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壹(yi)看(kan)就知曉(xiao)HUBNER編(bian)碼(ma)器TDP0.2LT-4+OG9E200
壹看(kan)就知曉(xiao)HUBNER編(bian)碼(ma)器TDP0.2LT-4+OG9E200
機(ji)械制造(zao)可(ke)應用於建(jian)築(zhu)工(gong)程(cheng)、電(dian)氣(qi)工(gong)程(cheng)、紡(fang)織(zhi)業以(yi)及運(yun)輸(shu)業(ye)等,以(yi)提供(gong)精(jing)良(liang)的(de)機(ji)械設備(bei)、器具等,在制造(zao)過(guo)程(cheng)中(zhong)應(ying)用數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)能(neng)夠(gou)進(jin)壹(yi)步的加(jia)工(gong)與(yu)改(gai)善,使(shi)得(de)器具制造(zao)周(zhou)期(qi)有(you)效(xiao)縮短(duan),提(ti)高工(gong)作(zuo)效(xiao)率(lv),而且還能(neng)延(yan)長切削(xue)刀具的(de)使(shi)用壽命(ming),以(yi)避免成(cheng)本(ben)的損失。
關(guan)鍵詞:數控(kong);高(gao)速切削加(jia)工(gong)技術(shu);機(ji)械制造(zao)
0引言(yan)
我(wo)國(guo)經(jing)濟的發(fa)展(zhan)離不開(kai)工(gong)業(ye)技術(shu)的支持(chi),而(er)國(guo)家的(de)經(jing)濟發(fa)展(zhan)也推動(dong)了(le)生產技術(shu)發(fa)展(zhan),提升數控(kong)機(ji)床(chuang)技術(shu)的水(shui)平(ping)。機(ji)械制造(zao)是機(ji)械廠(chang)家(jia)根據(ju)企(qi)業(ye)的(de)要(yao)求(qiu)制作(zuo)相(xiang)應(ying)成(cheng)品的工(gong)業(ye)部門(men),例(li)如(ru)機(ji)床(chuang)、發(fa)動(dong)機(ji)以(yi)及汽(qi)車等機(ji)械產品,也可以(yi)制作(zuo)組件(jian)或(huo)零(ling)件(jian),其(qi)主要(yao)將原(yuan)材料(liao)制作(zuo)成(cheng)企(qi)業(ye)或(huo)用戶(hu)需求的成品,需經(jing)過編(bian)制生產計(ji)劃(hua)、材(cai)料(liao)準(zhun)備(bei)、毛坯(pi)鑄造(zao)、零(ling)件(jian)切(qie)削加(jia)工(gong)、組件(jian)、調(tiao)試(shi)檢驗(yan)、刷(shua)漆(qi)、入(ru)庫以(yi)及運(yun)輸(shu)等過程(cheng),其(qi)中(zhong)切(qie)削(xue)加(jia)工(gong)是機(ji)械制造(zao)重要步(bu)驟(zhou),決定著零(ling)件(jian)的(de)質量以(yi)及成(cheng)品(pin)的(de)質(zhi)量,同(tong)時還會(hui)影(ying)響(xiang)著生產效(xiao)率(lv)與成本消(xiao)耗[1-2]。由於(yu)傳(chuan)統的(de)切削(xue)技術(shu)在當(dang)下(xia)生產工(gong)業(ye)中(zhong)較(jiao)為(wei)落後,從而(er)產生新的切削(xue)技術(shu)———高速切削加(jia)工(gong)技術(shu),其(qi)在(zai)數控(kong)機(ji)床(chuang)中(zhong)進(jin)行切削加(jia)工(gong),可(ke)有(you)效(xiao)提(ti)高生產率,還可(ke)保證加(jia)工(gong)質(zhi)量(liang),有(you)利於促進(jin)機(ji)械制造(zao)工(gong)業(ye)長遠發(fa)展(zhan)[3]。
1數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)的現(xian)狀
現(xian)階(jie)段(duan),隨(sui)著科(ke)學技術(shu)的發(fa)展(zhan),數控(kong)機(ji)床(chuang)技術(shu)水(shui)平(ping)得(de)到質(zhi)的飛躍(yue),使(shi)得(de)機(ji)械制造(zao)工(gong)業(ye)傳(chuan)統的(de)組合機(ji)床(chuang)技術(shu)無法(fa)滿足(zu)工(gong)業(ye)發(fa)展(zhan)的需求,從而逐漸(jian)被(bei)替(ti)代(dai)[4]。相比之下(xia),數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)是壹種制造(zao)技術(shu),其(qi)不(bu)僅消耗低、切(qie)削速度快(kuai)、性(xing)能(neng)高(gao),而且能(neng)夠(gou)大(da)幅度降(jiang)低切(qie)削振(zhen)動(dong)、留(liu)於工(gong)件(jian)的(de)切削熱(re)。常(chang)規的(de)切削(xue)技術(shu)切削(xue)力較(jiao)低,從(cong)而降低生產效(xiao)率(lv),針對加(jia)工(gong)剛(gang)性(xing)較差的金(jin)屬零(ling)件(jian),可(ke)導(dao)致加(jia)工(gong)變(bian)形(xing),損失加(jia)工(gong)成(cheng)本(ben),而(er)通(tong)過(guo)使(shi)用高速切削加(jia)工(gong)技術(shu)可有(you)效(xiao)解(jie)決備(bei)受困(kun)擾的問(wen)題(ti),而且(qie)能(neng)夠(gou)提高(gao)切(qie)削(xue)速度與(yu)進(jin)給(gei)速度,同(tong)時也可高速排除切(qie)屑(xie),減少(shao)工(gong)件(jian)熱(re)應力變(bian)形(xing)發(fa)生情況(kuang),從(cong)而(er)有(you)利於增加(jia)薄壁(bi)零(ling)件(jian)切(qie)削加(jia)工(gong)的(de)可(ke)能(neng)性(xing),逐漸(jian)減少(shao)機(ji)械制造(zao)切(qie)削加(jia)工(gong)的(de)局(ju)限性(xing),這(zhe)給機(ji)械制造(zao)工(gong)業(ye)部門(men)帶(dai)來(lai)廣闊(kuo)的市場(chang)發(fa)展(zhan)前(qian)景(jing)[5-6]。
2數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)的優(you)勢(shi)
2.1簡化加(jia)工(gong)工(gong)序(xu)
相(xiang)對於傳(chuan)統切(qie)削技術(shu)來(lai)說,需要在淬(cui)火(huo)的條(tiao)件(jian)下(xia)進(jin)行手(shou)工(gong)修(xiu)整(zheng),從(cong)而修得成品(pin),而(er)采用數控(kong)高(gao)速切削技術(shu)可通(tong)過(guo)直(zhi)徑(jing)小的道具進(jin)行細(xi)節加(jia)工(gong),減少(shao)切削(xue)量,同(tong)時也不會(hui)出(chu)現表面(mian)硬化的情況(kuang),從(cong)而(er)減少(shao)手(shou)工(gong)修(xiu)整(zheng)工(gong)序(xu),節省(sheng)大(da)部分機(ji)械加(jia)工(gong)的(de)工(gong)序(xu),因(yin)此縮短(duan)成(cheng)品的(de)生產周期(qi)[7]。
2.2提(ti)高加(jia)工(gong)技術(shu)精(jing)密(mi)度
數控(kong)高(gao)速切削技術(shu)不但能(neng)夠(gou)提高(gao)速度,而(er)且(qie)在技術(shu)上(shang)具有(you)明顯的(de)優(you)勢(shi)。數控(kong)高(gao)速切削技術(shu)整體(ti)系(xi)統可(ke)提高(gao)成(cheng)品或(huo)零(ling)件(jian)密(mi)度確率(lv),同(tong)時刀具重復定位可有利(li)於(yu)多次(ci)進(jin)行成品修(xiu)復(fu),還可(ke)延(yan)長使(shi)用壽命(ming);除此(ci)之外,在(zai)汽(qi)車模(mo)具制造(zao)中(zhong)采用原(yuan)NC程(cheng)序(xu),不(bu)需要再次(ci)編(bian)程(cheng),都可(ke)達到確無(wu)誤(wu)的(de)效(xiao)果(guo)。由此可知,不(bu)管加(jia)工(gong)過(guo)程(cheng)是處(chu)於動(dong)態(tai)還是靜(jing)態,使(shi)用該(gai)技術(shu)都能(neng)夠(gou)穩(wen)定協(xie)調工(gong)作(zuo),以(yi)達到高(gao)速高精(jing)度的(de)加(jia)工(gong)水(shui)平(ping)。因(yin)汽車覆蓋件(jian)模(mo)具加(jia)工(gong)尺寸較(jiao)大(da),而且3D型面(mian)結構(gou)復(fu)雜(za),所以(yi)需要保證加(jia)工(gong)精(jing)度達到高(gao)水(shui)平(ping),從(cong)而增加(jia)切(qie)削(xue)量。針對以(yi)上(shang)情況(kuang),采(cai)用數控(kong)高(gao)速切削加(jia)工(gong)技術(shu),可有(you)效(xiao)提(ti)高生產效(xiao)率(lv)與成品精(jing)密(mi)度。例(li)如(ru),以(yi)汽車發(fa)動(dong)機(ji)前(qian)罩(zhao)翻邊(bian)模(mo)具的(de)數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)的應(ying)用情況(kuang):它(ta)的(de)工(gong)件(jian)材(cai)料(liao)為(wei)CH-1,外形(xing)尺寸為(wei)2000mm×1400mm×400mm,工(gong)件(jian)硬度為(wei)HB330。因此(ci),采用塗(tu)層(ceng)硬質(zhi)合金(jin)刀具材(cai)料(liao)進(jin)行加(jia)工(gong),保證表面(mian)加(jia)工(gong)粗(cu)糙(cao)程(cheng)度約(yue)1μm,時間(jian)控(kong)制24h左右,無(wu)需給予(yu)手(shou)工(gong)研(yan)磨(mo),僅僅對其(qi)進(jin)行油(you)石拋光即(ji)可(ke);其(qi)次(ci),再(zai)配(pei)合鉗(qian)工(gong)修(xiu)配(pei)(3h),共(gong)花27h。與(yu)傳(chuan)統切(qie)削加(jia)工(gong)操(cao)作(zuo)時間(jian)比較(jiao),其(qi)減少(shao)了(le)83%左右。
2.3適(shi)用於遇熱(re)易(yi)變(bian)性(xing)的零(ling)件(jian)
在(zai)切削加(jia)工(gong)過(guo)程(cheng)中(zhong),切(qie)削(xue)熱會(hui)傳(chuan)遞給工(gong)作(zuo)臺(tai),而(er)針(zhen)對遇熱(re)易(yi)變(bian)性(xing)的零(ling)件(jian)加(jia)工(gong)的(de)難(nan)度較(jiao)大(da),極易(yi)出(chu)現變(bian)形(xing),而數控(kong)高(gao)速切削技術(shu)能(neng)保持工(gong)件(jian)的(de)冷態狀(zhuang)態,進(jin)而(er)能(neng)夠(gou)對熱(re)變(bian)形(xing)的零(ling)件(jian)進(jin)行加(jia)工(gong),且(qie)補償(chang)進(jin)度*,還可(ke)解(jie)決加(jia)工(gong)誤(wu)差的問(wen)題(ti),節省(sheng)機(ji)械制造(zao)業(ye)的經(jing)濟成本(ben)[8]。
3數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)在機(ji)械制造(zao)中(zhong)的應用
3.1在刀具、刀柄(bing)加(jia)工(gong)中(zhong)的(de)技術(shu)應用
因數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)系統性(xing)強(qiang),且(qie)較為(wei)復雜(za)多樣,因(yin)此對(dui)於(yu)刀具的(de)制作(zuo)要(yao)求(qiu)更高,在加(jia)工(gong)與(yu)制作(zuo)過(guo)程(cheng)中(zhong),主要(yao)對刀具、刀柄(bing)的(de)裝夾重復定位精(jing)度、幾何精(jing)度給(gei)予(yu)較高(gao)重視(shi)。在(zai)制造(zao)過(guo)程(cheng)中(zhong),離(li)心(xin)力、強(qiang)烈(lie)振(zhen)動(dong)數可(ke)影(ying)響(xiang)數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)系統,以(yi)提高成(cheng)品加(jia)工(gong)的(de)高(gao)速動(dong)平(ping)衡、剛度要(yao)求(qiu),還有(you)效(xiao)保證刀具與(yu)刀柄(bing)的(de)安全(quan)性(xing)與質(zhi)量。在高速加(jia)工(gong)過(guo)程(cheng)中(zhong),刀柄(bing)材(cai)料(liao)的要(yao)求也可影(ying)響(xiang)加(jia)工(gong)的(de)效(xiao)率(lv),因此需要根據(ju)實(shi)際情況(kuang)進(jin)行選(xuan)擇。例(li)如(ru)HSK高速刀柄(bing)較(jiao)為(wei)適合高(gao)速加(jia)工(gong)應(ying)用,其(qi)是壹種具有(you)熱脹冷縮緊固式特(te)性(xing)的高(gao)速刀柄(bing),可(ke)適應高速切削環(huan)節。除此(ci)之外,在(zai)高(gao)速加(jia)工(gong)過(guo)程(cheng)中(zhong)刀具需要承(cheng)受高溫、振(zhen)動(dong)、摩(mo)擦、高壓(ya)、沖擊(ji)等外界(jie)因素,所(suo)以(yi)需要結合刀具經(jing)濟性(xing)能(neng)、工(gong)藝(yi)性(xing)能(neng)進(jin)行高速加(jia)工(gong)。
3.2在(zai)銑(xi)削(xue)加(jia)工(gong)機(ji)床(chuang)中(zhong)的(de)技術(shu)應用
目前(qian),在(zai)配(pei)有(you)微(wei)電(dian)子(zi)技術(shu)、新材料(liao)結構(gou)基(ji)礎技術(shu)、CNC技術(shu)等條(tiao)件(jian)下(xia)開(kai)展機(ji)床(chuang)高(gao)速切削加(jia)工(gong),從(cong)而(er)可(ke)廣泛(fan)應用於銑(xi)削加(jia)工(gong)機(ji)床(chuang)中(zhong)。由(you)於(yu)機(ji)床(chuang)系(xi)統較(jiao)為(wei)復雜(za),且要求較高,需要重視(shi)應(ying)用方式,以(yi)充分利用與結合機(ji)床(chuang)高(gao)速切削加(jia)工(gong)技術(shu)。先(xian),應提(ti)高機(ji)床(chuang)系(xi)統的(de)剛性(xing)要求(qiu),在銑削機(ji)床(chuang)加(jia)工(gong)制造(zao)過(guo)程(cheng)中(zhong),為(wei)大(da)限度發(fa)揮高(gao)速切削加(jia)工(gong)技術(shu),需要提供(gong)配(pei)合高(gao)速供(gong)給(gei)驅(qu)動(dong)器,且快(kuai)進(jin)速度要(yao)達到40m/min,銑(xi)削系統提(ti)供(gong)0.3m/s的(de)減速度、0.4m/s的(de)加(jia)速度,3D輪(lun)廓加(jia)工(gong)速度約(yue)10m/min。其(qi)次(ci),還要(yao)保證刀柄(bing)和(he)主軸(zhou)的剛性(xing)能(neng)夠(gou)符(fu)合標(biao)準(zhun),所以(yi)保證系(xi)統轉(zhuan)速為(wei)10000-50000r/min,為(wei)確保主軸(zhou)與刀具之間(jian)的軸(zhou)向(xiang)間(jian)隙能(neng)夠(gou)有效(xiao)控(kong)制在0.00762mm範(fan)圍(wei)內(nei),應(ying)讓(rang)主軸(zhou)壓(ya)縮空(kong)氣(qi),冷卻(que)系(xi)統。後,還要(yao)保證技工(gong)工(gong)藝(yi)可(ke)靠(kao)性(xing),在使(shi)刀具壽(shou)命與(yu)切削(xue)條(tiao)件(jian)相(xiang)互融合中(zhong),應提(ti)高優(you)質(zhi)的(de)工(gong)藝(yi)模(mo)型質(zhi)量(liang),從而(er)有效(xiao)提(ti)高機(ji)床(chuang)的(de)利(li)用率,即(ji)便(bian)是無人操(cao)作(zuo)狀(zhuang)態(tai)下(xia),依(yi)然保證加(jia)工(gong)技術(shu)具有(you)較高(gao)的安全(quan)可靠(kao)性(xing)。
3.3高速數控(kong)切(qie)削加(jia)工(gong)技術(shu)的數控(kong)編(bian)程(cheng)策略
高速數控(kong)切(qie)削加(jia)工(gong)技術(shu)不僅僅是提高常(chang)規加(jia)工(gong)進(jin)給(gei)與轉(zhuan)速,其(qi)還有(you)較為(wei)復雜(za)與特(te)殊的(de)控(kong)制性(xing)能(neng)。特(te)別是在數控(kong)編(bian)程(cheng)過(guo)程(cheng)中(zhong),要(yao)嚴(yan)格(ge)確保刀具的(de)準(zhun)度與(yu)安全(quan)性(xing),同(tong)時也要保證機(ji)械制造(zao)表面(mian)質量(liang)與(yu)精(jing)度,因(yin)此(ci)需要改(gai)善該(gai)技術(shu)的編(bian)程(cheng)策略。在數控(kong)高(gao)速切削加(jia)工(gong)過(guo)程(cheng)中(zhong),為(wei)保證加(jia)工(gong)的(de)安全(quan)性(xing)與質(zhi)量水(shui)準(zhun),不僅要確保刀具與(yu)機(ji)床(chuang)不(bu)過(guo)載(zai),還要(yao)限制工(gong)件(jian)、刀具與(yu)夾具之間(jian)碰撞(zhuang)與(yu)幹涉,由(you)於(yu)機(ji)床(chuang)與(yu)刀具之間(jian)出(chu)現過載,可高(gao)度增加(jia)機(ji)械制造(zao)加(jia)工(gong)成(cheng)本(ben),而(er)且還會(hui)影(ying)響(xiang)成品的(de)質(zhi)量與(yu)確度,所(suo)以(yi)需要著手(shou)於(yu)以(yi)上(shang)因(yin)素進(jin)行改(gai)變(bian)數控(kong)編(bian)程(cheng)。此(ci)外(wai),在(zai)編(bian)程(cheng)過(guo)程(cheng)中(zhong)數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)過程(cheng)的(de)主要(yao)特(te)征(zheng)是恒(heng)定切削載荷,為(wei)確保加(jia)工(gong)技術(shu)的質(zhi)量,要(yao)嚴格(ge)觀(guan)察(cha)與(yu)控(kong)制金(jin)屬切削(xue)層(ceng)厚(hou)度,並(bing)保持適(shi)中(zhong)恒(heng)定,與仿(fang)形(xing)加(jia)工(gong)比(bi)較(jiao),分層(ceng)加(jia)工(gong)可(ke)有(you)助(zhu)於提高材料(liao)去(qu)除量(liang)的(de)有效(xiao)恒(heng)定效(xiao)果(guo);除此(ci)之外,刀具切(qie)入(ru)工(gong)件(jian)方(fang)式,要選(xuan)擇平滑的(de)刀具;其(qi)次(ci)要(yao)確保刀具軌(gui)跡能(neng)夠(gou)平滑過(guo)渡,不能(neng)夠(gou)出(chu)現直接(jie)過(guo)濾(lv)的情況(kuang)。加(jia)工(gong)工(gong)件(jian)精(jing)度也是衡量切削(xue)技術(shu)水(shui)平(ping)的(de)標準(zhun),在數控(kong)高(gao)速切削加(jia)工(gong)過(guo)程(cheng)中(zhong)密(mi)切(qie)監察(cha)加(jia)工(gong)工(gong)件(jian)確度與(yu)質(zhi)量,大(da)限度減少(shao)刀具的(de)切入(ru)次(ci)數,同(tong)時走刀方式要選(xuan)擇合理(li)的螺(luo)旋軌(gui)跡。合理(li)控(kong)制切削(xue)進(jin)給(gei)量,可減少(shao)切削(xue)振(zhen)動(dong)情況(kuang)。若進(jin)給(gei)量減少(shao),可造(zao)成(cheng)切削不穩(wen)定,從而導(dao)致振(zhen)動(dong)。因(yin)此,必須保持平(ping)衡(heng)狀態,從(cong)而能(neng)夠(gou)穩(wen)定提升加(jia)工(gong)表面(mian)質量(liang)。
4數控(kong)高(gao)速切削加(jia)工(gong)技術(shu)的影(ying)響(xiang)因素
4.1工(gong)件(jian)材(cai)料(liao)因素影(ying)響(xiang)
在冶煉(lian)環(huan)節中(zhong),工(gong)件(jian)材(cai)料(liao)若出(chu)現雜(za)質,會(hui)影(ying)響(xiang)材料(liao)硬質(zhi)點,使(shi)切(qie)削(xue)過(guo)程(cheng)受(shou)到壹(yi)定的影(ying)響(xiang),若振(zhen)動(dong)較(jiao)為(wei)強(qiang)烈(lie),可致使(shi)刀刃崩損,造(zao)成(cheng)壹定的危險(xian)。在熱(re)處(chu)理環(huan)節中(zhong),還會(hui)出(chu)現不同(tong)部位(wei)硬度問(wen)題(ti),若粗加(jia)工(gong)後,再次(ci)經(jing)淬(cui)火(huo)進(jin)行精(jing)加(jia)工(gong),可(ke)導(dao)致加(jia)工(gong)工(gong)件(jian)尺寸變(bian)形(xing),從而(er)直接(jie)影(ying)響(xiang)其(qi)精(jing)度。因(yin)此(ci),在高(gao)速切削加(jia)工(gong)技術(shu)中需要根據(ju)實(shi)際情況(kuang)與(yu)條(tiao)件(jian),選(xuan)擇合理(li)的工(gong)件(jian)材(cai)料(liao),以(yi)提高切(qie)削加(jia)工(gong)技術(shu)的質(zhi)量與(yu)效(xiao)率(lv)。
4.2刀具因(yin)素影(ying)響(xiang)
刀具系(xi)統應(ying)用容易(yi)影(ying)響(xiang)高速切削加(jia)工(gong)技術(shu),若刀具系(xi)統的(de)離心(xin)力較(jiao)大(da),導(dao)致加(jia)工(gong)過(guo)程(cheng)中(zhong)會(hui)出(chu)現較強(qiang)烈(lie)的振(zhen)動(dong),可(ke)降低刀具的(de)使(shi)用質量(liang),因此(ci)需提高幾何精(jing)度要(yao)求(qiu),以(yi)保證裝(zhuang)夾重復定位的精(jing)度。在(zai)數控(kong)加(jia)工(gong)高(gao)速切削中,傳(chuan)統7:24錐(zhui)度刀柄(bing)系(xi)統有(you)剛性(xing)達不到常(chang)規標(biao)準(zhun),所以(yi)重復定位精(jing)度較(jiao)差,還伴(ban)有其(qi)他不穩(wen)定性(xing)問(wen)題(ti),不建(jian)議(yi)應用於高(gao)速切削中。現如(ru)今,雙(shuang)面(mian)接(jie)觸空(kong)心(xin)短錐(zhui)刀柄(bing)HSK是能(neng)夠(gou)適應(ying)高(gao)速切削應用的常(chang)用刀具。
5結語
在(zai)機(ji)械制造(zao)過(guo)程(cheng)中(zhong),數控(kong)高(gao)速切削技術(shu)應用提高(gao)加(jia)工(gong)效(xiao)率(lv),增加(jia)毛(mao)坯(pi)材料(liao)的去(qu)除率(lv),縮短(duan)切(qie)削時間(jian),從而(er)有(you)效(xiao)縮短(duan)產品的(de)制造(zao)周(zhou)期(qi),在(zai)產品的(de)市場(chang)競(jing)爭力(li)占(zhan)據重要優(you)勢(shi)。同(tong)時,該(gai)技術(shu)具有(you)優(you)點,也必然(ran)存在壹(yi)定的不足(zu)之處(chu),其(qi)可(ke)受(shou)到工(gong)藝(yi)材(cai)料(liao)高速切割的(de)適用性(xing)、數控(kong)編(bian)程(cheng)系(xi)統的(de)要求(qiu)以(yi)及機(ji)床(chuang)的(de)要(yao)求(qiu)的(de)局限性(xing)。