Threaded Member Tightening Tool Drive Time Setting
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Solution Overview
Problem
Existing threaded member tightening tools face challenges in setting the optimal drive time for switching from high-speed to low-speed rotation, leading to potential breakage of threaded members or increased tightening time, requiring repetitive testing for each type of threaded member.
Innovation Solution
A threaded member tightening tool with an electric motor and control unit that measures the tightening time at a setting rotational speed, calculates an initial high-speed drive time, and adjusts it based on predetermined values to ensure the threaded member is not tightened at high speed, allowing for automatic setting without repetitive testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drive time is set excessively long, then the threaded member may be seated in a state where the tightening tool is being rotationally driven at high speed, but the time required to complete tightening of the threaded member is reduced
Solution Approach 1:
The control unit preliminarily determines the high-speed drive time based on the relationship between rotational speed and tightening time obtained from preliminary measurements. This preliminary action allows the system to pre-calculate the optimal high-speed drive time that prevents threaded member breakage while maintaining efficient tightening, eliminating the need for repetitive testing for each threaded member type.
2Reliability
If the drive time is set excessively short, then the threaded member integrity is maintained, but the time required to complete tightening of the threaded member increases
Solution Approach 1:
The control unit changes the operational parameters by determining the high-speed drive time based on the measured relationship between rotational speed and tightening time. By calculating the appropriate high-speed drive time using the formula involving the positive value less than 1 and the rotational speed ratio, the system optimizes both reliability and productivity, avoiding threaded member breakage while maintaining efficient tightening completion.
3Measurement precision
If repetitive testing is performed to set the drive time, then the optimal drive time is determined, but the setting process becomes troublesome and time-consuming
Solution Approach 1:
The tightening tool performs self-service by automatically measuring the tightening time at setting rotational speed and calculating the appropriate high-speed drive time using the stored relationship data. The control unit executes the determination process autonomously without requiring repetitive manual testing, thereby maintaining measurement precision while significantly improving ease of operation.
4Measurement precision
If the setting of drive time is performed manually through repetitive testing, then the optimal time is found, but the process must be repeated every time the type of threaded members changes
Solution Approach 1:
The control unit implements a universal solution by storing the relationship between rotational speed and tightening time in its memory and using this data to calculate appropriate high-speed drive times for different threaded member types. This multi-functional approach allows the system to adapt to various threaded member types without requiring repetitive testing, maintaining measurement precision while improving versatility.
Data Source
AI summary
A threaded member tightening tool for setting the length of drive time to elapse before rotation is switched from high-speed rotation to low-speed rotation. A motor-driven screwdriver system in which a screwdriver bit is first driven at a predetermined high rotational speed only for a high-speed drive time and thereafter driven at a predetermined low rotational speed lower than the high rotational speed. A control unit drive-controls an electric motor so that the screwdriver bit is rotationally driven at a setting rotational speed, measures a tightening time required until a Hall element detects that a threaded member engaged with the screwdriver bit has been tightened completely, calculates an initial setting time by multiplying the tightening time by a predetermined positive value less than 1 and a value obtained by dividing the setting rotational speed by the high rotational speed, and sets the high-speed drive time to the initial setting time.