阅读说明：本技术 一种热塑复合材料蒙皮桁条结构双线圈感应焊接的装置及方法 (Device and method for induction welding of double coils of thermoplastic composite material skin stringer structure ) 是由 占小红 罗杰帮 王飞云 卜珩倡 马婉萍 王磊磊 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种热塑复合材料蒙皮桁条结构双线圈感应焊接的装置及方法。本装置包括感应焊机、计算机控制系统、冷却装置、双线圈感应焊接装置,其中感应焊机用于对焊接过程的参数控制；计算机控制系统根据激光测距仪反馈的数据对两线圈之间的宽度进行调节；冷却装置用于对线圈进行冷却；双线圈感应焊接装置用于焊接热塑复合材料蒙皮桁条结构。该装置可适应不同桁条宽度的蒙皮桁条结构感应焊接,并且可实现桁条两侧的同步加压及焊接。本发明的优点在于能够有效地减小蒙皮桁条结构的焊后变形以及焊后应力,相比于现有技术,焊接成形质量以及效率均更佳。(The invention discloses a device and a method for double-coil induction welding of a skin-stringer structure made of thermoplastic composite materials. The device comprises an induction welding machine, a computer control system, a cooling device and a double-coil induction welding device, wherein the induction welding machine is used for controlling parameters of a welding process; the computer control system adjusts the width between the two coils according to the data fed back by the laser range finder; the cooling device is used for cooling the coil; the double-coil induction welding device is used for welding the thermoplastic composite material skin-stringer structure. The device can adapt to the induction welding of skin stringer structures with different stringer widths, and can realize the synchronous pressurization and welding of two sides of the stringer. The invention has the advantages that the post-welding deformation and the post-welding stress of the skin-stringer structure can be effectively reduced, and compared with the prior art, the welding forming quality and efficiency are better.)

1. The utility model provides a device of thermoplastic composite material covering stringer structure twin coil induction welding which characterized in that: the welding device comprises an induction welding machine (1), a computer control system (2), a cooling device (3) and a double-coil induction device:

two liang adopt the wire to connect twin coil induction system, computer control system (2) and induction welder (1), and twin coil induction system adopts cooling water pipe (9) to be connected with cooling device (3):

the upper end of the double-coil induction device is connected with a robot through a robot connector (4), so that the movement of a welding head in different directions is realized; the double-coil induction device is of a symmetrical structure, guide rails and sliding blocks (6) are arranged on two sides of the double-coil induction device, and the sliding blocks are connected with compression rollers (8) and disc coils (10); hollowing out the upper part of the slide rail, and connecting the slide block (6) and the cooling device (3) through a cooling water pipe (9) passing through the hollow-out area; a sliding rail motor (13) is arranged in the middle of the double-coil induction device frame (5) and is respectively connected with the two sliding blocks (6) through a conducting wire, a laser range finder (7) is arranged in the middle of the lower part of the double-coil induction device frame (5), and the laser range finder (7) is connected with the computer control system (2); the compression roller (8) is positioned in front of the disc coil (10), and the disc coil (10) is connected with the cooling water pipe (9) in the guide rail sliding block (6).

2. The apparatus for double coil induction welding of a thermoplastic composite skin-stringer structure according to claim 1, wherein: the movable distance range of the sliding block (6) is 0-80 mm; the material of the press roll (8) is ceramic material; the disk coil (10) is 10mm higher than the press roll (8) in the horizontal direction.

3. A method of double coil induction welding of a skin-stringer configuration of thermoplastic composite material using the apparatus of claim 1, wherein: clamping and fixing the skin-stringer structure on a tooling platform, and moving the double-coil induction device to the upper part of the structure; the laser range finder (7) measures the width of the stringer (11), and feeds back the measurement result to the computer control system (2) in real time; the computer control system (2) controls the slide rail motor (13) to operate, the slide rail motor (13) drives the two slide blocks (6) to move respectively, and the moving distance of each slide block (6) is half of the width of the stringer (11); after the sliding block (6) stops moving, moving the double-coil induction device to the skin-stringer structure initial welding position, and turning on a power supply of the induction welding machine (1) and the cooling device (3) for welding; in the welding process, the compression roller (8) is used for pressing the skin stringer structure, under the pressure of the compression roller (8), the two disc coils (10) are used for simultaneously welding the two sides of the stringer structure (11), and the skin stringer is efficiently connected under the action of pressure and heat.

4. The method for double coil induction welding of the thermoplastic composite skin-stringer structure according to claim 3, wherein: the two sliding blocks (6) move symmetrically in opposite directions; the working frequency of the induction welder (1) is 200 kHz.

The field is as follows:

the invention relates to a device and a method for double-coil induction welding of a thermoplastic composite material skin stringer structure, belongs to the field of composite material induction welding, and is particularly applied to the field of induction welding of the thermoplastic composite material skin stringer structure.

Background art:

the field of aviation has paid more and more attention to the lightweight of aircraft structures, and composite materials have become one of the important materials for aircraft structure manufacturing, wherein thermoplastic composite materials have gradually received much attention due to their advantages of better toughness, weldability, repairability, recyclability, shorter processing time, and the like. The skin-stringer structure is quite common in the manufacturing process of important equipment such as aerospace and the like, and for the connection of the skin-stringer structure, the conventional method comprises gluing and mechanical connection, but both the two methods have inevitable defects, so that the connection efficiency and quality of the skin-stringer structure cannot be further broken through.

Compared with the adhesive bonding technology and the mechanical connection technology, the induction welding has the advantages of non-contact, no damage to a material matrix, high efficiency and the like, and has attracted wide attention of technical personnel. Induction welding is the process of producing a high-frequency magnetic field to induce heat in a material matrix placed in the magnetic field, so that the resin between connecting layers is melted and then the materials are connected through cooling solidification. However, both sides of the stringer need to be connected in the thermoplastic composite material skin stringer structure, and the problems of large structural deformation, large post-welding stress and the like are inevitable when the stringer is connected in a single-side induction sequence. In order to solve the problems, the invention provides a device and a method for double-coil induction welding of a skin-stringer structure made of thermoplastic composite materials.

The invention content is as follows:

the invention provides a device and a method for double-coil induction welding of a skin-stringer structure made of a thermoplastic composite material, aiming at solving the problems of large structural deformation, large post-welding stress and the like of the skin-stringer structure welded by the existing induction welding technology. The device uses the twin coil to carry out the while welding to stringer structure both sides, and uses the compression roller to exert pressure to covering stringer structure, has not only solved the deformation stress big scheduling problem of welding this structure, still makes welding process more high-efficient. Meanwhile, the device can adapt to welding of structures with different stringer widths by combining the use of a laser range finder.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a device of thermoplastic composite material covering stringer structure twin coil induction welding which characterized in that: the welding device comprises an induction welding machine (1), a computer control system (2), a cooling device (3) and a double-coil induction device:

two liang adopt the wire to connect twin coil induction system, computer control system (2) and induction welding machine (1), and twin coil induction welding set adopts cooling water pipe (9) to be connected with cooling device (3):

the upper end of the double-coil induction device is connected with a robot through a robot connector (4), so that the movement of a welding head in different directions is realized; the double-coil induction device is of a symmetrical structure, guide rails and sliding blocks (6) are arranged on two sides of the double-coil induction device, and the sliding blocks are connected with the compression roller (8) and the disc coil (10); hollowing out the upper part of the slide rail, and connecting the slide block (6) and the cooling device (3) through a cooling water pipe (9) passing through the hollow-out area; a sliding rail motor (13) is arranged in the middle of the double-coil induction device frame (5) and is respectively connected with the two sliding blocks (6) through a conducting wire, a laser range finder (7) is arranged in the middle of the lower part of the double-coil induction device frame (5), and the laser range finder (7) is connected with the computer control system (2); the compression roller (8) is positioned in front of the disc coil (10), and the disc coil (10) is connected with the cooling water pipe (9) in the guide rail sliding block (6).

Wherein the movable distance range of the guide rail sliding block (6) is 0-80 mm; the material of the press roll (8) is ceramic material; the disk coil (10) is 10mm higher than the press roll (8) in the horizontal direction.

A method for induction welding of double coils of a thermoplastic composite material skin stringer structure is characterized in that: clamping and fixing the skin-stringer structure on a tooling platform, and moving the double-coil induction device to the upper part of the structure; the laser range finder (7) measures the width of the stringer (11), and feeds back the measurement result to the computer control system (2) in real time; the computer control system (2) controls the slide rail motor (13) to operate, the slide rail motor (13) drives the two slide blocks (6) to move respectively, and the moving distance of each slide block (6) is half of the width of the stringer (11); after the sliding block (6) stops moving, moving the double-coil induction device to the skin-stringer structure initial welding position, and turning on a power supply of the induction welding machine (1) and the cooling device (3) for welding; in the welding process, the compression roller (8) is used for pressing the skin stringer structure, under the pressure of the compression roller (8), the two disc coils (10) are used for simultaneously welding the two sides of the stringer structure (11), and the skin stringer is efficiently connected under the action of pressure and heat.

The two guide rail sliding blocks (6) move symmetrically in opposite directions; the working frequency of the induction welder (1) is 200 kHz.

Compared with the prior art, the invention at least has the following advantages and effects:

1) the synchronous induction welding of two sides of the thermoplastic composite material skin stringer structure can be realized, and the method is more efficient compared with single-side induction welding;

2) the deformation and the stress after welding of the skin-stringer structure can be effectively reduced, and compared with the one-side induction welding, the forming quality after welding is higher;

3) can adapt to the induction welding of different stringer widths.

Description of the drawings:

fig. 1 is a schematic working diagram of a device and a method for double-coil induction welding of a skin-stringer structure made of thermoplastic composite materials.

In the figure: 1. the device comprises an induction welding machine, 2 a computer control system, 3 a cooling device, 4 a robot connector, 5 a double-coil device frame, 6 a sliding block, 7 a laser range finder, 8 a compression roller, 9 a cooling water pipe, 10a disc type coil, 11 a thermoplastic composite material stringer structure, 12 a thermoplastic composite material skin structure.

Fig. 2 is a rear view of the dual induction coil apparatus.

In the figure: 13. a slide rail motor.

The specific implementation mode is as follows:

the present invention is described in further detail below with reference to specific embodiments for the convenience of understanding by those skilled in the art.

As shown in figure 1, the invention discloses a device for double-coil induction welding of a thermoplastic composite skin-stringer structure, which comprises an induction welding machine (1), a computer control system (2), a cooling device (3) and a double-coil induction device; the double-coil induction device, the computer control system (2) and the induction welding machine (1) are connected in pairs by leads, and the double-coil induction welding device is connected with the cooling device (3) by a cooling water pipe (9); the upper end of the double-coil induction device is connected with a robot through a robot connector (4), so that the movement of a welding head in different directions is realized; the double-coil induction device is of a symmetrical structure, guide rails and sliding blocks (6) are arranged on two sides of the double-coil induction device, and the sliding blocks are connected with the compression roller (8) and the disc coil (10); hollowing out the upper part of the slide rail, and connecting the slide block (6) and the cooling device (3) through a cooling water pipe (9) passing through the hollow-out area; a sliding rail motor (13) is arranged in the middle of the double-coil induction device frame (5) and is respectively connected with the two sliding blocks (6) through a conducting wire, a laser range finder (7) is arranged in the middle of the lower part of the double-coil induction device frame (5), and the laser range finder (7) is connected with the computer control system (2); the compression roller (8) is positioned in front of the disc coil (10), and the disc coil (10) is connected with the cooling water pipe (9) in the guide rail sliding block (6).

A method for induction welding a thermoplastic composite skin-stringer structure, obtainable by the steps of:

the method comprises the following steps: firstly, clamping a carbon fiber reinforced PEEK resin-based composite material skin stringer structure on a workbench, wherein the welding structure is a cap-shaped skin stringer structure, the skin size is 80mm multiplied by 100mm multiplied by 2mm, the width of a stringer cap is 20mm, the welding width of two sides is 20mm, and a robot controls a double-coil device to move above the skin stringer structure;

step two: starting the laser range finder (7), automatically measuring the width of the stringer (11) to be 20mm by the laser range finder (7), and then feeding back the measurement result to the computer control system (2) in real time;

step three: the computer control system (2) calculates the moving distance of each sliding block (6) and controls the sliding rail motor (13) to operate, the sliding rail motor (13) drives the two sliding blocks (6) to move towards the two ends respectively, and the moving distance of each sliding block (6) is 10 mm;

step four: and after the sliding block (6) stops moving, moving the double-coil induction device to the skin-stringer structure initial welding position, and turning on the power supply of the induction welding machine (1) and the cooling device (3). Setting the frequency of an induction coil to be 200kHz, the input current to be 10A and the temperature of a cooling water tank to be 25 ℃;

step five: according to the skin-stringer structure, a robot sets a welding starting point and a welding end point, a welding path is a straight line, and a welding distance is 100 mm;

step six: during the welding process; pressing the composite material skin stringer structure by a compression roller (8), and respectively welding two sides of the stringer structure (11) by two induction coils (10) simultaneously under the pressure of the compression roller (8);

step seven: after welding, the double-coil induction device is moved to a safe position, and the induction welding machine and the power supply of the cooling device are turned off.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.