JPH049460B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Field of Application> The present invention provides a method for rolling metal sheets at high temperatures such as immediately before or during hot rolling on a production line while the metal sheets are stopped. , relates to an apparatus for collecting samples for material analysis.

<Conventional technology> Conventionally, when collecting samples for material analysis of hot-rolled metal, it has been necessary to collect the samples while they are still melting, or to cut or melt them after the temperature has cooled sufficiently after hot rolling. It was tottering.

<Problems to be Solved by the Invention> In the conventional cold sampling of samples, it is necessary to subject the sample to a soaking process, so it takes 2 to 3 days for the analysis results to be obtained. Therefore, if the analysis results show that the product is defective,
Regarding large quantities of products from the same lot that have already been produced,
There was a problem where corrections such as ingredient adjustment could not be made. In particular, in the case of steel plates, slabs that are generally formed by continuous casting are often immediately hot-rolled continuously in a multi-stage rolling mill, and if a defect like the one described above is found, the loss due to the defect is extremely large. There was a problem.

In addition, when a sample is taken from molten metal, it is possible to analyze the components at the melting stage, but it is physically impossible to analyze the presence or absence of impurity precipitation after solidification, and it is difficult to obtain sufficient analysis results. There was a problem that I couldn't solve.

This problem is partially solved by taking the sample on the transfer line of the hot metal plate. but,
Since the device is used midway through the production line, it is desired that it be small. Therefore, rather than installing it fixedly in the middle of the production line, it should be placed on the hot metal plate using a crane, or placed on the side of the production line and on the hot metal plate. It is thought that it would be better to use a type that is supported on a rotating arm so that it can be moved as necessary. In this way, the size can be made smaller without hindering production compared to a fixed type. However, miniaturization causes the following problem in that the main body becomes lighter. That is, when the cutting resistance suddenly increases during sample collection, it is difficult to maintain an independent posture due to its own weight, resulting in a problem in which there is a risk of movement or overturning. In general, fixed-type cutting devices have a large body weight or are strongly fixed to a fixed base, so if the strength of the tool can withstand it, the temporary increase in resistance can be overcome with little problem. However, if the main body is heavy enough to withstand normal cutting resistance and is designed to stand on its own, for example, if an electric handheld drill is not held firmly enough at the beginning of cutting, the entire body will move and move to the desired position. To prevent drilling, the main body moves when cutting resistance increases abnormally.

An object of the present invention is to provide an apparatus that can cope with an abnormal increase in cutting resistance and can collect a sample even when the apparatus has a weight that can withstand normal cutting resistance.

<Means for Solving the Problems> The means according to the present invention is a self-supporting type in which a support leg that is extended and contracted by a telescoping device is provided downwardly protruding so as to come into contact with the upper surface of a hot metal plate on a hot metal plate transfer line. In the sample collecting device, the main body is provided with a cutting part having an automatic feed mechanism so as to scrape the sample from the hot metal plate with a rotary cutting tool, and the cutting part is provided with a detection part for abnormal cutting resistance, The present invention is characterized in that a control unit is provided that responds to the support leg and slightly extends the support leg to such an extent that the abnormal cutting resistance is temporarily reduced or eliminated.

<Function> According to the above means, when the cutting resistance temporarily increases due to a local hardness difference in the hot metal plate, the detection section detects the abnormal cutting resistance and slightly shifts the support leg. Due to the extension, the cutting tool will move back a little in a direction opposite to its feed direction, and a short time later the continued tool feed will begin cutting the hot metal sheet again. This redoing operation avoids movement of the main body due to a temporary increase in cutting resistance, and in most cases, cutting is restarted with a resistance comparable to the normal cutting resistance.

Note that the total weight of the main body structure should be larger than the reaction force during normal cutting, and the frictional resistance between the hot metal plate and the supporting legs should be larger than the maximum cutting torque during normal cutting. In this case, there is no problem with normal cutting, and it meets the objectives of miniaturization and weight reduction.

<Example> Fig. 1 shows a schematic configuration of an example, in which 1 is a self-supporting main body, 2 is a cutting part, 3 is a fixed column, 4 is a rotating arm, 5 is a support leg extension and contraction device, and 6 is a support leg. and
In FIG. 2, 7 is a detection section, and 9 is a control section.

The self-supporting main body 1 is in the form of a plate with high rigidity, and has a rotating arm 4 extending from one end thereof. The pivoting arm 4 has a cylindrical part 10 at the end opposite to the self-supporting body 1, and has a fixed column 3 in its inner hole.
The upper end of the is inserted. The fixed support 3 is a highly rigid one that stands vertically from a fixed part such as a floor surface, and the rotating arm 4 is connected to the main body 1 with a cylindrical part 10.
It is rotatably supported. The cylindrical portion 10 is configured to be able to move slightly upward with respect to the fixed column 3. The rotational movement can also be locked if necessary. Note that this fixed support 3 may be of any type as long as it can be fixed at a desired position during sample collection.

Support legs 6 are provided on the lower surface of the self-supporting main body 1 to project downward. Each of the support legs 6 is provided with a support leg extension/contraction device 5 so as to extend and contract downward from the self-supporting main body 1. The support leg extension/retraction device 5 is a hydraulic cylinder (or electric servo motor), and the piston side thereof is formed in the support leg 6.

The cutting section 2 includes a rotary drive section 11 having a feeding mechanism.
is provided so that its shaft 12 projects downward at right angles from the lower surface of the main body 1, and a drill 13, for example, is attached to the shaft 12 as a cutting tool. The total weight of the main body structure is set to be larger than the reaction force during cutting, and the frictional resistance between the steel plate 30 and the support leg 6 is set to be larger than the maximum cutting torque during cutting. In the figure, 15 is a heat shield plate, and the main body 1
It is installed on.

As shown in FIG. 2, the detection unit 7 includes a reaction force detection sensor (load cell) 1 at an appropriate position on the shaft 12 so as to detect abnormal axial reaction force during cutting with the drill 13.
6 is provided, and an abnormal torque detection sensor (torque meter) 17 is provided to detect abnormal torque of the drill 13 during cutting, and each detected value is
The comparators 18 and 19 compare the respective set values of the normal reaction force setter 20 and the normal torque setter 21, and output a signal when the detected value exceeds the set value. 22 in the figure is an OR circuit, comparator 18,
When a signal is received from one or both of 19, a signal is transmitted to the control section 8 indicating that abnormal cutting resistance has been detected.

Based on the start signal, the control unit 8 sends a signal to the support leg extension/retraction device 5 to lower the support part 6 and move the steel plate 3
0 (hot metal plate) and start the cutting section 2, and in response to the signal from the detection section 7 during cutting, a signal is given to the support leg extension/retraction device 5 to slightly extend the support leg 6. It is designed to be expanded by a predetermined amount. Support leg 6 based on the signal from the detection unit 7
The amount of elongation may be small enough to temporarily reduce or eliminate the cutting resistance at that time.

This sampling device is installed, for example, at a suitable location in the transfer line of a multi-rolling mill, which is installed next to a continuous steel casting mill, with a fixed support provided at a lateral position. When the steel plate 30 (approximately 800°C) from which a sample is to be sampled is transferred onto the transfer roller 14, the self-supporting main body 1 is positioned above it by rotating it around the support 3 from the side standby position. When the start signal is given to the control unit 8, the support legs 6 are extended and stand on the upper surface of the steel plate 30, and in this state, the cutting unit 2 is started and a sample is taken. This is a case of normal cutting.

If an abnormal cutting torque or reaction force larger than normal cutting occurs, the detection section 7 detects this and transmits the abnormality to the control section 8. A signal is given to extend the support leg 6 by a predetermined amount. This causes a force to lift the main body 1, and a frictional resistance corresponding to the cutting resistance is applied to the steel plate 30.
This occurs between the cutting force and the support leg 6, and the drill 13 is relatively retreated, so the cutting resistance temporarily decreases or disappears, and then cutting continues again. Generally, such temporary interruption of cutting often allows the next cutting to be carried out satisfactorily, and in most cases a sample can be collected by repeating this operation one to three times.

In this embodiment, since the self-supporting main body 1 can be moved slightly upward relative to the fixed support 3, even if cutting is interrupted and restarted once, it is not possible to resume good cutting the next time. 2~
If the same operation can be repeated three times and good cutting still cannot be resumed, if the operation is repeated further, the main body 1 will no longer be able to move upward. steel plate 3
The pressing force toward 0 increases than the magnitude due to the body 1's own weight, and the frictional force between the support leg 6 and the steel plate 30 increases, preventing the body 1 from swinging around and overcoming abnormal cutting torque and reaction force. This can be used to overcome conditions such as drill jamming. In addition,
In this case, it is necessary to add a device to limit the maximum pressing force of the support leg 6 against the steel plate 30 by the support leg extension device 5, and a device to stop the rotation of the drill before it is damaged.

Although the above embodiment shows a configuration in which it is possible to press the support leg 6 against the steel plate 30 with a pressure higher than its own weight, this is not necessarily necessary, and if cutting is impossible by redoing the operation, the cutting position can be changed. Since this can often be achieved by making slight changes, the self-supporting main body 1 may be supported by a crane or the like instead of being supported by the fixed support 3.

<Effects of the Invention> According to the present invention, since a sample can be taken at the beginning or during hot working, there is no need to reheat the sample, and the time required for analysis is significantly shortened. Therefore, the analysis results can be quickly fed back to the melting process, reducing losses due to product defects and improving yield.

In addition, since the analysis results can be obtained quickly, it is possible to rationally grade products following the rolling process, and the time from production to shipment is shortened.

Furthermore, since the device according to the present invention is configured to slightly extend the supporting legs and perform the cutting operation again when the cutting resistance increases abnormally, the main body is not swung by the abnormal cutting torque. This method is safe and allows sample collection to be resumed in most cases. This allows for good cutting even when formed into a small and lightweight device, making it possible to provide the device at a very low cost.
Moreover, it can be made so that it does not interfere with the rolling process.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of the main parts of the present invention, and FIG. 2 is a block diagram related to the detection section and control section of the same embodiment. DESCRIPTION OF SYMBOLS 1... Self-supporting main body, 2... Cutting part, 5... Support leg extension/retraction device, 6... Support leg, 7... Detection part, 8...
...control section.

Claims (1)

[Claims] 1. A sample is cut from the hot metal plate using a rotary cutting tool onto a self-supporting main body with support legs projecting downward that extend and contract using a telescoping device so as to come into contact with the upper surface of the hot metal plate on the hot metal plate transfer line. In a sample collecting device provided with a cutting section having an automatic feed mechanism to scrape off the abnormal cutting resistance, the cutting section is provided with an abnormal cutting resistance detection section, and in response to the detection, the support leg is temporarily cut off by the abnormal cutting resistance. 1. A sample collecting device for a hot metal plate, characterized in that it is provided with a control section that slightly stretches the metal plate to the extent that it is reduced or eliminated.