CN114769547A - Chilling block for 3D printing sand mold and using method thereof - Google Patents
Chilling block for 3D printing sand mold and using method thereof Download PDFInfo
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- CN114769547A CN114769547A CN202210399403.2A CN202210399403A CN114769547A CN 114769547 A CN114769547 A CN 114769547A CN 202210399403 A CN202210399403 A CN 202210399403A CN 114769547 A CN114769547 A CN 114769547A
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- sand mold
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- sand
- chill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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- 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
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- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
Abstract
The invention relates to a chill for a 3D printing sand mold, which is formed by bonding molding sand and steel shots for casting through a binder, wherein the binder comprises resin and a curing agent. The invention further discloses a using method of the chilling block for the 3D printing sand mold, wherein a resin and curing agent bi-component bonding system is adopted to bond and form the steel shot and the molding sand for casting, and the prepared chilling block for the 3D printing sand mold has the strength required by the cast chilling block and can play the chilling role of the chilling block. The chiller for the 3D printing sand mold disclosed by the invention is not limited by a casting structure, a special conformal chiller is not designed for a casting with a complex structure, the production period is shortened, and the production cost is saved. The chill for the 3D printing sand mold disclosed by the invention can be designed into any shape according to the structural requirement of a casting, and can be solidified with the sand mold into a whole without being bonded, so that the quality of the casting is improved.
Description
Technical Field
The invention relates to the technical field of chills, in particular to a chill for a 3D printing sand mold and a using method thereof.
Background
The defects of shrinkage porosity and shrinkage cavity are easily generated at the thick wall part in the production process of the casting, so that the casting is scrapped. In order to effectively reduce and avoid the rejection risk of the castings caused by shrinkage porosity and shrinkage cavity defects in the process of process design, a chilling block is placed at a position where the defects are easy to generate in advance so as to improve the cooling speed at the position and prevent the castings from generating shrinkage porosity and shrinkage porosity.
The 3D printing technology is widely used in the casting industry, is particularly suitable for castings with small tonnage and complex structures, and is a great technical problem due to the limitation of the existing 3D printing sand mold casting technology, namely the placement of chills in the 3D printing sand mold process. In the production process of 3D printing sand mould, the chill needs to be placed after psammitolite, sand mould printing are accomplished. Need reserve the chill in psammitolite, sand mould and hold the chamber, the sand mould is printed the completion back, bonds the chill in corresponding cavity position. The method has two defects, the requirement on the precision of the 3D printing sand mold is high, and the size of the chilling block has errors due to repeated use of the chilling block or the heat affected part in the processing process. On one hand, the chilling blocks are too large to enter the cavities, and the sand mold needs to be polished on site. On the other hand, too small cold iron is placed in the cavity, and the gap is too large, so that the flash of the casting is large, or the molten iron enters the flash and contacts with the adhesive to generate gas, and the casting has the defect of gas choking holes.
Particularly, for castings with high production difficulty, such as thin walls, complex structures, special structure requirements and the like, the arrangement of the chilling blocks is more difficult, and the problem that the chilling blocks are unstable in bonding and fall into a cavity and the problem that direct-cooling chilling blocks at special positions cannot be placed easily occur.
Disclosure of Invention
Therefore, it is necessary to provide a chill for a 3D printing sand mold, which is easy to stably set and does not need to be bonded to the sand mold, and a method of using the same, in order to solve the problems that the chill is difficult to set in the 3D printing sand mold and the chill is not stably bonded to the sand mold.
In order to solve the problems, the invention adopts the following technical scheme:
the embodiment of the invention discloses a chilling block for a 3D printing sand mold, which is arranged in a sand mold for casting, wherein the chilling block for the 3D printing sand mold is formed by bonding molding sand and steel shots for casting through a bonding agent, and the bonding agent comprises resin and a curing agent.
Further, the mass percent of the resin is 1.4-1.8%, the mass percent of the curing agent is 0.7-1.0%, the mass percent of the molding sand for casting is 60-70%, and the mass percent of the steel shot is 30-40%.
Further, the resin is a furan resin.
Further, the molding sand for casting is chromium ore sand for casting.
Further, the curing agent is a sulfonic acid curing agent.
Further, the steel shot is strip-shaped.
In a second aspect, the method for using the chill for the 3D printing sand mold includes the following steps:
preparing materials: uniformly stirring the resin, the curing agent, the molding sand for casting and the steel shot to obtain a mixture;
filling: arranging a cavity for containing the chilling block at the position, needing chilling, of the 3D printing sand mold, filling the mixture into the cavity, and compacting and strickling the mixture;
hardening: the mixture to be filled into the cavity hardens and acts as a chill during casting.
Further, the cavity is along deviating from 3D prints sand mould direction cross-section taper.
Further, the time interval between the stirring step and the filling step is not more than 1 hour.
Further, the 3D printing sand mold is statically baked for at least 5 minutes or is statically placed in air for at least 15 minutes.
The technical scheme adopted by the invention can achieve the following beneficial effects:
the invention discloses a chilling block for a 3D printing sand mold, which adopts a resin and curing agent bi-component bonding system to bond and form steel shots and molding sand for casting, and the prepared chilling block for the 3D printing sand mold has the strength required by casting the chilling block and can play the chilling role of the chilling block. According to the chill for the 3D printing sand mold, disclosed by the invention, the raw materials are casting common materials, the materials are convenient to obtain, the price is low, and the production cost is effectively reduced; the chilling block for the 3D printing sand mold has a chilling effect during pouring, is cleaned together with sand in a box-making process after pouring, is simple, convenient and efficient, and greatly improves subsequent cleaning efficiency. The chiller for the 3D printing sand mold disclosed by the invention is not limited by a casting structure, a special conformal chiller is not designed for a casting with a complex structure, the production period is shortened, and the production cost is saved. The chilling block for the 3D printing sand mold disclosed by the invention can be designed into any shape according to the structural requirement of a casting, and can be solidified with the sand mold into a whole without being bonded, so that the chilling effect is improved, and the quality of the casting is improved.
Drawings
FIG. 1 is a schematic structural diagram of a cylinder casting according to an embodiment;
FIG. 2 is a schematic structural diagram of a 3D printing sand mold for the cylinder casting in FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 2;
fig. 4 is a sectional view of the sand mold of fig. 2 after a chill for a 3D printing sand mold disclosed in the embodiment of the present invention is disposed thereon.
Description of the reference numerals:
1-cylinder casting, 2-chilling block, 3-sand mould and 4-cavity.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention discloses a chilling block for a 3D printing sand mold, which is obtained by bonding molding sand and steel shots for casting through a resin and curing agent bi-component bonding system. Compared with the existing chilling block for casting, the chilling block for 3D printing sand mould disclosed by the embodiment of the invention is not limited by the structure of the casting, is not required to be bonded with the sand mould, and is particularly suitable for castings with complex structures and/or thin walls. The chilling block for the 3D printing sand mold disclosed by the embodiment of the invention comprises, by mass, 1.4% -1.8% of resin, 0.7% -1.0% of curing agent, 60% -70% of molding sand for casting and 30% -40% of steel shots.
Specifically, the resin is furan resin, and the curing agent is a sulfonic acid curing agent; the molding sand for casting is chromium ore sand for casting, the chromium ore sand has high fire resistance, and the chromium ore sand per se is subjected to solid-phase sintering in the pouring process to prevent molten metal from permeating, so that mechanical sand sticking is prevented; the steel shot is in a long strip shape, preferably steel wire cut shot with the particle size of 2-4 mm, the long strip-shaped steel shot is easier to stir and mix with resin and curing agent, and the strength of the long strip-shaped steel shot is higher after the long strip-shaped steel shot is formed. After the chill made by taking the chromium ore sand and the steel shot as raw materials is poured, the defects of sand sticking, chill choking and the like do not exist on the contact surface of the chill, the resin and the curing agent after pouring volatilize at high temperature, the residual chromium ore sand and the steel shot are simply, conveniently and efficiently cleaned together with the sand in the boxing process, the subsequent cleaning efficiency of the castings is greatly improved, the process of designing special conformal chills is avoided to the greatest extent, the production period is shortened, and the production cost is saved.
Example one
As shown in fig. 1, a thin-wall nodular cast iron cylinder casting 1 with a complex structure is easy to form shrinkage cavity and shrinkage porosity defects on the inner wall of the cylinder casting 1, so that the shape-following chill 2 needs to be arranged on the inner wall of the cylinder casting 1 to control the molten metal solidification process, prevent the defects from forming and ensure the production quality of the cylinder casting 1. During design, a cavity 4 for accommodating the chilling block 2 is designed on the sand mold 3, the sand mold 3 shown in the figure 2-3 is produced in a 3D printing mode according to the design, a plurality of cavities 4 are formed in the periphery of the sand mold 3, and the sand mold 3 and the lower sand mold are assembled to form a cavity for accommodating a casting.
Preferably, the cavity 4 is provided with a slope along the circumference so that the section of the cavity 4 along the direction departing from the sand mold 3 is gradually reduced, and the chill 2 is prevented from falling to the cavity under the influence of gravity after the mold is turned over and assembled; the inclination is optimally 2-10 deg.
The use method of the chiller 2 comprises the following steps:
s1, preparing materials: weighing 22g of furan resin, 11g of sulfonic acid curing agent, 939g of chromium ore and 527g of steel wire cut pellets for later use; the density of the chromium ore is 2.675g/cm3The density of the steel wire cut pellets is 4.501g/cm3。
S2, mixing materials: firstly, mixing the weighed chromium ore sand and the cut steel wire shot, then adding the furan resin and the curing agent, stirring and uniformly mixing. It should be noted that the mixture is used within 1 hour to prevent the mixture from hardening in air and should be prepared again if the mixture is left for more than 1 hour.
S3, filler: the mixture is filled into a cavity 4 provided on the sand mold 3, and is compacted and scraped off.
S4, hardening: the sand mold 3 after being filled is put in place and is kept still in the air for at least 20 minutes; for the part with thicker filler, natural gas and the like can be used for standing and baking for at least 5 minutes. And (3) preparing the chilling block 2 after the filler is completely hardened, wherein the chilling block 2 is arranged in the sand mould 3 and is shaped along with the sand mould 3.
Further, the surface of the sand mold 3 exposed from the chill 2 is coated with the coating, the coating completely covers the coated surface, and the sand mold 3 can be moved and turned over after the coating is completely dried.
In the embodiment, the sand mold 3 and the lower sand mold matched with the sand mold are combined and cast, the inner wall of the produced cylinder casting 1 has no defects of shrinkage cavities, shrinkage porosity, choking air holes and the like, the surface quality of the cylinder casting is good, and various mechanical performance indexes meet the production requirements.
Example two
Different from the first embodiment, the raw material ratio of the chilling block 2 is 27g furan resin, 15g sulfonic acid curing agent, 1040g chromium ore sand and 518g steel shot, and the steel shot in the embodiment is used in the casting shot blasting process.
It should be noted that other steps are the same as those in the first embodiment, and this embodiment is not described again.
In the embodiment, the sand mold 3 and the lower sand mold matched with the sand mold are combined and cast, the inner wall of the produced cylinder casting 1 has no defects of shrinkage cavities, shrinkage porosity, choking air holes and the like, the surface quality of the cylinder casting is good, and various mechanical performance indexes meet the production requirements.
EXAMPLE III
The cavity 4 in the above embodiment can be added to the sand mold 3D printing design scheme as a sand mold structure at the beginning of design, and is synchronously set and printed with the 3D printing sand mold.
Example four
The cavity 4 in the above embodiment may be mechanically dug out as a sand mould structure after sand moulding.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a 3D prints chill for sand mould, sets up in foundry sand mould, its characterized in that, 3D prints chill for sand mould and is formed by foundry sand and shot through the binder bonding, the binder includes resin and curing agent.
2. A cold iron for a 3D printing sand mold according to claim 1, wherein the resin is 1.4-1.8% by mass, the curing agent is 0.7-1.0% by mass, the molding sand for casting is 60-70% by mass, and the steel shot is 30-40% by mass.
3. The chiller for a 3D printing sand mold according to claim 1, wherein the resin is furan resin.
4. A chill for a sand mold for 3D printing according to claim 1, wherein the molding sand for casting is chrome ore for casting.
5. A chill for a sand mold for 3D printing according to claim 1, wherein said curing agent is a sulfonic acid curing agent.
6. A chill for a sand mold for 3D printing according to claim 1, wherein said steel shot is long-strip shaped.
7. The use method of the chilling block for the 3D printing sand mold according to any one of claims 1 to 6 is characterized by comprising the following steps:
preparing materials: uniformly stirring the resin, the curing agent, the molding sand for casting and the steel shots to obtain a mixture;
filling: arranging a cavity for containing the chilling block at the position, needing chilling, of the 3D printing sand mold, filling the mixture into the cavity, and compacting and strickling the mixture;
hardening: the mixture to be filled into the cavity hardens and acts as a chill during casting.
8. A method of using a chill for a 3D printing sand mold according to claim 7, wherein said cavity has a gradually decreasing cross-section in a direction away from said 3D printing sand mold.
9. A use method of a cold iron for a 3D printing sand mold according to claim 7, wherein the time interval between the material preparation step and the filling step is not more than 1 hour.
10. The method for using a chill for a 3D printed sand mold according to claim 7, wherein in said hardening step, said 3D printed sand mold is left to bake the filler sites for at least 5 minutes or left to stand in air for at least 15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210399403.2A CN114769547A (en) | 2022-04-18 | 2022-04-18 | Chilling block for 3D printing sand mold and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210399403.2A CN114769547A (en) | 2022-04-18 | 2022-04-18 | Chilling block for 3D printing sand mold and using method thereof |
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| CN114769547A true CN114769547A (en) | 2022-07-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
| CN117020121A (en) * | 2023-10-10 | 2023-11-10 | 陇东学院 | 3D printing sand mold chill device and preparation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567353A (en) * | 2012-07-30 | 2014-02-12 | 大连远景铸造有限公司 | Steel moulding sand and manufacturing technology thereof |
| CN103909223A (en) * | 2014-04-10 | 2014-07-09 | 国营第六一六厂 | Collapsible cold iron composite material and application method thereof |
| CN104308156A (en) * | 2014-11-13 | 2015-01-28 | 四川南车共享铸造有限公司 | Composition for three-dimensional print casting and applications thereof |
| US20180221942A1 (en) * | 2017-02-06 | 2018-08-09 | Fisher Controls International Llc | Mold body with integrated chill |
| CN108421960A (en) * | 2018-03-19 | 2018-08-21 | 河北硕凯铸造有限公司 | One kind is with type chill and its preparation process |
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
-
2022
- 2022-04-18 CN CN202210399403.2A patent/CN114769547A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567353A (en) * | 2012-07-30 | 2014-02-12 | 大连远景铸造有限公司 | Steel moulding sand and manufacturing technology thereof |
| CN103909223A (en) * | 2014-04-10 | 2014-07-09 | 国营第六一六厂 | Collapsible cold iron composite material and application method thereof |
| CN104308156A (en) * | 2014-11-13 | 2015-01-28 | 四川南车共享铸造有限公司 | Composition for three-dimensional print casting and applications thereof |
| US20180221942A1 (en) * | 2017-02-06 | 2018-08-09 | Fisher Controls International Llc | Mold body with integrated chill |
| CN108421960A (en) * | 2018-03-19 | 2018-08-21 | 河北硕凯铸造有限公司 | One kind is with type chill and its preparation process |
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
| CN117020121A (en) * | 2023-10-10 | 2023-11-10 | 陇东学院 | 3D printing sand mold chill device and preparation method |
| CN117020121B (en) * | 2023-10-10 | 2023-12-22 | 陇东学院 | 3D printing sand mold chill device and preparation method |
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