CN105170911B - A kind of complicated abnormal shape is combined the manufacture method of core - Google Patents
A kind of complicated abnormal shape is combined the manufacture method of core Download PDFInfo
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- CN105170911B CN105170911B CN201510548867.5A CN201510548867A CN105170911B CN 105170911 B CN105170911 B CN 105170911B CN 201510548867 A CN201510548867 A CN 201510548867A CN 105170911 B CN105170911 B CN 105170911B
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Abstract
The invention discloses the manufacture method that a kind of complicated abnormal shape is combined core, belong to the manufacture method technical field of sand core for casting.This method using furans and/or send the thickness of general resin filling mold cavity big and easily fills position first, and for weak part in sand core structure and is difficult to be molded position and temporarily reserves, and assembles after metal pattern, from sand inlet using overlay film sandfilling reserved area；Metal die is heated again, makes core hardened forming；Compound core is taken out after die sinking.The performance characteristics such as mobility, gas-forming property, deformability and the intensity of variety classes mixed sand are taken full advantage of using the inventive method, the different in nature core of complex-shaped thin and thick handing-over can be produced, with the thick big position gas forming amount of core is small, deformability is good, defeated and dispersed cleaning easily and moderate strength, and the filling of core thin-walled position is complete, intensity is higher meets use requirement.
Description
Technical field
The present invention relates to the manufacture method technical field of sand core for casting, and in particular to a kind of complicated abnormal shape is combined core
Manufacture method.
Background technology
Some complex aluminiums, the Mg alloy castings in the fields such as current Aeronautics and Astronautics, different complex-shaped surface mould is contained in inside
Structure, there is the narrow cavity configurations such as elongate curved oil pipe shape, three dimendional blade shape, also there is barrel-shaped, the annular big cavity configuration of uniform thickness, also becomes and cuts
The Complex Different Shape structures such as face, thin and thick handing-over.It is generally then defeated and dispersed using core casting for the shaping of cast-internal cavity structure
The method of core.Core shaping mainly has precoated sand, furan resin-sand, sends the methods such as general resin sand.
Furan resin-sand sends general resin sand coremaking, and sand core strength is moderate, and core gas forming amount and deformability are preferably, main to use
In thick big core, and for containing the narrow thin class core such as elongated oil circuit, three dimendional blade, using furan resin-sand or general resin is sent
Sand then can not coremaking shaping, be on the one hand due to that mobility is relatively poor, be not enough to filling molding, be on the other hand due to intensity
Not enough, it is impossible to meet use requirement.
For the preparation method containing the narrow thin class core such as elongated oil circuit, three dimendional blade, presently mainly using precoated sand
Intensity is higher after shaping, because precoated sand has good mobility, it is easy to fill mold cavity, and shaping, can
Meet the intensity requirement that core is used.But, in production practices, using film covered sand core, still suffer from following defect：(1) overlay film
Resin content is higher in sand, in casting process, is contacted with high temperature fluent metal, can produce a large amount of gases, and core portion big absolutely
Point wrapped up by liquid metal, a large amount of gases of generation enter liquid metal, cause casting to choke fiery defect, frequently can lead to casting
Scrap；(2) film covered sand core has the advantages that intensity is high, but also brings that core deformability is poor, the defeated and dispersed cleaning of core is difficult simultaneously
Etc. defect, particularly with region thicker in core, because deformability difference easily cracks defect in casting solidification process, and
And film covered sand core is not defeated and dispersed after moulding by casting and intensity is still very high, clear up very difficult；(3) join for variable cross-section, thin and thick
Complex Different Shape core, manufactured using precoated sand, in addition to drawbacks described above, there is a problem in that：One is that precoated sand heating is hard
During change, the temperature heat because core is thin, needed for thick position is inconsistent, causes core thin-walled position easily to be burnt crisp and thick big
Sclerosis is insufficient；Two be thin, thick position expanded by heating and metal die expanded by heating situation it is inconsistent, cause take out
Core is difficult, and is easy to be broken core.
The content of the invention
In order to overcome the above mentioned problem that current sand core for casting is present, it is an object of the invention to provide a kind of complicated abnormal shape
The manufacture method of compound core, this method takes full advantage of mobility, gas-forming property, deformability and the intensity of variety classes mixed sand
Etc. performance characteristics, the complicated abnormal shape core of complex-shaped thin and thick handing-over can be produced, with the thick big position gas forming amount of core it is small,
Deformability is good, defeated and dispersed cleaning easily and moderate strength, and the filling of core thin-walled position is complete, intensity is higher meets using will
Ask.The core that the inventive method can obtain furans or send general mixed with resin sand not to be molded, while such a different in nature core is than complete
The full core gas forming amount manufactured using precoated sand is lower, deformability is more preferable, core is defeated and dispersed is easier and core shaping qualification rate
Height, in addition, the different in nature core core-making method manufacture of the complexity of the present invention is an integral sand core, combines what is formed than polylith core
Core dimensional accuracy is higher.
To achieve the above object, the technical solution adopted in the present invention is as follows：
A kind of complicated abnormal shape be combined core manufacture method, the core be variable cross-section core, including thick section core and
Thin section core, the thick section core refers to core section maximum gauge>8mm part, the thin section core refers to sand
Core section maximum gauge≤8mm part.
The manufacture method of the core comprises the following steps：
(1) preparation of metal die：
Metal die is designed according to core shape, metal die die cavity is engaged with core shape；The metal die
For fabricated structure, it is engaged and is formed by multiple submodules tool；The quantity of submodule tool can be designed according to actual needs.
(2) filling of mold cavity：
First, the submodule tool corresponding to thick section core is assembled, then the thick section core institute in mold cavity
Corresponding area filling furane resins, send general resin or furane resins and send the mixed sand of general resin；Then, remaining son is assembled
Mould, then reserved area (the thin section core institute i.e. in mold cavity being packed into from sand inlet in mold cavity using precoated sand
Corresponding region)；The sand inlet is arranged on the submodule tool corresponding to thin section core.
(3) core is molded：
Metal die is heated, makes core hardened forming；The position of metal die heating is precoated sand fill area,
Heating-up temperature is 120~200 DEG C, and the heat time is 1~2 minute.The core after shaping is taken out in die sinking after heating.
The present invention design principle and have the beneficial effect that：
(1) present invention is using furane resins mixed sand or sends general mixed with resin sand and precoated sand, produces a kind of complexity
Special-shaped core, position gas forming amount is small greatly, deformability is good, defeated and dispersed cleaning is easy and moderate strength for the core thickness after shaping, and core
The filling of thin-walled position is complete, intensity is higher, can meet use requirement.
(2) complicated abnormal shape core manufacture method of the present invention, that is, overcome furans or send general mixed with resin sand can not be molded carefully
The defect of long weakness core, solves the shortcomings of precoated sand coremaking gas forming amount is excessive, deformability is poor, cleaning is difficult, especially fits again
The complicated core joined for thin and thick.
(3) the inventive method manufacture is a kind of integral sand core, and the core dimensional accuracy to be formed is combined than polylith core more
It is high.
(4) the inventive method has broken the tixed thinking of core-making method in the industry, by being combined integrated innovation, achieves good
Technique effect.
Brief description of the drawings
Fig. 1 is the dendritic sand core structure figure of embodiment 1.
Fig. 2 is the dendritic special-shaped core core-making method schematic diagram of embodiment 1.
Fig. 3 is the polycyclic sand core structure figure of embodiment 2.
Fig. 4 is the special-shaped core core-making method schematic diagram of the polycyclic of embodiment 2.
In figure：1- thickness section core；The thin section cores of 2-；3- sand inlets；41- submodules have A；42- submodules have B；43- submodules
Has C；44- submodules have D；45- submodules have E；46- submodules have F；47- submodules have G；48- submodules have H.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The present invention is combined the manufacture method of core for complicated abnormal shape, and process is as follows：
(1) mould is combined metal mould, including multiple submodules have, and mold shape and quantity are carried out according to core shape
Design.
(2) according to the maximum cross-section thickness of core, it is divided into thick section core (core section maximum gauge>8mm)
With thin section core (core section maximum gauge≤8mm)；First the corresponding submodule tool of thick section core filling region is assembled,
Using furans or send the thickness of general mixed with resin sand filling mold cavity big and easily fill position (thick section core filling region),
And it is temporarily reserved to be molded position (thin section core filling region) for weak part in sand core structure and being difficult to；Then, assemble
Remaining submodule tool, then uses overlay film sandfilling reserved area from sand inlet.
(3) metal die is heated, makes core hardened forming；The metal die heating position is precoated sand filling part
Position, heating-up temperature is 120~200 DEG C, and the heat time is 1~2 minute.
(4) compound core is taken out after molding.
The inventive method takes full advantage of the performances such as mobility, gas-forming property, deformability and the intensity of variety classes mixed sand
Feature, can produce the special-shaped core of complex-shaped, thin and thick handing-over, with the thick big position gas forming amount of core is small, deformability is good, routed
Dissipate cleaning easily and moderate strength, and the filling of core thin-walled position is complete, intensity is higher meets use requirement.The inventive method
The core that furans can be obtained or send general mixed with resin sand not to be molded；Simultaneously such a special-shaped core than using precoated sand system completely
The core gas forming amount made is lower, deformability is more preferable, core is defeated and dispersed is easier and core shaping qualification rate is high.
Embodiment 1
Certain dendritic oil circuit core is combined core-making method, and shown in Fig. 1 and Fig. 2, specific manufacturing process is as follows：
(1) Mold Making：Make metal die (including submodule tool A41, submodule tool B42 and submodule tool C43).
(2) assembled portion mould：Assemble submodule tool A41 and submodule tool B42.
(3) general mixed with resin sand is sent in addition：To the big position of thickness in mold cavity, the i.e. corresponding region of thick section core 1
General mixed with resin sand is sent in interior filling, and core weak part, the i.e. corresponding region of thin section core 2 are temporarily reserved and are not filled with sending
General mixed with resin sand.
(4) mould is reassembled：Assemble submodule tool C43.
(5) precoated sand is filled：Core weak part is filled from sand inlet 3 using precoated sand, i.e., thin section core 2 is corresponding
Region.
(6) core is hardened：Mould is heated, heating position is that precoated sand fills position, and heating-up temperature is 120~200 DEG C, plus
The hot time is 1~2 minute.
(7) die sinking takes core：Submodule tool A41, submodule tool B42 and submodule tool C43 are opened, compound core is taken out.
Through actual production aluminium alloy castings, 730 DEG C of pouring temperature is prepared using compound core with original complete precoated sand
Core compare, bleb defect is greatly reduced, and the fiery defect of choking disappears, and crack defect disappears, and core cleaning is more
Easily.
Embodiment 2
Certain polycyclic oil circuit core is combined core-making method, and as shown in Figure 3 and Figure 4, specific manufacturing process is as follows：
(1) Mold Making：Making metal die (including submodule tool D44, submodule tool E45, F submodule tool 46, submodule tool G47
Has H48 with submodule).
(2) assembled portion mould：Assemble submodule tool D44, submodule tool E45, F submodule tool 46 and submodule tool H48.
(3) furane resins mixed sand is added：To the big position of thickness in mold cavity, the i.e. corresponding region of thick section core 1
Interior filling furane resins mixed sand, and core weak part, the i.e. corresponding region of thin section core 2 are temporarily reserved and are not filled with sending
General mixed with resin sand.
(4) mould is reassembled：Assemble submodule tool G47.
(5) precoated sand is filled：Core weak part, i.e., the thin correspondence of section core 2 are filled from sand inlet 5 ' using precoated sand
Region.
(6) core is hardened：Mould is heated, heating position is that precoated sand fills position, and heating-up temperature is 120~200 DEG C, plus
The hot time is 1~2 minute.
(7) die sinking takes core：Submodule tool D44, submodule tool E45, F submodule tool 46, submodule tool G47 and submodule tool H48 are opened,
Take out compound core.
Through actual production aluminium alloy castings, 710 DEG C of pouring temperature is prepared using compound core with original complete precoated sand
Core compare, choke fiery defect of casting disappears, and crack defect disappears, and core cleaning is more prone to.
Claims (3)
1. a kind of complicated abnormal shape is combined the manufacture method of core, it is characterised in that：The core is variable cross-section core, the system of core
The method of making comprises the following steps：
(1) preparation of metal die：
Metal die is designed according to core shape, metal die die cavity is engaged with core shape；The metal die is group
Box-like structure, is engaged by multiple submodules tool and formed；
(2) filling of mold cavity：
First, the submodule tool corresponding to thick section core is assembled, then in mold cavity corresponding to the core of thick section
Area filling furan resin-sand and one or both of Pai Pu resin sands；Then, remaining submodule tool is assembled, then from entering sand
Mouth is packed into the reserved area in mold cavity, i.e., the region in mold cavity corresponding to thin section core using precoated sand；Institute
State thick section core and refer to core section maximum gauge>8mm part, the thin section core refers to core section maximum gauge
Part during≤8mm；
(3) core is molded：
Metal die is heated, makes core hardened forming, the position of metal die heating is precoated sand fill area, heating
Temperature is 120~200 DEG C, and the heat time is 1~2 minute；The core after shaping is taken out after die sinking.
2. complicated abnormal shape according to claim 1 is combined the manufacture method of core, it is characterised in that：In step (1), submodule
The quantity of tool is designed according to actual needs.
3. complicated abnormal shape according to claim 1 or 2 is combined the manufacture method of core, it is characterised in that：In step (2),
The sand inlet is arranged on the submodule tool corresponding to thin section core.
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| CN105170911B true CN105170911B (en) | 2017-10-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105478668A (en) * | 2015-12-27 | 2016-04-13 | 无锡市灵通铸造有限公司 | Novel sand mold |
| CN106111898A (en) * | 2016-08-31 | 2016-11-16 | 广西玉柴机器股份有限公司 | Staged core mold |
| CN106111899A (en) * | 2016-08-31 | 2016-11-16 | 广西玉柴机器股份有限公司 | The core-making method of staged core mold |
| CN106238685A (en) * | 2016-08-31 | 2016-12-21 | 广西玉柴机器股份有限公司 | The manufacturing process of quick shaping core |
| CN106853511A (en) * | 2017-01-06 | 2017-06-16 | 芜湖市金贸流体科技股份有限公司 | The mode of production of high-accuracy gate valve plate sealing surface |
| CN110421121B (en) * | 2019-08-29 | 2021-01-22 | 贵州安吉航空精密铸造有限责任公司 | Manufacturing method of exhaust oil pipe core used in casting process |
| CN114082894B (en) * | 2021-11-10 | 2024-01-23 | 中国航发南方工业有限公司 | Casting method for thin-wall casting and special-shaped section pipeline sand core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101480701A (en) * | 2008-12-04 | 2009-07-15 | 苏州明志科技有限公司 | Cold-hot combination type core molding technique |
| US8122942B2 (en) * | 2009-05-29 | 2012-02-28 | General Electric Company | Casting processes and yttria-containing facecoat material therefor |
| CN201644706U (en) * | 2010-03-26 | 2010-11-24 | 大连远景铸造有限公司 | Core shooting combined mold |
| CN101985157B (en) * | 2010-10-29 | 2012-07-25 | 内蒙古第一机械制造（集团）有限公司 | Core making method for ''diphase'' sand mould core hardened by CO2 gas |
| CN103192035B (en) * | 2012-01-05 | 2015-08-05 | 广西玉柴机器股份有限公司 | Compound core penetrates sand device and method |
| CN104475685B (en) * | 2014-11-14 | 2017-01-11 | 华中科技大学 | Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting |
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