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Pressure Fed Edm
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US $69.99
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NEW AIR PAINT SPRAY GUN - GRAVITY FEED TYPE - SPRAYER Sale Price: $12.99  |
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BRAND NEW - GRAVITY FEED High Pressure AIR Paint Spray Gun! A great item to go along with your air compressor! Features: Cup Size = 600ml Nozzle Size = 1.5 mm Feed Type: GRAVITY Air pressure at inlet: 3.5 - 5 bar Air INLET: 1/4" NPT or BSP Air HOSE (ID): 3/8" Very Nice Chrome Paint Sprayer! |
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Tungsten Carbide, essentially a powdered metal comprising the elements of tungsten and carbon, has long been used for mechanical components in applications requiring wear resistance, erosion resistance, toughness, and compressive strength; such as in mechanical shaft seals, pump bearings, valve trim, down hole oil and gas tools for the Oil and Gas, Petrochemical, Energy, and other industries. But what makes Tungsten Carbide perform so well in these applications are some of the same characteristics that make incorporating the material into mechanical designs more challenging-from both a mechanical and a cost perspective.
Unlike metals, Tungsten Carbide does not lend itself to common fabrication methods such as welding, nor common attachment methods such as threading and bolting. The material cannot be welded, and threading it requires costly grinding or EDM operations. Furthermore, as the material will not yield-instead fracturing when its transverse rupture strength is exceeded-bolting becomes a mechanical challenge. Further exacerbating design challenges is Tungsten Carbide's mass, which is greater than two times that of 4140 steel.
To address issues of fabrication, assembly, mass, and processing costs, designers have utilized several joining processes to attach Tungsten Carbide to another primary component or to a transitory metal component such as a threaded insert; among these attachment methods are brazing, gluing (typically with high-solids epoxies), and shrink-fitting. While each of these methods of attachment has its place, if the parts are round, as with mechanical seal faces, valve trim, and many down-hole tools, shrink-fitting offers the broadest range of mechanical function.
Shrink-fitting Tungsten Carbide components into mating metallic components is a process by which the metallic component is heated to expand its bore beyond the diameter of the Carbide components, and upon returning to room temperature results in a gripping force typically described as "interference". Among the design considerations for the interference joint between the Carbide and metallic component are operating temperature, differential pressures, and the mechanical properties of the alloy used.
For those new to designing for Tungsten Carbide components and assemblies, this serves as the briefest introduction. Service, design, and cost considerations are myriad, and your qualified Tungsten Carbide manufacturer can assist in designing for satisfactory service and lowest practical costs.
Penn United Carbide, a full-service manufacturer of Carbide and metallic components, offers design assistance to successfully incorporate Tungsten Carbide into your most challenging or most basic designs for drilling tools, control components and valves, pumps, compressors, or other equipment requiring high wear and/or erosion resistance. From raw carbide materials to finished parts and assemblies, Penn United Carbide controls the entire manufacturing process. At Penn United Carbide, "Manufacturing Solutions-Absolute Integrity" isn't just our slogan, it's our way of life. Please visit our website at http://www.PennUnited.com or contact us at (724) 352-5151. Rick Pollick is the Manager of Strategic Marketing at Penn United Technologies, Inc. in Cabot, PA.
Wire EDM Services
Wire EDM services are not exactly new technology. The concept was originally discovered in the 1770's by an English Scientist. It was not until the 1970's that EDM was commercially developed, and in the 1980's began to be distributed and utilized through the world of machine shops.
Wire EDM (Electrical Discharge Machining) is an electro thermal production process that removes metal in a very precise manner by harnessing the heat of an electrical spark. Precision wire (typically brass) is fed continuously from a spool through precision diamond guides, one above and one below the work piece. As the wire is fed it is energized with electricity. The work piece to be machined, which must be a conductive material, is grounded. The EDM machine moves the wire (or the table holding the work piece) in the path that is to be cut. As the wire nearly touches the work piece, sparks begin to jump between the wire and work piece in an extremely fast, very controlled manner. The sparks are microscopic and each spark removes a very microscopic piece of material. Millions of sparks per second are constantly removing material so that the wire appears to be cutting through the work piece material, leaving a gap or cut path behind it slightly larger than the wire and in whatever path the wire is programmed to move through the work piece material. Dielectric water is fed constantly over the wire and into the gap which cools and flushes out the microscopic melted particles. The used wire, which appears microscopically pitted, is taken up on a spool or chopped into short pieces to be sold to a metal recycling facility.
The most common wire size used in EDM is.010" diameter. The sparks themselves actually take up space, causing the curf or cut of the wire to be larger than the wire itself. A.010" diameter wire might leave a cut anywhere from.0106 to.014 wide, depending on the amount of energy used to make the cut. The more energy used to make the cut, the faster the wire travels, and the less precise the cut path is.
Companies offering wire EDM services have a variety of equipment and options to choose from. Mitsubishi, Agie, Charmilles, and Sodik are all major brands of wire EDM machines. Many of these machines will run multiple wire sizes ranging from.0012" diameter to.012" diameter. The smaller wire sizes allow companies to do micro machining and very small and complex parts. Wire EDM is capable of producing a wide range of surface finishes. At the rough end of the scale the finishes start around 250 Ra microinch ( μ" ) and by use of multiple trim passes can go down to 4 Ra microinch ( μ" ). Many EDM machines can tilt the wire, allowing them to make parts that have a tapered shape. Wire EDM machines are also capable of cutting and threading the wire automatically, allowing the machines to be programmed to make multiple cuts in a part without operator intervention. A hollow stream of water is shot at high pressure from the top wire guide to the bottom, and the wire is fed down through this stream until the rollers in the bottom head pick up the wire and beginning pulling it. With all of these automatic features built into the machines, companies offering wire EDM services often run their machines at night unattended on long cuts.
Many industries benefit from wire EDM services. The medical and electronics industries both often have applications for micro wire EDM services. EDM machines are often used in the production of extrusion dies, punch dies, and even plastic injection mold work. The automotive, aerospace, defense, textiles, and many other industries all use parts that must be built on wire EDM machines. Wire EDM today has truly become a main stream production process.
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