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Investigation of Friction In Sheet Metal Forming

BROWSE_DETAIL_CREATION_DATE: 23-08-2017

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BROWSE_DETAIL_TYPE: Thesis

BROWSE_DETAIL_SUB_TYPE: EngD

BROWSE_DETAIL_PUBLISH_STATE: Unpublished

BROWSE_DETAIL_FORMAT: PDF Document

BROWSE_DETAIL_LANG: English

BROWSE_DETAIL_SUBJECTS: TECHNOLOGY, Manufactures,

BROWSE_DETAIL_CREATORS: Kalkan, Hakan (Author),

BROWSE_DETAIL_CONTRIBUTERS: Kaftanoğlu, Bilgin (Advisor),

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Friction, Deep drawing, Tribology


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Investigation of friction is carried out in the radial drawing region between the die and blank holder and also in the stretching zone over the punch in deep drawing. Two methods are developed to calculate the coefficient of friction in each zone using the experimentally determined data such as punch force diagrams and strain distributions obtained by an optical scanning system. The current methods differ from the existing techniques which are obtained in simulative tests. The proposed methods can be applied at room temperature and at elevated temperatures. In deep drawing tests, EN 10268 steel is used with dry and graphite lubrication and hot deep drawing tests are performed at . Deep drawing tests are performed at different lubrication and temperature conditions. Blank holder load is another parameter which changes the punch loads. 9 different stretch forming tests are performed to determine the coefficient of friction in this zone. Three different materials are used with dry and paraffin lubricated conditions. Comparisons of friction coefficients are made with those obtained by other techniques.


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