CN115847671A - Die for forming large fairing and processing method - Google Patents

Abstract

The invention provides a mold for forming a large fairing and a processing method, comprising a plurality of supporting points on the outer bottom of the main mold, a transfer support plate on the outer bottom of the main mold, and a hoisting device on the outer peripheral side of the main mold. Rod; the surrounding bar is fixed on the inner wall of the main mold along the outer contour of the product, the window mandrel is fastened on the inner wall of the main mould, the silicone rubber ring is set on the window mandrel, and the air nozzles are evenly distributed on the periphery of the main mould. The demoulding embedded part is installed on the demoulding side of the main mold, the demoulding component and the demoulding embedded part are detachably connected, and the demoulding component makes the product demould along the course. Through the cooperation of the demoulding components and the demoulding embedded parts, the demoulding of the product direction is realized, and the uncontrollable demoulding force caused by the vertical lifting of the crane is avoided to cause damage to the product, and the material of the window mandrel is aluminum alloy, which is beneficial to the demoulding stage. The window mandrel is separated from the main mold along with the product, which is also conducive to the separation of the window mandrel from the product and helps to improve the success rate of demoulding.

Description

Mold and processing method for forming large fairing

technical field

The invention relates to the technical field of mold design, in particular to a mold and a processing method for forming a large fairing.

Background technique

The launch vehicle fairing is an important part of the launch vehicle, which protects the satellite and prevents the satellite from being affected by harmful environments such as aerodynamic force, aerodynamic heating, and acoustic vibration. The traditional rocket fairing material is aluminum alloy or FRP skin + aluminum alloy frame. This type of fairing is not only heavy but also unable to realize the wave-transmitting function. Different wave-transmitting windows need to be opened according to different satellites. Inconvenience has been caused.

Therefore, the current fairing adopts a honeycomb sandwich structure, in which the inner and outer panels are made of glass fiber cloth reinforced composite materials, and the inner and outer panels are filled with aramid paper honeycomb. The fairing with this structure reduces the cost of the mold and improves the product profile. Accurate, shorten the development cycle, usually adopt the method of co-curing of the skin and the honeycomb as a whole.

The large-scale rocket fairing is composed of a barrel section, a von Karman section and a ball head section. At present, the three parts are separately formed and then assembled as a whole. However, this method still requires multiple sets of molds, and the development cost and development cycle are still long, and because the three-part assembly affects the overall accuracy of the cover, a new type of rectifier with integral molding of the barrel section, von Karman section and ball head section has emerged. cover. The integrally formed cover body only needs a pair of forming molds and does not require assembly, which will greatly reduce the product development cost and development cycle. Due to the integral forming, the overall precision of the cover body will also be improved.

The existing Chinese patent application with the publication number CN112123813A discloses a co-curing molding tooling of a honeycomb sandwich structure with a large-scale arc-shaped variable rectangular cross-section. The upper mold, the lower mold, and the side blocks of the lower mold are connected and assembled by positioning pins. The upper mold, the lower mold, and the side blocks of the lower mold together form a forming female mold. In the forming female mold, the upper mold and the lower mold, the lower mold and the lower mold side pieces, and the upper mold and the lower mold side pieces are all passed through a sealant groove For further sealing, the upper mold, the lower mold, and the side block materials of the lower mold are all made of cast iron.

The fairing mold in the prior art has the following defects:

1. The size and weight of the forming mold are very large, which will lead to extremely inconvenient transfer of the mold, the heat capacity of the mold is too large and the temperature rises slowly, the overall temperature field of the mold is unevenly distributed, and the contour of the mold surface is easily affected by the site.

2. Since the overall cover is an open structure, if the product is demoulded along the vertical direction as usual, the lateral component force generated by the spreader will cause the product to close up, and the crane will produce uncontrollable demoulding force, which will further increase the demoulding force. Risk of product damage during molding

3. The surface area of the overall cover is large, and the friction force, mold sticking force and partial air holding during the demoulding process will greatly increase the final demoulding force of the product, and the product has no reserved demoulding point. If the conventional method is used on the product If the hoisting hole is punched at the position of the blank margin, the position of the hoisting hole of the product may be damaged because it cannot bear the excessive shearing force of demoulding, which will eventually lead to demoulding failure.

Contents of the invention

Aiming at the defects in the prior art, the object of the present invention is to provide a mold and a processing method for forming a large fairing.

According to the present invention, a mold for large-scale fairing molding is provided, which includes a main body mold, a skirt, an air nozzle, a window mandrel, a silicone rubber ring, a demoulding embedded part and a demoulding assembly; the outer bottom of the main body mold There are multiple support points, the outer bottom of the main mold is also provided with a transfer support plate, the outer peripheral side of the main mold is provided with a lifting rod; the surrounding bar is fixed on the inner wall of the main mold along the outer contour of the product, and the The window mandrel is fastened on the inner wall of the main body mould, the silicone rubber ring is set on the window mandrel, and a plurality of air nozzles are evenly distributed around the main mould; the demoulding embedded parts are installed on the main body The mold is heading toward the demoulding side, and the demoulding embedded part is solidified together with the product, the demoulding component is detachably connected with the demoulding embedded part, and the demoulding component makes the product demould along the course.

Preferably, the main body mold includes a barrel section, a von Karman section and a ball end section arranged in sequence; the main body mold includes a profile panel and a frame structure, the inner surface of the profile panel forms the inner wall of the main body mold, and the frame structure Attached to the outer surface of the panel.

Preferably, the support point, the transfer support plate and the lifting rod are all arranged on the frame structure, and the ribs of the frame structure at the positions of the support point, the transfer support plate and the lifting rod are denser in density and thicker in thickness. thick.

Preferably, ventilation holes are opened on the rib plate of the frame structure, and target holes are arranged around the main body mold.

Preferably, the support points are symmetrically arranged on the main mold with the center of gravity of the main mold, and at least three support points are arranged at the bottom of the main mold; the lifting rods are symmetrically arranged on the main mold with the center of gravity of the main mold set up.

Preferably, the surrounding bar forms a space for installing a demoulding embedment on the flyaway side of the main mold, and a transition chamfer is provided on the side of the demoulding embedment close to the product.

Preferably, the demoulding assembly includes a screw rod, a support plate and a nut, the screw rod is threaded through the support plate, and the nut is threadedly mounted on one end of the screw rod.

Preferably, the material of the window mandrel includes aluminum alloy.

Preferably, the demoulding direction is the axial direction of the main body mold.

According to the processing method of a mold used for forming a large fairing provided by the present invention, the processing method includes the following steps: S1, fixing the enclosure on the inner wall of the main mold along the outer contour of the product, and Form the space for installing demoulding embedded parts on the side; S2, put the aramid paper honeycomb on the inner surface of the main mold to solidify and shape, and after the shaped paper honeycomb is demoulded, cut out the shape by machining; Install the air nozzles evenly around the main mould, fix the window mandrel on the main mould, and put the silicone rubber ring on the window mandrel; Layer operation, laying the outer skin first, then placing the cured and shaped aramid paper honeycomb, and finally laying the inner covering; S5, making bags on the mold, and curing; S6, removing the fixing parts after curing, and putting The demoulding component is connected with the demoulding embedded part, and the demoulding embedded part is pulled for heading demoulding.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention cooperates with the demoulding component and the demoulding embedded part to realize the demoulding of the product direction, avoiding the uncontrollable demoulding force caused by the vertical lifting of the vehicle to cause damage to the product, and the material of the window mandrel is aluminum alloy, and the demoulding The stage is not only conducive to the separation of the window mandrel from the main mold along with the product, but also conducive to the separation of the window mandrel from the product, which helps to improve the success rate of demoulding.

2. The present invention can not only reduce the weight but also allow the high-temperature airflow in the autoclave to pass through the ventilation holes through the ventilation holes on the rib plate of the main mold, so as to heat the mold quickly and evenly, so that the overall temperature field of the mold can be Uniform distribution to avoid thermal stress of the product due to uneven temperature distribution.

3. In the present invention, the main mold is a welded structure, and the thickness of the molded panel is relatively thin and uniform, so that the heat capacity of the mold is small and the heating rate is fast.

4. Through the three support points arranged at the bottom of the main mold, the present invention can keep the stress point of the mold consistent regardless of the site, thereby ensuring that the profile of the mold surface is always consistent in different sites.

5. By symmetrically arranging the support points and lifting rods of the main mold relative to the center of gravity of the mold, the present invention can ensure that the mold remains balanced during the transfer and hoisting process, and can avoid safety accidents caused by the tilting of the mold during the hoisting process.

6. In the present invention, the demoulding embedment that is co-cured with the product makes the product demoulding have a stable demoulding point.

7. In the present invention, the bag-making efficiency can be improved by connecting the air nozzle and the main body mold into one body.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a schematic diagram of the overall structure of the main body mold mainly embodied in the present invention;

Fig. 2 is a schematic diagram of the bottom structure of the main body mold mainly embodied by the present invention;

Fig. 3 is a schematic diagram of the periphery of the frame structure mainly embodied in the present invention;

Fig. 4 is a schematic diagram of the overall structure of the demoulding assembly mainly embodied in the present invention;

Fig. 5 is a schematic diagram of the overall structure of the demoulding embedded parts mainly embodied in the present invention;

Fig. 6 is a schematic diagram of the installation structure of the silicon rubber ring mainly embodying the present invention.

As shown in the figure:

Main body mold 1 Window mandrel 4

Support point 11 Silicone rubber ring 5

Lifting rod 12 Demolding embedded parts 6

Transfer support plate 13 demoulding assembly 7

Target hole 14 Support plate 71

Ventilation hole 15 screw 72

Bar 2 Nut 73

Gas nozzle 3

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a mold for forming a large fairing provided according to the present invention includes a main body mold 1, a surrounding bar 2, an air nozzle 3, Window mandrel 4, silicone rubber ring 5, demoulding embedded part 6 and demoulding component 7. The outer bottom of the main mold 1 is provided with a plurality of support points 11 , the outer bottom of the main mold 1 is also provided with a transfer support plate 13 , and the outer peripheral side of the main mold 1 is provided with a lifting rod 12 . The surrounding bar 2 is fixed on the inner wall of the main mold 1 along the outer contour of the product, the window core mold 4 is fastened on the inner wall of the main mold 1, the silicone rubber ring 5 is set on the window core mold 4, and the air nozzle 3 is placed on the inner wall of the main mold 1. There are many evenly distributed around the side. The demoulding embedded part 6 is installed on the demoulding side of the main mold 1, and the demoulding embedded part 6 is solidified together with the product. The demoulding component 7 and the demoulding embedded part 6 are detachably connected, and the demoulding component 7 makes the product along the course demoulding.

Specifically, the main body mold 1 includes a cylinder section, a von Karman section and a ball end section arranged in sequence, the main body mold 1 includes a profile panel and a frame structure, the inner surface of the profile panel forms the inner wall of the main body mold 1, and the frame structure is connected to the profile panel The outer surface. The frame structure is formed by cooperation of transverse ribs, vertical ribs, oblique ribs and reinforcing ribs. And the support point 11, the transfer support plate 13 and the hoisting rod 12 are all arranged on the frame structure, and the ribs of the frame structure at the positions of the support point 11, the transfer support plate 13 and the hoisting rod 12 are denser in density and thicker in thickness. thick.

The main body mold 1 is an integral welded structure, the profile panel is a steel plate, the thickness of the profile panel is 15mm, and the thickness of the rib plate is 10mm. Ventilation holes 15 are opened on the rib plate of the frame structure, and target holes 14 are arranged around the main body mold 1 . Due to the thinner and uniform thickness of the molded panel, the heat capacity of the mold is small and the heating rate is fast. The ventilation holes 15 on the rib plate can not only reduce the weight, but also allow the high-temperature airflow in the autoclave to pass through the ventilation holes 15 to heat the mold quickly and evenly, so that the overall temperature field of the mold can be evenly distributed, and the temperature distribution of the product can be avoided. Uneven thermal stress.

Further, the support points 11 are arranged symmetrically with the center of gravity of the main body mold 1 on the main body mold 1, and at least three support points 11 are arranged at the bottom of the main body mold 1, and the lifting rod 12 is arranged on the main body mold 1 with the center of gravity of the main body mold 1 Set symmetrically.

A feasible implementation mode of the present application is: three supporting points 11 are welded on the bottom of the main mold 1, and four lifting rods 12 are welded on the side of the main mold 1. The transfer of the mold can be carried out by lifting the lifting rods 12, and can also be carried by a forklift. The support plate 13 is transferred, or the tank is placed on the bottom of the transfer support plate 13 for transfer. The main body mold 1 is evenly distributed with target holes 14 along the product contour, which are used for laser projection to place targets in the later stage.

The three support points 11 arranged at the bottom of the mold in the main figure can keep the stress point of the mold consistent regardless of the site, so as to ensure that the profile of the main mold 1 is always consistent in different sites. The support point 11 of the main mold 1 and the lifting rod are symmetrically arranged relative to the center of gravity of the main mold 1 to ensure that the main mold 1 remains balanced during the transfer and hoisting process, and can avoid safety accidents due to the tilt of the main mold 1 during the hoisting process.

The surrounding strip 2 is fixed on the main mold 1 along the outer contour of the product, and the surrounding strip 2 is provided with a glue overflow groove. The surrounding bar 2 forms a space for installing the demoulding embedded part 6 on the air release side of the main mold 1. The side of the demoulding embedded part 6 close to the product is provided with a transition chamfer, which can avoid bridging of the product layer and ensure product compaction , The side of the demoulding embedded part 6 facing away from the product is provided with a threaded hole for detachably connecting the demoulding component 7 . Two demoulding embedded parts 6 are arranged symmetrically with the central axis of the main mold 1 on the side of the air release of the main mold 1 . The material of the window mandrel 4 includes aluminum alloy. The demoulding course is the axial direction of the main mold 1, and the product can be demoulded along the course, avoiding the deformation of the product due to the demoulding in the vertical direction.

In this application, preferably, the material of the main mold 1, the surrounding bar 2, the air nozzle 3 and the demoulding embedded part 6 are all Q235, and the material of the window mandrel 4 is aluminum alloy 2A12. Since the aluminum alloy has a lower density and a larger coefficient of linear expansion, it is not only beneficial to separate the window mandrel 4 from the main body mold 1 along with the product, but also to separate the window mandrel 4 from the product during the demoulding stage. The gas nozzle 3 is connected with the main body mold 1 as a whole, which can improve the bag-making efficiency.

The demoulding assembly 7 includes a screw rod 72 , a support plate 71 and a nut 73 , the screw rod 72 is threaded through the support plate 71 , and the nut 73 is threadedly mounted on one end of the screw rod 72 .

According to a kind of processing method that is used for large fairing molding that the present invention provides, processing method comprises the following steps:

S1. Fix the surrounding bar 2 on the inner wall of the main mold 1 along the outer contour of the product, and form a space for installing the demoulding embedded part 6 on the air release side of the main mold 1 .

S2. Put the aramid paper honeycomb on the inner surface of the main mold 1 to solidify and shape it. After the shaped paper honeycomb is removed from the mold, the shape is cut out by machining.

S3. Install the demoulding embedded parts 6, install the air nozzles 3 evenly around the main mold 1, fix the window mandrel 4 on the main mold 1, and put the silicone rubber ring 5 on the window mandrel 4. The window mandrel 4 is positioned by pins and fastened to the designated position of the main body mold 1 with screws, and the designated position is the window position of the product. The silicone rubber ring 5 provides lateral pressure on the position of the product window during the curing process of the product.

S4. Lay layers on the main mold 1 by referring to laser projection and laying angled lines. First, lay the outer skin. After laying, place the cured and shaped aramid paper honeycomb, and finally lay the inner skin. Specifically, after all the parts are installed, the layering operation is carried out on the main mold 1 by referring to the laser projection and the angled scribe line. In the process of paving the inner Mongolia, the whole demoulding embedded part 6 is paved and wrapped in the position of the product blank.

S5, making bags on the mold and curing them. Specifically, after the layup is completed, the bag is made on the mold. The air felt is required to cover the 3 holes of the gas nozzle, and the sealing strip is attached to the outside of the 3 holes of the gas nozzle, and it is put into an autoclave to be pressurized and solidified.

S6. After the curing is completed, the fixing parts are removed, the demoulding component 7 is connected with the demoulding embedded part 6, and the demoulding embedded part 6 is pulled to carry out heading demoulding. After curing, remove all the pins, screws and silicone rubber, connect the demoulding component 7 with the demoulding embedded part 6, manually screw the nut 73 in the demoulding component 7 so that the screw rod 72 is connected to the demoulding embedded part 6 The threaded holes are connected, and then the demoulding embedded part 6 is pulled to move in the direction. The window mandrel 4 is demoulded along the course with the product. After the product is separated from the main mold 1, the window mandrel 4 is separated from the product.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

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.

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