Hard-Material Threaded Connection with Differential Pitch
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Solution Overview
Problem
The failure of threaded connections between hard-material structural parts and components with higher elasticity due to differing material properties, leading to issues like stripped threads or cracks, is a persistent problem in cutting machining applications.
Innovation Solution
Implementing a hard-material threaded connection with a first threaded portion and a second threaded portion having a different thread pitch, specifically between 2.1% and 8% deviation, to achieve load distribution that prevents failure of the hard-material threaded portion, particularly by designing the first threaded portion as an internal thread with a higher pitch than the standard, and using a standard external thread with a countersink for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard threaded portions with identical thread pitch are used to connect hard-material structural parts and components with higher elasticity, then the threaded connection can be easily manufactured and assembled, but the threaded portion on the hard-material structural part fails due to stripped threads or cracks caused by different material properties
Solution Approach 1:
The patent changes the thread pitch parameter of the first threaded portion formed in the hard-material structural part to be different from the thread pitch of the second threaded portion on the component with higher elasticity. This parameter change prevents failure by distributing mechanical stresses differently during assembly and operation, avoiding the concentrated stress that causes stripped threads or cracks in hard materials when identical standard threads are used.
Solution Approach 2:
The patent applies different thread pitch characteristics to different parts of the threaded connection system. The first threaded portion in the hard-material structural part has a specific thread pitch optimized for that material, while the second threaded portion on the component with higher elasticity has a different thread pitch optimized for its material properties. This local differentiation allows each component to interact with the threaded connection in a way that respects its material characteristics.
2Strength
If the thread pitch of the first threaded portion is increased to distribute load more effectively, then the risk of thread stripping and cracking is reduced, but the compatibility with standard components and tools is decreased
Solution Approach 1:
The patent modifies the thread pitch parameter of the first threaded portion to optimize load distribution and prevent failure in hard-material structural parts. By carefully selecting a thread pitch that differs from standard specifications, the invention achieves better mechanical strength and reliability while managing the trade-off with compatibility through precise engineering of the non-standard dimension.
Data Source
AI summary
A hard-material threaded connection includes a structural part, which has a hard material and a first threaded portion formed in the hard material, and a component having higher elasticity that has a second threaded portion cooperating with the first threaded portion. The first threaded portion and the second threaded portion have a different thread pitch.