CN216065485U - Heat-preservation pouring basin device for low-pressure casting - Google Patents
Heat-preservation pouring basin device for low-pressure casting Download PDFInfo
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- CN216065485U CN216065485U CN202122357013.2U CN202122357013U CN216065485U CN 216065485 U CN216065485 U CN 216065485U CN 202122357013 U CN202122357013 U CN 202122357013U CN 216065485 U CN216065485 U CN 216065485U
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Abstract
The utility model discloses a heat-preservation pouring basin device for low-pressure casting, which comprises a pouring basin unit detachably connected and arranged below a casting mold, wherein the bottom of the pouring basin unit is communicated with a liquid lifting pipe, and the liquid lifting pipe is used for conveying metal liquid which is externally pressurized into the casting mold through the pouring basin unit against the direction of gravity; the pouring basin unit comprises a pouring basin body and a pouring basin cover, the pouring basin cover is connected and arranged above the pouring basin body to form a cavity for containing molten metal together, and a plurality of pouring gates are arranged on the pouring basin cover; a first heat-insulating layer is arranged on the inner wall of the pouring basin body, and a second heat-insulating layer is arranged on the inner wall of the pouring basin cover. In the pouring process, gas heating is cancelled, so that energy consumption is reduced; the temperature around the die is reduced, so that the die is not easy to crack, the pouring basin and the pouring basin cover are not deformed, the service life of the die is prolonged, and the consumption of spare parts is reduced; the temperature around the die is reduced, so that the casting can be solidified more quickly, and the production efficiency of the casting is improved; the safety of the casting process is improved, and the casting process is more stable and controllable.
Description
Technical Field
The utility model relates to the field of casting molds, in particular to a heat-preservation pouring basin device for low-pressure casting.
Background
The low-pressure casting is an anti-gravity casting method, which means that liquid metal fills a cavity against the gravity direction under the action of external force and is solidified and formed, and the low-pressure casting is called because the used pressure is low. In low-pressure casting, one or more gates are arranged at the thick part of the casting to complete the mold filling and feeding of the casting. Aiming at a casting with a plurality of hot junctions on the same surface, a plurality of gates are required to be arranged; at present, multi-gate feeding comprises two process schemes of gate basin shunting and gate core shunting.
The prior pouring gate core process scheme has the following problems:
1) in the pressure maintaining stage, the bottom of the pouring gate core is subjected to the thermal action of high-temperature aluminum liquid to cause the resin decomposition sand core to collapse, collapsed sand grains flow into the liquid lifting pipe when the equipment is decompressed, the sand grains enter a mold cavity along with the aluminum liquid and are remained in a casting during the next production cycle, and the produced casting is easy to scrap due to the sand hole defect after being processed and has higher waste proportion;
2) pouring gate cores need to be placed in each mould, core making and post-treatment sand vibrating procedures are added, and material labor cost is increased.
The current runner bowl solution does not have the above problems, but still has the following problems:
1) the periphery of the pouring basin is provided with gas heating to reduce the temperature loss of metal liquid, prevent the freezing of a pouring gate and increase the energy consumption;
2) the peripheral temperature of the die is higher due to gas heating, so that the die is easy to crack, and the pouring basin cover are easy to deform and scrap, and the consumption of spare parts is increased;
3) the peripheral temperature of the die is higher due to gas heating, and the heat dissipation condition is limited in the casting solidification process, so that the production efficiency is lower;
4) the gas heating has certain potential safety hazard, and the safety risk in the production process is increased.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems existing in the prior art, the utility model aims to provide a heat-preservation pouring basin device for low-pressure casting.
In order to achieve the purpose, the utility model discloses the following technical scheme:
a heat-preservation pouring basin device for low-pressure casting comprises a pouring basin unit which is detachably connected and arranged below a casting mold, wherein the bottom of the pouring basin unit is communicated with a liquid lifting pipe, and the liquid lifting pipe is used for conveying molten metal which is externally pressed into the casting mold through the pouring basin unit against the direction of gravity;
the pouring basin unit comprises a pouring basin body and a pouring basin cover, the pouring basin cover is connected and arranged above the pouring basin body to form a cavity for containing molten metal together, a plurality of pouring gates are arranged on the pouring basin cover, and the pouring basin body, the pouring basin cover and the casting mold are connected through bolts;
further, a first heat-insulating layer is arranged on the inner wall of the pouring basin body, and a second heat-insulating layer is arranged on the inner wall of the pouring basin cover; the thickness of the first heat-insulating layer is greater than that of the second heat-insulating layer.
Further, the inner volume of the sprue basin body is larger than that of the sprue basin cover.
Specifically, the thickness of the first heat preservation layer is 14-16 mm, and the thickness of the second heat preservation layer is 9-11 mm.
Further, the thickness of the first heat-insulating layer is 15mm, and the thickness of the second heat-insulating layer is 10 mm.
Specifically, the cross section of the gate is in an inverted trapezoid shape.
Specifically, the number of the gates is at least 3.
Compared with the prior art, the utility model has the following beneficial effects:
the heat-preservation pouring basin for low-pressure casting, disclosed by the utility model, has the advantages that 1) gas heating is omitted in the pouring process, so that the energy consumption is reduced;
2) the temperature around the die is reduced, so that the die is not easy to crack, the pouring basin and the pouring basin cover are not deformed, the service life of the die is prolonged, and the consumption of spare parts is reduced;
3) the temperature around the die is reduced, so that the casting can be solidified more quickly, and the production efficiency of the casting is improved;
4) the safety of the casting process is improved, and the casting process is more stable and controllable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic view of an assembly structure of a heat-preservation pouring basin device for low-pressure casting;
in the drawings, the various reference numbers indicate:
1. a plant holding furnace; 2. a molten metal; 3. a riser tube; 4. a runner basin body; 5. a first insulating layer; 6. a pouring basin cover; 7. a second insulating layer; 8. a gate; 9. a bolt; 10. and (5) casting the mould.
Detailed Description
It should be noted that the terms "upper end", "lower end", and the like, when describing an orientation, are merely used to facilitate describing the utility model and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation. If the particular gesture changes, the directional indication changes accordingly. In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The terms "first" and "second" are used in the present invention to understand the specific meanings of the above terms according to the specific situation, for those skilled in the art.
The materials selected in the utility model comprise heat insulation materials with low heat conductivity, such as refractory fiber paste, and the like, which are common heat insulation materials in the market. The used base coating and surface coating are common coatings on the market, the base coating is used for improving the adhesiveness, such as DR87 base coating, and the surface coating is used for improving the corrosion resistance and aluminum adhesion resistance, such as 100M coating, and can be replaced by other coatings with the same function.
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Example 1
Referring to fig. 1, the present embodiment provides an insulation pouring basin device for low pressure casting, which includes a pouring basin unit detachably connected to a lower portion of a casting mold 10, a lift pipe 3 is connected to a bottom of the pouring basin unit, and the lift pipe 3 is used for conveying an externally pressurized molten metal 2 into the casting mold 10 through the pouring basin unit against a gravity direction; the molten metal 2 may be placed in a corrosion-resistant container, such as a holding furnace 1, which is a common apparatus in the industry, and may provide a certain pressure to the molten metal to fill the cavity of the runner basin unit against the direction of gravity.
The pouring basin unit comprises a pouring basin body 4 and a pouring basin cover 6, the pouring basin cover 6 is connected and arranged above the pouring basin body 4 to jointly form a cavity for containing the molten metal 2, a plurality of pouring gates 8 are arranged on the pouring basin cover 6, and in the embodiment, the pouring basin body 4, the pouring basin cover 6 and the casting mold 10 are connected through bolts 9; depending on the actual situation, a plurality of bolts 9 may be used for the fixation. A liquid inlet matched with the liquid lifting pipe 3 is arranged at the bottom of the pouring basin body 4.
And the inner walls of the pouring basin body 4 and the pouring basin cover 6 are both provided with heat-insulating layers. The heat preservation layer is arranged to prevent heat of the molten metal 2 in the cavity from losing, so that a good feeding effect of the pouring gate 8 is guaranteed. The heat-insulating layer is made of conventional refractory fiber paste materials and has good heat-insulating property.
In a preferred scheme of this embodiment, set up first heat preservation 5 on the inner wall of runner basin body 4, set up second heat preservation 7 on the inner wall of runner basin lid 6. The first heat preservation layer 5 and the second heat preservation layer 7 are both made of refractory fiber paste materials, the heat preservation performance is good, the heat of the molten metal 2 in the basin of the pouring gate 8 can not be lost, and therefore the good feeding effect of the pouring gate 8 is guaranteed. The thickness of the first heat-insulating layer 5 is larger than that of the second heat-insulating layer 7. The arrangement is that a large amount of molten metal 2 is placed in the pouring basin body 4, so that the finally realized heat preservation effect is better.
In this embodiment, the sprue cup body 4 and the sprue cup cover 6 are made of nodular cast iron (QT500-7) or hot die steel (H13), and since gas heating is omitted, there is no risk of thermal deformation, and the sprue cup can be used for a long time in the service life of the material (about 5 ten thousand mold times).
Further, the interior volume of the sprue cup body 4 is larger than the interior volume of the spout cover 6. As can be seen from fig. 1, the shape of the pouring basin body 4 is a bowl-like structure, and the pouring basin cover 6 is covered on the pouring basin body 4 and fixed by bolts 9.
In another preferred embodiment of the present invention, in order to further improve the heat preservation effect, DR87 primer may be coated on the runner bowl body 4 and the runner bowl cover 6 in advance to improve the adhesion, then refractory fiber pastes are coated respectively, the refractory fiber pastes are compressed with the aid of a mold (cast iron or aluminum material may be used) to improve the strength, and then 100M coating is coated respectively as a top coating to improve the corrosion resistance and the aluminum adhesion resistance. The mould is then made according to the size of the internal cavity of the pouring basin body 4 and the pouring basin cover 6, and can be placed in the pouring basin body 4 and the pouring basin cover 6 to press the refractory fiber paste.
Specifically, the thickness of the first heat-insulating layer 5 is 14-16 mm, and the thickness of the second heat-insulating layer 7 is 9-11 mm.
In a preferred embodiment of the present invention, the thickness of the first insulating layer 5 is 15mm, and the thickness of the second insulating layer 7 is 10 mm. The smooth connection and transition of the first heat-insulating layer 5 and the second heat-insulating layer 7 are beneficial to the smooth flow of the molten metal 2.
Specifically, the cross-sectional shape of the gate 8 is an inverted trapezoid. The specific shape of the gate 8 can be a truncated cone, the area of the lower bottom surface of the truncated cone is smaller than that of the upper bottom surface, and the purpose is to smoothly demould the casting when the mold is opened.
Specifically, the number of the gates 8 is at least 3.
The novel self-insulation pouring basin device without gas heating can be applied to a low-pressure casting die 10, can be manufactured in place at one time and used repeatedly, and is good in heat preservation performance, strong in durability, stable in casting quality and greatly improved in production efficiency.
In conclusion, the heat preservation pouring basin device for low-pressure casting disclosed by the utility model is implemented as follows:
1) designing the shapes and the sizes of the pouring basin body 4, the pouring basin cover 6 and the mould according to the requirements of specific castings to form drawings and manufacturing; the number of the moulds is 2, and the moulds are respectively matched with the sizes of the inner cavities of the pouring basin body 4 and the pouring basin cover 6;
2) firstly, spraying DR87 base coat on the cavity parts of the pouring basin body 4 and the pouring basin cover 6, wherein the thickness of the coat is 0.2-0.3mm, and then respectively coating fire-resistant fiber paste on the base coat to form heat-insulating layers, wherein the thickness of the first heat-insulating layer 5 is 15mm, and the thickness of the second heat-insulating layer 7 is 10 mm; respectively assembling the moulds, and baking at the temperature of more than 400 ℃ for 8-10h in a preheating furnace; taking out the heat-insulating layer from the preheating furnace, dismantling the mould, and brushing 100M of coating on the first heat-insulating layer 5 and the second heat-insulating layer 7, wherein the thickness of the coating is 0.6-1.0 mm;
3) fixing the pouring basin body 4 and the pouring basin cover 6 with the casting mold 10 by using bolts 9, and installing the pouring basin body and the pouring basin cover on a low-pressure casting machine;
4) when pouring is started, the equipment keeps the liquid level of molten metal 2 in the furnace 1 pressurized, and the molten metal 2 is pressed into the riser pipe 3 and passes through the pouring basin body 4, the pouring basin cover 6 and the pouring gate 8 to finally fill the cavity of the casting mold 10; in the whole process of filling, pressurizing and maintaining pressure, the first heat-insulating layer 5 and the second heat-insulating layer 7 are used for insulating the molten metal 2, so that the good feeding effect of the pouring gate 8 and the non-solidification of the molten metal 2 in the pouring gate basin body 4 are ensured;
5) after the liquid level of the molten metal 2 is decompressed, the molten metal 2 in the pouring basin body 4 flows back to the equipment holding furnace 1;
6) after the mold is opened, ejecting the casting by adopting an ejector rod, taking the casting, cleaning the mold, and closing the mold again for pouring;
7) repeating the steps 4) to 6) to continuously produce the casting;
8) after one round of production is finished, the mould is normally prepared again, the next round of production is prepared, the first heat-insulating layer 5 and the second heat-insulating layer 7 do not need to be replaced within the service life (about 1 ten thousand mould times), the cleaning is simple, and the mould can be manufactured again according to the step 2) after the service life is exceeded.
9) The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (6)
1. The heat-preservation pouring basin device for low-pressure casting is characterized by comprising a pouring basin unit which is detachably connected and arranged below a casting mold (10), wherein the bottom of the pouring basin unit is communicated with a liquid lifting pipe (3), and the liquid lifting pipe (3) is used for conveying metal liquid (2) which is externally pressed into the casting mold (10) through the pouring basin unit against the direction of gravity;
the pouring basin unit comprises a pouring basin body (4) and a pouring basin cover (6), the pouring basin cover (6) is connected and arranged above the pouring basin body (4) to jointly form a cavity for containing molten metal (2), a plurality of pouring gates (8) are arranged on the pouring basin cover (6), and the pouring basin body (4), the pouring basin cover (6) and a casting mold (10) are connected through bolts (9);
the pouring basin is characterized in that a first heat-insulating layer (5) is arranged on the inner wall of the pouring basin body (4), a second heat-insulating layer (7) is arranged on the inner wall of the pouring basin cover (6), and the thickness of the first heat-insulating layer (5) is larger than that of the second heat-insulating layer (7).
2. The heat-insulating pouring basin device for low-pressure casting according to claim 1, characterized in that the inner volume of the pouring basin body (4) is larger than the inner volume of the pouring basin cover (6).
3. The heat-insulating runner pot device for low-pressure casting according to claim 1, wherein the thickness of the first heat-insulating layer (5) is 14 to 16mm, and the thickness of the second heat-insulating layer (7) is 9 to 11 mm.
4. The insulated runner pot device for low-pressure casting according to claim 3, wherein the thickness of the first insulating layer (5) is 15mm, and the thickness of the second insulating layer (7) is 10 mm.
5. The heat-insulating runner pot device for low-pressure casting according to claim 1, wherein the cross-sectional shape of the runner (8) is an inverted trapezoid.
6. An insulated runner pot apparatus for low pressure casting according to claim 2, characterised in that the number of said runners (8) is at least 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122357013.2U CN216065485U (en) | 2021-09-27 | 2021-09-27 | Heat-preservation pouring basin device for low-pressure casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122357013.2U CN216065485U (en) | 2021-09-27 | 2021-09-27 | Heat-preservation pouring basin device for low-pressure casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113874136A (en) * | 2019-05-22 | 2021-12-31 | 本田技研工业株式会社 | Low-pressure casting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113874136A (en) * | 2019-05-22 | 2021-12-31 | 本田技研工业株式会社 | Low-pressure casting device |
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