Tap Holder Elastic Locking Absorbs Synchronization Errors
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Solution Overview
Problem
Existing tap holders for machine tools face synchronization errors between spindle feeding and rotation, leading to deviations in screw thread formation due to servo delay, and previous solutions complicate structures and increase costs.
Innovation Solution
A tap holder design featuring a tapper body and tap collet with an elastic member that absorbs synchronization errors through axial movement, using a locking member with through-holes and elastic members to ensure precise alignment and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If floats are provided on both sides in axial direction of tap holder to prevent incoincidence, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent removes the floats from the tap holder structure entirely, relying instead on the elastic member within the locking mechanism to absorb synchronization errors. This extraction of unnecessary components simplifies the overall device while maintaining functionality.
Solution Approach 2:
The elastic member acts as an intermediary element between the locking member and the tap collet, absorbing synchronization errors without requiring complex float mechanisms. This intermediary component provides a simple yet effective solution to the synchronization problem.
2Adaptability or versatility
If tap holder is separated into tapper body and tap collet to allow size change, then adaptability is improved, but device complexity increases
Solution Approach 1:
The tap holder is divided into a tapper body and a separable tap collet, allowing different sized collets to be exchanged based on tap size requirements. This segmentation provides adaptability while keeping each component relatively simple in structure.
Solution Approach 2:
The tapper body serves as a universal component that can accommodate different sized tap collets through the standardized locking mechanism with elastic member, providing multi-functionality without requiring multiple complete tap holder assemblies.
3Reliability
If lock bolt is used to lock tap to tap holding shaft, then reliability is improved, but device complexity increases
Solution Approach 1:
The elastic member within the locking mechanism provides automatic compensation for synchronization errors without requiring additional locking bolts or complex adjustment mechanisms. The system serves itself by using the elastic deformation of the member to maintain reliable locking.
Solution Approach 2:
The locking mechanism utilizes changes in the elastic properties of the elastic member to accommodate synchronization variations, providing reliable locking through parameter changes rather than through additional mechanical components like lock bolts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively absorbs synchronization errors between spindle feeding and rotation, maintaining high accuracy and productivity while reducing costs by simplifying the structure and allowing for easy replacement of elastic members to address wear or material differences.
Implementation Method 1
an elastic member is provided within the through hole penetrating the tap collet in a diameter direction, and the locking member engages the tap collet and the tapper body in a state of interposing the elastic member on both sides in an axial direction between the locking member and the tap collet
Data Source
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AI summary
It is an object of the invention to provide a tap holder in which even when an error is brought about in synchronizing spindle feeding and rotation of a tapper body and a tap collet of a tap holder in correspondence with a machine tool spindle, the synchronization can be established by absorbing the error by a simple constitution. As means therefor, the tap holder is characterized in that a tapper body 20 and a tap collet 50 are inserted by a locking member 70 at portions of the tapper body 20 and the tap collet 50 overlapping each other, and the tap collet 50 is fixed to the tapper body 20 by engaging the locking member 70 with at least one of the tap collet 50 and the tapper body 20 in a state of being interposed with an elastic member 78 on both sides thereof in an axial direction X.