Drilling Reaming Tool Flute Merging for Chip Transport
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Solution Overview
Problem
Existing rotary cutting tools face challenges in effectively transporting away chips during drilling/reaming operations, particularly as the depth of the hole increases, leading to potential chip jamming and damage to the hole wall.
Innovation Solution
The design incorporates reamer flutes that merge into main flutes, allowing reaming chips to be guided away over a shorter axial length, with reaming cutting edges adjacent to major cutting edges and both flutes having the same helix orientation to prevent chip backup, and includes features like unequal pitch and coolant channels for efficient chip removal and surface quality maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reamer flutes are formed over the entire length of the cutting part like main flutes, then chip transport capacity is improved, but the structure becomes more complex and material consumption increases
Solution Approach 1:
The flute structure is segmented into two distinct types: main flutes that extend over the entire cutting part length, and reamer flutes that are limited to a specific axial region. This segmentation allows each flute type to be optimized for its specific function without unnecessary complexity
Solution Approach 2:
Reamer flutes are provided only in the region where reaming cutting edges are located, rather than extending along the entire cutting part. This local provision of flutes matches the actual chip generation zone, improving chip transport where needed while reducing overall structural complexity
2Productivity
If reamer flutes extend over the entire cutting part length, then chip transport is improved, but manufacturing complexity and material usage increase
Solution Approach 1:
The flute system is divided into main flutes spanning the full length and reamer flutes confined to the reaming region, simplifying the manufacturing process by reducing the extent of flute formation operations
Solution Approach 2:
Reamer flutes are localized to the axial region where reaming cutting edges operate, reducing material removal during manufacturing and simplifying the overall tool fabrication process
3Productivity
If reaming chips are transported over long axial distances, then chip removal is achieved, but chip backup and jamming between hole wall and tool occur
Solution Approach 1:
Reamer flutes are merged into main flutes at their open ends, creating a continuous chip transport path that combines the localized reaming chip collection with the extended main flute transport capacity, preventing chip backup
Solution Approach 2:
The main flutes act as intermediary channels that receive reaming chips from the reamer flutes and transport them further away from the hole, facilitating efficient chip removal without direct long-distance transport in the smaller reamer flutes
4Manufacturing precision
If reaming cutting edges are spaced far from major cutting edges, then finishing operation is improved, but chip transport becomes more difficult
Solution Approach 1:
The reamer flutes are merged into the main flutes, creating a unified chip transport system that handles both drilling chips from major cutting edges and reaming chips from reaming cutting edges efficiently
Solution Approach 2:
The main flutes serve as intermediary transport channels that receive reaming chips from the reamer flutes and convey them away from the hole, solving the chip transport difficulty associated with spaced reaming cutting edges
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents chip jamming, maintains high surface quality, and reduces the risk of tool oscillation and chatter marks by ensuring efficient chip transport and uniform loading of reaming cutting edges, even in deep holes.
Implementation Method 1
main flutes which are wound at a first helix angle... reamer flutes which are wound at a second helix angle
Data Source
AI summary
A drilling/reaming tool includes a basic body which extends in a longitudinal direction. The basic body includes at least one end-side drilling major cutting edge, a main flute which is assigned to said drilling major cutting edge and is wound at a first helix angle, and a plurality of reaming cutting edges which are arranged circumferentially on the basic body and have in each case one reamer flute which is assigned to the respective reaming cutting edge and is wound at a second helix angle. The reaming cutting edges adjoin the at least one major cutting edge directly in the longitudinal direction. Each reamer flute is merged into the main flute.