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

Abstract

The invention discloses a method for improving the forming quality of a double-R-angle area of a T-shaped rib in the technical field of composite products, which is characterized by comprising the following steps of: 1) firstly, closing a double-L mold; (2) filling a double-R-angle folding part of a closed mold with material wires, and then putting a core material; (3) after the core material is placed, the core material is controlled to be slightly higher than the double-L-shaped blank, then a non-porous isolating membrane which is slightly wider than the core material is placed in a core material area, and heat sealing is conducted; and (4) height inspection is conducted on the core material area obtained after heat sealing and pressing, the non-hole isolating film is torn off before inspection, filling is unqualified when white is displayed in the area during inspection, then filling compensation is conducted on the situation that filling is insufficient, and a qualified double-R-angle area is obtained after compensation.

Description

Technical Field

[0001] The present invention relates to the technical field of composite products, and in particular to a method for improving the molding quality of composite products. Background Art

[0002] The composite T-shaped reinforcement is generally composed of a double L structure 101, 102 + a bottom plate structure 103, such as Figure 2-3 As shown in the figure, the existing T-shaped rib forming tooling is composed of a double L mold + a bottom plate tooling. After curing, the R area 104 of the double L structure 101 and 102 has delamination, dispersion, wrinkles and other phenomena. The existing technical means are not comprehensive enough. Simply using heat sealing and pressing and other means cannot solve the problem of internal and external quality defects. In the molding process, there may be inconsistent mold gaps at both ends of the tooling, resulting in one side of the tooling being tight and the other side of the tooling being loose during curing, resulting in delamination of the parts, rich resin or dispersion. At the same time, insufficient filling of the core material during the molding process may cause delamination of the R area. Looseness leads to collapse of the bottom plate R zone, which places high demands on the filling amount of the core material; the R zone of the large curvature T-shaped rib is delaminated, which may be that the core material is not disconnected at the position with larger curvature, resulting in the rebound of the core material during curing and the scrapping of the parts; there will be glue deficiency in the edge strip area and the web surface, and point-shaped or block-shaped pits. This is caused by excessive resin loss during the curing process and no reasonable glue blocking; the uneven pressure transmission of the soft mold tooling during the curing process leads to delamination of the R zone, etc. The above situations all occur in the production process, and there is no systematic method to avoid the problem at the front end of curing. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for improving the forming quality of the double R-angle area of a T-shaped rib, thereby solving the internal and external quality problems that occur during the forming process of the T-shaped rib.

[0004] The object of the present invention is achieved as follows: a method for improving the forming quality of the double R-angle area of a T-shaped rib, comprising the following steps: Step 1) First, close the double L mold; Step 2) Fill the double R corners of the mold with wire and then add the core material; Step 3) After placing the core material, ensure that the core material is slightly higher than the double L-shaped blank. Then, place a non-porous isolation 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. Remove the non-porous isolation film before inspection. During the inspection, if the area shows white, it is unqualified. Then fill the area that is not filled enough to obtain a qualified double R corner area after compensation. Step 5) Perform mold assembly of the base plate.

[0005] Furthermore, in step 1), the gap between the double L molds needs to be measured before mold closing. If the gap is too large, it needs to be repaired. If the gap meets the design requirements, it proceeds to the next process.

[0006] Furthermore, in step 2) when filling the filament, the core material is slightly shaken when it is placed in, and no more core material is added.

[0007] Furthermore, in step 5), the parts need to be edge-sealed with bars before mold assembly.

[0008] Furthermore, the edge sealing of the baffle specifically includes: using a rubber strip to block the glue, and using a pressure-sensitive tape to connect the rubber strip and the blank, with the pressure-sensitive tape slightly overlapping the blank by 0.5-1 mm.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention optimizes and innovates the production process of T-shaped ribs, effectively avoids the problems of resin-rich R zone after molding, wrinkles, abnormal mold adhesion and abnormal internal quality, and improves the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0011] Figure 1 It is a schematic diagram of the process of the present invention.

[0012] Figure 2 It is a schematic diagram of the T-shaped rib structure in the present invention.

[0013] Figure 3 This is an end view of the T-shaped rib in the present invention.

[0014] Figure 4 Schematic diagram of the R area of the T-shaped rib in the present invention.

[0015] Figure 5 This is a diagram showing the state of placing a non-porous isolation membrane in the present invention.

[0016] Figure 6 This is a state diagram of the R area of the non-porous isolation film being torn off in the present invention.

[0017] Among them, 101 and 102 double L structures, 103 bottom plate structure, 104 R area, 105 filament, and 106 core material. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1-3 A control method for improving the forming quality of T-shaped ribs is shown, comprising the following steps: Step 1) Raw material re-inspection and preparation: When materials are put into storage, check whether the types, brands and manufacturers of all raw materials involved in the molding of the trailing edge strip meet the requirements, accept the raw material certificates and re-inspect the raw materials; collect 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 standby use; before use, check the material certificates, re-inspection certificates and whether they are within the validity period. The bags can only be opened for use when there is no moisture inside or outside.

[0020] 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 process. Before paving, use absorbent cotton (or wiping paper) dipped in an appropriate amount of acetone to clean the surface of the double L mold paving surface until the gauze has no discoloration. Let it dry at room temperature for more than 15 minutes, then treat the paving surface with a release agent for at least 3 times. After drying, it can be paved.

[0021] Step 3) Material Preparation: Collect 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 for standby use; before use, check the material certificate, re-inspection certificate, and whether it is within the validity period. The bag can only be opened for use if there is no moisture inside or outside.

[0022] Step 4) Cutting: Lay out and cut materials according to the cutting drawing, and arrange the pieces to ensure that the angle and quantity of the pieces meet the stacking requirements.

[0023] Step 5) Laying: Start laying from the edge strip surface, ensure that the fracture does not appear on the edge strip surface, and lay according to the laying angle, from the middle to both sides, from the edge strip surface to the web area, compact, squeeze out the stacking gas, and perform vacuum pre-compaction every 1-4 layers.

[0024] Step 6) Make filaments: Cut out the sheet of material that meets the core material size as required, roll it into wire, press out two arc-shaped surfaces on the core material tooling, assemble it, use a cover plate + hollow isolation film + breathable felt + vacuum bag, and heat seal and press to obtain the filaments.

[0025] Step 7) Mold assembly: Clamp the two L molds together, making sure there is no offset and the bottom surfaces are on the same level. Then fill the R area with 2mm, 3mm, 5mm, 7mm, and 10mm filaments, such as Figure 4 As shown, ensure that the top of the R area is completely filled, then place the core material in the R area. The core material is slightly higher than the blank, with a slight shake. Use an iron to flatten it. The core material is slightly higher than the blank by 1-2mm. Place the bottom plate tooling (simulating the bottom plate structure). During assembly, place (pave) a non-porous isolation film slightly wider than the core material by 20mm on the surface of the core area, as shown. Figure 5 As shown, use breathable felt + vacuum bag for assembly. Step 14) Heat sealing: Perform according to conventional heat sealing parameters.

[0026] Step 15) Bottom plate laying: After the can is taken out, remove the bottom plate tooling, check the core material condition, and tear off the non-porous isolation film. Figure 6 As shown, check whether the R area is fully compacted. The core material filling area that meets the requirements is slightly higher than the blank and there is no deformation during rolling. The core material filling area that meets the requirements is white and needs to be refilled and heat-sealed. Trim the core material surface to be flush with the blank, stack the bottom plate sheets, and perform vacuum compaction.

[0027] 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 overlaps the blank by 0.5-1mm. Place the bottom mold and use two layers of porous isolation film + breathable felt + vacuum bag for assembly.

[0028] Step 17) Autoclave curing: Check the vacuum bag for air leaks and perform the autoclave curing procedure according to the material parameters.

[0029] Step 18) Demolding: Remove auxiliary materials and mark the parts with drawing numbers.

[0030] Step 19) Follow the corresponding process files and perform cutting and tolerance control according to the part line.

[0031] Step 20) Non-destructive testing: Acceptance is carried out according to the corresponding technical conditions.

[0032] 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 notes.

[0033] Step 22) Inspection of furnace parts: Conduct mechanical property tests on furnace parts according to corresponding technical conditions to determine the eligibility of furnace parts.

[0034] Step 23) Final Inspection: The production process of the parts is recorded completely and clearly, and the appearance is checked according to the technical requirements; non-destructive testing; performance testing of the furnace parts; weighing; thickness measurement. The surface quality and appearance meet the acceptance standards and manufacturing outline requirements.

[0035] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for improving the forming quality of the double R-angle area of T-shaped ribs, characterized in that: The following steps are involved: Step 1) First, close the double L mold; Step 2) Fill the double R corners of the mold with wire and then add the core material; Step 3) After placing the core material, ensure that the core material is slightly higher than the double L-shaped blank. Then, place a non-porous isolation 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. Remove the non-porous isolation film before inspection. During the inspection, if the area shows white, it is unqualified. Then fill the area that is not filled enough to obtain a qualified double R corner area after compensation. Step 5) Perform mold assembly of the base plate.

2. A method for improving the forming quality of T-shaped ribs according to claim 1, characterized in that: Step 1) Before closing the mold, the gap between the double L molds needs to be measured. If the gap is too large, it needs to be repaired. If the gap meets the design requirements, it will proceed to the next process.

3. A method for improving the forming quality of T-shaped ribs according to claim 1 or 2, characterized in that: Step 2) When filling the filament, shake the core material slightly when putting it in, and then do not add any more core material.

4. A method for improving the forming quality of T-shaped ribs according to claim 1 or 2, characterized in that: Step 5) The parts need to be edge-sealed with strips before mold assembly.

5. A method for improving the forming quality of T-shaped ribs according to claim 4, characterized in that: The edge sealing of the baffle strip specifically includes: using a rubber strip to block the glue, and using a 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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