unit3notes - Unit 3 Selecting processes shaping joining and...

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Unit 3 Selecting processes: shaping, joining and surface treatment
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2 CES EduPack Notes for Instructors Frame 3.1 Outline Description If materials are to be used, they must be shaped, joined and finished. You can’t choose a material without considering how it will be processed. Here we examine the classification, characterisation and selection of processes. Further Information Process selection: The Text, Chapters 11 and 12, p. 247 - 302
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Unit 3: Selecting processes 3 Frame 3.2 Manufacturing processes Description These schematics introduce the three families of manufacturing processes: those that create shape, those that join shapes together, and those that coat, treat or finish the surface.
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4 CES EduPack Notes for Instructors Frame 3.3 Data organisation: processes Description This classification of processes allows information about them to be organised in a useful way, one that parallels that for materials in Unit 1. The three families – shaping, joining and surfacing – each contain a number of classes; that for shaping is expanded here. Each class has many members, as the expansion of moulding in this frame suggests. And each member is characterised by a set of attributes, some numeric and able to be structured, some based on text and images that are stored as unstructured information.
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Unit 3: Selecting processes 5 Frame 3.4 Shape classification Description Shape is the most difficult attribute to describe and quantify. Many texts on processing attempt a classification; none is wholly satisfactory. We have explored many alternatives and have finally returned to the simple breakdown shown in this frame. Here the primary distinctions are between prismatic shapes made by processes such as wire extrusion, rolling and wire-drawing; shapes made from sheet by stamping, deep drawing, spinning or folding; and 3-dimensional shapes that involve change of section made by casting, moulding and a host of more elaborate procedures. Further Information Shape: The Text, Chapter 11, p. 266-271
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6 CES EduPack Notes for Instructors Frame 3.5 Structured data for injection moulding Description This is an example of structure data for a shaping process. The physical attributes include the size of part that can be made (mass range), the surface roughness, the minimum thickness of section (often limited by the ability of material to flow into narrow channels) and the precision or tolerance of which it is capable. Structured information includes an identification of the process as discrete (like stamping) or continuous (like wire-drawing), of the shapes it can make, and information about economics.
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Unit 3: Selecting processes 7 Frame 3.6 Unstructured data for injection moulding Description Much information about processes is specialised and best recorded as text and images. It includes design guidelines, technical information, examples of uses, and a commentary guiding its economic use and identifying any environmental concerns that it raises.
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This note was uploaded on 02/01/2012 for the course MSEG 302 taught by Professor Snively during the Spring '08 term at University of Delaware.

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unit3notes - Unit 3 Selecting processes shaping joining and...

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