Asymmetrical Cutting Insert with Recesses for Milling Tool Positioning
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Solution Overview
Problem
Conventional indexable cutting inserts for end mills face challenges in precise positioning and rigid clamping due to their oval shape and symmetrical design, making it difficult to maintain machining precision under fluctuating cutting forces.
Innovation Solution
An asymmetrical indexable cutting insert with two cutting edge portions, each comprising a substantially straight edge and a curved edge of different lengths, is designed to fit into a cutting insert pocket with cooperating projections and recesses, allowing for precise alignment and rigid clamping using a screw mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional symmetrical indexable cutting insert is used, then the insert can be easily manufactured and installed, but precise positioning and rigid clamping become difficult under fluctuating cutting forces
Solution Approach 1:
The cutting insert employs an asymmetrical geometry with two differently shaped cutting edges - one with a curved profile and the other with a straight profile. This asymmetry creates unique positioning features that enable precise alignment with the holder, eliminating the positioning difficulties associated with symmetrical oval-shaped inserts while maintaining manufacturability
2Strength
If the cutting insert has an oval shape with symmetrical design, then the structure is simple, but rigid clamping cannot be achieved under heavy cutting forces
Solution Approach 1:
The asymmetrical design of the cutting insert creates non-uniform contact surfaces and positioning features that work in conjunction with the clamping mechanism. The differently shaped cutting edges generate specific force distribution patterns that enhance clamping rigidity under heavy cutting forces, allowing the clamping mechanism to maintain secure holding without excessive complexity
Solution Approach 2:
The cutting insert features locally optimized geometries at critical positions - the curved cutting edge provides one type of contact characteristic while the straight cutting edge provides another. This local differentiation of geometric properties enables the insert to achieve rigid clamping through distributed force paths rather than requiring a uniformly complex structure throughout
3Adaptability or versatility
If indexable cutting inserts are used for precise contour machining, then tool flexibility is improved, but positioning precision deteriorates under severe machining conditions
Solution Approach 1:
The asymmetrical cutting insert design incorporates unique positioning features created by the differently shaped cutting edges. These features ensure repeatable, precise positioning when the insert is mounted in the holder, maintaining positioning accuracy even under the severe and fluctuating cutting forces encountered during contour machining operations
Solution Approach 2:
The cutting insert geometry is designed with pre-formed positioning features and alignment elements that are built into the insert structure itself. These preliminary positioning features ensure accurate placement in the holder before cutting forces are applied, preventing positioning drift during severe machining conditions while preserving the adaptability of indexable insert systems
Data Source
AI summary
The present invention relates to an indexable cutting insert for an end mill for machining of contours in a workpiece and to a milling tool. The cutting insert is asymmetrical in respect of a line through a hole in the cutting insert. The cutting insert includes two cutting edge portions. Each cutting edge portion comprises of a substantially straight cutting edge and a curved cutting edge along respective intersecting lines between a clearance surface and a chip surface. The curved cutting edges have different lengths. The cutting insert includes recesses in a bottom side of the cutting insert. The recesses are arranged on both sides of and at different distances from the hole of the cutting insert.