KR20190062940A - Testing method for calculating driving condition of galvanized steel sheet manufacturing apparatus - Google Patents

Abstract

Disclosed is a testing method for calculating driving conditions of a galvanized steel sheet manufacturing apparatus. According to an embodiment of the present invention, the testing method for calculating driving conditions of a galvanized steel sheet manufacturing apparatus comprises: a step of annealing a steel sheet; a step of allowing the annealed steel sheet to be inserted into a galvanizing chamber and to be galvanized; a step of controlling a galvanizing attachment volume of the galvanized steel sheet; a step of inserting the steel sheet into a nitrogen atmosphere; a step of alloying a galvanizing material and the steel sheet; a step of cooling down the alloyed steel sheet; a step of allowing a measuring unit to measure an SEM, friction factors, corrosion resistance, and galvanizing properties of the alloyed steel sheet; and a step of calculating operating conditions from the measurements by the measuring unit. Thereby, the present invention is able to calculate the optimal operating conditions for production lines before actually operating production lines for galvanized steel sheets, and predict the quality of galvanized steel sheets before actually operating the production lines for galvanized steel sheets.

Description

Technical Field [0001] The present invention relates to a test method for calculating a driving condition of a galvanized steel sheet apparatus,

The present invention relates to a test method for calculating a driving condition of a galvanized steel sheet apparatus, and more particularly, to a method and apparatus for calculating an operating condition of an actual galvanized steel sheet before an actual galvanized steel sheet production line is operated, To a test method for calculating driving conditions of a galvanized steel sheet apparatus capable of predicting quality in a production line.

The galvannealed galvanized steel sheet is superior in weldability to the hot-dip galvanized steel sheet and has a wide surface appearance and is widely used for household appliances and automobile panels.

Recently, high strength steels for automobiles have been developed due to the demand for higher strength of automobile body and structural materials from the viewpoint of improvement of fuel efficiency and stability by automobile weight reduction.

However, despite the development of high strength steels, corrosion problems still exist and plating of steel sheets is still needed. Plating and alloying are carried out in the production line of galvanized steel sheet. It is not easy to obtain the optimal device design conditions according to the zinc plating conditions. If the device is designed and manufactured once and better conditions are found, Costs and time problems arise when changing.

Accordingly, it is necessary to provide a method for predicting quality results before plating in an actual galvanized steel sheet production line and a method for calculating the operating conditions of an optimal galvanized steel sheet production line.

Korean Patent Publication No. 10-2011-0015181 Korean Patent No. 10-0448622 Korean Patent Publication No. 10-2012-0045829

The test method for calculating the driving condition of the zinc-plated steel sheet apparatus according to the embodiment of the present invention is a method for calculating the driving condition of the galvanized steel sheet apparatus which can calculate the optimum production line operating condition before the actual galvanized steel sheet production line is operated And to provide a test method for calculation.

The test method for calculating the driving condition of the zinc-plated steel sheet apparatus according to the embodiment of the present invention is a test method for calculating the driving condition of the galvanized steel sheet apparatus that can predict the quality of the galvanized steel sheet before operating the actual galvanized steel sheet production line And to provide a test method for calculation.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.

A test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention includes: annealing a steel sheet; A step in which the annealed steel sheet is drawn into a plating bath and plated; Adjusting a plating amount of the plated steel sheet; Introducing a steel sheet into a nitrogen atmosphere; Alloying the plating material and the steel sheet; Cooling the alloyed steel sheet; Measuring the SEM measurement, the friction coefficient measurement, the corrosion resistance and the paintability of the alloyed steel sheet; And calculating the operation condition from the measurement result measured by the measurement unit.

Further, in the step of annealing, the temperature of the heat treatment furnace may be changed within a predetermined range at predetermined intervals, and the temperature information of the heat treatment unit may be transmitted to the control unit.

Further, in the alloying step, the temperature of the alloying furnace is changed at regular intervals every predetermined time within a predetermined range, and temperature information of the alloying furnace can be transmitted to the control part.

In addition, in the step of adjusting the plating amount, the pressure of the air knife may be changed at regular intervals within a predetermined range, and the pressure information of the air knife may be transmitted to the control unit.

Further, in the calculating, the controller may calculate the optimum pressure of the air knife, the temperature of the alloying furnace, and the temperature of the heat treatment furnace from the measurement results.

The embodiments of the present invention have at least the following effects.

The test method for calculating the driving condition of the zinc-plated steel sheet apparatus according to the embodiment of the present invention is a method for calculating the driving condition of the galvanized steel sheet apparatus which can calculate the optimum production line operating condition before the actual galvanized steel sheet production line is operated A test method for calculation is provided.

In addition, the quality of the galvanized steel sheet can be predicted before the operation of the actual galvanized steel sheet production line.

In addition, it is possible to easily change the zinc plating conditions, to extract the optimum zinc plating conditions, and to increase the quality of galvanized steel sheets mass-produced by operating the actual plating line (production line) under optimal conditions .

In addition, it is possible to easily change the zinc plating conditions, extract the optimum zinc plating conditions from it, and operate the actual plating line (production line) under optimal conditions, thereby reducing the unnecessary cost in the actual plating line can do.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a flowchart of a test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention.
2 is a schematic diagram of a test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention.
FIGS. 3 and 4 are views schematically showing a plating step and a plating amount adjustment step of a test method for calculating a driving condition of a galvanized steel sheet apparatus according to an embodiment of the present invention.
5 is a schematic explanatory diagram of measurement steps of a test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention.
6 is a schematic explanatory view of a control step of a test method for calculating a driving condition of a galvanized steel sheet apparatus according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described below in detail with reference to the drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in various other forms, including modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Prior to the description, the terms described in the detailed description will be described. In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention. Also, the singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the term " comprises, " or " having ", means that there are features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification, Is not excluded in advance. It should be noted that terms such as " ... unit ", " unit of means ", " part of item ", " absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

Also, in the drawings, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

FIG. 1 is a flowchart of a test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a test method for calculating driving conditions of a galvanized steel sheet apparatus according to an embodiment of the present invention Fig.

The test method (S1000) for calculating the driving condition of the galvanized steel sheet apparatus according to an embodiment of the present invention can calculate the optimal production line operating condition before the actual galvanized steel sheet production line is operated, (S100), a plating step (S200), a plating amount adjustment step (S300), an oxidation film formation prevention step (S400), and the like, which can predict the quality of the galvanized steel sheet before the steel sheet production line is operated. An alloying step S500, a cooling step S600, a measuring step S700, and a calculating step S800.

The annealing treatment step (S100) is a step of annealing the steel sheet through the heat treatment furnace (100). In this embodiment, the steel sheet may be tweed steel. Recently, high strength steels for automobiles have been developed due to the demand for higher strength of automobile body and structural materials from the viewpoint of improvement of fuel efficiency and stability by automobile weight reduction. However, in most steel sheets, the ductility decreases as the strength of the steel increases. As a result, there are many limitations in machining into parts. Many researches have been made to solve the ductility reduction by high strength of these steel plates. As a result, 5 to 35% of manganese is contained in the steel material, and twin is induced when the steel material is subjected to plastic deformation, Austenitic TWIP steel (Twinning Induced Plasticity) has been proposed. Since TWIP steel has a ductility of 60% or more at a high strength of 980 MPa, it is attracting attention as a next generation automotive steel sheet having high strength and high ductility.

The steel sheet is annealed in the heat treatment furnace 100, thereby improving workability. Generally, the cold-rolled steel sheet itself is very hard (hardened) and therefore has a difficulty in processing. At this time, the steel sheet is softened through heat treatment (annealing) to improve workability. Specifically, the hardness is lowered by the recrystallization phenomenon at a high temperature, whereby the workability is improved. The steel sheet that has not undergone the annealing process has high hardness (surface strength) and lacks workability, but the steel sheet of the recrystallized structure produced after annealing has a low hardness, yield point, and tensile strength. In this embodiment, the heat treatment furnace 100 has a temperature of 650 to 850 DEG C, and the steel sheet is annealed by being heated in the heat treatment furnace 100 for a certain period of time. The temperature of the heat treatment furnace 100 is changed at a constant temperature interval between 650 and 850 캜 for a predetermined time interval, and the temperature information is transmitted to the control unit 800. Also, the heating time periodically changes, and this information is also transmitted to the control units 800 and 800. [

FIGS. 3 and 4 are views schematically showing a plating step and a plating amount adjustment step of a test method for calculating a driving condition of a galvanized steel sheet apparatus according to an embodiment of the present invention.

In the plating step S200, the steel sheet annealed in the heat treatment furnace 100 is put into the plating tank 200. [ A plating material in which zinc (Zn) is a major component together with a predetermined proportion of aluminum (Al) or manganese (Mn) is stored in the plating tank 200 and a plating material is plated on the surface of the steel sheet fed into the plating tank 200 do.

The plating amount adjustment step (S300) is a step of adjusting the thickness of the plating material (attached) to the steel sheet in the plating step (S200). In the plating step S200, the steel sheet plated with the plating material is fixed by a stabilizing roll and a collector roll, and each roll pushes the front and back surfaces of the steel sheet and moves toward the air knife 300 side. The air knife 300 is configured to adjust the plating amount of the plating material attached to the surface of the steel sheet passed through the plating tank 200 by using the pressure of air. The air knife 300 is disposed on the plating vessel 200 and includes an air knife chamber and an air knife lip. A galvanized steel sheet having a target plating amount is produced by jetting high-pressure air from the air knife 300 to a steel sheet passed through the plating tank 200. [

The steel sheet plated with the plating material is fixed by the stabilizing roll and the collector roll, and the steel sheet is passed through the air knife rib portion where air is blown out while pushing the front and back surfaces of the steel sheet as flat as possible, There is a great effect in terms of minimizing deviation, product quality after alloying, and cost reduction of zinc adherence.

The plating amount of the plating material is controlled by the pressure of the air knife 300. The pressure of the air knife 300 is changed at regular intervals every predetermined time within a predetermined range. At this time, the pressure of the air knife 300 is continuously transmitted to the control unit 800.

The step of preventing formation of an oxide film (S400) is a step of preventing an oxide coating from being formed on the galvanized steel sheet whose plating amount is adjusted. In the alloying step (S500), the plating material and the steel sheet are alloyed.

During the alloying treatment in the alloying furnace 500, the plating material (zinc) adhered to the steel sheet is re-dissolved, and then the iron particles of the steel sheet are diffused into the plating layer to form zinc-iron intermetallic compound to form a plating layer. However, the plating layer formed on the surface of the steel sheet passing through the plating bath 200 forms a thin oxide film on the surface by bonding with oxygen in the atmosphere. When the zinc plating layer is redissolved during the alloying process, the oxide film layer is not dissolved, So that the flow of the redissolved zinc is not smooth. That is, the solidification rate and coagulation characteristics of molten zinc are uneven due to the oxide film formed on the surface layer, and surface bonds such as flow patterns and cloud patterns are generated, thereby lowering the uniformity, smoothness and gloss of the product.

Therefore, in the oxidation film formation preventing step S400, the steel sheet is passed through the nitrogen furnace 400 disposed between the air knife 300 and the alloy furnace 500 so as to be sealed, Nitrogen is supplied so that the atmosphere in the nitrogen furnace 400 is maintained in the non-oxidizing atmosphere. Therefore, the oxidation reaction of the steel sheet is suppressed to prevent the formation of the oxide film.

The steel sheet fed into the alloying furnace 500 is formed of an intermetallic compound of zinc-iron while the iron particles diffuse into the plating layer to form a plating layer. The temperature of the alloying furnace 500 is changed within a predetermined range at predetermined intervals and the temperature of the alloying furnace 500 is transferred to the control unit 800.

In the cooling step (S600), the galvanized steel sheet is completed after the alloyed steel sheet is cooled.

FIG. 5 is a schematic explanatory diagram of measurement steps of a test method for calculating a drive condition of a galvanized steel sheet apparatus according to an embodiment of the present invention. FIG. 6 is a cross- Fig. 8 is a schematic explanatory diagram of a control step of a test method for condition calculation. Fig.

The measuring step S700 measures the state of the finally-produced galvanized steel sheet through the cooling path through the measuring unit 700. [ Specifically, the SEM measurement, the coefficient of friction measurement, the corrosion resistance and the paintability of the galvanized steel sheet finally produced are measured. The measurement result measured in the measurement step S700 is transmitted to the control unit 800. [

In the calculation step, the control unit 800 extracts optimal process conditions from the measurement results received from the measurement unit 700. [ As described above, in the heat treatment furnace 100, alloy furnace or the like, the temperature is set to change at regular intervals every predetermined time within a predetermined temperature range. In addition, the air knife 300 is provided such that the pressure changes at predetermined intervals within a predetermined pressure. Accordingly, a difference arises in the measurement results of the galvannealed steel sheet as a result of the change in the process conditions in each of the constitutions, and the control unit 800 controls the heat treatment furnace 100 The temperature of the alloying furnace 500, and the pressure of the air knife 300, and provide it to the user.

From this information, the user can design the conditions of the actual production line, and then mass-produce galvanized plywood with excellent quality.

Therefore, according to the present invention, it is possible to calculate the optimum production line operating condition before operating the actual galvanized steel sheet production line, and it is possible to estimate the quality of the galvanized steel sheet before starting the operation of the actual galvanized steel sheet production line. A test method for calculating a drive condition of a steel plate apparatus is provided.

Unless there is explicitly stated or contrary to the description of the steps constituting the method according to the invention, the steps may be carried out in any suitable order. The present invention is not necessarily limited to the order of description of the above steps.

The use of all examples or exemplary language (e.g., etc.) in this invention is for the purpose of describing the present invention only in detail and is not intended to be limited by the scope of the claims, But is not limited thereto. In addition, those skilled in the art will recognize that various modifications, combinations, and alterations may be made depending on design criteria and factors within the scope of the appended claims or equivalents thereof.

Accordingly, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all ranges that are equivalent to or equivalent to the claims of the present invention as well as claims Category.

S1000: Test method for calculation of driving condition of galvanized steel sheet device
S100: annealing step S200: plating step
S300: plating deposition amount adjustment step S400: oxidation film formation prevention step
S500: Alloying step S600: Cooling step
S700: Measuring step S800: Calculation step
100: Heat treatment furnace 200: Plating tank
300: air knife 400: nitrogen
500: Alloying furnace 600: Cooling furnace
700: measuring section 800 control section

Claims (5)

Annealing the steel sheet;
A step in which the annealed steel sheet is drawn into a plating bath and plated;
Adjusting a plating amount of the plated steel sheet;
Introducing a steel sheet into a nitrogen atmosphere;
Alloying the plating material and the steel sheet;
Cooling the alloyed steel sheet;
Measuring the SEM measurement, the friction coefficient measurement, the corrosion resistance and the paintability of the alloyed steel sheet; And
And calculating the operating condition from the measurement result measured by the measuring unit. The method according to claim 1,
Wherein the annealing step includes a step of changing the temperature of the annealing furnace within a predetermined range at predetermined intervals and the temperature information of the annealing section being transmitted to the control section. 3. The method of claim 2,
Wherein the alloying step is performed such that the temperature of the alloying furnace is changed at regular intervals every predetermined time within a predetermined range and temperature information of the alloying furnace is transmitted to the control section. The method of claim 3,
Wherein the step of adjusting the amount of plating is performed by a test method for calculating a driving condition of a galvanized steel plate apparatus in which the pressure of the air knife is changed at regular intervals every predetermined time within a predetermined range, . 5. The method of claim 4,
Wherein the calculating step comprises:
And the controller calculates the optimum air knife pressure, the temperature of the alloy furnace, and the temperature of the heat treatment furnace from the measurement result.

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