Vertical Silicon Ingot Grinding with Conical Self-Centering
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Solution Overview
Problem
Existing cylindrical grinders face challenges in maintaining process precision due to ingot deformation and positional deviation during the grinding of enlarged and weighted silicon single crystal ingots, particularly when holding the ingot in a transverse direction, which requires strong clamping forces and manual centering adjustments.
Innovation Solution
A cylindrical grinder design where the ingot is held vertically between an upper and lower support device, allowing the weight of the ingot to support itself and applying a weak clamping force to prevent deformation and positional deviation, with conical engaging holes for secure engagement and easy centering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ingot is held in a transverse direction using strong clamping forces, then the ingot can be securely held, but the ingot deforms and process precision deteriorates
Solution Approach 1:
The patent inverts the conventional transverse holding orientation to a vertical holding orientation. The ingot is held vertically between upper and lower support devices, allowing gravity to act along the axis of the ingot rather than perpendicular to it. This inversion eliminates the need for strong lateral clamping forces that cause deformation, while maintaining secure holding through the vertical configuration where the ingot's weight is supported by the lower support device.
2Measurement precision
If manual centering adjustments are performed, then the ingot can be positioned, but the operation becomes complex and time-consuming
Solution Approach 1:
The patent implements self-centering through conical engaging holes in the support devices. When the ingot is placed vertically, the conical geometry automatically guides and centers the ingot on the support device axes without requiring manual adjustment. The conical shape provides a self-aligning mechanism that eliminates complex centering operations while maintaining high positioning precision.
3Manufacturing precision
If the ingot is held vertically with weak clamping force, then deformation is prevented, but the ingot must be securely held without positional deviation
Solution Approach 1:
The patent uses the ingot's own weight as a counterbalancing force. By holding the ingot vertically, the weight acts downward along the axis, pressing the ingot firmly against the lower support device and preventing positional deviation. The upper support device provides minimal clamping force to prevent deformation, while the gravitational force ensures secure holding through the lower support, creating a self-stabilizing system.
Data Source
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AI summary
A cylindrical grinder is disclosed that includes a support unit including an upper support device and a lower support device, in which an ingot of silicon single crystal is interposed in a direction of axis line between the upper support device and the lower support device and is clampingly held to be rotated around the axis line, and a grinding unit that relatively moves along the direction of axis line of the ingot to traverse grind an outer circumference of the ingot. The upper support device is placed at an upper position and the lower support device is placed at a lower position, so that the support unit clampingly holds the ingot in a state in which the direction of the axis line of the ingot is disposed along a vertical direction.