JPH0739049B2 - Metal strip non-return side trimming method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-burr side trimming method for a metal strip in which burr does not occur when trimming both ends of the metal strip with side trimmers.

[Prior art]

Conventionally, as a non-burring side trimming method for metal strips, there is a method disclosed in, for example, JP-A-62-213916 or JP-A-62-282811. The former is such that the clearance and the overlap (amount of uncut portion) of the side trimmer blade are changed according to the detection value of the plate thickness gauge arranged on the entrance side of the side trimmer. The latter is a method in which a side trimmer is used to make notches in both ends of the metal strip, leaving uncut parts, and then the uncut parts are separated by pressing down with a wide roll from the vertical direction.

[Problems to be Solved by the Invention]

However, in the former case, since the plate thickness is detected only on the entrance side of the side trimmer, the clearance and the overlap of the side trimmer blade are not controlled by the feed back control, and there is a problem that the required accuracy is not obtained. Further, there is a problem that it is inefficient because the zero point setting work is required every time the side trimmer blade is replaced. At the trimming point, the plate thickness is smaller than that in the central portion (edge drop phenomenon) and the variation in the length direction of the plate is large, so that a defective return trimming operation is likely to occur.
There has not yet been proposed a trimming method that follows the change in the plate thickness at the trimming point and brings about a good cut surface shape over the front length of the strip. The present invention has been made in view of the above conventional problems, and it is possible to precisely control the feedback clearance of the clearance and the overlap amount of the side trimmer blades, and the zero point setting work at the time of replacing the side trimmer blades is not necessary. It is an object of the present invention to provide a non-burring side trimming method for a metal strip that effectively functions even in an edge drop portion where the thickness of the metal strip varies greatly.

[Means for Solving the Problems]

According to the present invention, when the side trimmer is used to make a cut so as to leave an uncut portion at both ends of the traveling metal strip, the plate thickness t ₁ and the side of the cut portion of the metal strip at the entrance side of the side trimmer are set. On the exit side of the trimmer, the total plate thickness t ₂ at the cut point is measured in the state where the cut is made by the side trimmer, and t ₂ = t ₁ (d _{1 to} d ₂ ) (d ₁ and d ₂ are metal The constant (1.5 or more and 1.9 or less) determined by the material of the strip) controls the overlap (amount of uncut portion) of the upper and lower blades in the side trimmer, and the clearance C between the upper and lower blades is − It is controlled so that 0.05 × t ₁ ≦ C ≦ 0, and the roll interval t ₀ = t on the exit side of the side trimmer.
₁ (1 + k) (k is a constant determined by the material of the metal strip and is 0 or more and 0.7 or less) is controlled by a push-back roll to pinch the cut portion in the plate thickness direction to separate the uncut portion. The above-mentioned object is achieved by a non-burring side trimming method of a metal strip.

[Action]

In the present invention, the plate thickness at the trimming point of the metal strip is measured before and after the side trimmer, the clearance of the side trimmer blade and the amount of overlap are controlled according to this plate thickness, and a cut is made leaving an uncut portion. Since both ends of the metal strip are clamped and separated by a push-back roll whose roll interval is controlled according to the plate thickness, the side trimmer blade clearance and the amount of overlap can be accurately fed back controlled. Zero point setting work is not necessary when replacing the trimmer blade, and it is possible to perform non-burring trimming even on the edge drop portion where the plate thickness varies.

【Example】

Hereinafter, operating conditions in which the method of the present invention is applied to a strip having a plate thickness of 0.7 mm and a low carbon steel will be described in detail with reference to the drawings. As shown in FIG. 1 to FIG. 3, the present invention, when making a cut so as to leave an uncut portion 12A at both widthwise ends of the metal strip 12 traveling by the side trimmer 10,
A state in which the plate thickness t ₁ at the planned cutting point of the metal strip 12 on the entrance side of the side trimmer 10 is measured by the entrance side plate thickness gauge 14 and a cut is made by the side trimmer 10 on the exit side of the side trimmer 10. The total plate thickness t ₂ at the cutting point at is measured with the outlet plate thickness gauge 16, and at t ₂ = t ₁ (d _{1 to} d ₂ ), d ₁ = 1.6, d ₂ =
1.8 is experimentally obtained, and the upper blade 10A and the lower blade 10B in the side trimmer 10 are set so that t ₂ = t ₁ (1.6 to 1.8).
Of the side plate thickness gauge at the exit side of the side trimmer 10 while controlling the overlap of the trimmer / roll controller 18.
Roll spacing for pushback rolls 20 placed after 16
The _{t 0 t 0 = t 1 (} 1 + k) [ in this steel type is k = 0.3 is obtained _{experimentally, t 0 = t 1 × 1.3} ] to, and controlled by the trimmer roll controller 18, and the upper The clearance C between the blade 10A and the lower blade 10B is controlled to be -0.05t _{1 to} 0, that is, -0.035 to 0mm, and the notch by the side trimmer 10 is pressed by the push-back roll 20 in the plate thickness direction. The non-returned side trimming of the metal strip is performed by separating the uncut portion 12A. The side trimmer 10 is arranged on both sides of the metal strip 12 in the width direction, and each of them is composed of an upper blade 10A and a lower blade 10B. The upper blade 10A and the lower blade 10B are appropriately spaced apart from each other in the width direction of the strip 12 (clearance), and are arranged to face each other with an overlapping amount left and right in the vertical direction. The clearance between the upper blade 10A and the lower blade 10B is set by the clearance changing actuator 22, and the overlap is set by the overlap changing actuator 24. The clearance changing actuator 22 and the overlap changing actuator 24 are controlled by the trimmer / roll control device 18. It is desirable that the distances between the thickness gauges 14 and 16 and the side trimmer 10 and between the thickness gauge 16 and the push-back roll 20 are close to each other. If the variation of the plate thickness t ₁ at the above distance is an obstacle to the implementation of this method, solve the problem by adjusting the control timing according to the speed measured by the plate speedometer 17. You can The trimmer / roll control device 18 includes the inlet side plate thickness gauge 14
The thickness signal t ₁ from the output side thickness gauge 16 and the total thickness t ₂ from the output side thickness gauge 16 are respectively input, and the trimmer / roll control device 18 receives these thickness signals t ₁ and t ₂ and the metal strip 12 input from the outside. From the constants d ₁ , d ₂ and k determined by the material of t ₂ , t ₂ = t ₁ (d ₁ ~
d ₂ ) −0.05t ₁ ≦ C ≦ 0 and t ₀ = t ₁ (1 + k) are calculated,
Based on this, as described above, the clearance changing actuator 22 and the overlap changing actuator 24
And, the push-back roll 20 is configured to control the amount of reduction through the actuator 20A. The action position of the push-back roll 20 is controlled to the side trimming position by the push-back roll position control actuator 25. Actually, as shown in FIG. 3, the plate thickness t ₁ at the place where the cut is made by the side trimmer 10 is measured by the entrance side plate thickness gauge 14 and the clearance C is set to −0.05 t ₁ based on this t _1. ~ 0
Substantially central point, in this example set to -0.017Mm, Obaratsupu (the thickness of the uncut portion 12A) t ₃ = (0.2~0.4) controlled to be t _1, and then exits measured in side thickness gauge 16 Measure the total plate thickness t ₂ at the cut point and use the trimmer / roll controller 18 to adjust the feed back to t ₂ = t ₁ + (t ₁ -t ₃ ) = t ₁ (1.6 to 1.8) t _1. Control. The _{C = -0.05t 1 ~0, t 3} = (0.2~0.4) t 1 and t ₂ =
The numerical value of (1.6 to 1.8) t ₁ was experimentally obtained by the present inventor, and within this range, side trimming could be performed without burr. The same applies to t ₀ = t ₁ (1 + 0.3). That is, when side trimming is performed in the relationship of t ₁ , C, t ₃ , t ₂ , and t ₀ described above, the side trimmer is changed according to the plate thickness of the metal strip 12.
Since the amount of overlap between the upper blade 10A and the lower blade 10B in 10 can be precisely feedback-controlled, it is possible to completely perform non-burring trimming of the edge drop portion with the plate thickness variation. Furthermore, zero point setting is not required when replacing the trimmer blade.

【The invention's effect】

Since the present invention is configured as described above, since the feed back control is precisely performed on the overlap of the trimmer blade, the zero point adjustment at the time of exchanging the trimmer blade does not require adjustment work, and
There is an excellent effect that trimming without burr of the edge drop portion having a variation in plate thickness can be performed fully automatically, and the trimming margin can be reduced to improve the yield.

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus for carrying out a burr-free side trimming method for metal strips according to the present invention,
FIG. 2 is a schematic side view of the apparatus, and FIG. 3 is a schematic sectional view showing a process of side trimming a metal strip by the method of the present invention. 10 …… side trimmer, 10A …… upper blade, 10B …… lower blade, 12…
… Metal strip, 12A …… Uncut part, 14 …… Inlet side thickness gauge, 16 …… Outside thickness gauge, 18 …… Trimmer roll control device, 20 …… Push back roll, 20A …… Actuator, 2
2 …… Actuator for changing clearance, 24 …… Actuator for changing overlap.

Claims (1)

[Claims] 1. When making a cut by a side trimmer so as to leave an uncut portion at both ends of a traveling metal strip, a plate thickness t _{1 at} a cut portion of the metal strip at the entrance side of the side trimmer and On the exit side of the side trimmer, the total plate thickness t ₂ at the cut point is measured in the state where a cut is made by the side trimmer, and t ₂ = t ₁ (d _{1 to} d ₂ ) (d ₁ and d ₂ are (A constant determined by the material of the metal strip) so that the overlap of the upper and lower blades in the side trimmer is controlled, and the clearance C between the upper and lower blades is -0.05 x t ₁ ≤
The cut-out portion is controlled by a push-back roll controlled so that C ≦ 0 and roll distance t ₀ = t ₁ (1 + k) (k is a constant determined by the material of the metal strip) on the exit side of the side trimmer. A non-burring side trimming method for a metal strip, characterized in that the uncut portion is separated by pinching in the plate thickness direction.