Friction welding structure

Abstract

To provide a friction welding structure that can enhance the strength of welded components after joining.SOLUTION: A first workpiece comprises a workpiece body and a first welded structure, and a second workpiece comprises a second workpiece body and a second welded structure. Both the first welded structure and the second welded structure are positioned between the first workpiece body and the second workpiece body. The first welded structure has a first lateral mating surface, and the second welded structure has a second lateral mating surface. The first lateral mating surface and the second lateral mating surface are in contact with each other and are fusion-bonded by relative motion between the first workpiece and the second workpiece. Since the first lateral mating surface and the second lateral mating surface that perform friction are parallel to a first direction, when the first workpiece and the second workpiece tend to separate from each other, tangential stress is generated between the first lateral mating surface and the second lateral mating surface, whereby the first workpiece and the second workpiece can be joined more firmly.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from a Chinese patent application bearing application number 2024105419655 and entitled "Friction Welding Structure," filed with the China Patent Office on April 30, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of friction welding, and more particularly to friction welded structures. [Background technology]

[0003] Plastics are a commonly used material in daily life and are processed into a variety of products. Traditional plastic welding processes generally include ultrasonic welding and vibration welding, both of which are used to weld two plastic parts together. Ultrasonic welding is generally suitable for small parts, while vibration welding is generally suitable for large plastic products.

[0004] Because warpage is likely to occur during ultrasonic welding of plastic components, vibration welding is more effective than ultrasonic welding for some plastic components. Vibration welding typically involves placing two workpieces (first and second workpieces) opposite each other (clamped in a jig) and fusing their opposing surfaces through relative motion between the two workpieces. As shown in FIG. 1 , the extension direction of the friction surface is usually perpendicular to the direction from the first workpiece to the second workpiece. Hereinafter, this welding method will be referred to as forward welding. In forward welding, the opposing end faces of the two workpieces to be welded are configured as welding surfaces, i.e., forward mating surfaces. When the workpieces have complex structures or when constructing a specific shaped receiving space, it is difficult for the workpieces to provide a continuous, large-area forward mating surface. This means that the area of ​​the forward mating surface to be welded is often limited. As a result, welded structures using forward mating surfaces are prone to solder fracture. For example, in the case of plastic members with complex structures, vibration welding tends to result in insufficient welding.

[0005] Take the example of a tray used in everyday life. It comprises a top tray lid and a bottom tray lid, and in order to ensure its appearance, its internal components are connected by friction welding and fixed without the use of fasteners. However, due to the limitations of the tray's external shape and structure, conventional vibration welding is unable to properly connect the top tray lid and bottom tray lid, and particularly in areas where the connection area between the tray and the seat is small, solder fractures are likely to occur at these connection points during drop tests. Summary of the Invention [Problem to be solved by the invention]

[0006] A main object of the present invention is to provide a friction welding structure that can improve the strength of welded members after joining. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a friction welding structure including a first workpiece and a second workpiece, wherein the first workpiece includes a first workpiece body and a first welding structure; the second workpiece includes a second workpiece body and a second welded structure, and the first welded structure and the second welded structure are both located between the first workpiece body and the second workpiece body; A friction welding structure is provided in which the direction from the first workpiece body to the second workpiece body is a first direction, the first welding structure has a first lateral mating surface along a side perpendicular to the first direction, and the second welding structure has a second lateral mating surface along a side perpendicular to the first direction, the first lateral mating surface and the second lateral mating surface abutting against each other and being fusion-spliced ​​by relative movement of the first workpiece and the second workpiece.

[0008] In some embodiments, the first welding structure includes a first welding projection connected to the first workpiece body, and the second welding structure includes a second welding projection connected to the second workpiece body; The direction from the first welding protrusion to the second welding protrusion is a second direction, and the direction of relative movement between the first workpiece and the second workpiece during welding is a third direction, and the first direction, second direction, and third direction intersect with each other.

[0009] In some embodiments, the first welding structure includes a plurality of first welding projections arranged at intervals along the second direction, with a first receiving groove formed between every two adjacent first welding projections; the second welding structure includes a plurality of second welding projections arranged at intervals along the second direction, with a second receiving groove formed between every two adjacent second welding projections; At least one second welding protrusion is inserted into the first receiving groove, and at least one first welding protrusion is inserted into the second receiving groove.

[0010] In some embodiments, an end of the first welding projection away from the first workpiece body abuts against a bottom wall of the second receiving groove away from the first workpiece body; and / or The end of the second welding protrusion that is remote from the second workpiece body abuts against the bottom wall of the first accommodating groove that is remote from the second workpiece body.

[0011] In some embodiments, prior to welding, the first welding projection and the second receiving groove are interference-fitted; and / or Before welding, the second welding protrusion and the first receiving groove are tightly fitted together.

[0012] In some embodiments, before welding, there is a flow gap between the first welding protrusion and the groove wall of the second receiving groove; and / or Before welding, there is a flow gap between the second welding protrusion and the groove wall of the first receiving groove.

[0013] In some embodiments, a first chamfer is provided on an end of the first welding protrusion away from the first workpiece body, and the first welding protrusion forms a flow gap between the first chamfer and a groove wall of the second accommodating groove; and / or the first lateral mating surface is stepped, and a flow gap is formed between the first lateral mating surface and the second lateral mating surface; and / or a second chamfer is provided on an end of the second welding protrusion away from the second workpiece body, and a flow gap is formed between the second welding protrusion and the groove wall of the first accommodating groove at the second chamfer; and / or The second lateral mating surface is stepped, and a flow gap is formed between the second lateral mating surface and the first lateral mating surface.

[0014] In some embodiments, the first workpiece body has a recessed groove, a first welding protrusion is provided in the recessed groove, and a second welding protrusion is inserted into the recessed groove and abuts against the first welding protrusion; Or, The second workpiece body has a recessed groove, a second welding protrusion is provided in the recessed groove, and the first welding protrusion fits into the recessed groove and abuts against the second welding protrusion.

[0015] In some embodiments, the first workpiece body is provided with a first weld rib, an end of the first weld rib away from the first workpiece body abuts the second workpiece body, and the first weld rib is fusion-spliced ​​to the second workpiece body upon relative movement of the first workpiece and the second workpiece; Or, A second welding rib is provided on the second workpiece body, and the end of the second welding rib away from the second workpiece body abuts the first workpiece body, and the second welding rib is fusion-spliced ​​to the first workpiece body due to relative movement between the first workpiece and the second workpiece.

[0016] In some embodiments, the first workpiece body is provided with a plurality of spaced apart first welding ribs, and ends of the first welding ribs that are away from the first workpiece body abut the second workpiece body, and the first welding ribs are fusion-connected to the second workpiece body by relative movement of the first workpiece and the second workpiece, and first connecting ribs are further provided between two adjacent first welding ribs, and the first connecting ribs are respectively connected to the first welding ribs on both sides; and / or The second workpiece body is provided with a plurality of spaced apart second welding ribs, the ends of the second welding ribs facing away from the second workpiece body abutting the first workpiece body, and the second welding ribs are fusion-connected to the first workpiece body by relative movement of the first workpiece and the second workpiece. Second connecting ribs are further provided between two adjacent second welding ribs, and the second connecting ribs are respectively connected to the second welding ribs on both sides. [Effects of the Invention]

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The friction welding structure of the present invention includes a first workpiece and a second workpiece, which are two members to be welded together. The first workpiece includes a first welding structure, and the second workpiece includes a second welding structure. The first welding structure and the second welding structure are positioned between the first workpiece and the second workpiece, and the first workpiece and the second workpiece are joined by welding the first welding structure and the second welding structure. Specifically, the direction from the first workpiece to the second workpiece is a first direction, the first welding structure has a first side mating surface along a side perpendicular to the first direction, the second welding structure has a second side mating surface along a side perpendicular to the first direction, the first side mating surface of the first welding structure abuts the second side mating surface of the second welding structure, the first side mating surface and the second side mating surface rub against each other to generate frictional heat, which heats and melts the first side mating surface and the second side mating surface, and after cooling, the first side mating surface and the second side mating surface are connected, so that the first welding structure and the second welding structure are connected, thereby connecting the first workpiece and the second workpiece.

[0019] In the friction welding structure of the present invention, the first and second lateral mating surfaces that cause friction are parallel to the first direction from the first workpiece to the second workpiece, so the area of ​​the friction mating surfaces is not limited. In the case of workpieces with complex structures, the welding surface available for forward welding is small, so by using the friction welding structure of the present invention, a large area of ​​lateral welding can be achieved, significantly improving the weld strength.

[0020] In order to more clearly describe the technical means in the embodiments of the present invention or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the structures shown in these drawings without any creative work. [Brief explanation of the drawings]

[0021] [Figure 1]1 is a schematic diagram of a welding structure using positive mating surface welding in the prior art; [Figure 2] 1 is a structural schematic diagram showing an embodiment of the present invention in which a first lateral mating surface and a second lateral mating surface both extend parallel to a first direction. [Figure 3] 1 is a structural schematic diagram showing an embodiment of the present invention in which a first side mating surface and a second side mating surface both extend at an angle relative to a first direction. [Figure 4] 1 is a structural schematic diagram of a friction welding structure with a larger friction area in one embodiment of the present invention, in which the first lateral mating surface and the second lateral mating surface both extend parallel to the first direction. [Figure 5] 1 is a structural schematic diagram of a friction welding structure with a larger friction area in one embodiment of the present invention, in which the first lateral mating surface and the second lateral mating surface both extend at an angle to the first direction. [Figure 6] 4 is a structural schematic diagram of a first receiving groove defined by a first welding structure in an embodiment of the present invention; FIG. [Figure 7] FIG. 10 is a structural schematic diagram of a second receiving groove defined by a second welding structure in an embodiment of the present invention. [Figure 8] 10 is a structural schematic diagram showing how the tip of the second welding protrusion abuts against the bottom wall of the first receiving groove in another embodiment of the present invention. [Figure 9] FIG. 10 is a structural schematic diagram of a friction welding structure with flow gap in another embodiment of the present invention. [Figure 10] 4 is a schematic diagram of the friction welding structure between the first welding protrusion and the groove provided on the second workpiece body in one embodiment of the present invention; FIG. [Figure 11] 10 is a structural schematic diagram of a second welding protrusion provided in a groove of a second workpiece body in an embodiment of the present invention; FIG. [Figure 12] 1 is a structural schematic diagram showing a cylindrical first welding structure and a cylindrical second welding structure according to an embodiment of the present invention; [Figure 13] FIG. 13 is a cross-sectional view of FIG. 12. [Figure 14]1 is a structural schematic diagram showing a first welding structure and a second welding structure in a cone shape according to an embodiment of the present invention; [Figure 15] 1 is a structural schematic diagram in which a first welding protrusion has a first chamfer and a second welding protrusion has a second chamfer in an embodiment of the present invention; [Figure 16] 1 is a structural schematic diagram of a tray lid according to an embodiment of the present invention; [Figure 17] FIG. 17 is a schematic structural view of the other side of the tray lid in FIG. 16. [Figure 18] FIG. 17 is a schematic structural view of the tray cover from another viewpoint in FIG. 16. [Figure 19] FIG. 19 is an enlarged view of part A in FIG. [Figure 20] 1 is a schematic diagram of the structure of a tray bottom cover in one embodiment of the present invention. [Figure 21] 21 is a schematic structural view of the other side of the tray bottom cover in FIG. 20. [Figure 22] FIG. 22 is an enlarged view of part B in FIG. [Figure 23] FIG. 22 is an enlarged view of part C in FIG. 21. [Figure 24] 1 is a structural schematic diagram of a tray in an embodiment of the present invention. [Figure 25] 1 is a structural schematic diagram of a children's dining table in one embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0022] The realization of the objects, functional features and advantages of the present invention will be further explained with reference to the drawings in combination with the embodiments.

[0023] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without any creative work fall within the protection scope of the present invention.

[0024] In addition, in the embodiments of the present invention, when directional instructions (e.g., up, down, left, right, front, back, etc.) are used, the directional instructions are only used to explain the relative positional relationship, movement status, etc. between each part in a specific posture, and if the specific posture changes, the directional instructions will also change accordingly.

[0025] Furthermore, when references to "first," "second," etc. appear in the embodiments of the present invention, such references are for illustrative purposes only and should not be understood as indicating or implying a relative importance or the number of technical features described. Thus, a feature defined by "first" or "second" may explicitly or implicitly include at least one of the features. Furthermore, the term "and / or," "and / or," or "and / or" used throughout the text means including three parallel alternatives. For example, "A and / or B" includes alternative A, alternative B, or alternatives where both A and B are satisfied. Furthermore, the technical means in each embodiment may be combined with one another, but this must be based on what a person skilled in the art can achieve. If a combination of technical means results in a contradiction or is impossible to achieve, such a combination of technical means does not exist and is not within the scope of protection of the present invention.

[0026] In the prior art, as shown in FIG. 1 , the extension direction of the friction surfaces of two workpieces used in friction welding is usually perpendicular to the direction from the first workpiece to the second workpiece. Hereinafter, this welding method will be referred to as forward welding. In forward welding, the opposing end faces of the two workpieces to be welded are configured as the welding surface, i.e., forward mating surface 600. When the workpieces have a complex structure or when constructing a specific shaped receiving space, it is difficult to provide a continuous, large area of ​​forward mating surface 600 on the workpieces. This means that the area of ​​the forward mating surface 600 to be welded is often limited. As a result, the welded structure welded using the forward mating surface 600 is prone to solder fracture. For example, when using vibration welding on plastic components with complex structures, the welding is likely to be insufficient.

[0027] 2 to 25, a friction welding structure according to an embodiment of the present invention will be described below. The friction welding structure of the present invention includes a first workpiece 100 and a second workpiece 200 to be used for welding. The first workpiece 100 includes a first workpiece body 110 and a first welding structure 120, and the second workpiece 200 includes a second workpiece body 210 and a second welding structure 220. Before welding, the first workpiece 100 and the second workpiece 200 are disposed opposite each other such that the first welding structure 120 and the second welding structure 220 are located between the first workpiece body 110 and the second workpiece body 210. The first welding structure 120 and the second welding structure 220 are members that are connected when welding the first workpiece 100 and the second workpiece 200, and the first workpiece 100 and the second workpiece 200 are joined by welding the first welding structure 120 and the second welding structure 220. The first workpiece 100 and the second workpiece 200 may be connected to each other only by the connection of the first welded structure 120 and the second welded structure 220 .

[0028] As shown in FIGS. 2 to 9, before welding, the first workpiece 100 is clamped by a first jig, and the second workpiece 200 is clamped by a second jig. Usually, the first workpiece 100 and the second workpiece 200 are arranged opposite to each other in the height direction. The first workpiece 100 and the second workpiece 200 extend substantially along the X direction. The direction in which the first workpiece 100 and the second workpiece 200 are arranged opposite to each other is the first direction Z. The first welding structure 120 is aligned in the first side direction. The first welding structure 120 has a surface 121, and the second welding structure 220 has a second lateral mating surface 221, the extension direction of which is parallel to the first direction Z or transverse to the first direction Z (including forming an angle with the first direction Z, i.e., inclined with respect to the first direction Z), the extension direction of which is parallel to the first direction Z or inclined with respect to the first direction Z, and the first lateral mating surface 121 of the first welding structure 120 abuts the second lateral mating surface 221 of the second welding structure 220. Because the extension directions of the first lateral mating surface 121 and the second lateral mating surface 221 are parallel to or inclined with respect to the first direction Z from the first workpiece 100 to the second workpiece 200, the friction welding of the present application is also referred to as lateral friction welding. During lateral friction welding, the relative movement between the first workpiece 100 and the second workpiece 200 causes the first lateral mating surface 121 and the second lateral mating surface 221 to rub against each other, generating frictional heat, which heats and melts the first lateral mating surface 121 and the second lateral mating surface 221. After cooling, the first lateral mating surface 121 and the second lateral mating surface 221 are connected, thereby connecting the first welded structure 120 and the second welded structure 220, and thereby connecting the first workpiece 100 and the second workpiece 200. Of course, in other embodiments, the first workpiece 100 and the second workpiece 200 may be arranged opposite each other along a horizontal direction (e.g., the X direction or the Y direction), for example.

[0029] 2-15, in some embodiments, the first welding structure 120 includes a first welding protrusion 122 connected to the first workpiece body 110, and the second welding structure 220 includes a second welding protrusion 222 connected to the second workpiece body 210. The direction in which the first workpiece 100 and the second workpiece 200 are arranged facing each other is a first direction Z, the direction in which the first workpiece 100 and the second workpiece 200 extend is a second direction X, and the direction of relative movement between the first workpiece 100 and the second workpiece 200 during welding is a third direction Y, where the second direction X is also defined as a direction perpendicular to both the first direction Z and the third direction Y. Specifically, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other. The first welding protrusion 122 has a first side mating surface 121, and the second welding protrusion 222 has a second side mating surface 221, and the first workpiece 100 moves along the third direction Y relative to the second workpiece 200, thereby friction welding the first side mating surface 121 and the second side mating surface 221 together.

[0030] In the friction welding structure of the present invention, the first lateral mating surface 121 and the second lateral mating surface 221 are parallel to the first direction Z or inclined relative to the first direction Z. In some embodiments, as shown in FIGS. 2, 4, 6 to 8, and 15, the first lateral mating surface 121 and the second lateral mating surface 221 are parallel to the first direction Z. In some embodiments, as shown in FIGS. 3 and 5, the first lateral mating surface 121 and the second lateral mating surface 221 are both inclined relative to the first direction Z. Preferably, the first lateral mating surface 121 and the second lateral mating surface 221 are inclined at a small angle relative to the first direction Z, more specifically, the inclination angle between the first lateral mating surface 121 and the second lateral mating surface 221 and the first direction Z is less than 45°. In the friction welding structure of the present invention, the area of ​​the friction mating surface between the first workpiece 100 and the second workpiece 200 is equal to the area of ​​the first lateral mating surface 121 and the second lateral mating surface 221, and is not limited to the area of ​​the forward mating surface between the first workpiece 100 and the second workpiece 200. This allows the area of ​​the friction mating surface between the first workpiece 100 and the second workpiece 200 to be significantly increased, making the welding between the first workpiece 100 and the second workpiece 200 stronger. Therefore, the friction welding structure of the present invention can be applied to the friction welding of workpieces with various complex structures.

[0031] 2, 4, 6-8, 10-11, and 15, the first welding structure 120 includes a first welding protrusion 122 connected to the first workpiece body 110 and extending substantially perpendicular to the first workpiece body 110, and the second welding structure 220 includes a second welding protrusion 222 connected to the second workpiece body 210 and extending substantially perpendicular to the second workpiece body 210. The first welding protrusion 122 and the second welding protrusion 222 have a substantially rectangular parallelepiped structure. The first welding protrusion 122 has a first lateral mating surface 121 extending parallel to the first direction Z, and the second welding protrusion 222 has a second lateral mating surface 221 extending parallel to the first direction Z. Of course, the first welding protrusion 122 and the second welding protrusion 222 do not necessarily have to have a rectangular parallelepiped structure, but may have the first lateral mating surface 121 and the second lateral mating surface 221 extending parallel to or inclined relative to the first direction Z. In other embodiments, as shown in Figures 2, 4, and 8, the first lateral mating surface 121 and the second lateral mating surface 221 are inclined relative to the first direction Z. The inclined first lateral mating surface 121 and the second lateral mating surface 221 can also increase the welding area, improve welding strength, and enhance stability.

[0032] As shown in Figures 10 and 11, in some embodiments, the first welding structure 120 is a protrusion, and the second welding structure 220 is a groove 400, and the protrusion configured as the first welding structure 120 is inserted into the groove 400 configured as the second welding structure 220, and when the first workpiece 100 and the second workpiece 200 are friction-welded, the first lateral mating surface 121 of the protrusion and the second lateral mating surface 221 of the groove 400 rub against each other, thereby fusion-splicing the first welding structure 120 and the second welding structure 220, thereby joining the first workpiece 100 and the second workpiece 200. In addition, the groove 400 can accommodate the molten material generated during the friction process between the first welding structure 120 and the second welding structure 220, and the molten material can fill the gap during friction welding between the first welding structure 120 and the second welding structure 220, providing a better welding effect and making the welding between the first workpiece 100 and the second workpiece 200 stronger.

[0033] 12 and 13 , in some embodiments, the first welding structure 120 is cylindrical, the second welding structure 220 is cylindrical, the first lateral mating surface 121 is the outer circumferential wall surface of the first welding structure 120, and the second lateral mating surface 221 is the inner circumferential wall surface of the second welding structure 220. The cylindrical member formed as the first welding structure 120 is inserted into the cylindrical member formed as the second welding structure 220, and the outer circumferential wall surface of the first welding structure 120 and the inner circumferential wall surface of the second welding structure 220 melt due to friction, thereby joining the first welding structure 120 and the second welding structure 220. Specifically, the first welding structure 120 rotates relative to the second welding structure 220 to generate friction. This embodiment provides shapes and combination methods of the first welding structure 120 and the second welding structure 220 that can be applied to first workpieces 100 and second workpieces 200 of different shapes.

[0034] 14 , in some embodiments, the first welding structure 120 is conical, the second welding structure 220 is conical, and the first lateral mating surface 121 and the second lateral mating surface 221 are both conical surfaces. The first welding structure 120 is inserted into the second welding structure 220, and when the first welding structure 120 rotates relative to the second welding structure 220, friction occurs between the first lateral mating surface 121 and the second lateral mating surface 221, causing friction welding between the first workpiece 100 and the second workpiece 200.

[0035] 6 and 7 , in some embodiments, the first welding structure 120 includes a first welding protrusion 122 and a first receiving groove 123 connected to the first workpiece body 110, and the second welding structure 220 includes a second welding protrusion 222 connected to the second workpiece body 210, and / or the first welding structure 120 includes a first welding protrusion 122 connected to the first workpiece body 110, and the second welding structure 220 includes a second welding protrusion 222 and a second receiving groove 223 connected to the second workpiece body 210. Prior to welding, the first welding protrusion 122 moves toward the bottom wall of the second receiving groove 223, and / or the second welding protrusion 222 moves toward the bottom wall of the first receiving groove 123. In some embodiments, after the tip of the first welding protrusion 122 contacts the bottom wall of the second accommodating groove 223, the first welding protrusion 122 and the second welding protrusion 222 move relatively in the third direction to perform friction welding, whereby the first lateral mating surface 121 and the second lateral mating surface 221 move relatively in the third direction Y to rub against each other, and the tip of the first welding protrusion 122 and the bottom wall of the second accommodating groove 223 move relatively in the third direction Y to rub against each other, thereby completing the friction welding between the first workpiece 100 and the second workpiece 200. In this way, the welded joint between the first workpiece 100 and the second workpiece 200 is achieved by friction welding between the first lateral mating surface 121 and the second lateral mating surface 221, which increases the area available for welding and improves the stability of the welding between the first workpiece 100 and the second workpiece 200. Optionally, before welding, a certain gap is left between the first welding protrusion 122 and the bottom wall of the second accommodating groove 223 along the first direction Z, and / or a certain gap is left between the second welding protrusion 222 and the bottom wall of the first accommodating groove 123, thereby forming a filling space for the molten material and improving the welding stability between the first workpiece 100 and the second workpiece 200.

[0036] Of course, in some embodiments, the tip of the second welding protrusion 222 abuts against the bottom wall of the first accommodating groove 123. When welding the first workpiece 100 and the second workpiece 200, the first welding protrusion 122 and the second welding protrusion 222, as well as the tip of the second welding protrusion 222 and the bottom wall of the first accommodating groove 123, move relatively along the third direction Y to perform friction welding.

[0037] It should be understood that in some embodiments, the tip of the first welding protrusion 122 abuts against the bottom wall of the second accommodating groove 223, and the tip of the second welding protrusion 222 abuts against the bottom wall of the first accommodating groove 123. When welding the first workpiece 100 and the second workpiece 200, the first welding protrusion 122 and the second welding protrusion 222, the tip of the first welding protrusion 122 and the bottom wall of the second accommodating groove 223, and the tip of the second welding protrusion 222 and the bottom wall of the first accommodating groove 123 move relatively along the third direction Y to perform friction welding.

[0038] As shown in FIGS. 6 to 8 and 15 , in some embodiments, the first welding structure 120 includes a plurality of first welding protrusions 122 spaced apart along the second direction X, with a first accommodating groove 123 formed between every two adjacent first welding protrusions 122, and / or the second welding structure 220 includes a plurality of second welding protrusions 222 spaced apart along the second direction X, with a second accommodating groove 223 formed between every two adjacent second welding protrusions 222. At least one second welding protrusion 222 is inserted into the first accommodating groove 123, specifically, the side surfaces of the second welding protrusion 222 abut against the side surfaces of the first accommodating groove 123 formed by two adjacent first welding protrusions 122, and the second welding protrusion 222 and the two adjacent first welding protrusions 122 move relatively along the third direction Y, thereby completing friction welding; and / or at least one first welding protrusion 122 is inserted into the second accommodating groove 223, specifically, the side surfaces of the first welding protrusion 122 abut against the side surfaces of the second accommodating groove 223 formed by two adjacent second welding protrusions 222, and the first welding protrusion 122 and the two adjacent second welding protrusions 222 move relatively along the third direction Y, thereby completing friction welding. In this way, by providing multiple lateral friction mating surfaces, the area used for welding in the friction welding structure is increased, improving the stability of the weld between the first workpiece 100 and the second workpiece 200.

[0039] 10 and 11, in some embodiments, the second welding structure 220 includes a recessed groove 400, and the first welding structure 120 is provided with a first welding protrusion 122 that can fit into the recessed groove 400, thereby forming a lateral friction weld between the first lateral mating surface 121 of the first welding protrusion 122 and the second lateral mating surface 221 of the recessed groove 400. The recessed groove 400 functions as a lateral friction mating surface while also functioning as a molten material pool.

[0040] 10 and 11 , in some embodiments, first welding structure 120 includes first welding protrusion 122, second welding structure 220 includes recessed groove 400, and second welding protrusion 222 is disposed within recessed groove 400. Specifically, first welding protrusion 122 includes first lateral mating surface 121, and second welding protrusion 222 includes second lateral mating surface 221, which in combination achieve lateral friction welding between first welding protrusion 122 and second welding protrusion 222.

[0041] 4, 5, and 15, in some embodiments, the end of the first welding protrusion 122 facing away from the first workpiece body 110 abuts against the bottom wall of the second accommodating groove 223 facing away from the first workpiece body 110. In this way, when welding the first workpiece 100 and the second workpiece 200, not only are the first lateral mating surfaces 121 and the second lateral mating surfaces 221 joined by friction caused by relative movement along the third direction Y, but also the end of the first welding protrusion 122 and the bottom wall of the second accommodating groove 223 joined by friction caused by relative movement along the third direction Y. This increases the area for frictional joining between the first workpiece 100 and the second workpiece 200, thereby making it possible to more firmly join the first workpiece 100 and the second workpiece 200.

[0042] 4, 5, and 15, in some embodiments, the end of the second welding protrusion 222 facing away from the second workpiece body 210 abuts against the bottom wall of the first accommodating groove 123 facing away from the second workpiece body 210. In this manner, when welding the first workpiece 100 and the second workpiece 200, not only are the first lateral mating surface 121 and the second lateral mating surface 221 joined together by friction caused by relative movement along the third direction Y, but also the end of the second welding protrusion 222 and the bottom wall of the first accommodating groove 123 joined together by friction caused by relative movement along the third direction Y. This increases the area for frictional joining between the first workpiece 100 and the second workpiece 200, thereby strengthening the joining between the first workpiece 100 and the second workpiece 200.

[0043] As shown in FIGS. 3, 4, and 14, in some embodiments, the central portion of the tip of the first welding protrusion 122 along the second direction X abuts against the bottom wall of the second accommodating groove 223, and both ends of the tip of the first welding protrusion 122 along the second direction X are spaced apart from the second accommodating groove 223. When welding the first workpiece 100 and the second workpiece 200, the tip of the first welding protrusion 122 and the bottom wall of the second accommodating groove 223 move relative to each other along the third direction Y to perform friction welding, and the first side-direction mating surface 121 and the second side-direction mating surface 221 move relative to each other along the third direction Y to perform friction welding, and the molten material generated when the tip of the first welding protrusion 122 and the bottom wall of the second accommodating groove 223 perform friction welding and the molten material generated when the first side-direction mating surface 121 and the second side-direction mating surface 221 perform friction welding flow into the flow gap 300 between the first welding protrusion 122 and the second accommodating groove 223. In this way, the molten material can fill and compensate for the minute uneven surfaces at the welding interface between the first workpiece 100 and the second workpiece 200, not only connecting the first workpiece 100 and the second workpiece 200 more firmly, but also improving the sealing and strength of the welded area and ensuring the stability and reliability of the welding effect.

[0044] It should be understood that in some embodiments, the central portion of the tip of the second welding protrusion 222 along the second direction X abuts against the bottom wall of the first accommodating groove 123, and both ends of the tip of the second welding protrusion 222 along the second direction X are spaced apart from the first accommodating groove 123, thereby forming a flow gap 300, which serves as an area for filling or replenishing the molten material generated when the first workpiece 100 and the second workpiece 200 are friction welded together, thereby improving the sealing and strength of the welded area.

[0045] 15 , in some embodiments, the first welding protrusion 122 and the second receiving groove 223 are tightly fitted together prior to welding, and / or the second welding protrusion 222 and the first receiving groove 123 are tightly fitted together prior to welding. The tight fit between the first welding protrusion 122 and the second receiving groove 223 allows the first welding protrusion 122 and the second receiving groove 223 to be more closely fitted together during welding, thereby increasing the frictional force between the first welding protrusion 122 and the second receiving groove 223 and resulting in faster heat generation. Furthermore, because the contact portion between the first welding protrusion 122 and the second receiving groove 223 wears out due to friction, the tight fit between the first welding protrusion 122 and the second receiving groove 223 prior to welding ensures stable contact between the first welding protrusion 122 and the second receiving groove 223 during friction welding, allowing the molten material to fully fill the gap, thereby improving the efficiency and quality of the friction welding.

[0046] Note that "before welding" refers to a state in which the first workpiece 100 and the second workpiece 200 are not yet assembled. Before welding, the first welding protrusion 122 and the second receiving groove 223 are tightly fitted together, specifically, the average size of the first welding protrusion 122 along the second direction X is larger than the average size of the second receiving groove 223, so that the first welding protrusion 122 is tightly fitted into the second receiving groove 223 when inserted into the second receiving groove 223. Before welding, the second welding protrusion 222 and the first receiving groove 123 are tightly fitted together, specifically, the average size of the second welding protrusion 222 along the second direction X is larger than the average size of the first receiving groove 123, so that the second welding protrusion 222 is tightly fitted into the first receiving groove 123 when inserted into the first receiving groove 123.

[0047] 9 and 15 , in some embodiments, before welding, there is a flow gap 300 between the first welding protrusion 122 and the groove wall of the second accommodating groove 223. Specifically, the first welding protrusion 122 has first lateral mating surfaces 121 arranged opposite to each other along the second direction X, and the first lateral mating surfaces 121 each abut against the second accommodating groove 223 to perform friction welding, with the flow gap 300 being formed between the end of the first welding protrusion 122 away from the first workpiece 100 and the wall surface of the second accommodating groove 223 facing the first workpiece 100. The flow gap 300 functions as an area for filling with molten material generated during friction welding between the first welding protrusion 122 and the second welding protrusion 222. The molten material can fill and compensate for the minute uneven surfaces at the welding interface between the first workpiece 100 and the second workpiece 200 through the flow gap 300, thereby more firmly connecting the first workpiece 100 and the second workpiece 200, improving the sealing and strength of the welding area, and ensuring the stability and reliability of the welding effect.

[0048] Of course, in some embodiments, there is a flow gap 300 between the second welding protrusion 222 and the groove wall of the first accommodating groove 123, and the flow gap 300 serves as an area for filling with molten material generated during friction welding between the first welding protrusion 122 and the second welding protrusion 222.

[0049] 15 , in some embodiments, a first chamfer 124 is provided on the end of the first welding protrusion 122 away from the first workpiece body 110, and the first welding protrusion 122 forms a flow gap 300 with the groove wall of the second accommodating groove 223 at the first chamfer 124. Specifically, a first chamfer 124 is provided on both sides of the end of the first welding protrusion 122 away from the first workpiece 100 in the second direction X, and an intermediate position of the end of the first welding protrusion 122 away from the first workpiece 100 in the second direction X abuts against the second accommodating groove 223, and the first welding protrusion 122 is tightly fitted into the second accommodating groove 223. When welding the first workpiece 100 and the second workpiece 200, a friction welding is performed between the center of the end of the first welding protrusion 122 away from the first workpiece 100 and the bottom wall of the second receiving groove 223 facing the first workpiece 100, generating molten material, and a friction welding is performed between the interference fit portion of the first welding protrusion 122 and the second receiving groove 223, generating molten material. The molten material flows into the flow gap 300, filling the minute irregularities at the welding interface between the first workpiece 100 and the second workpiece 200, not only providing a stronger connection between the first workpiece 100 and the second workpiece 200 but also improving the sealing and strength of the welded portion and ensuring a stable and reliable welding effect.

[0050] Of course, in some embodiments, the end of the second welding protrusion 222 away from the second workpiece body 210 is provided with a second chamfer 224, and the second welding protrusion 222 forms a flow gap 300 between the second chamfer 224 and the groove wall of the first accommodating groove 123.

[0051] 17 and 20 , in some embodiments, to further improve the stability of the weld between the first workpiece 100 and the second workpiece 200, the first workpiece body 110 is provided with a first weld rib 111, and an end of the first weld rib 111 away from the first workpiece body 110 abuts against the second workpiece body 210, and the first weld rib 111 is fusion-spliced ​​to the second workpiece 200 due to the relative movement between the first workpiece 100 and the second workpiece 200. As shown in FIGS. 17 and 20 , in some embodiments, the second workpiece body 210 is provided with a second weld rib 211, and an end of the second weld rib 211 away from the second workpiece body 210 abuts against the first workpiece body 110, and the second weld rib 211 is fusion-spliced ​​to the first workpiece 100 due to the relative movement between the second workpiece 200 and the first workpiece 100.

[0052] By providing the first welding rib 111 or the second welding rib 211 in the area where forward friction welding is applied, the welding effect in that area is strengthened and the strength of the welding between the first workpiece 100 and the second workpiece 200 is ensured.

[0053] 15 to 23, in some embodiments, the second workpiece body 210 is provided with a plurality of spaced apart second welding ribs 211, and the ends of the second welding ribs 211 away from the second workpiece body 210 abut against the first workpiece body 110, and the second welding ribs 211 are fusion-connected to the first workpiece body 110 by relative movement of the second workpiece 200 and the first workpiece 100. Second connecting ribs 212 are further provided between two adjacent second welding ribs 211, and the second connecting ribs 212 are respectively connected to the second welding ribs 211 on both sides. When friction welding the second workpiece 200 and the first workpiece 100, the second welding rib 211 may be swayed or deformed in the direction of friction due to its thin thickness. By providing a second connecting rib 212 to connect the second welding ribs 211 on both sides of the second connecting rib 212, the rigidity of the connected second welding ribs 211 can be improved, reducing deformation of the second welding ribs 211 during friction welding and improving the quality of the friction welding. Preferably, the second connecting rib 212 may be involved in part of the friction welding process (i.e., the second welding rib 211 is heated and melted first, and then the second connecting rib 212 is heated and melted after a certain period of time). The second connecting rib 212 melts and integrates with the second welding rib 211 at the appropriate time, increasing the amount of molten material and thereby more firmly welding the second workpiece 200 and the first workpiece 100. A first connecting rib may also be provided between the first welding ribs 111, and its function is the same as that of the second connecting rib 212.

[0054] It will be appreciated that, with reference to Figures 15 to 23, in some embodiments, the first welding rib 111 and the second welding rib 211 can be arranged in any shape suitable for friction welding between the first workpiece 100 and the second workpiece 200, for example, the first welding rib 111 can be curved, the first welding rib 111 can be interrupted and linear, and the second welding rib 211 can be curved, and the second welding rib 211 can be interrupted and linear.

[0055] In addition, in some embodiments, the height of the second connecting rib 212 is lower than that of the second welding rib 211, the second welding rib 211 is used for friction welding, the second connecting rib 212 mainly plays a supporting role for the second welding rib 211, and the second connecting rib 212 can preferably be involved in part of the friction welding process between the first workpiece 100 and the second workpiece 200.

[0056] Of course, in some embodiments, the height of the second connecting rib 212 may be flush with that of the second welding rib 211, and the second connecting rib 212 is involved in the entire friction welding process between the first workpiece 100 and the second workpiece 200.

[0057] In some embodiments, the friction welding structure of the present invention is used in a children's product. Specifically, as shown in FIGS. 15 to 24 , the children's product is a children's dining table 500, which includes a high chair 520 and a tray 510. The tray 510 includes a top cover and a bottom cover, the top cover of the tray 510 being the first workpiece 100, and the bottom cover of the tray 510 being the second workpiece 200. Corresponding to the top cover and the bottom cover of the tray 510, a flat portion 5101, an outer periphery 5102 located on the outer edge of the flat portion 5101, and a connecting corner 5103 are provided. Because the flat portion 5101 and the outer periphery 5102 have regular shapes and large areas, conventional forward friction welding is applicable. Because the connecting corner 5103 has a sharp shape and a small area, side-direction friction welding of the present invention is applicable.

[0058] In the region of the joining corner 5103 where the lateral friction welding of the present invention is applied, the top cover of the tray 510 is provided with a plurality of spaced-apart first welding protrusions 122, and the bottom cover of the tray 510 is provided with a corresponding plurality of spaced-apart second welding protrusions 222. Before welding, the first welding protrusions 122 and the second welding protrusions 222 are interference-fitted with each other, leaving a flow gap 300 between the tip of the first welding protrusion 122 facing the bottom cover of the tray 510 and the bottom cover of the tray 510, and a flow gap 300 between the tip of the second welding protrusion 222 facing the top cover of the tray 510 and the top cover of the tray 510. During welding, the molten material generated by the first welding protrusions 122 and the second welding protrusions 222 flows into the flow gap 300, thereby filling the minute uneven surfaces at the weld interface between the top cover of the tray 510 and the bottom cover of the tray 510, improving the sealing and strength of the welded area.

[0059] In the region of the flat portion 5101 and the outer periphery 5102 to which conventional forward friction welding is applied, a first welding rib 111 is provided in the flat portion 5101 of the top lid of the tray 510, a second welding rib 211 is provided in the flat portion 5101 of the bottom lid of the tray 510, and a second connecting rib is provided between two adjacent second welding ribs 211. The first welding rib 111 and the flat portion 5101 of the bottom lid of the tray 510 are friction welded together, and the second welding rib 211 and the flat portion 5101 of the top lid of the tray 510 are friction welded together. The first welding rib 111 is provided on the outer periphery 5102 of the top lid of the tray 510, and the first welding rib 111 on the outer periphery 5102 of the top lid of the tray 510 is shorter than the first welding rib 111 on the flat portion 5101 of the top lid of the tray 510. Second welding ribs 211 are provided on the outer periphery 5102 of the bottom lid of the tray 510, and the second welding ribs 211 on the outer periphery 5102 of the bottom lid of the tray 510 are shorter than the second welding ribs 211 on the flat portion 5101 of the bottom lid of the tray 510, and a second connecting rib is provided between two adjacent second welding ribs 211. The first welding rib 111 on the outer periphery 5102 of the top lid of the tray 510 and the outer periphery 5102 of the bottom lid of the tray 510 are friction-welded, and the second welding rib 211 on the outer periphery 5102 of the bottom lid of the tray 510 and the outer periphery 5102 of the top lid of the tray 510 are friction-welded.

[0060] The top lid and bottom lid of tray 510 are friction-welded together by lateral friction welding between first welding protrusion 122 and second welding protrusion 222 at connecting corner 5103, and forward friction welding between first welding rib 111 and second welding rib 211 at flat portion 5101 and outer peripheral portion 5102, and the welded tray 510 is attached to high chair 520 to form children's dining table 500.

[0061] Of course, in some embodiments, the child product may be a child car seat, and the child car seat may include a seat portion or a base, and the first workpiece 100 and the second workpiece 200 may be a seat upper cover and a seat lower cover of the seat portion, or a base upper cover and a base lower cover of the base. Also, the welding method of the present invention is not limited to children's products, but may also be applied to products in other fields such as lights, air intake pipes, and water supply pipes.

[0062] The above is merely a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. In the inventive concept of the present invention, the conversion of equivalent structures made by utilizing the contents of the specification and drawings of the present invention, or the direct / indirect application to other related technical fields, are all included in the protection scope of the present invention. [Explanation of symbols]

[0063] a first workpiece 100; a first workpiece body 110, a first welding rib 111, a first welding structure 120, a first lateral mating surface 121, a first welding protrusion 122, a first receiving groove 123, a first chamfer 124, a second workpiece 200; a second workpiece body 210, a second welding rib 211, a second connecting rib 212, a second welding structure 220, a second lateral mating surface 221, a second welding protrusion 222, a second receiving groove 223, a second chamfer 224, Flow gap 300, 400 grooves, Children's dining table 500, Tray 510, flat portion 5101, outer periphery 5102, connecting corner portion 5103, tray upper cover 511, tray lower cover 512, Highchair 520, positive mating surface 600; First direction Z, second direction X, third direction Y.

Claims

1. a first workpiece including a first workpiece body and a first welded structure connected to the first workpiece body; a second workpiece including a second workpiece body and a second welded structure connected to the second workpiece body; 1. A friction welding structure, characterized in that, before welding, the first workpiece and the second workpiece face each other in a first direction, the first welding structure has a first lateral mating surface extending parallel to or inclined with respect to the first direction, and the second welding structure has a second lateral mating surface extending parallel to or inclined with respect to the first direction, the first lateral mating surface and the second lateral mating surface abutting against each other and are fusion-spliced ​​by relative movement of the first workpiece and the second workpiece.

2. the first weld structure includes a first weld protrusion connected to the first workpiece body, and the second weld structure includes a second weld protrusion connected to the second workpiece body; 2. The friction welding structure of claim 1, wherein the first workpiece and the second workpiece move relatively along a third direction during welding, the third direction being perpendicular to the first direction, and the first welding protrusion and the second welding protrusion are arranged opposite each other in a second direction before welding, the second direction being perpendicular to both the first direction and the third direction.

3. the first welding structure includes a plurality of the first welding protrusions arranged at intervals along the second direction, and a first receiving groove is formed between every two adjacent first welding protrusions; the second welding structure includes a plurality of the second welding protrusions arranged at intervals along the second direction, and a second receiving groove is formed between every two adjacent second welding protrusions; 3. The friction welding structure according to claim 2, wherein at least one second welding protrusion is inserted into the first accommodating groove and at least one first welding protrusion is inserted into the second accommodating groove before welding.

4. Before welding, an end of the first welding projection that is remote from the first workpiece body abuts against a bottom wall of the second accommodating groove that is remote from the first workpiece body; and / or 4. The friction welding structure according to claim 3, wherein an end of the second welding projection remote from the second workpiece body abuts against a bottom wall of the first accommodating groove remote from the second workpiece body.

5. Before welding, there is a flow gap between the first welding protrusion and the groove wall of the second accommodating groove; and / or The friction welding structure according to claim 3, wherein before welding, there is a flow gap between the second welding protrusion and the groove wall of the first receiving groove.

6. Before welding, the first welding protrusion and the second receiving groove are tightly fitted together; and / or 6. The friction welding structure according to claim 4, wherein the second welding projection and the first receiving groove are tightly fitted together.

7. a first chamfer is provided on an end of the first welding protrusion away from the first workpiece body, and the first welding protrusion forms a flow gap between the first chamfer and a groove wall of the second accommodating groove; and / or 6. The friction welding structure according to claim 5, wherein a second chamfer is provided at an end of the second welding protrusion away from the second workpiece body, and the second welding protrusion forms a flow gap between the second chamfer and the groove wall of the first accommodating groove.

8. The first lateral mating surface is stepped, and a flow gap is formed between the first lateral mating surface and the second lateral mating surface; and / or 6. The friction welding structure of claim 5, wherein the second lateral mating surface is stepped, and a flow gap is formed between the second lateral mating surface and the first lateral mating surface.

9. a recessed groove is provided on the first workpiece body, the first welding protrusion is provided in the recessed groove, and the second welding protrusion is inserted into the recessed groove and abuts against the first welding protrusion; and / or 3. The friction welding structure according to claim 2, wherein the second workpiece body has a groove, the second welding projection is provided in the groove, and the first welding projection enters the groove and abuts against the second welding projection.

10. a first weld rib is provided on the first workpiece body, an end of the first weld rib away from the first workpiece body abuts against the second workpiece body, and the first weld rib is fusion-spliced ​​to the second workpiece body by relative movement of the first workpiece and the second workpiece; and / or 2. The friction welding structure of claim 1, wherein the second workpiece body is provided with a second welding rib, an end of the second welding rib away from the second workpiece body abuts the first workpiece body, and the second welding rib is fusion-spliced ​​to the first workpiece body by relative movement of the first workpiece and the second workpiece.

11. The first workpiece body is provided with a plurality of first welding ribs arranged at intervals, and ends of the first welding ribs away from the first workpiece body abut the second workpiece body, and the first welding ribs are fusion-connected to the second workpiece body by relative movement of the first workpiece and the second workpiece, and first connecting ribs are further provided between two adjacent first welding ribs, and the first connecting ribs are respectively connected to the first welding ribs on both sides; and / or 2. The friction welding structure of claim 1, wherein the second workpiece body is provided with a plurality of spaced apart second welding ribs, the ends of the second welding ribs away from the second workpiece body abutting the first workpiece body, the second welding ribs being fusion-connected to the first workpiece body by relative movement between the first workpiece and the second workpiece, and second connecting ribs are further provided between two adjacent second welding ribs, and the second connecting ribs are respectively connected to the second welding ribs on both sides.

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