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制造自動化 金屬切削力學(xué)、機床振動和CNC設(shè)計(第二版)英文版 讀者對象:本書適用于高年級本科生和研究生及研發(fā)工程師
本書重點介紹了金屬切削過程力學(xué)、機床動力學(xué)及振動、進(jìn)給驅(qū)動設(shè)計和控制、CNC設(shè)計原理、傳感器輔助加工和數(shù)控編程技術(shù)等知識。從切削過程力學(xué)的基本原理開始,深度討論了振動及顫振問題;也討論了數(shù)控編程和計算機輔助設(shè)計/計算機輔助制造(CAD/CAM)技術(shù)。文中還詳細(xì)介紹了驅(qū)動執(zhí)行機構(gòu)、反饋傳感器的選擇、進(jìn)給驅(qū)動系統(tǒng)的建模與控制、軌跡實時生成和插補算法的設(shè)計、面向數(shù)控系統(tǒng)的誤差分析等。每一章都包括從企業(yè)實際、設(shè)計項目和工作問題中篩選的案例。
《制造自動化:金屬切削力學(xué)、機床振動和CNC設(shè)計(第二版)(英文版)》基于120多篇期刊文章和60多篇反映作者工程、研究和教學(xué)經(jīng)驗的研究論文,重點介紹了金屬切削過程力學(xué)、機床動力學(xué)及振動、進(jìn)給驅(qū)動設(shè)計和控制、CNC設(shè)計原理、傳感器輔助加工和數(shù)控編程技術(shù)等知識。
導(dǎo) 讀
制造業(yè)是我國國民經(jīng)濟的支柱產(chǎn)業(yè),也是我國經(jīng)濟增長的主導(dǎo)部門和經(jīng)濟轉(zhuǎn)型的基礎(chǔ)。我國正面臨著從制造業(yè)大國向制造業(yè)強國轉(zhuǎn)變的關(guān)鍵時期,用先進(jìn)制造技術(shù)振興制造業(yè),提升自主研發(fā)能力,樹立“中國制造”“中國創(chuàng)造”“中國智造”的品牌是迫在眉睫的任務(wù)。 切削加工是機械制造中最基本的加工方法之一,利用刀具切除被加工對象上的多余材料,從而得到形狀、精度和表面質(zhì)量都符合預(yù)定要求的表面!肮び破涫,必先利其器”,選擇合理的刀具及切削參數(shù)進(jìn)行切削加工,是保證加工效率和加工質(zhì)量的重要要素。影響切削加工效率的因素很多,如切削參數(shù)選擇、工藝過程設(shè)計、工藝系統(tǒng)設(shè)計和生產(chǎn)管理等,但切削參數(shù)的選擇是制約加工效率提高的主要因素。 基于切削加工過程的建模和仿真旨在通過建立適當(dāng)?shù)哪P,通過仿真結(jié)果來研究切削加工參數(shù)對不易觀察到的切削現(xiàn)象的影響,從而更加深入地了解切削加工機理和評判選擇該切削參數(shù)的合理性。加工過程仿真包括幾何仿真和物理仿真(主要是動力學(xué)仿真),然而前者只能解決干涉驗證的問題,卻無法對直接影響加工效率和質(zhì)量的各種物理因素(如切削力、振動、變形、溫度等)提供必要的仿真和預(yù)測功能。隨著企業(yè)對生產(chǎn)加工過程高效率、高精度的要求,單純的幾何仿真技術(shù)已經(jīng)不能滿足現(xiàn)代生產(chǎn)的需要。在實際應(yīng)用中,銑削力、振動和變形等因素已經(jīng)成為直接影響加工過程優(yōu)劣的關(guān)鍵;诩庸み^程的動力學(xué)仿真技術(shù)在幾何仿真的基礎(chǔ)上,從動力學(xué)角度對整個加工過程中的各種物理量、物理因素進(jìn)行建模和仿真分析,從而在實際加工前預(yù)測出不同切削參數(shù)與物理量之間的相互關(guān)系,預(yù)先對加工質(zhì)量進(jìn)行評估。 西方發(fā)達(dá)國家對數(shù)控加工領(lǐng)域內(nèi)的切削過程仿真優(yōu)化技術(shù)進(jìn)行了較早且較為深入的理論研究和實際應(yīng)用,具有較高的技術(shù)水平,其主要研究成果已經(jīng)成為相應(yīng)的商業(yè)化應(yīng)用軟件。同時,作為現(xiàn)代先進(jìn)制造技術(shù)領(lǐng)域內(nèi)的一個研究方向,也有必要對加工過程動力學(xué)仿真優(yōu)化技術(shù)進(jìn)行深入、系統(tǒng)的研究。因此,著眼于加工過程動力學(xué)建模和仿真的研究具有重要的理論價值和創(chuàng)新意義。 本人自1996年起至今,一直從事數(shù)控編程、數(shù)控加工技術(shù)、數(shù)控機床等方面的教學(xué)及科研工作。2003年,本人于南京航空航天大學(xué)攻讀博士學(xué)位期間,有幸閱讀了2002年由化學(xué)工業(yè)出版社出版的《數(shù)控技術(shù)與制造自動化》(羅學(xué)科翻譯)及其原著(Yusuf Altintas著)。后來,2008年本人南京航空航天大學(xué)博士后流動站學(xué)習(xí)和科研期間,多次關(guān)注Yusuf Altintas教授所在團隊發(fā)表的論文和科研工作,特別是2011年參加的在北京航空航天大學(xué)由劉強教授主持的學(xué)術(shù)研討會期間,親自聆聽了Yusuf Altintas的學(xué)術(shù)報告。在2013年1月至2014年2月,本人在加拿大英屬哥倫比亞大學(xué)(UBC)的制造自動化實驗室(MAL)訪學(xué)1年多,有幸?guī)煆膰H制造自動化領(lǐng)域知名學(xué)者Yusuf Altintas教授。Yusuf Altintas教授現(xiàn)任加拿大皇家科學(xué)院(RSC)院士、國際生產(chǎn)工程學(xué)會(CIRP)主席、加拿大工程院院士、美國機械工程師學(xué)會(ASME)和國際制造工程師學(xué)會(SME)會士,加拿大英屬哥倫比亞大學(xué)機械工程系終身教授。Yusuf Altintas教授是享譽世界的制造領(lǐng)域著名專家,主要研究方向為金屬切削、機床振動、控制和虛擬加工等,其著作Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design, Second Edition被廣泛使用。他領(lǐng)導(dǎo)的實驗室開發(fā)了先進(jìn)加工過程仿真工具(CUT*PRO)、虛擬加工過程仿真工具(MACH*PRO),以及開放式模塊化數(shù)控加工系統(tǒng)(Virtual CNC),這些產(chǎn)品已被全球機械加工領(lǐng)域超過200家公司和研究機構(gòu)使用。 在電子工業(yè)出版社的努力下,Yusuf Altintas教授的這本著作得以出版影印版。本書基于120多篇期刊文章和60多篇反映作者工程、研究和教學(xué)經(jīng)驗的研究論文,重點介紹了金屬切削過程力學(xué)、機床動力學(xué)及振動、進(jìn)給驅(qū)動設(shè)計和控制、CNC設(shè)計原理、傳感器輔助加工和數(shù)控編程技術(shù)等知識。
Yusuf Altintas教授現(xiàn)任加拿大皇家科學(xué)院(RSC)院士、國際生產(chǎn)工程學(xué)會(CIRP)主席、加拿大工程院院士、美國機械工程師學(xué)會(ASME)和國際制造工程師學(xué)會(SME)會士,加拿大英屬哥倫比亞大學(xué)機械工程系終身教授。Yusuf Altintas教授是享譽世界的制造領(lǐng)域著名專家,主要研究方向為金屬切削、機床振動、控制和虛擬加工等,其著作Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design, Second Edition被廣泛使用。他領(lǐng)導(dǎo)的實驗室開發(fā)了先進(jìn)加工過程仿真工具(CUT*PRO)、虛擬加工過程仿真工具(MACH*PRO),以及開放式模塊化數(shù)控加工系統(tǒng)(Virtual CNC),這些產(chǎn)品已被全球機械加工領(lǐng)域超過200家公司和研究機構(gòu)使用。
CHAPTER ONE INTRODUCTION?...........................................1
CHAPTER TWO MECHANICS OF METAL CUTTING?...................................4 2.1 Introduction?..............................................4 2.2 Mechanics of Orthogonal Cutting?.............................4 2.3 Mechanistic Modeling of Cutting Forces?....................15 2.4 Theoretical Prediction of Shear Angle?.........................18 2.5 Mechanics of Oblique Cutting?............................19 2.5.1 Oblique?Cutting?Geometry?.............................19 2.5.2 Solution?of?Oblique?Cutting?Parameters?..................21 2.5.3 Prediction?of?Cutting?Forces?.................................25 2.6 Mechanics of Turning Processes?.......................27 2.7 Mechanics of Milling Processes?......................35 2.7.1 Mechanics?of?Helical?End?Mills?...........................41 2.8 Analytical Modeling of End Milling Forces?......................43 2.8.1 Mechanistic?Identification?of?Cutting?Constants?in?Milling?...................46 2.9 Mechanics of Drilling?...........................47 2.10 Tool Wear and Tool Breakage.........................54 2.10.1 Tool?Wear?...........................56 2.10.2 Tool?Breakage?.................61 2.11 Problems?............................62 CHAPTER THREE STRUCTURAL DYNAMICS OF MACHINES?...................66 3.1 Introduction?......................66 3.2 Machine Tool Structures....................66 3.3 Dimensional Form Errors in Machining?...........68 3.3.1 Form?Errors?in?Cylindrical?Turning?............68 3.3.2 Boring?Bar?.....................70 3.3.3 Form?Errors?in?End?Milling?...........71 3.4 Structural Vibrations in Machining..............74 3.4.1 Fundamentals?of?Free?and?Forced?Vibrations?.............75 3.4.2 Oriented?Frequency?Response?Function..............82 3.4.3 Design?and?Measurement?Coordinate?Systems?........83 4.4 Analytical?Modal?Analysis?for?Multi–Degree-of-Freedom?Systems?..........................85 3.4.5 Relative?Frequency?Response?Function?between?Tool?and?Workpiece?......................90 3.5 Modal Testing of Machine Structures?...................................92 3.5.1 Theory?of?Frequency?Response?Testing?...........................92 3.5.2 Experimental?Procedures?in?Modal?Testing?...........................97 3.6 Experimental Modal Analysis for Multi–Degree-of-Freedom Systems?........98 3.7 Identification of Modal Parameters?..........................109 3.7.1 Global?Nonlinear?Optimization?of?Modal?Parameter?Identification?.........................113 3.8 Receptance Coupling of End Mills to Spindle-Tool Holder Assembly?........115 3.8.1 Experimental?Procedure?...................118 3.9 Problems?.................................120 CHAPTER FOUR MACHINE TOOL VIBRATIONS?.................................................125 4.1 Introduction?.......................125 4.2 Stability of Regenerative Chatter Vibrations in Orthogonal Cutting?.........126 4.2.1 Stability?of?Orthogonal?Cutting...................................126 4.2.2 Dimensionless?Analysis?of?Stability?Lobes?in?Orthogonal?Cutting.................132 4.2.3 Chatter?Stability?of?Orthogonal?Cutting?with?Process?Damping?..............................135 4.3 Chatter Stability of Turning Operations?.............................................139 4.4 Chatter Stability of Turning Systems with Process Damping?.........................142 4.4.1 Metal?Cutting?Forces?.............................144 4.4.2 Process?Damping?Gains?Contributed?by?Flank?Wear?.....................145 4.4.3 Stability?Analysis?......................147 4.5 Experimental Validation?........................148 4.6 Analytical Prediction of Chatter Vibrations in Milling?..................149 4.6.1 Dynamic?Milling?Model?..................149 4.6.2 Zero-Order?Solution?of?Chatter?Stability?in?Milling?..................154 4.6.3 Multi-Frequency?Solution?of?Chatter?Stability?in?Milling?.................160 4.7 Chatter Stability of Drilling Operations?............172 4.7.1 Dynamic?Drilling?Force?Model?..................173 4.8 Frequency Domain Solution of Drilling Stability?.................176 4.9 Semidiscrete Time Domain Solution of Chatter Stability?...................178 4.9.1 Orthogonal?Cutting?......................178 4.9.2 Discrete?Time?Domain?Stability?Solution?in?Milling?...............182 4.10 Problems...............186 CHAPTER FIVE TECHNOLOGY OF MANUFACTURING AUTOMATION?.......191 5.1 Introduction?..............191 5.2 Computer Numerically Controlled Unit?.............191 5.2.1 Organization?of?a?CNC?Unit?..........................191 5.2.2 CNC?Executive........................................193 5.2.3 CNC?Machine?Tool?Axis?Conventions?..................................193 5.2.4 NC?Part?Program?Structure?........................193 5.2.5 Main?Preparatory?Functions?.................................196 5.3 Computer-Assisted NC Part Programming?...........................201 5.3.1 Basics?of?Analytical?Geometry..................................201 5.3.2 APT?Part?Programming?Language?...................................206 5.4 Trajectory Generation for Computer-Controlled Machines?...........................211 5.4.1 Interpolation?with?Constant?Displacement....................................212 5.4.2 Acceleration-Limited?Velocity?Profile?Generation?with?Constant?Interpolation?Period?...216 5.4.3 Jerk-Limited?Velocity?Profile?Generation?....................................220 5.5 Real-Time Interpolation Methods?...................................229 5.5.1 Linear?Interpolation?Algorithm?.............................230 5.5.2 Circular?Interpolation?Algorithm?.....................234 5.5.3 Quintic?Spline?Interpolation?within?CNC?Systems?...............................239 5.6 Problems?..................245 CHAPTER SIX DESIGN AND ANALYSIS OF CNC SYSTEMS?..............250 6.1 Introduction?..........................250 6.2 Machine Tool Drives?..........................250 6.2.1 Mechanical?Components?and?Torque?Requirements....................251 6.2.2 Feedback?Devices?...................................256 6.2.3 Electrical?Drives........................................257 6.2.4 Permanent?Magnet?Armature-Controlled?dc?Motors?..................................................258 6.2.5 Position?Control?Loop?......................................263 6.3 Transfer Function of the Position Loop?..............................264 6.4 State Space Model of Feed Drive Control Systems?..............................................268 6.5 Sliding Mode Controller?.....................................281 6.6 Active Damping of Feed Drives?........................285 6.7 Design of an Electrohydraulic CNC Press Brake?....................293 6.7.1 Hydraulic?Press?Brake?System?......................293 6.7.2 Dynamic?Model?of?Hydraulic?Actuator?Module?.............296 6.7.3 Identification?of?Electrohydraulic?Drive?Dynamics?for?Computer?Control?............299 6.7.4 Digital?Position?Control?System?Design?..............301 6.8 Problems?..........................307 CHAPTER SEVEN SENSOR-ASSISTED MACHINING?............313 7.1 Introduction?.....................313 7.2 Intelligent Machining Module?..................313 7.2.1 Hardware?Architecture?....................314 7.2.2 Software?Architecture?...............315 7.2.3 Intelligent?Machining?Application?..............316 7.3 Adaptive Control of Peak Forces in Milling?.......................317 7.3.1 Introduction?............................317 7.3.2 Discrete?Transfer?Function?of?the?Milling?Process?System?.......................................319 7.3.3 Pole-Placement?Control?Algorithm?.................................321 7.3.4 Adaptive?Generalized?Predictive?Control?of?Milling?Process?............325 7.3.5 In-Process?Detection?of?Tool?Breakage?..............................330 7.3.6 Chatter?Detection?and?Suppression?..............................333 7.4 Intelligent Pocketing with the IMM System?..........................334 7.5 Problems?......................................................336 APPENDIX A LAPLACE AND z TRANSFORMS?....................................................341 PPENDIX B OFF-LINE AND ON-LINE PARAMETER ESTIMATION WITH LEAST SQUARES?.................................353 Bibliography?............................................................357 Index?.......................................363
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