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Technological characteristics of large shaft forgings

Release time:

2022-04-08

1. Function and structural characteristics of large shaft forging parts

Shaft large forging parts are a relatively common part in all mechanical products. The function of this part is to support the transmission parts and transmit torque. The shaft is a rotating body part. Its composition is composed of outer conical surface, inner and outer cylindrical surface of thread, inner, spline and transverse hole, etc. The parts can be divided into optical shaft, hollow shaft, cross shaft, eccentric shaft, crankshaft and camshaft half according to their structure. Shafts, stepped shafts, flower chain shafts, etc.

2. Accuracy requirements for large shaft forging parts

Large-scale shaft forgings have high requirements for precision during processing, and defects cannot exist. Shaft parts manufactured by forging processing technology have a high ratio of weight and strength, and high strength can be very good. Guaranteed shaft parts resist long-term friction during long-term use

(1) Dimensional accuracy and geometric shape accuracy

The journal of the shaft is an important surface of the shaft parts, and its quality directly affects the rotation accuracy of the shaft when it is working. The diameter accuracy of the journal is usually 1T6 according to the requirements of use, and sometimes it can reach 1T5. The geometrical accuracy of the journal should be limited within the diameter tolerance.

(2) Position accuracy

The coaxiality of the mating journal (the journal for assembling the transmission parts) relative to the supporting journal (the journal for assembling the bearing) and the perpendicularity between the journal and the supporting end face are usually required to be higher.

(3) Surface roughness

Each machined surface of shaft parts has surface roughness requirements. In general, the surface roughness value of the bearing journal is required to be small. It is Rα0.63~0.16, and the surface roughness value of the matching journal is Rα2.5~0.63.

3. Exquisite appearance

People often have a good impression of beauty, therefore, sufficient quality and beautiful appearance are often very familiar and welcome large shaft forgings. This requires the shaft parts to have the characteristics of exquisite appearance. In the processing link, the surface should also be treated, on the one hand, for the use of performance, on the other hand, to improve the aesthetics.

4. Good physical properties

Large shaft forgings are made by applying a certain pressure and then plastically deformed. During the forging process, a very delicate particle structure is built, so the physical properties of the shaft parts have been greatly improved. It has excellent physical properties in practical applications.

During the forging process of large shaft forgings, attention should be paid to: in the ordinary flat anvil drawing process of the traditional forging process theory, there are often longitudinal cracks or axial dense defects in the middle area of the roll body. The forging processing technology also needs to be improved, and the forging permeability of the flat anvil drawing process needs to be improved. At the same time, professional forging technicians and inspectors are also factors that affect the quality of forgings.