Turret Tool Rest Drive Mechanism With Switchable Transmission Accuracy
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Solution Overview
Problem
Existing rotational force transmission mechanisms in lathes and turret tool rests lack the ability to switch between different levels of accuracy, leading to inefficiencies and potential tool damage during machining processes.
Innovation Solution
A rotational force transmission mechanism featuring a shaft and engagement member with inclined surfaces, allowing the engagement member to move between two positions, thereby adjusting the gap between the shaft and the tool holder to achieve either fair or high accuracy in rotational force transmission without requiring tool replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed engagement structure is used between shaft and tool holder, then structural simplicity is maintained, but rotational force transmission accuracy cannot be switched or adjusted
Solution Approach 1:
The engagement member is designed to be movable along the shaft axis between two distinct positions: a first position for fair accuracy transmission and a second position for high accuracy transmission. This dynamic adjustability allows the system to switch between different accuracy levels based on machining requirements, resolving the contradiction between fixed simplicity and adjustable precision.
Solution Approach 2:
The system changes the engagement parameter (position of engagement member) to achieve different accuracy levels. By moving the engagement member between two positions along the shaft, the engagement geometry changes, thereby switching the rotational force transmission accuracy between fair and high levels without changing the fundamental structure.
2Manufacturing precision
If engagement member moves to second position for high accuracy, then gaps are minimized and machining precision improves, but the structure becomes more complex requiring inclined surfaces and movable mechanisms
Solution Approach 1:
The accuracy adjustment function is extracted as a separate movable engagement member that can be positioned independently along the shaft. This allows the high-accuracy engagement configuration to be activated only when needed, rather than being a permanent complex structure, thus reducing overall system complexity while maintaining precision capability.
3Device complexity
If a simple groove-protrusion engagement is used, then device complexity is low, but rotational force transmission accuracy cannot be adjusted between fair and high levels
Solution Approach 1:
The engagement mechanism is segmented into multiple functional components: the shaft with groove, the engagement member with protrusion and inclined surface, and the tool holder with corresponding engagement features. This segmentation allows independent optimization of each component and enables the switching mechanism between different accuracy levels while keeping individual components relatively simple.
Data Source
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AI summary
A rotational force transmission mechanism includes: a shaft rotatable about a first axis; and an engagement member movable about along the first axis between a first position and a second position and rotatable about the first axis by rotation of the shaft. The shaft includes a receiving portion that receives at least a part of a rotatable portion of a tool holder. At least one of the shaft and the engagement member has an inclined surface that moves an engagement portion of the engagement member in a direction toward the first axis when the engagement member moves from the first position to the second position.