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Metal Working Processes, Tools, and Machines

Metal Working Processes, Tools, and Machines ( sheet and small section steel) Eng. Bob Fairchild CHAB Stove Camp The Farm Sept 2012 Raw Materials Plain steel sheet Galvanized steel sheet flat, corrugated, d-rib Stainless steel sheet Plain steel rod, rebar, bar, angle Slotted angle Expanded Metal Hardware cloth Steel pipe, conduit Why Steel? Cheap Durable Takes high temperatures Not too difficult to work Stainless - takes heat better but is harder and much more expensive and less heat conductive Processed materials Stovepipe Steel buckets Steel drums/barrels Stainless steel Cornys Pots and bowls Cast iron grates Measuring and Marking Scale/ruler Tape measure (length and diameter) Square Protractor Scribe (w or w/o blacking and bluing) Pens, pencils Dividers/compass Snap punch Center punch sheet Metal gauge Measuring tools Marking tools Making Holes Church key can opener Twist drills (lousy in sheet Metal ) Step drills (great in sheet Metal ) small Hole saws (bimetal and carbide teeth)

•Twist drills (lousy in sheet metal) •Step drills (great in sheet metal) –small •Hole saws (bimetal and carbide teeth) - large •Hollow punches •Hand punches ... Bending •Pliers benders •Cleat bender •Sheet metal brake •Angle bender . Pliers benders . Bending machines Cleat bender

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Transcription of Metal Working Processes, Tools, and Machines

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MODULE 5 SHEET METAL OPERATIONS

www.rajagiritech.ac.in

Sheet bending Sheet bending is defined as the straining of the metal around a straight axis. During bending operation, the metal on the inner side of the neutral plane is compressed, and the metal on the outer side of the neutral plane is stretched. Bending causes no change in the thickness of the sheet metal.

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INTRODUCTION TO SHEET METAL FORMING PROCESSES

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the bending line is concave. l1 l0 • COMPRESSION-AND-BEND: This mode is associated to flanging operations for which the bending line is convex. l1 l0. ... all other factors influencing sheet metal forming, we should recall that a sheet metal forming operation can always be, from the conceptual point of view,

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Sheet Metal Forming - University of Rhode Island

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Bending Sheet Metal • In bending, outer fibers are in tension while inner fibers are in compression • Bend allowance is the length of the neutral axis in the bend, L b = a (R+kT) • k is a constant that ranges from 0.33 (for R<2T) to 0.5 (for R>2T) • Engineering strain during bending: • As R/T decreases, the tensile strain at outer fiber

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BLANK DEVELOPMENT For Formed Sheet Metal Parts

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For Formed Sheet Metal Parts There are many systems employed by a variety of industries (aircraft, electronics, architectural, automotive, etc.) to account for "what happens in a sheet metal part when bending it from its flat blank state to Its final bent-upform: "Setbacks ", "Bend Allowances " and "K Factors " are somewhat

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Mechanics of Sheet Metal Forming - College of Engineering ...

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sheet metal forming processes. Bending, stretching and drawing of simple shapes are analysed, as are certain processes for forming thin-walled tubing. Where possible, the limits governing each process are identified and this entails a detailed study of tensile instability in thin sheet.

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SHEET METALWORKING

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Sheet-metal Operation . 7. Bending of Tube Stock. 2. Introduction • Cutting and forming thin sheets of metal usually performed as cold working • Sheet metal = 0.4 (1/64) to 6 mm (1/4in) thick • Plate stock > 6 mm thick • Advantage - High strength, good dimensional

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Sheet Metal Forming - Massachusetts Institute of …

web.mit.edu

Bending Force Requirement Punch Workpiece T Die W Force T = Sheet Thickness W = Width of Die Opening L = Total length of bend (into the page) UTS = Ultimate Tensile Strength of material () 2 UTS W LT F= Note: the notation used in the text (L, W) differs from that used in the previous development (b, L).

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SHEET METAL DESIGN GUIDE. - GoProto, Inc.

goproto.com

The most common sheet metal form is a bend. Bends can give strength and shape to a part and are formed in a machine using bend brakes. Since sheet metal cannot be bent to a 90-degree position without breaking at sharp corners, all bends will have an acceptable bend radius. Bends in the same plane should be designed in the same direction.

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