JPS60124427A - Controlling method of rolling mill - Google Patents

Abstract

PURPOSE:To form a blank section to a prescribed shape by detecting and calculating a force in the material diameter direction of a pair of web rolls and an outside diameter part side roll, and controlling automatically the force of one or both by its difference or ratio, in case of web rolling of a discoid section. CONSTITUTION:As for a discoid blank section OA, a boss part is formed to a prescribed shape by a center shaft 1, web rolls 2, 3 and notches A1, A2 by cylinders 12, 17. A web part is formed by movement A3 in the material diameter direction of the web rolls 2, 3 by a cylinder 22, and a pressure by a cylinder 21 of an outside diameter part side roll 4, and an outer ring part is formed to a prescribed shape and size by a detector 23. In that case, the pressure of the cylinders 21, 22 is detected by detectors 25, 26, 31 and 32, compared with a value of a setting device 45, the cylinders 21, 22 are operated so that its difference or ratio becomes a set value, and automatic control 37 is executed. By this automatic control, the section OA is formed to a prescribed ring provided with webs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the rolling force of a roll rolling mill for a two-disk shaped material.

The roll rolling mill to which the present invention is applied is, for example, the roll mill proposed by the present inventors in JP-A-54-102277.

This roll rolling mill has 9 inner diameter parts of disc-shaped material.

The outer diameter portion, web portion, and rim portion are each formed using rolls. Alternatively, it is a roll rolling mill that forms the outer diameter portion, web portion, and rim portion of a disc-shaped material using rolls, and there are no known examples of a method for controlling this type of rolling mill.

The present invention relates to an inner diameter part and an outer diameter part of a disc-shaped raw material.

In a roll rolling mill that forms the web portion and the rim portion using rolls, the rolling force acting on the inner diameter portion of the 9-disk shape can be arbitrarily adjusted.

This has the effect of efficiently and smoothly rolling the inner diameter portion of the disc-shaped material.

On the other hand, in a roll rolling mill that uses rolls to form the outer diameter portion, web portion, and rim portion of a 9-disc shaped material, the force to press and support the boss portion of the 9-disc shaped material is reduced. This has the effect of preventing defects (insufficient thickness) occurring in the pressure support portion.

The present invention will be explained in detail with reference to the following two drawings.

Figure 1 shows an example of a disc-shaped material to be rolled by a roll rolling mill to which the present invention is applied, and 8 in 9 is a perforated disc-shaped material with a large hole in the center. Each shows an example of a disc-shaped material without holes.

The perforated disc-shaped material has a rim portion 01. Web part 02゜re1
In the figure, the symbol d is the inner diameter, t is the wall thickness, and D is the outer diameter.

jo is the wall thickness of the boss portion 08, am is the average diameter of the hole, and the disc-shaped material is the rim portion 01. Web part 02° Boss part 08. Outer diameter portion 05 (consisting of

First, a case will be described in which the present invention is applied to a roll rolling mill for forming a perforated disk-shaped material. (See FIG. 2) The mandrel roll 1 forms the inner diameter part 04 of the perforated disc-shaped blank OA (hereinafter referred to as blank #OA).

The mandrel roll 1 is connected to a rotary drive machine (not shown) via a speed reducer 18, and is mounted on a fixed frame 19.

The web roll 2 rolls one side of the web portion 02 of the formed material OA, and the web roll B rolls the other side.

The web rolls 2 and 8 are connected to rotary drives to and 15 via bearing boxes 9 and 14, respectively, and are connected to a moving base 1.
It is attached to 1.16.

The moving base 11.16 has a web roll housing 18,
The screws are movably mounted in the interior and are rolled down in the directions of arrows AI and A2 by rolling down devices 12 and 17 attached to the fixed frame +9, respectively.

The web part roll housing is moved by the hydraulic cylinder 22 in the direction of arrow A8. Therefore web roll 2
, 3 with arrow AI, A2. . . . By applying the movements of A8, the web portion 02 of the formed material OA can be rolled.

The side rolls 4 and 5 are used in pairs and are rotatably mounted in a bearing box 8 by a hydraulic cylinder 21 attached to a fixed frame 19.

The wall thickness t of the raw material OA during rolling is reduced in the direction of the arrow Bl.
As for the increase, move in the direction of arrow B2 while keeping the pressed down state. In addition, in the case of rolling to reduce the wall thickness t of the formed material OA, it moves in the direction of the arrow Bl. The position detection device 23 detects the amount of movement of this side roll.

The outer diameter portion 05 is formed by rolling down the formed material OA in the radial direction of the side rolls 4 and 5. The rim roll 6 rolls one side of the rim portion 01 of the formed material OA, and the rim roll 7 rolls the other side. Although the rim rolls 6 and 7 are not shown, they are configured to be driven and moved in the same way as the web rolls 2 and 8.

The detection device 24 contacts the outer diameter portion o5 of the OA of the raw material,
As the outer diameter of the material OA changes, the position of the detection roll that moves in the radial direction is also detected.

The present invention is carried out in the roll rolling mill as described above as follows.

The acting force in the radial direction of the formed material OA of the side rolls 4 and 5 is determined by detecting the pressure on the rod side and the anti-rod side of the hydraulic cylinder 21 with the pressure detection ends 25 and 26, respectively. 27 and 28, the operating force is calculated by the upper computing unit 29, one acting force is expressed as a vector, and the signal is sent to the higher computing unit 8o.

On the other hand, the force acting in the radial direction on the formed material OA of the web rolls 2 and 8 is determined by detecting the pressure on the rod side and the anti-rod side of the hydraulic cylinder 22 at the pressure detection ends 81 and 32, respectively, and the detected pressure is as follows. After calculations are performed on the pressure reduction forces of the respective calculation units 88 and 84, the acting force is calculated by the higher-order calculation unit 85, and the acting force is expressed as a vector, and then the applied force is calculated by the higher-order calculation unit 8o.
signaled to.

A calculator 80 calculates the force for pressing the material OA against the mandrel roll l, and a controller 86 compares the calculated value with a control value set in the setting device 45.

If the calculated value is outside the allowable range of the control value, the control device 86 will issue a command to increase or decrease the pressure on the opposite rod side of the hydraulic cylinder 21 using a pressure increase/decrease device (not shown), and the calculated value will be controlled. Control the pressure until the value is within the allowable range.

It should be noted that it is well understood that the hydraulic cylinder that controls pressure here is not limited to the hydraulic cylinder 21.

On the other hand, in order to explain the present invention, various arithmetic units are used independently.
Although the calculation functions are all performed by the control device 8,
6 can also be held.

The force for pressing the material OA against the mandrel roll 1 is controlled by one or both of the following methods.

PM = ps - Pw = KK,...Song...
......(1) PM=';'F=K2...
...... Song... Pause (2) However.

PM: Force of pressing the material OA against the mandrel roll 1 Ps: Force of the side rolls 4 and 5 pushing the material OA against the mandrel roll PW: Force of the side rolls 4 and 5 pushing the material OA against the mandrel roll PW: Force of the side rolls 4 and 5 pushing the material OA against the mandrel roll The force Kl to pull away from the mandrel roll 1 is 2: Control value, that is, when the force pressing the material OA against the mandrel roll 1 is controlled to a constant value, Ps and Pw
When controlling Ps or Pw or both forces so that the difference in O force matches the control value Kl, on the other hand, when controlling the force pressing the material OA against the mandrel roll 1 by the ratio of Ps and PwO force. controls Ps or Pw or both forces such that the ratio of the forces of Ps and Pw matches the control value to 2.

FIGS. 5 and 6 show examples of the effects of the present invention when a formed material is rolled by the roll mill shown in FIG. 2 to which the present invention is applied.

The control applied here is to control the force pressing the material OA against the mandrel roll 1 to a constant value, and Figure 5 shows the shape during rolling when the control value is set large. The enlargement of the inner diameter d and outer diameter of the material is shown, and FIG. 6 shows the case where the control value is set small.

In FIG. 5, in which the control value is set to a large value, it can be seen that both the outer diameter 'D and the inner diameter d of the formed material increase with rolling.

On the other hand, in FIG. 6 where the control value is set to a small value, it can be seen that the outer diameter of the formed material increases with rolling, but the inner diameter d hardly changes.

This suggests that rolling of the inner diameter portion 04 of the formed material can be freely controlled by arbitrarily setting the control value to an appropriate value.

The present invention proposes the following control.

The inner diameter dimension d of the material OA being rolled is continuously detected and calculated, and after this calculated value reaches a predetermined value, the force pressing the material OA against the mandrel roll 1 is increased by the inner diameter d. The force is controlled to the extent that it is rolled.

An embodiment will be explained with reference to FIG.

The position of the side roll is detected by the side roll position detection device 28, and the detected value clearly shows the geometric relationship between the roll 1 and the side rolls 4 and 5. The thickness t of the formed material OA is calculated by the calculator 87 from the outer diameter dimension value.

On the other hand, the position detection device 24 of the detection roll 20.

The position of the detection roll 20 is also detected, and from this detection value the geometrical relationship position of the mandrel roll 1 and the detection roll 20 is clear. υ Average diameter d of inner diameter d and outer diameter of raw material OA
Calculate m.

From the inner thickness t and average diameter dm calculated above.

The upper computing unit 39 computes the inner diameter d of the silicon material OA,
The control device 86 compares the control value of the inner diameter dimension d set by the setting device 45, and if the calculated value is smaller than the control value by 1, the rolling is continued as it is and the function that controls the force by the calculated value f is used. ii) The force that does not expand the inner diameter of the formed material OA by rolling 41 times, that is, the contact surface pressure between the sill roll 1 and the formed material OA, is approximately ii. The deformation resistance is controlled to be below the deformation resistance value.

This control value is easily determined from known rolling theory and data on the deformation resistance of various materials under high temperatures. good.

FIG. 7 shows another embodiment of the invention.

In this example, P
s < pw・・・・・・・・・・・・・・・・・・
This is a case where the relationship shown in (3) is controlled, and by implementing this control, the wall thickness to of the boss part can be freely adjusted. A Kf2 that can be rolled to:
:Ru.

That is, as is clear from FIG. 2, the web roll 2.
When rolling the inner diameter portion 04 on the 8 side with the mandrel roll 1, there is a range in which the wall thickness io of the boss portion cannot be rolled due to the geometrical relationship between the web rolls 2, 8 and the mandrel roll 1. The control method 1 shown in FIG. 7 solves this problem and has great effects.

The roll rolling mill shown in FIG. 8 has one side roll 40, sender rolls 41 and 42 are arranged on both sides of the side roll, and guide rolls 4 are arranged on both sides of the rim roll.
Although the present invention is a roll rolling mill equipped with 8.44, it can be fully understood from the detailed description of the present invention that the present invention is also applicable to this roll rolling mill.

FIG. 9 shows an example in which the present invention is applied to a roll rolling mill for rolling a holeless disk-shaped material OB (hereinafter referred to as Keishi material OB).

This roll rolling mill differs from the roll rolling mill for rolling the formed material OA shown in FIG. 2 only in the center shaft 49.degree. 50, and the functions and structures of the other rolls are the same.

The web part 02 of the formed material OB is rolled by a web roll 2°8 while being supported under pressure between center shirts) 49.50, and the outer diameter part 05 is rolled by side rolls 4 and 5 (not shown). The rim portion O1 is rolled by a rim roll 6.
7.

The present inventor conducted a rolling experiment using a roll rolling mill having the roll arrangement shown in FIG. 9, and found that the application of the present invention has significant effects.

In other words, if a rolling experiment is conducted without applying the present invention, the formed material O supported under pressure between the center shafts 45 and 46 during rolling and when the web rolls 2 and 8 are also released.
B moved due to the force exerted by the side rolls 4.degree. 5, and pressure support was no longer carried out at the center of the formed material OB, making it impossible to perform normal rolling. To deal with this problem, the pressure support force was increased, and as shown in FIG. ．． A concave underfill was generated in 48.

This lack of thickness is caused by the acting stress occurring in the pressurized support portions 47, 48 of the formed material OB, the axial compressive stress due to the center shirt 49.50, the radial compressive stress due to the side rolls 4 and 5, or the web roll. The radial tensile stress and the like due to No. 2 and No. 3 act in a complex manner and are compounded.

It is known that in such a stress field, deformation occurs at a value smaller than the deformation resistance value of the formed material OB at the temperature during rolling. A large concave underfill occurs.

If the control method of the present invention is applied, center shirt) 49.
Since the radial force of the formed material OB acting on the center shafts 49 and 50 can be controlled arbitrarily, the frictional force of the pressure support parts 47 and 48 necessary for transmitting the rotational driving force of the center shafts 49 and 50 is ensured. It is sufficient to pressurize and support the formed material OB with the minimum necessary pressing force to the extent that

As a result of carrying out a rolling experiment by applying the control method 7 of the present invention, it was confirmed that rolling could be carried out normally without causing almost any concave underfill in the pressure support portions 47 and 48.
It was confirmed that the application of the present invention is highly effective.

As described above, by using the control method of the present invention, both a perforated disc-shaped material and a perforated disc-shaped material can be rolled accurately and efficiently.

As can be easily understood from the above-mentioned detailed description, the control method of the present invention is applicable to at least one of the mandrel roll that rolls the inner diameter surface of the formed material or the center shaft that presses and supports the boss portion of the formed material. A roll having side rolls or similar rolls so that the outer diameter surface of the formed material absorbs the force in the radial direction of the formed material generated by the μ-roll while rolling the web part. This can be applied to any net machine.

[Brief explanation of drawings]

FIG. 1 shows an example of a disk-shaped material to be rolled by a roll mill to which the present invention is applied. FIG. 2 shows an explanatory diagram of the main parts of a roll rolling mill for a perforated disk-shaped material to which the present invention is applied, and an example of a rolling force control system diagram in the radial direction of the material. FIG. 8 shows the arrangement of the 'rolls constituting the roll mill of FIG. 2. FIG. 4 is a diagram explaining the control method of the present invention. FIG. 5 and FIG. 6 are diagrams explaining the present invention in detail. FIG. 7 is a diagram illustrating another embodiment of the control method of the present invention. FIG. 8 is a diagram illustrating that the present invention can be applied to roll rolling mills with different roll arrangements. FIG. 9 1 shows an example of the roll arrangement of a roll rolling mill for a holeless disc-shaped material to which the present invention is applied. - FIG. 10 is a diagram showing the effect of applying the present invention. -Figure 1 Figure 2 River 1 Figure 3 Figure 5 Pressure proof @ between (5ec) AIfB! 3 blocks (Sf'r) Figure 7 6 8g A 9th port 10th arrangement

Claims (1)

[Scope of Claims] 1. A pair of upper and lower web rolls that move and roll at least the web portion of the formed material among the rolls constituting the roll production machine in a disc-shaped material roll rolling mill. ,
One or two side rolls that form the outer diameter part of the material are controlled, and the force in the radial direction of the material is generated by the web roll while rolling the material. The force in the radial direction of the raw material generated by the side roll while rolling the raw material is compared with the detection calculation, and the difference or ratio of the force is determined by either the web roll or the side roll, or A control method for a roll rolling mill for disc-shaped material, characterized in that both forces are controlled to arbitrary values by automatically adjusting them. 2. In a disc-shaped material roll rolling mill in which a mandrel roll for forming the inner diameter part of a disc-shaped material is arranged at a fixed position, at least the material is The web roll for forming the web portion and the side roll for forming the outer diameter portion of the material are pressed against the mandrel roll in a direction perpendicular to the axis thereof, and the force is released. Continuously detect the force acting on the mandrel roll, and use this detected value to apply force to the mandrel roll in a direction perpendicular to its axis. By calculating and synthesizing the force vectors acting through the raw material and automatically adjusting the rolling blade of the side roll that forms the outer diameter part of the raw material based on the calculated value. 2. The method of controlling a roll rolling mill according to claim 1, wherein the force acting on the mandrel roll to press the formed material is arbitrarily controlled. 8. Continuously detects the inner diameter of the disc-shaped material being rolled.
After the detected and calculated value reaches a predetermined value, the force applied to the mandrel roll that forms the inner diameter of the material to press the material is reduced to a level that does not cause the inner diameter to expand. In other words, the patent is characterized by having a function of controlling the contact pressure between the mandrel roll and the formed material to be approximately equal to or less than the deformation resistance value at the temperature during rolling of the formed material. A method for controlling a rolling mill according to claims 1 and 2. 4. In a roll rolling mill for disk-shaped blanks in which a seven-point shaft is fixed to pressurize and support the boss portion of the disk-shaped blank, at least one of the other roll groups constituting the roll rolling machine is A web roll that forms the web part of the material,
The side rolls that form the outer diameter part continuously detect the force acting on the Santa shaft in a direction perpendicular to its axis through the formed material, and from this detected value, the center shaft 2. Compute and synthesize the vectors of forces acting through the material in a direction perpendicular to its axis, and then form the outer diameter part of the material based on the calculated values. Roll rolling according to claim 1, characterized in that when the rolling blades of the side rolls are automatically adjusted, the balance deviation value of the force acting on the center shaft is arbitrarily controlled. How to control the machine.