JP2567450B2 - Edge mirror cutting method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an edge mirror cutting method, and in particular, it is possible to determine an appropriate edge width by the edge mirror, which is suitable for application in the production of thick steel plates, and to provide a product having good linearity and width accuracy. The present invention relates to the improvement of the obtained edge mirror cutting method.

[Prior art]

Generally, the width of rolled steel sheet is not uniform,
It is necessary to shear the end face to adjust the width dimension. Therefore, for example, a side shear having a straight blade is used to shear the end of the thick steel plate. At the time of shearing by the side shear, as shown in FIG. 10 to 12% of t
is necessary. By providing this knife gear G of 10 to 12%, as shown in FIG. 9, it is possible to cut with a low shearing force. In FIG. 8, 11 is a steel plate 10 during shearing.
It is a crack that occurs inside. If this knife gear G is too small, as shown in FIG. 10, the direction of the crack 11 deviates more than the line connecting the knives 14 and 18, and the material between the line connecting the knives and the crack is further scraped off by the knife. So-called secondary shear is generated to become tongue 12, and secondary shear causes powder and whiskers,
Shear surface becomes poor. On the contrary, when the knife gear G is excessively large, not only the plate width after shearing becomes large, but also when the cutting edge bites, the material is easily drawn into this part, and a crack occurs. The line connecting both edges of the blade incline will be greatly inclined, the return will be large, and a beautiful sheared surface cannot be obtained. If a proper knife gear G is provided, cutting with a low shearing force is possible, but the plate width after shearing will vary within the range of the knife gear G as shown in Table 1 below. Table 1 shows the relationship between the plate thickness t and the cutting accuracy when cutting with the side shear, and the knife gear G is set to 12% of the plate thickness t. Further, the dimensional accuracy is marked with ±, and the variation thereof is substantially twice as large as that of the knife gear G because the left and right sides of the steel plate are cut by the side shears. Further, as shown in FIG. 11, the shear plane has a "return" in a "droop" in the direction of thinning of the plate and a "fracture surface" with large irregularities. Therefore, when manufacturing thick steel plates for which the plate thickness accuracy is becoming more and more stringent recently, there is a problem that if the edges are sheared, the plate width accuracy cannot be met. . On the other hand, the treatment with an edge mirror, which cuts the end surface of a workpiece with a rotating cutter, has begun to be used in ERW pipe processing plants, UO factories and the like, and in recent years, it is being applied to thick steel plate production lines. For example, in a UO factory, since steel sheets that have been rectangularized by a shear or gas cutting machine are handled offline, generally,
As shown in FIG. 12, a side guide is provided in front of the edge mirror 22.
Orient the steel plate 10 using 20 and cut the edge mirror 22
Cutting is performed with the 24 position fixed and the cutter opening fixed. Therefore, at the UO factory, ± 4-5m
It is possible to obtain linearity of m / 10m length. However, in the thick steel plate production line, since the steel plate 10 that is not necessarily rectangular as rolled is cut, in the method using the side guide 20 as in the UO factory as shown in FIGS. 13 (A) and 13 (B). , Can not be aligned accurately. For this reason, the central position controller (Center Posit
ion control, CPC), edge position control (Edge Position
Control, EPC) etc. are used to cut along the rolling shape. That is, in the CPCS control, as shown in FIG. 14, control is performed so that the plate width after cutting (that is, the cutting width) becomes constant with reference to the center line 10C of the steel plate 10.
Further, in the EPC control, as shown in FIG. 15, control is performed so that the cutting margin (that is, cutting margin) is constant with reference to the edge shape of the steel plate 10. A method of setting the cut amount based on the steel plate plane shape data is disclosed in, for example, Japanese Patent Laid-Open No. 60-80511. However, in any case, when the shape of the material before cutting is changed, the linearity obtained is 10 to 50 ^ mm / 20m at most, as is clear from FIGS. 14 and 15.
It has a problem that the linearity is long and good linearity cannot be obtained. Further, when cutting with an edge mirror, the maximum cutting allowance is restricted for the following reason. (1) When the cutting allowance t becomes large, the chip length l becomes long,
A corresponding large chip pocket is needed. That is, as shown in FIG. 16, the chip length l corresponding to the contact length between the steel plate 10 and the cutter 24 becomes larger as the engagement angle θ between the steel plate 10 and the cutter 24 becomes larger, that is, the cutting margin t becomes larger. Increase. Corresponding to this, if you take a large chip pocket,
When the outer diameter D of the cutter 24 is constant, it is necessary to reduce the number of blades Z from the description, and when the feed amount Sz per blade is constant, the feed speed F decreases. Feed amount per blade
Sz is determined by the material and shape of the tip of the cutter 24, the material of the steel plate 10 and the like, and cannot be changed so much. For this reason, it is not appropriate to provide an excessively large chip pocket for an edge mirror or the like of a thick steel plate that requires high efficiency, and accordingly, the maximum cutting allowance is restricted. (2) The feed speed of the edge mirror 22 (the feed speed F of the steel plate 10) is inversely proportional to the cutting allowance t because the chip thickness hm needs to be constant depending on the tool conditions. Therefore, when high efficiency is required, it is necessary to minimize the cutting margin. Due to the above reasons (1) and (2), the edge mirror has a maximum cutting allowance, which is usually 10 to 20 mm.
/ About one ear. On the other hand, the planar shape of the rolled steel sheet is not necessarily rectangular as described above, and has a sheet width deviation from about 10 mm for the edging material to about 50 mm for the unaged material. Also, the variation of the average width is δ = 3 mm for the edging material.
Therefore, it occurs up to about δ = 15 mm in the material that has not been edged. Therefore, when the edge mirror cutting width is arbitrarily determined, the cutting amount often exceeds the maximum cutting allowance.

[Problems to be achieved by the invention]

The present invention has been made to solve the above conventional problems, and it is possible to determine an appropriate cutting width (in the case of CPU control) or cutting allowance (in the case of EPC control) of an edge mirror that does not exceed the cutting margin constraint. The object is to provide a possible edge mirror cutting method.

[Means for Solving the Problems]

The present invention measures plane shape data of a work material by using a plane recognition device provided upstream from the edge mirror when cutting with an edge mirror that cuts an end surface of the work material with a rotating cutter, and the plane shape data If the minimum width is larger than the product width upper limit tolerance, the smaller one of the cutting width obtained based on the minimum width and the cutting width obtained based on the product width upper limit tolerance is the edge mirror. If the minimum width in the plane shape data is smaller than the product width upper limit tolerance, the minimum width is obtained as a reference. The cutting width or cutting allowance by the edge mirror is determined so that the cutting width becomes the cutting width of the edge mirror, and further, a portion having a width exceeding the cutting constraint of the edge mirror is So as to shear in Saidoshiya which is arranged between the planar shape recognition device and Etsujimira is obtained by achieving the above object.

[Action and effect]

The present invention, when cutting with an edge mirror, measures the planar shape data of a workpiece using a planar shape recognition device provided upstream of the edge mirror, and the minimum width in the planar shape data is smaller than the product width upper limit tolerance. When the cutting width is larger, the cutting width obtained based on the minimum width or the cutting width obtained based on the product width upper limit tolerance, whichever is smaller, is the cutting width of the edge mirror. Width or cutting allowance is determined, on the other hand, when the minimum width in the plane shape data is smaller than the product width upper limit tolerance, the cutting width obtained based on the minimum value is the cutting width of the edge mirror, The cutting width or cutting allowance by the edge mirror is determined. Therefore, it becomes possible to determine an appropriate cutting width or cutting allowance of the edge mirror which does not exceed the cutting allowance constraint, and the edging milling can be performed with high efficiency. Further, since the portion of the edge mirror having a width exceeding the cutting margin constraint is sheared by the side shear arranged between the plane shape recognition device and the edge mirror, it is possible to reduce the variation in the width of the work material. However, it is possible to perform highly accurate width cutting with the edge mirror. Now, the case of CPC control will be described as an example. It is assumed that the plane shape data of the steel sheet 10 is obtained as shown in FIG. 2 by the plane shape measuring device including a measuring sensor for measuring the plane shape of a workpiece, for example, a steel sheet, and a calculator. In FIG. 2, y is the steel plate width, l _{1 to} ln are the steel plate longitudinal position (width measurement points), y _{M1 to} y _M n, y _{F1 to} y _F n are width data measurement values at each measurement point. When the minimum width Wmin in the obtained data is larger than the product width upper limit tolerance TOL as shown in FIG. 3, the cutting obtained by the following formula (1) with the minimum width Wmin as a reference. Width W ml ₁ and product width upper limit tolerance TOL according to the following equation (2)
Of the cutting widths W ml ₂ obtained on the basis of, the smaller one (W ml _{2 in} the example of FIG. 3) can be set as the cutting width W ml of the edge mirror. W ml ₁ = W min-t min (1) W ml ₂ = TOL-S (2) where t min of the formula (1) is the minimum cutting allowance (2-5 mm),
S in the equation (2) is the edge mirror cutting accuracy (0.5 to 1 mm). On the other hand, as shown in FIG. 4, the minimum width in the planar shape data
When Wmin is smaller than the product width upper limit tolerance TOL, the cutting width corresponding to the above expression (1) can be directly used as the cutting width W ml of the edge mirror as shown in the following expression. W ml = W min-t min (3) Thus, only by guaranteeing the minimum cutting allowance t min, the cutting allowance (hatched portion in FIGS. 3 and 4) is minimized over the entire length. By determining the cutting width W ml, edge mirror processing can be performed most efficiently.
Although the present invention has been described with reference to FIGS. 3 and 4 by taking the case of CPC control as an example, it is possible to obtain the cutting allowances from the left and right by the same processing even in the case of EPC control. is there. Further, when the edge mirror cutting width W ml is determined by the method shown in FIGS. 3 and 4 due to a large change in the shape of the steel plate, when the cutting allowance is partially excessive, the cutting amount is increased as shown in FIGS. As shown in the figure, the portion where the cutting allowance is excessive is pre-sheared by the side shear to the side shear width Wss, and then cut by the edge mirror to the cutting width W ml. 5 and 6
In the figure, the black portion is the cut-off portion by the side shear, and the hatched portion is the cut portion by the edge mirror. In such a case, for example, if the shear width Wss due to the side shear is set to the product width upper limit tolerance TOL and the widest part of the work piece is sheared with the side shear, the shape after that is the same as that shown in Fig. 4. Therefore, by setting the cutting width W ml of the edge mirror by the equation (3) and cutting, it is possible to manufacture a steel plate satisfying the product width upper limit tolerance TOL. Therefore, in the past, thick steel plates were roughly cut by the manufacturer and then accurately finished by the user before use.
According to the present invention, since the finish cutting can be performed accurately in the process of the manufacturer, the finish cutting by the user can be omitted.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 7, an apparatus for carrying out this embodiment includes a plane shape recognition device 30 for measuring plane shape data of a steel plate 10, and a side shear 32 provided on the downstream side of the plane shape recognition device 30. An edge mirror 34 provided further downstream of the side shear 32, and a controller 36 for controlling the side shear 32 and the edge mirror 34 according to the planar shape data detected by the planar shape recognition device 30. Has been done. The operation of this embodiment will be described below with reference to FIG. According to the plane shape data measured by the plane shape recognizing device 30, the control device 36 first sets the step 100.
Then, according to the above formulas (1) and (3), the edge mirror cutting width W
Calculate ml (W ml ₁ ). Next, in step 102, it is determined whether or not the calculated edge mirror cutting width W ml is less than or equal to the edge mirror cutting width W ml (W ml ₂ ) calculated by the equation (2). When the determination result is negative (in the case of FIG. 3), the process proceeds to step 104, and the value calculated by the above equation (2) is set as the edge mirror cutting width W ml. If the determination result of step 102 is positive, or after step 104 is completed, the process proceeds to step 106 where the calculated edge mirror cutting width W ml is the product width lower limit tolerance TOL + cutting accuracy S.
It is determined whether or not this is the case. If the determination result is negative, the process proceeds to step 108 and it is determined that the width is insufficient. If the determination result of step 106 is positive, the process proceeds to step 110, and the measured maximum value Wmax is larger than, for example, the edge mirror cutting width W ml + maximum cutting allowance t max, and therefore the cutting allowance is excessive. Or not. If the determination result is negative, the process proceeds to step 112, and the edge mirror cutting width W ml at that time is set as the cutting width of the edge mirror 34 as it is. On the other hand, when the result of the determination at the above step 110 is positive and the cutting allowance by the edge mirror 34 is excessive, the process proceeds to step 114, where the side shear 32 causes the plate width to be W ml + t.
After cutting the over-width portion exceeding max, the edge mirror 34 is cut by the cutting width W ml. In this embodiment, the side shear 32 is configured to shear only the overwidth portion, but the side shear 32 may be configured to shear not only the overwidth portion but the entire length. In this case, after being cut with good linearity by the side shears 32, the edge mirror 34 can finish with good width accuracy, and a thick steel plate with good width accuracy and good linearity can be manufactured. For example, taking a steel plate having a plate thickness of 15 mm, a plate width of 2500 mm and a plate length of 20000 mm as an example, as shown in Table 2 below, the side shear 32
By using together with the shear by the edge mirror 34,
Both linearity and width accuracy can be improved. Conventionally, thick steel plates have been roughly cut by the manufacturer and then accurately finished and cut by the user, but in this way, the finish cutting can be done accurately in the process of the manufacturer, so Finish cutting can be omitted. In addition, although the above-mentioned examples apply the present invention to the cutting of thick steel plates, the scope of application of the present invention is not limited to this, and it is apparent that the same can be applied to the end face cutting of general work materials. Is.

[Brief description of drawings]

FIG. 1 is a flow chart showing a procedure of an embodiment of an edge mirror cutting method according to the present invention, and FIG. 2 is a diagram showing an example of plane shape data of a rolled steel sheet for explaining the action of the invention.
FIG. 3 and FIG. 4 are also diagrams for explaining a method of determining the edge mirror set value, and FIG. 5 is similarly a cutting margin by the side shear when there is a portion exceeding the cutting margin constraint of the edge mirror. FIG. 6 is a plan view showing the set values, FIG. 7 is a process drawing showing an example of the configuration of an apparatus for carrying out the present invention, and FIG. For the purpose of explanation, a sectional view showing the state of the side shears during shearing of the steel plate, FIG. 9 is a diagram showing an example of the relationship between the shearing force of the shears and the knife gear, and FIG. 10 is
Sectional view showing the state when the steel plate is sheared when the knife gear cup is too small, FIG. 11 is a perspective view showing the sheared section by the side shear, FIG. 12 is a process diagram showing an edge mirror treatment example at the UO factory, FIG. 13 (A) and (B) are process diagrams showing the edge mirror treatment state in the steel sheet production line, FIG. 14 is a plan view for explaining the concept of CPC control, and FIG. 15 is a concept of EPC control. FIG. 16 is a plan view for explaining the above, and FIG. 16 is a diagram for explaining the cutting ability of the edge mirror. 10 …… Steel plate, 22 …… edge mirror, 24 …… cutter, 30 …… planar shape recognition device, 32 …… side shear, 34 …… edge mirror, 36 …… control device.

Claims (1)

(57) [Claims] 1. At the time of cutting by an edge mirror which cuts an end surface of a work piece by a rotating cutter, plane shape data of the work piece is measured using a plane shape recognizing device provided upstream of the edge mirror, and the plane shape is measured. If the minimum width in the data is larger than the product width upper limit tolerance, the cutting width obtained based on the minimum width and the cutting width obtained based on the product width upper limit tolerance,
The cutting width or cutting allowance by the edge mirror is determined so that whichever is smaller becomes the cutting width of the edge mirror. On the other hand, when the minimum width in the plane shape data is smaller than the product width upper limit tolerance, the minimum The cutting width obtained based on the value is the cutting width of the edge mirror, the cutting width or the cutting allowance by the edge mirror is determined, and further, a portion having a width exceeding the cutting constraint of the edge mirror is defined as the plane shape recognition device. A method for cutting an edge mirror, which comprises shearing with a side shear arranged between the edge mirrors.