CN115847671A - Die for forming large fairing and processing method - Google Patents
Die for forming large fairing and processing method Download PDFInfo
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- CN115847671A CN115847671A CN202211508892.7A CN202211508892A CN115847671A CN 115847671 A CN115847671 A CN 115847671A CN 202211508892 A CN202211508892 A CN 202211508892A CN 115847671 A CN115847671 A CN 115847671A
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Abstract
The invention provides a die for forming a large fairing and a processing method thereof, wherein the die comprises a main die, wherein the outer bottom of the main die is provided with a plurality of supporting points; the enclosing strip is fixed on the inner wall of the main body die along the outer contour of the product, the window core die is tightly installed on the inner wall of the main body die, the silicon rubber ring is sleeved on the window core die, and a plurality of air nozzles are uniformly distributed on the periphery of the main body die; the demoulding embedded part is arranged on the course demoulding side of the main body mould, the demoulding component is detachably connected with the demoulding embedded part, and the demoulding component enables a product to be demoulded along the course. Through the cooperation of the demoulding assembly and the demoulding embedded part, the product course demoulding is realized, the damage to the product caused by the uncontrollable demoulding force of the vertical lifting of a travelling crane is avoided, the window core mould is made of aluminum alloy, the window core mould is separated from the main body mould along with the product in the demoulding stage, the window core mould is separated from the product, and the demoulding success rate is improved.
Description
Technical Field
The invention relates to the technical field of mold design, in particular to a mold for forming a large fairing and a processing method.
Background
The carrier rocket fairing is an important component of the carrier rocket, plays a role in protecting the satellite and preventing the satellite from being influenced by harmful environments such as aerodynamic force, pneumatic heating, sound vibration and the like. The traditional rocket fairing is made of aluminum alloy or glass fiber reinforced plastic skin and an aluminum alloy framework, the fairing in the form is heavy in weight and cannot realize a wave-transmitting function, different wave-transmitting windows need to be formed according to different satellites, and inconvenience is brought to model development.
Therefore, the existing fairing adopts a honeycomb sandwich structure form, wherein an inner panel and an outer panel adopt glass fiber cloth reinforced composite materials, and aramid paper honeycombs are filled between the inner panel and the outer panel.
The large rocket fairing consists of a cylinder section, a Feng Ka door section and a ball head section, and the current development method adopts a development method that three parts are respectively and independently formed and then integrally assembled. The method still needs a plurality of moulds, the development cost and the development period are still longer, and the overall precision of the cover body is influenced by the assembly of the three parts, so that the novel fairing with the integrally formed barrel section, feng Ka door section and ball head section is formed. The integrally formed cover body only needs one forming die without assembly, so that the development cost and the development period of a product are greatly reduced, and the integral precision of the cover body is improved due to integral forming.
The existing Chinese patent application with the publication number of CN112123813A discloses a co-curing forming tool of a large-size arc-shaped deformation rectangular-section honeycomb sandwich structure, an upper die, a lower die and lower die side blocks are connected and assembled through positioning pins, the upper die, the lower die and the lower die side blocks jointly form a forming female die, in the forming female die, the upper die and the lower die, the lower die and the lower die side blocks and the upper die and the lower die side blocks are further sealed through sealing rubber grooves, and the upper die, the lower die and the lower die side blocks are made of cast iron materials.
The fairing mould in the prior art has the following defects:
1. the size and the weight of the forming die are very large, which causes the transfer of the die to be very inconvenient, the heat capacity of the die is too large, the temperature rise is slow, the distribution of the integral temperature field of the die is not uniform, and the profile degree of the die surface is easily influenced by the field.
2. Because whole cover is open structure, if the product is according to conventional vertical direction drawing of patterns, the side component that the hoist produced can make the product have the binding off trend, and the driving is lifted by crane and can be produced uncontrollable release force, further increases the risk of damaging the product among the drawing of patterns process
3. The surface area of the whole cover is large, the final demolding force of a product can be greatly improved by the friction force, the mold sticking force and the local gas blocking in the demolding process, the product does not have a reserved demolding acting point, and if the hoisting hole is drilled in the allowance position of the product blank by adopting a conventional method, the position of the hoisting hole of the product can be damaged due to the fact that the excessive demolding shearing force cannot be borne, and finally demolding failure is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a die and a processing method for forming a large fairing.
The invention provides a mould for forming a large fairing, which comprises a main body mould, a surrounding strip, an air tap, a window core mould, a silicon rubber ring, a demoulding embedded part and a demoulding assembly, wherein the main body mould is provided with a plurality of grooves; a plurality of supporting points are arranged at the outer bottom of the main body mould, a transfer supporting plate is further arranged at the outer bottom of the main body mould, and a hoisting rod is arranged on the outer peripheral side of the main body mould; the enclosing strip is fixed on the inner wall of the main body die along the outer contour of the product, the window core die is tightly mounted on the inner wall of the main body die, the silicon rubber ring is sleeved on the window core die, and a plurality of air nozzles are uniformly distributed on the periphery of the main body die; the demolding embedded part is installed on the course demolding side of the main body mold, the demolding embedded part and the product are solidified together, the demolding assembly is detachably connected with the demolding embedded part, and the demolding assembly enables the product to be demolded along the course.
Preferably, the main body die comprises a barrel section, a von karman section and a ball head section which are arranged in sequence; the main body mould comprises a profile plate and a frame structure, wherein the inner surface of the profile plate forms the inner wall of the main body mould, and the frame structure is connected to the outer surface of the profile plate.
Preferably, the strong point, the transportation backup pad and the hoisting rod three all set up on frame construction, just the gusset density of the frame construction of strong point, transportation backup pad and hoisting rod three position department is encrypted, thickness thickening.
Preferably, vent holes are formed in rib plates of the frame structure, and target holes are formed in the periphery of the main body die.
Preferably, the support points are symmetrically arranged on the main body mould by using the gravity center of the main body mould, and at least three support points are arranged at the bottom of the main body mould; the hoisting rod is symmetrically arranged on the main body mould by using the gravity center of the main body mould.
Preferably, the surrounding strip forms a space for installing a demoulding embedded part at the demoulding side of the main body mould, and a transition chamfer is arranged at one side of the demoulding embedded part close to the product.
Preferably, the demoulding assembly comprises a screw, a supporting plate and a nut, wherein the screw thread penetrates through the supporting plate, and the nut is installed at one end of the screw in a threaded fit manner.
Preferably, the material of the window mandrel comprises an aluminum alloy.
Preferably, the demolding heading is in the axial direction of the main body mold.
According to the processing method of the die for forming the large fairing, which is provided by the invention, the processing method comprises the following steps: s1, fixing a surrounding strip on the inner wall of a main body mould along the outer contour of a product, and forming a space for installing a demoulding embedded part on the demoulding side of the main body mould; s2, placing the aramid fiber paper honeycomb on the inner surface of the main body mold for curing and shaping, and cutting the shape of the shaped paper honeycomb by machining after demolding; s3, installing demolding embedded parts, uniformly arranging air nozzles around a main body mold, fixedly installing a window core mold on the main body mold, and sleeving a silicon rubber ring on the window core mold; s4, performing layering operation on the main body mould by referring to laser projection and angular scribed lines, firstly laying an outer skin, placing the cured and shaped aramid fiber paper honeycomb after laying, and finally laying an inner skin; s5, making a bag on the mold, and curing; s6, after solidification, the fixing piece is detached, the demolding assembly is connected with the demolding embedded piece, and the demolding embedded piece is pulled to carry out course demolding.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, through the matching of the demoulding component and the demoulding embedded part, the course demoulding of the product is realized, the damage of the uncontrollable demoulding force caused by the vertical lifting of a travelling crane to the product is avoided, and the window core mould is made of aluminum alloy, so that the window core mould is favorably separated from the main body mould along with the product in the demoulding stage, the window core mould is favorably separated from the product, and the success rate of demoulding is favorably improved.
2. According to the invention, through the vent holes formed in the rib plate of the main body die, the weight can be reduced, and high-temperature air flow in the hot-pressing tank can pass through the vent holes to rapidly and uniformly heat the die, so that the whole temperature field of the die can be uniformly distributed, and the thermal stress of the product caused by nonuniform temperature distribution is avoided.
3. According to the invention, the main body die is of a welding structure, and the profile plate is thin and uniform in thickness, so that the heat capacity of the die is small, and the heating rate is high.
4. According to the invention, through the three supporting points arranged at the bottom of the main body mould, stress points of the mould can be kept consistent without being influenced by fields, so that the profile degree of the mould surface is kept consistent in different fields.
5. According to the invention, the supporting points of the main body mould and the hoisting rods are symmetrically arranged relative to the gravity center of the mould, so that the mould can be kept balanced in the transferring and hoisting process, and safety accidents caused by the inclination of the mould in the hoisting process can be avoided.
6. The invention leads the product to have firm demoulding acting point through the demoulding embedded part which is co-cured with the product.
7. The invention can improve the bag making efficiency by connecting the air nozzle and the main body mould into a whole.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the overall structure of a main body mold according to the present invention;
FIG. 2 is a schematic view of the bottom structure of the main body mold according to the present invention;
FIG. 3 is a schematic view of the periphery of the frame structure according to the present invention;
FIG. 4 is a schematic view of the overall structure of a stripper assembly embodying the invention;
FIG. 5 is a schematic view of the overall structure of a demolded insert embodying the invention;
fig. 6 is a schematic view of a silicone rubber ring mounting structure according to the present invention.
Shown in the figure:
Supporting plate 71 of target hole 14
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, 2, 3, 4, 5 and 6, the mold for forming a large fairing according to the present invention includes a main body mold 1, a surrounding strip 2, a gas nozzle 3, a window core mold 4, a silicone rubber ring 5, a demolding insert 6 and a demolding assembly 7. The outer bottom of main part mould 1 is provided with a plurality of strong points 11, and the outer bottom of main part mould 1 still is provided with transports backup pad 13, and the periphery side of main part mould 1 is provided with hoist and mount pole 12. The foxing 2 is fixed on the inner wall of the main body mould 1 along the outline of the product, the window core mould 4 is tightly installed on the inner wall of the main body mould 1, the silicon rubber ring 5 is sleeved on the window core mould 4, and the air nozzles 3 are uniformly distributed on the periphery of the main body mould 1. The demolding embedded part 6 is arranged on the course demolding side of the main body mold 1, the demolding embedded part 6 and a product are solidified together, the demolding component 7 is detachably connected with the demolding embedded part 6, and the demolding component 7 enables the product to be demolded along the course.
Specifically, the main body mold 1 includes a barrel section, a von karman section, and a ball head section, which are sequentially arranged, the main body mold 1 includes a molding plate and a frame structure, an inner surface of the molding plate forms an inner wall of the main body mold 1, and the frame structure is connected to an outer surface of the molding plate. The frame structure is formed by matching horizontal rib plates, vertical rib plates, inclined rib plates and reinforcing rib plates. And the supporting point 11, the transferring supporting plate 13 and the hoisting rod 12 are all arranged on the frame structure, and the rib plates of the frame structure at the positions of the supporting point 11, the transferring supporting plate 13 and the hoisting rod 12 are dense and thick.
The main body die 1 is of an integral welding structure, the profile plate is a steel plate, the thickness of the profile plate is 15mm, and the thickness of the rib plate is 10mm. The rib plate of the frame structure is provided with vent holes 15, and the periphery of the main body die 1 is provided with target holes 14. Because the thickness of the molding panel is thin and uniform, the heat capacity of the mold is small, and the heating rate is high. The ventilation holes 15 on the rib plates can not only reduce the weight, but also enable high-temperature air flow in the hot-pressing tank to pass through the ventilation holes 15, so that the die is heated quickly and uniformly, the temperature field of the whole die can be uniformly distributed, and the thermal stress of the product due to nonuniform temperature distribution is avoided.
Furthermore, the supporting points 11 are symmetrically arranged on the main body mold 1 with the center of gravity of the main body mold 1, at least three supporting points 11 are arranged at the bottom of the main body mold 1, and the hoisting rods 12 are symmetrically arranged on the main body mold 1 with the center of gravity of the main body mold 1.
One possible implementation of the present application is: three strong point 11 of main part mould 1 bottom welding, four hoisting rod 12 of main part mould 1's side welding, the mould is transported the accessible and is lifted by crane hoisting rod 12 and transport, also can support through the forklift and transport backup pad 13 and transport, perhaps transports through backing up the ground tank in transporting backup pad 13 bottom. Target holes 14 are uniformly distributed on the main body mould 1 along the product contour for placing a target in later stage laser projection, and the product scribing line is carved on the molded surface of the main body mould 1 and a layering angle scribing line is carved.
Three strong points 11 that main graph mould bottom was arranged can make the stress point of mould not influenced by the place and remain unanimous all the time to guarantee that the profile degree of main part mould 1 remains unanimous all the time in different places. The supporting points 11 of the main body die 1 and the lifting rods are symmetrically arranged relative to the gravity center of the main body die 1, so that the main body die 1 can be kept balanced in the transferring and hoisting process, and safety accidents caused by the inclination of the main body die 1 in the hoisting process can be avoided.
The surrounding strip 2 is fixed on the main body mould 1 along the outer contour of the product, and the surrounding strip 2 is provided with a glue overflow groove. The foxing 2 takes off the side at the navigation of main part mould 1 and forms the space of installation demolding and buries piece 6, and the one side that the piece 6 is close to the product is buried in the drawing of patterns is provided with the transition chamfer, can avoid the product to spread the layer and appear the bridge, guarantees the product compaction, and the one side that the piece 6 deviates from the product is seted up threaded hole and is used for dismantling connection drawing of patterns subassembly 7 in the drawing of patterns. Two release inserts 6 are provided symmetrically with respect to the central axis of the main body mold 1 on the release side of the main body mold 1. The material of the window plug 4 comprises an aluminium alloy. The demolding course is the axial direction of the main body mold 1, the product can be demolded along the course, and the phenomenon that the product is subjected to closing deformation due to demolding in the vertical direction is avoided.
Preferably, the main body mold 1, the surrounding strips 2, the air nozzles 3 and the demolding embedded parts 6 are made of Q235, and the window core mold 4 is made of aluminum alloy 2A12. Since the aluminum alloy has a lower density and a larger linear expansion coefficient, it is advantageous to separate the window core mold 4 from the main body mold 1 together with the product and also to separate the window core mold 4 from the product at the stage of demolding. The air nozzle 3 is connected with the main body mould 1 into a whole, so that the bag making efficiency can be improved.
The demoulding assembly 7 comprises a screw 72, a supporting plate 71 and a nut 73, wherein the screw 72 is threaded through the supporting plate 71, and the nut 73 is installed at one end of the screw 72 in a threaded fit mode.
According to the processing method for forming the large fairing, which is provided by the invention, the processing method comprises the following steps:
s1, fixing the surrounding strip 2 on the inner wall of the main body mould 1 along the outer contour of a product, and forming a space for installing a demoulding embedded part 6 on the demoulding side of the main body mould 1.
S2, placing the aramid fiber paper honeycomb on the inner surface of the main body die 1 for curing and shaping, and cutting the shape of the shaped paper honeycomb by machining after demoulding.
S3, installing demolding embedded parts 6, uniformly distributing air nozzles 3 around the main body mold 1, fixedly installing a window core mold 4 on the main body mold 1, and sleeving a silicon rubber ring 5 on the window core mold 4. The window core mold 4 is positioned by a pin and fastened to the main body mold 1 at a designated position, which is a window position of the product, by a screw. The silicone rubber ring 5 provides lateral pressure on the product window location during product curing.
And S4, laying layers on the main body mould 1 according to laser projection and laying angle scribed lines, laying an outer skin, placing the cured and shaped aramid fiber paper honeycomb after laying, and laying an inner skin. Specifically, after all parts are installed, laying layers on the main body die 1 according to laser projection and laying angle scribed lines, laying an outer skin firstly, placing cured and shaped aramid paper honeycombs after laying, laying an inner skin again, and integrally laying and wrapping the demolding embedded part 6 on the position of the allowance of a product blank in the process.
And S5, making a bag on the mold, and curing. Specifically, after layering is finished, a bag is made on a mold, the air felt is required to cover 3 holes of the air nozzle, the sealing rubber strip is attached to the outer side of the 3 holes of the air nozzle, and the bag is pressurized and cured in an autoclave.
S6, after the solidification is finished, the fixing piece is removed, the demolding component 7 is connected with the demolding embedded piece 6, and the demolding embedded piece 6 is pulled to perform course demolding. After solidification is finished, all pins, screws and silicon rubber blocks are removed, the demoulding component 7 is connected with the demoulding embedded part 6, the nut 73 in the demoulding component 7 is manually screwed to enable the screw rod 72 to be connected with the threaded hole of the demoulding embedded part 6, then the demoulding embedded part 6 is pulled to move towards the course, the window core mould 4 is demoulded along the course along with the product, and after the product is separated from the main body mould 1, the window core mould 4 is separated from the product.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A mould for forming a large fairing is characterized by comprising a main body mould (1), a surrounding strip (2), an air tap (3), a window core mould (4), a silicon rubber ring (5), a demoulding embedded part (6) and a demoulding component (7);
a plurality of supporting points (11) are arranged at the outer bottom of the main body die (1), transfer supporting plates (71) (13) are further arranged at the outer bottom of the main body die (1), and hoisting rods (12) are arranged on the outer peripheral side of the main body die (1);
the surrounding strips (2) are fixed on the inner wall of the main body die (1) along the outer contour of a product, the window core die (4) is tightly mounted on the inner wall of the main body die (1), the silicone rubber ring (5) is sleeved on the window core die (4), and a plurality of air nozzles (3) are uniformly distributed on the periphery of the main body die (1);
the demolding embedded part (6) is installed on the course demolding side of the main body mold (1), the demolding embedded part (6) and a product are solidified together, the demolding component (7) is detachably connected with the demolding embedded part (6), and the demolding component (7) enables the product to be demolded along the course.
2. The mold for large fairing molding according to claim 1, characterized in that the main body mold (1) comprises a barrel section, a von karman section and a ball head section arranged in this order;
the main body mould (1) comprises a profile plate and a frame structure, wherein the inner surface of the profile plate forms the inner wall of the main body mould (1), and the frame structure is connected to the outer surface of the profile plate.
3. The mold for molding the large fairing according to claim 2, wherein the supporting points (11), the transferring supporting plate (13) and the hoisting rods (12) are all arranged on the frame structure, and rib plates of the frame structure at the positions of the supporting points (11), the transferring supporting plate (13) and the hoisting rods (12) are dense and thick.
4. The mold for molding the large fairing according to claim 2, wherein the rib plate of the frame structure is provided with a vent hole (15), and the periphery of the main body mold (1) is provided with target holes (14).
5. The mold for large fairing molding as recited in claim 1, wherein said support points (11) are symmetrically disposed on the main body mold (1) with respect to the center of gravity of the main body mold (1), and said support points (11) are disposed at least three at the bottom of the main body mold (1);
the hoisting rods (12) are symmetrically arranged on the main body die (1) by using the gravity center of the main body die (1).
6. The mould for forming large fairings according to claim 1, characterized in that the surrounding strip (2) forms a space for mounting the demolding insert (6) at the demolding side of the main body mould (1), and the demolding insert (6) is provided with a transition chamfer at the side close to the product.
7. The mold for molding a large size cowl according to claim 1, wherein the mold release assembly (7) comprises a screw (72), a stay plate (71), and a nut (73), the screw (72) is threaded through the stay plate (71), and the nut (73) is threadedly fitted to one end of the screw (72).
8. Mould for forming large fairings according to claim 1, characterized in that the material of the window core (4) comprises an aluminium alloy.
9. Mould for the moulding of large fairings according to claim 1, characterized in that the demoulding course is axial of the main mould (1).
10. A method for forming a large size cowl, characterized in that the mold for forming a large size cowl according to any one of claims 1 to 9 is used, and the method comprises the steps of:
s1, fixing a surrounding strip (2) on the inner wall of a main body mould (1) along the outer contour of a product, and forming a space for installing a demoulding embedded part (6) on the aerial demoulding side of the main body mould (1);
s2, placing the aramid fiber paper honeycomb on the inner surface of the main body die (1) for curing and shaping, and cutting the shape of the shaped paper honeycomb by machining after demolding;
s3, installing demolding embedded parts (6), uniformly arranging the air nozzles (3) around the main body mold (1), fixedly installing a window core mold (4) on the main body mold (1), and sleeving a silicone rubber ring (5) on the window core mold (4);
s4, performing layer laying operation on the main body die (1) by referring to laser projection and laying of angled scribed lines, laying an outer skin, placing the cured and shaped aramid paper honeycomb after laying, and laying an inner skin;
s5, making bags on the die, and curing;
s6, after solidification, the fixing piece is removed, the demolding component (7) is connected with the demolding embedded piece (6), and the demolding embedded piece (6) is pulled to perform course demolding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211508892.7A CN115847671A (en) | 2022-11-29 | 2022-11-29 | Die for forming large fairing and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211508892.7A CN115847671A (en) | 2022-11-29 | 2022-11-29 | Die for forming large fairing and processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115847671A true CN115847671A (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211508892.7A Pending CN115847671A (en) | 2022-11-29 | 2022-11-29 | Die for forming large fairing and processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115847671A (en) |
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2022
- 2022-11-29 CN CN202211508892.7A patent/CN115847671A/en active Pending
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