casting

78問 • 1年前

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It is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the discharge shape, and then allowed to solidify

Casting

The solidified part is also known as ____, which is ejected or broken out of the mold to complete the process

Casting

Most often used for making complex shapes that would be otherwise difficult or an economic automatic by the other methods have equipment like machine, tool beds, shapes, propellers, etc. can be cast easily in the required size rather than fabricating by joining several pieces

Casting

A year old process of Casting

7000 year old process

What is the oldest surviving casting from 3200 BC?

Copper frog from 3200 BC

These are usually metals or various time setting materials that cure after mixing two or more components together examples are epoxy, concrete plaster and clay

Casting materials

The powder is then compressed and centered to provide the required shape

Powder Mettalurgy

Many alloys both ferrous, and then nonferrous are cast and then rolled forge or extruded into street shape, broad tube or other sections

Ingot Casting

When produced a singe ingots, ____ generally cast into large iron mounds holding several times of metal

Steel

These moulds generally stand on a flat metal base and are teetered upwards very slightly, so that the moulds can be lifted clear of the solid ingot

ingot casting

Involves molding fund sand around the suitable pattern in such a way that the pattern can be withdrawn to leave a cavity of the correct shape in the sand

Sand casting

A very useful process since very intricate shapes, can reproduce in a large range of metals and alloys

Sand Casting

Typical uses of this art to produce engine blocks machine, tool, base and pump housing

Sand Casting

A permanent metal mold is used in the charge of molten metal is either allowed to run and under the action of gravity or gravity diecasting or is forced in under pressure pressure diecast

Diecasting

Forced in under pressure

pressure Diecasting

Run in under the action of gravity

Gravity diecasting

The die gravity is filled under the gravity, and the charge may be poured by hand, or it may be fed in automatically in modern high-speed plant

Gravity diecasting

A number of different types of machines are employed in pressure they casting, but possibly the most widely used in the cold chamber

Pressure Diecasting

This process has permanent cylindrical, mold without an central core, which is fun at high speed and molten metal, then poured into

Centrifugal, casting

It flings the metal to the surface of the mold, thus producing hollow cylinder of uniform wall thickness

Centrifugal force

This process was widely used in manufacturer of cast iron pipes for water, sewage and gas means though for such purposes, cement or plastic base materials are no commonly used

Centrifugal, casting

The most ancient, casting process and use, and then he mold, was then hardened by firing a process, which also melted out the wax pattern, living a mold cavity without course or parting lines

Investment, casting

This process was rediscovered in the 16th century by Benvenuto Cellini Who used at the producer many works of art in gold and silver

Investment, casting

Who rediscovered investment casting

Benvenuto Cellini

When does investment casting rediscovered?

16th century

Steps on casting

1. injection wax or plastic pattern 2. Ejecting Pattern 3. Pattern Assembly 4. Slurry Coating 5. Stucco coating 6. Completed Mold 7. Pattern Meltout 8. Pouring 9. Shakeout 10. pattern

The use of iron dates back to about 1500 BC when primitive furnaces were used to heat the or in a charcoal fire

steel

Widely used in the latter, half of the 18th century and the early part of 19th century

Iron products

When does steel production started?

Mid 1800s

When does the steel technology advanced rapidly?

Second half of the 19th century

L what cause steel technology advanced rapidly

Due to development of the basic oxygen furnace and continuous casting methods

Computer controlled manufacturing, has increased the efficiency, and reduce the cost of

Steel production

will primary interact with the service centers to determine the availability of products required for a project

Construction engineers

Widely used in civil engineering applications

Steel and steel alloys

Used on a smaller scale for pipes, as well as for general Blacksmith work

wrought iron

Used for pipes, hardware, and machine parts not subjected to potential or dynamic loading

Cast-iron

Classifications of steel

Structural steel, cold formed steel, fastening steel, reinforcining steel

A classification of steel in which it produced by Continuous disgusting and hot rolling for large structural shapes, plates, and sheets steel

Structural steel

Produced by cold, forming of sheets, steel into Desired shapes

Cold form steel

Used for structural connections, including bolts, knots, and washers

Fastening steel

Use reinforcement

Reinforcing steel

What are the materials used to produce pig iron?

Call, limestone, and iron ore

The COAL after transformation to Coke supplies ——-, used to reduce iron oxide in the ore

Carbon

Reduces iron oxide in the ore

COAL

Used to help remove impurities

Limestone

Magnetically extracted from the waste and extracted materials, is formed into pellets and fired

Iron

How many percentage the process ore contains?

65% iron

Properties of steel can be altered by applying a variety of

Heat treatments

What are the common heat treatments employed for steel?

Annealing, normalizing, hardening, and tempering

The basic process is to heat the steel, a specific blank

temperature

Hold the temperature for a specified period of

Time

Call material at a specified

rate

The objectives of this are terrifying the grain soften the steel, remove internal stresses and remove gases, increase, ductility and toughness, and change electrical and ma magnetic properties

Annealing

Types of annealing

full, process, relief, spheroidization

Require seating the steel to about 50°C above the oceanic temperature and holding the temperature until all the steel transformed into either Austin night or Austin night Semite, depending on the carbon

Full annealing

Used to treat work hard in parts made with low carbon steel less than 0.25% carbon

Process annealing

How many degrees Celsius? The material is heated up and held long enough to allow recognization of the ferret face.

700°C

Used to reduce residual stresses in cast, well, dead and cold worked parts and cold formed parts

relief annealing

What is the temperature when heating through relief?

600 to 650°°C

an annealing Process used to improve the ability of high carbon more than 0.6% carbon steel to be machined or cold worked

spheroidization

Improves abrasion resistance

spheroidization

Similar to annealing, with a slight difference in the temperature and the rate of cooling

Normalizing

Steel is normalized by heating to about

60°C or 110°F above austenite line

It produces a uniform, fine grained micro structure

Normalizing

It is an effective process and result in high fracture, toughness, or of the material

Normalizing

Performed to improve Ductility and toughness

Tempering

It causes carbon atoms to diffuse from Martin side to produce a carbide precipitate information of the fair right, and Semite

Heating

In heating process, the steel is called about blank, then reheated by immersion in either oil or nitrate salts

40°C

Steel is hardened by heating it to a temperature above ______

Transformation range

normalizing rate of cooling is faster than they used for blank

Full annealing

Due to the rapid cooling, hardening puts the steel in blank

state of strain

This strain sometimes causes steel pieces with sharp angles, or grooves to crack immediately after hardening

state of strain

Hardening must be followed by

tempering

After quenching steel is cool about 40°C, then reheated by immersion in either _____

nitrate salts or oil

And heating process the steel is maintained at the elevated temperature for about How many hours

Two hours

Normalizing has a temperature of 60°C to 110°F and cooled through

Natural convection

The process ore contains how many percentage of iron?

65%

In full annealing, the heating requires the steel to melt above the temperature line and holding the temperature until all the steel transforms into

austenite

Materials

ユーザ名非公開 · 100問 · 2年前

Materials