6.FABRICATION OF HAND OPERATED EDGE FOLDING MACHINE.doc - ABSTRACT In this project we are fabricate the hand operated sheet metal edge folding machine

6.FABRICATION OF HAND OPERATED EDGE FOLDING MACHINE.doc -...

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ABSTRACT In this project we are fabricate the hand operated sheet metal edge folding machine. This equipment needs no electrical power to operate, just using the manual power to bend the sheet metal. This project reduces the cost involved in concern and also avoids the electrical power usage. This project is very useful for small scale industries and workshops. 1
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CHAPTER – 1 INTRODUCTION Sheet metal is simply metal formed into thin and flat pieces. It is one of the fundamental forms used in metalworking, and can be cut and bent into a variety of different shapes. Countless everyday objects are constructed of the material. Thicknesses can vary significantly, although extremely thin thicknesses are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate. Sheet metal is available as flat pieces or as a coiled strip. The coils are formed by running a continuous sheet of metal through a roll slitter. The thickness of the sheet metal is called its gauge. The gauge of sheet metal ranges from 30 gauge to about 8 gauge. The higher the gauge, the thinner the metal is. There are many different metals that can be made into sheet metal, such as aluminum, brass, copper, steel, tin, nickel and titanium. For decorative uses, important sheet metals include silver, gold, and platinum. Sheet metal has applications in car bodies, airplane wings, medical tables, roofs for building and many other things. Historically, an important use of sheet metal was in plate armor worn by cavalry, and sheet metal continues to have many decorative uses, including in horse tack. 2
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CHAPTER – II LITERATURE SURVEY SHEET METAL: Bending Diagram Bending is a metal forming process in which a force is applied to a piece of sheet metal, causing it to bend at an angle and form the desired shape. A bending operation causes deformation along one axis, but a sequence of several different operations can be performed to create a complex part. Bent parts can be quite small, such as a bracket, or up to 20 feet in length, such as a large enclosure or chassis. A bend can be characterized by several different parameters, shown in the image below. 3
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Bending Diagram 4
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The act of bending results in both tension and compression in the sheet metal. The outside portion of the sheet will undergo tension and stretch to a greater length, while the inside portion experiences compression and shortens. The neutral axis is the boundary line inside the sheet metal, along which no tension or compression forces are present. As a result, the length of this axis remains constant. The changes in length to the outside and inside surfaces can be related to the original flat length by two parameters, the bend allowance and bend deduction, which are defined below.
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  • Fall '18
  • BRINDA

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