Metal and thermoplastic composite dismountable connection structure and connection method

Abstract

The application relates to the technical field of dissimilar material connecting structures, and discloses a detachable connecting structure of metal and thermoplastic composite material and a connecting method, which 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 of the thermoplastic composite material 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; the connecting joint comprises connecting faces and a pointed end at two ends of the connecting joint respectively, the connecting faces are in an elliptical shape, the connecting joint comprises an outer arc line and an inner arc line in a cross section formed by the long axis of the connecting joint and the pointed end, 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. Through the arrangement of the connecting joint and the connecting groove, the connecting strength of the thermoplastic composite material plate and the metal plate can be improved in multiple directions, and the metal plate and the thermoplastic composite material plate can be detached through the action force in the outer arc line direction of the connecting joint.

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 a texture (such as grooving, dimpling, roughening treatment, etc.) on the surface of the metal to enhance the bonding strength of the resin and 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, but 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:

[0006] 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.

[0007] Further, the arc expression of the outer arc line is

[0008] ;

[0009] 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 line connecting 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.

[0010] Further, the arc expression of the inner arc line is

[0011]

[0012] Wherein, x2 is the coordinate of the point on the inner arc line in the direction of the long axis of the connecting joint;

[0013] y2 is the coordinate of the point on the inner arc line in the first direction.

[0014] 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.

[0015] 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.

[0016] Further, the ratio of the long axis to the short axis of the connecting surface ranges from 1.5:1 to 2.5:1.

[0017] Further, the connecting joint is symmetrical about the cross section formed by the long axis of the connecting joint and the sharp end.

[0018] 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,

[0019] Step S1, machining a connecting groove on the end face of the metal plate;

[0020] Step S2, using thermoplastic resin as the matrix to make a thermoplastic composite plate;

[0021] Step S3, welding by ultrasonic welding equipment, melting the thermoplastic composite plate at the connecting interface towards the resin at the connecting groove, and flowing into the connecting groove under the action of ultrasonic pressure;

[0022] Step S4, waiting for the molten thermoplastic resin flowing into the connecting groove to form a connecting joint, so that the connecting joint is mechanically locked with the connecting groove.

[0023] Further, in step S1, the connecting groove is divided into multiple machining layers, and the machining layer is perpendicular to the tangent of the outer arc line at the position of the machining layer.

[0024] And the machining layer is ablated layer by layer by femtosecond laser equipment.

[0025] Further, step S3 further includes the following steps,

[0026] Step S3.1, melting the resin of the thermoplastic composite plate towards the connecting groove area by the first pulse;

[0027] Step S3.2, driving the molten resin to flow by the second pulse, and penetrating the head towards the connecting groove.

[0028] Through the above-mentioned connecting joint and connecting groove, the connection strength of the thermoplastic composite plate and the metal plate in multiple directions can be improved, and at the same time, the metal plate and the thermoplastic composite plate can be disassembled by the force along the outer arc line direction of the connecting joint, thereby improving the material utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0029] 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.

[0030] Figure 1 is a schematic diagram of the detachable connection structure of metal and thermoplastic composite material provided by the present application.

[0031] Figure 2 is Figure 1 is a schematic diagram of the structure of the thermoplastic composite plate of the detachable connection structure of metal and thermoplastic composite material shown in the figure.

[0032] Figure 3is Figure 1 Fig. 1 is a structural schematic diagram of a metal plate of a detachable connection structure of a metal and a thermoplastic composite material.

[0033] Figure 4 is Figure 1 Fig. 2 is a split schematic diagram of the detachable connection structure of the metal and the thermoplastic composite material.

[0034] Fig. 1 is a structural schematic diagram of a metal plate of a detachable connection structure of a metal and a thermoplastic composite material. DETAILED DESCRIPTION

[0035] In order to make the objects, 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 protection of the present application.

[0036] As shown in Figure 1 and Figure 2 As an implementation manner, the present application provides a detachable connection structure of a metal and a thermoplastic composite material, which comprises a metal plate 1 and a thermoplastic composite material plate 2. The detachable connection structure is used to realize detachable connection of the metal plate 1 and the thermoplastic composite material plate 2, and ensure the connection strength of the metal plate 1 and the thermoplastic composite material plate 2 in each direction in the connected state.

[0037] The metal plate 1 is formed with a connection groove 101, and the connection groove 101 extends into the metal plate 1.

[0038] The thermoplastic composite material plate 2 is formed with a connection joint 201 on an end surface 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.

[0039] Meanwhile, the connection joint 201 and the connection groove 101 can be split, so as to split the metal plate 1 and the thermoplastic composite material plate 2, thereby facilitating recycling of the metal plate 1 and / or the thermoplastic composite material plate 2, and improving material utilization.

[0040] The direction of the vertical metal plate 1 is defined as a first direction; along the first direction, the connecting joint 201 includes a connecting surface 202 and a pointed end 203 located at two ends of the connecting joint 201 respectively, the connecting joint 201 is connected with the thermoplastic composite material plate 2 through the connecting surface 202, and the main body structure between the connecting surface 202 and the pointed end 203 of the connecting joint 201 is inserted into the connecting groove 101, so that the metal plate 1 and the thermoplastic composite material plate 2 are connected.

[0041] The connecting surface 202 is in an elliptical shape, and the elliptical connecting surface 202 includes a major axis and a minor axis.

[0042] In order to more clearly describe the technical solutions of the present application, the up, down, left, right, front and back directions are defined as shown in the drawings. Figure 2 The first direction refers to the height direction of the connecting joint 201, that is, the up-down direction in the drawings. Figure 2 The second direction refers to the major axis direction of the connecting surface 202, that is, the left-right direction in the drawings. Figure 2 The third direction refers to the minor axis direction of the connecting surface 202, that is, the front-back direction in the drawings. Figure 2

[0043] In the cross section 3 formed by the major axis of the connecting joint 201 and the pointed end 203, that is, in the cross section 3 surrounded by up, down, left and right, the connecting joint 201 further includes an outer arc line 204 and an inner arc line 205.

[0044] 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 area of the connecting joint 201 decreases from the connecting surface 202 to the pointed end 203 along the direction perpendicular to the tangent of the outer arc line 204. The connecting joint 201 with the cross section area decreasing gently from the connecting surface 202 to the pointed end 203 facilitates the disassembly of the metal plate 1 and the thermoplastic composite material plate 2.

[0045] At the same time, the connecting joint 201 has a curved pointed end structure as a whole, 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 along the tangent direction of the outer arc line 204.

[0046] 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 material plate 2.

[0047] As an implementation manner, the arc expression of the outer arc line 204 is

[0048] ;​

[0049] wherein x1 is the coordinate of the point on the outer arc line 204 in the direction of the long axis of the connecting joint 201;

[0050] y1 is the coordinate of the point on the outer arc line 204 in the first direction;

[0051] 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 facing the outer arc line 204 and the long axis of the connecting joint 201.

[0052] By setting the outer arc line 204 as a circular arc line, the part of the connecting joint 201 and the connecting groove 101 is made more smooth, so that when the metal plate 1 and the thermoplastic composite material plate 2 are disassembled, the connecting joint 201 can gradually slide out of the connecting groove 101 along the contour of the outer arc line 204, preventing the pressure concentration in some areas during the separation of the connecting joint 201 and the connecting groove 101, reducing the risk of damage to the metal plate 1 and the thermoplastic composite material plate 2, achieving damage-free disassembly, and improving the disassembly convenience of the metal plate 1 and the thermoplastic composite material plate 2.

[0053] and, the angle range of is 45° to 60°. Specifically, the angle range of is 50° to 55°. More specifically, the angle of is 52.5°.

[0054] By the above setting, it is avoided that the angle of is too small, resulting in that the length of the connecting joint 201 in the direction of the long axis is too large, and the height of the connecting joint 201 in the first direction is too small, thereby avoiding that the bending angle of the connecting joint 201 is too large, improving the separation convenience of the connecting joint 201 and the connecting groove 101, and further facilitating the disassembly of the metal plate 1 and the thermoplastic composite material plate 2.

[0055] By the above setting, it is avoided that the angle of is too large, resulting in that the length of the connecting joint 201 in the direction of the long axis is too small, and the height of the connecting joint 201 in the first direction is too large, thereby avoiding that the bending angle of the connecting joint 201 is too small, improving the connecting strength of the connecting joint 201 and the connecting groove 101, and further improving the connecting strength of the metal plate 1 and the thermoplastic composite material plate 2.

[0056] As an implementation manner, the circular arc radius of the outer arc line 204 is 0.6 mm, and the outer arc line 204, the inner arc line 205 and the tip 203 are located in the same plane, so as to provide a smooth disassembly path.

[0057] As an implementation manner, the arc line expression of the inner arc line is

[0058]

[0059] wherein x2 is the coordinate of the point on the inner arc line in the direction of the long axis connecting the joint 201;

[0060] y2 is the coordinate of the point on the inner arc line in the first direction;

[0061] Both a and β are parameters of the inner arc line 205.

[0062] By setting the inner arc line 205 as a hyperbolic shape, the connecting joint 201 expands 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 change in a gradient, optimize the stress distribution on the surface of the connecting joint 201 after the connecting joint 201 is connected with the connecting groove 101, and improve the fatigue performance, reduce the edge stress concentration, thereby improving the connection stability of the connecting joint 201 and the connecting groove 101.

[0063] wherein the values of a and β are in linear proportional relationship with the thickness t of the metal plate 1. By controlling the proportional relationship between the values of a and 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 at the same time, the reliable manufacturability of the laser melting processing of the connecting groove 101 and the filling of the thermoplastic resin of the connecting groove is ensured.

[0064] Specifically, a = 0.35 t, β = 0.20 t, more specifically, in the present implementation, a is 0.7 and β is 0.4.

[0065] 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 at the same time, 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.

[0066] As an implementation mode, the tangent line of the outer arc line 204 at the position of the tip 203 is parallel to the long axis of the connecting joint 201, that is, the tangent line of the outer arc line 204 at the position of the tip 203 is horizontal. The tangent line of the outer arc line 204 at the position of the tip 203 is horizontal, which is beneficial to the initial position of disassembly, and by applying a horizontal force, the connecting joint 201 and the connecting groove 101 are separated, the disassembly resistance is reduced, and the disassembly convenience is improved.

[0067] As an implementation form, the projection of the pointed end 203 in the first direction is located in the connecting surface 202, so that the connecting joint 201 has different tangent lines connected with the connecting groove 101 in different directions, thereby realizing the engagement of the connecting joint 201 and the connecting groove 101 in different directions, preventing the separation of the connecting joint 201 from the connecting groove 101 under the action of one orientation, and improving the connection stability of the connecting joint 201 and the connecting groove 101.

[0068] As an implementation form, 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.

[0069] In 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, in 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, and 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.

[0070] Specifically, the long axis length of the connecting surface 202 is 0.8 mm, and the short axis length of the connecting surface 202 is 0.4 mm.

[0071] Through the above setting, the size of the connecting joint 201 can be reduced, and the manufacturing cost of the connecting joint 201 is reduced.

[0072] Through the above setting, the size of the connecting joint 201 can be reduced, and the manufacturing cost of the connecting joint 201 is reduced.

[0073] As an implementation form, the connecting joint 201 is symmetric about the cross section 3 formed by the long axis of the connecting joint 201 and the pointed end 203, which improves the manufacturing convenience of the connecting joint 201, and makes the force in each direction of the connecting joint 201 symmetric, thereby ensuring that the connecting joint 201 has more reliable mechanical properties. At the same time, during disassembly, only the disassembly force needs to be ensured in the cross section formed by the long axis of the connecting joint 201 and the pointed end 203, thereby improving the disassembly convenience of the connecting joint 201 and the connecting groove 101.

[0074] 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 on each connecting joint 201 are parallel to each other, and the orientations of the pointed ends 203 are consistent.

[0075] With the above-mentioned structural connection joint 201, when multiple connection joints 201 are formed on the thermoplastic composite material plate 2, the direction of the force required for each connection joint 201 to separate from the connection groove 101 is different, thereby improving the connection strength between the metal plate 1 and the thermoplastic composite material plate 2.

[0076] As one implementation, this application provides a connection method for a detachable connection structure of metal and thermoplastic composite materials, including the following steps:

[0077] Step S1: Machining a connecting groove 101 on the end face of the metal plate 1.

[0078] like Figure 3 As shown, when machining the connecting groove 101, the connecting groove 101 is divided into multiple machining layers 102. The thickness of each machining layer 102 is 8µm-12µm, and each machining layer 102 is perpendicular to the tangent of the outer arc line 204 at its location.

[0079] Then, the processing layer 102 is ablated layer by layer by a femtosecond laser device. The metal waste generated during the processing is vaporized under the action of the high energy density laser device, which avoids the waste from the processing affecting the processing of other processing layers 102.

[0080] Specifically, when processing the processing layer 102 using a femtosecond laser device, the angle between the laser of the laser device and the metal plate 1 is changed to make each processing layer 102 perpendicular to the tangent of the outer arc 204 at its location.

[0081] Step S2: Thermoplastic composite material plate 2 is made using thermoplastic resin as the matrix.

[0082] Specifically, thermoplastic resin is used as a matrix and combined with carbon fiber sheets to form thermoplastic composite material sheet 2.

[0083] It should be noted that the thermoplastic resin matrix ensures that the resin can melt under the action of ultrasonic welding equipment.

[0084] Step S3: Using an ultrasonic welding device, the thermoplastic composite material plate 2 is melted towards the connecting groove 101, and then flows into the connecting groove 101 under ultrasonic pressure and vibration.

[0085] Specifically, the thermoplastic composite material plate 2 is locally plasticized by the first pulse (short pulse) towards the resin at the connecting groove 101 and preheats the melting; then the melted thermoplastic resin is vibrated by the second pulse (long pulse) to push the melted thermoplastic resin to fully penetrate into the connecting groove 101, and by vibrating the melted thermoplastic resin by the long pulse, the thermal degradation and the generation of internal bubbles of the melted thermoplastic resin can be avoided, thereby expanding the welding area, improving the connection strength, and reducing the strength fluctuation.

[0086] 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 interface density and fatigue resistance are improved, and the connection performance is significantly stronger than the traditional ultrasonic welding method.

[0087] Step S4, waiting for the melted thermoplastic resin flowing into the connecting groove 101 to form the connecting joint 201, so that the connecting joint 201 is mechanically locked with the connecting groove 101.

[0088] As shown in Figure 4 By the above structure of 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 to separate 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 connection strength of the connecting joint 201 and the connecting groove 101.

[0089] The above only describes the embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. 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.

[0090] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes 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) and a thermoplastic composite plate (2) connected by a connecting joint (201). The application comprises: 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 being detachable from the connecting groove (101); wherein the direction perpendicular to the metal plate (1) is defined as the first direction; along the first direction, the connecting joint (201) comprises a connecting face (202) and a pointed end (203) respectively located at the two ends of the connecting joint (201), the connecting joint (201) is connected with the thermoplastic composite plate (2) through the connecting face (202), the main body structure of the connecting joint (201) between the connecting face (202) and the pointed end (203) is inserted into the connecting groove (101) to connect the metal plate (1) and the thermoplastic composite plate (2), and the connecting face (202) is in an elliptical shape; in the cross section formed by 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); along 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); further, the shape of the connecting joint (201) is consistent with the shape of the connecting groove (101); the arc expression of the inner arc line is 2. A releasable joint of a metal and a thermoplastic composite material according to claim 1, characterized in that wherein x2 is the coordinate of a point on the inner arc line in the long axis direction of the connecting joint (201); y2 is the coordinate of the point on the first direction; alpha=0.35t, beta=0.20t; and t is the thickness of the metal plate (1). ； the arc expression of the outer arc line (204) is wherein x1 is the coordinate of a point on the outer arc line (204) 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 y1 is the coordinate of the point on the first direction; 4. A releasable joint of a metal and a thermoplastic composite material according to claim 1 or 3, characterized in that the tangent line of the outer arc line (204) at the position of the pointed end (203) is parallel to the long axis of the connecting joint (201).

5. The metal and thermoplastic composite disassemblable joint structure according to claim 1, wherein the projection of the pointed end (203) along the first direction is located at the end point of the long axis of the connecting face (202).

6. 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.

7. A method of connecting a metal and thermoplastic composite dismountable connection structure according to any one of claims 1 to 6, characterized in that, the connecting joint (201) is symmetrical about the cross section (3) formed by the long axis of the connecting joint (201) and the pointed end (203). the application comprises the following steps, step S1, machining the connecting groove (101) on the end face of the metal plate (1); step S2, manufacturing the thermoplastic composite plate (2) by using a thermoplastic resin as a matrix. Step S3, welding by ultrasonic welding equipment, melts the thermoplastic composite material plate (2) at the connection interface towards the resin at the connection groove (101), and under the action of ultrasonic pressure, flows into the connection groove (101); Step S4, waiting for the molten thermoplastic resin flowing into the connection groove (101) to form a connection joint (201), so that the connection joint (201) is mechanically locked with the connection groove (101).

8. The method of claim 7, wherein the metal and thermoplastic composite dismountable connection structure is characterized by, In step S1, the connection groove (101) is divided into a plurality of processing layers (102), and the processing layer is 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.

9. The method of claim 7, wherein the metal and thermoplastic composite dismountable connection structure is characterized by, Step S3 further comprises the following steps, Step S3.1, melt the resin at the area of the connection groove (101) of the thermoplastic composite material plate (2) by the first pulse; Step S3.2, drive the molten resin to flow by the second pulse, and penetrate into the connection groove (101).

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