KR101566873B1 - Screw conveyor type sand cooler - Google Patents

Screw conveyor type sand cooler Download PDF

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Publication number
KR101566873B1
KR101566873B1 KR1020150070403A KR20150070403A KR101566873B1 KR 101566873 B1 KR101566873 B1 KR 101566873B1 KR 1020150070403 A KR1020150070403 A KR 1020150070403A KR 20150070403 A KR20150070403 A KR 20150070403A KR 101566873 B1 KR101566873 B1 KR 101566873B1
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South Korea
Prior art keywords
molding sand
cooling
sand
moving pipe
solid coolant
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KR1020150070403A
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Korean (ko)
Inventor
이동열
김범진
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이동열
합자회사 대한금속
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Priority to KR1020150070403A priority Critical patent/KR101566873B1/en
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Publication of KR101566873B1 publication Critical patent/KR101566873B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw conveyor-type molding sand cooling apparatus for cooling and recovering a molding sand used in a casting operation, comprising: a cylindrical moving pipe for cooling a molding sand to cool the molding sand; A hopper provided to allow the molding sand to be introduced into the moving pipe; A screw blade installed inside the moving pipe to rotate the loaded molding sand; A mesh network capable of filtering and discharging the foundry sand moved from the screw; And a solid coolant for cooling the foundry sand when the foundry sand is moved through the moving pipe.
Accordingly, the screw conveyor-type molding sand cooling apparatus is characterized in that cooling of the molding sand can be efficiently performed in a simple and miniaturized form as compared with the existing water cooling and air-cooling molding sand cooling apparatuses.
Further, in producing the solid coolant, scrap is recycled, and is environmentally friendly.

Description

Screw conveyor type sand cooling device. {Screw conveyor type sand cooler}

The present invention can be applied to a simple moving machine including a hopper into which a casting yarn can be inserted into a cylindrical moving pipe, a screw blade for moving the casting yarn by rotation, a mesh net for draining and removing the moved sanding material, and a solid coolant for cooling the foundry sand in the moving pipe And more particularly to a screw conveyor-type molding sand cooling apparatus for efficiently cooling a molding sand in a compact form.

Further, the present invention relates to a screw conveyor-type molding sand cooling apparatus capable of cooling the foundry sand in an eco-friendly manner by recycling scrap iron in manufacturing a solid coolant.

The casting process is a method of injecting a molten metal into a certain mold and then solidifying the molten metal. The mold is classified into a mold and a mold according to a material widely used.

Since the casting method among the casting molds has a merit that it is inexpensive and easy to manufacture in terms of the manufacture of a mold compared with a casting method of a mold because it forms a mold through sand, it is used as the most general casting method, Sand used for manufacturing is called foundry sand.

The molding conditions of the foundry must satisfy the requirements of moldability, strength, fire resistance, chemical stability, air permeability and warmth, and it is necessary to cool the metal melt for rapid reuse because it absorbs hot heat during the solidification process of the metal melt.

In the conventional molding sand cooling apparatus, a method in which hot sand casting is supplied to a plurality of cooling pipes provided in a lateral direction or a plurality of cooling pipes through which a coolant flows, and then cooled and transferred through a blower fan or the like.

However, according to the above-described conventional technique, the inner surface of the cooling pipe is worn out excessively by transferring the molding sand through the blower fan.

Further, in the transfer of the molding sand through the blower fan, the contact between the cooling pipe and the foundry is narrow and uneven so that the cooling efficiency is low, and a large power ratio is generated due to the operation of the blower fan for transferring the molding sand.

In order to solve such a problem, in a chamber in which a cooling device using cooling water is formed, a large number of molding-material moving pipes are vertically formed, and a technique for dropping molding sand into the moving pipe is disclosed in Japanese Patent Publication No. 10-1063435.

Since the conventional technology allows the molding sand to pass through the cooling device and the plurality of moving pipes through a free fall, the power ratio is reduced and the cooling efficiency can be increased by increasing the contact area between the molding sand and the moving pipe.

However, since the conventional technique requires a large number of moving pipes, the volume of the chamber must be increased. Since the molding sand passes through the plurality of moving pipes by free fall, There arises a problem that the length of a plurality of moving pipes must be extremely long vertically.

On the other hand, a plurality of molding-material moving pipes are vertically formed in a chamber in which a cooling device using cooling water is formed, and a spiral blade is provided on the molding-material moving pipe so that the molding sand is rotated and cooled in the moving pipe through the blades Technology has been proposed in the Published Patent Application No. 10-2012-0076835.

In the above-described conventional technique, the above-mentioned blades are added to the moving pipe, so that the foundry sand can be rotated without falling freely, so that cooling can be efficiently performed.

Accordingly, the number of the moving pipes can be reduced, the length thereof can be shortened, and the volume of the cooling chamber can be prevented from being increased due to the increased cooling efficiency.

However, in the conventional technique, the blades must be provided in each of the plurality of moving pipes, and the cooling device must continuously supply the cooling water in the cooling chamber, so that the manufacturing is difficult due to the structural complexity. There arises a disadvantage in terms of volume.

Japanese Utility Model Utility Model No. 62-179147 (November 13, 1987) Patent Registration No. 10-1063435 (September 10, 2011) Open Patent Publication No. 10-2012-0076735 (July 10, 2012) Patent Registration No. 10-1428424 (2014.08.01)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a molding sand cooling apparatus that efficiently cools a molding sand without a large volume of the apparatus.

Another object of the present invention is to provide a molding sand cooling device which is easy to manufacture through a simple structure and is advantageous in terms of production cost.

It is also an object of the present invention to provide a molding sand cooling apparatus which is environmentally friendly by recycling scrap iron in a solid coolant for cooling molding sand.

In the present invention, there is provided a casting machine including a cylindrical moving pipe for cooling a molding sand, a hopper provided at an end of the moving pipe to allow the molding sand to be inserted, a screw blade provided inside the moving pipe, And a solid coolant provided at the opposite end of the moving pipe to mesh and discharge the molten sand removed from the screw blade and a solid coolant for cooling the foundry sand when the foundry sand is moved through the moving pipe. The present invention provides a screw conveyor type molding sand cooling apparatus.

In addition, in the provided screw conveyor type molding sand cooling apparatus, the hopper is divided into a molding material input port through which the molding sand can be input and a coolant input port into which the solid coolant can be input.

Further, in the provided screw conveyor type molding sand cooling apparatus, a foundry nets are added under the molding sand input port so that the molding sand can be filtered into the molding sand when the molding sand is input .

In addition, in the provided screw conveyor type molding sand cooling apparatus, the screw is connected to a rotation control unit for controlling the direction and speed of rotation.

Further, in the provided screw conveyor type molding sand cooling apparatus, the amount of the solid coolant is in the range of 45 to 55% by volume with respect to the amount of the molding sand charged into the moving pipe.

The casting screw cooling apparatus according to the present invention is advantageous in that it has a small volume and high cooling efficiency because it does not need to include a chamber for passing cooling water and a large number of casting movement pipes in the molding sand cooling apparatus.

In addition, since it has a very simple structure as compared with the conventional molding sand cooling apparatus, it also has advantages of manpower saving effect and material saving effect.

In addition, by recycling scrap iron and using it as a solid coolant, it has the advantage of being environmentally friendly.

1 is a perspective view showing a cooling process of a foundry sand according to an embodiment of the present invention;
FIG. 2 is a side perspective view showing a moving tube rotating through a moving tube rotating shaft according to an embodiment of the present invention; FIG.
3 is a perspective view illustrating a method of removing a solid coolant in an embodiment of the present invention.
4 is a perspective view showing a cooling process of a foundry sand according to another embodiment of the present invention;
5 is a side view showing the cooling of the solid coolant after cooling of the foundry sand according to one embodiment of the present invention.
6 is a perspective view illustrating cooling of a solid coolant after cooling of a foundry sand according to another embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided by way of example only so that those skilled in the art can fully understand the spirit of the present invention and the present invention is not limited to the embodiments described below But may be embodied in other forms without limitation.

In the drawings, the width, length, thickness, and the like of components are exaggerated for convenience. In the drawings, the same reference numerals are used throughout the specification to refer to the same or like parts. Represent the same components.

FIG. 1 is a perspective view showing a cooling process of a foundry sand 17 according to an embodiment of the present invention.

1, the present invention basically comprises a cylindrical moving tube 11 in which a molding sand 17 is cooled, a hopper 12 is provided at one end of the moving pipe 11, and a molding sand 17 ) To be able to input.

A screw blade 13 is provided to move the casting yarn 17 to the other end of the moving pipe 11 and a mesh net 14 is provided at the other end of the casting yarn 17, .

In addition, in the use of the screw conveyor type molding sand cooling apparatus of the present invention, the molding sand 17 is provided in the moving pipe 11 So as to be cooled.

The present invention is characterized in that the foundry yarn 17 is cooled through the above-described structure and the foundry yarn 17 is introduced into the casting yarn introduction opening 12a provided at one side of the hopper 12, The solid coolant 15 is introduced into the coolant inlet port 12b provided on the opposite side to the coolant inlet port 12b.

At this time, since the casting yarn 17 before cooling is finished after the casting operation, the residue after casting such as metal (hereinafter referred to as "residue") may exist in the casting yarn 17, The molding sand 17 may be inserted into the moving pipe 11 by sandwiching the molding sand 17 with the sandwiched net 12a '

At this time, in order to more completely filter the residues of the magnetic metal in the filtering of the residue, the foundry nets 12a 'are connected to the electromagnets so that the foundry sand 17 can pass through the casting mortar 12a' It is preferable that an electric current is applied to the electromagnets connected to the foundry sand nets 12a 'when passing therethrough so as to filter the magnetic residues which may pass through the casting mortar 12a'.

The casting yarn 17 that has been filtered and separated by the foundry nets 12a 'flows into the moving pipe 11 and flows into the moving pipe 11 through the coolant inlet 12b, I meet inside.

Thereafter, the casting yarn 17 and the solid coolant 15 start to rotate and move through the rotation of the screw blade 13 provided inside the moving pipe 11, Stirred and moved.

At this time, the screw blades 13 can rotate through the rotation of the screw shaft 13a, and the screw shaft 13a is fixed to the outside of both sides of the moving tube 11 by the screw fixing plate 13. [ So that the shaft can be rotated without being shaken.

A rotation regulating portion 13c is connected to one end of the screw shaft 13a to adjust the rotational speed of the screw shaft 13a to control the rotational speed of the screw shaft 13a, So that the cooling of the molding sand 17 can be controlled.

The rotational speed of the rotation adjusting unit 13c may be adjusted by providing a transmission within the rotation adjusting unit 13c.

In the present invention, illustration and description of the internal structure of the rotation regulating portion 13c are omitted because they can be easily understood by an ordinary user even if omitted.

The material of the moving pipe 11, the screw blade 13 and the screw shaft 13a is such that the molding sand 17 and the solid coolant 15 at a high temperature of about 300 ° C during the cooling process of the foundry sand 17, And at least one element selected from the group consisting of W, Cr, Co and V, which is excellent in hardness, abrasion resistance and toughness even at a high temperature, And most preferably 5% by weight of alloy steel for tools.

In the present invention, the heat transfer efficiency of the molding sand 17 varies depending on the volume percentage of the solid coolant 15 to be cooled.

The temperature of the foundry sand 17 is measured after the cooling process of the foundry sand 17 is carried out by changing the volume percentage of the solid coolant 15 to be charged by 30 to 70% Respectively.

Referring to Table 1, as the volume percentage of the solid coolant 15 is increased, the temperature of the foundry sand 17 decreases after the cooling of the foundry sand 17.

The temperature after cooling of the foundry sand 17 according to the volume percentage of the solid coolant 15 is set so that the temperature of the foundry sand 17 is increased by 10% until the volume percentage of the solid coolant 15 becomes 50% The temperature decrease is maintained at about 30 DEG C, and when the solid coolant 15 is 60% or more, the temperature reduction of the foundry sand 17 is reduced to 20 DEG C or less.

As a result, the heat transfer efficiency of the solid coolant 15 was 50% by volume, and the heat transfer efficiency, the amount of the solid coolant 15 to be used, and the cooling rate of the molding sand 17 The amount of the solid coolant 15 to be charged is most preferably 45 to 55% by volume in consideration of the recovered amount.

Solid coolant volume (%)
30% 40% 50% 60% 70% Bulk material volume (%)
70% 60% 50% 40% 30% Initial solid coolant temperature (캜)
20 ℃ 20 ℃ 20 ℃ 20 ℃ 20 ℃ Early foundry temperature (℃)
260 ℃ 260 ℃ 260 ℃ 260 ℃ 260 ℃ Solid coolant temperature after cooling (℃)
182 DEG C 167 ° C 148 DEG C 112 C 93 ℃ Casting temperature after cooling (℃)
219 ° C 185 ℃ 154 ℃ 137 ℃ 125 ℃

In the present invention, the solid coolant 15 to be stirred with the foundry sand 17 can be variously applied in shape and size. However, it is possible to prevent the clogging during the movement through the screw blade 13, A spherical shape is most preferable, and it is preferable that the size is as uniform as possible.

At this time, the size of the solid coolant 15 may be as small as possible in terms of heat transfer efficiency, but it is preferable that the solid coolant 15 is made larger than the distance between the screw blades 13 and the moving pipe 11, It is preferable to prevent the clogging phenomenon.

As the material of the solid coolant 15, it is preferable that the ratio of pure iron is high in consideration of the thermal conductivity shown in Table 2.

Therefore, when manufacturing the solid coolant 15 in the present invention, the choice of scrap metal to be recycled is such that the content of pure iron is at least 30 wt%, more preferably at least 50 wt%, based on the weight of the entire scrap metal.

In the selection of the scrap metal to be recycled, when the content of pure iron is less than 30% based on the weight of the entire scrap metal, the heat transfer efficiency may be reduced by 20% or more in the casting sand cooling process.

In addition, when the solid coolant 15 is manufactured, it is preferable to include a process of removing impurities from the molten scrap through a decarburizing operation or the like so that the weight percentage of the pure iron can be increased.

Thermal Conductivity by Material (kcal / m · h · ℃) Stainless steel CarbonSteel
(1.5 wt% C) CarbonSteel
(0.5 wt% C) Pure iron 10.416 31.248 46.872 62.496

The cooled foundry yarn 17 moved to the other end of the moving pipe 11 through the screw blade 13 after the casting yarn 17 and the solid coolant 15 are inserted into the mesh net 14 So that only the cooled molding sand is discharged to the outside of the moving pipe 11 and the solid coolant 15 can be left in the moving pipe and the cooling process of the molding sand 17 is completed .

2 is a side perspective view showing that the moving tube 11 is rotated through the moving tube rotating shaft 11a according to an embodiment of the present invention.

2, the moving tube 11 is provided with a moving tube rotating shaft 11a on the outer side of the center portion and the moving tube 11 is rotated with respect to the center shaft 11a 'through the moving tube rotating shaft 11a It can be tilted.

At this time, the bottom of the moving tube rotary shaft 11a is fixed, and the moving tube 11 can be rotated forward and backward with respect to the center axis shown in FIG.

Although illustration and description of the means for fixing the foot of the moving tube rotary shaft 11a are omitted, drawings and description thereof will be omitted because an ordinary user can easily understand the present invention.

The drawings and description of the connecting method of the center shaft 11a 'of the moving tube rotary shaft 11a and the moving tube 11 are omitted and the present invention can be easily understood by a general user. The description is omitted.

Through the tilting of the moving pipe 11 through the moving pipe rotary shaft 11a and the cooling process of the molding sand 17 through the rotation adjusting unit 13c for adjusting the rotating direction and the rotating speed of the screw blade 13 In addition to the speed control, the speed of the cooling process of the foundry sand 17 can be adjusted.

The residual casting yarn 17 which can not be discharged to the outside of the moving pipe 11 through the screw blade 13 can be discharged to the outside through the inclination of the moving pipe 11.

3 is an enlarged view showing a method of removing the solid coolant 15 from the moving pipe 11 after cooling the molding sand 17 according to an embodiment of the present invention.

3, after the cooling process of the molding sand 17 is finished, the foundry sand 17 is discharged to the outside of the moving pipe 11, and the solid coolant 15 is discharged to the inside of the moving pipe 11 It will accumulate.

Therefore, in order to cool the casting mold 17 at a later stage, the solid coolant 15 must be removed to the outside of the moving pipe 11, as shown in FIG. 3 in the form of a method 1. It is possible to remove the solid coolant 15 by allowing the mesh net 14 to be separated from the moving pipe 11 and to remove the solid coolant 15 in the mesh network 14 in the form of a method 2, The lid 14a is provided so that the solid coolant 15 that has not been discharged can be removed to the outside by opening the mesh net lid 14a.

4 is a perspective view illustrating a cooling process of the foundry sand 17 according to another embodiment of the present invention.

In the case of the embodiment of the present invention, the cooling process of the foundry sand 17 proceeds, and the solid coolant 15 has to be continuously accumulated.

Therefore, as shown in FIG. 3, after the cooling process of the foundry sand 17 is finished, the solid coolant 15 must be removed, so that the cooling process of the foundry sand 17 can not be continuous.

Further, due to accumulation of the solid coolant 15 during cooling of the molding sand 17, the rotation of the screw blade 13 may be blocked.

In another embodiment of the present invention, the opposite side of the end of the moving pipe 11 is of an open structure. After the cooling process of the molding sand 17, the molding sand and the solid coolant 15 are simultaneously moved So that it can be discharged to the outside of the outdoor heat exchanger 11 and a separate external mesh net 14 'is provided on the outside in order to separate the casting mold 17 and the solid coolant 15 discharged therefrom.

The foundry sand 17 is filtered under the external mesh net 14 'through the separate external mesh net 14' and the solid coolant 15 is separated through the coolant moving plate 14'a Can be recovered.

Accordingly, in the structure of another embodiment of the present invention, a continuous process can be performed in the cooling process of the foundry sand 17.

5 is a side view showing cooling of the solid coolant 15 after cooling of the molding sand 17, according to an embodiment of the present invention.

5, after the cooling process of the molding sand 17 is completed, the solid coolant 15 remains in the mesh net 14. At this time, the solid coolant 15 passes through the moving pipe rotary shaft 11a, 11 are inclined so that the mesh net 14 is inserted into the water tank 16 containing the cooling water 16a.

Accordingly, the solid coolant 15 existing in the mesh net 14 can be cooled by contacting the coolant 16a.

The solid coolant 15 is cooled by the cooling water 16a and is then removed from the mesh net 14 in the form of a method 1 or a method 2 as shown in Figure 3 to cool the subsequent molding sand 17 Can be reused in the process.

At this time, the solid coolant 15 moves to the coolant inlet port 12b to be recycled in the subsequent cooling process of the foundry sand 17, and is cooled again due to evaporation of the coolant 16a present on the surface .

Further, when the solid coolant 15 is recycled in the state where the cooling water 16a is present on the surface of the solid coolant 15, the residual heat of the solid coolant 15 is removed while evaporating, so that the cooling process of the foundry sand 17 can be assisted .

As a result, by cooling the solid coolant 15 through the cooling water 16a after cooling the molding sand 17, it is possible to reduce the time consumed until reuse of the solid coolant 15, Which is effective for the cooling process of the heat exchanger 17.

Fig. 6 is a perspective view showing the cooling of the solid coolant 15 after the cooling process of the molding sand 17, according to another embodiment of the present invention.

6, after the cooling process of the molding sand 17 is completed, the solid coolant 15 is introduced into the water tub 16 by the coolant moving plate 14'a, And cooling can be performed by the cooling water 16a contained in the water tank 16. [

Thereafter, in still another embodiment, the solid coolant 15 cooled in a similar manner as in the above embodiment is reused in the cooling process of the subsequent molding sand 17, and the solid coolant 15 Cooling effect of the solid coolant 15 during the movement of the solid coolant 15 due to evaporation of the coolant 16a present on the surface of the solid coolant 15 after the cooling of the solid coolant 15, This can be beneficial for the cooling process.

1 and FIG. 4, the moving pipe 11, the hopper 12, the screw blade 13, and the screw shaft 17 are rotated through the cooling process of the molding sand 17, It is preferable that the moving tube 11, the hopper 12, the screw blade 13 and the screw shaft 13a are separated from each other so that they can be replaced.

11: moving tube 11a: moving tube rotating shaft 11a ': center axis
12: hopper 12a: molding sand inlet 12a ': molding sand network 12b: coolant input port
13: Screw blades
13a: screw shaft 13b: screw fixing plate 13c:
14: mesh network 14a: mesh network cap
14 ': External mesh network 14'a: Coolant moving plate
15: solid coolant 16: water tank 16a: cooling water
17: foundry sand

Claims (7)

A cylindrical moving pipe 11 for cooling the foundry sand 17;
A hopper 12 provided at one end of the moving pipe 11 to allow the molding sand 17 to be inserted therein;
A screw blade (13) provided inside the moving pipe (11) and capable of rotating the loaded molding sand (17);
A mesh net (14) provided at the other end of the moving pipe (11) and capable of filtering and discharging the moved sanding yarn (17) from the screw blade (13);
And a solid coolant (15) for cooling the foundry sand (17) when the foundry sand (17) is moved through the moving pipe (11)
The hopper 12 is formed on one side thereof with a coolant inlet 12b through which the solid coolant 15 can be introduced on the opposite side of the molding sand inlet 12a into which the molding sand 17 is inserted A screw conveyor type molding sand cooling device.
delete The method according to claim 1,
Wherein the molding sand inlet (12a) is provided with a molding sand net (12a ') which can remove residues when the molding sand (17) is inserted.
The method according to claim 1,
Wherein the screw blade (13) is connected to a rotation regulating portion (13c) for regulating the direction and speed of the rotation of the screw conveyor.
The method according to claim 1,
Wherein the amount of the solid coolant (15) to be introduced is in the range of 45 to 55% by volume with respect to the amount of the molding sand (17) charged into the moving pipe.
The method according to claim 1,
The moving tube 11 is provided with a moving tube rotating shaft 11a on the outer side of the central portion and the moving tube 11 is tilted forward and backward with respect to the center axis 11a 'through the moving tube rotating shaft 11a And a cooling device for the molten metal of the casting conveyor.
The method of claim 6,
Wherein the other end of the moving pipe (11) rotated by the moving pipe rotary shaft (11a) is inserted into a water tank (16) provided with cooling water (16a) to cool the solid coolant (15).
KR1020150070403A 2015-05-20 2015-05-20 Screw conveyor type sand cooler KR101566873B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109226672A (en) * 2018-11-27 2019-01-18 荣成富邦金属科技有限公司 A kind of casting model powder cooling device
KR20200097022A (en) 2019-02-07 2020-08-18 주식회사 에코비젼21 Temperature Control Methods and Temperature Control Structure in Liner of Casting Separator
CN111673053A (en) * 2020-06-20 2020-09-18 东风精密铸造有限公司 Precision casting integrated form floats sand equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007169014A (en) 2005-12-26 2007-07-05 Nikko Co Ltd Hopper device with sieve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007169014A (en) 2005-12-26 2007-07-05 Nikko Co Ltd Hopper device with sieve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109226672A (en) * 2018-11-27 2019-01-18 荣成富邦金属科技有限公司 A kind of casting model powder cooling device
KR20200097022A (en) 2019-02-07 2020-08-18 주식회사 에코비젼21 Temperature Control Methods and Temperature Control Structure in Liner of Casting Separator
CN111673053A (en) * 2020-06-20 2020-09-18 东风精密铸造有限公司 Precision casting integrated form floats sand equipment
CN111673053B (en) * 2020-06-20 2021-12-31 东风精密铸造有限公司 Precision casting integrated form floats sand equipment

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