Preparation method of gh4169 alloy large-scale special-shaped cross-section ring billet

Abstract

The invention discloses a method for preparing a GH4169 alloy large-scale special-shaped cross-section ring blank. The steps are: heating the GH4169 alloy bar to 1100±10°C in a certain heating method, and then forming a rectangular shape through upsetting, punching and rolling. Cross-section ring billet; then expand it into a ring billet with a special-shaped cross-section with a pressure of 34-36MN; then expand it into a secondary ring billet with a special-shaped cross-section with a pressure of 32-35MN; The upper end of the secondary special-shaped cross-section ring blank is freely upset until it is flush with the tire mold, and the final special-shaped cross-section ring blank is obtained. The method can effectively reduce the forming pressure required for billet making, and at the same time can effectively control the flow direction of the remaining material in the process to ensure the forming size of the intermediate billet. The method is suitable for the preparation of intermediate blanks of large rings with special-shaped cross-sections.

Description

technical field [0001] The invention relates to a blank-making method for a ring forging, in particular to a method for preparing a GH4169 alloy large-scale special-shaped cross-section ring blank. Background technique [0002] The ring rolling technology of ring forgings is an advanced forging technology, which is becoming more and more mature, and the size of ring forgings is getting bigger and bigger, and the shape is becoming more and more complex. In order to obtain a ring forging with qualified shape and size and excellent performance, the key is to make a reasonable intermediate blank. [0003] The Chinese invention patent specification CN101020284A (application number: 200710077667.1) published on August 22, 2007 discloses a method for making a high-temperature alloy large-scale special-shaped cross-section ring blank. The blank-making process adopted in this patent is: upsetting and punching on a forging press , rolled into a rectangular ring blank on a ring rollin...

AI Technical Summary

Problems solved by technology

This process is used to make blanks. After the mold is closed, the inner cavity of the mold is completely closed. When producing large, heavy and difficult-to-deform rings, such as low-pressure turbine case ring forgings with special-shaped cross-sections made of GH4169 alloy, the ring forgings in the mold is closed. The maximum instantaneous pressure has reached over 100MN (equivalent to a pressure of 10,000 tons), but there are very few domestic manufacturers with tens of thousands of tons of forging equipment, most of which are unable to produce such large and heavy special-shaped ring forgings

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