JP3096382U - Vacuum die casting equipment - Google Patents

Abstract

(57) [Summary] (With correction) [Problem] To improve the degree of vacuum in a cavity and cast a sound casting with almost no cavities. SOLUTION: An annular suction groove 17 is formed on a mold matching surface 4a of a movable mold 4 so as to surround a cavity 8. An annular seal groove 21 is formed on the mold matching surface 6a of the movable holder 6 so as to surround the annular suction groove 17, and the annular seal member 22 is closed between the fixed holder 3 and the mold matching surfaces 3a, 6a of the movable holder 6 with the mold closed. It is fitted into the annular seal groove 21 so as to seal.

Description

[Detailed description of the invention]       [0001]     [Technical field to which the invention belongs]   This invention relates to the improvement of vacuum die-casting equipment, especially for measures against high vacuum. It is.       [0002]     [Prior art]   Generally, in a vacuum die-casting apparatus, a fixed type is a fixed holder and a movable type is a movable holder. Respectively, and the fixed mold and the movable mold are closed with the mold closed. A cavity is formed between them.       [0003]   In addition, a rubber annular sealing material is provided between the mold separation surfaces and between the mold It is common practice to prevent the pressure and to maintain the degree of vacuum in the cavity (for example, And Patent Document 1).       [0004]       [Patent Document 1]           Japanese Patent No. 2500863 (page 3, FIG. 1)       [0005]     [Problems to be solved by the invention]   However, place the annular sealing material near the cavity between the mold mating surfaces of the fixed mold and the movable mold. If it is provided, it is affected by the heat of the mold temperature, which is high due to the melting heat of the molten metal. Degrades due to heat, and the sealing performance decreases. As a result, it becomes impossible to cast a sound casting having almost no cavities.       [0006]   On the other hand, the annular sealing material is mated with the fixed holder and the movable holder far from the cavity. When provided between the sloping surfaces, thermal deterioration of the annular sealing material as described above can be avoided, but the fixed type Slightly formed between the split surface between the fixed holder and the split surface between the movable die and the movable holder The outside air enters through a small gap and the degree of vacuum in the cavity is reduced. It is impossible to cast a sound casting with almost no.       [0007]   This invention was made in view of such a point, and the purpose is to Improve the degree of vacuum in the cavity to cast a sound casting with almost no voids. And       [0008]     [Means for Solving the Problems]   In order to achieve the above objective, the present invention is based on An annular suction groove is provided on the fin.       [0009]   More specifically, the present invention is designed to fit the fixed holder to the fixed holder with the mold mating surface exposed. The fixed mold held and the mold mating surface exposed facing this fixed mold In the mold closed state of the movable mold fitted and held in the movable holder, the fixed mold and the movable mold Vacuum die casting device for casting a casting by evacuating the cavity formed between The following measures were taken for the installation.       [0010]   That is, the present invention is based on the fact that one of the fixed type and the movable type has an annular surface. A suction groove is formed to surround the cavity, and the fixed holder and the movable On one of the mating surfaces of the rudder, the annular seal groove surrounds the annular suction groove. Forming surface of the fixed holder and the movable holder when the annular sealing material is closed. It is fitted in the annular seal groove so as to seal the space.       [0011]   With the above configuration, according to the present invention, between the divided surfaces of the fixed type and the fixed holder, Outside air enters through a slight gap between the split surface of the mold and the movable holder and reaches the mold mating surface. However, this outside air is drawn into the annular suction groove and not into the cavity. Improved vacuum in the cavity and high quality and sound casting with almost no voids You.       [0012]   In addition, the above-mentioned annular sealing material is used for the fixed holder and the movable holder far from the cavity. Since it is provided on one of the mating surfaces, it is hardly affected by the heat of the molten metal, Thus, the sealing performance is ensured. Furthermore, if the molten metal in the cavity is Even if the molten metal flows out between the contact surface and the movable mold mating surface, The annular seal is damaged because it does not flow into the groove and reaches the outer annular seal Even if continuous casting is performed for a long time without performing the method, a stable degree of vacuum can be obtained.       [0013]     [Embodiment of the invention]   Hereinafter, embodiments of the present invention will be described with reference to the drawings.       [0014]   FIG. 2 shows a vacuum die casting apparatus according to an embodiment of the present invention. In the figure, 1 is The fixed die 1 is fixed to a fixed holder 3 attached to a fixed platen 2. The fitting surface 1a is fitted and held with the exposed surface. 4 is opposed to the fixed mold 1 The movable die 4 is mounted on a movable platen 5 by an ejector plate. The mold matching surface 4a is exposed on the movable holder 6 attached via the container block 7. It is fitted and held in a state where it is held. The movable mold 4 is fixed by a moving mechanism (not shown). The fixed mold 1 and the movable mold 4 are configured so as to open and close the mold by coming into contact with and separating from the mold 1. A cavity 8 is formed between the fixed mold 1 and the movable mold 4 in the mold closed state. It has become.       [0015]   One end of an injection sleeve 9 is connected to the lower end of the fixed mold 1, Is continuous with the cavity 8 by the runner 10 formed on the mold mating surface 4a of the movable mold 4. ing. A plunger 11 is inserted into the other end of the injection sleeve 9 so as to advance and retreat. The plunger 11 is a plunger rod connected to a shot cylinder (not shown). Is fixed to the tip of the injection sleeve 9 and is in the injection sleeve 9 by the expansion and contraction operation of the shot cylinder. To go back and forth. Although not shown, a hot water supply port of the injection sleeve 9 is provided. The feed pipe is connected to the molten metal holding furnace and is stored in the molten metal holding furnace. A molten metal such as a minium alloy or a magnesium alloy is supplied into the injection sleeve 9 through a supply pipe. The injection operation of the plunger 11 causes the cavity 8 to be injected and filled. ing.       [0016]   The mold mating surface 4a of the movable mold 4 on the side opposite to the runner 10 is also shown in FIG. As described above, three evacuation passages 13 are formed in communication with the cavities 8, respectively. These evacuation passages 13 merge into one and open to the mold mating surface 4 a of the movable mold 4. It is connected to a port 14 a of the first vacuum pipe 14. This first vacuum pipe Reference numeral 14 is connected to a first vacuum pump 15, and a first on-off valve 16 is interposed in the middle of the first vacuum pump 15. ing. Then, the first vacuum pump 15 is closed with the fixed mold 1 and the movable mold 4 closed. And the first opening / closing valve 16 is operated to open the inside of the cavity 8 as desired. Vacuum is applied until the vacuum degree (for example, about 30 Torr or less) is reached. I have.       [0017]   As shown in FIG. 1, a rectangular annular suction groove 17 is provided on the mold matching surface 4 a of the movable mold 4. Correspond to the cavity 8, the runner 10, the injection sleeve 9, and the evacuation passage 13. And the annular suction groove 17 is formed on the mold matching surface 4 a of the movable mold 4. It is connected to the port 18a of the second evacuation pipe 18 which is open. This second vacuum The pulling pipe 18 is connected to a second vacuum pump 19, and a second on-off valve 20 is provided on the way. It is interposed. Then, with the fixed mold 1 and the movable mold 4 in a closed state, the second vacuum pump is closed. The pump 19 is operated and the second on-off valve 20 is opened to open the annular suction groove 17. Evacuate until the desired degree of vacuum (for example, about 80 Torr) is reached. Has become. The evacuation in the annular suction groove 17 is performed by evacuation in the cavity 8. It is performed in parallel.       [0018]   A rectangular annular seal groove 21 is provided on the mold matching surface 6a of the movable holder 6 so as to have the annular suction groove. An annular seal formed around the drawing groove 17 and made of an O-ring made of heat-resistant rubber When the material 22 is in the mold closed state, between the mold matching surfaces 3a, 6a of the fixed holder 3 and the movable holder 6 Is fitted in the annular seal groove 21 so as to seal the seal.       [0019]   A storage chamber 23 is formed in the ejector plate storage block 7, and In the mold 4 and the movable holder 6, a through hole penetrating through the cavity 8 and the accommodation chamber 23 is provided. 24 are formed, and two through holes 24 that advance and retreat with respect to the cavity 8 are formed in the through hole 24. The ejector pin 25 is inserted so as to be able to advance and retreat, and its base end is disposed in the accommodation chamber 23. The ejector plate 26 is fixed to the ejector plate 26. This ejector plate 25 It moves forward and backward by an operating mechanism (not shown). The rate 26 is retracted so that the ejector pin 25 does not project into the cavity 8. After the casting, the ejector plate 26 advances to eject the ejector pin 25 to the cabinet. By protruding the tee 8, the cast product is released from the mold.       [0020]   In the vacuum die casting apparatus configured as above, the molten metal is injected three times after the mold is closed. And the plunger 11 is advanced at a low speed so that the molten metal flows into the cavity 8 at a low speed. Inject with. When the plunger 11 advances and passes a certain position, the first evacuation port The pump 15 is operated and the first on-off valve 16 is opened to open the cavity 8. Is evacuated to about 30 Torr or less. At the same time, the second vacuum pump 19 Is operated, and the second on-off valve 20 is operated to open, so that about 8 Vacuum to 0 Torr.       [0021]   As described above, the degree of vacuum in the cavity 8 is reduced to about 30 Torr or less by casting. This is to make the cast casting a healthy state with almost no casting cavities. By the way, annular suction When only the inside of the cavity 8 is evacuated without the groove 17, the stationary mold 1 and the stationary From a slight gap between the divided surfaces with the die 3 and between the divided surfaces between the movable mold 4 and the movable holder 6. As a result of the experiment, as shown by the broken line in FIG. The degree of vacuum in the bitty 8 is only about 100 Torr.       [0022]   On the other hand, in the present embodiment having the annular suction groove 17, the vacuum When the degree is set to about 80 Torr, the distance between the divided surfaces of the fixed die 1 and the fixed holder 3 or the movable die The outside air that tries to enter through a slight gap between the divided surfaces of the movable holder 4 and the movable holder 6 is annularly sucked. It can be drawn into the drawing groove 17 so as not to enter the cavity 8, As a result, as shown by a solid line in FIG. 3, the degree of vacuum in the cavity 8 was reduced to about 30 Torr. We were able to. By the way, when there is neither the annular suction groove 17 nor the annular sealing material 22, The degree of vacuum in the cavity 8 could only be set to about 150 Torr.       [0023]   When the degree of vacuum in the cavity 8 reaches about 30 Torr as described above, the pressure increases. The runner 11 is advanced at a high speed, and the molten metal is injected and filled into the cavity 8 at a high speed. Cast things. For example, if the casting is made of aluminum alloy In this embodiment, the gas amount in the casting is about 1 cc / 100 g Al, and almost no No high quality and sound casting was obtained, whereas in the comparative example, about 10 cc / 100 gAl and the gas amount were larger than those of the present embodiment, and a sound casting was not obtained.       [0024]   As described above, in the vacuum die casting apparatus according to the present embodiment, almost no In order to obtain a sound casting, the annular suction groove 17 around the cavity 8 allows the outside air This can be achieved by preventing entry into the vitities 8. Also this The annular sealing material 22 is relatively far from the cavity 8 and can be hardly affected by the heat of the molten metal. Since it is provided on the mold mating surface 6a of the moving holder 6, it is difficult to deteriorate due to heat and the sealing performance is improved. It can be secured for a long time. Further, if the molten metal in the cavity 8 is Even if it flows out between the mold mating surface 1a and the mold mating surface 4a of the movable mold 4, the outflow occurs. The molten metal flows into the annular suction groove 17 and does not reach the outer annular sealing material 22. Thus, damage to the annular seal member 22 can be prevented. Therefore, the annular suction groove Even when several hundred shots are continuously cast in a state where the molten metal has flowed into 17, a stable degree of vacuum is maintained. Obtainable.       [0025]     [Effect of the invention]   As described above, according to the present invention, one of the fixed type and the movable type is matched. An annular suction groove is formed on the surface so as to surround the cavity, so the space between the mold The outside air that is about to enter through the kana gap is drawn into the annular suction groove and Can be prevented from entering the cavity, and the cavity is made Almost no high quality and sound castings can be cast. Also, the cavity Ring between the fixed and movable holders, which are far from each other and are not easily affected by the heat of the molten metal. Since the seal groove is provided, the sealing performance can be ensured for a long period of time. In addition, the molten metal flowing out of the cavity between the fixed and movable mold So that it does not reach the annular seal material outside the suction groove. To prevent damage to the annular sealing material and enable continuous casting over a long period of time. A degree of vacuum can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of a movable die side of a vacuum die casting apparatus according to an embodiment as viewed from a mold matching surface side. FIG. 2 is a sectional view of the vacuum die casting apparatus according to the embodiment. FIG. 3 is a graph showing the degree of vacuum of the vacuum die casting apparatus according to the embodiment together with a comparative example. [Description of Signs] 1 Fixed mold 1a Mold matching surface 3 Fixed holder 3a Mold matching surface 4 Movable mold 4a Mold matching surface 6 Movable holder 6a Mold matching surface 8 Cavity 17 Annular suction groove 21 Annular seal groove 22 Annular seal material

Continuation of front page    (72) Inventor Shin Tajiri             Hiroshima Pref.Hiroshima City Asa Minami Ward 3-44-17 17-             8 Hiroshima Aluminum Industry Co., Ltd. (72) Inventor Hiromi Shinkawa             Hiroshima Pref.Hiroshima City Asa Minami Ward 3-44-17 17-             8 Hiroshima Aluminum Industry Co., Ltd. (72) Inventor Masahiro Kawakami             Hiroshima Pref.Hiroshima City Asa Minami Ward 3-44-17 17-             8 Hiroshima Aluminum Industry Co., Ltd.

Claims (1)

[Claim 1] A fixed mold fitted and held in a fixed holder with the mold-matching surface exposed, and a mold-matching surface arranged opposite to the fixed mold and exposed. A vacuum die casting apparatus for casting a casting by vacuuming a cavity formed between the fixed mold and the movable mold in a mold closed state with the movable mold fitted and held in the movable holder in the state, An annular suction groove is formed on one of the fixed-type and movable-type mating surfaces so as to surround the cavity, and an annular seal groove is formed on the one-type matching surface of the fixed holder and the movable holder. A vacuum die-casting device formed so as to surround the groove, wherein the annular seal material is fitted in the annular seal groove so as to seal between the mold-matching surfaces of the fixed holder and the movable holder in a mold-closed state. .