592856 (1) 玖、發明說明 【發明所屬之技術】 本發明係關於鋼管端面加工裝置’特別是有關由工場製造 並將被切斷的鋼管製成預定的長度用的鋼管端面加工裝置 【先前技術】 藉由第9圖說明鋼管端面加工裝置的整體。1是被加 工的鋼管，2是將鋼管1朝與紙面呈垂直方向地朝橫方向 依序搬運的支撐區域，3是在支撐區域2內由朝左右自由 旋轉的複數的鋼管支撐滾子列所組成且卡合在鋼管1並使 移動地被驅動的鋼管壓入及拉出用的定位滾子，4是設在 定位滾子3的右端的鋼管端面加工裝置。另在定位滾子3 的左端也設置與鋼管端面加工裝置4相同的結構。 鋼管端面加工裝置4，是由：面對支撐於區域2的鋼 管挾持裝置6、設成可動地與鋼管1的端部接觸的停止器 7、與鋼管1的端部相面對的端面加工機8所構成。 且，在挾持裝置6中，設有從鋼管1的端部附近由管 軸方向的前後2處挾持的2個的挾持塊4 4。 此各挾持塊44，以往，如第1 0圖、第1 1圖所示， 係在架台40上的固定位置由齒條42部與可自由旋轉的齒 輪41卡合並藉由驅動用缸筒45可在架台40上進行相對 移動地固定裝設於支撐台4 3的相對面上，且各挾持塊44 分別具備2個的凹圓形挾持面，且使4個的凹圓形挾持面 (2) 的4點與鋼管1接觸。 鋼管1的端面加工，是使鋼管1由定位滾子3朝端面 加工裝置4側壓入，並在與停止器7接觸的位置由挾持塊 4 4挾持鋼管1的管軸方向的前後2處。 停止器7從鋼管1朝側部遠離，使端面加工機8前進 並將鋼管1的端部切削加工成預定的開口及平面形狀之後 後退，再將挾持塊4 4放開，接著由將鋼管1藉由定位滾 子3朝支撐區域2側拉回的方法使鋼管的兩端依序地加工 成預定的長度。 但是，此端面加工裝置4的鋼管1的兩端的切削加工 中，振動經常地發生，而產生製品的加工不良。而且此原 因，已知是由挾持塊44及鋼管1的接觸不良所引起的。 即，鋼管1雖看似正圓且正直，但實際上多是非正圓且非 正直的情況，特別是無接縫鋼管其變形量大。 因此推測是由鋼管1的剖面變形或曲折而產生鋼管1 及挾持塊44的接觸不良，而利用感壓紙檢查其接觸狀態 。第1 2圖是使用感壓紙測量鋼管1及挾持塊44的接觸狀 態的情況的一例。 第1 2圖中係顯示將挾持塊44的鋼管挾持狀態的支撐 區域2的入口側作爲左側面，將出口側作爲右側面地朝左 右展開的圖，且將由感壓紙檢測的接觸部以斜線記號46 表示。此情況爲了測量鋼管1的端部的直徑及變形及曲折 而使4個挾持塊4 4之中的對角位置的2個的挾持塊4 4是 以2點與鋼管1接觸，而其他的2個的挾持塊4 4是不與 -8- (5) (5)592856 筒進退驅動的2段驅動方式的結構，而當將鋼管以V字 型挾持塊拘束時，就可以首先由定行程油壓缸筒所移動的 V字型挾持塊成爲與鋼管2點接觸狀態，接著，由各V字 型挾持塊的V形錐面將被2點接觸的鋼管以短行程油壓 缸筒確實地固定。且，藉由此2段驅動方式，即使鋼管的 直徑與預定値不同，或是鋼管變形或彎曲，也可以確實地 挾持。 且，爲了解決上述課題，本發明的鋼管端面加工裝置 ，如上述的鋼管端面加工裝置，其中，在前述鋼管挾持裝 置的各油壓缸筒的油壓控制系統設有嚮導逆止閥。 藉由在如此鋼管挾持裝置的各油壓缸筒的油壓控制系 統設有嚮導逆止閥的結構，即使強力的切削力作用在鋼管 ，也可以藉由其嚮導逆止閥，對抗其切削力使鋼管確實地 被保持。 【實施方式】 茲佐以圖面說明本發明之鋼管端面加工裝置。 第1圖中，1 6是此實施例的鋼管端面加工裝置用的 挾持裝置，16a、16b是朝向構成挾持裝置16的管軸方向 的端面加工機8且設在前後2處的夾具單元。其他的構成 要素與第9圖的習知裝置同樣，並以與第9圖相同的符號 表示。以下將1 6 a稱爲前側夾具單元，將1 6b稱爲後側夾 具單元。 第2圖及第3圖中，17是裝設前後2個前側夾具單 -11 - (6) 元1 6 a、後側夾具單元1 6 b用的底架上的外殼。前後2個 前側夾具單元1 6 a、後側夾具單元1 6 b，是具備分別具有 V字形的錐面的二股的V字型挾持塊1 8，使4個的V字 型挾持塊1 8對於鋼管1呈X字狀從直角4方向進退移動 地設在外殼1 7內。 前側夾具單元1 6 a的下側，是在V字型挾持塊1 8之 間挾持中間臂1 9 a及所需的定行程油壓缸筒2 0而連接螺 旋千斤頂22的結構。後側夾具單元丨6b的下側，是將V 字型挾持塊1 8挾持中間臂1 9 a及所需的定行程油壓缸筒 2〇及調整用的短行程油壓缸筒21而與螺旋千斤頂22連 接的結構。 然而，前側夾具單元1 6 a的上側及後側夾具單元1 6 b 的上側，是挾持中間臂1 9 b而使V字型挾持塊1 8與長行 程油壓缸筒2 3直列連接。且，前側夾具單元1 6 a及後側 夾具單兀16b，可以交換配置而將前後相反地設置。 第4圖〜第6圖中，各V字型挾持塊18分別構成二 股，並將其二股先端部形成於V字形的錐面且將下面形 成圓弧面，V字型挾持塊1 8，將此下面的圓弧面與中間 臂19的先端安裝部24上的圓弧面導引25連接，並以擺 動螺絲2 6及螺帽2 7可沿著圓弧面移動自如地與圓弧面導 引2 5側結合，而裝設成附擺頭機構的結構。且，第6圖 中，在圓弧面導引25的中間凹部，內藏有將與各v字型 挾持塊1 8的下部內面離接卡合的4個的小型的挾持塊固 定用油壓缸筒2 8，而使V字型挾持塊1 8可以固定在已橫 -12- (7) 向滑行後的位置。 且，如第5圖，直角4方向的相鄰接的各V字型挾 持塊1 8，是藉由以二股部配置成避免相互地干渉，而使 即使在小徑的鋼管1的情況，也可以使V字型挾持塊1 8 不會相互干渉地挾持。然而，此V字型挾持塊1 8的結構 是使用日本特開平7- 1 6423 7等所示的公知的結構。 第7圖中，V字型挾持塊1 8進退驅動用的定行程油 壓缸筒20、調整用的短行程油壓缸筒2 1、長行程油壓缸 筒23、挾持塊固定用油壓缸筒28、停止器7用的停止器 操作用油壓缸筒29，是分別通過電磁閥30a、30b、30c、 3 0d、3 0e而與在油壓源及槽筒的管路連接，且在電磁閥 30a、 30b、 30c、 30d、 30e 及各缸筒 20、 21、 23、 28、 29 之間的管路是分別設有流量控制閥3 1及嚮導逆止閥3 2。 具有以上結構的本實施形態的鋼管端面加工裝置，前 側夾具單元1 6a及後側夾具單元1 6b的各油壓缸筒20、 2 1、2 3、2 8、2 9是由第 7圖的控制系統的電磁閥3 0 a〜 3 0e的切換及流量控制閥3 1的操作所控制。螺旋千斤頂 22，是預先藉由鋼管1的直徑而被定位在預定的行程。藉 由停止器7的停止器操作用油壓缸筒29的操作將停止器 7朝端面加工機8前的鋼管進入位置送出的狀態下’藉由 定位滾子3的驅動將鋼管1朝端面加工機8側壓入，並停 止在與停止器7接觸的位置。 接著，將鋼管1的管軸方向的端部2處，由前側夾具 單元1 6a及後側夾具單元1 6b挾持。即，首先延伸前側夾 -13- (8) 具單元1 6a及後側夾具單元1 6b的下側的定行程油壓缸筒 2 0並上昇下側的V字型挾持塊1 8。接著，延伸前側夾具 單元1 6a的上側的長行程油壓缸筒23，並下降位在前側 上的V字型挾持塊1 8。 這時，前側夾具單元1 6a，是利用由定行程油壓缸筒 20及螺旋千斤頂22所產生的壓上力及由長行程油壓缸筒 23所產生的壓下力而以4個的V字型挾持塊1 8的V形錐 面將鋼管1挾入。當因鋼管1的正圓度或正直度的不良而 使V形錐面只與鋼管1單點接觸時，使V字型挾持塊1 8 朝橫方向被按壓並沿著圓弧面導引2 5擺頭式地滑行，並 以此作用使4個的V字型挾持塊1 8的V形錐面全部成爲 與鋼管1的面成爲2點接觸的狀態。 接著，由後側夾具單元1 6b上側的長行程油壓缸筒 2 3的延伸驅動下降上側的V字型挾持塊1 8，再由下側的 短行程油壓缸筒2 1的延伸驅動上昇下側的v字型挾持塊 1 8。此操作下，只要使下側2個的V字型挾持塊1 8多壓 出調整用的短行程油壓缸筒2 1的行程部分並將鋼管由上 側2個及下側2個的V字型挾持塊1 8的v形錐面強力挾 持，當單點接觸的情況時使V字型挾持塊1 8沿著圓弧面 導引2 5呈擺頭式地滑行，在此作用下，使4個的v字型 挾持塊1 8全部以V形錐面與管1的面成爲2點接觸的狀 態。 而且’這時前側·後側各4個的V字型挾持塊1 8， 無關鋼管1的變形·彎曲而可由V形錐面確實地與鋼管1 -14- (9) 的面成爲2點接觸的狀態。在此狀態下’藉由延伸驅動內 藏於圓弧面導引2 5的挾持塊固定用油壓缸筒2 8來維持鋼 管1的挾持狀態。且在此狀態下開始切削的話’即使大的 切削力作用在V字型挾持塊1 8 ’也可以藉由第7圖的控 制系統的嚮導逆止閥3 2對抗切削力’而使鋼管確實地被 保持。 由停止器操作用油壓缸筒2 9的縮短驅動使停止器7 朝旁邊位置後退後，使端面加工機8前進，將鋼管1端部 切削成預定的開口及平面等的形狀後，朝原來位置後退， 將前側夾具單元1 6a及後側夾具單元1 6b張開，並以定位 滾子3的逆驅動將鋼管1從挾持裝置1 6拉出，再將鋼管 1朝出側依序送出後，再度返覆同樣的端面加工。 然而，前側夾具單元16a、後側夾具單元1 6b的上側 的長行程油壓缸筒23，是藉由使用檢測器將挾持及非挾 持之間的行程縮小地控制，而使4個的V字型挾持塊1 8 與鋼管1接觸的時間差減少而可以容易地挾持鋼管1。 第8圖是顯示由前側夾具單元丨6a、後側夾具單元 1 6b挾持有變形或彎曲的一般的鋼管1，並使用感壓紙測 量其挾持狀態的一例，將被測量的V字型挾持塊1 8及鋼 管1的接觸部3 6以斜線記號表示。如第8圖所示，無關 鋼管1的變形或彎曲，使面對直角方向的8個V字型挾 持塊1 8的1 6個的V形錐面由接觸部3 6分別與鋼管i接 觸而可以確實地挾持鋼管1。 藉由將此結構的挾持裝置組裝在鋼管的端面加工裝置 -15- (10) (10)592856 ，而可以獲得以下的效果。 即使鋼管尺寸變化，也不需要交換V字型挾持塊1 8 。且’藉由使各V字型挾持塊1 8的擺頭機構、後側夾具 單元1 6b的V字型挾持塊1 8由直列2段配置的缸筒所驅 動的機構，而即使鋼管的直徑與預定値不同，且即使有變 形或彎曲的鋼管情況，也可以將管軸方向的前後2處以合 計1 6點確實地挾持，即使強力地切削也不會發生振動。 藉由在管軸方向的前後2處的夾具單元16a、16b的 驅動用油壓系設置嚮導逆止閥3 2，就可以確實地保持挾 持力，即使在切削中大的切削力作用在鋼管也不會發生振 動。此結果，可以獲得平坦的切削面，減少製品不良率， 大幅地改善鋼管端面加工裝置的運轉率。 [發明的效果] 本發明的鋼管端面加工裝置，由鋼管製造線製造並將 被切斷的鋼管製成預定的長度用的鋼管端面加工裝置，其 特徵爲：設在前述加工裝置的鋼管端面加工機的前段的鋼 管夾具裝置，係具備由管軸方向的前後2處從直角4方向 朝向鋼管進退驅動的附擺頭機構的V字型挾持塊。 依據具有以上的結構的本發明的鋼管端面加工裝置’ 鋼管挾持裝置，因爲形成使附擺頭機構的V字型挾持塊 從直角4方向朝向鋼管進退驅動的結構，所以4個V字 型挾持塊各是無關鋼管的變形或彎曲’而可與鋼管確實地 以V字型錐面2點接觸。在此狀態下由4個V字型挾持 -16- (12) (12)592856 挾持。 且’本發明的鋼管端面加工裝置，如上述的鋼管端面 加工裝置，其中，在前述鋼管挾持裝置的各油壓缸筒的油 壓控制系統設有嚮導逆止閥。 藉由在如此鋼管挾持裝置的各油壓缸筒的油壓控制系 統設有嚮導逆止閥的結構，即使強力的切削力作用在鋼管 ’也可以藉由其嚮導逆止閥，對抗其切削力使鋼管確實地 被保持。 【圖式簡單說明】 [第1圖]本發明的實施例的鋼管端面加工裝置的整體 側面圖。 [第2圖]第1圖的π - Π線視圖。 [第3圖]第2圖的m - ΠΙ線視圖。 [第4圖]第2圖的IV部的擴大說明圖。 [第5圖]第4圖的V-V線視圖。 [第6圖]第5圖的VI - VI線視圖。 [第7圖]第1圖〜第3圖及第6圖所示的裝置的油壓 管路圖。 [第8圖]使用感壓紙測量本發明的實施例之裝置的挾 持鋼管時的挾持狀態之展開圖。 [第9圖]鋼管端面加工裝置的整體側面圖。 [第1 〇圖]第9圖的X-X線視圖。 [第11圖]第10圖的平面圖。 -18- (13) (13)592856 [第1 2圖]使用感壓紙測量習知裝置的挾持鋼管時的 挾持狀態之展開圖。 [圖號說明] 1 鋼管 2 支撐區域 3 定位滾子 4 鋼管端面加工裝置 7 停止器 8 端面加工機 16 挾持裝置 16a 前側夾具單元 16b 後側夾具單元 17 外殻 18 V字型夾具工具 19a 中間懸桿 19b 中間懸桿 20 定行程油壓缸筒 2 1 短行程油壓缸筒 22 螺旋千斤頂 23 長行程油壓缸筒 24 先端安裝部 25 圓弧面導引 26 擺動螺絲 -19- (14)592856 2 7 螺帽 28 挾持塊固定用油壓缸筒 2 9 停止器操作用油壓缸筒592856 (1) 发明 Description of the invention [Technology to which the invention belongs] The present invention relates to a steel tube end surface processing device 'especially to a steel tube end surface processing device which is manufactured by a factory and cuts a steel tube to a predetermined length [prior art] The whole of the steel pipe end surface processing apparatus is demonstrated using FIG. 1 is a processed steel pipe, 2 is a support area where the steel pipe 1 is transported in a horizontal direction in a direction perpendicular to the paper surface, and 3 is a plurality of steel pipe support roller rows which are freely rotated in the support area 2 in the left and right directions. A positioning roller for press-in and pull-out of a steel pipe that is composed and engaged with the steel pipe 1 and is driven to move, is a steel pipe end surface processing device provided at the right end of the positioning roller 3. The left end of the positioning roller 3 is also provided with the same structure as the steel pipe end surface processing device 4. The steel pipe end surface processing device 4 is composed of a steel pipe holding device 6 supported on the area 2, a stopper 7 provided to move in contact with the end of the steel pipe 1, and an end processing machine facing the end of the steel pipe 1. 8 composition. In addition, the holding device 6 is provided with two holding blocks 4 4 which are held at two positions in the pipe axis direction from the vicinity of the end portion of the steel pipe 1. As shown in FIG. 10 and FIG. 11, each of the holding blocks 44 has been fixed to the stand 40 by a rack 42 and a freely rotatable gear 41. It can be fixedly installed on the opposite surface of the support table 43 in a relative movement on the stand 40, and each holding block 44 is provided with two concave circular holding surfaces, and four concave circular holding surfaces (2 4) contact the steel pipe 1. The end surface processing of the steel pipe 1 is to press the steel pipe 1 toward the end surface processing device 4 by the positioning rollers 3, and to hold the steel pipe 1 at the front and rear directions of the pipe axis 1 by the holding blocks 4 and 4 at the positions in contact with the stopper 7. The stopper 7 moves away from the steel pipe 1 to the side, advances the end surface processing machine 8 and cuts the end of the steel pipe 1 into a predetermined opening and a flat shape, and then moves back. Then, the holding block 4 4 is released, and then the steel pipe 1 is released. Both ends of the steel pipe are sequentially processed to a predetermined length by a method in which the positioning roller 3 is pulled back toward the support area 2 side. However, in the cutting processing of the both ends of the steel pipe 1 of this end surface processing device 4, vibrations often occur, resulting in processing defects of the product. The cause is known to be caused by poor contact between the holding block 44 and the steel pipe 1. That is, although the steel pipe 1 seems to be perfectly round and straight, it is often a case of being non-round and non-straight, and particularly the seamless steel pipe has a large amount of deformation. Therefore, it is presumed that the contact failure between the steel pipe 1 and the holding block 44 is caused by the deformation or tortuosity of the cross section of the steel pipe 1, and the contact state of the steel pipe 1 and the holding block 44 is checked with a pressure sensitive paper. Fig. 12 is an example of a case where the contact state of the steel pipe 1 and the holding block 44 is measured using a pressure sensitive paper. Figures 12 and 12 show the left side of the support side 2 of the steel tube holding state of the holding block 44 as the left side, and the right side of the outlet side as the left side, and the contact portion detected by the pressure sensitive paper is slanted. The symbol 46 indicates it. In this case, in order to measure the diameter and deformation and tortuosity of the end portion of the steel pipe 1, two of the four retaining blocks 4 4 at diagonal positions are in contact with the steel pipe 1 at two points, and the other two Each holding block 4 4 is a two-stage drive structure that does not correspond to the -8- (5) (5) 592856 tube forward and backward driving. When the steel pipe is bound by a V-shaped holding block, the fixed stroke oil can be used first. The V-shaped clamping block moved by the cylinder is brought into contact with the steel pipe at two points, and then the V-shaped tapered surface of each V-shaped clamping block securely fixes the steel pipe contacted by the two points with a short-stroke hydraulic cylinder. . In addition, with this two-stage driving method, even if the diameter of the steel pipe is different from the predetermined diameter, or if the steel pipe is deformed or bent, it can be reliably held. In addition, in order to solve the above-mentioned problems, the steel pipe end surface processing device of the present invention is the same as the steel pipe end surface processing device described above, wherein the hydraulic control system of each hydraulic cylinder of the steel pipe holding device is provided with a guide check valve. By providing a guide check valve in the hydraulic control system of each hydraulic cylinder of such a steel pipe holding device, even if a strong cutting force acts on the steel pipe, the guide check valve can be used to counteract the cutting force. Keep the steel pipe securely. [Embodiment] The following describes a steel pipe end surface processing apparatus according to the present invention with reference to the drawings. In the first figure, 16 is a holding device for a steel tube end surface processing device of this embodiment, and 16a and 16b are jig units provided at the front and rear end processing machines 8 constituting the tube axis direction of the holding device 16 and provided at the front and back. The other components are the same as those of the conventional device shown in FIG. 9 and are denoted by the same reference numerals as those in FIG. 9. Hereinafter, 16 a is referred to as a front-side clamp unit, and 16 b is referred to as a rear-side clamp unit. In Fig. 2 and Fig. 3, 17 is a housing on the chassis for mounting two front-side clamp units -11-(6) 16a and 16b. The two front and rear clamp units 16 a and 16 b are two V-shaped holding blocks 18 each having a V-shaped tapered surface, and four V-shaped holding blocks 18 The steel pipe 1 is provided in the casing 17 in an X shape and moves forward and backward from the right angle 4 direction. The lower side of the front-side clamp unit 16 a is a structure that holds the intermediate arm 19 a and the required fixed-stroke hydraulic cylinder 20 between the V-shaped gripping blocks 18 to connect the screw jack 22. On the lower side of the rear side clamp unit 6b, the V-shaped clamping block 1 8 holds the middle arm 19 a and the required fixed-stroke hydraulic cylinder 20 and the short-stroke hydraulic cylinder 21 for adjustment. The screw jack 22 is connected to the structure. However, the upper side of the front side clamp unit 16a and the upper side of the rear side clamp unit 16b are holding the middle arm 19b to connect the V-shaped holding block 18 to the long-distance hydraulic cylinder 23 in an in-line manner. In addition, the front-side clamp unit 16a and the rear-side clamp unit 16b can be arranged in opposite directions by exchanging the arrangement. In FIGS. 4 to 6, each V-shaped holding block 18 is formed into two strands, and its two-stroke tip is formed on a V-shaped tapered surface and an arc surface is formed below, and the V-shaped holding block 18 is formed. The lower arc surface is connected to the arc surface guide 25 on the front end mounting portion 24 of the middle arm 19, and can be freely moved along the arc surface by swinging the screw 26 and the nut 27. The lead is combined with 5 sides, and it is installed as a structure with a swing head mechanism. Further, in FIG. 6, the middle recessed portion of the arc surface guide 25 contains four small holding block fixing oils for engaging and disengaging the lower inner surface of each of the v-shaped holding blocks 18. Press the cylinder tube 2 8 so that the V-shaped gripping block 1 8 can be fixed in the position where it has slid -12- (7) to the side. In addition, as shown in FIG. 5, the adjacent V-shaped holding blocks 18 in the right-angle 4 direction are arranged in two strands so as to avoid mutual drying, so that even in the case of the small-diameter steel pipe 1, It is possible to prevent the V-shaped holding blocks 1 8 from holding each other dry. However, the structure of this V-shaped holding block 18 is a known structure shown in Japanese Patent Application Laid-Open No. 7-1 6423 7 and the like. In Figure 7, the V-shaped holding block 18 is a fixed-stroke hydraulic cylinder 20 for forward and backward driving, a short-stroke hydraulic cylinder 2 for adjustment 1, a long-stroke hydraulic cylinder 23, and a hydraulic pressure for fixing the holding block. The cylinder barrel 28 and the stopper-operating hydraulic cylinder barrel 29 for the stopper 7 are connected to the pipelines at the hydraulic pressure source and the tank through solenoid valves 30a, 30b, 30c, 3d, and 3e, respectively, and The pipelines between the solenoid valves 30a, 30b, 30c, 30d, and 30e and the cylinders 20, 21, 23, 28, and 29 are respectively provided with a flow control valve 31 and a guide check valve 32. The steel tube end surface processing device of the present embodiment having the above structure, each of the hydraulic cylinder barrels 20, 2 1, 2 3, 2 8, 2 and 9 of the front clamp unit 16a and the rear clamp unit 16b is shown in FIG. 7 The switching of the solenoid valves 30 a to 30 e of the control system and the operation of the flow control valve 31 are controlled. The screw jack 22 is positioned at a predetermined stroke by the diameter of the steel pipe 1 in advance. When the stopper 7 is operated by the hydraulic cylinder 29 of the stopper operation, the stopper 7 is sent out to the steel pipe entering position in front of the end processing machine 8, and the steel pipe 1 is processed toward the end surface by the drive of the positioning roller 3. The machine 8 is pressed in and stopped at a position in contact with the stopper 7. Next, two end portions in the tube axis direction of the steel pipe 1 are held by the front-side clamp unit 16a and the rear-side clamp unit 16b. That is, first extend the front clamp -13- (8) the fixed stroke hydraulic cylinder 20 of the lower side of the fixture unit 16a and the rear clamp unit 16b and raise the lower V-shaped holding block 18. Next, the upper long stroke hydraulic cylinder 23 of the front side clamp unit 16a is extended, and the V-shaped holding block 18 positioned on the front side is lowered. At this time, the front-side clamp unit 16a is formed by four V-shapes using the pressing force generated by the fixed-stroke hydraulic cylinder 20 and the screw jack 22 and the pressing force generated by the long-stroke hydraulic cylinder 23. The V-shaped tapered surface of the shape holding block 18 pushes the steel pipe 1 into it. When the V-shaped conical surface makes only one point contact with the steel pipe 1 due to the poor roundness or straightness of the steel pipe 1, the V-shaped holding block 1 8 is pressed in the lateral direction and guided along the arc surface 2 The five-head swivel slides, and the V-shaped conical surfaces of the four V-shaped gripping blocks 18 are all brought into contact with the surface of the steel pipe 2 at two points by this action. Next, the V-shaped holding block 18 on the upper side is lowered by the extended driving of the long-stroke hydraulic cylinder barrel 23 on the upper side of the rear clamp unit 16b, and it is raised by the extended driving of the short-stroke hydraulic cylinder barrel 21 on the lower side. The v-shaped holding block 1 8 on the lower side. In this operation, as long as the lower two V-shaped clamping blocks 18 are pressed out, the stroke portion of the short-stroke hydraulic cylinder 21 for adjustment is adjusted, and the steel pipe is changed from the upper two and the lower two V-shaped. The V-shaped conical surface of the type holding block 18 is strongly held. When a single point of contact is made, the V-shaped holding block 18 is guided along the arc surface to slide in a swinging manner. Under this effect, the The four V-shaped gripping blocks 18 are all in a state where the V-shaped tapered surface and the surface of the tube 1 are in two-point contact. And 'At this time, four V-shaped holding blocks 18 on each of the front side and the rear side, regardless of the deformation and bending of the steel pipe 1, can be reliably made by the V-shaped tapered surface and the surface of the steel pipe 1 -14- (9) at two points status. In this state, the holding state of the steel pipe 1 is maintained by extending the driving of the hydraulic cylinder tube 28 for holding the holding block, which is embedded in the arc surface guide 25. When cutting is started in this state, 'Even if a large cutting force acts on the V-shaped holding block 1 8', the steel pipe can be reliably made by the guide check valve 3 2 of the control system of FIG. 7 against the cutting force '. be kept. By the shortening driving of the hydraulic cylinder 29 for the stopper operation, the stopper 7 is moved back to the side position, the end processing machine 8 is advanced, and the end of the steel pipe 1 is cut into a predetermined shape such as a predetermined opening and a flat surface, and then the original Position backwards, open the front clamp unit 16a and the rear clamp unit 16b, and pull the steel pipe 1 out of the holding device 16 by the reverse driving of the positioning roller 3, and then send the steel pipe 1 to the exit side in order. , And repeat the same end processing. However, the long stroke hydraulic cylinder 23 on the upper side of the front clamp unit 16a and the rear clamp unit 16b is controlled by using a detector to reduce the stroke between the clamped and non-clamped, so that four V-shaped The time difference between the contact of the shape holding block 18 with the steel pipe 1 is reduced, and the steel pipe 1 can be easily held. Fig. 8 shows an example of a deformed or bent ordinary steel pipe 1 held by the front side clamp unit 6a and the rear side clamp unit 16b, and its holding state is measured using pressure sensitive paper. The measured V-shaped holding block 18 and the contact portion 36 of the steel pipe 1 are indicated by oblique lines. As shown in FIG. 8, regardless of the deformation or bending of the steel pipe 1, the 16 V-shaped tapered surfaces facing the eight V-shaped holding blocks 18 in the right-angle direction are contacted by the contact portions 36 with the steel pipe i, respectively. The steel pipe 1 can be reliably held. The following effects can be obtained by assembling the holding device of this structure to an end surface processing device of a steel pipe -15- (10) (10) 592856. Even if the size of the steel pipe changes, there is no need to exchange the V-shaped holding block 1 8. And 'the mechanism of driving the V-shaped holding block 18 of each V-shaped holding block 18 and the V-shaped holding block 18 of the rear-side clamp unit 16b by the cylinders arranged in two rows, even if the diameter of the steel pipe Different from the predetermined 値, and even in the case of a deformed or bent steel pipe, it is possible to securely hold the front and back 2 points in the pipe axis direction at a total of 16 points, and no vibration will occur even when cutting strongly. By setting the guide check valve 32 at the driving hydraulic system of the clamp units 16a and 16b at the front and back positions in the pipe axis direction, the holding force can be reliably maintained, even if a large cutting force acts on the steel pipe during cutting. No vibration will occur. As a result, a flat cutting surface can be obtained, a product defect rate can be reduced, and the operating rate of a steel pipe end surface processing apparatus can be significantly improved. [Effects of the Invention] The steel pipe end surface processing device of the present invention is a steel pipe end surface processing device manufactured by a steel pipe manufacturing line and used to cut a steel pipe into a predetermined length, and is characterized in that: The steel pipe clamp device at the front of the machine is a V-shaped holding block with a swing head mechanism that is driven forward and backward from the right angle 4 to the steel pipe at two forward and backward positions in the pipe axis direction. According to the steel pipe end surface processing device of the present invention having the above structure, the steel pipe holding device is configured to drive the V-shaped holding block with a swing head mechanism to move forward and backward from the right angle to the steel tube, so four V-shaped holding blocks Each of them can be reliably contacted with the steel pipe with a V-shaped tapered surface at two points regardless of the deformation or bending of the steel pipe. In this state, it is held by 4 V-shaped -16- (12) (12) 592856. Further, the steel pipe end surface processing device of the present invention is the same as the above-mentioned steel pipe end surface processing device, wherein the hydraulic control system of each hydraulic cylinder of the steel pipe holding device is provided with a guide check valve. With such a structure that a guide check valve is provided in the hydraulic control system of each hydraulic cylinder of the steel pipe holding device, even if a strong cutting force acts on the steel pipe, the guide check valve can be used to counteract the cutting force. Keep the steel pipe securely. [Brief Description of the Drawings] [Fig. 1] An overall side view of a steel pipe end surface processing apparatus according to an embodiment of the present invention. [Fig. 2] π-Π line view of Fig. 1. [Figure 3] View of the m-III line in Figure 2. [Fig. 4] An enlarged explanatory view of part IV in Fig. 2. [Fig. 5] A view taken along the line V-V in Fig. 4. [Fig. 6] VI-VI view of Fig. 5. [Fig. 7] Hydraulic circuit diagrams of the devices shown in Figs. 1 to 3 and 6. [Fig. 8] An expanded view of the state of holding when the steel pipe is held by the apparatus according to the embodiment of the present invention using pressure sensitive paper. [Fig. 9] An overall side view of a steel pipe end surface processing device. [Fig. 10] An X-X line view of Fig. 9. [FIG. 11] A plan view of FIG. 10. -18- (13) (13) 592856 [Fig. 12] An expanded view of the state of holding when measuring the holding steel tube of a conventional device using pressure sensitive paper. [Description of drawing number] 1 Steel tube 2 Supporting area 3 Positioning roller 4 Steel tube end surface processing device 7 Stopper 8 End surface processing machine 16 Holding device 16a Front clamp unit 16b Rear clamp unit 17 Housing 18 V-shaped clamp tool 19a Middle suspension Rod 19b Middle suspension 20 Fixed-stroke hydraulic cylinder 2 1 Short-stroke hydraulic cylinder 22 Screw jack 23 Long-stroke hydraulic cylinder 24 Tip mounting portion 25 Arc surface guide 26 Swing screw-19- (14) 592856 2 7 Nuts 28 Cylinders for fixing the holding block 2 9 Cylinders for stopper operation
3 0a 電磁閥 3〇b 電磁閥 3〇c 電磁閥 3 0 d 電磁閥 3 0 e 電磁閥 3 1 流量控制閥 32 嚮導逆止閥 36 挾持塊及鋼管的接觸處3 0a solenoid valve 3〇b solenoid valve 3〇c solenoid valve 3 0 d solenoid valve 30
-20--20-