AU2021103881A4

AU2021103881A4 - Thermal Insulation Device and Method for Metal Materials

Info

Publication number: AU2021103881A4
Application number: AU2021103881A
Authority: AU
Inventors: Rijin CHENG; Hongwei NI; Bao WANG; Yi Wang; Hua Zhang; Jianan Zhou
Original assignee: Wuhan University of Science and Engineering WUSE; Wuhan University of Science and Technology WHUST
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2019-01-31
Filing date: 2021-07-05
Publication date: 2021-11-04
Anticipated expiration: 2028-01-20

Abstract

The invention provides a metal material insulation device, including a box body and an upper cover. The box body includes an inner lining for containing metal materials, an outer shell and a vacuum chamber. The upper cover includes the outer cover, the inner cover and the upper cover hollow cavity channel formed between the outer cover and the inner cover. The upper cover is sealed and connected with the box body to form the first sealing space for holding metal materials and the second sealing space arranged around the first sealing space, which improves the thermal insulation performance of the metal materials stored in the first sealing space. Insulation method of the invention: The cooling rate of metal materials can be adjusted by controlling / adjusting the vacuum degree in the second sealing space, and the mechanical properties of metal materials can be improved. The installation labor intensity of the vacuum insulation layer is reduced by dividing the vacuum chamber into several small vacuum chambers and assembling them according to the needs. By controlling / adjusting the cooling medium in the second sealing space, the cooling rate of the liquid metal in the first sealing space is adjusted to improve the quality of the metal ingot. 1/4 t00a 212 21la xx x as-xx-m-2x12a \\\\\\\\\\\\\\\\\\N\20a 121 a 122a i3g 10a 14a 112a 14a Figure I

Description

1/4

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THERMAL INSULATION DEVICE AND METHOD FOR METAL MATERIALS

Technical field

The invention relates to the metallurgical technology field, in particular to a metal

material heat insulation device and a heat insulation method suitable for the metal

material heat insulation device.

Background technology

In recent years, with the rapid development of China' s power industry, nuclear

industry and petrochemical industry, the demand for large forgings is increasing, and

the quality requirements of large forgings are also increasing.

At present, most of the ingots produced in the field of iron and steel metallurgy,

non-ferrous metals and mechanical casting industry in China are cast liquid metal into

ingot mold to obtain various ingots of different sizes. The disadvantages of traditional

methods are obvious : liquid metal condensation time is long, the heat dissipation

performance of ingot mold directly affects the defects of molten steel crystallization,

composition segregation, shrinkage cavity and crack. For example, it takes more than

thirty hours for a hundred tons ingot, resulting in the enrichment of low melting point,

low density elements or inclusions in the metal liquid at the solidification front. At the

same time, due to the influence of hot solute convection, the chemical composition in

different regions of the ingot is not uniform, resulting in macro segregation and micro

segregation. The mold design of ingot has a decisive influence on the temperature field

distribution of ingot, which directly affects the distribution of shrinkage porosity

defects in the ingot.

In the existing technology, in order to eliminate the internal shrinkage porosity of

the ingot, inhibit the ingot segregation, cracks and other defects, and improve the billet

yield of the ingot, the cooling methods such as air cooling, water cooling and air cooling

are generally used to accelerate the cooling of the solidification process. This is done

by casting the ingot mold into a pipe, which is used to accelerate the cooling of the ingot mold by passing water, air or gas through the pipe. However, the cooling effect of these methods is not good, and the production cost is high. At the same time, the thermal stress of the ingot mold increases sharply, which greatly reduces the life expectancy.

In addition, some steel grades need to consider the slow decrease of temperature

from the stacked slab of continuous casting line. Sometimes, due to the rapid decrease

of surrounding temperature, the edge of the slab is cooled faster, which affects the

quality of subsequent product processing. For the continuous casting plant without

insulation pit nearby, the environmental temperature control of metal materials that

need slow cooling is relatively unstable, resulting in poor performance of metal

materials after slow cooling.

In view of this, it is necessary to design an improved metal material insulation

device and the insulation method suitable for the metal material insulation device to

solve the above problems.

Invention content

The purpose of the invention is to provide a metal material heat insulation device

to improve the mechanical properties of metal materials and a heat insulation method

suitable for the metal material heat insulation device.

To achieve the purpose of the above invention, the invention provides a metal

material heat insulation device, including a box body and a cover. The box body

includes an inner liner for containing metal materials, an outer shell sleeved on the outer

periphery of the inner liner, and a vacuum cavity provided between the inner liner and

the outer shell. The upper cover comprises an outer cover, an inner cover connected

with the outer cover and an upper cover cavity channel formed between the outer cover

and the inner cover. The upper cover is sealed and connected with the box body to form

the first sealing space for the metal material and the second sealing space set around

the first sealing space.

Preferably, the metal material insulation device specified in claim 1 is characterized by the vacuum cavity having a cavity channel formed in the box body between the lining and the shell. The shell has a shell suction port and thefirst suction pipe set in the shell suction port. One end of the first suction pipe is connected with the cavity channel in the box body, and the other end is closed with a valve. The outer cover is provided with an outer cover suction port and a second suction pipe arranged in the outer cover suction port. One end of the second suction pipe is connected with the cavity channel in the upper cover, and the other end is closed with a valve.

Preferably, the bottom surface of the inner cover is sealed and connected with the

upper end surface of the inner lining to form the first sealing space. The bottom surface

of the outer cover is sealed and connected with the upper end surface of the shell to

form the second sealing space.

Preferably, the outer edge of the inner cover is provided with a first step surface,

and the corresponding position of the upper surface of the lining is provided with a

second step surface matching the first step surface. The outer edge of the cover is

provided with a third step surface, and the corresponding position of the upper surface

of the shell is provided with a fourth step surface matching the third step surface.

Preferably, the outer cover is fixedly connected with the bottom of the inner cover,

and the outer shell is fixedly connected with the top of the inner lining. The bottom of

the upper cover is provided with a positioning block protruding in the direction of the

box body, and the corresponding position of the upper end face of the box body is

provided with a positioning groove containing the positioning block.

Preferably, at least one supporting foot is arranged on the inner lining, which

extends from the bottom wall of the inner lining to the shell and contacts with the shell.

Preferably, the lining is provided with at least one supporting foot extending from

the bottom wall of the lining to the shell and contacting the shell.

Preferably, the vacuum chamber is composed of several small vacuum chambers.

The small vacuum cavity is fitted and fixed on the shell. The small vacuum cavity

comprises a perimeter wall, an upper cover and a lower cover connecting the perimeter wall at the upper end face and the lower end face respectively, and a sealed cavity surrounded by the upper cover and the lower cover and the perimeter wall around.

Preferably, there is a pumping hole on the circumference wall of a single small

vacuum cavity.

Preferably, optimally, the outer cover and the inner cover are set in a flat shape, or

the outer cover and the inner cover are arc-shaped.

In order to realize the purpose of the invention, the invention also provides a heat

preservation method, which is applicable to the metal material heat insulation device

referred to in any of the above technical schemes. The heat insulation method comprises

the following steps:

insulation method, which is applicable to the metal material heat insulation device

the following steps: the heat insulation method includes the following steps: the metal

material that needs slow cooling after heat treatment is put into the metal material heat

insulation device, and the upper cover is combined with the box body cover. The

cooling rate of the metal material is adjusted by controlling the vacuum degree in the

cavity channel and / or the cavity channel in the upper cover.

Preferably, the pressure value range of the cavity duct in the box body and / or the

cavity duct in the upper cover is 1 x 10-' ~1 x 10 Pa.

Preferably, the metal material is one or more of steel, copper or aluminum.

insulation method, which is suitable for the metal material heat insulation device

mentioned in any of the above technical schemes. The heat insulation method includes

the following steps: the cooling rate of the metal material is adjusted by controlling

the cooling medium in the cavity of the box body and / or in the cavity of the upper

cover.

Preferably, the metal material heat insulation device is metal liquid solidification

device, which is used for the cooling and solidification of metal liquid.

Preferably, the cooling medium included but not limited to water or compressed

gas.

Preferably, the cooling medium is water and the flow rate ranges from 1to 30 t/

h.

Preferably, the cooling medium is compressed gas, and the flow rate range of the

compressed gas is 50 ~ 1000 L / min.

Preferably, the metal liquid is one or more of the aluminum liquid, copper liquid

or steel liquid.

Beneficial Effects

The metal material thermal insulation device in the invention realizes the

formation of the second sealing space set in the first sealing space when the upper cover

and the box body cover are closed by setting the cavity passage in the box body and the

cavity passage in the upper cover, which improves the thermal insulation performance

of the metal material in the first sealing space.

The metal material insulation device of the invention divides the vacuum chamber

into several small vacuum chambers. The small vacuum chamber is made and

vacuumized, and then the small vacuum chamber is transported to the production site

and fixed on the shell of the device, which greatly reduces the installation labor intensity

of the vacuum insulation layer.

The heat insulation method of the invention can adjust the cooling rate of metal

materials by controlling / adjusting the vacuum degree in the second sealing space,

which can adapt to the slow cooling requirements of metal materials in different

environments. Without heat insulation pits, the heat transfer uniformity of temperature

field in the slow cooling process of metal materials is higher, which is conducive to avoiding the risk of segregation, cracking and abnormal deformation of metal materials during high temperature quenching, and improving the mechanical properties of metal materials.

The heat insulation method of the invention adjusts the cooling rate of the metal

liquid in the first sealing space by controlling / adjusting the cooling medium in the

second sealing space to make the metal liquid crystallize, thereby reducing the central

segregation and central porosity of the metal ingot and improving the quality of the

metal ingot.

Description of Drawings

Figure 1 is the structure diagram of the first implementation mode of the metal

material insulation device.

Figure 2 is the decomposition of Figure 1.

Figure 3 is the structure diagram of the second implementation mode of the metal

material insulation device.

Figure 4 is the local amplification of region I in Figure 3.

Fig. 5 shows the structural diagram of the third implementation mode of the metal

material insulation device.

Fig. 6 shows the structural diagram of the small and medium vacuum chamber in

Fig. 5.

Attached Graph Marks

100a - Metal material heat insulation device. 10a - Box body. 11a - Inner lining. 111a - second step surface. 112a - Support foot. 12a - Shell. 121a - Shell suction port.

122a - First suction pipe. 123a - fourth step surface. 13a - cavity channel in the box

body. 14a - Universal roller. 20a - upper cover. 21a - outer cover. 211a - Outer cover

suction port. 212a - Second suction pipe. 213a - third step surface. 22a - Inner cover.

221a - first step surface. 23a - upper cover cavity channel.

100b - Metal liquid solidification device. lOb - Box body. 1Ib - Ingot mold. 12b

- Shell. 121b - Shell suction port. 122b - First suction pipe. 13b - Cavity channel in

the box body. 14b - Connection board. 141b - Positioning groove. 20b - Insulation

cover. 21b - Outer cover. 211b - Outer cover suction port. 212b - Second suction

pipe. 22b- Inner cover. 23b- Floor. 231b- Positioning block. 24b- Upper cover

cavity.

100c - Metal material heat insulation device. 1Oc - Box body. 1Ic - Lining. 12c

Shell. 20c- Upper cover. 5c- Vacuum cavity. 51c- Small vacuum chamber. 511c

Wall. 512c - Closed cavity. 513c - Upper cover. 514c - Lower cover. 515c - Suction

hole.

Specific Embodiments

In order to make the purpose, technical scheme and advantages of the invention

clearer, the following illustration and specific implementation examples are used to

describe the invention in detail.

It should also be noted that in order to avoid blurring the invention due to

unnecessary details, the attached figure only shows the structure and / or processing

steps closely related to the invention scheme, and omits other details that have little

relationship with the invention.

In addition, it should be noted that the term 'includes', 'contains' or any other

variant is intended to cover non-exclusive inclusion, so that the process, method, article

or equipment that includes a series of elements not only includes those elements, but

also includes other elements that are not clearly listed, or also includes elements

inherent in such process, method, article or equipment.

In the first embodiment, see Figures 1 to 2. The invention provides a metal material

insulation device for 100 a, including a box body 10 a and an upper cover 20 a fitted

above the box body 10 a. Box body 10a comprises an inner liner 11a for metallic

materials, a outer casing 12a set around the inner liner 11a and a cavity channel 13a

formed between the inner liner 11a and the outer casing 12a. The casing 12a is provided

with the casing suction port 121a and the first suction pipe 122a arranged in the casing suction port 121a. One end of the first suction pipe 122a is connected with the cavity channel 13a in the box body, and the other end is closed with a valve.

The upper cover 20a includes the outer cover 21a, the inner cover 22a connected

with the outer cover 21a and the upper cover cavity channel 23a formed between the

outer cover 21a and the inner cover 22a. The outer cover 21a has the outer cover suction

port 211a and the second suction pipe 212a set in the outer cover suction port 211a. One

end of the second suction pipe 212a is connected with the cavity channel 23a in the

upper cover, and the other end is closed with a valve. In this way, when the upper cover

a is covered on the box body 10a, the first sealing space for the metal material and

the second sealing space around the first sealing space are formed within the inner

lining 11a.

The outer cover 21a and the inner cover 22a are set in a flat shape, and the inner

cover 22a is placed inside the outer cover 21a, forming the upper cover cavity channel

23a. In particular, the outer edge of the inner cover 22a is provided with the first step

surface 221a, and the corresponding position of the upper surface of the inner liner 11a

is provided with the second step surface 111a matching the first step surface 221a.

Specifically, the inner cover 22a faces the surface of the inner liner 11a with the step

surface of the inner sag, and the inner liner 11a has the step surface protruding outward.

The two match each other to realize the sealing connection between the bottom surface

of the inner cover 22a and the upper end face of the inner liner 11a to form the first

sealing space.

The outer edge of the cover 21a is provided with the third step surface 213a, and

the corresponding position of the upper surface of the shell 12a is provided with the

fourth step surface 123a matched with the third step surface 213a. Specifically, the

surface of the outer cover 21a facing the outer shell 12a has a step surface with an

inward depression, and the step surface protruding outwards on the outer shell 12a. The

two cooperate with each other to realize the sealing connection between the bottom of

the outer cover 21a and the upper end face of the outer shell 12a to form the second

sealing space.

It should be noted that the position and protrusion direction of the first step surface

221a, the second step surface 1lla, the third step surface 213a, and the fourth step

surface 123a are not limited by this, and only the corresponding sealing between the

two is needed.

It should also be noted that the number of outer cover vent 211 a and outer shell

vent 121 a can be set to two or more according to product design requirements,

specifically without restrictions. The number of the first suction pipe 122a and the

second suction pipe 212a can be set according to the number of suction ports.

In particular, there are three supporting feet 112a which extend from the bottom

wall of lining 11a to the direction of shell 12a and contact with shell 12a on lining 11a.

Optimally, three supporting feet 112a were evenly distributed on the bottom wall of

lining 11a. This setting can support and reinforce the lining 11a, prevent the cavity

channel 13a from breaking when the lining 11a sinks, and prolong the service life of

the metal material insulation device for 100a. Of course, a supporting foot can also be

set at the center of lining 11a.

The thickness of cavity channel 13a in the box body and cavity channel 23a in the

upper cover ranges from 10 mm to 80 mm. The thickness of the two can be the same or

different, specifically not limited.

Preferably, the bottom of box body 10a is equipped with universal roller 14a. In

this way, it is convenient to move the metal material heat insulation device for 100 years,

which is suitable for the slow cooling requirements of metal materials at different

positions, increases convenience, expands the scope of use, and saves manpower.

When the metal material needs to be cooled slowly after heat treatment, it is put

into the lining 11a of the metal material insulation device for100a, and the upper cover

a is buckled with the box body 1Oa. The outer shell suction mouth 121a is connected

with one end of the first suction pipe 122a, and the vacuum pump is connected with the

other end of the first suction pipe 122a.

Then, the cavity channel 13a in the box body is vacuumed by the vacuum pump, so that the value range of the internal pressure of the cavity channel 13a in the box body is 1 x 10 - ' ~ 1x10 Pa. Then close the first suction tube 122a. The second suction pipe 212a is connected to the outer cover suction port 211a, and the vacuum pump is connected to the second suction pipe 212a. The vacuum pump was used to vacuumize the upper cover cavity channel 23a, so that the value range of internal pressure in the upper cover cavity channel 23a was 1 x 10 -3~ 1 X 105 Pa, and then the second suction pipe 212a was closed.

The invention also provides a heat insulation method for the metal material heat

insulation device. The heat insulation method puts the metal material that needs slow

cooling after heat treatment into the metal material heat insulation device 100a, and

covers the upper cover 20a and the box body 1Oa. The cooling rate of the metal material

is adjusted by controlling the vacuum degree of the cavity channel 13a in the box body

and the upper cover cavity channel 23a.

Among them, the vacuum degree of cavity channel 13a in the box body and cavity

channel 23a in the upper cover ranges from 5 Pa to 1000 Pa. Metal materials are one or

more of steel, copper or aluminum. See the following implementation cases 1 to 11 for

details.

Embodiment 1

In this implementation, the thickness of the hollow cavity of the metal material

heat insulation device 100a (the cavity channel 13a in the box body and the upper cover

cavity channel 23a) is 50mm.

After heat treatment, the cross section that needs slow cooling is a round billet

with a diameter of 500mm and a material of 40Cr hot billet. Put it into the inner lining

11a of the metal material insulation device 100a, button the upper cover 20a and the

box body 10a, and connect the suction port 121a of the shell with one end of the first

suction pipe 122a. The vacuum pump is connected with the other end of the first suction

pipe 122a, and then the cavity channel 13a in the box body is vacuumed to 50Pa through

the vacuum pump, and then the first suction pipe 122a is closed. Connect the second suction pipe 212a to the suction port 211a of the outer cover, and the vacuum pump with the second suction pipe 212a, vacuum the cavity channel 23a of the upper cover through the vacuum pump to 50Pa, then close the second suction pipe 212a.

After testing, the central porosity and central segregation of the hot billet in this

implementation case were all controlled below grade 1.5, and the proportion of grade

< 1.0 reached 98.1%. The elongation rate was 10.1%, compared to 3.7% after slow

cooling of the heat insulation pit, and the elongation rate of the implementation example

increased by 173 %.

Embodiment 2

cavity channel 23a) is 10mm.

pipe 122a, and then the cavity channel 13a in the box body is vacuumed to 5Pa through

the vacuum pump, and then the first suction pipe 122a is closed. Connect the second

suction pipe 212a to the suction port 211a of the outer cover, and the vacuum pump

with the second suction pipe 212a, vacuum the cavity channel 23a of the upper cover

through the vacuum pump to 5Pa, then close the second suction pipe 212a.

< 1.0 reached 98.9%. The elongation rate was 10.5%, compared to 4.1 % after slow

increased by 149%.

Embodiment 3

cavity channel 23a) is 80mm.

pipe 122a, and then the cavity channel 13a in the box body is vacuumed to 100Pa

through the vacuum pump, and then the first suction pipe 122a is closed. Connect the

second suction pipe 212a to the suction port 211a of the outer cover, and the vacuum

pump with the second suction pipe 212a, vacuum the cavity channel 23a of the upper

cover through the vacuum pump toI 0OPa, then close the second suction pipe 212a.

< 1.0 reached 97.2%. The elongation rate was 9.8%, compared to 3.5% after slow

increased by 180%.

Embodiment 4

insulation device 100a (the cavity channel 13a in the box body and the upper cover

cavity channel 23a) is 50mm.

The material to be cooled slowly after heat treatment is Q345, and the height to

diameter ratio is 200mm*200mm hot square billet. Put it into the inner lining 11a of the

metal material heat insulation device 100a, button the upper cover 20a and the box body

1Oa, and connect the suction port 121a of the shell with one end of thefirst suction pipe

122a. The vacuum pump is connected with the other end of the first suction pipe 122a,

and then the cavity channel 13a in the box body is vacuumed to 200Pa through the vacuum pump, and then the first suction pipe 122a is closed. Connect the second suction pipe 212a to the suction port 211a of the outer cover, and the vacuum pump with the second suction pipe 212a, vacuum the cavity channel 23a of the upper cover through the vacuum pump to 200Pa, then close the second suction pipe 212a.

< 1.0 reached 96.8%. The elongation rate was 9.9%, compared to 3.8% after slow

increased by 161%.

Embodiment 5

cavity channel 23a) is 10mm.

a, and connect the suction port 121a of the shell with one end of the first suction pipe

and then the cavity channel 13a in the box body is vacuumed to 100Pa through the

vacuum pump, and then the first suction pipe 122a is closed. Connect the second suction

pipe 212a to the suction port 211a of the outer cover, and the vacuum pump with the

second suction pipe 212a, vacuum the cavity channel 23a of the upper cover through

the vacuum pump toI 0OPa, then close the second suction pipe 212a.

< 1.0 reached 96.5%. The elongation rate was 9.6%, compared to 3.5% after slow

increased by 174%.

Embodiment 6

insulation device 100a (the cavity channel in the box body 13a and the upper cover

cavity channel 23a.) is 80mm.

metal material insulation device 100a, button the upper cover 20a and the box body 1Oa,

and connect the shell suction port 121a with one end of the first suction pipe 122a. The

vacuum pump is connected with the other end of the first suction pipe 122a, and then

the cavity channel 13a of the box body is vacuumed to 500Pa through the vacuum pump,

and then the first suction pipe 122a is closed. Connect the second suction pipe 212a to

the outer cover suction port 211a, and the vacuum pump with the second suction pipe

212a, vacuum the upper cover cavity channel 23a through the vacuum pump to 500Pa,

then close the second suction pipe 212a.

< 1.0 reached 97.1%. The elongation rate was 9.0%, compared to 3.7% after slow

increased by 143%.

Embodiment 7

cavity channel 23a) is 50mm.

After heat treatment, the hot slab with length of 10000mm, width of 1000mm and

thickness of 150mm, made of Q235, which needs slow cooling, is put into the inner

lining 11a of the metal material insulation device 100a. Button the upper cover 20a and

the box body 10a, and connect the shell suction port 121a with one end of the first

suction pipe 122a. The vacuum pump is connected with the other end of the first suction pipe 122a, and then the cavity channel 13a of the box body is vacuumed to 800Pa through the vacuum pump, and then the first suction pipe 122a is closed. Connect the second suction pipe 212a to the outer cover suction port 211a , and the vacuum pump with the second suction pipe 212a, vacuum the upper cover cavity channel 23a through the vacuum pump to 800Pa, then close the second suction pipe 212a.

< 1.0 reached 95.5%. The elongation rate was 8.9%, compared to 3.5% after slow

increased by 154%.

Embodiment 8

cavity channel 23a) is 10mm.

After heat treatment, the hot slab with length of 10000mm, width of 1000mm and

pipe 122a, and then the cavity channel 13a of the box body is vacuumed to 500Pa

second suction pipe 212a to the suction port 211a of the outer cover, and the pump with

the second suction pipe 212a, vacuum the upper cover cavity channel 23a through the

vacuum pump to 500Pa, then close the second suction pipe 212a.

< 1.0 reached 96.3%. The elongation rate was 9.0%, compared to 3.7% after slow

cooling of the heat insulation pit, and the elongation rate of the implementation example increased by 143%.

Embodiment 9

cavity channel 23a.) is 80mm.

After heat treatment, the hot slab with length of 10000mm, width of 1000mm and

pipe 122a, and then the cavity channel 13a of the box body is vacuumed to 1000Pa

vacuum pump to 100OPa, then close the second suction pipe 212a.

< 1.0 reached 94.6%. The elongation rate was 8.5%, compared to 3.6% after slow

increased by 136%.

Embodiment 10

cavity channel 23a) is 50mm.

Put the metal copper that needs slow cooling after heat treatment into the inner

suction pipe 122a. The vacuum pump is connected with the other end of the first suction pipe 122a, and then the cavity channel 13a of the box body is vacuumed to 1000Pa through the vacuum pump, and then the first suction pipe 122a is closed. Connect the second suction pipe 212a to the suction port 211a of the outer cover, and the pump with the second suction pipe 212a, vacuum the upper cover cavity channel 23a through the vacuum pump to 1000Pa, then close the second suction pipe 212a.

< 1.0 reached 98.6%.

Embodiment 11

cavity channel 23a.) is 50mm.

Put the metal aluminum that needs slow cooling after heat treatment into the inner

the box body 10a, and connect the exhaust port 121a of the shell with one end of the

first exhaust pipe 122a. The vacuum pump is connected with the other end of the first

suction pipe 122a, and then the cavity channel 13a of the box body is vacuumed to 50Pa

cover through the vacuum pump to 50Pa, then close the second suction pipe 212a.

< 1.0 reached 99.2%.

It can be seen that the metal material insulation device in this implementation

mode for 100 a adjusts the cooling rate of metal materials by adjusting the vacuum

degree in the second sealing space, which avoids the risk of segregation, cracking and

abnormal deformation of metal materials during high temperature quenching, and improves the mechanical properties of metal materials, with small segregation and uniform hardness distribution. It can meet the slow cooling requirements of different metal materials, so that the temperature field heat transfer uniformity in the process of slow cooling of metal materials is higher, which is beneficial to eliminate the dendritic segregation of metal materials and improve the quality of metal materials. It is suitable for slow cooling requirements of all tonnage metal materials with wide application range, simple process, reliable safety, low investment and maintenance cost.

The structure is simple; the design is reasonable; the movement is convenient; does not

need the heat insulation pit. It can satisfy the slow cooling metal material to the

environment temperature request, and the metal material environment temperature

control is simple. The slow cooling metal material each aspect performance is higher,

which improves the subsequent product processing quality. The metal material

insulation device is also easy to store and save space and cost. In the second way, please

refer to Figure3 to Figure4, the metal material insulation device is a metal liquid

solidification device100b for cooling and solidification of metal liquid. The metal liquid

solidification device 100b includes the box body 10b and the insulation cover 20b

which is suitable for the box body 10b. Insulation cover 20b includes inner cover 22b

and outer cover 21b. The outer cover 21b and the inner cover 22b are arc-shaped, and

the two are connected by the floor 23b seal, forming the upper cover cavity channel 24b

between the outer cover 21b and the inner cover 22b. The outer cover 21b is also

provided with the outer cover suction port 211b, and the second suction pipe 212b is

set in the outer cover suction port 211b. One end of the second suction pipe 212b is

connected to the cavity channel 24b in the upper cover, and the other end is closed with

a valve. In particular, the bottom of the floor 23b is provided with a positioning block

231b protruding to the direction of box body Ob.

Box body lOb includes ingot mold 1lb containing metal liquid and shell 12b set

around ingot mold 1b. The ingot mold 1lb and the top of shell 12b are sealed by the

connecting plate 14b to form the cavity channel 13b in the box body between the ingot

mold 1lb and the shell 12b. The shell 12b is equipped with the shell suction port 121b and the first suction tube 122b set within the shell suction port 121b. One end of the first suction pipe 122b is connected with the cavity channel 13b in the box body, and the other end is closed with the valve. In particular, there is a height difference between the upper end face of the connecting plate 14b and the ingot mold 1lb and the upper end face of the shell 12b, forming a positioning groove 141b corresponding to the position of the positioning block 231b.Therefore, when the insulation cover 20b and the box body 10b are closed, the positioning block 231b is placed in the positioning groove 141b, and the side walls of the two are connected to each other to achieve a stable connection. In the ingot mold 1Ib, the first sealing space filled with metal liquid and the second sealing space surrounded by the first sealing space are formed.

It should also be noted that there are other ways to seal the connection between

the box body lOb and the insulation cover 20b, which should not be limited.

The invention also provides an insulation method. The insulation method puts the

metal liquid into the metal liquid solidification device 100b, and the insulation cover

b is combined with the cover of the box body 10b. The cooling rate of the metal

material is adjusted by controlling the cooling medium in the cavity channel 13b of the

box body and the cavity channel 24b of the upper cover.

The cooling medium includes but is not limited to water or compressed gas.

Preferably, the optimum cooling medium is water, and the flow rate ranges from 1

to 30 t/h.

Preferably, the cooling medium is compressed gas, compressed gas flowed range

of 50~1000L/min.

or steel liquid.

The following examples are combined with implementation cases 12 to 25 to

illustrate the insulation method:

Embodiment 12

The thickness of cavity channel 13b in the box body and 24b in the upper cover is

40mm.

Casting of a single 15 tonne Q345B steel grade octagonal ingot, insulation

methods are as follows:

The Q345B steel octagonal liquid steel was injected into the first sealing space of

the ingot mold 11b of the metal liquid solidification device, and the insulation cover

b was buckled with the ingot mold 1lb. Then the vacuum pump suction port is

connected with the outer shell suction port 121b through the first suction pipe 122b to

vacuum the cavity channel 13b in the box body, and the second suction pipe 212b is

connected with the outer cover suction port 211b to vacuum the cavity channel 24b in

the upper cover. When the vacuum degree of the cavity channel 13b in the box body

and the cavity channel 24b in the upper cover is pumped to 100 Pa, the valve is turned

off, and the insulation cover is removed after 15 h, and the mold is removed and the

ingot is suspended.

Compared with conventional casting, the grades of defects such as central

segregation and central porosity of the ingot in this implementation case were all

controlled below 1.0, the rating ratio of 1.5 grade being reduced from 8.33% to 0, the

rating ratio of 1.0 grade being reduced from 50% to 33.5%, the rating ratio of 0.5 grade

being increased from 41.76% to 66.5%. The deformation of the ingots 0.065 mm, and

the tensile strength is 350 MPa. The yield strength is 375 MPa, and the elongation is

0.72%. The quality of the ingot is improved.

Embodiment 13

5mm.

Casting of a single 15 tonne Q345B steel grade octagonal ingot, insulation

methods are as follows:

the ingot mold 1lb, and the insulation cover 20b was buckled with the ingot mold 1lb.

Then the vacuum pump suction port was connected with the outer shell suction port

121b through the first suction pipe 122b to vacuum the cavity channel 13b in the box

body, and the second suction pipe 212b was connected with the outer cover suction port

21lb to vacuum the cavity channel 24b in the upper cover. When the vacuum degree of

the cavity channel 13b in the box body and the cavity channel 24b in the upper cover

was pumped to 0.1 Pa, the valve was turned off, and the insulation cover was removed

after 20 h, and the mold was removed and the ingot was suspended.

Compared with conventional casting, the grades of defects such as central

controlled below 1.5, the rating ratio of 2.0 grade was reduced from 5.6% to 0, the

rating ratio of 1.5 grade was reduced from 25% to 4.2%, the rating ratio of 1.0 grade

was reduced from 50% to 33.33%, and the rating ratio of 0.5 grade was increased from

19.4% to 62.47%. The deformation of the ingot was 0.068 mm, the tensile strength was

346 MPa, the yield strength was 372 MPa, and the elongation was 0.76%. The quality

of the ingot was improved.

Embodiment 14

60mm.

Casting of a single 15 tonne Q345B steel grade octagonal ingot, insulation

methods are as follows :

the ingot mold 1Ib, and the insulation cover 20b was buckled with the ingot mold 1lb.

was pumped to 1000 Pa, the valve was turned off, and the insulation cover 20b was removed after 10 h, and the mold was removed and the ingot was suspended.

Compared with conventional casting, the grades of defects such as central

controlled below 1.5 grade, the rating ratio of 2.0 grade was reduced from 6.4% to 0,

the rating ratio of 1.5 grade was reduced from 25% to 5.6%, the rating ratio of 1.0 grade

was reduced from 50% to 35.8%, and the rating ratio of 0.5 grade was increased from

18.6% to 58.6%. The deformation of the ingot was 0.075 mm, the tensile strength was

342 MPa, the yield strength was 365 MPa, and the elongation was 0.75%. The quality

of the ingot was improved.

Embodiment 15

The difference between the implementation case and the implementation case 12

is that the 15 - ton Q345B steel octagonal ingot with single weight is cast, and the heat

insulation method is as follows: The octagonal liquid steel of Q345B steel was injected

into the first sealing space of ingot mold 1Ib, and the insulation cover 20b was buckled

with ingot mold 1lb. The first suction pipe 122b was connected with the shell suction

port 121b, and the second suction pipe 212b was connected with the outer cover suction

port 211b. The cooling water valve was opened to cool the water in the middle cavity

channel 13b of the box body and the middle cavity 24b of the upper cover. The cooling

water flow was 1-30 t / h. After 10 h, the insulation cover 20b was removed, the mold

was demolded and the ingot was suspended.

Compared with conventional casting, the grades of defects such as central

controlled below 1.5 grade, the rating ratio of 2.0 grade was reduced from 7.5% to 0,

the rating ratio of 1.5 grade was reduced from 25% to 7.2%, the rating ratio of 1.0 grade

was reduced from 50% to 45. 9 %, and the rating ratio of 0.5 grade was increased from

1 7 .5% to 4 6 . 9 %. The deformation of the ingot was 0.15 mm, the tensile strength was

320 MPa, the yield strength was 340 MPa, and the elongation was 1.15%. The quality

of the ingot was improved.

Embodiment 16

The difference between the implementation case and the implementation case 12

is that the 15 -ton Q345B steel octagonal ingot with single weight is cast, and the heat

insulation method is as follows: the Q345B steel octagonal liquid is injected into the

first sealing space of the ingot mold 1Ib, and the heat insulation cover 20b is buckled

with the ingot mold 1lb. The compressed air is injected into the cavity channel 13b in

the box body and the cavity channel 24b in the upper cover respectively through the

first extraction tube 122b and the second extraction tube 212b, and the compressed air

flow is controlled at 100 - 1000 L/min. After 10 h, the heat insulation cover 20b is

removed, the mold is removed, and the ingot is suspended.

Compared with conventional casting, the grades of defects such as central

controlled below 1.5 grade, the proportion of evaluation grade < 1.0 grade reaches

91.1%, The deformation of the ingot was 0.095 mm, the tensile strength was 335 MPa,

the yield strength was 342 MPa, and the elongation was 0.96%. The quality of the ingot

was improved.

Embodiment 17

The difference between the implementation case and the implementation case 12

with the ingot mold 1lb. The compressed helium is injected into the cavity channel 13b

in the box body and the cavity channel 24b in the upper cover respectively through the

first extraction tube 122b and the second extraction tube 212b, and the compressed

helium flow is controlled at 50 - 100 L/min. After 10 h, the heat insulation cover 20b

is removed, the mold is removed, and the ingot is suspended.

Compared with conventional casting, the grades of defects such as central

segregation and central porosity of the ingot in this implementation case were all controlled below 1.5, the proportion of evaluation grade 5 1.0 grade reaches 94.3 %,

The deformation of the ingot was 0.083 mm, the tensile strength was 362 MPa, the yield

strength was 359 MPa, and the elongation was 0.81 %. The quality of the ingot was

improved.

Embodiment 18

40mm.

Casting metal liquid is aluminum liquid, the insulation method is as follows:

The aluminum liquid was injected into the first sealing space of the ingot mold

1Ib, and the insulation cover 20b was buckled with the ingot mold 1lb. Then the

vacuum pump suction port is connected with the outer shell suction port 121b through

the first suction pipe 122b to vacuum the cavity channel 13b in the box body, and the

second suction pipe 212b is connected with the outer cover suction port 211b to vacuum

the cavity channel 24b in the upper cover. When the vacuum degree of the cavity

channel 13b in the box body and the cavity channel 24b in the upper cover is pumped

to 1-100 Pa, the valve is turned off, and the insulation cover 20b is removed after 20 h,

and the mold is removed and the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

and central porosity of the aluminum ingot in this implementation case are all controlled

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 98.6%, and the

quality of aluminum ingot is improved.

Embodiment 19

The difference between this implementation case and the implementation case 18

is that the aluminum liquid is injected into the first sealing space of ingot mould 1Ib,

and the insulation cover 20b is buckled with ingot mould 1lb. The first suction pipe

122b is connected with the shell suction port 121b, and the second suction pipe 212b is

connected with the outer cover suction port 21lb. The cooling water valve is opened to

cool the water in the cavity channel 13b of the box body and the middle cavity 24b of the upper cover. The cooling water flow is 1 - 30 t/h. After 20 h, the insulation cover b is removed, the mould is demoulded and the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 90.2%, and the

quality of aluminum ingot is improved.

Embodiment 20

The difference between this implementation case and the implementation case 18

is that the aluminum liquid is injected into the first sealing space of the ingot mould

1Ib, and the heat insulation cover 20b is buckled with the ingot mould 1lb. The

compressed air is injected into the cavity channel 13b in the box body and the cavity

channel 24b in the upper cover respectively through the first extraction tube 122b and

the second extraction tube 212b, and the compressed air flow is controlled at 100 - 150

L/min. After 20 h, the heat insulation cover 20b is removed, the mould is removed, and

the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 90.6%, and the

quality of aluminum ingot is improved.

Embodiment 21

The difference between this implementation case and the implementation case 18

1Ib, and the heat insulation cover 20b is buckled with the ingot mould 1lb. Then the

the cavity channel 24b in the upper cover. When the vacuum degree of the cavity

channel 13b in the box body and the cavity channel 24b in the upper cover is pumped to 100-1000 Pa, the valve is turned off, and the insulation cover 20b is removed after h, and the mold is removed and the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 90.7%, and the

quality of aluminum ingot is improved.

Embodiment 22

40mm.

The casting metal liquid is copper liquid, and the heat insulation method is as

follows: the copper liquid is injected into the first sealing space of the ingot mould 1Ib,

and the heat insulation cover 20b is buckled with the ingot mould 1lb. Then the vacuum

pump suction port is connected with the outer shell suction port 121b through the first

suction pipe 122b to vacuum the cavity channel 13b in the box body, and the second

suction pipe 212b is connected with the outer cover suction port 211b to vacuum the

cavity channel 24b in the upper cover. When the vacuum degree of the cavity channel

13b in the box body and the cavity channel 24b in the upper cover is pumped to 0.1-100

Pa, the valve is turned off, and the insulation cover 20b is removed after 20 h, and the

mold is removed and the ingot is suspended.

Compared with conventional casting, the grades of defects such as central

segregation and central porosity of the copper ingot in this implementation case were

all controlled below 1.5, and the proportion of grade < 1.0 reached 97.8%, and the

quality of the copper ingot was improved.

Embodiment 23

The difference between this implementation case and the implementation case 22

is that the copper liquid is injected into the first sealing space of ingot mould 1Ib, and

the insulation cover 20b is buckled with ingot mould 1lb. The first suction pipe 122b

is connected with the shell suction port 121b, and the second suction pipe 212b is connected with the outer cover suction port 21lb. The cooling water valve is opened to cool the water in the cavity channel 13b of the box body and the middle cavity 24b of the upper cover. The cooling water flow is 1 - 30 t/h. After 10 h, the insulation cover b is removed, the mould is demoulded and the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

and central porosity of the copper ingot in this implementation case are all controlled

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 92.5%, and the

quality of aluminum ingot is improved.

Embodiment 24

The difference between this implementation case and the implementation case 22

1ib, and the heat insulation cover 20b is buckled with the ingot mould 1lb. The

the second extraction tube 212b, and the compressed air flow is controlled at 50~100

L/min. After 10 h, the heat insulation cover 20b is removed, the mould is removed, and

the ingot is suspended.

Compared with the conventional casting, the defects such as central segregation

below 1.5 grade, and the proportion of evaluation grade < 1.0 grade is 93.4%, and the

quality of aluminum ingot is improved.

Embodiment 25

liquid copper is injected into the first sealing space of the ingot mold 1lb and the

insulation cover 20b is clasped to the implementation case and the implementation case

22the ingot mold, The difference between is that the copper liquid is injected into the

with the ingot mold 1lb.Then the vacuum pump suction port is connected with the outer

shell suction port 121b through the first suction pipe 122b to vacuum the cavity channel

13b in the box body, and the second suction pipe 212b is connected with the outer cover

suction port 211b to vacuum the cavity channel 24b in the upper cover. When the

vacuum degree of the cavity channel 13b in the box body and the cavity channel 24b in

the upper cover is pumped to 100-1000 Pa, the valve is turned off, and the insulation

cover 20b is removed after 20 h, and the mold is removed and the ingot is suspended.

Compared with conventional casting, the grades of defects such as central

all controlled below 1.5, and the proportion of grade < 1.0 reached 91.7%, and the

quality of the copper ingot was improved.

It can be seen that the metal liquid solidification device 100b can improve the

insulation performance of the first sealing space by setting the second sealing space

outside the first sealing space, which can reduce the temperature difference between the

inner and outer surface of the ingot mold 1Ib, and greatly reduce the thermal stress of

the ingot mold 1lb during the metal liquid cooling process, which is beneficial to

prolong the service life of the ingot mold 1lb. By adjusting /controlling the cooling

medium in the second sealing space, the cooling rate of the metal liquid in the first

sealing space is adjusted/controlled to make the metal liquid crystallize, so as to reduce

the central segregation and central porosity of the metal ingot and improve the quality

of the metal ingot. The cooling rate can also be adjusted by changing the cooling

medium to adapt to different solidification requirements of metal liquid, so that the heat

transfer uniformity of temperature field in the solidification process of metal liquid is

higher, which is conducive to the elimination of dendrite segregation of metal ingot.

The metal liquid solidification device 100b and the heat insulation method are suitable

for the preparation of all tonnage metal ingots, with a wide range of applications. They

can be applied to the preparation of carbon steel, alloy steel and nonferrous metals under

vacuum and non-vacuum conditions. The process is simple, reliable and safe, and the

investment and maintenance costs are low.

In the third implementation mode, please refer to Figs. 5-6, a metal material

insulation device 100c includes a box body 10c and an upper cover 20c sealed and closed on the box body 10c.The box body 10c includes the inner liner 11c for containing metal materials, an outer shell 12c set around the inner liner 11c , and a vacuum cavity c set between the inner liner 1Ic and the outer shell 12c.

The vacuum cavity 5c is assembled by splicing several small vacuum chambers

51c. A single small vacuum chamber 51c consists of a peripheral wall 511c, an upper

cover 513c and a lower cover 514c of the peripheral wall 511c connected with the upper

end face and the lower end surface, respectively, and a closed cavity 512c surrounded

by the upper cover 513c, the lower cover 514c and the peripheral wall 511c. The suction

hole 515c is machined on the wall 511c of a single small vacuum chamber 51c to

connect the vacuum tube to form a vacuum chamber. A number of small vacuum

chambers 51c were pasted, combined and fixed on the shell 12c, that is, between the

inner lining 1Ic and the shell 12c, a cavity channel in the box body formed by the

splicing of several sealed chambers 512c (not marked) was formed. In this setting, the

vacuum cavity 5c formed a thermal insulation layer around the lining 1Ic to achieve

insulation effect.

The structure of the upper cover 20c of the metal material insulation device 100c

and the sealing connection relationship between the upper cover 20c and the box body

c are basically the same as those in the first implementation method and will not

repeated here.

The following is a description of the use process of the metal material insulation

device 100c:

The vacuum cavity 5c was made according to the size of the shell 12c and the

inner lining 11c. The vacuum chamber 5c is divided into several small vacuum

chambers 51c. The suction hole 515c in the small vacuum chamber 51c is connected to

the vacuum pump pipeline to vacuum to 0.1 - 1000 Pa, and then the suction hole 515c

was sealed. The vacuum chamber 51c was transported to the production site and welded

on the shell 12c, and finally the vacuum cavity 5c was formed by splicing. In this way,

the vacuum degree of a single small vacuum chamber 51c can be set according to the use needs, and then the fabricated small vacuum chamber 51c can be transported to the production site for fixed installation on the shell 12c, which greatly reduces the installation strength of the vacuum insulation layer, and the operation is simple and convenient.

In this implementation, the thickness of the closed cavity 512c is 20mm, that is,

the thickness of the cavity channel in the box body is 20mm. This thickness can ensure

that the vacuum cavity 5c has sufficient strength and thermal insulation performance.

Of course, technical personnel in this field should understand that this thickness can

also be set to other values as needed, without specific restrictions.

Further, technicians in this field should understand that thermal insulation

materials can be filled in the cavity of the box body to further improve the insulation

effect.

It can be seen that the metal material insulation device100c in this implementation

mode divides the vacuum cavity 5c into several small vacuum chambers 51c. The small

vacuum chamber is made and vacuumized, and then the small vacuum chamber 51c is

transported to the production site and fixed on the shell 12c of the device, which greatly

reduces the installation labor intensity of the vacuum insulation layer and increases the

use range. The heat insulation method of the invention : The cooling rate of metal

materials can be adjusted by controlling / adjusting the vacuum degree in the second

sealing space, which can adapt to the slow cooling requirements of metal materials in

different environments. There is no need for heat insulation pits, so that the heat transfer

uniformity of temperature field in the slow cooling process of metal materials is higher,

which is conducive to avoiding the risk of segregation, cracking and abnormal

deformation of metal materials during high temperature quenching, and improving the

mechanical properties of metal materials. The thermal insulation method of the

invention can also control / adjust the cooling medium in the second sealing space to

adjust the cooling rate of the metal liquid in the first sealing space to make the metal

liquid crystallize, so as to reduce the central segregation and central porosity of the

metal ingot and improve the quality of the metal ingot.

The above implementation cases are only used to explain the technical scheme of

the invention, not the limitation. Although the invention is described in detail with

reference to the better implementation cases, the ordinary technicians in this field

should understand that the technical scheme of the invention can be modified or

replaced equivalently, without breaking away from the spirit and scope of the technical

scheme of the invention.

Claims

1. A metal material insulation device, including a box body and upper cover. It is

characterized in that: the box body includes an inner liner for containing metal

materials, an outer shell sleeved on the outer periphery of the inner liner, and a

vacuum cavity provided between the inner liner and the outer shell. The upper

cover comprises an outer cover, an inner cover connected with the outer cover

and an upper cover cavity channel formed between the outer cover and the inner

cover. The upper cover is sealed and connected with the box body to form the

first sealing space for the metal material and the second sealing space arranged

around the first sealing space.

2. The metal material insulation device specified in claim 1 is characterized by the

vacuum cavity having a cavity channel formed in the box body between the

lining and the shell. The shell has a shell suction port and thefirst suction pipe

set in the shell suction port. One end of the first suction pipe is connected with

the cavity channel in the box body, and the other end is closed with a valve. The

outer cover is provided with an outer cover suction port and a second suction

pipe arranged in the outer cover suction port. One end of the second suction pipe

is connected with the cavity channel in the upper cover, and the other end is

closed with a valve.

3. According to the metal material heat insulation device described in claim 2, its

characteristics are as follows: the bottom surface of the inner cover is sealed and

connected with the upper end surface of the inner lining to form the first sealing

space. The bottom surface of the outer cover is sealed and connected with the

upper end surface of the shell to form the second sealing space.

4. The metal material insulation device specified in claim 3 has the following

characteristics: the outer edge of the inner cover is provided with a first step

surface, and the corresponding position of the upper surface of the lining is

provided with a second step surface matching the first step surface. The outer edge of the cover is provided with a third step surface, and the corresponding position of the upper surface of the shell is provided with a fourth step surface matching the third step surface.

5. According to the metal material insulation device mentioned in claim 1, its

characteristics are as follows: the outer cover is fixedly connected with the

bottom of the inner cover, and the outer shell is fixedly connected with the top

of the inner lining. The bottom of the upper cover is provided with a positioning

block protruding in the direction of the box body, and the corresponding position

of the upper end face of the box body is provided with a positioning groove

containing the positioning block.

6. According to the metal material heat insulation device mentioned in claim 1, its

characteristics are as follows: at least one supporting foot is arranged on the inner

lining, which extends from the bottom wall of the inner lining to the shell and

contacts with the shell.

7. The metal material insulation device specified in claim 6 is characterized by at

least one supporting foot set at the center of the lining or uniformly distributed

at the edge of the lining.

8. According to the metal material insulation device mentioned in claim 1, its

characteristics are as follows: the vacuum chamber is composed of several small

vacuum chambers. The small vacuum cavity is fitted and fixed on the shell. The

small vacuum cavity comprises a perimeter wall, an upper cover and a lower

cover connecting the perimeter wall at the upper end face and the lower end face

respectively, and a sealed cavity surrounded by the upper cover and the lower

cover and the perimeter wall around.

9. According to the metal material insulation device mentioned in claim 8, its

characteristics are as follows: there is a pumping hole on the circumference wall

of a single small vacuum cavity.

10. The metal material insulation device specified in claim 1 is characterized by a flat plate-like arrangement of the outer cover and the inner cover, or the outer cover and the inner cover are arc-shaped.

11. A heat insulation method is suitable for the metal material heat insulation device

mentioned in claim 1. Its characteristics are as follows: the heat insulation

method includes the following steps: the metal material that needs slow cooling

after heat treatment is put into the metal material heat insulation device, and close

the upper cover to the box body. The cooling rate of the metal material is adjusted

by controlling the vacuum degree in the cavity channel and / or the cavity channel

in the upper cover.

12. According to the insulation method described in claim 11, its characteristics are

as follows: the pressure value range of the cavity duct in the box body and / or

the cavity duct in the upper cover is 1 x 10-' ~1 x 10' Pa.

13. A heat insulation method applicable to the metal material heat insulation device

specified in claim 1 is characterized by the following steps: the cooling rate of

the metal material is adjusted by controlling the cooling medium in the cavity of

the box body and / or in the cavity of the upper cover.

14. The insulation method described in claim 13 is characterized by that the metal

material insulation device is a metal liquid solidification device for cooling and

solidification of metal liquid.

15. According to the heat insulation method described in claim 13, its characteristic

is that the cooling medium includes but is not limited to water or compressed gas.

16. According to the heat insulation method described in claim 15, its characteristics

are: the cooling medium is water, and the flow rate is 1 ~ 30 t / h.

17. According to the insulation method described in claim 15, its characteristics are:

the cooling medium is compressed gas, and the flow rate of the compressed gas

is 50 - 1000 L /min.

18. According to the heat insulation method described in claim 14, its characteristics are that the metal liquid is one or more of the aluminum liquid, copper liquid or steel liquid.