JPH02290661A - Vertical type injection apparatus - Google Patents

Abstract

PURPOSE:To easily separate a product from a biscuit at the time of opening dies by arranging a biscuit ejecting device as insertable between the opened upper die and lower die and pushing off the biscuit developed in casing downward. CONSTITUTION:A small diameter part having the diameter smaller than diameter of inner hole in an injection sleeve 47 is formed at near cavity 8 in molten material passage (composed of a gate 49a and tapered hole 49b) between an insert hole of the injection sleeve 47 in the lower die 25 and the die cavity 8, and a pin 63, freely insertable/pullable into and from the small diameter part, is supported as freely liftable on the upper die 35 side. Further, in the axial center part between the opened upper die 35 and the lower die 25, a pushing device 100 for pushing the biscuit is arranged so as to be insertable and constituted of a cylinder 102, rod 104, piston rod 103 and shifting device 105. By this method, the piston rod 103 is pushed down and the biscuit 101 is pressed, and by pushing off this downward, the biscuit 101 can be easily separated from the casting product and the product drastically improved in the quality is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical injection device that injects a molten material into a mold cavity from directly below. [Prior Art] For example, vertical die-casting machines are often used to cast aluminum automobile disc foils because there is less gas entrainment during injection of molten metal. FIG. 5 is a schematic vertical cross-sectional view of the mold and injection device of this type of conventional die-casting machine. A lower mold 2 having a cylindrical convex portion is attached to the movable platen 3, which is supported by a mold clamping cylinder (not shown) and moves up and down. Two molds 4 are installed. Numeral 5 denotes a plurality of cores inserted into the molds 2.4 from positions dividing the circumferential direction into two equal parts so as to be movable in the horizontal direction, and a piston of a cylinder 6 supported on the movable platen 3 side. It is configured to move horizontally by moving the rod 7 back and forth. A cavity 8 is formed by both the molds 2 and 4 and the closed core 5. An injection sleeve 9 is inserted from below into the sleeve hole formed in the fixed platen 1 and the lower mold 2, and a plunger that is moved forward and backward by an injection cylinder (not shown) is inserted into the injection sleeve 9 from below. The chip IO is fitted so that it can move forward and backward. 11 is the molten metal injected with the injection sleeve 9 pulled out from the sleeve hole. With the above configuration, when the plunger tip 10 is advanced after injecting the molten metal l1 into the injection sleeve and inserting it into the sleeve hole, the molten metal 11 is injected into the cavity 8. After solidifying and cooling, the movable platen 3 is raised to open the mold, and the core 5 is opened laterally, and the product solidified in the cavity is extruded by a product extrusion device (not shown) and released from the machine. Take it out. The melt inside the cavity 8 during such an injection operation
In order to explain the flow, the disk portion 8 of the cavity 8, which corresponds to the disk of the disk foil in FIG.
If a is schematically represented, it has a disk shape as shown in FIG. 6, and the rim portion 8b of the cavity 8 which corresponds to the rim
When expressed schematically, it has a cylindrical shape as shown in FIG. Then, the molten metal 1 pushed up by the plunger chip 10
After l flows radially through the disk portion 8a as shown by the arrow in FIG. 6, it flows radially through the rim portion 8b as shown by the arrow in FIG.
hangs down under its own weight. FIG. 8 is a perspective view showing the state of the molten metal flowing in this manner, and shows that when the molten metal 11 flowing in the above manner hangs down on the rim portion 8b, the temperature unevenness of the mold 2.4 is or uneven adhesion of mold release agent, mold 2
, 4. Scratches on the surface cause irregularities in flowability, and 8th
As shown by reference numeral 12 in the figure, 11 liters of gas may be filled in with 1 liter of molten metal, so if you finish filling as is, molten metal 1
l will entrain gas and create cavities in the molded product. If the cavity 8 is injected with the disc part 8a on the upper side, gas may be drawn in as described in "2." 8a should be on the lower side and the rim part 8b should rise upwards, but in this case, the hub decorative surface of the product will be on the injection sleeve 9 side, and unnecessary molten metal called biscuit will be deposited on this surface. Conventionally, molding has been unavoidably carried out with the disk portion 8a facing upward, since solidified material is attached and cutting it after molding impairs the aesthetic appearance of the decorative surface. [Problems to be Solved by the Invention] As described above, in the past, molding was performed with the disk portion 8a facing upward, so in order to avoid the gas entrainment, injection was performed at a relatively low speed. This not only reduces productivity, but also requires that the flow form of the molten metal 11 in the cavity 8 be controlled by the speed of the plunger tip 10 in order to stabilize the quality of the product. However, for the reasons mentioned above, it could no longer be said to be controllable, and there was a problem in that quality stability could not be measured. However, if the speed of the plunger tip 10 is used to control the injection speed, the injection speed will increase and the entrainment of the gas will increase. In addition, conventional devices were not sufficient to reliably and easily obtain a dense product and to easily separate the biscuits remaining in the injection sleeve from the product after injection. [A Thousand Steps to Solve the Problems] In order to solve these problems, in the present invention, at least the mold cavity of the melt passage between the injection sleeve insertion hole of the lower mold and the mold cavity. A pin is formed in a small diameter part smaller than the inner diameter of the injection sleeve, and a pin is provided so as to be inserted into and removed from the small diameter part of the molten material passage. In order to facilitate removal, a piston rod can be inserted between the open upper mold and lower mold, the upper end of which is in contact with the lower end surface of the upper mold, and the piston rod is provided on the lower end. A biscuit extrusion device is provided in which the tip of the biscuit can be inserted into the small diameter portion of the lower mold. [Operation] When the plunger tip is raised by the injection cylinder, the molten material in the injection sleeve is injected into the mold cavity through the molten material passage. Immediately before or after the end of injection, when the plunger tip is lowered with an upward force applied to it and protrudes downward from the upper movable mold, the protruding tip of this pin is inserted into the small diameter melt passage. When the bottle is lowered, the melt in the melt passage near the vertical axis and in the small diameter part of the cavity is removed by the bottle and forced into other parts of the cavity, so that the feeder action is effective. As a result, the molten metal sufficiently spreads to every corner of the mold cavity, resulting in a dense product. When the molten material solidifies in this state, the solidified material in the molten material passage in the small diameter portion becomes a thin cylindrical shape formed around the pin. Therefore, after solidifying the product,
After the bottle is raised and the mold is opened, the product rises with respect to the upper movable mold, and this thin-walled cylindrical solidified material is reliably and easily cut from the thin-walled cylindrical portion, leaving the biscuit in the injection sleeve. Next, after extruding the product from the opened upper mold and taking it out of the machine, and moving the injection sleeve laterally away from the lower mold and the fixed platen, the biscuit extrusion device is connected to the upper mold. It is inserted between the lower molds and supplies pressure fluid to the chamber on the head side of the cylinder. Then, first, the upper end of the cylinder is brought into contact with the lower end of the upper mold, and then the tip of the piston rod provided at the lower end is inserted into the small diameter molten material passage of the lower mold. The biscuits remaining at the bottom are thrown downward. [Example] This example shows an example in which the present invention is implemented in a mold opening/closing unit of a rotary die-casting machine. Fig. 1 is a vertical cross-sectional view of the mold opening/closing unit in which this is implemented, and Fig. 2 is an enlarged view of the main parts. The longitudinal sectional view, FIGS. 3 and 4 are diagrams explaining the operation of this device. In these figures, the rotary die casting machine is equipped with a rotary table and three sets of mold opening/closing units mounted at positions that divide the outer circumference into three equal parts in the circumferential direction. On the orbit of the rotating mold opening/closing unit, there are three work stations, consisting of a mold clamping station, an injection station, a product ejection station, and a mold cleaning station and a release agent application station, located at positions that divide the circumference into three equal parts. are arranged in each. Each mold opening/closing unit is equipped with a mold, and each of the three stations performs mold clamping and injection, mold opening and product removal, mold cleaning and mold release agent spraying. The table stops every 120° rotation to perform these operations, and one cycle is completed by one rotation. The figure shows the mold opening/closing unit stopped at the mold clamping/injection station, and a mold clamping device and an injection device (not shown) are provided above and below in FIG. In the figure, the mold opening/closing unit 20 is equipped with a mounting plate 2l that is detachably fixed on a rotary table (not shown), and is operated by hydraulic pressure from a pair of mold opening/closing cylinders 22 erected on both left and right sides of the mounting plate 2l. A horizontal plate-shaped top plate 24 is fixedly supported at the working end of the piston rod 23 which moves up and down. As the piston rod 23 advances and retreats, the top plate 24 and the upper mold, which is a movable mold described later, are guided by four wooden guide rods (not shown) and moved up and down, thereby performing mold opening and mold matching. It is structured as follows. A sleeve support plate 26 of a lower mold, which is a fixed mold, is fixed to the mounting plate 21, and the sleeve support plate 26 of the lower mold, which is a fixed mold, and whose upper surface is a part of the mold cavity 8 surface is fixed to the mounting plate 21. A casting channel 49 for pouring molten metal in the vertical direction is formed at the center of the shaft.
an annular mold holder 30 that holds the mold body 32 fixedly with a port 31 in contact with the lower surface and outer circumferential surface of the mold wooden body 32; The mold holder 30 is fixedly attached to the mold holder 30, and the sleeve support plate 26 fixes and holds the lower end of the fixed sleeve 33, which is arranged with its upper end surface in contact with the lower shaft center of the mold wooden body 32. I configured it. The mold holder 30 is constructed by a plurality of guide pins 29 implanted in the sleeve support plate 26 and a push-up cylinder 89 consisting of a cylinder 90 and a piston 91 installed between the sleeve support plate 26 and the mold holder 30. It is made possible to separate it from the sleeve support plate 26 by lifting it by the stroke. However, since there is usually no need to lift the mold holder 30, hydraulic pressure is applied to the rod-side chamber of the push-up cylinder 89, so that the mold holder 30 and the mold wooden body 32 are This prevents it from floating up from the sleeve support plate 26. Therefore, the mold holder 30 can be substantially fixed to the sleeve support plate 26. 28 is a sleeve support plate 26
This is an annular core retaining ring fixed to the top surface with multiple bolts 27. 33 is a fixed sleeve formed in a stepped cylindrical shape, and is connected to the three members 26, 30, and 32 of the lower mold.
The ring 34 is inserted into a sleeve hole formed in the sleeve support plate 26, and is prevented from coming off from the sleeve hole by a ring 34 screwed to the sleeve support plate 26. On the other hand, on the bottom surface of the top frame 24, there is a symbol 35 as a whole.
A substrate 36 of an upper mold, which is a movable mold, is fixed, and the upper mold 35 has an approximately octagonal shape in plan view, which is integrally fixed to this substrate 36 and a plurality of ports 37. A support plate 38, a mold holder 39 fitted and fixed in a recess 38a of the support plate 38, and a recess 39a of the mold holder 39.
It is formed by a mold body 41 that is fitted into the mold body and fixed with a pin 40. At the lower end flange of the support plate 38,
Cylinder support plates 42 are fixed at equal intervals at four locations around the cylinder. 44 is a core cylinder attached to each cylinder support plate 42, and a core 46 is fixed to the working end of the piston rod 45 of each core cylinder 44, respectively. The movement of each core 46 is restricted by the core retaining ring 28 in the state shown in FIG. They are configured to open all at once in the radial direction when the rod 45 retreats. Furthermore, when the four cores are closed as shown in the Zl diagram, a perfect circle is formed by the four inner peripheral surfaces. Then, the cavity 8 shown with the same reference numerals as in FIG. 5 is formed by the matched upper and lower mold bodies 41, 32 and the four closed cores 46. As is clear from comparing the ffil diagram and Figure 5,
In this device, the cavity 8 is upside down compared to the conventional one, and the disk portion 8a is located at the bottom of the overall height of the cavity 8. A cylindrical injection sleeve 47 supported via a block on the upper end surface of an injection cylinder (not shown) is inserted into and removed from the inner hole of the fixed sleeve 33. Branja 4 advances and retreats by
A plunger chip 48a serving as the head of No. 8 is fitted. Both sleeves 33 have the same diameter. Mold wooden body 3 between inner holes 33a, 47a of 47 and cavity 8
A runner 49 is vertically carved in the axial center of the cylinder 2 as a passage for the molten metal injected into the inner hole 33a and injected into the cavity 8 by the advancement of the plunger tip 48a. This runner 49 has an inner hole 33a formed near the cavity 8. It is formed by a gate 49&, which is a cylindrical hole with a considerably smaller diameter than 47a, and a tapered hole 49b, which is formed near the inner hole 33a and widens downward.
The lower end surface of the disk portion 8a following the gate 49a serves as a decorative surface for the product solidified within the cavity 8. In addition, hot water path 49
Since the lower side of the melt passage is made into a tapered hole 49b,
The vertical width of the gate 49a, which is the vertical portion, is formed to be relatively narrow. Outside the upper end of the annular rim portion 8b of the cavity 8, a runner 50 formed in an annular shape that rotates with the rim portion 8b is provided on the lower end surface of the mold holder 39. are connected by a plurality of radially formed gates 51. What is designated as a whole by the reference numeral 52 is a gas venting device for discharging the gas in the cavity 8 to the outside of the machine, and is located between one adjacent core 46 and the two molds 35 and the bottom metal. This degassing device 52 is disposed between the mold 25 and the valve seat 53 and the cylinder 54. The valve seat part 53 is divided into the front side and the back side of the paper in FIG. 1, and is formed to open integrally with each core 46 on both sides. A link 57 is connected to a piston rod 56 of a degassing cylinder 55 which is pivotally connected to the plate 38.
．． 58 so as to be freely movable in the axial direction. This degassing device 52 is a conventionally known cylinder type degassing device, and includes a gas path 59 communicating with the runner 50;
It is equipped with a valve 60 that opens and closes the terminal valve seat part. During injection, the valve 60 opens and gas is discharged by the pressure of the molten metal or by the vacuum device, and the valve 60 closes by the inertia of the molten metal or an electric signal and the molten metal The structure is such that the discharge outside the valve seat is blocked. Further, the cylinder portion 54 functions to ensure valve closing and to hold the valve 60 in each open/close position, and when the upper mold 35 is opened, the cylinder portion 54 is moved away from the valve seat portion 53 by the operation of the cylinder 35 to open/close the valve. and rise together with the upper mold 35. Next, we will explain mold clamping and mold opening. Mold clamping is performed by lowering the top plate 24 from the mold matching state shown in FIG. 1 by a mold clamping cylinder (not shown) against the hydraulic pressure of the mold opening/closing cylinder 22, and the mold opening is performed when the mold clamping cylinder is withdrawn. Later, the mold opening/closing cylinder 22 is changed from the state shown in the figure.
The piston rond 23 moves forward, and the top plate 24, the upper mold 35, and the gas venting device 52
etc. will rise together. When the mold is opened, the product solidified in the cavity 8 reaches the upper mold 35 and rises. Next, a description will be given of a feeder device that operates in the latter half of injection, a cutting device for the gate 49a and a cutting device for the runner 50 when the mold is opened, and a product extrusion device. A cylinder 61 for pin protrusion is fixed to the center of the top plate 24, and a pin rod 62 thereof passes through a rod hole of the top plate 24 and protrudes downward. Reference numeral 63 denotes a round bar-shaped pin which extends downward by having a threaded hole screwed into the protruding threaded part of the piston rod 62. For example, it is divided into three upper and lower stages and then joined together, and the diameter of the lower stage is as follows. The diameter of the gate 49a is slightly smaller than that of the gate 49a. Note that if the inner diameter of the gate 49a is, for example, 40 to 60 mm, the outer diameter of the bottle 63 is the same as that of the gate 49a.
For example, it is formed 1 to 5 mm smaller than the inner diameter of 9a. This pin 63 is connected to a bearing 64 clamped and fixed to the substrate 36 and the support plate 38, the support plate 38, and the mold body 4.
A bearing 65, which is clamped and fixed to the mold body 41, and a cartridge 66, which is fixed to the mold body 4l, are vertically movably supported in shaft holes provided in each of the mold body 41 and the cartridge 66, which is fixed to the mold body 4l. The piston rod 62 is moved forward and backward by the oil pressure of the cylinder 6l, so that the bin 63 moves up and down between the solid line position and the two-dot chain line position in FIG. That is, when the pin 63 descends to the chain line position before the molten metal 67 in the cavity 8 solidifies, the bottle 63 removes the molten metal 67 and acts as a feeder, leaving a thin solidified molten metal 68 at the gate 49a. It is constructed so that the hole is penetrated through it. Then, as will be described later, the product and the biscuit 69 are separated by cutting the solidified molten material 68 when the mold is opened.
Note that a cooling device is provided inside the pin 63 with holes 71 for cooling water extending from the rear to the vicinity of the tip, and the pin 63, which is heated by molten metal, is cooled down to extend its life. At the same time, when the feeder action is finished, the cooling water in the bottle 63 cools the post part in the center of the disk part 8a, which is relatively thick and difficult to cool, and the injection The cycle time of
It is configured to increase workability and productivity.

Furthermore, a plurality of product extrusion cylinders 72 are fixed to the upper surface of the top plate 24, and an ejector plate 74 parallel to the top plate 24 is fixedly supported at the upper end of the piston rod 73. A plurality of pins 75 fixed to the plate 74 pass through holes in the top plate 24 and the substrate 36 and protrude downward, and then a push-out plate is provided in the space of the support plate 38 so as to be movable downward. It is screwed into the 76 screw hole. Top and bottom 2
Each extrusion pin 77 is a plurality of extrusion pins whose heads are held by an extrusion plate 76 that is divided into two pieces and hangs down. 78 has its lower end in contact with a hub extrusion plate 79 which is provided in the space of the mold holder 39 so as to be movable up and down, and the upper end of the rim portion 8b, and the product extrusion cylinder 72 is activated after the mold is opened. When the ejector plate 74 is lowered, the pin 75. Extrusion plate 7
6. The product is pushed out from the cavity 8 downward through the push-out pins 77, 78, the hub push-out plate 79, and the push-out pin 80 that is supported by the hub push-out plate 79 and comes into contact with the disk portion 8a which is also the hub portion. It is configured. The hub push-out plate 79 is guided by the guide pin 81 to move up and down, and is urged by the compression coil spring 82 to return to the raised position.

Furthermore, a plurality of stoppers 83 formed in a 5-cylindrical shape are provided in holes provided at positions dividing the lower end outer circumferential portion of the mold holder 39 into a plurality of equal parts in the circumferential direction, so that the stoppers 83 can freely move forward and backward in the radial direction as shown in FIG. The tapered ends of the rods 85, which are suspended by their own weight from the extrusion plate 76, are held in the tapered holes 83a provided in the respective studs 1 and 83, respectively. When the push-out plate 76 descends by a stroke indicated by the symbol a in FIG. 1, the push-out plate 76 and the rod 85 become one, the rod 85 begins to move down, and the stopper 83 moves outward all at once due to the taper action. It has been done. Also,
The lower end of each extrusion bottle 86, which is supported and suspended at a position that divides the outer circumference of the extrusion plate 76 into a plurality of equal parts in the circumferential direction, is in contact with the runner 50, and the concave hole of the runner 50 is provided with a stopper 83. The provided circular protrusion 83b is removably inserted and seals the solidified molten metal in the runner 50. After the stopper 83 retreats and the protrusion 83b comes out, the extrusion plate 76 further descends and the first The push-out pin 86 is configured to begin to descend when it descends by a stroke indicated by reference numeral 2a in the figure. When the push-out plate 76 begins to descend while the projection 83b of the striker 83 is inserted, the product is first pushed out by the push-out pins 78 and 80 and cut by the gate 51, and an annular ring is placed inside the launcher 50. The solidified material remains retained by the protrusion 83b. After this, the stopper/pa 83 moves with stroke a as described above, and the solids in the runner 50 are pushed out with stroke 2a. 1 is a cylinder for regulating extrusion timing fixed to the upper surface of the top plate 24, and between the piston rond 88 at its upper limit and the ejector plate 74, the rod 85 is stroke a
The same gap a is provided, and the ejector plate 7
When the piston rod 4 descends and comes into contact with the piston rod 88, the descent is temporarily stopped by the control of a solenoid valve and the like, and then it descends again. That is, this stop position is the position where the rod 85 starts lowering and the product is pushed out by a distance a, and by doing this, the lower runner 50 of the product does not turn around and be pushed out. This eliminates the need to remove the lunch, which is difficult, and avoids damage to the product during removal. Between the upper mold 35 and the lower mold 25 where the mold was opened, and. ! The core part was provided with an extrusion device 100 for extruding biscuits for pushing out the biscuits 101 remaining under the lower mold 25 and in the gate 49a after the mold was opened. This extrusion equipment 100 for extruding biscuits is
As shown in FIG. 4, the cylinder 102 and the cylinder 10
A rod 104 provided on the upper side of 2, a piston rod 103 facing downward, and a moving device that moves the cylinder 102 between the upper and lower mold bodies 41.32 that are opening the mold and the lateral outside. 105, the upper end side of the cylinder 102 is brought into contact with the lower end surface of the bottle 63 retracted into the upper mold body 41, and the tip of the piston rod 103 provided on the lower end side is lowered. side mold body 32
Biscuit, 1
・By pushing down on the top surface of 101, the biscuits fall downward. Note that the cylinder 102 needs to be moved slightly in the vertical direction, but this can be done by providing the cylinder 102 so that it can be moved easily relative to the arm of the moving device 105, or by moving the moving device 105 itself slightly in the vertical direction. You can leave it moist. Next, the operation of the device configured as above will be explained.
The mold opening/closing unit 21, which has been sprayed with molding agent and matched at the upstream work station, is rotated by the rotation of the rotary table to the mold clamping/injection station and stopped, so that the top plate 24 is moved downward by the mold clamping cylinder. Mold clamping is performed by pressing. At the same time as mold clamping, the injection sleeve 47 into which the molten metal 69 was injected is fixed to the sleeve 3.
When the plunger tip 48 is moved forward, the molten metal 69 is injected into the cavity 8 and filled. In Figure 2, the solid line indicates the state where injection has completed. Immediately before or after the end of this injection, that is, before the molten metal 69 begins to solidify, when the piston rod 62 of the cylinder 61 for ejecting the bottle is hydraulically advanced, the pin 63 is lowered and ejected from the cartridge 66, as shown in FIG. As shown by the two-dot chain line, the molten metal 69 in the gate 49a is pushed into the molten metal 69, and at this time, the protrusion path of the pin 63 at the vertical axis center in the cavity 8 and the molten metal 69 in the gate 49a are removed by the pin 63. Since it flows into the cavity 8, the molten metal 69 acts as a riser and spreads to every corner of the cavity 8. In this state, the molten metal 69
However, since cooling water is flowing through the hole 7l inside the pin 63, the molten metal 69 around the pin 63, which is the thickest and most difficult to solidify part, solidifies relatively quickly. The mold can be opened much faster.

After a predetermined period of time, the product solidifies and becomes a product. After retracting the pin 63, the rotary table rotates 120" and the mold opening/closing unit 2l stops at the product take-out station. Then, the piston rod 23 moves forward with the hydraulic pressure of the mold opening/closing cylinder 22, and the top plate 24 rises. Therefore, the entire upper mold 35 integrated with this rises to open the mold.In this case, as described above, the gate 4
Since the pin 63 was inserted into the gate 9a and the difference in diameter from the gate 49a was small, a thin cylindrical solidified molten metal was formed around the part where the pin 63 was located. , a tapered hole 49 is located just below the gate 49a.
b is provided, the vertical width of the thin cylindrical portion of the solidified molten metal formed between the pin 63 and the gate 49a is extremely narrow, and the solidified molten metal in the tapered hole 49b has a small diameter at the top. When the mold is opened, the product 100 in the cavity that reaches the upper mold 35 and rises leaves a lot of biscuit inside the fixed sleeve 33 and the taper hole 49b. It is easily cut from the thin cylindrical part and rises together with the upper mold 35. After the mold is opened in this manner, when the piston rod 73 is moved backward by the hydraulic pressure of the product extrusion cylinder 72, the top plate 24 begins to descend. As a result, first the extrusion plate 76
The extrusion bins 77 and 78 integrated with the extrusion bins 77 and 78 descend, and the product l00 whose tips come into contact with each other begins to be extruded from the cavity 8. At this time, as shown in FIG. 2, the projection 83b of the stopper 83
is engaged with the concave hole of the runner 50, so that even if the product 100 is pushed out and lowered, the launch 50 remains as it is and the product l
OO and runner 50 are separated from gate 51. When the top plate 24 descends by the stroke a, it comes into contact with the upper end of the piston rod 88 of the cylinder 87, so the descending stops once, and after a predetermined timing, begins to descend again. When this downward movement is restarted, the pushing plate 76 and the rod 85 are integrated with each other due to the stroke a, so that the rod 85 also falls. As the rod 85 descends, its lower end pushes the tapered hole 83a of the stopper 83, and the taper action moves the stopper 83 outward, so that the protrusion 83
b comes out of the concave hole of the runner 50. Top plate 24
continues to descend and further descends by stroke a, totaling 2
a When the push-out plate 76 and the push-out pin 80 are lowered, the push-out pin 86 also begins to move down, and the annular runner 50 with which its lower end is in contact is pushed out. Figure 3 shows this situation. At this time, the upper part of the injection sleeve 47 has already been lowered and separated from the fixed sleeve 33, and then moved laterally to the hot water supply position. The biscuit 101 remains under the mold wooden body 32, which is a part of the lower mold 25, and in the taber hole 49b of the gate 49a. Next, as shown in FIG. 4, when the extrusion device 100 is moved between the two opened molds and pressure fluid is supplied to the head side chamber of the cylinder 102, the cylinder 102 rises a little and the rod 104 The upper end surface abuts the lower end surface of the pin 63,
Meanwhile, the piston rod 103 moves downward. As a result, the biscuit 104 is pushed down by the action of the piston rod 103 and falls down. 10 liters of this biscuit is received at the bottom and taken out of the machine. When the extrusion of the biscuit 101 is finished, pressure fluid is supplied to the rod side chamber of the cylinder 102, and the cylinder 102 and the piston rod l" l O 3
is returned to its original position, and then the moving device 105 is activated to move the entire extrusion device 100 for extruding biscuits out of the machine. In the case of the product 100 taken out from the mold in this way, in the case of a disc foil, the lower side of the hub in the figure becomes the decorative surface, but since it only has a thin cylindrical solidified material attached thereto, This is easy to remove, and the aesthetic appearance is not compromised even after removal. Although this embodiment shows an example in which the invention is applied to a rotary die-casting machine, it goes without saying that the invention can also be applied to a stationary die-casting machine. It can also be applied to injection molding machines for plastics. [Effects of the Invention] As is clear from the above description, according to the present invention, in the vertical injection device, at least the mold cavity of the molten metal passage between the injection sleeve insertion hole of the lower mold and the mold cavity The gap is formed in a small diameter part smaller than the inner hole diameter of the injection sleeve, and a bottle that can be inserted into and removed from the small diameter part of the molten material passage is supported on the upper mold side so as to be able to move up and down. Even if a part with a smaller diameter than the injection sleeve is provided in the material passage, only a thin solidified material is formed there due to the action of the bottle, and the product and biscuit can be easily separated when the mold is opened. , it is possible to mold a disc foil with a lower hub part without spoiling the aesthetic appearance of the decorative surface, so there is no gas entrainment and the quality of the product is greatly improved. There is no need to reduce the speed, improving productivity. Furthermore, as the pin eliminates the molten metal in the pin protrusion path and small diameter part at the vertical axis of the cavity, this creates a feeder action and the molten metal spreads to every corner of the cavity, containing gas inside. It is possible to obtain a product with a high degree of precision, which improves the quality of the product. It can also be inserted between the opened upper mold and lower mold, with the upper end in contact with the lower end surface of the upper mold, and the tip of the piston rod provided on the lower end inserted into the lower mold. Since a biscuit extrusion device is provided that can be inserted into the small diameter part, any biscuits remaining under the lower mold or inside the gate can be easily dropped and removed.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention,
Figure 1 is a longitudinal cross-sectional view, Figure 2 is an enlarged view of a portion of Figure 1, and Figure 3 is a longitudinal cross-sectional view.
4 and 4 are longitudinal cross-sectional views for explaining the operating state,
5 to 8 illustrate an example of a conventional device similar to the present invention, in which FIG. 5 is a schematic vertical sectional view of a mold and injection device, FIG. 6 is a schematic diagram of a disk portion, Fig. 7 is a schematic diagram of the rim portion, and Fig. 8 is an explanatory diagram showing the flow state of the molten metal.
8...Cavity hole 25...Lower mold, 35...Upper mold, 47...Injection sleeve, 9...Run runner , 49a・
...Gate, l...Cylinder for bottle ejection, 2
... Piston rod, 3 ... Bin, 0 ... Extrusion device for extruding biscuits, ■ ...
...Biscuit, 102...Cylinder 3...
...Piston rod, 4...Rod, 105...Movement device.

Claims (1)

[Scope of Claims] At least the part of the molten material passage between the injection sleeve insertion hole of the lower mold and the mold cavity is formed into a small diameter part smaller than the inner hole diameter of the injection sleeve, A pin that can be inserted and removed from the small diameter part of the material passage is supported on the upper mold side so that it can be raised and lowered, and it can be inserted between the opened upper mold and lower mold, and the upper end is inserted into the upper mold. A vertical injection device comprising a biscuit extrusion device which is brought into contact with the lower end surface of the mold so that the tip of a piston rod provided on the lower end side can be inserted into the small diameter portion of the lower mold.