JPS63235094A - Flux feeding method - Google Patents

Abstract

PURPOSE:To stabilize the flux rate of a flux cored wire and the product quality by having respective phase difference on plural screws so that the layer thickness of a flux dropped from a screw feeder may become constant. CONSTITUTION:In the case of a flux being dropped on a hoop by each No.1, No.2 and No.3 screw 5, the phase angle of each screw 5 is dislocated so that the crest and root of the flux layer thickness generated by the pulsing of each screw 5 may not be superposed. Each screw 5 is fitted at the pitch of about 50mm respectively and when the hoop speed is taken at about 50mm/min, the angle of the phase difference makes about 84 deg.. The crest and root of the flux layer are mutually adjusted by this phase differential angle to form a smooth flux layer. The flux cored wire of stabilized quality having less variance in the flux rate is thus manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for supplying flux to a hoop in a flux-cored wire manufacturing process.

[Prior Art] Conventionally, vibrating feeders have been widely used for supplying flux in the flux-cored wire manufacturing process due to reasons such as cost and ease of operation. However, when producing a mixed flux with different specific gravity, component segregation occurs in the mixed flux.

Specifically, FIG. 1 shows a case in which flux is continuously supplied to a hoop using a vibrating feeder, for example, in the manufacturing process of fuller wire for welding.

As shown in FIG. 1, the supply device i! Hoop 1 supplied from Roll 3 (not shown) is No. 1 of Roll 3.

1, No., and 2 are formed into a semicircular shape, and flux is supplied to the opening of the primary hoop 1 by a vibrating feeder 2.

After that, hoop 1 is set by roll 3 No. 3 to No. 016.
The opening is closed to form a welding wire, and then the wire is drawn to a predetermined size using a wire drawing machine (not shown).

In the process of producing the above-mentioned flux-cored wire, the flux components are mixed according to the welding application, so there are components with different specific gravities. Therefore, when the flux component is supplied by a vibrating feeder, the vibration of the feeder tends to separate the flux component with a light specific gravity from that with a heavy specific gravity, resulting in so-called component segregation.

Therefore, in order to prevent the above component segregation from occurring, it is necessary to reduce the vibration width of the vibrating feeder, or to adjust the thickness of the flux layer to match the mixed flux when supplying flux to the vibrating feeder. However, there is a problem that the efficiency of flux feeding work is low.

Furthermore, when the flux is fed by a vibrating feeder, as shown in Figure 2, the flux supply amount does not follow the vibration feeder, and when speeding up or decelerating, the flux rate (flux rate = flux weight / (hoop weight) +
Variations in the flux weight)X100 (%) occur, which deteriorates the quality of the product wire, such as deteriorating welding workability during welding.

Further, when changing the molding speed, the flux supply amount does not follow the vibration feeder, so it is difficult to adjust the flux supply amount.

In order to solve the above-mentioned problems, screw feeders have recently been used that do not cause component segregation and have the ability to follow the flux supply rate.

However, this screw feeder also has the problem of pulsation. That is, the pulsations that occur every time the screw rotates cause variations in the amount of flux supplied, resulting in variations in the flux rate.

[Problems to be Solved by the Invention] The present invention eliminates the effects of pulsation occurring in the screw feeder as described above, stabilizes the flux rate,
This was done to provide a flux-cored welding wire with stable product quality.

[Means for Solving the Problems] The present invention provides a screw feeder that continuously supplies flux, in which a plurality of screws are arranged, and the plurality of screws are arranged so that the layer thickness of the flux falling from the screw feeder becomes uniform. The gist lies in the fact that each of the screws has a phase difference.

[Function] In the present invention, it has been successfully eliminated that pulsation occurs in a single screw, and peaks and valleys occur in the thickness of the flux layer when the flux is fed to the hoop.

That is, in the present invention, by using a plurality of screws and providing each screw with a phase difference, the supply of flux to the hoop is stabilized.

In the present invention, it is preferable to increase the number of screws as much as possible, and according to the present invention, a good flux rate can be obtained even when the line is accelerated or decelerated.

Furthermore, in the present invention, the arrangement of the screw is not limited, and may be any position that will apparently eliminate pulsation, that is, make the layer thickness of the flux uniform at the falling point where the hoop receives the flux. .

In addition, in the present invention, when N screws are arranged along the hoop at the same height and the same pitch,
The phase shift angle for each screw is obtained by subtracting the angle determined by the pitch between the screws and the hoop speed from 360°/N.

[Example] Examples of the present invention will be described below. That is, flux was fed under the flux feeding conditions described later, and the flux rate was measured by the measuring method described later.

[Conditions] ・Hoop speed: 50 m/min (when filling flux) ・Hoop size: 15 mm width x 1 mm thickness - Flux supply amount: 1032 g/min (screw rotation 10100 rp ・Target flux rate = 15% ・Screw shape: (outer diameter 15 mmφ) ×Pitch 12m
m), 3 screws per screw [Method for measuring flux rate] After forming, use a wire drawing machine to make the hoop Red. At 50%, the wire was continuously cut to a length of 12.5 cm, and after measuring the total weight of the wire, the flux was It was removed, the weight of the hoop was measured, and the flux rate was calculated using the following formula.

X100 (%) Figure 4 shows the measurement results for the 7 flux rate. As shown in Figure 4, the variation rate was a small value of ±0.5% with respect to the target flux rate of 15%.

That is, as shown in FIG. 5, No. 1°, No. 2.
In the screws 5 of 3 wood labeled No. 3, the phase angle of each screw is adjusted so that when the flux falls onto the hoop 4, the peaks and valleys of the flux layer thickness generated by the pulsation of each screw do not overlap. shifted.

That is, in this example, each screw has a length of 50 m.
Since it is installed with m pitch, phase shift angle 0 = 84°
By (No, N002 for 1 screw)
Set the screw to 84°, and set the screw to No. 2 and N to the screw.
o, advance the phase of 3 screws by 84 degrees) Eliminate the overlap of the peaks and valleys of the flux thickness.

To be more specific, in this example, the number of screws 5 is 3, the pitch between the screws is 50 mm, and the speed of the hoop 4 is 50 mm/mm.
minute, and the screw rotation speed was 1100 rpm. Therefore, the time it takes for the hoop to reach the screw No. 1 from the screw No. 1 in FIG. 5 to the screw No. 2 as shown in FIG. 6 is 0.
06 seconds (50mm 150.000mm x 60 seconds =
0.06 seconds), this 0.06 seconds is converted into the rotational speed of the screw.

becomes.

That is, for example, when three wooden screws are arranged perpendicular to the hoop, and assuming that the falling time of the flux from each screw is the same, one rotation of each screw 360° is divided into 3 equal parts. 1200 divided
However, in this example,
The height is the same, but the pitch between each screw is 50m
m, so the phase shift angle of each screw is 1200-
It is necessary to set 36°=84°.

When carried out using the above method, as shown in FIG. 6, the valleys of the flux layer thickness formed by the first screw are added to the peaks of the flux layer thickness formed by the second screw, and the flux layer thickness formed by the first and second screws is further added to the peaks of the flux layer thickness formed by the second screw. The peaks of the flux layer thickness of the third screw can be overlapped with the valleys of the thickness. Therefore, in No. 2, a substantially smooth flux layer thickness can be obtained.

That is, according to the present invention, by using a large number of screws, pulsation, which is a problem with a single screw, can be apparently eliminated.

[Comparative Example] Similar to the example of the present invention, the following flux feeding pot was used:
Flux was fed and the flux rate was measured in the same manner as in the non-invented example.

[Flux feeding conditions] Hoop speed: 50 m/min (during flux filling) - Hoop size: 15 mm width x 1 mm thickness - Flux supply amount: 1032 g/min (screw rotation 10,100 rpm - Target flux rate: 15% - Screw shape: ( Outer diameter 22mmφX pitch 17m
m), Number of screws: 1 [Flux rate measurement method] According to the same measurement method as in the example. Under the flux feeding conditions, the screw shape is (outer diameter 22 mmφ x pitch 1
7 mm) was used.

That is, the above-mentioned screw can provide three times the amount of flux discharged at the same rotation speed as the screw used in the example (outer diameter φ15×pitch 12).

Fig. 3 shows the flax and waste ratios of the comparative example for the unreleased 11JJ example.

As shown in Figure 3, there is variation in the flux rate commensurate with the rotation of the spindle screw.

That is, with respect to the target flux rate of 15%, the variation was as large as ±1%.

[Effects of the Invention] As explained above, according to the present invention, it is possible to provide a method for reducing variations in flux supply amount in the flux-cored wire manufacturing process, and as a result, product quality with small variations in flux rate can be provided. Stable production of flux-cored wire is now possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a process of supplying flux to a hoop in the manufacturing process of a flux-cored wire for welding, and FIG. 2 is an explanatory diagram showing the amount of flux supplied by a vibrating feeder. FIG. 3 is an explanatory diagram showing the flux rate when the flux is supplied by the screw feeder of the comparative example, and FIG. 4 is an explanatory IJI diagram showing the flux rate when the flux is supplied by the example of the present invention. . Fifth
The figure is an explanatory diagram showing the flux supply from the screw to the hoop in the embodiment of the present invention, and FIG.
, 1. No, 2. It is an explanatory view showing the state of the flux layer due to No. 3 screws. 1. Hoop, 2. Vibration feeder, 3. e-roll, 4
...Two 7', 5-screw.

Claims (1)

[Claims] A screw feeder that continuously supplies flux is characterized in that a plurality of screws are arranged and each of the plurality of screws has a phase difference so that the layer thickness of the flux falling from the screw feeder is uniform. flux supply method.