Rolling formation method for large and medium size solid plate-shape forge piece

Abstract

The invention discloses a method for rolling and forming a large and medium-sized solid disk-shaped forging. The rolling process is: deformed metal bar material → heating → upsetting (press machine) → cake blank → pressing (press machine) → solid disk blank →heating→installation positioning (rolling machine)→axial rolling (rolling machine)→size measurement→solid disc forging. The axial rolling force of rolling is 2×105kg~5×105kg, and the widening speed is 5mm / s~15mm / s. The dimensions of the rolled disc forgings are: outer diameter Φ800mm~Φ3000mm, axial thickness 30mm~250mm. And by changing the shape and size of the cone surface of the cone roll, disc-shaped forgings with different disc surfaces and cavities can be rolled. This method can realize the continuous local plastic deformation forming of disc-shaped forgings, and use small equipment to dry large forgings.

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 solid 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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