ppt 2

Question 1

is a cast part produced by forming a mold from a
sand mixture and then pouring molten liquid metal into the cavity
in the mold. The mold is then cooled until the metal has solidified

Answer 1

Sand casting

Question 2

What is sand casting?

Answer 2

is a cast part produced by forming a mold from a
sand mixture and then pouring molten liquid metal into the cavity
in the mold. The mold is then cooled until the metal has solidified

Question 3

What are the general steps in shand casting?

Answer 3

1. Pattern- making
2. Core- making
3. Molding
4. Metal and pouring
5. Cleaning

Question 4

design to be replicated

Answer 4

pattern- making

Question 5

internal cavity surface

Answer 5

core

Question 6

preparation for the receiving of molten
metal

Answer 6

molding

Question 7

removal of mold, core, scales, or excess
metal

Answer 7

cleaning

Question 8

Mold consists of two halves:

Answer 8

cope and dragg

Question 9

what is the cope?

Answer 9

upper half of mold

Question 10

drag

Answer 10

bottom half of mold

Question 11

The _______ in the sand mold is formed by packing sand around
a pattern, then separating the mold into two halves and
removing the pattern

Answer 11

cavity

Question 12

If casting is to have internal surfaces, a _____ must be included
in mold

Answer 12

core

Question 13

The mold must also contain ________ and ________.

Answer 13

gating and riser system

Question 14

is inverse of final shape with shrinkage allowance

Answer 14

cavity

Question 15

is model of final shape with shrinkage allowance

Answer 15

pattern

Question 16

is made by adding binder in the sand

Answer 16

wet sand

Question 17

Mold cavity is formed by packing sand around a _______

Answer 17

pattern

Question 18

The pattern is usually ________ to allow for shrinkage of metal during solidification and cooling

Answer 18

oversized

Question 19

provides the external features of the cast part

Answer 19

cavity

Question 20

provides internal features of the part. It is placed inside the
mold cavity with some support.

Answer 20

core

Question 21

In sand casting, cores are generally made of ________

Answer 21

sand

Question 22

It is channel through which molten metal flows into cavity from outside
of mold

Answer 22

gating system

Question 23

Consists of a ________, through which metal enters a ______
leading to the main cavity

Answer 23

down-sprue; runner

Question 24

At the top of down-sprue, a ___________ is often used to minimize
splash and turbulence as the metal flows into down-sprue

Answer 24

pouring cup

Question 25

It is a reservoir in the mold which is a source of liquid metal to compensate for shrinkage of the part during solidification.

Answer 25

Riser

Question 26

A full-sized model of the part, slightly enlarged to account for shrinkage and machining allowances in the casting.

Answer 26

pattern

Question 27

what are the possible pattern materials?

Answer 27

1. wood
2. metal
3. plastic

Question 28

[pattern] common material because it is easy to work, but
it warps

Answer 28

wood

Question 29

[pattern] more expensive to make, but lasts much longer

Answer 29

metal

Question 30

[pattern] compromise between wood and metal

Answer 30

plastic

Question 31

types of patterns

Answer 31

1. sold pattern
2. split pattern
3. match- plate pattern
4. cope and drag pattern

Question 32

The problem in locating the parting line. Locating is skill-dependent. Suitable for low production.

Answer 32

solid pattern

Question 33

Relatively easy to locate parting line. Used for low-medium size production

Answer 33

split pattern

Question 34

The cope and drag portions of the pattern are mounted on opposite sides of a wood or metal plate conforming to the parting line.

Answer 34

match plate pattern

Question 35

advantages of match plate pattern

Answer 35

(a) Costly but good production rate
(b) Increase the dimensional accuracy

Question 36

Similar to match plate pattern but split pattern halves are attracted to separate plates

Answer 36

cope and drag patterm

Question 37

the pattern contains built-in gating system thus saves time for making separate gating system in each mold

Answer 37

cope and drag pattern

Question 38

They are also integrally cast in which cast pattern and plate are cast as one piece in sand or plaster molds. It is used with some type of molding machine, in order to obtain maximum speed of molding.

Answer 38

match plate pattern