JPH0751719A - Method for finely adjusting rolling thickness of thin metal sheet and device therefore - Google Patents

Abstract

PURPOSE:To improve the rolling precision of a thin metal sheet by adjusting the strain of the rolling stand. CONSTITUTION:In a method to obtain a rolled article with a prescribed thickness by feeding a metal stock into rolling rolls 1, 2 and adjusting the clearance between rolling rolls, this method adjusts the amount of elastic strain of the rolling stand and finely adjusts the thickness of articles. Vertical grooves 14 are provided inside connecting columns 12 between a base plate and a top plate 10 of the rolling stand which keeps holding bearing parts 3, 4 of the rolling rolls, and hydraulic devices to add the extension elastic strain to the connecting columns are installed inside the vertical grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for finely adjusting the rolling thickness of a thin metal sheet for the purpose of improving the rolling precision of the thin metal sheet.

[0002]

2. Description of the Related Art Conventionally, the thickness of a rolled product is adjusted by rotating a reduction screw based on the detected value of the product thickness.

Further, the applicant has previously proposed a method of setting the roll gap of a rolling roll, calculating the deviation between this set value and the measured value of the roll gap, and controlling the roll gap by the output (special feature). Kaihei 5-15922).

[0004]

According to the conventional adjustment, the rolling roll has bending elastic strain and shear elastic strain, and does not necessarily change in direct proportion to the rolling force.

Regarding the bearing of the rolling roll, there are various strains between bearing members such as elastic strain of the roller bearing.

Next, regarding the screw down screw, since there are various strains between the screws and the two screw down screws do not have the same strain characteristic, the strain amount with respect to the load is not necessarily directly proportional.

Further, the rolling stands do not have the same material properties on the left and right, but exhibit different bending properties depending on the load.

As described above, when the reduction screw is finely adjusted, each part such as the rolling roll, the bearing member including the roller bearing, the reduction screw, and the rolling stand has a unique strain amount depending on the rolling characteristics. There is a problem that it is extremely difficult to finely adjust the product thickness, particularly the thickness in the width direction.

Notwithstanding the above-mentioned problems, it has become more and more required to control the thickness of rolled products.

According to the above conventional thickness control, the thickness is 0.5
A thickness of about 0.005 mm could be controlled for a metal plate of mm or less. However, when a thickness accuracy of about ± 0.001 mm is required, there is a problem that the conventional control method cannot achieve the purpose.

Next, in the prior art, an invention in which the elongation and strain of the rolling stand are also measurement factors (Japanese Patent Laid-Open No. 5-159).
No. 22) is a different control method in which the material characteristics of the rolling stand are also partially considered, but the distortion of the rolling rolls and roller bearings is not considered.

[0012]

However, according to the present invention, since the rolling precision is adjusted by adjusting the strain of the rolling stand, it is possible to reduce the distortion of the rolling screw, the rolling roll, the roller bearing, and the like which conventionally change with the load. Based on this, it becomes possible to adjust the total pressing force, which enables high-precision thickness control in the rolling of thin metal regardless of the above-mentioned conventional problems.

That is, the invention of the method is a method of feeding a metallic material between rolling rolls to obtain a rolled product having a predetermined thickness by adjusting the gap between the rolling rolls, in which the elastic strain amount of the rolling stand is adjusted to adjust the product thickness. Is a fine adjustment method for the rolling thickness of a thin metal plate. Further, the invention of another method is characterized in that the adjustment of the elastic strain amount of the rolling stand is given a predetermined amount of extension strain in advance, and the product thickness is finely adjusted by increasing or decreasing the extension strain amount. The adjustment of the elastic strain amount of the rolling stand is characterized by imparting extension strain to the rolling stand and finely adjusting the product thickness.

Next, the invention of the apparatus is to provide a vertical groove in the connecting column between the base of the rolling stand and the top plate for sandwiching the bearing portion of the rolling roll, and to provide a hydraulic device for imparting an elongation elastic strain to the connecting column in the vertical groove. Is a fine adjustment device for rolling thickness of a thin metal plate.

The invention of another device is a hydraulic device comprising a hydraulic cylinder, a hydraulic piston fitted therein, and a push-up rod connected to the hydraulic piston.

The strain of the rolling stand in the above is set to a predetermined strain in advance, and the strain amount is reduced at the time of adjustment.
There is a case in which pressurized oil is fed into the hydraulic cylinder at the time of adjustment to give a predetermined amount of strain without providing a strain in advance, but either can be adopted.

The groove (hydraulic cylinder accommodating groove) provided in the rolling stand may be a through groove or a non-through groove.

The adjusting screw in the rolling stand can be employed manually or electrically.

As shown in FIG. 3, it is preferable that the hydraulic cylinders according to the present invention are arranged at equal intervals with four rolling rolls sandwiched therebetween in a well-balanced manner.

The pressures of the hydraulic cylinders and the rolling stand described above have the following relationship.

In the case of p ₁ + p ₂ = P ₀ p ₃ + p ₄ = P ₁ , if P ₀ = p ₁ , the horizontal up / down minute movement is performed. If P ₀ <P ₁ , the upper right tilt movement P ₀ > P ₁ If reverse tilt

In FIG. 3, reference numerals 20 and 20 are pressure regulating valves.

[0023]

That is, according to the present invention, since the amount of vertical strain of the rolling stand is adjusted, the thickness of the product can be adjusted with high accuracy regardless of the strain of the rolling roll, roller bearing, reduction screw, and the like. .

[0024]

Example: Four front and rear connecting columns 11 and 12 connecting bases 7 and 8 of rolling stands 5 and 6 sandwiching bearings 3 and 4 of rolling rolls 1 and 2 and top plates 9 and 10, respectively. From the side
Grooves 14 for accommodating the hydraulic cylinders 13 are provided vertically, and the hydraulic cylinders 13 are accommodated in the respective grooves 14. One end of the piston rod 16 is fitted into each of the hydraulic cylinders 13, one end of the push-up rod 15 is connected to the other end of the piston rod 16, and the other end of the push-up rod 15 is connected to the groove 1
It is in contact with the top wall of No. 4.

In the above embodiment, in order to roll the metal material 17, when the metal material 17 is fed from the direction of the arrow 18 and the reduction screw 19 is tightened by a predetermined amount, the screwing portion of the reduction screw 19, the lower end abutting portion, and the bearing. The box 20, the roller bearing, the rolling rolls 1, 2 and the like are distorted according to the load amount. Therefore, when 0.2 mm of the feed material is rolled to 0.149 mm, in order to adjust this to 0.150 mm, a predetermined amount of pressurized oil is fed into the hydraulic cylinder 13, and the connecting column 11,
12 is extended in the direction of arrows 21 and 21, and the rolling force of the rolling roll 1 is adjusted. For example, by feeding pressurized oil, the piston rod 16 is pushed out, and the push-up rod 15 pushes up the top plates of the rolling stands 5 and 6 with a force of 1 to 2 tons. In this case, the connecting columns 11 and 12 of the rolling mill are slightly elongated, and the rolling force of the rolling roll 1 is slightly reduced, resulting in a product thickness of 0.150 mm.

In the above, the connecting column 1 is used when adjusting the thickness.
Although 1 and 12 are elongated, the rolling force of the rolling roll 1 can be adjusted by previously extending the connecting columns 11 and 12 and reducing the amount of extension.

In the conventional adjustment of the reduction screw 19, even if it is attempted to adjust it to 1 micron, the materials such as the rolling rolls 1 and 2 and the roller bearings are not directly proportional to the reduction force. On the contrary, there is a possibility that the balance may be lost, and it is extremely difficult to accurately adjust the fine thickness.

For example, when rolling with rolling rolls 1 and 2, 1
Even if you try to adjust the thickness of the micron, the amount of change is 10
It became difficult to adjust 1 micron when the size became from micron to 5 micron. However, with the adjustment by the hydraulic cylinder 13, it was possible to make an adjustment of about 1 micron.

[0029]

According to the present invention, the rolling forces of the left and right rolling stands are disturbed under a balanced condition without being affected by distortions of the rolling rolls, roller bearings, rolling screws and the like. Since the thickness of the rolled product can be finely adjusted without adjusting, the adjustment accuracy of the thin metal plate is about 1 micron.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view in which the same is partly cut away.

FIG. 3 is a plan view showing a relational position between a rolling roll and a hydraulic cylinder.

[Explanation of symbols]

 1, 2 Rolling rolls 3, 4 Bearings 5, 6 Rolling stands 7, 8 Bases 9, 10 Top plates 11, 12 Connecting columns 13 Hydraulic cylinders 14 Grooves 15 Push-up rods 16 Piston rods 19 Rolling screws

Claims (5)

[Claims] 1. A method for obtaining a rolled product having a predetermined thickness by feeding a metallic material between rolling rolls and adjusting the gap between the rolling rolls, and finely adjusting the product thickness by adjusting the elastic strain amount of the rolling stand. A method for finely adjusting the rolling thickness of a thin metal sheet, which comprises: 2. The thin sheet according to claim 1, wherein the elastic strain amount of the rolling stand is adjusted by applying a predetermined amount of extension strain in advance and finely adjusting the product thickness by increasing or decreasing the extension strain amount. Fine adjustment method of rolling thickness of metal sheet. 3. Fine adjustment of the rolling thickness of the thin metal plate according to claim 1, wherein the elastic strain amount of the rolling stand is adjusted by imparting extension strain to the rolling stand to finely adjust the product thickness. Method. 4. A vertical groove is provided in a connecting column between a base of a rolling stand and a top plate sandwiching a bearing portion of a rolling roll, and a hydraulic device for imparting extension elastic strain to the connecting column is provided in the vertical groove. An apparatus for finely adjusting the rolling thickness of a thin metal plate, which is characterized in that 5. The rolling thickness fine adjustment device for a thin metal plate according to claim 4, wherein the hydraulic device is a hydraulic cylinder, a hydraulic piston fitted into the hydraulic cylinder, and a push-up rod connected to the hydraulic piston.