be 102- design and engineering module 4 · design for environmental processing and manufacturing...
TRANSCRIPT
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BE 102- Design and Engineering
Module 4
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Module 4 - 15 % Marks4 Hours Lecture
Design for “X”; covering quality, reliability, safety, manufacturing/construction, assembly, maintenance, logistics, handling; disassembly; recycling; re-engineering etc. List out the design requirements(x) for designing a rocket etc.
4 Hours ProjectDesign mineral water bottles that could be packed compactly for transportation.
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DESIGN FOR “X”
Initial design based onfunction, appearance & cost
Other major objectives than those dealt in initial designDesign for “X” , Where, X= Design objective( other than those dealt during initial stages of design )
Some of the objectives are :Design for Manufacturing/ConstructionDesign for Assembly/FittingDesign for Safety and ReliabilityDesign for Maintenance & ServiceabilityDesign for LogisticsDesign for Disassembly and Recycling
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DESIGN FOR MANUFACTURING/CONSTRUCTION
DFM is based on : Minimizing Cost of productionMinimizing Time to market while maintaining appropriatelevel of quality.
First design team is formed: include engineers, managers,logistics specialists, accountants, marketing & sales professionals.
Reduction in parts and their costs Use of standard parts/subcontracted items. Change in materials if possible. Use wider tolerances wherever possible. Design using Group Technology.
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Who Casts the biggest shadow ?
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Design for XX=MANUFACTURING
X=ASSEMBLY
X=RELIABILITY
X=MAINTAINABILITY
X=SERVICEABILITY
X=ENVIRONMENT
X=LIFE CYCLE COST
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DFMDesign for manufacturability (DFM)is the generalengineering art of designing products in such away that they are easy to manufacture.
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Design for Manufacturing (DFM)
� Designing or engineering a product in order to facilitate the manufacturingprocess
� Reduce manufacturing cost
� Designer should consider the type of rawmaterial and the formof the rawmaterial
� Optimize all the manufacturing functions: fabrication, assembly, test,shipping, delivery, service, and repair
� Assure the best cost, quality, reliability, regulatory compliance, safety, time-to-market, and customer satisfaction.
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1. Simplify the design and reduce the number of parts
DFM GUIDELINES
The reduction of the number of parts in a product is probably the best opportunity for reducingmanufacturing costs. Less parts implies less purchases, inventory, handling, processing time,development time, equipment, engineering time, assembly difficulty, service inspection, testing,etc.
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2. Develop a modular design
The use of modules in product design simplifies manufacturing activities such as inspection, testing, assembly, purchasing, redesign, maintenance, service, and so on.
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3.Use of standard components
Standard components are less expensive than custom-made items. The high availability of thesecomponentsreduces product lead times. Also, their reliability factors are well ascertained. Furthermore, the use ofstandardcomponents refers to the production pressure to the supplier, relieving in part the manufacture’s concern ofmeetingproduction schedules.
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3.Design parts to be multi-functional
Multi-functional parts reduce the total number of parts in a design, thus, obtaining the benefitsgiven in rule
Automobile chassis act as structural
member as well as electricity earthing lineBike engine casing act as heat
dissipater
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4. Design for ease of fabrication
Select the optimum combination between the material and fabrication process to minimizethe overall manufacturing cost. In general, final operations such as painting, polishing, finishmachining, etc. should be avoided. Excessive tolerance, surface-finish requirement, and soon are commonly found problems that result in higher than necessary production cost.
5. Provide Tolerance Each manufacturing process has an inherent ability to maintain a certain range oftolerances, and to produce a certain surface roughness (finish).To achieve tolerancesoutside of the normal range requires special processing that typically results in anexponential increase in the manufacturing cost
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Design for Assembly (DFA)
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It is a subset of DFM which involves the minimization of cost of assembly
• To maximize ease of assembly
– Part is inserted from top
– Part is self aligned
– Part does not need to be oriented
– Part requires only one hand for assembly
– Part require no tool
– Part is assembled in single linear motion
– Part is secured immediately upon insertion
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Design for uni-directionalassembly preferablyusing gravity. Assembly toa stable base
Design parts by considering access and visibility for ease of insertion
Self Aligned Parts Avoid separate fasteners: design the fastening functions into the parts.
Uni-directional insertion
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Use hustle free joining methods
Snap Joints
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MISTAKE PROOFING ISSUES(POKA-YOKE)
• Cannot assemble wrong part• Cannot omit part• Cannot assemble part wrong way around.
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Design for Reliability
Reliability is defined as the probability that a component, equipment or system will satisfactorily perform its intended function under given circumstances.
Improving Reliability• Making failures less likely to happen in the first place
(e.g. By maintaining the equipment properly or fitting morereliable equipment)• Making changes such that the overall system continues to function satisfactorily even
when a failure occurs(e.g. By fitting standby equipment)
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Reliability Network
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DESIGN FOR SAFETY & RELIABILITY
Product safety is to be ensured in design. This covers the materials used, design aspects on safety
in operation, fool proofing, warning systems etc. They prepare test plans and go accordingly...\Innovative designs\Video 17 Crash Test NewMercedesSLS AMG 2010.mp4..\Innovative designs\Video 18 Turbine engine explodes.mp4
Providing ordnance in space vehicles as ultimate safety tool.
In order to improve the reliability redundant systems areused in specific designs.
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Design for Maintainability & Serviceability
The objective of Design for Maintainability is to assure that the design will performsatisfactorily throughout its intended life with a minimumexpenditure of budget and effort.Design for maintainability (DFM), Design for Serviceability (DFS), and Design forReliability (DFR) are related because minimizing maintenance and facilitating service canbe achieved by improving reliability.
An effective DFM minimizes 1. The downtime for maintenance,2. user and technician maintenance time,3. personnel injury resulting from maintenance tasks,4. cost resulting from maintainability features, and5. logistics requirements for replacement parts, backup units, and personnel
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Types of Maintenance
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Improving Maintainability
� Minimize the number of serviceable design parameters (DPs)with simple procedures andskills.
� Provide easy access to the serviceable DPs by placing them inserviceable locations. Thiswill also enhance the visual inspection process for failureidentification.
� Use common fasteners and attachment methods.
� Design for minimum hand tools.
� Provide for safety devices (guards, covers, switches, etc.)
� Design for minimum adjustment and make adjustable DPs accessible.
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Placing projector bulb at
accessible location reduce maintenance
Use standard fasteners
Providing protective
casing is DSM
Easy access to Watch battery is a
Maintainability consideration
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Design for Environment
� Design for environmental processing and manufacturing
� Design for environmental packaging
� Design for disposal or reuse
� Design for energy efficiency
Design for the Environment (DFE) is a design approach to reduce the overall humanhealth andenvironmental impact of a product, process or service, where impacts are considered across its life cycle.
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DESIGN FOR LOGISTICS
Design for packaging, handling, transportation and storage.
Design for seamless transportation. Optimal packaging to save space and damage. Provision for product handling with safety.
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Design for Life cycle cost
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Design for Disassembly & Recycling
Design for disassembly is the strategy that considering thefuture need of a product that to be disassembled for repair,refurbish or recycle
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How Many Lifetimes?
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Mixed Materials
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Separating Materials
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Disassembly Allows…
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Race Against Time
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Disassembly Strategies
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Redesign for Disassembly
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Biodegrading
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Recycling/Reuse
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Recyclability Strategies
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Downcycling/Recycling/Upcycling
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Redesign for Recycling
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Take back Programs
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Recycling & Reuse Save Materials