An intelligent control method for finished bar size

Abstract

The present invention relates to the technical field of finished bar product control technology, and more particularly to a method for intelligently controlling the dimensions of finished bar products. The method comprises comparing the actual length of the finished bar product with its theoretical length, thereby calculating whether the finished bar product has been reduced or increased in size after passing through a rolling mill, and comparing the target diameter of the finished bar product after the increase or decrease in size with the maximum or minimum deviation of the finished bar product's diameter, thereby calculating the increased or decreased dimension of the rolling mill height preceding the finished bar product. The present invention addresses the problem of uneven enlargement of finished bar product size due to roller wear in existing production processes, and the lack of a method for controlling the finished bar product length by aligning the finished bar product size with the finished bar product during rolling.

Description

Technical Field

[0001] The present invention relates to the technical field of finished bar product control, and in particular to a method for intelligently controlling the size of finished bar products. Background Art

[0002] For spring steel and other rolled products requiring full, fixed-length delivery, roller wear during production can lead to uneven finished product size. Currently, adjustments are determined based on the remaining length of the finished product after shearing. However, the amount of adjustment is uncontrollable, relying solely on manual experience to determine the shape of the material, resulting in long and unstable adjustments. Summary of the Invention

[0003] Aiming at the shortcomings of the existing methods, the present invention solves the problem that the finished product size becomes uneven due to roller wear in the existing production process, and there is a lack of a method to control the finished product length by adjusting the finished product size during the rolling process.

[0004] The technical solution adopted by the present invention is: a method for intelligently controlling the size of finished bar products comprises the following steps:

[0005] Step 1: Set the target diameter D of the finished bar, the section S of the blank, the length L1 of the finished bar, the length L2 of the cut head and tail, and the maximum diameter deviation Δd of the finished bar. max and minimum value Δd min , material shape B 0. Width of rolled piece before rolling H 0. Average height of rolled piece after rolling h ;

[0006] Step 2: Calculate the number of finished product lengths n;

[0007] Furthermore, the formula for the number of finished product lengths is:

[0008] n= S / (D 2 π / 4) / L1

[0009] Among them, S is the cross section of the blank, and D is the target diameter of the finished product.

[0010] Step 3: Calculate the theoretical length L of the finished rolled product 理 and the average contact arc length L between the rolled material and the roller c ;

[0011] Furthermore, the formula for the theoretical length of the finished rolled product is:

[0012] L 理 =n L1+L2

[0013] Among them, n is the number of finished product lengths, L1 is the finished product length, and L2 is the length of the cut ends.

[0014] Furthermore, the formula for the average contact arc length between the rolled material and the roller is:

[0015] L c =

[0016] in, D 辊 is the diameter of the finished roll, H 0 is the width of the rolled piece before rolling, h is the average height of the rolled piece after rolling.

[0017] Step 4: Calculate the width expansion coefficient β of the finished rolled piece after rolling;

[0018] Furthermore, the formula for the width expansion coefficient of the finished rolled piece after rolling is:

[0019] β=1+0.8[2L c / ( H 0+2 B 0)][( H 0- h ) / H 0]

[0020] Among them, L c is the average contact arc length between the rolled material and the roller, B 0 is the material shape, H 0 is the width of the rolled piece before rolling, h is the average height of the rolled piece after rolling.

[0021] Step 5: Calculate the actual length L of the finished rolled product 实 ; And based on the calculated ratio coefficient δ between the theoretical length and the actual length of the finished rolled product;

[0022] Furthermore, the formula for the actual length of the finished rolled product is:

[0023] L 实 = (L / t2) t1

[0024] Among them, L is the distance between the two detection signal points, t2 is the time it takes for the finished rolled product to pass through the two detection signal points, and t1 is the pure rolling time of the rolled product.

[0025] Furthermore, the formula for the ratio coefficient between the theoretical length and the actual length of the finished rolled product is:

[0026] δ={(L 理 ) / L 实} 1 / 2

[0027] Among them, L 理 L is the theoretical length of the finished rolled product. 实 The actual length of the finished rolled product.

[0028] Step 6. Compare the actual length of the finished product with the theoretical length of the finished product; thereby calculate whether the size of the finished product is reduced or increased after passing through the rolling mill; compare the target diameter of the finished product specification after the size is increased or decreased with the maximum or minimum value of the diameter deviation of the finished product, thereby calculate the enlarged or reduced size of the height of the rolling mill before the finished product.

[0029] Furthermore, when the actual length of the finished rolled product L 实 Theoretical length L of finished rolled product 理 When the lengths are equal, the actual length of the finished product L 实 The requirements are met and there is no need to adjust the rolling mill material shape to control the outer diameter D of the finished product.

[0030] Furthermore, the size of the finished product after passing through the rolling mill is calculated to be reduced or increased; the target diameter of the finished product after the increase or decrease is compared with the diameter deviation value of the finished product, thereby calculating the reduction or increase in size of the rolling mill before the finished product is rolled. Specifically, the following steps are included:

[0031] Determine the actual length L of the finished rolled product 实 Is it greater than the theoretical length L of the finished rolled product? 理 +L1 / 2, if yes, calculate the mill reduction size as Δd1=D (1-δ);

[0032] Determine whether D-Δd1 is greater than |D+Δd min If yes, the mill size reduction value is Δd1, and the height reduction of the mill material before the finished product is calculated as Δh=Δd1 β;

[0033] Determine whether D-Δd1 is greater than |D+Δd min |, if not, then the mill size enlargement value is Δd max Calculate the height enlargement dimension of the material shape of the rolling mill before the finished product Δh=Δd max +Δd max |1-β|.

[0034] Furthermore, the method further includes calculating whether the size of the finished product is reduced or increased after passing through the rolling mill; comparing the target diameter of the finished product after the increase or decrease in size with the diameter deviation value of the finished product, thereby calculating the reduced or increased size of the rolling mill before the finished product is rolled.

[0035] Determine the actual length L of the finished rolled product 实 Is it greater than the theoretical length L of the finished rolled product? 理+L1 / 2, if not, calculate the enlarged size of the rolling mill as Δd1=D (δ-1);

[0036] Determine whether D+Δd1 is greater than |D+Δd max |, if yes, then the mill size enlargement value is Δd max Calculate the height enlargement dimension of the material shape of the rolling mill before the finished product Δh=Δd max +Δd max |1-β|;

[0037] Determine whether D+Δd1 is greater than |D+Δd max |, if not, then the size magnification value of the rolling mill is Δd1, and the height magnification of the material shape of the rolling mill before the finished product is calculated as Δh=Δd1+Δd1|1-β|.

[0038] Beneficial effects of the present invention:

[0039] 1. The present invention effectively reduces non-standard length waste, improves product yield rate and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of the method for intelligently controlling the finished bar size of the present invention;

[0041] Figure 2 It is a schematic diagram of the rolled material passing through two detection signal points of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0043] like Figure 1 As shown, a method for intelligently controlling the size of finished bar products includes the following steps:

[0044] Example 1

[0045] When producing bearing steel 60Si2MnA, the target diameter of the finished product is D=50mm, the fixed length of the finished product is L1=6000mm, the length of the cut head and tail is L2=1500mm, and the maximum and minimum diameter deviations of the finished bar are Δd. max =0.5mm and Δd min =-0.5mm, blank section S=220 260 10000mm, finished roll diameter D 辊 =380mm, material shape B0=43mm, width of rolled piece before rolling H 0=74mm, average height of rolled piece after rollingh =50mm.

[0046] Finished product length count n= 220 260 10000 / (50 2 π / 4) / 6000 =48.5, n is 48; calculate the theoretical length L of the finished rolled product 理 =n L1+L2=289500mm, average contact arc length between rolled material and roller =(380 (74-50) 1 / 2 =19.5;

[0047] The expansion coefficient of the rolled piece after rolling is β=1+0.8[2L c / (H0+2B0)][(H0-h) / H0]=1+0.8[2 19.5 / (74+2 43)][(74-50) / 74]=1+0.8 0.244 0.324=1.06;

[0048] like Figure 2 The distance between the two detection signals, namely detection 1 and detection 2, is L=60m. The time t2=20s for the rolled material to pass through these two detection points. The pure rolling time of the rolled material is the pulse time when the motor current value of the last rolling mill exceeds 200A. The pure rolling time of the rolled material is t1=98.1s. The actual length L of the finished rolled material is calculated. 实 =(60 / 20) 98.1=294.3m;

[0049] L 实 >L 理 +L1 / 2, the ratio coefficient of the theoretical length of the finished rolled product to the actual length δ={(L 理 ) / L 实} 1 / 2 ={289.5 / 294.3} 1 / 2 =0.992, calculate the finished mill size reduction Δd1=50 (1-0.992) = 0.41mm and the rolling mill before the finished product adjusts the material height to reduce the size Δh = 0.41 1.06=0.43mm;

[0050] During the operation, the finished product stand was narrowed by 0.41mm, and the rolling mill before the finished product was narrowed by 0.43mm.

[0051] Implementation Case 2

[0052] In the production of bearing steel 60Si2MnA, the target diameter of the finished product is D = 50mm, the fixed length of the finished bar is L1 = 6000mm, the length of the finished bar after cutting is L2 = 1500mm, and the maximum and minimum diameter deviations of the finished bar are Δd. max =0.5mm and Δd min =-0.5mm, blank section S=220 260 10000mm, finished roll diameter D 辊 =380mm, material shape B0=43mm, width of rolled piece before rolling H 0=74mm, average height of rolled piece after rolling h =50mm.

[0053] Finished product length count n= S / (D 2 π / 4) = 220 260 10000 / (50 2 π / 4) / 6000 =48.5, n is rounded down to 48; L 理 =nL1+L2=289500mm, L c =(380(74-50)) 1 / 2 =19.5;

[0054] The expansion coefficient of the rolled piece after rolling is β=1+0.8[2 19.5 / (74+2 43)][(74-50) / 74]=1+0.8 0.244 0.324=1.06.

[0055] The distance between the two detection signal points is L = 60m, and the time t2 of the rolled material passing through the two detection points is 20s; the pure rolling time of the rolled material is the pulse time when the motor current value of the last rolling mill exceeds 200A, and the pure rolling time of the rolled material is t1 = 97.1s. Calculate the actual length L of the finished rolled material. 实 =(60 / 20) 97.1=291.3m;

[0056] L 实 <L 理 +L1 / 2,δ={(L 理 ) / L 实} 1 / 2 ={289.5 / 291.3} 1 / 2 =0.9969

[0057] Δd1=50 (0.9969-1)=-0.155mm; Δh=-0.155-0.155 |1-1.06|=-0.1643mm;

[0058] When the finished product rack is unloading, the material collection is a positive number, and the material discharge is a negative number, that is, when the finished product rack is unloading, the material is discharged by 0.155mm, and the rolling mill before the finished product is unloading by 0.1643mm.

[0059] Example 3

[0060] In the production of bearing steel 60Si2MnA, the target diameter of the finished product is D = 50mm, the fixed length of the finished bar is L1 = 12000mm, the length of the finished bar after cutting is L2 = 1500mm, and the maximum and minimum diameter deviations of the finished bar are Δd. max =0.5mm and Δd min =-0.5mm, blank section S=220 260 10000mm, finished roll diameter D 辊 =380mm, material shape B0=43mm, width of rolled piece before rolling H 0=74mm, average height of rolled piece after rolling h =50mm.

[0061] Finished product length count n= S / (D 2 π / 4) = 220 260 10000 / (50 2 π / 4) / 12000 =24.25, n is rounded down to 24; L 理 =nL1+L2=289500mm, L c =(380(74-50)) 1 / 2 =19.5;

[0062] The expansion coefficient of the rolled piece after rolling is β=1+0.8[2 19.5 / (74+2 43)][(74-50) / 74]=1+0.8 0.244 0.324=1.06.

[0063] The distance between the two detection signal points is L = 60m, and the time t2 of the rolled material passing through the two detection points is 20s; the pure rolling time of the rolled material is the pulse time when the motor current value of the last rolling mill exceeds 200A, and the pure rolling time of the rolled material is t1 = 97.8s. Calculate the actual length L of the finished rolled material. 实 =(60 / 20) 99=297m;

[0064] L 实 >L 理 +L1 / 2,δ={(L 理 ) / L 实} 1 / 2 ={289.5 / 297} 1 / 2 =0.9873;

[0065] Δd1=50 (1-0.9883) = 0.585mm exceeds the upper tolerance value, so adjust to the limit value Δd max =0.5mm; Δh=0.5+0.5 |1.06-1|=0.53mm;

[0066] The finished product stand is unloaded by 0.5mm, and the rolling mill before the finished product is unloaded by 0.53mm.

[0067] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An intelligent control method for finished bar size, characterized in that: The following steps are involved: Step 1: Set the target diameter D of the finished bar, the section S of the blank, the length L1 of the finished bar, the length L2 of the cut head and tail, and the maximum diameter deviation Δd of the finished bar. max and minimum value Δd min , material shape B 0. Width of rolled piece before rolling H 0. Average height of rolled piece after rolling h ; Step 2: Calculate the number of finished product lengths n; Step 3: Calculate the theoretical length L of the finished rolled product 理 and the average contact arc length L between the rolled material and the roller c ; Step 4: Calculate the width expansion coefficient β of the finished rolled piece after rolling; Step 5: Calculate the actual length L of the finished rolled product 实 ; and calculate the ratio coefficient δ between the theoretical length and the actual length of the finished rolled product; Step 6. Compare the actual length of the finished product with the theoretical length of the finished product; thereby calculate whether the size of the finished product is reduced or increased after passing through the rolling mill; compare the target diameter of the finished product specification after the size is increased or decreased with the maximum or minimum value of the diameter deviation of the finished product, thereby calculate the enlarged or reduced size of the height of the rolling mill before the finished product.

2. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: The formula for calculating the number of finished product lengths n is: n= S / (D 2 π / 4) / L1 ; Among them, S is the cross section of the blank, D is the target diameter of the finished product specification, and L1 is the fixed length of the finished product specification.

3. The intelligent control method for finished bar size according to claim 1, characterized in that: The formula for the theoretical length of the finished rolled product is: L 理 =n L1+L2; Among them, n is the number of finished product lengths, L1 is the finished product length, and L2 is the length of the cut ends.

4. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: The formula for the average contact arc length between the rolled material and the roller is: L c = ； in, D 辊 is the diameter of the finished roll, H 0 is the width of the rolled piece before rolling, h is the average height of the rolled piece after rolling.

5. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: The formula for the width expansion coefficient of the finished rolled product after rolling is: β=1+0.8[2L c / ( H 0+2 B 0)][( H 0- h ) / H 0]； Among them, L c is the average contact arc length between the rolled material and the roller, B 0 is the material shape, H 0 is the width of the rolled piece before rolling, h is the average height of the rolled piece after rolling.

6. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: The formula for the actual length of the finished rolled product is: L 实 =(L / t2) t1; Among them, L is the distance between the two detection signal points, t2 is the time it takes for the finished rolled product to pass through the two detection signal points, and t1 is the pure rolling time of the rolled product.

7. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: The formula for the ratio coefficient between the theoretical length and the actual length of the finished rolled product is: δ={(L 理 ) / L 实 } 1 / 2 ; Among them, L 理 L is the theoretical length of the finished rolled product. 实 The actual length of the finished rolled product.

8. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: When the actual length of the finished rolled product L 实 Theoretical length L of finished rolled product 理 When the lengths are equal, the actual length of the finished product L 实 The requirements are met and there is no need to adjust the rolling mill material shape to control the outer diameter D of the finished product.

9. The method for intelligently controlling the finished bar size according to claim 1, characterized in that: Calculate the size of the finished product after it passes through the rolling mill; determine the target diameter of the finished product after the size is increased or decreased and compare it with the diameter deviation of the finished product, so as to calculate the size reduction or enlargement of the rolling mill before the finished product. Specifically include: Determine the actual length L of the finished rolled product 实 Is it greater than the theoretical length L of the finished rolled product? 理 +L1 / 2, if yes, calculate the mill reduction size as Δd1=D (1-δ); Determine whether D-Δd1 is greater than |D+Δd min If yes, the mill size reduction value is Δd1, and the height reduction of the mill material before the finished product is calculated as Δh=Δd1 β; Determine whether D-Δd1 is greater than |D+Δd min |, if not, then the mill size enlargement value is Δd max Calculate the height enlargement dimension of the material shape of the rolling mill before the finished product Δh=Δd max +Δd max |1-β|.

10. The intelligent control method for finished bar size according to claim 9, characterized in that: Calculate the size of the finished product after it passes through the rolling mill; determine the target diameter of the finished product after the size is increased or decreased and compare it with the diameter deviation of the finished product, so as to calculate the size reduction or enlargement of the finished product before the rolling mill. It also includes: Determine the actual length L of the finished rolled product 实 Is it greater than the theoretical length L of the finished rolled product? 理 +L1 / 2, if not, calculate the enlarged size of the rolling mill as Δd1=D (δ-1); Determine whether D+Δd1 is greater than |D+Δd max |, if yes, then the mill size enlargement value is Δd max Calculate the height enlargement dimension of the material shape of the rolling mill before the finished product Δh=Δd max +Δd max |1-β|; Determine whether D+Δd1 is greater than |D+Δd max |, if not, then the size magnification value of the rolling mill is Δd1, and the height magnification of the material shape of the rolling mill before the finished product is calculated as Δh=Δd1+Δd1|1-β|.

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