Cutting Insert Interface Radial Force Anchorage
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Solution Overview
Problem
Existing cutting tools with modern interfaces between the cutting insert and basic body often fail to provide robust anchorage under severe cutting conditions, particularly in milling where radial forces dominate, leading to potential dislodgment and deformation of the cutting insert.
Innovation Solution
The design features a primary connecting surface with a V-shaped diverging seat and a saddle-like part in the basic body, combined with a secondary connecting surface on the cutting insert featuring knobs and contact flanks, which allows for robust radial support and secure anchorage using a screw with elastic deformation, minimizing the risk of dislodgment and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If modern interfaces with cross serration surfaces and increased flank angles (60° to 90°+) are used, then the positioning of cutting edges is improved and minor form defects are accommodated, but the anchorage becomes insufficient under severe radial cutting forces
Solution Approach 1:
The connecting surface is divided into multiple functional zones: primary connecting surface with serration pattern for positioning, secondary connecting surface for additional support, and elevated support flank for radial force resistance. This segmentation allows each zone to specialize in specific functions rather than requiring a single surface to handle all demands.
Solution Approach 2:
The invention transitions from a two-dimensional flat connecting surface to a three-dimensional structure with elevated support flanks and multi-level surfaces. The elevated support flank rises above the primary connecting surface plane, creating a stepped configuration that provides radial support in a new spatial dimension, effectively counteracting dominant radial cutting forces.
2Device complexity
If traditional plane contact surfaces with simple serration are used, then the structure is simple, but the anchorage is insufficient under severe cutting conditions particularly in milling where radial forces dominate
Solution Approach 1:
The connecting surface is divided into multiple functional zones: primary connecting surface with serration pattern for positioning, secondary connecting surface for additional support, and elevated support flank for radial force resistance. This segmentation allows each zone to specialize in specific functions rather than requiring a single surface to handle all demands.
Solution Approach 2:
The invention transitions from a two-dimensional flat connecting surface to a three-dimensional structure with elevated support flanks and multi-level surfaces. The elevated support flank rises above the primary connecting surface plane, creating a stepped configuration that provides radial support in a new spatial dimension, effectively counteracting dominant radial cutting forces.
3Ease of manufacture
If cutting inserts are manufactured with direct pressing without grinding, then manufacturing costs are reduced, but dimensional variation increases to ±0.5%
Solution Approach 1:
The invention changes the geometric parameters of the connecting surfaces, specifically the flank angles of the serration pattern (increased from 60° to 90° or more) and the elevation of the support flank. These parameter changes create a more tolerant interface that can accommodate the ±0.5% dimensional variation inherent in direct-pressed inserts while maintaining secure anchorage.
Solution Approach 2:
The connecting surfaces feature asymmetric serration patterns with specific flank angles optimized for both positioning and force resistance. The asymmetric geometry of the elevated support flank relative to the primary connecting surface creates a mechanically advantageous configuration that compensates for dimensional variations in the insert.
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
This configuration ensures stable anchorage of the cutting insert under high radial forces while allowing for cost-effective direct pressing manufacturing and accommodating minor form defects, enhancing tool reliability and precision without the need for extensive grinding.
Implementation Method 1
a screw (17) for clamping the cutting insert (2), characterised in that the clamping force is acting essentially in axial direction
Data Source
AI summary
The invention relates to a basic body (1) and an indexable cutting insert (2) for tools intended for chip removing machining, wherein the cutting insert (2) can be connected to the basic body (1) via an interface comprising a primary connecting surface (7) in the basic body and a secondary connecting surface (11) in the cutting insert. Among two co-operating support flanks (24, 25) included in the connecting surface of the basic body, one (25) is situated on a level above the other (24) in order to form a lateral support for the cutting insert. In the connecting surface (11) of the cutting insert, contact flanks (31, 32) are included that, together with the clearance surface (12) of the cutting insert, form a V-shapedly converging wedge part (50) that can be applied in a seat (15) delimited by the support flanks (24, 25), the contact flank being urged against the low-positioned support flank (24) of the basic body, while an upper part of the clearance surface (12) of the cutting insert is urged against the high-positioned support flank (25). By means of the high-positioned support flank (25), large cutting forces can be carried in a dominant line of action, the interface in other respects efficiently counteracting such tendencies to dislodging/turning of the cutting insert that are caused by more moderate forces in other lines of action.