Blind Rivet Nut-Setting Tool With Dual-Motor Deformation Control
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Solution Overview
Problem
Existing powered blind rivet nut-setting tools face challenges in efficiently and reliably setting blind rivet nuts on workpieces, particularly in ensuring consistent plastic deformation and secure fastening.
Innovation Solution
The method involves using a blind rivet nut-setting tool with two motors: a first motor for rotating the output shaft to thread and couple the blind rivet nut, and a second motor for translating the output shaft to cause further plastic deformation and permanent setting of the blind rivet nut on the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used to both rotate and translate the output shaft, then the device complexity is reduced, but the manufacturing precision and reliability of blind rivet nut setting deteriorates
Solution Approach 1:
The patent divides the single motor function into two separate motors: a first motor dedicated to rotating the output shaft and a second motor dedicated to translating the output shaft. This segmentation allows each motor to be optimized for its specific function, improving the precision and reliability of both rotational and linear movements during the blind rivet nut setting process.
2Ease of operation
If manual operation is used to control the setting process, then the ease of operation is improved, but the productivity and consistency deteriorates
Solution Approach 1:
The patent incorporates sensors that detect the position of the output shaft and provide feedback to the control system. This feedback mechanism enables automatic control of the two motors, ensuring consistent and reliable setting operations while maintaining ease of use through automated decision-making based on real-time position data.
Solution Approach 2:
The system uses automated motor control based on sensor feedback to perform the setting operations without requiring manual intervention for each movement phase. The control system automatically coordinates the rotation and translation movements, improving productivity and consistency while keeping the operation simple for the user.
3Productivity
If the output shaft moves rapidly through the setting stroke, then the productivity is improved, but the manufacturing precision of plastic deformation deteriorates
Solution Approach 1:
The patent implements a multi-phase setting stroke with distinct periods: an initial rapid movement phase for efficiency, followed by a controlled deformation phase where the output shaft moves more slowly to ensure precise plastic deformation. This periodic variation in speed allows the system to maintain high productivity while achieving consistent manufacturing precision during the critical deformation phase.
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 ensures consistent and reliable setting of blind rivet nuts by achieving precise plastic deformation and secure fastening, improving the overall efficiency and effectiveness of the blind rivet nut-setting process.
Implementation Method 1
rotating the output shaft relative to the blind rivet nut causing plastic deformation of the blind rivet nut
Implementation Method 2
translating the output shaft along the longitudinal axis in the rearward direction, causing further plastic deformation of the blind rivet nut and permanently setting the blind rivet nut on the workpiece
Data Source
AI summary
A method of operating a blind rivet nut-setting tool includes pressing a blind rivet nut on an output shaft of the tool against a workpiece, thereby applying an external force to the output shaft to move the output shaft in a rearward direction along a longitudinal axis from a first position to a second position, activating a first motor to rotate the output shaft about the longitudinal axis in response to the output shaft activating a limit switch after reaching the second position, thereby rotating the output shaft relative to the blind rivet nut causing plastic deformation of the blind rivet nut, and activating a second motor to translate the output shaft along the longitudinal axis in the rearward direction, causing further plastic deformation of the blind rivet nut and permanently setting the blind rivet nut on the workpiece.