Methods for creating control charts using a computer system
First Claim
1. A method for creating a new control chart using a computer, the method comprising:
- providing a database including a plurality of statistical process control (SPC) control charts and a plurality of tables;
determining that information stored in at least one of the plurality of tables has changed;
determining whether the changed information is describable by at least one of the plurality of SPC control charts;
updating the at least one of the plurality of SPC control Charts with the changed information using the computer, upon a determination that the changed information is describable by at least one of the plurality of SPC control charts;
creating a new control chart that can describe the changed information, upon a determination that the changed information cannot be described by at least one of the plurality of SPC control charts;
determining whether the new control chart is a new trend chart, which is a control chart that has not been previously used on tools of a type that is associated with the new control chart;
calculating a plurality of control limit values, for the new control chart, when the new control chart is a new trend chart;
determining whether the control limit values of the new control chart are the same as control limit values of at least one of the plurality of SPC control charts, when the new control chart is not a new trend chart;
using on-line values for the control limit values of the new control chart, when the control limit values are the same;
sending a command to the server for determining whether tocreate the new control chart, and what control limit values to set for the new control chart, when the control limit values are not the same; and
applying the SPC control charts for monitoring production in manufacturing.
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Abstract
A method is disclosed for creating a new control chart in a basic record system that includes a server and a database coupled to the server. The method includes the steps of storing a number of SPC control charts and a number of tables in the database and determining whether information stored in at least one of the tables has changed. If the information has changed, the method then determines whether the changed information can be described by at least one of the SPC control charts. If the changed information can be described, then the method updates at least one of the SPC control charts with the changed information. If the changed information cannot be described, then the method creates a new control chart that can describe the changed information.
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Citations
19 Claims
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1. A method for creating a new control chart using a computer, the method comprising:
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providing a database including a plurality of statistical process control (SPC) control charts and a plurality of tables; determining that information stored in at least one of the plurality of tables has changed; determining whether the changed information is describable by at least one of the plurality of SPC control charts; updating the at least one of the plurality of SPC control Charts with the changed information using the computer, upon a determination that the changed information is describable by at least one of the plurality of SPC control charts; creating a new control chart that can describe the changed information, upon a determination that the changed information cannot be described by at least one of the plurality of SPC control charts; determining whether the new control chart is a new trend chart, which is a control chart that has not been previously used on tools of a type that is associated with the new control chart; calculating a plurality of control limit values, for the new control chart, when the new control chart is a new trend chart; determining whether the control limit values of the new control chart are the same as control limit values of at least one of the plurality of SPC control charts, when the new control chart is not a new trend chart; using on-line values for the control limit values of the new control chart, when the control limit values are the same; sending a command to the server for determining whether to create the new control chart, and what control limit values to set for the new control chart, when the control limit values are not the same; and applying the SPC control charts for monitoring production in manufacturing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A statistical process control (SPC) control chart building method for use with a computer, the method comprising:
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checking data stored in a database that stores a plurality of SPC control charts and tables to ascertain whether any of the data has changed; checking at least one of the plurality of tables and determining whether the changed data is describable by any of the plurality of SPC control charts, when any of the data has changed; building a new control chart using the computer when the SPC control charts cannot describe the changed data; determining whether the new control chart is a new trend charts which is a control chart that has not been previously used on tools of a type that is associated with the new control chart; calculating values of a plurality of control limits of the new control chart using a predetermined function, when the new control chart is a new trend chart; using on-line values to fit into the control limits of the new control chart, when the new control chart is not a new trend chart and the control limits of the new control chart are the same as the ones in the existing SPC control charts; and generating an alarm, when the new control chart is not a new trend chart and the control limits of the new control chart are not the same as the ones in the existing SPC control charts. - View Dependent Claims (19)
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Specification