Tube Prep Bit With Staged Blades for Deburring and Swaging
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Solution Overview
Problem
Cutting tubes with saws or pipe cutters often results in tapered ends and burrs, which hinder the achievement of a fluid-tight seal when attaching tubes to fittings due to turbulent flow and potential damage to seals.
Innovation Solution
A rotary bit with a deburring and swaging mechanism, featuring leading and finishing blades, and optionally a finishing collar, designed to remove burrs and expand the tube end to its original diameter, ensuring a smooth, conical-shaped end for secure and leak-free connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a saw or pipe cutter is used to cut the tube, then the tube can be cut to the desired length, but the tube end becomes tapered or conical-shaped with burrs
Solution Approach 1:
The rotary bit performs preliminary deburring and swaging actions on the tube end immediately after cutting. The leading blades remove burrs before the tube is inserted into the fitting, and the swaging action pre-forms the tube end to its proper cylindrical geometry, preventing the tapered shape from interfering with the fitting connection.
Solution Approach 2:
The rotary bit changes the geometric parameters of the tube end by removing material (deburring) and plastic deformation (swaging). The blades transform the tapered, burr-covered end into a smooth cylindrical end with the original outer diameter, altering the shape parameters to match fitting requirements.
2Ease of manufacture
If the tube has a conically-shaped end and/or burrs, then cutting is simpler, but the fluid flow becomes turbulent and seals can be damaged
Solution Approach 1:
The invention converts the harmful tapered shape and burrs created by cutting into a beneficial smooth cylindrical end. The deburring blades remove the harmful burrs, and the swaging action uses the cutting-induced deformation to plastic-flow the metal into the desired cylindrical shape, turning the cutting defect into a preparation opportunity.
Solution Approach 2:
The rotary bit applies preliminary anti-action by removing burrs and counteracting the tapered shape before the tube contacts the fitting. The deburring blades cut away burrs that would otherwise damage seals, and the swaging action pre-resists the tapering force by forcing the tube end back to its original diameter.
3Manufacturing precision
If the tube end is deburred and swaged using a rotary bit, then the tube end becomes smooth and cylindrical, but additional processing time is required
Solution Approach 1:
The rotary bit merges two separate operations—deburring and swaging—into a single tool and single pass. The leading blades perform deburring while the swaging surface performs the swaging action simultaneously as the tube is inserted, eliminating the need for separate deburring and swaging steps.
Solution Approach 2:
The rotary bit is a multi-functional tool that combines cutting (deburring blades) and forming (swaging surface) capabilities in one device. This universal tool replaces what would traditionally require multiple specialized tools and operations, reducing total processing time despite adding a preparation step.
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 rotary bit effectively deburrs and swages the tube ends, preventing turbulent flow and seal damage, thereby ensuring a reliable fluid-tight connection when attaching tubes to fittings.
Implementation Method 1
a first end including a plurality of blades that extend axially along the first end and radially outward from the rotary bit, the plurality of blades including a plurality of leading blades and a plurality of finishing blades, the leading blades configured to initially deburr and swage the end of the tube
Implementation Method 2
a swaging surface configured to radially expand a diameter of the tube end to the original outer diameter of the tube
Data Source
AI summary
A rotary bit configured to deburr and swage an end of a tube, comprising a first end configured to deburr and swage the end of the tube, and a second end configured to be secured to a rotary device, wherein the first end includes a plurality of blades that extend axially along the first end and radially outward from the rotary bit, the plurality of blades including a plurality of leading blades and a plurality of finishing blades, the leading blades configured to initially deburr and swage the end of the tube upon insertion of the rotary bit into the end of the tube, and the finishing blades configured to complete deburring and swaging of the end of the tube, the finishing blades extending radially outward from the rotary bit to a greater extent than the leading blades.