Composite forming die for semi-closed H-shaped beam

Abstract

The utility model relates to a composite material forming die of a semi-closed H-shaped beam, and belongs to the field of aviation composite material manufacturing. Comprising an upper mold, a lower mold, a left mold core, a right mold core, a front check block and a rear check block, the inner side wall faces of the left mold core and the right mold core are oppositely matched, a gap is reserved between the left mold core and the right mold core to form a web cavity of the H-shaped beam, and the rear wall face of the front check block is oppositely matched with the inner wall faces of the front ends of the left mold core and the right mold core, and a gap is reserved to form a front end face cavity of the H-shaped beam. The front end wall face of the rear check block is oppositely matched with the rear end inner wall faces of the left mold core and the right mold core, a gap is reserved between the front end wall face of the rear check block and the rear end inner wall faces of the left mold core and the right mold core to form a rear end face cavity of the H-shaped beam, and the upper planes of the left mold core and the right mold core are both sunken inwards and matched with the inner wall face of the top of the upper mold to form an upper mold face cavity of the H-shaped beam. And the lower planes of the left mold core and the right mold core are concave inwards and are matched with the inner wall surface of the bottom of the lower mold to form a lower mold surface cavity of the H-shaped beam. The die is simple in structure and accurate in positioning, and the working efficiency and the part quality of manufacturing of the semi-closed H-shaped beam made of the composite material are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of aviation composite material manufacturing, concretely relates to a kind of composite material forming die of semi-closed H-shaped beam. BACKGROUND

[0002] Composite material is more and more widely applied to various aircrafts due to the advantages of high specific strength, high specific stiffness, performance design, fatigue resistance and corrosion resistance, which greatly promotes the lightweight, high performance and structural function integration design of aircraft. As a main load-bearing structural member, semi-closed H-shaped beam has important application in load-bearing assembly parts such as wing and movable wing surface main beam. Therefore, new technology is urgently needed to better manufacture composite material semi-closed H-shaped beam to improve the integrity, strength and precision of composite material semi-closed H-shaped beam, reduce manufacturing cost and cycle, and meet the demand of high-performance structural member in aerospace field.

[0003] Semi-closed H-shaped beam refers to a beam with H-shaped cross section and uniform thickness of wing plate and web. Traditional composite material semi-closed H-shaped beam forming usually prepares upper wing plate, lower wing plate and web by flat die pressing respectively, and then combines them together by secondary gluing process. The process is complicated and involves many procedures and operation links, which not only increases the time cost and labor cost of production, but also easily introduces errors and uncertainties in each link, affecting the quality and performance stability of products. The semi-closed H-shaped beam prepared by traditional method may have defects in integrity and mechanical properties. For example, the secondary gluing part may become a weak point of the structure, reducing the overall strength and stiffness of the beam, making it perform worse than expected when bearing large bending and shear force, unable to fully exert the excellent performance advantages of composite material, and difficult to meet the demand of some high-performance structure application scenarios. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a composite material forming die for semi-closed H-shaped beam, which solves the problems of low manufacturing efficiency and poor quality of parts of existing semi-closed H-shaped beam.

[0005] The technical solution adopted in this utility model is as follows: A composite molding die for a semi-enclosed H-shaped beam includes an upper die, a lower die, a left core, a right core, a front stop, and a rear stop. The upper die and the lower die are combined to form a mold cavity. The left core, the right core, the front stop, and the rear stop are all located in the mold cavity. The inner sidewalls of the left core and the right core are fitted together with a gap between them to form the web cavity of the H-shaped beam. The front and rear end bosses of the left core and the right core are respectively inserted into the grooves of the front stop and the rear stop and fixedly connected by bolts. The rear wall surface of the front stop block mates with the front inner wall surfaces of the left and right cores, leaving a gap to form the front cavity of the H-beam. The front wall surface of the rear stop block mates with the rear inner wall surfaces of the left and right cores, leaving a gap to form the rear cavity of the H-beam. The upper surfaces of the left and right cores are both recessed inward and mate with the top inner wall surface of the upper mold to form the upper cavity of the H-beam. The lower surfaces of the left and right cores are both recessed inward and mate with the bottom inner wall surface of the lower mold to form the lower cavity of the H-beam.

[0006] Furthermore, the web cavity is located between the upper surface cavity and the lower surface cavity and connects the two.

[0007] Furthermore, the web cavity is located between the front face cavity and the rear face cavity and connects the two.

[0008] Furthermore, it also includes a lifting mechanism. Both the upper and lower molds have two semi-circular through holes on their side walls that fit together. One end of the lifting mechanism passes through the through holes and is threadedly connected to the inner holes of the side walls of the left or right core, respectively.

[0009] Furthermore, it also includes a demolding block, wherein the upper mold has a demolding hole, and the demolding block is installed in the lower cavity of the demolding hole, and the demolding block is located above the upper surface cavity of the H-beam.

[0010] Furthermore, the front and rear ends of the left and right cores are respectively positioned with the front and rear stops via mortise and tenon joints.

[0011] Furthermore, composite material prepreg is laid in the web cavity, front face cavity, rear face cavity, upper face cavity and lower face cavity.

[0012] The utility model has the advantages and beneficial effects that: the utility model reduces the work difficulty of manufacturing the composite material semi-closed H-shaped beam, improves the part manufacturing efficiency, improves the part quality compared with the traditional mode, and the semi-closed H-shaped beam manufactured by integral molding greatly enhances the mechanical properties of the part, improves the manufacturing level of the semi-closed H-shaped beam composite material part, and further improves the production efficiency, improves the utilization rate of material, reduces the material cost, and simultaneously reduces the generation of waste. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the mold structure exploded schematic view of the utility model;

[0014] Figure 2 It is the mold plan view of the utility model;

[0015] Figure 3 It is Figure 2 A-A schematic view of;

[0016] Figure 4 It is Figure 2 C-C schematic view of;

[0017] Figure 5 It is the mold side view of the utility model;

[0018] Figure 6 It is Figure 5 B-B schematic view of;

[0019] Figure 7 It is the semi-closed H-shaped beam schematic view of the composite material manufactured by the utility model; DETAILED DESCRIPTION

[0020] The technical scheme in the utility model will be described clearly and completely below, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. All other embodiments obtained by the person skilled in the art based on the utility model belong to the scope of the utility model protection. The utility model will be further explained by combining with the drawings of the specification:

[0021] Embodiment 1

[0022] As Figures 1-6As shown, a kind of composite forming die of semi-closed H-shaped beam includes upper die 1, lower die 2, left core 3, right core 4, front stopper 5 and rear stopper 6, the upper die 1 and lower die 2 are combined to form the die cavity in the interior, the left core 3, right core 4, front stopper 5 and rear stopper 6 are all located in the die cavity, the inner side wall surface of the left core 3 and right core 4 is matched oppositely and there is a gap to form the web cavity 11 of H-shaped beam, the front and rear end bosses of the left core 3 and right core 4 are inserted into the recesses of front stopper 5 and rear stopper 6 respectively and fixedly connected by bolts, the rear wall surface of front stopper 5 is matched oppositely with the front end inner wall surface of left core 3 and right core 4 and there is a gap to form the front end surface cavity 12 of H-shaped beam, the front end wall surface of rear stopper 6 is matched oppositely with the rear end inner wall surface of left core 3 and right core 4 and there is a gap to form the rear end surface cavity 13 of H-shaped beam, the upper plane of left core 3 and right core 4 is concave inward and matched with the inner wall surface of the top of upper die 1 to form the upper surface cavity 14 of H-shaped beam, the lower plane of left core 3 and right core 4 is concave inward and matched with the inner wall surface of the bottom of lower die 2 to form the lower surface cavity 15 of H-shaped beam.

[0023] The web cavity 11 is located between the upper surface cavity 14 and lower surface cavity 15 and connects the two, the web cavity 11 is located between the front end surface cavity 12 and rear end surface cavity 13 and connects the two, the front and rear ends of left core 3 and right core 4 are positioned by mortise and tenon structure with front stopper 5 and rear stopper 6 respectively.

[0024] The embodiment also comprises the jacking mechanism 16, the two side walls of the upper die 1 and the lower die 2 are provided with two upper and lower matched semicircular through holes, one end of the jacking mechanism 16 is respectively connected with the inner holes of the two side walls of the left core 3 or the right core 4 through the through holes, the jacking mechanism 16 is arranged, in the demolding process, the demolding defect caused by the deep cavity wrapping is solved, the jacking mechanism 16 is screwed in through the bolt, and the rotation stop block is arranged in the jacking mechanism 16, the rotation stop block can advance in the advancing direction of the bolt and cannot rotate, and the problem that the jacking surface scratches the inner surface of the part is solved. In use, the jacking mechanism 16 is combined and installed with the left core 3 and the right core 4, the jacking mechanism surface and the left core 3 or the right core 4 surface are ensured to be a plane, so that the flatness of the aviation composite inner surface is improved, the composite material prepreg is laid according to the corresponding lay-up sequence through the surfaces of the left core 3 and the right core 4, the two cores are fixed through the bolt positioning of the positioning holes on the two sides of the left core 3 and the right core 4. The outer surface of the two cores is arranged according to the corresponding lay-up, the lay-up of the circumferential wing plate is completed, the front stop block 5 and the rear stop block 6 are fixed on the two sides of the part through the fixing bolt, finally, the wedge-shaped structure core which has been combined is clamped by the upper die 1 and the lower die 2, and is pre-compacted and compacted and solidified, because the working surfaces of the non-product surfaces of the left core 3, the right core 4, the front stop block 5 and the rear stop block 6 are all provided with wedge-shaped inclined angles, the inclined angles of the corresponding positions of the upper die 1 and the lower die 2 are kept consistent, so that the mold can be further compacted in place through the wedge-shaped inclined angle in the mold pressing process by the press, and the internal gas is discharged;

[0025] The embodiment also comprises the demolding block 10, the upper die 1 is provided with the demolding hole 9, the demolding block 10 is arranged in the lower cavity of the demolding hole 9.

[0026] The utility model discloses reduce the work difficulty of composite material semi-enclosed H type beam manufacturing, improve the part manufacturing efficiency, and compared with the traditional mode, improve the part quality, and the semi-enclosed H type beam of integrated molding manufacturing greatly strengthens the mechanical property of part, improves the manufacturing level of semi-enclosed H type beam composite material part.

[0027] Embodiment 2

[0028] The embodiment adopts the molding method of the semi-enclosed H type beam composite material obtained by the molding die as recorded in embodiment 1, and the steps are as follows:

[0029] Step 1: blanking: the composite material prepreg is cut according to the die size, and is divided into three sizes of the left core 3, the right core 4 and the wing plate area 3;

[0030] Step 2: Mold preparation: Apply release agent and assemble the various cores together;

[0031] Step 3: Lay-up: Lay the composite prepreg onto the left core 3 and the right core 4 respectively, and use bolts to position them through the positioning holes on both sides of the left core 3 and the right core 4 to fix the two cores together to form a semi-closed H-beam web structure; then lay up the prepreg in the flange area.

[0032] Step 4: Mold Closure: Close the upper and lower molds, fix the front and rear blocks with fixing bolts, and finally close the assembled wedge-shaped core with the upper and lower molds for pre-compaction and compaction. Since the non-product working surfaces of the left core 3, right core 4, front block 5, and rear block 6 are all provided with wedge-shaped angles, which are consistent with the corresponding angles of the upper mold 1 and lower mold 2, the mold can be further compacted into place by the press during the molding process, thus realizing the four-way wedge-shaped closing structure of the X-axis and Y-axis.

[0033] Step 5: Curing: Curing is carried out according to the standard curing parameters for composite materials, and a pressure of 0.2 MPa is continuously applied to the mold using a press molding method;

[0034] Step 6: Demolding: Remove the outer mold and use bolts and a lifting mechanism to remove the core mold from the deep cavity of the part. The lifting mechanism is screwed in by bolts, and an anti-rotating block is set in the lifting mechanism so that the anti-rotating block can move forward in the direction of bolt travel.

[0035] Step 7: Grinding and Finishing: Cut and finish according to the outer mold cutting line, grind off excess glue, inspect and deliver. Figure 7 As shown, a semi-closed H-shaped beam made of composite material is obtained.

Claims

1. A composite forming die for a semi-closed H-beam, comprising an upper die (1), a lower die (2), a left core (3), a right core (4), a front stopper (5) and a rear stopper (6), the upper die (1) and the lower die (2) forming a die cavity inside after being combined, characterized in that: The left core (3), the right core (4), the front block (5) and the rear block (6) are located in the mold cavity, the inner side wall surfaces of the left core (3) and the right core (4) are oppositely matched and a gap is left to form a web cavity (11) of the H-shaped beam, the front and rear end bosses of the left core (3) and the right core (4) are respectively inserted into the grooves of the front block (5) and the rear block (6) and are fixedly connected by bolts, the rear wall surface of the front block (5) is oppositely matched with the front end inner wall surfaces of the left core (3) and the right core (4) and a gap is left to form a front end surface cavity (12) of the H-shaped beam, the front end wall surface of the rear block (6) is oppositely matched with the rear end inner wall surfaces of the left core (3) and the right core (4) and a gap is left to form a rear end surface cavity (13) of the H-shaped beam, the upper planes of the left core (3) and the right core (4) are both inwardly recessed and are matched with the inner wall surfaces of the top of the upper die (1) to form an upper surface cavity (14) of the H-shaped beam, and the lower planes of the left core (3) and the right core (4) are both inwardly recessed and are matched with the inner wall surfaces of the bottom of the lower die (2) to form a lower surface cavity (15) of the H-shaped beam.

2. A composite forming tool for a semi-closed H-beam according to claim 1, characterized in that: The web cavity (11) is located between the upper surface cavity (14) and the lower surface cavity (15) and connects the two cavities.

3. A composite forming tool for a semi-closed H-beam according to claim 1, characterized in that: The web cavity (11) is located between the front end surface cavity (12) and the rear end surface cavity (13) and connects the two cavities.

4. A composite forming tool for a semi-closed H-beam according to claim 1, characterized in that: The ejection mechanism (16) is further included, two half-circular through holes that are matched in up-down direction are formed in the side walls of the upper die (1) and the lower die (2), and one end of the ejection mechanism (16) is threadedly connected with the inner holes of the side walls of the left core (3) or the right core (4) through the through holes.

5. A composite forming tool for a semi-closed H-beam according to claim 1, characterized in that: The ejection mechanism (16) is further included, two half-circular through holes that are matched in up-down direction are formed in the side walls of the upper die (1) and the lower die (2), and one end of the ejection mechanism (16) is threadedly connected with the inner holes of the side walls of the left core (3) or the right core (4) through the through holes.

6. A semi-closed H-beam composite forming die according to any one of claims 1-5, characterized in that: The front and rear ends of the left core (3) and the right core (4) are respectively positioned by the mortise and tenon structure of the front block (5) and the rear block (6).

7. A composite forming tool for a semi-closed H-beam according to claim 6, characterized in that: The composite material prepreg is laid in the web cavity (11), the front end surface cavity (12), the rear end surface cavity (13), the upper surface cavity (14) and the lower surface cavity (15).

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