Asymmetrical Drilling Tool Guide Lands for Vibration Control
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Solution Overview
Problem
Conventional multi-part drilling tools face challenges in maintaining high machining accuracy and concentric running properties, leading to vibration resonances and reduced drilling quality.
Innovation Solution
A multi-part drilling tool design featuring an interchangeable cutting insert with an asymmetrical main lip, split into a guide lip and a clearance lip, and a support shank with complementary guide and supporting lands, which guide the tool during drilling, enhancing concentric running properties and allowing for adjustable balancing and improved chip disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multi-part drilling tool with symmetrical cutting insert is used, then the tool structure is simple and easy to manufacture, but the concentric running properties deteriorate and vibration resonances occur
Solution Approach 1:
The cutting insert is designed with an asymmetrical configuration where the main lip is split into a guide lip and a clearance lip at different angles relative to the center longitudinal axis. The guide lip forms an first angle while the clearance lip forms a second angle, creating asymmetrical guiding surfaces that improve concentric running properties and eliminate vibration resonances during drilling operations.
2Adaptability or versatility
If the cutting insert carries all cutting and guiding elements, then the modular construction is achieved, but the concentric running properties deteriorate due to lack of extended guidance
Solution Approach 1:
The invention merges the guiding function into both the cutting insert and the support shank. The support shank is provided with guide lands that extend the guiding surfaces of the cutting insert, creating a continuous asymmetrical guiding system. This combination ensures that the drilling tool is guided not only in the region of the cutting insert but also in the region of the support shank, significantly improving concentric running properties while maintaining modular construction.
3Adaptability or versatility
If asymmetrical guiding elements are provided only on the cutting insert, then the modular design is maintained, but the guidance effectiveness is insufficient for high precision drilling
Solution Approach 1:
The guiding function is merged into both the cutting insert and the support shank. The support shank includes guide lands with specific angles that complement and extend the asymmetrical guiding elements of the cutting insert, creating a continuous guidance system that significantly improves drilling accuracy and concentric running properties while maintaining modular design.
Solution Approach 2:
The guidance system is extended from a single-point guidance at the cutting insert to a continuous guidance system that spans both the cutting insert region and the support shank region. This dimensional extension of the guidance function along the axial direction of the drill provides enhanced stability and precision throughout the entire drilling process.
Data Source
AI summary
The invention relates to a drilling tool (1) comprising a support shank (2) and an interchangeable cutting insert (3) which is fitted to the support shank (2) and which has an asymmetrical main lip (15) divided into a guide lip (10) having a supporting land (12) and a guide land (23) trailing the supporting land (12), and into a clearance lip (13) having a trailing clearance portion (14), wherein a guide land (28) and a supporting land (29) are formed on the lateral surface of the support shank (2) and continuously extend the guide land (23) and the supporting land (12), respectively, on the cutting insert (3) and additionally guide the drilling tool (1) on the inner wall of a drill hole during a drilling operation.