Indexable Cutting Insert Protruding Side Abutment
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Solution Overview
Problem
Conventional indexable cutting inserts lack an efficient abutment arrangement that maintains orientation consistency and enhances structural toughness, leading to suboptimal securement and potential breakage during machining operations.
Innovation Solution
The design of an indexable double-negative cutting insert with elongated protrusions and specific side abutment surfaces that form obtuse angles, allowing for improved securement within a tool body pocket without requiring additional clamping mechanisms, while maintaining the same orientation as conventional N-type inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cutting inserts use flat side surfaces as abutment surfaces, then the structure is simple, but the securement and structural toughness are insufficient
Solution Approach 1:
The cutting insert is divided into multiple functional zones including protrusions with side abutment surfaces, corner peripheral sections, and peripheral side sections. This segmentation allows each zone to perform specific functions - the protrusions provide enhanced abutment for securement while corner sections maintain cutting functionality, thereby improving structural toughness without excessive complexity
Solution Approach 2:
Different regions of the cutting insert are given different geometric properties tailored to their specific functions. The protrusions have side abutment surfaces with specific angles for securement, while corner peripheral sections have different geometries for cutting. This local differentiation optimizes structural toughness where needed without complicating the entire insert structure
2Reliability
If protrusions are added to improve abutment arrangement, then securement is enhanced, but chip flow may be obstructed
Solution Approach 1:
The protrusions are strategically positioned and dimensioned to provide local abutment enhancement only where needed for securement, while the corner peripheral sections and other regions maintain geometries that allow free chip flow. This localized approach ensures reliability without creating harmful obstructions
Solution Approach 2:
Instead of making the entire insert body bulky for securement, the invention uses protrusions that extend outwardly to provide abutment surfaces, effectively inverting the approach by adding securement features without increasing overall insert volume, thus avoiding chip flow obstruction
3Reliability
If side abutment surfaces form specific angles, then abutment effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The side abutment surfaces are designed with specific angle parameters (e.g., angles between 45-90 degrees relative to the end surface) that optimize abutment effectiveness. By establishing these as defined parameters in the design, the invention balances abutment effectiveness with manufacturability, as these angles can be achieved with standard manufacturing tolerances
Data Source
Figure 1~2
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Figure 8~10
AI summary
An indexable double-negative cutting insert (14) includes an index axis (A), two opposing end surfaces (36), a peripheral side surface (38) which extends therebetween, and opposing side cutting edges (46) formed between the end surfaces (36) and the peripheral side surface (38). A median plane (P) is located midway between the end surfaces (36), passes through the peripheral side surface (38) and is perpendicular to the index axis (A). The peripheral side surface (38) includes at least one protrusion (54) which extends in an outward direction relative to the index axis (A), in a plan view of either end surface (36). The protrusion (54) includes two side abutment surfaces (60) which converge in the outward direction towards the median plane (P). In each cross-section perpendicular to the median plane (P), which cross-section passes through both opposing side cutting edges (46) and also the at least one protrusion (54), no portion of the peripheral surface (38) is inward of an imaginary line (LI) connecting the opposing side cutting edges (46).