JPS588760Y2 - Wire inoculation device of wire inoculation machine - Google Patents

Description

[Detailed explanation of the invention] This invention is based on molten cast iron contained in a pouring ladle, etc.
Ca to improve the properties of this molten metal.

This invention relates to improvements to wire inoculation machines that add metals such as Si and Mg.

In order to improve the mechanical properties of cast iron, Ca and S are added to cast iron.
In order to add metals such as i and Mg, the molten cast iron is placed in a ladle for pouring it into a mold, etc., as it has a property of being easy to separate from the molten metal, which has a low specific gravity and a high steam pressure. The metal contained in a thin-walled steel tube is added to the molten metal using a wire inoculation machine.

However, in conventional wire inoculation machines, the nozzle that discharges the wire into the ladle is fixed, so the S
Additives such as i, Mg, and Ca are added only to a very limited range within the treated molten metal.

Therefore, whether or not the additive is added uniformly into the molten metal depends solely on the natural diffusion of the additive within the molten metal.

Therefore, in the past, additives were not added uniformly within the molten metal, making it impossible to avoid non-uniform treatment effects.

This tendency is particularly noticeable when the calorie content of the additive is low, and it is difficult to uniformly add the additive into the molten metal unless the molten metal is mechanically stirred after the addition of the additive.

In view of the above, the object of this invention is to provide a wire inoculation device for a wire inoculation machine that can uniformly add inoculation wire to molten cast iron contained in a ladle or the like.

Next, this invention will be explained based on embodiments shown in the drawings.

First, we will explain the conventional wire inoculation machine 1.
Reference numeral 2 denotes a frame that is attached to the floor of a factory, etc., and a plate-shaped base plate 3 is attached to the upper part of this frame 2.

A wire feed motor 4 is attached to the top of this base plate 3.

Reference numerals 5 and 5' designate a pair of support frames attached to the upper surface of the front part (left side in the figure) of the base plate 3.

Reference numeral 6 denotes a drive roller, which is mounted on a shaft 7 that is rotatably supported by the support frames 5 and 5', and the other end (not shown) of the shaft 7 is connected to the wire feeding roller It is rotated by a motor 4.

A presser roller 8 is attached to a shaft 9 rotatably supported by support frames 5 and 5' above the drive roller 6, and acts to press the inoculation wire W against the drive roller 6.

10 is a discharge nozzle attached to the front part of the support frames 5, 5'.

Reference numeral 11 denotes a wire guide mounted on the base plate 3 behind the support frames 5, 5', and the inoculation wire W is inserted through the center hole 11a of the cylindrical portion.

Reference numeral 12 denotes a drum support member, which is attached to the rear part of the frame 2 and to the lower blade of the base plate 3, and is attached to the inoculating wire W.
A wire drum 13 wound with is rotatably supported by a shaft 14.

The inoculating wire W is made of Si in a thin steel pipe.

Powders such as Mg and Ca are mixed and packed in a predetermined ratio.

In this embodiment, a motor mount 15 is provided below the discharge nozzle 10 of the conventional wire inoculation machine 1, and a motor 16 is mounted on the inclined surface of the front part of the motor mount 15.

17 is a bending arm attached to the motor 16;
This bending arm 17 is configured to be rotated back and forth by a motor 16.

A tubular swinging nozzle 18 is attached to the tip of the bending arm 17.

This swinging nozzle 18 is attached to the bending arm 17 with its tip facing downward, and when the motor 16 is operated, the swinging nozzle 18 reciprocates.

FIG. 2 shows the main parts of a wire inoculation machine according to another embodiment.

In this wire inoculation machine, a swing nozzle 20 is attached to a bracket 19 attached to support frames 5, 5' so that one end thereof can swing.

21 is an arm attached to the shaft of the motor 16;
It is connected via a pin 22 to a lever 23 attached to the rotating nozzle 20.

When the motor 16 is activated, the rotating nozzle 23 is rotated in a conical shape around the end attached to the bracket 19 via the arm 21 and the lever 23, and is inserted into the rotating nozzle 23. inoculated wire W
gives a rotational motion to.

Next, the operation of the first embodiment will be explained.

The inoculation wire W wound around the wire drum 13 has its end connected to the small hole 3a of the base plate 3 and the center hole 1 of the wire guide 11.
After passing through 1aK, it passes between the drive roller 6 and the press roller 8, passes through the discharge nozzle 10, and is inserted into the swing nozzle 18.

- force, in the ladle placed on the lower blade of the swinging nozzle 18,
There is a molten metal M such as cast iron that is inoculated with wire.

When the wire feed motor 4 and the motor 16 are operated simultaneously in the above state, the inoculating wire W is sent out from the discharge nozzle 10 at a constant speed by the drive roller 6 and the presser roller 8, and passes through the swinging nozzle 18 into the molten metal. I can be pushed into it.

On the other hand, since the swinging nozzle 18 reciprocates within a predetermined range, the additive is inoculated over a wide range above the molten metal M.

Here, if the inoculating wire W is sent at a moderate speed by the wire feeding motor 4, the inoculating wire W can have sufficient rigidity even though it is only for a short time while it melts in the molten metal M. The inoculation wire W reciprocating within M mechanically stirs the molten metal M and uniformly adds the additive over the entire area of the molten metal.

When a predetermined amount of additive is added, both motors 4 and 16 are stopped.

Next, Table 1 shows an example in which the uniformity of the addition effect was compared between the conventional wire inoculation machine and the wire inoculation machine of this example.

The additives here are Ca and Si, the inoculant filling rate (the weight ratio of the additive to the outer tube) is 20%, and the inoculum to molten metal inoculation addition rate (when the inoculant is added to the molten metal, the inoculant to the molten metal is 20%). weight ratio) was 0.035%.

Here, ASTM-2C plate chill is an American standard for testing molten metal properties.

X is the average value of the measured chill depth, 5 per treatment.
This is the data obtained by sampling.

Further, σ is the deviation value of the chill depth and is expressed as (x−Xn)2.

-1 In this equation, n is the number of samplings, and Xn is the chill depth of each sampling.

As mentioned above, when comparing the wire addition effect by the wire inoculation machine of this example with the wire addition effect by the conventional wire inoculation machine, the deviation value σ is about 1/2, and the example is better. It can be seen that the molten metal properties have been improved and the molten metal has become more homogeneous.

In the second embodiment, the inoculating wire W is given a turning motion, and the same effects as in the first embodiment can be obtained.

As mentioned above, this invention differs from the conventional wire inoculation machine by rotating the wire discharged from the wire discharge nozzle.
By providing a mechanism for reciprocating rotation, etc., when inoculating molten cast iron in a ladle etc. with a wire, additives are inoculated over a wide range of the molten metal, and the molten metal is also stirred. , it is possible to uniformly inoculate the molten metal with additives, and the mechanical properties of the cast iron in the ladle can be made more homogeneous than before.

[Brief explanation of drawings]

The figures show an embodiment of this invention; FIG. 1 is a perspective view of a wire inoculation machine equipped with a swinging nozzle, and FIG. 2 is a perspective view of a main part of a wire inoculation machine equipped with a rotating nozzle. DESCRIPTION OF SYMBOLS 1...Wire inoculation machine, 10...Discharge nozzle, 16...Motor, 17...Bending arm, 18...Swinging nozzle, 20...
...Swivel nozzle, L...Ladle, M...
Molten metal, W...Inoculation wire.

Claims (1)

[Scope of utility model registration request] In a wire inoculation machine that inoculates molten cast iron contained in a ladle or the like through a discharge nozzle that discharges a wire made of a steel tube coated with a calorific agent, the wire discharged from the discharge nozzle is inoculated into the molten metal. A wire inoculation device characterized by having a mechanism for pivoting or rotating by pressing a button inside.