Hollow Ball Stud Assembly for Lower Machining and Material Loss
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Solution Overview
Problem
The existing manufacturing process for ball studs in ball joints involves high material loss, excessive machining work, and increased costs due to the need for uniform surface treatment of both the ball and stud, which are typically made as one piece from rod material.
Innovation Solution
The ball stud is manufactured from two separate components: a hollow ball providing the spherical bearing surface and a carrier part for force transmission and connection, allowing for reduced machining and material usage, with the hollow ball receiving specialized surface treatment for hardness and wear resistance while the carrier part uses less expensive materials and coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ball stud is manufactured as one piece from rod material, then structural integrity is ensured, but material loss increases and machining expenditure rises
Solution Approach 1:
The ball stud is divided into two separate components: a hollow ball and a carrier part. The hollow ball is produced from a blank with minimal material removal, while the carrier part is attached separately. This segmentation eliminates the need to machine the entire length of a solid rod, dramatically reducing material loss while maintaining structural integrity through the connection of the two parts.
2Device complexity
If ball stud is manufactured as one piece, then manufacturing process is simple, but machining expenditure and time increase
Solution Approach 1:
By segmenting the ball stud into hollow ball and carrier part, each component can be manufactured independently using optimized processes. The hollow ball requires minimal machining from its blank, and the carrier part can be produced separately and attached, reducing overall machining expenditure and time despite adding an assembly step.
Solution Approach 2:
The invention changes the geometric parameters of the blank used for the hollow ball, using a shape that closely approximates the final ball geometry. This parameter optimization minimizes the material that needs to be removed during machining, significantly reducing machining costs and time.
3Reliability
If uniform surface treatment is applied to both ball and stud, then wear resistance is ensured, but treatment costs and time increase
Solution Approach 1:
The hollow ball and carrier part can receive different surface treatments optimized for their specific functions. The hollow ball, which requires high wear resistance for the bearing surface, can undergo expensive treatments like gas nitriding. The carrier part, which has less stringent requirements, can receive simpler and cheaper coatings, thereby reducing overall treatment costs while maintaining necessary wear resistance.
4Strength
If high-strength material is used for entire ball stud, then strength is ensured, but weight and material cost increase
Solution Approach 1:
The hollow ball, which requires high strength and wear resistance for bearing operations, is made from high-strength material. The carrier part, which has different functional requirements, can be made from a lighter or less expensive material. This local differentiation of material properties reduces overall weight and material cost while ensuring strength where it is most needed.
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 approach significantly reduces manufacturing expenditure and time, enabling more efficient production with optimized material usage and surface treatment, resulting in a lighter and cost-effective ball stud.
Implementation Method 1
the hollow ball is arranged on the carrier part with a press fit
Data Source
AI summary
A ball joint includes a carrier part and a hollow ball which is a component separate from the carrier part and is fixed on the carrier part.