JPH08206878A - Production of fused flux for welding and apparatus therefor - Google Patents

Abstract

PURPOSE: To provide a process for producing a fused flux for welding capable of producing a fused flux having from a low bulk density to a high bulk density at a uniform shape and bulk density with the same apparatus and an apparatus therefor. CONSTITUTION: This process for producing the fused flux for welding and the apparatus therefor comprise cooling and pulverizing the fused flux 8 charged at the front of the injection hole of an injector disposed at one end of a cylindrical trough 1 by jet water 6 injected from this injection hole and discharging the pulverized flux from the trough. The fused flux is cooled and pulverized by adjusting the pressure of the jet water 6 and the temp. of transporting water 16 according to the desired shape and the bulk density.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a molten flux for welding, and more particularly to a technique for producing a molten flux for welding having a desired shape and bulk density.

[0002]

2. Description of the Related Art A method called a jet water granulation method is one of the methods for producing a granular flux by cooling and crushing a molten flux, and an apparatus to which this method is applied is shown in FIGS. Show. FIG. 4 is a schematic view showing a conventional water granulator, and FIG. 5 is a sectional view taken along the line bb 'of FIG.

In these figures, 2 is a jet water injection device provided at one end of the trough 1, 10 is a discharge port at the other end of the trough 5, 5 is a pressure water supply pipe, and 4 is a nozzle box 3.
Slit type injection hole provided on the front side of the, 7 is a water flow adjusting plate, 6
Is jet water that is guided out from the water flow adjusting plate. Reference numeral 8 is a molten flux (hereinafter referred to as molten metal). Reference numeral 9 is a charging port for charging molten metal, and 11 is a mixture of discharged water and granular flux.

In this apparatus, when the molten metal 8 melted in an electric furnace or the like is thrown directly from the electric furnace, once received in a ladle, or through a tundish, in front of the injection hole 4 of the injection device 2 in the trough 1, the injection is performed. The molten metal 8 collides with the jet water 6 from the injection hole 4 installed horizontally or inclined, is cooled and crushed, and is discharged from the discharge port 10 together with water in the trough 1. In such a conventional water granulator, for example, pressure water having a water pressure of 2 to 5 kg / m ² is used, and a bulky density of 0.8 to 2.0 g / cm ³ and relatively heavy pumiceous and glassy fluxes are generated. Manufactured.

However, in the conventional manufacturing method using the water granulator, since the jet water jet port is a slit type hole,
The jet water discharged from the jet outlet does not have a constant water flow in the left-right direction and does not hit the entire melt with a uniform water pressure, resulting in a difference in shape and non-uniform bulk density.

The temperature of the molten metal charged into the trough 1 through the inlet 9 from an electric furnace has an initial temperature of 1500 ° C. to 1600 ° C.
C, the temperature at the end of the period becomes as low as 1300 ° C to 1500 ° C.
The granulated flux has a low bulk density at a high temperature and a high bulk density at a low temperature, so that the granulated flux discharged from the discharge port 10 of the trough 1 has a non-uniform bulk density.

Further, if the water pressure is lowered to increase the size of the flux particles, a high temperature flux may be accumulated in the trough to induce a steam explosion, and it is difficult to increase the size of the flux particles.

Therefore, each time a molten flux having a different target shape and bulk density is produced, for example, in the case of a needle-like flux (a glass-like flux with many needle-like fluxes and a relatively low bulk density), the jet Water granulation method, in the case of pumice-like flux, a method of charging molten flux while releasing pressurized water to the surface of the water tank described in JP-A-56-84348, and in the case of glassy flux, stirring water in the water tank. However, it was necessary to change the cooling and pulverizing method to a method of introducing molten flux.

[0009]

In view of the current state of the art, the present invention has a bulk density of 0.4 to 2.0 g / cm ^3.
From low bulk density to high bulk density, in addition to needle-shaped, glass-shaped, and pumice-shaped flux, melt type flux with different shape is manufactured with the same equipment, with less variation in shape and bulk density. Apparatus and method.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is that a molten flux injected in front of an injection hole of an injection device provided at one end of a cylindrical trough is jet water injected from the injection hole. In a method for producing a molten flux for welding, which is cooled and pulverized and discharged from a trough, the welding is characterized by cooling and pulverizing by adjusting the pressure of jet water and the temperature of carrier water according to the desired shape and bulk density. Welding method for producing a flux, in which molten-type flux injected in front of an injection hole of an injection device provided at one end of a cylindrical trough is cooled and pulverized by jet water injected from the injection hole and discharged from the trough In a manufacturing apparatus for molten flux for jet, a water pressure adjusting device is provided with a jet water injection device connected to the water pressure adjusting device, and the jet water injection hole has a horizontal hole in a horizontal direction. A welding flux manufacturing apparatus characterized in that a plurality of rows are provided at intervals in the vertical and horizontal directions, and a semicircular carrier water port connected to a temperature control device is provided below the injection hole. is there.

[0011]

First, the flux producing apparatus of the present invention will be described with reference to the drawings. 1 is a side view showing the main part of the device of the present invention, FIG. 2 is a sectional view taken along the line aa 'in FIG. 1, and FIG. 3 is a diagram showing an outline of the device of the present invention.

The main part of the flux producing apparatus shown in FIG. 1 comprises a cylindrical trough 1 and a jet water jetting device 2 provided at one end of the trough 1. The jet water jetting device 2 is provided above a nozzle plate 13. It is composed of an injection hole 14, a water flow adjusting plate 7 extending forward from the lower side of the injection hole 14, and a carrier water port 15 provided below the water flow adjusting plate 7. The injection holes 14 are horizontally circular holes and are provided in a plurality of rows at intervals vertically and horizontally. Below the injection holes 14, a temperature control device (not shown) is connected to form a semicircular conveyance. The water port 15 is opened.

Molten metal 8 is poured from a melting furnace 12 through a charging port 9, collides with jet water 6 sprayed from a spray hole 14 in an upper portion of a nozzle plate 13 of a spraying device 2, and is cooled and crushed. The crushed flux is carried in the trough 1 by the water port 15
Drain port 1 at the tip of trough 1 together with carrier water 16 sent from
It is discharged as a granulated flux 11 from 0, and is sent to the next step from the receiving tank 21 via the conveyor 22. Reference numeral 17 in the figure is a pressure device for pressurizing the supply water. 18 is a water quantity device,
Reference numeral 19 is a water temperature measuring device, and 20 is a carrier water pipe.

According to the flux manufacturing method and apparatus of the present invention, since the jet water pressure adjusting device 2 is provided,
It is possible to manufacture flux of various shapes by adjusting the pressure of jet water. Since the jet water injection holes 14 are circular holes and are provided in a plurality of rows separated vertically and horizontally, the jet water flow is constant both vertically and horizontally, and the jet water is uniformly applied to the entire molten metal 8 that has been injected, and the same shape and a uniform bulk density. It is possible to manufacture a different flux 11.

Since the carrier water port 15 is provided below the jet water injection hole 14, the flux 11 in the trough 1 is not discharged to the discharge port 10 and accumulated in the trough, so that there is no danger of steam explosion. Further, the temperature of the carrier water can be adjusted, and by adjusting the temperature of the carrier water according to the hot water discharge temperature, a flux having the same shape and a uniform bulk density can be produced. A more uniform flux can be obtained by adjusting the flow rate of the carrier water according to the target flux shape and bulk density.

The welding flux producing apparatus of the present invention has a trough diameter of 300 to 800 mm, a round hole diameter of 5 to 12 mm, and an interval of 20 to 40 mm in which the vertical and horizontal directions are aligned, and the number of round hole rows is 4 to 8.
Rows, the number of round holes is 40 to 70, the semicircular carrier water port is 50 to 200 mm from the trough bottom, and the jet water pressure is 0.5 to
It is preferable that the temperature range of the carrier water is 8 kg / cm ² , and the temperature range of the carrier water is from room temperature to 90 ° C.

Next, an example of controlling the flux shape and bulk density by the method and apparatus of the present invention will be described.
When the needle-like flux has a bulk density of 1.1 to 1.7 g / cm ³ , the jet water pressure is increased. When the glassy flux has a bulk density of 1.3 to 2.0 g / cm ³ , the jet water pressure is lowered. Increase the amount of water to be carried and lower the water temperature. In the case of pumice-like flux with a very low bulk density of 0.4 to 0.8 g / cm ³ , the jet water pressure is low and the temperature of the carrier water is increased as the tapping temperature decreases. Similarly, in the case of pumice-like flux with a bulk density of 0.8 to 1.3 g / cm ³ , the pressure of jet water is set to medium pressure, and the temperature of the carrier water and the water temperature are increased as the tapping temperature decreases.

[0018]

The present invention will be described in more detail with reference to the following examples. First, various fluxes having the target composition, shape and target bulk density shown in Table 1 are mixed with various raw materials and melted in an electric furnace, and 3000 kg of each is prepared by the apparatus shown in FIGS. 1 and 4 so that the target shape and bulk density are obtained. I made a prototype. Table 2 shows the results.

The apparatus shown in FIG. 1 used in the embodiment is a semicircle with a trough diameter of 400 mm, a round hole diameter of 8 mm, a gap of 30 mm between the upper, lower, left and right of the round holes, 6 rows of round holes, and 50 round holes. The shape of the water transfer port is 90 mm from the bottom of the trough, and the apparatus of FIG. 4 has a trough diameter of 400 mm, a slit type injection hole width of 10 mm and three rows of slits.

[0020]

[Table 1]

[0021]

[Table 2]

In Table 2, No. Nos. 1 to 4 are production examples of the molten flux according to the present invention, No. 5 to 8 are comparative examples. No. according to the present invention. In Nos. 1 to 4, the jet water pressure and the carrier water temperature are adjusted according to the target shape of the flux, the bulk density and the hot water temperature, so that the flux having the target shape and the uniform bulk density is obtained, respectively. It was a satisfactory result.

No. in Comparative Example No. 5 uses the apparatus of the present invention, but No. 5 is used. No. 8 is a conventional device and there is no carrier water,
Flux was accumulated in the trough and there was a danger of steam explosion, so it was discontinued. No. 6 and No. In No. 7, the target shape was obtained, but since the jet water jet was a slit type jet hole, the jet water flow was not constant, and there was no carrier water whose water temperature was adjusted, so the bulk density became non-uniform. It was

[0024]

As described above in detail, according to the method and apparatus for manufacturing a molten flux for welding of the present invention, the molten flux having a low bulk density to a high bulk density can be formed in the same shape and bulk density. Since it can be manufactured uniformly, it greatly contributes to the productivity and quality improvement of the molten flux for welding.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part of a melting type flux device for welding according to the present invention.

FIG. 2 is a sectional view taken along the line aa ′ of FIG.

FIG. 3 shows a schematic view of an example of a melting type flux device for welding of the present invention.

FIG. 4 shows a main view of a conventional fusion type flux device for welding.

5 is a cross-sectional view taken along the line bb 'of FIG.

[Explanation of symbols]

 1 Trough 2 Jet Water Injector 3 Nozzle Box 4 Slit Type Injector 5 Pressure Water Supply Pipe 6 Jet Water 7 Water Flow Adjustment Plate 8 Melt Flux 9 Molten Flux Inlet 10 Discharge Port 11 Water Flux 12 Melt Furnace 13 Nozzle Plate 14 Injection hole 15 Conveying water port 16 Conveying water 17 Pressure device 18 Water amount device 19 Water temperature measuring device 20 Conveying water pipe 21 Receiving tank 22 Conveyor

Claims (2)

[Claims] 1. A fusion type flux for welding, wherein a fusion type flux injected in front of an injection hole of an injection device provided at one end of a cylindrical trough is cooled and pulverized by jet water injected from the injection hole and discharged from the trough. 2. The method for producing a molten flux for welding, which comprises cooling and pulverizing by adjusting the pressure of jet water and the temperature of carrier water according to a desired shape and bulk density. 2. A molten flux for welding, which melts and melts a molten flux that has been injected in front of an injection hole of an injection device provided at one end of a cylindrical trough by cooling and pulverizing with jet water injected from the injection hole and discharging from the trough. In the manufacturing apparatus of, the jet water injection device connected to the water pressure adjusting device is provided,
The jet water jet holes of the jetting device are horizontally arranged in a plurality of rows in the form of round holes at intervals in the vertical and horizontal directions, and a semicircular carrier water port connected to the temperature control device is provided below the jet holes. An apparatus for producing a molten flux for welding, which is characterized by being provided.