Answer true or false (20 points) 1) Extrusion is process is generally carried ou

Question

Answer true or false (20 points) 1) Extrusion is process is generally carried out at increasing temperature. Extrusion and drawing processes can cause external and internal defect in the material. 3) Extrusion process at low temperature and speed will cause surface cracking and tearing 4) the cost of the extrusion materials and operations are expensive for small volume 5) Billets are square and later are used into various shapes such as strips or plates 6) Pipes and tubing are typical products made by extrusion process. 7) Extrusion has a good surface finish. 8) The process of extrusion and solidification of continuous filaments is called spinning 9) Thermoforming is a process for forming thermoplastic sheets or films over a mold through the application of heat and pressure. 10) Plastics in general can be molded, cast, formed, and machined into complex shapes in few operations, with relative ease, and at high production rates

Explanation / Answer

1)FALSE. Reason: Extrusion also carried out at room temperature called cold extrusion. Materials that are commonly cold extruded include: lead, tin, aluminum, copper etc.

2)TRUE. Reason: Various defects:Surface cracking (also called hot shortness), Pipe defect (also called tailpipe or fishtailing),Internal cracking (also called center-burst, chevron cracking).

3)TRUE. Reason: Friction forces increases.

4)TRUE. Reason:extrusion process is generally economical when producing large amount of parts.

5)TRUE. Reason:billet is a length of metal that has a round or square cross-section, with an area less than 230 cm2.

6)TRUE

7)TRUE

8)FALSE. Reason:metalworking process by which a disc or tube of metal is rotated at high speed and formed into an axially symmetric part.

9)TRUE. Reason:Thermoforming is a manufacturing process where a plastic sheet is heated to a pliable forming temperature, formed to a specific shape in a mold, and trimmed to create a usable product.

10)TRUE. Reason: Due too easy formability, strength

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