JP2005329419A - Apparatus and method for forming metal with die casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for forming a metal with die casting, with which a high quality formed product can continuously and efficiently be produced. <P>SOLUTION: This apparatus for forming the metal with the die casting, is provided with a holding furnace 5 for storing molten-state forming material, an injection device 6 connected with the holding furnace 5 through an opening/closing valve 55, a furnace tube 3 having a pouring hole 35 opened upward at the other end and connected with a cylinder 62 in the injection device 6 at the one end, the dies composed of a movable die 2 and a fixed die 1 forming a runner 41 and a die cavity 4 communicated with a pouring hole 32 in the furnace tube 3, and a plunger tip driving means for taking out/inserting the plunger tip 61 into the cylinder 62 in the injection device 6. The position of the plunger tip 61 is adjusted with this plunger tip driving means, and after matching the molten metal surface of the forming material 9 as the molten state in the pouring hole 35 in the furnace tube 3 to a reference surface of the pouring hole 35, the fixed die 1 and the movable die 2 are clamped and molten-state forming material is filled up into a die cavity 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a metal die-cast molding apparatus and a molding method in which a melted molding material is evacuated in a vacuum vessel and press-fitted into a mold.

  Metal die-cast molding is a metal molding technique that has been known for a long time, and a die-cast molding method as shown in Patent Document 1 below is known for metal die-cast molding.

  As described in Patent Document 1 below, as a conventional metal die casting molding method, a means for holding a molten molding material (hereinafter referred to as molten metal) and a means for injecting molten metal into a mold cavity are integrated. There are known a hot chamber system provided and a cold chamber system in which both means are separately provided.

  The hot chamber method can suppress the oxidation of the molten metal, so that the oxide is less involved, but the gooseneck part and nozzle part are always in contact with the molten metal during molding, so the gooseneck part and nozzle part are invaded by the molten metal. There was a problem that it was easy to be done. Therefore, there are many restrictions on the molding material and its casting conditions as compared with the cold chamber method.

The cold chamber method can increase the injection pressure and injection speed of the molten metal due to its structure, but even if the molten metal is transferred from the holding furnace to the cylinder using a metal pump, the molten metal that has entered the cylinder is converted into air. As a result, oxides are generated in the molding material, and the temperature of the molten metal decreases in the cylinder. Furthermore, when the molten metal is filled into the mold cavity with the plunger tip, there is a problem that the molten metal in the cylinder is mixed with air existing in the Linda and filled into the mold cavity.
JP 2001-239354 A

  In such a conventional hot chamber system, since the molten metal is configured to pass through the gooseneck portion and the nozzle portion, the structure is complicated, and the heat resistance / corrosion resistance and rigidity of the flow channel with respect to the molten metal are determined. There was a problem of how to maintain.

  In addition, even if the cylinder or plunger tip is worn slightly, the molten metal sandwiched between the two during operation of the plunger tip will immediately solidify, which may disturb the working conditions of the plunger tip or move the plunger tip. There was a problem that sometimes the counterpart cylinder was damaged.

  Further, the conventional die casting method needs to keep the molten state in a state where the molten metal is always exposed to air or, in some cases, to a combustion flame during work. For this reason, it is difficult to avoid the entry of oxygen and hydrogen generated by the decomposition of moisture into the molten metal. When the molten metal filled in the mold cavity solidifies, it is released into the molded product and becomes a defect of the molded product. Was expensive.

  Therefore, the present invention was conceived for the purpose of providing a novel die-cast molding apparatus and molding method that differ in basic principle from the conventional hot chamber system and cold chamber system.

  A metal die-cast molding apparatus of the present invention includes a holding furnace for storing a molding material in a molten state, an injection device including a plunger tip and a plunger rod and a cylinder coupled to the holding furnace via an opening / closing valve, A furnace tube having one end coupled to the cylinder of the injection device and having an inlet opening upward at the other end, and a movable mold that forms a runner and a mold cavity communicating with the furnace tube inlet in a mold-clamped state. And a mold comprising a fixed mold, and a plunger tip driving means for inserting and removing the plunger tip of the injection device into the cylinder, and adjusting the position of the plunger tip by the plunger tip driving means, After the molten metal surface of the molten molding material at the furnace tube inlet is aligned with the reference surface of the inlet, the mold is clamped to form a molten state. The material is a device for filling into the mold cavity.

  The metal die-cast molding method of the present invention includes a step of storing a molten molding material in a holding furnace, and a plunger chip and a plunger rod through the open / close valve for storing the molding material stored in the holding furnace. An injection device comprising a cylinder and one end of which is connected to the cylinder of the injection device, and the other end is injected into a furnace tube having an inlet opening upward; the open / close valve is closed; and the plunger tip is operated. Adjusting the level of the molten metal at the furnace tube inlet, and clamping a mold comprising a movable mold and a fixed mold to form a runner and a mold cavity communicating with the furnace tube inlet; And the step of filling the mold cavity with the molten molding material by driving the plunger tip of the injection device.

  According to the metal die cast molding apparatus and method of the present invention, the molten molding material subjected to the degassing treatment is filled in the mold cavity of the mold in a high vacuum, so that air is not mixed into the molding material, There is no void in molded products.

  It is possible to make the initial conditions uniform in each molding sequence by controlling the temperature and liquid level of the molten metal supplied from the furnace tube.

  By making the initial conditions uniform and filling the molten metal with numerical control by a pulse motor, the injection speed is controlled according to the cross-sectional shape in the mold cavity of the mold, and the rising speed of the molten metal surface is appropriately adjusted Can be controlled.

  By providing a runner constriction body in the runway that leads to the mold cavity of the mold and providing a volume reduction part in the mold, after filling the mold cavity with the molten molding material, the runner constriction body is operated to narrow the runway By quickly closing the runner and then operating the volume reduction section, the volume of the mold cavity can be reduced without pressure leakage of the melt, so the amount of shrinkage when the melt is solidified can be replenished. Can eliminate the sinkhole.

  According to the present invention, since the degassed molten metal is used on the basis of these effects, a high-quality molded product can be produced continuously and efficiently, and there is no void in the product. The product can be welded.

(First embodiment)
As shown in the perspective view showing the partial cross section of FIG. 1, the metal die-cast molding apparatus according to the embodiment of the present invention includes a fixed die 1, a movable die 2, and simple substances such as aluminum, zinc, magnesium, and copper. Alternatively, a holding furnace 5 for storing molten metal (molten molding material) made of these alloys, an open / close valve 55 provided at a molten metal outlet of the holding furnace 5, and a molten metal coupled to the open / close valve 55 are added. There are provided an injection device 6 for pressing, and a furnace tube 3 for pumping the molten metal pressurized by the injection device 6 into the mold cavity 4 of the fixed mold 1 and the movable mold 2 which are clamped.

  The holding furnace 5, the injection device 6, the furnace tube 3, the open / close valve 55, and the fixed mold 1 are fixed to the base via the support member 7, and the movable mold 2 is mounted on a moving base that moves on the base. Then, it is configured to be joined (clamped) and separated (opened) with respect to the fixed mold 1 by a hydraulic device or the like. At the time of this joining, the mold parts 1 and 2 are aligned by inserting the guide pin g of the fixed mold 1 into the guide hole h (see FIG. 5) of the movable mold 2.

  As shown in the plan view of the opened state of FIG. 3 and the longitudinal sectional view of FIG. 4 cut along the line AA in FIG. 3, the fixed die 1 includes a fixed mother die 11, a fixed insert 12, The movable mold 2 is composed of a movable mother die 21, a movable insert 22, and a depression 23 that forms a runner. When the movable mold 2 is joined and clamped, as shown in FIG. 6, both the movable insert 22 and the fixed insert 12 are united to form the mold cavity 4, and two opposing depressions 13, 23 are formed. As a result, a runner 41 is formed.

  Furthermore, the fixed mold 1 and the movable mold 2 are provided with runner narrowing bodies 14 and 24 for narrowing the runner 41 formed when the mold is clamped together.

  As shown in the plan view of the mold clamped state in FIG. 5 and the longitudinal sectional view in FIG. 9 cut along the line AA in FIG. 5, the runner constriction body 14 formed in the fixed mold 1 and the movable mold 2. , 24 is a plate material that protrudes from the runner 41 and narrows the runner 41. By narrowing the runner 41, a slit 44 is formed, and solidification of the filled molten metal 9 starts from this slit 44 portion. It is something to be made.

  As shown in the longitudinal sectional views of FIGS. 4 and 6, the movable mold 2 is formed with a volume reducing portion 27, which is provided at a portion that does not affect the molded product and that solidifies relatively slowly. It is provided to replenish the amount of contraction that contracts when the molten metal 9 solidifies. The volume reducing portion 27 is composed of a cylinder 28 that penetrates the movable mother die 21 and the movable insert 22, and a piston 29 that is driven from the outside.

  In order to exhaust the air in the mold cavity 4 formed by clamping the fixed mold 1 and the movable mold 2 together, the fixed mold 1 has an exhaust hole 45 communicating with a vacuum pump (not shown). Is provided. The exhaust hole 45 opens to the side of the cylinder 46 and is opened and closed by inserting and removing the inserted piston 47 (see FIG. 6).

  The recess 13 forming the runner of the fixed mold 1 is provided with a vent hole 16 that communicates with the atmosphere via an open / close valve (not shown). As shown in FIG. 11, which is cut along line BB in the plan view of FIG. 5, the on-off valve has a cylinder 15 through which a piston 17 is inserted, and a vent hole 16 that opens laterally from the cylinder 15. And is opened and closed by inserting and removing the piston 17. 11A shows a state where the piston 17 is inserted and the vent hole 16 is closed, and FIG. 11B shows a state where the piston 17 is extracted and the vent hole 16 is opened.

  Further, an extruding mechanism is provided on the back side of the movable mold 2, and the extruding mechanism is constituted by an extruding plate 25 and an extruding pin 26 that are extruded by a hydraulic device or the like. In this extrusion mechanism, the molded product solidified in the mold cavity 4 is peeled off from the surface of the insert 22 by the extrusion plate 25 and the extrusion pin 26 and dropped.

  The holding furnace 5 retains a quantity of molten metal that can be shot at a set temperature, and degass the gas in the molten metal. As shown in FIGS. The core 52 is heated by a heat retaining electric heater such as a Kanthal wire, and at its bottom is a nozzle for injecting an inert gas or nitrogen for stirring the molten metal and promoting degassing, and an open / close valve The lid 51 is provided with an exhaust port 53 that communicates with a vacuum pump (not shown). The furnace shell portion in contact with the molten metal in the core portion 52 is made of ceramics, and the outside of the core portion 52 is casted with heat-resistant steel.

  2, the injection device 6 includes a cylinder 62, a plunger tip 61 and a plunger rod 63 that are inserted through the cylinder 62. A hole 64 communicating with the opening / closing valve 55 is formed upward in the side portion of the cylinder 62 that is in the vicinity of the tip of the stroke, and the tip of the cylinder 62 is configured to be continuous with the furnace tube 3. The plunger tip 61 is driven by a pulse motor (not shown) coupled to the plunger rod 63. The length of the plunger tip 61 is set so as to close the hole 64 of the cylinder 62 even at the rear end of the stroke.

As the ceramic used for the cylinder 62 and the plunger tip 61 constituting the injection device 6 and the furnace tube 3, aluminum titanate ceramic that can withstand the molten metal 9 is suitable. Aluminum titanate ceramics (Al ₂ TiO ₅ ) is obtained by sintering a mixture of approximately the same amount of titanium oxide and alumina, is not easily violated by molten aluminum, has non-wetting properties to molten aluminum, and It is resistant to repeated thermal shocks and has high toughness, high corrosion resistance, and wear resistance.

  However, since aluminum titanate ceramics have high compressive strength but low tensile strength, the outside of the ceramic lining is cast with heat-resistant steel.

  The furnace tube 3 pumps the molten metal 9 into the mold cavities 4 of the fixed mold 1 and the movable mold 2 that are clamped, and is a plan view (a), a longitudinal sectional view (b), and a side view (c) of FIG. ), A ceramic tube 31 is cast with heat-resistant steel. Flange 33 is formed in the openings at both ends of the cast heat-resistant steel cylinder 32.

  Then, as shown in the enlarged sectional view (d) of FIG. 16, the flange 33 is hermetically joined via a heat-resistant metal 0 ring 34 in which a stainless steel pipe is bent into a ring shape and both ends are welded to each other. A plurality of furnace tubes 3 are combined to form a long furnace tube, and an airtight state can be maintained both when the mold cavity 4 is evacuated to high vacuum and when molten metal is pumped.

  As shown in the cross-sectional views of FIGS. 4 and 6, the upper end opening opened upward of the furnace tube 3 is in airtight communication with the runner 41 of the mold cavity 4 through a seal, and injects the molten metal 9. An inlet 35 is formed. A heater (not shown) is provided on the outside of the cast furnace tube 3, and the outside is surrounded by a heat insulating material (not shown).

  As described above, when the holding furnace 5 and the mold including the fixed mold 1 and the movable mold 2 are connected via the furnace tube 3, the distance between the holding furnace 5 and the mold is changed by changing the length of the furnace tube 3. Since it can be set arbitrarily and a space can be formed between the holding furnace 5 and the fixed mold 1, the fixed mold 1 is also provided with an extrusion mechanism and solidified in the mold cavity 4. The product can be peeled off from the surface of the stationary insert 12 and dropped.

  When a symmetrical molded product is manufactured using a symmetrical mold, the molded product is held in the nesting 12, 22 of the fixed mold 1 or the movable mold 2 when the mold is opened. It is not decided. However, if both the fixed mold 1 and the movable mold 2 are provided with extrusion mechanisms, the symmetrical molded product can be peeled off from the nest and dropped, regardless of the nest in which the moulded product is held. It is.

  In each molding sequence, the melt level control of the melt 9 and the temperature control of the melt 9 at the inlet 35 of the furnace tube 3 are extremely important for quality control of the molded product. Therefore, in the metal die cast molding apparatus of the present invention, as shown in the perspective view of FIG. 17, a hot water level detection sensor is provided at the injection port 35 to control the hot water level, and an optical thermometer such as a color thermometer. 84 is provided to control the outlet temperature of the molten metal 9.

  The molten metal level detection sensor provided in the injection port 35 is configured by a laser light source 81 and a photoelectric conversion element 82 such as a phototransistor arranged opposite to each other, and detects a molten metal level state of the molten metal 9 in the injection port 35.

  That is, when the plunger tip 61 of the injection device 6 is gradually inserted, the molten metal surface rises slightly due to the surface tension at the injection port 35 of the furnace tube 3 and the laser beam 83 is cut off, and the insertion of the plunger tip 61 is stopped. Then, when the plunger tip 61 of the injection device 6 is gradually pulled out, the molten metal surface that has risen due to the surface tension falls, and when the laser beam 83 enters the photoelectric conversion element 82, the molten metal surface and the injection port of the molten metal 9 are injected. In this state, the 35 opening surfaces coincide with each other.

  It is difficult to provide a heating heater up to the inlet 35 and the tip of the furnace tube 3. Therefore, even when the molten metal surface of the molten metal 9 and the opening surface of the injection port 35 coincide with each other, the pulling operation of the plunger tip 61 is continued for a certain stroke and then stopped. The hot water surface when stopped is a position where a heating heater (not shown) is provided in the furnace tube 3 and is a reference position where the molten metal 9 can be kept warm.

  Further, when detecting the molten metal surface state of the molten metal 9, the optical thermometer 84 measures the outlet temperature of the molten metal 9 at the inlet 35, and the heater of the furnace tube 3 is adjusted so that this temperature is optimum for casting. To control.

  As described above, if the molten metal 9 in the injection port 35 is kept in a proper state and the temperature is kept waiting for each molding sequence, the initial casting conditions are always constant and the casting is performed at a high vacuum. As a result, high-quality molded products can be produced continuously and efficiently.

  When the furnace tube 3 is supported, if it is supported from the outside of a heat insulating material (not shown), the attitude of the furnace tube 3 cannot be accurately maintained. Therefore, the support member 7 shown in FIG. The cylindrical body 32 is directly supported.

  This support member 7 fixes the furnace tube 3 to the base, and is integrally made of a heat-resistant steel rod 74 whose tip penetrates the heat-insulating material and is coupled to the heat-resistant steel cylinder 32 and an iron casting. A base 71 composed of a flange portion 72 and a cylindrical portion 73, a heat-resistant pressure-resistant ceramic block 75 interposed between the lower portion of the heat-resistant steel rod 74 and the base portion 71, and a hole penetrating the heat-resistant pressure-resistant ceramic block 75 in the vertical direction A heat-resistant pressure-resistant ceramic column 76 inserted into the base 71 and a steel height adjusting screw 77 that is screwed into the bottom of the base 71 and adjusts the height of the heat-resistant steel rod 74 together with the ceramic column 76. ing. The ceramic block 75 and the ceramic column 76 are provided in order to prevent heat loss by blocking heat conducted from the heat-resistant steel cylinder 32 through the heat-resistant steel rod 74 and to fix the heat-resistant steel rod reliably.

  Similarly, the opening / closing valve 55 and the cylinder 62 of the injection device 6 are also fixed to the base by the support member 7 and surrounded by a heat insulating material.

  Next, the molding operation of the metal die cast molding apparatus according to the embodiment of the present invention configured as described above will be described.

  The temperature in the furnace tube 3 is set to a temperature suitable for the molding material in the molten state, and as shown in FIG. 2, the tip of the plunger tip 61 is set to the initial state where it is moved to just before the hole 64 of the cylinder 62. Close the open / close valve 55.

  The molten metal 9 is injected into the core 52 of the holding furnace 5 to a level lower than the injection port 35 of the furnace tube 3, and the electric heater is controlled and kept at a set temperature to be stored. The lid 51 is closed in an airtight manner and communicates with a vacuum pump to perform degassing processing. During this degassing process, inert gas or nitrogen is jetted from the nozzle at the bottom of the core 52, and the molten metal 9 is stirred to promote degassing.

  When the degassing process is completed, the open / close valve 55 is opened to allow the degassed molten metal 9 to flow into the furnace tube 3. At this time, since the molten metal is injected into the holding furnace 5 only to a level lower than the inlet 35 of the furnace tube 3, it does not overflow from the inlet 35.

  When the plunger tip 61 is gradually inserted after closing the opening / closing valve 55, the molten metal surface rises a little due to the surface tension at the inlet 35 of the furnace tube 3 and the laser beam 83 is cut off. To stop. When the plunger tip 61 is gradually pulled out, the molten metal surface raised by the surface tension falls, and when the laser beam 83 enters the photoelectric conversion element, the molten metal surface of the molten metal 9 and the opening surface of the injection port 35 coincide. Since it is in a state, the position of the plunger tip 61 is memorized, and is further pulled out by a fixed stroke and stopped. This stop position becomes the reference surface of the molten metal at the start of filling when the molten metal 9 is filled into the mold.

  Next, as shown in FIG. 6, the fixed mold 1 and the movable mold 2 that are opened are combined to perform mold clamping. As shown in FIG. 6, because of this mold clamping process, the injection port 35 of the furnace tube 3 communicates with the mold cavity 4 through the mold runner 41, so that the piston 47 of the fixed mold 1 is retracted and exhausted. When the hole 45 is opened and the air in the mold cavity 4 is exhausted, the mold runner 41 can also be exhausted. Even if evacuation is started after mold clamping, since the mold runner 41 is airtightly closed by the inlet 35 of the furnace tube 3, the degree of vacuum is increased without air entering the mold cavity 4. Can do.

  As shown in the sectional view of FIG. 7, after the piston 47 of the fixed mold 1 is advanced to close the exhaust hole 45, the plunger tip 61 is pushed out to start filling the mold 9 with the molten metal 9, and the sectional view of FIG. As shown in the drawing, as soon as the filling of the molten metal 9 is completed, as shown in the cross-sectional view of FIG. 9, the runner narrowing bodies 14 and 24 are projected from the runner 41 to form the slit 44 in the runner 41. The melt 9 in the slit 44 is a thin plate. The plate-like molten metal 9 has a large surface area despite its small volume, so it immediately solidifies and closes the runner 41.

  Since the molding material in the molten state contracts when it solidifies, the piston 29 of the volume reducing portion 27 is driven into the cylinder 28 as shown in the cross-sectional view of FIG. The remaining molten metal 9 is pressurized and extruded. Thus, by pressurizing the molten metal 9 during the solidification period, sink marks due to shrinkage can be eliminated.

  When a predetermined time elapses, as shown in the sectional view of FIG. 12, the molten metal 9 in the mold cavity 4 is solidified and a molded product S is completed.

  The molten metal 9 in the furnace tube 3 does not solidify because the heating by the heater 35 continues, but since the mold cavity 4 was previously exhausted, the inlet 35 of the furnace tube 3 is also exhausted. Therefore, the plunger tip 61 of the injection device 6 cannot be extracted. Therefore, the vent hole 16 of the cylinder 15 closed by the piston 17 as shown in the sectional view (a) of FIG. 11 is pulled out, and the piston 17 is pulled out as shown in the sectional view (b) of FIG. By opening and communicating with the atmosphere, as shown in the cross-sectional view of FIG. 12, the runner 41 becomes atmospheric pressure, and the plunger tip 61 of the injection device 6 can be inserted and removed, and at the opening of the furnace tube 3. The hot water surface can be changed.

  When the plunger tip 61 of the injection device 6 is pulled back by a small distance, the molten metal 9 that was excessive when filling the mold cavity 4 descends in the injection port 35 due to gravity. The molten metal 9 that has descended maintains a state of being confined in the furnace tube 3, so that the molten metal 9 in the furnace tube 3 is held without touching the air except for the exposed surface of the inlet 35, and from the inlet 35. There is no overflow.

  In this state, as shown in the cross-sectional view of FIG. 13, after the runner constrictions 14 and 24 protruding from the runner 41 and the piston 29 of the volume reducing portion 27 are retracted, as shown in the cross-sectional view of FIG. When the movable mold 2 is opened, the inlet 35 of the furnace tube 3 is pulled away from the movable mold 2, and the molded product S is held by the movable mold 2.

  Therefore, as shown in the cross-sectional view of FIG. 15, the extrusion plate 25 is operated to protrude the extrusion pin 26, and the molded product S is peeled off from the movable insert 22 and dropped, thereby completing one molding sequence.

  In this way, since the mold cavity 4 is brought into a high vacuum state, the plunger tip 61 of the injection device 6 can be pushed to fill the molten metal 9, so that the molten metal 9 can be quickly molded without solidifying during the filling. It is possible to fill every corner of the cavity 4. Therefore, a high-quality molded product S can be produced.

(Second Embodiment)
In the present invention, when the molten metal 9 is filled into the mold cavity 4, if the plunger tip 61 of the injection device 6 that pushes out the molten metal 9 is driven by a pulse motor, the insertion speed is controlled in accordance with the shape of the mold cavity 4. Is possible.

  That is, when the molten metal 9 is filled from the lowermost part of the mold cavity 4 at a constant speed, when the molten metal surface of the molten metal 9 in the mold cavity 4 rises in a portion having a large cross-sectional area, the rising speed is slow, and a portion having a narrow cross-sectional area is formed. When rising, the rising speed becomes faster, and the rising speed of the molten metal 9 changes significantly. In particular, when the hot water surface reaches the horizontal top surface in the mold cavity 4, the cross-sectional area changes suddenly, so that the hot water flow direction changes suddenly and a strong stirring vortex pool, etc., which triggers the molded product. May form depressions and voids.

  Therefore, in the present invention, the sectional area for each height of the mold cavity 4 is stored in advance in a computer table, and the initial conditions are made constant for each molding sequence, so that the section stored in the table is stored. By reading the area data and performing numerical control, the speed of the pulse motor that pushes the plunger tip 61 of the injection device 6 is adjusted according to the cross-sectional shape of each height of the mold cavity 4, and the molten metal 9 The injection rate is controlled to be proportional to the area of the hot water surface.

  Furthermore, for example, when the hot water surface reaches a horizontal top surface, that is, when the cross-sectional area decreases rapidly, by numerical control by a computer so as to decrease the speed of the pulse motor immediately before, An excellent quality molded product free of dents and voids can be obtained.

The perspective view which shows the state which opened the metal die-casting apparatus which concerns on embodiment of this invention, partly cut | judged vertically, 1 is a perspective view showing a holding furnace, an on-off valve and an injection device in the apparatus shown in FIG. The top view which shows the state of the metal mold | die part which the metal die-cast molding apparatus shown in FIG. 1 opened, FIG. 3 is a longitudinal sectional view of a mold part in an opened state shown by cutting vertically along line AA in FIG. 3; The top view which shows the state of the metal mold | die part which clamped the metal die-cast molding apparatus shown in FIG. A longitudinal sectional view showing a state in which the mold part is clamped and the vacuum valve is opened, A longitudinal sectional view showing a state in which the mold part is clamped and the vacuum valve is closed, A longitudinal sectional view showing a state where the mold part is clamped and the mold cavity is filled with molten metal, A longitudinal sectional view showing a state in which the runner narrowing body is operated by clamping the mold part and operating the runner narrowing body, A longitudinal cross-sectional view showing a state in which the volume reduction part is operated by clamping the mold part, It is sectional drawing shown by cut | disconnecting longitudinally in the line BB of FIG. 5, Comprising: (a) The state which closed the vent which leads to a runner, (b) The state which opened the vent which leads to a runner, A longitudinal sectional view showing a state in which the molten metal surface of the inlet is lowered with the mold part clamped, A longitudinal sectional view showing a state in which the runner constriction body is opened with the mold part clamped, A vertical cross-sectional view showing the state of holding and opening the molded product of the mold part, A longitudinal sectional view showing a state in which a molded product is removed from the opened mold part, A plan view (a), a longitudinal sectional view (b), a side view (c), an enlarged sectional view (d) of the main part showing a furnace tube for pumping molten metal, It is a perspective view which shows the state which provided the liquid level sensor and the optical thermometer in the injection port of the ceramic sleeve used with the metal die-casting apparatus which concerns on this invention. It is the front view (a) of the supporting member which supports a member of high temperature, a top view (b), and a longitudinal section (c).

Explanation of symbols

1 Fixed type
11 Fixed matrix
12 Fixed insert
13 depression
14 Yudo constriction
16 Vent 2 Movable type
21 Movable matrix
22 Movable nesting
23 depression
24 Yudo constriction
25 Extruded plate
26 Extrusion pin
27 Volume reduction part
28 piston
29 cylinder 3 furnace tube
31 Ceramic tube
32 Cast heat-resistant steel cylinder
33 Flange
34 Heat resistant metal 0 ring
35 Inlet 4 type cavity
41 Yudo
45 Exhaust hole 45
46 cylinders
47 Piston 5 Holding furnace
51 lid
52 Core
53 Exhaust vent
55 Open / close valve 6 Injection device
61 Plunger tip
62 cylinders
63 Plunger rod 7 Support member 9 Molten metal (molten molding material)
S molded products

Claims (8)

A holding furnace for storing molten molding material;
An injection device comprising a plunger tip and a plunger rod and a cylinder coupled to the holding furnace via an on-off valve;
A furnace tube having one end connected to the cylinder of the injection device and having an inlet opening upward at the other end;
In a mold-clamped state, a mold composed of a movable mold and a stationary mold that form a runner communicating with the furnace tube inlet and a mold cavity; and
A plunger tip driving means for inserting and removing the plunger tip into and from the cylinder via the plunger rod of the injection device;
The position of the plunger tip is adjusted by the plunger tip driving means, and the molten metal surface of the molten molding material at the inlet of the furnace tube is aligned with the reference surface of the inlet, and then the gold A metal die-cast molding apparatus, wherein a mold is clamped to fill the mold cavity with a molten molding material.   2. The metal die cast molding apparatus according to claim 1, further comprising a degassing means for evacuating the holding furnace in a state where the lid is closed.   The metal die-casting apparatus according to claim 2, wherein a molten metal stirring means comprising a nozzle for injecting inert gas or nitrogen gas is provided at the bottom of the holding furnace.   2. A runner narrowing means for projecting into the runner and narrowing the runner in a mold-clamped state and a volume reducing means for reducing the volume of the mold cavity are provided to replenish the amount of shrinkage during solidification of the molding material. The metal die-cast molding apparatus described in 1.   2. The metal according to claim 1, wherein a rising speed of the molten metal surface in the mold cavity is controlled by adjusting a filling speed of a molten molding material in accordance with a cross-sectional shape for each height of the mold cavity. Die-cast molding device.   2. The metal die cast molding apparatus according to claim 1, further comprising exhaust means for evacuating the mold cavity in the mold clamping state. Storing a molten molding material in a holding furnace;
The molten molding material stored in the holding furnace is connected to the injection device consisting of a plunger tip, plunger rod and cylinder via a switching valve, and one end is connected to the cylinder of the injection device, and the other end opens upward. Injecting into a furnace tube having an inlet,
Closing the open / close valve and operating the plunger tip to adjust the molten metal level at the furnace tube inlet;
Clamping a mold composed of a movable mold and a stationary mold to form a runner and a mold cavity communicating with the furnace tube inlet;
Filling the mold cavity with a molten molding material by driving the plunger tip of the injection device;
The metal die-cast molding method characterized by passing through. The metal die-cast molding method according to claim 7, wherein a degassing step of evacuating the holding furnace in a state where the lid is closed is performed.

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