Tool Holder Nozzle Ring Integration for Coolant Jet Stability
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Solution Overview
Problem
Existing tool holders, particularly shrink fit chucks, face issues with reliable cooling lubricant injection due to increased centrifugal force causing jet widening and separation of medium components, and require precise fitting to avoid leaks and breakage, especially when handling different tool diameters.
Innovation Solution
The nozzle ring is integrated close to the axis of rotation within an annular recess of the chuck, fixed via connecting means, and features inclined nozzle bores for targeted medium injection, with a sealing surface to prevent leakage, and optional adhesive or welded connections for secure attachment, ensuring easy assembly and use across various diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the nozzle ring is positioned farther from the tool shank to accommodate different tool diameters, then adaptability is improved, but centrifugal force increases causing jet widening and medium component separation
Solution Approach 1:
The device is divided into modular components: a detachable nozzle ring that can be independently replaced or adjusted, allowing the nozzle position to be optimized for different tool diameters without affecting the entire chuck system. This segmentation enables adaptability while maintaining proper spray characteristics.
Solution Approach 2:
The nozzle ring is designed with adjustable or interchangeable positioning capabilities, allowing dynamic adaptation to different tool diameters. The connecting means enable the nozzle ring to be repositioned or replaced to maintain optimal distance from the tool shank across various tool sizes, preventing jet widening while preserving versatility.
2Adaptability or versatility
If radial clamping screws are used to create distance from the tool shank, then adaptability is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The clamping mechanism is segmented into a separate nozzle ring component with its own dedicated connecting means, independent from the main chuck clamping system. This allows the nozzle ring to be positioned and secured separately, simplifying the overall device complexity while maintaining adaptability.
Solution Approach 2:
The nozzle ring acts as an intermediary component between the chuck and the tool shank, providing the necessary distance and positioning without requiring complex integration into the main clamping mechanism. The connecting means serve as intermediaries to secure this intermediate component.
3Reliability
If the front groove is made with precise fit to avoid leaks, then sealing is improved, but manufacturing precision requirements and risk of breakage increase
Solution Approach 1:
The sealing function is segmented into a dedicated sealing arrangement between the nozzle ring and chuck, separate from the front groove interface. This dedicated sealing interface can be optimized independently, achieving reliable sealing without requiring high precision in the main groove fit, thereby reducing manufacturing complexity and breakage risk.
Solution Approach 2:
A dedicated sealing element or sealing interface acts as an intermediary between the nozzle ring and chuck, providing reliable sealing without requiring precise metallic-to-metallic fits. This intermediary sealing mechanism reduces the manufacturing precision requirements while maintaining sealing reliability.
4Strength
If wall thickness is increased to avoid breakage, then strength is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The chuck system is segmented into a main chuck body and a separate nozzle ring component. The nozzle ring can be manufactured with optimized wall thickness for its specific function, while the main chuck body maintains its structural integrity requirements. This segmentation allows each component to be manufactured with appropriate thickness without compromising strength or increasing overall manufacturing difficulty.
Solution Approach 2:
The nozzle ring is extracted as a separate component from the main chuck body, allowing it to be manufactured independently with optimized dimensions. This extraction enables the use of thinner, easier-to-manufacture walls for the nozzle ring while the main chuck body retains sufficient thickness for structural strength, reducing overall manufacturing difficulty.
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 ensures reliable and efficient cooling lubricant injection, maintains jet focus at high speeds, and simplifies tool centering and assembly, reducing the risk of nozzle bore breakage and leakage, while accommodating different tool diameters with enhanced sealing and flow efficiency.
Implementation Method 1
the nozzle ring is firmly connected to the chuck via a detachable screw connection or a non-detachable material connection as a connecting means
Implementation Method 2
the nozzle ring is permanently connected to the chuck, preferably on its outer surface, by means of an adhesive or welded connection
Implementation Method 3
the nozzle ring is permanently connected to the chuck, preferably on its outer surface, by means of an adhesive or welded connection
Implementation Method 4
A distance from the tool shank is created by the inner flank of the face groove, as a result of which the centrifugal force on the medium passed through is increased. This can lead to an unwanted widening of the jet and a separation of components of the medium.
Implementation Method 5
The nozzle ring ( 18) has a sealing surface for abutment against a chuck ( 12) in order to form a sealing arrangement with the chuck ( 12)
Implementation Method 6
which has a hollow clamping area accessible via a front opening for clamping the tool shank of a rotary tool, and is preferably designed as a shrink fit chuck
Implementation Method 7
In addition, assembly and, if necessary, replacement of the nozzle ring is also simplified, without there being any special requirements for the contour of the chuck. In principle, simple use is possible with all clamping systems with a mounting hole
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a tool holder comprising a chuck (12) which can be rotatably driven about an axis of rotation (15) and has a hollow clamping portion (28), accessible via an end opening (30), for clamping a rotary tool (16), and comprising a nozzle ring (18) which is mounted on the end of the chuck (12) and has nozzle holes (20) for spraying the rotary tool (16) with a liquid and/or gaseous medium. According to the invention it is proposed that the nozzle ring (18) be accommodated in an annular recess (32) in the chuck (12) which expands the end opening (30) in stages, the nozzle ring (18) being fixed in the annular recess (32) by connecting means (34), and having an inner jacket (36) which forms a radial boundary for the insertion of the rotary tool (16).