Magnesium alloy electric arc additive manufacturing synchronous gas cooling device

Abstract

The utility model relates to the technical field of electric arc additive manufacturing, in particular to a magnesium alloy electric arc additive synchronous gas cooling device which comprises a synchronous gas cooling device body, a gas flow sensor, a controller and an electromagnetic gas valve. According to the synchronous gas cooling device, the distance between the gas nozzle and a welding gun, the vertical height of the gas nozzle, the angle of the gas nozzle and the flow of cooling gas can be adjusted, the shape of the gas nozzle and the gas type are changed, and then the interaction between the cooling gas and an electric arc and the cooling effect on a component are adjusted; the cooling mode is synchronous cooling along with the welding gun, the moving path of the welding gun is not affected, large-size and complex-structure magnesium alloy components can be manufactured, and the overall manufacturing efficiency is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of arc additive manufacturing, and in particular relates to a synchronous gas cooling device for arc additive manufacturing of magnesium alloys. Background Art

[0002] Compared with other metal materials, magnesium alloys have more prominent thermal sensitivity issues in the manufacturing process. When arc additive manufacturing magnesium alloy components, the arc heat source has a large heat input, and the additive manufacturing process accumulates heat seriously, making it very easy for arc additive manufacturing of magnesium alloy components to have formation defects such as flow, collapse, coarse grains, pores, and thermal cracks.

[0003] To address this problem, active cooling must be used to cool down magnesium alloy formed components in real time to reduce their thermal sensitivity. At present, the commonly used active cooling methods can be divided into two types: overall cooling of the bottom of the component and local synchronous cooling of the molten pool. Among them, the method of synchronous gas blowing cooling of the arc and the molten pool can cool both the local molten pool and the overall component, showing great application potential in magnesium alloy arc additive manufacturing. At present, although there are a small number of gas cooling devices suitable for arc additive manufacturing of other metal materials, their functions are limited, with few adjustable parameters and low degrees of freedom. They cannot solve the outstanding thermal sensitivity problem of magnesium alloy materials and are difficult to meet the research and development and application needs of synchronous gas cooling processes for magnesium alloy arc additive manufacturing.

[0004] Therefore, in order to solve the above problems, a synchronous gas cooling device for arc additive manufacturing of magnesium alloy is proposed. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of existing devices, the purpose of the utility model is to provide a synchronous gas cooling device for magnesium alloy arc additive manufacturing, which can realize active cooling of the local molten pool and the entire component during the magnesium alloy arc additive manufacturing process, and can achieve regulation of the cooling effect through multi-mode switching and multi-parameter adjustment, thereby meeting the research and development and application needs of the synchronous gas cooling process for magnesium alloy arc additive manufacturing.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a technical solution adopted by a synchronous gas cooling device for magnesium alloy arc additive manufacturing is: including a synchronous gas cooling device, an airflow sensor, a controller and an electromagnetic gas valve, the synchronous gas cooling device includes a horizontal adjustment table, a connecting plate, a slider, and a "b"-shaped air pipe, and the "b"-shaped air pipe includes a long straight pipe, a curved pipe, an inner pipe, a connecting pipe, and a gas nozzle.

[0009] The airflow sensor is connected to the protective gas circuit, the controller is connected to the signal output end of the airflow sensor, the electromagnetic valve is connected to the controller, the horizontal adjustment table is clamped on the welding gun, the connecting plate connects and fixes the two horizontal adjustment tables by riveting, the slider is passed through the horizontal adjustment table, and the "b"-shaped air pipe is passed through the central circular hole of the slider.

[0010] Preferably, the slider can slide left and right on the horizontal adjustment platform to adjust the horizontal distance between the air outlet and the welding gun, and the "b"-shaped air pipe can move up and down the central circular hole of the slider to adjust the vertical height of the air outlet;

[0011] Preferably, the inner tube passes through the connecting tube and is connected to the curved tube, and the connecting tube is connected to the gas nozzle. After the connecting tube and the gas nozzle are connected, they become one body and can rotate around the inner tube as an axis, thereby adjusting the angle between the gas outlet and the welding gun;

[0012] Preferably, the air nozzle of the "b"-shaped air pipe can be replaced with an air nozzle with a different shape of air outlet hole, thereby adjusting the diffusion surface of the cooling air being blown out.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a magnesium alloy arc additive manufacturing synchronous gas cooling device, which has the following beneficial effects.

[0015] 1. The overall structure of the utility model has a high degree of freedom and comprehensive adjustable parameters. The distance between the gas nozzle and the welding gun, the vertical height of the gas nozzle, the angle of the gas nozzle and the flow rate of the cooling gas can be adjusted, the shape of the gas nozzle and the type of gas can be changed, and the interaction between the cooling gas and the arc and the cooling effect on the component can be adjusted; the cooling method is synchronous cooling with the welding gun, which will not affect the moving path of the welding gun, and can manufacture large-sized and complex-structured magnesium alloy components, and ensure the overall manufacturing efficiency.

[0016] 2. In the utility model, by setting up a synchronous gas cooling device, a cooling gas flow is sprayed during the magnesium alloy arc additive manufacturing process to cool the magnesium alloy arc additive components, thereby reducing the heat accumulation of the components, making the macro-forming of the magnesium alloy components more uniform and smooth, and the structure more refined, so as to achieve shape control and property control of magnesium alloy arc additive manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A system diagram of a synchronous gas cooling device for arc additive manufacturing of magnesium alloys provided in an embodiment of the utility model; Figure 2 A three-dimensional schematic diagram of a synchronous gas cooling device provided by an embodiment of the utility model; Figure 3 A schematic diagram of the "b"-shaped trachea structure provided in an embodiment of the utility model.

[0018] In the figure: 1. welding gun; 2. cooling device; 21. horizontal slide; 22. connecting plate; 23. slider; 24. "b" shaped tube; 241. long straight tube; 242. curved tube; 243. inner tube; 244. connecting tube; 245. air nozzle; 3. air flow sensor; 4. controller; 5. solenoid valve; 6. protective gas; 7. cooling gas. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the present embodiment is introduced in conjunction with magnesium alloy arc additive manufacturing, this is not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can apply the present invention to arc additive manufacturing of other materials, etc.

[0020] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1 The utility model discloses a synchronous gas cooling device for arc additive manufacturing of magnesium alloy, comprising a synchronous gas cooling device 2, an air flow sensor 3, a controller 4, and an electromagnetic gas valve 5.

[0023] Wherein: before the synchronous gas cooling device cools the magnesium alloy arc additive component, the airflow sensor 3 is first connected to the protective gas circuit, and the other end is connected to the controller 4. The controller 4 receives the signal and controls the switch of the electromagnetic valve 5 according to the program. When the magnesium alloy arc additive program starts, the synchronous gas cooling device starts cooling.

[0024] See also Figure 2A synchronous gas cooling device for magnesium alloy arc additive manufacturing, the synchronous gas cooling device includes a horizontal adjustment table 21, a connecting plate 22, a slider 23, and a "b"-shaped tube 24.

[0025] The horizontal adjustment platform 21 is divided into two parts. The connecting plate 22 and the horizontal adjustment platform 21 are connected and clamped on the welding gun 1 by riveting. The two sliders 23 are respectively inserted into the left and right horizontal adjustment platforms 21. The "b"-shaped tube 24 is inserted into the central circular hole of the slider 23. There are two fixed threaded holes on the plane and cylindrical surface of the slider 23 respectively. The slider is fixed on the upper and lower positions of the horizontal adjustment platform 21 and the "b"-shaped tube 24 with screws.

[0026] See also Figure 3 A synchronous gas cooling device for arc additive manufacturing of magnesium alloy, wherein the “b”-shaped tube includes a long straight tube 241 , a curved tube 242 , an inner tube 243 , a connecting tube 244 , and a gas nozzle 245 .

[0027] The long straight tube 241 is connected to the upper end of the curved tube 242, the inner tube 243 passes through the connecting tube 244 and is connected to the lower end of the curved tube 242, and the air nozzle 245 is connected to the connecting tube 244. In this way, the long straight tube 241, the curved tube 242, the inner tube 243, the connecting tube 244, and the air nozzle 245 can be integrated, and the air nozzle 245 and the connecting tube 244 can rotate as a whole to adjust the air outlet angle, and the air nozzle 245 can be replaced with an air nozzle with an air outlet of different shapes.

[0028] The working principle of the utility model is: before the arc additive manufacturing, the synchronous gas cooling device 2 is installed, the slider 23 is adjusted to the predetermined position, the "b"-shaped tube 24 is adjusted to the predetermined position, the slider 23 and the "b"-shaped tube 24 are fixed with fixing screws, and the angle of the gas nozzle 245 is adjusted. When the magnesium alloy arc additive manufacturing program is run, the protective gas 6 is turned on, the airflow sensor 3 sends a signal, the controller 4 receives the signal, and controls the switch of the electromagnetic gas valve 5. When the welding gun 1 moves in the positive direction, according to the setting of the controller program, the electromagnetic gas valve 5 closes the negative direction gas path and opens the positive direction gas path. When the welding gun 1 moves in the negative direction, according to the setting of the controller program, the electromagnetic gas valve 5 closes the negative direction gas path and opens the positive direction gas path. According to the program setting of the controller 4, the electromagnetic valve 5 closes the positive direction gas path and opens the negative direction gas path, the welding gun 1 starts the arc for magnesium alloy arc additive manufacturing, and the synchronous gas cooling device 2 sprays gas, and the gas is sprayed onto the magnesium alloy component for heat dissipation, thereby reducing the heat accumulation of the magnesium alloy component and increasing the temperature gradient of the magnesium alloy component. The welding gun 1 extinguishes the arc after running to the preset position, and the welding gun 1 continues to move, and the synchronous gas cooling device 2 continues to spray gas to cool the remaining components. After cooling is completed, the electromagnetic valve 5 is closed. This is the working principle and working process of the synchronous gas cooling device for magnesium alloy arc additive manufacturing.

[0029] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A synchronous gas cooling device for arc additive manufacturing of magnesium alloys, characterized in that: The invention comprises a synchronous gas cooling device (2), an air flow sensor (3), a controller (4) and an electromagnetic gas valve (5); the synchronous gas cooling device (2) comprises a horizontal adjustment platform (21), a connecting plate (22), a slider (23), and a "b"-shaped gas pipe (24); the "b"-shaped gas pipe (24) comprises a long straight pipe (241), a curved pipe (242), an inner pipe (243), a connecting pipe (244), and a gas nozzle (245); The air flow sensor (3) is connected to the protective gas (6) gas path, the controller (4) is connected to the signal output end of the air flow sensor (3), the electromagnetic valve (5) is connected to the controller (4), the horizontal adjustment platform (21) is clamped on the welding gun (1), the connecting plate (22) connects and fixes the two horizontal adjustment platforms (21) by riveting, the slider (23) is inserted into the horizontal adjustment platform (21), and the "b"-shaped air pipe (24) is inserted into the central circular hole of the slider (23).

2. The synchronous gas cooling device for magnesium alloy arc additive manufacturing according to claim 1, characterized in that: The slider of the synchronous gas cooling device for magnesium alloy arc additive manufacturing can slide left and right on the horizontal adjustment table to adjust the horizontal distance between the air outlet and the welding gun, and the "b"-shaped gas pipe can move up and down in the central circular hole of the slider to adjust the vertical height of the air outlet.

3. The synchronous gas cooling device for magnesium alloy arc additive manufacturing according to claim 1, characterized in that: The inner tube of the "b"-shaped air pipe passes through the connecting tube and is connected to the curved tube, and the connecting tube is connected to the air nozzle. After the connecting tube and the air nozzle are connected, they become one body and can rotate around the inner tube as the axis, thereby adjusting the angle between the air outlet and the welding gun.

4. The synchronous gas cooling device for magnesium alloy arc additive manufacturing according to claim 1, characterized in that: The air nozzle of the "b"-shaped air pipe can be replaced with an air nozzle with a different shape of air outlet hole, thereby adjusting the diffusion surface of the cooling air blowing out.

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