Extrusion Flashcards
What is extrusion?
Extrusion is used to create objects of a fixed cross section. A material is pushed through a die of the desired cross section. It can be done when the material is hot or cold
What materials are extruded?
Metals, plastics, ceramics, concrete and play dough are extruded.
What is the process of extrusion?
The material is heated and loaded into the container in the press. A dummy block is then placed behind it where the ram then presses on the material to push it out of the die.
What are the advantages of extrusion?
It is low cost compared to their moulding processes. It mainly uses thermoplastics which can melt and harden. Left over material can be reused which means there is no wastage.
What are the disadvantages?
It can be a problem guessing the expansion of the plastic and eliminates this method for precision parts manufacturing . Also there is a limit on what kind of products that can be manufactured.
What is the difference between extrusion and injection moulding?
Extrusion is a method in which molten plastic or any other material is pushed through two dimensional die openings. Where as injection moulding is based on the molten die casting method
