Shrink-Fit Tool Holder Coolant Jacket for High-Speed Machining
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Solution Overview
Problem
Existing tool holder devices with shrink-fit chucks face challenges in providing reliable coolant supply at high rotational speeds, as the coolant jet detaches from the tool, and existing designs often require excessive coolant throughput and high pump capacities, leading to inefficient cooling and potential coolant jet dispersion.
Innovation Solution
A tool holder device with a conically widening inner chamfer at the free end and a storage/collection space for coolant, allowing the coolant to exit as a closed or essentially closed coolant jacket around the tool shank, utilizing annular gaps and strategically designed flat grooves to guide coolant effectively and minimize jet expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If narrow grooves are used in the shrink-fit chuck, then the coolant exits in the form of three separate jets, but reliable cooling of the tool in the cutting/machining area is not ensured and the coolant jet detaches from the tool at high rotational speeds
Solution Approach 1:
The coolant supply channel is divided into multiple longitudinal grooves (typically three) distributed around the inner circumference of the receiving bore. Each groove acts as an independent coolant jet source, collectively forming a comprehensive cooling coverage around the tool shank.
Solution Approach 2:
The grooves are designed with specific dimensional characteristics (width, depth, spacing) to optimize coolant flow properties. The groove cross-section and positioning are tailored to ensure the coolant jets remain attached to the tool surface at high rotational speeds while providing effective cooling at the cutting area.
2Ease of operation
If coolant is guided through slots in the collet past the tool shank to the free end face, then coolant can escape through an annular gap, but the coolant discharge into the open air is relatively undefined and cannot ensure a clean cooling water jet flow along the tool
Solution Approach 1:
The annular gap formed by the outlet opening and tool shank acts as an intermediary structure that shapes and directs the coolant flow. This gap geometry serves as a flow guide that maintains a defined, clean coolant jet pattern as it exits the tool holder device.
3Object-affected harmful factors
If a baffle plate is used to define a storage or collection space for the coolant outside the receiving opening, then a coolant storage space can be created, but additional installation space in the direction of the longitudinal axis is required
Solution Approach 1:
The storage and/or collection space for coolant is integrated within the tool holder device body, nesting the coolant reservoir function inside the existing structural volume. This eliminates the need for external baffle plates and additional axial space, as the coolant storage is accommodated within the receiving bore area.
4Quantity of substance
If a considerable coolant flow rate is required for the tool holder device, then high pumping capacities are necessary for the coolant pumps
Solution Approach 1:
The coolant flow is segmented into multiple longitudinal grooves, distributing the total flow rate across several parallel channels. This segmentation improves flow distribution efficiency and reduces the energy required for pumping compared to a single large-flow channel.
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
Ensures efficient coolant supply to the cutting area with reduced coolant volume flow, maintaining effective cooling even at high speeds and preventing coolant dispersion, while allowing for longer tool lengths without excessive restrictions.
Implementation Method 1
even at high rotational speeds and under the influence of centrifugal forces
Implementation Method 2
a closed or substantially closed coolant jacket, which rests against the shank of the tool or the tool itself
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.