Patent ID: 6295478
Filing Date: 2001-09-25
Classification: G05B,Y02P

Abstract:
A manufacturing process change control apparatus that is provided in a manufacturing control system for a manufacturing process, said manufacturing process change control apparatus performing a control change in said manufacturing process with respect to information generated from said manufacturing process, said manufacturing process change control apparatus comprising:means for recording a plurality of change items for which manufacturing process change control is to be performed, information required for a judgment, and a judgment method;information extracting and recording means for extracting said required information after a change point for each of said change items stored in said recording means, said required information being extracted from information generated from said manufacturing process, and for recording said required information therein;comparison judgment means for statistically performing a comparison judgment of said required information obtained from a period before and a period after said change point for each change item and extracted by said information extracting and recording means; andoutput means for outputting a comparison judgment result of said comparison judging means,wherein said recording means records a process sequence maintenance history, a process conditions maintenance history, an equipment maintenance history, and a material lot change history, andwherein a plurality of predetermined data items are selected for recording comprising the maintenance histories of selected manufacturing parameters, the change date and time, the compared process data name, the test method, the number of tests, and the test time of each item being stored.