Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 174 for “"Workpiece"”.
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Cutter-workpiece engagement identification in multi-axis milling
… cutter swept volume generation, in-process workpiece modeling and Cutter Workpiece Engagement (CWE) algorithms for finding the instantaneous intersections between cutter and workpiece in milling. One of the steps in simulating machining operations is the accurate extraction of the …
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Temperature rise of the workpiece in metal cutting
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1957.
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Workpiece -Fixture Frictional Contact and Its Influence on Machining Performance
… machining process stability by taking the workpiece-fixture interaction into account. Results from machining process stability showed that the machining stability is strongly influenced by the frictional contact and the incorporation of its influence allows for optimal fixture design.
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Modelling and adaptive control of a roll bending process : workpiece dynamics
Thesis (Mech. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Conception of a flexible workpiece carrier to enable automated activities during transportation using a mobile manipulator
… purpose of the study was to develop a flexible workpiece carrier that enables automated value-adding operations to be carried out while the mobile manipulator is in motion. The research aimed to identify intralogistics tasks that can be executed during travel time and to design and validate a …
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Prediction of cutting forces and surface errors in face milling with generalized cutter and workpiece geometry
… etc. The surface flatness error of the machined workpiece is a key variable affecting the quality of the part and the productivity of the process.
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Dynamic response and optimal design of a lathe spindle under experimentally measured random cutting force excitations
… maximum mean square displacement response of the workpiece under the action of random cutting forces. The stochastic partial differential equation of motion characterizing the behavior of a lathe spindle-workpiece system is formulated based on the Euler-Bernoulli equation. A finite element method …
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The impact of fixturing error on feature tolerance allocation
<p>Fixtures are used to locate, hold and support workpieces during the operation. An accuracy of the workpiece is decided by a relative location and orientation of the workpiece coordinate system with respect to that of the fixture. The impact of surface variability at contact points on the …
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Investigation of electromagnetic welding
… the optimal gap between the outer and inner workpiece for the outer workpiece to reach the maximum velocity at impact. Good correlation was found with regards to the High-Speed Videography used to study the EMF process in further detail measuring velocities between 50 m/s and 100 m/s. …
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CAD enabling smart handtools
… the flow of information from and to a physical workpiece. Traditional input interfaces are limited in the sense that they lack a direct connection with the workpiece, forcing the user to translate information gathered from the workpiece before it can be input into the computer. A similar …
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The performance of ultra-hard cutting tool materials in maching aerospace alloy TA48
… carbide grades when cutting titanium alloy workpieces. Two important experimental techniques were employed during the course of this work, firstly a quasi-static contact method was employed to establish the workpiece/tool interfacial temperature above which strongly adherent layers may be …
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Automatic tool path generation for multi-axis machining
… multi-axis machining. Instead of redefining the workpiece in terms of machining features, we generate tool paths directly by analyzing the accessibility of the surface of the part. This eliminates the problem of feature extraction. We envision this as the core strategy of a new direct and …
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Process characterization of Electrical Discharge Machining of highly doped silicon
… wire or some other electrode) to a conductive workpiece. The electrode is physically separated from the workpiece by some small distance and the potential difference is commonly discharged through an insulating dielectric material such as deionized water or oil. This short duration application …
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Magnetic suspension and vibration control of flexible structures for non-contact processing
… can be facilitated by the ability to control workpiece motion without contact. This can be of significant utility in processes such as coating, painting, heat treating, and web handling. We develop a novel approach for the control of such non-contact suspensions through what we term sensor …
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The effect of abrasive properties on the surface integrity of ground ferrous materials.
… properties of alumina and CBN abrasives on workpiece temperatures in grinding was investigated. A review of the literature revealed a lack of knowledge of the thermal properties of CBN limiting the accuracy of theoretical predictions of the heat conduction in CBN grinding. A grain contact …
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Drilling of carbon fibre reinforced plastic composites
… drilling (6.35 mm diameter holes) in multilayer workpiece stacks comprising titanium, CFRP and aluminium. Machinability was assessed in terms of tool life/wear, force/torque, hole size and geometrical accuracy, workpiece surface integrity and chip morphology.
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ANALYSIS OF MACHINING PROCESS USING THE FINITE ELEMENT METHOD
… distribution of flow stress within the chip and workpiece is computed. Plastic and elastic tool-chip friction are accounted for. The distributions of tool-chip contact stresses and the cutting forces obtained in the present analysis agrees well with the experimental results of other researchers. …
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A robotic hand that utilizes ergonomic evaluation as feedback to improve human robot collaboration in soldering applications
… cannot adjust the position or orientation of the workpiece to suit a particular task which can cause workers to maintain unhealthy postures that are detrimental to their long-term health. This thesis addresses this shortcoming with a robotic arm that utilizes a gripper to grasp and hold a …
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Mathematical modelling of asymmetrical metal rolling processes
… asymmetries in roll size, roll speed and roll-workpiece friction conditions. The systematic procedure of asymptotic analysis makes this approach flexible to incorporating alternative friction and material models. A further generalisation of a clad-sheet workpiece is presented to illustrate …
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