A segmental rolling method for large superalloy high cylindrical forgings

Abstract

The invention relates to a segmentally rolling method for a large-scale high-temperature alloy high-cylindrical forging piece. The segmentally rolling method for the large-scale high-temperature alloyhigh-cylindrical forging piece comprises the steps of after heating, forging, chambering a blank and pulling a central spindle, firstly adopting a segmental irregular mold for segmentally and locallyrolling the annular blank, and then adopting a direct-wall mold for integrally rolling the segmentally and locally rolled annular piece, wherein the segmental irregular mold comprises an irregular main roller and an irregular core roller, the roller surfaces of the irregular main roller and the irregular core roller locally contact a wall surface of the annular blank, the direct-wall mold comprises a direct-wall main roller and a direct-wall core roller, the roller surfaces of the direct-wall main roller and the direct-wall core roller partially contact the blank during the rolling process and integrally contact the blank after rolling; and coating a heat-insulation coating on the roller part of the segmentally rolled annular piece, so that the integral mechanical property of the annularpiece during a follow-up rolling process is ensured. Through the method, the utilization ratio of the material and the mechanical property and the quality of the material can be improved, and meanwhile, the requirement for the rolling force of the equipment is lowered.

Description

technical field [0001] The invention relates to the technical field of alloy forging, in particular to a segmental rolling method for a large high-temperature alloy high-tube forging. Background technique [0002] With the rapid development of aerospace industry, modern national defense industry and transportation industry at home and abroad, the demand for large superalloy forgings for aerospace is becoming more and more vigorous, and the development of product types tends to develop in the direction of large diameter and long height, but for For large-diameter, long-height cylindrical parts, due to the high deformation resistance of high-temperature alloys, the current conventional production equipment cannot meet their forging needs, so the forging of large-height forgings can only be realized by segmented welding methods, such as 1000mm The manufacture of high-temperature alloy ring forgings requires separate forging of 3-4 sections of 200-300mm high-temperature alloy ri...

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Problems solved by technology

[0002] With the rapid development of aerospace industry, modern national defense industry and transportation industry at home and abroad, the demand for large superalloy forgings for aerospace is becoming more and more vigorous, and the development of product types tends to develop in the direction of large diameter and long height, but for For large-diameter, long-height cylindrical parts, due to the high deformation resistance of high-temperature alloys, the current conventional production equipment cannot meet their forging needs, so the forging of large-height forgings can only be realized by segmented welding methods, such as 1000mm The manufacture of high-temperature alloy ring forgings requires separate forging of 3-4 sections of 200-300mm high-temperature alloy ring forgings, and then welds each part of the forgings into a whole to achieve the height required by the design, but the welding process On the one hand, it reduces the utilization rate of the material, on the other hand, it also reduces the strength and elongation of the material at the welding point, resulting in the mechanical properties of the forging being unable to reach the mechanical properties achieved by the overall forming, resulting in a great impact on the quality of the product. In order to avoid the decline in the mechanical properties of forgings caused by segmental welding, if large-scale ring rolling equipment is invested, the cost will be too high and the production economy cannot be guaranteed. Therefore, it is not possible to use existing equipment to achieve Segmented Forming Technology of Large Superalloy High Cylindrical Ring Forgings

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