Unit 10. Selecting Processes: shaping, joining and surface treatment
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1 Unit 10. Selecting Processes: shaping, joining and surface treatment Mike Ashby Department of Engineering University of Cambridge M. F. Ashby, 2013 For reproduction guidance see back page This lecture unit is part of a set created by Mike Ashby to help introduce students to materials, processes and rational selection. The Teaching Resources website aims to support teaching of materials-related courses in Design, Engineering and Science. Resources come in various formats and are aimed primarily at undergraduate education. Some of the resources are open access and students can access them. Others are only available to educators using CES EduPack.
2 Outline, outcomes and resources Processes and their attributes Screening by attributes Selecting shape-forming processes Selecting joining processes Selecting surface-treatment processes Outcomes Ability to find data for process attributes Ability to select process to meet design and material requirements DEMO Hands-on session 1, with exercises Resources Materials: engineering, science, processing and design, 2 nd Edition, Chapter 18 and 19 Materials Selection in Mechanical Design, 4 th edition Chapters 13 and 14
3 Organizing info: manufacturing processes Mould Granular Polymer Nozzle Primary shaping Cylinder Heater Screw Secondary shaping Injection moulding No.8-CMYK-5/01 Machining Joining Surface treating Welding Painting
4 Organizing information: the PROCESS TREE Universe Family Class Member Attributes Difficult! Processes data-table Joining Shaping Surface treatment Each family has attributes that differ. Casting Compression Deformation Rotation Molding Injection Composite RTM Powder Blow Rapid prototyping RTM Blow molding Material Shape Material Injection molding Size Shape Material Range Min. Size Shape section Range Tolerance Min. Size section Range Roughness Tolerance Min. section Economic Roughness Tolerance batch Economic Roughness batch -- specific Economic batch -- general -- specific -- general -- specific -- general Structured information Unstructured information Process records
5 Shape classification Some processes can make only simple shapes, others, complex shapes. Wire drawing, extrusion, rolling, shape rolling: prismatic shapes Stamping, folding, spinning, deep drawing: sheet shapes Casting, molding, powder methods: 3-D shapes
6 Structured data for injection moulding* Injection moulding (Thermoplastics) INJECTION MOULDING of thermoplastics is the equivalent of pressure die casting of metals. Molten polymer is injected under high pressure into a cold steel mould. The polymer solidifies under pressure and the moulding is then ejected. Shape Circular Prism Non-circular Prism Solid 3-D Hollow 3-D Economic attributes Economic batch size Relative tooling cost high Relative equipment cost high Physical attributes Mass range kg Roughness µm Section thickness mm Tolerance mm Process characteristics Discrete Prototyping False Typical uses Injection molding is used. Cost modelling Relative cost index *Using the CES EduPack Level 2 DB + Links to materials Key constraints in choosing a shaping process (economics always important) fx
7 Unstructured data for injection moulding* The process. Most small, complex plastic parts you pick up children s toys, CD cases, telephones are injection moulded. Injection moulding of thermoplastics is the equivalent of pressure die casting of metals. Molten polymer is injected under high pressure into a cold steel mould. The polymer solidifies under pressure and the moulding is then ejected. Various types of injection moulding machines exist, but the most common in use today is the reciprocating screw machine, shown schematically here. Polymer granules are fed into a spiral press like a heated meat-mincer where they mix and soften to a putty-like goo that can be forced through one or more feed-channels ( sprues ) into the die. Mould G ranular Polymer Nozzle Cylinder H eater Screw No.8-CMYK-5/01 Design guidelines. Injection moulding is the best way to mass-produce small, precise, plastic parts with complex shapes. The surface finish is good; texture and pattern can be moulded in, and fine detail reproduces well. The only finishing operation is the removal of the sprue. The economics. Capital cost are medium to high; tooling costs are high, making injection moulding economic only for large batch-sizes (typically 5000 to 1 million). Production rate can be high particularly for small mouldings. Multi-cavity moulds are often used. The process is used almost exclusively for large volume production. Prototype mouldings can be made using cheaper single cavity moulds of cheaper materials. Quality can be high but may be traded off against production rate. Process may also be used with thermosets and rubbers. Typical uses. The applications, of great variety, include: housings, containers, covers, knobs, tool handles, plumbing fittings, lenses, etc. The environment. Thermoplastic sprues can be recycled. Extraction may be required for volatile fumes. Significant dust exposures may occur in the formulation of the resins. Thermostatic controller malfunctions can be extremely hazardous. *Using the CES EduPack Level 2 DB
8 Finding information with CES EduPack Table: Subset: Process Universe Edu Level ProcessUniverse Joining Shaping Surface treatment
9 Data organization: joining processes Kingdom Family Class Member Attributes Processes Joining Shaping Surface treatment Adhesives Welding Fasteners Braze Solder Gas Arc e -beam... Gas welding Gas welding Gas welding Material Material Joint Material geometry Joint geometry Size Joint Range geometry Size Range Section Size thickness Range Section thickness Relative Section cost thickness... Relative cost... Relative cost... Lap Joint geometry Butt Sleeve Scarf Tee
10 A joining record* Gas Tungsten Arc (TIG) Tungsten inert-gas (TIG) welding, the third of the Big Three (the others are MMA and MIG) is the cleanest and most precise, but also the most expensive. In one regard it is very like MIG welding: an arc is struck between a non-consumable tungsten electrode and the work piece, shielded by inert gas (argon, helium, carbon dioxide) to protect the molten metal from contamination. But, in this case, the tungsten electrode is not consumed because of its extremely high melting temperature. Filler material is supplied separately as wire or rod. TIG welding works well with thin sheet and can be used manually, but is easily automated. Joint geometry Lap Butt Sleeve Scarf Tee Physical attributes Component size non-restricted Watertight/airtight Demountable False Section thickness mm Typical uses TIG welding is used. Materials Ferrous metals Key constraints in choosing a joining process Economic attributes Relative tooling cost low Relative equipment cost medium Labor intensity low + Links to materials *Using the CES EduPack Level 1 DB
11 Data organization: joining and surface treatment Kingdom Family Class Member Attributes Processes Joining Shaping Surface treatment Heat treat Paint/print Coat Polish Texture... Electroplate Anodize Powder coat Metallize... Anodize Anodize Anodize Material Material Why Material treatment? Why treatment? Coating Function thickness of Coating treatment thickness Surface hardness Surface Coating hardness thickness Relative cost... Relative Surface cost hardness... Relative cost... Process records Function of treatment Increased hardness Wear resistance Fatigue resistance Corrosion resistance Oxidation resistance Thermal insulation Electrical insulation Color Texture Decoration.
12 A surface-treatment record* Induction and flame hardening Take a medium or high carbon steel -- cheap, easily formed and machined -- and flash its surface temperature up into the austenitic phase-region, from which it is rapidly cooled from a gas or liquid jet, giving a martensitic surface layer. The result is a tough body with a hard, wear and fatigue resistant, surface skin. Both processes allow the surface of carbon steels to be hardened with minimum distortion or oxidation. In induction hardening, a high frequency (up to 50kHz) electromagnetic field induces eddy-currents in the surface of the work-piece, locally heating it; the depth of hardening depends on the frequency. In flame hardening, heat is applied instead by hightemperature gas burners, followed, as before, by rapid cooling. Function of treatment Fatigue resistance Friction control Wear resistance Hardness Physical attributes Curved surface coverage Very good Coating thickness 300-3e+003 µm Processing temperature K Surface hardness Vickers Economic attributes Relative tooling cost Relative equipment cost Labor intensity low medium low + Links to materials Typical uses Induction hardening is used.. Key constraints in choosing a surface treatment *Using the CES EduPack Level 2 DB
13 So what? Processes can be organised into a tree structure containing records for structured data and supporting information The structure allows easy searching for process data Links connect processes to materials Select on primary constraints Shaping: material, shape and batch size Joining: material(s) and joint geometry Surface treatment: material and function of treatment in CES EduPack, and
14 Lecture Unit Series These PowerPoint lecture units, as well as many other types of resources, are on the Teaching Resource Website. Finding and Displaying Information Sustainability Unit 1 Unit 2 Unit 3 Unit 4 The Materials and Process Universe: families, classes, members, attributes Materials Charts: mapping the materials universe The Elements: property origins, trends and relationships Material Properties Manipulating Properties: chemistry, microstructure, architecture Unit 12 Unit 13 Unit 14 Unit 15 Eco Selection: the eco audit tool Advanced Eco Design: systematic material selection Low Carbon Power: resource intensities and materials use Special Topics Architecture and the Built Environment: materials for construction Unit 5 Designing new materials: filling the boundaries of materials property space Selection Unit 16 Unit 17 Structural Sections: shape in motion CES EduPack Bio Edition: Natural and man-made implantable materials Unit 6 Unit 7 Unit 8 Unit 9 Translation, Screening, : the first step in optimized selection Ranking: refining the choice Objectives in Conflict: trade-off methods and penalty functions Material and shape Unit 18 Unit 19 Unit 20 Materials in Industrial Design: Why do consumers buy products? Advanced Databases: Level 3 Standard, Aerospace and Polymer Advanced Teaching and Research Hybrid Synthesizer: modelling composites, cellular structures and sandwich panels Unit 10 Selecting Processes: shaping, joining and surface treatment Unit 21 Database Creation: using CES constructor in research Unit 11 The Economics: cost modelling for selection Unit 22 Research: CES Selector and Constructor Unit 23 Sustainability: sustainability and materials selection Unit 24 The Polymer Edition Unit 25 The Aerospace Edition
15 Author Mike Ashby University of Cambridge, Granta Design Ltd. Reproduction These resources are copyright in the usual way. You can reproduce them to use them for teaching provided you have purchased access to Granta s Teaching Resources. Please make sure that Granta Design is credited on any reproductions. You cannot use these resources for any commercial purposes. There are 200+ resources available Including: 77 PowerPoint lecture units Exercises with worked solutions Recorded webinars Posters White Papers Solution Manuals Interactive Case Studies Accuracy We try hard to make sure these resources are of a high quality. If you have any suggestions for improvements, please contact us by at teachingresources@grantadesign.com M. F. Ashby, 2013 Granta s Teaching Resources website aims to support teaching of materials-related courses in Engineering, Science and Design. The resources come in various formats and are aimed at different levels of student. This resource is part of a set created by Mike Ashby to help introduce materials and materials selection to students. The website also contains other resources contributed by faculty at the 800+ universities and colleges worldwide using Granta s CES EduPack. The teaching resource website contains both resources that require the use of CES EduPack and those that don t.
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