To understand the effects of globalization and the challenges it presents is assisted through the use of modern communication technologies and also the ability to expand into newly opening l…Full description
Descripción: benfit of additive manufacturing
Full description
brtFull description
Full description
Biosimilar is the term coined for protein drugs that are similar, but not identical to, an existing product. Copies of biopharmaceuticals (proteins) that can be made after the patent on the …Full description
pileFull description
Full description
Full description
ghgjFull description
Investment analysis
Full description
research findings for normincord
Advantages-disadvantages of Party SystemsFull description
efervercentFull description
the ventages and disadventages of eating
very useful for engineering students
CASTING PROCESSES Advantages & Disadvantages
Taha Mustahsan Roll #: 14 Reg #: 2008-UET-IEFR-MECH-FD-08 Submitted to: Sir Syed Amjad Ahmed
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
1 1.
High speed production can be achieved as the whole process is completely automated.
2.
Possible to obtain fairly complex castings than that feasible by gravity die casting due to the use of the movable cores.
3.
Very small thicknesses can be easily filled as the liquid metal is injected under high
4.
set up a pressure die casting process. 2. The die casting machines & tooling costs are very expensive. 3. Cannot be used for large castings as the casting machine capacity is limited. 4. It is not suitable for all materials
pressure.
because of the limitations of the die
Very good surface finish can be obtained &
materials & the alloys used must have a
most of pressure die castings can be
low melting point.
directly electroplated without any further processing. 5.
1. Large capital investment is required to
5. High porosity is common & heat treatment treatment is difficult.
Closer dimensional tolerances & better mechanical properties can be obtained compared to sand casting.
6.
Very economical for large scale production.
Automotive parts parts like wheels, wheels, blocks, blocks, cylinder heads, manifolds manifolds etc. etc.
Aerospace castings. castings.
Electric motor housings.
Kitchen ware such as pressure cooker.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
2 1. Complex shapes which are difficult by any other method are possible. 2. Very close tolerances and excellent surface finish can be obtained. 3. Ready for use with little or no machining required. 4. Almost any any metal can can be cast. cast.
1. Time consuming as shell molds cannot be reused. 2. Expensive as many labor involved in the preparation of the wax patterns & shell molds. 3. The size of the casting is often limited. 4. Occasional minute defects.
5. No flash or parting lines. 6. Suit for producing complex shapes where other manufacturing processes are too costly and time-consuming.
Typically materials that can be cast with this process are Aluminum alloys, Bronzes, Stainless steels, Satellite etc. Glass mold accessory castings, Valves and fittings, Gears, Levers and Splines are some of the popular usages.
Time consuming process and costly. Exceptional surface finish possible but minute lacuna can cause rejection of castings as a result scrap rates can be high.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
3 1. Low capital investment means that short production runs are viable. 2. Use of sand cores allows fairly complex shapes to be cast.
1. The process has a high unit cost, as it is labor intensive and time consuming. 2. The sand mold leaves bad surface finish.
3. Large components can be produced.
3. Further machining process is required.
4. Suitable for small batch production
4. We cannot make thin sections.
(small production rates).
5. Not suitable for mass production.
5. It is a quick process.
6. Scrap metal increased.
6. All kind of metals can be used in sand
7. Poor material strength.
casting process. 7. There is no size limit.
Sand casting process is used to make
Engine blocks,
Gear blanks
Crankshafts
Brake drums
Fan blades
Tubes etc.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
4 1. Smooth "As Cast" finish (25 RMS)
1. More costly than Sand or Permanent
2. Closer dimensional tolerance than Sand Casting 3. Intricate shapes and fine details
Mold-Casting 2. Limited number of sources 3. Requires minimum of 1 deg. draft
including thinner "As Cast" walls are possible 4. Large parts cost less to cast than by Investment process
It can be used for making quick prototype parts as well as limited production parts.
Poor productivity as it has lengthy processing problems.
Close monitoring of the production process.
The problems of poor mold permeability.
Impaired mechanical mechanical properties a possibility as a result of slow cooling of the casting.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
5 1. Relatively very light impurities move inwards towards center. So they can be removed easily thus helping in producing sound castings. 2. These castings have a directional solidification starting from outside to inside. 3. Central core is not required for making a hole or pipe 4. Employment of gates and risers is not required 5. This technique is best suited for the mass production of symmetrical objects. 6. Castings yield is very high in some cases it is even equal to 100%
Bearings for machines
Pipes
Liners for IC engines
Rings and other annular components
Wheels nozzles and similar parts.
1. Centrifugal castings require very high investments. 2. Skilled labors are to be employed for this process. 3. Only some shapes can be generated by this casting process.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
6 1. Good dimensional tolerances are possible 2. Excellent part-part dimensional consistency 3. Parts require a minimal post machining 4. The process is more economical and efficient. 5. It offers a large range of shapes and components than any other
1. Economical Economical only in very large quantities due to high tool cost 2. Not recommended for hydrostatic pressure applications 3. For Castings where penetrant (die) or radiographic inspection are not required. 4. Difficult to guarantee guarantee minimum mechanical properties
manufacturing process.
1. It is dimensionally accurate, maintains
1. The pattern costs can be high for low
an excellent surface finish and has no
volume applications and the patterns
parting lines so no flash is formed.
are easily damaged or distorted due to
2. As compared compared to investment investment casting, casting, it is cheaper because it is a simpler process and the foam is cheaper than the wax.
their low strength. 2. If a die is used to create the patterns there is a large initial cost.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
7 1.
Less expensive than Investment or Die
1.
Castings. 2.
3.
Dimensional Tolerances closer than Sand
Only non-ferrous metals may be cast by this process.
2.
Less competitive with Sand Cast process
Castings.
when three or more sand cores are
Castings are dense and pressure tight.
required. 3.
Higher tooling cost than Sand Cast.
Products include gears, splines, wheels, gear housings, pipe fittings, fuel injection housings, and automotive engine pistons.