Forging Features

2022-03-01

forging process

Different forging methods have different processes. Among them, the process of hot die forging is the longest, and the general order is: blanking of forging billet; heating of forging billet; roll forging preparation billet; die forging forming; trimming; punching; straightening; Intermediate inspection to check the size and surface defects of forgings; heat treatment of forgings to eliminate forging stress and improve metal cutting performance; cleaning, mainly to remove surface oxide scale; correction; inspection, general forgings are subject to appearance and hardness inspections, important forgings also It must undergo chemical composition analysis, mechanical properties, residual stress and other inspections and non-destructive testing.

Forging Features

Compared with castings, the metal structure and mechanical properties can be improved after forging. After the casting structure is deformed by the forging method, due to the deformation and recrystallization of the metal, the original coarse dendrites and columnar grains become an equiaxed recrystallized structure with finer grains and uniform size, which makes the original segregation and recrystallization in the steel ingot. Porosity, pores, slag inclusions, etc. are compacted and welded, and the organization becomes more compact, which improves the plasticity and mechanical properties of the metal. The mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging is consistent with the shape of the forging, and the metal streamline is complete, which can ensure the parts have good mechanical properties and long service life. Precision die forging and cold extrusion are used. Forgings produced by processes such as warm extrusion and warm extrusion are incomparable to castings. Forgings are objects that are subjected to pressure on metal and shape the required shape or suitable compressive force through plastic deformation. This force is typically achieved through the use of a hammer or pressure. The forging process builds a refined grain structure and improves the physical properties of the metal. In real-world use of the component, a proper design enables particle flow in the direction of the main pressure. Castings are metal forming objects obtained by various casting methods, that is, the smelted liquid metal is injected into the pre-prepared casting mold by pouring, injection, suction or other casting methods, and after cooling, it is subjected to falling sand, cleaning and post-processing. Processing, etc., the resulting objects of certain shape, size and properties.