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KR-20260067861-A - Wire-Arc Additive Manufacturing-Forging Hybrid Forming Method

KR20260067861AKR 20260067861 AKR20260067861 AKR 20260067861AKR-20260067861-A

Abstract

The present invention relates to a wire arc additive manufacturing-forging hybrid forming method capable of forming a metal molded product with high shape precision, and may include a preforming step of forming a preformed product of a predetermined shape on a stage by stacking molten metal wires on a stage using a 3D printing device of the wire arc additive manufacturing (WAAM) method, a stage transfer step of transferring and mounting the stage on which the preformed product is formed to a forging die, and a main forming step of forging the preformed product formed on the stage with the forging die to form a final molded product having a final target shape.

Inventors

  • 김민기
  • 채유진
  • 김동윤
  • 송정한

Assignees

  • 한국생산기술연구원

Dates

Publication Date
20260513
Application Date
20241106

Claims (14)

  1. A pre-forming step of forming a pre-formed product of a predetermined shape on a stage by depositing molten metal wire onto the stage using a 3D printing device of the Wire Arc Additive Manufacturing (WAAM) method; A stage transfer step for transferring and mounting the stage on which the above-mentioned preform is formed to a forging die; and A main forming step in which the preform formed on the stage is forged using the above forging die to form a final formed product having a final target shape (Net Shape Forming); A wire arc additive manufacturing-forging hybrid forming method comprising
  2. In Article 1, In the above stage transfer step and the above main forming step, the forging die is, A first mold having a first cavity space having a shape corresponding to the stage so that the stage can be seated; and A second mold formed to be opposite to the first mold in the vertical direction, installed to be movable up and down toward the first mold, and having a second cavity space formed with a shape corresponding to the final target shape so as to enable forging the pre-molded product formed on the stage into the final molded product; A wire arc additive manufacturing-forging hybrid forming method comprising
  3. In Article 2, In the above pre-forming step, the 3D printing device, A welding torch that applies current to the metal wire to generate an arc 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-forging hybrid forming method comprising
  4. In Paragraph 3, The above pre-forming step is, A 3D printing step of generating an arc by applying current to the metal wire supplied onto the stage through the welding torch, and depositing the metal wire melted by the generated arc onto the stage to form the preform having a 3D shape; and A volume sensing step for sensing the volume of the preform being formed on the stage; A wire arc additive manufacturing-forging hybrid forming method comprising
  5. In Article 4, In the above volume sensing step, A wire arc additive manufacturing-forging hybrid forming method that detects the volume of the preform being formed on the stage by means of a plurality of vision cameras installed on the upper side of the stage.
  6. In Article 4, In the above volume sensing step, A wire arc additive manufacturing-forging hybrid forming method that measures the weight of the stage on which the preform is formed and detects the volume of the preform formed on the stage.
  7. In Article 4, In the above preliminary molding step, A wire arc additive manufacturing-forging hybrid forming method that terminates the 3D printing step when the volume of the preform detected in the volume detection step reaches a predetermined target volume.
  8. In Article 7, The above predetermined target volume is, A wire arc additive manufacturing-forging hybrid forming method having the same volume as the final molded product formed in the above forming step.
  9. In Article 7, The above predetermined target volume is, A wire arc additive manufacturing-forging hybrid forming method having a volume that exceeds the volume of the final molded product formed in the above-mentioned forming step by a predetermined ratio.
  10. In Article 9, In the above main molding step, the second mold is, A wire arc additive manufacturing-forging hybrid forming method, wherein an overflow space is formed on one side of the second cavity space with a volume corresponding to the excess volume of the preform relative to the volume of the final molded product.
  11. In Article 10, After the above main molding step, A trimming step for trimming the overflow portion of the above-mentioned final molded product; A wire arc additive manufacturing-forging hybrid forming method further comprising
  12. In Article 2, Prior to the above main molding step, A heating step of heating the stage seated in the first cavity space of the first mold to heat the pre-molded product formed on the stage to a predetermined heating temperature; A wire arc additive manufacturing-forging hybrid forming method further comprising
  13. In Article 12, The above-mentioned first mold is, A heating unit for heating the stage seated in the first cavity space; A wire arc additive manufacturing-forging hybrid forming method comprising
  14. In Article 13, The above heating unit is, An induction heating coil formed on the lower side of the first cavity space or formed to surround the first cavity space so as to heat the stage seated in the first cavity space through an induction heating method; A wire arc additive manufacturing-forging hybrid forming method comprising

Description

Wire-Arc Additive Manufacturing-Forging Hybrid Forming Method The present invention relates to a wire arc additive manufacturing-forging hybrid forming method, and more specifically, to a wire arc additive manufacturing-forging hybrid forming method capable of manufacturing a shaped metal product with high shape precision. 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 is gaining attention in the metal 3D printing industry for its high productivity. However, as it is a close-form manufacturing method with low shape precision, there was a problem in that products formed by the conventional wire arc additive manufacturing method required additional post-processing, such as machining, to ensure shape precision. Furthermore, when machining is added as a post-processing step, the material yield decreases, and the machining process takes an excessive amount of time, leading to increased product production costs. FIG. 1 is a flowchart showing the sequence of a wire arc additive manufacturing-forging hybrid forming method according to one embodiment of the present invention. FIGS. 2 to 8 are schematic diagrams schematically illustrating each step of the wire arc additive manufacturing-forging hybrid forming method of FIG. 1. FIG. 9 is a flowchart showing a wire arc additive manufacturing-forging hybrid forming method in sequence according to another embodiment of the present invention. FIGS. 10 to 12 are schematic diagrams schematically illustrating each step of the wire arc additive manufacturing-forging hybrid forming method of FIG. 9. 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 flowchart showing a wire arc additive manufacturing-forging hybrid forming method according to one embodiment of the present invention in sequence, and FIGS. 2 to 8 are schematic diagrams showing each step of the wire arc additive manufacturing-forging hybrid forming method of FIG. 1. As illustrated in FIG. 1, a wire arc additive manufacturing-forging hybrid forming method according to one embodiment of the present invention may largely be performed in the order of a preliminary forming step (S100), a stage transfer step (S200), a heating step (S300), and a main forming step (S400). As illustrated in FIGS. 1 to 3, in the pre-forming step (S100), molten metal wire (W) can be stacked on a stage (10) by a 3D printing device of the Wire Arc Additive Manufacturing (WAAM) method to form a pre-formed product (1) of a predetermined shape on the stage (10). For example, the pre-forming step (S100) may include a three-dimensional printing step (S110) in which an arc (111) is generated by applying current to a metal wire (W) supplied onto a stage (10) through a welding torch (110), and the metal wire (W) melted by the generated arc (111) is sequentially stacked in the height direction onto the stage (10) to form a pre-formed product (1) of a three-dimensional shape, and a volume sensing step (S120) in which the volume of the pre-formed product (1) being stacked and formed onto the stage (10) is sensed. More specifically, in the three-dimensional printing step (S110) of the pre-forming step (S100), the three-dimensional printing device may include a welding torch (110) that appli