JP2006305616A - Molten metal feeding device and molten metal feeding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal feeding device and a molten metal feeding method capable of preventing the occurrence of turbulent flow of molten metal and the entrapment of air into the molten metal at the time of feeding the molten metal. <P>SOLUTION: A nozzle part 10c is arranged at the tip end of a pipe part 10b so that the center axis Q of the nozzle part 10c inclines by angle α (0°≤α≤30°) to the center axis P of the pipe part 10b in the case of projecting the pipe part 10b and the nozzle part 10c on the perpendicular surface. The pipe part 10b, the nozzle part 10c and a die casting sleeve 20 are arranged so that α<SB>2</SB>≥α<SB>1</SB>is satisfied, thereby allowing the molten metal to smoothly flow out of a molten metal feed hole 10d, and suppressing the occurrence of the turbulent flow of the molten metal flowing out of the molten metal feed hole 10d. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus and a hot water supply method suitable for supplying molten metal such as magnesium melt to a die casting sleeve or the like.

  For example, as a hot water supply device for supplying molten magnesium to a die casting sleeve of a die casting machine, for example, there is one described in Patent Document 1 below. Such a water heater generally has a configuration as shown in FIG.

A hot water supply apparatus 1 shown in FIG. 1 is stored in a melting furnace 3 and is provided with a melting pot 2 having a lid 4 and an injection piston which is vertically arranged on the central axis in the melting pot 2 and is slidable in the vertical direction. An injection sleeve 5 having an opening 6 at one end, connected to the injection sleeve 5 at right angles to the lower end of the injection sleeve 5 and extending outside the furnace, and controlling the inflow of the molten magnesium 8 into the hot water pipe 10 A suction valve 7 for opening and closing the opening 10a, and an introduction pipe 9 for sealing an inert gas, a flame-retardant gas such as SF ₆ or SO ₂ into the melting pan 2 to prevent oxidation of the active magnesium melt. , Etc.

  The injection piston 6 is connected to an injection cylinder 11 fixed on the lid body 4 via a piston rod 12 and is raised and lowered by the operation of the injection cylinder 11. The suction valve 7 is connected to a valve cylinder 16 fixed on the lid 4 via a valve rod 17 and is raised and lowered by the valve cylinder 16. The opening 10a is opened when the suction valve 7 is raised and closed when lowered. In the open state, the molten magnesium 8 in the melting pot 2 flows into the hot water supply pipe 10. The injection sleeve 5 forms a pressurizing chamber for taking out the molten magnesium 8 in the melting pot 2 (more specifically, the molten magnesium 8a flowing into the hot water supply pipe 10) out of the furnace.

  In the hot water supply apparatus 1 configured as described above, first, the suction valve 7 is opened and the molten magnesium 8 is allowed to flow into the hot water supply pipe 10. Subsequently, the suction valve 7 is closed and the injection piston 6 is lowered. Let As a result, the molten magnesium 8a flowing into the hot water supply pipe 10 passes through the pipe portion 10b outside the furnace in the hot water supply pipe 10 and the nozzle portion 10c serving as the outlet portion flowing out of the furnace by the pressurization by the injection piston 6. Then, it is discharged into the die casting sleeve 20 near the outside of the furnace. In the die-casting sleeve 20, the magnesium melt 8 a is pushed away in the direction of the arrow in FIG. 1 by the piston operation of the die-casting piston 21, and is injected into a die of a die-casting machine (not shown). Here, an electric heater 18 for heating is provided around the pipe portion 10b of the hot water supply pipe 10. By using this heater 18, solidification of the magnesium melt 8a during hot water supply is prevented.

  The conventional hot water supply apparatus is disclosed in, for example, the following patent documents 2 and 3 in addition to the following patent document 1.

JP 7-40026 A JP 2001-87850 A JP-A-8-206810

  In the conventional hot water supply apparatus having the above-described configuration, the nozzle portion 10 c of the hot water supply pipe 10 is attached perpendicularly to the die casting sleeve 20, and the molten magnesium 8 a flowing out from the nozzle portion 10 c is perpendicular to the die casting sleeve 20. Injected in the direction. In other words, the molten magnesium 8 a falls from the nozzle portion 10 c to the die casting sleeve 20.

  At this time, a situation occurs in which air is caught in the molten magnesium 8a while the magnesium melt 8a is dropped from the nozzle portion 10c to the die casting sleeve 20 or after the dropping. The air entrainment at the time of dropping occurs when the fall distance is long, or when the magnesium melt 8a that has fallen hits the inner wall of the die-cast sleeve 20 and the flow of the magnesium melt 8a is disturbed. It becomes a big problem in hot water supply technology. In other words, when the entrained air is mixed into the magnesium melt 8a and injected into the die of the die casting machine from the die casting sleeve 20 to manufacture the die casting product, the mixed air is contained in the manufactured die casting product. Therefore, such a defect causes a problem that the quality of the product is deteriorated.

  In addition, the mixing of the air into the molten magnesium 8a occurs not only when it falls from the nozzle portion 10c but also while the molten magnesium 8a flows through the pipe portion 10b and the nozzle portion 10c of the hot water supply pipe 10. .

  In particular, since the molten magnesium 8a has the property that the specific heat is small and active, in the hot water supply device for the molten magnesium 8a, the molten magnesium 8a flowing in the pipe is required to realize a constant amount of hot water supply to the die casting sleeve 20 in a short time. It is necessary to increase the flow rate. However, when the flow velocity in the pipe is increased, the molten magnesium 8a becomes a turbulent state, so that the air is easily trapped in the molten magnesium 8a flowing in the hot water supply pipe 10, and the entrained air is in a turbulent state. The magnesium melt 8a is less likely to be released to the outside. As a result, there remains a problem that the quality of the die-cast product is deteriorated due to a defect due to air remaining in the molten magnesium 8a.

  In addition, a pipe having a circular cross section is generally adopted as the pipe used for the pipe portion 10b and the nozzle portion 10c of the hot water supply pipe 10, but when a pipe having a circular cross section is used, an increase in the magnesium melt 8a flowing in the pipe is increased. The amount of change in the depth of the magnesium melt 8a with the amount is large, and a turbulent state is likely to occur. Accordingly, the air is likely to be caught in the molten magnesium 8a flowing through the hot water supply pipe 10, and the entrained air is not easily released from the turbulent molten magnesium 8a to the outside, and remains in the molten magnesium 8a. However, there is a problem that the quality of the die-cast product is deteriorated due to air defects.

  The objective of this invention is providing the hot-water supply apparatus and hot-water supply method which can prevent generation | occurrence | production of the turbulent flow of a molten metal at the time of hot-water supply, and the entrainment of the air in a molten metal.

  The present invention provides a hot water supply apparatus for supplying molten metal in a melting furnace to the outside of the melting furnace through a hot water supply pipe communicating from the inside of the melting furnace to the outside, wherein the hot water pipe includes the molten metal from the melting furnace. A pipe part that passes through, and a nozzle part that is provided at the tip of the pipe part and discharges the molten metal that has passed through the pipe part from the melting furnace to the outside, and projects the pipe part and the nozzle part onto a vertical plane. In this case, the nozzle portion is provided at the tip of the pipe portion with the central axis of the nozzle portion inclined with respect to the central axis of the pipe portion.

  Here, in the state where the central axis of the nozzle part is inclined at an angle of 30 ° or less with respect to the central axis of the pipe part when the pipe part and the nozzle part are projected onto a horizontal plane, It is preferable that the nozzle part is provided at the tip of the pipe part.

  Further, the cross-sectional shape of the pipe portion and the cross-sectional shape of the nozzle portion in the vicinity of the connection portion with the nozzle portion are substantially elliptical shapes in which major axes are arranged in the horizontal direction, or the lower side is wider than the upper side. A substantially trapezoidal shape is preferred.

  Furthermore, it is preferable that the cross-sectional shape of the nozzle part is adjusted so that the supply amount of the molten metal from the nozzle part is 1 to 2 kg / s, and further, the nozzle part with respect to the pipe part. More preferably, the inclination angle is adjusted so that the amount of molten metal supplied from the nozzle portion is 1 to 2 kg / s.

  Further, it is preferable that the nozzle portion includes a rectifying means for making the molten metal flow into a laminar flow state, and further, the flow rate of the molten metal discharged from the tip opening of the nozzle portion is suppressed, It is more preferable to provide guide means for gently flowing the gas downward from the tip opening.

  The present invention is also a hot water supply method for supplying a molten metal in a melting furnace to a die casting sleeve using the hot water supply apparatus having the above-described configuration, wherein the nozzle part and the die casting sleeve are projected onto a horizontal plane. The nozzle portion is arranged with respect to the die casting sleeve so that the central axis of the portion is inclined at an angle of 30 ° or less with respect to the central axis of the die casting sleeve, and the drop from the nozzle portion to the die casting sleeve The molten metal is supplied with the height as low as possible.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the turbulent flow of the molten metal at the time of hot water supply and the entrainment of the air in a molten metal can be prevented. Therefore, for example, if the molten metal is supplied to the die-casting sleeve of the die-casting machine using the hot-water supply device of the present invention, it is possible to prevent the deterioration of the quality of the die-cast product manufactured by the die-casting machine by preventing the entrainment of air during the hot-water supply. .

  The hot water supply apparatus in the embodiment of the present invention has the same configuration as that of the conventional hot water supply apparatus shown in FIG. 1, but the configuration of the hot water supply pipe 10 (particularly, the pipe portion 10b and the nozzle portion 10c) in FIG. The configuration is different from the conventional one. Hereinafter, the configuration of the hot water supply pipe 10 in the hot water supply apparatus of the present embodiment will be described with reference to FIGS. 2 to 6. In the following description, a hot water supply device for supplying molten magnesium will be described as an example.

  2 and 3 are views showing the vicinity of the hot water supply port 10d of the hot water supply pipe 10 in a state of supplying hot water to the die casting sleeve 20. FIG. The hot water supply pipe 10 in the hot water supply apparatus of the present embodiment has a configuration having a pipe portion 10b and a nozzle portion 10c provided at the end of the pipe portion 10b, as in the conventional case.

The nozzle portion 10c discharges the molten magnesium 8a from the pipe portion 10b to the outside from the hot water supply port 10d, and the size of the cross section gradually decreases from the connecting portion with the pipe portion 10b toward the hot water supply port 10d. Yes. As shown in FIGS. 2 and 3, the nozzle portion 10c is inclined with respect to the pipe portion 10b. Specifically, first, as shown in FIG. 2, when the pipe portion 10b and the nozzle portion 10c are projected onto a vertical plane, the angle α formed by the central axis P of the pipe portion 10b and the central axis Q of the nozzle portion 10c is 30 °. It is inclined to be as follows. That is, it is inclined so that 0 ° ≦ α ≦ 30 °. As further in FIG. 3 (a), the angle beta ₁ of the center axis Q of the central axis P and the nozzle portion 10c of the pipe portion 10b is 30 ° or less in the case of projecting the pipe portion 10b and the nozzle portion 10c in a horizontal plane It is inclined to become. That is, it is inclined so that 0 ° ≦ β ₁ ≦ 30 °. The nozzle portion 10c may be inclined with respect to the pipe portion 10b on the side opposite to that shown in FIG. 3A, that is, as shown in FIG. If you like to be the FIG. 3 (b), the as center axis inclination angle beta ₁ of Q of the nozzle portion 10c with respect to the center axis P of the pipe portion 10b is _{0 ° ≦ β 1 ≦ 30 °} , the nozzle portion 10c Is inclined with respect to the pipe portion 10b.

  And when supplying hot water using the hot water supply pipe 10 in which the nozzle portion 10c is inclined with respect to the pipe portion 10b as described above, the nozzle portion 10c is arranged with respect to the opening 20a of the die casting sleeve 20 as will be described later. By doing so, it is possible to prevent the occurrence of turbulent flow in the magnesium melt 8a. Details will be described later.

  Moreover, in this embodiment, the cross-sectional shape of the pipe part 10b is made into the elliptical shape whose major axis is a horizontal direction like FIG.4 (a), for example, or the trapezoid which spreads from upper direction to the downward | lower direction like FIG.4 (b). Shape. This is because, in a pipe having such an elliptical or trapezoidal cross section, the depth of the magnesium melt 8a accompanying the increase in the amount of the magnesium melt 8a flowing in the pipe is greater than when a pipe having a conventional circular cross section is used. There is an advantage that the amount of change in is small and it is difficult to be in a turbulent state, that is, a laminar state can be realized. Therefore, by setting the cross-sectional shape of the pipe portion 10b in this way, it is possible to prevent air from being caught in the molten magnesium 8a due to a turbulent state in the pipe portion 10b.

  In addition, when making the cross-sectional shape of the pipe part 10b into the above elliptical shape or trapezoidal shape, it is preferable to make the whole pipe part into an elliptical shape or a trapezoidal shape, but at least the connection part with the nozzle part 10c in the pipe part 10b. The cross-sectional shape of the vicinity may be an elliptical shape or a trapezoidal shape.

  Furthermore, in the present embodiment, the cross-sectional shape of the nozzle portion 10c is also an elliptical shape whose major axis is in the horizontal direction, or a trapezoidal shape in which the lower portion is wider than the upper portion, in accordance with the cross-sectional shape of the pipe portion 10b. That is, when the cross-sectional shape of the pipe portion 10b is an elliptical shape, the cross-sectional shape of the nozzle portion 10c is an elliptical shape as shown in FIG. Therefore, the overall shape of the nozzle portion 10c in this case is an elliptic frustum shape. Moreover, when the cross-sectional shape of the pipe part 10b is trapezoidal shape, the cross-sectional shape of the nozzle part 10c becomes trapezoidal shape like FIG.5 (b). Accordingly, the overall shape of the nozzle portion 10c in this case is a square frustum (trapezoid frustum) having a trapezoidal cross section.

  Here, it is preferable to provide the rectifying means 13 for bringing the molten magnesium 8a into a laminar flow state inside the nozzle portion 10c. As the rectifying means 13, for example, a zigzag star-shaped cross section is formed as shown in FIGS. 5 (a) and 5 (b), and the magnesium melt 8a is passed through the inside of the star-shaped cross section to form a laminar flow state. And a rectifying plate having a plurality of slits 13a for passing a molten magnesium 8a as shown in FIGS. 6A and 6B into a laminar flow state. By providing such a rectifying means 13 inside the nozzle portion 10c, the flow rate of the molten magnesium 8a from the pipe portion 10b can be relaxed to be in a laminar flow state. Further, since the nozzle portion 10c is inclined with respect to the pipe portion 10b, a turbulent flow is generated at the connection portion between the pipe portion 10b and the nozzle portion 10c, but the flow of the turbulent molten magnesium 8a thus generated is A laminar flow state can be obtained by passing the rectifying means 13 as described above. Therefore, it is possible to further prevent the occurrence of air entrainment due to the turbulent state.

  The rectifying means 13 is not a rectifying plate separate from the nozzle portion 10c, but the inner surface of the nozzle portion 10c has a star-shaped cross section, or a plurality of slits 13a are directly formed inside the nozzle portion 10c. Also good. However, foreign substances such as an oxide film in the molten magnesium 8a may be trapped on the inner wall surface of the star-shaped cross section or the slit 13a. This is preferable in terms of supplying clean molten magnesium 8a, but on the other hand, if this foreign matter accumulates in the rectifying plate, there is a risk of hindering stable flow. Therefore, it is preferable from the viewpoint of maintenance that the rectifying means 13 is a rectifying plate as described above that is separate from the nozzle portion 10c, and that the rectifying plate is detachable from the nozzle portion 10c. For example, a part of the side wall of the nozzle part 10c may be configured to be openable and closable so that the rectifying plate in the nozzle part 10c can be attached and detached from here.

  Furthermore, it is preferable to provide a pin-shaped or plate-shaped guide means 14 at the upper edge of the hot water supply port 10d of the nozzle portion 10c so that the magnesium melt 8a flowing out from the hot water supply port 10d does not flow out of flow and be disturbed. It is. According to this, since at least a part of the molten magnesium 8a flowing out from the hot water supply port 10d flows into the opening 20a of the lower die casting sleeve 20 through the guide means 14, the magnesium flowing out from the hot water supply port 10d. Compared with the case where all of the molten metal 8a directly flows into the opening 20a of the die-cast sleeve 20, the outflow momentum of the molten magnesium 8a is suppressed, and a mild hot water supply can be realized without disturbing the molten magnesium 8a. Therefore, it is possible to further prevent the air from being entrained when the molten magnesium 8a falls to the die casting sleeve 20 and the flow is disturbed by the magnesium molten metal 8a hitting the inner wall of the die casting sleeve 20 after dropping. It becomes possible.

  Moreover, in the hot water supply pipe 10 in this embodiment, as shown in FIG. 2, heating means 15 such as a band heater is built in the side walls of the pipe portion 10b and the nozzle portion 10c. Thereby, since the magnesium melt 8a which flows through the inside of the pipe part 10b and the nozzle part 10c is heated and heat-retained, solidification of the magnesium melt 8a during hot water supply can be prevented. Accordingly, a stable flow rate and flow rate of the molten magnesium 8a can be ensured, and the molten magnesium 8a can be flowed without delay.

When the hot water supply device having the hot water supply pipe 10 including the pipe portion 10b and the nozzle portion 10c having the above-described configuration is used to heat the magnesium melt 8a to the die casting sleeve 20 while keeping the heat by the heating means 15, FIG. 2 and FIG. Arrange as shown in the figure and perform hot water supply. Specifically, first, as shown in FIG. 2, when the pipe portion 10 b, the nozzle portion 10 c and the die casting sleeve 20 are projected onto the vertical plane, the central axis Q of the nozzle portion 10 c and the horizontal direction (in other words, the die casting sleeve 20 The relationship between the angle α ₂ formed by the central axis or the operation direction of the die cast piston 21) R and the angle α ₁ formed by the central axis P of the pipe portion 10b and the horizontal direction R (α ₁ = α ₂ −α) Arrangement is such that α ₂ ≧ α ₁ . Further, as shown in FIG. 3A, an angle β ₂ formed by the central axis Q of the nozzle portion 10 c and the central axis R of the die casting sleeve 20 when the pipe portion 10 b, the nozzle portion 10 c and the die casting sleeve 20 are projected onto the horizontal plane is The hot water supply port 10d of the nozzle part 10c is arranged with respect to the opening part 20a of the die-casting sleeve 20 so as to be 30 ° or less, that is, 0 ° ≦ β ₂ ≦ 30 °. Then, the position of the nozzle portion 10c is adjusted, and hot water is supplied with the hot water supply port 10d of the nozzle portion 10c as close to the opening 20a of the die casting sleeve 20 as possible.

The central axis Q of the nozzle portion 10c may be inclined with respect to the central axis R of the die casting sleeve 20 on the side opposite to the side shown in FIG. 3A, that is, as shown in FIG. Good. That is, at the time of hot water supply, the pipe portion 10b and the nozzle portion 10c are set so that 0 ° ≦ β ₁ ≦ 30 ° and 0 ° ≦ β ₂ ≦ 30 ° in each aspect shown in FIG. 3 (a) and FIG. 3 (b). It is preferable to arrange the hot water supply pipe 10 including the die casting sleeve 20.

Thus, when hot water is supplied in a state where the above arrangement conditions are satisfied, an angle change of α ₂ ≧ α ₁ is applied between the pipe portion 10b, the nozzle portion 10c, and the die-cast sleeve 20, so the magnesium melt 8a is It is possible to smoothly flow out from the hot water supply port 10d, and it is possible to suppress the occurrence of turbulence of the molten magnesium 8a flowing out from the hot water supply port 10d. In particular, when α is larger than 30 °, disturbance occurs when the molten magnesium 8a flowing in the pipe portion 10b hits the inner wall of each portion (particularly, the inner wall at the connection portion between the pipe portion 10b and the nozzle portion 10c). This causes air entrainment. Therefore, by setting α to 30 ° or less, it is possible to minimize the turbulence that occurs when the molten magnesium 8a flowing in the pipe portion 10b hits the inner wall of each portion, thereby preventing air entrainment, and the molten magnesium 8a. Can flow out smoothly from the hot water supply port 10d.

Similarly, the angle beta ₂ in the horizontal direction of the pipe portion 10b and the angle beta ₁ and the nozzle portion 10c and the die casting sleeve 20 in the horizontal direction of the nozzle portion 10c, beta _1, beta ₂ are both 30 ° or less and By doing so, the disturbance which arises when the flowing magnesium molten metal 8a hits the inner wall of each part can be suppressed to the minimum. Furthermore, beta _{by 2} to 30 ° or less, the center axis Q for direction can be as much as possible close to the central axis R of the die-casting sleeve 20, molten magnesium 8a is die casting sleeve which has fallen from the nozzle portion 10c of the nozzle portion 10c Disturbances that occur when hitting the 20 inner walls can be minimized.

  In particular, when a casing (not shown) housing a driving device such as a motor for operating the die casting piston 21 is connected to the end of the die casting sleeve 20 on the die casting piston 21 side, this casing is avoided. However, depending on the size of the casing, the nozzle portion 10c of the hot water supply pipe 10 may be disposed perpendicular to the die casting sleeve 20 as in the prior art. Alternatively, as shown in FIG. 3, a situation occurs in which the pipe portion 10b and the nozzle portion 10c have to be disposed obliquely with respect to the axial direction R of the die casting sleeve 20 (the operation direction of the die casting piston 21). However, even in such a case, the hot water supply apparatus in the present embodiment is used so that the pipe portion 10b and the nozzle portion 10c of the hot water supply pipe 10 satisfy the above-described arrangement conditions with respect to the die casting sleeve 20 while avoiding the casing. By disposing, it is possible to suppress the turbulence in the flow of the magnesium melt 8a due to a drop from the nozzle portion 10c or due to falling and hitting the inner wall of the die casting sleeve 20, and the occurrence of air entrainment can be prevented.

  In the present embodiment, not only the pipe portion 10b and the nozzle portion 10c are configured as described above, but also the rectifying means 13 and the guide means 14 are provided, so that the occurrence of air entrainment can be further prevented. it can.

  As described above, according to the hot water supply device having the hot water supply pipe 10 including the pipe portion 10b and the nozzle portion 10c having the above-described configuration, the hot water supply device is arranged so as to satisfy the above arrangement conditions, thereby performing hot water supply. The occurrence of entrainment and turbulent flow can be prevented, and as a result, the quality of the die cast product can be prevented from deteriorating.

In the present embodiment, the cross-sectional shape of the pipe portion 10b, the inclination of the pipe section 10b (corresponding to the corner alpha ₁ in FIG. 2) is a circle equivalent diameter of the cross-sectional area of the magnesium melt flowing through the inside of the pipe portion 10b It is preferable to adjust so that the product r × v of r (mm) and the flow velocity v (mm / s) is within 2000, for example. This is the Reynolds number Re = r × v / ν (ν (mm ² / s) is the kinematic viscosity coefficient of the molten metal), and the kinematic viscosity coefficient of the magnesium molten metal 8a is 1.2 or less. In order to realize a laminar flow state, r × v <2000 is adjusted. Similarly, the inclination of the cross-sectional shape and the nozzle portion 10c of the nozzle portion 10c regard to (corresponding to the corner alpha ₂ in FIG. 2), circle equivalent diameter of the cross-sectional area of the molten magnesium 8a flowing through the interior of the nozzle portion 10c r ( mm) and the flow velocity v (mm / s) is preferably adjusted so that the product r × v is within 2000. The product r × v is not limited to a value of 2000, and an optimal value may be set as appropriate depending on the type of molten metal. Furthermore, it is preferable to adjust the cross-sectional shape of the nozzle part 10c and the inclination of the nozzle part 10c so that the amount of hot water supplied to the die casting sleeve 20 is 1 to 2 kg / s.

It is a figure which shows schematic structure of a general hot water supply apparatus. It is sectional drawing which shows the structure of the nozzle part vicinity in the hot water supply state to the die-casting sleeve by the hot water supply apparatus in one Embodiment of this invention. It is a top view which shows the structure of the nozzle part vicinity in the state of FIG. FIG. 4A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4A shows a case where the cross section of the pipe portion is elliptical, and FIG. 4B shows a case where the pipe portion is trapezoidal. FIG. 5B is a cross-sectional view taken along the line B-B in FIG. 2, and FIG. 5A illustrates an example of a cross-sectional shape of the rectifying unit when the nozzle section has an elliptical cross section and FIG. 5B illustrates a trapezoidal shape. FIG. 6B is a cross-sectional view taken along the line B-B of FIG. 2, and FIG. 6A illustrates another example of the cross-sectional shape of the rectifying unit when the nozzle section has an elliptical cross section and FIG. 6B illustrates a trapezoidal shape.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus, 2 Melting pan, 3 Melting furnace, 4 Cover body, 5 Injection sleeve, 6 Injection piston, 7 Suction valve, 8, 8a Magnesium molten metal, 9 Introducing pipe, 10 Hot-water supply pipe, 10a Opening part, 10b Pipe part, 10c Nozzle part, 10d Hot water inlet, 11 Injection cylinder, 12 Piston rod, 13 Rectifying means, 13a Slit, 14 Guide means, 15 Heating means, 16 Valve cylinder, 17 Valve rod, 18 Heater, 20 Die-casting sleeve, 20a Opening part ( Die-casting sleeve), 21 Die-casting piston, P Pipe center axis, Q Nozzle center axis, R Die-casting sleeve center axis.

Claims (9)

In the hot water supply apparatus for supplying the molten metal in the melting furnace to the outside of the melting furnace through a hot water supply pipe communicating from the inside of the melting furnace to the outside,
The hot water pipe is
A pipe portion through which the molten metal from the melting furnace passes, and
A nozzle part that is provided at the tip of the pipe part and discharges the molten metal that has passed through the pipe part from the melting furnace;
Including
The nozzle part is provided at the tip of the pipe part in a state where the central axis of the nozzle part is inclined with respect to the central axis of the pipe part when the pipe part and the nozzle part are projected onto a vertical plane. ,
A water heater characterized by that. The hot water supply apparatus according to claim 1,
The nozzle part is
In a state where the central axis of the nozzle part when the pipe part and the nozzle part are projected on a horizontal plane is inclined at an angle of 30 ° or less with respect to the central axis of the pipe part, the nozzle part is the tip of the pipe part Provided in the
A water heater characterized by that. The hot water supply apparatus according to claim 1 or 2,
The hot water supply apparatus characterized in that the cross-sectional shape of the pipe portion and the cross-sectional shape of the nozzle portion in the vicinity of the connection portion with the nozzle portion are substantially elliptical shapes having long axes arranged in the horizontal direction. The hot water supply apparatus according to claim 1 or 2,
The cross-sectional shape of the pipe portion and the cross-sectional shape of the nozzle portion in the vicinity of the connection portion with the nozzle portion are substantially trapezoidal shapes where the lower side is wider than the upper side.
A water heater characterized by that. The hot water supply apparatus according to claim 3 or 4,
The cross-sectional shape of the nozzle part is adjusted so that the amount of molten metal supplied from the nozzle part is 1 to 2 kg / s.
A water heater characterized by that. In the hot water supply device according to any one of claims 1 to 5,
The inclination angle of the nozzle part with respect to the pipe part is adjusted so that the supply amount of the molten metal from the nozzle part is 1 to 2 kg / s.
A water heater characterized by that. The hot water supply apparatus according to any one of claims 1 to 6,
The nozzle unit includes therein a rectifying unit that makes a molten metal flow into a laminar state. In the hot water supply device according to any one of claims 1 to 7,
The nozzle portion includes a guide means for suppressing a flow rate of the molten metal discharged from the tip opening of the nozzle portion and gently flowing the molten metal downward from the tip opening.
A water heater characterized by that. A hot water supply method using the hot water supply device according to any one of claims 1 to 8 to supply molten metal in a melting furnace to a die casting sleeve,
When the nozzle part and the die-casting sleeve are projected onto a horizontal plane, the nozzle part is placed on the die-casting sleeve so that the central axis of the nozzle part is inclined at an angle of 30 ° or less with respect to the central axis of the die-casting sleeve. The molten metal is supplied in a state where the drop height from the nozzle part to the die-casting sleeve is as low as possible.
A hot water supply method characterized by that.

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