JP2017177130A - Gutter for high temperature fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new and improved gutter which enables control of a temperature of a molten metal when the molten metal or the like is supplied.SOLUTION: A gutter includes at least a gutter body including: a groove shaped heat conductor in which an upper surface opens; and a heating element attached to an outer peripheral end part of the heat conductor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-temperature fluid scissor.

  When supplying molten metal from a molten metal tank to a die casting sleeve or a gravity casting mold, for example, an electromagnetic pump is used.

  And, when supplying molten metal from a nozzle of an electromagnetic pump to a gate such as a die-cast sleeve, a scissor may be used (for example, Patent Document 1). Ceramics such as a calcium silicate molded body, a bent steel plate, and the like are used for this bag.

Japanese Unexamined Patent Publication No. 7-100600

  However, in the case of using a long tub bent from a steel plate, the molten metal passes through the tub during hot water supply, so that the tub itself deforms like a bimetal due to thermal expansion every time the molten metal passes, and the spout warps up. In some cases, it may not be possible to enter the gate of the die-cast sleeve. Furthermore, before the hot water is supplied to the die-cast sleeve or the like, the temperature of the molten metal is lowered, and solidified pieces may be formed in the molten metal. Due to the presence of the solidified pieces, there is a problem in casting in the die casting sleeve or gravity casting mold, and it may be difficult to maintain the quality of the manufactured product.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to raise the temperature of the soot when supplying molten metal or the like to a temperature close to the temperature of molten metal or the like. It is to warm up. Here, the temperature of the soot is raised to a temperature higher than the solid phase temperature of the molten metal or the like, preferably higher than the liquid phase temperature of the molten metal or the like. It is an object of the present invention to provide a new and improved method for controlling the temperature of a soot and a soot capable of freely controlling the soot temperature in order to prevent the molten metal from containing solidified pieces. In particular, when the operation of an electromagnetic pump or the like is stopped for 2 hours or more, the molten metal adhering to the soot may oxidize. Therefore, by lowering the molten metal adhering to the soot once below the solid phase temperature, It is an object of the present invention to provide a novel and improved soot and soot temperature control method capable of controlling the temperature so that a strip-like solidification zone can be formed immediately and a strip-like solidification zone containing a large amount of oxide can be obtained immediately.

  In order to solve the above-described problems, according to one aspect of the present invention, a bag body including a groove-shaped metal plate good heat conductor having an open upper surface, and both sides of an outer peripheral end of the good heat conductor are provided. There is provided a bag having at least a heating element.

  In order to solve the above-described problem, according to another aspect of the present invention, a bag main body including a groove-type heat conductor having an open top surface, an outer side surface of the heat conductor, and the side surface There is provided a scissor comprising at least a heating element attached to a height at a substantially intermediate position.

  It is preferable to further include a heat insulating material that covers at least a part of the outer peripheral portion of the bag main body and the heating element.

  It is preferable to further include a ceramic coating film that covers at least a portion of the inner periphery of the good heat conductor through which hot water flows.

The average linear expansion coefficient at 0 ° C. to 650 ° C. of the good heat conductor, preferably a ^{11.0 (× 10 -6 /℃)~13.5(×10 -6 /} ℃).

  The good heat conductor is preferably ferritic stainless steel and has a thermal conductivity of 25 w / mk to 27.2 w / mk.

  The heating element is preferably a sheathed heater.

  Moreover, in order to solve the said subject, according to another viewpoint of this invention, the ridge body containing the groove-shaped metal plate good heat conductor which the upper surface opened, and the outer periphery edge part of the said good heat conductor A heating element attached to both sides, and a preheater that can be preheated with at least a preheating method to control the heat generation of the heating element and preheat above the liquid phase temperature of the molten metal flowing through the firewood, preferably preheated to the same temperature as the hot water In addition, the temperature of the tub is controlled to a uniform predetermined temperature to prevent the deformation (warping) of the tub when the hot water flows into the tub, and to provide a tub that prevents a decrease in the hot water temperature and solidification of the molten metal.

  It further includes a heat conductor temperature measurement sensor such as a thermocouple for measuring the surface temperature of the good heat conductor, and the heat generation control controls the heat generation of the heat generator based on the measurement result by the heat conductor temperature measurement sensor. It is preferable to include a heat generation control device.

  It further includes a melting point comparison control device for comparing the measurement result by the thermal conductor temperature measurement sensor and the melting point of the liquid flowing to the basket, and the heat generation control is based on the comparison result with the set temperature equal to or higher than the melting point. It is preferable to include a heat generation control device that controls the heat generation of the heat generator.

  A liquid temperature measurement sensor for measuring the temperature of the liquid; a measurement result by the thermal conductor temperature measurement; and a liquid temperature comparison control device for comparing the measurement result by the liquid temperature measurement sensor, wherein the heat generation control includes It is preferable to include a heat generation control device that controls the heat generation of the heating element to a set temperature equal to or higher than the liquid phase temperature of the aluminum alloy based on the liquid temperature measurement result.

  As described above, according to the present invention, the hot metal temperature can be controlled when supplying molten metal or the like, and the metal slag is easy to heat and has a uniform temperature. Since the bend does not bend even when it flows, it provides a new and improved dredge that can reliably supply hot water at a specified position, has little drop in the temperature of molten metal, etc., and does not solidify the molten metal adhering to the pot. can do. In particular, when the electromagnetic pump is shut down for more than 2 hours, the molten metal attached to the soot oxidizes, so the molten metal attached to the soot is once lowered below the solid phase temperature to form a band-like solidification zone at the bottom of the soot. It is possible to provide a new and improved soot and a soot temperature control method capable of controlling the temperature so as to immediately take a strip-like solidification zone containing a large amount of.

It is a perspective schematic diagram which shows the internal basic composition except the heat insulating material of the aluminum hot water supply trough of 1st Embodiment. It is a perspective schematic diagram which shows the basic composition of the aluminum hot water supply trough of 1st Embodiment. It is a cross-sectional schematic diagram which shows the modification of the aluminum hot water supply trough of 1st Embodiment. It is a cross-sectional schematic diagram of the aluminum hot water supply trough of the second embodiment. It is a cross-sectional schematic diagram of the aluminum hot water supply trough of the third embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially the same function structure, duplication description may be abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the embodiment described below, a case will be described in which the iron of this embodiment is applied when a molten aluminum alloy is supplied from a molten metal holding tank to a sleeve of a die casting machine. In addition, this embodiment is not limited to such a case, It can apply to the hot water supply of high temperature fluids, such as molten metals, such as aluminum, zinc, magnesium, or these alloys. However, magnesium alloy is easy to oxidize, so the top of the jar has a lid, and the throat spout and sleeve opening must also be sealed so that the atmosphere does not enter, and the inner surfaces of both lids are inert. It is necessary to devise a way to avoid molten metal oxidation by allowing gas to flow. Moreover, the bag of this embodiment can be applied not only to a metal but also to a bottle of a liquid that does not want to solidify until it is put into a storage container, such as paraffin. However, in the case of paraffin, the stainless steel is not corroded, so a ceramic coating is not necessary.

<First Embodiment>
A first embodiment of the present invention will be described. The aluminum alloy hot water supply rod 10 of the first embodiment shown in FIG. 1 includes at least a rod body 100 and a heating element 150. First, an internal basic configuration excluding the heat insulating material 200 will be described.

(樋 body 100)
The bag main body 100 includes a groove-type heat conductor 101 whose upper surface is open. The groove shape has a substantially semicircular arc, U-shape, inverted U-shape, V-shape, inverted trapezoidal shape, etc., and has a groove shape. The scissors main body 100 includes a rib portion 102 for attaching the scissors 10 so as to be placed under a nozzle outlet of an aluminum alloy hot water pump (not shown), for example, and a rib portion 102, and the outlet of the pump nozzle of the scissors 10 In order to easily and securely fix the lower portion, the rib portion 102 is provided with a projection portion 103 to be inserted into a hole provided in the mounting base of the pump. Further, the heating element 150 is securely attached to the heat conductor 101, and is provided with a flange 104 that improves the thermal conductivity by contacting the heating element 150. The collar portion 104 also serves as a reinforcing plate that prevents lateral deflection and bending of the collar body 100. The heat conductor 101, rib 102, protrusion 103, and collar 104 of the collar body 100 may be integrally molded by bending a plate, or each part is assembled by welding or the like. It may be. For example, the heat conductor 101, the rib part 102, the protrusion part 103, and the collar part 104 can be integrally molded to form the collar body 100 by pressing, bending, or cutting a plate having a thickness of 2 mm. .

The average linear expansion coefficient at 0 ° C. to 650 ° C. of the thermal conductor 101 may be a ^{11.0 (× 10 -6 /℃)~13.5(×10 -6 /} ℃). The average linear expansion coefficient is preferably 12.5 (× 10 ⁻⁶ / ° C.) or less, more preferably 11.0 (× 10 ⁻⁶ / ° C.) or less. Since the temperature of the molten aluminum alloy is around 700 ° C., if the molten aluminum flows through the bowl 10 without preheating the bowl body 100, the heat conductor 101 in the portion where the molten metal has flowed is heated and expanded, and above and below the bowl. There is a case where a so-called bimetal effect that a distortion occurs and an abrupt warpage occurs is increased. The average linear expansion coefficient of the average linear expansion coefficient is larger austenitic stainless steel becomes ^{18.0 (× 10 -6 /℃)~19.3(×10 -6 /} ℃), by the bimetal effect is increased, When the molten aluminum alloy is poured into the sleeve, it strikes the sleeve opening due to a sudden warp of the heat conductor 101 and scatters. Furthermore, since there is a gap in the thermal expansion coefficient with the ceramic coating film described later, cracks occur in the ceramic coating film. Further, when the average linear expansion coefficient is smaller than 12.5 (× 10 ⁻⁶ / ° C.), if the pre-heating is not more than the liquidus, the position of the spout at the spout outlet due to the bimetal effect may change. There is no problem that hot water hits the thick-walled portion and splashes (hot water hits the sleeve opening and splashes), but it is not suitable as the bag 10 in terms of workability, durability, strength or weight. There is a case. If the average linear expansion coefficient is 12.5 (× 10 ⁻⁶ / ° C.) or less and the liquid phase temperature of the molten metal or higher, rapid warping of the heat conductor 101 can be suppressed, and thus the molten aluminum is prevented from scattering. be able to.

Specifically, when the amount of warp warp is described, in the case of an austenitic stainless steel rod having an average linear expansion coefficient of 18.0 (× 10 ⁻⁶ / ° C.) having a length of 1 m and a depth of 10 cm, the depth of the rod If there is a difference of 100 ° C. (when the liquid phase temperature is 600 ° C. and a molten metal of 700 ° C. flows), there is a warp of 10 mm. On the other hand, in the case of ferritic stainless steel irons having the same dimensions and an average linear expansion coefficient of 12.5 (× 10 ⁻⁶ / ° C.), if there is a difference of 100 ° C. in the depth of the iron (liquidus temperature is 600 ° C. Then, when a 700 ° C. molten metal flows), there is a 6 mm warp. Although the size of the opening of the sleeve is relatively small and can be warped to some extent by experiments, the above problem has been solved by using a ferritic stainless steel plate.

Examples of the material that satisfies the condition that the average linear expansion coefficient is 12.5 (× 10 ⁻⁶ / ° C.) or less include ferritic stainless steel, martensitic stainless steel, precipitation hardening stainless steel, and iron. Any of the above materials other than iron that has a significantly oxidized surface at a high temperature exceeding 600 ° C. is suitable as the cage 10 of the present invention. In particular, a ferritic stainless steel containing 17% by mass or more of Cr and a precipitation hardening system. Stainless steel is less fermented at high temperature, and the heat conductor 101 is preferably ferritic stainless steel having a high thermal conductivity. Even if the ferritic stainless steel containing 17 mass% or more of Cr is heated to a high temperature of 600 ° C. or higher, the oxide film does not increase and the surface becomes tattered and does not peel off. In addition, since ferritic stainless steel has a small thermal expansion coefficient and the surface oxide film is dense and cannot be peeled off, it is excellent in adhesion to the ceramic coating film described later, and therefore, the use of the heel 10 prevents the ceramic coating film from peeling off. be able to.

(Heating element 150)
Since the heating element 150 is provided on both sides of the heat conductor 101, the heat of the heating element 150 is transmitted to the heat conductor 101, so that the entire heat conductor 101 can be warmed. Therefore, when the molten aluminum is supplied, it is possible to prevent or suppress the temperature of the molten aluminum from being lowered by the rod 10. When the groove-shaped heat conductor 101 having an open top surface is used without a lid, heat dissipation from the opening is large, and there is a case where the temperature difference between the top and bottom in the depth direction of the ridge is generated, so that the temperature may not be equalized. It is preferable to attach the heating element 150 to a height at an intermediate position of the depth of the ridge. For example, the heating element 150 can be mounted at a height above the position where the ceramic coating film 160 is coated and at an intermediate position of the depth of the ridge. By attaching to the position above the ceramic coating film 160 through which the molten aluminum flows in this way, even if the heat conductor 101 is deficient due to the molten aluminum, a short circuit can be prevented. Thus, if the heat conductor 101 is suitably preheated, it is possible to prevent or suppress the occurrence of warpage that occurs when the molten aluminum flows. In many cases, there is no lid on the operation, and the heating element 150 can be flattened and installed so that the flattened surface is pressed against the heat conductor 101 surface of the bag.

  When a lid is attached to the opening of the heel and the depth is shallower than the width of the opening of the heel, the heating element 150 is attached to the outer peripheral end portion 105 (the bent rib portion in FIG. 1) of the heat conductor 101. Also good. If it is the outer periphery edge part 105, the attachment or fixation to the heat conductor 101 of the heat generating body 150 is easy. Since the heating element 150 is provided at both ends of the outer peripheral end portion 105 of the thermal conductor 101, the thermal conductor 101 can be uniformly warmed, and a thermal gradient is generated vertically in the depth direction of the ridge. Since it can suppress, it is more preferable. Furthermore, the heating element 150 is more preferable because it is provided in the longitudinal direction of the heat conductor 101 so that the heat conductor 101 can be uniformly warmed and a thermal gradient can be suppressed. As described above, when the groove-type heat conductor 101 having an open upper surface is used without a lid, the heat radiation from the opening is large, so that a temperature difference between the upper and lower depth direction of the ridge is generated and the temperature is equalized. Therefore, it is preferable to attach the heating element 150 to a height at an intermediate position of the depth of the ridge.

  Furthermore, although the heat generating body 150 can be attached to portions other than the outer peripheral end portion 105 of the heat conductor 101, it is particularly preferable for attachment only to the outer peripheral end portion 105. When the depth of the soot is shallow, if the heating element 150 is attached only to the outer peripheral end portion 105, even if the molten metal flow portion 106 of the soot 10 is melted by the molten aluminum, the heating element 150 has a molten aluminum. Will not be applied. Therefore, for example, a failure such as electric leakage of the heating element 150 can be prevented.

  The heating element 150 is not particularly limited as long as it generates heat. For example, a heater such as a quartz tube heater, a sheathed heater, or a mica heater can be used. In particular, a sheathed heater is more preferable because it has a long life. A sheathed heater is, for example, a resistance heating element such as a heating wire (such as nichrome wire) inserted into a metal pipe excellent in oxidation resistance at a high temperature such as stainless steel, and an insulator such as insulating powder such as magnesia in the metal pipe. Is solidly filled, and thus has a longer life than other heaters.

  When a sheathed heater is used as the heating element 150, the heater lead 151 can be provided as a non-heating part, so that the heat dissipation of the heater itself can be prevented.

  Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic perspective view showing a basic configuration of the aluminum hot water supply trough 11 according to the first embodiment including the heat insulating material 200. The heat insulating material 200 covers at least a part of the outer peripheral portion of the bag main body 100 and the heating element 150. Since the heat insulating material 200 covers the outer periphery of the cocoon body 100, heat dissipation from the cocoon body 100 can be suppressed, and further, the generation of a temperature gradient in the cocoon body 100 is suppressed, and the temperature of the cocoon body 100 is made uniform. Can be Further, if the heat insulating material 200 covers the entire outer periphery of the heating element 150, heat conduction to the heat conductor 101 becomes difficult. Therefore, it is preferable to cover the outer periphery of the heating element 150 except for the vicinity of the outer peripheral end portion 105 where the heating element 150 conducts heat to the thermal conductor 101. Since the heat insulating material 200 covers the heating element 150 in this manner, heat radiation from the heating element 150 can be suppressed.

  The heat insulating material 200 is not particularly limited as long as it reduces heat transfer and / or heat transfer. As the heat insulating material 200 for high temperature, for example, a fiber heat insulating material, a foam heat insulating material, or the like can be used. Examples of the fiber heat insulating material include glass wool and rock wool. Moreover, fumed silica etc. can be mentioned as another heat insulating material.

(Method of applying ceramic coating film 160)
The metal rod 10 is preferably provided with a ceramic coating film 160 in order to prevent melting of the portion of the inner periphery of the heat conductor 101 where the molten aluminum alloy flows. When the metal made of the heat conductor 101 is used, the molten aluminum alloy may cause an alloy of the aluminum alloy and the metal material of the heat conductor 101 to be formed and melted in the molten metal flow portion 106. Usually, in aluminum, an alloy having a composition close to 100% aluminum relative to a metal material (for example, ferritic stainless steel) results in an eutectic point alloy lower than the melting point of aluminum. Therefore, when the molten aluminum flows, alloying of the molten metal flow portion 106 proceeds and the molten metal flow portion 106 is gradually lost. Since at least a portion where the molten aluminum flows is covered with the ceramic coating film 160, melting damage due to alloying can be prevented, and loss of the heat conductor 101 can be prevented.

  The ceramic coating film 160 can be formed by applying a ceramic coating agent to the heat conductor 101 or the like. As the ceramic coating material, a coating agent such as a coating agent suitable for an iron mold can be used. For example, a coating agent using a nitride coating agent such as Ti or B containing a bonding agent such as alumina sol or water glass, a zircon containing a bonding agent such as alumina sol or water glass, or an aggregate such as alumina or aluminum titanate. If there is, the adhesion with ferritic stainless steel whose thermal expansion coefficient is about iron is excellent, and it does not differ greatly from the average linear expansion coefficient of ferritic stainless steel. This can prevent the ceramic coating film from peeling off. In particular, the oxide on the surface of the ferritic stainless steel is dense and has no peeling, and its oxidized surface is tattered and does not peel off. Therefore, these ceramic coating agents do not peel from the surface of the ferritic stainless steel.

  When the ceramic coating agent is applied to the heat conductor 101, it is preferable that the surface of the application target portion of the heat conductor 101 is sandblasted so as to have a predetermined roughness. This is because the adhesion between the heat conductor 101 and the ceramic coating film 160 is improved. The surface roughness is made smaller than the film thickness of the ceramic coating film 160. That is, by “the film thickness of the ceramic coating film 160> the maximum height roughness (Rz) of the portion to be applied”, “the arithmetic average roughness Ra within 1 μm to 4.0 μm” and “Rz within 22 μm” The coating unevenness can be eliminated, and the occurrence of defective portions not coated with the ceramic coating agent and the peeling of the film due to the generation of bubbles during the coating can be prevented. In particular, when Rz exceeds 22 μm, the ceramic coating agent does not enter the concave surface because it is too rough, and it becomes difficult to uniformly apply the ceramic coating agent. Furthermore, Ra is preferably coated on the surface of 1.0 μm to 4.0, and if possible, Ra should be uniform.

[Temperature control method]
Next, a temperature control method for the bag of the first embodiment described above will be described.

(Heat generation control method)
The temperature control method of the ridge 10 controls the heat generation of the heating element 150 based on a temperature signal of a sheathed thermocouple or the like attached to the outer surface of the ridge 10. When a sheathed heater is used as the heating element 150, for example, the heat generation of the sheathed heater can be controlled by appropriately turning on or off the power supply to the sheathed heater with a non-contact relay (not shown). An on / off control unit (not shown) can generally perform automatic PID control. It is better to use SCR phase control that is costly but has better temperature stability than on / off control. Either method may be used, but if the temperature of the soot is preheated to a temperature higher than the liquid phase temperature of the aluminum alloy by controlling the heat generation of the heating element 150, the temperature of the molten aluminum flowing through the soot 10 can be prevented from being lowered and solidified pieces being generated It is possible to prevent problems that may occur in casting in a die casting sleeve or gravity casting die that is a subsequent process, and to maintain the stability of the quality of the manufactured product. The problem of deformation due to the bimetal effect of the cocoon can be prevented and the rapid warping of the heat conductor 101 can be suppressed, so that the molten aluminum does not hit the wall of the spout of the sleeve opening, and the scattered molten aluminum can be prevented. .

(Thermal conductor temperature measurement method)
For the temperature control method of the bag, a thermal conductor temperature measurement sensor such as a sheathed thermocouple that measures the surface temperature of the thermal conductor 101 can be used. The surface temperature of the heat conductor 101 is actually measured, and the heat conductor 101 is heated to a predetermined temperature by performing feedback control (temperature control) on the heat generation of the heat generator 150 based on the measurement result.

  The measurement of the surface temperature of the heat conductor 101 and the control of the temperature of the heating element 150 are performed by, for example, measuring the surface temperature of the heat conductor 101 using a thermometer such as a sheath type thermocouple, and applying it to the sheathed heater based on the measurement result. Power generation can be controlled to a predetermined temperature by controlling the heat generation of the sheathed heater by on / off control or SCR phase control by a non-contact relay (not shown). Further, for example, a temperature sensor (not shown) and a control unit (not shown) that controls the heat generation of the heat conductor 101 based on the measurement result by the temperature sensor can be automatically controlled.

(Temperature control above the liquidus line of cocoon)
The temperature control method of the soot without a decrease in the hot water supply temperature further includes a comparator for comparing the measurement result by the thermal conductor temperature measuring sensor with the temperature sensor for measuring the temperature of the molten aluminum in the holding furnace flowing to the soot 10. It is important. The actual value of the surface temperature of the heat conductor 101 is measured, and based on the result of comparison of the measurement result with the liquidus temperature of the molten aluminum alloy (for example, around 600 ° C. in the case of ADC12) Control (heat generation control stage) can be performed. As a result, the temperature difference between the surface temperature and the melting point of the heat conductor 101 can be minimized, and more precise heat generation control can be performed, and the cost for heat generation of the heat generator 150 can be further reduced.

  The comparison between the temperature of the molten metal in the holding furnace and the temperature of the soot and the control of the heat generation of the heating element 150 are performed by, for example, measuring the surface temperature of the heat conductor 101 and turning on the switch (not shown) of the sheathed heater in comparison with the melting point. Alternatively, it can be carried out by manually turning off as appropriate. In addition, for example, it can be automatically controlled by a control unit (not shown) that controls the heat generation of the heating element 150 using, for example, a threshold value of a predetermined temperature difference as a guide as compared with a measurement result by a temperature sensor of the holding furnace.

  FIG. 3 is a schematic cross-sectional view showing a modification of the aluminum hot water supply trough 11 of the first embodiment. The cross section cut | disconnected by the A-A 'line | wire in FIG. 2 is shown. FIG. 3A includes a restraining plate 170 that restrains the heating element 150 and holds it on the outer peripheral end portion 105 of the heat conductor 101. By providing the holding plate 170, it is possible to ensure the stability of the attachment of the heating element 150.

  There is no particular limitation on the material of the suppression plate 170, and any material can be used as long as it has heat resistance that can withstand the heat generated by the heat generator 150 and can suppress the heat generator 150. In particular, a material having thermal conductivity is preferable, and the same material as the thermal conductor 101 is preferable. For example, if both the heat conductor 101 and the restraining plate 170 are ferritic stainless steel, the entire outer periphery of the heating element 150 can be covered with the ferritic stainless steel. In this case, the heat conduction efficiency transmitted from the heating element 150 to the heat conductor 101 can be improved.

  The holding plate 170 can be fixed to the heel body 100 by being fixed to the rib portion 102 and / or the flange portion 104 and also to the outer periphery 107 of the heat conductor 101. Further, as shown in FIG. 3B, the restraining plate 170 can be fixed to the collar rib 108 obtained by further bending the collar 104.

  Further, the holding plate 170 may be integrally formed with the rib portion 102 and / or the flange portion 104. For example, the heat conductor 101, the rib portion 102, the protrusion 103, the flange portion 104, and the holding plate 170 may be integrally formed into a bag body 100 by pressing or cutting a plate having a thickness of 2 mm. it can.

  Further, in the scissors of the present invention, in the scissors 11a of FIG. 3 (a), the cross-sectional shape of the molten metal flow portion 106 is V-shaped, but the scissors 11b of FIG. 3 (b) and the scissors 11c of FIG. In this manner, the bottom surface 109 may be formed in a trapezoidal cross section.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 4 is a schematic cross-sectional view of the aluminum hot water scissor 12 of the second embodiment. The second embodiment is different from the first embodiment in that a heating element 152 having a flat cross section is provided. If the heating element 152 has a flat cross section, the contact area with the heat conductor 101 is increased, so that the efficiency of heat conduction to the heat conductor 101 can be further improved.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 5 is a schematic cross-sectional view of the aluminum hot water scissor 13 of the third embodiment. The third embodiment is different from the first embodiment in that the cross-sectional shape of the heat conductor 101 is a substantially semicircular arc and includes a circular cross-section holding plate 172 formed integrally with the heat conductor 101. Since the holding plate 172 is integrally formed with the heat conductor 101 and has a round cross section, a contact area between the heating element 150 having a round cross section and the holding plate 172 becomes large. The heat conduction efficiency can be further improved.

<Summary>
As described above, with the structures of the scissors 10 to 13 and the scissors of the present invention, it is possible to prevent a drop in hot water temperature when supplying molten aluminum, prevent formation of solidified pieces in the scissors, and reduce deformation of the scissors themselves. The molten metal from the hot water supply device can be reliably supplied to the pouring port of the sleeve of the die casting machine, preventing problems that may occur during casting in the die casting sleeve and gravity casting mold, and stabilizing the quality of manufactured products. Can be maintained.

  Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10, 11, 12, 13 １００ 100 樋 Main body 101 Thermal conductor 102 Rib portion 103 Protrusion portion 104 庇 portion 105 Outer peripheral end portion 106 Melt flow portion 107 Outer periphery 108 butt portion rib 109 Bottom portion 150, 152 Heating element 151 Heater lead portion 160 Ceramic coating film 170, 171, 172 Restraining plate 200 Heat insulating material

Claims (8)

A cocoon body including a groove-type heat conductor whose upper surface is open,
And a heating element attached to the outer peripheral ends of both sides of the heat conductor. A cocoon body including a groove-type heat conductor whose upper surface is open,
A heating element provided at least on the outside of the side surface of the heat conductor and attached to the height of a substantially intermediate position of the side surface.   The scissors according to claim 1 or 2, further comprising a heat insulating material that covers at least a part of both outer peripheral portions of the scissors main body and the heating element.   The scissors according to any one of claims 1 to 3, further comprising a ceramic coating film covering at least a part of an inner peripheral portion of the heat conductor. The average linear expansion coefficient at 0 ° C. to 650 ° C. of the heat conductor is ^{11.0 (× 10 -6 /℃)~13.5(×10 -6 /} ℃), any of claims 1 to 4 The sputum according to item 1.   The bag according to claim 1, wherein the heat conductor is ferritic stainless steel.   The bag according to any one of claims 1 to 6, wherein the heating element is a sheathed heater.   The said heat generating body is a scissors of any one of Claims 1-7 whose cross section is flat shape.

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