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JP-2026075828-A - Method for manufacturing objects using a metal 3D printer

JP2026075828AJP 2026075828 AJP2026075828 AJP 2026075828AJP-2026075828-A

Abstract

[Problem] To provide a method for manufacturing molded objects using a metal 3D printer that suppresses the generation of slag. [Solution] The manufacturing method of the present disclosure is a method for manufacturing a molded object using a metal 3D printer 1, and includes a molding step in which a molten tip is formed by the heat of an arc discharge ARC while supplying a shielding gas SG to the tip of a carbon steel wire WR, and the molten tip is laminated onto a target portion to form a molded object, wherein the arc discharge ARC is formed by applying a voltage between the carbon steel wire WR and the target portion and passing a current of 200 A or less, and the shielding gas SG is 100% argon gas. [Selection Diagram] Figure 4

Inventors

  • 中村 允哉
  • 加藤 涼太
  • 池田 雄一

Assignees

  • 株式会社大林組

Dates

Publication Date
20260511
Application Date
20241023

Claims (5)

  1. A method for manufacturing an object using a metal 3D printer, The process includes a molding step in which a shielding gas is supplied to the tip of a carbon steel wire, a molten tip is formed by the heat of an arc discharge, and the molten tip is laminated onto the target portion to form the object, The aforementioned arc discharge is formed by applying a voltage between the carbon steel wire and the target portion, thereby passing a current of 200 A or less. A manufacturing method in which the shielding gas is 100% argon.
  2. The manufacturing method according to claim 1, wherein the lamination is performed on the target portion at a temperature of 250°C or lower.
  3. The manufacturing method according to claim 1, wherein the carbon steel wire conforms to the AWS standard "A5.18 ER70S-G".
  4. The lamination is carried out in a manner according to any one of claims 1 to 3, wherein the heat input is in the range of 3,000 J/cm or more and 10,000 J/cm or less.
  5. The lamination is carried out by moving the carbon steel wire and the nozzle that supplies the shielding gas to the target portion at a speed within a predetermined range of movement speeds. The manufacturing method according to claim 4, wherein the predetermined range of the moving speed is 15 cm/min or more and 50 cm/min or less.

Description

This disclosure relates to a method for manufacturing objects using a metal 3D printer. Patent Document 1 discloses a metal 3D printer that melts a wire by arc discharge from the tip of the wire while supplying a shielding gas, and then builds up the molten material on the upper surface of a base plate. Japanese Patent Publication No. 2017-144447 This is a side view of a metal 3D printer according to an embodiment of the present disclosure.Figure 1 is a side view of the metal 3D printer with the nozzle removed from the manipulator.Figure 1 is a front view of the metal 3D printer with the nozzle removed from the manipulator.This is a schematic diagram illustrating the configuration of the nozzle in the embodiment of the present disclosure.This diagram schematically shows the state of a fabricated object created using 100% argon as the shielding gas.This diagram schematically shows the state of a fabricated object created under appropriate conditions with 100% argon as the shielding gas. The following describes in detail the embodiments for implementation (hereinafter referred to as "embodiments") with reference to the attached drawings. Throughout the description of the embodiments, the same elements are assigned the same numbers or reference numerals. <<Implementation>> The metal 3D printer 1 and the method for manufacturing a molded object M using the metal 3D printer 1 according to the embodiments of this disclosure will be described with reference to Figures 1 to 6. Figure 1 is a side view of a metal 3D printer 1 according to an embodiment of the present disclosure. Figure 2 is a side view of the metal 3D printer 1 shown in Figure 1 with the nozzle 6 removed from the manipulator 2. Figure 3 is a front view of the metal 3D printer 1 shown in Figure 1 with the nozzle 6 removed from the manipulator 2. <Metal 3D Printer 1> As shown in Figures 1 to 3, the metal 3D printer 1 comprises a manipulator 2, a base 3 for fixing the manipulator 2, a table 4 mounted on the base 3, a base material 5 provided on the table 4, and a nozzle 6 (see Figure 1) attached to the tip of the manipulator 2. The metal 3D printer 1 includes a wire supply mechanism for supplying carbon steel wire WR (not shown) to the nozzle 6, a gas supply mechanism for supplying shielding gas when melting the carbon steel wire WR (not shown) by arc discharge, and a power supply E for arc discharge. Although not shown in the illustration, the wire supply mechanism, gas supply mechanism, and power supply E can be general-purpose components used in metal 3D printers. [Manipulator 2] Manipulator 2 will be explained primarily with reference to Figures 2 and 3. The manipulator 2 comprises a manipulator base 21 fixed to the base portion 3, a swing head 22, a forearm portion 23, an upper arm portion 24, a wrist portion 25, and a swivel portion 26. (Manipulator base 21) The manipulator base 21 is a fixing part for securing the manipulator 2 to prevent it from tipping over, and is positioned on the base part 3 and fixed to the base part 3 with bolts B1. (Swinghead 22) As shown in Figure 2, the swing head 22 is pivotably connected to the manipulator base 21 around a first axis VA (see Figure 2) parallel to the vertical direction. (Lower arm part 23) As shown in Figure 2, the lower arm portion 23 is rotatably connected to the swing head 22 (see arrow AR1) with its base end being on a second axis parallel to the horizontal direction and perpendicular to the vertical direction, which serves as the pivot center RC1. (Upper arm 24) As shown in Figure 2, the upper arm portion 24 is rotatably connected to the lower arm portion 23 (see arrow AR2) with its base end having a third axis parallel to the second axis as the pivot center RC2. (Wrist part 25) The wrist portion 25 is connected to the tip of the upper arm portion 24 so that its base end can pivot (see arrow AR3 in Figure 3). (Swivel section 26) As shown in Figure 2, the swivel section 26 is provided at the tip of the wrist section 25 so as to be able to swivel (see arrow AR4) in one direction perpendicular to the longitudinal direction of the wrist section 25. Furthermore, the swivel unit 26 has a rotation mechanism (not shown) that rotates the attachment (in this example, the nozzle 6) attached to the swivel unit 26 relative to the swivel unit 26 (see arrow AR3 in Figure 3). [Base section 3] As shown in Figures 1 to 3, the base section 3 is a pedestal constructed by combining H-beams to securely hold the manipulator 2 and table 4. However, it is not limited to H-beams; any structure that can securely hold the manipulator 2 and table 4 in an appropriate positional relationship is acceptable. Furthermore, the underside of the base section 3 is equipped with casters (wheels) for transport and adjusters to prevent movement during use. [Table 4] The table 4 is mounted on the base 3 so as to be positioned at an appropriate distance from the manipulator 2, in order to properly create shapes using molten metal from the