Molten Glass Shear Control for Offset Gob Cutting Stability

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Solution Overview

Problem

Existing molten glass cutting apparatuses face challenges in maintaining a proper cut end and gob drop position due to deviations in the central axis of the molten glass, especially when temperature changes affect viscosity, leading to improper cutting and positioning issues.

Innovation Solution

A molten glass cutting apparatus with a control unit that adjusts the position of the shear blades' cutting edges to ensure simultaneous contact with the molten glass, offsetting the cutting position when the central part of the molten glass deviates from the central axis to prevent shaking and maintain proper cutting and positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the tip parts of a pair of shear blades overlap to cut molten glass, then the cut end quality is improved, but when the central part of molten glass deviates from the central axis, the cutting timing becomes unbalanced causing shaking and positioning deviation

Engineering Contradiction:

Improvecut end qualityVSAvoidcutting stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies dynamics by making the shear blade position adjustable rather than fixed. The control unit dynamically adjusts the position of the second shear blade based on the detected offset amount of the molten glass central part, allowing the cutting system to adapt to varying glass flow conditions and maintain reliable cutting performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the positional parameter of the shear blade to compensate for molten glass offset. By adjusting the position of the second shear blade according to the detected offset, the system modifies the cutting parameters to ensure both cutting edges contact the glass simultaneously, maintaining cut quality and stability.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the central part of molten glass deviates from the central axis due to viscosity changes, then one cutting edge contacts glass earlier than the other, but this causes great shaking and improper cut end

Engineering Contradiction:

Improvemolten glass flowVSAvoidcut end quality

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent implements feedback by using an imaging device to detect the offset amount of the molten glass central part and feeding this information back to the control unit. The control unit then adjusts the second shear blade position based on this feedback, creating a closed-loop control system that maintains cutting precision despite variations in glass flow.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces purely mechanical cutting with a controlled system that uses optical detection (imaging device) and electronic control (control unit) to adjust the mechanical cutting process. This substitution allows for precise measurement and adjustment of the cutting parameters based on real-time glass position detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If the shear blades are positioned to overlap at the central axis, then cutting is effective when glass is centered, but the gob drop position deviates when glass offset occurs

Engineering Contradiction:

Improvecutting efficiencyVSAvoidgob drop position

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent makes the shear blade positioning dynamic rather than static. The control unit adjusts the position of the second shear blade based on detected glass offset, allowing the system to maintain both cutting efficiency and accurate gob drop positioning under varying conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the positional parameter of the second shear blade to compensate for glass offset. By adjusting this parameter based on the detected offset amount, the system maintains proper cutting geometry and ensures the gob drops at the correct position despite variations in glass flow alignment.

Inventive Principle:

Principle #35Parameter changes

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 solution allows for satisfactory cutting of molten glass and accurate gob positioning, preventing deviations in the cut end and drop position, even when the molten glass is offset from the central axis, thus improving the manufacturing process.

Implementation Method 1

shearing force by cutting edges of a pair of the shear blade cuts molten glass extruded from an orifice formed at a bottom part of the spout

Methodology Applied

Scientific EffectShear stress: Shear Stress

Data Source

PatentUS12129200B2Molten glass cutting apparatus and glass product manufacturing apparatus

Publication Date: 2024.10.29 NIHON TAISANBIN INDU KK

AI summary

A molten glass cutting apparatus comprises a pair of shear blades and a control unit that controls a pair of the shear blades to relatively move toward each other. The control unit controls a pair of the shear blades to relatively move so that tip parts of a pair of the shear blades overlap, and shearing force by cutting edges of a pair of the shear blade cuts molten glass extruded from an orifice formed at a bottom part of a spout. When a central part of molten glass is offset with respect to a central axis of the orifice, the control unit offsets a position of cutting by a pair of the cutting edges to a side of the central part with respect to the central axis.