Duplex Toroid Parts With Sinter-Bonded Inner and Outer Components
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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 a double press double sinter or forged powder metal external component and a sintered powder metal internal component, where the internal component is compacted and sintered within the external component to achieve mechanical and metallurgical bonding, allowing for the use of different materials to enhance performance and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional powder metal technology is used to manufacture toroidal parts, then manufacturing cost is reduced, but part strength and durability are insufficient
Solution Approach 1:
The toroidal part is divided into two distinct components: an external component made by conventional powder metal technology and an internal component made by injection molding. This segmentation allows each component to be optimized for its specific manufacturing process, enabling the internal component to provide enhanced strength while the external component maintains cost-effectiveness.
Solution Approach 2:
The invention creates a composite structure by combining two different manufacturing technologies - powder metal external component and injection molded internal component. This composite approach leverages the advantages of both methods: the cost-effectiveness of powder metal and the superior strength and complexity capability of injection molding.
2Ease of manufacture
If traditional machining procedures are used to manufacture toroidal parts, then part strength can be achieved, but labor costs and manufacturing complexity increase substantially
Solution Approach 1:
The invention merges powder metal technology with injection molding technology in a single integrated process. The injection molded internal component is formed directly within the powder metal external component, eliminating the need for separate machining operations and reducing manufacturing complexity while maintaining part strength.
Solution Approach 2:
The internal component is pre-formed through injection molding before final assembly, allowing complex geometries to be created in advance with high precision. This preliminary action eliminates the need for subsequent machining operations, reducing both labor costs and manufacturing time.
3Strength
If larger forging presses are used to manufacture toroidal parts, then part strength can be increased, but capital expenditures and energy consumption increase
Solution Approach 1:
Instead of uniformly increasing the size of the entire part to achieve strength, the invention applies local reinforcement by injecting a high-strength internal component only in the specific regions where additional strength is needed. This localized approach achieves the required strength without increasing the overall size or energy consumption of the manufacturing process.
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 resulting parts exhibit superior strength, durability, and reduced weight, enabling the production of high-quality toroidal parts like gears and clutches with improved torsional and radial strength, while being lighter and more energy-efficient, thus meeting stringent performance requirements without compromising tolerances or uniformity.
Implementation Method 1
sintering the green internal component 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.