Automatic laying forming method of U-shaped PET and CFRT composite connecting skirt
Through an automatic laying molding method, the problem of lack of automatic laying technology in the production of U-shaped PET+CFRT composite joint skirts is solved, and efficient production and weight reduction effects are achieved.
Patent Information
- Application Number
- CN202510043362.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-03-14
AI Technical Summary
The prior art lacks automatic laying and forming methods for U-shaped PET+CFRT composite joint skirts, resulting in the inability to efficiently produce such composite materials.
An automatic laying and forming method is adopted, including manufacturing a molding mold that matches the inner surface shape of the U-shaped PET+CFRT composite connecting skirt, cutting the PET+CFRT composite prepreg silk, and automatically laying the wire on the surface of the molding mold using a laying and winding machine, and then solidifying it through a vacuum bag and a hot press tank, and finally taking out the mold to obtain the U-shaped PET+CFRT composite connecting skirt.
The automatic production of U-shaped PET+CFRT composite connecting skirt is realized, which improves production efficiency and meets the weight reduction needs of composite materials instead of metal materials.
Smart Images
Figure CN119610725A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an automatic laying and molding method for a U-shaped PET+CFRT composite connecting skirt, belonging to the technical field of composite material molding. Background Art
[0002] PET foam, the main component is polyethylene terephthalate (Polyethylene terephthalate), commonly known as polyester resin. Polyethylene terephthalate (polyester resin) is mainly used to make synthetic fibers, films, bottles, and is also used in engineering plastics and other fields. When it is foamed, the PET foam material formed later is relatively brittle, but it has good heat resistance and mechanical strength. PET foam can be recycled, so it has good environmental performance. CFRT, that is, continuous fiber reinforced thermoplastic composite materials, CFRT materials are widely used in many industries such as shipping, aviation, and rail transportation due to their high strength and low density.
[0003] High-performance PET composite materials are widely used in aerospace, navigation, sports and leisure products, civil engineering, medical equipment, new energy vehicles and other fields. Based on its high strength, high toughness and light weight, it has become an important strategic basic material for the country. At present, it has become an inevitable trend to replace metal materials with composite materials with good lightness and high strength. Therefore, by designing U-shaped PET+CFRT composite connection skirts instead of pure metal connection skirts, the purpose of weight reduction can be effectively achieved. However, the existing technology lacks an automatic laying and molding method for U-shaped PET+CFRT composite connection skirts. Summary of the invention
[0004] The purpose of the present invention is to overcome the technical defects of the prior art, solve the above-mentioned technical problems, and propose an automatic laying and forming method for a U-shaped PET+CFRT composite connecting skirt.
[0005] The present invention specifically adopts the following technical solution: an automatic laying and forming method of a U-shaped PET+CFRT composite connecting skirt, characterized in that it comprises the following steps:
[0006] Step SS1: manufacturing a molding die matching the inner surface shapes of the transverse surface and two longitudinal surfaces of the U-shaped PET+CFRT composite connection skirt;
[0007] Step SS2: cutting PET+CFRT composite prepreg;
[0008] Step SS3: After determining the laying angle, laying sequence and laying position according to the load and size requirements of the U-shaped PET+CFRT composite connecting skirt, the PET+CFRT composite prepreg is automatically laid on the surface of the forming mold using a laying and winding integrated machine; in the automatic laying process, after the laying head has completed laying the first longitudinal surface, when laying it to the corner of the first longitudinal surface and the transverse surface, the laying head lays the transverse surface to the corner of the second longitudinal surface and the transverse surface, and the pressure roller is separated from the surface of the forming mold. The laying head lays the wire upward by 1.0 to 1.2 times the height of the second longitudinal surface, cuts off the wire bundle, and then the forming mold rotates by 1 yarn width by an angle of yarn width / connecting skirt circumference × 360°, and the laying head returns to the starting laying point. After completing the single-layer laying action, the PET+CFRT composite prepreg on the first longitudinal surface and the second longitudinal surface are compacted, and the laying is cyclically carried out layer by layer until the laying is completed;
[0009] Step SS4: curing the PET+CFRT composite prepreg on the molding die by using a vacuum bag and an autoclave;
[0010] Step SS5: Remove from the molding die to obtain the U-shaped PET+CFRT composite connecting skirt.
[0011] As a preferred embodiment, the PET+CFRT composite prepreg is an intermediate formed by uniformly impregnating CFRT continuous reinforcing fibers with molten PET foaming resin in a continuous production manner.
[0012] As a preferred embodiment, the preparation method of the PET+CFRT composite prepreg includes: the raw material components for preparing the PET foaming resin, including 80-100 parts of ethylene glycol, 80-100 parts of terephthalic acid, 3-15 parts of chain extender, 1-15 parts of solubilizer, 5-25 parts of polyacid, 5-25 parts of polyol, and 1-10 parts of foaming agent, are formed into a molten PET foaming resin at a temperature of 230-250°C, and the CFRT continuous reinforcing fiber is uniformly impregnated with the prepared molten PET foaming resin in a continuous production mode to obtain the PET+CFRT composite prepreg.
[0013] As a preferred embodiment, in step SS3, after the surface of the molding mold is wrapped with a polytetrafluoroethylene layer, it is installed on a laying and winding integrated machine for 90° laying. The 90° laying is as follows: the laying head angle is adjusted to make it perpendicular to the surface of the molding mold, the pressure roller is pressed against the surface of the molding mold, and the molding mold is rotated in a circular direction to perform dry winding molding.
[0014] As a preferred embodiment, in the step SS3, the surface of the molding die is wrapped with a polytetrafluoroethylene layer and then installed on the laying and winding integrated machine for 0° laying, and the 0° laying includes the following steps: Step A: Laying and compacting the PET+CFRT composite prepreg from the laying starting point of the molding die, and when automatically laying to the corner of the second longitudinal surface and the transverse surface of the molding die, separating the pressing roller from the surface of the molding die, and laying the wire upward with a laying head of 1.0 to 1.2 second longitudinal surface height, and cutting the wire bundle;
[0015] Step B: rotating the forming mold by an angle of yarn width of yarn width / connecting skirt circumference×360°, returning the placement head to the starting point of the mold for placing the yarn, and simultaneously compacting the first longitudinal surface and the second longitudinal surface by using a pressure roller;
[0016] Step C: Repeat steps A and B in sequence until a single layer of 0° laying is completed.
[0017] As a preferred embodiment, in step SS4, when autoclave curing is adopted, the curing temperature is 185-210° C., the curing time is 3-4 hours, and the curing pressure is 0.8-1.0 MPa.
[0018] As a preferred embodiment, the thickness of the first longitudinal surface and the second longitudinal surface is 1-3 mm.
[0019] As a preferred embodiment, the thickness of the transverse surface is 2 to 3 mm.
[0020] Beneficial effects achieved by the present invention: The present invention aims to solve the problem that it has become an inevitable trend to replace metal materials with composite materials that are lightweight and high in strength. Therefore, by designing a U-shaped PET+CFRT composite connecting skirt to replace a pure metal connecting skirt, the purpose of weight reduction can be effectively achieved. However, the prior art lacks the technical requirements for an automatic laying and molding method for a U-shaped PET+CFRT composite connecting skirt. An automatic laying and molding method for a U-shaped PET+CFRT composite connecting skirt is provided, comprising manufacturing a molding mold that matches the inner surface shape of the transverse surface and two longitudinal surfaces of the U-shaped PET+CFRT composite connecting skirt; cutting PET+CFRT composite prepreg yarns; after determining the laying angle, laying sequence and laying position according to the load and size requirements of the U-shaped PET+CFRT composite connecting skirt, the PET+CFRT composite prepreg yarns are automatically laid on the surface of the molding mold using a laying and winding all-in-one machine; during the automatic laying process, a laying head lays the first longitudinal surface After the wire is completed, when it is laid to the corner of the first longitudinal surface and the transverse surface, the laying head lays the transverse surface to the corner of the second longitudinal surface and the transverse surface, separates the pressure roller from the surface of the molding mold, and the laying head lays the wire upward by 1.0 to 1.2 second longitudinal surface heights, cuts the wire bundle, and then the molding mold rotates 1 yarn width at an angle of yarn width / connecting skirt circumference × 360°, and the laying head returns to the starting laying point. After completing the single-layer laying action, the PET+CFRT composite prepreg wires on the first and second longitudinal surfaces are compacted, and the laying is cyclically layered until the laying is completed; the PET+CFRT composite prepreg wires on the molding mold are cured by a vacuum bag and an autoclave; the U-shaped PET+CFRT composite connecting skirt is obtained by removing the molding mold. Overall, by designing a U-shaped PET+CFRT composite connecting skirt instead of a pure metal connecting skirt, the purpose of weight reduction can be effectively achieved, which completely solves the technical demand of the existing technology for the automatic laying and molding method of the U-shaped PET+CFRT composite connecting skirt. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic structural diagram of the U-shaped PET+CFRT composite connecting skirt of the present invention.
[0022] Figure 2 It is a schematic diagram of the molding die principle of the automatic placement molding method of a U-shaped PET+CFRT composite connecting skirt of the present invention.
[0023] The meaning of the marks in the figure: 1-U-shaped PET+CFRT composite connecting skirt, 2-molding mold, 3-pressing roller. DETAILED DESCRIPTION
[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.
[0025] Example 1: Figure 1 and Figure 2 As shown, the present invention proposes an automatic placement and molding method for a U-shaped PET+CFRT composite connecting skirt, comprising the following steps:
[0026] Step SS1: manufacturing a molding die 2 that matches the inner surface shapes of the transverse surface and two longitudinal surfaces of the U-shaped PET+CFRT composite connecting skirt 1;
[0027] Step SS2: cutting PET+CFRT composite prepreg;
[0028] Step SS3: After determining the laying angle, laying sequence and laying position according to the load and size requirements of the U-shaped PET+CFRT composite connecting skirt 1, the PET+CFRT composite prepreg is automatically laid on the surface of the forming mold 2 by using a laying and winding integrated machine; in the automatic laying process, after the laying head completes laying the first longitudinal surface, when laying it to the corner of the first longitudinal surface and the transverse surface, the laying head lays the transverse surface to the corner of the second longitudinal surface and the transverse surface, and the pressure roller 3 is separated from the surface of the forming mold 2. The laying head lays 1.0 to 1.2 times the height of the second longitudinal surface upward, cuts off the filament bundle, and then the forming mold 2 rotates by an angle of 1 yarn width that is yarn width / connecting skirt circumference × 360°, and the laying head returns to the starting laying point. After completing the single-layer laying action, the PET+CFRT composite prepreg on the first longitudinal surface and the second longitudinal surface are compacted, and the laying is cyclically performed layer by layer until the laying is completed;
[0029] Step SS4: curing the PET+CFRT composite prepreg on the molding die by using a vacuum bag and an autoclave;
[0030] Step SS5: Remove from the molding die 2 to obtain the U-shaped PET+CFRT composite connecting skirt 1.
[0031] Optionally, the PET+CFRT composite prepreg is an intermediate formed by uniformly impregnating CFRT continuous reinforcing fibers with molten PET foaming resin in a continuous production manner.
[0032] Optionally, the preparation method of the PET+CFRT composite prepreg includes: forming a molten PET foaming resin at a temperature of 230-250°C with raw material components for preparing the PET foaming resin, including 80-100 parts of ethylene glycol, 80-100 parts of terephthalic acid, 3-15 parts of chain extender, 1-15 parts of solubilizer, 5-25 parts of polyacid, 5-25 parts of polyol, and 1-10 parts of foaming agent, and then uniformly impregnating the CFRT continuous reinforcing fiber with the prepared molten PET foaming resin in a continuous production mode to obtain the PET+CFRT composite prepreg.
[0033] Optionally, in step SS3, after a polytetrafluoroethylene layer is wrapped around the surface of the molding mold 2, the molding mold 2 is installed on a laying and winding integrated machine for 90° laying. The 90° laying comprises: adjusting the laying head angle so that it is perpendicular to the surface of the molding mold 2, pressing the pressure roller 3 against the surface of the molding mold 2, and rotating the molding mold 2 in a circular direction for dry winding molding.
[0034] Optionally, in step SS3, the surface of the molding die 2 is wrapped with a polytetrafluoroethylene layer and then installed on the laying and winding integrated machine for 0° laying, and the 0° laying includes the following steps:
[0035] Step A: Lay and compact the PET+CFRT composite prepreg from the starting point of the laying of the molding die 2, and when it is automatically laid to the corner of the second longitudinal surface and the transverse surface, separate the pressing roller 3 from the surface of the molding die 2, and lay the wire upward by 1.0 to 1.2 second longitudinal surface heights to cut the wire bundle;
[0036] Step B: the forming mold 2 is rotated by an angle of yarn width of yarn width / circumference of connecting skirt×360°, the placement head returns to the starting point of the mold placement, and the first longitudinal surface and the second longitudinal surface are compacted by the pressing roller 3 at the same time;
[0037] Step C: Repeat steps A and B in sequence until a single layer of 0° laying is completed.
[0038] Optionally, in step SS4, when autoclave curing is adopted, the curing temperature is 185-210° C., the curing time is 3-4 hours, and the curing pressure is 0.8-1.0 MPa.
[0039] Optionally, the thickness of the first longitudinal surface and the second longitudinal surface is 1 to 3 mm.
[0040] Optionally, the thickness of the cross surface is 2 to 3 mm.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. An automatic laying and forming method for a U-shaped PET+CFRT composite connecting skirt, characterized in that: The steps include: Step SS1: manufacturing a molding die (2) matching the inner surface shape of the transverse surface and two longitudinal surfaces of the U-shaped PET+CFRT composite connecting skirt (1); Step SS2: cutting PET+CFRT composite prepreg; Step SS3: after determining the laying angle, laying sequence and laying position according to the load and size requirements of the U-shaped PET+CFRT composite connecting skirt (1), the PET+CFRT composite prepreg is automatically laid on the surface of the forming mold (2) by using a laying and winding integrated machine; during the automatic laying process, after the laying head has completed laying the first longitudinal surface, when laying it to the corner of the first longitudinal surface and the transverse surface, the laying head lays the transverse surface to the corner of the second longitudinal surface and the transverse surface, the pressure roller (3) is separated from the surface of the forming mold (2), the laying head lays the wire upward by 1.0 to 1.2 times the height of the second longitudinal surface, and the wire bundle is cut off, and then the forming mold (2) rotates by 1 yarn width angle of yarn width / connecting skirt circumference × 360°, the laying head returns to the starting laying point, and after completing the single-layer laying action, the PET+CFRT composite prepreg on the first longitudinal surface and the second longitudinal surface are compacted, and the laying is cyclically performed layer by layer until the laying is completed; Step SS4: curing the PET+CFRT composite prepreg on the molding die (2) by using a vacuum bag and an autoclave; Step SS5: The U-shaped PET+CFRT composite connecting skirt (1) can be obtained by removing the molding die (2).
2. The automatic laying and forming method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: The PET+CFRT composite prepreg is an intermediate formed by uniformly impregnating CFRT continuous reinforcing fibers with molten PET foaming resin in a continuous production mode.
3. The automatic laying and forming method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: The preparation method of the PET+CFRT composite prepreg comprises: forming a molten PET foaming resin at a temperature of 230-250° C. with raw material components prepared from the PET foaming resin, including 80-100 parts by weight of ethylene glycol, 80-100 parts of terephthalic acid, 3-15 parts of a chain extender, 1-15 parts of a solubilizer, 5-25 parts of a polyacid, 5-25 parts of a polyol, and 1-10 parts of a foaming agent; and then uniformly impregnating the CFRT continuous reinforcing fiber with the prepared molten PET foaming resin in a continuous production mode to obtain the PET+CFRT composite prepreg.
4. The automatic laying and forming method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: In step SS3, after the surface of the molding mold (2) is wrapped with a polytetrafluoroethylene layer, it is installed on a laying and winding integrated machine for 90° laying. The 90° laying is as follows: the laying head angle is adjusted so that it is perpendicular to the surface of the molding mold (2), the pressure roller (3) is closely attached to the surface of the molding mold (2), and the molding mold (2) is rotated in a circular direction to perform dry winding molding.
5. The automatic placement molding method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: In step SS3, the surface of the molding die (2) is wrapped with a polytetrafluoroethylene layer and then mounted on the laying and winding integrated machine for 0° laying. The 0° laying includes the following steps: Step A: laying and compacting the PET+CFRT composite prepreg from the laying starting point of the molding die (2), and when the prepreg is automatically laid to the corner of the second longitudinal surface and the transverse surface, the pressing roller (3) is separated from the surface of the molding die (2), and the laying head lays the prepreg upwards by 1.0 to 1.2 second longitudinal surface heights, and cuts the prepreg bundle; Step B: Rotate the forming mold (2) by an angle of 1 yarn width (yarn width / connecting skirt circumference × 360°), return the placement head to the starting point of the mold for laying, and simultaneously use the pressure roller (3) to compact the first longitudinal surface and the second longitudinal surface; Step C: Repeat steps A and B in sequence until a single layer of 0° laying is completed.
6. The automatic placement molding method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: In the step SS4, when the autoclave is used for curing, the curing temperature is 185-210° C., the curing time is 3-4 hours, and the curing pressure is 0.8-1.0 MPa.
7. The automatic placement molding method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: The thickness of the first longitudinal surface and the second longitudinal surface is 1 to 3 mm.
8. The automatic placement molding method of a U-shaped PET+CFRT composite connecting skirt according to claim 1 is characterized in that: The thickness of the transverse surface is 2 to 3 mm.