Custom quality control monitoring of a steel making process

• US 5,854,749 A
• Filed: 07/12/1996
• Issued: 12/29/1998
• Est. Priority Date: 07/19/1995
• Status: Expired due to Fees

• Current Assignee: Republic Engineered Steels, Inc.
• Original Assignee: Republic Engineered Steels, Inc.
• Inventors: Michelon, Giovanni, Kellams, James, Morsut, Luigi
• Primary Examiner(s): RUGGIERO, JOSEPH F
• Application Number:
  US08/679,100
• Time in Patent Office: 900 Days
• Field of Search: 364/472.02, 364/472.03, 364/468.16, 364/468.17, 364/552, 364/188, 364/189, 395/965, 395/969, 395/970, 395/613, 395/904, 395/912, 395/919, 395/922, 148/541, 164/4.1, 164/451, 164/452, 164/154.1, 164/155.1, 164/449.1, 164/413, 164/414, 266/80, 266/96, 707/102
• US Class Current: 700/146
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: Y10S 715/965 for process control and configuration

Abstract

A system for monitoring a continuous steel casting process wherein one or more strands of steel are cast from a mold, allowed to cool and then cut into blooms. A plurality of sensors monitor process parameters at different locations relative to a strand of steel as the strand exits the mold, cools and is cut. A storage device stores data representations of the parameters as they are monitored by the plurality of sensors. A data network communicates data from the plurality of sensors to the storage device. A logic processor coupled to the storage device prompts an operator as the operator sets up logic relations between parameters of the steel casting process that identify and categorize defects in steel. The logic processor includes a mathematical parser for evaluating the logic relations between parameters and converting the logic relations to processor instructions used to evaluate the data representations of the parameters for defects.

Claims

1. A method for monitoring a steel manufacturing process in real-time, the method comprising the steps of:

(a) displaying a user interface on a display to prompt an operator to define one or more groups of quality control events, wherein each group corresponds to one of a plurality of steel manufacturing processes;

(b) displaying a user interface on the display to prompt the operator to define for each group one or more quality control events by defining one or more logical relationships based on one or more of a plurality of steel manufacturing process variables;

(c) casting one or more strands of steel in accordance with one of the plurality of steel manufacturing processes by pouring molten steel into a mold of a continuous caster;

(d) sensing the process variables from the continuous caster as the one or more steel strands are cast;

(e) maintaining a process variable database of data representing the sensed process variables;

(f) determining whether any of the one or more logical relationships defined by the operator for the group corresponding to the one steel manufacturing process used for the casting step (c) have been satisfied based on the maintained data in the process variable database;

(g) determining one or more defects in one or more steel strands if one or more logical relationships have been satisfied as determined for the determining step (f);

(h) determining one or more segments of the one or more steel strands where the determined one or more defects are located; and

(i) storing in a production database data representing the determined one or more defects and the determined one or more steel segments.

2. The method of claim 1, wherein the displaying step (b) comprises the step of prompting the operator to define the one or more logical relationships while the one or more steel strands are cast for the casting step (c).

3. The method of claim 1, wherein each steel manufacturing process corresponds to a grade of steel.

4. The method of claim 1, wherein the determining step (g) comprises the step of determining a severity of the determined one or more defects.

5. The method of claim 1, wherein the determining step (g) comprises the step of determining an influence range for the determined one or more defects.

6. The method of claim 1, comprising the step of:

displaying a user interface on the display to prompt the operator to record a defect of one or more steel strands as determined by the operator upon visual detection and storing data representing the visual defect in the production database.

7. The method of claim 1, wherein the displaying step (b) comprises the step of prompting the operator to define for each quality control event a defect location attribution.

8. The method of claim 1, wherein the displaying step (b) comprises the step of prompting the operator to define for each quality control event one or more defects corresponding to a logical relationship for the quality control event.

9. The method of claim 1, wherein each segment of the one or more steel strands is a bloom.

10. A system for monitoring a steel manufacturing process in real-time, the system comprising:

(a) a plurality of sensors for sensing a plurality of steel manufacturing process variables from a continuous caster as one or more steel strands are cast in accordance with one of a plurality of steel manufacturing processes;

(b) a process variable database for maintaining data representing the sensed process variables;

(c) a data network for communicating data from the plurality of sensors to the process variable database;

(d) a display;

(e) a production database; and

(f) a logic processor for;

(i) displaying a user interface on the display to prompt an operator to define one or more groups of quality control events, wherein each group corresponds to one of the plurality of steel manufacturing processes,

(ii) displaying a user interface on the display to prompt the operator to define for each group one or more quality control events by defining one or more logical relationships based on one or more of the process variables,

(iii) determining whether any of the one or more logical relationships defined by the operator for the group corresponding to the one steel manufacturing process used to cast the one or more steel strands have been satisfied based on the maintained data in the process variable database,

(iv) determining one or more defects in one or more steel strands if one or more logical relationships have been satisfied as determined by the logic processor,

(v) determining one or more segments of the one or more steel strands where the determined one or more defects are located, and

(vi) storing in the production database data representing the determined one or more defects and the determined one or more steel segments.

11. The system of claim 10, wherein the logic processor prompts the operator to define the one or more logical relationships while the one or more steel strands are cast.

12. The system of claim 10, wherein each steel manufacturing process corresponds to a grade of steel.

13. The system of claim 10, wherein the logic processor determines a severity of the determined one or more defects.

14. The system of claim 10, wherein the logic processor determines an influence range for the determined one or more defects.

15. The system of claim 10, wherein the logic processor displays a user interface on the display to prompt the operator to record a defect of one or more steel strands as determined by the operator upon visual detection and stores data representing the visual defect in the production database.

16. The system of claim 10, wherein the logic processor prompts the operator to define for each quality control event a defect location attribution.

17. The system of claim 10, wherein the logic processor prompts the operator to define for each quality control event one or more defects corresponding to a logical relationship for the quality control event.

18. The system of claim 10, wherein each segment of the one or more steel strands is a bloom.