Non-Positive Ramping Insert Geometry for 90-Degree Shoulder Milling
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Solution Overview
Problem
Existing milling inserts lack ramping capabilities and efficient production methods, with pressing methods often requiring multiple axes and increasing production costs due to complex die designs and potential for surface inaccuracies.
Innovation Solution
A double-sided, indexable, non-positive ramping insert with a 180-degree rotational symmetry and specific geometric features, including major and ramping edges, wiper edges, and non-ground relief surfaces, allowing for efficient milling of 90-degree shoulders and ramping operations while maintaining simplicity in die design and production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pressing methods are used for milling inserts, then production simplicity is maintained, but ramping capabilities and machining precision are lacking
Solution Approach 1:
The pressing method transitions from single-axis to multi-axis pressing, adding dimensional complexity to the die design. This enables the formation of ramping edges with specific geometries (alpha and beta angles) that cannot be achieved with traditional single-axis pressing, thereby providing ramping capabilities while maintaining production efficiency
Solution Approach 2:
The insert geometry incorporates asymmetric ramping edges with different angles (alpha and beta) on opposite sides, allowing the insert to function for both left-hand and right-hand ramping operations. This asymmetric design enables precise machining of 90-degree shoulders while keeping the die design relatively simple through the use of standard pressing techniques adapted for asymmetric geometries
2Adaptability or versatility
If multiple-axis pressing methods are used, then ramping capabilities are achieved, but production costs and die complexity increase
Solution Approach 1:
The insert design incorporates multiple functional edges (major cutting edge, corner cutting edge, ramping edge, and wiper edge) that enable a single insert to perform multiple operations including ramping, shoulder milling, and wiping. This multi-functionality increases adaptability while maintaining cost-effectiveness by reducing the need for multiple specialized tools
Solution Approach 2:
The insert geometry is segmented into distinct functional zones with specific edges for different operations. The ramping edge is separated from the major cutting edge and wiper edge, allowing each segment to be optimized for its specific function. This segmentation enables versatile ramping operations while maintaining manufacturing simplicity through modular die design
3Manufacturing precision
If ground surfaces are used for precision, then machining accuracy is improved, but production time and cost increase
Solution Approach 1:
The pressing process is designed to pre-form the insert geometry with accurate dimensions and surface finishes directly during the pressing operation, eliminating the need for subsequent grinding. The multi-axis pressing capability ensures that ramping edges and other critical surfaces are formed with the required precision in the initial pressing stage, thereby maintaining high productivity
Solution Approach 2:
The mechanical grinding process is replaced with a precisely controlled pressing process that uses calibrated dies and multi-axis movement to achieve the required surface accuracy. This substitution eliminates the time-consuming grinding operation while maintaining or improving surface quality through the precision of the pressing mechanism
4Ease of manufacture
If single-axis pressing is used, then production cost is reduced, but ramping geometry and precision are compromised
Solution Approach 1:
The pressing system incorporates multi-axis movement capabilities that allow the die and punch to move along multiple axes simultaneously. This enables the formation of complex ramping edge geometries with precise alpha and beta angles, achieving high manufacturing precision while maintaining production simplicity through the integration of these movements into a single pressing operation
Data Source
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AI summary
A double-sided, indexable, non-positive ramping insert (14) has a 180-degree rotational symmetry about each of the first, second and third axes (X, Y, Z) of a three-dimensional Euclidean space. The ramping insert (14) includes two first surfaces (24) and an insert peripheral surface (26) which extends therebetween. The ramping insert (14) includes four cutting portions (36), each includes a major cutting edge (16), a wiper edge (20) connected transversely thereto via a corner cutting edge (18) and a ramping edge (22) which extends transversely from the wiper edge (20) in a view parallel to the first axis (X). Each peripheral surface (26) includes four non-positive ramping relief surfaces (46), each of which extends from a respective ramping edge (22) towards, and not beyond, a first median plane (XP) which is defined by the second and third axes (Y, Z).