Replaceable Cutting Head Coupling With Conical Internal Thread Grip
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Solution Overview
Problem
Existing rotary cutting tools with threaded coupling mechanisms face challenges in achieving stable engagement between the male and female coupling members, leading to inadequate frictional retention and stability during cutting operations, particularly under lateral forces.
Innovation Solution
The implementation of a conical internal thread with a specific cone angle (0.02° ≤ γ ≤ 1.6°) in the tool holder's female coupling member, which engages with a straight external thread on the male coupling member, enhances frictional engagement from the forwardmost to the rearmost turn, improving stability against lateral cutting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If straight internal and external threads are used in the coupling mechanism, then the manufacturing is simpler, but the frictional engagement and stability under lateral forces are insufficient
Solution Approach 1:
The patent changes the geometric parameters of the internal thread by introducing a conical configuration with a specific cone angle (α) between 5° and 15°, while keeping the external thread straight. This parameter modification increases the contact area and frictional engagement between the threads, thereby improving reliability without significantly complicating manufacturing processes.
2Reliability
If tapered internal and external threads are used in the coupling mechanism, then the frictional engagement and stability are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making only the internal thread conical while keeping the external thread straight. This localized modification concentrates the complexity only where needed (in the tool holder's internal thread) to achieve improved frictional engagement, rather than requiring both threads to be tapered, thereby reducing overall device complexity.
3Reliability
If a conical internal thread with small cone angle is used, then the frictional engagement from forwardmost to rearmost turn is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent selects an optimized cone angle range (α between 5° and 15°) that balances frictional engagement improvement with manufacturability. This parameter optimization ensures sufficient stability enhancement while keeping the cone angle large enough to avoid excessive manufacturing precision requirements that would make production impractical.
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 configuration increases frictional engagement between the external and internal threads, enhancing the stability and retention of the replaceable cutting head within the tool holder, thereby improving the tool's performance and resistance to lateral forces during milling operations.
Implementation Method 1
enhances frictional engagement from the forwardmost to the rearmost turn, improving stability against lateral cutting forces
Data Source
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AI summary
A rotary cutting tool (20) includes a replaceable cutting head (22) and a tool holder (24). The replaceable cutting head (22) includes a forward cutting portion (26) and a rearward mounting portion (28). The mounting portion (28) includes a male coupling member (38) that includes a straight external thread (42). The tool holder (24) includes a female coupling member (68) that includes a conical internal thread (72). When the rotary cutting tool (20) is in a locked position, the external thread (42) is threadingly engaged with the internal thread (72).