JPH0459961B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a roughing universal rolling mill for H-section steel. [Prior Art] Generally, when hot rolling of H-beam steel is performed using the minimum number of mill configurations, the process is as shown in FIG. This is done by a combination of rolling mills 4. i.e. slab,
After raw materials such as rectangular steel billets and steel billets for H-beams are roughly formed into a predetermined shape using a breakdown rolling mill 1, the flange thickness and web thickness are rolled using a rough universal rolling mill 2, and the flange width is rolled using an edger rolling mill 3. After a plurality of intermediate rolling passes consisting of rolling, an H-section steel product is obtained by one pass in which flanges are raised in the finishing universal rolling mill 4. The rolls and guides used in these rolling mills vary depending on the product size, so it is necessary to replace the rolls for each product size.In general, when replacing the rolls of a rough universal rolling mill or later, the entire rolling mill stand is replaced. A method is being taken. [Problems to be solved by the invention] However, H
Regarding the manufacture of shaped steel, there is a big problem of a decrease in efficiency due to the above-mentioned replacement of stands, and there is also a problem of increased equipment costs because it is necessary to have stands to be replaced. Furthermore, even in the case of a mill configuration consisting of multiple stands, all the rolling stands must be replaced, so the latter problem is even more serious. In addition, each of these rolling mills has a motor, and since tandem rolling is performed in the rough universal rolling mill row, it is necessary to control the tension, and the electrical and instrumentation-related equipment is also large. In the present invention, in the rough universal rolling stage,
The purpose is to eliminate the need to replace the rolls of an edging rolling mill, and to reduce the need for electrical and instrumentation-related equipment. [Means for Solving the Problems] The present invention provides a rough universal rolling mill for H-section steel that hot-rolls H-section steel using rolling rolls consisting of a pair of horizontal rolls and a pair of vertical rolls. Each roll is provided with an hourglass-shaped edging roll whose roll gap can be adjusted during rolling and which is not driven and has no hole. [Function] As a result of a detailed study on the above-mentioned problems faced by the prior art, the present inventors have found that, in a row of rough universal rolling mills, an edge roll is attached to the rolling roll of the rough universal rolling mill, and the driving force of the rolling roll is increased. We obtained the knowledge that it is possible to perform edge rolling by pushing the material to be rolled into the edge roll or pulling it out from the edge roll, and we also applied this to multiple pass rolling using a single stand. As a result of application, the present invention has been completed. 1 and 2 are schematic diagrams showing the configuration of a rough universal rolling mill 10 according to the present invention. For example, a rough universal rolling mill 1 having a mill configuration as shown in FIG.
Applies to 0. The rough universal rolling mill 10 is
It has a rolling roll 13 consisting of a pair of horizontal rolls 11 and a pair of vertical rolls 12, and is provided with drum-shaped edging rolls 14 and 15 without holes on the entry and exit sides of the rolling roll 13, respectively. These etching rolls 14, 15 are incorporated into the same housing as the rolling roll 13 either directly or via a dedicated housing. These etching rolls 14 and 15 have a structure that allows the roll gap to be adjusted during rolling, but do not require driving force for rolling. Note that the etching rolls 14 and 15 do not need to be driven for rolling down as described above, but in order to prevent them from seizing with the material, a simple rotating device is used to rotate the circumference at the speed of the material at the time of biting. It is desirable that speed be provided. In order to stabilize rolling, it is preferable to attach a friction type guide 16 as shown in FIG. 4 or a roller type guide 17 as shown in FIG. 5 to the edge roll portion. That is, the present invention has the following effects. By using a drum-shaped etching roll that does not have holes, it is possible to eliminate the need to change the roll for changing the size. In other words, by using a drum-shaped edging roll with no holes, it is possible to roll H-beam steel with any type of flange width or web height by simply adjusting the roll opening, making it possible to change the size. This eliminates the need for roll replacement. By making the etching roll non-driven, a mill motor, a speed control device, etc. are unnecessary, and various equipment can be reduced. By making it possible to adjust the roll gap between the edge rolls during rolling, the non-driven edge roll can be driven using the driving force of the universal rolling mill. In other words, when the end of the material to be rolled is not caught in the universal rolling mill, the opening degree of the edge roll is set to be larger than the flange width, so that the end of the material to be rolled is always caught in the universal rolling mill. Make sure it stays that way. After the material to be rolled gets caught in the universal rolling machine,
Rolling by the edge rolls is started in a state where the material to be rolled is present between the upper and lower edge rolls, and it is possible to perform push edge rolling or pultrusion edge rolling using the driving force of the universal rolling mill. . [Example] Next, a method of setting the etching roll during actual rolling will be described. FIGS. 6 and 7 show an example thereof. First, in the method of FIG. 6, from the edge roll 14 to the edge roll 1 as shown in A,
When rolling in the direction of 5, the edge roll 14
is set to a roll opening equal to the entry side flange width dimension _B0 , and the etching roll 15 is set to the target flange width _B1 for that pass. Therefore, since the flange reduction of the leading end of the material is performed by push rolling on the exit side, the driving force is transmitted from the universal rolling mill. However, in this case, the driving force is no longer transmitted at the rear end of the material, so the distance L 2 from the rear end of the material to the center of the etching roll 15 is different from that of the universal mill and the edge roll ₁ , as shown in B.
The etching roll 15 is opened until the amount of etching becomes 0 in a section where the center-to-center distance L1 with respect to the roller 5 is larger than ₁ . After that, as shown in C, in rolling from the edge roll 15 to the edge roll 14, the edge roll 14 is set to the target flange width B ₂ and rolling is performed so that the overall length of the material is the same. This means that it can be rolled to a flange width of . Next, in the method of FIG. 7, when rolling is initially carried out from the edge roll 14 to the edge roll 15 as shown in A, similar to the method of FIG. The roll opening is set to be equal to the flange width dimension B ₀ , and the edge roll 15 is set to the target flange width B ₁ for that pass for rolling. However, the distance L ₄ from the tip of the material to the center of the edge roll 14 Roll roll 13
As shown in B in the section where the center-to-center distance L between the edges and the edge roll 14 is larger than ₃ ,
Reduce the opening until it reaches the target flange width for that pass. Therefore, at this time, on the entry side, the tip portion that could not be rolled down on the entry side is rolled down by pultrusion rolling, and on the exit side, by push rolling. As a result, as shown in C, in this rolling case, 1
The entire length can be rolled to the same flange width in a pass in the same direction. In addition, in the above explanation, regarding the target flange width
The reason for setting B ₁ or B ₂ is that in actual rolling, universal rolling causes flange width expansion, width contraction, and edge width return, so these must be set to different values. be. In addition, the timing of these reduction changes is determined based on information from position detectors placed on the entrance and exit sides of the rolling mill, as well as rolling speed and advance rate predictions, and the setting of the opening of the edge roll is similarly determined using the flanges placed on the entrance and exit sides. This was determined from the information from the width gauge and the prediction of width expansion in universal rolling. Furthermore, in the pass where the driving force required for etching at the end of rough rolling is small, the inertia of the material itself exceeds this driving force, so there is no need to use the above rolling pattern, and rolling can be completed by only etching on the exit side. was possible. The H-beam steel rolled in this way had no variation in flange width over its entire length, and could be rolled to the target dimensions. Furthermore, there was no decrease in efficiency due to this method. Furthermore, the increase in power consumption on the rolling roll side for the driving force of the cutting roll was at most about 10% of that in rolling with a rolling roll alone, and there was no need to newly increase the capacity of the motor. As is clear from the above embodiments, the present invention provides non-driven edge rolls on each of the input and output sides of one rolling roll, and adjusts the roll gap between the respective edge rolls during rolling. It is now possible to roll rough universal rolling steps in multiple passes with one rolling mill, and compared to the conventional minimum mill configuration, there is no need for an edger rolling mill, its motor, and peripheral equipment, and there is no need to replace stands. This reduced the time required and improved production efficiency. By these methods, nominal dimensions H400×200×8
Tables 1 and 2 show the pass schedule when rolling ×13 H-beam steel. Table 1 corresponds to the method shown in FIG. 6, and Table 2 corresponds to the method shown in FIG. However, in any case, the etching after the 5th pass is done only on the exit side of the universal mill due to the inertia of the material.

【table】

【table】

【table】

[Table] Force was used as the driving force. In addition, the rolling mill is U
is a roughing universal mill, _E1 is an etching roll on the upstream side of the process, _E2 is an etching roll on the downstream side of the process, and UF is a finishing universal mill. Also,
Regarding the flange width in the table, top means the downstream side of the process, that is, the leading edge of the material in odd-numbered passes, and the trailing edge of the material in even-numbered passes, and bottom means the upstream side of the process, that is, the trailing edge of the material in odd-numbered passes, and the trailing edge of the material in even-numbered passes. In the pass, it means the tip of the material. Further, the initial flange width and the flange width in universal rolling are actual values, and the others are set values. [Effects of the Invention] As described above, according to the present invention, it is possible to eliminate the need to replace the rolls of the edging rolling mill in the rough universal rolling stage, and to reduce the number of electrical and instrumentation-related equipment.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing a rolling mill according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a layout diagram showing a mill configuration to which the rolling mill of the present invention is applied. , FIG. 4 is a front view showing the guide of the etching roll, FIG. 5 is a front view showing the guide of the etching roll, and FIGS. 6A to C are steps showing the etching rolling method using the rolling mill of the present invention. Figures, Figures 7A-C
8 is a process diagram showing an edging rolling method using the rolling mill of the present invention, and FIG. 8 is a layout diagram showing a conventional mill configuration. 10...Rough universal rolling mill, 11...Horizontal roll pair, 12...Vertical roll pair, 13...Rolling roll, 14, 15...Edging roll.

Claims (1)

[Claims] 1. In a rough universal rolling mill for H-section steel that hot-rolls H-section steel using rolling rolls consisting of a pair of horizontal rolls and a pair of vertical rolls, the roll gap can be adjusted during rolling on each of the entry and exit sides of the rolling rolls. A rough universal rolling mill for H-beam steel, characterized in that it is equipped with a non-driven drum-shaped etching roll that does not have a hole shape.