Adapter Board Bolted Joint Surface Curvature
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Solution Overview
Problem
The bolted joint interface between the adapter board and the moldboard in motor graders is prone to loosening due to improper machining or deflection, leading to the adapter board falling off, necessitating costly maintenance and frequent replacements of serrated cutting edges.
Innovation Solution
A blade assembly with a bolted joint interface featuring an adapter board with undulating peak and valley surfaces that match the curved profile of the moldboard, reducing the need for precise machining and providing enhanced bolt retention through ribbed channels and cross-ribs, allowing for cost-effective manufacturing without requiring a five-axis milling machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the adapter board attachment surface is made flat while the moldboard profile is curved, then the manufacturing complexity is reduced, but the bolted joint becomes loose and the adapter board falls off
Solution Approach 1:
The adapter board attachment surface is designed with a curved profile that matches the moldboard curvature. This curvature allows the surface to conform to the moldboard shape, distributing contact pressure along the curved interface and preventing bolt loosening while maintaining manufacturing feasibility through standard machining processes
Solution Approach 2:
The solution transitions from a simple flat surface to a three-dimensional curved surface that incorporates the moldboard's curvature. This dimensional change allows the attachment surface to adapt to the curved moldboard profile, ensuring proper contact and bolt retention without requiring complex five-axis machining
2Reliability
If five-axis milling machine is used to machine the adapter board with precise curvature, then the bolted joint stability is improved, but the manufacturing cost increases
Solution Approach 1:
The curved attachment surface is designed with a profile that matches the moldboard curvature, allowing standard two-axis or three-axis milling machines to achieve the required geometry. This curvature design ensures proper contact and bolt retention while avoiding the need for expensive five-axis machining equipment
Solution Approach 2:
The curvature radius and profile parameters of the adapter board attachment surface are optimized to match the moldboard geometry. By carefully selecting these parameters, the design achieves reliable bolted joint stability that can be manufactured with conventional machining equipment, reducing manufacturing costs while maintaining performance
Data Source
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AI summary
A blade assembly (100) comprises a moldboard (102) defining an upper moldboard free end (104) and a lower moldboard free end (106), the lower moldboard free end (106) defining a lower curved mounting surface (108), and an adapter board (200) defining an upper adapter board attachment portion (202), and a lower tool bit attachment portion (206). The upper adapter board attachment portion (202) may include a first peak surface (210) and a second peak surface (212), the first peak surface (210) and the second peak surface (212) forming a first valley (221) therebetween and being configured to contact the lower curved mounting surface (108).