WO2014108956A1 - ワイヤソーの運転再開方法 - Google Patents
ワイヤソーの運転再開方法 Download PDFInfo
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- WO2014108956A1 WO2014108956A1 PCT/JP2013/007181 JP2013007181W WO2014108956A1 WO 2014108956 A1 WO2014108956 A1 WO 2014108956A1 JP 2013007181 W JP2013007181 W JP 2013007181W WO 2014108956 A1 WO2014108956 A1 WO 2014108956A1
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- wire
- cutting
- workpiece
- diameter
- resuming
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- 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
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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
- B24B27/0633—Grinders for cutting-off using a cutting wire
Definitions
- the present invention relates to a wire saw that presses and cuts a workpiece such as a semiconductor ingot while supplying slurry to the wire, and more particularly to a method for resuming the operation of the wire saw at the time of wire cutting.
- a wire saw is known as means for cutting a workpiece such as a semiconductor ingot into a wafer.
- a wire saw is known as means for cutting a workpiece such as a semiconductor ingot into a wafer.
- a plurality of cutting wires are wound around a plurality of grooved rollers to form a wire row, the cutting wires are driven at high speed in the axial direction, and slurry is appropriately supplied.
- the workpiece is cut and fed to the wire row so that the workpiece is simultaneously cut at each wire position.
- FIG. 1 shows an outline of an example of a general wire saw.
- a wire 2 for cutting a workpiece W is fed from a wire reel 6 on the supply side and enters a roller 3 with a groove.
- a wire row is formed by winding the wire 2 around the grooved roller 3 about 300 to 500 times. Further, the wire 2 is unwound from the grooved roller 3 and wound on the wire reel 6 'on the collecting side.
- the wire 2 is reciprocated in the wire axis direction at a predetermined travel distance, and a new wire is gradually supplied from the supply side to the recovery side.
- the wire of the wire saw is made of a wire material having high wear resistance and tensile resistance and having high hardness such as a piano wire
- the grooved roller is made of a resin having a predetermined hardness in order to prevent the wire from being damaged.
- the wire may be disconnected during cutting of the workpiece due to wear or fatigue of the wire over time, and cutting of the wafer may not be continued.
- the wire is manually pulled out, or the grooved roller driving device is manually operated so that the broken portion of the wire is in one groove. Pull out to the appropriate outside of the attached roller, and connect the disconnected portions. If the disconnected part cannot be reused, remove the part, replace it with a new line, and connect. Thereafter, a drawing operation is performed in which the connecting portion between the wires is drawn again to a position where the wire is not directly involved in cutting the workpiece.
- Patent Document 2 There are known methods for improving the strength of the wire (for example, refer to Patent Document 2) and for stopping the cutting by detecting a sign of the disconnection with a wire saw in order to solve the problem of the wire disconnection (refer to Patent Document 3). With such a technique, the frequency of wire breakage can be reduced.
- the use load of the wire also increases, and disconnection cannot be avoided completely. Once the disconnection occurs, a groove that cannot be removed by a subsequent process is formed in the wafer cut out immediately after resuming the cutting of the expensive workpiece, resulting in a problem that a large number of defective products are generated.
- the present inventor investigated the details of the cause and found the following. As described above, when the disconnected portions of the wires are connected to each other in the repair process and the connecting portion is pulled out from the cutting position of the workpiece, the wire at the cutting position of the workpiece is replaced with a new line.
- the workpiece cutting allowance is a value obtained by adding three times the average diameter of the slurry to the wire diameter (Non-patent Document 1). Grooves occur in the cut part.
- the present invention has been made in view of the above-described problems, and in cutting a workpiece such as a semiconductor ingot using a wire saw, even if the cutting of the workpiece is interrupted due to a wire breakage, a groove is formed in the cut wafer after the restart of operation. It is an object of the present invention to provide a method for resuming the operation of a wire saw that can suppress the occurrence of the problem and suppress the quality problem of a product wafer.
- a wire is wound around a plurality of grooved rollers, and the wire is reciprocated in the wire axial direction while supplying a new line of the wire from the supply side to the collection side.
- a wire saw that supplies a cutting slurry to the wire, relatively pushes down the workpiece, presses against the reciprocating wire, cuts and feeds the workpiece, and cuts the workpiece into a wafer shape.
- the operation restarting method in the case of resuming the cutting after interrupting the cutting of the work in the middle after being disconnected, and after the interruption of the cutting of the work before the resumption of the cutting of the work.
- the diameter of the wire is reduced by wearing the repaired wire. It is possible to match the diameter of the wire just before the disconnection.
- a dummy workpiece and a holding means for holding the dummy workpiece are provided in the wire saw, and the diameter of the wire at a position where the wire is unwound from the grooved roller to the collecting side is the disconnection.
- the dummy workpiece and the holding means can be removed after the wire is worn by cutting the dummy workpiece with the repaired wire.
- the diameter of the wire can be more easily matched with the diameter of the wire just before the disconnection. Also, in the cutting preparation process, it is not necessary to remove the work that was interrupted in the middle of the cutting from the wire saw, and the relative position of the work with respect to the wire row does not change. Can be prevented.
- the wire length from the position of the wire breakage position at the time of the breakage occurrence to the position where the wire is unwound from the grooved roller to the collection side is detected, and in the cutting preparation step, The wire is positioned so that the position of the broken wire position is the position where the wire is unwound from the grooved roller to the collecting side, and then the new wire having a length equal to or longer than the detected wire length
- the dummy workpiece can be cut so that is supplied and used.
- the length of the new wire to be worn and the cutting time of the dummy workpiece can be easily determined, and the wire diameter can be reliably compared with the wire diameter just before the wire breakage with the minimum necessary process time. Can be matched.
- the diameter of the said wire can be measured with a micrometer or a laser displacement meter. In this way, the diameter of the wire can be easily measured.
- the diameter of the repaired wire at the workpiece cutting position is made to coincide with the diameter of the wire immediately before the disconnection. Since the difference between the diameter of the wire to be used and the diameter before breakage can be eliminated, the generation of grooves in the cut wafer can be suppressed, and the flatness of the wafer can be improved. Thereby, it can suppress that the quality problem of a product wafer arises.
- FIG. 6 It is the schematic which shows an example of a common wire saw. It is a flowchart of the operation resumption method of the wire saw of this invention. It is a figure which shows a mode that a dummy workpiece
- the present invention is not limited to this.
- a wire breaks during the cutting of the workpiece by the wire saw
- a groove is generated in the resumed cutting portion due to the difference between the wire diameter immediately before the breaking and the diameter of the wire after the repair.
- the inventor has intensively studied to solve such problems. As a result, after repairing the wire, it was found that the occurrence of the groove can be suppressed by matching the diameter of the repaired wire at the cutting position of the workpiece with the diameter of the wire immediately before the disconnection, thereby completing the present invention.
- a wire saw 1 includes a wire 2 for cutting a workpiece W, a grooved roller 3 around which the wire 2 is wound, a workpiece feeding mechanism 4 for feeding the workpiece W to be cut relatively downward, and cutting.
- a slurry supply means 5 for supplying slurry to the wire 2.
- the wire 2 is fed out from the wire reel 6 on the supply side and enters the grooved roller 3.
- a wire row is formed by winding the wire 2 around the grooved roller 3 about 300 to 500 times. Further, the wire 2 is unwound from the grooved roller 3 and wound on the wire reel 6 'on the collecting side.
- a wire tension applying mechanism (not shown) for applying tension to the wire 2 is provided between the grooved roller 3 and the wire reels 6 and 6 '.
- the wire 2 is reciprocated in the wire axis direction at a predetermined travel distance.
- the traveling distances of the reciprocating wires in the respective directions are not the same, and the traveling distance in one direction is longer.
- the new wire is gradually supplied from the supply side to the collection side as shown in FIG.
- the workpiece W is held by the workpiece feeding mechanism 4 and fed to the wire 2 positioned relatively below.
- the work feeding mechanism 4 pushes the work W against the wire 2 and cuts and feeds the work W by pushing it down relatively until the wire 2 reaches the contact plate. Then, after the cutting of the workpiece W is completed, the cut workpiece W is pulled out from the wire row by reversing the feeding direction of the workpiece W.
- the wire saw operation resuming method of the present invention is a method of resuming operation when the wire 2 is disconnected and the cutting of the workpiece W is temporarily interrupted in the middle of the operation, and then the cutting is resumed.
- FIGS. 1 First, when the wire breakage occurs, the cutting of the work is interrupted, the work is temporarily retracted from the wire row (FIG. 2A), and the work for removing the broken wire is performed (FIG. 2B). Thereafter, the wire is repaired. Further, the diameter of the wire at the time of occurrence of disconnection is measured ((C) in FIG. 2).
- the position where the wire diameter is measured can be a position P where the wire shown in FIG. 1 is unwound from the grooved roller to the collection side (hereinafter referred to as a collection-side end point).
- the wire breakage point is closer to the wire reel 6 'side than the collection side end point P.
- the broken portions of the wires are connected to each other ((D) in FIG. 2). In this way, the repair work of the wire is facilitated, and it is possible to prevent the wire connecting portion from being used for cutting when the cutting is resumed and affecting the quality of the cut wafer. In this case, when resuming cutting, the reciprocating travel of the wire is started from the direction of the collection side.
- the broken portions of the wires can be connected to each other without drawing the wire to the collection side.
- the wire breakage portions may be connected to each other after the wire is drawn in the direction of the collection side according to the necessity of the wire repair work.
- a cutting preparation step for preparing for restarting the cutting of the interrupted workpiece is performed.
- the diameter of the repaired wire at the cutting position of the workpiece is matched with the diameter of the wire just before the disconnection.
- work correspond to each row
- column is performed. If the wire breakage occurs at the collection side position and the wire breakage parts are connected to each other without pulling the wire to the collection side in the repairing step, the diameter of the repaired wire at the workpiece cutting position is the value immediately before the breakage. It matches the diameter of the wire. If the wire is pulled out to the collection side, the diameter of the repaired wire at the workpiece cutting position matches the diameter of the wire just before the disconnection if the wire is pulled back to the position before pulling out, that is, the position just before the disconnection. Can be made.
- the wire breakage point is drawn out to the collection side as described above, so the workpiece cutting position after resumption
- the wire in contains the new line part. Therefore, in order to make the diameter of the wire coincide with the diameter of the wire immediately before breaking, the wire at the cutting position of the workpiece is worn.
- the wire saw 1 is provided with a dummy workpiece DW and holding means 7 for holding the dummy workpiece DW.
- the holding means 7 can be detachably attached to the workpiece feeding mechanism 4.
- the dummy workpiece can be cut with the wire and the wire can be worn without removing the workpiece whose cutting has been interrupted from the workpiece feeding mechanism 4.
- whether or not the diameter of the wire at the cutting position of the workpiece matches the diameter of the wire immediately before the disconnection can be determined based on the diameter of the wire at the position of the recovery end point P. That is, if the dummy workpiece is cut with a wire so that the diameter of the wire at the position of the collection end point P is the same as that immediately before the disconnection, it is determined that the diameter of the wire at the cutting position of the workpiece matches the diameter of the wire immediately before the disconnection. it can.
- the wire length C from the position of the wire breakage point to the position of the collection end point P at the time of occurrence of the breakage is detected.
- the length of one turn of the wire wound around the plurality of grooved rollers is WN
- the distance from the collection-side end point P in the direction perpendicular to the wire row to the disconnection occurrence position is X (see FIG. 5)
- the wire length C can be determined by WN ⁇ X / D, where D is the column spacing D.
- D is the column spacing D.
- the wire is positioned so that the position of the broken wire portion (connecting portion) of the wire is slightly on the wire reel 6 ′ side from the position of the collection end point P ((E) in FIG. 2). “Slightly closer to the wire reel 6 ′ side than the position of the collection end point P” means that the connecting portion is displaced from the position of the collection end point P.
- the diameter of the wire after repair at the position of the recovery side end point P is measured with a micrometer or a laser displacement meter, and a difference ⁇ Q between this measured value and the wire diameter at the same position at the time of occurrence of the disconnection is calculated.
- the new wire supplied from the supply side during cutting of the workpiece gradually proceeds to the collection side while continuing to reciprocate, and the wire diameter gradually decreases due to wear as it advances to the collection side.
- the diameter of the wire at the collection end point P is about 10% smaller than the diameter of the new line.
- the amount of decrease due to wear of the wire diameter varies depending on the cutting conditions (new wire supply speed, wire average speed, cutting speed, and pressure of the workpiece contacting the wire row). The amount of wear of the wire increases toward the collection side. Therefore, the diameter measured above is larger than the wire diameter at the same position at the time of disconnection occurrence.
- a dummy workpiece and holding means for holding the dummy workpiece are provided on the wire saw (FIG. 2F), and cutting conditions are set (FIG. 2G).
- a new line is supplied while reciprocating the wire under this cutting condition to cut the dummy workpiece, and the wire diameter at the position of the collection-side end point P is worn by the calculated difference ⁇ Q, that is, the wire at this position
- the cutting is continued until the diameter of the wire coincides with the wire diameter at the same position at the time of occurrence of the break (FIG. 2H).
- a cutting condition for obtaining ⁇ Q by cutting a dummy workpiece in advance can be recorded, and this cutting condition can be used in the cutting preparation step.
- the length L of the dummy workpiece, the cutting speed V, the pressure F of the workpiece contacting the wire row are kept constant, the new line supply speed S is changed, the dummy workpiece is cut, and the relationship between ⁇ Q and S is determined. It is possible to record and use the new line supply speed S corresponding to the target ⁇ Q when the dummy workpiece is cut.
- a new wire having a length equal to or longer than the wire length C detected above is supplied and used. This can be achieved by setting the dummy workpiece cutting time T to be equal to or longer than the time determined by the equation C / S.
- the diameter of the wire at the position of the collection end point P is confirmed, and the dummy workpiece and the holding means are removed ((I) in FIG. 2).
- a dummy workpiece a workpiece made of glass, carbon, filler-filled acrylic resin, filler-filled epoxy resin, or filler-filled urethane resin can be used. After carrying out the cutting preparation step as described above, the cutting of the workpiece is resumed ((J) in FIG. 2).
- the diameter of the wire at the position of the collection side end point P at the time of the wire breakage was measured, it was 90% of the new wire.
- the wire was repaired and positioned so that the connecting portion of the wire was at the collection end point P. Thereafter, a dummy workpiece made of an acrylic resin having a thickness of 10 mm, a width of 150 mm, and a length of 360 mm is cut into the holding means shown in FIG. 3, and the diameter of the wire at the position of the collection end point P is 90% of the new line.
- the wire was abraded until it was, and the diameter of the repaired wire at the cutting position of the workpiece was matched with the diameter of the wire just before the break.
- the flatness of the wafer thus cut was evaluated.
- the evaluated wafer was a wafer corresponding to both end faces and the center position of the ingot. The flatness was evaluated by placing the wafer on a horizontal plane and measuring the displacement of one side of the cut surface in the diameter direction (cutting direction).
- FIG. (A) is the result of the wafer on the supply side end surface
- (B) is the result of the wafer at the center
- (C) is the result of the wafer on the recovery side end surface.
- the wafer in any position does not have a steep negative groove at 65 mm where the disconnection occurred, and the flatness is improved compared to the result of the comparative example described later. I understand.
- the obtained wafer had no quality problems as a product.
- FIG. 8 is an enlarged view of a portion where the flatness of the wafer shown in FIG. 6 is broken. As shown in FIG. 8, it was clearly confirmed that the groove was suppressed as compared with the result of the comparative example described later.
- FIG. 7 shows the result of the wafer on the supply side end surface
- (B) shows the result of the wafer on the center
- (C) shows the result of the wafer on the recovery side end surface.
- (B) a central wafer and (C) a wafer on the collection side end face, a sharp groove in the negative direction occurred at 85 mm where disconnection occurred. This groove was so large that it could not be corrected in a subsequent process such as lapping, and the wafer was defective.
- FIG. 8 is an enlarged view of a portion where the flatness of the wafer shown in FIG. 7 is broken. As shown in FIG. 8, it was clearly confirmed that a groove having a size that cannot be repaired in the subsequent process is generated.
- 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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Abstract
Description
図1に示すように、ワイヤソー1は、ワークWを切断するためのワイヤ2が供給側のワイヤリール6から繰り出され、溝付きローラ3に入っている。ワイヤ2がこの溝付きローラ3に300~500回程度巻掛けられることによってワイヤ列が形成される。更に、ワイヤ2は溝付きローラ3から巻出され、回収側のワイヤリール6’に巻き取られる。
ワークWを切断する時には、ワイヤ2を予め定められた走行距離でワイヤ軸方向に往復走行させ、供給側から回収側にワイヤ新線が徐々に供給されていく。
そこで、溝付きローラの複数の溝間のピッチを供給側より回収側の方が狭くなるようにしたものが用いられている(特許文献1)。
本発明者がこの原因についての詳細を調査したところ以下のことが判明した。上記のように、修復処理においてワイヤの断線部同士を連結し、連結部分をワークの切断位置から引出すと、ワークの切断位置におけるワイヤが新線と置き換わることになる。ワークの切断位置における断線直後のワイヤの直径は摩耗により新線の直径より細くなっているので、断線直前のワイヤ直径と新線のワイヤ直径の差異が生じる。一般的にワークの切り代はワイヤ直径にスラリの平均径の3倍を加えた値となることが知られており(非特許文献1)、切断再開後のワークの切り代が増加することにより切断部に溝が発生する。
しかも、ウェーハの直径が大きくなるにつれ不良品の発生による影響が深刻になってきている。
このようにすれば、ワイヤの直径を容易に測定できる。
上記したように、ワイヤソーによるワークの切断中にワイヤが断線した場合、そのワークの切断を再開すると、断線直前のワイヤ直径と修復後のワイヤの直径の差異により再開した切断部に溝が発生するという問題がある。
本発明者はこのような問題を解決すべく鋭意検討を重ねた。その結果、ワイヤを修復した後、ワークの切断位置における修復したワイヤの直径を断線直前のワイヤの直径と一致させることにより、上記溝の発生を抑制できることを見出して本発明を完成させた。
図1に示すように、ワイヤソー1は、ワークWを切断するためのワイヤ2、ワイヤ2を巻掛けした溝付きローラ3、切断するワークWを相対的に下方へと送り出すワーク送り機構4、切断時にワイヤ2にスラリを供給するためのスラリ供給手段5を有している。
ワイヤ2は、供給側のワイヤリール6から繰り出され、溝付きローラ3に入っている。ワイヤ2がこの溝付きローラ3に300~500回程度巻掛けられることによってワイヤ列が形成される。更に、ワイヤ2は溝付きローラ3から巻出され、回収側のワイヤリール6’に巻き取られる。
ワークWを切断する時には、ワイヤ2を予め定められた走行距離でワイヤ軸方向に往復走行させる。この際、往復走行するワイヤのそれぞれの方向への走行距離は同じではなく、片方向の走行距離の方が長くなっている。これにより、ワイヤは往復走行を続けながら長く走行する方向、すなわち図1に示すように供給側から回収側にワイヤ新線が徐々に供給されていく。
まず、ワイヤの断線が発生したらワークの切断を中断し、ワークをワイヤ列から一旦退避させ(図2の(A))、断線したワイヤを取り除く作業を行う(図2の(B))。その後、ワイヤの修復を行う。また、断線発生時点のワイヤの直径を測定する(図2の(C))。ここで、ワイヤ直径を測定する位置は、図1に示すワイヤが溝付きローラから回収側に巻出される位置P(以降、回収側終点と呼ぶ)とすることができる。
ワイヤの断線が回収側の位置で発生し、上記修復工程でワイヤを回収側に引き出すことなくワイヤの断線部同士を連結した場合には、ワークの切断位置における修復したワイヤの直径は断線直前のワイヤの直径と一致している。また、ワイヤを回収側に引き出した場合には、ワイヤを引き出す前の位置、すなわち断線直前の位置に戻して位置決めすればワークの切断位置における修復したワイヤの直径を断線直前のワイヤの直径と一致させることができる。
このとき、ワークの切断位置におけるワイヤの直径が断線直前のワイヤの直径と一致するか否かの判断は、回収側終点Pの位置におけるワイヤの直径に基づいて行うことができる。すなわち、回収側終点Pの位置におけるワイヤの直径が断線直前と同じになるようにワイヤでダミーのワークを切断すれば、ワークの切断位置におけるワイヤの直径が断線直前のワイヤの直径と一致すると判断できる。
上記修復工程において、断線発生時点におけるワイヤの断線箇所の位置から回収側終点Pの位置までのワイヤ長Cを検出しておく。ここで、複数の溝付きローラに巻掛けられたワイヤ1周分の長さをWN、ワイヤ列に垂直な方向の回収側終点Pから断線発生位置までの距離をX(図5参照)、ワイヤ列の間隔Dとすると、上記ワイヤ長CはWN×X/Dで求めることができる。ここで、ワイヤ列の間隔が供給側より回収側の方が狭くなる場合には平均値を用いる。
次に、回収側終点Pの位置における修復後のワイヤの直径をマイクロメーター、又はレーザー変位計で測定し、この測定値と断線発生時点の同位置のワイヤ直径との差ΔQを算出する。
ダミーのワークを切断した後、回収側終点Pの位置におけるワイヤの直径を確認し、ダミーのワーク及び保持手段を取り除く(図2の(I))。
ここで、ダミーのワークとして、ガラス、カーボン、フィラー充填アクリル樹脂、フィラー充填エポキシ樹脂、フィラー充填ウレタン樹脂製のワークを用いることができる。
以上のようにして切断準備工程を実施した後、ワークの切断を再開する(図2の(J))。
図1に示すようなワイヤソーを用い、直径200mm、長さ360mmのシリコンインゴットを切断したところ、上記切り込み位置が65mm、上記距離Xが25mmの位置でワイヤが断線した。そこで、本発明のワイヤソーの運転再開方法に従って以下のようにワークの切断を再開した。
その後、図3に示した保持手段に厚さ10mm、幅150mm、長さ360mmのアクリル系樹脂からなるダミーのワークを切断し、回収側終点Pの位置におけるワイヤの直径が新線の90%になるまでワイヤを摩耗させ、ワークの切断位置における修復したワイヤの直径を断線直前のワイヤの直径と一致させた。
このようにして切断したウェーハの平坦度を評価した。評価したウェーハは、インゴットの両端面、及び中央の位置に相当するウェーハとした。平坦度はウェーハを水平面上に静置し、切断面の片側の面を直径方向(切断方向)に変位を測定することによって評価した。
図1に示すようなワイヤソーを用い、直径200mm、長さ365mmのシリコンインゴットを切断したところ、上記切り込み位置が85mm、上記距離Xが40mmの位置でワイヤが断線した。ワイヤの修復後、ダミーのワークの切断を行うことなく、すなわち、修復したワイヤの直径を断線直前のワイヤの直径と一致させることなく、インゴットの切断を再開し、切断を完了させた。
その結果を図7に示す。実施例と同様、(A)は供給側端面のウェーハ、(B)は中央部のウェーハ、(C)は回収側端面のウェーハの結果である。図7に示すように、(B)中央部のウェーハ及び(C)回収側端面のウェーハにおいて、断線の発生した85mmのところで急峻なマイナス方向への溝が発生した。この溝はラッピング等の後工程で修正不可能ほどの大きさであり、ウェーハは不良品となってしまった。
Claims (5)
- 複数の溝付きローラにワイヤを巻掛け、該ワイヤの新線を供給側から回収側に供給しながら前記ワイヤをワイヤ軸方向に往復走行させ、前記ワイヤに切断用のスラリを供給しつつ、ワークを相対的に押し下げて、往復走行する前記ワイヤに押し当てて切り込み送りし、前記ワークをウェーハ状に切断するワイヤソーの運転において、前記ワイヤが断線して前記ワークの切断を途中で一旦中断した後、該切断を再開する場合の運転再開方法であって、
前記ワークの切断を中断した後、前記ワークの切断を再開する前に、前記断線したワイヤを修復する修復工程と、
前記ワークの切断位置における前記修復したワイヤの直径を前記断線直前のワイヤの直径と一致させる切断準備工程を有することを特徴とするワイヤソーの運転再開方法。 - 前記切断準備工程において、前記ワイヤの断線が前記溝付きローラに巻掛けられた位置、又は前記供給側の位置で発生した場合に、前記修復したワイヤを摩耗させることによってその直径を前記断線直前のワイヤの直径と一致させることを特徴とする請求項1に記載のワイヤソーの運転再開方法。
- 前記切断準備工程において、ダミーのワークと該ダミーのワークを保持する保持手段を前記ワイヤソーに設け、前記ワイヤが前記溝付きローラから回収側に巻出される位置における前記ワイヤの直径が前記断線前と同じになるように、前記修復したワイヤで前記ダミーのワークを切断することによって前記ワイヤを摩耗させた後、前記ダミーのワーク及び保持手段を取り除くことを特徴とする請求項2に記載のワイヤソーの運転再開方法。
- 前記修復工程において、前記断線発生時点における前記ワイヤの断線箇所の位置から前記ワイヤが前記溝付きローラから回収側に巻出される位置までのワイヤ長を検出し、
前記切断準備工程において、前記ワイヤの断線箇所の位置が、前記ワイヤが前記溝付きローラから回収側に巻出される位置となるように前記ワイヤを位置決めし、その後、前記検出したワイヤ長以上の長さの前記ワイヤの新線が供給されて使用されるように前記ダミーのワークを切断することを特徴とする請求項3に記載のワイヤソーの運転再開方法。 - 前記ワイヤの直径をマイクロメーター、又はレーザー変位計で測定することを特徴とする請求項1乃至請求項4のいずれか1項に記載のワイヤソーの運転再開方法。
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