阅读说明：本技术 卫星用复杂碳纤维加强筋整体成型模具设计方法及模具 (Design method and mold of integral forming mold of complex carbon fiber reinforcing rib for satellite ) 是由 吴文平 施静 董斌 史文锋 梁燕民 潘韵 吴鑫锐 韩雯婷 翟东坤 孙翀梁 于 2019-10-11 设计创作，主要内容包括：本发明提供了一种卫星用复杂碳纤维加强筋整体成型模具设计方法,包括如下步骤：外侧筋格限位步,采用外侧刚性围条限位形成外围筋格；中心筋格定位步骤,将刚性芯模设置在每个宫格筋内,从而进行定位和限位；软模设置步骤,在筋格中设置膨胀软模,以保证每根加强筋的左右两侧中,一侧为刚性模具,另一侧为膨胀软模；其中,所述宫格筋内是指加强筋中封闭部分合围形成的宫格区域内部；所述刚性模具包括外侧刚性围条和刚性芯模。(The invention provides a design method of an integral forming die for a complex carbon fiber reinforcing rib for a satellite, which comprises the following steps: limiting the outer rib grids by adopting outer rigid surrounding strips to form peripheral rib grids; a central rib grid positioning step, namely arranging a rigid core mold in each grid rib so as to perform positioning and limiting; a soft mold setting step, namely setting an expansion soft mold in the rib grids to ensure that one side of the left side and the right side of each reinforcing rib is a rigid mold, and the other side of the reinforcing rib is the expansion soft mold; the interior of the grid rib is the interior of a grid area formed by enclosing closed parts in the reinforcing ribs; the rigid mould comprises an outer rigid surrounding strip and a rigid core mould.)

1. A design method of an integral forming die for a complex carbon fiber reinforcing rib for a satellite is characterized by comprising the following steps:

limiting the outer rib grids: the outer rigid surrounding strips are used for limiting to form a peripheral rib grid;

positioning the central rib grids: arranging a rigid core mould in each grid rib so as to perform positioning and limiting;

soft mold setting: arranging an expansion soft die in the rib grids to ensure that one side of the left side and the right side of each reinforcing rib is a rigid die, and the other side of each reinforcing rib is the expansion soft die;

the interior of the grid rib is the interior of a grid area formed by enclosing closed parts in the reinforcing ribs; the rigid mould comprises an outer rigid surrounding strip and a rigid core mould.

2. The method for designing the integral molding die for the complex carbon fiber reinforcing bar for the satellite according to claim 1, wherein the rigid die comprises a steel die; the reinforcing ribs comprise carbon fiber reinforcing ribs.

3. The method for designing the integral molding die for the complex carbon fiber reinforcing bar for the satellite according to claim 1, wherein the thickness of the soft expansion die is in a range of 15mm to 20 mm.

4. The method for designing the integral forming mold for the complex carbon fiber reinforcing bar for the satellite according to claim 1, wherein in the step of the method for designing the integral forming mold for the complex carbon fiber reinforcing bar for the satellite, after the step of soft mold setting is completed, other steps are performed.

5. The design method of the integral forming die for the satellite complex carbon fiber reinforcing ribs is characterized in that the soft expansion die is of a plate strip structure, the plate strip structure means that the width of the soft expansion die is consistent with the height of the reinforcing ribs, and the length of the soft expansion die ranges from 1000mm to 2000 mm.

6. The method for designing the integral forming die for the complex carbon fiber reinforcing rib for the satellite according to claim 1, wherein the reinforcing rib is a reinforcing rib in a grid shape; the integral forming die is provided with an R-angle expansion soft die with a set structure at the position corresponding to the R-angle of the reinforcing rib in the grid shape; the overall dimension of the R-angle expansion soft die corresponds to the R-angle structure of the reinforcing rib in the grid shape.

7. The method for designing the integral molding die for the complex carbon fiber reinforcing ribs for the satellites as recited in claim 6, wherein the R-angle expansion soft die is formed by casting with a die which is additionally designed.

8. The integral forming mold for the complex carbon fiber reinforcing rib for the satellite is characterized by being manufactured by the design method for the integral forming mold for the complex carbon fiber reinforcing rib for the satellite of any one of claims 1 to 7, and comprising a bottom mold, a rigid mold, a plate belt expansion soft mold and an R angle expansion soft mold;

the rigid mould, the plate strip expansion soft mould and the R angle expansion soft mould are all arranged on the bottom mould;

the rigid mould comprises an outer rigid surrounding strip and a rigid core mould; the rigid core mold comprises a central rigid core mold and a peripheral rigid core mold.

9. The integrated forming mold for the complex carbon fiber reinforcing rib for the satellite according to claim 8, wherein the reinforcing rib is a nine-grid-shaped reinforcing rib, and the closed nine-grid of the nine-grid-shaped reinforcing rib is sequentially marked as a first grid body, a second grid body … and a ninth grid body from left to right and from top to bottom by referring to a top view of the reinforcing rib;

1 central rigid core mould is arranged in the fifth grid body; the second grid, the sixth grid and the eighth grid are respectively provided with 1 peripheral rigid core mold; the four grids of the first grid, the third grid, the seventh grid and the eighth grid are respectively provided with 2 peripheral rigid core moulds in central symmetry; the fourth lattice is provided with 3 peripheral rigid mandrels.

10. The integrated forming mold for the complex carbon fiber reinforcing rib for the satellite according to claim 8, wherein the peripheral rigid core molds arranged in the second lattice body and the eighth lattice body are rectangular core molds; the central rigid core mould arranged in the fifth lattice body is a rectangular core mould; 2 peripheral rigid core moulds which are respectively arranged in the fourth grid body, the third grid body, the seventh grid body and the eighth grid body in a central symmetry mode are all triangular core moulds; the 3 peripheral rigid mandrels arranged in the fourth lattice consist of 1 trapezoidal mandrel and 2 rectangular mandrels.

Technical Field

The invention relates to the technical field of large-size satellite antennas, in particular to a design method and a mold for an integral forming mold of a complex carbon fiber reinforcing rib for a satellite, and particularly relates to a design method and a mold for an integral forming mold of a complex carbon fiber nine-grid reinforcing rib for a satellite.

Background

The antenna component is large in size due to the use wave band requirement of part of the antenna structural component for the satellite, in order to ensure that the antenna component has enough rigidity and higher precision requirement, a large-size reinforcing rib needs to be added to improve the integral rigidity, and meanwhile, under the weight-reducing pressure, most of the reinforcing ribs are carbon fiber components with high strength, large rigidity and low density.

At present, the carbon fiber structure of small-size strengthening rib adopts inside and outside steel mould compression molding, like the whole parabolic type satellite antenna who installs strengthening rib structure additional that patent document CN2904327Y disclosed, including the one end and antenna tray 2 of many strengthening ribs 3, paraboloid 1 zonulae occludens together, the rest of strengthening rib 3 is in zonulae occludens together with paraboloid 1, strengthening rib 3 uses antenna tray 2 as the center, becomes radial distribution on paraboloid 1.

However, for large-size complex reinforcing ribs, the four directions between steel dies are limited more, the die assembly is difficult, and the integral molding is difficult to realize. The adoption of the segmented molding needs to increase the link screw and the link piece, so that the integral rigidity of the reinforcing rib is reduced, the passive weight is increased, and the use requirement cannot be met.

Therefore, the design method of the nine-grid rib mold for integral molding is extremely urgent.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a design method and a mold for an integral forming mold of a complex carbon fiber reinforcing rib for a satellite.

The invention provides a design method of an integral forming die for a complex carbon fiber reinforcing rib for a satellite, which comprises the following steps:

limiting the outer rib grids: the outer rigid surrounding strips are used for limiting to form a peripheral rib grid;

positioning the central rib grids: arranging a rigid core mould in each grid rib so as to perform positioning and limiting;

soft mold setting: arranging an expansion soft die in the rib grids to ensure that one side of the left side and the right side of each reinforcing rib is a rigid die, and the other side of each reinforcing rib is the expansion soft die;

the interior of the grid rib is the interior of a grid area formed by enclosing closed parts in the reinforcing ribs; the rigid mould comprises an outer rigid surrounding strip and a rigid core mould.

Preferably, the rigid mould comprises a steel mould; the reinforcing ribs comprise carbon fiber reinforcing ribs.

Preferably, the thickness of the expanded soft mold ranges from 15mm to 20 mm.

Preferably, in the step of the design method of the integral forming die for the satellite complex carbon fiber reinforcing ribs, after the step of soft die setting is completed, other steps are performed.

Preferably, the soft expansion die is of a plate strip structure, the plate strip structure means that the width of the soft expansion die is consistent with the height of the reinforcing ribs, and the length range of the soft expansion die is 1000mm-2000 mm.

Preferably, the reinforcing ribs are reinforcing ribs in a nine-grid pattern; the integral forming die is provided with an R-angle expansion soft die with a set structure at the position corresponding to the R-angle of the reinforcing rib in the grid shape; the overall dimension of the R-angle expansion soft die corresponds to the R-angle structure of the reinforcing rib in the grid shape.

Preferably, the R-angle expansion soft die is formed by casting with a die designed additionally.

According to the integral forming die for the complex carbon fiber reinforcing ribs for the satellites, which is provided by the invention, the integral forming die is manufactured by the design method for the integral forming die for the complex carbon fiber reinforcing ribs for the satellites, and comprises a bottom die, a rigid die, a plate belt expansion soft die and an R angle expansion soft die;

the rigid mould, the plate strip expansion soft mould and the R angle expansion soft mould are all arranged on the bottom mould;

the rigid mould comprises an outer rigid surrounding strip and a rigid core mould; the rigid core mold comprises a central rigid core mold and a peripheral rigid core mold.

Preferably, the reinforcing ribs are reinforcing ribs in a nine-grid format, and the closed nine-grid of the reinforcing ribs in the nine-grid format is sequentially marked as a first grid body and a second grid body … as a ninth grid body from left to right and from top to bottom by referring to the top view of the reinforcing ribs;

1 central rigid core mould is arranged in the fifth grid body; the second grid, the sixth grid and the eighth grid are respectively provided with 1 peripheral rigid core mold; the four grids of the first grid, the third grid, the seventh grid and the eighth grid are respectively provided with 2 peripheral rigid core moulds in central symmetry; the fourth lattice is provided with 3 peripheral rigid mandrels.

Preferably, the peripheral rigid core dies arranged in the second grid and the eighth grid are rectangular core dies; the central rigid core mould arranged in the fifth lattice body is a rectangular core mould; 2 peripheral rigid core moulds which are respectively arranged in the fourth grid body, the third grid body, the seventh grid body and the eighth grid body in a central symmetry mode are all triangular core moulds; the 3 peripheral rigid mandrels arranged in the fourth lattice consist of 1 trapezoidal mandrel and 2 rectangular mandrels.

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

1. the feasibility of manufacturing large-size Jiugong tendon is improved

By adopting the mold design method, the direct heating and curing of the oven or the autoclave can be realized, a press is not needed for curing, the dependence on large-tonnage equipment is reduced, and the mold design method has feasibility of forming especially for reinforcing rib structures with larger sizes, such as 2-3 or 5m and the like.

2. Can realize the integral forming of the complicated nine-grid rib

By adopting the design method, the same design concept can be adopted for complicated nine-grid ribs or ribs with larger size, so that after the carbon fiber belts or carbon fiber cloth of all the ribs are paved, the whole body is cured at high temperature, the whole back rib part is formed in one step, the connecting links among all the ribs are reduced, the connecting weight is reduced, and the design method has important reference value for products with strict weight requirements.

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 top view structure diagram of a preferred embodiment of the mold and the method for designing the integral forming mold of the complex carbon fiber reinforcing rib for the satellite provided by the invention.

Fig. 2 is a schematic perspective view of a preferred embodiment of a method for designing an integral forming mold for a complex carbon fiber reinforcing rib for a satellite and the mold provided by the invention.

The figures show that:

a bottom die 1, a central steel die (central rigid core die) 2, other steel core dies (peripheral rigid core dies) 3-18, a circle of side surrounding strips (outer rigid surrounding strips) 19-30, and expansion soft dies (including plate strip expansion soft dies and R angle expansion soft dies) 31-61.

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.

The invention provides a design method of an integral forming die for a complex carbon fiber reinforcing rib for a satellite, which comprises the following steps:

limiting the outer rib grids: the outer rigid surrounding strips are used for limiting to form a peripheral rib grid;

positioning the central rib grids: arranging a rigid core mould in each grid rib so as to perform positioning and limiting;

soft mold setting: arranging an expansion soft die in the rib grids to ensure that one side of the left side and the right side of each reinforcing rib is a rigid die, and the other side of each reinforcing rib is the expansion soft die;

the interior of the grid rib is the interior of a grid area formed by enclosing closed parts in the reinforcing ribs; the rigid mould comprises an outer rigid surrounding strip and a rigid core mould.

The rigid mold comprises a steel mold; the reinforcing ribs comprise carbon fiber reinforcing ribs.

The thickness range of the expansion soft die is 15mm-20 mm.

In the step of the design method of the integral forming die for the complex carbon fiber reinforcing ribs for the satellite, after the soft die setting step is completed, other steps are carried out.

The expansion soft die is of a plate strip structure, the plate strip structure means that the width of the expansion soft die is consistent with the height of the reinforcing ribs, and the length range of the expansion soft die is 1000mm-2000 mm.

The reinforcing ribs are nine-grid reinforcing ribs; the integral forming die is provided with an R-angle expansion soft die with a set structure at the position corresponding to the R-angle of the reinforcing rib in the grid shape; the overall dimension of the R-angle expansion soft die corresponds to the R-angle structure of the reinforcing rib in the grid shape.

The R-angle expansion soft die is formed by adopting a die with another design through pouring.

According to the integral forming die for the complex carbon fiber reinforcing ribs for the satellites, which is provided by the invention, the integral forming die is manufactured by the design method for the integral forming die for the complex carbon fiber reinforcing ribs for the satellites, and comprises a bottom die, a rigid die, a plate belt expansion soft die and an R angle expansion soft die;

the rigid mould, the plate strip expansion soft mould and the R angle expansion soft mould are all arranged on the bottom mould;

the rigid mould comprises an outer rigid surrounding strip and a rigid core mould; the rigid core mold comprises a central rigid core mold and a peripheral rigid core mold.

The reinforcing ribs are reinforcing ribs in a nine-grid form, and the closed nine-grid of the reinforcing ribs in the nine-grid form is sequentially marked as a first grid body and a second grid body … as a ninth grid body from left to right and from top to bottom by referring to the top view of the reinforcing ribs;

1 central rigid core mould is arranged in the fifth grid body; the second grid, the sixth grid and the eighth grid are respectively provided with 1 peripheral rigid core mold; the four grids of the first grid, the third grid, the seventh grid and the eighth grid are respectively provided with 2 peripheral rigid core moulds in central symmetry; the fourth lattice is provided with 3 peripheral rigid mandrels.

The peripheral rigid core dies arranged in the second grid body and the eighth grid body are rectangular core dies; the central rigid core mould arranged in the fifth lattice body is a rectangular core mould; 2 peripheral rigid core moulds which are respectively arranged in the fourth grid body, the third grid body, the seventh grid body and the eighth grid body in a central symmetry mode are all triangular core moulds; the 3 peripheral rigid mandrels arranged in the fourth lattice consist of 1 trapezoidal mandrel and 2 rectangular mandrels.

Further, the preferred embodiment of the invention discloses a design method of a complex carbon fiber nine-grid-rib integral forming die suitable for satellites, and the overall die design idea is to adopt a steel die as a limiting die and an expansion soft die as a side pressurizing die; the invention determines that the expansion soft die structure is a plate strip-shaped structure, the thickness is 15mm-20mm, and a design method of one side soft die of one side steel die and increasing the position limitation of the steel die behind the soft die is defined; aiming at the large-size complex carbon fiber nine-grid-shaped rib of the satellite, the invention develops a mold design method which is simple in mold structure, feasible in high-temperature curing and pressurizing and low in equipment dependence.

According to the design method of the complex carbon fiber nine-grid rib integral forming die for the satellite, which is provided by the preferred embodiment of the invention, the design method comprises the following steps: the outer side of the rib lattice at the outermost periphery of the nine-grid lattice is limited by a steel surrounding strip, a steel core mould is adopted in each grid rib for positioning and limiting, and the left side surface and the right side surface of each carbon fiber rib in the nine-grid rib take one side as a rigid mould and one side as an expansion soft mould to finally form an integral mould.

According to the die structure, the thickness of the expansion soft die is only 15-20mm, and a steel die is designed for limiting after the expansion soft die.

The expansion soft mold adopts a plate belt structure with the thickness of 15-20mm, the width of rib height and the length of 1000-2000mm, the R angle position adopts a single expansion soft mold, and the external dimension of the expansion soft mold is consistent with the structure of the R angle position. And pouring the structure at the R-shaped corner of the rib by adopting an additionally designed mould.

The invention aims to provide a design method suitable for a satellite complex carbon fiber nine-grid-rib integral forming die, which breaks through the technology that the pressure measurement of a combined forming die cannot be uniformly provided and the connection design technology of the complex reinforcing rib combined forming die by optimally combining two die materials of a steel die and a soft die, and realizes the design technology of the complex reinforcing rib integral forming die.

The purpose of the preferred embodiment of the invention is realized by the following technical scheme:

the invention relates to a design method of an integral forming die for satellite complex carbon fiber nine-grid-rib, which adopts a mode of combining steel die expansion dies, optimizes the combination position of the two, and carries out positioning integral positioning through a bottom die to ensure the precision position of the grid rib.

The outer side of the Sudoku mould is limited by a steel surrounding strip, and the center of the Sudoku mould is limited by a steel core mould.

The nine-grid die mainly adopts the design principle that one side of each reinforcing rib is a rigid die and the other side of each reinforcing rib is an expansion soft die.

The expanded soft mold in the Sudoku mold is of a plate strip structure, the thickness of the expanded soft mold is 15-20mm, and a steel mold is still designed on the outer side of the expanded soft mold for positioning the soft mold.

And all the side steel surrounding strips and the steel moulds of the Sudoku mould are positioned with the bottom plate in a pin and screw mode.

Further, the specific embodiments of the present invention are as follows:

taking a typical carbon fiber nine-grid-rib as an example, see fig. 1 and 2, the nine-grid-rib mold comprises a bottom mold 1, a central steel mold (central rigid core mold) 2, other steel core molds (peripheral rigid core molds) 3-18, a circle of side surrounding strips (outer rigid surrounding strips) 19-30, and expansion soft molds (including plate strip expansion soft molds and R-angle expansion soft molds) 31-61.

1) Mold material selection

The bottom die adopts a 45# steel die, a central steel die and other steel dies adopt 45# steel dies, if the product amount is large, the die steel with higher strength such as P20 can be considered, and the expansion soft die is made of a material with high expansion ratio at high temperature.

2) Mold design

In the process of designing the die, the steel die is determined to be the outermost side, and the design idea of the soft die on the steel die side on one side of each rib is taken to design from outside to inside step by step. And the central steel die is determined, and the integral position degree of the rib is ensured. The combination form of the steel or the soft mold around the rib grid is considered in each rib grid. The expansion soft die adopts a plate strip structure, the surface of a product is taken as the inner side, and a steel die is still designed on the outer side of the expansion soft die for limiting.

The left-right symmetry and the position symmetry of the soft mold are considered as much as possible during mold design.

All the limiting molds are fixedly connected with the bottom mold through pins and screws.

3) Processing of expandable soft die

According to the structural form of the rib, the forming die of the expansion soft die is designed independently, and the R angle die design at the rib intersection is considered, so that the uniform R angle curing pressure of the rib is ensured.

4) Die machining

And processing the die according to the three-dimensional graph and the two-dimensional graph.

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, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. 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.