Cylindrical Coordinate Additive Lathe for Support-Free Curved Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current additive manufacturing technologies face limitations in achieving complex curvatures and reducing support material needs, as they primarily rely on stacking 2.5D slices, leading to precision issues and the need for extensive support structures, especially for parts with vertical overhangs.
Innovation Solution
An additive lathe system that operates in cylindrical coordinates, using a rotating starter bar to deposit material, eliminating the need for vertical supports and improving circularity by building parts additively rather than subtractively, with a motor rig and extruder system controlled by steppers and a processor to apply material in cylindrical patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional FDM stacking of 2.5D slices is used, then manufacturing capability is provided, but manufacturing precision deteriorates due to staircase effect and containment problem
Solution Approach 1:
The patent inverts the traditional FDM approach by rotating the build plate horizontally and depositing material in cylindrical layers rather than stacking horizontal 2.5D slices vertically. This inversion eliminates the staircase effect on curved surfaces and removes the need for support structures, as material is deposited conformally to the rotating cylindrical surface.
Solution Approach 2:
The patent transitions from 2.5D Cartesian slicing to 3D cylindrical coordinate deposition. By using cylindrical coordinates (R, θ, z) instead of Cartesian (x, y, z) slicing, the system achieves continuous curved surfaces without stair-stepping and enables complex geometries without support structures.
2Ease of manufacture
If support structures are added for complex geometries, then ease of manufacture improves, but loss of substance increases due to additional material requirements
Solution Approach 1:
By inverting the build process to rotate the plate and deposit material cylindrically, the patent eliminates the need for support structures entirely. Material is deposited only where needed in the final geometry, achieving complex shapes without the material waste associated with support structures that must be added and then removed.
3Manufacturing precision
If vertical extruder head movement is used, then ease of operation is maintained, but manufacturing precision deteriorates for curved surfaces
Solution Approach 1:
The patent inverts the traditional approach by making the build plate rotate horizontally instead of moving the extruder head vertically. The extruder deposits material onto the rotating cylindrical surface, which naturally produces high circularity parts. The control system translates vertical layer heights into cylindrical coordinate deposits, maintaining operational simplicity while achieving superior circularity.
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 system enhances the quality of round and cylindrical parts by achieving higher circularity and reducing support material requirements, allowing for easier part removal and smoother finishes without the need for scraping or dissolvable supports.
Implementation Method 1
a heating device may also be provided that is disposed adjacent to the blank to apply heat to the extruder material as the blank is rotated
Implementation Method 2
an additive lathe includes a blank of round stock, an extruder, a motor rig having a theta axis stepper that controls rotation of the blank around a theta axis
Data Source
AI summary
An additive lathe integrates the advantages of additive manufacturing (also called 3d printing) with the cylindrical motion of a lathe to reduce material waste, print times, and increase creative potential. A post-processing system allows for an improved surface finishing on parts. The additive lathe no longer prints in cartesian (X, Y, Z) coordinates as other 3D printers and instead prints using cylindrical (R, Theta, Z) coordinates. The traditional bed or build plate is replaced with a horizontal cylindrical starter bar, on which 3D printed material is deposited along and around the bar. Essentially, the additive lathe works like a conventional lathe, but in reverse. Instead of taking a cylinder and slowly removing material as the part spins, the additive lathe adds material along and around the bar iteratively building up the part. The finishing mechanism allows for the creation of a smooth outer finish on printed parts while still in the printer.