201238715 六、發明說明： 【發明所屬之技術領域】 本發明是關於適合用於稀土類燒結磁鐵的切斷之超硬 合金台板外周切斷刃及其製造方法。 【先前技術】 在稀土類永久磁鐵（燒結磁鐵）的切斷加工，實施了 內周切斷或鏈式切割等的各種方法。其中利用外周刃所進 行的切斷加工是最廣泛使用的切斷方法。該方法的特徵爲 ’切斷機的價格便宜：使用超硬刃的話切割量沒有比該方 式更大的；被加工物的尺寸精度好；加工速度也比較快等 等；作爲量產性優異的加工方法，廣泛利用於稀土類燒結 磁鐵的切斷。 作爲用於稀土類永久磁鐵的切斷之外周刃，在日本特 開平9-174441號公報、日本特開平10-175171號公報、日 本特開平1 0- 1 75 1 72號公報等，揭示有：在超硬合金台板 的外周部，以苯酚樹脂、鍍Ni等來固定鑽石磨粒或CBN 磨粒等的技術。藉由在台板使用超硬合金，與習知的合金 工具鋼或高速度鋼相比，讓台板的機械強度提升，結果可 讓加工切斷精度提升、利用以使用薄刃的切割量減少讓被 加工物的良率提升、利用高速加工而減少加工成本。 以該方式使用超硬合金台板的外周刃，雖然顯示了較 習知的外周刃更優異的切斷及加工性能，可是來自市場方 面的減少成本的需求沒有止境，希望開發出能達到更高精 -3- 201238715 度且更高速的加工的高性能切斷磨石β 〔先前技術文獻〕 〔專利文獻〕 〔專利文獻1〕日本特開平9_174441號公報 〔專利文獻2〕日本特開平10475^號公報 〔專利文獻3〕日本特開平1〇_175172號公報 〔專利文獻4〕日本特開2〇〇5_193358號公報 〔專利文獻5〕曰本特開平7_2〇7254號公報 〔專利文獻6〕日本特許第2942989號公報 〔專利文獻7〕日本特開2005_219169號公報 〔專利文獻8〕國際公開96/23630號刊物 〔專利文獻9〕日本特開2009-172751號公報 【發明內容】· 〔發明欲解決的課題〕 本申請人曾提出：在環狀的超硬合金台板的外周部以 苯酚樹脂等的樹脂來固定鑽石磨粒的技術、或在超硬合金 台板的外周部，以具有適當楊氏模量的金屬結合材，來固 定鑽石磨粒或cBN磨粒等的技術（日本特開2009-1 7275 1 號公報）。 用於切斷稀土類燒結磁鐵的外周切斷刃，是由切割刃 部與台板的兩個部分所構成。藉由將佔了該外周切斷刃的 大半部分的台板，替換成高剛性的超硬合金，讓機械強度 -4 - 201238715 提升，與之前將合金工具鋼或高速度鋼作爲台板的外周切 斷刃相比，更提升了切斷加工的精度。除了該超硬合金台 板之外，藉由將結合材替換成具有適當楊氏模量的金屬， 使外周切斷刃全體的機械強度提升，與之前將苯酚樹脂或 聚醯亞胺樹脂作爲磨粒結合材的樹脂結合劑的外周切斷刃 相比，更提升加工精度，且薄刃化導致材料良率提升，切 斷速度的高速化導致加工成本的減低，可達到這樣三種高 性能化。 並且關於超硬合金外周切斷刃的製造，是在台板的外 周緣部附近形成磁場，該磁場，作用於預先以磁性體塗層 的磨粒皮膜而使皮膜磁化，藉此使磨粒吸引於台板外周部 ，藉由在該狀態進行電鍍來固定磨粒之外周切斷刃的製造 方法，藉此則可減少超硬合金外周切斷刃的製造成本。 藉由上述技術所提供的超硬合金台板外周切斷刃，雖 然是顯示高性能的外周切斷刃，而在稀土類燒結磁鐵的切 斷加工，會有因爲傾斜地切斷磁鐵或在磁鐵的切斷面留下 外周切斷刃的切割痕跡等而讓尺寸精度惡化的情況。具體 來說，使用：外徑80〜200mm、厚度0.1〜1.0mm、內孔 的直徑30〜80 mm的超硬合金台板外周切斷刃，進行每單 位時間的切削體積爲200mm3/min以上的高速、高負荷切 斷加工時，會有尺寸公差在50ym以上的情況。在尺寸精 度惡化的情況，則需要增加在磁鐵將切斷面精密硏磨的拋 光加工等的步驟，而需要在外周切斷刃實施使用磨石的修 整處理或變更切斷條件。 -5- 201238715 這種情形，例如對於軛部或磁鐵的餘隙 的線性馬達或硬碟VCM (音頻線圈馬達）等 磁鐵需要同時達到：包含切斷面的平面度的 減低生產成本的情況，會成爲妨礙。 本發明鑑於上述情形，其目的爲提供超 周切斷刃，能加工：具有高尺寸精度的稀土 並且提供能以低成本來製造超硬合金台板外 法。 〔用以解決課題的手段〕 將稀土類燒結磁鐵傾斜切斷的現象，認 切斷刃的刀鋒形狀沒有左右對稱，刃部朝容 切進、或當將外周切斷刃安裝於加工機時刃 。而在磁鐵留下切割痕跡的現象，是藉由上 切斷磁鐵的外周切斷刃，因爲在切斷途中急 向，之前的切斷面與新產生的切斷面的接合 接，藉由成爲落差而產生的情形。 在切斷中外周切斷刃的行進方向急遽改 如刀鋒的局部因爲任何原因產生變形或脫落 刃部的前端形狀急遽改變的情況，爲了讓外 給速度較在切割刃部的硏磨速度更快，外周 變形，因爲該變形而在外周切斷力產生的內 周切斷刃從被加工物受到的力（外力）更大 加變形的力解除的情況，在切斷中產生的漿 要求嚴密管理 ，在所加工的 高尺寸精度與 硬合金台板外 類燒結磁鐵， 周切斷刃的方 爲是因爲外周 易切削的方向 部裝反所導致 述原因而傾斜 遽改變行進方 處不順暢地連 變的情形，例 的情況，切割 周切斷刃的進 切斷刃的刀鋒 力，變得較外 ，在對刀鋒施 液或來自系統 -6- 201238715 外的異物堵塞於切割槽，藉此妨礙外周切斷刃的行進的情 況等所產生。於是，爲了消除在這種狀況產生的切割痕跡 ，讓切割刃部的前端形狀不劇烈改變，且即使在切斷中有 讓刀鋒的行進方向改變的力量施加的情況，也讓切割刃部 某程度變形而讓切斷面滑順地連接的方式很有效。 在藉由電鍍或無電解電鍍將磨粒固定於台板而形成切 割刃部的外周切斷刃，是使用有某程度的粒徑的粒子作爲 磨粒，所以所固定的磨粒，在磨粒與磨粒之間，以及在磨 粒與台板之間，只有一部分接觸，以電鍍並未將其之間的 間隙完全埋住。因此，在切割刃部，即使在電鍍後，也存 在有間隙，也就是與切割刃部表面連通的空隙》 對切斷中的外周切斷刃的負荷較少的情況，即使有這 些間隙，藉由切削中所受到的力也不會產生很大的變形， 仍能進行高精度的切斷，可是在進行讓超硬合金台板變形 的高負荷切斷的狀況，就可能讓局部刀鋒變形或脫落》爲 了防止刀鋒的變形或脫落，提高刀鋒強度的方法很有效， 而在切割刃部，如後述，能變形將切斷面滑順地連接的彈 性也是必要的’不易變形而只是高強度則無法因應。 因此，本發明者們，爲了達成上述目的而仔細硏究， 針對同時達到高強度與彈性的切割刃部的構造、與切割刃 部的機械性質加以硏究，發現利用在上述磨粒與磨粒之間 、磨粒與台板之間存在的間隙，在該間隙使熱可塑性樹脂 熔融含浸而凝固，或含浸液體狀的熱硬化性樹脂組成物使 其硬化的切割刃部很有效，形成有這種切割刃部的超硬合 201238715 金台板外周切斷刀，對於切斷加工的磁鐵的尺寸精度的提 升很有效，而熱可塑性樹脂的熔融與含浸與凝固、或液體 狀的熱硬化性樹脂組成物的含浸與硬化這樣的方法，對於 外周切斷刃的高精度且廉價製造很有效，而達成本發明。 本發明，第一要提供一種超硬合金台板外周切斷刃， 在以楊氏模量450〜700GPa的超硬合金形成，外徑80〜 200 mm，內徑30〜80 mm，厚度0.1〜1.0mm的圓形環狀薄 板的台板的外周緣部上，具有切割刃部； 上述切割刀部，包含有：預先塗層磁性體而成的鑽石 磨粒及/或cBN磨粒、將上述磨粒間及上述磨粒與台板之 間連結的藉由電鍍或無電解電鍍所形成的金屬或合金、含 浸於上述磨粒間及上述磨粒與台板之間的熔點爲3 5 0 °C以 下的熱可塑性樹脂、或使含浸於上述磨粒間及上述磨粒與 台板之間的硬化溫度爲3 5 0 °C以下的液體狀的熱硬化性樹 脂組成物硬化的熱硬化性樹脂。 作爲所提供的上述外周切斷刃的較佳型態，提供上述 含浸的樹脂爲由：丙烯酸樹脂、環氧樹脂、苯酚樹脂、聚 醯胺樹脂、聚醯亞胺樹脂、及這些樹脂的變性樹脂中所選 出的一種以上，以及提供上述含浸的樹脂的帕松比（ Poisson ratio)爲 0.3 〜0.48。 作爲所提供的上述外周切斷刃的較佳型態，上述台板 的飽和磁化量爲40kA/m(0.05T)以上。 作爲所提供的上述外周切斷刃的較佳型態，上述磨粒 的平均粒徑爲10〜3 00 //m，且上述磨粒的質量磁化率；fg 201238715 爲〇_2以上》 本發明，第二要提供一種超硬合金台板外周切斷刃的 製造方法，接近於：以楊氏模量450〜700GPa的超硬合金 形成，外徑 80〜200mm，內徑 30〜80mm，厚度 0.1〜 1.0mm的圓形環狀薄板的台板的外周緣部，來配設永久磁 鐵， 藉由該永久磁鐵形成的磁場，將預先塗層有磁性體而 成的鑽石磨粒及/或cBN磨粒，磁性吸引固定於上述台板 的外周緣部附近， 在保持該吸引固定的狀態，藉由電鍍或無電解電鍍， 將上述磨粒間及上述磨粒與台板之間連結，使磨粒固定於 上述台板外周端部，而形成切割刃部， 對上述磨粒間及上述磨粒與台板之間存在的空隙，含 浸熔點爲3 5 0 °C以下的熱可塑性樹脂、或含浸硬化溫度爲 3 5 0°C以下的液體狀的熱硬化性樹脂組成物而使其硬化》 作爲所提供的上述製造方法的較佳型態，提供上述含 浸的樹脂爲由：丙烯酸樹脂、環氧樹脂、苯酚樹脂、聚醯 胺樹脂、聚醯亞胺樹脂、及這些樹脂的變性樹脂中所選出 的一種以上，以及提供上述含浸的樹脂的帕松比（Poisson ratio )爲 0.3 〜0.48。 作爲所提供的上述製造方法的較佳型態，上述台板的 飽和磁化量爲40kA/m ( 0.05T )以上。 作爲所提供的上述製造方法的較佳型態，上述磨粒的 平均粒徑爲10〜300/zm，且上述磨粒的質量磁化率xg爲 201238715 0.2以上。 作爲所提供的.上述製造方法的較佳型態，藉由上述永 久磁鐵’在從台板的外周端起算1 〇mm以內的空間，形成 8kA/m以上的磁場。 〔發明效果〕 藉由採用本發明的超硬合金台板外周切斷刃，僅以切 斷操作將被加工物的尺寸高精度地完成，能省略切斷後的 後處理步驟’所以能廉價地提供具有高尺寸精度的稀土類 磁鐵。 本發明的製造方法，能具有優異的成本績效（cost performance)來製造該超硬合金台板外周切斷刃。 【實施方式】 本發明的外周切斷刃，例如，如第1圖所示，在圓形 薄板的台板1 0的外周緣部上，形成有切割刃部20，該切 割刃部20，以藉由電鍍或無電解電鍍所形成的金屬或合金 (金屬結合材）結合著鑽石磨粒及/或cBN磨粒。 上述台板10是圓形薄板（在中央部形成有內孔12的 環狀的薄板），其所具有的尺寸爲：厚度爲0.1〜1.0mm ，較佳爲0.2〜0.8mm，外徑爲80〜200mm，較佳爲1〇〇〜 180mm，內孔的直徑（內徑）爲30〜80mm，較佳爲40〜 70mm » 上述台板ίο的圓形薄板，如第1圖，具備有中央的 -10- 201238715 內孔與外側的圓周部。本發明，在說明外周切斷刃的尺寸 時所使用的「徑方向」及「軸方向」，是相對於該圓形薄 板的中心來使用，所謂厚度爲軸方向尺寸，長度（高度） 爲徑方向尺寸。同樣地，「內側」或「內方」或者「外側 」或「外方」也是相對於圓形薄板的中心或外周切斷刃的 旋轉軸來使用。 作成在厚度0.1〜1.0mm且外徑200mm以下的範圍， 是因爲可製作精度較佳的台板、以及能尺寸精度優異地長 時間將稀土類燒結磁鐵等的被加工物（工件）切斷。厚度 小於0 · 1 m m的話，不管外徑如何，容易產生較大的翘曲， 所以不易製作精度較佳的台板，而超過1 .Onirn的話，切斷 加工量會變大。而將外徑作爲0 200mm以下，是在現行的 超硬合金的製造技術及加工技術可製作的尺寸的緣故。針 對內孔的直徑，是配合加工機的切斷刃安裝軸的粗細度， 爲 0 30 〜φ 80mm。 台板的材質爲超硬合金，例如將 WC、TiC、MoC、 NbC、TaC、Cr3C2等的屬於週期表IVB、VB、VIB族的金 屬的碳化物粉末，使用Fe、Co、Ni、Mo、Cu、Pb、Sn或 其合金，進行燒結結合的合金較佳；其中尤其代表性的使 用 WC-Co 類 ' WC-Ti 類、C-Co 類、WC-TiC-TaC-Co 類， 使用楊氏模量爲450〜700GPa者。在這些超硬合金，要具 有能進行電鏟的程度的電傳導性、或能藉由鈀觸媒等賦予 電傳導性者較佳。針對利用鈀觸媒等賦予電傳導性，能利 用例如在對ABS樹脂電鍍時所使用的導電化處理劑等的 -11 - 201238715 習知的技術。 台板的磁性特性，雖然爲了藉由磁性吸引將磨粒固定 於台板，飽和磁化量越大越好，可是假設即使飽和磁化量 較小，如後述藉由控制磁鐵位置或磁場的強度’就能將預 先以磁性體塗層的磨粒磁性吸引於台板，所以只要 40kA/m(0.05T)以上即可。 台板的飽和磁化量，是從預定厚度的台板切出5mm 見方的測試試料，使用振動樣品測磁儀（Vibrating Sample Magnetometer (VSM))，在 24 〜25 °C 之間測定 磁化曲線（4πΙ — Η )，能將第一象限的磁化値的上限作爲 台板的飽和磁化量。 台板外周部，爲了提高與以金屬結合材固定磨粒所形 成的切割刃部的結合強度，藉由實施倒45度角（倒C角 )或倒圓角（倒R角）也有效。藉由實施這些倒角處理， 即使在當調整刃厚時誤將台板與磨粒層的交界硏磨過頭的 情況，藉由讓金屬結合材留在交界處，仍可防止切割刃部 脫落。倒角的角度或量，能加工的範圍取決於台板的厚度 ’所以因應於所使用的台板的厚度與固定的磨粒的平均粒 徑來決定。 作爲形成切割刃部的磨粒，雖然是使用鑽石磨粒及/ 或cBN磨粒’而這些磨粒需要預先藉由磁性體塗層。藉由 磁性體所塗層的磨粒的大小或硬度，是因應目的來決定。 例如’也可分別單獨使用鑽石（天然鑽石、工業用合 成鑽石）磨粒、cBN (立方晶氮化硼）磨粒，也可使用鑽 -12- 201238715 石磨粒與cBN磨粒的混合磨粒。而也可因應於被加工物， 將各磨粒從單結晶或多結晶中，分別單獨或混合使用等， 來調I卩劈裂谷易度（解理（Cleavage)傾向）。並且在這 些磨粒表面，噴濺程度的Fe，Co、Cr等的金屬， 作爲提高與後述的塗層磁性體的結合強度的方法也很有效 〇 磨粒的大小，雖然也根據台板的厚度，而平均粒徑爲 10〜300#m較佳g平均粒徑小於i〇ym的話，磨粒與磨 粒的間隙變小，所以切斷中容易產生堵塞，切斷能力會降 低，平均粒徑超過300/zm的話，可能會產生讓磁鐵的切 斷面變粗糙等的缺點。在該範圍，考慮切斷加工性或使用 壽命等，使用單獨或幾個特定大小的磨粒組合也可以》 用來塗層磨粒的磁性體，例如爲了即使在飽和磁化量 較低的超硬合金等的台板也能在短時間磁性吸引，且以電 鍍法固定時不會脫落，讓其磨粒的質量磁化率Xg爲0.2 以上，最好爲0.39以上，將從Ni、Fe及Co選出的一種 金屬，從這些金屬選出的兩種以上所構成的合金、或從這 些金屬或合金的一種以及從P及Μη所選出的一種或兩種 的合金，藉由噴濺 '電鍍、無電解電鍍等的習知的方法· 塗層成讓皮膜的厚度爲磨粒徑的〇·5〜100%’最好爲2〜 8 0%。 磨粒的磁化率是取決於塗層的磁化體的磁化率與塗層 時的厚度，所以爲了藉由磨粒的大小而得到所需要的吸引 力，則需要針對磁性體的種類加以考慮’例如以無電解鎳 -13- 201238715 磷電鍍方式提高磷含有率而磁化率較小者， 理，也可提高某程度磁化率，以在磁化率較 施磁化率較大的塗層的方式，也能以不同磁化 層化，所以配合狀況在適度的範圍內進行調節 如此使磨粒的質量磁化率；t g爲0.2以 0.39以上的話，藉由接近後述的台板外周緣部 場，迅速地將磨粒磁化，所以以台板與永久磁 夾具主體）所形成的後述的第3圖的間隙64 ，大致均等地將磨粒磁性吸引。如果磨粒的質: 小於0.2的話，磨粒不會被上述間隙順利地吸 中磨粒會脫落等而無法形成磨粒層（切割刃部 磨粒層產生孔部等，結果可能會減弱磨粒層的 磨粒的質量強化率，能用以下的方法測定 外徑08mm、髙度5mm左右，內徑的 內，讓磨粒儘可能薄且均勻地廣佈成1〜2層 從容器取出，測定磨粒的重量，將其再次回到 上面覆蓋熔點50 °C左右的石躐，將全體放入 加熱。接著’在石蠟熔化的狀態蓋住容器將其 ，該試料在溫度24〜25 °C，用VSM(振動樣 Vibrating Sample Magnetometer)，來測定初 4πΙ — Η )。從曲線的反曲點的傾斜度求出該初 微分磁化率，除以試料重量則成爲磨粒的質| 。磁場以Ni標準試料來校正，磨粒的密度使 密度來測定。 :由實施熱處 ，的塗層上實 率的塗層複 〇 上，最好爲 :所形成的磁 鐵保持具（ 的全部部分 量磁化率；f g 引，在電鍍 )，或者在 機械強度。 。首先，在 樹脂製容器 左右，然後 容器，在其 6〇°C的烤爐 冷卻。接著 品測磁儀： 磁化曲線（ 磁化曲線的 I磁化率；t： g 用振實體積 -14- 201238715 所塗層的磁性體的厚度，在作成切割刃部時所作的間 隙的大小也會有影響，所以特別需要適當的範圍。最小厚 度，在以電鍍方式塗層的情況也能幾乎無間隙地將磨粒全 體塗層的厚度也就是2.5 // m以上較佳。例如，上述磨粒 的較佳平均粒徑範圍的最大値3 00 y m的情況，只要0.5% 以上，尤其爲0.8%以上即可。藉由將塗層的厚度作成該 方式，則當作爲外周切斷刃切斷加工時，也能獲得保持力 能減少磨粒的脫落，而藉由適當選擇所塗層的磁性體的種 類，則在電鏟步驟中不會脫落，藉由磁場將磨粒吸引到台 板外周緣部上或附近。 最大厚度，例如在上述磨粒的較佳平均粒徑範圍的最 小値1 0 V m的情況，在切斷加工沒有有效功能的部分、或 妨礙磨粒的自生作用的部分增加，加工能力會降低，所以 相對於磨粒的平均粒徑作至1 〇〇%較佳。 將磨粒結合的金屬結合材，是後述的電鍍金屬（合金 )。在切割刃部的形成，需要將永久磁鐵配設成接近台板 的外周緣部，例如可採用，在較台板的外周端更內側的台 板面上，或在較外周端更內側而從台板側面起算的距離在 2 0mm以內的空間內，藉由配置殘留磁通密度爲0.3T以上 的兩個以上的永久磁鐵，在從台板的至少外周端起算 10 mm以內的空間形成8k A/m以上的磁場，並且在預先塗 層磁性體而成的鑽石磨粒及/或cBN磨粒，使該磁場作用 而產生磁性吸引力，藉由其吸引力將該磨粒磁性吸引固定 於台板外周緣部上或附近，保持該狀態在台板外周緣部上 -15- 201238715 實施電鍍或無電解電鍍，而將其固定於台板外周緣部上的 方法。 作爲此時所用的夾具，可以使用一對夾具主體，該夾 具主體具有：由具有較台板的外徑更大的外徑的絕綠體所 構成的外殻、以及在該外殼配置固定成較台板的外周端更 內側的永久磁鐵。電鍍能將台板保持於該夾具主體之間來 進行。 第2圖、第3圖，是顯示當該電鍍時所用的夾具的一 個例子，50、50是一對夾具主體，該夾具主體50、50, 分別具有：爲絕緣體製的外殼52、52、以及安裝於該外殼 52、52的永久磁鐵54、54;在夾具主體50、50之間保持 著台板1。將永久磁鐵54、54埋設於外殼52、52內的方 式較佳，而也可將其設置成與台板1抵接。 在內建於夾具的永久磁鐵，在以電鍍法析出金屬結合 材固定磨粒期間，需要持續將磨粒吸引於台板的磁力。所 需要的磁力，雖然根據台板外周緣部與磁鐵的距離、或預 先將磨粒塗層的磁性體的磁化量或磁化率，而是藉由使用 永久磁鐵所得到，該永久磁鐵其殘留磁通密度爲0.3T以 上，保磁力爲〇.2MA/m以上，較佳爲殘留磁通密度爲 0.6T以上，保磁力爲0.8MA/m以上，更好爲殘留磁通密 度爲1.0T以上，保磁力爲Ι.ΟΜΑ/m以上。 永久磁鐵的殘留磁通密度，其値越大，則所形成的磁 場的梯度會越大，所以在想要局部吸引磨粒的情況很適合 。因此，爲了防止：在電鍍中所產生的電鍍液的攪拌或台 -16- 201238715 板與夾具的擺動導致的振動，讓磨粒從台板脫離的情形， 使用0.3T以上的殘留磁通密度的永久磁鐵較佳。 保磁力其値越大，則則即使暴露於高溫的電鍍液也能 長時間將磨粒強力磁性吸引於台板，針對所用的磁鐵的位 置、形狀、大小的自由度變大，而夾具製作變得容易，所 以從符合所需要的殘留磁通密度中選擇即可。 永久磁鐵的塗層，也考慮在磁鐵接觸電鍍液的情況， 以儘可能減少塗層材對電鍍液的溶出或與電鍍液中的金屬 種置換的條件來選擇，來提高永久磁鐵的耐蝕性》例如， 使用Ni電鍍液析出金屬結合材的話，Cu、Sn ' Ni的金屬 、.或環氧樹脂或丙烯酸樹脂的塗層較適合。 內建於夾具之永久磁鐵的形狀與尺寸及數量，是根據 台板的超硬合金的大小、所需要的磁場的位置與方向與強 度。例如，想均勻地將磨粒固定於台板外周緣部的情況， 則將配合台板的外徑的環狀或圓弧狀的磁鐵、或其中一邊 的長度爲數mm左右的長方體狀磁鐵，沿著台板外周無間 隙地連續配置。而也能以減少磁鐵花費的成本的目的，在 該磁鐵之間設置均等的空間而減少其數量來配置。 雖然也根據所用的磁鐵的殘留磁通密度，而藉由將磁 鐵間隔加大，設置：將預先藉由磁性體塗層的磨粒予以吸 引的部分以及不吸引的部分，作出有固定磨粒的部分以及 沒有磨粒的部分，而作成矩形的切割刃部也可以。 使台板外周緣部產生的磁場，能藉由在夾著台板的兩 個夾具主體處固定的永久磁鐵的位置與磁化方向的組合， -17- 201238715 而能作出各方式，反覆磁場解析與實証來決定成在從台板 的至少外周端起算1 〇mm以內的空間形成8kA/m以上，較 佳爲40 kA/m以上的磁場。磁場的強度小於8kA/m的話， 預先藉由磁性體塗層的磨粒的吸引力不夠’在該狀態電鍍 的話，在電鍍中磨粒會移動，而可能形成間隙較多的切割 刃部、或將磨粒固定成樹枝狀而切刃部的尺寸大於所需要 的尺寸。結果，在整形加工中切刃部會脫落、或讓整形加 工花費的時間變長，往往會讓製造成本增加。 永久磁鐵的位置，雖然儘可能接近想吸引磨粒的部分 越好，大致來說，在較台板的外周端更內側的台板面上、 或較外周端更內側且從台板面起算的距離爲20mm以內的 空間內，在距離1 Omm以內的空間內更好。在該範圍的特 定位置將具有0.3T以上的殘留磁通密度的永久磁鐵，以 包含其全部或局部的方式配置兩個以上（每一個夾具主體 —個以上），則能在台板的至少外周端起算10mm以內的 空間內形成8 kA/m以上的磁場，所以像合金工具鋼或高 速度鋼的飽和磁化量較大容易感應磁力的材質當然較理想 ，而即使像超硬合金的飽和磁化量較低而磁力的感應較小 的材質，也能在台板外周緣部讓磁力形成適當的磁場。藉 由將預先以磁性體塗層的磨粒進入該磁場內，則將塗層皮 膜磁化，所以結果可將磨粒吸引保持於所需要的台板外周 緣部上或附近。 從台板外周端起算的磁鐵的位置，例如，從外周端起 算0.5 mm外側（作爲外周切斷刃時的與旋轉軸分離側）的 -18- 201238715 情況’即使是在非常接近台板外周端的位置，在不包含上 述範圍的情況，台板外周端附近的磁場強度雖然變強，可 是容易產生磁場梯度反轉的區域，所以表示磨粒從台板浮 起這樣的動作，磨粒容易脫落。即使在較台板外周端更內 側’從外周端起算的距離超過20mm的情況，在從台板的 外周端起算l〇mm以內的空間形成的磁場的強度容易小於 8 kA/m，所以磁性吸引磨粒的力量可能會不夠。在該情況 ’將磁場的強度上升，雖然也有將磁鐵加大的方法，而在 該方法會將想吸引磨粒的部位附近的磁場強度全體提升， 而容易讓磨粒附著在不想吸引磨粒的位置而較不適當。而 且將該.磁鐵加大的方法，用來保持磁鐵的夾具也會變大， 所以實際並不適當。 夾具的形狀，是配合所使用的台板的形狀。其尺寸是 用當以夾具夾住台板時對於台板能將永久磁鐵固定在所需 要的位置的尺寸。例如，台板的大小爲外徑0 1 2 5 m m、厚 度0.26mm，永久磁鐵的大小爲L2.5mmxW2mmxtl.5mm的 情況，可以使用外徑125mm以上，厚度20mm左右的圓板。 更具體來說，夾具的外徑，爲了能確保所需要的磨粒 層的高度（朝徑方向的突出量）（第1圖（C)的H2)， 爲台板的外徑+(磨粒層的高度X2)以上，其厚度，雖然 根據材質，而是要能確保在藉由出入高溫的電鑛液時的劇 烈溫度變化等而不會產生翹曲等的程度的強度的厚度。與 磨粒相接的部分的夾具厚度，也可作薄成讓磨粒層可得到 朝台板的厚度方向突出的量（第1圖（C)的T3)，使用 19- 201238715 與突出量同等的厚度的遮蔽膠帶，作成與其他部分相同厚 度也可以》 夾具的材質，由於將夾著台板的夾具全體含浸於高溫 的電鍍液使金屬結合材析出，所以用電鍍不會析出的絕緣 體較佳，其中希望能具有：耐藥性、至90 °C程度的耐熱性 、即使反覆受到出入電鍍液時所產生的急遽溫度變化也能 保有穏定尺寸的耐熱衝擊性。並且也需要尺寸穩定性，即 使當含浸於高溫的電鍍液時，不會因爲成形時或加工時所 累積的內部應力等產生翹曲而在其與台板之間產生間隙的 情形。當然也需要加工性，能在任意位置以沒有裂紋或缺 口的高精度來加工出用來內建永久磁鐵的溝部。 具體來說，可以使用 PPS、PEEK、POM、PAR、PSF ' PES等的工程塑膠或氧化鋁等的陶瓷。使用這種材質， 也考慮機械強度決定厚度等的尺寸，設置：用來保持永久 磁鐵的溝部、或當使用電鍍法的情況收容所需要的供電電 極等的溝部。將以該方式製作的一對的兩個夾具主體與一 片台板一體化。當一體化時，以能進行電鍍的方式使用用 來通電於台板之電極等來緊固的話，就能同時達到確保供 電部與緊固，也能將全體小型化。當然，作成一次能對複 數台板電鍍，例如，如第2.圖所示，作成能將夾具連結的 構造的話，可更有效率的生產。 也就是說在第2圖，56、56是分別在外殼52、52的 中央部安裝的兼作台板緊壓件的電鍍用陰極體，該陰極體 56、56’接觸於：用來將一對夾具主體50、50支承、固 -20- 201238715 定的導電性的支承棒58，可從該支承棒58通電。第2圖 的夾具，是將兩組的一對夾具主體50、50分離預定間隔 而安裝於支承棒58。在第2圖中，60是接頭，62是端蓋 。該第2圖的夾具爲電鍍用，在無電解電鍍用的情況，則 不需要陰極棒，取而代之設置非導電性的緊壓件也可以， 支承棒也不一定需要導電性。 在使用這種夾具進行電鍍的情況，將塗層有磁性體的 磨粒根據需要用天秤等量取任意的質量，當以保持著永久 磁鐵的一對夾具主體夾住台板時，被吸引保持於藉由台板 外周部與夾具所形成的間隙。第3圖說明該間隙，在從一 對夾具主體.50、50 (外殼52、52 )的台板1朝前側突出 的突出部52a、52a與台板1的前端部之間形成間隙64， 將磨粒磁性吸引於該間隙64。 所保持的磨粒的量，取決於：所使用的台板的外徑與 厚度、磨粒的大小及所需要的切割刃部的高度或寬度。將 用來保持磨粒的電鑛反覆進行數次，讓在台板外周的全部 位置每單位體積的磨粒的量成爲均等，且以電鍍法堅固地 固定磨粒。 以該方式形成切割刃部，而切割刃部的磨粒的體積率 ，爲10〜80體積％，尤其爲30〜75體積％的範圍較佳。 小於1 〇體積°/〇，有助於切斷的磨粒的比率較少，切斷時的 阻力增加。超過80體積°/。的話’切斷中的刀鋒變形量較少 ，所以在切斷面會殘留切割痕跡而被加工物的尺寸精度或 外觀較差。根據這些理由，所以不得不降低切斷速度，所 -21 - 201238715 以因應目的藉由將塗層於磨粒的磁性體的厚度改變，來改 變粒徑調整體積率較佳。 如第1圖（C )所示，切割刃部20是以夾持部22a、 22b與主體（20)所構成，以夾持部22a、22b夾持台板的 外周緣部，主體（20)較台板10的外周部更朝前方突出 形成》這裡主體與夾持部的說明是爲了方便，這些構造是 —體地形成切割刃部。該切割刃部20的厚度形成爲較台 板10的厚度更厚的方式很有效，以該方式形成第3圖所 示的間隙64較佳。 在該情況，在第1圖（C)，將切割刃部的台板外周 部夾持的一對夾持部22a.、22b的長度H1，分別爲0.1〜 10 mm，尤其爲 0.5〜5mm較佳。該一對的夾持部22a、 22b的厚度T3，分別爲5#m (0.005mm)以上，較佳爲5 〜2000/zm，更好爲1〇〜1000/zm，於是，該一對夾持部 22a、22b的合計厚度（也就是切割刃部較台板更厚的部分 的厚度）爲0.01mm以上較佳，更好爲〇.〇1〜4mm，最好 爲0.02〜2mm。夾持部22a、22b的長度H1小於0.1mm的 話，雖然有防止台板外周緣部的缺口或裂紋的效果，可是 會有台板的補強效果較少，無法防止因爲切斷時的阻力導 致台板變形的情況。Η 1超過1 0mm的情況，可能會讓相對 於補強台板的成本績效（cost performance )降低。另一方 面’ T3小於5//m的話，無法提高台板的機械強度，而無 法將切割漿液有效地排出。 如第4圖（A)〜（D)所示，夾持部22a'22b，也 -22- 201238715 可由金屬結合材24與磨粒26所形成（第4圖（A))， 也可僅藉由金屬結合材形成（第4圖（B))，僅藉由金 屬結合材將台板10覆蓋’也可再將其覆蓋形成金屬結合 材與磨粒的層（第4圖（C))。在第4圖（C)的外側以 覆蓋全體的方式使金屬結合材析出成爲（第4圖（D)) 的話，可以更提升切割刃部的強度。 並且如第4圖（B)〜（D)，作爲僅藉由金屬結合材 24來形成與夾持部的台板10相接的部分的方法，例如採 用：僅使要形成台板的夾持部的部分露出，將其他部分遮 蔽，在該狀態進行電鑛之後，安裝上述夾具，將磨粒26 充塡於間隙64來進行電鍍的方法，在將磨粒26電沉積之 後，例如’在電沉積部分露出的外徑的第2圖的外殼52、 52，將台板10遮蔽’進一步進行電鍍，藉此如第4圖（D )’則能形成：作爲切割刃部最外層的僅由金屬結合材24 構成的層部。 切割刃部20的較台板10更朝前側突出的突出部的突 出長度（第1圖（C)的H2)，雖然是根據所固定的磨粒 的大小’而0.1〜10mm，尤其爲0.3〜8mm較佳。突出長 度小於0.1mm的話，藉由切斷時的衝擊或磨耗讓切割刃部 消失爲止的時間較短，結果會讓刃部的使用壽命變短，超 過10mm的話’雖然也根據刃厚（第1圖的τ2)，而可能 會讓切割刃部容易變形，切斷面彎曲而切斷的磁鐵的尺寸 精度變差。切割刃部，是由：金屬結合材24及磨粒26與 後述的含浸樹脂所形成。 η •23- 201238715 金屬結合材，是藉由電鍍所形成的金屬或合金，從Ni 、Fe、Co、Cu及Sn所選出的一種金屬、由從這些金屬所 選出的兩種以上所構成的合金、或這些金屬或合金的一種 與由P及Μη所選出的一種或兩種的合金較佳，將其藉由 電鍍析出成將磨粒間以及磨粒與台板之間予以連結。 在以電鍍形成金屬結合材的方法，雖然大致分爲電沉 積法（電鍍法）與無電解電鍍法兩種，而在本發明，是將 容易控制在結合材殘留的內部應力且生產成本較便宜的電 沉積法、與只要電鍍液進入的話就能較均勻地析出金屬結 合材的無電解電鍍法，以讓在切割刃部所包含的間隙成爲 後述適當的範圍的方式，分別單獨或組合來使用。 鍍Ni或鍍Cu等的單一金屬，例如在使用電鍍法是用 磺胺酸Ni電鍍液的情況，主成分的磺胺酸鎳的濃度，電 鍍時的電流密度，電鍍液的溫度爲適當的範圍，且也可實 施鄰苯磺醯亞胺或對甲基苯磺醯胺等的有機添加物的添加 、或加上Zn、S、Μη等的元素，調整皮膜的應力等。其 他在Ni-Fe合金、Ni-Mn合金、Ni-P合金、Ni-Co合金、 Ni-Sn合金等的電鍍合金的情況，將合金中的Fe、Μη、P 、（:ο、Sn的含有量、電鍍液的溫度等調整成適當的範圍 等，來調整皮膜的應力。當然在這些合金電鍍的情況，能 調整應力的有機添加物的併用也很有效。 電鍍能使用使單一金屬或合金析出的以往習知的電鍍 液，採用該電鍍液的平常的電鍍條件，用習知的方法來進 行。 -24- 201238715 作爲適當的電鍍液，例如磺胺酸鎳爲2 5 0〜600 g/L、硫 酸鎳爲50〜200g/L、氯化鎳爲5〜70g/L、硼酸爲20〜 4 0g/L、鄰苯磺醯亞胺爲適量的磺胺酸瓦特鎳電鍍液、焦 磷酸銅爲30〜150 g/L、焦磷酸鉀爲100〜450 g/L、25 %氨 水爲1〜20m.L/L、硝酸鉀爲5〜20g/L的焦磷酸銅電鍍液 等。而作爲無電解電鍍液，例如硫酸鎳爲10〜50g/L、次 亞磷酸鈉爲10〜50g/L、醋酸鈉爲10〜30g/L、檸檬酸鈉 爲5〜30 g/L、硫尿爲適量的無電解鎳磷合金電鍍液等》 藉由這種方法，在台板的外周部以接近最終形狀的尺 寸，高精度地形成：鑽石磨粒、cBN磨粒或鑽石磨粒與 cBN磨粒的混合磨粒。. 在本發明，在以上述方法所得到的，切割刃部的磨粒 間以及磨粒與台板之間存在的空隙，含浸熔點3 50°C以下 的熱可塑性樹脂、或含浸硬化溫度爲3 50°C以下的液體狀 的熱硬化性樹脂組成物，將其硬化成爲熱硬化,性樹脂。藉 此，在本發明的超硬合金台板外周切斷刃，在切割刃部的 內部及表面的磨粒間及磨粒與台板之間，包含有：熔點 3 50°C以下的熱可塑性樹脂、或硬化溫度爲3 50°C以下的液體 狀的熱硬化性樹脂組成物的硬化物也就是熱硬化性樹脂。 作爲所含浸的熱可塑性樹脂及熱硬化性樹脂，例如環 氧樹脂、丙烯酸樹脂、苯酚樹脂、聚醯胺樹脂、聚醯亞胺 樹脂、及這些樹脂的變性樹脂；可使用從這些之中選出的 一種以上。 作爲將熱可塑性樹脂及熱硬化性樹脂含浸於切割刃部 -25- 201238715 的方法，·具體來說，在熱可塑性樹脂的情況，例如將加工 成〜2.0mm、較佳爲0 0.8〜1.5mm的線狀、粉狀、 或與切割刃部的形狀尺寸相同且厚度爲〇.〇5〜1.5 mm的環 狀的薄膜狀的熱可塑性樹脂，放置於切割刃部，在加熱板 這樣的加熱器上、烤爐中等，將升溫到熔點以上且熔融的 樹脂，含浸於切割刃部，然後漸漸冷卻回到室溫的方法》 在熱硬化性樹脂的情況，例如，將包含有機溶劑、硬化劑 等的液狀的熱硬化性樹脂組成物，放置於切割刃部浸透， 升溫到硬化溫度以上，使其硬化，漸漸冷卻回到室溫的方 法。其他，在於切割刃部的附近有些許餘隙的下模具，在 將含浸前的外周切斷刃放入之後，將預先量取的樹脂或樹 脂組成物充塡，嵌合上模具，將上下適度加壓同時加熱， 將樹脂或樹脂組成物含浸於切割刃部，冷卻然後解除壓力 ，將其從模具取出。加熱之後，爲了不殘留應變，將其漸 漸冷卻。 在將濕潤性較高的樹脂進行含浸的情況，將台板以不 鏽鋼、鐵、銅等的金屬夾住然後通電，藉由使該金屬發熱 ’來將台板及切割刃部加熱，使發熱的切割刃部接觸到樹 脂熔化的熔液或液狀的樹脂組成物，而進行含浸。 以該方式所得到的切割刃部，讓磨粒、將塗層於磨粒 的磁性體、金屬結合材、含浸於間隙的樹脂成爲適度分散 的狀態。 含浸於該切割刃部的樹脂的物性，適合爲以下所示。 熔點爲350 °C以下的範圍較佳》熱可塑性樹脂的情況，爲 -26- 201238715 了防止：在超硬合金台板產生應變而尺寸精度惡化、機械 強度變化、超硬合金台板與切割刃部的熱膨脹差明顯而讓 切割刃部變形、或殘留有應變；而針對熔點的上限溫度， 爲3 5 0 °C以下，較佳爲3 0 0 °C以下。另一方面，熱硬化樹 脂的情況，爲了在室溫附近含浸組成物，只要有足夠的流 動性即可，熔點爲1 〇°C以上較佳。 樹脂的彈性，帕松比（Poisson ratio)爲〇.3〜0.48, 較佳爲0.33〜0.44者較適合。帕松比（P〇isson ratio)低 於〇·3的情況，缺乏柔軟性，很難讓切斷面滑順地連接。 帕松比（Poisson ratio)高於0.48的情況，硬度等其他物 性不夠，刀鋒的變形會過大。帕松比（Poisson ratio)， 是使用供含浸的樹脂的15x1 5x 15mm的試料，藉由脈衝超 音波法所測定。 樹脂的硬度，只要其程度爲不會妨礙：即使在切斷中 磨粒磨掉、破壞、脫落等，下個磨粒也會露出而有助於切 斷的作用（磨粒的自生作用）即可，其硬度低於：覆蓋磨 粒的磁性體或固定磨粒的金屬結合材較佳。而且必須即使 暴露於在切削加工時所用的加工油或冷卻液，也不會產生 強度變化或腐蝕。 用來含浸樹脂的切割刃部，因應需要，可使用利用氧 化鋁、碳化矽、鑽石等的磨石所進行的硏磨加工、或放電 加工等調整成所需要的尺寸。此時，雖然根據刃厚，而在 刀鋒實施C0.1以上或R0.1以上的倒角的方式，除了能減 少切斷面的切割痕跡，且能有效減低磁鐵端面的缺口。 -27- 201238715 適用本發明的外周切斷刃的切斷，作爲其被加工物（ 被切斷物），對於R-Co類稀土類燒結磁鐵，R-Fe-B類稀 土類燒結磁鐵（R是包含Y的稀土類元素的至少一種）的 切斷很有效。這些磁鐵，例如以下述方式所製造。 R-C〇類稀土類燒結磁鐵，具有：RC〇5類、R2Co17類 等。其中，例如，在r2C〇|7類，是由：質量百分率20〜 28%的 R、5 〜30%的 Fe、3 〜1 0%的 Cu、1 〜5%的 Zr、及 剩餘部Co所構成。以該成分比秤量原料來進行溶解、鑄 造，將所得到的合金微粉碎至平均粒徑1〜20μιη，而得到 R2C〇17類磁鐵石粉末。然後在磁場中成形，並且以1100 〜1 25 0°C燒結0.5〜5小時，接著以較燒結溫度更低〇〜 5 0 °C的温度，進行溶體化〇 . 5〜5小時，最後以7 0 0〜9 5 0 °C 保持一定時間後，實施冷卻的時效處理。 R-Fe-B類稀土類燒結磁鐵，是由：質量百分率5〜 40°/〇的R、50〜90%的Fe、0.2〜8%的B所構成；爲了改善 磁性特性或耐蝕性，添加：C、Al、Si、Ti、V、Cr、Μη 、（:ο、Ni、Cu、Ζη、Ga、Zr、Nb、Mo、Ag、Sn、Hf、Ta 、W等的添加元素。這些添加元素的添加量，在c〇的情 況’質量百分率爲3 0%以下，其他元素的情況則質量百分 率爲8%以下。以該成分比秤量原料來進行溶解、鑄造， 將所得到的合金微粉碎至平均粒径1〜20μπι，而得到R-Fe-B類磁鐵粉末。然後在磁場中成形，並且以1〇〇〇〜 1200 °C燒結〇.5〜5小時，在400〜1000艺保持一定時間後 ’實施冷卻的時效處理❶ -28- 201238715 本發明的外周切斷刃，尤其讓刀鋒的壓縮剪斷應力在 預定的範圍的話，則能有效讓在切斷面不會殘留切割痕跡 ，能以高尺寸精度切出稀土類磁鐵。例如，在外周切斷刃 ，調整爲：切割刃部的厚度爲0.1〜1 .0mm，外徑爲80〜 2 0 0mm，刀鋒的倒角以R或C爲0.1以上之後，讓外周切 斷刃成爲水平，使用·‘以只有切割刃部露出的厚度5mm 的圓形鐵板上下夾住外周切斷刃之支承夾具，按壓時保持 成讓台板部分不會翹曲，在從超硬合金台板的外周朝外側 離開0.3mm的位置，將切割刃部，以接觸部的長度（切割 刃部的突出量一 〇.3mm)、寬度爲10mm的壓頭，在外周 切斷刀的旋轉軸方向（切割刃部的厚度方向）以線速 lmm/min按壓，將該動作持續至切割刃部斷裂，來測定相 對於壓頭的移動量之應力。在該情況壓頭的移動量變大的 話，確認爲曲線圖顯示直線性的區域，也就是壓頭的移動 量與應力成比例的區域。計算出該變形量與應力的比例區 域的傾斜度的話，在1〇〇〜1〇〇 ΟΟΝ/mm的範圍，能有效於在 切斷面不會殘留切割痕跡，且能切出高尺寸精度的磁鐵。 〔實施例〕 以下顯示實施例及比較例，具體說明本發明，而本發 明並不限於下述實施例。 〔實施例1〕 將質量百分率WC爲90%，Co爲10%的超硬合金，加 -29- 201238715 工成外徑0 125mmx內徑0 40mmx厚度〇_3mm的環狀具有 孔的圓板，成爲台板。該台板的楊氏模量爲600 GPa，飽 和磁化量爲127kA/m(0.16T)。 將該台板以黏貼帶遮蔽成僅讓從外周端起朝內側 1.0mm的部分露出，在市面販賣的脫脂鹼水溶液以40 °C含 浸10分鐘後，進行水洗，在50°C的焦磷酸鈉30〜80g/L 的水溶液以2〜8A/dm2通電同時進行電解》接著，將超硬 合金台板在純水中進行超音波洗淨之後，將其含浸於50 °C 的磺胺酸瓦特鎳電鍍液，以5〜20 A/dm2通電進行基體電 鍍之後，將遮蔽帶剝落進行水洗。 接著在外徑</> 130mm，厚度10mm的PPS樹脂製圓盤 的一側面，形成外徑0 123mm，內徑</» 119mm，深度 1.5mm的溝部，於該溝部，將長度2.5mmx寬度2mmx厚度 1.5mm 的永久磁鐵（shinetsu-rare-earth-magnet 製的 N39UH . Br = 1.25T )，將厚度方向作爲圓盤的深度方向 ’以均等間隔每一個圓盤排列7 5個之後，製作以環氧樹 脂埋住溝部將磁鐵固定的外殼，以由該兩片外殻所構成的 夾具主體’將磁鐵側作爲內側來夾持台板。此時，磁鐵是 與台板外周端朝台板側面內側方向相距lmm»針對從台板 外周端到1 0mm爲止的空間內所形成的磁場進行磁場解析 ，磁場強度爲8kA/m ( 0.0 1 T )以上。 將預先以NiP電鍍而質量磁化率；tg爲〇.588，平均 粒徑爲1 3 5 μ m的鑽石磨粒〇 · 4 g，全周均等地磁性吸引到 以夾具與台板作出的凹部。接著在磁性吸引著磨粒的狀態 -30- 201238715 ，將每個夾具含浸於50 °C的磺胺酸瓦特鎳電鍍液，在5〜 20A/dm2的範圍通電進行電鍍，然後進行水洗。然後磁性 吸引〇.4g的鑽石磨粒，再次反覆與上述同樣的電鍍而進 行水洗的操作。 爲了讓所得到的磨粒層兩側面露出，將夾具主體交換 成外徑0 123 mm，厚度10mm的PPS樹脂製圓盤，含浸在 5〇°C的磺胺酸瓦特鎳電鍍液，在5〜20A/dm2的範圍通電 ，電鍍析出成覆蓋切割刃部全體，進行水洗，從夾具卸下 而進行乾燥。 接著，將丙二酚A二環氧甘油醚與雙氰胺作爲樹脂主 成分而溶解於有機溶媒的液狀環氧樹脂組成物，塗佈於外 周切斷刃的切割刃部側面，保持3分鐘，保持其狀態放入 1 80 °C的烤爐保持約120分鐘之後，切斷加熱而在烤爐內 自然冷卻。該硬化的環氧樹脂的帕松比（Poisson ratio ) 爲0.34。在第5圖顯示切割刃部的刀鋒側面的顯微鏡照片。 然後使用工具硏磨盤，以讓磨粒層從超硬合金台板的 突出爲朝單側爲50ym的方式，以磨石硏磨來調整磨粒層 的突出與厚度及外徑之後，進行修整，而得到形成有厚度 0.4mm，外徑127mm的磨粒層（切割刃部）的超硬合金台 板外周切斷刃。 〔實施例2〕 將質量百分率WC爲90%，Co爲10%的超硬合金’加 工成外徑0 125mmx內徑0 40mmx厚度 0.3mm的環狀具有 -31 - 201238715 孔的圓板，成爲台板》 將該台板以黏貼帶遮蔽成僅讓從外周端起朝內側 1.5mm的部分露出，在市面販賣的脫脂鹼水溶液以40°C含 浸10分鐘後，進行水洗，在50 °C的焦磷酸鈉30〜80g/L 的水溶液以2〜8A/dm2通電同時進行電解。接著，將超硬 合金台板在純水中進行超音波洗淨之後，將其含浸於50 °C 的磺胺酸瓦特鎳電鍍液，以5〜20A/dm2通電進行基體電 鍍之後，將遮蔽帶剝落進行水洗。 接著在外徑0 130 mm，厚度l〇mm的PPS樹脂製圓盤 的一側面，形成外徑0 123mm，內徑0 119mm，深度 1.5mm的溝部，於該溝部，將長度i.Smmx寬度2mmx厚度 1.5mm 的永久磁鐵（shinetsu-rare-earth-magnet 製的 N32Z 'Br= 1.14T )，將厚度方向作爲圓盤的深度方向，以均 等間隔每一個圓盤排列1 05個之後，製作以環氧樹脂埋住 溝部將磁鐵固定的外殼，以由該兩片外殼所構成的夾具主 9 體，將磁鐵側作爲內側來夾持台板。此時，磁鐵是與台板 外周端朝台板側面內側方向相距1. 5 m m。針對從台板外周 端到1 0mm爲止的空間內所形成的磁場進行磁場解析，磁 場強度爲1 6kA/m ( 0.02T )以上。 將預先以NiP電鍍而質量磁化率/ g爲0.588，平均 粒徑爲1 3 5 # m的鑽石磨粒〇. 4 g，全周均等地磁性吸引到 以夾具與台板作出的凹部。接著在磁性吸引著磨粒的狀態 ’將每個夾具含浸於50°C的磺胺酸瓦特鎳電鍍液，在5〜 2 OA/dm2的範圍通電進行電鍍，然後進行水洗。然後磁性 -32- 201238715 吸引〇.4g的鑽石磨粒，再次反覆三次與上述同樣的電鍍 而進行水洗的操作。 爲了讓所得到的磨粒層兩側面露出，將夾具主體交換 成外徑0 123mm，厚度l〇mm的PPS樹脂製圓盤，含浸在 50°C的磺胺酸瓦特鎳電鍍液，在5〜20A/dm2的範圍通電 ，電鍍析出成覆蓋切割刃部全體，進行水洗，從夾具卸下 而進行乾燥。 接著，將在實施例1使用的液狀環氧樹脂組成物，塗 佈於外周切斷刃的切割刃部的側面保持5分鐘，保持其狀 態放入180°C的烤爐保持約120分鐘之後，切斷加熱而在 烤爐內自然冷卻。 然後使用工具硏磨盤，以讓磨粒層從超硬合金台板的 突出爲朝單側爲50/zm的方式，以磨石硏磨來調整磨粒層 的突出與厚度及外徑之後，進行修整，而得到形成有厚度 0.4mm，外徑129mm的磨粒層（切割刃部）的超硬合金台 板外周切斷刃。 〔實施例3〕 將質量百分率WC爲90%，Co爲10%的超硬合金，加 工成外徑0 125mmx內徑0 4Ommx厚度0.3mm的環狀具有 孔的圓板，成爲台板。[Technical Field] The present invention relates to a superhard alloy platen outer peripheral cutting blade suitable for use in cutting a rare earth sintered magnet and a method of manufacturing the same. [Prior Art] Various methods such as inner circumference cutting or chain cutting are performed on the cutting process of the rare earth permanent magnet (sintered magnet). Among them, the cutting process using the peripheral edge is the most widely used cutting method. The method is characterized in that the price of the cutting machine is cheap: if the superhard edge is used, the cutting amount is not larger than the method; the dimensional accuracy of the workpiece is good; the processing speed is also faster; etc.; and the mass production is excellent. The processing method is widely used for cutting of rare earth sintered magnets. For example, Japanese Laid-Open Patent Publication No. Hei 9-174441, Japanese Laid-Open Patent Publication No. Hei No. Hei 10-175171 In the outer peripheral portion of the cemented carbide platen, a technique of fixing diamond abrasive grains or CBN abrasive grains or the like with a phenol resin or Ni plating is used. By using a super-hard alloy on the platen, the mechanical strength of the platen is improved compared with the conventional alloy tool steel or high-speed steel, and as a result, the cutting precision is improved, and the cutting amount using the thin blade is reduced. The yield of the workpiece is improved, and high-speed machining is used to reduce the processing cost. The use of the outer peripheral edge of the super-hard alloy platen in this manner, although showing superior cutting and processing performance than the conventional peripheral blade, there is no end to the demand for cost reduction from the market, and it is hoped that development can be achieved higher. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. 5-193358 (Patent Document 5). Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Problem The present applicant has proposed a technique of fixing diamond abrasive grains with a resin such as phenol resin on the outer peripheral portion of a ring-shaped superhard alloy platen, or in a superhard alloy. The outer peripheral portion of the platen is a metal bonded material having an appropriate Young's modulus to fix a diamond abrasive grain or a cBN abrasive grain or the like (JP-A-2009-1 7275 1). The outer peripheral cutting edge for cutting the rare earth sintered magnet is composed of two portions of the cutting edge portion and the platen. By replacing the platen, which accounts for the majority of the peripheral cutting edge, with a high-rigidity superhard alloy, the mechanical strength is increased from -4,387,387, compared to the previous application of alloy tool steel or high-speed steel as the platen. Compared with the cutting edge, the cutting precision is improved. In addition to the super-hard alloy platen, by replacing the bonding material with a metal having an appropriate Young's modulus, the mechanical strength of the entire peripheral cutting blade is improved, and the phenol resin or the polyimide resin is previously used as a grinding machine. Compared with the outer peripheral cutting blade of the resin binder of the granular binder, the processing precision is improved, and the thinning of the blade leads to an increase in the material yield, and the speed of the cutting speed is reduced, so that the processing cost can be reduced, and the three types of high performance can be achieved. Further, in the production of the outer peripheral cutting blade of the super-hard alloy, a magnetic field is formed in the vicinity of the outer peripheral edge portion of the platen, and the magnetic field acts on the abrasive coating film previously coated with the magnetic material to magnetize the coating film, thereby attracting the abrasive grains. By manufacturing plating in this state on the outer peripheral portion of the platen, the method of manufacturing the outer peripheral cutting edge of the abrasive grain is fixed, whereby the manufacturing cost of the outer peripheral cutting blade of the cemented carbide can be reduced. The outer peripheral cutting blade of the super-hard alloy platen provided by the above technique exhibits a high-performance outer peripheral cutting blade, and the cutting process of the rare earth sintered magnet may cause the magnet to be obliquely cut or the magnet. The cut surface leaves a cutting mark or the like of the outer peripheral cutting edge to deteriorate the dimensional accuracy. Specifically, the use: outer diameter 80~200mm, thickness 0. 1~1. 0mm, the inner peripheral cutting edge of the superhard alloy platen with a diameter of 30 to 80 mm, and a high-speed, high-load cutting process with a cutting volume of 200 mm 3 /min or more per unit time, the dimensional tolerance is 50 μm or more. Case. In the case where the dimensional accuracy is deteriorated, it is necessary to increase the number of polishing processes such as polishing by the magnet to cut the cut surface, and it is necessary to perform the trimming treatment using the grindstone or the cutting condition on the outer peripheral cutting edge. -5- 201238715 In this case, for example, a linear motor such as a yoke or a magnet, or a magnet such as a hard disk VCM (audio coil motor) needs to be simultaneously achieved: the production cost including the flatness of the cut surface is reduced. Become an obstacle. The present invention has been made in view of the above circumstances, and an object thereof is to provide a super-circumferential cutting edge capable of processing a rare earth having high dimensional accuracy and providing a method of manufacturing a super-hard alloy platen at a low cost. [Means for Solving the Problem] When the rare earth sintered magnet is tilted and cut, it is recognized that the blade edge shape of the cutting blade is not bilaterally symmetrical, the blade portion is cut toward the cutting edge, or the peripheral cutting blade is attached to the processing machine. . On the other hand, the phenomenon that the cutting mark is left on the magnet is formed by cutting the outer peripheral cutting blade of the magnet, and the front cutting surface is joined to the newly formed cutting surface by the sharp direction during the cutting. The situation caused by the gap. In the middle of the cutting, the direction of travel of the cutting edge is sharply changed, such as the blade edge, for any reason, the deformation or the shape of the front end of the blade is sharply changed, so that the external feed speed is faster than the cutting edge. In the case where the outer peripheral deformation is caused by the deformation of the outer peripheral cutting force caused by the outer peripheral cutting force, the force (external force) received by the workpiece is larger and the deformation force is released, and the slurry generated during the cutting is required to be closely managed. In the processed high-precision and hard alloy platen-like sintered magnets, the side of the cutting edge is due to the fact that the direction of the outer peripheral free-cutting part is reversed, and the tilting is changed, and the traveling direction is not smoothly connected. In the case of a change, in the case of the case, the cutting edge of the cutting edge of the cutting edge of the cutting edge becomes larger, and the foreign matter from the blade -6-201238715 is blocked in the cutting groove, thereby obstructing The case where the outer peripheral cutting blade travels or the like occurs. Therefore, in order to eliminate the cutting marks generated in such a situation, the shape of the tip end of the cutting edge portion is not changed drastically, and even if the force for changing the traveling direction of the blade edge is applied during the cutting, the cutting blade portion is allowed to some extent. The way in which the deformed surface allows the cut surfaces to be smoothly connected is effective. In the outer peripheral cutting blade in which the abrasive grains are fixed to the platen by electroplating or electroless plating to form the cutting edge portion, particles having a certain particle diameter are used as the abrasive grains, so that the abrasive grains are fixed in the abrasive grains. Between the abrasive particles and between the abrasive particles and the platen, only a portion of the contact is made for electroplating without completely burying the gap between them. Therefore, in the cutting edge portion, even after the plating, there is a gap, that is, a gap communicating with the surface of the cutting edge portion, and the load on the outer peripheral cutting blade during cutting is small, and even if there are these gaps, The force received during the cutting does not cause a large deformation, and the cutting can be performed with high precision. However, when the high-load cutting of the super-hard alloy platen is performed, the local blade may be deformed or peeled off. In order to prevent the blade from deforming or falling off, the method of increasing the blade strength is effective. In the cutting blade, as will be described later, it is necessary to deform the elasticity of the cut surface smoothly. It is not easily deformed but only high strength cannot be used. In response. Therefore, the inventors of the present invention have carefully studied the structure of the cutting edge portion which simultaneously achieves high strength and elasticity, and the mechanical properties of the cutting edge portion, and found that it is used in the above-mentioned abrasive grains and abrasive grains. The gap between the abrasive grains and the platen is such that the thermoplastic resin is melt-impregnated and solidified in the gap, or the cutting portion having the thermosetting resin composition impregnated with the liquid is hardened, and this is formed. The super-hardened 201238715 gold platen outer peripheral cutting blade is effective for improving the dimensional accuracy of the cut magnet, and the thermoplastic resin is melted and impregnated and solidified, or liquid thermosetting resin. The method of impregnation and hardening of the composition is effective for high-precision and inexpensive production of the peripheral cutting blade, and the present invention has been achieved. According to the present invention, a first outer peripheral cutting blade of a superhard alloy platen is provided, which is formed of a superhard alloy having a Young's modulus of 450 to 700 GPa, an outer diameter of 80 to 200 mm, an inner diameter of 30 to 80 mm, and a thickness of 0. 1~1. a 0 mm round annular thin plate has a cutting edge portion on an outer peripheral edge portion of the platen, and the cutting blade portion includes diamond abrasive grains and/or cBN abrasive grains which are previously coated with a magnetic material, and the grinding machine a metal or alloy formed by plating or electroless plating between the particles and the above-mentioned abrasive grains and the platen, impregnated between the abrasive grains and a melting point between the abrasive grains and the platen is 350 ° C The following thermoplastic resin or a thermosetting resin which is cured by a liquid thermosetting resin composition which is impregnated between the abrasive grains and between the abrasive grains and the platen at a curing temperature of 350 ° C or lower. As a preferred form of the above-mentioned outer peripheral cutting blade, the impregnated resin is provided by an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, and a denatured resin of these resins. One or more selected ones, and the Poisson ratio of the above impregnated resin is 0. 3 ~ 0. 48. As a preferred form of the above-mentioned peripheral cutting blade, the saturation magnetization of the platen is 40 kA/m (0. 05T) above. As a preferred form of the above-mentioned outer peripheral cutting blade, the average particle diameter of the abrasive grains is 10 to 300 // m, and the mass magnetic susceptibility of the abrasive grains; fg 201238715 is 〇_2 or more. Secondly, a method for manufacturing a peripheral hard cutting blade of a superhard alloy platen is provided, which is similar to: forming a superhard alloy having a Young's modulus of 450 to 700 GPa, an outer diameter of 80 to 200 mm, an inner diameter of 30 to 80 mm, and a thickness of 0. . 1~1 A permanent magnet is disposed on the outer peripheral edge of the platen of the circular annular sheet of 0 mm, and the diamond abrasive grains and/or cBN abrasive grains which are previously coated with a magnetic body are formed by the magnetic field formed by the permanent magnet. The magnetic attraction is fixed to the vicinity of the outer peripheral edge portion of the platen, and the abrasive grains and the platen are connected to each other by electroplating or electroless plating while the suction and fixation are maintained, so that the abrasive grains are fixed to the abrasive grains. a cutting edge portion is formed at an outer peripheral end portion of the platen, and a thermoplastic resin having a melting point of 350 ° C or less is impregnated between the abrasive grains and a gap existing between the abrasive grains and the platen, or the impregnation hardening temperature is A liquid thermosetting resin composition of 3 to 50 ° C or less is cured. As a preferred embodiment of the above-described production method, the impregnated resin is provided by an acrylic resin, an epoxy resin, or a phenol. One or more selected from the resin, the polyamide resin, the polyimide resin, and the denatured resin of the resin, and the Poisson ratio of the above impregnated resin is 0. 3 ~ 0. 48. As a preferred form of the above manufacturing method provided, the saturation magnetization of the platen is 40 kA/m (0. 05T) above. As a preferred embodiment of the above-mentioned manufacturing method, the average particle diameter of the abrasive grains is 10 to 300 / zm, and the mass magnetic susceptibility xg of the abrasive grains is 201238715 0. 2 or more. As provided. In a preferred embodiment of the above manufacturing method, a magnetic field of 8 kA/m or more is formed by the permanent magnet 'with a space within 1 mm from the outer peripheral end of the platen. [Effect of the Invention] By using the outer peripheral cutting blade of the cemented carbide platen of the present invention, the size of the workpiece can be accurately completed only by the cutting operation, and the post-processing step after the cutting can be omitted. A rare earth magnet with high dimensional accuracy. The manufacturing method of the present invention can produce the superhard alloy platen peripheral cutting edge with excellent cost performance. [Embodiment] The outer peripheral cutting blade of the present invention has, for example, as shown in Fig. 1, a cutting edge portion 20 is formed on the outer peripheral edge portion of the platen 10 of the circular thin plate, and the cutting edge portion 20 is formed by The metal or alloy (metal bond) formed by electroplating or electroless plating incorporates diamond abrasive particles and/or cBN abrasive particles. The platen 10 is a circular thin plate (annular thin plate having an inner hole 12 formed in a central portion thereof) having a size of 0. 1~1. 0mm, preferably 0. 2~0. 8mm, outer diameter is 80~200mm, preferably 1〇〇~180mm, inner diameter (inner diameter) is 30~80mm, preferably 40~70mm » round plate of the above plate ίο, such as the first The figure has a central portion of the inner hole -10- 201238715 and the outer circumference. In the present invention, the "diameter direction" and the "axial direction" used in describing the size of the outer peripheral cutting blade are used with respect to the center of the circular thin plate. The thickness is the axial dimension and the length (height) is the diameter. Direction size. Similarly, "inside" or "inside" or "outside" or "outside" is also used with respect to the center of the circular sheet or the axis of rotation of the outer cutting edge. Made at a thickness of 0. 1~1. The range of 0 mm and the outer diameter of 200 mm or less is because a platen having a high precision can be produced, and a workpiece (workpiece) such as a rare earth sintered magnet can be cut for a long time with excellent dimensional accuracy. When the thickness is less than 0 · 1 m m, regardless of the outer diameter, large warpage is likely to occur, so that it is difficult to produce a platen with better precision, and more than one. In Ononn, the amount of cutting will increase. The outer diameter of 0 200 mm or less is the size that can be produced by the current manufacturing technology and processing technology of the super-hard alloy. The diameter of the inner hole is the thickness of the cutting shaft mounting shaft of the processing machine, which is 0 30 ～φ 80 mm. The material of the platen is a super-hard alloy. For example, carbide powders of metals belonging to Group IVB, VB, and VIB of the periodic table such as WC, TiC, MoC, NbC, TaC, and Cr3C2 are used, and Fe, Co, Ni, Mo, and Cu are used. , Pb, Sn or alloys thereof, preferably sintered alloys; particularly representative of WC-Co type 'WC-Ti type, C-Co type, WC-TiC-TaC-Co type, using Young's mode The amount is 450~700GPa. In these superhard alloys, it is preferable to have electrical conductivity capable of performing a shovel or to impart electrical conductivity by a palladium catalyst or the like. In the case of imparting electrical conductivity to a palladium catalyst or the like, a known technique such as a conductive treatment agent used for plating an ABS resin can be used, for example, from -11 to 201238715. In order to fix the abrasive grains to the platen by magnetic attraction, the magnetic properties of the platen are as large as possible, but it is assumed that even if the amount of saturation magnetization is small, it is possible to control the position of the magnet or the strength of the magnetic field as will be described later. The magnetic particles coated with magnetic particles are magnetically attracted to the platen, so as long as 40 kA/m (0. 05T) above. The saturation magnetization of the platen is a test piece of 5 mm square cut from a platen of a predetermined thickness, and a magnetization curve (4πΙ) is measured between 24 and 25 °C using a Vibrating Sample Magnetometer (VSM). — Η ), the upper limit of the magnetization 第一 of the first quadrant can be used as the saturation magnetization of the platen. In order to increase the bonding strength with the cutting edge portion formed by fixing the abrasive grains with the metal bonding material, the outer peripheral portion of the platen is also effective by performing an inverted 45 degree angle (inverted C angle) or a rounded corner (inverted R angle). By performing these chamfering treatments, even when the boundary between the platen and the abrasive grain layer is mistakenly smeared when the blade thickness is adjusted, the cutting edge portion can be prevented from falling off by leaving the metal bonding material at the boundary. The angle or amount of chamfering, the extent of processing depends on the thickness of the platen', so it is determined by the thickness of the platen used and the average grain size of the fixed abrasive particles. As the abrasive grains forming the cutting edge portion, these abrasive grains need to be coated with a magnetic material in advance, although diamond abrasive grains and/or cBN abrasive grains are used. The size or hardness of the abrasive particles coated by the magnetic body is determined in accordance with the purpose. For example, diamond (natural diamond, industrial synthetic diamond) abrasive particles, cBN (cubic boron nitride) abrasive grains can also be used separately, and mixed abrasive grains of diamond-12-201238715 stone abrasive grains and cBN abrasive grains can also be used. . Further, depending on the workpiece, each of the abrasive grains may be used alone or in combination from a single crystal or a polycrystal to adjust the cleavage tendency (Cleavage tendency). Further, on the surface of these abrasive grains, a metal such as Fe, Co, or Cr which is sprayed as a method of improving the bonding strength with a coating magnetic body to be described later is also effective in honing the particle size, although it is also based on the thickness of the platen. When the average particle diameter is 10 to 300 #m, and the average particle diameter is less than i〇ym, the gap between the abrasive grains and the abrasive grains is small, so that clogging is likely to occur during cutting, and the cutting ability is lowered, and the average particle diameter is decreased. When it exceeds 300/zm, there may be a disadvantage that the cut surface of the magnet is roughened. In this range, considering the cutting workability, the service life, etc., it is also possible to use a combination of abrasive grains of a single or several specific sizes to coat the magnetic particles of the abrasive grains, for example, in order to superhard even in a low saturation magnetization amount. The platen such as alloy can also be magnetically attracted in a short time, and will not fall off when fixed by electroplating, so that the mass magnetic susceptibility Xg of the abrasive grains is 0. 2 or more, preferably 0. 39 or more, a metal selected from Ni, Fe, and Co, an alloy composed of two or more selected from these metals, or an alloy of one or two selected from one of these metals or alloys and P and Μη By a conventional method of sputtering 'electroplating, electroless plating, etc., the thickness of the coating is such that the thickness of the coating is from 5 to 100%, preferably from 2 to 80%. The magnetic susceptibility of the abrasive grains depends on the magnetic susceptibility of the magnetized body of the coating layer and the thickness of the coating layer. Therefore, in order to obtain the desired attraction force by the size of the abrasive grains, it is necessary to consider the kind of the magnetic body. In the case of electroless nickel-13-201238715 phosphor plating, the phosphorus content is increased and the magnetic susceptibility is smaller. It is also possible to increase the magnetic susceptibility to a certain degree, so that the magnetic susceptibility is higher than that of the coating having a large magnetic susceptibility. The layering is performed with different magnetizations, so the mixing condition is adjusted within a moderate range so that the mass magnetic susceptibility of the abrasive grains; tg is 0. 2 to 0. When it is 39 or more, the abrasive grain is rapidly magnetized by approaching the outer peripheral edge field of the platen described later, so that the gap 64 of the third figure to be described later formed by the platen and the permanent magnetic jig main body is substantially uniformly ground. Magnetic attraction. If the quality of the abrasive grain: less than 0. In the case where the abrasive grains are not sucked smoothly by the gap, the abrasive grains may fall off and the like, and the abrasive grain layer may not be formed (the hole portion of the abrasive grain layer in the cutting edge portion may be formed, and as a result, the quality of the abrasive grains of the abrasive grain layer may be weakened. The rate can be measured by the following method by measuring the outer diameter of 08 mm, the twist of about 5 mm, and the inner diameter, so that the abrasive grains are as thin as possible and uniformly distributed into 1 to 2 layers, and taken out from the container, and the weight of the abrasive grains is measured. Return to the stone sarcophagus covering the melting point of about 50 °C and put the whole into the heat. Then, cover the container with the paraffin melted. The sample is at a temperature of 24~25 °C, using VSM (Vibrating Sample) Magnetometer), to determine the initial 4πΙ — Η ). The initial differential susceptibility is obtained from the inclination of the inflection point of the curve, and is divided into the mass of the abrasive grains by the weight of the sample. The magnetic field is corrected by a Ni standard sample, and the density of the abrasive particles is determined by the density. : From the implementation of the heat, the coating on the coating is on the retort, preferably: the formed magnet holder (all the part of the magnetic susceptibility; f g lead, in the plating), or in mechanical strength. . First, the resin container is left and right, and then the container is cooled in its 6 °C oven. Next, the magnetometer: magnetization curve (I susceptibility of magnetization curve; t: g thickness of the magnetic body coated with tapping volume-14-201238715, the size of the gap made when making the cutting edge Influence, so the appropriate range is required in particular. The minimum thickness, in the case of coating by electroplating, can also make the thickness of the entire coating of the abrasive particles almost 2. 5 / m or more is better. For example, the preferred average particle size range of the above abrasive particles is in the range of 値300 y m, as long as 0. More than 5%, especially 0. More than 8% can be. By setting the thickness of the coating layer in this manner, when the cutting process is performed as the outer peripheral cutting blade, the holding force can be obtained to reduce the drop of the abrasive grains, and by appropriately selecting the type of the magnetic body to be coated, It does not fall off during the shovel step, and the abrasive grains are attracted to or near the outer peripheral edge portion of the platen by the magnetic field. The maximum thickness, for example, in the case of the minimum 値10 V m of the preferred average particle diameter range of the above abrasive grains, the portion having no effective function in the cutting process, or the portion which hinders the autogenous action of the abrasive grains, the processing ability is lowered. Therefore, it is preferable to make the average particle diameter of the abrasive grains to 1% by weight. The metal bonding material in which the abrasive grains are bonded is a plating metal (alloy) to be described later. In the formation of the cutting edge portion, it is necessary to arrange the permanent magnet so as to be close to the outer peripheral edge portion of the platen, for example, on the platen surface which is more inner side than the outer peripheral end of the platen, or on the inner side of the outer peripheral end. The distance between the sides of the platen is within 20 mm, and the residual magnetic flux density is set to 0. Two or more permanent magnets of 3T or more are formed by forming a magnetic field of 8 k A/m or more in a space of 10 mm or less from at least the outer peripheral end of the platen, and pre-coating a magnetic body of diamond abrasive grains and/or cBN. The abrasive grains act to generate magnetic attraction force by the magnetic field, and magnetically attract the abrasive grains to or near the outer peripheral edge portion of the platen by the attraction force thereof, and maintain the state on the outer peripheral edge portion of the platen -15-201238715 A method of plating or electroless plating to fix it on the outer peripheral portion of the platen. As the jig used at this time, a pair of jig main bodies having an outer casing made of an evergreen having a larger outer diameter than the outer diameter of the platen, and being fixed to the outer casing may be used. A permanent magnet on the inner side of the outer peripheral end of the platen. Plating can be carried out by holding the platen between the body of the jig. 2 and 3 are views showing an example of a jig used for the plating, and 50 and 50 are a pair of jig main bodies, and the jig main bodies 50 and 50 respectively have outer casings 52 and 52 which are insulating systems, and The permanent magnets 54, 54 attached to the outer casings 52, 52; the platen 1 is held between the jig bodies 50, 50. The permanent magnets 54, 54 are preferably embedded in the outer casings 52, 52, but they may be placed in contact with the platen 1. In the permanent magnet built into the jig, during the precipitation of the abrasive particles by electroplating, it is necessary to continuously attract the magnetic force of the abrasive grains to the platen. The required magnetic force is obtained by using a permanent magnet according to the distance between the outer peripheral edge portion of the platen and the magnet, or the magnetization amount or magnetic susceptibility of the magnetic body coated with the abrasive grain in advance, and the residual magnet of the permanent magnet. The pass density is 0. Above 3T, the magnetic force is 〇. 2MA/m or more, preferably the residual magnetic flux density is 0. Above 6T, the coercive force is 0. 8MA/m or more, more preferably the residual magnetic flux density is 1. Above 0T, the magnetic force is Ι. ΟΜΑ/m or more. The residual magnetic flux density of the permanent magnet, the larger the ridge, the larger the gradient of the magnetic field formed, so it is suitable for the case where it is desired to locally attract the abrasive grains. Therefore, in order to prevent: the stirring of the plating solution generated in the plating or the vibration caused by the swing of the plate and the jig, the abrasive grains are separated from the platen, and 0. A permanent magnet having a residual magnetic flux density of 3T or more is preferred. The larger the coercive force is, the more the electroplating solution exposed to the high temperature can strongly attract the abrasive grains to the platen for a long time, and the degree of freedom of the position, shape, and size of the magnet used becomes large, and the jig is changed. It is easy to select, so it is possible to select from the required residual magnetic flux density. The coating of the permanent magnet is also considered in the case where the magnet is in contact with the plating solution, and the corrosion resistance of the permanent magnet is improved by selecting the conditions for the dissolution of the plating material to the plating solution or the replacement of the metal species in the plating solution as much as possible. For example, if a metal bonding material is deposited using a Ni plating solution, the metal of Cu, Sn 'Ni, Or epoxy or acrylic coating is suitable. The shape, size and number of permanent magnets built into the fixture are based on the size of the superhard alloy of the platen, the position and direction of the magnetic field required, and the strength. For example, when it is desired to uniformly fix the abrasive grains to the outer peripheral edge portion of the platen, an annular or arc-shaped magnet having an outer diameter of the platen or a rectangular parallelepiped magnet having a length of about several mm may be used. Continuously arranged along the periphery of the platen without gaps. Further, it is also possible to reduce the number of the magnets by arranging an equal space between the magnets for the purpose of reducing the cost of the magnets. Depending on the residual magnetic flux density of the magnet used, by increasing the spacing of the magnets, it is provided that the portions which are previously attracted by the abrasive grains of the magnetic coating and the portions which are not attracted are provided with fixed abrasive grains. The portion and the portion having no abrasive grains may be formed into a rectangular cutting edge portion. The magnetic field generated by the outer peripheral portion of the platen can be made by the combination of the position of the permanent magnet fixed at the two clamp bodies sandwiching the platen and the magnetization direction, -17-201238715, and the reverse magnetic field can be analyzed and It is empirically determined that a magnetic field of 8 kA/m or more, preferably 40 kA/m or more, is formed in a space within 1 mm from at least the outer peripheral end of the platen. When the intensity of the magnetic field is less than 8 kA/m, the attraction of the abrasive grains previously coated with the magnetic material is insufficient. In the case of electroplating, the abrasive grains may move during the plating, and a cutting edge portion having a large gap may be formed, or The abrasive particles are fixed in a dendritic shape and the size of the cutting edge portion is larger than the required size. As a result, the cutting edge portion may fall off during the shaping process, or the time taken for the shaping process becomes long, which tends to increase the manufacturing cost. The position of the permanent magnet is as close as possible to the portion of the plate that is intended to attract the abrasive grains. Generally, it is on the platen surface that is more inside than the outer peripheral end of the platen, or is more inside than the outer peripheral end and starts from the platen surface. Within a space of 20 mm or less, it is better in a space within 1 Omm. There will be 0 in a specific position of the range. A permanent magnet having a residual magnetic flux density of 3T or more may be disposed in a space within 10 mm of at least the outer peripheral end of the platen by arranging two or more of the permanent magnets including all or part of them (each of the jig bodies). A magnetic field of kA/m or more, so a material such as an alloy tool steel or a high-speed steel having a large saturation magnetization is easy to induce a magnetic force, and even a superhard alloy has a low saturation magnetization amount and a magnetic induction is small. The material can also make the magnetic field form an appropriate magnetic field at the outer peripheral edge of the platen. By introducing the magnetic particles coated with magnetic particles in advance into the magnetic field, the coating film is magnetized, so that the abrasive grains can be attracted and held on or near the outer peripheral edge portion of the platen. The position of the magnet from the outer peripheral end of the platen, for example, from the outer peripheral end. -18-201238715 in the case of the outer side of the 5 mm outer side (the side separated from the rotating shaft as the outer peripheral cutting blade) - Even in the case where it is very close to the outer peripheral end of the platen, the magnetic field near the outer peripheral end of the platen is not included in the above range. Although the strength is strong, the region where the magnetic field gradient is reversed is likely to occur, so that the movement of the abrasive grains from the platen is indicated, and the abrasive grains are likely to fall off. Even if the distance from the outer peripheral end is more than 20 mm on the inner side of the outer peripheral end of the platen, the strength of the magnetic field formed in the space within 10 mm from the outer peripheral end of the platen is easily less than 8 kA/m, so magnetic attraction The power of the abrasive particles may not be enough. In this case, 'the strength of the magnetic field is increased, and there is a method of increasing the magnet. In this method, the magnetic field strength near the portion where the abrasive grains are to be attracted is raised, and the abrasive grains are easily attached to the abrasive grains. Location is less appropriate. And that will be. The method of increasing the magnet and keeping the magnet clamp will also become larger, so it is not appropriate. The shape of the clamp is the shape of the platen used. The size is the size that can be used to fix the permanent magnet to the desired position when the platen is clamped by the clamp. For example, the size of the platen is 0 1 2 5 m m and the thickness is 0. 26mm, the size of the permanent magnet is L2. 5mmxW2mmxtl. In the case of 5 mm, a circular plate having an outer diameter of 125 mm or more and a thickness of about 20 mm can be used. More specifically, the outer diameter of the jig, in order to ensure the required height of the abrasive grain layer (the amount of protrusion in the radial direction) (H2 of Fig. 1 (C)), is the outer diameter of the platen + (abrasive grain) In addition to the material, the thickness of the layer is not less than the thickness of the layer, and the thickness of the layer is not to be warped due to a sharp temperature change or the like when the high-temperature electric ore liquid is introduced. The thickness of the jig in the portion in contact with the abrasive grains can also be made thin so that the abrasive grain layer can be obtained in the thickness direction of the platen (T3 in Fig. 1(C)), and 19-201238715 is used in the same amount as the protrusion amount. The masking tape of the thickness may be formed to have the same thickness as the other portions. The material of the jig may be such that the entire bonding material sandwiching the platen is impregnated with a high-temperature plating solution to precipitate the metal bonding material, so that the insulator which is not deposited by plating is preferably used. Among them, it is desirable to have a chemical resistance, a heat resistance to a temperature of about 90 ° C, and a thermal shock resistance of a predetermined size even if a sudden change in temperature caused by the plating solution is repeatedly received. Further, dimensional stability is required, and even when it is impregnated with a plating solution having a high temperature, a gap is not generated between the platen and the platen due to warpage caused by internal stress or the like accumulated during molding or processing. Of course, workability is also required, and the groove for the built-in permanent magnet can be machined at any position with high precision without cracks or gaps. Specifically, engineering plastics such as PPS, PEEK, POM, PAR, PSF 'PES, or ceramics such as alumina can be used. In the case of using such a material, the thickness of the permanent magnet is determined in consideration of the mechanical strength, and the groove portion for holding the permanent magnet or the groove for supplying the power supply electrode required for the plating method. The two clamp main bodies of the pair produced in this manner are integrated with one platen. When it is integrated, it is possible to ensure the power supply unit and the fastening at the same time by using an electrode or the like which is electrically connected to the platen, and the entire size can be reduced. Of course, it is possible to plate a plurality of platens at a time, for example, as in the second. As shown in the figure, a structure capable of connecting the jigs can be produced more efficiently. That is, in Figs. 2, 56 and 56, a cathode body for plating which is also used as a platen pressing member which is attached to the central portion of the outer casings 52, 52, and the cathode bodies 56, 56' are in contact with each other for: The holder main body 50, 50 supports and electrically supports the support rod 58 of the conductive rod 58 from the support rod 58. In the jig of Fig. 2, the pair of jig bodies 50, 50 of the two sets are separated from each other by a predetermined interval and attached to the support bar 58. In Fig. 2, 60 is a joint and 62 is an end cap. The jig of Fig. 2 is for electroplating. In the case of electroless plating, a cathode rod is not required, and a non-conductive pressing member may be provided instead, and the supporting rod does not necessarily need to be electrically conductive. In the case of electroplating using such a jig, the abrasive grains coated with the magnetic body are subjected to an arbitrary mass by a scale as needed, and are attracted while holding the platen with a pair of jig bodies holding the permanent magnets. The gap formed by the outer peripheral portion of the platen and the jig. Figure 3 illustrates the gap, from a pair of fixture bodies. A gap 64 is formed between the protruding portions 52a and 52a of the platen 1 of the 50, 50 (the outer casings 52, 52) protruding toward the front side and the front end portion of the platen 1, and the abrasive grains are magnetically attracted to the gap 64. The amount of abrasive particles retained depends on the outer diameter and thickness of the platen used, the size of the abrasive particles, and the desired height or width of the cutting edge. The electric ore used to hold the abrasive grains was repeatedly applied several times, so that the amount of abrasive grains per unit volume at all positions on the outer periphery of the platen was made uniform, and the abrasive grains were firmly fixed by electroplating. The cutting edge portion is formed in this manner, and the volume fraction of the abrasive grains of the cutting edge portion is preferably from 10 to 80% by volume, particularly preferably from 30 to 75% by volume. Less than 1 〇 volume ° / 〇, the ratio of the abrasive grains which contribute to cutting is small, and the resistance at the time of cutting increases. More than 80 volumes ° /. If the amount of blade deformation during the cutting is small, the cutting marks remain on the cut surface, and the dimensional accuracy or appearance of the workpiece is poor. For these reasons, it is necessary to lower the cutting speed, and it is preferable to change the particle size adjustment volume ratio by changing the thickness of the magnetic material coated on the abrasive grains in accordance with the purpose. As shown in Fig. 1(C), the cutting blade portion 20 is constituted by the sandwiching portions 22a and 22b and the main body (20), and the outer peripheral edge portion of the platen is sandwiched by the sandwiching portions 22a and 22b, and the main body (20) The outer peripheral portion of the platen 10 protrudes more forwardly. The description of the main body and the nip portion is for convenience. These structures form a cutting edge portion. The thickness of the cutting edge portion 20 is formed to be thicker than the thickness of the platen 10, and it is preferable to form the gap 64 shown in Fig. 3 in this manner. In this case, in Fig. 1(C), a pair of nip portions 22a sandwiching the outer peripheral portion of the platen of the cutting edge portion. The length H1 of 22b is 0. 1 to 10 mm, especially 0. 5 to 5 mm is preferred. The thickness T3 of the pair of clamping portions 22a, 22b is 5 #m (0. 005 mm) or more, preferably 5 to 2000/zm, more preferably 1 to 1000/zm, so that the total thickness of the pair of holding portions 22a, 22b (that is, the portion where the cutting edge portion is thicker than the platen) Thickness) is 0. 01mm or more is better, better is 〇. 〇1~4mm, preferably 0. 02~2mm. The length H1 of the clamping portions 22a, 22b is less than 0. In the case of 1 mm, the effect of preventing the chipping or cracking of the outer peripheral edge portion of the platen is small, but the reinforcing effect of the platen is small, and the deformation of the platen due to the resistance at the time of cutting cannot be prevented. Η 1 If it exceeds 10 mm, it may reduce the cost performance relative to the reinforcing platen. On the other hand, if T3 is less than 5/m, the mechanical strength of the platen cannot be increased, and the cutting slurry cannot be efficiently discharged. As shown in Fig. 4 (A) to (D), the nip portion 22a'22b and -22-201238715 may be formed of the metal bonding material 24 and the abrasive grains 26 (Fig. 4(A)), or may be borrowed only. It is formed of a metal bonding material (Fig. 4(B)), and the platen 10 is covered only by a metal bonding material. It can also be covered with a layer of a metal bonding material and abrasive grains (Fig. 4(C)). When the metal bonding material is deposited on the outer side of Fig. 4(C) so as to cover the entire surface (Fig. 4(D)), the strength of the cutting edge portion can be further enhanced. Further, as shown in Figs. 4(B) to 4(D), as a method of forming a portion that is in contact with the platen 10 of the nip portion by the metal bonding material 24, for example, only the nip which is to be formed is formed. A portion of the portion is exposed, and the other portion is shielded. After the electric ore is performed in this state, the jig is attached, and the abrasive grains 26 are filled in the gap 64 to perform electroplating. After the electrode 26 is electrodeposited, for example, The outer casings 52, 52 of the second drawing, which expose the exposed outer diameter, shield the platen 10 from further plating, whereby, as shown in Fig. 4(D)', only the metal as the outermost layer of the cutting edge portion can be formed. The layer formed by the bonding material 24. The protruding length of the protruding portion of the cutting blade portion 20 which protrudes toward the front side from the table top 10 (H2 in Fig. 1(C)) is 0 according to the size of the fixed abrasive grains. 1~10mm, especially 0. 3 to 8 mm is preferred. The protruding length is less than 0. When the distance is 1 mm, the time until the cutting edge portion disappears due to the impact or the wear at the time of the cutting is short. As a result, the service life of the blade portion is shortened. If it exceeds 10 mm, the thickness is also based on the blade thickness (τ2 in Fig. 1). However, the cutting edge portion may be easily deformed, and the dimensional accuracy of the magnet that is cut by the cut surface may be deteriorated. The cutting edge portion is formed of a metal bonding material 24 and abrasive grains 26 and an impregnating resin to be described later. η •23- 201238715 Metal bond, a metal or alloy formed by electroplating, a metal selected from Ni, Fe, Co, Cu, and Sn, and an alloy composed of two or more selected from these metals. Or one of these metals or alloys and one or two alloys selected from P and Μη are preferably deposited by electroplating to join between the abrasive grains and between the abrasive grains and the platen. In the method of forming a metal bonding material by electroplating, although it is roughly classified into two types, an electrodeposition method (electroplating method) and an electroless plating method, in the present invention, it is easy to control the internal stress remaining in the bonding material and the production cost is relatively low. The electroless deposition method and the electroless plating method in which the metal bonding material can be deposited more uniformly as long as the plating solution enters, so that the gaps included in the cutting edge portion can be used individually or in combination as described below. . a single metal such as Ni plating or Cu plating, for example, when a plating solution is used with a sulfa Ni plating solution, a concentration of a main component of nickel sulfamate, a current density during plating, and a temperature of a plating solution are in an appropriate range, and It is also possible to add an organic additive such as o-benzenesulfonimide or p-toluenesulfonamide, or to add an element such as Zn, S or Mn, to adjust the stress of the film or the like. In the case of a plating alloy such as a Ni-Fe alloy, a Ni-Mn alloy, a Ni-P alloy, a Ni-Co alloy, or a Ni-Sn alloy, the contents of Fe, Μη, P, (:ο, Sn in the alloy are contained. The amount of the plating solution, the temperature of the plating solution, and the like are adjusted to an appropriate range to adjust the stress of the film. Of course, in the case of plating these alloys, the organic additive capable of adjusting the stress is also effective. The plating can be used to precipitate a single metal or alloy. The conventional plating solution is carried out by a conventional method using the usual plating conditions of the plating solution. -24- 201238715 As a suitable plating solution, for example, nickel sulfamate is 2,500 to 600 g/L, Nickel sulfate is 50~200g/L, nickel chloride is 5~70g/L, boric acid is 20~40g/L, o-benzenesulfonimide is an appropriate amount of sulfamic acid Watt nickel plating solution, copper pyrophosphate is 30~ 150 g / L, potassium pyrophosphate is 100 ~ 450 g / L, 25% ammonia is 1 ~ 20m. L/L, potassium nitrate is a copper pyrophosphate plating solution of 5 to 20 g/L, and the like. As an electroless plating solution, for example, nickel sulfate is 10 to 50 g/L, sodium hypophosphite is 10 to 50 g/L, sodium acetate is 10 to 30 g/L, sodium citrate is 5 to 30 g/L, and thiourea is used. For an appropriate amount of electroless nickel-phosphorus alloy plating solution, etc., by this method, the outer peripheral portion of the platen is formed with high precision in a size close to the final shape: diamond abrasive grains, cBN abrasive grains or diamond abrasive grains and cBN grinding Mixed abrasive particles of the granules. . In the present invention, in the above-mentioned method, the gap between the abrasive grains of the cutting edge portion and between the abrasive grains and the platen is impregnated with a thermoplastic resin having a melting point of 3 50 ° C or less, or an impregnation hardening temperature of 3 50. A liquid thermosetting resin composition having a temperature of ° C or less is cured to be a thermosetting resin. Therefore, in the outer peripheral cutting blade of the cemented carbide platen of the present invention, the thermoplasticity at a melting point of 3 50 ° C or less is included between the abrasive grains and the abrasive grains and the platen in the inside and on the surface of the cutting edge portion. The cured product of the resin or the liquid thermosetting resin composition having a curing temperature of 550 ° C or lower is also a thermosetting resin. As the impregnated thermoplastic resin and thermosetting resin, for example, an epoxy resin, an acrylic resin, a phenol resin, a polyamide resin, a polyimide resin, and a denatured resin of these resins; those selected from these can be used. More than one. As a method of impregnating the cutting edge portion -25-201238715 with a thermoplastic resin and a thermosetting resin, specifically, in the case of a thermoplastic resin, for example, it is processed into ~2. 0mm, preferably 0 0. 8~1. 5mm linear, powdery, or the same shape and size as the cutting edge and thickness 〇. 〇5~1. A 5 mm annular film-shaped thermoplastic resin is placed on the cutting edge, and is heated on a heater such as a hot plate or an oven, and the resin heated to a melting point or higher and melted is impregnated into the cutting edge portion, and then gradually In the case of the thermosetting resin, for example, a liquid thermosetting resin composition containing an organic solvent, a curing agent, or the like is placed in the cutting edge portion to be infiltrated, and the temperature is raised to a curing temperature or higher. A method of hardening it and gradually cooling it back to room temperature. In the other case, the lower mold having a slight gap in the vicinity of the cutting edge portion is filled with the resin or the resin composition before the impregnation, and the resin or the resin composition is preliminarily filled, and the upper mold is fitted. The mixture is heated while being pressurized, and the resin or resin composition is impregnated into the cutting edge portion, cooled, and then the pressure is released, and taken out from the mold. After heating, it is gradually cooled in order not to leave strain. When the resin having high wettability is impregnated, the platen is sandwiched between metal such as stainless steel, iron, or copper, and then energized, and the metal plate is heated to heat the platen and the cutting edge portion to generate heat. The cutting blade portion is in contact with the melted molten metal or the liquid resin composition to be impregnated. In the cutting blade portion obtained in this manner, the abrasive grains, the magnetic material coated with the abrasive grains, the metal bonding material, and the resin impregnated into the gap are appropriately dispersed. The physical properties of the resin impregnated into the cutting edge portion are as follows. The melting point is preferably in the range of 350 ° C or less. In the case of thermoplastic resin, it is -26-201238715. Prevention: strain in the super-hard alloy platen, deterioration in dimensional accuracy, change in mechanical strength, super-hard alloy platen and cutting edge The difference in thermal expansion of the portion is significant, and the cutting edge portion is deformed or strain is left. The upper limit temperature of the melting point is 550 ° C or lower, preferably 300 ° C or lower. On the other hand, in the case of the thermosetting resin, in order to impregnate the composition at around room temperature, it is preferable that the melting point is 1 〇 ° C or more as long as it has sufficient fluidity. The elasticity of the resin, the Poisson ratio is 〇. 3~0. 48, preferably 0. 33~0. 44 are more suitable. When the P〇isson ratio is lower than that of the 〇·3, the softness is lacking, and it is difficult to make the cut surface smoothly connected. The Poisson ratio is higher than 0. In the case of 48, other physical properties such as hardness are insufficient, and the deformation of the blade is too large. The Poisson ratio was measured using a pulsed ultrasonic method using a 15x1 5x 15mm sample for impregnated resin. The hardness of the resin is not hindered as long as the abrasive grains are worn away, broken, peeled off, etc. during the cutting, and the next abrasive grains are exposed to contribute to the cutting action (the self-generating action of the abrasive grains). Preferably, the hardness is lower than: the magnetic material covering the abrasive grains or the metal bonding material of the fixed abrasive grains is preferred. Moreover, even if it is exposed to the processing oil or coolant used in the cutting process, there is no change in strength or corrosion. The cutting edge portion for impregnating the resin may be adjusted to a desired size by honing processing or electric discharge machining using a grindstone such as alumina, tantalum carbide or diamond. At this time, although according to the blade thickness, C0 is implemented at the blade edge. 1 or more or R0. In addition to the chamfering method of 1 or more, the cutting marks of the cut surface can be reduced, and the notch of the end face of the magnet can be effectively reduced. -27-201238715 The cutting of the outer peripheral cutting blade of the present invention is applied to the workpiece (cut object), and the R-Fe-based rare earth sintered magnet and the R-Fe-B rare earth sintered magnet (R) It is effective to cut off at least one of the rare earth elements containing Y. These magnets are manufactured, for example, in the following manner. The R-C bismuth-based rare earth sintered magnet has RC〇5 type and R2Co17 type. Among them, for example, in r2C〇|7, it is composed of: R% by mass of 20 to 28%, Fe of 5 to 30%, Cu of 3 to 10%, Zr of 1 to 5%, and Co of the remaining part. Composition. This component was dissolved and cast in comparison with the raw material, and the obtained alloy was finely pulverized to an average particle diameter of 1 to 20 μm to obtain an R2C〇17-type magnetite powder. Then formed in a magnetic field and sintered at 1100 ~ 1 25 0 ° C. 5 to 5 hours, followed by dissolution at a temperature lower than the sintering temperature of 〇 50 ° C. After 5 to 5 hours, and finally for a certain period of time at 7 0 0 to 95 ° C, the aging treatment of cooling is carried out. R-Fe-B rare earth sintered magnet is composed of: mass percentage of 5~40 ° / 〇 R, 50 ~ 90% of Fe, 0. 2 to 8% of B; in order to improve magnetic properties or corrosion resistance, add: C, Al, Si, Ti, V, Cr, Μη, (: ο, Ni, Cu, Ζη, Ga, Zr, Nb, Mo Addition elements such as Ag, Sn, Hf, Ta, W, etc. The amount of addition of these additional elements is, in the case of c〇, the mass percentage is 30% or less, and in the case of other elements, the mass percentage is 8% or less. The composition is prepared by dissolving and casting the raw material, and the obtained alloy is finely pulverized to an average particle diameter of 1 to 20 μm to obtain an R-Fe-B-based magnet powder, which is then formed in a magnetic field and is 1 to 1200. °C sintering 〇. 5 to 5 hours, after 400 to 1000 art for a certain period of time, 'the aging treatment for cooling ❶ -28-201238715 The outer peripheral cutting edge of the present invention, especially if the compression shear stress of the blade is within a predetermined range, can be effective The rare earth magnet can be cut out with high dimensional accuracy without leaving a cutting mark on the cut surface. For example, the cutting edge is cut at the outer circumference and adjusted so that the thickness of the cutting edge portion is 0. 1~1. 0mm, the outer diameter is 80~200mm, the chamfer of the blade is 0 or R or C. After 1 or more, the outer peripheral cutting blade is made horizontal, and the support jig that sandwiches the outer peripheral cutting blade with a circular iron plate having a thickness of 5 mm exposed only by the cutting blade portion is used, and the platen portion is held so that the platen portion is not pressed. Warp, leaving 0 from the outer periphery of the superhard alloy platen. At a position of 3 mm, the cutting edge will be cut to the length of the contact portion (the amount of protrusion of the cutting edge is one. 3 mm) and a head having a width of 10 mm are pressed at a linear velocity of 1 mm/min in the direction of the rotation axis of the outer peripheral cutting blade (the thickness direction of the cutting blade portion), and the operation is continued until the cutting blade portion is broken to measure the relative pressure. The amount of movement of the head. In this case, the amount of movement of the indenter becomes large, and it is confirmed that the graph shows a linear region, that is, a region in which the amount of movement of the indenter is proportional to the stress. When the inclination of the ratio of the amount of deformation to the stress is calculated, in the range of 1 〇〇 to 1 〇〇ΟΟΝ/mm, it is effective in that no cutting marks remain on the cut surface, and high dimensional accuracy can be cut out. magnet. [Examples] The present invention will be specifically described below by showing examples and comparative examples, but the present invention is not limited to the following examples. [Example 1] A superhard alloy having a mass percentage WC of 90% and a Co of 10%, plus -29-201238715, an annular plate having an outer diameter of 0 125 mm x an inner diameter of 0 40 mm x a thickness of 〇 3 mm, Become a platen. The platen has a Young's modulus of 600 GPa and a saturation magnetization of 127 kA/m (0. 16T). The platen is shielded by the adhesive tape so that it only faces from the outer peripheral end to the inner side. A portion of 0 mm was exposed, and the commercially available defatted alkali aqueous solution was immersed at 40 ° C for 10 minutes, and then washed with water, and electrolyzed at a temperature of 2 to 8 A/dm 2 in an aqueous solution of sodium pyrophosphate at 30 to 80 g/L at 50 ° C. Next, after supersonic cleaning of the superhard alloy platen in pure water, it is impregnated with a sulfamic acid Watt nickel plating solution at 50 ° C, and the substrate is electroplated at 5 to 20 A/dm 2 to form a masking tape. Peel off and wash. Then at the outer diameter </> 130 mm, one side of a PPS resin disc having a thickness of 10 mm, forming an outer diameter of 0 123 mm, an inner diameter </» 119 mm, a groove portion having a depth of 1.5 mm, and a permanent magnet having a length of 2.5 mm x a width of 2 mm x a thickness of 1.5 mm (N39UH. Br = 1.25T by Shinetsu-rare-earth-magnet) in the groove portion, and the thickness direction is After the depth direction of the disk is arranged at a uniform interval of 75 pieces per disk, an outer casing in which the magnet is buried in the groove portion by the epoxy resin is formed, and the magnet body side is used as the jig body composed of the two outer casings. The inside is used to hold the platen. At this time, the magnet is separated from the outer peripheral end of the platen by 1 mm from the inner side of the platen side. The magnetic field is analyzed for the magnetic field formed in the space from the outer peripheral end of the platen to 10 mm. The magnetic field strength is 8 kA/m (0.0 1 T). )the above. The diamond abrasive grains 〇 · 4 g which were previously electroplated with NiP and had a mass magnetic susceptibility; tg of 588.588 and an average particle diameter of 135 μm were magnetically attracted to the concave portions made by the jig and the platen. Next, in a state in which the abrasive grains are magnetically attracted -30-201238715, each jig is immersed in a sulfaic acid nickel nickel plating solution at 50 ° C, and electroplated in a range of 5 to 20 A/dm 2 , and then washed with water. Then, 4 g of the diamond abrasive grains were magnetically attracted, and the same plating as above was repeated to perform the water washing operation. In order to expose the two sides of the obtained abrasive grain layer, the clamp body is exchanged into a PPS resin disk having an outer diameter of 0 123 mm and a thickness of 10 mm, and is impregnated with a sulfamic acid Watt nickel plating solution at 5 ° C for 5 to 20 A. The range of /dm2 is energized, and plating is deposited to cover the entire cutting blade portion, washed with water, and removed from the jig to be dried. Next, a liquid epoxy resin composition in which propylene glycol A diglycidyl ether and dicyandiamide are used as a main component of the resin and dissolved in an organic solvent is applied to the side surface of the cutting edge portion of the outer peripheral cutting blade for 3 minutes. Keep the state in the oven at 180 ° C for about 120 minutes, then turn off the heat and let it cool naturally in the oven. The hardened epoxy resin had a Poisson ratio of 0.34. Fig. 5 shows a micrograph of the blade side of the cutting edge. Then use a tool to honing the disc so that the abrasive layer is protruded from the super-hard alloy platen to a single side of 50 μm, and after grinding the stone to adjust the protrusion, thickness and outer diameter of the abrasive layer, and then trimming, Further, a superhard alloy platen outer peripheral cutting edge having an abrasive grain layer (cutting edge portion) having a thickness of 0.4 mm and an outer diameter of 127 mm was obtained. [Example 2] A superhard alloy having a mass percentage WC of 90% and a Co of 10% was processed into a circular plate having an outer diameter of 0 125 mm x an inner diameter of 0 40 mm x a thickness of 0.3 mm and having a hole of -31 - 201238715, which became a table. The plate is covered with an adhesive tape so that only a portion of 1.5 mm from the outer peripheral end is exposed, and the commercially available degreasing aqueous solution is impregnated at 40 ° C for 10 minutes, and then washed with water at a temperature of 50 ° C. An aqueous solution of sodium phosphate 30 to 80 g/L was electrolyzed while being energized at 2 to 8 A/dm 2 . Next, after supersonic cleaning of the superhard alloy platen in pure water, it is impregnated with a sulfamic acid Watt nickel plating solution at 50 ° C, and the substrate is electroplated with 5 to 20 A/dm 2 , and the masking tape is peeled off. Washed with water. Then, on one side of the PPS resin disk having an outer diameter of 0 130 mm and a thickness of 10 mm, a groove portion having an outer diameter of 0 123 mm, an inner diameter of 0 119 mm, and a depth of 1.5 mm was formed, and in the groove portion, the length i.Smmx width was 2 mmx thickness. 1.5mm permanent magnet (N32Z 'Br= 1.14T made by shinetsu-rare-earth-magnet), the thickness direction is taken as the depth direction of the disc, and 105 sheets are arranged at equal intervals, and then epoxy is produced. The resin is embedded in the outer casing in which the magnet is fixed by the groove, and the main body of the jig composed of the two outer casings is sandwiched between the magnet side and the inner side. 5毫米。 The magnet is at a distance from the outer side of the platen toward the inside of the side of the platen 1. 5 m m. The magnetic field was analyzed for the magnetic field formed in the space from the outer peripheral end of the platen to 10 mm, and the magnetic field intensity was 16 kA/m (0.02 T) or more. The diamond abrasive grains 〇. 4 g which were previously electroplated with NiP and had a mass magnetic susceptibility / g of 0.588 and an average particle diameter of 1 3 5 # m were magnetically attracted to the concave portions made by the jig and the platen. Then, each of the jigs was impregnated with a sulfamate nickel electroplating solution at 50 ° C in a state where the abrasive grains were magnetically attracted, and electroplating was performed in the range of 5 to 2 OA/dm 2 , followed by water washing. Then, the magnetic -32-201238715 attracted 〇.4g of the diamond abrasive grains, and the water was washed and washed three times in the same manner as above. In order to expose both sides of the obtained abrasive grain layer, the jig body was exchanged into a PPS resin disk having an outer diameter of 0 123 mm and a thickness of 10 mm, and a sulfamic acid watt nickel plating solution impregnated at 50 ° C in 5 to 20 A. The range of /dm2 is energized, and plating is deposited to cover the entire cutting blade portion, washed with water, and removed from the jig to be dried. Next, the liquid epoxy resin composition used in Example 1 was applied to the side surface of the cutting edge portion of the outer peripheral cutting blade for 5 minutes, and held in an oven at 180 ° C for about 120 minutes. The heat is cut off and naturally cooled in the oven. Then use a tool to honing the disc so that the abrasive layer is protruded from the super-hard alloy platen to a single side of 50/zm, and after grinding the stone to adjust the protrusion, thickness and outer diameter of the abrasive layer, The outer peripheral cutting blade of the superhard alloy platen in which the abrasive grain layer (cutting edge portion) having a thickness of 0.4 mm and an outer diameter of 129 mm was formed was obtained. [Example 3] A superhard alloy having a mass percentage WC of 90% and a Co content of 10% was processed into a circular disk having an outer diameter of 0 125 mm x an inner diameter of 0 4 Omm x a thickness of 0.3 mm to form a platen.
將該台板以黏貼帶遮蔽成僅讓從外周端起朝內側 1.0mm的部分露出，在市面販賣的脫脂鹼水溶液以40°C含 浸10分鐘後，進行水洗，在50°C的焦磷酸鈉30〜80g/L 201238715 的水溶液以2〜8A/dm2通電同時進行電解。接著，將超硬 合金台板在純水中進行超音波洗淨之後，將其含浸於50 °C 的磺胺酸瓦特鎳電鍍液，以5〜20 A/dm2通電進行基體電 鍍之後，將遮蔽帶剝落進行水洗。 接著以實施例1所用的夾具主體來夾持台板，將預先 以NiP電鍍而質量磁化率；eg爲0.392，平均粒徑爲130/zm 的鑽石磨粒〇.4g，全周均等地磁性吸引到以夾具與台板作 出的凹部。接著在磁性吸引著磨粒的狀態，將每個夾具含 浸於40 °C的焦磷酸銅電鍍液，在1〜20 A/dm2的範圍通電 進行電鍍，進行水洗，從夾具卸下而進行乾燥。 接著，將在實施例1使用的液狀環氧樹脂組成物，塗. 佈於外周切斷刃的切割刃部的側面保持5分鐘，保持其狀 態放入180°C的烤爐保持約120分鐘之後，切斷加熱而在 烤爐內自然冷卻。 然後使用工具硏磨盤，以讓磨粒層從超硬合金台板的 突出爲朝單側爲50/zm的方式，以磨石硏磨來調整磨粒層 的突出與厚度及外徑之後，進行修整，而得到形成有厚度 0.4 mm，外徑126 mm的磨粒層（切割刃部）的超硬合金台 板外周切斷刃。 〔實施例4〕 將質量百分率WC爲95%，Co爲5 %的超硬合金，加 工成外徑0 125mmx內徑#40mmx厚度0.3mm的環狀具有 孔的圓板，成爲台板。該台板的楊氏模量爲5 80GPa，飽 -34- 201238715 和磁化量爲40kA/m ( 0.05T)。 將該台板以黏貼帶遮蔽成僅讓從外周端起 1.0mm的部分露出，在市面販賣的脫脂鹼水溶液以 浸10分鐘後，進行水洗，在50°C的焦磷酸鈉30 的水溶液以2〜8A/dm2通電同時進行電解。接著， 合金台板在純水中進行超音波洗淨之後，將其含浸 的磺胺酸瓦特鎳電鍍液，以5〜20A/dm2通電進行 鍍之後，將遮蔽帶剝落進行水洗。 接著以實施例1所用的夾具主體來夾持台板， 以NiP電鍍而質量磁化率；tg爲0.392，平均粒徑爲 的鑽石磨粒〇.3g，全周均等地磁性吸引到以夾具與 出的凹部。接著在磁性吸引著磨粒的狀態，將每個 浸於80°C的無電解鎳、磷合金電鍍液進行無電解電 ，進行水洗。然後，磁性吸引〇.3g鑽石磨粒，反 與上述同樣地進行電鍍而水洗的操作，從夾具卸下 乾燥。 接著，將包含：甲基丙烯酸甲酯、甲基丙烯酸 氯磺化聚乙烯以及異丙苯過氧化氫之液狀丙烯酸樹 物，塗佈於外周切斷刃的切斷刃部側面，放入80°C 緩緩地減壓至真空狀態，然後加熱60分鐘之後， 狀態的庫內冷卻。該硬化的丙烯酸樹脂的帕松比（ r a t i 〇 )爲 0.4。 然後使用工具硏磨盤，以讓磨粒層從超硬合金 突出爲朝單側爲50/zm的方式，以磨石硏磨來調整 朝內側 4 0°C 含 〜80g/L 將超硬 於 50°C 基體電 將預先 1 3 0 // m 台板作 夾具含 鍍之後 覆兩次 而進行 二酯、 脂組成 的烤爐 在減壓 Poisson 台板的 磨粒層 -35- 201238715 的突出與厚度及外徑之後’進行修整，而得到形成有厚度 0.4mm，外徑127mm的磨粒層（切割刃部）的超硬合金台 板外周切斷刃。 〔比較例1〕 將質量百分率WC爲90%，Co爲1 0%的超硬合金，加 工成外徑0 125mmx內徑0 4Ommx厚度〇.3mm的環狀具有 孔的圓板，成爲台板。 將該台板以黏貼帶遮蔽成僅讓從外周端起朝內側 1.0mm的部分露出，在市面販賣的脫脂鹼水溶液以40。(：含 浸10分鐘後，進行水洗，在50°C的焦磷酸鈉30〜80g/L 的水溶液以2〜8A/dm2通電同時進行電解。接著，將超硬 合金台板在純水中進行超音波洗淨之後，將其含浸於5 0 的磺胺酸瓦特鎳電鍍液，以5〜20A/dm2通電進行基體電 鍍之後，將遮蔽帶剝落進行水洗。 接著以實施例1所用的夾具主體來夾持台板，將預先 以NiP電鍍而質量磁化率xg爲0.392，平均粒徑爲130/zm 的鑽石磨粒〇.4g，全周均等地磁性吸引到以夾具與台板作 出的凹部。接著在磁性吸引著磨粒的狀態，將每個夾具含 浸於50°C的磺胺酸瓦特鎳電鍍液，在5〜20A/dm2的範圍 通電進行電鍍，然後進行水洗》然後磁性吸引〇.4g的鑽 石磨粒，再次反覆與上述同樣的電鍍而進行水洗的操作。 爲了讓所得到的磨粒層兩側面露出，將夾具主體交換 成外徑0 123mm，厚度10mm的PPS樹脂製圓盤，含浸在 -36- 201238715 50 °C的磺胺酸瓦特鎳電鍍液，在5〜20 A/dm2的範圍通電 ，電鍍析出成覆蓋切割刃部全體，進行水洗，從夾具卸下 而進行乾燥。 然後使用工具硏磨盤，以讓磨粒層從超硬合金台板的 突出爲朝單側爲50/im的方式，以磨石硏磨來調整磨粒層 的突出與厚度及外徑之後，進行修整，而得到形成有厚度 0.4mm，外徑127mm的磨粒層（切割刃部）的超硬合金台 板外周切斷刃。 在表1，顯示實施例1〜4以及比較例1的超硬合金台 板外周切斷刃的製造良率。這裡所謂的電鍍良率，是直到 藉由電鍍固定磨粒的步驟爲止所實施的總數（各15片.） 之中，沒有磨粒的脫落或磨粒層的欠缺爲良品，以百分率 來顯示該電鍍良品的比例，所謂加工良率，是相對於所得 到的電鍍良品，將電鍍後的步驟實施至修整爲止1沒有磨 粒層的欠缺爲良品*以百分率來顯示加工良品相對於電鍍 良品的總數的比例。所謂的綜合良率，是電鍍良率與加工 良率的累積，代表相對於供外周切斷刃的製作之台板，成 爲外周切斷刃的完成品的良品的良率。 〔表1〕 實施例1 實施例2 實施例3 實施例4 比較例1 電鍍良率（％) 100 100 100 93 100 加工良率（％) 100 100 100 100 87 ^合良率（％ ) 100 100 100 93 87 -37- 201238715 從表1可看出，相較於比較例1，實施例的良率較好 ，尤其是電鍍後的加工的良率較好，本發明的製造方法在 生產性方面也很優異》 在第6圖顯示了，使用超硬合金台板外周切斷刃，實 施將稀土類燒結磁鐵切斷的操作時，用來評估磁鐵的切斷 精度的結果。切斷精度的評估方法如以下。 首先，將實施例1〜4以及比較例1的超硬合金台板 外周切斷刃，各兩片總共10片，以間隔1.5mm，將旋轉 軸插通於台板的孔部組成爲多切斷刃。藉由該多切斷刃， 以轉數 4500rpm，進給速度 30mm/min，從寬度（W) 40mmx長度（L) 130mmx高度（H) 20mm 的 Nd-Fe-B 類稀 土類燒結磁鐵，將 W40mmxL(=厚度（t) ) 1.5mmx H2 0mm的磁鐵，切出1010次，將在實施例及比較例的各 兩片的外周切斷刃之間切斷者，作爲評估對象的切斷磁鐵 。針對切斷磁鐵，將每從切斷第一片到100片作爲尺寸測 量週期（全部10個週期），在各週期將最初的10片（也 就是最初的週期爲第1〜10片，接著爲第101〜110片， 最後爲第1001〜1010片）作爲樣本。針對各週期的10片 ，每一片以微測儀測定中央一點與角落四點的總共五點的 厚度（t )，將五點之中最大値與最小値的差當作切斷精 度（μιη)，計算出10片的切斷精度的平均値》將各尺寸 測量週期的平均値作成曲線圖爲第6圖。 比較例1的情況，尺寸測量3週期以後（切斷片數第 3〇1片以後），切斷精度變差，而實施例1〜4的情況，是 -38- 201238715 直到第10週期（切斷片數直到第1010片），切斷精度還 未降低，所以可了解本發明的超硬合金台板外周切斷刃的 使用耐久性很高。 在第7圖顯示將所得到的外周切斷刃的彈性（柔軟性 )評估的結果。這裡評估了外周切斷刃的刀鋒的壓縮剪斷 應力。在各個例子的外周切斷刃，將刀鋒的倒角調整爲R 或C的0.1以上之後，在從超硬合金台板的外周起朝外側 遠離0.3mm的位置，將切割刃部以接觸部的長度（切割刃 部的突出量一〇.3mm)、寬度爲10mm的壓頭，朝外周切 斷刃的旋轉軸方向（切割刃部的厚度方向）以線速 lmm/min按壓時之相對於壓頭的移動量之應力，使用島津 製作所強度試驗機AG-1進行測定，按壓是持續至切割 刃部斷裂爲止。在該測定，外周切斷刃成爲水平，使用： 以只有切割刃部露出的厚度5mm的圓形鐵板上下夾住外 周切斷刃之支承夾具，按壓時保持成讓台板部分不會翹曲 〇 如第7圖所示，在任何例子，壓頭的移動量變大的話 ，曲線顯示直線性的區域，也就是確認了壓頭的移動量與 應力成比例的區域。在表2顯示計算出該直線區域的傾斜 度（應力/壓頭的移動量）的結果。 〔表2〕 實施例1 實施例2 實施例3 實施例4 比較例1 傾斜度（N/mm) 800 300 400 400 18,000 -39- 201238715 當上述切斷的評估時，使用實施例的外周切斷刃切斷 所得到的磁鐵片，切斷面的外觀都很良好，而使用比較例 的外周切斷刃切斷所得到的磁鐵片，在3週期以後（切斷 片數第301片以後），產生有在切斷面有切割痕跡（落差 )的樣本。而確認了：藉由上述的外周切斷刃的彈性（柔 軟性）評估所示的壓頭的移動量與應力的傾斜度並未過大 ，具有某程度柔軟性的本發明的外周切斷刃，在切斷面不 會殘留切割痕跡，而能切出高尺寸精度的磁鐵。 根據以上結果，藉由本發明的超硬合金台板外周切斷 刃進行切斷，不用進行切斷後的加工處理，能將稀土類燒 結磁鐵等的被加工物，僅以切斷則能高精度地加工，可提 供高尺寸精度的被加工物。 【圖式簡單說明】 第1圖是本發明的外周切斷刃的顯示圖，（A)爲俯 視圖，（B)爲在（A)的線B-B的剖面圖，（C)爲（B )的C部分的放大剖面圖。 第.2圖是顯示在本發明使用的夾具的一實施例的立體 圖。 第3圖是夾持第2圖的台板的夾具主體的前端部的放 大剖面圖。 第4圖（A)〜（D)是顯示分別在台板形成的切割 刃部的狀態的局部省略剖面圖。 第5圖是實施例1的外周切斷刃的切割刃部的刀鋒側 -40- 201238715 面的顯微鏡照片。 第6圖是顯示使用在實施例1〜4及比較例1製作的 外周切斷刃來進行切斷加工的稀土類燒結磁鐵的切斷片數 與切斷精度的關係的曲線圖。 第7圖是顯示在實施例1〜4及比較例1製作的外周 切斷刃的切割刀部的變形量與應力的關係的曲線圖。 【主要元件符號說明】 1、10 :台板 1 2 :內孔 2 0 :切割刃部 2 4 :金屬結合材 2 6 :磨粒 5〇 :夾具主體 52 :外殻 54 :永久磁鐵 56 :電鍍用陰極體 5 8 :支承棒 60 :接頭 62 :端蓋 64 :間隙 -41 -The platen was shielded by an adhesive tape so that only a portion of 1.0 mm from the outer peripheral end was exposed, and the commercially available defatted alkali aqueous solution was immersed at 40 ° C for 10 minutes, and then washed with water to remove sodium pyrophosphate at 50 ° C. The aqueous solution of 30 to 80 g/L 201238715 was electrolyzed while being energized at 2 to 8 A/dm2. Next, after supersonic cleaning of the superhard alloy platen in pure water, it is impregnated with a sulfamic acid Watt nickel plating solution at 50 ° C, and the substrate is electroplated at 5 to 20 A/dm 2 to form a masking tape. Peel off and wash. Next, the platen was held by the jig main body used in Example 1, and the diamond abrasive grains of 4 g, which were previously electroplated with NiP and having a mass magnetic susceptibility; eg of 0.392 and an average particle diameter of 130/zm, were magnetically attracted uniformly throughout the week. To the recess made with the clamp and the platen. Next, in the state where the abrasive grains are magnetically attracted, each jig is immersed in a copper pyrophosphate plating solution at 40 ° C, electroplated in a range of 1 to 20 A/dm 2 , washed with water, and removed from the jig to be dried. Next, the liquid epoxy resin composition used in Example 1 was applied to the side surface of the cutting edge portion of the outer peripheral cutting blade for 5 minutes, and held in an oven at 180 ° C for about 120 minutes. Thereafter, the heating was turned off and the inside of the oven was naturally cooled. Then use a tool to honing the disc so that the abrasive layer is protruded from the super-hard alloy platen to a single side of 50/zm, and after grinding the stone to adjust the protrusion, thickness and outer diameter of the abrasive layer, The outer peripheral cutting blade of the superhard alloy platen having the abrasive grain layer (cutting edge portion) having a thickness of 0.4 mm and an outer diameter of 126 mm was obtained. [Example 4] A superhard alloy having a mass percentage WC of 95% and a Co of 5% was processed into a circular disk having an outer diameter of 0 125 mm x an inner diameter #40 mm x a thickness of 0.3 mm to form a platen. The platen has a Young's modulus of 580 GPa, a full -34-201238715 and a magnetization of 40 kA/m (0.05 T). The platen was shielded by an adhesive tape so that only a portion of 1.0 mm from the outer peripheral end was exposed, and the commercially available defatted alkali aqueous solution was immersed for 10 minutes, and then washed with water, and an aqueous solution of sodium pyrophosphate 30 at 50 ° C was used. ~8A/dm2 is energized while electrolysis is performed. Next, after the alloy platen was ultrasonically washed in pure water, the impregnated sulfamate nickel nickel plating solution was electroplated at 5 to 20 A/dm2, and then the masking tape was peeled off and washed with water. Next, the platen was clamped with the jig body used in Example 1, and the mass magnetic susceptibility was measured by NiP plating; the tg was 0.392, and the average particle diameter of the diamond abrasive grains 〇3g was magnetically attracted to the jig and the whole circumference. The recess. Next, in the state where the abrasive grains were magnetically attracted, the electroless nickel and phosphorus alloy plating solution each immersed at 80 ° C was electrolessly electrolyzed and washed with water. Then, 3 g of diamond abrasive grains were magnetically attracted, and the operation of performing electroplating and water washing in the same manner as above was carried out, and the drying was carried out from the jig. Next, a liquid acrylic tree containing methyl methacrylate, chlorosulfonated methacrylate, and cumene hydroperoxide is applied to the side surface of the cutting edge portion of the outer peripheral cutting blade, and placed in 80. °C Slowly depressurize to a vacuum, then heat for 60 minutes, then cool the state inside the chamber. The hardened acrylic resin had a Passon's ratio (r a t i 〇 ) of 0.4. Then use a tool to honing the disc so that the abrasive layer protrudes from the super-hard alloy to a single side of 50/zm, and the grindstone honing is adjusted to the inner side of 40 ° C with ~80g / L will be super hard 50 °C The base body is pre-treated with 1 3 0 // m platen as a fixture and coated twice to carry out the protrusion and thickness of the diester and grease oven in the decompressed Poisson platen -35- 201238715 After the outer diameter and the outer diameter were trimmed, a superhard alloy platen outer peripheral cutting edge having an abrasive grain layer (cutting edge portion) having a thickness of 0.4 mm and an outer diameter of 127 mm was obtained. [Comparative Example 1] A superhard alloy having a mass percentage WC of 90% and a Co of 10% was processed into a circular disk having an outer diameter of 0 125 mm x an inner diameter of 0 4 Ommx and a thickness of 33 mm to form a platen. The platen was shielded by an adhesive tape so that only a portion of 1.0 mm from the outer peripheral end was exposed, and the aqueous solution of the defatted base sold in the market was 40. (After impregnation for 10 minutes, it was washed with water, and electrolyzed at a temperature of 2 to 8 A/dm 2 in an aqueous solution of sodium pyrophosphate 30 to 80 g/L at 50 ° C. Then, the super hard alloy platen was super-extended in pure water. After the sound wave was washed, it was impregnated with a 50% sulfamic acid Watt nickel plating solution, and after the substrate was electroplated with 5 to 20 A/dm 2 , the masking tape was peeled off and washed with water. Next, the holder body used in Example 1 was clamped. The platen, which was previously electroplated with NiP and having a mass magnetic susceptibility xg of 0.392 and an average particle diameter of 130/zm, was applied to a concave portion made of a jig and a platen. At the state of attracting the abrasive grains, each jig is impregnated with a sulfaic acid nickel nickel plating solution at 50 ° C, electroplated in a range of 5 to 20 A/dm 2 , and then washed with water, and then magnetically attracted to 4 g of diamond abrasive grains. Then, the same operation as above was carried out to perform water washing. In order to expose both sides of the obtained abrasive grain layer, the jig body was exchanged into a PPS resin disk having an outer diameter of 0 123 mm and a thickness of 10 mm, impregnated with -36- 201238715 Sulfonamide at 50 °C The Watt nickel plating solution is energized in the range of 5 to 20 A/dm2, and is plated to cover the entire cutting blade portion, washed with water, and removed from the jig to be dried. Then the tool is used to honing the disk to make the abrasive layer from super hard. The alloy platen is protruded to a single side of 50/im. After the grinding stone is used to adjust the protrusion and thickness and outer diameter of the abrasive layer, the dressing is performed to obtain a thickness of 0.4 mm and an outer diameter of 127 mm. The outer peripheral cutting blade of the hard alloy platen of the abrasive grain layer (cutting blade portion). Table 1 shows the manufacturing yield of the outer peripheral cutting edge of the cemented carbide platens of Examples 1 to 4 and Comparative Example 1. The plating yield is the total number (15 sheets each) which is carried out until the step of fixing the abrasive grains by electroplating, and there is no peeling of the abrasive grains or lack of the abrasive layer, which is a good product in percentage. The ratio of the processing ratio is the ratio of the processed product to the total number of the electroplated products. . The overall yield is the accumulation of the plating yield and the processing yield, and represents the yield of the finished product of the peripheral cutting blade with respect to the platen for the peripheral cutting blade. [Table 1] Implementation Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Plating yield (%) 100 100 100 93 100 Processing yield (%) 100 100 100 100 87 ^ Combining yield (%) 100 100 100 93 87 -37 - 201238715 It can be seen from Table 1 that the yield of the examples is better than that of Comparative Example 1, especially the processing yield after plating is good, and the manufacturing method of the present invention is also excellent in productivity. Fig. 6 shows the results of evaluating the cutting accuracy of the magnet when the rare earth sintered magnet was cut using the outer peripheral cutting blade of the superhard alloy platen. The evaluation method of the cutting accuracy is as follows. First, the outer peripheral cutting blades of the superhard alloy platens of Examples 1 to 4 and Comparative Example 1 were used in a total of 10 pieces, and the holes were inserted into the hole portion of the platen at intervals of 1.5 mm. Broken edge. W40mmxL is used for the Nd-Fe-B rare earth sintered magnet with a width of (W) 40mmx length (L) 130mmx height (H) 20mm by the multi-cutting blade at a rotation speed of 4500 rpm and a feed rate of 30 mm/min. (=Thickness (t)) A magnet of 1.5 mm x H2 0 mm was cut out 1010 times, and was cut between the outer cutting blades of the two sheets of the examples and the comparative examples, and the cutting magnet was evaluated. For the cutting magnet, the first 10 pieces are cut from the first piece to the 100 pieces, and the first 10 pieces are used in each cycle (that is, the first cycle is the first to tenth sheets, followed by The first 101 to 110 pieces, and the last ones are the 1001 to 1010 pieces) as samples. For each of the 10 cycles of each cycle, each slice is measured by a micrometer to measure the thickness (t) of the total five points of the center point and the corner four points, and the difference between the maximum 値 and the minimum 五 among the five points is taken as the cutting precision (μιη). The average value of the cutting accuracy of 10 pieces is calculated. The average 値 of each size measurement cycle is plotted as a graph. In the case of Comparative Example 1, after three cycles of dimensional measurement (after the third slice of the number of cut sheets), the cutting accuracy was deteriorated, and in the cases of Examples 1 to 4, it was -38-201238715 until the tenth cycle (cut piece) Since the number of cuttings has not been lowered until the 1010th sheet, it is understood that the durability of the outer peripheral cutting blade of the superhard alloy platen of the present invention is high. Fig. 7 shows the results of evaluation of the elasticity (softness) of the obtained outer peripheral cutting blade. Here, the compression shear stress of the blade of the peripheral cutting edge is evaluated. After cutting the blade on the outer circumference of each example and adjusting the chamfer of the blade to 0.1 or more of R or C, the cutting edge portion is at a contact portion from a position away from the outer periphery of the cemented carbide platen by 0.3 mm. The length (the amount of protrusion of the cutting edge portion is 〇3 mm) and the indenter having a width of 10 mm are relative to the pressure when the direction of the rotation axis of the outer peripheral cutting blade (the thickness direction of the cutting edge portion) is pressed at a linear velocity of 1 mm/min. The stress of the movement amount of the head was measured using a Shimadzu Corporation strength tester AG-1, and the pressing was continued until the cutting blade portion was broken. In this measurement, the outer peripheral cutting blade was horizontal, and the support jig that sandwiched the outer peripheral cutting blade with a circular iron having a thickness of 5 mm exposed only by the cutting blade portion was held so that the platen portion was not warped when pressed. As shown in Fig. 7, in any case, when the amount of movement of the indenter becomes large, the curve shows a linear region, that is, a region in which the amount of movement of the indenter is proportional to the stress. Table 2 shows the results of calculating the inclination of the linear region (the amount of movement of the stress/indenter). [Table 2] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Inclination (N/mm) 800 300 400 400 18,000 -39- 201238715 When the above-mentioned cutting was evaluated, the peripheral cut of the example was used. The magnet piece obtained by the blade cutting was excellent in the appearance of the cut surface, and the magnet piece obtained by cutting the outer peripheral cutting blade of the comparative example was produced after three cycles (after the 301 pieces of the number of cut pieces). There are samples with cut marks (drops) on the cut surface. Further, it was confirmed that the amount of movement of the indenter and the inclination of the stress are not excessively large by the elasticity (flexibility) of the outer peripheral cutting blade, and the outer peripheral cutting blade of the present invention having a certain degree of flexibility is A cutting mark is not left on the cut surface, and a magnet of high dimensional accuracy can be cut out. According to the above results, the outer peripheral cutting blade of the superhard alloy platen of the present invention is cut, and the processed material such as the rare earth sintered magnet can be accurately cut only by cutting without performing the processing after the cutting. Machining provides high-precision workpieces. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the outer peripheral cutting edge of the present invention, wherein (A) is a plan view, (B) is a cross-sectional view taken on line BB of (A), and (C) is (B). An enlarged cross-sectional view of section C. Fig. 2 is a perspective view showing an embodiment of a jig used in the present invention. Fig. 3 is an enlarged cross-sectional view showing the front end portion of the jig main body of the platen of Fig. 2; 4(A) to 4(D) are partially omitted cross-sectional views showing a state in which the cutting edge portions formed on the platen are respectively formed. Fig. 5 is a photomicrograph of the blade side -40 - 201238715 of the cutting edge portion of the outer peripheral cutting blade of the first embodiment. Fig. 6 is a graph showing the relationship between the number of cut pieces of the rare earth sintered magnet and the cutting precision, which were cut by the outer peripheral cutting blades produced in Examples 1 to 4 and Comparative Example 1. Fig. 7 is a graph showing the relationship between the amount of deformation of the dicing blade portion and the stress of the outer peripheral cutting blades produced in Examples 1 to 4 and Comparative Example 1. [Description of main component symbols] 1, 10: platen 1 2 : inner hole 2 0 : cutting blade 2 4 : metal bonding material 2 6 : abrasive grain 5 〇: jig main body 52 : outer casing 54 : permanent magnet 56 : electroplating Cathode body 5 8 : support rod 60 : joint 62 : end cap 64 : gap -41 -