KR20110088081A - Measurement method for surface profile of slab - Google Patents

Measurement method for surface profile of slab Download PDF

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Publication number
KR20110088081A
KR20110088081A KR1020100007813A KR20100007813A KR20110088081A KR 20110088081 A KR20110088081 A KR 20110088081A KR 1020100007813 A KR1020100007813 A KR 1020100007813A KR 20100007813 A KR20100007813 A KR 20100007813A KR 20110088081 A KR20110088081 A KR 20110088081A
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KR
South Korea
Prior art keywords
model
surface shape
slab
mold
steel
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KR1020100007813A
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Korean (ko)
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KR101100443B1 (en
Inventor
도영주
서해영
최주태
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현대제철 주식회사
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Priority to KR20100007813A priority Critical patent/KR101100443B1/en
Publication of KR20110088081A publication Critical patent/KR20110088081A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q

Abstract

The present invention relates to a method for measuring the surface shape of a shaped steel, which enables to accurately measure the surface shape of a slab which is a semi-finished steel stripped product.
Applying a release material to the surface of the semi-finished shaped steel produced by the continuous casting method, and seating the formed mold on the applied release material; Putting an impression material into the inside of the mold and applying pressure downward using a flat pressure plate; After the impression material is hardened to produce a model corresponding to the surface shape of the steel, separating the model from the mold; Measuring the surface shape of the model with the measuring means and separating the surface of the separated model into a measured value; It includes.
According to the present invention, after the surface model of the slab is formed in the yard or the operating place, the measurement value for the surface shape can be obtained by using a non-contact distance meter in a room free of dust or vibration, thereby enabling accurate measurement work as well as a sample. No cutting operation is required, which has a useful effect of improving production efficiency.

Description

METHUREMENT METHOD FOR SURFACE PROFILE OF SLAB

The present invention relates to a method for measuring the shape of the surface of the steel material, and in particular, to enable the quantitative measurement of the surface shape of the slab, which is a scarfed semifinished product, using a model.

In general, continuous casting equipment is for manufacturing molten steel into semi-finished products such as slabs, and is composed of a tundish, a mold, and a plurality of rolls of the machine, and after the molten steel passes through the mold to form a solidified layer, It has a manufacturing process for cooling the surface of the cast piece by spraying the cooling water as it passes between the rolls of players arranged on both sides of the dog.

If the casting is produced by the conventional continuous casting method, the surface temperature management of the casting is very important.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for measuring the surface shape of a steel material which can accurately evaluate the surface quality according to the surface curvature by measuring the surface shape of the scarfed steel material in a quantitative manner.

The present invention for achieving the above object is the step of applying a release material on the surface of the shaped steel material is a semi-finished product, and seating the mold produced on the applied release material,

Putting an impression material in the mold and pressurizing downward using a flat pressure plate;

After the impression material is cured to form a model corresponding to the surface shape of the steel, separating the model from the mold;

Characterized by measuring the surface shape of the model to the model surface of the separated model characterized in that it comprises a step of digitizing the measured value.

As the measuring means, a non-contact distance measuring device of a laser irradiation method is employed.

And multiplying the measured value of the surface shape of the model by −1 to derive the surface measured value of the shaped steel.

According to the present invention, it is possible to accurately measure the surface shape of the slab, which is a semi-finished steel product, which is scarfed. By using the non-contact distance meter to obtain the measurement value for the surface shape, it is possible not only accurate measurement work but also no need for sample cutting work has the useful effect of improving the production efficiency.

1 is a flow chart sequentially showing a method for measuring the surface shape of a steel sheet according to the present invention.
Figure 2 is a state of use showing a state in which the release material is applied to the surface of the slab of the present invention, the impression material is filled in the mold after seating the mold on the upper side of the applied release material.
Figure 3 is a use state diagram showing a state in which pressure is applied to the impression material in the mold of the present invention using a pressure plate.
Figure 4 is a state diagram showing the process of measuring the model surface shape of the present invention using a non-contact distance meter.
5 is a diagram comparing the model measurement value and the measurement of the surface shape of the actual shaped steel.
Figure 6 is a graph comparing the results of measuring the surface profile of the present invention model and the surface of the actual scarfing slab.

In the casting machine, the cast is subjected to bending and straightening during casting, and in this process, a large stress is applied to the surface of the cast.

In addition, while the steel solidifies and cools in molten steel, there is a temperature section in which the toughness of the steel drops rapidly. That is, when the surface temperature of the cast steel in the section to which a large stress is applied becomes a temperature at which toughness drops rapidly, defects may occur on the surface of the cast steel.

When the above surface defects occur in the cast steel, the productivity of the performance of operation is reduced, and in severe cases, the cast steel cannot be used.

As described above, slabs, which are produced as described above, inevitably generate surface defects depending on the ingredients and production conditions. After the grinding process, hot-rolled or cold-rolled coils are produced, or the slabs themselves become products and supplied to other steel companies.

The scarfing process is a surface treatment process in which defects occurring on the surface of the slab are removed by melting the surface of the slab using high pressure oxygen and gas to remove the surface by 1.5 to 4.5 mm.

The scarfing process is carried out by a known scarfing device. Among the conditions under which the scarfing process is performed, the spacing of spraying high pressure oxygen to the upper and lower surfaces of the slab in the upper and lower oxygen injection nozzles of the scarfing device is performed. Scarfing is important. This scarfing distance must be constant so that the entire slab surface can be removed to a certain depth.

By the way, the existing slabs are not curved in parallel to the surface, but bent to have a curvature by the abnormal casting work, accordingly, the scarfing distance for the bending portion during the scarfing process is variable, so that There is a problem that no copying operation is made.

That is, when one of the upper and lower oxygen injection nozzles has a long scarfing distance with the slab surface, oxygen heat lower than the normal scarfing pressure is transmitted to the slab, thereby reducing the heat of oxidation generated from the upper surface of the slab. As a result, the cutting depth of the slab surface is also thinned, and there is a fear that misscaping may occur in which surface defects are not removed.

The slab surface shape after scarfing can be evaluated qualitatively by simply observing the naked eye, but such an evaluation method requires a quantitative evaluation method because a relative evaluation is possible but not quantitative evaluation.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, but here it will be described by adopting a slab as an example of the shaped steel, it can also be applied to other semi-finished steel stripping products.

Method for measuring the shape of the shape steel material according to the present invention will be described with reference to Figures 1 to 4, by applying the release material 110 to the surface of the shaped steel material 10 is a semi-finished product produced by the continuous casting method and scarfed ( S1), and seating the mold 120 manufactured on the applied release material 110; Putting the impression material 130 into the mold 120 (S2) and applying pressure downward using the flat pressing plate 150 (S3); After the impression material 130 is hardened to float the model 200 corresponding to the surface shape of the shaped steel 10, separating the model 200 from the mold 120 (S4); Measuring the surface shape of the model surface by using the measuring means of the separated model 200 and digitizing the measured value (S5); It includes.

In the step of applying pressure downward using the flat platen 150, the impression material 130 is applied as the user presses the pressure plate 150 by hand on the upper side of the impression material 130 filled in the mold 120. Spread evenly on the surface of the slab.

Thereafter, as time passes, the impression material 130 in close contact with the surface of the slab is hardened and hardened to the model 200.

At this time, the release member 110 is preferably applied to the surface of the slab in a larger area than the mold 120.

In addition, the method further includes a step (S6) of deriving the surface measurement value of the shaped steel material 10 by multiplying the measurement value of the surface shape of the model 200 by -1.

The surface shape of the model 200 is, as shown in FIG. 5, the curved portion consisting of the peak 210 and the valley 220 in the model surface is the surface of the actual shape steel (10) (the peak 12 and the valley ( 14)) because it has a structure corresponding to the site, it has a shape opposite to the actual surface of the semi-finished form steel (10).

Accordingly, in order to apply to the actual shape steel 10 product, it is preferable to derive the actual surface measurement value of the shape steel 10 by multiplying -1 by the measurement value measuring the surface shape of the model 200.

Preferably, the measuring means employs a laser irradiation method of the non-contact rangefinder 300, and after the model 200 is separated from the mold 120, the non-contact rangefinder 300 is measured at a measurement location other than the yard. After positioning at a position spaced upwardly from the laser beam, the laser may be irradiated onto the surface of the model 200 and the profile of the model 200 may be measured based on the time at which the irradiated laser was received again.

At this time, the measurement place is preferably measured in the room, not the yard with dust or vibration for accurate measurement.

Measuring method is to move the non-contact distance meter 300 in the horizontal direction from the upper side of the model 200, irradiated a plurality of times the laser and the irradiated laser is reflected back by using the respective times received by the meter 300 and the model surface Adopt the method of measuring the profile surface of the model by measuring the distance of each part.

The measured value of the measured model surface may be output as an electrical signal, or may be output as an image signal through a separate profile generator.

The release member 110 is applied to separate the surface of the model 200 and the slab, for example, may be employed slickon grease.

The impression material 130 may adopt one of Polysulfide, Condensation silicone, Addition silicone (Polyvinyl siloxane), and Polyether, which are classified according to components.

The impression material 130 used in the present invention employs a viscosity of 200 ~ 300cps, and adopting a material within 5 minutes of the curing time, it does not interfere with the operation can be shortened the measurement time.

In addition, since the surface modeling work of the slab is possible without being limited to any part of the long side of the slab, it can be performed a plurality of times after setting the specific position as a reference.

At this time, the minimum length for measuring the surface shape of the slab is preferably carried out at least 250mm in the slab width direction. This is because when less than 250 mm, the localized measurement result is obtained, so that an accurate surface profile cannot be obtained.

FIG. 6 is a graph comparing the results of measuring the surface profile of the actual slaping slab and the surface profile of the model 200. The accuracy of the equation corresponds to 96% of the R 2 value, which is calculated by the accounting analysis. It is very high.

Therefore, the present invention not only accurately evaluates the surface shape profile of the scarfed slab at any position of the long side of the slab, but also has the advantage of performing quantitative evaluation through the surface shape profile.

In addition, while the conventional method requires a sample cutting operation for evaluating the surface shape of the slab, the present invention does not require a sample cutting operation, thereby increasing production efficiency.

In addition, since the model can be obtained while moving when generating the model, the surface shape of several slabs can be evaluated at the same time, thereby saving the evaluation time.

Explanation of symbols on the main parts of the drawings
10: shaped steel 110: mold release material
120: mold 130: impression material
150: platen 200: model
300: contactless distance meter

Claims (3)

Applying a release material on the surface of the semi-finished shaped steel, and seating the manufactured mold on the applied release material;
Putting an impression material in the mold and pressurizing downward using a flat pressure plate;
After the impression material is cured to form a model corresponding to the surface shape of the steel, separating the model from the mold;
And measuring the surface shape of the separated model by the measuring means and quantifying the surface shape of the model. The method according to claim 1,
And a non-contact distance measuring device of a laser irradiation method as the measuring means. The method according to claim 1 or 2,
And multiplying the measurement value of the surface shape of the model by -1 to derive the surface measurement value of the shape steel material.
KR20100007813A 2010-01-28 2010-01-28 Measurement method for surface profile of slab KR101100443B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102589468A (en) * 2012-02-07 2012-07-18 山东理工大学 Modeling method of cartilaginous fish placoid scale groove section profile curve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10137605B2 (en) * 2015-10-01 2018-11-27 United Technologies Corporation System and method for affixing reference dots with respect to modeling impression materials

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003075139A (en) * 2001-09-07 2003-03-12 Ihi Aerospace Engineering Co Ltd Three-dimensional shape measuring device and three- dimensional shape measuring method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102589468A (en) * 2012-02-07 2012-07-18 山东理工大学 Modeling method of cartilaginous fish placoid scale groove section profile curve

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