WO2006001325A1

WO2006001325A1 - Die casting apparatus and die casting method

Info

Publication number: WO2006001325A1
Application number: PCT/JP2005/011513
Authority: WO
Inventors: Kiyoshi Fujino; Nagayoshi Matsubara; Hideki Murakami; Takashi Koide
Original assignee: Fujino Technical Consultant
Priority date: 2004-06-24
Filing date: 2005-06-23
Publication date: 2006-01-05
Also published as: JP4402007B2; JP2006116598A

Abstract

A die casting apparatus capable of easily casting a molding without causing shrinkage cavities and inclusion of gases by rapidly filling a molten metal in a metal mold cavity and effectively pressurizing the molten metal in the closed cavity, excellent in working efficiency, easily maintainable, and manufacturable at low cost, and a die casting method using the apparatus. The apparatus comprises an apparatus body having a fixed mold (1) and a movable mold (2) capable of forming the metal mold cavity, a casting sleeve (5) installed on the fixed mold (1) and communicating with the metal mold cavity (C), and a plunger (6) sliding in the casting sleeve (5) to fill the molten metal fed to the casting sleeve (5) into the metal mold cavity (C) and a casting means feeding and filling, from the underside, the molten metal into the casting sleeve (5) through a molten metal feedout opening (51) formed in the casting sleeve (5). The casting means further comprises a gas-pressurized molten metal pouring cradle (7) attachable to and detachable from the apparatus body.

Description

Specification

Die-casting device and die-casting method

Technical field

[0001] The present invention relates to a die casting forging apparatus that can fill a mold cavity from below with a molten metal to produce a forged product such as an aluminum alloy, and in particular, to a mold cavity using a gas pressure pouring pot. The present invention relates to a die casting forging apparatus for supplying and filling a downward force and a die force forging method using the same.

Background art

[0002] Conventionally, a die force such as an aluminum alloy has been used to inject molten metal such as a molten aluminum alloy into a mold cavity formed by a fixed mold and a movable mold and cool it to produce a porcelain. As shown in Fig. 12, in the stow forging device, when supplying molten metal to the mold cavity, a method of drawing the molten metal held in the molten metal holding furnace by the ladle and pouring the inlet hole force at the upper part of the staking sleeve However, it was necessary to use a long sleeve that enlarged the inlet hole at the top of the sleeve. When using a powerful squeezing sleeve, the amount of molten metal poured into the squeezing sleeve for one batch is much smaller than the sum of the volume of the staking sleeve and the sump at the tip. As the molten metal fills the sachet sleeve, the hot air surface is easily oxidized by the large air reservoir in the upper part of the melt, and the contact area with the stagnation sleeve is also increased, resulting in cooling and the formation of a solidified layer. In addition, when the plunger moves forward and fills the mold cavity with molten metal, the molten metal surface in the squeeze sleeve undulates and entrains air from the air pool at the top of the molten metal, and the acid film on the molten metal surface also peels off. The solidified layer that was mixed and burned was the resistance to the plunger advance, resulting in a substantial decrease in the penetration force, which was the cause of defective forged products.

[0003] On the other hand, it is already known to use low-pressure gas as a means for supplying molten metal from a molten metal holding furnace to a mold cavity while preventing oxide contamination and gas entrainment ( See Japanese Patent Publication No. 58-55166;). However, such a device contains a large amount of molten metal in a molten metal holding furnace fixed to the main body of the device, and since the squeezing speed is slow and the pressure is low, it prevents the shrinkage nest that occurs during solidification of the molten metal and reduces the thickness of the molten metal. It can handle the product enough Hanagagu also had a larger device. Furthermore, it is not easy to replenish the molten metal in the molten metal holding furnace fixed to the main body, and it is very difficult to clean and lubricate the inside of the main body.

[0004] The inventor has invented a method using an immersion type electromagnetic pump as a means for supplying molten metal to the mold cavity (see Japanese Patent Application Laid-Open No. 2002-108881). In order to cope with the rapid filling, the electromagnetic pump was large and the device was large, making it difficult to put it into practical use. In addition, it had the same problems as mentioned above, such as the difficulty in refilling the melt.

Patent Document 1: Japanese Patent Laid-Open No. 58-55166

Patent Document 2: JP 2002-108881

Disclosure of the invention

Problems to be solved by the invention

[0005] In the forging by the die casting forging apparatus, in order to produce a high quality forged product, particularly a thin and large forged product, it is necessary to fill the mold cavity with molten metal at a high speed. In addition, in order to prevent the inclusion of acid oxides and gas entrainment that cause defective defects in the fabricated product, and to prevent sinkholes caused by solidification shrinkage, it is necessary to fill the molten metal with a downward force. It is necessary to replenish the molten metal by effectively pressurizing it. At that time, in order to reduce the trouble during operation, it is necessary to simplify the structure of the entire manufacturing apparatus for practical use. Work efficiency and ease of maintenance are also very important factors.

[0006] An object of the present invention is to fill a mold cavity with molten metal at high speed, and effectively pressurize the molten metal in the blocked cavity so that there is no generation of shrinkage and no entrainment of gas. An object of the present invention is to provide a die casting forging apparatus that can be easily manufactured, has a high work efficiency and is easy to maintain, and has a low equipment cost, and a die casting method using the die casting forging apparatus.

Means for solving the problem

[0007] The inventors of the present invention diligently studied to solve the above problems, and by using a gas pressurized pouring pan that can be attached to and detached from the main body of the apparatus, work efficiency is high and easy-maintenance and low-cost equipment cost die casting. It can be a forging device, and the gas pressure of such a gas pressurized hot pot It has been found that by increasing the height, the molten metal can be supplied at a high speed, and it is possible to produce a forged product without mixing of an oxide film and gas, and the present invention has been completed. In addition, after filling the cavity with the molten metal that has been squeezed, if pressure is effectively applied by shortening the pressure transmission distance at multiple locations, there will be no formation of sink marks and contamination of the oxide film. In addition, the present inventors have found that a forged product without gas entrainment can be produced, and the present invention has been completed.

That is, the present invention relates to a fixed mold and a movable mold that can form a mold cavity, a swaging sleeve that is provided on the fixed mold side and communicates with the mold cavity, and a slide in the swivel sleeve. An apparatus main body having a plunger for injecting the molten metal that has been moved and delivered to the mold cavity into the mold cavity, and a downward force applied to the sandwiched sleeve via the molten metal delivery opening formed in the inserted sleeve. A die casting forging apparatus provided with squeezing means for supplying and filling molten metal, wherein the squeezing means has a gas pressurized pouring pot that can be attached to and detached from the apparatus body. The die-cast forging device (2) as described in (1) above, wherein the die-cast forging device (1) and the gas pressure pouring pan are attached to the device main body to form a sealed structure. A hot pot is included A die cast forging apparatus (3) as set forth in (1) or (2) above, wherein a sealing structure is formed by closely contacting the upper end of the encasing stork to the apparatus body; The die casting forging apparatus according to (1) or (2) above, wherein the apparatus main body is provided with stagnation stalk, and the upper end of the gas pressure pouring pan is brought into close contact with the apparatus main body to form a sealed structure ( 4) or a die-cast forging apparatus according to any one of the above (1) to (4), wherein the capacity of the gas pressurized hot water pan is a capacity capable of accommodating the molten metal required for one pouring. 5) or the die-cast forging apparatus (6) according to any one of (1) to (5) above, wherein the gas pressurized hot water pan is provided with heating means.

[0009] Further, the present invention is configured such that when the plunger tip of the plunger closes the molten metal delivery opening of the swallow sleeve, the front portion of the plunger tip in the swallow sleeve is filled with the melt. (1) to (6) characterized in that the die force strike forging device (7) described in the above or the die cavity is inserted into the inlet and the sleeve end force gradually increases in taper. The above-mentioned (1) to (7), characterized by comprising a hot water reservoir of the shape The die casting forging apparatus described in the force (8) and a pressurizing means for pressurizing the molten metal in the mold cavity, and the mold cavity includes a hot water reservoir for the pressurizing means (1 ) To (8), wherein the die casting forging device (9) and the swaging sleeve are fixed horizontally or vertically to a fixed mold and Z or a fixed platen (1) The die casting forging device (10) described in V to (9) or the mold cavity has a gas discharge passage, and a gap for the molten metal solidification zone connected to the gas discharge passage is provided in the vicinity of the gas discharge passage. The die cast forging apparatus (11) or the inserting means according to any one of the above (1) to (10), wherein the gas in the mold cavity is sucked in a vacuum by using a gas pressurizing pouring pot (1) to (1) above, characterized by having a vacuum suction mechanism for vacuum suction filling of the molten metal 11) or the large-diameter sliding part in which the plunger rod is inserted in the rear part and slides in the sleeve, and the large-diameter sliding part and the plunger The die casting forging device (13) according to any one of the above (1) to (12), characterized in that a gas chamber can be formed between the tip and the tip, and a gas pressurized hot water pouring pan are provided at the lower part thereof. The above-mentioned (1) is characterized in that a molten metal supply pipe connected to the opening is provided, and an openable and closable hot water supply lid having a sealing force capable of withstanding gas pressurization is provided at the molten metal supply pipe. To the die-casting apparatus (14) according to any one of (13) to (13).

Furthermore, the present invention is a forging method using the die casting forging apparatus according to any one of the above (1) to (14), wherein the molten metal is fed into the pouring sleeve through the pouring stalk from the gas pressure pouring pot force. Next, when the plunger sliding in the scissor sleeve is advanced and the plunger tip of the plunger closes the melt delivery opening of the scissor sleeve, the front part of the plunger tip in the scissor sleeve is melted. Filling, further advance the plunger, inject molten metal into the mold cavity and pressurize it to produce a forged product without gas entrainment (15) After closing the molten metal delivery opening, immediately release the gas pressure in the gas pressurized molten metal pan to the atmosphere and remove it from the main body of the equipment, and supply the required molten metal to the gas pressurized molten metal pan next time. The die casting forging method (16) according to the above (15), which is attached to the main body of the apparatus and preparing for the next forging, or the plunger sliding in the entraining sleeve is advanced, and the plunger rod When the large-diameter sliding part is inserted into the pinching sleeve, the large-diameter sliding part and the plunger tip A gas chamber is formed between the gas chamber, the gas is fed into the gas chamber, the plunger is further advanced, and the rear end of the plunger tip reaches the molten metal delivery opening to connect the gas chamber and the stalk. The die casting forging method (17) according to the above (15) or (16), wherein the molten metal in the stalk is dropped into the pouring pan with the gas pressure of the gas chamber force, etc. Pressure casting hot water The die casting method (18) or (18) described in any one of (15) to (17) above, characterized in that the gas pressure in the pan is adjusted to 1 kgZcm ² or more and is poured in at high speed in a short time. The die cast forging method (19) according to any one of the above (15) to (18), wherein the forged product is a thin and large forged product of a light metal alloy.

The invention's effect

[0011] According to the present invention, the mold cavity is filled with the molten metal at a high speed, and the molten metal in the blocked cavity is effectively pressurized so that there is no generation of shrinkage and no entrainment of gas. It is possible to provide a die casting apparatus that can be easily manufactured, has a high work efficiency and is easy to maintain, and has a low equipment cost, and a die casting method using the die casting apparatus.

Brief Description of Drawings

FIG. 1 is a schematic longitudinal sectional view of a die casting forging apparatus of the present invention.

FIG. 2 is a view taken along the line AA in FIG.

FIG. 3 is an explanatory view showing the operating state of the die casting forging apparatus of the present invention shown in FIG. 1, showing the state before swaging.

FIG. 4 is an explanatory view showing an operating state of the die casting forging apparatus of the present invention shown in FIG. 1, showing a state in which the molten metal is supplied into the filling sleeve.

FIG. 5 is an explanatory view showing an operating state of the die casting forging apparatus of the present invention shown in FIG. 1, showing a state in which molten metal is filled into a mold cavity.

FIG. 6 is an explanatory view showing the operating state of the die casting forging apparatus of the present invention shown in FIG. 1, showing a state in which the molten metal in the mold cavity is pressurized.

FIG. 7 is an explanatory view showing the operating state of the die casting forging apparatus of the present invention shown in FIG. 1, showing a state in which the mold is opened after filling and cooling of the molten metal is completed.

FIG. 8 is an explanatory view showing the operating state of the die casting forging apparatus of the present invention shown in FIG. This indicates the state of protruding.

FIG. 9 is a view showing an operating state of a die casting forging apparatus that is effective in another embodiment of the present invention, and shows a state in which molten metal is supplied into the staking sleeve.

FIG. 10 is a diagram showing an operating state of the die casting apparatus of the present invention shown in FIG. 9, and shows a state where the molten metal has been filled into the mold cavity.

FIG. 11 is a schematic longitudinal sectional view of a die casting forging apparatus that works on another embodiment of the present invention.

FIG. 12 is a schematic longitudinal sectional view of a conventional general die casting forging apparatus.

Explanation of symbols

1 …… Fixed mold

2 …… Moveable mold

3 …… Fixed platen

4 …… Moveable board

5 …… Pushing sleeve

51 …… Opening of molten metal

52 …… Gas chamber

6 …… Plunger

61 …… Hydraulic cylinder for plunger

62 · · · · Plunger rod (small diameter part)

63 …… Plunger tip

64 …… Large-diameter sliding part

7 …… Gas pressurized hot water pan

8 …… Packing

81 …… Pressurized gas inlet

82 …… Gas chamber entrance

9 …… Stoke

10 …… Forged products

11 …… Pressure pin

12 …… Pressure pin hydraulic cylinder 13 …… Vacuum suction passage

14 …… Pressure pin hot water reservoir

21 …… Melt supply passage

22 …… Water heater

23 …… Hot water supply sleeveless

24 …… Gas outlet

25 …… Hot water supply palate

26 …… Heating means

C …… Mold cavity

C1 …… Bath pool

C2 …… Side gate

M: Molten metal

BEST MODE FOR CARRYING OUT THE INVENTION

The die casting forging apparatus of the present invention includes a fixed mold and a movable mold that can form mold cavities, a swivel sleeve that is provided on the fixed mold side and communicates with the mold cavities, and the inside of the swivel sleeve. An apparatus main body having a plunger for injecting the molten metal that has been slid into the mold cavity into the mold cavity and the molten sleeve from below through the molten metal delivery opening formed in the inserted sleeve. And a filling means for supplying and filling the molten metal, and if the filling means has a gas pressurized pouring pan that can be attached to and detached from the apparatus main body, the horizontal type is not particularly limited. The die casting forging device of the present invention, which can be used, has a small pouring pot and can increase the gas pressure, so it can secure a high pouring speed, enable thin-walled forging, and move the pouring pot. As a result, it is easy to refill the molten metal, and the equipment can be easily arranged and operated as well as the equipment cost is reduced.At the same time, the pouring sleeve can be cleaned by removing the pouring pan outside the machine when the mold is opened. The spraying work for cooling and lubricating the mold surface can be done easily and safely. The forged product that can be produced by the die cast forging apparatus of the present invention is not particularly limited, but a light metal alloy, particularly an aluminum alloy having a large solidification shrinkage is preferable. Since aluminum shrinks by about 7% when solidified, the forging apparatus of the present invention that can prevent the formation of sink nests is This method can be applied particularly advantageously when a thin and large forged product is manufactured from a molten metal such as a lumi-um alloy having a large solidification shrinkage.

[0015] The gas pressurizing pouring pot in the filling means is not particularly limited as long as it is a pouring pan capable of gas pressurization and can be attached to and detached from the apparatus main body. For example, the gas pressure pouring pan needs to have a sealed structure.For example, a gas pressurized pouring pan with an open top can be provided with a lid, but it can also be sealed. Is preferably formed. As a configuration for forming a sealed structure by attaching to the apparatus main body, the gas pressurized pouring pan has a stagnation stalk. Specifically, for example, the upper surface of the stalk can be pressed against the lower portion of the swaging sleeve to form a sealed structure. In addition, when the device main body is equipped with a stagnation stalk, the upper end of the gas pressurized pouring pan can be brought into close contact with the device main body to form a sealed structure. The upper surface can be pressed against the lower surface of the fixed plate to form a sealed structure, or the sealed structure can be formed by pressing into a seal packing provided at the lower part of the fixed mold or fixed plate. At this time, it is preferable to make the upper portion of the gas pressurized hot water pot smaller than the lower portion so that it can be easily sealed in the apparatus body.

[0016] In this way, by using the gas pressurized pouring pan that can be attached to and detached from the apparatus main body, the molten metal is introduced by using, for example, a hot water supply ladle above the desorbed (removed) gas pressurized pouring pan. Therefore, the molten metal can be replenished very easily. In addition, it is possible to remove the gas pressure pouring pan and clean the lubrication sleeve of the device body and perform the spraying work for lubrication, making maintenance very easy.

[0017] Further, the gas pressurized pouring pan may have a molten metal supply pipe (a molten metal supply passage) communicated with an opening provided in a lower portion thereof. In this case, a gas supply port of the molten metal supply pipe has a gas An openable and closable hot water cap with a sealing force that can withstand pressurization is provided. Here, the lower part of the gas pressurized hot pot where the opening is provided means the part below the molten metal surface in the molten metal (when full) and is the part below the lower end of the stagnation stalk. Is preferred. In this case, it is not always necessary to remove and move the gas pressurized molten metal pan during hot water supply, but when removing and supplying hot water, the moving distance can be shortened and work can be performed more efficiently. . [0018] It is preferable that the pressurized gas hot-water pouring pan has a heating means. This suppresses the formation of a solidified layer, and it is possible to suppress the occurrence of defects in the forged product as much as possible with good hot water circulation. It becomes.

[0019] In addition, the capacity of the gas pressurized pouring pan can accommodate, for example, molten metal required for 1 to 3 times of pouring from the viewpoint of preventing the enlargement of the apparatus and the ease of carrying the gas pressurized pouring pan. It is preferable to have a capacity. It is more preferable that the capacity be enough to accommodate the molten metal required for one pour. By setting the capacity to accommodate the molten metal required for one squeeze, the amount of molten metal in the pouring pan at each squeeze is always constant, so it is easier and more continuous to fill without the need for pressure correction. In addition, it is possible to perform stable operation by suppressing the inclusion of oxides and gas entrainment. In other words, in the case of multiple volumes, the liquid level at each filling is different, and it is necessary to make fine adjustments to the pressure, but the capacity that can accommodate the melt required for one filling. By doing so, it is not necessary to make such a fine adjustment.

[0020] Such downsizing of the gas pressurized pouring pan can raise the molten metal surface and reduce the volume of the gas part, thereby making it possible to easily adjust the amount of molten metal supplied and to increase the gas pressure. Quantitative molten metal supply to mold cavities, high speed of supply speed and shortening of shot time lag can be achieved, and high quality forging can be produced for thin and large forged products. In addition, the use of such a pouring pan shortens the production cycle time, thus improving productivity.

[0021] Further, in addition to the gas pressurized pouring pot, the squeezing means preferably has a vacuum suction mechanism for sucking the gas in the mold cavity by vacuum and filling the molten metal in the gas pressurized pouring pot by vacuum suction. As a result, the mold cavity can be filled with the molten metal at a high speed, and the gas in the mold cavity can be discharged to prevent the gas from being entrained. This vacuum suction can be performed through a gas discharge passage which will be described later.

[0022] As the above-mentioned swaging sleeve, for example, the molten metal in the swaging sleeve can be poured into the mold cavity so as to pass through a fixing plate for fixing a fixed mold made of alloy steel, for example. Can be illustrated as being fixed in a substantially horizontal state, a substantially vertical state, or in an inclined state (hereinafter, a hot water supply device in which a swaging sleeve is installed in a substantially horizontal state is referred to as a horizontal type hot water supply device, a swallowing sleeve) The hot water supply device is installed in a substantially vertical state. This is called a direct water heater.) The filling sleeve is provided with a molten metal delivery opening that is a communication port with Stoke. For example, a horizontal type water heater has a molten metal delivery opening on the lower surface of the penetration sleeve, and a vertical type water heater has a molten metal delivery opening on the side of the penetration sleeve. However, in either case, a molten metal delivery opening is provided near the tip of the squeeze sleeve closer to the mold cavity, or the molten metal delivery opening is fixed on the fixed mold side fixed by the stationary platen. When the plunger tip of the plunger closes the molten metal delivery opening in the swaging sleeve, the contents of the front portion of the plunger tip in the swaging sleeve and the hot water reservoir are reduced, and As a result of the amount of pouring required for smelting and the front part of the plunger tip in the sleeve being filled with at least the molten metal, the contact between the molten metal and the gas is reduced as much as possible. Is moved forward the run jar chip, when NOTE enter the molten metal from the side gate to the Kiyabiti product portion, molten metal or ruffled, preferable in that there is no worry about involving the gas. For example, in the case of a horizontal type hot water supply device, when the plunger tip in the swaging sleeve closes the molten metal delivery opening, the volume in front of the plunger tip in the swallowing sleeve and the maximum horizontal position of the sleeve of the hot water reservoir are below By configuring the sum of the inner volume and the inner volume of the plunger sleeve to be smaller than the amount of pouring required for one forging, it is possible to fill at least the front portion of the plunger tip in the swaging sleeve with the molten metal.

[0023] Further, as a plunger in the hot water supply device for injecting the molten metal delivered to the swallow sleeve into the mold cavity, a plunger tip (plunger head) capable of sliding in the air tight sleeve in an airtight manner. Examples include a plunger rod that can move the plunger tip back and forth, and examples of the drive source for the reciprocating movement of the plunger rod include a hydraulic cylinder and a servo motor. When the plunger chip is positioned at the retracting end of the sleeving sleeve, it is possible to quickly pour molten metal from the stalk into the sleeving sleeve near the mold cavity side of the plunger tip. In addition, the molten metal from the stalk is normally used even when the plunger tip is positioned at the advance limit of the swaging sleeve so that the molten metal does not flow out to the back of the plunger tip. A plunger tip that is long enough to close the delivery opening is preferred to avoid operating problems.

[0024] Further, when the plunger tip is positioned at the advance limit of the swaging sleeve, It is also possible to use a plunger tip having such a length as to open the molten metal delivery opening. In this case, the plunger rod is provided with a large-diameter sliding portion that slides in the back portion of the plunger rod, It is preferable that a gas chamber be formed between the large-diameter sliding portion and the plunger tip of the plunger rod. In other words, a gas chamber is formed between the plunger tip located at the front and the large-diameter sliding portion located at the rear, and gas is fed into the powerful gas chamber using the gas supply means. The rear end can reach the molten metal delivery opening to connect the gas chamber and the stalk, and the gas pressure from the gas chamber can drop the molten metal in the stalk into the pouring pan. As a result, all molten metal can be reliably guided to the molten metal pot without leaving molten metal in the stalk, and troubles such as squeezing of the molten metal when the plunger tip retreats and solidification in the stalk occur. Can be prevented. The gas pressure in the gas chamber is not particularly limited, but the same gas supply means as the gas supply means for supplying the gas to be fed to the pouring pan, which is preferably equal to the molten metal pouring pressure, can be used. . It should be noted that the rear portion of the plunger head where the large-diameter sliding portion is provided may be a position having a certain distance from the plunger tip so that a gas chamber having a predetermined capacity can be formed. The center and rear end of the plunger rod can be mentioned, and the large-diameter sliding part can be integrally molded with the plunger rod, as with the plunger tip, or can be attached separately. .

In addition to the plunger, it is preferable that a pressurizing means for pressurizing the molten metal injected into the mold cavity is provided in a hot water reservoir for a pressurizing means such as a mold product part of the mold cavity. As a pressurizing means for pressurizing the molten metal injected into the powerful mold cavity, it is possible to suppress the formation of the shrinkage nest during solidification by pressurizing the molten metal filled in the closed mold cavity. However, as a means for pressurizing the molten metal in the mold cavity, a pressure pin slidably disposed on the movable mold that forms the cavity product part of the mold cavity is concretely used. Can be exemplified. When the molten metal in the mold cavity is solidified, the pressure pin can be advanced into the mold cavity to pressurize the molten metal. In addition, the advancement speed of the pressurization pin can be reduced by adjusting the pressurization speed, for example, by controlling the program so that the speed of the solidification and shrinkage of the melt in the cavity product section is adjusted. It is possible to prevent the formation of shrinkage nests while preventing burrs from being blown with a press device with a high clamping force. Also, a plurality of pressure pins can be provided.

[0026] In addition, as the mold cavity, a mold cavity capable of fabricating a thin and large forged product is preferred. Also, the mold cavity is inserted into the adjacent mold cavity entrance in communication with the insertion sleeve. The sleeve end force also has a hot water reservoir formed in a tapered shape, and the plunger does not pressurize the solidified layer generated on the side wall of the hot water reservoir. This is more preferable in that the molten metal can be sufficiently pressurized with a small applied pressure. The powerful hot water reservoir can be communicated with the mold cavity through the side gate.

[0027] In addition, as the stagnation stalk, the molten metal in the gas pressurized molten metal pan is the lowest, although it is provided in the apparatus main body or in the gas pressurized molten metal hot pot. It is preferable that the lower end is located below the hot water surface. As a result, it becomes possible to suppress defects in the manufactured product due to the mixing of the solidified layer and the acid film without mixing the acid film into the molten metal.

[0028] In the die casting forging apparatus of the present invention, a gas discharge passage capable of discharging a gas present in the cavity when the molten metal is filled in the mold cavity, and a molten metal coagulation zone connected to the gas discharge passage. What has a space | gap is preferable. The gas discharge passage is preferably composed of a gas discharge hole penetrating through the movable mold and a gas discharge gap. The molten metal solidification zone gap is preferably provided in the vicinity of the gas discharge passage, and particularly preferably close to the pressurizing means. As a powerful molten metal solidification zone gap, for example, after discharging the gas in the cavity also with the gas discharge passage force, the molten metal solidification zone can be used to solidify the molten metal, and in combination with the plunger, In addition, air vent valves, filters, etc. are installed and complicated by simply providing a gap for the molten metal solidification zone that can be used as long as it can seal and close the inside of the cavity. The inside of the cavity can be easily sealed and closed without using a simple switching valve or valve, and complicated operations such as pressure adjustment are not required when operating the forging device. It can be said that it is extremely practical to provide a gap for the molten metal solidification zone. Specifically, the molten metal solidification zone gap communicates with the gas discharge passage through a gas discharge gap formed between the outer peripheral surface of the pressure pin and the inner peripheral surface of the movable mold. The melt solidification zone melt gap can be illustrated as a powerful melt solidification zone gap, which is provided concentrically with the pressure pin and has an inner diameter that is 1 to 5 mm larger than the diameter of the pressure pin and about 10 to 40 mm. Specific examples of the voids serving as a molten metal solidification zone having a depth (length) of 2 mm can be given. In this way, by setting the outer diameter of each hot water pool portion to be slightly larger than the outer shape of the pressure pin, the solidified layer formed on the outer peripheral wall of each hot water pool portion is caused by the pressure pin to move into the product. The pressure resistance of the pressure pin can be reduced. As described above, if the gap for the molten metal solidification zone is designed to have a dimension that matches the molten metal temperature, the molten metal is cooled and solidified in this gap when the molten metal is filled. It does not enter the exit gap.

[0030] In addition, for example, the gas discharge gap preferably has a structure or a size that does not allow the hot water to flow in. For example, the gas discharge gap is provided concentrically with the pressure pin, and is smaller than the diameter of the pressure pin. Specific examples include gas discharge voids having an inner diameter that is about 4 to 1 mm larger. When vacuuming the mold cavity, in order to prevent the intrusion of air, if there is a gas discharge hole and a gas discharge passage that is a gas discharge void force on the parting surface, a seal packing should be installed if possible. A gas exhaust groove connected to the gas exhaust port will be provided to prevent air from entering the mold cavity from outside the mold.

[0031] By the way, assuming that the molten metal penetration start speed by the combined use of the gas pressure from the gas pressurized pouring pan and the vacuum suction mechanism is 1.0 to 2.4 mZsec, which is the optimum value, it is provided close to the outer periphery of the pressure pin. The air resistance in the two-stage gaps such as the molten metal solidification zone gap and gas discharge gap increases, but the above-mentioned molten metal solidification zone gap and gas discharge gap can be selected by appropriately selecting the number and arrangement of the pressure pins. The installation of can also achieve the purpose. That is, those skilled in the art can easily design a structure in which the hot water is cooled and solidified in the melt solidification zone gap having a two-stage gap and does not enter the gas discharge gap narrower than the melt solidification zone gap. Further, in order to cool and solidify the hot water in the molten metal solidification zone gap, a material having good heat conductivity such as beryllium copper can be used for the pressure pin, and the inside can be cooled with water. Next, the die casting forging method of the present invention will be described.

[0033] The die casting forging method of the present invention is a forging method using the above-mentioned die casting forging device, in which the molten metal is sent to the pouring sleeve through the pouring stalk from the gas pressure pouring hot pot power, and then in the pouring sleeve. When the plunger that slides forward is closed and the plunger tip of the plunger closes the molten metal delivery opening in the swaging sleeve, the front portion of the plunger tip in the swaging sleeve is filled with molten metal, and , Move the plunger forward, inject molten metal into the mold cavity and pressurize it to produce a forged product without entrainment of gas. The upper end of the gas pressurized pouring pan that received the molten metal was pushed into the seal knocking provided at the bottom of the fixed plate to seal the seal, preferably lk in the pouring pan Apply a gas pressure of g / cm ² or more, pressurize the hot water surface in the pouring pan, and send the molten metal to the brewing sleeve through the brewing stalk. At this time, when the gas pressurized pouring pan is provided with a molten metal supply pipe, the same gas pressure may be simultaneously obtained from above the hot water surface of the supply pipe. Next, when the plunger sliding inside the swaging sleeve is advanced and the plunger tip of the plunger closes the molten metal delivery opening in the swaging sleeve, the front portion of the plunger tip in the swaging sleeve is moved. Fill with molten metal, further advance the plunger, inject the molten metal into the mold cavity.Pressurize, then pressurize the molten metal in the mold cavity with the pressurizing means (pressurizing pin), and sink into the cavity when solidifying. A forged product with no generation of gas and no gas entrainment, preferably a light metal alloy thin and large forged product.

[0034] Further, in the die casting forging method of the present invention, after closing the molten metal delivery opening of the insertion sleeve, the gas pressure in the gas pressurized molten metal pan is immediately released to the atmosphere and detached from the apparatus main body. It is preferable to supply the necessary molten metal and install it again in the main body to prepare for the next fabrication. As a result, the production can be performed very efficiently using one gas pressurized hot water pot. It is also possible to forge using a plurality of gas pressurized pouring pans. In addition, when using a gas pressurized pouring pan equipped with a molten metal supply pipe, the gas in the molten metal pouring pot is released to the atmosphere, and the molten metal ladle is attached or detached with or without the main body of the apparatus. Open the lid and supply the next molten metal.

[0035] The die casting of the present invention is provided with a large-diameter sliding portion at the rear portion of the plunger rod. When using a forging device, when the plunger sliding inside the insertion sleeve is advanced and the large-diameter sliding portion of the plunger rod of the plunger is inserted into the insertion sleeve, the plunger tip A gas chamber is formed around the small-diameter portion of the plunger rod between the large-diameter sliding portion, the gas is fed into the gas chamber, the plunger is further advanced, and the rear end of the large-diameter storage portion Can reach the molten metal delivery opening, connect the gas chamber and stalk, and drop the molten metal in the stalk into the pouring pan with the gas pressure of the gas chamber. As a result, it is possible to reliably guide all molten metal to the molten metal pot without leaving the molten metal in the stalk, and troubles such as squeezing of the molten metal when the plunger tip is retracted and solidification in the stalk are generated. Can be prevented.

[0036] Preferred embodiments to which the die-casting apparatus of the present invention is applied will be described below with reference to the drawings, but the technical scope of the present invention is not limited thereto.

Example 1

FIG. 1 is a schematic cross-sectional view showing a die casting forging apparatus according to the present invention, FIG. 2 is an AA arrow view in FIG. 1, and FIGS. 3 to 8 are drawings of the die casting forging apparatus according to the present invention shown in FIG. It is explanatory drawing which shows an operation state. Hereinafter, a die casting forging apparatus provided with a gas pressurized pouring pan and a vacuum suction mechanism will be described as an example of the filling means.

[0038] The die casting forging apparatus of the present invention shown in Figs. 1 to 8 is a fixed mold 1 made of alloy steel fixed to a fixed platen 3 arranged on the right side in the drawing, and crimped to the fixed mold 1. The movable mold 2 placed on the left side of the drawing and the mold sleeve C for forming the molten metal into the mold cavity C formed between the fixed mold 1 and the movable mold 2 The plunger 6 that reciprocates in the sleeve 5, the gas pressurization pouring pan 7 that can be attached and detached to supply the molten metal to the swaging sleeve 5 through the stalk 9, and the molten metal in the mold cavity C are pressurized. A pressurizing pin 11 and a vacuum suction passage 13 communicating with the mold cavity C are provided, and molten metal is automatically poured into the mold cavity C and cooled to manufacture a fabricated product. Although not shown in the figure, the die casting forging apparatus is provided with a mold clamping device for performing mold opening for taking out the forged product 10 after the molten metal is cooled.

[0039] As shown in FIG. 1, the swaging sleeve 5 passes through the stationary platen 3 so as to communicate with the mold cavity C, and is fixed substantially horizontally to the stationary mold 1, and the molten metal M is molded into the mold cavity. Hot water supply to C On the lower surface of the pipe wall near the tip near the mold cavity, there is a molten metal delivery opening 51 to which a stalk (connecting duct) 9 inserted into the gas pressurized hot water pouring pan 7 is connected. . The inner diameter of the entrapment sleeve 5 increases the degree of fullness of the molten metal to reduce the volume of the space to eliminate gas entrainment. Also, a plunger that slides on the inner wall of the entrainment sleeve 5 in an airtight manner. In order to make the working surface of 6 smaller and to obtain the same penetration pressure with a small driving force, the diameter is smaller than the conventional one, and the plunger tip 63 of the plunger 6 is inserted into the insertion sleeve 5. When the molten metal delivery opening 51 is closed, the front portion of the plunger chip 63 in the swallow sleeve 5 is configured to be filled with at least the molten metal. That is, when the plunger tip 63 in the filling sleeve 5 closes the molten metal delivery opening 51, the front volume of the plunger tip 63 in the filling sleeve 5 and the maximum volume of the filling sleeve 5 in the hot water reservoir C1. In order to make the sum of the internal volume below the high position horizontal plane smaller than the amount of pouring required for one forging, the length of the swaging sleeve 5 is configured to be short and small in diameter.

[0040] The plunger 6 reciprocating in the swaging sleeve 5 pushes the molten metal M supplied to the swaging sleeve 5 to the mold cavity C, and is driven by the hydraulic cylinder 61 to reduce the diameter. Plunger rod 62 and the inner surface of the insertion sleeve 5 that slides on the inner wall of the insertion sleeve 5, and the working surface that pushes out the molten metal M. And a plunger tip 63 constituting the same. The length of the plunger tip 63 in the axial direction closes the molten metal delivery opening 51 even in the advance limit, and when placed in the retracted limit, the molten metal delivery opening provided on the lower surface of the pipe wall of the swaging sleeve 5. 51 does not close, and its tip is positioned immediately before the molten metal delivery opening 51. While the molten metal M is being fed from the gas pressurized pouring pan 7 to the squeeze sleeve 5, the molten metal delivery opening 51 The molten metal supplied to the swaging sleeve 5 is moved forward while the molten metal delivery opening 51 is closed by moving the front of the molten metal M to the swaging sleeve 5 and the forward movement. Extrusion and supply of excess molten metal M from the molten metal delivery opening 51 to the scooping sleeve 5 can be prevented.

[0041] The gas pressurizing pouring pan 7 is a pressure pouring pan that can accommodate the molten metal necessary for one pouring, and is connected to the pouring sleeve 5 through the stalk 9 to the powerful pouring sleeve 5. Hold molten metal M to be supplied. In addition, a pressurized gas passage 81 communicates with the pressurized gas pouring pan 7. The gas pressure pouring pan 7 can be pressurized. When the gas pressurized pouring pan 7 is attached to the main unit and sealed with knocking 8, the gas volume at the top of the gas pressurized pouring pan 7 is small.It is easy to control the pouring rate by the gas pressure. Desorbed, moved down to a position that does not hit the lower end of Stoke 9 and moved, the upper part of the gas pressurized pouring pan 7 is released, and the molten metal M can be easily replenished by any method such as a molten metal pump or a ladle. It has a structure. When the main body is installed, the lower end inlet of the stalk 9 is located below the lower limit of the molten metal surface that is lowered by one injection of the mold cavity, and when the molten metal M is delivered, The acid film near the surface is not mixed into the swaging sleeve. Stoke 9 is made of ceramic, which reduces the adhesion of molten metal M and prevents erosion by molten metal M.

[0042] The mold cavity C communicating with the swaging sleeve 5 is provided with a tapered hot water reservoir C1 that is slightly larger than the inner diameter of the swaging sleeve 5, and the hot water reservoir C1 is inserted into the metal via the side gate C2. It communicates with the product part of the type Cavity C. In addition, a pressure pin 11 is provided at one end of the product part of the mold cavity C to press the molten metal in the mold cavity C into the pressure pin hot water reservoir 14 by driving the hydraulic cylinder 12 for the pressure pin. It has been. A melt solidification zone gap communicating with the vacuum suction passage (gas discharge passage) 13 is provided in the vicinity of the force pressurizing means (not shown).

[0043] Next, a die casting forging method using the die casting forging apparatus will be described.

[0044] From the initial state shown in FIG. 3, the gas pressure applied to the molten metal surface of the pressurized gas fed to the pressurized gas pouring pan 7 through the pressurized gas inlet 81 (see FIG. 1) and the vacuum suction passage 13 By the suction by the vacuum suction mechanism communicated with the gas, the required amount of molten metal for one forging is sent from the gas pressurized pouring pan 7 into the entraining sleeve 5. At this time, as shown in FIG. 4, the molten metal level that has entered the hot water reservoir C1 of the mold cavity C from the filling sleeve 5 is higher than the highest horizontal surface of the filling sleeve 5. Because the front part of the plunger tip 63 is filled with the molten metal, no air remains in the swaging sleeve 5 and the surface of the molten metal does not oxidize. When the delivery of the molten metal is completed, as shown in FIG. 5, the hydraulic valve 61 is opened to actuate the hydraulic cylinder 61, and the plunger tip 63 starts to advance through the plunger rod 62. The molten metal delivery opening 51 is closed and the mold Cavity C is filled with molten metal. As described above, since air does not remain in the swaging sleeve 5, when the plunger tip 63 is advanced to fill the mold cavity C (cavity product part) with molten metal, the molten metal surface is ruffled. In addition, there is no gas entrainment or oxide film contamination. In addition, since the inner diameter of the hot water reservoir C1 of the mold cavity C is designed to be larger than the inner diameter of the swaging sleeve 5, a solidified layer is temporarily generated in the hot water reservoir C1 of the mold cavity C. Even in this case, the plunger 6 is not pushed into the mold cavity C.

[0045] When the filling is completed and the molten metal starts to cool, the molten metal solidifies and contracts. Therefore, as shown in Fig. 6, the pressure pin 11 is moved by the pressure pin hydraulic cylinder 12 under the pressure of the plunger. Make it work. It is difficult to transmit the pressure to the end of the mold cavity C only by pressurizing with the plunger 6, but by operating the pressurizing pin 11 to pressurize, there is no shrinkage due to solidification shrinkage over the entire surface. The organization's fake product can be obtained. After cooling and solidification of the mold cavity C molten metal is completed, the mold is opened (Fig. 7). The product material taken out by the movable mold can be pushed out by each pressure pin and extrusion pin (Fig. 8). ).

FIG. 9 and FIG. 10 are explanatory diagrams of a die casting forging apparatus according to another embodiment of the present invention. FIG. 9 shows a state in which molten metal is supplied into the swaging sleeve, and FIG. This shows the state where the molten metal has been filled into the mold cavity. As shown in FIG. 9 and FIG. 10, the die casting forging apparatus according to another embodiment of the present invention is a type in which the molten metal in the stalk is immediately dropped into the pouring pan after the completion of the pouring. The rear end portion 64 (large-diameter sliding portion 64) has the same diameter as that of the plunger tip 63, and when inserted into the swaging sleeve 5, a gas chamber 52 is formed and gas is supplied using a gas supply means. Gas is introduced from the chamber entrance 82. That is, as shown in FIG. 9, in the initial stage of filling the molten metal, no gas is supplied to the gas chamber 52 and the rear of the plunger tip 63 is opened, but by moving the plunger of a predetermined distance forward, A sealed gas chamber 52 is formed, and a gas having the same pressure as that in the pouring pan 7 is supplied into the powerful gas chamber 52 using a gas supply means. As shown in FIG. 10, when the plunger tip 63 moves forward in the swaging sleeve and the rear end reaches the molten metal delivery opening 51, the gas chamber 52 is connected to the stalk 9 and the gas in the gas chamber 52 is delivered to the molten metal. The gas flows out from the opening 51 to the Stoke 9 and the gas pressure is the same as that of the gas pressurizing pouring pan 7. The (residual) molten metal surface immediately drops down to the molten metal surface in the gas pressurized hot pot 7 and the gas in the pressurized gas hot pot 7 and the gas chamber 52 can be immediately released to the atmosphere. It is possible to detach the pressurizing hot water pouring pan 7 and to prevent troubles such as solidification in the molten metal stalk when the plunger tip 63 moves backward. FIG. 11 is an explanatory view of a die casting forging apparatus according to still another embodiment of the present invention. As shown in FIG. 11, in the die casting forging apparatus of the present invention, a gas pressurized hot water pouring pan 7 includes a molten metal supply pipe 21 communicating with an opening provided in a lower portion thereof, and a hot water inlet 22 of the molten metal supply pipe 21 is provided. An openable / closable hot water supply lid 25 having a sealing force capable of withstanding gas pressurization is provided. The hot water supply sleeve 21 provided at the upper part of the molten metal supply pipe 21 in the powerful die casting forging apparatus is provided with a gas outlet 24, and when the gas is pressurized, the pressurized gas inlet above the gas pressurized hot water pan 7 is provided. The pressurized gas is supplied from 81 and the same pressurized gas is supplied from the gas outlet 24 so that the molten metal can be supplied and filled more efficiently. Then, after pouring, the molten metal can be immediately dropped by introducing the gas from the gas chamber 52 into the stalk 9 as described above. The gas in the port 22 is vacuumed from the gas outlet 24, the molten metal in the molten metal supply pipe 21 is pulled up, the molten metal in the molten metal pan 7 is pulled down to the lower end of the stalk 9, and the molten metal in the stalk 9 is further removed. You can drop it quickly.

Claims

The scope of the claims

[1] Fixed mold and movable mold capable of forming mold cavity, insert sleeve provided on the fixed mold side, communicating with the mold cavity, and slide into the insert sleeve to form the insert sleeve An apparatus main body having a plunger for injecting the molten metal to the mold cavity, and a feeder for supplying and filling the molten metal with a downward force through the molten metal delivery opening formed in the insertion sleeve. A die casting forging apparatus, characterized in that the pouring means has a gas pressurized pouring pot that can be attached to and detached from the apparatus main body.

[2] The die casting forging apparatus according to [1], wherein the gas pressurized pouring pan is attached to the apparatus body to form a sealed structure.

[3] The die-cast forging apparatus according to claim 1 or 2, wherein the gas pressurized pouring pan is provided with a pouring stalk, and an upper end portion of the pouring stalk is brought into close contact with the apparatus main body to form a sealed structure.

[4] The die cast forging apparatus according to claim 1 or 2, wherein the apparatus main body is provided with stagnation stalk, and an upper end portion of the gas pressurizing pouring pan is brought into close contact with the apparatus main body to form a sealed structure.

[5] The die casting forging apparatus according to any one of claims 1 to 4, wherein the capacity of the gas pressurized hot pot is a capacity capable of accommodating the molten metal required for one pouring.

[6] The die cast forging apparatus according to any one of [1] to [5], wherein the pressurized gas pouring pan is provided with heating means.

[7] When the plunger tip of the plunger closes the molten metal delivery opening of the swallow sleeve, the front portion of the plunger tip in the swallow sleeve is configured to be filled with the melt. The die cast forging apparatus according to any one of claims 1 to 6.

8. The die cast forging apparatus according to any one of claims 1 to 7, wherein the mold cavity is provided with a tapered hot water reservoir portion that gradually expands from an end of the encroaching sleeve at an entrance thereof.

[9] The die casting according to any one of claims 1 to 8, further comprising a pressurizing unit that pressurizes the molten metal in the mold cavity, wherein the mold cavity includes a hot water reservoir for the pressurizing unit. Forging Place.

[10] The die-cast forging apparatus according to any one of [1] to [9], wherein the encasing sleeve is fixed horizontally or vertically to the stationary mold and Z or the stationary platen.

[11] The mold cavity includes a gas discharge passage, and a molten metal solidification zone gap communicating with the gas discharge passage is provided in the vicinity of the gas discharge passage. A die casting forging device according to any one of the above.

[12] The squeezing means has a vacuum suction mechanism that vacuum-sucks the gas in the mold cavity and vacuum-fills the molten metal in the gas pressurized hot pot. The die-cast forging device.

[13] The plunger rod is provided with a large-diameter sliding portion that slides in the insertion sleeve at the rear portion thereof, and a gas chamber can be formed between the large-diameter sliding portion and the plunger tip. The die casting forging device according to any one of claims 1 to 12.

[14] The gas pressurized pouring pan has a molten metal supply pipe communicating with an opening provided in a lower portion thereof, and an openable and closable hot water supply lid having a sealing force capable of withstanding gas pressure at the hot water supply opening of the molten metal supply pipe 14. The die cast forging apparatus according to any one of claims 1 to 13, wherein the die casting forging apparatus is provided.

[15] A forging method using the die-cast forging device according to any one of claims 1 to 14, wherein the molten metal is sent to the infeed sleeve through the intrusion stalk from the gas pressurized hot pot power, and then! Then, when the plunger that slides in the swaging sleeve is advanced and the plunger tip of the plunger closes the molten metal delivery opening of the swaging sleeve, the front portion of the plunger tip in the swaging sleeve is melted. A die casting forging method characterized by filling a metal, further advancing the plunger, injecting and pressurizing the molten metal into the mold cavity, and forging a forged product without gas entrainment.

[16] After closing the molten metal delivery opening of the squeeze sleeve, immediately release the gas pressure in the gas pressurized molten metal pan to the atmosphere and remove the power from the main body of the device to remove the molten metal required for the next time. The die casting forging method according to claim 15, wherein the die casting forging is prepared for the next forging by being supplied to the apparatus and mounted again on the apparatus main body.

[17] Advance the plunger that slides in the insertion sleeve, and slide the plunger rod over the large diameter. When the moving part enters the pinching sleeve, a gas chamber is formed between the large-diameter sliding part and the plunger tip, and gas is fed into the gas chamber to further advance the plunger. The back end of the blower tip reaches the molten metal delivery opening to connect the gas chamber and the stalk, and the molten metal in the stalk is dropped into the pouring pan with the gas pressure of the gas chamber. The die casting forging method according to claim 15 or 16.

[18] The die casting forging method according to any one of claims 15 to 17, wherein the gas pressure in the gas pressurized pouring pan is adjusted to 1 kgZcm ² or more and is poured in at high speed in a short time.

[19] The forged product is a thin and large forged product of a light metal alloy.

8. The die casting method according to any one of the above.