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.