Fracturing Tooth Wedge Design for Silicon Fragment Quality
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Solution Overview
Problem
Existing fracturing apparatuses for polycrystalline silicon face issues with fracturing tooth chipping, wear, and contamination, leading to inefficient production of high-quality fragments due to stress concentration and impurity introduction during the fracturing process.
Innovation Solution
The apparatus employs a pair of rolls with radially protruding fracturing teeth having a larger base-end diameter than the top-end portion, featuring a tapered base-end portion and a conical column part, which are wedged between a fixing cover and the roll to distribute impact stress evenly, preventing chipping and wear, and ensuring high-quality fragment production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fracturing teeth are used to fracture polycrystalline silicon, then fracturing efficiency is improved, but the teeth become chipped, worn, or broken due to rigid material properties
Solution Approach 1:
The fracturing tooth is designed with non-uniform geometry where the base-end portion has a larger diameter than the top-end portion, creating different local properties: the broader base distributes impact stress while the narrower top maintains fracturing effectiveness. This local quality variation resolves the contradiction by making the tooth both durable (through stress distribution) and effective (through concentrated impact points).
Solution Approach 2:
The fracturing tooth features a tapered base-end portion with curved surfaces that expand from the top toward the base. This curvature design allows for progressive stress distribution along the tooth structure, preventing stress concentration at any single point and thereby preventing chipping and wear while maintaining fracturing efficiency.
2Productivity
If fracturing teeth are used to fracture polycrystalline silicon, then fracturing efficiency is improved, but impurity is generated by abrasion of the teeth and mixed into fractured fragments
Solution Approach 1:
The optimized tooth geometry with its tapered base and broader base-end portion reduces surface area contact and minimizes abrasion at any single location. This local quality improvement distributes the wear over a larger volume of material, reducing the generation of abrasive particles that could contaminate the fractured silicon fragments.
Solution Approach 2:
The curved tapered surfaces of the base-end portion reduce point-contact friction and minimize localized abrasion. This curvature design prevents the generation of sharp abrasive particles while maintaining the tooth's effectiveness in fracturing the silicon, thereby reducing impurity contamination of the product.
3Strength
If the base-end portion of the fracturing tooth has a larger diameter, then stress concentration is reduced, but the tooth complexity increases
Solution Approach 1:
The tapered base-end portion uses a simple conical curvature that is straightforward to manufacture using standard machining processes. This curved geometry, while increasing stress distribution capability, does not significantly complicate the manufacturing process compared to achieving the same stress distribution through complex multi-component assemblies or precision-machined non-standard forms.
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 reduces stress concentration on fracturing teeth, preventing chipping and wear, and minimizes contamination, resulting in high-quality fractured fragments with improved control over fragment size and reduced impurity introduction.
Implementation Method 1
a tapered part is formed at the base-end portion so as to expand along a direction from the top-end portion toward the base-end portion; the fracturing tooth is inserted in each of the fixing hole; each of the fixing holes for fracturing teeth has a slope in which the tapered part of the fracturing tooth is in contact at a surface; the fracturing teeth unit is fixed to the roll in a state in which the top-end portion of the fracturing tooth is protruded from the fixing hole for fracturing tooth radially-outwardly of the roll and the tapered part of the fracturing tooth is wedged between the slope of the fixing cover and the roll
Data Source
AI summary
An apparatus for fracturing in which: a fracturing tooth is formed so that a base-end portion has a larger diameter than that of a top-end portion, and a tapered part is formed at the base-end portion so as to expand from the top toward the base; a fixing cover is formed along a longitudinal direction of rolls; in the fixing cover, fixing holes for fracturing teeth are formed along the longitudinal direction so that the fracturing tooth is inserted therein; each of the fixing holes has a slope in which the tapered part is in contact at a surface; a fracturing teeth unit is fixed to the roll in a state in which the top-end portion of the fracturing tooth is protruded from the fixing hole radially-outwardly of the roll and the tapered part is wedged between the slope of the fixing hole and the roll.