Welding equipment and welding method for new energy battery tray

Abstract

The invention relates to the technical field of friction stir welding, in particular to new energy battery tray welding equipment and welding method.The new energy battery tray welding equipment comprises a protection box and a sliding groove formed in the inner wall of the protection box, a sliding plate is slidably installed in the sliding groove, and an air cylinder fixedly connected with the sliding plate is fixed to the top of the protection box; the driving assembly is arranged on the protection box, a bearing plate and a welding head are connected to the driving assembly, and the driving assembly can drive the welding head to rotate; the supporting assembly is arranged on the sliding plate and connected with the bearing plate; and the pressure constant mechanism is arranged on the sliding plate and connected with the supporting assembly, and the sliding plate is further provided with a follow-up rotating mechanism connected with the pressure constant mechanism. And downward pressure is constantly provided for the welding head, so that the effect of reducing abrasion of the welding head is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, and in particular to welding equipment and a welding method for a new energy battery tray. Background Art

[0002] Friction stir welding refers to the use of the heat generated by the friction between the high-speed rotating welding tool and the workpiece to partially melt the material to be welded. When the welding tool moves forward along the welding interface, the plasticized material flows from the front to the back of the welding tool under the action of the rotating friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool.

[0003] When welding the battery tray, the welding tool rotates at high speed and moves relative to the workpiece along the joint of the workpiece. The weld is formed under the forging pressure of the stirring head, and finally the metallurgical bonding of the welded workpieces is achieved.

[0004] During existing friction stir welding, a large downward pressure is usually provided to the welding head, and the battery tray is welded directly. However, during this welding method, in the initial stage of contact between the welding head and the battery tray, the heat energy generated by the mutual friction between the two is small. If a large downward pressure is directly provided, it will cause serious wear of the welding head. Summary of the invention

[0005] The purpose of the present invention is to provide a welding device and a welding method for a new energy battery tray to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A welding device for a new energy battery tray, comprising:

[0008] A protection box, and a slide groove provided on the inner wall of the protection box, a sliding plate being slidably installed in the slide groove, and a cylinder fixedly connected to the sliding plate being fixed on the top of the protection box;

[0009] Also includes:

[0010] A driving assembly is arranged on the protection box, a receiving plate and a welding head are connected to the driving assembly, and the driving assembly can drive the welding head to rotate;

[0011] A support assembly, disposed on the sliding plate and connected to the receiving plate, for providing downward pressure to the welding head through the receiving plate;

[0012] A constant pressure mechanism is arranged on the sliding plate and connected to the supporting assembly. A follow-up rotating mechanism connected to the constant pressure mechanism is also arranged on the sliding plate. The constant pressure mechanism can be activated when the supporting assembly moves, and the movement state of the supporting assembly can be adjusted by the follow-up rotating mechanism to keep constant the downward pressure provided by the receiving plate to the welding head.

[0013] As a further solution of the present invention: the driving assembly includes a motor fixedly installed on the top of the protective box, a transmission sleeve connected to the motor output shaft is rotatably installed in the protective box, a rotating rod is slidably engaged in the transmission sleeve, the rotating rod is rotatably connected to the supporting plate and fixedly connected to the welding head.

[0014] As a further solution of the present invention: the support assembly includes a rotating sleeve rotatably installed on the sliding plate and symmetrically arranged, a support rod is slidably installed in the rotating sleeve, the support rod is fixedly connected to the supporting plate, and a first spring is sleeved on the support rod and abuts against the rotating sleeve.

[0015] As a further solution of the present invention: the constant pressure mechanism includes a plurality of guide grooves which are opened on the outer wall of the rotating sleeve and are equidistantly distributed around the circumference, a protruding column and a limiting column which are slidably engaged with the guide grooves are fixed on the support rod, and a guide assembly connected with the limiting column is arranged on the sliding plate.

[0016] As a further solution of the present invention: the guide assembly includes a guide sleeve fixedly mounted on the sliding plate, a guide rod is slidably mounted in the guide sleeve, the guide rod is fixedly connected to the supporting plate, a support rail is fixed on the guide sleeve, and a guide structure connected to the limit column is provided on the support rail.

[0017] As a further solution of the present invention: the guiding structure includes a support plate slidably mounted on the supporting guide rail, a guide groove is provided on the support plate, the guide groove is slidably engaged with the limiting column, a guide rod is rotatably mounted on the support plate and cooperates with the limiting column, a fixed block is fixed on the support plate and cooperates with the guide rod, and a magnetic column is slidably mounted on the support plate and cooperates with the limiting column.

[0018] As a further solution of the present invention: the follow-up rotating mechanism includes a second inclined groove opened on the support plate, a first movable plate slidably mounted on the rotating sleeve and slidably connected to the guide sleeve, a support column is fixed on the first movable plate, the support column is slidably engaged with the second inclined groove, and an elastic component connected to the first movable plate is provided on the rotating sleeve.

[0019] As a further solution of the present invention: the elastic component includes a second movable plate slidably mounted on the guide sleeve, the rotating sleeve is sleeved with a second spring and a third spring, the two ends of the second spring are respectively abutted against the first movable plate and the second movable plate, the third spring is abutted against the second movable plate, and the rotating sleeve is provided with a driven structure connected to the second movable plate.

[0020] As a further solution of the present invention: the driven structure includes a spiral groove opened on the outer wall of the rotating sleeve, a movable sleeve fixedly connected to the second movable plate is slidably mounted on the rotating sleeve, and a limit block slidably engaged with the spiral groove is fixed on the inner wall of the movable sleeve.

[0021] A welding method for a new energy battery tray comprises the following steps:

[0022] Step 1: Extrude the aluminum profile so that the profile wall thickness is ≥0.5mm and the solid area width of the stir friction weld is ≥6mm;

[0023] Step 2: According to the specific part size, the raw aluminum profile is machined, and the reference positioning surface is machined on the frame profile. The spindle speed is calculated according to the cutting speed and tool diameter. Oil mist or alcohol cooling is used during the processing;

[0024] Step 3: Use ultrasonic cleaning to remove oil stains and aluminum chips on the surface of the profile and in the cavity. The cleaning temperature is 40-80℃, the cleaning time is 2-10min, the ultrasonic frequency is 10-100kHz, and the ultrasonic power density is 0.2-1.0W / cm 2 , the cleaning agent should be a special aluminum profile cleaning agent;

[0025] Step 4: Place the cleaned bottom plate aluminum profile and frame aluminum profile on the automated tooling in sequence according to the position of the whole set of combinations, and use the cylinder or oil cylinder to automatically press / tighten the bottom plate aluminum profile / frame at the weld position. The robot will follow the welding trajectory program to spot-fasten the bottom plate aluminum profile and the frame to the bottom plate aluminum profile, and perform vertical seam welding between the surrounding frames.

[0026] Step 5: Place the battery tray on the double-sided friction stir welding automated tooling, use a pneumatic cylinder or oil cylinder to automatically press / position it, first perform double-sided friction stir welding on the bottom plate welds, then perform double-sided friction stir welding on a circle of frame welds, and automatically fill the bottom plate tail holes left on the frame welds during the welding of the frame welds;

[0027] Step 6: Use automated machinery or manual grinding to remove the burrs left on both sides of the weld.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application can gradually increase the downward pressure of the welding head, and when the downward pressure of the welding head reaches a certain value, maintain a constant downward pressure on the welding head to reduce the wear of the welding head. When the battery tray needs to be stir friction welded, at this time, under the action of the cylinder, the movement of the welding head is controlled, and under the action of the driving assembly, the welding head is rotated. When the welding head is in contact with the battery tray, since the downward pressure of the welding head is small at this time, and the heat energy generated by the friction with the battery tray is small, the position of the welding head no longer changes. At this time, under the action of the constant pressure mechanism, the downward pressure on the welding head is gradually increased until the welding head is screwed into the battery tray. Under the action of the follow-up rotating mechanism, the position of the constant pressure mechanism is controlled to no longer change, so as to keep the downward pressure of the welding head constant, thereby ensuring that the wear of the welding head is reduced while ensuring the best welding quality of the battery tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural schematic diagram of an embodiment of welding equipment for a new energy battery tray.

[0030] Figure 2 A schematic diagram of the half-section structure of a protective box in one embodiment of welding equipment for a new energy battery tray.

[0031] Figure 3 for Figure 2 Schematic diagram of the structure from another angle.

[0032] Figure 4 A schematic diagram of the connection relationship among a driving assembly, a supporting assembly, a partial follow-up rotating mechanism, and a partial constant pressure mechanism in one embodiment of a welding device for a new energy battery tray.

[0033] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at point A in the middle.

[0034] Figure 6 A schematic diagram of the connection relationship among a follow-up rotating mechanism, a partial constant pressure mechanism, and a supporting assembly in one embodiment of a welding device for a new energy battery tray.

[0035] Figure 7 This is a structural schematic diagram of a partial pressure constant mechanism in an embodiment of a welding device for a new energy battery tray.

[0036] Figure 8 This is a structural schematic diagram of a partial follow-up rotating mechanism and a partial constant pressure mechanism in an embodiment of a welding device for a new energy battery tray.

[0037] Fig. 9 This is a schematic diagram of the exploded structure of part of the follow-up rotating mechanism and part of the constant pressure mechanism in an embodiment of the welding equipment for the new energy battery tray.

[0038] Fig.10 This is a schematic diagram of a partial half-section structure of an embodiment of a welding device for a new energy battery tray.

[0039] In the figure: 1, protective box; 101, slide groove; 2, sliding plate; 3, cylinder; 4, motor; 5, transmission sleeve; 6, rotating rod; 7, welding head; 8, rotating sleeve; 801, vertical groove; 802, arc groove; 803, annular groove; 804, spiral groove; 9, support rod; 10, guide sleeve; 11, guide rod; 12, first spring; 13, protruding column; 14, limiting column; 15, first movable plate; 16, support column; 17, second spring; 18, movable sleeve; 19, limiting block; 20, second movable plate; 21, third spring; 22, support rail; 23, support plate; 2301, first straight groove; 2302, first inclined groove; 2303, second straight groove; 2304, horizontal groove; 24, second inclined groove; 25, guide rod; 26, fixed block; 27, receiving plate; 28, magnetic column. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0042] See also Figures 1 to 10 In an embodiment of the present invention, a welding device for a new energy battery tray includes:

[0043] A protection box 1, and a slide groove 101 provided on the inner wall of the protection box 1, a sliding plate 2 is slidably installed in the slide groove 101, and a cylinder 3 fixedly connected to the sliding plate 2 is fixed on the top of the protection box 1;

[0044] Among them, the protective box 1 is installed on the automated tooling for double-sided friction stir welding, and two protective boxes 1 are symmetrically arranged. When welding the battery tray, the battery tray can be placed between the two protective boxes 1, and the battery tray can be automatically pressed and positioned by the oil cylinder to ensure the smooth subsequent double-sided synchronous welding of the battery tray.

[0045] Also includes:

[0046] See also Figure 1-Figure 4 , a driving assembly is arranged on the protective box 1, and a receiving plate 27 and a welding head 7 are connected to the driving assembly. The driving assembly can drive the welding head 7 to rotate. The driving assembly includes a motor 4 fixedly installed on the top of the protective box 1, and a transmission sleeve 5 connected to the output shaft of the motor 4 is rotatably installed in the protective box 1. A rotating rod 6 is slidably engaged in the transmission sleeve 5, and the rotating rod 6 is rotatably connected to the receiving plate 27 and fixedly connected to the welding head 7.

[0047] In detail, after the battery tray is fixed by the oil cylinder, it is located between the two welding heads 7. In the initial state, under the action of the cylinder 3, the receiving plate 27 is located at the end of the stroke toward the protective box 1. When the battery tray needs to be welded, at this time, the motor 4 works and drives the transmission sleeve 5 to rotate, thereby driving the rotating rod 6 to rotate, and the rotating rod 6 will drive the welding head 7 to rotate. At the same time, the cylinder 3 works and pushes the sliding plate 2 to move along the length direction of the slide groove 101, thereby driving the receiving plate 27 to move synchronously through the support assembly. The receiving plate 27 will also drive the welding head 7 to move toward the battery tray through the rotating rod 6 until the welding head 7 abuts against the welding position of the battery tray. Under the action of the welding head 7, the weld is welded. Among them, through the double-sided welding method, the two welding heads 7 can be rotated at high speed and generate heat, which is equivalent to having two symmetrical heat sources on the upper and lower surfaces of the weld, and these two heat sources serve as auxiliary heat sources of another heat source. Therefore, double-sided welding can achieve more concentrated heat input and higher welding speed, which is effective in improving efficiency and reducing costs.

[0048] Preferably, when the upper and lower welding heads 7 are welded, the forging forces generated offset each other, the temperature field is evenly distributed in the thickness direction of the weld, the deformation of the parts after welding is small, the weld performance is high, and after stir friction welding, there is no tail hole in the weld, eliminating the process of fusion welding to fill the tail hole, reducing production costs and the risk of tail hole leakage, and double-sided stir friction welding processes the profile in place, avoiding the machining of the base plate after stir friction welding in the traditional process, reducing the waste of raw materials for aluminum profiles, and reducing production costs.

[0049] See also Figure 2-Figure 4 , Figure 6 , Figure 8-Figure 10, a support assembly is arranged on the sliding plate 2 and connected to the receiving plate 27, and is used to provide downward pressure to the welding head 7 through the receiving plate 27. The support assembly includes a rotating sleeve 8 rotatably mounted on the sliding plate 2 and symmetrically arranged, and a support rod 9 is slidably mounted in the rotating sleeve 8. The support rod 9 is fixedly connected to the receiving plate 27, and a first spring 12 abutting against the rotating sleeve 8 is sleeved on the support rod 9.

[0050] It should be noted that, in the initial state, the first spring 12 is in a compressed state. Under the action of the constant pressure mechanism, the support rod 9 is located at the end of the stroke away from the rotating sleeve 8, so that the receiving plate 27 provides a certain downward pressure to the welding head 7. When the battery tray needs to be welded, under the action of the cylinder 3, the sliding plate 2 is driven to move toward the battery tray, thereby driving the rotating sleeve 8 to move. The rotating sleeve 8 will drive the support rod 9 to move synchronously through the first spring 12, thereby driving the welding head 7 to move through the receiving plate 27. When the welding head 7 moves to the position abutting the battery tray, the friction time between the welding head 7 and the battery tray is relatively small at this time, and the welding head 7 is subjected to downward pressure. The force is small, so the welding head 7 will rotate on the welding surface of the battery tray. At this time, the sliding plate 2 continues to move, so that the size of the fit between the rotating sleeve 8 and the support rod 9 gradually increases, and gradually compresses the first spring 12. The downward pressure provided by the first spring 12 to the welding head 7 gradually increases until the heat source and downward pressure generated by the rotation of the welding head 7 are sufficient. The welding head 7 will be screwed into the battery tray. When the welding head 7 reaches the required penetration depth, under the action of the pressure constant mechanism, the pressure on the welding head 7 is ensured to be constant, and the penetration depth of the welding head 7 no longer changes. At this time, under the action of the automated tooling, the welding head 7 is controlled to move along the trajectory of the weld to perform double-sided friction stir welding on the battery tray.

[0051] Preferably, since the downward pressure on the welding head 7 is relatively small in the initial state, when the heat source generated by the rotation of the welding head 7 is relatively small, the welding head 7 will stay on the surface of the battery tray until the welding temperature reaches the required requirements and the downward pressure reaches the required requirements. Then the welding head 7 will be rotated into the weld, thereby gradually heating up the surface of the battery tray and avoiding the problem of severe wear of the welding head 7 due to excessive initial pressure.

[0052] See also Figure 2-Figure 10, a constant pressure mechanism is arranged on the sliding plate 2 and connected to the support assembly, the constant pressure mechanism includes a plurality of guide grooves opened on the outer wall of the rotating sleeve 8 and distributed equidistantly around the circumference, a protruding column 13 and a limiting column 14 are fixed on the support rod 9 and are slidably engaged with the guide grooves, and a guide assembly connected to the limiting column 14 is arranged on the sliding plate 2, wherein the guide assembly includes a guide sleeve 10 fixedly mounted on the sliding plate 2, a guide rod 11 is slidably mounted in the guide sleeve 10, and the guide rod 11 is fixedly connected to the receiving plate 27, and the guide A support rail 22 is fixed on the sleeve 10, and a guide structure connected to the limit column 14 is provided on the support rail 22. The guide structure mentioned above includes a support plate 23 slidably mounted on the support rail 22, and a guide groove is provided on the support plate 23. The guide groove is slidably engaged with the limit column 14, and a guide rod 25 cooperating with the limit column 14 is rotatably mounted on the support plate 23. A fixed block 26 that contacts and cooperates with the guide rod 25 is fixed on the support plate 23, and a magnetic column 28 cooperating with the limit column 14 is slidably mounted on the support plate 23.

[0053] Further, there are two guide grooves equidistantly distributed on the circumference, and the guide grooves can be divided into multiple sections, namely, a vertical groove 801, an arc groove 802, and an annular groove 803. The annular groove 803 and the arc groove 802 are connected to the middle position of the vertical groove 801. The guide groove is also divided into multiple sections, namely, a first straight groove 2301, a first oblique groove 2302, a second straight groove 2303, and a transverse groove 2304. The two ends of the second straight groove 2303 are respectively connected to one end of the first oblique groove 2302 and the transverse groove 2304, and the middle position of the first straight groove 2301 is connected to the other end of the first oblique groove 2302 and the transverse groove 2304. The guide rod 25 is sleeved with There is a torsion spring, under the action of the torsion spring, the guide rod 25 is abutted against the fixed block 26. In the initial state, under the action of the first spring 12, the support rod 9 is located at the end of the stroke away from the rotating sleeve 8, so that the protruding column 13 and the limiting column 14 are divided into the end of the stroke located on the side of the two vertical grooves 801 facing the receiving plate 27, and the limiting column 14 is located at the end of the stroke of the first straight groove 2301 facing the receiving plate 27. When it is necessary to weld the battery tray, at this time, under the action of the cylinder 3, the welding head 7 moves toward the direction of the battery tray. When the welding head 7 moves to a position that fits the surface of the battery tray, the welding head 7 is The downward pressure on the joint 7 is small, and the heat generated by the friction between the battery tray and the welding head 7 is also small. Therefore, the welding head 7 will not move. At this time, the rotating sleeve 8 continues to move, so that the limiting column 14 and the protruding column 13 move along the length direction of the vertical groove 801, and the limiting column 14 will also move along the length direction of the first straight groove 2301. At the same time, the rotating sleeve 8 will also compress the first spring 12, so that the downward pressure on the welding head 7 gradually increases. When the protruding column 13 passes over the arc groove 802 and the annular groove 803, the limiting column 14 will move to abut against one side of the guide rod 25, so that the guide rod 25 and the welding head 7 will be in contact with each other. The fixing block 26 is separated, and the guide rod 25 will not interfere with the movement of the limiting column 14 in the first straight slot 2301. When the limiting column 14 is separated from the guide rod 25, the guide rod 25 is reset under the action of the torsion spring. When the protruding column 13 moves to the end of the stroke on the other side of the vertical slot 801, the limiting column 14 also moves to the end of the stroke on the other side of the first straight slot 2301. At this time, the cylinder 3 stops moving, and the downward pressure provided to the welding head 7 by the first spring 12 reaches the maximum. During the process, the welding head 7 continues to rub against the battery tray. Under the action of the downward pressure, the welding head 7 gradually rotates into the battery tray and performs friction welding.

[0054] Preferably, as the downward pressure of the welding head 7 and the surface temperature of the battery tray increase, the elastic potential energy of the first spring 12 is gradually released, and drives the support rod 9 to move in a direction away from the rotating sleeve 8, so that the limiting column 14 and the protruding column 13 move toward the initial position. When the limiting column 14 moves to abut against the other side of the guide rod 25, under the action of the fixing block 26, the guide rod 25 will guide the limiting column 14 to enter the first inclined groove 2302, thereby controlling the support plate 23 to move along the length direction of the support guide rail 22. The support plate 23 will also drive the follow-up rotating mechanism to move, so that the rotating sleeve 8 has a tendency to rotate. Since the protruding column 13 is still in the vertical groove 801, the rotating sleeve 8 cannot rotate. When the protruding column 13 moves to the position where the vertical groove 801 is connected to the arc groove 802, the rotating sleeve 8 will rotate, so that the protruding column 13 enters the arc groove 802. When the limiting column 14 breaks away from the first inclined groove 2302 and enters the connection position of the second straight groove 2303 and the transverse groove 2304 through the second straight groove 2303, the limiting column 14 will abut against the magnetic column 28. Under the action of the magnetic column 28, the limiting column 14 will not break away from the connection point of the second straight groove 2303 and the transverse groove 2304. At this time, under the action of the follow-up rotating mechanism, the protruding column 13 enters the end of the stroke of the annular groove 803. Under the action of the annular groove 803 and the protruding column 13, the size of the rotating sleeve 8 and the support rod 9 is no longer changed, so as to ensure that the elastic potential energy of the first spring 12 does not change, so that the downward pressure on the welding head 7 is constant. At this time, if it is necessary to continue to increase the depth of penetration, the movement of the welding head 7 can be continued to be controlled by the cylinder 3 until the welding head 7 reaches the required depth of penetration.

[0055] Among them, an electromagnetic structure is also provided on the support plate 23. When the welding of the welding head 7 is completed, under the action of the cylinder 3, the welding head 7 is controlled to move toward the initial position. At this time, the support rod 9 needs to be unlocked, the electromagnetic structure is energized, and a magnetic force is generated. Under the action of the magnetic force, an attraction force is generated on the magnetic column 28 to drive the magnetic column 28 to move in a direction away from the receiving plate 27. When the magnetic column 28 moves to a position separated from the limiting column 14, at this time, under the action of the follow-up rotating mechanism, the support plate 23 moves toward the initial position, so that the limiting column 14 moves along the length direction of the horizontal groove 2304. The follow-up rotating mechanism also controls the rotating sleeve 8 to rotate so that the protruding column 13 moves toward the vertical groove 801 Directional movement, when the limiting column 14 disengages from the horizontal groove 2304 and enters the first straight groove 2301, the protruding column 13 also disengages from the annular groove 803 and enters the vertical groove 801. At this time, the first spring 12 is elastically released and drives the support rod 9 to move in the direction away from the rotating sleeve 8 until the protruding column 13 returns to the end of the stroke on the side of the vertical groove 801 toward the receiving plate 27. At this time, the electromagnetic structure is powered off, and under the action of gravity, the magnetic suction column 28 returns to the initial position, and by gradually increasing the compression of the first spring 12, the downward pressure on the welding head 7 is gradually increased to prevent the welding head 7 from being worn too seriously when the friction temperature between the welding head 7 and the battery tray is low.

[0056] See also Figure 2-Figure 4 , Figure 6 , Figure 8-Figure 10, the sliding plate 2 is also provided with a follow-up rotating mechanism connected to the constant pressure mechanism, the constant pressure mechanism can be activated when the support assembly moves, and the movement state of the support assembly is adjusted by the follow-up rotating mechanism to keep the downward pressure provided by the receiving plate 27 to the welding head 7 constant, the follow-up rotating mechanism includes a second inclined groove 24 provided on the support plate 23, a first movable plate 15 slidably connected to the guide sleeve 10 is slidably mounted on the rotating sleeve 8, a support column 16 is fixed on the first movable plate 15, and the support column 16 is slidably engaged with the second inclined groove 24, and an elastic component connected to the first movable plate 15 is provided on the rotating sleeve 8, wherein the The elastic component includes a second movable plate 20 slidably mounted on the guide sleeve 10, a second spring 17 and a third spring 21 are sleeved on the rotating sleeve 8, the two ends of the second spring 17 are respectively abutted against the first movable plate 15 and the second movable plate 20, the third spring 21 is abutted against the second movable plate 20, and a driven structure connected to the second movable plate 20 is provided on the rotating sleeve 8. The driven structure mentioned above includes a spiral groove 804 opened on the outer wall of the rotating sleeve 8, and a movable sleeve 18 fixedly connected to the second movable plate 20 is slidably mounted on the rotating sleeve 8, and a limit block 19 slidably engaged with the spiral groove 804 is fixed on the inner wall of the movable sleeve 18.

[0057] Furthermore, in the initial state, the second spring 17 and the third spring 21 are in a compressed state, and the elastic potential energy of the third spring 21 is greater than the elastic potential energy of the second spring 17. Under the action of the second spring 17 and the third spring 21, the second movable plate 20 and the first movable plate 15 are located at the end of the stroke away from the sliding plate 2. The first movable plate 15 will also control the support column 16 to be located at the end of the stroke on one side of the second inclined groove 24. When the battery tray needs to be welded, at this time, under the action of the cylinder 3, the welding head 7 is controlled to move toward the battery tray. When the welding head 7 is in contact with the battery tray, the support rod 9 will move toward the rotating sleeve 8. When the downward pressure of the welding head 7 and the heat energy generated by friction are sufficient, the support rod 9 will move in the direction away from the rotating sleeve 8, and when the limit column 14 moves into the first inclined groove 2302, the support plate 23 will move along the support guide The rail 22 moves in the length direction. Under the action of the second inclined groove 24 and the support column 16, the first movable plate 15 moves toward the sliding plate 2 and compresses the second spring 17. The elastic potential energy of the second spring 17 will gradually increase until the elastic potential energy of the second spring 17 is greater than the elastic potential energy of the third spring 21. Since the protruding column 13 is still in the vertical groove 801 at this time, the rotating sleeve 8 will not rotate, and the second movable plate 20 has a tendency to move toward the sliding plate 2. When the protruding column 13 moves to the position of the arc groove 802, the second movable plate 20 will move toward the sliding plate 2 to drive the limit block 19 to slide along the spiral groove 804 through the movable sleeve 18. At this time, the rotating sleeve 8 rotates until the protruding column 13 enters the annular groove 803, and the size of the support rod 9 and the rotating sleeve 8 no longer changes, so that the downward pressure on the welding head 7 is constant.

[0058] Preferably, when it is necessary to unlock the welding head 7, under the action of magnetic force, the magnetic suction column 28 is separated from the limit column 14, the second spring 17 and the third spring 21 are elastically released, so that the first movable plate 15 and the second movable plate 20 move toward the initial position, and the support plate 23 is reset by controlling the support column 16 and the second inclined groove 24 to make the limit column 14 return to the first straight groove 2301, and the first spring 12 is elastically released, so that the support rod 9 moves in the direction away from the rotating sleeve 8 until the protruding column 13 returns to the end of the stroke on one side of the vertical groove 801.

[0059] A welding method for a new energy battery tray comprises the following steps:

[0060] Step 1: Extrude the aluminum profile so that the profile wall thickness is ≥0.5mm and the solid area width of the stir friction weld is ≥6mm;

[0061] Step 2: According to the specific part size, the raw aluminum profile is machined, and the reference positioning surface is machined on the frame profile. The spindle speed is calculated according to the cutting speed and tool diameter. Oil mist or alcohol cooling is used during the processing;

[0062] Step 3: Use ultrasonic cleaning to remove oil stains and aluminum chips on the surface of the profile and in the cavity. The cleaning temperature is 40-80℃, the cleaning time is 2-10min, the ultrasonic frequency is 10-100kHz, and the ultrasonic power density is 0.2-1.0W / cm 2 , the cleaning agent should be a special aluminum profile cleaning agent;

[0063] Step 4: Place the cleaned bottom plate aluminum profile and frame aluminum profile on the automated tooling in sequence according to the position of the whole set of combinations, and use the cylinder or oil cylinder to automatically press / tighten the bottom plate aluminum profile / frame at the weld position. The robot will follow the welding trajectory program to spot-fasten the bottom plate aluminum profile and the frame to the bottom plate aluminum profile, and perform vertical seam welding between the surrounding frames.

[0064] Step 5: Place the battery tray on the double-sided friction stir welding automated tooling, use a pneumatic cylinder or oil cylinder to automatically press / position it, first perform double-sided friction stir welding on the bottom plate welds, then perform double-sided friction stir welding on a circle of frame welds, and automatically fill the bottom plate tail holes left on the frame welds during the welding of the frame welds;

[0065] Step 6: Use automated machinery or manual grinding to remove the burrs left on both sides of the weld.

[0066] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0067] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A welding device for a new energy battery tray, comprising: A protection box (1), and a slide groove (101) provided on the inner wall of the protection box (1), a sliding plate (2) being slidably mounted in the slide groove (101), and a cylinder (3) fixedly connected to the sliding plate (2) being fixed on the top of the protection box (1); It is characterized by further comprising: A driving assembly is arranged on the protection box (1), a receiving plate (27) and a welding head (7) are connected to the driving assembly, and the driving assembly can drive the welding head (7) to rotate; A support assembly, arranged on the sliding plate (2) and connected to the receiving plate (27), and used for providing downward pressure to the welding head (7) through the receiving plate (27); A constant pressure mechanism is arranged on the sliding plate (2) and connected to the supporting assembly. The sliding plate (2) is also provided with a follow-up rotating mechanism connected to the constant pressure mechanism. The constant pressure mechanism can be activated when the supporting assembly moves, and the movement state of the supporting assembly can be adjusted by the follow-up rotating mechanism to keep constant the downward pressure provided by the receiving plate (27) to the welding head (7).

2. The welding equipment for a new energy battery tray according to claim 1 is characterized in that: The driving assembly comprises a motor (4) fixedly mounted on the top of the protective box (1), a transmission sleeve (5) connected to the output shaft of the motor (4) being rotatably mounted in the protective box (1), a rotating rod (6) being slidably engaged in the transmission sleeve (5), the rotating rod (6) being rotatably connected to the receiving plate (27) and fixedly connected to the welding head (7).

3. The welding equipment for a new energy battery tray according to claim 1 is characterized in that: The support assembly comprises a rotating sleeve (8) rotatably mounted on the sliding plate (2) and arranged symmetrically, a support rod (9) being slidably mounted in the rotating sleeve (8), the support rod (9) being fixedly connected to the receiving plate (27), and a first spring (12) being sleeved on the support rod (9) and abutting against the rotating sleeve (8).

4. The welding equipment for a new energy battery tray according to claim 3 is characterized in that: The pressure constant mechanism comprises a plurality of guide grooves which are arranged on the outer wall of the rotating sleeve (8) and are equidistantly distributed around the circumference; a protruding column (13) and a limiting column (14) which are slidably engaged with the guide grooves are fixed on the support rod (9); and a guide assembly which is connected to the limiting column (14) is arranged on the sliding plate (2).

5. The welding equipment for a new energy battery tray according to claim 4 is characterized in that: The guide assembly comprises a guide sleeve (10) fixedly mounted on the sliding plate (2), a guide rod (11) being slidably mounted in the guide sleeve (10), the guide rod (11) being fixedly connected to the receiving plate (27), a support rail (22) being fixed on the guide sleeve (10), and a guide structure connected to the limit column (14) being provided on the support rail (22).

6. The welding equipment for a new energy battery tray according to claim 5 is characterized in that: The guide structure comprises a support plate (23) slidably mounted on the support rail (22); a guide groove is provided on the support plate (23); the guide groove is slidably engaged with the limit column (14); a guide rod (25) is rotatably mounted on the support plate (23) and cooperates with the limit column (14); a fixed block (26) is fixed on the support plate (23) and cooperates with the guide rod (25); and a magnetic column (28) is slidably mounted on the support plate (23) and cooperates with the limit column (14).

7. The welding equipment for a new energy battery tray according to claim 6 is characterized in that: The follow-up rotating mechanism comprises a second inclined groove (24) provided on the support plate (23); a first movable plate (15) slidably mounted on the rotating sleeve (8) and slidably connected to the guide sleeve (10); a supporting column (16) is fixed on the first movable plate (15); the supporting column (16) is slidably engaged with the second inclined groove (24); and an elastic component connected to the first movable plate (15) is provided on the rotating sleeve (8).

8. The welding equipment for a new energy battery tray according to claim 7 is characterized in that: The elastic component comprises a second movable plate (20) slidably mounted on the guide sleeve (10); a second spring (17) and a third spring (21) are sleeved on the rotating sleeve (8); two ends of the second spring (17) are respectively in contact with the first movable plate (15) and the second movable plate (20); the third spring (21) is in contact with the second movable plate (20); and a driven structure connected to the second movable plate (20) is provided on the rotating sleeve (8).

9. The welding equipment for a new energy battery tray according to claim 8 is characterized in that: The driven structure comprises a spiral groove (804) provided on the outer wall of the rotating sleeve (8), a movable sleeve (18) fixedly connected to the second movable plate (20) is slidably mounted on the rotating sleeve (8), and a limit block (19) slidably engaged with the spiral groove (804) is fixed on the inner wall of the movable sleeve (18).

10. A welding method for a new energy battery tray, using the welding device for a new energy battery tray as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Extrude the aluminum profile so that the profile wall thickness is ≥0.5mm and the solid area width of the stir friction weld is ≥6mm; Step 2: According to the specific part size, the raw aluminum profile is machined, and the reference positioning surface is machined on the frame profile. The spindle speed is calculated according to the cutting speed and tool diameter. Oil mist or alcohol cooling is used during the processing; Step 3: Use ultrasonic cleaning to remove oil stains and aluminum chips on the surface of the profile and in the cavity. The cleaning temperature is 40-80℃, the cleaning time is 2-10min, the ultrasonic frequency is 10-100kHz, and the ultrasonic power density is 0.2-1.0W / cm 2 , the cleaning agent should be a special aluminum profile cleaning agent; Step 4: Place the cleaned bottom plate aluminum profile and frame aluminum profile on the automated tooling in sequence according to the position of the whole set of combinations, and use the cylinder or oil cylinder to automatically press / tighten the bottom plate aluminum profile / frame at the weld position. The robot will follow the welding trajectory program to spot-fasten the bottom plate aluminum profile and the frame to the bottom plate aluminum profile, and perform vertical seam welding between the surrounding frames. Step 5: Place the battery tray on the double-sided friction stir welding automated tooling, use a pneumatic cylinder or oil cylinder to automatically press / position it, first perform double-sided friction stir welding on the bottom plate welds, then perform double-sided friction stir welding on a circle of frame welds, and automatically fill the bottom plate tail holes left on the frame welds during the welding of the frame welds; Step 6: Use automated machinery or manual grinding to remove the burrs left on both sides of the weld.

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