技術紹介

Benefits of cold forging

Forging is highly efficient in production, it is possible to obtain strength and toughness in products.
It can also contribute to shorten machining time by reducing material thickness which leads to material saving.

One of the processing methods using plastic deformation

When a certain amount of force is applied to an object, the object deforms. Deformation remains even if the applied force is removed.
Such deformation is called permanent deformation, deformation that leaves permanent change is called "plastic deformation", and the processing method that utilizes this plastic deformation is called "plastic working".

Metal flow

What is cold forging?

It is a construction method in which plastic working is performed at "room temperature", is possible to produce products with higher accuracy than other methods such as hot forging.

①Less material loss

  • ・Can be manufactured with the minimum volume of materials.
    (less material loss during machining)
  • ・A method with high material utilization and efficiency.
Example: By changing the production method from all machining, which is said to have a large cutting allowance, it is possible to reduce material costs significantly.
工法:総切削(丸棒→切削)/工法:鍛造→切削

②Connects to resource saving

  • ・Unlike other production methods, forging is performed using plastic deformation. The thickness can be reduced while ensuring the same strength, leading to resource saving and cost reduction.
押出し丸棒と鍛造の強度比較

③Optimal precision machining

  • ・The features of forging in room temperature without applying heat on metal are: Since dimensional variation does not occur due to thermal expansion, dimensional accuracy is excellent, and surface roughness is also very good (clean surface finishing).
  • ・Depending on the shape, forging in units of 10 µm is possible.
  • ・It is also excellent in net shape, machining may not be necessary depending on the shape.
アルミピストン

④Increases strength

The micro structure that makes up the metal is crushed and stretched during forging, forming a forging streamline (metal flow line) that follows the shape of the product and increasing toughness.
This “continuous forging line” is a unique feature of forging which cannot be obtained by other methods like casting and whole machining.

Metal flow

Comparison with other methods

Hot forging Cold forging Die-casting
Characteristics
  • ・Advantageous for complex shapes
  • ・Mass processing is possible
  • ・Less material loss
  • ・Metal flow is obtained and strength is increased
  • ・The crystal structure is dense and there are no internal defects
  • ・Freedom in shape and size
  • ・Applicable for all dissolvable metals
  • ・Casting cavity occurs
Molding temperature Recrystallization temperature:
For A6061,410ºC or higher
Room temperature (Molding temperature)670ºto 760ºC
Deformation resistance Low High Low
Dimensional accuracy
Surface finish
Complex shape modeling
Production quantity Small・medium production. Medium and mass production Mass production
Yield One at a time One at a time Many
Material cost

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