Wedge Cutting Insert Layout for Interference-Free Gear Cutters
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Solution Overview
Problem
Existing gear cutters face manufacturing challenges due to interference issues during tool body production, leading to machining errors and increased costs, particularly when forming screw holes, and require multiple cutting inserts for tooth profile creation.
Innovation Solution
A replaceable cutting insert with a wedge-shaped design featuring a mounting hole that penetrates the peripheral side face, allowing for increased elevation angles and preventing interference during screw hole formation, and utilizing a single cutting insert for both tooth faces of the gear profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a screw hole is formed in the protruding strip part to manufacture the tool body, then the tool body can be manufactured, but the tap or drill interferes with the projecting strip part on the adjacent mountain, making it difficult to manufacture the tool body
Solution Approach 1:
The invention applies asymmetry by designing the mounting hole center axis to be inclined relative to the inner side face, rather than perpendicular. This asymmetric angular relationship creates sufficient clearance between the tap/drill and the adjacent projecting strip part, eliminating the interference problem while maintaining manufacturability of the tool body
Solution Approach 2:
The invention introduces a new dimensional parameter - the inclination angle of the mounting hole center axis relative to the inner side face. By changing from a perpendicular arrangement (zero inclination) to an inclined arrangement (non-zero inclination), the patent creates additional spatial clearance that resolves the interference issue between the tapping operation and adjacent projecting strip parts
2Ease of manufacture
If a cutting pocket is made in the protruding strip part to avoid interference with the tap, then the tool body can be manufactured, but the throwaway chip cannot be disposed at the cutting pocket portion, increasing design limitation
Solution Approach 1:
The invention performs preliminary action by pre-inclining the mounting hole center axis relative to the inner side face during the design stage. This preliminary angular configuration ensures that subsequent tapping or drilling operations will not interfere with adjacent projecting strip parts, eliminating the need for post-design modifications like cutting pockets and preserving full design flexibility for chip disposal
3Object-affected harmful factors
If multiple protruding strip parts are assembled to form the tool body, then the screw hole can be formed without interference, but machining errors are accumulated and manufacturing cost increases
Solution Approach 1:
The invention merges the mounting hole formation with the overall tool body structure by integrating the inclined hole design into the monolithic or integrally-formed tool body. This merging approach eliminates the need for separate assembly of multiple protruding strip parts, thereby preventing accumulation of machining errors and maintaining high dimensional accuracy while still avoiding tap interference through the inclined hole configuration
Data Source
AI summary
A cutting insert which is excellent both in manufacturing performances and dimensional precision and forms a pair with a tool body and a gear cutter including the cutting insert are provided. A cutting insert has a first face which is a rake face, a second face, a peripheral side face, and a mounting hole. On a ridge line where the first face and the peripheral side face cross each other, a cutting blade is formed. The cutting blade includes a corner part capable of machining a tooth bottom of a gear, and a main part extending to the corner part. The peripheral side face includes an inner side face in contact with a tool body and a first flank facing the main part. The mounting hole penetrates the first flank and the inner side face so that a center axis crosses the inner side face perpendicularly. The cutting insert is formed having a wedge shape such that thickness of the first flank and the inner side face becomes smaller as it goes from one end to the other end.