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Hot rolling and rolling defects - Nptel

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NPTEL - Mechanical Engineering - Forming

Joint Initiative of IITs and IISc – Funded by MHRD Page 1 of 3

Hot rolling and rolling defects

R. Chandramouli

Associate Dean-Research

SASTRA University, Thanjavur-613 401

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NPTEL - Mechanical Engineering - Forming

Joint Initiative of IITs and IISc – Funded by MHRD Page 2 of 3

Table of Contents

1.Quiz – Key: ... Error! Bookmark not defined.

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NPTEL - Mechanical Engineering - Forming

Joint Initiative of IITs and IISc – Funded by MHRD Page 3 of 3

1.Quiz - Key

1. What is the reason for getting a crown on the rolled strips? What is the remedy for this defect?

Crowning happens due to roll bending and elastic deformation of the rolls. Cambering of rolls is done in order to avoid this defect.

2. What are the effects of front tension in rolling?

Front tension shifts the neutral point towards the entry. It also helps reduce the rolling load.

3. Why are wavy edges formed during rolling of strips?

Wavy edges are caused by roll bending.

4. How does residual stress occur in rolled parts?

Residual stress is caused in rolling as a result of compressive deformation of the strip or sheet.

Large diameter rolls cause residual tensile stress on surface and compressive stress in the interior.

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