Ceramic Ball CIP Reorientation for Uniform Density
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Solution Overview
Problem
Existing methods for manufacturing ceramic ball materials result in density unevenness due to fixed positioning during CIP forming, leading to polishing inefficiencies and density variations in the sintered compacts.
Innovation Solution
Perform multiple CIP processes on ceramic green compacts, changing the orientation of the compacts between each process to uniformly apply pressure and reduce density unevenness, followed by sintering and optional HIP processing to achieve high relative densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CIP forming is performed multiple times with fixed positioning, then the green compact density increases, but density unevenness persists and polishing efficiency decreases
Solution Approach 1:
The patent applies the dynamics principle by changing the positioning orientation of the green compact between CIP forming cycles. Instead of maintaining a fixed position, the compact is reoriented (e.g., rotated 90 degrees or flipped) before subsequent CIP forming operations. This dynamic adjustment ensures that density unevenness developed in one orientation is compensated in the next orientation, achieving uniform density distribution throughout the compact while maintaining high polishing efficiency.
2Manufacturing precision
If CIP forming is repeated many times to resolve density unevenness, then density uniformity improves, but manufacturing time increases
Solution Approach 1:
The patent implements periodic action by performing CIP forming in cycles with periodic reorientation of the green compact. Instead of continuous forming in one position, the process alternates between forming operations and reorientation steps. This periodic intervention efficiently eliminates density unevenness in fewer cycles compared to continuous forming, thereby reducing total manufacturing time while achieving uniform density.
3Ease of manufacture
If the green compact position remains fixed during CIP process, then the forming process is simple, but density unevenness is generated
Solution Approach 1:
The patent resolves this contradiction by introducing dynamic repositioning into the otherwise simple CIP forming process. The green compact is periodically reoriented between forming cycles, adding a simple rotational or flipping operation that maintains process ease while eliminating density unevenness. This dynamic adjustment requires minimal additional complexity but dramatically improves density uniformity.
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 method significantly reduces density variations in the ceramic ball materials, improving polishing efficiency and reducing the time required for finishing, making them suitable for high-quality bearing balls.
Implementation Method 1
CIP (cold isostatic pressing) forming is performed on a ceramic green compact that has been molded by using a mold in a molding step
Implementation Method 2
a step of sintering a CIP green compact produced by a final CIP process among the plurality of times of the CIP process to produce a ceramic sintered compact
Implementation Method 3
performing a HIP (hot isostatic pressing) process on the ceramic sintered compact
Data Source
Figure 1~3
Figure 4(A)~5
AI summary
A method for manufacturing a ceramic ball material according to an embodiment, includes: a step of producing a ceramic green compact; a step of performing a plurality of times of a CIP process on the ceramic green compact to produce a CIP (cold isostatic pressing) green compact; and a step of sintering a CIP green compact produced by a final CIP process among the plurality of times of the CIP process to produce a ceramic sintered compact. In the step of producing the CIP green compact, after a former CIP process among the plurality of times of the CIP process is performed, an orientation of a CIP green compact produced by the former CIP process is changed, and a latter CIP process is performed.