JP5867067B2 - Method and apparatus for cutting strip material - Google Patents

Description

  The present invention relates to a strip material cutting method and apparatus, and is particularly suitable for use in cutting a shape steel using a gauge stopper type sawing facility when manufacturing a shape steel such as an H-shaped steel or a steel sheet pile. The invention relates to a method and an apparatus for cutting a strip.

  In a section rolling line such as H-section steel or steel sheet pile, as illustrated in FIG. 1, the rolled material 8 extracted from the heating furnace 10 is sequentially transported on the transport table 12 in the mill line, for example, in a breakdown ( BD) Rough rolling is performed by a roughing mill 14 at the front and rear stages such as a rolling mill, intermediate rolling is performed by an intermediate rolling mill 16 such as an intermediate universal rolling mill and an edging rolling mill, and finish rolling is performed by a finishing rolling mill 18 such as a finishing universal rolling mill. Then, it is sawed to a predetermined length by a hot sawing equipment (referred to as a hot saw) 20. The hot saw 20 has a predetermined target cutting length for an ordered product between the longitudinal end and the tail end of the product 8 ′ set according to the order by the upper computer 50 for sawing operation management for each product 8 ′. It is controlled by the hot saw control device 48 so as to become (order length). The predetermined length is a length assigned to the product 8 ′ of the rolled material 8 with priority on yield.

  As a basic method of sawing, for example, in the case of a hot saw 20 using a gauge stopper method as shown in FIGS. 2 and 2 described in Patent Documents 1 and 2, a plurality of (four in the figure) stoppers 26 are slide bases. 24, the gauge stopper 22 held so as to be movable up and down is moved in the longitudinal direction of the product 8 ′ within a certain range by automatic position control (APC) for gauge positioning, and a fixed saw 30 and stopper as a cutting means There is a method in which one of the stoppers 26 is selected and lowered so as to have a sawing length between the leading end of 26 and the stopped product 8 ′ is pressed by pressing the leading end against one of the stoppers 26. In the figure, 34 is a conveying table in the hot saw 20, 36 is its table roller, 40 is a measuring roll for tracking the conveying position of the product 8 ', 42 is its pulse transmitter, and 44 is a saw. It is a clamping device for clamping, for example, the side portion of the product 8 ′ when it is cut.

JP 2001-259926 A JP 2003-266108 A

  However, in the sawing method as described above, the moving amount of the gauge stopper 22 is not proportional to the sawing length, and the moving direction of the gauge stopper 22 is reversed at the change of the stopper 26 to be selected, and an error due to backlash occurs. There was a shortage of product length.

  In order to eliminate backlash, the gauge stopper 22 is temporarily returned to the reference position once every time or when the opposite direction movement is required so that the movement direction of the gauge stopper 22 during positioning is constant. However, there is a problem that when the one-way APC is performed, it is necessary to move the gauge stopper 22 excessively, and it takes time to control the position, and the processing time becomes longer than the product conveyance time.

  The present invention has been made to solve the above-mentioned conventional problems, and has a high accuracy with no influence of backlash due to reversal of the moving direction of the gauge stopper in a short position control time without performing one-way APC. An object is to enable cutting.

In the present invention, a gauge stopper having a plurality of stoppers is moved within a predetermined range in the longitudinal direction of the strip, and one of the stoppers is selected so that a target cutting length is set between the fixed cutting means and the stopper. When the cutting length is set in the cutting method of the strip that cuts the cutting target that is stopped by pressing the tip of the cutting target against the stopper, the amount of movement from the reference position of the gauge stopper at each target cutting length is calculated. In addition, the cutting order is rearranged in the order in which the moving direction is constant and the moving amount is small , and the elapsed time until cutting according to the cutting order determined by the rearrangement is calculated, and the cutting target according to the elapsed time until the cutting is calculated. In consideration of changes in length due to temperature changes , the above problem is solved by performing movement amount calculation and rearrangement of the cutting order again .

The present invention also includes a gauge stopper having a plurality of stoppers and movable within a predetermined range in the longitudinal direction of the strip, and a fixed cutting means, and the gauge stopper is moved within the predetermined range in the longitudinal direction of the strip. In the strip cutting apparatus for cutting the cutting object, which selects one of the stoppers so that the target cutting length is between the cutting means and the stopper and presses the tip of the cutting object against the stopper The means for calculating the amount of movement of the gauge stopper from the reference position at each target cutting length when performing the cutting length setting, and the rearrangement for rearranging the cutting order in the order in which the moving direction is constant and the moving amount is small. means and, means for calculating an elapsed time until the cutting by the cutting order determined by the sorting means, to account for changes due to the temperature change of the length of the cutting object by the elapsed time until the cutting again moved By providing a cutting device for strip material characterized by comprising a re-sorting means for cutting the order of rearranging the amount calculated, and is obtained by solving the above problems as well.

  According to the present invention, since the cutting order in which the moving direction is constant is selected in consideration of the position of the gauge stopper, the moving direction of the gauge stopper can be achieved in a short position control time without performing one-way APC. It is possible to perform cutting with high accuracy without the influence of backlash due to the inversion of.

Schematic showing the overall configuration of an example of a section rolling line A perspective view showing an example of a gauge stopper type hot saw The block diagram which shows the structure of the hot saw control apparatus for implementing this invention The flowchart which shows the process sequence of embodiment of this invention The figure which similarly shows the example of change of cutting order

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 3, the hot saw control device 48 for implementing the present invention receives each piece of information from the host computer 50 shown in FIG. 1, and in accordance with the output of the measuring roll 40 shown in FIG. A table roller driving device 38 for driving the table roller 36 shown in FIG. 2, a gauge stopper driving device 28 for driving the gauge stopper 22 shown in FIG. 2, a clamp driving device 46 for driving the clamping device 44 shown in FIG. A controller 52 is provided that sends output to a hot saw drive device 32 that drives the saw 30 shown in FIG.

  Hereinafter, the processing procedure of the present embodiment will be described with reference to FIG.

  First, in step S100, the in-product order length OLi is extracted. Here, for example, OL1 = 20 m, OL2 = 18 m, OL3 = 16 m, and OL4 = 10 m.

Next, in step S110, the movement amount Li of the gauge stopper 22 for realizing the order length is calculated using the following equation.
Li = (OLi-a)% b (1)

  Here, a is a reference position of the gauge stopper 22 (for example, 10 m), b is a distance between the stoppers (for example, 3 m), and% is a remainder operator (corresponding to mod such as Excel (registered trademark)) used in the C language. is there.

  In the case of the above example, the amount of movement of the slide base 24 of the gauge stopper 22 for simply cutting the OL 1 by stopping the tip of the product 8 ′ with the fourth stopper (hereinafter referred to as the fourth stopper) counted from the reference position (simply) As shown in FIG. 5, L1 is 1 m, as shown in FIG. 5, and is a movement for cutting the OL2 by stopping the tip of the product 8 'with a third stopper (hereinafter referred to as a third stopper) counted from the reference position. The amount L2 is also 2 m, and the movement amount L3 for cutting the OL3 by stopping the tip of the product 8 ′ with the second stopper (hereinafter referred to as the second stopper) counted from the reference position is also 0 m, on the reference position. The movement amount L4 for cutting the OL 4 by stopping the tip of the product 8 ′ with a certain first stopper (hereinafter referred to as the first stopper) is also 0 m.

  In step S120, the cutting order (the cutting order in the embodiment) is changed in ascending order of the movement amount Li. For example, the first cut is OL3 with L3 = 0 m, the second cut is OL4 with L4 = 0 m, the third cut is OL1 with L1 = 1 m, and the fourth cut is OL2 with L2 = 2 m.

Thereafter, when the product length change caused by the temperature drop due to the elapsed time until cutting becomes a problem as in the case of hot sawing, the process proceeds to step S130, and the elapsed time ti until sawing is calculated.
ti = reference time + saw time × number of times of sawing (2)
Here, the reference time is the time until the first cutting, and the sawing time is the time required for one sawing.

Next, the process proceeds to step S140, and the corrected movement amount Li ′ is recalculated by the following equation including the elapsed time ti obtained in step S130.
Li ′ = (OLi × α × ti−a)% b (3)

  Here, α is a hot correction coefficient representing a change in length of the product 8 ′ per unit time and unit length.

  In this example, L3 ′ = 0.235 m, L4 ′ = 0.095 m, L1 ′ = 1.234 m, and L2 ′ = 2.234 m.

  Next, the process proceeds to step S150, in which the sawing is replaced again in the order of the smaller movement amount Li ′ after correction, the first cut is OL4 = 10 m, the second cut is OL3 = 16 m, the third cut is OL1 = 20 m, the fourth The cutting is set to OL2 = 18 m, and the setting of the sawing order is completed.

  In the case of sawing in the order of the order length OLi according to the conventional method, the first cut and the second cut are directions in which the movement amount increases, and the third cut and the fourth cut are directions in which the movement amount decreases. Finally, it can be seen that rearrangement has been made in the direction in which the gauge stopper movement amount monotonously increases.

In the embodiment, the gauge stopper having four stoppers is used, but the number of stoppers is not limited to this. Further, application target is not limited to hot saw sectional, not limited to the rotation saw disconnecting means. Furthermore, the object to be cut is not limited to the shape steel, and can be applied to strips in general.

DESCRIPTION OF SYMBOLS 8 ... Rolled material 8 '... Product 20 ... Hot saw 22 ... Gauge stopper 24 ... Slide base 26 ... Stopper 28 ... Gauge stopper drive device 30 ... Saw 32 ... Hot saw drive device 34 ... Transport table 36 ... Table roller 38 ... Table roller drive device 44 ... Clamping device 46 ... Clamp driving device 48 ... Hot saw control device 50 ... Host computer 52 ... Controller

Claims (2)

A gauge stopper having a plurality of stoppers is moved within a predetermined range in the longitudinal direction of the strip, and one of the stoppers is selected so that the distance between the fixed cutting means and the stopper is a target cutting length, and the tip to be cut In the cutting method of the strip material that cuts the cutting object stopped by pressing against the stopper,
When setting the cutting length, calculate the amount of movement from the reference position of the gauge stopper at each target cutting length , rearrange the cutting order in order of the moving direction is constant and the moving amount is small ,
Calculate the elapsed time until cutting according to the cutting order determined by the rearrangement, consider the change due to the temperature change of the length of the cutting target due to the elapsed time until the cutting, and re-order the movement amount and rearrange the cutting order A method of cutting a strip characterized in that A gauge stopper that has a plurality of stoppers and can move within a predetermined range in the longitudinal direction of the strip,
A fixed cutting means,
The gauge stopper is moved within a predetermined range in the longitudinal direction of the strip, and one of the stoppers is selected so that the target cutting length is between the cutting means and the stopper, and the tip of the object to be cut is pressed against the stopper. In the strip cutting device for cutting the object to be cut,
Means for calculating the amount of movement from the reference position of the gauge stopper at each target cutting length when setting the cutting length;
Rearrangement means for rearranging the cutting order in the order in which the movement direction is constant and the movement amount is small;
Means for calculating an elapsed time until cutting according to the cutting order determined by the sorting means;
Considering the change due to the temperature change of the length of the cutting object due to the elapsed time until the cutting, re-sorting means for performing the movement amount calculation and the cutting order again,
A strip cutting apparatus characterized by comprising:

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