Integrated Frame Casting Structure for Weld Fatigue Reduction
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Solution Overview
Problem
Traditional frame designs for heavy machinery are prone to stress concentration and fatigue failures at weld joints, leading to increased manufacturing complexity and cost, while existing solutions often involve trade-offs in weight, manufacturability, and cost.
Innovation Solution
A frame casting assembly with a central box section for managing bending loads, circular cross-sections for torsional loads, and a bridge casting section connecting legs to reduce stress concentration and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional welded assemblies are used for frame construction, then manufacturing flexibility is provided, but stress concentration and fatigue failures occur at weld joints
Solution Approach 1:
The patent merges multiple separate frame components into a single integrated casting assembly. The frame assembly includes a first component, second component, and third component that are formed as one unified casting, eliminating the need for weld joints between these components. This resolves the contradiction by maintaining manufacturing flexibility through integrated design while eliminating stress concentration at weld joints, thereby improving reliability and fatigue resistance.
2Strength
If multiple large welded components are used, then structural requirements are met, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple large frame components into a single integrated casting assembly, reducing the number of separate parts that need to be manufactured, handled, and assembled. This integration maintains the required structural integrity while significantly reducing manufacturing complexity and associated costs.
Solution Approach 2:
While integrating components, the design incorporates strategic cutouts and openings that segment the solid structure to reduce material usage and weight. These cutouts allow the integrated casting to maintain structural strength while simplifying manufacturing processes and reducing overall complexity.
3Strength
If reinforced sections are incorporated to manage bending loads, then bending strength is improved, but weight increases
Solution Approach 1:
The patent applies local quality by incorporating specific structural features at critical locations within the integrated casting. The design includes varying wall thicknesses, strategic rib placements, and localized reinforcement only where bending loads are most severe, rather than uniformly reinforcing the entire structure. This approach improves bending strength where needed while minimizing overall weight increase.
4Reliability
If specialized materials are used to enhance fatigue resistance, then durability is improved, but cost increases
Solution Approach 1:
By integrating multiple components into a single casting, the patent eliminates weld joints which are the primary source of stress concentration and fatigue failure. This design approach achieves superior fatigue resistance through the inherent continuity of the integrated structure, avoiding the need for specialized or expensive materials that would otherwise be required to compensate for weak weld joints.
Data Source
AI summary
A frame casting assembly for a frame of a work machine is disclosed. The frame casting assembly comprises a first end, a middle section, and second end, the first end extending from the middle section and the second end extending from the middle section; the middle section includes: a shaft cutout; a box casting section for managing bending; a first leg and a second leg extending from the middle section; a bridge casting section connecting the first leg and the second leg; and the box casting section and the bridge casting section enclose the shaft cutout.