Screwing Tool 12-Point Profile Manufacturing
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Solution Overview
Problem
Existing screwing tools for threaded bolts and nuts with polygonal profiles often apply excessive stress, leading to wear and potential damage due to sharp edges and uneven torque distribution, especially when used with worn screw heads or nuts.
Innovation Solution
A method for producing screwing tools with a 12-point polygonal profile inner opening, formed by creating two identical recesses rotated 30 degrees relative to each other, with rounded sections and specific distance and radius dimensions to ensure gentle contact and even torque transmission, preventing edge loading and notch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a screwing tool with a polygonal profile having sharp edges is used to tighten threaded bolts and nuts, then the torque transmission is effective, but excessive stress is placed on the contact lines leading to wear and potential damage of the threaded bolts and nuts
Solution Approach 1:
The patent applies curvature by rounding the edges of the polygonal profile in the screwing tool. Instead of sharp edges, the profile features rounded corners with a specified radius (R1 for peaks, R2 for valleys). This curvature distributes the contact stress over a larger area during torque transmission, preventing excessive stress concentration on the contact lines between the tool and the threaded bolt or nut, thereby reducing wear and potential damage while maintaining effective torque transmission.
2Manufacturing precision
If the inner opening of the screwing tool has a polygonal profile with twelve points, then the fit with threaded bolts and nuts is improved, but the production complexity increases
Solution Approach 1:
The patent segments the formation of the twelve-point polygonal profile into two separate operations: first forming a six-point recess, then forming a second identical recess rotated by 30 degrees. This segmentation allows the use of a single processing tool for both operations, simplifying the manufacturing process while achieving the precise twelve-point profile required for optimal fit with threaded bolts and nuts.
Solution Approach 2:
The patent applies preliminary action by first creating the six-point recess with specific geometric parameters (peak radius R1, valley radius R2) before adding the second set of points. The preliminary six-point recess is designed with rounded peaks and valleys that will become part of the final twelve-point profile, ensuring that the curvature and dimensional tolerances are established early in the manufacturing process.
3Shape
If the processing tool forms recesses with sharp peaks and valleys, then the polygonal profile is well-defined, but the threaded bolts and nuts experience rounding at the contact lines
Solution Approach 1:
The patent resolves this contradiction by applying curvature to the peaks and valleys of the polygonal profile. The processing tool is designed to create rounded peaks with radius R1 and rounded valleys with radius R2, rather than sharp corners. This curvature maintains a well-defined polygonal profile shape while distributing contact stresses to prevent rounding of the threaded bolt or nut surfaces during tightening operations.
Data Source
Figure 1~4
AI summary
The invention relates to a method for manufacturing a screwdriving tool for threaded bolts and/or nuts with an inner opening (8) having a polygonal profile (3) with twelve points (2). To simplify the process and enable gentle screwdriving of threaded bolts and/or nuts, the invention proposes that a first recess (1) be formed in a block of material with six points (2) and a central center of gravity (4), and that a second recess (7) be formed with an identical center of gravity (4) to the first recess. The second recess is formed rotated 30 degrees relative to the first recess in the block of material such that twelve points (2) are formed in the inner opening (8), which are distributed at equal intervals around the circumference of the inner opening.wherein the tips are convex towards the inner opening and the areas between adjacent tips (2) are concave towards the inner opening (8) and wherein transition areas (6) between each tip and the areas adjoining the tips which are concave towards the inner opening are subsequently rounded.