JP2010179331A - Die casting device and die casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for vacuum die casting, in which a die-cast product of high quality is obtained by injection under conditions of low speed and low pressure. <P>SOLUTION: The die casting device comprises: a melting furnace for melting metal; a molten-metal pouring device for pouring the molten metal made in the melting furnace into an insulating container 9; a holding and supplying device for holding and conveying the insulating container, into which the molten metal is poured by the molten-metal pouring device; and a die casting machine including one mold 72 having an opening for storing the insulating container conveyed by the holding and supplying device and the other mold 71 for forming a cavity 73, which is filled with the molten metal, by being superimposed on the one mold 72. A plunger chip 783, which is arranged at the opening and reciprocatingly moved along the axial direction of the opening, compresses and breaks the insulating container in cooperation with the other mold, so that the molten metal is allowed to flow in the cavity. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a die casting apparatus and a die casting method for molding a die cast metal product, and more particularly to a vacuum die casting apparatus and a vacuum die casting method that enable a molten metal to be injected at a low speed and a low pressure.

In the field of automobile development, lightweight metal molding technology has been developed from the viewpoint of reducing vehicle weight and improving engine efficiency. Has been tried.
An aluminum alloy can be cited as a lightweight metal expected to be applied to these, and its practical application to engines and chassis is progressing. With regard to the development of the body, which is a larger part, there have been practical examples so far in Europe and the United States where automobiles in which the entire vehicle body is made of aluminum have been developed. In Japan, there are examples of trial production or small-scale production of automobiles in which the entire vehicle body is made of aluminum.
However, in any of these examples, a large number (for example, 300 points) of individual parts such as press plate, wrought material, and cast material are combined or joined together, which hinders high-cost and low-productivity walls. In rare cases, production has not yet expanded.

  In order to overcome this high cost and low productivity technical barrier, innovative development of die casting technology is indispensable. If the development of die casting technology capable of manufacturing thin, large, and complex parts enables the entire vehicle body to be molded at a low cost with a significantly smaller number of parts (for example, 30 points), the vehicle weight will increase significantly. Reduction can be achieved, and it is possible not only to improve the performance of automobiles but also to have a positive impact on the global environment, such as reducing the amount of exhaust gas.

FIG. 29 is a schematic view showing a conventional die casting apparatus with a vacuum apparatus.
The die casting apparatus shown in FIG. 29 includes a movable mold and a fixed mold disposed on the opposite side of the movable mold. When the movable mold and the fixed mold are clamped, a cavity is formed at the boundary between the movable mold and the fixed mold. The cavity mimics the outer contour of the desired product.
The die casting apparatus includes a plunger. The plunger is provided in the movable mold, and the distal end portion of the plunger communicates with the cavity through the runner. The plunger is filled with molten metal, and when the plunger is operated, the molten metal is injected into the cavity and filled into the cavity.

The injection port of the plunger is disposed at a position away from the cavity via the runner and the gate. In the vicinity of the edge of the cavity on the opposite side of the injection port of the plunger, an overflow, a vacuum valve and a suction path are provided. A vacuum generator (not shown) such as a vacuum pump is disposed downstream of the suction path, and the vacuum generator sucks air in the cavity.
When the plunger operates and the molten metal is injected from the plunger into the cavity via the runner and the gate, the molten metal enters the cavity, the overflow, and the vacuum valve from the edge of the cavity. The molten metal that has entered is detected by a sensor, and this detection closes the vacuum valve, preventing the molten metal from entering the vacuum generator.

The fixed mold (or movable mold) is provided with a pressure pin, and the movable mold is provided with an extrusion pin.
When the molten metal is filled in the cavity, the pressure pin is actuated to further pressurize the inside of the cavity and prevent the solidification shrinkage at the solidification delay site. Thereafter, when the molten metal is solidified in the cavity and the molding is completed, the movable mold and the fixed mold are separated from each other in the mold opening process. And an extrusion pin act | operates, the product shape | molded from the fixed metal mold | die is extruded, and a die-cast metal product is taken out from a die-cast apparatus.

In the die casting apparatus shown in FIG. 29, it is necessary to inject the molten metal from the plunger at a high speed and a high pressure. Because, as described above, the molten metal is also injected into the cavity through the metal plunger that performs injection, the runner and gate for controlling and distributing the flow of the molten metal and eliminating inclusions and impurities in the molten metal. This is because the molten metal needs to flow over a long distance in the mold and the cooling proceeds rapidly. If the molten metal flows and solidifies before completely filling the cavity, the desired product shape cannot be obtained.
On the other hand, high-speed injection causes air entrainment, and high pressure (for example, a molten metal pressure of 500 atm) is required for injection in order to crush the bubbles. Therefore, a huge die-casting machine and a mold that enable high speed and high pressure are required, and the cost must be high. Therefore, for the purpose of reducing entrained air, a complicated and expensive vacuum valve will be introduced, but solidification is fast and sufficient vacuum suction time cannot be taken, there are many leaks from the gaps in the mold, mold release There is a problem that a sufficient degree of vacuum cannot be achieved due to gas generation from the agent and lubricant.

Such high-speed and high-pressure injection of molten metal also causes many quality problems in the die casting technology.
For example, Patent Document 1 and Patent Document 2 show that such high-speed and high-pressure injection causes turbulent flow of molten metal in the cavity, resulting in insufficient gas escape in the cavity. It mentions. Further, Patent Documents 1 and 2 mention that this insufficient outgassing appears as bubbles in the die cast product, leading to a deterioration in the quality of the die cast product.
In addition, Patent Document 1 and Patent Document 2 introduce a non-porous die casting method for replacing the inside of the cavity with an active gas and a method for decompressing the inside of the cavity as a countermeasure for this insufficient gas escape, and such a countermeasure. In the case of adopting the method, the problem is that the structure of the die casting apparatus becomes complicated and the problem that the molten metal is cooled and solidified in the sleeve of the plunger while the cavity is decompressed.
Further, Patent Document 3 mentions the problem of load on the plunger due to high-speed and high-pressure injection.

JP 60-83762 A JP 2005-329464 A JP-A-5-69104

  As exemplified in Patent Documents 1 to 3, it is known that injection of molten metal under high-speed and high-pressure conditions has caused many problems in the die-casting technology. Injecting molten metal to obtain die-cast products has not been successful. In fact, in order to cope with the problems exemplified in Patent Documents 1 to 3, the inventions disclosed in Patent Documents 1 to 3 solve the respective problems on the premise of injection of molten metal under high speed and high pressure conditions. ing.

However, at present, the technology that is truly desired is to obtain a die-cast product by injecting under low-speed / low-pressure conditions. The present invention performs injection under low-speed / low-pressure conditions and casting such as entrainment and shrinkage nests. It is an object of the present invention to provide a die casting apparatus and a die casting method capable of obtaining a high-quality thin-walled die cast product free from defects.
Furthermore, an object of the present invention is to provide a die casting apparatus and a die casting method that enable injection under a low speed / low pressure condition to obtain a large thin molded product such as an automobile body.
In addition, an object of the present invention is to provide a die casting apparatus having a simple and small structure.
Furthermore, an object of the present invention is to provide a die casting apparatus that enables appropriate and precise control according to the type of product.

  The invention according to claim 1 is a melting furnace for melting metal, a pouring device for pouring a molten metal made in the melting furnace into a heat retaining container, and the molten metal is poured by the pouring device. A holding and feeding device that holds and transports the heat retaining container, a mold in which an opening for accommodating the heat retaining container transported by the gripping and feeding device is formed, and the molten metal is filled to overlap the one mold. A plunger chip that reciprocates along the axial direction of the opening, and the plunger tip cooperates with the other mold. The die-casting apparatus is characterized in that the thermal insulation container is compressed and broken to cause the molten metal to flow in the cavity.

The invention according to claim 2 further includes a transport device, and the transport device transports the heat retaining container for storing the molten metal from the pouring device to the gripping and feeding device. It is a die-casting apparatus of description.
Invention of Claim 3 is further equipped with the heat retention furnace distribute | arranged in the middle of the conveyance path | route of the said heat retention container by the said conveying apparatus, This heat retention furnace prevents that the said molten metal becomes below predetermined temperature. 3. The die casting apparatus according to claim 1, wherein the die casting apparatus is characterized by the following.

According to a fourth aspect of the present invention, the conveying device further conveys a gripping cylinder whose both ends are open, and the gripping cylinder externally fits the heat retaining container. The die casting apparatus according to any one of the above.
A fifth aspect of the present invention is the die casting apparatus according to the fourth aspect, wherein at least a part of the opening end portion of the gripping cylinder does not coincide with the opening end portion of the heat retaining container.

According to a sixth aspect of the present invention, the gripping and supplying device includes a moving base that moves from the transfer device to the die casting machine, and a first holding mechanism that is attached to the moving base, and the first holding mechanism Is provided with an inner member disposed inside the heat retaining container, and an outer member disposed outside the gripping cylinder that externally fits the heat retaining container, and at least one of the inner member and the outer member is 6. The die casting apparatus according to claim 5, wherein the die casting apparatus moves toward the other side and sandwiches the heat retaining container and the peripheral wall of the gripping cylinder at the same time.
The invention according to claim 7 includes a second clamping mechanism attached to the movable base, and the second clamping mechanism is arranged inside the gripping cylinder that externally fits the heat retaining container. A member and an outer member disposed outside the gripping cylinder that externally fits the heat retaining container, and at least one of the inner member and the outer member moves toward the other, and the gripping cylinder 7. The die casting apparatus according to claim 6, wherein only the peripheral wall of the body is clamped.

The invention according to claim 8 further includes a filter attachment device, and the filter attachment device attaches a filter member to the opening of the die cast device. It is.
The invention according to claim 9 further includes a filter mounting device for transporting a filter to the die casting machine, wherein the filter includes a filter main body for filtering impurities in the molten metal, and a pair of semi-annular plate members. A ring member, and at least a part of the ring member can be fitted into an end of the opening of the die casting apparatus, and when the filter mounting device conveys the filter to the die casting machine, the filter The die casting apparatus according to any one of claims 1 to 7, wherein the opening of the one mold is at least partially closed.
The invention according to claim 10 is characterized in that the one mold is a fixed mold, the other mold is a movable mold, the movable mold is in contact with the fixed mold, and the fixed position is fixed. The die casting apparatus according to any one of claims 1 to 9, wherein the die casting apparatus moves between a second position separated from the mold.

The invention according to claim 11 is characterized in that the opening is formed by a cylindrical sleeve that penetrates the one mold and extends outward of the one mold. It is a die-casting apparatus according to the above.
The invention according to claim 12 is characterized in that an actuator is attached to an end portion of the sleeve located outside the one mold, and the actuator reciprocates the plunger tip in the sleeve axial direction. 11. The die casting apparatus according to 11.
A thirteenth aspect of the present invention is the die casting apparatus according to the twelfth aspect, wherein the inside of the sleeve includes a pipe line connected to the first vacuum generator.

The invention according to claim 14 is characterized in that the movable mold includes an extrusion pin that passes through the movable mold and slides in the movable mold, and one end of the extrusion pin appears in the cavity. The die casting apparatus according to claim 10.
According to a fifteenth aspect of the present invention, a flow path through which air can flow is formed at a boundary between the extrusion pin and the movable mold, and the flow path is connected to a second vacuum generator. Item 15. The die casting apparatus according to Item 14.

The invention according to claim 16 further includes a take-out device for taking out a molded product molded in the cavity from the die casting machine, and when the movable die is in the second position, the take-out device is the fixed die. The die casting apparatus according to claim 14 or 15, wherein the die casting apparatus is arranged between the movable mold and the movable die and receives the molded product extruded from the extrusion pin.
The invention according to claim 17 is the die casting apparatus according to any one of claims 12 to 16, wherein the actuator vibrates the plunger tip.

The invention according to claim 18 is the die casting apparatus according to any one of claims 1 to 17, wherein the opening is located inward of a region surrounded by the outer peripheral edge of the cavity.
A nineteenth aspect of the present invention is the die casting apparatus according to any one of the first to eighteenth aspects, comprising a plurality of the openings.

The invention according to claim 20 is the die casting apparatus according to any one of claims 1 to 19, further comprising a decompression sensor, wherein the decompression sensor measures a degree of vacuum in the cavity.
The invention according to claim 21 is the die casting apparatus according to any one of claims 1 to 20, further comprising a position sensor, wherein the position sensor measures the position of the plunger tip.
The invention according to claim 22 is the die casting apparatus according to any one of claims 1 to 21, further comprising a pressure sensor, wherein the pressure sensor measures a pressure in the cavity.
The invention according to claim 23 is a decompression sensor that measures the degree of vacuum in the cavity, a position sensor that measures the position of the plunger tip, a pressure sensor that measures the pressure in the cavity, and a temperature in the cavity. And a signal from at least one selected from the group consisting of the pressure sensor, the pressure sensor, the pressure sensor, and the temperature sensor, and a signal corresponding to the received signal. 13. The die casting apparatus according to claim 12, further comprising a control panel that transmits to the actuator, wherein the actuator operates based on the transmitted signal.

The invention according to claim 24 is characterized in that the opening is disposed at a final solidification position where the molten metal filled in the cavity is solidified last. Device.
The invention according to claim 25 is characterized in that the opening is arranged at an optimum filling position where the flow distance of the molten metal flowing in the cavity is the shortest. It is a die casting device.
According to a twenty-sixth aspect of the present invention, the opening is disposed at a position where a force is applied to a portion that requires the most force when the die-cast product is separated from the fixed mold. The die casting apparatus according to any one of the above.

A twenty-seventh aspect of the present invention is the die casting apparatus according to any one of the first to twenty-sixth aspects, wherein a surface of the one mold that forms the cavity is coated with a durable coating agent.
A twenty-eighth aspect of the present invention is the die casting apparatus according to any one of the first to twenty-seventh aspects, wherein a surface of the other mold that forms the cavity is coated with a durable coating agent.
A twenty-ninth aspect of the present invention is the die casting apparatus according to the twenty-seventh or twenty-eighth aspect, wherein the durable coating agent contains mica.
The invention according to claim 30 is the die casting apparatus according to claim 27 or 28, wherein the durable coating agent contains boron nitride.
The invention according to claim 31 is the die casting apparatus according to claim 29 or 30, wherein the durable coating agent further contains water glass.
A thirty-second aspect of the present invention is the die casting apparatus according to the twenty-ninth or thirty-third aspect, wherein the durable coating agent further contains aluminum phosphate.
33. The die casting apparatus according to claim 1, wherein a surface treatment by ceramic spraying is performed on at least a part of a surface of the one mold forming the cavity. It is.
The invention according to claim 34 is characterized in that a surface treatment by ceramic spraying is performed on at least a part of the surface of the other mold forming the cavity. It is.

A 35th aspect of the present invention is the die casting apparatus according to any one of the 1st to 34th aspects, wherein an auxiliary runner having a narrow groove shape is provided on a surface forming the cavity of the one mold.
A thirty-sixth aspect of the present invention is the die casting apparatus according to any one of the first to thirty-fifth aspects, wherein an auxiliary runner having a narrow groove shape is provided on a surface of the other mold forming the cavity.
The invention according to claim 37 is characterized in that a narrow groove-shaped auxiliary runner is provided on a surface forming the cavity of the one mold, and the auxiliary runner traverses an opening for housing the heat retaining container. The die casting apparatus according to claim 9.
The invention according to claim 38 is the die-casting apparatus according to any one of claims 1 to 37, wherein the heat retaining container is made of a cylindrical heat insulating material with one end.

  The invention according to claim 39 is a melting step for melting a desired metal to obtain a molten metal, a pouring step for pouring the molten metal into a one-end-bottomed tubular heat retaining container, and a heat insulation for housing the molten metal. Supplying a container to an opening formed in one mold constituting the die casting machine, and superimposing another mold arranged opposite to the one mold on the one mold of the die casting machine A mold closing process for forming a cavity, and an injection process in which the molten metal contained in the heat insulation container is pushed into the cavity, and the injection process includes a plunger tip disposed in the opening and the other mold. A die-casting method comprising the step of compressing and breaking the heat-retaining container.

The invention according to claim 40 is characterized in that the heat retaining container includes a gripping cylinder for fitting the heat retaining container, and the supplying step sandwiches the peripheral wall of the gripping cylindrical body and the heat insulating container peripheral wall at the same time. 40. The die casting method according to claim 39, further comprising the step of supplying both the gripping cylinder and the heat retaining container to the opening.
In the invention described in claim 41, the opening end of the heat retaining container is inclined with respect to the bottom of the heat retaining container, and the supplying step grips the peripheral wall of the gripping cylinder and is supplied into the opening. 41. The die casting method according to claim 40, further comprising the step of removing the cylinder from the opening.

The invention according to claim 42 further comprises a transporting step after the pouring step and before the supplying step, wherein the transporting step is performed from the hot water pouring device for pouring hot water into the heat retaining container to the die casting machine. The die casting method according to any one of claims 39 to 41, further comprising a step of conveying the heat insulation container to a supply device that supplies the heat insulation container.
The invention according to claim 43 is the die casting method according to claim 42, wherein the transporting step further includes a step of suppressing a temperature drop of the molten metal in the heat insulating container being transported.
44. The invention according to claim 44, wherein the supplying step further includes a step of attaching a filter to the opening formed in the one mold of the die casting machine. This is a die casting method.
According to a 45th aspect of the present invention, the filter includes a ring member made of a pair of semicircular plate members, the ring member is fitted into the opening formed in the one mold of the die casting machine, 44. The die casting method according to claim 39, further comprising a step of partially closing the opening.

The invention according to claim 46 is characterized in that the injection step includes a step of depressurizing the inside of the cavity, and the compressive fracture of the heat insulating container by the plunger tip is performed after the depressurization of the cavity. The die casting method according to any one of 39 to 45.
47. The invention according to claim 47, wherein the injection step includes a step of measuring a degree of vacuum in the cavity, and after the measured value of the degree of vacuum in the cavity becomes a predetermined threshold value or less, the plunger tip performs the measurement. 47. The die casting method according to claim 46, wherein the thermal insulation container is compressed and broken.
A 48th aspect of the present invention is the die casting method according to any of the 39th to 47th aspects, wherein the injection step includes a step of measuring a pressure in the cavity.
A 49th aspect of the present invention is the die casting method according to any one of the 39th to 48th aspects, wherein the injection step includes a step of measuring a temperature in the cavity.

The invention according to claim 50 further comprises a mold opening process for separating the other mold from the one mold, and the mold opening process is performed after the injection process. 49. The die casting method according to any one of 49.
The invention according to claim 51 is the die-casting method according to claim 50, wherein the mold opening step includes a step of moving the plunger tip in the separating direction of the other mold.
The invention according to claim 52 is the die casting method according to claim 51, wherein the mold opening step includes a step of applying vibration to the plunger tip when the plunger tip is moved.

53. The invention according to claim 53, further comprising a take-out step of disposing a take-out device between the one mold and the other mold separated in the mold opening step. 52. The die casting method according to any one of 52.
In the invention according to claim 54, in the take-out step, an extrusion pin attached to the other mold is moved toward the one mold, and a molded product attached to the other mold is supplied to the take-out device. 54. The die casting method according to claim 53, comprising steps.
55. The invention according to claim 55, wherein the removing step comprises a step of applying a release agent to the one mold and the other mold after the molded product is supplied to the removing device. 55. A die casting method according to Item 54.

According to the first to fifth aspects of the present invention, since the molten metal is supplied to the die casting machine using the heat retaining container, the temperature of the molten metal is hardly lowered, and injection under low speed and low pressure conditions is possible. Become. Therefore, it is possible to obtain a high-quality thin die-cast product free from casting defects such as entrainment and shrinkage. Moreover, since the injection molding can be performed at a low speed and a low pressure, the mechanical strength of the die casting machine itself is not required. Therefore, the die casting machine itself can be reduced in size.
In addition, in order to adopt a method of injecting the molten metal by accommodating the insulating container in the opening formed in the die casting machine and then compressing and breaking the insulating container using the plunger tip, the injection of the molten metal is performed. Since it can be performed at a desired position, the flow path of the molten metal in the cavity can be shortened. Therefore, it is possible to obtain a large thin molded product such as an automobile body. For example, when trying to obtain a thin bar-shaped molded product, in the prior art, the maximum flow distance of the molten metal was equal to the total length of the sleeve, the runner, and the molded product. Or less than half of the length of the molded product. As is clear from this example, in the present invention, it is not necessary to inject the molten metal under high pressure and high speed conditions in order to prevent the filling failure in the cavity. It is possible to obtain a high-quality molded product by injecting a molten metal that is clean and has no temperature drop at a low pressure. In addition, since the runner or overflow that plays the role of distributing the molten metal, removing inclusions in the molten metal, and removing the initial supercooled molten metal becomes unnecessary, the yield of the product can be greatly improved.
Furthermore, since the molten metal is supplied to the die casting machine using the heat insulation container, there is no need to form a supply flow path through which the molten metal flows, and a complicated system for temperature management or control of the molten metal. It is possible to simplify the structure of the die casting apparatus and the control system. Furthermore, the temperature drop of the molten metal can be minimized while the molten metal is conveyed from the melting furnace to the die casting machine.
According to invention of Claim 6 and 7, it becomes possible to accommodate the heat retention container in the opening part of a die-cast machine easily and reliably.
According to invention of Claim 8 and 9, it becomes possible to inject a good quality molten metal directly in a cavity.

According to the invention described in claim 10, it is possible to supply the heat retaining container to the opening in a state where the movable mold is separated from the fixed mold.
According to the invention of claim 11, it is possible to use a heat retaining container having a desired axial length dimension.
According to the invention of claim 12, the plunger tip can exhibit the functions of injection, pressurization and extrusion. Therefore, the structure of the die casting apparatus can be simplified as compared with the prior art.
According to the thirteenth aspect of the present invention, it is possible to suck the air in the cavity from the pipe and reduce the pressure in the cavity. When the pressure is reduced, the air flow toward the pipeline passes around the heat insulating container, and does not cause a problem of sucking the molten metal. Therefore, it is possible to perform suitable gas venting before and during the molten metal injection. Furthermore, since the molten metal inside the heat-insulating capsule is difficult to be cooled, it is possible to take a long suction time, and it is possible to ensure a much higher vacuum state in the cavity as compared with the prior art. That is, in the prior art, it is necessary to perform an immediate injection process after pouring, so the suction time is inadequate and the amount of leakage is large due to the complexity of the mold structure. Due to the generation of gas from the agent, the degree of vacuum was about 0.5 to 0.1 atmosphere, but according to the present invention, a high vacuum pressure of 0.1 to 0.01 atmosphere or less can be achieved. It becomes. Due to this high vacuum, it is possible to perform the vacuum degassing process conventionally performed in the melting step in the die casting machine, and it is possible to inject a very high quality molten metal directly into the cavity.

According to invention of Claim 14, it becomes possible to shape | mold the molded product of various shapes and take out from a die-casting machine.
According to the fifteenth aspect of the present invention, the air in the cavity can be sucked from the flow path and the inside of the cavity can be decompressed. When the pressure is reduced, the air flow toward the flow path passes around the heat insulating container, and does not cause a problem of sucking the molten metal. Therefore, it is possible to perform suitable gas venting before and during the molten metal injection. Furthermore, since the molten metal inside the heat insulating container is difficult to be cooled, it is possible to take a long suction time, and it is possible to ensure a much higher vacuum state in the cavity as compared with the prior art. That is, in the prior art, it is necessary to perform an immediate injection process after pouring, so the suction time is inadequate and the amount of leakage is large due to the complexity of the mold structure. Due to the generation of gas from the agent, the degree of vacuum was about 0.5 to 0.1 atmosphere, but according to the present invention, a high vacuum pressure of 0.1 to 0.01 atmosphere or less can be achieved. It becomes. Due to this high vacuum, it is possible to perform the vacuum degassing process conventionally performed in the melting step in the die casting machine, and it is possible to inject a very high quality molten metal directly into the cavity.

According to the invention of the sixteenth aspect, it is possible to suitably execute the removal of the molded product and the subsequent conveyance to the subsequent process.
According to the seventeenth aspect of the present invention, it is possible to suitably perform separation of the molded product from the mold.
According to the eighteenth aspect of the present invention, it is possible to suitably extrude the die-cast product from the cavity using the plunger tip.
According to the nineteenth aspect of the present invention, it is possible to integrally manufacture a large molded product by optimally arranging a plurality of plunger tips at necessary positions.
According to the invention described in claims 20 to 22, it is possible to collect parameter data of manufacturing process conditions in each molding process before injection, during injection, and after injection.
According to the invention of claim 23, the actuator can be controlled based on the parameter data of the manufacturing process conditions in each molding process before injection, in the middle of injection, and after injection, and molding is performed under precise control. be able to.
According to the invention described in claims 24 to 26, it is possible to realize suitable injection, pressurization and extrusion.
According to the twenty-seventh to thirty-sixth aspects, high fluidity of the molten metal in the cavity can be ensured.
According to the thirty-seventh aspect of the present invention, it is possible to easily remove the heat retaining container from the molded die-cast product, and it is possible to easily reduce the weight of the die-cast product.
According to the invention of claim 38, it is possible to minimize the temperature drop of the molten metal.

According to the thirty-ninth aspect of the present invention, since the molten metal is supplied to the die casting machine using the heat retaining container, the temperature of the molten metal is hardly lowered, and injection under low speed and low pressure conditions is possible. Therefore, it is possible to obtain a high-quality thin die-cast product free from casting defects such as entrainment and shrinkage.
In addition, in order to adopt a method of injecting the molten metal by accommodating the insulating container in the opening formed in the die casting machine and then compressing and breaking the insulating container using the plunger tip, the injection of the molten metal is performed. Since it can be performed at a desired position, the flow path of the molten metal in the cavity can be shortened. Therefore, it is possible to obtain a large thin molded product such as an automobile body. For example, when trying to obtain a thin bar-shaped molded product, in the prior art, the maximum flow distance of the molten metal was equal to the total length of the sleeve, the runner, and the molded product. Or less than half of the length of the molded product. As is clear from this example, in the present invention, it is not necessary to inject the molten metal under high pressure and high speed conditions in order to prevent the filling failure in the cavity. It is possible to obtain a high-quality molded product by injecting a molten metal that is clean and has no temperature drop at a low pressure. In addition, since the runner or overflow that plays the role of distributing the molten metal, removing inclusions in the molten metal, and removing the initial supercooled molten metal becomes unnecessary, the yield of the product can be greatly improved.

According to the invention described in claims 40 and 41, it is possible to easily and reliably accommodate the heat retaining container in the opening of the die casting machine.
According to the invention of claim 42, it is necessary to form a supply channel through which the molten metal flows as in the prior art by providing a step of transporting the heat retaining container for storing the molten metal from the pouring device to the die casting machine. Therefore, a complicated system for temperature management or control of the molten metal is not required, and the structure of the die casting machine and the control system can be simplified.
According to the invention of claim 43, the temperature drop of the molten metal can be minimized while the molten metal is conveyed to the die casting machine.
According to the inventions described in claims 44 and 45, it is possible to inject a high-quality molten metal directly into the cavity.
According to the inventions of claims 46 and 47, it is possible to perform the vacuum degassing process in the die casting machine, and it is possible to inject a very high quality molten metal directly into the cavity.
According to the inventions of claims 48 and 49, the injection process can be controlled based on the parameter data of the manufacturing process conditions in each molding process before injection, in the middle of injection, and after injection, and molding under precise control Processing can be performed.
According to the invention of claim 50, it is possible to suitably take out the molded product from the die casting machine.
According to the inventions of claims 51 and 52, it is possible to suitably separate the molded product from the mold.
According to the invention of claim 53, it is possible to suitably take out the molded product from the die casting machine.
According to the invention of claim 54, it becomes possible to mold molded products of various shapes and take them out of the die casting machine.
According to the invention of claim 55, it is possible to suitably separate the mold and the molded product in the next molding cycle.

It is a block diagram which shows the structure of the die-casting apparatus which concerns on this invention. 3 is a flowchart of a die casting method according to the present invention. It is a longitudinal cross-sectional view which shows one Embodiment of the heat retention container used for the die-casting method of this invention, and the cylinder for a holding | grip. It is a longitudinal cross-sectional view which shows other embodiment of the heat retention container used for the die-casting method of this invention, and the cylinder for a holding | grip. It is a figure explaining the melt | dissolution process and pouring process of the die-casting method which concerns on this invention. It is a figure explaining the control form in the pouring process of the die-casting method which concerns on this invention. It is a layout figure of the conveyance apparatus of a die-casting apparatus of this invention, and a heat retention furnace. It is a figure which shows the holding | grip supply apparatus which comprises the die-casting apparatus of this invention. It is a figure which shows the process in which the holding | grip supply apparatus picks up the heat retention container on a conveying apparatus. It is a figure which shows the die-casting machine which comprises the die-casting apparatus of this invention. It is a figure explaining the toggle mechanism of the die-casting machine which comprises the die-casting apparatus of this invention. It is a figure explaining the structure of the extrusion pin of the die-casting machine which comprises the die-casting apparatus of this invention. It is a figure explaining the supply process of the die-casting method which concerns on this invention. It is a longitudinal cross-sectional view which shows one Embodiment of the filter used for the die-casting method of this invention. It is a figure which shows the process of attaching a filter to a heat retention container. It is a flowchart of the injection | emission process of the die-casting method which concerns on this invention. It is sectional drawing which shows an example of the die-cast product obtained from the die-casting method which concerns on this invention. It is a top view of the fixed metal mold | die of the die-casting machine which comprises the die-casting apparatus of this invention. It is a figure explaining the control form of the die-casting machine which comprises the die-casting apparatus of this invention. It is a figure explaining the taking-out apparatus used for the taking-out process of the die-casting method of this invention. It is a figure which shows an example of the die-casting machine provided with an auxiliary runner. It is a top view of the fixed metal mold | die of the die-cast machine shown in FIG. It is a figure which shows other embodiment of a filter. It is a figure which shows the state after the supply process using the die-cast machine shown in FIG. 21, and the filter shown in FIG. It is a figure which shows the state after the injection | emission process using the die-cast machine shown in FIG. 21, and the filter shown in FIG. It is a figure which shows the die-cast product obtained through the injection process shown in FIG. It is a figure which shows the state which removed the heat insulation container from the die-cast product shown in FIG. It is a figure which shows the state which removed the ring member from the die-cast product shown in FIG. It is a figure which shows an example of the conventional die-casting apparatus.

Hereinafter, embodiments of a die casting apparatus and a die casting method according to the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a die casting apparatus of the present invention.
The die casting apparatus (1) includes a melting furnace (2) having a heater or a gas burner for melting metal, and a pouring apparatus (3) for pouring a molten metal made of the metal melted in the melting furnace (2). A conveying device (4) for conveying the molten metal poured by the pouring device (3), a heat retaining furnace (5) for keeping the molten metal conveyed by the conveying device (4), and a conveying device (4 ) Is provided with a gripping and feeding device (6) for supplying molten metal to the die casting machine (7), and a take-out device (8) for taking out a molded product molded by the die casting machine (7) from the die casting machine (7).

FIG. 2 is a flowchart of the die casting method according to the present invention.
The die casting method includes a melting step of melting a metal to obtain a molten metal, a pouring step of pouring the molten metal, a conveying step of conveying the poured molten metal to the gripping and feeding device (6), and a die casting. A supply process of supplying the molten metal to the machine (7), a mold closing process of clamping the die casting machine (7), an injection process of injecting the molten metal into the cavity of the die casting machine (7), and a die casting machine (7) The mold opening process which isolate | separates a molded product from this metal mold | die, and the taking-out process which takes out a molded product from a die-cast machine (7).
In the melting step, a melting furnace (2) is used. In the pouring process, a pouring device (3) is used. In the transfer process, a transfer device (4) is used. In the supply process, a gripping supply device (6) and a die casting machine (7) are used. In the injection process and the mold opening process, the die casting machine (7) operates. In the take-out process, a take-out device (8) and a die casting machine (7) are used.

FIG. 3 shows the heat retaining container (9) and the gripping cylinder (92) used in the pouring process. 3 (a) is a longitudinal sectional view of the heat retaining container (9), FIG. 3 (b) is a longitudinal sectional view of the gripping cylinder (92), and FIG. 3 (c) is a perspective view of FIG. It is a longitudinal cross-sectional view which shows the state which made the thermal insulation container (9) shown to a) the fitting cylinder (92) shown in FIG.3 (b) externally fit.
The heat-retaining container (9) shown in FIG. The upper surface of the heat insulation container (9) is parallel to the bottom surface of the heat insulation container (9).
The heat insulating container (9) is made of a molded body made of a heat-resistant ceramic fiber, and the molten metal filled in the heat insulating container (9) does not leak through the peripheral wall portion or the bottom of the heat insulating container (9).
The gripping cylinder (92) has a cylindrical shape opened up and down, and the upper and lower edges of the gripping cylinder (92) are parallel to each other. The inner diameter of the gripping cylinder (92) is substantially equal to the outer diameter of the heat retaining container (9), and the gripping cylinder (92) can accommodate the heat retaining container (9). The axial length of the gripping cylinder (92) is longer than the axial length of the heat retaining container (9).

FIG. 4 shows another embodiment of the heat retaining container (9) and the gripping cylinder (92). 4 (a) is a longitudinal sectional view of the heat retaining container (9), FIG. 4 (b) is a longitudinal sectional view of the gripping cylinder (92), and FIG. 4 (c) is a perspective view of FIG. It is a longitudinal cross-sectional view which shows the state which externally fitted the cylinder (92) for holding | grip shown in FIG.4 (b) to the heat retention container (9) shown to a).
The heat insulating container (9) shown in FIG. 4 (a) has a cylindrical shape with one end, and unlike the heat insulating container (9) shown in FIG. 3, the upper surface edge is not inclined. On the other hand, the gripping cylinder (92) shown in FIG. 4 (b) has a cylindrical shape, but unlike the gripping cylinder (92) shown in FIG. . When the gripping cylinder (92) is externally fitted to the heat retaining container (9), the projecting portion (921) projects from the upper edge of the heat retaining container (9).
As shown in FIG. 3 and FIG. 4, various forms can be applied to the heat retaining container (9) and the gripping cylinder (92) used in the present invention, and the forms shown in this specification. Is just an example.

FIG. 5 is a diagram for explaining the melting step and the pouring step. Fig.5 (a) is the figure which looked at the melting furnace (2) and the pouring apparatus (3) used for a melting process and a pouring process from the side, FIG.5 (b) is a melting process and pouring. It is the figure which looked at the melting furnace (2) and pouring apparatus (3) used for a process from upper direction.
FIG. 5 shows a melting furnace (2). A raw material charging opening (21) is formed on the upper surface of the melting furnace (2). From the raw material charging opening (21), a metal material for die casting such as aluminum or magnesium is charged. The melting furnace (2) includes a heater or a gas burner inside, and the internal space of the melting furnace (2) has a temperature higher than the melting point of the raw material to be charged.
In the melting step, when electric power is supplied to the melting furnace (2) or gas is ignited, the inner space of the melting furnace (2) is heated. As a result, the metal material charged into the melting furnace (2) is melted inside the melting furnace (2) and becomes liquid.

The pouring device (3) includes a pipe (31) communicating with the internal space of the melting furnace (2) and a pump (32) such as an electromagnetic pump or a pneumatic pump attached to the middle of the pipe (31). The pipe (31) is an elbow pipe, and the tip of the pipe (31) opens downward.
The conveying device (4) passes below the tip of the pipe line (31). The conveying device (4) is a belt conveyor, and is placed on the belt of the conveying device (4) in a state where a plurality of heat retaining containers (9) and a gripping cylinder (92) are combined ( (Refer FIG.4 (b)).
A proximity sensor (33) is disposed in the vicinity of the transport device (4). The proximity sensor (33) includes a light emitting unit (331) that emits laser light and a light receiving unit (332) that receives the laser light from the light emitting unit (331). The light emitting unit (331) and the light receiving unit (332) are arranged to face each other, and the belt of the transport device (4) passes between the light emitting unit (331) and the light receiving unit (332). The optical path of the laser light emitted from the light emitting section (331) passes below the tip opening of the pipe (31), and the heat retaining container (9) and the gripping cylinder (92) on the transport device (4) are provided. If it exists below the front-end opening part of a pipe line (31), the optical path of a laser beam will be interrupted | blocked by the heat retention container (9) and the cylinder (92) for a holding | grip.

FIG. 6 is a diagram illustrating a signal flow in the pouring process.
When the optical path of the laser beam between the light emitting section (331) and the light receiving section (332) is blocked by the heat retaining container (9) and the gripping cylinder (92), the proximity sensor (33) is connected to the control panel (10). A signal is transmitted (S11). When receiving a signal from the sensor (33), the control panel (10) transmits a stop signal to the drive motor (41) that drives the transport device (4), and stops the drive motor (41) (S12). The drive motor (41) incorporates an encoder, and the control panel (10) confirms the stop of the drive motor (41) based on a signal from the encoder (S13). After confirming that the drive motor (41) has stopped, the control panel (10) transmits a signal to the pump (32) to operate the pump (32) (S14).
When the pump (32) is operated, the molten metal in the melting furnace (2) flows out from the tip of the pipe line (3) due to the liquid pressure. A flow meter (34) is attached in the middle of the pipe line (3), and the flow rate of the molten metal flowing out from the opening of the pipe line (3) is measured by the flow meter (34). It is sent to the control panel (10) (S15). A predetermined threshold for the flow rate of the molten metal flowing out from the pipe line (3) is input to the control panel (10), and the flow rate of the molten metal after the pump (32) is in the operating state is input. If the threshold value is exceeded, a signal is transmitted to the pump (32), and the pump (32) is stopped (S16).
After stopping the pump (32), the control panel (10) sends a signal to the drive motor (41) to operate the drive motor (41) (S17). Thereafter, the next heat retaining container (9) and the gripping cylinder (92) arranged on the belt of the conveying device (4) block the optical path of the laser light between the light emitting part (331) and the light receiving part (332). Then, the above operation is executed again.

  Through the process described in relation to FIG. 6, a predetermined amount of molten metal is accommodated in the heat retaining container (9) that has passed through the pipe (3) below the tip opening. The heat retaining container (9) supplied with the molten metal is transported downstream from directly under the opening of the pipe (3) tip by the operation of the drive motor (41) of the transport device (4).

FIG. 7 is a schematic plan view of the transfer device (4).
A heat insulation furnace (5) is arranged downstream of the pipe line (3), and the belt of the transport device (4) passes through the internal space of the heat insulation furnace (5). The interior space of the heat retaining furnace (5) is at a temperature higher than the temperature of the metal material forming the molten metal, and the fluidity of the molten metal in the heat retaining container (9) is prevented from being lowered.
The heat retaining container (9) and the gripping cylinder (92) that have passed through the heat retaining furnace (5) are supplied to the die casting machine (7) by the gripping supply device (6).

FIG. 8 shows a gripping and feeding device (6) used in the feeding process. FIG. 8A is a view of the grip supply device (6) as viewed from the side, and FIG. 8B is a view of the grip supply device (6) as viewed from the bottom.
The gripping and feeding device (6) includes a disk-shaped base (61). A connection part (62) is provided at the center of the upper surface of the base part (61), and the connection part (62) is connected to the articulated arm robot. By the operation of the articulated arm robot, the grip supply device (6) can be arranged at a desired position in the three-dimensional space. Further, by the operation of the articulated arm robot, the base part (61) can rotate around the base part (61) axis with the connection part (62) as an axis.
A pair of groove portions (63) are formed on the lower surface of the base portion (61) along the diameter of the base portion (61). The pair of groove portions (63) are aligned on one line, and the line connecting the pair of groove portions (63) passes through the center point of the base portion (61). The inner ends of the pair of groove portions (63) are spaced apart from each other with the center point of the base portion (61) interposed therebetween. A rod-shaped inner member (64) is fixed to the inner ends of the pair of grooves (63), and the inner member (64) extends downward.
A rod-shaped outer member (65) is disposed in each of the pair of grooves (63). The outer member (65) is movable along the groove (63).
A piston cylinder (66) is fixed to each of the outer ends of the pair of grooves (63). The tip of the rod (661) of the piston cylinder (66) is connected to the outer member (65). The outer member (65) moves along the groove (63) by operating the piston cylinder (66) and expanding and contracting the rod (661).
Of the set of the inner member (64) and the outer member (65) of the gripping and feeding device (6) shown in FIG. 8, one set (set shown on the left side) is more than the other set (set shown on the right side). Is also formed long.

FIG. 9 is a diagram illustrating a process in which the grip supply device (6) picks up the heat retaining container (9) and the gripping cylinder (92) on the transport device (4).
First, the articulated arm robot is operated to move the gripping and feeding device (6) above the heat retaining container (9) immediately after passing through the heat retaining furnace (5). Thereafter, the multi-indirect arm robot is further operated to move the base portion (61) downward. At this time, the inner member (64) having a long dimension contacts the inner wall surface of the heat retaining container (9), and the inner member (64) having a shorter dimension contacts the inner wall surface of the gripping cylinder (92). Thereafter, the piston cylinder (66) is operated to move the outer member (65) toward the center of the base part (61). As a result, the pair of the longer inner member (64) and the outer member (65) sandwiches the heat retaining container (9) and the gripping cylinder (92), and the shorter inner member (64) and the outer member (65) The set of members (65) sandwiches only the gripping cylinder (92). While maintaining this state, the multi-indirect arm robot is further operated to move the gripping and feeding device (6) toward the die casting machine (7).

FIG. 10 is a schematic view of the die casting machine (7).
The die casting machine (7) includes a movable mold (71) and a fixed mold (72) disposed below the movable mold (71). A cavity (73) is formed between the movable mold (71) and the fixed mold (72).
The guide rod (74) passes through the vicinity of the periphery of the movable mold (71) and the fixed mold (72). The movable mold (71) is guided by the guide rod (74) and can be moved up and down. A support member (741) protruding in the radial direction of the guide rod (74) is attached to the middle portion of the guide rod (74), and the support member (741) supports the fixed mold (72) from below.

An upper plate (75) is disposed above the movable mold (71). The upper plate (75) is attached to the upper portion of the guide rod (74) and is held up and down by a support member (742) projecting in the radial direction of the guide rod (74), and is fixed at the upper position of the guide rod (74). Yes.
A toggle mechanism (76) is constructed above the movable mold (71). The toggle mechanism (76) is connected to the motor (761) fixed to the center of the upper surface of the upper plate (75) and the motor (761) and penetrates the upper plate (75) and extends below the upper plate (75). A ball screw (762) to be ejected, a driver (763) screwed into the ball screw (762), a pair of first link mechanisms (764) extending from the driver (763) to the left and right, a first The second link mechanism (765) is connected to the driver (763) via the link mechanism (764) and extends vertically between the lower surface of the upper plate (75) and the upper surface of the movable mold (71). Consists of.

FIG. 11 is a diagram showing a state of the die casting machine (7) during the mold opening process.
In the mold opening process, the motor (761) is operated. With the operation of the motor (761), the ball screw (762) rotates, and the driver (763) screwed with the ball screw (762) moves upward. As the driver element (763) rises, the connection point (641) between the first link mechanism (764) and the driver element (763) moves upward, and the link rod ( 642) rotates downward about the connection point (641). As a result, the connection point (643) of the first link mechanism (764) and the second link mechanism (765) moves obliquely inward and upward.
An upper link bar (651) that is connected to the upper plate (75) and constitutes the second link mechanism (765), is positioned below the upper link bar (651), and has one end at the lower end of the upper link bar (651) The connection point (653) of the lower link rod (652) that is rotatably connected is positioned in the vicinity of the connection point (643) between the first link mechanism (764) and the second link mechanism (765). In the embodiment shown in FIGS. 10 and 11, the connection point (643) is provided in the vicinity of the lower end of the upper link rod (651).
As the connection point (643) moves inward and upward, the upper link bar (651) and the lower link bar (652) bend around the connection point (653). As described above, since the upper plate (75) is fixed in the vicinity of the upper end of the guide rod (74), the movable die (71) is bent by bending between the upper link rod (651) and the lower link rod (652). Is guided by the guide rod (74) and moves upward. As a result, the movable mold (71) is separated from the fixed mold (72), and the mold is opened.

10 and 11 schematically show the push pin (711) attached to the movable mold (71). The lower end of the push pin (711) appears on the upper surface of the cavity (73). The push pin (711) penetrates the movable mold (711) and protrudes from the upper surface of the movable mold (71).
FIG. 12 shows the detailed structure around the push pin (711).
The movable mold (71) is formed with a two-stage cylindrical through hole (712) that accommodates the lower portion of the push pin (711). The through hole (712) is formed with a large diameter on the lower surface side of the movable mold (71).
The extrusion pin (711) penetrates the movable mold (71) and is coupled to the extrusion pin main body portion (111) having a complementary shape to the through hole (712) at the lower portion and the upper end of the main body portion (111). And a plunger rod (112) extending upward, a cylindrical support member (113) fixed to the upper surface of the movable mold (71) and surrounding the upper portion of the main body (111), and inside the support member (113) A spring member (114) that is disposed and biases the plunger rod (112) upward is provided.
The support member (113) includes a cylindrical portion (131) extending upward and a disk-shaped fixing portion (132) extending radially from the outer peripheral surface of the lower end of the cylindrical portion (131). The lower surface of the fixed portion (132) is in contact with the upper surface of the movable mold (71). An O-ring (133) is arranged at the boundary between the fixed part (132) and the movable mold (71). The upper end of the cylindrical part (131) is located above the connection part of the main body part (111) and the plunger rod (112), and the cylindrical part (131) surrounds the lower end of the plunger rod (112). An O-ring (134) is disposed between the outer peripheral surface of the plunger rod (112) and the inner peripheral surface of the cylindrical portion (131).

A slight gap is formed between the peripheral surface of the main body (111) penetrating the movable mold (71) and the inner peripheral surface of the through hole (712) of the movable mold (71). The size of the gap is such that air can flow and the molten metal does not flow. The gap between the main body (111) and the through hole (712) communicates with the space defined by the inner peripheral surface of the support member (113) and the two O-rings (133, 134).
The support member (113) further includes a tubular body (135) penetrating the peripheral wall of the cylindrical portion (131). One end of the tube (135) is connected to a vacuum generator (not shown). When the vacuum generator is operated, the gas in the cavity (73) is separated from the gap between the main body (111) and the through hole (712), the inner peripheral surface of the support member (113), and the two O-rings (133, 134). Is sucked out of the die casting machine (7) through the space defined by

The outer diameter of the plunger rod (112) is slightly smaller than the inner diameter of the cylindrical portion (131), but larger than the upper diameter of the main body portion (111). The upper end of the spring member (114) is in contact with the lower surface of the plunger rod (112), and the lower end of the spring member (114) is in contact with the upper surface of the movable mold (71).
The upper end of the plunger rod (112) is connected to a hydraulic cylinder (not shown), and is pushed downward by the operation of the hydraulic cylinder. Since the spring member (114) urges the plunger rod (112) upward, when the pressure from the hydraulic cylinder decreases, the plunger rod (112) moves upward.

Refer to FIG. 10 again.
A lower plate (77) is disposed below the fixed mold (72). The lower part of the guide rod (74) penetrates the lower plate (77), and the lower plate (77) is attached to the lower end of the guide rod (74) by using a support member (743) arranged at the lower end of the guide rod (74). Fixed.
A plurality of injectors (78) are arranged between the lower plate (77) and the fixed mold (72).

The injector (78) includes an electric servo cylinder (781) fixed to the upper surface of the lower plate (77), and a cylindrical sleeve whose lower end is connected to the electric servo cylinder (781) and whose upper end appears on the lower surface of the cavity (73). (782) and a plunger tip (783) housed in the sleeve (782) and supported at the lower end by the rod (811) of the electric servo cylinder (781).
The sleeve (782) includes a disk-shaped fixing portion (821) extending in the radial direction from the outer peripheral surface of the lower end, and the fixing portion (821) is attached to the housing portion (812) of the electric servo cylinder (781). It is fixed using appropriate fixing means such as screws.
The sleeve (782) includes a disk-shaped fixing portion (822) extending in a radial direction from an upper outer peripheral surface of the sleeve (782). It is fixed using fixing means.
In this way, the sleeve (782) is fixed between the lower plate (77) and the fixed mold (72).

An opening is formed in the fixed mold (72), and the cylindrical portion of the sleeve (782) above the fixed section (822) is inserted into the opening of the fixed mold (72).
The axial length dimension of the plunger tip (783) is shorter than the axial length dimension of the sleeve (782). When the rod (811) of the electric servo cylinder (781) is retracted into the casing (812), a space is formed between the upper end surface of the sleeve (782) and the upper end surface of the plunger tip (783). Is done. The heat retaining container (9) is accommodated in this space.
The plunger tip (783) has a substantially cylindrical shape, but the upper and lower portions of the plunger tip (783) are formed larger in diameter than the intermediate portion in the axial direction of the plunger tip (782), and from the circumferential direction of the plunger tip (782). When viewed, it is I-shaped. A slight gap is formed between the large diameter peripheral surface of the upper portion of the plunger tip (783) and the inner peripheral surface of the sleeve (782). The gap is sized such that air can flow but the molten metal does not flow in. An O-ring (784) is disposed between the large diameter portion on the lower side of the plunger tip (783) and the inner peripheral surface of the sleeve (782).

  The sleeve (782) includes a conduit (823). One end of the pipe line (823) passes through the peripheral wall of the sleeve (782). The other end of the pipe line (823) is connected to a vacuum generator (not shown). When the vacuum generator is activated, the gas in the cavity (73) is passed through the space above the sleeve (782) and the gap between the plunger tip (783) peripheral surface and the sleeve (782) internal peripheral surface. 7) to the outside.

FIG. 13 is a diagram illustrating the final stage of the supply process. The die casting machine (7) shown in FIG. 13 is in a state after the mold opening process described in relation to FIG. 11, and the movable mold (71) is separated from the fixed mold (72).
By operating the articulated arm robot, the gripping and feeding device (6) is moved to the space between the lower surface of the movable mold (71) and the upper surface of the fixed mold (72). Thereafter, the articulated arm robot is further operated to move the gripping and feeding device (6) downward, and the warming container (9) gripped by the gripping and feeding device (6) is moved from the upper end opening of the sleeve (782) to the sleeve ( 782).
After inserting a part of the heat retaining container (9) into the sleeve (782), the piston cylinder (66) on the side sandwiching the peripheral wall of the heat retaining container (9) is operated, and the outer side connected to the piston cylinder (66) The member (65) is moved away from the inner member (64). As a result, gripping of the gripping and feeding device (6) with respect to the heat retaining container (9) is released, the heat retaining container (9) falls into the sleeve (782), and the upper surface of the plunger tip (783) and the inner wall of the sleeve (782) It is accommodated in the space surrounded by.
During this period, the pair of the outer member (65) and the inner member (64) having a short dimension continues to grip the peripheral wall of the gripping cylinder (92). Therefore, after the thermal insulation container (9) is dropped into the sleeve (782) and then the articulated arm robot is operated to raise the grip supply device (6), the gripping cylinder (92) is gripped and supplied. Ascending with the device (6), the lower part of the gripping cylinder (92) is detached from the opening of the sleeve (782). In this state, the articulated arm robot is operated to detach the gripping and feeding device (6) from the space between the lower surface of the movable mold (71) and the upper surface of the fixed mold (72). The gripping cylinder (92) gripped by the gripping and feeding device (6) is then stored in a predetermined storage location.
After the heat retaining container (9) is accommodated in a space surrounded by the upper surface of the plunger tip (783) and the inner wall of the sleeve (782), the upper end opening of the heat retaining container (9) is closed by a filter.

FIG. 14 is a cross-sectional view of a filter (91) for filtering out impurities contained in the molten metal in the heat retaining container (9).
The filter (91) includes a disk-shaped plate-shaped filter main body (911) and a thin wire member (912) that penetrates the filter main body (911). The upper end of the wire member (912) protrudes from the filter main body (911). The lower end of the wire member (912) is bifurcated and extends along the lower surface of the filter main body (911).
The filter main body (911) is a porous body provided with a large number of openings having a diameter of 0.5 mm or less, and can filter impurities such as aluminum oxide present in the molten metal. The filter body (911) may be formed of the same material as that of the heat retaining container (9), or may be formed of a porous ceramic filter or a wire mesh.

FIG. 15 is a diagram illustrating a process of attaching a filter using the filter attachment device.
The filter support part (350) of the filter mounting device includes a piston cylinder (351) and a support cylinder (353) connected to the lower end of the rod (352) of the piston cylinder (351).
The upper end of the piston cylinder (351) can be connected to an arm (not shown) of an articulated arm robot constituting the filter mounting device, and can be arranged at a desired three-dimensional space position. The axis of the piston cylinder (351) extends in the vertical direction, and the rod (352) can be expanded and contracted in the vertical direction.
An annular balloon member (531) is disposed inside the lower end of the support tube (353). Air can be supplied to the balloon member (531). When air is supplied to the balloon member (531), the balloon member (531) expands, and the inner diameter of the balloon member (531) decreases.

The multi-joint arm robot is operated, the filter support (350) is arranged above the filter (91), and the upper end of the wire member (912) is inserted through the opening of the balloon member (531). Thereafter, air is supplied to the balloon member (531) to inflate the balloon member (531), so that the filter support portion (350) supports the filter (91). Thereafter, the articulated arm robot is operated to move the filter support (350) toward the die casting machine (7).
As described with reference to FIG. 13, the movable mold (71) of the die casting machine (7) is in a state of being separated from the fixed mold (72), and the upper surface of the plunger tip (783) and the inner wall of the sleeve (782). A heat insulating container (9) is accommodated in the space surrounded by.
The filter support (350) moved toward the die casting machine (7) is disposed between the fixed mold (71) and the movable mold (72), and is positioned above the upper end opening of the sleeve (782). Thereafter, the articulated arm robot is operated to extend the rod (352). Thereby, the filter (91) supported by the filter support portion (350) closes the upper end opening of the sleeve (782).
When the attachment of the filter (91) to the upper end opening of the sleeve (782) is completed, the valve provided in the middle of the air supply path to the balloon member (531) is opened, and the air inside the balloon member (531) is removed. Released to the outside. As a result, the wire member (912) is released from the support tube (353). When the filter support (350) is moved upward in this state, the filter (91) is separated from the filter support (350) while being attached to the upper end opening of the sleeve (782).

As shown in FIG. 2, after the supply process is completed, a mold closing process is performed. In the mold closing process, an operation opposite to the operation described with reference to FIG. 11 is performed.
The motor (761) is rotated in the opposite direction to the mold opening process. As a result, the driver (763) moves downward along the ball screw (762). As the driver (763) descends, the first link mechanism (764) pushes the second link mechanism (765) outward, and the shafts of the upper link bar (651) and the lower link bar (652). Are in line. As a result, the movable mold (71) is guided by the guide rod (74) and descends, abuts against the fixed mold (72), and a cavity is formed at the boundary between the movable mold (71) and the fixed mold (72). (73) will be formed.

As shown in FIG. 2, after the mold closing process is performed, the injection process is performed.
FIG. 16 is a flowchart showing each stage of the injection process.
The injection process includes a evacuation stage for evacuating the cavity (73), an injection stage for injecting molten metal into the cavity (73), and a cooling stage for cooling and solidifying the molten metal filling the cavity (73). .

In the evacuation stage, the vacuum generator connected to the pipes (135, 823) described with reference to FIGS. 10 and 12 is operated. As a result, the gas in the cavity (73) is sucked through the pipe lines (135, 823), and the cavity (73) is decompressed. A pressure gauge (not shown) is preferably attached to the support member (113) of the push pin (711) or the sleeve (782) of the injector (78) so that the pressure in the cavity (73) can be measured.
The pressure gauge transmits a signal to the control panel (10). A predetermined threshold value for the pressure in the cavity (73) is input to the control panel (10), and the control panel (10) until the pressure in the cavity (73) measured by the pressure gauge falls below the input threshold value. Activates the vacuum generator connected to the lines (135, 823).

The injection phase begins when the pressure in the cavity (73) falls below the threshold value entered into the control panel (10).
The control panel (10) sends an operation command signal to the electric servo cylinder (781). Upon receiving this signal, the rod (811) of the electric servo cylinder (781) extends upward. As the rod (811) extends upward, the plunger tip (783) housed in the sleeve (782) moves toward the cavity (73).
Through the supply process, the heat retaining container (9) placed on the upper surface of the plunger tip (783) rises together with the plunger tip (783) and is sandwiched between the lower surface of the movable mold (71) and the plunger tip (783). Will be. Thereafter, when the plunger tip (783) is further pushed up, the heat retaining container (9) is compressed and broken between the lower surface of the movable mold (71) and the plunger tip (783).
The molten metal accommodated in the heat insulating container (9) through the pouring step is discharged out of the heat insulating container (9) due to compression breakage of the heat insulating container (9) and flows in the cavity (73). . During the injection of the molten metal through the compression fracture of the heat insulating container (9), the filter (91) attached to the heat insulating container (9) prevents the impurities in the metal molten metal from flowing into the cavity (73).

FIG. 17: is sectional drawing of the die-cast product shape | molded by the die-casting machine (7).
As described above, the heat retaining container (9) is compressed and broken between the lower surface of the movable mold (71) and the plunger tip (783). After that, when the molten metal is cooled and solidified in the cavity (73) through a cooling stage, the heat-insulated container (9) that has been compressed and broken is integrated with the die-cast product (100), and a part of the die-cast product (100) Will be made. The heat-insulated container (9) that has been subjected to compression fracture appears as a thick portion (101) on the die-cast product (100). Due to the presence of the filter (91), the thick part (101) contains more impurities in the molten metal than the other part, but the part has a larger thickness than the other part. Therefore, there is no problem in strength.
The appearance problem can be solved by using the die-cast product (100). For example, when the die-cast product (100) is a body of an automobile, there is no problem in appearance if it is used so that the thick part (101) appears on the back of the body. Alternatively, the thick portion (101) can be removed by cutting within a range where the mechanical strength is allowed.
In the present invention, since a large-sized die-cast product (100) of a lightweight metal can be integrally formed, even if the weight of a part of the die-cast product (100) is increased by the raised portion, the overall weight reduction effect is achieved. The contribution to is great.

FIG. 18 is a plan view of the fixed mold (72).
A concave region (721) is formed in the central region of the upper surface of the fixed mold (72). The peripheral edge of the concave region (721) constitutes the peripheral edge of the cavity (73). A heat-resistant O-ring (722) is attached so as to surround the periphery of the recessed area (721). An upper edge of the sleeve (782) appears inward from the recessed area (721).

The attachment position of the sleeve (782) is not particularly limited. In the present invention, compared with the conventional die casting apparatus, the injection position of the molten metal has great flexibility, and the sleeve (782) is arranged at the final solidification position where the molten metal solidifies most slowly, Can be arranged at a position where the flow distance is the shortest. Alternatively, the sleeve (782) can be disposed at a position where the most force is required to separate the die-cast product (100) molded in the cavity (73) from the stationary mold (72).
Further, the inner diameter of one sleeve (782) may be different from the inner diameter of the other sleeve (782). A small-capacity thermal insulation container (9) may be accommodated in the small-diameter sleeve (782), and a large-capacity thermal insulation container (9) may be accommodated in the large-diameter sleeve (782).
These sleeves (782) are arranged and dimensioned according to the shape of the cavity (73), the pressure in the cavity (73), the volume of the molten metal in the heat insulating container (9) and the metal species, the temperature in the cavity (73). It may be made based on the result of the flow analysis simulation using the parameters such as. In the illustrated example, the sleeve (782) is disposed inward of the concave region (721). However, depending on the result of the flow analysis simulation, the sleeve (782) is disposed in the outer region of the concave region (721). It is also possible to connect the upper end opening of the sleeve (782) and the recessed area (721) by a narrow groove.

FIG. 19 is a diagram showing an outline of a control form of the die casting machine (7).
A temperature sensor, a position sensor, a pressure reduction sensor, and a pressure sensor are attached to the die casting machine (7), and these sensors transmit signals to the control panel (10). The control panel (10) controls the operation of the electric servo cylinder (781) and the mold closing / opening motor (761).

The position sensor (791) detects the position of the plunger tip (783), and transmits a signal corresponding to the position of the plunger tip (783) to the control panel (10). The control panel (10) receives a signal from the position sensor (791), and grasps the current position of the plunger tip (783) based on the received signal. Then, the difference between the position of the plunger tip (783) required in the next step and the current position is calculated, and the rod (811) of the electric servo cylinder (781) is expanded and contracted by a length corresponding to the calculated value.
The position sensor (791) may measure the extension length of the rod (811) of the electric servo cylinder (781) instead of detecting the position of the plunger tip (783).

As described above, the decompression sensor (792) is used for measuring the degree of vacuum in the cavity (73), and in this embodiment, is installed in the pipes (135, 823). After measuring the degree of vacuum using the decompression sensor (792) and confirming that the inside of the cavity (73) is sufficiently decompressed, the injection step can be performed.
In the prior art, even if there was a decompression failure, the injection could not be stopped and produced a defective product.In the present invention, even if a failure occurs in the decompression process, Reserve time to correct can be secured. Alternatively, it is possible to take out the heat insulating container (9) from the die casting machine (7) without moving to the injection process, and store another heat insulating container (9) in the sleeve (782), and start the injection process again. It is. Therefore, in the present invention, defective products are not produced.

  The pressure sensor (793) is disposed between the lower surface of the plunger tip (783) and the rod (811) of the electric servo cylinder (781), and is used for measuring the pressure of the molten metal filled in the cavity (73). It is done. After performing the injection step, it is determined whether or not the pressure of the molten metal in the cavity (73) measured by the pressure sensor (793) exceeds a predetermined threshold for the molten metal pressure input in advance to the control panel (10). The control panel (10) determines. When the pressure of the molten metal is below the threshold value, the control panel (10) sends a signal to the electric servo cylinder (781) so as to push up the plunger tip (783).

  The temperature sensor (794) measures the temperature of the molten metal. The state after executing the injection stage is held for a predetermined time. The temperature sensor (794) monitors the temperature of the molten metal during this period, and the control panel (10) is based on a signal received from the temperature sensor (794) and is predetermined with respect to the molten metal temperature input in advance to the control panel (10). If it is determined that the measured molten metal temperature has fallen below, a signal is sent to the motor (761) to start the mold opening process.

In the mold opening process, the operation of the die casting machine (7) described with reference to FIG. 11 is executed.
In the mold opening process, the control panel (10) sends a signal to the electric servo cylinder (781), and the electric servo cylinder (781) gradually moves the plunger tip (783) while applying vibration to the plunger tip (783). Displace upward. Although mold release resistance occurs during this process, the magnitude of this pressure depends on the shape of the die-cast product (100), the draft of the fixed mold (72), and the like. In the present invention, by giving vibration, the mold release resistance can be reduced, and the die cast product (100) is not deformed or cracked. Thereby, isolation | separation of a fixed metal mold | die (72) and a die-cast product (100) will be aimed at.
The pushing speed of the plunger tip (783) is made substantially equal to the raising speed of the movable mold (71) in the mold opening process.
When the die-cast product (100) is separated from the fixed mold (72), the control panel (10) sends a signal to the electric servo cylinder (781), moves the plunger tip (783) downward, and the mold. The opening process is completed.

  As is apparent from FIGS. 10 and 17, the die-cast product (100) of the illustrated example has a shape raised on the movable mold (71) side. In the case of such a shape, even after the die-cast product (100) is separated from the fixed mold (72), the die-cast product (100) is attached to the movable mold (71) side.

As shown in FIG. 2, after the mold opening process is performed, a removal process is performed.
FIG. 20 is a side view of the take-out device (8) used in the take-out process.
The take-out device (8) includes a plate-shaped mounting table (81) and a connecting portion (82) that protrudes from the center of the lower surface of the mounting table (81). The connection unit (82) connects to the articulated arm robot. Therefore, it is possible to arrange the take-out device (8) at a desired position in the three-dimensional space.
In the take-out process, the articulated arm robot is operated, and the take-out device (8) is arranged in the space between the fixed mold (72) and the movable mold (71) formed by the mold opening process. Thereafter, the hydraulic cylinder that drives the push pin (711) is operated to move the plunger rod (112) downward. Instead of the hydraulic cylinder, an electric servo cylinder and a plunger rod (112) may be connected in the same manner as the injector (78), and vibration may be applied to the plunger rod (112) together with a downward force.
The force transmitted to the plunger rod (112) is transmitted to the push pin main body (111), so that the die-cast product (100) and the movable mold (71) are separated.
When the die-cast product (100) is separated from the movable mold (71), it is dropped by gravity and placed on the placing table (81) of the take-out device (8) arranged below the movable mold (71). It will be.
Thereafter, the articulated arm robot is operated to move the take-out device (8) to the outside of the die casting machine (7).

  After the removal step is completed, a mold release agent is applied to the cavity (73) forming surfaces of the movable mold (71) and the fixed mold (72). Thereafter, the above-described die casting product (100) molding process cycle is repeated.

When molding thin-walled and large-sized die casting products for automobiles, a mold release agent for die casting can be used. If necessary, a movable mold (71) and a fixed mold ( It is also possible to coat the cavity (73) formation surface of 72) with a film thickness of about 100 μm. As the durable coating agent, for example, a mica or boron nitride heat-retaining aggregate using aluminum phosphate or water glass as a binder can be used. Such a durable coating agent is excellent in heat retention and stretchability, and can prevent generation of solidified pieces in the molten metal flowing in the cavity (73), poor hot water circumference, and foreign matter.
Furthermore, in order to improve the heat retaining property in the cavity (73), a surface treatment such as ceramic spraying may be applied to at least a part of the cavity (73) formation surface as necessary.

  By performing a surface treatment such as a durable coating agent and / or ceramic spraying, the fluidity of the molten metal in the cavity can be secured without using an excessive mold release agent. As a result, deposition of the release agent due to excessive use of the release agent can be prevented and casting defects can be avoided. Furthermore, an increase in the amount of gas generated due to the deposition of the release agent can be prevented, and the cavity (73) can be reliably brought into a high vacuum state.

FIG. 21 shows a die casting machine (7) having an auxiliary runner, and FIG. 22 is a plan view of a fixed mold (72) of the die casting machine (7) shown in FIG.
As shown in FIGS. 21 and 22, a groove-shaped auxiliary runner (723) may be formed on the cavity (73) forming surface of the fixed mold (72). The auxiliary runner (723) is for the purpose of promoting around the hot water and replenishing the molten metal to the solidification delay site, and its shape, arrangement, etc. are not limited to the illustrated example. In the illustrated example, the auxiliary runner (723) is formed in the fixed mold (72). However, the auxiliary runner (723) may be formed on the cavity (73) forming surface of the movable mold (71). .
The auxiliary runner (723) appears as a protrusion on the die-cast product, but this protrusion may be used as a reinforcing rib for the product, or may be mechanically cut off in a subsequent process. .
By forming the auxiliary runner (723), it is not necessary to supply molten metal at a high pressure for solidification shrinkage performed in the conventional die casting process. The surface of the auxiliary runner (723) is preferably subjected to surface treatment such as the above-mentioned durable coating agent coating or ceramic spraying.

FIG. 23 shows another embodiment of the filter (91). FIG. 23A is a cross-sectional view of the filter (91), and FIG. 23B is a bottom view of the filter (91).
The filter (91) shown in FIG. 23 further includes a ring member (913) in addition to the filter (91) described in relation to FIG. The ring member (913) is formed from two semi-annular metal plates. The ring member (913) is connected to the bottom surface of the filter main body (911). The connection between the filter main body (911) and the ring member (913) is not particularly limited. For example, a method may be employed in which a needle-like protrusion is provided on the upper surface of the ring member (913) and this protrusion is inserted into the filter body (911), or a fixing agent such as an adhesive or solder is used. May be used.

FIG. 24 shows a state in which the filter (91) shown in FIG. 23 is arranged in the die casting machine (7) using the same steps as those described in relation to FIG. The fixed mold (72) of the die casting machine (7) shown in FIG. 24 has an auxiliary runner (723).
As shown in FIG. 24, the upper edge of the sleeve (782) is located below the surface forming the cavity (73) of the stationary mold (72), and the upper edge of the stationary mold (72) and the sleeve (782). A cylindrical space is formed between the two. The outer diameter of the ring member (913) is formed approximately equal to the diameter of this cylindrical space. When the filter support (350) of the filter mounting device is moved to the die casting machine (7) and the rod (352) is extended downward, the ring member (913) is surrounded by the sleeve (782) and the fixed mold (72). The upper surface of the ring member (913) is flush with the cavity forming surface of the fixed mold (72).

FIG. 25 shows a state after the plunger tip (783) of the die casting machine (7) shown in FIG. 24 is moved upward and the molten metal in the heat retaining container (9) is injected into the cavity (73).
When the plunger tip (783) is moved upward, the heat retaining container (9) is compressed and broken between the upper surface of the plunger tip (783) and the movable mold (71). The molten metal in the heat insulating container (9) mainly flows into the cavity (73) through the gap between the semicircular metal plates constituting the ring member (913). A part of the ring member (913) remains in a cylindrical space formed between the fixed die (72) and the upper edge of the sleeve (782) even after the plunger tip (783) moves upward. A heat-insulated container (9) that has a thickness dimension sufficient to stay and is crushed by compression does not flow into the cavity (73). Accordingly, it is possible to prevent the heat retaining container (9) from being disposed at an undesired position in the die cast product.
Further, since the ring member (913) stays in the fixed mold (72) and is sandwiched between the filter main body (911) and the heat-insulated container (9) that has been compressed and broken, the ring member (913) flows in the cavity (73). Without stopping, it will stay between a heat retention container (9) and a filter main-body part (911).

FIG. 26 shows a portion of the die cast product (100) formed by the cavity (73) portion shown in FIG. Fig.26 (a) is a top view of the part of die-cast product (100), FIG.26 (b) is a front view of the part of die-cast product (100).
The die-cast product (100) shown in FIG. 26 includes a rib (123) formed by an auxiliary runner (723). As shown in FIGS. 24 and 25, when the auxiliary runner (723) is formed so as to cross the upper end opening of the sleeve (782), the heat insulating container (9), the ring member (913), and the filter main body that are compressed and broken (911) will be incorporated into the die cast product (100) across the rib (123) and will protrude from the front and back of the rib (123).
As shown in FIG. 26, the ring member (913) can be removed from the die-cast product (100) by pulling the ring member (913) to the left and right.

FIG. 27 shows a state where the ring member (913) is removed from the die-cast product (100) shown in FIG. Fig.27 (a) is a top view of the part of die-cast product (100), FIG.27 (b) is a front view of the part of die-cast product (100).
As shown in FIG. 27, after removing the ring member (913), the heat retaining container (9) is erected on the filter main body (911), and after solidification corresponding to the inner diameter portion of the ring member (913). The heat insulating container (9) is connected to the filter main body (911) via the molten metal component. By applying a bending moment to the connection portion of the heat insulating container (9), it is possible to remove the heat insulating container (9) from the die-cast product.

FIG. 28 shows a state where the heat retaining container (9) is removed from the die-cast product (100) shown in FIG. FIG. 28A is a plan view of a portion of the die-cast product (100), and FIG. 28B is a front view of the portion of the die-cast product (100).
As shown in FIG. 28, after removing the heat retaining container (9), the ring member (913) and the heat retaining container (9) used in the injection process are removed from the die-cast product (100) and are unnecessary for the die-cast product (100). These parts are completely removed.

  In this way, a narrow groove-shaped auxiliary runner (723) is formed in the movable mold (72) so as to cross the upper end opening of the sleeve (782), and the filter (91) with the ring member (913) is used. Thus, the heat retaining container (9) incorporated in the die-cast product (100) can be easily removed, and the weight of the die-cast product (100) can be reduced.

The embodiment disclosed by the above description is merely an example of the present invention, and many modifications and improvements can be constructed. For example, in the said embodiment, although the holding | grip supply apparatus (6) conveyed the single heat retention container (9) to the die-casting machine (7), several heat insulation container (9) is simultaneously made into a die-casting machine (7). The form to convey can be constructed within the technical scope of the present invention. Furthermore, although the form which moves the outer side member (65) of the holding | grip supply apparatus (6) has been demonstrated, the form which moves an inner side member (64) is also employable. In addition, the movement mode of the outer member (65) and the inner member (64) is not limited to horizontal movement, and it is also possible to perform a rotation operation around the connection portion with the base portion (61). It is included in the range.
Further, the shape of the heat retaining container (9) is not limited to that described above, and a shape in which a part of the upper edge of the heat retaining container (9) protrudes or other shapes may be employed.

  The present invention can be suitably used for molding light metals such as aluminum and magnesium.

DESCRIPTION OF SYMBOLS 1 ... Die casting apparatus 100 ... Die casting product 2 ... Melting furnace 3 ... Pouring apparatus 4 ... Conveying apparatus 5 ... Insulating furnace 6 ... ... Gripping and feeding device 7 ... Die-casting machine 8 ... Take-out device 9 ... Heat insulation container 10 ... Control panel

Claims (55)

A melting furnace for melting metal;
A pouring device for pouring the molten metal made in the melting furnace into a heat retaining container;
A gripping and feeding device for gripping and transporting the heat retaining container in which the molten metal is poured by the pouring device;
From a die-casting machine provided with one mold in which an opening for accommodating a heat insulating container conveyed by the gripping and feeding device is formed, and another mold that overlaps with the one mold and forms a cavity filled with the molten metal Become
The opening is provided with a plunger tip that reciprocates along the axial direction of the opening,
The die casting apparatus, wherein the plunger tip cooperates with the other molds to compress and break the heat retaining container and cause the molten metal to flow in the cavity. Further comprising a transport device;
2. The die casting apparatus according to claim 1, wherein the conveying device conveys the heat retaining container that stores the molten metal from the pouring device to the gripping and supplying device. Further comprising a heat retaining furnace arranged in the middle of the transport path of the heat retaining container by the transport device;
3. The die casting apparatus according to claim 1, wherein the heat retaining furnace prevents the molten metal from becoming a predetermined temperature or lower. The conveying device further conveys a gripping cylinder having both ends open;
The die casting apparatus according to any one of claims 1 to 3, wherein the gripping cylinder externally fits the heat retaining container.   The die casting apparatus according to claim 4, wherein at least a part of the opening end of the gripping cylinder does not coincide with the opening end of the heat retaining container. The gripping and feeding device moves from the transfer device to the die casting machine;
A first clamping mechanism attached to the movable base;
An inner member disposed inside the heat retaining container, the first clamping mechanism;
An outer member disposed on the outer side of the gripping cylinder that externally fits the heat retaining container;
6. The die casting apparatus according to claim 5, wherein at least one of the inner member and the outer member moves toward the other, and sandwiches the heat retaining container and the peripheral wall of the gripping cylinder at the same time. A second clamping mechanism attached to the moving base;
An inner member disposed inside the gripping cylinder that externally fits the heat retaining container;
An outer member disposed on the outer side of the gripping cylinder that externally fits the heat retaining container;
7. The die casting apparatus according to claim 6, wherein at least one of the inner member and the outer member moves toward the other, and clamps only the peripheral wall of the gripping cylinder. A filter mounting device;
The die casting apparatus according to any one of claims 1 to 7, wherein the filter attaching apparatus attaches a filter member to the opening of the die casting apparatus. A filter attachment device for conveying the filter to the die casting machine;
The filter is composed of a filter main body for filtering impurities in the molten metal and a ring member made of a pair of semi-annular plate materials,
At least a part of the ring member can be fitted into an end of the opening of the die casting apparatus,
8. The die casting according to claim 1, wherein when the filter mounting device conveys the filter to the die casting machine, the filter at least partially closes the opening of the one mold. 9. apparatus. The one mold is a fixed mold, and the other mold is a movable mold;
The die casting according to any one of claims 1 to 9, wherein the movable mold moves between a first position in contact with the fixed mold and a second position separated from the fixed mold. apparatus.   11. The die casting apparatus according to claim 1, wherein the opening is formed by a cylindrical sleeve that penetrates the one mold and extends outward from the one mold. An actuator is attached to the end of the sleeve located outside the one mold;
12. The die casting apparatus according to claim 11, wherein the actuator reciprocates the plunger tip in the sleeve axial direction.   The die casting apparatus according to claim 12, wherein the inside of the sleeve includes a pipe line connected to the first vacuum generator. The movable mold includes an extrusion pin that penetrates the movable mold and slides in the movable mold;
The die casting apparatus according to claim 10, wherein one end of the extrusion pin appears in the cavity. A flow path through which air can flow is formed at the boundary between the extrusion pin and the movable mold,
15. The die casting apparatus according to claim 14, wherein the flow path is connected to a second vacuum generator. Further comprising a take-out device for taking out the molded product molded in the cavity from the die casting machine,
When the movable mold is in the second position, the take-out device is disposed between the fixed mold and the movable mold and receives the molded product pushed out from the extrusion pin. Item 16. The die casting apparatus according to Item 14 or 15.   The die casting apparatus according to claim 12, wherein the actuator vibrates the plunger tip.   18. The die casting apparatus according to claim 1, wherein the opening is located inward of a region surrounded by the outer periphery of the cavity.   The die casting apparatus according to claim 1, comprising a plurality of the openings. A pressure sensor,
20. The die casting apparatus according to claim 1, wherein the decompression sensor measures a degree of vacuum in the cavity. A position sensor,
21. The die casting apparatus according to claim 1, wherein the position sensor measures the position of the plunger tip. A pressure sensor,
The die casting apparatus according to any one of claims 1 to 21, wherein the pressure sensor measures a pressure in the cavity. A decompression sensor for measuring the degree of vacuum in the cavity;
A position sensor for measuring the position of the plunger tip;
A pressure sensor for measuring the pressure in the cavity;
A temperature sensor for measuring the temperature in the cavity;
A control panel that receives a signal from at least one selected from the group consisting of the pressure reduction sensor, the position sensor, the pressure sensor, and the temperature sensor, and transmits a signal corresponding to the received signal to the actuator; Prepared,
13. The die casting apparatus according to claim 12, wherein the actuator operates based on the transmitted signal.   The die casting apparatus according to any one of claims 1 to 23, wherein the opening is disposed at a final solidification position where the molten metal filled in the cavity solidifies last.   The die casting apparatus according to any one of claims 1 to 24, wherein the opening is disposed at an optimum filling position where a flow distance of the molten metal flowing in the cavity is the shortest.   The die casting apparatus according to any one of claims 1 to 25, wherein the opening is disposed at a position where a force is applied to a portion that requires the most force when the die casting product is separated from the fixed mold.   27. The die casting apparatus according to claim 1, wherein a durable coating agent is coated on a surface of the one mold that forms the cavity.   The die casting apparatus according to any one of claims 1 to 27, wherein a surface of the other mold forming the cavity is coated with a durable mold agent.   29. The die casting apparatus according to claim 27 or 28, wherein the durable coating agent contains mica.   The die casting apparatus according to claim 27 or 28, wherein the durable coating agent contains boron nitride.   31. The die casting apparatus according to claim 29 or 30, wherein the durable coating agent further contains water glass.   31. The die casting apparatus according to claim 29 or 30, wherein the durable coating agent further contains aluminum phosphate.   The die casting apparatus according to any one of claims 1 to 32, wherein a surface treatment by ceramic spraying is performed on at least a part of a surface of the one mold forming the cavity.   The die casting apparatus according to any one of claims 1 to 32, wherein a surface treatment by ceramic spraying is performed on at least a part of a surface of the other mold forming the cavity.   The die casting apparatus according to any one of claims 1 to 34, wherein an auxiliary runner having a narrow groove shape is provided on a surface forming the cavity of the one mold.   36. The die casting apparatus according to any one of claims 1 to 35, wherein an auxiliary runner having a narrow groove shape is provided on a surface of the other mold forming the cavity. An auxiliary runner having a narrow groove shape is provided on the surface forming the cavity of the one mold,
The die casting apparatus according to claim 9, wherein the auxiliary runner crosses an opening that accommodates the heat retaining container.   38. The die casting apparatus according to any one of claims 1 to 37, wherein the heat insulating container is made of a cylindrical heat insulating material with one end. A melting step of dissolving a desired metal and obtaining a molten metal;
A pouring step of pouring the molten metal into a cylindrical heat retaining container having one end;
A supply step of supplying a heat insulating container containing the molten metal to an opening formed in one mold constituting a die casting machine;
A mold closing step in which one mold of the die casting machine is overlaid with another mold arranged opposite to the one mold to form a cavity;
The cavity consists of an injection step of pouring the molten metal contained in the heat retaining container,
The die casting method, wherein the injection step includes a step of compressing and breaking the heat retaining container between a plunger tip disposed in the opening and the other mold. The heat retaining container includes a gripping cylinder for externally fitting the heat retaining container;
The step of supplying the peripheral wall of the holding cylinder and the peripheral wall of the heat retaining container at the same time;
40. The die casting method according to claim 39, further comprising a step of supplying both the gripping cylinder and the heat retaining container to the opening. The open end of the heat insulation container is inclined with respect to the bottom of the heat insulation container;
41. The die casting method according to claim 40, wherein the supplying step includes a step of sandwiching a peripheral wall of the gripping cylinder and removing the gripping cylinder supplied into the opening from the opening. After the pouring step and before the supplying step, further comprising a conveying step,
42. The method according to claim 39, wherein the transporting step includes a step of transporting the heat retaining container from a pouring device for pouring the heat retaining container to a supply device for supplying the heat retaining container to the die casting machine. The die-casting method of crab.   43. The die casting method according to claim 42, wherein the transporting step further includes a step of suppressing a temperature drop of the molten metal in the heat insulating container being transported.   44. The die casting method according to claim 39, wherein the supplying step further includes a step of attaching a filter to the opening formed in the one mold of the die casting machine.   The filter includes a ring member made of a pair of semi-annular plate members, the ring member is fitted into the opening formed in the one mold of the die casting machine, and the opening is partially blocked. 44. The die casting method according to any one of claims 39 to 43, comprising the step of: The injection step includes depressurizing the cavity;
46. The die casting method according to any one of claims 39 to 45, wherein the compressive fracture of the heat retaining container by the plunger tip is performed after the cavity is depressurized. The injection step includes measuring a vacuum in the cavity;
The die casting method according to claim 46, wherein after the measured value of the degree of vacuum in the cavity becomes equal to or less than a predetermined threshold value, the thermal insulation container is compressed and broken by the plunger tip.   48. The die casting method according to claim 39, wherein the injection step includes a step of measuring a pressure in the cavity.   49. The die casting method according to any one of claims 39 to 48, wherein the injection step includes a step of measuring a temperature in the cavity. A mold opening step of separating the other mold from the one mold;
50. The die casting method according to claim 39, wherein the mold opening step is performed after the injection step.   51. The die casting method according to claim 50, wherein the mold opening step includes a step of moving the plunger tip in a direction away from the other mold.   52. The die casting method according to claim 51, wherein the mold opening step includes a step of applying vibration to the plunger tip when the plunger tip is moved.   53. The die casting method according to any one of claims 50 to 52, further comprising a take-out step of disposing a take-out device between the one mold and the other mold separated in the mold opening step. .   The unloading step includes a step of moving an extruding pin attached to the other mold toward the one mold and supplying a molded product attached to the other mold to the unloading apparatus. 54. The die casting method according to claim 53.   55. The die casting method according to claim 54, wherein the removing step includes a step of applying a release agent to the one mold and the other mold after the molded product is supplied to the removing device.

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