Active air exhaust system structure

By designing an active exhaust system structure in low-pressure casting mold, the problems of insufficient pouring in the thin wall area of ​​the casting and gas trapped in the cavity are solved, and gas in the cavity is quickly discharged, avoiding casting defects, and improving the yield rate of the casting.

CN222754400UActive Publication Date: 2025-04-15FOSHAN NANHAI SUPERBAND MOULD CO LTD
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Patent Information

Application Number
CN202420769411.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-12
Publication Date
2025-04-15
Estimated Expiration
2034-04-12

AI Technical Summary

Technical Problem

During low-pressure casting, the thin-walled area of ​​the casting is prone to insufficient pouring and gas trapping in the cavity, resulting in casting defects such as pores, shrinkage, etc., which affects the yield rate.

Method used

An exhaust system structure for active exhaust gas is designed, including a ring groove on the mold and a first exhaust passage is provided with a first exhaust plug and an exhaust device in the passage. The exhaust device is used to form a negative pressure to promote the exhaust of gas in the mold cavity through the exhaust passage.

Benefits of technology

Through the use of the active exhaust system, the gas in the mold cavity can be quickly discharged, avoid defects such as pores and shrinkage inside the casting, and improve the yield of the casting.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an exhaust system structure capable of extracting air actively. The exhaust system structure comprises a mold, a first exhaust plug and an air extractor. The mold comprises a lower mold body and an upper mold body, the lower mold body and the upper mold body are assembled to form a cavity, the upper mold body is provided with an annular groove and a plurality of first exhaust channels, the annular groove is communicated with the first exhaust channels, and the first exhaust channels are communicated with the cavity through first exhaust holes. The first exhaust plugs correspond to the first exhaust holes in a one-to-one mode, and the first exhaust plugs are arranged in the first exhaust holes. The air extractor is connected with the first exhaust channel and used for forming negative pressure in the first exhaust channel. The air extractor can extract air in the first exhaust channel, so that the air pressure in the first exhaust channel is lower than that in the cavity, and the air in the cavity enters the first exhaust channel through the first exhaust plug, so that the air in the cavity can be quickly exhausted, and the casting defects such as air holes and shrinkage porosity in a casting are avoided; and the yield of castings is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of die casting molds, in particular to an exhaust system structure for active air extraction. Background Art

[0002] In the field of low-pressure casting, there is a risk of insufficient pouring in the thin-walled area of ​​the casting, and air entrapment in the cavity often occurs. Although exhaust lines, exhaust grooves, exhaust plugs, etc. are set on the parting surface and cavity area of ​​the mold, in actual production, it is still easy to increase the pressure in the cavity and reduce the fluidity of the molten metal, resulting in various casting defects, such as poor appearance molding, insufficient pouring, serious marks on the casting surface, internal pores in the casting, shrinkage and other casting defects. Utility Model Content

[0003] The utility model aims to solve the above-mentioned related technical problems. To this end, the utility model proposes an exhaust system structure for active air extraction.

[0004] The present invention provides an active exhaust system structure, the active exhaust system structure comprising:

[0005] A mold, comprising a lower mold and an upper mold, wherein the lower mold and the upper mold are combined to form a mold cavity, the upper mold is provided with an annular groove and a plurality of first exhaust channels, the annular groove is respectively connected with the plurality of first exhaust channels, and the first exhaust channels are connected with the mold cavity through first exhaust holes;

[0006] a first exhaust plug, wherein a plurality of the first exhaust plugs correspond to a plurality of the first exhaust holes one by one, and the first exhaust plugs are arranged in the first exhaust holes;

[0007] An air extraction device is connected to the first exhaust channel, and is used to form a negative pressure in the first exhaust channel.

[0008] The active exhaust system structure according to the embodiment of the utility model has at least the following technical effects: when the mold is closed for low-pressure casting, the exhaust device extracts the gas in the first exhaust channel, so that the air pressure in the first exhaust channel is lower than the air pressure in the cavity, and the gas in the cavity enters the first exhaust channel through the first exhaust plug, so that the gas in the cavity can be quickly discharged, thereby avoiding the occurrence of casting defects such as internal pores and shrinkage in the casting, and improving the yield rate of the casting.

[0009] According to some embodiments of the present invention, a plurality of the first exhaust channels are distributed circumferentially around the axis of the upper mold.

[0010] According to some embodiments of the utility model, it also includes a top plate, which is ring-shaped and is covered on the upper mold. A second exhaust channel is provided in the top plate, and the second exhaust channel is connected to the first exhaust channel. The exhaust device is connected to the second exhaust channel.

[0011] According to some embodiments of the utility model, the lower mold includes a lower module and a side slide block, the mold cavity includes a first cavity and a second cavity, a first cavity is formed between the lower module and the upper mold, a second cavity is formed between the side slide block and the upper mold, and the lower end of the second cavity is connected to a side of the second cavity away from the axis of the upper mold.

[0012] According to some embodiments of the present invention, the first exhaust hole is connected to the upper end of the second cavity, and the diverter cone of the upper mold is arranged in the middle of the upper mold to connect to the first cavity.

[0013] According to some embodiments of the utility model, the first cavity includes an annular narrow area and a gate area, the annular narrow area surrounds and is connected to the gate area, the upper mold is provided with a plurality of first sleeves to be connected to the annular narrow area, the plurality of first sleeves correspond one-to-one to a plurality of second exhaust plugs, and the second exhaust plugs are arranged in the first sleeves.

[0014] According to some embodiments of the utility model, the upper mold is provided with a plurality of second sleeves to be connected to the gate area, and the plurality of second sleeves correspond one-to-one to a plurality of third exhaust plugs, and the third exhaust plugs are arranged in the second sleeves.

[0015] According to some embodiments of the present invention, a plurality of the first sleeves are distributed circumferentially around the axis of the upper die; a plurality of the second sleeves are distributed circumferentially around the axis of the upper die.

[0016] According to some embodiments of the present utility model, the first sleeve is connected to a first air outlet pipe, and the first air outlet pipe is connected to the air extraction device.

[0017] According to some embodiments of the present invention, the second sleeve is connected to a second air outlet pipe, and the second air outlet pipe is connected to the first air outlet pipe.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1It is a structural schematic diagram of an exhaust system structure of active air extraction in some embodiments of the utility model;

[0021] Figure 2 is a cross-sectional view of an exhaust system structure for active air extraction in some embodiments of the utility model;

[0022] Figure 3 yes Figure 2 An enlarged schematic diagram of point A;

[0023] Figure 4 yes Figure 2 An enlarged schematic diagram of point B;

[0024] Figure 5 It is an exploded view of a part of the structure of an exhaust system for active air extraction in some embodiments of the present invention.

[0025] Figure Number:

[0026] The mold 100, the upper mold 110, the lower mold 120, the mold cavity 130, the annular groove 140, the first exhaust channel 150, the first exhaust hole 160, the first exhaust plug 170, the top plate 180, and the second exhaust channel 181;

[0027] Lower module 200, side slider 210, first cavity 221, second cavity 222, splitter cone 230, annular narrow area 241, gate area 242, first sleeve 251, second exhaust plug 252, second sleeve 261, third exhaust plug 262, first air outlet pipe 271, second air outlet pipe 272;

[0028] The air extraction device 300. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0034] According to some embodiments of the present invention, referring to Figures 1 to 5 The exhaust system structure of active exhaust includes a mold 100, a first exhaust plug 170 and an exhaust device 300. The mold 100 includes a lower mold 120 and an upper mold 110. The lower mold 120 and the upper mold 110 are combined to form a cavity 130. An annular groove 140 is provided on the outer side of the upper mold 110. A plurality of first exhaust channels 150 are provided on the upper end of the upper mold 110. The first exhaust channels 150 extend in the up-down direction. The plurality of first exhaust channels 150 are circumferentially distributed around the axis of the upper mold 110. The annular groove 140 is respectively connected to the plurality of first exhaust channels 150. The lower end of the first exhaust channel 150 is connected to the first exhaust hole 160. The first exhaust hole 160 is connected to the cavity 130. The plurality of first exhaust plugs 170 correspond to the plurality of first exhaust holes 160 one by one. The first exhaust plugs 170 are arranged in the first exhaust holes 160. The air extraction device 300 is connected to the first exhaust passage 150 , and is used to form a negative pressure in the first exhaust passage 150 .

[0035] When the mold is closed for low-pressure casting, the molten metal will squeeze out the gas in the cavity 130 when filling the cavity 130, and the vacuum device 300 will extract the gas in the first exhaust channel 150, so that the air pressure in the first exhaust channel 150 is lower than the air pressure in the cavity 130, and the gas in the cavity 130 actively enters the first exhaust channel 150 through the first exhaust plug 170. Under the conditions of molten metal squeezing and negative pressure, the gas in the cavity 130 can be quickly discharged to avoid casting defects such as internal pores and shrinkage in the casting, thereby improving the yield rate of the casting.

[0036] Preferably, refer to Figure 2 and Figure 3The exhaust system structure of active exhaust also includes a top plate 180, which is annular and is covered on the upper mold 110. A second exhaust channel 181 is provided in the top plate 180, and the second exhaust channel 181 is connected to the first exhaust channel 150. The exhaust device 300 is connected to the second exhaust channel 181. In this embodiment, one of the first exhaust channels 150 is connected to the second exhaust channel 181 of the top plate 180, and the upper ports of the remaining first exhaust channels 150 are blocked. The gases in the multiple first exhaust channels 150 converge through the annular groove 140 and flow into the second exhaust channel 181, and the exhaust device 300 extracts the gas in the second exhaust channel 181. It can be understood that, according to needs, multiple second exhaust channels 181 can be provided in the top plate 180 to correspond to the first exhaust channels 150 one by one.

[0037] According to some embodiments of the present invention, referring to Figures 2 to 4 The lower mold 120 includes a lower mold block 200 and a side slider 210, and the mold cavity 130 includes a first cavity 221 and a second cavity 222. The first cavity 221 is formed between the lower mold block 200 and the upper mold 110, and the second cavity 222 is formed between the side slider 210 and the upper mold 110. The lower end of the second cavity 222 is connected to the side of the second cavity 222 away from the axis of the upper mold 110. The first exhaust hole 160 is connected to the upper end of the second cavity 222, and the diverter cone 230 of the upper mold 110 is arranged in the middle of the upper mold 110 to connect with the first cavity 221. After the molten metal flows into the mold cavity 130, it passes through the first cavity 221 and then enters the second cavity 222, and moves upward in the second cavity 222. The gas gradually moves upward under the push of the negative pressure and the molten metal and enters the first exhaust channel 150 through the first exhaust hole 160.

[0038] Preferably, refer to Figure 4 The first cavity 221 includes an annular narrow area 241 and a gate area 242. The annular narrow area 241 surrounds and is connected to the gate area 242. The upper mold 110 is provided with a plurality of first sleeves 251 to be connected to the annular narrow area 241. The first sleeves 251 are welded on the upper mold 110. The plurality of first sleeves 251 correspond to the plurality of second exhaust plugs 252 one by one. The second exhaust plugs 252 are arranged in the first sleeves 251. The plurality of first sleeves 251 are circumferentially distributed around the axis of the upper mold 110. The first sleeve 251 is connected to the first air outlet pipe 271, and the first air outlet pipe 271 is connected to the exhaust device 300. The gas in the annular narrow area 241 can be quickly discharged from the second exhaust plugs 252 to avoid remaining in the annular narrow area 241 and affecting the solidification and molding of the molten metal.

[0039] According to some embodiments of the utility model, the upper mold 110 is provided with a plurality of second sleeves 261 to be connected to the gate area 242, the plurality of second sleeves 261 correspond to the plurality of third exhaust plugs 262 one by one, the second sleeves 261 are welded to the upper mold 110, and the third exhaust plugs 262 are arranged in the second sleeves 261. The plurality of second sleeves 261 are circumferentially distributed around the axis of the upper mold 110. The second sleeve 261 is connected to the second gas outlet pipe 272, and the second gas outlet pipe 272 is connected to the first gas outlet pipe 271. The gas in the gate area 242 can be quickly discharged from the third exhaust plugs 262 to avoid remaining in the gate area 242 and affecting the solidification and molding of the molten metal.

[0040] It should be noted that a plurality of fine pores are provided on the first exhaust plug 170 , the second exhaust plug 252 and the third exhaust plug 262 to ensure that the gas can pass through the exhaust plugs and block the molten metal.

[0041] In the description of this specification, the description with reference to the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An active exhaust system structure, characterized in that: include: A mold (100) comprises a lower mold (120) and an upper mold (110), wherein the lower mold (120) and the upper mold (110) are combined to form a mold cavity (130), and the upper mold (110) is provided with an annular groove (140) and a plurality of first exhaust channels (150), wherein the annular groove (140) is respectively connected to the plurality of first exhaust channels (150), and the first exhaust channels (150) are connected to the mold cavity (130) through first exhaust holes (160); a first exhaust plug (170), wherein a plurality of the first exhaust plugs (170) correspond one-to-one to a plurality of the first exhaust holes (160), and the first exhaust plugs (170) are arranged in the first exhaust holes (160); An air extraction device (300) is connected to the first exhaust channel (150), and the air extraction device (300) is used to form a negative pressure in the first exhaust channel (150).

2. The active exhaust system structure according to claim 1, characterized in that: A plurality of the first exhaust channels (150) are distributed circumferentially around the axis of the upper mold (110).

3. The active exhaust system structure according to claim 1, characterized in that: The invention also comprises a top plate (180), wherein the top plate (180) is annular and covers the upper mold (110). A second exhaust channel (181) is provided in the top plate (180), and the second exhaust channel (181) is communicated with the first exhaust channel (150). The exhaust device (300) is connected with the second exhaust channel (181).

4. The active exhaust system structure according to claim 1, characterized in that: The lower mold (120) includes a lower mold block (200) and a side slider (210), and the mold cavity (130) includes a first cavity (221) and a second cavity (222), the first cavity (221) is formed between the lower mold block (200) and the upper mold (110), and the second cavity (222) is formed between the side slider (210) and the upper mold (110), and the lower end of the second cavity (222) is connected to a side of the second cavity (222) away from the axis of the upper mold (110).

5. The active exhaust system structure according to claim 4, characterized in that: The first exhaust hole (160) is connected to the upper end of the second cavity (222), and the diverter cone (230) of the upper mold (110) is arranged in the middle of the upper mold (110) to connect to the first cavity (221).

6. The active exhaust system structure according to claim 4, characterized in that: The first cavity (221) includes an annular narrow area (241) and a gate area (242), wherein the annular narrow area (241) surrounds and is connected to the gate area (242), and the upper mold (110) is provided with a plurality of first sleeves (251) to be connected to the annular narrow area (241), and the plurality of first sleeves (251) correspond one-to-one to a plurality of second exhaust plugs (252), and the second exhaust plugs (252) are arranged in the first sleeves (251).

7. The active exhaust system structure according to claim 6, characterized in that: The upper mold (110) is provided with a plurality of second sleeves (261) to be connected to the gate area (242), and the plurality of second sleeves (261) correspond one-to-one to a plurality of third exhaust plugs (262), and the third exhaust plugs (262) are arranged in the second sleeves (261).

8. The active exhaust system structure according to claim 7, characterized in that: A plurality of the first sleeves (251) are distributed circumferentially around the axis of the upper mold (110); and a plurality of the second sleeves (261) are distributed circumferentially around the axis of the upper mold (110).

9. The active exhaust system structure according to claim 8, characterized in that: The first sleeve (251) is connected to a first air outlet pipe (271), and the first air outlet pipe (271) is connected to the air extraction device (300).

10. The active exhaust system structure according to claim 9, characterized in that: The second sleeve (261) is connected to the second air outlet pipe (272), and the second air outlet pipe (272) is connected to the first air outlet pipe (271).