Brazing equipment and welding methods

Abstract

This application relates to the field of welding technology, and in particular to a brazing apparatus and welding method. The brazing apparatus includes: a welding mechanism, including a first limiting part for placing a first workpiece to be welded; a feeding mechanism for placing a second workpiece to be welded and a welded part; a supporting member disposed on the side of the feeding mechanism and the welding mechanism, with the feeding mechanism and the welding mechanism spaced apart along the length of the supporting member; and a transfer member movably disposed on the supporting member, the transfer member being used to pick up or release the second workpiece to be welded and the welded part, and capable of transferring the second workpiece to be welded to a position directly above the first workpiece to be welded; after the transfer member releases the second workpiece to be welded, the second workpiece to be welded can coaxially enter the first workpiece to be welded. The brazing apparatus provided by this application can significantly improve the assembly accuracy of the first and second workpieces to be welded, thereby improving the uniformity of the circumferential seam between them, reducing the porosity at the welding position, and improving the welding quality.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a brazing device and welding method. Background Technology

[0002] With the rapid development of modern industrial technology, traditional single-material systems are no longer sufficient to meet the diversified needs of high-end applications such as electronic communication, power transmission, and aerospace technology. Against this backdrop, research on multi-metal composite joining technology is particularly important. Effectively combining metal materials with different properties can fully leverage the performance advantages of each component, achieving complementary and synergistic effects. Especially with the increasing demands for structural performance, lightweighting, and functional integration in fields such as aerospace, new energy vehicles, precision instruments, and nuclear energy devices, dissimilar material joining technology has evolved from an auxiliary and special processing technique into a core component of high-end equipment research and manufacturing.

[0003] As a crucial method for joining dissimilar metals, induction brazing offers significant advantages, including rapid localized heating, precise and controllable heat input, a narrow heat-affected zone, ease of automation, and minimal overall thermal damage to the workpiece. Induction brazing involves inducing eddy currents in the workpiece within an alternating magnetic field, generating heat to melt a filler metal with a specific melting point (while the base material remains unmelted) to achieve a connection. This process effectively mitigates residual stress and deformation problems caused by mismatches in the thermal expansion coefficients and thermal conductivity of dissimilar materials, making it particularly suitable for precision, thin-walled, or high-cost components requiring subsequent processing. However, existing brazing equipment struggles to effectively control the uniformity of the circumferential weld between the two parts, easily leading to uneven welds and affecting overall weld quality. Summary of the Invention

[0004] The purpose of this application is to provide a brazing device and a welding method, so as to solve to a certain extent the technical problem that existing brazing devices are unable to effectively control the uniformity of the circumferential seam between two welded parts, which easily leads to uneven circumferential seam and affects the welding quality.

[0005] This application provides a brazing apparatus, comprising: A welding mechanism, the welding mechanism including a first limiting part for placing a first workpiece to be welded; A feeding mechanism for placing a second workpiece to be welded and a welded part that has been welded; A supporting member is provided on the side of the feeding mechanism and the welding mechanism, and the feeding mechanism and the welding mechanism are spaced apart along the length direction of the supporting member; A transfer member is movably disposed on the support member, the transfer member being used to pick up or release the second workpiece to be welded and the weldment; the transfer member is capable of transferring the second workpiece to be welded to a position directly above the first workpiece to be welded; After the transfer member moves to directly above the first workpiece to be welded and releases the second workpiece to be welded, the second workpiece to be welded can enter the first workpiece to be welded, and the second workpiece to be welded and the first workpiece to be welded are coaxially arranged.

[0006] In the above technical solution, the transfer member has a first working position, a second working position and a third working position on the support member relative to the support member, and the transfer member can switch positions between the first working position, the second working position and the third working position; The first working position is located directly above the first limiting part. The feeding mechanism includes a positioning part for placing the second workpiece to be welded and a second limiting part for placing the welded part. The second working position is located directly above the positioning part, and the third working position is located directly above the second limiting part. In any of the above technical solutions, the supporting member further includes: support; A sliding module is disposed on the bracket, and the length of the sliding module extends along a first direction; A lifting module is slidably connected to a sliding module, and the length of the lifting module extends along a third direction different from the first direction; the transfer member is slidably disposed on the lifting module.

[0007] In any of the above technical solutions, the transfer component further includes a magnetic clamp, which is columnar, and in the first working position, the axis of the magnetic clamp is collinear with the axis of the second workpiece to be welded; In the second working position, the axis of the magnetic clamp is collinear with the axis of the first workpiece to be welded.

[0008] In any of the above technical solutions, the welding mechanism further includes: Fixed base; A working platform is mounted on the fixed base; a first limiting part is mounted on the working platform. An induction heating assembly is disposed on the side of the working platform; the induction heating assembly includes an induction heating power supply and an induction coil, the induction coil being connected to the induction heating power supply and surrounding the first workpiece to be welded; A rotary lifting assembly is mounted on the fixed base and connected to the work platform.

[0009] In any of the above technical solutions, the welding mechanism further includes a vibration device, which acts on the working platform to cause the working platform to drive the first workpiece to be welded and the second workpiece to be welded to vibrate.

[0010] In any of the above technical solutions, the brazing equipment further includes: A gas protection assembly, comprising: a protective cover and a gas supply device, wherein the protective cover is connected to the gas supply device; the protective cover is detachably disposed on the first limiting portion; A dust removal assembly, comprising: a suction head and a suction device, wherein the suction head is connected to the suction device and is positioned facing the work platform.

[0011] In any of the above technical solutions, the feeding mechanism further includes: The base is provided with a support platform; A first supporting member is movably disposed on the supporting platform along a second direction; the positioning part is disposed on the first supporting member; The second load-bearing member is movably disposed on the load-bearing platform along the second direction. This application also provides a welding method applicable to the brazing equipment described in any of the above technical solutions, and thus possesses all the beneficial technical effects of the brazing equipment, which will not be elaborated here.

[0012] The welding method includes the following steps: S100, Loading; The first workpiece to be welded is placed in the first limiting part of the welding mechanism, and the second workpiece to be welded is placed in the positioning part of the feeding mechanism; S200, workpiece assembly; the transfer member transfers the second workpiece to be welded to a position directly above the first workpiece to be welded, and the transfer member releases the second workpiece to be welded, so that the second workpiece to be welded falls into the first workpiece to be welded in an attitude coaxial with the first workpiece to be welded; A concentric circumferential seam is formed between the first workpiece to be welded and the second workpiece to be welded, and brazing filler metal is disposed within the concentric circumferential seam; S300, Coupling brazing; Perform welding operation on the assembled first workpiece to be welded and the second workpiece to be welded; S400, Unloading; After welding is completed, the transfer component transfers the first workpiece to be welded and the second workpiece to be welded together to the feeding mechanism.

[0013] In the above technical solution, step S300 further includes: S301. Atmosphere setup: Introduce shielding gas into the welding cavity; S302, Heating and Vibration Introduction; Start the induction heating power supply, and when the temperature of the first workpiece to be welded and / or the second workpiece to be welded rises to the first preset temperature, start the vibration device; S303, Brazing and heat preservation; After the temperature of the first workpiece to be welded and the second workpiece to be welded rises to the second preset temperature, the first workpiece to be welded and the second workpiece to be welded are kept warm; The operating parameters of the vibration device are kept unchanged; S304, Vibration terminated; After the first workpiece to be welded and the second workpiece to be welded have reached the preset heat preservation time, the induction heating power supply is turned off and the vibration device is turned off. S305, Atmosphere de-escalation; after the first workpiece to be welded and the second workpiece to be welded have cooled to a third preset temperature, and after a preset delay, the protective gas is stopped from being introduced into the welding cavity.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The brazing equipment provided in this application includes: a welding mechanism, which includes a first limiting part for placing a first workpiece to be welded; a feeding mechanism for placing a second workpiece to be welded and a welded part; a supporting member disposed on the side of the feeding mechanism and the welding mechanism, with the feeding mechanism and the welding mechanism spaced apart along the length of the supporting member; and a transfer member movably disposed on the supporting member, which is used to pick up or release the second workpiece to be welded and the welded part; the transfer member is capable of transferring the second workpiece to be welded to a position directly above the first workpiece to be welded; after the transfer member moves to a position directly above the first workpiece to be welded and releases the second workpiece to be welded, the second workpiece to be welded can enter the first workpiece to be welded, and the second workpiece to be welded is coaxially disposed with the first workpiece to be welded.

[0015] The brazing equipment provided in this application can significantly improve the assembly accuracy of the first workpiece to be welded and the second workpiece to be welded, thereby improving the uniformity of the circumferential seam between them, and can also reduce the porosity at the welding position, thus significantly improving the welding quality. The welding method provided in this application is applicable to the brazing equipment described above. It can effectively improve the uniformity of the circumferential seam in dissimilar metal induction brazing and reduce the porosity. At the same time, the high degree of automation of this welding method avoids dependence on the skills of operators, improves the consistency of the process, and thus effectively improves the quality and product consistency of batch welded parts. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the brazing equipment provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the rotating lifting assembly of the brazing equipment provided in the embodiments of this application; Figure 3 Another structural schematic diagram of the rotary lifting assembly of the brazing equipment provided in the embodiments of this application; Figure 4 This is a partial structural schematic diagram of the brazing equipment provided in the embodiments of this application; Figure 5 This is another structural schematic diagram of the brazing equipment provided in the embodiments of this application; Figure 6 The preset thermal-vibration-gas coupling curve of the rotating lifting component of the brazing equipment provided in the embodiments of this application.

[0018] Figure label: 1-First workpiece to be welded, 2-Second workpiece to be welded, 3-First limiting part, 4-Positioning part, 5-Bracket, 6-Sliding module, 7-Lifting module, 8-Magnetic clamp, 9-Fixed seat, 10-Working platform, 11-Induction heating power supply, 12-Induction coil, 13-Dust suction head, 14-Dust suction device, 15-First driving component, 16-First driving rod, 17-Second driving rod, 18-Transmission rod, 19-Support seat, 20-Lifting rod, 21-Pattern, 22-Connecting bearing, 23-Rotating component, 24-Vibration device, 25-Base, 26-Second bearing component, 27-First bearing component, 28-Slide rail, 29-Slider, 30-Handle, 31-Control cabinet, a-First direction, b-Second direction, c-Third direction. Detailed Implementation

[0019] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0020] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0021] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] The following reference Figures 1 to 6 This application describes the brazing equipment and welding method as described in its embodiments.

[0025] Firstly, see [the following] Figures 1 to 6As shown, an embodiment of this application provides a brazing apparatus, which includes a welding mechanism, a feeding mechanism, a supporting component, and a transfer component. The welding mechanism includes a first limiting part 3, which is used to place a first workpiece 1 to be welded and to keep the first workpiece 1 in a fixed position. The feeding mechanism is used to place a second workpiece 2 to be welded. The feeding mechanism and the welding mechanism are spaced apart along a first direction a. Optionally, the first workpiece 1 is a cylindrical shape with open ends, and the second workpiece 2 is cylindrical or columnar. The outer diameter of the second workpiece 2 is smaller than the inner diameter of the first workpiece 1, and the axes of both the first and second workpieces extend vertically. A support member is located on one side of the welding mechanism and the feeding mechanism. A transfer member is movably mounted on the support member. The transfer member can reciprocate above the welding mechanism and the feeding mechanism to pick up the second workpiece 2 to be welded from the feeding mechanism and transfer it to a position directly above the first workpiece 1 to be welded. Subsequently, the transfer member releases the second workpiece 2 to be welded. Under its own weight, the second workpiece 2 falls freely a certain distance and lands in the first workpiece 1 to be welded. The outer wall surface of the second workpiece 2 at least partially overlaps with the inner wall surface of the first workpiece 1 to be welded, thereby assembling the second workpiece 2 and the first workpiece 1 to be welded so that they can be welded to form a welded part. The two can naturally form a concentric circumferential seam. Compared with manual assembly of workpieces to be welded or assembly using equipment or instruments, this method can effectively improve the uniformity of the circumferential seam and reduce the porosity of the weld, thereby improving the welding quality of the first workpiece 1 and the second workpiece 2 to be welded.

[0026] Specifically, the first workpiece to be welded 1 is cylindrical or annular, and has an upper port and a lower port. The inner surface of the first workpiece to be welded 1 serves as the first welding surface. The first welding surface has an axisymmetric structure that is symmetrical about the axis of the first workpiece to be welded 1. Optionally, the first workpiece to be welded 1 has a cylindrical or annular structure.

[0027] Preferably, the diameter of the upper port of the first workpiece to be welded 1 is not less than the diameter of its lower port, so that when the second workpiece to be welded 2 is located directly above the upper port and falls freely, at least a portion of the second workpiece to be welded 2 can fall into the first workpiece to be welded 1.

[0028] In this embodiment, the second workpiece 2 to be welded has a cylindrical structure. The part of the second workpiece 2 to be welded to the first workpiece 1 to be welded forms a constricted portion. The outer diameter of the constricted portion is smaller than the outer diameter of other positions of the second workpiece 2 to be welded. The outer surface of the constricted portion serves as the second welding surface. The second welding surface has an axisymmetric structure that is symmetrical about the axis of the second workpiece 2 to be welded, and the shape of the second welding surface is adapted to the shape of the first welding surface.

[0029] At least one of the first welding surface and the second welding surface is covered with brazing filler metal. When the second workpiece to be welded falls into the first workpiece to be welded in a coaxial position with the first workpiece to be welded, the first welding surface and the second welding surface face each other, and the brazing filler metal fills the gap between the first welding surface and the second welding surface.

[0030] Optionally, in this embodiment, the first workpiece 1 to be welded is a copper part, and the second workpiece 2 to be welded is a steel part. Therefore, the brazing equipment provided in this application can achieve welding of dissimilar metals. Optionally, the second workpiece 2 to be welded is ferromagnetic.

[0031] Preferably, the brazing filler metal used in this embodiment is 612 brazing filler metal, whose typical composition is Cu-6.2P-7Sn-1.5Ni (wt%), solidus temperature is 612 ℃, liquidus temperature is 682 ℃, and it is suitable for induction brazing of copper and copper alloys.

[0032] Furthermore, the supporting component includes a bracket 5 and a sliding module 6. There are two brackets 5, which are spaced apart along the first direction a. The length of the sliding module 6 extends along the first direction a. One end of the sliding module 6 is connected to one bracket 5, and the other end of the sliding module 6 is connected to the other bracket 5.

[0033] The supporting component also includes a lifting module 7, which is slidably connected to the first sliding module 6, so that the lifting module 7 can reciprocate along the first direction a on the sliding module 6.

[0034] The length of the lifting module 7 extends along a third direction c, which is specifically a vertical direction. The transfer component is set on the lifting module 7. The lifting module 7 can drive the transfer component to rise or fall, so that the transfer component can move in two directions, namely the first direction a and the third direction c. This allows the distance and position between the transfer component and the first workpiece to be welded 1 and the second workpiece to be welded 2 to be adjusted from two dimensions, so that the transfer component can pick up and transfer the first workpiece to be welded 1, the second workpiece to be welded 2, and the welded part.

[0035] Optionally, the stroke of the sliding module 6 is greater than twice the maximum diameter of the first workpiece to be welded 1, and the lifting stroke of the lifting module 7 is greater than the sum of the heights of the first workpiece to be welded 1 and the second workpiece to be welded 2, thereby ensuring the two-dimensional position adjustment range of the transfer component.

[0036] The minimum feed amount of the lifting module 7 together with the transfer component on the sliding module 6 along the first direction a is less than the alignment accuracy of the first workpiece to be welded 1 and the second workpiece to be welded 2, thereby enabling the adjustment or setting of the movement accuracy of the transfer component, ensuring the alignment accuracy of the second workpiece to be welded 2 and the first workpiece to be welded 1 during the assembly process, and thus ensuring the uniformity of the circumferential seam between the two.

[0037] Furthermore, the transfer component is configured with a first working position, a second working position, and a third working position on the sliding module 6. Driven by a motor or cylinder, the transfer component can switch positions between the first working position, the second working position, and the third working position. When the transfer component is in the first working position, it is directly above the first limiting part 3. When the first workpiece 1 to be welded is placed in the first limiting part 3, the transfer component is directly above the first workpiece 1 to be welded. At this time, the lifting module 7 drives the transfer component to rise or fall, so that the transfer component can move closer to or away from the first workpiece 1 to be welded. When the transfer component is in the second working position, it is directly above the second workpiece 2 to be welded. At this time, the lifting module 7 drives the transfer component to rise or fall, so that the transfer component can move closer to or away from the second workpiece 2 to be welded.

[0038] Furthermore, the transfer component includes a sliding connector and a magnetic clamp 8. The sliding connector is slidably connected to the lifting module 7. The magnetic clamp 8 is disposed on the sliding connector. Specifically, the magnetic clamp 8 can be an electromagnet. When the magnetic clamp 8 is energized, it has strong magnetism. The magnetic clamp 8 can attract the second workpiece 2 to be welded by magnetic attraction. When the magnetic clamp 8 is de-energized, the magnetic force disappears, and the second workpiece 2 to be welded can be released.

[0039] Preferably, the magnetic clamp 8 is cylindrical. When the transfer member is in the first working position, the axis of the magnetic clamp 8 is collinear with the axis of the first workpiece to be welded 1. When the transfer member is in the second working position, the axis of the magnetic clamp 8 is collinear with the axis of the second workpiece to be welded 2.

[0040] Preferably, the magnetic clamp 8 has high temperature resistance. Its material is AlNiCo-700 permanent magnet alloy with a demagnetization temperature ≥760℃. The surface is plated with a Ni-Cr composite layer with a thickness of 10–15 µm, which can effectively prevent magnetic attenuation during induction heating.

[0041] Furthermore, the welding mechanism includes: a fixed base 9, a working platform 10, and an induction heating component. The working platform 10 is disposed on the upper surface of the fixed base 9, and a first limiting part 3 is disposed on the working platform 10. The first limiting part 3 includes at least two spaced limiting blocks, which together enclose a limiting space. The shape of the limiting space is adapted to the shape of the first workpiece 1 to be welded. After the first workpiece 1 to be welded is placed on the first limiting part 3, each limiting block is spaced along the circumference of the first workpiece 1 to be welded, and each limiting block can abut against the first workpiece 1 to be welded, so that the first workpiece 1 to be welded remains in a fixed position on the working platform 10. When the transfer component picks up the second workpiece 2 to be welded and moves it to the first working position, the axis of the magnetic clamp 8, the axis of the second workpiece 2 to be welded, and the axis of the limiting space are collinear, so that the axis of the second workpiece 2 to be welded can be collinear with the axis of the first workpiece 1 to be welded. When the magnetic clamp 8 is de-energized and releases the second workpiece 2 to be welded, the second workpiece 2 to be welded can fall into the first workpiece 1 to be welded, and the two have high alignment accuracy.

[0042] It should be noted that when assembling the second workpiece 2 to be welded onto the first workpiece 1, the transfer component first picks up the second workpiece 2 and moves it to the first working position. Then, the transfer component drives the second workpiece 2 to descend to a position 1-3 mm above the upper port of the first workpiece 1. The transfer component is de-energized and releases the second workpiece 2 within 0.2-0.5 seconds, allowing the second workpiece 2 to fall freely into the first workpiece 1 with a stroke of 1-3 mm, so that a concentric circumferential seam is naturally formed between the second workpiece 2 and the first workpiece 1.

[0043] Furthermore, the induction heating assembly includes an induction heating power supply 11 and an induction coil 12. The induction coil 12 is connected to the current output terminal of the induction heating power supply 11, thereby enabling the induction coil 12 to heat up after the induction heating power supply 11 energizes it. The induction coil 12 is ring-shaped, and its shape and size are adapted to the shape and size of the first workpiece 1 to be welded. The induction coil 12 is arranged around the first workpiece 1 to be welded, thereby heating the solder between the first workpiece 1 and the second workpiece 2 to be welded.

[0044] Preferably, the output frequency of the high-frequency induced current is 15–30 kHz.

[0045] The induction heating assembly also includes a chiller. The induction heating power supply 11 has a cooling water outlet and a cooling water inlet. The chiller is connected to the cooling water outlet and the cooling water inlet to cool the induction heating power supply 11. The power of the chiller is matched with the power of the induction heating power supply 11 to prevent the equipment from overheating and affecting production efficiency. Preferably, the induction coil 12 is made of hollow copper material, and cooling water can flow into the hollow area inside the induction coil 12 to ensure safety during the production process.

[0046] Furthermore, this brazing equipment also includes a gas protection component, which is located on the side of the fixed base 9. The gas protection component specifically includes a protective cover and a gas supply device. The protective cover is detachably mounted on the first limiting part 3 on the working platform 10. The protective cover can cover the first workpiece 1 and the second workpiece 2 to be welded. An induction coil 12 is arranged around the protective cover. The thickness of the protective cover is less than the difference between the inner diameter of the induction coil 12 and the maximum outer diameter of the first workpiece 1 to be welded, so that the induction coil 12 and the protective cover are spaced apart to avoid interference between them. The gas supply device can be a pressure tank storing common protective gases. The gas supply device is connected to and communicates with the protective cover through pipes, thereby supplying protective gas into the protective cover, forming a gas protective environment during the welding process, which also improves safety and environmental protection.

[0047] Preferably, the protective cover has a thickness of 5mm ± 3mm and is made of quartz. More preferably, the difference between the inner diameter of the protective cover and the outer diameter of the first workpiece to be welded 1 is greater than 3mm, to allow space for the thermal expansion of the first workpiece to be welded 1 during the welding process.

[0048] In addition, it should be noted that if the density of the protective gas is less than that of air, the inlet of the protective cover should be placed close to the lower end of the protective cover. In this case, the density of the protective gas is less than that of air. As the gas enters the interior of the protective cover, the protective gas rises and gradually fills the inner cavity of the protective cover.

[0049] Furthermore, this brazing equipment also includes a dust removal component, which is spaced apart from the fixed base 9. The dust removal component includes a suction head 13 and a suction device 14. The suction head 13 is trumpet-shaped, with a large-diameter port and a small-diameter port distributed along its axial direction. The suction device 14 is connected to the small-diameter port of the suction head 13, and the large-diameter port is positioned facing the working platform 10. After the suction device 14 is activated, the suction head 13 can suck up dust and other debris from the working platform 10 and its surroundings, thereby improving the cleanliness of the welding environment and improving the welding quality. Through the synergistic effect of the gas protection component and the dust removal component, a protective gas laminar flow of 15–25 L / min is maintained in the brazing filler metal melting zone, and the dust concentration in the cavity is controlled to <1 mg / m³.

[0050] It should be noted that the gas protection component includes a pump body that can supply air, and the dust removal component includes necessary components such as a motor and a dust collection bag. Those skilled in the art can fully understand this, so it will not be described in detail here.

[0051] Furthermore, the welding mechanism also includes a rotary lifting assembly, which is disposed on the fixed base 9 and located below the work platform 10. The rotary lifting assembly is used to drive the work platform 10 together with the first limiting part 3 to rise or fall.

[0052] The rotary lifting assembly includes a lifting component, which specifically includes a first driving element 15, a driving assembly, a transmission assembly, and a lifting assembly. The first driving element 15 is specifically a stepper motor, and preferably, it has two symmetrically arranged output ends. The driving assembly includes a first driving rod 16 and a second driving rod 17. The first driving rod 16 is connected to one output end, and the second driving rod 17 is connected to the other output end. The two driving rods extend along the same straight line.

[0053] The transmission assembly includes multiple transmission rods 18. Preferably, in this embodiment, the number of transmission rods 18 is three, and the three transmission rods 18 and two drive rods are distributed in a rectangular frame.

[0054] The lifting assembly includes: multiple support seats 19 and lifting rods 20. Preferably, there are four support seats 19, which are distributed at the top corners of the rectangular frame. Each support seat 19 is fitted with a lifting rod 20. The length of the lifting rod 20 extends vertically and the lifting rod 20 is a threaded rod.

[0055] The end of the first drive rod 16 away from the stepper motor passes through one of the support seats 19 and is threadedly connected to the lifting rod 20. The other end of the second drive rod 17 away from the stepper motor passes through another support seat 19 and is threadedly connected to the lifting rod 20. The three drive rods 18 are arranged in the same manner between the two support seats 19 and are threadedly connected to the lifting rods 20 on each support seat 19, so that the first drive rod 16, the second drive rod 17 and the three drive rods 18 drive the lifting rods 20.

[0056] The lifting assembly also includes a support plate 21, which is connected to the work platform 10. Each lifting rod 20 has a connecting plate at its upper end, and each connecting plate is connected to the support plate 21. When the first driving component 15 is started, the first driving rod 16 and the second driving rod 17 rotate synchronously. Through the transmission connection of each transmission rod 18, each lifting rod 20 rises or falls synchronously, thereby driving the support plate 21 and the work platform 10 to rise or fall. During the welding process, the two workpieces to be welded can move synchronously relative to the induction coil 12 in the height direction, improving the uniformity of the heating process of the two workpieces to be welded.

[0057] Optionally, the pallet 21 is specifically an aluminum plate, and a mounting hole is provided at the center of the pallet 21. The rotating lifting assembly also includes a connecting bearing 22, which can be a planar thrust bearing support. The connecting bearing 22 is provided in the mounting hole. The pallet 21 and the working platform 10 are spaced apart in the vertical direction and are connected by the connecting bearing 22, so that the pallet 21 can not only provide stable support for the working platform 10, but the working platform 10 can also rotate relative to the pallet 21.

[0058] The rotary lifting assembly also includes a rotary component 23, which specifically includes a geared motor. The geared motor has a drive spindle and can be mounted on the support plate 21. The drive spindle is connected to the center of the work platform 10. After the geared motor is started, it can drive the work platform 10 and the first workpiece to be welded 1 and the second workpiece to be welded 2 to rotate coaxially, thereby improving the uniformity of the circumferential temperature of the first welding surface and the second welding surface during the welding process.

[0059] It should be noted that the pallet 21 and the working platform 10 are decoupled through a planar thrust bearing to achieve a lifting and lowering repeatability accuracy of 0.01 mm.

[0060] Furthermore, this brazing equipment also includes a vibration device 24, which specifically includes a vibration motor and a control system. The vibration motor is mounted on the working platform 10, and the vibration can act on the working platform 10, so that the vibration device 24 applies a vertical micro-vibration of 50–100 Hz to the working platform 10 in the solid-liquid zone of the brazing filler metal. The vibration motor is electrically connected to the control system. By controlling the control system, the vibration motor can quickly respond to the trigger signal of the control system, and the working parameters such as the working time and vibration frequency of the vibration motor can be adjusted. When the brazing filler metal changes its heating state, under the action of the vibration device 24, the working platform 10 and the two workpieces to be welded vibrate simultaneously, improving the uniformity of the brazing filler metal distribution and promoting the expulsion of air from the circumferential seam, thereby improving the welding quality.

[0061] Furthermore, the feeding mechanism includes: a base 25, a first bearing member 27, and a second bearing member 26. The base 25 has a frame structure and is spaced apart from the fixed seat 9. The first bearing member 27 and the second bearing member 26 are spaced apart along the first direction a on the upper surface of the base 25. The first bearing member 27 is plate-shaped, and a handle 30 is provided on the end face of the first bearing member 27 away from the supporting member. Preferably, the first bearing member 27 has a thick-walled hollow structure to ensure material loading stability while reducing its own weight. The bearing platform is provided with a slide rail 28 extending along the second direction b. The first bearing member 27 is provided with a slider 29 that is adapted to slide and connected to the slide rail 28. By pulling or pushing the handle 30, the first bearing member 27 can be moved back and forth along the second direction b. Optionally, the slider 29 on the first bearing member 27 is connected to the slide rail 28 on the bearing platform by bolts with countersunk holes to ensure that there are no protrusions on the upper surface of the first bearing member 27, so as to avoid affecting the loading, unloading, and storage of the second workpiece 2 to be welded.

[0062] Preferably, the first load-bearing member 27 is made of lightweight aluminum alloy to further reduce weight.

[0063] It should be noted that the second direction b and the first direction a are two directions that are perpendicular to each other in the horizontal plane, and the first direction a, the second direction b, and the third direction c are all perpendicular to each other.

[0064] The upper surface of the first bearing member 27 is provided with a positioning part 4 for placing the second workpiece 2 to be welded. The structure of the positioning part 4 is the same as that of the first limiting part 3. A limiting space is formed by multiple spaced limiting blocks, and the limiting space is adapted to the shape of the second workpiece 2 to be welded, so that the second workpiece 2 to be welded can be stably placed in the positioning part 4. When loading or unloading, the first bearing member 27 can be pulled to move the first bearing member 27 away from one end relative to the supporting member and the transfer member, so as to facilitate the placement or removal of the second workpiece 2 to be welded and avoid interference between the second workpiece 2 to be welded and the supporting member and / or the transfer member.

[0065] Furthermore, the structure of the second load-bearing member 26 is the same as that of the first load-bearing member 27, and it can reciprocate relative to the load-bearing platform in the same way along the second direction b. This is fully understood by those skilled in the art, and will not be elaborated further here.

[0066] Optionally, the upper surface of the second bearing member 26 is provided with a second limiting part, which has an annular structure. When the transfer member is in the third working position, the magnetic clamp 8 is located directly above the second limiting part. At this time, the axes of the magnetic clamp 8, the first workpiece to be welded 1, the second workpiece to be welded 2, and the second limiting part are collinear. After the second workpiece to be welded 2 and the first workpiece to be welded 1 are welded, the transfer member can descend to attract the welded part formed by the second workpiece to be welded 2 and the first workpiece to be welded 1 together and transfer it to the upper part of the second limiting part. Then, the transfer member descends a certain distance and places the first workpiece to be welded 1 and the second workpiece to be welded 2 together in the second limiting part for temporary storage. Pulling the second bearing member 26 outward can easily remove the welded part.

[0067] Furthermore, this brazing equipment also includes a control cabinet 31 and a control unit. The control unit is located inside the control cabinet 31 and integrates a common PLC, the pump body included in the induction heating power supply 11, the gas protection component and the dust removal component, as well as the drive components included in the support components, the rotary lifting components, the vibration device 24, etc., which are respectively connected to the control unit, so that this brazing equipment can achieve linkage through the control system.

[0068] Optionally, the control unit integrates a storage module that stores preset thermal-vibration-gas coupling curves. During operation, the control unit can coordinate the working status and operating parameters of the above-mentioned mechanisms and components according to different stages of the operation, thereby improving the degree of automation.

[0069] In summary, the brazing equipment provided in this application can significantly improve the assembly accuracy of the first workpiece 1 and the second workpiece 2 to be welded, thereby improving the uniformity of the circumferential seam between them, and can also reduce the porosity at the welding position, thus significantly improving the welding quality.

[0070] Secondly, embodiments of this application also provide a welding method for the brazing equipment described in the above embodiments, thus possessing all the beneficial technical effects of the brazing equipment, and the same technical features and beneficial effects will not be repeated here.

[0071] This welding method includes the following steps: S100, Loading: Place the first workpiece to be welded 1 in the first limiting part 3 of the welding mechanism, and place the second workpiece to be welded 2 in the positioning part 4 of the feeding mechanism.

[0072] Specifically, the first workpiece 1 to be welded is stably placed in the first limiting part 3 on the working platform 10, and the second workpiece 2 to be welded is placed in the positioning part 4 of the carrying platform.

[0073] S200, workpiece assembly; the transfer component transfers the second workpiece 2 to be welded to a position directly above the first workpiece 1 to be welded, and the transfer component releases the second workpiece 2 to be welded, so that the second workpiece 2 to be welded falls into the first workpiece 1 to be welded in an attitude coaxial with the first workpiece 1 to be welded. A concentric circumferential seam is formed between the first workpiece to be welded 1 and the second workpiece to be welded 2, and brazing filler metal is placed inside the concentric circumferential seam.

[0074] Specifically, the magnetic clamp 8 moves to the second working position, moves downwards and approaches the second workpiece 2 to be welded. After the magnetic clamp 8 is energized and picks up the second workpiece 2 to be welded, it rises one distance. Then the magnetic clamp 8 drives the second workpiece 2 to be welded to the first working position. The magnetic clamp 8 drives the second workpiece 2 to be welded to descend to a position 1–3 mm above the upper end of the first workpiece 1 to be welded and stops descending. Then the magnetic clamp 8 is de-energized, and the second workpiece 2 to be welded can fall into the first workpiece 1 to be welded, and a concentric circumferential seam is naturally formed between the two.

[0075] The inner wall surface of the first workpiece 1 to be welded and / or the outer wall surface of the second workpiece 2 to be welded are coated with brazing filler metal.

[0076] S300, Coupling brazing; Perform welding operations on the first workpiece 1 and the second workpiece 2 that have been assembled.

[0077] Step S300 specifically includes: S301, Atmosphere setup: Introduce protective gas into the welding cavity.

[0078] Start the vacuuming device 14, and the vacuum head 13 will remove dust and other impurities in the welding environment; A protective cover is placed between the first workpiece to be welded 1 and the induction coil 12. The internal space of the protective cover forms a welding cavity, and protective gas is introduced into the welding cavity by the gas protection component.

[0079] S302, Heating and vibration introduction; Start the induction heating power supply 11, and when the temperature of the first workpiece to be welded and / or the second workpiece to be welded 2 rises to the first preset temperature, start the vibration device 24.

[0080] Start the induction heating power supply 11, and the induction coil 12 heats the welding cavity and the first workpiece 1 and the second workpiece 2 inside the welding cavity. When the temperature of the first workpiece 1 and / or the second workpiece 2 rises to the first preset temperature, the vibration device 24 is immediately turned on, and the vibration device 24 applies sinusoidal vibration with a frequency of 50-100 Hz to the working platform 10.

[0081] Optionally, the first preset temperature is 20 °C below the solidus of the brazing filler metal.

[0082] S303, brazing and heat preservation; after the temperature of the first workpiece 1 and the second workpiece 2 to be welded rises to the second preset temperature, the first workpiece 1 and the second workpiece 2 to be welded are kept at the second preset temperature; the operating parameters of the vibration device 24 are kept unchanged.

[0083] When the temperature of the first workpiece 1 to be welded and / or the second workpiece 2 to be welded rises to the second preset temperature, heat preservation begins to maintain the temperature of the first workpiece 1 to be welded and the second workpiece 2 to be welded within a suitable range.

[0084] Optionally, the second preset temperature is 10–30 °C above the liquidus line of the brazing filler metal.

[0085] S304, Vibration terminated; after the first workpiece to be welded 1 and the second workpiece to be welded 2 have reached the preset heat preservation time, the induction heating power supply 11 is turned off and the vibration device 24 is turned off.

[0086] During the heat preservation stage, the vibration device 24 operates normally until the preset heat preservation time is reached. After the heat preservation is completed, the induction heating power supply 11 is cut off, allowing the first workpiece 1 and the second workpiece 2 to be welded to cool naturally. When the temperature of the first workpiece 1 and the second workpiece 2 welded together drops to the third preset temperature, the vibration device 24 is turned off.

[0087] Optionally, the third preset temperature is 20 °C below the solidus of the brazing filler metal.

[0088] S305, Atmosphere de-escalation; after the first workpiece 1 and the second workpiece 2 have cooled to the third preset temperature, and after a preset delay, the supply of protective gas to the welding chamber is stopped.

[0089] After the two workpieces have cooled to room temperature, the gas protection component is turned off after a preset delay to stop the supply of protective gas.

[0090] Optionally, the preset duration is 30–60 seconds.

[0091] S400, unloading; after welding is completed, the transfer component transfers the first workpiece 1 and the second workpiece 2, which are welded together, to the feeding mechanism.

[0092] Specifically, after welding is completed, the magnetic clamp 8 moves to the first working position and descends a certain distance. When the magnetic clamp 8 is powered on, it can pick up the first workpiece 1 and the second workpiece 2 that are welded together. Then the magnetic clamp 8 rises and moves to the third working position, and descends at the third working position to place the first workpiece 1 and the second workpiece 2 into the second limiting part. Finally, it can be taken out.

[0093] Repeat the above steps to complete the batch welding.

[0094] It should be noted that the process steps of this welding method can be operated manually or controlled by the control system of the above-mentioned brazing equipment. On the one hand, it can improve the degree of automation, and on the other hand, it can improve the accuracy of switching of operation nodes, thereby effectively reducing the thickness of intermetallic compound at the interface of dissimilar metal joints, the porosity of the brazing seam, and the coaxiality error.

[0095] It is evident that the welding method provided in this application can effectively improve the uniformity of the circumferential seam in dissimilar metal induction brazing and reduce porosity. At the same time, the high degree of automation of this welding method avoids dependence on operator skills, improves process consistency, and thus effectively improves the quality and product consistency of batch welded parts.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A brazing device, characterized in that, include: A welding mechanism, the welding mechanism including a first limiting part for placing a first workpiece to be welded; A feeding mechanism for placing a second workpiece to be welded and a welded part that has been welded; A supporting member is provided on the side of the feeding mechanism and the welding mechanism, and the feeding mechanism and the welding mechanism are spaced apart along the length direction of the supporting member; A transfer member, movably disposed on the support member, is used to pick up or release the second workpiece to be welded and the weldment; The transfer member is capable of transferring the second workpiece to be welded to a position directly above the first workpiece to be welded; After the transfer member moves to directly above the first workpiece to be welded and releases the second workpiece to be welded, the second workpiece to be welded can enter the first workpiece to be welded, and the second workpiece to be welded and the first workpiece to be welded are coaxially arranged.

2. The brazing equipment according to claim 1, characterized in that, The transfer member has a first working position, a second working position, and a third working position relative to the support member on the support member, and the transfer member is capable of switching positions between the first working position, the second working position, and the third working position; The first working position is located directly above the first limiting part. The feeding mechanism includes a positioning part for placing the second workpiece to be welded and a second limiting part for placing the welded part. The second working position is located directly above the positioning part, and the third working position is located directly above the second limiting part.

3. The brazing equipment according to claim 1, characterized in that, The supporting component includes: support; A sliding module is disposed on the bracket, and the length of the sliding module extends along a first direction; A lifting module is slidably connected to a sliding module, and the length of the lifting module extends along a third direction; the transfer member is slidably disposed on the lifting module.

4. The brazing equipment according to claim 2, characterized in that, The transfer component includes a magnetic clamp, which is columnar. In the first working position, the axis of the magnetic clamp is collinear with the axis of the second workpiece to be welded. In the second working position, the axis of the magnetic clamp is collinear with the axis of the first workpiece to be welded.

5. The brazing equipment according to any one of claims 1 to 4, characterized in that, The welding mechanism includes: Fixed base; A working platform is mounted on the fixed base; a first limiting part is mounted on the working platform. An induction heating assembly is disposed on the side of the working platform; the induction heating assembly includes an induction heating power supply and an induction coil, the induction coil being connected to the induction heating power supply and surrounding the first workpiece to be welded; A rotary lifting assembly is mounted on the fixed base and connected to the work platform.

6. The brazing equipment according to claim 5, characterized in that, The welding mechanism further includes a vibration device, which acts on the working platform to cause the working platform to vibrate the first workpiece to be welded and the second workpiece to be welded.

7. The brazing equipment according to claim 5, characterized in that, The brazing equipment also includes: A gas protection assembly, comprising: a protective cover and a gas supply device, wherein the protective cover is connected to the gas supply device; the protective cover is detachably disposed on the first limiting portion; A dust removal assembly, comprising: a suction head and a suction device, wherein the suction head is connected to the suction device and is positioned facing the work platform.

8. The brazing equipment according to claim 2, characterized in that, The feeding mechanism includes: The base is provided with a support platform; A first supporting member is movably disposed on the supporting platform along a second direction; the positioning part is disposed on the first supporting member; The second load-bearing member is movably disposed on the load-bearing platform along the second direction.

9. A welding method, characterized in that, The welding method includes the following steps: S100, Loading; The first workpiece to be welded is placed in the first limiting part of the welding mechanism, and the second workpiece to be welded is placed in the positioning part of the feeding mechanism; S200, Workpiece assembly; The transfer member transfers the second workpiece to be welded to a position directly above the first workpiece to be welded. The transfer member then releases the second workpiece to be welded, causing it to fall into the first workpiece to be welded in an orientation coaxial with the first workpiece to be welded. A concentric circumferential seam is formed between the first workpiece to be welded and the second workpiece to be welded, and brazing filler metal is disposed within the concentric circumferential seam; S300, Coupling brazing; Perform welding operation on the assembled first workpiece to be welded and the second workpiece to be welded; S400, material unloading; After welding is completed, the transfer component transfers the first workpiece to be welded and the second workpiece to be welded together to the feeding mechanism.

10. The welding method according to claim 9, characterized in that, Step S300 includes: S301. Atmosphere setup: Introduce shielding gas into the welding cavity; S302, Heating and Vibration Introduction; Start the induction heating power supply, and when the temperature of the first workpiece to be welded and / or the second workpiece to be welded rises to the first preset temperature, start the vibration device; S303, Brazing and heat preservation; After the temperature of the first workpiece to be welded and the second workpiece to be welded rises to the second preset temperature, the first workpiece to be welded and the second workpiece to be welded are kept warm; The operating parameters of the vibration device are kept unchanged; S304, Vibration terminated; After the first workpiece to be welded and the second workpiece to be welded have reached the preset heat preservation time, the induction heating power supply is turned off and the vibration device is turned off. S305, Atmosphere de-escalation; after the first workpiece to be welded and the second workpiece to be welded have cooled to a third preset temperature, and after a preset delay, the protective gas is stopped from being introduced into the welding cavity.

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