CN201061825Y - Seal structure of die-casting die for high-vacuum pressure diecasting - Google Patents

Abstract

The utility model relates to a sealing structure of a mold for high vacuum pressure casting. A sealing structure of a die-casting mold for high-vacuum pressure casting, the die-casting mold for high-vacuum pressure casting is composed of: a movable mold cover plate (7), a movable mold insert (14), a movable mold backing plate (6), a pad block (4), movable mold bottom plate (1); ejector pin plate (3), ejector pin platen (2), ejector pin (31), fixed mold cover plate (8), fixed mold insert (13), fixed mold Bottom plate (10), sprue sleeve (16), injection chamber (20), punch (18); It is characterized in that: in the fixed mold cover plate (8) that contacts with moving mold cover plate (7) A third sealing groove (22) is provided on one side, and a heat-resistant silicone rubber seal is installed in the third sealing groove (22); on the inner side of the third sealing groove (22) on the fixed mold cover plate (8), a second buffer gas The groove (23), the second buffer gas groove (23) communicates with the second air extraction channel (9), and the second air extraction channel (9) is connected with an external vacuum system. The utility model has the characteristics of high vacuum degree in the mold cavity.

Description

A Sealing Structure of Die Casting Mold for High Vacuum Pressure Casting

technical field

The utility model belongs to the technical field of casting, in particular to a sealing structure of a mold for high vacuum pressure casting.

Background technique

Die casting (referred to as die casting) is a forming process that makes liquid metal fill the mold cavity at a very high speed under high pressure, and cools and solidifies under pressure to obtain a casting. Since the molten metal fills the mold cavity in a high-speed injection state, most of the gas in the cavity is too late to be removed and will inevitably be involved in the molten metal, and finally remain in the casting in the form of pores, resulting in low mechanical properties of the die casting. Deep machining is not possible, and heat treatment and welding are not possible.

The vacuum die casting method is to extract the gas in the cavity, and the molten metal fills the cavity in a vacuum state, so less gas is involved and the mechanical properties of the casting are high. And the vacuum die-casting is the same as the common die-casting method, which is easy to operate and does not reduce production efficiency. One of the key technologies of vacuum die-casting is the sealing of die-casting mold cavity, and the quality of mold sealing directly affects the quality of die-casting parts. At present, the widely used sealing method is to open a sealing groove on the parting surface of the mold, and fill it with heat-resistant silicone rubber and other sealing materials. However, because other parts of the mold are not well and reliably sealed, there are many air leakage places, so the vacuum degree in the obtained mold cavity is low. Although the mechanical properties of the casting after die casting have been improved, it is still impossible to carry out heat treatment and follow-up. welding process.

Contents of the invention

The purpose of the utility model is to provide a sealing structure of a die-casting mold for high-vacuum pressure casting that can make the vacuum degree in the mold cavity high.

In order to achieve the above object, the technical solution of the present utility model is: a sealing structure of a die-casting mold for high vacuum pressure casting. Moving mold backing plate 6, cushion block 4, moving mold bottom plate 1; ejector pin plate 3, ejector pin pressure plate 2, ejector pin 31, fixed mold cover plate 8, fixed mold insert 13, fixed mold bottom plate 10, sprue sleeve 16 , injection chamber 20, punch 18; It is characterized in that:

A third seal groove 22 is provided on one side of the fixed mold cover plate 8 in contact with the movable mold cover plate 7, and a heat-resistant silicone rubber seal is installed in the third seal groove 22; Inside, a second buffer air tank 23 is provided, and the second buffer air tank 23 communicates with the second air extraction channel 9, and the second air extraction channel 9 is connected with the external vacuum system.

A side of the movable mold backing plate 6 close to the movable mold bottom plate 1 is provided with a ejector pin sealing plate 28, and the ejector pin sealing plate 28 is provided with an ejector pin hole, and the ejector pin 31 passes through the ejector pin hole on the ejector pin sealing plate 28, and the ejector pin A fourth sealing groove 26 is provided on the rod sealing plate 28, the fourth sealing groove 26 is located outside the hole of the ejector pin, and the fourth sealing groove 26 is filled with heat-resistant silicone rubber; A heat-resistant silicon rubber sealing ring 30 is installed on the ejector rod 31 , and the ejector rod sealing plate 28 is fixed to the movable mold backing plate 6 by bolts 29 .

A fifth buffer air tank 27 is provided between the ejector pin sealing plate 28 and the movable mold backing plate 6, the fifth buffer air tank 27 is connected with the first air extraction channel 5, the first air extraction channel 5 is connected with the vacuum system, and the fifth buffer air channel 27 is connected to the vacuum system. The groove 27 is located inside the fourth seal groove 26 .

A third buffer air tank 24 is provided between the movable mold backing plate 6 and the movable mold cover plate 7, and the third buffer air tank 24 is connected to the first air extraction channel 5, and the first air extraction channel 5 is connected to the vacuum system.

A first buffer air groove 11 is provided between the fixed mold bottom plate 10 and the fixed mold cover plate 8, and the first buffer air groove 11 is connected to the second air extraction channel 9, and the second air extraction channel 9 is connected to the vacuum system.

An annular second sealing groove 21 is provided at the contact point between the outside of the fixed mold bottom plate 10 and the injection chamber 20 , and the second sealing groove 21 is filled with heat-resistant silicone rubber, which is compressed and sealed by the injection chamber 20 .

Two first sealing grooves 19 are provided on the punch 18, and the first sealing grooves 19 are equipped with heat-resistant silicone rubber.

The sealing structure of the present utility model adopts: an ejector rod sealing plate 28 which can be fixed on the movable die backing plate is added behind the movable mold backing plate of the die-casting mold, and a sealing groove and a buffer air groove are set on the ejector rod sealing plate 28; Sealing grooves are provided between the injection chamber and the bottom plate of the fixed mold, the punch and the inner wall of the injection chamber, and heat-resistant sealing rings are installed in the sealing grooves to prevent gas from entering the cavity; Buffer air grooves are provided between the backing plate and the fixed mold cover plate, between the movable mold cover plate and the fixed mold cover plate, that is, on the inner side of the sealing groove on the parting surface; all buffer air grooves are connected with the exhaust system. When the sealing ring leaks in, it can be sucked away by the buffer air groove, so as not to enter the mold cavity. After the above measures are taken, the vacuum degree in the cavity of the die-casting mold can be made high, meeting the requirements of the high-vacuum die-casting process.

The utility model can be applied to high-vacuum die-casting forming to obtain high-performance die-casting parts that can be heat treated or welded.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1- bottom plate of movable mold, 2- ejector pin plate, 3- ejector pin plate, 4- pad, 5- first air extraction channel, 6- movable mold backing plate, 7- movable mold cover plate, 8- Fixed mold cover plate, 9-second air extraction channel, 10-fixed mold bottom plate, 11-first buffer air tank, 12-cavity, 13-fixed mold insert, 14-movable mold insert, 15-connecting channel , 16-sprue sleeve, 17-gate, 18-punch, 19-first sealing groove, 20-injection chamber, 21-second sealing groove, 22-third sealing groove, 23-second buffer gas Groove, 24-third buffer air groove, 25-fourth buffer air groove, 26-fourth sealing groove, 27-fifth buffer air groove, 28-ram sealing plate, 29-bolt, 30-heat-resistant silicone rubber Sealing ring, 31-thrust.

Detailed ways

As shown in Figure 1, a sealing structure of a die-casting mold for high-vacuum pressure casting,

The die-casting mold for high vacuum pressure casting is composed of: movable mold cover plate 7, movable mold insert 14, movable mold backing plate 6, cushion block 4, movable mold bottom plate 1; Rod 31, fixed mold cover plate 8, fixed mold insert 13, fixed mold bottom plate 10, sprue sleeve 16, injection chamber 20, punch 18; there is a pad between the movable mold bottom plate 1 and the movable mold backing plate 6 Block 4, on the bottom plate 1 of the movable mold on the side of the movable mold backing plate 6, the ejector pin plate 2 and the ejector pin plate 3 are sequentially arranged, one end of the ejector pin 31 is fixedly connected with the ejector pin plate 3, and the other end of the ejector pin 31 is worn through The ejector pin hole on the movable mold backing plate 6 is fixedly connected with the movable mold insert 14; between the movable mold backing plate 6 and the fixed mold bottom plate 10, a movable mold cover plate 7, a fixed mold cover plate 8, and a movable mold cover plate are sequentially arranged. The plate 7 and the fixed mold cover plate 8 are respectively provided with cavities, the movable mold insert 14 is located in the cavity of the movable mold cover plate 7, the fixed mold insert 13 is located in the cavity of the fixed mold cover plate 8, and the movable mold insert 14 is located in the cavity of the fixed mold cover plate 8. A casting cavity 12 is formed between the insert 14 and the fixed mold insert 13; the fixed mold cover plate 8 and the fixed mold bottom plate 10 are provided with a sprue sleeve 16, and the sprue sleeve 16 communicates with the cavity 12 by the connecting channel 15; An injection chamber 20 is installed on the outside of the mold bottom plate 10, and the inside of the injection chamber 20 is a through hole. One end of the injection chamber 20 is provided with a punch 18, and the other end of the injection chamber 20 communicates with the sprue bushing 16. A gate 17 is provided on the chamber 20, and the gate 17 communicates with the through hole of the injection chamber 20;

The metal liquid is poured from the gate 17 on the injection chamber 20, and then the injection punch 18 advances to hydraulically inject the metal into the cavity 12; Cavity forms a closed system, starts vacuuming now (not drawn in the vacuum valve figure, and cavity 12 is vacuumed by vacuum valve), and the gas in the cavity is quickly extracted, and vacuum die-casting is completed. Therefore, in vacuum die casting, in order to ensure that there is no air leakage between the mating surfaces and the moving surfaces, the mold must be sealed. The high vacuum sealing measures taken by the utility model are as follows:

1) A third seal groove 22 is provided on one side of the fixed mold cover plate 8 in contact with the movable mold cover plate 7, and a heat-resistant silicone rubber seal is installed in the third seal groove 22. When the movable mold cover plate 7 and the fixed mold cover plate 8 are close together, the sealing rubber is pressed to play a sealing role.

2) On the inner side of the third sealing groove 22 on the fixed mold cover plate 8, a second buffer gas groove 23 is opened, the second buffer gas groove 23 communicates with the second air extraction channel 9, and the second air extraction channel 9 communicates with the outside world connection to the vacuum system. The effect of the second buffer gas tank 23 is that if any gas leaks in through the third sealing groove 22, it first enters the second buffer gas tank 23. Because the second buffer gas tank 23 is connected with the second air extraction channel 9, the gas The gas is directly sucked away by the second gas extraction channel 9, effectively preventing the gas from entering the mold cavity 12.

3) An ejector pin sealing plate 28 is provided on the side of the movable mold backing plate 6 close to the movable mold bottom plate 1, and an ejector pin hole is provided on the ejector pin sealing plate 28, and the ejector pin 31 passes through the ejector pin on the ejector pin sealing plate 28 hole, the ejector pin sealing plate 28 is provided with a fourth sealing groove 26, the fourth sealing groove 26 is located outside the ejector pin hole, and the fourth sealing groove 26 is filled with heat-resistant silicone rubber; The ejector rod 31 between them is equipped with a heat-resistant silicon rubber sealing ring 30, and the entire ejector rod sealing plate 28 is fixed to the movable mold backing plate 6 by bolts 29, and the heat-resistant silicon rubber sealing ring 30 and the fourth sealing groove 26 are pressed at the same time. Heat-resistant silicone rubber.

4) A fifth buffer air tank 27 is provided between the ejector pin sealing plate 28 and the movable mold backing plate 6, the fifth buffer air tank 27 is connected to the first air extraction channel 5, and the first air extraction channel 5 is connected to the vacuum system. The five buffer air grooves 27 are located inside the fourth sealing groove 26 . The effect of the fifth buffer air tank 27 is the same as that of the second buffer air tank 23 .

5) A third buffer air tank 24 is provided between the movable mold backing plate 6 and the movable mold cover plate 7, the third buffer air tank 24 is connected to the first air extraction channel 5, and the first air extraction channel 5 is connected to the vacuum system. The function of the third buffer air groove 24 is the same as that of the second buffer air groove 23 .

6) Set up a first buffer air tank 11 between the fixed mold bottom plate 10 and the fixed mold cover plate 8, the first buffer air tank 11 is connected to the second air extraction channel 9, and the second air extraction channel 9 is connected to the vacuum system. The function of the first buffer air tank 11 is the same as that of the second buffer air tank 23 .

7) An annular second sealing groove 21 is provided at the contact between the outside of the bottom plate 10 of the fixed mold and the injection chamber 20. The second sealing groove 21 is filled with sealed heat-resistant silicone rubber, which is compressed and sealed by the injection chamber 20, which can prevent the gas from being released from the fixed mold. The gap between the bottom plate 10 and the shot chamber 20 enters the mold cavity.

8) Set up two first sealing grooves 19 on the punch 18, the first sealing groove 19 is covered with heat-resistant silicone rubber, and seal the gap between the injection chamber 20 and the punch 18 when the punch 18 moves to position S2 , to prevent gas from entering the cavity.

Through the above-mentioned sealing measures, the vacuum degree in the mold cavity 12 can be ensured to be high and the fluctuation range is small. During actual operation, the vacuum can be stably maintained between 91KPa-96KPa, that is, the absolute pressure of the gas in the cavity is 5-10KPa, which meets the requirements of high vacuum die-casting.

The above is a detailed description of the embodiments of the utility model, and is not intended to limit the utility model. The scope of the utility model should be based on the scope of the patent claims. The spirit of the patent scope and the embodiments and similar structures that are similar to changes , should be included in the utility model.

Claims (7)

1. high vacuum pressure casting is with the hermetically-sealed construction of compression mod, described high vacuum pressure casting with compression mod by dynamic model cage plate (7), moving die insert (14), dynamic model backing plate (6), cushion block (4), moving clamping plate (1); Push rod plate (3), push rod pressing plate (2), push rod (31), cover half cage plate (8), fixed die insert (13), fixed clamping plate (10), sprue bush (16), injection chamber (20), drift (18) are formed; It is characterized in that:

Offering the 3rd seal groove (22) with the one side of the contacted cover half cage plate of dynamic model cage plate (7) (8), the 3rd seal groove is adorned heat-resisting silicone rubber seal in (22); The inboard of the 3rd seal groove (22) on cover half cage plate (8), offer one second the buffering air drain (23), second the buffering air drain (23) with second bleed (9) communicate, second bleed (9) with the external world vacuum system be connected.

2. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: dynamic model backing plate (6) is provided with push rod sealing plate (28) near a side of moving clamping plate (1), push rod sealing plate (28) is provided with jogger hole, push rod (31) passes the jogger hole on the push rod sealing plate (28), offer the 4th seal groove (26) on the push rod sealing plate (28), the 4th seal groove (26) is positioned at the outside of jogger hole, and the 4th seal groove is adorned heat-resisting silicon rubber in (26); On the push rod (31) between push rod sealing plate (28) and the dynamic model backing plate (6) heat-resisting silicone rubber O-ring (30) is housed, push rod sealing plate (28) is fixed in dynamic model backing plate (6) by nut (29).

3. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: offer the 5th buffering air drain (27) between push rod sealing plate (28) and the dynamic model backing plate (6), the 5th the buffering air drain (27) and first bleed (5) be connected, first bleed (5) connect vacuum system, the 5th buffering air drain (27) is positioned at the inboard of the 4th seal groove (26).

4. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: offer the 3rd buffering air drain (24) between dynamic model backing plate (6) and the dynamic model cage plate (7), the 3rd buffering air drain (24) connects first bleeds (5), first bleed (5) connect vacuum system.

5. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: offer the first buffering air drain (11) between fixed clamping plate (10) and the cover half cage plate (8), the first buffering air drain (11) connects second bleeds (9), second bleed (9) connect vacuum system.

6. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: annular second seal groove (21) is offered with injection chamber (20) contact position in fixed clamping plate (10) outside, the heat-resisting silicon rubber of dress sealing compresses sealing by injection chamber (20) in second seal groove (21).

7. a kind of high vacuum pressure casting according to claim 1 hermetically-sealed construction of compression mod, it is characterized in that: offer 2 roads, first seal grooves (19) on the drift (18), first seal groove is adorned heat-resisting silicon rubber in (19).

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