CN-121988989-A - Preparation method of complex curved surface body thin-wall shell of aerospace craft

CN121988989ACN 121988989 ACN121988989 ACN 121988989ACN-121988989-A

Abstract

The invention is suitable for the technical field of processing of curved surfaces of aerospace vehicles, and provides a preparation method of a complex curved surface thin-wall shell of an aerospace vehicle, which comprises the steps of modeling, digital-to-analog decomposition, die manufacturing, plate selection, plate welding, shape processing, heat treatment and compression molding processing to obtain a hollow thin-wall shell; on the other hand can become the plane welding with curved surface welding when the production of complicated curved surface body, not only effectual solution current complicated curved surface body production welding can not realize once welding the problem of many, but also a large amount of save materials in the greatly shortened process cycle, can also realize batch production and improve the yields simultaneously.

Inventors

ZHU ZHIMENG
WU GUOFENG
GAO YOUJIA
HU JUN

Assignees

湖南高创翔宇科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260302

Claims (8)

1. The preparation method of the complex curved surface body thin-wall shell of the aerospace vehicle is characterized by comprising the following steps of: Modeling a model, namely modeling a hollow thin-wall shell of a complex curved surface body by adopting drawing software; Performing digital-analog decomposition, namely performing digital-analog decomposition and unfolding according to the modeled complex curved surface body to obtain two plane model drawings, wherein one plane model drawing is provided with a runner, and the other plane model drawing is provided with no runner; Step three, manufacturing a mould, namely manufacturing a shaping mould of the complex curved surface body according to the model modeled in the step one; Selecting a plate, namely selecting a corresponding first plate and a corresponding second plate according to a plane model drawing, milling the first plate to form a runner, removing burrs cleanly, and machining positioning holes in the first plate and the second plate; step five, welding the plates, namely splicing the two plates in the step four according to the positioning holes, and welding the two plates into a whole through vacuum diffusion welding to obtain a blank; step six, appearance processing, milling the blank material into an appearance according to the plane model drawing of the step two, and using a die to form a positioning waist groove to obtain a curved surface blank; Step seven, heat treatment, namely placing the curved surface blank material into a heating furnace for heat treatment, and controlling the temperature to be 890-910 ℃; And step eight, compression molding, namely placing the curved surface blank subjected to the heat treatment in the step seven into a shaping die in the step two, positioning through a positioning waist groove, profiling by using an oil press, and taking out after cooling to obtain the hollow thin-wall shell part.
2. The method for preparing the complex curved surface body thin-wall shell of the aerospace vehicle according to claim 1, further comprising the step of cleaning the hollow thin-wall shell part in the step eight by adopting an acid cleaning process, removing an oxide layer on the surface of the hollow thin-wall shell part, and drying after exposing the natural color of the stainless steel.
3. The method for manufacturing the complex curved surface body thin-wall shell of the aerospace vehicle according to claim 2, further comprising the step of pumping 40Mpa of water pressure into a runner in the dried hollow thin-wall shell part, and if the hollow thin-wall shell part does not leak or deform, the hollow thin-wall shell part is qualified.
4. The method for manufacturing the complex curved surface body thin-wall shell of the aerospace vehicle according to claim 3, further comprising the steps of carrying out three-dimensional scanning on the workpiece of the complex hollow thin-wall shell by adopting a three-dimensional scanner, comparing the scanned data with model data in the first step, and obtaining a qualified product when the deviation between the size of the scanned workpiece and the digital-analog size is within 0.3 mm.
5. The method for manufacturing the thin-wall shell of the complex curved surface body of the aerospace vehicle according to claim 4, further comprising the steps of putting qualified products into corresponding tools, milling out positioning lugs of the qualified products, and milling out the shape of the complex curved surface body to obtain the hollow thin-wall shell of the aerospace vehicle.
6. The method for manufacturing the complex curved surface body thin-wall shell of the aerospace vehicle according to claim 1, wherein the thickness of the first plate is 3.0mm, the thickness of the second plate is 1.5mm, and the first plate and the second plate are both straight plates.
7. The method for manufacturing a thin-walled shell of a complex curved surface body of an aerospace vehicle according to claim 6, wherein the height of the flow passage milled in the fourth step is 1.5mm.
8. The method for preparing the complex curved surface body thin-wall shell of the aerospace vehicle according to claim 5, wherein zirconia is sprayed on the inner part of the hollow thin-wall shell of the aerospace vehicle.

Description

Preparation method of complex curved surface body thin-wall shell of aerospace craft Technical Field The invention belongs to the technical field of processing of curved surfaces of aerospace vehicles, and particularly relates to a preparation method of a hollow thin-wall shell of a complex curved surface of an aerospace vehicle. Background The space craft is also called space craft or space craft, which is various kinds of craft running in space according to the law of celestial mechanics and executing the specific tasks of exploration, development and utilization of space, celestial body and the like, and can be also called carrier rocket, spacecrafts such as exploring rocket and the like, and aircrafts such as plane and the like. The outer curved surface of the shell of the aerospace vehicle is generally complex, the wall thickness is thin, for example, the prior old shell is of a single-layer structure, and the aerospace exploration of the aerospace vehicle at present cannot be met. With the continuous development of new technologies and processes, a hollow shell structure of an aerospace vehicle has also developed, for example, a currently common thin-wall structure with a wall thickness of generally 4.5mm for the shell of the aerospace vehicle, and a hollow shell body formed by an inner wall thickness of 1.5mm, a runner of 1.5mm and an outer wall thickness of 1.5mm, wherein the hollow shell body cannot be rapidly processed on a traditional numerical control machine by using a forging piece, and although the current three-dimensional printing technology is mature, the density of materials printed by the current three-dimensional printing technology cannot meet the use requirement of the aerospace vehicle due to the fact that the shell of the aerospace vehicle has higher pressure requirement. Therefore, when the curved surface body structure of the aerospace craft is produced and processed, the curved surface body can be primarily processed only under the condition that a numerical control machine tool consumes a huge amount of time. The manufacturing cost and the processing time are very high, and the method is not suitable for mass production, so that the manufacturing progress of the aerospace vehicle is easily limited, and the manufacturing and rapid development of the aerospace vehicle are affected. Disclosure of Invention The invention provides a preparation method of a hollow thin-wall shell of a complex curved surface body of an aerospace vehicle, and aims to solve the problems that the manufacturing cost is high, the processing time is long and the like in the production and processing process of the existing manufacturing technology, and the manufacturing progress and the rapid development of the aerospace vehicle are limited due to the fact that mass production is not suitable. The invention discloses a preparation method of a complex curved surface body thin-wall shell of an aerospace vehicle, which comprises the following steps: Modeling a model, namely modeling a hollow thin-wall shell of a complex curved surface body by adopting drawing software; Performing digital-analog decomposition, namely performing digital-analog decomposition and unfolding according to the modeled complex curved surface body to obtain two plane model drawings, wherein one plane model drawing is provided with a runner, and the other plane model drawing is provided with no runner; Step three, manufacturing a mould, namely manufacturing a shaping mould of the complex curved surface body according to the model modeled in the step one; Selecting a plate, namely selecting a corresponding first plate and a corresponding second plate according to a plane model drawing, milling the first plate to form a runner, removing burrs cleanly, and machining positioning holes in the first plate and the second plate; step five, welding the plates, namely splicing the two plates in the step four according to the positioning holes, and welding the two plates into a whole through vacuum diffusion welding to obtain a blank; step six, appearance processing, milling the blank material into an appearance according to the plane model drawing of the step two, and using a die to form a positioning waist groove to obtain a curved surface blank; Step seven, heat treatment, namely placing the curved surface blank material into a heating furnace for heat treatment, and controlling the temperature to be 890-910 ℃; And step eight, compression molding, namely placing the curved surface blank subjected to the heat treatment in the step seven into a shaping die in the step two, positioning through a positioning waist groove, profiling by using an oil press, and taking out after cooling to obtain the hollow thin-wall shell part. And further, the method comprises the step of cleaning the hollow thin-wall shell part in the step eight by adopting an acid cleaning process, removing an oxide layer on the surface of the hollow thin-wall shell part, and drying