Press Vibration Timing Detection for Punch Strike and Cracking
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Solution Overview
Problem
Existing methods for detecting the start and cracking timings in high-speed pressing machines are inaccurate due to wear of the punch and variations in conditions, and they often require load sensors which can be difficult to retrofit.
Innovation Solution
An information processing apparatus and method that uses a vibration accelerometer to detect vibrations and identify the start and cracking timings based on the amplitude of the vibration waveform, allowing for accurate detection without the need for load sensors and providing insights into punch wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a vibration accelerometer is used to detect strike timing, then the measurement can be performed without load sensors, but the detection accuracy deteriorates due to punch wear and condition variations
Solution Approach 1:
The system performs preliminary detection of the strike vibration waveform and stores it as a reference before actual measurement. This preliminary reference waveform is used to account for punch wear and condition variations, enabling accurate timing detection without requiring load sensors or complex retrofitting.
Solution Approach 2:
The system compares the actual vibration waveform against a reference waveform and uses the phase difference information to determine strike timing. This feedback mechanism compensates for variations caused by punch wear and different pressing conditions, maintaining measurement precision while using simple accelerometer-based detection.
2Device complexity
If phase comparison with preset waveform is used to determine strike timing, then the measurement method is simple, but the accuracy deteriorates when the vibration waveform is out of predetermined range
Solution Approach 1:
The system dynamically adjusts the reference waveform based on the detected strike vibration characteristics. Instead of using a fixed preset waveform, the reference is updated to match actual operating conditions, allowing the simple phase comparison method to remain accurate even when waveforms vary outside predetermined ranges.
3Measurement precision
If load sensors are used to identify contact and penetrating times, then the timing detection can be accurate, but the device complexity and cost increase
Solution Approach 1:
The system replaces mechanical load sensors with a vibration accelerometer that measures vibrational characteristics during the pressing process. By analyzing the phase of the vibration waveform and comparing it to a reference, the system achieves accurate timing detection of contact and penetrating moments without requiring complex mechanical sensing equipment.
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
Accurately determines the start and cracking timings in pressing processes, enabling effective monitoring of punch wear and improving the diagnostic capabilities of pressing machines, applicable to various pressing works like shearing, bending, and forming.
Implementation Method 1
a vibration accelerometer to detect vibrations
Implementation Method 2
detecting, with the vibration accelerometer, a vibration at the time of the strike of the punch
Data Source
AI summary
An information processing apparatus includes circuitry to obtain detected information representing a detected vibration generated in processing on a workpiece, and detect, based on the detected information, a start timing at which a punch has started striking the workpiece and a cracking timing at which the punch has cracked the workpiece.