JP2010260118A - Method of grinding cast piece - Google Patents

Method of grinding cast piece Download PDF

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JP2010260118A
JP2010260118A JP2009111194A JP2009111194A JP2010260118A JP 2010260118 A JP2010260118 A JP 2010260118A JP 2009111194 A JP2009111194 A JP 2009111194A JP 2009111194 A JP2009111194 A JP 2009111194A JP 2010260118 A JP2010260118 A JP 2010260118A
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slab
grinding
rotating grindstone
cast piece
reaction force
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JP5748943B2 (en
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Hiroki Honda
裕樹 本田
Kenichi Haba
健一 羽場
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Nippon Steel Nisshin Co Ltd
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Nisshin Steel Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of grinding a cast piece in which, when the cast piece formed by continuous casting is ground by a rotary grinding wheel, the rotary grinding wheel is not slipped from a ground surface. <P>SOLUTION: When the cast piece is ground along edges 30b and 30c of the cast piece 30 while tilting a rotational axis 32 of the rotary grinding wheel 31 relative to these edges 30b and 30c, the direction of a reaction force R in a moving direction exerted from a portion of the cast piece 30 during grinding is oriented inward of the cast piece 30 with respect to a side surface 31a located downward of the moving direction of the rotary grinding wheel 31. The inward reaction force R relative to the cast piece 30 is achieved by setting an acute angle as an angle α formed between the rotational axis 32 extending outward of the cast piece 30, and the edges 30b and 30c of the cast piece 30 located downward in the moving direction of the rotary grinding wheel 31. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、連続鋳造で形成される鋳片を回転砥石で研削する鋳片の研削方法に関する。   The present invention relates to a slab grinding method in which a slab formed by continuous casting is ground with a rotating grindstone.

種々の製品の素材として用いられる金属板は、一般的に、原料を溶解し、溶湯を鋳造して鋳片とし、当該鋳片を圧延して製造される。金属板の一種である鋼板の場合、その鋳片は連続鋳造法で製造されることが多い。連続鋳造法で製造される鋳片の表面には、モールドパウダーの噛み込み、気泡介在物、引き抜き時の引っ掻き疵などの表面欠陥を生じることがある。これらの表面欠陥が生じた状態で熱間圧延すると、圧延製品にまで欠陥が残る。表面欠陥を有する圧延鋼帯は、手入れをして欠陥が除去されるか、または欠陥の無い部分のみが製品化されるので、能率低下や歩留低下を来たす。したがって、鋳片の段階で、欠陥を有する部分を局部的に研削するか、または欠陥の深さに応じて欠陥を有する面の全体を研削するなどして、欠陥が除去されている。   A metal plate used as a raw material for various products is generally manufactured by melting raw materials, casting a molten metal into a slab, and rolling the slab. In the case of a steel plate which is a kind of metal plate, the slab is often manufactured by a continuous casting method. On the surface of a slab manufactured by a continuous casting method, surface defects such as biting of mold powder, bubble inclusions, and scratches during drawing may occur. When hot rolling is performed in a state where these surface defects are generated, the defects remain even in the rolled product. Rolled steel strips having surface defects are either cared for and the defects are removed, or only the parts without defects are commercialized, resulting in reduced efficiency and yield. Therefore, in the slab stage, the defect is removed by locally grinding the part having the defect or grinding the entire surface having the defect according to the depth of the defect.

図３は、従来鋳片の研削に用いられている研削装置１の概要を示す。研削装置１は、レール２上を移動可能な台車部３と、台車部３の上でレール２に直交する方向に移動可能な横行部４と、回転砥石５を鋳片６に対して圧下する圧下部７と、運転室８と、を含む。鋳片６は、固定架台９の上に載置され、台車部３および横行部４によって所望の位置に移動される回転砥石５で研削される。従前、鋳片６の研削は、オペレーターによる手動操作で行われていた。オペレーターは、研削装置１に設けられる運転室８に搭乗し、運転室８から鋳片６の表面にある欠陥の位置および状態を観察し、観察結果に応じて手動操作で回転砥石５を欠陥部分に移動し、研削していた。しかし、手動操作では能率が低く、また省力が望まれることから、鋳片の研削が自動化されるに至っている。鋳片の自動研削では、研削されるべき平面をたとえば二次元座標で形状認識し、当該平面上における回転砥石の移動経路を設定し、その経路に従って回転砥石の移動を制御して自動研削する。鋳片の形状を認識して自動研削する先行技術として、所定位置から鋳片までの距離を計測することで形状認識して研削する方法、また、回転砥石の近くに設けるセンサーで研削面を認識しながら研削する方法などがある（たとえば、特許文献１、特許文献２参照）。   FIG. 3 shows an outline of a grinding apparatus 1 conventionally used for grinding a slab. The grinding device 1 presses down a trolley 5 that is movable on a rail 2, a traversing portion 4 that is movable on the trolley 3 in a direction perpendicular to the rail 2, and a rotating grindstone 5. The incline 7 and the cab 8 are included. The slab 6 is placed on the fixed mount 9 and is ground by the rotating grindstone 5 that is moved to a desired position by the cart unit 3 and the traversing unit 4. Conventionally, grinding of the slab 6 has been performed manually by an operator. An operator gets on the operator's cab 8 provided in the grinding apparatus 1, observes the position and state of defects on the surface of the slab 6 from the operator's cab 8, and manually operates the rotating grindstone 5 according to the observation results. Moved to and was grinding. However, since manual operation has low efficiency and labor saving is desired, slab grinding has been automated. In automatic slab grinding, a plane to be ground is recognized by, for example, two-dimensional coordinates, a movement path of the rotating grindstone on the plane is set, and the movement of the rotating grindstone is controlled according to the path to perform automatic grinding. As a prior art that recognizes the shape of the slab and automatically grinds it, the method of grinding by recognizing the shape by measuring the distance from the predetermined position to the slab, and the grinding surface is recognized by the sensor provided near the rotating wheel There are methods such as grinding (see, for example, Patent Document 1 and Patent Document 2).

図４は、図３に示す研削装置１を用いて鋳片６の研削面６ａ上で回転砥石５を移動させる研削パス設定の一例を示す。なお、研削面６ａ上を回転砥石が実際に往復移動するパスの回数は、数十パスに及ぶが、図４では説明の便宜上簡略化して６パスで示す。図４に示すように、鋳片６の研削は、鋳片６の縁６ｂ，６ｃに対して、回転砥石５の回転軸線１０が傾斜するようにして行われることが多い。研削で形成される研削目を鋳片６の長手方向に対して斜めにすることによって、鋳片６の圧延で研削目に起因するグラインダスリーバー疵を防止するためである。   FIG. 4 shows an example of a grinding pass setting for moving the rotating grindstone 5 on the grinding surface 6a of the slab 6 using the grinding apparatus 1 shown in FIG. Note that the number of passes that the rotary grindstone actually reciprocates on the grinding surface 6a reaches several tens of passes, but in FIG. 4, the number of passes is simplified and shown as six passes. As shown in FIG. 4, the slab 6 is often ground so that the rotation axis 10 of the rotating grindstone 5 is inclined with respect to the edges 6 b and 6 c of the slab 6. This is because the grinding lines formed by grinding are inclined with respect to the longitudinal direction of the slab 6 so as to prevent grind three bar due to grinding at the rolling of the slab 6.

研削面６ａ上での回転砥石５の移動は、次のように行われる。回転砥石５は、鋳片６の縁６ｂ，６ｃに対して平行に幅縁６ｄの近くまで移動すると、幅縁６ｄに対して平行に幅方向移動１１を行い、再び縁６ｂ，６ｃに対して平行に折り返し移動する。鋳片６の縁６ｂ，６ｃに対して回転砥石５の回転軸線１０が傾斜するようにして、縁６ｂに沿って開始パス１２を研削する場合、また縁６ｃに沿って最終パス１３を研削する場合、特許文献１や特許文献２のように形状認識していたとしても、回転砥石５が研削面６ａの外に脱落することがある。   The movement of the rotating grindstone 5 on the grinding surface 6a is performed as follows. When the rotating grindstone 5 moves to the vicinity of the width edge 6d in parallel to the edges 6b and 6c of the slab 6, it performs a widthwise movement 11 in parallel to the width edge 6d and again to the edges 6b and 6c. Move back in parallel. When the starting path 12 is ground along the edge 6b so that the rotation axis 10 of the rotating grindstone 5 is inclined with respect to the edges 6b and 6c of the slab 6, the final path 13 is ground along the edge 6c. In this case, even if the shape is recognized as in Patent Document 1 or Patent Document 2, the rotating grindstone 5 may fall out of the grinding surface 6a.

特開平０７−１３６９２９号公報Japanese Patent Laid-Open No. 07-136929 特開平０８−２５７９００号公報Japanese Patent Laid-Open No. 08-257900

回転砥石が脱落すると、脱落で生じた研削異常部分の手直し、研削面上へ復帰させるための時間損失、また砥石の割砕による砥石交換の時間損失、甚だしくは、周辺機器を損傷した場合にその修復に多大な時間を要するという問題がある。   If the rotating whetstone falls off, the grinding loss caused by dropping off will be repaired, the time lost to return to the grinding surface, the time loss of wheel replacement due to grinding of the whetstone, or if the peripheral equipment is damaged There is a problem that it takes a lot of time to repair.

本発明の目的は、鋳片の縁に沿い、かつ縁に対して回転砥石の回転軸線が傾斜するようにして研削する場合、研削面から回転砥石が脱落することがない鋳片の研削方法を提供することである。   An object of the present invention is to provide a method for grinding a slab along the edge of the slab, and when the grinding wheel is ground so that the rotation axis of the rotary wheel is inclined with respect to the edge, the rotary wheel does not fall off from the grinding surface. Is to provide.

本発明は、連続鋳造で形成される鋳片を回転砥石で研削する鋳片の研削方法において、
鋳片の縁に沿い、かつ縁に対して回転砥石の回転軸線が傾斜するようにして研削する場合、
回転砥石の移動方向下流側の側面に対して、鋳片の研削中の部分から作用する反力の方向が鋳片の内向きになるように研削することを特徴とする鋳片の研削方法である。 The present invention is a method for grinding a slab in which a slab formed by continuous casting is ground with a rotating grindstone,
When grinding along the edge of the slab and with the axis of rotation of the rotating grindstone inclined relative to the edge,
The slab grinding method is characterized in that grinding is performed so that the direction of the reaction force acting from the portion of the slab during grinding is inward of the slab against the side surface on the downstream side in the moving direction of the rotating grindstone. is there.

また本発明は、連続鋳造で形成される鋳片を回転砥石で研削する鋳片の研削方法において、
鋳片の縁に沿い、かつ縁に対して回転砥石の回転軸線が傾斜するようにして研削する場合、
鋳片の外方へ延びる回転軸線と、回転砥石の移動方向下流側の鋳片の縁と、の成す角が鋭角になるように研削することを特徴とする鋳片の研削方法である。 The present invention also relates to a method for grinding a slab in which a slab formed by continuous casting is ground with a rotating grindstone.
When grinding along the edge of the slab and the axis of rotation of the rotating grindstone is inclined with respect to the edge,
The slab grinding method is characterized in that grinding is performed so that an angle formed by a rotation axis extending outward of the slab and an edge of the slab downstream in the moving direction of the rotating grindstone is an acute angle.

本発明によれば、回転砥石の移動方向下流側の側面に対して鋳片の研削中の部分から作用する反力の方向が鋳片の内向きになるので、回転砥石が研削面の外へ脱落することを防止することができる。   According to the present invention, the direction of the reaction force acting from the portion of the slab that is being ground with respect to the side surface on the downstream side in the moving direction of the rotatory wheel is inward of the slab, so that the rotating grindstone goes out of the grinding surface. It can be prevented from falling off.

また本発明によれば、鋳片の外方へ延びる回転軸線と回転砥石の移動方向下流側の鋳片の縁との成す角が鋭角になるようにして研削する。このことで、回転砥石の移動方向下流側の側面に対して鋳片の研削中の部分から作用する反力の方向を、鋳片の内向きにすることができるので、上記の発明と同一の効果を奏することができる。   Further, according to the present invention, grinding is performed such that the angle formed between the rotation axis extending outward of the slab and the edge of the slab on the downstream side in the moving direction of the rotating grindstone becomes an acute angle. As a result, the direction of the reaction force acting from the portion of the slab that is being ground with respect to the side surface on the downstream side in the moving direction of the rotating grindstone can be made inward of the slab. There is an effect.

本発明の実施の形態である鋳片の研削方法の概要を示す図である。It is a figure which shows the outline | summary of the grinding method of the slab which is embodiment of this invention. 図１に示す鋳片の研削方法による研削の状態を詳細に示す図である。It is a figure which shows the state of grinding by the grinding method of the slab shown in FIG. 1 in detail. 従来鋳片の研削に用いられている研削装置１の概要を示す外観図である。It is an external view which shows the outline | summary of the grinding apparatus 1 conventionally used for grinding of slab. 図３に示す研削装置１を用いて鋳片６の研削面６ａ上で回転砥石５を移動させる研削パス設定の一例を示す図である。It is a figure which shows an example of the grinding pass setting which moves the rotary grindstone 5 on the grinding surface 6a of the slab 6 using the grinding apparatus 1 shown in FIG.

図１は、本発明の実施の形態である鋳片の研削方法の概要を示す。また図２は、図１に示す鋳片の研削方法による研削の状態を詳細に示す。鋳片の研削方法は、連続鋳造で形成される鋳片３０の研削面３０ａを回転砥石３１で研削する方法であり、鋳片３０の縁３０ｂ，３０ｃに沿い、かつ縁３０ｂ，３０ｃに対して回転砥石３１の回転軸線３２が傾斜するようにして研削する場合に用いられる。   FIG. 1 shows an outline of a slab grinding method according to an embodiment of the present invention. FIG. 2 shows the state of grinding by the slab grinding method shown in FIG. 1 in detail. The slab grinding method is a method in which the grinding surface 30a of the slab 30 formed by continuous casting is ground with the rotating grindstone 31, and along the edges 30b and 30c of the slab 30 and with respect to the edges 30b and 30c. It is used when grinding so that the rotation axis 32 of the rotating grindstone 31 is inclined.

鋳片の研削方法の特徴は、回転砥石３１の矢符３３，３４で示す移動方向下流側の側面３１ａに対して、鋳片３０の研削中の部分３５から作用する移動方向反力Ｒの方向が鋳片３０の内向きになるように研削することである。なお、鋳片３０の研削中の部分３５とは、以下の部分をいう。回転砥石３１を移動させて研削する場合、鋳片３０の既に研削された部分３６と、これから研削されようとする部分３７と、の境界で段差部が形成される。この段差部で、回転砥石３１の移動方向下流側の側面３１ａで鋳片３０が研削されている部分３５をいう。当該部分３５を研削段差面３５と呼ぶことにする。   The slab grinding method is characterized by the direction of the moving direction reaction force R acting from the portion 35 during grinding of the slab 30 on the side surface 31a on the downstream side in the moving direction indicated by the arrows 33 and 34 of the rotating grindstone 31. Is to grind the slab 30 inward. Note that the portion 35 during grinding of the slab 30 refers to the following portion. When the rotary grindstone 31 is moved for grinding, a stepped portion is formed at the boundary between the already ground portion 36 of the slab 30 and the portion 37 to be ground. This step portion refers to a portion 35 where the slab 30 is ground on the side surface 31a on the downstream side in the moving direction of the rotating grindstone 31. The portion 35 will be referred to as a grinding step surface 35.

鋳片３０の外方へ延びる回転軸線３２と、回転砥石３１の移動方向下流側の縁３０ｂ，３０ｃとの成す角度αを鋭角にすることで、研削段差面３５から回転砥石３１の側面３１ａに対して作用する移動方向反力Ｒの方向を、鋳片３０の内向きにすることができる。鋳片３０の縁３０ｂ，３０ｃに沿い、かつ縁３０ｂ，３０ｃに対して回転砥石３１の回転軸線３２が傾斜するようにして研削する場合、移動方向反力Ｒの方向を鋳片３０の内向きにすることで、回転砥石３１は、鋳片３０の内向きに押されて、研削面３０ａの外へ脱落することが防止される。   By making the angle α formed by the rotation axis 32 extending outward of the slab 30 and the edges 30b, 30c downstream in the moving direction of the rotating grindstone 31 from the grinding step surface 35 to the side surface 31a of the rotating grindstone 31. The direction of the moving direction reaction force R acting on the slab 30 can be inward. When grinding is performed along the edges 30b and 30c of the slab 30 so that the rotation axis 32 of the rotary grindstone 31 is inclined with respect to the edges 30b and 30c, the direction of the moving direction reaction force R is inward of the slab 30. By doing so, the rotating grindstone 31 is pushed inward of the slab 30 and is prevented from falling out of the grinding surface 30a.

前述したように、鋳片の縁に沿い、かつ回転砥石の回転軸線が縁に対して傾斜するようにして研削する場合、鋳片の形状を認識した上で回転砥石を移動させたとしても、回転砥石が研削面の外に脱落することがある。これは、図１および図２の設定とは逆に、研削段差面から回転砥石の側面に対して作用する移動方向反力Ｒの方向が鋳片の外向きになる場合に起こることが判明した。   As described above, when grinding along the edge of the slab and the rotation axis of the rotating grindstone is inclined with respect to the edge, even if the rotating grindstone is moved after recognizing the shape of the slab, The rotating wheel may fall out of the grinding surface. Contrary to the setting of FIG. 1 and FIG. 2, this has been found to occur when the direction of the moving reaction force R acting on the side surface of the rotating grindstone from the grinding step surface is directed outward of the slab. .

研削砥石３１の脱落を防止するには、研削段差面３５から研削砥石３１の側面３１ａに対して作用する移動方向反力Ｒの方向が必ず鋳片３０の内向きになるように、設定しなければならない。移動方向反力Ｒの方向を鋳片３０の内向きにする手段は、特に制約されない。鋳片３０の外方へ延びる回転軸線３２と、回転砥石３１の移動方向下流側の縁３０ｂ，３０ｃとの成す角度αが鋭角になるように、回転砥石３１の移動方向を限定することで、移動方向反力Ｒの方向が鋳片３０の内向きになるようにしてもよい。また、研削装置における回転砥石３１の支持部を鉛直線まわりに任意の角度に角変位できる構成とし、支持部を介して回転砥石３１を鉛直線まわりに角変位させることで、移動方向反力Ｒの方向が鋳片３０の内向きになるようにしてもよい。   In order to prevent the grinding wheel 31 from falling off, it must be set so that the direction of the reaction force R acting on the side surface 31a of the grinding wheel 31 from the grinding step surface 35 is always inward of the slab 30. I must. The means for making the direction of the moving direction reaction force R inward of the slab 30 is not particularly limited. By limiting the moving direction of the rotating grindstone 31 so that the angle α formed by the rotation axis 32 extending outward of the slab 30 and the edges 30b, 30c on the downstream side in the moving direction of the rotating grindstone 31 becomes an acute angle, The direction of the moving direction reaction force R may be inward of the slab 30. Further, the support portion of the rotating grindstone 31 in the grinding apparatus can be angularly displaced around the vertical line at an arbitrary angle, and the rotational grindstone 31 is angularly displaced around the vertical line via the support portion, thereby moving direction reaction force R The direction may be inward of the slab 30.

なお、回転砥石３１で鋳片３０を研削する際、回転砥石３１の矢符３８で示す回転方向の逆方向にも反力Ｓが作用する。便宜上反力Ｓを周方向反力Ｓと呼ぶ。周方向反力Ｓは、開始パスのときは鋳片３０の内向きで、脱落防止に寄与する。しかし、周方向反力Ｓは、最終パスのときに鋳片３０の外向きで、脱落を促すことになる。回転砥石３１の回転駆動系にクラッチを設け、開始パスと最終パスとの回転方向を逆にして、周方向反力Ｓを常に内向きすることで、回転砥石３１の脱落防止を確実にすることができる。ただし、反力の大きさは、Ｒ＞Ｓであり、脱落防止に対する影響力は、回転砥石３１の側面に対する移動方向反力Ｒの方が、周方向反力Ｓよりも大きい。したがって、クラッチを設けて周方向反力Ｓの向きを変えるまでもなく、移動方向反力Ｒの向きを鋳片３０の内向きにすることで、回転砥石脱落防止の目的を達成することが可能である。   When grinding the slab 30 with the rotating grindstone 31, the reaction force S also acts in the reverse direction of the rotating direction indicated by the arrow 38 of the rotating grindstone 31. For convenience, the reaction force S is referred to as a circumferential reaction force S. The circumferential reaction force S is inward of the slab 30 during the start pass, and contributes to prevention of falling off. However, the circumferential reaction force S is directed outwardly from the slab 30 during the final pass and prompts dropping. A clutch is provided in the rotational drive system of the rotating grindstone 31, and the rotational direction of the start pass and the final pass is reversed, and the circumferential reaction force S is always directed inward to ensure that the rotating grindstone 31 is prevented from falling off. Can do. However, the magnitude of the reaction force is R> S, and the influence force on drop-off prevention is greater in the movement direction reaction force R against the side surface of the rotating grindstone 31 than in the circumferential direction reaction force S. Therefore, it is possible to achieve the purpose of preventing the rotating whetstone from falling off by providing the clutch and changing the direction of the circumferential reaction force S to the inward direction of the slab 30. It is.

１ 研削装置
３０ 鋳片
３１ 回転砥石
３２ 回転軸線
３５ 研削段差面 DESCRIPTION OF SYMBOLS 1 Grinding device 30 Slab 31 Rotating grindstone 32 Rotating axis 35 Grinding step surface

Claims (2)

連続鋳造で形成される鋳片を回転砥石で研削する鋳片の研削方法において、
鋳片の縁に沿い、かつ縁に対して回転砥石の回転軸線が傾斜するようにして研削する場合、
回転砥石の移動方向下流側の側面に対して、鋳片の研削中の部分から作用する反力の方向が鋳片の内向きになるように研削することを特徴とする鋳片の研削方法。 In the slab grinding method of grinding a slab formed by continuous casting with a rotating grindstone,
When grinding along the edge of the slab and with the axis of rotation of the rotating grindstone inclined relative to the edge,
A method for grinding a slab, characterized in that grinding is performed so that a direction of a reaction force acting from a portion of the slab during grinding is directed inward of the slab with respect to a side surface on the downstream side in the moving direction of the rotating grindstone. 連続鋳造で形成される鋳片を回転砥石で研削する鋳片の研削方法において、
鋳片の縁に沿い、かつ縁に対して回転砥石の回転軸線が傾斜するようにして研削する場合、
鋳片の外方へ延びる回転軸線と、回転砥石の移動方向下流側の鋳片の縁と、の成す角が鋭角になるように研削することを特徴とする鋳片の研削方法。 In the slab grinding method of grinding a slab formed by continuous casting with a rotating grindstone,
When grinding along the edge of the slab and with the axis of rotation of the rotating grindstone inclined relative to the edge,
A method for grinding a slab, characterized in that grinding is performed so that an angle formed by a rotation axis extending outward of the slab and an edge of the slab downstream in the moving direction of the rotating grindstone is an acute angle.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012091302A (en) * 2010-10-28 2012-05-17 Noritake Co Ltd Method and device for chamfering grinding for billet

Citations (5)

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JPS6330207A (en) * 1986-07-24 1988-02-08 川崎製鉄株式会社 Automatic sag remover for end surface of steel piece
JPH04278917A (en) * 1991-03-07 1992-10-05 Seiko Epson Corp Production of liquid crystal display device
JP2002219638A (en) * 2001-01-25 2002-08-06 Miyagawa Kogyo Kk Method and device for machining edge
JP2002346890A (en) * 2001-05-23 2002-12-04 Internatl Business Mach Corp <Ibm> Grinding device and grinding method
JP2009196037A (en) * 2008-02-21 2009-09-03 Nippon Steel Corp Grinder and grinding control method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6330207A (en) * 1986-07-24 1988-02-08 川崎製鉄株式会社 Automatic sag remover for end surface of steel piece
JPH04278917A (en) * 1991-03-07 1992-10-05 Seiko Epson Corp Production of liquid crystal display device
JP2002219638A (en) * 2001-01-25 2002-08-06 Miyagawa Kogyo Kk Method and device for machining edge
JP2002346890A (en) * 2001-05-23 2002-12-04 Internatl Business Mach Corp <Ibm> Grinding device and grinding method
JP2009196037A (en) * 2008-02-21 2009-09-03 Nippon Steel Corp Grinder and grinding control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012091302A (en) * 2010-10-28 2012-05-17 Noritake Co Ltd Method and device for chamfering grinding for billet

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