A large thin-wall stiffened plate shape correction method based on sensitive point multi-point incremental forming

Abstract

The invention relates to a large thin-wall stiffened plate shape correction method based on sensitive point multipoint incremental forming, which comprises the following steps of acquiring the deformation deviation on a measuring point, and iteratively solving the measuring point with the maximum contribution degree to the overall shape correction of a wallboard as a sensitive point through a particle swarm optimization by combining with a deformation coordination equation of the wallboard; then, through shape correction amount simulation calculation, obtaining the shape correction amount required for enabling the wall plate mold attaching degree to meet the requirement; and finally, applying a shape correction amount to the sensitive point, and loading, releasing and rebounding to realizethe shape correction effect. According to the present invention, by selecting a measuring point to measure the deformation deviation of the shape correction wallboard; obtaining a sensitive point with the maximum influence on the shape correction effect based on sensitive point analysis; performing simulation calculation to obtain a shape correction amount of the sensitive point; and based on a multi-point incremental forming method, applying the shape correction amount to the sensitive points, the effect of large-scale wallboard shape correction is achieved.

Description

technical field

[0001] The invention relates to a technology in the field of aerospace manufacturing, in particular to a method for correcting the shape of a large thin-walled stiffened plate based on multi-point incremental forming of sensitive points. Background technique

[0002] In the field of aerospace, the current methods of correcting the shape of large thin-walled and reinforced panels are mostly on-site manufacturing workers repeatedly knocking on the deformed part with a hammer based on experience, and gradually correct it to the correct position. This method is effective for thin-walled, low-reinforced, weak-rigid, small-batch, and long-processing-cycle panels. However, for heavy-duty rockets with a diameter of 5 m and later super-heavy rockets with larger diameters, due to the thickness and stiffness of the panels, As the number increases, the required correcting force also increases, and this method of hand-beating the corrected shape based on experience will n...

Examples

Embodiment Construction

[0019] Such as figure 2 As shown, it is a method for correcting the shape of a large thin-walled stiffened plate based on multi-point incremental forming of sensitive points involved in this embodiment, including the following steps:

[0020] Step 1. Measuring point selection and measuring point deviation acquisition, the specific steps include:

[0021] 1.1) In this embodiment, the correction of the wall plate of a certain type of rocket fuel tank in active service is taken as an example. According to the continuity of the deformation of the thin-walled plate, there will not be too much difference in deformation deviation near the wall plate; and because the stamping head and the surface of the wall plate will be deformed to a certain extent during the incremental correction, the actual The contact point on the surface is expanded into a small plane, so the measuring points do not need to be too dense when dividing the measuring points. At the same time, it is necessary to...

technical field

[0001] The invention relates to a technology in the field of aerospace manufacturing, in particular to a method for correcting the shape of a large thin-walled stiffened plate based on multi-point incremental forming of sensitive points. Background technique

[0002] In the field of aerospace, the current methods of correcting the shape of large thin-walled and reinforced panels are mostly on-site manufacturing workers repeatedly knocking on the deformed part with a hammer based on experience, and gradually correct it to the correct position. This method is effective for thin-walled, low-reinforced, weak-rigid, small-batch, and long-processing-cycle panels. However, for heavy-duty rockets with a diameter of 5 m and later super-heavy rockets with larger diameters, due to the thickness and stiffness of the panels, As the number increases, the required correcting force also increases, and this method of hand-beating the corrected shape based on experience will n...

Examples

Embodiment Construction

[0019] Such as figure 2 As shown, it is a method for correcting the shape of a large thin-walled stiffened plate based on multi-point incremental forming of sensitive points involved in this embodiment, including the following steps:

[0020] Step 1. Measuring point selection and measuring point deviation acquisition, the specific steps include:

[0021] 1.1) In this embodiment, the correction of the wall plate of a certain type of rocket fuel tank in active service is taken as an example. According to the continuity of the deformation of the thin-walled plate, there will not be too much difference in deformation deviation near the wall plate; and because the stamping head and the surface of the wall plate will be deformed to a certain extent during the incremental correction, the actual The contact point on the surface is expanded into a small plane, so the measuring points do not need to be too dense when dividing the measuring points. At the same time, it is necessary to...

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