200936278 九、發明說明 【發明所屬之技術領域】 本發明是關於可自由拆裝地安裝在工具機的主軸，對 於被加工物進行鑽孔或鑽孔部的鑽搪等的搪孔加工，其他 機械加工所使用的切削工具。 【先前技術】 Λ 可自由拆裝地安裝在切削機等的工具機的主軸的切削。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The cutting tool used for machining. [Prior Art] 切削 Cutting of the spindle of a machine tool that can be freely attached to a cutting machine
D 工具有例如搪孔用工具爲具有設置可自由拆裝地安裝在主 軸的連結部的支架軸，該支架軸的前端設有安裝刀刃的刀 具台。在日本新型專利登錄第25 5 0328號揭示有將此刀具 台形成可自由拆裝地連結在支架軸上的構成，藉以形成可 更換刀具台。根據該習知文獻的連結構造是在支架軸的前 端部形成有前端面開口的連結用嵌入部，並在刀具台延伸 設置插入部。插入部是對於連結用嵌入部嵌合形成大致密 ρ 嵌狀態，將刀具台連結在支架軸上。另一方面，支架軸的 基端側設置對主軸的連結構件。 刀具台被相對於支架軸牢固地固定著，不僅是爲使得 從該支架軸的脫落，更必須連結使得支架軸與刀具台不相 對轉動。爲此，在刀具台的插入部與支架軸的連結用嵌入 部形成朝著軸線方向的平坦部，在兩平坦部的位置配合的 狀態下，將插入部嵌入到支架軸的連結用嵌入部。又，該 支架軸的側面形成與其軸線呈正交方向的螺孔，在該螺孔 從支架軸的外圍面栓插有鎖緊螺絲。將該鎖緊螺絲的前端 -5- 200936278 抵接在刀具台插入部的外圍面，藉以使刀具台不 軸脫離’並且固定使刀具台不致在切削加工中任 【發明內容】 〔發明所欲解決之課題〕 但是’在轉動驅動支架軸的期間，藉著設置 的刀刃進行被加工物的切削加工時，會產生起因 切削阻力的震顚振動（chatter vibration)。該震顫 產生時，形成在被加工物的孔內壁產生微小凹凸 加工精度等降低。震顫振動是由於在長尺寸支架 設置對於被加工物之作用部的刀刃所產生，支架 一旦提高時，可抑制在某一程度爲止。但是，支 狀是依存於被加工物，例如穿設於被加工物的孔 且孔深的場合，相對地形成小的支架軸的直徑， 寸。因此，該支架軸了抑制振動即不能具有足夠 使得震顫振動更爲顯著。 爲了防止乃至於降低以上的震顫振動，予以 案，並加以實用化。其代表性的有加大支架軸的 刀具台的安裝部，並藉著剛性的提高來提升其防 且在支架軸上設置消除乃至使震顫振動衰減之構 同樣爲人所熟知。另外，支架軸的整體形狀，即 前端而縮徑的斜錐形狀，也有使得其軸方向的剛 化的形狀。 致從支架 意地移動 在刀具台 於加工中 振動一旦 等，使得 軸的前端 軸的剛性 架軸的形 ，孔徑小 並且長尺 的剛性， 種種的提 頭部’即 振性，並 件的構成 隨著朝向 性程度變 -6- 200936278 在此’本案發明人等針對支架軸的震顫振動的產生原 因致力硏究的結果，不僅根據刀刃對於被加工物造成的切 削阻力’並對於支架軸之刀具台的連結方式，獲得震顫振 動的產生會有極大差的知識，以至完成本發明。 刀具台與支架軸是以單一構件形成兩構件，或者以另 外構件所構成，可將該等實質地予以一體化。形成以上構 成時，不會產生根據支架軸與刀具台間之相對移動的振動 ^ 。該點是使得刀具台與支架軸一體化，較拆裝式振動的產 生更少。 但是，利用工具的加工中對於刀具台產生過大負荷的 作用，因此會有在各部造成損壞等的可能性，因此必須卸 下刀具台進行修理•維修，或者進行更換該刀具台等維修 的必要。將刀具台與支架軸一體化時，則必須要更換含支 架軸的整體。又，刀具台形成不能從支架軸分離的場合， 由於在支架軸不能安裝其他構造的刀具台，因此支架軸不 Φ 具有泛用性。 由於上述，刀具台對於支架軸的連結方式有如上述習 知文獻的日本實用新型登錄第25 5 0328號公報所揭示，以 支架軸上連結可更換的刀具台的構成爲佳。但是，從震顫 ' 振動抑制的面而言，並不有利於支架軸與刀具台爲可更換 的構成。亦即，將刀具台的插入部嵌入到支架軸的連結用 嵌入部以鎖緊螺絲固定的場合，在該嵌合部必定會產生間 隙，導致形成震顫振動的原因。並且，持續使用工具的期 間，在拆入部與連結用嵌入部的嵌合部分會產生變形或磨 200936278 損等’導致間隙擴開的結果，並且會形成刀具台的不穩定 ，有形成更大的震顫振動的問題。 本發明有鑒於以上的點，其目的是將刀具台可拆裝地 連結在支架軸上，形成可更換該刀具台，並且可抑制動作 時的震顫振動。 〔解決課題的手段〕 爲了達成上述目的，本發明爲基端部設有可自由拆裝 連結在主軸上之主軸連結部的支架軸，及安裝刀刃的刀具 台所構成，將此刀具台可拆裝地固定在上述支架軸的前端 所構成的切削工具，其特徵爲：上述支架軸上形成有從其 前端面朝著軸線方向的凹部構成的連結用嵌入部，上述刀 具台設有嵌入上述連結用嵌入部的插入部，上述支架軸一 端在外圍面開口，另一端形成有與上述連結用嵌入部連通 的螺孔，該螺孔從上述外圍面的開口部跨上述連結用嵌入 部的連通部，相對於上述支架軸的軸線朝向基端側傾斜， 上述插入部形成有在其側面開口的卡止凹部，栓插在上述 螺孔的鎖緊螺絲形成抵接上述卡止凹部承接面的構成。 刀具台爲可自由拆裝地連結使其插入部嵌入到支架軸 的連結用嵌入部。雖然以此連結狀態固定使用鎖緊螺絲， 但是該鎖緊螺絲的栓插方向並非與支架軸的軸線正交的方 向，而是從支架軸的外圍面側在其軸線方向形成朝向基端 側傾斜下垂的方向。因此，預先將螺孔設定爲預定的傾斜 角度。藉此，在刀具台組裝於支架軸的狀態下，鎖緊螺絲 -8 - 200936278 栓插在螺孔內，將此鎖緊螺絲的前端引導至設置在刀具台 的卡止凹部內，使得該卡止凹部的底面形成承接面。其結 果’鎖緊螺絲與此承接面抵接形成2個方向的推壓力作用 。亦即’刀具台之插入部的延伸側端面被按壓在支架軸的 前端面上’並且該插入部的外圍面形成被按壓於連結部嵌 入部的內側面。因此，一旦將此鎖緊螺絲朝著該方向鎖入 時’藉著該鎖緊螺絲的推壓力，在此插入部有著朝向支架 φ 軸的連結用嵌入部方向的分力與朝著連結用嵌入部側面方 向的分力的作用，被牢固地固定。 爲了使鎖緊螺絲的推壓力可更爲確實地爲插入部的卡 止凹部的承接面所承受，增大其間的抵接面積。因此，在 鎖緊螺絲的前端設置圓錐梯形的傾斜部，可以將此傾斜部 抵接在承接面上。並且’也可以使用在鎖緊螺絲的前端部 連結可朝著任意方向滑動的鋼球體，在該鋼球體的一部份 形成抵接於承接面的平坦面部之物。 φ 如上述’將插入部引進到支架軸的連結用嵌入部，藉 以使刀具台的插入部延伸側的端面抵接在支架軸的前端面 上。因此’藉著刀具台安裝在支架軸時的該等抵接面的抵 接固定在連結狀態。並且’支架軸的嵌入部與刀具台的插 入部之間牢固的固定性是藉著插入部對於連結用嵌入部側 面按壓力的作用來達成。 以連結狀態使刀具台固定化時’增大鎖緊螺絲的鎖緊 力。並根據刀具台與支架軸抵接面的粗面化，或形成彼此 咬合的凹凸等’可以增大其間的摩擦力。其結果，可更爲 -9- 200936278 提升刀具台對於支架軸之抵接狀態的固定性。因此， 可拆裝刀具台與支架軸，在對於被加工物進行切削力口 期間，可大致完全地防止乃至於抑制刀具台相對於支 的振動，可消除震顫振動產生的一個原因。 如上述，雖然可抑制刀具台可拆裝地安裝在支架 起因的振動，但是更從抑制根據加工中刀刃的切削阻 產生震顫振動的觀點來看，將支架軸相對於主軸的連 側形成圓錐形部，以在該圓錐形部連設圓柱形部，刀 以形成連結在該圓柱形部的構成爲佳。支架軸跨其軸 向的全長形成均一的剖面形狀時，在該支架軸的固有 頻率與切削加工所產生的支架軸振動的振動頻率接近 件下’有使得特定的振動增幅的可能性。但是，設置 形部即傾斜部，使支架軸的軸線方向連續的剛性變化 可以分散振動的峰値，並可以分散後振動頻率的彼此 發揮振動衰減功能，因此可更爲抑制震顫振動。並且 前端側設置圓柱形部，該圓柱形部至少較刀具台插入 入的連結用嵌入部的深度尺寸長是爲了獲得刀具台與 軸連結部的穩定性。在此圓錐形部的傾斜角爲10〜45 雖同時根據支架軸的長度，最好是15~3 0度的程度。 刀具台雖以設置單一的刀刃爲佳，但是彼此形成 度的位置關係時，構成設置進行粗切削加工的前方側 與進行較此粗切削加工精密加工的後方側刀刃。根據 的構成，僅進行1次的切削加工，即可進行粗加工與 加工的2種加工，可提升切削加工的效率。此時，將 不僅 工的 架軸 軸微 力所 結部 具台 線方 振動 的條 圓錐 時， 作用 ，在 部嵌 支架 度， 180 刀刃 以上 精密 前方 -10- 200936278 側刀刃及後方側刀刃分別安裝在刀刃安裝部上’將該等各 刀刃安裝構件固定在刀具台上。並且，前方側刀刃是形成 較後方側刀刃朝向前方突出位置的構成。前方側刀刃與後 方側刀刃的軸線方向的間隔以支架軸每1次轉動的進刀量 的3 ~ 7倍爲佳。 雖然對於刀刃供給冷卻劑，但是如上述設置2個刀刃 的場合，設置對於該等各刀刃分別各個供給冷卻劑的冷卻 0 劑噴射手段。藉此，可以抑制被加工物及兩刀刃形成高溫 ，並可防止切屑捲入刀刃內。尤其在進行精密加工之後可 抑制刀側工具磨損的最小限，防止切屑的附著，即使進行 重複加工仍然可以維持所需的加工精度。 因應被加工物的形狀等有調整前方側刀刃與後方側刀 刃的間隔的必要，因此，可以位置調整使各刀刃安裝部形 成與支架軸的軸線正交的方向。並且，在支架軸上設置供 給冷卻劑的冷卻劑供給道，但是刀刃安裝構件一旦可調整 φ 位置時’在冷卻劑供給道通過噴射口的冷卻劑通路上，必 須可變更通路長度。因此，使冷卻劑供給道與冷卻劑通路 在各刀刃安裝構件與支架軸的抵接部上開口，構成可經由 通路長度可調整的調整部冷卻劑通路與各開口部連通。 〔發明效果〕 如上述’刀具台可拆裝地連結在支架軸上，藉以形成 可極方便進行該刀具台的更換等的維修，並且可極爲提升 連結時刀具台對於支架軸的固定性，在進行切削加工等， -11 - 200936278 可抑制震顫振動使得刀具台不相對於支架軸振動。 【實施方式】 以下’根據圖示針對本發明的實施形態說明。首先， 第1圖中’ 1爲切削加工裝置的主軸，在該主軸丨上安裝 被加工物2切削加工用的切削工具組3。被加工物2上預 先形成具有預定內徑的鑽孔部2a，該被加工物2是以定位 的狀態被固定在作業台4上。在此狀態下，切削工具組3 藉著被加工物2a內面的切削進行精密加工。因此，使得 連結切削工具組3的主軸1轉動驅動，且進行進退動作， 可設定在作業台4上使被加工物2的鑽孔步2a的中心可 相對於其轉動軸線A-A形成一致。 安裝在主軸1的切削工具組3具有第2圖表示的支架 軸10，該支架軸10的基端部可拆裝地連結在主軸1的主 軸連結部12上，形成在前端側可拆裝地固定刀具台11。 支架軸10上固定刀具台11，因此如第3圖及第4圖表示 ，從支架軸10的前端面形成具有預定深度的圓形凹部所 構成的連結用嵌入部13。 連結·固定在支架軸10的刀具台11，具有：搪頭2〇 可自由拆裝地安裝的主體部14，及從該主體部14延伸的 圓柱型的插入部15，插入部15被嵌入在支架軸10的連結 用嵌入部13內。插入部15的外徑尺寸與連結用嵌入部13 的內徑尺寸是以對於該插入部15的連結用嵌入部13的插 脫不不造成阻礙的程度，其間盡可能不產生間隙的尺寸關 -12- 200936278 係。 如第5圖表示，將刀具台11的插入部15嵌入支架軸 10的連結用嵌入13部時，刀具台11之主體部14的插入 部15突出的底面部與支架軸10的前端面抵接。插入部15 對於連結用嵌入部13的最大嵌入長度是形成至該位置爲 止。並且，如第5圖明白顯示，在該最大嵌入長度狀態， 插入部15的端面與連結用嵌入部13的底面部同樣被維持 φ 在非接觸狀態。因此’刀具台11的插入部15對於連結用 嵌入部13的最大嵌入長度狀態中，形成該刀具台11的主 體部14的下側端面與支架軸10的前端面抵接。 使支架軸1〇與刀具台11抵接的狀態維持著固定用的 連結•固定手段是使用鎖緊螺絲16。該鎖緊螺絲16是從 支架軸10的外圍面側栓插到進入連結用嵌入部13的內部 空間的位置爲止，形成刀具台U之插入部15的卡止。 支架軸1 0設有栓插鎖緊螺絲1 6用的螺孔1 7。螺孔 ❿ 17並非相對於支架軸10的軸線成正交的方向，是相對於 該軸線傾斜的方向穿設。亦即，從支架軸10在外圍面的 開口部朝著連通連結用嵌入部13的位置，在支架軸10的 軸線中，朝著基端側在軸中心方向傾斜。在此，相對於螺 孔17的支架軸10的軸線的角度以槪略45度的程度爲佳 ，但是只要相對於支架軸1〇的軸線傾斜，對於其角度並 不加以特別限制。 另一方面，刀具台11的插入部15在其側面部形成有 卡止凹部18。該卡止凹部18在與插入部15的軸線正交方 -13- 200936278 向形成的剖面爲圓形的凹部。並且，對於該卡止凹部18 的插入部15側面的開口位置在將刀具台11的插入部15 嵌入至支架軸10的連結用嵌入部13時，形成該支架軸1〇 的螺孔1 7的延長位置。 因此，鎖緊螺絲1 6 —旦栓插到螺孔1 7時，鎖緊螺絲 16雖然從支架軸10的孔17進入到刀具台11的卡止凹部 18內，但是鎖緊螺絲16在該卡止部凹部18內形成與其底 φ 面部抵接，該位置爲鎖緊螺絲16的最進入位置，卡止凹 部18的底部中，鎖緊螺絲16的前端抵接的位置爲承接面 18a。在此，在鎖緊螺絲16的前端部形成有朝向前端形成 細的圓錐梯形狀的傾斜部1 6a。該傾斜角是形成與相對於 螺孔1 7相對於支架軸1 0的軸線的角度槪略相同的程度， 即形成45度程度。卡止凹部18在鎖緊螺絲16前端的傾 斜部16a抵接在卡止凹部18的承接面18a時，具有該承 接面18a以外的壁面，即周圍壁或端壁不抵接的開口徑及 φ 深度。另外，也可以使用第6圖表示的鎖緊螺絲116來代 替具有該傾斜部1 6a的鎖緊螺絲1 6。亦即，該鎖緊螺絲 116在其前端部形成球面承接部116a，在該球面承接部 116a內安裝著鋼球體116b。並且，鋼球體116b是將其半 球量以上嵌合在球面承接部116a，並且以切削等的手段使 露出外部的位置的一部份予以平坦面化，形成具有對於承 接面18a之抵接面的構成。 因此，刀具台11安裝在支架軸10時，首先將設置在 刀具台11的插入部15嵌入到支架軸10前端的連結用嵌 -14- 200936278 入部13。此時，調整刀具台η的轉動方向的位置 置在插入部15的卡止凹部18鄰接支架軸1〇側的! 。使刀具台11的主體部14的底面抵接到支架軸] 端面位置爲止，將插入部15嵌入到連結用嵌入部1 在此狀態下’鎖緊螺絲16從支架軸1〇的外圍 插到螺孔17內。螺孔17在連結用嵌入部13的內 ’因此一旦栓入鎖緊螺絲16時’該鎖緊螺絲16從 φ 嵌入部13進入到刀具台11的插入部15的卡止凹g 。將鎖緊螺絲1 6更栓入時，如第5圖所明示，維 於螺孔17的栓緊狀態下，前端的傾斜部16a與卡 18的承接面18a抵接。鎖緊螺絲16在傾斜方向進 抵接在承接面18a的狀態更朝著栓入的方向栓緊時 成刀具台11的插入步15外圍面的卡止凹部18的 將相反側的面按壓再連結用嵌入部13的側面。並 入部15被引進到連結用嵌入部13內，壓接刀具台 〇 主體部14與支架軸10的端面。其結果，在插入部 有引進至第5圖表示連結用嵌入部13內的軸線方 力R與按壓在連結用嵌入部13的側面，與軸線正 的分力F的作用。 如上述，使用1個鎖緊螺絲16，可以使刀具台 對於支架軸10牢固地加以固定。亦即，藉著鎖緊虫 作用於插入部15的分力R，將插入部15引進到連 入部13內，固定使刀具台11不會從支架軸分 且’其結果將刀具台11壓接在支架軸10上，同時 ，使設 曝孔17 1〇的前 3內。 面側栓 面開口 連結用 B 18內 持著對 止凹部 行，從 ，與形 一側是 且，插 11的 :15具 向的分 交方向 '11相 累絲16 結用嵌 離。並 固定在 -15- 200936278 相對於刀具台11的支架軸10相對轉動的方向上。另外， 以鎖緊螺絲16作用在插入部15的方力F，固定在刀具台 的轉動方向及與該轉動方向正交的方向，並同時固定在 傾斜方向。 刀具台11安裝有搪頭20。因此，在第7圖至第10圖 表示搪頭20的構成。在此，第7圖爲搪頭20的前視圖、 第8圖爲上視圖，第9圖及第10圖爲分解構成刀具台11 〇 與搪頭20的刀刃安裝構件21、22的前視圖與上視圖。 刀具台1 1爲前端面形成槪略長方形的構件所構成， 在與其表面側，即插入部1 5的延伸方向的相反側上，可 拆裝地安裝有分別安裝著刀刃23、24的刀刃安裝構件21 '22。爲此在刀具台11的表面左右形成一對及於其長邊 方向全長的凹槽所構成的定位部25。又，刀刃安裝構件 21、22形成有嵌合在該定位部25的突出部21a、22a。另 外，刀具台11在其定位部25的兩側設有各一對構成的螺 © 孔26、27，刀刃安裝構件21、22設有鎖緊螺絲28、29插 通用的長孔30、31。刀刃安裝部21、22將該等的突出部 2la、22a卡合在設於刀具台11的定位部25上，將鎖緊螺 絲28、29栓插在螺孔26、27藉此固定在預定的位置上。 以長孔3 0、3 1作爲刀刃安裝構件2 1、22的鎖緊螺絲28、 29的插穿部，各刀刃安裝構件21、22可相對於支架軸1〇 的軸中心形成半徑方向的位置可調整固定的構成。 刀刃安裝構件21、22設有刀刃固定部32、33，該等 刀刃固定部32、33安裝有刀刃23、24。在此，.刀刃23與 -16- 200936278 刀刃24是使得刀刃23 —方朝向支架軸10的轉動軸線A 的前方僅突出間隔L量。藉此，在被加工物2切削加工時 ，切削23的一側先開始切削，使得該刀刃23在僅間隔L 量前進之後形成開始藉著刀刃24的切削。因此，刀刃23 爲前方側刀刃，且刀刃24形成爲後方側刀刃。 在此，前方側刀刃23是如第1 1(a)圖表示，形成在橫 向刀刃23a與前刀刃23b之間的圓弧部是形成刀尖23c， φ 並且如第1 1(b)圖表示，比較形成有構成後方側刀刃24的 橫向刀刃24a與前刀刃24b之間的刀尖24c的圓弧部之該 等刀尖23c、24c的曲率半徑Rl、R2即尖端半徑時，後方 側刀刃24側的曲率半徑R2形成曲率半徑R1的大約一半 左右，後方側刀刃24側是形成較前方側刀刃23尖的形狀 〇 安裝刀刃23、25的刀刃安裝部21、22是藉著鎖緊螺 絲28、29預先固定在搪頭20的刀具台1 1上。該搪頭20 ❹ 雖被固定在刀具台11，將此刀具台11連結在支架軸10上 ’但是藉1個鎖緊螺絲16將刀具台11相對於支架軸10 牢固地固定。並且，根據鎖緊螺絲16作用在插入部15的 分力R’將插入部15引進到連結用嵌入部13內，固定使 刀具台11不致從支架軸10分離。又，其結果將刀具台11 壓接在支架軸10上，同時固定在對於刀具台U的支架軸 1〇相對轉動的方向。另外，以鎖緊螺絲16作用於插入部 15的分力F’固定在刀具台11的轉動方向及與此轉動方 向正交的方向，並固定在傾斜方向。 -17- 200936278 如上述，刀具台11被牢固地固定在支架軸10上，藉 著切削加工裝置進行被加工物2的鑽孔部2a內面的切削 加工時，刀具台11不會相對於支架軸10產生振動，可維 持極爲穩定的狀態。此外，相對於被加工物2的主軸1的 1次前進動作，以前方側刀刃23進行該被加工物2的鑽孔 部2a內面的粗加工，並以後方側刀刃24進行精密加工。 爲了抑制切削加工時切削阻力造成支架軸1 0的振動 ，及震顫振動的產生，支架軸10的前端側部份具有包含 其全長的預定長度量爲一定外徑的圓柱形部10a，對於主 軸連結部12的連結側是形成其外徑爲連續的大的圓錐形 部l〇b。藉此，支架軸10在前端側的圓柱形部10a的部份 ，其剛性在軸線方向是形成均一之主軸連結部1 2側的圓 錐形部1 Ob則是隨著朝向該主軸連結部1 2側形成連續性 大的剛性。 在此，使支架軸1〇跨其軸線方向的全長形成均一的 剖面形狀時，該支架軸10的固有頻率與作用在該支架軸 10的高次模組振動的關係雖然會有特定振動增幅的可能性 ，但是從支架軸10的途中朝著固定在主軸的位置可連續 性提升其剛性，因此形成振動峰値的分散。並且，由於上 述分散後的頻率的彼此作用可同時發揮振動衰減功能而可 抑制其震顫振動。 爲了獲得振動峰値的良好分散功能，總合考慮支架軸 10的全長及圓柱形部la的外徑尺寸與根據其剛性及切削 阻力產生的振動，可得知在實驗上圓錐形部1 b的傾斜角 -18- 200936278 設定在15〜39度程度爲有效。實際上，從被加工物的鑽孔 部深度及孔徑與支架軸10的全長及形成最大徑的位置等 一旦槪略設定爲1/5 ~1/2程度時，震顫振動的抑制上有顯 著的效果。 切削加工中，朝著前方側刀刃23及後方側刀刃24的 刀尖23c、24c以高壓噴灑切削油劑的霧狀所構成的冷卻 劑，冷卻切削位置的同時提高潤滑性，並可快速地除去因 切削產生的切屑。因此，刀刃安裝構件21、22上，在其 刀刃固定部32、33的附近，開設朝著直接作用於被加工 物2的鑽孔部2a內面的刀尖24a、25c噴射冷卻劑的噴射 口 34、35。對於該等噴射口 34、35的冷卻劑的供給是從 主軸1的內部經由形成在支架軸1 〇的軸中心部的冷卻劑 供給道36b及經由穿設於刀具台11的插入部15的冷卻劑 工給到36b加以進行。 冷卻劑供給道3 6b與噴射口 3 4、3 5之間的連通是如 以下進行。冷卻劑供給道3 6b是在刀具台1 1內分枝爲一 次側冷卻劑通路37、38’與調整部冷卻劑通路39、40連 通。並且，調整部冷卻劑通路39、40連通有在刀刃安裝 部構件2 1、22內與噴射口 34、3 5連通的二次側冷卻劑通 路41、42。調整部冷卻劑通路39、40在定位部25的左右 兩側形成與該定位部2 5平行，以刀具台1 1側的凹槽3 9 a 、39b與刀刃安裝構件21、22側的凹槽40a、40b構成分 爲兩半的通路。一次側冷卻劑通路37、38是與凹槽39a、 3 9b，二次側冷卻劑通路41、42是與凹槽40a、40b分別 -19- 200936278 連通。 因此，刀具台1 1側的一次側冷卻劑通路3 7、3 8長 地在刀具台1 1側的凹槽39a、40a開口’並且二次側冷 劑通路41、42是與分別設置在刀刃安裝構件21、22的 槽39b、40b連通。藉此，刀刃安裝構件21、22在刀具 11中，位置調整與轉動軸線A正交的方向時，一次側 卻劑通路37、38可經由調整部冷卻劑通路39、40經常 與二次側冷卻劑通路41、42連通。 在被加工物2加工時，由於刀刃安裝構件21、22 線方向的位置有位差，首先以前方側刀刃23切削鑽孔 2a的內面，接著以後方側刀刃24進行切削加工。該切 加工一但開始時，從噴射口 34、35朝著前方側刀刃23 後方側刀刃24噴射冷卻劑。因此，在該等前方側刀刃 及後方側刀刃2 4中，特別冷卻與被加工物2接觸的刀 23c、24c的同時，在被加工物2的鑽孔部2a，同時形 該等刀尖23a、24c切削的位置的冷卻。 前方側刀刃23由於其尖端半徑大，進行粗切削。 軸1的進刀速度是根據後方側刀刃24進行切削而設定 當的進刀速度，藉著搪頭20的轉動使前方側刀刃23的 削區域一部份並行進行粗切削加工。並且，前方側刀刃 在進行5轉動量之後’後方側刀刃2 4切削前方側刀刃 進行切削加工的位置。該後方側刀刃24的刀尖24c的 端半徑是形成前方側刀刃23的尖端半徑的一半，因此 進行更細的切削。其結果，被加工物2的鑽孔部2a的 時 卻 凹 台 冷 地 軸 部 削 及 23 尖 成 主 適 切 23 23 尖 可 內 -20- 200936278 面可進行極精密的加工。 上述的實施形態中，支架軸10的前端面與刀j 的主體部14底面的抵接面雖是形成平面形狀，以 絲1 6的作用壓接，固定使其不相對轉動，但是也 有防止機械性相對轉動的機構。 亦即，也可以如第12圖及第13圖表示，支架 的端面210a及從刀具台211的主體部214朝下方 插入部215延伸的底面214a上形成凹凸部，使得 210的端面210a與刀具台211的主體部214的底i 抵接時，卡合該等的凹凸部。例如，在刀具台211 面214a形成突條220，另一方面在支架軸210前端 210a上形成對應該突條220的凹部221。藉此，以 211的插入部215嵌入到支架軸210的連結用嵌入 的狀態下，使突條220與凹部221咬合，藉此刀具 可正確地相對於支架軸210進行方向調整。 支架軸210 —旦連結刀具台211時，藉著形成 抵接面的端面210a與底面214a上的凹部221與突 的卡合，將刀具台211牢固地固定在從連結用嵌入 拔出其插入部215的方向與凹部221及突條220延 以外的移動。並且，對於鎖緊螺絲之刀具台211的 2 1 0的固定性良好，因此加工中可明顯提高從支架 到刀尖爲止整體的穩定性。 I：台 11 鎖緊螺 可以具 軸210 延伸的 支架軸 g 2 14a 側的底 的端面 刀具台 部213 台211 在該等 條220 部213 伸方向 支架軸 軸 210 -21 - 200936278 【圖式簡單說明】 第1圖是表示本發明的第1實施形態，表示切削加工 裝置整體構成的說明圖。 第2圖是表示支架軸與刀具台的組合狀態的前視圖。 第3圖是以刀具台對於支架軸連結前狀態的一部份剖 面表示的主要部放大前視圖。 第4圖爲第3圖的右側視圖。 第5圖是表示將刀具台連結到支架軸的狀態的主要部 放大剖視圖。 第6圖是表示與本發明第2實施形態的第3圖相同的 圖。 第7圖爲搪頭的前視圖。 第8圖爲第7圖的上視圖。 第9圖是將第7圖的台座部與工具安裝部分離的圖。 第1〇圖是將第7圖的台座部與工具安裝部分離的圖 〇 第11圖爲使用2種類切削工具的主要部放大圖。 第1 2圖是表示鎖緊螺絲的其他構成例的剖視圖。 第13圖爲本發明第2實施形態的支架軸前端側的端 面圖。 【主要元件符號說明】 1 :主軸 2 :被加工物 -22- 200936278 2a :鑽孔部 3 :切削工具組 4 :作業台 10 :支架軸 1 0 a ·圓柱形部 l〇b :圓錐形部 11 ·刀具台 1 2 :主軸連結部 13 :連結用嵌入部 14 :主體部 1 5 ·插入部 1 6 :鎖緊螺絲 1 6 a .傾斜部 1 7 :螺孔 18 :卡止凹部 1 8 a :承接面 2 〇 :搪頭 21、22 :刀刃安裝構件 21a、22a :突出部 23、24 :刀刃 23a :橫向刀刃 23b :前刀刃 23c :刀尖 24a :橫向刀刃 -23 200936278 24b :前刀刃 24c :刀尖 2 5 :定位部 2 6、2 7 :螺孔 2 8、2 9 :鎖緊螺絲 3 0、3 1 :長孔 3 2、3 3 :刀刃固定部 3 4、3 5 :噴射口 36a、36b :冷卻劑供給道 3 7、3 8 : —次側冷卻劑通路 39、40 :調整部冷卻劑通路 39a 、 39b、 40a 、 40b ：凹槽 41、42 :二次側冷卻劑通路 1 1 6 :鎖緊螺絲 116a:球面承接部 1 1 6b :鋼球體 21 0 :支架軸 2 1 0 a :端面 21 1 :刀具台 2 1 4 :主體部 2 1 4a :底面 2 1 5 :插入部 220 :突條 22 1 :凹部 -24- 200936278 F :分力 R 1、R 2 :曲率半徑For the D tool, for example, the boring tool is a bracket shaft having a joint portion that is detachably attached to the main shaft, and a cutter table on which the blade is attached is provided at the front end of the bracket shaft. A configuration in which the tool holder is detachably coupled to a bracket shaft is disclosed in Japanese Laid-Open Patent Publication No. 2550,328, to form a replaceable cutter table. According to the connection structure of the conventional document, a coupling fitting portion having a distal end surface opening is formed at a front end portion of the stent shaft, and an insertion portion is provided to extend over the tool holder. The insertion portion is formed in a substantially densely fitted state with respect to the fitting fitting portion, and the tool holder is coupled to the holder shaft. On the other hand, the base end side of the bracket shaft is provided with a coupling member for the main shaft. The tool table is fixedly fixed relative to the bracket shaft, not only to be detached from the bracket shaft, but also to be connected so that the bracket shaft does not rotate relative to the tool table. For this reason, the insertion portion of the insertion portion of the tool holder and the attachment portion for the bracket shaft forms a flat portion in the axial direction, and the insertion portion is fitted into the connection fitting portion of the holder shaft in a state where the positions of the flat portions are fitted. Further, a side surface of the bracket shaft is formed with a screw hole orthogonal to the axis thereof, and a locking screw is inserted into the screw hole from a peripheral surface of the bracket shaft. The front end of the locking screw -5-200936278 is abutted on the outer surface of the tool inserting portion, so that the tool table is not detached from the shaft and fixed so that the tool holder is not subjected to the cutting process. [Inventive content] Problem] However, when the workpiece is cut by the blade provided during the rotation of the drive shaft, a chatter vibration due to the cutting resistance is generated. When the tremor is generated, fine irregularities are formed on the inner wall of the hole of the workpiece, and the machining accuracy and the like are lowered. The tremor vibration is caused by the blade provided to the action portion of the workpiece in the long-sized bracket, and when the stent is raised, it can be suppressed to some extent. However, the shape of the support depends on the workpiece, for example, when it is inserted through the hole of the workpiece and the hole is deep, and the diameter of the small support shaft is relatively small. Therefore, the support shaft does not have sufficient vibration suppression to make the chatter vibration more significant. In order to prevent or even reduce the above tremor vibration, it is put into practice and put into practical use. It is also known that the mounting portion of the tool table that enlarges the bracket shaft is improved by the rigidity, and the structure is eliminated on the bracket shaft to eliminate the vibration of the chatter vibration. Further, the overall shape of the bracket shaft, that is, the tapered shape of the diameter of the front end, is also a shape that causes the axial direction to be rigid. To move from the bracket intentionally, the vibration of the tool post during machining, etc., makes the front end shaft of the shaft rigid in the shape of the shaft, the aperture is small and the rigidity of the long length, and various kinds of heads are oscillating, and the components are composed of The degree of orientation change -6- 200936278 In this case, the inventor of the present invention has made an effort to investigate the cause of the tremor vibration of the stent shaft, not only according to the cutting resistance of the blade to the workpiece, but also to the cutter table of the bracket shaft. The manner in which the connection is obtained, the generation of the chatter vibration is extremely poor, and the present invention is completed. The tool table and the bracket shaft are formed as a single member or as a separate member, which can be substantially integrated. When the above configuration is formed, vibration due to the relative movement between the holder shaft and the tool holder is not generated. This point is such that the tool table is integrated with the bracket shaft and produces less vibration than the disassembly vibration. However, in the machining of the tool, the tool table is subjected to an excessive load, so there is a possibility of damage in each part. Therefore, it is necessary to remove the tool table for repair and maintenance, or to replace the tool table. When the tool table is integrated with the bracket shaft, the entire bracket shaft must be replaced. Further, when the tool table is not separated from the bracket shaft, since the tool holder of another structure cannot be attached to the bracket shaft, the bracket shaft Φ is not versatile. As described above, the attachment of the tool holder to the holder shaft is preferably as disclosed in Japanese Laid-Open Patent Publication No. 25-50038, which is incorporated herein by reference. However, from the side of the tremor 'vibration suppression, it is not advantageous for the bracket shaft and the tool table to be replaceable. In other words, when the insertion portion of the tool holder is fitted into the coupling fitting portion of the holder shaft and fixed by the locking screw, a gap is generated in the fitting portion, which causes a chatter vibration. In addition, during the period in which the tool is continuously used, the fitting portion of the detaching portion and the connecting fitting portion may be deformed or the result of the grinding may be broken, such as the damage of the hole, and the gap may be expanded, and the tool table may be unstable and formed to be larger. The problem of tremor vibration. The present invention has been made in view of the above points, and an object thereof is to detachably couple a tool holder to a holder shaft to form a replaceable tool holder, and to suppress chatter vibration during operation. [Means for Solving the Problem] In order to achieve the above object, the present invention comprises a holder shaft that is detachably attachable to a spindle coupling portion coupled to a spindle at a proximal end portion, and a cutter table to which a blade is attached, and the cutter table is detachable A cutting tool that is fixed to a tip end of the holder shaft, wherein the holder shaft is formed with a coupling fitting portion formed by a concave portion from a distal end surface thereof toward an axial direction, and the cutter holder is provided with the coupling for insertion In the insertion portion of the insertion portion, one end of the holder shaft is open on the outer peripheral surface, and the other end is formed with a screw hole that communicates with the connection fitting portion, and the screw hole extends from the opening portion of the outer peripheral surface to the communication portion of the connection insertion portion. The insertion portion is formed with a locking recess that is open to the side surface of the bracket shaft, and the locking screw that is inserted into the screw hole is configured to abut against the locking recess receiving surface. The tool holder is detachably coupled to the coupling portion for fitting the insertion portion to the bracket shaft. Although the locking screw is fixedly used in this joint state, the bolting direction of the locking screw is not perpendicular to the axis of the bracket shaft, but is formed to be inclined toward the base end side in the axial direction from the peripheral surface side of the bracket shaft. The direction of the drooping. Therefore, the screw hole is set to a predetermined inclination angle in advance. Thereby, in the state in which the tool table is assembled to the bracket shaft, the locking screw -8 - 200936278 is inserted into the screw hole, and the front end of the locking screw is guided into the locking recess provided in the tool holder, so that the card The bottom surface of the recessed portion forms a receiving surface. As a result, the locking screw abuts against the receiving surface to form a pressing force in two directions. That is, the end surface on the extension side of the insertion portion of the tool holder is pressed against the front end surface of the holder shaft, and the outer peripheral surface of the insertion portion is pressed against the inner side surface of the coupling portion insertion portion. Therefore, when the locking screw is locked in this direction, 'by the pressing force of the locking screw, the insertion portion has a component force in the direction of the coupling insertion portion toward the bracket φ axis and is embedded in the coupling direction. The component of the component in the lateral direction is firmly fixed. In order to make the pressing force of the locking screw more reliably received by the receiving surface of the locking recess of the insertion portion, the abutting area therebetween is increased. Therefore, a tapered trapezoidal inclined portion is provided at the front end of the locking screw, and the inclined portion can be abutted on the receiving surface. Further, it is also possible to use a steel ball which is slidable in any direction at the front end portion of the locking screw, and a part of the steel ball is formed to abut against the flat surface of the receiving surface. φ As described above, the insertion portion is introduced into the coupling fitting portion of the holder shaft, so that the end surface on the extending side of the insertion portion of the cutter table abuts on the front end surface of the holder shaft. Therefore, the abutment of the abutting faces when the tool holder is attached to the bracket shaft is fixed in the coupled state. Further, the strong fixing property between the fitting portion of the bracket shaft and the insertion portion of the cutter table is achieved by the action of pressing the insertion portion on the side of the coupling insert portion. When the tool holder is fixed in the connected state, increase the locking force of the locking screw. Further, the frictional force therebetween can be increased by roughening the abutting surface of the tool table and the bracket shaft, or forming unevenness or the like which is engaged with each other. As a result, the fixing of the tool holder to the abutment state of the bracket shaft can be improved by -9-200936278. Therefore, the detachable tool table and the bracket shaft can substantially prevent or even suppress the vibration of the tool table relative to the support during the cutting force of the workpiece, and can eliminate one cause of the chatter vibration. As described above, although it is possible to suppress the vibration of the holder from being detachably attached to the holder, it is conical to form the side of the holder shaft with respect to the main axis from the viewpoint of suppressing the chattering vibration due to the cutting resistance of the cutting edge during machining. Preferably, the cylindrical portion is connected to the conical portion, and the knives are preferably formed to be coupled to the cylindrical portion. When the stent shaft forms a uniform cross-sectional shape over the entire length of the shaft, there is a possibility that the specific vibration of the bracket shaft is increased in accordance with the vibration frequency of the bracket shaft vibration generated by the cutting process. However, by providing the inclined portion as the inclined portion, the rigidity change in the axial direction of the holder shaft can disperse the peak of the vibration, and the vibration frequency can be dispersed and the vibration attenuation function can be suppressed, so that the chatter vibration can be further suppressed. Further, the front end side is provided with a cylindrical portion which is at least longer than the depth dimension of the joint fitting portion into which the cutter table is inserted in order to obtain stability of the cutter table and the shaft joint portion. The inclination angle of the conical portion is 10 to 45, and it is preferably 15 to 30 degrees depending on the length of the stent shaft. The tool table is preferably provided with a single blade. However, when forming a positional relationship with each other, the front side of the rough cutting process and the rear side cutting edge for performing the rough machining are formed. According to the configuration, only two types of cutting can be performed, and two types of roughing and machining can be performed, and the efficiency of cutting can be improved. At this time, when the beam is not only the micro-force of the machine shaft, but also the strip-shaped cone of the vibration of the line, the function is in the range of the bracket, and the precision of the front edge is more than 180. -10-200936278 The side blade and the rear blade are respectively mounted on the blade. On the blade attachment portion, the blade attachment members are fixed to the tool holder. Further, the front side cutting edge has a configuration in which the rear side cutting edge protrudes toward the front side. The interval between the front side cutting edge and the rear side cutting edge in the axial direction is preferably 3 to 7 times the amount of the feeding of the holder shaft per one rotation. Although the coolant is supplied to the blade, when two blades are provided as described above, a cooling agent spraying means for supplying the coolant to each of the blades is provided. Thereby, it is possible to suppress the formation of a high temperature between the workpiece and the two blades, and it is possible to prevent the chips from being caught in the blade. In particular, after precision machining, the minimum limit of tool side tool wear can be suppressed, and chip adhesion can be prevented, and the required machining accuracy can be maintained even if the machining is repeated. Since it is necessary to adjust the interval between the front side blade and the rear side blade in accordance with the shape of the workpiece, the position adjustment can be made such that each blade attachment portion is formed in a direction orthogonal to the axis of the holder shaft. Further, a coolant supply path for supplying the coolant is provided on the holder shaft, but once the blade attachment member can adjust the position φ, the length of the passage must be changed in the coolant passage through which the coolant supply passage passes. Therefore, the coolant supply passage and the coolant passage are opened at the abutting portions of the blade attachment members and the holder shaft, and the adjustment portion coolant passage that can be adjusted via the passage length communicates with the respective opening portions. [Effect of the Invention] As described above, the tool holder is detachably coupled to the holder shaft, so that maintenance such as replacement of the tool holder can be easily performed, and the fixing of the cutter table to the bracket shaft during the connection can be extremely improved. For cutting, etc., -11 - 200936278 The tremor vibration can be suppressed so that the tool table does not vibrate relative to the bracket shaft. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in the first drawing, '1' is the main shaft of the cutting apparatus, and the cutting tool group 3 for cutting the workpiece 2 is attached to the spindle. A drilled portion 2a having a predetermined inner diameter is formed in advance on the workpiece 2, and the workpiece 2 is fixed to the work table 4 in a state of being positioned. In this state, the cutting tool group 3 is precision machined by the cutting of the inner surface of the workpiece 2a. Therefore, the main shaft 1 to which the cutting tool set 3 is connected is rotationally driven, and the forward and backward movement is performed, and the center of the drilling step 2a of the workpiece 2 can be set on the work table 4 so as to be aligned with respect to the rotation axis A-A thereof. The cutting tool set 3 attached to the main shaft 1 has a bracket shaft 10 shown in Fig. 2, and a base end portion of the bracket shaft 10 is detachably coupled to the main shaft coupling portion 12 of the main shaft 1, and is detachably formed at the front end side. The tool holder 11 is fixed. Since the tool holder 11 is fixed to the holder shaft 10, as shown in Figs. 3 and 4, the connection fitting portion 13 is formed by forming a circular recess having a predetermined depth from the front end surface of the holder shaft 10. The tool holder 11 that is coupled and fixed to the holder shaft 10 has a main body portion 14 that is detachably attached to the head 2, and a cylindrical insertion portion 15 that extends from the main body portion 14. The insertion portion 15 is embedded in The coupling shaft 10 is inserted into the fitting portion 13. The outer diameter dimension of the insertion portion 15 and the inner diameter dimension of the coupling fitting portion 13 are not hindered by the insertion and removal of the coupling fitting portion 13 of the insertion portion 15, and the size of the gap is not generated as much as possible - 12- 200936278 Department. As shown in Fig. 5, when the insertion portion 15 of the tool holder 11 is fitted into the connection fitting portion 13 of the holder shaft 10, the bottom surface portion of the insertion portion 15 of the main body portion 14 of the tool holder 11 abuts against the front end surface of the holder shaft 10. . The maximum insertion length of the insertion portion 15 for the connection fitting portion 13 is formed to this position. Further, as is apparent from Fig. 5, in the state of the maximum insertion length, the end surface of the insertion portion 15 is maintained in the non-contact state in the same manner as the bottom surface portion of the connection fitting portion 13. Therefore, in the state in which the insertion portion 15 of the tool holder 11 is in the maximum insertion length of the coupling fitting portion 13, the lower end surface of the main body portion 14 forming the tool holder 11 abuts against the front end surface of the holder shaft 10. The state in which the holder shaft 1〇 is brought into contact with the tool holder 11 is maintained for fixing. The fixing means is to use the locking screw 16. The locking screw 16 is inserted from the outer peripheral side of the bracket shaft 10 to the position of the inner space of the connecting fitting portion 13, and the locking portion 15 of the tool post U is locked. The bracket shaft 10 is provided with a screw hole 17 for bolting the locking screw 16. The screw holes 17 are not orthogonal to the axis of the holder shaft 10, and are bored in a direction inclined with respect to the axis. In other words, from the opening of the outer peripheral surface of the bracket shaft 10 toward the communication coupling portion 13, the axis of the holder shaft 10 is inclined toward the proximal end side in the axial center direction. Here, the angle with respect to the axis of the bracket shaft 10 of the screw hole 17 is preferably about 45 degrees, but the angle is not particularly limited as long as it is inclined with respect to the axis of the bracket shaft 1〇. On the other hand, the insertion portion 15 of the tool holder 11 is formed with a locking recess 18 at its side surface portion. The locking concave portion 18 has a circular concave portion in a cross section formed in a direction orthogonal to the axis of the insertion portion 15 from -13 to 200936278. Further, when the insertion position of the side surface of the insertion portion 15 of the locking recess 18 is fitted into the coupling fitting portion 13 of the holder shaft 10, the screw hole 17 of the holder shaft 1 is formed. Extend the position. Therefore, when the locking screw 16 is inserted into the screw hole 17 , the locking screw 16 enters into the locking recess 18 of the tool holder 11 from the hole 17 of the bracket shaft 10, but the locking screw 16 is on the card. The bottom portion of the stopper recess 18 is abutted against the bottom surface portion of the locking screw 16, and the position of the locking recess portion 18 is the receiving surface 18a. Here, the tip end portion of the lock screw 16 is formed with an inclined portion 16a that is formed in a tapered shape toward the tip end. The inclination angle is formed to the same extent as the angle with respect to the axis of the screw hole 17 with respect to the axis of the holder 10, i.e., to a degree of 45 degrees. When the inclined portion 16a at the tip end of the locking screw 16 abuts against the receiving surface 18a of the locking recess 18, the locking recess 18 has a wall surface other than the receiving surface 18a, that is, an opening diameter and a diameter at which the peripheral wall or the end wall does not abut. depth. Alternatively, the locking screw 116 shown in Fig. 6 may be used instead of the locking screw 16 having the inclined portion 16a. That is, the lock screw 116 has a spherical receiving portion 116a formed at the front end portion thereof, and a steel ball 116b is attached to the spherical receiving portion 116a. In addition, the steel ball 116b is fitted to the spherical receiving portion 116a by a hemispherical amount or more, and a portion of the position where the outside is exposed is flattened by means of cutting or the like to form an abutting surface with respect to the receiving surface 18a. Composition. Therefore, when the tool holder 11 is attached to the holder shaft 10, the insertion portion 15 provided in the tool holder 11 is first fitted into the connection fitting portion 13 of the front end of the holder shaft 10. At this time, the position in which the rotational direction of the tool table η is adjusted is set so that the locking concave portion 18 of the insertion portion 15 abuts the side of the stent shaft 1〇. The insertion portion 15 is fitted into the connection fitting portion 1 so that the bottom surface of the main body portion 14 of the tool holder 11 abuts against the end surface of the holder shaft. In this state, the locking screw 16 is inserted into the snail from the periphery of the holder shaft 1〇. Inside the hole 17. The screw hole 17 is inside the coupling fitting portion 13 so that once the locking screw 16 is inserted, the locking screw 16 enters the locking recess g of the insertion portion 15 of the cutter table 11 from the φ insertion portion 13. When the locking screw 16 is further inserted, as shown in Fig. 5, in the bolted state of the screw hole 17, the inclined portion 16a of the front end abuts against the receiving surface 18a of the card 18. When the locking screw 16 is abutted against the receiving surface 18a in the oblique direction and is tightened in the direction of the insertion, the surface of the locking recess 18 on the outer peripheral surface of the inserting step 15 of the cutter table 11 is pressed and reconnected. The side of the embedding portion 13. The insertion portion 15 is introduced into the connection fitting portion 13, and the cutter head main body portion 14 and the end surface of the holder shaft 10 are crimped. As a result, in the insertion portion, the axial force R introduced in the connection fitting portion 13 and the component force F which is pressed against the side surface of the coupling fitting portion 13 and which is positive with respect to the axis are introduced. As described above, the tool holder can be firmly fixed to the holder shaft 10 by using one of the locking screws 16. That is, the insertion portion 15 is introduced into the merging portion 13 by the component force R acting on the insertion portion 15 by the locking insect, so that the cutter table 11 is not divided from the holder shaft and the result is that the cutter table 11 is crimped. On the support shaft 10, at the same time, the first 3 holes of the exposure hole 17 1 使 are provided. Face side plug opening The connecting B 18 holds the opposite recessed line, and the pair is formed on the side of the shape, and the insertion direction of the 15th direction is the '11 phase. And fixed in the direction of relative rotation of the bracket shaft 10 of the tool table 11 at -15-200936278. Further, the square force F acting on the insertion portion 15 by the lock screw 16 is fixed to the rotation direction of the cutter table and the direction orthogonal to the rotation direction, and is fixed at the same time in the oblique direction. The cutter table 11 is equipped with a boring head 20. Therefore, the configuration of the hammer head 20 is shown in Figs. 7 to 10 . Here, Fig. 7 is a front view of the boring head 20, and Fig. 8 is a top view, and Figs. 9 and 10 are front views of the blade mounting members 21, 22 which are formed to decompose the turret 11 and the boring head 20, and Top view. The tool holder 11 is formed of a member having a substantially rectangular shape on the front end surface, and is attached to the blade side of the surface side, that is, on the side opposite to the extending direction of the insertion portion 15 with the blades 23 and 24 attached thereto. Member 21 '22. For this purpose, a pair of positioning portions 25 formed by grooves on the left and right sides of the longitudinal direction of the cutter head 11 are formed. Further, the blade attachment members 21 and 22 are formed with projections 21a and 22a fitted to the positioning portion 25. Further, the cutter table 11 is provided with a pair of screw holes 26 and 27 formed on both sides of the positioning portion 25, and the blade attachment members 21 and 22 are provided with long holes 30 and 31 into which the lock screws 28 and 29 are inserted. The blade mounting portions 21, 22 engage the protruding portions 21a, 22a on the positioning portion 25 provided on the tool holder 11, and the locking screws 28, 29 are inserted into the screw holes 26, 27 to be fixed at predetermined positions. Location. With the long holes 30, 31 as the insertion portions of the locking screws 28, 29 of the blade mounting members 2, 22, the blade mounting members 21, 22 can be formed in a radial direction with respect to the axis center of the bracket shaft 1? The fixed configuration can be adjusted. The blade attachment members 21, 22 are provided with blade fixing portions 32, 33 to which the blade edges 23, 24 are attached. Here, the blade 23 and the -16-200936278 blade 24 are such that the blade edge 23 protrudes toward the front side of the rotation axis A of the holder shaft 10 by only a gap L. Thereby, at the time of cutting of the workpiece 2, the side of the cutting 23 is first cut so that the cutting edge 23 starts cutting by the cutting edge 24 after advancing only by the interval L amount. Therefore, the blade 23 is the front side blade, and the blade 24 is formed as the rear side blade. Here, the front side cutting edge 23 is as shown in Fig. 1(a), and the circular arc portion formed between the lateral cutting edge 23a and the front cutting edge 23b is formed to form the cutting edge 23c, φ and is shown in Fig. 1(b) When the curvature radiuses R1 and R2 of the blade edges 23c and 24c forming the arcuate portion of the blade edge 24c between the lateral blade 24a and the front blade 24b forming the rear blade 24 are formed, the tip radius 24, the rear blade 24 is compared. The curvature radius R2 of the side forms about half of the radius of curvature R1, and the side of the blade edge 24 of the rear side is formed in a shape that is sharper than the tip of the front side blade 23. The blade attachment portions 21, 22 of the attachment blades 23, 25 are by the locking screw 28, 29 is fixed in advance on the tool table 11 of the boring head 20. The boring head 20 固定 is fixed to the tool holder 11 and the tool holder 11 is coupled to the holder shaft 10 ′, but the tool holder 11 is firmly fixed to the holder shaft 10 by a locking screw 16 . Then, the insertion portion 15 is introduced into the connection fitting portion 13 by the component force R' acting on the insertion portion 15 by the lock screw 16, and is fixed so that the cutter table 11 is not separated from the holder shaft 10. Further, as a result, the tool holder 11 is crimped to the holder shaft 10 while being fixed in the direction of relative rotation of the holder shaft 1 of the tool holder U. Further, the component force F' acting on the insertion portion 15 by the lock screw 16 is fixed to the rotation direction of the cutter table 11 and the direction orthogonal to the rotation direction, and is fixed in the oblique direction. -17- 200936278 As described above, when the tool holder 11 is firmly fixed to the holder shaft 10, and the cutting processing is performed on the inner surface of the drilled portion 2a of the workpiece 2, the cutter table 11 does not move relative to the holder. The shaft 10 generates vibration and maintains an extremely stable state. In the first forward movement of the main shaft 1 of the workpiece 2, the inner surface of the drilled portion 2a of the workpiece 2 is roughened by the front side cutting edge 23, and the rear side cutting edge 24 is precision machined. In order to suppress the vibration of the bracket shaft 10 and the generation of the chattering vibration due to the cutting resistance during the cutting process, the front end side portion of the bracket shaft 10 has a cylindrical portion 10a having a predetermined length and a predetermined outer diameter thereof, for the spindle connection. The joint side of the portion 12 is formed into a large conical portion 10b whose outer diameter is continuous. Thereby, the portion of the bracket shaft 10 on the front end side of the cylindrical portion 10a whose rigidity is formed in the axial direction to form the uniform side of the main shaft coupling portion 1 2 is the direction toward the main shaft coupling portion 1 2 The side forms a rigidity with a large continuity. Here, when the stent shaft 1 is formed into a uniform cross-sectional shape over the entire length in the axial direction, the relationship between the natural frequency of the stent shaft 10 and the vibration of the high-order module acting on the stent shaft 10 may be increased by a specific vibration. It is possible, however, that the rigidity can be continuously increased from the middle of the support shaft 10 toward the position fixed to the main shaft, thus forming a dispersion of the vibration peak. Further, since the frequencies after the dispersion described above can simultaneously exhibit the vibration damping function, the chatter vibration can be suppressed. In order to obtain a good dispersion function of the vibration peak ,, the total length of the stent shaft 10 and the outer diameter dimension of the cylindrical portion la and the vibration generated according to the rigidity and the cutting resistance are considered, and the experimentally conical portion 1 b is known. Tilt angle -18- 200936278 Set to be effective at 15 to 39 degrees. In fact, when the depth and the diameter of the drilled portion of the workpiece and the entire length of the stent shaft 10 and the position at which the maximum diameter is formed are set to a level of about 1/5 to 1/2, the suppression of the chatter vibration is remarkable. effect. In the cutting process, the cutting edges 23c and 24c of the front side cutting edge 23 and the rear side cutting edge 24 are sprayed with a coolant having a high pressure by cutting the oil agent, and the lubricating position is improved while the cutting position is cooled, and the lubricating property can be quickly removed. Chips due to cutting. Therefore, in the blade attachment members 21 and 22, in the vicinity of the blade fixing portions 32 and 33, the ejection ports for injecting the coolant toward the blade tips 24a and 25c which directly act on the inner surface of the drilled portion 2a of the workpiece 2 are opened. 34, 35. The supply of the coolant to the injection ports 34 and 35 is from the inside of the main shaft 1 via the coolant supply passage 36b formed at the shaft center portion of the bracket shaft 1 及 and through the insertion portion 15 penetrating the cutter table 11 The agent gave it to 36b. The communication between the coolant supply path 36b and the injection ports 3 4, 3 5 is performed as follows. The coolant supply passages 36b are branched into the primary coolant passages 37, 38' in the cutter table 1 to communicate with the regulator coolant passages 39, 40. Further, the adjustment portion coolant passages 39, 40 communicate with the secondary coolant passages 41, 42 that communicate with the injection ports 34, 35 in the blade attachment portion members 21, 22. The adjustment portion coolant passages 39, 40 are formed in parallel with the positioning portion 25 on the left and right sides of the positioning portion 25, and the grooves 3 9 a , 39b on the cutter table 1 1 side and the grooves on the blade mounting members 21 and 22 side. 40a, 40b constitute a path divided into two halves. The primary side coolant passages 37, 38 are in communication with the grooves 39a, 39b, and the secondary side coolant passages 41, 42 are in communication with the grooves 40a, 40b, respectively, -19-200936278. Therefore, the primary side coolant passages 37, 38 on the side of the tool table 11 are elongated in the grooves 39a, 40a on the side of the tool table 11, and the secondary refrigerant passages 41, 42 are respectively disposed at the cutting edge. The grooves 39b, 40b of the mounting members 21, 22 are in communication. Thereby, when the blade attachment members 21, 22 are positionally adjusted in the direction orthogonal to the rotation axis A in the cutter 11, the primary side agent passages 37, 38 can be cooled frequently with the secondary side via the adjustment portion coolant passages 39, 40. The agent passages 41, 42 are in communication. When the workpiece 2 is processed, there is a difference in the position of the blade attachment members 21 and 22 in the line direction. First, the inner surface of the drill hole 2a is cut by the front side cutting edge 23, and then the cutting process is performed by the rear side cutting edge 24. At the beginning of the cutting process, the coolant is sprayed from the injection ports 34, 35 toward the blade edge 24 on the rear side of the front blade 23. Therefore, in the front side cutting edge and the rear side cutting edge 24, the blades 23c and 24c which are in contact with the workpiece 2 are particularly cooled, and the cutting edges 23a are simultaneously formed in the drilled portion 2a of the workpiece 2. , 24c cutting position cooling. The front side cutting edge 23 performs rough cutting because of its large tip radius. The feed speed of the shaft 1 is set at the feed speed according to the cutting of the rear side cutting edge 24, and the cutting portion of the front side cutting edge 23 is subjected to rough cutting in parallel by the rotation of the boring head 20. Further, after the front side cutting edge is subjected to the five rotation amount, the rear side cutting edge 24 cuts the front side cutting edge to perform the cutting process. The end radius of the cutting edge 24c of the rear side cutting edge 24 is half the radius of the tip end of the front side cutting edge 23, so that finer cutting is performed. As a result, when the drilled portion 2a of the workpiece 2 is drilled, the recessed shaft is cold-cut and the tip is 23, and the tip is formed. 23 23 Tips can be -20-200936278 The surface can be extremely precision-finished. In the above-described embodiment, the abutting surface of the distal end surface of the stent shaft 10 and the bottom surface of the main body portion 14 of the blade j is formed into a planar shape, and is pressed by the action of the wire 16 to be fixed so as not to rotate relative thereto. Mechanism of relative rotation. That is, as shown in FIGS. 12 and 13, the end surface 210a of the holder and the bottom surface 214a extending from the main body portion 214 of the tool holder 211 toward the lower insertion portion 215 may be formed with uneven portions such that the end surface 210a of the 210 and the cutter table When the bottom i of the main body portion 214 of 211 comes into contact with each other, the uneven portions are engaged. For example, a protrusion 220 is formed on the surface 214a of the tool holder 211, and a concave portion 221 corresponding to the protrusion 220 is formed on the front end 210a of the holder shaft 210. Thereby, the insertion portion 215 of the 211 is fitted into the state in which the insertion of the holder shaft 210 is fitted, and the protrusion 220 is engaged with the concave portion 221, whereby the tool can be accurately adjusted in direction with respect to the holder shaft 210. When the holder shaft 211 is coupled to the tool holder 211, the end surface 210a of the abutting surface and the concave portion 221 of the bottom surface 214a are engaged with each other, and the tool holder 211 is firmly fixed to the insertion portion from the connection insertion. The direction of 215 moves outside the recess 221 and the ribs 220. Further, since the fixing of the cutter table 211 of the locking screw is good, the overall stability from the bracket to the blade edge can be remarkably improved during the machining. I: table 11 locking screw can have shaft 210 extending bracket shaft g 2 14a side bottom end tool table portion 213 table 211 in the strip 220 portion 213 extension direction bracket shaft 210 - 21 - 200936278 [simple figure [First Embodiment] Fig. 1 is an explanatory view showing an overall configuration of a cutting apparatus according to a first embodiment of the present invention. Fig. 2 is a front view showing a combined state of a bracket shaft and a cutter table. Fig. 3 is an enlarged front elevational view showing a main portion of a state in which the cutter table is attached to the state before the bracket shaft is coupled. Figure 4 is a right side view of Figure 3. Fig. 5 is an enlarged cross-sectional view showing the main part of a state in which the tool holder is coupled to the holder shaft. Fig. 6 is a view similar to Fig. 3 of the second embodiment of the present invention. Figure 7 is a front view of the hoe. Figure 8 is a top view of Figure 7. Fig. 9 is a view showing the pedestal portion of Fig. 7 separated from the tool mounting portion. Fig. 1 is a view showing a state in which the pedestal portion of Fig. 7 is separated from the tool mounting portion. Fig. 11 is an enlarged view of a main portion using two types of cutting tools. Fig. 1 is a cross-sectional view showing another configuration example of the lock screw. Fig. 13 is an end elevational view showing the distal end side of the stent shaft according to the second embodiment of the present invention. [Explanation of main component symbols] 1 : Spindle 2 : Machined object -22- 200936278 2a : Drilling section 3 : Cutting tool set 4 : Working table 10 : Bracket shaft 1 0 a · Cylindrical part l〇b : Conical part 11 - tool holder 1 2 : spindle coupling portion 13 : coupling fitting portion 14 : main body portion 1 5 · insertion portion 1 6 : locking screw 1 6 a . inclined portion 1 7 : screw hole 18 : locking recess 1 8 a : receiving surface 2 〇: boring head 21, 22: blade mounting members 21a, 22a: projections 23, 24: blade 23a: transverse blade 23b: front blade 23c: blade tip 24a: transverse blade -23 200936278 24b: front blade 24c : Tool nose 2 5 : Positioning part 2 6 , 2 7 : Screw hole 2 8 , 2 9 : Locking screw 3 0, 3 1 : Long hole 3 2, 3 3 : Blade fixing part 3 4, 3 5 : Injection port 36a, 36b: coolant supply passages 3 7 , 3 8 : - secondary coolant passages 39 , 40 : adjustment portion coolant passages 39 a , 39 b , 40 a , 40 b : grooves 41 , 42 : secondary side coolant passage 1 1 6 : Locking screw 116a: Spherical bearing part 1 1 6b : Steel ball 21 0 : Bracket shaft 2 1 0 a : End surface 21 1 : Tool table 2 1 4 : Main body 2 1 4a : Bottom surface 2 1 5 : Insertion part 220: protrusion 22 1 : concave -24- 200936278 F: component R 1, R 2: radius of curvature
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