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S19 Usinagem dos Materiais |
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Title:
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MACHINABILITY OF THE PLASTIC INJECTION MOLD STEELS
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Summary :
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MACHINABILITY OF A CALCIUM TREATED PLASTIC INJECTION MOLD STEEL WAS EVALUATED AND COMPARED TO A SIMILAR CONVENTIONAL PLASTIC INJECTION MOLD STEEL, DURING OF END MILLING (CANALS) WITH TIN COATED CEMENTED CARBIDE TOOLS. CALCIUM TREATMENT PROVIDES A MORPHOLOGY CONTROL OF THE HARD AND ABRASIVE ALUMINA AND SILICON INCLUSIONS PRESENT IN EVERY STEEL OWING TO CONVENTIONAL DEOXIDIZATION PROCESS WITH ALUMINUM OR SILICON, CALCIUM CHANGES THEM TO A SOFTER AND ROUNDED INCLUSIONS, BESIDES CONTROLLING THE COMPOSITION OF THE OXIDE INCLUSIONS, MAKING THEM TO STAY IN A VISCOUS STATE DUE TO HIGH TEMPERATURES REACHED AT THE CHIP-TOOL INTERFACE DURING MACHINING. THE TESTS SHOWED A TOOL LIFE INCREASING UP 76 % WHEN USING THE CALCIUM TREATED STEEL WHEN COMPARED TO THE CONVENTIONAL STEEL.
KEY WORDS: MACHINABILITY, END MILLING, MOLD STEELS, CALCIUM TREATED MOLD STEELS, OXIDE INCLUSIONS.
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Author :
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Barbosa, Celso Antônio
Machado, Álisson Rocha
Milan, Júlio César Giubilei
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Paper View :
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