High-precision forming tooling for composite C-beam with transverse long truss parts

Abstract

The present invention proposes a high-precision molding tool for composite material C-beam parts with transverse long girders, which belongs to the technical field of composite material processing and molding. The tool includes a reinforcement frame, a transition copper plate, a molding frame, a long girder stacking mold, a positioning block at the end of the long girder, a lifting device, a positioning groove, an inner skin metal cover plate, a vertical plate of a beam round bar, a beam edge baffle, a bridge-type drilling mold and a drilling mold reinforcement sheet. The present invention uses a tooling structure similar to a female and male mold to complete the stacking, positioning, curing and processing of C-beam parts with long girders; in order to ensure the convenience of demoulding, some tooling adopts a segmented structure, and the butt joint surface is designed to be at a certain angle, and demoulding is carried out in a certain order, which overcomes the problems of the inability to ensure the accuracy of the inner profile of the C-beam parts and the difficulty of demoulding the male mold tooling.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material processing and forming, and relates to a high-precision forming tool for composite material C-shaped beam parts with transverse long stringers, which is mainly used for stacking, positioning and forming parts with long stringers in the length direction of the inner profile of beams, so as to ensure that the inner and outer profiles of the formed beam parts have high precision. Background Art

[0002] Composite materials are composed of two materials: resin and carbon fiber. Carbon fiber changes little under high temperature and high pressure, while resin undergoes a glass transition under high temperature and high pressure. At a certain stage of the transition, the resin will flow like water, causing the sinking position of the part to shift. Therefore, in order to ensure the accuracy of the profile or sinking position, the tooling contour is relied upon. In addition to factors such as the ease of demoulding of the part, the tooling structure, and convenient processing, the selection of the tooling negative mold and positive mold mainly depends on the aerodynamic shape of the part, because the aerodynamic shape of the part requires higher profile accuracy, and metal tooling is needed to ensure the profile accuracy of the part.

[0003] There are three main ways to form composite parts and long strings: co-curing, adhesive co-curing, and secondary adhesive bonding. Co-curing is the most difficult to process, because co-curing not only ensures that the parts and the long stringers are cured separately, but also ensures the relative position relationship between the long stringers and the parts and the bonding strength. C-beam parts rarely have internal long stringer structures and are formed by co-curing. The tooling of the C-beam must first consider the rebound caused by the C-type structure during the part forming process, and a certain rebound compensation value should be given in the process of designing the tooling; secondly, the combination of the long stringer and the beam must be considered. Some positioning devices must be arranged on the non-working surface of the tooling to position the long stringer, and in order to ensure the hoisting of the long stringer, certain hoisting equipment must be added to the long stringer tooling; finally, the cost of the tooling must be considered, and the material of the tooling must be selected according to the length of the part. Generally, INVAR material is selected for tooling of parts longer than 6m, and ordinary steel is selected for tooling of parts less than 6m.

[0004] The outer side of composite C-beam parts is usually the pneumatic surface, and the pneumatic surface is usually the assembly surface that requires high precision, so most C-beam forming tools use a female mold structure. C-beams generally provide 1° to 3° of springback compensation depending on the thickness and material grade of the parts. The current C-beam not only has a long stringer inside, but also requires the accuracy of the inner and outer surfaces. The traditional single female mold structure cannot be used. If a male and female combined mold is used, demoulding will be difficult due to the closing problem of the C-beam. Summary of the invention

[0005] In order to solve the problems of difficult positioning of long girders, poor internal and external surface accuracy, and difficult demoulding of C-shaped beams with long girders, the present invention provides a tool for stacking, forming, and demoulding of composite material C-shaped beams with long girders. The use of this tool can solve the problems of difficult positioning of long girders of composite material beam parts, poor internal surface accuracy, etc.

[0006] The technical solution of the present invention is:

[0007] A high-precision forming tool for a composite material C-beam with a transverse long stringer part comprises a support system, a long stringer layup forming system and a C-beam layup forming system.

[0008] The support system is used to support other components and serve as a laying reference for the web of the C-beam; it includes a strong frame 1, a transition copper plate 2 and a forming frame 3. Among them, the strong frame 1 is located at the bottom of the whole set of tooling and is a frame welded from ordinary steel material; casters are connected to the bottom of the strong frame 1 for tooling movement, and a docking plate is left above the strong frame 1. The forming frame 3 is located above the strong frame 1 and is welded from a Yinwa steel plate, which is also the main body of the C-beam tooling. A docking plate is also left on the bottom surface of the forming frame 3. The transition copper plate 2 is located between the docking plates of the strong frame 1 and the forming frame 3, and the transition copper plate 2, the strong frame 1 and the forming frame 3 are connected together by screws. The strong frame 1 and the forming frame 3 are used as a whole to ensure the overall strength and rigidity of the tooling. Due to the different expansion coefficients of the two frames, as the expansion difference of the frames increases during the curing temperature of the parts, the tooling may collapse. The transition copper plate 2 softens under the action of high temperature and acts as a lubricant in the middle, allowing a certain amount of displacement of frames of different materials.

[0009] The long-beam stacking forming system is used to complete the stacking of T-shaped angle materials and the combined positioning of T-shaped angle materials and the stacked C-shaped beams; it includes a long-beam stacking mold 4, a positioning block 5 at the end of the long-beam, a lifting device 6 and a positioning groove 7. Among them, the long-beam stacking mold 4 is made of female tile steel with a rubber retaining groove inside, and is composed of two L-shaped movable parts, which are used to stack T-shaped long beams and combine with C-shaped beams. The positioning block 5 at the end of the long-beam is a Y-shaped block, the opening of which is clamped on the end of the long-beam stacking mold 4, and the other end of the positioning block 5 at the end of the long-beam is combined and fixed with the positioning groove 7. The positioning groove 7 is in the shape of a U-groove, located at both ends of the long beam in the length direction, and is positioned with the forming frame 3 using pins. The lifting device 6 is an h-shaped block, the opening of which is clamped on the lifting ear of the long-beam stacking mold 4.

[0010] The C-beam stacking and forming system is used to complete the stacking, curing, and processing of the C-beam, and includes an inner skin metal cover plate 8, a vertical plate 9 of a beam round bar, a beam edge baffle plate 10, a bridge-type drilling template 11, a drilling template reinforcement plate 12, a round head screw 13, a pin 14, and a knurled high head bolt 15. Among them, the vertical plates 9 of the beam round bar are located on both sides of the length direction of the forming frame 3, and are positioned and connected by round head screws 13 and pins 14. The vertical plates 9 of the beam round bar and the upper plate of the forming frame 3 are combined into a C-beam stacking template. The beam edge baffle plate 10 is located at the two side ends of the vertical plates 9 of the beam round bar. The beam edge baffle plate 10 at each end is divided into three pieces, corresponding to the vertical plates 9 of the beam round bar on both sides and the middle C-beam web area, and the three pieces are positioned and connected to the forming frame 3 by round head screws 13 and pins 14.

[0011] The inner skin metal cover plate 8 covers the inner profile of the C-shaped beam after paving. The bridge-type drilling jig 11 is a flat F-shaped structure, the outer vertical surface of which contacts the boss of the forming frame 3 and is positioned by pins 14 and knurled high-head bolts 15; the inner vertical surface contacts the ear piece of the part to ensure the stability of the drilling jig when it rotates; the end of the upper horizontal surface is provided with a drilling hole, and the drilling hole is provided with a drilling jig reinforcement sheet 12.

[0012] The beneficial effects of the present invention are as follows: the present invention utilizes a tooling structure similar to a female mold and a male mold to complete the stacking, positioning, curing and processing of C-beam parts with long stringers; in order to ensure the convenience of demoulding, some tooling adopts a segmented structure, and the butt joint surface is designed to be at a certain angle, and demoulding is carried out in a certain order, thereby overcoming the problems of the inability to ensure the accuracy of the inner surface of the C-beam structure parts and the difficulty in demoulding the male mold tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the support system; (a) is the main view and (b) is the top view.

[0014] Figure 2 Schematic diagram of the long stringer lay-up forming system.

[0015] Figure 3 This is a schematic diagram of the long stringer positioning.

[0016] Figure 4 Schematic diagram of the C-beam layup forming system.

[0017] Figure 5 This is the main view after the tooling is assembled.

[0018] Figure 6 This is a top view of the tooling after assembly.

[0019] Among them: 1 reinforcement frame; 2 transition copper plate; 3 forming frame; 4 long girder laying mold; 5 positioning block at the end of the long girder; 6 lifting device; 7 positioning groove; 8 inner skin metal cover plate; 9 vertical plate of beam round bar; 10 beam edge baffle; 11 bridge-type drilling jig; 12 drilling jig reinforcement plate; 13 round head screw; 14 pin; 15 knurled high head bolt. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further explained below in conjunction with the examples and drawings, but is not intended to limit the present invention.

[0021] A high-precision forming tool for a composite material C-beam with a transverse long stringer part comprises a support system, a long stringer layup forming system and a C-beam layup forming system.

[0022] The support system is used to support other components and serve as a paving reference for the web of the C-beam; it includes a strong frame 1, a transition copper plate 2 and a forming frame 3. Among them, the strong frame 1 is located at the bottom of the whole set of tooling, and is a frame welded from ordinary steel material; casters are connected to the bottom of the strong frame 1 for the movement of the tooling, and a docking plate is left above the strong frame 1. The forming frame 3 is located above the strong frame 1, and is welded from a Yinwa steel plate, and is also the paving body of the C-beam tooling. A docking plate is also left on the bottom surface of the forming frame 3. The transition copper plate 2 is located between the docking plates of the strong frame 1 and the forming frame 3, and the transition copper plate 2, the strong frame 1 and the docking plates of the forming frame 3 are connected together by screws. The strong frame 1 and the forming frame 3 are used as a whole to ensure the overall strength and rigidity of the tooling.

[0023] The long-beam stacking forming system is used to complete the stacking of T-shaped angle materials and the combination and positioning of T-shaped angle materials with the stacked C-shaped beams; it includes a long-beam stacking mold 4, a positioning block 5 at the end of the long-beam, a lifting device 6 and a positioning groove 7. Among them, the long-beam stacking mold 4 is made of female tile steel with a rubber retaining groove inside, and is composed of two L-shaped movable parts, which are used to stack T-shaped long beams and combine with C-shaped beams. The positioning block 5 at the end of the long-beam is a Y-shaped block, the opening of which is clamped on the end of the long-beam stacking mold 4, and the other end of the positioning block 5 at the end of the long-beam is combined and fixed with the positioning groove 7. The positioning groove 7 is in the shape of a U-groove, located at both ends of the long beam in the length direction, and is positioned with the forming frame 3 using pins. The lifting device 6 is an h-shaped block, the opening of which is clamped on the lifting ear of the long-beam stacking mold 4.

[0024] The C-beam stacking and forming system is used to complete the stacking, curing, and processing of the C-beam, and includes an inner skin metal cover plate 8, a vertical plate 9 of a beam round bar, a beam edge baffle plate 10, a bridge-type drilling template 11, a drilling template reinforcement plate 12, a round head screw 13, a pin 14, and a knurled high head bolt 15. Among them, the vertical plates 9 of the beam round bar are located on both sides of the length direction of the forming frame 3, and are positioned and connected by round head screws 13 and pins 14. The vertical plates 9 of the beam round bar and the upper plate of the forming frame 3 are combined into a C-beam stacking template. The beam edge baffle plate 10 is located at the two side ends of the vertical plates 9 of the beam round bar. The beam edge baffle plate 10 at each end is divided into three pieces, corresponding to the vertical plates 9 of the beam round bar on both sides and the middle C-beam web area, and the three pieces are positioned and connected to the forming frame 3 by round head screws 13 and pins 14.

[0025] The inner skin metal cover plate 8 covers the inner profile of the C-shaped beam after paving. The bridge-type drilling jig 11 is a flat F-shaped structure, the outer vertical surface of which contacts the boss of the forming frame 3 and is positioned by pins 14 and knurled high-head bolts 15; the inner vertical surface contacts the ear piece of the part to ensure the stability of the drilling jig when it rotates; the end of the upper horizontal surface is provided with a drilling hole, and the drilling hole is provided with a drilling jig reinforcement sheet 12.

[0026] The specific implementation steps of the above-mentioned high-precision molding tooling for composite material C-beam with transverse long stringer parts are as follows:

[0027] 1) Connect the reinforcing frame 1, the transition copper plate 2, and the forming frame 3 together by screws, and fix the vertical plate 9 of the beam round bar and the beam edge baffle 10 to the upper plane of the forming frame 3 by round head screws 13 and pins 14. At this time, the tooling can be regarded as a female mold stacking mold, and the C-shaped beam is stacked on the forming frame 3 and the vertical plate 9 of the beam round bar.

[0028] 2) Separate the two L-shaped movable parts of the long-beam stacking mold 4, stack an L-shaped one on each L-shaped movable part, and stack the lying side of the T-shaped angle material on the assembled flat plate of the long-beam stacking mold 4. Fill the rubber retaining groove in the joint of the long-beam stacking mold 4 with cylindrical rubber of corresponding specifications, and then combine the three parts together.

[0029] 3) After the long-beam stacking mold 4 is assembled, the lifting device 6 is installed on its lifting lugs and fixed together with round head screws 13. The two ends of the long-beam stacking mold 4 in the length direction are respectively pinned with pins 14 to accurately position the positioning blocks 5 at the ends of the long-beam stacking mold.

[0030] 4) Lift the long stringer stacking mold 4, put the positioning block 5 at the end of the long stringer into the conical guide groove of the positioning groove 7, and gradually move it downward until it is positioned. Each long stringer stacking mold 4 is operated in this way until all the long strings are positioned.

[0031] 5) Place the inner skin metal cover plate 8 on the inner skin of the C-beam and use the pins 14 to position it with the vertical plate 9 of the beam round bar. Encapsulate and solidify on the forming frame 3. The molded parts are removed from the tooling in the order of the long stringer layup mold 4, the inner skin metal cover plate 8, the beam edge baffle 10, and the vertical plate 9 of the beam round bar.

[0032] 6) The bridge-type drilling jig 11 is installed on the boss of the forming frame 3 on one side, and the other side presses the edge of the part ear. The drilling jig reinforcement sheet 12 is installed on the drill hole at the end of the bridge-type drilling jig 11, and then drilling is performed. After the drilling is completed, the part is processed.

Claims

1. A high-precision forming tool for composite material C-beam with transverse long truss parts, characterized in that: The tooling includes a support system, a long stringer lay-up forming system and a C-beam lay-up forming system; The support system comprises a strong frame (1), a transition copper plate (2) and a forming frame (3); wherein the strong frame (1) is located at the bottom of the whole set of tooling, casters are connected to the bottom of the strong frame (1) for moving the tooling, and a docking plate is left above the strong frame (1); the forming frame (3) is located above the strong frame (1), and a docking plate is left on the bottom surface of the forming frame (3); the transition copper plate (2) is located between the docking plates of the strong frame (1) and the forming frame (3), and the transition copper plate (2), the strong frame (1) and the docking plates of the forming frame (3) are connected together, and the strong frame (1) and the forming frame (3) are used as a whole to ensure the overall strength and rigidity of the tooling; The long-beam stacking forming system comprises a long-beam stacking mold (4), a positioning block (5) at the end of the long-beam, a lifting device (6) and a positioning groove (7); wherein the long-beam stacking mold (4) is composed of two L-shaped movable parts, which are used to stack T-shaped long beams and are combined with C-shaped beams; the positioning block (5) at the end of the long-beam is a Y-shaped block, whose opening part is clamped on the end of the long-beam stacking mold (4), and the other end of the positioning block (5) at the end of the long-beam is combined and fixed with the positioning groove (7); the positioning groove (7) is in the shape of a U-groove, located at both ends of the long-beam in the length direction, and is positioned with a forming frame (3) using pins; the lifting device (6) is an H-shaped block, whose opening part is clamped on the lifting ear of the long-beam stacking mold (4); The C-beam stacking forming system comprises an inner skin metal cover plate (8), a vertical plate (9) of a beam round bar, a beam edge baffle plate (10), a bridge-type drilling template (11), a drilling template reinforcement plate (12), a round head screw (13), a pin (14) and a knurled high head bolt (15); wherein the vertical plates (9) of the beam round bar are located on both sides of the length direction of the forming frame ((3)), and are positioned and connected by round head screws (13) and pins (14); the vertical plates (9) of the beam round bar and the upper plate of the forming frame (3) are combined into a C-beam stacking template; the beam edge baffle plate (10) is located at the two side ends of the vertical plates (9) of the beam round bar, and the beam edge baffle plate (10) at each end is divided into three pieces, which respectively correspond to the vertical plates (9) of the beam round bar on both sides and the middle C-beam web area, and the three pieces are positioned and connected to the forming frame (3) by round head screws (13) and pins (14); The inner skin metal cover plate (8) covers the inner profile of the C-beam after folding; the bridge-type drilling template (11) is a flat F-shaped structure, the outer vertical surface of which contacts the boss of the forming frame (3) and is positioned by pins (14) and knurled high-head bolts (15); the inner vertical surface contacts the ear piece of the part to ensure the stability of the drilling template when it rotates; a drill hole is provided at the end of the upper horizontal surface, and a drilling template reinforcement plate (12) is provided on the drill hole.

2. A high-precision forming tool for composite material C-beam with transverse long stringer parts according to claim 1, characterized in that: The strong frame (1) is a frame welded from common steel material; the forming frame (3) is welded from lining steel plates.

3. A high-precision forming tool for composite material C-beam with transverse long stringer parts according to claim 1 or 2, characterized in that: The material of the long-beam laying and stacking mold (4) is female tile steel and is provided with a rubber retaining groove.

Images