24 sheet-metal - ME250 Design and Manufacturing I Sheet...

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Sheet metalworking ME250 Design and Manufacturing I
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2 Introduction Cutting Bending Drawing Summary Outline
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3 Introduction Sheet metalworking processes Cold working (room temperature) Done with a stamping press Vast applications Automobile and truck bodies Airplanes railway cars farm and construction equipments Appliances office furniture Computers etc. etc. .
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4 Introduction Sheet metal products
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5 Introduction Sheet metal products
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6 Introduction Sheet metal products
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7 Introduction Sheet metal products
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8 Introduction Stamping press
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9 Cutting Cutting sheet metal by shearing action
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10 Cutting Appearance of a cut edge
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11 Cutting Type of cutting processes shearing
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12 Cutting Sharing machine
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13 Cutting Type of cutting processes blanking punching
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14 Cutting Punching machine http://www.youtube.com/watch?v=g-Ex4Xxk21Q&NR=1
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15 Cutting Clearance too small too large
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16 Cutting Clearance A c : clearance allowance ( for harder materials) t : sheet metal thickness c c A t
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17 F Cutting Die and punch sizes If making a blank of diameter D b die diameter = D b punch diameter = D h = D b - 2 c If making a hole of diameter D h punch diameter = D h die diameter = D b = D h + 2 c
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18 Cutting Cutting force S s : shear strength [MPa] t : sheet thickness [mm] L : perimeter of blank or hole If S s is unknown, approximate as S s ≈0.7 S ut Assumption: Ignoring the effect of c on L entire length L
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This note was uploaded on 03/21/2010 for the course MECHENG 250 taught by Professor Stevis during the Fall '09 term at University of Michigan.

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24 sheet-metal - ME250 Design and Manufacturing I Sheet...

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