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Closed Die Forging


Closed die forging, one of the main forging process, involves the pressing or hammering of preformed metal blanks into a set of dies shaped as a three dimensional negative of the part to be produced. In closed die forging, the hammer and anvil fully enclose the workpiece, forcing the metal to fill all areas of the dies. Closed die forging can produce a nearly limitless variety of 3-D shapes, and is capable of producing complex parts with tight tolerances.


closed die forging processClosed die forging is operated under two tooling dies: a stationary die (anvil) and a moving die (hammer). Both dies contain an impression of the desired part shape. The moving die presses down onto the stationary die and the metal workpiece and causes the metal to flow into every part of the die and take its shape. A small amount of excess metal flows into a thin recess at the edges of the two dies called a flash gutter;  the flash cools quickly and then serves as a plug keeping the rest of the metal in the die. Often, closed die forging requires that the workpiece be moved through a series of impression cavities, at first forming the rough shape, then proceeding until a finisher cavity turns out the final product. The closed die forging process can be done with cold forging, hot forging or warm forging. In cold forging the metal is not directly heated, but formed using high pressure. In hot forging the metal is heated to high temperatures then formed. In warm forging the metal is heated to a range that is typically above room temperature, but below the re-crystallization temperature of the metal. Closed die forging is the most common method of forging utilized in the industry to produce intricate and difficult geometries, offering countless possibilities for creating high strength components and tools with precision.

Why Closed Die Forging?

Closed die forging is distinct from open die forging, in which the die only comes into contact with part of the workpiece at a time. Initial costs for developing the processes and tooling for closed die forging can be quite high, but it is the most cost-effective forging method for high volume production, since recurring costs for each part are very low. In addition, closed die forging is capable of producing both symmetrical and non-symmetrical parts. Materials that frequently undergo closed die forging processes include high alloy steel, naval brass, carbon steel, aluminum, alloy metals, stainless steel, copper, nickel, tool steel and titanium. Closed die forgings are used particularly often by industries such as agricultural, electronics, aerospace, automotive, commercial, manufacturing, semiconductor, construction, hardware and food processing. Of course, there are also lots of other closed die forging advantages......

Top Closed Die Forging Supplier

Fly Forge is the top closed die forging supplier and exporter in China. With forging facilities ranging from 300t-2500t, we are capable to produce closed die forged components from 0.2kg-60kg. There is no material limitation if you would like to source steel forgings or aluminum forgings. We can supply all the metal forgings you like. In addtion, with in-house tool & die shop, precision machining shop and heat treatment shop, we have the capabilities to offer full forging services including machining and heat treatment. These capabilities will also help us to produce high quality products with competitive prices.

Quality Assurance

To ensure qualified product, all our closed die castings much pass strick quality control in each processing step. Inspection job exsits in each procedure.

Raw material: Before material is stocked, we will first do chemical analysis to compare the composition in allowed range.
Blank inspection: During closed die forging process, once forging blank is first produced, our quality inspector will first test the dimensions of products. Only the dimensions are all good, can we go head for further processing. Here is a video shown how our testing on forging blanks.
Machining: If machining is required after forging, we will also inspect the machining dimensions.

If you are interested in using metal parts made from closed die forging, we can provide them for you! Here at Fly Forge, we are the specialist. We have the ability to provide custom forgings that meet your specific applications. Our quality metal forgings have helped us become a major supplier of closed die forgings to a global customer base. Contact us for your next closed die forging project or know about our closed die forging capabilities today! One of our team will go back to you once receiving your email.

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