Cutting Tool Key Groove Alignment Without Movable Keys
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Solution Overview
Problem
Existing cutting machines face issues with rotational accuracy due to phase variations and slippage between tool ends and bushing components, leading to interference and operational malfunctions from cutting chips entering movable keys.
Innovation Solution
A cutting machine design featuring a tool with a convex portion and a rotating body with complementary inclined surfaces and guide surfaces that align phases upon insertion, ensuring stable engagement without interference from cutting chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If movable keys are provided at the lower end parts of the tools to align phases with bushes, then the phases in the direction of rotation can be made to coincide, but cutting chips may enter into the moving portions of the movable keys, causing them not to operate properly
Solution Approach 1:
The movable key structure is completely removed from the tool. Instead, a fixed convex portion is provided on the tool that engages with a complementary groove in the rotating body. This extraction of the movable component eliminates the problem of cutting chips entering moving portions while maintaining the phase alignment function through the fixed engagement structure.
Solution Approach 2:
Instead of having the key move within the bush to achieve phase alignment, the design inverts the approach by having the bush (rotating body) rotate relative to the fixed tool. The convex portion on the fixed tool engages with the groove in the rotating bush, reversing which component moves and eliminating the need for movable keys.
2Measurement precision
If movable keys are provided at the lower end parts of the tools, then phase alignment can be achieved, but the movable keys and bushes may interfere with each other when inserted with key grooves out of phase
Solution Approach 1:
The movable key mechanism is removed entirely. The fixed convex portion on the tool combines with the groove in the rotating body to provide both phase alignment and insertion guidance simultaneously, eliminating the interference problem that occurred with movable keys and out-of-phase grooves.
Solution Approach 2:
The twisted inclined surfaces on the convex portion and complementary guide surfaces on the groove are designed to automatically align the phases during the insertion process itself. This preliminary alignment action occurs as the tool is being inserted, so phase coincidence is achieved before the tool reaches its final operational position, preventing interference.
3Measurement precision
If fixed movable keys are provided on tools, then phase alignment can be achieved, but cutting chips generated by the cutting machine may enter into the moving portions causing operational malfunctions
Solution Approach 1:
The movable key structure is completely extracted from the tool design. The phase alignment function is transferred to the engagement between the fixed convex portion on the tool and the groove in the rotating body. This eliminates the moving portions that are vulnerable to cutting chip interference while maintaining precise rotational phase accuracy.
Solution Approach 2:
The design inverts which component contains the moving elements - instead of the tool having movable keys, the rotating body rotates within the fixed tool structure. The fixed convex portion on the tool engages with the rotating groove, placing the moving elements in the rotating body where they are protected from cutting chip contamination.
Data Source
AI summary
A cutting machine is provided with, at a distal end of a tool, a key protrusion that has a tapered section. The distal end of the tool can be inserted into an insertion hole of a bushing. The insertion hole is provided with a key groove into which the key protrusion is inserted. The tapered section of the key protrusion has first and second inclined surfaces. The first inclined surface is a surface twisted clockwise with respect to the axial center of the tool. The second inclined surface is a surface twisted counterclockwise with respect to the axial center of the tool. A tapered groove section of the key groove has first and second guide surfaces.