Plastic Blasting Medium for Additive Manufacturing Depowdering
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Solution Overview
Problem
Conventional blasting agents used in additive manufacturing, such as glass beads, often damage surfaces, contaminate components, and require separate systems for depowdering and compaction, leading to surface changes, contamination, and increased processing complexity due to their abrasive nature and varying grain sizes.
Innovation Solution
A plastic blasting agent comprising particles made from a polymer and non-abrasive foreign particles, such as glass or ceramics, which are designed to be gentle on surfaces, reduce contamination, and facilitate both depowdering and compaction processes without surface alteration, using a single system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blasting agents (glass beads, ceramic beads) are used for depowdering, then the unfused powder particles are removed from the component, but the component surface is damaged, altered, or contaminated
Solution Approach 1:
The patent changes the material parameter of the blasting agent from conventional glass or ceramic beads to plastic particles. This material substitution fundamentally alters the interaction mechanism with the component surface, reducing harmful effects while maintaining depowdering effectiveness. The plastic particles provide sufficient cleaning action without causing surface damage or contamination.
Solution Approach 2:
The patent employs plastic particles that can be easily replaced or regenerated. These particles are designed to be consumed or degraded during the blasting process, and can be replenished without requiring complex recovery systems. This approach simplifies the overall system while maintaining effective surface treatment.
2Productivity
If glass beads with high mass are used for depowdering, then the unfused powder is effectively removed, but already fused particles are removed and fine geometries are damaged
Solution Approach 1:
The patent changes the mass parameter of the blasting particles by using plastic material instead of dense glass beads. This reduction in particle mass decreases the kinetic energy and impact force, allowing effective removal of loose powder while preserving already fused particles and fine geometric features on the component surface.
3Reliability
If separate systems are used for depowdering and compaction, then each process can be optimized independently, but the processing complexity and time increase
Solution Approach 1:
The patent employs plastic particles that can perform multiple functions within a single blasting system. The same plastic particles used for depowdering can also achieve surface compaction and smoothing effects, eliminating the need for separate blasting systems and reducing overall process complexity while maintaining reliable surface treatment.
Solution Approach 2:
The patent merges the depowdering and compaction functions into a single blasting process using plastic particles. By combining these operations, the system reduces complexity, decreases processing time, and eliminates the need for multiple specialized systems while achieving both powder removal and surface consolidation.
4Productivity
If conventional blasting agents are used, then the blasting process is effective, but a large amount of dust is formed and disposal costs increase
Solution Approach 1:
The patent changes the material composition of the blasting agent from conventional abrasive materials to plastic particles. This material substitution reduces dust formation during the blasting process and eliminates the need for expensive disposal of contaminated blasting media, while maintaining effective surface treatment performance.
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 plastic blasting agent effectively depowders and compacts additive manufacturing components without surface damage, reduces contamination, and simplifies processing by using a single system, improving surface quality and homogeneity while maintaining the original surface integrity until desired compaction.
Implementation Method 1
blasting material is blasted into a process chamber of the blasting system by means of one or more blasting nozzles or one or more blast wheels
Implementation Method 2
remove the unfused powder particles from the component by hitting the component
Implementation Method 3
the initially open-pored surface of the additively manufactured component is compacted. The pores can be closed to a certain extent
Data Source
AI summary
The invention relates to a plastic blasting agent A and the use of a plastic blasting agent A, comprising at least one particle PA1 made from at least one polymer KA1 and at least one foreign particle FA1 for the surface treatment of a component that was created using additive manufacturing.