Clamping Tool With Differential Threads For Rigid Collet-Free Holding
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Solution Overview
Problem
Existing clamping tools with differential thread fastening means face challenges in achieving accurate and stable clamping due to multiple degrees of freedom, which affect rigidity and clamping force, particularly in the slits of the collet and the space between the collet and the shaft of the cutting tool.
Innovation Solution
A clamping tool design featuring a holder with a rearwardly tapering bore and a tool with a rearwardly tapering rear portion, both with threads of different pitches, where the tool's rearwardly tapering rear portion abuts the holder's bore, providing a mechanical advantage and increased clamping force through precise angular alignment and thread engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collet with slits is used to clamp the cutting tool, then the tool can be secured within the holder, but the multiple degrees of freedom in the slits and space between collet and tool shaft reduce clamping accuracy and stability
Solution Approach 1:
The patent removes the collet component with its slits from the clamping mechanism. Instead of using a collet that requires radial closure through slits, the invention directly engages the cutting tool shank with the holder through threaded connections, eliminating the source of multiple degrees of freedom and improving both clamping accuracy and stability
Solution Approach 2:
The patent merges the functions of the collet, tool holder, and clamping mechanism into a more integrated system. The holder directly receives and secures the cutting tool through the connector member with differential threads, reducing the number of separate components and interfaces that could introduce degrees of freedom
2Ease of operation
If a connector member with differential threads is used, then the tool can be axially displaced and clamped, but the complex thread engagement creates multiple degrees of freedom affecting rigidity
Solution Approach 1:
The patent applies different thread pitches at different locations on the connector member. The first thread connection has a first pitch for engaging the holder, while the second thread connection has a second pitch for engaging the cutting tool. This local differentiation in thread properties enables controlled axial displacement during assembly while maintaining rigidity in the final clamped state
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
The design achieves rigid and accurate clamping by minimizing unnecessary degrees of freedom, enhancing torque transfer and machining power while reducing tool breakage due to more stable operating conditions.
Implementation Method 1
a connector having a generally cylindrical shape and a connector through bore that extends from a front end of the connector to a rear end of the connector, the connector has a first connector thread having a pitch similar to the first pitch, and, a second connector thread having a second pitch, the second pitch being different from the first pitch
Data Source
AI summary
A clamping tool includes a holder, a connector and a tool. The holder has a rearwardly tapering bore and a holder thread having a first pitch. The connector has a cylindrical shape and a connector through bore. The connector further has a first connector thread having a pitch similar to the first pitch, and a second connector thread having a second pitch that is different from the first pitch. The tool has a rearwardly tapering rear portion and a tool thread having a pitch similar to the second pitch. In an assembled position, the rearwardly tapering rear portion of the tool abuts the rearwardly tapering bore of the holder, the holder thread is threadingly engaged with the first connector thread, and the tool thread is threadingly engaged with the second connector thread.