CN103464468B - Method for controlling weight deviation through after-rolling length of hot-rolled steel bar - Google Patents
Method for controlling weight deviation through after-rolling length of hot-rolled steel bar Download PDFInfo
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Abstract
The invention discloses a method for controlling weight deviation through after-rolling length of a hot-rolled steel bar. A numerical relationship model between the weight deviation of a steel bar and the weight of a single ingot blank, the oxidation burning loss of the single ingot blank, the rolling process cutting loss of the single ingot blank and the total after-rolling length of the hot-rolled steel bar is established, the control on the weight deviation is realized through adjusting the total after-rolling length of the hot-rolled steel bar, and the numerical relationship model of the parameters is shown in the formula. The method has the advantages that the operability is strong and the method is easy to master, the weight deviation of a hot-rolled ribbed steel bar can be measured by means of monitoring and stabilizing the piece weight of an ingot blank, tracing the weight deviations corresponding to the after-rolling total lengths of different specifications of hot-rolled ribbed steel bars and utilizing the after-rolling total length which is displayed in online and real-time manners, of the hot-rolled ribbed steel bar, so that the effects of visualization and real-time monitoring are realized, the frequency and number of sampling are greatly reduced, and the labor intensity of workers is reduced.
Description
Technical field
The invention belongs to reinforcing bar rolling technical field, particularly relate to a kind of hot-rolled ribbed and plain bar rolls rear cut to lengthen deviation of weight method by hot-rolled reinforced bar.
Background technology
In standard GB/T 1499.2-2007 " concrete reinforcement steel part 2 hot rolled ribbed bars " and GB1499.1-2008 " concrete reinforcement steel part 1 hot calendering round bar ", the deviation of weight of different size hot-rolled reinforced bar is made and has explicitly called for.According to the rules, often criticize reinforcing bar and roll rear needs sampling and carry out weighing and detect rear calculating, just can know deviation of weight.In production reality, often find the problem of following two aspects: one is because reinforcing bar detection of weighing belongs to sampling observation, after rolling condition in the sampling observation time interval changes, the change of reinforcing bar deviation of weight can not Timeliness coverage, only has could find and corresponding adjustment to have hysteresis quality after sampling observation next time; Two is because reinforcing bar poker size has fluctuation, and the measurement result of the different reinforcing bar deviation of weight of sampling point is also different, can not reflect the deviation of weight actual state of whole reinforcing bar all-sidedly and accurately.For above problem, the art of this patent has invented effective computational methods, not only solves problem, and greatly reduces the sampling frequency, reduces the labour intensity of workman, achieves good effect.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, provide a kind of hot-rolled ribbed and plain bar to be rolled the method for rear cut to lengthen deviation of weight by hot-rolled reinforced bar.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar, set up the deviation of weight of reinforcing bar and single strand weight, single strand oxidization burning loss, single strand operation of rolling cut damage, hot-rolled reinforced bar rolls numerical relation model between rear total length, the adjustment of rolling rear total length by hot-rolled reinforced bar realizes the control of deviation of weight, and the numerical relation model of described each parameter is:
In formula: the deviation of weight of F-reinforcing bar, W
0-mono-strand weight, W
1-mono-strand oxidization burning loss, W
2-mono-the strand operation of rolling cuts damage, and L-hot-rolled reinforced bar rolls rear total length, the theory every meter weight of M-reinforcing bar,
-correction factor.
Described list props up strand oxidization burning loss W
1for single strand weight W
00.8 ~ 1.2%.
Described list props up the strand operation of rolling and cuts damage W
2for single strand weight W
00.8 ~ 1.6%.
The described method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar, is comprised the following steps:
Step 1: single strand weight W
0calculating, according to the target control size of single strand and the solid density of strand, calculate single strand theoretical weight;
Step 2: single strand oxidization burning loss W
1for single strand weight W
00.8 ~ 1.2%;
Step 3: single the strand operation of rolling is cut and damaged W
2, be single strand weight W
00.8 ~ 1.6%;
Step 4: the deviation of weight F calculating reinforcing bar
1, found the theory every meter weight M of different size reinforcing bar by national standard, obtain hot-rolled reinforced bar by online display in real time and roll rear total length L, then by W
0, W
1, W
2substitute into relational expression, obtain: F
1=[(W
0-W
1-W
2)/(L × M)-1] × 100%;
Step 5: practice examining deviation of weight F
2, the reinforcing bar different parts after single strand rolling is taken to few 5 samples, detects the deviation of weight F of reinforcing bar by weight method
2;
Step 6: the deviation of weight F calculating reinforcing bar
1with practice examining deviation of weight F
2difference A, by the deviation of weight F of primary Calculation reinforcing bar
1with the deviation of weight F detecting reinforcing bar
2compare, the difference A of Reinforcing Steel Bar Calculation deviation of weight and actual sense weight deviation can be drawn, i.e. A=F
1-F
2;
Step 7: correction factor
determination, through repeatedly repeated examinations test, namely repeat step 4 ~ 6, multiple A value can be obtained, get the mean value of multiple A value
as correction factor;
Step 8: finally obtaining the relational expression that reinforcing bar deviation of weight and hot-rolled reinforced bar roll rear total length is:
F=[（W
0-W
1-W
2）/（L×M）-1]×100%＋
；
Step 9: the deviation of weight desired value of the hot-rolled reinforced bar preset is substituted into the relational expression in step 8, can obtain corresponding hot-rolled reinforced bar and roll rear total length desired value;
Step 10: hot-rolled reinforced bar is rolled rear total length and be adjusted to desired value, rolls rear deviation of weight requirement with what meet hot-rolled reinforced bar.
Theoretically, the strand of certain substance, is rolled into the reinforcing bar of certain specification, and the total length rolling rear reinforcing bar should be definitely.In actual production process, because the substance of strand can produce fluctuation, strand heated oxide scaling loss have deviation, the sectional dimension of rolling concrete steel bar also has fluctuation, and namely deviation of weight produces fluctuation, therefore rolls that the total length of rear reinforcing bar is also corresponding to change.Generally, by the adjustment of conticaster, the substance change of strand is relatively very little, can be controlled within 3 ‰, therefore can be similar to and think that the substance of strand is stablized constant.In addition, under stable as-rolled condition, the heated condition of strand is substantially constant, and namely oxidization burning loss is also substantially identical.So, just there is directly related relation with steel area size and deviation of weight in the total length rolling rear reinforcing bar.
National regulations, the deviation of weight computing formula of reinforcing bar is formula (1), and regulation sample should intercept from different root reinforcing bar simultaneously, and quantity is no less than 5, often props up specimen length and is not less than 500mm.Length by a measurement, need should be accurate to 1mm.When measuring sample gross weight, should be accurate to and be not more than 1% of gross weight.
--formula (1).
When sampling amount is enough large, the whole reinforcing bar being about to shut out all detects as sample, above formula (1) can be converted to formula (2), thus, can set up reinforcing bar deviation of weight and the dependency relation formula of rolling rear reinforcing bar total length:
--formula (2).
Reinforcing bar actual gross weight deducts oxidization burning loss and process by strand substance and cuts damage and obtain in formula (2), and theoretical weight is the datum that standard specifies, reinforcing bar total length detects by electrical equipment and shows in real time.Therefore, the relation of reinforcing bar deviation of weight and total length can be set up and mutually solve, roll rear length by the reinforcing bar observing display in real time and just can calculate corresponding reinforcing bar deviation of weight, roll rear length with regard to adjustable reinforcing bar deviation of weight by adjustment reinforcing bar, reach and monitor in real time and adjust the object of reinforcing bar deviation of weight.
Method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar provided by the invention, workable, be simple and easy to grasp, by monitoring and stablizing the substance of strand, tracking different size hot rolled ribbed bars rolls the deviation of weight corresponding to rear total length, utilize the hot rolled ribbed bars of online display in real time to roll rear total length, the deviation of weight of hot rolled ribbed bars can be calculated, thus reach directly perceived and the effect of monitoring in real time.Traditional sampling is weighed and is detected only as the means that a kind of selective examination and comparison confirm, thus greatly reduces the sampling frequency and quantity, reduces the labour intensity of workman.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
The HRB400E hot rolled ribbed bars of rolling nominal diameter 16mm, it rolls by hot-rolled reinforced bar the method that rear total length controls deviation of weight, comprises the following steps:
1. single strand weight W
0calculating: according to the target control size of single strand and the solid density of strand, calculate single strand theoretical weight; To a large amount of strand weigh weighing results statistics after, draw single strand actual weight W
0, when single strand actual weight and theoretical weight differ by more than 3 ‰, can adjust strand length, until strand actual weight differs with theoretical weight be no more than 3 ‰.
Raw material list props up strand and is of a size of 150 × 149 × 12000mm, and the density of strand is 7.8kg/m
3, theoretical single strand weight W
0=1.5 × 1.5 × 120 × 7.8=2092kg.To weigh weighing results according to repeatedly strand again, show that the actual substance of strand is 2090kg, differ with theory calculate weight and be: (2090-2092)/2092=0.96 ‰, meet actual weight and theoretical weight is more or less the same in the condition of 3 ‰.
According to the corresponding relation between the size of heating furnace and the theoretical size of single strand, so substance W under determining the condition that strand length dimension sets by 12m
0=2092kg.
Because the cross dimensions of strand and length dimension are all on fluctuation ground, and the density of strand is also along with the change that do not coexist of pulling rate, therefore carry out selective examination of weighing at any time in process of production, when find strand substance exceed ± 3 ‰ scope time, the length adjustment of subsequent production strand will be carried out in time.After strand is produced, eave tile can be utilized to weigh, or the electronic scale of strand weight is monitored in configuration specially before heating furnace at once.Supposing weighs to former the strands produced exceeds standard, and notifies continuous casting adjustment immediately, can ensure that the strand of subsequent production is in claimed range.In order to ensure single strand weight W
0stable, maintenance to be made regular check on to continuous casting square billet Length-fixing cutting dolly and relevant device, ensure that cut lengths errors is within ± 20mm, and the adjustment of weighed by strand weight selective examination and Length-fixing cutting length, control the weight of continuous casting square billet to be stabilized in ± 3 ‰ scopes in, for steel rolling provides single strand weight W
0stable square billet.
2. single strand oxidization burning loss W
1: according to HRB400E heating cycle, in conjunction with the heating cycle of heating furnace actual operating state and square billet, single strand oxidization burning loss W
1for single strand weight W
01.0%, W
1=W
0× 1%=2092 × 1%=20.9kg.
3. single the strand operation of rolling is cut and is damaged W
2: the situation that comes into operation of cutting according to crop end in each specification reinforcing bar operation of rolling and sheared length, determine that the process of different size reinforcing bar rolling cuts damage amount W
2.According to rolling specs and slab quality, general W
2for single strand weight W
00.6 ~ 1.8%.
Rolling the crop amount that card section cuts during setting is thick is 20mm, and the crop amount that finish rolling card section is cut is 500mm, back-end crop amount is 500mm.Collect cutting head cutting tail amount during 20 strand rollings, weighing results is 440kg, therefore show that the operation of rolling is cut and damages W
2=440/20=22kg.Therefore can calculating single strand, to cut loss rate be 22/2092=1.05%, and namely single the strand operation of rolling is cut and damaged W
2=W
0× 1.05%=2092 × 1.05%=22kg.
4. calculate the deviation of weight F of reinforcing bar
1: the theory every meter weight M being found different size reinforcing bar by national standard, is obtained hot-rolled reinforced bar by online display in real time and rolls rear total length L, then by W
0, W
1, W
2substitute into relational expression, obtain: F
1=[(W
0-W
1-W
2)/(L × M)-1] × 100%.
According to table 2 in GB1499.2-2007, the theory every meter weight M that can find each size hot-rolled ribbed rebar is as follows:
。
Finding the theoretical every meter of weight M of 16mm hot rolled ribbed bars according to GB1499.2-2007 is 1.58kg/m, and after the rolling of the online strand of display in real time, reinforcing bar rolls rear total length L is 1340m, calculates the deviation of weight of reinforcing bar:
F
1=[（W
0-W
1-W
2）/（L×M）-1]×100%=[（W
0-W
0×1%-W
0×1.05%）/（L×M）-1]×100%
=[0.9795W
0/（L×M）-1]×100%=[（0.9795×2092）/（1340×1.58）-1]×100%=-3.31%。
5. practice examining deviation of weight F
2: the reinforcing bar different parts after single strand rolling is taken to few 5 samples (sampling number is more, and it is more accurate to detect), detects the deviation of weight F of reinforcing bar by weight method
2.
After this strand rolls, the different parts of reinforcing bar gets 10, the sample of 1m length respectively, and weighing up sample gross weight is 15.2kg, therefore can draw inspection deviation of weight: F
2=[15.2/(10 × 1.58)-1] × 100%=-3.80%.
6. calculate the deviation of weight F of reinforcing bar
1with practice examining deviation of weight F
2difference A: will the deviation of weight F of reinforcing bar be calculated
1with practice examining deviation of weight F
2compare, the difference A of Reinforcing Steel Bar Calculation deviation of weight and actual sense weight deviation can be drawn, i.e. A=F
1-F
2=F
1-F
2=-3.31-(-3.80)=0.49%.
7. correction factor
determination: through repeatedly repeated examinations test, namely repeat step 4 ~ 6, multiple A value can be obtained, get the mean value of multiple A value
as correction factor.
Repeat step 4 ~ 6 five ten time, 50 A values can be obtained, calculate the mean value of 50 A values:
=0.26%.
8. finally obtaining 16mm specification HRB400E hot rolled ribbed bars deviation of weight with the relational expression of rolling rear length is:
F=[（W
0-W
1-W
2）/（L×M）-1]×100%＋
=[（2047.1/1.58L）-1]×100%＋（-0.26%）
Introduce correction factor
object be exactly eliminate to calculate the deviation of weight F of reinforcing bar
1with practice examining deviation of weight F
2deviation, according to comparing result, F
1compare F
2large 0.26%, therefore to subtract 0.26%.
Hot-rolled reinforced bar rolls the actual total length of rear total length and single the later reinforcing bar on-line real-time measuremen of strand hot rolling.
9. the deviation of weight desired value of the hot-rolled reinforced bar preset is substituted into the relational expression in step 8, corresponding hot-rolled reinforced bar can be obtained and roll rear total length desired value.
According to the inner quality standard of enterprise, the deviation of weight of reinforcing bar is set with desired value, and enterprise can be as far as possible close to lower limit according to self control ability.Set desired value as-4.5%, F=-4.5% is substituted into above relational expression, obtain hot-rolled reinforced bar and roll rear total length desired value: L=2047.1/ [1.58 × (-0.045+0.0026+1)]=1353m.
10. hot-rolled reinforced bar is rolled rear total length and be adjusted to desired value, roll rear deviation of weight requirement with what meet hot-rolled reinforced bar.When hot-rolled reinforced bar roll rear total length exceed the control range of desired value length time, carry out corresponding rewinding or blowing adjustment, namely increase or reduce hot-rolled reinforced bar roll rear length, until hot-rolled reinforced bar rolls rear total length regressive object scope.
In general, for the hot-rolled reinforced bar of all specifications, according to practical condition, different desired value length variations scopes can be determined, as exceed during rolling 12mm specification reinforcing bar 0.2% of target length just need adjustment, and exceed during rolling 32mm specification reinforcing bar 1.5% of target length need adjustment.
Rolling operation work adjustment material molded dimension, progressively rolls rear total length desired value and adjusts to about 1353m by hot-rolled reinforced bar.Notice that the every root reinforcing bar observing online display in real time rolls rear length simultaneously, when length is at desired value ± 0.3%, i.e., within the scope of 1353 × 0.3%=± 4.1m during fluctuation, can adjust.When fluctuation range exceed ± 4.1m time carry out corresponding rewinding or blowing adjustment, just can ensure reinforcing bar deviation of weight fluctuate within ± 0.3%.
embodiment 2
The HPB300 hot calendering round bar of rolling nominal diameter 20mm, it rolls by hot-rolled reinforced bar the method that rear total length controls deviation of weight, comprises the following steps:
1. single strand weight W
0calculating: according to the target control size of single strand and the solid density of strand, calculate single strand theoretical weight; To a large amount of strand weigh weighing results statistics after, draw single strand actual weight W
0, when single strand actual weight and theoretical weight differ by more than 3 ‰, can adjust the length of subsequent production strand, until strand actual weight differs with theoretical weight be no more than 3 ‰.
Raw material strand is of a size of 150 × 149 × 12000mm, and the density of strand is 7.8kg/m
3, theoretical single strand weight W
0=1.5 × 1.49 × 120 × 7.8=2092kg.
To weigh weighing results according to repeatedly strand again, show that the actual substance of strand is 2085kg, differ with theory calculate weight and be: (2085-2092)/2092=-3.35 ‰, be discontented with sufficient actual weight and theoretical weight is more or less the same in the condition of 3 ‰.The length adjustment of subsequent production strand should be carried out in time, so suitably increase subsequent production strand length.Under final Cutting Length presses the condition of 12.08m setting, weigh statistics of weighing of strand substance is 2091kg, reaches condition.
Because the cross dimensions of strand and length dimension are all on fluctuation ground, and the density of strand is also along with the change that do not coexist of pulling rate, therefore carries out selective examination of weighing at any time in process of production, when discovery strand substance exceed ± 3 ‰ scope time, adjust in time.After strand is produced, eave tile can be utilized to weigh, or the electronic scale of strand weight is monitored in configuration specially before heating furnace at once.Supposing weighs to former the strands produced exceeds standard, and notifies continuous casting adjustment immediately, can ensure that the strand of subsequent production is in claimed range.In order to ensure single strand weight W
0stable, maintenance to be made regular check on to continuous casting square billet Length-fixing cutting dolly and relevant device, ensure that cut lengths errors is within ± 20mm, and the adjustment of weighed by strand weight selective examination and Length-fixing cutting length, control the weight of continuous casting square billet to be stabilized in ± 3 ‰ scopes in, for steel rolling provides single strand weight W
0stable square billet.
2. single strand oxidization burning loss W
1: according to HPB300 heating cycle, in conjunction with the heating cycle of heating furnace actual operating state and square billet, single strand oxidization burning loss W
1for single strand weight W
00.9%, W
1=W
0× 0.9%=2092 × 0.9%=18.8kg.
3. single the strand operation of rolling is cut and is damaged W
2: the situation that comes into operation of cutting according to crop end in each specification reinforcing bar operation of rolling and sheared length, determine that the process of different size reinforcing bar rolling cuts damage amount W
2.According to rolling specs and slab quality, general W
2for single strand weight W
00.6 ~ 1.8%.
Rolling the crop amount that card section cuts during setting is thick is 20mm, and the crop amount that finish rolling card section is cut is 400mm, back-end crop amount is 400mm.Collect cutting head cutting tail amount during 20 strand rollings, weighing results is 416kg, therefore show that the operation of rolling is cut and damages W
2=416/20=20.8kg.
Therefore can calculating single strand, to cut loss rate be 20.8/2092=0.99%, and namely single the strand operation of rolling is cut and damaged W
2=W
0× 0.99%=2092 × 0.99%=20.8kg.
4. the deviation of weight F of primary Calculation reinforcing bar
1: the theory every meter weight M being found different size reinforcing bar by national standard, is obtained hot-rolled reinforced bar by online display in real time and rolls rear total length L, then by W
0, W
1, W
2substitute into relational expression, obtain: F
1=[(W
0-W
1-W
2)/(L × M)-1] × 100%.
According to table 2 in GB1499.1-2008, the theory every meter weight M that can find each size hot-rolled ribbed rebar is as follows:
。
Finding the theoretical every meter of weight M of 20mm hot rolled ribbed bars according to GB1499.1-2008 is 2.47kg/m, and after the rolling of the online strand of display in real time, reinforcing bar rolls rear total length L is 870m, calculates the deviation of weight of reinforcing bar:
F
1=[（W
0-W
1-W
2）/（L×M）-1]×100%=[（W
0-W
0×0.9%-W
0×0.99%）/（L×M）-1]×100%
=[0.9811W
0/（L×M）-1]×100%=[（0.9811×2092）/（870×2.47）-1]×100%=-4.49%。
5. practice examining deviation of weight F
2: the reinforcing bar different parts after single strand rolling is taken to few 5 samples (sampling number is more, and it is more accurate to detect), detects the deviation of weight F of reinforcing bar by weight method
2.
After this strand rolls, the different parts of reinforcing bar gets 10, the sample of 1m length respectively, and weighing up sample gross weight is 23.7kg, therefore can draw inspection deviation of weight: F
2=[23.7/(10 × 2.47)-1] × 100%=-4.05%.
6. calculate the deviation of weight F of reinforcing bar
1with practice examining deviation of weight F
2difference A: will the deviation of weight F of reinforcing bar be calculated
1with practice examining deviation of weight F
2compare, the difference A of Reinforcing Steel Bar Calculation deviation of weight and actual sense weight deviation can be drawn, i.e. A=F
1-F
2=F
1-F
2=-4.49-(-4.05)=0.44%.
7. correction factor
determination: through repeatedly repeated examinations test, namely repeat step 4 ~ 6, multiple A value can be obtained, get the mean value of multiple A value
as correction factor.
Repeat step 4 ~ 6 five ten time, 50 A values can be obtained, calculate the mean value of 50 A values:
be 0.31%.
8. finally obtaining 20mm specification HPB300 hot calendering round bar deviation of weight with the relational expression of rolling rear length is:
F=[（W
0-W
1-W
2）/（L×M）-1]×100%＋
=[（2052.5/2.47L）-1]×100%＋（-0.31%）。
Introduce correction factor
object be exactly eliminate to calculate the deviation of weight F of reinforcing bar
1with practice examining deviation of weight F
2deviation, according to comparing result, F
1compare F
2large 0.31%, therefore to subtract 0.31%.
Hot-rolled reinforced bar rolls the actual total length of rear total length and single the later reinforcing bar on-line real-time measuremen of strand hot rolling.
9. the deviation of weight desired value of the hot-rolled reinforced bar preset is substituted into the relational expression in step 8, corresponding hot-rolled reinforced bar can be obtained and roll rear total length desired value.
According to the inner quality standard of enterprise, the deviation of weight of reinforcing bar is set with desired value, and enterprise can be as far as possible close to lower limit according to self control ability.Set desired value as-4.5%, F=-4.5% is substituted into above relational expression, obtain hot-rolled reinforced bar and roll rear total length desired value: L=2052.5/ [2.47 × (-0.045+0.0031+1)]=867.3m.
10. hot-rolled reinforced bar is rolled rear total length and be adjusted to desired value, roll rear deviation of weight requirement with what meet hot-rolled reinforced bar; When hot-rolled reinforced bar roll rear total length exceed the control range of desired value length time, carry out corresponding rewinding or blowing adjustment, namely increase or reduce hot-rolled reinforced bar roll rear length, until hot-rolled reinforced bar rolls rear total length regressive object scope.
Rolling operation work adjustment material molded dimension, progressively rolls rear length desired value and adjusts to about 867.3m by hot-rolled reinforced bar.Notice that the every root reinforcing bar observing online display in real time rolls rear length simultaneously, when length is at desired value ± 0.5%, i.e., within the scope of 867.3 × 0.5%=± 4.3m during fluctuation, can adjust.When fluctuation range exceed ± 4.3m time carry out corresponding rewinding or blowing adjustment, just can ensure reinforcing bar deviation of weight fluctuate within ± 0.3%.
Claims (4)
1. one kind is rolled the method for rear cut to lengthen deviation of weight by hot-rolled reinforced bar, it is characterized in that, set up the deviation of weight of reinforcing bar and single strand theoretical weight, single strand oxidization burning loss, single strand operation of rolling cut damage, hot-rolled reinforced bar rolls numerical relation model between rear total length, the adjustment of rolling rear total length by hot-rolled reinforced bar realizes the control of deviation of weight, and the numerical relation model of described each parameter is:
F=[(W
0-W
1-W
2)/(L × M)-1] × 100%+
in formula: the deviation of weight of F-reinforcing bar, W
0-mono-strand theoretical weight, W
1-mono-strand oxidization burning loss, W
2-mono-the strand operation of rolling cuts damage, and L-hot-rolled reinforced bar rolls rear total length, the theory every meter weight of M-reinforcing bar,
-correction factor.
2. method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar according to claim 1, be is characterized in that, described list props up strand oxidization burning loss W
1for single strand theoretical weight W
00.8 ~ 1.2%.
3. method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar according to claim 1, be is characterized in that, described list props up the strand operation of rolling and cuts damage W
2for single strand theoretical weight W
00.8 ~ 1.6%.
4. method of being rolled rear cut to lengthen deviation of weight by hot-rolled reinforced bar according to claim 1, be is characterized in that, comprise the following steps:
Step 1: single strand theoretical weight W
0calculating, according to the target control size of single strand and the solid density of strand, calculate single strand theoretical weight;
Step 2: single strand oxidization burning loss W
1for single strand theoretical weight W
00.8 ~ 1.2%;
Step 3: single the strand operation of rolling is cut and damaged W
2, be single strand theoretical weight W
00.8 ~ 1.6%;
Step 4: the deviation of weight F calculating reinforcing bar
1, found the theory every meter weight M of different size reinforcing bar by national standard, obtain hot-rolled reinforced bar by online display in real time and roll rear total length L, then by W
0, W
1, W
2substitute into relational expression, obtain: F
1=[(W
0-W
1-W
2)/(L × M)-1] × 100%;
Step 5: practice examining deviation of weight F
2, the reinforcing bar different parts after single strand rolling is taken to few 5 samples, detects the deviation of weight F of reinforcing bar by weight method
2;
Step 6: the deviation of weight F calculating reinforcing bar
1with practice examining deviation of weight F
2difference A, by the deviation of weight F of primary Calculation reinforcing bar
1with the deviation of weight F detecting reinforcing bar
2compare, the difference A of Reinforcing Steel Bar Calculation deviation of weight and actual sense weight deviation can be drawn, i.e. A=F
1-F
2;
Step 7: correction factor
determination, through repeatedly repeated examinations test, namely repeat step 4 ~ 6, multiple A value can be obtained, get the mean value of multiple A value
as correction factor;
Step 8: finally obtaining the relational expression that reinforcing bar deviation of weight and hot-rolled reinforced bar roll rear total length is:
F=[（W
0-W
1-W
2）/（L×M）-1]×100%＋
Step 9: the deviation of weight desired value of the hot-rolled reinforced bar preset is substituted into the relational expression in step 8, can obtain corresponding hot-rolled reinforced bar and roll rear total length desired value;
Step 10: hot-rolled reinforced bar is rolled rear total length and be adjusted to desired value, rolls rear deviation of weight requirement with what meet hot-rolled reinforced bar.
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| CN108126988B (en) * | 2017-12-13 | 2019-08-23 | 中冶京诚工程技术有限公司 | Bar negative deviation on-line measuring method and system |
| CN112139240B (en) * | 2020-08-11 | 2023-04-07 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
| CN112207129A (en) * | 2020-09-30 | 2021-01-12 | 盐城市联鑫钢铁有限公司 | Detection control method for out-of-roundness of base circle of hot-rolled ribbed steel bar |
| CN114042764B (en) * | 2021-11-16 | 2024-05-07 | 重庆钢铁股份有限公司 | Hot rolling production line yield prediction method and system |
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