Brazing device and brazing method for die-casting aluminum alloy

Abstract

The invention discloses a brazing device and method for die-casting aluminum alloy, and relates to the technical field of brazing, and the brazing method comprises the steps of solder coating, assembling, placing of an assembly into a heating cavity, and heating and welding after filling of graphite powder. The brazing device is composed of a rack, an electric heating furnace, a switch device, a sliding table, a lifting device, a hopper, a gate valve and the like. The switch device comprises a hollow support, a connecting rod and a conical head, and a shifting rod in the hopper can push the connecting rod to start discharging. The conical bottom of the electric heating furnace facilitates discharging, the internal grate plate prevents interference, and the top cover plate is detachable. The special structure of the hoop prevents the mica tape from invading weld joints. According to the method, the welding reliability is effectively improved, the die-casting aluminum alloy workpiece is buried through the graphite, and the graphite powder has good heat-conducting property, so that an assembled component can be uniformly heated; the mica tape enables the graphite powder to be isolated from a welding seam of the two die-casting aluminum alloy workpieces, the graphite powder is prevented from entering the welding seam, and the situation that the graphite powder adheres to the welding seam after welding is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of brazing, and in particular to a brazing device and a brazing method for die-cast aluminum alloy. Background Art

[0002] In industrial production, die-cast aluminum alloys are widely used in the manufacture of various heat sinks due to their excellent properties. However, the quality of their welding is directly related to component performance and product reliability. Traditional methods for welding die-cast aluminum alloys mostly rely on fusion welding or brazing. While fusion welding can achieve a metallurgical bond between metals, it is prone to significant thermal deformation, which affects workpiece precision. It also requires high operator skills and can result in inconsistent welding quality. Conventional brazing methods also have drawbacks, such as uneven heating of the workpiece during heating, which can easily lead to localized overheating and reduced joint performance.

[0003] A Chinese patent (publication number: CN115889962A) discloses a die-cast aluminum alloy welding method and apparatus, as well as a die-cast aluminum alloy radiator, that addresses the aforementioned issues. This patented technical solution involves burying the entire radiator within sand, shielding it from the atmosphere and achieving high-quality brazing. However, this method also has certain drawbacks, such as the weld being prone to misalignment and sand intrusion. During the brazing process, the sand must be repeatedly manually removed to weld the next workpiece, resulting in low efficiency. To address these technical issues, those skilled in the art need to develop an efficient and stable brazing method and apparatus. Summary of the Invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a brazing device and a brazing method for die-cast aluminum alloy.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A brazing device for die-cast aluminum alloy, comprising: frame; The electric heating furnace is suspended on the top of the frame, and a discharge pipe is provided at the bottom of the electric heating furnace; The switch device is installed in the discharge pipe of the electric heating furnace; Slide table, installed at the bottom of the frame; The lifting device is installed on the slider of the slide, and the slide drives the lifting device away from or close to the electric heating furnace; The hopper is installed on a lifting device, which drives the hopper up or down; a discharge port is provided at the bottom of the hopper; The gate valve is installed at the discharge port of the hopper.

[0006] Preferably, the switch device comprises: Hollow bracket, installed in the discharge pipe of the electric heating furnace; The connecting rod is vertically movable and penetrates the hollow bracket and is slidably engaged with the hollow bracket; The conical head is installed on the top of the connecting rod, and the maximum diameter of the conical head is larger than the inner diameter of the discharge pipe; Among them, a lever that can resist the bottom of the connecting rod is provided in the hopper. The lever pushes the connecting rod, and the connecting rod drives the conical head to move up, opening the discharge pipe and discharging the graphite in the electric heating furnace into the hopper.

[0007] Preferably, the bottom of the electric heating furnace is a conical structure.

[0008] Preferably, a grate plate is provided in the electric heating furnace.

[0009] Preferably, a cover plate is detachably connected to the top of the electric heating furnace.

[0010] Preferably, the hoop plate of the hoop is in a V-shaped or groove-shaped structure. After the hoop is assembled with the two die-cast aluminum alloy workpieces, the joint of the two die-cast aluminum alloy workpieces is located in the cavity of the hoop plate.

[0011] Preferably, the gate valve is an electric valve.

[0012] Preferably, the slide is a screw nut slide driven by a motor.

[0013] Preferably, the lifting device comprises: A hollow column with a slot on one side; The sliding seat is slidably installed in the hollow column, and the sliding seat is fastened to the hopper on the side corresponding to the slot of the hollow column; The driving device is installed on the top of the hollow column and is used to drive the sliding seat to move up and down along the hollow column.

[0014] A brazing method using a brazing device of a die-cast aluminum alloy comprises the following steps: S1. Solder coating: applying paste-like soft solder to the joint of two die-cast aluminum alloy workpieces to be welded; S2. Assemble, align the weld seams of the two die-cast aluminum alloy workpieces and wrap the mica tape around the weld seams for at least one circle; then, lock the mica tape and the two die-cast aluminum alloy workpieces with a clamp; S3, heating and welding, placing the components assembled in step S2 into the heating chamber of the brazing device, then filling the heating chamber with graphite powder until the workpiece is buried, starting the brazing device, and performing heating and welding.

[0015] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: (1) During assembly, the solder-coated workpieces are precisely aligned and assembled, and the weld seam is wrapped with mica tape and securely locked with a clamp. This ensures the stability and integrity of the assembly while preventing graphite powder from entering the weld seam and graphite powder from adhering to the weld seam after welding. Furthermore, leakage of the solder after melting is avoided, effectively improving the reliability of the welding effect. The special structural design of the clamp allows it to firmly secure the workpiece while preventing the mica tape from intruding into the weld seam, further enhancing the stability of the welding.

[0016] (2) The conical structure design at the bottom of the electric heating furnace in the brazing device of the present invention facilitates the automatic emptying of graphite powder, improves the efficiency and thoroughness of discharge, reduces material waste, and also facilitates subsequent welding operations. The grate plate setting inside the electric heating furnace can avoid interference with the components when the switch device is turned on, ensuring the smooth progress of the welding process and protecting the welding quality.

[0017] (3) The switch device of the present invention does not require an additional power source and has a simple and reliable structure, which reduces the complexity and maintenance cost of the equipment and improves the discharge efficiency. Through the cooperation of the lever and the connecting rod, the discharge of graphite powder is convenient and fast, ensuring the smooth progress of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the assembled die-cast aluminum alloy workpiece; Figure 3 It is a cross-sectional view of the assembled die-cast aluminum alloy workpiece; Figure 4 It is a top view of the electric heating furnace; Figure 5 is a structural schematic diagram of a switch device; Figure 6 Schematic diagram of the structure of the hollow bracket; Figure 7 It is a structural diagram of the lifting device.

[0019] In the figure: 1. Die-cast aluminum alloy workpiece; 2. Mica tape; 3. Clamp; 4. Frame; 5. Electric heating furnace; 6. Switch device; 6-1. Hollow bracket; 6-2. Connecting rod; 6-3. Conical head; 7. Slide; 8. Lifting device; 8-1. Hollow column; 8-2. Sliding seat; 8-3. Driving device; 9. Hopper; 10. Gate valve; 11. Grate plate; 12. Cover plate; 13. Push rod. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0022] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Example 1:

[0023] Combined with attachment Figure 1 、 4 6. A die-cast aluminum alloy brazing apparatus and method. The die-cast aluminum alloy brazing apparatus comprises a frame 4, an electric heating furnace 5, a slide 7, and a lifting device 8. The electric heating furnace 5 is suspended from the top of the frame 4, with a discharge pipe at its bottom. This discharge pipe is primarily used to drain the graphite powder from the furnace 5 after welding is complete. To prevent graphite powder leakage during welding, a switch device 6 is installed within the discharge pipe of the furnace 5. By closing the switch device 6 during welding, the loss of graphite powder is effectively prevented, ensuring the normal progress of the welding process.

[0024] A slide 7 is installed at the bottom of the frame 4, and a lifting device 8 is installed on the slider of the slide 7. The setting of the slide 7 has a specific purpose. It can drive the lifting device 8 away from or close to the electric heating furnace 5 through its own movement, so as to adjust the relative position relationship between the two and provide convenience for the entire welding process. A hopper 9 is installed on the lifting device 8, and the lifting device 8 can drive the hopper 9 to achieve an upward or downward movement. A discharge port is provided at the bottom of the hopper 9, and a gate valve 10 is installed at the discharge port. The gate valve 10 can be controlled by a switch to discharge or cut off the material in the hopper 9.

[0025] After welding is complete, the lifting device 8 is controlled to lower the hopper 9 to a position below the bottom of the discharge pipe of the electric heating furnace 5. Next, the slide 7 is controlled to move, causing the lifting device 8 to bring the hopper 9 closer to the electric heating furnace 5 until it is precisely positioned directly below the furnace 5. At this point, the switch 6 is activated, and the graphite powder within the furnace 5 falls into the hopper 9 under the action of gravity. Once the die-cast aluminum alloy workpiece 1 is fully exposed, it can be removed and replaced with the next pre-assembled component, ready for the next welding cycle.

[0026] Afterwards, the slide 7 is controlled to move again, causing the lifting device 8 to move the hopper 9 away from the electric heating furnace 5 until the hopper 9 is misaligned with the electric heating furnace 5. Next, the lifting device 8 is controlled to raise the hopper 9 until its discharge port is above the height of the electric heating furnace 5. The slide 7 is controlled again, causing the lifting device 8 to move the hopper 9 closer to the electric heating furnace 5 until the hopper 9 is directly above the electric heating furnace 5. At this point, the gate valve 10 is opened, and the graphite powder in the hopper 9 falls smoothly into the electric heating furnace 5, completely burying the die-cast aluminum alloy workpiece 1. The electric heating furnace 5 can then be opened for heating and welding. The gate valve 10 can be an electric valve for easy automatic control. Meanwhile, after the hopper 9 completes the above movement, it moves along the opposite trajectory to the bottom of the electric heating furnace 5, waiting to receive graphite powder again for the next cycle.

[0027] Since the graphite powder is recycled throughout the entire process, it maintains a relatively high residual temperature when it covers the two new die-cast aluminum alloy workpieces 1 to be welded. This is crucial because it effectively shortens the heating time during welding, significantly reducing energy consumption throughout the welding process. This has positive implications for improving production efficiency and reducing production costs.

[0028] A brazing method using the above-mentioned die-cast aluminum alloy brazing device comprises the following steps: Step S1: Solder coating. A solder paste is carefully and evenly applied to the joint between the two die-cast aluminum alloy workpieces 1 to be welded. During the coating process, the operator must be extremely vigilant to ensure uniform distribution of the solder paste and avoid breakpoints or localized accumulation. Only a uniform coating can lay a good foundation for subsequent welding.

[0029] Next comes step S2: assembly. The two solder-coated die-cast aluminum alloy workpieces 1 are precisely aligned and assembled to ensure a perfect weld. The weld seam is wrapped with mica tape 2 at least once, ensuring it is flat and tight. Then, the mica tape 2 and the two die-cast aluminum alloy workpieces 1 are securely fastened using a clamp 3 to ensure the stability of the entire assembly. During the assembly process, operators must exercise extreme caution to ensure the integrity and stability of the assembly.

[0030] Go to step S3 and perform heating and welding. Carefully place the components assembled in step S2 into the heating chamber of the brazing device. Graphite powder needs to be filled in the heating chamber until the workpiece is completely buried. Subsequently, start the brazing device and perform heating and welding. Graphite powder has good thermal conductivity, which can make the assembled components heated evenly, thereby effectively improving the brazing quality and ensuring the stability and reliability of the welding effect. When placing the assembled components into the heating chamber of the brazing device, it is important to keep the weld as horizontal as possible, which is of great significance for ensuring the welding effect. The mica tape 2 plays a key role in the entire welding process. It can effectively isolate the graphite powder from the welds of the two die-cast aluminum alloy workpieces 1, preventing the graphite powder from entering the welds, and also avoiding the occurrence of graphite powder sticking to the welds after welding. Moreover, during welding, the mica tape 2 will not be welded to the die-cast aluminum alloy workpiece 1, and can prevent leakage after the soft solder melts.

[0031] The hoop plate of the clamp 3 is V-shaped or groove-shaped. After the clamp 3 is assembled with the two die-cast aluminum alloy workpieces 1, the joint between the two die-cast aluminum alloy workpieces 1 is located in the cavity of the hoop plate. This can ensure that the two die-cast aluminum alloy workpieces 1 are firmly fixed and prevent the mica tape 2 from invading the weld.

[0032] After welding is completed, the die-cast aluminum alloy workpiece 1 is removed and, after cooling naturally, the clamp 3 and the mica tape 2 are removed in sequence. It should be noted that the clamp 3 and the mica tape 2 are both reusable components, which reduces production costs to a certain extent. Example 2:

[0033] Combined with attachment Figure 1 、 4~6, a brazing device for die-cast aluminum alloy, based on Example 1, the switch device 6 is designed and improved in detail. The switch device 6 is mainly composed of a hollow bracket 6-1, a connecting rod 6-2 and a conical head 6-3. Among them, the hollow bracket 6-1 is installed inside the discharge pipe of the electric heating furnace 5, playing a supporting and guiding role. The connecting rod 6-2 is vertically movable and passes through the hollow bracket 6-1, forming a sliding fit relationship with the hollow bracket 6-1, ensuring that the connecting rod 6-2 can move freely in the vertical direction. A conical head 6-3 is installed on the top of the connecting rod 6-2, and the maximum diameter of the conical head 6-3 is designed to be larger than the inner diameter of the discharge pipe. When the conical head 6-3 is at the top position of the discharge pipe orifice, it can tightly close the discharge pipe to ensure that graphite powder will not leak during the welding process. At this time, the switch device 6 is in a closed state. When discharge is required, the connecting rod 6-2 drives the conical head 6-3 to move upward, and a certain gap will be formed between the conical head 6-3 and the top of the discharge pipe orifice. At this time, the switch device 6 is in the open state, so that the graphite powder inside the electric heating furnace 5 can be smoothly discharged from the electric heating furnace 5 along the gap between the conical head 6-3 and the top of the discharge pipe orifice, completing the discharge operation.

[0034] It should be emphasized that the diameter of the connecting rod 6-2 should be smaller than the inner diameter of the discharge pipe. The purpose of this design is to ensure that the graphite powder can flow freely and unhindered during the discharge process, thereby improving the discharge efficiency.

[0035] Furthermore, a lever 13 capable of abutting the bottom of the connecting rod 6-2 is provided inside the hopper 9. When the graphite powder in the electric heating furnace 5 needs to be emptied, the operation process is as follows: First, the hopper 9 is accurately moved and located directly below the electric heating furnace 5 through the control device. Then, the lifting device 8 is started to control the hopper 9 to perform an ascending action. When the hopper 9 rises, the lever 13 pushes the connecting rod 6-2. Through the pushing action of the lever 13 on the connecting rod 6-2, the connecting rod 6-2 drives the conical head 6-3 to move upward, thereby opening the discharge pipe, so that the graphite powder in the electric heating furnace 5 can be smoothly discharged into the hopper 9. The advantage of this design is that there is no need to configure an additional power source for the switch device 6. At the same time, the overall structure of the switch device 6 is simple and has high reliability, which reduces the complexity and maintenance cost of the equipment.

[0036] Furthermore, the bottom of the electric heating furnace 5 is designed with a conical structure. This structural design facilitates more convenient and automatic emptying of the graphite powder within the electric heating furnace 5, improving the efficiency and thoroughness of the discharge. Furthermore, a grate plate 11 is provided within the electric heating furnace 5. The height of the grate plate 11 is greater than the upward travel of the conical head 6-3. Placing the assembled components on the grate plate 11 effectively prevents interference with the components when the switch device 6 is turned on, ensuring a smooth welding process. Example 3:

[0037] Combined with attachment Figure 1 and 7 A die-cast aluminum alloy brazing device is further optimized based on the design of Example 1 or Example 2. A cover plate 12 is detachably mounted on the top of the electric heating furnace 5. During the brazing operation, the cover plate 12 can be installed on the top of the electric heating furnace 5 to reduce heat loss, improve thermal efficiency, and thus reduce energy consumption. The design of the cover plate 12 also enhances temperature uniformity within the electric heating furnace 5, improving welding quality.

[0038] Furthermore, the slide 7 adopts a screw nut slide driven by a motor. This type of slide has a simple structure, is very easy to control, and is reliable in operation. It can accurately control the horizontal movement position of the hopper 9, ensure that its relative position with the electric heating furnace 5 is accurate, and provide stable support and precise positioning for the welding operation.

[0039] Furthermore, the lifting device 8 is composed of a hollow column 8-1, a sliding seat 8-2 and a driving device 8-3. Among them, the bottom of the hollow column 8-1 is installed on the slider of the slide 7, and a slot is provided on one side of the hollow column 8-1 to facilitate the installation and fixation of the sliding seat 8-2. The sliding seat 8-2 is slidably installed inside the hollow column 8-1, and the side of the sliding seat 8-2 corresponding to the slot of the hollow column 8-1 is fastened to the hopper 9 to ensure that the hopper 9 remains stable during the lifting process. The driving device 8-3 is installed on the top of the hollow column 8-1, and its main function is to drive the sliding seat 8-2 to perform a lifting action along the hollow column 8-1. Through the lifting action of the sliding seat 8-2, the hopper 9 can be driven to achieve corresponding lifting and lowering, meeting the requirements for the position of the hopper 9 at different stages of the welding process. As for the driving device 8-3, it can be in the form of a telescopic cylinder, or it can be a screw nut lifting mechanism driven by a motor with a structure similar to that of the slide 7. The specific choice can be flexibly adjusted according to actual production needs and equipment configuration.

[0040] It should be noted that the slide 7 and the lifting device 8 can also be selected from similar devices available on the market according to actual production needs. As long as the selected device can meet the requirements of completing the lifting action of the hopper 9 and the horizontal displacement action with the electric heating furnace 5, this design not only ensures the versatility of the equipment, but also provides users with more flexibility.

[0041] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A brazing device for die-cast aluminum alloy, characterized in that: include: Rack (4); The electric heating furnace (5) is suspended on the top of the frame (4), and a discharge pipe is provided at the bottom of the electric heating furnace (5); A switch device (6) is installed in a discharge pipe of the electric heating furnace (5); A slide (7) is mounted on the bottom of the frame (4); A lifting device (8) is mounted on a slider of the slide (7) and is driven by the slide (7) to move the lifting device (8) away from or closer to the electric heating furnace (5); The hopper (9) is mounted on the lifting device (8), and the hopper (9) is driven to rise or fall by the lifting device (8); a discharge port is provided at the bottom of the hopper (9); The gate valve (10) is installed at the discharge port of the hopper (9).

2. The die-cast aluminum alloy brazing device according to claim 1, characterized in that: The switch device (6) comprises: A hollow bracket (6-1) is installed in a discharge pipe of the electric heating furnace (5); A connecting rod (6-2) vertically moves through the hollow bracket (6-1) and is slidably engaged with the hollow bracket (6-1); The conical head (6-3) is installed on the top of the connecting rod (6-2), and the maximum diameter of the conical head (6-3) is larger than the inner diameter of the discharge pipe; A shifting rod (13) capable of resisting the bottom of the connecting rod (6-2) is provided in the hopper (9). The shifting rod (13) pushes the connecting rod (6-2), and the connecting rod (6-2) drives the conical head (6-3) to move upward, thereby opening the discharge pipe and discharging the graphite in the electric heating furnace (5) into the hopper (9).

3. The die-cast aluminum alloy brazing device according to claim 1 or 2, characterized in that: The bottom of the electric heating furnace (5) is a conical structure.

4. The die-cast aluminum alloy brazing device according to claim 3, characterized in that: A grate plate (11) is provided in the electric heating furnace (5).

5. The die-cast aluminum alloy brazing device according to claim 1, wherein: A cover plate (12) is detachably connected to the top of the electric heating furnace (5).

6. The die-cast aluminum alloy brazing device according to claim 1, wherein: The gate valve (10) is an electric valve.

7. The die-cast aluminum alloy brazing device according to claim 1, characterized in that: The slide (7) is a screw nut slide driven by a motor.

8. The die-cast aluminum alloy brazing device according to claim 1, wherein: The lifting device (8) comprises: A hollow column (8-1) having a slot on one side; The sliding seat (8-2) is slidably installed in the hollow column (8-1), and the sliding seat (8-2) is fastened to the hopper (9) on one side corresponding to the slot of the hollow column (8-1); The driving device (8-3) is installed on the top of the hollow column (8-1) and is used to drive the sliding seat (8-2) to move up and down along the hollow column (8-1).

9. A brazing method using the die-cast aluminum alloy brazing device according to claim 1, characterized in that: The following steps are involved: S1, solder coating, coating a paste-like soft solder on the joint of two die-cast aluminum alloy workpieces (1) to be welded; S2, assembling, aligning the weld seams of the two die-cast aluminum alloy workpieces (1), and wrapping the mica tape (2) around the weld seams for at least one circle; then locking the mica tape (2) and the two die-cast aluminum alloy workpieces (1) by means of a clamp (3); S3, heating and welding, placing the components assembled in step S2 into the heating chamber of the brazing device, then filling the heating chamber with graphite powder until the workpiece is buried, starting the brazing device, and performing heating and welding.

10. The brazing method of the die-cast aluminum alloy brazing device according to claim 9, characterized in that: The hoop plate of the hoop (3) is in a V-shaped or groove-shaped structure, and after the hoop (3) is assembled with the two die-cast aluminum alloy workpieces (1), the joint of the two die-cast aluminum alloy workpieces (1) is located in the cavity of the hoop plate.

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