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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Konceptframtagning av utstötarbord

Engman, Dennis, Åström, Simon January 2018 (has links)
Metso Ersmark develop and manufacture rubber liners for mining mills. When making these rubber liners, large molds are placed in the furnaces. The molds are filled with rubber and metal parts which then are vulcanized together under pressure and heat. When the vulcanize process is completed, the mold is taken out on a so-called ejection table. The table has the task of pushing out the details of the molds using jacks and placing the molds at an ergonomic working height for the production staff before and after the vulcanization process.   The aim of this graduation project is to develop a concept on a table with lifting device to reach the upper floor of the production furnace, a locking function of the ejection table when pressing out the rubber liner and increase the stroke length of the ejector function. Today there is two already existing ejection tables in Metso's production that are useful for this project,  12-54 and 12-39. These have been sources of inspiration for this work and a CAD model of 12-54 has been the basis for the final result.   The concept was modeled in Inventor and calculations were performed to ensure the strength. The result was a table similar to 12-54 but with a longer stroke on the ejector function, wider table surface to enable a scissor lift, scissor lift as a lifting device and locking in the bottom position to relieve the scissor lift during loosening of the rubber lining. The goal in this project was reached, except that calculations was not made for the table lifting device. A concept of a scissor lift adapted for the table was drafted for a visual result, but detailed job to ensure its function was not made. Metso Ersmark develop and manufacture rubber liners for mining mills. When making these rubber liners, large molds are placed in the furnaces. The molds are filled with rubber and metal parts which then are vulcanized together under pressure and heat. When the vulcanize process is completed, the mold is taken out on a so-called ejection table. The table has the task of pushing out the details of the molds using jacks and placing the molds at an ergonomic working height for the production staff before and after the vulcanization process.   The aim of this graduation project is to develop a concept on a table with lifting device to reach the upper floor of the production furnace, a locking function of the ejection table when pressing out the rubber liner and increase the stroke length of the ejector function. Today there is two already existing ejection tables in Metso's production that are useful for this project,  12-54 and 12-39. These have been sources of inspiration for this work and a CAD model of 12-54 has been the basis for the final result.   The concept was modeled in Inventor and calculations were performed to ensure the strength. The result was a table similar to 12-54 but with a longer stroke on the ejector function, wider table surface to enable a scissor lift, scissor lift as a lifting device and locking in the bottom position to relieve the scissor lift during loosening of the rubber lining. The goal in this project was reached, except that calculations was not made for the table lifting device. A concept of a scissor lift adapted for the table was drafted for a visual result, but detailed job to ensure its function was not made. Metso Ersmark develop and manufacture rubber liners for mining mills. When making these rubber liners, large molds are placed in the furnaces. The molds are filled with rubber and metal parts which then are vulcanized together under pressure and heat. When the vulcanize process is completed, the mold is taken out on a so-called ejection table. The table has the task of pushing out the details of the molds using jacks and placing the molds at an ergonomic working height for the production staff before and after the vulcanization process.   The aim of this graduation project is to develop a concept on a table with lifting device to reach the upper floor of the production furnace, a locking function of the ejection table when pressing out the rubber liner and increase the stroke length of the ejector function. Today there is two already existing ejection tables in Metso's production that are useful for this project,  12-54 and 12-39. These have been sources of inspiration for this work and a CAD model of 12-54 has been the basis for the final result.   The concept was modeled in Inventor and calculations were performed to ensure the strength. The result was a table similar to 12-54 but with a longer stroke on the ejector function, wider table surface to enable a scissor lift, scissor lift as a lifting device and locking in the bottom position to relieve the scissor lift during loosening of the rubber lining. The goal in this project was reached, except that calculations was not made for the table lifting device. A concept of a scissor lift adapted for the table was drafted for a visual result, but detailed job to ensure its function was not made. / Metso Ersmark utvecklar och tillverkar gummiinfodringar till gruvkvarnar. Vid tillverkning av dessa gummikonstruktioner används stora formar som placeras i ugnar. Formarna fylls med gummi och metalldelar som sedan vulkas ihop under tryck och värme. När vulkningsprocessen är klar tas formen ut på ett så kallat utstötarbord. Borden har i uppgift att med hjälp av domkrafter trycka ut detaljerna ur formarna samt att placera formarna på en ergonomisk arbetshöjd för produktionspersonalen innan och efter vulkningsprocessen. Målet med detta examensarbete är att ta fram ett konceptförslag på ett bord med lyftanordning för att nå det övre etaget i tillverkningsugnen, en låsfunktion av utstötarbordet vid plundring av tillverkningsform samt öka slaglängden för utstötarfunktionen. Idag finns bland annat utstötarbord 12-54 och 12-39 i Metsos produktion. Dessa har varit inspirationskällor till arbetet och en CAD-modell av 12-54 har legat till grund för slutresultatet. Konceptet modellerades i Inventor och beräkningar utfördes för att säkerställa hållfastheten. Resultatet blev ett bord likt 12-54 men med längre slaglängd på utstötarfunktionen, bredare bordsyta för att möjliggöra montering av saxlyft, saxlyft som lyftanordning samt låsning i bottenläge för att avlasta saxlyften vid plundring. Målet med arbetet uppfylldes till största del, dock utfördes inga beräkningar på bordets lyftanordning. Ett koncept på en saxlyft anpassat för bordet ritades upp för ett visuellt resultat men övrigt arbete för dess funktion behandlades inte.

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