WO2013076905A1 - バンドソー切断装置及びインゴットの切断方法 - Google Patents
バンドソー切断装置及びインゴットの切断方法 Download PDFInfo
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- WO2013076905A1 WO2013076905A1 PCT/JP2012/006576 JP2012006576W WO2013076905A1 WO 2013076905 A1 WO2013076905 A1 WO 2013076905A1 JP 2012006576 W JP2012006576 W JP 2012006576W WO 2013076905 A1 WO2013076905 A1 WO 2013076905A1
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- ingot
- blade
- cutting
- static pressure
- band saw
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/08—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with saw-blades of endless cutter-type, e.g. chain saws, i.e. saw chains, strap saws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
- B23D55/08—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for guiding or feeding strap saw blades
- B23D55/082—Devices for guiding strap saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
- B23D55/08—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for guiding or feeding strap saw blades
- B23D55/082—Devices for guiding strap saw blades
- B23D55/086—Devices for guiding strap saw blades with means for automatically adjusting the distance between the guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/04—Devices for lubricating or cooling straight or strap saw blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
- B28D5/045—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools by cutting with wires or closed-loop blades
Definitions
- the present invention relates to a band saw cutting apparatus for cutting an ingot, particularly an ingot produced by the Czochralski method (CZ method), and an ingot cutting method.
- CZ method Czochralski method
- An ingot such as a silicon ingot manufactured by the CZ method or the like has a cone-shaped end portion (top portion and tail portion) in a cylindrical body portion.
- these cone-shaped end portions are cut off to form only a cylindrical body portion, and the body portion is cut into a plurality of blocks as necessary.
- processing for making the block into a wafer is performed.
- an inner peripheral blade slicer, an outer peripheral blade slicer, and the like have been often used. With the recent increase in wafer diameter, many band saw cutting apparatuses have been used (see, for example, Patent Document 1).
- the band saw cutting apparatus 101 is provided with a cutting table 105 for supporting an ingot 104 during cutting. Prior to cutting, the ingot 104 is placed horizontally on the cutting table 105.
- an endless belt-like blade 102 composed of a blade abrasive grain portion formed by gluing diamond abrasive grains to the end portion of a thin blade base metal is stretched between pulleys 103 and 103 ′. It is installed.
- the mounting position of the ingot 104 is adjusted so that the position at which the ingot 104 is cut before the cutting matches the blade 102. Then, the blade 102 is driven by the rotation of the pulleys 103 and 103 ′, and the blade 102 is relatively sent out from the upper side of the ingot 104 to cut the ingot 104. If the cutting is repeated in this way, the cutting powder accumulates on the blade abrasive grain portion and the diamond abrasive grains are buried, or the abrasive grains are worn or dropped by the cutting, and the cutting ability is reduced.
- the blade edge is displaced to a side having a higher cutting ability with respect to the ingot being cut.
- the ingot to be cut has a specific direction that is easily cut due to the crystal arrangement, and the blade edge tends to advance in this specific direction, and the blade moves back and forth with respect to the axial direction of the ingot. It is displaced to.
- blades that are used in band saw cutting devices have become thinner in order to improve product yield by reducing the allowance for cutting ingots. In particular, when such a thin blade is used, the blade tends to be displaced.
- Displacement of the blade causes generation of steps and chips on the cut surface in terms of quality, a wafer with a large warp when cutting a sample wafer for evaluating crystal quality, and a wafer with a large processing distortion on the cut surface.
- the blade life is reduced, and blade damage causes equipment damage.
- the band saw cutting apparatus 101 is provided with static pressure pads 106 and 106 ′ before and after the cutting position of the ingot 104 in the circumferential direction of the blade 102. ing.
- the displacement of the blade is not stably suppressed between the start of cutting and the end of cutting.
- the displacement of the blade becomes large, causing a step or chipping on the cut surface, or warping of the cut sample wafer when cutting the sample wafer for evaluating the crystal quality.
- the product yield and the blade life are reduced.
- the cutting speed cannot be improved due to the large displacement of the blade.
- the present invention has been made in view of the above-described problems, and can stably suppress the displacement of the blade during cutting, thereby stably maintaining the quality of the cut surface of the cut ingot block and sample wafer.
- An object of the present invention is to provide a band saw cutting device and an ingot cutting method capable of extending the life of the blade and improving the cutting speed.
- a cutting table for horizontally placing an ingot, and an endless member for cutting the ingot, which is stretched between pulleys and driven around by rotation of the pulleys.
- a belt-shaped blade and a blade-shaped blade are arranged before and after the cutting position of the ingot with respect to the circumferential direction of the blade, respectively, and coolant is ejected from both side surfaces of the blade to the axial direction of the ingot being cut.
- a static pressure pad for guiding the ingot so as not to be displaced, and by feeding the blade relatively downward from above the ingot while guiding the circularly driven blade by the static pressure pad.
- a band saw cutting device for cutting wherein the hydrostatic pad is further moved in the circumferential direction of the blade.
- a control unit for controlling the moving distance and moving speed of the static pressure pad by the driving unit, and the ingot while controlling the movement of the static pressure pad by the control unit.
- the distance between each static pressure pad and the ingot and the distance between the static pressure pads can be controlled according to the position of the cutting part of the ingot during cutting, so that the blade displacement is stable. Can be suppressed. As a result, the quality of the cut surface can be stably maintained, the blade life can be extended, and the cutting speed can be improved.
- the movement of the static pressure pad during the cutting of the ingot is controlled so as to follow the side shape of the ingot.
- the displacement of the blade can be more reliably and stably suppressed.
- an ingot is horizontally placed on a cutting table, and an endless belt-like blade for cutting the ingot is driven between the pulleys, and is driven by rotation of a pulley.
- a static pressure pad for injecting coolant from both side surfaces of the blade to guide the blade so as not to be displaced with respect to the axial direction of the ingot being cut before and after the cutting position of the ingot with respect to the circumferential direction of the blade.
- An ingot cutting method for cutting the ingot by feeding the blade relatively downward from above the ingot while guiding the blade, which is arranged and driven around, by the static pressure pad. The ingot is cut while moving the pressure pad in the front-rear direction with respect to the circumferential direction of the blade.
- the method for cutting the ingot which comprises is provided.
- the distance between each static pressure pad and the ingot and the distance between the static pressure pads can be adjusted according to the position of the cutting portion of the ingot during cutting, so that the blade displacement is stable. Can be suppressed. As a result, the quality of the cut surface can be stably maintained, the blade life can be extended, and the cutting speed can be improved.
- the movement of the static pressure pad during the cutting of the ingot is performed along the side surface shape of the ingot. In this way, the displacement of the blade can be more reliably and stably suppressed.
- the ingot is cut while controlling the movement of the static pressure pad in the front-rear direction with respect to the circumferential direction of the blade by the control unit. Since the distance between the static pressure pad and the ingot and the distance between the static pressure pads can be appropriately controlled, the displacement of the blade can be stably suppressed. Thereby, the quality of the cut surface can be kept stable, the life of the blade can be extended, and the cutting speed can be improved.
- a band saw cutting device for cutting an ingot is provided with a static pressure pad for suppressing displacement of a blade.
- the displacement of the blade may increase during the cutting. This causes problems such as deterioration in cutting accuracy and cut surface quality, reduction in blade life, and inability to improve cutting speed. Therefore, it has been a problem to stably suppress the displacement of the blade from the start of cutting to the end of cutting.
- the present inventor has intensively studied to solve such problems. As a result, it has been found that fixing the position where the blade is guided by the static pressure pad from the start of cutting to the end of cutting cannot prevent the displacement of the blade stably. Then, it was conceived that the displacement of the blade can be stably suppressed by controlling the position of the static pressure pad while moving the static pressure pad in the front-rear direction with respect to the circumferential direction of the blade. And the structure of the apparatus for implementing this was examined and the present invention was completed.
- the band saw cutting apparatus 1 of the present invention drives a cutting table 5 for placing an ingot 4 horizontally, an endless belt-like blade 2 for cutting the ingot 4, and a blade 2.
- Pulleys 3 and 3 ' for the purpose, and static pressure pads 6 and 6' for guiding the blade 2 so as not to be displaced with respect to the axial direction of the ingot 4 being cut.
- the material of the static pressure pad can be a carbon material, for example.
- the blade 2 is constituted by a blade abrasive grain portion formed by adhering diamond abrasive grains to an end portion of a thin blade base metal.
- the particle size of the blade abrasive grain portion can be 120 to 220
- the width of the blade base metal is 60 mm
- the thickness is 0.1 to 0.7 mm. It can be.
- the pulleys 3 and 3 ′ are configured to be rotatable around the rotation axis thereof, and are arranged so that the rotation axis is perpendicular to the central axis of the ingot 4 placed horizontally on the cutting table 5.
- An endless belt-like blade 2 is stretched between these pulleys 3 and 3 'so that the blade abrasive grains are directed downward.
- the blade 2 is driven to rotate as the pulleys 3 and 3 'rotate.
- either one of the two pulleys 3 and 3 ′ that can be rotationally driven may be one-axis driving, or both may be two-axis driving.
- the tension for lifting the blade 2 between the pulleys 3 and 3 ′ can be 1 t or more.
- the cutting table 5 has a moving mechanism that adjusts the position where the ingot 4 is cut to the position of the blade 2.
- the static pressure pads 6 and 6 'are configured to guide the blade so as not to be displaced with respect to the axial direction of the ingot 4 being cut, and are composed of a pair of pad members. Each pad member is provided with a jet outlet for jetting coolant.
- coolant is ejected from the ejection ports of the static pressure pads 6 and 6 ′ to both side surfaces of the blade, so that clogging of the blade abrasive grains and processing heat are removed and the injected coolant is removed.
- the displacement of the blade 2 by static pressure is suppressed.
- a displacement sensor 11 for measuring the displacement of the blade 2 can be provided.
- the static pressure pads 6 and 6 ′ are arranged at positions between the ingot 4 and the pulleys 3 and 3 ′, that is, the ingot 4 with respect to the circumferential direction of the blade 2. Are arranged respectively before and after the cutting position.
- the band saw cutting device of the present invention is provided with driving units 7 and 7 ′ and a control unit 8 as shown in FIG.
- the drive units 7 and 7 ′ move the static pressure pads 6 and 6 ′ in the front-rear direction with respect to the circumferential direction of the blade 2, and can be configured using, for example, an LM guide or a ball screw.
- the control unit 8 controls the moving distance and moving speed when the static pressure pads 6 and 6 ′ are moved by the driving units 7 and 7 ′, and can be configured using, for example, a servo motor.
- the ingot 4 is cut using such a band saw cutting device 1 of the present invention
- the ingot 4 is horizontally placed on the cutting table 5 and the blade 2 is rotated by the rotation of the pulleys 3 and 3 ′.
- the ingot 4 is cut by feeding the blade 2 downward from the upper side of the ingot 4 while being driven and guided by the static pressure pads 6, 6 ′ while the blade 2 driven to go around.
- the static pressure pads 6, 6 ′ are moved by the drive units 7, 7 ′, and the movement is controlled by the control unit 8. That is, the controller 8 controls the position of the static pressure pads 6 and 6 ′ during cutting.
- the distance between each static pressure pad and the ingot and the distance between the static pressure pads can be adjusted according to the position of the cutting portion of the ingot during cutting.
- the blade displacement can be stably suppressed from the start of cutting to the end of cutting.
- the movement of the static pressure pads 6 and 6 ′ along the side shape of the ingot 4 can be controlled with the progress of cutting.
- 9 in FIG. 2 represents the shape of the side surface of the ingot 4
- 10 represents the movement locus of the static pressure pad 6 ′.
- the displacement of the blade can be more reliably and stably suppressed.
- the ingot cutting method of the present invention will be described.
- the case where the band saw cutting device 1 of the present invention shown in FIG. 1 is used will be described.
- an endless belt-like blade 2 for cutting the ingot 4 is stretched between the pulleys 3 and 3 ′, and the static pressure pads 6 and 6 ′ are arranged before and after the cutting position of the ingot 4 with respect to the circumferential direction of the blade 2.
- the static pressure pads 6 and 6 ′ are for guiding the coolant from both sides of the blade 2 so that the blade 2 is not displaced with respect to the axial direction of the ingot 4 being cut.
- the ingot 4 is placed horizontally on the cutting table 5, and the position of the ingot 4 is adjusted by the moving mechanism of the cutting table 5 so that the position where the ingot 4 is cut matches the position of the blade 2.
- the blade 2 is driven to rotate by the rotation of the pulley, and the blade 2 that is driven to rotate is guided by the static pressure pads 6, 6 ′, and the blade 2 is sent out relatively upward from above the ingot 4.
- the ingot 4 is cut while moving the static pressure pads 6, 6 ′ in the front-rear direction with respect to the rotating direction of the blade 2.
- the static pressure pads 6 and 6 ′ can be moved along the side shape of the ingot 4 as shown in FIG. .
- the distance d and d ′ between the side surface of the ingot 4 and the static pressure pads 6 and 6 ′ can be moved to be constant, and the distance d and d ′ can be moved to be the same. preferable. In this manner, the displacement of the blade can be more reliably and stably suppressed by moving the static pressure pad.
- the distance between the hydrostatic pads is changed in accordance with the change in cutting resistance caused by the change in the ingot diameter of the cutting portion as the cutting progresses. It can also be moved.
- Other cutting conditions can be the same as in the prior art.
- the speed at which the blade is relatively moved downward can be 25 to 30 mm / min.
- the pressure at which the coolant is jetted can be 0.1 to 0.4 MPa, and the flow rate can be 300 to 2000 cc / min.
- sending the blade relatively downward from above the ingot means sending the blade downward from above the ingot or sending the ingot upward from below the blade. Or do both of these.
- Example 2 Using the band saw cutting apparatus of the present invention as shown in FIG. 1, according to the ingot cutting method of the present invention, a silicon single crystal ingot having a diameter of 300 mm is cut into a sample wafer, the amount of blade displacement during cutting is measured, and the cutting is performed.
- the defective rate of the obtained sample wafer and the life of the blade were evaluated.
- the defect rate represents the rate at which a warp of a size larger than the reference is generated on the wafer due to a large displacement of the blade, and the life of the blade is represented by the number of cuttings.
- the cutting conditions were as follows. A blade having a blade base thickness of 0.5 mm was used.
- the blade feed speed (cutting speed) was 27 mm / min, the pressure at the time of coolant injection was 0.2 MPa, and the flow rate was 2000 cc / min.
- the static pressure pad is moved along the shape of the side surface of the ingot as shown in FIG. 2, and the distances d and d ′ between the side surface of the ingot and the static pressure pad are constant (30 mm) and the distance. d and d ′ were made the same.
- the displacement of the blade was suppressed to 100 ⁇ m or less from the start of cutting to the end of cutting, whereas in the comparative example described later, it shifted between 200 and 300 ⁇ m and was not stable.
- the defect rate of the cut sample wafer was 2%, which was improved compared to 10% of the comparative example described later.
- the life of the blade was improved about 1.3 times as long as about 400 times compared with 300 times of the comparative example described later.
- the displacement of the blade could be stably suppressed, the displacement of the blade could be suppressed sufficiently stably even when the blade feed rate was increased to 30 mm / min, and the cutting speed could be improved by about 10%.
- the band saw cutting device and the ingot cutting method of the present invention can stably suppress the displacement of the blade during cutting, thereby stably maintaining the quality of the cut surface and extending the life of the blade. It was confirmed that the cutting speed could be improved.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
このようなコーン状の端部の切断加工や胴体部を複数のブロックに切断加工する場合には、内周刃スライサー、外周刃スライサーなどが多く用いられてきた。近年のウェーハの大口径化に伴ってバンドソー切断装置も多く使用されるようになってきた(例えば、特許文献1参照)。
図3に示すように、バンドソー切断装置101には切断時にインゴット104を支持するための切断テーブル105が設置されている。切断前において、インゴット104は切断テーブル105上に水平に載置される。また、バンドソー切断装置101には、薄いブレード台金の端部にダイヤモンドの砥粒を糊着してなるブレード砥粒部で構成されるエンドレスベルト状のブレード102がプーリー103、103’間に張設されている。
このようにして切断を重ねていくと、ブレード砥粒部に切断粉末が堆積するなどしてダイヤモンド砥粒が埋もれたり、切断によって砥粒が摩耗或いは脱落してその切断能力が低下してしまう。
近年、バンドソー切断装置に用いられるブレードは、インゴットの切断時における取り代を少なくすることによって製品歩留りを向上させるため、薄型化されたものが使用されるようになってきている。特にこのような薄型化されたブレードを用いた場合、ブレードの変位が起こりやすい。
このブレード102の変位を抑制するために、図3に示すように、バンドソー切断装置101にはブレード102の周回方向に対してインゴット104の切断位置の前後に静圧パッド106、106’が設けられている。静圧パッド106、106’は、一対のパッド部材でブレードを挟み込み、それぞれのパッド部材に設けられた噴出口からクーラントをブレードの両側面に噴出してブレードが切断中のインゴットの軸方向に対して変位しないように案内するものである。
このようなものであれば、ブレードの変位をより確実に安定的に抑制できるものとなる。
このようにすれば、ブレードの変位をより確実に安定的に抑制できる。
一般に、インゴットを切断するバンドソー切断装置にはブレードの変位を抑制するための静圧パッドが設けられている。しかし、このバンドソー切断装置でインゴットを切断しても、切断中にブレードの変位が大きくなってしまうことがある。これにより、切断精度及び切断面の品質の悪化、ブレード寿命の低下、切断速度を向上できないなどの問題を生じる。そのため、ブレードの変位を切断開始から切断終了までに亘って安定的に抑制することが課題となっている。
図1に示すように、本発明のバンドソー切断装置1は、インゴット4を水平に載置するための切断テーブル5、インゴット4を切断するためのエンドレスベルト状のブレード2、ブレード2を周回駆動させるためのプーリー3、3’、ブレード2が切断中のインゴット4の軸方向に対して変位しないように案内する静圧パッド6、6’等を具備している。静圧パッドの材質は、例えば、カーボン材とすることができる。
プーリー3、3’はその回転軸周りに回転可能に構成され、その回転軸が切断テーブル5上に水平に載置されたインゴット4の中心軸に対して垂直になるように配置される。これらプーリー3、3’間にエンドレスベルト状のブレード2がブレード砥粒部を下方に向けるようにして張設される。ブレード2はプーリー3、3’が回転することで周回駆動する。
またここで、特に限定されることはないが、ブレード2をプーリー3、3’間で張り上げる張力を1t以上とすることができる。このようにプーリー3、3’間での張り上げ張力を1t以上とすれば、1軸駆動の場合であっても、ブレード2の周回駆動の方向に関わらず回転中にブレード2にブレが発生するのを防ぐことができる。
切断テーブル5は、インゴット4を切断する位置をブレード2の位置に合わせるように調整する移動機構を有している。
図1(B)に示すように、ブレード2の変位を測定する変位センサ11を設けることができる。
また、本発明のバンドソー切断装置には、図1(A)に示すように、駆動部7、7’と制御部8とが設けられている。
駆動部7、7’は、静圧パッド6、6’をブレード2の周回方向に対して前後方向に移動させるものであり、例えば、LMガイドやボールネジを用いて構成できる。制御部8は駆動部7、7’によって静圧パッド6、6’を移動する際の移動距離及び移動速度を制御するものであり、例えば、サーボモータを用いて構成できる。
このような本発明のバンドソー切断装置であれば、切断中にインゴットの切断部の位置に応じてそれぞれの静圧パッドとインゴットとの距離や静圧パッドの間の距離を調整できるので、インゴットの切断開始から切断終了に亘ってブレードの変位を安定的に抑制できるものとなる。
このように、切断中に静圧パッドを移動制御することで、ブレードの変位をより確実に安定的に抑制できるものとなる。
まず、インゴット4を切断するためのエンドレスベルト状のブレード2をプーリー3、3’間に張設し、静圧パッド6、6’をブレード2の周回方向に対してインゴット4の切断位置の前後に配置する。上記したように、静圧パッド6、6’はブレード2の両側面からクーラントを噴出してブレード2が切断中のインゴット4の軸方向に対して変位しないように案内するものである。
このような本発明のインゴットの切断方法であれば、切断中にインゴットの切断部の位置に応じてそれぞれの静圧パッドとインゴットとの距離や静圧パッドの間の距離を調整できるので、インゴットの切断開始から切断終了に亘ってブレードの変位を安定的に抑制できる。
このように、静圧パッドを移動させることで、ブレードの変位をより確実に安定的に抑制できる。
その他の切断条件としては従来と同様にすることができるが、例えば、ブレードを相対的に下方に送る速度(切断速度)を25~30mm/minとすることができる。また、クーラントを噴出する際の圧力を0.1~0.4MPa、流量を300~2000cc/minとすることができる。
図1に示すような本発明のバンドソー切断装置を用い、本発明のインゴットの切断方法に従って、直径300mmのシリコン単結晶インゴットをサンプルウェーハに切断し、切断中のブレードの変位量を測定し、切断されたサンプルウェーハの不良率、ブレードの寿命を評価した。ここで、不良率はブレードの変位が大きくなることでウェーハに基準以上の大きさのソリが発生した割合を表し、ブレードの寿命は切断した回数で表す。
ここで、切断条件を以下のようにした。ブレードはブレード台金の厚さが0.5mmのものを使用した。ブレードの送り速度(切断速度)を27mm/minとし、クーラント噴出時の圧力を0.2MPa、その流量を2000cc/minとした。切断中には静圧パッドを、図2に示すように、インゴットの側面形状に沿うように移動させ、インゴットの側面と静圧パッドとの距離d、d’が一定(30mm)で、かつ距離dとd’とが同じになるようにした。
また、ブレードの変位を安定して抑制できたことで、ブレードの送り速度を30mm/minまで増加させてもブレードの変位を十分安定的に抑制でき、切断速度を10%程度向上できた。
図3に示すような、本発明のバンドソー切断装置の駆動部及び制御部を有していない従来のバンドソー切断装置を用い、切断中に静圧パッドを移動させずその位置を固定させた以外、実施例と同様な条件でインゴットを切断し、実施例と同様に評価した。
その結果、ブレードの変位量が200~300μm間で不安定に推移し、実施例の100μm以下の結果と比べ悪化していた。また、切断されたサンプルウェーハの不良率は10%と実施例と比べ悪化していた。ブレードの寿命は300回と実施例と比べ少なかった。
また、ブレードの送り速度を30mm/minとして切断したところ、ブレードが変位量が大きくなり過ぎてしまい、目的の品質のサンプルウェーハを得ることができなかった。
Claims (4)
- インゴットを水平に載置する切断テーブルと、プーリー間に張設され、該プーリーの回転によって周回駆動される、前記インゴットを切断するためのエンドレスベルト状のブレードと、該ブレードの周回方向に対して前記インゴットの切断位置の前後にそれぞれ配置され、前記ブレードの両側面からクーラントを噴出して前記ブレードが切断中の前記インゴットの軸方向に対して変位しないように案内する静圧パッドとを具備し、周回駆動された前記ブレードを前記静圧パッドによって案内しながら、前記ブレードを前記インゴットの上方から相対的に下方に送り出すことによって前記インゴットを切断するバンドソー切断装置であって、
さらに、前記静圧パッドを前記ブレードの周回方向に対して前後方向に移動させる駆動部と、該駆動部による前記静圧パッドの移動距離及び移動速度を制御する制御部とを有し、
前記静圧パッドを前記制御部で移動制御しながら前記インゴットを切断するものであることを特徴とするバンドソー切断装置。 - 前記インゴットの切断中における前記静圧パッドの移動を、前記インゴットの側面形状に沿うように制御するものであることを特徴とする請求項1に記載のバンドソー切断装置。
- 切断テーブルにインゴットを水平に載置し、プーリーの回転によって周回駆動される、前記インゴットを切断するためのエンドレスベルト状のブレードを前記プーリー間に張設し、前記ブレードの両側面からクーラントを噴出して前記ブレードが切断中の前記インゴットの軸方向に対して変位しないように案内する静圧パッドを前記ブレードの周回方向に対して前記インゴットの切断位置の前後に配置し、周回駆動された前記ブレードを前記静圧パッドによって案内しながら、前記ブレードを前記インゴットの上方から相対的に下方に送り出すことによって前記インゴットを切断するインゴットの切断方法であって、
前記静圧パッドを前記ブレードの周回方向に対して前後方向に移動させながら前記インゴットを切断することを特徴とするインゴットの切断方法。 - 前記インゴットの切断中における前記静圧パッドの移動を、前記インゴットの側面形状に沿うように行うことを特徴とする請求項3に記載のインゴットの切断方法。
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| Application Number | Priority Date | Filing Date | Title |
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| DE112012004597.1T DE112012004597T5 (de) | 2011-11-24 | 2012-10-15 | Bandsäge-Schneideapparat und Verfahren zum Schneiden eines Ingots |
| KR1020147013449A KR20140094548A (ko) | 2011-11-24 | 2012-10-15 | 밴드 쏘 절단 장치 및 잉곳 절단 방법 |
| US14/351,942 US20140261368A1 (en) | 2011-11-24 | 2012-10-15 | Bandsaw cutting appartus and method for cutting ingot |
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| JP2011256654A JP5660013B2 (ja) | 2011-11-24 | 2011-11-24 | バンドソー切断装置及びインゴットの切断方法 |
| JP2011-256654 | 2011-11-24 |
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| JP (1) | JP5660013B2 (ja) |
| KR (1) | KR20140094548A (ja) |
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| WO (1) | WO2013076905A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104275526A (zh) * | 2013-07-09 | 2015-01-14 | 江苏瑞安特重型机械有限公司 | 一种锯床夹持装置 |
| CN115990955A (zh) * | 2022-12-24 | 2023-04-21 | 西安奕斯伟材料科技股份有限公司 | 用于线切割硅棒的装置、设备、硅片及其制造方法 |
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| JP2015046512A (ja) * | 2013-08-28 | 2015-03-12 | 三菱マテリアル株式会社 | シリコンインゴット切断装置 |
| KR101693344B1 (ko) | 2015-01-15 | 2017-01-05 | 주식회사 엠티아이다이아몬드 | 밴드 쏘 제작방법 |
| KR101797983B1 (ko) | 2015-01-15 | 2017-12-12 | 주식회사 엠티아이다이아몬드 | 밴드 쏘 제조방법 및 그에 따른 밴드 쏘 |
| JP7636983B2 (ja) * | 2021-07-07 | 2025-02-27 | 株式会社マキタ | 携帯用バンドソー |
| CN119388605A (zh) * | 2024-12-06 | 2025-02-07 | 西安奕斯伟材料科技股份有限公司 | 带锯晶棒截断装置和带锯晶棒截断方法 |
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- 2012-10-15 DE DE112012004597.1T patent/DE112012004597T5/de not_active Withdrawn
- 2012-10-15 WO PCT/JP2012/006576 patent/WO2013076905A1/ja not_active Ceased
- 2012-10-15 KR KR1020147013449A patent/KR20140094548A/ko not_active Ceased
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| JP2000334653A (ja) * | 1999-05-28 | 2000-12-05 | Hitachi Cable Ltd | バンドソー型切断方法及び装置 |
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| JP2013107375A (ja) | 2013-06-06 |
| US20140261368A1 (en) | 2014-09-18 |
| KR20140094548A (ko) | 2014-07-30 |
| JP5660013B2 (ja) | 2015-01-28 |
| DE112012004597T5 (de) | 2014-08-21 |
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