Patent ID: 11872759
Assignee: SODICK CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  G  Y | IPC B

Claim 0:
1. A lamination molding apparatus, comprising:
a chamber, configured to cover a molding region; and
an irradiation device, configured to, in each divided layer formed by dividing a three-dimensional molded object at a predetermined height, irradiate a first laser beam and a second laser beam to a material layer formed in the molding region to form a solidified layer,
wherein the irradiation device comprises:
a first laser source, configured to generate the first laser beam;
a first galvano scanner, configured to scan the first laser beam;
a second laser source, configured to generate the second laser beam;
a second galvano scanner, configured to scan the second laser beam;
a third laser source, configured to generate a third laser beam;
a third galvano scanner, configured to scan the third laser beam;
a fourth laser source, configured to generate a fourth laser beam;
a fourth galvano scanner, configured to scan the fourth laser beam; and
an irradiation controller, configured to control the first laser source, the second laser source, the third laser source, the fourth laser source, the first galvano scanner, the second galvano scanner, the third galvano scanner and the fourth galvano scanner,
the first galvano scanner comprises:
a first X-axis galvano mirror, configured to scan the first laser beam in an X-axis direction;
a first X-axis actuator, configured to rotate the first X-axis galvano mirror;
a first Y-axis galvano mirror, configured to scan the first laser beam in a Y-axis direction perpendicular to the X-axis direction; and
a first Y-axis actuator, configured to rotate the first Y-axis galvano mirror, and
the second galvano scanner comprises:
a second X-axis galvano mirror, configured to scan the second laser beam in the X-axis direction;
a second X-axis actuator, configured to rotate the second X-axis galvano mirror;
a second Y-axis galvano mirror, configured to scan the second laser beam in the Y-axis direction; and
a second Y-axis actuator, configured to rotate the second Y-axis galvano mirror,
irradiable ranges of the first laser beam and the second laser beam by using the first galvano scanner and the second galvano scanner respectively include an entirety of the molding region, and
the first X-axis galvano mirror and the first Y-axis galvano mirror are disposed to be plane-symmetric to the second X-axis galvano mirror and the second Y-axis galvano mirror with respect to a symmetry plane which is perpendicular to the molding region, so that a distance between a first downstream galvano mirror and a second downstream galvano mirror is smaller than a distance between a first upstream galvano mirror and a second upstream galvano mirror, wherein
the first upstream galvano mirror is one of the first X-axis galvano mirror and the first Y-axis galvano mirror which is relatively disposed on upstream, and the first downstream galvano mirror is the other of the first X-axis galvano mirror and the first Y-axis galvano mirror which is relatively disposed on downstream, when a relative position close to the first laser source is set as upstream and a relative position close to the material layer is set as downstream along a path of the first laser beam;
the second upstream galvano mirror is one of the second X-axis galvano mirror and the second Y-axis galvano mirror which is relatively disposed on upstream, and the second downstream galvano mirror is the other of the second X-axis galvano mirror and the second Y-axis galvano mirror which is relatively disposed on downstream when a relative position close to the second laser source is set as upstream and a relative position close to the material layer is set as downstream along a path of the second laser beam; and
a distance between a first reflected position which is a reflected position of the first laser beam on the first downstream galvano mirror and a second reflected position which is a reflected position of the second laser beam on the second downstream galvano mirror is configured to be 150 mm or less,
wherein the reflected position of the first laser beam is a position where the first laser beam is reflected on the first downstream galvano mirror, and
the reflected position of the second laser beam is a position where the second laser beam is reflected on the second downstream galvano mirror,
the third galvano scanner comprises:
a third X-axis galvano mirror, configured to scan the third laser beam in the X-axis direction;
a third X-axis actuator, configured to rotate the third X-axis galvano mirror;
a third Y-axis galvano mirror, configured to scan the third laser beam in the Y-axis direction perpendicular to the X-axis direction; and
a third Y-axis actuator, configured to rotate the third Y-axis galvano mirror,
the fourth galvano scanner comprises:
a fourth X-axis galvano mirror, configured to scan the fourth laser beam in the X-axis direction;
a fourth X-axis actuator, configured to rotate the fourth X-axis galvano mirror;
a fourth Y-axis galvano mirror, configured to scan the fourth laser beam in the Y-axis direction; and
a fourth Y-axis actuator, configured to rotate the fourth Y-axis galvano mirror,
irradiable ranges of the third laser beam and the fourth laser beam by using the third galvano scanner and the fourth galvano scanner respectively include the entire entirety of the molding region, and
the third X-axis galvano mirror and the third Y-axis galvano mirror are disposed to be plane-symmetric to the fourth X-axis galvano mirror and the fourth Y-axis galvano mirror with respect to a symmetry plane which is perpendicular to the molding region, so that a distance between a third downstream galvano mirror and a fourth downstream galvano mirror is smaller than a distance between a third upstream galvano mirror and a fourth upstream galvano mirror, wherein
the third upstream galvano mirror is one of the third X-axis galvano mirror and the third Y-axis galvano mirror which is relatively disposed on upstream, and the third downstream galvano mirror is the other of the third X-axis galvano mirror and the third Y-axis galvano mirror which is relatively disposed on downstream, when a relative position close to the third laser source is set as upstream and a relative position close to the material layer is set as downstream along a path of the third laser beam;
the fourth upstream galvano mirror is one of the fourth X-axis galvano mirror and the fourth Y-axis galvano mirror which is relatively disposed on upstream, and the fourth downstream galvano mirror is the other of the fourth X-axis galvano mirror and the fourth Y-axis galvano mirror which is relatively disposed on downstream when a relative position close to the fourth laser source is set as upstream and a relative position close to the material layer is set as downstream along a path of the fourth laser beam; and
a distance between a third reflected position which is a reflected position of the third laser beam on the third downstream galvano mirror and a fourth reflected position which is a reflected position of the fourth laser beam on the fourth downstream galvano mirror is configured to be 150 mm or less,
wherein the reflected position of the third laser beam is a position where the third laser beam is reflected on the third downstream galvano mirror, and
the reflected position of the fourth laser beam is a position where the fourth laser beam is reflected on the fourth downstream galvano mirror;
wherein lamination molding apparatus further comprises:
a single casing, configured to accommodate the first galvano scanner, the second galvano scanner, the third galvano scanner, and the fourth galvano scanner,
the first galvano scanner, the second galvano scanner, the third galvano scanner, and the fourth galvano scanner are fixed on the single casing and arranged so that the first reflected position, the second reflected position, the third reflected position and the fourth reflected position are at a same height from the material layer.