JP3432181B2 - Casting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for casting a die using a molten zinc alloy or aluminum alloy.
ZoSo on location.

[0002]

2. Description of the Related Art Generally, a work for obtaining a desired cast product by injecting a molten metal into a cavity of a mold made of foundry sand or the like and cooling and solidifying the molten metal is widely performed.

In this type of casting operation, various measures have been taken in order to obtain a high quality cast product. For example, in Japanese Examined Patent Publication No. 7-224, the pouring of the molten metal into the mold simultaneously actuates the suction means, and the supply means causes the cooling gas body to pass through a large number of ejection pipes and the tip of each ejection pipe. There is disclosed a casting cooling method in which the temperature of the molten metal is absorbed by the cooling gas body to be cooled by being directly injected from the side between the molding sands in the mold.

[0004]

However, in the above prior art, since the cooling gas body is directly injected into the mold, the cooling gas body absorbs the heat of the metal bath, but the metal bath Cannot be cooled quickly. As a result, the cooling time of the molten metal becomes relatively long, and the quality of the die itself, which is a cast product, deteriorates. Therefore, when the cast mold is used as, for example, a mold for resin molding, pinholes are easily generated on the molding surface (molding surface) obtained by processing the surface of the mold, and resin molding is performed. It has been pointed out that by faithfully reproducing the resin molding surface of the mold on the surface, the surface quality of the resin molded product deteriorates and the strength of the mold itself also decreases.

The present invention is intended to solve this type of problem. It is possible to cool the molten metal rapidly to perform the mold manufacturing process in a short time and to maintain the surface of the mold in high quality. an object of the present invention is to provide a ZoSo location cast.

[0006]

In ZoSo location cast according to the present invention According to an aspect of the metallic member having a cooling passage inside, after being placed as a surface mold to the cavity surface of the mold created by the molding sand or the like A molten zinc alloy or an aluminum alloy is poured into the cavity, and a cooling medium is supplied to the cooling passage. Therefore, the molten metal poured into the cavity is brought into direct contact with the metal mold member to be cooled, and is also cooled via the cooling medium supplied to the cooling passage provided inside the metal mold member. To be done.

Therefore, the cooling time of the molten metal is shortened all at once, the manufacturing process of the mold is effectively shortened, and the mold can be efficiently obtained. Moreover, since the surface of the mold is rapidly cooled, the surface of the mold and its periphery are densified. This makes it possible to obtain a high-quality molded product without generating pinholes on the molding surface of the mold and to improve the hardness of the mold itself.

Here, the mold is a resin molding mold, and the entire molding surface of the mold is formed by the surface of the metal mold member. Therefore, a pinhole is not generated on the molding surface, and a high quality resin molded product can be surely molded.

Further, when the mold taken out from the mold cavity is cooled, the mold is held under pressure to prevent the mold from being distorted. Therefore, it becomes possible to reliably cast a high-quality mold.

Further, the metal mold member is provided with a plurality of cooling passages, and the intervals between the cooling passages corresponding to the corners or the vertical portions of the metal mold member are different from each other. It is set to be narrower than the interval between the cooling passages corresponding to the horizontal flat portion. As a result, it is possible to effectively prevent pinholes from being generated in the corners or the vertical wall of the die to be cast.

Further, the metal mold member is divided into a plurality of pieces, and particularly when casting a large mold, the work of setting the metal mold member in the mold and the work of separating the metal mold member from the mold. Is easily accomplished.

[0012]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION is a schematic exploded perspective view of the forming device 10 engages Ru cast to a first embodiment of the present invention.

The casting apparatus 10 includes a mold 12 and the mold 1.
The second cavity surface 14 is provided with a plurality of metal mold members 16a to 16d arranged as a surface mold. Mold 12
Includes a plurality of iron frames 18 stacked in multiple stages, and a plurality of notches 20 are formed in the predetermined iron frame 18. In the iron frame 18, the foam model 22 is the molding sand 24.
Is buried via.

The foam model 22 is made of styrofoam, and has the cavity surface 14 corresponding to the molding surface of the mold formed by NC processing. The cavity surface 14 corresponds to the bumper shape that constitutes the automobile body in the first embodiment. This foam model 2
Reference numeral 2 constitutes a cavity for casting a resin molding die, which will be described later, and the spout model 22 is integrally provided with a spout-shaped portion 25.

As shown in FIGS. 2 and 3, the metal mold members 16a to 16d are made of an aluminum alloy or a copper alloy, and the surface portions 26a to 26d are arranged on the cavity surface 14 and are cast. The entire molding surface of. The metal mold members 16a and 16d correspond to the curved portions of the bumper, which is a resin molded product, and the metal mold members 16b and 16d
16c corresponds to the horizontal flat portion of this bumper.

On the back side of the metal mold members 16a to 16d,
A plurality of air pipes 28a to 28d are fixed to each other, and a cooling passage 30 is provided in each of the air pipes 28a to 28d.
a to 30d are formed (see FIG. 4). Air line 28a
28d are curved on the back surface side of the metal mold members 16a to 16d, and the supply pipe 31a and the discharge pipe 31b are connected to both ends of each. The supply pipe 31a is the mold 1
2 is supported by the mold 12 through the cutout portion 20 of the iron frame 18 and a cooling medium, for example, cold air is passed through each passage 3
It can be connected to the cold air supply means 32 for circulating in 0a to 30d. The discharge pipe 31b is open to the atmosphere or can communicate with a suction source (not shown).

As shown in FIG. 3, metal mold members 16a-1.
In 6d, the distance H1 between the passages 30a and 30d provided corresponding to the corners or the vertical portions is set to be narrower than the distance H2 between the passages 30b and 30c provided corresponding to the horizontal flat portions. Iron plates 34a to 34c are interposed between the metal mold members 16a to 16d, and the metal mold members 16a to 16d have a plurality of predetermined positions corresponding to the surface portions 26a to 26d and the passages 30a to 30d. Temperature sensors 36a to 36d are provided (see FIGS. 1 and 2).

[0018]

EFFECTS OF THE INVENTION In the first embodiment configured as described above,
The operation of the casting apparatus 10 according, described below.

First, a foamed model 22 having a cavity surface 14 of a predetermined shape is created by performing NC processing using styrofoam. This foam model 22
After being placed in the iron frame 18 forming the mold 12, the molding sand 24 is supplied between the foam model 22 and the iron frame 18. Next, the metal mold members 16a to 16d are placed on the foamed model 22 with the respective surface portions 26a to 26d in contact with the cavity surface 14, and an insert plate is provided between the metal mold members 16a to 16d. Some iron plates 34a to 34c are interposed.

Therefore, as shown in FIG. 5, the metal mold member 1
Air pipes 28a to 28d fixed to 6a to 16d
The supply pipe 31a and the discharge pipe 31b are connected to each other, and the supply pipe 31a and the discharge pipe 31b are taken out from the notch 20 of the predetermined iron frame 18. Furthermore, FIG.
As shown in FIG. 4, after the foaming model 22 and the metal mold members 16a to 16d are embedded in the mold 12 and the molding sand 24 is sand-filled thereinto, nitrogen gas or carbon dioxide gas is caused to flow into the molding sand 24 to make the molding sand 24. Cure 24.

Next, as shown in FIG. 7, the mold 12 is inverted and the foam model 22 is removed. This foam model 22
Is easily taken out from the mold 12 by hand by heating with a burner or the like (see FIG. 8). By taking out the sprue shape part 25 together with the foam model 22, a cavity 40 and a sprue part 42 communicating with the cavity 40 are formed in the mold 12.

In the cavity 40, the metal mold members 16a ...
The surface portions 26a to 26d of 16d constitute a mold molding surface, and a mold release agent is applied to the inner wall surface of the cavity 40 including the surface portions 26a to 26d. After the release agent is dried, the molten metal (molten metal) 44 using the zinc alloy or the aluminum alloy is injected from the spout 42 while the metal mold members 16a to 16d are heated (see FIGS. 9 and 10). . An iron net 45 is arranged in the sprue part 42.

In the first embodiment, this molten metal uses the Zamak "Zamak" for casting a resin molding die. This is a zinc alloy obtained by adding a small amount of Mg to the Zn-Al-Cu system, and has the advantages of being inexpensive, easy to cast, and easier to process than an aluminum alloy. This zinc alloy has a temperature of 3 to change from a solid phase to a liquid phase.
80 ° C., and in the aluminum alloy or the copper alloy forming the metal mold members 16 a to 16 d, the temperature at which the solid phase changes to the liquid phase is 700 ° C. for aluminum and 1064 ° C. for copper
And change to a liquid phase at a temperature higher than that of the zinc alloy.

By the way, from the sprue part 42 to the cavity 40
When the molten metal 44 is poured into the chamber, the passage 30a is provided from the cold air supply means 32 via the supply pipe 31a and the air pipes 28a to 28d.
Cold air is introduced to ˜30d and is discharged from the discharge pipe 31b. Therefore, the molten metal 44 in the cavity 40 is rapidly cooled from the portions in contact with the metal mold members 16a to 16d,
The molten metal 44 is hardened to obtain a mold 46. During this time,
The molten metal 44 is repeatedly pushed into the cavity 40.

After the molten metal 44 is cooled to obtain a mold 46, as shown in FIG. 11, the mold 46 is removed from the mold 12, and the metal mold members 16a ...
16d is removed. At that time, the metal mold members 16a to 1
Iron plates 34a to 34c are interposed between 6d, and the work of removing the metal mold members 16a to 16d can be easily performed. After the metal mold members 16a to 16d are removed from the mold 46, the iron plates 34a to 34c are removed from the mold 46.

As shown in FIG. 12, the mold 46 is transferred to a press machine 50, and is left for a predetermined time while being pressurized by the press machine 50. This press machine 50 is provided with a fixing plate 56 whose height position is adjustable with respect to a base 52 via a guide bar 54, and a mold 46 is arranged between the base 52 and the fixing plate 56. To be done. A plurality of pushers 58 are arranged between the fixed plate 56 and the mold 46 in correspondence with predetermined pressing positions. The pusher 58 has a fluid pressure cylinder 60, and a pressing member 64 is fixed to a rod 62 extending from the fluid pressure cylinder 60.

Therefore, when each pusher 58 is arranged corresponding to a predetermined portion of the die 46, that is, a portion where the distortion of the die 46 is likely to occur, and a fluid pressure is applied to the fluid pressure cylinder 60, The end portion of the fluid pressure cylinder 60 is supported by the fixing plate 56, while the pressing member 64 fixed to the rod 62 applies a pressing force to a predetermined portion of the mold 46. Therefore, while the die 46 is gradually cooled to, for example, 300 ° C. to room temperature, a predetermined portion of the die 46 is pressed by the pressing member 6.
Since it is pressed and held by 4, it is possible to reliably prevent the mold 46 from being distorted.

In this case, in the first embodiment, the metal mold members 16a to 16d are arranged in the cavity 40 as a surface mold, and the passage 30a for circulating the cool air inside the metal mold members 16a to 16d. .About.30d are provided. Then, when the molten metal 44 is poured into the cavity 40, cold air is supplied from the cold air supply means 32 to the passages 30a to 30d via the supply pipe 31a and the air pipelines 28a to 28d, so that the inside of the cavity 40 is cooled. The molten metal 44 is the surface portion 2 that constitutes the metal mold members 16a to 16d.
6a to 26d, that is, the portion corresponding to the entire molding surface 46a of the mold 46 is rapidly cooled.

Therefore, the cooling time of the molten metal 44 can be shortened all at once, and the die 46 can be efficiently obtained in a short time, which contributes to cost reduction. Moreover, since the entire molding surface 46a of the mold 46 is rapidly cooled, the molding surface 46a and its vicinity are densified.
As a result, when the molding surface 46a is processed to obtain the molding surface, pinholes do not occur on the molding surface, and the quality of the resin molded product molded using the mold 46 is improved at once. The advantage is improved. Moreover, there is an effect that the hardness in the vicinity of the molding surface of the mold 46 is improved.

Further, in the first embodiment, a plurality of metal mold members 16a to 16d are provided, and iron plates 34a to 34c are interposed between the metal mold members 16a to 16d. Therefore, in particular, metal mold members 16a to 16d for casting a mold 46 for molding a large resin molded product such as a bumper.
Attaching and detaching work is simplified at once. This is because the handling work becomes easier as compared with the case of using a single large and heavy metal mold member.

Further, in the metal mold members 16a to 16d,
The distance H1 between the passages 30a and 30d corresponding to the corners or the vertical portions is set to be narrower than the distance H2 between the passages 30b and 30c corresponding to the horizontal flat portions (see FIG. 3).
For this reason, it becomes possible to prevent the occurrence of pinholes at the corners (corners) and the vertical wall (vertical portions) of the die 46 that is cast and molded.

Here, the metal mold members 16a to 16d include
A plurality of temperature sensors 36a to 36d for detecting the temperatures of the surface portions 26a to 26d and the passages 30a to 30d are provided. Thereby, the molten metal 44 can be easily rapidly cooled by controlling the temperature of the metal mold members 16a to 16d and the passages 30a to 30d, and the quality of the molding surface obtained by processing the molding surface 46a of the mold 46. Can be effectively improved.

FIG. 13 is a schematic structural explanatory view of a casting apparatus 80 according to the second embodiment of the present invention.

The casting apparatus 80 is a pair with the casting apparatus 10 according to the first embodiment.
While 0 casts a concave mold 46, this casting device 80
Is for casting a convex mold (not shown). The casting apparatus 80 includes a mold 86 having a foundry sand 82 and a foaming model 84, and one or a plurality of metal mold members 88 embedded in the mold 86. An air duct 92 having a cooling passage 90 is fixed in the metal mold member 88, and the air duct 92 can communicate with a cold air supply means (not shown).

The metal mold member 88 is provided with a concave surface portion 94, and this surface portion 94 forms the entire molding surface of the resin molding die. In this metal mold member 88, the air pipe 92 extends outward from the side surface of the metal mold member 88 while avoiding the surface portion 94.

The operation of the casting apparatus 80 thus configured is the same as that of the casting apparatus 10 according to the first embodiment described above, and the detailed description thereof will be omitted. This casting device 80
Then, one or more metal mold members 88 are placed on the cavity surface 14 as a surface mold. Then, by circulating the cool air in the passage 90, the convex mold can be efficiently cast in a short time, and no pinhole is generated on the molding surface. The same effect can be obtained.

In the first and second embodiments, a zinc alloy or an aluminum alloy is used to cast the mold 46, but a zinc alloy is preferably used. This is because zinc alloys are cheaper than aluminum alloys, easier to cast, and easier to process. On the other hand, aluminum alloys are preferably used for the metal mold members 16a to 16d and 88 which are chillers. Aluminum alloys are cheaper than copper alloys, easier to cast, easier to surface-treat, and shorter casting process.

[0038]

The cast ZoSo location according to the present invention, metallic members having a cooling passage therein is disposed as a surface mold to the cavity surface of the mold, while pouring the molten metal into the cavity, for the cooling Since the cooling medium is supplied to the passage,
The molten metal is rapidly cooled from the molding surface side in contact with the metal mold member, and the mold can be efficiently obtained in a short time. Moreover, the molding surface of the mold is rapidly cooled to achieve densification, preventing the occurrence of pinholes as much as possible,
A mold capable of molding a high quality molded product can be easily and surely obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a casting apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective explanatory view of a metal mold member that constitutes the casting apparatus.

FIG. 3 is a vertical cross-sectional explanatory view of the metal mold member.

FIG. 4 is a partial vertical cross-sectional explanatory view of the metal mold member.

FIG. 5 is a partial perspective view of the casting apparatus.

FIG. 6 is a perspective explanatory view showing a state in which the metal mold member is embedded in a mold forming the casting apparatus.

FIG. 7 is a perspective view illustrating a state in which the mold is inverted.

FIG. 8 is a perspective explanatory view when a foamed model is removed from the mold.

FIG. 9 is a vertical cross-sectional explanatory view when molten metal is poured into a cavity in the mold.

FIG. 10 is an explanatory perspective view showing a state where the cavity is filled with molten metal.

FIG. 11 is a perspective explanatory view of a mold detached from the mold.

FIG. 12 is a schematic perspective explanatory view of a press machine that presses a cast mold.

FIG. 13 is a schematic vertical cross-sectional explanatory view of a casting apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

10, 80 ... Casting device 12, 86 ... Mold 14 ... Cavity surface 16a to 16d,
88 ... Metal mold member 18 ... Iron frame 22, 84 ... Foam model 24, 82 ... Foundry sand 26a-26d,
94 ... Surface portions 28a to 28d, 92 ... Air pipelines 30a to 30d,
90 ... passage 32 ... cold air supply means 34a-34c ...
Iron plates 36a to 36d ... Temperature sensor 40 ... Cavity 42 ... Gate 44 ... Molten metal 46 ... Mold 46a ... Molding surface 50 ... Press machine 58 ... Pusher

Front page continuation (72) Inventor Nobuho Kikuchi 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (72) Honori Yoshinaga 1-10-1 Shin-Sayama, Saiyama-shi, Saitama Honda Engineering Co., Ltd. (72) Inventor Kazuhiro Taguchi 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (72) Inventor Hiroshi Kaneko, Nishirahama, Yoshida-cho, Yoshira-cho, Hazu-gun, Aichi Prefecture (72) Inventor Shinji Miyaji 71 Nakanishihama, Yoshinaka, Kyoshi-cho, Hazu-gun, Aichi Pref.Kenko Alloy Co., Ltd. (56) References JP 58-148072 (JP, A) JP 5-9632 (JP, A) JP 53-11830 (JP, A) JP 7-236963 (JP , A) JP 5-17815 (JP, A) JP 10-192980 (JP, A) Actual development 2-22241 JP, U) (58) investigated the field (Int.Cl. ^7, DB name) B22C 9 / 00,9 / 02,9 / 06 B22D 15 / 00,17 / 22,30 / 00

Claims (2)

(57) [Claims] 1. A mold made of foundry sand and the like,
It is placed as a surface mold on the cavity surface,
The metal mold member with the cooling passage inside and the cooling passage
A cooling medium supply means for communicating a cooling medium to flow,
Mold using molten metal of zinc alloy or aluminum alloy
A casting device for casting, wherein the metal mold member is provided with a plurality of the cooling passages, the intervals between the respective cooling passages corresponding to the corners or vertical portions of the metal mold member. A casting apparatus characterized in that it is set to be narrower than an interval between cooling passages corresponding to a horizontal flat portion of the metal mold member. 2. The casting apparatus according to claim 1 , wherein the metal mold member is divided into a plurality of pieces by interposing a metal plate .