Longitudinal and transverse stiffened wall plate forming device and method based on automatic fiber placement skin

Abstract

The invention discloses a device and method for forming a longitudinal and transverse stiffened wallboard based on an automatic fiber placement skin, and the method comprises the steps: firstly, preparing the automatic fiber placement skin, transferring a composite T-shaped stringer which is laid on a metal core mold in a net size and is subjected to hot pressing to a wallboard skin formed based on an automatic fiber placement process, a layer of high-temperature adhesive film is laid between the composite T-shaped stringer and the automatic fiber placement skin, the composite T-shaped stringer and the automatic fiber placement skin are fixedly held through positioning holes in a core mold, and high-temperature co-adhesive curing is carried out in an autoclave; and in addition, after a secondary part T-shaped stringer which is paved and cured out of the tank is subjected to trimming of redundant materials such as silt glue and burrs, the cured secondary dry-state ribs are positioned through a positioning clamping plate, a layer of high-temperature glue film is paved between the dry-state ribs and the automatic fiber placement skin, and then the T-shaped stringer enters the tank to be subjected to high-temperature secondary glue joint curing. By means of the metal core mold and the metal positioning clamping plate, the requirement for axis degree deviation of longitudinal and transverse ribs is effectively controlled, and high-quality forming is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material manufacturing, and in particular relates to a forming device and method for a longitudinally and transversely reinforced wall panel based on automatic wire laying skin. Background Art

[0002] In order to increase the structural strength of the composite wall panels, they are usually designed as a longitudinal and transverse reinforced structure, that is, transverse and longitudinal T-shaped long beams are evenly arranged on the inner surface of the composite wall panel skin. For example, three longitudinal T-shaped long beams are evenly arranged along the heading of the composite wall panel, and a dry T-shaped long beam with climbing on both sides is arranged with a spacing of 500mm between the longitudinal T-shaped long beams. Its design requires that the allowable deviation of the long beam axis is ±1mm. The existing technology usually adopts two sets of positioning card plates to position and glue to connect the cured T-shaped long beam to the skin. This process method is complicated to operate, requires two sets of T-shaped long beam forming molds and two sets of long beam positioners, is costly, and has a long manufacturing cycle. How to ensure the high-quality forming and fast and low-cost manufacturing of the longitudinal and transverse reinforced wall panels is a key technical problem that must be solved. Summary of the invention

[0003] Purpose of the invention: To propose a forming device and method for longitudinally and transversely reinforced wall panels based on automatic wire laying skinning, so as to solve the problems of high-quality forming and precise positioning of dry skinning of composite wall panel parts and multiple T-shaped long stringers using different forming methods during the curing process. Summary of the invention:

[0005] A forming device for longitudinally and transversely reinforced wall panels based on automatic wire laying skin, comprising: a base, a longitudinal core mold, and a transverse positioning card plate;

[0006] The base can be directly used for automatic wire laying skin, saving a set of automatic wire laying skin forming molds;

[0007] The longitudinal core mold is fixed on the base, and is used for laying longitudinal secondary parts and bonding them with the automatic wire laying skin, thereby reducing a set of long stringer positioning devices;

[0008] The transverse positioning card plate is fixed on the base, and is used to fix the transverse secondary parts and to be glued with the automatic wire laying skin to ensure the positioning accuracy of the T-shaped long stringer.

[0009] Further, the longitudinal core mold includes: a first core mold, a second core mold, a thickness pad, a height pad, a core mold connecting bolt, a core mold positioning pin and a core mold finishing bolt;

[0010] The first core mold and the second core mold have first connectors at both ends, and a molding area in the middle;

[0011] The base is provided with bolt holes and positioning pin holes, and the first connector is fixedly connected and positioned with the base through the core mold refined bolts and the core mold positioning pins;

[0012] The core mold connecting bolts fixedly connect the first core mold and the second core mold;

[0013] The thickness spacer is arranged between the first core mold and the second core mold to control the thickness of the longitudinal secondary member;

[0014] The height spacer is arranged between the first connecting head and the base to control the gap between the longitudinal secondary member and the skin.

[0015] Further, the transverse positioning card plate comprises: a card plate body, a long stringer positioner, a positioner connecting bolt, a clamping bolt, a card plate refined bolt and a card plate positioning pin;

[0016] Second connectors are provided at both ends of the card body, and the second connectors are positioned and fixed to the base through card positioning pins and card refined bolts;

[0017] The long stringer positioner is fixed to the card plate body through the positioner connecting bolts, and the positioner is provided with a clamping bolt;

[0018] The long stringer positioner-bolt assembly is fixed to the clamping plate body, and the clamping bolt and the clamping plate body together clamp and position the transverse secondary member.

[0019] Furthermore, lifting rings are provided around the base to facilitate the transportation and transfer of the device.

[0020] A forming method of a longitudinally and transversely reinforced wall panel based on automatic wire laying skinning, the steps are as follows:

[0021] Step 1: Forming the skin on the base by automatic wire laying;

[0022] Step 2: Lay the longitudinal T-shaped long stringer on the longitudinal core mold;

[0023] Step 3: Transfer the longitudinal T-shaped long stringer and the longitudinal core mold as a whole to the skin and position and fix them to the base;

[0024] Step 4: Place the base into an autoclave for the first curing;

[0025] Step 5: After the first curing is completed, remove the longitudinal core mold;

[0026] Step 6: Prepare transverse T-shaped long stringers;

[0027] Step 7: Install the transverse positioning card plate on the base, and install and position the transverse T-shaped long girder on the transverse positioning card plate;

[0028] Step 8: Place the base in the oven for a second cure.

[0029] Further, in step 2, the process of laying the longitudinal T-shaped long stringer on the longitudinal core mold is as follows:

[0030] ① Lay the prepreg layer as required in the molding area of ​​the longitudinal core mold. After laying, cut the edge margin;

[0031] ② Arrange thickness pads in the middle of both ends of the first core mold and the second core mold, and merge the first core mold and the second core mold through the core mold refined bolts;

[0032] ③ Twist the joint between the first core mold and the second core mold, then continue to lay the prepreg to the theoretical required thickness, and finally lay the film and cut the edge margin;

[0033] ④ Transfer the longitudinal core mold with completed net size paving to the base;

[0034] ⑤ Add a thickness pad between the first core mold and the second core mold, and use the core mold connecting bolts to fix them together.

[0035] ⑥ Place the base in the furnace for the first curing, the curing pressure is 0.5-0.65MPa, and the curing temperature is 180℃-200℃.

[0036] Further, in step nine, the paving and curing process of the transverse T-shaped long girders is as follows:

[0037] ① The prepreg laying layer is required to be laid on the corresponding positions of the fixed mold and the movable mold of the transverse T-shaped long stringer;

[0038] ② Place a long stringer thickness pad between the fixed mold and the movable mold, and push the movable mold to the fixed mold by the handle;

[0039] ③Twisting the transverse T-shaped long stringer between the fixed mold and the movable mold;

[0040] ④Continue to lay prepreg to the theoretical required number of layers;

[0041] ⑤ Place the pressure pad, make and seal the bag, and send it to the autoclave for curing.

[0042] Furthermore, the transverse T-shaped long stringer is positioned on the automatic fiber laying skin:

[0043] Furthermore, the second curing pressure is 0.5-0.65 MPa, and the curing temperature is 180°C-200°C.

[0044] The beneficial effects of this application are:

[0045] The present invention completes the forming of the longitudinal and transverse reinforced wall panels based on the automatic laying of the wire skin, uses the metal core mold net size laying to cooperate with the long stringer positioning card plate to realize the positioning of the longitudinal T-shaped long stringer, and uses the long stringer positioning card plate to realize the positioning of the transverse T-shaped long stringer. The present invention effectively controls the axis deviation requirements of the longitudinal and transverse ribs through the two devices of the metal core mold and the metal positioning card plate, realizes the two-stage curing forming of the co-bonding and secondary bonding of the longitudinal and transverse reinforced wall panels, and completes the high-quality forming of this type of longitudinal and transverse reinforced wall panels based on the automatic laying of the wire skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Overall layout of the vertical and horizontal reinforcement mold

[0047] Figure 2 Design structure diagram of the longitudinal secondary core mold

[0048] Figure 3 The use status diagram of the longitudinal secondary part core mold locator

[0049] Figure 4 Design structure diagram of lateral secondary positioner

[0050] Figure 5 Schematic diagram of the use of the lateral secondary positioner

[0051] Figure 6 Design structure diagram of horizontal T-shaped long girder forming die

[0052] Explanation of numbers in the figure: 1-base, 2-longitudinal core mold, 3-transverse positioning card plate, 4-lifting ring, 5-first core mold, 6-second core mold, 7-thickness pad, 8-core mold connecting bolt, 9-core mold positioning pin, 10-core mold refined bolt, 11-height pad, 12-long stringer positioning card plate positioning pin, 13-long stringer positioning card plate refined bolt, 14-long stringer positioning card plate body, 15-long stringer locator, 16-long stringer locator connecting bolt, 17-clamping bolt, 18-automatic wire laying skin, 19-transverse T-type long stringer, 20-gap pad, 21-transverse T-type long stringer forming mold base, 22-lifting ring, 23-side block, 24-fixed mold, 25-movable mold, 26-long stringer thickness pad, 27-handle, 28-movable mold movement limiting block, 29-pressure pad. DETAILED DESCRIPTION

[0053] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0054] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0055] A forming device and method for longitudinal and transverse reinforced wall panels based on automatic wire laying skins, wherein the longitudinal T-shaped long stringers after net-size laying and hot compaction on a metal core mold are transferred to the wall panel skin formed based on the automatic wire laying process, and after co-bonding, curing and trimming in an autoclave, the already cured transverse T-shaped long stringers are positioned by a positioning card, and then secondary bonding and curing are performed. The two-stage positioning, limiting and curing forming of the longitudinal long stringers and the secondary bonding of the transverse long stringers of the longitudinal and transverse reinforced wall panels are realized.

[0056] In the present invention, the wire laying wall panel forming mold, the longitudinal T-shaped long stringer core mold and the transverse T-shaped long stringer positioning card plate are all Invar structures, and the wire laying wall panel forming mold is arranged with positioning holes and bolt connection holes for connecting the long stringer core mold and the long stringer positioning card plate.

[0057] The longitudinal T-shaped long girder core mold comprises a first core mold, a second core mold, a thickness pad, a positioning pin and a refined bolt. The first core mold and the second core mold have depressions on the outside to reduce the weight. The first core mold is positioned on the wire laying wall panel through positioning holes and positioning pins and connected by refined bolts. The second core mold is connected to the fixed mold as a whole through refined bolts.

[0058] The transverse T-shaped long stringer positioner includes a long stringer positioning card plate positioning pin, a long stringer positioning card plate refined bolt, a long stringer positioning card plate body, a long stringer positioner, a long stringer positioner connecting bolt, and a clamping bolt. The long stringer positioner card plate body has a through hole for reducing weight, and a trapezoidal protrusion is set on the horizontal long stringer axis surface. The long stringer positioning card plate body is positioned on the wire laying wall panel forming mold using the positioning hole and the positioning pin, and is connected using the refined bolt. The long stringer positioner is connected to the long stringer positioner card plate body through the refined bolt. The long stringer positioner is connected to the long stringer positioning card plate body through the refined bolt.

[0059] The specific steps include preforming of T-shaped long stringers, positioning of longitudinal long stringer core molds, and positioning of transverse T-shaped long stringers.

[0060] Step 1: Preforming of T-shaped long stringers: The long stringer metal core mold and the preformed T-shaped long stringers are transferred to the clean room for standby use.

[0061] Step 2: Positioning the long stringer core mold: Use the net size to lay out on the long stringer metal core mold, then hot-compact the metal core molds, and finally transfer the hot-compacted composite T-shaped long stringer metal core mold to the siding skin formed based on the automatic wire placement process, use locating pins and locating holes to position, and finely connect and tighten with bolts, and perform high-temperature co-bonding and curing in an autoclave.

[0062] Step 1: Positioning of transverse T-shaped long beams: After the secondary parts out of the tank are trimmed of excess materials such as glue sludge and burrs, the solidified secondary dry ribs are positioned by positioning pallets, and then put into the tank for high-temperature secondary bonding and curing.

[0063] The bonding curing pressure is 0.6MPa±0.035MPa, and the curing temperature is 180℃±5℃.

[0064] like Figure 1 - Figure 6 As shown, a forming device and method for longitudinally and transversely reinforced wall panels based on automatic wire laying skins are used, in which a composite T-shaped long stringer that has been laid and hot-compacted with a net size on a metal core mold 2 is transferred to a wall panel skin 18 formed based on an automatic wire laying process, a layer of high-temperature adhesive film is laid between the composite T-shaped long stringer and the automatic wire laying skin, and then the composite T-shaped long stringer and the automatic wire laying skin are fixed through the positioning holes on the core mold, and high-temperature co-bonding and curing are carried out in an autoclave; after the transverse T-shaped long stringer 19 that has been laid and cured out of the tank is trimmed of excess materials such as sludge and burrs, the cured secondary dry ribs are positioned through the positioning clamping plate 3, and then the tank is put into a tank for high-temperature secondary bonding and curing.

[0065] In the present invention, the long stringer core mold 2 is an invar steel structure, a first core mold 5, a second core mold 6, and a positioning hole 10 and a refined bolt hole 9 for connecting the wire laying wall panel forming mold are arranged on the long stringer core mold. The long stringer core mold is provided with a thickness gasket 11 to control the thickness of the long stringer. The positioning holes and gaskets of the long stringer core mold are used together to realize the positioning of the co-glued long stringer.

[0066] The long-beam positioning clamp 3 is an invar structure, and comprises a long-beam clamp body 14 , a positioning hole 12 , a positioning pin 13 , a positioner 15 , a connecting bolt 16 , and a clamping bolt 17 .

[0067] The specific positioning steps include laying out the net size of the longitudinal long stringers, pre-positioning the longitudinal core molds, and positioning the transverse long stringers.

[0068] Step 1: Laying out the net size of the longitudinal long beam: open the core mold connecting bolts 8, divide the longitudinal core mold 2 into core mold-1 and core mold-2, clean the surface and lay out the net size. After laying, place a thickness pad 7 between the two, and then use the core mold connecting bolts 8 to connect the first core mold and the second core mold.

[0069] Step 2: Pre-positioning of the longitudinal core mold: Place a height pad 11 at the position where the base 1 is connected to the longitudinal long stringer core mold 2, transfer the longitudinal core mold 2 assembled in step 1 to the base, use the core mold locating pin 9 for positioning, and use the core mold refined bolt 10 for connection.

[0070] Step 3: Positioning the transverse long stringer: After the long stringer in step 2 is solidified, open the core mold refined bolts 10, the core mold connecting bolts 8 and the core mold positioning pins 9, remove the first core mold 5, the second core mold 6 and the height pad 11, place the transverse positioning card plate on the base, use the long stringer card plate positioning pins 12 for positioning, use the long stringer card plate refined bolts 13 for connection, and then place the transverse ribs 19 close to the long stringer locator body 14, use the tightening bolts 15 to tighten the transverse T-shaped long stringer to complete the transverse rib positioning.

[0071] Example

[0072] The main material for the longitudinal and transverse reinforced siding skin is high temperature epoxy resin carbon fiber automatic filament prepreg AC531 / CCF800H-145-35%-IIId grade. The long stringer uses high toughness high temperature curing epoxy high strength medium modulus carbon fiber prepreg AC531 / CF8611. The bonding adhesive uses J-375 high temperature resistant grade epoxy structural adhesive film. The detailed curing parameters are as follows:

[0073] Evacuate at room temperature with a vacuum degree of not less than 0.08MPa, and keep the vacuum state during the whole process; pressurize between room temperature and 80℃, with the tank pressure of 0.65Mpa±0.035Mpa; heat up to 130℃±5℃ at a rate of 0.15℃ / min~2℃ / min, and keep warm for 30min~60min; then continue to heat up to 185℃±5℃ at a rate of 0.15℃ / min~2℃ / min, and keep warm for 150min~210min; cool to below 60℃ at a rate of not more than 3℃ / min, unload the tank pressure and vacuum, and take out the product; the lowest temperature and curing time during the curing process are based on the lagging thermocouple, and the highest temperature is based on the leading thermocouple.

[0074] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present invention is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0075] Through the description of the above implementation modes, those skilled in the art can clearly understand that the above implementation modes can be implemented by means of software plus a necessary general hardware platform, and of course by means of hardware, but in many cases the former is a better implementation mode. The above describes the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above specific implementation modes, which are merely illustrative and not restrictive. Under the enlightenment of the present invention, those skilled in the art can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A forming device for longitudinally and transversely reinforced wall panels based on automatic wire laying skin, characterized in that: The device comprises: a base, a longitudinal T-shaped long stringer core mold, and a transverse T-shaped long stringer positioning clamping plate; The base is used to position the automatic wire laying skin; The longitudinal T-shaped long stringer core mold is fixed on the base, and the longitudinal T-shaped long stringer core mold is used to lay the longitudinal T-shaped long stringer and to glue it to the automatic wire laying skin; The transverse T-shaped long stringer positioning clamping plate is fixed on the base, and the transverse T-shaped long stringer positioning clamping plate is used to fix the transverse T-shaped long stringer and to be glued with the automatic wire laying skin.

2. The forming device according to claim 1, characterized in that: The longitudinal T-shaped long stringer core mold comprises: a first core mold, a second core mold, a thickness pad, a height pad, a core mold connecting bolt, a core mold positioning pin and a core mold refined bolt; The first core mold and the second core mold have first connectors at both ends, and the middle portion is a molding area; The base is provided with bolt holes and positioning pin holes, and the first connector is fixedly connected and positioned with the base through the core mold refined bolts and the core mold positioning pins; The core mold connecting bolts fixedly connect the first core mold and the second core mold; The thickness spacer is arranged between the first core mold and the second core mold to control the thickness of the longitudinal secondary member; The height spacer is arranged between the first connecting head and the base to control the gap between the longitudinal secondary member and the skin.

3. The forming device according to claim 2, characterized in that: The transverse T-shaped long-beam positioning card includes: a card body, a long-beam positioner, a positioner connecting bolt, a clamping bolt, a card refined bolt and a card positioning pin; Second connectors are provided at both ends of the card body, and the second connectors are positioned and fixed to the base through card positioning pins and card refined bolts; The long stringer positioner is fixed to the card plate body through the positioner connecting bolts, and the positioner is provided with a clamping bolt; The long stringer positioner-bolt assembly is fixed to the clamping plate body, and the clamping bolt and the clamping plate body together clamp and position the transverse T-shaped long stringer.

4. The forming device according to claim 1, characterized in that: There are hanging rings around the base.

5. A method for forming a longitudinally and transversely reinforced wall panel based on automatic fiber laying skin, the method is implemented based on any of the above claims, and the steps are as follows: Step 1: Forming the skin on the base by automatic wire laying; Step 2: Lay the longitudinal T-shaped long stringer on the longitudinal core mold; Step 3: Transfer the completed longitudinal T-shaped long stringer and longitudinal core mold to the skin as a whole and position and fix them to the base; Step 4: Place the base into an autoclave for the first curing; Step 5: After the first curing is completed, remove the longitudinal core mold and trim it; Step 6: Prepare transverse T-shaped long stringers; Step 7: Install the lateral positioning card plate on the base, and install and position the lateral secondary component on the lateral positioning card plate; Step 8: Place the base in the oven for a second cure.

6. The method according to claim 5, characterized in that: In step 2, the process of laying the longitudinal T-shaped long stringer on the longitudinal core mold is as follows: Step 1: Lay the prepreg on the molding area of ​​the longitudinal core mold according to the laying requirements. After the laying is completed, cut the edge margin; Step 2: Arrange thickness pads in the middle of both ends of the first core mold and the second core mold, and merge the first core mold and the second core mold through the core mold refined bolts; Step 3: Twist the joint between the first core mold and the second core mold, then continue to lay the prepreg to the theoretical required thickness, and finally lay the film and cut the edge margin; Step 4: Transfer the longitudinal core mold with completed net size paving to the base; Step 5: Place the base in an autoclave for the first curing.

7. The method according to claim 6, characterized in that: In step 4, the first curing pressure is 0.5-0.65 MPa, and the curing temperature is 180°C-200°C.

8. The method according to claim 7, characterized in that: Step 7: Install and position the transverse T-shaped long stringer on the transverse positioning plate. The process is as follows: Step 1: trim and deburr the solidified laid fiber skin, longitudinal T-shaped long stringer and transverse T-shaped long stringer; Step 2: Transfer the horizontal positioning card plate to the base, and position and fix the second connector to the base through the card plate positioning pin and the card plate refined bolt; Step 3: Lay the adhesive film on the joint surface between the transverse T-shaped long stringer and the skin, and then transfer the transverse T-shaped long stringer to the laid-wire skin, with the axis surface of the T-shaped long stringer close to the protruding part of the pallet body; Step 4: Fix the long stringer locator to the cardboard body through the locator connecting bolts, adjust the position of the horizontal T-shaped long stringer, place gap pads between the two ends and the longitudinal T-shaped long stringer, and tighten the clamping bolts to make the axis surface of the T-shaped long stringer close to the cardboard body; Step 5: Place the base in an autoclave for a second cure.

9. The method according to claim 8, characterized in that: Spacer blocks are placed between the two ends of the transverse T-shaped long girder and the longitudinal T-shaped long girder to control the position of the transverse T-shaped long girder.

10. The method according to claim 9, characterized in that: In step five, the second curing pressure is 0.5-0.65 MPa, and the curing temperature is 180°C-200°C.

Images