Latest Manufacturing and Industrial Engineering Interview Questions Part – 2
67. Result of optimum cutting clearance will be….?
Maximum cut band.
68. Result of excessive cutting clearance will be …?
Maximum edge radius.
69. Result of insufficient cutting clearance will be…?
Maximum break edge.
70. Punch determines….?
Piercing size
71. Die determines …?
Blanking
72. Calculation of cutting clearance ?
Sheet metal up to 3mm = C*S* root of (TMAX/10)
Sheet metal more than 3 mm=(1.5*s) *(s-0.015)* root of (TM ax /10)
73. What is called land ?
To avoid jamming of material inside the die ,we give straight portion of certain amount from the cutting edge. That is called land.
74. For sheet metal S up to 3 mm = land will be….?
3mm
75. For sheet metal more than 3 mm = land will be…?
Sheet thickness.
76. Usually ,angular clearance is provided in … Degree ?
1.5 degree /side.
77. Generally, soft material require… Angular clearance ?
more.
78.What are the types of guide plate tool ?
Open guide plate tool
Stripper guide plate tool
79. Name the basic elements of tool ?
Punch and Die.
80. Punch and die materials ?
Good quality alloy steel(HcHcr ,D2).
81. Hardness of punch ?
58-60 HRC.
82. Hardness of die ?
60-62 HRC.
83. Stripper plate material ?
MS or medium carbon steel
84. Thrust plate material ?
OHNS.
85. Hardness of thrust plate ?
45-48 HRC
86. Top plate and bottom plate material ?
MS or Cast iron.
87. Screws are to ……… the parts ?
hold
88. Dowels are to ………. the parts ?
align
89. Name the types of cold rolled stock materials used ?
Hard, Three quarter hard, Half hard, Quarter hard, Soft, Dead soft.
90. What is the specialty of hard sheet metal ?
Can not bend.
91. What is the specialty of 3 quarter hard material ?
Can bend 60 degree across the grain.
92. Specialty of half hard material ?
Can bend 90 degree across the grain.
93. Quarter hard material ?
Can bend 180 degree across and 90 degree along the grain direction.
94. Soft material ?
Can bend 180 degree across and along.
95. Dead soft material ?
Can be formed into different shapes.
96. What is strip lay out ?
A layout which gives sequence of works and operations.
97. What are the factors effecting a strip layout ?
Shape of the blank, production requirement, grain direction, burr side, stock material.
98. Formula of economic factor ?
(area of the blank*no. of rows )/(pitch*scrap width )
99. What is pitch ?
Distance between two consecutive operations.
100. What is scrap bridge ?
Portion of the material remaining between two adjacent openings.
101. Scrap bridge nearer to the operator called …. scrap ?
Front scrap
102. Scrap bridge away from the operator called …. scrap?
Back scrap
103. What are the types of strip layout ?
Single row layout, double row, gang dies and angular.
104. Name the types of single raw layout ?
Narrow run, wide run
105. List about the types of punches ?
Cutting punch, non cutting punch and hybrid punch.
106. What are the groups of punches ?
Segregated punches and integrated punches.
107. What is segregated punch ?
Self mounted by screwing etc.
108. What are the integrated punches ?
Mounting with the help of punch plate etc.
109. For beveled head punch bevel angle is ………?
30 to 45 degree
110. What is perforator?
Punch of diameter 2mm and below.
111. What is bucking force ?
Maximum force a punch can withstand without bucking.
112. Formula for buckling force ?
Fb =(ii2EI)/LP2
113. Modulus of elasticity of Steel ?
200 to 220 GN/M2
114. Unit of moment of Inertia ?
Mm4
115. The ultimate condition of buckling force is ……..?
Buckling force =cutting force require for the operation =shear force on the punch
116. Material of solid die ?
Non shrinking tool steel.
117. Die bushes are inserted in …..?
mid steel retainer plate.
118. Dies having more than one section called ….?
Split dies
119. Material of carbide dies ?
Tungsten carbide
120. What is the function of stopper ?
Arrest the movement of the strip for one pitch length after each stroke.
121. Fundamental principles of stopper ?
Stop position and registry position.
122. What is stop position ?
Actual position of the stopper.
123. Describe registry position ?
Exact position where strip has to be established.
124. Types of strippers?
Fixed and traveling
125. Function of stripper ?
Strip the stock material off the punches after each stroke.
126. Tunnel width formula ?
X = w + f
w = stock strip width at maximum tolerance
f = desired horizontal feeding clearance
127. Hook pins are made from ……….?
Cold drawn steel rod
128. Gauge thickness for the material up to 1.5 mm is …. ?
3mm
129. Gauge thickness for the material more than 1.5 mm is … ?
Sheet thickness +1.5 mm
130. Prevention of wrong loading can be done by… ?
Fool proofing