JPH032365Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention revolves around a plurality of mold opening/closing units holding molds on a rotary table, and a plurality of work stations arranged on the orbiting trajectory. This invention relates to a product extrusion device for a rotary die casting machine that performs casting operations in the order of steps.

[Conventional technology]

Die-casting machines are classified into vertical clamping types and horizontal clamping types depending on the mold clamping direction, and vertical casting machines and horizontal casting machines depending on the direction in which the molten metal is poured into the mold. The basic configuration is the same. For example, a vertical clamping type die casting machine is equipped with a cylinder platen connected vertically with four tie bars, a base platen, and a moving platen that moves up and down along the diver. A mold and a movable mold are mounted facing each other. Then, the moving platen is lowered using the mold clamping cylinder installed on the cylinder platen side, and the molten metal is injected into the cavity of the clamped mold using the injection device below the base platen. One casting cycle is completed by opening and removing the product. Then, before the start of the next casting cycle, the mold is cleaned, a mold release agent is sprayed, and inserts are inserted as necessary.

However, in the conventional die casting machines as described above, it takes a long time for one casting cycle including mold preparation, etc., and in particular, it takes a long time for one casting cycle including mold preparation, etc. This process requires more than 70% of the total time, resulting in a lot of wasted waiting time and poor productivity.

[Problem that the invention attempts to solve]

Therefore, the applicant has developed a rotary die casting machine with the aim of significantly improving productivity. This is done by holding mold opening/closing units that hold molds at positions that divide the outer circumferential part of the rotary table into multiple parts in the circumferential direction, and by rotating this rotary table, multiple mold opening/closing units are placed on the rotation trajectory. Each work is performed in the order of steps while stopping at each work station.

However, in such a rotary die-casting machine, if the working time at any one work station is prolonged, there will be waiting time at other stations, which will reduce productivity. It is necessary to shorten the required time as much as possible and operate reliably. In particular, the process of removing the cast product from the mold requires opening the mold in the mold opening/closing unit that revolves from the previous stage station, ejecting the product from the mold, receiving it, and ejecting it outside the machine. However, it was difficult to shorten the time and ensure reliable operation, which was an obstacle to the commercialization of rotary die-casting machines.

[Means for solving problems]

In order to solve these problems, in the present invention, an elevating plate that can be raised and lowered with a regulated upper limit is placed on the upper surface of the movable platen of the mold opening/closing unit, and a portion of the elevating plate and the movable plate are each formed into a cylinder. A fluid pressure cylinder used as a ram is used to bias and support it in the upward direction.
The product ejection pin fixed to the elevating plate is inserted into the pin hole of the movable plate and the movable mold, and at the work station side, the product ejecting pin is inserted into the movable mold via the elevating plate by operating at the mold open position of the movable plate. A hydraulic cylinder was provided that protruded into the cavity of the mold.

[Operation] With this configuration, when the movable platen of the mold opening/closing unit stopped at the product take-out station rises to open the mold, the fluid pressure cylinder on the station side operates to move the lift plate to the movable platen side fluid. The extrusion pin is lowered against the fluid pressure of the pressure cylinder and protrudes into the cavity of the movable mold to extrude the product from the mold. After extrusion, when the piston rod of the station-side fluid pressure cylinder rises, the elevating plate moves back up together with the product ejection pin due to the fluid pressure of the movable platen-side fluid pressure cylinder.

〔Example〕

1 to 5 show an embodiment of a product extrusion device of a rotary die-casting machine according to the present invention,
Fig. 1 is a partially cutaway front view of the second station, Fig. 2 is a partially cutaway front view of the mold opening/closing unit, Fig. 3 is a plan view of the same, Fig. 4 is a plan view of the rotary table, and Fig. 5 is a partially cutaway front view of the second station. FIG. 1 is a schematic plan view of the entire rotary die casting machine. In the figure, the rotary die-casting machine is equipped with a first station ₂ , _a second station ₃ , and a third station 4, each of which has an angle of 120° with respect to its center line, which is indicated by symbols L 1 , L 2 , and L 3 in FIG. 5. , among which the first station 2 is,
It has a base platen 5 fixed on a floor foundation, and upright tie bars 6 are inserted into tie bar holes provided at three locations forming an isosceles triangle and fixed with nuts 7. . 8 is isosceles 3
The cylinder platen is formed into a rectangular shape, and the upper end of each tie bar 6 is inserted into the tie bar hole thereof, and is firmly fixed with a nut 9 and a split nut 10. On the top surface of the base platen 5,
Hollow shaft 1 for table rotation formed in the shape of an inverted funnel
1 includes a tie bar 6 and is fixed upright concentrically therewith, and a rotary table, designated as a whole by reference numeral 12, is rotatably supported on this hollow shaft 11 via upper and lower ball bearings 13, 14. ing. This rotary table 12 includes a central frame 15 that is shaped like a regular triangular box in plan view and is fitted with ball bearings 13 and 14, and three sets of opening/closing molds disposed at positions corresponding to each side of the triangle. The main parts are composed of unit holding parts 16A, 16B, 16C and fan-shaped support plates 17A, 17B, 17C supported between adjacent mold opening/closing unit holding parts. 18 is a gear that meshes with a pinion (not shown) that is directly connected to the motor on the base platen 5 side, and is fixed to the rotary table 12, and the rotary table 12 is rotated at a predetermined timing by the rotation of the motor according to a command from the control device. It is configured to rotate intermittently in 1/3 rotation increments.

Each mold opening/closing unit holding section 16A, 16B,
16C has exactly the same configuration, so the mold opening/closing unit holding section 16B, which is one of them, and the mold opening/closing unit 25 held in each holding section will be explained. From both ends of the vertical plane of the center frame 15, upper and lower horizontal members 19a,
A pair of arms 19 formed with an I-shaped cross section by a vertical member 19b and a vertical member 19c, and reinforced with ribs 19d.
is bolted to a rectangular support plate 19e at the base to protrude. Reference numeral 20 denotes a pair of push-up cylinders provided on each of the left and right arms 19, one on the front and one on the front. The cylinders 20 are supported by the lower horizontal member 19b and fixed with bolts 21, and are raised and lowered by pressure oil introduced into the port 20a. It is equipped with a ram 20b. The push-up cylinder 20 is configured to hydraulically press and support a mold opening/closing unit 25, which will be described later, against the upper horizontal member 19a of the arm 19 as the ram 20b rises. In addition, the center frame 15
A stopper 23 is inserted from the cylindrical body 22 fixed above.
is located in the middle part of both frames 19 and is fixed to and protrudes from the cylindrical body 22 and the center frame 15,
It is configured to restrict movement of the mold opening/closing unit 25. 24 is a water supply chamber for mold cooling, and is fixed on the cylindrical body 22.

The mold opening/closing unit, which is designated as a whole by reference numeral 25, is equipped with a mounting base 26 as a fixed plate formed in a rectangular plate shape, and in the center of the mounting base 26, an injection sleeve and a piston rod 67c of an ejection cylinder 67, which will be described later, are mounted. In addition to being provided with a through hole 26a into which the mounting base 26 can be inserted, square tube-shaped brackets 27 are vertically erected at the four corners of the mounting base 26 by bolting a board 28. A guide rod 30 is supported in the center of each bracket 27 via a bush 29 so as to be able to rise and fall freely, and a shaft hole of a top frame 42 as a movable platen, which will be described later, is fitted into the upwardly protruding portion of the guide rod 30. It is configured to be fixed and move up and down together with the guide rod 30. The bracket 27 of the mold opening/closing unit 25 framed in this manner is connected on both sides with upper and lower guide plates 31 and stays 32, and a liner 33 is connected to each stay 32 on both sides via a spacer 34. Bolted. The mold opening/closing unit 25, which is inserted between the arms 19 on both sides until it comes into contact with the stopper 23 as described above, has ram holes 35 provided in its liner 33 corresponding to each of the rams 20b, When the liner 25b is raised, the mold opening/closing unit 25 is raised by fitting into the ram hole 35, but at this time, the liner 33 comes into contact with the horizontal member 19b of the arm 19, restricting the rise, and is pressed by hydraulic pressure, and the mold opening/closing unit 25 is raised. The opening/closing unit 25 is mounted on its mounting base 26.
The base platen 5 is configured to be spaced apart from the base platen 5. Then, when the mold opening/closing unit 25 is pushed down by the mold clamping force described later against the hydraulic pressure of the push-up cylinder 20, the front and rear sides of the lower surface of the mounting base 26 of the mold opening/closing unit 25 are brought into contact with the mold abutting surface 5a of the base platen 5.
sit on top of the A pair of left and right brackets 27
A mold opening/closing cylinder 36 is erected vertically between them, and a cylinder fitting 38 screwed into the working end thread of the piston rod 37 is pivoted to fittings 39 fixed to both end faces of the top frame 42. The top frame 42 is configured to move up and down while the guide rod 30 is guided by the pusher 29 by moving the piston rod 37 forward and backward using hydraulic pressure. A fixed mold 40 having a cavity and a movable mold 41 are detachably attached to the mounting base 26 and the top frame 42 using bolts, etc., and by raising and lowering the top frame 42, the mold can be opened and molded. The structure is such that the required minimum mold clamping force is maintained during mold matching. Top frame 42
A pair of rams 43, which form part of the top frame 42, are bolted onto the upper surface of the bottom plate 42b of the circular recessed hole 42a.
A guide extrusion plate shaft 44 is installed in the center of the ram 43 and shaft 44.
On the upper side of the ejector plate 45, a cylinder portion 45a and a boss portion 45 are integrated with the ejector plate 45.
b and are slidably fitted to each other. The extrusion plate shaft 44 passes through the boss portion 45b and connects to the boss portion 45.
It protrudes slightly above b. 46 is the bottom plate 42
The ejector plate 45 is fixed to b with bolts.
This is an extruded metal plate that guides the lifting and lowering of the lift and regulates the upper limit of the lift. Pressure oil is introduced into the cylinder portion 45a of the hydraulic cylinder formed by the cylinder portion 45a and the ram 43, and pushes the ejector plate 45 up to its upper limit.

The mold opening/closing unit 25 configured as described above
The mold opening/closing unit holding parts 16A, 16B, 16C are operated by a mold setup device indicated by reference numeral 47 in FIG.
It is supplied to and taken from. That is, the mold setup device 47 includes a large number of rollers 49 arranged in parallel on both sides of the frame 48 and rotated by the drive of a motor.
are mold opening/closing unit holding parts 16A, 16B, 16
It extends to the bottom of C. And roller 49
After placing the mold opening/closing unit 25 on top and lowering the ram 20b of the push-up cylinder 20, the rollers 4
When the mold opening/closing unit 9 is rotated in the forward direction, the mold opening/closing unit 25 enters between the arms 19 and comes into contact with the stopper 23, whereby the limit switch on the mold setup device 47 side is activated and stopped, so that the ram 20b cannot be raised. As a result, the mold opening/closing unit 25 is positioned, floated above the base platen 5, and fixed. The mold opening/closing unit 25 held by the mold opening/closing unit holding parts 16A, 16B, and 16C is mounted on the rotary table 12.
The mold spray device 50 and the insert insertion device 51 are provided here, and the mold opening/closing unit 25 moves the piston rod of the mold opening/closing cylinder 36 and stops there. After advancing and opening the mold, spraying and insert insertion are performed. The mold spray device 50 is equipped with a spray head 53 that moves forward and backward with a hydraulic cylinder 52, and the hydraulic cylinder 52 moves the spray head 53 between the two molds 40, 41 to blow out air, thereby spraying the molds 40, 41. The mold release agent is applied to the molds 40 and 41 by cleaning and blowing out air and mold release agent. The insert insertion device 51 is a conventionally known device, and after spraying, inserts are inserted into the cavities of the molds 40 and 41 by operating a hydraulic cylinder 54 as necessary. The molds are matched by retracting the molds 40 and 41, and the minimum necessary mold clamping force is applied to the molds 40 and 41.

Further, the first station 2 is provided with a pullback cylinder 56 integrated with a mold clamping cylinder 55, an injection device (not shown), and an automatic hot water supply device 57. Then, when the mold opening/closing unit 25 moves to the first station 2 in the mold matching state and stops, the main ram of the mold clamping cylinder 55 is lowered by hydraulic pressure to lower the top frame 42, so that both molds 40 and 41 are A large mold clamping force is applied, and this mold clamping force is supported by the base platen 5. During mold clamping, the molten metal in the melting furnace 58 is injected into the injection sleeve of the injection cylinder (not shown) by a conventionally well-known automatic water supply device 57, and after the mold clamping, this molten metal enters the cavities of the molds 40, 41. It is ejected. After injection, the mold clamping force is released by the pullback cylinder 56. After injection, the molten metal is solidified and cooled, and during this cooling, the rotary table 12 rotates 120 degrees, and the mold opening/closing unit 25, which is in the middle of cooling, moves to the second station 3 and stops.

Therefore, the structure of the frame of the second station 3 and each device will be explained. The second station 3 is the first
An extruded frame 60 having an isosceles triangular shape in a plan view is bolted to the end face of the cylinder platen 8 of the station 2 and installed horizontally.
A protruding cylinder frame 61 is formed into a Y-shape in plan view by an arm 61c branching in two directions from a boss portion 61b at the tip thereof, and protrudes through a bracket 62. A presser claw device 62 and an extrusion frame 6 are attached to the tip of the arm 61c.
Both ends of the isosceles triangle base of 0 are connected by tie bars 63, respectively. The presser cylinder 62 is equipped with a claw 65 that moves horizontally forward and backward using a hydraulic cylinder 64 to engage and disengage the tip of the arm 19 of the rotary table 12, and holds the stopped rotary table 12 at a predetermined timing. It is configured to be fixed in place. Note that the arm 61c is supported by a bracket 66 on a foundation on the floor. 67 is the boss portion 6 of the protruding cylinder frame 61
1b, and is equipped with a piston rod 67c that is raised and lowered by selectively supplying oil to ports 67a and 67b, and this piston rod 67c is raised and lowered by hydraulic pressure to the mounting base of the mold opening/closing unit 25. It is configured such that it can protrude into the mold cavity from an injection sleeve 40a provided in the fixed mold 40 of the hole 26a provided in the hole 26a. At the same time as the piston rod 67c rises, the top frame 42 of the mold opening/closing unit 25
When the mold opening/closing cylinder 36 holds the movable mold 41 and rises, so-called mold opening is performed, the product whose biscuit portion is projected by the piston rod 67c is held in the cavity of the movable mold 41 and rises. The extrusion frame 6 in this raised position
A piston rod 69 of an extrusion cylinder 68 fixed to the upper surface of the extrusion frame 60 is inserted into a cylinder mounting hole 60a formed opposite to the lower boss portion 61b.
A half-cylindrical coupling ring 70 is fixedly fixed to 9 by splitting. The lower end surface of the coupling ring 70 faces the boss portion 45b, which is a part of the ejector plate 45 of the mold opening/closing unit 25.
When the piston rod 69 is lowered by hydraulic pressure, the ejector plate 45 is lowered against the hydraulic pressure of a hydraulic cylinder consisting of a cylinder portion 45a and a ram 43. The ejector plate 45 has a plurality of (12 in this embodiment) pins 4.
5c is a pin hole 42 provided in the top frame 42.
A push-out plate 71 is fixed to the lower end of the pin 45c so as to protrude downward through the pin 45c. There is. Further, a plurality of extrusion pins 72 are protruded from the lower surface of this extrusion plate 71, and these extrusion pins 72 are connected to the movable mold 41.
The pin hole 41a is inserted into the pin hole 41a and extends into the cavity. With this configuration, when the piston rod 69 of the extrusion cylinder 68 descends in the state where the mold is opened as described above, the boss portion 45b is pushed by the coupling ring 70, the ejector plate 45 descends, and the extrusion plate An extrusion pin 72 moves the product inside the cavity into the movable mold 4 through the
Push downward from 1. After extrusion, the ejector plate 45 is raised and returned to its original position by the hydraulic pressure of a hydraulic cylinder consisting of a cylinder portion 45a and a ram 43.

Furthermore, a movable mold 41 is provided at the second station 3.
A product take-out device 73 is provided for receiving the product extruded from the machine and discharging it onto the floor or the like. This product take-out device 73 includes a horseshoe-shaped tray 75 that is driven by a hydraulic cylinder 74 to advance and retreat between the illustrated position and the center position of the molds 40 and 41, and a puller that is driven by a hydraulic cylinder 76 to advance and retreat in a direction perpendicular to the tray 75. 77, and when the receiving tray 75, which has received the product extruded from the mold 41 at the forward position, moves back to the illustrated position, the puller 77, which was waiting at the forward limit beyond the receiving tray 75, moves back and receives the product. is configured to be pulled out onto the basket 78. A link mechanism (not shown) is attached to the basket 78, and when the link mechanism is moved by a driving device, the basket 78 reciprocates between the illustrated position and the cold water tank while holding the product, thereby cooling the product. The cooled product is configured to slide on the chute and be discharged onto the floor or the like.
Note that the product take-out device 73 is connected to the mold setup device 4.
7 is in use, the entire unit moves and evacuates.

The casting operation of the rotary die casting machine constructed as described above will be explained in the order of steps for one set of mold opening/closing units 25. After the entire product take-out device 73 is evacuated from the mold setup device 47, the mold opening/closing unit 25 in the mold matching state is moved to the mold setup device 4.
The mold opening/closing unit 25 is moved forward by placing the mold opening/closing unit 25 on the rollers 49 of No. 7 and preparing the mold opening/closing unit 25 by starting the motor to rotate the rollers 49. At this time, rotary table 1
2 are mold opening/closing unit holding parts 16A, 16B, 16
C is stopped with the center located on the center line _L2 , and the ram 20b of the push-up cylinder 20 is lowered, so the mold opening/closing unit 25 that has moved forward is able to move onto the roller 49 without interfering with the arm 19 side. enters the space between the arms 19, contacts the stopper 23, and is stopped by the action of the limit switch on the mold setup device 47 side. When it stops, pressure oil is introduced into the port 20a of the push-up cylinder 20, and the ram 20b rises and engages with the ram hole 35, and then rises further, so that the liner 33 is aligned horizontally with the arm 19, as shown in FIG. It stops in a state where it is pressed against the member 19a by hydraulic pressure. As a result, as shown in FIG. 2, the lower end mounting base 26 of the mold opening/closing unit 25 is spaced apart from the contact surface 5a of the base platen 5 and floats up by about 20 mm, for example. Then, when the piston rod 37 of the mold opening/closing cylinder 36 is raised, the top frame 4
2 rises, and the molds 40 and 41 become open.
After opening the mold, the rotary table 12 rotates 120 degrees, and the mold opening/closing unit 25 that has opened the mold stops at the third station 4. Therefore, the spray head 53 of the mold spray device 50 is advanced to the center of the molds 40, 41, and air and mold release agent are spouted to spray the molds 40, 41.
Apply a mold release agent to 1. After the spray head 53 is removed, the piston rod 37 of the mold opening/closing cylinder 36 is moved back and the top frame 42 is lowered to align the molds 40 and 41. In this case, the molds 40 and 41 are The minimum necessary mold clamping force is applied.

When the mold matching is completed, the rotary table 12 rotates 120 degrees, and the mold opening/closing unit 25 that has been matched stops at the first station 2. Therefore, the mold clamping cylinder 5
When pressure oil is introduced into 5, the top frame 42
By being pushed down against the hydraulic pressure of the mold opening/closing cylinder 36 and the hydraulic pressure of the push-up cylinder 20, and further pushing down the entire mold opening/closing unit 25, a strong mold clamping force acts on the molds 40, 41, and at this time, The mounting base 26 is seated on the contact surface of the base platen 5, and the strong base platen 5 can sufficiently withstand the large mold clamping force. During mold clamping, molten metal is injected into the injection sleeve of the injection cylinder by the automatic hot water supply device 57, and the injection sleeve that has been poured is inserted into the sleeve 40a of the fixed mold 40 through the hole 26a of the mounting base 26, and the mold is heated. Molten metal is injected into the cavities of molds 40 and 41. When this molten metal solidifies, the pressure oil in the mold clamping cylinder 55 is removed and the pressure oil is introduced into the pullback cylinder 56, thereby releasing the large mold clamping force, and the top frame 42 and the mold opening/closing unit 2
5 is slightly raised to maintain a small mold clamping force during cooling.

During the cooling of the molds 40 and 41, the rotary table 12
When the molds 40 and 41 are rotated by 120 degrees, the mold opening/closing unit 25 holding the molds 40 and 41 which are being cooled moves to the second station 3 and stops. When the molds 40 and 41 have finished cooling, the piston rod 3 of the mold opening/closing cylinder 36
7 advances and the top frame 42 rises, and at the same time the piston rod 67c of the protruding cylinder 67 advances, the solidified and cooled product is transferred to the hole 26.
a and a piston rod 67c protruding from the sleeve 40a, the piston rod 67c protrudes from the fixed mold 40, and is held in the cavity of the movable mold 41, which rises together with the top frame 42, and rises. When the top frame 42 finishes rising, the product take-out device 7
Pressure oil is introduced into the extrusion cylinder 68 at the same time that the third receiving tray 75 advances between the molds 40 and 41. As a result, the piston rod 69 descends, and the coupling 70 fixed thereto descends, pushing down the boss portion 45b of the ejector plate 45.
The ejector plate 45 resists the hydraulic pressure of the hydraulic cylinder from the cylinder portion 45a and the ram 43, and the shaft 44
and is guided by the ram 43 of the cylinder portion 45a to descend. Therefore, the extrusion plate 71 connected to the ejector plate 45 by the pin 45c is lowered, and the extrusion pin 72 integrated with the extrusion plate 71 extrudes the product in the movable mold 41 and causes it to fall onto the receiving tray 75. Immediately after the product is extruded, the pressure oil in the extrusion cylinder 68 is released, so the coupling ring 70 is separated from the boss portion 45b, and the ejector frame 45 is moved away from the cylinder portion 4.
5a and the ram 43, the extrusion plate 71 and the like are raised, and the extrusion pin 72 is retracted into the pin hole 41a of the movable mold 41. When the tray 75 that has received the product moves back, the puller 77 that has been waiting pulls out the product onto the basket 78, and the product is cooled by reciprocating between it and the cold water tank while being held in the basket 78 using a link mechanism. Afterwards, it slides on the chute and is discharged and accumulated on the floor. As described above, the mold then moves to the third station 4 in the open state.

The casting operation has been explained in the order of steps for one set of mold opening/closing units 25, but the rotary table 1
Each time the other mold opening/closing unit holders 18B, 18C of No. 2 stop at the second station 3, the mold opening/closing unit 25 is supplied thereto and
By performing the same operations as above in steps 3 and 4, a normal casting cycle begins. In addition, during normal casting work, when it is desired to take out a pair of molds 40 and 41 for maintenance etc., when the mold opening/closing unit 25 with the target mold attached is located at the second station 3. It is sufficient to take this out onto the mold setup device 47 and supply a replacement mold opening/closing unit 25 after rotation of the rotary table 12. During this time, normal casting work is continued for the other two sets of mold opening/closing units. Therefore, production of molds other than the ones to be replaced will not be reduced. Furthermore, when all three sets of mold opening/closing units 25 are replaced due to a change in product specifications, the mold opening/closing units 25 must be taken out three times at the second station 3 and the mold opening/closing units 25 must be taken out three times each time the rotary table 12 rotates 120 degrees. If the mold opening/closing unit 25 is installed and the work at the other stations 2, 4 is continued during this time, production will not be significantly reduced due to mold replacement.

In addition, as a means for raising and returning the ejector plate 45 etc. after extruding the product from the mold 41,
Although it is possible to use the elastic force of a compression coil spring instead of the hydraulic pressure of the cylinder part 45a, sliding resistance of the pin 45c etc. is required to push back the heavy ejector plate 45, extrusion plate 71, etc. Not only does this require a large force and a spring with an extremely large spring constant, but the extrusion cylinder 68 that acts against this spring force also requires a large output and is therefore large in size. So I don't like it. In addition, a return pin slightly longer than the ejector pin 72 is provided outside the cavity in parallel with the ejector pin 72, and its tip is brought into contact with the mold matching surface of the fixed mold 40 during mold matching, so that the ejector plate 45, etc. Although it is possible to return to an upward position,
In this case, solidified molten metal burrs may enter between the extrusion pin 72 and the pin hole 41a, and the return pin alone may not have enough force to return, and the return pin may not be able to return into the cavity until the molds are matched. Since it remains protruded, the core, insert, etc. often do not enter the predetermined position within the cavity, which is also undesirable.

Although this embodiment shows an example in which three work stations are provided, the number may be two, or four or more.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the product extrusion device of a rotary die-casting machine, a lifting plate that can be raised and lowered with a regulated upper limit is installed on the upper surface side of the movable platen of the mold opening/closing unit. A part of the platen is urged and supported in the upward direction by a fluid pressure cylinder used as a cylinder and a ram, respectively, and a product ejection pin fixed to the elevating plate is inserted into the pin hole of the movable platen and the movable mold. A hydraulic cylinder is installed on the work station side to operate when the movable platen is at the mold open position and to project the product ejection pin into the cavity of the movable mold via the elevating plate. When the mold is opened, the hydraulic cylinder immediately operates to extrude the product from the mold cavity. After extrusion, the fluid in the hydraulic cylinder is drained and another hydraulic cylinder that is part of the lifting plate and movable platen is released. The entire extrusion member quickly and reliably returns to its pre-extrusion state using fluid pressure.
The product extrusion time is shortened, the work time of other stations can be balanced, and the product extrusion operation is ensured. Further, the structure is simplified by requiring only one separate hydraulic cylinder.
This will promote the practical application of rotary die-casting machines and greatly improve productivity.

[Brief explanation of the drawing]

1 to 5 show an embodiment of a product extrusion device of a rotary die-casting machine according to the present invention,
Fig. 1 is a partially cutaway front view of the second station, Fig. 2 is a partially cutaway front view of the mold opening/closing unit, Fig. 3 is a plan view of the same, Fig. 4 is a plan view of the rotary table, and Fig. 5 is a partially cutaway front view of the second station. FIG. 1 is a schematic plan view of the entire rotary die casting machine. 1... Rotary die casting machine, 2... First
Station, 3...Second station, 4...
Third station, 12...Rotary table, 16
A, 16B, 16C...Mold opening/closing unit holding part,
25...Mold opening/closing unit, 26...Mounting stand, 36
...Mold opening/closing cylinder, 40...Fixed mold, 41...
...Movable mold, 41a...Pin hole, 42...Top frame, 43...Ram, 44...Extrusion plate shaft, 4
5...Ejector plate, 45a...Cylinder part, 45b...Boss part, 45c...Pin, 46...
...Extruded plate fitting, 68... Extruded cylinder, 70...
Coupling ring, 71... extrusion plate, 72... extrusion pin.

Claims (1)

[Scope of utility model registration request] The mold is opened and closed using a fixed plate that holds a fixed mold and is supported on the rotary table side, and a movable plate that holds a movable mold and moves up and down using fluid pressure to move it toward and away from the fixed mold. A rotary table which constitutes a mold opening/closing unit and which is attached to each of the mold opening/closing units at circumferentially divided positions on the outer periphery is intermittently rotated, and different processes are simultaneously performed on the mold opening/closing units at each work station at the stop position. In a product extrusion device for a rotary die casting machine, the product extrusion device of a rotary die-casting machine is configured to have an elevating plate that is supported on the upper surface of the movable platen so as to be able to rise and fall freely with a limited rise limit, and a part of the elevating plate is used as a cylinder to raise and lower the movable platen. a fluid pressure cylinder that uses a part as a ram to urge the lift plate in the upward direction; a fluid pressure cylinder that is fixed to the work station side and presses down the lift plate at the mold open position of the movable platen; and a fluid pressure cylinder that is fixed to the lift plate side. A product extrusion device for a rotary die casting machine, characterized in that a product extrusion pin is provided which is inserted into the movable platen and the pin hole of the movable mold, and moves into and out of the cavity of the movable mold by raising and lowering the elevating plate.