JPH052092B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for sampling steel materials, and more particularly to a method for rapidly collecting a sample for analysis from any position on the surface of a continuously cast hot slab. .

[Conventional technology]

In continuous casting, knowing the quality (composition) of unsteady parts of the slab (joints between different steel types, etc.) when the slab is at high temperature is useful when performing hort charging and direct pressure feeding for the purpose of energy saving and high productivity. It is essential.

Conventionally, there has been no technique for taking samples for analysis online from a desired location of a high-temperature slab, and sampling as shown in FIGS. 11 and 12 has been performed offline. FIG. 11a is a perspective view of the slab 1 with a drill sampling hole 62 drilled therein, and FIG. 11b is a longitudinal cross-sectional view of the drill sampling hole 62 portion. After removing the black crust on the slab surface 61, holes were drilled at desired positions in the steel material from the direction of the arrow 64 using a hand drill, and the chips generated at that time were collected and subjected to wet analysis.

In addition, if the sampling position is not limited, the corner part of the slab is manually gas-cut off-line as shown in Figure 12a, a sample 65 as shown in Figure 12b is taken, and a cantback analysis is performed. was. Quantback analysis is a method of spectroscopic analysis using a Quantometer (photoelectric direct reading spectrometer), which eliminates the inconvenience of conventional spectrometers and allows the amount of analyzed components to be read with a meter. There are various types of these, including those for production management and research.

Offline sampling as described above is
This involves a decrease in the temperature of the slab and requires a long time to analyze the components from chips as shown in FIG. Therefore,
It is not possible to carry out so-called hot charge, in which red-hot cut slabs transported from a continuous casting machine are directly transported to a heating furnace to save heating energy and give additional heat, and then hot-rolled. It has not been possible to immediately hot-roll a cut slab as it is or by heating only both end faces, where the temperature tends to drop, in so-called direct rolling.

The method shown in Fig. 12 has the same problems as the method shown in Fig. 11 above, and also has the disadvantage that the sampling location is limited and sampling cannot be performed from the center or surface of the slab in the thickness direction. .

[Problem that the invention seeks to solve]

The purpose of the present invention is to develop a technology that allows sampling for bulk analysis of lumps with a diameter of 10 mm to 25 mm and a height of 10 to 25 mm from any position on a slab heated to a temperature of 900°C to 1200°C.

To establish a rapid sampling method that can complete sampling from one location within, for example, 150 seconds.

Includes a method for handling chips generated at high temperatures to solve the problem that chips continue to flow during cutting and get entangled with the rotating shaft, which not only causes malfunctions but also is dangerous.

The shape shall be such that the concave part of the sampling material left on the slab during sampling does not affect the quality of the product after rolling.

The purpose of the present invention is to provide an online rapid sampling method for high-temperature slabs that simultaneously solves the following problems.

[Means for solving problems]

In order to solve the above problems, the present invention adopts the following technical means.

(b) A block sample is collected from the surface of the steel material by high-speed cutting.

(b) A process of forming a dish-shaped concave groove ring-shaped recess by cutting on the surface of the steel material, leaving a cylindrical uncut part in the center, and a cylindrical uncut part left in the center. The process of cutting and separating the base of the base is performed continuously.

(c) Chips generated when cutting steel materials, especially high-temperature cast slabs, are
It is ductile and continuous like a tape, reducing workability. Therefore, in order to efficiently remove the chips, a so-called step feed is performed in which the cutting blade is sent while reciprocating in the axial feeding direction to separate the chips into short pieces.

(d) The recesses remaining on the surface of the steel material after sampling shall be in the shape of a gentle bottom dish with a diameter of at least 6 times the depth.

[Effect]

The technical means of the method of the present invention described above has the following effects. In other words, high-speed cutting makes it possible to collect samples online for cantback analysis from any location on the hot steel surface, and enables continuous casting slabs to be hot-charged or directly rolled.
It significantly improves quality control accuracy and contributes to energy savings and high productivity.

〔Example〕

FIGS. 3 to 5 show general views of an apparatus suitably used for carrying out the method of the present invention, and FIGS. 6 to 10 show partial detailed views thereof. Examples of the present invention carried out using this apparatus will be described in detail below.

This device includes a cutting blade 21 that cuts slabs, a motor 22 for driving the main shaft of the cutting blade 21, a blade feeding motor 25 that provides feed such as a step feed to the cutting blade 21, and a blade feeding shaft 24 of its drive system.
It is composed of a feeding mechanism 29.

Main shaft portion 28 of cutting blade (carbide metal tip) 21
The main body 28a having a
is installed. Pulley 40 of the main shaft drive motor 22 and pulley 4 attached to the main shaft section 28
A belt 42 (which may be a chain) is set across the belt 1 and the cutting blade 21, and the cutting blade 21 is driven to rotate by the drive of the motor 22. 37 is a hydraulic cylinder provided at the upper end of the main shaft portion 28.

On the other hand, a male-threaded blade feeding shaft 24 is rotatably supported by bearings 45 fixed to the upper and lower sides of the support frame 43a, and a pulley 46 is fixed to the upper part of the shaft 24. Further, a cutting blade feed motor 25 that rotates in forward and reverse directions is attached to the support frame 43a, and a timing belt 47 (which may be a chain) is stretched between the pulley 44 of the motor 25 and the pulley 46 of the tool feed shaft 24. By rotating the blade feed motor 25 in the normal or reverse direction, the blade feed shaft 24 is rotated in the normal or reverse direction via the pulley 44, belt 47, and pulley 46.

A male threaded feeding mechanism 29 is screwed into the male threaded blade feeding shaft 24.

Since the feeding mechanism 29 has an integral structure with the lifting frame 39, the blade feeding shaft 2 is moved by the motor 25.
4 rotates forward or backward, the main shaft drive motor 22 and the elevating frame supporting the cutting blade 21 can be raised or lowered, and the cutting blade 21 can therefore be moved up and down.

Reference numeral 23 denotes guide rails installed vertically on both sides of the support frame 43a, and along the guide rails 23, slide bearings 48 fixed to the elevating frame 39 are guided, so that the elevating frame 39 It is designed to be able to go up and down smoothly.

Details of the cutting blade 21 are shown in FIGS. 6 to 10. 6 to 10, 30 is the main shaft portion 2
8 is a shank that is attached to a tapered hole (not shown) in the main body 28a, and at the bottom of the main body 30a following the shank 30, a pair of blade mounts 50 are arranged in a line with the center of the tsuba 49 in between. . A blade (carbide metal tip) 31 is attached to the tip of the blade mount 50 with a bolt 51 for cutting a recess around the sample.

In the illustrated example, three blades 31 are mounted on one blade mount 50, and three blades 31 are mounted on the other blade mount 50.
Two of them are attached, and they are arranged diametrically offset from each other so that the recessed part of the steel material due to cutting is not interrupted.

Further, a pair of bearings 52 are provided at the lower part of the collar 49 at positions substantially orthogonal to the pair of blade mounts 50 (FIGS. 8 and 10). An arm 33 is rotatably supported.

A blade (carbide metal tip) 34 for cutting the sample is attached to the tip of each arm 33 by a bolt 53. One end of a pair of links 35 is connected to the side end of each arm 33 via a pin 54, and the other end of the link 35 is connected to the tip of a rod 36 by a pin 55.

A hydraulic cylinder 37 is supported on the upper part of the main shaft portion 28 by a support frame 56, and this hydraulic cylinder 37 is connected to the rod 36.

The cutter 31 is for cutting the dish-shaped ring-shaped groove 3 shown in FIG. 1a. While rotating around the cutting axis, the blade 31 is fed at high speed to near the surface of the steel material, as shown in FIG. It is machined.

Root cutting knife 3 of sample 2 left in a cylindrical shape
4, the arm 33 is opened and closed to the position 33a around the pin 32, and includes a root cutting blade 34 fixed to the arm 33, a link 35 for rotating the arm 33, and a link 35 that moves up and down. It is composed of a rod 36 and a hydraulic cylinder 37 that moves the rod 36 up and down.
The piston rod 7 is equipped with a composite needle bearing 38 that receives thrust.

The method of the present invention was carried out using the above apparatus.

First, as shown in FIG. 1a, grooves 3 around the sample of slab are cut. At this time, the hydraulic cylinder 37
pulls up the rod 36 and the arm 33 is retracted to the position shown by 33a (see Figure 6).In this state, the main shaft 28 is rotated by the motor 22 and the sample 2 shown in Figure 1 is fed.
The surrounding groove 3 is cut to a predetermined depth.

Next, stop the feeding, operate the hydraulic cylinder 37 while rotating the main shaft 28, gradually push up the rod 36, lower the arm 33a to the position 33 (Fig. 6), and move the sample root cutting blade 34 to the sample 2. The sample is cut by cutting into the root (root cutting part 4).

When the cutting of the sample root cutting portion 4 is completed, the rotation of the main shaft 28 is stopped, and the main shaft 28 is raised by driving the feeding mechanism 29, tool feeding shaft 24, and tool feeding motor 25 while the cutter 34 holds the sample. After that, the sample collecting device is moved to a predetermined position, the rod 36 is pulled up by the hydraulic cylinder 37, the arm 33 is opened to release the sample holding, and the sample 2 is collected.

〔Effect of the invention〕

According to the present invention, the following effects are achieved.

(a) Sampling can be done hot from slabs, which has a large energy saving effect.

(b) Online sampling is possible, and since the sample is cylindrical in shape, cantback analysis can be performed as is, and results can be obtained more quickly than before. The time it takes to get the results is about 1/100 of the conventional time. Also, sampling work
It can be done within 150 seconds. This eliminates the accumulation of slabs.

(c) The conventional sampling work using a hot plate (approximately 100℃) using a drill is no longer necessary, improving safety.

(d) Automatic sampling becomes possible, resulting in labor savings.

(e) Since the slab sampling trace is a dish-shaped concave groove, the influence on quality after rolling is reduced and the yield is improved.

(f) The present invention is suitable for taking samples for analysis of continuously cast slabs to be subjected to hot charging, etc., but is also applicable to sampling from other steel materials. Note that a step feed is not necessarily required if the steel material has low cutting ductility.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the steps of an embodiment of the method of the present invention, FIG. 2 is a graph showing step feeds in the first step of the present invention, and FIGS. 3 to 5 are diagrams showing preferred implementation of the method of the present invention. Fig. 3 is a side view, Fig. 4 is a front view,
Fig. 5 is a plan view, Fig. 6 is a side view of the cutting blade, Fig. 7 is a front view thereof, Figs. B arrow view, C-
The C arrow view, FIG. 11, and FIG. 12 are explanatory diagrams of the conventional sampling method. DESCRIPTION OF SYMBOLS 1... Steel material, 2... Sample for analysis, 3... Dish-shaped concave groove, 4... Root cutting part, 21... Cutting blade, 22... Spindle drive motor, 23... Rail (sliding surface), 2
4... Shaft for blade feed, 25... Motor for blade feed, 27... Table roller, 28... Main shaft portion, 29
...Feeding mechanism, 30...Taper shank, 31...Cutter for machining recesses, 32...Pin, 33...Arm, 34
...root cutting knife, 35...link, 36...rod,
37...Hydraulic cylinder, 39...Elevating frame, 50...Cutter mounting stand.

Claims (1)

[Claims] 1. By leaving the cylindrical center part and cutting its periphery into a dish-shaped concave ring shape, and then cutting the base of the remaining cylinder, the cylindrical part is removed from the surface of the steel material. A steel sampling method characterized by collecting samples for analysis. 2. The steel material sampling method according to claim 1, wherein in the step of cutting the dish-shaped concave groove, cutting is performed while reciprocating the cutting blade in the axial feeding direction.