Additive Manufacturing Scanning Direction Alternation
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Solution Overview
Problem
Existing additive manufacturing methods using energy beams to fuse powder layers result in uneven energy deposition due to asymmetrical loop shapes, leading to variations in energy distribution across the transverse direction, which can compromise manufacturing quality and efficiency.
Innovation Solution
A method and device that alternates the direction of loops between adjacent areas during scanning, ensuring that the energy beam travels in opposite directions for successive loops, thereby distributing energy more homogeneously without reducing manufacturing speed, using a combination of longitudinal and transverse oscillatory movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the energy beam scans in a circular mode with loops offset from each other in the longitudinal direction, then the molten pool is widened and fusion is achieved, but the energy deposition becomes uneven in the transverse direction with high energy near bases of facing loops and lower energy near tops
Solution Approach 1:
The patent inverts the scanning direction alternately between forward and return passes. By reversing the scanning direction on alternate passes, the asymmetrical energy deposition pattern is compensated, resulting in more uniform energy distribution across the transverse direction while maintaining the beneficial loop-shaped trajectory for molten pool widening
2Reliability
If the spot follows a trajectory with loops to widen the molten pool, then fusion effectiveness is improved, but energy is deposited more at the base of loops than at their top, creating energy variation
Solution Approach 1:
The patent implements periodic alternation of scanning direction between forward and return passes. This periodic action compensates for the asymmetrical energy deposition at loop bases versus tops, achieving uniform energy distribution while preserving the loop trajectory's effectiveness for molten pool widening and reliable fusion
3Productivity
If conventional scanning methods are used with forward and return directions, then manufacturing speed is maintained, but energy distribution remains uneven across the surface
Solution Approach 1:
The patent introduces curved loop trajectories instead of straight-line scanning paths. The loop-shaped trajectories widen the molten pool for effective fusion while the alternating direction compensation ensures uniform energy distribution, achieving both high manufacturing speed and precise energy distribution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves more uniform energy deposition across the powder layer, enhancing manufacturing quality while maintaining high execution speed, particularly suitable for materials like titanium, aluminum, inconel, and stainless steel.
Implementation Method 1
a source projects an energy beam onto the surface of the powder layer, at a spot where such fusion occurs
Implementation Method 2
To fuse a layer of powder, a source projects an energy beam onto the surface of the powder layer
Data Source
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AI summary
Disclosed is a method for the additive manufacture of an object from a powder layer, the method comprising steps of: projecting (200) an energy beam as a spot onto a surface of the layer; outward scanning (202) by the beam of a first zone of the surface in a longitudinal direction, and orientation of the beam so that the spot traverses the first zone along a path comprising first loops offset in the longitudinal direction, the spot traversing each first loop in a first direction of rotation; return scanning (204) by the beam of a second zone of the surface in the longitudinal direction, and orientation of the beam so that the spot traverses the second zone along a path comprising second loops offset in the longitudinal direction, the spot traversing each second loop in a second direction of rotation opposite the first direction of rotation.