Patent US5203188A successfully refreshed from Google Patents.
US5203188A
Expired / Lapsed
US
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System and method for monitoring a rolling mill
Assignee: Siemens Industry Inc
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Filing: 1991-09-16
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Granted: 1993-04-20
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Expires: 2011-09-16
Abstract
Abstract A system and method for monitoring a rolling mill which includes a data acquisition module that continually acquires, from mill instrumentation computers, time domain data relating to finished product gauge, entering product gauge, separating forces occurring at each roll stand in the mill, and RPMs of each roll in the roll stands over a calculated data acquisition time period. A monitoring CPU transforms the acquired data into the frequency domain in response to the rolls operating at an approximately constant speed over the data acquisition time period. A frequency spectrum correlation analysis is performed with the frequency domain data in order to identify the specific contributions to frequency amplitudes occurring in the finished product gauge frequency domain data. A determination is then made as to whether the identified frequency amplitudes exceed predetermined thresholds which correspond to a predetermined warning level and a maximum tolerance level of the finished product. A graphical display of those mill components contributing to near and out of tolerance finished product is provided.
Inventors
- 👤 Peter N. Osgood
- 👤 Thomas E. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:22
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/66
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
237 words
A rolling mill monitoring system for use in a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said system comprising: means for establishing a data acquisition time period; means for calculating roll frequency data corresponding to nominal roll frequencies of each of said rolls; means for acquiring data corresponding to measured separating forces at each roll stand while rolling said product, said measured separating forces data being acquired over said acquisition time period; means for acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands, said measured finish product gauge data being acquired over said data acquisition time period; means for transforming said measured separating forces data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured separating forces and finish product gauge; means for correlating said frequency amplitude data corresponding to said measured separating forces, said measured finish product gauge, and said nominal roll frequency data of each roll in order to derive matched frequency amplitude data which corresponds to each roll; and means for determining, in accordance with said matched frequency amplitude data, which of the rolls are contributing to the out of tolerance finish product.
Claim 2
Dependent Claim
237 words
A rolling mill monitoring system for use in a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said system comprising: means for establishing a data acquisition time period; means for calculating roll frequency data corresponding to nominal roll frequencies of each of said rolls; means for acquiring data corresponding to measured separating forces at each roll stand while rolling said product, said measured separating forces data being acquired over said acquisition time period; means for acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands, said measured finish product gauge data being acquired over said data acquisition time period; means for transforming said measured separating forces data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured separating forces and finish product gauge; means for correlating said frequency amplitude data corresponding to said measured separating forces, said measured finish product gauge, and said nominal roll frequency data of each roll in order to derive matched frequency amplitude data which corresponds to each roll; and means for determining, in accordance with said matched frequency amplitude data, which of the rolls are contributing to the out of tolerance finish product.
Claim 3
Dependent Claim
34 words
The system of claim 1 further comprising means for monitoring rotational speed of said rolls in order to determine whether said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 4
Dependent Claim
34 words
The system of claim 2, wherein said transforming means transforms said data in response to said monitoring means determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 5
Dependent Claim
33 words
The system of claim 1, wherein said means for determining determines whether the matched frequency amplitudes corresponding to each roll causes said finish strip gauge data to exceed at least one predetermined limit.
Claim 6
Dependent Claim
25 words
The system of claim 4 further comprising means for identifying rolls having corresponding matched frequency amplitude peaks that exceed said at least one predetermined limit.
Claim 7
Dependent Claim
30 words
The system of claim 5 further comprising means for displaying an indication of those rolls identified as having corresponding matched frequency amplitudes that exceed said at least one predetermined limit.
Claim 8
Dependent Claim
24 words
The system of claim 6 further comprising means for acquiring data corresponding to measured gauge of prefinished product over said data acquisition time period.
Claim 9
Dependent Claim
35 words
The system of claim 7, wherein said means for transforming transforms said measured prefinished product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to said measured prefinished product gauge.
Claim 10
Dependent Claim
34 words
The system of claim 8, wherein said transforming means transforms said data in response to a monitoring means determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 11
Dependent Claim
57 words
The system of claim 8, wherein said means for correlating correlates said frequency amplitude data corresponding to said measured finish product gauge data and said measured prefinished product gauge data in order to derive matched frequency amplitude data which corresponds frequency amplitude associated with said prefinished product gauge with frequency amplitude associated with said finish product gauge.
Claim 12
Dependent Claim
35 words
The system of claim 10, wherein said means for determining determines whether the matched frequency amplitude corresponding to said prefinished product gauge causes said finish strip gauge data to exceed at least one predetermined limit.
Claim 13
Dependent Claim
35 words
The system of claim 11, wherein said means for identifying identifies said prefinished product as having corresponding matched frequency amplitudes that cause said finish product gauge data to exceed said at least one predetermined limit.
Claim 14
Dependent Claim
30 words
The system of claim 12, wherein said means for displaying displays an indication that said prefinished product has corresponding matched frequency amplitudes that exceed said at least one predetermined limit.
Claim 15
Independent Claim
22 words
The system of claims 6 or 13, wherein said at least one predetermined limit corresponds to a predetermined maximum gauge tolerance level.
Claim 16
Dependent Claim
34 words
The system of claim 14, wherein said at least one predetermined limit comprises a first limit which when exceeded provides an indication that said finish product is approaching said predetermined maximum gauge tolerance level.
Claim 17
Dependent Claim
34 words
The system of claim 15, wherein said at least one predetermined limit comprises a second limit which when exceeded provides an indication that said finish product is exceeding said predetermined maximum gauge tolerance level.
Claim 18
Dependent Claim
23 words
The system of claim 16, wherein said means for acquiring data corresponding to measured gauge of prefinished product acquires entering product gauge data.
Claim 19
Dependent Claim
24 words
The system of claim 16, wherein said means for acquiring data corresponding to measured gauge of prefinished product acquires inter-roll stand product gauge data.
Claim 20
Independent Claim
215 words
A method for monitoring a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said method comprising the steps of: establishing a data acquisition time period; acquiring roll frequency data corresponding to nominal roll frequencies of each of said rolls; acquiring data corresponding to measured separating forces at each roll stand while rolling said product, said measured separating forces data being acquired over said acquisition time period; acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands over said data acquisition time period; transforming said measured separating forces data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured separating forces and finish product gauge; correlating said frequency amplitude data corresponding to said measured separating forces, said measured finish product gauge, and said nominal roll frequency data of each roll in order to derive matched frequency amplitude data which corresponds to each roll; and determining, in accordance with said matched frequency amplitude data, which of the particular rolls are contributing to the out of tolerance finish product.
Claim 21
Independent Claim
215 words
A method for monitoring a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said method comprising the steps of: establishing a data acquisition time period; acquiring roll frequency data corresponding to nominal roll frequencies of each of said rolls; acquiring data corresponding to measured separating forces at each roll stand while rolling said product, said measured separating forces data being acquired over said acquisition time period; acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands over said data acquisition time period; transforming said measured separating forces data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured separating forces and finish product gauge; correlating said frequency amplitude data corresponding to said measured separating forces, said measured finish product gauge, and said nominal roll frequency data of each roll in order to derive matched frequency amplitude data which corresponds to each roll; and determining, in accordance with said matched frequency amplitude data, which of the particular rolls are contributing to the out of tolerance finish product.
Claim 22
Dependent Claim
36 words
The method of claim 19 further comprising the step of monitoring rotational speed of said rolls in order to determine whether said rolls are operating at an approximate constant speed over said data acquisition time period.
Claim 23
Dependent Claim
32 words
The method of claim 20, wherein the step of transforming is carried out in response to determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 24
Dependent Claim
33 words
The method of claim 21 further comprising the step of determining whether the matched frequency amplitudes corresponding to each roll cause said finish strip gauge data to exceed at least one predetermined limit.
Claim 25
Dependent Claim
32 words
The method of claim 22 further comprising the step of identifying rolls having corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 26
Dependent Claim
38 words
The method of claim 23 further comprising the step of displaying an indication of those rolls identified as having corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 27
Dependent Claim
25 words
The method of claim 24 further comprising the step of acquiring data corresponding to measured gauge of prefinished product over said data acquisition time period.
Claim 28
Dependent Claim
24 words
The method of claim 25, wherein the step of acquiring data corresponding to measured gauge of prefinished product involves acquiring entering product gauge data.
Claim 29
Dependent Claim
25 words
The method of claim 25, wherein the step of acquiring data corresponding to measured gauge of prefinished product involves acquiring inter-roll stand product gauge data.
Claim 30
Dependent Claim
35 words
The method of claim 25 further comprising the step of transforming said measured prefinished product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to said measured prefinished product gauge.
Claim 31
Dependent Claim
57 words
The method of claim 28 further comprising the step of correlating said frequency amplitude data corresponding to said measured finish product gauge data and said measured prefinished product gauge data in order to derive matched frequency amplitude data which corresponds frequency amplitudes associated with said prefinished product gauge with frequency amplitudes associated with said finish product gauge.
Claim 32
Dependent Claim
36 words
The method of claim 29 further comprising the step of determining whether the matched frequency amplitudes corresponding to said prefinished product gauge cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 33
Dependent Claim
35 words
The method of claim 30 further comprising the steps of identifying said prefinished product as having corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 34
Dependent Claim
37 words
The method of claim 31 further comprising the step of displaying an indication that said prefinished product has corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 35
Independent Claim
22 words
The method of claims 24 or 32, wherein said at least one predetermined limit corresponds to a predetermined maximum gauge tolerance level.
Claim 36
Dependent Claim
34 words
The method of claim 33, wherein said at least one predetermined limit comprises a first limit which when exceeded provides an indication that said finish product is approaching said predetermined maximum gauge tolerance level.
Claim 37
Dependent Claim
34 words
The method of claim 34, wherein said at least one predetermined limit comprises a second limit which when exceeded provides an indication that said finish product is exceeding said predetermined maximum gauge tolerance level.
Claim 38
Dependent Claim
205 words
A rolling mill monitoring system for use in a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said system comprising: means for establishing a data acquisition time period; means for acquiring data corresponding to measured gauge of prefinished product, said measured prefinished product gauge data being acquired over said acquisition time period; means for acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands, said measured finish product gauge data being acquired over said data acquisition time period; means for transforming said measured prefinished product gauge data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured prefinished product gauge and finish product gauge; means for correlating said frequency amplitude data corresponding to said measured prefinished product gauge and said measured finish product gauge in order to derive matched frequency amplitude data; and means for determining, in accordance with said matched frequency amplitude data, whether said prefinished product contributes to the out of tolerance finish product.
Claim 39
Dependent Claim
205 words
A rolling mill monitoring system for use in a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said system comprising: means for establishing a data acquisition time period; means for acquiring data corresponding to measured gauge of prefinished product, said measured prefinished product gauge data being acquired over said acquisition time period; means for acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands, said measured finish product gauge data being acquired over said data acquisition time period; means for transforming said measured prefinished product gauge data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured prefinished product gauge and finish product gauge; means for correlating said frequency amplitude data corresponding to said measured prefinished product gauge and said measured finish product gauge in order to derive matched frequency amplitude data; and means for determining, in accordance with said matched frequency amplitude data, whether said prefinished product contributes to the out of tolerance finish product.
Claim 40
Dependent Claim
23 words
The system of claim 36, wherein said means for acquiring data corresponding to measured gauge of prefinished product acquires entering product gauge data.
Claim 41
Dependent Claim
24 words
The system of claim 36, wherein said means for acquiring data corresponding to measured gauge of prefinished product acquires inter-roll stand product gauge data.
Claim 42
Dependent Claim
34 words
The system of claim 36 further comprising means for monitoring rotational speed of said rolls in order to determine whether said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 43
Dependent Claim
34 words
The system of claim 39, wherein said transforming means transforms said data in response to said monitoring means determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 44
Dependent Claim
34 words
The system of claim 40, wherein said transforming means transforms said data in response to a monitoring means determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 45
Dependent Claim
35 words
The system of claim 39, wherein said means for determining determines whether the matched frequency amplitude corresponding to said prefinished product gauge causes said finish strip gauge data to exceed at least one predetermined limit.
Claim 46
Dependent Claim
35 words
The system of claim 42, wherein said means for identifying identifies said prefinished product as having corresponding matched frequency amplitudes that cause said finish product gauge data to exceed said at least one predetermined limit.
Claim 47
Dependent Claim
30 words
The system of claim 43, wherein said means for displaying displays an indication that said prefinished product has corresponding matched frequency amplitudes that exceed said at least one predetermined limit.
Claim 48
Dependent Claim
20 words
The system of claim 44, wherein said at least one predetermined limit corresponds to a predetermined maximum gauge tolerance level.
Claim 49
Dependent Claim
34 words
The system of claim 45, wherein said at least one predetermined limit comprises a first limit which when exceeded provides an indication that said finish product is approaching said predetermined maximum gauge tolerance level.
Claim 50
Dependent Claim
34 words
The system of claim 46, wherein said at least one predetermined limit comprises a second limit which when exceeded provides an indication that said finish product is exceeding said predetermined maximum gauge tolerance level.
Claim 51
Independent Claim
184 words
A method for monitoring a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said method comprising the steps of: establishing a data acquisition time period; acquiring data corresponding to measured gauge of prefinished product, said measured prefinished product gauge data being acquired over said acquisition time period; acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands over said data acquisition time period; transforming said measured prefinished product gauge data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured prefinished product gauge and finish product gauge; correlating said frequency amplitude data corresponding to said measured prefinished product gauge and said measured finish product gauge in order to derive matched frequency amplitude data; and determining, in accordance with said matched frequency amplitude data, whether said prefinished product contributes to the out of tolerance finish product.
Claim 52
Independent Claim
184 words
A method for monitoring a rolling mill to identify specific contributions to out of tolerance finish product, said rolling mill having a plurality of roll stands which support a plurality of rolls for rolling an entering product into a finish product, said method comprising the steps of: establishing a data acquisition time period; acquiring data corresponding to measured gauge of prefinished product, said measured prefinished product gauge data being acquired over said acquisition time period; acquiring data corresponding to measured gauge of said finish product after being rolled by said roll stands over said data acquisition time period; transforming said measured prefinished product gauge data and said measured finish product gauge data into the frequency domain so as to obtain frequency amplitude data corresponding to each of said measured prefinished product gauge and finish product gauge; correlating said frequency amplitude data corresponding to said measured prefinished product gauge and said measured finish product gauge in order to derive matched frequency amplitude data; and determining, in accordance with said matched frequency amplitude data, whether said prefinished product contributes to the out of tolerance finish product.
Claim 53
Dependent Claim
24 words
The method of claim 48, wherein the step of acquiring data corresponding to measured gauge of prefinished product involves acquiring entering product gauge data.
Claim 54
Dependent Claim
25 words
The method of claim 48, wherein the step of acquiring data corresponding to measured gauge of prefinished product involves acquiring inter-roll stand product gauge data.
Claim 55
Dependent Claim
36 words
The method of claim 48 further comprising the step of monitoring rotational speed of said rolls in order to determine whether said rolls are operating at an approximate constant speed over said data acquisition time period.
Claim 56
Dependent Claim
32 words
The method of claim 51, wherein the step of transforming is carried out in response to determining that said rolls are operating at approximately constant speed over said data acquisition time period.
Claim 57
Dependent Claim
36 words
The method of claim 52 further comprising the step of determining whether the matched frequency amplitudes corresponding to said prefinished product gauge cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 58
Dependent Claim
35 words
The method of claim 53 further comprising the steps of identifying said prefinished product as having corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 59
Dependent Claim
37 words
The method of claim 54 further comprising the step of displaying an indication that said prefinished product has corresponding matched frequency amplitudes that cause said finish strip gauge data to exceed said at least one predetermined limit.
Claim 60
Dependent Claim
20 words
The method of claim 55, wherein said at least one predetermined limit corresponds to a predetermined maximum gauge tolerance level.
Claim 61
Dependent Claim
34 words
The method of claim 56, wherein said at least one predetermined limit comprises a first limit which when exceeded provides an indication that said finish product is approaching said predetermined maximum gauge tolerance level.
Claim 62
Dependent Claim
34 words
The method of claim 57, wherein said at least one predetermined limit comprises a second limit which when exceeded provides an indication that said finish product is exceeding said predetermined maximum gauge tolerance level.
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