JPS59107759A - Pressure casting device - Google Patents

Abstract

PURPOSE:To perform casting without inclusion of gas, etc. and to obtain a product having excellent quality by sucking and evacuating the gas in a cavity by the operating stroke of an injection cylinder. CONSTITUTION:A vacuum cylinder 5 is provided coaxially with an injection cylinder 3 and an injection sleeve 1, and a communicating pipe 6 connecting to the overflow port 15b of a cavity 15 is provided to a suction port 5b in the advancing stage of the piston 5a of a vacuum cylinder 5. The cylinder 5 is operated slowly via a throttle valve 6a to evacuate the inside of the cavity 15 in the initial period of its operation. When a switch 8 is thus turned on by an operating part 4a, a solenoid valve 7a is opened and a large volume of the gas in the vacuum cylinder is sucked.

Description

[Detailed description of the invention] 4: The invention was founded as a pressurized fA wave device. The gas in the cavity is effective with a casting stroke of 4 liters (
Easy operation and equipment for Yusada's cast body to reduce the discharge pressure
The purpose is to provide a device that can be manufactured accurately and easily.

It is well known that when performing 1x-r4 pressure casting such as die casting, the air in the cavity and the gas in the pond form the casting mold and give the 11-dimensional effect of the cast body. It has been previously proposed to reduce the pressure inside the cow's cage. However, in the conventional technology, special vacuum equipment is required to reduce the pressure inside the cavity as described above, which makes the equipment complex and large, and requires the operation of multiple valves, making the operation complicated. However, there are also disadvantages and disadvantages such as it is not easy to obtain appropriate timing for these operations.

The present invention was devised after repeated studies in view of the above-mentioned circumstances, and utilizes the casting stroke of the injection plunger to effectively discharge the gas inside the cavity within the time required for metal filling, thereby achieving a preferable pressure reduction. We succeeded in forming a hard die-cast body automatically and using easy operation and equipment.

That is, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. A movable mold 14 attached to a movable platen 13 is provided to the fixed grating 110 and the fixed view 12, and a cavity 15 is formed between the movable mold 14 and the fixed mold 12, and the injection plunger 2 is inserted into the cavity 15. The injection sleeve 1 having the
As is conventionally known, the molten metal is injected from the hot water supply port 1a, and the injection plunger 2 as described above is provided with an injection cylinder 3, and the injection operation is performed by the piston rod 4. belongs to. However, in the present invention, in the structure as described above, a vacuum cylinder 5 is provided coaxially with the injection cylinder 3 and the injection sleeve 1, so that the cavity 1 is provided at the suction port 5b when the piston 5a of the vacuum cylinder 5 moves forward.
The vacuum cylinder 5 is connected to the injection cylinder 3.
The fixed type 12 and the movable type 14 have an automatic flow chamber 16. Inflow prevention guarantee
17 and the connecting pipe 6 through the filter 18.
is connected.

In addition, in the one shown in FIG. 1, the connecting pipe 6 as described above is used.
Another connecting pipe 7 having a solenoid 77a is connected in parallel to a part of the connecting pipe 6, and a throttle valve 6a is provided in the connecting pipe 6 to completely reduce the amount of gas passing through the cylinders 3.5. The piston/rod 4 for operating the solenoid valve 7a is provided with an operating section 4a for turning on and off a switch 8 for the solenoid valve 7a.

That is, at the beginning of the operation of the vacuum renoder 5 described above, the throttle valve 6a is operated slowly to reduce the pressure inside the cavity 15.
When the solenoid valve γa is fully turned on, the solenoid valve γa is opened and a large amount of gas inside the cylinder is suctioned.As shown in FIG. 2 or 3, the injection cylinder 3 and ) (It can be implemented without making the vacuum cylinder 5 coaxial. In other words, the vacuum cylinder 5e in FIG. 2 is provided below the injection cylinder 3 and is inserted between the injection cylinder 3 and the injection sleeve 1. An arm 9 is fixed to the cylinder rod 4 which is attached to the piston rod 19 of the vacuum cylinder 58.
The rest of the structure is the same as that shown in FIG. 1 above.

That is, by configuring as shown in FIG.
It is clear that the length of the entire device can be completely shortened and the equipment can be made compact compared to the one shown in the figure. Furthermore, the one in FIG. 3 uses a plurality of vacuum cylinders 5f and 5fi, and these cylinders 5f' are arranged on both sides (or the top and bottom) of the cylinder lot 4, and the device can be made more compact in the same way as above. In addition, as shown in FIG. 4, the piston 5ae of the vacuum cylinder 5 is formed in multiple stages, with a small diameter piston part 5al and a large diameter piston part 58', in order to achieve a balanced working relationship. Moreover, by using cylinders adapted to these pistons 5a'5a, 5a, it is possible to obtain the same effect without using the throttle valve 6a or solenoid valve 7a as shown in FIG. can. That is, in the ψ period of piston advancement, only a portion of the cylinder related to the relatively small diameter piston 5a' is sucked from the connecting pipe 6, and the suction depressurization from the cavity 15 is slight.
After moving forward as shown in Figure (B), the large diameter piston 5
A large amount of suction depressurization is achieved by a', less gas is drawn into the molten metal, and the molten metal is accurately poured into the cavity, allowing smooth casting to be completed as shown in FIG. 4 (CC). That is, regarding these relationships, now the total diameter d of the rod 4
o, the diameter of the small-diameter piston 5a' is 'j&:d1, and the diameter of the large-diameter piston 5a' is d2, then -(d
It is clear that the suction is dominated by H-(d, l-d♂), and then the suction is dominated by H-(d, l-d♂), according to the configuration shown in Fig. 4. There is an advantage that the configuration of the connecting pipe 6 as well as the above-mentioned valves is simplified.

As is clear from the casting process shown in Fig. 4 above, in the case of the present invention, almost no molten metal enters into the cavity in the small amount suction region up to B in the same figure. The cylinder 5 may be arranged as shown in Fig. 5. That is, the connecting pipe 6 is connected to the middle part of the cylinder 5 (the position where it moves to the mass suction area in the case of Fig. 4), as shown in Fig. 5. The pressure inside the cavity is reduced by the large amount of suction controlled by the structure, and favorable casting can be carried out in this state. It is clear that there is no practical problem even if the piston becomes a little thick, and if rapid pressure reduction is achieved after the process shown in Fig. 5 (B), the same effect can be obtained, and the
The configurations of a and the cylinder 5 can be appropriately simplified.

In particular, the I/ll of the vacuum cylinder mentioned above: The period from the small amount suction area to the large amount suction area of the cavity where the gas is sucked by the moving cylinder is the molten metal casting process (t speed of the plunge speed in this). By adjusting the timing of switching from high speed f to f, the stirring action of the hot water inside the sleeve due to atmospheric suction from the inlet 1a etc. can be prevented. You can obtain a high-quality body.

Due to the above-mentioned non-inventions, pressure casting of this type of die-casting, etc. is difficult because of the special A: the mechanism and the combination of the valve or the arrangement/meter and its Without requiring any equipment or operation for opening and closing, the injection plunger can be opened and closed using the injection plunger itself.
This makes it possible to draw effective gas and reduce the pressure within the tee, thereby making it possible to carry out appropriate casting without gas entrapment and provide a vague product. f is the most effective invention. In addition, it is possible to store the gas sucked from 4 by providing a check box and a tank in the middle of the baggy circuit, such as the one in front of the chair. If this application is applied to die casting with active gas replacement, etc., it will cost 90% to waste the mixed residue (sifted air containing active gas) that has been sucked in for other purposes.

[Brief explanation of drawings]

The drawings are intended to show embodiments of the present invention, and FIG. 1 shows the overall structural relationship of the device of the present invention. The main parts of the main part of the defense plan, Figures 4 and 5 are shown in Figure 4. Another embodiment of the present invention
In order to show the operation process step by step, a cross-sectional explanatory diagram of the main parts -C is required. In these figures, 1 is the injection sleeve, Ia is the bath water inlet, 2d is the injection plunger, 3 is the injection cylinder, 4 is the piston rod, 5 and 5e, 5
fd b+yum cylinder, 5a, 5a, 5a a, its piston. 6 is the operation valve, 5a is the flow valve, Ia is the other connecting pipe, ra is the renoid valve, 8 is the switch, 9 is the arm, 11 is the fixed platen, 12 is the fixed type, 13 is the movable platen, 14 Ijiq dynamic type, 15 is cavity,
16 is an overflow chamber, 17f is a drift prevention guarantee chamber, and 18 is a filter. Patent applicant Nippon Light Metal Co., Ltd. Inventor Toshiyuki Kawai

Claims (1)

[Scope of Claims] Molten metal is injected into the cavity by the working stroke of the injection cylinder through an injection sleeve having a 1° injection plunger to form a casting. A vacuum cylinder that can be activated by the operation stroke is provided, and the vacuum cylinder and the upper cylinder are connected and sealed through a connecting pipe, and the cylinder of the above-mentioned injection cylinder is sealed. /
Il: Dynamic stroke 1 is used to draw down the gas in the cavity to reduce the pressure, and t is similar to 11-f. 2. The vacuum cylinder is connected to the vacuum cylinder through the overflow of the cavity.Claim 1
Item 1. Pressure casting apparatus described herein. 3. Four JR ejection cylinders and four vacuum cylinders are provided on the same feed gland, and IC Patent Claims No. 1, 1, and 6
My own Tonichi pressure moromi brewing device. 4. An injection cylinder and a vacuum cylinder are provided in parallel, and the rod of the vacuum cylinder is made from an arm I with four injection cylinders. Pressure casting equipment. 5. Connect one part of the connecting M pipe in parallel with another connecting pipe, and install a restrictor and a solenoid valve on these connecting pipes.
A switch f for operating the solenoid valve is provided on the cylinder rod l, and the solenoid valve is fully opened at the middle of the #U output 7 cylinder ρ operation stroke, and the vacuum cylinder i is moved into the cavity. In order to increase the amount of gas suctioned, f/1 patent claim 1 l
Pressure casting apparatus described herein. 6. The pistons of the vacuum cylinder with VF installed coaxially with the injection cylinder have different diameters, and the cylinder circles & are made to correspond to these pistons. l Pressure casting apparatus according to this description.Claim 2 f, in which a connecting pipe is opened in the middle part of the 7° injection cylinder and the same 4'dJ uC r'f/c vacuum cylinder. Pressure casting equipment.