Sample piece quality control method for carbon fiber vacuum diversion process

Abstract

The invention discloses a sample piece quality control method for a carbon fiber vacuum flow guide process. The sample piece quality control method comprises the following steps: coating a carbon fiber sample piece on a mold; a reinforcing inner skeleton is fixedly arranged on the carbon fiber sample piece; a positioning insert is installed on the mold, a mounting plate is connected to the positioning face of the positioning insert in a positioning mode, and the mounting plate is fixedly arranged on the carbon fiber sample piece or the reinforced inner skeleton; and the carbon fiber sample piece is installed on a mold to be dried. The carbon fiber sample piece has the advantages that the reinforcing inner skeleton is additionally arranged on the back of the carbon fiber sample piece, so that the rigidity of the carbon fiber sample piece can be improved, the deformation resistance of the carbon fiber sample piece is improved, and meanwhile, a mounting position can be provided for the mounting plate; on the basis of a common resin mold, the rigidity of the mold is increased by adding the metal supporting base at the bottom of the mold, the resin mold body can be prevented from deforming in the processes of drying, moving and the like, deformation of a carbon fiber sample caused by mold deformation is avoided, and the mold stably supports the carbon fiber sample.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber samples, and in particular to a sample quality control method for a carbon fiber vacuum induction process. Background Art

[0002] Carbon fiber technology is being used more and more widely in various industries due to its technical advantages, especially in the aviation and automotive industries, where the development trend is rapid. In the field of automobile trial production, the vacuum infusion process of carbon fiber is widely used because of its low equipment threshold, simple production process, low cost and short cycle. However, the quality problems of carbon fiber vacuum infusion process samples have always troubled users, mainly manifested in sample warping and deformation, low precision and other aspects. At present, most of them use carbon fiber molds made of metal or fiberglass to improve the mold's high temperature resistance and deformation resistance and improve the quality of samples. However, the replacement of mold materials has greatly increased the material cost and significantly increased the processing cycle, and the accuracy of key dimensions still cannot fully meet the requirements. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present invention provides a sample quality control method for a carbon fiber vacuum infusion process, and a reinforced internal skeleton is arranged on the carbon fiber sample to improve the stiffness of the carbon fiber sample.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A sample quality control method for a carbon fiber vacuum infusion process comprises the following steps:

[0006] Step 100, coating a carbon fiber sample on a mold;

[0007] Step 200, fixing and setting a reinforced endoskeleton on the carbon fiber sample;

[0008] Step 300: Install a positioning insert on the mold, position and connect a mounting plate on the positioning surface of the positioning insert, and fix the mounting plate to the carbon fiber sample or the reinforced endoskeleton;

[0009] Step 400: Install the carbon fiber sample on the mold and dry it.

[0010] Furthermore, the mold includes a mold body and a support base arranged at the bottom of the mold body, thereby improving the overall rigidity of the mold body.

[0011] Furthermore, the support base is bonded to the mold body by an adhesive, so that the mold body and the support base are reliably and firmly connected.

[0012] Furthermore, the reinforced endoskeleton is configured as a round steel tube structure so that the reinforced endoskeleton can provide stable support for the carbon fiber sample.

[0013] Furthermore, the reinforced endoskeleton is bonded to the surface of the carbon fiber sample by an adhesive, so that the reinforced endoskeleton and the carbon fiber sample are reliably and firmly connected.

[0014] Furthermore, the positioning insert can be detachably arranged on the mold body, and the positioning surface of the positioning insert can be flexibly set.

[0015] Further, the method for positioning and connecting the mounting plate on the positioning surface of the positioning insert includes:

[0016] Two first positioning holes are arranged on the mounting plate, and two second positioning holes respectively matched with the two first positioning holes are arranged on the positioning surface of the positioning insert, and the relative positions of the two second positioning holes and the mold body are matched with the relative positions of the corresponding two first positioning holes and the carbon fiber sample; the two first positioning holes are set as mounting holes of the mounting plate.

[0017] Furthermore, the mounting plate is fixed to the carbon fiber sample by adhesive, or is fixed to the reinforced endoskeleton by welding.

[0018] Furthermore, the quality control method also includes: after the carbon fiber sample is dried and cured, it is kept on the mold and CNC machining is performed on the finishing position of the carbon fiber sample, and the finishing position includes at least one of the boundary of the carbon fiber sample, the door lock mounting hole and the door lock mounting surface.

[0019] Furthermore, the adhesive is made by mixing cotton powder and polymer resin; preferably, the ratio of the cotton powder to the polymer resin is set to 1:1.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) This method can increase the stiffness of the carbon fiber sample itself and its ability to resist deformation by adding a reinforcing endoskeleton to the back of the carbon fiber sample, while also providing an installation position for the mounting plate.

[0022] (2) This method increases the rigidity of the mold by adding a metal support base at the bottom of the mold on the basis of an ordinary resin mold, which can meet the rigidity requirements of a metal mold or a fiberglass mold, prevent the resin mold body from deforming during drying, moving, etc., and avoid deformation of the carbon fiber sample caused by mold deformation, so that the mold can support the carbon fiber sample stably; it also saves material and mold processing costs, has low cost, and a short mold production cycle.

[0023] (3) This method can improve the installation accuracy of the carbon fiber sample assembly by setting a removable positioning insert on the mold body and positioning the mounting plate by the positioning insert; the key dimensions of the key positions of the carbon fiber sample are ensured by CNC milling the carbon fiber sample with the mold, and the key positions have high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0025] Figure 1 The present invention is a flow chart of a sample quality control method for a carbon fiber vacuum infusion process.

[0026] Figure 2 It is a structural schematic diagram of the mold of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the positioning insert of the present invention.

[0028] In the figure: 100-carbon fiber sample; 11-door lock mounting hole; 12-door lock mounting surface; 200-mold; 21-mold body; 211-slot; 212-threaded hole; 22-support base; 23-positioning insert; 231-positioning surface; 232-second positioning hole; 233-step hole; 300-reinforced endoskeleton; 400-mounting plate; 41-first positioning hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0030] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, it should be noted that the directions "X", "Y", and "Z" are directions indicated by the coordinate system in the accompanying drawings, which are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] The present invention provides a sample quality control method for carbon fiber vacuum infusion process, such as Figure 1 As shown, the following steps are included:

[0032] Step 100, coating the carbon fiber sample 100 on the mold 200;

[0033] Step 200, fixing and setting a reinforced endoskeleton 300 on the carbon fiber sample 100;

[0034] Step 300, installing the positioning insert 23 on the mold 200, positioning and connecting the mounting plate 400 on the positioning surface 231 of the positioning insert 23, and fixing the mounting plate 400 on the carbon fiber sample 100 or the reinforced endoskeleton 300;

[0035] Step 400: install the carbon fiber sample 100 on the mold 200 and dry it.

[0036] refer to Figure 1 and Figure 2 As shown, when the carbon fiber sample 100 is made by the vacuum induction process, after the carbon fiber sample 100 is coated on the resin mold 200, the reinforcing endoskeleton 300 is fixedly set on the carbon fiber sample 100, and then the mounting plate 400 is fixedly set on the carbon fiber sample 100 or the reinforcing endoskeleton 300. The mounting plate 400 is positioned at the installation position of the carbon fiber sample 100 by the positioning insert 23 to ensure the position accuracy of the mounting plate 400. The carbon fiber sample 100, the reinforcing endoskeleton 300 and the mounting plate 400 constitute a carbon fiber sample assembly, and then the carbon fiber sample assembly with the mold 200 is placed in a drying furnace for drying, thereby improving the stiffness of the carbon fiber sample 100, preventing the carbon fiber sample 100 from deformation, and shortening the curing time of the carbon fiber sample 100.

[0037] In one embodiment, the mold 200 includes a mold body 21 and a support base 22 disposed at the bottom of the mold body 21. The mold body 21 is generally made by CNC milling of a polymer resin material, and the support base 22 is set as a metal base, which can be made by welding a square steel pipe. The mold body 21 is a non-metallic material, and the support base 22 is a metal material. The support base 22 can be bonded and fixed to the bottom of the resin mold body 21 by an adhesive, so that the mold body 21 and the support base 22 are reliably and firmly connected. In this way, the metal base can increase the overall rigidity of the resin mold body 21, prevent the resin mold body 21 from deforming during drying, moving, etc., avoid deformation of the mold 200 causing deformation of the carbon fiber sample 100, and make the mold 200 support the carbon fiber sample 100 stably.

[0038] In one embodiment, the reinforced endoskeleton 300 is set as a round steel tube structure. The reinforced endoskeleton 300 can be made in sections by bending the round steel tube, and the sections of the round steel tube are connected by welding. After the carbon fiber sample 100 is coated, the reinforced endoskeleton 300 can be bonded to the surface of the carbon fiber sample 100 by an adhesive, so that the reinforced endoskeleton 300 of different materials is reliably and firmly connected to the carbon fiber sample 100. The reinforced endoskeleton 300 composed of round steel tubes welded on the back of the carbon fiber sample 100 can stably support the carbon fiber sample 100, improve the overall rigidity of the carbon fiber sample 100, and avoid deformation of the carbon fiber sample 100 during drying and mold opening. At the same time, the tubular reinforced endoskeleton 300 is in smooth contact with the surface of the carbon fiber sample 100, which can prevent damage to the carbon fiber sample 100. The arrangement position of the reinforced endoskeleton 300 can be determined by simulation analysis and calculation, so that the reinforced endoskeleton 300 can stably support the overall carbon fiber sample 100.

[0039] The positioning insert 23 is made of high-density wood, and the location of the positioning insert 23 corresponds to the mounting plate 400 of the carbon fiber sample 100. Figure 2 and Figure 3 As shown, the positioning insert 23 is detachably arranged on the mold body 21, and the positioning insert 23 and the mold body 21 can be positioned by the mold surface and connected by bolts. Figure 3As shown, the positioning insert 23 can be set in an L shape, a slot 211 is set on the mold body 21, a threaded hole 212 is set in the slot 211, and a step hole 233 is set on one side of the positioning insert 23. The positioning insert 23 is fixed to the surface of the mold body 21 by passing a bolt through the step hole 233 and screwed into the threaded hole 212, and the surface of the positioning insert 23 is made flat. The end of the other side of the positioning insert 23 is set as a positioning surface 231, and the mounting plate 400 is positioned by the profile feature or the positioning pin, so that the position accuracy of the mounting plate 400 can be guaranteed, that is, the position accuracy of the key connection point of the carbon fiber sample 100 can be guaranteed, so that the installation position of the carbon fiber sample assembly on the vehicle is accurate. The positioning insert 23 can be detachably arranged on the mold body 21. The positioning insert 23 can be installed after the carbon fiber sample 100 is coated to avoid interference with the coating of the carbon fiber sample 100. In addition, the positioning surface 231 of the positioning insert 23 can be flexibly set to adapt to various setting positions of the mounting plate 400 in the carbon fiber sample 100.

[0040] The method for positioning and connecting the mounting plate 400 on the positioning surface 231 of the positioning insert 23 includes:

[0041] Two first positioning holes 41 are arranged on the mounting plate 400, and two second positioning holes 232 respectively matched with the two first positioning holes 41 are arranged on the positioning surface 231 of the positioning insert 23, and the relative positions of the two second positioning holes 232 and the mold body 21 are matched with the relative positions of the corresponding two first positioning holes 41 and the carbon fiber sample 100; the two first positioning holes 41 are set as mounting holes of the mounting plate 400.

[0042] The carbon fiber sample assembly is fixed to the vehicle body through the mounting plate 400. For example, the vehicle roof is provided with a fixing plate, and the vehicle side is fixed to the fixing plate of the vehicle roof through the mounting plate 400. The setting position of the mounting plate 400 on the carbon fiber sample assembly can be determined by the positioning insert 23. Figure 3 As shown, the mounting plate 400 is arranged on the positioning surface 231 of the positioning insert 23, and the relative position with the positioning insert 23 can be determined by two second positioning holes 232, and the two second positioning holes 232 are respectively matched with the two first positioning holes 41 of the mounting plate 400. After the two first positioning holes 41 of the mounting plate 400 are aligned with the two second positioning holes 232 of the positioning surface 231 of the positioning insert 23, the X-direction and Z-direction positions of the mounting plate 400 can be determined, and the mounting plate 400 can also be prevented from rotating along the positioning surface 231; the Y-direction position of the mounting plate 400 can be determined by making the mounting plate 400 close to the positioning surface 231 of the positioning insert 23. The first positioning hole 41 of the mounting plate 400 can use the mounting hole of the mounting plate 400, and there is no need to set another positioning hole on the mounting plate 400.

[0043] There are multiple mounting plates 400, which can be made by machining steel. The mounting plate 400 is set at a key position of the carbon fiber sample assembly. According to the specific setting position of the mounting plate 400, the mounting plate 400 is fixed to the carbon fiber sample 100 by adhesive, or is fixed to the reinforced endoskeleton 300 by welding, so that the mounting plate 400 is stably and reliably connected to the carbon fiber sample 100 or the reinforced endoskeleton 300. When the mounting plate 400 is a carbon fiber sample 100, it can be directly bonded and fixed to the back of the carbon fiber sample 100 by adhesive. When the mounting plate 400 is located at the reinforced endoskeleton 300, it can be fixed to the reinforced endoskeleton 300 by welding, and the connection is more secure.

[0044] The positioning surfaces 231 or holes at some key positions of the carbon fiber sample 100 can be directly milled out on the carbon fiber sample 100 by CNC finishing, which has a simple processing technology and can improve the processing accuracy of the key positions of the carbon fiber sample 100. The quality control method also includes: after the carbon fiber sample 100 is dried and cured, it is kept on the mold 200, and CNC processing is performed on the finishing position of the carbon fiber sample 100, and the finishing position includes at least one of the boundary of the carbon fiber sample 100, the door lock installation hole 11 and the door lock installation surface 12.

[0045] After the carbon fiber sample 100 is dried and cured, it is kept on the mold 200. A position of the mold body 21 can be selected as the CNC programming origin, and the CNC processing program can be programmed according to the relative coordinates of the position to be fine-processed and the mold body 21. In this way, during the CNC processing process, the mold 200 can support the carbon fiber sample 100 and can also locate the fine-processing position through the mold body 21.

[0046] In order to improve the reliability and stability of the connection between two components of different materials, such as the resin mold body 21 and the metal support base 22, the carbon fiber sample 100 and the metal reinforced endoskeleton 300, and the carbon fiber sample 100 and the metal mounting plate 400, the two components of different materials can be bonded and fixed by an adhesive. The adhesive can be made by mixing cotton powder and polymer resin. Preferably, the mixing ratio of cotton powder and polymer resin is set to 1:1, and the mixing ratio of cotton powder and polymer resin can also be adjusted according to the needs of curing speed and bonding strength.

[0047] This method can increase the rigidity of the carbon fiber sample 100 itself and the ability of the carbon fiber sample 100 to resist deformation by adding a reinforced endoskeleton 300 to the back of the carbon fiber sample 100, and can also provide an installation position for the installation plate 400.

[0048] The method increases the rigidity of the mold 200 by adding a metal support base 22 at the bottom of the mold 200 on the basis of the ordinary resin mold 200, which can meet the rigidity requirements of the metal mold or the fiberglass mold, prevent the resin mold body 21 from deforming during drying, moving, etc., avoid deformation of the mold 200 causing deformation of the carbon fiber sample 100, and make the mold 200 support the carbon fiber sample 100 stably; and save materials and mold 200 processing costs, low cost, and short mold 200 production cycle. Taking the side of the car as an example, it can save 200,000 to 300,000 yuan. The use of the ordinary resin mold body 21 can shorten the mold 200 processing and post-processing cycle by 25% to 50% compared with the metal mold or the fiberglass mold.

[0049] The method can improve the installation accuracy of the carbon fiber sample assembly by arranging a detachable positioning insert 23 on the mold body 21 and positioning the mounting plate 400 by the positioning insert 23; the accuracy of the key dimensions of the key positions of the carbon fiber sample 100 is ensured by CNC milling the carbon fiber sample 100 with the mold 200, so that the accuracy of the key positions of the carbon fiber sample 100 can be less than 0.5mm, which is higher than the industry standard of 1-1.5mm, and the accuracy of the key positions is high.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sample quality control method for carbon fiber vacuum infusion process, characterized in that: The following steps are involved: Step 100, coating a carbon fiber sample on a mold; Step 200, fixing and setting a reinforced endoskeleton on the carbon fiber sample; Step 300: Install a positioning insert on the mold, position and connect a mounting plate on the positioning surface of the positioning insert, and fix the mounting plate to the carbon fiber sample or the reinforced endoskeleton; Step 400: Install the carbon fiber sample on the mold and dry it.

2. The sample quality control method of carbon fiber vacuum infusion process according to claim 1 is characterized in that: The mold comprises a mold body and a support base arranged at the bottom of the mold body.

3. The sample quality control method of carbon fiber vacuum infusion process according to claim 2, characterized in that: The support base is bonded to the mold body by an adhesive.

4. The sample quality control method for carbon fiber vacuum infusion process according to claim 1, characterized in that: The reinforced endoskeleton is configured as a round steel pipe structure.

5. The sample quality control method for carbon fiber vacuum infusion process according to claim 4, characterized in that: The reinforced endoskeleton is bonded to the surface of the carbon fiber sample by an adhesive.

6. The sample quality control method for carbon fiber vacuum infusion process according to claim 1, characterized in that: The positioning insert is detachably arranged on the mold body.

7. The sample quality control method for carbon fiber vacuum infusion process according to claim 1, characterized in that: The method for positioning and connecting the mounting plate on the positioning surface of the positioning insert includes: Two first positioning holes are arranged on the mounting plate, and two second positioning holes respectively matched with the two first positioning holes are arranged on the positioning surface of the positioning insert, and the relative positions of the two second positioning holes and the mold body are matched with the relative positions of the corresponding two first positioning holes and the carbon fiber sample; the two first positioning holes are set as mounting holes of the mounting plate.

8. The sample quality control method for carbon fiber vacuum infusion process according to claim 1, characterized in that: The mounting plate is fixed to the carbon fiber sample by adhesive, or fixed to the reinforced internal skeleton by welding.

9. The sample quality control method for carbon fiber vacuum infusion process according to claim 1, characterized in that: The quality control method also includes: after the carbon fiber sample is dried and solidified, it is kept on the mold and CNC machining is performed on the finishing position of the carbon fiber sample, and the finishing position includes at least one of the boundary of the carbon fiber sample, the door lock mounting hole and the door lock mounting surface.

10. The sample quality control method for carbon fiber vacuum infusion process according to claim 3, 5 or 8, characterized in that: The adhesive is made by mixing cotton powder and polymer resin; preferably, the ratio of the cotton powder to the polymer resin is set to 1:1.

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