JPS60124428A - Rolling mill controlling method of discoid blank section - Google Patents

Abstract

PURPOSE:To execute good rolling which causes no slip runaway by distributing and controlling a total motor load to other motor than a reference one by a set distribution ratio, setting a driving motor which is always related to rolling of a discoid section as a reference, and making a roll circumferential speed coincide roughly with the blank section. CONSTITUTION:Motor loads (current values) of five sets of DC motors 10, 14, 20, 32 and 38 for rolling a discoid blank section to a wheel 1A provided with webs are detected by detectors 11, 15, 21, 33 and 39, respectively, and each DC motor load is calculated by a motor load arithmetic comparator 50 in a distribution ratio which has set optionally the sum total of detected values by a motor load distributing, comparing and setting device 51. Revolving speeds of other DC motors 14, 20, 32 and 33 than the reference DC motor 10 are adjusted, respectively, by a control device which is not in the figure, so that both coincide with each other by comparing it with the detected value, and controlled so that each DC motor receives a prescribed load. Accordingly, each roll causes no slip nor runaway, and good rolling is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a drive system of a roll rolling mill for rolling a seven-disk shaped material.

In a roll rolling mill that can be used in the present invention, two or more of the rolls that roll or support each part of a two-disk shaped material, such as shown in FIGS. 2 and 4, are independently operated. This is a roll rolling mill that is driven by a motor. Conventionally, the drive motor of this type of roll rolling mill rotates the circumference of the shaped material at the position where each drive roll rolls the disc-shaped shaped material (hereinafter referred to as the shaped material). The number of rotations of each drive roll was calculated and controlled so that the circumferential speed of each drive roll matched the circumferential speed of the drive roll.

Figure 1, which explains this control method using Figures 1 and 2,
A typical example of a material to be rolled is shown in Figure 2, and a) in Figure 2 shows a material without a hole in the horizontal direction and the rim portion 01.
U'nib part 02. Boss part 04. It is configured with an outer diameter of −IO2.

Figure 2 shows the structure of a roll mill that rolls a material IA without holes (hereinafter referred to as a material IA).The various parts of the material IA are as follows. Rolled. The boss portion 03 is held between the lower center shaft 3 by lowering the upper center shaft 2 in the direction of arrow A1. The lower center shaft is connected to a DC motor 10 via a bearing 9 and is mounted within a fixed housing 12.

The raw material IA is rotated by the drive of the DC motor 10.

The web portion 02 is the upper web roll 4. Arrow A2 of lower web roll 5. It is rolled by rolling down in the A8 direction and moving in the A4 direction.

Upper web roll4. The lower web rolls 5 are each connected via bearings 18.19 to a DC motor 14.20, mounted on a moving base 16.22, and driven by arrows A2. It is rolled down in the direction of A8.

The movable housing 18 is moved in the direction of arrow A4 by a hydraulic cylinder 24 attached to a fixed base 26.

The position of the moving housing 18, ie the moving position of the upper and lower web rolls, is detected by a detection device 25.

The outer diameter portion 05 is rolled by side rolls 6.

The side roll 6 is rotatably mounted inside the bearing box 6, and is rolled down in the direction of arrow A5 by a hydraulic cylinder 28 attached to a fixed base 80.

As the outer diameter of the material IA increases, it retreats in the direction of arrow A6. Note that the position of the side roll 6 is detected by a detection device 29.

Rim part 0] is the arrow A of the upper rim roll 7 and lower rim roll 8? , A8 direction.

The upper rim roll 7 and the lower rim roll 8 each have a bearing 8
1.87 via the DC motor 82. Connected to fl18 and attached to moving pace 84.40.

Hydraulic cylinder 85 attached to moving housing 86
．． 41 to arrow A7. It is rolled down in the direction of A8.

The moving housing 86 is moved by the hydraulic cylinder 42 attached to the fixed base 44 in the direction of the arrow ◯ as the outer diameter of the blank #'IA increases.

The detection roll 45 is pressed against the outer diameter surface of the formed materials L and A by a rolling down device 46, and its position is: +ltc
It is detected by the output device 47. Reduction device 46. Detector:,,
, 447 are attached to the moving housing 86.

In such a roll rolling mill, each roll is processed and sent to a control rotation speed calculator 48.

The rotation speeds of the DC motor 14 that drives the upper web roll 4 and the DC motor 20 that drives the lower web roll 5 are as follows:
Each of them is detected by a detector 15, 21 and sent to a one-rotation speed comparator 49.

The distance XW (see FIG. 3) from the axis of the lower center shaft 8 to the rolling position of the upper and lower web rolls 4.5 is detected by the detector 25 and sent to the control rotation speed calculator 48.

Based on the various data sent by the control rotation speed calculator 48 and the outer diameter dimensions of the upper and lower web rolls 4 and 5, the upper and lower web rolls are
The control rotation speed of the DC motor 14.20 is calculated so that the circumferential speed of the lower web rolls 4 and 5 matches the circumferential speed of the formed material IA, and the rotation speed of the DC motor 14.20 is detected by the 1 rotation speed comparator 49. Compare with. Based on this comparison value, a control device (not shown) controls the rotational speed of DC and 14.20 to ensure that the calculated value and the detected value match.

The number of DC motors 82 and 88 that drive the upper rim roll 7 and the lower rim roll 8 is also controlled in the same manner.

In other words, the raw material 1 detected by the detector 29
Knee 1; The radius dimension of A, the position where the upper and lower rim rolls 7.8 detected by the detector 47 contact the outer diameter of the formed material IA, the reference rotation speed detected by the detector 11, and the upper and lower rim rolls 7 According to the outer diameter dimension of .8, the control rotation speed calculator 48 determines the control rotation speed of the DC motor 82.88 so that the circumferential speed of the upper and lower rim rolls 7.8 matches the circumferential speed of the formed material IA.
Calculate with.

The rotational speed value of the DC motor 82.8g detected by the detectors 88.89 and the calculated value are compared by the rotational speed comparator 49, and the DC motor is controlled by a control device (not shown) so that the calculated value and the detected value match. The rotation speed of the motors 82,88 is controlled.

In this way, in conventional roll rolling mills, the rotational speed of each DC motor is computationally controlled to match the circumferential speed of the formed material, but the shape of the roll driven by direct current to be controlled is , Abacus beads: regular or truncated conical shape, and it is difficult to match the circumferential speed of the roll with the circumferential speed of the blank material, which differs in each part, so it is controlled by an approximate average value. Various improvements have been made such as: v
% was not sufficient.

FIG. 8a) shows the drive horsepower of the DC motor 14 that drives the upper web roll 4 and the DC motor 2 that drives the lower web roll 5 when the formed material IA is rolled using the conventional control method.
An example of changes in the drive horsepower m-1 of 0 and the drive horsepower [08 of the DC motor 10 that drives the lower center shaft 8] is shown.

The horizontal axis of the figure shows the movement position of the upper and lower web rolls 4.5.

As is clear from the figure, the upper and lower web rolls 4.5
At the beginning of the movement, all three DC motors act effectively as rolling power, but the upper and lower web rolls 4 and 5
As the movement progresses, a large change occurs, and the value of the drive horsepower HO8 of the DC motor 10 comes to show a negative value.

This means that the DC motor 10 is acting as a brake, so the other DC motors 14° and 2Q take charge of all the rolling power, and the DC motor 17tPg1O takes over the power acting as a brake. We will have to take responsibility for this as well.

On the other hand, this tendency also exists in the DC motor 20, and this tendency becomes more pronounced as the difference between the rolling amount h++ and h2 of the upper and lower parts of the material shown in FIG. DC motor 82. ．． The present inventors have discovered through experiments that 88 also has a tendency similar to bar jF.

One of the major factors contributing to this is the complexity of each roll having the shape of an abacus bead and two truncated cones, but the biggest factor is thought to be that the shape of the raw material is a disk.

In other words, the deformation behavior of the material is extremely complex when rolling a single disc-shaped material using a general-purpose roll such as a web roll to create a cross section, and it is difficult to even understand the actual situation. The reality is that it has not been done. °This・
Due to the complex deformation behavior, conventional calculation control of the DC motor rotation speed is considered to be insufficient.

In fact, when rolling experiments were conducted using the conventional control method, the load on one of the DC motors often exceeded the allowable value, and rolling had to be stopped.

It can be easily concluded that it is extremely difficult to correct this by simply accumulating rolling data. The present inventor conducted various experiments on new control methods and discovered the control method of the present invention.

The present invention uses a standard system so that each motor can receive the power (motor load) required for rolling at an arbitrarily set distribution ratio, or at a distribution ratio determined from a comparison value of the rolling blades of each driven rolling roll. The system controls each motor load by adjusting the rotational speed of motors other than the motor of the drive roll, and furthermore, by combining the control method of the present invention and the conventional rotational speed calculation control method, it is possible to efficiently and It is also intended to minimize wear and tear on the rolling rolls.

The present invention will be explained in detail below with reference to FIG.

Akira Honka's method of controlling the motor is shown in Fig. 2 by using a DC motor 10.
, 14.20.82.88 are detected by the detectors 11.15.21.88.89, respectively, and the sum of the detected values is calculated as the motor load by the motor load calculation comparator 5o. According to the distribution ratio arbitrarily set by the distribution ratio setting device 51,
Each DC motor load is calculated and compared with the detected value, and a control device (not shown in the figure) is used to check the DC motors 1, other than the DC motor 1o, between the reference values and the detected value.
4.20゜tl! C, which adjusts the rotational speed of 9.98 and controls each DC' (Jl-Y) so that it takes charge of a predetermined load, is also i-Oki.

The present invention will be explained in more detail.

When the present invention is applied to the roll rolling mill shown in FIG. 2, the following three control methods are applied.

b) DC motor 10 and DC motor 14. DC motor 2
Control of motor load between 0 and 0.

mouth) DC motor 10 and DC motor 82. DC motor 88
Control of Moj between.

・) Motor load control between all DC motors.

First, a) DC motor 1o and DC motor 14. In the case of controlling the motor load between the DC motors 20, the load control value of each DC motor is calculated according to the following formula.

Tc5w = β08W ・(OB ・i08 + iW
U + 1WL) −−1) TWO=βWTJ ・(0
1・iC8+1VITJ +-1WL) ・A”-2)
rwL=βWL -(0]・-108-1-1iWU
+ 1WL) Number of songs - 8) However, βc'sw + βWU
+ SL = 1 where Iasw; load control value (A) of DC motor 1o fWU: Jl 14 (7) Jl
(A) rwL: // 20ノ, Jl (A) β08
W: // Load distribution ratio βwU of 10: Jl 14 〃 βWL: // 20 〃 +08: i IQ load detection value (A) iWU:
Jl 14 // (A)iWL: Jl 20
〃(A) 0,: In the load detection value distribution queen of tt 1o, the coefficient 0. is determined by the rolling mode. For example, if the DC motors 82 and 88 are not involved in rolling, that is, if the rim portion 01 of the formed material IA is not rolled, C+ = 1.0, and the rim portion 01 If both are rolled at the same time, their value will be smaller. When rolling the rim part 01 at the same time.

For convenience, it may be determined using the following formula.

Here, AWU: Rated or allowable current under load of the DC motor 14 (A) AWL: Rated or allowable current under load of the DC motor 20 (A) ARU: Rated or allowable current under load of the DC motor 32 (A) ) ARI-: Rated or allowable load current value of DC motor 38 (A) 1. (↓: Formula 1), 2), 8) The value calculated by the following formula satisfies the following formula. Adjust the rotational speed of the DC motor 14.20 as required.

10SW = 0B-ic8 ・River... Song...
・・・River・・・・・・・・・Song・・・・・・5) IW
TJ = 1WTJ: ”4. Opening, opening, opening, opening, hitting, 6) TWL = iWL −−−−
・・Song・・・・Song・・・・・・・・・・・・・
...7) 口)ノDC motor 10 and DC motor 82. In the case of controlling the motor load between the DC motors 88, the load control value of each DC motor is calculated using the following formula as described above.

Ic5yt = β08R・(02・+08 +iRU
+ iRl,, door = -8) irtU -βR,U ・(
C! 2 ・i08+ iRU + 1RL) −・−=
9) IRL = βnl−・(02・+08 + iRU
+ 1RL) - -10) However, βCAR + βRU + βRL = 1 where, rcsrt: DC motor 10
Load control value (A) IRU: z 820 〃(A) TRL: /l 88 〃(A) ρ08R: Load distribution ratio βRU of DC motor 10: 〃8
2 βRL: 0 88 iRU: I 82 load detection value (4) iRL: DC motor 38 load detection value (A) C2: Load detection value distribution coefficient of 10 In the above, coefficient 02 is the rolling form For example, if the DC motors 14 and 20 are not involved in rolling, that is, if the web part 02 of the formed material IA is not rolled, C2 = 1.0, and if the web part 02 is rolled at the same time. The value of C2 becomes smaller.

When rolling the web portion 02 at the same time, it may be determined simply by the following formula.

The rotational speed of the DC motor 82.88 is adjusted so that the values calculated by the above equations 5), 6), and 7) satisfy the following equation.

rasn = C2・408' ・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
...12) TRU = iRU ......
・・・・・・・・・・・・・・・・・・・・・・・・
...ta) IRL = iRL ......
・・・・・・・・・・・・・・・・・・・・・・・・
14) In the case of controlling the motor load between all DC motors in No. 9, the load control value of each DC motor is calculated using the following formula.

+cs-βaS・(lt08++ Punishment WL+i RU+
iRL) ・・・・・・・・・15) IWTJ
-βWU・(i08+iWU+iWL+iRU+iRL
) ・・・・・・・・・16) −IWL −βWL・
(WTJ+iWL+iRU+1RL published by its)...
...17)) IruJ-βRU・(+08+1
WTJ+iWL+iRU+1RL) --=18)IR
L-βRL・(i08+iWU+iWL+iRU+1R
L) =-・-=19) However, βC8+βvyi
y + βWL + βRU + βRL = 1 where, TcB:
Load control value of DC motor 10 (A) βas: //
Load distribution ratio of 10 (A) - Adjust the rotational speed of DC motors 14, 20, 82, 88 so that the values calculated using equations 15) to 19) above match the load detection values of each DC motor. .

Note that it is important that the reference DC motor be a DC motor that constantly drives the rolls involved in rolling from the start of rolling of the formed material to the end of rolling.

The present invention targets the load of the DC motor as a control object, and it is not possible to use the DC motor that drives the rolls as the basis for a state in which it does not participate in rolling from the start of rolling of the formed material to the end of rolling. Undesirable.

The DC motor 10 provides rotation to the raw material IA, and this drive is continued until the end of the maze, so it is most suitable as a base one-wheel motor.

In the present invention described above, the motor load distribution ratio is set by the setting device 51, but the present invention also proposes a method for automatically setting the motor and load distribution ratio.

・What is proposed here attempts to determine the motor load distribution ratio based on the detected value of the rolling blade of the driven roll, and is implemented by the following method.

First, the DC motor 10 and the DC motor 14 of A) mentioned above,
The case of controlling the motor load between the DC motors 20 will be described.

Upper web roll 4. Detect and calculate the rolling blade of the lower web roll 5,
Further, a feed force detector 54 detects and calculates the feed force of the movable housing 18, that is, the feed force of the upper and lower web wheels 4 and 5.

Based on each calculated value, a motor load distribution ratio calculator 55. between the DC motors 14.20. The motor load distribution ratio between the DC motors 14 and 20 is calculated using the following formula.

αWL = 1-α punishment ・・・・・・・・・・・・・・・
··················river······
...21) Here, αWU: Load distribution ratio of the DC motor 14 (upper web roll 4) αwL: Load distribution ratio of the DC motor 20 (lower web roll 5) PWU: Reduction blade of the upper web roll 4 ( Detection calculation value:
ton) Pwt: Reduction blade of lower web roll 5 (detection calculation value:
ton) PwI (: Feed deer of moving housing 18 (detection calculation value:
ton) al: Motor load distribution coefficient C2: Distribution coefficient of feed car In the above, the coefficient value of +"l+82 must be determined accurately by experiment, but for convenience, both may be set to 10.

Next, the DC motor 14.20 and the reference DC motor lO
The motor load distribution ratio between is determined by the motor load distribution ratio calculator 59 using the following formula.

By β = (l-βC5W)・α punishment ・・・・・・・・・
・・・・・・・・・・・・・・・23) Allowable current value (
A) DC motor lO and DC motor 82. DC, -
In the case of motor load control during No. 88, a) 11.
The motor load distribution ratio is calculated in the same way as in the case of control.

The rolling force detection calculators 56 and 57 detect and calculate the rolling forces of the upper rim roll 7 and lower rim roll 8, respectively, and based on these calculated values, the motor load distribution ratio calculator 58 between the DC motors 82 and 82 calculates the following: DC motor 82.88 by the formula
Calculate the motor load distribution ratio between

PRU αRU=l), Old... Concave curve...
・25) PRU 10 PRL aRL = 1-αRU ・・Song...Song...Song...Between songs...Song ・26) Here, αRU: Load of DC motor 82 (upper rim roll 7) Distribution ratio αRL: Load distribution ratio of DC motor 88 (lower rim roll 8) PRU: Lowering force of upper rim roll 7 (detection calculation value: t
on) PRL: Reduction force of lower rim roll 8 (detection calculation value: 巳o+v) bl: Motor load distribution coefficient In the above, the coefficient value of bl needs to be determined by experiment to be precise, but it is simply 1.0 ' may also be used.

Next, the motor load distribution ratio between the DC motor 82, 88 and the reference DC motor L 10 is determined by the motor load distribution ratio calculator 59 according to the following formula.

βRU=(1-β08R)・αRU・・・・・・・・・
・・・・・・・・・・・・・・・・・・28) βRL-(
l-β08R) ・aRL・・・・・・・・・・・・
・River/Mountain... 29) When controlling the load between all the DC motors in ・9 above, the motor load distribution ratio calculator 59 determines the load according to the following formula.

βRU, = (1-β08-βVIIIJ-βWL)
・12RUβRL2(1-βas-βpunishment-βWL)・α
RL, where C3: load distribution coefficient C4 of the DC motor 10
:DC, load distribution coefficient of motor 14.20 In the above, the value of coefficient 03+04 needs to be determined by actual practice or experiment, but it may be set to %110 for convenience.

In the present invention, the load calculation control method that uses the negative 1 of the DC motor as the control target is further combined with the rotation speed calculation control method that uses the rotation speed of the DC motor as the control object as described above as a conventional control method. This paper also proposes a control method that compensates for the shortcomings of the arithmetic control method and is efficient and prevents wear and tear on the drive roll.

This control method has the function of determining whether or not the roll driven by the DC motor to be controlled is involved in rolling. It is characterized in that it is used in combination with the rotation speed calculation control method while the rolling machine is not involved in rolling.

Whether or not the drive roll is involved in rolling is determined based on the detected value of the rolling blade of the drive roll.

In FIG. 2, it is determined whether the upper and lower web rolls are being rolled at 4°.

On the other hand, the rolling blades of the upper and lower rim rolls 7.8 are also detected and calculated by the rolling force detection calculators 56, 57, and based on the calculated values, the determining unit 60 determines whether the upper rim roll 7 and the lower rim roll 8 are respectively rolling. Determine if there is. Based on these judgment results, if the roll to be controlled is rolling using a control mode switch not shown in Figure 9, switch to a control method that combines the load calculation control method and the rotation speed calculation control method. On the other hand, when rolling is not being carried out, the method is switched to the one-rotation speed calculation control method.

In the above, the control method that uses both the load calculation control method and the rotation speed calculation control method means that the rotation speed of the DC motor is monitored even while the load calculation control is being performed, and if the rotation speed exceeds the allowable limit. for.

Driving a DC motor at the permissible rotation speed of 2J-'1
It means li11.

j>"l In Fig. 2, the conventional control method described above is
As shown above, the allowable limit calculator 61 compares the allowable limits based on the P times: revolutions calculated by the control rotation speed calculator 48 based on the position 2 dimensions of each roll, the reference port x provisional number, etc. However, if the detected value is less than the calculated value, load calculation control is performed as is. If the detected value is greater than the calculated value, that is, below the allowable limit, then the circumferential speed of the formed material and the circumference of the roll are Since the speeds are almost the same, the impact between the material and the roll can be minimized.

Furthermore, even if the roll does not fit properly into the formed material, or slips, during load calculation control, the DC motor can be prevented from running out of control. This makes it possible to efficiently prevent wear and tear on the drive roll. In addition, drive roll learning 1. - It can also be implemented with a detector of the motor load, an operation schedule of the drive rolls, etc.

FIG. 3b) shows an example of the effects of the present invention.

As mentioned above, FIG. 8a) shows the result carried out using the conventional rotational speed calculation control, but by comparing the two, it can be seen how effective the present invention is.

Figure 3b) shows the load distribution ratio between DC motor 10 and DC motor 14°-DC motor 20 at 0.80:0.45.
: Load of each motor when controlled to 0.25 (in the figure, drive horsepower T(as, T(WU, I(W)
The test value (indicated by L) shows that it is well controlled.

That is, it can be seen that by applying the present invention, any DC motor can be effectively used as a rolling power, and a disc-shaped material can be rolled smoothly and efficiently.

Fact 2: In rolling experiments to which the present invention was applied, two disc-shaped materials could be rolled smoothly without the drawbacks of conventional methods, such as overloading one of the DC motors and forcing the rolling to be stopped. It was possible to roll efficiently.

FIG. 4 shows a state in which the formed material IB with holes is being rolled by the roll rolling mill shown in FIG. 2.

In the figure, 8A is a roll that rolls the inner diameter surface of the formed material IB, and is attached to the lower center shaft 8.

The present invention is also applicable to the rolling of the formed material IB with holes as described above, and the present inventors have proposed the method applied to the above-mentioned formed material IA without holes.

[Brief explanation of the drawing]

FIG. 1 shows an example of a disc-shaped material to be rolled by a roll mill to which the present invention is applied. FIG. 2 is an explanatory diagram of the main parts of a roll rolling mill for disc-shaped materials to which the present invention is applied, and an example of a control system diagram of the present invention. FIG. 3a) is an experimental example showing the effect of applying the present invention to the conventional control method. FIG. 4 is an explanatory diagram of roll arrangement when rolling a disc-shaped material with holes using the roll rolling mill shown in FIG. 2. Patent Applicant: Director of the Agency of Industrial Science and Technology, W. Kawada, 3rd tA , Name of the invention Person amending the method for controlling a roll rolling mill for disc-shaped materials Date of amendment order (shipment date) February 28, 1980 Target of amendment (1) Page 9, line 7 of the specification [The horizontal axis in the figure is -1, which is corrected to "The horizontal axis in the figure is XW." (2) ``Figure 6...'' on page 28, lines 14 and 15.
...Experiment example. " is corrected to "FIG. 3 a) is a graph showing changes in driving horsepower of the center shaft and web roll according to the conventional control method. FIG. 3 b) is a similar graph according to the method of the present invention." (3) Replace Figure 3 of the drawing with an attached sheet.

Claims (1)

[Scope of Claims] 1) In a roll rolling mill in which two or more rolls that roll or support each part of a disc-shaped material are independently driven by motors. , The motor load of each drive roll is detected with reference to the drive rolls that are always involved in rolling from the start to the end of rolling of the material. Determine the total load required for rolling from the detected value and calculate the pressure. The load on each motor is controlled by adjusting the rotational speed of the motors other than the motor of the reference drive roll so that each motor takes over the total negative gate required for the extension at an arbitrarily set distribution ratio. A method for controlling a roll rolling mill for disc-shaped materials. 2) Control of a roll rolling mill for disc-shaped materials according to claim 1, characterized in that the load distribution ratio of each drive roll is determined by the detected value of the rolling blade of the drive roll. Method. 3) Check whether each drive roll is involved in rolling.
an operating schedule for the drive roll; The determination is made based on one or more of the detection value of the rolling blade of the drive roll, the detection value of the motor load of the drive roll, etc., and the drive roll is involved in rolling. When not, the rotation speed of the drive roll calculated from the geometric conditions such as the detected value of the dimensions of the raw material being rolled, the roll dimension, the detected value of the roll position, and the rotation speed of the reference drive roll is calculated. as a controlled object, and while the drive roll is involved in rolling. The motor load of the drive roll is controlled, and
The disc-shaped element according to claims 1 and 2, characterized in that even while the motor load of the drive roll is controlled, an allowable limit is set for the rotation speed of the drive roll. A method of controlling a roll rolling mill for profile parts.