JPH0451253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of controlling a roll mill that rolls and forms a disc-shaped material.

[Conventional technology]

A roll mill as shown in FIG. 4 has been proposed as an apparatus for rolling a disk-shaped material 1A (hereinafter referred to as the material 1A) as shown in FIG.

That is, 2 and 3 are lower center shafts that vertically hold the boss portion 03 of the raw material 1A. The formed material 1A is rotated by the drive of the DC motor 10. 4 and 5 are upper and lower web rolls for rolling and forming the web surface 02 of the formed material 1A, and each has a bearing 1.
3 and 19 to DC motors 14 and 20, and are attached to moving bases 16 and 22, and are pressed down in the directions of arrows A2 and A3 by hydraulic cylinders 17 and 23 attached to moving housing 18. This movable housing 18 is attached to a fixed base 26.
The hydraulic cylinder 24 attached to the arrow A
4, and the position of the moving housing 18, that is, the moving position of the upper and lower web rolls is detected by the detection device 25. Reference numeral 6 denotes a side roll for rolling and forming the outer diameter surface 05 of the raw material 1A, which is rotatably mounted in the bearing box 27 and moved by the arrow A5 by the hydraulic cylinder 28 attached to the fixed base 30.
While being rolled down in the direction of , it retreats in the direction of arrow A6 as the outer diameter D of the formed material 1A increases. Note that the position of the side roll 6 is detected by a detection device 29. 7 and 8 are upper and lower rim rolls for rolling and forming the rim surface 01 of the raw material 1A, respectively, bearings 31 and 37.
A hydraulic cylinder 35, which is connected to the DC motors 32, 38 via, is attached to the moving bases 34, 40, and is attached to the moving housing 36.
41 in the direction of arrows A7 and A8.

This movable housing 36 moves the material 1A by a hydraulic cylinder 42 attached to a fixed base 44.
is moved in the direction of arrow A9 as the outer diameter D increases. The detection roll 45 is pressed against the outer diameter surface of the formed material 1A by a rolling down device 46, and its position is detected by a detection device 47. Reduction device 46,
The detection device 47 is attached to the moving housing 36.

By the way, in such a rolling mill, each DC motor has conventionally been controlled as follows.

That is, the rotational speed of the DC motor 10 that drives the lower center shaft 3 is held constant and is used as a reference rotation, and this reference rotational speed is detected by the detector 11 and sent to the control rotational 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 detected by detectors 15 and 21, respectively, and sent to the rotation speed comparator 49. Upper and lower web rolls 4,
The distance to the rolling position No. 5 is detected by the detector 25 and sent to the control rotation speed calculator 48, and the various data sent to the control rotation speed calculator 48 and the upper
The circumferential speed of the upper and lower web rolls 4 and 5 and the material 1A depend on the outer diameter dimensions of the lower web rolls 4 and 5.
The control rotation speeds of the DC motors 14 and 20 are calculated so that the circumferential speeds of the DC motors 14 and 20 match, and the rotation speed comparator 49 compares the rotation speeds of the DC motors 14 and 20 with the detected rotation speeds of the DC motors 14 and 20. The DC motors 14 and 20 are controlled by a control device (not shown) so that the detected values match.
The rotation speed was controlled.

Similarly, for the DC motors 32 and 38 that drive the upper rim roll 7 and the lower rim roll 8, respectively, the radius dimension of the formed material 1A detected by the detector 29 and the detection roll 4 detected by the detector 47 are
The circumferential speed of the upper and lower rim rolls 7 and 8 can be determined based on the position where the roller 5 contacts the outer diameter of the formed material 1A, the reference rotation speed detected by the detector 11, and the outer diameter dimensions of the upper and lower rim rolls 7 and 8. The rotational speed of the DC motors 32, 38 that matches the circumferential speed of the profile 1A is calculated by the control rotational speed calculator 48, and the rotational speed of the DC motors 32, 38 detected by the detectors 33, 39 and this calculated value are calculated. are compared by a rotation speed comparator 49, and the rotation speeds of the DC motors 32 and 38 are controlled by a control device (not shown) so that the calculated value and the detected value match.

[Problem that the invention seeks to solve]

In this way, in conventional roll rolling mills, the rotation 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 the DC motor to be controlled is abacus. It has a bead shape or a truncated cone shape, and the circumferential speed of the roll differs in each part, making it difficult to match the circumferential speed of the formed material. Therefore, various improvements have been made, such as controlling it using a rough average value. However, it was not enough.

FIG. 5a shows the drive horsepower HWU of the DC motor 14 that drives the upper web roll 4 and the lower web roll 5 when the formed material 1A is rolled using the conventional control method.
An example of changes in the drive horsepower HWL of the DC motor 20 that drives the lower center shaft 3 and the drive horsepower HCS of the DC motor 10 that drives the lower center shaft 3 (the horizontal axis in the figure is
The moving positions of the upper and lower web rolls 4 and 5 are shown. ) is shown.

As is clear from the figure, at the beginning of the movement of the upper and lower web rolls 4 and 5, all three DC motors act effectively as rolling power, but as the movement of the upper and lower web rolls 4 and 5 progresses, , a large change occurs, and the drive horsepower of the DC motor 10
The HCS value will now show a negative value. This means that the DC motor 10 is acting as a brake, and therefore the other DC motors 14, 2
0 is in charge of all of the rolling power, and the DC motor 10 must also take into account the power acting as a brake.

On the other hand, this tendency also exists in the DC motor 20, and this tendency is caused by the rolling amount of the upper and lower parts of the formed material as shown in Fig. 3.
The inventor has found through experiments that the larger the difference between h ₁ and h ₂ , the more pronounced it becomes, and that a similar tendency exists in the DC motors 32 and 38 that roll the rim portion.

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

In other words, the deformation behavior of the material is extremely complex when rolling a disc-shaped material using general-purpose rolls such as web rolls to create cross-sections, and the actual state of the material is not even understood. The reality is that it is not. Because of this complex deformation behavior,
Conventional calculation control of DC motor rotation speed was not sufficient.

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, resulting in a situation where rolling had to be stopped.

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

[Means for solving problems]

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and the present invention distributes the power required for rolling (motor load) by each motor at an arbitrarily set distribution ratio or by each driving rolling roll. In order to control the rotational speed of motors other than the reference drive roll motor so that the distribution ratio determined in consideration of the rolling force is applied, the central part of the disc-shaped material is
Upper and lower center shafts clamp the disc-shaped material from below and provide rotational drive to the disc-shaped material, and
Upper and lower web rolls that are rotationally driven to roll and form the web surface of the disc-shaped material, which are arranged between the bottom and can move in the radial direction and the vertical direction of the disc-shaped material, and the disc-shaped material. A disc-shaped material having upper and lower rim rolls that are arranged to sandwich the material from above and below and are movable in the radial direction and vertical direction of the same disc-shaped material and are rotatably driven to roll and form the rim surface of the same disc-shaped material. A method for controlling a roll rolling mill for raw materials, in which the rotational drive loads of the upper and lower center shafts, upper and lower web rolls, and upper and lower rim rolls are detected during rolling and forming, and these detected values are added to calculate the total rotational drive load. Multiply this by the preset load distribution ratio to each rotational drive mechanism of the upper and lower center shafts, upper and lower web rolls, and upper and lower rim rolls, and calculate the multiplication value for the rotational drive mechanism and the rotation during rolling forming. The load of each rotary drive mechanism other than the rotary drive mechanism of the upper and lower center shafts is adjusted so that the drive load matches the drive load, and the load distribution ratio to each rotary drive mechanism is adjusted so that the upper (lower) ) Load distribution ratio of the center shaft rotation drive mechanism = Upper (lower) Rated value or overload allowable current value of the center shaft rotation drive mechanism / Total of the rated value or overload allowable current value of each rotation drive mechanism Upper (lower) Load distribution ratio of the web roll rotation drive mechanism = Total of the rated value or overload allowable current value of the rotation drive mechanism of the upper and lower web rolls/Total of the rated value or overload allowable current value of each rotation drive mechanism × Upper (lower) web Roll rolling force / Total rolling force of upper and lower web rolls Load distribution ratio of upper (lower) rim roll rotation drive mechanism = Total rated value or overload allowable current value of upper and lower rim roll rotation drive mechanism / Rating of each rotation drive mechanism or the sum of the allowable overload current values x the rolling force of the upper (lower) rim roll/the sum of the rolling forces of the upper and lower rim rolls.

[Effect]

According to the present invention configured as described above, each DC motor (rotation drive mechanism) is By appropriately setting the load distribution ratio in a well-balanced manner and controlling the actual load of each DC motor during rolling to match the set load, each DC motor effectively acts as rolling power, Interruption of rolling due to load exceeding the allowable value can also be avoided.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 shows one embodiment of the present invention.
The same parts as those in the figures are given the same reference numerals and explanations will be omitted. In the figure, 11, 15, 21, 33, 39 are DC motors 10, 14, 20, 32, 3, respectively.
8 is a detector for detecting the load, 51 is a motor load distribution ratio setting device, 50 is a detector 11, 15, 21, 3
3, 39, and add this value to each DC motor 10, 14, 2.
This is a motor center shaft calculation comparator that multiplies 0, 32, and 38 by the set load distribution ratio and compares this multiplied value (load control value) with the actual detected load value, and the formula shown below is DC motors 14, 20, 32, 38 other than the reference DC motor 10 are controlled by a control device (not shown) so that the
The load is controlled.

I _CS = β _CS・(iCS+iWU+iWL+iRU+iRL)…1) I _WU =β _WU・(iCS+iWU+iWL+iRU+iRL)…2) I _WL =β _WL・(iCS+iWU+iWL+iRU+iRL)…3) I _RU =β _RU・(iCS+iWU+iWL+iRU+iRL)…4) I _RL =β _RL・(iCS+iWU+iWL+iRU+iRL)…5) However, when β _CS + β _WU + β _WL + β _RU + β _RL = 1, I _CS : Control value of DC motor 10 (A) I _WU : 〃 14 〃 (A) I _WL : 〃 20 〃 (A) I _RU : 〃 32 〃 (A) I _RL : 〃 38 〃 (A) β _CS : Load distribution ratio β _WU of DC motor 10: 〃 14 〃 β _WL : 〃 20 〃 β _RU : 〃 32 〃 β _RL : 〃 38 〃 i _CS : 〃 10 load detection value (A) i _WU : 〃 14 〃 (A) i _WL : 〃 20 〃 (A) i _RU : 〃 32 〃 (A) i _RL : 〃 38 〃 (A) To explain with a simple example, now,
β _CS = 0.5, β _WU = β _WL = 0.15, β _RU = β _RL = 0.1, i _CS
=
100(A), i _WU = i _WL = 50(A), i _RU = i _RL = 30(A), I _CS = 130(A), I _WU = I _WL = 39(A), I _RU = I _RL
= 26 (A), the load on DC motor 10 remains at 100 (A), and the load on DC motors 14 and 20 is increased to 50 (A).
(A)→30(A), the load of DC motors 32 and 38 is 30(A)→
It is controlled so that it becomes 20(A).

Naturally, if the upper and lower web rolls or the upper and lower rim rolls are not involved in rolling or are not driven, the above 1) to
5) Only the corresponding part in the formula becomes 0.

The reason why the DC motor 10 was used as a reference is that it is always involved in rolling from the start of rolling of the formed material A to the end of rolling, and that a large-capacity motor can be used due to the structure of the device. by.

In the above explanation, the motor load distribution ratio is set by the setting device 51.
However, the present invention also proposes a method of automatically setting the motor load distribution ratio.

That is, in FIG. 1, 52 and 53 are rolling force detectors that detect the vertical rolling force (P _WU , P _WL ) of the upper and lower web rolls 4 and 5, respectively, and 54 is the upper and lower web rolls 4 and 5. A rolling force detector 55 detects the radial rolling force (P _WH ) of 52,
Based on the detected values from 53 and 54, the DC motor 14,
Motor load distribution ratio between 20 α _WU =P _WU +・P _WU /P _WU +P _WL・P _WH /P _WU +P _WL +P _WH …6
) α _WL = 1 − α _WU …7) Here, α _WU : Load distribution ratio of DC motor 14 (upper web roll 4) α _WL : Motor for calculating the load distribution ratio of DC motor 20 (lower web roll 5) Load distribution ratio calculator, 56, 57
are rolling force detectors 58 that detect the vertical rolling forces (P _RU , P _RL ) of the upper and lower rim rolls 7 and 8, respectively;
is the DC motor 3 based on the detected values from 56 and 57.
Motor load distribution ratio between 2 and 38 α _RU = P _RU / P _RU + P _RL …8) α _RL = 1 − α _RU …9) Here, α _RU : Load distribution ratio of DC motor 32 (upper rim roll 7) α _RL : A motor load distribution ratio calculator that calculates the load distribution ratio of the DC motor 38 (lower web roll 8). (required in advance) are respectively A _CS , A _WL , A _RU , and A _RL , then
Each motor load distribution ratio calculator 59 calculates the load distribution ratio as shown in the following formula.

β _CS =A _CS /A _CS +A _WU +A _WL +A _RU +A _RL …10) β _WU =A _WU +A _WL /A _CS +A _WU +A _WL +A _RU +A _RL・α _WU …11
) β _WL =A _WU +A _WL /A _CS +A _WU +A _WL +A _RU +A _RL・α _WL …12
) β _RU =A _RU +A _RL /A _CS +A _WU +A _WL +A _RU +A _RL・α _RU …13
) β _RL =A _RU +A _RL /A _CS +A _WU +A _WL +A _RU +A _RL・α _RL …14
) The validity of setting the load distribution ratio based on the rolling force in this way is as described below.

That is, during actual rolling, on the formed material 1A,
It is also required to make a difference in the degree of pressure applied to the lower web surface (h ₁ , h ₂ in Fig. 3). For example, in order to make h ₁ > h ₂ , the downward rolling force by the upper web roll 4 must be Since it needs to be larger than the upward rolling force by the lower web roll 5, it can be considered from the theory that the torque arm is proportional to the square root of the processing amount, the torque is proportional to the rolling forming force and the torque arm, and the load is proportional to the torque. This is because, of course, the loads required for the motors 14 and 20 that drive the upper and lower web rolls 4 and 5 are different.

Moreover, the reason why the load distribution ratio of the DC motor 10 is set as shown in equation 10 is because the DC motor 10
This is because the structure of the device allows for the use of a large-capacity motor, which bears much of the driving force required for rolling and forming the material 1A, thereby reducing the load range of other DC motors. .

In addition, since minute errors etc. occur during actual rolling, the formulas 1) to 14) above are set in a form that can be corrected by multiplying an appropriate coefficient (usually 1.0), and used in experiments etc. It is better to multiply by the correction coefficient obtained from the result.

Furthermore, if the present invention is combined with the conventional control method described above, which is a rotational speed calculation control method in which the rotational speed of a DC motor is controlled, efficient control that prevents wear and tear on the drive rolls is also possible.

That is, a function is provided to determine whether the roll driven by the DC motor to be controlled is rolling, and while rolling is performed, the load calculation control method and the rotation speed calculation control method are used together, and the roll is The rotation speed calculation control method is used while the engine is not running.

To explain with reference to FIG. 1, the rolling force of the upper and lower web rolls 4 and 5 is measured by a rolling force detector 5
2 and 53, and from this detected value, a determining device 60 determines whether or not the upper web roll 4 and the lower web roll 5 are respectively rolling.

On the other hand, the rolling forces of the upper and lower rim rolls 7 and 8 are also detected by rolling force detectors 56 and 57, respectively, and based on the detected values, a determining device 60 determines whether the upper rim roll 7 and the lower rim roll 8 are respectively performing rolling. Determine. Based on these judgment results, if the roll to be controlled is rolling using a control mode switch (not shown in the diagram), 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 performed, the method is switched to the 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. This means driving the DC motor at its permissible rotational speed.

In FIG. 1, as described above as a conventional control method, the allowable limit calculator 61 adds a coefficient γ to the rotation speed calculated by the control rotation speed calculator 48 based on the position, dimensions, reference rotation speed, etc. of each roll. The maximum allowable rotation speed is calculated by multiplying the number, and this calculated value is compared with the detected value of the rotation speed of each DC motor using the rotation speed comparator 49. If the detected value is less than the calculated value, load calculation control is performed as is. implement. The detected value is greater than or equal to the calculated value,
That is, if the permissible limit is exceeded, the DC motor is controlled to be driven at the maximum permissible rotation speed.

According to the above control method, when starting rolling,
In other words, when rolling down the roll material 1A, rotation speed calculation control is carried out, so the circumferential speed of the material and the roll are almost the same, minimizing the impact between the material and the roll. It also prevents the DC motor from running out of control even if the roll does not properly engage the material, that is, slips, during load calculation control. It is possible to prevent wear and tear on rolling and drive rolls.

Further, FIG. 2 shows a roll rolling machine for rolling a material 1B having holes, and 3A in the figure is a roll for rolling the inner diameter surface of the material 1B, which is attached to the lower center shaft 3. The present invention is also applicable to the rolling of such a formed material 1B with holes, and the present inventor has found that the same effect as applied to the above-mentioned formed material 1A without holes is obtained. This has been confirmed through experiments.

〔Effect of the invention〕

FIG. 5b shows an example of the effects of the present invention.

FIG. 5b shows the DC motor 10 and the DC motor 1.
4. Set the load distribution ratio of the DC motor 20 to 0.30:0.45:
Load of each motor when controlled to 0.25 (indicated by drive horsepower H _CS , H _WU , H _WL in the figure)
As is clear from the comparison with the detected value of the conventional rotation speed calculation control (Fig. 5a), by applying the present invention, both DC motors can be used as rolling power. It can be seen that the process can be made to work effectively and that the disc-shaped material can be rolled smoothly and efficiently.

In fact, in rolling experiments to which the present invention was applied, it was possible to smoothly roll a disc-shaped material without causing the drawbacks of conventional methods such as overloading one of the DC motors and having to stop rolling. It was possible to roll efficiently.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a roll rolling mill according to an embodiment of the present invention, Fig. 2 is a block diagram of a roll rolling mill for a perforated disc-shaped material, and Fig. 3 is an explanatory diagram of a disc-shaped stock. , Fig. 4 is a configuration diagram of a conventional roll rolling mill, and Fig. 5 is a block diagram of a conventional roll rolling mill.
The figures are graphs of changes in driving horsepower of the center shaft and web roll, where a shows the result when the conventional control method is used, and b shows when the control method of the present invention is used. 1A...Disc-shaped material, 2, 3... Center shaft, 4, 5... Web roll, 7, 8... Rim roll.

Claims (1)

[Scope of Claims] 1. Upper and lower center shafts that clamp the center of the disc-shaped material from above and below and provide rotational drive to the disc-shaped material, and the disc-shaped material from above and below. The upper and lower web rolls, which are rotatably driven to roll and form the web surface of the disc-shaped material, are placed between them and are movable in the radial direction and vertical direction of the disc-shaped material.・A disc-shaped blank, which is equipped with upper and lower rim rolls that are rotationally driven to roll and form the rim surface of the disc-shaped blank, which are arranged between the bottom and are movable in the radial direction and the vertical direction of the disc-shaped blank. A method for controlling a roll rolling mill for a material, the method comprising controlling the above-mentioned upper and lower center shafts, upper and lower web rolls during rolling forming,
Detect each rotational drive load of the upper and lower rim rolls, calculate the total rotational drive load by adding these detected values,
This is multiplied by the preset load distribution ratio to each rotational drive mechanism of the upper and lower center shafts, upper and lower web rolls, and upper and lower rim rolls, and this multiplication value for each of the rotational drive mechanisms is combined with the rotational drive during rolling forming. 1. A method for controlling a roll rolling mill for a disc-shaped material, comprising adjusting the load of each rotational drive mechanism other than the rotational drive mechanism of the upper and lower center shafts so that the load matches the load. 2. A method for controlling a roll rolling mill for a disc-shaped material as set forth in claim 1, wherein the load distribution ratio to each of the rotation drive mechanisms is determined by the load distribution ratio of the upper (lower) center shaft rotation drive mechanism. Ratio = Rated value or overload allowable current value of the rotational drive mechanism of the upper (lower) center shaft / Sum of the rated value or overload allowable current value of each rotational drive mechanism Load distribution ratio of the upper (lower) web roll rotational drive mechanism = Total rated value or overload allowable current value of the rotational drive mechanism of the upper and lower web rolls / Total rated value or overload allowable current value of each rotational drive mechanism × Lowering force of the upper (lower) web roll / Total of the rated value or overload allowable current value of the upper and lower web rolls Total rolling force Load distribution ratio of the upper (lower) rim roll rotation drive mechanism = Total of the rated value or overload allowable current value of the upper and lower rim roll rotation drive mechanisms / Total of the rated value or overload allowable current value of each rotation drive mechanism × Rolling force of upper (lower) rim roll/total rolling force of upper and lower rim rolls.