Method and system for manufacturing laminated shaped product

Patent metadata

Field	Value
Publication number	US-11273511-B2
Application number	US-201816495755-A
Country	US
Kind code	B2
Filing date	Feb 27, 2018
Priority date	Mar 27, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A method for producing an additively manufactured object includes melting and solidifying a filler metal by use of an arc, and depositing and forming a plurality of layers of molten beads to produce a built-up object, and the method includes: shaping the molten bead of a previous layer; and monitoring a temperature of the molten bead of the previous layer. Shaping of the molten bead of a next layer is started when the temperature of the molten bead of the previous layer is equal to or lower than an allowable interpass temperature.

First claim

The invention claimed is:

1. A method for producing an additively manufactured object, comprising melting and solidifying a filler metal by use of an arc, and depositing and forming a plurality of layers of molten beads to produce a built-up object,
the method comprising:
depositing the molten bead of a previous layer;
monitoring a temperature of the molten bead of the previous layer, wherein deposition of the molten bead of a next layer is started when the temperature of the molten bead of the previous layer is equal to or lower than an allowable interpass temperature, and
measuring a cooling time until the temperature of the molten bead of the previous layer is cooled down to the allowable interpass temperature from a temperature at a start of deposition,
wherein the total of a deposition time of the molten bead per layer and a travel time of a welding torch is set to be not less than the cooling time (tc).

2. The method for producing an additively manufactured object according to claim 1 ,
wherein a deposition time of the molten bead per layer is set to be not less than the cooling time.

3. The method for producing an additively manufactured object according to claim 2 , wherein the deposition time of the molten bead per layer is set to be the cooling time.

4. A method for producing an additively manufactured object, comprising melting and solidifying a filler metal by use of an arc, and depositing and forming a plurality of layers of molten beads to produce a built-up object, the method comprising:
depositing the molten bead;
monitoring a temperature of the molten bead; and
measuring a cooling time until the temperature of the molten bead is cooled down to an allowable interpass temperature from a temperature at a start of deposition,
wherein the number of welding torches in depositing the molten bead is set to an integer value of a quotient obtained by dividing a deposition time of the molten bead per layer by the cooling time.

5. The method for producing an additively manufactured object according to claim 2 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing while a heat input amount per unit length of the molten bead during the depositing is kept constant.

6. The method for producing an additively manufactured object according to claim 2 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing so that a cross-sectional area of the molten bead during the depositing is kept constant.

7. A system for producing an additively manufactured object, depositing and forming a plurality of layers of molten beads to produce a built-up object, the system comprising:
a deposition device configured to melt and solidify a filler metal by use of an arc based on layer profile data representing a profile of each layer obtained by dividing the built-up object into a plurality of mutually parallel layers, and deposit and form a plurality of layers of the molten beads;
a temperature sensor configured to measure a temperature of the molten bead every time the molten bead is formed; and
a control device configured to control the deposition device so that deposition of the molten bead of a next layer is started when a temperature of the molten bead of a previous layer is equal to or lower than an allowable interpass temperature, and
configured to measure a cooling time until the temperature of the molten bead of the previous layer is cooled down to the allowable interpass temperature from a temperature at a start of deposition,
wherein the total of a deposition time of the molten bead per layer and a travel time of a welding torch is set to be not less than the cooling time (tc).

8. The method for producing an additively manufactured object according to claim 3 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing while a heat input amount per unit length of the molten bead during the depositing is kept constant.

9. The method for producing an additively manufactured object according to claim 4 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing while a heat input amount per unit length of the molten bead during the depositing is kept constant.

10. The method for producing an additively manufactured object according to claim 3 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing so that a cross-sectional area of the molten bead during the depositing is kept constant.

11. The method for producing an additively manufactured object according to claim 4 ,
wherein the deposition time of the molten bead per layer is adjusted by changing at least one of current, voltage and welding speed during the depositing so that a cross-sectional area of the molten bead during the depositing is kept constant.

Assignees

• Kobe Steel Ltd

Inventors

• Sato Shinji
• Yamada Takeshi
• YAMASAKI Takemasa
• Okita Keisuke

Classifications

• B33Y10/00 Primary

  Processes of additive manufacturing · CPC title

• B22F12/90

  Means for process control, e.g. cameras or sensors · CPC title

• B22F12/45

  Two or more · CPC title

• B22F12/22

  Driving means · CPC title

• B22F10/36

  of energy beam parameters · CPC title