Large-size composite material u-shaped cross-section rotary body component forming mold and forming method thereof

Abstract

The present application relates to a kind of large-size composite U-shaped section rotary body component forming die and its forming method, U-shaped section rotary body component forming die includes bottom plate, stripper plate, side plate, core plate.Adopt U-shaped rotary body forming die, carbon fiber composite material prepreg is laid on the outside of side plate, then the bag pressure forming of product hot press tank is carried out, after forming, first, stripper plate under side plate is all unlocked, remove, so that side plate falls to bottom plate, side plate top and step type clamping groove side are separated, push force is applied at the bottom of side plate, and side plate is pushed to core plate side, now, side plate and product side wall are completely separated, and the U-shaped section rotary body component product of forming can be taken off from core plate.According to the present application, composite part demoulding is smooth, composite material product size is accurate, and there is no damage defect in nondestructive testing.No damage defect in nondestructive testing.And this application is convenient to disassemble and assemble, reliable, large, small deformation, low cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical forming, and particularly relates to a large-size composite U-shaped cross-section rotary body part forming die and a forming method thereof. BACKGROUND

[0002] In recent years, composite materials are widely used in various fields due to their light weight and high strength, and some rotary body structure products required by simulation tests of various industries are also gradually replaced by composite materials for manufacturing.

[0003] The U-shaped rotary body composite part is usually formed by a hot press tank. The cross section of the part is U-shaped and closed loop, the curvature of the part is large, and when the loop-shaped part is cured at high temperature, local stress concentration is easy to occur, and the part is easy to have damage defects. Therefore, the part not only needs to ensure smooth demolding of the composite part, but also needs to ensure the theoretical shape of the composite product and the requirements of non-destructive testing and non-damage defects. In addition, for large-size U-shaped rotary body composite parts (the three-dimensional size of the product is between 600mm and several meters), the type surface of the part is complex, the forming is complex, and the lamination operation of the composite material is difficult. The structure of the forming die is the key to product forming. However, due to the requirements of such parts for various occasions and the processing difficulty and cost, the current forming die is difficult to meet the above requirements. SUMMARY

[0004] In view of the above problems, the present application provides a large-size composite U-shaped cross-section rotary body part forming die and a forming method thereof.

[0005] To achieve the above purpose, the technical scheme of the large-size composite U-shaped cross-section rotary body part forming die is as follows:

[0006] A large-size composite U-shaped cross-section rotary body part forming die, characterized in that:

[0007] It comprises a bottom plate, a ring-shaped forming structure arranged on the bottom plate, and a core plate arranged on the bottom plate and used for supporting.

[0008] The forming structure comprises a core plate arranged in a ring shape and lockable on the bottom plate, a top part forming a U-shaped cross-section rotary body part top forming surface, and a core plate arranged on both sides of the core plate and lockable on the bottom plate.

[0009] The core plate is arranged on both sides of the core plate, and the top part of the core plate is matched with the core plate top forming surface.

[0010] The side plate is arranged on both sides of the core plate, the top part of the core plate is matched with the core plate top forming surface, the outer side surface forms a side forming surface of the U-shaped cross-section rotary body part, the bottom part is provided with a mounting plate, and the side plate is lockable on the stripping plate.

[0011] The draw-on plate, the core plate and the side plate are in a split structure, wherein a group of the split bodies comprises a core plate and its corresponding two side plates and a plurality of draw-on plates at the lower part of the side plates, the split body is in an inside-out eight-shaped structure, and the left and right sides of the forming structure are symmetrically split,

[0012] Therefore, the core plate, the side plate and the draw-on plate can be combined into a ring-shaped forming structure, and the inside-out eight-shaped structure of the split body can ensure that the overall structure is firm and stable. When the mold works in a high-temperature environment, the split structure can disperse stress and avoid stress concentration in the bending part, effectively reducing the deformation of the mold and improving the production precision.

[0013] The large-size composite material U-shaped cross-section rotary body part forming mold, characterized in that:

[0014] The bottom plate is in an integral structure, the center is hollow, and the bottom side adopts a reinforcing rib structure.

[0015] Therefore, the weight of the mold can be reduced while the strength of the bottom plate structure is increased.

[0016] The large-size composite material U-shaped cross-section rotary body part forming mold, characterized in that:

[0017] According to the physical size of the product and the allowable deformation amount, the size of the mold (the bottom plate, the draw-on plate, the core plate and the side plate) is calculated,

[0018] According to the hot pressing tank forming requirement, the overall mold structure is determined.

[0019] The large-size composite material U-shaped cross-section rotary body part forming mold, characterized in that:

[0020] In the draw-on plate of the left and right symmetric split structure, the height of one split draw-on plate is slightly lower than that of the other draw-on plates.

[0021] Therefore, the lower draw-on plate can be disassembled first, and the disassembly is more convenient.

[0022] The large-size composite material U-shaped cross-section rotary body part forming mold, characterized in that:

[0023] The core plate is in an I-shaped structure with a wide top and a narrow bottom, and the narrow bottom can be locked on the base, and the wide top forms a top forming surface.

[0024] The large-size composite material U-shaped cross-section rotary body part forming mold, characterized in that:

[0025] The lengths of the core plates and the side plates of the split bodies are different, and the core plates and the side plates of adjacent split bodies are staggered.

[0026] Thus, the core plate and the side plate of the adjacent petals can be engaged with each other, and the strength of the overall structure is increased.

[0027] The large-size composite material U-shaped section rotary body part forming die according to the present application has the following characteristics:

[0028] The number of the petals is 8-12.

[0029] Thus, different numbers of petals can be set according to different products.

[0030] The large-size composite material U-shaped section rotary body part forming die according to the present application has the following characteristics:

[0031] The non-molding plate of the core plate is a hollow structure.

[0032] The large-size composite material U-shaped section rotary body part forming die according to the present application has the following characteristics:

[0033] The non-molding side of the core plate and the side plate is provided with a reinforcing rib.

[0034] Thus, the structural strength of the core plate and the side plate can be increased.

[0035] The large-size composite material U-shaped section rotary body part forming die according to the present application has the following characteristics: the lower surface of the two ends of the top of the core plate is formed with a stepped clamping groove which can cooperate with the top end of the side plate.

[0036] Thus, the top end of the side plate can be supported laterally by the side surface of the stepped clamping groove, and the deformation of the side plate is prevented. When demolding, the top end of the side plate can first move downward and then move inward to the lower surface of the stepped clamping groove, and space is reserved for the side plate to move inwardly.

[0037] The large-size composite material U-shaped section rotary body part forming die according to the present application has the following characteristics:

[0038] The overall structure of the composite material U-shaped section rotary body part forming die is annular and rotary, the length is 3000-4000mm, the width is 2000-3000mm, the U-shaped section height of the rotary body, i.e. the opening depth, is 400-800mm, and the U-shaped opening width is 300-600mm.

[0039] The present application further provides a large-size composite material U-shaped section rotary body part forming die forming method, which has the following characteristics:

[0040] The U-shaped rotary body forming die is used to lay carbon fiber composite material prepreg on the outside of the side plate, and then the product is formed by hot tank bag pressure molding, after the molding is completed, the mold stripping plate under the side plate is unlocked and removed, so that the side plate falls to the bottom plate, the top of the side plate is separated from the stepped clamping groove side, a pushing force is applied to the bottom of the side plate to push the side plate to the core plate side, at this time the side plate is completely separated from the side wall of the product, and the formed U-shaped cross-section rotary body component product can be taken off from the core plate,

[0041] The formed U-shaped cross-section rotary body component is a large-size annular U-shaped cavity, one end is open, and the rotary body peripheral wall is a carbon fiber composite material rotary body structure.

[0042] According to the forming method of the large-size composite material U-shaped cross-section rotary body component forming die, the U-shaped cross-section rotary body component is formed by hot tank bag pressure carbon fiber composite material prepreg,

[0043] The U-shaped cross-section rotary body component is formed by hot tank bag pressure carbon fiber composite material prepreg,

[0044] The carbon fiber prepreg is laid on the entire annular U-shaped cross-section rotary body die peripheral side, that is, the top of the core plate and the outside of the two side plates, and a flexible isolation film is covered, and in a hot pressure environment, the hot tank and vacuum system are used for curing, and after curing, the entire annular U-shaped cross-section carbon fiber rotary body peripheral wall component is formed, and the thickness of the formed carbon fiber rotary body peripheral wall is 3-5mm.

[0045] According to the forming method of the large-size composite material U-shaped cross-section rotary body component forming die, the U-shaped cross-section rotary body component is formed by hot tank bag pressure carbon fiber composite material prepreg,

[0046] The demolding method is as follows:

[0047] Step one, after the product is processed, the mold stripping plate is unlocked, and the mold stripping plate is pulled out from the side;

[0048] Step two, after the mold stripping plate is pulled out, the side plate naturally falls, the top end is separated from the stepped clamping groove of the core plate, and the bottom of the side plate is pushed to be close to the core plate by using a tool, and the side plate is separated from the inner side wall of the product;

[0049] Step three, after the side plate is separated from the product, the product is only in contact with the top end of the core plate, a pushing force is applied from below the product to separate the product from the top of the core plate, and the demolding is completed.

[0050] Therefore, rapid demolding and convenient disassembly can be realized,

[0051] According to the bag pressure forming process of the application,

[0052] 1. Higher fiber content laminates can be achieved; 2. Lower void content in carbon fiber composite articles; 3. Better wet-out of fibers due to pressure and resin flow in the structural fibers, excess fibers into the bag material; 4. Vacuum bag reduces amount of volatiles released during cure, higher safety.

[0053] The beneficial effects of the present application are: the mold adopts inner and outer splayed non-uniform symmetrical structure, each component can be disassembled and processed separately, realizes the bag pressure forming of large size U-shaped rotary body structure autoclave, and the mold is convenient to disassemble and assemble, reliable in connection, large in rigidity, small in deformation and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 It is a schematic diagram of the overall structure of the mold of the present application.

[0055] Figure 2 It is a schematic diagram of the core plate structure.

[0056] Figure 3 It is a schematic diagram of the ejector plate structure.

[0057] Figure 4 It is a schematic diagram of the bottom surface structure of the bottom plate.

[0058] Figure 5 It is a schematic diagram of the U-shaped cross-sectional structure.

[0059] Figure 6 It is a schematic diagram of the first step of the demolding method.

[0060] Figure 7 It is a schematic diagram of the second step of the demolding method.

[0061] Figure 8 It is a schematic diagram of the third step of the demolding method.

[0062] Wherein 1 is the bottom plate, 2 is the ejector plate, 3 is the side plate, 4 is the core plate, 3-1 is the side plate reinforcing rib, 4-1 is the stepped clamping groove, and 4-2 is the core plate reinforcing rib. DETAILED DESCRIPTION

[0063] Example 1

[0064] In the following, taking a U-shaped rotary body forming mold as an example, the design and preparation technology of the present application are further described in detail through examples.

[0065] A large-size composite material U-shaped cross-section rotary body component forming mold, comprising: a base (plate), an annular forming structure arranged on the bottom plate.

[0066] The forming structure comprises: an annular arrangement, a core plate that can be locked on the bottom plate, a top part forming a U-shaped cross-section rotary body component top forming surface, and a support,

[0067] The stripper plates arranged on both sides of the core plate and lockable on the base plate are used for stripping,

[0068] The side plates arranged on both sides of the core plate, the top of which cooperates with the top forming surface of the core plate, the outer side surface of which forms a U-shaped cross-section rotary body part, and the bottom of which is provided with a mounting plate and is lockable on the stripper plate;

[0069] The stripper plate, the core plate and the side plate are in a split (segment) structure, wherein a group of segments includes a core plate and its corresponding two side plates and a plurality of stripper plates at the lower part of the side plate, the segments are in an inside-out eight-shaped structure, and the forming structure is symmetrically split on the left and right sides.

[0070] Therefore, the core plate, the side plate and the stripper plate can be combined into a ring-shaped forming structure, and the inside-out eight-shaped structure of the segments can ensure that the overall structure is firm and stable. When the mold works in a high-temperature environment, the split structure can disperse stress and avoid stress concentration in the bending part, effectively reducing the deformation of the mold and improving the production precision.

[0071] In the embodiment, the base plate is in an overall structure, the center is hollow, and the bottom side adopts a reinforcing rib structure. Therefore, the weight of the mold can be reduced while the structural strength of the base plate is increased.

[0072] According to the large-size composite U-shaped cross-section rotary body part forming mold, first, the size of the mold (the base plate, the stripper plate, the core plate and the side plate) is calculated according to the physical size of the product and the allowable deformation amount, and the overall mold structure is determined according to the requirements of the autoclave forming.

[0073] In the symmetrically split stripper plate structure on the left and right sides of the forming mold, the height of one segmental stripper plate is slightly lower than that of the other stripper plates.

[0074] Therefore, the mold can be disassembled from the lower stripper plate, and the disassembly is more convenient.

[0075] In the embodiment, the core plate is in an I-shaped structure with a wide upper part and a narrow lower part, and the narrow bottom part is lockable on the base, and the wide top part forms a top forming surface.

[0076] In the embodiment, the lengths of the core plates and the side plates of the segments are different, and the core plates and the side plates of adjacent segments are staggered. Therefore, the core plates and the side plates of adjacent segments can be engaged with each other, and the strength of the overall structure is increased. The number of segments is 8-12.

[0077] Therefore, different numbers of segments can be set according to different products.

[0078] In the embodiment, the non-molding plate of the core plate is in a hollow structure, and the non-molding side of the core plate and the side plate is provided with a reinforcing rib.

[0079] Thus, the structural strength of the core plate and the side plate can be increased.

[0080] In the embodiment, the lower surfaces of the two ends of the top of the core plate are formed with stepped clamping grooves which can cooperate with the top ends of the side plates.

[0081] Thus, the top ends of the side plates can be supported laterally by the side surfaces of the stepped clamping grooves, so that the side plates are not deformed, and when the product is demolded, the top ends of the side plates can first move downward and then move inward to the lower surfaces of the stepped clamping grooves, so that space is reserved for the side plates to move inward and be separated from the product.

[0082] In the embodiment, the overall structure of the composite U-shaped cross-section rotary body component forming die is annular rotary, with a length of 3000-4000 mm, a width of 2000-3000 mm, a U-shaped cross-section height (i.e. opening depth) of 400-800 mm, and a U-shaped opening width of 300-600 mm.

[0083] Using the above U-shaped rotary body forming die, carbon fiber composite material prepreg is laid on the outside of the side plates, and then the product is formed by bag pressing in a hot press, after the forming is completed, the stripper plates below the side plates are all unlocked and removed, so that the side plates fall to the bottom plate and the top of the side plates is separated from the side surface of the stepped clamping groove, a pushing force is applied to the bottom of the side plates to push the side plates close to the core plate, at this time, the side plates are completely separated from the side wall of the product, and the formed U-shaped cross-section rotary body component product can be taken off from the core plate.

[0084] The formed U-shaped cross-section rotary body component is a large-size annular structure with a U-shaped cavity inside and an opening at one end, and the rotary body peripheral wall is a carbon fiber composite material rotary body structure.

[0085] In the embodiment, the carbon fiber rotary body peripheral wall component with an overall annular U-shaped cross-section is formed after curing, and the thickness of the formed carbon fiber rotary body peripheral wall is 3-5 mm.

[0086] The demolding method is as follows:

[0087] Step one: after the product is processed, the stripper plates are all unlocked and pulled out from the side;

[0088] Step two: after the stripper plates are pulled out, the side plates naturally fall down, the top ends are separated from the stepped clamping grooves of the core plate, and the bottom of the side plates is pushed to be close to the core plate by using a tool so as to be separated from the inner side wall of the product;

[0089] Step three: after the side plates are separated from the product, the product is only in contact with the top end of the core plate, a pushing force is applied from below the product to separate the product from the top of the core plate, and the demolding is completed. Thus, rapid demolding can be realized, and the disassembly and assembly are convenient.

[0090] According to the application, the mold adopts an inner-outer splayed non-uniform symmetrical structure, each component part can be disassembled and processed individually, large-size U-shaped rotary body structure hot press tank bag compression molding is realized, and the mold is convenient to disassemble and assemble, reliable in connection, large in rigidity, small in deformation and low in cost.

Claims

1. A large-size composite material U-shaped cross-section rotary body component forming mold, characterized in that it comprises: a bottom plate, an annular forming structure arranged on the bottom plate, the forming structure comprising: an annularly arranged core plate lockable on the bottom plate, a top forming a top forming surface of the U-shaped cross-section rotary body component, and a support plate, a stripper plate arranged on both sides of the core plate and lockable on the bottom plate, a side plate arranged on both sides of the core plate, the top of which cooperates with the top forming surface of the core plate, the outer side of which forms a side forming surface of the U-shaped cross-section rotary body component, and the bottom of which is provided with a mounting plate and is lockable on the stripper plate, the stripper plate, the core plate and the side plate are split structure, wherein a set of petals comprises a core plate and its corresponding two side plates and a plurality of stripper plates at the lower part of the side plate, the petals are in an inside-out eight-shaped structure, and the forming structure is symmetrically split on the left and right sides.

2. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the bottom plate is in an integral structure, the center is hollow, and the bottom side adopts a reinforcing rib structure.

3. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the mold sizes of the bottom plate, the stripper plate, the core plate and the side plate are calculated according to the physical size of the product and the allowable deformation amount, and the overall mold structure is determined according to the requirements of the autoclave forming.

4. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the height of one petal-shaped stripper plate is slightly lower than that of the other stripper plates in the symmetrically split structure of the stripper plates on the left and right sides of the forming mold.

5. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the core plate is in an I-shaped structure with a wide top and a narrow bottom, and the narrow bottom is lockable on the bottom plate, and the wide top forms a top forming surface.

6. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the lengths of the core plates and the side plates of the petals are different, and the core plates and the side plates of adjacent petals are arranged staggered.

7. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the number of the petals is 8-12.

8. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the non-molding plate of the core plate is in a hollow structure.

9. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the non-molding sides of the core plate and the side plate are provided with reinforcing ribs, and the lower surface of both ends of the top of the core plate forms a stepped clamping groove which can cooperate with the top end of the side plate.

11. The large-size composite material U-shaped cross-section rotary body component forming mold according to claim 1, characterized in that the overall structure of the composite material U-shaped cross-section rotary body component forming mold is annularly rotary, the length is 3000-4000 mm, the width is 2000-3000 mm, the height of the U-shaped cross-section of the rotary body, i.e. the opening depth, is 400-800 mm, and the opening width of the U-shaped cross-section is 300-600 mm. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. A forming mold for large size composite U-section swivel parts according to claim 1, characterized in that: ​ ​ ​ 12. A forming method of a large-size composite U-shaped cross-section rotary body component forming mold, using the large-size composite U-shaped cross-section rotary body component forming mold according to any one of claims 1-11, characterized in that: The U-shaped rotary body forming mold is used to lay carbon fiber composite prepreg on the outside of the side plate, and then the product is formed by bag pressing of the autoclave. After the forming is completed, the mold release plate under the side plate is unlocked and removed, so that the side plate falls to the bottom plate, the top of the side plate is separated from the side of the stepped clamping groove, and a pushing force is applied to the bottom of the side plate to push it close to the core plate. At this time, the side plate is completely separated from the side wall of the product, and the formed U-shaped cross-section rotary body component product can be taken off the core plate, The formed U-shaped cross-section rotary body component is a large-size annular U-shaped cavity structure with one end open, and the rotary body peripheral wall is made of carbon fiber composite material.

13. The forming method of the large-size composite U-shaped cross-section rotary body component forming mold according to claim 12, characterized in that: The U-shaped cross-section rotary body component is formed by bag pressing of the autoclave carbon fiber composite prepreg, The carbon fiber prepreg is laid on the entire annular U-shaped cross-section rotary body mold peripheral side, i.e. the top of the core plate and the outside of the two side plates, and a flexible isolation film is covered. In a hot pressing environment, the autoclave and vacuum system are used for curing, and after curing, the entire annular U-shaped cross-section carbon fiber rotary body peripheral wall component is formed, and the formed carbon fiber rotary body peripheral wall thickness is 3-5 mm.

14. The forming method of the large-size composite U-shaped cross-section rotary body component forming mold according to claim 12, characterized in that: The demolding method is as follows: Step one, after the product is processed, unlock the mold release plate and pull it out from the side; Step two, after the mold release plate is pulled out, the side plate naturally falls, the top end is separated from the stepped clamping groove of the core plate, and the bottom of the side plate is pushed to make it close to the core plate and separate from the inner side wall of the product; Step three, after the side plate is separated from the product, the product is only in contact with the top end of the core plate, a pushing force is applied from below the product to separate it from the top of the core plate, and the demolding is completed.

Images