Additive Manufacturing Process Control for Filter Breakthroughs
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Solution Overview
Problem
Existing additive manufacturing processes face issues with contamination of process gas due to filter breakthroughs, leading to reduced component quality and potential machine damage, which are often undetected for a long time.
Innovation Solution
A method and system for controlling the manufacturing process using a contamination measuring unit to detect the degree of contamination in the process gas, allowing for automatic detection of filter breakthroughs and enabling control of the manufacturing process to prevent defects by interrupting or warning when contamination exceeds predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process gas is filtered using a two-stage filter system, then the degree of contamination is reduced to a minimum, but filter breakthroughs can remain undetected for a long time leading to quality reduction
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the contamination level of the process gas using a contamination measuring unit positioned downstream of the filter system. The control unit receives contamination level signals and compares them against threshold values, automatically triggering alarms or process interruptions when filter breakthroughs are detected, thus providing real-time feedback on filter performance
Solution Approach 2:
The patent introduces an intermediary contamination measuring unit that acts as a mediator between the filter system and the process chamber. This measuring unit detects particles that have passed through the filter without directly interfering with the filtering process itself, enabling indirect monitoring of filter effectiveness through continuous contamination level measurement
2Object-affected harmful factors
If process gas is continuously filtered and recirculated, then contamination is reduced, but machine damage can occur from undetected filter breakthroughs
Solution Approach 1:
The control unit continuously receives contamination level signals from the measuring unit and compares them against predetermined threshold values. When the contamination level exceeds the threshold, the system automatically triggers an alarm signal or process interruption, providing real-time feedback that prevents machine damage from undetected filter breakthroughs
Solution Approach 2:
The system performs preliminary detection of filter breakthroughs by continuously monitoring contamination levels before they can cause significant machine damage. The alarm and interruption mechanisms are activated in advance when contamination thresholds are exceeded, allowing preventive action before actual damage occurs
3Manufacturing precision
If a two-stage filter system is used, then particle contamination is minimized, but the system complexity increases
Solution Approach 1:
The contamination measuring unit serves as an intermediary monitoring device that adds minimal complexity to the existing two-stage filter system. Rather than modifying the filter structure itself, the measuring unit simply monitors the output, providing a non-intrusive way to detect filter breakthroughs while maintaining the simplicity of the original filtering approach
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
Prevents defects in components by reliably detecting minimal filter breakthroughs that could otherwise go undetected, maintaining component quality and preventing machine damage.
Implementation Method 1
detected with the help of a contamination measuring unit with the aid of which a number of measuring values allowing a conclusion to be drawn as to a degree of contamination in the process gas
Implementation Method 2
detected with the help of a contamination measuring unit with the aid of which a number of measuring values allowing a conclusion to be drawn as to a degree of contamination in the process gas
Implementation Method 3
the process gas is filtered to clean it
Implementation Method 4
selective solidification of the building material, wherein this solidification can take place in many manufacturing processes with the help of irradiation with radiation energy, e.g. electromagnetic radiation, in particular light and/or heat radiation
Implementation Method 5
the powder grains of the building material are partially or completely melted with the help of the energy introduced locally by the radiation at this point
Data Source
AI summary
Disclosed is a method for controlling a manufacturing process for additive manufacturing. In the method, a process gas loaded with contamination is discharged from a process space through a gas pipe, filtered and returned to the process space. The method further includes detecting a number of measuring values by a contamination measuring unit, each measuring value allowing an inference of a degree of contamination of the process gas flowing through the gas pipe prevailing at the time of detection, evaluating the number of measuring values, and controlling the device and/or an output device data-technically connected to the manufacturing process in dependence on the evaluation of the number of measuring values. Further disclosed is a corresponding system and a manufacturing device.