Slug float detecting device and detection method thereof
AssigneeAida Engineering, Ltd.
InventorAkira Harada
Life of this patent
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Abstract
A slug float detecting device comprising: a proximity member affixed on a stripper plate of press; an eddy-current sensor affixed on a lower die to measure clearance t for each increment of a crank angle; a memory device for storing a stripper motion that represents the relation between clearance t and the crank angle; and a calculating means for comparing the strip motion stored in the memory means with the stripper motion of the current stroke to detect a change, thus issuing abnormality warning signal to the press when said change is out of a specified range.
Claims15
A device for slug float detection comprising:
- a detection means for detecting displacement of a stripper plate provided on a die of a press in order to press down a material being worked, the displacement being detected for each crank angle, wherein the detection means generates stripper motions that each represents the relation between the displacement of the stripper plate and the crank angle;
- a memory means for storing said stripper motion generated by said detection means;
- a calculation means for detecting changes in the stripper motions by comparing the stripper motion representative of a current stroke with the stripper motion stored in the memory means;
- and
- an output means for outputting an abnormality warning signal to the press if the change amount detected by said calculation means is outside of a specified range.
A device for slug float detection comprising:
- a detection means for detecting displacement of a stripper plate disposed on a die of a press in order to press down a material, the detection means detecting the displacement for each crank angle, wherein the detection means generates a stripper motion profile that represents the relation between the displacement of the stripper plate and the crank angle for each stroke;
- a memory means for storing said stripper motion profile generated by said detection means;
- a calculation means for comparing the stripper motion profile of a current stroke with the stripper motion profile stored in the memory means and detecting any difference between the current stripper motion profile and the stripper motion profile stored in memory;
- and
- an output means for outputting an abnormality warning signal if the difference detected by said calculation means exceeds a threshold value.
A method for slug floating detection that controls a press, the method comprising the steps of:
- generating and storing a stripper motion that represents a displacement of a stripper plate for each crank angle;
- calculating a change in the stripper motion by comparing the stripper motion of a current stroke and the stored stripper motion;
- and
- outputting an abnormality warning signal if the calculated change exceeds a specified range.
A method for slug floating detection that controls a press characterized in:
- storing a stripper motion that represents a displacement of a stripper plate for each crank angle by means of sampling;
- detecting a change in the stripper motion by comparing the stripper motion of a current stroke with the stored stripper motion during the sampling;
- and
- outputting an abnormality warning signal if the calculated change exceeds a specified range.
Dependencies are inferred from the claim text.