JPH05329522A - Speed controller for wide flange shape steel - Google Patents

Abstract

PURPOSE:To improve the quality of the wide flange shape steel by executing the optimum mass flow operation for material to be rolled in a rolling equipment of wide flange shape steel and correcting the table speed on the front and rear surfaces of a mill through this operated result. CONSTITUTION:The wide flange shape materials to be rolled are rolled repeatedly, and arranged adjacent to a universal mill 11 in tandem, webs and edges are shaped, the rolling-down schedules of the universal mill 11 and an edger mill 12 are stored, the number of rolling passes is controlled by a deciding means 5 for the number of rolling passes, the rolling reduction and the rolling- download are compared with each other from the rolling-down information from the rolling-down load storage means 7 and the schedule information from the rolling-down schedule storage means 6 given according to the pass information from the deciding means 5 of the number of the rolling passes. The rolling- down load operated from the rolling reduction is controlled, the edge mass flow is operated by the result from a comparison means 4 of the rolling reduction with the rolling-down load, converted into a forwarding and backwarding ratio and the table speed on the front and rear surfaces of the mill is corrected by an operated result by a mass flow computing element 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for H-section steel used in a universal mill.

[0002]

2. Description of the Related Art Universal mills for rolling H-section steel are
As shown in the plan view of FIG. 1, a pair of horizontal rolls 30 arranged vertically and a pair of hard rolls 3 arranged left and right.
1, the rolling material 33 is constrained and rolled by these rolls to reduce the web and the flange of the H-section steel, and the operation is reversibly repeated for a predetermined number of passes to finish the product of a desired size. It is something that goes on. In the reversible rolling, the edge of the flange is shaped by the edger mill arranged adjacently. As is clear from these figures, the rolled material 33 is reduced in thickness of both the web and the flange due to the reduction of the horizontal roll 30 and the hard roll 31.

FIG. 2 is a detailed view of part A of FIG.

FIG. 3 shows the structure of a conventional mill / edger mill and a conventional speed control device for controlling the speed of the front and rear surface tables of these mills in such rolling. The universal mill UR and edger mill UE and the front and rear surface tables are reversible, respectively. It has rotatable electric motors, which are controlled by a drive. Rolling material speed before and after these mill tables is universal mill UR
When the rotation speed V _R (mpm) of is used as a reference, it is determined by the following formula.

(1) In case of an odd path (downward) 1) Between UR and UE; v _RE = V _R · (1 + α / 100) 2) UE mill; V _E = v _RE
(Mpm) 3) Front of UR mill; v _R = V _R · (1 + β / 100)
(Mpm) 4) UE mill backside; v _E = V _E
(Mpm) Here, v _E = V _E is because the metal flow to the flange and the web does not occur due to the edge face pressure reduction. In other words, it is based on the idea that there is no advanced material for edger mills.

(2) In case of even path (R direction) 1) Between UR and UE; v _RE = V _R · (1 + β / 100)
(Mpm) 2) UE mill; V _E = v _RE
(Mpm) 3) Front of UR mill; v _R = V _R · (1 + α / 100)
(Mpm) 4) UE mill backside; v _E = V _E
(Mpm) The definitions of the advanced rate and the reverse rate mentioned here are as follows. The advance rate α is the ratio of the delivery side material speed V _d (v _RE during odd passes, v _R during even passes) to the peripheral velocity V _R of the mill roll, and α = (V _d / V _R −1) × 100 (%) Further, the reverse travel ratio β is the ratio of the entry side material speed V _e (v _R during odd passes, v _RE during even passes) to the peripheral velocity V _R of the mill roll, and β = (V _e / V _R − 1) × 100 (%).

As described above, the speed of the H-shaped steel material in the tandem arrangement of the universal mill and the edger mill changes on the front and back surfaces thereof due to the reduction of the universal mill UR.

[0008]

Generally, in a universal mill, horizontal rolls 30 and hard rolls 31 are simultaneously pressed in the vertical and horizontal directions, and the metal flow due to the horizontal rolls 30 is always pressed in the rolling longitudinal direction (that is, the advanced portion).
Does not always work, and may occur on the flange end face (called edge) as shown by the dotted line in FIG. However, such a rolling behavior, that is, the quantification between the reduction amount, the rolling dimension and the metal flow of each part of the material has not been performed at present, so in the above-mentioned conventional speed control device for H-section steel,
At the time of actual operation, the operator manually changed the advanced rate α by empirical knowledge while looking at the ammeter and speedometer. The speed unmatching phenomenon caused by this advanced rate α changes the friction between the horizontal roll / front and back surface table roller of the edger mill and the rolled material, so that the abrasion of the surface of the horizontal roll / table roller and the edge of the rolled material are reduced. Increase.

The present invention has been made to solve the above problems, and the speed of H-section steel capable of improving the quality of rolled material and equipment by correcting the advanced rate of rolled material during rolling. An object is to provide a control device.

[0010]

SUMMARY OF THE INVENTION The present invention provides a universal mill for repeatedly rolling H-shaped rolled material, and an edger mill for adjoining the universal mill and arranged in tandem to shape the web and edges of H-shaped steel. , A reduction load storage means for storing the reduction load of the universal mill and the edger mill, a reduction schedule storage means for storing the reduction schedule of the universal mill and the edger mill, a rolling pass number determination means for managing the number of rolling passes,
The pressure reduction and the reduction load are compared from the load information from the reduction load storage means and the schedule information from the reduction schedule storage means given based on the path information from the rolling pass number determination means, and the reduction calculated from the reduction amount. By means of the reduction amount / compression load comparison means for managing the load, and the mass flow calculator that calculates the edge mass flow based on the results from this reduction amount / compression load comparison means, and the result of calculation by this mass flow calculator A speed control device for H-section steel, comprising a table speed correction means for correcting the front and rear table speed of the mill.

[0011]

In the speed control device for the H-section steel according to the present invention, the H-shaped rolled material is repeatedly rolled and arranged in tandem adjacent to the universal mill to shape the web and edges of the H-section steel, and The rolling load of the mill and the edger mill is stored, the rolling schedule of the universal mill and the edger mill is stored, the number of rolling passes is managed by the rolling pass number determining means, and the load information from the rolling load storage means and the rolling pass number determining means are stored. By comparing the pressure amount and the reduction load from the schedule information from the reduction schedule storage means given based on the path information, the reduction load calculated from the reduction amount is managed, and the result from the reduction amount / reduction load comparison means is used. Edge mass flow is calculated, converted to forward / backward ratio, and the mill front and rear table is calculated based on the calculation result by the mass flow calculator. Degrees to correct for.

[0012]

EXAMPLE An example of the present invention will be described below. In FIG. 4, 11 is a universal mill that repeatedly rolls H-shaped rolled material, 12 is an edger mill that is arranged adjacent to the universal mill 11 in tandem to shape the web and edges of H-shaped steel, and 7 is a universal mill 11 and an edger mill. Rolling-down load storage means for storing the rolling-down load of 12;
Reference numeral 6 is a rolling schedule storing means for storing the rolling schedules of the universal mill 11 and the edger mill 12, and 5 is a rolling pass number determining means for managing the rolling pass number.
Is a comparison between the pressure amount and the reduction load based on the load information from the reduction load storage means 7 and the schedule information from the reduction schedule storage means 6 which is given based on the pass information from the rolling pass number determination means 5. Rolling down amount / rolling down load comparison means for managing the calculated rolling down load, 3 is the rolling down amount
A mass flow calculator for calculating an edge mass flow based on the result from the rolling load comparing means 4 and converting it into a forward / backward travel ratio, 9
Is a table speed correction means for correcting the mill front and rear surface table speed based on the calculation result by the mass flow calculator 3, 13 is a universal mill front table roller, 14 is a rear table roller, 15 is a drive motor, 16 is a motor controller, and 17 is Universal mill roll diameter, 18 is edger mill roll diameter, 19 is advanced rate, 20 is reverse rate, 21 is multiplier, 22 is adder, 8 is a reduction load measuring device, and reduction of universal mill 11 and edger mill 12 Calculated from the reduction load storage means 7 for storing the load, the reduction schedule storage means 6 for storing the reduction schedules of the universal mill 11 and the edger mill 12, the rolling pass number determination means 15 for managing the number of rolling passes, and the reduction amount. A reduction amount / compression load comparison means 4 for managing the reduction load,
A mass flow for calculating the edge mass flow from the result of comparison by the reduction amount / reduction load comparing unit 4 based on the pass information from the rolling pass number control unit 5 from the reduction schedule storage unit 6 and the reduction load storage unit 7 and converting it to a forward / backward movement rate. Calculator 3
And a table speed correction means 9 for correcting the table speed of the front and rear surfaces of the mill on the basis of this calculation result. The required reduction load is calculated from the reduction amount, and this is compared with the reduction load currently being rolled. However, if the difference exceeds a certain range, it is considered that the current advance rate is inappropriate and the universal mill front and rear table is corrected during rolling, so the quality of the rolled material and rolling equipment is improved. be able to.

Next, the behavior during odd pass rolling will be described in detail. Figure 4 is a block diagram showing the configuration of the present embodiment, the reduction rate, pressure load comparison means 4, the corresponding path performed at rolling reduction and rolling load P _H of the horizontal and firmness role required for it,
Obtain P _V from the comparison table. This table differs depending on the rolled material size and temperature. On the other hand, the rolling load storage means ₇ constantly samples the loads P _HA and P _VA of the horizontal roll and the hard roll of the universal mill 11 after the rolled material is bitten, and gives the data to the rolling amount / rolling load correspondence table. In the reduction amount / reduction load correspondence table, the deviation from the sampled values for P _H and P _V obtained in advance is taken.

P _HH = (P _HA −P _H ) / P _H × 100 (%) P _VV = (P _VA −P _V ) / P _V × 100 (%) Next, this data is sent to the edge mass flow calculator 3. Then, the following judgment and correction calculation are performed.

[0015] Incidentally, P _HH> 0, when at P _VV> 0 of P _VV> or when P _HH of _{P PH <0, P VV>} 0, to lower the table speed regarded as mass flow occurs to the edge, alpha _F = -K
Correct with P _VV (%). k is a constant.

On the contrary, when P _HH > 0, P _VV > 0 and P _HH > P _VV , or when P _HH > 0 and P _VV <0, there is no mass flow to the edge and it is considered that the mass flow of the web occurs. In order to increase the table speed, correction is performed with α _F = k · P _HH .

Thus, the line speed can be corrected in accordance with the change in metal flow during rolling, so that the quality can be improved.

[0018]

EFFECTS OF THE INVENTION According to the present invention, rolling for producing H-section steel by reversibly repeatedly rolling an H-shaped rolled material by a universal mill and an edger mill arranged in tandem, or two universal mills arranged in tandem. Especially in the equipment, the optimum mass flow calculation of the material to be rolled can be performed during rolling, the speed matching between the mill table and the material to be rolled can be obtained, and the advanced rate can be corrected during rolling, thus improving the quality. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a material being rolled.

FIG. 2 is an enlarged cross-sectional view of FIG.

FIG. 3 is an explanatory diagram of conventional speed control.

FIG. 4 is a configuration diagram showing an embodiment of a speed control device according to the present invention.

[Explanation of symbols]

 3 Edge mass flow calculator 4 Rolling amount / rolling load comparing means 5 Rolling pass number judging means 6 Pressure schedule storing means 7 Pressure load storing means

Claims (1)

[Claims] 1. A universal mill for repeatedly rolling an H-shaped rolled material, an edger mill disposed adjacent to the universal mill in tandem for shaping the web and edge of H-shaped steel, and the universal mill and the edger mill. A reduction load storage means for storing the reduction load,
A reduction schedule storage means for storing the reduction schedule of the universal mill and the edger mill,
Pressure from a rolling pass number determining means for managing the number of rolling passes, load information from the reduction load storing means, and schedule information from the reduction schedule storing means given based on the pass information from the rolling pass number determining means. The amount of reduction and the amount of reduction are compared to manage the amount of reduction calculated from the reduction amount. A speed control device for H-section steel, comprising: a mass flow computing unit for converting into the following; and table speed correcting means for correcting the table speed on the front and rear surfaces of the mill based on the calculation result by the mass flow computing unit.