High energy beam scanning path planning method, additive manufacturing method and device

Abstract

The invention relates to a high-energy beam scanning path planning method, an additive manufacturing method and a device, and relates to the technical field of additive manufacturing. The high-energy beam scanning path planning method includes: constructing a three-dimensional model of an additively manufactured part; slicing the three-dimensional model of the part in layers along the direction of printing and manufacturing, and extracting section profile data of each layer slice; according to the section profile data of each layer slice Obtain the contour line of each slice, and after the contour line is contracted inward or expanded outward, at least one continuous scan line is obtained; the scan line is randomly divided into N segments, and the length of each scan line segment is less than or equal to a preset value; Each scan line is numbered, and each scan line segment is scanned according to a preset numbered scanning sequence, wherein at least one scan line segment is spaced between two scan line segments scanned in succession. The invention improves the uniformity of heat distribution during additive manufacturing of thin-walled parts, reduces thermal stress, and prevents deformation and cracking of parts.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a high-energy beam scanning path planning method, an additive manufacturing method and an additive manufacturing device. Background technique [0002] High melting point metal materials, such as tungsten and tungsten alloys, molybdenum and molybdenum alloys, nickel-based superalloys, etc., have the characteristics of high melting point and boiling point, high hardness, low expansion coefficient, low vapor pressure, etc. There are important applications in industry and other extreme environment fields. However, due to the high melting point and low-temperature brittleness of high-melting-point metal materials such as tungsten and molybdenum, it is difficult to prepare them by common casting and machining methods. Usually, most parts made of refractory materials such as tungsten and molybdenum are prepared by powder metallurgy, but conventional sintered products hav...

AI Technical Summary

Problems solved by technology

At present, the most common melting scanning path is linear zigzag scanning. This scanning method can form dense parts better, but the temperature field distribution during the forming process is very uneven, resulting in a large temperature gradient. Under the action of thermal stress generated by a large temperature gradient, it is easy to cause deformation and cracking

There is also a point-scanning path planning method, but this method is usually only used for part delineation, which limits the contour accuracy or loose layer of the formed part, and in the point-scanning mode, the high-energy beam scans a single point and then quickly deflects to the next position Dotting, this method is very easy to impact and splash the powder spread at the predetermined position, and it is easy to cause "powder blowing" and other phenomena, resulting in poor forming quality or even the suspension of the forming process

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