Summary
Summary - MECH230
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Health & Safety Engineering Materials Injection molding Metal Casting Machining Design for machining
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CH 1 - IntroductionAdding Value: Manufacturing adds value to the raw material.
Design: set of activities from product definition and market research all the way to commercialization of
the product.
Manufacturing: making the product including the planning of the manufacturing processes.
Sequential Design Approach:
- Straight forward
- May waste time and resources
- Preferred approach in traditional industries.
Concurrent design approach:
- Popular in consumer electronics sector
- Get the product to market as quick as possible
- Involve multiple disciplines early in the design process
- Popular in small to medium enterprise
Quality Assurance:
- Quality must be built into the entire process.
- Continuous control of process in critical.
- Quality is the responsibility of everyone involved.
ISO 9000: this Is a process certification and not a product certification.
,Design philosophies:
- Design for manufacturing
- Design for assembly
- Design for Disassembly
- Design for inspection
- Design for service
Cost of manufacturing:
- Fixed cost: utility bills, rental of facilities, insurance, etc.
- Capital: machinery, buildings, etc.
- Tooling: molds, Cutting tools, etc.
- Raw: Material.
- Labor: direct(productive labor) and indirect (overhead)
Manufacturing: it is not only the process of making parts, but also extracting the material, taking the
parts and delivering them to consumer.
To compare manufacturing process, we use:
- Cost
- Rate
- Quality
- Flexibility
And we discuss for each process:
- The physics
- The capabilities
- The equipment
- Rules for design for manufacturing (DFM)
,CH2 – Health & Safety
Basic guidelines:
- Loose clothing can be caught in moving machinery.
- Wear goggles at all times.
- No ties, watches, jewelry
- No sandals or soft shoes.
Most accidents in the works place are cause by slips, trips and falls.
Hazar: any source having the potential to damage, harm or adversely affect something or someone
during work.
Ex:
Risk: is a combination of the likelihood and severity of a hazardous event.
*Likelihood is measure of an event occurring within specific time.
*Severity is the outcome of an event (e.g. Injury, death, damage).
, Risk Assessment is by:
- Identity risks
- Evaluate risks
- Manage Risks
- Review
Hydrotest: is a way which pressure vessels such as pipelines, plumbing, gas cylinders can be tested for
strength and leaks.
CH4 – Engineering Materials
Selection of Material depends on:
1) Properties:
a) Mechanical – strength, ductility, hardness, etc.
b) Physical -density, thermal expansion, etc.
c) Chemical- oxidation, corrosion, etc.
2) Availability – how available is the material.
3) Reliability of supply -where is the material coming from.
Ferrous metals:
- Relatively low cost.
- Usually used for:
a) Reinforcements bars and structural members for construction
b) Plates for boilers, reactors and ships.
c) Rails for railway trucks.
d) Gears, shafts, dies and molds.
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