CN105095572B - The modeling method of the multipair conjugate pass of I-steel - Google Patents

Abstract

The invention relates to the field of I-beam modeling methods, in particular to a modeling method of multiple pairs of conjugate passes that can greatly reduce the effective length requirements of rolls, even reduce the number of rolling stands and ensure reasonable distribution of rolling forces. It includes the following steps: A. First, complete the modeling of each pass according to the conventional pass modeling method to obtain the non-conjugate pass; B. Secondly, determine the waist thickness of a group of conjugate pass (K1, K2) Size and adjust the curve of the pass in step A accordingly; C, determine the thickness of the I-beam leg and adjust the curve of the pass in step B accordingly; D, determine the height of the I-beam leg and adjust the step The curve of the pass in C is adjusted accordingly, and the leg height (GH) is the conventional pass design value plus an adjustment value of 5-15mm; the remaining conjugate pass modeling: repeat the modeling of the above steps B to D Steps until all conjugate passes have been modeled. The invention is especially suitable for the modeling process in which seven pass types are arranged in the same rolling mill.

Description

Modeling method of multi-pair conjugate pass of I-beam

technical field

The invention relates to the field of modeling methods for I-beams, in particular to a modeling method for multiple pairs of conjugate passes of I-beams.

Background technique

The three-roll rolling mill for rolling section steel generally has three stands (or rolling mills), the first stand and the second stand are three-roll mills, and the third stand is a two-roll mill (usually equipped with finished pass ), three rolling mills are in a row, driven by one motor or two motors. During the rolling process, the rotation direction of the motor remains unchanged, and the rolled piece is rolled back and forth between the two rolling lines of the middle and lower rolls and the upper and middle rolls by the guide and the lifting table. In the process of rolling I-beams with medium-sized tandem mills, there are "medium-sized" I-beams (such as No. 14 I-beams and No. 16 I-beams), but the rolling force is large during the rolling process, and the roll breaks frequently. , Rolling rhythm and other problems are prominent, and basically belong to the state that cannot be produced normally. Medium-sized rolling mills usually use 150 square steel billets for rolling small and medium-sized I-beams of No. 14 and No. 16. The working length of the first and second rolling mill rolls does not exceed 1500mm (too wide and the stiffness of the rolling mill is not enough), and each rolling mill roll can only be equipped with 4 One pass (if the width of the roll ring is too small after a frame is configured with 5 passes, the probability of breaking the roll ring is very high). The third rolling mill is the finished rolling mill and only rolls one pass, and the working length of the rolls is generally 900mm-1500mm.

Usually, the number of pass configurations of the first, second and third rolling mills are 5-3-1 or 5-5-1 respectively.

In the configuration of 5-3-1, there are 9 rolling passes in total, and each pass has large reduction, high rolling force and high roll breakage rate, especially the first stand is difficult to bite into.

In the configuration of 5-5-1, the rolling force of the first stand is relatively large, and the width of the 5-pass roll rings is small and the strength is low, which is prone to accidents of breaking the roll rings. The rolling force of each pass of the second rolling mill is relatively uniform, but the rolling time is long, which does not match the rolling rhythm of the first rolling mill, and the production efficiency is low.

7-3-1 is the best configuration method for this type of section steel rolling. The first stand has more rolling passes, which can greatly reduce the rolling load of the 5-pass configuration. At the same time, because each pass is short, The short rolling time matches the 3-pass rolling time of the second stand, and the production efficiency is also high.

But how to configure 7 different pass types on the (pass) roll that can only be configured with 4-5 different pass types has become an unresolved technical problem in the art.

Contents of the invention

The technical problem to be solved by the present invention is to provide a modeling method of multiple pairs of conjugate passes that can greatly reduce the effective length requirements of rolls, even reduce the number of rolling stands and ensure the reasonable distribution of rolling forces.

The technical solution adopted by the present invention to solve the technical problems is: the modeling method of many pairs of conjugate passes of I-beam, comprising the following steps:

A. First, complete the modeling of each pass according to the conventional pass modeling method, and obtain the non-conjugate pass, so as to ensure the rationality of the metal deformation of each pass and each part from the general modeling direction;

B. Secondly, determine the waist thickness size of one of the conjugate pass types (K1, K2) and adjust the curve of the pass type in step A accordingly, wherein the waist thickness of the K1 pass type is the K1 waist thickness, and the K2 pass type The waist thickness is K2 waist thickness, C is the common waist thickness size on the middle roll, and C=(K1 pass waist thickness+K2 pass waist thickness)/4±T, where T is a constant, and T The value range is 5-10mm;

C, determine the thickness of the legs of the I-beam and adjust the curve of the pass in step B accordingly, the thickness of the legs of the I-beam is specifically divided into the following four sub-steps to determine:

a. When the open leg enters the closed leg, the thinning amount of the lateral pressure of the leg root is 1-7mm;

b. When the open leg enters the closed leg, the thinning amount of the side pressure of the leg tip is taken as 0-3mm;

c. When the closed leg enters the open leg, the thinning amount of the lateral pressure of the leg root is taken as 2-10mm;

d. When the closed leg enters the open leg, the thinning amount of the side pressure of the leg tip is taken as 1-10mm;

Wherein, the thickness of the closed leg of the I-beam leg is equal to the thickness of the closed leg of the roller in the conventional pass design of the common part; Adjustment, the leg height is the conventional pass design value plus the adjustment value of 5-15mm;

Modeling of the remaining conjugated hole patterns: Repeat the modeling steps from Step B to Step D above until the modeling of all conjugated hole patterns is completed.

The beneficial effects of the present invention are: the present invention cleverly utilizes the basic pass pattern obtained by the conventional pass pattern design method, improves the transitional evolution of each step, and obtains the final 7 pass pattern configurations, and there are 3 pairs of passes in them. Conjugate pass, which is the first time in the history of section steel production. In this modeling method, the design of each pass pattern is completed in the initial stage according to the conventional pass pattern design method, so the rationality of the metal deformation of each pass pattern and each part is guaranteed from the general design direction; The pass pattern is improved in turn. Such a progressive design method can not only ensure the accuracy of the basic design, but also greatly reduce the labor load of the designer when designing, and greatly improve the design efficiency of the conjugate pass pattern. The invention is especially suitable for the modeling process in which seven pass types are arranged in the same rolling mill.

Description of drawings

Fig. 1 is a schematic diagram of the completion of each pass pattern by the conventional pass pattern modeling method.

Fig. 2 is a schematic diagram of the common line at the rollers in the present invention.

Fig. 3 is a schematic diagram of the size adjustment of a group of conjugate holes in the present invention.

Fig. 4 is a schematic view of the hole pattern obtained after the modeling of the present invention is completed.

Marked in the figure: upper roll 1, conventional pass modeling upper roll 11, conventional pass modeling middle roll 12, conventional pass modeling lower roll 13, middle roll 2, lower roll 3, open leg 4, closed leg 5. Angled pass centerline 6. Roller pass centerline 7. Common line 8. Open leg root thickness (K2B, K1B), closed leg root thickness GB, leg height GH, and leg tip thickness K1H.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The modeling method of multiple pairs of conjugate passes of the I-beam shown in Figure 1, Figure 2, Figure 3, and Figure 4 includes the following steps:

A. First, complete the modeling of each pass according to the conventional pass modeling method, and obtain the non-conjugate pass, so as to ensure the rationality of the metal deformation of each pass and each part from the general modeling direction;

B. Secondly, determine the waist thickness size of one of the conjugate pass types (K1, K2) and adjust the curve of the pass type in step A accordingly, wherein the waist thickness of the K1 pass type is the K1 waist thickness, and the K2 pass type The waist thickness is K2 waist thickness, C is the common waist thickness size on the middle roll, and C=(K1 pass waist thickness+K2 pass waist thickness)/4±T, where T is a constant, and T The value range is 5-10mm;

C, determine the thickness of the legs of the I-beam and adjust the curve of the pass in step B accordingly, the thickness of the legs of the I-beam is specifically divided into the following four sub-steps to determine:

a. When the open leg 4 enters the closed leg 5, the thinning amount of the lateral pressure of the leg root is 1-7mm;

b. When the open leg 4 enters the closed leg 5, the thinning amount of the leg tip side pressure is 0-3mm;

c. When the closed leg 5 enters the open leg 4, the thinning amount of the lateral pressure of the leg root is 2-10mm;

d. When the closed leg 5 enters the open leg 4, the thinning amount of the leg tip side pressure is 1-10mm;

Wherein, the thickness of the closed leg of the I-beam leg is equal to the thickness of the closed leg of the roller 12 in the conventional pass design of the common part;

D. Determine the height of the legs of the I-beam and adjust the curve of the pass in step C accordingly. The leg height GH is the conventional pass modeling value plus an adjustment value of 5-15mm;

Modeling of the remaining conjugated hole patterns: Repeat the modeling steps from Step B to Step D above until the modeling of all conjugated hole patterns is completed.

For the conventional pass modeling method, the following instructions are provided. As shown in Figure 1, when the conventional pass modeling is performed, there are firstly the conventional pass modeling upper roller 11, the conventional pass modeling middle roller 12 and the conventional pass Modeling the lower roll 13, the design of the pass pattern normally considers the matching relationship between the front and rear pass patterns, as shown in Figure 1, the design of the k2 hole only needs to consider the deformation matching of the corresponding parts of the k1 and k3 holes, because k1\k2\k3 The passes are not at the same vertical (x-axis) position, so there is no common part between them, that is, there is no common part, and each part of the latter pass can deform the corresponding part of the previous pass. The pass design can be done according to the rules. The two pass types corresponding to the upper and lower sides can only use the specified one, and only one pass is rolled. The curves of the upper roll and the lower roll are the same and can be used interchangeably. In Figure 1, k1, k2...in accordance with industry standards, represent the rolling path frequency.

As for the conjugate pass, the conjugate pass is composed of the same middle roll 2 size and different upper roll 1 and lower roll 3 to form different pass types. The curve shapes of the upper and lower rolls are different, and the corresponding pass types It is a pass pattern of two passes, as shown in Figure 4, K1 and K2 are conjugated, K3 and K4 are conjugated, and K5 and K6 are conjugated. A group of conjugate passes are arranged at the same vertical (X-axis) position. Compared with the ordinary pass design, its characteristics are: the upper and lower rolls cannot be used interchangeably, and the shape of the middle roll 2 of the same group of conjugate pass is exactly the same, that is, the middle rolls are shared.

The main idea of modeling in the present invention is: first complete the design of each pass according to the conventional pass design method, so as to ensure the rationality of the metal deformation of each pass and each part in the general direction, and then modify the size to complete the conjugate pass Design, so as to complete the final conjugate pass design.

In the above step B, the waist thickness of K1 is specifically the length (A+C) shown in Figure 3, that is, the waist thickness of the K1 pass is the thickness of the (A+C) segment, and the waist thickness of K2 is specifically shown in Figure 3 The length (B+C) shown in , that is, the waist thickness of the K2 pass is the thickness of the (B+C) segment. From the above two thickness dimensions, the common waist thickness dimension C on the middle roll can be obtained. value. For step C, since the thickness of the leg is divided into the thickness of the root of the leg and the thickness of the tip of the leg, it needs to be divided into four sub-steps. For the adjustment range in step D, the general pass design value plus an adjustment value of 5-15mm.

The concept of the present invention combines the traditional modeling method, but at the same time, it also achieves a creative breakthrough. While taking advantage of the advantages of the traditional design method, it also makes use of the gradual size modification method, which makes a good transition out of the The final qualified conjugate pass product. The method of the present invention can not only ensure that the pass conforms to the rationality of each basic pass and the metal deformation of each part, but also quickly realize the design of the conjugate pass, especially for I-beams. It is believed that the present invention has a very broad market promotion prospect for the design of many pairs of conjugated pass types, and greatly improves the design ability of related fields in my country.

Claims (1)

1. the modeling method of the multipair conjugate pass of I-steel, it is characterised in that comprise the following steps：

A, first, routinely pass modeling method completes the modeling of each pass, obtains non-conjugated pass, with from big volume modeling side Ensure upwards each pass, each position flow of metal reasonability；

B, secondly, determine the waist thickness size of one of which conjugate pass (K1, K2) and the curve to the pass in step A carries out phase It should adjust, wherein the waist thickness of K1 passes is thick for K1 waists, and the waist thickness of K2 passes is thick for K2 waists, and C is the shared waist thickness ruler on central roll It is very little, and C=(waist of the waist thickness+K2 passes of K1 passes is thick)/4 ± T, wherein T is constant, the value range of T is 5-10mm；

C, determine I-steel leg thickness and the curve to the pass in step B adjusts accordingly, the I-steel leg is thick Degree is specifically divided into following four sub-step and is determined：

A, be open leg (4) into leg of remaining silent (5) when leg root side pressure thinning measurement 1-7mm；

B, be open leg (4) into leg of remaining silent (5) when leg point side pressure thinning measurement 0-3mm；

C, leg (5) is remained silent into the thinning measurement 2-10mm of leg root side pressure when opening leg (4)；

D, leg (5) is remained silent into the thinning measurement 1-10mm of leg point side pressure when opening leg (4)；

Wherein, remain silent leg thickness and the leg thickness of remaining silent of the conventional hole type design central roll (12) in common sparing of I-steel leg Degree is mutually equivalent；

D, determine I-steel leg height and the curve of the pass in step C is adjusted accordingly, leg height (GH) is conventional orifices Type design load adds the adjusted value of 5-15mm；

Remaining conjugate pass modeling：B repeat the above steps to the modeling procedure of step D, until completing all conjugate passes Modeling.