EDM Re-Truing of Diamond Grinding Wheels for Precise Profiles
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Solution Overview
Problem
Current methods for reprofiling diamond grinding wheels are not precise and cost-effective, particularly for high-value applications like solar panels, where precision grinding is critical and the cost of diamond grit materials is increasing, leading to quality issues in edge profile grinding.
Innovation Solution
A process involving a lathe table with an edged cutting tool to remove material from the wheel's steel edge and a rotating electrical discharge profiling tool for precise machining of the abrasive matrix surface, using an electrical discharge machine with a reconfigurable electrode to restore the wheel's profile without replacing the electrode, applicable to wheels with both steel sides or single steel walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an abrasive grit grinding wheel is used to remove material and re-profile the grinding wheel, then the wheel can be resurfaced, but the manufacturing precision and cost-effectiveness deteriorate
Solution Approach 1:
The patent replaces the mechanical abrasive grit grinding process with an electrical discharge machining (EDM) process. The EDM system uses electrical discharges between an electrode and the grinding wheel surface to remove material precisely, eliminating the need for mechanical contact and abrasive removal. This substitution enables high-precision profile restoration while reducing costs by allowing the use of less expensive electrode materials that can be repeatedly reused.
2Productivity
If traditional abrasive grinding methods are used for retruing, then material can be removed, but the cost increases and precision decreases
Solution Approach 1:
The patent replaces traditional mechanical abrasive grinding with electrical discharge machining. The EDM process uses controlled electrical discharges to erode material from the grinding wheel surface, achieving superior precision in edge profile restoration. This method maintains high productivity through automated electrode rotation and programming while delivering significantly improved manufacturing precision compared to abrasive methods.
Solution Approach 2:
The patent changes the fundamental machining parameter from mechanical abrasion to electrical discharge. By controlling electrical parameters such as voltage, current, and pulse duration in the EDM process, the system achieves precise material removal with minimal thermal damage. This parameter change enables both high productivity through rapid material removal rates and superior precision through controlled discharge energy.
3Manufacturing precision
If diamond grit materials are used extensively, then grinding precision is maintained, but the cost increases due to material value
Solution Approach 1:
The patent changes the material removal mechanism from mechanical abrasion requiring diamond grit to electrical discharge machining. This parameter change eliminates the need for expensive diamond grit materials while maintaining high precision through controlled electrical discharges. The EDM process achieves comparable or superior precision without consuming valuable diamond materials, significantly reducing material costs.
Solution Approach 2:
The patent employs relatively inexpensive electrode materials such as graphite or copper that can be easily replaced or reconditioned, replacing the need for expensive diamond grit materials. The electrodes are consumed at a much lower cost compared to diamond grit, and when worn, they can be quickly replaced or re-profiled, making the overall process more cost-effective while maintaining precision.
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 process provides a precise and cost-effective method for reprofiling diamond grinding wheels, enabling superior edge grinding capabilities for solar panels and other glass surfaces by efficiently removing material and reshaping the abrasive matrix surface, reducing the need for frequent electrode replacement and improving the accuracy of the grinding process.
Implementation Method 1
providing a rotating electrical discharge profiling tool attached to an electrical discharge machine ("EDM"), for rotating the profiling tool along an axis in a direction to provide electrical discharge profiling of the abrasive matrix surface of the wheel. Then profiling of the wheel by electrical discharge machining of the abrasive matrix surface with a rotating electrode.
Data Source
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AI summary
A process for retruing a profile in an abrasive wheel is provided. A lathe table including an edged cutting tool is used for fixturing a grinding wheel having an outside metal edge and an abrasive matrix adjacent thereto for rotation along an axis compatible for lathe removal of material at at least the outside edge of said wheel. A predetermined amount of material along said edge with the edged lathe cutting tool is removed using the lathe cutting tool. A rotating electrical discharge profiling tool which is attached to an electrical discharge machine is used for profiling of the wheel by electrical discharge machining of the abrasive surface with the rotating electrode. The process uses a machine specifically designed for electrical discharge machining of the profile. The machine also has a mechanism cutting a predetermined profile into the electrode without removing it from the machine.