Manhole Forging is usually divided into free forging and die forging. Free forging usually uses simple tools to forge manhole ingots or blocks when forging hammers or hydraulic presses. Because no special die is used in free forging, the dimensional accuracy of forging is low and the productivity is not high. It is mainly used for single product, small batch production, large forging production or billet opening in manhole factory. Die forging is formed by using die forging hammer or hot die forging die, which can be divided into open die forging and closed die forging.

Because the metal forming is controlled by the die, the die forging has very accurate shape and size, and the manhole has high productivity, which is suitable for mass production. Two times extrusion is mainly used to produce extrusion parts.

Extrusion is a forming process under the condition of strong three-dimensional compression stress, so it has great deformation ability and is more suitable for forming low plastic materials. Extrusion at room temperature is called cold extrusion. High efficiency and high quality extrusion process. Cold extrusion of small and medium-sized parts is more and more popular.

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