JP2005213625A - Method and device for regulating medicament concentration in surface treatment apparatus for steel product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the degradation in treatment capability by enabling to suppress the variation in medicament concentration to a lower level without measuring the medicament concentration in a treating liquid and eliminating the loss time accompanying the concentration measurement. <P>SOLUTION: The treating liquid is stored in a treating vessel 14 and a coiled wire 10 is immersed into the treating liquid. When the first or second accumulated treatment surface area of the coiled wire 10 treated in the treating vessel 14 attains the preset corresponding first or second threshold, a replenishing command is outputted to first or second controllers 20 and 22 of corresponding first or second medicament feeders 16 and 18 from a sequencer. The first and second feeders 16 and 18 replenish corresponding base agents or accelerators by a preset amount at a constant rate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chemical concentration adjusting method and apparatus in a steel surface treatment apparatus for performing surface treatment of steel materials such as steel slabs and steel wires.

  As a pre-process for drawing a steel wire rod (steel material), pickling treatment for removing scale adhered to the surface of the wire rod and coating treatment for forming a lubricious coating on the surface of the wire rod are performed. In this coating treatment, nitrite is added as a accelerating agent (drug) having a crystal accelerating action to a treatment solution mainly composed of zinc phosphate as a main agent (drug), and a coiled wire is added to the treatment solution. By soaking, a zinc phosphate coating as a lubricating coating is deposited on the surface of the wire, and smoothing of the wire drawing by a die in a subsequent process is achieved.

  In the continuous pickling / coating line where the pickling treatment and coating treatment are performed continuously, the concentration control of the chemicals in the treatment liquid in each treatment is adjusted by replenishing the necessary chemicals based on periodic analysis. Is generally performed.

For example, Patent Literature 1 exists as a pickling treatment method and apparatus for the wire.
JP 2000-192300 A

  The decrease in the concentration of the chemical in the treatment liquid in the pickling treatment or coating treatment decreases with the amount of processing of the wire, and therefore there is a problem in that the concentration varies greatly in the analysis of a certain period, resulting in variations in product quality. Therefore, it is possible to keep the variation in drug concentration within an allowable range by shortening the cycle of analysis → concentration adjustment and increasing the adjustment frequency.

  In this case, in the pickling treatment, the above problem can be addressed by continuously measuring the drug concentration using an automatic concentration measuring device and replenishing the drug based on the measured value. However, the nitrite group used as an accelerator in the coating treatment is easily combined with iron ions released from the surface of the wire due to the etching action of the acid in the treatment solution and sludged, and an automatic concentration measuring machine was used. In such a case, sludge adheres to the device and causes clogging and the like, making concentration measurement impossible, and it is extremely difficult to perform continuous concentration measurement. In other words, the analysis of the processing liquid in the coating process is that the operator separates the processing liquid into the beaker and analyzes this processing liquid outside, and the frequency of adjustment is increased by shortening the cycle of analysis → concentration adjustment. This resulted in an increase in work man-hours and extremely low efficiency.

  Here, the concentration of the nitrite group is set to a high level, and the time required for the accelerator concentration to fall outside the allowable range is lengthened, thereby extending the period of analysis → concentration adjustment. Can be considered. However, as described above, nitrite is easily sludged by combining with iron ions, so even if the concentration of the nitrite is increased, the excess portion is combined with iron ions and sludged to form sludge. The concentration decreases and cannot contribute to lengthening the period of analysis → concentration adjustment. In addition, if a large amount of sludge is accumulated on the inner bottom surface of the treatment tank, this sludge adheres to the wire rod, and there is a problem that causes problems in post-treatment. For example, in the conventional coating process, since sludge is accumulated up to about 1/3 of the treatment tank in one month, the sludge is removed once every three weeks. Since this sludge removal takes about 6 hours, the entire line must be stopped during that time, and there is a problem that the processing capacity is lowered.

  Therefore, the inventors of the present application have sought various solutions for the solution of the above problems, and the reduction in the concentration of various chemicals in the treatment liquid corresponds to the surface area of the steel material to be treated. It was found that the variation in drug concentration can be within an acceptable range by supplementing the drug.

  That is, the present invention has been proposed in view of the above-described problems inherent in the above-described conventional technology, and is intended to solve this problem suitably, and measures the concentration of a drug in a processing solution based on the above-described knowledge. Disclosed is a method and an apparatus for adjusting the concentration of a chemical in a surface treatment apparatus for steel, which can suppress the variation in the chemical concentration without any loss and can prevent loss of processing time due to the loss of concentration measurement. With the goal.

In order to overcome the above-mentioned problems and achieve the desired purpose suitably, the chemical concentration adjusting method in the steel material surface treatment apparatus according to the present invention,
A treatment liquid containing a chemical is stored in a treatment tank, and by immersing a steel material such as a steel slab or a steel wire in the treatment liquid, a chemical concentration adjustment method for a surface treatment apparatus that performs the surface treatment,
The cumulative processing surface area of the steel material immersed in the processing liquid is calculated, and the chemical is replenished when the calculated cumulative processing surface area reaches a preset threshold value.

In order to overcome the above-mentioned problems and achieve the intended purpose suitably, the chemical concentration adjusting apparatus in the steel material surface treatment apparatus according to another invention of the present application,
A treatment liquid containing a chemical is stored in a treatment tank, and by immersing a steel material such as a steel slab or a steel wire in the treatment liquid, a chemical concentration adjusting device of a surface treatment device that performs the surface treatment,
A calculation unit for calculating the cumulative treatment surface area of the steel material immersed in the treatment liquid;
A comparison unit that compares the calculated value calculated by the calculation unit with a preset threshold;
A drug supply device capable of supplying a drug into the treatment tank;
The comparison result in the comparison unit is characterized by comprising control means for controlling the operation of the medicine supply device to replenish the medicine in the treatment tank when the accumulated treatment surface area has reached a threshold value. .

  According to the chemical concentration adjusting method and apparatus in the steel surface treatment apparatus according to the present invention, since the chemical is replenished based on the cumulative processing surface area of the steel material immersed in the treatment liquid, the chemical concentration is actually measured. There is no need to do this, and the loss time associated with the measurement can be eliminated to prevent a reduction in processing capacity. In addition, since the accumulated processing surface area corresponding to each of the plurality of medicines can be calculated and the corresponding medicine can be replenished based on the calculated cumulative processing surface area, variation in the concentration of each medicine can be suppressed to be small. In particular, when using chemicals that are easily sludged by combining with other components in the treatment liquid, the concentration can be adjusted without measuring the chemical concentration. It is possible to prevent efficiency.

  Moreover, according to the chemical | medical agent supply apparatus comprised so that a chemical | medical agent might be replenished with a fixed supply speed | velocity | rate, the sludge formation of a chemical | medical agent can be suppressed. Therefore, the generation of a large amount of sludge can suppress a reduction in processing capacity due to a shortening of the sludge removal cycle.

  Next, a chemical concentration adjusting method and apparatus in a steel surface treatment apparatus according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. In the embodiment, a case will be described in which the surface treatment apparatus is a film treatment apparatus that performs a film treatment for forming a lubricating film on the surface of a wire.

  FIG. 1 shows a schematic configuration of a film processing apparatus employing a chemical concentration adjusting apparatus according to an embodiment. The film processing apparatus includes a coiled wire material (hereinafter referred to as a coiled wire material) as a heat-treated steel material. It is installed in a continuous pickling / coating line capable of continuously performing 10 pickling treatments and coating treatments. The coiled wire 10 is transported along the line while being suspended by a hook 12 of a transporter provided movably above the line, and is stopped above each tank installed on the line. Composed. Further, the hook 12 is configured to be movable up and down by an elevating device provided in the transporter, and is lowered from the moving position to the processing position above each tank, whereby the suspended coiled wire 10 is processed in each tank. It can be immersed in the liquid.

  In the treatment tank 14 in the coating treatment apparatus, a predetermined amount of a treatment liquid containing zinc phosphate as a main ingredient (drug) as a main component and nitrite as a promoter (drug) is stored. By immersing the coiled wire rod 10 for a predetermined time, a zinc phosphate coating is deposited on the surface as a lubricating coating.

  The treatment tank 14 is provided with a first drug supply device 16 for the main agent and a second drug supply device 18 for the accelerator, and a zinc phosphate solution or a nitrite group is supplied from each of the supply devices 16 and 18. The solution is configured to be automatically replenished into the processing tank 14. 1st and 2nd chemical | medical agent supply apparatuses 16 and 18 are provided with the 1st and 2nd controllers 20 and 22 corresponding to the supply amount and supply speed of zinc phosphate and nitrite radicals correspondingly, A replenishment signal is input from a sequencer 24 as control means for controlling the entire line, which will be described later. Further, the treatment tank 14 is provided with a stirring device 28 equipped with a stirring screw 26, and is configured so that the concentration distribution can be made uniform by rotating the stirring screw 26 and stirring the processing liquid.

  The sequencer 24 sets and stores various information (processing pattern, wire diameter, weight, etc.) related to each coiled wire 10 supplied to the continuous pickling / coating line, and the surface area of each coiled wire 10 is determined from the information. It is comprised so that can be calculated. Further, as shown in FIG. 2, the sequencer 24 corresponds to the first cumulative processing surface area N1 and the nitrite group (accelerator) corresponding to the zinc phosphate (main agent) of the coiled wire 10 to be immersed in the processing tank 14. The first calculation unit 30 and the second calculation unit 32 that calculate the second cumulative processing surface area N2 are provided. Further, the sequencer 24 compares the first threshold value M1 set in advance corresponding to the first cumulative processing surface area N1 with the first cumulative processing surface area N1 calculated by the first calculation unit 30. And a second comparison unit 36 that compares a second threshold M2 set in advance corresponding to the second cumulative processing surface area N2 and the second cumulative processing surface area N2 calculated by the second calculation unit 32. When the comparison results in the comparison units 34 and 36 indicate that the first or second cumulative processing surface areas N1 and N2 have reached the first or second threshold values M1 and M2, the sequencer 24 It is set to output a replenishment command to the controllers 20 and 22 of the medicine supply devices 16 and 18. Each controller 20 and 22 to which a replenishment command is input from the sequencer 24 is set to replenish a predetermined amount of zinc phosphate (main agent) or nitrite (accelerator) at a constant rate. . In this case, the nitrite supply rate by the second drug supply device 18 is preferably 8 to 12 ml / min, for example.

  Here, as described above, the concentrations of zinc phosphate (main agent) and nitrite (accelerator) in the treatment liquid are reduced according to the surface area of the treated coiled wire 10, and the amount of reduction is the treatment surface area. Can be predicted and can be obtained by experiment. That is, from the concentration range required for zinc phosphate and nitrite and the amount of decrease in concentration corresponding to the treatment surface area, the first or second cumulative treatment surface area N1, N2 is the first or second threshold value M1, M2. The replenishment amount of zinc phosphate and nitrite to be replenished when reaching the above can be set.

(Effects of Example)
Next, the operation of the drug concentration adjusting apparatus according to the above-described embodiment will be described with reference to the flowcharts of FIGS. 3 and 4 in relation to the drug concentration adjusting method.

  In the continuous pickling / coating line, various types of information on the coiled wire 10 suspended from the transporter that has arrived from the previous process are managed by the sequencer 24, and a processing pattern corresponding to the coiled wire 10 is used. By controlling the movement of the conveyor, the coiled wire 10 is subjected to pickling or coating. Depending on the type of the coiled wire 10, there are some that do not perform the coating treatment.

  In the sequencer 24, the first and second calculation units 30 and 32 accumulate the treatment surface areas of the coiled wire 10 to be coated, and calculate the first and second accumulation treatment surface areas N1 and N2. (S10, S20). In the first and second comparison units 34 and 36, the first or second cumulative processing surface areas N1 and N2 calculated by the corresponding first and second calculation units 30 and 32, and the first or second threshold value are used. M1 and M2 are compared, and if the processing surface areas N1 and N2 have not reached the threshold values M1 and M2 (NO in S11 and S21), then the sequencer 24 is the first of the first and second drug supply devices 16 and 18. And no replenishment command is output to the second controllers 20 and 22.

  In the transfer machine that has reached the upper side of the treatment tank 14, the coil wire 10 is immersed in the treatment liquid by lowering the hook 12 from the moving position to the lowered position, and after a predetermined time has passed, Move towards the next processing step. In this coating treatment, a zinc phosphate coating is deposited on the surface of the coiled wire 10. And the density | concentration of the zinc phosphate and nitrite in the said process liquid falls by the surface treatment of the coil-shaped wire 10 being repeated in the said processing tank 14. FIG.

  In the sequencer 24, each time a new coiled wire 10 that performs coating processing on a continuous pickling / coating line arrives, the first and second calculation surface areas N1 in the first and second calculation units 30 and 32 , N2 is calculated, and the comparison result in the first or second comparison unit 34, 36 reaches the first or second threshold value M1, M2 corresponding to the first or second cumulative processing surface area N1, N2. If so (YES in S11 and S21), a replenishment command is output to the controllers 20 and 22 of the corresponding medicine supply devices 16 and 18. That is, when the first cumulative processing surface area N1 reaches the first threshold value M1, a replenishment command is output to the first controller 20 of the first drug supply device 16, and a predetermined amount of phosphoric acid is output from the first drug supply device 16. Zinc is replenished into the processing solution at a constant rate (S12). When the second cumulative processing surface area N2 reaches the second threshold value M2, a replenishment command is output to the second controller 22 of the second drug supply device 18, and a predetermined amount of nitrous acid is supplied from the second drug supply device 18. The roots are replenished into the processing solution at a constant rate (S22).

  When zinc phosphate (main agent) or nitrite (accelerator) is supplemented, the corresponding first or second cumulative surface area N1, N2 is reset (S13, S23), and the above-described flow is repeated. .

  In the drug concentration adjusting apparatus of the embodiment, since it is not necessary to actually measure the drug concentration in the processing liquid, the processing capacity does not decrease by increasing the adjustment frequency. That is, in the treatment liquid using nitrite as an accelerator as in the example, since the nitrite binds to iron ions and sludges, automatic concentration measurement is extremely difficult. Although it takes time, since the analysis is unnecessary in the drug concentration adjusting apparatus of the embodiment, the processing time is improved by eliminating the loss time associated with the analysis. Further, in the embodiment, every time the coiled wire 10 arrives at the continuous pickling / coating line, it is determined whether or not it is necessary to replenish the treatment liquid with the chemical, so that the coiled wire is replenished. Before the 10 is actually immersed in the treatment liquid, the chemical concentration in the treatment liquid can be adjusted, and the coiled wire 10 can always be surface-treated under the optimum conditions.

  Moreover, the chemical | medical agent density | concentration in a process liquid can be changed by changing the setting of the said 1st and 2nd threshold value M1, M2. Therefore, the second threshold value M2 corresponding to the nitrite root that generates a large amount of sludge due to the increase in the concentration is set to a concentration near the lower limit within the concentration range allowed for the nitrite root. If this is done, the amount of sludge generated can be reduced. And since the generation amount of sludge is reduced, it is possible to set a longer period for performing the sludge removal operation, and it is possible to reduce the loss time associated with the removal operation and improve the processing capability. Furthermore, especially by replenishing nitrite at a constant supply rate, the nitrite is prevented from binding to iron ions and sludged without acting to promote deposition of the zinc phosphate coating. The

  Here, the iron ions contained in the sludge react with the nitrite radicals, and the concentration of the nitrite radicals decreases, so that a large amount of sludge reduces the nitrite radical concentration further, and the replenishment interval More nitrite radicals are needed due to the shorter length. However, as described above, by setting the concentration of the nitrite group near the lower limit, it is possible to suppress the decrease in the concentration of the nitrite group in combination with the reduction of sludge, and to reduce its basic unit. It becomes possible.

  In the embodiment, the case where the drug concentration is adjusted in the treatment liquid used for the coating treatment has been described. In addition, the treatment liquid does not need to be a plurality of types (two or more types), and may be a single type. In addition, although the Example demonstrated for the film processing apparatus provided in the pickling and the film line, the film processing apparatus may be provided independently. Further, the steel material to be processed may be a rod-like or block-like one instead of a coiled wire.

It is a schematic block diagram which shows the film processing apparatus which employ | adopted the chemical | medical agent concentration adjustment apparatus which concerns on an Example. It is a block diagram which shows the control system of the chemical | medical agent concentration adjustment apparatus which concerns on an Example. It is a flowchart figure in the case of adjusting the density | concentration of a main ingredient with the chemical | medical agent concentration adjustment apparatus which concerns on an Example. It is a flowchart figure in the case of adjusting the density | concentration of a promoter by the chemical | medical agent concentration adjustment apparatus which concerns on an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coiled wire (steel material), 14 processing tank, 16 1st chemical | medical agent supply apparatus 18 2nd chemical | medical agent supply apparatus, 24 sequencer (control means), 30 1st calculation part 32 2nd calculation part, 34 1st comparison part, 36 2nd comparison part, N1 1st accumulation processing surface area N2 2nd accumulation processing surface area, M1 1st threshold value, M2 2nd threshold value

Claims (6)

A treatment liquid containing a chemical is stored in a treatment tank (14), and a chemical concentration adjusting method for a surface treatment apparatus that performs surface treatment by immersing a steel material (10) such as a steel piece or steel wire in the treatment liquid. Because
The cumulative treatment surface area (N1, N2) of the steel material (10) immersed in the treatment liquid is calculated, and the calculated cumulative treatment surface area (N1, N2) is set to a preset threshold value (M1, M2). A chemical concentration adjusting method in a steel surface treatment apparatus, wherein a chemical is replenished when the chemical reaches the surface.   The agent comprises a main agent and an accelerator, and a first cumulative treatment surface area (N1) corresponding to the main agent of the steel material (10) immersed in the treatment liquid and a second cumulative treatment surface area (N2) corresponding to the accelerator. ), And when each cumulative processing surface area (N1, N2) reaches a preset corresponding first or second threshold (M1, M2), the corresponding main agent or accelerator is replenished. The chemical | medical agent concentration adjustment method in the surface treatment apparatus of the steel material of Claim 1.   The method for adjusting a chemical concentration in a steel surface treatment apparatus according to claim 2, wherein the main agent is zinc phosphate and the accelerator is a nitrite group. A treatment liquid containing a chemical is stored in the treatment tank (14), and a chemical concentration adjusting device for a surface treatment apparatus that performs surface treatment by immersing a steel material (10) such as a steel piece or steel wire in the treatment liquid. Because
A calculation unit (30, 32) for calculating the cumulative treatment surface area (N1, N2) of the steel material (10) immersed in the treatment liquid;
A comparison unit (34, 36) that compares the cumulative processing surface area (N1, N2) calculated by the calculation unit (30, 32) with a preset threshold value (M1, M2);
A medicine supply device (16, 18) capable of supplying medicine into the treatment tank (14);
When the comparison result in the comparison unit (34, 36) indicates that the cumulative processing surface area (N1, N2) has reached a threshold (M1, M2), the medicine supply device (16, 18) is controlled to operate. And a chemical concentration adjusting device in the steel surface treatment apparatus, characterized by comprising control means (24) for replenishing the chemical into the treatment tank (14).   The said chemical | medical agent supply apparatus (16,18) is a chemical | medical agent concentration adjustment apparatus in the surface treatment apparatus of the steel material of Claim 4 comprised so that a chemical | medical agent may be replenished with a fixed supply rate. The treatment liquid includes a plurality of medicines, and each of the treatment parts includes a calculation unit (30, 32), a comparison unit (34, 36), and a medicine supply device (16, 18) corresponding to each medicine. 6. The chemical concentration adjusting device in the steel surface treatment apparatus according to claim 4, wherein the control means (24) controls each chemical supply device (16, 18) based on the comparison result in (36). .

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