Cutter Holder Assembly With Spring-Ball Gap Elimination
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Solution Overview
Problem
Conventional cutter holder assemblies suffer from a longitudinal assembling gap between the cutter and the collet, leading to reduced assembly accuracy and cutter instability during rapid spinning.
Innovation Solution
A cutter holder assembly is designed with a collet featuring a positioning groove with a guiding channel and a limiting groove, and a resilience tightening set that includes a spring and a position ball to securely engage the cutter with the collet, reducing the assembling gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the positioning groove size is slightly larger than the positioning protrusion to ensure smooth insertion, then the ease of operation is improved, but the manufacturing precision deteriorates due to the formed gap reducing assembly accuracy
Solution Approach 1:
The positioning groove is segmented into two functional parts: a guiding channel for smooth insertion and a limiting groove for precise positioning. This segmentation allows the groove to perform both easing insertion and maintaining assembly accuracy without compromise
Solution Approach 2:
The position ball acts as an intermediary element between the cutter body and collet. It transmits the spring's pushing force to eliminate the assembly gap while allowing the positioning protrusion to engage with the limiting groove for precise positioning
2Ease of manufacture
If the positioning groove is larger than the positioning protrusion to facilitate assembly, then the ease of manufacture is improved, but the stability deteriorates due to cutter shaking during rapid spinning
Solution Approach 1:
The positioning groove is divided into a guiding channel for easy assembly and a limiting groove for stability. The limiting groove works with the position ball to eliminate gaps and prevent cutter shaking during high-speed operation
Solution Approach 2:
The spring and position ball are pre-installed in the mounting cavity to create a preliminary pushing force. This pre-tensioning action ensures the cutter body is firmly pressed against the collet before operation begins, preventing instability during rapid spinning
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 solution effectively reduces the longitudinal assembling gap, enhancing assembly accuracy and stabilizing the cutter during operation, thereby preventing shaking and ensuring secure mounting.
Implementation Method 1
a spring disposed in the spring room, and a position ball movably disposed in the spring room, partially protruding out of the opening of the spring room, and pushed by the spring
Data Source
AI summary
A cutter holder assembly has a cutter holder, a collet disposed in the cutter holder and having a positioning groove and a mounting cavity, a cutter set mounted in the collet, and a resilience tightening set mounted in the mounting cavity of the collet. The cutter set includes a cutter body and a positioning protrusion engaged with a limiting groove of the positioning groove. The resilience tightening set includes a spring room, a spring disposed in the spring room, and a position ball movably disposed in and partially extending out of the spring room. The position ball is pushed by the spring to push the cutter set to keep the positioning protrusion tightly abutting against a surface of the limiting groove, thereby reducing a longitudinal assembling gap between the cutter set and collet.