JPH071101A - Vertical injection device - Google Patents

Abstract

PURPOSE:To improve the yield of a formed product by arranging an inner plunger, in which molten metal in an injection sleeve can be cast into a cavity in a die from the lower part, in the inner periphery of an outer plunger. CONSTITUTION:A vertical type injection apparatus 13 is arranged in a pit 1. By using the apparatus 13, the molten metal in the vertical casting sleeve is cast into the cavity in the clamped dies 11, 12 from just the lower direction. In this vertical type injection apparatus 13, the injection sleeve 30 arranged at the outermost peripheral part and the outer plunger 38 arranged at the inner periphery thereof are provided so as to be freely slided. Further, the inner plunger 28 arranged so as to be possible to cast the molten metal poured in the injection sleeve 30 into the cavity in the die from the lower direction, is arranged so as to be freely slid to the inner periphery of the outer plunger 38. The inner plunger 28 is lifted with an injection cylinder 20 and a piston rod 22. By this method, the compact vertical type injection apparatus can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection device for injecting molten metal from directly below a mold after pouring the air in a mold cavity and an injection sleeve with an inert gas, and then pouring the melt.

[0002]

2. Description of the Related Art A conventional vertical casting die casting machine is further classified into a vertical clamping die and a horizontal clamping die according to the clamping direction thereof, and these are all vertically tiltable or horizontally movable. A mold injection device is provided directly below the mold. When injecting a molded product, after the mold is clamped, the injection device is tilted or moved to supply the molten metal into the injection sleeve, and after returning to the injection position of the injection device, the upper end portion of the injection sleeve is pressed. The molten metal is injected into the cavity of the mold by bringing it into contact with the lower part of the mold.

[0003]

By the way, in the case of such a conventional vertical casting die casting machine, air stays in the space from the cavity formed between the molds to the injection sleeve of the vertical injection device. In this state, when the vertical injection device is tilted to pour into the injection sleeve and when the molten metal is cast into the mold cavity, the molten metal reacts with the air staying in the space to oxidize, or Depending on the molten metal used, it burns, and impurities such as oxides are mixed into the molded product, which deteriorates the quality of the molded product.

It is an object of the present invention to provide a vertical injection device which improves the quality of a molded product by paying attention to the above conventional problems and making the injection sleeve shallow and shortening the time until casting. It is a thing.

[0005]

In order to achieve the above object, a vertical injection apparatus according to the present invention is designed so that a molten metal in a vertical casting sleeve is introduced directly into a cavity of a mold which is clamped. A vertical injection device for casting from an injection sleeve provided on the outermost peripheral portion, an outer plunger slidably provided on the inner circumference of the injection sleeve, and a slidable inner circumference of the outer plunger, and The inner plunger is provided so that the molten metal poured into the injection sleeve can be cast into the mold cavity from below.

[0006]

With such a structure, while preventing the invasion of outside air, the molten metal is gently poured from the pouring port into the injection sleeve, and the cavity is cast. Further, since it is possible to prevent the formation of a solidified layer during casting of the molten metal, a large presser effect can be obtained with a small force when the molten metal is cast into the cavity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the vertical injection device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of a vertical casting die casting machine, FIG. 2 is an enlarged cross-sectional view of a main part according to the present embodiment, FIG. 3 is a plan view taken along the line AA of FIG. 4, and FIG. 4 is an embodiment of the present invention. It is such a vertical injection device.

In the figure, a pit 1 having a rectangular shape in plan view is provided below the floor surface, and both ends of this pit 1 are
A pair of machine bases 2 framed by steel plates, shaped steels, etc. extend upright on the floor and are erected upright. One end of these machine bases 2 has a fixed platen formed in a substantially square shape. 3 is placed and its leg portions 3a are fixed by bolting.

An end platen 4 is erected and fixed to the other end of the machine base 2 so as to be movable and adjustable. The fixed platen 3 and the end platen 4 have four tie rods 5 at four corners. Are connected, the movement is adjusted, and then fixed with a nut 6. Reference numeral 7 denotes a movable platen which is formed in the tie rod 5 by fitting the holes at the four corners so as to be able to move forward and backward with respect to the fixed platen 3. The piston rod 9 is moved forward and backward by hydraulic pressure to move forward and backward with respect to the fixed platen 3.

A fixed mold 11 having cavities 11a and 12a and a movable mold 12 are mounted on the fixed platen 3 and the movable platen 7, respectively, and the movable platen 7 is opened by being driven by a mold clamping cylinder 8. By advancing from the state, the mold is clamped as shown in FIG.

Next, the vertical casting type injection device 13 arranged in the pit 1 will be described. The vertical injection device 13 of this embodiment includes an injection sleeve 30 and an inner plunger 2.
8. It has an outer plunger 38 and is configured to be slidable with respect to each other. Reference numeral 20 denotes an injection cylinder rotatably supported by a seat 18 fixedly provided on the bottom surface of the pit 1 via a pin 19, and an injection plunger 24 is provided on a piston rod 22 thereof via a coupling 26. The injection plunger 2 is connected by the hydraulic pressure of the injection cylinder 20.
4, the inner plunger 28 is fixed to the upper end surface of the injection plunger 24 and slidably engages with the outer plunger 38 described later. The molten metal poured into the injection sleeve 30 is supplied to the inner plunger 28.
The inner plunger 28 and the mold sleeve 14 are coaxially arranged so that the inner plunger 28 ascends while sliding in the mold sleeve 14 when the inner plunger 28 is cast into the cavities 11a and 12a due to the ascending. There is.

The docking frame 32 having the injection sleeve 30 fixed to the upper end surface has a hole at the lower end engageable with the plunger coupling 26, and the injection cylinder 2
No. 0 is supported by fitting a pair of docking rams 34, which are diagonally planted on the upper surface of 0 (FIG. 3), into the ram holes, and a pressure oil chamber 36 provided in the docking frame 32 is provided.
Pressure oil and plunger coupling 26 introduced into
The docking frame 32 is configured to move up and down by moving up and down.

When the injection sleeve 30 moves up,
When the injection sleeve 30 is brought into engagement pressure contact with the lower parts of the fixed mold 11 and the movable mold 12 and the docking frame 32 is lowered, the injection sleeve 30 is separated from the lower parts of the mold. Further, an outer plunger 38 is slidably provided on the inner circumference of the injection sleeve 30 described above. The plunger frame 4 with the outer plunger 38 fixed to the upper end surface
0 are spaced apart by a plurality of support rods 42 planted on the upper surface of the bottom plate 32a of the docking frame 32, and as shown in FIG. 3, a pair of plunger rams 44 planted on the bottom plate 32a. Are supported by fitting them into the ram holes, and by the pressure oil introduced into the pressure oil chamber 46 provided in the plunger frame 40 and the lowering of the plunger coupling 26, the plunger frame 40
Is configured to move up and down.

A tilting cylinder 48 is provided on the side wall of the pit 1.
Is pivotally supported by a seat 47 and a pin 49 so as to be tiltable, and a rod 51 connected to a piston 50 of the tilting cylinder 48 has an end thereof connected via a joint 53 and a pin 55 to an injection cylinder. It is pivotally attached to 20 sides. In addition, both the docking frame 32 and the plunger frame 40 are lowered so that the two frames 32,
By operating the tilting cylinder 48 and moving the piston rod 51 forward and backward with the space between the lower part 40 and the lower parts of the molds 11 and 12 separated, the vertical casting injection device 13 as a whole is tilted and lubricated as shown by the chain line in FIG. It is configured to stand and tilt between the agent spray position and the standing pouring and injection positions shown by the solid lines.

As shown in FIG. 2, a mold degassing device 52 is arranged on a discharge passage communicating from the cavities 11a and 12a of both molds 11 and 12 to the outside of the molds 11 and 12. An inert gas supply container 85, which is an inert gas supply source, is connected from the gas venting device 52 via a pipe 81, a pipe 82, a solenoid valve 83, and a pipe 84. On the other hand, a pipe 86 and a solenoid valve 87 are connected by branching from a pipe 81 and a pipe 82 which are a part of a pipe connecting the mold degassing device 52 to the inert gas supply container 85. 87
Is connected to a pipe 88 and a pipe 89 which are further branched. A vacuum tank 91 and a pipe 92 are provided to the pipe 88.
Is connected to a vacuum pump 93 via a motor, and the vacuum pump 93 is driven by a motor 94. on the other hand,
A solenoid valve 90 is connected to the pipe 89.

Reference numeral 62 denotes a molten metal holding furnace. A hot water supply pipe 64 is provided above the injection sleeve 30 from the molten metal holding furnace 62, particularly above the outer plunger 38 slightly separated from the inner plunger 28, and an outer plunger is provided. A pouring port 68 is opened above 38, and an induction heating device (not shown) is provided on the outer peripheral portion of the hot water supply pipe 64 so that the molten metal temperature does not decrease due to heat radiation when pouring the molten metal 70. In addition, the inert pressure gas 5 from above the molten metal holding furnace 62
It is possible to inject molten metal 7 into the molten metal holding furnace 62 to press the molten metal surface and to pour the molten metal into the injection sleeve 30 via the molten metal supply pipe 64. Further, a slide valve 66, which is fixed to the cylinder device 72 and is openable and closable, is arranged at the upper end of the injection sleeve 30 so as to completely shut off the outside air from the inside of the injection sleeve 30.
Reference numeral 73 is a lubricant spraying device.

The operation of the vertical injection device constructed as above will be described. First, the movable platen 7 is moved forward by the mold clamping cylinder 8 to clamp the molds 11 and 12, and then, as shown in FIG.
As shown in FIG.
Is advanced to incline to the chain line position, the lubricant is spray-supplied from the lubricant spray device 73 to the injection sleeve 30, and the injection cylinder 20 is erected. Next, when oil is sent to the pressure oil chamber 36 of the docking frame 32 via a pipe (not shown),
The docking frame 32 starts to rise at a predetermined speed,
The injection plunger 24 starts to rise integrally with the docking frame 32 and the plunger frame 40 when the bottom plate of the docking frame 32 contacts the coupling 26.

At the upper limit of the injection sleeve 30, both molds 1
At the end of charging into the step portions 1 and 12, the inner plunger 28 and the outer plunger 38 have the pouring port 6 shown by the solid line in FIG.
It has reached a position close to 8. Next, the cylinder device 7
2 is supplied with pressure oil to close the slide valve 66, and the solenoid valve 83 is kept in the off state.
Is turned on to activate the motor 94 of the vacuum pump 93. In this way, the air in the molds 11 and 12 and the injection sleeve 30 is sucked and removed by being electrically connected to the cavities 11a and 12a through the mold degassing device 52. Air is sucked in the cavities 11a and 12a for a certain period of time, and after the air is removed, the solenoid valve 87 is turned off and the motor 94 of the vacuum pump 93 is stopped. Then, the solenoid valve 83 is turned on to connect the inert gas supply container 85 to the cavities 11a and 12a to blow compressed inert gas into the cavities 11a and 12a for a predetermined time, and the slide valve 66 is opened. The cavities 11a, 12a
And the inside of the injection sleeve 30 is made an inert gas atmosphere.

After completely replacing with the inert gas, the solenoid valve 83 is turned off (the solenoid valves 87 and 90 remain in the off state), and immediately the inert pressure gas 57 is blown into the molten metal holding furnace 62 to hold the molten metal holding furnace. A molten metal in 62 is poured through a hot water supply pipe 64 to a pouring port 68.
Then, pouring into the injection sleeve 30 is started. After the pouring is completed, pressure oil is introduced into the cylinder device 72 and the slide valve 66
Closed. Then, the supply of the compressed inert gas is stopped, and the pressure oil is introduced into the pressure oil chamber 46 to simultaneously raise the inner plunger 28 and the outer plunger 38 and raise the molten metal 70 into the mold sleeve 14.

Finally, pressure oil is introduced into the injection cylinder 20 to further raise the inner plunger 28 to move the cavity 1
Molten metal 70 is injected into 1a and 12a. The inert gas in the mold cavities 11a and 12a at the time of injection is the mold degassing device 52, the pipes 81 and 86, the solenoid valve 87, and the pipe 8
It is released from the solenoid valve 90 into the atmosphere via 9. At this time, the inert gas in the mold cavities 11a and 12a is
The electromagnetic valve 87 may be turned on and discharged into the atmosphere by vacuum suction by driving the vacuum pump 93.
The injection plunger 24, the docking frame 32, and the plunger frame 40 are lowered after waiting for the molten metal 70 in the cavities 11a and 12a to solidify,
By opening 2 and taking out the casting product in the cavities 11a and 12a, one casting cycle is completed.

[0021]

As is apparent from the above description, the vertical injection apparatus according to the present invention allows the molten metal in the vertical casting sleeve to enter the cavity of the clamped mold from directly below. A vertical injection device for casting, comprising an injection sleeve provided at the outermost peripheral portion, an outer plunger slidably provided on the inner circumference of the injection sleeve, and an injection slidable on the inner circumference of the outer plunger. Since the inner plunger was provided so that the molten metal poured into the sleeve could be cast into the mold cavity from below, the diameter of the injection sleeve could be increased and the diameter of the inner plunger could be decreased. The resulting weight of the biscuit portion is reduced, and the yield of molded products is greatly improved. Further, by making the shaft center of the inner plunger and the shaft center of the outer plunger eccentric, a compact vertical injection device can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a vertical casting die casting machine according to the present embodiment.

FIG. 2 is an enlarged sectional view of a main part of the embodiment.

FIG. 3 is a plan view taken along the line AA of FIG.

FIG. 4 is a vertical injection device according to an embodiment of the present invention.

[Explanation of symbols]

 4 End Platen 5 Tie Rod 7 Movable Platen 10 Toggle Mechanism 11 Fixed Die 12 Movable Die 13 Vertical Casting Injection Device 14 Die Sleeve 20 Injection Cylinder 24 Injection Plunger 26 Plunger Coupling 28 Inner Plunger 30 Injection Sleeve 32 Docking Frame 34 Docking Ram 36,46 Pressure oil chamber 38 Outer plunger 40 Plunger frame 44 Plunger ram 48 Tilt cylinder 52 Mold degassing device 62 Molten metal holding furnace 64 Hot water supply pipe 66 Slide valve 68 Pouring port 70 Molten metal 73 Lubricating spray device 83,87 , 90 Solenoid valve 85 Inert gas supply container 91 Vacuum tank 93 Vacuum pump

Claims (1)

[Claims] 1. A vertical injection device for injecting the molten metal in a vertical casting sleeve into a cavity of a mold which is clamped from directly below, and an injection sleeve provided at an outermost peripheral portion,
An outer plunger slidably provided on the inner circumference of the injection sleeve and a slidable inner circumference of the outer plunger, and the molten metal poured into the injection sleeve can be cast into the mold cavity from below. A vertical injection device characterized by having an inner plunger provided in the.