Electric heating – Metal heating – Cutting or disintegrating
Patent
1989-06-12
1991-04-23
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
73 4R, 73 375, 36447404, 364552, 408 2, B23H 914, B23H 720
Patent
active
050102249
ABSTRACT:
An improved manufacturing method produces small orifices in a succession of work pieces according to a desired flow specification. After the work pieces are subjected to one or more preliminary processing steps, an apparatus, preferably an electro discharge machine, is used to produce a small orifice in each work piece. A gas, preferably nitrogen, is flowed through the orifice produced in a work piece, and the pressure drop of the gas flowing through the orifice is measured, preferably by a pressure gauge capable of providing both a visual display for a human operator and an electrical signal for a microprocessor. The pressure drop is compared to a correlation of pressure drop and the desired flow specification. The results of the comparison are used to determine whether an adjustment is needed to the apparatus and/or one of the preliminary processing steps. The comparison can involve the use of a distribution curve, and an adjustment can be made when the comparison result falls within what appears to be a new distribution curve. A statistical process control plan such as the Shainin Precontrol Method or the Shewhart X,R Chart Method can be used to reduce the frequency of performing the step of flowing the gas through the orifice. The adjustments can be made automatically by using a microprocessor to make the comparison and to initiate the adjustments in the apparatus that produces the small orifice.
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Laurenzi Robert J.
Nelson Michael T.
Shirey Roy D.
Evans Geoffrey S.
Lucas Industries plc
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