JPS6154484B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a roller leveler. A typical example of a conventional roller leveler is shown in FIG. The roller leveler 1 includes a pair of pinch rolls 2 and a plurality of leveler rolls 3 arranged in a staggered manner.
It is made up of. Pinch roll 2 is a motor
M ₁ and each roll 3 is simultaneously driven by one motor M ₂ through a gear box 4. Pinch roll 2 and leveler roll 3 may be driven by one motor. The pinch roll 2 serves to feed the material, and in the case of a reciprocating leveler, is provided on the entrance/exit side of the leveler roll. The leveler roll 3 is usually supported by several rows of backup rolls (not shown) to compensate for deflection. The amount of reduction (relative biting amount of the upper and lower rolls) can be set separately for the entry and exit sides, and leveling is performed with tilting. The flatness defects of rolled steel strips can be roughly classified into shape defects and warpage defects. Shape defects are caused by differences in longitudinal elongation of the material, and cannot be corrected unless plastic elongation is imparted to the material. Roller levelers are designed to correct warpage defects (particularly warpage in the longitudinal direction) and reduce residual stress, so their ability to correct shape defects is low.
In order to give plastic elongation to a material with a roller leveler, it is necessary to actively apply axial force. With conventional roller levelers, the residual stress within the material and the frictional force generated between the roll and the material only act as a slight axial force, and basically they cannot impart plastic elongation, and their ability to correct shape defects is low. . Furthermore, a camber that bends significantly in the longitudinal direction occurs in the rolled steel strip. Conventional roller levelers cannot correct camber. The principle of camber correction is to either stretch the curved inner side more than the outside, or change the direction of movement of the material and bend it in the opposite direction to the camber. Therefore, an object of the present invention is to provide a roller leveler capable of correcting warpage defects, shape defects, or camber of rolled steel strips. The roller leveler of the present invention divides a large number of leveler rolls into two or more groups, and makes a difference in the circumferential speed of the rolls in each group to generate axial force on the material and improve shape correction ability. Accordingly, the rolls of at least one of these groups are configured to be tiltable in a horizontal plane or in a vertical plane or in both directions with respect to the material surface to correct the camber. The basic structure of the roller leveler of the present invention will be explained below, taking as an example a structure divided into two groups shown in FIG. The roller leveler 1 of the present invention has almost the same structure as the conventional leveler shown in _FIG .・
box 41 and motor _M3 and gear box 42, respectively. Therefore, the rollers of groups A and B are each driven separately. For leveling, the circumferential speed of the rolls of group A on the upstream side in the direction of movement of the material is set to be smaller than the circumferential speed of the rolls of group B on the downstream side. Preferably, motor M ₂ may be stopped so that all rolls of group A are not driven. Furthermore, it is preferable that the diameter of the low circumferential speed or non-driven roll is smaller than the diameter of the high circumferential speed roll. This is effective in imparting strong bending and generating large axial force. Further, if necessary, the work rolls 3 of at least one of the groups A and B may be tilted at an inclination angle α (a third angle) in a horizontal plane with respect to the surface of the material.
It is constructed so that it can be tilted at an angle of inclination β (FIG. 4) in a vertical plane. The roll tilt in the horizontal plane is preferably performed for each group A and B, and the roll tilt in the vertical plane is preferably performed for group A. When tilting the roll 3 in the vertical plane, the fourth
As shown in the figure, the relationship between the inclination angle β and the reduction amount difference δ is expressed by the following equation, where W is the width of the material. δ=W tanβ As a modification of the roller leveler of the present invention, as shown in FIG.
A configuration in which two levelers are provided and the peripheral speeds of the rolls of both levelers are different, or a configuration in which non-driven roller levelers 1a and 1b are provided on the inlet side of the conventional reciprocating roller leveler 1, as shown in FIG. You can also take In order to generate plastic elongation by applying axial force to the material, for example, as shown in FIG. Pull it out. The results of the leveler pulling experiment in this way are shown in the first
Shown in the table. In this experiment, the diameter of the leveler roll was
50mm, the number of pieces is 5, and the orthodontic material is 3mm thick and wide.
We used aluminum with a length of 250m and a length of 1500mm.
The results of this experiment are shown in FIG. Table 1 and 7
As shown in the figure, the shape defect (steepness λ) of the material has been successfully corrected.

【table】

[Table] Modification of the camber of the rolled material, as described above, involves tilting the leveler roll in the horizontal plane or in the vertical plane or in both directions. Figure 8 shows the experimental results when leveler rolls (diameter 50 mm x 11 rolls) were tilted in a vertical plane. Fig. 8 Reduction amount difference δ
(mm) is the inclination angle β in Fig. 4 as mentioned above.
Corresponds to (°). Roller leveler (diameter 60mm x 7, 2
FIG. 9 shows the experimental results when the roller 3 of the roller leveler 1B on the downstream side was tilted in the horizontal plane in the roller leveler 1B. As can be seen from FIG. 9, as the inclination angle α of the roller 3 in the horizontal plane increases, the camber amount ΔC increases. The camber amount ΔC in this case refers to the maximum amount of curvature for a material length of 5 m. Therefore, more effective camber correction can be achieved by tilting the leveler roll in the horizontal or vertical plane, respectively. Next, an embodiment of the roller leveler of the present invention will be described. Example 1 An aluminum cut plate was leveled using a roller leveler having the configuration shown in FIG. The diameter of the leveler rolls was 50 mm, and a total of 11 leveler rolls were used. When starting leveling of the cutting board, all levelers and
Drive roll 3. When the tip of the cutting plate advances to the middle part of the leveler group B, the motor _M2 driving the roll 3 of the leveler group A on the upstream side with respect to the material traveling direction is stopped. As a result, 0.15% plastic elongation occurred in the longitudinal direction of the cut plate, and the shape of the cut plate was significantly modified. Example 2 In the roller leveler of Example 1, the roll 3 of group A on the upstream side was set to have a reduction amount difference δ of 1 mm in the vertical plane with respect to the surface of the rolled material, and an inclination angle α of 1.0° in the horizontal plane. Set. At this time, a camber amount ΔC=3 mm/5 m occurred. Next, using the cut plate where this camber occurred as a material, I reset the reduction amount difference δ and the inclination angle α by the same amount in the opposite direction to the previous one, and then leveled again, and the camber mentioned above was corrected. Ta. Embodiment 3 In a roller leveler configured as shown in FIG.
Leveling was carried out on an aluminum cut plate with a thickness of 4 mm x width of 300 mm x length of 4000 mm. The roll diameter of roller leveler 1 was 70 mm, and nine rolls were used.
The roll diameters of the non-driven levelers 1a and 1b provided on the input and output sides of the roller leveler 1 were 30 mm at the top and 50 mm at the bottom, and five rolls were used. First, pass the cutting board to the right, and when the tip of the cutting board reaches the middle part of the roller leveler, leveler 1
A was strongly pressed down. It was impossible to measure the elongation when the leveler 1a was not used, but when the leveler 1a was used, an elongation of 0.3% was measured on the cut plate. Next, perform leveling to the left, leveler 1
While strongly pressing down b, roll the roll in the horizontal plane.
When the cutting board was tilted by 1.5°, camber occurred in the cutting board. In order to correct this camber, leveling is performed in the right direction, and the reduction amount difference δ = 1.5 is applied to the leveler 1a.
When mm was applied, the camber was almost eliminated. Next, medium elongation and ear wave shape defects with steepness λ = 3% were artificially formed on another rolling line, strong rolling was performed with leveler 1a, and leveling was performed by drawing with leveler 1. As a result, medium elongation and Both ear waves were resolved. In addition, when a pinch roll is provided between the levelers 1 and 1a or between the levelers 1 and 1b, more effective material feeding can be obtained. Example 4 In the roller leveler configured as shown in FIG.
Leveling of a lead cut plate with a thickness of 4 mm x width of 300 mm x length of 3000 mm was carried out. Each roller leveler 1A, 1
For B, the roller diameter was 60 mm and seven rolls were used. First, the levelers 1A and 1B were stopped with the cut plate being bitten by the levelers 1A and 1B, and then the rolls of the leveler 1B were tilted by 2.5° in the horizontal plane to forcibly give camber. Furthermore, the inclination angle α=
It was confirmed that the leveler 1B could be moved in the leveling direction and the cut plate could be stretched to give elongation, that is, the leveler could be used as a chuck mechanism when deforming the cut plate. Next, when passing through levelers 1A and 1B,
When leveling was carried out by increasing the peripheral speed of the roll of leveler 1B higher than that of leveler 1A and applying a tensile force to the cut plate, an elongation of 0.5% was obtained. Example 5 As shown in Fig. 10, levelers consisting of 13 pieces with a diameter of 100 mm are arranged into three groups A, B, and C, and motor _M2 is controlled ON and OFF.
M ₃ and M ₄ made it possible to control peripheral speed differences. Thickness 4mm×
When leveling an aluminum plate with a width of 500 mm and a length of 5000 mm, the motor of leveler group A is turned OFF when the tip of the cut plate leaves the center of leveler group B, and the peripheral speed of leveler group C is set to group B. It was confirmed that an elongation rate of 1% could be obtained by increasing the speed by 1.5%. Next, leveler groups A and C under the same conditions as above.
When the leveler was tilted 1.5 degrees in the horizontal plane, a camber of 5 mm/5 m occurred. Note that when leveling groups A, B, and C are leveled at the same speed, the plastic elongation will be 0 if the rolling reduction is small.
It was also confirmed that even if the rolling reduction was increased, the elongation could only be increased by about 0.05% at most. When the roller leveler of the present invention is applied to thick plates, hot-rolled materials for shear line levelers, etc., particularly effective flatness correction and camber correction can be achieved, and the yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional roller leveler.
FIG. 2 is a schematic diagram showing the basic configuration of the roller leveler of the present invention. FIG. 3 is an explanatory diagram showing the case where the leveler roll is inclined in a horizontal plane with respect to the surface of the material. FIG. 4 is an explanatory diagram showing the case where the leveler roll is inclined in a plane perpendicular to the surface of the material. Fifth
FIG. 6 is a schematic configuration diagram showing a modified example of the roller leveler of the present invention. Figure 7 shows the roller of the present invention.
A graph showing the results of a material pulling experiment using a leveler. FIGS. 8 and 9 are graphs showing the relationship between the reduction amount and inclination angle of the leveler roll and the camber amount. FIG. 10 is a schematic configuration diagram showing a modification of the roller leveler of the present invention. 1: Roller Leveler, 2: Pinch Roll,
3: Leveler roll, 4: Gear box.

Claims (1)

[Claims] 1. A plurality of leveler rolls arranged in a staggered manner, 2.
Divide into three or more groups, and each group's work and
A roller leveler that is configured to generate axial force on the material by creating a difference in the circumferential speed of the rolls. 2 Multiple leveler rolls arranged in a staggered manner
Divide into three or more groups, and each group's work and
Rollers configured to have different circumferential speeds of the rolls, generate axial force in the material, and tilt at least one work roll of the group in a horizontal plane, in a vertical plane, or in both sides with respect to the material surface. Leveler. 3. The roller leveler according to claim 1 or 2, wherein the work rolls of at least one of the groups are made non-driven. 4. Any one of claims 1 to 3, characterized in that the diameter of the work rolls in the low circumferential speed or non-driving group is smaller than the diameter of the work rolls in the driving group. Laura Revera mentioned.