Detachable connecting structure and connecting method for metal and thermoplastic composite material

Abstract

The invention relates to the technical field of dissimilar material connecting structures, and discloses a metal and thermoplastic composite material detachable connecting structure and a connecting method.The metal and thermoplastic composite material detachable connecting structure comprises a metal plate and a thermoplastic composite material plate, and a connecting groove is formed in the metal plate; a connecting joint is formed on the end face, facing the metal plate, of the thermoplastic composite material plate, the connecting joint is formed in the connecting groove, and the connecting joint and the connecting groove can be detached; the connecting joint comprises a connecting face and a tip end which are located at the two ends of the connecting joint respectively, the connecting face is oval, the connecting joint comprises an outer arc line and an inner arc line in the section defined by the long axis of the connecting joint and the tip end, the outer arc line hunches towards the direction away from the inner arc line, and the inner arc line hunches towards the direction of the outer arc line. Through the arrangement of the connecting joints and the connecting grooves, the connecting strength of the thermoplastic composite material plate and the metal plate can be improved in multiple directions, and meanwhile, the metal plate and the thermoplastic composite material plate can be disassembled through the acting force in the outer arc direction of the connecting joints.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dissimilar material connection structure, and particularly relates to a metal and thermoplastic composite material detachable connection structure and a connection method. BACKGROUND

[0002] Thermoplastic carbon fiber composite materials have been widely used in the fields of automobiles, aerospace, etc. due to their light weight, high strength, corrosion resistance, recyclability and other characteristics.

[0003] At present, thermoplastic composite materials and metals are usually connected by melting the resin and forming texture (such as grooving, micro-pitting, roughening treatment, etc.) on the surface of the metal to enhance the bonding strength of the resin and the metal interface. Such a structure indeed has strong connection performance in the main stress direction, but it usually has obvious directionality, that is, the connection strength is high under the load consistent with the texture direction, while the connection strength is significantly reduced under other directions (lateral, shear stress, cross tensile, etc.), which is difficult to meet the mechanical requirements in multiple directions. At the same time, with the continuous improvement of green sustainability and recycling in the fields of new energy vehicles, aerospace, etc., and the increasing demand for recycling of thermoplastic composite materials (such as thermoplastic carbon fiber composite materials) in waste or maintenance components, most of the connection methods in the prior art can improve the strength, but it is difficult to realize non-destructive disassembly or detachability, thereby limiting the true recycling potential of thermoplastic composite materials. Therefore, a connection structure that can significantly improve the connection strength with metal in multiple directions and facilitate disassembly, maintenance or recycling when necessary is needed. SUMMARY

[0004] The present application provides a metal and thermoplastic composite material detachable connection structure and a connection method for improving the connection strength of thermoplastic composite materials and metals in multiple directions, and facilitating the disassembly and recycling of metals and thermoplastic composite materials after product scrapping.

[0005] In order to achieve the above-mentioned purpose, the main technical solution adopted by the present application includes: In one aspect, the present application provides a detachable connection structure of metal and thermoplastic composite material, comprising a metal plate and a thermoplastic composite plate, a connecting groove is formed in the metal plate; a connecting joint is formed on the end face of the thermoplastic composite plate facing the metal plate, the connecting joint is formed in the connecting groove, and the connecting joint and the connecting groove can be detached; wherein the direction perpendicular to the metal plate is defined as the first direction; along the first direction, the connecting joint comprises a connecting surface and a sharp end located at both ends of the connecting joint respectively, the connecting joint is connected with the thermoplastic composite plate through the connecting surface, and the connecting surface is in an elliptical shape; in the cross section formed by the long axis of the connecting joint and the sharp end, the connecting joint further comprises an outer arc line and an inner arc line, the outer arc line is arched in a direction away from the inner arc line, and the inner arc line is arched in a direction towards the outer arc line; along the cross section in the direction perpendicular to the tangent of the outer arc line, the cross-sectional area of the connecting joint decreases from the connecting surface to the sharp end; and the shape of the connecting joint is consistent with the shape of the connecting groove.

[0006] Further, the arc expression of the outer arc line is ; wherein x1 is the coordinate of the point on the outer arc line in the direction of the long axis of the connecting joint; y1 is the coordinate of the point on the outer arc line in the first direction; is the angle between the connecting line of the point on the outer arc line and the end point of the long axis of the connecting joint towards the outer arc line and the long axis of the connecting joint.

[0007] Further, the arc expression of the inner arc line is wherein x2 is the coordinate of the point on the inner arc line in the direction of the long axis of the connecting joint; y2 is the coordinate of the point on the inner arc line in the first direction.

[0008] Further, the tangent of the outer arc line at the position of the sharp end is parallel to the long axis of the connecting joint.

[0009] Further, the projection of the sharp end in the first direction is located at the end point of the long axis of the connecting surface.

[0010] Further, the ratio of the long axis to the short axis of the connecting surface ranges from 1.5:1 to 2.5:1.

[0011] Further, the connecting joint is symmetrical about the cross section formed by the long axis of the connecting joint and the sharp end.

[0012] In another aspect, the present application also provides a connecting method of a detachable connection structure of metal and thermoplastic composite material, comprising the following steps, Step S1, machining a connecting groove on the end face of the metal plate; Step S2, using thermoplastic resin as the matrix to make the thermoplastic composite plate; Step S3, welding is performed by an ultrasonic welding device to melt the thermoplastic composite material plate at the connection interface towards the resin at the connection groove, and under the action of ultrasonic pressure, flow into the connection groove; Step S4, waiting for the molten thermoplastic resin flowing into the connection groove to form a connection joint, so that the connection joint is mechanically locked with the connection groove.

[0013] Further, in step S1, the connection groove is divided into a plurality of processing layers, and the processing layer is perpendicular to the tangent of the outer arc line at the position of the processing layer; And the processing layer is ablated layer by layer by a femtosecond laser device.

[0014] Further, step S3 further comprises the following steps, Step S3.1, the resin at the connection groove area of the thermoplastic composite material plate is melted by the first pulse; Step S3.2, the melted resin is driven to flow by the second pulse, and penetrates into the connection groove.

[0015] Through the above arrangement of the connection joint and the connection groove, the connection strength of the thermoplastic composite material plate and the metal plate can be improved in multiple directions, and at the same time, the metal plate and the thermoplastic composite material plate can be disassembled by the force along the outer arc line direction of the connection joint, thereby improving the material utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0017] Figure 1 is a schematic diagram of the detachable connection structure of the metal and the thermoplastic composite material provided by the present application.

[0018] Figure 2 is Figure 1 is a schematic diagram of the thermoplastic composite material plate of the detachable connection structure of the metal and the thermoplastic composite material shown in the figure.

[0019] Figure 3 is Figure 1 is a schematic diagram of the metal plate of the detachable connection structure of the metal and the thermoplastic composite material shown in the figure.

[0020] Figure 4 is Figure 1 is a schematic diagram of the detachable connection structure of the metal and the thermoplastic composite material shown in the figure.

[0021] Fig. 1 is a schematic view of a metal plate 1 and a thermoplastic composite plate 2 connected by a detachable connection structure according to an embodiment of the present application. Fig. 2 is a schematic view of the metal plate 1 and the thermoplastic composite plate 2 connected by the detachable connection structure according to the embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0023] As shown in Figure 1 and Figure 2 , as an implementation manner, the present application provides a detachable connection structure of a metal plate 1 and a thermoplastic composite plate 2, the detachable connection structure is used to realize detachable connection of the metal plate 1 and the thermoplastic composite plate 2, and ensure the connection strength of the metal plate 1 and the thermoplastic composite plate 2 in each direction under the connection state.

[0024] The metal plate 1 is formed with a connection groove 101, and the connection groove 101 extends into the metal plate 1.

[0025] The thermoplastic composite plate 2 is formed with a connection joint 201 on an end face facing the metal plate 1, the connection joint 201 extends towards the metal plate 1, and the connection joint 201 is formed in the connection groove 101.

[0026] Meanwhile, the connection joint 201 and the connection groove 101 can be detached, so as to detach the metal plate 1 and the thermoplastic composite plate 2, thereby facilitating the reuse of the metal plate 1 and / or the thermoplastic composite plate 2, and improving the material utilization rate.

[0027] A first direction perpendicular to the metal plate 1 is defined; along the first direction, the connection joint 201 includes a connecting face 202 and a pointed end 203 located at two ends of the connection joint 201 respectively, the connection joint 201 is connected with the thermoplastic composite plate 2 through the connecting face 202, and a main body structure between the connecting face 202 and the pointed end 203 of the connection joint 201 is inserted into the connection groove 101, so that the metal plate 1 and the thermoplastic composite plate 2 are connected.

[0028] The connecting face 202 is in an elliptical shape, and the elliptical connecting face 202 includes a major axis and a minor axis.

[0029] In order to more clearly describe the technical solutions of the present application, the following definitions are made: Figure 2The upper, lower, left, right, front, and rear directions shown. Among them, the first direction refers to the height direction of the connecting joint 201, that is Figure 2 the upper and lower directions in Figure 2 . The second direction refers to the long axis direction of the connecting surface 202, that is Figure 2 the left and right directions in . The third direction refers to the short axis direction of the connecting surface 202, that is

[0030] the front and rear directions in .

[0031] In the cross section 3 enclosed by the long axis of the connecting joint 201 and the tip 203, that is, in the cross section 3 enclosed by the upper and lower and left and right, the connecting joint 201 also includes an outer arc line 204 and an inner arc line 205.

[0032] Among them, the outer arc line 204 is arched towards the direction away from the inner arc line 205, and the inner arc line 205 is arched towards the direction of the outer arc line 204, that is, the outer arc line 204 and the inner arc line 205 are curved towards the same direction, and the cross section of the connecting joint 201 perpendicular to the tangent direction of the outer arc line 204 The cross-sectional area decreases from the connecting surface 202 to the tip 203, and the connecting joint 201 with a cross-sectional area that decreases smoothly from the connecting surface 202 to the tip 203 facilitates the disassembly of the metal plate 1 and the thermoplastic composite plate 2.

[0033] At the same time, the connecting joint 201 as a whole presents a curved sharp structure, so that when the connecting joint 201 is separated from the metal plate 1, the separation force acting on the connecting joint 201 needs to be adjusted in direction with the separation progress of the connecting joint 201 from the metal plate 1. Overall, the separation force acting on the connecting joint 201 changes in the tangent direction of the outer arc line 204.

[0034] The shape of the connecting joint 201 is consistent with the shape of the connecting groove 101, so as to facilitate the connection and fixation of the metal plate 1 and the thermoplastic composite plate 2. ; Among them, x1 is the coordinate of the point on the outer arc line 204 in the long axis direction of the connecting joint 201; y1 is the coordinate of the point on the outer arc line 204 in the first direction; is the angle between the line connecting the point on the outer arc line 204 and the end point of the long axis of the connecting joint 201 towards the outer arc line 204 and the long axis of the connecting joint 201.

[0035] By setting the outer arc 204 as a circular arc, the connection surface between the connecting joint 201 and the connecting groove 101 becomes smoother. This allows the connecting joint 201 to gradually slide out of the connecting groove 101 along the contour of the outer arc 204 when separating the metal plate 1 and the thermoplastic composite plate 2. This prevents pressure concentration in some areas during the separation of the connecting joint 201 and the connecting groove 101, reduces the risk of damage to the metal plate 1 and the thermoplastic composite plate 2, and achieves non-destructive separation. At the same time, it improves the ease of separating the metal plate 1 and the thermoplastic composite plate 2.

[0036] and, The angle range is 45° to 60°. Specifically, The angle range is 50° to 55°. More specifically, The angle is 52.5°.

[0037] By setting the above, avoid The angle is too small, which causes the length of the connecting joint 201 along the long axis to be too large and the height of the connecting joint 201 along the first direction to be too small. This avoids the bending angle of the connecting joint 201 being too large, improves the ease of separation between the connecting joint 201 and the connecting groove 101, and facilitates the separation of the metal plate 1 and the thermoplastic composite plate 2.

[0038] By setting the above, avoid If the angle is too large, the length of the connecting joint 201 along the long axis will be too small, and the height of the connecting joint 201 along the first direction will be too large. This will prevent the bending angle of the connecting joint 201 from being too small, improve the connection strength between the connecting joint 201 and the connecting groove 101, and thus improve the connection strength between the metal plate 1 and the thermoplastic composite plate 2.

[0039] As one implementation, the radius of the outer arc 204 is 0.6 mm, and the outer arc 204, the inner arc 205 and the tip 203 are located in the same plane to provide a smooth splitting path.

[0040] As one implementation method, the arc expression of the inner arc is: Where x2 is the coordinate of the point on the inner arc located in the major axis direction of the connecting joint 201; y2 is the coordinate of a point on the inner arc located in the first direction; α and β are both parameters of the inner arc 205.

[0041] By setting the inner arc line 205 as a hyperbolic shape, the connecting joint 201 is expanded from the top end to the bottom, so that the thickness and curvature of the connecting joint 201 in the upper and lower cross sections and the left and right cross sections are changed in a gradient, the stress distribution on the surface of the connecting joint 201 after the connecting joint 201 is connected with the connecting groove 101 is optimized, the fatigue performance is improved, the edge stress concentration is reduced, and the connection stability of the connecting joint 201 and the connecting groove 101 is improved.

[0042] Wherein, the values of α, β are in linear proportional relationship with the thickness t of the metal plate 1. By controlling the proportional relationship between the values of α, β and the thickness t of the metal plate 1, the stress distribution of the inner wall of the connecting groove 101 is optimized, and the reliable manufacturability of the laser melting processing of the connecting groove 101 and the filling of the thermoplastic resin into the connecting groove by heat melting is ensured.

[0043] Specifically, α = 0.35 t, β = 0.20 t, more specifically, in the present implementation, α is 0.7 and β is 0.4.

[0044] Through the above setting, the wall thickness gradient between the inner arc line 205 and the outer arc line 204 can be better controlled, the connection stability of the connecting joint 201 and the connecting groove 101 is improved, and the connecting joint 201 and the connecting groove 101 can be easily separated by applying a force changing in the tangential direction of the outer arc line 204.

[0045] As an implementation mode, the tangent line at the position of the tip 203 of the outer arc line 204 is parallel to the long axis of the connecting joint 201, that is, the tangent line at the position of the tip 203 of the outer arc line 204 is horizontal. The tangent line at the position of the tip 203 of the outer arc line 204 is horizontal, which is beneficial to the initial position of disassembly, and the connecting joint 201 and the connecting groove 101 are separated by applying a horizontal force, which reduces the disassembly resistance and improves the disassembly convenience.

[0046] As an implementation mode, the projection of the tip 203 in the first direction is located in the connecting surface 202, so that the connecting joint 201 has different tangent lines in different directions connected with the connecting groove 101, so that the connecting joint 201 and the connecting groove 101 are engaged in different directions, thereby preventing the connecting joint 201 from being separated from the connecting groove 101 under the action of one orientation, thereby improving the connection stability of the connecting joint 201 and the connecting groove 101.

[0047] As an implementation mode, the ratio of the long axis to the short axis of the connecting surface 202 ranges from 1.5:1 to 2.5:1. Specifically, the ratio of the long axis to the short axis of the connecting surface 202 ranges from 1.8:1 to 2.2:1. More specifically, the ratio of the long axis to the short axis of the connecting surface 202 is 2:1.

[0048] Along the long axis direction of the connecting surface 202, the contact area of the connecting joint 201 and the connecting groove 101 is increased, the shear bearing in the long axis direction is improved, along the short axis direction of the connecting surface 202, the lateral pull-out of the connecting joint 201 from the connecting groove 101 is limited, the pull-out resistance is enhanced, at the same time, the material of the connecting joint 201 can be reduced, and the manufacturing cost of the connecting joint 201 is reduced.

[0049] Specifically, the long axis length of the connecting surface 202 is 0.8mm, and the short axis length of the connecting surface 202 is 0.4mm.

[0050] Through the above setting, the size of the connecting joint 201 can be reduced to reduce the manufacturing cost of the connecting joint 201.

[0051] Through the above setting, the size of the connecting joint 201 can be reduced to reduce the manufacturing cost of the connecting joint 201.

[0052] As an implementation manner, the connecting joint 201 is symmetrical about the cross section 3 formed by the long axis of the connecting joint 201 and the tip 203, which improves the manufacturing convenience of the connecting joint 201, and makes the force in each direction of the connecting joint 201 symmetrical, so as to ensure that the connecting joint 201 has more reliable mechanical properties. At the same time, only the dismounting force needs to be ensured in the cross section formed by the long axis of the connecting joint 201 and the tip 203 during dismounting, which improves the separation convenience of the connecting joint 201 and the connecting groove 101.

[0053] It should be noted that a plurality of connecting joints 201 are formed on the thermoplastic composite material plate 2, and the long axes of the connecting surfaces 202 of each connecting joint 201 are parallel to each other, and the directions of the tips 203 are consistent.

[0054] Through the above structure of the connecting joint 201, when a plurality of connecting joints 201 are formed on the thermoplastic composite material plate 2, the directions of the forces required for separating each connecting joint 201 from the connecting groove 101 are different, thereby improving the connecting strength of the metal plate 1 and the thermoplastic composite material plate 2.

[0055] As an implementation manner, the application provides a connecting method of a metal and thermoplastic composite material detachable connecting structure, comprising the following steps, Step S1, machining the connecting groove 101 on the end surface of the metal plate 1.

[0056] As Figure 3As shown, when processing the connecting groove 101, the connecting groove 101 is divided into a plurality of processing layers 102, the thickness of each processing layer 102 is 8-12 pm, and each processing layer 102 is perpendicular to the tangent of the outer arc line 204 at the position where it is located.

[0057] Then, the processing layer 102 is processed layer by layer by the femtosecond laser device. The metal waste generated in the processing process is vaporized under the action of the high-energy-density laser device, avoiding the influence of the waste on the processing of other processing layers 102.

[0058] Specifically, when processing the processing layer 102 by the femtosecond laser device, the angle between the laser of the laser device and the metal plate 1 is changed to achieve that each processing layer 102 is perpendicular to the tangent of the outer arc line 204 at the position where it is located.

[0059] Step S2, a thermoplastic resin is used as a matrix to manufacture the thermoplastic composite plate 2.

[0060] Specifically, the thermoplastic resin as a matrix is compounded with carbon fiber plate and the like to form the thermoplastic composite plate 2.

[0061] It should be noted that the thermoplastic resin matrix can ensure that the resin can be melted under the action of the ultrasonic welding device.

[0062] Step S3, by the ultrasonic welding device, the thermoplastic composite plate 2 is melted towards the thermoplastic resin at the connecting groove 101, and under the action of ultrasonic pressure and vibration, it flows into the connecting groove 101.

[0063] Specifically, the first pulse (short pulse) locally plasticizes the thermoplastic composite plate 2 towards the resin at the connecting groove 101 and preheats the melting; then the second pulse (long pulse) vibrates the melted thermoplastic resin, pushes the melted thermoplastic resin to fully penetrate into the connecting groove 101, and the vibration of the long pulse can avoid the thermal degradation and the generation of internal bubbles of the melted thermoplastic resin, thereby expanding the welding area, improving the connection strength, and reducing the strength fluctuation.

[0064] By the above method, the melted thermoplastic resin is penetrated into the connecting groove 101, the connection quality of the thermoplastic resin and the connecting groove 101 is improved, the compactness and fatigue resistance of the interface are improved, and the connection performance is significantly stronger than the traditional ultrasonic welding method.

[0065] Step S4, waiting for the melted thermoplastic resin flowing into the connecting groove 101 to form a connecting joint 201, so that the connecting joint 201 is mechanically locked with the connecting groove 101.

[0066] As Figure 4As shown, by setting the connecting joint 201, the connecting direction of each position of the connecting joint 201 and the connecting groove 101 is different, so that the force required for separating the connecting joint 201 and the connecting groove 101 needs to be changed according to the tangent direction of the outer arc line 204, thereby realizing the mechanical locking of the connecting joint 201 and the connecting groove 101, and the bonding force of the connecting joint 201 and the connecting groove 101 can further improve the connecting strength of the connecting joint 201 and the connecting groove 101.

[0067] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

[0068] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A releasable joint structure of a metal and a thermoplastic composite material, characterized by, The application relates to a metal plate (1) with a connecting groove (101) formed therein, a thermoplastic composite plate (2) with a connecting joint (201) formed on the end face of the metal plate (1), the connecting joint (201) being formed in the connecting groove (101) and detachable from the connecting groove (101). The first direction is defined as the direction perpendicular to the metal plate (1). In the first direction, the connecting joint (201) comprises a connecting face (202) and a pointed end (203) at the two ends of the connecting joint (201) respectively, the connecting joint (201) is connected to the thermoplastic composite plate (2) through the connecting face (202), and the connecting face (202) is in an elliptical shape. In the cross section of the long axis of the connecting joint (201) and the pointed end (203), the connecting joint (201) further comprises an outer arc line (204) and an inner arc line (205), the outer arc line (204) is arched towards the direction away from the inner arc line (205), and the inner arc line (205) is arched towards the direction of the outer arc line (204). In the cross section perpendicular to the tangent direction of the outer arc line (204), the cross-sectional area of the connecting joint (201) decreases from the connecting face (202) to the pointed end (203). The shape of the connecting joint (201) is consistent with the shape of the connecting groove (101). The arc expression of the outer arc line (204) is Wherein, x1 is the coordinate of the point on the outer arc line (204) in the long axis direction of the connecting joint (201); 2. A releasable joint of a metal and a thermoplastic composite material according to claim 1, characterized in that y1 is the coordinate of the point on the outer arc line (204) in the first direction; ； The arc expression of the inner arc line is Wherein, x2 is the coordinate of the point on the inner arc line in the long axis direction of the connecting joint (201); angle between a line connecting a point on the outer arc (204) and an end point of the long axis of the connecting joint (201) towards the outer arc (204) and the long axis of the connecting joint (201).

3. The metal and thermoplastic composite disassemblable joint structure according to claim 1, wherein y2 is the coordinate of the point on the inner arc line in the first direction. The tangent line of the position of the pointed end (203) is parallel to the long axis of the connecting joint (201). The projection of the pointed end (203) in the first direction is located at the end point of the long axis of the connecting face (202).

4. The metal and thermoplastic composite disassemblable joint structure according to claim 1, wherein The ratio of the long axis to the short axis of the connecting face (202) is 1.5:1 to 2.5:

1.

5. A releasable joint of a metal and a thermoplastic composite material according to claim 1 or 4, characterized in that The connecting joint (201) is symmetrical about the cross section (3) enclosed by the long axis of the connecting joint (201) and the pointed end (203).

6. The metal and thermoplastic composite disassemblable joint structure according to claim 1, wherein The application further relates to a manufacturing method of the metal plate (1) and the thermoplastic composite plate (2).

7. The metal and thermoplastic composite disassemblable joint structure according to claim 1, wherein Step S1: machining the connecting groove (101) on the end face of the metal plate (1); 8. A method of connecting a metal and thermoplastic composite dismountable connection structure according to any one of claims 1 to 7, characterized in that, Step S2: manufacturing the thermoplastic composite plate (2) by using thermoplastic resin as the matrix; Step S3: welding by using an ultrasonic welding device, melting the thermoplastic composite plate (2) at the connecting interface towards the resin at the connecting groove (101), and flowing into the connecting groove (101) under the action of ultrasonic pressure. ​ ​ Step S4, waiting for the molten thermoplastic resin flowing into the connecting groove (101) to form a connecting joint (201), so that the connecting joint (201) is mechanically locked with the connecting groove (101).

9. The method of claim 8, wherein the metal and thermoplastic composite dismountable connection structure is characterized by, In step S1, the connecting groove (101) is divided into a plurality of processing layers (102), and the processing layers are perpendicular to the tangent of the outer arc line (204) at the position of the processing layer (102); And the processing layer (102) is ablated layer by layer by a femtosecond laser device.

10. The method of claim 8, wherein the metal and thermoplastic composite dismountable connection structure is characterized by, Step S3 further comprises the following steps, Step S3.1, melting the resin in the area of the connecting groove (101) of the thermoplastic composite material plate (2) by a first pulse; Step S3.2, driving the molten resin to flow by a second pulse, and infiltrating into the connecting groove (101).

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