Casting mold capable of rapidly discharging sand core gas

Abstract

The utility model discloses a casting mould capable of quickly discharging gas generated by a sand core, which comprises a front mould base and a rear mould base, a casting cavity is arranged between the front mould base and the rear mould base, a casting port is arranged at the upper end of the casting cavity, two positioning guide columns and two positioning guide sleeves are arranged on the opposite sides of the front mould base and the rear mould base, and the positioning guide columns and the positioning guide sleeves are arranged on the opposite sides of the front mould base and the rear mould base. A negative pressure sand core mechanism is mounted on the inner side of the casting cavity; the negative pressure sand core mechanism comprises a sand core main body, a negative pressure cavity is formed in the inner side of the sand core main body, a first exhaust pipe is mounted at the bottom end of the sand core main body, and a second exhaust pipe is mounted at the bottom end of the first exhaust pipe; a connecting transverse rod is installed on the inner side of the bottom end of the front mold base and the inner side of the bottom end of the rear mold base, and a connecting sleeve is installed at one end of the connecting transverse rod in a sleeved mode and connected with the connecting transverse rod through threads. According to the utility model, gas generated by the sand core during casting is quickly exhausted, so that the defects of air holes and the like caused by the fact that the gas invades into molten aluminum are reduced, and the casting yield of castings with large-size sand core structures is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting molds, in particular to a casting mold capable of quickly discharging the gas generated by a sand core. Background Technique

[0002] With the rapid development of industry, aluminum alloy castings have also been widely used in various fields, and sand core structure castings occupy an important position. When casting, the surface of the sand core is surrounded by molten aluminum alloy. Under the action of high-temperature molten aluminum alloy, due to the evaporation of moisture and the volatilization, decomposition and combustion of organic matter, a large amount of gas will be generated in a very short time after casting. As the gas expands, the gas volume increases and the gas temperature rises, a large gas pressure will be formed.

[0003] If the gas cannot be discharged completely in time, some of the gas may invade the molten aluminum alloy, forming casting defects such as pores, and seriously leading to the scrapping of the casting; therefore, it is crucial to do a good job in sand core exhaust for the casting forming of sand core castings.

[0004] Currently, for the casting forming of large-size sand core castings, selecting sand core materials with low gas evolution and sand core coatings with good heat insulation effects, as well as setting vent holes in the sand core, will not only increase costs and reduce production efficiency, but also be unable to be used due to the limitation of the sand core structure; therefore, it does not meet the existing requirements, and for this reason, we propose a casting mold capable of quickly discharging the gas generated by a sand core. Content of the Utility Model

[0005] The purpose of the utility model is to provide a casting mold capable of quickly discharging the gas generated by a sand core, so as to solve the problems mentioned in the above background technique that currently, for the casting forming of large-size sand core castings, selecting sand core materials with low gas evolution and sand core coatings with good heat insulation effects, as well as setting vent holes in the sand core, will not only increase costs and reduce production efficiency, but also be unable to be used due to the limitation of the sand core structure.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A casting mold capable of quickly discharging the gas generated by a sand core, including a front mold base and a rear mold base, a casting cavity is arranged between the front mold base and the rear mold base, a casting port is arranged at the upper end of the casting cavity, two positioning guide posts and positioning guide sleeves are arranged on each side of the front mold base and the rear mold base facing each other, and a negative pressure sand core mechanism is installed inside the casting cavity;

[0007] The negative pressure sand core mechanism includes a sand core main body, a negative pressure cavity is arranged inside the sand core main body, a first air extraction pipe is installed at the bottom end of the sand core main body, and a second air extraction pipe is installed at the bottom end of the first air extraction pipe.

[0008] Preferably, a connecting cross bar is installed inside the bottom ends of the front mold base and the rear mold base, one end of the connecting cross bar is sleeved with a connecting sleeve, and the connecting sleeve is threadedly connected with the connecting cross bar.

[0009] Preferably, the casting gate is connected to the casting cavity in a through manner, and the sand core body is snap-fitted and installed inside the casting cavity.

[0010] Preferably, a plurality of exhaust grains are fixedly provided inside both the front mold base and the rear mold base, and a plurality of air guide holes are provided inside the exhaust grains.

[0011] Preferably, both the first air suction pipe and the second air suction pipe are fixedly connected to the rear mold base, and the second air suction pipe is connected to the negative pressure cavity in a through manner through the first air suction pipe.

[0012] Preferably, the front mold base and the rear mold base are mutually inserted and installed through positioning guide columns and positioning guide sleeves. The front mold base and the rear mold base form a casting mold. The casting mold is used for casting production by an inclined gravity casting machine, and a filter screen is provided inside the casting gate.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model forms a casting mold by the front mold base and the rear mold base, installs the casting mold on an inclined gravity casting machine. During the casting process, the drop of the aluminum alloy melt is small, and the aluminum alloy melt always flows smoothly along the side wall of the mold, thereby reducing and avoiding the splashing of the aluminum alloy melt and the chance of the aluminum alloy melt sucking air and generating slag. Since the liquid level of the continuously rising aluminum alloy melt always remains in a quiet state, the gas precipitated during the solidification process is also easily discharged, and the melt can be conveniently injected into the inside of the casting cavity through the casting gate;

[0015] 2. The present utility model is provided with a negative pressure cavity inside the sand core body, which helps to reduce the amount of the sand core body used and the gas evolution amount of the sand core body at the same time, and can also play a role in guiding and accommodating gas, achieving a good buffering effect and being beneficial to subsequent exhaust. During the casting process, the exhaust of the mold can be assisted by a plurality of exhaust grains. After the casting is completed, the negative pressure cavity is evacuated through the first air suction pipe and the second air suction pipe, so as to discharge the gas generated during the casting of the sand core body, and reduce defects such as pores caused by the intrusion of gas into the aluminum liquid. Description of the Drawings

[0016] Figure 1 is a schematic structural view of the whole of the present utility model;

[0017] Figure 2 is a rear view of the whole of the present utility model;

[0018] Figure 3 is a schematic sectional structural view of the whole of the present utility model;

[0019] Figure 4 is a schematic installation structure view of the sand core body of the present utility model;

[0020] Figure 5 This is a partial cross-sectional structural schematic diagram of the connecting cross bar of the utility model.

[0021] In the figure: 1, front mold base; 2, rear mold base; 3, casting port; 4, exhaust granule; 5, negative pressure core mechanism; 6, core body; 7, negative pressure cavity; 8, first suction pipe; 9, second suction pipe; 10, positioning guide post; 11, casting cavity; 12, positioning guide sleeve; 13, connecting cross bar; 14, connecting sleeve. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0023] Please refer to Figures 1 to 4 , an embodiment provided by the present utility model: a casting mold capable of quickly discharging the gas generated by the core, including a front mold base 1 and a rear mold base 2. On the opposite sides of the front mold base 1 and the rear mold base 2, two positioning guide posts 10 and positioning guide sleeves 12 are provided. The front mold base 1 and the rear mold base 2 are mutually inserted and installed through the positioning guide posts 10 and the positioning guide sleeves 12. The front mold base 1 and the rear mold base 2 form a casting mold. The casting mold uses an inclined gravity casting machine for casting production. The casting mold is in an inclined state during casting. During the casting process, the drop of the aluminum alloy melt is small, and the aluminum alloy melt always flows smoothly along the side wall of the mold, thereby reducing and avoiding the splashing of the aluminum alloy melt and the chance of the aluminum alloy melt inhaling gas and generating slag.

[0024] Please refer to Figure 3 and Figure 4 , a casting cavity 11 is provided between the front mold base 1 and the rear mold base 2. A casting port 3 is provided at the upper end of the casting cavity 11. A filter screen is provided inside the casting port 3, which can purify the aluminum alloy melt and improve the overall quality of the casting.

[0025] Please refer to Figures 2 to 4 , a negative pressure core mechanism 5 is installed inside the casting cavity 11. The negative pressure core mechanism 5 includes a core body 6. The casting port 3 is connected to the casting cavity 11 in a through manner. The core body 6 is clamped and installed inside the casting cavity 11. A negative pressure cavity 7 is provided inside the core body 6. A first suction pipe 8 is installed at the bottom end of the core body 6. A second suction pipe 9 is installed at the bottom end of the first suction pipe 8. Both the first suction pipe 8 and the second suction pipe 9 are fixedly connected to the rear mold base 2. The second suction pipe 9 is connected to the negative pressure cavity 7 through the first suction pipe 8 in a through manner. By pumping air into the negative pressure cavity 7 through the first suction pipe 8 and the second suction pipe 9, the gas generated during the casting of the core body 6 is discharged, reducing defects such as pores caused by the intrusion of gas into the aluminum liquid.

[0026] Please refer toFigure 2 , on the inner sides of the front mold base 1 and the rear mold base 2, a plurality of exhaust grains 4 are fixedly provided. A plurality of air guide holes are provided inside the exhaust grains 4. Through the plurality of exhaust grains 4, the exhaust of the mold can be assisted during the casting process.

[0027] Please refer to Figure 5 , on the inner sides of the bottoms of the front mold base 1 and the rear mold base 2, a connecting cross bar 13 is installed. One end of the connecting cross bar 13 is sleeved with a connecting sleeve 14. The connecting sleeve 14 is threadedly connected to the connecting cross bar 13. Connecting the front mold base 1 and the rear mold base 2 through the connecting cross bar 13 and the connecting sleeve 14 facilitates pre-positioning of the front mold base 1 and the rear mold base 2 and maintains the stability of the casting cavity 11.

[0028] During use, the front mold base 1 and the rear mold base 2 are inserted and installed with each other through the positioning guide posts 10 and the positioning guide sleeves 12, so that a casting cavity 11 is formed inside the front mold base 1 and the rear mold base 2. The negative pressure core mechanism 5 is placed inside the casting cavity 11, so that the core body 6 is snap-fitted and installed with the rear mold base 2. The front mold base 1 and the rear mold base 2 form a casting mold. The casting mold is installed on an inclined gravity casting machine. During the casting process, the drop of the aluminum alloy melt is small, and the aluminum alloy melt always flows smoothly along the side wall of the mold, thereby reducing and avoiding the splashing of the aluminum alloy melt and the chance of the aluminum alloy melt sucking air and generating slag.

[0029] Since the liquid level of the continuously rising aluminum alloy melt always remains in a quiet state, the gas precipitated during the solidification process is also easily discharged. It is convenient to inject the melt into the inside of the casting cavity 11 through the casting port 3. A filter screen is provided inside the casting port 3, which can purify the aluminum alloy melt and improve the overall quality of the casting. A negative pressure cavity 7 is provided inside the core body 6, which helps to reduce the amount of the core body 6 used and reduce the gas evolution amount of the core body 6. At the same time, it can guide and accommodate the gas and play a good buffering effect, which is beneficial to subsequent exhaust;

[0030] During the casting process, the exhaust of the mold can be assisted through the plurality of exhaust grains 4. After the casting is completed, the negative pressure cavity 7 inside the core body 6 is evacuated through the first exhaust pipe 8 and the second exhaust pipe 9. Then the negative pressure cavity 7 is in a negative pressure state, realizing the discharge of the gas generated during the casting of the core body 6 and reducing defects such as pores caused by the intrusion of gas into the aluminum liquid.

[0031] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A casting mold capable of quickly discharging gas generated by a sand core, comprising a front mold base (1) and a rear mold base (2), characterized in that: A casting cavity (11) is provided between the front mold base (1) and the rear mold base (2), a casting port (3) is provided at the upper end of the casting cavity (11), two positioning guide columns (10) and a positioning guide sleeve (12) are provided on the sides facing each other of the front mold base (1) and the rear mold base (2), and a negative pressure sand core mechanism (5) is installed on the inner side of the casting cavity (11); The negative pressure sand core mechanism (5) comprises a sand core body (6), a negative pressure chamber (7) is provided on the inner side of the sand core body (6), a first air extraction pipe (8) is installed at the bottom end of the sand core body (6), and a second air extraction pipe (9) is installed at the bottom end of the first air extraction pipe (8).

2. A casting mold capable of quickly discharging sand core gas according to claim 1, characterized in that: A connecting cross bar (13) is installed on the inner sides of the bottom ends of the front mold base (1) and the rear mold base (2), and a connecting sleeve (14) is installed on one end of the connecting cross bar (13), and the connecting sleeve (14) is connected to the connecting cross bar (13) by means of threads.

3. A casting mold capable of quickly discharging sand core gas according to claim 1, characterized in that: The casting port (3) is connected to the casting cavity (11) through-hole, and the sand core body (6) is clamped and installed on the inner side of the casting cavity (11).

4. A casting mold capable of quickly discharging sand core gas according to claim 1, characterized in that: A plurality of exhaust particles (4) are fixedly provided on the inner sides of the front mold base (1) and the rear mold base (2), and a plurality of air guide holes are provided on the inner sides of the exhaust particles (4).

5. A casting mold capable of quickly discharging gas generated by a sand core according to claim 1, characterized in that: The first air extraction pipe (8) and the second air extraction pipe (9) are both fixedly connected to the rear mold base (2), and the second air extraction pipe (9) is connected to the negative pressure chamber (7) through the first air extraction pipe (8).

6. A casting mold capable of quickly discharging sand core gas according to claim 1, characterized in that: The front mold base (1) and the rear mold base (2) are plugged and installed with each other through a positioning guide column (10) and a positioning guide sleeve (12). The front mold base (1) and the rear mold base (2) form a casting mold. The casting mold is cast and produced using an inclined gravity casting machine. A filter screen is provided on the inner side of the casting port (3).

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