JPS60221162A - Metal injection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to metal injection equipment for die casting machines, and more particularly to metal injection equipment for die casting systems including balanced dual motion die casting machines. Die-casting machines of the type described above contain two pairs of spaced apart parallel cylinder assemblies, each supporting a mold half, the pistons of the cylinders being mounted to the machine frame and the cylinders being connected to the pistons. moving above.

A normal die-casting machine is equipped with a frame, and a fixed or stationary plate is numbered on the frame, and a half member of a mold for making a cast part is mounted on the plate. There is. The other half of the mold is mounted on a movable plate, the presence of which allows the casting part to fall out of the die-casting machine in the open position. The movable plate is closed and clamped with sufficient force to contain the molten metal while the mold is being filled. In operation, the casting part separates from the mold half (cover half) on the fixed plate, and the mold half (ejector half) on the movable plate releases the molten part that is injected into the mold cavity. Retained during transfer after solidification of metal. The part held on the movable or ejector half of the mold must then be ejected and dropped or removed from the die casting machine. The aforementioned unilateral motion is a major cause of the need for various and complex types of automatic part handling machines in connection with conventional casting machines. A similar problem occurs when a part is indexed to a secondary operation such as trimming, in which a similar unidirectional machine is used. The component transport carrier must provide indexing and lateral movement compatible with the plate opening and opening strokes when the casting component is in a fixed position for the desired operation.

Such a conventional die-casting machine is covered by U.S. Patent No. 4.0.
No. 13,116 (published March 22, 1977).

This machine is considerably simpler than previous machines because the casting parts are cast without any lateral movement;
The point is that it is indexed and removed from the machine. During the processing process, the casting part lies in a fixed plane and is transported within this fixed plane. This casting machine receives balanced forces,
Both the plate of the die and the mold halves are moving equidistantly from or toward the part plane, so that such balanced movement of the material m causes the starting and starting of the hanging plate and the tool. Shocks during shutdown are canceled out, thermal expansion differences are equalized and load deflections are automatically aligned.

Although the balanced, aligned, single-sided die-casting machine of U.S. Pat. Additional features have been added, examples of which are as follows. First, a low-mass cable conveyor is installed, which simplifies the structure for transporting casting parts from the machine.A simple carrier fin is installed on the center line of the mold, and metal injection is carried out on the mold parting line. The stroke of the plate movement is half of the normal amount, therefore the non-productive time for opening and closing the machine is halved, and the upper core bin is placed on the parting line. It stabilizes the part position during the cage mold opening, thereby eliminating the need for ejector pins for some parts, allows the addition of internal cores within both mold halves, and allows mold and trim die During installation, the assembly gap is automatically obtained, etc. The machine of the present invention is constructed as a whole integrated casting unit and is capable of automatically casting and trimming quality casting parts at current production speeds. From this point of view, the die casting apparatus including the metal injection apparatus of the present invention incorporates many features and is formed as a single unit.

The main mechanical parts consist of a frame, a mold equipment plate and a hydraulic closing and opening cylinder with a simple reduction system to eliminate mold closing shocks.

A standard, uniform, basic mold profile is provided that can be adapted to a wide range of part types and that prevents mold matching failures due to thermal expansion or poor die setting techniques. A predetermined positioning within the machine plate is provided to eliminate this.

The metal injection section of the machine is equipped with an infinitely variable control that can be preset to the desired speed or pressure, as well as a self-contained molten metal supply member with an internal electrical resistance heater.

It also includes a self-contained hydraulic power system using non-flammable fluids. Also included is a means for preheating the mold prior to first charging the mold. The equipment has a self-contained heating unit to cool the mold and remove lime deposits in the cooling passages, which automatically heats the mold during installation without the use of hoses or pipes. Can be connected. A cable conveyor is also provided which transports the casting part on fingers to other secondary operations with sufficient time before trimming so that the casting part is free of distortion prior to trimming. It is cooled without any problem. Also located along with the conveyor is a complementary one-limb machine and basic die structure for extruding parts from the die to the output conveyor.

According to one feature of the invention, a metal injection device for a die-casting machine includes a gun head 3 and a nozzle device for injecting molten metal on a parting line between mold halves of the die-casting machine; In order to continuously discharge a predetermined amount of unsolidified metal from the runner in the die, a first cylinder is provided with a charging piston and a charging chamber formed at the lower end of the cylinder. the dosing piston, on an upward movement, fills the dosing chamber with molten metal from a metal supply and, on a downward movement, injects molten metal from the dosing chamber into a cavity of the mold. and then immediately remove the input pressure to cause the unsolidified metal in the runners of the mold to be discharged back from the nozzle arrangement, thereby including a second cylinder and incorporating a selector valve, the selector valve being , in one position opens a first passage from the metal supply to the input chamber of the first cylinder, while at the same time opening a second passage from the input chamber to the nozzle arrangement of the injection device using rf
f casting and at another position closing the first passage and simultaneously listening to the second passage, the selector valve being disposed between the input chamber and the second passage; A metal injection device is provided.

The present invention will be described in more detail below with reference to the accompanying drawings.

1-3, a die casting system according to the present invention includes a die casting apparatus 10 having a frame 12 with two pairs of spaced apart, parallel cylinder assembly holes 14, 16. ing.

Multiple pairs of assemblies 14 support mold halves 18 as shown in FIG. 3 and are positioned opposite other pairs of assemblies 16 carrying other mold halves 20. has been done. As best seen in the general layout of FIG. 3, the multi-pair cylinder assembly includes a stationary piston 22 mounted to the frame 12 and a piston mounted coaxially and axially aligned with one end of the piston. shaft 2
4, the shaft 24 extending across the center of the machine and connected at its other end to an opposing piston 26 of another cylinder assembly 16.

As illustrated in FIG. 3, each cylinder assembly 1416 includes a cylinder mounted on a respective piston 22,26;
The crown or skirt end 6 of each of these pistons
and a shaft 24 for reciprocating said cylinder in response to hydraulic fluid injected onto said fluid assembly 14.16 and their associated mold halves. The split member moves to an open or closed (as shown) position.

For a more detailed explanation of the basic concept of device 10, see US Pat. No. 4,013,116.

Referring now to FIG. 1, a top view of the apparatus 10 is shown showing the mold clamp cylinders 14, 16, the platen 32, the die separation and ejection cylinders 34, the blocking blocks 36 to prevent accidental movement of the cylinders, and the transport mechanism. A drive unit 38 is shown for the purpose.

FIG. 2 illustrates a discharge lid assembly 40, the assembly 4
0 has a head 44 of the furnace 42 with a dosing and selector valve 46,48 and a dosing valve locking system 50. Nozzle 52 directs the zinc charge into mold 54;
The carrier fins 58 serve to provide a casting 56 that is cast into a carrier fin 58 on a transport mechanism 60 that transports the cast part to a refinishing station.

Die-casting equipment requires only a small nominal force to advance the mold to the open position shown in Figure 3, but then applies a strong clamping force to the induced force as the casting material is introduced into the mold. A high internal pressure must be maintained. Therefore, when using a cylinder large enough to clamp the mold, a large volume is required to fill the mold during the closing stroke. As shown in FIGS. 1 to 3, the device according to the invention is a two-bar type device, with each end of the two shafts 24 connected to two stationary pistons on each side of the device. It extends through the hollow center of 22°26. 3, the piston has rod extensions 22a and 2 on its skirt end.
6a, but these extensions are of smaller diameter than the skirt ends of the pistons, thus creating two slightly different pressure receiving areas at each end of the surrounding cylinder 28.30. Note that the cylinders 28 and 30 are moving members that are connected to the machine platen 3 on each side of the center of the machine.
It is formed integrally with 2. Therefore, by pressurizing both the crown end 62 and the skirt end 64 of each cylinder and providing an internal flow path from the small pressure area 64 to the large pressure area 62, it is necessary to stroke the cylinder in one direction. The fluid volume assumed to be simply two areas 6
The difference is 2°64×stroke amount. When closed as in FIG. 3, the pressure on the small area 64 is returned to the tank and the full force on the large area 62 can be used to clamp the die being closed.

The evacuation cylinder 34 is used for die opening as the previously described system only acts on die closure.

Cylinder 34 is also a 20-tube type cylinder that utilizes a relatively small net receiving area, thus requiring only minimal hydraulic flow volume. The cylinder 34 is pressed against a fixed outer stop 35 (FIG. 3) and is retracted after opening the device to remove the stripper bin plate (FIG. 3).
Figure).

We have found that this system provides substantial fluid volume savings.

Die casting in a permanent mold involves transferring heat from a molten metal alloy to the walls of a die cavity and from the cavity to a heat exchange medium. Therefore, certain parameters must be maintained to obtain the desired heat flow.

In the system according to the invention, the heat exchange medium is water, and the electric immersion heater is used simply to preheat the die to the operating temperature, and then by controlling the internal pressure of the die cooling cavity, the boiling point of the water is increased. The above temperature can be obtained. Note that the actual heat removal is accomplished by vaporization of the water as it flows through the system for a period of time.

The system is shown diagrammatically in FIG.
This figure shows the die placed in the mold manifold 68 near the cavity surface 70, for example, at 400'F (204'F).
An immersion heater 66 is shown for preheating to an operating temperature of 0.degree. C.). The water passage 72 in which the heater is immersed communicates with a cooling passage 74, which communicates with an inlet and an outlet 0 valve 76, 78, respectively.

The surface within the die cavity that is exposed to the molten metal vI alloy is
It is proportional to the area of the cooling surface exposed to water, and the distance between these two surfaces is sized according to the heat transfer rate of the die cavity material.

The only heat transfer from the die block to the water is evaporative cooling.

The temperature of the water in the cooling passages 72 of the die is maintained at a high temperature that allows for a good IIF finish during metal loading. When the part is then cast, excess heat is carried away by boiling occurring only where superheat conditions exist. Therefore, no water circulation or flow is required within the die passageway 72. Since steam is generated in direct proportion to the heat removed from the molten metal, a slightly larger volume of repair water may be injected than the steam escaping through the pressure relief valve 78.

As shown diagrammatically in FIG. 4, water from the holding tank 80tfi is injected into the cooling passage 72 via the intake valve 76 by a pumping device 82. Valve 76 is now at a pressure slightly greater than the pressure of the water being vaporized. Dia 0 to passage 7
When the heat transferred to 2 boils the water in passage 72, valve 78 opens under steam pressure, allowing the steam to escape via manifold passage ff184 and pipe 86, where it condenses. Then return to tank 80.

The heat transfer system is integral to the mold structure and function and has precise flow adjustments that can be applied to various mold conditions. The heat transfer system is characterized by the fact that no hose handles are required and the ability to regulate flow is not interrupted when changing from one operation to the next.

The metal injection unit according to the invention, designated 40 in FIG. 2, differs in principle from conventional systems in a number of ways, which provides performance and safety features. In fact, the only similarity to conventional systems is that the system applies a force to a piston to drive it, causing the piston to induce fluid pressure that fills the mold cavity.

The injection unit 40 is suspended within a feed crucible 42 (FIG. 5) having a 2N steel wall construction with an inner wall 106 and an outer wall 108 separated by webs 110. With such a structure, it is possible to obtain the strength effect of a continuous large H-shaped steel that resists the internal force caused by molten metal, and also to obtain the insulation effect of an air gap type. Inside the crucible 42 is the vermiculite board 1
The board is lined with a suitable insulating material such as 12 and has a castable refractory lining 114 affixed to the board.

The temperature of the molten metal within crucible 42 is maintained at a desired level by a plurality of electrical immersion heaters 116 (see also FIG. 8a) spaced within crucible 42. Each heater 116
The heater has an element 118 encased within the stainless steel tube 120 to protect it from corrosion, which serves to increase the surface area exposed to the cast alloy and reduce thermal density.

Injection of metal into the die cavity is accomplished by an injection assembly generally designated 40 in FIG.

As shown in detail in FIGS. 8a, 8b, and 10, the assembly 40 has a steel body 122, which includes arms supporting assembly mounting rounds 90 from the machine frame 12. It is suspended in the area of the furnace crucible 42 by 88 . Here, the crown 90 is connected to the body 122 by a long stud 92.

The body 122 is a piston 128 of the closing valve body 46.
a large-diameter cylinder 124 that houses the selector assembly 48;
A small diameter cylinder 126 that accommodates a valve 130 is built in.

As shown schematically in FIGS. 6 and 7, the piston 1
28 amplifies the pressure of the cast metal flowing into the die, and valve 13
Depending on its vertical position, 0 selects the flow path from the crucible source to fill the pressure amplification chamber 132 at the bottom of the cylinder 12'5, or 1 selects the flow path from the piston 128 to the die.

(FIG. 7) The chamber 132 is connected to the passage 134 in the cancer neck 44 and the conduit 1.
36 to the selector cylinder 126.

As shown enlarged in FIG. 9, selector valve 130 includes an upper head 100 and a lower head 102 interconnected by a reduced diameter stem 104. Depending on the mode of operation, the upper head 100 engages the valve seat 140 and the lower head engages the valve seat 142. The mandrel has upper and lower arms 144, 146 which slidably engage portions of the cylinder 126 so that cast metal passes between the cylinder wall and the mandrel body. This creates sufficient room for

During intervals of the machine cycle, selector valve 130 is held in a closed position with respect to nozzle conduit 136 but in an open position with respect to crucible 42. This position is head 1
00 is at the apex position of the stroke "S" where valve seat 140 engages, ie, the "hold and refill" position shown by the dotted line in FIG. In this shutoff position, the valve 130 constitutes a positive safeguard against accidental flow to the machine nozzle. On the next cycle sequential signal the valve 130 shifts to its bottom position as shown in FIG.
The input mode (arrow A) is now ready.

The valve 130 is actuated vertically by a ram 148 connected to the valve via a frame having a piston rod 150, which is connected to the piston rod from upper and lower horizontal cross arms 152, 154 and a vertical arm 156. It is attached to a frame.

The dosing cylinder 96 and in particular the piston 94 within it are actuated by an external pressure source which supplies a corresponding volume of infinitely variable air pressure to its underside. Briefly, the dosing cylinder 124 is cycled to simultaneously fill the mold cavity and withdraw pressure. Since the thickness of the spout of the casting mold is thinner than the cross-sectional area of the casting, the thick portion of the spout solidifies first and solidifies in a fraction of a second.

Therefore, a momentary reversal of pressure will have no adverse effect on the casting, but rather the unsolidified metal within the large intake runner section will be evacuated and the tubular material slush-cast into the casting part, as described further below. A state is obtained in which the runner part adheres. The operating principle of such a duct has several advantages. First, there is no loss of valuable cycle time by having heavy runner sections solidify. Second, the tubular section of the casting is extremely strong, so it provides a lightweight frame for transporting the casting from the mold. That is, the runner and the cast part emerge at the same temperature, thus having a favorable effect on dimensional stability before retouching. Also, less heat is transferred to the runner fIA area of the mold, and the hollow i-way reduces remelting costs. Furthermore, since the cast metal discharged from the runner is retained at a point slightly inside the top nozzle tip, the amount of air that must be discharged from the poetic cavity can be reduced.

Referring now to FIG. 8a, the piston 128 is shown in its maximum closing position at the bottom of the stroke rSJ of the ramrod 96. Once the mold is completely filled,
Piston 128 stops.

In this case, the flow of molten metal passes through the open boat of the valve 130 (arrow A1, FIG. 9). A few fractions of a second after the injection is completed and the inlet has solidified, the piston 128
is displaced upwardly by the pressure acting on the underside of the piston 94. The feed rate in this case is volumetrically equal to the amount of metal contained within the runner system of the IJ die up to a point just inside the nozzle tip. At this moment, the piston 128 is captured in its upward movement long enough to cause the selector valve 130 to displace the nozzle and the metal column in the gunshot S-tube 136 and hold it in a rest position while the piston and open it to the "Hold and Refill" position shown in FIG. The feed in tube 42 thus communicates into chamber 132 . Piston 128 returns to its uppermost position at the next signal and cylinder 124 can be refilled.

Although a pressure accumulator can be provided in the injection cylinder 98,
The accumulator includes a variable pressure air precharge system that provides a constant pressure source to cylinder 98. However, the precharging system can vary the pressure indefinitely as required for a particular casting. The injection process takes place when the opposing fluid pressure is discharged and released, and the piston 94 moves to the eighth position when the fluid pressure is reapplied.
It is returned to the starting position in figure a. However, the initial movement of the dosing and reversing action is accomplished by an auxiliary hydraulic displacement cylinder with an adjustable stroke to inject a controlled amount of fluid into the dosing and reversing circuit. This action causes the input piston 128 to retract, and instead, the unsolidified VI metal forming metal in the runner of the die is discharged to provide a space for the shell-molded hollow portion described above.

An accumulator type storage is provided to receive the fluid discharged from the input cylinder. The fluid thus discharged is of the order of 500 o, p, +n, and the reservoir slowly discharges the fluid into the tank during a machine cycle.

The safety restraint or "kill" system is indicated generally at 141 in FIGS. MB2 and 12. This device prevents the dosing mechanism from operating when the machine is being adjusted and when the "dosing" mode is not selected.

That is, the ram rod 96 is provided with a cam flange 143 that is fitted with a pair of locking collars 145. when the ram 96 and piston 94 are on their upward stroke.
147 and momentarily displaces it. Flange 143 is thus seated within socket 149. Color 1
45.147 is maintained in the closed position of FIG. 12 by spring 149 and is opened against the spring pressure by upward movement of flange 143. Once flange 143 is seated within socket 149, pistons 94 and 96 cannot be moved downwardly as the closure collars engage the underside of flange 143.

As shown in FIG.
1 and mesh with each other with teeth 153.

Collar 147 includes wings 155 that are held in a closed position by springs 149 over bins 156 that are slid within member 157.

Actuator 158 has a rod 159 acting on the other side of wing 155. When actuator 158 displaces rod 159, collars 145 and 147 open to allow ramrod 96 to advance downwardly.

The entire injection assembly is suspended and supported by a cantilever frame consisting of arms 88 and cross plates 89 bolted to the casting machine frame 12. Alignment of the assembly is accomplished by a screw 160 that moves linearly along the axis or centerline of the cancer neck 44 and by a screw 162 that moves vertically and a screw 164 that moves horizontally from side to side. A ball and socket joint 166 is used to align the nozzle tip with the casting die in plane X-X (Figure 8b), and the socket is loosened slightly during alignment so that It is possible to align the nozzle tip with the casting guide by axial movement.

As can be seen from FIG.
68.169, and these surfaces are defined by lines A and m
It is parallel to the center line of the poem head 44 extended to B. Crown 90 has shoes 170 that rest on surfaces 168 and 169.
By adjusting the screw 160, the assembly moves in a straight line.

The sequential operation of the metal injection system is as follows.

When the mold closing signal is generated, the input selector valve 130
moves to the downward position of FIG. 9 and contacts the position sensor.

The position sensor then generates a signal that causes the restraint system to retract, causing movement of the actuator to retract collar 145.
147 is released from the ram flange 143.

The suppression sensor deactivates the metal injection/feeding piston 94 and starts the timer. The timer is cast-in [1
A signal is given to the partial retraction system after a delay of a fraction of a second to allow time for the metal within to solidify and then eject the runner core. The end of the time delay causes the input selector valve 130 to return to its upward position.

When the selector valve 130 reaches the raised position, the closing cylinder 94
receives a signal and returns to its upper position, and the suppression system again moves to its locking position.

As shown in Figure 8b, a nozzle extension is provided to bridge the distance from pressure amplifier 128 to casting die 54 (Figure 2). Referring to FIG. 11, the extension includes an adjustable joint joint, generally designated 184, which connects the distal end 186 of the cancer neck with the extension 188.

The bent end 186 is machined to provide a peripheral flange 190 and an adjacent slot 192. Extension 188 terminates in a spherical end 194 to form conduit 136 when end 194 and end 186 are properly aligned. These two ends are held in alignment by a pair of clamps 196, 198 secured together by bolts 20o as shown. The clamp blocks 196, 198 are also equipped with a plurality of cartridge heaters 202 to maintain proper temperature levels at the connections.

As stated at the beginning of this specification, the die casting apparatus or machine according to the present invention utilizes "parting line" injection, where the molten cast metal entering the die is placed at the parting line of the mold and It passes through a conduit 136 centered on the parting line at the periphery on one side of the parting line. Of course, there must be a leak-tight seal providing a fluid-tight seal with the nozzle when the mold is closed, but at the same time there must be freedom so that no sticking occurs when the mold is opened. When using a conventional nozzle tip with a circular shape, the mold is provided with two semicircular members that close around it, so that a zero clearance angle exists at the mold parting line where the two corners of the semicircles touch the diameter. You must do so. This is because leakproof seals require an interference fit, so some opening friction is inevitable. To overcome this drawback and to solve other related problems, square diamond shaped nozzles are used, as shown schematically in FIGS. 13 and 14. A similar profile is used for carrier fingers 58 (FIG. 22), the purpose of which will be explained below.

As shown in FIGS. 13 and 14, the mold half 68 is provided with an insert 206, and although not shown, the square nozzle 204 is formed when the half 68 is closed around it. Slightly larger than the square hole formed for the nozzle. The variation dimensions of the parting line in the nozzle relative to mechanical alignment are in the range of ±5.08 to 7.62 m, and these dimensions are accommodated by the elastic movement of the injection assembly.

The insert provides an opportunity for precision fitting of the parts involved. All of the nozzle and mold surfaces experience the same unit force during mold closure, as well as providing a highly accurate cam system that brings the two mold halves into proper alignment.

A preferred embodiment of a nozzle with a multi-cut configuration is illustrated in FIGS. 15 and 16, in which the nozzle 208 has slightly rounded or truncated corners 210, allowing both types of It includes a flat surface 212 that is laterally aligned with the insert 206 on the half member 68. In addition, as shown in Figure 16,
The nozzle has angular surfaces (in side view) 214 and 21
6, and these surfaces meet similar surfaces within the mold half insert 206 to provide proper linear alignment.

FIG. 16 also illustrates a cross-sectional view of flash guard 236, which includes reduced diameter surface 220.
and an adjacent curve, a shoulder 222 and an associated pocket 226 and its offlet surface 228. If for any reason molten metal were to leak from the nozzle tip under pressure, the resulting flash would be directed by shoulder 222 into pocket 226 according to arrow F.

The desired temperature of the nozzle 208 is maintained by a nozzle cover 248 surrounding a suitable insulating member 250, which in turn surrounds an electric heater 252.

FIG. 17 shows an example of a mold for this device.

One of the fundamental advantages of the present system over conventional systems is the almost perfect thermal balance between the mold halves 68 and the simultaneous isolation of the die away from the casing. Cast parts can be manufactured without stripper pins when there is no core bin and there is sufficient draft. However, with or without the stripper, the cast part is supported at three points around the periphery of the frame in which it is cast. These three points form a reference plane from which the cast part is subsequently removed from the apparatus.

As shown in Figure 17, the nozzle is used to heat the casting in the mold.
The intake runner 254 is in the casting area 25.
6 and a mold section 258 which brings the casting around the conveying fingers 58 shown in FIG. Another pour runner 260 extends from the intake runner into the mold body 262'' (in this case the logo DBM and surrounding frame), and the outlet runner extends upwardly to accommodate the upper core slide 264. Therefore, when the die halves 68 are simultaneously separated, the casting is (a) upper core slide 264
, (b) nozzle population 256 and (C) conveyance finger 25
8, the part 262 is then conveyed to the exterior of the machine by fingers 58 as described with reference to FIG.

In addition, when upper support core 264 becomes a core to form part of a casting, it also serves as a third support point at the frontage of the mold, effectively eliminating the need for a stripper bin. Eliminate sex.

In conventional die casting machines, the casting part typically follows the ejector half of the mold as the ejector half is pulled away from the cover half.

Then, near the end of the opening stroke, the ejector bin extends and pushes the casting part away from the mold surface. In order to keep the cast parts free from the bottle surface, a separate plate is used which counteracts the tendency of the parts to stick on the bottle. This device is usually a "quick ejector"
It actually works to peck out the cast part from its original work surface.

In the case of the device according to the invention, where the cast part must be kept in its original working plane, a "quick ejector" structure cannot be used.

In addition, the cast part must be held in a fixed plane when the mold halves are opened. The die casting apparatus according to the invention therefore requires a completely different type of part ejector for loosening the casting part from the mold and holding it in this desired fixed position. Therefore, a device is provided for simultaneously loosening and retracting the pin to hold the part in the centerline of the machine while simultaneously attaching one end of the part to the delivery finger 58 and leaving the other end pressed against the nozzle.

FIG. 18 is a cross-sectional view of the ejector plate for rotating the ejector bin and its III jI ill a. Such features are provided from both sides of the die cavity.

Ejector bin 228 is mounted at one end within ejector plate 230 and extends to die face 232 . For this purpose, the bottle 228 has an extension piece 234 attached to the bottle 228 by means of a tube 23'8.
It is installed in alignment with the axial direction. tube 238
As shown in FIG. 19, it has a pair of spiral grooves 240 formed inside. The pin 228 and the extension 234 are welded to the tube 238 and the free end of the extension threadably engages a bushing 242 which is mounted for rotational deflection within a pocket 246 under the pressure of a Belleville spring 266. There is.

The mold plate 268 is provided with a shouldered sleeve 270 having a pair of diametrically opposed bin followers 272 which are arranged in the helical groove 24 as shown in FIG.
Move within 0. Spline 274 on sleeve 270
are provided which engage splines 276 on tubular spring lock 278 when release bin 280 is retracted.

When the die casting machine closes the mold halves, the bin 228 is in the position of FIG. 20a with its end extending beyond the mold line. As the mold unwinds (Figure 20b), the bottle 228 recedes linearly against the spring 266 under a pressure of about 150 Ky. The release pin retracts and spring 282
slides the lock 278 forward and the splines 274 and 276 engage and prevent the mating sleeve 270 from rotating. When mold plate 268 is pulled back toward the position of FIG. 20C, follower pin 272 operates within groove 240 to rotate tube 238 and pin 228, and extension 234 is threaded into bushing 242. When plate 268 reaches the position of FIG. 20c,
The bottle recedes linearly against the spring 266 exerting a load of approximately 200 Ky, leaving the casting at a distance rBJ (approximately 0.
2#l11).

When plate 268 is returned to its closed position (FIG. 20a), tube 238 rotates back to the position of FIG. 18 and release pin 280 disengages splines 274,276.

Rotation of the bottle surface relative to the casting prevents the bottle from sticking to the casting due to the pressure of the casting process.

Second, as shown in FIG. 20, the casting process retracts the bottle a precise distance depending on the predetermined design specifications of the helix 240 on the tube 238. The bins 228 are thus loosened and retracted, leaving the cast part completely free while remaining contained within the small gap between the bins extending from the mold halves.

A device is provided for initially withdrawing the core bottle prior to opening the mold and immediately after the cast metal has become solidified. This device not only reduces distortion of the core bottle itself, but also provides true stripping action without twisting the casting. This is because the casting has not yet had time to cool and tighten around the core.

The core must have a draft slope of less than 0.005 mm/3 on one side so that there is enough suspension to overcome the shrinkage of the casting during the short interval between solidification and withdrawal times. All you have to do is pull out the core. This has the advantage of reducing scrap, preventing bottle breakage, and preventing distortion in the casting because the core is completely released from the casting when the mold is opened.

Referring to FIG. 21, the ejector plate 284 supports an air cylinder 286 that linearly actuates the rond 288.

Rod 288 is connected at its end to another plate 290 that holds a plurality of core bins (only one of which is shown). Note that each core bin is located within a tubular stripper bin 294. Actuation of air cylinder 286 causes piston rod 288,
Plate 290 and bins 292 within stripper 294 can be advanced or illumination.

As generally shown in FIG. 2, fingers 58 of part transporter 6160 transport casting parts from the mold cavity to secondary operations such as trimming.

When a part is cast from molten metal in a permanent mold, the part must remain in the mold long enough to gain sufficient strength to support its placement after solidification. However, it is of course also desirable to open the mold as quickly as possible from the point of view of shortening cycle times and reducing shrinkage onto the male core. In fact, the casting is Zhou! It comes out at a humidity several hundred degrees higher than the temperature at which it is heated, and if it is cooled by conventional techniques such as water cooling, distortions will occur within the resulting piece, and these distortions will cause the casting to become particularly stiff in thick-walled parts. becomes dimensionally unstable in areas where the area is close to thin-walled portions.

In the system of the present invention, a conveyor is provided which conveys the cast parts from the mold 60 onto the fingers 58 and sequentially separates the parts until they are slowly air cooled to near ambient temperature. Proceed with the process. Slow cooling greatly reduces distortion within the part and allows for secondary machining operations with high precision.

In the illustrated embodiment of the invention, the cast part is mold 60.
from there to the trim work process. 22 here illustrates the "cast" end of the transport mechanism, and FIG. 23 illustrates the "trim" end of the transport mechanism.

Referring to FIGS. 22 and 23, the transport mechanism, indicated generally at 68, has a frame 296 that includes a sprocket 296 at the #1 end of the transport mechanism.
98 and 300, carrying sprockets 302 and 304 at the trim ends. These sprockets are connected to upper track side plates 306, 308, and sprockets 302 and 304 have dedicated side plates 310 for the purpose described below. Other side plates 312 are provided unconnected between sprockets 304 and 298, and these plates 312 act as the return lower run of the transport mechanism.

As clearly shown in FIGS. 25 and 26, a multi-stranded wire cable 314 is provided around the sprocket, the cable 314 having a tensile strength much greater than that required for the task. There is. The cable 314 forms the basis of the conveying system 60 and is provided for this purpose with a plurality of metal fingers 58 loosely attached to the cable 314 for conveying the casting 56 from the mold 68. ing.

As described with reference to FIG. 17, castings or "cast parts" are comprised of castings supported within a frame that includes metal inlets S channels 254 and 260;
It includes a socket 264 that can be machined on the center mold as well as a socket end 258 that is machined on the casting part 262 and spout, overflow stripper pad, etc. and conveyor transfer fingers 58. 25th
As shown in the Figures and FIG. 26, the finger 58 is constructed from an upper body 316 which terminates in a square, diamond-shaped tapered end 318. body 31
8 is attached to cable 314 by set screw 324 117
1112 is provided with a lower socket 320 for accommodating a plug 322 which is freely fixed. plug 32
2 places the body of the finger on the cable with the end retainer 3
26.

As shown in FIG. 25, there is sufficient clearance between the internal socket of the finger and the plug 322 to provide finger movement. Cable 314 is also provided with a plurality of links 328 that are removably attached to the cable via set screws 330. Note that each end of the link 328 is provided with a tapered hole 332, thus providing flexibility in cable movement as the link moves around the sprocket.

If one looks completely at the fingers in the right-hand portion of FIG. 25, it will be seen that the body member 316 includes flat portions that provide shoulders 334 and 336 that engage the lower and upper tracks, respectively.

The function of shoulders 334 and 336 is discussed below.

Sprockets 298 and 300 are rotationally mounted within side plates 338, which connect plate 34.
0 to sight rail 306, plate 338 and sight rail 306 extend coplanarly with each other. In addition, the sight rail 306
As shown in FIG. 6, it supports spaced apart track members 342 which support fingers 58 and in particular shoulders 334 thereof. Note that the track members 342 are spaced apart to accommodate the side surfaces 335 of the fingers 58 as shown on the right side of FIGS. 25 and 26. Furthermore, the sprocket also includes an arcuate member 344, which is connected to the rail 3.
06, the fingers 58 and spacers 328 are continuous together around straight sections and curves, thus reducing the possibility of debris being trapped and stopping the indexing movement. Certain cut-off points and wedge entrances do not exist.

In its return run, the cable 314 runs along the lower run 312 with the fingers 5 as seen from the bottom of FIG.
8, where the upper layer 336 of the finger engages the track member 342.

Looking at the upper left part of FIG. 22, the sprocket 300 has a spaced recess 346 for housing and driving the spacer 328.
and another recess 348 contoured for housing and driving the lower shaped portion of the finger 58.

As shown in FIG. 26, the rail 306 is connected to the die casting machine frame 12 by a plate 350 and a cap screw 352.
installed on.

Referring to FIG. 23, the fingers 5 for conveying the casting parts
8a is indexed along the upper trackway 308 into position on the trim mechanism, generally designated 1354, and after the trimming operation the cable 314 moves the fingers to the sprocket 302.
, and pull it onto orbit 310. The track 310 pivots about the center of the side sprocket 304 (along with the sprocket 302 it carries);
10 (this is actually a long arm) is a spring tension member 35
6 is utilized as a lever around the center of sprocket 304 to maintain the proper tension on cable 314 through the action of 6. Note that the member 356 has one end 358 connected to the arm 310 and the other end 360 connected to the frame 296 of the transport mechanism. Spring 362 is connected to arm 31
0 and the arm 310 is pivotable about the center of the sprocket 304 via a sliding connection between the arm upper portion 364 and the side plates 366 attached to the upper track 308. is being used.

A constant load on the cable 314 serves to maintain a constant overall length of the cable with respect to its elastic elongation properties, and also helps maintain a constant overall length of the cable with respect to its elastic elongation properties.
Small errors in the relative position of the cables relative to each other can be accommodated by intentionally making the fingers loose, as shown for the finger arrangement in FIG. 25, and by adding to or subtracting from this any deviations in the cable fixing position.

As the casting frame remains after the trim operation and the fingers 58a are drawn along the arm 310, they reach the cutter station 368 where the loaded frame is transferred to the carrier fingers 58.
The metal is then kicked off onto a belt conveyor (not shown) and returned to the #R gold-forming metal melting pot.

The kick station, shown in cross-section in FIG.
74 is connected to a plate 376 via a bolt 372 actuated within 74, which plate is connected to a linear actuator 380.

As shown in FIG. 24, the fingers 58 are moved downwardly between the regions of the arcuate end 382 of the slipper 380 along with the rest of the casting frame. Here the slippers are on the casting ears 3
84 (Figure 30).

When the indexing operation causes the fingers 58 and the casting frame to reach the position shown in FIG. 27, the linear actuator 380
is activated to remove plate 376, bolt 372 and slipper 370.
moves outward (to the left in Figure 23 or Figure 27),
The rest of the casting is scraped off and falls onto a conveyor and returned to the melting crucible. The fingers then return to the casting end of the transport mechanism along the lower run of track 312 as shown in FIG.

Next, referring to FIGS. 28 and 29, trim equipment w3
54 occupies a central location between the two platens to support a transfer conveyor track 308 that transports the parts to the trim die and further as required. In fact, as shown in FIG.
8 and the parts it carries.

The trim device consists of two moving platens 386 and 388.
These platens carry a trim die 390 carried on platen 386 and a trim bunch 392 carried by platen 388. These two platens advance toward each other to close around a casting 394 that is stationary and pre-positioned within the carrier frame. The timing of these platen movements is such that while the punch 392 is still advancing, the die 39
0 is taken to reach its final position, so that the die 390 acts as a support for the preliminary advancement of the final positioning member 396 just before the punch impinges on the casting part to cut it off from its carrier frame. are doing.

The trim fitting M354 is of the two fastening bar type, with upper and lower prestressed bars 398 and 4.
00, these bars are the tubular compression member 402
．． 404 to provide substantial rigidity. As shown in FIG. 29, bars 398 and 400 are angled from the vertical to facilitate assembly during overhead lift suspension of the die. A pair of known stroke hydraulic shock absorbers 406, 408 are arranged at 180 degrees opposite each other and on a plane containing the machine centerline to unload the punch 392 as it cuts through the sheared part of the casting. It plays the role of absorbing shock.

One form of trim device is single acting hydraulic cylinders 410 and 41.
2, which drive each of the platens 388 and 386, respectively, along the centerline of the machine axis. Another form of trim device features hydraulic cylinders 414 and 416 that operate as integral parts of a platen shaft that automatically trims the casting part as it is forced through the die for transport. It is possible to provide an opening hole in the die platen for storage in the die platen.

The punch 392 and die 390 have self-aligning characteristics. Referring to FIG. 30, the cast part has a pair of holes 420 and a peripheral flash 422 therein. The casting part is conveyed by fingers 58 into the trim apparatus as shown in FIG. Die 390 is the 32nd
As shown, there is a peripheral collar 424 that surrounds the casting and supports the casting from behind the flash.

Die 390 is attached to platen 386 by a pair of cap screws 426 and spring washers 428. Third
Although only one cap screw is shown in Figure 2,
There is actually a pair of these screws, placed diagonally to each other. The die 390 has a hole 430 for each cap screw 426, the diameter of which is chosen to be slightly larger than the body of the cap screw, and the die 390 has a limited fit on its mounting surface below the spring washer 428. Can be moved.

As shown in FIGS. 31 and 32, punch 392 is similarly mounted to riser 432 by cap screw 434 and spring washer 436, and hole 430 is capped to allow movement of punch 392 on its mounting surface. It is made slightly larger than the diameter of the screw 434. Punch 392 and die 390 can therefore "float" relative to their mounting members and each other.

The punch 392 is provided with a pair of diagonally arranged positioning bins 396, and these bins are connected to the die 39.
0 and into holes 438 in platen 386. Punch 392 also connects a second pair of locating bins 440
, and these bins are located in holes 420 in part 394.
It corresponds to

In operation, conveyor 308 and fingers 58 transport casting part 394 to its position in FIG. 28. Die 390 is advanced to its position in FIG. 32 supporting a cast part, and its position is adjusted to correspond to the shape of the part.

The punch 392 is then advanced toward the die 390 and the part 394 and the hole 420 in the part is aligned with the punch's locating bin 440.
, the punch performs an alignment motion on its cap screw 434. When the punch and die are engaged, the positioning pin 396 is accommodated within the hole 438.

Although the invention has been described in connection with particular embodiments and particular applications thereof, it will be apparent to those skilled in the art that various modifications thereof can be made without departing from the spirit of the invention and the scope of the claims. It would be possible to devise a

The terms and expressions employed herein are words of explanation and not of limitation, and nothing is therefore intended to exclude any equivalence of what is shown and described by these terms in relation to the present invention. Rather, it is to be understood that various modifications are possible within the scope of the invention as claimed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view of a die-casting machine according to the present invention, FIG. 2 is a cross-sectional view of the machine taken along line 2-2 in FIG. 1, and FIG. Figure 4 is a schematic layout of a heat transfer system for cooling the die of a machine according to the invention, viewed along line 3-3 of the figure; Figure 5 is a metal supply crucible and heating arrangement; 6 and 7 are schematic explanatory views of the metal injection part, and 8a
Figure 8b is a cross-sectional view of the metal injection unit, Figure 9 is an enlarged cross-sectional view of the valve valve of the injection unit, and Figure 10 is a cross-sectional view of the metal injection unit.
11 is an elevational and end view of the neck joint; FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 8a; FIGS. 13 and 14. 15 and 16 are diagrams showing a preferred nozzle structure, FIG. 17 is an elevational view of a typical mold cavity, and FIG. 18 is a diagram of a rotary discharge mechanism. 19 is a diagram illustrating a cam and a follower of the rotary discharge mechanism; FIG. 20 is a diagram showing various positions of the rotary discharge mechanism during operation; FIG. 21 is a core pin withdrawal system; Fig. 22 is an elevational view of one end of the casting parts conveyor, Fig. 23 is a cross-sectional view showing the
24 is an elevational view of another end of the transport mechanism, and FIG.
25 is a cross-sectional view of the transport mechanism; FIG. 26 is a cross-sectional view taken along line 26-26 of FIG. 25; FIG. 27 is a cross-sectional view taken along line 24--24 of FIG. is a cross-sectional view of Kitsuka 1111, FIG. 28 is an elevational view showing a partial cross section of the trim device, FIG. 29 is a cross-sectional view taken along line 29-29 in FIG. 28, and FIG. 30 is a cross-sectional view of the trim device. FIG. 31 is a plan view of the punch of the trim device; and FIG. 32 is a cross-sectional view of the punch and die of the trim device. 10: Die casting machine, 12: Frame, 14゜16:
Two pairs of spaced apart parallel cylinder assemblies, 18° 20: Mold (die) half member, 22: Stationary piston, 26: Opposing piston, 24: Piston sear Aft, 28, 30 Niji cylinder, 62. 64: Crown or Skirt end, 32 Nibraten, 34: Die separation and ejection cylinder, 36: Blocking block, 40: Injection assembly, 54: Mold, 56: Casting, 58: Finger, 60: Transfer mechanism representative Asamura J. 6・JG7・J咎-161J0599~ J unit-η・jmari-5~

Claims (1)

[Scope of Claims] (1) A metal injection device for a die-casting machine, which includes a gun neck and a nozzle device for injecting molten metal on a parting line between mold half members of the die-casting machine, and a nozzle device in the die. a first cylinder having a runner for successively discharging a predetermined amount of unsolidified metal from a runner, the shoulder body being a first cylinder having a dosing piston therein and a dosing chamber formed at a lower end of the cylinder; the dosing piston fills the dosing chamber with molten metal from a metal supply in an upward movement and injects molten metal from the dosing chamber into a cavity of the mold in a downward movement, and Thereafter, the input pressure is immediately removed, and the unsolidified metal in the hot water of the mold is discharged from the nozzle device marked #, and is then transferred to the casting formed in the cavity and the selector valve located in the body. a second cylinder incorporated therein, the selector valve having a first cylinder leading from the metal supply to the input chamber of the first cylinder in one position;
opening the passageway while simultaneously closing the first passageway and opening the second passageway at another position, the selector valve being disposed between the input chamber and the second passageway; A metal injection device characterized by: (2. The metal injection apparatus according to claim 1, wherein the selector valve includes a lower head for closing the first passage between the WIFjll metal supply section and the input chamber; an upper head for sealing the second passage between the input chamber and the nozzle device; a stem structure connecting the valve head and having a smaller diameter than the head; and an arm spaced apart from the cylinder that extends radially on the stem structure and slidably engages a wall of the second cylinder. (3) Claims A cantilever frame adapted to be fixed to a frame of a die casting machine and supporting said metal injection unit so as to suspend said unit within a supply crucible of molten metal. the cantilever frame includes a side plate supporting the injection assembly and connected by a cross plate;
a screw on said cross plate acting on said assembly to cause linear movement of said injection assembly between said cantilever frame portion and said injection unit to adjust alignment of said unit nozzle with said machine die; another screw device between the frame and the injection assembly for vertical and horizontal movement, and a three-axis alignment of the nozzle within the gun barrel of the unit and relative to the die of the machine; and a ball and socket joint that is adjustable to allow.