Ceramic Rolling Element Lattice Core for Faster Sintering
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Solution Overview
Problem
Current ceramic rolling elements face high production costs and lengthy processing times due to the use of bonding materials, which are expensive and require extensive heat treatment, limiting their application to niche fields where heat or speed are critical factors.
Innovation Solution
A ceramic rolling element with a continuous outer shell and lattice structured core, where the core is bonded to the inner surface of the shell, allowing for reduced material usage and faster sintering times through additive manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid ceramic rolling elements are manufactured using traditional die pressing and sintering processes, then the rolling elements achieve high density and strength, but the production cost increases and processing time extends significantly
Solution Approach 1:
The rolling element is divided into two distinct parts: a continuous outer shell and a lattice structured core. This segmentation allows the core to be sintered faster while the shell maintains the required strength and density, resolving the contradiction between strength and production efficiency
Solution Approach 2:
Different regions of the rolling element are given different properties: the outer shell is made with high density and fine grain structure for strength and surface quality, while the inner core uses a lattice structure with lower material density for faster sintering and reduced cost, achieving both strength and productivity goals
2Ease of manufacture
If bonding materials are used in traditional ceramic rolling element manufacturing, then the ceramic particles can hold their shape during processing, but the material cost increases and extensive heat treatment is required to remove the bonding materials
Solution Approach 1:
The bonding material is completely removed from the final product through extraction during sintering. The lattice core structure allows for complete burnout of organic binders without compromising the structural integrity of the rolling element, reducing material cost while maintaining ease of manufacture
Solution Approach 2:
The lattice core provides a porous structure that facilitates complete removal of bonding materials during sintering. The open framework allows gases and volatiles to escape easily, enabling binder removal without requiring excessive heat treatment time or complex processing
3Force
If larger rolling elements are produced using traditional processes, then the required load capacity is achieved, but the processing time increases and distortion from shrinkage becomes more significant
Solution Approach 1:
By segmenting the rolling element into shell and core, the sintering process can be optimized for each part. The lattice core sinters faster and with less shrinkage distortion, while the outer shell provides the necessary load-bearing capacity, reducing overall processing time for large rolling elements
Solution Approach 2:
The lattice core structure is pre-formed with an open framework that anticipates and accommodates shrinkage during sintering. This preliminary structural design allows for controlled densification without excessive distortion, maintaining dimensional accuracy while reducing processing time
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
Reduces material costs and processing time, enabling broader application in various fields by utilizing less material and minimizing distortion, thus enhancing system efficiency and reducing production time.
Implementation Method 1
The lattice structured core may be bonded to an inner surface of the outer shell, for example, by being integrally formed with the outer shell
Data Source
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AI summary
A bearing rolling element with a lattice internal structure provides several advantages over a solid bearing. It is lighter than a solid bearing, reducing centrifugal forces. For ceramic bearings, less material is required, and sintering times are reduced because bonding material can flow easily to near the surface. Elements with an internal lattice also offer advantages over hollow rolling elements. The shell can be thinner without sacrificing load capacity. The thinner shell reduces the time required for bonding material to be removed during sintering. The blank can be formed using various additive manufacturing processes.