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Advisor(s)
Abstract(s)
A utilização de ferramentas de corte progressivo tem vindo a aumentar exponencialmente pois são ferramentas capazes de produzir uma grande quantidade de componentes num curto período de tempo. Outra grande vantagem é a sua versatilidade, pois são ferramentas que se adaptam facilmente a qualquer máquina, sendo então possível dispor apenas de uma só máquina para a utilização de várias ferramentas. A empresa JSL – Material Elétrico tem tido, ao longo dos últimos 5 anos, um aumento de vendas no que diz respeito às caixas de aparelhagem para pladur. Os componentes metálicos nela inseridos, denominados por garra de pladur, são produzidos de uma forma trabalhosa e com custos excessivos. A necessidade de melhoria deste processo tem vindo a ser demonstrada com a necessidade de uma maior produção. Este trabalho teve como objetivo desenvolver e avaliar uma ferramenta de corte progressivo capaz de produzir roscas integralmente, com base numa só operação. O processo tem como finalidade aumentar a produção de um componente metálico que pertence a uma caixa de aparelhagem para paredes de pladur. Anteriormente, era produzido através de estampagem e de uma roscagem independente com uma cadência de cerca de três vezes menos relativamente à ferramenta de corte. Utilizando uma só ferramenta de corte capaz de efetuar rosca internamente, tornou possível o aumento a produção desta peça. Desenvolveu-se a ferramenta com a sequência de operações com base na ferramenta utilizada anteriormente. Aplicou-se uma caixa de engrenagens, com base em dois fusos, que transmitem rotação aos machos. A ferramenta, ao fechar, os machos rodam no sentido dos ponteiros do relógio (atarraxar) e, ao abrir, rodam no sentido oposto para desatarraxar. Após uma série de melhorias ao projeto, realizaram-se diversas produções já com rosca. Assim, a produção diária alterou de 30000 para 115200 unidades. É de extrema importância, referir que os custos diminuíram, dado ter-se passado a utilizar apenas uma máquina.
The use of progressive cutting tools has been increasing exponentially as they are tools capable of producing a large quantity of components in a short period of time. Another great advantage is their versatility, as they are tools that easily adapt to any machine, making it possible to have just one machine to use several tools. Over the last 5 years, the company JSL – Material Elétrico has seen an increase in sales in terms of drywall equipment boxes. The metallic components inserted into it, called garras de pladur, are produced in a laborious and expensive way. The need to improve this process has been demonstrated with the need for greater production. This work aimed to develop and evaluate a progressive cutting tool capable of producing threads entirely, based on a single operation. The purpose of the process is to increase the production of a metallic component that belongs to a device box for drywall walls. Previously, it was produced through stamping and independent threading with a rate of around three times less compared to the stamping tool. Using a single stamping tool, capable of internally threading, production will increase by approximately three times. The tool was developed with the sequence of operations based on the previously used tool. A gearbox was applied, based on two spindles, which transmit rotation to the taps. The tool, when closing, the taps turn clockwise (screwing) and, when opening, they turn in the opposite direction to unscrew. After a series of improvements to the project, several productions were carried out with threads. Thus, daily production changed from 30,000 to 96,000 units. It is extremely important to note that costs have decreased, as only one machine is used.
The use of progressive cutting tools has been increasing exponentially as they are tools capable of producing a large quantity of components in a short period of time. Another great advantage is their versatility, as they are tools that easily adapt to any machine, making it possible to have just one machine to use several tools. Over the last 5 years, the company JSL – Material Elétrico has seen an increase in sales in terms of drywall equipment boxes. The metallic components inserted into it, called garras de pladur, are produced in a laborious and expensive way. The need to improve this process has been demonstrated with the need for greater production. This work aimed to develop and evaluate a progressive cutting tool capable of producing threads entirely, based on a single operation. The purpose of the process is to increase the production of a metallic component that belongs to a device box for drywall walls. Previously, it was produced through stamping and independent threading with a rate of around three times less compared to the stamping tool. Using a single stamping tool, capable of internally threading, production will increase by approximately three times. The tool was developed with the sequence of operations based on the previously used tool. A gearbox was applied, based on two spindles, which transmit rotation to the taps. The tool, when closing, the taps turn clockwise (screwing) and, when opening, they turn in the opposite direction to unscrew. After a series of improvements to the project, several productions were carried out with threads. Thus, daily production changed from 30,000 to 96,000 units. It is extremely important to note that costs have decreased, as only one machine is used.
Description
Trabalho de projeto para obter o grau de Mestre em Engenharia Mecânica
Keywords
Corte progressivo punção/matriz Estampagem Roscagem Prensa mecânica Progressive blanking Punch/die Stamping Threading
Citation
Castro, José Maria Andrade Gil Borges de - Desenvolvimento e avaliação de uma ferramenta progressiva de corte e estampagem, com sistema de roscagem, para a produção de componentes do setor elétrico. Lisboa: Instituto Superior de Engenharia de Lisboa, 2023. Dissertação de Mestrado