Conical Rotary Cutter Geometry for Damaged Bolt Thread Repair
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Solution Overview
Problem
Existing rotary cutters face inefficiencies when cutting damaged threads on bolts of varying diameters, as they require precise alignment and have inconsistent cutting speeds, leading to suboptimal cutting results.
Innovation Solution
A rotary cutter design featuring a conic cutting space with multiple cutting blade sections of different angles and radii, allowing for adaptable cutting angles to accommodate bolts of different diameters, ensuring proper cutting and efficient scrap discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw die is used to cut the bolt, then rust and damaged portions can be removed, but precise alignment is required which is time-consuming and reduces efficiency
Solution Approach 1:
The rotary cutter is designed to self-align with the bolt threads through its conical cutting space geometry. The conical shape automatically guides the cutter to the correct position on the bolt, eliminating the need for manual precise alignment while maintaining cutting quality.
2Device complexity
If a rotary cutter with fixed cutting angle is used, then the structure is simple, but cutting results are poor when contact point changes with different bolt diameters
Solution Approach 1:
The cutting blades are designed with different local qualities - specifically, different cutting angles at different radial positions from the rotation axis. The first cutting blade has a first cutting angle for smaller bolts, while the second cutting blade has a second cutting angle for larger bolts. This allows each part of the cutter to be optimized for specific bolt diameters, improving cutting accuracy without requiring a completely complex adjustable mechanism.
3Ease of operation
If cutting speed is kept constant, then the operation is simple, but cutting results vary when bolt diameter changes
Solution Approach 1:
Different cutting blades are positioned at different radial distances from the rotation axis, creating local quality variations. The first cutting blade operates at a smaller radius while the second cutting blade operates at a larger radius. This geometric arrangement naturally creates different linear cutting speeds at different blades, allowing each blade to operate at an optimal speed for its intended bolt diameter range while maintaining simple constant rotational speed operation.
Data Source
AI summary
A rotary cutter for cutting damaged threads of a bolt includes a body rotatable about a rotating axis. The body includes a connecting end and an operative end. The body includes an inner periphery delimiting a cutting space extending along the rotating axis from the operative end towards but spaced from the connecting end. A width of the cutting space in a diametric direction perpendicular to the rotating axis gradually reduces from the operative end toward the connecting end to form a conic space. The body further includes at least one cutting blade disposed on the inner periphery. The at least one cutting blade includes a first cutting blade section and a second cutting blade section. The first cutting blade section is arcuate or rectilinear. The second cutting blade section is arcuate or rectilinear. The first and second cutting blade sections are not identical.