Grinding Method for Hard Substrates Using Dynamic Water Control
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Solution Overview
Problem
Existing grinding methods face challenges in reducing the grinding load while preventing excessive wear of grinding abrasive stones, especially when processing hard substrates like silicon carbide or sapphire.
Innovation Solution
A grinding method that involves a two-step process: the first step uses a higher grinding water amount to suppress wear of the abrasive stones, while the second step reduces the water amount to promote self-sharpening and dressing of the stones, thereby reducing the grinding load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the water amount of grinding water is set small to promote self-sharpening and reduce grinding load, then the grinding load is reduced, but the wear of grinding abrasive stones increases excessively
Solution Approach 1:
The method applies preliminary action by reducing water amount only in the final stage after rough grinding is complete. This timing allows the abrasive stones to first perform their cutting function with adequate cooling, then undergo controlled wear to sharpen edges when the workpiece is already close to finished dimensions, minimizing both overall wear and maximum grinding load
Solution Approach 2:
The invention implements dynamics by dynamically adjusting the water amount based on processing stage. The water supply is changed from a constant high amount during rough grinding to a reduced amount in the final stage, allowing the system to adapt to changing requirements: adequate cooling during heavy material removal versus controlled sharpening during final finishing
2Power
If the water amount of grinding water is set small at the beginning of processing to facilitate biting of grinding abrasive stones, then the grinding load is reduced, but when dulling has occurred from previous workpiece processing, it becomes impossible to suppress the rise in spindle current value
Solution Approach 1:
The method uses preliminary action by ensuring adequate water supply during rough grinding to prevent premature dulling of abrasive stones. This preliminary protection maintains the cutting edges in good condition throughout the majority of material removal, so when the final low-water stage begins, the stones are still sharp and can effectively bite into the workpiece without causing spindle current spikes
3Loss of time
If the water amount of grinding water is set small to promote self-sharpening, then self-sharpening is promoted, but the frequency of replacement of grinding wheel increases
Solution Approach 1:
The invention applies dynamics by making the water amount adjustable based on processing stage. During rough grinding, adequate water prevents excessive wear and maintains wheel life. In the final stage, water is reduced to promote controlled self-sharpening. This dynamic adjustment allows the grinding wheel to serve its full functional life while still achieving the self-sharpening effect when most beneficial
Solution Approach 2:
The method uses preliminary action by protecting the abrasive stones through adequate water supply during the majority of the grinding process. This preliminary protection prevents premature wear and extends wheel life, allowing the stones to reach a point where controlled self-sharpening can occur without immediately requiring wheel replacement
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 method effectively reduces the grinding load while preventing excessive wear of the abrasive stones, ensuring efficient processing and prolonged tool life.
Implementation Method 1
supplying grinding water with a first grinding water amount that allows suppression of wear of the grinding abrasive stones
Implementation Method 2
a grinding water supply unit that supplies grinding water to an upper surface of the workpiece held by the holding table in such a manner that the flow rate is adjustable
Data Source
AI summary
A grinding method includes a first grinding step of executing grinding feed of a rough grinding unit and grinding the workpiece to a predetermined thickness while supplying grinding water with a first grinding water amount that allows suppression of wear of grinding abrasive stones and a second grinding step of, after executing the first grinding step, promoting dressing of the grinding abrasive stones to prepare for processing of the next workpiece through executing grinding feed of the rough grinding unit and grinding the workpiece to the finished thickness while supplying the grinding water with a second grinding water amount that increases wear of the grinding abrasive stones and promotes self-sharpening through reduction relative to the first grinding water amount.