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.
Results
Showing 1 to 14 of 14 for “"machining time"”.
-
Automatic tool path generation for the rough machining of dies and molds.
… a prototype knowledge-based system for the rough machining of sculptured surfaces on dies and molds is presented. The system first decomposes a designed part into a number of parallel layers normal to the z-axis and determines the shape of the part at each of these layers. Then, a geometric …
-
A Comparative Study on Micro Electro-Discharge Machining of Titanium Alloy (TI-6AL-4V) and Shape Memory Alloy (NI-TI)
… surface modifications that take place during the machining of NiTi SMA and Ti-6Al-4V with micro-EDM. This was done by creating an array of blind holes and micro-patterns on both work-pieces. To analyze the machined surface and investigate the results, scanning electron microscope (SEM), energy …
-
Automatic generation of optimal process plans for machined parts from 3D solid models
… part is presented. This method first recognizes machining features from the solid model of the part by recursive volume decomposition (RVD). An RVD method has been developed in this research to solve the computational complexity of the earlier volume decomposition method. This RVD method quickly …
-
Development of a Five-Axis Machining Algorithm in Flat End Mill Roughing
<p>To further the research done in machining complex surfaces, Jensen [1993] developed an algorithm that matches the normal curvature at a point along the surface with the resultant radius formed by tilting a standard flat end mill. The algorithm called Curvature Matched Machining (CM2) is faster …
-
Variations in the manufacturing of Rockwell test blocks
… of the workers. Improvements suggested in the machining plan could lead to reduction in machining time at grinding operation by as much as 13%.
-
Reducing Curvature in Complex Tool Paths by Deviating from CAM-Produced Tool Paths Within a Tolerance Band
… tool paths for complex parts to achieve shorter machining times resulting in higher production rates. In the research sample cases, the algorithm decreased machining times by 1% to 9% for design-induced sections of high curvature and by 16% to 75% for CAM induced ripples using high path …
-
Mechanical design of a desktop milling machine for fabrication in an introductory machining class by Johannes Schneider.
… alternative class project in MIT's introductory machining course 2.670. This research is important, because a well-designed introductory machining course has the potential of inspiring students early-on in their academic lives to learn about and become familiar with the principles of precision …
-
Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology
… Further efforts to save on material use and machining time have focused on the use of additive manufacturing. However, anisotropic properties can be caused by both the HCP structure of magnesium alloys as well as by layered effects left by typical additive manufacturing processes. Additive …
-
Fabrication of high-quality microflexures using micromilling techniques
… micromilled from various aluminum alloys. Total machining time, including setup and tool changes, was around 1.5 hours per part. The integrity of each part was verified using optical microscopy and white-light interferometry to inspect for any microcracks or otherwise unfavorable by-products of …
-
Time-optimal CNC tool paths : a mathematical model of machining
Free-form surface machining is a fundamental but time-consuming process in modern manufacturing. The central question we ask in this thesis is how to reduce the time that it takes for a 5-axis CNC (Computer Numerical Control) milling machine to sweep an entire free-form surface in its finishing …
-
Smart Drilling: A computer-based system for planning drilling operations.
… four modules: (1) Tool selection module, (2) Machining condition design module, (3) NC code generation module, and (4) Simulation module. In the tool selection module, a generative searching and planning algorithm is applied. Fuzzy logic was utilized to make decisions in tool selection. The …
-
Virtual three-axis milling process simulation and optimization
… precision and accuracy in the first attempt at machining. A physics-based comprehensive modeling of the machining processes is a fundamental requirement in identifying optimal cutting conditions which result in high productivity rates without violating accuracy throughout the part production …
-
Virtual five-axis flank milling of jet engine impellers
… engine and are costly, difficult to machine, and time-consuming to manufacture. To improve the productivity of the flank milling operations, a procedure to predict and optimize the cutting process is proposed. The contributions of the thesis include a novel cutter-workpiece engagement calculation …
-
An application protocol for near net shape technologies implementation
… can dramatically reduce costs and lead times in established manufacturing processes. However identifying candidate NNS processes and optimizing their implementation is frequently done in an adhoc manner without the benefits of a structured process of discovery and assessment. Motivated …