Twist Drill Web Geometry for Larger Chip Space Without Core Weakening
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Solution Overview
Problem
Existing drilling tools face limitations in chip space extension, which can lead to clogging and reduced chip transportation efficiency due to the weakening of the supporting cross-section when enlarging flutes, and the current methods for enlarging chip spaces are limited in effectiveness.
Innovation Solution
The drilling tool incorporates a chip space extension that reduces web width laterally, allowing for increased chip space without weakening the core diameter, and includes features like variable flute depth and coolant ducts to enhance chip transportation and mechanical loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the flutes are enlarged by grinding to create chip space extension, then the chip space volume is increased, but the supporting cross section (core diameter) is weakened
Solution Approach 1:
Instead of enlarging flutes in the radial direction (which would reduce core diameter), the invention extends the chip space axially by reducing web width. This dimensional shift allows chip space extension without compromising the supporting cross section, as the web reduction occurs along the flute length rather than at the core.
Solution Approach 2:
The web width reduction is applied locally in specific regions where chip space extension is needed, rather than uniformly throughout. This allows selective enlargement of chip space in critical areas while maintaining adequate web strength in other regions, resolving the contradiction between chip space volume and supporting cross section strength.
2Productivity
If the web width is reduced to extend chip space laterally, then the chip transportation capability is improved, but the structural robustness may be compromised
Solution Approach 1:
The invention achieves chip space extension by reducing web width (lateral extension) rather than increasing flute depth radially. This lateral extension improves chip transportation capability by providing additional chip flow path area, while the reduced web width is compensated by optimizing the remaining web structure to maintain structural robustness.
Solution Approach 2:
The web width parameter is modified in controlled manner to extend chip space, while other geometric parameters (such as web thickness in cross-section, material distribution) are adjusted to compensate and maintain structural robustness. This parameter optimization resolves the contradiction between chip transportation and structural strength.
3Stability of the object's composition
If chip space extension is formed on all flutes, then uniform mechanical loading is achieved, but the manufacturing complexity increases
Solution Approach 1:
The chip space extension is implemented as a modular feature that can be applied to each flute independently through standardized grinding procedures. This segmentation allows uniform mechanical loading across all flutes while using repeatable manufacturing processes, thereby reducing overall manufacturing complexity despite the additional feature.
Data Source
AI summary
A drilling tool, in particular a twist drill, has a substantially cylindrical main body formed with a shank portion, a cutting-edge portion having a drill diameter, and a drill end. The drilling tool is rotatable in a direction of rotation about a drill longitudinal axis. At least two flutes extend in a twisted manner along the drill longitudinal axis and are inclined with at least one helix angle. The flutes form a chip space. Webs are formed between the flutes with a web width. The chip space is formed with a chip space extension that enlarges the chip space in at least part of at least one of the flutes. The web width is reduced in the region of the chip space extension.