Rolling forming process for large hollow disc forging

Abstract

The technological process of rolling and forming large hollow disc forging includes the steps of: deforming metal rod material, heating, upsetting to form cake blank, profiling to obtain disc blank, punching hole to obtain hollow disc blank, heating, locating, axial rolling, radial and axial rolling, and measuring size to obtain hollow disc forging. The rolling process has axial rolling force of (2-5)x10<5> kg, radial rolling force of (5-20)x10<4> kg, and broadening speed of 5-15 mm / s. The rolled disc forging has outer diameter of 800-3000 mm, inner diameter of 300-2000 mm and thickness of 30-250 mm. By means of altering the conic size and sizes of the conic roll, disc forgings of different sizes may be rolled. The present invention can form disc forging continuously and form large forging in small apparatus.

Description

technical field [0001] The invention relates to a rolling forming method of forgings, in particular to a rolling forming method of large and medium-sized hollow disc-shaped forgings. Background technique [0002] Large and medium-sized disc-shaped forgings, such as compressor discs and turbine discs for heavy-duty ground gas turbines, are currently mainly used in the world for heavy-duty hydraulic presses for die forging or free forging. Large and medium-sized disc forgings are formed by hydraulic press forging due to the following shortcomings It is difficult to forge and promote the application of disc forgings: [0003] The tonnage required for the equipment is large. For general deformed metal materials such as structural steel, stainless steel and other disc-shaped forgings, 5×10 7 kg (50,000 tons) heavy-duty hydraulic presses can be forged; for disc-shaped forgings of hard-to-deform metal materials such as hard-to-deform high-temperature alloys, even 1×10 8 The heavy...

AI Technical Summary

Problems solved by technology

[0005] When the large disk-shaped forging is formed by forging and pressing, due to the large force-bearing area of ​​the disk-shaped surface, the deformation of the forging is uneven, resulting in uneven structure of the forging, which affects the performance of the forging;

[0006] Using free forging to forge disc-shaped forgings, in general, only a round cake-shaped disc-shaped blank can be forged, and a large amount of machining is required to obtain the required shape of the disc-shaped forging, which not only increases the processing cost, but also wastes a lot of time. metallic material;

[0007] Die forging or free forging is used to forge large and medium-sized disc-shaped forgings. Since the deformation of the disc is realized by forging the entire disc surface, in general, the heating and forging times of the disc are more, and the surface of the disc is oxidized and peeled. More frequent, and the dimensional accuracy of forgings is not high, it is difficult to produce forgings close to the shape of parts, that is, it is difficult to achieve near net shape of forgings;

[0008] Using die forging or free forging to forge large and medium-sized disc-shaped forgings is not easy to realize the automation and flexibility of the forging process, and it cannot meet the market demand for multiple varieties and variable batches;

[0009] Heavy-duty hydraulic presses are used to forge large and medium-sized disc-shaped forgings. The working environment is poor, the labor intensity is high, the productivity is low, and the energy consumption is high;

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