CN212634277U

CN212634277U - Negative pressure low pressure casting flexible manufacturing device based on 3D prints, production line

Info

Publication number: CN212634277U
Application number: CN202021465383.7U
Authority: CN
Inventors: 王业双
Original assignee: Nasiway Technology Suzhou Co Ltd
Current assignee: Nasiway Technology Suzhou Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-03-02
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a flexible manufacturing installation of negative pressure low pressure casting and production line based on 3D prints to casting production small batch or sample production process flow is complicated among the solution prior art, with high costs and not environmental protection, the problem of inefficiency. This flexible manufacturing installation of negative pressure low pressure casting based on 3D prints includes: a holding furnace for holding the melt, wherein the holding furnace can be controllably applied with positive pressure; a lift pipe having a lower end capable of being immersed in the melt in the holding furnace; the standard template is positioned on the holding furnace and is provided with a through hole for the lift pipe to pass through; and the sealing cover is matched with the standard template to form a casting cavity, negative pressure can be controllably applied in the casting cavity, and the lift pipe extends into the casting cavity through the through hole and can be matched with the 3D printing sand mold arranged on the standard template.

Description

Negative pressure low pressure casting flexible manufacturing device based on 3D prints, production line

Technical Field

The utility model belongs to the technical field of the casting, concretely relates to negative pressure low pressure casting flexible manufacturing installation, production line based on 3D prints.

Background

Under the condition of modern casting industry, a set of mould is required to be processed firstly when a part is poured or a set of sand core is manufactured. But 4-6 months are needed for processing a set of die, 4-6 months are needed from the transportation to the making of the first blank, and 1-2 months are needed from the transportation to the making of the first blank, so that the whole period is long and the cost is high.

In addition, the traditional core making process has low precision and cannot meet the casting quality requirements of complex structure and higher precision. However, with the rapid development of the 3D printing technology, especially the deep research on the 3D printing sand mold/core technology, the 3D printing technology has been widely applied in the design and development process of automobile castings, and has the advantages of high efficiency, flexibility and low cost, so that the competitiveness of enterprises is greatly improved, and the requirements of different consumer groups are met.

The current 3D printing sand mold is generally poured manually by gravity, the labor condition is poor, and a large amount of harmful substances such as free phenol, free aldehyde, dust and the like are generated in the casting production process and are harmful to human bodies and the working environment.

In view of the above, it is an urgent need to provide a safe, environment-friendly and efficient casting method.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a negative pressure low pressure casting flexible manufacturing device based on 3D prints, production line to solve among the prior art problem that the casting method is not environmental protection, inefficiency.

In order to achieve the above object, an embodiment of the present application provides the following technical solutions:

a negative pressure low pressure casting flexible manufacturing device based on 3D printing includes:

a holding furnace for holding the melt, wherein the inside of the holding furnace can be controlled to apply positive pressure;

a lift pipe having a lower end that can be immersed in the melt in the holding furnace;

the standard template is positioned on the holding furnace and is provided with a through hole through which the liquid lifting pipe passes;

and the sealing cover is matched with the standard template to form a casting cavity, negative pressure can be controllably applied in the casting cavity, and the lift pipe extends into the casting cavity through the through hole and can be matched with the 3D printing sand mold arranged on the standard template.

In one embodiment, the holding furnace is provided with a positioning pin, and the standard template is provided with a positioning hole matched with the positioning pin.

In one embodiment, the sealing cover is provided with an exhaust valve, and the negative pressure low pressure casting flexible manufacturing device comprises an vacuumizing system which can be matched with the exhaust valve.

In one embodiment, the holding furnace is provided with a pressurizing opening, and the negative pressure low pressure casting flexible manufacturing device comprises a pneumatic mold filling system which can be matched with the pressurizing opening.

In one embodiment, the vacuum degree in the casting cavity can be controlled and maintained between-0.005 MPa and-0.06 MPa.

One embodiment of the present application provides a negative pressure low pressure casting flexible manufacturing line based on 3D printing, comprising a mold preparation area, a casting platform, a cooling area, and a sand falling area, wherein the mold preparation area can circularly circulate standard templates,

the casting mold preparation area is used for assembling a 3D printing sand mold on a standard template;

the casting platform comprises the negative pressure low pressure casting flexible manufacturing device based on 3D printing, and the standard template and the 3D printing sand mold assembled in the casting mold preparation area can successively replace the standard template and the 3D printing sand mold on the negative pressure low pressure casting flexible manufacturing device at the casting platform;

the cooling area is used for cooling a casting in the 3D printing sand mold of the lower mold of the casting platform by relying on a standard template;

and the shakeout area is used for separating the 3D printing sand mold and the casting on the standard template and recovering the no-load state of the standard template to send the standard template into the casting mold preparation area.

An embodiment of the application provides a method for manufacturing flexibility by performing negative pressure low pressure casting based on 3D printing according to the above device, the method including:

assembling the 3D printing sand mold on the standard template, and enabling the through hole in the standard template to be communicated with a cavity in the 3D printing sand mold;

positioning the standard template assembled with the 3D printing sand mold on the holding furnace, and covering the sealing cover;

applying positive pressure to the holding furnace and negative pressure to the casting cavity so that the molten liquid in the holding furnace is injected into the cavity of the 3D printing sand mold through the lift pipe;

and maintaining the casting cavity at a set negative pressure until the casting in the 3D printing sand mold cavity is cooled and formed.

In one embodiment, the method further comprises:

and moving the 3D printing sand mold out of the casting cavity by depending on the standard template, and recovering the standard template after taking out the casting.

In one embodiment, the method further comprises:

and printing the part with the precision requirement exceeding the set standard in the 3D printing sand mold at high precision, and printing the part with the precision requirement being lower than the set standard in the 3D printing sand mold at high speed.

In one embodiment, applying positive pressure to the holding furnace to inject the melt in the holding furnace into a cavity of a 3D printing sand mold through a lift tube specifically includes:

applying a first section of positive pressure to the holding furnace until the molten liquid rises to a bottom die of the 3D printing sand mold;

applying a second-stage positive pressure to the holding furnace until the molten liquid is filled in the cavity of the 3D printing sand mold;

wherein the second positive segment pressure is greater than the first positive segment pressure.

In one embodiment, the molten liquid in the holding furnace is controlled to be injected into a cavity of the 3D printing sand mold at a liquid raising speed of 0.3-1.3 m/s.

The application provides a according to the flexible manufacturing approach of negative pressure low pressure casting that foretell assembly line carries out based on 3D prints, its characterized in that includes:

assembling a 3D printing sand mold in the casting mold preparation area by relying on a standard template;

the standard template assembled with the 3D printing sand mold is molded to a negative pressure low pressure casting flexible manufacturing device at the casting platform, and pouring is carried out;

transferring the poured 3D printing sand mold to the cooling area for cooling by depending on a standard template;

and transferring the cooled 3D printing sand mold to the sand falling area by depending on a standard template so as to separate the 3D printing sand mold and a casting therein, and transferring the unloaded standard template to the casting preparation area.

In the embodiment of the application, a 3D printing casting mold technology and a low-pressure casting process are combined, the sand mold can be conveniently prepared, excessive pressure cannot be generated on the casting mold in the low-pressure casting mode, and the low-pressure casting method can be well combined with the sand mold casting process; the matched casting cavity negative pressure technology can improve the casting filling performance, reduce the generation of casting defects such as pinholes, surface air holes and the like, and improve the quality of casting products; the negative pressure applied to the casting cavity can collect and intensively treat harmful substances such as free phenol, free aldehyde, dust and the like generated in the casting production process, so that the working environment is improved; meanwhile, an offline assembly process of a standard template and a sand mold is adopted, the production efficiency of equipment can be greatly improved, the production rhythm is not influenced by product model changing, and castings of different types can be operated in a collinear mode, so that customized and flexible production of parts is realized.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a negative pressure low pressure casting flexible manufacturing device based on 3D printing according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a standard template and a 3D printing sand mold assembled in-line in one embodiment of the present application;

FIG. 3 is a schematic structural diagram of a negative pressure low pressure casting flexible manufacturing line based on 3D printing according to an embodiment of the present application;

FIG. 4 is a flow chart of a negative pressure low pressure casting flexible manufacturing method based on 3D printing according to an embodiment of the present application;

FIG. 5 is a pressure control diagram within a holding furnace during a casting process according to an embodiment of the present application;

fig. 6 is a flowchart of a negative pressure low pressure casting flexible manufacturing method based on 3D printing according to an embodiment of the present application.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. However, the present invention is not limited to the embodiments, and the structural, method, or functional changes made by those skilled in the art according to the embodiments are all included in the scope of the present invention.

Referring to fig. 1 and 2, an embodiment of a negative pressure low pressure casting flexible manufacturing apparatus 100 based on 3D printing according to the present application will be described. In the present embodiment, the negative pressure low pressure casting flexible manufacturing apparatus 100 includes a holding furnace 10, a lift pipe 20, a master form 30, and a sealing cover 40.

The holding furnace 10 is used for holding a melt, in particular a high-temperature melt of a metal or a metal alloy. The melt has a fluid form that is easily flowable in a state of being heated at a high temperature, and is cooled and solidified in a subsequent casting process. In the embodiment of the present application, the negative pressure low pressure casting flexible manufacturing apparatus 100 is suitable for preparing castings made of alloy materials such as aluminum alloy, magnesium alloy, cast iron, and cast steel.

The holding furnace 10 may have a heat insulating property and, for example, may be provided with a heat insulating material to maintain the molten state of the melt therein. In a specific arrangement, the holding furnace 10 may be used directly for holding the melt, or alternatively, a crucible 13 may be provided in the holding furnace 10, and the melt may be held indirectly by the crucible 13. The holding furnace 10 may be provided with a pouring port 12, and the melt may be poured into the holding furnace 10 or a crucible 13 of the holding furnace 10 through the pouring port 12. Of course, in some embodiments, the pouring outlet 12 may not be provided, and a heating device may be provided to the holding furnace 10 to melt the material to be cast in the holding furnace 10.

The lower end of the lift pipe 20 may be immersed in the melt in the holding furnace 10, and the inside of the holding furnace 10 may be controllably applied with positive pressure. Specifically, the holding furnace 10 may be provided with a pressure port 11, and the negative pressure low pressure casting flexible manufacturing apparatus 100 includes a gas pressure filling system (not shown) that is engageable with the pressure port 11 and by which positive pressure is applied to the inside of the holding furnace 10 so that the melt is drivingly lifted along the lift pipe 20.

The standard template 30 is positioned on the holding furnace 10, and specifically, the standard template 30 and the holding furnace 10 can be quickly positioned by a positioning mechanism which is engaged with each other. In one embodiment, the holding furnace 10 is provided with a positioning pin 70, and the standard template 30 is provided with a positioning hole 31 capable of cooperating with the positioning pin 70, and the cooperating pin hole structure can conveniently determine the relative position of the standard template 30 and the holding furnace 10, so as to improve the efficiency of the casting process.

The sealing cap 40 cooperates with the standard die plate 30 to form a casting cavity 50, and the standard die plate 30 is provided with a through hole (not shown) through which the lift tube 20 passes, and the lift tube 20 extends into the casting cavity 50 through the through hole. The 3D printing sand mold 60 can be configured in the casting cavity 50 by relying on the standard template 30, the lift tube 20 is further matched with the 3D printing sand mold 60, and the molten liquid is lifted and injected into the mold cavity 61 of the 3D printing sand mold 60.

The casting cavity 50 can be controlled to apply negative pressure, and for example, the exhaust valve 41 is matched to collect and intensively treat harmful substances, such as free phenol, free aldehyde, dust and the like, generated in the casting production process in the casting cavity 50, so as to improve the working environment. Specifically, the vacuum low-pressure casting flexible manufacturing apparatus 100 comprises a vacuum pumping system (not shown) capable of cooperating with the exhaust valve 41, wherein the vacuum pumping system can perform vacuum pumping operation on the casting cavity 50 through the exhaust valve 41, and the vacuum degree in the casting cavity 50 can be controlled and maintained between-0.005 Mpa and-0.06 Mpa, and the specific vacuum degree control can be set according to the size and quality requirements of the casting to be cast.

In the embodiment, the 3D printing casting mold technology and the low-pressure casting process are combined, the sand mold 60 can be conveniently prepared, excessive pressure cannot be generated on the casting mold in the low-pressure casting mode, and the low-pressure casting method can be well combined with the sand casting process; the matched casting cavity negative pressure technology can improve the casting filling performance, reduce the generation of casting defects such as pinholes, surface air holes and the like, and improve the quality of casting products.

Referring to fig. 3, a specific embodiment of a negative pressure low pressure casting flexible manufacturing line 200 based on 3D printing according to the present application is described. In this embodiment, the negative pressure low pressure casting flexible manufacturing line 200 includes a mold preparation area 201, a casting platform 202, a cooling area 203, and a knockout area 204.

The mold preparation area 201, the casting platform 202, the cooling area 203, and the shakeout area 204 may be used to circulate a standard pattern plate 30, the standard pattern plate 30 being configured to mate with the mold preparation area 201, the casting platform 202, the cooling area 203, and the shakeout area 204, respectively.

The mold preparation area 201 is used to assemble the 3D printed sand mold 60 on a standard mold plate where sand molds corresponding to different types of castings can be assembled as desired.

The casting platform 202 includes the above-mentioned negative pressure low pressure casting flexible manufacturing apparatus 100 based on 3D printing, and the standard template 30 and the 3D printing sand mold 60 assembled in the mold preparation area 201 may successively replace the standard template 30 and the 3D printing sand mold 60 on the negative pressure low pressure casting flexible manufacturing apparatus 100 at the casting platform 202.

In the specific operation, after the negative pressure low pressure flexible manufacturing device 100 on the casting platform 202 finishes pouring the sand mold 60, the sealing cover 40 is opened, the poured 3D printing sand mold 60 is subjected to lower mold by the automatic lower mold device, meanwhile, the assembled standard template 30 and the 3D printing sand mold 60 upper mold are assembled in the mold preparation area 201, and the sealing cover 40 descends to be folded and sealed with the replaced standard template 30; and the 3D printed sand mold 60 after the lower mold enters the cooling zone 203 along the line.

The cooling zone 203 is used to cool the castings in the 3D printed sand molds 60 that are molded from the casting platform 202 against the standard template 30.

The knockout zone 204 is used to separate the 3D printed sand mold 60 from the casting on the standard pattern plate 30 and restore the empty state of the standard pattern plate 30 to be fed into the mold preparation zone 201 again. In one embodiment, the knockout zone 204 is provided with a shaker table (not shown) that is adapted to shake apart the sand mold 60 and mechanically separate the formed casting from the master pattern plate 30, and the sand is separated from the master pattern plate 30 to return to the empty state of the master pattern plate 30.

In the above work flow of the negative pressure low pressure casting flexible manufacturing line 200, the standard template 30 is displaced on the casting platform 202 in the vertical and horizontal directions, so as to realize rapid mold change and ensure the high efficiency of the production line 200. In addition, in order to reduce the smoke emission in the production process, a dust hood 205 can be additionally arranged in the cooling area 203 and the sand falling area 204 of the production line so as to meet the requirement of environmental protection.

In the traditional process, one or more sets of special dies are needed for one casting product, and when the product type needs to be replaced in continuous production, the corresponding dies need to be replaced and production process parameters need to be adjusted. The application relies on the standard template 30 which can be rapidly circulated and replaced, different casting products have corresponding parameters and 3D designs, but different types of casting products can be continuously produced in a collinear manner on the production line 200 without difference, and different process parameters are respectively adopted on the casting platform 202. From the production rhythm, the casting products of the same type are completely and equivalently produced continuously, and the limit of single piece (sample) production and mass production is flattened.

With reference to fig. 4, an embodiment of a method for manufacturing a flexible substrate by negative pressure low pressure casting based on 3D printing using the above apparatus will be described. In this embodiment, the method comprises:

s11, assembling the 3D printing sand mold on the standard template, and enabling the through holes in the standard template to be communicated with the cavities in the 3D printing sand mold.

The 3D printing sand mold 60 can be designed and manufactured by performing casting process analysis according to part drawings or 3D modeling, and increasing or adjusting machining allowance according to the characteristics of a negative-pressure low-pressure casting process to determine the placement layout of the mold; and designing a runner system according to the process characteristics, performing mould Flow analysis by adopting mould Flow analysis software (such as Magma-Soft, Flow-3D and the like), predicting the product defects, and if necessary, performing the optimal design of the runner, simulating the pressure applied to the molten liquid, the solution pouring Flow rate control, the casting heat preservation time and the like in the casting process to ensure that the product quality requirement of the casting is met. And the casting process related parameters determined in the simulation analysis process can be directly transmitted to the controller of the negative pressure low pressure casting flexible manufacturing device, so that when different types of 3D printing sand molds are poured, the controller of the negative pressure low pressure casting flexible manufacturing device can call the related casting process parameters corresponding to the 3D printing sand molds of the types, the parameters are used for controlling the production process of a casting field, and the intellectualization of casting production is realized.

In the design process, vent holes 62 are formed in the top of a cavity 61 of the 3D printing sand mold 60 and key parts of a casting, so that smooth exhaust in the molten liquid injection process is ensured, and design data of the 3D printing sand mold 60 are transmitted to 3D printing equipment for printing.

The 3D printing sand mold can be formed by printing quartz sand containing a compound binder, the 3D printing technology is adopted to print the sand mold, the product structure (such as the draft angle of 0, no parting surface and the like) is not needed to be considered, and any structure can be directly printed and molded.

In this embodiment, the high-precision printing is performed on the part of the 3D printing sand mold where the precision requirement exceeds the set standard, and the high-speed printing is performed on the part of the 3D printing sand mold where the precision requirement is lower than the set standard. The accuracy requirement may be determined according to the roughness requirements of different parts of the sand mold, so that some parts with fine structures may be determined as those with accuracy requirements exceeding a set standard, and the remaining parts may be determined as those with accuracy requirements lower than the set standard. In the present embodiment, a portion where these accuracy requirements exceed the set criteria is referred to as a high-accuracy region, and a portion where the accuracy requirements fall below the set criteria is referred to as a low-accuracy region. When sand mold 3D data is prepared, the high-precision region and the low-precision region may be separated and input to different 3D sand mold printers. Thus, the requirements of high precision and printing efficiency can be met simultaneously. For the part with higher precision requirement in the 3D printing sand mold 60, a conventional 3DP sand mold printer can be adopted, the printing speed is 10 liters/hour, the precision of the key part is ensured, and for the part with lower precision requirement, the printing speed is improved to 70-100 liters/hour, so as to meet the requirement of a low-precision area on the printing efficiency.

The printed 3D printing sand mold 60 can be assembled with the standard template 30 in-line, ready for the upper mold. This has the advantage of allowing a higher utilization of the negative pressure low pressure casting flexible manufacturing apparatus, thereby improving casting efficiency.

And S12, positioning the standard template assembled with the 3D printing sand mold on a holding furnace, and adding the cover sealing cover.

Specifically, the standard template and the holding furnace are accurately positioned through the matching of the positioning pins and the positioning holes, and the capped sealing cover and the standard template are further combined into a casting cavity.

And S13, applying positive pressure to the holding furnace and applying negative pressure to the casting cavity, so that the molten liquid in the holding furnace is injected into the cavity of the 3D printing sand mold through the lift pipe.

Specifically, a first section of positive pressure is applied to the holding furnace until the molten liquid rises to a bottom die of the 3D printing sand mold, and then a second section of positive pressure is applied to the holding furnace until the molten liquid is filled in a cavity of the 3D printing sand mold; wherein the applied second positive pressure is greater than the first positive pressure; the vacuum-pumping system carries out vacuum-pumping operation on the casting cavity, and the vacuum degree in the casting cavity can be kept between-0.005 and-0.06 MPa in a controlled manner. And in the process of applying the second-stage positive pressure to the holding furnace, controlling the molten liquid in the holding furnace to be injected into the cavity of the 3D printing sand mold at the liquid ascending speed of 0.3-1.3 m/s (namely, in the mold filling stage).

And S14, maintaining the casting cavity at a set negative pressure until the casting in the 3D printing sand mold cavity is cooled and formed.

Harmful gas and dust in the casting process can be collected and intensively treated by maintaining the negative pressure in the casting cavity through vacuumizing operation. In the process, the furnace can be kept in coordination with the continuous application of a certain positive pressure. Referring to fig. 5, in an exemplary embodiment, during the gradual forming process, the pressure in the holding furnace is divided into several stages, namely, a incrustation pressurizing stage, an incrustation pressure maintaining stage, a crystallization pressurizing stage, a crystallization pressure maintaining stage, and a pressure releasing stage, and during the incrustation pressurizing stage, the gradually rising pressure is provided in the holding furnace until the incrustation pressure maintaining value is reached, and the incrustation pressure maintaining stage is entered; and the pressure setting time is maintained in the crusting pressure maintaining stage, the crystallization pressure increasing stage is started, the pressure which continues to rise is provided for the holding furnace in the crystallization pressure increasing stage until the crystallization pressure maintaining value, the crystallization pressure maintaining stage is started, the pressure setting time is maintained in the crystallization pressure maintaining stage until the casting is formed, and then the pressure is released for the holding furnace.

And after the casting is cooled and formed, opening the sealing cover, moving the 3D printing sand mold out of the casting cavity by depending on a standard template, and carrying out the next casting cycle. And (3) placing the standard template loaded with the 3D printing sand mold on a cooling line for cooling, then vibrating the sand, removing a dead head and cleaning to finally obtain a qualified blank casting, and recovering the standard template after the casting is taken out for casting in the next round. Due to the adoption of the offline assembly process of the standard template and the sand mold, the production efficiency of equipment can be greatly improved, and the production rhythm is not influenced by product model change, so that the customized and flexible production of parts is realized.

With reference to fig. 6, the present application also provides a method for manufacturing flexibility by negative pressure low pressure casting based on 3D printing using the production line described above, the method comprising:

and S21, assembling the 3D printing sand mold by relying on a standard template in a mold preparation area.

And S22, carrying out mould loading on the standard template assembled with the 3D printing sand mould to the negative pressure low pressure casting flexible manufacturing device at the casting platform, and pouring.

And S23, transferring the poured 3D printing sand mold to the cooling area for cooling by depending on a standard template.

And S24, transferring the cooled 3D printing sand mold to the sand falling area by depending on the standard template so as to separate the 3D printing sand mold and the casting in the 3D printing sand mold, and transferring the unloaded standard template to the mold preparation area.

In the above embodiments/examples, the positive pressure in the furnace and the negative pressure in the casting cavity, the flow rate of the molten metal pouring, the casting heat preservation time, the circulation of the standard template on the production line, and the like can be controlled manually or by a controller. The Controller may be an integrated circuit including a Microcontroller (MCU), and as is well known to those skilled in the art, the microcontroller may include a Central Processing Unit (CPU), a Read-Only Memory (ROM), a Random Access Memory (RAM), a timing module, a digital-to-analog conversion (a/D Converter), and several input/output ports. Of course, the controller may also be an Application Specific Integrated Circuit (ASIC) or a Field Programmable Gate Array (FPGA).

Also, it should be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish these descriptive objects from one another. For example, the first mode may be referred to as the second mode, and similarly the second mode may also be referred to as the first mode, without departing from the scope of the present application.

Also, the same reference numbers or symbols may be used in different embodiments, but this does not represent a structural or functional relationship, but merely for convenience of description.

The use of terms herein such as "upper," "above," "lower," "below," and the like in describing relative spatial positions is for the purpose of facilitating description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

When an element or layer is referred to as being "on," or "connected" to another element or layer, it can be directly on, connected to, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A negative pressure low pressure casting flexible manufacturing device based on 3D printing is characterized by comprising:

2. The negative pressure low pressure casting flexible manufacturing device based on 3D printing of claim 1, wherein the holding furnace is provided with a positioning pin, and the standard template is provided with a positioning hole capable of being matched with the positioning pin.

3. The negative pressure low pressure casting flexible manufacturing device based on 3D printing of claim 1, wherein an exhaust valve is arranged on the sealing cover, and the negative pressure low pressure casting flexible manufacturing device comprises an evacuation system which can be matched with the exhaust valve.

4. The negative pressure low pressure casting flexible manufacturing device based on 3D printing of claim 1, wherein a pressurizing port is provided on the holding furnace, and the negative pressure low pressure casting flexible manufacturing device comprises a pneumatic mold filling system capable of being matched with the pressurizing port.

5. The negative pressure low pressure casting flexible manufacturing device based on 3D printing as claimed in claim 1, wherein the vacuum degree in the casting cavity can be controlled to be maintained between-0.005 Mpa and-0.06 Mpa.

6. A negative pressure low pressure casting flexible manufacturing production line based on 3D printing is characterized by comprising a casting mold preparation area, a casting platform, a cooling area and a sand falling area, wherein the casting mold preparation area, the casting platform, the cooling area and the sand falling area can circularly circulate standard templates,

the casting platform comprises the negative pressure low pressure casting flexible manufacturing device based on 3D printing according to any one of claims 1 to 5, the standard template and the 3D printing sand mold assembled in the mold preparation area can successively replace the standard template and the 3D printing sand mold on the negative pressure low pressure casting flexible manufacturing device at the casting platform;