CN209393944U - Device for sand coated iron mould type core - Google Patents

Abstract

A kind of device for sand coated iron mould type core, comprising: the outer surface of metal mold, the metal mold has shape corresponding with shape of product to be cast；And it is covered on the outer surface of the metal mold and covers sand, wherein, the sand that covers is formed on the outer surface of the metal mold by 3D printing equipment, several micro- exhaust passages are formed in sand in described cover, micro- exhaust passage is interconnected and is connected in casting with the gap at sandbox die joint, micro- exhaust passage is formed during carrying out 3D printing using 3D printing equipment, several micro- exhaust passages are formed in the entire extension size of sand in described cover so that the gas that generates of casting pouring during is discharged to outside sandbox along the exhaust passage on the whole.By covering the structure of micro- exhaust passage in sand, so that the gas generated in casting process has obtained effective discharge.

Description

Device for sand coated iron mould type core

Technical field

This application involves the manufactures of the device for sand coated iron mould type core in casting field more particularly to casting technique, by iron 3D printing goes out covering sand and being formed with micro- exhaust passage for needs on mould.

Background technique

Casting industry is manufacturing basic industry, indispensable status is in the national economic development, in recent years Casting had obtained quick development already, and especially device for sand coated iron mould manufacturing technology is widely used, but conventional iron covers mould In sand technique, the manufacturing equipment for covering sand and sand core is complicated, and energy consumption is high, and made sand core poor air permeability causes cast article Some obstinate defects such as more stomatas, and can only the relatively simple product of making space structure.For this purpose, 3D printing technique is led in casting Domain has obtained a degree of application and development.

CN201711188955 discloses a kind of high temperature resistant 3D printing precoated sand forming and fixing agent and its preparation process, wherein It is referred to the component proportion of forming and fixing agent, i.e., in parts by weight mainly includes phenol-formaldehyde resin modified, polyvinyl butyral etc., To improve the adhesive strength and ageing-resistant performance of precoated sand, extend the service life of precoated sand.

CN108296420A discloses a kind of laser 3D printing precoated sand and preparation method thereof, also relates to by weight Raw material composition to improve integral strength, heat-resisting quantity, fire resisting persistence and the self structure stability of precoated sand.

CN108296442A discloses a kind of 3D printing precoated sand moulding process, discloses 3D printing overlay film in embodiment Several steps of sand moulding process: roughing sand drying, re-dry, in sand mixer prepares mixed sand, mixed sand is injected mould pickling Tool is passed through 100 DEG C of steam into mold to obtain 3D printing precoated sand semi-finished product, dry solidification molding to obtain molding 3D printing Precoated sand also discloses the component by weight for covering sand.

CN108672660A discloses a kind of 3D printing rapidform machine based on precoated sand material, is needing to beat using 3D When printing apparatus makes precoated sand coremaking, raw materials for production are added, equipment are accessed into external circuitry, staff passes through control panel control Electric motor operation processed, mobile spray gun lifting, raw material reach the limit plate top plate above stamp pad by spray gun, and control panel passes through The production work of precoated sand coremaking is completed in the cooperation for controlling booster pump, motor, the first cylinder and the second cylinder.

CN207205200U discloses a kind of precoated sand coremaking 3D printing equipment, is imported by central control unit wait beat Sand core data are printed, according to data, corresponding control electric signal adjusting print job platform position is generated and successively carries out each layer printing.

CN104923712A discloses a kind of 3D printing precoated sand and preparation method, is related to a kind of in casting field Precoated sand, the composition of precoated sand is also disclosed, wherein what is be added into sand mixer is melamine resin, cashew nut shell liquid Precoated sand is made by it in modified phenolic resin and binder.

Obviously in these traditional 3D printing device for sand coated iron mould manufacturing technologies, phenolic sand molding is mostly used greatly, sand dosage is big, makes Type time long low efficiency, intensity is low, moreover, using thermosetting organic resin as the disadvantage of binder be exactly exhaust gas discharge Problem, for organic resin multi-source in petroleum product or agricultural chemicals, price is high, and when moulding, coremaking, VOC value is high, endangers operator Health in casting process, generates a large amount of pernicious gases, pollutes environment.Therefore, it is necessary in casting process by these pernicious gases Discharge in time.

For this reason, it may be necessary to provide one kind compared with traditional swage covers sand core and traditional 3D printing Resin-bonded sand mold and core, has and change Into degassing function 3D printing overlay film sand core, with performance advantage outstanding, economic advantages and environment-friendly advantage.

Utility model content

The application aims to solve the problem that the following problems in existing foundry engieering: sand core manufacturing equipment is complicated, and energy consumption is high, sand core at This height, it is airtight, the problem of Yi Faqi；In device for sand coated iron mould technique, overlay film mo(u)lding equipment is complicated, and energy consumption is high, at high cost, impermeable The problem of gas, Yi Faqi；The 3D printing phenolic sand molding time is long, at high cost, low efficiency, intensity are small, exhaust gas discharges environmental issue.

For this purpose, the application provides a kind of device for sand coated iron mould type core, comprising: metal mold, the outer surface of the metal mold have with The corresponding shape of shape of product to be cast；And be covered on the outer surface of the metal mold and cover sand, In, the sand that covers is formed on the outer surface of the metal mold by 3D printing equipment, is formed in described cover in sand Several micro- exhaust passages, micro- exhaust passage are interconnected and are connected in casting with the gap at sandbox die joint, institute It states micro- exhaust passage to be formed during carrying out 3D printing using 3D printing equipment, several micro- exhaust passages exist on the whole It is formed in the entire extension size for covering sand so that the gas generated during casting pouring is arranged along the exhaust passage It is arrived outside sandbox out.

Optionally, the shape, size of several micro- exhaust passages and the distribution in sand is being covered by beating for 3D The CAD modeling process of printing apparatus determines.

Optionally, described to cover that sand is formed by the inorganic material with certain particle size or the inorganic material is formed Porous structure, it is logical that the aperture in gap or the porous structure between the particle of the inorganic material collectively forms the exhaust Road.

Optionally, the sand material that covers is made of silica sand and inorganic binder or a small amount of organic binder.

Optionally, the inorganic material includes silicate.

Optionally, the metal mold is made of the metal such as cast iron of high-intensitive and resistance to casting high temperature.

Optionally, the metal mold is formed into solid or hollow structure.

Optionally, the section of micro- exhaust passage is circle, ellipse, rectangle, polygon or irregular shape.

Optionally, the thickness for covering sand is about 7mm.

The device for sand coated iron mould type core of the application, by the way that 3D printing forms on swage with essentially inorganic material, so that covering mould There is micropore degassing function, the exhaust passage is formed by connecting by the microchannel to interconnect, the exhaust passage in sand Also it can use 3 d modeling software to optimize, the 3D printing device for sand coated iron mould type core is by silica sand and inorganic bond Agent or a small amount of organic binder are formed by laser 3D printing.

That is, a kind of inorganic environmental protection 3D printing of micro- exhaust passage of band is quickly produced on swage by 3D printing technique Device for sand coated iron mould type core saves the mold and equipment (including the auxiliary devices such as heating) of coremaking and moulding, eliminates conventional cast and work as In mold design and manufacturing process, basic realize cast without modelling.In addition, because the application using inorganic binder or A small amount of organic binder can substantially reduce the discharge such as exhaust gas and dust.

Detailed description of the invention

The application combines following attached drawing and detailed description to will be apparent and be readily appreciated that, in attached drawing:

Fig. 1 is to be used to print the printing device for covering model sand mold core according to the application；

The detailed view of a part for covering sand that Fig. 2 is printed for the printing device according to Fig. 1；

Fig. 3 is the more detailed diagram according to the part for covering model sand mold core of the application；

Fig. 4 be include gas exhaust schematic diagram according to the sandbox for covering model sand mold core of the application in casting process；

Fig. 5 is the schematic diagram of tradition sandbox used in casting process；And

Fig. 6 is the schematic diagram covered after sand sandbox and mass production that tradition sandbox shown in Fig. 5 is improved to the application.

Specific embodiment

Exemplary embodiment disclosed in the present application is more fully described below with reference to accompanying drawings.Although showing this in attached drawing Disclosed exemplary embodiment, it being understood, however, that can realize the disclosure without the reality that should be illustrated here in a variety of forms Example is applied to be limited.It is to be able to thoroughly understand the application on the contrary, providing these embodiments, and can be by the application's Range is completely communicated to those skilled in the art.

Fig. 1 shows the printing device 100 for 3D printing device for sand coated iron mould type core according to the application, the printing device 100 include pedestal 1 and stand on above pedestal and along track 15 in figure moveable portal frame 2 on direction shown in arrow Y, The three-dimensional mobile work platform 4 for being provided with print platform 3 on pedestal 1 and being placed on print platform 3, article to be printed are placed in the three-dimensional In mobile work platform 4.Laser print apparatus 5 is arranged on the portal frame 2.Portal frame 2 has above three-dimensional mobile work platform 4 And the horizontal guide rail 6 parallel with three-dimensional mobile work platform 4, horizontal movement supporting table 8 are carried out on the horizontal guide rail 6 such as arrow in figure Horizontal movement shown in head X, has vertical guide groove in horizontal movement supporting table 8, carries the vertical motion branch of laser print apparatus 5 Support platform 7 carries out the vertical motion as shown in arrow Z in figure in the vertical guide groove, so that laser print apparatus 5 can be into The comprehensive movement of row.

The laser print apparatus 5 is connected with laser 11, and mixer 10 is connected to laser print apparatus 5 with to laser printing Device 5, which supplies, mixed covers sand material.Gas source 12 is connected with mixer 10 to help material to be mixed.In mixer 10 Equipped with multiple supply openings for feeding precoated sand material and binder respectively, such as silica sand supply mouth 13 and inorganic binder supply Mouth 14.

The printing device 100 also has control system 9, according on the article and different process conditions to be printed, The operation of laser print apparatus 5, laser 11, gas source 12 and mixer 10 is controlled respectively.

The manufacturing process that above-mentioned printing device 100 used herein carries out device for sand coated iron mould type core is as follows, it is first determined institute The product specification to be cast (including size, material, technique requirement etc.)；Then it is carried out according to identified product specification corresponding Products C AD design, designs the design parameter of product；Product is used cooperatively according to the design parameter of identified product Foundry cast iron mould carry out three dimensional design；Cover according to the parameter of swage and the parameter of final products the three dimensional design of sand, The data hierarchy of the three dimensional design is generated into scanning track for printing device use；Sand material is covered into manufacture as needed Various composition materials are loaded into mixer by design proportion, spray skill for example, by 3DP adhesive with printing device 100 Art and SLS Selective Laser Sintering print on swage and cover sand, to form preliminary type core, then removing type core On the fluffing of moulding sand and coat, be made device for sand coated iron mould type core.The type core can be used for the manufacturing process of next step, for example, lower core, mould assembling, Casting, to obtain final casting.

Traditional swage sand-covering technique can only the relatively simple product of making space structure, and use 3D printing device for sand coated iron mould type Core can then manufacture the labyrinth that traditional handicraft is difficult to or even can not manufacture.

But in traditional swage sand-covering technique, sand core and sand mold do not have gas permeability, in foundry production, due to high temperature Get angry generation gas can not exclusion type chamber in time, easily cause the injurous defects such as product air holes pin hole, product is direct when serious It scraps.

Therefore, the application is improved on this basis, during sand is covered in 3D printing, is manufactured in covering sand A kind of micro- exhaust passage out, micro- exhaust passage are formed by connecting by the microchannel to interconnect, and such type core is being cast When casting, the exhaust passage Quick air-discharge being arranged by micro- exhaust passage and sandbox die joint can effectively improve casting mold Gas permeability, reduction, which is felt suffocated, gets angry, and bleb defect is avoided to generate, and improves casting total quality.

In three-dimensional mobile work platform 4 shown in Fig. 1, the device for sand coated iron mould type core 20 that 3D printing goes out is schematically illustrated, The amplification diagram of a part of the device for sand coated iron mould type core 20 is shown in Figure 2, logical to schematically show the micro- exhaust covered in sand Road 23.

The device for sand coated iron mould type core 20 includes that one layer on the surface of swage 21 of swage 21 and 3D printing covers sand 22, covers mould Design has several micro- exhaust passages 23 in sand 22.This exhaust passage 23 slightly is according to the parameter of swage and the ginseng of final products Number cover during the three dimensional design of sand and will the three dimensional design data hierarchy generate scanning track during It carries out, can also be realized by covering the material selection of sand.

Fig. 3 shows micro- exhaust passage 23 and the gas flow paths covered in sand 22 with the amplification of greater proportion 24。

The shapes and sizes of micro- exhaust passage 23 can be designed according to the material and size to be poured, as long as this is slightly Exhaust passage 23 can concur, and the gas generated in casting process is transported to the die joint between sandbox to transmit To sandbox outside.In practice, on the one hand it is round, rectangular, rectangle, polygon that micro- exhaust passage 23 can be designed as to section The channel of shape etc., micro- exhaust passage 23 or irregular shape, but be interconnected between each micro- exhaust passage 23, and It is connected to die joint.On the other hand, micro- exhaust passage 23 can be formed by covering the material selection of sand itself, for example, covering Sand 22 is using porous material or is made for porous structure, and hole therein is interconnected, that is, constitutes micro- exhaust passage 23。

Fig. 4, which is shown, moves towards schematic diagram according to air-flow of the device for sand coated iron mould type core of the application in casting process.As schemed Show, casts the two parts i.e. top box and nowel of sandbox respectively by constituting according to the device for sand coated iron mould type core of the application, top box includes Swage 21 and cover sand 22, nowel includes swage 21 ' and covers sand 22 ', after sandbox is combined together, cover sand 22 and 22 ' it Between form die cavity, for being poured liquid, the gas that generates in casting process can be as shown in arrow 24 in Fig. 4 along covering in sand Micro- exhaust passage flowing, is discharged finally by the gap of the die joint between upper nowel.

Device for sand coated iron mould type core is formed and 3D printing goes out and covers sand 22 on the outer surface of swage 21, therefore covers sand 22 Thickness, which can according to need, to be selected, as shown in figure 4, the thickness degree for covering sand 22 is very small for entire mold, It can be, for example, to be less than 7mm.

Fig. 5 shows 40 structural schematic diagram of sandbox for referring to printing casting mold formation by traditional 3D tree, by top box 41 under Case 42 is constituted, wherein type core directly prints as unit of top box 41 and 42 the inside of nowel are by layer, it can be seen that this type core, it is whole Body sand using amount is big, and printing effect is low, and the time is long, and energy consumption is high, and practical application is of poor benefits, and cost is very high.

It can be seen that the type core of the application by comparison from the Structure Comparison of Fig. 4 and Fig. 5, it is clear that be greatly saved and use sand Amount.

In addition, the device for sand coated iron mould type core of the application is also suitable for mass production, and, it is only necessary on the basis of existing swage 21 On be transformed it is i.e. implementable.

Fig. 6 shows the structure chart on the basis of traditional sandbox shown in Fig. 5 after improved device for sand coated iron mould type core volume production, only needs It is printed on swage 21,21 ' by printing device 100 shown in FIG. 1 and covers sand 22,22 ', either single-piece is small Most flexibility manufacture production can be achieved in batch production or big medium quantity batch processing, and cost is far below conventional casting techniques.It is right In new product Single unit job lot production, it is not necessarily to be new product designs Special iron sand case, general swage sandbox can be used for carrier, By 3D printing moulding/core, product is obtained after being poured, and is reduced significantly from drawing to the development cycle in kind, is reduced material Consumption.When product structure etc. needs redjustment and modification, can according to client's needs, quickly adjust without generate it is additional at This.After produced exemplar obtains client's approval, all purpose flask can be changed to and the matched Special iron sand case of product.

As for the material for covering sand 22 of the application, inorganic material, such as silicate can be selected, as moulding sand, And these inorganic material can be mixed in mixer 10 with inorganic bond, form 3D printing covers sand material. It is the problem that when overcoming in traditional device for sand coated iron mould because using organic resin sand as moulding sand, i.e., complicated in production When cast article, because the limitation of sand mobility can penetrate sand it is not firm due to cause product directly to scrap the problem of.In addition, traditional Thermosetting organic resin in technique is exactly exhaust gas emission problem as the disadvantage of binder, and organic resin multi-source is in petroleum Product or agricultural chemicals, price are high, and when moulding, coremaking, VOC value is high, endanger operator's health, in casting process, generate big Pernicious gas is measured, environment is polluted.These, which all pass through the micro- exhaust passage 23 designed in sand that covers in the application, is had The solution of effect.

The application uses 3D printing device for sand coated iron mould type core, is sintered during printing by laser selective, instantaneous solid Change, eliminate huge heating equipment, reduces labor intensity of workers；Swage sandbox is only needed, swage mold is eliminated Production, cost substantially reduce；Due to eliminating the required time that is heating and curing, production efficiency is greatly improved, and is suitble to high-volume raw It produces.

Although describing the application by taking device for sand coated iron mould as an example, i.e., 3D printing goes out to cover sand on swage, the material of swage Material can be other materials, as long as its fusing point is higher than casting temperature and has enough mechanical strengths, that is, can select Other high temperature resistance and high strength metal materials, are not limited to iron.

Obviously, those skilled in the art can carry out various modification and variations without departing from this Shen to the embodiment of the present application Spirit and scope please.In this way, if these modifications and variations belong to the range of claims hereof and its equivalent technologies Within, then the application is also intended to include these modifications and variations.

Claims (8)

1. a kind of device for sand coated iron mould type core characterized by comprising

The outer surface of metal mold, the metal mold has shape corresponding with shape of product to be cast；And

It is covered on the outer surface of the metal mold and covers sand, wherein

The sand that covers is formed on the outer surface of the metal mold by 3D printing equipment, is formed in described cover in sand Several micro- exhaust passages, micro- exhaust passage are interconnected and are connected in casting with the gap at sandbox die joint, institute It states micro- exhaust passage to be formed during carrying out 3D printing using 3D printing equipment, several micro- exhaust passages are formed in whole It is covered in sand described in a so that the gas generated during casting pouring is discharged to outside sandbox along the exhaust passage.

2. device for sand coated iron mould type core as described in claim 1, which is characterized in that shape, the size of several micro- exhaust passages And the distribution in sand is being covered by determining for the CAD modeling process of 3D printing equipment.

3. device for sand coated iron mould type core as described in claim 1, which is characterized in that the sand that covers is by with the inorganic of certain particle size Material is formed or the inorganic material is formed porous structure, the gap or described more between the particle of the inorganic material The aperture of pore structure collectively forms the exhaust passage.

4. device for sand coated iron mould type core as claimed in any one of claims 1-3, which is characterized in that the metal mold by high-intensitive and The metal of resistance to casting high temperature is made.

5. device for sand coated iron mould type core as claimed in any one of claims 1-3, which is characterized in that the metal mold is formed into reality The heart or hollow structure.

6. device for sand coated iron mould type core as claimed in any one of claims 1-3, which is characterized in that the section of micro- exhaust passage For circle, ellipse, rectangle, polygon or irregular shape.

7. device for sand coated iron mould type core as claimed in any one of claims 1-3, which is characterized in that the thickness for covering sand is big About 7mm.

8. device for sand coated iron mould type core as claimed in claim 4, which is characterized in that the metal mold is made of cast iron.