CN107876696A - Composite sand mould preparation method is used in 3D printing casting - Google Patents
Composite sand mould preparation method is used in 3D printing casting Download PDFInfo
- Publication number
- CN107876696A CN107876696A CN201710986058.1A CN201710986058A CN107876696A CN 107876696 A CN107876696 A CN 107876696A CN 201710986058 A CN201710986058 A CN 201710986058A CN 107876696 A CN107876696 A CN 107876696A
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- Prior art keywords
- sand
- printing
- floor
- facing
- cloth
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
Abstract
The invention provides a kind of preparation method of 3D printing casting composite sand mould, its feature is：On the basis of conventional printing device, track cloth sand device is set up, facing sand layer is manufactured in sand mold surface of internal cavity using track cloth sand mode is taken turns, recycles existing process, floor sand layer is manufactured on the outside of facing sand layer, finally gives the composite sand mould being made up of two constituent elements of facing sand and floor sand.Using the principle of the invention, multicomponent composite sand mould can also be printed.The preparation problem of two constituent elements of 3D printing and two constituent element above composite sand moulds is this method solve, more adapts to ferrous materials casting demand, existing 3D printing sand mold technology is stepped to scientific, economization further.
Description
Technical field
The present invention relates to a kind of 3D printing casting composite sand mould preparation method, is used for solving existing 3D printing casting
The constituent element Single-issue of sand mold.
Background technology
The development for developing into foundry engieering of 3D printing technique brings brand-new opportunities and challenges.Utilize 3D printing sand
Type, it is possible to achieve containerless casting, highly shortened casting cycle and improve casting dimension accuracy, realize digitlization system
Make.At present, 3D printing sand mold is broadly divided into：Binding agent is sprayed from hard (3DP) and the class method of selective laser sintering (SLS) two.
Binding agent is sprayed from hard Method of printing (3DP), and using roughing sand and binding agent as direct consumptive material, binding agent is sprayed by selectivity
Formed with sand mold.
Selective laser sintering Method of printing (SLS) is using precoated sand as consumptive material, by selective laser sintering, formed with
Sand mold.Reduce the cost to improve print speed, on the basis of SLS methods, also have using laser profile dead methods
(PIRP)。
Above-mentioned two classes 3D printing method can meet high-precision sand mold printing substantially, but a common drawback all be present, just
Being can only the constituent element sand mold of printing list one.Generally, ferrous materials casting sand mold is more using the compound of two constituent elements of facing sand and floor sand
Sand mold, the molding sand for pressing close to cast(ing) surface use fresh sand or high-quality sand, are referred to as " facing sand "；Molding sand away from cast(ing) surface uses
Old sand or low-quality sand, it is referred to as " floor sand ".The composite sand mould made using facing sand and floor sand combination, is most economical do
Method, and the gas forming amount of floor sand is few, good permeability, low intensity, is also beneficial to mitigate bleb and crackle tendency.
Just because of 3D printing can only the constituent element sand mold of printing list one, seriously constrain 3D printing sand mold technology in casting field
Commercial application.
The content of the invention
The invention provides a kind of 3D printing casting composite sand mould preparation method, and realizing to be prepared using 3D printing is had
Two and the composite sand mould of two or more constituent element, more adapt to ferrous materials casting demand, make existing 3D printing sand mold technology to
Scientific, economization steps further.
Technical solution of the present invention is as follows：
A kind of method that 3D printing prepares casting composite sand mould, it is characterised in that：In conventional 3D printing Equipment Foundations,
Track cloth sand device is set up, an aspect sand is laid in sand mold surface of internal cavity using track cloth sand mode is taken turns, facing sand is carried out immediately
Solidification；Existing process is recycled, floor sand is laid on the outside of facing sand layer, and floor sand is solidified；Finally give by facing sand and the back of the body
The composite sand mould of two constituent element compositions of sand, using present principles, can also print multicomponent composite sand mould.
In order to contrast the present invention, introducing three basic steps of conventional 3DP printing sand mold first, (Fig. 1 is conventional 3DP
Print sand mold basic step schematic diagram)：Ith step：Certain thickness roughing sand is uniformly laid using scraper plate principle.IIth step：Utilize spray
Black principle, selectivity spray binding agent is carried out to roughing sand under the control of the computer, is allowed to solidify.By successively cloth sand and successively spray is viscous
Agent is tied, finally the stack shaping in print area.IIIth step：It is by uncured roughing sand and solid using absorption or clearing apparatus
The sand mold separation of change, finally gives target product --- --- sand mold.The step of using selective laser sintering Method of printing (SLS)
Similarly.
The purpose of the present invention is realized by following measures：
The present invention is divided into five basic printing steps.Ith step：Using facing sand material, using track cloth sand device, along sand mold
Inner chamber shape line carries out track cloth sand.IIth step：Selectivity spray binding agent is carried out using ink ejecting method opposite sand material material, is allowed to solid
Change, forming face layer of sand.IIIth step：Using floor sand material, using scraper plate principle, the region beyond the layer of sand of opposite carries out cloth sand.The
IV step：Selectivity spray binding agent is carried out to floor sand material using ink ejecting method, is allowed to solidify, forms floor sand layer.Pass through track cloth
Facing sand and scraper plate cloth floor sand are combined mode, printing alternate, are finally piled into print area and forgive cured binary sand
Type and uncured floor sand.Vth step：Using absorption or clearing apparatus, by uncured floor sand and cured binary sand mold point
From finally giving the constituent element composite sand mould of target product --- --- facing sand/floor sand two.Fig. 2 is the present invention two constituent element complex sands of printing
Type basic step schematic diagram.
Comparison diagram 1 is as can be seen that the characteristic of the present invention is：Facing sand layer is realized by the Ith step in Fig. 2 and the IIth step
Make.Key point is to add track cloth sand device, and is coordinated with existing scraper plate sand arranging method.
(1) track cloth sand device designing points
(a) track cloth sand device structure principle chart is as shown in figure 3, track cloth sand device 1 can press under the control of the computer
Sand mold inner chamber shape line walking (X, Y-direction), trajectory error≤10 millimeter.
(b) layer of sand width adjustor 101 and sand layer thickness adjuster 102 are utilized, realizes that every layer of cloth sand thickness width is adjustable
Section；Wherein：Layer of sand cloth sand thickness can adjust, 0.1~3 millimeter of adjustable range, 5~100 millimeters of layer of sand width adjusting scope.
(2) cloth facing sand in track coordinates main points with scraper plate cloth floor sand
(a) by first cloth facing sand, rear cloth floor sand sequential analysis.(b) it is identical per aspect sand thickness h 1 and floor sand thickness h 2.(c)
Binding agent should be sprayed immediately to be solidified, facing sand layer is damaged during avoiding follow-up scraper plate cloth floor sand after the cloth facing sand of track.(d) in order to protect
The molded line dimensional accuracy of facing sand layer is demonstrate,proved, the width of each cloth facing sand should exceed beyond the shape line of inner chamber 1~10 millimeter (see Fig. 2 t),
Ensure most end form line precision using selectivity spray binding agent.(e) selection of facing sand and floor sand：In principle according to casting technique requirement
The species of facing sand and floor sand is selected, but to be adapted to conventional 3D printing requirement.Such as：SiO can be selected in facing sand2Content >=98%
The special sand such as high grade quartz sand or chromite sand, nice foundry sand；SiO may be selected in floor sand2Content relatively low common quartz sand or old sand.
(f) selection of binding agent：Usual facing sand layer and floor sand layer can select the binding agent and identical proportional quantity of identical type, if any
Different proportional quantities or different types of binding agent also may be selected in specific demand, facing sand layer and floor sand layer.
It is similar to spray binding agent Method of printing (3DP) using the technical process of selective laser sintering method (SLS), simply
Cured form is changed to laser sintered by spray binding agent.
Using the principle of the invention, multicomponent composite sand mould can also be printed, as shown in Figure 4, to meet Big Steel Castings steel sand
The special casting demand of type.
Compared with prior art, possessed advantage is as follows by the present invention：
(1) existing 3D printing can only the constituent element sand mold of printing list one, the present invention can print two constituent elements of facing sand/floor sand and answer
Sand mold or multiple constituent element composite sand moulds are closed, is more suitable for ferrous materials casting technique demand.
(2) present invention is on the basis of existing printing device and Method of printing, by increasing track cloth sand device, and with showing
Row printing technology method carries out organic cooperation, has good equipment and Process ba- sis, the theoretical foundation and application practice of early stage
Fully, it is easy to practical application.
(3) principle and basic step of the invention are suitable for existing spray binding agent from hard Method of printing (3DP), selection
Property laser sintered Method of printing (SLS) and laser profile failure Method of printing (PIRP).
Brief description of the drawings
Fig. 1 routines 3DP printing sand mold basic step schematic diagrames (being from left to right followed successively by the I, the II, III step).
Two constituent element composite sand mould basic step schematic diagrames of Fig. 2 present invention printings (be from left to right followed successively by the I, the II, III, IV,
IV step).
Fig. 3 cloth sand device structural representations in track of the present invention.
Fig. 4 present invention printing multicomponent composite sand mould structural representations.
Reference：1st, track cloth sand device, 2, inner chamber shape line, 3, facing sand, 4, solidification facing sand, 5, floor sand, 6, the solidification back of the body
Sand, 7, two constituent element composite sand moulds, 8, supporting plate, 9, roughing sand, 10, wheel profile line, 11, adhesive solidification, 12, sand mold, 101, layer of sand it is wide
Spend adjuster, 102, sand layer thickness adjuster.
Embodiment
Embodiment
With SiO2The high grade quartz sand of content >=98% is facing sand material, with SiO2The common quartz sand of content≤95% is
Floor sand material, granularity are 70/140；Using self-hardening furan resin as binding agent, addition 3%；From the rice diameter water wheels of ￠ 2.5
A certain piece of sand mold of machine runner casting is print object；Using 1000 × 1500 millimeters of spray binding agents with track cloth sand device
From hard printing device.
Ith step：Using facing sand material, using track cloth sand device, track cloth sand is carried out along sand mold inner chamber shape line, cloth sand is wide
30 millimeters of degree, every 0.25 millimeter of thickness degree.The width of facing sand exceeds beyond the shape line of inner chamber 5 millimeters.
IIth step：Opposite sand material material carries out selectivity spray binding agent, is allowed to solidify, forming face layer of sand.Significant surface layer of sand is wide
Spend and be：30-5=25 millimeters.
IIIth step：Using floor sand material, using scraper plate principle, the region beyond the layer of sand of opposite carries out cloth sand, per thickness degree
0.25 millimeter.
IVth step：Selectivity spray binding agent is carried out to floor sand material, forms floor sand layer.Pass through track cloth facing sand and scraper plate cloth
Floor sand is combined mode, printing alternate, is finally piled into print area comprising cured binary sand mold and uncured
Floor sand.
Vth step：Using adsorbent equipment, uncured floor sand is separated with cured binary sand mold, finally gives target
The runner casting composite sand mould of product --- the constituent element of facing sand/floor sand two.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (5)
1. a kind of method that 3D printing prepares casting composite sand mould, it is characterised in that：In conventional 3D printing Equipment Foundations, increase
If track cloth sand device, an aspect sand is laid in sand mold surface of internal cavity using track cloth sand mode is taken turns, facing sand is consolidated immediately
Change；Existing process is recycled, floor sand is laid on the outside of facing sand layer, and floor sand is solidified；Finally give by facing sand and floor sand
The composite sand mould of two constituent element compositions, repeats the process, can print multicomponent composite sand mould.
2. the method for casting composite sand mould is prepared according to 3D printing described in claim 1, it is characterised in that：The track cloth sand
Device is walked by sand mold inner chamber shape line tracking under the control of the computer, trajectory error≤10 millimeter, and every layer of cloth sand width range 5~
100 millimeters, every layer of 0.1~3 millimeter of cloth sand thickness range.
3. the method for preparing casting composite sand mould according to the 3D printing of claim 1 or 2, it is characterised in that：Per aspect sand
Thickness is identical with floor sand thickness.
4. the method for preparing casting composite sand mould according to the 3D printing of claim 1 or 2, it is characterised in that：Each cloth cover
The width of sand should exceed beyond the shape line of inner chamber 1~20 millimeter, ensure most end form line precision using selectivity spray binding agent.
5. the method for casting composite sand mould is prepared according to 3D printing described in claim 1, it is characterised in that：Facing sand selects SiO2
Quartz sand, chromite sand or the nice foundry sand of content >=98%；Floor sand selects common quartz sand or old sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710986058.1A CN107876696A (en) | 2017-10-20 | 2017-10-20 | Composite sand mould preparation method is used in 3D printing casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710986058.1A CN107876696A (en) | 2017-10-20 | 2017-10-20 | Composite sand mould preparation method is used in 3D printing casting |
Publications (1)
| Publication Number | Publication Date |
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| CN107876696A true CN107876696A (en) | 2018-04-06 |
Family
ID=61781847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710986058.1A Pending CN107876696A (en) | 2017-10-20 | 2017-10-20 | Composite sand mould preparation method is used in 3D printing casting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108705033A (en) * | 2018-05-02 | 2018-10-26 | 北京机科国创轻量化科学研究院有限公司 | A kind of casting mold and its manufacturing method with hollow structure |
| CN108994257A (en) * | 2018-08-28 | 2018-12-14 | 宝鸡高新智能制造技术有限公司 | A kind of 3D printing forms the casting method of large-scale elaborate inner cavity component |
| CN110076289A (en) * | 2019-05-08 | 2019-08-02 | 同济大学 | A kind of 3D printing technique of sand mold manufacture |
| CN118455464A (en) * | 2024-05-08 | 2024-08-09 | 北京京城增材科技有限公司 | Large sand mould additive manufacturing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108705033A (en) * | 2018-05-02 | 2018-10-26 | 北京机科国创轻量化科学研究院有限公司 | A kind of casting mold and its manufacturing method with hollow structure |
| CN108994257A (en) * | 2018-08-28 | 2018-12-14 | 宝鸡高新智能制造技术有限公司 | A kind of 3D printing forms the casting method of large-scale elaborate inner cavity component |
| CN110076289A (en) * | 2019-05-08 | 2019-08-02 | 同济大学 | A kind of 3D printing technique of sand mold manufacture |
| CN110076289B (en) * | 2019-05-08 | 2020-01-31 | 同济大学 | 3D printing process for manufacturing sand molds |
| CN118455464A (en) * | 2024-05-08 | 2024-08-09 | 北京京城增材科技有限公司 | Large sand mould additive manufacturing device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20180406 |