Ball Joint Calibration for Stereolithography Build Platform
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Solution Overview
Problem
In stereolithographic 3D printing, achieving precise parallel orientation of the build platform with respect to the exposure arrangement and determining the zero level for accurate 'bottom-up' fabrication is challenging due to the need for precise alignment and risk of collision with the exposure arrangement.
Innovation Solution
A stereolithography apparatus with a ball joint connection between the build platform and elevator mechanism, allowing limited movement and a locking mechanism to calibrate the orientation and zero level, ensuring the build platform is parallel to the exposure arrangement's surface, using a ball member and socket joint with a vertical guide for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the build platform is rigidly fixed to the elevator mechanism, then the structure is simple, but the orientation and zero level cannot be precisely calibrated
Solution Approach 1:
The build platform connection to the elevator mechanism is made dynamic through a ball joint, allowing the platform to be adjusted and calibrated in orientation and position, then locked in place. This dynamic connection enables precise calibration while maintaining structural integrity during operation.
Solution Approach 2:
The connection mechanism is segmented into distinct components: a ball joint for orientation adjustment, a locking mechanism for fixing the orientation, and a vertical guide for position calibration. This segmentation allows each component to perform its specific function independently, achieving precise calibration without excessive overall complexity.
2Measurement precision
If the build platform can move freely, then alignment adjustment is easy, but the zero level cannot be precisely determined
Solution Approach 1:
The ball joint provides dynamic movement capability allowing easy alignment adjustment, while the locking mechanism and vertical guide provide constraints that enable precise zero level determination. The system transitions between dynamic adjustment and constrained positioning as needed.
Solution Approach 2:
The vertical guide acts as an intermediary element between the ball joint and the build platform, allowing vertical movement while constraining horizontal movement. This intermediary enables precise zero level determination while maintaining ease of alignment adjustment through the ball joint.
3Measurement precision
If the build platform is positioned too low, then the zero level can be determined, but collision with the exposure arrangement occurs
Solution Approach 1:
The vertical guide serves as a protective intermediary between the build platform and the exposure arrangement, allowing the platform to be positioned at the correct zero level while preventing collision through its guiding and constraining action.
Solution Approach 2:
The locking mechanism is configured to lock the ball joint in a predetermined safe position that allows zero level determination without risking collision with the exposure arrangement. This preliminary positioning action prevents the harmful collision before it can occur.
4Object-affected harmful factors
If the build platform is positioned too high, then collision with the exposure arrangement is prevented, but the zero level cannot be determined
Solution Approach 1:
The ball joint and locking mechanism provide dynamic positioning capability, allowing the build platform to be moved to the correct zero level while the locking mechanism prevents upward movement that would cause collision with the exposure arrangement.
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
Enables precise calibration of the build platform's orientation and zero level, preventing collisions and ensuring accurate initiation of the printing process, enhancing the precision and efficiency of the 'bottom-up' 3D printing process.
Implementation Method 1
the build platform is connected to the frame via a ball joint, the ball joint allowing a limited range of movement of the build platform in all directions
Implementation Method 2
a locking mechanism is configured to lock the ball joint stationary for calibration of the orientation angle of the build platform
Implementation Method 3
A vertical guide is arranged in the frame, the socket member being arranged movable vertically inside and along the guide
Implementation Method 4
the locking mechanism is configured to lock the socket member stationary for calibration of the vertical position of the build platform
Implementation Method 5
Stereolithography is a 3D printing or additive manufacturing technique in which optical radiation is used to photopolymerize suitable raw material
Data Source
AI summary
A stereolithography apparatus comprises a build platform (8) connected to a movable frame (11) via a ball joint (12). The ball joint (12) permits a limited range of movement of the build platform in all directions. A locking mechanism (13) is configured to lock the ball joint (12) stationary for calibration of the orientation angle of the build platform (8) in relation to the exposure arrangement (6), so that the lower surface (9) of the build platform is parallel with the second upper surface (7) of the exposure arrangement (6). The ball joint (12) comprises a ball member (14) attached to the build platform (8) and a socket member (16; 16-1, 16-2) connected to the frame (11). A vertical guide (18) is arranged in the frame (11). The socket member (16) is arranged movable vertically inside and along the guide (18) to permit a limited vertical movement of the socket member (16) in relation to the frame (11). The locking mechanism (13) is configured to lock also the socket member (16; 16-1, 16-2) stationary for calibration of the vertical position of the build platform to determine a zero level of the build platform (8) in relation to the second upper surface (7) of the exposure arrangement (6).