Tool Holder Locking Pin Structure for Axial Pullout Prevention
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Solution Overview
Problem
Existing toolholders struggle to reliably prevent axial pullout of tools during machining, leading to potential tool loss and compromised machining precision.
Innovation Solution
A clamping component with a movable locking pin and a tool retaining area, which is positioned to prevent axial pullout by being held within the locking pin bore on both sides of the overlapping area, ensuring the locking pin remains attached to the clamping component at all times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking pin is used to prevent axial pullout of the tool, then the tool retention reliability is improved, but the locking pin may be lost during tool changes
Solution Approach 1:
The locking mechanism is segmented into a locking pin and a locking groove, where the locking pin can be positioned in different states (engaged or disengaged) to provide both secure tool retention and safe tool removal. The locking pin is received in a locking pin bore that extends through the clampable component, allowing it to be moved between positions without being permanently fixed.
Solution Approach 2:
The locking pin is made movable between a first position (where it engages the locking groove to prevent pullout) and a second position (where it is disengaged to allow tool removal). This dynamic positioning is achieved through the locking pin bore and stop means that guide the locking pin's movement, transforming a static locking element into a dynamic one that can adapt to different operational states.
2Ease of operation
If the locking pin bore extends through the clampable component, then the locking pin can be moved between positions, but the locking pin may fall out
Solution Approach 1:
Stop means are provided in the locking pin bore to preliminarily define the positions of the locking pin. The first stop means engages the locking pin in the first position (locked state), and the second stop means engages it in the second position (unlocked state). This preliminary positioning prevents the locking pin from falling out while allowing controlled movement between positions.
Solution Approach 2:
The stop means act as intermediary elements between the locking pin and the locking pin bore. These stop means (which may be protrusions or recesses) mediate the interaction by providing defined engagement points that guide and limit the locking pin's movement, ensuring it remains within the bore while enabling position changes.
3Reliability
If the locking groove is provided in the tool shank, then axial pullout is prevented, but the tool shank requires special preparation
Solution Approach 1:
Instead of providing the locking groove in the tool shank (which requires special tool preparation), the locking groove is inverted to be provided in the clampable component itself. The locking pin on the tool engages with this groove in the clampable component, reversing which element has the groove and eliminating the need for special tool shank preparation while maintaining pullout prevention.
Data Source
AI summary
The clamping component according to the present disclosure has a locking pin movable between the first and the second position, which is provided with a tool retaining area formed between the ends of the locking pin. In the first position, the tool retaining area protrudes into a tool receiving bore of the clamping component, while in the second position, the locking pin does not protrude into the tool receiving bore. The locking pin is always attached to the clamping component in both the first and the second position, which makes the improved withdrawal protection particularly easy to use and ensures that it cannot be lost. The locking pin can be moved (steplessly) between the first and second position, whereby the tool retaining area of the locking pin in the first position prevents the tool from being drawn out of and rotated out of the tool receiving bore.