JPH0712926Y2 - Template for analysis sample collection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of an analytical sample collecting mold for collecting an analytical sample from hot metal in the process of manufacturing steel.

<Prior art> In the process of steel production, the hot metal produced in a blast furnace, etc.
After being stored in a tope car or a ladle, hot metal pretreatment such as silicon removal is performed. At this time, it is necessary to collect an analytical sample for confirming the chemical composition of the hot metal.

This analysis sample is usually taken by immersing a mold having a structure in which an upper mold and a lower mold are combined and housed in a probe attached to the tip of a rod, into the hot metal to cool and solidify the hot metal that has entered the mold.

One surface of the collected analytical sample is immediately polished by an automatic polishing machine, and automatic analysis of chemical components is performed by fluorescent X-ray analysis and emission spectral analysis. Therefore, in order to perform accurate analysis, it is necessary to have a polished surface with a structure that is as free from segregation as possible.Therefore, the lower mold that comes into contact with the surface on which the analysis sample is polished is made of metal, and at least the surface of the analysis sample is covered by this lower mold. A method of quenching and chilling to a depth sufficiently deeper than the portion to be removed by polishing is used (see, for example, Japanese Utility Model Laid-Open No. 56-9040).

An example of this conventional mold is shown in FIGS. 3 and 4. Third
The figure is an overall sectional view of the mold, and FIG. 4 is a plan view when the upper mold is made of metal. FIG. 5 is an overall view of the sample taken out from the mold. A is a disc-shaped analytical sample, B is a riser, and C is a sample.
Indicates the breakage portion of the feeder and D indicates the rise of the feeder. E is a surface to be polished for analysis.

As shown in FIG. 3, the analytical sample collecting mold is composed of a metallic lower mold 1 and an upper mold 2 mounted on the lower mold 1, and the lower mold 1 has a space 1a for accommodating the analytical sample A. , Again upper mold 2
Has a space 2a that forms an upwardly spread feeder B. When the probe is mounted in this state and immersed in the hot metal, the hot metal fills the spaces 1a and 2a, and at the same time is cooled by the lower mold 1 and rapidly solidifies, and the surface of the analytical sample A is chilled and extremely segregated. It is possible to obtain a solidified hot water with a small amount.

As the upper mold 2, a metal one and a refractory one are used. In any case, in order to remove the feeder B,
The diameter of the connection with the analytical sample A is small so that it can be easily broken.
In the break-off portion C, the unfolded residue is prevented from protruding too much onto the analytical sample A.

<Problems to be solved by the invention> However, the conventional mold has the following problems. That is, the contraction of the feeder B due to the solidification causes the sample A to be analyzed.
Is clamped as if a wedge was driven into the upper mold 2 and the analysis sample A
Becomes impossible. Therefore, as shown in FIG. 4, when the upper die 2 is made of metal, it is necessary to divide the upper die 2 into two pieces so that the upper die 2 can be easily removed.

Since the upper die 2 needs to be machined into the space 2a corresponding to the feeder B at the center thereof, after the lathe machining, as shown in FIG. 4, a slit (a) is machined to divide it. There is a need. This not only requires extra processing costs,
Since it is divided, thermal strain is likely to occur, and a gap is created on the mating surface (a) with the lower mold 1.

Further, when the upper mold 2 is made of a refractory, there is an advantage that the upper mold can be easily taken out by breaking the upper mold when taking out the sample. However, it is difficult for refractory materials to have a smooth surface.
Irregularities are inevitably generated, and in this case also, a gap is formed at the seam (a) with the lower mold 1.

Whether the upper mold 2 is made of metal or refractory,
If a gap is created at the joint (a) with the lower mold 1, the hot metal will penetrate into this gap and cast burrs will adhere to the periphery of the upper surface of the analytical sample A. If this is not removed, the next step is automatically performed. Casting burrs must be removed prior to the aforesaid operations as they interfere with the polishing and automated analysis operations.

This not only increases the number of man-hours, but also delays the feedback of the analysis results, which may have a serious influence on the hot metal pretreatment work. Further, when the upper mold 2 is made of refractory material, the lower end of the feeder B is not easily chilled, and there is a drawback that unfolded portions are likely to occur at the breaking portion C,
This also hindered the work of the next procedure.

An object of the present invention is to provide a template for analysis sample collection that solves the problems of the above-mentioned conventional techniques.

<Means for Solving the Problems> The present invention is made of a metal or refractory made of metal having a metal lower mold for containing an analysis sample and an upper flared riser placed on the lower mold. A mold for analysis sample collection consisting of an upper mold, wherein a metal washer having a thickness of 3 to 10 mm, which is in contact with the upper surface of the analysis sample and forms the lower end of the feeder, is provided between the lower mold and the upper mold. It is a template for analysis sample collection characterized by being interposed.

<Operation> According to the present invention, by interposing a metal washer having a thickness of 3 to 10 mm between the lower die and the upper die, the contact surfaces of the lower die and the washer are sufficiently close to each other. It is possible to finish it smoothly and no gap is created.

Therefore, no casting burr is generated around the upper surface of the analysis sample. Further, the lower end of the feeder is chilled by the metal washer and is easily broken. Therefore, even if the feeder is broken off, no unfolded residue can be left on the upper surface of the analysis sample.

<Embodiment> FIGS. 1 and 2 show a concrete structure of an analytical sample collecting mold according to the present invention. FIG. 1 is a sectional view of the entire mold, and FIG. 2 shows a metal washer. It is a top view.

In FIG. 1, reference numeral 1 denotes a lower mold similar to the conventional one, and having a hollow portion 1a for accommodating an analysis sample A is no different from the conventional one.
Numeral 2 is an upper die for forming the feeder B, and if it is made of metal, it is necessary to divide it into two as in the conventional case. Further, it can be made of an integrated refractory as in the conventional case.

3 is a metal washer according to the present invention. It is necessary to determine the thickness T of the washer 3 on the assumption that thermal strain does not occur due to processing restrictions and heat reception, and that it contributes to chilling of the lower end of the feeder, and the thickness T should be in the range of 3 to 10 mm. Good.

If the washer 3 has a thickness of less than 3 mm, the effect of the chill is small when the upper die 2 is a refractory, and a part of the break-off portion C of the feeder B is likely to remain on the analytical sample A. Become. On the other hand, when the washer 3 has a thickness of more than 10 mm, the riser portion is tightened as if a wedge is driven into the washer 3 due to the contraction caused by the solidification of the molten metal. Problems such as difficulty and breakage from the upper portion of the washer 3 occur.

The metal washer 3 can be manufactured at low cost because it can be processed only by turning. The center hole 3a corresponding to the lower end of the feeder may have the same diameter in the upper and lower directions, but it is better to spread it slightly upward on the upper surface of the desk-shaped analytical sample in which the feeder portion formed by the central hole 3a is formed by 1a. Since it breaks in contact with it, the protrusion of the remaining part of the feeder does not remain on the sample upper surface, which is convenient for the next polishing process.

Next, when the upper mold 2 is made of metal, it is necessary to divide it into two as described above. However, due to thermal strain, a gap is formed on the contact surface with the metal washer 3 and cast burrs are formed on that portion. Even if it happens,
There is no problem because it will be removed as hot water eventually. However, since the processing cost is high, it is preferable to use a refractory material.

On the other hand, even if the upper die 2 is made of a refractory and the lower surface thereof has irregularities and casting burrs occur, there is no problem because the metal washer 3 is interposed between the upper die 2 and the lower die 1 as described above.

The analytical sample-collecting mold of the present invention thus constructed is attached to the probe, immersed in the hot metal such as a toped car to collect the sample, and immediately pulled up. Remove mold 1. If the upper mold 2 is made of metal, the upper mold is divided into two parts. If the upper mold 2 is made of refractory, the refractory remains attached to the lower surface E of the desk-shaped analytical sample A in the axial direction. The feeder part can be easily broken off by hitting.

<Effect of the Invention> The analytical sample collecting mold of the present invention has a thickness of 3 between the lower mold and the upper mold.
Since a metal washer of ~ 10 mm is used, no casting burr is generated around the upper surface of the analysis sample regardless of whether the upper die is made of metal or refractory.

Even if a refractory material is used for the upper mold, the bottom of the riser is sufficiently chilled, so that there is no unfolded residue after breaking the riser, so the entire surface of the analysis sample is smooth. Becomes Therefore, it does not cause any trouble in the automatic polishing process of the surface to be analyzed and the automatic analysis process, and it becomes possible to quickly analyze the chemical components of the hot metal,
Further, there is an advantage that the mold itself can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a drawing showing the entire cross section of an analytical sample collecting mold according to the present invention, FIG. 2 is a plan view of a metal washer of the present invention (as seen from EE in FIG. 1), and FIG. 3 is FIG. 4 is an overall cross-sectional view of a conventional analytical sample collecting mold, FIG. 4 is a plan view of a conventional metal upper mold (viewed from FF in FIG. 3), and FIG. 5 is an overall view of a sample taken out from the mold. . 1 ... Lower mold, 1a ... Lower mold space, 2 ... Upper mold, 2a ... Upper mold space, 3 ... Metal washer, 3a ... Washer center hole, A ... Analytical sample, B ... Riser, C ... break-off part, D ... raised, E ... polished surface.

Continuation of the front page (56) Bibliography Sho 62-32367 (JP, U) Sho 60-86967 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A sample for collecting an analysis sample comprising a metal lower mold for containing an analysis sample, and a metal or refractory upper mold placed on the lower mold and having an upwardly extending feeder section. A metal washer having a thickness of 3 to 10 mm, which is in contact with the upper surface of the analysis sample and forms the lower end of the feeder, is interposed between the lower mold and the upper mold. Template for collecting analytical samples.