Rake-Face Coolant Tool Tip for Edge Cooling and Chip Flow
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Solution Overview
Problem
Conventional tool tips for machining metal objects face inefficiencies in coolant delivery and chip evacuation, leading to suboptimal cooling and lubrication of cutting edges during drilling processes.
Innovation Solution
A tool tip design featuring multiple discharge orifices on the rake face of major cutting edges, arranged to ensure even coolant distribution and access to the cutting area, with orifices spaced closely to the cutting edge and connected to curved coolant channels to enhance flow and reduce cavitation, increasing the total flow area and improving coolant delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional techniques with several orifices are used for coolant delivery, then the tool tip structure is simple, but the coolant flow and cooling effectiveness are insufficient
Solution Approach 1:
The coolant delivery system is segmented into multiple discharge orifices (at least three) arranged in a specific pattern on the rake face, with each orifice connected to coolant channels. This segmentation allows distributed coolant delivery across the cutting area, improving cooling effectiveness while maintaining a relatively simple overall structure.
Solution Approach 2:
The discharge orifices are positioned at specific locations on the rake face, spaced at distances of 5-15% of the tool tip diameter from the major cutting edge. This local positioning optimizes coolant delivery precisely where it is needed at the cutting zone, enhancing cooling effectiveness without requiring a complex delivery system throughout the entire tool.
2Temperature
If discharge orifices are positioned close to the cutting edge to improve cooling, then cooling effectiveness increases, but chip evacuation becomes difficult
Solution Approach 1:
The discharge orifices are arranged in a specific spatial pattern on the rake face, with at least three orifices positioned to deliver coolant both close to the cutting edge and in a direction that facilitates chip evacuation. This dimensional arrangement on the rake face surface allows simultaneous achievement of effective cooling and chip flow path clearance.
Solution Approach 2:
The coolant acts as an intermediary substance that serves dual functions: it cools the cutting edge by being delivered through orifices close to the cutting zone, and it facilitates chip evacuation by flowing through the chip flutes. The curved coolant channels and orifice positioning ensure the coolant performs both cooling and chip removal assistance simultaneously.
3Quantity of substance
If multiple discharge orifices are used to increase coolant flow, then cooling effectiveness improves, but the tool tip structure becomes more complex
Solution Approach 1:
The multiple discharge orifices and associated coolant channels serve multiple functions simultaneously: they deliver coolant to the cutting zone for cooling, create flow patterns that assist chip evacuation, and can be integrated into the existing tool tip geometry. This multi-functionality increases coolant flow effectiveness without proportionally increasing structural complexity.
Solution Approach 2:
The coolant channels are designed with curved paths leading to the discharge orifices on the rake face. This curvature optimizes coolant flow dynamics, reducing cavitation and improving delivery efficiency to multiple orifices, thereby achieving increased coolant flow volume without requiring a proportionally complex channel network.
4Ease of manufacture
If orifices are spaced far from the cutting edge to simplify manufacturing, then manufacturing is easier, but coolant access to the cutting area is reduced
Solution Approach 1:
The spacing of discharge orifices from the major cutting edge is optimized to specific parameter ranges: distances of 5-15% of the tool tip diameter. This parameter optimization ensures orifices are positioned close enough to provide effective coolant access to the cutting zone, while remaining within manufacturable tolerances for standard drilling and machining operations.
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 design improves coolant flow and chip evacuation, reducing heat buildup and friction, leading to increased tool life and efficiency in machining processes by ensuring effective cooling and lubrication of cutting edges.
Implementation Method 1
the curved channel improving coolant flow by reducing cavitation
Implementation Method 2
The coolant provides lubrication and cooling to the cutting edges and removes the chips from the hole
Implementation Method 3
The coolant provides lubrication and cooling to the cutting edges
Data Source
Figure 1A~1C
Figure 1B
Figure 1D~1F
AI summary
A tool tip being integral with or being configured to be removably secured to a tool body and configured to machine a metal object. The tool tip (16;16') has a tool tip diameter (D;D'), a rotational axis (A;A') and at least one coolant duct (44;78'). The tool tip (16;16') comprises at least one major cutting edge (28;28') formed at an intersection of a rake face (24;24') and a first major flank (26A;26A'). The rake face forms part of a chip flute. The coolant duct is configured to be in flow communication with discharge orifices (46;46') exclusively in the tool tip (16;16'). The tool tip (16;16') has an arrangement, such as a row, of two or more discharge orifices (46;46') exclusively in the rake face (24;24') of a major cutting edge. The arrangement extends at a non-zero angle (α) relative to the rotational axis (A;A').