KR-20260067862-A - Wire arc additive manufacturing equipment

KR20260067862AKR 20260067862 AKR20260067862 AKR 20260067862AKR-20260067862-A

Abstract

The present invention relates to a wire arc additive manufacturing apparatus capable of additively manufacturing a metal molded article using a three-dimensional printing method, comprising: a stage on which a three-dimensional molded article is additively molded; a printing module installed above the stage and additively molding the three-dimensional molded article by stacking a plurality of layers in the height direction on the stage by a wire arc additive manufacturing (WAAM) method; a cooling chamber module that forms a predetermined internal space to accommodate the stage and forms a cooling atmosphere in at least a part of the internal space to cool at least a part of the molded article being additively molded on the stage; and a control unit that applies a control signal to the cooling chamber module so as to adjust the height at which the cooling atmosphere is formed in the internal space of the cooling chamber module according to the height of the molded article being additively molded when the printing module is additively molding the molded article.

Inventors

김민기
김동윤
채유진
유지영
송정한

Assignees

한국생산기술연구원

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (16)

A stage where a three-dimensional object is laminated and molded; A printing module installed on the upper side of the above stage and additively molding the three-dimensional structure by stacking a plurality of layers in the height direction on the stage by a Wire Arc Additive Manufacturing (WAAM) method; A cooling chamber module that forms a predetermined internal space to accommodate the stage inside, and forms a cooling atmosphere in at least a portion of the internal space to cool at least a portion of the molded object laminated and molded on the stage; and A control unit that applies a control signal to the cooling chamber module so as to adjust the height at which the cooling atmosphere is formed in the internal space of the cooling chamber module according to the height of the mold being laminated when the printing module laminates the mold; A wire arc additive manufacturing device including
In Article 1, The above control unit is, A wire arc additive manufacturing apparatus that applies a control signal to a cooling chamber module so that, when the printing module additively molds the molded object, the cooling atmosphere can be formed up to a height lower than the height corresponding to the layer layer being additively molded by the printing module.
In Article 2, The above cooling chamber module is, A cooling chamber forming the internal space to accommodate the above stage; and A refrigerant supply unit connected to one side of the cooling chamber and injecting refrigerant into the internal space; A wire arc additive manufacturing device including
In Paragraph 3, The above control unit is, A printing information granting unit that receives printing information including information about the height of the layer layer being laminated molded by the above printing module; A level calculation unit that calculates a target level of the refrigerant to be injected into the cooling chamber based on the printing information above; and A refrigerant supply control unit that applies a control signal to the refrigerant supply unit so that the refrigerant can be injected into the cooling chamber up to the target water level calculated by the water level calculation unit; A wire arc additive manufacturing device including
In Article 4, The above target water level is, A wire arc additive manufacturing apparatus in which at least a portion of the remainder, excluding the top surface of the layer layer located immediately below the layer layer being additively molded, is at a level where it can be submerged in the refrigerant.
In Paragraph 3, The above refrigerant supply unit is, A refrigerant storage tank for storing the above refrigerant; A refrigerant supply line connected to one side of the cooling chamber and connecting the cooling chamber and the refrigerant storage tank; and A supply valve installed in the above refrigerant supply line to regulate the flow rate of the refrigerant supplied from the refrigerant storage tank to the cooling chamber; A wire arc additive manufacturing device including
In Paragraph 3, The above cooling chamber module is, A level sensor for sensing the level of the refrigerant injected into the internal space; A wire arc additive manufacturing device further comprising
In Paragraph 3, The above cooling chamber module is, A height sensor for sensing the height of the structure stacked on the stage; A wire arc additive manufacturing device further comprising
In Paragraph 3, The above cooling chamber module is, A temperature sensor for sensing the temperature of the refrigerant injected into the cooling chamber; and A heat exchanger that controls the temperature of the refrigerant based on the temperature of the refrigerant sensed by the temperature sensor so that the refrigerant injected into the cooling chamber can be maintained at a predetermined cooling temperature; A wire arc additive manufacturing device further comprising
In Paragraph 3, The above cooling chamber module is, A refrigerant discharge line connected to the other side of the cooling chamber to discharge the refrigerant injected into the cooling chamber to the outside; and A discharge valve installed in the refrigerant discharge line to control the flow rate of the refrigerant discharged through the refrigerant discharge line; A wire arc additive manufacturing device further comprising
In Article 10, A refrigerant recirculation module that recirculates the refrigerant discharged from the cooling chamber through the refrigerant discharge line to the refrigerant supply side; A wire arc additive manufacturing device further comprising
In Article 11, The above refrigerant recirculation module is, A drain tank for storing the refrigerant discharged through the above refrigerant discharge line; A recirculation line connecting the drain tank and the refrigerant storage tank of the refrigerant supply unit so as to recirculate the refrigerant stored in the drain tank to the refrigerant supply unit; A filter unit installed in the above recirculation line for separating foreign substances contained in the refrigerant; and A cooling unit installed in the above-mentioned recirculation line, which cools the refrigerant to a predetermined cooling temperature; A wire arc additive manufacturing device including
In Paragraph 3, The above cooling chamber module is, A lifting/lowering drive unit for raising and lowering the above stage in the height direction; A wire arc additive manufacturing device further comprising
In Article 13, The above control unit is, A refrigerant supply control unit that applies a control signal to the refrigerant supply unit so that the refrigerant can be injected into the internal space of the cooling chamber up to a predetermined liquid level; A printing information granting unit that receives printing information including information about the height of the layer layer being laminated molded by the above printing module; A height calculation unit that calculates the target height of the stage based on the printing information above; and A stage height adjustment unit that applies a control signal to the lifting/lowering drive unit so that the height of the stage can be adjusted to the target height calculated by the height calculation unit; A wire arc additive manufacturing device including
In Article 14, Raising the above goal, A wire arc additive manufacturing apparatus in which the printing module is at a height such that at least a portion of the remainder, excluding the top surface of the layer layer located immediately below the layer layer being additively molded, can be submerged in the refrigerant.
In Article 1, The above printing module is, A welding torch that generates an arc by applying current to a metal wire and melts the metal wire with the generated arc; and A shielding gas injection unit integrally formed on the outer side of the above welding torch and spraying shielding gas that surrounds the arc generated from the above welding torch; A wire arc additive manufacturing device including

Description

Wire arc additive manufacturing equipment The present invention relates to a wire arc additive manufacturing device, and more specifically, to a wire arc additive manufacturing device capable of additively manufacturing metal molded articles using a three-dimensional printing method. Using 3D printing-based manufacturing techniques, articles of various shapes are being produced easily and freely. However, existing 3D printing techniques have been applied only to the production of plastic articles and have not been utilized to produce metal additive articles. Recently, metal product manufacturing methods using 3D printing techniques such as Wire Arc Additive Manufacturing (WAAM) are being attempted. Wire Arc Additive Manufacturing allows for the free formation of metal additive articles by melting a metal wire with a plasma arc and stacking the additive beads using a 3D printing method. As such, wire arc additive manufacturing, which is considered to have high productivity in the metal 3D printing industry, is gaining attention. However, conventional wire arc additive manufacturing has a problem in that the overall additive process time increases because it is difficult to ensure robustness due to the temperature rise of the additively manufactured object during the additive manufacturing process, and thus time to cool the object during the process is essential. FIG. 1 is a schematic diagram schematically illustrating a wire arc additive manufacturing apparatus according to one embodiment of the present invention. Figure 2 is a schematic diagram illustrating the process of additive manufacturing of a three-dimensional object using the wire arc additive manufacturing device of Figure 1. Figure 3 is a schematic diagram showing the printing module of the wire arc additive manufacturing device of Figure 1. Figure 4 is a block diagram schematically showing the configuration of the control unit of the wire arc additive manufacturing device of Figure 1. FIG. 5 is a schematic diagram schematically illustrating a wire arc additive manufacturing apparatus according to another embodiment of the present invention. FIG. 6 is a schematic diagram schematically illustrating a wire arc additive manufacturing apparatus according to another embodiment of the present invention. Figure 7 is a schematic diagram illustrating the process of additive manufacturing of a three-dimensional object using the wire arc additive manufacturing device of Figure 6. FIG. 8 is a block diagram schematically showing the configuration of the control unit of the wire arc additive manufacturing device of FIG. 6. Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation. Hereinafter, embodiments of the present invention are described with reference to drawings that schematically illustrate ideal embodiments of the present invention. In the drawings, variations of the illustrated shapes may be expected, for example, depending on manufacturing techniques and/or tolerances. Accordingly, embodiments of the inventive concept should not be interpreted as being limited to specific shapes of the areas illustrated herein, but should include, for example, variations in shape resulting from manufacturing. FIG. 1 is a schematic diagram showing a wire arc additive manufacturing device (1000) according to one embodiment of the present invention, FIG. 2 is a schematic diagram showing the process of the wire arc additive manufacturing device (1000) of FIG. 1 adding and molding a three-dimensional object (10), FIG. 3 is a schematic diagram showing a printing module (100) of the wire arc additive manufacturing device (1000) of FIG. 1, and FIG. 4 is a block diagram showing the configuration of a control unit (400) of the wire arc additive manufacturing device (1000) of FIG. 1. First, as illustrated in FIG. 1, a wire arc additive manufacturing device (1000) according to one embodiment of the present invention may largely include a printing module (100), a stage (200), a cooling chamber module (300), and a control unit (400). As illustrated in FIG. 1, a three-dimensional mold (10) can be laminated and molded on the upper surface of the stage (200) by the printing module (100) to be described later. For example, the stage (200) is a type of block formed in the shape of a square, circular, or polygonal plate, and its upper surface may be formed flat