JPH01275773A - Method for adjusting plating amount in continuous plating on metallic sheet - Google Patents

Abstract

PURPOSE:To easily adjust a plating amt. in a short time by changing the feed rate and contact supply angle of a plating metal at the time of bringing the plating metal into contact with a moving heated metallic sheet to deposit a plating film. CONSTITUTION:A band steel 10 is heated in a heating furnace to a temp. higher than the m.p. of zinc, and continuously traveled in direction of the arrow. A zinc plating material 20 is drawn out by pinch rolls 30-33, preheated by a heater 40, and brought into contact with the band steel 10 to deposit a zinc plating film 21 on the band steel surface. The film 21 is then uniformized by a surface regulator 50. Under such a constitution, oil hydraulic cylinders 60-63 and 70-73 are actuated, as required, to incline the vertically supplied plating material 20, hence the contact supply angle at the contact point is changed, and the feed rate of the plating material 20 is changed. By this method, the plating amt. on the band steel 10 is easily adjusted in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for adjusting the amount of plating applied when continuously plating the surface of a metal plate.

[Conventional technology]

Conventionally, the hot-dip plating method, which has been widely used as a method for forming a plating film on the surface of copper strips, has many problems in terms of the quality and type of plating, and efforts have been made to solve these problems. Although many improvement plans have been proposed and implemented, none of them has reached a fundamental solution in terms of workability, productivity, safety, cost, etc.

Therefore, the present inventors have proposed a new continuous plating method that is completely different from the conventional hot-dip plating method. FIG. 5 schematically shows the principle of this plating method, in which a moving metal plate (100) is plated with a metal material (20
0), and form a molten layer (201) of plating metal at the contact point, and continuously supplying the plating metal material (200) to the metal plate (100). The metal is continuously deposited as a plating film (202) on the surface of a moving metal plate (100).

[Problem that the invention seeks to solve]

On the other hand, with the diversification of performance of various products, high-mix low-volume production is being carried out, and as a link to this, the plating applied to these products is also required to have different performance, thickness, etc. many. For example, in the case of automobile exterior panels, there may be differences in the required plating thickness depending on the area of use, such as the body part and the area around the legs. However, if we try to manufacture products with different plating thicknesses on one line using the above method, new problems will arise that are difficult to solve.

Thickness H of the plating film (202) formed by the above method
is the moving speed of the metal plate (Zoo), U is the moving speed of the metal plate (Zoo), and the plated metal material (
200), and when the thickness of the plated metal material (200) in the direction of movement of the metal plate is W, it is given by: (1) H=W (ten).

Among these, when the moving speed U of the metal plate (100) and the thickness W of the plated metal material (20) are approximately constant, the plated film (
The thickness H of the plated metal material (202) is proportional to the supply speed V of the plated metal material (200), but this supply speed V also changes depending on the dissolution rate of the plated metal material (200). However, the molten layer of plating metal (
201) is formed by attaching a metal plate (100) and a metal material (
After preheating the metal plate (100) at the contact point
Since the plated metal material (200) is melted by sensible heat, the melting rate of the plated metal material (200) is affected by the sensible heat of the metal plate (1oo) and the preheating ability of the plated metal material (200). As a result, the supply rate V depends on the preheating ability of the metal plate (1oo) and the mated metal material (200).

If you try to change the plating thickness during line operation according to the above request, it will be necessary to adjust the preheating temperature of the metal plate (100) and the plated metal material (200) in accordance with the target plating amount. However, in the case of cooling, it is normal to let it cool, and a very high cooling response cannot be expected.Therefore, when changing the coating amount (especially when decreasing the coating amount), the target plating coating amount can be instantly changed. There was a problem in that there were parts (unsteady parts) that could not be changed.

The present invention was devised in view of the above-mentioned problems, and proposes a new method that can easily and quickly adjust the amount of plating deposited, thereby maximizing the merits of the continuous plating method described above. This will enable them to demonstrate their abilities to the fullest.

[Means for solving problems]

Therefore, in the present invention, the amount of plating deposited on the surface of a metal plate is adjusted by changing the feed rate of the plated metal material and the contact supply angle of the plated metal material.

The configuration of the present invention will be explained in detail below.

As shown in FIG. 1, a plating metal material (2) is supplied from a direction perpendicular to a metal plate (1) flowing at a constant speed in the direction of the arrow. In this case, as described above, the metal plate (1) or the metal plate (1) and the plated metal material (2) are heated in advance to form a molten layer of plated metal at the contact point.

On the other hand, as shown by the imaginary line, the plated metal material (
2) When you tilt it and change the contact supply angle, the metal plate (
1] will change (increase).

At that time, the feed speed of the plated metal material (21) was changed from V to v2.
The speed is adjusted so that the feed speed component v2 of the feed speed v2 in the direction perpendicular to the metal plate is equal to vl.

Then, the adhesion amount, which was initially QtT shown by the diagonal line, changes to Q2 shown by the horizontal two-dot chain line. in this way,
When the feed rate component in the direction perpendicular to the metal plate is kept constant, the contact feeding angle of the plated metal material (2) is changed to feed the metal plate (1).
By adjusting the contact area with the metal, the amount of plating deposited can be easily changed. Of course, changing the feed rate of the plated metal material (2) involves adjusting the heating capacity of the metal plate (1) and the plated metal material (2), but this is done by always keeping the contact feeding angle constant and feeding the plated metal material. Compared to the case (2) in which the feed rate is adjusted, the range of adjustment is smaller because of the change in the contact area. In addition, in the present invention, since both the feed rate and the supply angle of the plated metal material (2) are changed, the range of coating amount control and its controllability are far superior to the conventional case where only feed rate control is carried out. Of course it is.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 2 shows the equipment for adjusting the adhesion amount of continuous single-sided galvanizing according to the method of the present invention.

The copper strip a1 flows continuously in the direction of the arrow while being heated to a temperature higher than the melting point of zinc in a heating furnace (not shown), whereas the galvanized material (a) is heated by a heating furnace (not shown) to a temperature above the melting point of zinc. (33), and is brought into contact with the steel strip Ql while being preheated by a heating device (40) having an infrared heater or an induction heating device. Through this contact, the galvanized material (■) is heated above the melting point of zinc by the sensible heat of the copper strip (IG), and a molten zinc layer is formed there.Therefore, a galvanized film Qυ adheres to the surface of the copper strip. By applying ultrasonic vibration to the galvanized film using a surface conditioning device (50) having ultrasonic vibrators (51) to (53), the coating is made uniform and the surface is conditioned.

In this embodiment, there are pivot points A on both sides of the heating device (40), and the pivot points A are supported by bearings (not shown).
The structure is such that it can be tilted in the direction of the steel strip←Q line, and four points on the frame of this heating device (40) are connected to hydraulic cylinders (6
0) to (63) cylinder rods (60a) to (6
3a), the heating device (40) is activated by the operation of these cylinders (60) to (63).
) is a trap so that the slope can be adjusted to any desired angle around point A.

In addition, the pinch rolls (30X31) and (32X33) also have chocks (34) and (35) that support their respective pivots attached to the cylinder rods (2) of the respective hydraulic cylinders (70) to (73).
) to (73a). These hydraulic cylinders (70) to (73) are connected to a heating device (4).
It operates in conjunction with the tilting of the cylinder rod (70 m
) to (73a) can be expanded and contracted to move in the horizontal direction.

Therefore, the hydraulic cylinders (60) to (63) and (70)
(73) ft By operating as necessary, the galvanized material (2) that was being supplied vertically is supplied at an angle, and the contact supply angle at the contact point can be changed.

The direction of inclination at this time is preferably 4CL round so that the line direction side is at an acute angle as shown in the drawing. If the galvanized material (1) is tilted so that the line direction side is at an obtuse angle, the sharp tip of the galvanized material will be scraped off by the heat and vibration of the copper band (lG), as shown in Figure 3. This is because the metal is removed and causes uneven coating amount.

Furthermore, at the same time as the above-mentioned tilting, the feeding speed of the galvanized material (to) is increased by increasing the heating amount of the heating device (40) and also increasing the feeding amount of the pinch rolls (30) to (33). There is a need.

On the other hand, if you want to feed something that has been fed at an angle with a reduced angle, adjust the inclination and heating capacity of the heating device (40) so that the above operations are reversed. Since the movement of the pinch rolls (3o) to (33) and the adjustment of the feed amount must be performed in conjunction with each other and under constant control, in this embodiment, these operations are controlled by a control circuit (not shown). ) is under a lot of control.

While controlling the vertical feed rate of the galvanized material (1) to be constant using the above-mentioned device, the relationship between the contact feeding angle of the galvanized material (1) and the amount of plating deposited was investigated. The results shown in the figure were obtained. In this graph, the contact supply angle in the straight direction to the copper strip (1) is O, and the amount of plating at this time is 1, but in this case, the amount of plating is the minimum, and the line It can be seen that as the direction is tilted, the contact area of the galvanized material (2) to the copper strip a1 increases, and the amount of plating deposited gradually increases.

〔Effect of the invention〕

As described in detail above, according to the method for adjusting the amount of plating of the present invention, the method is not limited to controlling the heating temperature of the metal plate or the plated metal material, but also provides contact supply where the plated metal material contacts and melts the metal plate. By adjusting the angle and controlling the feed rate of the plated metal material, it has the excellent effect that the amount of plating deposit can be adjusted easily and in a short time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram explaining the present invention in detail, FIG. 2 is a perspective view showing an example of equipment for implementing the method of the present invention,
Fig. 3 is an explanatory diagram showing an inappropriate tilting state of galvanized material in this equipment, Fig. 4 is a graph showing the relationship between contact supply angle and plating amount of galvanized material obtained by this equipment, FIG. 5 is an explanatory diagram schematically showing the principle of the continuous plating method proposed by the present inventors. In the figure, (1) (100) is a metal plate, +21 (200) is a plated metal material, (II is a copper band, the trowel is a galvanized material, +
211 is galvanized film, (30X31X32X33)
is a pinch roll, (40) is a heating device, (50) is a surface conditioning device, (6QX61X62X63X70X71X7
2X73) is a hydraulic cylinder, (201) is a molten layer, (2
02) Each of the plating films is shown. Figure 1 Figure 5 Figure 3 Figure 4 Contact supply angle

Claims (1)

[Claims] A plating metal material is brought into contact with a moving metal plate, a molten layer of the plating metal is formed at the contact point, and the plating metal material is continuously supplied to the metal plate. In a continuous plating method for a metal plate in which the molten plating metal is continuously deposited as a plating film on the surface of a moving metal plate, the feed rate of the plating metal material and the contact feeding angle of the plating metal material A method for adjusting the amount of plating in continuous plating of metal plates, the method comprising adjusting the amount of plating by changing the amount of plating.