Detachable Drill Body With Variable Chip Flutes for Stronger Coupling
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Solution Overview
Problem
Rotatable drilling tools with axially split designs often experience issues with cracks or breakage at the interfaces between the basic body and the detachable head, affecting their durability and service life.
Innovation Solution
The drilling tool is designed with a basic body divided into a coupling segment for stronger attachment and a transportation segment for efficient chip evacuation, featuring chip flutes of varying depths to optimize both coupling strength and chip removal, along with a locking mechanism using male and female parts for secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the basic body and head are detachably connected with a simple coupling structure, then the tool can be disassembled for replacing the wear part, but the coupling strength is insufficient leading to cracks or breakage at the interface
Solution Approach 1:
The basic body is divided into two segments along the longitudinal axis: a coupling segment containing the female part and a transportation segment containing the chip flute. This segmentation allows the coupling structure to be optimized independently for strength while maintaining replaceability of the insert top.
Solution Approach 2:
The chip flute depth is made non-uniform along the longitudinal axis: shallower in the coupling segment to preserve material thickness and coupling strength, and deeper in the transportation segment to ensure effective chip evacuation. This local variation in geometry resolves the contradiction between coupling strength and chip removal efficiency.
2Productivity
If the chip flute is made deeper for better chip evacuation, then chip removal efficiency improves, but the material thickness in the coupling segment decreases leading to weaker coupling and risk of breakage
Solution Approach 1:
The basic body is divided into a coupling segment and a transportation segment. The chip flute is configured with different depths in each segment: shallower in the coupling segment to maintain structural strength, and deeper in the transportation segment to ensure effective chip evacuation.
Solution Approach 2:
The chip flute depth varies locally along the longitudinal axis of the basic body. In the coupling segment, the flute is shallower to preserve material thickness for strong coupling. In the transportation segment, the flute is deeper to optimize chip removal. This local differentiation resolves the contradiction between chip evacuation efficiency and coupling strength.
3Strength
If the male part of the insert top is made larger for stronger coupling, then the coupling strength improves, but the insert top size and complexity increase
Solution Approach 1:
The basic body is segmented into a coupling segment containing the female part and a transportation segment containing the chip flute. This segmentation allows the female part to be optimized for strong coupling without increasing insert top size, as the coupling geometry is determined by the basic body structure rather than the insert top.
Data Source
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AI summary
The present invention relates to a rotatable drilling tool for chip removing machining that comprises a basic body (1) and an insert top (2) that is detachably connectable to the basic body (1). The basic body (1) is divided longitudinally into a coupling segment (10) and into a transportation segment (12) that is longer than the coupling segment (10). At least one chip flute (9) extends through the coupling segment (10) and the transportation segment (12) and has a smaller depth in the coupling segment (10) than in the transportation segment (12).