A method for calculating the width of rolled product during angle rolling of wide and heavy plate mill

Abstract

The present invention discloses a method for calculating the width of rolled pieces in the angle rolling process of a wide and thick plate rolling mill, which relates to the technical field of steel production. In response to the calculation requirements for the width of rolled pieces in the angle rolling process of a wide and thick plate rolling mill, the method divides the rolled pieces into regions and performs zone calculation to realize the calculation of the width of the angle rolling process.

Description

Technical Field

[0001] The present invention relates to the technical field of steel production, in particular to a method for calculating the width of a rolled piece during an angle rolling process of a wide and thick plate rolling mill. Background Art

[0002] The billets used in wide and heavy plate mills are generally continuous-cast billets. Billet width and thickness are relatively fixed due to the constraints of the continuous-casting machine equipment. Billet length can be determined based on the unit weight of the finished product. However, if the unit weight exceeds a certain limit, the billet length will exceed the mill equipment's limitations, making steel transfer and widening rolling impossible. If the target width of the finished product exceeds the billet width, production cannot proceed.

[0003] In view of this situation, angle rolling can be used for production, such as Figure 1 As shown, in the first pass, the workpiece is rotated a certain angle and bitten at an angle. After the first pass, the workpiece becomes a parallelogram. In the second pass, the workpiece is rotated in the opposite direction and bitten at an angle again. After the second pass, the workpiece becomes a rectangle again. After two passes of angle rolling, the workpiece reaches the target width.

[0004] During angle rolling, the width of the workpiece gradually changes due to the presence of the corners. Initially, the workpiece bites into the rolls at a point, but the contact with the rolls gradually becomes a surface area, which continues to change within a certain range. During tail casting, the contact with the rolls gradually changes from a surface area to a point. Width control is the most important process objective in angle rolling, so accurately calculating the workpiece width during angle rolling is crucial. Summary of the Invention

[0005] The present invention addresses the above technical problems, overcomes the shortcomings of the prior art, and provides a method for calculating the width of a rolled piece during the angle rolling process of a wide and thick plate rolling mill, comprising:

[0006] (1) Division of rolled product areas during angle rolling

[0007] Assume that the initial plane shape of the rolled piece is A0B0C0D0, the width is b0, the length is l0, and the angle rolling rotation angle is α. The rolled piece in the angle rolling process is divided into the triangular areas at the head and tail ends and the parallelogram area in the middle.

[0008] (2) Calculation of roller linear speed during angle rolling

[0009] The linear speed of the roller is calculated as follows:

[0010]

[0011] Where: v is the roller linear speed, m / s; R is the working roller radius, mm; n is the roller speed, r / min;

[0012] (3) Calculation of the width of the head triangle area

[0013] When the head triangle area is rolling, the steel bite starts at a point. As the part of the rolled piece entering the rolling mill increases, the width also begins to increase gradually until it reaches the maximum width position.

[0014] Assume that the width of this area at a certain moment is b 11 , the rolling length of the head triangle area is l 11 , the rolling time of the head triangle area is t 11 , according to the trigonometric function relationship, we have the following calculation formula:

[0015] l 11 =b0sinα ②

[0016]

[0017] When t≤t 11 When , the width of the rolled piece is calculated as follows:

[0018]

[0019] (4) Middle parallelogram area

[0020] During rolling, the width of the roller in this area when it contacts the workpiece is constant, and what changes is the position of the projection on the roller. Let the width of this area at a certain moment be b. 12 , the rolling length of the middle parallelogram is l 12 , the rolling time of the middle parallelogram is t 12 , according to the trigonometric function relationship, we have the following calculation formula:

[0021] l 12 =l0cosα-b0sinα⑤

[0022]

[0023] When t 11 <t<t 11+ t 12 When , the width of the rolled piece is calculated as follows:

[0024]

[0025] (5) Tail triangle area

[0026] Similar to the head triangle area, the difference is that the width of this area is decreasing, gradually decreasing from the maximum width value until the width drops to 0 when the steel is thrown, and the rolling process of this pass is completed.

[0027] Assume that the width of this area at a certain moment is b 13 , the rolling length of the tail triangle area is l13 , the rolling time of the tail triangle area is t 13 , according to the trigonometric function relationship, we have the following calculation formula:

[0028] l 13 =l 11 =b0sinα ⑧

[0029]

[0030] The total rolling time t1 for all three zones is calculated as follows:

[0031] t1=t 11 +t 12 +t 13 ⑩

[0032] When t 11 +t 12 When ≤t≤t1, the width of the rolled piece is calculated as follows:

[0033]

[0034] The beneficial effect of this invention is that it can calculate the width of the rolled product during the angle rolling process of a wide and heavy plate mill by dividing the rolled product into regions and performing zone calculations. Adopting this angle rolling method can increase the width of the rolled product, increase annual production by 36,000 tons, and generate annual profits of 15.12 million yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the angle rolling process of a wide and heavy plate mill;

[0036] Figure 2 This is a schematic diagram of the area division of the workpiece during angle rolling;

[0037] Figure 3 This is a schematic diagram of the triangle area at the head during the angle rolling process;

[0038] Figure 4 It is a schematic diagram of the parallelogram area in the middle of the angle rolling process;

[0039] Figure 5 Schematic diagram of the tail triangle area during the angle rolling process.

[0040] Figure 6 This is the width change diagram during the angle rolling process. DETAILED DESCRIPTION

[0041] This embodiment provides a method for calculating the width of a rolled piece during an angle rolling process of a wide and thick plate rolling mill, comprising:

[0042] (1) Division of rolled product areas during angle rolling

[0043] The width b0 of the rolled piece is 2770 mm, the length l0 is 5000 mm, and the angle of rotation is 30°. The rolled piece in the angle rolling process is divided into two triangular regions at the head and tail ends and a parallelogram region in the middle.

[0044] (2) Calculation of roller linear speed during angle rolling

[0045] The working roll radius of the rolling mill is R = 580 mm, the roll speed is n = 30 r / min, and the linear speed of the roll is calculated according to formula (1):

[0046]

[0047] (3) Calculation of the width of the head triangle area

[0048] According to formula (2), the rolling length of the head triangle area is calculated:

[0049] l 11 =b0sinα=2770×sin30°=1385mm;

[0050] According to formula (3), the rolling time of the head triangle area is calculated:

[0051]

[0052] When t≤0.7605s, according to formula (4), the width of the rolled piece is calculated as follows:

[0053]

[0054] When t=0.7605s, it is calculated.

[0055] (4) Middle parallelogram area

[0056] According to formula (5), the rolling length of the middle parallelogram is calculated:

[0057] l 12 =l0cosα-b0sinα=5000×cos30°-2770×sin30°=2945mm;

[0058] According to formula (6), the rolling time of the middle parallelogram is calculated:

[0059]

[0060] When 0.7605s<t<2.3775s, the width of the rolled piece is calculated according to formula (7):

[0061]

[0062] (5) Tail triangle area

[0063] The rolling length of the tail triangle area is calculated according to formula (8):

[0064] l 13 =l 11 =b0sinα=1385mm;

[0065] The rolling time of the tail triangle area is calculated according to formula (9):

[0066]

[0067] The total rolling time of all three zones is calculated according to formula (10):

[0068] t1=t 11 +t 12 +t 13 =0.7605+1.617+0.7605=3.138s;

[0069] When 2.3775s≤t≤3.138s, the width of the rolled piece is calculated according to formula (11):

[0070]

[0071] When t = 2.3775, b 13 =3198.6mm;

[0072] When t = 3.137, b 13 =0mm.

[0073] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A method for calculating the width of a rolled piece during the angle rolling process of a wide and heavy plate rolling mill, characterized by: include: (1) Division of rolled product areas during angle rolling Assume that the initial plane shape of the rolled piece is A0B0C0D0, the width is b0, the length is l0, and the angle rolling rotation angle is α. The rolled piece in the angle rolling process is divided into the triangular areas at the head and tail ends and the parallelogram area in the middle. (2) Calculation of roller linear speed during angle rolling The linear speed of the roller is calculated as follows: Where: v is the roller linear speed, m / s; R is the working roller radius, mm; n is the roller speed, r / min; (3) Calculation of the width of the head triangle area When the head triangle area is rolling, the steel bite starts at a point. As the part of the rolled piece entering the rolling mill increases, the width also begins to increase gradually until it reaches the maximum width position. Assume that the width of this area at a certain moment is b 11 , the rolling length of the head triangle area is l 11 , the rolling time of the head triangle area is t 11 , according to the trigonometric function relationship, we have the following calculation formula: the 11 =b0sinα ② When t≤t 11 When , the width of the rolled piece is calculated as follows: (4) Middle parallelogram area During rolling, the width of the roller in contact with the workpiece in this area is constant, and the position of the projection on the roller changes. Assume that the width of this area at a certain moment is b 12 , the rolling length of the middle parallelogram is l 12 , the rolling time of the middle parallelogram is t 12 , according to the trigonometric function relationship, we have the following calculation formula: l 12 =l0cosα-b0sinaα ⑤ When t 11 <t<t 11+ t 12 When , the width of the rolled piece is calculated as follows: (5) Tail triangle area Similar to the head triangle area, the difference is that the width of this area is decreasing, gradually decreasing from the maximum width value until the width drops to 0 when the steel is thrown, and the rolling process ends. Assume that the width of this area at a certain moment is b 13 , the rolling length of the tail triangle area is l 13 , the rolling time of the tail triangle area is t 13 , according to the trigonometric function relationship, we have the following calculation formula: the 13 =l 11 =b0sinα ⑧ The total rolling time t1 for all three zones is calculated as follows: t1=t 11 +t 12 +t 13 ⑩ When t 11 +t 12 When ≤t≤t1, the width of the rolled piece is calculated as follows:

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