MM98.43 Experimental determination of the heat transfer coefficient Under dynamic process conditions in backward can extrusion

Poul Henningsen, Jesper Henri Hattel, Tarras Wanheim

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    The large deformations in backward can extrusion result in a rise of temperature of more than 200 oC. In the experiments, cans in low carbon steel are formed with a lubrication layer of phosphate soap. The temperature is measured by thermocouples in the die insert and the punch. The die insert is divided into two halves where the thermocouples are welded to the end of milled grooves in the lower part. The temperature of the workpiece is measured by welding a thermocouple directly onto the free surface. The punch is equipped with three thermocouples mounted at a distance of 0.2 mm from the surface. The thermocouples are welded to the end of grooves milled in a small plug, which is pressed into a hold in the punch nose. All the temperature measurements in the tool and the workpiece are compared with a number of finite element (FE) simulations computed with different heat transfer coefficients. The current heat transfer coefficient (HTC) is then determined by the least square method
    Original languageEnglish
    Title of host publicationModelling of structure and Mechanics of Materials from Microscale to Product
    PublisherRisø National Laboratory
    Publication date1998
    Publication statusPublished - 1998
    Event19th Risø International Symposium on Materials Science - Risø, Roskilde, Denmark
    Duration: 7 Sep 199811 Sep 1998


    Conference19th Risø International Symposium on Materials Science

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