Question

Use of lubricant at die-work interface ) in open die forging reduces: A. Life of die (toolins B. Surface finish C. Work surface oxidation D. Barreling ) Swaging is accomplished by A. Rotating workpiece B. Rotating dies C. Fixed dies D. None of above Which of the following rolling mill is associated with relatively smal diameter rolls: A. Cluster mill B. Continuous rolling mill C. Reversing mill D. Three high mill Production of seamless pipes is associated with which of the following: A. Ring rolling B. Roll forging C. Roll piercing D. Upsetting Which of the following is closely related to open die forging: A. Coining B. Flashless forging C. Fullering D. Impression die forging.

Answer 1

When multiple questions are asked, as per Chegg guidelines we have to answer the single first question only. Therefore, iam providing the answer to first question here.

The question is from open die forging process. We need to find the effect of using lubricant reduces ------- at die work interface.

Answer: Barreling

Reason:

open die orig Lower die shown in above FIguve, in open- die orging ocess, deformaion plocess is caonied out yto Fla es.le can see that, heightf the cylinder is γeduced and its while Rts dtametes increased n open-die fosging, theve is no constraint to material flou in sidewou disnecton. The sefore, open -die foging Process, we ohserve f rictionol

the wok die interfaces due butusaMd Flow of the This s calle& as "Basreiting Th enero. e, tost educe the bavelt ing ertectuse need to resuce the frictional forces nlhich s Quie possible by use EFfective lub at Lo00K-die interface gain uoe haue tuo ypes of wooking operations e, cold workin and hot wo γ King. In cold working opesaton the bavgling can be minimied by using lubricants . wlhereas, in h woaking hWe can use heated dies Fo minimi2ing basgeling life of die use of Lubvicants im proves the Life of the die .

Surface Gnish se of lubricant at u00TK-dte interfaco contribute to imprOue Surlac finish due to educed prictonal effecr Use lubricants improue the Thesefore correct answer S Baselin

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