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O0001
M03S400T0101
G0X210Z3
G90X110Z2F150
Z1
Z0.5
Z0
G0X300Z150
M03S500T0202
G0X114Z1
G71U1R1
G71P1Q2U-0.5W0.1F180
N1G01X125.5F150
Z0
X123.5W-1
Z-6.3
X120W-1
Z-24
N2U-1
G0Z100
X100
M30
建模步驟:
1、繪制草圖
2、回轉(zhuǎn)得到實(shí)體
3、繪制卡槽
4、陣列60個(gè)卡槽
5、繪制螺旋線
6、繪制截面
7、掃掠
8、修剪旋入口和旋出口
無(wú)錫職業(yè)技術(shù)學(xué)院
畢業(yè)設(shè)計(jì)(論文)
論文題目:四爪單動(dòng)卡盤(k72200)絲杠工藝設(shè)計(jì)與程序編制
所屬系部:
指導(dǎo)老師: 職 稱:
學(xué)生姓名: 班級(jí)、學(xué)號(hào):
專 業(yè):
2014年4月10 日
II
四爪單動(dòng)卡盤(k72200)絲杠工藝設(shè)計(jì)與程序編制
摘要:隨著科技的不斷發(fā)展,數(shù)控技術(shù)在企業(yè)中發(fā)揮越來(lái)越重要的作用。本設(shè)計(jì)通過(guò)對(duì)數(shù)控加工的工藝特點(diǎn)、加工零件工藝性等進(jìn)行分析,選擇正確的加工方法,設(shè)計(jì)合理的加工工藝過(guò)程,充分發(fā)揮數(shù)控加工的優(yōu)質(zhì)、高效、低成本的特點(diǎn)。設(shè)計(jì)說(shuō)明書以三爪自動(dòng)定心卡盤盤絲零件為例,根據(jù)被加工工件的材料、輪廓形狀、加工精度等選用合適的機(jī)床,制定加工方案,確定零件的加工順序,各工序所用刀具,夾具和切削用量等,編寫加工零件的程序。?
關(guān)鍵詞:工藝過(guò)程;加工方案;切削用量;編寫程序Four claws single-acting chuck (k72200) screw process design and programming
Abstract:With the continuous development of science and technology, numerical control technology is playing a more and more important role in the enterprise.This design through to the nc machining process characteristics, such as machining parts manufacturability analysis, to select the correct processing methods, design the reasonable machining process, give full play to the nc machining of the characteristics of high quality, high efficiency and low cost.Design specification to three jaw self centering chuck plate wire parts as an example, according to the shape of the material, the outline of the processed workpiece, choose suitable machine tools machining precision, processing scheme, determine the machining sequence of parts, each working procedure used tool, fixture and cutting dosages, writing program of machining parts..?
Key words :process;Processing scheme;Cutting parameter;Write a program
目 錄
摘要 I
Abstract II
一 ?零件的工藝分析 1
(一)零件的功用、結(jié)構(gòu)及特點(diǎn) 1
(二)主要加工表面及其要求 1
二 毛坯的選擇 2
(一)確定毛坯的類型,制造方法和尺寸度及其公差 2
(二)確定毛坯技術(shù)要求 2
三 基準(zhǔn)的選擇 2
四 ?擬定機(jī)械加工路線 3
(一)確定各表面的加工方法 3
(二)擬定加工路線 3
(三)工藝分析 3
五 機(jī)床的選擇及工藝裝備 3
(一)機(jī)床的選擇 3
(二)選擇刀具 4
(三)選擇量具 4
六?確定切削用量參數(shù) 4
(一)粗車端面 4
(二)粗車內(nèi)孔 4
(三)粗車外圓 5
(四)精車端面 5
(五)精車內(nèi)孔 5
(六)確定精車時(shí)的切削余量 5
七 三維圖的繪制及自動(dòng)編程參數(shù)設(shè)計(jì) 6
(一)三維圖的繪制 6
(二)自動(dòng)編程參數(shù)設(shè)置 10
八 程序的編制 14
(一)工序10、20程序 14
(二)工序30、40程序 15
(三)工序50程序 15
總 結(jié) 17
參考文獻(xiàn) 18
一 ?零件的工藝分析
(一)零件的功用、結(jié)構(gòu)及特點(diǎn)
? 三爪卡盤裝夾工件的原理是,利用卡盤扳手轉(zhuǎn)動(dòng)圓周上的三個(gè)傘齒中的任一個(gè)。從而帶動(dòng)盤絲平面螺紋轉(zhuǎn)動(dòng)并帶動(dòng)三個(gè)卡爪一齊移動(dòng),起到自定心裝夾工件作用,在工作中承受一定的載荷,因此要求其有一定的強(qiáng)度和耐磨性。
(二)主要加工表面及其要求
?①內(nèi)孔
?孔徑為Φ120mm的孔是定位用的,表面粗糙度Ra=3.2um,倒角人C1,公差等級(jí)為IT8~12,位置度要求為0.01mm,圓柱度為0.008mm,垂直端面度為0.01mm,基準(zhǔn)為A,要求較高需要合理的安排加工工藝。
②外圓
表面尺寸要求為Φ203mmmm,公差等級(jí)為IT8~12,外圓表面素線以孔軸為基準(zhǔn),無(wú)較高的要求。
③端面
外端面粗糙度Ra=3.2um,此加工面做為基準(zhǔn)面,平面度要求較高0.02mm
④平面螺紋
此平面螺紋由阿基米德螺旋線方程式構(gòu)成,r(θ)= a+ b(θ)
式中:
b—阿基米德螺旋線系數(shù),mm/°,表示每旋轉(zhuǎn)1度時(shí)極徑的增加(或減小)量;
θ—極角,單位為度,表示阿基米德螺旋線轉(zhuǎn)過(guò)的總度數(shù);
a—當(dāng)θ=0°時(shí)的極徑,mm。
利用卡盤扳手轉(zhuǎn)動(dòng)圓周上的三個(gè)傘齒中的任一個(gè)。從而帶動(dòng)盤絲平面螺紋轉(zhuǎn)動(dòng)并帶動(dòng)三個(gè)卡爪一齊移動(dòng),所以要求較高,端面垂直度為0.012mm
⑤斜齒輪
利用卡盤扳手轉(zhuǎn)動(dòng)圓周上的三個(gè)傘齒中的任一個(gè),斜齒輪也跟著轉(zhuǎn)動(dòng),從而平面螺紋也跟著動(dòng),進(jìn)而三爪也跟著動(dòng)。加工表面無(wú)較高要求。
二 毛坯的選擇
(一)確定毛坯的類型,制造方法和尺寸度及其公差
①該零件的材料為20Cr/20CrMnTi,設(shè)計(jì)要求生產(chǎn)類型為成批生產(chǎn),根據(jù)形狀,選用金屬模砂型機(jī)器鑄造。
②選擇零件的一端面作為分型面鑄造出帶孔的圓棒料。
③由零件圖技術(shù)要求知該零件精度要求較高,毛坯為精密的鑄件,鑄件尺寸公差為CT9加工余量等級(jí)按CT9-MA-H/G級(jí)。各表面單邊余量3.0mm。
(二)確定毛坯技術(shù)要求
①鑄件不應(yīng)有裂紋、砂眼、和局部縮松、氣孔及夾渣等缺陷,鑄件表面應(yīng)清除毛刺同、結(jié)瘤和粘砂等。
②球化退火處理硬度為207~229HBW,以降低硬度,改善切削加工性,并為淬火作好組織上的準(zhǔn)備,材料為20Cr/20CrMnTi。
③未注倒角0.5x45 ,其余粗糙度Ra=6.3um。
三 基準(zhǔn)的選擇
由零件圖中的技術(shù)要求可知該零件的尺寸較多是以平面螺紋端面為設(shè)計(jì)基準(zhǔn),且圖中內(nèi)孔表面和平面螺紋尺寸精度要求較高,根據(jù)粗精基準(zhǔn)選擇原則和基準(zhǔn)重合統(tǒng)一原則,確定各表面的基準(zhǔn)如下表所示:
序號(hào)
加工部位
?? 基準(zhǔn)選擇
1
孔及其平面螺紋端面
外圓輪廓及端面(粗基準(zhǔn))
2
外圓輪廓
內(nèi)孔中心線和端面A
3
端面和斜齒輪
內(nèi)孔中心線和端面A
?四 ?擬定機(jī)械加工路線
(一)確定各表面的加工方法
根據(jù)各加工表面的加工精度和表面粗糙度要求,選定如下加工方法:
端面加工為車削;
孔的加工為車削;
外圓加工為車削;
平面螺紋加工為銑削;
斜齒輪加工為滾齒。
(二)擬定加工路線
???? 加工方案如下表:
工序號(hào)
內(nèi)容
設(shè)備
10
夾持毛坯外圓,粗車平面螺紋端面和內(nèi)孔
臥式車床
20
精車平面螺紋端面和內(nèi)孔
臥式車床
30
掉頭崩夾持內(nèi)孔Φ120mm,粗、精加工外圓
臥式車床
40
粗、精加工端面
臥式車床
50
銑平面螺紋
立式銑床
60
滾斜齒輪
滾齒機(jī)
70
清洗,去毛刺
?
80
檢驗(yàn)
?
(三)工藝分析
此工藝按工藝集中原則組織工序,許多工序可在同一機(jī)床上完成,減少了工件的裝夾次數(shù),易于保證加工面的質(zhì)量,需要的機(jī)床少,減少了工件在工序間的運(yùn)輸,減少輔助時(shí)間和準(zhǔn)備時(shí)間。
?
五 機(jī)床的選擇及工藝裝備
(一)機(jī)床的選擇
(1) 工序10、20、40
由于有些工序包括多個(gè)工步,該零件形狀較規(guī)則,為減少裝卸刀具次數(shù)和時(shí)間,保證工件質(zhì)量,選用CA6140型臥式車床比較合適。
?(2) 工序50
?根據(jù)工件的尺寸選用MVC850B立式銑床。
(3)工序60
根據(jù)工件的形狀選擇滾齒機(jī)
(二)選擇刀具
該零件特形表面,成批生產(chǎn),一般采用通用或標(biāo)準(zhǔn)刀具,臥式車床上粗車端面和外圓可選用90°外圓車刀,內(nèi)孔選用25方內(nèi)孔車刀,銑平面螺紋選用ED5mm立銑刀和ED3mm立銑刀,斜齒輪選擇滾齒刀。
(三)選擇量具
該零件屬批量生產(chǎn),一般采用通用量具。
(1)外圓和內(nèi)孔加工量具
外圓表面 公差值T=0.23mm,查表得計(jì)量器具不確定度允許值為 =.00018,查表得,所選用的計(jì)量器具達(dá)不到GB 3177—1997規(guī)定的 。則重新計(jì)算安全裕度A’, A’= =0.002
由于零件最大實(shí)體尺寸:203mm
則基驗(yàn)收極限尺寸: 由分析得應(yīng)選用0~250mm游標(biāo)卡尺
(2)端面量具
需要測(cè)量平行度,所以選用0-25mm的外徑千分尺
?六?確定切削用量參數(shù)
(一)粗車端面
(1)粗車端面
?步驟如下是:
①確定背吃刀量 :端面單邊總余量3mm,一次走刀加工1.0mm。
②確定進(jìn)給量f:根據(jù)表查得f=0.6~0.9mm/r;根據(jù)機(jī)床的橫向進(jìn)給量,取f=0.8mm/r。
③確定進(jìn)給量f:根據(jù) 表查得 =235,m=0.20, ?修正系數(shù) 刀具壽命選T=60min,故=72.2m/min
④確定機(jī)床主軸轉(zhuǎn)速n:根據(jù)表查得相近較小的機(jī)床轉(zhuǎn)速為n=420r/min,所以實(shí)際切削速度 =80m/min
(二)粗車內(nèi)孔
①確定背吃到量 :總加工余量為3.0mm,一次走刀加工1mm。
②確定進(jìn)給量f:根據(jù)表5-102查得f=0.6~0.9mm/r;根據(jù)機(jī)床的縱向進(jìn)給量,取f=0.81mm/r。
③確定切削速度 :根據(jù)表查得 =235,m=0.20, =0.15, =0.45,修正系數(shù) =0.87, =1.0, =0.8, =0.81, =1.0,刀具壽命T=60min,故 =55.98m/min
④確定機(jī)床主軸轉(zhuǎn)速n:
根據(jù)表查得相近較小的機(jī)床轉(zhuǎn)速為n=320r/min,所以實(shí)際切削速度 =54.26m/min
(三)粗車外圓
①背吃刀量的ap的選擇:查《簡(jiǎn)明機(jī)械加工工藝手冊(cè)》 可知A=(50-46)/2=2mm,單邊留0.5mm做精車余量,取粗車背吃刀量ap=1mm。
②確定進(jìn)給量f:查查《簡(jiǎn)明機(jī)械加工工藝手冊(cè)》 可知,f=0.4~0.5mm/r,根據(jù)機(jī)床說(shuō)明書,初步選定f=0.45mm/r.
③確定切削速度Vc:查查《簡(jiǎn)明機(jī)械加工工藝手冊(cè)》 可知,Vc=2.17~2.667m/s,考慮到進(jìn)給量較大取Vc=2m/s。
④確定主軸轉(zhuǎn)速n,由公式:n=1000v/πd=(1000×2)/(3.14×30)=5.31r/s
根據(jù)機(jī)床說(shuō)明書,取n=12.5r/s。此時(shí)切削速度為:Vc=πdn/1000=(3.14×30×12.5)/1000=1.18m/s
(四)精車端面
①確定背吃刀量 ,端面單邊剩余余量為1mm,二次走刀加工, =0.5mm。
②確定進(jìn)給量f:根據(jù)表查得f=0.6~0.9mm,查表5-5得f=0.61mm/r。
③確定切削速度 :根據(jù)表查得 修正系數(shù) =77.47m/min
④機(jī)床主軸轉(zhuǎn)速n:
根據(jù)表查得相近較小的機(jī)床轉(zhuǎn)速為n=250r/min,所以實(shí)際切削速度 =71.44m/min.
(五)精車內(nèi)孔
①確定背吃刀量 :側(cè)壁加工余量為0.5mm,一次走刀加工完成, =0.5mm.
② 確定進(jìn)給量f:根據(jù)表查得f=0.6~0.9mm/r,取f=0.5mm.
③確定切削速度 修正系 =0.87, =1.24, 刀具壽命選T=60min,故
④確定機(jī)床主軸轉(zhuǎn)速n:
根據(jù)表查得相近較小的機(jī)床轉(zhuǎn)速為n=250r/min,所以實(shí)際切削速度 =94.985 m/min
(六)確定精車時(shí)的切削余量
①確定背吃刀量ap 取ap=0.25mm。
②確定進(jìn)給速度f(wàn) 查《簡(jiǎn)明機(jī)械加工工藝手冊(cè)》,預(yù)估計(jì)切削速度VC>1.66m/s時(shí),查得f=0.25~0.39mm/r,根據(jù)機(jī)床說(shuō)明書,取f=0.30mm/r。
③確定切削速度VC與機(jī)床主軸轉(zhuǎn)速,可知VC=2.17~2.667m/s,根據(jù)機(jī)床說(shuō)明書,取VC=2.4m/s.
④按公式得主軸轉(zhuǎn)速:
n=(1000V)/πd=(1000×2.4)/(3.14×203)=0.822r/s。
按機(jī)床說(shuō)明書,取n=16.66r/s。按公式算得切削速度為:
VC=(π·d·n)/1000=(3.14×203×16.4)/1000=11.9m/s。
由于精車切削力較小,故一般不需校驗(yàn),最后選定精車切削用量為:ap=0.25mm,f=0.30mm/r,VC=2.39m/s,n=500r/min
七 三維圖的繪制及自動(dòng)編程參數(shù)設(shè)計(jì)
(一)三維圖的繪制
繪制回轉(zhuǎn)草圖
繪制斜齒輪草圖
拉伸草圖
在繪制如下草圖
拉伸上步驟畫的草圖
同理反面拉伸草圖
陣列特征
繪制平面螺紋截面線串
繪制界面線串后,進(jìn)行掃略
繪制一個(gè)曲面修建
同理修建另一頭
最后求和
(二)自動(dòng)編程參數(shù)設(shè)置
本零件的編程運(yùn)用UGNX6.0編制,首先繪制好零件實(shí)體圖后,如圖所示為UGNX6.0工作界面與零件實(shí)體圖。
(1)創(chuàng)建機(jī)床坐標(biāo)系,首先雙擊菜單欄里的,進(jìn)入安全設(shè)置選項(xiàng)里面設(shè)定安全平面30mm
圖4.12
(2)設(shè)計(jì)銑削幾何體,雙擊右邊導(dǎo)航器里的WORKPIECE,進(jìn)行設(shè)置加工工件與加工毛坯。毛坯建法:先將工件隱藏,在草圖上回轉(zhuǎn)草圖,再在編輯菜單里進(jìn)行互換顯示與隱藏。
(3)創(chuàng)建刀具
UG課程的時(shí)候,老師說(shuō)過(guò)做UG仿形加工有三個(gè)步驟:①用什么刀具加工;②確定對(duì)零件件加工方法;③選擇零件加工的操作命令。我現(xiàn)在創(chuàng)建操作平面立銑外輪廓,選擇Ф5的立銑刀,去除外部毛坯材料。如圖所示。
按照以上操作再創(chuàng)建其他刀具。最后建成直徑3mm的平底銑刀精加工
圖4.15 建立刀具
(4)創(chuàng)建刀具軌跡,上UG課程的時(shí)候,老師說(shuō)過(guò)做UG仿形加工有三個(gè)步驟:①用什么刀具加工;②對(duì)什么零件進(jìn)行加工;③怎么加工?,F(xiàn)在第三步如下圖所示。
A、粗加工,選擇型腔銑開粗
設(shè)置切削區(qū)域
設(shè)置切削模式,步距,每刀切削深度
設(shè)置非切削參數(shù)
設(shè)置主軸轉(zhuǎn)速和切削速度
刀具軌跡
2D仿真
同理在選擇ED3mm的立銑刀精加工
八 程序的編制
(一)工序10、20程序
順序號(hào)
程序內(nèi)容
程序說(shuō)明
O0001
程序名
N10
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循環(huán)車削粗加工
N40
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直線插補(bǔ)
N50
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直線插補(bǔ)
N60
Z0
倒角
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直線插補(bǔ)
N80
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直線插補(bǔ)
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倒角
N100
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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退刀
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退刀
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換刀
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
N210
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直線插補(bǔ)
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程序結(jié)束
(二)工序30、40程序
順序號(hào)
程序內(nèi)容
程序說(shuō)明
O0002
程序名
N10
M03S400T0101
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倒角
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直線插補(bǔ)
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直線插補(bǔ)
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倒角
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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直線插補(bǔ)
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退刀
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退刀
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G0X300
換刀
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Z100
直線插補(bǔ)
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M30
直線插補(bǔ)
(三)工序50程序
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總 結(jié)
通過(guò)此次畢業(yè)設(shè)計(jì),我們基本上掌握了零件的工藝過(guò)程的分析、工藝文件的編制,了解了一些機(jī)械制造技術(shù)基礎(chǔ)的知識(shí),切身體會(huì)到了從毛坯到成品的工藝過(guò)程,從而對(duì)于本課有一個(gè)較為清析的輪廓印像。學(xué)會(huì)了查相關(guān)手冊(cè)、選擇使用工藝裝備等等。
總的來(lái)說(shuō),這次課程設(shè)計(jì),使我們?cè)诨A(chǔ)理論知識(shí)的綜合運(yùn)用及正確解決實(shí)際問(wèn)題等方面得到了一次較好的訓(xùn)練,提高了我們的思考、解決問(wèn)題、創(chuàng)新設(shè)計(jì)的能力,為以后的工藝設(shè)計(jì)打下較好的基礎(chǔ)。
對(duì)于這門課程我們還只有一個(gè)初步的認(rèn)識(shí),所以請(qǐng)老師多多指正批評(píng)。如果要想更好的掌握這門課技術(shù),還需要我們進(jìn)一步的學(xué)習(xí)與實(shí)踐,在實(shí)際的工作中不斷的積累經(jīng)驗(yàn),這樣我們才能更好的學(xué)好這門技術(shù),更好地了解機(jī)械制造工業(yè),從而為以后的工作打下堅(jiān)固的基礎(chǔ)。
參考文獻(xiàn)
【1】王愛(ài)玲.現(xiàn)代數(shù)控機(jī)床實(shí)用操作技術(shù)[M].北京:國(guó)防工業(yè)出版社,2O05.
【2】金捷 劉小菡 主編. 機(jī)械制造技術(shù)與訓(xùn)練項(xiàng)目.上海:復(fù)旦大學(xué)出版社,2010
【3】唐應(yīng)謙.?dāng)?shù)控加工工藝學(xué)[M].北京:中國(guó)勞動(dòng)社會(huì)保障出版社,2000.
【4】熊熙.?dāng)?shù)控加工實(shí)訓(xùn)教程[M].北京:化學(xué)工業(yè)出版社,2003.
【5】劉立.?dāng)?shù)控車床編程與操作[M].北京:北京理工大學(xué)出版社,2006.
【6】楊仲岡.數(shù)控加工技術(shù).北京:機(jī)械工業(yè)出版社,2001.
【7】于華.數(shù)控機(jī)床的編程及實(shí)例.北京:機(jī)械工業(yè)出版社,1996.
【8】王先逵.機(jī)械制造工藝學(xué).北京:機(jī)械工業(yè)出版社,1995.
18
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