JPH05337627A - Die casting machine - Google Patents

Abstract

PURPOSE:To make casting pressure higher, to reduce loss of the casting pressure, to reduce the entrapment of the air into a casting product as less as possible and to generally improve the high pressure casting and casting cycle as much as possible. CONSTITUTION:After closing a check valve 26 for preventing back flow to a holding furnace 4 in the condition of filling molten metal 27 to a part near the tip position in a nozzle part 23, by quickly pouring the high pressure gas into a pressurizing chamber 3, the inner part in the pressurizing chamber is quickly pressurized to the high pressure, and by applying push-down pressure to molten metal 27 surface in the pressurizing chamber, the molten metal is quickly filled up into a cavity 13 in a clamped die from the nozzle part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting machine, and more particularly to a die casting machine capable of high pressure and high speed casting having a mechanism for pressurizing a molten metal in a pressurizing chamber with a compressed gas pressure and filling the die. It is about.

[0002]

2. Description of the Related Art A die casting machine in which a molten metal surface in a closed container is pressurized with compressed gas (compressed air, compressed inert gas, etc.) to raise and supply the molten metal into a mold that has been clamped , Is known as a vertical low pressure die casting machine. 5 to 9 are explanatory views showing the operating principle of the seeding type low pressure die casting machine.

5 to 9, reference numeral 100 designates a fixed mold 1.
01 is attached to the bottom (fixed) plate, 102 is the top plate, 103 is a movable plate to which a movable mold 104 is attached and which is vertically driven by a mold opening / closing drive source (not shown), and 105 is relative to the movable plate 104. The eject member 106 that can move up and down is a cavity (space for product casting) formed by the fixed mold 101 and the movable mold 104 during mold clamping. Further, 107 is an electric furnace having an airtight structure, and 108 is installed in the electric furnace 107 and the molten metal 10
The crucible filled with 9 is a stalk 110, one end of which is immersed in the molten metal 109 inside the crucible and the other end of which is drawn out of the electric furnace 107. 111 is connected to the stalk 110 and its tip is connected to the fixed mold 101. Nozzle closely attached to the molten metal inlet,
Reference numeral 112 is an air pipe connected to the electric furnace 107.

FIG. 5 shows a mold clamping process. In the mold clamping process, the movable die plate 103 is driven downward,
The movable mold 104 is pressed against the fixed mold 101 with a predetermined mold clamping force, and the parting line surface (PL surface; release surface) is closed. Next, in the filling (casting) process shown in FIG. 6, air is supplied from the air pipe 112 into the electric furnace 107 to pressurize the entire electric furnace 107. As a result, the molten metal 109 in the crucible 108 receives a pressing force, and the molten metal 109 is pushed up through the stalk 110, and enters into the cavity 106 through the stalk 110 and the nozzle 111. Is supplied and filled at a relatively low pressure and low speed. Next, in the cooling process shown in FIG. 7, the molten metal 109 in the cavity 106 is solidified, and the compressed air in the electric furnace 107 is discharged after the solidification, whereby the molten metal in the nozzle 111 and the stalk 110 is discharged. The 109 is put back into the crucible 108. After that, the process moves to the mold opening process shown in FIG. 8, the movable plate 103 is driven upward, and the movable mold 104 holding the product 113 is released from the fixed mold 101. Then, in the course of the mold opening process, the eject member 105 is driven to move downward with respect to the movable plate 103, and the product 113 is extruded as shown in FIG. The member 114 is inserted into the mold opening space to receive the product.

[0005]

Unlike the cold chamber type die casting machine, the vertical low-pressure die casting machine described above does not have a pressurizing mechanism by the plunger tip that moves forward and backward in the injection sleeve. No need to replace parts due to wear. However, the seeding type low pressure die casting machine is
As is well known, it is used for casting, for example, pressure-resistant strength parts by performing filling at a relatively low speed and cooling slowly, and usually one shot cycle requires 3 to 8 minutes. .. That is, the pressurizing chamber (electric furnace 107)
Has a large capacity, it is difficult to perform rapid pressurization, and there is a problem that high cycle casting cannot be performed.
Since the air capacity of the pressurizing chamber is large, the switching response of the pressing force and the pressing speed is extremely poor, and there is also a problem that it is not possible to cast products that require precise switching control of the pressing force and the pressing speed. .. Furthermore, the pressure applied to the molten metal is 1 kg.
/ Cm ² is normal, and even if the pressure chamber (electric furnace 107) is pressure-resistant modified by recent technology (which leads to an increase in the size of the device and a significant cost increase), the pressure chamber itself is large, so the pressure resistance is high. There is a limit to this (although it is different if the cost allowed in practice and the size of the pressurizing chamber are ignored), it is forced to use at 10 kg / cm ² or less, and 50 to 350 kg /
It was impossible to use it at a high pressure of cm ² .

[0006] On the other hand, Japanese Patent Laid-Open No. Sho 6 (1994) previously proposed by the applicant
Japanese Laid-Open Patent Application No. 4-62258 discloses a vertical die casting machine in which a pressurizing device is arranged at an intermediate position between a melting furnace (holding furnace) and a mold, and also, the Japanese Patent Application Laid-Open No. 1-95856 previously proposed by the present applicant. The publications each disclose a vertical die casting machine in which an improved hot water supply pump is arranged in the furnace, and the pressing force is increased as compared with the die casting machine having the configuration shown in FIGS. 5 to 9. It is possible and can also achieve some speedup. However, in the configurations of these prior applications, since the molten metal is filled up to the middle of the runner pipe before injection (because air is present in the upper part of the runner pipe, the nozzle, etc.), There is a problem that air is easily caught in the molten metal when the molten metal is pressed in, and the casting quality is deteriorated. Furthermore, in order to prevent the entrainment of air in the molten metal described above, normally, a low-speed injection process for leaking air out of the mold at the initial stage of injection is required, which naturally increases the casting cycle. It was limited.

Therefore, the technical problem to be solved by the present invention is to solve the above-mentioned problems of the prior art,
The purpose is to be able to increase the casting pressure, to reduce the casting pressure loss, and to reduce air entrapment in the cast product as much as possible. It is to provide a die-casting machine having a so-called hot-chamber type injection form that can be effectively improved.

[0008]

In order to achieve the above-mentioned object, a die casting machine according to the present invention has a holding furnace for storing molten metal, a die mechanism arranged in a horizontal die, and a bottom surface of a die of the die mechanism. The molten metal injection port provided, a nozzle part which is closely attached to the molten metal injection port and is disposed such that the height of the vicinity of its tip is substantially the same as the level of the molten metal in the holding furnace, and the mold. A pressurizing chamber arranged on the side of the mechanism, a gas pressure pressurizing means for pressurizing the molten metal in the pressurizing chamber with a compressed gas pressure, a lower part of the pressurizing chamber and a lower part of the nozzle part are communicated with each other. A hot runner portion; a molten metal passage portion that connects the lower portion of the holding furnace and the lower portion of the pressurizing chamber; and valve means that can open and close the molten metal passage between the holding furnace and the pressurizing chamber. With the valve means preventing the backflow of the molten metal to the holding furnace side,
The gas pressure pressurizing means pressurizes the pressurizing chamber, and the molten metal filled in the pressurizing chamber, the hot runner portion and the nozzle portion is press-fitted into the mold from the nozzle portion. It

[0009]

In the state before injection / filling, the molten metal level is adjusted to a constant level in the pressure chamber connected to the holding furnace by the melt passage and the nozzle unit connected to the pressure chamber by the hot runner. The molten metal is filled to the same height as the molten metal surface of the melting furnace (the molten metal is filled up to the portion near the tip of the nozzle). In this state, after closing the check valve arranged between the holding furnace and the pressurizing chamber, high-pressure gas is rapidly injected into the pressurizing chamber to rapidly pressurize the pressurizing chamber to high pressure and pressurize. By applying a large pressing force to the surface of the molten metal in the chamber, the molten metal is immediately pressed and filled from the nozzle portion into the cavity of the mold that has been clamped.

By doing so, since the pressurizing chamber of a relatively small capacity, which is isolated from the holding furnace, is pressurized with gas, the response to the pressurizing control is enhanced, and the small pressurizing chamber is opened. Since it is relatively easy to make a high withstand voltage structure and the cost is not so high, it is possible to perform rapid and high pressure casting in combination with a small capacity and a good press response. In addition, before injection, the molten metal is filled up to the part near the tip of the nozzle, so the flow distance of the molten metal is as short as possible, and the pressure loss of the casting pressure is minimal, which reduces casting efficiency. Further, it is possible to increase the temperature, and there is almost no possibility that air will be caught in the product (molten metal) when the molten metal is pressed into the mold, which greatly contributes to casting of non-defective products (non-porous and free from defects). In addition, the response of pressurization is good, the molten metal is filled almost directly under the mold, the molten metal press-in flow path for filling the molten metal is short, and the response is good. Combined with the fact that high-speed filling can be done from the beginning,
High cycle casting by high speed filling can be easily achieved.

Further, since the die mechanism is a general one arranged horizontally, peripheral machines such as a product take-out machine and a spray device are arranged around a popular cold chamber type die casting machine in which the die mechanism is arranged horizontally. It can be used as is depending on the machine, and there is no need to separately manufacture a special peripheral machine, which is advantageous in terms of cost. Furthermore, since the molten metal injection port of the mold is formed on the lower side of the parting line surface (release surface), the length of the molten metal passage in the mold can be shortened as much as possible. Also in this respect, it is possible to contribute to the improvement of the responsiveness of casting and the reduction of heat loss.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. 1 is a simplified front view of a die casting machine according to this embodiment, FIG. 2 is a simplified plan view of a die casting machine according to this embodiment, and FIG. 3 is a sectional view of FIG. FIG. 4 is a sectional side view, and FIG. 4 is an explanatory diagram of a pneumatic circuit connected to the pressurizing chamber.

In FIGS. 1 and 2, 1 is a base member, 2 is a mold mechanism (mold clamping mechanism), 3 is a pressure chamber, 4 is a holding furnace (melting furnace), and 5 is a pneumatic device. The mold mechanism 2 is the base member 1
It is provided above and has a known laterally arranged configuration (a configuration in which the movable portion is driven in the horizontal direction). Also,
The pressurizing chamber 3 is provided near the side of the mold mechanism 2,
A holding furnace 4 is arranged near the pressurizing chamber 3. The pneumatic device 5 is arranged near the pressurizing chamber 3.

First, the mold mechanism (mold clamping mechanism) 2 will be described. In FIGS. 1 and 2, 6 is a fixed plate fixedly arranged, 7 is a tail stock (supporting plate) arranged at a predetermined distance from the fixed plate 6, and between the fixed plate 6 and the tail stock 7. Is equipped with four tie bars 8. Reference numeral 9 denotes a movable plate inserted through the tie bar 8, which is a mold clamping cylinder 10 installed on the tailstock 8.
It is designed to be driven horizontally. Although a mechanism for driving the movable plate 9 by the mold clamping cylinder 10 is omitted in the drawing, a known direct pressure type mechanism or a toggle type link mechanism can be used.

Reference numeral 11 denotes a fixed mold attached to the fixed plate 6, and 12 denotes a movable mold attached to the movable plate 9. In the mold clamping state shown in the drawing, both molds 11 and 12 are used for product casting. A cavity 13 (FIG. 1), which is a space, is formed. Further, in the mold clamping state, the molten metal injection port 14 is formed on the lower side of the parting line surface of both molds 11 and 12, and the molten metal injection port 14 and the cavity 13 have a very short flow path. 15 (FIG. 1).

The mold mechanism (mold clamping mechanism) 2 can be lifted up from the base member 1 by a predetermined amount by means of the jack mechanisms 16 and 16, and the mold mechanisms 2 can be replaced by the jack mechanisms 16 and 16 at the time of mold replacement. The whole is lifted, the molten metal injection port 14 is separated from the nozzle portion 23 described later,
It is configured so that the mold can be changed from the side. Similarly, when it becomes necessary to repair the injection unit 17, which will be described later, the entire mold mechanism 2 is lifted,
The whole injection unit 17 is configured to be slidable.

Reference numeral 17 generally indicates an injection unit including the pressurizing chamber 3, the holding furnace 4, and the like. Next, the configuration of the injection unit 17 will be described mainly with reference to FIG. As shown in FIG. 3, the injection unit 17 is integrated by a holding block 18, and the holding block 18 is fixedly mounted on a carriage 19. A roller 20 is attached to a lower portion of the carriage 19, and the roller 20 is engaged with a rail 21 laid on the base member 1. Then, in the state where the rollers 20 of the carriage 19 are not fixed so as to be immovable, the holding block 1
A dolly 19 on which 8 is fixedly mounted can run along a rail 21. During the casting operation, the roller 20 is immovably moored, and the carriage 19 is lifted up by the nozzle touch cylinder 22 in a cantilever manner with the right side in FIG. 3 as a fulcrum. The tip of the portion 23 is configured to be pressed against the molten metal inlet 14 with a predetermined pressure.

The above-mentioned injection unit 17 has a nozzle portion 23 whose tip portion is in close contact with the molten metal inlet 14, the pressurizing chamber 3 to which a pressurizing force is applied to press the molten metal into the mold, and the nozzle portion. 23, a hot runner portion 24 that connects the lower portion of the pressurizing chamber 3 to the lower portion 23, the holding furnace 4 that stores the molten metal, a molten metal passage portion 25 that connects the lower portion of the holding furnace 4 and the lower portion of the pressurizing chamber 3, The check valve 26, the valve control unit, and the like provided between the passage 25 and the holding furnace 4 and the holding block 18 that holds them are mainly configured. The part that comes into contact with the molten metal (the part that is thickly hatched in FIG. 3) is made of ceramics, and this part is heated by a heater so as to maintain a predetermined temperature.

The check valve 26 provided between the molten metal passage 25 and the holding furnace 4 has a function of preventing the molten metal 27 from flowing backward from the pressurizing chamber 3 to the holding furnace 4 during the injection / filling process. It has a check valve operating bar 29 which is driven and controlled by a check opening / closing cylinder 28. The check valve 26 is normally placed in an open state lifted by the check opening / closing cylinder 28 except during the injection / filling stroke. When the check valve 26 is open, the pressurizing chamber 3 and the nozzle portion 23 are filled with the molten metal 27 to the same height as the molten metal 27 in the holding furnace 4 by the atmospheric pressure. It has become. That is, in this embodiment,
The position of the most distal end of the nozzle portion 14 is set so as to be slightly higher than the level of the molten metal in the holding furnace 4. As a result, the molten metal 27 before injection is almost in the shape of a mold. It is designed to be filled just below. Further, during the injection / filling process, the check valve 26 is driven downward so as to be in a non-return state in close contact with the sealing surface. Although the check valve 26 is provided at the outlet of the holding furnace 4 in this embodiment, the check valve 26 has a function of preventing the molten metal 27 from flowing backward from the pressurizing chamber 3 to the holding furnace 4 side. It suffices that the installation position be any position of the molten metal passage portion 25, and the structure of the valve and the valve drive mechanism can be selected arbitrarily.

The air supply pipe and the air discharge pipe from the pneumatic device 5 are connected to the pressurizing chamber 3, and the pressurizing chamber 3 having a relatively small capacity is compressed by the compressed air supplied from the air supplying pipe. It is said that the pressure inside can be increased rapidly. Also, a molten metal 2 in which a metal material such as aluminum or zinc is melted
Although not shown in the drawing, the holding furnace 4 filled with molten metal 2
A heating device for maintaining the temperature of No. 7 at a constant casting temperature is additionally provided, and a known appropriate molten metal height adjusting function for keeping the molten metal 27 at a constant molten metal level at all times is provided (for example, In the present embodiment, based on the detection information of the molten metal level detection sensor, the molten metal level adjustment cylinder is driven and controlled to control the amount of immersion of the molten metal level adjustment float 30 in the molten metal 27, thereby keeping the molten metal level constant. Has been adopted to keep)).
In FIG. 3, reference numeral 31 denotes a ladle for replenishing the molten metal 27.

FIG. 4 is a pneumatic circuit showing an example of a pneumatic device 5 for supplying / exhausting air (or an inert gas) connected to the pressurizing chamber 3, and 33 denotes the above-mentioned pressurizing chamber 3. Is an air supply pipe, and 34 is an air discharge pipe from the pressurizing chamber 3 described above. In the figure, reference numeral 35 indicates an air power unit, which is a filter (filter with drain) 36, 3
7, a pressure reducing valve 38, opening / closing valves 39, 39, an air compressor (air pressurizer) 40, a check valve 41, and the like. For example, the air supplied from an air pipe arranged in the factory is supplied with air. It is adapted to be taken in from the receiving section 42, pressurized by the air compressor 40 and outputted to the pressure accumulator 43, and the degree of pressurization can be variably controlled by variably setting the pressure reducing valve 38. .. The pressure accumulator 43 temporarily stores the high pressure air output from the air power unit 35,
If necessary, it is installed in order to discharge this in a short time so that the inside of the pressurizing chamber 3 can be pressurized to a high pressure all at once. A spring type safety valve 44 is attached to the pressure accumulating device 43, and when the pressure inside the pressure accumulating device 43 exceeds the allowable maximum pressure, air is leaked by this amount.

An electromagnetic control valve 45 for low speed pressurization control and an electromagnetic control valve 46 for high speed pressurization control are arranged in parallel downstream of the pressure accumulator 43.
By selectively opening and controlling 5, 5 and 46, compressed air is introduced from the air supply pipe 33 into the pressurizing chamber 3 through the flow control valves 47 and 48 corresponding to the electromagnetic control valves 45 and 46. Supplied. By variably setting the flow rate control valves 47 and 48, the flow rate of the air supplied to the pressurizing chamber 3, that is, the press-fitting speed of the molten metal 27 is variably set. Also,
The pneumatic circuit according to this embodiment shown in FIG.
It is possible to variably set the pressing force (casting pressure) within the range of 0 kg / cm ² , and it is possible to perform casting with a significantly high pressure press-fit control as compared with the die casting machine shown in FIGS.
Moreover, since the pressure accumulator 43 is provided and the pressurizing chamber 3 has a small capacity, the pressurizing response is also very good.

Further, an electromagnetic control valve 49 for normal discharge and an electromagnetic control valve 50 for emergency discharge are arranged in parallel in the air discharge pipe 34 of the pressurizing chamber 3, so that injection / filling ends. When the pressure in the pressurizing chamber 15 is subsequently reduced to atmospheric pressure, the electromagnetic control valve 49 for normal discharge is opened, and the flow control valve 5 is opened.
1. The air in the pressurizing chamber 15 is relatively slowly exhausted through the muffler 52. Also, in the unlikely event of an abnormal situation,
Emergency (rapid) when the electromagnetic control valve 50 for emergency discharge is opened
Exhaust is performed.

Next, the operation of this embodiment based on the above configuration will be described. Now, in the mold open state in which the movable plate 9 is in the left displacement position in FIGS. 1 and 2, the check valve 26 is open and the holding furnace is provided in the nozzle portion 23 and the pressurizing chamber 3. The molten metal 27 is filled to the same level as the molten metal 27 in 4 (the molten metal 27 is filled up to near the tip of the nozzle portion 23). In this state, the movable plate 9 is driven to the right in FIGS. 1 and 2 by the mold clamping cylinder 10, and the mold clamping process is performed so that the movable mold 12 comes into close contact with the fixed mold 11 with a predetermined mold clamping force. To be done. 1 to 3 show the state where the mold clamping is completed, after which the check valve 26 is closed by the check opening / closing cylinder 28. Then, at a predetermined timing thereafter, high-pressure air is rapidly injected into the pressurizing chamber 3 from the air supply pipe 33, and the inside of the pressurizing chamber 3 is rapidly and highly pressurized, whereby the nozzle portion 23 and the hot part are hot. Runner section 2
4. The molten metal 27 in the pressurizing chamber 3 is rapidly pressed and filled into the cavity 13 from the molten metal inlet 14.

After the injection (press-fitting) described above is completed, the pressure in the pressurizing chamber 3 is reduced at a timing when a predetermined cooling time has passed, and the air is exhausted from the air exhaust pipe 34, so that the pressurizing chamber 3 becomes large. The pressure is reduced to atmospheric pressure. Then, the check valve 26 is opened by the check opening / closing cylinder 28,
The pressurizing chamber 3 and the holding furnace 4 are connected by the molten metal passage portion 25. Thereby, the molten metal 27 corresponding to the amount of molten metal consumed by press-fitting for one shot is replenished from the holding furnace 4 to the pressurizing chamber 3 side. Along with this, the molten metal level of the holding furnace 4 is not lowered by a slight amount, but this is immediately adjusted to the original predetermined molten metal level by the above-described molten metal height adjusting means, and The surface level is always maintained at a constant level.

After the product (cast product) is cooled and solidified, the mold clamping cylinder 10 drives the movable plate 9 to the left in FIGS. 1 and 2 to start mold opening, whereby the movable mold 12 is manufactured. Is held and is released from the fixed mold 11. Then, for example, when the movable plate 9 reaches the left limit, the product is projected and separated from the movable mold 12 by a known product pushing mechanism (not shown), and the product is moved by the mold removing mechanism (not shown) to move the product to the mold mechanism. Taken out from 2. For reference, it was confirmed that the die casting machine of this example can achieve a high speed casting cycle of about 14 to 15 sec / 1 cycle.

In the mold replacement in this embodiment, as described above, the jack mechanism 16, 16 lifts the entire mold mechanism (mold clamping mechanism) 2 from the base member 1, and the molten metal injection port 14 Away from the nozzle portion 23,
Thereby, for example, the mold is changed from the side of the mold mechanism 2 by the automatic mold changing device. When the injection unit 17 needs to be repaired, the entire mold mechanism 2 is lifted up and one of the tie bars 8 (the tie bar that obstructs the movement of the injection unit 17) is automatically moved. A predetermined amount is extracted by an extracting device or the like, and the carriage 19 is lowered by the nozzle touch cylinder 22, and then the injection unit 17 integrated with the carriage 19 is slid along the rail 21 to move the mold mechanism 2 It is designed to be separated from. Then, in this state, the injection unit 17 is inspected and parts are replaced. Therefore, since the injection unit 17 can be repaired or inspected in a state where the injection unit 17 is separated from the mold mechanism 2, the maintenance work becomes extremely easy. Here, in this embodiment, the mold mechanism (mold clamping mechanism) 2 is lifted by the jack mechanism 16, but a jack mechanism is provided on the carriage 19 to replace the mold and to inspect and repair the injection unit 17. The injection unit 17 may be lowered together with the carriage 19.

As described above, according to this embodiment, rather than pressurizing the inside of the holding furnace 4 having a large capacity with gas, the pressurizing chamber 3 having a relatively small capacity is isolated from the holding furnace 4. Is pressurized with gas, the responsiveness to the pressurization control is enhanced, and it is relatively easy to make the small pressurizing chamber 3 a high pressure resistant structure, and the cost is not so high. Combined with the good pressure response, high-speed and high-pressure casting becomes possible. Further, before injection, the molten metal 27 is filled up to a portion close to the tip position in the nozzle portion 23, so that the flow distance of the molten metal becomes as short as possible, and the pressure loss of the casting pressure becomes small. Casting efficiency can be improved, and there is almost no risk of air being caught in the product (molten metal) when the molten metal is pressed into the mold, which greatly contributes to non-defective (non-porous and defect-free) casting. In addition, the responsiveness of pressurization is good, the molten metal 27 is filled almost immediately below the mold, the molten metal press-in flow path for filling the molten metal is short, and the responsiveness is good. Combined with the fact that high-speed filling can be performed from the beginning of the process, high-cycle casting by high-speed filling can be easily achieved.

Further, since the die mechanism 2 is a horizontal type, which is a general type, peripheral equipment such as a product take-out machine and a spray device is used as a common cold chamber type die casting machine in which the die mechanism is horizontally placed. It can be used as is depending on the peripheral machine, and there is no need to manufacture a special peripheral machine separately.
It is also advantageous in terms of cost. Furthermore, since the molten metal injection port 14 of the mold is formed on the lower side of the parting line surface (release surface), the length of the molten metal passage in the mold can be shortened as much as possible. Also in this respect, it is possible to contribute to the improvement of the responsiveness of casting and the reduction of heat loss.

Furthermore, since the injection unit 17 can be separated from the mold mechanism 2, the injection unit 1
Since maintenance and inspection can be performed in a state in which 7 is separated from the mold mechanism 2, maintenance work is facilitated.

[0031]

As described above, according to the present invention, the casting pressure can be increased, the casting pressure loss is small, and the entrainment of air into the cast product can be reduced as much as possible. It is possible to provide a die casting machine capable of high-pressure casting and the casting cycle can be increased as much as possible, and its value is enormous.

[Brief description of drawings]

FIG. 1 is a simplified front view of a die casting machine according to an embodiment of the present invention.

FIG. 2 is a simplified plan view of a die casting machine according to an embodiment of the present invention.

FIG. 3 is a sectional side view of FIG. 1 taken along the parting line surface of the mold.

FIG. 4 is an explanatory diagram showing a pneumatic circuit of a pneumatic device of a die casting machine according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the operating principle of a conventional vertical low-pressure die casting machine.

FIG. 6 is an explanatory diagram showing the operating principle of a conventional vertical low-pressure die casting machine.

FIG. 7 is an explanatory diagram showing the operating principle of a conventional vertical low-pressure die casting machine.

FIG. 8 is an explanatory diagram showing the operating principle of a conventional vertical low-pressure die casting machine.

FIG. 9 is an explanatory diagram showing an operating principle of a conventional vertical low-pressure die casting machine. 1 Base member 2 Mold mechanism (mold clamping mechanism) 3 Pressurizing chamber 4 Holding furnace (melting furnace) 5 Pneumatic device 6 Fixed plate 7 Tail stock (supporting plate) 8 Tie bar 9 Movable plate 10 Mold clamping cylinder 11 Fixed mold 12 Movable mold 13 Cavity 14 Molten metal injection port 16 Jack mechanism 17 Injection unit 18 Holding block 19 Truck 20 Roller 21 Rail 22 Nozzle touch cylinder 23 Nozzle part 24 Hot runner part 25 Molten metal passage part 26 Check valve 27 Molten metal 28 Check open / close cylinder

Claims (3)

[Claims] 1. A holding furnace for storing molten metal, a mold mechanism arranged horizontally, a molten metal injection port provided on the bottom surface of the mold of the mold mechanism, and a tip end portion of the molten metal injection port that is in close contact with the molten metal injection port. A nozzle portion arranged so that the height of a nearby portion thereof is substantially the same as the level of the molten metal in the holding furnace, a pressurizing chamber disposed on the side of the mold mechanism, and the pressurizing chamber. A gas pressure pressurizing means for pressurizing the molten metal with a compressed gas pressure, a hot runner part communicating the lower part of the pressurizing chamber and the lower part of the nozzle part, a lower part of the holding furnace and a lower part of the pressurizing chamber. And a valve means capable of opening and closing the molten metal passage between the holding furnace and the pressurizing chamber. The valve means prevents the molten metal from flowing back to the holding furnace side. In this state, the gas pressure pressurizing means pressurizes the pressurizing chamber, and pressurizes the pressurizing chamber, the hot runner section and the nozzle. A die casting machine, characterized in that the molten metal filled in the sledge portion is pressed into the mold from the nozzle portion. 2. The molten metal injection port according to claim 1, wherein the molten metal injection port is formed on a lower side of a parting line surface (release surface) of the fixed mold and the movable mold which are in close contact with each other when the mold is clamped. Die casting machine characterized by. 3. A pressure accumulating device according to claim 1, wherein a pressure accumulator is provided in the gas pressure pressurizing means, and high-pressure gas stored in the pressure accumulator can be supplied to the pressurizing chamber. Die casting machine.