Grinding Skill Qualification Assessment Question Bank

Author: Chief Editor: Yin Zuoilu
Publisher:
Publish Date: 2000-01-01
Features: A supplementary textbook for beginners, intermediate, and advanced grinding operators, covering: basic knowledge of grinding; grinding of external cylinders, internal cylinders, conical surfaces, planes, simple cutting tools and formed surfaces, and threads; grinding of medium-complexity parts and high-precision, high-difficulty parts; new grinding processes; finishing; CNC grinding and new structures of grinding machines; precision measuring instruments; superhard abrasive grinding wheels; process planning and grinding process analysis; grinding machine structure, transmission system, accuracy inspection, and their impact on machining accuracy. This question bank can be used by various skill assessment institutions for organizing assessments and can also be used by workers for self-study and review.
Excerpt:
89. When grinding deep holes and heat-treated holes, the allowance should be smaller. ( )
90. Center holes with protective cones are often used for high-precision workpieces, long processing processes, or those requiring multiple regrinding. ( )
91. In internal cylindrical grinding, the wheel diameter is smaller, and under the same peripheral speed, the grinding grains participate in cutting 10 to 20 times more per unit time compared to external cylindrical grinding. ( )
92. Conical surface parts have higher centering accuracy and can achieve higher coaxiality. ( )
93. The angle between two generatrices measured on a cross-section containing the cone axis is called the cone's slant angle. ( )
94. Morse cones are commonly used for the headstock spindle taper hole and tailstock sleeve taper hole. ( )
95. When grinding external conical surfaces with a half-cone angle ≥9° on a M1432A universal external cylindrical grinder, the upper worktable can be rotated. ( )
96. When rotating the headstock to grind an external conical surface, the workpiece cannot be mounted. ( )
97. When grinding an external conical surface by rotating the wheelhead angle, the worktable can perform longitudinal motion. ( )
98. Cone accuracy inspection includes shape, size, taper (or angle), and large/small end diameters. ( )
99. Measuring a cone workpiece with a cone angle of 10°30′↑（＋2）↓0＇ can use a vernier universal angle with a division value of 2＇. ( )
100. Grinding external conical surfaces by rotating the upper worktable can achieve high accuracy and is widely used. ( )
101. When using an angle dresser to grind a conical surface, the wheel width should be greater than the length of the conical surface. ( )
102. When the cone slant angle of the workpiece exceeds the rotation angle of the upper worktable, the headstock angle rotation method can be used to grind the conical surface. ( )
103. High-precision workpiece tapers can be measured using sine bars and dial indicators. ( )
104. For batch production of workpieces with low taper angle requirements but large angles and short lengths, specialized angle gauges can be made based on the angle size for measurement. ( )
105. The feature of metric cones is a constant taper, making them easy to remember. These cones are generally used for the spindle holes of large machine tools. ( )
106. When inspecting a finished conical surface with a cone gauge, the contact area can be no more than 75%. ( )
107. When the cylindrical and conical surface accuracy requirements on a workpiece are the same, the conical surface should generally be ground first. ( )
108. Morse taper is divided into 7 numbers, with varying sizes but equal angles. ( )
109. The main reason for hyperbolic errors when grinding cones is the inequality in height between the wheel rotation axis and the workpiece rotation axis. ( )
110. Striae in the form of straight waves on the cone workpiece surface are mainly caused by wheel imbalance. ( )
111. Due to large thermal deformation when grinding planes with the wheel end face, a resin-bonded wheel with fine grain and relatively hard hardness should be selected. ( )
112. In surface grinding, the longitudinal feed speed of the worktable can generally be increased to improve heat dissipation and production efficiency. ( )
113. When grinding planes with the wheel end face, tilting the headstock by a small angle reduces the contact area between the wheel and workpiece, improving heat dissipation. ( )
114. The transverse grinding method is suitable for grinding long and wide workpiece planes. ( )
115. The peripheral speed of the wheel in surface grinding should not be too low, generally around 35 m/s. ( )
116. In surface grinding, a wheel with low hardness, coarse grain, and loose organization should be used. ( )
117. When clamping small and thin workpieces with an electromagnetic chuck, no is needed. ( )
118. When dressing the electromagnetic chuck table surface, the chuck should be connected to the power supply.