Grinding Wheel Internal Impeller Coolant Delivery
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Solution Overview
Problem
Conventional coolant delivery methods in grinding wheels are inefficient, particularly for internal features, as they rely on external nozzles that may block the line of sight and interfere with the tool path, leading to potential wheel failure and equipment damage due to inadequate coolant distribution.
Innovation Solution
The grinding wheel incorporates an internal impeller structure with circumferentially spaced blades that create grooves for coolant delivery, ensuring efficient distribution by expelling coolant at an optimal angle relative to the wheel's circumference, allowing for precise coolant delivery to the machining zone without external nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external nozzles are used for coolant delivery, then coolant can be supplied to the machining zone, but the nozzles may block the line of sight and interfere with the tool path
Solution Approach 1:
The coolant delivery system is nested within the grinding wheel structure itself. The wheel body contains internal coolant channels and impeller structures that transport coolant from the center to the periphery, eliminating the need for external nozzles and providing unobstructed tool path clearance while maintaining reliable coolant delivery to the machining zone
Solution Approach 2:
The grinding wheel body acts as an intermediary between the coolant supply source and the machining zone. It incorporates internal coolant transport mechanisms including channels and impeller structures that mediate the delivery of coolant to the grinding interface, removing the need for external nozzle intermediaries that would obstruct the tool path
2Temperature
If coolant flow rate is increased to ensure adequate cooling, then heat extraction improves, but coolant waste increases
Solution Approach 1:
The impeller structure creates localized high-velocity coolant jets that are precisely directed at the grinding interface. The blade geometry and arrangement are optimized to concentrate coolant flow exactly where heat generation occurs, maximizing cooling effectiveness while minimizing the total volume of coolant required and reducing waste
Solution Approach 2:
The impeller blades are designed with specific angles and geometries that transform the coolant flow parameters. The blades accelerate the coolant and control its exit angle, optimizing the kinetic energy and directional precision of the coolant jet to enhance cooling efficiency while reducing the quantity of coolant needed
3Temperature
If coolant is delivered as close as possible to the machining zone, then cooling efficiency improves, but the complexity of the delivery system increases
Solution Approach 1:
The grinding wheel body serves multiple functions: it provides the structural form of the wheel, contains the abrasive grains on its surface, and incorporates the coolant delivery system within its structure. This multi-functionality integrates the coolant channels and impeller structures into the wheel body itself, delivering coolant close to the machining zone without adding separate complex delivery mechanisms
Solution Approach 2:
The coolant delivery system is merged with the grinding wheel body structure. The channels and impeller structures are integrated into the wheel's internal architecture, combining the functions of wheel support and coolant delivery into a single unified structure, thereby reducing overall system complexity while achieving precise coolant delivery to the grinding interface
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 internal coolant delivery system enhances coolant distribution, preventing wheel failure and equipment damage by ensuring consistent coolant delivery to the machining zone, even for complex workpieces with obstructed line of sight, and minimizes coolant waste.
Implementation Method 1
rotating the grinding wheel; moving the coolant fluid from the inlet along a plurality of internal grooves of the grinding wheel outwardly towards a plurality of outlets
Data Source
AI summary
A grinding wheel including an impeller structure for circulating coolant within the wheel defining a plurality of grooves. An angle between a second wall of each groove and a tangent to the outer circumference adjacent the groove outlet is defined based on the desired coolant flow rate, the predetermined wheel rotational speed, the radius of the outer circumference of the impeller structure, the combined surface area of the groove outlets, and a desired angle of exit of the coolant being at most 15 degrees. Also, a wheel is disclosed where the angle of the second wall of each groove is defined based on the desired coolant flow rate, the combined surface area of the groove outlets, the tangential speed of the wheel, and a value of n being at least 0.9 and less than 1. A method for distributing a coolant to a grinding site is also discussed.