Có 20+ tài liệu thuộc chủ đề "sổ tay cơ khí"
tailieu.vn Xem trực tuyến Tải xuống
Feed rate is 0.125 in / r (3.17 mm / r);. tool life is based on 0.030-in (0.726-mm) flank wear. It can be said that n is one of the controlling influences on Hi-E cutting conditions.* Thus, for high-speed steel, the expression for T c is:. (5) turn 0.300-in (0.8-cm) diameter part, 0.0075 h. What depth of cut is needed...
tailieu.vn Xem trực tuyến Tải xuống
8596Ch01Frame Page -1 Tuesday, November PM. Manufacturing Systems and Their Design Principles. Adjustments in Modern Manufacturing Systems 1.4 Critical Role of Computers in Modern. 1.5 Design Principles of Modern Manufacturing Systems. Product Design and Design for Manufacturability • Process Planning and System Design of Manufacturing Systems • Software/Hardware Architecture and Communications in Manufacturing Systems • Monitoring and Control of Manufacturing...
tailieu.vn Xem trực tuyến Tải xuống
Computer-Aided Process Planning for Machining. 2.2 What Is Computer-Aided Process Planning (CAPP)?. This chapter presents an overview of the research work in computer-aided process planning (CAPP) during the past 2 decades. Commercial viability of computer-based tools has occurred at either end of the product life cycle, i.e., in product design and in manufacturing. Practically, these increases are yet to be...
tailieu.vn Xem trực tuyến Tải xuống
at the end of the line, it becomes a finished product. The state of the manufacturing system is one of a finite set of states, rather than a collection of continuous variables. whereas, the continuous model of the gripper would contain position, velocity, and force variables to indicate how wide the gripper is open, how fast it is moving, and...
tailieu.vn Xem trực tuyến Tải xuống
Machine Tool Dynamics and Vibrations. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations. In general, the table is connected to the nut, and the nut houses a lead screw. The operator controls the motion of the machine from an operator panel of...
tailieu.vn Xem trực tuyến Tải xuống
and (2) process optimi- zation, for the purpose of improving the quality of the part or reducing operation time based on feedback from the process.. Expected values of measurements are either determined according to an analytical model of the process 1 or established empirically. 5.2.1 Tool Wear Estimation. Flank wear directly influences the size and quality of the surface. 3...
tailieu.vn Xem trực tuyến Tải xuống
In this chapter, we present techniques for monitoring and controlling the process phenomena that arise due to the interaction of the cutting tool and the workpiece (e.g., force generation, chatter, tool failure, chip formation).. Process monitoring is the manipulation of sensor measurements (e.g., force, vision, temperature) to determine the state of the processes. Sensor measurements of the process are then...
tailieu.vn Xem trực tuyến Tải xuống
Process Control Issues • The Process: Material Diagram • The Machine Control Diagram. In all cases, the processes involve plastic deformation of the workpiece, and the resulting strong forces required to create plastic stresses. The major difference is that the latter involves a complex three-dimensional flow of the material, while the former tends to be dominated by plane strain conditions,...
tailieu.vn Xem trực tuyến Tải xuống
Mating of part features is the main function of the assembly process. Type II assemblies are those where some or all of the assembly features and/or their relative locations are defined during assembly. Monitoring of an assembly process can be accomplished by either directly monitoring the quality characteristics of the assembled products (i.e., key product characteristics or KPCs), or monitoring...
tailieu.vn Xem trực tuyến Tải xuống
This chapter provides an overview of modeling, measurement, and control strategies in polymer pro- cessing, and discusses some of the difficulties posed by their complex and distributed nature.. Most plastic parts are fabricated by thermoforming, extrusion, or injection molding. The resulting part typically exhibits thickness distributions from 10 to 90% of the initial sheet thickness, with mold cycle times varying...
tailieu.vn Xem trực tuyến Tải xuống
Typically, the term random implies that the causes of the errors are not understood and cannot be eradicated. Figure 10.1 presents some of the factors affecting workpiece accuracy. Accuracy : A quantitative measure of the degree of conformance to recognized national or international standards of measurement.. Repeatability : A measure of the ability of a machine to sequentially position a...
tailieu.vn Xem trực tuyến Tải xuống
11.1 Introduction 11.2 Active Struts. 11.3 Active Tendon Control. 11.4 Active Damping Generic Interface 11.5 Microvibrations. 11.6 Conclusions. 11.1 Introduction. 11.2 Active Struts. 11.2.1 Open-Loop Dynamics of an Active Truss. (11.1) where d 33 is the piezoelectric coefficient, n is the number of piezoelectric ceramic elements in the actuator. This equation neglects the hysteresis of the piezoelectric expansion.. As for...
tailieu.vn Xem trực tuyến Tải xuống
12.1 Introduction. 12.2 Semi-Active Suspensions Design. 12.3 Adjustable Suspension Elements. 12.4 Automotive Semi-Active Suspensions. 12.5 Application of Control Techniques to Semi-Active Suspensions. 12.6 Practical Considerations and Related Topics. 12.1.1 Vibration Isolation vs. Unlike the isolator, a vibration absorber consists of a secondary system (usually mass–spring–damper trio) added to the primary device to protect it from vibrating (see Figure 12.1c). 12.1.2...
tailieu.vn Xem trực tuyến Tải xuống
Semi-Active Suspension Systems II. 13.1 Concepts of Semi-Active Suspension Systems. 13.2 Control Design Methodology. 13.3 Properties of Semi-Active Suspensions:. 13.4 Examples of Practical Applications. 13.1.1 Karnopp’s Original Concept. FIGURE 13.1 Variable damper and the working principle.. FIGURE 13.2 Variable force transfer and the working principle.. FIGURE 13.3 Variable spring stiffness and the working principle.. Using these semi-active devices the properties...
tailieu.vn Xem trực tuyến Tải xuống
14.1 Introduction. 14.2 Delayed Resonator Dynamic Absorbers. Stability of the active system.. 14.2.1 The Delayed Resonator Dynamic Absorber with Acceleration Feedback. (14.5) By this selection of the feedback gain and delay, i.e., g = g c and τ = τ c , the DR can be tuned to the desired frequency ω c in real time. (14.8) where:. (14.9) With...
tailieu.vn Xem trực tuyến Tải xuống
15.1 Introduction. 15.3 Active-Passive Hybrid Piezoelectric Network Treatments for General Modal Damping and Control. 15.4 Active-Passive Hybrid Piezoelectric Network Treatments for Narrowband Vibration Suppression. 15.5 Nonlinear Issues Related to Active-Passive Hybrid Piezoelectric Networks. 15.6 Summary and Conclusions. Some of the advantages of piezo- electric actuators include high bandwidth, high precision, compactness, and easy integration with existing host structures to form...
tailieu.vn Xem trực tuyến Tải xuống
16.1 Introduction 16.2 Cantilevered Beam. 16.3 Axially Moving Web. 16.4 Flexible Link Robot Arm. 16.5 Summary. 16.1 Introduction. In contrast to distributed sensing/actuation control techniques, boundary controllers are applied at the boundaries of the flexible system, and as a result, require fewer sensors/actuators.. (16.1) along with the boundary conditions. (16.2) where denotes the independent position variable, denotes the independent time...
tailieu.vn Xem trực tuyến Tải xuống
17.1 Introduction. 17.5 Concluding Remarks. 17.1.1.1 Tension Stabilizes. 17.1.3 The Analyzed Structures. FIGURE 17.3 Tensegrity structures.. 17.1.4.2.3 Summary. 17.1.5 Mass vs. (17.15). (17.19). (17.21). (17.24). (17.31). 17.2.3.1 Bucklings Load. (17.36). (17.37) where. p 2 = F/EI, (17.38). and B = e (17.40). From (17.41),. (17.42). (17.43). (17.44). (17.45) A e pL. (17.46). (17.48). (17.49). (17.50). (17.51). η ≥ F (17.52)....
tailieu.vn Xem trực tuyến Tải xuống
18.1 Introduction. 18.2 Tensegrity Definitions. Coordinate Transformations 18.5 Tendon Forces. 18.6 Conclusion. Appendix 18.A Proof of Theorem 18.1. (i, 1) Appendix 18.D Example Case (n,m. (3,1) Appendix 18.E Nodal Forces. FIGURE 18.2 Buckytubes.. 18.2.1 A Typical Element. FIGURE 18.6 A typical ij element.. FIGURE 18.7 Class 1 shell: (n,m. (18.10). t 7n(j–1) (18.11). (18.12). (18.13) and for j = m...
tailieu.vn Xem trực tuyến Tải xuống
19.1 Introduction. 19.2 Description of Orientation. 19.3 Direct Kinematics. 19.4 Inverse Kinematics. 19.5 Differential Kinematics. 19.6 Differential Kinematics Inversion. 19.7 Inverse Kinematics Algorithms. 19.8 Further Reading. 19.2.1 Rotation Matrix. (19.7) By using the following relations:. Equation (19.8) can be cast in the more compact form. (19.9) where I is the (3 × 3) identity matrix and S. (19.10). (19.11). (19.12)....