CN117020124A - Core bar, sand core and sand casting method - Google Patents
Core bar, sand core and sand casting method Download PDFInfo
- Publication number
- CN117020124A CN117020124A CN202310824241.7A CN202310824241A CN117020124A CN 117020124 A CN117020124 A CN 117020124A CN 202310824241 A CN202310824241 A CN 202310824241A CN 117020124 A CN117020124 A CN 117020124A
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- core
- sand
- ceramic tube
- spring steel
- sand core
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007528 sand casting Methods 0.000 title claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 72
- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 52
- 238000005266 casting Methods 0.000 claims description 29
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 239000010431 corundum Substances 0.000 claims description 12
- 238000005495 investment casting Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 64
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000000463 material Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- B22C9/106—Vented or reinforced cores
-
- 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
- B22C9/103—Multipart cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the field of metallurgy, in particular to a core bar, a sand core and a sand casting method. A core bar comprising a ceramic tube and spring steel nested within the ceramic tube; along the axial direction of the ceramic tube, two ends of the spring steel respectively exceed two ends of the ceramic tube. Therefore, the core rod not only meets the high-strength requirement of the sand core and reduces the deformation rate of the core rod, but also can resist high temperature, and has high practicability in solving the problem of deformation of the sand core in the production of precision castings.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a core bar, a sand core and a sand casting method.
Background
Sand casting is a common casting process, and the produced sand cores are combined and then poured and cleaned to finally form the inner cavity form of the casting, so that the quality of the sand cores directly influences the quality of the casting. For the slender sand cores with L/D more than 15 and L more than 240mm, the slender sand cores are easy to deform or even break under the buoyancy action of high-temperature molten metal, so that castings are scrapped. Therefore, the sand core needs to have enough strength and rigidity to resist deformation, and when the raw materials cannot meet the strength guarantee, a core bar is usually placed inside the sand core during core making to improve the strength.
The core bar material is selected according to the size of the sand core, the large and medium core bars are made of cast steel, cast iron or profile steel, and the small and medium core bars are made of cast iron generally, and the thermal expansion coefficient of the core bar material is higher than that of the sand core. However, when the temperature of the molten metal exceeds 1400 ℃, the high temperature is conducted to the cast iron core bar, so that the strength is reduced, the deformation is started, the larger sand core has little influence on the core bar, the deformation amount of the sand core does not basically influence the size of a casting, but the wall thickness between the small sand core and the core bar is only 10-20mm, and the core bar is heated to generate larger deformation. For precision castings, the problem of blank size out-of-tolerance caused by deformation of iron core bones always exists, and how to prevent the deformation of an elongated sand core is a problem to be solved urgently.
For this purpose, the present invention is proposed.
Disclosure of Invention
The invention mainly aims to provide a core bar, a sand core and a sand casting method, so as to solve the problems that the traditional core bar is not high-temperature resistant and is easy to deform.
In order to achieve the above object, the present invention provides the following technical solutions.
A first aspect of the present invention provides a core comprising a ceramic tube and spring steel nested within the ceramic tube;
along the axial direction of the ceramic tube, two ends of the spring steel respectively exceed two ends of the ceramic tube.
Therefore, the core rod not only meets the high-strength requirement of the sand core and reduces the deformation rate of the core rod, but also can resist high temperature, and has high practicability in solving the problem of the deformation of the sand core in the production of precision castings, and the method is concretely as follows.
Alpha-alumina (alpha-Al) in ceramic tube 2 O 3 ) The alloy has high content, has the properties of quenching and quenching resistance and difficult cracking, has a thermal expansion coefficient close to 0, and has basically unchanged size at high temperature. Although the ceramic has good high temperature resistance, the ceramic has insufficient toughness, and the shrinkage force and mechanical stress of molten iron in the solidification process are extremely easy to break, so the ceramic is independentThe use of ceramic tubes as the core material is less practical. The spring steel has excellent comprehensive properties such as high strength, heat resistance, anti-spring reduction and the like, and the spring steel and the ceramic tube are mutually advantaged and evaded, so that the composite core bar formed by the spring steel and the ceramic tube is regular in structure and uniformly distributed on the section of the sand core, and meanwhile, the spring steel has enough strength and rigidity, so that the deformation condition of the sand core of a precision casting is reduced.
On this basis, the material type of the ceramic tube and the size difference, shape and the like between the ceramic tube and spring steel can be further controlled to improve the casting quality.
Further, the ceramic tube is a 95 corundum ceramic tube or a 99 corundum ceramic tube.
The heat-resistant temperature of the 95 corundum ceramic tube is close to 1300 ℃, the use temperature of the 99 corundum ceramic tube can reach 1750 ℃ at the highest, and the heat-resistant temperature of the 95 corundum ceramic tube are relatively high.
Further, a spacing between an inner wall of the ceramic tube and an outer wall of the spring steel is within 0.2 mm.
The distance value ensures that the spring steel can be inserted into the ceramic tube and simultaneously can limit the radial relative movement between the spring steel and the ceramic tube. The length of the spring steel extends to the position of the sand core head beyond the ceramic tube, deformation of the spring steel generated at high temperature freely extends towards two ends, so that the shape of the sand core is not affected when the spring steel is deformed axially, and part of heat can be transferred along the two ends of the spring steel.
Further, the interval between the inner wall of the ceramic tube and the outer wall of the spring steel is between 0.1mm and 0.2 mm. The effect of inhibiting deformation by adopting the interval is better.
Further, the ceramic tube is a circular tube, and the spring steel is a cylinder.
A second aspect of the present invention provides a sand core comprising:
the sand core body is provided with an inner cavity, and the core bar provided by the first aspect of the invention is arranged in the inner cavity;
the two core heads are respectively arranged at two opposite ends of the sand core body, and the two core heads are respectively connected with the two ends of the spring steel.
The invention selects the ceramic tube with the basic component of alumina as the main material of the core bar, and embeds the spring steel into the ceramic tube, thus the thermal expansion coefficient after combination is close to 0, the dimensional change is not generated in the molten iron at the temperature exceeding 1400 ℃ and the deformation of the sand core is controlled.
Further, the ratio of the length L of the sand core to the diameter D of the sand core is more than or equal to 15.
Such an elongated core has higher strength and deformation requirements and this problem can be solved with the core bars of the present invention.
Further, the length L of the sand core is more than or equal to 240mm.
Further, the two core heads are detachably connected with the two ends of the spring steel respectively.
The detachable connection is convenient for assembly and inspection and maintenance.
A third aspect of the invention provides a sand casting method comprising:
casting with the sand core provided in the second aspect of the invention.
The casting cast by the sand core provided by the invention has smaller deformation and higher quality.
In conclusion, compared with the prior art, the invention achieves the following technical effects:
(1) The core bar is made of a composite material, so that the high-strength requirement of the sand core is met, the deformation rate of the core bar is reduced, the high-temperature-resistant core bar is realized, and the high-strength-resistant core bar has high practicability in solving the problem of deformation of the sand core in the production of precision castings.
(2) The distance between the ceramic tube and the spring steel is controlled, so that the ceramic tube can be inserted into the ceramic tube, the radial relative movement between the ceramic tube and the spring steel is limited, the deformation force can be transferred to the two ends of the spring steel, and the deformation of the main body is reduced.
(3) The core bar is particularly suitable for slender sand cores, and cast castings are high in quality.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
FIG. 1 is a schematic view in partial perspective of a prior art sand core;
FIG. 2 is a schematic perspective view of a core bar provided by the present invention;
FIG. 3 is a radial schematic view of the core shown in FIG. 2;
fig. 4 is an axial cross-sectional schematic view of a sand core provided by the present invention.
Reference numerals:
11-core heads, 12-sand cores, 13-iron core bars, 21-spring steel, 22-ceramic tubes, 23-gaps, 3-sand core bodies and 4-core heads.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present invention, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
The prior technology for solving the deformation of the slender sand core in the precision casting mainly comprises two methods of arranging a core bar in the sand core and placing a core support.
As shown in figure 1, the built-in iron core bar 13 is placed in a die cavity of the sand core 12 before core making, the iron core bar is fixed by the core head 11, and the iron core bar is solidified at high temperature after sand injection by a core making machine, so that the strength of the sand core is improved in a mode that the iron core bar 13 is placed in the sand core 12, and weak parts of the sand core are not easy to break and crack under the buoyancy action of molten metal. The selection of the material and the size of the iron core bone is designed according to the size and the structure of the sand core, the temperature of molten metal, the casting mode and other aspects.
The placement of the chaplet is: the chaplet is an auxiliary tool used for supporting the easily deformable sand core and remaining in the casting after casting, the material is generally homogeneous or steel, and the surface is plated with chromium or zinc, so that the surface is ensured to be clean when the chaplet is used. The sand core deformation device is fixed between deformed sand cores, the caused sand core deformation under the buoyancy action of molten metal plays a supporting role, and the size and the structure of the core support can be flexibly selected according to the structure of the sand core, so that the deformation of the sand core is limited.
The manner of using the core internally-arranged core bars and placing the chaplet prevents the problem of deformation of the slender sand core to a certain extent, but has limitations, and the concrete steps are as follows.
The built-in core leg 13 has a higher thermal expansion coefficient than the core 12, about 1.2 x 10 -5 At the temperature of/DEG C, the sand core 12 is driven to deform at a high temperature, for precision castings with high precision, the dimensional change is required to be not more than 1mm, the deformation of the sand core 12 easily exceeds the allowable range of the precision castings, and the problem of sand core deformation of the precision castings cannot be effectively solved by the built-in iron core bars 13. The iron core 13 is deformed after use, and needs to be corrected for recycling, so that a certain amount of labor is increased, and time and labor are wasted.
The core support is difficult to master moderately, and too large not only wastes materials, but also directly causes poor fusion effect of the surface of the core support and the casting, or has local defects, and is not applicable to anti-leakage and pressure-bearing castings; too small may not provide sufficient strength to support the sand core or may not be melted in advance to provide support. For the slender sand core forming the hole and the shaft, the chaplet is manually placed for fixing, the contact area between the chaplet support and the sand core is small, the fixation is unstable, and the phenomenon that the chaplet cannot bear the impact of molten iron and is out of position exists during casting, so that the chaplet has a certain risk.
To this end, embodiments of the present invention provide a core bar, as shown in fig. 2-4, comprising a ceramic tube 22 and spring steel 21 nested within the ceramic tube 22; along the axial direction of the ceramic tube 22, the two ends of the spring steel 21 respectively exceed the two ends of the ceramic tube 22.
Therefore, the core rod not only meets the high-strength requirement of the sand core and reduces the deformation rate of the core rod, but also can resist high temperature, and has high practicability in solving the problem of the deformation of the sand core in the production of precision castings, and the method is concretely as follows.
Alpha-alumina (alpha-Al) in ceramic tube 22 2 O 3 ) The alloy has high content, has the properties of quenching and quenching resistance and difficult cracking, has a thermal expansion coefficient close to 0, and has basically unchanged size at high temperature. Although the ceramic has good high temperature resistance, the ceramic has insufficient toughness, and the shrinkage force and mechanical stress of molten iron in the solidification process are extremely easy to break, so the ceramic tube used alone has poor practicability as a core bar material. The spring steel 21 has excellent comprehensive properties such as high strength, heat resistance, anti-spring reduction and the like, and the spring steel and the ceramic tube 22 are mutually advantaged and evaded, so that a composite core bar formed by the spring steel and the ceramic tube is regular in structure and uniformly distributed on the section of the sand core, and meanwhile, the spring steel has enough strength and rigidity, so that the deformation condition of the sand core of a precision casting is reduced.
On this basis, the material type of the ceramic tube and the size difference, shape and the like between the ceramic tube and spring steel can be further controlled to improve the casting quality.
For example, in some embodiments, the ceramic tube may be a 95 corundum ceramic tube or a 99 corundum ceramic tube. The heat-resistant temperature of the 95 corundum ceramic tube is close to 1300 ℃, the use temperature of the 99 corundum ceramic tube can reach 1750 ℃ at the highest, and the heat-resistant temperature of the 95 corundum ceramic tube are relatively high.
In some embodiments, the spacing between the inner wall of the ceramic tube and the outer wall of the spring steel is within 0.2mm, i.e. the gap 23 in fig. 4 is controlled to be within 0.2 mm.
The distance value ensures that the spring steel 21 can be inserted into the ceramic tube 22 while satisfying a restriction on the relative radial movement between the two. The spring steel 21 extends beyond the ceramic tube 22 to the core end of the sand core, and deformation of the spring steel 21 generated at high temperature freely extends towards the two ends, so that the spring steel 21 does not influence the change of the shape of the sand core when being deformed axially, and meanwhile, a part of heat can be transferred along the two ends of the spring steel 21.
In order to make the effect of suppressing deformation better, in some embodiments, the interval between the inner wall of the ceramic tube 22 and the outer wall of the spring steel 21 is between 0.1mm and 0.2 mm. The shapes of the ceramic tube 22 and the spring steel 21 in the invention can be set arbitrarily, and in order to facilitate processing and stress uniformity of a workpiece, in some embodiments, the ceramic tube 22 is a circular tube, and the spring steel 21 is a cylinder.
The core bars are assembled into a sand core, and can be used for sand casting of castings. Specifically, the sand core includes: a core body 3 having an inner cavity provided with the core bar provided in fig. 2; the two core heads 4 are respectively arranged at two opposite ends of the sand core body 3, and the two core heads 4 are respectively connected with the two ends of the spring steel 21.
The sand core adopts a ceramic tube 22 with the basic component of aluminum oxide as a core bar main body material, spring steel 21 is embedded in the ceramic tube 22, and the thermal expansion coefficient of the combined sand core is close to 0 in the same principle as the previous principle, so that the size change in molten iron at the temperature exceeding 1400 ℃ is avoided, and the deformation of the sand core is controlled.
For an elongated core, the above benefits are more pronounced, for example, in some embodiments, the ratio of the length L of the core to its diameter D is ≡15.
Such an elongated core has higher strength and deformation requirements and this problem can be solved with the core bars of the present invention. On this basis, in some embodiments, the length L of the sand core is more than or equal to 240mm, and meets the requirements of a typical slender sand core.
In some embodiments, the two core pieces 4 are detachably connected to the two ends of the spring steel 21, respectively. The detachable connection is convenient for assembly and inspection and maintenance.
In some embodiments, the process for producing castings using the above-described sand cores comprises: and after the sand cores are combined, casting and cleaning are carried out, so that the inner cavity form of the casting is finally formed.
Wherein, the pouring is: and pouring the molten metal into a mould, and carrying out a casting forming process of the metal part.
The cleaning is as follows: and taking the casting out of the casting mould, removing the redundant part outside the body, and polishing and finishing the inner and outer surfaces of the casting.
For the same castings, after the sand core of the invention and the sand core shown in fig. 1 are respectively cast, the deformation of the castings obtained by the invention is within 1mm or even lower, and the deformation of the castings manufactured by the sand core shown in fig. 1 is 2 mm. In addition, after the spring steel is replaced by the ordinary carbon steel, the deformation of the manufactured casting is about 1.5 mm.
It can be seen that the composite core of the present combination has a lower deflection.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A core bar, characterized by comprising a ceramic tube and spring steel nested in the ceramic tube;
along the axial direction of the ceramic tube, two ends of the spring steel respectively exceed two ends of the ceramic tube.
2. A core according to claim 1, wherein the ceramic tube is a 95 corundum ceramic tube or a 99 corundum ceramic tube.
3. A core bar according to claim 1, wherein the spacing between the inner wall of the ceramic tube and the outer wall of the spring steel is within 0.2 mm.
4. A core bar according to claim 3, wherein the spacing between the inner wall of the ceramic tube and the outer wall of the spring steel is between 0.1mm and 0.2 mm.
5. A core bar according to any of claims 1-4, wherein the ceramic tube is a circular tube and the spring steel is a cylinder.
6. A sand core, characterized in that the sand core comprises:
a core body having an interior cavity within which is disposed the core bar of any one of claims 1-5;
the two core heads are respectively arranged at two opposite ends of the sand core body, and the two core heads are respectively connected with the two ends of the spring steel.
7. The sand core of claim 6 wherein the ratio of the length L of the sand core to the diameter D thereof is greater than or equal to 15.
8. The sand core of claim 7, wherein the length L of the sand core is greater than or equal to 240mm.
9. The sand core of claim 6 wherein two of said core ends are detachably connected to said two ends of said spring steel, respectively.
10. A sand casting method, characterized in that a casting is cast using the sand core according to any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310824241.7A CN117020124A (en) | 2023-07-06 | 2023-07-06 | Core bar, sand core and sand casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310824241.7A CN117020124A (en) | 2023-07-06 | 2023-07-06 | Core bar, sand core and sand casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117020124A true CN117020124A (en) | 2023-11-10 |
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ID=88632555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310824241.7A Pending CN117020124A (en) | 2023-07-06 | 2023-07-06 | Core bar, sand core and sand casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117020124A (en) |
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2023
- 2023-07-06 CN CN202310824241.7A patent/CN117020124A/en active Pending
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