CN210547878U - Large sand core structure - Google Patents
Large sand core structure Download PDFInfo
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- CN210547878U CN210547878U CN201920839252.1U CN201920839252U CN210547878U CN 210547878 U CN210547878 U CN 210547878U CN 201920839252 U CN201920839252 U CN 201920839252U CN 210547878 U CN210547878 U CN 210547878U
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Abstract
A large sand core skeleton structure comprises a sand core skeleton and a sand core body formed by coating and filling the sand core skeleton with molding sand; the sand core framework comprises a large-aperture supporting frame body and a small-aperture supporting frame body, the large-aperture supporting frame body and the small-aperture supporting frame body are in transition connection through a first supporting connecting rod, and the sand core is filled and coated on the inner periphery and the outer periphery of the large-aperture supporting frame body and the small-aperture supporting frame body to form a sand core body; the method has the advantages of firm structure, high strength, difficult occurrence of defects such as sand falling, slag inclusion, air holes and the like, smooth surface structure of the high-pressure cylinder of the obtained casting without casting defects and white spots, capability of meeting the use under high-pressure conditions and no oil seepage.
Description
Technical Field
The utility model relates to a gating system technical field, specificly relate to a large-scale (large casting, the size that the casting length and width is high like this application is at 3457mm x 2730mm x 795mm) psammitolite core bone structure.
Background
The specific structure of a large casting, such as a large cylinder casting with the length, width and height of 3457mm × 2730mm × 795mm, is shown in the attached figures 5-6: the oil cylinder casting comprises an oil cylinder casting body, wherein high-pressure cylinders are respectively arranged at four corners of the casting body, the weight of the whole casting reaches 22 tons, and as the use environment needs 21Mpa oil pressure resistance, 4 high-pressure cylinders cannot seep oil, and any casting defect causes oil seepage risk and influences the use effect of the casting; at present, a high-pressure cylinder part of a casting is formed through a sand core, but the traditional sand core is formed by directly adopting chromite sand through a bonding agent, the structure has insufficient structural strength in the pouring process, and the phenomena of sand falling of surface tissues and the like can occur in the molten iron pouring process, so that the defects of air holes, slag inclusion and the like of the surface tissues at the high-pressure cylinder are influenced, and the oil leakage phenomenon is caused; in addition, the chromite sand can cause the cooling speed of the casting at the high-pressure cylinder to be too high, so that white cast defects occur, and the using effect of the casting can be influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to the above-mentioned of prior art, provide a structure fastening, intensity are high, are difficult to appear falling defects such as sand, double-layered sediment, gas pocket, and the high-pressure cylinder surface texture of the foundry goods that obtains is level and smooth does not have casting defect and white mouth, can satisfy under the high pressure condition use, the large-scale psammitolite core bone structure of non-seepage oil.
In order to solve the technical problem, the utility model discloses a technical scheme as follows: a large sand core skeleton structure comprises a sand core skeleton and a sand core body formed by coating and filling the sand core skeleton with molding sand; the sand core framework comprises a large-aperture supporting framework body and a small-aperture supporting framework body, the large-aperture supporting framework body and the small-aperture supporting framework body are in transitional connection through a first supporting connecting rod, and the sand core is filled and coated on the inner periphery and the outer periphery of the large-aperture supporting framework body and the small-aperture supporting framework body to form the sand core body.
Adopt above-mentioned structure, set up in the original structure that is all the molding sand as supporting and consolidate, the psammitolite skeleton of reinforcing effect, can effectively guarantee the intensity of psammitolite like this, at the in-process that the die cavity was filled in the molten iron pouring, can not cause and fall sand, press from both sides the sediment and the venthole appears to guaranteed the smoothness ability of high-pressure cylinder department foundry goods surface texture, when making the high-pressure cylinder use under oil pressure 21Mpa, the oil seepage phenomenon still can not appear.
Preferably, the small-aperture support frame body and the large-aperture support frame body are radially connected with the first support connecting rod, and the first support connecting rod is positioned in the large-aperture support frame body and close to the end part; by adopting the structure, the whole supporting framework can better realize the molding and the supporting of the sand core.
Furthermore, the number of the first support connecting rods is 6, and the first support connecting rods are uniformly distributed along the circumferential direction of the small-aperture support frame body; adopt this structure can guarantee to be connected closely with large aperture supporting frame body, and the strength is balanced.
Preferably, one end of the large-aperture support frame body, which is far away from the first support connecting rod, is provided with a second support connecting rod in the radial direction; by adopting the structure, the radial deformation of the large-aperture supporting frame body is prevented, and the structure is firm.
Furthermore, the number of the second support connecting rods is two, and the two second support connecting rods are perpendicular to each other and coincide with the diameter of the large-aperture support frame body. Adopt this structure can effectual radial support large aperture braced frame body, prevent its deformation.
Preferably, the large-aperture supporting frame body and the small-aperture supporting frame body are provided with a plurality of through holes, the through holes can ensure that the molding sand is completely coated and filled in the large-aperture supporting frame body and the small-aperture supporting frame body to form the sand core body, and the through holes are arranged to ensure that the molding sand inside and outside the frame body realizes better adhesion, so that the strength of the whole sand core body is improved.
Preferably, the core body includes a large-aperture body portion and a small-aperture body portion each formed of a large-aperture support frame and a small-aperture support frame, the large-aperture body portion having a size of Φ 680 × 420mm (diameter and length), and the small-aperture body portion having a size of Φ 250 × 350mm (diameter and length). The dimensional structure can effectively realize the support of the high-pressure cylinder and the defect-free formation of surface tissues.
Furthermore, the molding sand coated and filled on the periphery of the outer side surface of the large-aperture supporting frame body is mixed molding sand formed by mixing 50% of chromite sand and 50% of common silica sand (weight ratio), and the molding sand filled in the inner hole of the large-aperture supporting frame body is the common silica sand; the inner side and the outer side of the small-aperture supporting frame body are coated and filled with common silica sand; the mixed molding sand abandons the traditional single chromite sand, so that the molten iron cooling speed is moderate, the phenomenon of white cast can not occur, the oil impermeability of the high-pressure cylinder is ensured, the usage of the chromite sand is reduced, and the production cost is reduced.
Furthermore, the thickness of the molding sand which is coated and filled on the periphery of the outer side surface of the large-aperture supporting frame body is 60-80 mm. By adopting the structure, the casting defect of the inner surface of the high-pressure cylinder can be effectively prevented, and the cost can be reduced. And set up this braced frame of large aperture and can part two kinds of sand moulds, play good casting effect separately.
Drawings
Fig. 1 is a schematic view of a sand core skeleton structure in a large sand core skeleton structure according to the present application (a small aperture support frame body shows an end direction).
Fig. 2 is a schematic view of a sand core skeleton structure in the large sand core skeleton structure of the present application (large aperture support frame body shows end directions).
FIG. 3 is a schematic diagram of a side view of a sand core skeleton in a large sand core skeleton structure according to the present application.
Fig. 4 is a schematic diagram of a side view structure of a sand core body in a large sand core skeleton structure according to the present application.
Fig. 5 is a schematic structural view of a large-sized cylinder casting of the present invention (four high-pressure cylinders are visible from the front).
Fig. 6 is a schematic structural view of a large-sized cylinder casting of the present invention (four high-pressure cylinders are visible from the back).
As shown in the attached drawings: 1. the sand core comprises a sand core framework, a large-aperture supporting frame body 1.1, a small-aperture supporting frame body 1.2, a first supporting connecting rod 1.3, a second supporting connecting rod 1.4, a sand core body 2, a through hole 3, an oil cylinder casting body 4 and a high-pressure cylinder 5.
Detailed Description
The present application will be described in further detail with reference to the following drawings and specific examples, but the present application is not limited to the following examples. The casting cavity is a space for forming the casting, the structure of the casting cavity is completely matched with the casting, and the casting cavity can be understood as each position of the casting.
As shown in the attached drawings 1-4, the large sand core framework structure comprises a sand core framework 1 and a sand core body 2 formed by coating and filling sand into the sand core framework; the sand core framework comprises a large-aperture supporting framework body 1.1 and a small-aperture supporting framework body 1.2, the large-aperture supporting framework body and the small-aperture supporting framework body are in transition connection through a first supporting connecting rod 1.3, and the sand core is filled and coated on the inner periphery and the outer periphery of the large-aperture supporting framework body and the small-aperture supporting framework body to form a sand core body 2. The core rod of the large sand core in the embodiment is applied to a large oil cylinder casting as shown in fig. 5-6, the casting comprises an oil cylinder casting body 4, high-pressure cylinders 5 are respectively arranged at four corners of the body, the size of the whole casting is 3457mm multiplied by 2730mm multiplied by 795mm, the weight of the whole casting reaches 22 tons, and the high-pressure cylinders need to resist 21Mpa of oil pressure.
Adopt above-mentioned structure, set up in the original structure that is all the molding sand as supporting and consolidate, the psammitolite skeleton of reinforcing effect, can effectively guarantee the intensity of psammitolite like this, at the in-process that the die cavity was filled in the molten iron pouring, can not cause and fall sand, press from both sides the sediment and the venthole appears to guaranteed the smoothness ability of high-pressure cylinder department foundry goods surface texture, when making the high-pressure cylinder use under oil pressure 21Mpa, the oil seepage phenomenon still can not appear.
As shown in figures 1-2: the small-aperture supporting frame body 1.2 and the large-aperture supporting frame body 1.1 are radially connected with a first supporting connecting rod 1.3, and the first supporting connecting rod is positioned in the large-aperture supporting frame body and close to the end part; by adopting the structure, the whole supporting framework can better realize the molding and supporting of the sand core; the small-aperture holding frame 1.2 and the large-aperture holding frame 1.1 shown in this example are both hollow cylindrical.
As shown in fig. 1-2, the first support connecting rods 1.3 of this embodiment are arranged in 6 pieces, and are uniformly arranged along the circumferential direction of the small-aperture support frame (i.e., one end of each of the 6 pieces of first support connecting rods is inserted into the small-aperture support frame, the other end is inserted into the large-aperture support frame, and the extending direction of the first support connecting rods is radial extension); adopt this structure can guarantee to be connected closely with large aperture supporting frame body, and the strength is balanced.
As shown in fig. 2, a second support link 1.4 is radially arranged at one end of the large-aperture support frame 1.1 far away from the first support link 1.3; by adopting the structure, the large-aperture supporting frame body is prevented from deforming in a radial mode, and the structure is firm; further, two second support connecting rods 1.4 are arranged, and the two second support connecting rods are perpendicular to each other and coincide with the diameter of the large-aperture support frame body (specifically, one end of each second support connecting rod close to the large-aperture support frame body is radially arranged along the diameter direction and is inserted into the frame body, and the other end of each second support connecting rod is perpendicular to the first support connecting rod, is also arranged below the first support connecting rod in the pickling diameter direction, is in a cross-shaped support structure and supports the large-aperture support frame body). Adopt this structure can effectual radial support large aperture braced frame body, prevent its deformation.
As shown in fig. 1-3, the large-aperture supporting frame body and the small-aperture supporting frame body are provided with a plurality of through holes 3, the through holes can ensure that the molding sand is completely coated and filled in the large-aperture supporting frame body and the small-aperture supporting frame body to form the sand core body, and the through holes are arranged to ensure that the molding sand inside and outside the frame body can be better adhered, so that the strength of the whole sand core body is improved.
As shown in fig. 4: the sand core body 2 comprises a large-aperture body part 2.1 and a small-aperture body part 2.2 through a large-aperture support frame body and a small-aperture support frame body, wherein the large-aperture body part is phi 680 multiplied by 420mm (diameter and length), and the small-aperture body part is phi 250 multiplied by 350mm (diameter and length). The dimensional structure can effectively realize the support of the high-pressure cylinder and the defect-free formation of surface tissues.
The molding sand coated and filled on the periphery of the outer side surface of the large-aperture supporting frame body is mixed molding sand formed by mixing 50% of chromite sand and 50% of common silica sand (weight ratio), and the molding sand filled in the inner hole of the large-aperture supporting frame body is the common silica sand; the inner side and the outer side of the small-aperture supporting frame body are coated and filled with common silica sand; the mixed molding sand abandons the traditional single chromite sand, so that the molten iron cooling speed is moderate, the phenomenon of white cast can not occur, the oil impermeability of the high-pressure cylinder is ensured, the usage of the chromite sand is reduced, and the production cost is reduced. Furthermore, the thickness of the molding sand which is coated and filled on the periphery of the outer side surface of the large-aperture supporting frame body is 60-80 mm. By adopting the structure, the casting defect of the inner surface of the high-pressure cylinder can be effectively prevented, and the cost can be reduced. And set up large aperture braced frame and can part two kinds of sand moulds, play good casting effect separately.
The material for filling the inner and outer peripheries of the sand core framework to form the sand core body is added with materials such as proper molding sand binders besides molding sand, and the materials are materials commonly used for preparing sand cores or casting sand boxes in the industry, namely, the materials comprise casting sand (molding sand), molding sand binders and the like; preferably, the molding sand is formed by mixing 50% of chromite sand and 50% of ordinary silica sand.
The psammitolite skeleton in this utility adopts ordinary steel preparation can satisfy the requirement, as long as can play the support and keep apart other materials homoenergetic of molding sand and all can be applied to this application. The utility model discloses regard as inside reinforcing, bearing structure with the psammitolite skeleton, then fill cladding molding sand and constitute complete psammitolite core bone structure. The core frame structure of the large sand core is a core which is specifically applied to a high-pressure cylinder part of a corresponding cavity of a large oil cylinder casting pouring system shown in the attached figures 5-6, namely a sand core body.
Claims (9)
1. The utility model provides a large-scale psammitolite core bone structure which characterized in that: the sand core comprises a sand core framework and a sand core body formed by coating and filling the sand core framework with molding sand; the sand core framework comprises a large-aperture supporting framework body and a small-aperture supporting framework body, the large-aperture supporting framework body and the small-aperture supporting framework body are in transitional connection through a first supporting connecting rod, and the sand core is filled and coated on the inner periphery and the outer periphery of the large-aperture supporting framework body and the small-aperture supporting framework body to form the sand core body.
2. The large sand core arbor structure of claim 1, wherein: the small-aperture support frame body and the large-aperture support frame body are radially connected with the first support connecting rod, and the first support connecting rod is located in the large-aperture support frame body and close to the end portion.
3. The large sand core arbor structure of claim 2, wherein: the number of the first supporting connecting rods is 6, and the first supporting connecting rods are uniformly distributed along the circumferential direction of the small-aperture supporting frame body.
4. The large sand core arbor structure of claim 1, wherein: and a second support connecting rod is radially arranged at one end of the large-aperture support frame body, which is far away from the first support connecting rod.
5. The large sand core arbor structure of claim 4, wherein: the number of the second support connecting rods is two, and the two second support connecting rods are perpendicular to each other and coincide with the diameter of the large-aperture support frame body.
6. The large sand core arbor structure of claim 1, wherein: the large-aperture supporting frame body and the small-aperture supporting frame body are provided with a plurality of through holes.
7. The large sand core arbor structure of claim 1, wherein: the sand core body forms a large-aperture body part and a small-aperture body part through a large-aperture supporting frame body and a small-aperture supporting frame body, the size of the large-aperture body part is phi 680 multiplied by 420mm, and the size of the small-aperture body part is phi 250 multiplied by 350 mm.
8. The large sand core arbor structure of claim 7, wherein: the molding sand coated and filled on the periphery of the outer side surface of the large-aperture supporting frame body is mixed molding sand formed by mixing 50% of chromite sand and 50% of common silica sand, and the molding sand filled in the inner hole of the large-aperture supporting frame body is the common silica sand; the inner side and the outer side of the small-aperture supporting frame body are coated and filled with common silica sand.
9. The large sand core arbor structure of claim 8, wherein: the thickness of the molding sand which is coated and filled at the periphery of the outer side surface of the large-aperture supporting frame body is 60-80 mm.
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| CN201920839252.1U CN210547878U (en) | 2019-06-05 | 2019-06-05 | Large sand core structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115007800A (en) * | 2022-05-12 | 2022-09-06 | 大连华锐重工铸业有限公司 | Universal core bar hoisting device for large castings and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115007800A (en) * | 2022-05-12 | 2022-09-06 | 大连华锐重工铸业有限公司 | Universal core bar hoisting device for large castings and use method thereof |
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