Molding and bending control method and molding device for thermoplastic composite material L-shaped structural member

Abstract

The invention discloses a thermoplastic composite material L-shaped structural part forming and bending control method and a forming device. The control method comprises the steps that S1, blanking is conducted, specifically, a prefabricated laminated flat plate made of a thermoplastic composite material is prefabricated; s2, mounting and feeding are conducted, specifically, the prefabricated laminated flat plate is mounted on a material frame through an elastic connecting structure; s3, heating the material: transferring the material frame into a heating oven for heating; s4, transfer limiting is conducted, specifically, the material frame is transferred to a preset position on the mold, and the material frame is limited and locked through a positioning mechanism; s5, ballasting and fixing, wherein the material frame is controlled to be in a horizontal and stable bending axis state through a ballasting mechanism; and S6, jacking and bending are conducted, specifically, a jacking rod mechanism drives the flanging area of the material frame to be turned over so that the prefabricated laminated flat plate can be bent. Through the arrangement, the problem that interlayer slippage is inaccurate due to the fact that the prefabricated laminated flat plate is shrunk and inclined and cannot be tightly attached to the molded surface of the mold during pressurizing and mold closing can be solved, and the yield and the finished product quality of the L-shaped structural part are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material manufacturing technology, and in particular relates to a forming and bending control method and a forming device for an L-shaped structure of a thermoplastic composite material. Background Art

[0002] Thermoplastic composite materials have been rapidly developed and applied in the aviation industry due to their outstanding advantages such as excellent impact toughness, short molding cycle, high production efficiency and weldability. The L-shaped structure of thermoplastic composite materials can be widely used in aircraft structures.

[0003] At present, a method for controlling the bending of thermoplastic composite L-shaped structural parts is to use a hot compression molding method, that is, first, the prefabricated laminated plate is installed on the material frame through an elastic structure, and then the material frame is manually pushed to transfer to the oven for heating, and finally the heated prefabricated laminated plate is transferred to the mold for pressurized mold forming. In the above-mentioned molding bending control method, the material frame is a structural part that does not produce bending deformation. This makes it easy to cause the elastic structure on the material frame to break during the pressurized mold closing process if the bending size of the L-shaped structural part is slightly large, thereby causing the prefabricated laminated plate to tighten at this location, resulting in defects. In addition, the above-mentioned control method lacks positioning and stability control of the material frame before the prefabricated laminated plate is pressurized and closed, resulting in the inability of the resin matrix with a higher viscosity to accurately adhere to and remain on the mold surface, and also causing the problem of inaccurate interlayer slippage, which in turn causes the product yield to be poor and the finished product quality to be unstable.

[0004] Based on the above, there is an urgent need for a method and device for controlling the forming and bending of thermoplastic composite L-shaped structural parts to solve the technical problems existing in the prior art. Summary of the Invention

[0005] One of the objectives of the present invention is to provide a method for controlling the bending of thermoplastic composite L-shaped structural parts. This method ensures that prefabricated laminated plates can be accurately adhered to and maintained on the tooling surface, solves the problem of inaccurate slippage between the prefabricated laminated plates, and improves the control of their extension direction, thereby improving the production efficiency, stability and quality of the product.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A method for controlling the forming and bending of an L-shaped thermoplastic composite structural member comprises the following steps:

[0008] S1, blanking, pre-preparing a prefabricated laminated flat plate made of thermoplastic composite material;

[0009] S2. Mounting and loading: Mount the prefabricated laminated flat plate on the material frame through the elastic connection structure;

[0010] S3. Material heating: Transfer the above-mentioned material frame to a heating oven and heat it to a preset temperature.

[0011] S4. Transfer and positioning: Transfer the heated above-mentioned material frame to a predetermined position on the mold, and limit and lock the above-mentioned material frame through a positioning mechanism.

[0012] S5. Ballast fixation: Control the above-mentioned material frame to be in a horizontal and stable bending axis state through a ballast mechanism.

[0013] S6. Top pressure and bending: The ejector rod mechanism drives the flanging area of the above-mentioned material frame to fold, so that the above-mentioned material frame drives the above-mentioned prefabricated laminated flat plate to bend.

[0014] Optionally, step S5 includes:

[0015] S51. The above-mentioned ballast mechanism contacts the bending axis of the above-mentioned material frame.

[0016] S52. The above-mentioned ejector rod mechanism contacts the flanging area of the above-mentioned material frame.

[0017] Optionally, in step S6, when the above-mentioned material frame folds, the above-mentioned material frame continuously remains in a restored pre-tightened state.

[0018] Optionally, after step S6, the following steps are further included:

[0019] S7. Mold closing and forming: After the above-mentioned material frame folds in place, the mold closes and maintains for a preset time.

[0020] S8. Demolding treatment.

[0021] Another object of the present invention is to provide a forming device, which can improve the production efficiency, stability and quality of products based on the above-mentioned forming and bending control method of the thermoplastic composite L-shaped structural member.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] A forming device, based on the above-mentioned forming and bending control method of the thermoplastic composite L-shaped structural member, includes: a mold and a positioning mechanism, a ballast mechanism and an ejector rod mechanism installed on the above-mentioned mold. The above-mentioned positioning mechanism is used to limit and lock the heated above-mentioned material frame. The above-mentioned ballast mechanism is used to control the above-mentioned material frame to be in a horizontal and stable bending axis state. The above-mentioned ejector rod mechanism can fit and contact and drive the flanging area of the above-mentioned material frame to fold.

[0024] Optionally, it further includes a slide rail mechanism. The above-mentioned slide rail mechanism is located between the above-mentioned heating oven and the above-mentioned mold and is used to push the heated above-mentioned material frame into the above-mentioned mold.

[0025] Optionally, the above positioning mechanism includes a base, a positioning stop block, and a positioning rod, and the above material frame includes a first frame plate and a second frame plate, where:

[0026] The above base is horizontally fixed to the above mold;

[0027] The above positioning stop block is vertically fixed to the above base, and a positioning groove is provided vertically. The positioning groove includes a first side wall and a second side wall. The first side wall is closer to the above slide rail mechanism than the second side wall, and the horizontal height of the first side wall is lower than that of the second side wall;

[0028] The above first frame plate and the above second frame plate are hinged through the above positioning rod. When the above slide rail mechanism pushes the above material frame so that the above positioning rod fits and contacts the second side wall, the above positioning rod can fall into the above positioning groove.

[0029] Optionally, the above positioning mechanism further includes a positioning baffle and a first elastic member, where:

[0030] The above positioning baffle is rotatably connected to one side of the above positioning stop block;

[0031] Both ends of the above first elastic member are respectively fixed to one end of the above positioning baffle and the above positioning stop block. When the above first elastic member is in a restored state, the above positioning baffle is inclined, and the other end of the above positioning baffle has an inclined surface, and the inclined surface is flush with the inner wall surface of the first side wall;

[0032] The above positioning rod can push the above positioning baffle to rotate, and when the above slide rail mechanism pushes the above material frame to the above predetermined position and withdraws the above slide rail mechanism, the above inclined surface can be limited to abut against the above positioning rod so that the above positioning rod falls vertically into the above positioning groove.

[0033] Optionally, the above positioning mechanism further includes a first support platform and a second support platform. The first support platform is fixed to the above positioning rod, and the second support platform is set at a preset height. When the above positioning rod falls into the above positioning groove, the above first support platform fits and abuts against the above second support platform.

[0034] Optionally, the above ballast mechanism includes a structural frame and a ballast block. The structural frame is installed on the above mold, the ballast block is arranged on the above structural frame, and when the above ejector rod mechanism drives the flanging area of the above material frame to fold, the above ballast block fits and abuts against the above first support platform.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] The present invention provides a method for controlling the forming and bending of a thermoplastic composite material L-shaped structural member. This control method enables the prefabricated laminated flat plate to be quickly and efficiently transferred and positioned to a predetermined position in the mold first, and then the prefabricated laminated flat plate is kept horizontal and in a stable bending axis state before folding through a ballast mechanism, preventing the prefabricated laminated flat plate from tilting and causing fiber pattern disorders. Finally, the material frame is folded through a push rod mechanism, which can not only effectively avoid the fracture of the elastic connection structure, but also ensure that the prefabricated laminated flat plate can accurately adhere to and remain on the mold surface during the mold closing process, thereby preventing inaccurate interlayer slippage and wrinkling of the prefabricated laminated flat plate during the bending process, effectively realizing the control of the extension direction of the prefabricated laminated flat plate, greatly reducing the defect rate of the L-shaped structural member during the bending and forming process, and significantly improving its yield and finished product quality.

[0037] The present invention also provides a forming device. Based on the above-mentioned method for controlling the forming and bending of a thermoplastic composite material L-shaped structural member, it can effectively solve the problems of shrinkage of the prefabricated laminated flat plate, tilting of the prefabricated laminated flat plate in the left and right directions, and the inability of the prefabricated laminated flat plate to closely adhere to the mold surface during pressure mold closing, thereby significantly improving the yield and finished product quality of the L-shaped structural member. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic flow chart of the method for controlling the forming and bending of a thermoplastic composite material L-shaped structural member provided by an embodiment of the present invention;

[0039] Figure 2 It is a schematic structural diagram of the forming device provided by an embodiment of the present invention;

[0040] Figure 3 It is a partial structural diagram of the forming device provided by an embodiment of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the material frame provided by an embodiment of the present invention;

[0042] Figure 5 It is a schematic structural diagram of the material frame after being pushed into the mold provided by an embodiment of the present invention;

[0043] Figure 6 It is a partial structural diagram of the first elastic member in an extended state provided by an embodiment of the present invention;

[0044] Figure 7 It is a partial structural diagram of the first elastic member in a restored state provided by an embodiment of the present invention;

[0045] Figure 8Schematic diagram of the ballast mechanism and the ejector rod mechanism provided by the embodiment of the present invention assembled on the second horizontal substrate;

[0046] Figure 9 Schematic diagram of the structure of the material frame provided by the embodiment of the present invention after folding.

[0047] In the figure:

[0048] 100. Material frame; 101. Hanging ring; 102. First frame plate; 103. Second frame plate; 104. Connecting hole; 105. Third elastic member; 200. Elastic connection structure; 300. Hot press plate;

[0049] 11. Upper mold; 111. Second horizontal substrate; 12. Lower mold; 121. Convex tooling surface; 122. First horizontal substrate;

[0050] 2. Slide rail mechanism; 21. Guide rail; 22. Conveyor frame; 221. Hook;

[0051] 3. Positioning mechanism; 31. Base; 32. Positioning stop block; 321. Positioning groove; 3211. First side wall; 3212. Second side wall; 322. Optical screw rod; 33. Positioning rod; 34. Support block; 35. Buffer member; 36. First support platform; 37. Second support platform; 38. Positioning baffle; 39. First elastic member;

[0052] 4. Ballast mechanism; 41. Structure frame; 411. Slideway; 42. Ballast block; 43. Second elastic member; 44. Slide block;

[0053] 5. Ejector rod mechanism; 51. Push rod; 52. Rolling wheel. Detailed implementation manners

[0054] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0055] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0056] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0057] The technical solution provided by the present invention is described below with reference to the accompanying drawings and specific embodiments.

[0058] In response to the problems existing in the current method of bending and forming thermoplastic composite L-shaped structural members (hereinafter referred to as L-shaped structural members), this embodiment provides a forming device that can solve the defects in the prior art, such as the elastic connection structure 200 on the material frame 100 being easily broken when the bending size of the L-shaped structural member is slightly larger, and the lack of positioning and stability control of the material frame 100, which leads to product defects, poor yield, and unstable finished product quality.

[0059] Specifically, combined Figures 2 to 3 As shown, the molding device includes a mold, a slide rail mechanism 2, a positioning mechanism 3, a pressing mechanism 4 and a push rod mechanism 5.

[0060] The mold comprises an upper mold 11 and a lower mold 12. In this embodiment, the lower mold 12 is a fixedly mounted male mold (i.e., having a raised mold surface 121 with the same cross-sectional shape as the L-shaped structural member), while the upper mold 11 is a female mold (i.e., having an inner cavity with the same cross-sectional shape as the L-shaped structural member) that is transmission-connected to the hot press plate 300 and can move up and down relative to the lower mold 12. When the upper mold 11 and the lower mold 12 are closed, the prefabricated laminated flat plate can be bent into the desired L-shaped structural member.

[0061] The slide rail mechanism 2 is located between the heating oven (not shown) and the mold, and is capable of pushing the heated material frame 100 containing the prefabricated laminated flat sheet into the mold. For example, in this embodiment, the slide rail mechanism 2 includes a guide rail 21 and a conveyor rack 22. The guide rail 21 is fixedly mounted between the heating oven and the lower mold 12, and the conveyor rack 22 is slidably mounted on the guide rail 21. A hook 221 is provided at the bottom of the conveyor rack 22. Accordingly, as shown in FIG.Figure 4 , Figure 5 As shown in Figure 5 , a hanging ring 101 is provided at the top of the material frame 100. Workers can hang the material frame 100 carrying the prefabricated laminated flat plate on the conveyor rack 22 through the hanging ring 101, and then push the material frame 100 into the heating oven semi-automatically for heating. After a period of time, the heated material frame 100 is quickly pushed to a predetermined position in the mold manually. Through the above-mentioned slide rail mechanism 2, the semi-automatic transfer and positioning of the prefabricated laminated flat plate can be realized, thus realizing a simple and efficient positioning process.

[0062] The positioning mechanism 3 is arranged on the lower mold 12, which can limit and lock the material frame 100 at a predetermined position between the lower mold 12 and the upper mold 11, thus realizing the positioning of the material frame 100. The ballast mechanism 4 is fixedly arranged on the upper mold 11. After the material frame 100 is limited and locked, and before the pressure is applied for clamping the mold, the ballast mechanism 4 can descend along with the upper mold 11 in the direction close to the lower mold 12 to stably control the material frame 100 in a horizontal and stable bending axis state, so as to achieve the purpose of controlling the stability of the material frame 100 and ensure the uniformity of the fiber texture of the prefabricated laminated flat plate. The ejector rod mechanism 5 is fixedly arranged on the upper mold 11. When the material frame 100 is in a horizontal and stable bending axis state, the ejector rod mechanism 5 can drive the flanging area of the material frame 100 to fold, so that the material frame 100 drives the prefabricated laminated flat plate to bend. Compared with the material frame 100 that does not fold in the prior art, it can reduce the obstruction in the bending and forming process of the prefabricated laminated flat plate, not only avoid the elastic connection structure 200 from being stretched too long and breaking, but also make the prefabricated laminated flat plate closely fit and remain on the convex tooling surface 121 of the lower mold 12.

[0063] Through the above settings of the positioning mechanism 3, the ballast mechanism 4 and the ejector rod mechanism 5, the problems that the prefabricated laminated flat plate shrinks, the prefabricated laminated flat plate tilts in the left and right directions, and the prefabricated laminated flat plate cannot closely fit on the mold surface during pressure application and mold clamping can be effectively solved, so that the forming device can effectively control the extension direction of the prefabricated laminated flat plate. At the same time, it also effectively prevents the phenomenon that the prefabricated laminated flat plate has inaccurate interlayer slip during the bending process, avoids the prefabricated laminated flat plate from generating wrinkles, and thus significantly improves the yield and quality of the L-shaped structural parts.

[0064] This embodiment also provides a control method for bending and forming an L-shaped structural part. This control method can be realized based on the above-mentioned forming device. Referring to Figure 1 As shown in Figure 1 , the control method specifically includes the following steps:

[0065] Step S1, blanking, prefabricating a prefabricated laminated flat plate made of a thermoplastic composite material;

[0066] Specifically, in this embodiment, first, thermoplastic composites commonly used in aircraft manufacturing (such as high-performance thermoplastic resin matrices, carbon fiber-reinforced polyether ketones, etc.) are prepared into prefabricated layer substrates by methods such as the prepreg method and the melting method; then, a cutting machine is used to cut the prefabricated layer substrate according to the outer dimension of the L-shaped structural member after adding margin; then, holes are drilled at the edges of the prefabricated layer substrate for the subsequent elastic connection structure 200 to pass through. Through the above processes, the required prefabricated laminated flat plate can be prepared.

[0067] Step S2: Mounting and loading. The prefabricated laminated flat plate is mounted on the material frame 100 through the elastic connection structure 200.

[0068] Specifically, in this embodiment, in combination with Figure 4 and Figure 5 As shown, the material frame 100 includes a first frame plate 102 and a second frame plate 103 that are hingedly connected. It can be understood that the first frame plate 102 and the second frame plate 103 are the flanging areas of the above-mentioned material frame 100, and a row of connection holes 104 are respectively provided on the inner side walls of the first frame plate 102 and the second frame plate 103. First, the hook 221 on the transfer rack 22 is passed through the hanging ring 101 on the material frame 100 so that the material frame 100 is mounted and fixed on the transfer rack 22. Secondly, one end of the elastic connection structure 200 such as a spring, a clip, or a drawbar is passed through the connection hole 104 to be mounted on the material frame 100. Finally, the other end of the elastic connection structure 200 is passed through the hole drilled at the edge of the prefabricated laminated flat plate (not shown in the figure), so that the prefabricated laminated flat plate is mounted on the material frame 100 through the elastic connection structure 200. It should be noted that at this time, the axis of the prefabricated laminated flat plate coincides with the axis of the material frame 100.

[0069] Step S3: Material heating. The material frame 100 is transferred to the heating oven and heated to a preset temperature.

[0070] Specifically, in this embodiment, the staff pushes the transfer rack 22 to semi-automatically push the transfer rack 22, the material frame 100, and the prefabricated laminated flat plate along the guide rail 21 into the heating oven and heat them to a preset temperature. For example, heat them to within 400 °C.

[0071] Step S4: Transfer and limit. The heated material frame 100 is transferred to a predetermined position on the mold, and the material frame 100 is limited and locked by the positioning mechanism 3.

[0072] Specifically, in this embodiment, after heating for a period of time, the staff then pushes the transfer rack 22 on the guide rail 21 out of the heating oven and quickly transfers and positions it to the predetermined position in the mold, and is limited and locked by the positioning mechanism 3 installed on the mold.

[0073] In this embodiment, referring toFigure 4 , Figure 5 As shown in Figure 5 , a set of positioning mechanisms 3 are respectively arranged at the front and rear ends of the first horizontal substrate 122 of the lower die 12 to ensure the stability of locking the material frame 100. The positioning mechanism 3 includes a base 31, a positioning stop 32 and a positioning rod 33. The base 31 is horizontally and fixedly connected to the first horizontal substrate 122 of the lower die 12; the positioning stop 32 is vertically and fixedly connected to the base 31, and a positioning groove 321 with a preset depth is vertically opened at the center position of the top of the positioning stop 32. The positioning groove 321 has a first side wall 3211 and a second side wall 3212. The first side wall 3211 is closer to the slide rail mechanism 2 than the second side wall 3212, and the horizontal height of the first side wall 3211 is lower than that of the second side wall 3212; a part of the positioning rod 33 passes through the staggered first frame plate 102 and the second frame plate 103 to realize the hinge connection between the first frame plate 102 and the second frame plate 103 through the positioning rod 33.

[0074] Through the above settings, after the staff pushes the material frame 100 over the first side wall 3211, the part of the positioning rod 33 that does not pass through the first frame plate 102 and the second frame plate 103 can be in contact with the second side wall 3212. At this time, it indicates that the material frame 100 has been pushed to the predetermined position in the die. The staff then evacuates the transfer rack 22, so that the hook 221 disengages from the hanging ring 101. After losing the support of the transfer rack 22, the entire material frame 100 falls freely, and the positioning rod 33 is inserted into the positioning groove 321 for limit, thus completing the limit locking process of the material frame 100 in the die. The entire continuous process of "removing the material frame 100 from the heating oven - pushing the material frame 100 into the die - limiting the material frame 100 in the die" is within about 5 seconds, so that a simple and efficient positioning process for the material frame 100 can be realized, and the whole process is fast, smooth and accurately positioned, which improves the production efficiency and helps to control the quality of the finished product.

[0075] Furthermore, in this embodiment, the preset depth of the positioning groove 321 is not less than 50 mm to ensure that the material frame 100 can fall to a height sufficient to make the prefabricated laminated flat plate closely adhere to the convex tooling surface 121.

[0076] Refer to Figure 3As shown, the positioning mechanism 3 provided in this embodiment further includes a support block 34 and a buffer member 35. The support block 34, the positioning stopper 32, and the base 31 can be integrally formed by casting to enhance the structural stability of the positioning mechanism 3, and an internal threaded hole is provided on the support block 34; a threaded section is provided on the outer peripheral surface of the buffer member 35 so that the buffer member 35 is assembled on the support block 34 by a threaded connection. The output shaft of the buffer member 35 can extend upward or retract downward in the vertical direction, and the horizontal height of the output shaft of the buffer member 35 when in the original position is not lower than the bottom of the positioning groove 321.

[0077] Through the above settings, when the material frame 100 falls into the positioning groove 321, it can first contact the end of the output shaft of the buffer member 35, and then finely adjust the horizontal height of the material frame 100 through the buffer member 35, so that the bottom surface of the prefabricated laminated flat plate just contacts the top of the convex tooling surface 121, thereby additionally increasing the support fulcrum for the prefabricated laminated flat plate and further ensuring that the prefabricated laminated flat plate can be in a horizontal and stable state before pressure molding.

[0078] In this embodiment, in combination with Figure 4 , Figure 5 As shown, the positioning mechanism 3 further includes a first support platform 36 and a second support platform 37. The first support platform 36 is fixedly connected to the part of the positioning rod 33 passing through the first frame plate 102 and the second frame plate 103, and the second support platform 37 is fixedly connected to the output end of the buffer member 35, so that before the material frame 100 is pushed into the mold, the output end of the buffer member 35 can drive the second support platform 37 to lift to the required preset height. This preset height can be flush with the top of the convex tooling surface 121 or slightly higher than the top of the convex tooling surface 121, and this embodiment does not limit this. In short, after the material frame 100 falls to make the first support platform 36 and the second support platform 37 fit and abut, the material frame 100 can be further supported to keep it in a horizontal and stable state. At the same time, it can be ensured through the adjustment of the buffer member 35 that the top of the convex tooling surface 121 will not cause extrusion damage to the prefabricated laminated flat plate, and the prefabricated laminated flat plate is at a height that can closely adhere to the convex tooling surface 121.

[0079] Specifically, in combination with Figure 6 , Figure 7As shown, the positioning mechanism 3 provided in this embodiment further includes a positioning baffle 38 and a first elastic member 39. The positioning baffle 38 is rotatably connected to the positioning block 32 through a smooth screw 322 provided on the first side wall 3211. Two ends of the first elastic member 39 (such as a tension spring) are respectively fixedly connected to one end of the positioning baffle 38 and the positioning block 32. When the first elastic member 39 is in a restored state, the positioning baffle 38 is in an inclined state at this time, and the other end of the positioning baffle 38 has an inclined surface, which is flush with the inner wall surface of the first side wall 3211 at this time.

[0080] During the process that the material frame 100 crosses the first side wall 3211, the positioning rod 33 will first contact the other end of the positioning baffle 38 and push the inclined positioning baffle 38 flat. At this time, one end of the positioning baffle 38 is lifted upward, so that the first elastic member 39 elongates and has an elastic pre-tightening force. After the material frame 100 crosses the first side wall 3211, the first elastic member 39 is restored, so that the positioning baffle 38 is restored and is in an inclined state again. When withdrawing the conveying rack 22, the inclined surface on the positioning baffle 38 can limit the position of the positioning rod 33, so that the positioning rod 33 continuously stays at a position corresponding to the positioning groove 321, that is, directly above the positioning groove 321. After the hook 221 disengages from the hanging ring 101, the material frame 100 can directly and freely fall into the positioning groove 321. In this way, it can be ensured that the positioning rod 33 is always in a position opposite to the positioning groove 321 during the process of withdrawing the conveying rack 22, avoiding the situation of deviation of the positioning rod 33 and improving the installation efficiency of the material frame 100.

[0081] Step S5, ballast fixation, controlling the material frame 100 to be in a horizontal and stable bending axis state through the ballast mechanism 4;

[0082] Specifically in this embodiment, referring to Figure 8 As shown, a set of ballast mechanisms 4 are also respectively provided at the front and rear ends of the second horizontal substrate 111 of the upper mold 11. The ballast mechanism 4 includes a structural frame 41 and a ballast block 42. The structural frame 41 is fixedly installed on the second horizontal substrate 111, and the ballast block 42 is connected to the structural frame 41. When the ejector rod mechanism 5 drives the first frame plate 102 and the second frame plate 103 to fold, the ballast block 42 can be attached and abutted against the first support platform 36 to stabilize the bending axis of the material frame 100 through the ballast block 42, preventing the material frame 100 from tilting and shifting during the folding process, effectively realizing the control of the extension direction of the prefabricated laminated flat plate, and helping to improve the quality and stability of the product.

[0083] It should be noted that in step S5, it is necessary to ensure that the ballast mechanism 4 first contacts the bending axis of the material frame 100, and then the ejector rod mechanism 5 contacts the first frame plate 102 and the second frame plate 103, so as to ensure that the material frame 100 is in a horizontal stable state before the ejector rod mechanism 5 drives the material frame 100 to fold.

[0084] To achieve this purpose, in this embodiment, continue to refer to Figure 8 As shown, the ballast mechanism 4 further includes a second elastic member 43 and a slider 44. The second elastic member 43 is arranged vertically, one end of which is fixedly connected to the ballast block 42, and the other end is fixedly connected to the structure frame 41. A slideway 411 is vertically formed on the structure frame 41, and the slider 44 is slidably arranged on the slideway 411 and fixedly connected to the ballast block 42. In addition, in this embodiment, the ejector rod mechanism 5 is also fixedly installed on the second horizontal substrate 111 of the upper mold 11 and extends vertically downward.

[0085] When the second elastic member 43 is in its original state, the horizontal height of the ballast block 42 is lower than the horizontal height of the ejector rod mechanism 5. When the upper mold 11 continues to descend, the ballast block 42 first contacts and fits with the first support platform 36 to stabilize the bending axis of the material frame 100. When the upper mold 11 continues to descend, the second elastic member 43 begins to be stretched. At this time, the second elastic member 43 has an elastic pre-tightening force, so that the ballast block 42 can more stably press the first support platform 36 horizontally on the second support platform 37. And, due to the setting of the slider 44, it can be ensured that the second elastic member 43 is within the deformation safety range and will not be broken. Subsequently, the upper mold 11 continues to descend, so that the ejector rod mechanism 5 can contact the first frame plate 102 and the second frame plate 103.

[0086] Through the above settings, the bending axis of the material frame 100 can be in a stable state at all times during folding, effectively realizing the control of the extension direction during the deformation process of the prefabricated laminated flat plate, avoiding the disorder of the fiber texture of the prefabricated laminated flat plate, and effectively ensuring the finished product quality of the L-shaped structural member.

[0087] Step S6: Press and bend. The ejector rod mechanism 5 drives the flanging area of the material frame 100 to fold, so that the material frame 100 drives the prefabricated laminated flat plate to bend.

[0088] Specifically, in this embodiment, refer to Figure 8 、 Figure 9As shown, the ejector rod mechanism 5 includes a push rod 51 and a rolling wheel 52. The push rod 51 extends vertically, and one end of the push rod 51 is fixedly connected to the second horizontal substrate 111. One push rod 51 is provided at each of the four corners of the second horizontal substrate 111. Two of the push rods 51 are correspondingly arranged on the first frame plate 102, and the remaining two push rods 51 are correspondingly arranged on the second frame plate 103. The rolling wheel 52 is rotatably connected to the other end of the push rod 51. When the second elastic member 43 is in the restored state, the horizontal height of the rolling wheel 52 is higher than the horizontal height of the ballast block 42.

[0089] Through the above settings, the ejector rod mechanism 5 can contact the first frame plate 102 and the second frame plate 103 through the rolling wheel 52. During the process of driving the material box 100 to fold, the rolling wheel 52 can effectively reduce the friction between it and the first frame plate 102 and the second frame plate 103, thereby reducing the surface wear of the material box 100, extending the service life of the material box 100, and also helping the ejector rod mechanism 5 to descend continuously and smoothly, reducing the tremors and vibrations caused by direct contact, and further helping to improve the finished product quality of the L-shaped structural member.

[0090] Furthermore, the ejector rod mechanism 5 provided in this embodiment further includes a spacer block. The push rod 51 and the second horizontal substrate 111 can be detachably fixedly connected by means of threaded connection, snap connection, etc. By adding spacer blocks with different numbers or different thicknesses between the push rod 51 and the second horizontal substrate 111, the horizontal height difference between the ejector rod mechanism 5 and the ballast block 42 can be adjusted, realizing the control of the folding angle of the material box 100.

[0091] It should also be noted that, as Figure 4 shown, a third elastic member 105 is further provided on the material box 100 provided in this embodiment. The two ends of the third elastic member 105 are respectively fixedly connected to the first frame plate 102 and the second frame plate 103, so that when the material box 100 folds, the third elastic member 105 is stretched and has an elastic pre-tightening force, so that during the folding process of the material box 100, it is continuously in a restored pre-tightened state, avoiding the sudden drooping and separation of the first frame plate 102 or the second frame plate 103 from the ejector rod mechanism 5 during the folding process, and suddenly tensioning the upper surface of the prefabricated laminated flat plate, thereby generating wrinkles.

[0092] Through the thermoplastic composite material L-shaped structural member forming and bending control method provided by this embodiment, the prefabricated laminated flat plate can be quickly and efficiently transferred and positioned to a predetermined position in the mold first, and then the prefabricated laminated flat plate is always in a horizontal and stable bending axis state before folding through the ballast mechanism 4, preventing the prefabricated laminated flat plate from tilting and causing fiber pattern disorder. Finally, the ejector mechanism 5 is used to fold the material frame 100, thereby effectively avoiding the fracture of the elastic connection structure 200, and further ensuring that the prefabricated laminated flat plate can accurately adhere to and remain on the convex tooling surface 121 during the mold closing process, effectively realizing the control of the extension direction of the prefabricated laminated flat plate, avoiding the inaccurate situation of interlayer slip of the prefabricated laminated flat plate, and significantly improving the yield and quality of the L-shaped structural member.

[0093] In addition, in this embodiment, after step S6, it further includes:

[0094] Step S7, mold closing and forming. After the material frame 100 is folded in place, the mold is closed and maintained for a preset time.

[0095] Specifically in this embodiment, when the ejector mechanism 5 descends with the upper mold 11 until the upper mold 11 and the lower mold 12 are closed, the descent of the hot press plate 300 is stopped. At this time, the bottom surface of the prefabricated laminated flat plate in the material frame 100 is tightly attached to the convex tooling surface 121 of the lower mold 12 and maintained for a period of time, so that the prefabricated laminated flat plate after bending deformation gradually cools and solidifies to form the required L-shaped structural member.

[0096] Step S8, demolding treatment.

[0097] Specifically in this embodiment, the hot press plate 300 is driven to drive the upper mold 11 to rise, and the L-shaped structural member attached to the lower mold 12 is taken out.

[0098] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Forming and bending control method for thermoplastic composite L-shaped structural parts, characterized in that Including the steps: S1. Blanking, prefabricating a prefabricated laminated flat plate made of a thermoplastic composite material; S2. Hanging and loading, hanging the prefabricated laminated flat plate on a material frame (100) through an elastic connection structure (200); S3. Material heating, transferring the material frame (100) to a heating oven and heating it to a preset temperature; S4. Transferring and limiting, transferring the heated material frame (100) to a predetermined position on the mold, and limiting and locking the material frame (100) through a positioning mechanism (3); S5. Ballast fixing, controlling the material frame (100) to be in a horizontal and stable bending axis state through a ballast mechanism (4); S6. Top pressing and bending, a top rod mechanism (5) driving the flanging area of the material frame (100) to fold, so that the material frame (100) drives the prefabricated laminated flat plate to bend.

2. The forming and bending control method of the thermoplastic composite material L-shaped structural member according to claim 1, characterized in that Step S5 includes: S51. The ballast mechanism (4) contacting the bending axis of the material frame (100); S52. The top rod mechanism (5) contacting the flanging area of the material frame (100).

3. The forming and bending control method of the thermoplastic composite L-shaped structural member according to claim 1, characterized in that, In step S6, when the material frame (100) folds, the material frame (100) continuously remains in a restored pre-tightened state.

4. The forming and bending control method of the thermoplastic composite material L-shaped structural member according to claim 1, characterized in that After step S6, the following steps are further included: S7. Mold closing and forming, after the material frame (100) folds in place, the mold closes and maintains for a preset time; S8. Demolding treatment.

5. Forming device, characterized in that, Based on the thermoplastic composite material L-shaped structural member forming and bending control method according to any one of claims 1-4, including: a mold and a positioning mechanism (3), a ballast mechanism (4), and a top rod mechanism (5) installed on the mold, the positioning mechanism (3) being used to limit and lock the heated material frame (100), the ballast mechanism (4) being used to control the material frame (100) to be in a horizontal and stable bending axis state, and the top rod mechanism (5) being able to fit and contact and drive the flanging area of the material frame (100) to fold.

6. The molding device according to claim 5, characterized in that, It further includes a slide rail mechanism (2), the slide rail mechanism (2) being located between the heating oven and the mold and being used to push the heated material frame (100) into the mold.

7. The molding device according to claim 6, wherein The positioning mechanism (3) includes a base (31), a positioning stop block (32), and a positioning rod (33), and the material frame (100) includes a first frame plate (102) and a second frame plate (103), wherein: The base (31) is horizontally fixedly connected to the mold; The positioning stop block (32) is vertically fixedly connected to the base (31), and a positioning groove (321) is opened vertically thereon. The positioning groove (321) includes a first side wall (3211) and a second side wall (3212). The first side wall (3211) is arranged closer to the slide rail mechanism (2) than the second side wall (3212), and the horizontal height of the first side wall (3211) is lower than that of the second side wall (3212); The first frame plate (102) and the second frame plate (103) are hinged through the positioning rod (33). When the slide rail mechanism (2) pushes the material frame (100) so that the positioning rod (33) is in contact with the second side wall (3212), the positioning rod (33) can fall into the positioning groove (321).

8. The molding device according to claim 7, characterized in that, The positioning mechanism (3) further includes a positioning baffle (38) and a first elastic member (39), where: The positioning baffle (38) is rotatably connected to one side of the positioning block (32); Two ends of the first elastic member (39) are respectively fixed to one end of the positioning baffle (38) and the positioning block (32). When the first elastic member (39) is in a restored state, the positioning baffle (38) is inclined, and the other end of the positioning baffle (38) has an inclined surface, and the inclined surface is flush with the inner wall surface of the first side wall (3211); The positioning rod (33) can push the positioning baffle (38) to rotate, and when the slide rail mechanism (2) pushes the material frame (100) to the predetermined position and withdraws the slide rail mechanism (2), the inclined surface can be limited to abut against the positioning rod (33) so that the positioning rod (33) falls vertically into the positioning groove (321).

9. The molding device according to claim 8, wherein, The positioning mechanism (3) further includes a first support platform (36) and a second support platform (37). The first support platform (36) is fixed to the positioning rod (33). The second support platform (37) is set at a preset height. When the positioning rod (33) falls into the positioning groove (321), the first support platform (36) fits and abuts against the second support platform (37).

10. The molding device according to claim 9, characterized in that, The ballast mechanism (4) includes a structural frame (41) and a ballast block (42). The structural frame (41) is installed on the mold, and the ballast block (42) is arranged on the structural frame (41). When the ejector rod mechanism (5) drives the flanging area of the material frame (100) to fold, the ballast block (42) fits and abuts against the first support platform (36).

Images