Composite autoclave curing molding process

Abstract

The application discloses a kind of composite autoclave curing forming processing methods, at least two laminated interval arrangement composite tooling as a group of composite tooling unit, multiple groups of composite tooling unit are arranged according to the arrangement order of tank tail-tank door-tank in the working platform in autoclave, and each group of composite tooling unit is spaced apart in the longitudinal direction of autoclave;In the multiple groups of composite tooling unit sequentially arranged along the axial direction of autoclave, any adjacent two groups of composite tooling unit are left and right staggered arrangement on the working platform relative to the center axis of autoclave.The application can well consider the cost and quality of composite curing forming while realizing the maximum utilization of space in autoclave, so as to reduce the temperature field difference at each position in autoclave, so as to have important significance in guaranteeing the processing quality and delivery cycle of aircraft parts.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite material forming, and particularly relates to a composite material autoclave curing forming treatment method. BACKGROUND

[0002] The autoclave curing forming is a processing method for manufacturing continuous fiber reinforced thermosetting composite material parts at present, and is widely used in the forming of advanced composite material structures, honeycomb sandwich structures and metal or composite material bonding structures. The composite material blank is heated and pressurized for curing forming by using the high temperature in the tank and the pressure generated by the compressed gas. The part curing forming process involves complex heat exchange, thermochemical reaction and the coupling effect of the flow field and temperature field between the tooling in the autoclave, the composite material component and the tank body.

[0003] Generally, based on the consideration of processing cost, in the composite material autoclave forming, multiple parts of composite materials with consistent curing parameters are arranged in one autoclave for simultaneous curing forming when the loading capacity of the autoclave allows. However, due to the influence of the autoclave space, the complexity of the thermal flow field distribution in the autoclave and the autoclave forming process, there is a problem of uneven temperature field distribution at each position in the tank, which causes the curing of the composite materials at different positions in the tank to be out of synchronization, resulting in difficulty in ensuring the quality of the part curing forming. Therefore, there is a problem of difficulty in balancing the forming cost and the forming quality in the autoclave curing forming of the composite material. SUMMARY

[0004] The purpose of the present application is to provide a composite material autoclave curing forming treatment method to solve the problem of difficulty in balancing the forming cost and the forming quality in the autoclave curing forming.

[0005] The present application is realized by the following technical solutions:

[0006] The composite material autoclave curing forming treatment method uses at least two groups of composite material tooling units arranged at intervals to set multiple groups of composite material tooling units on the working platform in the autoclave according to the arrangement order of the tank tail, the tank door and the tank, and the groups of composite material tooling units are arranged at intervals in the longitudinal direction of the autoclave.

[0007] In the multiple groups of composite material tooling units arranged in the axial direction of the autoclave, any two adjacent groups of composite material tooling units are arranged in a left-right staggered manner on the working platform relative to the center axis of the autoclave.

[0008] In some embodiments, the distance between the group of composite tooling units arranged near the tail of the tank and the effective working end surface of the tail of the tank is 0.3-0.5m, the distance between the group of composite tooling units arranged near the door of the tank and the effective working end surface of the door of the tank is 0.8-1m, and the distance between the group or groups of composite tooling units arranged in the middle of the autoclave and the other groups of composite tooling units is not less than 0.3m.

[0009] In some embodiments, the groups of composite tooling units other than the group arranged near the tail of the tank are arranged to be higher than the group arranged near the tail of the tank.

[0010] In some embodiments, the groups of composite tooling units are arranged near the side edges of the working platform in the transverse direction.

[0011] In some embodiments, the composite tooling units with smaller parts are arranged in the lowermost layer of each group of composite tooling units, and the composite tooling units with larger parts are arranged in the uppermost layer of each group of composite tooling units.

[0012] In some embodiments, the in-furnace composite tooling units are arranged on one side of the group of composite tooling units arranged near the tail of the tank.

[0013] In some embodiments, the adjacent composite tooling units in each group of composite tooling units are supported by a plurality of supporting legs.

[0014] In some embodiments, clamping members are arranged on both sides of the composite tooling units, and the supporting legs are inserted into and clamped between the clamping members.

[0015] In some embodiments, the size of the autoclave used is Φ4m*12m, the size of the working platform in the autoclave is 12m*2m, and the size of the composite tooling units is 3m*1.3m*0.35m.

[0016] Each composite tooling unit comprises three layers of composite toolings arranged in a stack, each layer of composite toolings is arranged with a spacing of 500-600mm, and three composite tooling units are arranged in the autoclave in the order of tank tail-tank door-tank, wherein the two composite tooling units arranged near the tank tail and the tank door are arranged on the same side of the working platform, and the composite tooling unit arranged at the middle position of the autoclave is arranged on the other side of the working platform, the spacing between the composite tooling unit arranged near the tank tail and the effective working end face of the tank tail is 0.3m, the spacing between the composite tooling unit arranged near the tank door and the effective working end face of the tank door is 0.8-1m, and the spacing between the composite tooling unit arranged at the middle position of the autoclave and the composite tooling unit arranged near the tank door is 0.3m.

[0017] In some embodiments, the composite tooling units arranged near the tank door and at the middle position of the autoclave are arranged with a 10mm high pad.

[0018] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0019] The present application optimizes the composite tooling, the arrangement structure and arrangement mode of the composite tooling in the autoclave, maximizes the utilization of the space in the autoclave, forms a stable flow field in the autoclave by the arrangement structure of the composite tooling unit, reduces the temperature field difference at each position in the autoclave, and thus can well balance the cost and quality of the composite material curing forming, which is of great significance to ensure the processing quality and delivery cycle of the aircraft parts. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 It is a schematic diagram of the autoclave curing forming principle.

[0022] Figure 2 It is a schematic diagram of the arrangement structure of the composite tooling unit in the embodiments of the present application.

[0023] Figure 3 It is a front view of the structure of the clamping piece in the embodiments of the present application.

[0024] Figure 4 It is a top view of the structure of the clamping piece in the embodiments of the present application.

[0025] Figure 5 Support leg structure schematic diagram in the embodiment of the present application.

[0026] Wherein:

[0027] 1, autoclave, 2, work platform, 3, composite material tooling unit, 301, composite material tooling, 4, support leg, 5, clamping piece, 501, bayonet, 6, with the furnace composite material tooling. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiment of the present application more clear, the technical scheme in the embodiment of the present application will be described clearly and completely below with reference to the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all.

[0029] Reference Figure 1 In the autoclave curing forming, the heating of the autoclave 1 is realized by releasing hot nitrogen gas from the tank door to the tank. In the actual heating process, the flow of nitrogen gas in the tank will be greatly affected by the shielding of the composite material tooling arranged in the tank, the size of the composite material tooling itself and other factors, resulting in a large temperature difference at different positions in the autoclave.

[0030] Generally, in the autoclave curing forming process, the composite material curing process usually has certain requirements for the heating / cooling rate and holding time. For example, the curing process of a certain composite material requires constant temperature curing at 180±5℃ for 120-240min, and the heating / cooling rate is required to be 0.5-2.5℃ / min. Due to the non-uniform temperature field in the autoclave, the temperature of the composite material tooling at some positions may rise to the curing temperature, but the temperature at some positions may not reach the curing temperature, which makes the curing time of some parts in the same batch of curing treatment too long, and the curing time of some parts is insufficient, making it difficult to ensure the curing forming quality of the parts in the same batch.

[0031] At present, in order to solve this problem, test or simulation calculation is used to analyze the temperature field distribution at different positions in the tank. However, due to the heating mode in the autoclave curing forming, the number, position and size of the different composite material tooling arranged in the tank will greatly affect the distribution of the temperature field in the tank, which causes great difficulty in test and simulation analysis, and it is difficult to effectively apply in the autoclave forming curing process.

[0032] Based on these problems existing in autoclave curing and molding, the present invention optimizes the composite material tooling, the layout structure and layout method of the composite material tooling in the autoclave, and proposes a curing and molding processing method that can be widely applied to composite material autoclave curing and molding, which effectively solves the problem of balancing curing and molding cost and curing and molding quality.

[0033] In one embodiment, a plurality of composite tooling units 301 are stacked and spaced apart to form a group of composite tooling units 3. When the curing molding process is performed in the autoclave, the plurality of composite tooling units 3 are arranged on the working platform in the autoclave in the order of the tank tail - tank door - tank center. Taking three groups of composite tooling units as an example, one group of composite tooling units is arranged near the tank tail, one group of composite tooling units is arranged near the tank door, and one group of composite tooling units is arranged in the middle of the autoclave; if two groups of composite tooling units are arranged, one group is arranged near the tank tail, and the other group is arranged near the tank door; if only one group of composite tooling units is arranged, the group of composite tooling units is arranged near the tank tail.

[0034] When arranging each group of composite material tooling units, each group of composite material tooling units is spaced apart along the longitudinal direction of the autoclave. In this embodiment, along the longitudinal direction of the autoclave, the spacing between a group of composite material tooling units located near the tail of the autoclave and the effective working end surface of the tail of the autoclave is set to 0.3-0.5m, referring to Figure 1 The effective working end surface of the tank tail here refers to the vertical plane where the working platform is close to the end of the tank tail; the distance between a group of composite material tooling units arranged near the tank door and the effective working end surface of the tank door is 0.8-1m. Similarly, the effective working end surface of the tank door here refers to the vertical plane where the working platform is close to the end of the tank door; then, one or more groups of composite material tooling units arranged in the middle of the autoclave are arranged in sequence with a distance of not less than 0.3m between them and other groups of composite material tooling units.

[0035] In order to further improve the flow field and temperature field distribution in the autoclave, among the multiple sets of composite material working units arranged in sequence along the axial direction of the autoclave, the adjacent two sets of composite material tooling units are arranged in a left-right staggered arrangement relative to the central axis of the autoclave on the working platform. Figure 2 Along the longitudinal direction of the autoclave, one group of composite material tooling units 3 is arranged on the left side of the working platform 2, and another adjacent group of composite material tooling units 3 is arranged on the right side of the working platform 2. The third group of composite material tooling units 3 is arranged on the left side of the working platform 2, and they are staggered on both sides of the working platform in the same direction.

[0036] At this time, in order to further optimize the influence of the setting of each group of composite tooling units on the airflow flow field in the autoclave, each group of composite tooling units 3 is arranged close to the side edge of the working platform.

[0037] In this embodiment, along the direction of the heating airflow, each group of composite tooling units except the one arranged close to the tail of the autoclave is arranged to be higher than the one arranged close to the tail of the autoclave, so as to reduce the temperature field difference at each position in the autoclave.

[0038] In an embodiment, in each group of composite tooling units, the composite tooling with a smaller part size is arranged in the lowermost layer in the unit, and the composite tooling with a larger part size is arranged in the uppermost layer in the unit.

[0039] When there are in-furnace composite toolings that need to be processed in the same batch, the in-furnace composite tooling 6 is arranged on one side of the group of composite tooling units close to the tail of the autoclave.

[0040] The composite material autoclave curing forming method of the present application will be described below with reference to the commonly used autoclave equipment in composite material autoclave curing forming.

[0041] In this embodiment, the size of the autoclave is Φ4m*12m, and the size of the working platform arranged in the autoclave is 12m*2m.

[0042] In order to fully utilize the space in the autoclave, to be able to arrange as many composite toolings as possible in the autoclave, and to reduce the temperature field difference at each position in the autoclave, and in combination with the size of the composite material, the size of the composite tooling is set to 3m*1.3m*0.35m.

[0043] A clamping piece 5 is arranged on each side of the composite tooling 301, and the structure of the clamping piece is shown in Figure 3 and 4 In each group of composite tooling units, four support legs 4 are arranged between each layer of composite tooling, so that each layer of composite tooling is arranged with a spacing of 500mm; wherein the two ends of the support leg 4 are respectively inserted into the clamping opening 501 of the clamping piece 5 and clamped between the clamping piece, and the composite tooling is horizontally fixed and supported by the four support legs 4, and the structure of the support leg is shown in Figure 5 .

[0044] The composite tool units arranged in the connecting mode can realize multi-layer arrangement of the composite tools, reduce the influence between the stacked composite tools, and reduce the disturbance and influence on the airflow, so that the flow field in the autoclave can maintain good stability.

[0045] Each group of composite tool units includes three composite tools stacked and spaced apart, and the adjacent two layers of composite tools are supported and arranged by the support legs.

[0046] As Figure 2 Three groups of composite tool units 3 are arranged in the autoclave 1, one group of composite tool units is arranged near the tail of the autoclave, one group of composite tool units is arranged near the door of the autoclave, and the other group of composite tool units is arranged in the middle of the autoclave. Specifically, the distance between the composite tool unit arranged near the tail of the autoclave and the effective working end face of the tail of the autoclave is 0.3m, the distance between the composite tool unit arranged near the door of the autoclave and the effective working end face of the door of the autoclave is 0.8m, and the distance between the composite tool unit arranged in the middle of the autoclave and the composite tool unit arranged near the door of the autoclave is 0.3m.

[0047] Along the autoclave axis direction, among the three groups of composite tool units 3 arranged in sequence, the first group of composite tool units is arranged on the left side of the working platform and close to the side edge of the working platform, the second group of composite tool units is arranged on the right side of the working platform and close to the side edge of the working platform, and the third group of composite tool units is arranged on the left side of the working platform and close to the side edge of the working platform.

[0048] The composite tool units arranged near the door of the autoclave and arranged in the middle of the autoclave are arranged in a high position by using a 10mm high cushion block, so that the arrangement position of these two groups of composite tool units on the working platform is higher than the height of the composite tool unit arranged at the tail of the autoclave.

[0049] By using this arrangement mode, the space in the autoclave can be maximized, and based on the arrangement structure of the composite tool units, a stable flow field can be formed in the autoclave by cooperating with the airflow heating mode of the autoclave, the temperature field difference at each position in the autoclave is reduced, so that the cost and quality of the composite material curing forming can be well considered, which is of great significance to ensure the quality and delivery cycle of the aircraft parts.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "horizontal", "vertical" and the like in the description of the present application do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiments falls within the scope of protection of the present application.

Claims

1. A composite material autoclave curing molding method, characterized in that: At least two stacked composite tooling units are set as a group of composite tooling units. Multiple groups of composite tooling units are arranged on the working platform in the autoclave in the order of tank tail - tank door - tank center. The groups of composite tooling units are spaced apart in the longitudinal direction of the autoclave. Among the multiple groups of composite material tooling units arranged in sequence along the axial direction of the autoclave, any two adjacent groups of composite material tooling units are arranged in a left-right staggered arrangement on the work platform relative to the central axis of the autoclave.

2. The composite material autoclave curing molding method according to claim 1, characterized in that: The distance between a group of composite material tooling units located near the tail of the tank and the effective working end surface of the tank tail is 0.3-0.5m, the distance between a group of composite material tooling units located near the tank door and the effective working end surface of the tank door is 0.8-1m, and one or more groups of composite material tooling units located in the middle of the autoclave are arranged in sequence with a distance of not less than 0.3m between them and other groups of composite material tooling units.

3. The composite material autoclave curing molding method according to claim 1, characterized in that: The other groups of composite material tooling units except the one set near the tail of the tank are raised so that their setting height on the work platform is higher than the height of the one group of composite material tooling units set at the tail of the tank.

4. The composite material autoclave curing molding method according to claim 1, characterized in that: Each group of composite material tooling units is respectively arranged close to the side edge of the work platform in the transverse direction.

5. The composite material autoclave curing molding method according to claim 1, characterized in that: In each group of composite tooling units, composite tooling with smaller parts is arranged at the bottom layer of the group of composite tooling units, and composite tooling with larger parts is arranged at the top layer of the group of composite tooling units.

6. The composite material autoclave curing molding method according to claim 1, characterized in that: The furnace composite material tooling is set on one side of a group of composite material tooling units near the tail of the tank.

7. The composite material autoclave curing molding method according to claim 1, characterized in that: In each group of composite material tooling units, adjacent composite material tooling units are supported by a plurality of supporting legs.

8. The composite material autoclave curing molding method according to claim 7, characterized in that: Snap-fitting parts are respectively provided on both sides of the composite material tooling, and the ends of the supporting legs are respectively inserted into the snap-fitting parts and snap-connected with each other.

9. The composite material autoclave curing molding method according to claim 1, characterized in that: The size of the autoclave used is Φ4m*12m, the size of the working platform inside the autoclave is 12m*2m, and the size of the composite material tooling is set to 3m*1.3m*0.35m; Each group of composite material tooling units includes three stacked and spaced composite material toolings, with each layer of composite material tooling spaced 500-600mm apart. Three groups of composite material tooling units are arranged in the autoclave in the order of tank tail - tank door - tank center. Among them, the two groups of composite material tooling units arranged near the tank tail and the tank door are respectively arranged on the same side of the working platform, and a group of composite material tooling units arranged in the middle of the autoclave is arranged on the other side of the working platform. The distance between a group of composite material tooling units arranged near the tank tail and the effective working end face of the tank tail is 0.3m, the distance between a group of composite material tooling units arranged near the tank door and the effective working end face of the tank door is 0.8-1m, and the distance between a group of composite material tooling units arranged in the middle of the autoclave and a group of composite material tooling units arranged near the tank door is 0.3m.

10. The composite material autoclave curing molding method according to claim 9, characterized in that: The composite material tooling units located near the tank door and in the middle of the autoclave are respectively elevated with 10mm high pads.

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