JPS5997705A - Continuous rolling method - Google Patents

Abstract

PURPOSE:To prevent the decrease in the yield of a rolled product by making preparatory plan in such a way that the flaw generating part on the surface of the rolled product is confined to the boundary part of the products in the stage of passing a continuous casting billet in succession through a rolling mill without cutting and rolling the product to various specifications. CONSTITUTION:The flaw on the surface of a continuous casting billet 4 obtd. with a continuous casting device is detected with a flaw detector 5, and the billet is heated in a heating furnace 6. The heated billet is passed through a roughing mill 7 and the condition of the flaw is rechecked with a flaw detector 8 and thereafter the billet is rolled to strips S1-Sn conforming to customer's order specifications. The strips are passed through a processing installation 10 for cleaning, pickling, washing, etc. and are cut with a shear 11. The cut strips are coiled 12. The schedule for product planning by finish rolling is so made out that the place of the flaw A detected in this case comes to the boundary part of the products of various specifications, for example, between Sn' and S'n-1. Since the flaw A is located in the boundary part between the products of different specifications, the yield of the product and production efficiency are improved without producing large reject parts in the finished product.

Description

[Detailed description of the invention] [Field of application of the present invention] The present invention comprises 1. This invention relates to a rolling method in which the material cast by a buried rolling mill, particularly a continuous casting device, is continuously rolled by being fed to the next step, a hot rolling mill, for a small fee, without cutting the material into 9J pieces.

[Prior art].

As is well known in the conventional rolling method, a material cast in a continuous casting device is cut into a predetermined length by a cutter at the outlet end of the device, and then transported to the next process. This cut material is called sump, but in recent years this sp2p τ cut wT
Immediately thereafter, direct rolling, which involves rolling, and the hot charging method, which involves rolling the steel at high temperature in a heating furnace, were developed, and energy-saving rolling became popular. One of the problems with this energy-saving rolling is the quality of the material cast in the continuous casting equipment. Due to operational or component reasons, flaws may occur on the cast material and reduce the quality of the material, or the flaws may need to be taken care of, and Rolling and rolling are excluded from hot charging, which can lead to a drop in production efficiency.For this reason, online flaw detection equipment and flaw care equipment have recently been developed, which can be applied to direct rolling and hot charging. No effort is being made to increase the rate.

Even in continuous rolling, in which a continuous casting machine and a hot press are connected together to hot-roll the rolled material without cutting it, this problem of wear cannot be avoided. It is expected that production efficiency and production yield will decrease if the rolling schedule is followed, and all of the rolled material becomes defective.

[Purpose of the invention]

The present invention relates to a rolling method that reduces main seat efficiency and yield in a continuous rolling apparatus that houses a continuous casting apparatus.

[Summary of the invention]

Figure 1 shows an overview of the continuous rolling equipment. The molten steel poured here is further poured into a mold 2, where it is cooled to a predetermined thickness and width.

The molten steel cooled and solidified in the mold 2 is drawn out by rolls 3, formed into a material 4, and then extruded to the next process. Reference numeral 5 indicates a material flaw detection device R. The passed material is passed through a swallow furnace 6 and heated to a predetermined temperature by heat or bed heating. The material leaving the heating furnace 6 is rolled in a rough rolling mill 7, and further rolled in a finishing mill 9 to a certain finishing thickness.

Between the rough rolling mill 7 and the finishing rolling mill 9, there is a flaw detection cross section similar to the flaw detection device 5.

Re-check the condition of the treated material for defects.

IO indicates a processing equipment for the strip 13 after hot rolling, and Jll indicates a shear that performs cooling, pickling, washing, etc. of the strip 13 after hot rolling. The wound strip is made into one finished coil.

[Embodiments of the invention]

FIG. 2 shows a detailed illustration of the invention, namely:
(a) shows the material that has been rolled from the continuous casting device to the hot rolling mill to become a finished product, and is a strip S I + 82 HS31 that is a finished product according to the customer's order specifications.
...5n-11sa. Each strip 81 is usually cut with a shear and wound with a coiler, but in (a) each strip is arranged in a straight line. S) Point A of IJ knob Sn indicates a flaw detected by a flaw detector, and depending on the position of point A and the KM of the flaw, the entire strip S7 may be scrapped or the strip grade may deteriorate. It ends up.

The present invention attempts to bring this flaw just between S, and S,-1 as shown in FIG. 2(b). fv That is, change the rolling direction from S□ to 8-tt, and change the entire finished product planning schedule so that point A is exactly between 8, / and S≦-1. Width W of middle and valley strips St
If st- is constant, the difference between each strip SS is thickness-+
ht and length tI. WI (ht X, 4t)
The volume represented by is originally equal to the volume WI (HXL+) expressed by the thickness Hl and length Lt of the material manufactured by the continuous casting apparatus as shown in FIG. In other words, h I"tI=H"LI...
・ (i) Therefore, the product specifications are determined from the continuous casting equipment (a collection of data converted to the length of the material in the machine) as shown in Figure 3 (
Material length L corresponding to b): m I17 t...,
Corresponding to Lt-1, the only choice is to select a specification in which point A corresponds to the cut.

FIG. 4 shows a method of tracking material 4, which forms part of the invention. In Fig. 4, reference numeral 15 denotes a table roller for material conveyance, and a pulse generator 16 is installed at the shaft end of the table roller. When the rice is placed under the flaw detection device 5, the flaw detection device 5 sends the material sensing signal No. 16 to the measuring device (FI14). The pulse generator 16 immediately starts counting the pulses generated and updates the material's sub-length data. Using this data, the point on the material directly below the flaw detector 5 can be You can also see the distance from the tip of the finished product, and you can also see if the material of the 101st product is being used.

FIG. 5 shows the device d of the present invention. 14 indicates a computer, and according to the product specifications, the finished product plan S1#Stt...18f
i$811+□ has already been planned, and the flaw detector 5 detects a flaw at a position corresponding to 8 degrees of the finished product when S□ is being rolled and wound. At this time, this No. 16 is immediately sent to the computer 14. The calculator 14 receives this number 1d and the A point is S.

It calculates whether the position is close to 04g, and if the A point is within the tolerance from the boundary by 4, it immediately reschedules. At this time, the rescheduling target is the material 84 onwards shown in FIG. 5, that is, the rough rolling mill 7. Finishing mill 9 is J:E, and the material being rolled is subject to rescheduling. Which product number is present between Lo in Figure 5 can be easily determined by using the count data explained in Figure 4.
Assuming that APa is given, it is sufficient to find i that satisfies the following. In the case of FIG. 5, i=n. Next, by finding i that satisfies the following, N
O is decided. In the case of FIG. 5, i=3.

Therefore, the targets for rescheduling are s, e S5
e..., Syu,...S.

In FIG. 5, t indicates the distance from the tip of the product S to the point A where the flaw is present. All you have to do is look at the outcome of the finished product that will result in a rescheduling decision from among 84e..., sl,...Sm. This calculation is performed in the computer 14. After the rescheduling is completed, the first shift for setting the valley rolling mill will be the first shift for setting up the valley rolling mill.
6, and at a predetermined timing, settings suitable for finishing the finished product are made for valley rolling cultivation.

Then, it is cut to a predetermined length with a shear, resulting in a finished product.

Note that 8 in the figure indicates a low detection device.

[Brief explanation of drawings]

The first problem is the continuous casting equipment and the outline of the continuous rolling mill that combines the hot rolling mill. Figures 2 (a)' and (b) show when the material leaving the continuous casting equipment becomes a finished product. A perspective view showing the shape of
Figures 3 (a) and (b) are perspective views showing the finished product plan of the material coming out of the continuous casting machine, Figure 4 is a diagram showing the principle of measuring the length of the material coming out of the continuous casting machine, and Figure 5 The figure is a system diagram of an example device of the Isso J7 mountain according to the present invention. 5...Low detection device, 7...: m rolling mill, 9... Finishing rolling mill, 11... Shear, 12... Coiler, 1
4...Calculator, 8th m C→ (b) Figure 10, 4

Claims (1)

[Claims] 1. In the continuous rolling method, in which hot rolling is performed without cutting 1il+ of the cast material produced in the continuous casting equipment, by detecting flaws in the cast material, the part where the flaws occur is transferred to the rolling machine. A continuous rolling method, characterized in that the product is corrugated so as to form a boundary part of the product to be rolled;