Fused Deposition Modeling Heating System for Layer Bond Strength
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Solution Overview
Problem
In additive manufacturing, achieving strong bonds between layers is challenging due to temperature differences between new and old layers, particularly when the old layer is too cold, leading to structural weaknesses, especially in larger parts and faster manufacturing cycles.
Innovation Solution
A smart heating system with individually controllable heating elements arranged around the extruder nozzle tip, which selectively applies radiant heat to the old layer to maintain it above a minimum temperature threshold, ensuring a strong bond with the new layer, regardless of layer size or deposition speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If faster manufacturing cycles and larger part sizes are implemented, then productivity is improved, but the old layer temperature drops below the minimum threshold causing weak bonds
Solution Approach 1:
The system performs preliminary heating of the old layer surface before new material deposition occurs. By anticipating the deposition event and pre-heating the target area, the system ensures the substrate is at the optimal temperature range (above minimum threshold) for strong bonding, preventing the temperature drop issue that occurs with faster cycles
Solution Approach 2:
Instead of uniformly heating the entire old layer, the system applies heat locally only to the specific area where new material will be deposited. This localized heating approach allows faster cycle times while maintaining bond strength at the critical deposition interface, resolving the contradiction between productivity and bond strength
2Strength
If the old layer is kept warm to ensure good bonding, then layer bond strength is improved, but the manufacturing cycle time increases
Solution Approach 1:
The system applies heating only to the local area where new material will be deposited rather than maintaining warmth across the entire old layer. This selective local heating achieves strong bonds at the deposition interface without the time penalty of heating large areas, thus improving bond strength without proportionally increasing cycle time
3Area of stationary object
If larger part sizes are manufactured, then work envelope utilization is improved, but the old layer temperature drops due to increased travel time
Solution Approach 1:
The system pre-heats the old layer surface at the target location before the extruder arrives to deposit new material. This preliminary action compensates for the temperature drop that would normally occur during longer travel times associated with larger parts, ensuring the substrate is ready at the correct temperature regardless of part size
Solution Approach 2:
The heating system targets only the specific local area where deposition will occur rather than heating the entire part or work area. This allows large parts to be manufactured while maintaining temperature control at critical deposition zones, preventing temperature drops despite increased travel distances
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 solution ensures stable and strong part formation by maintaining the old layer surface temperature above the minimum threshold, preventing weak joints and enabling efficient production of large parts with improved structural integrity.
Implementation Method 1
a heater unit surrounding the nozzle and configured and arranged to direct radiant heat energy towards a deposition material situated on a mold base
Data Source
AI summary
Process and apparatus, applicable to new or existing machinery for additive manufacturing, based on Fused Deposition of thermoplastic material deposited in subsequent layers one on top of another, wherein the process can be carried out preventing abnormal conditions in which the old layer about to receive a new layer has a surface temperature below a desired limit, that is below which bond strength is compromised and the resulting part defective. This feature is particularly useful in large envelope parts where the previous layer zone, which is about to receive a new layer thereon, has reached a surface temperature below said threshold limit. The apparatus comprises a heating system featuring multiple stationary heating elements, each one of them selectively powered in order to adjust delivered energy in direction and in intensity according to layer path and extruder speed.