Method for manufacturing GH4169 low pressure turbine box forging with flange

Abstract

The invention belongs to the technical field of forgings preparation, and particularly relates to a method for manufacturing a GH4169 low pressure turbine box forging with a flange. The method that part of a blank film is divided and broken into shape is adopted for manufacturing the GH4169 low pressure turbine box forging with the flange. The method comprises the following steps of sawing, preheating, upsetting, punching, reaming of a mandrel supporter, dividing and breaking forming the part of the blank film, and breaking forming. The GH4169 low pressure turbine box forging with the flange manufactured by the method has the advantages that the outer dimensions meet the manufacturing requirements of parts, and the forming is easy; the machining removal process has a smaller margin, the integrity of the forging flow line is maintained, and the subsequent manufacturing is in short cycle, so that the material utilization rate is high; the internal structure is uniform without need of welding, so that the structural differences and deformation problems caused by welding are solved; the tensile properties at room temperature and 650 DEG C is high and the long-lasting performance is great at 650 DEG C and 690 MPa, so that the technical requirements of aeroengine low-pressure turbines are met, and the margin is large.

Description

technical field [0001] The invention belongs to the technical field of forging preparation, in particular to a method for manufacturing a flanged GH4169 low-pressure turbine case forging Background technique [0002] GH4169 alloy is a precipitation-strengthened nickel-based superalloy with good high-temperature mechanical properties, good thermal process and welding performance, and can manufacture various parts with complex shapes. It is widely used in energy, aviation, petroleum, and nuclear industries. It has become an irreplaceable key material for the hot end parts of aviation gas turbine engines. [0003] The low-pressure turbine casing of an aero-engine is a typical large cone-shaped part and a large-height special-shaped ring part. The shape of the forging part is as follows figure 1 As shown, the cross-sectional area of ​​the large and small heads has a large difference, so it is difficult to directly roll the rectangular cross-section annular intermediate billet i...

AI Technical Summary

Problems solved by technology

At present, the production method of this type of forging is segmental manufacturing + welding or directly breaking and rolling after making a cylindrical billet; this production method has the following disadvantages: 1. Parts obtained by segmental manufacturing and welding, the There are differences in the structure of the material at the weld and other parts of the part, resulting in a decline in the performance of the part; 2. There are differences in the structure and performance of several forgings manufactured in sections, which affects the overall performance of the part

3. There is welding stress after welding, and large deformation will occur due to stress release during subsequent processing and use

4. The diameter of the cylindrical billet is broken and then rolled. A large amount of material needs to be removed, resulting in material waste, and the processing cycle is long and economical.

In addition, the deformation temperature range of GH4169 alloy is narrow, the plasticity is worse than that of ordinary alloys, and the degree of alloying is high. It is difficult to form when it is used to manufacture forgings, and the structure and properties of forgings are very sensitive to forging process parameters, which is not easy to control during processing.

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