Papers by Keyword: Fixture

Paper TitlePage

Authors: H. Wu, Liang Li, N. He
Abstract: Micro milling force is the main parameter in motoring dynamic cutting process. The natural frequency of dynamometer is the key factor in the accurate measurement of high speed milling force. In this paper, a new structure fixture is designed, and the natural frequency of the fixture is obtained by finite element methods. After optimizing the structure design, the fixture is produced for the force signal acquisition system, together with the forces transducer, signal acquisition card and the software based on the LabVIEW. The experiment shows that the design of the fixture can meet the requirements of force acquisition.
Authors: Yan Cao, Dan Yang, Yu Bai
Abstract: Based on Group Technology, a machine tool fixture library management system based on assembly knowledge description is put forward to maximize the reuse of fixture design knowledge and experience. According to GT classification results, fixture parts are divided into standard ones and non-standard ones. To support parametric assembly, a reuse library is used for parametric standard part design. For the non-standard parts, second development technology is used to realize their parametric design based on 3D model templates. Parametric assembly design is achieved based on assembly relation description. SolidWorks platform, VB programming language and Access database are used to develop the system that includes feature-based parameter-driven parts and assemblies for machine tool fixtures.
Authors: Yuan Chao Deng
Abstract: A theoretical study has been made on the cam-clamping device. In this article, we consider specifically the calculations of cam geometry, calculations of clamping force and clamping torque, conditions for self-locking, and conditions for contact strength. Machine fixtures are essential in the process of mechanical manufacturing. There are many different types of fixtures, such as manual jig, pneumatic clamps, hydraulic fixtures, electric fixtures, etc. There are also many ways of clamping, such as incline clamp, screw clamp, eccentric circle clamp, hinge clamp [1], among which the eccentric circle clamp finds wide applications, especially in fast-clamping devices. Although the circular eccentric fixture possesses the advantages of simple structure, convenient manufacturing, and low cost, it suffers the drawbacks of small clamping force, short clamping-surface travel distance, and unreliable self-locking mechanism. The cam-clamping device discussesed in this article involves replaceing the eccentric circle with a cam, as shown in Fig. 1. The cam profile curve can be designed according to any requirements. The advantages of this replacement are obvious, in addition to preserving the advantages of the circular eccentric fixture, the cam-clamping can be designed according to the actual needs of clamping paths and selection of the appropriate cam profile to improve the self-locking.
Authors: Felicia Veronica Banciu, George Drăghici, Eugen Pămîntaş
Abstract: the paper proposes an axiomatic design view of orientation schemes used in fixture design, in context of using the axiomatic design rules and guidance to fixture design. In this paper the axiomatic design, matrix and rules are applied to orientation schemes in order to see what kind of designs result (uncoupled, decoupled) and how can be applied the information axiom to choose among the orientation schemes that one (s) that are best suited for the declared purposes-minimum orientation errors.
Authors: Xing Dong Shen
Abstract: The application accuracy control system with the three datum planes in machining fixture accuracy design can be used to be integrity for the item, index sign reasonable, to be easily for the criterion design and be advantageous to the computer assistance fixture design.
Authors: Rubina Bahar, Nur Adilah Yahya, Tasnim Firdaus Ariff
Abstract: In manufacturing industries, workpiece clamping is one of the basic requirement prior to machining process as the clamping system is responsible to maintain the workpiece rigidity and withstand the cutting force generated from the machining process. Besides, Clamping device is one of the reasons which influence the surface integrity of a part. Clamping workpieces for machining can be challenging especially for intricate non-symmetric geometry and vulnerable parts. In this study, a new system has been designed and developed where the workpiece is submerged in a fluid and the fluid is completely frozen to form ice that holds the workpiece rigidly. This ice clamping system can hold any parts of the workpiece regardless of their geometry and fragility. To freeze the desired workpiece, the energy required for 942 cm3 of clamping fluid was 98.43 kJ. Total freezing time was 90 minutes. Further development on the system is required in terms of improving freezing time and de-freezing of the work-piece.
Authors: Zhuo Lin, Rui Qi Song
Abstract: A kind of measuring device for overlap values is designed and described in this paper, which can be adapted to various types of servo slide valve, especially to the large flow valve. An automatically location of the spool is realized in this equipment, as well as the auto-centering. Also, a micro-drive mechanism structure acting with high precision is fabricated. The operating process is clarified in detail. An improved reliability of the whole testing system is achieved with help of this very configuration, result from which the accuracy of overlap value measurement is enhanced.
Authors: Liu Xu, Chao Ma, Xia Xie
Abstract: In automobile industry, automobile welding fixture is component important to auxiliary welding. The automobile body is welded by multiple complex sheet stamping parts and other auxiliary workpiece. In the process ,supporting role of welding fixture is an important step. In this paper, the fixture welding was designed and analyzed briefly.
Authors: Wei Bin Wu, Tian Sheng Hong, Chileshe Joseph Mwape, Hao Biao Li
Abstract: In an automobile, a stable and durable alternator is extremely important. Based on the basic characteristics of the alternators now on the mainstream market, the hardware simulation method was used to build a simulated “car engine-alternator-auto load-the external environment hardware environment” system. High and low temperature humidity test chamber simulates the vehicle internal environment and the inverter driving power frequency conversion is used to simulate motor car engine power system. It uses fixtures, belts, and pulleys to simulate the connection of the engine to the alternator. In addition it uses electronic load cases to simulate automobile electric power consumption with all kinds of current, voltage, speed signal components to provide feedback signals based on the testing system of alternator to make comparisons. The testing system is designed by analyzing and optimizing the structural mechanics of the whole system according to the requirement of the hardware system layout. For each part of the system factors of design were considered included shape, size, material selection process and heat treatment. Parts and detailed drawings were prepared and later sent for fabrication. The tests indicate that hardware alternator testing system has no major defects that can prevent it from being developed for commercial use.
Authors: Li Liang, Yu Ming Guo
Abstract: Measuring the tensile strength at the suture line of walnut shell is difficult by general fixtures. In this paper, a particular fixture was designed for measuring the tensile properties of the whole walnut shell based on the Pro/E software. The rigidities of main parts were checked by theory of mechanics combined with ANSYS. The results show that all the deformations were within the permissible scope, that is to say, this design is reasonable. Besides, four adjusting levers are designed to meet the size requirements of vary walnuts whose diameter is from 28mm to 40mm. Meanwhile, it can be conveniently located on the electronic universal testing machine.
Showing 1 to 10 of 40 Paper Titles