Glass Gob Cutting Synchronization for Uniform Quality
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Solution Overview
Problem
Existing glass article manufacturing systems face issues with gob deformation and uneven arrival times at preform molds due to varying travel distances, leading to inconsistent cooling and quality problems.
Innovation Solution
A system where each cutting blade pair has separate actuators for controlled movement, allowing blades to cut at different times based on the distance each gob needs to travel, ensuring all gobs arrive at preform molds simultaneously, with synchronized horizontal and vertical blade movement to prevent deformation and ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting blades are moved horizontally to sever gobs from vertically flowing glass strands, then gobs can be separated and delivered to preforms, but the glass strand accumulates atop the cutting blades causing gob deformation
Solution Approach 1:
The cutting blades are made dynamically synchronized with the glass strand flow. The blades move vertically in sync with the strand during cutting, then retract horizontally. This dynamic coordination prevents strand accumulation and deformation while maintaining high cutting frequency
Solution Approach 2:
The cutting blades are positioned and synchronized in advance with the glass strand flow rate. By pre-coordinating the blade movement with the strand discharge timing, the system prevents accumulation before it occurs, ensuring consistent gob formation without deformation
2Productivity
If multiple gobs are separated simultaneously and delivered to adjacently positioned preforms, then production efficiency is maintained, but gobs travel different distances causing uneven cooling and temperature differences
Solution Approach 1:
The system pre-calculates and pre-coordinates the cutting timing for each strand based on its distance to the preform. Strands farther away are cut earlier, allowing their gobs to travel longer distances, while closer strands are cut later. This preliminary timing adjustment ensures all gobs arrive simultaneously and maintain uniform temperature
Solution Approach 2:
The control system uses feedback from the glass supply rates and preform positions to adjust cutting timing dynamically. By monitoring the actual flow conditions and delivery distances, the system optimizes the cutting sequence to compensate for variations, ensuring uniform gob arrival times and temperatures across all preforms
3Manufacturing precision
If an auxiliary plunger device is added to prevent glass strand accumulation on cutting blades, then gob deformation is prevented, but the system becomes more complicated and less efficient for high cutting frequencies
Solution Approach 1:
The auxiliary plunger device is completely removed from the system. Instead, the cutting blades themselves are modified to perform dual functions: they cut the glass and simultaneously synchronize their movement with the strand flow. This extraction of the auxiliary device simplifies the system while maintaining precision
Solution Approach 2:
The cutting blades are given multi-functionality by making them dynamically synchronized with the glass strand flow. They perform both the cutting function and the strand management function that previously required a separate plunger device. This universal approach eliminates additional components while achieving the same protective effect
Data Source
AI summary
Glass articles are made by continuously emitting a plurality of strands of molten glass spaced different distances from respective preform molds, cutting through each of the strands by moving together a respective pair of blades to form a respective gob, and transporting the gobs through the respective distances to the preform molds. The pairs of blades are operated, that is moved from an open to a closed position, such that they cut through the respective strands one after the other with the first formed gob traveling through the longest distance to the respective preform mold and the last formed gob traveling through the shortest distance to the respective preform mold.