Navegando por Data de Publicação, começando com "2005-09-29"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 2 de 2

Estratégias tecnológicas em cadeias de suprimentos da indústria automobilística brasileira: estudos de caso em empresas do segmento de motores de automóveis.
(Universidade Federal de São Carlos, 2005-09-29) Cerra, Aline Lamon; Alves Filho, Alceu Gomes; https://lattes.cnpq.br/7885557554922569
The prime objective of this work is to identify and analyze the technological strategies (TSs) of two car-engine assemblers and some of their first and second-tier suppliers, discussing the relations between the technological strategies of each assembler and its suppliers in each supply chain studied and, as a second objective, comparing the two sets (combinations) of technological strategies adopted in those chains. Two hypotheses were formulated: (1) The automotive assemblers set up in Brazil have different TSs regarding the development and production of engines; (1a) To each type of TS is assigned a necessary effort to maintain and develop the several technological capabilities, either internally or in partnership (together) with suppliers; (2) The sets of TSs in the chains are different. The technological strategies vary among the suppliers, and must be distinct the influences each assembler exerts on each supplier. To analyze such hypotheses, a literature review on the issues concerning this theme was carried out, as well as a field research. Such research comprised case studies in two chains, led by assemblers with distinct strategies, with different levels of vertical integration, representing distinct configurations. The case studies were conducted in the two assemblers and some of their suppliers (from the first and second tiers, in each chain), based on semi-structured interviews. The results indicate that, in general, the strategies undertaken by those assemblers are very similar and oriented towards local competitiveness. The differences occur as a result of their supply chain structures and their supplying policies. The assembler with a greater number of small-sized suppliers, with limited technological capabilities, must make a greater effort to develop them and to assure their adequate performance. The assembler with a greater number of large-sized suppliers, more technologically capable, must make a relatively bigger effort to negotiate (the transactions) with the suppliers, but a much lower effort to develop them. The technological strategies of the suppliers vary in the degree of ownership and technological complexity of product and process, as well as in the fact of transferring (or not) technological knowledge to their suppliers.
Estudo do critério de Niyama na formação de porosidade em fundidos de aço com distintos intervalos de solidificação
(Universidade Federal de São Carlos, 2005-09-29) Anselment, Ricardo Eugenio; Bolfarini, Claudemiro; https://lattes.cnpq.br/9231627080617037
This study concerns the analysis of the application of the Niyama Criteria as a tool to predict porosity formation on steel castings made from steel with different solidification gaps. Therefore, test coupons were project in order to allow porosity formation. The test coupons were simulated on the Magma Soft- Ware. The behaviour of temperature gradient, cooling rate, feeding and Niyama were analysed in the software as a function of the three plate thickness. The materials used in the simulation and foundry of the test plates were the carbon steel WCC class, the martensitic stainless steel CA6NM class and the corrosion resistant steel CA15 class. After the test coupons been casted, they were classified according to their material and cut in halves thru their middle. The faces along the test coupon length were milled in order to get accuracy on the analysis phase. The surfaces were inspected with dye penetrate test in order t determine the pore distribution along the profile. The pore location, size and incidence were that after compared to the simulation results. The analysis showed low pore incidence on the thinner test coupons. It also showed that the CA15 steel, which has the largest solidification interval presented fine, pores spread on an extensive area, more than expected from the Niyama criteria for lower values than 1. The steel with smaller solidification gaps showed pores with a larger dimension and more concentration. It was also evidenced the existence of analogy of porosity location and dispersion among the plate size of one material, nevertheless the size of the pore indication increases with the increases of the plate thickness.