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數(shù)控機床改造
1 數(shù)控系統(tǒng)發(fā)展簡史及趨勢
1946年誕生了世界上第一臺電子計算機，這表明人類創(chuàng)造了可增強和部分代替腦力勞動的工具。它與人類在農(nóng)業(yè)、工業(yè)社會中創(chuàng)造的那些只是增強體力勞動的工具相比，起了質(zhì)的飛躍，為人類進入信息社會奠定了基礎(chǔ)。
6年后，即在1952年，計算機技術(shù)應(yīng)用到了機床上，在美國誕生了第一臺數(shù)控機床。從此，傳統(tǒng)機床產(chǎn)生了質(zhì)的變化。近半個世紀以來，數(shù)控系統(tǒng)經(jīng)歷了兩個階段和六代的發(fā)展。
1.1 數(shù)控（NC）階段（1952～1970年）
早期計算機的運算速度低，對當時的科學(xué)計算和數(shù)據(jù)處理影響還不大，但不能適應(yīng)機床實時控制的要求。人們不得不采用數(shù)字邏輯電路"搭"成一臺機床專用計算機作為數(shù)控系統(tǒng)，被稱為硬件連接數(shù)控（HARD-WIRED NC），簡稱為數(shù)控（NC）。隨著元器件的發(fā)展，這個階段歷經(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。
1.2 計算機數(shù)控（CNC）階段（1970年～現(xiàn)在）
到1970年，通用小型計算機業(yè)已出現(xiàn)并成批生產(chǎn)。于是將它移植過來作為數(shù)控系統(tǒng)的核心部件，從此進入了計算機數(shù)控（CNC）階段（把計算機前面應(yīng)有的"通用"兩個字省略了）。到1971年，美國INTEL公司在世界上第一次將計算機的兩個最核心的部件--運算器和控制器，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（簡稱CPU）。
到1974年微處理器被應(yīng)用于數(shù)控系統(tǒng)。這是因為小型計算機功能太強，控制一臺機床能力有富裕（故當時曾用于控制多臺機床，稱之為群控），不如采用微處理器經(jīng)濟合理。而且當時的小型機可靠性也不理想。早期的微處理器速度和功能雖還不夠高，但可以通過多處理器結(jié)構(gòu)來解決。由于微處理器是通用計算機的核心部件，故仍稱為計算機數(shù)控。
到了1990年，PC機的性能已發(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)從此進入了基于PC的階段。
總之，計算機數(shù)控階段也經(jīng)歷了三代。即1970年的第四代--小型計算機；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）。
1.3 數(shù)控未來發(fā)展的趨勢
1.3.1 繼續(xù)向開放式、基于PC的第六代方向發(fā)展
基于PC所具有的開放性、低成本、高可靠性、軟硬件資源豐富等特點，更多的數(shù)控系統(tǒng)生產(chǎn)廠家會走上這條道路。至少采用PC機作為它的前端機，來處理人機界面、編程、聯(lián)網(wǎng)通信等問題，由原有的系統(tǒng)承擔數(shù)控的任務(wù)。PC機所具有的友好的人機界面，將普及到所有的數(shù)控系統(tǒng)。遠程通訊，遠程診斷和維修將更加普遍。
1.3.2 向高速化和高精度化發(fā)展
這是適應(yīng)機床向高速和高精度方向發(fā)展的需要。
1.3.3 向智能化方向發(fā)展
隨著人工智能在計算機領(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。
（1）應(yīng)用自適應(yīng)控制技術(shù)
數(shù)控系統(tǒng)能檢測過程中一些重要信息，并自動調(diào)整系統(tǒng)的有關(guān)參數(shù)，達到改進系統(tǒng)運行狀態(tài)的目的。
?。?）引入專家系統(tǒng)指導(dǎo)加工
將熟練工人和專家的經(jīng)驗，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)庫為支撐，建立具有人工智能的專家系統(tǒng)。
??（3）引入故障診斷專家系統(tǒng)
?。?）智能化數(shù)字伺服驅(qū)動裝置
可以通過自動識別負載，而自動調(diào)整參數(shù)，使驅(qū)動系統(tǒng)獲得最佳的運行。
2 機床數(shù)控化改造的必要性
2.1 微觀看改造的必要性
從微觀上看，數(shù)控機床比傳統(tǒng)機床有以下突出的優(yōu)越性，而且這些優(yōu)越性均來自數(shù)控系統(tǒng)所包含的計算機的威力。
2.1.1 可以加工出傳統(tǒng)機床加工不出來的曲線、曲面等復(fù)雜的零件。
由于計算機有高超的運算能力，可以瞬時準確地計算出每個坐標軸瞬時應(yīng)該運動的運動量，因此可以復(fù)合成復(fù)雜的曲線或曲面。
2.1.2 可以實現(xiàn)加工的自動化，而且是柔性自動化，從而效率可比傳統(tǒng)機床提高3～7倍。
由于計算機有記憶和存儲能力，可以將輸入的程序記住和存儲下來，然后按程序規(guī)定的順序自動去執(zhí)行，從而實現(xiàn)自動化。數(shù)控機床只要更換一個程序，就可實現(xiàn)另一工件加工的自動化，從而使單件和小批生產(chǎn)得以自動化，故被稱為實現(xiàn)了"柔性自動化"。
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"。
2.1.4 可實現(xiàn)多工序的集中，減少零件 在機床間的頻繁搬運。
2.1.5 擁有自動報警、自動監(jiān)控、自動補償?shù)榷喾N自律功能，因而可實現(xiàn)長時間無人看管加工。
2.1.6 由以上五條派生的好處。
如：降低了工人的勞動強度，節(jié)省了勞動力（一個人可以看管多臺機床），減少了工裝，縮短了新產(chǎn)品試制周期和生產(chǎn)周期，可對市場需求作出快速反應(yīng)等等。
以上這些優(yōu)越性是前人想象不到的，是一個極為重大的突破。此外，機床數(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（計算機集成制造系統(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)自動化的核心技術(shù)和基礎(chǔ)技術(shù)。
2.2 宏觀看改造的必要性
從宏觀上看，工業(yè)發(fā)達國家的軍、民機械工業(yè)，在70年代末、80年代初已開始大規(guī)模應(yīng)用數(shù)控機床。其本質(zhì)是，采用信息技術(shù)對傳統(tǒng)產(chǎn)業(yè)（包括軍、民機械工業(yè)）進行技術(shù)改造。除在制造過程中采用數(shù)控機床、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)對國外軍、民機械工業(yè)進行深入改造（稱之為信息化），最終使得他們的產(chǎn)品在國際軍品和民品的市場上競爭力大為增強。
3 數(shù)控化改造的內(nèi)容及優(yōu)缺
3.1 數(shù)控改造業(yè)的興起
在美國、日本和德國等國家，機床改造作為新的經(jīng)濟增長行業(yè)，生意盎然，正處在黃金時代。由于機床以及技術(shù)的不斷進步，機床改造是個"永恒"的課題。在美國、日本、德國，用數(shù)控技術(shù)改造機床和生產(chǎn)線具有廣闊的市場，已形成了機床和生產(chǎn)線數(shù)控改造的新的行業(yè)。在美國，機床改造業(yè)稱為機床再生（Remanufacturing）業(yè)。從事再生業(yè)的著名公司有：Bertsche工程公司、ayton機床公司、Devlieg-Bullavd（得寶）服務(wù)集團、US設(shè)備公司等。。在日本，機床改造業(yè)稱為機床改裝（Retrofitting）業(yè)。從事改裝業(yè)的著名公司有：大隈工程集團、崗三機械公司、千代田工機公司、野崎工程公司、濱田工程公司、山本工程公司等。
3.2 數(shù)控化改造的內(nèi)容
機床與生產(chǎn)線的數(shù)控化改造主要內(nèi)容有以下幾點：
其一是恢復(fù)原功能，對機床、生產(chǎn)線存在的故障部分進行診斷并恢復(fù)；
其二是NC化，在普通機床上加數(shù)顯裝置，或加數(shù)控系統(tǒng)，改造成NC機床、CNC機床；
其三是翻新，為提高精度、效率和自動化程度，對機械、電氣部分進行翻新，對機械部分重新裝配加工，恢復(fù)原精度；對其不滿足生產(chǎn)要求的CNC系統(tǒng)以最新CNC進行更新；
其四是技術(shù)更新或技術(shù)創(chuàng)新，為提高性能或檔次，或為了使用新工藝、新技術(shù)，在原有基礎(chǔ)上進行較大規(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。
3.3 數(shù)控化改造的優(yōu)缺
3.3.1 減少投資額、交貨期短
同購置新機床相比，一般可以節(jié)省60％～80％的費用，改造費用低。特別是大型、特殊機床尤其明顯。一般大型機床改造，只花新機床購置費用的1/3，交貨期短。但有些特殊情況，如高速主軸、托盤自動交換裝置的制作與安裝過于費工、費錢，往往改造成本提高2～3倍，與購置新機床相比，只能節(jié)省投資50％左右。
3.3.2 機械性能穩(wěn)定可靠，結(jié)構(gòu)受限
所利用的床身、立柱等基礎(chǔ)件都是重而堅固的鑄造構(gòu)件，而不是那種焊接構(gòu)件，改造后的機床性能高、質(zhì)量好，可以作為新設(shè)備繼續(xù)使用多年。但是受到原來機械結(jié)構(gòu)的限制，不宜做突破性的改造。
3.3.3 熟悉了解設(shè)備、便于操作維修
購買新設(shè)備時，不了解新設(shè)備是否能滿足其加工要求。改造則不然，可以精確地計算出機床的加工能力；另外，由于多年使用，操作者對機床的特性早已了解，在操作使用和維修方面培訓(xùn)時間短，見效快。改造的機床一安裝好，就可以實現(xiàn)全負荷運轉(zhuǎn)。
3.3.4 可充分利用現(xiàn)有的條件
可以充分利用現(xiàn)有地基，不必像購入新設(shè)備時那樣需重新構(gòu)筑地基。
3.3.5 可以采用最新的控制技術(shù)
可根據(jù)技術(shù)革新的發(fā)展速度，及時地提高生產(chǎn)設(shè)備的自動化水平和效率，提高設(shè)備質(zhì)量和檔次，將舊機床改成當今水平的機床。
4 數(shù)控系統(tǒng)的選擇
數(shù)控系統(tǒng)主要有三種類型，改造時，應(yīng)根據(jù)具體情況進行選擇。
4.1 步進電機拖動的開環(huán)系統(tǒng)
??? 該系統(tǒng)的伺服驅(qū)動裝置主要是步進電機、功率步進電機、電液脈沖馬達等。由數(shù)控系統(tǒng)送出的進給指令脈沖，經(jīng)驅(qū)動電路控制和功率放大后，使步進電機轉(zhuǎn)動，通過齒輪副與滾珠絲杠副驅(qū)動執(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)行部件運動的位移量、速度和運動方向。這種系統(tǒng)不需要將所測得的實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電機的角位移精度，齒輪絲杠等傳動元件的節(jié)距精度，所以系統(tǒng)的位移精度較低。
該系統(tǒng)結(jié)構(gòu)簡單，調(diào)試維修方便，工作可靠，成本低，易改裝成功。
4.2 異步電動機或直流電機拖動，光柵測量反饋的閉環(huán)數(shù)控系統(tǒng)
??? 該系統(tǒng)與開環(huán)系統(tǒng)的區(qū)別是：由光柵、感應(yīng)同步器等位置檢測裝置測得的實際位置反饋信號，隨時與給定值進行比較，將兩者的差值放大和變換，驅(qū)動執(zhí)行機構(gòu)，以給定的速度向著消除偏差的方向運動，直到給定位置與反饋的實際位置的差值等于零為止。閉環(huán)進給系統(tǒng)在結(jié)構(gòu)上比開環(huán)進給系統(tǒng)復(fù)雜，成本也高，對環(huán)境室溫要求嚴。設(shè)計和調(diào)試都比開環(huán)系統(tǒng)難。但是可以獲得比開環(huán)進給系統(tǒng)更高的精度，更快的速度，驅(qū)動功率更大的特性指標。可根據(jù)產(chǎn)品技術(shù)要求，決定是否采用這種系統(tǒng)。
4.3 交/直流伺服電機拖動，編碼器反饋的半閉環(huán)數(shù)控系統(tǒng)
??? 半閉環(huán)系統(tǒng)檢測元件安裝在中間傳動件上，間接測量執(zhí)行部件的位置。它只能補償系統(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)簡單。在將角位移檢測元件與速度檢測元件和伺服電機作成一個整體時則無需考慮位置檢測裝置的安裝問題。
當前生產(chǎn)數(shù)控系統(tǒng)的公司廠家比較多，著名公司的如德國SIEMENS公司、日本FANUC公司。
??? 選擇數(shù)控系統(tǒng)時主要是根據(jù)數(shù)控改造后機床要達到的各種精度、驅(qū)動電機的功率和用戶的要求。
5 數(shù)控改造中主要機械部件改裝探討
一臺新的數(shù)控機床，在設(shè)計上要達到：有高的靜動態(tài)剛度；運動副之間的摩擦系數(shù)小，傳動無間隙；功率大；便于操作和維修。機床數(shù)控改造時應(yīng)盡量達到上述要求。不能認為將數(shù)控裝置與普通機床連接在一起就達到了數(shù)控機床的要求，還應(yīng)對主要部件進行相應(yīng)的改造使其達到一定的設(shè)計要求，才能獲得預(yù)期的改造目的。
5.1 滑動導(dǎo)軌副
??? 對數(shù)控車床來說，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)。同時要有足夠的剛度，以減少導(dǎo)軌變形對加工精度的影響，要有合理的導(dǎo)軌防護和潤滑。
5.2 齒輪副
??? 一般機床的齒輪主要集中在主軸箱和變速箱中。為了保證傳動精度，數(shù)控機床上使用的齒輪精度等級都比普通機床高。在結(jié)構(gòu)上要能達到無間隙傳動，因而改造時，機床主要齒輪必須滿足數(shù)控機床的要求，以保證機床加工精度。
5.3 滑動絲杠與滾珠絲杠
??? 絲杠傳動直接關(guān)系到傳動鏈精度。絲杠的選用主要取決于加工件的精度要求和拖動扭矩要求。被加工件精度要求不高時可采用滑動絲杠，但應(yīng)檢查原絲杠磨損情況，如螺距誤差及螺距累計誤差以及相配螺母間隙。一般情況滑動絲杠應(yīng)不低于6級，螺母間隙過大則更換螺母。采用滑動絲杠相對滾珠絲杠價格較低，但難以滿足精度較高的零件加工。
滾珠絲杠摩擦損失小，效率高，其傳動效率可在90%以上；精度高，壽命長；啟動力矩和運動時力矩相接近，可以降低電機啟動力矩。因此可滿足較高精度零件加工要求。
5.4 安全防護
必須以安全為前提。在機床改造中要根據(jù)實際情況采取相應(yīng)的措施，切不可忽視。滾珠絲杠副是精密元件，工作時要嚴防灰塵特別是切屑及硬砂粒進入滾道。在縱向絲杠上也可加整體鐵板防護罩。大拖板與滑動導(dǎo)軌接觸的兩端面要密封好，絕對防止硬質(zhì)顆粒狀的異物進入滑動面損傷導(dǎo)軌。
6 數(shù)控改造幾個實例
6.1 用SIEMENS 810M改造X53銑床
??? 2001年，用德國西門子810M數(shù)控系統(tǒng)、611A交流伺服驅(qū)動系統(tǒng)對公司的一臺型號為X53的銑床進行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)；改造的三軸在機械上采用了滾軸絲桿及齒輪傳動機構(gòu)。整個改造工作包括機械設(shè)計、電氣設(shè)計、PLC程序的編制與調(diào)試、機床大修，最后是整機的安裝和調(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；手動速度X/Y/Z軸分別為3000/1000/500 mm/min；機床加工精度達到±0.001mm。機床的三坐標聯(lián)動可完成各種復(fù)雜曲線或曲面的加工。
6.2 用GSK980T和交流伺服驅(qū)動系統(tǒng)改造C6140車床
??? 2004年，GSK980T數(shù)控系統(tǒng)、DA98交流伺服單元及4工位自動刀架對電機分廠的一臺C6140車床X、Z兩軸進行數(shù)控改造；保留了原有的主軸系統(tǒng)和冷卻系統(tǒng)；改造的兩軸在機械上采用了滾軸絲桿及同步帶傳動機構(gòu)。整個改造工作包括機械設(shè)計、電氣設(shè)計、機床大修及整機的安裝和調(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1200/3000 mm/min；手動速度為400mm/min；手動快速為X/Z軸分別為1200/3000 mm/min；機床最小移動單位為0.001mm。
6.3 用SIEMENS 802S改造X53銑床
??? 2004年，用德國西門子802S數(shù)控系統(tǒng)、步進驅(qū)動系統(tǒng)對公司的另一臺型號為X53的銑床進行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)；改造的三軸在機械上采用了滾軸絲桿及齒輪傳動機構(gòu)。整個改造工作包括機械設(shè)計、電氣設(shè)計、機床大修，最后是整機的安裝和調(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；手動進給速度X/Y/Z軸分別為2000/800/500 mm/min；最小移動單位為0.001mm。
外文文獻原文
The Numerical Control Engine Bed Transforms
1 numerical control system development summary brief history and tendency
In 1946 the first electronic 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 industry 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.
After 6 years, 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 century, the numerical control system has experienced two stages and six generation of development.
1.1 Numerical control (NC) stage (1952 ~ 1970)
The early computer operating speed 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 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 development, this stage has had been through repeatedly three generations, namely 1952 first generation of -- electron tube; 1959 second generation of -- transistor; 1965 third generation -- small scale integration electric circuit.
1.2 Computer numerical control (CNC) stage (in 1970 ~ present)
In 1970, the general minicomputer already appeared and the mass production. 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 characters 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 on together the chip, called it the microprocessor (MICROPROCESSOR), also might be called the central processing element (to be called CPU).
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 controlling 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 microprocessor speed and the function although insufficiently are also high, but may solve through the multi-processor structure. Because the microprocessor is the general-purpose calculator core part, therefore still was called the computer numerical control.
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 part the request. The numerical control system henceforth entered based on the PC stage.
In brief, the computer numerical control 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.
Also must point out, although overseas already renamed as the computer numerical control (namely CNC).
Also must point out, although overseas already renamed as the computer numerical 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".
1.3 the numerical control future will develop tendency
1.3.1 open style continues to, to develop based on the PC sixth generation of direction
The software 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 machine, processes the man-machine contact surface, the programming, the association
Question and so on net correspondence, undertakes the numerical control duty by the original system. PC machine has 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.
1.3.2 approaches and the high accuracy development
This is adapts the engine bed to be high speed and the high accuracy direction need to develop.
1.3.3 develops to the intellectualized direction
Along with the artificial intelligence in the computer domain unceasing seepage and the development, the numerical control system intellectualized degree unceasingly will enhance.
(1) applies the adaptive control technology
The numerical control system can examine in the process some important information, and the automatic control system related parameter, achieves the improvement system running status the goal.
(2) introduces the expert system instruction processing
The skilled worker and 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.
(3) introduces the breakdown to diagnose the expert system
(4) intellectualized numeral servo drive
May through the automatic diagnosis load, but the automatic control parameter, causes the actuation system to obtain the best movement.
2 engine bed numerical control transformation necessity
2.1 microscopic looks at the transformation the necessity
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 numerical control system contains.
2.1.1 may process the traditional engine bed cannot process the curve, the curved surface and so on the complex components.
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 turn round the synthesis complex curve or the curved surface.
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.
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 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 production can automate, therefore is called has realized "flexible automation".
2.1.3 processings components precision high, size dispersion degree small, makes the assembly to be easy, no longer needs "to make repairs".
2.1.4 may realize the multi- working procedures centralism, reduces the components in engine bed between frequent transporting.
2.1.5 has auto-alarm, the automatic monitoring, automatic compensation and so on the many kinds of autonomy function, thus may realize long time nobody to safeguard the processing.
2.1.6 advantage which derives by above five.
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 manufacturing cycle and the production cycle, might to the market demand make rapid reaction and so on.
Above these superiority are the predecessor cannot imagine, is an extremely significant breakthrough. 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 becoming an information based society transformation foundation. The numerical control technology already became the manufacturing industry automation the core technology and the foundation technology.
2.2 great watches the transformation the necessity
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 the 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 the technological transformations. Except that uses outside the numerical control engine bed, FMC, FMS in the manufacture process, but also includes in the product development carries out CAD, CAE, CAM, the hypothesized manufacture as well as carries out MIS in the production management (management information system), CIMS and so on. As well as increases the information technology in its production product, including artificial intelligence and so on content. Because uses the information technology to the country foreign troops, the airplane weapon industry carries on the thorough transformation (to call it becoming an information based society), finally causes them the product in the international military goods and in the goods for civilian use market the competitive power greatly is the enhancement. But we in the information technology transformation tradition industry aspect compared to the developed country to fall behind approximately for 20 years. Like in our country engine bed capacity, numerical control engine bed proportion (numerical control rate) to 1995 only then 1.9%, but Japan has reached 20.8% in 1994, therefore every year has the massive mechanical and electrical products import. This also on from on macroscopic explained the engine bed numerical control transformation necessity.
3 the numerical control transformation content and superiorly lacks
3.1 Transformation industry starting
In US, 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 technical 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 technology primarily new profession. In US, Japan, Germany, have the broad market with the numerical control technological transformations engine bed and the production line, has formed the engine bed and the production line numerical control transformation new profession. In US, the engine bed transformation industry is called the engine bed regeneration (Remanufacturing) industry. Is engaged in the regeneration industry famous company to include: The Bertsche engineering firm, the ayton engine bed company, Devlieg-Bullavd (are valuable) serves the group, the US equipment company and so on. The American valuable company has set up the company in China. In Japan, the engine bed transformation industry is called the engine bed to reequip (Retrofitting) industry. Is engaged in the reequipment industry famous company to include: Big indentation project group, hillock three mechanical companies, thousand substitute fields labor machine company, wild engineering firm, shore field engineering firm, mountain this engineering firm and so on.
3.2 Numerical control transformation content
The engine bed and the production line numerical control transformation main content has following several points:
First is extensively recovers the function, to the engine bed, the production line has the breakdown partially to carry on the diagnosis and the restoration;
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;
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 recovers the precision; Does not satisfy the production request to it the CNC system to carry on the renewal by newest CNC;
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 foundation 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 the determination reasonable approval standard, also is the technology preparatory work important link. The debugging work involves the machinery, the hydraulic pressure, the electricity, the control, and so on, therefore must carry on by the project person in charge, other personnel coordinate. The debugging step may conform to simplicity to numerous, from infancy to maturity, carries on from outside to in, after also may the partial overall situation, after first the subsystem the
3.3 The numerical control transformation superiorly lacks
3.3.1 reduced investment costs, the date of delivery are short
With purc