Tapered Collet Tool Holder for Stable Axial Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tool holders fail to provide stable holding for cutting tools, especially in high-speed and high-precision machining applications, due to large tolerances and movement of the cutting tools during operation.
Innovation Solution
A tool holder design featuring a holder body, tapered collet, and side lock bolts that engage with a specially machined cutting tool shank, reducing axial and depth tolerances to very small values, and utilizing a keyway and flat portions for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional collets are used to attach cutting tools, then the structure is simple, but the cutting tool cannot be held stably during high-speed machining
Solution Approach 1:
The tool holder is divided into multiple functional components: a collet for radial clamping, side lock bolts for axial positioning, and a key for rotational locking. Each component performs a specific function, collectively achieving stable tool holding without requiring an overly complex integrated structure.
Solution Approach 2:
The cutting tool shank is pre-machined with a side lock recess before assembly. This preliminary machining ensures precise geometric compatibility with the key and side lock bolts, enabling stable holding without requiring complex adjustment mechanisms during assembly.
2Reliability
If standard shank tolerances are used, then manufacturing is easier, but axial movement occurs during ultra-cutting operations
Solution Approach 1:
The side lock recess dimensions are changed from standard tolerances to very small tolerances (0.005mm or less in axial direction and depth). This parameter change ensures precise engagement with the key, preventing axial movement during high-force ultra-cutting operations.
Solution Approach 2:
The side lock recess geometry is precisely copied from the key geometry, ensuring perfect complementary fit. This copying approach transfers the precision requirements directly to the recess machining, enabling reliable axial positioning.
3Reliability
If a single lock mechanism is used, then the structure is simpler, but the cutting tool can rotate or slip during operation
Solution Approach 1:
The locking function is segmented into three independent mechanisms: the collet for radial clamping, side lock bolts for axial positioning, and a key for rotational locking. This segmentation allows each mechanism to specialize in one aspect of tool securing, achieving comprehensive stability without requiring a single overly complex locking system.
Solution Approach 2:
Multiple locking functions are merged into a unified tool holder assembly where the collet, side lock bolts, and key work together synergistically. The combination of these simpler components achieves the same effect as a single complex locking mechanism would require.
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 allows for reliable and stable holding of cutting tools, preventing axial movement during ultra-cutting operations, thereby enhancing machining precision and stability.
Implementation Method 1
a tapered collet (20), the outer diameter of an outer peripheral surface of the distal end region gradually increases toward a distal end of the collet
Implementation Method 2
The first side lock bolt passes through the first through hole, and a distal end of the first side lock bolt contacts the first flat portion of the collet. The second side lock bolt passes through the second through hole, and a distal end of the second side lock bolt contacts the second flat portion of the collet.
Implementation Method 3
The key fits in the keyway of the collet, contacts an inner peripheral surface of the front hole, and contacts the side lock recess in a rear end portion of the additionally machined cutting tool inserted into the tool insertion hole.
Data Source
AI summary
A tool holder includes a holder body, a tapered collet, a first side lock bolt, a second side lock bolt, and a key. The key fits in a keyway of the collet, contacts the inner peripheral surface of a front hole, and contacts a recess formed in a rear end portion of a cutting tool inserted into a tool insertion hole of the collet.