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Warm Forging

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Warm Forging Process

Although hot forging has been around for centuries, the term warm forging originated sometime around 1950. Although they are different types of forging, they both involve shaping metal by compressive force. Forging parts at elevated temperatures reduces the tonnage necessary to deform the material. The necessity to decrease tonnage may be because of size, material hardness, or complexity of shape. Parts made by warm forging have better tolerances and surface finish than hot forgings, but not as good as cold forgings. Both processes offer a part with increased strength and durability but each method has distinct differences.

Working metal above its re-crystallization temperature (1900-2300F) is called hot forging. Work hardening, also called strain hardening, in metal is caused by dislocation of the metallic crystal structure. Because hot forging takes place above the temperature at which the crystallization occurs, the grains deform to follow the shape of the parts but work hardening does not occur. Therefore, a greater amount of deformation is possible.

Warm forging occurs between room temperature and the re-crystallization temperature of the material (800-1800F). Although this allows work hardening to occur, the degree at which it happens is decreased. In addition, the materials yield strength is reduced and ductility increased, allowing for a greater amount of deformation to take place. Working the metal at a lower temperature than hot forging is beneficial to tooling life as well as part tolerances and surface finishes.

History of Forging Forging dates back to the days when prehistoric people learned to heat sponge iron and beat it with a stone to form a useful implement. It is the oldest known metal working process from which the ancient art practiced by the armor makers and the immortalized village blacksmith developed into the Modern forging we know today. As new metals were discovered so were the methods needed to....more

Materials For Forging Almost any metal can be forged depending on the alloy or grade. Forging at higher temperatures is usually done on grades of material that (A) have the ability to be hardened through other methods, and (B) have a ductility too low to form the desired shape at room temperature without cracking.....more

Methods Of Warm Forming Forgings are generally produced by a hammer or a press. Hammers can have a driving force of up to 50,000 pounds and forging is carried out in a succession of die impressions using repeated blows. The quality of the forging, and the productivity of the hammer depend greatly upon the skill of the operator. Presses can have a driving force of up to 50,000 tons and the forging stock is usually....more

Advantages Of Warm Forging Shaping metal by compressive forces is known as forging. Although there are different types of forging, they all offer a part with increased strength and durability. Its ability to save both time and material are just a few reason to consider forging as an alternative to other methods of ..more

Industrial Application of Warm Forgings Hot forging and warm forging as a method for producing parts from a wide variety of metals, has been used throughout history. It is one of the oldest methods of forming and is still one of the most commonly used to produce parts today. They can be found in various applications including bolts, crack shafts, connecting rods, pistons, sockets, suspension & steering, hubs, trunions and yokes.....more

Our Forging Capabilities The parts we form generally range from 1oz to 10 lbs, with a maximum part length of 12 inches. We do form parts outside of these parameters when the type and location of deformation needed permits it. We have hydraulic and mechanical presses ranging from 8 to 1200 Tons....more

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