Cutting Tool Shank Recess Cooling Without Drilled Passages
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Solution Overview
Problem
Conventional cutting tools with internal coolant passages face high manufacturing costs due to difficult drilling processes and poor cooling performance caused by non-linear coolant passages that can be blocked or experience friction loss.
Innovation Solution
A cutting tool design featuring coolant-guiding recesses on the outer peripheral surface of the shank, forming a coolant channel with the tool-fixing hole, allowing coolant to be jetted directly to the cutting edge without the need for deep-hole drilling and enabling linear coolant flow, thus reducing costs and improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant passages are formed by drilling multiple elongated holes in the cutting tool, then coolant can be delivered to the cutting area, but manufacturing costs become tremendous due to the difficulty of drilling holes in high hardness metal
Solution Approach 1:
The invention extracts the coolant passage formation from the cutting tool body itself and relocates it to the tool holder. The coolant passages are now formed in the tool holder through simple drilling, while the cutting tool receives coolant through its outer peripheral surface. This separation resolves the contradiction by making passage formation easy (in the tool holder) while maintaining effective coolant delivery (to the cutting tool).
Solution Approach 2:
The tool holder acts as an intermediary component that receives coolant from the coolant supply system and delivers it to the cutting tool. The tool holder contains the coolant passages and delivers coolant to the cutting tool's outer peripheral surface, mediating between the coolant supply system and the cutting tool to achieve both easy manufacture and effective coolant delivery.
2Strength
If the coolant passage makes a turn to avoid cutting inserts or cutting edges, then the cutting tool maintains structural rigidity, but cooling performance deteriorates because coolant may be blocked or experience higher friction loss
Solution Approach 1:
The invention changes the spatial dimension of coolant delivery from internal passages within the cutting tool to external delivery along the outer peripheral surface. Coolant is delivered through the tool holder and then applied to the cutting tool's outer surface, allowing linear flow without turns while maintaining structural integrity of the cutting tool.
Solution Approach 2:
The coolant passage is extracted from the cutting tool body and relocated to the tool holder. This allows the cutting tool to maintain its structural rigidity with cutting inserts or edges while the coolant flows linearly through the tool holder without needing to make turns.
3Ease of operation
If the coolant passage makes a turn to reach the outer end of the cutting tool, then the cutting edges can be positioned optimally, but friction loss increases and coolant flow is reduced
Solution Approach 1:
The coolant passage is extracted from the cutting tool and placed in the tool holder, enabling linear coolant flow without turns. This eliminates friction loss while allowing cutting edges to be positioned optimally on the cutting tool without being constrained by internal passage routing.
Solution Approach 2:
The tool holder serves as an intermediary that provides a linear coolant pathway from the coolant supply system to the cutting tool's outer peripheral surface. This intermediary structure eliminates the need for turns in the coolant passage, reducing friction loss while maintaining optimal cutting edge positioning.
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
The solution significantly reduces machining costs and enhances cooling performance by eliminating the need for deep-hole drilling and allowing continuous coolant flow to the cutting area without blockages or friction loss.
Implementation Method 1
The coolant channel formed by the at least one coolant-guiding recess enables coolant from the coolant-supply system to be jetted toward the cutting portion
Data Source
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AI summary
A cutting tool (10) with through coolant has an elongated shank (11) and a cutting portion (12). An outer peripheral surface of the shank (11) is configured to be surrounded and tightly held by a hole-wall defined by a tool-fixing hole (921) of a machine tool (92). At least one coolant-guiding recess (111) is formed in the outer peripheral surface of the shank (11) and extends along a lengthwise direction of the shank (11). Each coolant-guiding recess (111) forms a coolant channel (112) together with the tool-fixing hole (921). An end of the coolant channel (112) is connected to a coolant-supply system (922). The coolant channel formed by the coolant-guiding recess (111) enables coolant from the coolant-supply system (922) to be jetted toward the cutting portion (12). The cutting tool (10) provides through coolant without drilled holes, thereby saving cost.