The Sheared Edges Characterization of High Strength Steel Sheet Metal DP590 in Warm Blanking Process
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Abstract
This research aims to study the effect of metal sheets temperature and die-cutting clearance on the cutting edge quality of the finished product by the blanking operation of AHSS Dual Phase steel DP590 sheets. The shearing tests were carried out on an in blanking die by 3 size of punch–die clearance. Before the blanking test, the sheet metal is heated in an electric furnace at 4 temperature levels. To analyze finished product cutting edge quality ware consider the examined results by the optical microscopy and scanning electron microscope. The strain hardening behavior on the cutting edge was evaluated and analyzed with the micro-hardness tested results by a Vickers hardness tester. The experiment results showed that the sheet metal shearing at room temperature resulted in a high fracture region on the cutting edge. The beginning of micro-cracks occurs in the early stages of press blanking and is larger as increased of the punch and die clearance. However, the height of the fracture region tends to decrease as the sheet metal temperature increases and the die clearance decreases. In the examination results of the fracture surface characteristics and micro-hardness values, it was found that when the sheet metal temperature increased, the fracture surface had the appearance of ductile fracture because the material had a low strain hardening index. The results of this research can be applied to determine the optimum conditions for sheet metal blanking of high-strength steel sheets. That is determined by the relationship between sheet metal temperature and die clearance, which directly affects the quality of the finished cutting edge.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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