Valve Seat
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Heat Treatment of Sintered Valve Seat Inserts
The characterization of sintered valve seat inserts (VSIs) after being subjected to different heat treatment operations has been carried out. The VSIs were obtained from three different alloys by mixing iron powder with AISI M3:2, AISI M2 high-speed steels, and AISI D2 tool steel. After sintering, the VSI were quenched in air followed by double tempering at
Mat. Res.. Publicado em: 02/08/2018
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2. Study of the Machining of Intake Valve Seats of Internal Combustion Engines / Estudo da usinagem de sedes de válvulas de admissão de motores de combustão interna
As vibrações excessivas são frequentes na operação de rebaixamento de sedes de válvulas e levam o operador a reduzir a velocidade de corte ou o avanço, com prejuízo da produtividade. O objetivo deste trabalho foi estudar a usinagem das sedes de válvulas de admissão de um motor de combustão interna. As sedes são usinadas com ferramentas de PCBN a
Publicado em: 2009
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3. Large eddy simulation applied to reciprocating compressors
This paper considers the application of large-eddy simulation (LES) to predict the performance of hermetic reciprocating compressors utilized in refrigeration. In such devices the pressure difference between the suction/discharge chamber and the cylinder, established by the piston motion, is responsible for the valve opening. Once the valves are open, the fl
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-06
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4. "PROCESSAMENTO, USINAGEM E DESGASTE DE LIGAS SINTERIZADAS PARA APLICAÇÕES AUTOMOTIVAS" / "OBTENTION, MACHINING AND WEAR OF SINTERED ALLOYS FOR AUTOMOTIVE APPLICATIONS"
O objetivo deste trabalho foi desenvolver potenciais materiais para aplicações automotivas, em particular como insertos para assento de válvula em motores de combustão interna à gasolina. O desenvolvimento compreendeu as etapas de processamento dos materiais via metalurgia do pó, tratamento térmico, caracterização microestrutural e mecânica, usinag
Publicado em: 2006
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5. Compresibility and sinterability of HCx PM steel diluted with stainless steels
HCx powder metallurgy steel contains in its composition high contents of Cr and C, and significant quantities of alloy elements typical of tool steels (Mo, V, W), to provide the corrosion resistance of stainless steel with wear resistance of tool steels. HCx appears to be a suitable material for applications in aggressive environments, as valve seat inserts
Materials Research. Publicado em: 2003-12
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6. Chronic haemolysis after Lillehei-Kaster valve replacement. Comparison with the findings after Björk-shiley and Starr-Edwards mitral valve replacement.
Nineteen female and sixteen male patients who have had their heart valves replaced with Lillehei-Kaster valves were investigated for haemolysis four to 18 months after operation. Investigation included serum lactic dehydrogenase, serum haptoglobins, and urine haemosiderin. Red cells survival, using autologous red cells labelled with 51Cr, was measured in 12