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Video instructions and help with filling out and completing Can Form 2220 Historical

Instructions and Help about Can Form 2220 Historical

The ingenious design of the aluminum beverage gap every year nearly a half trillion of these cans are manufactured that's about 15,000 per second so many that we overlook the cans superb engineering let's start with why the can is shaped like it is why a cylinder an engineer might like to make a spherical can it has the smallest surface area for a given volume and so it uses the least amount of material and it also has no corners and so no weak points because the pressure in the can uniformly stresses the walls but a sphere is not practical manufacture and of course it'll roll off the table also when packed as closely as possible only seventy four percent of the total volume is taken up by the product the other twenty six percent is void space which goes unused when transporting the cans or in a store display an engineer could sell this problem by making a cuboid shaped cam it sits on a table but it's uncomfortable to hold and awkward to drink from and well easier to manufacture those sphere these edges are weak voids and require very thick walls but the cuboid surpasses the sphere and packing efficiency it is almost no wasted space although with the sacrifice of using more surface area to contain the same volume as the sphere so to create a can engineers use a cylinder which has elements of both shapes from the top it's like a sphere and from the side it's like a cuboid a cylinder has a maximum packing factor of about 91 percent not as good as the cuboid bit better than the sphere most important of all the cylinder can be rapidly manufactured the can begins as this disc called a blank punch from an aluminum sheet about three tenths of a millimeter thick the first step starts with a drawing die on which sits the blank and then a blank holder that rests on top well look at a slice of the die so we can see what's happening a cylindrical punch presses down on the die forming the blank into a cup this process is called drawing this cup is about 88 millimeters in diameter larger than the final can so it's redrawn that process starts with this white cup and uses another cylindrical punch and a redrawing die the punch presses the cup through the redrawing die and transforms it into a cup with a narrower diameter which is a bit taller this redrawn Cup is now the final diameter of the can 65 millimeters but it's not yet tall enough a punch pushes this redrawn Cup through an ironing ring the cup stays the same diameter as it becomes taller on the walls thinner if we watch this process again up close you see the initial thick wall and then the thinner wall after it's ironed ironing occurs in three stages each progressively making the walls thinner and the kam taller after the cup is ironed the dome on the bottom is formed this requires a convex doming tool and a punch with a matching concave indentation as the punch presses the cup downward into the doming tool the cup bottom then deforms into a dome that dome reduces the amount of metal needed to manufacture the can the dome bottom uses less material than if the bottom were flat a dome is an arch revolved around its inner the curvature of the arch distributes some of the vertical load into horizontal forces allowing a dome to withstand greater pressure than a flat beam on the dome you might notice two large numbers these de bas numbers are engraved on the doming tool the first number signifies the production line in the factory and the second number signifies the body maker number the body maker is the machine that performs the redrawing ironing and doming processes these numbers help troubleshoot production problems in the factory in that factory the manufacturing of can takes place at a tremendous rate these last three steps redrawing ironing and doming all happen in one continuous stroke in an only 1/7 of a second the punch moves at a maximum velocity of 11 meters per second and experiences a maximum acceleration of 45 G's this process runs continuously for six months for around a hundred million cycles before the machine needs servicing now if you look closely at the top of the cam body you see that the edges are wavy and uneven these irregularities occur during the forming to get a nice even edge about six millimeters is trimmed off of the top with an even top Han could now be sealed but before that sealing occurs a colorful design is printed on the outside the term of art in the industry is a decoration the inside also gets a treatment a spray coated epoxy lacquer separates the cans contents from its aluminum walls this prevents the drink from acquiring a metallic taste and also keeps acids in the beverage from dissolving the aluminum the next step forms the cans neck the part of the can body that tapers inward this necking requires 11 stages the forming starts with a straight walled cannon the top has brought slightly inward and then this is repeated further up a Ken wall until the final diameter is reached the change in neck size at each stage is so subtle that you can barely tell a difference between one stage in the next each one of these stages works by inserting an inner die into the can body then pushing an outer dyeing called the necking sleeve around the outside the necking sleep attracts the inner diary tracks and the can moves to the next stage the neck has drawn out over many different stages to prevent wrinkling or pleading of the thin aluminum since the 1960's the diameter of the cannon has become smaller by.

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