Cooling device applied to friction stir welding process

Abstract

The utility model relates to the technical field of friction stir welding, and discloses a cooling device applied to a friction stir welding process. The device comprises a tool body and a spraying mechanism, the top of the tool body is in a basin shape, and a workpiece is installed at the inner concave position of the tool body. The spraying mechanism is arranged on the tool body around the workpiece and can spray a cooling medium to the welding part of the workpiece; the tool body is further provided with a flow guide groove which is located between the workpiece and the spraying mechanism and used for collecting waste. The top of the tool body is arranged to be of the basin structure, the spraying mechanism is used for providing cooling media for the welding portion of the workpiece, atomized air mass can be formed around the workpiece, and the efficient and stable cooling effect is achieved. Meanwhile, a flow guide groove is designed in the tool, metal scraps and waste water are effectively recycled, the waste water can be recycled after being treated, and the resource utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of friction stir welding, and specifically relates to a cooling device applied to a friction stir welding process. BACKGROUND

[0002] Friction stir welding refers to the use of heat generated by the friction between a high-speed rotating welding tool and a workpiece to locally soften the plasticity of the welded material. When the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear 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. It is widely used in aerospace, new energy and three-electricity fields, and can be applied to the welding of the same kind of materials and different kinds of materials. However, the welding of different kinds of materials, such as copper, magnesium, and die-cast aluminum, has strict requirements in related industries, and the welding of different kinds of materials is more difficult than the welding of the same kind of materials. This is because the physical properties such as melting point, thermal conductivity, and linear expansion coefficient of different kinds of metal materials differ greatly, and a large amount of intermetallic compounds will be produced during the solidification process of the two metals. Intermetallic compounds are hard and brittle phases that not only reduce the strength of the weld but also increase the metal resistance. Therefore, the control of welding temperature is crucial for the welding quality and the forming of different kinds of materials. When welding different kinds of materials, cooling treatment is often needed to reduce the differences between different kinds of materials.

[0003] Traditional cooling methods often cannot effectively cope with high-temperature environments, resulting in difficulties in welding different kinds of materials and forming defects. For example, a friction stir welding protection device disclosed in Chinese patent CN112355464B increases a cold air generating structure on the drill bit of the friction stir welding to achieve air cooling. Although this air cooling scheme can have a certain cooling effect, its cooling effect is limited, especially during the welding process, the temperature change is not uniform, and the cooling effect is affected by factors such as wind speed and airflow distribution, making it difficult to ensure uniform cooling of the welding area. In addition, the heat dissipation capacity of the air cooling method is limited and cannot meet the demand for efficient cooling in high-strength welding operations, so it is urgent to solve. UTILITY MODEL CONTENT

[0004] To solve the technical problem of poor cooling effect of friction stir welding when welding different kinds of materials in the prior art, the utility model provides a cooling device applied to a friction stir welding process.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The utility model discloses a cooling device applied to the friction stir welding process, which comprises a tool body and a spraying mechanism.

[0007] As a further improvement of the utility model, the projection of the flow guide groove on the horizontal plane is in a closed loop shape, so as to divide the top of the tool body from outside to inside into a first boss for mounting the spraying mechanism and a second boss for bearing the workpiece, and the first boss and the second boss have a height difference.

[0008] As a further improvement of the utility model, the bottom wall of the flow guide groove is a slope with a slope.

[0009] As a further improvement of the utility model, the tool body is further provided with a discharge port in communication with the low-lying area of the flow guide groove.

[0010] As a further improvement of the utility model, the spraying mechanism comprises a plurality of groups of air guns arranged around the workpiece; each group of air guns is additionally provided with a shunt pipe immersed in water at the air cooling air inlet end, so that the spray head of the air gun forms a spray while spraying air by using pressure.

[0011] As a further improvement of the utility model, the cooling device further comprises a limiting mechanism; the limiting mechanism comprises an elbow clamp fixedly installed on the tool body, and the chuck of the elbow clamp can abut against the surface of the workpiece in the locked state to press the workpiece tightly on the tool body.

[0012] As a further improvement of the utility model, the limiting mechanism further comprises a power source for swinging the handle of the elbow clamp.

[0013] As a further improvement of the utility model, the cooling device further comprises a water tank in communication with the discharge port; the liquid inlet end of the spraying mechanism is arranged in the water tank to realize water circulation.

[0014] As a further improvement of the utility model, the discharge port and / or the water tank is provided with a filter screen.

[0015] As a further improvement of the utility model, the tool body is a metal structure, and the surface has a blackening treated anti-rust layer.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. The utility model discloses a pot structure is provided to the top of tool body, provides cooling medium to workpiece welding position with the use of spraying mechanism, and can form atomized air mass around workpiece, realizes the stable cooling effect of high efficiency. Meanwhile, the flow guide groove is designed on the tool, and the metal scrap and waste water are effectively recycled, and the waste water can be recycled after treatment, thereby improving the resource utilization.

[0018] 2. The utility model discloses a tool body with double bosses with height difference, realizing functional division, and the first boss serves as an independent installation platform, facilitating the adjustment and maintenance of the spraying mechanism and the limiting mechanism. A suitable limiting groove can be formed in the center of the second boss according to the shape and size of the workpiece, which serves as a basic limiting function for the workpiece. The workpiece is in a lower position, and the water and scrap produced in the welding and cooling process are not easy to splash out of the tool body, preventing pollution of the space where the device is located. On the other hand, the installation height of the spraying mechanism is higher than the surface of the workpiece, facilitating the formation of the optimal spray angle.

[0019] 3. The bottom wall of the flow guide groove has a slope, which maintains a certain self-flowing speed of the waste water with scrap, avoids the deposition of scrap, and maintains the effective volume of the flow guide groove. At the same time, the low-lying area is provided with a discharge port for centralized discharge, improving the waste liquid collection efficiency and realizing the recycling of scrap and waste water in cooperation with the subsequent filtering system.

[0020] 4. The utility model discloses a plurality of elbow clamps are arranged on the tool body, which can provide continuous and stable locking force, and the multi-point clamping layout can ensure uniform stress of the workpiece, keep it horizontal and stationary during the welding process, and ensure the smooth progress of the friction stir welding process. The elbow clamps can be manually adjusted by the handle, or automatically clamped by the power source, facilitating the integration of PLC control to realize automation and synchronous or asynchronous clamping as needed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective structural schematic view of the cooling device applied in the friction stir welding process in the embodiment of the utility model.

[0022] Figure 2 It is a perspective structural schematic view of the tool body in the embodiment of the utility model. Figure 1

[0023] Figure 3 It is a sectional view of the tool body in the embodiment of the utility model from the front view.

[0024] Figure 4 It is a perspective structural schematic view of the spraying mechanism in the embodiment of the utility model.

[0025] Figure 5 It is a perspective structural schematic view of the limiting mechanism in the embodiment of the utility model. ​

[0026] Figure 6 It is a sectional view schematic diagram of the water tank and filter screen in the utility model embodiment.

[0027] In the figure: 1, tool body; 10, diversion groove; 101, bottom wall; 11, first boss; 12, second boss; 120, limiting groove; 13, discharge port; 2, spraying mechanism; 21, air gun; 211, air-cooled air inlet end; 212, shunt pipe; 213, spray head; 3, limiting mechanism; 31, elbow clamp; 311, chuck; 312, handle; 4, water tank; 5, filter screen. DETAILED DESCRIPTION

[0028] The technical scheme in the utility model embodiments will be described clearly and completely below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] Please refer to Figures 1 to 6 The embodiment provides a cooling device applied to a friction stir welding process, which comprises a tool body 1, a spraying mechanism 2, a limiting mechanism 3 and a water tank 4.

[0030] The top of the tool body 1 is in a basin shape, and the inner depression is used for bearing a workpiece. The tool body 1 can be in a cuboid structure and can be blackened to prevent rust. Because a large amount of water and metal waste (for example, aluminum scraps) can be generated in the welding process, the top of the tool body 1 is provided with a diversion groove 10 between the workpiece and the spraying mechanism 2, so that the drainage problem is solved. The diversion groove 10 divides the top of the tool body 1 into a first boss 11 located at the periphery and a second boss 12 located at the center. The double-boss design realizes functional division. The first boss 11 serves as an independent installation platform, which is convenient for adjusting and maintaining the spraying mechanism 2 and the limiting mechanism 3. The second boss 12 is provided with a suitable limiting groove 120 in the center according to the shape and size of the workpiece, which plays a basic limiting function on the workpiece.

[0031] In the embodiment, the upper surface height of the first boss 11 is higher than the upper surface height of the second boss 12, so that the workpiece on the second boss 12 is in a semi-closed processing space in a basin shape. On the one hand, the workpiece is in a low position, and the water and waste generated in the welding cooling process are not easy to splash out of the tool body 1, preventing pollution to the space where the device is located. On the other hand, the installation height of the spraying mechanism 2 is higher than the surface of the workpiece, which is convenient for forming the best spray angle, and the reflected water droplets can form atomized gas groups in the semi-closed processing space, further enhancing the cooling effect.

[0032] AsFigure 3 As shown, the bottom wall 101 of the flow guide groove 10 is a slope with a slope. The slope of the bottom wall 101 can be 3-5°, so that the waste water carrying waste debris maintains a certain self-flowing speed, avoids the deposition of waste debris, and maintains the effective volume of the flow guide groove 10.

[0033] The tool body 1 is also provided with a discharge port 13 communicating with the low-lying area of the flow guide groove 10, which can improve the waste liquid collection efficiency and cooperate with the subsequent filtering system to realize the recovery of waste debris and waste water.

[0034] The spraying mechanism 2 is arranged on the tool body 1, and the spraying mechanism 2 is used for providing gas cooling and spraying water mist to the welding position of the workpiece. It should be noted that during dissimilar material welding, high heat is usually generated, and intermetallic compounds are easily generated at high temperature, so cooling treatment is required.

[0035] In the embodiment, the spraying mechanism 2 includes a plurality of groups of air guns 21 arranged around the workpiece; the air cooling gas inlet end 211 of each group of air guns 21 is additionally provided with a shunt pipe 212 immersed in water, and when the air valve is opened, due to the principle of pressure, the water at the end of the shunt pipe 212 will be sucked out through the air pipe, so that the nozzle 213 of the air gun 21 forms a spray while spraying. In the embodiment, the air gun 21 is provided with eight groups, which are detachably arranged around the first boss 11, so as to ensure that a cooling curtain is formed in the weld area. The position of each group of air guns 21 and the angle of the nozzle 213 thereof can be adjusted individually, and it is suitable for workpieces of different sizes / shapes.

[0036] The valve can be arranged in the air gun 21 to adjust the air flow. The size of the water mist can also be adjusted by replacing shunt pipes 212 of different thicknesses and adjusting the pumping power.

[0037] In some embodiments, the spraying mechanism 2 can also directly use existing machine tool cooling sprayers, such as YS-BPV-3000, etc. Or air flow type sprayer, which converts liquid into fine droplets by using high-speed airflow and discharges them into the air.

[0038] The utility model discloses on the basis of gas cooling through the mode of spraying water mist by adding shunt pipe 212, compared with traditional mode, improve the cooling effect, solve the problem of not easy to form when dissimilar material welding. Through experimental test, the result indicates that in the dissimilar material welding process of aluminum magnesium, aluminum copper etc., the surface is easier to form, the internal metallographic has no defect, and the tensile strength is obviously improved.

[0039] The limiting mechanism 3 comprises elbow clamps 31 and a power source (not shown in the figure). The elbow clamps 31 are provided in plurality and are fixedly installed on the tool body 1, and the clamping heads 311 of the elbow clamps 31 can abut against the surface of the workpiece in the locked state to press the workpiece on the tool body 1. The elbow clamps 31 can provide continuous and stable locking force, and the multi-point clamping layout can ensure that the workpiece is uniformly stressed and kept horizontally stationary during the welding process, thereby ensuring the smooth progress of the friction stir welding process.

[0040] The power source is used to drive the handles 312 of the elbow clamps 31 to swing. In the embodiment, the power source can be a gas cylinder hinged on the tool body 1. The clamping action can be completed in a short time, and PLC control can be integrated to realize automation. The clamping action is triggered only when the limiting signal is triggered, and the clamping can be synchronized or asynchronous according to the time sequence.

[0041] The water tank 4 is communicated with the discharge outlet 13 through a water pipe; the liquid inlet end (i.e. the shunt pipe 212 on each air gun 21) of the spraying mechanism 2 is arranged in the water tank 4, so as to realize the recycling of water.

[0042] The discharge outlet 13 and / or the water tank 4 are provided with a filter screen 5, and a magnetic adsorption assembly can be further arranged on the filter screen 5, so as to reduce the metal scraps contained in the waste water. The waste liquid discharged from the tool body 1 can be reused by the spraying mechanism 2 after being filtered and cooled in multiple layers.

[0043] The cooling device has simple and convenient manufacturing process of overall structure and saves processing cost.

[0044] The above is only the preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all of them should be covered in the protection scope of the utility model.

Claims

1. Cooling device for use in a friction stir welding process, characterized in that The device comprises a tool body (1) and a spraying mechanism (2); the top of the tool body (1) is basin-shaped, and a workpiece is installed in the inner depression of the tool body (1); the spraying mechanism (2) is arranged around the workpiece on the tool body (1) and can spray cooling medium to the welding part of the workpiece; a flow guide groove (10) for collecting waste materials between the workpiece and the spraying mechanism (2) is further arranged on the tool body (1).

2. The cooling device for use in a friction stir welding process according to claim 1, characterized in that The projection of the flow guide groove (10) on the horizontal plane is in a closed loop shape, so as to divide the top of the tool body (1) from outside to inside into a first boss (11) for installing the spraying mechanism (2) and a second boss (12) for bearing the workpiece, and the first boss (11) and the second boss (12) have a height difference.

3. The cooling device for use in a friction stir welding process according to claim 2, characterized in that The bottom wall (101) of the flow guide groove (10) is a slope with a slope.

4. The cooling device for use in a friction stir welding process according to claim 2, wherein An exhaust port (13) is further arranged on the tool body (1) and communicates with the low-lying area of the flow guide groove (10).

5. The cooling device for use in a friction stir welding process according to any one of claims 1 to 4, characterized in that The spraying mechanism (2) comprises a plurality of groups of air guns (21) arranged around the workpiece; the air cooling gas inlet end (211) of each group of air guns (21) is additionally provided with a shunt pipe (212) immersed in water, so that the spray head (213) of the air gun (21) forms a spray while spraying by using pressure.

6. The cooling device for use in a friction stir welding process according to any one of claims 1 to 4, characterized in that A limiting mechanism (3) is further included; the limiting mechanism (3) comprises an elbow clamp (31) fixedly installed on the tool body (1), and the clamp head (311) of the elbow clamp (31) can abut against the surface of the workpiece in a locking state to press the workpiece on the tool body (1).

7. The cooling device for use in a friction stir welding process according to claim 6, characterized in that The limiting mechanism (3) further comprises a power source for swinging the handle (312) of the elbow clamp (31).

8. The cooling device for use in a friction stir welding process according to claim 4, wherein A water tank (4) communicating with the exhaust port (13) is further included; the liquid inlet end of the spraying mechanism (2) is arranged in the water tank (4) to realize water circulation.

9. The cooling device for use in a friction stir welding process according to claim 8, characterized in that A filter screen (5) is arranged in the exhaust port (13) and / or the water tank (4).

10. The cooling device for use in a friction stir welding process according to any one of claims 1 to 4, characterized in that The tool body (1) is a metal structure, and the surface has a blackened anti-rust layer.

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