JP7302284B2 - Structure of Vacuum Piping for Die Casting Machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to the structure of a vacuum pipe for a die casting machine for vacuuming a space formed by communicating from an internal space of a sleeve to a cavity.

As a conventional technique, for example, the prior art described in Patent Document 1 below is disclosed (see FIGS. 1, 2, and 5).

In this conventional technique, a cast burr suction prevention device main body is connected to the outlet of a gas vent passage (so-called chill vent) carved in a corrugated shape on the mating surfaces of a pair of chill blocks, and the casting burr suction prevention device main body The other end of a degassing pipe, one end of which is connected to a vacuum device, is connected to suck and discharge various gases such as combustion gas of lubricating oil and air remaining in the cavity, and the cavity is decompressed.

The main body of the casting burr suction prevention device removes powdery casting burrs generated during pre-casting and remaining in the cavity after the mold is cleaned. It works to catch and remove casting burrs before the vacuum device so that they do not reach the device by suction, that is, to prevent casting burrs from being sucked into the vacuum device together with various gases and causing malfunction of the vacuum device.

This burr suction prevention device main body is formed by cutting a rectangular block body into a longitudinally inclined shape, and connecting a pair of block bodies with inclined surfaces to a suction inlet, a suction outlet, and a burr discharge port. At the junction of the suction inlet and the suction outlet, one (Fig. 1) or several (Fig. 5) partition plates are arranged in a slanted shape, and the outside of the partition plate is provided. A connecting port for connecting the suction inlet and the suction outlet is provided in a part of the periphery.

The partition plate is for causing the burrs, which have entered the main body of the burr suction prevention device from the suction inlet together with various gases, to collide with the gases, convert the flow direction to a substantially obtuse angle, and separate the burrs from the gases. The suction inlet, the suction outlet, and the casting burr discharge port are formed in a disk shape with an outer diameter slightly larger than their inner diameters, and the suction inlet and suction outlet merge at a substantially L shape in the drawing. At the L-shaped confluence, both openings (suction inlet and suction outlet) opening along the inclined mating surfaces of the blocks are interposed so as to be closed except for a part of the elliptical opening edges ( Fig. 2), a connecting port for connecting the suction inlet and the suction outlet is provided between a part of the elliptical opening edge and a part of the outer periphery of the partition plate brought close to said part.

As is well known in the art, the vacuum device includes an electromagnetic valve that is electrically linked to the driving source of the injection cylinder and follows the injection operation of the cylinder to open the valve, a vacuum tank that stores suction force, and a vacuum chamber. and a pump.

The casting burr removing tank for receiving and accumulating the burrs discharged from the casting burr discharge port is formed in an airtight manner and receives and accumulates the casting burrs therein, and the accumulated casting burrs are removed during the casting cycle (1 cycle operation). The burr removal tank is constructed by incorporating various means for preventing backflow so that the gases do not jump out of the casting burr removal tank when the various gases are repeatedly sucked and discharged each time. Casting burrs accumulated inside can be taken out.

Such a casting burr suction prevention device main body has both openings (suction inlet, suction outlet) at a substantially L-shaped communicating portion between a suction inlet and a suction outlet that are opened in a pair of block bodies having inclined surfaces for abutting and matching mating surfaces. A partition plate is placed along the slanted edge of the slanted edge of the opening so that a connecting port connecting the two openings (suction inlet and suction outlet) is formed between the slanted edge of the opening and the part located on the casting flash discharge side Both block bodies are interposed and fastened together with bolts with an O-ring interposed between the mating surfaces in the vicinity of the periphery thereof, and a connecting plug is screwed into the suction inlet in a protruding manner. Then, the connecting plug is inserted into the outlet of the gas vent passage to connect it, and the casting burr suction prevention device body is attached to the chill block set in the fixed mold with the bolt passed through both block bodies, and the casting is performed. A degassing pipe that is piped across the vacuum device is connected to the suction outlet of the burr suction prevention device body, and a burr discharge pipe that is piped across the burr removal tank is connected to the burr discharge port.

In the casting burr suction preventing device body installed in this way, the electromagnetic valve of the vacuum device opens in a conventionally well-known set operation order, suction pressure reduction in the cavity starts, and various gases pass through the gas release passage. The burrs that have entered the body of the burr suction preventing device from the suction inlet collide with the partition plate, bounce back together with various gases to the burr discharge port, and change direction at a substantially obtuse angle. The burrs collided with the partition plate and bounced back to the burr discharge port side, and are discharged by their own weight from the burr discharge port through the burr discharge pipe into the burr removal tank. The liquid is sucked from the connecting port to the suction outlet side, and is sucked and discharged from the suction outlet through the gas vent pipe into the vacuum tank of the vacuum device.

When several partition plates are arranged at the confluence of the suction inlet and the suction outlet so that the casting burrs flowing together with various gases collide with each other several times, as shown in FIG. A plurality of spacer members (in the drawing, one spacer member in the drawing) are sandwiched between the mating surfaces of a pair of block bodies, and the above-described partition is formed on the slanted opening edge of the passage opening opened in the spacer member and the suction outlet. A partition plate is interposed by an intervening means similar to the plate to provide a communication port for connecting the passage port and the suction outlet. In this case, the connecting port is provided on the opposite side to the opening position of the connecting port connecting the suction inlet and the passage port, and the zigzag flow state of various gases collided from the suction inlet side to the suction outlet side. state.

By interposing several partition plates via several spacer members in this way, all the burrs that collide with the first partition plate are not discharged from the burr discharge port, but only one of them. Even if the gas enters into the passage port from the communication port together with various gases, it is separated from the gases by several collisions such as colliding with the partition plate again and is received in the passage port. It is also possible to connect a burr discharge pipe to the passage port in the same manner as the burr discharge port so that the burrs received in the passage port can be discharged into the burr removing tank.

In addition, a gas vent pipe connected to the suction outlet of the device body for preventing cast burrs suction is connected through a branch pipe to the middle of the gas vent pipe, and an electromagnetic valve is opened to open the inside of the device body for preventing cast burrs suction. Equipped with an air blow device that periodically cleans the When air blowing, open the mold and remove the burr discharge pipe.

Japanese Utility Model Publication No. 2-4764

In the prior art described above, the casting burr suction prevention device main body (corresponding to the molten metal slag box) is attached to the chill block set in the fixed mold, and the casting burr suction prevention device main body (corresponding to the molten metal slag box) ) is installed at a high place relative to the floor. Therefore, when performing maintenance of the casting burr suction prevention device main body (corresponding to the box for molten metal slag), high place work is required, which is disadvantageous in terms of work efficiency.

Therefore, in order to prevent high-place work and to be advantageous in terms of work efficiency, it is recommended that the installation position of the main body of the casting burr suction prevention device (corresponding to the box for molten metal slag) be low relative to the floor. preferable. If the installation position of the casting burr suction prevention device body (equivalent to the box for molten metal slag) is low relative to the floor, the suction port provided on the mold and the casting burr suction prevention device body (box for molten metal slag) corresponding) will be connected by the suction path.

Due to the influence of variations in the temperature of the injected molten metal, injection conditions, mold temperature, thermal expansion of the mold, etc., molten metal scum may enter the suction passage from the suction port and enter the suction passage. Residue of molten metal adheres. The adhering molten metal scum forms a constricted portion in the vacuum line, which lowers the efficiency of vacuum suction, is disadvantageous for the degree of vacuum, and makes stable vacuum suction impossible. Therefore, it is necessary to clean the residue of the molten metal adhering to the inside of the suction path.

Cleaning of molten metal residue is carried out by removing each component of the suction path. Suction paths are generally formed using steel pipes and threaded joints such as nipples, unions and elbows. Therefore, when removing each component of the suction path in order to clean the scum of the molten metal, it is necessary to use a tool. There is a problem that it is disadvantageous in

The present invention relates to a structure of a vacuum pipe for a die casting machine that vacuum-sucks a space formed by communicating from an inner space of a sleeve to a cavity of a mold, wherein the vacuum pipe is formed in the sleeve or the mold. a collecting part provided in the middle of a suction path through which gas is sucked through a suction port for collecting molten metal scum mixed in the gas; and at least a part of the suction path upstream of the collecting part a cleaning section extending from the side toward the collecting portion.
The cleaning section is curved from a plurality of pipes whose flanges are connected by connecting members.
The connecting member has a grip portion exposed to the outside of the pipe, and can be attached to and detached from the flange by the grip portion.

In the vacuum pipe structure of the die casting machine of the present invention, the connecting member includes a center ring disposed between the flanges, and a clamp that constrains the flanges in abutting state via the center ring. and wherein said clamp preferably includes two or more clamp bodies arranged around said flange, and said gripping portion capable of tightening and loosening said clamp bodies with respect to said flange. .

The invention according to claim 3,
In the structure of a vacuum pipe for a die casting machine that vacuum-sucks the space formed by communicating from the inner space of the sleeve to the cavity,
A suction port, a plurality of straight pipe portions, a plurality of curved pipe portions, and a box for molten metal residue,
The suction port and the molten metal residue box are connected by a suction path formed by combining the straight pipe portion and the curved pipe portion,
The suction path is formed by combining the straight pipe portion and the curved pipe portion using a vacuum pipe component that allows the flanges to be manually attached and detached,
By manually removing the straight pipe portion or the curved pipe portion, it is possible to clean the residue of molten metal adhering to the inside of the straight pipe portion or the inside of the curved pipe portion. The present invention relates to the structure of a vacuum pipe for a die casting machine.

The invention according to claim 4,
The vacuum piping component comprises a center ring, a first flange, a second flange and a clamp,
the clamp comprises a first body, a second body, a hinge mechanism, and a wing nut;
4. The vacuum for a die casting machine according to claim 3, wherein the wing nut can be manually turned to fix the first flange and the second flange by tightening or release the tightening fixation. Concerning the structure of piping.

The invention according to claim 5,
5. The vacuum pipe structure of a die casting machine according to claim 3, wherein the suction port is provided in the sleeve.

The invention according to claim 6,
6. The structure of the vacuum pipe for a die casting machine according to any one of claims 3 to 5, characterized in that the suction port is provided in the mold.

According to the vacuum piping structure of the die casting machine of the present invention, the gripping portion of the connecting member can be used to easily connect and disconnect the piping manually without using tools. be able to. Therefore, it is possible to contribute to the improvement of the working efficiency of the cleaning section, which is located upstream of the collection section and thus requires high cleaning.

According to the present invention, in conventional sleeve vacuum suction, in which the suction path tends to be blocked due to the molten metal scum, the collection part collects the molten metal scum to block the suction path and improve the suction efficiency. The stable operation of the die casting machine can be ensured by efficiently cleaning the piping in which the molten metal scum has accumulated while avoiding a decrease in the .

Hereinafter, the functions and effects of the present invention will be described using the terms of claims 3 to 6.
According to the invention,
In the structure of a vacuum pipe for a die casting machine that vacuum-sucks the space formed by communicating from the inner space of the sleeve to the cavity,
A suction port, a plurality of straight pipe portions, a plurality of curved pipe portions, and a box for molten metal residue,
The suction port and the molten metal residue box are connected by a suction path formed by combining a straight pipe portion and a curved pipe portion,
The suction path is formed by combining a straight pipe portion and a curved pipe portion using vacuum piping parts that can be manually attached and detached between flanges,
A vacuum of a die casting machine characterized in that it is possible to remove molten metal scum adhering to the inside of the straight pipe portion or the inside of the bent pipe portion by manually removing the straight pipe portion or the curved pipe portion. It is possible to provide the structure of the piping for

Therefore, according to the present invention, it is not necessary to use a tool when manually removing the straight pipe portion or the curved pipe portion, which are components of the suction path, in order to clean the residue of the molten metal. Therefore, the work is easy, the work time is shortened, and there is an advantage in terms of work efficiency.

1 is a schematic side view (partially including a cross-sectional view) of a die casting machine equipped with an injection device according to an embodiment of the present invention; FIG. 1 is a schematic diagram of an injection device and a vacuum device in the present invention; FIG. It is a figure explaining injection filling process from the hot water supply process which concerns on one Embodiment. It is a flow chart of a casting method by die casting. 1 is a flow chart of a casting method using the vacuum apparatus of the present invention; It is a figure which shows typically a part (cleaning area) and collection part of the suction path|route which concerns on 1st Embodiment of this invention. 7 is a cross-sectional view taken along line VII-VII of FIG. 6; FIG. FIG. 8 is a view showing the clamp in a closed state as viewed from arrow VIII in FIG. 7; Fig. 3 is a perspective view of the clamp in an open state; It is a figure which shows typically a part (cleaning area) and collection part of the suction course which concerns on the modification of 1st Embodiment. It is a figure which shows the example of piping which can be used for the cleaning area of 1st Embodiment. It is a figure which shows typically the cleaning area and collection part which concern on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in order based on the drawings.

FIG. 1 is a schematic side view (partially including a sectional view) of a die casting machine 100 equipped with an injection device 1 according to an embodiment of the present invention.

In the die casting machine 100 of this embodiment, a movable mold 22 is installed on the movable platen 4, and a fixed mold 21 is installed on the stationary platen 5, respectively. The movable platen 4 is moved on the machine base 8 toward the stationary platen 5 by a mold opening/closing/mold clamping mechanism (not shown) such as a toggle link mechanism or a ball screw mechanism. As a result, the movable mold 22 and the fixed mold 21 are engaged and die clamped to form a cavity 23 . Four tie bars 7 pass through the movable platen 4 and the stationary platen 5 through insertion holes, and the movable platen 4 moves forward and backward relative to the stationary platen 5 along the tie bars 7 . A fixed mold 21 and a movable mold 22 are engaged as shown in FIG. It is injected and filled to produce a casting product.

The stationary platen 5 has a sleeve (ejection sleeve) 11 . A driving hydraulic cylinder (not shown) is provided at the right end of the plunger rod 19 of the injection plunger 12 in order to inject the molten metal 18, and the plunger rod 19 engages a coupling (not shown). It is connected to the cylinder rod of the same hydraulic cylinder via. Further, the fixed mold 21 is provided with a sleeve 11 in which the molten metal 18 is stored, and the sleeve 11 is fitted into a hole 10 provided in the fixed mold 21 to form a hot water storage chamber. This hot water storage chamber communicates with the cavity 23 via a runner 24 and a gate 25 . The molten metal 18 is poured from the pouring port 13 by the ladle 43 (FIG. 3(a)) of the water heater, and then the molten metal 18 is pushed by the injection plunger 12 to fill the cavity 23 with the molten metal 18. For detection of the position of the injection plunger 12, as an example, a non-contact sensor detects a mark provided on the cylinder rod along the stroke of the hydraulic cylinder. Alternatively, a switch lever provided on the plunger rod 19 and a plurality of fixed limit switches may be used for detection.

FIG. 2 is a schematic diagram of the injection device 1 and the vacuum device 2 (vacuum suction system) according to the present invention, showing the configuration of the sleeve 11 of the die casting machine 100 having a plurality of suction ports 14-17. Suction ports 14 , 15 , 16 , and 17 are provided in order from the position near the pouring port 13 toward the mold side.

The inside of the sleeve 11 of the die casting machine 100 communicates with a cavity 23 composed of a fixed mold 21 and a movable mold 22, and the ladle 43 of the water heater shown in FIG. The molten metal 18 poured inside is injected into the cavity 23 (inside the mold). An injection plunger 12 is disposed within the sleeve 11 , and by advancing the injection plunger 12 , the injection plunger 12 pushes the molten metal 18 out of the sleeve 11 into the cavity 23 .

The sleeve 11 of this embodiment has a plurality of holes above the sleeve 11, and these holes are called suction ports 14-17. The air inside the sleeve 11 and the cavity 23 is removed from the suction ports 14 to 17 to evacuate the inside of the sleeve 11 and the cavity 23 . The air in the cavity 23 may be sucked from the mold side by another vacuum line provided separately from the line of the vacuum tank 36 at a suitable timing. 1 and 2, the number of suction ports 14 to 17 is four, but the number may be one or more. The opening positions of the suction ports 14 to 17 do not necessarily have the same pitch or regular arrangement, and may have different pitches or irregular arrangement in consideration of the behavior of the molten metal in the sleeve 11 . Similarly, the shapes and opening areas of the suction ports 14 to 17 do not necessarily have the same specifications, and may have different shapes and different opening areas in consideration of the behavior of the molten metal in the sleeve 11 .

3A to 3D are diagrams for explaining the hot water supply process to the injection filling process according to the present embodiment. As shown in FIG. 3(a), the molten metal 18 is poured from the pouring port 13 provided in the sleeve 11 by the ladle 43 of the water heater (hot water supply step). As shown in FIG. 3B, the injection cylinder is actuated, and the injection plunger 12 at the tip of the plunger rod 19 pushes out the molten metal 18 in the hot water storage chamber from within the sleeve 11 . Then, as shown in FIG. 3C, the molten metal 18 is pushed out from the runner 24 and the gate 25 to fill the cavity 23 with the molten metal 18 (injection filling step). Specifically, the advancing speed of the injection plunger 12 is set low (low speed region) until the extruded molten metal 18 reaches the gate 25 via the runner 24, and the molten metal 18 reaches the gate 25. After that, the advancing speed of the injection plunger 12 is set high (high speed region) until the cavity 23 is filled with the molten metal 18 . At the timing when the cavity 23 is filled with the molten metal 18 (speed/pressure switching point/VP switching point), the forward motion control of the injection plunger 12 is switched from speed control to pressure control (holding pressure control/pressure increase control). After that, the molten metal 18 is cooled in the mold with holding pressure (increased pressure) applied by the injection plunger 12, and when sufficiently solidified, the movable platen 4 moves to the left side of FIGS. It returns to its original position and the mold opens. When the mold is opened, a plurality of ejector pins 42 attached to an ejector plate 41 are advanced to the right in FIG. 1 by a hydraulic mechanism (not shown) to eject the product, and then the product is taken out.

Next, as an example, an embodiment in which there are four suction ports 14 to 17 will be described below with reference to FIG. In FIG. 2, the suction ports 14, 15, 16, and 17 are referred to as a first suction port, a second suction port, a third suction port, and a fourth suction port, respectively. The suction ports 14 to 17 are connected to the vacuum tank 36 by pipes (also referred to as suction paths). From each of the suction ports 14 to 17, an independent suction path 51 is formed through a vacuum filter 31, a pressure gauge 32, a suction port selection valve 33, and a distribution valve 34 in this order. , is connected to a vacuum tank 36 via a pipe 55 via a vacuum/air blow switching valve 35 . Although the vacuum device 2 (vacuum tank 36) is above the sleeve 11 in FIG. 2, it is not necessarily limited to this. I don't mind. On the other hand, the vacuum/air blow switching valve 35 is connected to the pressurized tank 38 via another pipe 56 . An air source 39 (compressed air source) is connected to the pressurized tank 38 .

A suction port selection valve 33 for selecting whether or not to use vacuum suction by the vacuum device 2 for each of the suction ports 14 to 17 is installed between the distribution valve 34 and the vacuum filter 31 in this embodiment. The vacuum filter 31 is installed because when the inside of the sleeve 11 is evacuated, scum of the molten metal may be drawn together with the air. The vacuum filter 31 prevents debris from molten metal from entering pipes and valves and causing clogging. The vacuum filter 31 catches the molten metal residue and prevents the molten metal residue from being brought into the pipes and valves. The material of the vacuum filter 31 is desirably a material that has a low exhaust resistance during vacuum suction and a material that does not burn even if high-temperature molten metal scum enters. Inexpensive and replaceable materials, such as punching metals, mesh wire nets, and stainless steel scrubbing brushes, are also desirable.

In this embodiment, the pressure gauge 32 is installed in the suction path 51 of each of the suction ports 14 to 17 between the vacuum filter 31 and the suction port selection valve 33 . During vacuum suction, the pressure gauge 32 monitors the degree of vacuum in each suction path 51 corresponding to each of the suction ports 14-17. Since the degree of vacuum of each suction path 51 is monitored by the pressure gauge 32 , the suction port selection valve 33 can be used to eliminate the need for suction ports that are likely to be clogged with molten metal residue. That is, by monitoring the degree of vacuum of each suction path 51 with the pressure gauge 32, the vacuum suction time of the sleeve-side suction port, which is likely to be clogged with molten metal residue, can be shortened, and clogging with molten metal residue can be suppressed. The pressure gauge 32 (pressure detection unit) may be a pressure gauge capable of measuring both abnormal negative pressure during evacuation and abnormal pressure (plus) during air blow. A pressure sensor or the like that can transmit as a signal is more preferable. The pressure detection unit includes a pressure gauge, a compound gauge, a pressure sensor, and the like.

When air blowing through the suction ports 14 to 17 from the pressure tank 38, if the inside of the piping or the vacuum filter 31 is clogged with molten metal scum, the inside of the piping or the vacuum filter 31 will show abnormal pressure. 31 clogging can be detected. At this time, if the pressure rises and reaches the set value during the air blow, the inside of the pipe or the vacuum filter 31 or the like is clogged, so an alarm is issued. When the clogging alarm is given, the work is stopped and the molten metal residue is cleaned. A suction port selection valve 33 can eliminate the need for a suction port that is likely to be clogged with molten metal scum. Alternatively, by closing the suction port selection valve 33 early, the vacuum suction time can be shortened, so clogging of molten metal scum can be suppressed.

During vacuum suction, by monitoring the degree of vacuum in the designated suction path 51 with the pressure gauge 32, it is possible to confirm that the vacuum suction operation has been performed normally. That is, it indicates that the vacuum/air blow switching valve 35 has operated normally.
By confirming whether or not each suction path 51 is clogged with molten metal scum and whether or not the evacuation operation has been performed normally, it can be determined whether or not the cavity 23 communicating with the sleeve 11 has also been normally evacuated. can judge.

Next, the suction port selection valve 33 that enables selection of use or non-use of vacuum suction by the vacuum device 2 at each of the suction ports 14 to 17 will be described. In the case of FIGS. 1 and 2 of this embodiment, there are four suction ports, and one suction port selection valve 33 is attached to each of the suction ports 14-17. The suction port selection valve 33 set to “use” is opened when the inside of the sleeve 11 is evacuated or when the suction ports 14 to 17 are blown with air. It is closed when there is no need to draw a vacuum or when there is no need to blow air. The suction port selection valve 33 set to "non-use" is normally closed. It should be noted that it may be opened at the time of air blow. Combinations of settings for using or not using the four suction port selection valves 33 can be freely selected as appropriate.

The vacuum/air blow switching valve 35 is
(1) whether the inside of the sleeve 11 and the cavity 23 are evacuated;
(2) Do you clean the inside of the pipe with an air blow?
when choosing, i.e.
Whether the suction ports 14 to 17 and the vacuum tank 36 are connected in the case of (1) above,
In the case of (2) above, whether the suction ports 14 to 17 and the pressurized tank 38 (or the air source 39) are connected,
It is a switching valve for switching between the vacuum drawing pipe 55 and the air blow pipe 56 when selecting .

The vacuum tank 36 is constantly sucking the air in the vacuum tank 36 by a vacuum pump 37 . Also, the vacuum pump 37 is driven by a motor. The degree of vacuum in the vacuum tank 36 is monitored by a pressure gauge 40, and an alarm is issued when the pressure becomes worse than the set value. Incidentally, the degree of vacuum of the vacuum tank 36 must be maintained at approximately −95 kPa or less.

The air for the air blow is temporarily stored in the pressurized tank 38 from the air source 39, and after the vacuum/air blow switching valve 35 switches to the air blow, it passes through the vacuum/air blow switching valve 35 to the suction ports 14 to 17. It will come. By switching the vacuum/air blow switching valve 35, for example, when an air blow is performed, air is discharged from the pressurized tank 38 to the suction ports 14 to 17, and the air blow of the suction path 51 is performed.

As shown in FIG. 1, a chill vent 27 or a vacuum valve (not shown) is installed in the upper part of the mold where the fixed mold 21 and the movable mold 22 are joined. In the case of (2), the air in the cavity 23 is drawn from the connection port 28) provided at one or a plurality of locations. Both the chill vent 27 (or the vacuum valve) and the sleeve 11 draw air into the cavity 23 and the sleeve 11 at the same time or with different timings. The chill vent 27 is often used when manufacturing light metal molded products by high pressure die casting, and is a chiller used for degassing. Outflow of the melt 18 is prevented by the chill vent 27 when the cavity 23 is vented. The chill vents 27 are formed in a pair of blocks, each fixed to the movable mold 22 and the fixed mold 21 so that they are separated when the molds are opened.

FIG. 4 shows a flow chart of a casting method by die casting. The flow chart starts with the start of die casting, and proceeds in order from mold clamping, metal pouring, injection start, and sleeve vacuum. If there is no sleeve vacuum process (if sleeve vacuum is not required), the order of pressure increase switching command, cooling (solidification), mold opening, product ejection, product detection, mold spray, injection retreat, tip lubrication. The process advances and the next cycle begins. If sleeve vacuum is used in this step, proceed to circuit A of the casting method of one embodiment of the present invention.

The circuit A of the casting method according to the present invention will now be described with reference to FIGS. 5 and 2. FIG.
In step S101, it is confirmed whether the vacuum tank 36 has become sufficiently evacuated, and a ready signal is issued.
In step S102, after the injection plunger 12 advances after pouring and comes to the position where the pouring port 13 is closed, the sleeve 11 is started to be evacuated. The position of the injection plunger 12 at this time is called the vacuum start position (FIG. 2). The arrival of the injection plunger 12 at the set vacuum start position is detected by detecting the stroke of the hydraulic cylinder that drives the injection plunger 12 with a non-contact sensor or the like. Arrival of the injection plunger 12 at each set position in the following steps is also detected in the same manner.
In step S102, when the injection plunger 12 moves forward after pouring and comes to the position where the pouring port 13 is closed, the sleeve 11 is started to be evacuated.

In step S103, the vacuum/air blow switching valve 35 is switched to vacuum.
In step S104, the injection plunger 12 reaches the set position (FIG. 2/first suction port closing position) to close the first suction port 14. FIG.
In step S105, in order to close the first suction port 14, the suction port selection valve 33 is closed.

In step S106, the injection plunger 12 reaches the set position (FIG. 2/second suction port closed position) to close the second suction port 15. FIG.
In step S107, in order to close the second suction port 15, the suction port selection valve 33 is closed.

In step S108, the injection plunger 12 reaches the set position (FIG. 2/third suction port closed position) to close the third suction port 16. FIG.
In step S109, in order to close the third suction port 16, the suction port selection valve 33 is closed.

In step S110, the injection plunger 12 reaches the set position (fourth suction port closed position in FIG. 2) to close the fourth suction port 17. FIG. Here, the degree of vacuum of the fourth suction port 17 is measured by the pressure gauge 32 just before the injection plunger 12 reaches the set position for closing the fourth suction port 17 . The degree of vacuum of the fourth suction port 17 is managed by setting upper and lower limits. If this degree of vacuum is out of the set range, an alarm is given by means of a lamp, buzzer, or the like. The range of the upper limit and the lower limit is preferably -90 to -100 kPa.
In step S111, in order to close the fourth suction port 17, the suction port selection valve 33 is closed.

In step S112, the vacuum/air blow switching valve 35 is turned off.
In step S113, the suction port selection valves 33 of the suction ports 14 to 17 are all opened.
In step S114, the vacuum/air blow switching valve 35 is set to air blow.
In step S115, an air blow is performed. At this time, the suction port selection valves 33 of the suction ports 14 to 17 may all be opened, or the suction port selection valves 33 may be opened one by one in order.
In step S116, the pressure in each of the suction paths 51 of the suction ports 14 to 17 is measured by the pressure gauge 32, and clogging of the pipes and the vacuum filter 31 is determined. When clogging occurs, an alarm is issued by means of a lamp, buzzer, or the like.

Incidentally, the timing of performing the air blow in step S115 is when the molten metal 18 is not present in the sleeve 11 with the suction ports 14 to 17 open, except immediately before the molten metal 18 is supplied (pouring) into the sleeve 11. There are no particular restrictions. For example, during the casting cycle, the injection plunger 12 may advance within the sleeve 11 and reach the suction port that is the most distant from the pouring port 13. Specifically, the injection plunger 12 is , after reaching the suction port 17 (fourth suction port 17) in FIG. Injection in the operation of pushing out the injection plunger 12, which is in contact with the casting through the biscuit portion, to its forward limit position so that the casting is securely held on the side of the movable mold 22 equipped with a product pushing mechanism. It may be the forward limit position of the plunger 12 . In addition, when selecting an operation mode by operating a switch for switching the operation mode of the die casting machine 100 (1-cycle automatic operation mode at the start of casting/fully automatic operation mode) other than during the casting cycle, switching operation of the switch At times, the air blow in step S115 may be automatically performed.

The flowchart has been described above. Here, all of the suction ports 14 to 17 from the first suction port 14 to the fourth suction port 17 are used to evacuate the sleeve 11, but in addition to this, the third suction port 16 and the The combination of using two of the four suction ports 17 or using three of the second suction port 15, the third suction port 16 and the fourth suction port 17 is free. Furthermore, there is no limit to the number of suction ports that can be used.

Next, whether the "upper limit sleeve filling rate" is used or not will be explained. The “upper limit sleeve filling rate” means that when the filling rate of the molten metal 18 in the sleeve 11 (referred to as sleeve filling rate) rises to a predetermined value (for example, 80%), the injection plunger 12 reaches the cavity 23 from the suction port. This is the upper limit of the sleeve filling rate when all the suction port selection valves 33 belonging to the closest suction ports are closed. Therefore, using the "upper limit sleeve filling rate" means that when the sleeve filling rate reaches a predetermined value, the suction port selection valve 33 belonging to the suction port near the cavity 23 from the suction port reached by the injection plunger 12 to all closed. The upper limit sleeve filling rate can be freely set before casting.

The purpose of using the upper limit sleeve filling rate is to prevent scum of molten metal from entering the suction path 51 from the suction ports 14 to 17 during vacuuming due to a high sleeve filling rate. This is because the sleeve 11 is evacuated by the maximum number of suction ports from 17 to 17 that do not allow the debris of the molten metal to enter the suction path 51 .

[First embodiment]
Next, a vacuum piping structure 150, which is a part of the suction path 51 according to the first embodiment of the present invention, will be described with reference to FIGS. 6 to 9. FIG. The first embodiment relates to facilitating cleaning of molten metal scum S, which is droplets of molten metal and solidified pieces, etc., adhering to the inside of a vacuum pipe. The vacuum piping structure 150 disclosed in the first embodiment can be applied to die casting machines including the die casting machine 100 .

The first embodiment shows the structure of a suction path 51 (vacuum pipe) that vacuum-sucks the space formed by communicating from the inner space of the sleeve 11 to the cavity 23 . Here, a suction path 51 for sucking the internal space of the sleeve 11 from each of the suction ports 14 to 17, which are a plurality of holes opening in the sleeve 11, will be described.
However, the suction path 51 is connected to other holes or openings provided in the sleeve 11 as long as the space formed by communicating from the inner space of the sleeve 11 to the cavity 23 can be vacuum-sucked. or connected to a passage provided in the injection plunger 12 , for example, a passage extending axially from the plunger tip toward the rear end of the injection plunger 12 . The suction path 51 may be connected to only one suction port formed in the sleeve.
Further, the suction path 51 is not limited to the one connected to the hole or opening of the sleeve 11 or the injection plunger 12 of the injection device, and is connected to the connection port 28 (FIG. 2) provided at one or more positions of the mold. It may be

FIG. 6 shows a collecting portion 152 provided in the middle of the suction path 51 through which gas is sucked from the inside of the sleeve 11 through the suction port 14, and a collecting portion 152 extending from the upstream side toward the collecting portion 152. A vacuum plumbing structure 150 with cleaning section 151 is shown.

The cleaning section 151 includes the suction ports 14 to 17 connected to the inner space of the sleeve 11, which is the source of the molten metal waste S, etc., in the suction path 51, and the collecting portion 152 for collecting the molten metal waste S, etc. mixed in the gas. corresponds to the interval between
The gas sucked from the inside of the sleeve 11 may contain, in addition to the molten metal sludge S, foreign matter such as dust, and surplus oil-based or water-soluble lubricant used for lubricating the plunger tip. The gas sucked from the cavity 23 may also contain, in addition to the molten metal sludge S, foreign matter such as dust, and surplus oily or water-soluble release agent. In this specification, molten metal sludge S, foreign matter, lubricants, mold release agents, etc. are referred to as "molten metal sludge, etc.".

For example, due to the influence of variations in temperature of the injected molten metal, injection conditions, temperature of the mold, thermal expansion of the mold, and the like, molten metal scum S and the like may enter the suction path 51 from the suction port 14 (or 15 to 17). There is a possibility that molten metal scum S or the like may enter and adhere to the inside of the suction path 51 . The adhering molten metal scum S and the like form a constricted portion in the suction path 51 .
Here, upstream of the collecting portion 152 in the flow of the sucked gas has a larger amount of molten metal scum S and the like mixed in the gas than downstream of the collecting portion 152 (vacuum tank 36 side). , molten metal scum S and the like tend to adhere to the inner wall of the pipe. Therefore, the cleaning section 151 upstream of the collecting section 152 has a higher need to remove the molten metal scum S and the like by cleaning than the piping downstream of the collecting section 152 .

That is, the cleaning section 151 is a section in the suction path 51 in which the need for cleaning is relatively high. This embodiment contributes to the improvement of the cleaning work efficiency of the cleaning section 151 by the structure in which the plurality of pipes 153 forming the cleaning section 151 are connected by the connecting member 160 having the grip portion 161 .
A cleaning section 151 extends from the suction port 14 (or 15 to 17) so that the inside of the pipe 153 can be easily cleaned over almost the entire length from the suction port 14 (or 15 to 17) to the collecting portion 152. It preferably extends from the vicinity to the vicinity of the collecting portion 152 . In the example shown in FIG. 6, the flange of the pipe inserted into the suction port 14 (or 15 to 17) and the flange of the pipe 153 are connected by a connecting member 160. In the example shown in FIG. A flange provided on the collecting portion 152 and a flange of the pipe 153 are connected by a connecting member 160 .

The suction path 51 corresponding to the suction port 14 as well as any of the suction paths 51 corresponding to each of the suction ports 15 - 17 may comprise a cleaning section 151 and a collection portion 152 . Of the suction paths 51 corresponding to each of the suction ports 14 to 17, only at least one suction path 51 that is particularly likely to be clogged with molten metal scum S or the like may be provided with the cleaning section 151 and the collecting portion 152.

The cleaning section 151 has a curved shape as a whole by connecting a plurality of pipes 153 . The plurality of pipes 153 are composed of a straight pipe portion 153A extending linearly and a curved pipe portion 153B. The straight pipe portion 153A and the curved pipe portion 153B are referred to as pipes 153 when not distinguished from each other. When the cleaning section 151 is disassembled into a plurality of pipes 153, the cleaning section 151 is divided into pipes 153 having appropriate lengths so that the work of removing the molten metal scum S and the like adhering to the inner wall of each pipe 153 can be easily performed. be able to.
The flanges of the plurality of pipes 153 are connected to each other by connecting members 160 . The connecting member 160 has a grip portion 161 exposed to the outside of the pipe 153 and can be manually attached to and detached from the flange using the grip portion 161 .

Vacuum lines are typically constructed using steel pipes and threaded joints such as nipples, unions, and elbows, and tools must be used to disassemble these components. .
Unlike a typical vacuum line, the cleaning section 151 of this embodiment can be easily disassembled into multiple pipes 153 manually using the gripper 161 and each pipe 153 can be cleaned. Therefore, it contributes to improvement in work efficiency of cleaning the molten metal scum S and the like adhering to the inner wall of the pipe 153 .

From the above, the vacuum piping structure 150 is
(1) a cleaning section 151 including a plurality of straight pipe portions 153A and a plurality of curved pipe portions 153B;
(2) A collection part 152 (a box for molten metal residue) is provided.
The suction port 14 (or 15 to 17) and the collecting portion 152 are connected by a curved cleaning section 151 formed by combining a straight pipe portion 153A and a curved pipe portion 153B.

The pipe 153 (straight pipe portion 153A and curved pipe portion 153B) does not have flexibility or bendability unlike a bellows pipe (bellows pipe), and is molded into a predetermined shape from an appropriate material such as metal. ing. In addition, while a bellows pipe (bellows pipe) has a shape in which crests and troughs are alternately formed in the longitudinal direction, the pipe 153 of the present embodiment has a corrugated concave-convex shape on the inner periphery. It is preferable to have a smooth inner peripheral surface in order to suppress the adhesion and retention of liquid phase and semi-solidified molten metal scum S and the like.
A bellows pipe or the like may be used as the pipe 153 if the liquid phase or semi-solidified molten metal scum S or the like does not enter the pipe 153 .

An appropriate pipe can be adopted as the pipe 153 as long as the connecting member 160 can be attached and the pipe can be used for vacuum suction.
For example, a carbon steel pipe for piping of Japanese Industrial Standards JIS G 3452 can be used as the straight pipe portion 153A. For example, a NW/KF standard 90° elbow can be used as the bent pipe portion 153B.

In the example shown in FIG. 6, the cleaning section 151 extends upward from the suction port 14 (or 15-17) and curves downward through a horizontally extending portion. One or more straight tube portions 153A can be used for each of the upwardly extending portion, the horizontally extending portion, and the downwardly extending portion from the suction port 14 .
The straight pipe portion 153A used for the upwardly extending portion and the straight pipe portion 153A used for the horizontally extending portion are connected by a curved pipe portion 153B. The straight pipe portion 153A used for the horizontally extending portion and the straight pipe portion 153A used for the downward extending portion are connected by another curved pipe portion 153B.

Note that the cleaning section 151 may be curved in a more complicated shape than the inverted U shape shown. For example, the cleaning section 151 may be configured to include a bend 156 shown in FIG. 11 . The bent tube portion 156 has a first end portion 156A, a bent portion 156B, and a second end portion 156C, and the first end portion 156A and the second end portion 156C are opened in opposite directions. . The axis X1 of the opening of the first end portion 156A and the axis X2 of the opening of the second end portion 156C are parallel to each other and separated in a direction orthogonal to the axial direction of the opening.
When assembling the cleaning section 151 from a plurality of pipes, by relatively rotating the bent pipe portion 156 and other pipes around the axes X1 and X2, manufacturing errors of the pipes can be absorbed. is easy to assemble.

The collecting part 152 collects the molten metal scum S and the like separated from the sucked gas by inertial force and centrifugal force.
The collecting portion 152 and the pipes 153 and 154 communicating with each other through the collecting portion 152 separate and collect the molten metal scum S and the like from the gas.

The collection part 152 connects the pipe 153 and the pipe 154 and stores the molten metal sludge S and the like inside.
A pipe 153 (a straight pipe portion 153A or a curved pipe portion 153B) forming the end of the cleaning section 151 is connected to the collecting portion 152, and a pipe 154 into which the gas from which the molten metal scum S and the like are separated is connected. ing. The collection part 152 and the pipe 154 are integrally formed in the example shown in FIG.

The gas that has flowed downward from the lower end of the straight pipe portion 153A into the inside of the collecting portion 152 is turned toward the pipe 154 inside the collecting portion 152, and has an opening (not shown) in the inner wall of the collecting portion 152. It flows into the pipe 154 from the inlet. In the process in which the gas flowing out from the straight pipe portion 153A flows through the inside of the collecting portion 152, the molten metal scum S and the like, which are heavier and denser than the gas, are separated from the gas by inertial force and centrifugal force, and are separated from the collecting portion 152. It is collected by the inner wall and accumulates inside.
Separation and collection of the molten metal scum S and the like by the collecting part 152 eliminates the need to perform vacuum suction by suppressing the degree of vacuum and the filling rate of the molten metal in the sleeve 11 in order to avoid clogging of the suction path 51 and the like. It is possible to achieve sleeve vacuum suction with a high degree of vacuum and a high filling rate.

Instead of the collecting structure consisting of the collecting portion 152, the straight pipe portion 153A and the pipe 154, another collecting structure such as a collecting structure 130 (FIG. 12) described later can be adopted. The straight pipe portion 153 A corresponds to the first section 131 of the collection structure 130 and the pipe 154 corresponds to the second section 132 of the collection structure 130 .
In addition, a known structure capable of separating and collecting molten metal scum S and the like from gas can be employed.

Next, the connecting member 160 (vacuum piping component) will be described with reference to FIGS. 7 to 9. FIG. The connecting member 160 serves as a pipe joint that enables the connection between the suction port 14 (or 15 to 17) and the pipe 153, the connection between the pipes 153, and the connection between the pipe 153 and the collection part 152 by means of a flange. .

FIG. 7 is an enlarged cross-sectional view of a main part showing the configuration of the connecting member 160, and is a cross-sectional view taken along line VII-VII in FIG.
The connecting member 160 includes a center ring 162 arranged between the adjacent flanges 153F, 153F of the pipe 153, and a clamp 163 that restrains the flanges against each other via the center ring 162.

The clamp 163 includes two or more clamp bodies 163A, 163B positioned around the flanges 153F, 153F and clamping and loosening the clamp bodies 163A, 163B relative to the flanges 153F, 153F, as shown in FIGS. and a gripping portion 161 capable of falling.

As shown in FIG. 7, the center ring 162 is sandwiched between the flange 153F of the pipe 153 and the flange 153F of the other pipe 153, and outside air enters the pipe 153 through the gap between the flanges 153F, 153F. It is formed in a hollow columnar shape (annular shape) to play the role of a seal to prevent this.

7, the center ring 162 includes an O-ring 162A that seals between the flanges 153F and 153F, and a metal ring 162B that supports the O-ring 162A from the inner peripheral side. This center ring 162 preferably has a mesh 162C for suppressing passage of molten metal scum S and the like.
The center ring 162 shown in FIG. 7 is a NW/KF standard center ring with a mesh. Any suitable sealing member may be employed.

The flange 153</b>F is formed at the end of the pipe 153 so as to protrude radially outward of the pipe 153 and has a hollow columnar shape. The flange 153F has a facing surface F1 facing the mating flange 153F and a tapered rear surface F2.
The facing surface F1 is perpendicular to the axis A1 of the pipe 153 .
The tapered back surface F2 is inclined with respect to the axis A1 such that the outer end in the radial direction of the pipe 153 is closer to the mating flange 153F than the inner end. Tapered back surface F 2 contacts tapered inner wall 164 A of clamp 163 .

Flanges (not shown) are also formed at the airflow outlet of the suction port 14 (or 15 to 17) and the airflow inlet of the collecting portion 152, respectively. These flanges can also be formed similar to flange 153F shown in FIG.

Flanges 153F, 153F shown in FIG. 7 are flanges conforming to NW/KF standard, ISO 2861 "Vacuum Technology - Dimensions of clamped-type quick-release couplings", and have similar shapes. However, as long as the flanges 153F, 153F establish the structure of the flange type pipe joint, the flanges 153F, 153F may have any suitable shape, or may have different shapes from each other.
A flange 153F shown in FIG. 7 is connected to the main body of the pipe 153 by welding. This welding work is not always necessary, and a flanged pipe commercially available with the flange 153F provided on the pipe 153 can also be used.

The clamp 163 clamps and fixes the flanges 153F, 153F with the center ring 162 interposed therebetween.
Based on the example shown in FIGS. 7-9, clamp 163:
(1) a first clamp body 163A;
(2) a second clamp body 163B;
(3) a hinge mechanism 165 (hinge mechanism);
(4) a fastening mechanism 166 including the grip portion 161;
In addition to the above, the clamp 163 may have a ratchet mechanism (not shown).

8 shows the clamp 163 in the closed state, and FIG. 9 shows the clamp 163 in the open state.
The first clamp body 163A and the second clamp body 163B are formed in a C shape (arc shape) in plan view, and are arranged so as to surround a flange 153F (not shown in FIG. 8) of the pipe 153 or the like.

As shown in FIG. 7, annular grooves 164 are formed in the first clamp body 163A and the second clamp body 163B to receive the flanges 153F, 153F abutted via the center ring 162, respectively. Inside the groove 164, a tapered inner wall 164A corresponding to the tapered back surface F2 of each of the flanges 153F, 153F is formed.

As shown in FIGS. 8 and 9, a hinge mechanism 165 connects one end of the first clamp body 163A and one end of the second clamp body 163B.
A fastening mechanism 166 is provided at the other end (fastening end) of each of the first clamp body 163A and the second clamp body 163B.

The hinge mechanism 165 has a first pin 165A and a second pin 165B that are arranged along the axial direction of the pipe 153 . The first clamp body 163A is rotatable around the first pin 165A and the second clamp body 163B is rotatable around the second pin 165B. Therefore, as shown in FIG. 9, the clamp is in an open state in which the fastening end of the first clamp body 163A and the fastening end of the second clamp body 163B are open, and in the closed state between these fastening ends. closed state (FIG. 8).

When connecting the pipes 153, 153 by the connecting member 160, as shown in FIG. The flanges 153F, 153F are inserted into the grooves 164 as shown in FIG. Next, as shown in FIG. 8, the first clamp main body 163A and the second clamp main body 163B are fastened by the fastening mechanism 166 to constrain the flanges 153F, 153F.

As shown in FIGS. 7 to 9, the fastening mechanism 166 engages the shaft portion 166A that connects the fastening end portion of the first clamp body 163A and the fastening end portion of the second clamp body 163B, and the shaft portion 166A. It has a wing nut 166C and a washer 166E.
A tip portion of the shaft portion 166A is held on the outer peripheral side of a wall 164B corresponding to the bottom of the groove 164 by a pin 166D passing through the tip portion in the axial direction of the first clamp body 163A. A through hole into which the pin 166D is inserted is formed in the first clamp body 163A. Through holes may be formed in the second clamp body 163B at positions similar to those of the first clamp body 163A, but pins are not inserted into the through holes of the second clamp body 163B.
A portion of the wing nut 166C that protrudes radially outward from the female screw portion corresponds to the grasping portion 161 that is grasped when the clamp 163 is attached to or detached from the flanges 153F, 153F.

Note that the grip portion 161 does not necessarily have to be a part of the wing nut 166C. The gripping portion 161 can be configured appropriately as long as it is possible to grip and attach and detach the connecting member 160 to and from the flanges 153F, 153F. For example, the grip portion 161 may be a knob provided on a nut that engages with the shaft portion 166A in a direction orthogonal to the axial direction of the nut.

When the flanges 153F and 153F are surrounded by the first clamp body 163A and the second clamp body 163B, and the wing nut 166C is manually tightened to the male threaded portion of the shaft portion 166A using the grip portion 161, the first clamp body 163A and the second clamp body 163B are tightened. The second clamp body 163B rotates around the pins 165A and 165B, respectively, and the distance between the first clamp body 163A and the second clamp body 163B is reduced. Therefore, the clamp 163 as a whole is displaced from the radially outer side to the radially inner side and the diameter of the clamp 163 is reduced, so that the tapered inner wall 164A is pressed against the tapered back surface F2 of the flange 153F. Then, due to the wedge effect of both tapered surfaces 164A and F2, a force is generated in the direction to pull the flanges 153F and 153F toward each other in the axial direction of the pipe 153, so that the O-ring 162A is pressed between the flanges 153F and 153F and elastically deformed. , the flanges 153F, 153F are constrained.

Then, the space between the flanges 153</b>F, 153</b>F is airtightly sealed, so that vacuum suction can be performed from inside the sleeve 11 through the suction path 51 . The molten metal scum S and the like mixed in the sucked gas are separated from the gas and collected by the collection unit 152, so that the die casting machine can be operated stably while suppressing the reduction of suction efficiency and clogging of the pipeline. It can be carried out.

When cleaning the cleaning section 151, by manually turning the wing nut 166C using the grip portion 161, as shown in FIG. to remove the first clamp body 163A and the second clamp body 163B from the flanges 153F, 153F.
As a result, the flanges 153F, 153F of the pipe 153 and the like are disconnected by the connecting member 160, so that the cleaning section 151 can be disassembled into a plurality of pipes 153 and the like and cleaned by an appropriate method.
For example, by blowing air, the molten metal scum S and the like are removed from the inner peripheral portion of the pipe 153, or a rod-shaped member is inserted into the pipe 153, and the molten metal scum S and the like are removed from the inside of the pipe 153 by the rod-shaped member. It can be peeled off from the periphery. The smooth inner wall of the pipe 153 makes it easier to remove adhering molten metal scum S and the like than the uneven inner wall of the bellows pipe.
Incidentally, if it is difficult to remove the molten metal scum S, the pipe 153 may be replaced with a spare pipe 153 .

According to the first embodiment described above, the pipes 153 can be manually connected or disconnected using the grasping portion 161 of the connecting member 160 without using a tool. It is possible to disassemble the cleaning section 151 for cleaning and assemble the pipe 153 after cleaning in a short time.

The clamp 163 shown in FIGS. 7 to 9 is a vacuum pipe clamp that fastens NW/KF standard flanges together, but this is only an example. As long as the clamp 163 is exposed to the outside of the pipe 153 and has a grip that allows the clamp body to be manually tightened or loosened with respect to the flange, the clamp 163 can be attached to or detached from the flange by the grip. A suitably configured clamp can be employed instead.
For example, it includes a chain formed by connecting a plurality of (for example, four) links (clamp bodies) formed with grooves for receiving the flanges 153F and 153F, and a knob (grasping portion) for tightening both ends of the chain with screws. A chain-type clamp can be employed. When the knob is grasped and rotated around the axis of the screw to reduce the diameter of the chain, the flanges 153F, 153F are restrained inside the chain.

[Modification of First Embodiment]
The cleaning section 155 shown in FIG. 10 may extend upward from the suction port 14 (or 15-17) and curve horizontally toward the collecting section 152 . A collection part 152 is connected to the horizontal portion 155H of the cleaning section 155 .
Also, although illustration is omitted, the cleaning section may include an inverted U-shaped curved portion similar to the cleaning section 151 (FIG. 6) described above, and a horizontally extending portion continuing from the curved portion. good. In that case, the collection part 152 can also be connected to the horizontally extending portion.

[Second embodiment]
Referring to FIG. 12, a structure relating to a suction path 52 through which gas is sucked from the cavity 23 through cavity suction ports (connection ports 28) formed in the molds 21 and 22 will be described.
The suction path 52 includes a vacuum tank and a vacuum pump, like the suction path 51 (FIG. 2) connected to the suction ports 14 to 17 of the sleeve 11 .
The suction path 52 includes the vacuum piping structure 150 and the connecting member 160 of the first embodiment described above.

In the example shown in FIG. 12 , a collecting structure 130 having a collecting portion 134 is provided in the middle of a suction path 52 through which gas is sucked from the cavity 23 through the connection port 28 of the molds 21 and 22 . The suction path 52 includes a cleaning section 151 extending from the vicinity of the connection port 28 to the vicinity of the collecting portion 134 .
In addition, the suction path 52 may be provided with the collecting portion 152 ( FIG. 6 ) of the first embodiment instead of the collecting structure 130 .

The collection structure 130 includes a collection portion 134 that is provided in the middle of the suction path 52 and collects the molten metal waste S and the like, a first section 131 of the suction path 52 that extends from the upstream side toward the collection portion 134, A section connecting portion 133 that surrounds the first section 131 from the outside and extends beyond the first section 131 to the collecting section 134, and a section connecting section 133 at a position where the first section 131 is surrounded by the section connecting section 133. and a second section 132 of the continuous suction path 52 . The first section 131 and the second section 132 communicate with each other through the inside of the section connecting portion 133 .
According to the collection structure 130, since the side wall of the first section 131 exists between the outlet of the first section 131 and the inlet of the second section 132, the gas flowing out of the first section 131 is In the process of going around the outer periphery of the side wall of the first section 131 and flowing into the second section 132, while obtaining the effect of separating the molten metal scum S and the like from the gas due to inertial force and centrifugal force, the pipe wall of the first section 131 Also, it is possible to obtain the separation effect of the molten metal scum S and the like by the collision of the airflow to the vicinity of the inlet of the second section 132 . As a result, the gas from which the molten metal slag S and the like are sufficiently separated flows into the second section 132 .

According to the second embodiment, the molten metal scum S and the like mixed in the gas sucked into the suction path 52 from the cavity 23 through the connection port 28 are separated from the gas by the collecting structure 130 and collected inside the collecting portion 134. can be collected. Therefore, it is possible to prevent the molten metal scum S and the like from flowing out to the downstream side of the suction path 52 and prevent the suction efficiency of the suction path 52 from being lowered and clogging.
In addition, the cleaning section 151 can be easily disassembled into a plurality of pipes 153 by the connecting member 160 having the grip portion 161 (FIGS. 8 and 9), and the molten metal scum S and the like adhering to each pipe 153 and the collecting portion 134 can be removed. can be cleaned.

Further, the present invention also includes an embodiment of an air blow operation as described below.
When the vacuum/air blow switching valve 35 is switched to perform the air blowing operation of the suction path 51 communicating with the suction ports 14 to 17, for example, all the suction port selection valves 33 are opened, and the pressurized tank 38 is switched to the suction port 14. Release air toward ~17. In this case, if all the suction port selection valves 33 are opened at the same time and the air is blown, air is preferentially supplied to the suction passage 51 that is not clogged rather than to the suction passage 51 that is clogged. It is difficult to detect clogging of 14 to 17 and piping (suction path 51). Therefore, by sequentially opening the suction port selection valves 33 of the first suction port 14, the second suction port 15, the third suction port 16, and the fourth suction port 17 one by one for a certain period of time, the molten metal such as aluminum scum can be removed. The scum (molten metal scum S) is removed from each pipe (each suction path 51), and clogging of each suction port 14 to 17 and each pipe (each suction path 51) is detected by each pressure gauge 32 during air blowing. Good luck. This is a device necessary when there are a plurality of suction ports (first suction port 14, second suction port 15, third suction port 16, fourth suction port 17). Other configurations are the same as those of the embodiment shown in FIG.

Since this embodiment has the above configuration, the following effects can be obtained.
By providing multiple sleeve-side suction ports on the sleeve and installing a suction port selection valve on each suction path that communicates with each suction port, it is possible to select whether or not to use the suction ports, resulting in the following effects. bottom.

(1) Reduction of defects and stable production Since multiple suction ports are provided on the sleeve side, the suction area is increased, and a high vacuum state can be achieved efficiently.

(2) Countermeasures against Clogging of Molten Metal Residue The suction port and suction path, which are likely to be clogged with molten metal scum such as aluminum scum, can be dispensed with by the suction port selection valve. That is, the vacuum suction time of the sleeve-side suction port and the sleeve-side suction path, which are likely to be clogged with molten metal residue such as aluminum residue, can be shortened, and clogging with molten metal residue such as aluminum residue can be suppressed.

(3) Stable production Since multiple suction ports are provided on the sleeve side, it is possible to vacuum using suction ports other than the unused suction ports. It enables stable production of good products without interruption.

(4) Increased versatility and cost reduction Since it is not necessary to prepare a sleeve each time according to the mold or product, it leads to cost reduction. Therefore, the number of types of sleeves to be possessed is reduced, and management is facilitated. Furthermore, the time for exchanging the sleeve can be reduced.

(5) Reduction of defects Since the area of the suction port on the sleeve side can be made larger than the area of the suction port on the mold side, an effect of preventing preceding molten metal due to vacuuming can be expected. By starting the vacuum suction on the sleeve side earlier than the vacuum suction on the mold side, it is possible to prevent preheating more effectively. This reduces defects such as chipping, peeling, and stripping for shot blast. It is possible.

(6) Adjustable Vacuum Suction Time for Each Suction Port By providing a suction port selection valve, it is possible to adjust the vacuum suction time for each suction port according to the position, time, filling rate, and the like.

(7) Stable production by suppressing the pressure rise of the vacuum tank Since the injection plunger 12 can close the sleeve side suction port immediately after (or during passage) passing through the sleeve side suction port, the pressure rise of the vacuum tank can be suppressed. , the vacuum suction capability of the sleeve-side suction port located far from the pouring port to which the injection plunger 12 has not reached is not lowered.

(8) Since the injection plunger 12 can be set to evacuate until just before the completion of passing through each sleeve side suction port, it is possible to evacuate through the gap between the injection plunger 12 and the sleeve. , the intrusion of outside air into the sleeve in the negative pressure state can be suppressed.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a structure of a vacuum pipe for a die casting machine having excellent effects, and the space formed by communicating from the inner space of the sleeve to the cavity can be vacuum-sucked. It can be used and contributed in the field related to the structure of the vacuum piping of the die casting machine.

100 Die casting machine 1 Injection device 2 Vacuum device 4 Movable platen 5 Fixed platen 7 Tie bar 8 Machine base 10 Hole 11 Sleeve 12 Injection plunger 13 Pouring port 14 Suction port (first suction port)
15 suction port (second suction port)
16 suction port (third suction port)
17 suction port (fourth suction port)
18 Molten metal 19 Plunger rod 21 Fixed mold 22 Movable mold 23 Cavity 24 Runner 25 Gate 27 Chill vent 28 Connection port (suction port)
31 vacuum filter 32 pressure gauge 33 suction port selection valve 34 distribution valve 35 vacuum/air blow switching valve 36 vacuum tank 37 vacuum pump 38 pressurization tank 39 air source 40 pressure gauge 41 ejection plate 42 ejection pin 43 ladle 51 suction path 52 suction path 55 Piping 56 Piping 130 Collection structure 131 First section 132 Second section 133 Section connection section 134 Collection section 150 Vacuum piping structure 151 Cleaning section 152 Collection section 153 Pipe 153A Straight pipe section 153B Bent pipe section 153F Flange (second section 1 flange, 2nd flange)
154 Piping 155 Cleaning section 156 Bent pipe portion 156A First end portion 156B Bent portion 156C Second end portion 160 Connecting member 161 Grip portion 162 Center ring 162A O-ring 162B Metal ring 162C Mesh 163 Clamp 163A Clamp body (first body)
163B Clamp body (second body)
164 Groove 164A Taper inner wall 164B Wall 165 Hinge mechanism 165A, 165B Pin 166 Fastening mechanism 166A Shaft 166C Wing nut 166D Pin 166E Washer A Circuit A1 Axis line F1 Opposing surface F2 Taper back surface S Molten metal waste X1, X2 Axial center

Claims (4)

In the structure of a vacuum pipe of a die casting machine for vacuum suction in a space formed by communicating from the inner space of the sleeve to the cavity of the mold,
a collecting part provided in the middle of a suction path through which gas is sucked through a suction port formed in the sleeve and collecting molten metal scum mixed in the gas;
a cleaning section, which is at least part of the suction path and extends from the upstream side of the collecting section toward the collecting section, through which the gas mixed with the molten metal scum flows ;
The cleaning section has a curved shape from a plurality of pipes whose flanges are connected by connecting members,
The connecting member has a gripping portion exposed to the outside of the pipe, and is detachable from the flange by the gripping portion,
The collecting part is
A box for molten metal slag having a collection gap inside;
an inflow pipe that connects the pipe that constitutes the cleaning section and the box for molten metal slag, and into which the gas that has flowed through the cleaning section flows;
an outflow pipe connected to the box for molten metal slag and through which the gas flowing into the box for molten metal slag flows out,
A vacuum pipe structure for a die casting machine, wherein the gas outlet of the inflow pipe is provided below the gas inlet of the outflow pipe.
The connecting member is
a centering ring disposed between the flanges;
a clamp that constrains the flanges to abut against each other via the center ring;
The clamp is
two or more clamp bodies positioned around the flange;
said gripping portion capable of tightening or loosening said clamp body with respect to said flange;
A vacuum pipe structure for a die casting machine according to claim 1.
The cleaning section is at least
A first straight pipe portion connected to the sleeve, a curved pipe portion connected to the first straight pipe portion, and a second straight pipe portion connected to the curved pipe portion,
The first straight pipe portion and the curved pipe portion, and the second straight pipe portion and the curved pipe portion are combined by using a vacuum piping component that allows the flanges to be manually attached and detached . formed,
By manually removing any one of the first straight pipe portion , the second straight pipe portion and the curved pipe portion, the inside of the first straight pipe portion , the inside of the second straight pipe portion and the curved pipe portion are removed. 2. A structure of a vacuum pipe for a die casting machine according to claim 1, characterized in that it is possible to clean off molten metal scum adhering to any part of the inside of the pipe.
The vacuum piping component comprises a center ring, a first flange, a second flange and a clamp,
the clamp comprises a first body, a second body, a hinge mechanism, and a wing nut;
4. The vacuum for a die casting machine according to claim 3, wherein the wing nut can be manually turned to fix the first flange and the second flange by tightening or release the tightening fixation. The structure of the plumbing.

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