This thesis deals with analysing component manufacture of valve lines. Firstly evaluating current condition of production including determinated manufacture times and costs. Secondly carrying out inmprovement proposals for manufacture and optimalisation of cutting conditions while considering the minimal costs given for operation sections. The final provision summarizes results which were achieved and overall benefits of the thesis.

This thesis deals with the efficiency improvement proposal of production of engineering component for agricultural machine. Firstly, the current production proces is described including description of the component and determination of manufacture times. The next part contains efficiency improvement proposal of production including determination of manufacture times. The last chapter contains a comparison of both variants in terms of production costs. The final provision summarizes results which were achieved and overall benefits of the thesis.

Orientador: Maria Angela de Almeida Meireles / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos / Made available in DSpace on 2018-08-08T22:01:09Z (GMT). No. of bitstreams: 1 Vasconcellos_ClaudiaMonicaCabralde_M.pdf: 1343433 bytes, checksum: 8d0e348f337a691c19dd2508ad30b2f7 (MD5) Previous issue date: 2007 / Resumo: Neste trabalho foi estudado o comportamento cinético e custos de manufatura de extratos vegetais processados por tecnologia supercrítica. Foram determinados os parâmetros cinéticos do processo em diferentes condições de temperatura e pressão, foi avaliada a composição química dos extratos e foram estimados os custos de manufatura. Foram estudadas duas plantas: Achyrocline satureioides (Macela) e Vetiveria zizanioides (Vetiver). O custo de manufatura do óleo de vetiver apresentou grande influência do tempo de extração, apresentando-se menor para menores ciclos de extração. Devido ao alto investimento na planta de extração e baixo custo das matérias primas, era esperado que o mínimo custo de manufatura coincidisse com o tCER. Dessa forma, como no caso do vetiver parte significativa do extrato é obtida nos primeiros minutos de extração, os menores custos de manufatura ocorrem com os menores ciclos de extração. A estimativa de custos obteve resultados de custos a partir de US$ 24 / kg de extrato / Abstract: In this work, the kinetic behavior and manufacture costs of vegetal extract processed by supercritical technology were studied. The kinetic parameters of the process in different conditions of temperature and pressure were determined, the chemical composition of extracts was evaluated and the manufacture costs were estimated. Two plants were studied: Achyrocline satureioides (Macela) and Vetiveria zizanioides (Vetiver). The manufacture cost of the vetiver oil presented great influence of the extraction time, resulting in lower costs for lower extraction cycles. Due to the high required investment in the extraction plant and low cost of the raw material, it was expected that the minimum cost of manufacture coincided with the tCER. Thus, as considering vetiver extraction process significant part of the extract it is obtained in the first minutes of the process, the lower costs of manufacture occur with lower cycles of extraction. The estimate of manufacture costs resulted in values as low as 24 US$/kg of extract / Mestrado / Mestre em Engenharia de Alimentos