Green Compact Press Tool for Multi-Part Interference Fitting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing green compacts often result in sintered components that are prone to cracking due to density inhomogeneities and axial/radial stresses, and require separate compaction and assembly of parts, which is time-consuming and may lead to fitting inaccuracies.
Innovation Solution
A method where at least two partial green compacts are pressed and joined in a single operation using a press tool with separate working spaces, allowing for independent compaction and interference fitting without disruptive stresses, and optionally post-compacting the joined body in the same tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate compaction and assembly of parts is performed, then manufacturing flexibility is improved, but production time increases and fitting accuracy deteriorates
Solution Approach 1:
The patent combines separate compaction and assembly operations into a single integrated process. Multiple partial green compacts are compacted and assembled simultaneously in one press operation, eliminating the need for separate compaction and assembly steps. This merging of operations reduces production time while maintaining manufacturing flexibility through the modular tooling design.
Solution Approach 2:
The press tool is divided into separate working spaces that can independently compact different subsets of powdered material. This segmentation allows each working space to form partial green compacts simultaneously, which are then assembled within the same tool. The segmented approach enables parallel processing of multiple components, improving productivity without sacrificing manufacturing flexibility.
2Ease of operation
If separate compaction and assembly of parts is performed, then ease of assembly is improved, but manufacturing precision deteriorates due to fitting inaccuracies
Solution Approach 1:
By combining compaction and assembly in a single operation within the same press tool, the invention eliminates dimensional tolerances that would arise from separate operations. The partial green compacts are assembled while still in the green state, allowing for precise interference fitting without the accumulation of tolerances that would occur with separate compaction and assembly steps.
Solution Approach 2:
The partial green compacts are prepared in advance within the same tool that will perform the final assembly. This preliminary action within the integrated tooling system ensures that all components are positioned and fitted with high precision before the final compaction, eliminating fitting inaccuracies that would result from separate operations.
3Device complexity
If conventional compaction methods are used, then process simplicity is improved, but reliability deteriorates due to cracking from density inhomogeneities and stresses
Solution Approach 1:
The invention segments the powdered material into multiple subsets that are compacted independently in separate working spaces. This segmentation allows each subset to be compacted to uniform density without the density inhomogeneities that occur in conventional single-piece compaction. The resulting partial green compacts have more homogeneous density distributions, reducing internal stresses and cracking risk.
Solution Approach 2:
By merging the compaction of multiple subsets with their assembly into a single integrated operation, the invention eliminates the disruptive stresses that would arise from separate handling and assembly operations. The partial green compacts are assembled while in the green state, allowing for stress-free interference fitting that maintains structural integrity and prevents cracking.
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 the risk of cracking, achieves a high degree of fitting accuracy, and allows for faster production with a firm mechanical clamping force sufficient for transport to a sintering furnace, resulting in a green compact with strength comparable to the final sintered structure.
Implementation Method 1
the first and second subsets are compressed at least in the first working chamber to form a first partial green part and in the second working chamber to form a second partial green part
Implementation Method 2
the at least two partial green parts are pressed and joined in a single operation... allowing for independent compaction and interference fitting without disruptive stresses
Data Source
Figure 1A~2F
Figure 3A~4
AI summary
The invention relates to a method for producing a green compact, said green compact comprising at least two partial green compacts, each partial green compact being compacted and joined from at least one powdery material in one working cycle. Particularly, two, three, four or more than four partial green compacts can be compacted and joined in one working cycle.