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Adjustable cutting tool holder

Description: This patent application describes a device for varying the geometry of a cutting tool for use in machining operations.
Date: September 21, 2000
Creator: Steinhour, William Lee III; West, Drew; Honeycutt, Steve; Frank, Steven & Krishnamurthy, Kallutla
Partner: UNT Libraries Government Documents Department

Adaptive Control Optimization of Cutting Parameters for High Quality Machining Operations based on Neural Networks and Search Algorithms

Description: This book chapter presents an Adaptive Control with Optimization (ACO) system for optimising a multi-objective function based on material removal rate, quality loss function related to surface roughness, and cutting-tool life subjected to surface roughness specifications constraint.
Date: October 1, 2008
Creator: Abellan, J. V.; Romero, F.; Siller, H├ęctor R.; Estruch, A. & Vila, C.
Partner: UNT College of Engineering

Electrochemical machining

Description: The process of electrochemical machining is explained, tool configurations are shown, and examples of the type of work that can be done are given. Advantages of the process are discussed. (GHT)
Date: January 1, 1978
Creator: Fuller, J.E.
Partner: UNT Libraries Government Documents Department

Automated mask creation from a 3D model using Faethm.

Description: We have developed and implemented a method which given a three-dimensional object can infer from topology the two-dimensional masks needed to produce that object with surface micro-machining. The masks produced by this design tool can be generic, process independent masks, or if given process constraints, specific for a target process. This design tool calculates the two-dimensional mask set required to produce a given three-dimensional model by investigating the vertical topology of the model.
Date: November 1, 2007
Creator: Schiek, Richard Louis & Schmidt, Rodney Cannon
Partner: UNT Libraries Government Documents Department

Electrochemical deburring: another sharp sword in the battle with burrs

Description: In industry's continuing struggle with burrs, several cost reducing approaches have been largely overlooked. Electrochemical Deburring (ECD) is one of these processes. While this process has been used in the U.S. since 1962 and has been described briefly in over 100 publications, it has not received all the industry acceptance that most authorities feel it deserves. As the name implies, this is a process which uses both electricity and chemistry to remove burrs. It is a very fast process suitable to a wide range of metals. It is one of the few processes which does not require a tool which cuts, scrapes, abrades, or otherwise touches the burr. Some of its best applications are with materials or configurations which are not easily deburred by any other process.
Date: January 1, 1979
Creator: Gillespie, L.K.
Partner: UNT Libraries Government Documents Department

Agile machining and inspection thrust area team-on-machine probing / compatibility assessment of Parametric Technology Corporation (PTC) pro/CMM DMIS with Zeiss DMISEngine.

Description: The charter goal of the Agile Machining and Inspection Thrust Area Team is to identify technical requirements, within the nuclear weapons complex (NWC), for Agile Machining and Inspection capabilities. During FY 2008, the team identified Parametric Technology Corporation (PTC) Pro/CMM as a software tool for use in off-line programming of probing routines--used for measurement--for machining and turning centers. The probing routine would be used for in-process verification of part geometry. The same Pro/CMM program used on the machine tool could also be employed for program validation / part verification using a coordinate measuring machine (CMM). Funding was provided to determine the compatibility of the Pro/CMM probing program with CMM software (Zeiss DMISEngine).
Date: September 1, 2008
Creator: Wade, James Rokwel; Tomlinson, Kurt & Bryce, Edwin Anthony
Partner: UNT Libraries Government Documents Department

Analysis of interaction phenomena between liquid jets and materials

Description: The interaction phenomena of high-velocity liquid jets impinging on a material surface have been investigated theoretically and experimentally to gain an understanding of the physical mechanisms involved in material removal by fluidjet machining processes. Experiments were performed to determine conditions under which the liquid jet impacting a solid material will cause material removal and also to delineate possible physical mechanisms of mass removal at optimum jet-cutting conditions. We have also carried out numerical simulations of jet-induced surface pressure rises and of the material deformation and spallation behavior due to multiple droplet impacts. Results obtained from the experiments and theoretical calculations and their physical implications are also discussed.
Date: February 1, 1995
Creator: Kang, Sang-Wook; Reitter, T. & Carlson, G.
Partner: UNT Libraries Government Documents Department

Cleaning of Free Machining Brass

Description: We have investigated four brightening treatments proposed by two cleaning vendors for cleaning free machining brass. The experimental results showed that none of the proposed brightening treatments passed the swipe test. Thus, we maintain the recommendation of not using the brightening process in the cleaning of free machining brass for NIF application.
Date: December 29, 2005
Creator: Shen, T
Partner: UNT Libraries Government Documents Department

Cutting assembly

Description: A cutting apparatus includes a support table mounted for movement toward and away from a workpiece and carrying a mirror which directs a cutting laser beam onto the workpiece. A carrier is rotatably and pivotally mounted on the support table between the mirror and workpiece and supports a conduit discharging gas toward the point of impingement of the laser beam on the workpiece. Means are provided for rotating the carrier relative to the support table to place the gas discharging conduit in the proper positions for cuts made in different directions on the workpiece.
Date: January 28, 1982
Creator: Packi, D.J.; Swenson, C.E.; Bencloski, W.A. & Wineman, A.L.
Partner: UNT Libraries Government Documents Department

Cost effective machining and inspection of structural ceramic components for advanced high temperature application. Final CRADA report for CRADA number Y-1292-0151

Description: This Cooperative Research and Development Agreement (CRADA) was a mutual research and development (R and D) effort among the participants to investigate a range of advanced manufacturing technologies for two silicon nitride (Si{sub 3}N{sub 4}) ceramic materials. The general objective was to identify the most cost-effective part manufacturing processes for the ceramic materials of interest. The focus was determining the relationship between material removal rates, surface quality, and the structural characteristics of each ceramic resulting from three innovative processes. These innovated machining processes were studied using silicon nitride advanced materials. The particular (Si{sub 3}N{sub 4}) materials of interest were sintered GS-44 from the Norton Company, and reaction-bonded Ceraloy 147-3. The processes studied included the following activities: (1) direct laser machining; (2) rotary ultrasonic machining; and (3) diamond abrasive grinding, including both resinoid and vitreous-bonded grinding wheels. Both friable and non-friable diamond types were included within the abrasive grinding study. The task also conducted a comprehensive survey of European experience in use of ceramic materials, principally aluminum oxide. Originally, the effort of this task was to extend through a prototype manufacturing demonstration of selected engine components. During the execution of this program, however changes were made to the scope of the project, altering the goals. The Program goal became only the development of assessment of their impacts on product strength and surface condition.
Date: November 29, 1996
Creator: Abbatiello, L.A. & Haselkorn, M.
Partner: UNT Libraries Government Documents Department

Overcoming residual stresses and machining distortion in the production of aluminum alloy satellite boxes.

Description: Distortion frequently occurs during machining of age hardening aluminum alloys due to residual stresses introduced during the quenching step in the heat treatment process. This report quantifies, compares, and discusses the effectiveness of several methods for minimizing residual stresses and machining distortion in aluminum alloys 7075 and 6061.
Date: November 1, 2007
Creator: Younger, Mandy S. & Eckelmeyer, Kenneth Hall
Partner: UNT Libraries Government Documents Department

High-speed micro-electro-discharge machining.

Description: When two electrodes are in close proximity in a dielectric liquid, application of a voltage pulse can produce a spark discharge between them, resulting in a small amount of material removal from both electrodes. Pulsed application of the voltage at discharge energies in the range of micro-Joules results in the continuous material removal process known as micro-electro-discharge machining (micro-EDM). Spark erosion by micro-EDM provides significant opportunities for producing small features and micro-components such as nozzle holes, slots, shafts and gears in virtually any conductive material. If the speed and precision of micro-EDM processes can be significantly enhanced, then they have the potential to be used for a wide variety of micro-machining applications including fabrication of microelectromechanical system (MEMS) components. Toward this end, a better understanding of the impacts the various machining parameters have on material removal has been established through a single discharge study of micro-EDM and a parametric study of small hole making by micro-EDM. The main avenues for improving the speed and efficiency of the micro-EDM process are in the areas of more controlled pulse generation in the power supply and more controlled positioning of the tool electrode during the machining process. Further investigation of the micro-EDM process in three dimensions leads to important design rules, specifically the smallest feature size attainable by the process.
Date: September 1, 2005
Creator: Chandrasekar, Srinivasan Dr. (.School of Industrial Engineering, West Lafayette, IN); Moylan, Shawn P. (School of Industrial Engineering, West Lafayette, IN) & Benavides, Gilbert Lawrence
Partner: UNT Libraries Government Documents Department

Transport aspects of electrochemical machining and electrometallurgy

Description: Transport processes in large measure determine the rate at which electrolytic metal deposition and dissolution can be conducted. Unusually high rates, often accompanied by the formation of solid reaction products, are achieved in electrochemical machining by the use of high electrolyte flow velocities between closely-spaced electrodes. Geometrical shape and surface finish resulting from deposition or dissolution reactions are determined by the current distribution on a macroscopic and microscopic scale. Macroscopic current distributions have been determined experimentally by different electrical and optical means and are compared to theoretical expectations based on transport correlations and numerical models.
Date: May 1976
Creator: Muller, Rolf H.
Partner: UNT Libraries Government Documents Department

Forging Advisor

Description: Many mechanical designs demand components produced to a near net shape condition to minimize subsequent process steps. Rough machining from slab or bar stock can quickly and economically produce simple prismatic or cylindrical shapes. More complex shapes can be produced by laser engineered net shaping (LENS), casting , or forging. But for components that require great strength in mission critical applications, forging may be the best or even the only option. However, designers of these parts may and often do lack the detailed forging process knowledge necessary to understand the impact of process details such as grain flow or parting line placement on both the forging process and the characteristics of the forged part. Economics and scheduling requirements must also be considered. Sometimes the only viable answer to a difficult problem is to re-design the assembly to reduce loading and enable use of other alternatives.
Date: March 1, 2003
Creator: Barnett, Kerry
Partner: UNT Libraries Government Documents Department

Femtosecond laser materials processing

Description: Femtosecond lasers enable materials processing of most any material with extremely high precision and negligible shock or thermal loading to the surrounding area. Applications ranging from drilling teeth to cutting explosives to precision cuts in composites are possible by using this technology. For material removal at reasonable rates, we have developed a fully computer-controlled 15-Watt average power, 100-fs laser machining system.
Date: August 5, 1998
Creator: Stuart, B
Partner: UNT Libraries Government Documents Department

Relative sensitivity of formability to anisotropy

Description: This work compares the relative importance of material anisotropy in sheet forming as compared to other material and process variables. The comparison is made quantitative by the use of normalized dependencies of depth to failure (forming limit is reached) on various measures of anisotropy, as well as strain and rate sensitivity, friction, and tooling. Comparisons are made for a variety of forming processes examined previously in the literature as well as two examples of complex stampings in this work. 7 The examples rover a range from nearly pure draw to nearly pure stretch situations, and show that for materials following a quadratic yield criterion, anisotropy is among the most sensitive parameters influencing formability. For materials following higher-exponent yield criteria, the dependency is milder but is still of the order of most other process parameters. However, depending on the particular forming operation, it is shown that in some cases anisotropy may be ignored, whereas in others its consideration is crucial to a good quality analysis.
Date: January 1, 1997
Creator: Logan, R.W. & Maker, B.N.
Partner: UNT Libraries Government Documents Department

Gelcasting ceramic defense parts

Description: The goal of this work was to demonstrate an ability to gelcast and fire a particular defense-related part to net shape and to hold the required tolerances on size and shape with minimal or no post firing machining. The precision required represents a huge increase in the precision currently achievable by standard ceramic processing. The project has produced very promising results. While we did not achieve the degree of precision in as-fired parts that we had targeted ({+-}0.025%), we did improve our ability to hold tolerances to the {+-}0.25 level from our initial level of {+-}2.5 % on parts that were 5 to 10 inches in diameter. The progress to date makes us believe that the ultimate goal is achievable. We have demonstrated that gelcasting can be a viable precision forming technique for large articles. We are currently working with our industrial partner on a Statement of Work for a follow on project. This will be either a CRADA or a WFO project. The anticipated funding level is one person year in 1997 with funds coming from the industrial partner. Assuming reasonable progress is made in 1997, additional projects of similar size are expected in 1998 and out years funded either by the industrial partner or by DOD.
Date: October 1, 1997
Creator: Janney, M.A. & Jankiewicz, A.T.
Partner: UNT Libraries Government Documents Department

[Observation on machining speeds and feeds]

Description: This memorandum describes a trip on February 17th, 1944, in which the author stopped at the Baker Brothers Machine Company in Toledo to get the latest information on machining speeds and feeds and to determine the validity of their reported three pieces per hour per machine. The Baker Brothers reported that the three pieces per hour figure is an average given for determining delivery dates and allows for machining shapes other than a straight cylinder. They recommended a speed of 360 RPM for turning with a .010 feed.
Date: March 2, 1944
Partner: UNT Libraries Government Documents Department

Rapid Tooling via Investment Casting and Rapid Prototype Patterns

Description: The objective of this work to develop the materials processing and design technologies required to reduce the die development time for metal mold processes from 12 months to 3 months, using die casting of Al and Mg as the example process. Sandia demonstrated that investment casting, using rapid prototype patterns produced from Stereo lithography or Selective laser Sintering, was a viable alternative/supplement to the current technology of machining form wrought stock. A demonstration die insert (ejector halt) was investment cast and subsequently tested in the die casting environment. The stationary half of the die insert was machined from wrought material to benchmark the cast half. The two inserts were run in a die casting machine for 3,100 shots of aluminum and at the end of the run no visible difference could be detected between the cast and machined inserts. Inspection concluded that the cast insert performed identically to the machined insert. Both inserts had no indications of heat checking or degradation.
Date: June 1, 1999
Creator: Baldwin, Michael D.
Partner: UNT Libraries Government Documents Department