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39 Cards in this Set
- Front
- Back
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When rolling heavy gauge material, the inside surface _______ and the outside surface _______ |
Inside - Shrink Outside - Stretches |
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What is the mean diameter? |
The work point where you can then calculate the outside or inside diameters |
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What is heavy gauge considered? |
16g-10g |
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Heavier than 10g is called |
Plate |
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When rolling heavy gauge material there is usually .... |
As much shrinking as stretching |
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Inside diameter of rolled metal (add or subtract) |
Add 1 material thickness |
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Outsise diameter of rolled metal (add or subtract) |
Subtract 1 material thickness |
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A cylinder of 1/8" black iron requires an inside diameter of 16" what would the mean diameter be? |
16 1/8" |
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Soft metal such as ____ and ___ tend to shrink more than they stretch |
Lead and aluminum |
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With soft metals, in 90° bends, you could lose as much as ____% Of the dimension required |
20% |
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When laying out items containing 90° bends, the _______ is often the same dimension as the metal thickness |
Setback |
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Most bend angles are calculated on a ____ ______ centered in the material |
Mean radius |
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For 90° bends, this results in a stretch out of a ______ _______ |
Quarter circle |
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On 90° radius bend, you would calculate the ____ ________ and then divide by ____ for the stretchout |
Mean diameter and divide by 4 |
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A smaller die produces a sharper bend radius, but require ____ ________ |
More tonnage |
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A wider die gives a _____ ________, using less tonnage |
Larger radius |
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A wide die increases the amount of _____ |
Spring back |
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How do you overcome spring back? |
Restriking or over bending |
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By using a die equal to 8 times the thickness of the material you can get ... |
An inside bend radius equal to the thickness of the material |
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When airbending, the inside radius will... |
Bear a definite relation to the nominal width of the bottom die |
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______ _________ is given for metal tensile strength or thickness of mild steel, not for the length of the piece to be cut. |
Shear capacity |
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Press brake capacity is given in |
Tons of pressure |
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What might limit the die width when using a press brake? |
The ductility of the metal and the pressure of the brake. |
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Most common heavy gauge joint weld? Used on what metals? Gap? |
Butt joint, up to 1/8th thick, gap between 1/16th and 1/8th |
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What welded joint for metals over 1/8th? |
Bevel joint, ground or burned on each side to produce a 30° edge on each side to then produce a 60° vee |
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Where to focus heat on a lap joint? |
On the bottom plate so you don't burn away your edge |
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What weld to use on TDC? |
Flange joint |
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When shearing stainless steel, you must remember |
The shear capacity reduces by 4 gauges |
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What is rake angle |
The shearing angle made between the upper shear knife and the lower shear knife of a guillotine style plate shear of iron worker |
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What is air bending? |
The bending method where the material is expected to take it's shape from the amount of depth penetration of the punch |
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Bend angle |
The angle obtained between 2 successive flanges |
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Flange length |
The depth measured from the center of the die opening to the back stop |
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Upper forming tool on press brake? Bottom? |
Top - punch
Bottom - Die |
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3 methods of bending? |
Coining, bottom bending, air bending |
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Aluminum/soft brass: |
.5 |
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Mild steel |
X1 |
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Stainless steel |
1.5 |
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Chromium |
×2 |
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Safe working limit |
×1.2 |
