Deep-Hole Drill Rake Face Segmentation for Easy Regrinding
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Solution Overview
Problem
Deep hole drills with straight grooves and planar rake faces face challenges in regrinding, particularly when machining tough and long-chipping materials, as existing methods require precise CNC grinding and are not easily accessible for user-level regrinding, leading to high costs and tool breakage risks.
Innovation Solution
The introduction of multiple chip-forming devices or depressions in the rake face, parallel to the cutting edge, allows for easy regrinding on a simple grinding machine, maintaining the existing coating and geometry, and preventing chip accumulation, while ensuring consistent quality and extended tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single chip-forming device extends parallel to the outer cutting edge, then favorable chip formation is achieved, but the drill head must be ground down by the width of the chip-forming device requiring precise CNC grinding
Solution Approach 1:
The single chip-forming device is segmented into multiple smaller chip-forming devices arranged in sequence along the cutting edge. This segmentation allows the drill tip to be ground down incrementally, removing only the worn portion and one chip-forming device at a time, rather than requiring removal of the entire chip-forming device width. This enables simpler grinding operations that can be performed on basic grinding machines rather than requiring precise CNC grinding equipment.
2Ease of operation
If multiple chip-forming devices are arranged in the rake face, then easy regrinding on simple machines is enabled, but manufacturing complexity increases
Solution Approach 1:
Multiple chip-forming devices are pre-configured into the rake face during manufacturing, creating a ready-to-use structure that enables simple incremental regrinding. The preliminary arrangement of multiple devices means that when regrinding is needed, the user simply removes the worn tip and one chip-forming device to expose the next, without requiring complex manufacturing operations at the user level.
3Ease of repair
If the drill tip is ground down to create a new cutting edge, then the cutting edge is renewed, but the existing coating is removed requiring recoating
Solution Approach 1:
Instead of grinding down the entire drill tip including the coated rake face, only the necessary portion at the very tip is removed - just enough to expose the next chip-forming device and create a fresh cutting edge. This partial action approach renews the cutting edge while preserving the existing coating on the rake face, eliminating the need for time-consuming and costly recoating operations.
Data Source
AI summary
The invention relates to a single-lip drill and a double-lip drill having a plurality of chip-forming devices or depressions in the rake face which are arranged in succession and at a distance from one another. As soon as a cutting edge and/or the associated chip-forming device or the associated depression is worn, the deep hole drill according to the invention can be reground using simple means.