CN112496264B - Preparation method of resin sand casting without shock channel defect - Google Patents
Preparation method of resin sand casting without shock channel defect Download PDFInfo
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- CN112496264B CN112496264B CN202011382026.9A CN202011382026A CN112496264B CN 112496264 B CN112496264 B CN 112496264B CN 202011382026 A CN202011382026 A CN 202011382026A CN 112496264 B CN112496264 B CN 112496264B
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- groove
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- excitation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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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
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
Abstract
The application discloses a preparation method of a resin sand casting without shock channel defects, which comprises the following steps: arranging an anti-shock groove patching part at the joint of a thin wall and a thick wall in a metal core box, and preparing a sand core with an anti-shock groove according to the metal core box, wherein the joint of the thin wall and the thick wall comprises a boss, a window and an end frame, and the anti-shock groove is used for patching a casting to offset the shock groove defect; and pouring liquid metal into the casting mold consisting of the sand cores, opening the box and shakeout after the metal is solidified to obtain an initial casting, and polishing the initial casting to remove the anti-shock ditch subsidy to obtain the resin sand casting. The technical problem of can not effectively prevent among the prior art that the ditch defect is swashed to resin sand foundry goods has been solved in this application.
Description
Technical Field
The application relates to the technical field of casting of non-ferrous metal alloys, in particular to a preparation method of a resin sand casting without shock channel defects.
Background
The gouging defect is a surface quality defect commonly found in castings produced by a self-hardening resin sand (including sand/core casting processes using molds or 3D printing), and is often in the shape of a striated depression, often in the shape of a groove, also known as a gouge or groove mark, and is similar in shape to a rat tail defect in a green sand (clay sand) casting process or an investment casting process. The shock channel defect and the rat tail defect belong to swelling defects, but the generation mechanisms are different, wherein the rat tail defect is usually generated in a green sand casting, the mechanical essence is that a dry sand layer is pressed to generate shear slip, and the large plane part of the casting is easy to generate; the grooves are usually formed at the connecting parts of the end frames, bosses or ribs of the resin sand casting and the thin-wall area, and the mechanical essence is that the chilling blocks at the end frames, the bosses or the windows are heated and expanded when the alloy is poured, sand molds at adjacent parts are extruded into the casting, or groove marks are formed by cracking of the sand molds due to large temperature difference of the sand molds at the connecting parts of the thin walls.
At present, for the rat tail defect, the generation of the defect is effectively prevented by improving the heat strength of a sand mold. However, this method is not suitable for the striae generated from the hard resin sand casting, and no prevention method for the striae defect of the resin sand casting has been found in the published report. Therefore, how to effectively prevent the channel-exciting defect of the resin sand casting becomes a problem to be solved urgently.
Disclosure of Invention
The technical problem that this application was solved is: the application provides a preparation method of a resin sand casting without the shock groove defect, aiming at the problem that the shock groove defect of the resin sand casting cannot be effectively prevented in the prior art. In the scheme that this application embodiment provided, through preventing exciting ditch subsidy portion at the setting of metal core box to be used for carrying out the subsidy in order to offset exciting ditch defect to the foundry goods through preventing exciting the slot, and polish after preparing out initial foundry goods and get rid of prevent exciting ditch subsidy portion and obtain the resin sand foundry goods that does not have exciting ditch defect, avoid can effectively preventing and then influencing the quality of resin sand foundry goods to exciting ditch defect at resin sand foundry goods preparation in-process.
In a first aspect, an embodiment of the present application provides a method for preparing a resin sand casting without an exciting channel defect, where the method includes:
arranging an anti-shock groove patching part at the joint of a thin wall and a thick wall in a metal core box, and preparing a sand core with an anti-shock groove according to the metal core box, wherein the joint of the thin wall and the thick wall comprises a boss, a window or an end frame, and the anti-shock groove is used for patching a casting to offset the shock groove defect;
and pouring liquid metal into a casting mold consisting of the sand cores, opening the mold and shakeout after the metal is solidified to obtain an initial casting, and polishing the initial casting to remove the anti-shock groove patch to obtain the resin sand casting.
In the scheme that this application embodiment provided, through preventing exciting ditch subsidy portion at the setting of metal core box to be used for carrying out the subsidy in order to offset exciting ditch defect to the foundry goods through preventing exciting the slot, and polish after preparing out initial foundry goods and get rid of prevent exciting ditch subsidy portion and obtain the resin sand foundry goods that does not have exciting ditch defect, avoid can effectively preventing and then influencing the quality of resin foundry goods to exciting ditch defect at resin sand foundry goods preparation in-process.
Optionally, the shape of the anti-shock groove is the same as the shape of the joint of the end frame, the boss or the window region and the thin-wall region.
Optionally, the size of the anti-excitation groove is 8 mm-15 mm in groove width and 1 mm-5 mm in depth.
Optionally, if the anti-shock groove is used for counteracting the shock groove defect at the side connection part of the window area and the thin-wall area, the anti-shock groove is arranged at the connection part of the chill and the metal core box, the anti-shock groove is longitudinally arranged, the groove width is 8mm, and the depth is 2mm.
Optionally, if the anti-excitation groove is used for offsetting the channel excitation defect at the joint of the window area and the lower surface of the thin-wall area, the anti-excitation groove is arranged at the joint of the window area and the thin-wall area, the anti-excitation groove is transversely arranged, the groove width is 10 mm-15 mm, and the depth is 1mm.
Optionally, if the anti-shock groove is used for offsetting the shock groove defect at the joint of the boss and the thin-wall area, the height of the chilling block is thinned by 5-8 mm, and the anti-shock groove is arranged above the chilling block and has a groove depth of 3-5 mm.
Optionally, if the anti-excitation groove is used for counteracting the channel excitation defect at the joint of the end frame and the thin-wall area, the anti-excitation groove is arranged at the joint of the lower edge of the end frame and the thin-wall area, the groove width is 8 mm-10 mm, and the depth is 1 mm-2 mm.
Optionally, if the anti-shock groove is used for offsetting shock groove defects of the chill profiling part on the outer surface of the casting, the anti-shock groove is arranged on the upper edge and the lower edge of the chill, the cross section of the anti-shock groove is an isosceles triangle, and the length of the isosceles side is 5mm.
Optionally, the anti-shock groove is arranged on the sand core in a mould patching or sand mould 3D printing mode.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing a resin sand casting without shock channel defects according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a semi-metal core box according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating the positional relationship among a metal core box, an anti-shock groove, a chiller and a sand core provided in the embodiment of the present application;
FIG. 4 is a schematic diagram illustrating the positional relationship among a metal core box, an anti-shock groove, a chiller and a sand core provided in the embodiment of the present application;
FIG. 5 is a schematic diagram illustrating the positional relationship among a metal core box, an anti-shock groove, a chiller and a sand core provided in the embodiment of the present application;
FIG. 6 is a schematic diagram illustrating the positional relationship among a metal core box, an anti-shock groove, a chiller and a sand core provided in the embodiment of the present application;
fig. 7 is a schematic diagram of a positional relationship among a metal core box, an anti-shock groove, a chiller and a sand core provided in an embodiment of the present application.
Detailed Description
In the solutions provided in the embodiments of the present application, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The method for preparing the resin sand casting without the shock channel defect provided by the embodiment of the application is further described in detail with reference to the attached drawings in the specification, and the specific implementation manner of the method can comprise the following steps (the flow of the method is shown in fig. 1):
101, arranging an anti-groove patching part at the joint of a thin wall and a thick wall in a metal core box, and preparing a sand core with an anti-groove according to the metal core box, wherein the joint of the thin wall and the thick wall comprises a boss, a window or an end frame, and the anti-groove is used for patching a casting to offset the defect of the groove.
Specifically, refer to fig. 2, which is a schematic structural diagram of a semi-metal core box provided in the embodiments of the present application. In the structure shown in fig. 2, the interior of the metal core box is a cavity structure, and the metal core box includes thin and thick wall joints such as an end frame, a boss, a window area, and the like, wherein the thin and thick wall joints refer to a connection area with a variable thickness.
It will be appreciated that in the actual core making process, two half metal core boxes are brought together to make a complete core.
In order to facilitate understanding of the principle of the anti-shock groove for supplementing the casting to counteract the shock groove defect, the following briefly introduces the principle of the shock groove defect generated in the preparation of the resin sand casting.
In the preparation process of the resin sand casting, the chill is attached to the inner wall of a metal core box, then the molding sand is injected into the metal core box, then the molding sand is solidified and formed to obtain the sand core, wherein the shape of the outer surface of the sand core is matched with the inner structure of the metal core box, then the metal liquid is poured outside the sand core and solidified to enable a metal layer with a certain thickness to be attached to the outer part of the sand core, and then the metal layer is separated from the sand core to obtain the casting, wherein the inner shape of the casting is the same as the inner shape of the metal core box.
However, in the preparation process of the resin sand casting, the chill expands when heated and extrudes the molding sand injected into the metal core box, so that part of the exterior of the formed sand core is protruded due to extrusion, or the sand mold at the high-temperature part is expanded and cracked due to the larger temperature difference of the sand mold at the joint of the thin and thick walls, then when molten metal is poured into a cavity formed by the sand core and solidified to attach a metal layer with a certain thickness to the exterior of the sand core, the metal layer is attached to the part, which is protruded or cracked due to extrusion, on the surface of the sand core to form a recess, and then the inner surface of the prepared casting has a groove-exciting defect.
Further, the principle of the anti-shock groove for counteracting the shock groove defect at the joint of the thin wall and the thick wall is briefly introduced.
The anti-groove-exciting patching part is arranged at a part which is easy to extrude a sand mold or crack the sand mold to cause groove exciting defects in the metal core box, wherein the part which is easy to cause the groove exciting defects on the metal core box is various, such as the joints of thin and thick walls of an upper end frame, a boss or a window area of the metal core box. Therefore, in the solution provided in the embodiment of the present application, the shock-proof groove is provided at various positions.
Further, in the solution provided in the embodiment of the present application, the shape of the anti-shock groove may be configured according to the type. In a possible implementation manner, the shape of the excitation-prevention groove is the same as the shape of the junction of the end frame, the boss or the window region and the thin-wall region.
Further, since there are a plurality of positions for disposing the anti-shock groove, the anti-shock grooves disposed at different positions have different sizes in addition to different shapes.
In a possible realization mode, the size of the shock-proof groove is 8 mm-15 mm of groove width and 1 mm-5 mm of depth.
Further, referring to fig. 3, in a possible implementation manner, if the anti-shock groove is used to offset the shock groove defect at the joint of the window area and the side surface of the thin-wall area, the anti-shock groove is disposed at the joint of the chill and the metal core box, and the anti-shock groove is longitudinally disposed, has a groove width of 8mm, and has a depth of 2mm.
Further, referring to fig. 4, in a possible implementation manner, if the anti-shock groove is used to counteract a shock groove defect at a joint of the lower surface of the window area and the thin-wall area, the anti-shock groove is disposed at the joint of the window area and the thin-wall area, the anti-shock groove is transversely disposed, has a groove width of 10mm to 15mm, and has a depth of 1mm.
Further, referring to fig. 5, in a possible implementation manner, if the shock-proof groove is used for counteracting the shock groove defect at the joint of the boss and the thin-wall area, the height of the chill is thinned by 5mm to 8mm, and the shock-proof groove is arranged above the chill and has a groove depth of 3mm to 5mm.
Further, referring to fig. 6, in a possible implementation manner, if the anti-laser groove is used to counteract the laser groove defect at the joint of the end frame and the thin-walled region, the anti-laser groove is disposed at the joint of the lower edge of the end frame and the thin-walled region, and has a groove width of 8mm to 10mm and a depth of 1mm to 2mm.
Further, referring to fig. 7, in a possible implementation manner, if the anti-shock groove is used for counteracting the shock groove defect of the chill profiling part on the outer surface of the casting, the anti-shock groove is arranged on the upper edge and the lower edge of the chill, the cross section of the anti-shock groove is an isosceles triangle, and the length of the isosceles side is 5mm.
Further, in a possible implementation manner, the anti-shock groove is arranged on the sand core in a mold patching or sand mold 3D printing manner.
Specifically, in the scheme provided in the embodiment of the present application, there are various ways of disposing the anti-shock groove on the metal core box or the chill, and if a mold (including but not limited to a wood mold or a metal mold) is used for making a sand mold/core, a corresponding mold or core box portion is subjected to patching, so that the anti-shock groove is formed in a shape; if a sand mold/core is manufactured by adopting a sand mold 3D printing method, the anti-shock groove is made in the printed three-dimensional model, and the anti-shock groove is directly printed and formed; if structural factors are considered, the anti-excitation grooves cannot be formed in the die or the three-dimensional model, and after the sand mold/core is manufactured, the anti-excitation grooves are formed manually, so that the same effect is achieved.
102, pouring liquid metal into a casting mold consisting of the sand cores, opening the mold and shakeout after the metal is solidified to obtain an initial casting, and polishing the initial casting to remove the anti-shock groove patch to obtain a resin sand casting.
Specifically, in the scheme provided by the embodiment of the application, before metal is poured and cured outside the sand core, the sand core is uniformly coated twice during coating, the shock-proof groove part is polished and smoothed, subsequent casting can be performed, after an initial casting is obtained through subsequent manufacturing, a subsequent cleaning link is performed on the initial casting, the shock-proof groove supplementary paste is polished and removed, and smooth transition treatment is performed, so that the resin sand casting without shock groove defects can be obtained.
In the scheme that this application embodiment provided, through preventing exciting ditch subsidy portion at the setting of metal core box to be used for carrying out the subsidy in order to offset exciting ditch defect to the foundry goods through preventing exciting the slot, and polish after preparing out initial foundry goods and get rid of prevent exciting ditch subsidy portion and obtain the resin sand foundry goods that does not have exciting ditch defect, avoid can effectively preventing and then influencing the quality of resin foundry goods to exciting ditch defect at resin sand foundry goods preparation in-process.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (1)
1. A preparation method of a resin sand casting without shock channel defects is characterized by comprising the following steps:
arranging an anti-excitation groove subsiding part at the joint of a thin wall and a thick wall in a metal core box, and preparing the sand core with the anti-excitation groove according to the metal core box, wherein the joint of the thin wall and the thick wall comprises a boss, a window or an end frame, and the anti-excitation groove is used for subsiding a casting to offset the defect of the excitation groove;
pouring liquid metal into a casting mold consisting of the sand cores, opening the mold and shakeout after the metal is solidified to obtain an initial casting, and polishing the initial casting to remove the anti-shock ditch subsidy to obtain a resin sand casting;
the anti-shock groove is arranged on the sand core in a mould patching or sand mould 3D printing mode; if a mould is adopted for manufacturing the sand mould/core, patching is carried out on the corresponding mould or core box part, and the shape of the anti-excitation groove is made; if a sand mold/core is manufactured by adopting a sand mold 3D printing method, the anti-shock groove is made in the printed three-dimensional model, and the anti-shock groove is directly printed and formed; if structural factors are considered, the anti-excitation groove cannot be formed in the die or the three-dimensional model, and after the sand mold/core is manufactured, the anti-excitation groove is formed manually;
the anti-channeling patching part is arranged at a part which is easy to extrude a sand mold or crack the sand mold to cause channeling defects in the metal core box, wherein the part which generates the channeling defects on the metal core box comprises the joint of a thin and thick wall of an upper end frame, a boss or a window area of the metal core box;
the shape of the anti-excitation groove is the same as that of the connecting part of the end frame, the boss or the window area and the thin-wall area;
the anti-excitation grooves arranged at different positions are different in shape and size;
the size of the anti-shock groove is 8 mm-15 mm in groove width and 1 mm-5 mm in depth;
if the anti-shock groove is used for counteracting the shock groove defect at the side surface connecting part of the window area and the thin-wall area, the anti-shock groove is arranged at the connecting part of the chilling block and the metal core box, and is longitudinally arranged, 8mm in groove width and 2mm in depth;
if the anti-excitation groove is used for counteracting the channel excitation defect at the joint of the window area and the lower surface of the thin-wall area, the anti-excitation groove is arranged at the joint of the window area and the thin-wall area, the anti-excitation groove is transversely arranged, the groove width is 10-15 mm, and the depth is 1mm;
if the anti-shock groove is used for counteracting the shock groove defect at the joint of the boss and the thin-wall area, the height of the chilling block is thinned by 5-8 mm, and the anti-shock groove is arranged above the chilling block and has the groove depth of 3-5 mm;
if the anti-excitation groove is used for counteracting the channel excitation defect at the joint of the end frame and the thin-wall area, the anti-excitation groove is arranged at the joint of the lower edge of the end frame and the thin-wall area, the groove width is 8-10 mm, and the depth is 1-2 mm;
if the anti-shock groove is used for offsetting shock groove defects of the chill profiling part on the outer surface of the casting, the anti-shock groove is arranged on the upper edge and the lower edge of the chill, the section of the anti-shock groove is an isosceles triangle, and the length of the isosceles side is 5mm;
before metal is poured and solidified outside the sand core, the sand core is uniformly coated twice when coating, the shock-proof groove part is polished and polished smoothly, subsequent casting can be carried out, after an initial casting is obtained through subsequent manufacturing, a subsequent cleaning link is carried out on the initial casting, the shock-proof groove supplementary paste is polished and removed, and smooth transition treatment is carried out, so that the resin sand casting without shock groove defects can be obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011382026.9A CN112496264B (en) | 2020-11-30 | 2020-11-30 | Preparation method of resin sand casting without shock channel defect |
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| CN202011382026.9A CN112496264B (en) | 2020-11-30 | 2020-11-30 | Preparation method of resin sand casting without shock channel defect |
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| CN112496264A CN112496264A (en) | 2021-03-16 |
| CN112496264B true CN112496264B (en) | 2023-01-10 |
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| CN105215271B (en) * | 2015-10-29 | 2017-09-22 | 共享铸钢有限公司 | The cored-up mould sand mould structure and cored-up mould method of a kind of gear box casing casting |
| CN108380839B (en) * | 2018-01-20 | 2020-01-24 | 共享铸钢有限公司 | Anti-cracking casting method for thin and thick wall transition area of steel casting |
| CN110090916A (en) * | 2018-01-31 | 2019-08-06 | 中国科学院金属研究所 | The control method of surface defect during one seed nucleus main pump shell cast |
| CN109175327B (en) * | 2018-10-25 | 2020-12-04 | 北京航星机器制造有限公司 | Cleaning method for semi-closed complex inner cavity casting |
| CN110952009A (en) * | 2019-12-18 | 2020-04-03 | 西安西工大超晶科技发展有限责任公司 | Preparation method of alloy casting |
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