Glass Forming Machine Plunger End Position Control
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Solution Overview
Problem
Existing glass forming machines face challenges in producing high-quality glass parisons with minimal technical effort, as they struggle to adapt to changes in the volume of the blank mould cavity and often result in defects due to limited tolerance ranges and frequent mould replacement.
Innovation Solution
A glass forming machine equipped with a measuring device to monitor the end position of the plunger and a glass feeding device that adjusts the size of the gob of molten glass based on the measured end position, allowing for precise control of the glass stream and gob size, thereby maintaining high quality and extending the lifespan of blank moulds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the volume of the blank mould cavity changes during operation, then the manufacturing precision of parisons deteriorates, but increasing the tolerance range increases device complexity
Solution Approach 1:
The patent implements a feedback control system where a measuring device continuously monitors the end position of the plunger, and the glass feeding device automatically adjusts the gob size based on measured deviations. This closed-loop feedback mechanism maintains parison quality by compensating for cavity volume changes without requiring complex manual intervention or oversimplified rigid control
Solution Approach 2:
The system dynamically changes the parameter of gob size based on measured plunger position deviations. By adjusting the gob volume parameter in response to detected variations in cavity volume, the system maintains consistent parison quality despite mould degradation or thermal expansion effects
2Productivity
If the blank mould is used for extended periods, then productivity increases, but the manufacturing precision deteriorates due to cavity volume changes
Solution Approach 1:
The system performs preliminary measurement of the plunger end position and adjusts the gob size before the forming operation. This anticipatory adjustment ensures that even as the mould ages and cavity volume changes, the correct gob size is provided in advance to maintain parison quality throughout extended production periods
Solution Approach 2:
Continuous feedback monitoring of plunger position enables real-time detection of cavity volume changes that occur during extended mould usage. The system responds by adjusting subsequent gob sizes, allowing the mould to remain productive while maintaining precision despite long-term wear and thermal effects
3Manufacturing precision
If frequent mould replacement is performed to maintain precision, then manufacturing precision is maintained, but productivity decreases and loss of time increases
Solution Approach 1:
The feedback control system continuously monitors and compensates for cavity volume changes, eliminating the need for frequent mould replacements. By automatically adjusting gob sizes based on measured plunger positions, the system maintains parison quality throughout the entire mould lifecycle, preventing the productivity losses associated with repeated mould changes
Solution Approach 2:
The system changes the gob size parameter dynamically to compensate for mould degradation. This allows the mould to be used for its full service life without replacement, as precision is maintained through parameter adjustment rather than through frequent hardware replacement
4Device complexity
If the gob size is not adjusted according to plunger end position, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The system implements feedback control where the glass feeding device receives position information from the measuring device and automatically adjusts gob size accordingly. This relatively simple feedback loop maintains high manufacturing precision without requiring complex mechanical adjustment mechanisms or manual intervention
Solution Approach 2:
The glass feeding device changes the gob size parameter based on measured plunger end positions. This dynamic parameter adjustment achieves high precision parison formation while keeping the overall device structure relatively simple, avoiding the need for complex mechanical adjustment systems
Data Source
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AI summary
The invention relates to a glass forming machine and a method for manufacturing formed glass parisons. A glass forming machine includes a blank side for forming parisons (14) from gobs of molten glass (9). The blank side includes a plunger (10) and a blank mould (1). The plunger (10) can be moved into the blank mould (1) up to an end position. The plunger (10) can be moved out of the blank mould (1) up to a start position. The glass forming machine includes a glass feeding device (60) which is configured to bring a gob of molten glass (9) into the blank mould (1). The glass forming machine includes a measuring device which is configured to measure the end position of the plunger (10). The glass feeding device (60) is configured such that the size of a gob of molten glass (9) depends on the end position previously reached during operation. Thus, parisons of good quality can be produced with a bigger tolerance of mould volumina saving costs for the machine operator.