Shim Plate Chamfer Strengthens Auxiliary Cutting Edge
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Solution Overview
Problem
Previous shim plates for milling cutters with indexable milling inserts at medium-sized axial tipping-in angles provide mediocre bottom support and are not resistant to abrupt stresses during insert breakdowns, leading to potential damage to the tool and machine.
Innovation Solution
A shim plate design with a chamfer surface forming an obtuse angle between the upperside and radially outer side surface, enhancing the strength and robustness of the auxiliary cutting edge while maintaining a larger supporting underside, preventing deformation and ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shim plate has a traditional design with a straight edge transition from upperside to side surface, then the structure is simple and easy to manufacture, but the auxiliary cutting edge is not resistant to abrupt stresses during insert breakdowns
Solution Approach 1:
The shim plate incorporates a chamfer surface at the radially outer edge portion, creating a localized structural feature with obtuse angle geometry. This local quality enhancement specifically strengthens the auxiliary cutting edge region to resist abrupt stresses during insert breakdowns, while the rest of the shim plate maintains its traditional simple structure for ease of manufacture.
2Manufacturing precision
If the shim plate has a larger supporting underside area, then the bottom support is improved and positioning is more precise, but the auxiliary cutting edge strength is reduced
Solution Approach 1:
The chamfer surface creates a localized geometric feature at the edge portion where the upperside transforms into the side surface. This local structural modification provides strength concentration at the auxiliary cutting edge through the obtuse angle geometry, while the overall larger supporting underside area maintains precise positioning and bottom support functionality.
Data Source
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AI summary
This invention relates to a shim plate for milling tools for chip removing machining of the type that comprises an upperside (26), an underside, and at least one side surface (36a) extending between the same and forming an angle of maximum 90°with the upperside (26), wherein a through hole (23) includes a first section (24) mouthing in the upperside (26), and a second section (25) mouthing in the underside and having a diameter a diameter that is smaller than the diameter of the first section, besides which the upperside (26) transforms into the side surface (36a) via an edge portion intended to, when need arises, serve as an auxiliary chip-removing cutting edge. According to the invention, said edge portion is strengthened by including a chamfer surface (39) that forms an obtuse angle with the upperside (26). In addition, the invention relates to a milling tool of the type that makes use of shim plates according to the invention.