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Man pro - Exam 1
A comprehensive description of machines and processes involved in the manufacture of modern engineered products.
18
Mechanical Engineering
Not Applicable
06/12/2017

Additional Mechanical Engineering Flashcards

 


 

Cards

Term
  • Raw materials are processed and turned into products by manufacturing and assembling
  • Products are assembled from individually manufactued components
Definition
Term
Batch runs
Definition
Required to maintain stock or satify an order
Term

Design for:

 

Manufactue

Assembly

Maintainability

Definition

Design should be manufacturable:

  1. with least possible operations
  2. with simple operations
  3. from standard stock material
Term
Material Selection
Definition
  • Material compatibility with tooling and processing costs
  • material preoperty compatibility with processing
  • material preoperty compatibility with fabrication
Term

Biocide: antibacterial - silver, copper

eg. Gold is conductive but not a biocide

 

Bioinert: doesn't react with biological tissue (can be used in the body) - titanium

 

 

Definition
Term
Production Methods
Definition
  1. Casting
  2. Forging
  3. Rolling
  4. Extrusion
  5. PM - powder metallurgy
  6. Machining
  7. Fabrication
  8. 3D-Printing
Term
Metal Casting
Definition

melt metal in furnace

Pour into mold cavity

allow to cool & solidify

finishing

 

Term
Metal casting: Advantages
Definition

Complex shapes: cavities, passageways, non-symetric shapes, curved surfaces

 

can be used for large parts

 

Term
Metal casting: Disadvantages
Definition
  • Poor material properties
  • defects: voids, porosity, ect.
  • poor dimensional control
  • poor surface finish
  • slow 
  • wastes material
Term

Tin (Sn)

 

(232 °C)

Definition
  • low mp (232 °C)
  • anticorrisive
  • non-toxic
  • low strength

 

Generally alloyed with other metals for casting

 

Term

Lead (Pb)

 

(327 °C)

Definition
  • low mp (327 °C)
  • anticorrosive
  • toxic
  • low strength (alloyed with antimony (Sb))
  • very dense

 

Fishing weights, shots, ect.

Term

Zinc (Zn)

 

(419 °C)

Definition
  • moderate mp (419 °C)
  • corrosive (sacrificail annode)
  • flows well when molten

 

Cheap castings

Term

Magnesium (Mg)

 

(649 °C)

 

Definition
  • higher mp (649 °C)
  • good stregth/weight ratio
  • poor corrosion in marine environment
  • flammable
  • expensive

 

special engine parts

Term

Aluminium (Al)

 

(660 °C)

 

Definition
  • higher mp (660 °C)

  • good sub. for Magnesium
  • non-toxic
  • moderate strength
  • good conductivity
 
motor housing, aircraft castings
Term

Copper (cu)

 

(1083 °C)


Definition
  • anticorrosive
  • biocide
  • bronze alloys - good bearings
  • brass alloys - easily machined and soldered

 

plumbing, marine propellers

Term

NIckel (Ni) & Cobalt (Co)

 

(1435 °C, 1495 °C)



Definition
  • magnetic
  • good for high temp parts

 

gas turbine blades

 

Term

Titanium (Ti)

 

(1670 °C)


Definition
  • good strength/weight ratio
  • anticorrosive
  • bioinert eg. tooth, hip implants
  • highly reactive when molten

 

military & spacecraft parts

Term

Refractory metals

 

Molybdenum (Mo), Niobium (Nn), Tungsten (W)

 

(2610 °C)(2740 °C)(3410 °C)

Definition
  • oxidize rapidly when molten 
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