3D Printer Print Head Local Interface Heating
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Solution Overview
Problem
Additive manufacturing processes, such as FLM, result in mechanical anisotropies and suboptimal interlaminar adhesion due to temperature gradients, leading to component distortion and reduced mechanical properties, with existing solutions like heating the entire installation space causing additional issues like motor failures and limited adhesion improvement.
Innovation Solution
A print head with a heated nozzle and a separate melting device that locally heats areas of the previously applied material during movement, using a laser to heat the interface between layers, allowing for improved mechanical properties by enhancing the connection between layers similar to transmission welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the entire build chamber is heated to improve adhesion and reduce warpage, then interlaminar adhesion improves, but mechanical parts such as motors and electronic components are exposed to direct heat causing failures
Solution Approach 1:
The patent applies selective heating by directing a heat source (such as a hot air jet or heating element) only to the interface region between the current layer and previously deposited layer. This localized heating approach raises the temperature specifically at the bonding interface to improve adhesion, while keeping the rest of the build chamber and mechanical components at lower temperatures, thus avoiding heat-induced failures in motors and electronics.
Solution Approach 2:
The heating function is segmented into two distinct zones: a heated interface zone for adhesion improvement and a cool zone for protecting mechanical components. The build chamber is effectively divided into these functional zones through controlled heat application, allowing simultaneous achievement of good bonding and component reliability.
2Stability of the object's composition
If the entire build chamber is heated to improve adhesion, then warpage is reduced, but the insulation concept becomes very complex to protect attached parts from heat convection
Solution Approach 1:
Instead of heating the entire build chamber and requiring complex insulation, the patent applies heating locally only to the deposition interface. This selective heating reduces warpage by ensuring proper bonding at each layer interface without subjecting the entire structure to high temperatures, thereby eliminating the need for complex insulation systems.
3Strength
If heating is applied during the entire build process, then adhesion and warpage are improved, but degradation reactions in the polymer chains occur
Solution Approach 1:
The patent applies heating briefly and selectively only when needed at the interface during layer deposition, rather than maintaining continuous heating throughout the build process. This preliminary and localized heating action achieves adequate adhesion without prolonged thermal exposure that would cause polymer degradation reactions.
Solution Approach 2:
Heating is applied locally only to the interface region where adhesion is needed, avoiding unnecessary thermal exposure of the bulk polymer material. This localized approach improves adhesion while minimizing degradation reactions in the polymer chains by limiting the duration and spatial extent of thermal exposure.
4Productivity
If conventional heating is used to melt material and apply it to previously deposited material, then material is dispensed, but the previously deposited material has already cooled resulting in insufficient welding and reduced mechanical properties
Solution Approach 1:
The patent reorders the heating action to occur before or during material deposition rather than after. The previously deposited layer is heated to the appropriate temperature in advance, and then fresh material is applied while the interface is still hot, ensuring proper welding and bonding. This preliminary heating action maintains material temperature for effective bonding without sacrificing deposition speed.
Solution Approach 2:
The patent implements periodic heating cycles at the interface during the layer-by-layer deposition process. Each cycle involves briefly heating the interface region just before or during material application, ensuring consistent bonding quality across all layers while maintaining overall productivity.
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 solution significantly reduces mechanical anisotropy and improves the mechanical properties of the component, enabling better prediction and dimensioning, while avoiding overheating issues and enhancing interlaminar adhesion.
Implementation Method 1
a heated nozzle for melting the material and dispensing the molten material
Implementation Method 2
a melting device configured to continuously and locally heat specific areas of the previously applied material during the movement of the printhead
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a print head (2) for a printing device (1) for the three-dimensional application of a material, comprising a heated nozzle (3) for melting the material and for dispensing the melted material (4), the print head (2) being designed to apply, as said print head (2) moves along a predefined direction of travel (V), the melted material (4) in the form of a strand on a previously applied material (5), which has at least partly solidified, and/or on a substrate (6), the print head (2) having a melting device (10) and said melting device (10) being designed to continuously apply heat locally to respective regions (12, 14) of the previously applied material (5), as the print head (2) is moving.