Preliminary Report on Coining of Targets

Davis, P ; Wall, M ; Hodge, N ; Schwartz, A

Lawrence Livermore National Laboratory

关键词: Diamonds;    Processing;    36 Materials Science;    Production;    Grinding;   

DOI  :  10.2172/15014598
RP-ID  :  UCRL-TR-205723
RP-ID  :  W-7405-ENG-48
RP-ID  :  15014598

美国|英语

来源: UNT Digital Library

【 摘 要 】

We were tasked with developing a coining technique that would evaluate the feasibility of using a pressing, or coining process to imprint a one-dimensional sinusoidal pattern onto a thin disk specimen. We performed finite element method simulations of the coining process, designed, built, and tested a coining apparatus and tested surrogate materials, and coined a sample of special nuclear material. The preliminary results were encouraging. The pressing of a 3-mm diameter by {approx}100 {micro}m thick disc to 500 pounds of pressure produced a flat part with a 1-{micro}m deep by 50-{micro}m period sine wave pattern covering all of the surface and thus demonstrated the method for replicating ultraprecision, mesoscale features onto a near-net-shape metallic blank. This coining technique is being developed to provide specialty processing for the manufacturing of difficult to machine, millimeter-size components made from materials that present hazardous conditions. The technology is versatile and can be used to imprint a wide range of features, or profiles into two opposing surfaces. The coining process requires a simple, conceivably hand held tool, which efficiently produces ultra-precision work pieces without the production of byproducts such as machining chips, or grinding swarf. It shows promise for use on ductile materials that cannot be precision machined with conventional single crystal diamond tooling. As a production process, it can be used to reduce manufacturing costs where large numbers of ultra-precision, repetitive designs are required.