Talk:Shearing (manufacturing)

Merge from Guillotine
Same topic doesn't need to be covered in two articles. Wizard191 (talk) 02:05, 17 July 2008 (UTC)
 * Done --Wizard191 (talk) 18:29, 31 August 2008 (UTC)

Merge from Punching
When I created this article I didn't realize that the punching article existed. I think that the punching article should be merged into this one because, as far as I know, shearing is the proper term. The term "punching" isn't in my source (Degarmo), so I believe it's just a slang term. I don't want to just make that assumption though. Wizard191 (talk) 22:36, 23 July 2008 (UTC)
 * I'm glad I didn't just make that assumption because the Machinist's Handbook refers to it as punching. Please weigh in on which way this should go. Wizard191 (talk) 22:39, 23 July 2008 (UTC)

comment: Punching is where you punch a hole by forcing a punch through the material, leaving a hole. You use a punch and die and some force applicator. Shearing is where you cut the metal by using the two blades, or a blade and anvil, leaving a cut. Though they are both cold working processes, they acheive very different results and use different machinies and techniques. They shouldn't be merged, unless into one over-arching page that details all cold metal forming processes - and that would be silly. —Preceding unsigned comment added by 217.14.182.28 (talk) 16:12, 11 December 2008 (UTC)


 * I have a class in which we are studying manufacturing processes, our book has a great taxonomy. The teacher is having us update Wikipedia with the information but i am a little worried about the copyright issues so I will just mention that it would be great if we could get it online free to use! He is the co-author of the book and is working on asking permission and may have my manufacturing class post as much information as possible this book puts punching under piercing under separating(shear) but not under shearing itself. Hopefully he will get permission soon. The Book is Manufacturing Processes Reference Guide Kenmanu (talk) 06:04, 16 January 2009 (UTC)


 * While that source lists it that way, I'm actually looking at it as shearing processes as a whole. As far as I understand it, punching refers to the same processes, just using a different term. Feel free to cite from your book, but don't copy text directly from it. Wizard191 (talk) 04:36, 18 January 2009 (UTC)
 * I Vote not to merge. Punching and shearing are two distinct process in metal working.  In shearing a work piece is captured between two square edged blades that apply a shear stress to the material, causing it to fracture.  Punching is a die stamping process in which a closely fitting punch and die are used to cut a piece of material out of the work piece.  Punching makes holes, shear cuts to length or shape.  Also, punching is a precision manufacturing process and shearing typically is not, save for some specialty applications.  The only similarties of punching and shearing are, 1. a reciprocating cutting tool, and 2. cutting material by applying a shear stress.  Shearing is much closer to slitting, than it is to punching.  12.4.27.248 (talk) 13:37, 4 June 2009 (UTC)  (forgot to sign in) Iepeulas (talk) 13:55, 4 June 2009 (UTC)

Comment on the now closed "Merge from Punching" section
Although two or three contributors in the now-closed "Merge from Punching" section above say that shearing is straight line and punching is not, the actual article applies the term shearing to both straight and non-staight processes. It refers frequently to punches and dies, which by definition produce holes in the parent material, i.e. cannot be merely straight blades. Straight blades would surely not be called a punch and a die - they are just two blades. I quote from the article as it currently reads: UBJ 43X (talk) 16:34, 18 January 2017 (UTC)
 * "Shearing-type operations include: blanking, piercing ..." [the Blanking and piercing article shows non-straight cutting]
 * "A punch (or moving blade) is used to push a workpiece against the die (or fixed blade)" [punches and dies by definition produce closed outlines]
 * "shear stresses between the punch and die"