CN-122008586-A - Integrated forming control method for composite material force bearing barrel with inconsistent thickness

Abstract

The invention discloses an integrated forming control method of a composite material bearing cylinder with inconsistent thickness, which comprises the steps of dividing a cylinder body paving region and a flange reinforcing paving region according to structural characteristics, setting target thickness, carrying out basic paving on a forming supporting structure to form a main body preformed layer, carrying out progressive local reinforcing paving on the flange reinforcing paving region, carrying out integral closing paving to form a continuous integrated paving structure, setting a sectional pressure equalizing structure on the outer surface of a manufactured part, reserving expansion compensation gaps, and completing pressurizing and curing in the same curing period. Compared with the prior art, the invention improves the forming consistency and the qualification rate through the zoning progressive layering and the compression coordination, and is suitable for the rocket cabin composite material force-bearing cylinder.

Inventors

• WANG PENG
• LI YI

Assignees

• 安徽梦克斯航空科技有限公司

Dates

Publication Date

20260512

Application Date

20260413

Claims (10)

1. 1. The integrated forming control method of the composite material force bearing barrel with inconsistent thickness is characterized by comprising the following steps: a) Dividing a workpiece into a barrel body paving region and a flange reinforcing paving region along the axial direction according to the structural characteristics of the bearing barrel, and respectively setting target thickness, wherein the target thickness of the flange reinforcing paving region is larger than that of the barrel body paving region; b) Firstly, performing basic layering on a barrel body layering area on a forming supporting structure to form a body preformed layer with initial bearing capacity; c) After the main body preformed layer is formed, carrying out progressive local reinforcement layering only in a flange reinforcement layering area, and gradually constructing a flange structure with the thickness larger than that of the main body of the cylinder; d) After the flange reinforcing layering is completed, integrally closing the layering area of the main body of the cylinder and the flange reinforcing layering area to form a continuous integrated layering structure; e) Arranging sectional pressure equalizing structures on the outer surface of a finished product after layering, and reserving expansion compensation gaps between adjacent pressure equalizing structures to coordinate the pressure-bearing state of areas with different thickness in the pressurizing and curing process; f) And placing the finished piece with the layering and pressure equalizing structure in a pressurizing and curing environment, and completing pressurizing and curing in the same curing period to realize the integrated molding of the composite material bearing barrel with inconsistent thickness.
2. 2. The molding control method of claim 1, wherein the thickness of the body preform layer is 40% -70% of the target thickness of the barrel body layup area.
3. 3. The molding control method of claim 1, wherein the progressive localized reinforcement ply of the flange reinforcement ply area is a plurality of plies, each ply being followed by an intermediate compaction process.
4. 4. The molding control method of claim 1, wherein the integrally closed layup is a continuous layup covering the entire article.
5. 5. The molding control method of claim 1, wherein the segmented pressure equalizing structure comprises a plurality of mutually independent pressure equalizing plate segments, the pressure equalizing plate segments being distributed along an axial direction of the article or along a circumferential direction of the article.
6. 6. The molding control method of claim 5, wherein the expansion compensating gap width between adjacent equalizing plate segments is 1 to 1.5mm.
7. 7. The molding control method according to claim 1, wherein the target thickness of the cylinder body ply area is 2 to 4mm, and the target thickness of the flange reinforcing ply area is 4 to 8mm.
8. 8. The molding control method of claim 1, wherein the composite material is a carbon fiber reinforced epoxy resin based composite material.
9. 9. The molding control method of claim 1, wherein the molding support structure is a composite mold formed by detachably connecting a plurality of mold segments, the mold segments respectively corresponding to the barrel body laying area and the flange reinforcing laying area.
10. 10. The molding control method according to any one of claims 1 to 9, characterized in that after the press curing is completed, the workpiece can be further subjected to machining and quality inspection to obtain a finished product meeting design requirements.

Description

Integrated forming control method for composite material force bearing barrel with inconsistent thickness Technical Field The invention relates to the technical field of composite material forming and manufacturing, in particular to an integrated forming control method of a composite material force-bearing cylinder with inconsistent thickness. Background Composite loaders are key load bearing components in a rocket pod and typically include a body and upper and lower flange structures integrally connected to the body. To meet satellite installation and load bearing requirements, the flange region is typically constructed to have a thickness substantially greater than the thickness of the barrel body, thereby forming an overall structure of inconsistent thickness. In the prior art, the bearing cylinders are mostly prepared by adopting a compression molding or fiber winding molding mode. The compression molding is dependent on an integral die with complex structure and high precision requirement, the manufacturing cost is higher, the requirement on the thickness consistency of the prepreg is strict, and when the thickness difference between the processing flange and the cylinder body is larger, the process parameter control difficulty is high and the molding consistency is poor. In the forming mode, as the thickness difference of the cylinder body and the flange area is obvious in the same curing period, the response characteristics of different areas in the processes of pressurization, resin flow and curing shrinkage are different, and defects such as resin enrichment, dry spots or internal stress concentration and the like are easily caused in a transition area, so that the nondestructive testing passing rate and the mechanical property consistency of a finished piece are reduced. Therefore, there is still a need in the art for a control method that can achieve stable integrated formation of composite load bearing cylinders of inconsistent thickness in the same curing cycle. Disclosure of Invention The invention aims to provide an integrated forming control method of a composite material bearing cylinder with inconsistent thickness, which realizes stable integrated forming of a cylinder body and a flange structure in the same curing period by systematic control of layering region division, layering sequence and a pressed coordination mode, and improves the quality consistency and the forming qualification rate of a finished product. In order to achieve the above purpose, the present invention adopts the following technical scheme: an integrated forming control method of a composite material force-bearing cylinder with inconsistent thickness comprises the following steps: a) Dividing a workpiece into a barrel body paving region and a flange reinforcing paving region along the axial direction according to the structural characteristics of the bearing barrel, and respectively setting target thickness, wherein the target thickness of the flange reinforcing paving region is larger than that of the barrel body paving region; b) Firstly, performing basic layering on a barrel body layering area on a forming supporting structure to form a body preformed layer with initial bearing capacity; c) After the main body preformed layer is formed, carrying out progressive local reinforcement layering only in a flange reinforcement layering area, and gradually constructing a flange structure with the thickness larger than that of the main body of the cylinder; d) After the flange reinforcing layering is completed, integrally closing the layering area of the main body of the cylinder and the flange reinforcing layering area to form a continuous integrated layering structure; e) Arranging sectional pressure equalizing structures on the outer surface of a finished product after layering, and reserving expansion compensation gaps between adjacent pressure equalizing structures to coordinate the pressure-bearing state of areas with different thickness in the pressurizing and curing process; f) And placing the finished piece with the layering and pressure equalizing structure in a pressurizing and curing environment, and completing pressurizing and curing in the same curing period to realize the integrated molding of the composite material bearing barrel with inconsistent thickness. Preferably, the thickness of the main body preformed layer is 40% -70% of the target thickness of the main body layering region of the cylinder body. Preferably, the progressive local reinforcement ply of the flange reinforcement ply area is a plurality of plies, and the intermediate compaction treatment is carried out after each ply. Preferably, the integral occlusive layering is a continuous layering that covers the entire article. Preferably, the sectional type pressure equalizing structure comprises a plurality of mutually independent pressure equalizing plate sections, and the pressure equalizing plate sections are distributed along the axial direc