Metal Additive Manufacturing With Movable Cooling for Long Parts
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Solution Overview
Problem
In additive manufacturing of metal parts, particularly long substrates, there are challenges with heat dissipation leading to overheating, oxidation of reactive metals, and deformation due to temperature gradients, which increase manufacturing time, cost, and result in economic losses.
Innovation Solution
A method involving a movable cooler that dissipates heat around deposited layers to control temperature, combined with a reduced inert gas enclosure and controlled inert gas diffusion to prevent oxidation, allowing for precise temperature management and efficient deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If welding energy is reduced to prevent overheating, then temperature control is improved, but deposition rate decreases and manufacturing time increases
Solution Approach 1:
The cooling system is divided into multiple independent cooling zones that can be controlled separately. Each zone can apply cooling intensity tailored to local thermal conditions, allowing efficient heat removal without requiring overall reduction of welding energy, thus maintaining deposition rate while improving temperature control.
Solution Approach 2:
The cooling system dynamically adjusts cooling intensity in real-time based on thermal feedback from different zones. This dynamic control allows the system to apply maximum cooling where and when needed, preventing overheating without reducing welding power globally, thereby maintaining high deposition rates.
2Temperature
If a fixed cooled bed is used to dissipate heat, then temperature control is improved, but adaptability to different geometries is limited
Solution Approach 1:
The cooling system transitions from a fixed configuration to a movable multi-zone system that can be repositioned and reconfigured for different part geometries. Each cooling zone can be independently positioned and controlled, providing both effective heat dissipation and adaptability to various component shapes and sizes.
Solution Approach 2:
Different cooling zones can be configured with different cooling intensities and characteristics tailored to local geometric requirements. This allows the system to provide optimal heat dissipation for complex geometries with varying thermal demands in different regions, rather than applying uniform cooling.
3Object-affected harmful factors
If large inert gas enclosures are used to prevent oxidation, then protection against oxidation is improved, but manufacturing cost and system complexity increase
Solution Approach 1:
Inert gas protection is applied locally only in the immediate vicinity of the molten pool and fresh deposits where oxidation risk exists. This localized protection approach eliminates the need for large full-enclosure systems, reducing complexity and cost while maintaining effective oxidation prevention where it is most needed.
Solution Approach 2:
The inert gas protection is extracted from a global enclosure system and applied specifically to the critical zone around the deposition area. This selective application removes unnecessary enclosure structures and simplifies the system while maintaining oxidation protection effectiveness.
4Temperature
If waiting time between layers is increased to prevent overheating, then temperature control is improved, but manufacturing time increases significantly
Solution Approach 1:
The cooling system enables continuous deposition without interruption or waiting periods. By actively removing heat during the deposition process itself, the system maintains temperature control while keeping the deposition operation continuous, eliminating the time losses associated with waiting between layers.
Solution Approach 2:
Cooling action is applied in advance and concurrently with deposition rather than after overheating occurs. This preliminary and simultaneous cooling prevents temperature buildup before it becomes problematic, allowing continuous operation without the need for interruptive waiting periods.
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
This method reduces manufacturing time and costs, prevents overheating and oxidation, and minimizes deformations, enabling the production of complex, long metal parts with improved thermal control and reduced economic impact.
Implementation Method 1
cooling, using a cooler that is movable relative to the substrate, a cooling zone located at least around the last layer deposited
Implementation Method 2
dissipate heat around deposited layers
Implementation Method 3
oxidation of the molten metal... carry out the metal additive manufacturing in an environment free from oxygen... controlled inert gas diffusion to prevent oxidation
Implementation Method 4
creation of deformations linked to a significant temperature gradient between the layer n−1 previously deposited and the layer n being deposited... local relaxation of stresses at high temperatures
Data Source
AI summary
A method for the additive manufacturing of a metal part on a substrate, by adding at least one molten metal layer by layer. The method includes the following steps: a) step a: depositing the molten metal layer by layer, b) step b: simultaneously with step a), cooling, by means of a cooler that is mobile relative to the substrate, a cooling zone located at least around the layer deposited immediately prior to the layer currently being deposited.