Replaceable Cutting Head Coupling for Secure Torque Transfer
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Solution Overview
Problem
Existing rotary cutting tools with replaceable cutting heads face challenges in securely attaching and transferring torque for small outer cutting diameters, particularly in tools with detachable inserts that are time-consuming to replace and prone to misplacement or loss.
Innovation Solution
A coupling mechanism with a male coupling member and female coupling member featuring non-cylindrical, conically shaped abutment surfaces and inter-engaged projections and recesses, along with a fastening screw, ensures secure attachment and effective torque transfer for rotary cutting tools, especially those with small outer cutting diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coupling mechanism with only a fastening screw is used, then the structure is simple, but torque transfer is insufficient and the cutting head may loosen during operation
Solution Approach 1:
The patent combines multiple coupling mechanisms into a unified structure: the fastening screw provides axial clamping force, while the driven projections on the male coupling member engage with driving recesses on the female coupling member to provide torque transfer. This merging of clamping and torque transfer functions into a single integrated coupling mechanism resolves the contradiction by achieving reliable secure attachment without requiring separate complex mechanisms.
Solution Approach 2:
The coupling mechanism uses composite structural elements: the male coupling member includes both a fastening screw portion and driven projections, while the female coupling member includes both a clamped portion and driving recesses. This composite design allows the single coupling mechanism to simultaneously provide both clamping force and torque transfer, resolving the contradiction between simplicity and reliability.
2Adaptability or versatility
If detachable cutting inserts are used, then the cutting head can be replaced, but the replacement process is time-consuming and inserts may be misplaced or lost
Solution Approach 1:
The coupling mechanism is designed to be self-retaining through the engagement of driven projections with driving recesses, which automatically maintain the cutting head in position during operation. The fastening screw provides continuous clamping force, eliminating the need for additional retention steps during replacement, thus reducing replacement time and preventing misplacement or loss of cutting inserts.
3Power
If a coupling mechanism with inter-engaged projections and recesses is added, then torque transfer is improved, but the device complexity increases
Solution Approach 1:
The coupling mechanism is segmented into distinct functional elements: the fastening screw handles axial clamping, while the driven projections and driving recesses handle torque transfer. This segmentation allows each element to be optimized for its specific function while maintaining overall simplicity. The driven projections are integrated into the male coupling member structure, and the driving recesses are formed in the female coupling member, avoiding the need for separate complex components.
Data Source
AI summary
A cutting tool includes a cutting head including a rearward mounting portion and a head through hole. The mounting portion includes a male coupling member having a non-cylindrical, conically shaped head abutment surface, and at least two driven projections. The cutting tool includes a tool holder having a holder pocket which includes a female coupling member having a non-cylindrical, conically shaped forward holder abutment surface, at least two driving recesses and an internal threaded hole. In a locked position, the male coupling member is removably retained in the female coupling member by a fastening screw located in the head through hole and threadingly engaged with the holder internal threaded hole. The head abutment surface abuts the forward holder abutment surface thereby forming a secure coupling between the male and female coupling members. The driven projections are located in the driving recesses for providing torque transfer between the two parts.