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US 12,182,750 B2Granted
Method and computer programme for discovering possible errors in a production process
AssigneeSMS group GmbH
InventorsKatja Windt, Marc Hütt
Life of this patent
Estimating the term…
Abstract
A method and a computer program for discovering possible errors in a production process for manufacturing metal products. The method involves removing at least one process parameter value from the cluster or adding at least one process parameter to the cluster. Second Z-score values, which are compared with the first Z-score values, are then determined for the thus-altered cluster. The changes in the Z-score values provide suggestions for troubleshooting and process optimization which are direct and can be implemented immediately.
Claims14
A method comprising:
- defining a plurality of process parameters representing a production process in a parameter space of the production process;
- detecting or specifying values for the plurality of process parameters;
- grouping a part of the plurality of parameter values into a cluster in the parameter space;
- applying a performance enrichment analysis to the cluster and to a performance indicator assigned to the cluster in order to determine a first dependency between the cluster and the performance indicator, wherein the dependency is evaluated with a first Z-score value;
- generating a modified cluster by removing from the cluster or adding to the cluster a process parameter value;
- applying the performance enrichment analysis to the modified cluster and the assigned performance indicator to determine a second Z-score value between the modified cluster and the assigned performance indicator;
- and
- determining a change between the first Z-score value and the second Z-score value as a measure of the influence of the process parameter value removed from the cluster or added to the cluster;
- and
- indicating a possibility of an error in the production process when the change exceeds a defined threshold value, wherein the performance indicator of the production process involves the following attributes:
- quality devaluations of a created metal product or scrap quantities;
- on-time schedule variances;
- or
- output quantities.
11 more elements
A method comprising:
- defining a plurality of process parameters representing a production process in a parameter space of the production process;
- detecting or specifying values for the plurality of process parameters;
- grouping a part of the plurality of process parameter values into a cluster in the parameter space;
- applying a performance enrichment analysis to the cluster and to an external process parameter value of the parameter space not assigned to the cluster in order to determine a first dependency between the cluster and the external process parameter value, wherein the dependency is evaluated with a first Z-score value;
- generating a modified cluster by removing from the cluster or adding to the cluster at least a process parameter value;
- applying of the performance enrichment analysis to the modified cluster and the external process parameter value to determine a second Z-score value between the modified cluster and the external process parameter value;
- and
- determining the change between the first Z-score value and the second Z-score value as a measure of the influence of the process parameter value removed from the cluster or added to the cluster;
- and
- indicating a possibility of an error in the production process when the change exceeds a defined threshold value, wherein the performance indicator of the production process involves the following attributes:
- quality devaluations of a created metal product or scrap quantities;
- on-time schedule variances;
- or
- output quantities.
11 more elements
Dependencies are inferred from the claim text.