KR100360102B1 - Ingot automatic injection method of hot dip galvanizing bath - Google Patents

Abstract

The present invention monitors the complex work unit characteristics of each material coil by product, order plating amount, steel plate size, order weight, etc. in advance by mathematical model, and automatically predicts zinc and aluminum consumption. The present invention relates to an ingot automatic feeding method of a hot dip galvanizing bath which instructs the operation of the ingot and automatically inputs the ingot without an operator's intervention by sending a signal to the ingot feeding device at a proper feeding time.

In the present invention, ingot automatic feeding method of the molten zinc plating bath for automatically injecting the ingot into the molten zinc plating bath by controlling the ingot input device to ingot prepared ingot in the plating bath, the work instruction unit, the operation mode, From the material information showing the plating bath height, aluminum content, steel grade, dimensions, and line speed, the optimum ingot according to the unit area and aluminum consumption of the material is selected according to the prediction formula based on mass balance. In order to maintain the constant, the work order control process to set the point of ingot to be consumed by the dross and the amount of ingots is the same as the weight of ingot. Track the line speed of the material to calculate the total consumption of ingots per unit area , When the reference value is abnormality is made of ingot consumption In process control for applying the input signal to the input device ingot.

Description

Ingot automatic injection method of hot dip galvanizing bath

The present invention relates to a continuous line for producing galvanized steel sheet and alloyed galvanized steel sheet by injecting and melting zinc ingot (INCOT) into the plating bath and plating the molten zinc on the surface of the steel sheet. The present invention relates to an ingot automatic charging method of a hot dip galvanizing bath which can automatically inject a zinc ingot so that an aluminum component as an element can be constantly maintained according to a manufactured product or can be quickly converted and managed.

In the plating process, aluminum is a major element added to the hot dip galvanizing bath in order to secure product surface quality and plating adhesion, and its content is variously determined according to the plating properties to be produced. In addition, since aluminum added in the plating bath has a greater oxygen affinity than zinc, an aluminum oxide (Al ₂ O ₃ ), which is an oxide of aluminum, is continuously formed on the zinc plated surface layer to prevent diffusion of atoms of zinc and oxygen. Play a role.

In addition, since aluminum is highly reactive with iron, it suppresses the formation and development of a brittle zinc-iron alloy layer at the interface between base iron and zinc, and forms a three-alloy system of iron-aluminum-zinc. Therefore, in general, the higher the aluminum concentration in the plating bath, the higher the effective aluminum concentration and the aluminum concentration in the plating layer. That is, the aluminum concentration in the plating alloy layer formed on the base iron and the zinc interface becomes high.

In addition to these characteristics, aluminum improves the SINK ROLL driveability in the plating bath and makes it easy to remove the high density DROSS by turning it into an upper dross.

However, when the aluminum concentration in the plating bath is excessive, the aluminum content becomes high in the plating layer, causing plating defects such as flow patterns, and deteriorating weldability. Therefore, management to limit the aluminum concentration is necessary.

In addition, since the amount of aluminum in the plating bath varies according to the demanded product, order plating amount, steel plate size, and order weight, the aluminum content is conventionally maintained for constant maintenance of aluminum or for rapid conversion management according to product conversion. Different types of ingots are used, the proper input cost standards for each type of ingots are set, and a predetermined amount of ingots are input at the discretion of the operator based on computerized information and input criteria for the material, and plating through periodic plating bath concentration analysis The adjustment of the concentration of aluminum in the bath was carried out.

For example, when changing the product from galvanized steel sheet (GI) to galvanized steel sheet (GA), in order to adjust to the appropriate plating bath standard of the galvanized steel sheet, the aluminum in the plating bath is subjected to downward work and zinc alloyed. When changing from galvanized steel sheet (GA) to galvanized steel sheet (GI), perform aluminum upward work.

As a result, it is difficult to control the complex changes of material coils such as order plating, steel plate size, and order weight of work materials, and process analysis requires at least 4 hours. In case of exceeding the range, the possibility of defects increases due to delayed adjustment work, and above all, it is necessary to rely on the experience and judgment of the operator.Therefore, there is a problem due to the worker's judgment error and the automatic input function of the ingot input device is not used. Work unit characteristics are not taken into account and not in use).

Therefore, the present invention has been devised to solve the above-mentioned conventional problems, and its purpose is to pre-compute complex work unit characteristics by material coil such as product material, order plating amount, steel plate dimension, order weight, etc. by mathematical model. Monitors, automatically predicts zinc and aluminum concentrations, and instructs on-line work on the types of ingots to be injected online, and sends the signal to the ingot input device at the appropriate injection time to automatically input the ingots without operator intervention to schedule the aluminum in the hot dip bath. It is to provide an ingot automatic injection method of hot dip galvanizing bath that can be managed by producing a hot dip galvanized product.

1 is a schematic diagram showing a basic prediction equation for estimating ingot consumption by plating and dross for each working mode.

Figure 2 is a graph showing the amount of aluminum deposition by order plating amount.

3 is a graph showing zinc concentration control by material throughput in a plating bath.

Figure 4 is a flow chart showing the work flow performed in the business computer according to the present invention.

Figure 5 is a flow chart showing the automatic injection control flow made in the ingot automatic injection control apparatus according to the present invention.

6 is a block diagram illustrating an interface between work units in accordance with the present invention.

* Description of the symbols for the main parts of the drawings *

601: Worker

602 Business Computer

603: Ingot automatic feeding control device

604: Ingot input device

605: plating bath

As a technical means for achieving the object of the present invention described above, the present invention controls the ingot input device for injecting the ingot prepared by the operator into the plating bath to automatically inject the ingot into the molten zinc plating bath hot dip galvanizing bath Ingot automatic injection method of,

Optimal ingots by predicting ingots and aluminum concentrations per unit area of material by predicting equations based on mass flow from material information indicating work order unit, work mode, plating bath height, aluminum composition, steel grade, dimensions, and line speed A work instruction control process of setting the time when the amount of ingot consumed by the plating and dross is equal to the weight of one ingot so as to maintain the height in the plating bath at the same time as the weight of the ingot, and then give the ingot input work instruction;

Ingot input operation instructions are characterized by consisting of an ingot input control process that tracks the line speed of the current work material, calculates the total amount of ingots per unit area, and applies an input signal to the ingot input device when the reference value is consumed. .

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to attached drawing.

1 is a schematic view showing a basic formula used to predict the ingot consumption and aluminum consumption in the automatic injection method according to the present invention, the ingot consumption and aluminum consumption prediction equation, the ingot consumption by plating and dross according to the working mode, aluminum The consumption amount is, that is, the sum of the ingot (zinc) and aluminum consumed by plating and the ingot (zinc) and aluminum consumed to dross are equal to the injected ingot (zinc) and aluminum. mass flow balance).

In the above, the amount of ingots (zinc) deposited by plating is more than the order plating amount, which is selected as the average adhesion amount performance by order plating amount. In addition, the aluminum consumption by plating and dross is proportionally higher as the aluminum component in the plating bath is higher as a result of performance analysis for each working mode, and is proportionally increased as the amount of plating is increased. In addition, the dross generation amount increases in proportion to the material length passing through the plating bath within the same time. That is, in the case of the same weight, the smaller the thickness and width of the material, the greater the amount of dross generated.

Figure 2 is a graph showing the amount of aluminum attached to each order plating amount in the plating bath, it can be seen that the increase in the gradient of aluminum is about 0.0015 depending on the order plating amount. Here, it can be seen that the amount of aluminum is almost uniformly adhered to the increase in the order plating amount, and the higher the plating amount, the lower the ingot of the aluminum content, and the higher the plating amount, the higher the aluminum content of the ingot. It shows that the aluminum concentration in the plating bath can be managed constantly.

FIG. 3 shows the zinc concentration control according to material throughput in the plating bath, and based on the prediction equation as shown in FIG. 1, an ingot based on material characteristics (dimensions, order plating amount, etc.) and an optimal ingot according to aluminum consumption are shown. In order to select and keep the height in the plating bath constant, the basic unit of all calculations is to calculate the material area of 10 square meters.

In the zinc fluctuation value shown in FIG. 3, the deviation (absolute value) from the target value is added for each 10 square meter period of the work area, and the ingot having the minimum value is selected as the optimal ingot. In addition, the ingot is set at the point of time when the amount of ingot consumed by plating and dross is equal to the weight of one ingot for plating bath height schedule management.

Figure 4 is a flow chart showing a work order flow made in the ingot automatic injection control apparatus according to the present invention, the work command operation is performed as follows.

The operator starts the device (reset key), inputs a work instruction unit (working material information), a work mode, a plating bath height, and a plating bath aluminum component (step 401).

Then, the automatic feeding control device 603 reads the input data and line speed table information for each material characteristic (steel grade, size), calculates mass balance and required period per unit area, and selects one of several types of ingots. Ingot calculation periods for the selected ingot are calculated (steps 402 to 404).

Then, it is checked whether there is an area exceeding the upper and lower limit management ranges in the aluminum concentration for each working mode or the plating bath height at the time of inputting the selected ingot (step 405). At this time, if there is an excess part, the ingot is reselected to another kind, and as in step 404, the ingot required period for the selected ingot is recalculated (step 406), and the aluminum concentration change amount when the changed-selected ingot is added. It is again checked whether there is an area exceeding the upper and lower management ranges in the plating bath height and the like (step 407).

As a result of the rechecking, if there is a part exceeding the upper and lower limit management ranges, the next step 408 checks whether the plating bath height can be changed.

At this time, if it is impossible to change the plating bath height, in step 409, if the adjustment of the plating bath height is output, and if the plating bath height adjustment is possible, in step 410, after adjusting the plating bath height, in the next step 411, the adjusted plating Reselect another ingot to match bath height and recalculate.

Then, in step 412, it is again checked whether there is an area where the aluminum concentration or the plating bath height exceeds the upper and lower management ranges. Here, if there is an area exceeding the management range, a non-adjustment message is output in step 413.

Predictive comparison of the changes in the plating bath for each of the various types of ingots as described above selects an optimal ingot that the aluminum concentration or the plating bath height does not deviate from the management range.

Thus, when the optimal ingot is selected, the process proceeds to step 414, where the calculated result is transmitted to the business computer serving as the upper management device, and in step 415, it is reflected in the work order.

Next, in step 416, it is checked whether there is a change by the external change signal (reset signal), and if there is no change, the ingot input operation is instructed together with the information about the ingot to be previously calculated.

In the above, the worker prepares an ingot based on an ingot input operation instruction. When the external input data such as the work instruction unit is changed, the reset key is terminated, and the device is restarted again, thereby repeating from the initial step 401 again.

In addition to the work instruction control flow as described above, the ingot automatic injection control shown in Fig. 5 takes place, which is an initial step, in which the operator starts the device in step 501 (reset key) and the work instruction unit Enter the (Material Information to Work), Work Mode, Plating Bath Height, and Plating Bath Aluminum Components.

As described above, in the state in which the basic information is input, it is checked in step 502 whether the ingot information to be input together with the ingot work instruction is input from the ingot work instruction control flow shown in FIG.

In the above, if there is a work instruction, in step 503, work information and external input information such as ingot information applied together with the ingot work instruction are read, and in step 504, the line speed for each work material is tracked.

Next, in step 505, the total consumption of Ingo soil per unit area is calculated based on the mass balance of each work material coil shown in FIG.

At the same time in step 506 and step 508, it is checked whether 10 minutes of the predicted aluminum concentration output cycle has elapsed and whether the total amount of ingots consumed by the plating dross is equal to or greater than the weight of one ingot.

In the above, if 10 minutes have not elapsed or the consumption by the plating dross is not more than the weight (1.14 tons) of one ingot, the flow returns to the step 505, and the consumption per unit area is recalculated in consideration of the flow of input time.

In this case, if 10 minutes have elapsed, in step 507, if the predicted aluminum value calculated after 10 minutes has elapsed and the consumption amount of the plating dross is equal to or greater than the weight of one ingot inputted (for example, 1.14 tons), In step 509, an instruction for injecting the ingot into the ingot input device is given, and in step 510, the type and the input time of the ingot are added.

Then, in step 511, it is checked whether there is a change in external input items (i.e., a reset signal), and if not, the process returns to step 505 and repeats from the mass pro balance calculation step per unit area to continue controlling the ingot automatic input. If there is a change, the program ends.

As shown in FIG. 6, the actual ingot input process performed according to the work input method as described above is performed by the operator 601 managing the plating equipment and the business computer 602, which is a high-level computer managing the work schedule according to the order. 4 and 5, an ingot automatic input control device 603 for automatically injecting by setting the ingot type, a feeding amount, an input time, and the like, and an ingot input device for putting the actual ingot into the plating bath ( 604 and the plating bath 605 in which the plating operation is set on the work material are made through a repetitive interface, which will be described in this order as follows.

1) The operator 601 checks the state of the plating bath 605 before starting work to check the height of the plating bath, the current aluminum concentration value, and the working mode.

2) The worker 601 confirms the work instruction unit and the material information to work from the business computer 602.

3) After the operator 601 starts the ingot automatic feeding control device 603, the operator inputs the contents checked in 1) and 2) according to the instruction message. At this time, when correcting the input, press the reset key to restart.

4) The ingot automatic feed control device 603 receives the material information and line tracking information from the business computer 602 according to the work instruction control flow shown in FIG. 4, so that the aluminum concentration or the plating bath height does not fall within the management range. Calculate the type of ingot to avoid and the predicted aluminum concentration.

5) The operator 601 confirms the ingot input work instruction from the ingot automatic input control device 603 and the predicted aluminum concentration value calculated for each 10-minute cycle and the type of ingot for each input time.

6) The operator 601 sorts the types of ingots according to the order of ingot input operation, and prepares them in the ingot input apparatus 604 according to the order of ingot input.

7) The ingot automatic input control device 603 calculates the ingot input time according to the ingot automatic input instruction control flow as shown in Fig. 5, and sends the input instruction to the ingot input device 604 at the calculated input time.

8) The ingot pouring device 604 automatically injects the ingot prepared by the worker 601 into the plating bath 605 when instructed to do so.

As described above, according to the present invention, unlike the work management method that was dependent on the operator's experience and judgment about the complicated change of each material coil, such as the order plating amount of the work material, steel plate dimensions, order interruption, automatic galvanizing bath automatic Standardization and fine control of work by input device enables quick and constant management of target aluminum concentration for each work mode. Problems in the production of galvanized steel (GA) and galvanized steel (G1) materials, especially automotive exterior materials It is possible to realize the high quality of the hot-dip galvanized product by reducing the plating bath defects, and to reduce the worker's work load through the use of the automatic feeding function, thereby improving the productivity.

Claims (4)

In the ingot automatic feeding method of the hot dip galvanizing bath in which the ingot is prepared by the operator to control the ingot pouring device for feeding the ingot into the hot dip galvanizing bath by controlling the ingot pouring device, From the material information indicating the work order unit, work mode, plating bath height, aluminum composition, steel grade, dimensions, and line speed, the ingot based on the mass area of the material and the optimum ingot according to the aluminum consumption are calculated by the prediction formula based on mass balance. A work instruction control process for selecting an ingot input operation point by selecting a time point at which the ingot amount consumed by plating and dross to be equal to the weight of one ingot for selecting and maintaining a constant height in the plating bath; Ingot input work instruction, which consists of ingot input control process that tracks the line speed of the current work material, calculates the ingot consumption per unit area, and applies an input signal to the ingot input device when the reference value is consumed. Ingot automatic feeding method of galvanizing bath. The process of claim 1, wherein A first step of receiving a work instruction unit, a work mode, a plating bath height, an aluminum component, and inputting a steel grade, dimension, line speed, etc. of the work material; A second step of selecting an optimal ingot type for each step by calculating the mass balance and the required period per unit area of the work material from the input information; A third step of checking whether there is an area in which the amount of aluminum for each work mode exceeds the upper and lower management ranges; A fourth step of reselecting the ingot of the previous step and rechecking whether there is an area exceeding the proper management range if there is an excess part; After rechecking, there is an area exceeding the management range, and it is checked whether the plating bath height can be changed, and if it is impossible to change the plating bath, the message is not adjustable and if the plating bath can be changed, the ingot is changed after the plating bath height is changed. To choose the fifth step, If there is no area exceeding the management range by the above, the ingot automatic charging method of the hot dip galvanizing bath, characterized in that the sixth step of outputting a work instruction with the selected ingot type. The method of claim 1, wherein the ingot injection control process A first step of receiving a work instruction unit, a work mode, a plating bath height, and an aluminum component; A second step of checking whether there is an ingot input instruction from the work instruction control process and reading work information of the current work material and tracking a line speed if there is an input instruction; A third step of calculating the mass balance per unit area to check whether the ingot injection time has elapsed for a predetermined time and whether the amount of ingot consumption exceeds a predetermined amount; In the step, the fourth step of outputting the estimated amount of aluminum whenever the ingot input time elapses a predetermined time, A fifth step of outputting an input signal to the ingot input device when the amount of ingot consumption exceeds a predetermined amount, and outputting the type of ingot and the input time; Ingot automatic charging method of the hot dip galvanizing bath, characterized in that consisting of a sixth step of repeating the third step to the fifth step until a change occurs. The method according to claim 1 or 2, The work instruction process is to add the variation (absolute value) between zinc or aluminum variation and the target value by unit area cycle of the work material to select an ingot having the minimum value as an optimal ingot, and to manage the plating bath height uniformly. An ingot automatic charging method of a hot dip galvanizing bath, characterized in that the time at which the ingot is consumed by plating and dross is equal to the weight of one ingot is set at the ingot input time.