design optimization of cnc vertical milling machine bed

Ngày tải lên: 05/09/2013, 14:58

Ngày tải lên: 05/09/2013, 16:11

Ngày tải lên: 08/09/2013, 20:50

... so với F CNC . Kết quả là tốc độ chạy dao trung bình sẽ lớn hơn giá trị sử dụng cho máy CNC thông thờng (F CNC ). Đây chính là dạng thờng gặp nhất của AC. Hình 2: Sơ đồ nguyên lý máy CNC có điều ... một khối các modul logic và một modul PID. - Hệ đợc ghép với CNC qua một đờng riêng để truyền lệnh điều khiển cho CNC. Bây giờ CNC phải nhận lệnh điều khiển từ 2 nguồn: chơng trình NC và AC. ... chiều sâu cắt t và lực cắt P (lực cắt là hàm của t). Trên máy CNC, để đảm bảo an toàn, ngời ta lập trình với tốc độ chạy dao F CNC tơng ứng với chiều sâu cắt lớn nhất. Mặc dù phần lớn thời...

Ngày tải lên: 10/12/2013, 13:16

Ngày tải lên: 23/03/2014, 22:21

Ngày tải lên: 02/04/2014, 15:50

... Introduction . . 353 10.2 DesignofSoftwareArchitecture 356 10.2.1 CNCSystemModeling 356 10.3 DesignofSoft-NCSystem 359 10.3.1 Design of Task Module . 359 10.3.2 DesignoftheSystemKernel 361 10.3.3 ... is composed of two parts with a total of 11 chapters: Part I is composed of Chapters 1–6 on the principle and design of CNC, and Part II is composed of an open-architectural soft CNC system. ... method of automatic control of the weaving of fabrics with a loom machine by using punch cards and this method was the beginning of the concept of NC. The concept of NC was actually applied to machine...

Ngày tải lên: 27/06/2014, 06:20

... subject to the Terms of Use as given at the website. PROPERTIES OF ENGINEERING MATERIALS TABLE 1-25 Mechanical properties of carbon and alloy steel bars for the production of machine parts Ultimate ... 500 million cycles of completely reversed stresses using rotating beam-type machine and specimen. d At 0.2% offset. e Average of tension and compression moduli. Key: Temper designations: F, as ... composition, % Tensile strength, min,  st 0.2% proof stress, min,  sy Hardness number Elongation in 50 mm (2 in), Reduction of area, min, Designation of steel C Si Mn Ni Cr Mo Ti Nb S max P max MPa...

Ngày tải lên: 27/06/2014, 12:20

... Schematic of design as part of an engineering enterprise. Introduction 15 if all of these indicators are acceptable. Design will determine the specications of the various components of the ... 286 Chapter 5 Acceptable Design of a Thermal System: A Synthesis of D ifferent Design Steps 299 5.1 Introduction 299 5.2 Initial Design 300 5.3 Design Strategies 309 5.3.1 Commonly Used Design Approach ... company is closely linked with the design and optimization of new processes and systems and optimiza- tion of existing ones. Consequently, the subject of design, which had always been important,...

Ngày tải lên: 27/06/2014, 17:20

... the overallprocedure.ThisisfollowedinChapter6byadiscussionofeconomic factors in design since these often guide system design and optimization. The for- mulationoftheoptimizationproblemisexplainedinChapter7.Thepresentation on optimization ... and evaluation of the chances of success and the feasibility of the undertaking, an engineering design of the system is initiated Introduction 17 Optimization of a system is often based on ... to thedevelopmentofthismaterialandtomyunderstandingofthedesignprocess. OfparticularhelphavebeenthemanydiscussionsIhavehadwithProfessors V.SernasandN.A.LangranaofRutgersUniversityonthedesignofsystems. My...

Ngày tải lên: 27/06/2014, 17:20

... to thedevelopmentofthismaterialandtomyunderstandingofthedesignprocess. OfparticularhelphavebeenthemanydiscussionsIhavehadwithProfessors V.SernasandN.A.LangranaofRutgersUniversityonthedesignofsystems. My ... 286 Chapter 5 Acceptable Design of a Thermal System: A Synthesis of D ifferent Design Steps 299 5.1 Introduction 299 5.2 Initial Design 300 5.3 Design Strategies 309 5.3.1 Commonly Used Design Approach ... years on design projects and on practi- cal design problems have also provided important insights into the design pro- cess.ThecommentsofthemanuscriptreviewersandofProfessorJ.R.Lloyd ofMichiganStateUniversity,theeditorofthisseries,havebeenveryvaluable andhelpfulinorganizingandpresentingthematerial.Iwouldliketotakethe opportunitytothankeachofthemanuscriptreviewerspersonally.Thereview- ersareJamalSeyed-Yagoobi,TexasA&MUniversity;AndrewV.Tangborn, Northeastern...

Ngày tải lên: 06/08/2014, 15:20

... obtained Yes No Acceptable? Analysis and evaluation Experimental data Material properties Redesign Initial design Components Inputs FIGURE 1.4 Schematic of a typical design procedure. 2 Design and Optimization of Thermal Systems those arising in different elds of engineering, ... of heattransfer,bothfromASME.Healsoreceivedthe1994DistinguishedAlumni AwardfromtheIndianInstituteofTechnology,Delhi. JaluriaisaFellowofASMEandamemberofseveralotherprofessional societies.HeservedasthechairoftheHeatTransferDivisionofASMEduring 2002–2003. He is presently the editor of the ASME Journal of Heat Transfer. 8 Design and Optimization of Thermal Systems (a) Hot Cold (b) Hot Cold (c) Tube ... evaluation of the enterprise must include all expenses that are expected to be incurred. Besides the cost of manufacture of the given item and the expense of advertising and sales, the cost of designing...

Ngày tải lên: 06/08/2014, 15:20

... range or domain of acceptable designs is generally obtained. The evalu- ation of the designs requires detailed information on the performance of the sys- tem. Because of the complexity of most practical ... variety of applications, 44 Design and Optimization of Thermal Systems applications. The diversity of thermal systems and the range of concerns in these systems are also examined. The need for design ... to more 40 Design and Optimization of Thermal Systems design and optimization are similar, making it possible to discuss the fundamen- tal issues and procedures involved in their design. 1.4...

Ngày tải lên: 06/08/2014, 15:20

... Basic Considerations in Design 71 3. Simulation of the system 4. Evaluation of different designs 5. Iteration and obtaining an acceptable design 6. Optimization of the system design 7. Automation ... existing systems. Frequently, optimization of the system or of the process is achieved by such changes in the design. The conceptual design is then simply the design of the existing system, along ... Conceptual design Initial design Modeling and simulation Evaluation No Yes Acceptable? Solution Iterative redesign FIGURE 2.13 Iterative process to obtain an acceptable design. 48 Design and Optimization...

Ngày tải lên: 06/08/2014, 15:20

... position in the design process. Optimization is of particular importance in thermal systems because of the strong dependence of cost and output on system design. Usually, the optimal design is not ... Acceptable design Design evaluation Simulation Optimal design Automation and control Modeling Communication of design Physical process or system Redesign FIGURE 2.14 Various steps involved in the design ... 2.14 Various steps involved in the design and optimization of a thermal system and in the implementation of the design. 84 Design and Optimization of Thermal Systems it allows one to operate...

Ngày tải lên: 06/08/2014, 15:20

... 118 Design and Optimization of Thermal Systems (c) Extrusion of aluminum from a heated cylindrical block, of diam- eter 15 cm at a temperature of 600 K, to a rod of diameter 5 cm at the rate of ... selection of the type of material, narrowing of the available choices, and nal selec- tion of an appropriate material. 2.6 SUMMARY This chapter presents the basic features of design of thermal ... Different techniques are available for the 114 Design and Optimization of Thermal Systems Conceptual design is the next step in the design of a thermal system to meet a given need or opportunity....

Ngày tải lên: 06/08/2014, 15:20

... insulated outer surface of a heat exchanger. 142 Design and Optimization of Thermal Systems The applicability of the lumped body approximation is based on the ratio of the convective resistance ... obtaining and comparing alternative designs by predicting the performance of each design, ulti- mately leading to an optimal design. Thus, the design and optimization processes are closely coupled ... which a given level of purity must be achieved. (a) Give the formulation of the design problem. (b) Provide a sketch of a possible conceptual design. (c) Suggest the location of two sensors for...

Ngày tải lên: 06/08/2014, 15:20

... furnace for heat treatment of materials. 152 Design and Optimization of Thermal Systems Example 3.3 In the design of a hot water storage system, it is given that a steady ow of hot water at 75nC ... solution of the mathematical equations and to study the behavior and char- acteristics of the system. This is the process of simulation of the system under a variety of operating and design conditions. ... signicance of the various dimensionless parameters. 162 Design and Optimization of Thermal Systems outer surface of the furnace should lower the temperatures. Thus, the results from the solution of...

Ngày tải lên: 06/08/2014, 15:20

... method of 194 Design and Optimization of Thermal Systems Solution The variation of Q with D and $p may be written for a power-law variation as Q  BD a ($p) b Taking the natural logarithm of ... distribution of data points, and the determination of the coefcients of the poly- nomial does not require the solution of a system of equations, as was the case for the general polynomial. Because of ... a best t to represent these data. 188 Design and Optimization of Thermal Systems y avg being the average, or mean, of the given data. Then the extent of improvement due to curve tting by...

Ngày tải lên: 06/08/2014, 15:20

Ngày tải lên: 06/08/2014, 15:20