Conic Rotary Cutter Geometry for Damaged Bolt Thread Removal
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Solution Overview
Problem
Existing rotary cutters face inefficiencies when cutting damaged threads on bolts due to friction and mismatched cutting angles, leading to poor cutting results and low efficiency, especially when dealing with bolts of varying diameters.
Innovation Solution
A rotary cutter design featuring a conic cutting space with multiple cutting blades, evasive grooves, and scrap discharge grooves, allowing only the cutting blades to contact the bolt, reducing friction and enabling efficient cutting of bolts with different diameters by adjusting cutting angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a screw die is used to cut the bolt, then the damaged portion can be removed, but the alignment process is time-consuming and efficiency is low
Solution Approach 1:
The rotary cutter divides the cutting function into multiple cutting blades arranged around the circumference, allowing simultaneous engagement with the bolt surface. This eliminates the need for precise alignment while maintaining cutting effectiveness, as multiple blades work together to remove damaged material efficiently.
Solution Approach 2:
The cutting blades are pre-positioned at optimal angles on the rotary cutter body before operation. This preliminary arrangement of cutting edges at various angles ensures that when the cutter rotates, the blades automatically engage the bolt surface at the correct orientation without requiring alignment procedures during operation.
2Ease of operation
If the rotary cutter rotates at constant speed, then operation is simplified, but cutting speed varies with bolt diameter leading to poor cutting results
Solution Approach 1:
Different cutting blades are positioned at different radial distances from the rotation axis, creating local variations in cutting speed. Blades engaged with larger diameter portions of the bolt travel faster, while blades at smaller radii travel slower, automatically compensating for diameter variations and maintaining consistent cutting quality across different bolt sizes.
Solution Approach 2:
The invention introduces a radial dimension to the cutting blade arrangement, positioning blades at multiple radii rather than at a single distance from the axis. This dimensional variation allows the system to handle different bolt diameters effectively, as each radius provides appropriate cutting speed for its corresponding engagement point on the bolt.
3Device complexity
If the cutting angle is fixed, then the structure is simple, but friction occurs between the inner wall face and the bolt
Solution Approach 1:
The cutting function is segmented into multiple blades positioned at different angular locations around the rotary cutter. This segmentation allows only the actively engaged cutting edges to contact the bolt, while other portions of the inner wall face remain clear of the workpiece, eliminating friction between non-cutting surfaces and the bolt.
Solution Approach 2:
The harmful friction-contact portions of the inner wall face are extracted or removed from the functional interaction with the bolt. By positioning cutting blades such that only the cutting edges engage the workpiece and designing the inner periphery to avoid contact, the invention eliminates unnecessary friction while maintaining structural simplicity.
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 an inner periphery delimiting a conic cutting space. The body further includes at least one cutting blade, an evasive groove, an evasive portion, a scrap discharge groove, a scrap guide groove and a scrap discharge orifice on the inner periphery delimiting the cutting space. The at least one cutting blade forms a ridge. The evasive groove and the scrap discharge groove are respectively located on a rear side and a front side of the at least one cutting blade along a circumferential direction of the inner periphery of the body. The scrap guide groove extends between the evasive groove and the scrap discharge orifice.