CN-121988982-A - Manufacturing method of large-thickness complex-curvature aluminum alloy pressing plate part for bearing windshield

CN121988982ACN 121988982 ACN121988982 ACN 121988982ACN-121988982-A

Abstract

The application relates to a manufacturing method of a large-thickness complex-curvature aluminum alloy pressing plate part for a bearing windshield in the technical field of aviation manufacturing, which comprises the steps of firstly designing and preparing a stretch-forming die according to a three-dimensional digital model of the aluminum alloy pressing plate part, wherein the aluminum alloy pressing plate part is provided with a concave surface and a convex surface, and the stretch-forming die is provided with a working molded surface designed according to the concave surface; the method comprises the steps of designing and preparing a blank according to three-dimensional digital models and materials of aluminum alloy pressing plate parts, adjusting the posture of the blank according to working conditions, stretching and forming the blank according to the mechanical properties of the blank and forming targets, and milling the profile, making holes, polishing and comparing the stretched and formed blank to obtain the aluminum alloy pressing plate parts. The manufacturing method of the large-thickness complex-curvature aluminum alloy pressing plate part can realize low-cost, high-efficiency and high-precision manufacturing of the large-thickness complex-curvature aluminum alloy pressing plate part for the bearing windshield.

Inventors

WANG RUOQI
YAN YUE
XU FEIFEI
LI JIANHUA

Assignees

北京航空材料研究院股份有限公司
中国航发北京航空材料研究院
江苏春兰机械制造有限公司

Dates

Publication Date: 20260508
Application Date: 20251219

Claims (9)

1. A method of manufacturing a large thickness complex curvature aluminum alloy platen part for a load-bearing windshield comprising: Firstly, designing and preparing a stretch-forming die according to a three-dimensional digital model of an aluminum alloy pressing plate part, wherein the aluminum alloy pressing plate part is provided with a concave surface and a convex surface, and the stretch-forming die is provided with a working molded surface designed according to the concave surface; then, mounting a drawing die on a workbench of drawing equipment, aligning the blank with the drawing die, respectively clamping two ends of the blank into two jaws of the drawing equipment, and adjusting the posture of the blank according to the working type; Then, stretching and forming the blank according to the material mechanical property and the forming target of the blank; And then milling the profile, making holes, polishing and comparing the stretched blank to obtain the aluminum alloy pressing plate part.
2. The method of manufacturing according to claim 1, characterized in that the blank has thickened and/or widened extension regions at each end, which transition from the central region of the blank to an arc.
3. The method of manufacturing according to claim 2, wherein the preparation of the blank comprises the steps of: according to the appearance structure of the designed blank, a numerical control machine tool is adopted to thin or mill the appearance of the original plate material, the processing of the blank design thickness, contour and arc transition area is completed, and then the blank is polished.
4. The manufacturing method according to claim 1, wherein the length and the width of the working profile are respectively larger than those of the aluminum alloy pressing plate part, the working profile is obtained by extending a concave surface by using three-dimensional design software with a concave surface bus as a reference, and the concave surface extending portion and the concave surface meet a tangent relation.
5. The method of manufacturing according to claim 4, wherein the edges of the working profile that contact the blank are formed with transition fillets.
6. The method of manufacturing according to claim 1, wherein the working profile is trimmed based on the results of actual stretch forming of the blank.
7. The method of manufacturing according to claim 1, wherein stretch forming the blank according to the material mechanical properties of the blank and the forming target comprises: before drawing, calculating the tensile force required for reaching the yield point according to the mechanical property test data of the blank material: F=σ·S wherein sigma is yield strength, S is the cross-sectional area of the blank along the width direction; and setting the stretching speed and the target stretching rate, and carrying out stretch forming operation, wherein the mark of the stretch forming completion is that the target stretching force is reached and the extension reaches the requirement.
8. The method of claim 7, wherein the blank material is 2024-T351 aluminum alloy, the drawing speed is 0.02mm/s to 0.1mm/s, and the target drawing rate is 2.5%.
9. The manufacturing method according to claim 1, wherein the drawing equipment is provided with a drill jig, after the blank is drawn and formed, the height of the workbench is firstly lowered, then a positioning hole is drilled at a set position of the drawn blank by the drill jig, then the blank is positioned and fixed on the milling tool by the positioning hole, and then the profile of the blank is milled and the hole is formed.

Description

Manufacturing method of large-thickness complex-curvature aluminum alloy pressing plate part for bearing windshield Technical Field The application relates to the technical field of aviation manufacturing, in particular to a manufacturing method of a large-thickness complex-curvature aluminum alloy pressing plate part for a bearing windshield. Background The bearing type windshield is an important structural part of a cockpit of a large passenger plane, an aluminum alloy pressing plate part of the bearing type windshield is manufactured by adopting a block-shaped blank integral machining mode at present, the machining time of a single aluminum alloy pressing plate part is as long as 1 month, the processing time is very long, the material utilization rate is extremely low, the cost is high, the stress deformation caused by machining is not negligible, the final dimensional accuracy of the part is influenced, and in addition, under the condition that 2024-T351 high-strength aluminum alloy materials are adopted, the low cost and high-efficiency finish machining difficulty is extremely high. Disclosure of Invention In view of the problems existing in the background art, the application provides a manufacturing method of a large-thickness complex-curvature aluminum alloy pressing plate part for a bearing type windshield, which can realize low-cost, high-efficiency and high-precision manufacturing of the large-thickness complex-curvature aluminum alloy pressing plate part for the bearing type windshield. According to one aspect of the invention, a manufacturing method of a large-thickness complex-curvature aluminum alloy pressing plate part for a bearing windshield is provided, and the manufacturing method comprises the steps of firstly designing and preparing a stretch-forming die according to a three-dimensional digital model of the aluminum alloy pressing plate part, wherein the aluminum alloy pressing plate part is provided with a concave surface and a convex surface, the stretch-forming die is provided with a working surface designed according to the concave surface, designing and preparing a blank according to the three-dimensional digital model and materials of the aluminum alloy pressing plate part, then installing the stretch-forming die on a workbench of a stretch-forming device, aligning the blank with the stretch-forming die, respectively clamping two ends of the blank into two jaws of the stretch-forming device according to the working mode, adjusting the blank according to the material mechanical property and the forming target of the blank, and then carrying out stretch-forming, hole forming, polishing and shaping on the stretched blank to obtain the aluminum alloy pressing plate part. In some embodiments of the invention, the blank has thickened and/or widened extension regions at each end, which transition from the central region of the blank to an arc. In some embodiments of the invention, the blank is prepared by adopting a numerical control machine to thin or mill the original plate according to the appearance structure of the designed blank, completing the processing of the blank in the design thickness, outline and arc transition area, and then polishing the blank. In some embodiments of the present invention, In some embodiments of the present invention, the length and width of the working profile are respectively greater than the length and width of the aluminum alloy platen part, and the working profile is obtained by extending the concave surface by using three-dimensional design software with a concave surface bus as a reference, and the concave surface extending portion and the concave surface satisfy a tangent relation. In some embodiments of the invention, the edges of the working profile that contact the blank are formed with transition fillets. In some embodiments of the invention, the working profile is trimmed based on the results of actual stretch forming of the blank. In some embodiments of the invention, stretch forming the blank according to the material mechanical properties of the blank and the forming target comprises calculating a stretching force required to reach a yield point according to the blank material mechanical property test data before stretch forming: F=σ·S wherein sigma is yield strength, S is the cross-sectional area of the blank along the width direction; and setting the stretching speed and the target stretching rate, and carrying out stretch forming operation, wherein the mark of the stretch forming completion is that the target stretching force is reached and the extension reaches the requirement. In some embodiments of the invention, the blank material is 2024-T351 aluminum alloy, the drawing speed is 0.02mm/s to 0.1mm/s, and the target drawing rate is 2.5%. In some embodiments of the present invention, the drawing device is provided with a drill jig, after the blank is drawn and formed, the height of the workbench is firstly lowered, then the drill jig