JPH035258B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a die-casting method and an apparatus thereof.

[Conventional technology]

Die-casting machines are classified into vertical-clamping type and horizontal-clamping type depending on the mold clamping direction, and also into vertical-clamping type and horizontal-clamping type depending on the method of pouring molten metal into the mold.

FIG. 25 is a longitudinal sectional view of a conventional vertical clamping vertical casting die casting machine similar to that described in Japanese Patent Publication No. 58-29182, and is based on this figure. To explain, the cylinder platen 1 and the base platen 2 are vertically connected by four tie bars 3, and the tie bars 3 have a main ram 4 and a pullback cylinder 5.
Moving platen 6 that moves up and down by the operation of
A fixed mold 7 and a movable mold 8 are mounted on both platens 2 and 6 facing each other. The one designated as a whole by the reference numeral 9 is an injection cylinder that is tiltably supported by a pin 12 on the platen 11 at the lower end of a tie bar 10 hanging from the base platen 2 side. 14, a plunger 16 connected to the piston rod 14 by a coupling 15, a block 18 supported above the cylinder 13 so as to be freely raised and lowered, and a ram that is erected on the upper surface of the cylinder 13 and raises and lowers the block 18 using hydraulic pressure. 19, and an injection sleeve 20 which is attached to the upper end of the block 18 and fits into the head of the plunger 16.
1a, it is configured to tilt between the position shown by the solid line and the position shown by the chain line in the figure. This die-casting machine is equipped with a hot water supply device, a product take-out device, a spray device, etc. (not shown).

The casting operation by the die casting machine configured as above will be explained. The moving platen 6 equipped with the movable mold 8 is lowered by the operation of the main ram 4, and the movable mold is pressed against the fixed mold 7 to perform mold clamping. Next, the injection cylinder 9 is tilted to the chain line position in the figure by the operation of the tilting cylinder 21, and after the molten metal is injected into the injection sleeve 20 by the water heater, the injection cylinder 9 is raised to the solid line position, and the ram 19 moves the block 18 and move the injection sleeve 20 to the fixed sleeve part 2 on the mold 7 side.
2. Then, by operating the injection cylinder 9 and raising the plunger 16 within the injection sleeve 20, the molten metal is injected into the cavities of the molds 7 and 8. After injection, the molten metal waits for it to solidify and cool down, then the pullback cylinder 5 raises the moving platen 6 to open the mold, and then the solidified product is taken out of the machine by the product take-out device. Then, preparation for the next casting is completed by cleaning the cavities of the molds 7 and 8 with a spray device and applying a mold release agent, and one casting cycle is completed.

[Problem that the invention seeks to solve]

However, in the conventional die-casting method and device for the die-casting machine configured as described above, one casting cycle takes a long time, and there is a problem in productivity. That is, FIG. 26a is an explanatory diagram showing the required time for each step of the casting cycle of the conventional die-casting machine, and as is clear from the figure,
After injection, it takes about 45 seconds to solidify and cool the product, and after taking out the product, it takes about 40 seconds to cool the mold, clean it, and spray, so the entire cycle takes about 114 seconds. It was necessary.
As described above, more than 70% of the total time was required for processes other than the direct casting process such as mold clamping, injection, and mold opening, and there was a lot of wasted waiting time, resulting in poor productivity.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, as a die-casting method, a rotary table section equipped with a plurality of mold opening/closing units that can be opened and closed to hold a mold is equipped with the same number of work stations as the mold opening/closing units. The product in the mold in the main mold clamping/injection device in one of the work stations is in the middle of cooling, and the mold in the other work station has completed preparation for mold clamping. Sometimes, the main mold clamping of the mold that is in the middle of cooling is released and only temporary mold clamping is performed by the mold opening/closing unit, and the time when the rotary table is rotated one pitch is set so that the molten material injected after the final mold clamping is This includes the time when the product is almost solidified in the mold and begins to develop rigidity, and the time when the product is completely removed.

In addition, the die-casting equipment includes multiple mold opening/closing units that can be opened and closed and are equipped with a mold matching device that supports both fixed and movable molds and temporarily clamps these two molds, and each of these mold opening/closing units can be attached and detached. A rotary table that rotates intermittently along the top surface of the machine base fixing plate is provided with holding parts at multiple equal positions in the circumferential direction, and the mold opening/closing unit held on this rotary table is arranged on the orbital trajectory. and a main mold clamping mechanism which is arranged in the process order on these work stations and seats the mold mounting base on the machine fixing plate and lowers the top frame further than the temporary mold clamping state. The mold opening/closing unit is interposed between the main mold clamping/injection device and the product ejecting device, and the upper surface of the rotary table and the mold opening/closing unit held thereon, and the mold opening/closing unit is connected to the machine fixing plate when the main mold is not clamped. A push-up cylinder was provided to keep it floating.

[Effect]

With this configuration, a plurality of mold opening/closing units mounted on a rotary table are respectively positioned at a station equipped with a mold clamping and injection device, etc., to perform each operation, If the rotary table is rotated by one station while the mold opening/closing unit is cooling the product in the mold, during this rotation, the mold opening/closing unit in the other station may be sprayed with molds, mold surfaces such as mold cleaning, etc. Since the preparation for mold clamping and product ejection by is performed continuously.

In this type of casting operation, the mold in the mold opening/closing unit is temporarily clamped by the closing of the mold opening/closing unit, and then moved by the rotation of the rotary table, and the mold mount is fixed to the machine base by this mold clamping device. The mold is clamped for the final time while seated on the board, and after injection, the product moves during cooling and transitions from regular mold clamping to temporary mold clamping, which significantly reduces the energy required for mold clamping.

〔Example〕

1 to 24 show an embodiment of a die-casting apparatus according to the present invention shown for explaining the die-casting method according to the present invention, and FIG. 1 is a plan view thereof;
Fig. 2 is a sectional view along AA in Fig. 1, Fig. 3 is a plan view of the first station, Fig. 4 is a BB sectional view in Fig. 3, Fig. 5 is a side view from C in Fig. 3, and Fig. 6 is a sectional view of the first station. The figure is a plan view of the rotary table, FIG. 7 is a DD sectional view of FIG. 6, FIG. 8 is a front view from E in FIG. 6, and FIG.
10 is a vertical sectional view of the mold opening/closing unit, FIG. 11 is a plan view, FIG. 12 is a side view from G in FIG. 10, and FIG. 13 is a front view of the second station. , Figure 14 is also a side view, the first
Fig. 5 is a front view of the product removal device, Fig. 16 is a side view, Fig. 17 is a plan view, Fig. 18 is a front view showing one set of upper and lower parts of the automatic coupler attachment/detachment device, and Fig. 19 is a side view of the same. Side view showing the set, No. 20
The figure is an enlarged plan view from H in Fig. 13, and Fig. 21 is an enlarged plan view of Fig. 2.
Figure 22 is a sectional view of KK in Figure 20, Figures 23 a to d are explanatory diagrams of the operation of the automatic coupler attachment/detachment device, and Figure 24 is a longitudinal sectional view of the mold clamping safety valve. be.

First, the first station, generally indicated by the reference numeral 30, will be described. On the floor foundation 32 in front and behind the pit 31 under the floor surface and on the pair of front and rear bases 33 fixed in the pit 31, there is a table support part 34a having a circular shape in plan view, and a table support part 34a having an isosceles triangular shape in plan view. injection part 34b, and mold contact surface parts 3 located before and after the injection part 34b, that is, before and after the rotary table 51 (described later).
A base platen 34 integrally formed with 4f is fixed with anchor bolts 35 and 36, and a space 34c into which an injection device 101, which will be described later, is inserted is formed in the injection portion 34b. The lower ends of the upright tie bars 37, 38 are fitted into the tie bar holes 34d, 34e provided at the center of the table support part 34a and at both ends of the triangular bottom side of the injection part 34b, with the lower ends of the tie bars 37, 38 being restricted from descending by the flanges. A tie bar nut 39 is screwed into the lower protruding screw portion to firmly fix the tie bars 37, 38. 4
0 is a rotation stopper that restricts the loosening of the turber nut 39. A split nut 41 is screwed into the threaded portion provided at the same height on the upper part of each tie bar 37, 38 and fixed by split tightening, and the cylinder platen 42 formed in an isosceles triangular shape is The lowering is restricted by a nut 41, and tie bars 37 and 38 are fitted into tie bar holes 42a at the apex of the triangle. A tie bar nut 44 with a rotation stopper 43, which is the same as the one at the lower end, is screwed into the upwardly protruding screw portions of the tie bars 37, 38 to firmly fix the cylinder platen 42 to the split nut 41. The support part of the first station has been explained above, but the mold clamping device will be explained after the rotary table, mold opening/closing unit, etc., which will be explained below.

Table support portion 34 of the base platen 34
On the upper surface of a, a hollow shaft 50 for rotating the table formed in the shape of an inverted funnel is fixed upright and concentrically with the tie bar 37 inside, and is designated by the reference numeral 5 as a whole.
A rotary table indicated by 1 is rotatably supported by this hollow shaft 50 via upper and lower ball bearings 52, 53. This rotary table 51 includes a central frame 54 that is shaped like an equilateral triangular box in plan view and is fitted with ball bearings 52 and 53, and three sets of mold opening/closing unit holders arranged at positions corresponding to each side of the triangle. 55A, 55B, 55C (described later),
The main part is composed of fan-shaped support plates 56A, 56B, and 56C supported between adjacent mold opening/closing unit holding parts. 57 is the base platen 34
It is a pinion that is directly connected to the motor 58 on the side and meshes with a gear 59 fixed on the rotary table 51 side, and the motor 58 is driven based on commands from the control device.
The rotation table 51 is configured to rotate intermittently by 1/3 rotation at predetermined timings. Tie bars 37, 3 are fixed to the outer periphery of the table support portion 34a of the base platen 34.
A cylinder 61a is attached to the bracket 60, which is protruded at a position on the perpendicular bisector of the isosceles triangle connecting 8.
A positioning cylinder 61 consisting of a ram 61b and a ram 61b that can move forward and backward in the vertical direction is supported vertically.
A hydraulic cylinder 62 for advancing and retracting the ram 61b is attached to its lower end. On the other hand, on the center frame 54 of the rotary table 51, three positioning plates 63 each having a concave hole that engages with the head of the ram 61b as the ram 61b moves forward are arranged on the lower surface of the center frame 54 at each point of the triangle. , and each time the rotary table 51 rotates 1/3 and stops, the ram 61
b is raised and sequentially engaged with each positioning plate 63, thereby being positioned and fixed at the stop position.

Each mold opening/closing unit holding part 55A, 55B,
Since the mold opening/closing unit 55C has exactly the same structure, the mold opening/closing unit holding section 55B, which is one of them, and the mold opening/closing unit 70 held in each holding section will be explained. From both ends of the vertical plane of the central frame 54, upper and lower horizontal members 64a,
A pair of arms 64 formed with an I-shaped cross section by a vertical member 64b and a vertical member 64c and reinforced with ribs 64d.
is bolted to a rectangular support plate 64e at the base to protrude. Reference numeral 65 denotes a pair of push-up cylinders provided on each of the left and right arms 64, supported by a lower horizontal member 64b and fixed with bolts 66, and raised and lowered by pressure oil introduced into the boat 65a. It is equipped with a ram 65b. The push-up cylinder 65 is configured to hydraulically press and support a mold opening/closing unit 70, which will be described later, against the upper horizontal member 64a of the arm 64 by raising the ram 65b. In addition, the center frame 54
A stopper 68 is inserted from the cylindrical body 67 fixed above.
is located at the intermediate portion of both arms 64, fixed to the cylindrical body 67 and the center frame 54, and protrudes, and is configured to restrict movement of the mold opening/closing unit 70. Reference numeral 69 denotes a water supply chamber for mold cooling, which is fixed on the cylindrical body 67.

The mold opening/closing unit 70, generally designated by the reference numeral 70, is
A rectangular plate-shaped mounting base 71 is provided on the lower surface, and a through hole 71a is provided in the center of the mounting base 71 into which an injection sleeve and a piston rod 149c of the protruding cylinder 149, which will be described later, can be inserted. A bracket 72 formed into a rectangular tube shape is erected vertically at the corner by bolting a board 73. A guide rod 75 is attached to the center of each bracket 72 via a bush 74.
are supported in such a way that they can be raised and lowered, and a shaft hole of a top frame 76, which will be described later, is fitted and fixed in the upwardly projecting portion of the top frame 76, so that the top frame 75 can be raised and lowered together with the guide rod 75. The bracket 72 of the mold opening/closing unit 70 framed in this way is
Both sides are connected by upper and lower guide plates 77 and stays 78, respectively, and a liner 79 is bolted to each stay 78 on both sides via a spacer 80. The mold opening/closing unit 70, which is inserted between the arms 64 on both sides until it comes into contact with the stopper 68 as described above, has ram holes 81 provided in its liner 79 corresponding to each of the rams 65b, When 65b is raised, it engages with the ram hole 81 and opens the mold opening/closing unit 7.
0 rises, but at this time the liner 79 is connected to the arm 6.
The rise is regulated by contacting the horizontal member 64a of No. 4,
The mold opening/closing unit 70 is configured to separate its mounting base 71 from the base platen 34 while being pressed by hydraulic pressure. Then, when the mold opening/closing unit 70 is pushed down by a mold clamping force, which will be described later, against the hydraulic pressure of the push-up cylinder 65, the front and rear sides of the lower surface of the mounting base 71 of the mold opening/closing unit 70 become the upper surface of the mold contacting surface 34f of the base platen 34. sit down. A mold opening/closing cylinder 82 is vertically installed between each pair of left and right brackets 72 , and a cylinder fitting 84 screwed into the working end thread of the piston rod 83 is fixed to both end surfaces of the top frame 76 . By moving the piston rod 83 forward and backward using hydraulic pressure, the top frame 76 is configured to move up and down while guiding the guide rod 75 with the bush 74. Then, the mounting base 71 and the top frame 7
6, a fixed mold 86 having a cavity and a movable mold 87 are removably attached with bolts or the like, and mold opening and temporary mold clamping, that is, mold matching, are performed by raising and lowering the top frame 76. The structure is such that the minimum necessary mold clamping force is maintained during mold matching. top frame 76
A pair of rams 88 are bolted onto the upper surface of the bottom plate 76b of the recessed hole 76a, and an extrusion plate shaft 89 for guiding is installed in the center of the bottom plate 76b. These two rams 88 and shaft 89 are mounted on the upper side of the ejector plate 90, and are attached to a cylinder portion 90a that is integrated with the ejector plate 90.
and the boss portion 90b, respectively, in a slidable manner. The push-out plate shaft 89 passes through the boss portion 90b and projects slightly upward from the guide portion 90b. Reference numeral 91 denotes an extruded metal plate that is fixed to the bottom plate 76b with bolts to guide the ejector plate 90 as it moves up and down and to regulate the upper limit of its rise. Pressure oil is introduced into the cylinder 90a, and the ejector plate 9
0 to its upper limit. The product extrusion device including the ejector plate 90 and the like will be described later. Safety hooks 92 and 93 are engaged with the bracket 72 below the guide rod 75 to restrict the descent of the top frame 76 and the movable mold 87 when the top frame 76 has risen to its upper limit and the mold is opened. A rod 94 for operation, a link mechanism 95, etc. are connected to this.

Next, the mold clamping device and injection device provided in the first station 30 will be explained based on FIGS. 2 to 5. As shown in FIG.
The mold opening/closing unit 70 held at the top frame 76 clamps both molds 86 and 87 with a predetermined low pressure by lowering the top frame 76, and is lifted up from the base platen 34 by the hydraulic pressure of the push-up cylinder 65. In this state, when the rotary table 51 rotates and the mold opening/closing unit 70 is located in the first station 30 as shown in FIG. 2, the mold clamping device 100 and the injection device 101 are disposed at the upper and lower positions. ing. Of these, the mold clamping device 100 is equipped with a main ram 103 that is fitted into a ram hole 42b formed in the cylinder platen 42 and moved up and down by pressure oil guided to the port 102. The formed moving platen 104
is fixed by bolting. Reference numeral 105 denotes an annular gland that secures the gasket inserted into the fitting portion of the main ram 103 and the pushers that sandwich it from above and below, and is bolted to the lower surface of the cylinder platen 42. Further, a frame-shaped spacer 106 corresponding to the top frame 16 of the mold opening/closing unit 70 is bolted to the center of the lower surface of the moving platen 104. The cylinder platen 42 is generally designated by the reference numeral 107.
It is a pair of left and right pullback cylinders fixed to the upper surface, and is provided with a stepped cylinder rod 109 vertically penetrating and fitted to the cylinder 108 through a bush and a gasket so as to be vertically movable.
The lower end of the cylinder rod 109 is fixed to both left and right ends of the moving platen 104. Then, by introducing pressure oil into the cylinder 108 and raising the cylinder rod 109, the main ram 1
The moving platen 104, which has been lowered in step 03, is slightly raised to the mold clamp release position. Further, one of the pullback cylinders 107 is provided with a safety valve 110, the details of which are shown in FIG. This safety valve 110 prevents the moving platen 104 from unintentionally lowering, and includes a valve body 111 fixed to the cylinder 108, a flange 112, a cylinder block 113, and a flange 11 bolted to the top and bottom of the valve body 111.
A rod 115 having a stepped portion is supported by the flange 112 and the lower end of the cylinder block 113 via a packing 116 etc. so as to be vertically movable. Compression coil spring 117 loaded in
is urged upward by. The lower end surface of the rod 115 is provided with a flat portion 115a at the outer periphery and a small diameter protrusion 115b at the center. Further, in the inner hole of the sleeve 118 fitted into the inner hole of the valve body 111, there is provided a sleeve 118 on the same axis as the rod 115 and facing the lower surface of the rod 115.
19 is fitted in a vertically movable manner, and another sleeve 120 is fitted into the inner hole of this sleeve 119.
are fitted so that they can move up and down. 121 is a compression coil spring interposed between the sleeve 120 and the flange 114 to support the sleeve 120 under static load; when the rod 115 is lowered, the small diameter protrusion 115b of the rod 115 is initially
compressed by the sleeve 12 pushed down at the tip of the
It is configured so that it is later compressed by a sleeve 119 that is pushed down by the flat surface 115a of the rod 115. Normally, sleeves 119, 120
Both are restricted from their upper limit positions without coming into contact with the rod 115. 122a, 122b,
123 are annular grooves that connect communication passages 124,
125, and the outer annular groove 122a communicates with the oil chamber above the main ram 103. Furthermore, the sleeve 119,1
The oil passage 126 that has been closed by the rise of the oil passage 20 is connected to the oil tank via an oil passage that is joined to a flange 127 . On the other hand, a striker 128 is fixed to one cylinder rod 109 of the pullback cylinder 107, and when the striker 128 pushes down the cylinder rod 115 when the main ram 103 is lowered, the striker 128 pushes down the cylinder rod 109 when the main ram 103 is lowered. At first, the sleeve 120 opens between the annular groove 123 and the oil passage 126 due to the action of the small protrusion 115b, and later the flat part 11
5a, the sleeve 119 opens between the annular groove 122b and the oil passage 126, and the oil above the main ram 103 is drained by a small amount and a large amount, and the safety valve 1
10 to the oil tank in two stages to stop the lowering of the moving platen 104 by the main ram 103. In an emergency, oil is drained in two stages because if a large amount of oil is removed at once, it is difficult to drain the oil smoothly due to noise and vibration. In the mold clamping device 100 configured in this manner, the mold opening/closing unit 70, which is rotated by the rotary table 51 and stopped directly below the mold clamping device 100, clamps the molds 86 and 87 at a predetermined low pressure. Then press the base platen 3 with the push-up cylinder 65.
4, the main ram 103 is lowered to the point where it is floating, and the mold 86,
87 with a predetermined strong mold clamping force, and
The mold opening/closing unit 70 is moved against the push-up force of the push-up cylinder 65 to the mold contact surface 3 of the base platen 34.
It is configured to be seated and pressed at 4f. Moving platen 10 with bullback cylinder 107
4, the main mold clamping is released and returns to the temporary mold clamping state where only the mold opening/closing cylinder 82 is acting, and the mold opening/closing unit 70 is pushed up by the push-up cylinder 65 and removed from the base platen 34. surface.

Next, since the injection device 101 has substantially the same configuration as the conventional injection device shown in FIG. 25, the same reference numerals are given in FIG. 2 and a brief description will be given below. Tie bar and frame 10 hanging from the base platen 34 side
A plunger 16 is connected by a coupling 15 to a piston rod 14 which is raised and lowered by hydraulic pressure of an injection cylinder 9 supported by a cylinder 9, etc., and this plunger 16 slides onto an injection sleeve 20 supported by a block 18 which is raised and lowered by a ram 19. They are movably fitted. The injection sleeve 20, which is raised together with the block 18 by the ram 19, is inserted into the fixed mold 86.
When the plunger 16 is raised by the injection cylinder 9, the molten metal in the injection sleeve 20 is injected into the cavities of both molds 86 and 87 which are clamped by the mold clamping device 100. Second
Although not shown in the figure, the injection cylinder 9 is equipped with a tilting cylinder 21 shown in FIG. An automatic water heater, generally designated 130, is attached. In this automatic water heater, a frame 131 erected at the end of the base platen 34 has a main body 132 of the device.
The device main body 132 is supported by a joint link 133, and the main body 132 of the device rotates one fulcrum of the four-joint link 133 to the position shown in the figure at a predetermined timing by the action of a rotation cylinder (not shown), as shown by a chain line. It is configured to rotate between the cylinder facing position and the cylinder facing position. Reference numeral 135 denotes a melting furnace installed on the floor, filled with molten metal 136, and the main body 132 of the device has two servo motors 134, etc., which move it forward and backward into the molten metal as shown by the arrows in the figure. A ladle 137 that moves is provided. The ladle 137, which advances and retreats into the molten metal 136 and draws it up, is configured to face the injection sleeve 20 of the tilting cylinder by rotation of the device main body 132, and supply the molten metal 136 into the interior thereof.
The forward/backward movement and rotation of the ladle 137 and the rotation of the device main body 132 are automatically performed at predetermined timings by a control device.

Next, the second station will be explained in detail in the 13th and 14th sections. 2nd station 1
Reference numeral 40 includes an extruded frame 142 having an isosceles triangular shape in plan view, which is fixed to the end surface of the cylinder platen 42 of the first station 30 on the rotation center side of the rotary table 51 with bolts 141 and installed horizontally. The line connecting the center of the base and the apex of the equilateral triangle and the center line of the mold clamping station 30 are the first
As shown by the symbols L and _L1 in the figure, they are arranged at an angle of 120° from each other. On the other hand, the base platen 3
On the end surface of the rotary table 51 of No. 4 on the rotation center side, there is an arm 143a and a boss portion 143b at the tip of the arm 143a.
A protruding cylinder frame 143, which is formed into a Y-shape in plan view with arms 143c and 143cd branching toward each other, protrudes through a bracket 144, and presser claws attached to the tips of the arms 143c and 143d. The device 145 and both ends of the isosceles triangular base of the extrusion frame 142 are connected by tie bars 146, respectively. The holding pawl device 145 includes a pawl that moves horizontally using a hydraulic cylinder 147 to engage and disengage the tip of the arm 64 of the rotary table 51, and holds the stopped rotary table 51 at a predetermined timing. It is configured to be fixed in place. In addition, arms 143c, 14
3d is supported on the floor foundation by brackets 148. The second station 140 having a framework formed in this way includes the first station 3
At 0, the mold opening/closing unit 70 that holds the molds 86 and 87 that have finished casting is held on the rotary table 51 and rotates while the product is being cooled. This is the structure in which the mold opening/closing unit 70 is explained earlier (see Figs. 10 and 11).
The above is explained including. 149 is a protruding cylinder supported by the boss portion 143b of the protruding cylinder frame 143, and is equipped with a piston rod 149c that moves up and down by selectively supplying oil to the ports 149a and 149b.
49c is raised by hydraulic pressure so as to be able to protrude into the mold cavity through a center hole provided in the mounting base 71 of the mold opening/closing unit 70 and the fixed mold 86. Then, at the same time as the piston rod 149c rises, the top frame 76 of the mold opening/closing unit 70 moves up while holding the movable mold 87 by the mold opening/closing cylinder 82, so-called mold opening is performed, so that the biscuit part is ejected by the piston rod 149c. The product is held in the cavity of the movable mold 87 and raised. A piston rod 151 of an extrusion cylinder 150 fixed to the upper surface of the extrusion frame 142 is inserted into a cylinder attachment hole 142a formed in the extrusion frame 142 in this raised position, facing the lower boss portion 143b. A half-cylindrical coupling 152 is fixed to the piston rod 151 by splitting. The lower end surface of this coupling 152 faces a boss portion 90b provided on the ejector frame 90 of the mold opening/closing unit 70, and when the piston rod 151 is lowered by hydraulic pressure, the ejector frame 90 is moved against the hydraulic pressure of the cylinder 90a. configured to descend. The ejector frame 90 has a plurality of pins 90c (12 in the embodiment).
It is fixed so as to protrude downward through a pin hole 76c provided in the top frame 76, and the pin 9
An extrusion plate 96 is provided at the lower end of the top frame 7.
It is parallel to the lower surface of the movable mold 87 and is fixed in the recessed part of the movable mold 87. Furthermore, a plurality of extrusion pins 97 are protruded from the lower surface of this extrusion plate 96.
This extrusion pin 97 is inserted into a pin hole 87a provided in the movable mold 87 and extends to the inner surface of the cavity. With this configuration, the extrusion cylinder 150 can be opened in the opened state as described above.
When the piston rod 151 of the
0b is pushed by the coupling ring 152, the ejector frame 90 is lowered, and the extrusion pin 97 extrudes the product in the cavity downward from the movable mold 87 via the extrusion plate 96.

Next, a product take-out device for receiving the product extruded from the movable mold 87 and taking it out of the machine will be described with reference to FIGS. 15 to 17 and FIG. The base 161 of the product retrieval device 160, which is framed in a rectangular shape in plan view, approaches the second station 140 from a location extending approximately along a line connecting the center of the first station 30 and the center of the second station 140. A plurality of frames 163 are mounted on a rail 162 laid on this base 161, and a plurality of frames 163 are pivotally connected to a frame base 163a. The vehicle is provided so as to be freely movable by rolling wheels 164 of the vehicle. Reference numeral 165 is a hydraulic cylinder for moving the frame 163, and the working end of a piston rod 166 is fixed to the frame base 163a, and the striker 169 is in contact with a limit switch 167 for the forward limit and a limit switch 168 for the backward limit. It is configured to run. 17
0 is a guide roller for controlling lateral vibration. In addition,
The frame 163 always moves forward while the device is in use, and retreats to a retracted position when attaching and detaching the mold, which will be described later. Further, on an arm support stand 171 erected in a framework shape at the front end of the frame base 163a,
A box-shaped bearing box 172 is fixed, and a hydraulic cylinder 173 having a long stroke of about 2 m is mounted horizontally on the side plate of the bearing box 172. A bracket 175 having a T-shape in side view is fixed to the working end of the piston rod 174 of this hydraulic cylinder 173.
Air cylinder 17 hanging from horizontal member 75
A horseshoe-shaped saucer 178, which is open to one side, is supported at the upper end, which is the working end, of the piston rod 177 of No. 6 so as to be adjustable up and down by an air cylinder 176. Piston rod 17 to bracket 175
A pair of guide shafts 1 fixed at one end in parallel with 4.
79 is rotatably supported by the bearing of the bearing box 172 and extends parallel to the hydraulic cylinder 173, and its tip end is connected by a connecting plate 180. Further, the bracket 175 and the connecting plate 180 are connected by a pair of stays 181 provided with a striker 181a. With this configuration, when the piston rod 174 of the hydraulic cylinder 173 moves forward from the illustrated position, the receiving tray 178, together with the bracket 175, the guide shaft 179, the connecting plate 180, and the stay 181, moves to the product take-out station 140.
Move forward to the center of the air cylinder 17 at this position.
The piston rod 177 of No. 6 is actuated to
8 is raised to a predetermined position convenient for receiving the product, and after receiving the product ejected from the movable mold 87 as described above, the piston rod 177 is retracted to return to the position shown. Reference numeral 182 denotes a plurality of limit switches that stop or decelerate the movement of the tray 178 at the forward limit, backward limit, and intermediate position, respectively, by contact with the striker 181a.

On the other hand, a water cooling frame 183 formed in an L-shape in side view is erected at a location adjacent to the arm support stand 171 of the frame base 163a, and circulating cold water is stored in the lower half wide part of the water cooling frame 183. Water tank 18
4 is provided. An arm shaft 185 with a full width of the frame is rotatably supported slightly above the center of the water cooling frame 183 in the height direction, and a lever 18 integrally formed in the center of the arm shaft 185 is rotatably supported.
The other end of 6 is pivotally connected to a piston rod of a hydraulic cylinder 187 supported by a water cooling frame 183. Further, at both ends of the arm shaft 185, there is a pair of arms 18, each having a roller 188 pivotally attached to its tip.
9 is fixed, and by hydraulically moving the piston rod of a hydraulic cylinder 187 forward and backward, the arm 189 can be rotated approximately 90 degrees between a horizontal position and a vertical position. 190 is a pair of upper and lower strikers that move up and down together with the piston rod, and 191 is a limit switch that stops the arm 189 at both rotational limits when the striker 190 comes into contact with it. A pair of mutually parallel guide rails 192 is attached to each notch provided on both sides of the water cooling frame 183 in close proximity to the arm shaft 185. roller 19
3 is supported so that it can be raised and lowered freely. The one designated by the reference numeral 194 is a water cooling cage having one end fixed to a shaft supporting a pair of rollers 193 and a central portion supported by a pair of rollers 188, and formed into a U-shape with both side plates and a bottom plate. and the arm 189 described above.
It is configured to move up and down between the illustrated position and the position in the water tank 184 as the roller 193 moves up and down while rotating between a horizontal position and a vertical position. 195 is a water cooling frame 183
A pair of limit switches are fixed to a bracket 196 standing upright above, and 197 is a roller 1
A shaft 198 that stands upright integrally with the non-rotating member on the 93 side.
The striker 1 is a striker that is supported by
97 comes into contact with the limit switch 195, so that the car 194 is stopped at the upper limit and lower limit, respectively.

Furthermore, a frame-shaped puller frame 199 is erected at a location adjacent to the water cooling frame on the frame base 163a, and a bracket 200 extending horizontally in the direction of the car 194 is provided on the top plane of the puller frame 199. It is joined. A hydraulic cylinder 201 is supported by the tip of the bracket 200 and the top plane of the puller frame 199 and extends in a direction perpendicular to the hydraulic cylinder 173, and the piston rod 2 moves forward and backward by the hydraulic pressure.
A vertical plate 203 is fixed to the working end of the piston rod 202, and a pair of stays 2 with one end fixed to the vertical plate 203 surround the piston rod 202.
04 and a guide rod 205 extend parallel to the hydraulic cylinder 201 and are integrally fixed at the other end by a U-shaped connecting plate 206. Further, the guide rod 205 is supported by a bearing provided on the bracket 200 so as to be able to move forward and backward. Furthermore, a puller 207 is provided at the lower end of the vertical plate 203 and has an arcuate inner surface when viewed from above, and is configured to move forward and backward together with the piston rod 202. Then, when the receiving tray 178 is moving forward to receive the product and is not at the position shown in the figure, the puller 207, which has advanced together with the piston rod 202, stops at the position shown by the chain line 207 in FIG. 17 and waits. receives the product and returns to the position shown in the figure. At this time, by retracting the puller 207 with the piston rod 202 by about a half stroke, the product on the tray 178 is placed on the same horizontal plane as the tray 178 or slightly below it, and just in front of you. The car 194 is configured to be drawn into the car 194 located at. Thereafter, by the above-described rotation and lowering operations of the basket 194, the products held by the basket 194 are put into the water tank 184 and cooled therein, and then the basket 194 returns to the position shown in the figure. A chute 208 facing toward the floor is located at a location corresponding to the bracket 200.
is provided, and by retracting the piston rod 202 the remaining half stroke, the car 19
The product after being water-cooled in the container 4 is pulled out by a puller 207, slides on a chute 208, and is then accumulated on a floor surface, a transport platform, or the like. 209 is a plurality of strikers provided on the stay 204, and 210 is a limit switch fixed to the bracket 200 side.
When the piston rod 09 comes into contact with the limit switch 210, the piston rod 202 is stopped at the forward limit, the backward limit, and the product water cooling position of the puller 207, respectively.

Next, the third station will be explained. This third station 220 is connected to other stations 3
It is a station that does not have a frame supported by tie bars such as 0.140, and only rotates and stops the rotary table 51, and the center line of the stop indicated by the chain line _L2 in FIG. 3
0,140 and the stop center lines L and _L1 are respectively 120 degrees. Since the opened molds 86 and 87 are held by the mold opening/closing unit 70 and rotate to the station 220, the insides of the molds 86 and 87 are cleaned by spraying and a release agent is applied. The molds 86 and 87 are matched, and inserts are inserted as necessary. What is indicated by the reference numeral 221 in FIG. 1 is a conventionally well-known mold spraying device.
An arm holder 223 whose center line is directed toward the center of the mold opening/closing unit 70 is fixed on the top, and a piston rod 225 of a hydraulic cylinder 224 is fixed to the arm holder 223 and extends on the center line. , front and rear connecting plates 226, 227
An arm 229 is fixed, which is formed into a framework by a pair of guide rods 228 supported by the arm holder 223 so as to be movable forward and backward. Front connecting plate 22
From 6, water receiver 230 and upper and lower blocks 231
A spray head 232 consisting of a spray head 232 is formed and protrudes so as to be rotatable in the horizontal direction by an internal gear device. A mold release agent pipe and an air pipe are led to the upper and lower blocks 231, and the spray head 232 is advanced to the center of the mold by a hydraulic cylinder 224, and the mold is cleaned by spouting air while rotating. The mold release agent is applied to the mold by mixing the mold release agent and air and blowing the mixture. Number 233 in Figure 1
2 is a conventionally known insert insertion device, in which when it is necessary to insert an insert into a product, a head 235 is moved by a hydraulic cylinder 234.
into the mold and insert the insert into the cavity. The molds 86 and 87 that have been cleaned and coated with a mold release agent in this manner are moved to the movable mold 8.
The molds are matched by lowering the top frame 76 holding the molds 7 with the mold opening/closing cylinder 82. As a result, the minimum necessary mold clamping force is maintained in the molds 86 and 87. Further, as described above, the mold opening/closing unit 70 is pushed up by the push-up cylinder 65 and sent to the first station 30 by the rotation of the rotary table 51 in a floating state from the base platen 34.

Next, the molds 86 and 8 are connected to the mold opening/closing unit 70.
The attachment/detachment device No. 7 will be explained. As shown in FIGS. 1 and 2, below the mold opening/closing unit holder 55A of the rotary table 51 that is stopped at the second station 140, a plurality of legs and a frame member at the upper end thereof are integrated. The formed frame 240 is erected on the floor so as not to interfere with the protruding cylinder 149, etc., and rollers 241 are each supported by a plurality of sets of bearings arranged in parallel on both sides of the upper surface of the frame 240. There is. Furthermore, on the floor following the frame 240, there are a plurality of legs and a frame 240 at the upper end thereof.
A frame 242 integrally formed with a long frame material joined to and extending from the frame material is erected, and rollers 243 are each supported by a plurality of bearings arranged in parallel on both sides of the upper surface of the frame 242. ing. Each roller 24
A chain is stretched between 1,243 and the coaxial sprocket, and one part of the chain is connected to the reducer 14.
The motor 245 and the reducer 244 are drivingly connected by a chain, and the motor 245 and the reducer 244 are drivingly connected by a belt, and by the forward and reverse rotation of the motor 245, all the rollers 241 and 243 are driven. It is configured to rotate forward and backward at any time. To install the molds 86 and 87, the molds 86 and 87 are installed in the mold opening/closing unit 70 in advance and placed on the rollers 243 of the mold setup device 246, while the rotary table 51 The ram 65b of the push-up cylinder 65 is lowered, and the motor 2
45 in the forward direction, the mold opening/closing unit 70 advances due to the rotation of the rollers 241 and 243, and when it reaches the arm 64 of the rotary table 51 and its front end abuts the stopper 68, the limit switch provided below the roller 241 is activated. , the mold opening/closing unit 7 is activated by the action of the striker pushed by the mold opening/closing unit 70.
0 stops at a predetermined position. Then, by raising the ram 65b of the push-up cylinder 65, mounting of the mold is completed. Mold 8 for mold replacement etc.
6, 87 from the rotary table 51, by the above-mentioned reverse operation and reverse rotation of the motor 245,
It can be taken out onto the rollers 243. In the case of mold replacement, the mold opening/closing unit 70 equipped with a new mold is suspended by a hoist, etc., and immediately after the previous mold opening/closing unit 70 is taken out, it is lowered onto the rollers 243 and moved forward. . The relationship with other stations 30, 240 in this case will be described later.

Next, an automatic attachment/detachment device for attaching and detaching hydraulic hoses, mold water cooling piping, electrical wiring, etc. to the mold opening/closing unit 70, which is attached to and detached from the rotary table 51, is installed based on FIGS. 18 to 22. I will explain.
This automatic attachment/detachment device is provided with a female coupler on the rotary table 51 side, and a male coupler that is detachably connected to the female coupler in the mold opening/closing unit 70, and is attached/detachable on the second station 140 side. It is designed to be attached and detached by a mechanism,
What is indicated by chain lines 64 and 64a in FIGS. 18 and 19 is the arm 6 of the rotary table 51 shown in FIG.
4 and its horizontal member 64a. arm 6 on one side
At the base of the horizontal member 64 of No. 4, a horizontal member 250a is attached.
A frame 250, which is formed into a U-shape when viewed from the front and an inverted L-shape from a side view by a pair of vertical members 250b and a substrate 250c, is attached to the frame seat 251.
The left and right horizontal members 64a
The bearing 250d formed at the tip of the adapter mounting plate 255 is integrally formed in an H-shape with a horizontal strip-shaped mounting plate 253 and a pair of rods 254 fixed through shaft holes at both ends thereof. , Rod 25
4 are fitted and supported so that they can be raised and lowered freely. 25
4a is a compression coil spring that is interposed between the rod cap 257 and the bearing 250d and biases the adapter mounting plate 255 in the upward direction; the figure shows a state where this is compressed and the adapter mounting plate 255 is lowered. There is. On the other hand, what is shown by chain lines 72 and 78 in FIGS. 19 and 21 are the bracket 72 and the stay 7 of the mold opening/closing unit 70 shown in FIG.
8, and on this stay 78, a death plate, generally designated by the reference numeral 256, is fixed. This death plate 256 is formed into a U-shape when viewed from the front and a rectangular shape when viewed from above, and bearing portions 256a having bushes 256b are formed on the upper surface of both ends thereof. The left and right rods 254 are connected to the bearing portion 25.
6a so that it can be inserted and removed. Further, between the death plate 256 and the adapter mounting plate 255, a push plate 258, which is made up of a rectangular plate 258a and bearing parts 258b at both ends thereof, is provided to allow the bearing part 258b to slide freely on the rod 254. Rods 259 are fixed with nuts and planted at both ends of the diagonal line of the plate 258a. This rod 259 passes through a rod hole drilled in the mounting plate 253 and projects upward, and there is a space between the upper collar and the mounting plate 253.
Compression coil spring 2 that urges the rod 259 upwards
60 is interposed. Note that unless the rod 259 is pushed from above, the rod 259 and push plate 258
This means that the compression coil spring 260 is supported in a fully expanded state.

On the other hand, what is indicated by the reference numeral 142 in FIGS. 18 and 19 is the extrusion frame shown in FIGS. It is attached above the coupler attachment/detachment mechanism 262.
That is, the extrusion frame 142 has an L shape when viewed from the side.
The frame 263 formed in a letter shape is the mounting seat 26.
4,265, and a hydraulic main cylinder 264 is erected on the support plate 263a at the lower end thereof. A rectangular presser plate 266 is fixed to the lower end of the piston rod 265 of the main cylinder 264, and a pair of guide rods 267 have their lower ends fixed to this plate.
It is slidably fitted into a hole in the support plate 263a and protrudes upward. Further, on the holding plate 266, a pair of rod guides 268 are arranged to guide the rods 25.
A hydraulic auxiliary cylinder 269 is vertically fixed to the upper end surface of each rod guide 268, and a push rod 270 serving as a piston rod is installed inside the rod guide 268. It is configured to be inserted and retracted from its lower opening end. By the operation of the main cylinder 264 and the auxiliary cylinder 269, the rod cap 257 and the rod 25 are
4 and rod 259 are each pushed down separately to attach and detach the coupler as described below.

That is, on the mounting plate 253, there are three types of plug adapters 271, 272, 273, large, medium and small, and a nut 274 and square spring 27 that sandwich the mounting plate 253 from above and below.
It is held at 5. Also, death plate 25
In the recess 6, there are three types of adapters 276, large, medium and small.
277 (small size not shown) is plug adapter 27
It is fixed corresponding to 1,272,273,
Each adapter 276, 277, etc. has a coupler 27
8,279 (the small one is not shown) are screwed and supported, respectively. In FIG. 22, coupler 278,
The configuration of No. 279 is omitted in the illustration, and the configuration of No. 279 is omitted from the illustration.
Since the details of the configuration are shown in the operational explanatory diagram in the figure, the coupler 278 will be described below based on FIG. 23.
Explain the configuration and operation of. The coupler 278 is comprised of a male coupler 280 screwed onto the lower end threaded portion of the plug adapter 271 and a female coupler 281 screwed onto the adapter 276. Among these, the male coupler 280 is formed of a cylindrical coupler body 282 having a valve seat at the lower end, and a valve 283 slidably supported in the inner hole of the coupler body 282 via a bushing. is biased by a valve spring 284 in a direction to close the valve seat. The female coupler 281 is formed of a cylindrical coupler body 285 having a valve seat in the center of the inner hole, and a valve 286 slidably supported in the inner hole via a bushing. 286 is biased by a valve spring 287 in the direction of closing the valve seat. Coupler body 2
Balls 288 are respectively loaded into a plurality of ball holes provided near the upper opening end of the ball 85.
In addition, a cylindrical sleeve 289, which is biased upward by a spring member (not shown), is attached to the upper half of the outer circumferential surface of the coupler body 285 and is slidable by engaging the protrusion with the groove 285a on the outer circumferential surface of the coupler body 285. is mated to. A ball 288 is attached to the upper end of the sleeve 289 and the outer peripheral surface of the male coupler body 282.
Recessed holes 289a and 282a are respectively provided in which the couplers 280 and 282 are engaged, and are configured to engage with the ball 288 when the couplers 280 and 281 are coupled. Therefore, the coupling operation of both couplers 280 and 281 will be explained. In addition, in Fig. 23, the 18th
Frame 250 and rod 2 in Figs.
59 and the plug coupler 271 are omitted, and are shown to be pressed down directly with the male coupler 280 by the holding plate 266 of the main cylinder 264, and are shown to be pressed down directly against the male coupler 280 by the push rod 270 of the auxiliary cylinder 269. Illustrated in. In FIG. 23a, the sleeve 28
9 is rising and pushing the ball 288 inward with a protrusion, and the upper and lower valves 283 and 286 are closed. From this state, as shown in FIG.
When the sleeve 70 descends greatly and pushes the push plate 258, the sleeve 289 descends and its recess 289a faces the ball 288, so that the ball 288 engages into the recess 289a and is inserted into the inner hole of the coupler body 285. to leave. Next, as the piston rod 265 of the main cylinder 264 continues to descend as shown in FIG. The valves 286 are pushed against each other against the elastic force of the valve springs 284 and 287, and both the upper and lower valve seats open. In this case, the piston rod 270 of the auxiliary cylinder 269 is raised to avoid pressing the sleeve 289 by raising the pushing plate 258. When the piston rod 270 of the auxiliary cylinder 269 is further raised as shown in FIG.
Since the couplers 280 and 281 are pushed toward the point a, the couplers 280 and 281 are coupled together without coming off. Then, when the piston rod 265 of the main cylinder 264 is raised to the position shown in FIG. 23a, the couplers 280, 28
1 is completed. The connection of the coupler 278 corresponding to the plug adapter 271 of FIG. 20 has been described above, but at the same time, the coupler 279 corresponding to the other plug adapters 272, 273 and a small coupler (not shown) are also connected at the same time. Furthermore, as shown in FIGS. 18 and 20, an electrical connector 290 is detachably provided between the adapter mounting plate 255 and the death plate 256 via a spacer 291 and a bracket 292. The connector 290 also connects the couplers 278, 2
79... are connected at the same time.

Then, as shown in FIG.
On the support plate 56A of No. 1, there is an electric control panel 30 connected to an external power source with a rotary connector.
0 is mounted, and other support plates 56B,
56C, there is a hydraulic power unit 30 with an oil tank electrically connected to the electric control panel 300.
1, a cooling water pump 302, and the like are installed. Further, the electrical control panel 300 and the electrical connector 290 provided on the arm 64 side of each mold opening/closing unit holding section 55A, 55B, 55C are also connected by lead wires, and the electrical connector 290 described above is automatically connected. As a result, the limit switch etc. of the mold opening/closing unit 70 are moved to the rotary table 51.
It is electrically connected to the power source via the electrical control panel 300 regardless of the rotation of the motor. Further, the male side of the large, medium and small couplers 278, 279... is connected to the hydraulic power unit 301, the cooling water pump 302 and the seventh
It is connected to a water supply chamber 69 shown in FIGS. 8 and 8 by a hose or the like. Then, the large, medium and small couplers 2
The female side of 78, 279... is the adapter 276,
277... through the passage 304 provided in the death plate 256 and the inner hole 306 of the block 305 integrated with the death plate 256.
By being connected to the mold cooling device and the mold opening/closing cylinder 82, etc. in the mold opening/closing cylinder 82 with hoses, etc., the mold cooling of each mold opening/closing unit 70 and the operation of the hydraulic system are maintained regardless of the rotation of the rotary table 51. is configured so that it is carried out. In addition, coupler 278,
When uncoupling 279..., main cylinder 2
64 auxiliary cylinder 269 and d-c in FIG.
By operating in the order -b-a, the coupling can be easily broken by the action of the compression coil springs 254a, 260, the sleeve 289, and the ball 288.

A die casting method using the die casting machine configured as above will be explained. First, mold 8
Three sets of mold opening/closing units 70 equipped with mold opening/closing units 6 and 87 are arranged side by side on the roller 243 of the mold setup device 246, and, for example, the mold opening/closing unit holding part 55A is
The rotary table 5 is positioned at the station 140.
Stop 1. The ram 6 of the push-up cylinder 65 provided on the arm 64 of the mold opening/closing unit holding section 55A
After lowering the mold opening/closing unit 70, when the motor 245 of the mold setup device 246 is activated, the mold opening/closing unit 70
The mold opening/closing unit 70 moves forward and contacts the stopper 68 on the rotary table 51 side, and the limit switch on the frame 240 side is activated, causing the mold opening/closing unit 70 to open the arm 6.
4. Stop at the predetermined position above. At this time, the death plate 256 and couplers 278, 2 shown in FIG.
79, etc., because the mold opening/closing unit 70 enters at a low position and the rods 254, 259 are raised, their entry is not hindered. Then, when the ram 65b of the push-up cylinder 65 on the arm 64 side rises and engages with the ram hole 81 on the mold opening/closing unit 70 side and pushes up, the liner 79 is pressed against the horizontal member 64a, and the mold opening/closing unit 70 , for example, floats 20 mm above the upper surface of the base platen 34. When the main cylinder 264 and the auxiliary cylinder 269 for automatic coupler attachment/detachment provided on the extrusion frame 142 side of the second station 140 are activated at the predetermined timing described above at the same time as the mold opening/closing unit 70 is attached, the presser plate 266 attaches the adapter. The plate 255 is pushed down, and the pushing plate 258 is pressed down on the sleeve 2.
By raising and lowering 89, couplers 278, 2
The female couplers and male couplers 79 are coupled, and the electrical connector 290 is also connected. As a result, the mold opening/closing unit 70 and the rotary table 52 are connected by electrical wiring, water supply piping, and hydraulic piping. Therefore, the mold opening/closing cylinder 82 of the mold opening/closing unit 70 is operated to slightly press the movable mold 87 against the fixed mold 86, and apply the minimum required mold clamping force between the two molds 86,87.

Therefore, when the rotary table 51 is rotated 120 degrees counterclockwise in FIG. is attached to the holding portion 55B, and the coupler is coupled. During this mounting work, the work at the first station 30 and the third station 220 is suspended. After installing the second mold opening/closing unit 70, the rotary table 51
When further rotated 120 degrees counterclockwise, the next mold opening/closing unit holding part 55C is moved to the second station 1.
40, the third mold opening/closing unit 70 is attached thereto, and the first mold opening/closing unit 70 is located at the first station 30, so mold clamping and injection are performed thereon. That is, when the main ram 103 is lowered by hydraulic pressure, the spacer 106 comes into contact with the upper surface of the top frame 76 of the mold opening/closing unit 70 and pushes down the top frame 76 against the hydraulic pressure of the mold opening/closing cylinder 82 and the push-up cylinder 65. First, mold opening/closing unit 7
0 is seated on the upper surface of the mold contact surface 34f of the base platen 34, a large mold clamping force acts on both molds 86 and 87, and this mold clamping force can be withstood by the strong base platen 34. . At this time, since the injection cylinder 9 has been tilted in advance, the automatic water supply device 130 supplies the molten metal in the melting furnace 135 into the injection sleeve 20, and then the injection cylinder 9 is raised up. Then, the block 18 is raised by the ram 19 to fit the injection sleeve 20 into the fixed sleeve portion at the lower part of the fixed mold 86, and the plunger 16 is raised by the operation of the injection cylinder 9, and the molten metal 136 in the injection sleeve 20 is poured into the mold. Inject into cavities 86 and 87. When the molten metal 136 in the cavity solidifies and begins to cool, the pressure oil above the main ram 103 is removed, and the bubble cylinder 10
When the piston rod 109 of No. 7 is raised, the moving platen 104 is raised and the mold clamping force is released. As a result, the molds 86 and 87 retain the minimum necessary mold clamping force required only for cooling by the mold opening/closing cylinder 82, which was set at the beginning, and the mold opening/closing unit 70 is pushed up by the push-up cylinder 65 to form the base. It floats up from the platen 34. After injection, the lowered injection cylinder 9 is tilted to the pouring position.

Then, when the rotary table 51 is rotated 120 degrees counterclockwise while the mold opening/closing cylinder 82 is being operated while the product in the mold cavity is in the middle of cooling, the second mold opening/closing unit 70 is rotated. The mold opening/closing unit 70, which is in the middle of cooling the product, is located at the second station 140, so the mold is opened after continuing to cool the product. .

Here, "during product cooling" refers to the period when the mold is kept closed after the molten metal is injected into the mold cavity, and the molten metal in the mold cavity is solidifying and the solidified injected product is cooling. In addition, after injection, the period from when the product becomes ready to be taken out to when the mold is opened is called the product cooling period.

In the first place, each injection product has an optimum cooling time determined by its size, shape, etc. If the mold is opened too early and the product is taken out too quickly, the product will not harden sufficiently and its strength will be low, resulting in deformation. On the other hand, if mold opening and product removal are delayed, the mold becomes too cold and shrinks due to mold cooling, but the product shrinks even more. As a result, the product partially adheres to the mold in areas where the draft angle is small. For example, for a product with an H-shaped or U-shaped cross section that has two protrusions separated from each other in the product removal direction, if the product gets too cold, the product will shrink more than the mold, so the protrusions The inside of the mold tightly adheres to the surface of the mold. As described above, if the product is cooled too much, it may stick or stick to the mold depending on the shape of the product. Then, it becomes difficult or impossible to take it out from the mold. Therefore, each injection product naturally has an optimum cooling time and an optimum cooling temperature.

Therefore, from the end of injection until the mold is opened when it is time to take out the injected product from the mold,
It says the product is cooling down.

Note that if the mold is closed even after the optimum cooling time has passed, it is wasteful in terms of time cycle and is uneconomical. Therefore, it is not very meaningful to keep the mold closed for an unnecessarily long time after injection. However, depending on the shape of the product, there are some products that can be easily taken out of the mold after opening, even if the mold remains closed indefinitely after the time when cooling is considered complete. In such a case, as described above, there is no point in simply lengthening the time cycle, so the product is still being cooled until the mold is opened.

As described above, the first mold opening/closing unit 70, which has finished injection at the first station 30, rotates to the second station 140 during cooling of the product, where it continues to cool the product and then opens the mold. . That is, when the piston rod 83 of the mold opening/closing cylinder 82 is raised to raise the top frame 76, and at the same time, the piston rod 149c of the ejecting cylinder 149 is raised, the piston rod 149c of the mold opening/closing unit 70 and the fixed mold 86 are connected to each other. The biscuit part of the cast product is pushed up to the position shown by the chain line 149c in FIG. It rises together with the top frame 76. Therefore, the product removal device 1
After the receiving tray 178 of 60 is advanced by the hydraulic cylinder 173 and positioned below the opened movable mold 87, the piston rod 1 of the extrusion cylinder 150 is moved forward.
51 is lowered, the coupling ring 152 hits the boss portion 90b of the mold opening/closing unit 70 and pushes down the ejector plate 90, so that the product is pushed out of the movable mold 87 via the ejector plate 96 and the ejector pin 97, and the product is pushed out into the receiving tray 178. to support it. Then, after retracting the piston rod 174 of the hydraulic cylinder 173 and retracting the saucer 178 to the position shown in FIG.
02 is moved backward, the puller 207, which was previously located at the chain line position in FIG.
When the piston rod of the hydraulic cylinder 187 is raised, the cage 194 supported by the rollers 188 is rotated and lowered, and the water tank 184 is pulled upward.
The product is cooled by being immersed inside the tank. After cooling, the piston rod of the hydraulic cylinder 187 is lowered to return the car 194 to the position shown in the figure. When the piston rod 202 of the hydraulic cylinder 201 is further retreated, the products on the car 194 are moved to the puller 20.
7 and discharged onto the chute 208,
It slides on the chute 208 and is accumulated on the floor or on the transport vehicle. While removing this product, molds 86, 8
7 is cooled by cold water circulating between the water pump 302, the water supply chamber 69, and the coupler.

When the rotary table 51 is rotated 120 degrees counterclockwise during cooling of the molds 86 and 87, the second mold opening/closing unit 70 finishes injection and is located at the second station 140, and the third mold opening/closing unit 70 is located at the first station 30, the mold opening/closing units 70 are respectively operated to open the mold,
In addition to performing product removal work, mold clamping, and injection work, the first mold opening/closing unit 70 is located at the third station 220, so cleaning of the mold and treatment of the mold surface such as spraying a mold release agent are performed here. Perform mold clamping preparation work and mold matching.
In other words, the movable mold 87 of the mold opening/closing unit 70 that has rotated to the third station 220 with the mold opened
The mold spray device 22 is connected between the fixed mold 86 and the fixed mold 86.
One spray head 232 is inserted by the hydraulic cylinder 224, and the upper and lower molds 87, 86 are cleaned by jetting only air from the upper and lower blocks 231. Next, when air and mold release agent are jetted out in that state, the mold release agent will be released into the upper and lower molds 8.
It is sprayed and applied to cavities 7 and 86. Then, if necessary, insert the insert insertion device 23
After inserting the insert into the cavity in step 3,
Perform mold matching. That is, the mold opening/closing cylinder 8
When the second piston rod 83 is lowered, the top frame 76 is lowered, the molds 86 and 87 are brought together, and a predetermined necessary minimum mold clamping force is applied between the molds 86 and 87.

After this, when the rotary table 51 rotates twice by 120 degrees, the third mold opening/closing unit 70 completes one casting, and after that, the normal cycle starts, and every time the rotary table 51 is rotated by 120 degrees. to 1
Molding of individual products is carried out. That is, when the rotary table 51 rotates once, three products are cast and taken out. FIG. 26b is an explanatory diagram showing the required time for each step of the casting cycle according to the present casting method. When the mold is rotated, the rotation can be completed in approximately 6 seconds, so including this rotation, the mold clamping of the second mold can be started approximately 40 seconds after mold clamping starts. Similarly, mold clamping and injection for the third mold are started with a further 40 seconds delay. And the first station 30
40, which is the total time of mold clamping, injection and rotation in
Since the work at the second and third stations 1, including rotation, can be done in seconds, the time required for one cycle from the start of mold clamping to the start of the next mold clamp for one set of molds is 120 seconds. becomes. Therefore, the time required to cast three products is 120+
40+40=200 seconds, so each piece takes 67 seconds,
Productivity is greatly improved compared to the conventional 114 seconds shown in FIG. 26a.

If the dimensions of the product change and the mold needs to be replaced, the following method is used. First, three sets of mold opening/closing units 70 equipped with new molds are arranged side by side on the rollers 243 of the mold setup device 246 and prepared. If the number of products cast by the mold currently in use is, for example, 100, and the mold opening/closing unit 70 that took out the 98th product is located at the third station after taking out the product, the spraying operation for this etc. will be suspended. Next, when the rotary table 51 is rotated 120 degrees and the 98th mold is located at the first station and the 99th mold is located at the third station, mold clamping and injection are performed for these molds. All work and spraying operations will be suspended. Furthermore, rotate the rotary table 51 by 120 degrees and
If the 100th mold is located at the 1st station and the 100th mold is located at the 3rd station, clamping, injection work, spraying, etc. for these molds will be stopped, and the 97th mold will be stopped. When the mold reaches the second station, the mold opening/closing unit 70 equipped with the current mold is taken out. That is, the ram 65b of the push-up cylinder 65 is lowered to seat the mold opening/closing unit 70 on the roller 241, and at the same time, the main cylinder 264 and the auxiliary cylinder 269 of the automatic coupler attachment/detachment device are moved to d-c-b in FIG. -a, the coupling between the couplers 278, 279, . Therefore, when the motor 245 of the mold setup device 246 is rotated in the reverse direction, the rollers 241 and 243 are rotated in the reverse direction, and the mold opening/closing unit 70 is taken out onto the roller 243. After this, each time the rotary table 51 is rotated by 120 degrees, the
Mold opening/closing units 70 and 100 equipped with the second mold
The mold opening/closing unit 70 equipped with the second mold is sequentially taken out of the machine, and during this time, the work at the first and third stations is stopped. After taking out the 100th mold opening/closing unit 70, the rotary table 51 is rotated 120 degrees and the empty holding part from which the 98th mold opening/closing unit 70 was taken out is located at the second station, and the mold is removed in advance. Setup device 2
The new mold opening/closing unit 70 prepared on the roller 243 of 46 is mounted on the holding portion of the rotary table 51 by the above-described mounting method, and the coupler is coupled. Then, the rotary table is rotated 120 degrees, a new mold opening/closing unit 70 is attached to the empty holding part from which the 99th mold opening/closing unit 70 was taken out, and the coupler is connected, and a new mold is installed in the third station. Since the opening/closing unit 70 is located, the mold is opened, a mold release agent is sprayed, and then the molds are matched. Then, when the rotary table 51 is rotated 120 degrees, the matched molds are located at the first station, so mold clamping and injection for a new mold are started, and at the second and third stations, A new mold opening/closing unit 70 is installed, and the installed mold is opened, sprayed, and matched. After this, turn the rotary table 51
After two rotations of 120 degrees, the third new mold is located at the first station, and the normal casting cycle described above then begins.

In this way, by dividing the mold replacement work into the removal work and the installation work of the mold opening/closing unit, the rotation of the rotary table 51 can be performed without stopping, and the replacement work can be performed at the beginning and end of the replacement work. Since it is possible to continue the casting work for a mold other than the target mold or to start the casting work for a new mold, production does not decrease significantly.

In addition, in the above explanation, when installing a mold or replacing a mold, the mold opening/closing unit 70 is operated at the second station.
We have shown an example of stopping the work at the first and third stations while taking out the machine.
Mainly, all three sets of molds are for the same product,
This is a case where all three sets of molds are changed. However, 3
When only one set of molds is replaced for maintenance or maintenance, or when three sets of molds are used for different products, and one or two of them are replaced. In addition, while the mold opening/closing unit is being replaced, normal casting work can be continued at the first station, and production of molds other than those to be replaced can be prevented from decreasing.

In the die casting method and apparatus as described above, a mold opening/closing unit 70 for mounting the molds 86 and 87 is provided to be detachably attached to the rotary table 51, and a mold opening/closing cylinder 8 is attached to the mold opening/closing unit 70.
2, the mold 8 is closed before and after main mold clamping by the main ram 103 of the mold clamping device 100.
6 and 87 can be temporarily clamped with the minimum necessary mold clamping force, the following effects can be obtained. In other words, in die casting, a large mold clamping force is required from the start of injection to the completion of solidification of the molten metal, but after the solidification is completed, the need for mold clamping gradually decreases over time; Sustained force results in a loss of energy, but
After solidification, this device reduces the mold clamping force according to a function of its necessity, and maintains the required minimum mold clamping force only during the cooling period when the molten metal poured into the cavity solidifies until the mold is opened. Because it can be retained,
Energy consumption can be significantly reduced. Furthermore, in a rotary table type die-casting machine like the present device, the rotary table can be rotated during cooling of the product, which shortens the molding cycle and greatly improves productivity.

Although the present embodiment shows an example in which work stations are provided at three locations, there may be two or four or more work stations.

〔Effect of the invention〕

As is clear from the above explanation, as a die casting method according to the present invention, the same number of work stations as the mold opening/closing units are installed on a rotary table section on which a plurality of mold opening/closing units that hold molds and can be opened and closed are mounted. When the product in the mold in the main mold clamping/injection device in one of the work stations is in the middle of cooling, and the mold in the other work station has completed preparation for mold clamping. Then, the main mold clamping of the mold that is in the middle of cooling is released and only temporary mold clamping is performed by the mold opening/closing unit, and the time point at which the rotary table is rotated one pitch is set so that the molten material injected after the final mold clamping is injected into the mold. This includes the point at which the product is almost solidified within the container and begins to develop rigidity, and the point at which product removal is completed.

In addition, the die-casting equipment includes multiple mold opening/closing units that can be opened and closed and are equipped with a mold matching device that supports both fixed and movable molds and temporarily clamps these two molds, and each of these mold opening/closing units can be attached and detached. A rotary table that rotates intermittently along the top surface of the machine base fixing plate is provided with holding parts at multiple equal positions in the circumferential direction, and the mold opening/closing unit held on this rotary table is arranged on the orbital trajectory. a plurality of work stations arranged in the process order, and a main mold clamping system which seats the mold mounting base on the machine fixing plate and lowers the top frame of the mold opening/closing unit further than the temporary mold clamping state. It is interposed between the main mold clamping/injection device and product ejecting device equipped with a mechanism, and the top surface of the rotary table and the mold opening/closing unit held by this, and fixes the mold opening/closing unit to the machine base when other than main mold clamping. By installing a push-up cylinder that floats above the board, mold clamping, injection work, and other work can be performed on multiple sets of molds at the same time. The casting cycle per product is significantly shortened compared to other equipment, which significantly improves productivity, and in addition to the mold clamping cylinder, separate mold opening/closing cylinders can be installed on the mold opening/closing unit side. Therefore, the mold clamping force can be reduced after the molten metal has solidified, so the energy for mold clamping can be significantly reduced. Also, when rotating the mold opening/closing unit that holds the mold on a rotary table, or when doing work other than main mold clamping, keep the mold opening/closing unit floating from the machine fixing plate. When performing main mold clamping by strongly pressing the mold in the mold opening/closing unit with the mold clamping cylinder, the mold opening/closing unit itself is directly supported by the machine fixing plate, so that the main mold clamping and the rotation of the mold opening/closing unit are prevented. You can perform movements such as moving smoothly, reliably, and easily.

[Brief explanation of drawings]

1 to 24 and FIG. 26b show embodiments of the die casting apparatus according to the present invention, which are shown to explain the die casting method according to the present invention.
The figure is the plan view, Figure 2 is the AA sectional view of Figure 1,
Fig. 3 is a plan view of the first station, Fig. 4 is a BB sectional view of Fig. 3, Fig. 5 is a side view from C in Fig. 3, Fig. 6 is a plan view of the rotary table, and Fig. 7 is a plan view of the rotary table. 6 is a DD sectional view, FIG. 8 is a front view from E in FIG. 6, FIG. 9 is an enlarged FF sectional view in FIG. 6, FIG. 10 is a vertical sectional view of the mold opening/closing unit, and FIG. 11 is a Similarly, Fig. 12 is a plan view, and Fig. 12 is a front view from G in Fig. 10.
Figure 3 is a front view of the second station, Figure 14 is a side view, and Figure 15 is a front view of the product take-out device.
FIG. 16 is a side view, FIG. 17 is a plan view, FIG. 18 is a front view showing one set of upper and lower parts of the automatic coupler attachment/detachment device, FIG. 19 is a side view showing one set of upper and lower parts of the automatic coupler attachment/detachment device, and FIG. 13 is an enlarged plan view from H view, a side view from J view from either FIG. 21 or 20, FIG. 22 is a sectional view from KK in FIG. , Fig. 24 is a longitudinal cross-sectional view of a safety valve for mold clamping, Fig. 25 is a longitudinal cross-sectional view of a conventional vertical mold clamping vertical casting die casting machine, and Fig. 26 a is a longitudinal cross-sectional view of the conventional die casting machine shown in Fig. 25. FIG. 26b is an explanatory diagram showing the time required for dividing the casting cycle into each step; FIG. It is a diagram. 30...First station, 34...Base platen, 51...Rotary table, 55A, 55
B, 55C... Mold opening/closing unit holding part, 64...
Arm, 65... Push-up cylinder, 70... Mold opening/closing unit, 100... Mold clamping device, 101... Injection device, 140... Second station, 160...
Product removal device, 220...Third station, 2
21... Mold spray device, 246... Mold setup device.

Claims (1)

[Scope of Claims] 1. A plurality of mold opening/closing units that hold a fixed mold and a movable mold and can be opened and closed are mounted on a rotary table section mounted at equal positions in the circumferential direction, and the same number of mold opening/closing units as the mold opening/closing units Work stations are provided, and the product in the mold in the main mold clamping/injection device installed in one of the work stations is in the middle of cooling, and
When the mold in another work station has completed preparation for mold clamping, the main mold clamping of the mold that is currently being cooled is released and only temporary mold clamping is performed by the mold opening/closing unit, and the mold is temporarily clamped by the mold opening and closing unit. The point in time at which the rotary table is rotated one pitch includes at least the point in time when the molten material injected after the main mold clamping almost solidifies in the mold and begins to generate rigidity, and the point in time when product removal is completed. Characteristic die casting method. 2. Consisting of a mold mount that supports a fixed mold and a top frame that is formed to be able to rise and fall freely relative to the mold mount to support a movable mold, the top frame is lowered to temporarily clamp the two molds. A plurality of mold opening/closing units each equipped with a mold matching device and holding parts for removably holding each mold opening/closing unit are provided at multiple equal positions in the circumferential direction and rotate intermittently along the upper surface of the machine base fixing plate. a rotary table for rotating the mold, a plurality of work stations arranged on the orbit of the mold opening/closing unit held on the rotary table, and a plurality of work stations arranged in the order of the process to attach the mold mounting base to the machine. A main mold clamping/injection device and a product ejecting device are provided with a main mold clamping mechanism for seating the top frame on the base fixing plate and further lowering the top frame from the temporary mold clamping state, and a top surface of the rotary table and a product holding device. A die-casting apparatus characterized in that a push-up cylinder is provided between the die opening and closing unit and the die opening and closing unit to float the die opening and closing unit from the machine fixing plate at times other than the main mold clamping.