Machining technology of low-vortex baffles made of aging-hardened nickel-based superalloy Rene'41

Abstract

The present invention relates to a processing technology for a low-vortex baffle of an aging-strengthened nickel-based high-temperature alloy Rene'41. The technical scheme is as follows: comprising the following steps: 1) performing shrinkage margin processing on the size of the drawing die, and performing superposition compensation for the part rebound value and the heat treatment shrinkage value; 2) adding a process edge to the inner edge of the part during process design to enhance the structural strength of the part and reduce the warping degree of the part; 3) the process flow is: blanking - deburring - drawing - solid solution + aging heat treatment - punching the outer circle and hole - punching the inner edge - deburring - cleaning - clamp repair - fluorescent inspection - marking - final inspection; 4) flatness correction is achieved during the solid solution + aging heat treatment of the parts. When loading the furnace, the parts are placed on a graphite plate with a flatness of less than 0.12 mm and stacked in layers; each layer of parts must be flipped and stacked, and the number cannot exceed 2 pieces. The present invention can solve the warping and dimensional shrinkage problems of shallow conical and annular deep-drawn parts of the aging-strengthened nickel-based high-temperature alloy Rene'41.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing, and in particular relates to a processing technology for a low-vortex baffle plate made of an aging-strengthened nickel-based high-temperature alloy Rene'41. Background Art

[0002] The low-vortex baffle of an aircraft engine is a typical shallow conical, annular drawn part, which is formed by die stamping. Its flange diameter is 683.87mm, height is 12.09mm, cone angle is 60°, and the required flatness of the bottom of the disc in the free state is 1.27mm, and the flatness in the restricted state is 0.127mm. Due to the small relative drawing height (H / d), the structural rigidity of the part is low, which is not enough to constrain the residual stress of drawing deformation. In addition, the combined effect of the anisotropy of the sheet metal causes the part to warp. The low-vortex baffle is made of Rene'41 with a wall thickness of 0.81mm, which is an aging-strengthened nickel-based high-temperature alloy. This material has the phenomenon of volume shrinkage after heat treatment. After the parts are subjected to solid solution + aging heat treatment, the structural dimensions change significantly. The design clearly requires that vacuum solid solution aging heat treatment parts are not allowed to be bent, straightened, hammered, twisted, twisted, and other cold processing operations. Therefore, the above two problems must be solved before heat treatment.

[0003] When the material of the baffle is GH536, the processing route is: cutting - deburring - deep drawing - punching the outer circle and hole - punching the inner edge - deburring - cleaning - heat treatment - correction - clamp repair - fluorescent inspection - marking - final inspection; the warping and dimensional changes of the parts can be corrected in the "correction" process after heat treatment. This processing flow obviously cannot meet the design requirements of the low-vortex baffle made of Rene'41. Summary of the invention

[0004] The invention provides a processing technology for processing a low-vortex baffle plate of an aging-strengthened nickel-based high-temperature alloy Rene'41, which can solve the problems of warping and dimensional shrinkage of shallow-conical and annular deep-drawn parts of an aging-strengthened nickel-based high-temperature alloy Rene'41.

[0005] The technical solution of the present invention is as follows:

[0006] The processing technology of aging-hardened nickel-based high-temperature alloy Rene'41 low-vortex baffle includes the following steps:

[0007] 1) Process the shrinkage margin of the drawing die size and perform superposition compensation for the part springback value and heat treatment shrinkage value;

[0008] 2) Add process edges to the inner edge of the part during process design to enhance the structural strength of the part and reduce the degree of warping;

[0009] 3) The process flow is: cutting - deburring - deep drawing - solution + aging heat treatment - punching the outer circle and hole - punching the inner edge - deburring - cleaning - clamp repair - fluorescent inspection - marking - final inspection;

[0010] 4) During the process of solution + aging heat treatment, the flatness of the parts is corrected. When loading the furnace, the parts are placed on a graphite plate with a flatness of less than 0.12mm and stacked in layers; each layer of parts must be flipped and stacked, and the number cannot exceed 2.

[0011] Furthermore, in the age-hardened nickel-based high-temperature alloy Rene'41 low-vortex baffle processing technology, when the part shows unexpected warping and the free state flatness exceeds 1.27mm after solid solution + aging heat treatment, the part must be corrected twice, and the process is as follows: solid solution annealing heat treatment: restore the material plasticity of the part; mechanical correction with a drawing die: restore the preset size of the part; secondary solid solution + aging heat treatment: meet the part performance requirements specified in the design.

[0012] The beneficial effects of the present invention are as follows: the present invention solves the warping and size shrinkage problems of the nickel-based high-temperature alloy Rene'41 low-vortex baffle parts by taking measures such as shrinkage margin processing for the drawing die size, adjusting the process flow, and improving the heat treatment furnace loading method, without the need for cold deformation correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the low vortex baffle structure;

[0014] Figure 2 It is a schematic diagram of a part with a process edge;

[0015] Figure 3 Schematic diagram of the furnace loading status for parts undergoing solution + aging heat treatment. DETAILED DESCRIPTION

[0016] The processing technology of aging-hardened nickel-based high-temperature alloy Rene'41 low-vortex baffle includes the following steps:

[0017] 1) Process the shrinkage margin of the drawing die size and perform superposition compensation for the part springback value and heat treatment shrinkage value;

[0018] 2) If Figure 2 As shown, a process edge 2 is added to the inner edge of the part 1 during process design to enhance the structural strength of the part 1 and reduce the warping degree of the part 1;

[0019] 3) The process flow is: cutting - deburring - deep drawing - solution + aging heat treatment - punching the outer circle and hole - punching the inner edge - deburring - cleaning - clamp repair - fluorescent inspection - marking - final inspection;

[0020] 4) If Figure 3As shown, the flatness correction is achieved during the solid solution + aging heat treatment of the part 1. When loading the furnace, the part 1 is placed on a graphite plate 3 with a flatness less than 0.12 mm. A graphite support 4 is provided between two layers of graphite plates 3 for layered stacking. Each layer of parts 1 must be turned over and stacked, and the number cannot exceed 2.

[0021] 5) When unexpected warping and free-state flatness of Part 1 exceed 1.27 mm after solution + aging heat treatment, Part 1 must be corrected a second time. The process is as follows: solution annealing heat treatment: restore the material plasticity of Part 1; mechanical correction with a drawing die: restore the preset size of Part 1; secondary solution + aging heat treatment: meet the performance requirements of Part 1 specified in the design.

Claims

1. Aging-hardened nickel-based high-temperature alloy Rene'41 low-vortex baffle processing technology, characterized in that: The steps include: 1) Process the shrinkage margin of the drawing die size and perform superposition compensation for the part springback value and heat treatment shrinkage value; 2) Add process edges to the inner edge of the part during process design to enhance the structural strength of the part and reduce the degree of warping; 3) The process flow is: cutting - deburring - deep drawing - solution + aging heat treatment - punching the outer circle and hole - punching the inner edge - deburring - cleaning - clamp repair - fluorescent inspection - marking - final inspection; 4) During the process of solution + aging heat treatment, the flatness of the parts is corrected. When loading the furnace, the parts are placed on a graphite plate with a flatness of less than 0.12mm and stacked in layers; each layer of parts must be flipped and stacked, and the number cannot exceed 2.

2. The aging hardened nickel-based high-temperature alloy Rene'41 low-vortex baffle processing process according to claim 1 is characterized in that: When unexpected warping or free-state flatness exceeds 1.27 mm after solution + aging heat treatment, the part must be corrected a second time. The process is as follows: solution annealing heat treatment: restore the material plasticity of the part; mechanical correction with a drawing die: restore the preset size of the part; secondary solution + aging heat treatment: meet the part performance requirements specified in the design.

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