Copper-magnesium-aluminum spot welding device and method

Abstract

The invention discloses a copper-magnesium-aluminum spot welding device, and relates to the technical field of spot welding of dissimilar materials. The device comprises a hydraulic rotary seat, a driving assembly is installed at the top of the hydraulic rotary seat, a driving shaft is installed at the output end of the driving assembly, a jacking sleeve assembly is fixedly installed at the bottom of the hydraulic rotary seat, and the driving shaft is rotationally connected into the hydraulic rotary seat and the jacking sleeve assembly; a jacking oil cylinder is fixedly connected to the bottom of the hydraulic rotary seat, a gap exists between the jacking oil cylinder and the jacking sleeve assembly, and a plate to be connected is placed between the jacking oil cylinder and the jacking sleeve assembly. Through the unique design of the internal threads and the external threads of the cock sleeve and the synergistic effect of the driving motor and the hydraulic system, high-quality spot welding of the copper-magnesium-aluminum dissimilar alloy is achieved, and the problems of joint brittle failure caused by excessive intermetallic compounds in traditional melting spot welding and gaps existing in traditional riveting are effectively solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of spot welding of dissimilar materials, in particular to a copper-magnesium-aluminum spot welding device and method. BACKGROUND

[0002] The melting welding, ultrasonic welding, laser welding and resistance welding all have the problems of low welding quality and a large number of intermetallic brittle compounds in the welding zone due to metal melting and re-solidification, which easily causes brittle fracture of the spot welding joint.

[0003] Although the molecular diffusion welding and brazing can well reduce the generation of intermetallic brittle compounds, the spot welding strength is low, and it is difficult to be used as a spot welding process of a load-bearing structure.

[0004] The friction stir welding as a solid-phase welding means has good welding strength and less intermetallic brittle compounds, but has the problems of long spot welding time, high equipment requirement and large equipment area, and at the same time, the copper-magnesium-aluminum three kinds of metals cannot be simultaneously spot welded, and the same problem exists in the spot welding of thick plates, such as plates with a thickness of 5 mm or more. SUMMARY

[0005] The application aims to provide a copper-magnesium-aluminum spot welding device and method, realize high-quality spot welding of copper-magnesium-aluminum dissimilar alloys, and solve the joint brittle fracture caused by too many intermetallic compounds in traditional melting spot welding and the gap problem of the joint caused by traditional riveting.

[0006] According to the first aspect of the application, in order to achieve the above-mentioned purpose, the application provides the following technical scheme: a copper-magnesium-aluminum spot welding device, comprising a hydraulic rotary seat, a driving assembly is installed on the top of the hydraulic rotary seat, a driving shaft is installed at the output end of the driving assembly, a top pressing sleeve assembly is fixedly installed at the bottom of the hydraulic rotary seat, and the driving shaft is rotationally connected inside the hydraulic rotary seat and the top pressing sleeve assembly;

[0007] A jacking oil cylinder is fixedly connected to the bottom of the hydraulic rotary seat, and a gap exists between the jacking oil cylinder and the top pressing sleeve assembly, and the plate to be connected is placed between the jacking oil cylinder and the top pressing sleeve assembly;

[0008] An extrusion sleeve is sleeved on the outer surface of the bottom end of the driving shaft, a plug sleeve is coaxially arranged at the bottom end of the extrusion sleeve, the outer side of the plug sleeve is provided with external threads, the inner side of the plug sleeve is provided with internal threads, the rotation directions of the external threads and the internal threads are opposite, and the pitches of the external threads and the internal threads are different, and the plug sleeve and the extrusion sleeve can rotate relative to each other;

[0009] When the driving shaft rotates, the plug sleeve and the extrusion sleeve rotate simultaneously. In the rotating process, high-speed friction between the plug sleeve and the to-be-connected plate generates heat and softens the to-be-connected plate, forming solid-phase welding. At the same time, the plug sleeve is rotated into the to-be-connected plate under the downward force of the extrusion sleeve.

[0010] Further, the hydraulic pump is connected with the hydraulic swing base and the lifting oil cylinder through the oil supply pipeline and the oil return pipeline respectively, and is used to drive the hydraulic swing base and the lifting oil cylinder to stretch and retract simultaneously.

[0011] Further, the movement directions of the hydraulic swing base and the lifting oil cylinder are always opposite, and are used to fix the position of the to-be-connected plate.

[0012] Further, the to-be-connected plate includes an upper plate and a lower plate, and the materials of the upper plate and the lower plate are different.

[0013] Further, the top pressing sleeve assembly includes a top pressing sleeve shell fixedly installed on the bottom of the hydraulic swing base, an inner cavity is formed between the top pressing sleeve shell and the hydraulic swing base, a piston is slidably connected in the inner cavity along the axial direction, the driving shaft is rotatably connected in the hydraulic swing base through a swing bearing, and the extrusion sleeve is rotatably connected in the top pressing sleeve shell through a swing bearing, and the extrusion sleeve moves along with the piston when the piston moves up and down.

[0014] The bottom end of the top pressing sleeve shell is fixedly installed with a guide cylinder, and the extrusion sleeve and the plug sleeve are rotatably connected in the guide cylinder and are coaxially arranged.

[0015] Further, the driving assembly is an electric motor, the output end of the electric motor is fixedly connected with the driving shaft, the two sides of the end of the driving shaft away from the electric motor are fixedly connected with keys, and the interiors of the extrusion sleeve and the plug sleeve are respectively provided with first and second key grooves matched with the keys.

[0016] Further, the extrusion sleeve includes a rough connecting part and a fine connecting part, the rough connecting part and the fine connecting part are integrally formed, through holes are formed in the centers of the rough connecting part and the fine connecting part, and the first key groove is formed on the inner wall of the through hole at the position of the fine connecting part.

[0017] Further, the plug sleeve is a hollow cylinder, and the thermal stability of the plug sleeve is greater than that of the to-be-connected plate.

[0018] Further, the diameter of the plug sleeve is equal to the diameter of the fine connecting part of the extrusion sleeve, and the first key groove and the second key groove are aligned.

[0019] According to the second aspect of the present application, the present application provides a copper-magnesium-aluminum spot welding method, which applies the copper-magnesium-aluminum spot welding device described in the first aspect, and includes the following steps:

[0020] S1. When preparing to start welding, first stack two kinds of heterogeneous plate to be connected and place on the jacking oil cylinder, then provide hydraulic oil to the inside of the jacking oil cylinder and the hydraulic rotary seat through the hydraulic pump, drive the jacking oil cylinder to move upward, drive the hydraulic rotary seat to drive the pressing sleeve assembly to move downward, so that the plate to be connected can be completely pressed and fixed, at this time the driving shaft and the lower end surface of the plug sleeve are completely combined with the upper surface of the upper plate to be connected;

[0021] S2. When entering the welding stage, start the motor to drive the driving shaft to rotate, the driving shaft will drive the pressing sleeve and the plug sleeve to rotate at the same time, and at the same time of rotating, the pressing sleeve presses downward the plug sleeve, forcing the plug sleeve to generate high-speed friction with the plate to be connected and soften the plate to be connected, forming solid phase welding;

[0022] S3. With the progress of the welding process, the plug sleeve is gradually completely pressed out until the upper end surface thereof coincides with the upper surface of the upper plate, at this time the plug sleeve has been completely separated from the driving shaft, losing high-speed rotating motion in an instant, at the same time the pressing sleeve stops pressing, the plug sleeve is stopped in the plate to be connected in an instant, and the internal thread and the external thread realize double connection of solid phase welding and mechanical interlocking with the plate to be connected.

[0023] The present application has at least the following advantages:

[0024] 1. The present application realizes high-quality spot welding of copper-magnesium-aluminum heterogeneous alloy through the unique design of plug sleeve internal and external threads, the synergistic effect of the driving motor and the hydraulic system, effectively avoids the joint brittle fracture caused by too many intermetallic compounds in traditional fusion welding, and solves the gap problem existing in traditional riveting.

[0025] 2. The present application can realize various simultaneous stacking welding of copper-magnesium-aluminum heterogeneous alloy, including simultaneous stacking welding of three kinds of metals and welding of different thickness plates, which is difficult to achieve by traditional fusion welding, widens the application range of welding process, and in the case of stacking of heterogeneous alloy plates, the placement order of the plates does not need to be considered, improving the flexibility and convenience of welding.

[0026] 3. The optimization design and reasonable cooperation of each component in the present application ensure the stability and reliability of the welding process, reduce the welding interruption and adjustment times, improve the welding efficiency, and each component is easy to manufacture and assemble, simplifying the maintenance and repair work, reducing the maintenance cost and downtime of the equipment, improving the production efficiency and economic benefits.

[0027] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic view of the overall structure of the present application.

[0029] Figure 2 is a schematic view of the overall structure of the present application in a front view

[0030] Figure 3 is a schematic view of the overall structure of the present application in a side view

[0031] Figure 4 is a schematic view of the welding process of the plate to be connected in the present application, wherein (a) represents a schematic view of the initial state of welding, (b) represents a schematic view of the intermediate state of welding, and (c) represents a schematic view of the end state of welding;

[0032] Figure 5 is a schematic view of the driving shaft in the present application in a side view;

[0033] Figure 6 is a schematic view of the driving shaft in the present application in a top view

[0034] Figure 7 is a schematic view of the extrusion sleeve in the present application in a side view;

[0035] Figure 8 is a schematic view of the extrusion sleeve in the present application in a top view;

[0036] Figure 9 is a schematic view of the plug sleeve in the present application in a side view;

[0037] Figure 10 is a schematic view of the plug sleeve in the present application in a top view.

[0038] Reference signs:

[0039] 1, driving assembly; 2, hydraulic pump; 3, hydraulic rotary seat; 4, pressing sleeve assembly; 41, pressing sleeve shell; 42, inner cavity; 43, piston; 44, rotary bearing; 45, guide cylinder; 5, plate to be connected; 51, upper plate; 52, lower plate; 6, jacking oil cylinder; 7, driving shaft; 71, key; 8, extrusion sleeve; 81, first key groove; 82, rough connecting part; 83, fine connecting part; 9, plug sleeve; 91, second key groove; 92, external thread; 93, internal thread. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0041] Embodiment one:

[0042] Please refer toFigures 1-3 The present invention provides a technical solution: a copper-magnesium-aluminum spot welding device, applied in the field of welding dissimilar materials of copper, magnesium and aluminum, including a hydraulic rotary seat 3, a drive assembly 1 installed on the top of the hydraulic rotary seat 3, a drive shaft 7 installed on the output end of the drive assembly 1, a top pressure sleeve assembly 4 fixedly installed on the bottom of the hydraulic rotary seat 3, and the drive shaft 7 rotatably connected to the hydraulic rotary seat 3 and the top pressure sleeve assembly 4.

[0043] A lifting cylinder 6 is fixedly connected to the bottom of the hydraulic rotary seat 3. There is a gap between the lifting cylinder 6 and the top pressure sleeve assembly 4. The plate 5 to be connected is placed between the lifting cylinder 6 and the top pressure sleeve assembly 4.

[0044] A compression sleeve 8 is fitted on the outer surface of the bottom end of the drive shaft 7. A plug sleeve 9 is coaxially provided at the bottom end of the compression sleeve 8. The plug sleeve 9 has an external thread 92 on the outer side and an internal thread 93 on the inner side. The external thread 92 and the internal thread 93 have opposite directions of rotation and different pitches. The plug sleeve 9 and the compression sleeve 8 can rotate relative to each other.

[0045] like Figure 4 As shown, when the drive shaft 7 rotates, it will drive the plug sleeve 9 and the extrusion sleeve 8 to rotate simultaneously. During the rotation, the plug sleeve 9 and the plate to be connected 5 generate high-speed friction and heat, softening the plate to be connected 5 and forming solid-phase welding. At the same time, the plug sleeve 9 will be screwed into the plate to be connected 5 under the downward force of the extrusion sleeve 8, and will stop instantly when it is fully screwed into the plate to be connected 5, realizing the mechanical interlock between the plug sleeve 9 and the plate to be connected 5.

[0046] It should be noted that the pitch of the external thread 92 of the plug sleeve 9 is greater than that of the internal thread 93. This is because the external thread 92 has a larger contact area with the plate 5 to be connected, requiring more material flow to be accommodated during screwing. When the plug sleeve 9 rotates at high speed, the high-speed friction generates heat, softening the plate 5 to be connected. Therefore, the softened material of the plate 5 will flow between the threads during high-speed rotation of the plug sleeve 9. The larger pitch of the external thread 92 allows for more material flow. The internal thread 93, however, rotates in the opposite direction to the external thread 92. Its main function is to allow for more material flow during high-speed rotation. The thread 93 will generate greater friction with the plate 5, which will facilitate the generation of more heat to soften the plate 5 to be connected. After the plate 5 is softened, the plug sleeve 9 can better bond with the metal of the plate 5 to form a solid phase weld. Furthermore, due to the softening of the plate 5 and the downward force of the compression sleeve 8 when the plug sleeve 9 rotates, the plug sleeve 9 will not interfere with the internal and external threads 92. The plug sleeve 9 will be squeezed into the softened plate 5 to be connected. In this way, after the plate 5 is cooled, a solid phase weld and mechanical interlock will be formed simultaneously.

[0047] Further, the plug sleeve 9 is provided in a hollow cylindrical shape, and the thermal stability of the plug sleeve 9 is greater than that of the to-be-connected plate 5, so that the thermal stability of the plug sleeve 9 is stronger than that of the to-be-connected plate 5, and the screws of the internal thread 93 and the external thread 92 of the plug sleeve 9 will not be damaged during high-speed friction, and the plug sleeve 9 will not affect the process of being screwed in. According to the technical scheme of the embodiment, the plug sleeve 9 is made of H13 die steel, SKD61 die steel or DC53 die steel.

[0048] As shown in Figure 1 , according to the technical scheme of the embodiment, the copper-magnesium-aluminum spot welding device further comprises a hydraulic pump 2, which is connected with the hydraulic swing base 3 and the lifting oil cylinder 6 through oil supply pipelines and oil return pipelines respectively, and is used to drive the hydraulic swing base 3 and the lifting oil cylinder 6 to extend and retract at the same time. When extending, the hydraulic pump 2 will deliver high-pressure oil into the hydraulic swing base 3 and the lifting oil cylinder 6 through the oil supply pipelines, and push the piston 43 to move, so as to realize extension. When the piston 43 moves, the oil on the other side needs to return to the oil tank through the oil return pipelines, so as to keep the circulation and balance of the hydraulic system.

[0049] According to the technical scheme of the embodiment, as shown in Figure 2 and Figure 3 , the movement directions of the hydraulic swing base 3 and the lifting oil cylinder 6 are always opposite, which is used to fix the position of the to-be-connected plate 5. When welding the to-be-connected plate 5 is needed, the lifting oil cylinder 6 extends upward, and at the same time, the hydraulic swing base 3 drives the pressing sleeve assembly 4 to move downward, so as to completely press and fix the to-be-connected plate 5. At this time, the driving shaft 7 and the lower end surface of the plug sleeve 9 are completely attached to the upper surface of the to-be-connected plate 5. It needs to be noted that the copper-magnesium-aluminum dissimilar alloys can be welded in any matching form, and there is no need to consider the placement order of the plate 5, which increases the flexibility and applicability of welding.

[0050] According to the technical scheme of the embodiment, as shown in Figure 4 , the to-be-connected plate 5 comprises an upper plate 51 and a lower plate 52, and the materials of the upper plate 51 and the lower plate 52 are different. The material of the upper plate 51 or the lower plate 52 can be any one of copper, magnesium or aluminum. However, since the materials of the upper plate 51 and the lower plate 52 are different, when the upper plate 51 is copper, the material of the lower plate 52 is set as magnesium or aluminum, and so on. It needs to be noted that in the embodiment, copper, magnesium or aluminum materials are taken as examples for illustration, but the specific types of the plate 5 materials are not limited. If other technical schemes in the art change only the types of the plate 5 materials compared with the embodiment, they will also fall within the protection scope of the embodiment.

[0051] According to the technical scheme of the embodiment, as shown in Figure 2 and Figure 3As shown, the role of the top pressing sleeve assembly 4 is to provide a pressing force for the extrusion sleeve 8, and the top pressing sleeve assembly 4 includes a top pressing sleeve shell 41 fixedly installed on the bottom of the hydraulic rotary seat 3 by bolts, and an inner cavity 42 is formed between the top pressing sleeve shell 41 and the hydraulic rotary seat 3. The inner cavity 42 is slidably connected with a piston 43 along the axial direction, the drive shaft 7 is rotatably connected inside the hydraulic rotary seat 3 through a rotary bearing 44, and the extrusion sleeve 8 is rotatably connected inside the top pressing sleeve shell 41 through the rotary bearing 44. When the piston 43 moves up and down, the extrusion sleeve 8 will move accordingly.

[0052] The bottom end of the top pressing sleeve shell 41 is fixedly installed with a guide cylinder 45, and the extrusion sleeve 8 and the plug sleeve 9 are rotatably connected inside the guide cylinder 45 and coaxially arranged with the guide cylinder 45. By using the guide cylinder 45, the extrusion sleeve 8 and the plug sleeve 9 can be guided when they move downward.

[0053] It should be noted that the number of rotary bearings 44 is at least two, and the two rotary bearings 44 are fixed on the side wall of the inner cavity 42 by bolts. The two rotary bearings 44 can support the drive shaft 7 and the extrusion sleeve 8 to rotate, respectively, and will not interfere with the rotational movement of the extrusion sleeve 8 when the piston 43 drives the extrusion sleeve 8 to move downward.

[0054] Specifically, when the hydraulic rotary seat 3 needs to drive the top pressing sleeve assembly 4 to move downward, the hydraulic pump 2 is started to provide hydraulic oil above the inner cavity 42, so that the piston 43 moves downward, and when the piston 43 moves downward, the extrusion sleeve 8 will move accordingly, i.e. the plug sleeve 9 can be extruded to provide a downward driving force for the plug sleeve 9 to be screwed into the to-be-connected plate 5.

[0055] It should be further noted that, as shown in Figure 3 The top pressing sleeve shell 41 and the lifting oil cylinder 6 are connected and fixed by a connecting plate, which is convenient for maintaining the integrity of the device and supporting the lifting oil cylinder 6.

[0056] For the technical solution of the present embodiment, as shown in Figure 5 and Figure 6As shown, the drive assembly 1 is provided as a servo motor, the motor output is fixedly connected with the drive shaft 7, the drive shaft 7 is fixedly connected with the protruding keys 71 on both sides of the end away from the motor, and the inner parts of the extrusion sleeve 8 and the plug sleeve 9 are respectively provided with the first key groove 81 and the second key groove 91 matched with the protruding keys 71, the cooperation of the protruding keys 71 and the first key groove 81 and the second key groove 91 can ensure that the drive shaft 7 and the extrusion sleeve 8 and the plug sleeve 9 are firmly connected in the circumferential direction, so that the rotary power output by the motor can be stably and accurately transmitted to the extrusion sleeve 8 and the plug sleeve 9, avoiding the torque transmission failure problem caused by loose connection during high-speed rotation, ensuring the continuity and stability of the welding process, and in the assembly process, the cooperation of the protruding keys 71 and the key grooves can also play a guiding and positioning role, so that the extrusion sleeve 8 and the plug sleeve 9 can be accurately installed along the axial direction of the drive shaft 7, thereby improving the coaxiality and assembly accuracy of the whole device, which helps to reduce the vibration and abnormal wear caused by eccentric rotation of the parts during welding, and further improves the welding quality.

[0057] As shown in Figure 7 and Figure 8 , the extrusion sleeve 8 includes a thick connecting part 82 and a thin connecting part 83, the thick connecting part 82 and the thin connecting part 83 are integrally formed, and a through circular hole is formed in the center of the thick connecting part 82 and the thin connecting part 83, the first key groove 81 is formed on the inner wall of the circular hole at the position of the thin connecting part 83, the thick connecting part 82 and the thin connecting part 83 are integrally formed and a through circular hole is formed in the center, such structure makes the stress of the whole extrusion sleeve 8 more uniform, the thick connecting part 82 can bear larger radial force and axial force, while the thin connecting part 83 can realize precise cooperation with the drive shaft 7 while ensuring strength, during the welding process, when the extrusion sleeve 8 extrudes the plug sleeve 9 downward, the thick connecting part 82 can bear larger reaction force, avoiding deformation or damage of the extrusion sleeve 8 due to local stress concentration, thereby improving the overall strength and stability of the extrusion sleeve 8.

[0058] As shown in Figure 9 and Figure 10As shown, the cock sleeve 9 is provided as a hollow cylinder, the outer side of the cock sleeve 9 is provided with external threads 92, the inner side is provided with internal threads 93, the rotation direction of the external threads 92 and the internal threads 93 is opposite, and the pitch is different, the outer diameter of the cock sleeve 9 is D, and the inner diameter is d, during the welding process, when the extrusion sleeve 8 extrudes the cock sleeve 9 downward, the cock sleeve 9 is gradually extruded out completely until the upper end face coincides with the upper surface of the upper plate 51, at this time, the cock sleeve 9 has been completely separated from the drive shaft 7, and the high-speed rotating motion is lost instantaneously, at the same time, the extrusion sleeve 8 stops extruding, and the cock sleeve 9 is instantaneously stopped inside the upper plate 51 and the lower plate 52, because the cock sleeve 9 is instantaneously stopped, the surface temperature of the to-be-connected plate 5 instantaneously decreases, and the to-be-connected plate 5 will not be excessively softened, which ensures the realization of solid-phase welding, at this time, the internal threads 93 and the external threads 92 of the cock sleeve 9 realize the double connection effect of solid-phase and mechanical threads with the to-be-connected plate 5, and the purpose of high-quality welding is achieved.

[0059] According to the technical scheme of the embodiment, the diameter of the cock sleeve 9 is equal to the diameter of the thin connecting part 83 of the extrusion sleeve 8, and the first key groove 81 and the second key groove 91 are aligned, the diameter of the cock sleeve 9 is equal to the diameter of the thin connecting part 83 of the extrusion sleeve 8, and the key grooves are aligned, so that the protruding keys 71 can be closely matched with the first key groove 81 and the second key groove 91 at the same time, during the rotation process, when the power is transmitted from the motor output end to the extrusion sleeve 8 and the cock sleeve 9 through the drive shaft 7, precise and uniform power transmission can be realized, the rotation speed and torque of the two are consistent, the uneven or lagging power transmission caused by the inconsistent diameter or misaligned key grooves is avoided, the stability and reliability of the welding process are improved, and the aligned key grooves prevent the extrusion sleeve 8 and the cock sleeve 9 from sliding relative to each other during rotation, ensuring the synchronization between them.

[0060] The use principle and process of the present application are as follows:

[0061] When the welding is ready to start, the two kinds of to-be-connected plates 5 are stacked and placed on the jacking oil cylinder 6, then the hydraulic pump 2 provides hydraulic oil to the inside of the jacking oil cylinder 6 and the hydraulic swing base 3, drives the jacking oil cylinder 6 to move upward, and drives the hydraulic swing base 3 to move downward, that is, the to-be-connected plate 5 can be completely extruded and fixed, at this time, the lower end face of the drive shaft 7 and the cock sleeve 9 is completely attached to the surface of the to-be-connected plate 5, wherein the to-be-connected plate 5 includes an upper plate 51 and a lower plate 52, here, the lower end face of the drive shaft 7, the cock sleeve 9 and the upper surface of the upper plate 51 are attached;

[0062] When entering the welding stage, the motor is started to drive the driving shaft 7 to rotate, the driving shaft 7 drives the extrusion sleeve 8 and the plug sleeve 9 to rotate at the same time, and at the same time of rotating, the extrusion sleeve 8 extrudes the plug sleeve 9 downward, forcing the plug sleeve 9 to generate high-speed friction with the to-be-connected plate 5 to generate heat and soften the to-be-connected plate 5, forming solid-phase welding, and the internal thread 93 and the external thread 92 can generate mechanical interlocking effect with the to-be-connected plate 5;

[0063] With the progress of the welding process, the plug sleeve 9 is gradually completely extruded out until the upper end face of the plug sleeve 9 coincides with the upper surface of the upper plate 51, at this time the plug sleeve 9 has completely separated from the driving shaft 7, and in an instant loses high-speed rotating motion, at the same time the extrusion sleeve 8 stops extruding, the plug sleeve 9 is instantaneously stopped inside the to-be-connected plate 5, the internal thread 93 and the external thread 92 realize solid-phase and mechanical thread double connection effect with the to-be-connected plate 5, and the high-quality welding purpose is achieved.

[0064] Embodiment two:

[0065] The embodiment provides a copper-magnesium-aluminum spot welding method, and a copper-magnesium-aluminum spot welding device described in embodiment one is applied, and the method comprises the following steps:

[0066] S1. When starting to prepare welding, first stack two kinds of to-be-connected plates 5 and place them on the lifting oil cylinder 6, then provide hydraulic oil to the inside of the lifting oil cylinder 6 and the hydraulic rotary seat 3 through the hydraulic pump 2, drive the lifting oil cylinder 6 to move upwards, drive the hydraulic rotary seat 3 to drive the pressing sleeve assembly 4 to move downwards, so that the to-be-connected plates 5 are completely extruded and fixed, at this time the lower end face of the driving shaft 7 and the plug sleeve 9 completely coincides with the upper surface of the upper plate 51 in the to-be-connected plate 5;

[0067] S2. When entering the welding stage, the motor is started to drive the driving shaft 7 to rotate, the driving shaft 7 drives the extrusion sleeve 8 and the plug sleeve 9 to rotate at the same time, and at the same time of rotating, the extrusion sleeve 8 extrudes the plug sleeve 9 downward, forcing the plug sleeve 9 to generate high-speed friction with the to-be-connected plate 5 to generate heat and soften the to-be-connected plate 5, forming solid-phase welding;

[0068] S3. With the progress of the welding process, the plug sleeve 9 is gradually completely extruded out until the upper end face of the plug sleeve 9 coincides with the upper surface of the upper plate 51, at this time the plug sleeve 9 has completely separated from the driving shaft 7, and in an instant loses high-speed rotating motion, at the same time the extrusion sleeve 8 stops extruding, the plug sleeve 9 is instantaneously stopped inside the to-be-connected plate 5, the internal thread 93 and the external thread 92 realize solid-phase welding and mechanical interlocking double connection with the to-be-connected plate 5.

[0069] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended that the scope of the application be limited to the detailed description contained herein or the specific examples given herein, but rather that the scope of the application be determined by the appended claims, and their equivalents.

[0070] Those skilled in the art will appreciate that the above described terms are to be construed in accordance with their ordinary meaning in the present invention. When an element is referred to as being "connected", "coupled", "fixed", or "attached" to another element, it can be directly connected, coupled, fixed, or attached to the other element, or intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for descriptive purposes only and not meant to be limiting.

[0071] While embodiments of the application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and variations can be made therein and by those skilled in the art without departing from the spirit and scope of the present application, which is defined by the following claims and their equivalents.

[0072] In the description of the specification, reference can be made to terms such as "one embodiment", "an example", "a specific example", etc. which indicates that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present disclosure. The illustrative appearances of such terms in various places of the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A copper magnesium aluminum spot welding device characterized by, The hydraulic rotary seat (3) is provided with a driving assembly (1) at the top, the output end of the driving assembly (1) is provided with a driving shaft (7), the bottom of the hydraulic rotary seat (3) is fixedly provided with a top pressing sleeve assembly (4), and the driving shaft (7) is rotatably connected inside the hydraulic rotary seat (3) and the top pressing sleeve assembly (4); The bottom of the hydraulic rotary seat (3) is fixedly connected with a jacking oil cylinder (6), and there is a gap between the jacking oil cylinder (6) and the top pressing sleeve assembly (4), and the to-be-connected plate (5) is placed between the jacking oil cylinder (6) and the top pressing sleeve assembly (4); The bottom end outer surface of the driving shaft (7) is provided with an extrusion sleeve (8), the bottom end of the extrusion sleeve (8) is coaxially provided with a plug sleeve (9), the outer side of the plug sleeve (9) is provided with an external thread (92), the inner side is provided with an internal thread (93), the rotation directions of the external thread (92) and the internal thread (93) are opposite, and the pitches are different, and the plug sleeve (9) and the extrusion sleeve (8) can rotate relative to each other. When the driving shaft (7) rotates, the plug sleeve (9) and the extrusion sleeve (8) rotate at the same time, in the rotating process, high-speed friction is generated between the plug sleeve (9) and the to-be-connected plate (5), heat is generated, and the to-be-connected plate (5) is softened, solid-phase welding is formed, and the plug sleeve (9) is rotated into the to-be-connected plate (5) under the action of the downward force of the extrusion sleeve (8).

2. A copper magnesium aluminum spot welding device according to claim 1, characterized in that, Further comprising a hydraulic pump (2), the hydraulic pump (2) is connected with the hydraulic rotary seat (3) and the jacking oil cylinder (6) through oil pipelines and oil return pipelines respectively, and is used for driving the hydraulic rotary seat (3) and the jacking oil cylinder (6) to stretch and shrink at the same time.

3. A copper magnesium aluminum spot welding device according to claim 2, characterized in that: The movement directions of the hydraulic rotary seat (3) and the jacking oil cylinder (6) are always opposite, and the to-be-connected plate (5) is fixed in position.

4. A copper magnesium aluminum spot welding device according to claim 3, characterized in that: The to-be-connected plate (5) comprises an upper plate (51) and a lower plate (52), and the materials of the upper plate (51) and the lower plate (52) are different.

5. A copper magnesium aluminum spot welding device according to claim 4, characterized in that: The top pressing sleeve assembly (4) comprises a top pressing sleeve shell (41) fixedly installed at the bottom of the hydraulic rotary seat (3), an inner cavity (42) is formed between the top pressing sleeve shell (41) and the hydraulic rotary seat (3), a piston (43) is slidably connected inside the inner cavity (42) along the axial direction, the driving shaft (7) is rotatably connected inside the hydraulic rotary seat (3) through a rotary bearing (44), the extrusion sleeve (8) is rotatably connected inside the top pressing sleeve shell (41) through the rotary bearing (44), and the extrusion sleeve (8) moves with the piston (43) when the piston (43) moves up and down; The bottom end of the top pressing sleeve shell (41) is fixedly provided with a guide cylinder (45), and the extrusion sleeve (8) and the plug sleeve (9) are rotatably connected inside the guide cylinder (45) and coaxially arranged.

6. A copper magnesium aluminum spot welding device according to claim 5, characterized in that: The driving assembly (1) is an electric motor, the output end of the electric motor is fixedly connected with the driving shaft (7), the two sides of the end of the driving shaft (7) away from the electric motor are fixedly connected with a key (71), and the inner parts of the extrusion sleeve (8) and the plug sleeve (9) are respectively provided with a first key groove (81) and a second key groove (91) matched with the key (71).

7. A copper magnesium aluminum spot welding device according to claim 6, characterized in that: The extrusion sleeve (8) comprises a thick connecting part (82) and a thin connecting part (83), which are integrally formed, and a through hole is formed in the center of the thick connecting part (82) and the thin connecting part (83), and the first key groove (81) is formed on the inner wall of the through hole at the position of the thin connecting part (83).

8. A copper magnesium aluminum spot welding device according to claim 7, characterized in that: The plug sleeve (9) is provided in a hollow cylindrical shape, and the thermal stability of the plug sleeve (9) is greater than that of the to-be-connected plate (5).

9. A copper magnesium aluminum spot welding device according to claim 8, characterized in that: The diameter of the plug sleeve (9) is equal to the diameter of the thin connecting part (83) of the extrusion sleeve (8), and the first key groove (81) and the second key groove (91) are aligned.

10. A method of spot welding copper magnesium aluminum using a copper magnesium aluminum spot welding apparatus as claimed in claim 9, characterized by, The method comprises the following steps: S1. When preparing to start welding, first stack two different to-be-connected plates (5) on the jacking oil cylinder (6), then provide hydraulic oil to the inside of the jacking oil cylinder (6) and the hydraulic rotary seat (3) through the hydraulic pump (2), drive the jacking oil cylinder (6) to move upwards, drive the hydraulic rotary seat (3) to drive the pressing sleeve assembly (4) to move downwards, so as to completely extrude and fix the to-be-connected plates (5), at this time, the driving shaft (7) and the lower end surface of the plug sleeve (9) are completely attached to the upper surface of the upper plate (51) of the to-be-connected plates (5); S2. When entering the welding stage, start the motor to drive the driving shaft (7) to rotate, which drives the extrusion sleeve (8) and the plug sleeve (9) to rotate at the same time, and at the same time of rotation, the extrusion sleeve (8) extrudes the plug sleeve (9) downwards, forcing the plug sleeve (9) to generate high-speed friction with the to-be-connected plates (5) to heat and soften the to-be-connected plates (5), forming solid-phase welding; S3. With the progress of the welding process, the plug sleeve (9) is gradually completely extruded out until its upper end surface coincides with the upper surface of the upper plate (51), at this time, the plug sleeve (9) has completely separated from the driving shaft (7), and in an instant, the high-speed rotating motion is lost, at the same time, the extrusion sleeve (8) stops extruding, and the plug sleeve (9) is instantaneously stopped inside the to-be-connected plates (5), and the internal thread (93) and the external thread (92) realize solid-phase welding and mechanical interlocking double connection with the to-be-connected plates (5).

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