Securing Nut Blank With Conical Collar for Accurate Thread Reshaping
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Solution Overview
Problem
Existing methods for producing screw-nut blanks often result in complex, cost-intensive processes with potential weak points due to complex component connections or require radial upsetting, leading to inaccurate inner surfaces and reduced securing effectiveness.
Innovation Solution
A screw-nut blank with a conical cross-sectional ring collar that widens axially, allowing reshaping into a shaped collar without radial upsetting, maintaining a thickness ratio of 0.45 to 0.75, enabling a recess-free surface and improved spring properties for enhanced securing threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ring collar is made with larger thickness to form a sufficiently long securing thread, then the thread formation is improved, but the reshaping process causes excessive stress and material corrugation
Solution Approach 1:
The patent applies parameter changes by specifying an optimal thickness ratio (0.45-0.75) of the ring collar that balances two competing requirements: providing sufficient material for secure thread formation while maintaining material integrity during the reshaping process. This quantitative parameter optimization resolves the contradiction between thread quality and material strength.
2Manufacturing precision
If radial upsetting is used to reshape the ring collar, then the inner end surface width is increased for better thread formation, but the inner surface accuracy deteriorates due to insufficient control
Solution Approach 1:
The patent applies preliminary action by pre-forming the ring collar with the optimal thickness ratio before the reshaping process. This preliminary configuration ensures that when axial reshaping occurs, the material distributes evenly without causing corrugation or surface inaccuracies, thus achieving both adequate inner end surface width and high surface accuracy.
3Adaptability or versatility
If a multi-part production approach is used for the securing nut, then component flexibility is improved, but the production complexity and cost increase
Solution Approach 1:
The patent applies merging by integrating the ring collar and nut body into a single monolithic component formed through cold extrusion and reshaping processes. This eliminates the need for separate components and assembly operations, thereby reducing production complexity and cost while maintaining design flexibility through the integrated geometry.
4Ease of manufacture
If the ring collar thickness is reduced to enable reshaping, then the reshaping process becomes feasible, but the available material for forming the securing thread is insufficient
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by establishing the thickness ratio range of 0.45-0.75. This optimized parameter ensures that the ring collar is thin enough to be successfully reshaped without excessive stress, yet thick enough to provide sufficient material for forming a secure, sufficiently long thread after reshaping.
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 simplifies the reshaping process, ensures a wide inner end surface for secure thread formation, and enhances the securing effect by maintaining a plane, recess-free surface, thereby improving the clamping behavior and stability of the securing nut.
Implementation Method 1
cold forming processes such as cold extrusion are used to produce the blanks or the securing screws
Implementation Method 2
the axially resilient or elastically deformable property of the shaped collar creates a spring or tensioning effect on the screw
Data Source
AI summary
A securing nut and a screw-nut blank for producing the securing nut are disclosed. The securing nut (20) has a shaped collar (8) on an end surface (3), in one piece with the nut body (1), and an inner end surface (11) running concentrically relative to an internally threaded bore (9) of the nut body (1). Nut (20) is spaced axially (A) from the internally threaded bore (9) and has a securing internal thread (22) offset relative to an internal thread (23) of the internally threaded bore (9). The screw-nut blank (10) has an axially running annular collar (2) to form the shaped collar (8), and has a contour which remains constant in the circumferential direction. In the axial direction (A), the annular collar (2) has a cross-sectional shape which increases as the distance from the end surface (3) increases, in particular a conical cross-sectional shape. The ratio of a thickness (S1) of the annular collar (2) in the transition portion (6) with respect to the end surface (3) to a thickness (S2) of the annular collar (2) at a free end (7), which is used to form the inner end surface (11), is between 0.45 and 0.75, preferably between 0.5 and 0.7.