Sizing is a operation performed at Sizing is a operation performed at temperature below the melting temperature below the melting point to finish the surface of work-point to finish the surface of work-piece to ensure better dimensional piece to ensure better dimensional accuracy and surface finish.accuracy and surface finish.

It minimize the thickness of the It minimize the thickness of the metal.metal.

Sizing operation performed in open Sizing operation performed in open die.die.

It is mostly It is mostly used to used to give a give a forged or forged or cast part cast part better better dimensiondimensional al accuracy.accuracy.

When we performed sizing When we performed sizing operation on work-piece the sized operation on work-piece the sized surface of the work-piece gets surface of the work-piece gets denser and stronger.denser and stronger.

Sizing operation pressure is Sizing operation pressure is determined by area to be sized.determined by area to be sized.

It is usually performed on semi-It is usually performed on semi-finished parts or parts that finished parts or parts that require an accurate surface finish.require an accurate surface finish.

It is a special type of closed It is a special type of closed die forging.die forging.

In this process work is In this process work is completely confined. Both completely confined. Both surfaces of the work receive surfaces of the work receive impressions.impressions.

It is flashless operation.It is flashless operation.

Coining can be done using a gear Coining can be done using a gear driven press, mechanical press, or driven press, mechanical press, or more commonly a hydraulically more commonly a hydraulically actuated press.actuated press.

Coining require higher tonnage Coining require higher tonnage presses than stamping.presses than stamping.

Part produce by coining operation Part produce by coining operation like: coins, medals, badges, buttons.like: coins, medals, badges, buttons.

It is a special type of forging.It is a special type of forging.This process uses a matched This process uses a matched punch and die.punch and die.

It is a open and closed die It is a open and closed die forging.forging.

The material flows in the The material flows in the direction of applied forces.direction of applied forces.

Embossing operation is a commonly Embossing operation is a commonly accomplished with a combination of accomplished with a combination of heat and pressure. heat and pressure.

CharacteristicsCharacteristics Embossing operation is a ability to Embossing operation is a ability to

form ductile metals.form ductile metals.The ability to produce unlimited patterns, depending on the dies.

In this process, the bar stock is reduced In this process, the bar stock is reduced in cross-section or undergoes change in in cross-section or undergoes change in cross-section when it is passed through cross-section when it is passed through a pair of grooved rolls made of die a pair of grooved rolls made of die steel. This process serves as the initial steel. This process serves as the initial processing step for forging of parts processing step for forging of parts such as connecting rod, crank shaft etc. such as connecting rod, crank shaft etc. Finished products like tapered shafts, Finished products like tapered shafts, leaf springs can also be made. leaf springs can also be made.

In this process the rolls are not completely In this process the rolls are not completely cylindrical but are sector shaped to permit cylindrical but are sector shaped to permit the stock to enter between the rolls.the stock to enter between the rolls.

These roll segments have one or more These roll segments have one or more sets of grooves to impart a desired shape sets of grooves to impart a desired shape to the piece being forged.to the piece being forged.

When the rolls are in open position, the When the rolls are in open position, the heated stock is advanced up to a stop. As heated stock is advanced up to a stop. As the roll rotate, they grip and roll down the the roll rotate, they grip and roll down the stock.stock.

First the work piece is fed into the First the work piece is fed into the rolls at the correct place in the roll's rolls at the correct place in the roll's revolution. The rolls turn, acting to revolution. The rolls turn, acting to pull the work into the gap. As the pull the work into the gap. As the work piece is fed through the work piece is fed through the grooved portion of the roll's grooved portion of the roll's revolution, the compressive forces revolution, the compressive forces form the material into the desired form the material into the desired shape.shape.

So, the bar stock can be increased in length, So, the bar stock can be increased in length, reduced in diameter and changed in section as reduced in diameter and changed in section as desired.desired.

Roll forging manufacture is often used in the Roll forging manufacture is often used in the automotive industry to manufacture parts. Shafts automotive industry to manufacture parts. Shafts of various geometries, hand tools and leaf of various geometries, hand tools and leaf springs, are some products commonly springs, are some products commonly manufactured by this process.manufactured by this process.

Parts created by roll forging possess superior Parts created by roll forging possess superior mechanical properties than those produced from mechanical properties than those produced from many other processes.many other processes.