Dovetail Cutting Head Fastening for Stable Rotary Tool Retention
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Solution Overview
Problem
Existing rotary cutting tools face challenges in securely and efficiently retaining the cutting head within the tool holder, particularly in maintaining a stable attachment during rotational operations.
Innovation Solution
The rotary cutting tool design incorporates a cutting head with radially extending cutting arms and a tool holder featuring driving members with arm receiving receptacles, utilizing a fastening mechanism with recesses and abutment surfaces to securely attach the cutting head, allowing for adjustable positions between released and fastened states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clamping screws are used to retain the cutting head in the tool holder, then the cutting head can be securely attached, but the attachment stability during rotational operations is insufficient
Solution Approach 1:
The cutting head is divided into multiple cutting arms that can be independently retained by individual driving members. Each cutting arm can be separately attached and secured, allowing for precise positioning and stable retention during rotation. The segmentation enables each arm to be independently optimized for its function while contributing to the overall stability of the cutting head assembly.
Solution Approach 2:
The cutting arms are nested within arm receiving receptacles formed by the driving members. The cutting arms fit into these receptacles, creating a nested configuration where the cutting head components are housed within the tool holder structure. This nesting provides secure retention and stable attachment during rotational operations.
2Reliability
If the cutting head is made rigid for stability, then attachment stability improves, but chip evacuation becomes difficult
Solution Approach 1:
The cutting head is segmented into multiple cutting arms with spaces between them. This segmentation creates channels and pathways through which chips can be evacuated during cutting operations. The segmented structure maintains the rigidity needed for stable attachment while providing open pathways for chip removal, resolving the contradiction between stability and productivity.
3Ease of manufacture
If the cutting head design is simplified for ease of manufacture, then manufacturing cost decreases, but the fastening mechanism reliability is reduced
Solution Approach 1:
The fastening mechanism uses a nested configuration where cutting arms are retained within arm receiving receptacles formed by driving members. This nested design provides reliable fastening through the interlocking geometry of the receptacles and cutting arms, while the modular nature of the components allows for straightforward manufacturing processes. The reliability is enhanced by the precise fit within the nested structure.
Solution Approach 2:
The arm receiving receptacles are pre-formed in the driving members during manufacturing. This preliminary action ensures that the fastening mechanism is built-in from the start, providing reliable retention without requiring complex additional fastening components. The pre-formed receptacles simplify the overall manufacturing process while maintaining high fastening reliability.
Data Source
AI summary
A cutting head has two radially extending cutting arms and at least one fastening recess having an opening located at least partially on one of cutting arms. Each cutting arm has a dovetail arm rear abutment surface. A tool holder has a two circumferentially spaced apart driving members. The tool holder has a pocket with two radially extending arm receiving receptacle. Each receptacle has a dovetail receptacle rear abutment surface. The tool holder has at least one through hole located in one of the driving members. When assembled, a fastening member is disposed in the through bore and engages with the fastening recess to urge each cutting arms towards a respective driving member.