Shim Upper Edge Geometry for Cutting Insert Chip Protection
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Solution Overview
Problem
Existing cutting tools face issues with chip impact damage on non-active cutting edges due to uncontrolled chip movement, and prior solutions either fail to provide adequate protection or compromise precision and tool positioning.
Innovation Solution
A combination of a shim and indexable cutting insert with closely spaced upper edges and cutting edges, where the shim's upper edges are within 0.5 mm of the cutting edges, and the shim's dimensions are adapted to match the cutting insert's, ensuring that chips impact the shim rather than the cutting edges, thereby protecting the edges and maintaining precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shim's upper edges are positioned at a large clear distance from the cutting edges, then the cutting edges are exposed to chip impact, but positioning precision is easier to achieve
Solution Approach 1:
The patent introduces a shim as an intermediary component between the seat and the cutting insert. The shim's upper edges are positioned close to the cutting edges (at most 0.5 mm distance) to act as a protective barrier that intercepts chips before they can impact the cutting edges, while the shim itself is designed with precise geometric features that maintain positioning accuracy when combined with the cutting insert
Solution Approach 2:
The protective function is segmented from the cutting insert itself and transferred to the separate shim component. This allows the shim to be optimized specifically for protection (with upper edges close to cutting edges) while the cutting insert maintains its positioning features, resolving the contradiction between protection and positioning precision
2Strength
If a soft intermediate layer is used between the shim and cutting insert, then shock loads are absorbed, but the seat position and cutting insert position are not defined with sufficient precision
Solution Approach 1:
The patent changes the material parameter of the shim from soft (as in prior art) to hard material that is not easily deformed. This parameter change allows the shim to maintain precise position definition under load while still providing protection, eliminating the need for soft intermediate layers that compromise positioning precision
Data Source
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AI summary
The present invention relates to a substrate plate (10) for a double-sided indexable cutting insert (20), which is to be fixed within a tool (30) to be equipped with at least one cutting insert, where the tool has at least one seat (31) for at least one indexable cutting insert (20), where the substrate plate (10) has a plate-like fundamental shape with a round or polygonal outline and with a lower contact area (1), generally planar, which can be placed in contact with one area (32) of the seat (31), and with an upper support area (2) bearing the indexable cutting insert (20), where the contact area (1) and support area (2) have connection to one another via side walls (3) defining the periphery of the substrate plate. The invention proposes, in order to provide a substrate plate and appropriate combinations composed of substrate plates and indexable cutting plates, and also to provide appropriate tools which ensure very precise seating of the indexable cutting plate and nevertheless also give better protection of the cutting edges on that side of the cutting insert facing towards the substrate plate, with respect to disadvantageous contact and damage via swarf impact, that the support area (2), has, at a distance from the side areas (3), a plateau (4) arranged parallel to the contact area, and that the upper edges (5) formed on the substrate plate (10) at the transition between the side walls (3) and the support area (2) have a varying distance from the plane of the lower contact area.