阅读说明：本技术 复合材料波形膜盘及其热压成型模具和热压成型方法 (Composite material corrugated film disc, hot-press forming die and hot-press forming method thereof ) 是由 毕凤阳 刘长喜 王晓宏 马海宇 石秋寒 孙家鑫 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种复合材料波形膜盘,包括膜盘本体,所述膜盘本体上设有中心通孔和与所述中心通孔同轴设置的波形曲面环形区,所述波形曲面环形区的内侧设有内连接环、外侧设有外连接环,所述内连接环内环形均布设有内连接孔,外连接环内环形均布设有外连接孔；所述膜盘本体采用复合材料制成。本发明还公开了一种种复合材料波形膜盘热压成型模具和热压成型方法。本发明的复合材料波形膜盘及其热压成型模具和热压成型方法,采用复合材料制作波形膜盘,不仅能够满足波形膜盘的复杂受力需求,而且具有自重低、抗阻尼性好、传动平稳、寿命长和抗腐蚀性好的优点。(The invention discloses a composite material waveform membrane disc, which comprises a membrane disc body, wherein the membrane disc body is provided with a central through hole and a waveform curved surface annular area which is coaxial with the central through hole, the inner side of the waveform curved surface annular area is provided with an inner connecting ring, the outer side of the waveform curved surface annular area is provided with an outer connecting ring, inner connecting holes are uniformly distributed in the inner annular area of the inner connecting ring, and outer connecting holes are uniformly distributed in the outer annular area of the outer connecting ring; the membrane disc body is made of composite materials. The invention also discloses a hot-press forming die and a hot-press forming method for the composite material corrugated film disc. The composite material corrugated film disc, the hot-press forming die and the hot-press forming method thereof adopt the composite material to manufacture the corrugated film disc, not only can meet the complex stress requirement of the corrugated film disc, but also have the advantages of low self weight, good damping resistance, stable transmission, long service life and good corrosion resistance.)

1. A composite material wave-shaped membrane disc comprises a membrane disc body (1), and is characterized in that: the membrane disc comprises a membrane disc body (1), wherein a central through hole (2) and a wave-shaped curved surface annular area (3) which is coaxial with the central through hole (2) are arranged on the membrane disc body (1), an inner connecting ring (4) is arranged on the inner side of the wave-shaped curved surface annular area (3), an outer connecting ring (6) is arranged on the outer side of the wave-shaped curved surface annular area, inner connecting holes (5) are uniformly distributed in the inner ring of the inner connecting ring (4), and outer connecting holes (7) are uniformly distributed in the inner ring of the outer;

the membrane disc body (1) is made of composite materials.

2. The composite waveform membrane disk of claim 1 wherein: the curved surface of the arbitrary section passing through the axis of the membrane disc body and obtained on the wave-shaped curved surface annular area (3) is a wave-shaped section, and the contour lines on the two sides of the wave-shaped section are sine wave curves or arc lines which are parallel to each other.

3. The composite waveform membrane disk of claim 1 or 2, wherein: the membrane disc body (1) is made of fiber reinforced resin matrix composite materials.

4. The composite waveform membrane disk of claim 3 wherein: the membrane disc is characterized in that a plurality of layers of prepreg paving layers are arranged in the membrane disc body (1), two mutually perpendicular radial directions of the membrane disc body (1) are respectively 0 degree and 90 degrees, and all the prepreg paving layers at least comprise a 0-degree paving layer with a fiber direction of 0 degree, a 90-degree paving layer with a fiber direction of 90 degrees, a 45-degree paving layer with a fiber direction of 45 degrees and a-45-degree paving layer with a fiber direction of-45 degrees.

5. The composite waveform membrane disk of claim 4 wherein: the prepreg paving form in the film disc body (1) is as follows: [0 °/45 °/90 °/90 °/45 °/0 °/0 °/45 °/90 °/90 °/45 °/0 ° ]]_S。

6. A hot press molding die for hot press molding the composite material corrugated film disc as set forth in any one of claims 1 to 5, characterized in that: comprises an upper die (11) and a lower die (12);

a hot-press molding cavity (13) for hot-press molding the corrugated film disc is arranged between the upper die (11) and the lower die (12), the hot-press molding cavity (13) comprises a corrugated surface molding area (14) for hot-press molding the corrugated surface annular area (3), an inner connecting ring molding area (15) for molding the inner connecting ring (4) is arranged on the inner side of the corrugated surface molding area (14), and an outer connecting ring forming area (17) for molding the outer connecting ring (6) is arranged on the outer side of the corrugated surface molding area; an inner embedded assembly (16) used for forming the inner connecting hole (5) is arranged in the inner connecting ring forming area (15), and an outer embedded assembly (18) used for forming the outer connecting hole (7) is arranged in the outer connecting ring forming area (17).

7. The composite material corrugated film disc hot press molding die as set forth in claim 6, wherein: the upper die (11) and the lower die (12) are both made of 7075-T651 aluminum alloy; and a 3-degree demoulding inclination is arranged in the hot-press molding cavity (13).

8. The composite material corrugated film disc hot press molding die as set forth in claim 6, wherein: the inner embedded component (16) and the outer embedded component (18) adopt embedded components with the same structure, each embedded component comprises a pre-embedded head (19), a counter bore (20) is arranged on the upper surface of the lower die (12), a through hole (21) is formed in the hole bottom of the counter bore (20), each pre-embedded head (19) comprises a lower end (19a) positioned in the inner counter bore (20) and an upper end (19b) positioned above the lower end (19a), the outer diameter of the lower end (19a) is equal to the inner diameter of the counter bore (20), the thickness of the lower end is equal to the depth of the counter bore (20), the outer diameter of the upper end (19b) is equal to the inner diameter of the inner connecting hole (5) or the outer connecting hole (7) correspondingly, and the height of the upper end (19b) is greater than or equal to the height of the inner connecting ring forming area (15) or the outer connecting ring forming area (17) correspondingly, go up on the lower surface of mould with pre-buried head (19) one-to-one is equipped with and steps down hole (22), be equipped with in perforation (21) with pre-buried head (19) threaded connection makes pre-buried head (19) axial fixity correspond pre-buried connecting screw (23) in counter bore (20).

9. The composite material corrugated film disc hot press molding die as set forth in claim 6, wherein: the device also comprises a demoulding component and a guide component; the demolding assembly comprises threaded through holes (24) arranged at four diagonal positions of the upper mold (11) and demolding screws (25) in threaded fit with the threaded through holes (24); the guide assembly comprises a guide column (26) arranged on the upper surface of the lower die (12), and a guide hole (27) is correspondingly formed in the upper die (11) and the guide column (26).

10. A hot press molding method using the composite material corrugated film disc hot press molding die as set forth in any one of claims 6 to 9, characterized in that: the method comprises the following steps:

1) cutting the prepreg into needed figures with different angles to obtain a prepreg paving layer, and drawing the fiber direction of the prepreg paving layer;

2) laying a film disc, heating the prepreg paving layer obtained by cutting, laying loose prepreg paving layers according to a design paving form when the prepreg paving layers are softened to facilitate laying, and finally laying into a film disc paving layer compact body with a regular shape;

3) closing the die and curing, closing an upper die (11) and a lower die (12), placing the film disc laying compact body in the hot-press molding cavity (13), and then heating and curing the film disc laying compact body to obtain the composite material corrugated film disc;

4) and (3) demolding, namely demolding the upper mold (11) and the lower mold (12), and taking out the obtained composite material corrugated film disc from the hot-press molding cavity (13).

Technical Field

The invention relates to a corrugated film disc, in particular to a composite material corrugated film disc, a hot-press forming die and a hot-press forming method thereof.

Background

The diaphragm coupling is a mechanical device which is formed by connecting several groups of diaphragms with two half couplings in a staggered mode through bolts and transmits torque by using extremely thin metal discs. The membrane disc coupling is a high-performance flexible coupling of metal elastic elements, does not need lubrication, has a compact structure, high strength, long service life, no rotating clearance, is not influenced by temperature and oil dirt, has the characteristics of acid resistance, alkali resistance and corrosion resistance, and is suitable for shafting transmission in high-temperature, high-speed and corrosive medium working condition environments. The waveform membrane disc is a key element of the elastic coupling, the membrane disc coupling compensates the relative displacement of the two shafts connected by the elastic deformation of the membrane disc, so that larger stress can be generated in the membrane disc coupling, the membrane disc bears composite forces of stretching, extruding, shearing and the like in the running process, is in a complex stress state, transmits torque and motion, and absorbs vibration and compensates deviation.

Fiber Reinforced Resin Matrix Composites (hereinafter referred to as Composites) have the characteristics of high specific strength and specific modulus, fatigue resistance, corrosion resistance, strong designability and the like, and the excellent characteristics make the composite become one of the most important aerospace structural materials after aluminum alloys, titanium alloys and steels. The composite material has the advantages of low self weight (for example, the weight can be reduced by about 70 percent relative to metal), good damping resistance (for example, the torsional curvature is only about half of that of steel), stable transmission, long service life, good corrosion resistance, non-conductivity and the like, and obtains more and more extensive attention and application.

Disclosure of Invention

In view of the above, the present invention provides a composite material corrugated membrane disc, a hot-press forming mold and a hot-press forming method thereof, wherein the corrugated membrane disc made of the composite material not only can meet the complex stress requirement of the corrugated membrane disc, but also has the advantages of low self weight, good damping resistance, stable transmission, long service life and good corrosion resistance.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention firstly provides a composite material waveform membrane disc, which comprises a membrane disc body, wherein the membrane disc body is provided with a central through hole and a waveform curved surface annular area which is coaxial with the central through hole, the inner side of the waveform curved surface annular area is provided with an inner connecting ring, the outer side of the waveform curved surface annular area is provided with an outer connecting ring, inner annular connecting holes are uniformly distributed in the inner connecting ring, and outer annular connecting holes are uniformly distributed in the outer connecting ring;

the membrane disc body is made of composite materials.

Furthermore, the curved surface obtained by cutting the arbitrary section of the axis of the membrane disc body on the annular area of the wavy curved surface is a wavy section, and the contour lines on two sides of the wavy section are sine wave curves or arc lines which are parallel to each other.

Further, the membrane disc body is made of fiber reinforced resin matrix composite materials.

Further, this internal multilayer prepreg shop layer that is equipped with of membrane dish, and make two mutually perpendicular radial directions of membrane dish body be 0 and 90 respectively, then in all prepreg shop layers, including at least that the fibre direction is 0 shop layer, 90 shop layers, 45 shop layers and 45 shop layers that the fibre direction is 45 that the fibre direction is 0 shop layers, 90 shop layers, fibre direction is 45 shop layers and 45 shop layers that the fibre direction is-45.

Further, the prepreg layup form in the membrane disc body is: [0 °/45 °/90 °/90 °/45 °/0 °/0 °/45 °/90 °/90 °/45 °/0 ° ]]_S。

The invention also provides a hot-press forming die for hot-press forming the composite material corrugated film disc, which comprises an upper die and a lower die;

a hot-press molding cavity for hot-press molding the corrugated film disc is arranged between the upper die and the lower die, the hot-press molding cavity comprises a corrugated surface molding area for hot-press molding the corrugated surface annular area, an inner connecting ring molding area for molding the inner connecting ring is arranged on the inner side of the corrugated surface molding area, and an outer connecting ring forming area for molding the outer connecting ring is arranged on the outer side of the corrugated surface molding area; the inner connecting ring forming area is internally provided with an inner embedded assembly for forming the inner connecting hole, and the outer connecting ring forming area is internally provided with an outer embedded assembly for forming the outer connecting hole.

Further, the upper die and the lower die are both made of 7075-T651 aluminum alloy; and a 3-degree demoulding inclination is arranged in the hot-press molding cavity.

Further, the inner embedded component and the outer embedded component adopt embedded components with the same structure, the embedded components comprise embedded heads, the upper surface of the lower die is provided with a counter bore, the bottom of the counter bore is provided with a through hole, the pre-buried head comprises a lower end head positioned in the counter bore and an upper end head positioned above the lower end head, the outer diameter of the lower end head is equal to the inner diameter of the counter bore, the thickness of the lower end head is equal to the depth of the counter bore, the outer diameter of the upper end head is equal to the inner diameter of the corresponding inner connecting hole or outer connecting hole, and the height of the upper end is more than or equal to the height of the corresponding inner connecting ring forming area or outer connecting ring forming area, the lower surface of the upper die is provided with a stepping hole corresponding to the embedded head one by one, and the through hole is internally provided with an embedded connecting screw which is in threaded connection with the embedded head and enables the embedded head to be axially fixed in the corresponding counter bore.

Further, the device also comprises a demoulding component and a guiding component; the demolding assembly comprises threaded through holes arranged at four diagonal positions of the upper mold and demolding screws in threaded fit with the threaded through holes; the guide assembly comprises a guide post arranged on the upper surface of the lower die, and a guide hole is correspondingly formed in the upper die and corresponds to the guide post.

The invention also provides a hot-press molding method of the composite material corrugated film disc hot-press molding die, which comprises the following steps:

1) cutting the prepreg into needed figures with different angles to obtain a prepreg paving layer, and drawing the fiber direction of the prepreg paving layer;

2) laying a film disc, heating the prepreg paving layer obtained by cutting, laying loose prepreg paving layers according to a design paving form when the prepreg paving layers are softened to facilitate laying, and finally laying into a film disc paving layer compact body with a regular shape;

3) closing the die and curing, closing the upper die and the lower die, placing the film disc laying compact body in the hot-press molding cavity, and then heating and curing the film disc laying compact body to obtain the composite material corrugated film disc;

4) and demolding, namely demolding the upper mold and the lower mold, and taking the obtained composite material corrugated film disc out of the hot-press molding cavity.

The invention has the beneficial effects that:

the composite material corrugated film disc is made of the composite material, not only can meet the complex stress requirement of the corrugated film disc, but also has the advantages of low self weight, good damping resistance, stable transmission, long service life and good corrosion resistance.

Drawings

In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:

FIG. 1 is a schematic structural view of an embodiment of a composite material corrugated membrane disk of the present invention;

FIG. 2a is a model diagram of a circular arc-shaped annular region of a wave-shaped curved surface;

FIG. 2b is a model diagram of a sine wave curved annular region;

FIG. 3a is a finite element analysis model of a circular arc curved surface membrane disc;

FIG. 3b is a finite element analysis model of a sine wave curved membrane disc;

FIG. 4a is a schematic view of the application of a load to a circular arc-shaped curved membrane disc;

FIG. 4b is a schematic view of the application of a load to a sine wave curved membrane disc;

FIG. 5a is a stress distribution diagram of a circular arc curved surface membrane disk;

FIG. 5b is a stress distribution plot of a sine wave curved membrane disk;

FIG. 5c is a graph of the strain distribution of a circular arc-shaped curved membrane disk;

FIG. 5d is a graph of the strain distribution of a sine wave curved membrane disk;

FIG. 6a is the maximum torsion angle of a sine wave curved surface membrane disc at different oblique symmetrical layering angles;

FIG. 6b is the maximum axial displacement of the sine wave curved surface membrane disc at different oblique symmetrical layering angles;

FIG. 7 is the maximum stress in each ply of a sine wave curved surface membrane disk at different skew symmetrical ply angles under an axial displacement load;

FIG. 8a is [0 ]]_4sStress distribution of the composite sine-wave curved-surface membrane disc which is laid in an oblique-crossing symmetrical mode under the action of an axial displacement load D (D is 5 mm);

FIG. 8b is [90 ° ]]_4sStress distribution of the composite sine-wave curved-surface membrane disc which is laid in an oblique-crossing symmetrical mode under the action of an axial displacement load D (D is 5 mm);

FIG. 9 shows the maximum stress in each ply in a sine wave curved surface membrane disc at different skew symmetrical ply angles under the action of a bending moment M;

FIG. 10 shows the twist angle of the composite material sinusoidal curved film disk at different ply angle ratios under the same torque T;

FIG. 11 is a graph of axial stiffness of a composite sine wave curved film disk versus different ply angle ratios;

FIG. 12 is an angular compensation of a composite sine wave curved film disk at different ply angle ratios;

fig. 13 is the strain distribution of the composite sine-wave curved membrane disc under the action of a torque T of 50 kn.m;

FIG. 14 is a strain distribution of a composite sine-wave curved-surface membrane disc under the action of an axial displacement load D-5 mm;

fig. 15 is the strain distribution of the composite sine-wave curved-surface membrane disc under the action of a bending moment M of 0.1 kn.m;

FIG. 16 shows the strain distribution of the composite sine-wave curved-surface membrane disc under the actions of torque T, bending moment M and axial displacement load D;

FIG. 17 is a schematic view of the ply orientation;

FIG. 18 is a schematic structural view of an embodiment of a thermoforming mold for a composite material corrugated film tray;

FIG. 19 is a cross-sectional view A-A of FIG. 18;

FIG. 20 is detail B of FIG. 19;

FIG. 21 is a schematic structural view of an upper die;

fig. 22 is a schematic structural view of the lower die.

Description of reference numerals:

1-a membrane disc body; 2-a central through hole; 3-a wave-shaped curved surface annular area; 4-inner connecting ring; 5-internal connection hole; 6-outer connecting ring; 7-external connection hole;

11-upper mould; 12-lower die; 13-hot-press molding the cavity; 14-a wave-shaped curved surface forming area; 15-inner link ring forming zone; 16-inner embedded components; 17-an outer connecting ring forming region; 18-outer embedded components; 19-pre-countersunk; 19 a-lower end; 19 b-upper end; 20-counter bore; 21-punching; 22-a relief hole; 23-embedding a connecting screw; 24-a threaded through hole; 25-stripper screws; 26-a guide post; 27-guide hole.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

Fig. 1 is a schematic structural diagram of an embodiment of a composite material corrugated membrane disc according to the present invention. The composite material waveform membrane disc comprises a membrane disc body 1, wherein a central through hole 2 and a waveform curved surface annular area 3 which is coaxial with the central through hole 2 are arranged on the membrane disc body 1, an inner connecting ring 4 is arranged on the inner side of the waveform curved surface annular area 3, an outer connecting ring 6 is arranged on the outer side of the waveform curved surface annular area, inner connecting holes 5 are uniformly distributed in the inner ring of the inner connecting ring 4, and outer connecting holes 7 are uniformly distributed in the inner ring of the outer connecting ring 6; the membrane disc body 1 is made of composite materials. Specifically, the membrane disc body 1 of the present embodiment is made of a fiber reinforced resin matrix composite material.

Furthermore, the curved surface of the arbitrary section of the axis of the membrane passing disc body on the annular area 3 of the waveform curved surface is a waveform section, and the contour lines on two sides of the waveform section are sine wave curves or arc lines which are parallel to each other. Specifically, as shown in fig. 2a, the model is a diagram when the annular region of the wave-shaped curved surface is a circular arc surface; FIG. 2b is a model diagram of a sine wave curved annular region. Based on ABAQUS software, two finite element analysis models of the curved surface membrane disk are established. In the model, a cylindrical coordinate system is established by taking a rotating shaft of the curved surface membrane disc as a coordinate axis, and two reference points are established on the rotating shaft, wherein the reference points are KP (Kernel Permeability) respectively₁And KP₂. The nodes of the inner edge and the outer edge of the numerical model of the curved surface membrane disc are respectively in a set form with the reference point KP₁And KP₂Are coupled together. In the analysis process, the outer edge reference point KP of the curved surface membrane disc is used₁Fixed, at the edge reference point KP₂Torque T is applied and the numerical model is shown in fig. 3a and 3 b. Based on the model, the comparative analysis of the torque transfer capacity of the two curved-surface membrane discs is carried out, two analysis steps are established in the analysis process, the centrifugal force is applied in the first analysis step, and the torque T is applied in the second analysis step, as shown in figures 4a and 4 b. The stress and strain distribution pairs of the composite material corrugated membrane discs with the same lay-up arrangement but different corrugated forms are shown in fig. 5a-5d under the same rotating speed and the same torque T.

As can be seen from fig. 5a and 5 b: the integral stress distribution range of the arc curved surface membrane disc is 9.7-28.4MPa, the stress distribution range in the curved surface area is 15.9-28.4MPa, the integral stress distribution range of the sine wave curved surface membrane disc is 1.8-21.7MPa, and the stress distribution range in the curved surface area is 5-12.7 MPa; as can be seen from fig. 5c and 5 d: the strain distribution range of the whole circular arc curved surface membrane disc is 260-1339 mu epsilon, and the strain distribution range in the curved surface area is 529-889 mu epsilon; the whole strain distribution range of the sine wave curved surface membrane disc is 56-670 mu epsilon, and the strain distribution range in the curved surface area is 335-391 mu epsilon, which is basically in a uniform distribution state.

It can be seen that the performance of the sine-wave curved film disk is superior to that of the circular arc curved film disk, and therefore the wave-shaped curved annular area of the present embodiment is a sine-wave curved surface.

Further, a plurality of layers of prepreg paving layers are arranged in the film disc body 1, two mutually perpendicular radial directions of the film disc body 1 are respectively 0 degree and 90 degrees, and all the prepreg paving layers at least comprise a 0-degree paving layer with a fiber direction of 0 degree, a 90-degree paving layer with a fiber direction of 90 degrees, a 45-degree paving layer with a fiber direction of 45 degrees and a-45-degree paving layer with a fiber direction of-45 degrees.

In the embodiment, the prepreg laying layer form in the film disc body 1 is obtained by laying layer design and analysis on the sine wave curved surface film disc: [0 °/45 °/90 °/90 °/45 °/0 °/0 °/45 °/90 °/90 °/45 °/0 ° ]]_S. Specifically, the design and analysis modes of the prepreg layup are as follows:

1) analyzing the influence of ply angle

The influence of different layering angles on the torque transmission capacity, the axial displacement compensation capacity and the angular displacement compensation capacity of the sine wave curved surface membrane disc is researched. Thus, there were designed a total of 7 skew-symmetrical ply patterns ([ + -. theta.) of different ply angles]_4S8 layers in total). Calculating and analyzing the skew symmetrical ply form ([0 °) of different ply angles by using numerical analysis software (ABAQUS)]_4S、[±15°]_4S、[±30°]_4S、[±45°]_4S、[±60°]_4S、[±75°]_4SAnd [90 DEG ]]_4S) The sine-wave toroidal disk of (1) has mechanical properties under the action of a torque T (T is 50kn.m), an axial displacement load D (D is 5mm), and a bending moment M (M is 0.06 kn.m).

a. Effect of Torque T

Fig. 6a and 6b show the calculation results of the maximum torsion angle and the axial displacement of the sine wave curved surface film disk in different skew symmetrical ply forms along with the change of the skew ply angle under the action of the same torque T (T is 50 kn.m). Under the condition of oblique symmetrical laying, the sine wave curved surface film discs with different oblique laying angles adopt +/-45 DEG under the action of the same torque T when the curved surface film discs are laid at the same angle]_4SWhen the oblique symmetrical layering form is adopted, the change of the torsion angle and the axial displacement generated on the curved surface membrane discThe amount of distortion is minimal, indicating that the angled ply form may provide a curved membrane disc with a high torque carrying capacity. Therefore, the ply angle may be considered in the ply design of a sine wave curved membrane disc.

b. Effect of axial displacement load D

Under the same axial displacement load D being 5mm, the maximum stress in each layer of the sine wave curved surface membrane disc in the form of various oblique symmetrical layers is shown in FIG. 7. Under the condition of oblique symmetrical laying, the maximum stress in each laying layer of the sine wave curved surface film discs with different oblique symmetrical laying angles is in a symmetrical distribution form along the middle surface (the 4 th layer) of the laying layer under the action of an axial displacement load D of 5mm, and the maximum stress in the upper outer surface layer and the lower outer surface layer (namely the 1 st layer and the 8 th layer) of the sine wave curved surface film discs are in a symmetrical distribution form along the middle surface (the 4 th layer) of the laying layer; the maximum stress in each paving layer in the sine wave curved surface membrane disc in the oblique symmetrical paving layer forms of 60 degrees, 75 degrees and 90 degrees is not symmetrically distributed; fig. 7 also shows that: [0 degree ]]_4SStress generated in each layer of the sine wave curved surface membrane disc which is symmetrically paved in an oblique mode is the minimum. That is, in the axial displacement compensation process, the axial compensation capacity of the sine wave curved surface membrane disc can be increased by adding the 0 ° layer, so in the layer design of the sine wave curved surface membrane disc, the 0 ° layer should be considered.

Further, [0 ° ]]_4sAnd [90 ° ]]_4sThe stress distribution of the composite sine-wave curved membrane disc which is obliquely and symmetrically laid under the action of the axial displacement load D (D is 5mm) is shown in FIGS. 8a and 8 b. Compared with [90 ° ]]_4SSine wave curved surface film disk laid in skew symmetry at 0 °]_4SThe stress in the curved surface area of the sine wave curved surface membrane disc which is obliquely and symmetrically laid is basically uniformly distributed, so that the laying of 0-degree laying layer is considered in the laying layer design of the sine wave curved surface membrane disc.

c. Effect of bending moment T

When the same bending moment M is applied, the maximum stress in each layer of the sine-wave curved-surface film disk in the form of various oblique symmetrical layers under the load is shown in fig. 9. In the case of diagonal symmetrical laying, different diagonal symmetrical laying anglesUnder the action of bending moment M, the maximum stress in each paving layer of the sine wave curved surface membrane disk in various oblique symmetrical paving layer forms is in an asymmetrical distribution form along the paving layer, and the stress from the first layer to the surface layer is increased in sequence. [0 degree ]]_4SThe stress in the sine wave curved surface membrane disc which is symmetrically paved in an oblique mode is the minimum. The stress distribution of each layer is in a similar distribution form when the layer is arranged at an angle of less than 45 degrees; [90 ° ]]_4SStress distribution of each layer in the sine wave curved surface membrane disc which is symmetrically paved in an oblique intersection way is relatively uniform.

2) Analysis of the influence of different ply angle ratios

And analyzing the influence of different layering angle proportions on the transmission torque, the axial displacement compensation and the angular displacement compensation capability of the composite material sine wave curved surface membrane disc. 10 composite material sine wave curved surface membrane discs in the form of 0 degrees, 90 degrees and 45 degrees soil layers (16 layers in total) are designed, but the proportions of different layer angles in various layer forms are different, as shown in table 1,

TABLE 1 different ply angle ratio settings

The mechanical properties of the composite material sine wave curved surface membrane disc with different layer types of No. 1-10 in the table below are respectively acted by analyzing and calculating different loads (torque T, axial displacement load D and bending moment load M) by using numerical analysis software (ABAQUS).

a. Effect of Torque T

The maximum twist angle produced on the composite sine wave toroidal discs at various ply angle ratios in the table under the same torque T (T ═ 50kn. m) is shown in fig. 10. The torsion angles of the sine wave curved surface film discs in 1, 2, 3 and 4 ply forms (only 0 ° (radial direction) and 90 ° (circumferential direction) ply angles) are the largest under the action of the torque T being 50KN.m, and the torsion angles of the sine wave curved surface film discs in the four ply forms are basically consistent, which shows that the capacity of the sine wave curved surface film discs for transmitting the torque is low and cannot be changed along with the change of the proportion of the two ply angles when only the 0 ° and the 90 ° ply angles are provided; 5-10 sine wave curved surface film discs in the form of the layers generate smaller torsion angles under the action of torque T and are reduced along with the increase of the content of the 45-degree layers; and it can be seen that the twist angles of the sinusoidal curved film discs in the form of the two sets of plies 6 and 7, 8 and 9 are substantially equal, i.e. the ability of the sinusoidal curved film discs to transmit torque does not change with changes in the 0 ° and 90 ° ply proportions when the content of the 45 ° ply is constant. Therefore, in the layer design of the sine wave curved surface film disc, in order to enable the sine wave curved surface film disc to have high capacity of transmitting torque, the content of 45-degree layer in the layer of the composite sine wave curved surface film disc is ensured.

b. Effect of axial displacement load D

The results of the calculation of the axial stiffness of the composite material sine wave curved surface membrane discs of various ply angle ratios in the table under the action of the same axial direction load D are shown in fig. 11. The axial stiffness of the composite sine wave camber film disk of the ply angle ratio No. 4 (i.e., a full 0 ° ply, i.e., the radial direction of the fibers along the disk surface of the flexible element) is the greatest, and the axial stiffness of the composite sine wave camber film disk of the ply angle ratios No. 5 and No. 10 (without a 0 ° ply) is the least, i.e., in the ply design of the sine wave camber film disk, if no 0 ° ply is present, the axial stiffness of the structure will be reduced. In addition, in various ply angle ratios, as the 0 ° ply ratio increases, the axial stiffness of the structure increases. Therefore, the proportion of 0-degree layering is considered in the layering design of the composite material sine wave curved surface membrane disc, and the axial compensation capability of the sine wave curved surface membrane disc is improved under the condition of ensuring the strength and the torsional rigidity of the sine wave curved surface membrane disc.

c. Effect of bending moment M

Under the same bending moment load M, the calculation results of the angular compensation capability of the composite material sine wave curved surface membrane disc with different ply angle ratios in the table are shown in FIG. 12. When the composite sine wave curved surface film disc only contains 0-degree and 90-degree layers, namely the layer laying form of 1, 2, 3 and 4, the angular compensation capacity of the sine wave curved surface film disc is gradually reduced along with the increase of the 0-degree layers; when the layering contains a layering angle of 45 degrees in a certain proportion, the change of the layering proportion of 0 degrees and 90 degrees has no obvious influence on the angular compensation capability of the composite material sine wave curved surface membrane disc; when the ply angle is not 0 degrees (only 45 degrees and 90 degrees plies, namely 5 and 10 ply forms), the angular compensation capacity of the composite sine wave cambered film disc is obviously increased. It can be seen from this that: the proportion of the 0-degree layer in the layer form of the sine wave curved surface film disc has obvious influence on the angular compensation capability of the sine wave curved surface film disc, and the layer design needs to be fully considered. Furthermore, from the design process of composite material propeller shafts it is known that: the 90 ° ply may improve the torsional yield of the structure. Therefore, in order to avoid the buckling phenomenon of the sine wave curved surface membrane disc in the process of transmitting the torque, the proportion of 90-degree layering is properly considered in the layering design process.

In summary, in this embodiment, according to the calculation and analysis results of the above-mentioned layer angle and different layer angle ratios on the influence of the composite material sine wave curved surface film disk transmission torque and the capability of performing axial displacement compensation and angular displacement compensation, the layer design of the composite material sine wave curved surface film disk is performed according to the general principle of laminate design, so as to realize the capabilities of the composite material sine wave curved surface film disk transmission torque and the axial displacement compensation and angular displacement compensation, and the layer form of the composite material sine wave curved surface film disk designed through repeated calculation is:

[0°/45°/-45°/90°/90°/-45°/45°/0°/0°/45°/-45°/90°/90°/-45°/45°/0°]S

the strain distribution of the composite material sine wave curved surface membrane disc with the layer design under the action of the torque T of 50kN.m is shown in fig. 13.

The strain distribution of the composite material sine wave curved surface membrane disc with the layer design under the action of the axial displacement load D (D is 5mm) is shown in FIG. 14.

The strain distribution of the composite flex element of the ply design under bending moment load M (M ═ 0.1kn. M) is shown in fig. 15.

The stress and strain distribution of the composite sine-wave curved-surface membrane disc with the layer design under the combined action of three loads, namely a torque T of 50kN.m, a bending moment M of 0.1kN.m and an axial displacement load D of 5mm, is shown in fig. 16.

From the above analysis and calculation processes (fig. 13-16), it can be known that the maximum strain generated by the composite material sine wave curved surface membrane disc in the form of the ply layer under the action of each single load (torque T is 50kn.m, bending moment M is 0.1kn.m, and axial displacement load D is 5mm) and the composite load, that is, the three loads act simultaneously satisfies the strength performance of the used composite material (the composite material structure usually adopts the maximum strain criterion for the structural strength, and generally, the failure strain is 5000 to 8000 μ ∈ as the judgment basis). FIG. 17 is a schematic view showing the direction of the mat in the present embodiment.

Fig. 18 is a schematic structural diagram of an embodiment of a hot-press forming die for a composite material corrugated film disc. The hot-press forming die for the composite material corrugated film disc comprises an upper die 11 and a lower die 12. A hot-press molding cavity 13 for hot-press molding of the corrugated film disc is arranged between the upper die 11 and the lower die 12, the hot-press molding cavity 13 comprises a corrugated surface molding area 14 for hot-press molding of the corrugated surface annular area 3, an inner connecting ring molding area 15 for molding the inner connecting ring 4 is arranged on the inner side of the corrugated surface molding area 14, and an outer connecting ring forming area 17 for molding the outer connecting ring 6 is arranged on the outer side of the corrugated surface molding area; an inner embedded component 16 for forming the inner connecting holes 5 is arranged in the inner connecting ring forming area 15, and an outer embedded component 18 for forming the outer connecting holes 7 is arranged in the outer connecting ring forming area 17. The hot-press forming requirement of the composite material corrugated film disc can be met by arranging the hot-press forming cavity 13 between the upper die 11 and the lower die 12 and arranging the inner embedded component 16 and the outer embedded component 18.

Further, the upper die 11 and the lower die 12 of the present embodiment are both made of 7075-T651 aluminum alloy. The 7075-T651 aluminum alloy has high strength and good mechanical properties. The hot-press forming cavity 13 of the embodiment is internally provided with a 3-degree demoulding inclination. A3-degree inclination is processed in the cavity, and a numerical control milling machine is used for finish milling to reach a certain precision level. When the resin plastic shrinks by heat, the adhesion force decreases. There is the possibility of automatic demoulding.

Further, the inner embedded component 16 and the outer embedded component 18 of the embodiment adopt embedded components with the same structure, the embedded components include embedded heads 19, the upper surface of the lower die 12 is provided with counter bores 20, the hole bottoms of the counter bores 20 are provided with through holes 21, the embedded heads 19 include lower end heads 19a positioned in the inner counter bores 20 and upper end heads 19b positioned above the lower end heads 19a, the outer diameter of the lower end heads 19a is equal to the inner diameter of the counter bores 20, the thickness of the lower end heads is equal to the depth of the counter bores 20, the outer diameter of the upper end heads 19b is equal to the inner diameter of the corresponding inner connecting holes 5 or outer connecting holes 7, the height of the upper end heads 19b is greater than or equal to the height of the corresponding inner connecting ring forming areas 15 or outer connecting ring forming areas 17, the lower surface of the upper die is provided with relief holes 22 corresponding to the embedded heads 19 one by one to one, the embedded connecting screws 23 are arranged in the through holes 21 and are, that is, the inner embedded component 16 and the outer embedded component 18 of the embodiment are detachable, and the upper end 19b can be replaced according to different inner connecting holes 5 and outer connecting holes 7, so that the applicability is better.

Further, the hot press forming die for the composite material corrugated film disc of the embodiment further comprises a demoulding assembly and a guiding assembly; the demolding assembly includes threaded through holes 24 provided at four diagonal positions of the upper mold 11 and demolding screws 25 threadedly engaged with the threaded through holes 24; the guide assembly comprises a guide post 26 arranged on the upper surface of the lower die 12, and a guide hole 27 is arranged on the upper die 11 corresponding to the guide post 26.

The composite material corrugated film disc hot press molding method comprises the following steps:

1) cutting the prepreg into needed figures with different angles to obtain a prepreg paving layer, and drawing the fiber direction of the prepreg paving layer;

2) laying a film disc, heating the prepreg paving layer obtained by cutting, laying loose prepreg paving layers according to a design paving form when the prepreg paving layers are softened to facilitate laying, and finally laying into a film disc paving layer compact body with a regular shape; the heating temperature of the prepreg lay-up of this example was 30 °.

3) Closing the die and curing, closing the upper die 11 and the lower die 12, placing the film disc laying compact body in a hot-press molding cavity 13, and then heating and curing the film disc laying compact body to obtain a composite material corrugated film disc;

the thermosetting plastic is cured at the molding temperature for a period of time to achieve the desired degree of crosslinking by polycondensation of the resin and to provide the desired physical and mechanical properties to the article. The plastic with low curing rate can be cured temporarily when the product can be completely demoulded, and then the whole curing process is completed by post-treatment; so as to improve the utilization rate of the equipment. The mould pressing curing time is usually the holding pressure and heat preservation time, generally ranging from 30 seconds to several minutes, and mostly not more than 30 minutes. Too long or too short a curing time has an effect on the properties of the article.

4) And (3) demolding, namely demolding the upper mold 11 and the lower mold 12, and taking the obtained composite material corrugated film disc out of the hot-press molding cavity 13.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.