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5987 |
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Tuesday, May 21, 2019, Saal Brüssel 1:00 PM Brazing for tool applications |
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Effect of minimizing the thickness of the copper intermediate layer in carbide tipped tools on the shear strength of the brazed joint |
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Max Schimpfermann* / SAXONIA Technical Materials GmbH, Germany Michael Magin / CERATIZIT Luxembourg S.à r.l., Luxembourg Sven Rassbach/ CERATIZIT Luxembourg S.à r.l., Luxembourg |
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Modern tools are usually provided with hard metals to meet the machining-specific tasks in later use. The tool manufacturing industry uses a wide variety of cemented carbides, for example as a saw tip for circular saw blades in the metal- or woodworking industry. Saw blades are usually brazed by means of induction brazing at atmosphere, using low-melting silver based filler metals. A cracking of the cemented carbide during following final processing and also during the application. In the manufacturing process, therefore, the correct choice of flux, filler metal types and filler metal geometries as well as the corresponding brazing process parameters are the decisive factors for a high product quality. In consequence of increasing product and process optimization, the amount of materials in general and thus also the quantity of brazing special form are sandwich brazing alloys, which additionally contain a stress-reducing copper intermediate layer to reduce the risk of filler metals in particular is challenged. In this context the possibilities of the optimization of the amount of applied sandwich filler metals by reducing the copper interlayer thickness is one question, which has to be answered. For this reason, this paper investigates the degree to which a reduction in the copper interlayer thickness of a cemented carbide steel joint has a significant influence on the central product properties, such as shear strength or stress levels in the joint as well as in the base materials. Corresponding theoretical approaches were determined by means of simulations and practically tested on brazed tools by measuring the shear strength. |