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Major operations in the manufacture of steel balls used for Ball bearings are givenbelow 
1. Oil lapping
2. Cold heading
3. Annealing
4. Hardening
5. Rough grinding
The correct sequence of these operations is
  • a)
    3,2,4,1,5
  • b)
    3,2,1,4,5
  • c)
    2,3,4,5,1
  • d)
    2,3,5,4,1
Correct answer is option 'C'. Can you explain this answer?
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Ans. (c)
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Understanding the Manufacturing Sequence of Steel Balls
The manufacture of steel balls for ball bearings involves several critical operations, each serving a specific purpose. The correct sequence of these operations is crucial to achieve the desired mechanical properties and surface finish.
1. Cold Heading
- This is the initial operation where steel wire is cut and shaped into rough ball forms using dies.
- It is essential for forming the basic shape and size of the balls.
2. Annealing
- After cold heading, the balls undergo annealing, which involves heating and then slowly cooling them.
- This process relieves internal stresses and improves the ductility of the material.
3. Rough Grinding
- Following annealing, rough grinding is performed to remove excess material and achieve a more precise size and shape.
- It prepares the balls for further refinement and improves their surface finish.
4. Hardening
- Hardening is a heat treatment process that significantly increases the hardness of the balls.
- This step ensures that the balls can withstand heavy loads and high friction during operation.
5. Oil Lapping
- The final operation is oil lapping, which involves polishing the balls with abrasive materials and oil.
- This step enhances the surface finish and reduces friction, ensuring smooth operation in ball bearings.
Conclusion
The correct sequence, therefore, is: Cold Heading (2), Annealing (3), Rough Grinding (5), Hardening (4), and Oil Lapping (1). This sequence (option 'C') ensures that each process effectively prepares the steel balls for the next, resulting in high-quality ball bearings.
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Major operations in the manufacture of steel balls used for Ball bearings are givenbelow1. Oil lapping2. Cold heading3. Annealing4. Hardening5. Rough grindingThe correct sequence of these operations isa)3,2,4,1,5b)3,2,1,4,5c)2,3,4,5,1d)2,3,5,4,1Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Major operations in the manufacture of steel balls used for Ball bearings are givenbelow1. Oil lapping2. Cold heading3. Annealing4. Hardening5. Rough grindingThe correct sequence of these operations isa)3,2,4,1,5b)3,2,1,4,5c)2,3,4,5,1d)2,3,5,4,1Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Major operations in the manufacture of steel balls used for Ball bearings are givenbelow1. Oil lapping2. Cold heading3. Annealing4. Hardening5. Rough grindingThe correct sequence of these operations isa)3,2,4,1,5b)3,2,1,4,5c)2,3,4,5,1d)2,3,5,4,1Correct answer is option 'C'. Can you explain this answer?.
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