lecture_18_-_sheet_metal_forming_-_ch_20

lecture_18_-_sheet_metal_forming_-_ch_20 - ME 350 Lecture...

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ME 350 – Lecture 18 – Chapter 20 SHEET METALWORKING Cutting Operations Bending Operations Drawing or Forming Other Sheet Metal Forming Operations
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Advantages of Sheet Metal Parts High strength Good dimensional accuracy Good surface finish Relatively low cost Economical mass production for large quantities
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Basic Types of Sheet Metal Processes 1. Cutting Shearing to separate large sheets Blanking to cut part perimeters out of sheet metal Punching to make holes in sheet metal 2. Bending Straining sheet around a straight axis 3. Drawing or Forming Forming of sheet into convex or concave shapes
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Sheet Forming Examples Cutting Bending Drawing
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Soft Tooled v. Hard Tooled Processes 1. Soft Tooled (Programmable - Expendable tooling – medium to low volume applications) Laser, Plasma, and Oxy-fuel Cutting Bend Brake Turret Press 2. Hard Tooled (Stamping Dies – high capital investment) Standard Press Brake (manual batch) Stage Tooling (manual line transfer) Progressive Die Transfer Presses
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(1) punch before contact, clearance ‘ c ’ between punch and die (2) punch causes material to (3) smooth cut surface is formed (4) fracture initiated at the opposing cutting edges which separates the sheet. Sheet Metal Cutting Sheet metal cutting examples: Shearing, Blanking, & Punching
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1. Shearing Sheet metal cutting operation along a between two cutting edges Typically used to cut large sheets (a) side view of the shearing operation; (b) front view of power shears equipped with inclined upper cutting blade.
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2. Blanking and Punching Blanking - sheet metal cutting to separate piece (called a ) from surrounding stock Punching - similar to blanking except cut piece is scrap, called a (a) Blanking and (b) punching.
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Clearance in Sheet Metal Cutting
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lecture_18_-_sheet_metal_forming_-_ch_20 - ME 350 Lecture...

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