Classification, Advantages, And Typical Forgings of Close Die Forging

During the production of open-die forging, flash will be generated around the forging, which increases material consumption, reduces material utilization, increases costs, and increases forging force. Therefore, close die forging without flash and small flash trim forging have become people's pursuit. Closed-die forging has also become a development trend in the future.

Classification of Close Die Forging

Close die forging can be classified according to forging accuracy and mold parting surface.

Classification by forging accuracy

It can be divided into general close die forging and precision close die forging. The machining allowance and tolerance of general close die forging are still the same as those of open-die forging, and the purpose is to improve the material utilization of forgings.

Precision close die forging not only has no flash, but also has a small machining allowance and tolerance, and can be finished without rough machining. It belongs to precision forging.

Classification by mold parting surface

It can be divided into overall concave mold and separable concave mold close die forging. Separable concave mold close die forging is also called closed mold forging, which is abbreviated as multi-directional forging for closed mold forging with three or more movable punches. Overall concave mold close die forging is used for simple-shaped forgings, and separable concave mold close die forging is used for complex-shaped forgings.

Advantages of Close Die Forging

Improve material utilization

General material utilization can be increased by 10% to 30% according to the shape of the forging. The material utilization of small inner hole gear hot close die forging can reach 95%.

Improve forging accuracy

For example, the machining allowance of automobile gearbox gear hot close die forging is only 0.6-0.8mm, and the rough machining process is omitted, which belongs to refined blank.

Save production processes

Since there is no flash, the trimming process is reduced.

Reduce energy consumption

Energy consumption can be reduced by 10% to 50%.

Improve mechanical properties

The typical close die forging parts include:

1) Overall concave mold close die forging

Rotating parts such as gear blanks, bearing rings, flanges, etc.

2) Separable concave mold close die forging

Complex and precision forgings with radial sprouts (projections), such as straight bevel gears, homokinetic joints with star-shaped sleeves, tripod shafts, magnetic poles, cross shafts, three-way valve bodies, and turbine engine discs.

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