外文翻譯--數(shù)控機(jī)床的改造

1、<p><b>　　數(shù)控機(jī)床的改造</b></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，為人類進(jìn)入信息社會(huì)奠定了基礎(chǔ)。</p><p>　　六

2、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，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&qu

3、ot;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><p>　　到1970年，通用小型計(jì)算機(jī)業(yè)已出現(xiàn)并成批生

4、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）。 </p><p>　　到1974年微處理器被應(yīng)用于數(shù)控系

5、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

6、。 </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)向開放式、基于PC的第六代方向發(fā)展 </p><p>　　基于PC

7、所具有的開放性、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 </p><p>　　這是適應(yīng)機(jī)床向高速和高精度方向

8、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>　?。?）應(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)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>

9、<p>　?。?）引入專家系統(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>　　（3）引入故障診斷專家系統(tǒng) </p><p>　?。?）智能化數(shù)字伺服驅(qū)動(dòng)裝置 </p><p>　　可以通過(guò)自動(dòng)識(shí)別負(fù)載，而自動(dòng)調(diào)

10、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>　　2.1.1 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

11、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

12、，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>　　2.2 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、80年代初已開始大規(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。

13、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)力大為增強(qiáng)。 </p><p>　　3 數(shù)控化改造的內(nèi)容及缺乏</p>&

14、lt;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

15、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>　　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

16、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，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C

17、NC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)控化改造的缺乏</p><p>　　3.3.1　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)

18、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，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

19、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，見效

20、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><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

21、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)的開環(huán)系統(tǒng)</p><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

22、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，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

23、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)上比開環(huán)進(jìn)給系統(tǒng)

24、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)試都比開環(huán)系統(tǒng)難。但是可以獲得比開環(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)。可根據(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)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

25、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>

26、;<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>

27、　　5.1 滑動(dòng)導(dǎo)軌副 </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><b>　　5.2 齒輪副 </b></p><p>　　一般機(jī)床的齒輪主要集中在主軸

28、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)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，

29、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)啟動(dòng)力矩。因此可滿足較高精度零件加工要求。 </p><p>　　5.4 安全防護(hù) </p

30、><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)軌。</p><p>　　The Numerical Control Engine Bed Transforms</p>

31、<p>　　First numerical control system development summary brief history and tendency </p><p>　　In 1946 the first electronic accounting machine was born in the world, this indicated the humanity create

32、d has been possible to strengthen and partially to replace the mental labor the tool. It with the humanity these which in the agriculture, the industry society created only is strengthens the physical labor the tool to c

33、ompare, got up the quantitive leap, entered the information society for the humanity to lay the foundation. </p><p>　　After 6 years, in 1952, computer technology applied to the engine bed , the first numeric

34、al control engine bed were born in US. From this time on, the traditional engine bed has had the archery target change. Since nearly half century, the numerical control system has experienced two stages and six generatio

35、n of development. </p><p>　　1.1 Numerical control (NC) stage (1952 ～ 1970) </p><p>　　The early computer operating speed is low, was not big to then science computation and the data processing in

36、fluence, but could not adapt the engine bed real-time control request. The people can not but use numeral logic circuit "to build" to become an engine bed special purpose computer to take the numerical control

37、system, is called the hardware connection numerical control (HARD-WIRED NC), Jian Chengwei numerical control (NC). Along with the primary device development, this stage has had been</p><p>　　1.2 Computer num

38、erical control (CNC) stage (in 1970 ~ present) </p><p>　　In 1970, the general minicomputer already appeared and the mass production. Thereupon transplants it takes the numerical control system the core part,

39、 from this time on entered the computer numerical control (CNC) the stage ("which should have computer in front of the general" two characters to abbreviate). In 1971, American INTEL Corporation in the world fi

40、rst time the computer two most cores part -- logic units and the controller, used the large scale integrated circuit technology integration </p><p>　　The microprocessor is applied to 1974 in the numerical co

41、ntrol system. This is because minicomputer function too strong, controlled an engine bed ability to have wealthily (therefore once uses in controlling the multi- Taiwan engine bed at that time, called it group control),

42、was inferior to used the microprocessor economy to be reasonable. Moreover then small machine reliability was not ideal. The early microprocessor speed and the function although insufficiently are also high, but may solv

43、e t</p><p>　　In 1990, PC machine (personal computer, domestic custom had called microcomputer) the performance has developed to the very high stage, may satisfiedly take the numerical control system core par

44、t the request. The numerical control system henceforth entered based on the PC stage. </p><p>　　In brief, the computer numerical control stage has also experienced three generations. Namely 1970 fourth gener

45、ation of -- minicomputer; 1974 five dynasties -- microprocessor and 1990 sixth generation -- (overseas was called PC-BASED) based on PC. </p><p>　　Also must point out, although overseas already renamed as th

46、e computer numerical control (namely CNC).</p><p>　　Also must point out, although overseas already renamed as the computer numerical control (namely CNC), but our country still the custom called the numerica

47、l control (NC). Therefore we daily say "numerical control", the materially already was refers to "computer numerical control". </p><p>　　1.3 the numerical control future will develop tend

48、ency </p><p>　　1.3.1 open style continues to, to develop based on the PC sixth generation of direction </p><p>　　The software and hardware resources has which based on PC are rich and so on the

49、characteristic, the more numerical controls serial production factory can step onto this path. Uses PC machine to take at least its front end machine, processes the man-machine contact surface, the programming, the assoc

50、iation</p><p>　　1.3.2 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>

51、　　1.3.3 develops to the intellectualized direction </p><p>　　Along with the artificial intelligence in the computer domain unceasing seepage and the development, the numerical control system intellectualized

52、 degree unceasingly will enhance. </p><p>　　(1) applies the adaptive control technology </p><p>　　The numerical control system can examine in the process some important information, and the auto

53、matic control system related parameter, achieves the improvement system running status the goal. </p><p>　　(2) introduces the expert system instruction processing </p><p>　　The skilled worker an

54、d expert's experience, the processing 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

55、><p>　　(3) introduces the breakdown to diagnose the expert system </p><p>　　(4) intellectualized numeral servo drive </p><p>　　May through the automatic diagnosis load, but the automat

56、ic control parameter, causes the actuation system to obtain the best movement.</p><p>　　Second engine bed numerical control transformation necessity </p><p>　　2.1 microscopic looks at the tran

57、sformation the necessity </p><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 com

58、e from the computer might which the 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<

59、/p><p>　　Because the computer 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 tur

60、n round the synthesis complex curve 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 t

61、he traditional engine bed</p><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 au

62、tomatic carries out, thus realization 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

63、 production can automate, therefore is called has realized "flexible automation". </p><p>　　2.2 great watches the transformation the necessity </p><p>　　From on macroscopic looked that

64、, the industry developed country armed forces, the airplane weapon industry, in the end of the 70's, at the beginning of the 80's started the large-scale application numerical control engine bed. Its essence is,

65、uses the information technology to the traditional industry (including the armed forces, airplane weapon industry) carries on the technological transformations. Except that uses outside the numerical control engine bed,

66、FMC, FMS in the manufacture process, </p><p>　　Third the numerical control transformation content and superiorly lacks </p><p>　　3.1 Transformation industry starting </p><p>　　In U

67、S, Japan and Germany and so on the developed country, their engine bed transforms took the new economical growth profession, thrives abundantly, is occupying the golden age. As a result of the engine bed as well as the t

68、echnical unceasing progress, the engine bed transformation is "the eternal" topic. Our country's engine bed transformation industry, also enters from the old profession to by the numerical control technolog

69、y primarily new profession. In US, Japan, Germany, have the broad mark</p><p>　　3.2 Numerical control transformation content </p><p>　　The engine bed and the production line numerical control tr

70、ansformation main content has following several points: </p><p>　　First is extensively recovers the function, to the engine bed, the production line has the breakdown partially to carry on the diagnosis and

71、the restoration; </p><p>　　Second is NC, the addend reveals the installment on the ordinary engine bed, or adds the numerical control system, transforms the NC engine bed, the CNC engine bed; </p><

72、;p>　　Third is renovates, for increases the precision, the efficiency and the automaticity, to the machinery, the electricity partially carries on renovates, reassembles the processing to the machine part, extensively

73、recovers the precision; Does not satisfy the production request to it the CNC system to carry on the renewal by newest CNC; </p><p>　　Fourth is the technology renews or the technical innovation, for enhances

74、 the performance or the scale, or in order to use the new craft, the new technology, carries on the big scale in the original foundation the technology to renew or the technical innovation, the great scope raises the lev

75、el and the scale renewal transformation. The new electrical system transforms after, how carries on the debugging as well as the determination reasonable approval standard, also is the technology preparat</p>&

76、lt;p>　　3.3 The numerical control transformation superiorly lacks </p><p>　　3.3.1 reduced investment costs, the date of delivery are short</p><p>　　With purchases the new engine bed to compare

77、, may save 60% ~ 80% expense generally, the transformation expense is low. Large-scale, the special engine bed especially is specially obvious. The common large-scale engine bed transforms, only spends the new engine bed

78、 purchase expense 1/3, the date of delivery is short. But some peculiar circumstances, like the high speed main axle, the tray automatic switching unit manufacture and the installment too requires a lot of work, costs a

79、great deal of mo</p><p>　　3.3.2 machine capability stable are reliable, the structure is limited </p><p>　　Uses foundation and so on lathe bed, column all is heavy but the firm casting component

80、, but is not that kind of welding component, after the transformation engine bed performance high, the quality is good, may take the new equipment continues to use many years. But receives the original mechanism the limi

81、t, not suitably makes the unprecedented transformation. </p><p>　　3.3.3 familiar understood the equipment, is advantageous for the operation service </p><p>　　When purchases the new equipment, d

82、id not understand whether the new equipment can satisfy its processing request. The transformation then otherwise, may precisely calculate the engine bed the processing ability; Moreover, because many years use, the oper

83、ator already understood to the engine bed characteristic, uses and services the aspect to train the time in the operation short, effective is quick. The transformation engine bed as soon as installs, may realize the capa

84、city load revolution. </p><p>　　3.3.4 may fully use the existing condition </p><p>　　May fully use the existing ground, does not need to like buys when the new equipment such to have reto constr

85、uct the ground. </p><p>　　3.3.5 may use the newest control technology </p><p>　　enhances the production equipment the automated level and the efficiency, improves the equipment quality and the s

86、cale, alters to the old engine bed now the horizontal engine bed.</p><p>　　Fourth, numerical control system choice </p><p>　　When the numerical control system mainly has three kind of types, the

87、 transformation, should act according to the special details to carry on the choice. </p><p>　　4.1 Step-by-steps the open system which the electrical machinery drives </p><p>　　This system servo

88、 drive mainly is step-by-steps the electrical machinery, the power step-by-steps the electrical machinery, the battery solution pulse motor and so on. Entering sends out which by the numerical control system for instruct

89、ion pulse, after the actuation electric circuit control and the power enlargement, causes to step-by-step the electrical machinery rotation, through gear vice- and ball bearing guide screw vice- actuation executive compo

90、nent. So long as the control command pulse </p><p>　　This system structure simple, debugging service convenient, work reliable, cost low, is easy to reequip successfully. </p><p>　　4.2 The async

91、hronous motor or the direct current machine drive, diffraction grating survey feedback closed loop numerical control system </p><p>　　This system and the open system difference is: Physical location feedback

92、 signal which by position detector set and so on the diffraction grating, induction synchromesh obtains, carries on the comparison as necessary with the given value, two interpolations enlargements and the transformation

93、, the actuation implementing agency, by the speed which assigns turns towards the elimination deviation the direction movement, until assigns the position and the feedback physical location interpolation is </p>&

94、lt;p>　　Enters for the system complex in the structure compared to the split-ring, the cost is also high, requests strictly to the environment room temperature. The design and the debugging is all more difficult than t

95、he open system. But may obtain compared to the split-ring enters for a system higher precision, quicker speed, actuation power bigger characteristic target. May act according to the product specification, decided whether

96、 uses this kind of system. </p><p>　　4.3 The direct current servo electrical machinery drives, encoder feedback semi-closure link numerical control system </p><p>　　Half closed-loop system exami

97、nation part installs in among passes in the moving parts, indirectly surveys the executive component the position. It only can compensate a system ring circuit interior part of part the error, therefore, its precision co

98、mpared to closed-loop system precision low, but its structure and the debugging all compares the closed-loop system to be simple. In makes the angular displacement examination part and the speed examination part and the

99、servo electrical machinery time</p><p>　　The current production numerical control system company factory quite are many, overseas famous company like German SIEMENS Corporation, Japanese FANUC Corporation; N

100、ative corporation like China Mount Everest Corporation, Beijing astronautics engine bed numerical control system group company, Central China numerical control company and Shenyang upscale numerical control country engin

101、eering research center. </p><p>　　When choice numerical control system mainly is each kind of precision which the engine bed must achieve after the numerical control transformation, actuates the electrical m