Electric arc additive manufacturing forming device and method for controlling current alternating

Abstract

The invention relates to a control current alternating electric arc additive manufacturing forming device and method, and belongs to the field of welding / additive manufacturing. The device comprises a wire feeder I (1), a wire feeder II (2), a wire feeder III (3), a gas metal arc welding power supply (4), a controller (5), a substrate (6), a movement mechanism (7), a wire material I (8), a wire material II (9), a wire material III (10), a welding gun (11), a relay switch I (12), a relay switch II (13), a relay switch III (14), a relay switch IV (15), a relay switch V (16) and a relay switch VI (17). According to the device, an arc is formed by a gas metal arc welding power supply and any two intersected wires, heat generated by the arc is used for melting the wires, a relay switch is controlled by the gas metal arc welding power supply (4) and a controller (5), so that any two wires in the three wires are electrified to form a loop, a melting heat source is formed, and welding or additive manufacturing is completed. And meanwhile, the arc alternating form achieves the effects of stirring the molten pool to refine grains and reducing internal defects.

Description

Technical Field

[0001] The present invention specifically relates to a device and method for controlling current alternating arc additive manufacturing, and belongs to the field of additive manufacturing. Background Art

[0002] Additive Manufacturing (AM) is a manufacturing technology that forms solid components based on the principle of layer-by-layer accumulation of materials and deposits materials from the bottom up according to a three-dimensional model. Compared with traditional subtractive manufacturing (such as casting, forging, machining, etc.), AM technology has the advantages of high forming efficiency, high material utilization, simple process flow, and high flexibility. Depending on the heat source used, additive manufacturing is divided into three categories: wire and arc additive manufacturing (WAAM), laser additive manufacturing (LAM), and electron beam additive manufacturing (EBAM). Compared with other methods, wire and arc additive manufacturing technology has the advantages of high deposition rate, high flexibility, and high material utilization.

[0003] However, arc additive manufacturing has a large heat input, the molten pool stays for a long time, and the cooling is slow, which can easily make the internal structure of the parts coarse and uneven, and produce defects such as pores, cracks and element segregation. Existing research mostly uses a large number of experiments and numerical simulations to adjust process parameters such as arc voltage, current, welding speed and wire feeding speed to explore the best combination, reduce defects in arc additive manufacturing, and improve manufacturing quality and precision. However, conducting a large number of experiments requires a lot of materials, energy and time, and the experimental cost is high and the operation is inconvenient.

[0004] Therefore, there is an urgent need to develop a device with low cost and improved manufacturing precision. The present invention solves the related problems through a device and method for controlling current alternating arc additive manufacturing. The controller controls the relay switch to energize the wire to form an alternating arc, so that each wire is melted alternately to solve the problems of uneven distribution of the molten pool structure and internal defects. The method is simple to operate and low in cost. Summary of the invention

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a controlled current alternating arc additive manufacturing forming device, characterized in that: the device comprises a wire feeder I (1), a wire feeder II (2), a wire feeder III (3), a metal arc welding power source (4), a controller (5), a substrate (6), a motion mechanism (7), a wire material I (8), a wire material II (9), a wire material III (10), a welding gun (11), a relay switch I (12), a relay switch II (13), a relay switch III (14), a relay switch IV (15), a relay switch V (16), and a relay switch VI (17); the metal arc welding power source (4) is connected to the controller (5), three wire feeders and wires, and the three wires intersect at one point at any angle.

[0006] The controller (5) is connected to the relay switch and is used to control the power-on / power-off command signal of the wire and the wire feeding start / stop command signal; the wire feeder I (1) is connected to the wire I (8) and is used to feed the wire I (8) into the electric arc; the wire feeder II (2) is connected to the wire II (9) and is used to feed the wire II (9) into the electric arc; the wire feeder III (3) is connected to the wire III (10) and is used to feed the wire III (10) into the electric arc; the base plate (6) is connected to the motion mechanism (7) and is used to execute the motion trajectory in the arc additive manufacturing process.

[0007] Preferably, the wire material I (8) intersects with the wire material II (9) at a point, and the angle between the wire material I (8) and the wire material II (9) is α, and α is 0 to 360; the wire material II (9) intersects with the wire material III (10) at a point, and the angle between the wire material II (9) and the wire material III (10) is β, and β is 0 to 360; the wire material III (10) intersects with the wire material I (8) at a point, and the angle between the wire material III (10) and the wire material I (8) is γ, and γ is 0 to 360.

[0008] Preferably, the protective welding power source (4) is alternating current or direct current.

[0009] Preferably, the three wires may be made of different materials.

[0010] Preferably, the method is not limited to additive manufacturing, but can also be applied to the field of welding.

[0011] A method for controlling a current alternating arc additive manufacturing device, characterized by comprising the following steps:

[0012] Step 1: Start the controller (5) to set the power-on time (t), power-on current (I), power-on target, and wire feeding speed (v);

[0013] Step 2: Start the controller (5) and the gas shielded welding power source (4), and use the controller (5) to operate the relay switch to provide current to any two of the three wires, thereby generating an arc as the main heat source, and the power supply time is t. At the same time, start the wire feeder and motion mechanism of the other wire to transport the wire until the welding or additive manufacturing process is completed.

[0014] Preferably, the diameter of the wire is 0.5 to 2.5 mm, but is not limited to this size.

[0015] Preferably, the number of wires is not limited to three, but may be multiple wires.

[0016] Preferably, the wire feeding speed is 1-20 m / min.

[0017] Preferably, the power-on time t is 0 to 5S, and the power-on current I is 50 to 300A.

[0018] Compared with the existing arc additive manufacturing devices and methods, the device and method for controlling current alternating arc additive manufacturing described in the present invention illustrate that the present invention controls the power supply through a controller to energize the wire to form an alternating arc, so that each wire is melted alternately, which solves the problems of uneven tissue composition and internal defects of the additive manufacturing workpiece, and achieves the technical effect of uniform tissue composition of the additive manufacturing workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall schematic diagram of the device;

[0020] Figure 2 It is a partial schematic diagram of the device. DETAILED DESCRIPTION

[0021] A controlled current alternating arc additive manufacturing forming device, characterized in that the device comprises a wire feeder I (1), a wire feeder II (2), a wire feeder III (3), a metal arc welding power source (4), a controller (5), a substrate (6), a motion mechanism (7), a wire material I (8), a wire material II (9), a wire material III (10), a welding gun (11), a relay switch I (12), a relay switch II (13), a relay switch III (14), a relay switch IV (15), a relay switch V (16), and a relay switch VI (17); the metal arc welding power source (4) is connected to the controller (5), three wire feeders and wires, and the three wires intersect at one point at any angle. The controller (5) is connected to the gas shielded welding power source (4) and is used to control the wire power on / off command signal and the wire feeding start / stop command signal; the wire feeder I (1) is connected to the wire I (8) and is used to feed the wire I (8) into the arc; the wire feeder II (2) is connected to the wire II (9) and is used to feed the wire II (9) into the arc; the wire feeder III (3) is connected to the wire III (10) and is used to feed the wire III (10) into the arc; the substrate (6) is connected to the motion mechanism (7) and is used to execute the motion trajectory in the arc additive manufacturing process. The wire I (8) and the wire II (9) intersect at one point, and the angle between the wire I (8) and the wire II (9) is α, and α is 60. The wire II (9) and the wire III (10) intersect at one point, and the angle between the wire II (9) and the wire III (10) is β, and β is 60. The wire III (10) intersects with the wire I (8) at one point, and the angle between the wire III (10) and the wire I (8) is γ, and γ is 60. The gas shielded welding power source (4) is alternating current.

[0022] A method for controlling a current alternating arc additive manufacturing device, characterized by comprising the following steps:

[0023] Step 1: Start the controller (5) to set the power-on time (t), power-on current (I), power-on target, and wire feeding speed (v);

[0024] Step 2: The controller (5) operates the relay switch to energize the wires I (8) and II (9) to form an arc as the main heat source, and the wire III (10) is de-energized. The energization time is t1, and the wire feeder III (3) and the motion mechanism (7) are started until the energization ends;

[0025] Step 3: The controller (5) operates the relay switch to energize the wires II (9) and III (10) to form an arc as the main heat source. The wire I (8) is de-energized for a duration of t2, and the wire feeder I (1) and the motion mechanism (7) are started until the energization ends.

[0026] Step 4: The controller (5) operates the relay switch to energize the wires I (8) and III (10) to form an arc as the main heat source, and the wire II (9) is de-energized. The energization time is t3, and the wire feeder II (2) and the motion mechanism (7) are started until the energization ends;

[0027] Step 5: The controller (5) operates the relay switch to energize two of the three wires in turn, and the two wires form an arc until the additive manufacturing is completed.

[0028] The diameter of wire I (8) is 1 mm, the diameter of wire II (9) is 1 mm, and the diameter of wire III (10) is 1 mm. The number of wires is not limited to three, but may be multiple.

[0029] The power-on time t1 is 1S, the power-on time t2 is 1S, the power-on time t3 is 1S, and the power-on current I is 250A.

Claims

1. A controlled current alternating arc additive manufacturing device, characterized in that: The device comprises a wire feeder I (1), a wire feeder II (2), a wire feeder III (3), a metal arc welding power source (4), a controller (5), a base plate (6), a moving mechanism (7), a wire material I (8), a wire material II (9), a wire material III (10), a welding gun (11), a relay switch I (12), a relay switch II (13), a relay switch III (14), a relay switch IV (15), a relay switch V (16), and a relay switch VI (17); The metal arc welding power source (4) is connected to a controller (5), three wire feeders and wires, and the three wires intersect at one point at any angle.

2. The controller (5) is connected to the relay switch and is used to control the power-on / power-off command signal of the wire and the wire feeding start / stop command signal; The wire feeder I (1) is connected to the wire material I (8) and is used to feed the wire material I (8) into the arc; The wire feeder II (2) is connected to the wire material II (9) and is used to feed the wire material II (9) into the arc; The wire feeder III (3) is connected to the wire material III (10) and is used to feed the wire material III (10) into the arc; The base plate (6) is connected to the motion mechanism (7) and is used to execute the motion trajectory in the arc additive manufacturing process.

3. A controlled current alternating arc additive manufacturing device according to claim 1, characterized in that: The wire material I (8) and the wire material II (9) intersect at one point, and the angle between the wire material I (8) and the wire material II (9) is α, and α is 0 to 360; The wire II (9) and the wire III (10) intersect at one point, and the angle between the wire II (9) and the wire III (10) is β, and β is 0 to 360; The wire III (10) and the wire I (8) intersect at one point, and the angle between the wire III (10) and the wire I (8) is γ, and γ is 0 to 360 degrees.

4. A controlled current alternating arc additive manufacturing device according to claim 1, characterized in that: The protection welding power source (4) is alternating current or direct current.

5. A controlled current alternating arc additive manufacturing device according to claim 1, characterized in that: The three wires may be of different materials. This method is not limited to additive manufacturing but can also be applied to the field of welding.

6. A method for controlling a current alternating arc additive manufacturing device, characterized in that: The following steps are involved: Step 1: Start the controller (5) to set the power-on time (t), power-on current (I), power-on target, and wire feeding speed (v); Step 2: Start the controller (5) and the gas shielded welding power source (4), and use the controller (5) to operate the relay switch to provide current to any two of the three wires, thereby generating an arc as the main heat source, and the power supply time is t. At the same time, start the wire feeder and motion mechanism of the other wire to transport the wire until the welding or additive manufacturing process is completed.

7. A method for controlling alternating current arc additive manufacturing device according to claim 6, characterized in that: The wire diameter is 0.5 to 2.5 mm, but is not limited to this size.

8. A method for controlling alternating current arc additive manufacturing device according to claim 6, characterized in that: The number of wires is not limited to three, but may be multiple.

9. A method for controlling alternating current arc additive manufacturing device according to claim 6, characterized in that: The wire feeding speed is 1-20m / min.

10. A method for controlling alternating current arc additive manufacturing device according to claim 6, characterized in that: The power-on time t is 0 to 5S, and the power-on current I is 50 to 300A.

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