CN217943908U - Low-stress composite material embedded metal part structure - Google Patents
Low-stress composite material embedded metal part structure Download PDFInfo
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- CN217943908U CN217943908U CN202220885852.3U CN202220885852U CN217943908U CN 217943908 U CN217943908 U CN 217943908U CN 202220885852 U CN202220885852 U CN 202220885852U CN 217943908 U CN217943908 U CN 217943908U
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Abstract
The utility model relates to a low stress combined material embedded metal spare structure, including metal built-in fitting, cladding combined material layer around the metal built-in fitting, all process flutedly on every connection face of metal built-in fitting and combined material layer contact, lay the transition layer in the recess, the transition layer sets up between metal built-in fitting and combined material layer, and supreme first rete, chopped fiber layer, the second rete of being in proper order are followed to the transition layer. This structure is through designing the transition layer at metalwork and combined material interfacial, the transition layer adopts glued membrane and chopped strand, metalwork surface design recess control transition layer thickness, utilize the transition layer to coordinate at the deformation of the compound material shaping after solidification cooling process, eliminate metalwork and combined material coefficient of thermal expansion mismatch, produce the problem of internal stress after the solidification, solve the too big problem that produces deformation and interface clearance of combined material goods internal stress that has pre-buried metalwork, improve combined material finished piece dimensional stability.
Description
Technical Field
The utility model belongs to combined material structural design field involves the combined material product design that has pre-buried metalwork, especially a low stress combined material pre-buried metalwork structure.
Background
Most of composite material products utilize metal parts as processing and assembling interfaces. In the design process of the composite material product, in order to ensure that the product has a compact structure, improve the bearing capacity and reduce the number of assembly connecting pieces, the metal piece is often designed to be embedded in the inner structure of the composite material, and the metal piece with the structure is completely wrapped by the composite material. However, since the composite material is molded and cured at a relatively high temperature, the thermal expansion coefficient of the metal part is higher than that of the composite material, the deformation amount of the metal part is larger than that of the composite material after the curing is finished and the temperature is reduced to room temperature, stress exists at the interface of the composite material and the metal part, and if the ultimate stress is reached, microscopic gaps are generated between the metal part and the composite material or the metal part is deformed, so that the secondary processing precision and the stability of the long-term use size and form and position tolerance of the product are influenced.
In order to solve the problem of stress between the metal part and the composite material, a glue film is usually laid on the surface of the metal part in the processing process of the composite material product, but the glue film is used as a process layer, so that the pressure is high in the composite material forming process, the loss is high after curing, the thickness is not easy to control, and the solution effect is unstable.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, an object of the utility model is to provide a pre-buried metalwork structure of low stress combined material, this structure is through at metalwork and combined material interfacial design transition layer, the transition layer adopts glued membrane and chopped strand, metalwork surface design groove control transition layer thickness, utilize the transition layer to coordinate at the deformation of the compound material shaping after solidification cooling process, it does not match with the combined material coefficient of thermal expansion to eliminate metalwork, produce the problem of internal stress after the solidification, solve the problem that the combined material goods internal stress that has pre-buried metalwork excessively produces deformation and interfacial clearance, improve combined material finished piece dimensional stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a low stress combined material embedded metal spare structure, includes metal built-in fitting, the cladding is at the combined material layer around the metal built-in fitting, and the improvement of doing all processes the recess on every connection face of metal built-in fitting and combined material layer contact, lay the transition layer in the recess, the transition layer sets up between metal built-in fitting and combined material layer, and the transition layer is supreme first glue film layer, chopped fiber layer, the second glue film layer of being in proper order down.
As the optimization of the utility model, the metal embedded part comprises a hexahedron main body with a hollow structure inside, and six connecting surfaces of the hexahedron main body are provided with interface bosses or lightening holes according to actual needs; the metal embedded part is made of titanium alloy.
As the utility model discloses a preferred, the inside of recess is the structure of intercommunication, and the recess has the outer flange of round near the position of connecting face edge, and the recess has the flange in the round near the position of connecting the interface boss on the face or lightening hole, and the degree of depth of recess is 0.3mm.
As the utility model discloses an it is preferred, the combined material layer is carbon fiber reinforcement resin base combined material layer.
As the optimization of the utility model, the thickness of the first adhesive film layer and the second adhesive film layer is 0.35 mm-0.4 mm; the chopped fiber layer is made of glass fibers, the length of the glass fibers is 3-5 mm, the glass fibers are uniformly paved on the first adhesive film layer, and the coverage area is 50%.
As the utility model discloses a further preferred, first rete, second rete are LWF trade mark glued membrane, glass fiber's trade mark is HT469LB-1200R.
The utility model has the advantages as follows:
(1) The utility model discloses an establish the recess on the metal built-in fitting, establish the transition layer in the recess, utilize the transition layer to cool down the deformation of process after the compound material shaping solidification, eliminate the internal stress that produces after metal built-in fitting and the unmatched solidification of combined material coefficient of thermal expansion, solve the problem that the too big production of combined material goods internal stress that has pre-buried metalwork is deformed and interface clearance, improve combined material finished piece dimensional stability.
(2) The utility model discloses recess on the metal built-in fitting has the outer flange of round near the position of connecting the face edge, has the flange in the round near the position of connecting the face on interface boss or lightening hole, and outer flange, interior flange can prevent effectively that the high temperature curing process glued membrane from running off when becoming liquid, make glued membrane size control more accurate, realize the sufficient plastic deformation of thickness direction to the deformation of adaptation metalwork.
(3) The utility model discloses a transition layer sets up short fibre between two-layer glued membrane, along with the pressurization of forming process, intensification, solidification, short fibre can fully be infiltrated by the glued membrane, finally makes the transition layer have the toughness that is higher than the glued membrane, and the modulus that is less than combined material and metalwork, can be under the circumstances of guaranteeing bonding strength, eliminate most stress between metalwork and combined material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the low-stress composite material embedded metal part of the present invention;
fig. 2 is a cross-sectional view of the low-stress composite material embedded metal part of the present invention;
fig. 3 is a schematic structural view of a first angle of a first embedded metal part according to the present invention;
fig. 4 is a schematic structural view of a second angle of the first embedded metal part of the present invention;
fig. 5 is a schematic structural view of a third angle of the first embedded metal part of the present invention;
fig. 6 is a cross-sectional view of the transition layer of the present invention;
fig. 7 is a schematic structural view of a second kind of embedded metal part according to the present invention.
Wherein the reference numerals are: the composite material layer comprises a metal embedded part 1, a composite material layer 2, a transition layer 3, a groove 4, a hexahedral main body 11, an interface boss 12, a lightening hole 13, an upper connecting surface 111, a lower connecting surface 112, a left connecting surface 113, a right connecting surface 114, a front connecting surface 115, a rear connecting surface 116, a first glue film layer 31, a chopped fiber layer 32, a second glue film layer 33, an outer flange 41 and an inner flange 42.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 2, and fig. 6, the structure of the low-stress composite material embedded metal part in the embodiment includes a metal embedded part 1 and a composite material layer 2 coated around the metal embedded part, a groove 4 is formed on each connecting surface of the metal embedded part 1, which is in contact with the composite material layer 2, a transition layer 3 is laid in the groove, the transition layer 3 is disposed between the metal embedded part 1 and the composite material layer 2, and the transition layer 3 is a first glue film layer 31, a chopped fiber layer 32, and a second glue film layer 33 sequentially from bottom to top.
Referring to fig. 1 to 5, in the embodiment, the metal embedded part 1 includes a hexahedral main body 11 with a hollow interior, and six connection surfaces of the hexahedral main body are selectively provided with an interface boss 12 or a lightening hole 13 according to actual needs. An upper connecting surface 111 of a metal embedded part 1 provided in this embodiment is provided with an interface boss 12 and a lightening hole 13, a lower connecting surface 112 of the metal embedded part 1 is provided with two lightening holes 13, a left connecting surface 113 is provided with an interface boss 12, a right connecting surface 114 is provided with a lightening hole 13, and a front connecting surface 115 and a rear connecting surface 116 are not provided with the interface boss 12 and the lightening hole 13; the metal embedded part 1 is made of a titanium alloy material commonly used in aerospace, and has the mark TC4 and the density of 4.5g/cm 3 Coefficient of thermal expansion of 7.89X 10 -6 /℃。
Referring to fig. 3 to 5, in the embodiment, the interior of each groove 4 on each connecting surface of the metal embedded part 1 is a communicated structure, a circle of outer ribs 41 is arranged at the position of the groove 4 close to the edge of the connecting surface, a circle of inner ribs 42 is arranged at the position of the groove close to the interface boss 12 or the lightening hole 13 on the connecting surface, and the outer ribs 41 and the inner ribs 42 of the groove are used for preventing a high-temperature curing process and a glue film from losing when the glue film is turned into a liquid state; in addition, the depth of the groove 4 is 0.3mm, the thickness of the cured transition layer can be controlled to be 0.3mm, and compared with a metal embedded part without the groove, the size of an adhesive film is more accurately controlled, the adhesive film is extruded by prepreg to run off less, and sufficient plastic deformation in the thickness direction is realized to adapt to the deformation of the metal embedded part.
Further, in the embodiment, the composite material layer 2 is made of a carbon fiber reinforced resin-based composite material, the resin is cyanate ester resin with a 130 ℃ medium temperature curing formula, compared with a traditional high-temperature resin formula (cured at 180-190 ℃), the temperature is reduced to room temperature after curing, the thermal stress generated between the metal piece and the composite material is smaller, the reinforcing material is made of M40 JB-brand fibers, the composite material part has a thermal expansion coefficient of 1.23 multiplied by 10 according to a quasi-isotropic layering design, and the resin is made of a composite material with a thermal expansion coefficient of 1.23 multiplied by 10 -6 /℃。
Further, in the embodiment, the first adhesive film layer 31 and the second adhesive film layer 33 in the transition layer 3 are LWF (light weight fiber) brand adhesive films produced by petrochemical houses in Heilongjiang province, the thickness is 0.35 mm-0.4 mm, the curing temperature is 120-125 ℃, and the curing time is 2 h-3 h; the chopped fiber layer 32 in the transition layer 3 is made of glass fiber, the mark number of the glass fiber is HT469LB-1200R, when the transition layer is laid, 1 first glue film layer 31 is firstly laid in the groove 4 of the metal embedded part 1, then the glass fiber is cut into 3-5 mm in length and laid on the surface of the first glue film layer 31 to serve as the chopped fiber layer 32 (the glass fiber is uniformly covered by 50% of the area), and then 1 second glue film layer 33 is laid. With the pressurization, the temperature rise and the solidification of the forming process, the chopped fibers can be fully soaked by the glue film, and finally the transition layer has the toughness higher than that of the glue film and the modulus lower than that of the composite material and the metal piece, so that most of stress between the metal piece and the composite material can be eliminated under the condition of ensuring the bonding strength.
It should be noted that the metal embedded part 1 in this embodiment is not limited to the above-described structure, the interface bosses 12 and the lightening holes 13 on the metal embedded part 1 are selectively arranged according to actual needs, and specifically, the structure shown in fig. 7 is further included, that is, the metal embedded part 1 includes a hexahedral body, only one of the six connecting surfaces (top surface) of the hexahedral body is provided with two interface bosses 12, the other connecting surfaces are not provided with the interface bosses and the lightening holes, each connecting surface is provided with a groove 4, the inside of the groove 4 is a communicated structure, the groove 4 is provided with a circle of outer ribs 41 at a position close to the edge of the connecting surface, and the groove is provided with a circle of inner ribs 42 at a position close to the interface bosses 12 on the connecting surface.
The utility model discloses the single pre-buried metalwork combined material structure that figure 1 shows, TC4 is chooseed for use to the metalwork material, and wall thickness 15mm, recess 0.3mm, M40 JB/cyanate is chooseed for use to the combined material, and wall thickness 10mm, LWF is chooseed for use to the glued membrane, and thickness 0.35mm, chopped strand are glass fiber, glass fiber mark HT469LB-1200R.
In order to verify the utility model discloses the effect of above-mentioned pre-buried metalwork structure of combined material, the utility model discloses carry out nondestructive inspection with the pre-buried metalwork structure of combined material who lays the transition layer with the non-processing groove of the processing recess of figure 1 and lay the transition layer in the recess directly on the metalwork and carry out nondestructive inspection and detect, detect metalwork and compound material bonding area, the processing recess just lays the metalwork and the compound material bonding area of the pre-buried metalwork structure of combined material of transition layer 95% in the recess as a result, and the metalwork and the compound material bonding area 48% of the pre-buried metalwork structure of combined material who lays the transition layer on the metalwork are directly not processed the recess. The results demonstrate that: the glued membrane can effectively be avoided in groove structure's design to run off, makes the utility model provides a pre-buried metalwork structure of combined material can solve the too big problem that produces deformation, metalwork and combined material production interface clearance of combined material goods internal stress.
The above embodiments of the present invention are only examples, but the scope of the present invention is not limited thereto, and the scope of the present invention should be determined by the scope of the claims.
Claims (6)
1. The utility model provides a low stress combined material embedded metal spare structure, includes metal built-in fitting, the cladding at the combined material layer around the metal built-in fitting, its characterized in that all processes the recess on every connection face of metal built-in fitting and combined material layer contact, lay the transition layer in the recess, the transition layer sets up between metal built-in fitting and combined material layer, and the transition layer is supreme first glued membrane layer, chopped fiber layer, the second glued membrane layer of being in proper order down.
2. The structure of a low-stress composite material embedded metal part as claimed in claim 1, wherein the metal embedded part comprises a hexahedral body with a hollow structure inside, an upper connecting surface of the metal embedded part is provided with an interface boss and a lightening hole, a lower connecting surface of the metal embedded part is provided with two lightening holes, a left connecting surface is provided with an interface boss, and a right connecting surface is provided with a lightening hole; the metal embedded part is made of titanium alloy.
3. The structure of a low-stress composite material embedded metal part as claimed in claim 2, wherein the inside of the groove is a communicated structure, the groove has a circle of outer ribs at a position close to the edge of the connecting surface, the groove has a circle of inner ribs at a position close to the interface boss or the lightening hole on the connecting surface, and the depth of the groove is 0.3mm.
4. The structure of the low-stress composite material embedded metal part as claimed in claim 1, 2 or 3, wherein the composite material layer is a carbon fiber reinforced resin matrix composite material layer.
5. The low-stress composite material embedded metal part structure according to claim 1, 2 or 3, wherein the thicknesses of the first adhesive film layer and the second adhesive film layer are 0.35mm-0.4 mm; the chopped fiber layer is made of glass fibers, the length of the glass fibers is 3-5mm, the glass fibers are uniformly paved on the first adhesive film layer, and the coverage area is 50%.
6. The embedded metal part structure of low-stress composite material as claimed in claim 5, wherein the first and second glue film layers are LWF glue films, and the glass fiber is HT469LB-1200R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220885852.3U CN217943908U (en) | 2022-04-18 | 2022-04-18 | Low-stress composite material embedded metal part structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220885852.3U CN217943908U (en) | 2022-04-18 | 2022-04-18 | Low-stress composite material embedded metal part structure |
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| Publication Number | Publication Date |
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| CN217943908U true CN217943908U (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220885852.3U Active CN217943908U (en) | 2022-04-18 | 2022-04-18 | Low-stress composite material embedded metal part structure |
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| CN (1) | CN217943908U (en) |
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- 2022-04-18 CN CN202220885852.3U patent/CN217943908U/en active Active
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