Additive manufacturing system and method for heterogeneous metal reinforced rod piece

Abstract

The invention discloses an additive manufacturing system for a dissimilar metal reinforced rod piece. The additive manufacturing system comprises a base, a first wire feeding assembly, a second wire feeding assembly, a preheating part and a welding part. The base can bear a rod piece; the first wire feeding assembly is used for supplying metal wires to the base body. The second wire feeding assembly is used for supplying heterogeneous metal wires; the preheating part is connected with the first wire feeding assembly and used for preheating the base metal wire. The welding part is used for generating heat and can melt the base metal wire to form a molten pool, and the heterogeneous metal wire is in a solid state and is wrapped in the molten pool. According to the additive manufacturing system for the dissimilar metal reinforced rod piece, additive manufacturing of the dissimilar metal reinforced rod piece can be met, and the forming quality and performance of the rod piece are improved. The invention further provides an additive manufacturing method of the heterogeneous metal reinforced rod piece.

Description

Technical Field

[0001] The present invention relates to the technical field of arc additive manufacturing, and in particular to an additive manufacturing system and method for heterogeneous metal reinforced rods. Background Art

[0002] Additive manufacturing technology is a bottom-up layer-by-layer manufacturing technology, which can theoretically produce various structures. For example, powder-based additive manufacturing technology is only suitable for preparing small-sized lattice structures. Compared with powder-based additive manufacturing technology, wire-feeding additive manufacturing technology has higher forming efficiency, and the materials and equipment are cheaper, and is more suitable for preparing large-sized lattice structures. Rods are the most basic units in the lattice structure, and their manufacturing quality and performance affect the overall performance of the lattice structure.

[0003] The existing method of preparing spatial rods by wire feeding additive manufacturing technology can usually only manufacture rods made of a single material metal, and the forming quality of the rods is poor, and various defects are inevitably present, resulting in poor performance and consistency of the rods. Summary of the invention

[0004] The purpose of the present invention is to provide an additive manufacturing system and method for heterogeneous metal reinforced rods to solve the problems existing in the above-mentioned prior art, meet the requirements of additive manufacturing of heterogeneous metal reinforced rods, and improve the forming quality and performance of the rods.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an additive manufacturing system for a heterogeneous metal reinforced rod, comprising a substrate, a first wire feeding assembly, a second wire feeding assembly, a preheating section and a welding section; the substrate can support the rod; the first wire feeding assembly is used to supply a base metal wire; the second wire feeding assembly is used to supply a heterogeneous metal wire; the preheating section is connected to the first wire feeding assembly and is used to preheat the base metal wire; the welding section is used to generate heat and can melt the base metal wire to form a molten pool, and the heterogeneous metal wire is in a solid state and is coated in the middle of the molten pool.

[0007] Preferably, the melting point of the heterogeneous metal wire is higher than the melting point of the base metal wire.

[0008] Preferably, the preheating part comprises a preheating power source, and the preheating power source can be electrically connected with the substrate and the base metal wire to form a loop, so that the base metal wire can be energized to generate heat.

[0009] Preferably, the first wire feeding assembly includes a first wire feeder and a first wire feeding nozzle, the first wire feeder is used to convey the base metal wire and guide the base metal wire through the first wire feeding nozzle; the preheating part is connected to the first wire feeding nozzle so as to be able to preheat the base metal wire between the first wire feeding nozzle and the molten pool.

[0010] Preferably, the second wire feeding assembly comprises a second wire feeder and a second wire feeding nozzle, and the second wire feeder is used for conveying the base metal wire and guiding the base metal wire through the second wire feeding nozzle.

[0011] Preferably, the welding part includes a shielding gas assembly, a welding power supply and an arc welding torch, wherein the welding power supply can power the arc welding torch so that the arc welding torch emits arc heat to melt the base metal wire to form a molten pool, and the welding power supply is electrically connected to the base; the shielding gas assembly is connected to the arc welding torch and can provide shielding gas.

[0012] Preferably, it also includes a control component, which can be communicatively connected with the first wire feeding assembly, the second wire feeding assembly, the preheating part and the welding part, and can perform control.

[0013] The present invention also provides an additive manufacturing method for heterogeneous metal reinforced rods, based on the additive manufacturing system for heterogeneous metal reinforced rods as described above, comprising the following steps:

[0014] Determine the processing path;

[0015] Determining processing parameters, the processing parameters including the wire feeding speed of the first wire feeding assembly, the wire feeding speed of the second wire feeding assembly, the heat input per unit time of the molten pool, the heat input per unit time of the preheating part, and the moving speed and heat input per unit time of the welding part;

[0016] The first wire feeding assembly, the second wire feeding assembly, the preheating unit and the welding unit are started to start additive manufacturing until the additive manufacturing of the rod is completed.

[0017] Preferably, the wire feeding speed of the second wire feeding assembly is the same as the moving speed of the welding portion, and the wire feeding speed of the first wire feeding assembly satisfies the following formula:

[0018]

[0019] Where: v 基 - Feeding speed of the matrix wire, d 基 -Diameter of the base wire, D -Rod diameter, S T -Torch moving speed, d 异 - Diameter of the heterogeneous wire.

[0020] Preferably, the preheating unit includes a preheating power supply, and the heat input per unit time H of the preheating unit is w Satisfies the following formula:

[0021]

[0022] Where: I w -Wire current, R w -Wire resistance between the front end of the first wire feeding assembly and the molten pool, ω-hot wire conduction rate, ζ-hot wire efficiency;

[0023] The welding part includes a welding power source and an arc welding torch, and the heat input per unit time H of the welding part a Satisfies the following formula:

[0024] H a =I a ×V a ×η

[0025] Where: I a -Average arc current, V a -Average arc voltage, η-arc torch efficiency;

[0026] Heat input per unit time of the molten pool H i Satisfies the following formula:

[0027] H i =H a +H w

[0028]

[0029] Where: A-molten pool surface area, h-molten pool surface heat transfer coefficient, Δt-molten pool surface and fluid average temperature difference; S-molten pool solid-liquid interface area, G-solid-liquid interface temperature gradient, K-molten pool material thermal conductivity, v 基 -Wire feeding speed of the matrix wire, ρ 基 - Room temperature density of the base metal wire, T 基 - Melting point of the base metal wire, T 0 - room temperature, C- specific heat capacity of matrix metal wire, H 基 - Latent heat of fusion of the base metal wire, T 异 - Melting point of heterogeneous metal wire.

[0030] Compared with the prior art, the present invention has achieved the following technical effects:

[0031] The additive manufacturing system and method of the heterogeneous metal reinforced rod provided by the present invention respectively supply a base metal wire and a heterogeneous metal wire through a first wire feeding assembly and a second wire feeding assembly, and melt the base metal wire through the heat provided by the welding part to form a molten pool, so that the heterogeneous metal material is coated between the molten pools and forms a heterogeneous metal reinforced rod after solidification; wherein the preheating part can preheat the base metal wire in advance before it reaches the welding part, reducing the heat required for the subsequent welding part to melt the base metal wire, thereby avoiding the welding part from melting the heterogeneous metal wire, so that the heterogeneous metal wire is not melted, there is no secondary processing manufacturing defect, and the influence of the manufacturing defects on the mechanical properties of the rod is reduced, and the heterogeneous metal wire can play a reinforcing role and improve the stability of the mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of heterogeneous metal reinforcement rods;

[0034] Figure 2 A schematic diagram of an additive manufacturing system for a heterogeneous metal reinforcement rod provided in Example 1;

[0035] Figure 3 A schematic diagram of an additive manufacturing method for a heterogeneous metal reinforcement rod provided in Example 2.

[0036] In the figure: 1-base; 11-workbench; 12-base plate; 2-first wire feeding assembly; 21-first wire feeder; 22-first wire feeding nozzle; 3-second wire feeding assembly; 31-second wire feeder; 32-second wire feeding nozzle; 4-preheating part; 41-preheating power supply; 5-welding part; 51-shielding gas assembly; 52-welding power supply; 53-arc welding torch; 6-base metal wire; 7-heterogeneous metal wire; 8-control component; 9-rod. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide an additive manufacturing system and method for heterogeneous metal reinforced rods to solve the problems existing in the above-mentioned prior art, meet the requirements of additive manufacturing of heterogeneous metal reinforced rods, and improve the forming quality and performance of the rods.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1

[0041] This embodiment provides an additive manufacturing system for heterogeneous metal reinforcement rods, see Figure 2 , including a base 1, a first wire feeding assembly 2, a second wire feeding assembly 3, a preheating part 4 and a welding part 5; the base 1 can carry a rod 9; the first wire feeding assembly 2 is used to supply a base metal wire 6; the second wire feeding assembly 3 is used to supply a heterogeneous metal wire 7; the preheating part 4 is connected to the first wire feeding assembly 2, and is used to preheat the base metal wire 6; the welding part 5 is used to generate heat and can melt the base metal wire 6 to form a molten pool, and the heterogeneous metal wire 7 is in a solid state and is coated in the middle of the molten pool.

[0042] The base metal wire 6 and the heterogeneous metal wire 7 are respectively supplied by the first wire feeding assembly 2 and the second wire feeding assembly 3, and the base metal wire 6 is melted by the heat provided by the welding part 5 to form a molten pool, so that the heterogeneous metal material is covered between the molten pools, and after solidification, a heterogeneous metal reinforcement rod 9 is formed. Figure 1 As shown; the preheating section 4 can preheat the base metal wire 6 before it reaches the welding section 5, reducing the heat required for the subsequent welding section 5 to melt the base metal wire 6, thereby avoiding the welding section 5 from melting the heterogeneous metal wire 7, so that the heterogeneous metal wire 7 is not melted, there is no secondary processing manufacturing defect, and the influence of manufacturing defects on the mechanical properties of the rod 9 is reduced, and the heterogeneous metal wire 7 can play a reinforcing role and improve the stability of the mechanical properties.

[0043] The base 1 includes a substrate 12 and a workbench 11 which are arranged in sequence from top to bottom. The substrate 12 serves as a carrier for the deposition and manufacturing of the rod 9; and the workbench 11 serves to support the entire device.

[0044] In the optional scheme of this embodiment, it is more preferred that the melting point of the heterogeneous metal wire 7 is higher than the melting point of the base metal wire 6; as a reinforcing material, the performance of the heterogeneous metal wire 7 is better than that of the base metal wire 6, and its melting point needs to be significantly higher than that of the base metal wire 6. The melting point of the heterogeneous metal wire 7 is generally above 200°C, so that when the base metal wire 6 is melted, the heterogeneous metal wire 7 still remains in a solid state; the heterogeneous metal wire 7 is embedded in the molten pool of the base metal wire 6 to achieve the function of reinforcing the rod 9; specifically, the base metal wire 6 is an aluminum alloy, and the heterogeneous metal wire 7 is stainless steel; or the base metal wire 6 is a stainless steel alloy, and the heterogeneous metal wire 7 is a titanium alloy.

[0045] In the optional scheme of this embodiment, it is more preferred that the preheating part 4 includes a preheating power supply 41, and the preheating power supply 41 can be electrically connected to the substrate 1 and the base metal wire 6 to form a loop, so that the base metal wire 6 can be energized to generate heat to heat the wire, thereby reducing the amount of heat required to be provided by the welding part 5, and avoiding the heat provided by the welding part 5 from melting the heterogeneous metal wire 7.

[0046] In the optional scheme of this embodiment, it is more preferred that the first wire feeding assembly 2 includes a first wire feeder 21 and a first wire feeding nozzle 22, the first wire feeder 21 is used to convey the base metal wire 6 and guide the base metal wire 6 through the first wire feeding nozzle 22, wherein the first wire feeder 21 can load the base metal wire 6, and the base metal wire 6 passes through the first wire feeding nozzle 22 for guided conveyance; the preheating part 4 is connected to the first wire feeding nozzle 22, that is, one electrode of the preheating power supply 41 is electrically connected to the conductive nozzle at the front end of the first wire feeding nozzle 22, and the other electrode of the preheating power supply 41 is electrically connected to the workbench 11, so as to form a loop to heat the base metal wire 6 between the conductive nozzle and the molten pool.

[0047] In the optional scheme of this embodiment, it is more preferred that the second wire feeding assembly 3 includes a second wire feeder 31 and a second wire feeding nozzle 32, and the second wire feeder 31 is used to convey the heterogeneous metal wire 7 and guide the heterogeneous metal wire 7 through the second wire feeding nozzle 32; wherein the second wire feeder 31 can load the heterogeneous metal wire 7, and the heterogeneous metal wire 7 passes through the second wire feeding nozzle 32 for guided conveyance.

[0048] In the optional scheme of this embodiment, it is more preferred that the welding part 5 includes a shielding gas component 51, a welding power supply 52 and an arc welding torch 53, i.e., a welding gun. The welding power supply 52 can power the arc welding torch 53 so that the arc welding torch 53 emits arc heat to melt the base metal wire 6 to form a molten pool, and the welding power supply 52 is electrically connected to the workbench 11 of the substrate 1 so that the arc current forms a loop; the shielding gas component 51 is connected to the arc welding torch 53 and can provide shielding gas, wherein the shielding gas component 51 includes a shielding gas storage tank connected to the arc welding torch 53, which provides shielding gas such as argon to the arc welding torch 53 for arc initiation and preventing oxidation of the molten pool.

[0049] In the optional scheme of this embodiment, it is more preferred that the additive manufacturing system of heterogeneous metal reinforced rods provided in this embodiment also includes a control component 8, which can be communicated and connected with the first wire feeding assembly 2, the second wire feeding assembly 3, the preheating part 4 and the welding part 5, and can perform control; wherein the control component 8 is configured as a numerical control system, which can control the wire feeding speed of the first wire feeding assembly 2 and the second wire feeding assembly 3, the moving speed of the arc welding torch 53, and the heat input of the preheating part 4 and the welding part 5; wherein the arc welding torch 53, the first wire feeding nozzle 22 and the second wire feeding nozzle 32 are fixedly connected, and are driven by an existing actuator, such as a machine tool or a robotic arm.

[0050] Embodiment 2

[0051] This embodiment provides an additive manufacturing method for a heterogeneous metal reinforced rod, based on the additive manufacturing system for a heterogeneous metal reinforced rod in the first embodiment, comprising the following steps:

[0052] Determine the processing path;

[0053] Determine processing parameters, including the wire feeding speed of the first wire feeding assembly 2, the wire feeding speed of the second wire feeding assembly 3, the heat input per unit time of the molten pool, the heat input per unit time of the preheating part 4, and the moving speed and heat input per unit time of the welding part 5;

[0054] The first wire feeding assembly 2 , the second wire feeding assembly 3 , the preheating unit 4 and the welding unit 5 are started to start additive manufacturing until the additive manufacturing of the rod 9 is completed.

[0055] Specifically, see Figure 3 First, the materials of the base metal wire 6 and the heterogeneous metal wire 7 are determined according to the needs, and the processing parameters are determined according to the materials. Then, the processing path is formed by G code programming according to the forming trajectory of the rod 9. At the same time, the fixed base plate 12 is installed to the workbench 11 and the parameters of each device are set. Then, each device deposits the rod 9. The deposition process is judged by human or computer recognition whether the deposition is completed, and the deposition steps are repeated until the deposition is completed, and then each device is closed.

[0056] The wire feeding speed of the second wire feeding assembly 3 is the same as the moving speed of the welding portion 5, and the wire feeding speed of the first wire feeding assembly 2 satisfies the following formula:

[0057]

[0058] Where: v 基 - Feeding speed of the matrix wire, d 基 -Diameter of the base wire, D -Rod diameter, S T -Torch moving speed, d异 -The diameter of the heterogeneous metal wire; by controlling the wire feeding speed of the base metal wire, it is possible to melt and form a molten pool and coat the heterogeneous metal wire.

[0059] The preheating unit 4 includes a preheating power supply 41, and the heat input per unit time H of the preheating unit 4 is w Satisfies the following formula:

[0060]

[0061] Where: I w -Wire current, R w -Wire resistance between the front end of the first wire feeding assembly, i.e., the conductive nozzle and the molten pool, ω-hot wire conduction rate, ζ-hot wire efficiency, usually a constant;

[0062] The welding part 5 includes a welding power source 52 and an arc welding torch 53. The heat input per unit time H of the welding part 5 is a Satisfies the following formula:

[0063] H a =I a ×V a ×η

[0064] Where: I a -Average arc current, V a -Average arc voltage, η-arc torch efficiency, usually a constant;

[0065] Heat input per unit time of the molten pool H i Satisfies the following formula:

[0066] H i =H a +H w

[0067]

[0068] Where: A-molten pool surface area, h-molten pool surface heat transfer coefficient, Δt-molten pool surface and fluid average temperature difference; S-molten pool solid-liquid interface area, G-solid-liquid interface temperature gradient, K-molten pool material thermal conductivity, v 基 -Wire feeding speed of the matrix wire, ρ 基 - Room temperature density of the base metal wire, T 基 - Melting point of the base metal wire, T 0 - room temperature, C- specific heat capacity of matrix metal wire, H 基 - Latent heat of fusion of the base metal wire, T 异 - Melting point of heterogeneous metal wire.

[0069] By making the heat input per unit time H iSatisfying the above formula ensures that the arc only melts the base metal wire material 6 but does not melt the heterogeneous metal wire material 7, thereby achieving the purpose of manufacturing the heterogeneous metal reinforcement rod.

[0070] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An additive manufacturing system for heterogeneous metal reinforced rods, characterized in that: include: a base, capable of carrying the rods; A first wire feeding assembly, used for supplying a base metal wire; A second wire feeding assembly is used for feeding a heterogeneous metal wire; a preheating unit connected to the first wire feeding assembly and used for preheating the base metal wire; and The welding part is used to generate heat and melt the base metal wire to form a molten pool, and the heterogeneous metal wire is in a solid state and is coated in the middle of the molten pool.

2. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: The melting point of the heterogeneous metal wire is higher than the melting point of the base metal wire.

3. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: The preheating part includes a preheating power source, and the preheating power source can be electrically connected with the substrate and the base metal wire to form a loop, so that the base metal wire can be energized to generate heat.

4. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: The first wire feeding assembly includes a first wire feeder and a first wire feeding nozzle, the first wire feeder is used to convey the base metal wire and guide the base metal wire through the first wire feeding nozzle; the preheating part is connected to the first wire feeding nozzle so as to be able to preheat the base metal wire between the first wire feeding nozzle and the molten pool.

5. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: The second wire feeding assembly includes a second wire feeding machine and a second wire feeding nozzle, wherein the second wire feeding machine is used to feed the base metal wire and guide the base metal wire through the second wire feeding nozzle.

6. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: The welding part includes a shielding gas assembly, a welding power source and an arc welding torch. The welding power source can supply power to the arc welding torch so that the arc welding torch emits arc heat to melt the base metal wire to form a molten pool, and the welding power source is electrically connected to the base; the shielding gas assembly is connected to the arc welding torch and can provide shielding gas.

7. The additive manufacturing system for heterogeneous metal reinforced rods according to claim 1, characterized in that: It also includes a control component, which can be communicatively connected with the first wire feeding assembly, the second wire feeding assembly, the preheating part and the welding part, and can perform control.

8. An additive manufacturing method for heterogeneous metal reinforced rods, characterized in that: The additive manufacturing system of the heterogeneous metal reinforced rod according to any one of claims 1 to 7 comprises the following steps: Determine the processing path; Determining processing parameters, the processing parameters including the wire feeding speed of the first wire feeding assembly, the wire feeding speed of the second wire feeding assembly, the heat input per unit time of the molten pool, the heat input per unit time of the preheating part, and the moving speed and heat input per unit time of the welding part; The first wire feeding assembly, the second wire feeding assembly, the preheating unit and the welding unit are started to start additive manufacturing until the additive manufacturing of the rod is completed.

9. The additive manufacturing method of heterogeneous metal reinforced rod according to claim 8, characterized in that: The wire feeding speed of the second wire feeding assembly is the same as the moving speed of the welding portion, and the wire feeding speed of the first wire feeding assembly satisfies the following formula: Where: v 基 - Feeding speed of the matrix wire, d 基 -Diameter of the base wire, D -Rod diameter, S T -Torch moving speed, d 异 - Diameter of the heterogeneous wire.

10. The additive manufacturing method of heterogeneous metal reinforced rod according to claim 8, characterized in that: The preheating unit includes a preheating power supply, and the unit time heat input H of the preheating unit w Satisfies the following formula: Where: I w -Wire current, R w -Wire resistance between the front end of the first wire feeding assembly and the molten pool, ω-hot wire conduction rate, ζ-hot wire efficiency; The welding part includes a welding power source and an arc welding torch, and the heat input per unit time H of the welding part a Satisfies the following formula: H a =I a ×V a ×η Where: I a -Average arc current, V a -Average arc voltage, η-arc torch efficiency; Heat input per unit time of the molten pool H i Satisfies the following formula: H i =H a +H w Where: A-molten pool surface area, h-molten pool surface heat transfer coefficient, Δt-molten pool surface and fluid average temperature difference; S-molten pool solid-liquid interface area, G-solid-liquid interface temperature gradient, K-molten pool material thermal conductivity, v 基 -Wire feeding speed of the matrix wire, ρ 基 - Room temperature density of the base metal wire, T 基 - melting point of the base metal wire, T0-room temperature, C-specific heat capacity of the base metal wire, H 基 - Latent heat of fusion of the base metal wire, T 异 - Melting point of heterogeneous metal wire.

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