Toroid Parts with Sinter-Bonded Inner and Outer Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for powder metal parts that are stronger, more durable, and capable of meeting stringent performance requirements, particularly for toroidal shapes like gears and bearing races, while maintaining low manufacturing costs and flexibility to accommodate specific customer needs.
Innovation Solution
A method involving an external component made of double press double sinter or forged powder metal/wrought metal and an internal powder metal component, where the internal component is compacted and sintered within the external component to form a metallurgical bond, allowing for the creation of high-strength, lightweight toroidal parts with reduced density and lower capital and operating costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional powder metal compaction and sintering is used, then manufacturing cost is reduced, but part strength and durability are insufficient
Solution Approach 1:
The toroidal part is divided into an outer component and an inner component that are separately manufactured and then metallurgically bonded together. The outer component provides structural strength while the inner component provides functional properties, allowing each part to be optimized independently for strength and durability.
Solution Approach 2:
The invention creates a composite structure by metallurgically bonding two different powder metal components together. This composite construction allows the part to achieve superior strength and durability properties that cannot be obtained with a single material, while still maintaining the cost advantages of powder metal manufacturing.
2Strength
If larger forging presses are used to manufacture toroidal parts, then part strength is improved, but capital expenditure and operating costs increase
Solution Approach 1:
By segmenting the part into two components that are separately compacted at lower pressures and then bonded, the invention eliminates the need for high-pressure forging presses. This segmentation allows the use of smaller, more energy-efficient equipment while achieving the same or better strength through the metallurgical bond between components.
Solution Approach 2:
The invention changes the compaction pressure parameter by performing two separate compacting operations at moderate pressures rather than one high-pressure operation. This parameter change allows the use of smaller presses with lower energy consumption while achieving equivalent or superior part strength through the subsequent metallurgical bonding process.
3Duration of action of stationary object
If conventional single-component powder metal parts are manufactured, then manufacturing simplicity is maintained, but part durability and service life are limited
Solution Approach 1:
The part is segmented into an outer component and an inner component with different material properties and functions. This segmentation allows each component to be optimized for its specific function, resulting in a composite part with enhanced durability and extended service life, while the modular approach actually simplifies certain aspects of manufacturing and quality control.
Solution Approach 2:
By creating a composite structure with two different powder metal components metallurgically bonded together, the invention achieves superior durability and service life. The composite construction allows selection of materials optimized for wear resistance, strength, and other durability-critical properties, extending the operational life of the part.
4Strength
If toroidal parts are made with higher density, then strength is improved, but part weight increases
Solution Approach 1:
The invention applies local quality by creating regions of different density within the toroidal part. The outer component can have higher density for structural strength, while the inner component can have lower density for weight reduction. This localized differentiation of material properties allows the part to achieve the necessary strength while minimizing overall weight.
Solution Approach 2:
The composite structure allows combination of materials with different density characteristics. By selecting appropriate powder metal compositions for the outer and inner components, the invention achieves an optimal balance between strength and weight, creating a part that is strong where needed but lightweight overall.
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 produces toroidal parts with superior strength, durability, and reduced weight, enabling the production of parts like gears and clutches with enhanced performance without compromising tolerances or uniformity, and can be manufactured using smaller, more energy-efficient forging presses.
Implementation Method 1
The green internal component is sintered within the confines of the external component under conditions which allow for mechanical and metallurgical bonding between the internal component and the external component of the part
Implementation Method 2
The temperature at which the article is sintered is under the melting point of the metal yet high enough to result in the metal particles of the part bonding together by diffusion rather than by melting and re-solidification
Data Source
AI summary
It has been found that duplex monolithic parts can be manufactured in high volume at low cost by using powder metal technology to mold and sinter an inner component of the part into an outer component of the part. This technique reduces the cost of manufacturing intricate metal products by taking advantage of the attributes of powder metal technology in making the inner component of the part. The outer component of the part can be wrought machined, stamped or forged, or made by double press double sinter or forging a powder metal component of the part. In any case, this technique can beneficially be used in making a wide variety of toroid parts, such as gears, clutches, sprags, bearing races, one-way diodes, and the like.