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Open Die Forging And Closed Die Forging: Which One Is Best?

What Is Open Die Forging

Open die forging is a procedure of deforming a piece of metal between multiple metal dies, which do not completely enclose the material. Through the movement of the forging die, the metal alloy will gradually change its shape as the forging die is hammered or stamped. Products formed by open forging usually require secondary processing and refining to achieve the tolerances required by the final specifications. Open die forging is widely used for simple rather than complex small quantities of products such as discs, rings, sleeves, cylinders, and shafts. Custom shapes can also be produced by open die forging. Due to the repeated processing of the billet, the strength of the grain structure will increase during the deformation process. Another benefit of open die forging is to improve the fatigue resistance and strength of the product. Besides, open die forging can effectively reduce voids.

Advantages of Open Die Forging
  • Little or no tooling cost
  • Shorten delivery time
  • Usually used for small batch production
Disadvantages of Open Die Forging

Open die forging usually has two main disadvantages. The first is material consumption. Although open die forging is ideal for large parts, this method is limited in tight tolerance applications because it is not suitable for forming more precise details. Another thing to consider for open die forging is that completing these products usually requires more machining.

Open Die Forging Application

The mold opening process is best used for specifications that are generally considered uncomplicated. There are four general types of shapes, of which open die forging is usually the preferred method. These four categories are cylindrical, cabochon or pancake forgings, hollow forgings, and contour forgings. Some part shapes usually fall in the field of open die forging, including discs, stepped shafts, shafting and rods.

What Is Closed Die Forging

Closed die forging (also called die forging) is a metal forming process that compresses a piece of metal under high pressure to fill a closed die. For some special shapes, secondary forging is required to achieve the final shape and size. The type of material, the tightness of tolerances, and the need for heat treatment can determine the cost of closed forging parts.

Advantages of Closed Die Forging
  • Less processing
  • Few material restrictions
  • Better surface finish
  • Cost-effective mass production
  • Mesh parts with small tolerances
Disadvantages of Closed Die Forging

The initial cost of developing closed die forging processes and tools is very high, requiring precision machining of the mold.

Closed Die Forging Application

Closed die forging is commonly used to manufacture metal parts, especially for industrial applications such as agriculture, electronics, aerospace, automotive, commercial, manufacturing, semiconductor, construction, hardware, and food processing.

ACE Machinery is an ISO 9001 certified manufacturer for OEM casting and forging service, including China CNC machiningcustom die castingchina investment castingforging services, etc. Contact us for more custom casting services!

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If you would like to have a question then get in touch today, we are ready to assist 24/7.
We welcome your cooperation and we will develop with you.

 Factory-direct Connectivity Solutions.
 High quality, Competitive Price.
 Custom-tailored solutions.
 Problem-solving approach.