The different bending tools
The uses of twisting and scroll bending
The prevention of defects in bending
Bending✌👰
Bending is a method of chipless shaping by which the external grain structure is lengthened 👉while the internal grain structure is shortened.
Types of bending
Bending to curve
Bending to an angle
BENDING TOOLS
Vice or anvil edge
An angle bend may be hammering in a vice or over the edge of an anvil.
Bending block
Bending blocks with lever and pegs are very convenient to use in a smithy. These are massive blocks pierced with holes in which pegs can be inserted. The work to be bent is placed between a series of pegs, already inserted in the holes, and the work is bent with a lever.
Tool inserted in a hardle hole
Some of the bending tools, like ring, mandrel are inserted in the hole of the anvil for bending the workpieces
Beak of the anvil
Curving of the workpieces can also be carried out on the beak of the anvil
Bending links
Bending links with top fullers are used for small radius, pipe clips, tools
Fork tools
A fork is used for bending round steel bars.
Bolster swages
Bolster swages are used for bending hooks of flat and round steel bars.
Bending dies
Bending dies with top fullers are used for bending flat or round bars at right angles.
Twisting
Twisting is done to give additional strength and to change the position of the piece so that it can be fastened at the ends. M. S Flat 6mm or less in thickness and 40mm or less in width can be twisted cold. Squre rods of M. S up to 12mm can be twisted without heating. To twist larger sizes of stock, the metal should be heated to a dull red colour.
Scroll bending
A scroll is a piece of metal which has been bent to a circular shape to form a spiral. It is used mainly for decorative purposes. Scrolls may be formed by using jigs, forks, and scroll bending devices.
BENDING DEFECTS AND THEIR PREVENTATION
The following defects may occur during bendiMETAL
RUPTURE OF THE METAL
This occurs either if the stock has cooled down during bending or it has not been properly heated before the bending was started.
The work becomes thinner at its bending points if the work is not upset before bending.
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