版權(quán)說(shuō)明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
1、<p><b> 數(shù)控機(jī)床改造</b></p><p> --國(guó)際設(shè)備工程與管理2005年5月第一卷</p><p> 1數(shù)控系統(tǒng)發(fā)展簡(jiǎn)史及趨勢(shì)</p><p> 1946年誕生了世界上第一臺(tái)電子計(jì)算機(jī),這表明人類創(chuàng)造了可增強(qiáng)和部分代替腦力勞動(dòng)的工具。它與人類在農(nóng)業(yè)、工業(yè)社會(huì)中創(chuàng)造的那些只是增強(qiáng)體力勞動(dòng)的工具相比,起了質(zhì)的飛躍
2、,為人類進(jìn)入信息社會(huì)奠定了基礎(chǔ)。</p><p> 6年后,即在1952年,計(jì)算機(jī)技術(shù)應(yīng)用到了機(jī)床上,在美國(guó)誕生了第一臺(tái)數(shù)控機(jī)床。從此,傳統(tǒng)機(jī)床產(chǎn)生了質(zhì)的變化。近半個(gè)世紀(jì)以來(lái),數(shù)控系統(tǒng)經(jīng)歷了兩個(gè)階段和六代的發(fā)展。</p><p> 1.1數(shù)控(NC)階段(1952~1970年) </p><p> 早期計(jì)算機(jī)的運(yùn)算速度低,對(duì)當(dāng)時(shí)的科學(xué)計(jì)算和數(shù)據(jù)處理影響還不大,
3、但不能適應(yīng)機(jī)床實(shí)時(shí)控制的要求。人們不得不采用數(shù)字邏輯電路"搭"成一臺(tái)機(jī)床專用計(jì)算機(jī)作為數(shù)控系統(tǒng),被稱為硬件連接數(shù)控(HARD-WIRED NC),簡(jiǎn)稱為數(shù)控(NC)。隨著元器件的發(fā)展,這個(gè)階段歷經(jīng)了三代,即1952年的第一代--電子管;1959年的第二代--晶體管;1965年的第三代--小規(guī)模集成電路。 </p><p> 1.2計(jì)算機(jī)數(shù)控(CNC)階段(1970年~現(xiàn)在) </p&g
4、t;<p> 到1970年,通用小型計(jì)算機(jī)業(yè)已出現(xiàn)并成批生產(chǎn)。于是將它移植過(guò)來(lái)作為數(shù)控系統(tǒng)的核心部件,從此進(jìn)入了計(jì)算機(jī)數(shù)控(CNC)階段(把計(jì)算機(jī)前面應(yīng)有的"通用"兩個(gè)字省略了)。到1971年,美國(guó)INTEL公司在世界上第一次將計(jì)算機(jī)的兩個(gè)最核心的部件--運(yùn)算器和控制器,采用大規(guī)模集成電路技術(shù)集成在一塊芯片上,稱之為微處理器(MICROPROCESSOR),又可稱為中央處理單元(簡(jiǎn)稱CPU)。 <
5、;/p><p> 到1974年微處理器被應(yīng)用于數(shù)控系統(tǒng)。這是因?yàn)樾⌒陀?jì)算機(jī)功能太強(qiáng),控制一臺(tái)機(jī)床能力有富裕(故當(dāng)時(shí)曾用于控制多臺(tái)機(jī)床,稱之為群控),不如采用微處理器經(jīng)濟(jì)合理。而且當(dāng)時(shí)的小型機(jī)可靠性也不理想。早期的微處理器速度和功能雖還不夠高,但可以通過(guò)多處理器結(jié)構(gòu)來(lái)解決。由于微處理器是通用計(jì)算機(jī)的核心部件,故仍稱為計(jì)算機(jī)數(shù)控。 </p><p> 到了1990年,PC機(jī)的性能已發(fā)展到很高的
6、階段,可以滿足作為數(shù)控系統(tǒng)核心部件的要求。數(shù)控系統(tǒng)從此進(jìn)入了基于PC的階段。 </p><p> 總之,計(jì)算機(jī)數(shù)控階段也經(jīng)歷了三代。即1970年的第四代--小型計(jì)算機(jī);1974年的第五代--微處理器和1990年的第六代--基于PC(也就是為PC-BASED)。 </p><p> 1.3 數(shù)控未來(lái)發(fā)展的趨勢(shì) </p><p> 1.3.1 繼續(xù)向開(kāi)放式、基于P
7、C的第六代方向發(fā)展 </p><p> 基于PC所具有的開(kāi)放性、低成本、高可靠性、軟硬件資源豐富等特點(diǎn),更多的數(shù)控系統(tǒng)生產(chǎn)廠家會(huì)走上這條道路。至少采用PC機(jī)作為它的前端機(jī),來(lái)處理人機(jī)界面、編程、聯(lián)網(wǎng)通信等問(wèn)題,由原有的系統(tǒng)承擔(dān)數(shù)控的任務(wù)。PC機(jī)所具有的友好的人機(jī)界面,將普及到所有的數(shù)控系統(tǒng)。遠(yuǎn)程通訊,遠(yuǎn)程診斷和維修將更加普遍。 </p><p> 1.3.2 向高速化和高精度化發(fā)展 &
8、lt;/p><p> 這是適應(yīng)機(jī)床向高速和高精度方向發(fā)展的需要。 </p><p> 1.3.3 向智能化方向發(fā)展 </p><p> 隨著人工智能在計(jì)算機(jī)領(lǐng)域的不斷滲透和發(fā)展,數(shù)控系統(tǒng)的智能化程度將不斷提高。 </p><p> ?、賾?yīng)用自適應(yīng)控制技術(shù) </p><p> 數(shù)控系統(tǒng)能檢測(cè)過(guò)程中一些重要信息,并自動(dòng)
9、調(diào)整系統(tǒng)的有關(guān)參數(shù),達(dá)到改進(jìn)系統(tǒng)運(yùn)行狀態(tài)的目的。 </p><p> ?、谝雽<蚁到y(tǒng)指導(dǎo)加工 </p><p> 將熟練工人和專家的經(jīng)驗(yàn),加工的一般規(guī)律和特殊規(guī)律存入系統(tǒng)中,以工藝參數(shù)數(shù)據(jù)庫(kù)為支撐,建立具有人工智能的專家系統(tǒng)。 </p><p> ?、垡牍收显\斷專家系統(tǒng) </p><p> ?、苤悄芑瘮?shù)字伺服驅(qū)動(dòng)裝置 </p>
10、;<p> 可以通過(guò)自動(dòng)識(shí)別負(fù)載,而自動(dòng)調(diào)整參數(shù),使驅(qū)動(dòng)系統(tǒng)獲得最佳的運(yùn)行。 </p><p> 2 機(jī)床數(shù)控化改造的必要性</p><p> 2.1微觀看改造的必要性 </p><p> 從微觀上看,數(shù)控機(jī)床比傳統(tǒng)機(jī)床有以下突出的優(yōu)越性,而且這些優(yōu)越性均來(lái)自數(shù)控系統(tǒng)所包含的計(jì)算機(jī)的威力。 </p><p> 2.1.
11、1 可以加工出傳統(tǒng)機(jī)床加工不出來(lái)的曲線、曲面等復(fù)雜的零件。 </p><p> 由于計(jì)算機(jī)有高超的運(yùn)算能力,可以瞬時(shí)準(zhǔn)確地計(jì)算出每個(gè)坐標(biāo)軸瞬時(shí)應(yīng)該運(yùn)動(dòng)的運(yùn)動(dòng)量,因此可以復(fù)合成復(fù)雜的曲線或曲面。 </p><p> 2.1.2 可以實(shí)現(xiàn)加工的自動(dòng)化,而且是柔性自動(dòng)化,從而效率可比傳統(tǒng)機(jī)床提高3~7倍。 </p><p> 由于計(jì)算機(jī)有記憶和存儲(chǔ)能力,可以將輸入的
12、程序記住和存儲(chǔ)下來(lái),然后按程序規(guī)定的順序自動(dòng)去執(zhí)行,從而實(shí)現(xiàn)自動(dòng)化。數(shù)控機(jī)床只要更換一個(gè)程序,就可實(shí)現(xiàn)另一工件加工的自動(dòng)化,從而使單件和小批生產(chǎn)得以自動(dòng)化,故被稱為實(shí)現(xiàn)了"柔性自動(dòng)化"。 </p><p> 2.1.3 加工零件的精度高,尺寸分散度小,使裝配容易,不再需要"修配"。 </p><p> 2.1.4 可實(shí)現(xiàn)多工序的集中,減少零件 在
13、機(jī)床間的頻繁搬運(yùn)。 </p><p> 2.1.5 擁有自動(dòng)報(bào)警、自動(dòng)監(jiān)控、自動(dòng)補(bǔ)償?shù)榷喾N自律功能,因而可實(shí)現(xiàn)長(zhǎng)時(shí)間無(wú)人看管加工。 </p><p> 2.1.6 由以上五條派生的好處。 </p><p> 如:降低了工人的勞動(dòng)強(qiáng)度,節(jié)省了勞動(dòng)力(一個(gè)人可以看管多臺(tái)機(jī)床),減少了工裝,縮短了新產(chǎn)品試制周期和生產(chǎn)周期,可對(duì)市場(chǎng)需求作出快速反應(yīng)等等。 </p
14、><p> 以上這些優(yōu)越性是前人想象不到的,是一個(gè)極為重大的突破。此外,機(jī)床數(shù)控化還是推行FMC(柔性制造單元)、FMS(柔性制造系統(tǒng))以及CIMS(計(jì)算機(jī)集成制造系統(tǒng))等企業(yè)信息化改造的基礎(chǔ)。數(shù)控技術(shù)已經(jīng)成為制造業(yè)自動(dòng)化的核心技術(shù)和基礎(chǔ)技術(shù)。 </p><p> 2.2宏觀看改造的必要性 </p><p> 從宏觀上看,工業(yè)發(fā)達(dá)國(guó)家的軍、民機(jī)械工業(yè),在70年代末
15、、80年代初已開(kāi)始大規(guī)模應(yīng)用數(shù)控機(jī)床。其本質(zhì)是,采用信息技術(shù)對(duì)傳統(tǒng)產(chǎn)業(yè)(包括軍、民機(jī)械工業(yè))進(jìn)行技術(shù)改造。除在制造過(guò)程中采用數(shù)控機(jī)床、FMC、FMS外,還包括在產(chǎn)品開(kāi)發(fā)中推行CAD、CAE、CAM、虛擬制造以及在生產(chǎn)管理中推行MIS(管理信息系統(tǒng))、CIMS等等。以及在其生產(chǎn)的產(chǎn)品中增加信息技術(shù),包括人工智能等的含量。由于采用信息技術(shù)對(duì)國(guó)外軍、民機(jī)械工業(yè)進(jìn)行深入改造(稱之為信息化),最終使得他們的產(chǎn)品在國(guó)際軍品和民品的市場(chǎng)上競(jìng)爭(zhēng)力大為增
16、強(qiáng)。 </p><p> 3 數(shù)控化改造的內(nèi)容及優(yōu)缺</p><p> 3.1數(shù)控改造業(yè)的興起 </p><p> 在美國(guó)、日本和德國(guó)等國(guó)家,機(jī)床改造作為新的經(jīng)濟(jì)增長(zhǎng)行業(yè),生意盎然,正處在黃金時(shí)代。由于機(jī)床以及技術(shù)的不斷進(jìn)步,機(jī)床改造是個(gè)"永恒"的課題。在美國(guó)、日本、德國(guó),用數(shù)控技術(shù)改造機(jī)床和生產(chǎn)線具有廣闊的市場(chǎng),已形成了機(jī)床和生產(chǎn)線數(shù)控改
17、造的新的行業(yè)。在美國(guó),機(jī)床改造業(yè)稱為機(jī)床再生(Remanufacturing)業(yè)。從事再生業(yè)的著名公司有:Bertsche工程公司、ayton機(jī)床公司、Devlieg-Bullavd(得寶)服務(wù)集團(tuán)、US設(shè)備公司等。。在日本,機(jī)床改造業(yè)稱為機(jī)床改裝(Retrofitting)業(yè)。從事改裝業(yè)的著名公司有:大隈工程集團(tuán)、崗三機(jī)械公司、千代田工機(jī)公司、野崎工程公司、濱田工程公司、山本工程公司等。 </p><p>
18、3.2數(shù)控化改造的內(nèi)容 </p><p> 機(jī)床與生產(chǎn)線的數(shù)控化改造主要內(nèi)容有以下幾點(diǎn): </p><p> 其一是恢復(fù)原功能,對(duì)機(jī)床、生產(chǎn)線存在的故障部分進(jìn)行診斷并恢復(fù); </p><p> 其二是NC化,在普通機(jī)床上加數(shù)顯裝置,或加數(shù)控系統(tǒng),改造成NC機(jī)床、CNC機(jī)床; </p><p> 其三是翻新,為提高精度、效率和自動(dòng)化程度
19、,對(duì)機(jī)械、電氣部分進(jìn)行翻新,對(duì)機(jī)械部分重新裝配加工,恢復(fù)原精度;對(duì)其不滿足生產(chǎn)要求的CNC系統(tǒng)以最新CNC進(jìn)行更新; </p><p> 其四是技術(shù)更新或技術(shù)創(chuàng)新,為提高性能或檔次,或?yàn)榱耸褂眯鹿に?、新技術(shù),在原有基礎(chǔ)上進(jìn)行較大規(guī)模的技術(shù)更新或技術(shù)創(chuàng)新,較大幅度地提高水平和檔次的更新改造。 </p><p> 3.3數(shù)控化改造的優(yōu)缺 </p><p> 3.3
20、.1 減少投資額、交貨期短 </p><p> 同購(gòu)置新機(jī)床相比,一般可以節(jié)省60%~80%的費(fèi)用,改造費(fèi)用低。特別是大型、特殊機(jī)床尤其明顯。一般大型機(jī)床改造,只花新機(jī)床購(gòu)置費(fèi)用的1/3,交貨期短。但有些特殊情況,如高速主軸、托盤(pán)自動(dòng)交換裝置的制作與安裝過(guò)于費(fèi)工、費(fèi)錢,往往改造成本提高2~3倍,與購(gòu)置新機(jī)床相比,只能節(jié)省投資50%左右。 </p><p> 3.3.2 機(jī)械性能穩(wěn)定可靠
21、,結(jié)構(gòu)受限 </p><p> 所利用的床身、立柱等基礎(chǔ)件都是重而堅(jiān)固的鑄造構(gòu)件,而不是那種焊接構(gòu)件,改造后的機(jī)床性能高、質(zhì)量好,可以作為新設(shè)備繼續(xù)使用多年。但是受到原來(lái)機(jī)械結(jié)構(gòu)的限制,不宜做突破性的改造。 </p><p> 3.3.3 熟悉了解設(shè)備、便于操作維修 </p><p> 購(gòu)買新設(shè)備時(shí),不了解新設(shè)備是否能滿足其加工要求。改造則不然,可以精確地計(jì)算
22、出機(jī)床的加工能力;另外,由于多年使用,操作者對(duì)機(jī)床的特性早已了解,在操作使用和維修方面培訓(xùn)時(shí)間短,見(jiàn)效快。改造的機(jī)床一安裝好,就可以實(shí)現(xiàn)全負(fù)荷運(yùn)轉(zhuǎn)。 </p><p> 3.3.4 可充分利用現(xiàn)有的條件 </p><p> 可以充分利用現(xiàn)有地基,不必像購(gòu)入新設(shè)備時(shí)那樣需重新構(gòu)筑地基。 </p><p> 3.3.5 可以采用最新的控制技術(shù) </p>
23、<p> 可根據(jù)技術(shù)革新的發(fā)展速度,及時(shí)地提高生產(chǎn)設(shè)備的自動(dòng)化水平和效率,提高設(shè)備質(zhì)量和檔次,將舊機(jī)床改成當(dāng)今水平的機(jī)床。 </p><p><b> 4 數(shù)控系統(tǒng)的選擇</b></p><p> 數(shù)控系統(tǒng)主要有三種類型,改造時(shí),應(yīng)根據(jù)具體情況進(jìn)行選擇。 </p><p> 4.1步進(jìn)電機(jī)拖動(dòng)的開(kāi)環(huán)系統(tǒng) </p>
24、;<p> 該系統(tǒng)的伺服驅(qū)動(dòng)裝置主要是步進(jìn)電機(jī)、功率步進(jìn)電機(jī)、電液脈沖馬達(dá)等。由數(shù)控系統(tǒng)送出的進(jìn)給指令脈沖,經(jīng)驅(qū)動(dòng)電路控制和功率放大后,使步進(jìn)電機(jī)轉(zhuǎn)動(dòng),通過(guò)齒輪副與滾珠絲杠副驅(qū)動(dòng)執(zhí)行部件。只要控制指令脈沖的數(shù)量、頻率以及通電順序,便可控制執(zhí)行部件運(yùn)動(dòng)的位移量、速度和運(yùn)動(dòng)方向。這種系統(tǒng)不需要將所測(cè)得的實(shí)際位置和速度反饋到輸入端,故稱之為開(kāi)環(huán)系統(tǒng),該系統(tǒng)的位移精度主要決定于步進(jìn)電機(jī)的角位移精度,齒輪絲杠等傳動(dòng)元件的節(jié)距精度,
25、所以系統(tǒng)的位移精度較低。 </p><p> 該系統(tǒng)結(jié)構(gòu)簡(jiǎn)單,調(diào)試維修方便,工作可靠,成本低,易改裝成功。 </p><p> 4.2異步電動(dòng)機(jī)或直流電機(jī)拖動(dòng),光柵測(cè)量反饋的閉環(huán)數(shù)控系統(tǒng) </p><p> 該系統(tǒng)與開(kāi)環(huán)系統(tǒng)的區(qū)別是:由光柵、感應(yīng)同步器等位置檢測(cè)裝置測(cè)得的實(shí)際位置反饋信號(hào),隨時(shí)與給定值進(jìn)行比較,將兩者的差值放大和變換,驅(qū)動(dòng)執(zhí)行機(jī)構(gòu),以給定的速度
26、向著消除偏差的方向運(yùn)動(dòng),直到給定位置與反饋的實(shí)際位置的差值等于零為止。閉環(huán)進(jìn)給系統(tǒng)在結(jié)構(gòu)上比開(kāi)環(huán)進(jìn)給系統(tǒng)復(fù)雜,成本也高,對(duì)環(huán)境室溫要求嚴(yán)。設(shè)計(jì)和調(diào)試都比開(kāi)環(huán)系統(tǒng)難。但是可以獲得比開(kāi)環(huán)進(jìn)給系統(tǒng)更高的精度,更快的速度,驅(qū)動(dòng)功率更大的特性指標(biāo)??筛鶕?jù)產(chǎn)品技術(shù)要求,決定是否采用這種系統(tǒng)。 </p><p> 4.3交/直流伺服電機(jī)拖動(dòng),編碼器反饋的半閉環(huán)數(shù)控系統(tǒng) </p><p> 半閉環(huán)系統(tǒng)
27、檢測(cè)元件安裝在中間傳動(dòng)件上,間接測(cè)量執(zhí)行部件的位置。它只能補(bǔ)償系統(tǒng)環(huán)路內(nèi)部部分元件的誤差,因此,它的精度比閉環(huán)系統(tǒng)的精度低,但是它的結(jié)構(gòu)與調(diào)試都較閉環(huán)系統(tǒng)簡(jiǎn)單。在將角位移檢測(cè)元件與速度檢測(cè)元件和伺服電機(jī)作成一個(gè)整體時(shí)則無(wú)需考慮位置檢測(cè)裝置的安裝問(wèn)題。 </p><p> 當(dāng)前生產(chǎn)數(shù)控系統(tǒng)的公司廠家比較多,著名公司的如德國(guó)SIEMENS公司、日本FANUC公司。 </p><p> 選擇
28、數(shù)控系統(tǒng)時(shí)主要是根據(jù)數(shù)控改造后機(jī)床要達(dá)到的各種精度、驅(qū)動(dòng)電機(jī)的功率和用戶的要求。 </p><p> 5 數(shù)控改造中主要機(jī)械部件改裝探討</p><p> 一臺(tái)新的數(shù)控機(jī)床,在設(shè)計(jì)上要達(dá)到:有高的靜動(dòng)態(tài)剛度;運(yùn)動(dòng)副之間的摩擦系數(shù)小,傳動(dòng)無(wú)間隙;功率大;便于操作和維修。機(jī)床數(shù)控改造時(shí)應(yīng)盡量達(dá)到上述要求。不能認(rèn)為將數(shù)控裝置與普通機(jī)床連接在一起就達(dá)到了數(shù)控機(jī)床的要求,還應(yīng)對(duì)主要部件進(jìn)行相應(yīng)的
29、改造使其達(dá)到一定的設(shè)計(jì)要求,才能獲得預(yù)期的改造目的。 </p><p><b> 5.1滑動(dòng)導(dǎo)軌副 </b></p><p> 對(duì)數(shù)控車床來(lái)說(shuō),導(dǎo)軌除應(yīng)具有普通車床導(dǎo)向精度和工藝性外,還要有良好的耐摩擦、磨損特性,并減少因摩擦阻力而致死區(qū)。同時(shí)要有足夠的剛度,以減少導(dǎo)軌變形對(duì)加工精度的影響,要有合理的導(dǎo)軌防護(hù)和潤(rùn)滑。 </p><p>&l
30、t;b> 5.2齒輪副 </b></p><p> 一般機(jī)床的齒輪主要集中在主軸箱和變速箱中。為了保證傳動(dòng)精度,數(shù)控機(jī)床上使用的齒輪精度等級(jí)都比普通機(jī)床高。在結(jié)構(gòu)上要能達(dá)到無(wú)間隙傳動(dòng),因而改造時(shí),機(jī)床主要齒輪必須滿足數(shù)控機(jī)床的要求,以保證機(jī)床加工精度。 </p><p> 5.3滑動(dòng)絲杠與滾珠絲杠 </p><p> 絲杠傳動(dòng)直接關(guān)系到傳動(dòng)
31、鏈精度。絲杠的選用主要取決于加工件的精度要求和拖動(dòng)扭矩要求。被加工件精度要求不高時(shí)可采用滑動(dòng)絲杠,但應(yīng)檢查原絲杠磨損情況,如螺距誤差及螺距累計(jì)誤差以及相配螺母間隙。一般情況滑動(dòng)絲杠應(yīng)不低于6級(jí),螺母間隙過(guò)大則更換螺母。采用滑動(dòng)絲杠相對(duì)滾珠絲杠價(jià)格較低,但難以滿足精度較高的零件加工。 </p><p> 滾珠絲杠摩擦損失小,效率高,其傳動(dòng)效率可在90%以上;精度高,壽命長(zhǎng);啟動(dòng)力矩和運(yùn)動(dòng)時(shí)力矩相接近,可以降低電機(jī)
32、啟動(dòng)力矩。因此可滿足較高精度零件加工要求。 </p><p><b> 5.4安全防護(hù) </b></p><p> 必須以安全為前提。在機(jī)床改造中要根據(jù)實(shí)際情況采取相應(yīng)的措施,切不可忽視。滾珠絲杠副是精密元件,工作時(shí)要嚴(yán)防灰塵特別是切屑及硬砂粒進(jìn)入滾道。在縱向絲杠上也可加整體鐵板防護(hù)罩。大拖板與滑動(dòng)導(dǎo)軌接觸的兩端面要密封好,絕對(duì)防止硬質(zhì)顆粒狀的異物進(jìn)入滑動(dòng)面損傷導(dǎo)
33、軌。</p><p> 6 數(shù)控改造幾個(gè)實(shí)例</p><p> 6.1用SIEMENS 810M改造X53銑床 </p><p> 2001年,用德國(guó)西門子810M數(shù)控系統(tǒng)、611A交流伺服驅(qū)動(dòng)系統(tǒng)對(duì)公司的一臺(tái)型號(hào)為X53的銑床進(jìn)行X、Y、Z三軸數(shù)控改造;保留了原有的主軸系統(tǒng)和冷卻系統(tǒng);改造的三軸在機(jī)械上采用了滾軸絲桿及齒輪傳動(dòng)機(jī)構(gòu)。整個(gè)改造工作包括機(jī)械設(shè)計(jì)、
34、電氣設(shè)計(jì)、PLC程序的編制與調(diào)試、機(jī)床大修,最后是整機(jī)的安裝和調(diào)試。銑床改造后,加工有效行程X/Y/Z軸分別為880/270/280 mm;最大速度X/Y/Z軸分別為5000/1500/800 mm/min;手動(dòng)速度X/Y/Z軸分別為3000/1000/500 mm/min;機(jī)床加工精度達(dá)到±0.001mm。機(jī)床的三坐標(biāo)聯(lián)動(dòng)可完成各種復(fù)雜曲線或曲面的加工。 </p><p> 6.2用GSK980T和
35、交流伺服驅(qū)動(dòng)系統(tǒng)改造C6140車床 </p><p> 2004年,GSK980T數(shù)控系統(tǒng)、DA98交流伺服單元及4工位自動(dòng)刀架對(duì)電機(jī)分廠的一臺(tái)C6140車床X、Z兩軸進(jìn)行數(shù)控改造;保留了原有的主軸系統(tǒng)和冷卻系統(tǒng);改造的兩軸在機(jī)械上采用了滾軸絲桿及同步帶傳動(dòng)機(jī)構(gòu)。整個(gè)改造工作包括機(jī)械設(shè)計(jì)、電氣設(shè)計(jì)、機(jī)床大修及整機(jī)的安裝和調(diào)試。車床改造后,加工有效行程X/Z軸分別為390/730 mm;最大速度X/Z軸分別為12
36、00/3000 mm/min;手動(dòng)速度為400mm/min;手動(dòng)快速為X/Z軸分別為1200/3000 mm/min;機(jī)床最小移動(dòng)單位為0.001mm。 </p><p> 6.3用SIEMENS 802S改造X53銑床 </p><p> 2004年,用德國(guó)西門子802S數(shù)控系統(tǒng)、步進(jìn)驅(qū)動(dòng)系統(tǒng)對(duì)公司的另一臺(tái)型號(hào)為X53的銑床進(jìn)行X、Y、Z三軸數(shù)控改造;保留了原有的主軸系統(tǒng)和冷卻系統(tǒng);
37、改造的三軸在機(jī)械上采用了滾軸絲桿及齒輪傳動(dòng)機(jī)構(gòu)。整個(gè)改造工作包括機(jī)械設(shè)計(jì)、電氣設(shè)計(jì)、機(jī)床大修,最后是整機(jī)的安裝和調(diào)試。銑床改造后,加工有效行程X/Y/Z軸分別為630/240/280 mm;最大速度X/Y/Z軸分別為3000/1000/600 mm/min;手動(dòng)進(jìn)給速度X/Y/Z軸分別為2000/800/500 mm/min;最小移動(dòng)單位為0.001mm。 </p><p> The Numerical Con
38、trol Engine Bed Transforms</p><p> Harvey B.M ackey</p><p> First , numerical control system development summary brief history and tendency </p><p> In 1946 the first electronic
39、accounting machine was born in the world, this indicated the humanity created has been possible to strengthen and partially to replace the mental labor the tool. It with the humanity these which in the agriculture, the i
40、ndustry society created only is strengthens the physical labor the tool to compare, got up the quantitive leap, entered the information society for the humanity to lay the foundation. </p><p> After 6 years
41、, in 1952, computer technology applied to the engine bed , the first numerical control engine bed were born in US. From this time on, the traditional engine bed has had the archery target change. Since nearly half centur
42、y, the numerical control system has experienced two stages and six generation of development. </p><p> 1.1 Numerical control (NC) stage (1952 ~ 1970) </p><p> The early computer operating spee
43、d is low, was not big to then science computation and the data processing influence, but could not adapt the engine bed real-time control request. The people can not but use numeral logic circuit "to build" to
44、become an engine bed special purpose computer to take the numerical control system, is called the hardware connection numerical control (HARD-WIRED NC), Jian Chengwei numerical control (NC). Along with the primary device
45、 development, this stage has had been</p><p> 1.2 Computer numerical control (CNC) stage (in 1970 ~ present) </p><p> In 1970, the general minicomputer already appeared and the mass production
46、. Thereupon transplants it takes the numerical control system the core part, from this time on entered the computer numerical control (CNC) the stage ("which should have computer in front of the general" two ch
47、aracters to abbreviate). In 1971, American INTEL Corporation in the world first time the computer two most cores part -- logic units and the controller, used the large scale integrated circuit technology integration <
48、/p><p> The microprocessor is applied to 1974 in the numerical control system. This is because minicomputer function too strong, controlled an engine bed ability to have wealthily (therefore once uses in contr
49、olling the multi- Taiwan engine bed at that time, called it group control), was inferior to used the microprocessor economy to be reasonable. Moreover then small machine reliability was not ideal. The early microprocesso
50、r speed and the function although insufficiently are also high, but may solve t</p><p> In 1990, PC machine (personal computer, domestic custom had called microcomputer) the performance has developed to the
51、 very high stage, may satisfiedly take the numerical control system core part the request. The numerical control system henceforth entered based on the PC stage. </p><p> In brief, the computer numerical co
52、ntrol stage has also experienced three generations. Namely 1970 fourth generation of -- minicomputer; 1974 five dynasties -- microprocessor and 1990 sixth generation -- (overseas was called PC-BASED) based on PC. </p&
53、gt;<p> Also must point out, although overseas already renamed as the computer numerical control (namely CNC).</p><p> Also must point out, although overseas already renamed as the computer numerica
54、l control (namely CNC), but our country still the custom called the numerical control (NC). Therefore we daily say "numerical control", the materially already was refers to "computer numerical control"
55、;. </p><p> 1.3 the numerical control future will develop tendency </p><p> 1.3.1 open style continues to, to develop based on the PC sixth generation of direction </p><p> The s
56、oftware and hardware resources has which based on PC are rich and so on the characteristic, the more numerical controls serial production factory can step onto this path. Uses PC machine to take at least its front end ma
57、chine, processes the man-machine contact surface, the programming, the association</p><p> Question and so on net correspondence, undertakes the numerical control duty by the original system. PC machine has
58、 the friendly man-machine contact surface, will popularize to all numerical controls system. The long-distance communication, the long-distance diagnosis and the service will be more common. </p><p> 1.3.2
59、approaches and the high accuracy development </p><p> This is adapts the engine bed to be high speed and the high accuracy direction need to develop. </p><p> 1.3.3 develops to the intellectua
60、lized direction </p><p> Along with the artificial intelligence in the computer domain unceasing seepage and the development, the numerical control system intellectualized degree unceasingly will enhance. &
61、lt;/p><p> (1) applies the adaptive control technology </p><p> The numerical control system can examine in the process some important information, and the automatic control system related parame
62、ter, achieves the improvement system running status the goal. </p><p> (2) introduces the expert system instruction processing </p><p> The skilled worker and expert's experience, the proc
63、essing general rule and the special rule store in the system, take the craft parameter database as the strut, the establishment has the artificial intelligence the expert system. </p><p> (3) introduces the
64、 breakdown to diagnose the expert system </p><p> (4) intellectualized numeral servo drive </p><p> May through the automatic diagnosis load, but the automatic control parameter, causes the ac
65、tuation system to obtain the best movement.</p><p> Second, engine bed numerical control transformation necessity </p><p> 2.1 microscopic looks at the transformation the necessity </p>
66、<p> From on microscopic looked below that, the numerical control engine bed has the prominent superiority compared to the traditional engine bed, moreover these superiority come from the computer might which the
67、numerical control system contains. </p><p> 2.1.1 may process the traditional engine bed cannot process the curve, the curved surface and so on the complex components. </p><p> Because the com
68、puter has the excellent operation ability, may the instant accurately calculate each coordinate axis instant to be supposed the movement physiological load of exercise, therefore may turn round the synthesis complex curv
69、e or the curved surface. </p><p> 2.1.2 may realize the processing automation, moreover is the flexible automation, thus the efficiency may enhance 3 ~ 7 times compared to the traditional engine bed. </p
70、><p> Because the computer has the memory and the memory property, may the procedure which inputs remember and save, then the order which stipulated according to the procedure automatic carries out, thus reali
71、zation automation. The numerical control engine bed so long as replaces a procedure, may realize another work piece processing automation, thus causes the single unit and the small batch of production can automate, there
72、fore is called has realized "flexible automation". </p><p> 2.1.3 processings components precision high, size dispersion degree small, makes the assembly to be easy, no longer needs "to make
73、repairs".</p><p> 2.1.4 may realize the multi- working procedures centralism, reduces the components in engine bed between frequent transporting. </p><p> 2.1.5 has auto-alarm, the automa
74、tic monitoring, automatic compensation and so on the many kinds of autonomy function, thus may realize long time nobody to safeguard the processing. </p><p> 2.1.6 advantage which derives by above five. <
75、;/p><p> For example: Reduced worker's labor intensity, saved the labor force (a person to be possible to safeguard the multi- Taiwan engine bed), reduced the work clothes, reduced the new product trial ma
76、nufacturing cycle and the production cycle, might to the market demand make rapid reaction and so on. </p><p> Above these superiority are the predecessor cannot imagine, is an extremely significant breakth
77、rough. In addition, the engine bed numerical control carries out FMC (flexible manufacture unit), FMS (flexible manufacture system) as well as CIMS (computer integration manufacture system) and so on the enterprise becom
78、ing an information based society transformation foundation. The numerical control technology already became the manufacturing industry automation the core technology and the foundation </p><p> 2.2 great wa
79、tches the transformation the necessity </p><p> From on macroscopic looked that, the industry developed country armed forces, the airplane weapon industry, in the end of the 70's, at the beginning of th
80、e 80's started the large-scale application numerical control engine bed. Its essence is, uses the information technology to the traditional industry (including the armed forces, airplane weapon industry) carries on t
81、he technological transformations. Except that uses outside the numerical control engine bed, FMC, FMS in the manufacture process, </p><p> Thord, the numerical control transformation content and superiorly
82、lacks </p><p> 3.1 Transformation industry starting </p><p> In US, Japan and Germany and so on the developed country, their engine bed transforms took the new economical growth profession, th
83、rives abundantly, is occupying the golden age. As a result of the engine bed as well as the technical unceasing progress, the engine bed transformation is "the eternal" topic. Our country's engine bed trans
84、formation industry, also enters from the old profession to by the numerical control technology primarily new profession. In US, Japan, Germany, have the broad mark</p><p> 3.2 Numerical control transformati
85、on content </p><p> The engine bed and the production line numerical control transformation main content has following several points: </p><p> First is extensively recovers the function, to t
86、he engine bed, the production line has the breakdown partially to carry on the diagnosis and the restoration; </p><p> Second is NC, the addend reveals the installment on the ordinary engine bed, or adds th
87、e numerical control system, transforms the NC engine bed, the CNC engine bed; </p><p> Third is renovates, for increases the precision, the efficiency and the automaticity, to the machinery, the electricity
88、 partially carries on renovates, reassembles the processing to the machine part, extensively recovers the precision; Does not satisfy the production request to it the CNC system to carry on the renewal by newest CNC; <
89、;/p><p> Fourth is the technology renews or the technical innovation, for enhances the performance or the scale, or in order to use the new craft, the new technology, carries on the big scale in the original f
90、oundation the technology to renew or the technical innovation, the great scope raises the level and the scale renewal transformation. The new electrical system transforms after, how carries on the debugging as well as
91、 the determination reasonable approval standard, also is the technology preparat</p><p> 3.3 The numerical control transformation superiorly lacks </p><p> 3.3.1 reduced investment costs, the
92、date of delivery are short</p><p> With purchases the new engine bed to compare, may save 60% ~ 80% expense generally, the transformation expense is low. Large-scale, the special engine bed especially is sp
93、ecially obvious. The common large-scale engine bed transforms, only spends the new engine bed purchase expense 1/3, the date of delivery is short. But some peculiar circumstances, like the high speed main axle, the tray
94、automatic switching unit manufacture and the installment too requires a lot of work, costs a great deal of mo</p><p> 3.3.2 machine capability stable are reliable, the structure is limited </p><p
95、> Uses foundation and so on lathe bed, column all is heavy but the firm casting component, but is not that kind of welding component, after the transformation engine bed performance high, the quality is good, may tak
96、e the new equipment continues to use many years. But receives the original mechanism the limit, not suitably makes the unprecedented transformation. </p><p> 3.3.3 familiar understood the equipment, is adva
97、ntageous for the operation service </p><p> When purchases the new equipment, did not understand whether the new equipment can satisfy its processing request. The transformation then otherwise, may precisel
98、y calculate the engine bed the processing ability; Moreover, because many years use, the operator already understood to the engine bed characteristic, uses and services the aspect to train the time in the operation short
99、, effective is quick. The transformation engine bed as soon as installs, may realize the capacity load revolution. </p><p> 3.3.4 may fully use the existing condition </p><p> May fully use th
100、e existing ground, does not need to like buys when the new equipment such to have reto construct the ground. </p><p> 3.3.5 may use the newest control technology </p><p> enhances the producti
101、on equipment the automated level and the efficiency, improves the equipment quality and the scale, alters to the old engine bed now the horizontal engine bed.</p><p> Fourth, numerical control system choice
102、 </p><p> When the numerical control system mainly has three kind of types, the transformation, should act according to the special details to carry on the choice. </p><p> 4.1 Step-by-steps t
103、he open system which the electrical machinery drives </p><p> This system servo drive mainly is step-by-steps the electrical machinery, the power step-by-steps the electrical machinery, the battery solution
104、 pulse motor and so on. Entering sends out which by the numerical control system for instruction pulse, after the actuation electric circuit control and the power enlargement, causes to step-by-step the electrical machin
溫馨提示
- 1. 本站所有資源如無(wú)特殊說(shuō)明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒(méi)有圖紙預(yù)覽就沒(méi)有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 眾賞文庫(kù)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- 數(shù)控機(jī)床改造外文翻譯
- 外文翻譯--數(shù)控機(jī)床改造
- 外文翻譯--數(shù)控機(jī)床改造
- 外文翻譯---數(shù)控機(jī)床改造
- 外文翻譯=數(shù)控機(jī)床的特點(diǎn)=中文1600字
- 外文翻譯--數(shù)控機(jī)床的改造
- 數(shù)控機(jī)床改造外文資料翻譯
- 外文翻譯--數(shù)控機(jī)床 中文版
- 外文翻譯--數(shù)控機(jī)床 中文版.doc
- 外文翻譯--數(shù)控機(jī)床 中文版.doc
- 數(shù)控機(jī)床改造畢業(yè)論文外文翻譯
- 數(shù)控機(jī)床外文翻譯
- 數(shù)控機(jī)床外文翻譯
- 外文翻譯--數(shù)控機(jī)床
- 外文翻譯--數(shù)控機(jī)床.doc
- 外文翻譯--數(shù)控機(jī)床.doc
- 數(shù)控機(jī)床外文翻譯3
- 外文翻譯--數(shù)控機(jī)床.doc
- 數(shù)控機(jī)床外文翻譯(2)
- 外文翻譯--數(shù)控機(jī)床.doc
評(píng)論
0/150
提交評(píng)論