JPS621209Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a rotating body for centrifugal spraying. There are various methods for producing powder, but
One of them is the centrifugal spray method. This centrifugal atomization method applies centrifugal force to the molten metal flow to disperse and atomize the molten metal to obtain powder, and generally requires relatively simple equipment, resulting in low equipment costs. This has the advantage that the energy required for scattering and atomizing the molten metal stream is small, and powder with little contamination can be obtained. There are various types of devices for carrying out this centrifugal spraying method, but usually, a flow of molten metal is supplied to a receiving section of a rotating body rotating at high speed, and the above-mentioned metal is initially placed on the receiving section. Skull made of solidified molten metal flow
After the scalp is formed, a molten metal flow is successively supplied onto the skull, and the molten metal flow is dispersed and atomized by centrifugal force to obtain powder. In this case, the rotating body is rotating at high speed, so
If there is some imbalance in the skulls formed in the hot water receiving section, the skulls will separate from the rotating body and scatter in chunks, which may not only cause accidents such as damage to the equipment, but also cause the skulls to become detached. Later, a new flow of molten metal will cause a skull to be formed on the receiving part of the rotating body, resulting in problems such as a decrease in the amount of powder produced relative to the amount of molten metal supplied, resulting in a decrease in powder yield. Was. This idea was made in order to eliminate the above-mentioned conventional drawbacks, and it is a rotating body for centrifugal spraying that can prevent the skull formed by solidification of the molten metal flow on the receiving part of the rotating body from detaching. is intended to provide. That is, this invention provides a centrifugal spraying device that produces powder by supplying a molten metal flow to a molten metal receiving portion of a rotary body and applying centrifugal force to the molten metal flow to disperse and atomize the molten metal flow. The present invention is characterized in that a concave skull locking portion is provided that can prevent the skull of the molten metal solidified on the metal receiving portion from coming off when the rotating body is rotated. Hereinafter, embodiments of this invention will be described in more detail based on the drawings. FIG. 1 is a diagram showing a first embodiment of this invention, and particularly shows the rotating body portion of the centrifugal spray device. The rotating body 1 includes a receiving section 3 having a receiving surface 3a for receiving a molten metal flow 2 supplied from a crucible or tundish (not shown), and the receiving section 3.
The hot water receiving portion 3 and the heat insulating material 4 are connected to the hot water receiving portion 3 and the heat insulating material 4 through the hot water receiving portion fixing member 5. The holding member 6 is fixed to a rotating shaft 7 connected to a motor (not shown), so that the entire rotating body 1 can rotate at high speed. . Furthermore, a recessed skull locking portion 3b is provided approximately at the center of the hot water receiving portion 3. Next, the situation of producing powder from the molten metal flow 2 will be described. First, the rotating body 1 is rotated at high speed (for example, 10,000 to 15,000 rpm) by an electric motor, an air motor, etc. (not shown). Next, the molten metal flow 2 is supplied onto the molten metal receiving portion 3 of the rotating body 1 from a crucible or tundish (not shown) or the like. At this time, in the initial period when the molten metal flow 2 is supplied onto the receiving part 3, the molten metal solidifies in the skull locking part 3b formed in the receiving part 3 and on the receiving surface 3a. 9 is formed. Subsequently, molten metal flow 2
When supplied, the molten metal stream 2 spreads on the skull 9 due to centrifugal force without solidifying, and then leaves the skull 9 and becomes atomized into powder 10. The thickness of the skull 9 at this time is determined by the temperature and thermal conductivity of the molten metal receiving part 3 and the temperature and flow rate of the molten metal flow 2, but it is all the same on the circular molten metal receiving surface 3a. However, sometimes there is a downward balance in the thickness of the skull 9. However, since a portion of the skull 9 is solidified within the concave skull locking portion 3b, even if the imbalance occurs, the skull 9 will not be scattered in chunks. FIG. 2 is a diagram showing a second embodiment of this invention, and particularly shows the rotating body portion of the centrifugal spray device. The rotating body 11 has a receiving surface 13a for receiving the molten metal flow 2, and a receiving portion 13 having a concave skull locking portion 13b formed of a through hole approximately at the center.
, a support plate 14 with good thermal conductivity disposed on the bottom side of the hot water receiving section 13 , a hot water receiving section fixing member 15 disposed around the hot water receiving section 13 , and this hot water receiving section fixing member 15 It is mainly composed of a holding member 16 that fixes and holds the hot water receiving part 13 and the support plate 14 via the holding member 16, and has a structure in which a water cooling space 18 is formed at the bottom of the support plate of the holding member 16. Furthermore, the rotating body 11
The holding member 16 is fixed to the rotating shaft 17 via a sealing O-ring 19, so that the entire rotating body 11 can rotate at high speed. Further, the rotating shaft 17 has a double tube structure, and an inner tube 17a
The cooling water 20 supplied from the above is put into the water cooling space 18,
The cooling water 20 in the water cooling space 18 is discharged from between the inner tube 17a and the outer tube 17b, and the skull 9 can be cooled through the support plate 14. Next, to explain the operation when using the rotating body 11, first, the rotating body 11 is rotated at high speed by a motor (not shown), and then the molten metal flow 2 is supplied onto the molten metal receiving portion 13 of the rotating body 11. do. Here, the molten metal flow 2 is a concave skull locking part 13 in the form of a through hole.
b, and then flows onto the receiving surface 13a to form a skull 9 in which the molten metal solidifies. When the molten metal stream 2 is subsequently supplied, the molten metal stream 2 spreads on the skull 9 due to centrifugal force without solidifying.
Next, it separates from the top of Skull 9 and becomes atomized into powder 1.
It becomes 0. At this time, even if there is an imbalance in the thickness of the skull 9, a part of the skull 9 will solidify within the concave skull locking part 13b, and will be transferred to the cooling water 20 via the support plate 14, which has good thermal conductivity. Since the molten metal stream 2 is cooled, the formation of the skull 9 is well maintained even when the temperature of the molten metal stream 2 is high or the flow rate is large, so the skull 9 does not scatter. . By supplying the cooling water 20 and forcibly cooling a portion of the skull 9 in this manner, the stability of the skull 9 can be further increased. Experimental Example 1 In this experiment, a powder production experiment was conducted using a centrifugal spray device using a rotating body 1 having the shape shown in FIG. The experimental conditions are shown in Table 1.

【table】

[Table] As a result of the experiment, when the rotating body 1 shown in FIG. 1 was used, no skull detachment was observed until the centrifugal spraying was completed. On the other hand, when a conventional rotating body without groove-like or protruding locking parts on the surface of the receiving part was used and the experimental conditions were conducted in accordance with the contents shown in Table 1, the amount of molten metal supplied was 2.1 kg. At that point, Skull's departure occurred. Experimental Example 2 In this experiment, a powder production experiment was conducted using a centrifugal spraying apparatus using rotating bodies 1 and 11 having the shapes shown in FIGS. 1 and 2. The experimental conditions are shown in Table 2.

[Table] As a result of the experiment, when the water cooling structure shown in Fig. 2 was used, no skull separation was observed until the end of spraying when the molten metal was supplied at an amount of 25 kg, but when the water cooling structure shown in Fig. 1 was not used, no skull detachment was observed. Skull detachment and scattering was observed at each point of molten metal supply amount of 8.3Kg, 13.6Kg, and 17.0Kg, and the powder yield during powder production decreased slightly. As explained above, according to this idea,
Since we decided to provide a recessed skull locking part on the receiving part of the rotary body used in the centrifugal spraying device to prevent the skull of the molten metal solidified on the receiving part from coming off, it is possible to prevent the receiving part of the rotating body during powder production. It has excellent effects such as being able to prevent skulls formed on the surface of the molten metal receiving part from detaching from the hot water part as much as possible, and avoiding a significant decrease in powder yield due to the detachment of skulls. have

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory cross-sectional views of a rotating body for a centrifugal spray device in each embodiment of this invention. 1, 11... Rotating body, 2... Molten metal flow, 3, 13
... Hot water receiving part, 3a, 13a... Hot water receiving surface, 3b, 1
3b... Concave skull locking part, 7, 17... Rotating shaft, 9... Skull, 10... Powder.

Claims (1)

[Scope of utility model registration request] In a centrifugal spraying device that produces a powder by supplying a molten metal flow to a molten metal receiving part of a rotating body and applying a centrifugal force to the molten metal flow to disperse and atomize the molten metal flow, the molten metal receiving part is provided in a molten metal receiving part of the rotary body. A rotating body for centrifugal spraying, characterized in that a concave skull locking part is provided to prevent the skull of the molten metal solidified above from coming off.