JP2010194672A - Method of grinding workpiece - Google Patents

Method of grinding workpiece Download PDF

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JP2010194672A
JP2010194672A JP2009042141A JP2009042141A JP2010194672A JP 2010194672 A JP2010194672 A JP 2010194672A JP 2009042141 A JP2009042141 A JP 2009042141A JP 2009042141 A JP2009042141 A JP 2009042141A JP 2010194672 A JP2010194672 A JP 2010194672A
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grinding
grinding wheel
workpiece
wheel
vitrified
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Naohiro Matsutani
直宏 松谷
Naoya Sukegawa
直哉 介川
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Disco Corp
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Disco Abrasive Systems Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To further improve grinding productivity by eliminating the need for dressing of a grinding wheel during grinding of a workpiece such as a semiconductor wafer. <P>SOLUTION: In a method of grinding the workpiece by operating the grinding wheel 213b with respect to the workpiece held on a chuck table 20 while supplying a grinding fluid from a grinding fluid supply means 22 to the grinding wheel 213b, the grinding wheel 213b is a vitrified grinding wheel obtained by bonding together diamond abrasive grains with a vitrified bond, and the grinding fluid supplied from the grinding fluid supply means 22 is a silicon dioxide solution that facilitates self-sharpening action of the grinding wheel by eroding the vitrified bond. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、半導体ウェーハ等の被加工物の面を研削する方法に関するものである。   The present invention relates to a method for grinding a surface of a workpiece such as a semiconductor wafer.

半導体ウェーハ等の被加工物の面を研削する場合においては、粗研削、仕上げ研削という2段階の研削が行われている。   In the case of grinding the surface of a workpiece such as a semiconductor wafer, two-stage grinding, rough grinding and finish grinding, is performed.

粗研削用には、粒径が比較的大きい砥粒がビトリファイドボンドによって結合されて構成され、砥粒保持力が高く研削能力が高いビトリファイド砥石が用いられている。一方、仕上げ研削用には、粒径が比較的小さい砥粒がレジンボンドによって結合され、砥粒保持力が比較的弱く被加工物に対する当たりが柔軟なレジンボンド砥石が用いられている。   For rough grinding, a vitrified grindstone is used in which abrasive grains having a relatively large particle diameter are bonded by vitrified bonds, and has a high abrasive grain retention and high grinding ability. On the other hand, for finish grinding, a resin bond grindstone is used in which abrasive grains having a relatively small particle diameter are bonded by a resin bond, the abrasive grain holding force is relatively weak, and the contact with a workpiece is flexible.

ところが、レジンボンド砥石で仕上げ研削を行うと、砥粒がレジンボンド内に押し込まれるため、頻繁にドレッシング(目立て)をしなければならず、生産性が低いという問題がある。そこで、仕上げ研削用砥石のボンド剤としてビトリファイドボンドを使用し、ビトリファイドボンドに微細な気孔を備えることにより、ビトリファイドボンドを使用しつつも被加工物に対する当たりをソフトとした仕上げ研削用砥石が提案されている(例えば特許文献1参照)。   However, when finish grinding is performed with a resin bond grindstone, since the abrasive grains are pushed into the resin bond, dressing (sharpening) must be performed frequently, resulting in low productivity. Therefore, by using vitrified bond as a bonding agent for finish grinding wheels, and by providing fine pores in the vitrified bond, a grinding wheel for finishing grinding that has soft contact with the workpiece while using vitrified bond has been proposed. (For example, refer to Patent Document 1).

特開2006−1007号公報JP 2006-1007 A

しかし、気孔を備えたビトリファイドボンド砥石を使用すると、ドレッシングの回数を低減することはできるものの、定期的にドレッシングを行わなければならないことに変わりはなく、依然として生産性改善の余地がある。   However, when a vitrified bond grindstone having pores can be used, the number of dressings can be reduced, but the dressing must be performed regularly, and there is still room for improvement in productivity.

そこで、本発明が解決しようとする課題は、研削砥石のドレッシングを不要として研削の生産性をより向上させることである。   Accordingly, the problem to be solved by the present invention is to improve the productivity of grinding by eliminating the need for dressing a grinding wheel.

本発明は、被加工物を保持するチャックテーブルと、チャックテーブルに保持された被加工物を研削する研削砥石を備えた研削手段と、研削砥石に研削液を供給する研削液供給手段とを少なくとも備えた研削装置を用い、研削液供給手段から研削砥石に研削液を供給しながらチャックテーブルに保持された被加工物に対して研削砥石を作用させて研削を行う被加工物の研削方法に関するもので、研削砥石は、ダイヤモンド砥粒をビトリファイドボンドで固めたビトリファイド砥石であり、研削液供給手段から供給される研削液は、ビトリファイドボンドを浸食して研削砥石の自生発刃作用を促進する二酸化珪素溶融液であることを特徴とする。   The present invention includes at least a chuck table for holding a workpiece, a grinding means including a grinding wheel for grinding the workpiece held on the chuck table, and a grinding fluid supply means for supplying a grinding fluid to the grinding wheel. The present invention relates to a method for grinding a workpiece, in which a grinding wheel is applied to a workpiece held on a chuck table while the grinding fluid is supplied from the grinding fluid supply means to the grinding wheel using the grinding apparatus provided. The grinding wheel is a vitrified grinding stone in which diamond abrasive grains are hardened with vitrified bond, and the grinding fluid supplied from the grinding fluid supply means erodes the vitrified bond and promotes the self-generated blade action of the grinding wheel. It is a melt.

二酸化珪素溶融液としては、例えば、希フッ酸または水酸化アルカリ溶液を使用することができる。   As the silicon dioxide melt, for example, dilute hydrofluoric acid or an alkali hydroxide solution can be used.

本発明では、希フッ酸、KOH、NaOH等の二酸化珪素溶融液を研削液として使用することにより、研削液が、研削砥石の結合剤であるビトリファイドボンドを浸食して自生発刃作用を促進するため、実質的にドレッシングが不要となり、生産性が向上する。   In the present invention, by using a silicon dioxide melt such as dilute hydrofluoric acid, KOH, or NaOH as the grinding fluid, the grinding fluid erodes the vitrified bond, which is a binder of the grinding wheel, and promotes the self-generated blade action. Therefore, dressing is substantially unnecessary and productivity is improved.

ウェーハ及び保護部材の一例を示す斜視図である。It is a perspective view which shows an example of a wafer and a protection member. 研削装置の一例を示す斜視図である。It is a perspective view which shows an example of a grinding device. 研削ホイールの一例を示す斜視図である。It is a perspective view which shows an example of a grinding wheel. 研削ホイールの一部を拡大して示す断面図であるIt is sectional drawing which expands and shows a part of grinding wheel. ウェーハを研削する状態を示す斜視図である。It is a perspective view which shows the state which grinds a wafer. 研削により研削痕が形成されたウェーハを示す斜視図である。It is a perspective view which shows the wafer in which the grinding trace was formed by grinding. 研削砥石に研削液が供給される状態を略示的に示す断面図である。It is sectional drawing which shows schematically the state by which a grinding fluid is supplied to a grinding wheel.

図1に示すウェーハWの表面W1には、ストリートSに区画されて複数のデバイスDが形成されており、このウェーハWの裏面W2を研削して所望の厚さとした後に、ストリートSを切断することにより、個々のデバイスDに分割される。   A plurality of devices D are formed on the surface W1 of the wafer W shown in FIG. 1 and divided into streets S. After the back surface W2 of the wafer W is ground to a desired thickness, the streets S are cut. Thus, the device is divided into individual devices D.

図1に示すように、表面W1にはデバイスDを保護するための保護部材1が貼着される。そして、例えば図2に示す研削装置2を使用して裏面W2の研削を行う。   As shown in FIG. 1, the protective member 1 for protecting the device D is stuck on the surface W1. Then, for example, the back surface W2 is ground using the grinding apparatus 2 shown in FIG.

研削装置2は、ウェーハWを保持して回転及び水平方向に移動可能なチャックテーブル20と、チャックテーブル20に保持された被加工物を研削する研削手段21と、研削手段21に研削液を供給する研削液供給手段22と、研削手段21を垂直方向に研削送りする研削送り手段23とを備えている。   The grinding apparatus 2 holds a wafer W and can rotate and move horizontally, a chuck table 20, a grinding means 21 that grinds a workpiece held on the chuck table 20, and supplies a grinding fluid to the grinding means 21. Grinding fluid supply means 22 for grinding, and grinding feed means 23 for grinding and feeding the grinding means 21 in the vertical direction.

研削手段21は、垂直方向の軸心を有するスピンドル210と、スピンドル210を回転駆動するモータ211と、スピンドル210の下端に形成されたホイールマウント212と、ホイールマウント212に装着された研削ホイール213とから構成される。   The grinding means 21 includes a spindle 210 having a vertical axis, a motor 211 that rotationally drives the spindle 210, a wheel mount 212 formed at the lower end of the spindle 210, and a grinding wheel 213 attached to the wheel mount 212. Consists of

研削手段21のスピンドル210には、研削液供給手段22が連結されている。研削液供給手段22は、研削液を貯留する供給源220と、研削液の流量を調整するバルブ221とから構成される。供給源220に貯留される研削液は、二酸化珪素溶融液、例えば、pHが5〜6の希フッ酸(弗化水素酸)や、pH10〜12のKOH、NaOH等の水酸化アルカリ溶液である。   A grinding fluid supply means 22 is connected to the spindle 210 of the grinding means 21. The grinding fluid supply means 22 includes a supply source 220 that stores the grinding fluid and a valve 221 that adjusts the flow rate of the grinding fluid. The grinding fluid stored in the supply source 220 is a silicon dioxide melt, for example, dilute hydrofluoric acid (hydrofluoric acid) having a pH of 5 to 6, or an alkali hydroxide solution such as KOH or NaOH having a pH of 10 to 12. .

研削送り手段23は、垂直方向の軸心を有するボールネジ230と、ボールネジ230と平行に配設された一対のガイドレール231と、ボールネジ230に連結されボールネジ230を回転駆動するパルスモータ232と、内部のナットがボールネジ230に螺合すると共に側部がガイドレール231に摺接し研削手段21を支持して昇降する昇降部233とから構成される。研削送り手段23は、パルスモータ232がボールネジ230を回転駆動し、これに伴い昇降部233がガイドレール231にガイドされて昇降することにより、研削手段21を昇降させることができる。   The grinding feed means 23 includes a ball screw 230 having a vertical axis, a pair of guide rails 231 arranged in parallel to the ball screw 230, a pulse motor 232 connected to the ball screw 230 and rotationally driving the ball screw 230, The nut is screwed onto the ball screw 230, and the side portion is configured to include a lifting portion 233 that slides on the guide rail 231 and supports the grinding means 21 to move up and down. The grinding feed means 23 can raise and lower the grinding means 21 by the pulse motor 232 rotating and driving the ball screw 230, and the raising and lowering part 233 being guided by the guide rail 231.

図3に示すように、研削ホイール213は、リング状の基台213aと、基台213aの下面に固着された複数の研削砥石213bとから構成され、基台213aには、図4に示すように、垂直方向に貫通する研削液流通孔213cが複数形成されている。研削砥石213bは、ダイヤモンド砥粒をビトリファイドボンドで固めたビトリファイド砥石であり、ダイヤモンド砥粒を保持する力が強く、研削能力が高い。このビトリファイド砥石は、例えば、二酸化珪素を93%、酸化カリウムを7%の割合で混合させたガラス質のビトリファイドボンドを結合材としてダイヤモンド砥粒と結合させ、高温焼成することにより形成される。   As shown in FIG. 3, the grinding wheel 213 is composed of a ring-shaped base 213a and a plurality of grinding wheels 213b fixed to the lower surface of the base 213a. In addition, a plurality of grinding fluid circulation holes 213c penetrating in the vertical direction are formed. The grinding wheel 213b is a vitrified grindstone in which diamond abrasive grains are hardened by vitrified bonds, and has a strong force for holding the diamond abrasive grains and high grinding ability. This vitrified grindstone is formed, for example, by bonding with diamond abrasive grains using a vitreous vitrified bond in which silicon dioxide is mixed at a ratio of 93% and potassium oxide at a ratio of 7% and baking at a high temperature.

図4に示すように、研削液流通孔213cにおける研削液の出口部においては、研削砥石213bに向けて傾斜する斜面213dが形成されており、研削液流通孔213cから流出した研削液が、斜面213dに沿って研削砥石213bに導かれる構成となっている。   As shown in FIG. 4, a slope 213d that slopes toward the grinding wheel 213b is formed at the outlet of the grinding fluid in the grinding fluid circulation hole 213c, and the grinding fluid that has flowed out of the grinding fluid circulation hole 213c It is configured to be guided to the grinding wheel 213b along 213d.

表面W1に保護部材1が貼着されたウェーハWは、図5に示すように、保護部材1側が研削装置2のチャックテーブル20に保持され、裏面W2が露出した状態となる。そして、チャックテーブル20の水平方向の移動によりウェーハWが研削ホイール213の下方に移動した後、チャックテーブル20を例えば300RPMの回転速度で回転させてウェーハWを回転させる。そして、スピンドル20を例えば6000RPMの回転速度で回転させ、その回転に伴い研削砥石213bが回転した状態で、研削手段21を例えば1μm/sの送り速度で下降させ、回転する研削砥石213bをウェーハWの裏面W2に接触させることにより、裏面W2を研削する。   As shown in FIG. 5, the wafer W having the protective member 1 adhered to the front surface W1 is held by the chuck table 20 of the grinding apparatus 2 on the protective member 1 side, and the back surface W2 is exposed. Then, after the wafer W moves below the grinding wheel 213 due to the horizontal movement of the chuck table 20, the chuck table 20 is rotated at a rotational speed of, for example, 300 RPM to rotate the wafer W. Then, the spindle 20 is rotated at a rotation speed of, for example, 6000 RPM, and the grinding wheel 21 is lowered at a feed speed of, for example, 1 μm / s while the grinding wheel 213b is rotated along with the rotation. The back surface W2 is ground by bringing it into contact with the back surface W2.

研削時は、研削砥石213bの回転軌跡が常にウェーハWの回転中心を通るようにする。そうすると、図6に示すように、ウェーハWの中心から外周に向けて研削痕W3が形成され、裏面W2を均一な面に加工することができる。   At the time of grinding, the rotation locus of the grinding wheel 213b always passes through the rotation center of the wafer W. Then, as shown in FIG. 6, grinding marks W3 are formed from the center of the wafer W to the outer periphery, and the back surface W2 can be processed into a uniform surface.

このようにして行う研削中は、図7に示すように、研削液供給手段22からスピンドル内部及び図4に示した研削液流通孔213cを通じて研削砥石213bに対して、常に研削液3が供給され、研削砥石213bとウェーハWの裏面W2との接触部位が冷却される。   During grinding performed in this way, as shown in FIG. 7, the grinding fluid 3 is always supplied from the grinding fluid supply means 22 to the grinding wheel 213b through the inside of the spindle and the grinding fluid circulation hole 213c shown in FIG. The contact portion between the grinding wheel 213b and the back surface W2 of the wafer W is cooled.

この研削液3は、二酸化珪素溶融液であるため、研削砥石213bとウェーハWの裏面W2との接触部位を冷却するだけでなく、ビトリファイドボンドを浸食する作用も有している。そして、ビトリファイドボンドが浸食されることにより、研削砥石213bの自生発刃作用が促進されるため、研削を続けても研削砥石213bの研削能力が低下しない。したがって、ドレッシングが不要となり研削の生産性が向上する。   Since the grinding liquid 3 is a silicon dioxide melt, it not only cools the contact portion between the grinding wheel 213b and the back surface W2 of the wafer W, but also has an action of eroding the vitrified bond. Since the vitrified bond is eroded, the self-generated blade action of the grinding wheel 213b is promoted, so that the grinding ability of the grinding wheel 213b does not decrease even if grinding is continued. Therefore, dressing is unnecessary and the productivity of grinding is improved.

W:ウェーハ
W1:表面 S:ストリート D:デバイス
W2:裏面
W3:研削痕
1:保護部材
2:研削装置
20:チャックテーブル
21:研削手段
210:スピンドル 211:モータ 212:ホイールマウント
213:研削ホイール
213a:基台 213b:研削砥石 213c:研削液流通孔 213d:斜面
22:研削液供給手段
220:供給源 221:バルブ
23:研削送り手段
230:ボールネジ 231:ガイドレール 232:パルスモータ 233:昇降部
3:研削液
W: Wafer W1: Front surface S: Street D: Device W2: Back surface W3: Grinding mark 1: Protection member 2: Grinding device 20: Chuck table 21: Grinding means 210: Spindle 211: Motor 212: Wheel mount 213: Grinding wheel 213a : Base 213b: Grinding wheel 213c: Grinding fluid flow hole 213d: Slope 22: Grinding fluid supply means 220: Supply source 221: Valve 23: Grinding feed means 230: Ball screw 231: Guide rail 232: Pulse motor 233: Lifting unit 3 : Grinding fluid

Claims (2)

被加工物を保持するチャックテーブルと、該チャックテーブルに保持された被加工物を研削する研削砥石を備えた研削手段と、該研削砥石に研削液を供給する研削液供給手段とを少なくとも備えた研削装置を用い、該研削液供給手段から該研削砥石に研削液を供給しながら該チャックテーブルに保持された被加工物に対して該研削砥石を作用させて研削を行う被加工物の研削方法であって、
該研削砥石は、ダイヤモンド砥粒をビトリファイドボンドで固めたビトリファイド砥石であり、
該研削液供給手段から供給される研削液は、該ビトリファイドボンドを浸食して該研削砥石の自生発刃作用を促進する二酸化珪素溶融液である
被加工物の研削方法。
A chuck table for holding a workpiece, a grinding means including a grinding wheel for grinding the workpiece held on the chuck table, and a grinding fluid supply means for supplying a grinding fluid to the grinding wheel are provided. A method of grinding a workpiece using a grinding device to perform grinding by applying the grinding wheel to the workpiece held on the chuck table while supplying the grinding fluid to the grinding wheel from the grinding fluid supply means Because
The grinding wheel is a vitrified grindstone in which diamond abrasive grains are hardened with vitrified bonds,
A grinding method for a workpiece, which is a silicon dioxide melt, in which the grinding fluid supplied from the grinding fluid supply means erodes the vitrified bond and promotes the self-sharpening action of the grinding wheel.
前記二酸化珪素溶融液は、希フッ酸または水酸化アルカリ溶液である
請求項1に記載の被加工物の研削方法。
The method for grinding a workpiece according to claim 1, wherein the silicon dioxide melt is dilute hydrofluoric acid or an alkali hydroxide solution.
JP2009042141A 2009-02-25 2009-02-25 Method of grinding workpiece Pending JP2010194672A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018062051A (en) * 2016-10-14 2018-04-19 株式会社ディスコ Processing method
US10809105B2 (en) 2017-07-05 2020-10-20 Disco Corporation Measuring instrument and processing apparatus
JP2021115645A (en) * 2020-01-23 2021-08-10 株式会社ミズホ Vitrified super-finished grindstone

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05285826A (en) * 1992-04-14 1993-11-02 Nippon Steel Corp Grinding and polishing method
JPH08257915A (en) * 1995-03-23 1996-10-08 Honda Motor Co Ltd Method for recovering super abrasives from grinding wheel piece of vitrified grinding wheel
JP2008221353A (en) * 2007-03-09 2008-09-25 Ricoh Co Ltd Polishing device and method of manufacturing same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05285826A (en) * 1992-04-14 1993-11-02 Nippon Steel Corp Grinding and polishing method
JPH08257915A (en) * 1995-03-23 1996-10-08 Honda Motor Co Ltd Method for recovering super abrasives from grinding wheel piece of vitrified grinding wheel
JP2008221353A (en) * 2007-03-09 2008-09-25 Ricoh Co Ltd Polishing device and method of manufacturing same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018062051A (en) * 2016-10-14 2018-04-19 株式会社ディスコ Processing method
US10809105B2 (en) 2017-07-05 2020-10-20 Disco Corporation Measuring instrument and processing apparatus
JP2021115645A (en) * 2020-01-23 2021-08-10 株式会社ミズホ Vitrified super-finished grindstone
JP7340254B2 (en) 2020-01-23 2023-09-07 株式会社ミズホ Vitrified super finishing whetstone

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