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  • 數控加工技術的意義
  • 本站編輯:杭(hang)州以鐵精密機械有限公司發布日期:2019-05-08 07:02

數(shu)(shu)控(kong)(kong)機(ji)(ji)床(chuang)一開始就選定具有復(fu)(fu)雜型面的(de)飛機(ji)(ji)零件(jian)作為加(jia)工(gong)對象,解決普通的(de)加(jia)工(gong)方法(fa)難以解決的(de)關(guan)鍵。數(shu)(shu)控(kong)(kong)加(jia)工(gong)的(de)一大特(te)點(dian)(dian)是用(yong)(yong)穿孔(kong)帶(dai)(或磁(ci)帶(dai))控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)機(ji)(ji)床(chuang)進行自動加(jia)工(gong)。由于(yu)飛機(ji)(ji)、火(huo)箭(jian)和發動機(ji)(ji)零件(jian)各有不同(tong)的(de)特(te)點(dian)(dian):飛機(ji)(ji)和火(huo)箭(jian)的(de)零、構(gou)(gou)件(jian)尺(chi)寸大、型面復(fu)(fu)雜;發動機(ji)(ji)零、構(gou)(gou)件(jian)尺(chi)寸小(xiao)、精度高。因此飛機(ji)(ji)、火(huo)箭(jian)制(zhi)(zhi)(zhi)(zhi)造(zao)部門(men)(men)和發動機(ji)(ji)制(zhi)(zhi)(zhi)(zhi)造(zao)部門(men)(men)所(suo)選用(yong)(yong)的(de)數(shu)(shu)控(kong)(kong)機(ji)(ji)床(chuang)有所(suo)不同(tong)。在飛機(ji)(ji)和火(huo)箭(jian)制(zhi)(zhi)(zhi)(zhi)造(zao)中(zhong)以采用(yong)(yong)連續控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)的(de)大型數(shu)(shu)控(kong)(kong)銑床(chuang)為主,而在發動機(ji)(ji)制(zhi)(zhi)(zhi)(zhi)造(zao)中(zhong)既采用(yong)(yong)連續控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)的(de)數(shu)(shu)控(kong)(kong)機(ji)(ji)床(chuang),也采用(yong)(yong)點(dian)(dian)位控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)的(de)數(shu)(shu)控(kong)(kong)機(ji)(ji)床(chuang)(如數(shu)(shu)控(kong)(kong)鉆床(chuang)、數(shu)(shu)控(kong)(kong)鏜床(chuang)、加(jia)工(gong)中(zhong)心等(deng))。

工序集中

數控機床一般帶(dai)有可以自動換刀(dao)的刀(dao)架(jia)、刀(dao)庫,換刀(dao)過(guo)程(cheng)由程(cheng)序(xu)控制自動進行,因此,工(gong)序(xu)比較集(ji)(ji)中(zhong)。工(gong)序(xu)集(ji)(ji)中(zhong)帶(dai)來巨大的經濟效益(yi):

⑴減少(shao)機床占地面積,節約廠(chang)房。

⑵減少或沒(mei)有中(zhong)間(jian)(jian)環節(jie)(如(ru)半成品(pin)的(de)中(zhong)間(jian)(jian)檢測、暫存搬運(yun)等),既(ji)省時間(jian)(jian)又(you)省人(ren)力。

自動化

數(shu)控機床加工時(shi),不(bu)需人工控制刀(dao)具,自動化(hua)程度高。帶(dai)來的好處很明顯(xian)。

⑴對操作工人(ren)的要求降低:

一(yi)(yi)個普(pu)通(tong)(tong)機(ji)(ji)床的(de)(de)高效工(gong)(gong),不是(shi)短時(shi)間內可(ke)以培養的(de)(de),而一(yi)(yi)個不需編程的(de)(de)數(shu)(shu)(shu)控工(gong)(gong)培養時(shi)間極短(如數(shu)(shu)(shu)控車工(gong)(gong)需要(yao)(yao)一(yi)(yi)周即可(ke),還會(hui)編寫簡(jian)單(dan)的(de)(de)加(jia)(jia)工(gong)(gong)程序)。并且(qie),數(shu)(shu)(shu)控工(gong)(gong)在數(shu)(shu)(shu)控機(ji)(ji)床上加(jia)(jia)工(gong)(gong)出的(de)(de)零(ling)件比(bi)普(pu)通(tong)(tong)工(gong)(gong)在傳統機(ji)(ji)床上加(jia)(jia)工(gong)(gong)的(de)(de)零(ling)件精度(du)要(yao)(yao)高,時(shi)間要(yao)(yao)省。⑵降(jiang)低了工(gong)(gong)人的(de)(de)勞動強度(du):數(shu)(shu)(shu)控工(gong)(gong)人在加(jia)(jia)工(gong)(gong)過程中,大部分時(shi)間被排斥在加(jia)(jia)工(gong)(gong)過程之外,非常省力。

⑶產品質(zhi)量穩定:數控機(ji)床的(de)加工自動化,免(mian)除了普通機(ji)床上工人(ren)的(de)疲(pi)勞、粗(cu)心、估計等人(ren)為誤差,提(ti)高了產品的(de)一(yi)致性。

⑷加(jia)工效率高:數控機床的(de)自動(dong)換刀等使加(jia)工過程緊湊,提高了(le)勞動(dong)生(sheng)產(chan)率。

柔性化高

傳統的(de)通用(yong)機(ji)床(chuang),雖然柔(rou)(rou)性(xing)好,但(dan)效率低(di)下;而傳統的(de)專機(ji),雖然效率很高,但(dan)對零件的(de)適(shi)應(ying)性(xing)很差,剛性(xing)大,柔(rou)(rou)性(xing)差,很難適(shi)應(ying)市場經(jing)濟下的(de)激烈(lie)競(jing)爭(zheng)帶來的(de)產品頻繁(fan)改(gai)型。只(zhi)要改(gai)變程序,就可以(yi)在數控機(ji)床(chuang)上(shang)加工新的(de)零件,且(qie)又(you)能(neng)自動化操作,柔(rou)(rou)性(xing)好,效率高,因此(ci)數控機(ji)床(chuang)能(neng)很好適(shi)應(ying)市場競(jing)爭(zheng)。

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At the beginning of CNC machine tools, aircraft parts with complex surfaces were selected as processing objects to solve the key problems that ordinary machining methods are difficult to solve. A major feature of NC machining is the use of perforated tape(or tape) control machine tools for automatic processing. Due to the different characteristics of aircraft, rockets and engine parts: zero aircraft and rockets, large components, and complex surfaces; Engine zero, small component size, high precision. Therefore, the CNC machine tools used by the aircraft, Rocket manufacturing departments and engine manufacturing departments are different. In aircraft and rocket manufacturing, large-scale CNC milling machines with continuous control are used, while in engine manufacturing, CNC machine tools with continuous control are also used(such as CNC drilling machines, CNC boring machines, and machining centers).
Process concentration
CNC machine tools are generally equipped with knives and tool libraries that can be automatically changed. The process of changing knives is automatically controlled by the program. Therefore, the process is relatively concentrated. Process concentration brings great economic benefits:
(1) Reduce the area of machine tools and save factories.
(2) The reduction or absence of intermediate links(such as intermediate testing of semi-finished products, temporary storage and handling, etc.) saves both time and manpower.
automation
CNC machine tool processing, no manual control tool, high degree of automation. The benefits are obvious.
(1) Reduced requirements for operators:
The efficient work of an ordinary machine tool can not be cultivated in a short period of time, and the training time of a CNC worker who does not require programming is extremely short(for example, a CNC driver needs a week, and a simple processing program is also written). Moreover, the parts processed by CNC workers on CNC machine tools are more accurate than those processed by ordinary workers on traditional machine tools, and the time must be saved. (2) Reduced labor intensity of workers: CNC workers in the processing process, most of the time is excluded from the processing process, very labor-saving.
(3) Product quality stability: The automation of NC machine tools avoids the fatigue, carelessness, and human error of ordinary machine tools, and improves product consistency.
(4) High efficiency of machining: The automatic changing knife of CNC machine tool makes the processing process compact and improves labor productivity.
Flexible and high
Traditional universal machine tools, although flexible, but inefficient; Although the efficiency of the traditional special plane is very high, the adaptability to the parts is poor, the rigidity is large, and the flexibility is poor. It is difficult to adapt to the frequent modification of products brought about by fierce competition under the market economy. As long as the program is changed, new parts can be processed on the CNC machine tool, and it can be automated, flexible, and efficient. Therefore, the CNC machine tool can adapt well to market competition.