposited CBN wheels of sample numbers 70-74 shown in Table 6 were produced in the same manner as in Example 1. However, superabrasive grains were fixed by plating in Embodiment 1, but superabrasive grains were fixed by brazing material in sample numbers 70-74.
- Evaluation A in “Sharpness” in the “Wheel performance” column of Table 6 indicates that the workpiece did not burn.
- Evaluation B shows that slight burn occurred. It was found that the wheel of evaluation A exhibited extremely excellent sharpness. The wheel of evaluation B was found to exhibit excellent sharpness.
- evaluations A and B in the “Life” column are as follows.
- the life of the wheel is estimated from the shape of the tip when the grinding of each sample number is finished.
- Evaluation A indicates that the relative life when the life of the sample number 71 is “1” is “0.8 or more.
- Evaluation B indicates that the relative life when the life of the sample number 71 is“ 1 ”is“ 1 ”. "Less than 0.8".
- the thickness of the binder with respect to the average particle diameter is preferably 1 ⁇ m or more and 5 ⁇ m or less.
- the embodiments and examples of the present invention have been described above, the embodiments and examples shown here can be variously modified. Specifically, when the above invention is applied to a CBN wheel used for mass production of steel parts of various machines and steel parts of automobiles by grinding, high-precision machining results can be obtained, and stable and good Sharpness is also obtained and it has a long life. Further, the above invention may be applied to a diamond wheel. In addition, the above-described wheel can be used in the field of superabrasive tools, for example, superabrasive grinding wheels used to grind a workpiece into a total shape or the like, and superabrasive polishing wheels.
- superabrasive tools for example, superabrasive grinding wheels used to grind a workpiece into a total shape or the like, and superabrasive polishing wheels.
- 1 Super abrasive wheel 10 Super abrasive layer, 100 binder, 101, 102, 103 Super abrasive, 101a, 102a, 103a protrusion, 101b, 103b irregularities.
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Abstract
Description
最初に本願発明の実施態様を列記して説明する。
好ましくは、超砥粒の突端が工作物に作用する面積割合は、超砥粒層表面の単位面積当たり1%~30%である。
好ましくは、超砥粒層は超砥粒が一層に固着され、結合材は金属めっき、またはロウ材である。
好ましくは、複数の超砥粒が工作物に作用し、工作物に作用する複数の超砥粒の突端の高さのバラツキは5μm以下である。
好ましくは、前記結合材の厚みは、前記超砥粒の平均粒径の30%~80%である。
図1から3を参照して、超砥粒ホイール1は、超砥粒101,102,103が結合材100により固着された超砥粒層10を有する超砥粒ホイール1であって、超砥粒層10での超砥粒101,102,103の占有面積割合が20%~70%である。ここで、占有面積割合とは、超砥粒層10を真上から観察したときに超砥粒層10の単位面積当たり、たとえば1mm2当たりに超砥粒が占有する面積の割合と定義する。
以下のようにして、試料番号1-20の電着CBNホイールを作製した。
さらに工作物およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒50m
送り速度:毎分600mm
研削テスト時間:5時間
表1の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Bは工作物の表面粗さがRz5μmを超え表面粗さRz7μm以下であったことを示す。評価Cは工作物の表面粗さがRz7μmを超えていたことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。評価Bのホイールは、優れた効果を示すことが分かった。評価Cのホイールは、実用に供することができないものであることが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号1の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Dは、試料番号1の寿命を「1」としたときの相対寿命が「0.4未満」であることを示す。
表2に示す試料番号30-34の電着CBNホイールを、実施例1と同様の方法で作製した。なお、試料番号35では超砥粒が多すぎたため、電着CBNホイールを作製することができなかった。
さらに工作物の表面およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒50m
送り速度:毎分600mm
研削テスト時間:5時間
表2の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Bは工作物の表面粗さがRz5μmを超え表面粗さRz7μm以下であったことを示す。評価Cは工作物の表面粗さがRz7μmを超えていたことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。評価Bのホイールは、優れた効果を示すことが分かった。評価Cのホイールは、実用に供することができないものであることが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号31の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Bは試料番号31の寿命を「1」としたときの相対寿命が「0.8未満」であることを示す。評価Cは試料番号31の寿命を「1」としたときの相対寿命が「0.6未満」であることを示す。
表3に示す試料番号40-44の電着CBNホイールを、実施例1と同様の方法で作製した。
さらに工作物の表面およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒60m
送り速度:毎分620mm
研削テスト時間:5時間
この切削条件は、実施例1と比較して高速のホイール周速度および送りであるため、過酷な研削条件であった。表3の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Bは工作物の表面粗さがRz5μmを超え表面粗さRz7μm以下であったことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。評価Bのホイールは、優れた効果を示すことが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号41の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Bは試料番号41の寿命を「1」としたときの相対寿命が「0.8未満」であることを示す。
表4に示す試料番号50および51の電着CBNホイールを、実施例1と同様の方法で作製した。
さらに工作物の表面およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒60m
送り速度:毎分700mm
研削テスト時間:5時間
この切削条件は、実施例1と比較して高速のホイール周速度および送りであるため、過酷な研削条件であった。表4の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号51の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Bは試料番号51の寿命を「1」としたときの相対寿命が「0.8未満」であることを示す。
(実施例5)
表5に示す試料番号60から65の電着CBNホイールを、実施例1と同様の方法で作製した。
さらに工作物の表面およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒50m
送り速度:毎分650mm
研削テスト時間:5時間
この切削条件は、実施例1と比較して高速の送りであるため、過酷な研削条件であった。表5の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Bは工作物の表面粗さがRz5μmを超え表面粗さRz7μm以下であったことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。評価Bのホイールは、優れた効果を示すことが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号62の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Bは試料番号62の寿命を「1」としたときの相対寿命が「0.8未満」であることを示す。評価Cは試料番号62の寿命を「1」としたときの相対寿命が「0.6未満」であることを示す。
表6に示す試料番号70-74の電着CBNホイールを、実施例1と同様の方法で作製した。ただし、実施の形態1ではメッキで超砥粒を固定したが、試料番号70-74ではロウ材で超砥粒を固定した。
さらに工作物の表面およびホイールの表面を観察して、切れ味および寿命を評価した。
ホイールの周速度:毎秒70m
送り速度:毎分700mm
研削テスト時間:5時間
この切削条件は、実施例1と比較して高速のホイール周速度および送りであるため、過酷な研削条件であった。表6の「ホイール性能」の欄の「工作物の表面粗さ」における評価Aは工作物の表面粗さがRz5μm以下であったことを示す。評価Bは工作物の表面粗さがRz5μmを超え表面粗さRz7μm以下であったことを示す。評価Aのホイールは、極めて優れた効果を示すことが分かった。評価Bのホイールは、優れた効果を示すことが分かった。
各試料番号のホイールにおいて研削加工が終了したときの突端の形状から、ホイールのの寿命を推定する。評価Aは試料番号71の寿命を「1」としたときの相対寿命が「0.8以上であることを示す。評価Bは試料番号71の寿命を「1」としたときの相対寿命が「0.8未満」であることを示す。
Claims (10)
- 超砥粒が結合材により固着された超砥粒層を有する超砥粒ホイールであって、
前記超砥粒層での前記超砥粒の占有面積割合が20%~70%である超砥粒ホイール。 - 前記超砥粒の平均粒径は、5μm~2000μmである、請求項1に記載の超砥粒ホイール。
- 前記超砥粒の突端が工作物に作用する面積割合は、前記超砥粒層表面の単位面積当たり1%~30%である、請求項1または2に記載の超砥粒ホイール。
- 前記超砥粒の突端には高さが1μm以上の凹凸が形成されている、請求項1から3のいずれか1項に記載の超砥粒ホイール。
- 前記超砥粒層では前記超砥粒が一層に固着され、前記結合材は金属めっき、またはロウ材である、請求項1から4のいずれか1項に記載の超砥粒ホイール。
- 前記結合材の厚みは、前記超砥粒の平均粒径の30%~90%である、請求項1から5のいずれか1項に記載の超砥粒ホイール。
- 複数の前記超砥粒が工作物に作用し、工作物に作用する複数の前記超砥粒の突端の高さのバラツキは5μm以下である、請求項1から6のいずれか1項に記載の超砥粒ホイール。
- 工作物の表面粗さが5μmRz以下である精密研削加工に用いる、請求項1から7のいずれか1項に記載の超砥粒ホイール。
- 前記超砥粒層での前記超砥粒の占有面積割合が30%~70%である、請求項1から8のいずれか1項に記載の超砥粒ホイール。
- 前記結合材の厚みは、前記超砥粒の平均粒径の30%~80%である、請求項1から9のいずれか1項に記載の超砥粒ホイール。
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JP2016557156A JP6127220B1 (ja) | 2015-12-10 | 2016-09-08 | 超砥粒ホイール |
CN201680013176.8A CN107405755B (zh) | 2015-12-10 | 2016-09-08 | 超硬磨料砂轮 |
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TW201722626A (zh) | 2017-07-01 |
US10307888B2 (en) | 2019-06-04 |
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