Composite material mold

Abstract

The utility model discloses a composite material mold. The composite material mold comprises a metal supporting frame and a composite material molded surface, the metal supporting frame is of a grating supporting frame structure, and the composite material profile is of a composite material multi-layer structure. The metal supporting frame and the composite material profile are connected through the silica gel flexible supporting connecting points. The mold has the advantages that the thermal expansion coefficient of the mold is matched with that of a formed composite material workpiece, the formed composite material workpiece is small in deformation, high in appearance precision, low in working time and energy consumption, low in product manufacturing cost, light in weight, convenient to transfer and the like, and is particularly suitable for forming large-size composite material workpieces; wide market prospects are realized in the field of composite material manufacturing in aerospace and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of molding molds, in particular to a composite material mold. Background Art

[0002] The molding of composite parts generally needs to be carried out in a molding mold, and the molding of the final structure is completed at the same time as the material is molded. With the substantial increase in the use of composite materials in the aerospace field, in order to meet the stringent requirements of product manufacturing quality and zero-residue assembly, the size and shape accuracy of composite parts are increasingly required. The thermal expansion coefficient of molding molds made of traditional metal materials such as low-carbon steel and aluminum is much higher than that of composite parts. Especially when molding large-sized composite parts, the product size and shape accuracy cannot be guaranteed, and traditional metal molds are heavy, inconvenient to transport, and the manufacturing cycle is also long. In recent years, the thermal expansion coefficient of the Invar steel mold developed is similar to that of composite materials, but the processing efficiency is low, the thermal conductivity is poor, the mold weight is large, and the cost is high.

[0003] Therefore, it is urgent to provide a composite material mold to solve the technical problems existing in the above-mentioned prior art. Utility Model Content

[0004] The purpose of the utility model is to provide a composite material mold to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides a composite material mold, including a composite material profile and a support frame, wherein the composite material profile is arranged on the upper part of the support frame, and a plurality of flexible support connection points are arranged between the composite material profile and the support frame, and the composite material profile and the support frame are connected through the flexible support connection points.

[0006] Preferably, the support frame is a metal support frame, the metal support frame is a grid support frame structure, the metal support frame includes a plurality of longitudinal grid plates and a plurality of transverse grid plates, and the longitudinal grid plates are vertically connected and fixed to the transverse grid plates;

[0007] The flexible support connection points are silicone flexible support connection points, and the silicone flexible support connection points are fixedly arranged on the tops of the longitudinal grid plates and the transverse grid plates.

[0008] Preferably, two hanging points are provided on the two opposite side walls of the metal support frame, the two hanging points on the same side are symmetrically arranged, and the hanging points on the two side walls are symmetrically arranged; two forklift points are provided at the bottom of the metal support frame, and the two forklift points are symmetrically arranged.

[0009] Preferably, a vacuum air guide channel is provided outside the peripheral net size area of ​​the composite material profile, and a plurality of air guide holes are equidistantly provided on the vacuum air guide channel.

[0010] Preferably, laser-assisted lamination positioning holes are provided at the edges of the flanged area and the edges of the arc-shaped area of ​​the composite material profile.

[0011] Preferably, the arc-shaped area of ​​the composite material profile is provided with two reserved positions for drilling positioning hole tooling, and the reserved positions for drilling positioning hole tooling are used for installing the drilling positioning hole tooling.

[0012] Preferably, the drilling positioning hole tooling includes a drilling positioning hole tooling profile, a positioning pin and a locking bolt are connected to the drilling positioning hole tooling profile, and the drilling positioning hole tooling profile is installed to the drilling positioning hole tooling reserved position on the composite material profile through the positioning pin and the locking bolt; a drill sleeve is provided on the drilling positioning hole tooling profile, a fixing screw is connected to the drilling positioning hole tooling profile, and the drill sleeve is installed to the drilling positioning hole tooling profile through the fixing screw.

[0013] Preferably, the composite material profile is a composite material multi-layer structure, and the composite material profile includes a gel coat layer, an upper surface layer, a structural layer and a lower surface layer arranged in sequence from top to bottom; the upper surface layer and the lower surface layer are both low surface density tooling prepreg layers, and the structural layer is a high surface density tooling prepreg layer.

[0014] Compared with the prior art, the utility model has the following advantages and technical effects:

[0015] The composite material mold provided by the utility model has a composite material profile whose thermal expansion coefficients match those of the composite material part to be formed, so that composite material parts whose dimensional accuracy and appearance accuracy meet the design requirements can be manufactured, and the molded parts have small deformation, which is particularly suitable for the manufacture of large-sized composite material parts; in addition, the composite material mold is relatively light in weight, which is convenient for handling during use; and a higher heating rate can be used to complete the curing cycle of the composite material part, so as to save working hours and energy consumption, thereby reducing the manufacturing cost of the composite material part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1This is a schematic diagram of the overall structure of the composite material mold of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the metal support frame of the utility model;

[0019] Figure 3 It is a schematic diagram of prepreg ply laying of tooling for composite material profile of the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the composite material profile of the utility model;

[0021] Figure 5 It is the front view of the composite material profile of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the vacuum air guide channel of the utility model;

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the tooling for drilling positioning holes of the utility model;

[0024] Figure 8 This is a front view of the tooling for drilling positioning holes of the utility model;

[0025] In the figure: 1. Composite material profile; 2. Metal support frame; 201. Longitudinal grid plate; 202. Horizontal grid plate; 301. Laser-assisted lamination positioning hole 1; 302. Laser-assisted lamination positioning hole 2; 303. Laser-assisted lamination positioning hole 3; 304. Laser-assisted lamination positioning hole 4; 305. Laser-assisted lamination positioning hole 5; 306. Laser-assisted lamination positioning hole 6; 307. Laser-assisted lamination positioning hole 7; 308. Laser-assisted lamination positioning hole 8; 309. Laser-assisted lamination positioning hole 9; 310. Laser-assisted lamination positioning hole Hole ten; 4, vacuum air guide channel; 501, hanging point one; 502, hanging point two; 503, hanging point three; 504, hanging point four; 601, forklift point one; 602, forklift point two; 701, positioning pin; 702, locking bolt; 703, drilling positioning hole tooling profile; 704, fixing screw; 705, drill sleeve; 711, drilling positioning hole tooling reserved position one; 712, drilling positioning hole tooling reserved position two; 8, silicone flexible support connection point; 9, air guide hole; P1, gel coat layer; P2, upper surface layer; P3, structural layer; P4, lower surface layer. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] like Figures 1 to 8 As shown, the utility model provides a composite material mold, including a composite material profile 1 and a support frame, the composite material profile 1 is arranged on the upper part of the support frame, a plurality of flexible support connection points are arranged between the composite material profile 1 and the support frame, and the composite material profile 1 and the support frame are connected through the flexible support connection points;

[0028] The support frame is a metal support frame 2, which is a grid support frame structure. The metal support frame 2 includes a plurality of longitudinal grid plates 201 and a plurality of transverse grid plates 202, and the longitudinal grid plates 201 and the transverse grid plates 202 are vertically connected and fixed;

[0029] The flexible support connection point is a silicone flexible support connection point 8 , which is fixedly arranged on the top of the longitudinal grid plate 201 and the transverse grid plate 202 .

[0030] The metal support frame 2 is used as a bracket. Since the composite material profile 1 is relatively light, the metal support frame 2 can be made of 5-6 mm metal plates to reduce the overall weight of the mold; the silicone flexible support connection point 8 is mainly used to reconcile the difference in thermal expansion coefficients between the metal support frame 2 and the composite material profile 1 to maintain the stability of the size and profile accuracy of the composite material profile 1 when the composite material part is cured at high temperature. Other high-temperature resistant flexible connection methods can also be used in other embodiments.

[0031] A further optimization scheme is provided, in which four hanging points are arranged on the two opposite side walls of the metal support frame 2, namely hanging point one 501, hanging point two 502, hanging point three 503, and hanging point four 504. Hanging point one 501 and hanging point two 502 are located on the same side and are symmetrically arranged, hanging point three 503 and hanging point four 504 are located on the same side and are symmetrically arranged, and hanging point 501 and hanging point 503, hanging point 502 and hanging point 504 are symmetrically arranged; two forklift points are arranged at the bottom of the metal support frame 2, the two forklift points are respectively forklift point one 601 and forklift point two 602, and the two forklift points are symmetrically arranged.

[0032] The hanging point is a metal structure, which is convenient for the overhead crane to hang and move the mold, and the forklift point is used for forklift to move the mold.

[0033] To further optimize the solution, a circle of vacuum air guide channels 4 is set outside the net size area around the composite material surface 1. The vacuum air guide channels 4 have air guide holes 9. When the composite material is cured and formed, the vacuum air guide channels 4 can make the negative pressure evenly distributed without pressure gradient, which is more convenient for unobstructed exhaust at all positions of the entire mold.

[0034] Further optimization scheme, laser-assisted lamination positioning holes are provided on the edges of the flanging area and the arc-shaped area of ​​the composite material profile 1, two laser-assisted lamination positioning holes are provided on each side of the flanging area of ​​the composite material profile 1, wherein laser-assisted lamination positioning hole one 301 and laser-assisted lamination positioning hole two 302 are located on the same side, and laser-assisted lamination positioning hole six 306 and laser-assisted lamination positioning hole seven 307 are located on the same side; three laser-assisted lamination positioning holes are provided on each side of the arc-shaped area of ​​the composite material profile 1, wherein laser-assisted lamination positioning hole three 303, laser-assisted lamination positioning hole four 304, and laser-assisted lamination positioning hole five 305 are located on the same side, and laser-assisted lamination positioning hole eight 308, laser-assisted lamination positioning hole nine 309, and laser-assisted lamination positioning hole ten 310 are located on the same side; when laying the tooling prepreg, the laser-assisted lamination positioning holes are used in conjunction with a laser locator, which can enable the laser locator to perform precise position projection to assist subsequent workers in laying the tooling prepreg.

[0035] Two reserved positions for drilling positioning holes are set on the same side of the curved surface of the composite material profile 1, namely, the reserved position 1 for drilling positioning holes 711 and the reserved position 2 for drilling positioning holes 712. The reserved position 1 for drilling positioning holes 711 and the reserved position 2 for drilling positioning holes 712 are both used to install the drilling positioning holes tooling. The drilling positioning holes tooling is used to drill holes before demolding, which is convenient for the subsequent processing and positioning of the composite material parts. In other embodiments, the reserved position for drilling positioning holes can also be set on the opposite side of the composite material profile 1.

[0036] A further optimized solution is provided, in which the drilling positioning hole tooling includes a drilling positioning hole tooling profile 703, to which a positioning pin 701 and a locking bolt 702 are connected; the drilling positioning hole tooling profile 703 is installed to a reserved position of the drilling positioning hole tooling on the composite material profile 1 through the positioning pin 701 and the locking bolt 702; a drill sleeve 705 is provided on the drilling positioning hole tooling profile 703, and the drill sleeve 705 is installed to the drilling positioning hole tooling profile 703 through a fixing screw 704.

[0037] According to a further optimization scheme, the composite material profile 1 is a composite material multi-layer structure, and the composite material profile 1 includes a gel coat layer P1, an upper surface layer P2, a structural layer P3 and a lower surface layer P4 arranged in sequence from top to bottom; the upper surface layer P2 and the lower surface layer P4 both adopt low surface density tooling prepreg, and the structural layer P3 adopts high surface density tooling prepreg.

[0038] A method for manufacturing a composite material mold comprises the following steps:

[0039] Dehumidify the master mold and put it into the curing oven or autoclave, keeping the temperature at 65±5℃ for 60min;

[0040] Lay gel coat layer P1 and tooling prepreg layer piece by piece on the surface of the master mold, and vacuum pre-compact them at -0.06MPa to -0.08MPa for 15 to 20 minutes;

[0041] Continue to lay the remaining tooling prepreg layers on the surface of the master mold, and vacuum pre-compact after laying 2 to 3 layers of tooling prepreg layers;

[0042] After the prepreg layer of the tooling is laid on the master mold, it is packaged, pre-cured, post-cured, and demoulded after cooling, and the edge cutting process is carried out according to the required dimensional accuracy;

[0043] The obtained composite material profile 1 is connected and fixed to the supporting frame.

[0044] Further optimization scheme, the master mold is a steel-wood-resin combination structure, the master mold includes a steel structure frame, a wood layer profile, a foam layer, a wood substitute resin layer, and a rubber release cloth layer arranged in sequence; after the wood layer profile is laid on the steel structure frame, a foam layer is constructed on the surface of the wood layer profile and rough-processed, the rough-processed profile accuracy is ±3mm, and a wood substitute resin layer is laid on the surface of the foam layer after rough processing, and fine processing is performed, and the fine processing profile accuracy is ±0.2mm. A rubber release cloth is attached to the fine-processed profile to obtain a master mold for molding composite material profile 1.

[0045] To further optimize the solution, the specific operations for packaging after laying the tooling prepreg layer on the master mold are as follows:

[0046] The surface of the outermost tooling prepreg layer laid on the master mold is laid with an isolation film, a peeling cloth, a breathable felt and a vacuum bag film in sequence, and vacuum pre-compacted.

[0047] To further optimize the solution, the specific process steps of pre-curing include:

[0048] The temperature was raised from room temperature to T1 at a heating rate of 0.5-3°C / min;

[0049] Keep warm at temperature T1 for 16h~20h;

[0050] After the heat preservation is finished, the temperature is lowered, the cooling rate is ≤3℃ / min, and the can is taken out of the can below 50℃;

[0051] Among them, the value range of T1 is 60~70℃.

[0052] To further optimize the solution, the specific process steps of post-curing include:

[0053] The temperature is raised from room temperature to T2 temperature at a heating rate of 0.1-0.5°C / min;

[0054] Keep warm at T2℃ for 10min~20min;

[0055] Cooling from temperature T2 to temperature T3 at a cooling rate of 1-2°C / min;

[0056] Keep warm at T3 temperature for 6h to 12h;

[0057] After the heat preservation is finished, the temperature is lowered, the cooling rate is ≤3℃ / min, and the can is taken out of the can below 60℃;

[0058] Among them, the value range of T2 is 200-230°C, and the value range of T3 is 150-200°C.

[0059] The composite material mold provided by the utility model has a composite material profile 1 and a composite material part to be formed whose thermal expansion coefficients match each other, so that composite material parts whose dimensional accuracy and shape accuracy meet the design requirements can be manufactured, and the molded parts have small deformation, which is particularly suitable for the manufacture of large-sized composite material parts; in addition, the composite material mold is relatively light in weight, which is convenient for handling during use; and a higher heating rate can be used to complete the curing cycle of the composite material part, so as to save working hours and energy consumption, thereby reducing the manufacturing cost of the composite material part.

[0060] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A composite material mold, characterized in that: It comprises a composite material profile (1) and a support frame, wherein the composite material profile (1) is arranged on the upper part of the support frame, and a plurality of flexible support connection points are arranged between the composite material profile (1) and the support frame, and the composite material profile (1) and the support frame are connected via the flexible support connection points.

2. The composite material mold according to claim 1, characterized in that: The support frame is a metal support frame (2), the metal support frame (2) is a grid support frame structure, the metal support frame (2) comprises a plurality of longitudinal grid plates (201) and a plurality of transverse grid plates (202), the longitudinal grid plates (201) and the transverse grid plates (202) being vertically connected and fixed; The flexible support connection point is a silicone flexible support connection point (8), and the silicone flexible support connection point (8) is fixedly arranged on the top of the longitudinal grid plate (201) and the transverse grid plate (202).

3. The composite material mold according to claim 2, characterized in that: Two hanging points are arranged on the two opposite side walls of the metal support frame (2), the two hanging points on the same side are symmetrically arranged, and the hanging points on the two side walls are symmetrically arranged; two forklift points are arranged at the bottom of the metal support frame (2), and the two forklift points are symmetrically arranged.

4. The composite material mold according to claim 1, characterized in that: A vacuum air guide channel (4) is arranged outside the peripheral net size area of ​​the composite material profile (1), and a plurality of air guide holes (9) are arranged at equal intervals on the vacuum air guide channel (4).

5. The composite material mold according to claim 1, characterized in that: Laser-assisted layering positioning holes are provided on the edge of the flanged area and the edge of the arc-shaped area of ​​the composite material profile (1).

6. The composite material mold according to claim 1, characterized in that: The arc-shaped area of ​​the composite material profile (1) is provided with two reserved positions for drilling positioning holes, and the reserved positions for drilling positioning holes are used for installing drilling positioning holes.

7. The composite material mold according to claim 6, characterized in that: The drilling positioning hole tooling comprises a drilling positioning hole tooling profile (703), the drilling positioning hole tooling profile (703) is connected with a positioning pin (701) and a locking bolt (702), the drilling positioning hole tooling profile (703) is installed to the drilling positioning hole tooling reserved position on the composite material profile (1) through the positioning pin (701) and the locking bolt (702); a drill sleeve (705) is provided on the drilling positioning hole tooling profile (703), the drilling positioning hole tooling profile (703) is connected with a fixing screw (704), and the drill sleeve (705) is installed on the drilling positioning hole tooling profile (703) through the fixing screw (704).

8. The composite material mold according to claim 5, characterized in that: The composite material profile (1) is a composite material multi-layer structure, and the composite material profile (1) comprises a gel coat layer (P1), an upper surface layer (P2), a structural layer (P3) and a lower surface layer (P4) arranged in sequence from top to bottom; the upper surface layer (P2) and the lower surface layer (P4) are both low surface density tooling prepreg layers, and the structural layer (P3) is a high surface density tooling prepreg layer.

Images