WO2022054334A1

WO2022054334A1 - Molten metal-immersion member

Info

Publication number: WO2022054334A1
Application number: PCT/JP2021/017641
Authority: WO
Inventors: 英気堤
Original assignee: 三井金属鉱業株式会社
Priority date: 2020-09-08
Filing date: 2021-05-10
Publication date: 2022-03-17
Also published as: JP2023123632A; JP7316378B2; JPWO2022054334A1; CN217370438U

Abstract

This molten metal-immersion member is to be immersed in a molten metal, and is characterized by comprising: a tube-shaped member that has an opening; a lid body that covers the opening; and a packing that closes a gap between the opening and the lid body.

Description

Molten metal dipping member

The present invention relates to a heater immersed in a molten metal such as aluminum and a molten metal immersion member for protecting a thermocouple.

In the casting process of aluminum, aluminum alloy, etc., a molten metal holding furnace that heats and keeps the molten metal at a suitable temperature is used. In such a molten metal holding furnace, a heater for heating and retaining the molten metal and a thermocouple for detecting the temperature of the molten metal are protected by the molten metal dipping member and immersed.

As an immersion heater that heats and retains the molten metal, for example, an L-shaped heater for molten metal is disclosed in Patent Documents 1 and 2. The heater for molten metal disclosed in Patent Documents 1 and 2 has a configuration in which a heating element contained therein can be taken in and out through an opening provided in a protective member having a bag tube shape. The opening is configured to be sealed by a lid.

Japanese Unexamined Patent Publication No. 2011-85279 Japanese Unexamined Patent Publication No. 2013-105553

Since the heating element immersed in the molten metal is placed under high temperature conditions for a long period of time, it is necessary to perform regular maintenance. Further, the heating element may need to adjust the position of the heating element in order to appropriately heat the molten metal.

However, since the lid member disclosed in Patent Document 1 has a structure of fitting with the opening of the protective member or a structure of screwing, the fitting surface is while being immersed in the molten metal for a long period of time. In addition, molten metal infiltrates from the screwed surface and sticks to the mating surface or the screwed surface. As a result, the heating element housed inside the protective member cannot be taken out unless the opening of the protective member fixed to the lid member is destroyed as well as the lid member. Further, the lid body disclosed in Patent Document 2 has a plurality of mounting holes, and has a structure in which the heat generating body is screw-fixed to the heat radiating pipe in these mounting holes, so that the lid can be used as a molten metal. During immersion for a long period of time, molten metal infiltrates through the mounting holes and sticks. As a result, when taking out the heating element built in the heat radiation tube, the heating element cannot be taken out unless not only the lid but also the heat radiation tube screwed to the lid is destroyed.

As described above, in the inventions disclosed in Patent Documents 1 and 2, when the heating element is taken out, not only the lid but also the protective member fixed to the lid and the heat radiation tube are destroyed, and the protective member and the protective member are destroyed. , The heat dissipation tube cannot be reused.

Further, when the total length of the heating element exceeds 1 m, it is difficult to visually recognize the tip of the heating element inserted into the bag tube-shaped protective member having one end closed, so that it takes time to adjust the position. rice field.

In view of the above problems, the present invention is to provide a molten metal dipping member that can be easily maintained and that minimizes the portion to be destroyed.

The molten metal dipping member of the present invention made to solve the above problems is a molten metal dipping member immersed in a metal molten metal, and has a tubular member provided with an opening, a lid covering the opening, and the above. It is characterized by having a packing that closes between the opening and the lid.
With this configuration, when the heater and the thermocouple immersed in the molten metal are maintained and the position is adjusted, the heater and the thermocouple can be maintained and the position is adjusted without destroying the tubular member. ..

The molten metal dipping member of the present invention includes a heater inserted into the tubular member and a thermocouple without destroying the tubular member when maintaining or adjusting the position of the heater and the thermocouple immersed in the molten metal. Maintenance and position adjustment can be performed.

It is a schematic explanatory drawing which shows the state which the molten metal dipping member of the embodiment which concerns on this invention is arranged in the metal molten metal. It is sectional drawing of the molten metal dipping member of embodiment which concerns on this invention. It is a partially enlarged sectional view of the molten metal dipping member of the embodiment which concerns on this invention. It is an enlarged sectional view of part A of FIG. It is sectional drawing explaining the modification of the molten metal dipping member of embodiment which concerns on this invention. FIG. 5 is a partially enlarged cross-sectional view of FIG. It is sectional drawing explaining another embodiment of the molten metal dipping member of embodiment which concerns on this invention.

Hereinafter, the molten metal dipping member according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic explanatory view showing a state in which the molten metal dipping member of the embodiment according to the present invention is arranged in the molten metal. Further, FIG. 2 is a cross-sectional view of the molten metal dipping member according to the embodiment of the present invention. Further, FIG. 3 is a partially enlarged cross-sectional view of the molten metal dipping member according to the embodiment of the present invention. Further, FIG. 4 is an enlarged sectional view taken along the line A of FIG.

The molten metal dipping member 10 according to the present embodiment is a molten metal dipping member 10 immersed in the metal molten metal M, and is a tubular member 13 provided with an opening 12, a lid 24 covering the opening 12, and an opening. It has a packing 31 that closes between the 12 and the lid 24. Specifically, as shown in FIGS. 1 to 4, in the molten metal dipping member 10 according to the present embodiment, a female screw 11 is formed on the inner circumference of the opening 12, and the lid 24 is a male screw screwed with the opening 12. A shaft portion 22 on which 21 is formed and a head portion 23 projecting in the outer peripheral direction are provided at one end of the shaft portion 22, and a packing 31 is provided with an end surface 12a of the opening 12 and a seat surface 23a of the head portion 23. Block the space.

As shown in FIG. 2, the tubular member 13 is formed in a cylindrical shape. For example, an opening in which a female screw 11 is formed on the inner circumference on one end side immersed in the metal molten metal M in the molten metal holding furnace 1. A portion 12 is provided. Further, the other end side of the tubular member 13 is opened in a circular shape, and a heat generating element H for heating the molten metal M, a temperature measuring element (not shown) for detecting the temperature of the molten metal M, and the like are inserted. Can be done. The tip of the heat generating element H inserted into the tubular member 13 is preferably fixed in a state of being inserted into a ring-shaped heat insulating board or the like (not shown). Further, on the other end side of the tubular member 13 opened in a circular shape, a plate-shaped heat insulating body (not shown) provided with a through hole through which a lead wire electrically connected to the heat generating element H can be inserted is provided. It is preferable that they are arranged. In such an embodiment, the heat generating element H is held in the tubular member 13.

Here, the tubular member 13 is formed of silicon carbide-based ceramics, silicon nitride-based ceramics, Sialon-based ceramics (SiAlON-based ceramics), or the like. The silicon nitride-based ceramics are preferably composed of silicon nitride (Si _{3N 4} ₎ as a main component, and preferably contain at least one compound of a compound containing yttrium, a compound containing magnesium, or a compound containing aluminum. Examples of the compound containing yttrium include Y ₂ O ₃ , Y ₂ Si ₃ O ₃ N ₄ , Y ₄ Si ₂ O ₇ N ₂ , and oxynitride glass. Examples of the magnesium-containing compound include MgO, Mg ₂ SiO ₄ , MgSiN ₂ , and oxynitride glass. Examples of the compound containing aluminum include Al ₂ O ₃ , Al ₂ SiO ₅ , and oxynitride glass (so-called AlON). In addition, composite ceramics of silicon nitride and silicon carbide are also suitable.

Further, the tubular member 13 preferably has a bending strength of 300 MPa or more and 1200 MPa or less. If the tubular member 13 satisfies this standard, it can be safely used for a long period of time even when immersed in the molten metal M. The bending strength of the tubular member 13 is a three-point bending strength and can be measured according to JIS R1601.

The heat generating element H for heating the molten metal M inserted in the tubular member 13, for example, a heater is electrically connected to an external power source. Although not shown, the element inserted into the tubular member 13 may be a temperature measuring element for detecting the temperature of the molten metal M, for example, a thermocouple, instead of the heat generating element H for heating the molten metal M.

The lid 24 is provided with a shaft portion 22 on which a male screw 21 screwed with the opening portion 12 of the tubular member 13 is formed, and a head portion 23 protruding in the outer peripheral direction at one end of the shaft portion 22. The opening 12 is sealed by screwing the male screw 21 formed on the shaft portion 22 and the female screw 11 formed on the opening 12.

Here, the lid 24 is formed of a material having a lower strength than the tubular member 13. Specifically, the strength of the lid 24 is preferably 10 MPa or more and 100 MPa or less. The strength of the lid 24 can be measured according to the JISR2213: 2005 bending strength test method for refractory bricks. Even if it is difficult to remove the lid 24 from the tubular member 13 during maintenance of the heat generating element H, the lid 24 can be destroyed and the heat generating element H can be maintained without damaging the tubular member 13. can.

The packing 31 closes between the end surface 12a of the opening 12 and the seat surface 23a of the head 23. That is, as shown in FIG. 3, the packing 31 is arranged between the end surface 12a of the opening 12 and the seat surface 23a of the head 23. Further, from the viewpoint of improving the obstruction between the end surface 12a of the opening 12 and the seat surface 23a of the head 23 by the packing 31, the end surface 12a of the opening 12 and the seat surface 23a of the head 23 are closed. The thickness of the packing 31 is preferably 0.1 mm or more and 10 mm or less, and more preferably 0.2 mm or more and 5.0 mm or less.

The packing 31 is preferably compressed to a thickness of 10% or more and 90% or less based on the thickness before the shaft portion 22 of the lid 24 is screwed into the opening 12 of the tubular member 13. Further, the packing 31 is compressed to a thickness of 30% or more and 60% or less based on the thickness before the shaft portion 22 of the lid 24 is screwed into the opening 12 of the tubular member 13. More preferred. With such a configuration, sufficient occlusion can be ensured by the packing 31 between the end surface 12a of the opening 12 and the seat surface 23a of the head 23.

In this way, the packing 31 closes between the end surface 12a of the opening 12 and the seating surface 23a of the head portion 23, so that the metal is arranged even when the molten metal dipping member 10 is arranged in the molten metal M. Maintenance of the heat generating element H is performed because the molten metal M does not invade the threaded surface between the opening 12 and the shaft portion 22, and the lid 24 and the tubular member 13 are not fixed and integrated by the metal molten metal M. At this time, the lid 24 can be removed without damaging the tubular member 13.

Here, the packing 31 is formed of the ceramic fiber paper material shown below. Specific examples of the ceramic fiber paper material include alumina, silica, and mullite. The density of the packing 31 is preferably 100 kg / m ³ or more and 500 kg / m ³ or less. Further, the normal temperature tensile strength of the packing 31 is preferably 0.01 MPa or more and 0.3 MPa or less in both the vertical direction and the horizontal direction.

The packing 31 preferably has a hollow circular shape, and when the width dimension of the arc (that is, the dimension calculated from (outer diameter-inner diameter) / 2) is 3 mm or more and 10 mm or less, the packing 31 has sufficient strength and sealing property. It is preferable from the viewpoint of. Further, the inner diameter of the packing 31 is preferably such that a gap of 0.5 mm or more and 5 mm or less is provided with respect to the outer diameter of the shaft portion 22 of the lid 24.

Further, the molten metal dipping member 10 has a filling joint material 41 that fills the gap created by the packing 31 located between the head 23 of the lid 24 and the opening 12 of the tubular member 13. As shown in FIG. 4, when the outer diameter of the packing 31 is smaller than the outer diameter of the seat surface 23a related to the head portion 23 of the lid 24, a gap is formed on the outer peripheral side of the packing 31. Therefore, the filling joint material 41 can protect the packing 31 by filling the gap. On the other hand, when the outer diameter of the packing 31 is the same as or larger than the outer diameter of the seat surface 23a related to the head 23, even if the filling joint material 41 covers the outer periphery of the lid 24 and the packing 31. good. The filling joint material 41 is preferably a material that can withstand use at a high temperature and does not easily absorb the molten metal M, for example, an alumina mortar material.

Further, the molten metal dipping member 10 has a covering joint material 42 that covers the outer peripheral surface 23b of the head portion 23 of the lid 24 and the end surface 12a of the opening portion 12 of the tubular member 13. By covering the outer peripheral surface 23b of the head 23 of the lid 24 and the end surface 12a of the opening 12 of the tubular member 13, the joint material 42 for covering improves the releasability of the molten metal M. When the joint material 42 for coating is formed of a metal that is melted in metal, for example, a material having a large wetting angle with molten aluminum, for example, zircon (ZrSiO ₄ ), a boron nitride (BN) -based mortar material, or the like. good.

The step of closing the opening 12 by the lid 24 of the molten metal dipping member 10 according to the present embodiment will be described below.

First, the female mesh 11 of the opening 12 and the male screw 21 of the shaft portion 22 are screwed together. Since the packing 31 is arranged between the end surface 12a of the opening 12 and the seat surface 23a of the head 23, the packing 31 is placed between the end surface 12a of the opening 12 and the seat surface 23a of the head 23. To block. Here, the thickness dimension of the packing 31 that closes between the end surface 12a of the opening 12 and the seat surface 23a of the head 23 is preferably 0.1 mm or more and 10 mm or less. Further, the packing 31 is compressed to a thickness of 10% or more and 90% or less based on the thickness before the shaft portion 22 of the lid 24 is screwed into the opening 12 of the tubular member 13. good.

Next, the filling joint material 41 is filled in the gap created by the packing 31 located between the head 23 of the lid 24 and the opening 12 of the tubular member 13. Further, the joint material for covering 42
The covering joint material 42 is applied so that the outer peripheral surface 23b of the head 23 of the lid 24 and the end surface 12a of the opening 12 of the tubular member 13 are all covered.

Then, the molten metal dipping member 10 coated with the outer peripheral surface 23b of the head 23 of the lid 24 and the end surface 12a of the opening 12 of the tubular member 13 was naturally dried for 24 hours and then heated to 100 ° C. in a dryer. dry.

Further, the process of removing the lid 24 in the maintenance of the heat generating element H of the molten metal dipping member 10 according to the present embodiment will be described below.

First, the molten metal dipping member 10 arranged in the molten metal M is pulled out of the molten metal M.

Next, the covering joint material 42 that covers the outer peripheral surface 23b of the head 23 of the lid 24 and the end surface 12a of the opening 12 of the tubular member 13 is removed. Here, if the joint material 42 for coating is formed of a metal that is melted by a metal, for example, a material having a large wetting angle with molten aluminum, the aluminum is less likely to be fixed. Subsequently, the filling joint material 41 filled in the gap created by the packing 31 located between the head 23 of the lid 24 and the opening 12 of the tubular member 13 is removed.

Then, when the screwed lid 24 is removable, the heat generating element H or the like inserted in the tubular member 13 can be taken out by loosening the male screw of the lid 24 and removing it from the opening 12. After the replacement work and maintenance work of the heat-generating element H taken out are completed, the heat-generating element H can be inserted into the tubular member 13 again, and the opening 12 can be sealed by the lid 24. That is, the tubular member 13 and the lid 24 can be reused.

On the other hand, if it is difficult to remove the screwed lid 24, the lid 24 may be broken by using a tool. Here, since the lid 24 is made of a material having a lower strength than the tubular member 13, it can be handled as a consumable part in which only the lid 24 is destroyed without damaging the tubular member 13. The tubular member 13 can be reused.

In addition to the maintenance of the heating element H, if the metal molten metal M in the molten metal holding furnace 1 cannot be appropriately heated due to the position of the heating element H inserted in the molten metal immersion member 10, the lid 24 is used as described above. It can be removed to adjust the position of the heat generating element H.

As a modification of the molten metal dipping member 10 according to the above-described embodiment, there is a molten metal dipping member 50 as shown in FIGS. 5 and 6. The same components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

Like the molten metal dipping member 10, the molten metal dipping member 50 is a molten metal dipping member 50 immersed in the metal molten metal M, and includes a tubular member 53 provided with an opening 52 and a lid 64 covering the opening 52. , A packing 71 that closes between the opening 52 and the lid 64.

Specifically, as shown in FIGS. 5 and 6, the tubular member 53 has a male screw 51 and a stepped portion 54 extending in the outer peripheral direction formed on the outer periphery of the opening 52, and the lid 64 has the opening 52. A top plate portion 63 that covers the top plate portion 63, and a peripheral wall portion 62 that projects from the peripheral edge portion of the top plate portion 63 toward the tubular member 53 and has a female screw 61 formed on the inner circumference thereof to be screwed with the opening 52. 71 closes between the stepped portion 54 of the opening 52 and the end surface 62a of the peripheral wall portion 62.

As shown in FIG. 5, the tubular member 53 is formed in a cylindrical shape. For example, the tubular member 53 has a male screw 51 and an outer circumference on the outer periphery of the opening 52 on one end side immersed in the metal molten metal M in the molten metal holding furnace 1. A step portion 54 extending in the direction is formed. Further, the other end side of the tubular member 53 is opened in a circular shape, and a heat generating element H for heating the molten metal M, a temperature measuring element (not shown) for detecting the temperature of the molten metal M, and the like are inserted. Can be done. The material of the tubular member 53 and the bending strength may be the same as those of the tubular member 13 and the bending strength.

The lid 64 has a top plate portion 63 that covers the opening 52, and a female screw 61 that projects from the peripheral edge portion of the top plate portion 63 toward the tubular member 53 and is screwed with the opening 52 on the inner circumference thereof. A peripheral wall portion 62 is provided. The opening 52 is sealed by screwing the female screw 61 formed on the peripheral wall portion 62 and the male screw 51 formed on the opening. The material of the lid 64 and the bending strength may be the same as those of the lid 24 and the bending strength.

The packing 71 closes between the stepped portion 54 of the opening 52 and the end surface 62a of the peripheral wall portion 62. That is, as shown in FIG. 6, the packing 71 is arranged between the step portion 54 of the opening 52 and the end surface 62a of the peripheral wall portion 62. Further, the thickness dimension, material, shape and the like of the packing 71 may be the same as the thickness dimension, material and shape of the packing 31.

Further, the molten metal dipping member 50 is a filling joint material that fills the gap created by the packing 71 located between the peripheral wall portion 62 of the lid 64 and the opening 52 of the tubular member 53, similarly to the molten metal dipping member 10. Has 81. Since the filling joint material 81 has the same configuration as the filling joint material 41, detailed description thereof will be omitted.

Further, the molten metal dipping member 50 has a covering joint material 82 that covers the end surface 62a of the peripheral wall portion 62 of the lid 64 and the stepped portion 54 of the opening 52. Since the covering joint material 82 has the same configuration as the covering joint material 42, detailed description thereof will be omitted.

The step of closing the opening 52 by the lid 64 of the molten metal dipping member 50 or the step of removing the lid 64, which is a modification of the present embodiment, is the same as each step of the molten metal dipping member 50. The explanation is omitted.

The molten metal dipping member 50, which is a modification of the molten metal dipping member 10 according to the present embodiment, has a male screw 51 formed on the outer peripheral side of the tubular member 53, and it is easy to form the male screw 51, so that the manufacturing cost is high. Can be reduced. Further, it is easy to design the shape of the lid 64 to be suitable for the usage environment and the application.

Another embodiment of the present invention is a U-shaped molten metal dipping member 100 as shown in FIG. 7. The same components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The tubular member 131 has

openings

12 and 12 formed at both ends thereof. The

openings

12 and 12 are sealed by the

lids

24 and 24, respectively. Here, the packing 31 closes between the end surface 12a of the opening 12 and the seat surface 23a of the head 23. The filling joint material may be used to fill the gap created by the packing 31 located between the head 23 of the lid 24 and the opening 12 of the tubular member 131. Further, the outer peripheral surface 23b of the head portion 23 of the lid 24 and the end surface 12a of the opening portion 12 of the tubular member 131 may be covered with the covering joint material.

For example, in the embodiment shown in FIG. 7 in which both ends of the heat generating element H are electrically connected to the terminals, if the

openings

12 and 12 are provided at both ends of the tubular member 131, maintenance work efficiency and maintenance work efficiency can be improved. , The damage prevention rate of the tubular member 131 is improved. Further, in the embodiment in which the longitudinal dimension of the tubular member 131 is long, the heat generating element H and the temperature measuring element are efficiently installed from the

openings

12 and 12 provided at both ends of the tubular member 131, and their positions can be easily adjusted. Can be.

The invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification to the extent applicable, in addition to the configurations of the inventions and embodiments, or these. Includes those specified by adding other configurations disclosed in the present specification to the configurations of the above, or those specified by deleting these partial configurations to the extent that partial effects can be obtained.

The embodiment of the present invention can be a T-shaped or L-shaped molten metal dipping member as appropriate, in addition to the linear or U-shaped molten metal dipping member described above. Further, the tubular member according to the embodiment of the present invention has a shape in which an opening is formed at the end thereof, but the opening may be formed not at the end but at the outer peripheral surface.

1 ... molten

metal holding furnace

10, 50 ... molten

metal dipping member

11, 61 ...

female screw

12, 52 ... opening 12a, 62a ... end

face

13, 53, 131 ...

tubular member

21, 51 ... male screw 22 ... shaft 23 ... head 23a ... Seat surface 23b ... Outer

peripheral surfaces

24, 64 ...

Lid bodies

31, 71 ...

Packing

41, 81 ... Filling

joint material

42, 82 ... Covering joint material 54 ... Step portion 62 ... Peripheral wall portion 63 ... Top plate portion 100 ... U Character-shaped molten metal immersion member H ... Heat generating element M ... Metallic molten metal

Claims

A molten metal dipping member that is immersed in a metal molten metal.
A tubular member with an opening and
A lid covering the opening and
A packing that closes between the opening and the lid,
A molten metal dipping member characterized by having.
A female screw is formed on the inner circumference of the opening.
The lid body includes a shaft portion on which a male screw to be screwed with the opening portion is formed, and a head portion protruding in the outer peripheral direction at one end of the shaft portion.
The molten metal dipping member according to claim 1, wherein the packing closes between the end surface of the opening and the seat surface of the head.
A male screw and a stepped portion extending in the outer peripheral direction are formed on the outer periphery of the opening.
The lid has a top plate portion that covers the opening and a peripheral wall portion that projects from the peripheral edge portion of the top plate portion toward the tubular member side and has a female screw formed on the inner circumference thereof to be screwed with the opening portion. And with
The molten metal dipping member according to claim 1, wherein the packing closes between the stepped portion of the opening and the end surface of the peripheral wall portion.
The molten metal dipping member according to any one of claims 1 to 3, further comprising a filling joint material that fills a gap created by the packing located between the lid and the opening.
The molten metal dipping member according to claim 2, further comprising a covering joint material that covers the outer peripheral surface of the head and the end surface of the opening.
The molten metal dipping member according to claim 3, which has a joint material for covering that covers the end surface of the peripheral wall portion and the stepped portion of the opening portion, or claim 4, which is subordinate to claim 3.
The molten metal dipping member according to any one of claims 1 to 6, wherein the lid is made of a material having a strength lower than that of the tubular member.
The molten metal dipping member according to any one of claims 1 to 7, wherein the thickness of the packing is 0.1 mm or more and 10 mm or less.
The molten metal dipping member according to any one of claims 1 to 8, wherein the packing is compressed to a thickness dimension of 10% or more and 90% or less.
The molten metal dipping member according to any one of claims 1 to 9, wherein a heat generating element for heating the molten metal is housed inside the tubular member.
The molten metal dipping member according to any one of claims 1 to 10, wherein a temperature measuring element for detecting the temperature of the molten metal is housed inside the tubular member.