Method and device for manufacturing shaped objects

Patent metadata

Field	Value
Publication number	US-11400535-B2
Application number	US-201816763182-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Nov 15, 2017
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

A method for producing a built-up object, includes: producing maps beforehand, the maps indicating bead heights BH and bead widths BW corresponding to a base-surface inclination angle θ and a track inclination angle φ, in which the base-surface inclination angle is an angle between a base surface on which the weld beads are to be formed and a vertical direction, and the track inclination angle is an angle between a track direction of the torch and a vertical direction on the base surface; selecting a bead height BH0 and a bead width BW0 from the maps correspondingly to the base-surface inclination angle θ and the track inclination angle φ in forming a weld bead on the base surface; and forming the weld bead based on the selected bead height BH0 and bead width BW0.

First claim

The invention claimed is:

1. A method for producing a built-up object by melting and solidifying a filler metal, thereby forming weld beads with a torch, the method comprising:
producing maps beforehand, each of the maps indicating a bead height BH and a bead width BW corresponding to a base-surface inclination angle θ and a track inclination angle φ, wherein the base-surface inclination angle is an angle between a base surface on which the weld beads are to be formed and a vertical direction, and the track inclination angle is an angle between a track direction along which the torch moves on the base surface and a vertical direction;
selecting a bead height BH 0 and a bead width BW 0 from one of the maps correspondingly to the base-surface inclination angle θ and the track inclination angle φ in forming a weldbead on the base surface; and
forming the weld bead based on the selected bead height BH 0 and bead width BW 0 .

2. The method for producing a built-up object according to claim 1 , the method comprising:
measuring a surface profile of an already deposited weld bead before the formation of the weld bead, thereby determining an actual value θ m of the base-surface inclination angle and an actual value φ m of the track inclination angle, the actual values θ m and φ m corresponding to the bead height BH 0 and the bead width BW 0 ;
calculating a corresponding bead height BH 1 and a corresponding bead width BW 1 which correspond to the actual values θ m and φ m from the maps;
determining the difference BH 0 -BH 1 between the bead height BH 0 , which has been selected in forming the weld bead, and the corresponding bead height BH 1 , and the difference BW 0 -BW 1 between the bead width BW 0 , which has been selected in forming the weld bead, and the corresponding bead width BW 1 ;
adding the determined differences respectively to the bead height BH 0 and the bead width BW 0 , thereby determining a corrected bead height BH 2 and a corrected bead width BW 2 ,
determining a corrected base-surface inclination angle θ and a corrected track inclination angle φ which respectively correspond to the corrected bead height BH 2 and the corrected bead width BW 2 from the maps; and
forming the weld bead based on the determined corrected base-surface inclination angle θ and corrected track inclination angle φ.

3. The method for producing a built-up object according to claim 1 , wherein in melting and solidifying the filler metal with an arc to form the weld bead, a travelling speed of the torch and a current value for generating the arc are controlled, thereby forming the weld bead based on the bead height and bead width selected from the maps.

4. The method for producing a built-up object according to claim 2 , wherein in melting and solidifying the filler metal with an arc to form the weld bead, a travelling speed of the torch and a current value for generating the arc are controlled, thereby forming the weld bead based on the bead height and bead width selected from the maps.

5. The method for producing a built-up object according to claim 1 , comprising depositing the weld beads, thereby forming the built-up object.

6. The method for producing a built-up object according to claim 1 , wherein in producing the maps, relationships of the bead height BH and the bead width BW with respect to the base-surface inclination angle θ and the track inclination angle φ are determined using cos θ sin φ as an index of a gravitational influence on the weld bead.

7. The method for producing a built-up object according to claim 5 , wherein in producing the maps, relationships of the bead height BH and the bead width BW with respect to the base-surface inclination angle θ and the track inclination angle φ are determined using cos θ sin φ as an index of a gravitational influence on the weld bead.

8. The method for producing a built-up object according to claim 6 , the method comprising:
measuring a surface profile of an already deposited weld bead before the formation of the weld bead, thereby determining an actual value θ m of the base-surface inclination angle and an actual value φ m of the track inclination angle;
calculating a value of cos θ m sin φ m before the formation of the weld bead; and
performing a feedback control of reducing a heat input for the weld bead in a case where the calculated value of cos θ m sin φ m is larger than a value of cos θ sin φ calculated from the base-surface inclination angle θ and track inclination angle φ having been selected from the maps.

9. The method for producing a built-up object according to claim 7 , the method comprising:
measuring a surface profile of an already deposited weld bead before the formation of the weld bead, thereby determining an actual value θ m of the base-surface inclination angle and an actual value φ m of the track inclination angle;
calculating a value of cos θ m sin φ m before the formation of the weld bead; and
performing a feedback control of reducing a heat input for the weld bead in a case where the calculated value of cos θ m sin φ m is larger than a value of cos θ sin φ calculated from the base-surface inclination angle θ and track inclination angle φ having been selected from the maps.

10. An apparatus for producing a built-up object by melting and solidifying a filler metal to form weld beads, thereby producing the built-up object including the weld beads on a base surface, the apparatus comprising:
a torch configured to form the weld beads;
a moving mechanism configured to move the torch relatively to the base surface;
a memory unit configured to store maps, each map indicating a bead height and a bead width corresponding to a base-surface inclination angle and a track inclination angle, wherein the base-surface inclination angle is an angle between the base surface and the vertical direction and the track inclination angle is an angle between a track direction along which the torch moves on the base surface and a vertical direction; and
a control unit configured to select, in forming a weld bead on the base surface, a bead height and a bead width from one of the maps in the memory unit correspondingly to the base-surface inclination angle and the track inclination angle, and control the moving mechanism and the torch, thereby forming the weld bead.

11. The apparatus for producing a built-up object according to claim 10 , wherein the control unit is configured to control, in forming the weld bead by melting and solidifying the filler metal with an arc, a travelling speed of the torch and a current value for generating the arc, such that the weld bead is formed based on the bead height and bead width selected from the maps.

12. The apparatus for producing a built-up object according to claim 10 , wherein in the maps, relationships of the bead height and the bead width with respect to the base-surface inclination angle θ and the track inclination angle φ are determined using cos θ sin φ as an index of a gravitational influence on the weld bead.

Assignees

• Kobe Steel Ltd

Inventors

• YAMASAKI Takemasa
• Sato Shinji
• Yamada Takeshi
• Fujii Tatsuya

Classifications

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B23K9/0953

  using computing means · CPC title

• B23K26/70

  Auxiliary operations or equipment · CPC title

• B22F10/30

  Process control · CPC title

• B23K15/02

  Control circuits therefor · CPC title