Rotary Cutting Tool Coupling Pin Guiding and Fastening Recesses
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Solution Overview
Problem
Existing rotary cutting tools face challenges in securely and reliably attaching the cutting head to the tool holder, often requiring multiple fastening members or complex locking mechanisms, which can be cumbersome and prone to misalignment.
Innovation Solution
A rotary cutting tool design featuring an elastic fastening assembly with a head coupling pin and guiding recess, allowing the cutting head to be adjustable between a guided, fastened, and locked position, utilizing a single fastening member for secure attachment without additional screws, ensuring robust coupling and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fastening members or complex locking mechanisms are used to securely attach the cutting head to the tool holder, then the reliability of attachment is improved, but the device complexity increases
Solution Approach 1:
The patent combines the guiding function and fastening function into a single integrated coupling pin structure. The coupling pin includes both a guiding portion for alignment and a fastening portion with recesses for securing, eliminating the need for separate fastening members or complex locking mechanisms while maintaining secure attachment reliability.
Solution Approach 2:
The coupling pin serves multiple functions simultaneously: it provides guiding for alignment during assembly, acts as a fastening element through its recesses that engage with protrusions, and enables secure attachment of the cutting head to the tool holder. This multi-functional design reduces device complexity while maintaining reliability.
2Reliability
If multiple fastening members are used to securely attach the cutting head, then the attachment reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
By merging the guiding and fastening functions into a single coupling pin, the assembly process is simplified to one straightforward operation. The guiding portion automatically aligns the cutting head with the tool holder, and the fastening portion secures it in place, eliminating the need for multiple separate fastening operations.
Solution Approach 2:
The guiding portion of the coupling pin performs preliminary alignment action during assembly, automatically positioning the cutting head correctly before the fastening portion engages. This preliminary guiding action ensures proper alignment is achieved as part of the single assembly operation, improving ease of operation while maintaining reliability.
3Ease of operation
If a single fastening member is used to attach the cutting head, then the ease of operation is improved, but the reliability of attachment deteriorates
Solution Approach 1:
The single coupling pin is segmented into distinct functional portions: a guiding portion with guiding surfaces for alignment, and a fastening portion with recesses for securing. This segmentation allows one component to perform multiple functions reliably, maintaining attachment security while simplifying assembly to a single operation.
Solution Approach 2:
Different portions of the coupling pin have different local qualities optimized for their specific functions. The guiding portion has smooth guiding surfaces for precise alignment, while the fastening portion has recesses engineered for secure engagement with protrusions on the tool holder. This localized optimization ensures both ease of operation and reliable attachment with a single component.
4Reliability
If complex locking mechanisms are used to secure the cutting head, then the attachment reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The guiding portion of the coupling pin performs preliminary alignment action during the assembly process itself, automatically positioning the cutting head correctly as it is being attached. This eliminates the need for pre-alignment or specialized tooling, reducing manufacturing precision requirements while ensuring reliable attachment through the integrated guiding and fastening mechanism.
Solution Approach 2:
The coupling pin's guiding portion enables the assembly process to be self-aligning. As the cutting head is brought toward the tool holder, the guiding surfaces automatically guide it into the correct position, making the assembly process self-correcting and reducing dependence on high manufacturing precision for alignment.
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 provides a secure, adjustable, and easy-to-assemble attachment mechanism, reducing the risk of misalignment and axial pullout, while maintaining a robust coupling that allows for effective torque transfer and efficient cutting operations.
Implementation Method 1
an elastic fastening assembly releasably engaged to the tool holder at the holder through bore, and having a protruding portion protruding into the holder coupling hole
Data Source
AI summary
A cutting head has driven surfaces and includes a head coupling pin that protrudes rearwardly from a head rear surface. The head coupling pin includes guiding and fastening recesses recessed in the pin peripheral surface, the guiding recess opening out to the pin rear surface. A tool holder assembly has a tool holder and an elastic fastening assembly. The tool holder has driving members and a holder coupling hole recessed in a holder base surface. The elastic fastening assembly is disposed in a holder through bore that extends from the holder base surface to a holder peripheral surface. When a cutting tool which includes the cutting head and tool holder is in a fastened position, the head coupling pin is removably retained within the holder coupling hole upon elastic engagement with the elastic fastening assembly.