CN111590029B - Method for setting chilling blocks in 3D printing sand core - Google Patents
Method for setting chilling blocks in 3D printing sand core Download PDFInfo
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- CN111590029B CN111590029B CN202010311073.8A CN202010311073A CN111590029B CN 111590029 B CN111590029 B CN 111590029B CN 202010311073 A CN202010311073 A CN 202010311073A CN 111590029 B CN111590029 B CN 111590029B
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- cavity
- chilling block
- sand core
- printing sand
- chilling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
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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
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of casting, and particularly relates to a method for setting chills in a 3D printing sand core, which comprehensively considers the feasibility of placing the chills in the process design process, provides several methods for placing the chills, including the design of fit clearance, a treatment method for the blockage problem in the flow coating process, a method for placing the chills of a thin-wall casting and a treatment method for the problem of easy falling of the chills, and aims to solve the problem of difficult placement of the chills of the 3D printing sand core and further embody the advantages of the 3D printing sand core.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a method for setting a chilling block in a 3D printing sand core.
Background
Nowadays, the 3D printing technology is widely used in the casting industry, is particularly suitable for castings with small tonnage and complex structures, but compared with the traditional casting method, the 3D printing technology has some defects, one of the problems which is difficult to solve is the placement of the chiller, the chiller is more important in the casting process design, and the chiller is adopted in the process design of basically all castings.
3D prints psammitolite precision higher, nevertheless because the chilling block of actual scene is because of using repeatedly and processing coarse influence, the size of chilling block is not accurate, leads to unable embedding smoothly to 3D and prints the psammitolite, consequently need further processing or repaiies 3D and prints the psammitolite, just can imbed the chilling block to the 3D psammitolite, and the power consumption consuming time like this seriously influences the precision that 3D printed the psammitolite and the precision of pouring foundry goods, finally influences the foundry goods quality.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for setting chills in a 3D printing sand core, comprehensively considers the feasibility of placing the chills in the process design process, and provides a plurality of methods for placing the chills, including the design of fit clearance, a treatment method for the blocking problem in the flow coating process, a method for placing the chills of thin-wall castings and a treatment method for the problem of easy occurrence of the shedding of the chills, aiming at solving the problem of difficult placing of the chills of the 3D printing sand core and further embodying the advantages of the 3D printing sand core.
A method for setting chilling blocks in a 3D printing sand core comprises the following steps:
designing a position for placing a chiller on the 3D printing sand core according to the structure of the casting, arranging a chiller cavity on the position for placing the chiller, wherein the shape of the chiller cavity is matched with that of the chiller, and a gap is reserved between the chiller cavity and the chiller; and a chiller is embedded in the chiller cavity.
In one embodiment, the chiller is cylindrical, when the type of the chiller is 60mm x 60mm and 80mm x 80mm, the clearance between the chiller cavity and the chiller in the diameter direction is 2 mm-3 mm, and the clearance in the length direction is 3 mm-4 mm; when the models of the chilling blocks are phi 100mm x 100mm and phi 100mm x 150mm, the clearance between the chilling block cavity and the chilling block in the diameter direction is 4 mm-5 mm, and the clearance in the length direction is 5 mm-6 mm. Through reserving the clearance between chill chamber and the chill, can make the smooth embedding chill intracavity of chill, the clearance design must be reasonable, and the clearance is too little inoperative, and the too big chill of clearance can't imbed the chill intracavity, because the chill model is big more, size deviation is big more, therefore the clearance volume increases along with the increase of chill size.
In one embodiment, before the step of embedding the chilling blocks in the chilling block cavity, a lost foam tool is embedded in the chilling block cavity, then the 3D printing sand core is subjected to flow coating, the lost foam tool is taken out, and the chilling blocks are embedded in the chilling block cavity. Because the flow coating in-process, coating can flow into the chill intracavity, leads to the chill chamber size to reduce, consequently before carrying out the flow coating operation to 3D printing psammitolite, adopts the disappearance mould frock to inlay in the chill intracavity, can prevent effectively that coating from flowing into the chill intracavity, waits to flow the coating operation and accomplishes the back, takes out the disappearance mould frock, imbeds the chill in the chill intracavity again.
Further, the shape of the lost foam tooling is matched with that of the chill cavity; the material of the lost foam tooling adopts a lost foam, so that the lost foam tooling can be repeatedly used.
Further, the clearance between the lost foam tooling and the chill cavity is 2-3 mm; the length of the lost foam tooling is 15 mm-20 mm longer than that of the chilling block, so that the lost foam tooling can be taken out conveniently after the flow coating operation is finished.
In one embodiment, when the 3D printing sand core is used for casting the blade type thin-wall casting, the thickness of a cavity of the 3D printing sand core is smaller than the length of a chill, the cavity of the 3D printing sand core is communicated with a chill cavity, a chill placing groove is arranged on the outer surface of the sand core far away from the cavity of the 3D printing sand core, the chill placing groove is communicated with the chill cavity, the chill is embedded into the chill cavity through the chill placing groove, one end surface of the chill is flush with the wall of the cavity of the 3D printing sand core, and then the compacted chill placing groove is filled with chromite sand.
Further, the size of the chiller placing groove is larger than that of the chiller, so that the chiller can be conveniently embedded into the chiller cavity through the chiller placing groove.
In one embodiment, when the cavity surface of the 3D printing sand core provided with the cold iron forms an acute angle with the horizontal plane, the cavity of the 3D printing sand core is communicated with the cold iron cavity, the cold iron placing groove is arranged on the outer surface of the sand core far away from the cavity of the 3D printing sand core, the cold iron placing groove is communicated with the cold iron cavity, an anti-falling tool is fixedly arranged on one end face of the cold iron, the cold iron is embedded into the cold iron cavity through the cold iron placing groove, the end face of the cold iron, far away from the anti-falling tool, is flush with the cavity wall of the 3D printing sand core, and the compacted cold iron placing groove is filled with chromite sand. When 3D printed the die cavity face that sets up the chill of psammitolite and when the acute angle was become with the horizontal plane, the chill drops from the chill intracavity owing to receiving the action of gravity, consequently need set up anti-drop frock in the one end of chill, pass through the chill standing groove embedding to the chill intracavity with the chill again in, with anti-drop frock card in the chill standing groove, and make keeping away from anti-drop frock terminal surface and the die cavity wall parallel and level of 3D printed the psammitolite of chill, adopt chromite sand to fill tight real chill standing groove again, treat the resin sand after the complete solidification, the chill is inlayed and is accomplished.
Further, the length direction of the anti-falling tool is larger than the section length of the chilling block.
Further, the anti-falling tool is made of square steel.
Further, the chilling block and the anti-falling tool are fixedly connected in a welding mode.
The invention provides the method for placing the chills in the 3D printing sand cores, overcomes the limitation of design of the chills in a plurality of process design processes, improves the stability of placing the chills, saves a large amount of physical power for field workers in the aspects of brushing the 3D printing sand cores and placing the chills, greatly shortens the time for inlaying the chills of the 3D printing sand cores, and saves the time for the whole production period of castings.
Drawings
FIG. 1 is a schematic view of a chill cavity and a chill gap;
FIG. 2 is a schematic view of a lost foam tooling assembly;
FIG. 3 is a schematic diagram of a 3D printing sand core for a thin-wall casting;
FIG. 4 is a schematic view of a 3D printing sand core with the cavity surface of the chill at an acute angle to the horizontal;
fig. 5 is a schematic view of the fixed connection between the chiller and the anti-falling tool.
10-3D printing a sand core; 20-chilling iron; 30-a chill cavity; 40-a lost foam tooling; printing the cavity surface of the sand core in 50-3D; 60-a chill holding groove; 70-anti-falling tool.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments are shown. 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 first embodiment is as follows:
the embodiment provides a method for setting a chilling block in a 3D printing sand core, please refer to fig. 1, which includes the following steps:
designing a position for placing a chilling block 20 on a 3D printing sand core 10 according to the structure of a casting, arranging a chilling block cavity 30 on the position for placing the chilling block 20, wherein the shape of the chilling block cavity 30 is matched with that of the chilling block 20, and a gap is reserved between the chilling block cavity 30 and the chilling block 20; a chiller 20 is embedded in the chiller cavity 30.
Specifically, the chiller 20 is cylindrical, and when the model of the chiller 20 is phi 60mm x 60mm and phi 80mm x 80mm, the diameter-direction gap between the chiller cavity 30 and the chiller 20 is 2mm to 3mm, and the length-direction gap is 3mm to 4 mm; when the model of the chilling block 20 is phi 100mm x 100mm and phi 100mm x 150mm, the clearance between the chilling block cavity 30 and the chilling block 20 in the diameter direction is 4 mm-5 mm, and the clearance in the length direction is 5 mm-6 mm. Through reserving the clearance between the chilling block cavity 30 and the chilling block 20, the chilling block 20 can be smoothly embedded into the chilling block cavity 30, the clearance design must be reasonable, the clearance is too small and does not work, the chilling block 20 with too large clearance can not be embedded into the chilling block cavity 30, and the clearance amount is increased along with the increase of the size of the chilling block 20 because the chilling block 20 is also large in size and larger in size deviation.
Example two:
when the flow coating operation needs to be performed on the surface of the 3D printing sand core and the chilling block is embedded, the embodiment provides a method for setting the chilling block in the 3D printing sand core, please refer to fig. 2, which includes the following steps:
designing a position for placing a chilling block 20 on a 3D printing sand core 10 according to the structure of a casting, arranging a chilling block cavity 30 on the position for placing the chilling block 20, wherein the shape of the chilling block cavity 30 is matched with that of the chilling block 20, and a gap is reserved between the chilling block cavity 30 and the chilling block 20; and embedding a lost foam tooling 40 into the chill cavity 30, then performing flow coating on the 3D printing sand core 10, taking out the lost foam tooling 40, and embedding the chill 20 into the chill cavity 30. Wherein the shape of the lost foam tooling 40 is matched with that of the chill cavity 30; the material of the lost foam tooling 40 adopts a lost foam, so that the lost foam tooling can be repeatedly used; the clearance between the lost foam tooling 40 and the chill cavity 30 is 2 mm-3 mm; the length of the lost foam tooling 40 is 15 mm-20 mm longer than that of the chilling block 20, so that the lost foam tooling 40 can be taken out conveniently after the flow coating operation is finished. Because in the flow coating process, the coating can flow into the chill cavity 30, resulting in the size reduction of the chill cavity 30, therefore before the 3D printing sand core 10 is subjected to flow coating operation, the lost foam tooling 40 is embedded into the chill cavity 30, so that the coating can be effectively prevented from flowing into the chill cavity 30, and after the flow coating operation is completed, the lost foam tooling 40 is taken out, and then the chill 20 is embedded into the chill cavity 30.
Example three:
when the 3D printing sand core is used for casting a blade type thin-wall casting, the embodiment provides a method for setting a chill in the 3D printing sand core, please refer to fig. 3, which includes the following steps:
designing a position for placing a chilling block 20 on a 3D printing sand core 10 according to the structure of a casting, arranging a chilling block cavity 30 on the position for placing the chilling block 20, communicating a cavity of the 3D printing sand core 10 with the chilling block cavity 30, matching the shape of the chilling block cavity 30 with that of the chilling block 20, and forming a gap between the chilling block cavity 30 and the chilling block 20; because the die cavity thickness that 3D printed psammitolite 10 is less than the length of chill 20, chill 20 is difficult to print the die cavity surface 50 embedding chill chamber 30 of psammitolite from 3D in, consequently need set up chill standing groove 60 at the psammitolite surface of keeping away from the die cavity that 3D printed psammitolite 10, chill standing groove 60 and chill chamber 30 intercommunication, and chill standing groove 60 size is greater than chill 20, is convenient for imbed chill 20 in chill chamber 30 through chill standing groove 60. Then, the chilling block 20 is embedded into the chilling block cavity 30 through the chilling block placing groove 60, one end face of the chilling block 20 is made to be flush with the cavity wall of the 3D printing sand core 10, and the chilling block placing groove 60 is filled and compacted by adopting chrome ore sand.
Example four:
when the cavity surface of the 3D printing sand core on which the chill is disposed and a horizontal plane form an acute angle, the embodiment provides a method for disposing the chill in the 3D printing sand core, please refer to fig. 4 and 5, which includes the following steps:
designing a position for placing a chilling block 20 on a 3D printing sand core 10 according to the structure of a casting, arranging a chilling block cavity 30 on the position for placing the chilling block 20, communicating a cavity of the 3D printing sand core 10 with the chilling block cavity 30, matching the shape of the chilling block cavity 30 with that of the chilling block 20, and forming a gap between the chilling block cavity 30 and the chilling block 20; because the cavity surface of the 3D printing sand core 10, on which the chilling block 20 is arranged, forms an acute angle with the horizontal plane, the chilling block 20 falls off from the chilling block cavity 30 under the action of gravity, therefore, the chill holding groove 60 is arranged on the outer surface of the sand core far away from the cavity of the 3D printing sand core 10, the chill holding groove 60 is communicated with the chill cavity 30, and an anti-drop tool 70 made of square steel is fixedly welded and connected to one end face of the chilling block 20, wherein the length direction dimension of the anti-falling tool 70 is larger than the section length dimension of the chiller 20, the chiller 20 is embedded into the chiller cavity 30 through the chiller placing groove 60, the anti-falling tool 70 is clamped in the chiller placing groove 60, and the end face of the chilling block 20, far away from the anti-falling tool 70, is flush with the cavity wall of the 3D printing sand core 10, the chilling block placing groove 60 is filled with chrome ore sand, and after the resin sand is completely solidified, the chilling block 20 is inlaid.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification 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 (9)
1. A method for setting a chilling block in a 3D printing sand core is characterized by comprising the following steps:
designing a position for placing a chiller on a 3D printing sand core according to the structure of a casting, arranging a chiller cavity on the position for placing the chiller, wherein the shape of the chiller cavity is matched with that of the chiller, and a gap is reserved between the chiller cavity and the chiller; the cavity of the 3D printing sand core is communicated with the chill cavity; embedding the chilling block in the chilling block cavity;
before the step of embedding the chilling block in the chilling block cavity, embedding a lost foam tool in the chilling block cavity, then performing flow coating on the 3D printing sand core, taking out the lost foam tool, and embedding the chilling block in the chilling block cavity.
2. The method for setting the chiller in the 3D printing sand core according to claim 1, wherein the shape of the lost foam tooling is matched with the chiller cavity.
3. The method for setting the chilling blocks in the 3D printing sand core according to claim 1, wherein the clearance between the lost foam tooling and the chilling block cavity is 2 mm-3 mm.
4. The method for setting the chilling block in the 3D printing sand core according to claim 1, wherein when the 3D printing sand core is used for casting a blade type thin-wall casting, the thickness of a cavity of the 3D printing sand core is smaller than the length of the chilling block, the cavity of the 3D printing sand core is communicated with the chilling block cavity, a chilling block placing groove is arranged on the outer surface of the sand core far away from the cavity of the 3D printing sand core, the chilling block placing groove is communicated with the chilling block cavity, the chilling block is embedded into the chilling block cavity through the chilling block placing groove, one end face of the chilling block is flush with the cavity wall of the 3D printing sand core, and then the chilling block placing groove is filled with chromite sand and compacted.
5. The method of setting chills in a 3D printing sand core of claim 4, wherein the chiller holding slot is larger in size than the chills.
6. The method for setting the chilling block in the 3D printing sand core according to claim 1, wherein when the cavity surface of the chilling block is arranged in the 3D printing sand core and a horizontal plane form an acute angle, the cavity of the 3D printing sand core is communicated with the chilling block cavity, a chilling block placing groove is arranged on the outer surface of the sand core far away from the cavity of the 3D printing sand core, the chilling block placing groove is communicated with the chilling block cavity, an anti-falling tool is fixedly arranged on one end face of the chilling block, the chilling block is embedded into the chilling block cavity through the chilling block placing groove, the end face of the chilling block far away from the anti-falling tool is flush with the wall of the sand core cavity of the 3D printing sand core, and the chilling block placing groove is filled and compacted by adopting chromite sand.
7. The method for setting the chilling block in the 3D printing sand core according to claim 6, wherein the length direction of the anti-falling tool is larger than the section length of the chilling block.
8. The method for setting the chilling blocks in the 3D printing sand core according to claim 7, wherein the anti-falling tool is made of square steel.
9. The method for setting the chilling block in the 3D printing sand core according to claim 6, wherein the chilling block is fixedly connected with the anti-falling tool in a welding mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010311073.8A CN111590029B (en) | 2020-04-22 | 2020-04-22 | Method for setting chilling blocks in 3D printing sand core |
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| CN202010311073.8A CN111590029B (en) | 2020-04-22 | 2020-04-22 | Method for setting chilling blocks in 3D printing sand core |
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| CN111590029B true CN111590029B (en) | 2022-05-13 |
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| CN115415484A (en) * | 2022-08-24 | 2022-12-02 | 四川共享铸造有限公司 | Core making method of sand core for casting |
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