阅读说明：本技术 一种复合材料圆管与闭孔泡沫芯材的胶接连接装置及方法 (Glue joint connecting device and method for composite material circular tube and closed-cell foam core material ) 是由 庄蔚敏 张迪彤 王祺源 陈沈 孙健 施宏达 于 2021-10-19 设计创作，主要内容包括：本发明公开了一种复合材料圆管与闭孔泡沫芯材的胶接连接装置,包括：定厚器,其可轴向移动的设置在所述复合材料圆管中,且所述定厚器的一端设置有第一通孔,另一端设置有与第一通孔相连通的开口容纳腔；其中,所述闭孔泡沫芯材设置在所述开口容纳腔中；上压头,其一端可移动的设置在所述开口容纳腔中且抵靠在所述闭孔泡沫芯材的一端,另一端穿过所述第一通孔；下压头,其卡合在所述复合材料圆管中且抵靠在所述定厚器的另一端；单向阀,其设置在所述下压头的轴心,用于向所述定厚器中注胶。本发明还公开了一种复合材料圆管与闭孔泡沫芯材的胶接连接方法,通过控制定厚器的旋转抽离速度和注胶速度,使胶层厚度尽可能均匀。(The invention discloses a glue joint connecting device of a composite material circular tube and a closed-cell foam core material, which comprises: the thickness fixing device is axially movably arranged in the composite material circular tube, one end of the thickness fixing device is provided with a first through hole, and the other end of the thickness fixing device is provided with an opening accommodating cavity communicated with the first through hole; wherein the closed cell foam core is disposed in the open receiving cavity; an upper pressure head, one end of which is movably arranged in the open accommodating cavity and is abutted against one end of the closed-cell foam core material, and the other end of which passes through the first through hole; the lower pressure head is clamped in the composite circular tube and abuts against the other end of the thicknesser; and the check valve is arranged at the axis of the lower pressure head and used for injecting glue into the thickness setter. The invention also discloses a glue joint method of the composite material circular tube and the closed-cell foam core material, and the thickness of the glue layer is made to be as uniform as possible by controlling the rotating drawing-out speed and the glue injection speed of the thickness setter.)

1. A glued joint device of combined material pipe and closed cell foam core material which characterized in that includes:

the thickness fixing device is axially movably arranged in the composite material circular tube, one end of the thickness fixing device is provided with a first through hole, the other end of the thickness fixing device is provided with an opening accommodating cavity communicated with the first through hole, and the outer wall of the thickness fixing device and the inner wall of the opening accommodating cavity are subjected to sand blasting treatment;

wherein the closed cell foam core is disposed in the open receiving cavity;

an upper pressure head, one end of which is movably arranged in the open accommodating cavity and is abutted against one end of the closed-cell foam core material, and the other end of which passes through the first through hole;

the lower pressure head is clamped in the composite circular tube and abuts against the other end of the thicknesser;

and the check valve is arranged at the axis of the lower pressure head and used for injecting glue into the thickness setter.

2. The apparatus for adhesively bonding a composite round tube to a closed cell foam core of claim 1 wherein said upper ram comprises:

a press block which is of a cylindrical structure and is movably arranged in the open accommodating cavity and is used for matching with the lower press head to limit the movement of the closed-cell foam core material;

the long shaft is coaxially and vertically arranged with the pressing block and can rotatably penetrate through the first through hole.

3. The apparatus for adhesively bonding a composite round tube to a closed cell foam core of claim 2 wherein the indenter further comprises:

the second through hole is arranged at the axle center of the lower pressure head;

the glue guide grooves are radially arranged on the surface of the lower pressure head close to the thickness setter at equal intervals;

wherein, the check valve is in interference fit with the second through hole.

4. The apparatus for adhesively bonding a composite round tube to a closed cell foam core of claim 3, further comprising:

a first groove annularly arranged on the circumference of the pressing block;

a first seal ring disposed in the first groove.

5. The apparatus for adhesively bonding a composite round tube to a closed cell foam core of claim 4, further comprising:

the second groove is annularly arranged on the circumference of the lower pressure head;

a second seal ring disposed in the second groove.

6. The apparatus for adhesively bonding a composite round tube to a closed cell foam core of claim 5, further comprising:

the pressure sensors are uniformly arranged on the surface of the pressing block close to the lower pressing head and used for detecting the change of the radial pressure value borne by the adhesive layer;

and the controller is connected with the pressure sensors, the upper pressure head, the thickness setter and the glue injection equipment and is used for receiving data and transmitting commands.

7. A method of adhesively bonding a composite round tube to a closed cell foam core, using the apparatus of any one of claims 1 to 6, comprising the steps of:

step one, placing the closed-cell foam core material into a containing cavity after low-temperature treatment, clamping the closed-cell foam core material by an upper pressure head and a lower pressure head, and standing;

secondly, after the closed-cell foam core materials are detected by the pressure sensors to extrude the thickness setter, the thickness setter is axially pulled away in the direction away from the closed-cell foam core materials, and glue is injected between the closed-cell foam core materials and the composite circular tube;

and step three, stopping injecting glue when the pressure reaches 2MPa, standing at normal temperature until the glue layer is solidified, and completing glue joint after the upper pressure head and the lower pressure head are reset.

8. The method of adhesively bonding a composite round tube to a closed-cell foam core of claim 7 wherein the difference between the outside diameter of the sizer and the diameter of the open receiving cavity is twice the thickness of the layer of glue.

9. The method for the adhesive bonding of the composite round tube and the closed-cell foam core material according to claim 8, wherein the speed of the glue injection is satisfied as follows:

in the formula, V_iFor speed of injecting glue, omega_iFor correction factor, T is ambient temperature, F_dIs a pressure value, D_bLength of closed cell foam core, p is density of adhesive, V_dThe axial drawing-off speed of the thicknesser.

10. A method of adhesively joining a composite round tube to a closed-cell foam core according to claim 9, wherein the rate of axial withdrawal of the sizer is such that:

where phi is the correction factor, D_oIs the length of the thickness fixer, f is the thickness fixer and the composite material circleThe friction of the tube, N is the initial volume of the closed cell foam core, and R is the diameter of the composite round tube.

Technical Field

The invention relates to the technical field of composite material circular tube glue joint, in particular to a glue joint device and method for a composite material circular tube and a closed-cell foam core material.

Background

Since the development of automobile lightweight technology, the thin-wall pipe is widely applied to various parts of an automobile body with remarkable crashworthiness and energy absorption capacity, compared with the traditional metal thin-wall pipe, the composite material thin-wall pipe has the advantages of light weight, energy absorption, high specific energy absorption and the like, but has severe stress fluctuation in the deformation process and weaker capacity of bearing non-axial load, aiming at the problem, metal core materials such as foam or honeycomb and the like are filled into the hollow thin-wall pipe in many projects, and the mechanical property of the hollow thin-wall pipe is effectively improved.

However, the most important in the preparation process of the foam-filled composite material thin-wall pipe is to realize effective combination between the core material and the outer thin-wall pipe and ensure the structural integrity of the foam core material during the combination process as much as possible. When the foam core material is a closed cell structure, a glue joint is often used in view of cost reduction and process simplification.

The adhesive bonding means that the foam core material is connected with the inner wall of the composite material thin-wall pipe by using an adhesive. Firstly, the inner wall of the thin-wall pipe and the outer wall of the core material are polished to increase the effective gluing area. And after the bonding is finished, the temperature is kept at room temperature or a certain temperature for a period of time to solidify the adhesive layer. However, the existing composite material circular tube cementing process has great defects. The glue layer is damaged in the filling process after the glue is coated and then filled, and the adhesive in the holes on the outer surface of the foam core material is difficult to achieve the connecting effect; the process difficulty is high because the glue is coated after filling, and the thickness of the glue layer is difficult to control and is easy to be uneven. Regardless of the processing sequence, the heating and pressurizing are difficult to realize during the curing of the glue layer due to the sensitivity of the composite material to the warm environment and the tubular structure, and the glue nodules are easy to generate due to the lack of effective sealing and glue overflow reduction measures, so that the connection strength is reduced. Therefore, it is necessary to develop a new method and apparatus for bonding a composite material round tube to a closed-cell foam core.

Disclosure of Invention

The invention aims to design and develop a glue joint connecting device of a composite material circular tube and a closed-cell foam core material, the closed-cell foam core material is fixed by combining an upper pressure head and a lower pressure head, the glue joint surface pretreatment and glue joint are realized by combining a thicknessing machine and a one-way valve, meanwhile, the damage to the composite material thin-wall tube wall and the complete structure of the foam core material is avoided, and the joint strength is improved.

The invention also designs and develops a glue joint method of the composite material circular tube and the closed-cell foam core material, and the glue injection speed and the glue layer thickness are further controlled by controlling the axial drawing-out speed of the thickness setter, so that the glue layer thickness is more uniform.

The technical scheme provided by the invention is as follows:

a device for adhesively bonding a composite round tube to a closed-cell foam core, comprising:

the thickness fixing device is axially movably arranged in the composite material circular tube, one end of the thickness fixing device is provided with a first through hole, the other end of the thickness fixing device is provided with an opening accommodating cavity communicated with the first through hole, and the outer wall of the thickness fixing device and the inner wall of the opening accommodating cavity are subjected to sand blasting treatment;

wherein the closed cell foam core is disposed in the open receiving cavity;

an upper pressure head, one end of which is movably arranged in the open accommodating cavity and is abutted against one end of the closed-cell foam core material, and the other end of which passes through the first through hole;

the lower pressure head is clamped in the composite circular tube and abuts against the other end of the thicknesser;

and the check valve is arranged at the axis of the lower pressure head and used for injecting glue into the thickness setter.

Preferably, the upper ram includes:

a press block which is of a cylindrical structure and is movably arranged in the open accommodating cavity and is used for matching with the lower press head to limit the movement of the closed-cell foam core material;

the long shaft is coaxially and vertically arranged with the pressing block and can rotatably penetrate through the first through hole.

Preferably, the lower ram further comprises:

the second through hole is arranged at the axle center of the lower pressure head;

the glue guide grooves are radially arranged on the surface of the lower pressure head close to the thickness setter at equal intervals;

wherein, the check valve is in interference fit with the second through hole.

Preferably, the method further comprises the following steps:

a first groove annularly arranged on the circumference of the pressing block;

a first seal ring disposed in the first groove.

Preferably, the method further comprises the following steps:

the second groove is annularly arranged on the circumference of the lower pressure head;

a second seal ring disposed in the second groove.

Preferably, the method further comprises the following steps:

the pressure sensors are uniformly arranged on the surface of the pressing block close to the lower pressing head and used for detecting the change of the radial pressure value borne by the adhesive layer;

and the controller is connected with the pressure sensors, the upper pressure head, the thickness setter and the glue injection equipment and is used for receiving data and transmitting commands.

A glue joint method of a composite material circular tube and a closed-cell foam core material uses a glue joint device of the composite material circular tube and the closed-cell foam core material, and comprises the following steps:

step one, placing the closed-cell foam core material into a containing cavity after low-temperature treatment, clamping the closed-cell foam core material by an upper pressure head and a lower pressure head, and standing;

secondly, after the closed-cell foam core materials are detected by the pressure sensors to extrude the thickness setter, the thickness setter is axially pulled away in the direction away from the closed-cell foam core materials, and glue is injected between the closed-cell foam core materials and the composite circular tube;

and step three, stopping injecting glue when the pressure reaches 2MPa, standing at normal temperature until the glue layer is solidified, and completing glue joint after the upper pressure head and the lower pressure head are reset.

Preferably, the difference between the outer diameter of the thicknesser and the aperture of the opening accommodating cavity is twice the thickness of the glue layer.

Preferably, the glue injection speed satisfies the following conditions:

in the formula, V_iFor speed of injecting glue, omega_iFor correction factor, T is ambient temperature, F_dIs a pressure value, D_bLength of closed cell foam core, p is density of adhesive, V_dThe axial drawing-off speed of the thicknesser.

Preferably, the speed of the axial withdrawing of the thicknesser satisfies the following conditions:

where phi is the correction factor, D_oThe length of the thickness setter is shown as f, the friction force between the thickness setter and the composite circular tube is shown as f, N is the initial volume of the closed-cell foam core material, and R is the diameter of the composite circular tube.

The invention has the following beneficial effects:

(1) the invention discloses a glue joint connecting device of a composite material circular tube and a closed-cell foam core material, which is designed and developed by the invention, the foam core material has a special structure, a higher requirement is put forward on the fullness of a glue layer in order to ensure an enough effective glue joint area, and the glue joint area is well sealed, so that the glue joint part can be eliminated, and the glue layer can be filled in the whole glue joint area under the action of pressure.

(2) The device avoids the damage to the complete structure of the composite material thin-wall pipe and the foam core material, is also suitable for the adhesive bonding of the metal thin-wall pipe and the common solid core material, and has wide application range.

(3) According to the glue joint connecting device for the composite material circular tube and the closed-cell foam core material, which is designed and developed by the invention, the volume of the foam core material is recovered at room temperature, uniform radial pressure can be applied to a glue layer, and meanwhile, the thicknesser polishes the glue joint surface, so that the surface quality of the surface to be glued is improved, the effective gluing area is increased, the generated friction heat accelerates the recovery of the volume of the foam core material, the heating effect is also achieved in the whole curing process, and the heating and pressurizing of the glue layer are effectively realized.

(4) According to the glue joint connecting method for the composite material circular tube and the closed-cell foam core material, which is designed and developed by the invention, the glue injection speed and the glue layer thickness are controlled by controlling the axial drawing-out speed of the thickness setter, so that the glue layer thickness is as uniform as possible, the integration of glue joint surface pretreatment and glue injection equipment is realized, and the glue joint process steps are simplified.

Drawings

Fig. 1 is a schematic cross-sectional structural view of a glue joint device of a composite material circular tube and a closed-cell foam core material.

Fig. 2 is a schematic cross-sectional structural view of the thickness setter of the present invention.

Fig. 3 is a front view structural schematic diagram of the upper pressure head.

Fig. 4 is a schematic structural diagram of the lower pressure head of the present invention.

Fig. 5 is a schematic structural diagram of the gluing connecting device for the composite material circular tube and the closed-cell foam core material, which is provided by the invention, when gluing is completed.

Detailed Description

The present invention is described in further detail below in order to enable those skilled in the art to practice the invention with reference to the description.

As shown in fig. 1, the present invention provides a glue joint device for a composite circular tube and a closed-cell foam core material, which specifically comprises: the composite material circular tube 110, the closed-cell foam core material 120, the upper pressure head 130, the thicknesser 140, the lower pressure head 150, the check valve 160, the first sealing ring 170 and the second sealing ring 180 are coaxially arranged from outside to inside at a part to be glued, wherein the composite material circular tube 110, the thicknesser 140 and the closed-cell foam core material 120 are coaxially arranged from outside to inside.

As shown in fig. 2, the thickness setter 140 is integrally cylindrical and axially movably disposed in the composite circular tube 110, one end of the thickness setter 140 is provided with a first through hole 141, the other end is provided with an open accommodating cavity 142 communicating with the first through hole 141, and the closed-cell foam core 120 is disposed in the open accommodating cavity 142.

The inner wall of the opening accommodating cavity 142 and the outer wall of the thicknesser 140 are subjected to corresponding sand blasting treatment to obtain a sand streak effect with certain roughness, and the specific roughness is determined according to a specific implementation process and a cementing material.

One end of the upper ram 130 is movably disposed in the open receiving cavity 142 against one end of the closed cell foam core 120, and the other end passes through the first through hole 141; the lower pressure head 150 is clamped in the composite material circular tube 110 and abuts against the other end of the thicknesser 140, and the upper pressure head 130 and the lower pressure head 150 relatively press and limit the degree of freedom of the closed-cell foam core material 120; the check valve 160 is disposed at the axial center of the lower ram 150, and is used for injecting glue into the thickness setter 140.

In this embodiment, the check valve 160 is a straight-through cartridge check valve, which ensures that the adhesive can only be injected into the bonding area and cannot flow back.

The overall height of the thickness fixer 140 is 35-50mm higher than that of the closed-cell foam core material 120, the outer diameter of the thickness fixer 140 is the same as the inner diameter of the composite circular tube 110, the aperture of the first through hole 141 is 11mm and the height is 25-40mm, and the difference between the outer diameter of the thickness fixer 140 and the aperture of the opening accommodating cavity 142 is theoretically twice of the expected adhesive layer thickness (if the adhesive layer thickness is 2mm, the inner diameter of the composite circular tube 110 is 40mm, the aperture of the opening accommodating cavity 142 is 36 mm).

As shown in fig. 3, the upper ram 130 includes: a press block 131 and a long shaft 132, the press block 131 being of a cylindrical configuration and movably disposed in the open receiving cavity 142 for cooperating with the lower ram 150 to limit movement of the closed cell foam core 120; the long shaft 132 is coaxially and vertically disposed with the pressing block 131, and the long shaft 132 coaxially and rotatably passes through the first through hole 141.

The axial diameter of major axis 132 is 10mm, and the height of briquetting 131 is 10mm, and the external diameter of briquetting 131 is the same with the aperture that the opening held the chamber 142, and first recess 133 is turned into on the lateral surface circumference of briquetting 131 first sealing washer 170 is installed in the first recess 133, and the degree of depth of first recess 133 is 4mm, and the width is 6mm and briquetting 131 evenly is provided with a plurality of pressure sensor 134 on being close to the lateral surface of obturator foam core material 120 for detect the radial pressure value change that the glue film receives, thereby make the controller judge whether the glue film is sufficient and pressurized.

As shown in fig. 4, the whole lower pressure head 150 is of a cylindrical structure, the outer diameter of the lower pressure head is the same as the inner diameter of the composite circular tube 110, the height of the lower pressure head is 10mm, the middle of the lower pressure head is provided with a second through hole 152, the second through hole 152 is a stepped hole, the diameter of a large hole is 5mm, the height of the second through hole is 7mm, the diameter of a small hole is 2mm, the height of the small hole is 2mm, the large hole is provided with the check valve 160, the check valve 160 is in interference fit with the large hole, a plurality of glue guide grooves 153 are radially processed on the end face, in contact with the closed-hole foam core material 120, of the lower pressure head 150, the glue guide grooves 153 are semicircular straight grooves, the section radius of the cross section is 1mm, a second groove 151 is lathed on the circumference of the outer side surface of the lower pressure head 150, a second sealing ring 180 is installed in the second groove 151, the depth of the second groove 151 is 5mm, and the width is 6 mm.

In this embodiment, the first seal ring 170 and the second seal ring 180 are both common O-ring seals.

In this embodiment, the surfaces of the upper pressing head 130 and the lower pressing head 150 are both sprayed with anti-sticking wear-resistant coatings, so that the closed-cell foam core material 120 can be easily peeled off from both sides after the adhesive bonding is completed and returns to the original position; the first seal ring 170 and the second seal ring 180 are sized to ensure sealing ability during the entire bonding process, and are made of a material that is not easily adhered by an adhesive.

The invention also comprises: and a controller (not shown) connected to the pressure sensors 134, the upper ram 130, the thickness setter 140 and the glue injection device, for receiving the data detected by the pressure sensors 134 and controlling the states of the upper ram 130 and the thickness setter 140 and the glue injection speed.

The glue joint connecting device for the composite material circular tube and the closed-cell foam core material, which is designed and developed by the invention, realizes the integration of glue joint surface pretreatment and glue injection equipment, and simplifies the glue joint process steps; the volume of the foam core material is recovered at room temperature, uniform radial pressure can be applied to the adhesive layer, and meanwhile, the thicknesser polishes the glued joint surface to generate friction heat, so that the recovery of the volume of the foam core material is accelerated, the whole curing process is heated, and the heating and the pressurization of the adhesive layer are effectively realized; the foam core material has a special structure, and provides higher requirements for the fullness of the adhesive layer in order to ensure enough effective adhesive bonding area, and the good sealing of the adhesive bonding area can not only eliminate the generation of adhesive nodules at the adhesive bonding part, but also enable the adhesive layer to be filled in the whole adhesive bonding area under the action of pressure.

The invention relates to a glue joint method of a composite material circular tube and a closed-cell foam core material, which uses a glue joint device of the composite material circular tube and the closed-cell foam core material, and comprises the following steps:

the method comprises the following steps: placing the closed-cell foam core material at a low temperature in advance to enable the volume of the closed-cell foam core material to shrink, taking out the closed-cell foam core material, placing the closed-cell foam core material into an opening accommodating cavity in a thicknessing machine, and clamping the closed-cell foam core material by an upper pressure head and a lower pressure head to limit all degrees of freedom of the end surface of the closed-cell foam core material;

step two: standing for a period of time, enabling the foam core material to be closed to recover in volume along with the temperature rise, generating a certain extrusion effect on the inner wall of the thickness setter, controlling the thickness setter to rotate and axially draw away in the direction away from the foam core material to be closed through a controller, and injecting glue from the one-way valve to the area to be glued; in the process, the inner wall of the composite material circular pipe and the outer wall of the closed-cell foam core material are polished by sand grains on the surfaces of the outer wall of the thickness setter and the inner wall of the opening accommodating cavity, the upper pressure head and the lower pressure head keep a clamping state, and the closed-cell foam core material is prevented from moving along with the thickness setter;

wherein, the speed of injecting glue satisfies:

in the formula, V_iFor speed of injecting glue, omega_iThe value range of the correction coefficient is [0.5-0.78 ] for the correction coefficient]T is the ambient temperature, F_dIs a pressure value, D_bLength of closed cell foam core, p is density of adhesive, V_dThe axial drawing-off speed of the thicknessing machine;

the axial drawing-off speed of the thicknessing machine meets the following requirements:

wherein phi is a correction factor, and the value range of the correction factor is [1.1-1.43 ]]，D_oThe length of the thickness setter, f the friction force between the thickness setter and the composite circular tube, N the initial volume of the closed-cell foam core material, and R the diameter of the composite circular tube;

step three: as shown in fig. 5, the adhesive is continuously filled in the gap between the pipe wall of the composite material circular pipe and the closed-cell foam core material and is blocked by the first sealing ring and the second sealing ring to overflow, when the pressure sensor detects that the pressure value reaches 2MPa, the glue injection is stopped, the pressure sensor stands at normal temperature until the glue layer 190 is cured, the upper pressure head and the lower pressure head return to the original positions, and the glue joint is completed.

At normal temperature, the diameter of the closed-cell foam core material is not larger than the inner diameter of the composite circular tube; the difference value between the outer diameter of the thickness setter and the aperture of the opening accommodating cavity is theoretically twice of the thickness of the final glue layer, and the thickness of the glue layer is generally 0.1-2 mm.

The invention relates to a glue joint connection method of a composite material circular tube and a closed-cell foam core material, which is designed and developed by the invention, the thickness of a glue layer is controlled by a thicknesser, the thickness of the glue layer is as uniform as possible, the composite material belongs to a brittle material, and the hole structure of the foam core material is easy to locally collapse to generate cracks.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.