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a lower than the productivity of other automatic processes like rolling This set of Manufacturing Engineering Multiple Choice Questions Answers (MCQs)

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MCQ IN METAL FORMING Q1: The process of forming metal parts using a fluid pressure medium and die constraint is called: ○ A) Forging process ○

[PDF] ROLLING

Roll-strip contact length L • Contact length • Average strip width w – despite the fact that spreading, or an increase in width, may actually occur if edger mills are 

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Candidate must write his Name, Roll Number and sign at the appropriate places marked for this purpose on the front page of this Question Booklet 4 All questions 

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ROLLING

Flat Rolling

Initial thickness ho

Final thickness hf

Roll gap L

Surface speed of rolls Vr

Entry velocity of strip Vo

Final velocity of the strip Vf

Draft: ho hf

Maximum draft possible: ho hf= ȝ2R

Coefficient of friction ȝ

Roll radius R

The strip thickness is reduced at each rolling pass and the strip width increases slightly (around 2%)

Roll Force: F= LwYavg

Roll-strip contact length L

Contact length

Average strip width w despite the fact that spreading, or an increase in width, may actually occur if edger mills are not used Average true stress of the strip in the roll gapYavg Assumes no friction and thus predicts lower roll force than the actual value fhhRL 0

Power per roll (SI units)= ʌ/ 60,000 kW

Where F is in Newtons, L is in meters, and N is rpm of roll

ROLL PRESSURE DISTRIBUTION

Average flow stress:

In rolling:

1)1(0 1 0 nkn kdk Y kY f f n f n ave n f f H H H HH H H f fh h0lnH

PROBLEM

rollforceandthepowerrequired. truestressis280Mpa.

FOUR HIGH ROLLING MILL

PROBLEMS AND DEFECTS IN ROLLED

PRODUCTS

closedupduringtherollingprocesses.

Residual Stresses Developed in Rolling

patterns.

Production of Steel Balls

Ring-Rolling

formedbyring-rolling.

Thread-Rolling Processes

Machined and Rolled Threads

favorablegrainflow.

Cavity Formation in Bar

processformakingseamlesspipeandtubing.

Mannesmann Process

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