JP2008114235A - Die casting apparatus, sleeve, chill vent, and die casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeve which can suppress the generation of defective products caused by the intrusion of gas and air into molten metal, and can improve a yielding ratio using inexpensive facilities. <P>SOLUTION: In the sleeve, a degassing groove 25 to be communicated with a molten metal pouring port 22 is formed on part of the inner wall surface 27 composing the internal space 28 of a sleeve body 21 having a molten metal pouring port 22 into which molten metal 80 is poured and a molten metal pushing-out port 23 which is opened at the tip end thereof, and pushes out the molten metal 80 therefrom. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a die casting technique using a metal such as an aluminum alloy, and more particularly to a die casting apparatus, a sleeve, a chill vent and a die casting method used for die casting of an aluminum alloy, a zinc alloy, a magnesium alloy or a copper alloy. .

  The die-casting method is a casting method in which a sleeve having a molten metal injection port is attached to a mold, molten metal is injected into the sleeve from the molten metal injection port, and the molten metal in the sleeve is press-fitted into the mold with a plunger.

  When the molten metal is supplied into the sleeve from the molten metal inlet, the molten metal is normally supplied so as to have a filling rate of about 20% to 60% of the volume of the internal space in the sleeve. For this reason, when the molten metal in the sleeve is pressed into the mold with a plunger, air occupying about 40% to 80% of the volume of the internal space in the sleeve is also pressed into the mold. Air may remain and cause product defects.

  On the other hand, a vacuum die casting method in which a molten metal is press-fitted after a mold is evacuated using a vacuum pump is known. However, the vacuum die casting method has a problem in that although the cost of equipment such as a vacuum pump is high, the yield is poor and the effect of suppressing product defects is not sufficient.

  With respect to the die casting apparatus, a die casting process in which a static magnetic field generating means for generating a static magnetic field in an internal space such as a cavity of the die casting apparatus and the outside air is arranged in Patent Document 1 (Japanese Patent Laid-Open No. 2006-239766). An apparatus is disclosed.

  According to the die-casting apparatus disclosed in Patent Literature 1, the blow-out of the molten metal is suppressed by suppressing the intrusion of air into the cavity using the pseudo buoyancy generated in the air and decelerating the flow of the molten metal. It is possible to cast a product that is free of casting defects such as gas nests.

However, since the die-casting apparatus disclosed in Patent Document 1 is provided with a static magnetic field generating means, the apparatus is expensive, and the suppression of air intrusion into the cavity is not sufficient.
JP 2006-239766 A

  The present invention provides a die-casting apparatus, a sleeve, a chill vent, and a die-casting method that can suppress the occurrence of product defects due to gas and air mixing into molten metal and improve the yield with low-cost equipment. With the goal.

  A die-casting apparatus according to the present invention solves the above-described problem, and cooperates with a plunger sliding in an internal space to push a molten metal into a molten metal inlet of the mold, In a die casting apparatus provided with a chill vent for venting the gas in the cavity, provided in a mold gas vent on the tip end side of the cavity, the sleeve opens at the tip and a metal inlet into which the molten metal is poured. A gas vent groove leading to the molten metal inlet is formed in a part of the inner wall surface of the sleeve body having a molten metal extrusion port for extruding the molten metal, and the chill vent is formed in the first chill vent member main body. When the first chill vent member in which one passage forming recess is engraved and the first chill vent member are combined, both ends open to the outside in cooperation with the first passage forming recess. The second passage forming recess that forms the gas cooling passage comprises a second chill vent member carved in the second chill vent member body, and the first and second chill vent members are respectively A high thermal conductive member made of a material having a higher thermal conductivity than the first and second chill vent member main bodies is embedded in the vicinity of the first and second passage forming recesses.

  The sleeve according to the present invention solves the above-mentioned problem, and constitutes an internal space of a sleeve body having a molten metal injection port into which a molten metal is injected and a molten metal extrusion port that opens at the tip and extrudes the molten metal. A degassing groove leading to the molten metal inlet is formed in a part of the inner wall surface.

  Furthermore, the chill vent according to the present invention solves the above-described problems, and includes a first chill vent member in which a first passage forming recess is formed in the first chill vent member main body, and the first chill vent member. When combined, the second passage forming recess that forms the gas cooling passage having both ends opened to the outside in cooperation with the first passage forming recess is engraved in the second chill vent member main body. The first and second chill vent members are higher in thermal conductivity than the first and second chill vent member bodies in the vicinity of the first and second passage forming recesses, respectively. A high heat conductive member made of a material is embedded.

  Moreover, the die-casting method according to the present invention solves the above-described problem, and has an inner space inside and an inner wall surface constituting the inner space of the sleeve having a molten metal injection port into which a molten metal is injected. A part is provided with a gas vent groove formed so as to communicate with the molten metal inlet, and the plunger is slid in the internal space and is compressed by the plunger when the molten metal is pushed out into the mold. Further, the gas in the inner space is extracted from the gas vent groove to the molten metal inlet.

  According to the die casting apparatus, the sleeve, the chill vent, and the die casting method according to the present invention, it is possible to suppress the occurrence of product defects due to mixing of gas or air into the molten metal and improve the yield with low-cost equipment. .

  Embodiments of a die casting apparatus, a sleeve and a chill vent according to the present invention will be described with reference to the accompanying drawings.

[Die-casting equipment]
FIG. 1 is a sectional view of a die casting apparatus according to the present invention.

  The die casting apparatus 1 includes a sleeve 20 that pushes the molten metal 80 into the molten metal inlet 14 of the mold 10, and a mold gas vent 17 on the distal end side of the cavity 15 of the mold 10. And a chill vent 40 for venting air.

  The die casting apparatus 1 is a casting apparatus that is used in an atmospheric release die casting method, and the sleeve 20 and the chill vent 40 are open to the atmosphere. In addition, the die-casting apparatus 1 can also be used with the vacuum die-casting method used under vacuum, using facilities, such as a vacuum pump. However, since the die casting apparatus 1 is difficult to mix gas into the molten metal 80 in the cavity 15, a product in which air and other gases remain in the product even in the open die casting method that does not use equipment such as a vacuum pump. Defects can be sufficiently suppressed and yield can be improved.

  As the molten metal 80, for example, an aluminum alloy, a zinc alloy, a magnesium alloy, or a copper alloy is used.

[sleeve]
The sleeve 20 will be described with reference to the drawings. FIG. 2 is a perspective view of the sleeve 20.

  The sleeve 20 is attached to the molten metal inlet 14 of the die 10 of the die casting apparatus 1 in cooperation with the plunger 30 that slides in the internal space 28, and pushes the molten metal 80 into the molten metal inlet 14. is there. The sleeve 20 is attached to the molten metal inlet 14 of the mold 10, for example, sideways.

  The sleeve 20 includes a sleeve main body 21. The sleeve body 21 includes an internal space 28 in which the plunger 30 slides, and is generally cylindrical.

  The plunger 30 includes a plunger head 31 and a plunger rod 32. The plunger 30 is a hydraulic cylinder (not shown) or the like, and drives the plunger rod 32 to push the plunger head 31 provided at the tip of the plunger rod 32 into the internal space 28 of the sleeve 20.

  The plunger 30 is inserted into the internal space 28 from the plunger insertion port 24 of the sleeve 20 and slides in the internal space 28.

  The sleeve main body 21 has a molten metal injection port 22 into which the molten metal 80 is poured and a molten metal extrusion port 23 that opens at the tip and pushes out the molten metal 80. Here, the tip of the sleeve 20 means a portion connected to the molten metal inlet 14 of the mold 10. The molten metal inlet 22 usually opens above the sleeve body 21.

  In the sleeve 20, a gas vent groove 25 communicating with the molten metal injection port 22 is formed in a part of an inner wall surface 27 constituting the internal space 28 of the sleeve body 21. The gas vent groove 25 is normally formed at the uppermost portion of the inner wall surface 27 that constitutes the internal space 28 of the sleeve body 21.

  Here, to communicate with the molten metal inlet 22 means that the end of the gas vent groove 25 is open to the molten metal inlet 22. For this reason, even when the plunger 30 slides in the internal space 28 and the plunger 30 occupies most of the cross section of the internal space 28, the gas vent groove 25 can always be ventilated to the molten metal inlet 22.

  The sleeve body 21 includes a low speed sliding portion L and a high speed sliding portion H. Here, the low-speed sliding portion L means a portion of the sleeve body 21 where the plunger 30 slides at a low speed in the Linda space 28. Further, the high speed sliding portion H means a portion of the sleeve body 21 where the plunger 30 slides at a high speed in the Linda space 28.

  Sliding the plunger 30 at a low speed in the low-speed sliding portion L is a preparatory operation for press-fitting the molten metal 80 in the internal space 28 into the mold 10, and the low-speed sliding portion L is a molten metal of the sleeve body 21. It is provided in the portion on the inlet 22 side.

  Sliding the plunger 30 at a high speed in the high-speed sliding portion H is an operation for press-fitting the molten metal 80 in the internal space 28 into the mold 10, and the high-speed sliding portion H is used to press the molten metal of the sleeve body 21. It is provided at a portion on the outlet 23 side.

  The gas vent groove 25 is formed in the low speed sliding portion L. The gas vent groove 25 does not need to be engraved in the entire length direction of the low-speed sliding portion L of the sleeve body 21 and may be engraved only in a part in the length direction.

  The cross-sectional shape of the gas vent groove 25 is not particularly limited, but is usually formed in a semicircular shape, a rectangular shape, or the like. Among these, the semicircular shape is preferable because the molten metal 80 is less likely to adhere and the gas vent groove 25 is clogged.

  The depth of the gas vent groove 25 from the inner wall surface 27 is preferable because the gas and air in the internal space 28 can be efficiently extracted as deep as the strength of the sleeve main body 21 (strength of surplus wall) is maintained.

The depth of the gas vent groove 25 from the inner wall surface 27 is usually 3 mm to 10 mm, preferably 4 mm to 7 mm, when the cross section of the gas vent groove 25 is semicircular. If the depth of the gas vent groove 25 is within this range, it is preferable because the gas and air in the internal space 28 can be extracted efficiently.

  The gas vent groove 25 is formed so that the thickness of the wall surface of the sleeve body 21 (thickness of the surplus wall) usually remains 10 mm or more in order to maintain the strength of the sleeve body 21.

  The ratio of the cross-sectional area of the gas vent groove 25 to the cross-sectional area of the internal space 28 is usually 1% to 10%, preferably 3% to 6%. It is preferable for the ratio of the cross-sectional area to be within this range because the gas and air in the internal space 28 can be extracted efficiently.

  The depth of the gas vent groove 25 is usually 10% to 50%, preferably 15% to 35% with respect to the thickness of the wall surface of the sleeve body 21 when the cross section of the gas vent groove 25 is semicircular. It is. It is preferable that the ratio of the depth of the gas vent groove 25 be within this range because the gas and air in the internal space 28 can be efficiently vented without reducing the strength of the sleeve body 21.

  The sleeve 20 may be provided at a place other than the uppermost portion of the inner wall surface 27 constituting the internal space 28 of the sleeve body 21 as long as the molten metal 80 does not flow backward when the plunger 30 is pushed.

  Further, a plurality of gas vent grooves 25 may be formed.

[Chill vent]
The chill vent 40 will be described with reference to the drawings. FIG. 3 is a perspective view of the chill vent 40.

  The chill vent 40 is attached to the mold gas vent 17 of the mold 10 of the die casting apparatus 1, and vents gas and air in the cavity 15 of the mold 10.

  The chill vent 40 includes a first chill vent member 41 in which a first passage forming recess 43 is formed in the first chill vent member main body 47 and a second passage formation recess 44 in the second chill vent member main body 48. The second chill vent member 42 is formed.

  When the first chill vent member 41 and the second chill vent member 42 are combined, the first passage forming recess 43 and the second passage forming recess 44 cooperate to open both ends 45 and 46 to the outside. The gas cooling passage 49 is formed.

  The shape of the gas cooling passage 49 is preferably a zigzag shape, but is not particularly limited, and may be a wave shape or the like.

  The interval between the gas cooling passages 49, that is, the minimum distance between the first passage forming recess 43 and the second passage forming recess 44 is usually 0.4 mm to 0.7 mm.

  Since the ordinary chill vent made entirely of steel has low cooling efficiency, the interval between the gas cooling passages is about 0.2 mm to 0.3 mm, and the gas generated from the mold 10 is difficult to be discharged. On the other hand, since the chill vent 40 has high cooling efficiency due to the high heat conducting members 55 and 56, the gap between the gas cooling passages 49 can be increased, and the gas generated from the mold 10 is discharged smoothly and smoothly.

  In the first chill vent member 41, a high heat conductive member 55 made of a material having a higher thermal conductivity than that of the first chill vent member main body 47 is embedded in the vicinity of the first passage forming recess 43.

  The high heat conduction member 55 has a flat plate shape on both surfaces, and is embedded in the high heat conduction member housing recess 51 recessed from the top of the first chill vent member main body 47.

  The high heat conducting member 55 is not a flat plate on both surfaces, and the surface on the first passage forming recess 43 side has the same shape as the first passage forming recess 43, for example, a staircase with a zigzag cross section. It may be a flat surface. When the high heat conduction member 55 is formed in this shape and the high heat conduction member 55 is embedded so that the surface on the first passage formation recess 43 side is parallel to the first passage formation recess 43, the cooling efficiency in the gas cooling passage 49 is increased. Can be improved.

  When the surface on the first passage forming recess 43 side of the high heat conduction member 55 is formed in the same shape as the first passage formation recess 43, the high heat conduction member housing recess 51 is recessed from the side surface of the first chill vent member main body 47. Then, the high heat conduction member 55 is inserted and embedded in the high heat conduction member housing recess 51 from the side surface of the first chill vent member main body 47.

  In addition to the surface on the first passage forming recess 43 side, the surface of the high heat conduction member 55 opposite to the first passage forming recess 43 has the same shape as that of the first passage forming recess 43, for example, a cross section. May be a stepped plane having a zigzag shape.

  When the high heat conduction member 55 is formed in this shape and the high heat conduction member 55 is embedded so that the surface on the first passage formation recess 43 side is parallel to the first passage formation recess 43, the cooling efficiency in the gas cooling passage 49 is increased. In addition to the improvement, the amount of material used on the surface opposite to the first passage forming recess 43, which is not very effective in cooling the gas cooling passage 49, can be reduced and the cost can be reduced.

  When both the first passage forming recess 43 side and the opposite surface of the high heat conducting member 55 have the same shape as the first passage forming recess 43, the high heat conducting member storage recess 51 is formed on the first chill vent member main body 47. The high heat conductive member 55 is inserted from the side surface of the first chill vent member main body 47 into the high heat conductive member housing concave portion 51 and buried therein.

  The high heat conductive member 55 is fixed in the high heat conductive member housing recess 51 with powder-containing silicon grease or the like. Here, the powder-containing silicon grease means a silicon grease containing at least one powder selected from diamond powder, silver powder, copper powder, alumina powder and the like.

  When the high heat conduction member 55 is fixed using the powder-containing silicon grease, the heat conduction between the high heat conduction member 55 and the first chill vent member main body 47 is high, and the cooling efficiency of the first chill vent member main body 47 is high. preferable.

  In the second chill vent member 42, a high heat conductive member 56 made of a material having a higher thermal conductivity than that of the second chill vent member main body 48 is embedded in the vicinity of the second passage forming recess 44.

  The high heat conduction member 56 is embedded in the high heat conduction member housing recess 52 that is recessed in the second chill vent member main body 48.

  The high heat conductive member 56 is fixed in the high heat conductive member housing recess 52 with powder-containing silicon grease or the like. The reason for using the powder-containing silicon grease is the same as in the case of fixing the high thermal conductive member 55, and thus the description thereof is omitted.

  High heat conduction members 55 and 56 are provided with cooling pipes 57 and 58, respectively. Cooling water or the like is caused to flow in the cooling pipes 57 and 58 to cool the first chill vent member 41 and the second chill vent member 42.

  As a material of the first chill vent member main body 47 and the second chill vent member main body 48, steel, preferably hot die steel (hot die steel) is usually used. Examples of hot mold steel include SKD61, which is JIS steel. Here, steel means a metal containing 0.3% to 2.0% by mass of carbon in iron.

  For example, copper, silver, gold, aluminum, silicon carbide, or ceramic is used as the material of the high heat conductive members 55 and 56. Since copper, silver, gold, aluminum, silicon carbide or ceramic has a higher thermal conductivity than steel, the first chill vent member 41 and the second chill vent member 42 are entirely made of steel. Only in the portion 56, the heat conduction of the first chill vent member 41 and the second chill vent member 42 is improved.

  Since copper, silver, gold, aluminum, silicon carbide or ceramic has a higher material cost than steel, the entire first chill vent member 41 and second chill vent member 42 are made of copper, silver, gold, aluminum, silicon carbide or If it is made of ceramic, it becomes too expensive, but only the portion of the high thermal conductivity members 55, 56 is made of copper, silver, gold, aluminum, silicon carbide or ceramic, so that the material cost is not more expensive than necessary. The chill vent 40 having high thermal conductivity can be produced.

  Copper, silver, gold or aluminum is softer than steel. For this reason, when the whole or the surface of the first chill vent member 41 and the second chill vent member 42 is made of copper, silver, gold, or aluminum, the gas cooling passage 49 is formed by biting the solidified aluminum pieces into the gas cooling passage 49. The surface of the first passage forming recess 43 or the second passage forming recess 44 may be depressed or turned up.

  If the surface of the first passage forming recess 43 or the second passage forming recess 44 is depressed or turned up, the flow of gas and air in the gas cooling passage 49 becomes uneven, and the quality of the product may be deteriorated. is there.

  Since the surfaces of the first chill vent member 41 and the second chill vent member 42 are made of steel harder than copper, silver, gold, or aluminum, the chill vent 40 has the first passage formation recess 43 and the second passage formation recess 44. It is difficult to cause depressions and turns on the surface, and the product quality can be kept high.

  Furthermore, since copper is a metal that is more easily corroded than steel, if the entire or surface of the first chill vent member 41 and the second chill vent member 42 is made of copper, the life of the chill vent 40 may be shortened.

  The chill vent 40 has a long life because the surfaces of the first chill vent member 41 and the second chill vent member 42 are made of steel having higher corrosion resistance than copper.

[Mold]
The mold 10 is formed into a split mold structure composed of a fixed mold 11 and a movable mold 12. In the mold 10, the movable mold 12 is pressed against the fixed mold 11 so as to be able to advance and retreat, and a cavity 15 is formed inside.

  The fixed mold 11 is attached to a fixed die plate 61 of a die casting machine.

  The movable mold 12 is attached to a movable die plate 62 of a die casting machine via die blocks 63 and 64.

  Between the movable die plate 62 and the movable mold 12 of the die casting machine, pin plates 65 and 66 having through holes (not shown) are arranged. Return pins 69 and 70 that are spanned between the movable die plate 62 and the movable die 12 of the die casting machine are inserted into through holes (not shown) of the pin plates 65 and 66. Thus, the pin plates 65 and 66 are guided by the return pins 69 and 70 and can be moved.

  Ejector pins 67 and 68 project from the surface of the pin plate 65 on the movable mold 12 side. The ejector pins 67 and 68 are inserted into through holes 71 and 72 provided in the movable mold 12.

  The ejector pins 67 and 68 can project to the cavity 15 side of the movable mold 12 by moving the pin plate 65 to the movable mold 12 side.

  Next, the operation of the die casting apparatus 1 will be described with reference to FIGS. 1 and 4.

  FIG. 4 is a cross-sectional view for explaining the operation of the die casting apparatus according to the present invention.

  First, the molten metal 80 is injected from the molten metal inlet 22 of the sleeve 20 into the internal space 28 using a ladle (not shown). The amount of the molten metal 80 in the internal space 28 is usually 20% to 60% of the total volume of the internal space 28.

  Next, the plunger 30 is pushed in the direction of arrow F. The plunger 30 is pushed in at a speed of about 10 cm / s to 30 cm / s when the tip of the plunger head 31 is in the low speed sliding portion L of the sleeve body 21.

  At this time, in the internal space 28, the molten metal 80 is pushed in and the gas is compressed. The compressed gas passes through the gas vent groove 25 of the sleeve 20 and escapes toward the molten metal inlet 22 in the direction indicated by the arrow G. For this reason, it becomes difficult to mix gas into the molten metal 80 to be pushed.

  When the tip of the plunger head 31 reaches the high-speed sliding portion H of the sleeve main body 21, the plunger 30 is pushed in at a speed of about 100 cm / s to 1000 cm / s, and the molten metal 80 is fed from the molten metal inlet 14. It is press-fitted into the mold 10.

  The molten metal 80 press-fitted into the mold 10 is filled into the cavity 15, and the tip of the molten metal 80 passes through the mold degassing port 17 and passes through the end 45 of the gas cooling passage 49 of the chill vent 40. It enters the cooling passage 49 and is cooled and solidified in the gas cooling passage 49.

  When a gas is contained in the molten metal 80, it is discharged into the atmosphere from the gas cooling passage 49 of the chill vent 40. Since the cooling efficiency of the chill vent 40 is high by the high heat conducting members 55 and 56, the interval between the gas cooling passages 49 can be increased, and the gas generated from the mold 10 is discharged smoothly and smoothly.

  According to the die-casting apparatus 1, the die-cast product that has been cooled in the cavity 15 uses the sleeve 20 with the gas vent groove 25, so that it is difficult for gas to be caught in the molten metal 80, and the casting nest Etc. are less likely to occur and the product yield is improved.

  Moreover, according to the die-casting apparatus 1, since the chill vent 40 having high cooling efficiency and a large interval between the gas cooling passages 49 is used, the interval between the gas cooling passages 49 can be increased and generated from the mold 10. Gas is discharged smoothly and smoothly. As a result, defects such as a casting nest hardly occur in the die-cast product, and the product yield is improved.

  Furthermore, according to the die casting apparatus 1, the chill vent 40 can be manufactured at low cost because the high heat conductive member 55 is used only in necessary portions and the other portions use general-purpose materials such as steel.

  The die casting apparatus 1 may be configured to use only the sleeve 20 or the chill vent 40. The action in this case is the same as the action when only one of the sleeve 20 or the chill vent 40 is used.

Sectional drawing of the die-casting apparatus which concerns on this invention. The perspective view of the sleeve which concerns on this invention. The perspective view of the chill vent which concerns on this invention. Sectional drawing explaining an effect | action of the die-casting apparatus based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Die-casting apparatus 10 Mold 11 Fixed mold 12 Movable mold 14 Molten metal inlet 15 Cavity 17 Mold gas vent 20 Sleeve 21 Sleeve main body 22 Molten metal inlet 23 Molten metal outlet 24 Plunger insertion port 25 Gas vent groove 26 Gas vent Groove end 27 Inner wall 28 Internal space 30 Plunger 31 Plunger head 32 Plunger rod 40 Chill vent 41 First chill vent member 42 Second chill vent member 43 First passage forming recess 44 Second passage forming recess 45 Gas cooling passage end 46 Gas cooling passage end 47 First chill vent member main body 48 Second chill vent member main body 49 Gas cooling passage 51, 52 High heat conduction member accommodating recess 55, 56 High heat conduction member 57, 58 Cooling pipe 61 Fixed die plate 62 Movable die plates 63, 64 Die block 6 , 66 pin plate 67 ejector pin 69 returns the pin 71 through hole 80 metal melt

Claims (14)

A sleeve for pushing the molten metal into the molten metal inlet of the mold in cooperation with the plunger sliding in the internal space;
In a die-casting apparatus provided with a mold gas vent on the tip side of the cavity of the mold, and a chill vent that vents the gas in the cavity,
The sleeve has a gas communicating with the molten metal inlet on a part of an inner wall surface of the sleeve main body having a molten metal inlet into which the molten metal is injected and a molten metal outlet opening at the tip to push out the molten metal. Ditch is engraved,
The chill vent cooperates with the first passage forming recess when the first chill vent member is combined with the first chill vent member having a first passage forming recess formed in the first chill vent member main body. And a second chill vent member formed in the second chill vent member main body, wherein the second passage forming recess forming the gas cooling passage having both ends opened to the outside comprises the first and second chill vents. The members are characterized in that high thermal conductive members made of a material having higher thermal conductivity than the first and second chill vent member bodies are embedded in the vicinity of the first and second passage forming recesses, respectively. Die casting equipment. 2. The die casting apparatus according to claim 1, wherein the die casting apparatus is used in an atmosphere open die casting method. A degassing groove leading to the molten metal inlet is engraved on a part of the inner wall surface of the sleeve body having a molten metal inlet into which the molten metal is injected and a molten metal outlet that opens at the tip and pushes out the molten metal. A sleeve characterized by being installed. The sleeve according to claim 3, wherein the sleeve main body is disposed sideways, and the gas vent groove is engraved on an upper portion of an inner wall surface constituting an internal space of the sleeve main body. The sleeve according to claim 3, wherein the gas vent groove is formed in a low-speed sliding portion of the sleeve body in which a plunger slides in the internal space at a low speed. The sleeve according to claim 3, wherein a plurality of the gas vent grooves are provided. The sleeve according to claim 3, wherein the molten metal is an aluminum alloy, a zinc alloy, a magnesium alloy, or a copper alloy. The sleeve according to claim 3, wherein the sleeve is attached to a molten metal inlet of a die of a die casting apparatus. A first chill vent member in which a first passage forming recess is formed in the first chill vent member body;
When combined with the first chill vent member, the second chill vent member main body has a second passage formation recess that forms the gas cooling passage having both ends opened to the outside in cooperation with the first passage formation recess. A second chill vent member engraved,
The first and second chill vent members are made of a material having higher thermal conductivity than the first and second chill vent member bodies in the vicinity of the first and second passage forming recesses, respectively. A chill vent characterized by being embedded. The chill vent according to claim 9, wherein the high heat conductive member is embedded in a high heat conductive member housing recess recessed in the first and second chill vent member main bodies. 10. The chill vent according to claim 9, wherein a material of the first and second chill vent member bodies is steel, and a material of the high heat conductive member is copper, silver, gold, aluminum, silicon carbide, or ceramic. The chill vent according to claim 9, wherein the molten metal press-fitted into a mold to which the chill vent is attached is an aluminum alloy, a zinc alloy, a magnesium alloy, or a copper alloy. The chill vent according to claim 9, wherein the chill vent is attached to a die gas vent of a die of a die casting apparatus. A gas vent groove formed in the inner wall surface of the sleeve having an internal space and having a molten metal inlet into which the molten metal is injected is formed so as to communicate with the molten metal inlet. When the molten metal is pushed out into the mold by sliding the plunger in the internal space, the gas in the internal space compressed by the plunger is extracted from the gas vent groove to the molten metal inlet. A die casting method characterized by the above.

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