What is the process of forging?

2022-06-08

The forging plant needs a forging program or process before forging, and then adopts such process to forge the required forgings during forging processing. Its specific preparation includes raw material selection, calculation, blanking, heating, calculation of deformation force, equipment selection, mold design. In addition, good lubrication method and lubricant should be selected before forging.
Forging materials cover a wide range of both a variety of brands of steel and high temperature alloy, and aluminum, magnesium, titanium, copper and other non-ferrous metals. As we all know, the quality of products is often closely related to the quality of raw materials, so for forging workers, it is necessary to have the necessary material knowledge, to be good at selecting the most appropriate material according to the process requirements. Then we come to understand the forging plant forging process as follows.
Calculating and blanking is one of the important links to improve the material utilization rate and realize the finishing of blank. Too much material not only causes waste, but also aggravates die wear and energy consumption. If the blanking does not leave a little margin, it will increase the difficulty of process adjustment and increase the rejection rate. In addition, the quality of cutting end face also has an impact on the process and forging quality.
The purpose of heating is to reduce forging deformation force and improve metal plasticity. But heating also brings a series of problems, such as oxidation, decarbonization, overheating and burning. Accurate control of initial and final forging temperature has great influence on product structure and properties.
Flame furnace heating has the advantages of low cost, strong applicability, but the heating time is long, easy to produce oxidation and decarbonization, working conditions also need to constantly improve. Electroinduction heating has the advantages of rapid heating and less oxidation, but it has poor adaptability to product shape, size and material change.
Forging is produced under the action of external force, so the correct calculation of deformation force is the basis for selecting equipment and checking die. The stress and strain analysis of the deformed body is also necessary to optimize the process and control the microstructure and properties of forgings.
The analysis methods of deformation force are as follows: although the principal stress method is not very strict, it is relatively simple and intuitive, which can calculate the total pressure and the stress distribution on the contact surface between the workpiece and the tool. The slip line method is strict to plane strain problem, and it is more intuitive to solve stress distribution for local deformation of forging parts, but its application scope is narrow. The upper bound method can give the overestimated load and the upper bound element can also predict the shape change of the workpiece during deformation. The finite element method can not only give the external load and the change of the workpiece shape, but also give the internal stress and strain distribution. The disadvantage is that the computer needs more time, especially when solving according to the elastic-plastic finite element method, the computer needs larger capacity and longer time. Recently there has been a tendency to adopt a combined approach to the analysis of problems, for example, the upper bound method for rough calculations and the finite element method for fine calculations at critical points.
Reduce friction, not only can save energy, but also can improve the life of the mold. Because the deformation is relatively uniform, it is helpful to improve the microstructure and properties of forging products, and one of the important measures to reduce friction is to use lubrication. Because of the difference of forging way and working temperature, the lubricant used is also different. Glass lubricants are used in high temperature alloy and titanium alloy forging. For hot forging of steel, water-based graphite is a widely used lubricant. For cold forging, due to high pressure, the forging also needs phosphate or oxalate treatment.

The process that the forging plant needs to use in the process of forging is like this. In accordance with this process, the quality of forging is more guaranteed.


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