Method for improving forming quality of double R corner area of T-shaped rib

Abstract

The application discloses a kind of improving T-shaped rib double R angle area forming quality's method in the technical field of composite product, it is characterized in that, including the following steps: step 1) first double L mould moulding;Step 2) the double R angle of moulding is filled with material silk to the joint, then put into core material;Step 3) after placing core material, control core material slightly higher than double L-shaped blank, then a non-porous isolation film slightly wider than core material is placed in core material area, heat sealing is carried out;Step 4) the height of core material area after heat sealing is checked, before checking, first tear off non-porous isolation film, when checking, white color is shown in area is not filled with qualified, then filling compensation is carried out to insufficient filling, and the double R angle area of qualified is obtained after compensation.

Description

Technical Field

[0001] This invention relates to the field of composite product technology, and in particular to a method for improving the molding quality of composite products. Background Technology

[0002] Composite T-shaped ribs are generally composed of double L-structures 101 and 102 + a base plate structure 103, such as... Figure 2-3 As shown, existing T-shaped rib molding fixtures are all composed of a double L-mold + base plate fixture. After curing, phenomena such as delamination, dispersion, and wrinkling exist in the R-zone 104 of the double L structure 101 and 102. Existing technical methods are not comprehensive enough in their analysis, and simply using heat sealing and other methods cannot solve the problem of internal and external quality defects. During the molding process, there may be inconsistent gaps between the two ends of the fixture, resulting in one side of the fixture being tight and the other side being loose during curing, leading to delamination, resin overload, or dispersion in the parts. At the same time, insufficient core material filling during the molding process may also lead to delamination in the R-zone. Looseness can lead to problems such as collapse in the base plate's R-zone, which places high demands on the core material's filling amount. Delamination in the R-zone of large-curvature T-shaped ribs may be due to the core material not being broken at the point of high curvature, causing springback during curing and resulting in part scrap. There may be insufficient resin in the flange area and web surface, resulting in dotted or blocky pits. This is caused by excessive resin loss during curing and insufficient resin blocking. Uneven pressure transmission from the soft mold tooling during curing can also lead to R-zone delamination. All of these issues can occur during manufacturing, and there is no systematic method to completely avoid these problems at the beginning of curing. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for improving the forming quality of the double R-angle region of T-shaped ribs, thereby solving internal and external quality problems that occur during the forming process of T-shaped ribs.

[0004] The objective of this invention is achieved as follows: a method for improving the forming quality of the double-radius angle region of a T-shaped rib, comprising the following steps:

[0005] Step 1) First, perform double L-shaped mold closing;

[0006] Step 2) Fill the double R-angle mating area of ​​the mold with filament, and then insert the core material;

[0007] Step 3) After placing the core material, control the core material to be slightly higher than the double L-shaped blank, and then place a non-porous release film slightly wider than the core material in the core material area for heat sealing;

[0008] Step 4) Perform a height inspection on the heat-sealed core material area. Before the inspection, remove the non-porous release film. During the inspection, if the area is white, it indicates that the filling is not qualified. Then, fill the insufficient filling area to compensate for the filling. After compensation, a qualified double R-corner area is obtained.

[0009] Step 5) Perform mold assembly of the base plate.

[0010] Furthermore, in step 1), the gap between the two L molds needs to be measured before mold closing. If the gap is too large, it needs to be reworked. If the gap meets the design requirements, the process proceeds to the next step.

[0011] Furthermore, in step 2), when filling the filaments, after slightly shaking the core material when it is placed in, no more core material is added.

[0012] Furthermore, in step 5), the parts need to be sealed with edge banding before mold assembly.

[0013] Furthermore, the edge sealing of the retaining strip specifically includes: using a rubber strip to block the glue, and using pressure-sensitive adhesive tape to connect the rubber strip and the blank, with the pressure-sensitive adhesive tape slightly overlapping the blank by 0.5-1mm.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention optimizes and innovates the manufacturing process of T-shaped ribs, effectively avoiding problems such as resin excess in the R-zone, wrinkles, abnormal mold fit, and internal quality abnormalities after molding, thereby improving the product qualification rate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the process of the present invention.

[0018] Figure 2 This is a schematic diagram of the T-shaped rib structure in this invention.

[0019] Figure 3 This is a view of the end face of the T-shaped rib in this invention.

[0020] Figure 4 This is a schematic diagram of the R-zone of the T-shaped rib in this invention.

[0021] Figure 5 This is a diagram showing the state of the non-porous isolation membrane in this invention.

[0022] Figure 6 This is a diagram showing the state of the R region after the non-porous isolation membrane is removed in this invention.

[0023] Among them, 101 and 102 are double L structures, 103 is a base plate structure, 104 is the R zone, 105 is the filament, and 106 is the core material. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-3 The method for improving the forming quality of T-shaped stiffeners, as shown, includes the following steps:

[0026] Step 1) Raw material re-inspection and preparation: When materials are put into storage, check whether the types, grades and manufacturers of all raw materials involved in the forming of the trailing edge strip meet the requirements, accept the raw material qualification certificates and conduct raw material re-inspection; take out qualified carbon fiber prepregs, etc., take them out of the cold storage in advance and place them at room temperature for more than 12 hours for use; before use, check the material qualification certificates, re-inspection certificates and whether they are within the validity period, and only open the bag if there is no moisture inside or outside.

[0027] Step 2) Tooling preparation: Measure the gap between the double L molds. If the gap is too large, it needs to be repaired. If the gap meets the design requirements, proceed to the next step. Before laying, use degreased cotton (or wiping paper) dipped in an appropriate amount of acetone to clean the surface of the double L mold laying surface until the gauze is free of discoloration. Let it air dry at room temperature for more than 15 minutes, and then treat the laying surface with release agent at least 3 times. After drying, it can be laid.

[0028] Step 3) Material preparation: Obtain qualified carbon fiber prepreg, etc., take it out of the cold storage in advance, and place it at room temperature for more than 12 hours before use; before use, check the material certificate of conformity, verification certificate and whether it is within the validity period. The bag can be opened and used only if there is no moisture inside or outside.

[0029] Step 4) Cutting: Arrange and cut the materials according to the cutting diagram, and at the same time arrange the material pieces to ensure that the angle and quantity of the material pieces meet the stacking requirements.

[0030] Step 5) Laying: Start laying from the edge surface, ensuring that the fracture does not appear on the edge surface. Lay according to the laying angle, from the middle to both sides, from the edge surface to the web area, compact, squeeze out the laid gas, and vacuum pre-compact every 1-4 layers.

[0031] Step 6) Making the filaments: Cut the filaments to the size of the core material according to the requirements, roll them into filaments, press two arc-shaped surfaces on the core material tooling, assemble them, and use a cover plate + a hollow isolation film + a breathable felt + a vacuum bag to heat seal and press to obtain the filaments.

[0032] Step 7) Mold Assembly: Join the two L-shaped molds, ensuring they are not misaligned and that their bottom surfaces are on the same horizontal plane. Then, fill the R-zone with 2mm, 3mm, 5mm, 7mm, and 10mm wire, as shown. Figure 4 As shown, ensure the top of area R is completely filled. Then place the core material into area R, slightly higher than the blank, allowing for slight movement. Use an iron to flatten it, ensuring the core material is 1-2mm higher than the blank. Place the base plate fixture (simulating the base plate structure). During assembly, place (lay) a non-porous release film slightly wider than 20mm than the core material on the surface of the core material area. Figure 5 As shown, the assembly is performed using breathable felt and vacuum bags.

[0033] Step 14) Heat sealing: Perform according to the standard heat sealing parameters.

[0034] Step 15) Bottom Plate Laying: After unloading, remove the bottom plate fixture, check the core material condition, and remove the non-porous release liner. Figure 6 As shown, check whether the R area is fully compacted. The area where the core material is filled to a qualified degree is slightly higher than the billet and does not deform when rolled. The area where the core material is not filled to a qualified degree is white and needs to be refilled and heat-sealed. Trim the surface of the core material to be flush with the billet, lay the bottom plate sheet, and vacuum compact it.

[0035] Step 16) Mold assembly: Use rubber strips to block the glue during assembly, and use pressure-sensitive tape to connect the rubber strips and the blank. The pressure-sensitive tape should overlap the blank by 0.5-1mm. Place the base mold and assemble using two layers of perforated isolation film + breathable felt + vacuum bag.

[0036] Step 17) Autoclave curing: Check for air leakage in the vacuum bag and execute the autoclave curing procedure according to the material parameters.

[0037] Step 18) Demolding: Remove auxiliary materials and mark the part with the drawing number.

[0038] Step 19) Operate according to the corresponding process documents, and cut and control tolerances according to the part lines.

[0039] Step 20) Non-destructive testing: Acceptance shall be carried out in accordance with the relevant technical conditions.

[0040] Step 21) Inspection: Use qualified instruments and compliant operations to measure thickness and weigh parts, check the appearance quality of parts, organize documents and fill in part labels.

[0041] Step 22) Inspection of furnace-mounted components: Conduct mechanical property tests on furnace-mounted components according to the relevant technical conditions to determine their qualification.

[0042] Step 23) Final inspection: The production process of the parts is recorded completely and clearly. The appearance is checked according to the technical conditions; non-destructive testing is performed; the performance of the parts is tested in the furnace; the weight is measured; the thickness is measured; and the surface quality and shape meet the acceptance standards and manufacturing outline requirements.

[0043] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for improving the forming quality of the double-R-angle region of a T-shaped rib, characterized in that, Includes the following steps: Step 1) First, perform double L-shaped mold closing; Step 2) Fill the double R-angle mating area of ​​the mold with filament, and then insert the core material; Step 3) After placing the core material, control the core material to be slightly higher than the double L-shaped blank, and then place a non-porous release film slightly wider than the core material in the core material area and perform heat sealing. Step 4) Perform a height inspection on the core material area after heat sealing. Before inspection, remove the non-porous release film. During inspection, the core material filling area is slightly higher than the blank and does not deform when rolled. If the area is white, the filling is unqualified. Then, fill and compensate for the insufficient filling. After compensation, a qualified double R-corner area is obtained. Finally, lay the bottom plate material sheet and vacuum compact it. Step 5) Perform mold assembly of the base plate; Step 6) Autoclave curing: Check for air leaks in the vacuum bag and execute the autoclave curing procedure according to the material parameters; Step 7) Demolding: Remove auxiliary materials and mark the part with the drawing number.

2. The method for improving the forming quality of the double R-angle region of a T-shaped rib according to claim 1, characterized in that, Step 1) Before closing the mold, the gap between the two L molds needs to be measured. If the gap is too large, it needs to be reworked. If the gap meets the design requirements, proceed to the next process.

3. A method for improving the forming quality of the double R-angle region of a T-shaped rib according to claim 1 or 2, characterized in that, Step 2) When filling the filament, after slightly shaking the core material, do not add any more core material.

4. A method for improving the forming quality of the double R-angle region of a T-shaped rib according to claim 1 or 2, characterized in that, Step 5) Before mold assembly, the parts need to be sealed with edge strips.

5. The method for improving the forming quality of the double R-angle region of a T-shaped rib according to claim 4, characterized in that, The edge sealing of the retaining strip specifically includes: using a rubber strip to block the glue, and using pressure-sensitive tape to connect the rubber strip and the blank, with the pressure-sensitive tape slightly overlapping the blank by 0.5-1mm.

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