阅读说明：本技术 电缆组件模压埋入复合材料的方法 (Method for embedding composite material into cable assembly through mould pressing ) 是由 刘潇龙 阎德劲 李乐 杨超 于 2021-06-30 设计创作，主要内容包括：本发明公开的一种电缆组件模压埋入复合材料的方法。旨在节约电子装备布线空间埋入复合材料。本发明通过下述方法实现：电缆组件在埋入前,采用等离子处理工艺对线缆表皮进行处理；模压埋入时,先在上模具、下模具型腔涂脱模剂,晾干后将裁减好的复合材料预浸料在下模具上铺层至1/2厚度后铺设埋入线缆,线缆使用下模具V型槽定位并在出线口处安装隔板以防止溢胶,线缆铺设后施加1N～3N张力并使用胶膜固定；之后继续完成剩余1/2厚度预浸料铺层,然后将上模具与下模具进行压合,并在模压机上进行模压固化；固化后,在埋入复合材料构件上安装过渡板及连接器,将埋入线缆与连接器进行装联实现互通,最终完成模压埋入复合材料电缆组件制作。(The invention discloses a method for embedding a composite material into a cable assembly by die pressing. Aims to save the wiring space of electronic equipment and embed composite materials. The invention is realized by the following method: before the cable assembly is buried, the cable skin is treated by adopting a plasma treatment process; when the mould is pressed and embedded, firstly, coating a release agent on the cavities of the upper mould and the lower mould, laying a cut composite material prepreg on the lower mould to 1/2 thickness after drying, laying and embedding a cable, positioning the cable by using a V-shaped groove of the lower mould, installing a partition plate at an outlet to prevent glue overflow, applying 1N-3N tension to the cable after laying and fixing the cable by using a glue film; continuously finishing the prepreg paving layer with the residual 1/2 thickness, then pressing the upper die and the lower die, and carrying out die pressing and curing on a die press; after solidification, a transition plate and a connector are installed on the embedded composite material component, the embedded cable and the connector are assembled and communicated, and finally the manufacture of the molded embedded composite material cable assembly is completed.)

1. A method for embedding a composite material into a cable assembly by die pressing is characterized by comprising the following specific technical characteristics: the cable (1) adopts a high-temperature-resistant model with an outer skin made of polytetrafluoroethylene material, a compression molding die is formed by an upper die (2) and a lower die (4) which are provided with an upper cavity and a lower cavity, a yielding boss for installing and connecting a positioning notch of a molding connector (6) is designed on the lower die (4), and a V-shaped groove is designed on a cable extending end enclosure frame bearing frame of the lower die (4) and is used for centering and positioning when the cable (1) is laid; before mould pressing embedding, the surface of the cable (1) is treated by adopting a plasma treatment process so as to increase the surface energy of the cable and improve the bonding strength of the surface and a composite material matrix interface; when the die is pressed and embedded, firstly coating a release agent on the surfaces of an upper die (2) and a lower die (4), after the compound material prepreg (3) is dried, filling the cut compound material prepreg (3) into a groove of the lower die (4), laying and embedding a cable (1) when the bottom layer prepreg (3) is laid to the thickness of the groove 1/2 according to the designed sequence, direction and layer number, positioning the cable (1) by using a V-shaped groove on a groove enclosing frame of the lower die (4), installing a partition plate (5) at an outlet to prevent glue overflow, and applying 1N-3N tension and fixing the cable (1) by using a glue film after laying; after the cable (1) is buried and laid, continuously using a composite material prepreg (3) to finish the laying of the residual space 1/2, coating the cable (1) in upper and lower cavities of an upper die (2) and a lower die (4) by using the composite material prepreg (3), then pressing the upper die (2) and the lower die (4), and carrying out die pressing and curing on a die pressing machine; and finally, installing a transition plate (7) and a connector (6) on the solidified and formed embedded composite material component (9), assembling the embedded cable (1) and the connector (6) at the positioning gap of the embedded composite material component (9) to realize intercommunication, filling the positioning gap with epoxy glue (8) for protection after assembly, and finally finishing the manufacture of the die-pressing embedded composite material cable assembly.

2. The method of claim 1, wherein the cable assembly is molded with an embedded composite material, and further comprising: before the cable (1) is embedded in a mould pressing manner, the surface of the cable (1) needs to be treated by adopting a plasma treatment process: and (2) performing plasma treatment in a nitrogen atmosphere in a vacuum chamber environment with the system vacuum degree of 30KPa, wherein the nitrogen flow is 900L/min, the plasma power is 5000W, the treatment time is 40min, the surface energy of the outer skin of the polytetrafluoroethylene material is enhanced after the plasma treatment, and the interface strength between the embedded cable (1) and the composite material matrix is improved.

3. The method of claim 1, wherein the cable assembly is molded with an embedded composite material, and further comprising: in the process of embedding the cable (1) into the composite material, firstly, laying layers on a lower die (4) of the cut composite material prepreg (3) according to a design angle to 1/2 thickness, then laying the cable (1), positioning the cable (1) on the lower die (4) by using a V-shaped groove, installing a partition plate (5) at a cable outlet to prevent glue overflow, extending out of two ends of the cable (1) for a reserved length of more than or equal to 25mm, applying 1N-3N tension to two ends of the cable (1) after laying, adhering the two ends by using a glue film, finishing the filling of the rest 1/2 thickness laying layers by using the composite material prepreg (3), keeping the fiber direction of the composite material prepreg (3) on a contact layer with the cable (1) consistent with the direction of the cable (1), and pressing the upper die (2) and the lower die (4) after the laying layers are finished.

4. The method of claim 1, wherein the cable assembly is molded with an embedded composite material, and further comprising: in the process of mould pressing and curing, the upper mould (2) and the lower mould (4) are heated to 100 ℃, the initial pressure is given to be 0.1MPa, and the temperature is kept for 30 min; then adjusting the pressure to 0.5 MPa-0.6 MPa; heating to 130 +/-5 ℃, and keeping the temperature for 120 +/-10 min, wherein the heating rate is 3 ℃/min in the process; and naturally cooling after solidification and forming.

5. The method of claim 1, wherein the cable assembly is molded with an embedded composite material, and further comprising: when the connector (6) is installed on the embedded composite material component (9), the transition plate (7) is installed on the embedded composite material component (9), then the connector (6) is installed on the transition plate (7), the wiring end of the connector (6) is located at the reserved positioning gap, the embedded cable (1) and the connector (6) are subjected to wiring and welding at the positioning gap, interconnection is achieved, and finally the reserved positioning gap is filled with epoxy glue (8) for protection.

Technical Field

The invention belongs to the technical field of cable manufacturing, and particularly relates to a method for embedding a composite material into a cable assembly through mould pressing.

Background

The cable assembly is used in various electronic information systems in the fields of aviation, aerospace and the like, and can realize impedance matching and energy transmission of electric signals and microwave signal transmission paths between or inside equipment. Plays an important role in guaranteeing the improvement of the working performance of various electronic equipment. In the development process of electronic equipment, how to reasonably design and arrange cables is an important research topic. For electronic equipment with complex functions and high integration level, electrical interfaces are various, and electronic equipment at a system level usually needs thousands of cables to realize interconnection and intercommunication among complete machines. In the fields of aerospace and aviation, requirements on load weight and volume indexes are more and more strict, and corresponding electronic equipment tends to develop in the directions of integration, miniaturization, light weight and the like, so that complex cable assemblies are difficult to arrange in narrow spaces inside the electronic equipment, the cables are often interfered with structural parts or circuit components during assembly, the wiring manufacturability of the electronic equipment is poor, quality hidden dangers exist, and the problems are difficult to solve by the traditional cable manufacturing and arranging method.

The invention provides a method for manufacturing an embedded cable assembly based on a composite material mould pressing curing process, wherein the fiber reinforced resin matrix composite material is used as a light high-strength material and is increasingly applied to manufacturing structural parts of electronic equipment, the structural parts of the composite material are manufactured by adopting a process of curing and forming after prepreg laying, the interior of the material has designability, for example, a cable is embedded into the structural parts of the electronic equipment in advance and a connector interface is reserved, and circuit parts can be assembled with the structural parts of the composite material to realize electrical interconnection, so that the wiring space of the electronic equipment can be effectively saved, and the integrated, miniaturized and light-weight development of the electronic equipment is promoted.

Disclosure of Invention

The invention aims to provide a method for manufacturing a cable assembly mould pressing embedding composite material, which can effectively save wiring space of electronic equipment and promote miniaturization, light weight and integration development of the electronic equipment, aiming at the problems that the wiring of the electronic equipment in a small space is difficult and the quality is hidden. The method mainly utilizes a special process method of curing and forming after laying layers of the composite material structural member of the electronic equipment, the cable is embedded into the composite material structural member, and a connector interface is reserved, so that circuit parts and components can be electrically interconnected through assembling with the composite material structural member.

In order to achieve the above object, the present invention provides a method for embedding a composite material into a cable assembly by die pressing, which has the following technical characteristics: the cable 1 adopts a high-temperature resistant model with an outer skin made of polytetrafluoroethylene material, a compression molding mold is formed by an upper mold 2 and a lower mold 4 which are provided with upper and lower cavities, a yielding boss for installing a positioning notch of a molding connector 6 is designed on the lower mold 4, and a V-shaped groove is designed on a cable extending end enclosure frame bearing frame of the lower mold 4 and is used for centering positioning when the cable 1 is laid; before mould pressing embedding, the surface of the cable 1 is treated by adopting a plasma treatment process so as to increase the surface energy of the cable and improve the bonding strength of the surface and a composite material matrix interface; when the die is pressed and embedded, firstly coating a release agent on the surfaces of an upper die 2 and a lower die 4, after the composite material prepreg 3 is dried, filling the cut composite material prepreg 3 into a groove of the lower die 4, paving and embedding a cable 1 when the bottom prepreg 3 is laid to the thickness of the groove 1/2 according to the designed sequence, direction and layer number, positioning the cable 1 by using a V-shaped groove on a groove surrounding frame of the lower die 4, installing a partition plate 5 at an outlet to prevent glue overflow, and fixing the cable 1 by using a glue film and applying 1N-3N tension after the cable 1 is laid; after the cable 1 is buried and laid, continuously using a composite material prepreg 3 to finish the laying of the residual space 1/2, coating the cable 1 in upper and lower cavities of an upper die 2 and a lower die 4 by using the composite material prepreg 3, then pressing the upper die 2 and the lower die 4, and carrying out die pressing and curing on a die press; and finally, installing a transition plate 7 and a connector 6 on the solidified and formed embedded composite material component 9, assembling the embedded cable 1 and the connector 6 at the positioning gap of the embedded composite material component 9 to realize intercommunication, filling the positioning gap with epoxy glue 8 for protection after assembly, and finally finishing the manufacture of the molded and embedded composite material cable assembly.

Compared with the traditional cable assembly manufacturing and laying method, the invention has the following beneficial effects:

according to the invention, by utilizing the designability of the forming process of the composite material structural part of the electronic equipment, the cable is embedded into the composite material structural part and then is molded and cured, and the connector is assembled to manufacture the molded and embedded composite material cable component, namely, the cable component is embedded into the composite material structural part of the electronic equipment in advance, and the circuit parts can be assembled with the composite material structural part to realize electrical interconnection, so that the circuit parts can be assembled with the composite material structural part to realize electrical interconnection, and the wiring space of the electronic equipment is effectively saved.

Before the cable is buried, the outer surface of the cable is subjected to plasma treatment, so that the bonding strength of the cable surface and the interface of the composite material matrix is effectively improved; in the process of cable embedding and composite material curing, the mold is designed, the mold can realize the positioning of cable embedding and laying, and the curing and forming precision of the composite material can be ensured; in the connector assembly process, the assembly welding positioning gap is designed and reserved, so that the connector can be conveniently assembled and connected with the embedded cable; the process method has good stability and good batch producibility.

According to the invention, by utilizing a special process method of curing and forming after laying layers of the composite material structural member of the electronic equipment are coated, the cable is embedded into the composite material structural member, and the connector interface is reserved, so that the circuit parts can be electrically interconnected through being assembled with the composite material structural member, the wiring space of the electronic equipment is effectively saved, the forming process is simple, the mechanization and the automation are easy, and the forming can be carried out even without skilled workers. The molded product has accurate size, smooth surface, good appearance and size repeatability, one-step molding of a complex structure and no damage to the product during secondary processing.

Drawings

Fig. 1 is a process flow diagram of the molding of an embedded composite material for a cable assembly according to the present invention.

FIG. 2 is a schematic cross-sectional view of the insert molding process of the present invention.

FIG. 3 is a three-dimensional view and a partially enlarged schematic view of the lower mold of the present invention.

Fig. 4 is a sectional view taken along the line a-a of fig. 3 and a partially enlarged view.

Fig. 5 is a sectional view and a partially enlarged view taken along line B-B of fig. 3.

Fig. 6 is a schematic view of the connector assembled with an embedded composite cable.

In the figure: the cable comprises a cable 1, an upper die 2, a composite prepreg 3, a lower die 4, a partition plate 5, a connector 6, a transition plate 7, epoxy glue 8 and a composite member 9 embedded in the composite material.

Detailed Description

See fig. 1-6. According to the invention, the cable 1 adopts a high-temperature resistant model with an outer skin made of polytetrafluoroethylene material, a compression molding mold is formed by an upper mold 2 and a lower mold 4 which are provided with an upper cavity and a lower cavity, a yielding boss for installing a positioning notch of a molding connector 6 is designed on the lower mold 4, and a V-shaped groove is designed on a bearing frame of a cable extending end enclosure frame of the lower mold 4 for centering positioning when the cable 1 is laid; before mould pressing embedding, the surface of the cable 1 is treated by adopting a plasma treatment process so as to increase the surface energy of the cable and improve the bonding strength of the surface and a composite material matrix interface; when the die is pressed and embedded, firstly coating a release agent on the surfaces of an upper die 2 and a lower die 4, after the composite material prepreg 3 is dried, filling the cut composite material prepreg 3 into a groove of the lower die 4, paving and embedding a cable 1 when the bottom prepreg 3 is laid to the thickness of the groove 1/2 according to the designed sequence, direction and layer number, positioning the cable 1 by using a V-shaped groove on a groove surrounding frame of the lower die 4, installing a partition plate 5 at an outlet to prevent glue overflow, and applying 1N-3N tension and fixing the cable 1 by using a glue film after the cable 1 is laid; after the cable 1 is buried and laid, continuously using a composite material prepreg 3 to finish the laying of the residual space 1/2, coating the cable 1 in upper and lower cavities of an upper die 2 and a lower die 4 by using the composite material prepreg 3, then pressing the upper die 2 and the lower die 4, and carrying out die pressing and curing on a die press; and finally, installing a transition plate 7 and a connector 6 on the solidified and formed embedded composite material component 9, assembling the embedded cable 1 and the connector 6 at the position of the positioning gap of the embedded composite material component 9 to realize intercommunication, filling the positioning gap with epoxy glue 8 to protect after assembly, and finally finishing the manufacture of the molded and embedded composite material cable assembly.

The cable 1 skin is treated by adopting a plasma treatment process: and under the vacuum chamber environment with the system vacuum degree of 30KPa, performing plasma treatment in a nitrogen atmosphere, wherein the nitrogen flow is 900L/min, the plasma power is 5000W, the treatment time is 40min, the surface energy of the outer skin of the polytetrafluoroethylene material is enhanced after the plasma treatment, and the interface strength between the embedded cable 1 and the matrix of the composite material is improved.

See fig. 3-5. In the process of embedding the cable 1 into the composite material, firstly laying a cut composite material prepreg 3 on a lower die 4 according to a design angle to 1/2 thickness, then laying the cable 1, positioning the cable 1 on the lower die 4 by using a V-shaped groove, installing a partition plate 5 at an outlet to prevent glue overflow, extending out of two ends of the cable 1 for a reserved length of more than or equal to 25mm, applying 1N-3N tension to two ends of the laid cable 1, adhering and fixing by using a glue film, then finishing laying and filling with the residual 1/2 thickness by using the composite material prepreg 3, keeping the fiber direction of the composite material 3 on a contact layer of the cable 1 consistent with the direction of the cable 1, and pressing an upper die 2 and the lower die 4 after laying.

In the process of mould pressing and curing, the upper mould 2 and the lower mould 4 are heated to 100 ℃, the initial pressure is given to be 0.1MPa, and the temperature is kept for 30 min; then adjusting the pressure to 0.5 MPa-0.6 MPa; heating to 130 +/-5 ℃, and keeping the temperature for 120 +/-10 min, wherein the heating rate is 3 ℃/min in the process; and naturally cooling after solidification and forming.

See fig. 6. When the connector 6 is installed on the embedded composite material component 9, the transition plate 7 is installed on the embedded composite material component 9, then the connector 6 is installed on the transition plate 7, the wiring end of the connector 6 is located at the reserved positioning gap, the embedded cable 1 and the connector 6 are subjected to wire bonding and welding at the positioning gap, interconnection is achieved, and finally the reserved positioning gap is filled with epoxy glue 8 for protection.

The foregoing is a detailed description of the invention with reference to specific preferred embodiments, and no attempt is made to limit the invention to the particular embodiments disclosed, or modifications and equivalents thereof, since those skilled in the art will recognize that various changes may be made without departing from the spirit and scope of the invention as defined by the appended claims.