Tool Holder Coolant Jacket for Stable High-Speed Jet Guidance
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Solution Overview
Problem
Existing tool holder devices with coolant supply channels, such as shrink chucks, face challenges in maintaining a reliable coolant flow to the cutting area, especially at high rotational speeds, due to the design of narrow grooves which lead to coolant jet detachment and inefficient cooling, and require high coolant throughput.
Innovation Solution
A tool holder device with a coolant accumulation and collection space at the free end, connected to the surroundings via an annular gap, where the coolant is discharged through a jet-forming gap surrounding the tool shank, ensuring a closed coolant jacket and efficient coolant guidance without excessive restrictions on tool length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If narrow grooves are used for coolant supply, then the coolant flow is concentrated, but the coolant jet detaches from the tool at high rotational speeds
Solution Approach 1:
The receiving opening is divided into multiple longitudinal grooves that are distributed around the circumference, creating multiple coolant supply paths. This segmentation allows the coolant to be delivered in a controlled manner while maintaining attachment to the tool even at high rotational speeds.
Solution Approach 2:
The grooves are designed with specific cross-sectional characteristics (narrow width relative to depth) to optimize coolant flow behavior. This local geometric quality ensures that the coolant jet remains attached to the tool surface along the entire length of the grooves, preventing detachment at the free end.
2Reliability
If high coolant throughput is used, then reliable cooling is achieved, but high pump capacities are required
Solution Approach 1:
The groove cross-sectional parameters are optimized to achieve efficient coolant flow. By controlling the ratio of groove width to depth and the distribution of grooves around the circumference, the system achieves reliable cooling with reduced coolant throughput, thereby lowering pump capacity requirements.
3Quantity of substance
If longitudinal grooves are used in the receiving opening, then coolant can be conducted along the tool, but the coolant exits as singular jets rather than a bundled jet
Solution Approach 1:
The receiving opening is segmented into multiple longitudinal grooves distributed around the circumference. This segmentation creates multiple coolant flow paths that maintain bundled jet configuration along the tool length, preventing the coolant from exiting as separate singular jets at the free end.
4Object-affected harmful factors
If the coolant jacket is formed close to the tool at high speeds, then jet atomization is minimized, but the coolant jet must be precisely guided
Solution Approach 1:
The grooves are designed with specific local geometric characteristics (narrow cross-section, controlled depth-to-width ratio) that ensure the coolant jet remains attached to the tool surface. This precise local geometry control prevents jet detachment and minimizes atomization even at high rotational speeds.
Solution Approach 2:
The grooves follow the curved surface of the tool shank, with their cross-sections oriented to match the cylindrical geometry. This curvature alignment ensures that the coolant jet naturally follows the tool contour, maintaining attachment and minimizing atomization under centrifugal forces.
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 ensures reliable coolant supply to the cutting area, even at high speeds, by forming a closed coolant jacket around the tool, minimizing jet atomization and expansion, and maintaining efficient cooling with reduced coolant volume flow.
Implementation Method 1
a coolant supply device (11) for supplying the coolant to the receiving opening (7)
Implementation Method 2
particularly at high rotational speeds during operation of the chuck, which occur in particular with small tool diameters, the coolant jet emerging from the front side detaches from the tool
Data Source
Figure 1~1a
Figure 2~2a
Figure 3~3a
AI summary
The tool holding device (1) has a tool holding body (2) for torque proof holding of a rotation tool (5) with a shaft (5'). A coolant controlling system (12) is formed as a flat groove at an inner side (9) of a receiving opening (7). A coolant accumulation chamber or collecting chamber is connected with the periphery of the tool holding device by an annular space.