Bolt Axial Force Measurement Supersonic Wave Recess
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Solution Overview
Problem
Existing methods for forming bolts with angular polygonal outlines and measuring axial force using supersonic waves are limited by the size of the probe and require multi-stage processes, making accurate axial force measurement difficult due to small plane end faces and interference issues.
Innovation Solution
A bolt with a polygonal shaped outline and spiral thread, where a recess with a projection having a plane upper face is formed on the bolt head, allowing for axial force measurement without size limitations, and the C-face part is formed by stretching the spiral thread, enabling easy insertion into female screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a recess is formed on the bolt head to enable axial force measurement with a supersonic wave probe, then axial force measurement becomes possible, but the probe size is limited by the recess size
Solution Approach 1:
The invention transitions from a two-dimensional surface measurement (probe on bolt head surface) to a one-dimensional internal measurement (probe inserted through recess into bolt shaft axis). By moving the measurement interface to the bolt shaft axis and using the bolt shaft itself as the wave transmission path, the probe size constraint is eliminated while maintaining measurement capability.
2Shape
If a recess is formed on the bolt head to give an angular polygonal shaped outline, then the bolt head achieves the desired angular shape, but the plane end face area becomes small making accurate measurement difficult
Solution Approach 1:
The invention extracts the measurement function from the bolt head surface (where space is limited by the recess) and relocates it to the bolt shaft axis (where space is abundant). The probe is inserted through the recess and contacts the bolt shaft axis, utilizing the extended measurement path along the bolt shaft to achieve accurate measurement without being constrained by the small recess area.
3Shape
If multi-stage processes are used to form the bolt head with recess and C-face part, then both features are formed, but the manufacturing process complexity increases
Solution Approach 1:
The invention merges the formation of the recess and the C-face part into a single cold forging process. The bolt head forging mold includes both the recess forming portion (that creates the polygonal recess with internal projection) and the C-face part forming portion (that creates the tapered end), allowing both features to be formed simultaneously in one operation rather than requiring separate machining steps.
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
The solution allows for accurate and efficient axial force measurement and easy insertion into female screws, reducing the complexity of the manufacturing process and accommodating probes of various sizes.
Implementation Method 1
send the supersonic wave generated in said axial force detector into the bolt through said supersonic wave sending and receiving probe from the upper end of the bolt head, so as to reflect said supersonic wave onto said flat plane face at the end of the bolt shaft, then receiving said reflected supersonic wave with said supersonic wave sending and receiving probe
Implementation Method 2
measure the time elapsed from the input of said supersonic wave to the receiving of the reflected supersonic wave, with the axial force of the bolt being calculated based on said elapsed time
Data Source
AI summary
The object of the present invention is to provide a bolt, the axial force of which can be measured by a supersonic wave, or the like, with high accuracy and which can be manufactured in a shortened process.A bolt 1 having an angular polygonal shaped bolt head 2 is provided in the present invention. A recess 4 is formed on the bolt head 2 and a projection 5 having a plane upper face 6 is formed on the inner side of the recess 4, and at the end of the bolt shaft 3, a plane end face 8 is formed, and a wall, the outside of which being a C-face part is formed around the plane end face 8.