JPH0639622A - Side trimming method for metal strip - Google Patents

Abstract

PURPOSE:To improve the quality of the trimmed surface shape by setting an appropriate clearance and overlap without the influence of the line speed and the line length of a trimming line. CONSTITUTION:The optimal clearance quantity of an upper blade 4 and a lower blade 5 in relation to the edge plate thickness is obtained previously per each material of a metal strip 1, and the optimal overlap quantity of the upper blade 4 and the lower blade 5 in relation to the edge plate thickness is obtained. The cutting control signal is given to a side trimmer so as to obtain the optimal clearance quantity and the optimal overlap quantity on the basis of the edge plate thickness information, the order final plate width information and the material of the metal strip in the last process, in which the metal strip is originated, and out of consideration of the edge plate thickness, which is measured or predicted in a travelling line of the metal strip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for side trimming a metal strip, and more particularly to a method for side trimming which is effective under conditions where the line length of a final inspection line of a cold rolled steel sheet is short.

[0002]

2. Description of the Related Art Conventionally, as a method of side trimming a metal strip, there is a method disclosed in, for example, Japanese Patent Laid-Open No. 62-213916 or Japanese Laid-Open Patent Publication No. 2-292114.

In the former case, when side trimming a metal strip running on a trimming line by a side trimmer, the plate width of the metal strip is measured by a plate width meter installed on the upstream side of the side trimmer. The plate width deviation is calculated from the plate width difference between the trimming setting plate width and the trimming setting plate width, the plate thickness of the trimming portion is predicted based on this plate width deviation, and the clearance and overlap are set for each steel type based on the predicted plate thickness. It is disclosed that the value is obtained and the set values of the clearance and the overlap are changed to the obtained value.

On the other hand, in the latter case, in the method for trimming a metal strip without burr, the thickness of the metal strip is planned to be cut by a thickness gauge installed on the inlet side and the outlet side of the side trimmer. It is disclosed that the total plate thickness at the cutting point is measured and the clearance and the overlap between the upper blade and the lower blade in the side trimmer are feedback-controlled.

[0005]

However, in the former case, after the plate width of the metal strip is measured by the plate width meter installed on the upstream side of the side trimmer, the above-mentioned measurement is performed before the metal strip reaches the side trimmer. Since the plate width must be calculated to change the clearance and overlap settings, the response to the line speed (trimming followability) becomes poor, and the line speed and line length of the trimming line are restricted. Therefore, when the line length is short, it is difficult to optimize the shape quality of the end surface of the plate edge by trimming.

In addition to the responsiveness, the plate thickness is a predicted value based on the plate width deviation, and the clearance and the overlap are set based on the predicted plate thickness.
These clearances and overlaps do not have proper values, and the quality of the trim end surface is adversely affected.

On the other hand, also in the latter, the plate thickness is measured by a plate thickness meter installed on the inlet side and the outlet side of the side trimmer,
Since the clearance and the overlap are feedback-controlled, the responsiveness to the line speed becomes a problem as in the former case, and the line speed and the line length of the trimming line are restricted.

Therefore, in each of the above-mentioned conventional techniques, the trimming conditions, that is, the setting of the clearance and the overlap are easily influenced by the line speed and the line length of the trimming line, and it is difficult to obtain a trim product having a good and stable trim end face shape.

Therefore, a main object of the present invention is to set an appropriate clearance and overlap without being affected by the line speed and line length of the trimming line to improve the quality of the trim end face shape.

[0010]

[Means for Solving the Problems] The above-mentioned problem is, when side trimming a continuously running metal strip by a side trimmer, determines the optimum clearance amount between the upper blade and the lower blade with respect to the edge plate thickness for each material of the metal strip. In addition to obtaining in advance, the optimum overlap amount of the upper blade and the lower blade with respect to the edge plate thickness is also obtained in advance regardless of the material of the metal strip, and the edge plate thickness information and order in the previous process from which the metal strip originates Based on the final plate width information and the material of the metal strip, and by measuring or predicting the edge plate thickness on the running line of the metal strip to obtain the optimum clearance amount and the optimum overlap amount without being based on this. Can be solved by giving a disconnection control signal to the side trimmer.

[0011]

The present invention is based on the edge plate thickness information in the previous process from which the metal strip is derived, without measuring or predicting the edge plate thickness on the running line of the metal strip. Therefore, for example, when the metal strip is carried into the travel line, a disconnection control signal can be given to the side trimmer so that the optimal clearance amount and the optimal overlap amount can be obtained. There is sufficient time to perform the changing operation, and the line length is not restricted.

Further, regarding the clearance, the clearance condition is changed according to the material of the metal strip, so that an appropriate clearance can be set.
As a result, the quality of the trim end surface shape can be improved regardless of the trimming section (normal trimming or burr-free trimming).

As will be described later, when the strip centering control is performed and the inlet side plate thickness is measured and the clearance and the overlap are controlled based on the measured thickness, the centering control is performed. Along with
It is difficult to stabilize the shape quality of the trimming end face because the trimming condition needs to be controlled in real time in response to the entry side plate thickness value changing every moment.

However, according to the present invention, the control is not based on the thickness plate on the measurement entrance side, but is based on the edge plate thickness information in the previous step from which the metal strip is derived, and therefore depends on the centering control. Without
Trimming with stable shape quality of the end face can be performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the embodiments shown in the drawings. FIG. 1 is a view showing an example of an apparatus for carrying out the method of the present invention. Reference numeral 1 is a metal strip running on a trimming line, and side trimmer bodies 3 and 3 are arranged on both sides of the metal strip 1 in the width direction. Each of these side trimmer main bodies 3 and 3 has an upper blade 4 and a lower blade 5 as a pair.

The upper blade 4 and the lower blade 5 are separated from each other with a predetermined clearance in the width direction of the strip 1 and are opposed to each other with an overlapping amount left and right in the vertical direction. Both sides of the strip 1 are trimmed as trimming portions 2 and 2. In addition, 11 is a fin masher for polishing and removing the return portion.

In such side trimming, the clearance and the overlap between the upper blade 4 and the lower blade 5 of the side trimmer 3 have a great influence on the shape quality of the trim end surface, so that it is an important issue to set appropriate conditions. Becomes Therefore, in the present invention, the side trimming of the metal strip 1 is performed in the following manner.

First, the optimum clearance amount (C / t) between the upper blade 4 and the lower blade 5 with respect to the edge plate thickness (t) for each material of the metal strip is obtained in advance, and regardless of the material of the metal strip, The optimum overlap amount (OR) of the upper blade 4 and the lower blade 5 with respect to the edge plate thickness (t) is also obtained in advance, and these are tabulated and input to the data file of the process computer 7.

Further, a pre-process from which the metal strip 1 is derived, for example, a continuous annealing line, a continuous plating line,
In any step of the temper rolling line or the like, the edge plate thickness of the metal strip 1 is actually measured by a plate thickness meter (not shown), and this edge plate thickness information A is input to the host business computer 13. In addition to the edge plate thickness information A, the host business computer 13 has trim setting width (order plate width) information B as trimming setting conditions.
Is input, and the information A and B are transmitted to the process computer 7 at an appropriate time, for example, when the metal strip 1 is loaded into the line.

The process computer 9 selects a clearance and an overlap corresponding to the metal strip 1 from a data file that has been tabulated in advance, and the clearance setting actuator 9 and the overlap setting actuator 10 are selected via the microcomputer 8.
To control the clearance and the overlap between the upper blade 4 and the lower blade 5 in the side trimmer body 3.

The edge plate thickness can usually be defined as a plate thickness at an arbitrary point P within 50 mm from the outermost edge portion. At this arbitrary point P, the trim setting width B and the base metal plate width are set. T can be determined by the following expression (1). P = (T−B) / 2 (1) Further, regarding the edge plate thickness A, for example, three points of the edge plate thickness at the top portion, the middle portion, and the bottom portion of the metal strip 1 are measured, respectively. Use the average value. Alternatively, it may be an average value of N pieces at constant intervals of the coil length.

In the present invention, the clearance is set by the relationship between the edge plate thickness and the steel type, and an example of the setting will be described with reference to FIGS. FIG. 5 shows the definition in the case of evaluating the shape quality of the trim end surface. The present inventors have found that the clearance amount (C / t) between the upper blade 4 and the lower blade 5 with respect to the edge plate thickness (t) and the sagging amount t1. When the fracture surface angle θ3 and the shear surface rate t1 were examined for each steel type, the results shown in FIGS. 2 to 4 were obtained.

In the figure, ● mark indicates steel type A, trim product with a plate thickness of 1.6 mm, and ○ mark indicates steel type B, trim product with a plate thickness of 0.8 mm. The plate thickness in this case means a nominal value.

As shown in FIGS. 2 to 4, as the ratio of the clearance to the edge plate thickness increases, the amount of sag (t
1), the fracture area angle (θ3) shows a tendency to gradually increase, and conversely, the shear section ratio (t2) decreases. Therefore, for steel type A, the edge plate thickness is 5%, and for steel type B, the edge plate thickness is 5%. 10% of the thickness was applied as clearance.

On the other hand, the overlap is set only in relation to the edge plate thickness regardless of the steel grade, and is set within the range of 20% of the edge plate thickness.

Under the above set conditions, when a large number of strips having various steel grades and edge plate thicknesses were actually trimmed, good trim end face shape quality was obtained in each case. Therefore, as in the conventional example,
It was confirmed that the trimming condition corresponding to the metal strip is extracted from the relations tabulated in advance and the side trimming is performed without performing feedback control.

On the other hand, according to the present invention, the side trimming can be performed without being affected by the strip centering control. In this centering control, as shown in FIG. 6, a light source 20 and a light receiver 21 including a CCD image sensor or the like positioned relative to the line center are provided on both sides of the metal strip 1, and each light receiver 2
The universal amplifier 22 amplifies the detected position signal of the side edge of the strip 1 by the Nos. 1 and 21, outputs the deviation signal to the moving coil 23, and the electro-hydraulic controller 24 outputs a correction signal according to the deviation to the pay-off reel. It is carried out by feeding it to the operating cylinder 25 (not shown). This causes strip 1 to be aligned with the line center in real time. As described above, in the present invention, based on the information in the previous step from which the metal strip 1 is derived,
Since trimming is performed, proper trimming can be performed without being affected by centering.

[0028]

As described above, according to the present invention, since the proper clearance and overlap can be set without being affected by the line speed and line length of the trimming line, the quality of the trim end face shape can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a diagram showing a relationship between a clearance and a sagging amount.

FIG. 3 is a diagram showing the relationship between clearance and fracture surface angle.

FIG. 4 is a diagram showing a relationship between clearance and shear rate.

FIG. 5 is an explanatory diagram showing a definition of shape quality of a trim end surface.

FIG. 6 is a schematic explanatory diagram of an example of centering control.

[Explanation of symbols]

1 ... Metal strip, 2 ... Trimming part, 3 ... Side trimmer body, 4 ... Upper blade, 5 ... Lower blade, 6 ... Upper vidicon,
7 ... Process control, 8 ... Microcomputer, 9 ... Clearance setting actuator, 10 ... Overlap setting actuator, 11 ... Fin masher.

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[Procedure amendment]

[Submission date] August 11, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

However, in the present invention, the control is not based on the thickness plate on the measurement entrance side, but is based on the edge plate thickness information in the previous process from which the metal strip is derived, so that it is not affected by the centering control. It is possible to perform stable trimming of the shape quality of the end face.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

In the present invention, the clearance is set by the relationship between the edge plate thickness and the steel type, and an example of the setting will be described with reference to FIGS. FIG. 5 shows the definition in the case of evaluating the shape quality of the trim end surface. The present inventors have found that the clearance amount (C / t) between the upper blade 4 and the lower blade 5 with respect to the edge plate thickness (t) and the sagging amount t1. When the fracture surface angle θ3 and the shear surface rate t2 were examined for each steel type, the results shown in FIGS. 2 to 4 were obtained.

Claims (1)

[Claims] 1. When side trimming a continuously running metal strip by a side trimmer, an optimum clearance amount between an upper blade and a lower blade with respect to an edge plate thickness is previously obtained for each material of the metal strip, and the metal strip is also obtained. Regardless of the material used, the optimum amount of overlap of the upper and lower blades with respect to the edge plate thickness is also obtained in advance, and the edge plate thickness information, the final ordered plate width information, and the metal strip in the previous process from which the metal strip comes Cutting control for the side trimmer so as to obtain the optimum clearance amount and the optimum overlap amount based on the material of the metal strip and without measuring or predicting the edge plate thickness on the running line of the metal strip. A method of side trimming a metal strip, which is characterized by giving a signal.