Roll Grooving Tool With Adjustable Die Offset Under Push-Back Forces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing roll grooving tools face challenges in efficiently forming grooves in pipes due to limited control over the die's position and the inability to handle significant push-back forces during the grooving process, leading to potential die back-off and reduced precision.
Innovation Solution
A handheld roll grooving tool with a dual-motor system, where one motor rotates the spindle and another motor varies the distance between the die axis and the drive axis, allowing for precise groove formation and withstanding push-back forces through a worm gear and spur gear mechanism, ensuring the die remains engaged with the pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical roll grooving tool is used to form a groove in a pipe, then the groove can be formed by deforming the pipe material, but the tool cannot effectively handle significant push-back forces during the grooving process, leading to die back-off and reduced precision
Solution Approach 1:
The die shaft is made rotatable about its own axis, allowing the die to dynamically adjust its position and maintain engagement with the pipe under push-back forces. This dynamic capability enables the die to self-correct and prevent back-off, ensuring both reliable engagement and precise groove formation.
Solution Approach 2:
The drive assembly pre-loads the die against the pipe surface before the grooving operation begins. This preliminary action ensures the die is already engaged and positioned correctly, preventing back-off during the actual grooving process and maintaining precision throughout the operation.
2Manufacturing precision
If the die shaft is made rotatable to vary the distance between die axis and drive axis, then precision is improved, but the device complexity increases due to additional drive mechanisms
Solution Approach 1:
The spindle drive portion and die shaft drive portion are integrated into a single drive assembly. This merged design allows both the spindle rotation and die shaft rotation to be controlled by one coordinated system, reducing overall complexity while maintaining the precision benefits of the rotatable die shaft.
Solution Approach 2:
The drive assembly serves multiple functions: it rotates the spindle for tool rotation, rotates the die shaft for position adjustment, and provides pre-loading capability. This multi-functional design eliminates the need for separate mechanisms for each function, reducing device complexity while achieving precision groove formation.
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 tool effectively forms grooves in pipes with enhanced precision and stability, capable of handling significant push-back forces without requiring additional locking mechanisms, ensuring consistent groove formation across various pipe materials.
Implementation Method 1
The drive assembly includes a worm gear and a spur gear. The worm gear is coupled to the second motor and the spur gear. The spur gear is coupled to the die shaft. When the second motor rotates the worm gear, the worm gear rotates the spur gear, which in turn rotates the die shaft and varies a spacing between the die axis and the drive axis.
Implementation Method 2
The drive assembly includes a worm gear and a spur gear. The worm gear is coupled to the second motor and the spur gear. The spur gear is coupled to the die shaft.
Data Source
AI summary
A tool configured to form a groove in a pipe includes a housing, a spindle rotatable about a drive axis, a die shaft defining a die shaft axis, a die rotatably coupled to the die shaft about a die axis that is offset relative the die shaft axis, the die configured to form a groove into the pipe, anda drive assembly. The drive assembly includes a spindle drive portion configured to rotate the spindle about the drive axis and thereby rotate the tool with respect to the pipe, and a die shaft drive portion configured to rotate the die shaft to vary a distance between the die axis and the drive axis.