WorksheetsPress Tool Technology - Fill in the Blanks
Total questions: 96
Worksheet time: 48mins
Punches mounted in punch holders are subjected to ________ stresses.
Compressive
Tensile
Shear
Bending
Thin punches buckle if ________ involved are not considered.
Stresses
Forces
Dimensions
Temperatures
The Ultimate condition is when Buckling force is _____ to Cutting force.
Equal
Greater
Less
Unrelated
Buckling is a ________ deflection.
Lateral
Vertical
Axial
Rotational
Buckling calculation is used to find _____ diameter in a sheet metal.
Piercing
Blanking
Drawing
Notching
Deep drawing is characterised by _____ flow.
Metal flow
Water flow
Air flow
Heat flow
Volume of component and Blank are ________ in deep drawing process.
Same
Different
Variable
Zero
There is ______ in cross section of component in successive draws.
Reduction
Expansion
Distortion
Elongation
Corners of cylindrical components undergo ________.
Bending
Shearing
Torsion
Compression
______ compression acts on flange area of component.
Circumferential
Axial
Radial
Longitudinal
The straight walls of drawn component are in ________.
Tension
Compression
Shear
Bending
Thickening of component takes place at ______ area.
Flange
Web
Rib
Base
Formula for drawing force is ________.
σu+σy/2xA
σu−σy/2xA
σu×σy/2xA
σu/σy×2A
Drawing force can be calculated using the formula ________.
σu+σy/2xA
σu-σy/2xA
σu×σy/2xA
σu/σy/2xA
______ capacity of the press is used by blank holder.
One third
Half
Two thirds
One fourth
Low blank holding force leads to ______ formation.
Wrinkle
Crack
Tear
Fold
The recommended blank holding force varies from ________.
80 to 200N/mm2
20 to 50N/mm2
200 to 400N/mm2
500 to 800N/mm2
High blank holding force leads to ________.
Tearing
Wrinkling
Cracking
Springback
Blank holding force is not required when d/D is greater than or equal to ____.
0.2
0.5
0.8
0.1
Too large clearance will result in ________.
wrinkles
tearing
hardness
cracks
Too small clearance will result in ________.
tearing
bending
cracking
wrinkling
Normally ___% to ___% of the metal thickness is allowed as clearance.
7 to 20
1 to 5
20 to 35
35 to 50
The draw beads reduce the ________ pressure.
blank holding
hydraulic
atmospheric
vapor
Draw beads are the small projections on the ________ of draw die.
Surface
Edge
Base
Handle
Air vent should be provided in the punch and the die to eliminate ________.
air pockets
oil leakage
metal corrosion
tool wear
Drawing compounds used in deep drawing are known as _________?
boundary lubricants
coolants
adhesives
solvents
Deep drawing is in the high pressure on the order of ________ PSI.
1,00,000
10,000
50,000
5,000
The ratio H/h is a measure of ________ strain.
tensile
shear
compressive
volumetric
The number of draws can be determined on the value of ________ ratio.
d / D
D / d
d + D
D - d
Metal to metal adhesion in deep drawing can be prevented by ________.
lubrication
heating
painting
welding
Metal to metal adhesion is otherwise known as ________.
welding
soldering
brazing
gluing
If two sheets are positioned one over the other while drawing ________ may occur.
Lamination
Cracking
Warping
Blistering
Bulges will occur if the ________ is more.
draw clearance
die angle
lubricant viscosity
blank thickness
Square boxes can be drawn to a depth of approximately ___% of the width.
80
50
60
100
A part can be drawn in one station to a depth of 4 to 6 times the ________.
corner radius
diameter
thickness
length
The force required for rectangular drawing, P= ________.
P= σ s (2π R c1 + Lc2)
P= σ s (π R c1 + Lc2)
P= σ s (2π R c1 - Lc2)
P= σ s (2π R c1)
Inadequate venting will lead to ________ marks.
blister
burn
scratch
pin
If the punch is not located ________ the shell will fracture.
centrally
randomly
externally
internally
Wrinkles occur at the ___________ of the blank.
Edge
Center
Surface
Corner
Wrinkling can be avoided or rectified by _________.
using draw beads
increasing lubrication
reducing blank holder force
using thicker sheets
Counter drawing is also known as _______________.
Reverse drawing
Contour drawing
Blind drawing
Gesture drawing
The draw punch force acts from below through the active ________.
Draw cushion
Die block
Blank holder
Ram
Another method of redrawing the shell is ______________.
Ironing
Casting
Forging
Extrusion
Ironing is used to correct the ____________ of the wall.
Thickness
Color
Height
Texture
______________ is the method of redrawing the shell to improve surface finish and reduce wall thickness.
Ironing
Blanking
Deep Drawing
Spinning
The process of producing small diameter cups by drawing is _______________.
Eyelet drawing
Deep drawing
Spinning
Extrusion
The depth of the shell is __________ compared to its diameter.
More
Less
Equal
Negligible
Statistics helps us to predict __________ within certain limits.
Variation
Accuracy
Certainty
Randomness
Variation is ____________ in nature.
Inherent
Artificial
Temporary
External
Variation follows __________ distribution.
Normal
Poisson
Binomial
Uniform
______________ is done to ensure that the variation is kept at a minimum.
Process capability
Quality audit
Root cause analysis
Preventive maintenance
Normal distribution is smooth & _______ shaped.
Bell
Square
Triangle
Flat
Difference between each interval from the mean, corresponds to the _____________.
Standard deviations
Median
Mode
Range
In +σ band ________% of observations are expected to lie.
68.27%
50%
95%
99%
95.45% of all observations are expected to lie in _________
+2σ
+1σ
+3σ
+4σ
In +3σ band ________% of observations are expected to lie.
99.73%
95%
68%
90%
The measure of central tendency is called as _____________________.
Arithmetic mean
Median
Mode
Range
The ratio of expected capability and actual capability _________________ .
process capability index(cp).
mean deviation.
control chart.
standard deviation.
Formula for process capability index is _____________________.
Cp=specification tolerance / process capability
Cp=process mean / specification tolerance
Cp=process capability / specification tolerance
Cp=process mean / process capability
The process is considered to be capable when the index is _______________.
1.33
1.00
2.00
0.67
Cpk index considers both ____________________ and ____________________ in evaluating the process capability.
process variability & process centring
process mean & process range
process limits & process tolerance
process output & process input
Cpk is given by_______________
X-LSL/3sigma (or) USL-X/3sigma
(USL-LSL)/6sigma
(X-USL)/3sigma
(LSL-X)/3sigma
When Cpk index is 1.33, or more the capability limits would be__________.
+4b(sigma)
+3b(sigma)
+2b(sigma)
+1b(sigma)
Commonly used measures of dispersion are_______________
Standard deviation range
Mean median
Mode quartile
Sum average
After the cutting impact in a press the deflection leads to ______________ of punch.
Misalignment
Sharpening
Lubrication
Alignment
If the alignment is not correct ______________ is produced.
Friction
Heat
Noise
Vibration
Improper cleaning of the tool will lead to _________________
Tool wear
Tool sharpening
Tool painting
Tool balancing
The punches are subjected to wear ________ times as fast as the die plates.
Three
One
Five
Ten
After grinding a die plate or a punch, ______________ are formed around the cutting edges.
Featheredges
Burrs
Grooves
Cracks
Feather edges are removed by means of ________________.
Oilstones
Files
Sandpaper
Chisels
If the slugs shift on to some cutting edges, ________________ may break.
Punches
Dies
Bolts
Springs
The tool must be located on the ________________
Bolster plate
Ram
Die shoe
Punch holder
Always ________________ the punches after resharpening
Demagnetize
Lubricate
Polish
Heat
Always use non-magnetic materials for ________________.
Die member
Punch
Stripper
Bolster
Inaccurate feeding causes the cutting of ________________.
Half blanks
Full blanks
Scrap pieces
Finished products
Sectional die plate is also called as ________________
Solid die plate
Split die plate
Adjustable die plate
Round die plate
In a __________ die there are three main tool members
Drawing
Blanking
Piercing
Forming
In drawing operations, __________ creates a film between the stock and the tool member.
lubrication
oxidation
corrosion
adhesion
The slug causes ____________ of die opening and slug lifting.
clogging
expansion
cooling
shrinking
The __________ causes clogging of die opening and slug pulling.
slug
punch
stripper
blank
Punch wears at approximately the __________ rate as the die block
same (or) twice as fast
half the
quarter the
ten times the
The wear will be __________ for piercing punches than for blanking punches
Greater
Lesser
Equal
Negligible
The __________ finish and the __________ finish are important for the die efficiency.
smooth & layoff
rough & layoff
smooth & rough
polished & layoff
Piercing and Notching operations are carried out ________ bending
Before
After
During
Instead of
Multi-station transfer presses are equipped with __________ stations
Forming
Cutting
Welding
Painting
A key anchored in __________ prevents rotation of the collared pins.
Bottom bolster
Top die
Guide bush
Ram
The tool is provided with a __________ between the collared cropping pins
scrap cutter
hammer
wrench
drill
The pressure pad in bending die is in the __________ stage
Fifth
First
Second
Fourth
The second bending stage lips the freed arm for _________________ .
Curling
Welding
Cutting
Pressing
The cut band increases in width due to ____________ and ______________ of central arm.
Bending & curling
Stretching & shrinking
Twisting & folding
Heating & cooling
The pivot pin should be strong enough to withstand _________________ .
Bending force
Shear force
Tensile force
Compressive force
Grinding cutting stages for re-sharpening ____________ cutting die height.
Decreases
Increases
Maintains
Doubles
To avoid bending it is necessary to provide ________ under the cutting die.
shim
bolt
washer
nut
All the drawing stations are provided with _______________.
Die cushion
Punch
Blank holder
Guide pin
The re-sharpening allowance of new drawing punches is ______.
3 mm
1 mm
5 mm
0.5 mm
The top tool is provided with the ________ stripper which holds the strip.
Spring
Rubber
Plastic
Metal
