Asymmetric Cutting Insert Prevents Ring Jamming in Plate Stacks
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Solution Overview
Problem
Conventional drilling tools with trigon cutting inserts face difficulties when drilling unconnected stacks of plates, as the design leads to the creation of freely movable ring structures that can jam the tool, making further drilling impossible and potentially damaging the tool.
Innovation Solution
A polygonal cutting insert with an asymmetrically tilted main lip is designed to fit into conventional trigon cutting insert receptacles, preventing the formation of freely movable ring structures by ensuring the drill hole depth does not increase radially outward, and allowing the tool to be used for both unconnected stacks and solid workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional trigon cutting insert is used with symmetric main lips, then the cutting forces are balanced for drilling solid workpieces, but freely movable ring structures are created when drilling unconnected stacks of plates, causing tool jamming and potential damage
Solution Approach 1:
The patent applies asymmetry by designing the main lip such that its internally cutting end is positioned at a greater distance from the insert axis than its externally cutting end. This asymmetric configuration prevents the formation of freely movable annular material rings when drilling unconnected stacks of plates, while still maintaining effective cutting action. The asymmetric main lip geometry fundamentally changes the chip removal pattern to eliminate the harmful ring structure formation.
Solution Approach 2:
The patent applies local quality by differentiating the main lip geometry into distinct regions: the internally cutting end is positioned asymmetrically at a greater radial distance, while the externally cutting end is at a smaller radial distance. This localized geometric differentiation allows the cutting insert to adapt its cutting action to different drilling conditions (solid workpieces vs. unconnected stacks), optimizing performance for each application without requiring completely different insert designs.
2Object-affected harmful factors
If the cutting insert design is optimized for drilling unconnected stacks of plates, then tool jamming is prevented, but the balanced distribution of cutting forces for drilling solid workpieces is compromised
Solution Approach 1:
The patent achieves universality by designing a single main lip configuration that functions effectively for both drilling unconnected stacks of plates and drilling solid workpieces. The asymmetric main lip geometry prevents tool jamming in stack drilling while maintaining sufficient cutting force balance for solid workpiece drilling. This multi-functional design eliminates the need for separate specialized inserts for different drilling applications, allowing one insert type to handle multiple drilling scenarios.
3Reliability
If a specialized drilling tool is created to prevent tool jamming on unconnected stacks of plates, then drilling reliability is improved, but device complexity and investment cost increase
Solution Approach 1:
The patent applies dynamics by making the cutting insert design adaptable to different drilling applications through its asymmetric main lip geometry. Rather than creating a completely specialized tool with fixed geometry, the dynamic design allows the same insert configuration to adjust its cutting action based on the workpiece type, enabling one tool design to serve multiple functions effectively.
Solution Approach 2:
The patent applies parameter changes by modifying the main lip geometry parameters (specifically the radial positions of the internally and externally cutting ends) to achieve the desired cutting behavior. By adjusting these geometric parameters, the insert prevents tool jamming while maintaining compatibility with conventional trigon cutting insert receptacles, avoiding the need for completely new tooling infrastructure.
Data Source
AI summary
A cutting insert for use in a drilling tool includes two end faces disposed perpendicular to an insert axis and a plurality of side walls connecting the end faces. Supporting surfaces for bearing against corresponding mating supporting surfaces of a cutting insert receptacle of the drilling tool are formed on at least two of the side walls arranged in a rear region of the cutting insert. A main lip for machining a workpiece to be drilled is formed on at least one side wall arranged in a front region of the cutting insert. The side walls having the supporting surfaces are arranged in such a way that the cutting insert can be inserted into a trigon cutting insert receptacle in an accurately fitting manner.