how to make a 90 degree bend in a piece of sheet metal aluminum

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  • 7/31/2019 How to Make a 90 Degree Bend in a Piece of Sheet Metal Aluminum

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    How to Make a 90 Degree Bend in a Piece of Sheet Metal Aluminum

    http://www.wikihow.com/Make-a-90-Degree-Bend-in-a-Piece-of-Sheet-Metal-Aluminum

    In the aircraft fields today, sheet metal bends are one of many important structures that help create the

    perfect flying machine. There are a variety of bends that contribute to the aircraft's body to ensure it can

    handle any loads it will eventually encounter. For example, having to land, having to fly through gusts of

    heavy wind, or even having to maneuvre the plane. Aluminum bends are also found within the aircraft to

    help block off parts of the plane, for instance, patches between the empennage and fuselage. The

    aluminum bends are very useful in generating a unique shape, and have been used to make airplanes for a

    very long time. Now, I am going to show you how to make a 90 degree bend in a piece of sheet metal,

    using the tools that most aircraft maintenance workers use in the field.

    Steps

    1 Taking a piece using these dimensions as follows:

    2. Cut a piece of sheet metal, 2 X 4 inches, .040 material thickness and a Bend Radius of .375. You will

    do this by taking any size piece (a relatively good size) and putting it in the cutting machine. But before you

    cut your piece, you need to first take a 6" ruler and mark out your 2 X 4 inch measurements. Afterwards,take your piece over to the cutting machine. Place it in according to your measurements, press down with

    your foot, and it will cut the aluminum. Next, take your piece and lay it out on a table in front of you. Take a

    single-cut file and debur all the sides and corners of your piece, so it's easier to work with.

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    3 Now you're going to mark down a few important measurements on your piece of metal. Before

    you mark anything though, make sure that the grain traveling on your piece is moving in the oppositedirection from when you bend it. Meaning it will be traveling lengthwise. The next few markings that you willput on your piece are important reference points for when you bend the aluminum.

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    A. Mark down your Bend Tangent Lines. These lines are where your bend will begin and end. Tofigure out your Bend Tangent Lines, you will need to figure out your SetbackB.BBbbb

    B. Setback is defined as the distance from your Bend Tangent Line to your Mold Line. To find

    Setback, you add your material thickness and the radius of your bend, times your K value(yourangle, 90 degrees). In this case, (.040 + .375)1.0000. You will get an answer of .415. Now take the2" measurement that we already know from flat side A, and starting from your center line, subtract.415 from it. You will get an answer of 1.585" which you can measure with your 6" ruler. Mark itdown on your piece of metal. This marks your first Bend Tangent line.

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    4. Next, you need to calculate your Bend Allowance. The Bend Allowance is defined as the

    amount of material used for the bend, and is determined by using the following formula: BA=(0.0173(BR) + 0.0078(MT)). For bends 1-180 degrees, this formula is used. Inputting our valuesinto the equation, we end up with an answer of .617. The use of a table can also help us find BendAllowance. Now measure .617 from your first Bend Tangent line, then mark it. Draw another linewhich will give you your second Bend Tangent line.

    5. Walk over to the brake. You will need to set the brake in order to bend your piece of sheet metal. Place

    your piece upward in the brake. Adjusting the handles behind the brake and the handles on the clamping

    bar, will slowly start to move and tighten around your piece. Continue to do so until you can't pull out your

    piece of sheet metal.

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    6. First lift the clamping bar, then slide your piece in underneath your radius. Slide it under

    until you reach your sight line. Look down or use your 6" ruler to make sure your sight line isdirectly under your radius. Clamp down the bar to tighten your piece in place

    7. Slowly lift up the folding leaf to start bending. You will need to lift up the folding leaf far

    enough so your piece passes the 90 degree mark. You need to do this in order to avoid spring

    back. If you were to just bend it to the 90 degree mark and take it out, your piece of metal wouldslowly bend backwards and you would need to bend it again. So in order to save you from thattrouble, we will bend the piece of sheet metal further to ensure it will come out 90 degrees.

    8. Once you have bent the piece of sheet metal, put down the folding leaf to its original spot

    and lift up the clamping bar. Take out your piece and walk over to a flat surface. Place yourpiece flat on each side and measure with your 6" ruler to see if it's a perfect 90 degree angle. Ifyour piece happens to be a bit past the 90 degrees, pull it back a bit then measure it again.Congrats! You have now created a 90 degree bend in a piece of sheet metal.