Rolling forming method of large and medium scale stainless steel solid disk forgings

Abstract

The invention discloses a rolling forming method of large and medium scale stainless steel solid disk forgings. Firstly stainless steel bar stock is upset and profiled to form a solid disk billet, and then the disk billet is loaded into an elongator to be rolled. During 20 s rolling, the disk billet is expanded at the speed of 10 to 15 mm / s under the condition that axial feeding speed is 2 mm / s and axial rolling force is 4000 to 4900 KN; during 20 to 40 s rolling, the disk billet is expanded at a speed of 8 to 12 mm / s under the condition that axial feeding speed is 1 mm / s and axial rolling force is 3000 to 3500 KN; and during 40 to 60 s rolling, the disk billet is expanded at a speed 5 to 8 mm / s under the condition that axial feeding speed is 0.5 mm / s and axial rolling force is 2500 to 3000 KN, and finally the solid disk forgings are rolled on one-grade fire. The method is mainly applied to the disk forgings with excellent rolling shapes, dimensions, tissues and properties.

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 stainless steel solid disc-shaped forgings. Background technique [0002] Large and medium-sized solid disk forgings, such as compressor disks and turbine disks for heavy-duty ground gas turbines, require forgings to have excellent structure and performance due to the harsh working environment and complex stress. [0003] Chinese Invention Patent Specification CN1978125A published on June 13, 2007 discloses a rolling forming method for large and medium-sized solid disc-shaped forgings. After the solid disc is heated, it is installed in the machine for positioning and axially rolled into a solid disc-shaped forging. This method only solves the technical problem of rolling forming of large and medium-sized solid disc-shaped forgings. When this method is used to roll large and medium-sized stainless steel solid disc forgings...

AI Technical Summary

Problems solved by technology

When this method is used to roll large and medium-sized stainless steel solid disc forgings, when the upper tapered roll of the rolling mill moves towards the disc blank in the axial direction to roll the disc blank, if the feed speed is too high, the disc blank will be rolled. When the temperature rises during rolling, it is easy to cause defects such as overheating, overburning, and structural variation; if the feed rate is too small, it will cause the plate to dissipate heat too quickly during rolling, resulting in no rolling, or increasing the rolling time and rolling times, reduce rolling efficiency, and also cause defects such as insufficient filling of the peripheral part of the ring sharp corner near the outer ring surface of the disk forging

And when adopting this method to roll disc-shaped forgings, it is necessary to make the shape and size of disc-shaped forgings reach the requirements through repeated multi-turn rolling, which not only increases production costs, reduces productivity, but also repeatedly rolls for many times. Process and quality control add difficulty

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