Search

8 Sep 2001: Economics. The production speed is limited by opening and closing the mould, so automation is normally used.

8 Sep 2001: Economics. Cycle time is limited by heating and cooling of the sheet.

8 Sep 2001: Economics. Production rates and costs strongly depend on the type of process and the size of component.

8 Sep 2001: Overview. Prototyping is the making of a test component before full manufacture begins.

8 Sep 2001: Economics. Production rate is limited by the insertion and removal of the blank, so some form of automation is often used.

8 Sep 2001: Some scrap is always produced and cannot be directly recycled. Economics.

8 Sep 2001: Economics. If possible, avoid cutting! A surprising number of designs involve a cutting process followed by a joining process.

7 Sep 2001: it is the same whatever the size of the test-piece. Many applications require stiff materials, e.g.

8 Sep 2001: Economics. Basic equipment costs around £10,000, but automation can increase this significantly.

8 Sep 2001: cured). Economics. There are few composite forming processes, and the decision of which to use is normally determined first by shape and type of fibre (chopped or continuous), and then by

7 Sep 2001: Young's modulus measures stiffness and is a material constant, i.e. it is the same whatever the size of the test-piece.

8 Sep 2001: As a result, a self-quench is usually sufficient. The equipment is very expensive and not economic for large surfaces, but automation is straightforward and very precise control can be achieved.

11 May 2000: Design a test to rank various materials inorder of their wear resistance. ... Tip: use a very strong materialto sli de against your test materials.

5 Sep 2001: important and could be assessed by a tensile test to measure elastic deformation before failure. ... supported beam of the test material (un-notched, or notched underneath on the tensile edge) – by.

11 May 2000: Devise a test to compare the impact resistanceof different polymers like polystyrene foam,PMM A (also known as Perspex) andpol yethylene.

11 May 2000: Devise a test for comparing the tearresistance of different fabrics. It is onlynecessary to rank the fabrics in order of tearresistance, rather than to get a numericalvalue for each.

11 May 2000: Design a test to see how long polymerscan be held above their maximumservice temperature.

19 May 2000: Coll ect samples of many different typesof rubber bands and test the amount ofelongation before fail ure.

11 May 2000: It isnot economic to use standard processes such as turning –so another approach is needed.