Rotating Tool Segmented Guide Chamfers Friction Heat
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Solution Overview
Problem
Existing chip-removing rotating machining tools face challenges in maintaining alignment accuracy and reducing friction and heat generation during drilling operations, as multiple guide chamfers increase guidance but also enhance friction and tool heating.
Innovation Solution
A tool design with at least one main cutting edge and one secondary cutting edge, featuring a flute in the cutting direction, where only one guide chamfer is present initially to reduce friction, and a second guide chamfer engages later for improved guidance and rigidity, with a gap in the guide chamfer allowing reduced friction and less heating, and optionally wider or narrower guide chamfers along the tool axis for enhanced support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple guide chamfers are provided along the longitudinal axis to improve guidance and alignment accuracy, then alignment accuracy is improved, but friction and heat generation increase
Solution Approach 1:
The guide chamfers are segmented into discrete sections along the longitudinal axis, with gaps between them. Instead of providing continuous guidance along the entire length, the invention divides the guidance function into separate segments that engage at different positions, reducing continuous friction while maintaining alignment accuracy when needed.
Solution Approach 2:
The guide chamfers are arranged to engage periodically along the longitudinal axis rather than continuously. The gaps between guide chamfer sections create a periodic engagement pattern where guidance is provided at specific intervals, reducing overall friction and heat generation while maintaining alignment accuracy during critical machining phases.
2Manufacturing precision
If guide chamfers are extended to engage earlier in the cutting direction, then guidance is improved, but friction increases and heating occurs in the front area
Solution Approach 1:
The first guide chamfer is positioned to engage before the secondary cutting edge begins cutting, providing preliminary guidance and alignment. This allows the tool to be properly positioned and aligned before the actual cutting action commences, improving guidance without requiring continuous engagement that would generate excessive heat during the cutting process.
Solution Approach 2:
The invention extracts the guidance function from the continuous guide chamfer structure and separates it into discrete sections. By taking out the guidance function only where and when needed (at the front area for alignment, and later for rigidity), the design eliminates unnecessary guide chamfer contact that would generate friction and heat in the front cutting area.
3Manufacturing precision
If continuous guide chamfers are provided from the transition area along the longitudinal axis, then guidance is maintained, but friction and heat generation are increased throughout the tool length
Solution Approach 1:
The continuous guide chamfer structure is segmented into discrete sections with gaps between them. This segmentation allows the tool to maintain guidance only when necessary, reducing friction energy loss by eliminating continuous contact between the guide chamfers and the workpiece throughout the entire longitudinal axis.
Solution Approach 2:
Instead of providing full continuous guidance along the entire length of the tool, the invention uses partial guidance action through spaced guide chamfer sections. This partial action is sufficient to maintain alignment accuracy and tool rigidity while significantly reducing the friction energy loss that would occur with continuous engagement.
Data Source
Figure 1
AI summary
The invention relates to a tool (1) for rotary machining (1), having a base body on which at least one main cutter (3) is provided in a frontal area and at least one secondary cutter (6) is provided along a longitudinal axis at an outer circumference of the base body, a chip flute (7) being disposed ahead thereof in the cutting direction, and wherein at least two guide faces (8, 10) follow behind the secondary cutter (6) in a counter-cutting direction, back to a further chip flute (7). According to the invention, at least one guide face (10) of the at least two guide faces (8, 10) is not continuous in design from a transition area of the frontal are to a circumferential area along the longitudinal axis, as seen from the frontal area of the tool, but instead a free area without any guide face is present between the transition area and a further extension.