Method for manufacturing three-dimensional shaped object

Patent metadata

Field	Value
Publication number	US-9707622-B2
Application number	US-201515123101-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Mar 5, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

There is provided a selective laser sintering method capable of reducing the bulge of the peripheral portion corresponding to the periphery of the three-dimensional shaped object. The manufacturing method according to an embodiment of the present invention includes alternate repetition of a powder-layer forming and a solidified-layer forming, the repetition comprising: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby sintering the powder in the predetermined portion or a melting and subsequently solidifying the powder; and (ii) forming another solidified layer by newly forming a powder layer on the formed solidified layer, followed by irradiation of a predetermined portion of the newly formed powder layer with the light beam, wherein a scanning of the light irradiation is divided into light beam-scannings “A” and “B”.

First claim

The invention claimed is:

1. A method for manufacturing a three-dimensional shaped object by alternate repetition of a powder-layer forming and a solidified-layer forming, the repetition comprising:
(i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification of the powder; and
(ii) forming another solidified layer by newly forming a powder layer on the formed solidified layer, followed by irradiation of a predetermined portion of the newly formed powder layer with the light beam,
wherein a scanning of the light irradiation is divided into light beam-scannings “A” and “B”, the light beam-scanning “A” being for the light irradiation of a peripheral portion corresponding to a periphery of the three-dimensional shaped object, the light beam-scanning “B” being for the light irradiation of an internal portion corresponding to a region of the three-dimensional shaped object, the region being located inside the periphery, and
wherein a relative adjustment of a peak power “P” between the light beam-scannings “A” and “B” is performed such that a peak power P A of the light beam for the peripheral portion is lower than a peak power P B of the light beam for the internal portion.

2. The method according to claim 1 , wherein the light beam is scanned such that the light beam-scanning “B” is performed prior to the light beam-scanning “A”.

3. The method according to claim 1 , wherein the light beam in the light beam-scanning “A” is scanned such that a plurality of irradiation paths in an annular form are adjacent to each other along the peripheral portion.

4. The method according to claim 1 , wherein the light beam in the light beam-scanning “A” is scanned such that a plurality of irradiation paths in a linear form are in parallel with each other at the peripheral portion.

5. The method according to claim 1 , wherein the relative adjustment of the peak power “P” is performed such that an output of the light beam is relatively changed between the light beam-scannings “A” and “B”.

6. The method according to claim 1 , wherein the relative adjustment of the peak power “P” is performed such that d spot diameter of the light beam is relatively changed between the light beam-scannings “A” and “B”.

7. The method according to claim 1 , wherein an energy density of the light beam is the same between the light beam-scannings “A” and “B”.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Takenami Masataka
• Abe Satoshi
• Matsumoto Isamu

Classifications

• B29C64/153 Primary

  using layers of powder being selectively joined, e.g. by selective laser sintering or melting · CPC title

• B22F12/49

  Scanners · CPC title

• B22F12/44

  characterised by the configuration of the radiation means · CPC title

• B22F10/50

  Treatment of workpieces or articles during build-up, e.g. treatments applied to fused layers during build-up · CPC title

• B22F10/366

  Scanning parameters, e.g. hatch distance or scanning strategy · CPC title