JPS5938870B2 - How to collect samples from continuously cast slabs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for taking samples of continuously cast slabs.

Continuously cast slabs are produced by gradually solidifying high-temperature molten metal from the surroundings through a mold and a secondary cooling zone, and after solidification is completed, the slab is cut into appropriate lengths by a cutting device.

The internal quality of the slab (distribution of inclusions, internal cracks, etc.). Therefore, continuous slabs are generally produced by polishing the cut surfaces of the weeded slabs to obtain 1, S, E (I
nstantaneousSlabEvaluation
In many cases, an internal investigation of the slab, referred to as n), is carried out and used as an indicator for grading the quality of the slab and determining the continuous casting operation status. Conventionally, this method for determining the white matter of a cast slab involves cooling the slab after casting is complete, or polishing the cut surface of the slab after cooling.
, S, E methods, etc. have been implemented, but long and heavy slabs require a long time to cool down, and slabs in the production and distribution process are easy to flow and equipment layout. Rapid internal examination was difficult.

Furthermore, in recent years, with the adoption of energy-saving direct rolling or hot charging technology that requires high-temperature slabs to be quickly sent to subsequent processes, the conventional slab internal quality inspection process has become inapplicable.

The present invention was developed in view of the above situation, and its characteristics are that it straddles the slab conveyance system and is driven synchronously with the casting speed, and that gas cutting torches are installed on both sides of the slab on the outside. In order to take appropriate samples of the slab during continuous casting on the slab conveyance system using gas cutting devices that are arranged in parallel and facing each other along the casting line, one of the torches upstream of the slab conveyance system The progress of cutting the slab by the side torch is delayed compared to the progress of cutting the slab by the downstream torch, and the separation from the slab base is completed at a position above the sample receiving section provided at an appropriate part of the conveyance system, and the specimen receiving section is removed from the sample receiving section. The purpose of this invention is to control the progress of cutting the slab by the gas cutting torch so that the cut pieces fall under their own weight into the storage part, and to collect and collect slab samples in an extremely functional manner without interfering with the smooth flow of the slab. It is an object of the present invention to provide a method for sampling continuously cast slabs, which allows for easy off-line internal quality inspection.

The inventors of the present invention have conducted various studies to complete the present invention, and as a result, the first point is to cut the sample at the same time as cutting the slab as a measure to collect samples online without disturbing the flow of the slab. In order to collect the cut sample at the scheduled collection position without installing a special device, the objective can be achieved by controlling the progress of cutting the slab so that the separation point between the sample and the following slab can be made at the scheduled collection position. I was able to find out that.

Specific measures for this purpose include the adoption of a gas cutting device with gas cutting torches mounted in parallel towers, controlling the change in the position of the cutting site between the sample and the succeeding slab, and effectively arranging the sample recovery system. As a result of functional combination, we were able to complete an excellent sample collection method. Hereinafter, the present invention will be described based on an example of an apparatus for carrying out the present invention. FIG. 1 is a schematic plan view of the area around the slab cutting machine in the continuous casting equipment, and FIG. 2 is a schematic side view of the area around the slab cutting machine in the continuous casting equipment.

Reference numeral 1 denotes a slab conveyance system, which is usually configured as an unloading roller table.

2 is a final drawing roll, 3 is a continuously cast slab, 4 is a truck for a gas cutting device, 5 is a clamp device attached to the truck, and a driving source such as a hydraulic power source is placed on the truck, It is provided so as to be able to press the slab to be cut.

6 indicates a traveling rail, and 7 indicates wheels.

Reference numerals 8 and 9 indicate gas cutting torches, which are provided facing each other so as to be located on both sides of the slab, and are both attached so as to be movable in the width direction of the slab.

Reference numerals 10 and 11 designate gas cutting torches, which, like the gas cutting torches 8 and 9, are located on the outside of both sides of the slab, respectively, and are connected to the torches 8 and 9 on the downstream side of the slab delivery system along the casting line. They are arranged in parallel on the upstream side of the slab delivery system so that the interval can be adjusted as appropriate, and both are attached so as to be able to move forward and backward in the width direction of the slab.

12 is a measuring roll used for measuring the length of the slab.

Reference numeral 13 denotes a sample receiving section, which is configured as, for example, a sample carrying cart, which is movable in a direction intersecting the casting line in a region below the slab carrying system.

A case will be described in which samples are appropriately collected during cutting of a continuous cast slab (hereinafter referred to as slab) to a predetermined length in the above-described apparatus configuration.

First, measure the length of the piece to be cut using the measuring roll 12.
The length is measured at , and the clamping device 5 of the gas cutting equipment trolley 4 (hereinafter simply referred to as the trolley 4), which is waiting at an appropriately set position, is energized to clamp the slab 3 and synchronized with the slab drawing speed. Then, the cart 4 is driven in the downstream direction of the slab delivery system.

At the same time, the gas cutting torches 8, 9 and 10, 11 advance from the casting side in the width direction toward the center of the slab and begin gas cutting. A slight difference is provided between the progress of cutting the slab by the downstream torches 8 and 9 and the progress of cutting the slab by the upstream torches 10 and 11. In other words, the timing of separating the cast slab is not at the same time at both the cut portions of the specimen, but when the upstream cut portion by the upstream torches 10 and 11 is cut at the same time.
It is set so that the cutting is completed slightly later than the downstream cutting section by the downstream torches 8 and 9. As a result, the cut slab can be moved to the downstream area, the sample section can be positioned directly above the sample receiving section, and the sample (cut piece) can fall directly under its own weight onto the sample delivery cart 13. . The slab cutting progress difference can be appropriately set by setting the torch position on the trolley 4, adjusting the forward speed of the torch, and the like.

In particular, in order to completely separate the sample from the slab base directly above the sample receiving section, it is necessary to It is preferable to control the forward speed of the upstream torches 10 and 11 in consideration of the cut length and the like (calculation processing by the control device, etc.).

In this way, the sample can be reliably dropped onto the carry-out cart 13 under its own weight.

After separating the sample, the clamp is released, the carriage is returned to the standby position, and the length of the slab to be cut next time is measured using the measuring roll 12, and cutting of the slab to a predetermined length is continued. When a sample is needed again, the above procedure is repeated.

By constructing and using the present invention as described above,
During continuous casting, specimens of slabs can be collected very quickly and easily by separating the flow process of the slabs.

2I. S. Internal quality inspections such as E can be carried out independently of the slab distribution process.

3. Since rapid internal quality inspection has become possible, continuous casting operation conditions can be grasped and countermeasures can be taken quickly.

4. Capable of collecting small samples and has good cooling ability. S. Internal quality tests such as E can be performed quickly.

It has the following advantages and has an extremely large effect in contributing to operational stability and quality assurance.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of the area surrounding the slab cutting machine in the continuous casting equipment; FIG. 2 is a schematic side view of the area surrounding the slab cutting machine in the continuous casting equipment. 1 is a drawing roller table (slab delivery system), 2 is a final drawing roll, 3 is a slab, 4 is a trolley for gas cutting equipment, 5 is a clamp device, 6 is a traveling rail, 7 is a wheel, 8 and 9 are A gas cutting torch (on the downstream side of the slab delivery system), 10 and 11 are gas cutting torches (on the upstream side of the slab delivery system), 12 is a measuring roll, and 13 is a sample delivery truck.

Claims (1)

[Claims] 1 Slabs are transported using a gas cutting device that straddles the slab conveyance system and is driven in synchronization with the casting speed, with gas cutting torches facing each other on both sides of the slab and arranged in parallel along the casting line. When appropriately sampling a slab from a slab during continuous casting on the system, the slab cutting progress of the torch on the upstream side of the slab conveying system is slower than the slab cutting progress of the downstream torch, and The cutting progress of the gas cutting torch is controlled so that separation of the cast slab from the base body is completed at a position above the sample receiving section provided at an appropriate part of the conveyance system, and the cut piece falls under its own weight to the sample receiving section. A method for sampling continuously cast slabs, characterized by: