JPS61288058A - Hot dipping apparatus - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus wherein a uniform hot-dipped layer is easily obtained by providing a wiping means to an outlet part of a hot-dipping vessel in which a solder material such as Al-Si series or Zn series is continuously hot-dipped on Al material. CONSTITUTION:A long-sized material made of Al or Al alloy e.g. an extruded multihole tube 6 for a heat exchanger is hot-dipped with a molted solder material 5 incorporated in a hot-dipping vessel 1 and drawn out in the arrow direction with a carrier 4 through a drawing-out hole of the side of the vessel 1. In this point of time, the great quantities of the melted solder material 5 are stuck on the surface of the tube 6 and in case of cooling, as it is, the great quantities of solder are collected in the lower part of the tube 6 and made to a sagging and it can not be used as a member for the heat exchanger. Therein a wiping die or a wiping jig 2 is provided and after passing the tube 6 through this wiping hole, the tube 6 is cooled with a cooling device 3. Thereby the hot-dipped uniform layer of the solder material having no sagging or the like can be easily formed on the tube 6.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides an A
The present invention relates to a hot-dip plating apparatus suitable for hot-dipping a brazing filler metal such as M-Si or Zn.

(Prior art) A-Si is applied to aluminum or aluminum alloy material.
The technique of applying a plating layer of a brazing material such as Zn-based or Zn-based brazing material is important in the manufacture of extruded multi-hole tube material for aluminum heat exchangers, which is assembled by brazing, for example.

That is, in recent years, there has been a strong desire to reduce the weight of heat exchanger cores from the standpoint of energy saving and cost reduction, and in order to meet this demand, thinning of the fins has been considered. However, if the thickness of the fin made of the plating sheet is made thinner than 0.16 mm, brazing at a temperature of around 610°C will result in
There was a problem in that the fins were prone to buckling. This occurs because during brazing, Si in the brazing material of the plating sheet sometimes diffuses into the core material, reducing the strength, and the absolute thickness of the core material becomes thinner, reducing the strength.

Therefore, by brazing the bare fins with an extruded multi-hole tube whose outer surface is melt-plated with brazing material, we were able to prevent buckling of the fins, achieve thinner walls, and reduce the weight of the heat exchanger core. It is desirable to reduce costs.

As a method for hot-dipping long aluminum materials such as extruded multi-hole tubes for aluminum heat exchangers with Al-Si or Zn-based brazing filler metals, hot-dip plating is performed by simply passing the aluminum material continuously through a plating bath. There is a way. However, with this method, "sagging" etc. tend to occur on the plated aluminum material, making it difficult to obtain a uniform plating layer.

On the other hand, in the hot-dip plating of other metal materials, in order to obtain a uniform plating layer, a method of blowing away excess brazing alloy with air or removing it with a roll is used.

(Problems to be Solved by the Invention) An example of forming a uniform plating layer using the above-mentioned conventional method is hot-dip solder plating on a flat tube that forms the flow path of a copper radiator for an automobile. In this case, the excess solder is blown away using air pressure. However, when this method is applied to hot-dip plating an Al-Si or Zn-based brazing alloy onto an aluminum material, the surface becomes extremely uneven, and the plated material cannot be used as a heat exchanger member. In addition, when hot dipping aluminum alloy onto a steel plate, it is common practice to pass it between rolls to obtain a uniform plating layer. If applied to plating materials, the aluminum tube will be deformed and cannot be used as a heat exchanger member.

(Means for Solving the Problems) The present invention has been made in view of the above circumstances, and is a method of continuously hot-dipping aluminum or aluminum alloy material with a brazing filler metal such as Al-3t type or Zn type. In doing so, the present invention provides a hot-dip plating apparatus characterized in that an ironing die or ironing jig is provided at the outlet of the plating layer.

(Example) Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of the outlet side of the horizontal hot-dip plating apparatus according to the present invention, and the symbol (A) indicates the hot-dip plating apparatus according to the present invention.
plating tank (1) in which a) is bored, and this plating tank (1)
), an ironing die (2) arranged near the draw-out hole (la), a cooling device (3) arranged after this ironing die (2), and a cooling device (3) arranged after this cooling device (3). and a carrier (4). A brazing material (5) made of AfL-Si, Zn, or the like is inserted into the plating tank (1). (6) is an extruded multi-hole tube made of aluminum or aluminum alloy to be plated, a partial perspective view of which is shown in Figure 2, in which (6a) are holes through which refrigerant passes when assembled as a heat exchanger. .

In FIG. 1, a plated multi-hole tube 6 is pulled out from a pull-out hole (la) by a carrier (4) in the direction of the arrow. At this point, a large amount of molten brazing material has adhered to the surface of the multi-hole tube, and if it continues to cool, a large amount of wax will accumulate at the bottom of the tube and cause "sagging".
Therefore, it cannot be used as a heat exchanger component, so the third
As shown in the figure, an ironing die 2 is provided which is divided into an upper member (2a) and a lower member (2b). At the start of plating, after the lump of wax (5) adhering to the extruded multi-hole tube passes through, the tube is separated into upper and lower parts for squeezing after normal plating is achieved. A vertically elongated ironing hole (7) is bored from the central surface to the back surface of the ironing die (2). This straining hole (7) has the same shape as the outer shape of the pressed multi-hole tube (6) in which a large number of holes (6a) are bored. In this case, if the clearance of the extruded multi-hole tube (6) to the ironing hole (7) is set as follows, a relatively uniform plating layer with little "sagging" can be obtained.

+0.15 C=T-0,05” C:riIJ7u7s(+am)
T: Thickness of bare tube + wm) The material of the ironing die (2) is preferably made of a refractory such as brick, a metal such as iron, copper, titanium, etc., various ceramics, graphite, etc.

Next, to explain the cooling device (3), as shown in Figure 4, it has a housing shape, and a coolant (8) is placed in the front part.
The supply ports (3a), (3a) are formed inside, and a large number of discharge ports (3b), (3b), . . . are formed inside. coolant 8
The coolant is blown out from the coolant outlet 3b and passes through the ironing die to rapidly cool the taming tube (6), rapidly solidifying the molten wax on the surface of the tube. For example, a blower (
(not shown) etc. may be used.

Since the hot-dip plating system M (A) is constructed as described above, in order to use it, first, as shown in Fig. 1, a multi-hole tube made of aluminum or aluminum alloy (
6) through the brazing filler metal (5) in the plating equipment tank (1) and through the draw-out hole (1a) provided on the side of the plating tank (1).
) is placed on the idle roller (9) and the carrier gripping part (
4a) and pulled out by the carrier (4), a large amount of the molten wax (5) adheres to the surface of the extruded multi-hole tube material (6) thus drawn out.
Next, this extruded multi-hole tube material (6) is ironed with a die (
2) After passing through the ironing holes (6) and removing excess brazing material (5), the extruded multi-hole tube material (6) is removed.
) is passed through the cooling device (3), and at this time, using appropriate means, the coolant (8) is blown out from the discharge ports (3b), (3b) provided inside the cooling device (3). As a result, the extruded multi-hole tube material (6) is rapidly cooled, and the molten brazing material (5) on its surface is solidified to a thickness of 2 to 50 mm.
A uniform plating layer of Lm can be obtained.

Further, as another example, a good effect can be obtained by using an ironing jig (10) as shown in FIG. 5 in place of the ironing die (2) used in the above embodiment. Like the ironing die (2), this ironing jig (10) is preferably made of refractory materials such as bricks, metals such as iron and titanium, various ceramics, graphite, etc. ) is the upper fist lower member (loa), (10b
) and left and right members (10c) and (10d), and the brazing filler metal (
It is possible to widen the ladder hole (11) until the mass of 5) passes through, and then set it to a predetermined size after passing through. Furthermore, even if the dimensions of the raw tube change somewhat, it can be immediately set to a clearance that can accommodate this change.

Furthermore, as shown in FIG. 6, after the cooling device (3), cooling fans (12), (12), and (12) are installed in succession to send air through the extruded multi-holes in the direction of the arrow. The cooling effect of the tube material 6 can be further enhanced.

In addition, in the above example, the extruded multi-hole tube for an aluminum heat exchanger is described in detail with hot-dip plating with a brazing material, but it is not necessarily limited to this, and any material made of aluminum or aluminum alloy may be used. It can be applied to anything.

Further, there is no particular restriction on the composition of the aluminum or aluminum alloy material and the brazing material to be hot-dipped thereon, but typical examples are as follows.

For aluminum or aluminum alloy, JIS
Pure aluminum such as 1050.1100, 3003.
Al-Mn alloy such as 3203, A such as 5052
l -M g-based alloy, 6063.6N01 etc.
Examples include Mg-Si alloys and A1-Zn-Mg alloys such as 7003.

Si 6 to 13 wt% as A-3T brazing filler metal,
Alloys consisting of the balance AfL and unavoidable impurities, such as JIS
404.3.4045.4047 etc., and
Alloys with 0.5 to 2% Mg added to these, such as JI
S 4003, 4004, 4005, etc., and in some cases Zn, Sn, In is added to the above alloy to improve corrosion resistance.
A brazing filler metal containing 0.10 to 25 wt% of one or more of the following may be used. This brazing filler metal is used for plating tubes made of pure aluminum or Al-Mn having a high melting point. Zn-based brazing material is 90-99% Zn and the balance is Au.
It is an alloy consisting of and unavoidable impurities. This brazing material is used for all aluminum and aluminum alloys.

(Effects of the Invention) As configured above, according to the hot-dip plating apparatus according to the present invention, a brazing material such as Al-St-based or Zn-based brazing material is applied uniformly to the extruded multi-hole tube made of aluminum or aluminum alloy, such as "sag". It is possible to easily form a plating layer free of cracks, and it is possible to obtain an aluminum heat exchanger member of stable quality.

Therefore, a high quality aluminum or aluminum alloy heat exchanger can be manufactured by assembling the aluminum heat exchanger members plated with the brazing metal thus obtained with brazing properties.

Furthermore, since this device has a simple structure, it is easy to manufacture and can be provided at low cost.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway view of the outlet side of the hot-dip plating equipment, Figure 2
The figures are a perspective view of an extruded multi-hole tube made of aluminum or aluminum alloy, Figure 3 is a perspective view of a laddering die, Figure 4 is a sectional view of a cooling device, Figure 5 is a perspective view of a laddering jig, and Figure 6 is a perspective view of a laddering die. FIG. 2 is a perspective view of a cooling device and a cooling fan.

Claims (1)

[Claims] Al-Si on aluminum or aluminum alloy material
A hot-dip plating apparatus is characterized in that an ironing die or ironing jig is disposed at the outlet of a plating tank for continuously hot-dipping a brazing filler metal such as Zn-based or Zn-based brazing filler metal.