KR102398059B1 - High vacuum die casting mold - Google Patents

Abstract

The present invention relates to a high-vacuum die-casting mold, and in particular, to a high-vacuum die-casting mold that allows moisture flowing into the mold to be smoothly discharged during manufacturing of a die-cast casting, thereby preventing casting defects due to moisture and achieving quality improvement. it's about
The high vacuum die-casting mold according to the present invention includes a fixed mold, and a movable mold that is reciprocally moved to be molded or spaced apart from the stationary mold to form a cavity when molded with the stationary mold, and the fixed mold and the movable mold When this is molded, a sealing part formed on one or both sides of the fixed or movable mold to block the inflow of air from the outside, and moisture remains in either or both of the fixed or movable mold and a moisture drain hole formed so that the moisture can be discharged by its own weight in a region of A sealing member is disposed around the lower end, and the sealing member blocks the inflow of external air from the moisture drain hole when the fixed mold and the movable mold are combined.

Description

High vacuum die casting mold {High vacuum die casting mold}

The present invention relates to a high-vacuum die-casting mold, and in particular, to a high-vacuum die-casting mold that allows moisture flowing into the mold to be smoothly discharged during manufacturing of a die-cast casting, thereby preventing casting defects due to moisture and achieving quality improvement. it's about

As one method of manufacturing metal parts, molten metal such as an alloy such as zinc, aluminum, tin, copper, magnesium, etc. is injected (press-fitted) into a steel mold machined to match the required casting shape, and the cavity shape of the mold and Die casting, which is a precision casting method for obtaining identical castings, is known.

Die casting is mainly used in the manufacture of automobile parts because of its high machine automation rate, high precision and mass production, but it is also widely used in the manufacture of electrical equipment, optical equipment, vehicles, weaving equipment, construction equipment, and measuring equipment parts.

On the other hand, in the process of filling the molten metal into the cavity formed inside the fixed mold and the movable mold, the gas (gas formed by thermal decomposition of air or a mold release agent, etc.) or the gas injected into the cavity together with the molten metal is discharged to the outside. It can be mixed into the molten metal without being discharged, resulting in defects such as voids or pin holes in the cast product, which is a major cause of lowering the strength of the cast product.

In order to prevent the above defects, a device for preventing gas flowing into the cavity together with the gas or the molten metal present in the cavity from mixing into the molten metal during the die casting process is required.

According to this necessity, when the stationary mold and the movable mold are molded, the cavity, which is a space where the product formed by the stationary mold and the movable mold is molded, is sealed, and at the same time, a vacuum pump is connected to one side of the cavity and the gas present in the cavity A high-vacuum die-casting mold is used so that it can be discharged to the outside.

For example, Korean Patent Laid-Open Publication No. 10-2009-0126224 discloses a configuration in which gases such as air and gas are discharged through a first air discharge passage, a second air discharge passage, and an air discharge pipe formed on the upper side of a mold. However, in the case of this structure, moisture flowing into the parting line of the mold and cavity formed in a gap or divided between the mill pins of the movable mold is easily discharged through the air discharge passage, unlike gases such as air or gas. Therefore, there is a problem in that the mold is discharged into the cavity due to pressure during molding and injection, which affects the molten metal in the solidification process, thereby damaging the soundness of the casting.

On the other hand, in Patent Publication No. 10-2016-0085628, a discharge port for discharging liquids such as a mold release agent or moisture that flows into the sealed space inside the sealed body from the cavity side to the outside of the sealed space, and for opening and closing the outlet A mold equipped with a valve is presented, and this structure can discharge moisture accumulated in the mold to the outside to some extent, but there is a problem in that it is difficult to discharge even moisture flowing into the parting line of the mold and cavity.

Republic of Korea Patent Publication No. 2011-0103743 (2011. 9. 21) Republic of Korea Patent Publication No. 2010-0117260 (2010. 11. 3)

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to easily discharge moisture introduced into the mold gap of the die-casting mold and the parting line while maintaining the vacuum during the solidification process to the outside. To provide a high-vacuum die-casting mold that can improve quality by preventing casting defects caused by moisture flowing into the part.

In order to achieve the above object, a first embodiment of the present invention includes a stationary mold, and a movable mold which is arranged reciprocally so as to be molded or spaced apart from the stationary mold to form a cavity when molded with the stationary mold; , a sealing part formed on one or both sides of the fixed or movable mold to block the inflow of air from the outside when the fixed mold and the movable mold are combined, and either one of the fixed or movable mold or It includes a moisture drain hole formed so that the moisture can be discharged by its own weight in an area where moisture remains inside of both sides, and the lower end of the moisture drain hole is on the opposite side when the fixed mold or the movable mold is combined is formed, and a sealing member is disposed around the lower end of the water drain hole, so that the inflow of external air from the water drain hole is blocked by the sealing member when the fixed mold and the movable mold are combined. , provides die-casting high-vacuum molds.

In order to achieve the above object, a second embodiment of the present invention includes a stationary mold, and a movable mold that is reciprocally disposed to be molded or spaced apart from the stationary mold to form a cavity when molded with the stationary mold; , a sealing part formed on one or both sides of the fixed or movable mold to block the inflow of air from the outside when the fixed mold and the movable mold are combined, and either one of the fixed or movable mold or A moisture drain hole formed so that the moisture can be discharged by its own weight in a region where moisture remains inside of both sides, and the drain hole is opened when the movable mold is opened and an opening/closing means for closing the drain hole so that the vacuum state of To provide a high vacuum die-casting mold comprising a rod reciprocating inside the mounting hole, an elastic body supporting the rod, and a sealing member formed around the lower end of the moisture drain hole and outside the mounting hole.

In order to achieve the above object, a third embodiment of the present invention includes a stationary mold, and a movable mold that is reciprocally moved to be molded or spaced apart from the stationary mold to form a cavity when molded with the stationary mold; , a sealing part formed on one or both sides of the fixed or movable mold to block the inflow of air from the outside when the fixed mold and the movable mold are combined, and either one of the fixed or movable mold or A moisture drain hole formed so that the moisture can be discharged by its own weight in a region where moisture remains inside of both sides, and the drain hole is opened when the movable mold is opened an opening/closing means for closing the drain hole so that the vacuum state of , provides high vacuum die casting molds.

In the first to third embodiments of the present invention, the upper end of the water drain hole is formed to communicate with the parting line on the bottom of the part forming the cavity of the fixed or movable mold, and the lower end is in the lower part of the fixed or movable mold. It may be formed to communicate with the side surface, or may be formed to communicate with the lower bottom surface.

In the first embodiment of the present invention, the sealing member may be an O-ring formed along the periphery of the lower end of the water drain hole, which is formed on the fixed or movable mold side.

In the second embodiment of the present invention, a key is formed on the rod, a key groove into which the key is inserted is formed on one side of the mounting hole along the longitudinal direction, and a support wall is formed on one side of the mounting hole. can

According to the high vacuum mold according to the present invention, moisture flowing into the mold gap of the die-casting mold and the parting line can be easily discharged to the outside, thereby preventing casting defects caused by the moisture flowing into the part and improving the quality of the casting can achieve

1 is a view schematically showing a high-vacuum die-casting mold according to a first embodiment for forming the die-casting equipment of the present invention.
2 is a view schematically showing a state in which the water drain hole is closed when the die-casting is manufactured by combining the movable mold and the fixed mold of the high-vacuum die-casting mold according to the first embodiment of the present invention.
3 is a view schematically showing a state in which a water drain hole is opened and moisture is discharged to the outside when the fixed mold and the movable mold according to the first embodiment of the present invention are opened.
4 is a view showing the opening and closing means of the high vacuum die-casting mold according to the second embodiment forming the die-casting equipment of the present invention separated.
FIG. 5 is a view of an assembled state of the opening/closing means of FIG. 4 .
6 is a view schematically showing a state in which the opening/closing means moves to the right (forward) to close the water drain hole when the fixed mold and the movable mold are combined according to the second embodiment of the present invention.
7 is a view schematically showing a state in which the molten metal is supplied to the sleeve of the die casting facility according to the second embodiment of the present invention.
8 is a view schematically showing a state in which molten metal is injected into the cavities of the stationary mold and the movable mold according to the second embodiment of the present invention.
9 is a view showing that when the die-casting is separated by opening the fixed mold and the movable mold according to the second embodiment of the present invention, the opening/closing means moves to the left by the elastic means to open the moisture drain hole and discharge moisture to the outside. It is a diagram schematically showing the state.
10 is a view schematically showing the configuration of a high vacuum die-casting mold according to a third embodiment of the present invention.
11 is a view schematically showing a state in which the opening/closing means according to the third embodiment of the present invention is raised and closed the water drain hole during die-casting by combining a fixed mold and a movable mold.
12 is a view schematically showing a state in which the opening/closing means according to the third embodiment of the present invention descends when the fixed mold and the movable mold are opened to open a moisture drain hole and discharge moisture to the outside.

Hereinafter, a preferred embodiment according to the present invention will be described in more detail based on the accompanying drawings.

Here, in all the drawings below, components having the same function are omitted by using the same reference numerals, and repeated descriptions are omitted, and the terms to be described below are defined in consideration of the functions in the present invention, which have their own and commonly used meanings. should be interpreted as

[Example 1]

1 to 3, the high vacuum die-casting mold according to Example 1 of the present invention will be described as follows.

The die casting mold according to the present invention is mounted on a stationary mold die 110 and has a fixed mold 111 having a cavity 111a therein, and a movable mold die 120 facing the stationary mold die 110. A movable mold 121 mounted and having a cavity 121a therein, a sleeve 130 for molten metal injection installed through one side of the fixed mold 111, and molten metal supplied to the sleeve 130 and a molten metal pressurizing means 140 for injection into the cavities 111a and 121a of the stationary mold 111 and the movable mold 121 . In addition, a moving means 122 for moving the movable mold 121 forward and backward is formed in the center of one side of the movable mold die 120 . In addition, on one side of the movable mold die 120, the movable mold 121 has a plurality of push pins for pushing the die-casting which is an injection product from the movable mold 121 during the mold opening operation from the fixed mold 111 ( 123) is formed. In addition, the molten metal pressurizing means 140 and the moving means 122 are composed of cylinders 141 and 122a and plungers 142 and 122b, and by hydraulic pressure, a plunger 142, ( 122b) is formed as an oil hydraulic cylinder to perform mechanical work by reciprocating linear motion.

Specifically, the high vacuum die-casting mold according to the present invention, such as a gap or a parting line of the fixed mold 111 in which a sealing part 111b is formed on one side to block the inflow of external air, is an area where moisture is introduced and remains. A moisture drain hole 112 is formed downward in order to discharge the moisture of the water by its own weight, and the lower end of the moisture drain hole 112 is opposite when the fixed mold 111 or the movable mold 121 is molded together. The sealing member (S) is disposed around the lower end of the water drain hole (112), and when the fixed mold (111) and the movable mold (121) are combined, the sealing member (S) Thus, it is possible to block the inflow of external air from the moisture drain hole 112 .

On the other hand, in Embodiment 1 of the present invention, an example of installing the water drain hole 112 on the fixed mold 111 side is presented, but in the present invention, if necessary, the water drain hole 112 is also provided on the movable mold 121 side. It should be understood to include those that can be installed.

More specifically, as shown in FIG. 1, the water drain hole 112 has an upper end of a fixed mold ( 111) or a part of the movable mold 121 forming the cavities 111a, 121a is formed to communicate with the bottom parting line (Parting Line), and the lower end of the movable mold 121 is opposite to the fixed mold ( 111) is preferably inclined to communicate with the lower inner surface.

In addition, an installation groove for installing a sealing member (S) such as an O-ring in an annular shape is formed on the outer periphery of the water drain hole 112 . Accordingly, when the movable mold 121 is molded, the molded surface of the movable mold 121 is in contact with the sealing member S, and external air is discharged through the moisture drain hole 112 by the vacuum negative pressure. It can prevent inflow into the mold.

The operation process of the high vacuum mold according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3 as follows.

As shown in FIG. 2 , the movable mold die 120 and the movable mold 121 are advanced by an extension operation of the plunger 122b of the moving means 122 to be combined with the stationary mold 111 .

At this time, as the fixed mold 111 and the movable mold 121 are molded together, the moisture drain hole 112 is closed.

In addition, since the sealing member S formed on the outer periphery of the moisture drain hole 112 and the movable mold 121 are in contact with each other, it is possible to prevent external air from flowing through the moisture drain hole 112 .

Next, the molten metal is injected into the cavities 111a and 121a formed by the combination of the fixed mold 111 and the movable mold 121 .

That is, the molten metal is supplied to the sleeve 130 installed on one side of the fixed mold 111 , and the plunger 142 , which is the molten metal pressurizing means 140 , is extended (forwarded) to pressurize the molten metal, thereby supplying the sleeve 130. The molten metal is injected into the internal cavities 111a and 121a of the fixed mold 111 and the movable mold 121 .

Next, when the molten metal injected into the cavities 111a and 121 is solidified, as shown in FIG. 3 , the plunger 122b of the moving means 122 is contracted to form a movable mold die 120 and The movable mold 121 is retreated to the rear to open the mold from the fixed mold 111 to separate the molded die-casting.

At this time, the moisture flowing into the moisture drain hole 112 by the mold opening operation of the mold is discharged to the outside.

As such, the high vacuum die casting mold according to Example 1 of the present invention allows moisture to be discharged to the outside every casting operation, so that moisture does not remain in the gap or parting line of the die casting mold, can prevent the occurrence of quality defects.

In addition, the high vacuum die-casting mold according to Example 1 is linked to the mold opening or mixing operation of the movable mold 121 without installing a separate hydraulic line to mechanically open the moisture drain hole 112, and the moisture drain Even when the hole 112 is closed, the sealing is made so that external air does not flow into the mold, which is preferable to reduce the manufacturing and maintenance cost of the mold.

[Example 2]

4 to 9, the high vacuum die-casting mold according to Example 2 of the present invention will be described as follows.

That is, as shown in FIGS. 4 and 5 , in the second embodiment of the present invention, the stationary mold 111 and the stationary mold 111 are arranged to be reciprocally moved to fit or spaced apart from the stationary mold 111 , the stationary mold In order to block the inflow of air from the outside when the movable mold 121 forming the cavities 111a and 121a when molded with 111, and the fixed mold 111 and the movable mold 121 are molded together A sealing part 111b formed on one or both sides of the stationary mold 111 or the movable mold 121, and moisture in one or both of the stationary mold 111 or the movable mold 121 A moisture drain hole 112 formed so that the moisture can be discharged by its own weight in this remaining region, and the drain hole 112 is opened when the movable mold 121 is opened. and an opening/closing means 114 for closing the drain hole 112 so that a predetermined vacuum state can be maintained in the cavities 111a and 121a, and the opening/closing means 114 includes the water drain hole ( The mounting hole 113 intersecting with the 112 and the opening and closing means 114 include a rod 114a that reciprocates inside the mounting hole 113 in association with the mold opening and molding operation of the mold, and the rod ( It includes an elastic body 114b for supporting 114a), and a sealing member S formed around the lower end of the water drain hole 112 and outside the mounting hole 113 .

Here, in a direction orthogonal to the moisture drain hole 112 , a mounting hole 113 in which an opening and closing means 114 is installed is formed so as to open and close the moisture drain hole 112 in conjunction with the mold opening and molding operation of the mold. do.

In addition, a key groove 113a is formed along the longitudinal direction on one side of the mounting hole 113 , and a support wall 113b is formed on one end side of the mounting hole 113 .

The opening/closing means 114 includes a rod 114a installed through the mounting hole 113 and reciprocating inside the mounting hole 113 in association with the mold opening and molding operation of the mold, and the rod 114a. It is composed of an elastic body (114b) such as a spring for supporting.

On the other hand, a through hole (H) that can communicate with the moisture drain hole 112 is formed in the body of the rod 114a when it is moved to the left by the elastic body 114b, and the rod 114a A protrusion key (K) for stably reciprocating sliding movement inside the mounting hole 113 without rotating is formed.

Specifically, the through hole H of the rod 114a communicates with the moisture drain hole 112 when the rod 114a moves to the left by the elastic force of the elastic body 1142b during the mold opening operation. The moisture remaining inside the fixed mold 111 can be discharged by its own weight.

Conversely, during the combined operation of the movable mold 121 , one end is pressed by the movable mold 121 to move to the right, and the through hole H is in a state that does not communicate with the moisture drain hole 112 , The drain hole 112 is closed.

In addition, an installation groove for installing a sealing member S such as an O-ring in an annular shape is formed on the outer periphery of the moisture drain hole 112 and the mounting hole 113 . Accordingly, when the movable mold 121 is molded, the molded surface of the movable mold 121 comes into contact with the sealing member S, and the moisture drain hole 112 and the mounting hole 113 by vacuum negative pressure. This prevents outside air from flowing into the mold.

The operation process of the high vacuum mold according to the second embodiment of the present invention will be described with reference to FIGS. 6 to 9 as follows.

As shown in FIG. 6 , the movable mold die 120 and the movable mold 121 are advanced by an extension operation of the plunger 122b of the moving means 122 to be combined with the stationary mold 111 .

At this time, the inner surface of the movable mold 121 presses one end of the rod 114a which is the opening/closing means 114 . In conjunction with this, one end of the rod 114a installed in the mounting hole 113 is pressed by the mold to overcome the elastic support force of the elastic body 114b and move to the right, and the through hole H and the moisture drain hole 112 ) are displaced from each other, so the water drain hole 112 is closed by the rod 114a.

In addition, since the movable mold 121 is in contact with the sealing member S formed on the outer periphery of the moisture drain hole 112 and the mounting hole 113 , the inflow of external air is prevented by the mounting hole 113 . can

Next, the molten metal is injected into the cavities 111a and 121a formed by the combination of the fixed mold 111 and the movable mold 121 .

As shown in FIG. 7, molten metal is supplied to the sleeve 130 installed on one side of the fixed mold 111, and as shown in FIG. 8, the plunger 142, which is the molten metal pressing means 140, is extended ( advance) to pressurize the molten metal so that the molten metal supplied to the sleeve 130 is injected into the internal cavities 111a and 121a of the stationary mold 111 and the movable mold 121 .

Next, when the molten metal injected into the cavities 111a and 121 is solidified, as shown in FIG. 9 , the plunger 122b of the moving means 122 is contracted to form a movable mold die 120 and The movable mold 121 is retreated to the rear to open the mold from the stationary mold 111, and the molded die-casting is separated.

At this time, the rod 114a is moved to the left by the elastic restoring force of the elastic body 114b pressed through the support wall 113b of the mounting hole 113 during the mold opening operation of the mold, and the moisture drains. The hole 112 and the through hole H of the rod 114a communicate with each other. Accordingly, the moisture flowing into the moisture drain hole 112 is discharged to the outside through the through hole H of the rod 114a.

In this way, the high vacuum die casting mold according to Example 2 of the present invention allows moisture to be discharged to the outside for every casting operation, so that moisture does not remain in the gap or parting line of the die casting mold, can prevent the occurrence of quality defects.

[Example 3]

10 is a view showing a high vacuum die-casting mold according to Example 3 of the present invention.

That is, as shown in FIG. 10 , the third embodiment of the present invention has a fixed mold 111 and a reciprocating movement arranged so as to be combined with or spaced apart from the fixed mold 111 , the fixed mold 111 . In order to block the inflow of air from the outside when the movable mold 121 forming the cavities 111a and 121a is combined with the fixed mold 121 and the fixed mold 111 and the movable mold 121 are combined with the fixed mold (111) or a sealing part (111b) formed on one or both sides of the movable mold 121, and the fixed mold 111 or the movable mold 121. A moisture drain hole 115 formed in the region so that the moisture can be discharged by its own weight, the drain hole 115 is opened when the movable mold 121 is opened, and the cavity ( and an opening/closing means 116 for closing the drain hole 115 so that a predetermined vacuum state can be maintained in the 111a and 121a, and the opening/closing means 116 includes the moisture drain hole 115 It includes a plunger 116b that moves inside, and a hydraulic cylinder 116a that moves the plunger 116b.

In addition, the upper end of the water drain hole 115 is formed to communicate with the parting line at the bottom of the part forming the cavities 111a and 121a of the fixed mold 111 or the movable mold 121, and the lower end Silver is formed to communicate with the lower bottom surface of the fixed mold 111 or the movable mold 121 .

In addition, the opening/closing means 116 of the water drain hole 115 includes a plunger 116b capable of opening and closing the water drain hole 115 and a hydraulic cylinder 116a driving the plunger 116b. The hydraulic line of the hydraulic cylinder 116a may be used by branching the hydraulic line for operating the molten metal injection means and the like.

On the other hand, in FIG. 10, an example in which the plunger 116b of the hydraulic cylinder 116a is vertically positioned to open and close the lower end of the water drain hole 115 is presented. does not

The operation process of the high vacuum mold according to the third embodiment of the present invention will be described with reference to FIGS. 11 and 12 as follows.

As shown in FIG. 11 , when the fixed mold 111 and the movable mold 121 are combined, the plunger 116b is controlled by a separate hydraulic control unit (not shown) to extend. Through this, by closing the lower end of the water drain hole 115, which was opened as the plunger 116b is extended, the inside of the mold is prevented from flowing in, such as external air, and airtightness is maintained.

Next, molten metal is injected into the cavities 111a and 121a and solidified to manufacture a die-casting casting.

Next, as shown in FIG. 12 , during the mold opening operation of the fixed mold 111 and the movable mold 121 , the plunger 116b is controlled by a separate hydraulic control unit (not shown) to contract. Through this, the lower end of the water drain hole 115 closed by the plunger 116b is opened, and the water introduced along the gap and the parting line of the fixed mold 111 passes through the lower end of the water drain hole 115 . is emitted

On the other hand, although not shown, when a sealing member is installed around the moisture drain hole 115 so that airtightness is maintained by the sealing member when the plunger 116b is pressed, it may be preferable to maintain the degree of vacuum in the mold. there is.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes to other equivalent embodiments are possible without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains.

110: fixed die die 111: fixed die
111a: cavity 112: moisture drain hole
113: mounting hole 113a: key groove
113b: support wall 114: opening and closing means
114a: rod 114b: elastic body
115: moisture drain hole 116: opening and closing means
116a: cylinder 116b: plunger
120: movable die die 121: movable mold
121a: cavity 122: means of movement
122a: cylinder 122b: plunger
130: sleeve 140: molten metal pressurizing means
141: cylinder 142: plunger
H : Through hole K : Keyway
S : sealing member

Claims (6)

delete fixed mold,
A movable mold which is arranged to be reciprocally moved so as to be combined with or spaced apart from the stationary mold to form a cavity when combined with the stationary mold;
A sealing part formed on one or both sides of the stationary mold or the movable mold to block the inflow of air from the outside when the fixed mold and the movable mold are combined;
In order for the moisture to be discharged by its own weight to the region where moisture remains in one or both of the fixed or movable molds, the upper end is connected to the region where the moisture remains and the lower end of the fixed or movable mold is A moisture drain hole formed on the opposite surface during bonding, and
and opening and closing means for opening the moisture drain hole when the movable mold is opened, and closing the moisture drain hole so that a predetermined vacuum state can be maintained in the cavity when the mold is molded;
The opening/closing means includes a mounting hole intersecting the moisture drain hole, the opening/closing means includes a rod reciprocating inside the mounting hole in association with the mold opening and molding operation of the mold, and an elastic body supporting the rod; and a sealing member formed around the lower end of the water drain hole and on the outside of the mounting hole,
In the body of the rod, it moves by the elastic force of the elastic body during the mold opening operation of the mold and communicates with the moisture drain hole so that the moisture remaining inside the fixed mold can be discharged by its own weight, A high vacuum die-casting mold comprising a through hole for closing the moisture drain hole by moving by pressurization of the movable mold during the mixing operation to become in a state of not communicating with the moisture drain hole.
delete 3. The method of claim 2,
The upper end of the moisture drain hole is formed to communicate with the lower parting line of the part forming the cavity of the fixed or movable mold, and the lower end is formed to communicate with the lower inner surface of the fixed or movable mold, or to communicate with the lower lower surface A high vacuum die-casting mold, characterized in that it is formed.
3. The method of claim 2,
The sealing member is formed on the side of the fixed or movable mold, characterized in that the O-ring is formed along the periphery of the lower end of the water drain hole, high vacuum die-casting mold.
3. The method of claim 2,
A key is formed on the rod, a key groove into which the key is inserted is formed on one side of the mounting hole in a longitudinal direction, and a support wall is formed on one end of the mounting hole.

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