1. Impression area generally derived
from .
Cavity plates
2. To enhance
physical properties of plastic material are added
into it.
fillers
3.
are used for clamping
the top assembly to the machine platen.
mounting plates
4.
is the solid part of the mould, which gives outer
shape to the moulding.
Cavity
5.
is used to create hollow shape of the mould, where the plastic
is formed to shape.
Core
6.
to be used in mould to facilitate the seating of ejector assembly.
Heel Blocks.
7.
houses or retains the ejector pins and retainer
pins.
ejector plate
8.
are used to holding
and feeding the material inside barrel.
Hopper
9.
In , the material will be heated
and is brought to the injection stage.
Barrel
10.
10. The is connected
to the end of the barrel , through Which the Softened
material passes into the
mould.
Nozzle
11.
Feeding system generally
consist of .
Sprue, runner and gate
12.
To enhance velocity
of material , are used.
Gates
13.
are used for guiding
the top and bottom half of mould
assembly.
Pillars and bushes
14.
Clamping
force used for the mould assembly while injection process.
Locking
15.
can create
visible marks on the core side of component.
Ejector
16.
is provided
in the mould to facilitate solidification of moulding
parts.
cooling
17.
is used to mount
locating ring.
Mounting plate
18.
Maximum mould size can be effected by
Tie Bar
19.
Plastic material temperature can be controled by
Barrel
20.
is not required
for single cavity
moulds.
runner
21.
The fixed half of the mould is attached to of the machine.
Fixed platten
22.
The core is situated half of the mould.
Moving half
23.
The external form of the moulding is formed by .
Cavity
24.
The internal form of the moulding is formed by .
Core
25.
The plastic matterial
is delivered through
nozzle of the machine to the impression area is known as .
Sprue bush
26.
The allignment between
nozzle of the machine and the sprue
bush is ensured by
.
Locating ring
27.
The channel connecting sprue with entrance
of the impression is called .
Runner
28.
The ejector system
is brought back to its original position
by using .
push back pins
29.
Gate is the channel which connects the with the impression.
Runner
30.
are used to pull the sprue
out of sprue bush when the mould opens.
Sprue breakers
31.
The most preferable runner cros section
is .
Round
32.
The orifice connecting runner withe the impression cross section is .
Gate
33.
Side gating in the cylindrical mouldings will lead to the formation of .
Weld marks
34.
The gate that feeds into the impression below the parting
surface at the mould is
gate .
submarine
35.
is used for large thin walled
component to assist
in the production of warpage
free products.
Film
36.
is used for large
tubelar mouldings.
Ring
37.
distance, that the machine
platens can be separated from each other .
Maximum daylight
38.
How is the die used in injection
molding cooled?
Water
39.
How does the piston in the clamping
unit move?
Hydraulic energy
40.
Where does the granular molding
material get loaded
into .
Hopper
41.
Which of the following material
is not made by injection molding?
Tubes
42.
Which of the following factors
is not considered in a ram type injection molding?
Volume of material
43.
What is the minimum pressure
allowed to be given to the injection molding process?
90 Mpa
44.
Which of the following types of molecular
structure present in thermosetting polymers?
Cross-linked poly
45.
Thermosetting plastics are generally used for making products of high .
All of these.
46.
plastics can be used for manufacturing of windshield for airplane .
Thermosetting
47.
is crystalline and not available in transparent form .
LDPE
48.
ENSIDUR is the trade name of .
ABS
49.
Maximum volume material
injected by the screw during one cycle of operation is known as .
Shot capacity
50.
Leakage of plastic
material through the nozzle in between shots is known as .
Drooling
51
is the maximum pressure
by which the material is injected through
the nozzle .
Injection pressure
52
Range of melting
temperature of ABS matterial .
220-250
53
is the maximum force that the clamping system
can exert on the mold.
Claming force
54
Range of melting
temperature of PVC matterial .
180-210
55
Range of melting
temperature of NYLON matterial .
240-250
56
Density of Polycarbonate matterial is .
1.2
57
Density of NYLON-11matterial is .
1.05
58
Density of NYLON-6
matterial is .
1.13
59
Density of Polypropylene matterial is .
0.9
60
Density of PVC(Rigid) matterial is .
1.44
61
Reverse taper nozzles
are used in matterial.
ABS
62
transfers the plaastic material
from hopper to heated portion
of the barrel.
Feed section
63
The final mixing
and heating of material into a homogenious melt is carried
out in
.
Metering Zone
64
For polymers like , nozzle made of stainless steel are used .
PVC
65
is the process of cleaning one colour or type of material from cylinder of the
machine.
purging
66
Where the ejection
force is less is used to return
the ejector assembly
to its position.
Spring
67
is
the simplest and most economical type of ejecton used in the moulds.
Pin ejection
68
is used for cylindrical moulding or small
bosses inside the mouldings.
sleeve ejection
69
is used for small
ribs and slenders
parts .
Blade ejection
70
is used for extracting the bush matterial
,when the next cycle for moulding is processed.
sprue puller pin
71
The moulding will when it cools .
solidify
72
The fit which is suitable
for Ejector pin and is mating hole is .
H7/g6
73
A sink mark will be formed on the component when the pin the core.
uniform inside
74
The portion of both the mould plates
which but together
is called the surface.
parting
75
The matterial which passes through
the gap in the parting
surface is called .
flash
76
Sink maks,discolouration,incomplete filling
can be avoided by the presence of .
air vent
77
If the depth of vent is greater
than mm the plastic matterial
can pass through
it.
0.05
[21:38, 1/02/2019] Er Nilesh: 78 Percentage of shrinkage for ABS matterial is .
0.2 -0.4
79
Percentage
of shrinkage for Polycarbonate matterial is .
0.6 - 0.8
80
Percentage
of shrinkage for Nylon matterial is .
0.4 - 1.0
81
Percentage
of shrinkage for Polystyrene(PS) matterial
is .
0.5 - 0.6
82
Percentage
of shrinkage for Acrylic matterial is .
0.4 - 0.8
83
Injected plastic will flow freely in a mould .
pre heated
84
Weldlines,blemishes and flow marks can be minimised by keeping the mould temperature slightly than the normal temperature.
High
85
Bubbler system is used for cooling inserts.
Small
86
Closing the ends of holes
to form a continuous cercuit
is done by means of .
plugs
87
The efficient way of cooling
core insert is channel design
.
Spiral
88
Moulding temperature for ABS material
is ˚ C .
50
89
Moulding
temperature for Polycarbonate material is ˚ C.
70
90
Moulding
temperature for Polypropylene material is ˚ C.
60
91
Solidification time is required
for the surface
area of mouldings.
cooling
92
The solidification time is proportional to square of the of mouldings.
Wall thickness
93
Heat released during solidification time is dependant
on of the matterial.
Density
94
Cooling Channels are not required
in moulds .
Hand injection
95
The part of a injection
mould which forms
the external shape of the moulding is
.
cavity
96
The part of a injection
mould which forms
the external shape of the moulding is
.
cavity
97
A moulding with a recess
or projection outside
surface of the component is termed as
.
None of these.
98
For symetrical components the joint line is positioned in the line.
Edge
99
Mechanical
or hydraulic mechanisms are used to actuate splits .
None of these.
100
Cam tracks are attached to mould half.
Moving
101
are used for forming
a hole or recess in the side face of a moulding
.
side core
102
The final closing
movement and locking
of the carraige assembly are by means of
.
Locking heel
103
is the part which connects the ejector plate of the mould to the moulding
machine.
connecting rod
104
When short delay period is required in the opening
of splits cam method
are employed.
Finger cams
105
When longer delay
period is required
in the opening of splits cam method
are employed.
Dog leg cam
[21:38, 1/02/2019] Er Nilesh: 106 When the moulding profile
has curved section
just like pipe fittings, are used .
Curved side core
107
In type of moulds degating
is done manually .
Two plate moulds
108
is used for a undercut in the internal
walls of the moulding.
Form pins
109
The can be moved forword
for ejection either
in straight plane or an angled plane.
split core
110
The design is commonly used when the moulding matterial
is elastic and profile can expandable.
stripper plate
111
In the specified
figure,The amount of withdrawal obtained
may be computed from the following relation,M=EtanØ,where E is movement.
Ejection
112
The design is commonly used when the moulding is having a open side.
stripper plate
113
The can be used when the undercut
of the moulding is small.
Form pins
114
If the internal
thread are to be stripped
from the core ,the form of the thread should
be
thread.
Rolled
115
Loose threaded core is used in the moulding of threads.
Internal Boss
116
split movement for threaded splits
are provided by .
Dog leg cam
117
Striping of components with external threads
of form from the cavity
is not possible.
Roll threaded
118
While moulding thread
parts if the gate mark is to be avoided
on the external surface of the moulding design is used ?
Rotating cavity
119
The threaded core is unscrewed
form the moulding
for of the component.
Ejecting
120
The power system used for actuate the unscrewing mould.
All of these.
121
When the mould is opened
the spaces between
the plates are called as .
Daylight
122
In a stripper
plate mould there will be daylights .
Double daylight
123
The runner striper
plate must be the size as the other
mould plates
same
124
The is located
in guide pillars
fitted in the feed plate
.
Floated cavity plate
125
The movement of floating cavity
controled by .
stop bolts
126
To ensure that sprue is pulled out of sprue
bush are provided
between feed plate
and floating cavity
plate.
Guiding elements
127
If the internal
threads are to be stripped
from the core ,from the thread should
be
thread.
Sruare
128
Long reach nozzle
if used to reduce the length of gate.
Sprue
129
Barb nozzle the blemish
mark left at the injection
point due to conventional sprue
gate.
Reducess
130
The necessity of removing the runner system from the mould is eliminated in
moulds.
Hot runner
131
In hot runner
system the runner
is kept at a temperature as moulding within
the mould .
Elevated
132
The hot runner system the runner is designed inside
the of the mould .
Manifold plate
133
The hot runner
unit is from the rest of the mould parts.
Insulated
134
In hot runner system the sprue is kept at a of the mould.
center
135
Thermoset
injection moulding is made with machine.
Reciprocating screw
136
The cycle tyme for conventional moulding of thermosets material is .
Long
137
The main advantage
of Direct screw transfer is the time cycle.
Shorter
138
The of the part will be more than if a longer cycle is used.
shrinkage
139
The total cycle time consists
of and time.
Mould close and open
140
The mould close time consists
of and time.
Ram forward and cooling
141
Minimum fill tyme achieved by using temperature and pressure.
High
142
Air vents are provided on of the moulds.
Parting surface
143
The minimum crossection area of sprue dependant on .
Mass of part,no
of cavities,flow factor
for the matterial
144
The total area of all gates feed by one sprue should be equal to minimum
cross section area of the .
sprue gate
145
Sticking
of moulding surface
inside the mould is caused
by .
Temperature variation
146
Ejection
pin marks observed
on the surface area of moulding is due to .
All of these.
147
Porocity and voids observed on the surface
area of moulding is due to .
In adiquate venting
148
Sink marks observed
on the surface area of moulding is due to .
Pressure too low
149
Excessive
flash observed on the surface
area of moulding is due to .
All of these.
150
The Ejection force is dependant on .
All of these.
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