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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

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 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

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

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

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

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

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

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

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

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 1, 1976
Creator: Muller, R. H.
Partner: UNT Libraries Government Documents Department

Evaluation of Internal Brushing on Pinch Weld Quality

Description: Post machining operations such as borescope inspection can cause linear indications down the length of the bore of fill stems. Often these indications are removed or obscured using rotary wire brushing. This study evaluated the effect this mechanical operation may have on pinch weld quality when relatively cold welds were made. A total of four stems with two levels of brushing of both Type 304L and 21-6-9 stainless steels were tested. In addition, two each of the Type 304L stems were Nitradd cleaned and the other two were aqueously cleaned; all four 21-6-9 stems were aqueously cleaned. All of the brushed stem areas exhibited more surface anomalies based on borescope evaluation. On average, the bond rating was a higher value (worse) for the brushed areas than the unadulterated areas for both Type 304L and 21-6-9 stems. The test method used may have biased the results towards a lesser quality bond for the brushed areas so additional testing is recommended.
Date: December 1, 2005
Creator: Korinko, P
Partner: UNT Libraries Government Documents Department

Aluminum alloys for satellite boxes : engineering guidelines for obtaining adequate strength while minimizing residual stresses and machining distortion.

Description: This report provides strategies for minimizing machining distortion in future designs of aluminum alloy satellite boxes, based in part on key findings from this investigation. The report outlines types of aluminum alloys and how they are heat treated, how residual stresses develop during heat treatment of age hardening alloys, ways residual stresses can be minimized, and the design of machining approaches to minimize distortion in parts that contain residual stresses. Specific recommendations are made regarding alloy selection, heat treatment, stress relieving, and machining procedures for boxes requiring various strength levels with emphasis on 6061 and 7075 aluminum alloys.
Date: November 1, 2007
Creator: Younger, Mandy S. & Eckelmeyer, Kenneth Hall
Partner: UNT Libraries Government Documents Department

Deterministic processing of alumina with ultra-short laser pulses

Description: Ultrashort pulsed lasers can accurately ablate materials which are refractory, transparent, or are otherwise difficult to machine by other methods. The typical method of machining surfaces with ultrashort laser pulses is by raster scanning, or the machining of sequentially overlapping linear trenches. Experiments in which linear trenches were machined in alumina at various pulse overlaps and incident fluences are presented, and the dependence of groove depth on these parameters established. A model for the machining of trenches based on experimental data in alumina is presented, which predicts and matches observed trench geometry. This model is then used to predict optimal process parameters for the machining of trenches for maximal material removal rate for a given laser.
Date: June 27, 2007
Creator: Furmanski, J; Rubenchik, A M; Shirk, M D & Stuart, B C
Partner: UNT Libraries Government Documents Department

Rapid Response Small Machining NNR Project 703025

Description: This project was an effort to develop a machining area for small sized parts that is capable of delivering product with a quick response time. This entailed focusing efforts on leaning out specific work cells that would result in overall improvement to the entire machining area. This effort involved securing the most efficient available technologies for these areas. In the end, this incorporated preparing the small machining area for transformation to a new facility.
Date: December 5, 2008
Creator: Kanies, Tim
Partner: UNT Libraries Government Documents Department