Reversible Shell Mill Disc for Faster Insert Indexing
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Solution Overview
Problem
Existing shell mills require significant downtime for removing and indexing cutting inserts, reducing production efficiency due to the need for complete removal from the machine and repositioning of inserts.
Innovation Solution
A cutter disc with identical cutting surfaces on both sides allows for quick flipping and reorientation without removing the shell mill from the machine, combined with a double action fastener and top plate to secure the disc, enabling easy replacement and reinstallation of worn inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional shell mill adapters with internal threaded openings are used, then the cutter can be securely attached to the arbor, but significant time is spent removing and repositioning cutting inserts, reducing production efficiency
Solution Approach 1:
The cutting tool is divided into separate functional components: a reusable adapter body (400) and replaceable cutter discs (200). Each cutter disc can be independently removed and replaced without affecting the adapter or other cutter discs, enabling rapid insertion replacement while maintaining secure attachment of the entire cutter assembly to the arbor.
Solution Approach 2:
Worn cutting inserts on the cutter disc are discarded and replaced with fresh inserts or new cutter discs. The adapter body and other components are recovered and reused, minimizing waste and reducing the time required for insert replacement operations.
2Manufacturing precision
If cutting inserts are replaced and accurately positioned, then the tool maintains cutting precision, but the process requires complete removal from the machine and significant operational time
Solution Approach 1:
The adapter body is pre-configured with indexed recesses (404) that correspond to keyed protrusions (204) on the cutter discs. This preliminary indexing system ensures that when cutter discs are installed, they automatically align to precise angular positions without requiring manual measurement or adjustment, maintaining cutting precision while reducing installation time.
Solution Approach 2:
The manual process of removing, measuring, and repositioning cutting inserts is replaced by a mechanical indexing system using keyed protrusions and indexed recesses. This mechanical feature automatically positions cutter discs at precise angles, eliminating the need for time-consuming manual alignment while ensuring accurate cutting insert positioning.
3Ease of manufacture
If modular shell mill design is used, then ease of manufacturing and component replacement is achieved, but the adapter and cutter assembly require complete disassembly for insert indexing
Solution Approach 1:
Multiple functional features are merged into the adapter body design: the keyed recesses (404) for angular positioning, the threaded opening (410) for arbor attachment, and the support surfaces (402) for cutter disc mounting. This integration allows cutter discs to be quickly installed with proper positioning and secure attachment in a single operation, eliminating the need for separate disassembly and indexing steps.
Solution Approach 2:
The adapter body's indexed recesses and keyed protrusions create a self-aligning system where the cutter disc automatically positions itself at the correct angle during installation. The mechanical features guide the cutter disc into proper alignment without requiring external tools or manual adjustment, simplifying the replacement process while maintaining precision.
Data Source
AI summary
A cutting tool includes a cutter disc, a cutter base adapted to be attached to an arbor, a fastener, and a plate. The cutter disc includes at least one cutting surface on each of a top and a bottom side thereof. The fastener extends through the cutter base and removably secures the cutter disc to the cutter base in each of a first position and a second position exposing a respective one of the top and bottom sides of the cutter disc for use. The plate is mounted to the cutter base between the cutter disc and the cutter base, and fixes a position of the fastener.