Die Cushion Load Detection for Double-Blank Press Monitoring
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Solution Overview
Problem
Existing double-blank detection methods in press machines are unreliable due to complex press load signals, susceptibility to eigenfrequency, and low resolution, making it difficult to accurately detect abnormalities in die cushion apparatuses without causing damage.
Innovation Solution
A double-blank detecting apparatus that uses a die cushion load signal instead of press load, with a position signal acquiring unit and a load signal acquiring unit to detect the slide position and die cushion load, allowing for reliable detection of double blanks by comparing slide position signals with abnormality determination values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If press load signal is used for double blank detection, then the detection method is simple, but the detection accuracy deteriorates due to signal complexity and eigenfrequency interference
Solution Approach 1:
The patent extracts the die cushion load signal from the complex press load signal to perform double blank detection. By isolating the die cushion load component, the detection system avoids the interference of forming load and eigenfrequency effects, achieving accurate detection without requiring complex signal processing of the overall press load
Solution Approach 2:
The patent introduces the die cushion load as an intermediary measurement parameter for double blank detection. Instead of directly measuring the complex press load, the system uses the die cushion load signal as a mediator that correlates with double blank conditions while being less susceptible to noise and interference
2Device complexity
If press load signal is used for double blank detection, then the detection system is simple, but the detection reliability deteriorates due to eigenfrequency susceptibility
Solution Approach 1:
The patent extracts the die cushion load signal from the press load system to perform detection, isolating it from the eigenfrequency effects that plague the overall press load measurement. This extraction enables reliable detection without requiring complex filtering or damping systems
3Device complexity
If the same load detector is used for both press load and die cushion load detection, then the device configuration is simple, but the resolution of press load detection deteriorates
Solution Approach 1:
The patent introduces the die cushion load detection as an intermediary function that leverages the high-resolution measurements already available in the die cushion control system. This intermediary approach provides accurate double blank detection without requiring additional dedicated detectors
Data Source
AI summary
A double-blank detecting apparatus for a press machine that is provided with a die cushion apparatus and is configured to form blanks one by one automatically and repeatedly. The double-blank detecting apparatus includes: a position signal acquiring unit configured to acquire a slide position signal indicating a position of a slide of the press machine; a load signal acquiring unit configured to acquire a die cushion load signal indicating a die cushion load generated on a cushion pad of the die cushion apparatus; and a double-blank detector configured to detect a state in which a plurality of blanks are stacked as a double blank based on the slide position signal acquired by the position signal acquiring unit and the die cushion load signal acquired by the load signal acquiring unit.