CN105170911A - Manufacturing method for complex specially-shaped composite sand core - Google Patents

Manufacturing method for complex specially-shaped composite sand core Download PDF

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Publication number
CN105170911A
CN105170911A CN201510548867.5A CN201510548867A CN105170911A CN 105170911 A CN105170911 A CN 105170911A CN 201510548867 A CN201510548867 A CN 201510548867A CN 105170911 A CN105170911 A CN 105170911A
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China
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core
sand
sand core
thick
thin
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CN201510548867.5A
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Chinese (zh)
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CN105170911B (en
Inventor
冯志军
石飞
吴江
李宇飞
王伟
占亮
阮明
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沈阳铸造研究所
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Abstract

The invention discloses a manufacturing method for a complex specially-shaped composite sand core, and belongs to the technical field of a manufacturing method for a casting sand core. The manufacturing method comprises the following steps: firstly, filling a thick and easy-to-fill part of a mould cavity with furan and/or PEP-SET resin, temporarily reserving a thin part and a difficult-to-form part in the sand core structure, and filling a reserved area with pre-coated sand from a sand inlet after a metal mould is assembled; heating the metal mould, and hardening and forming the sand core; and opening the mould to take out the composite sand core. The manufacturing method disclosed by the invention can be adopted to produce a specially-shaped sand core with a complex shape and an inconsistent thickness by sufficiently utilizing performance characteristics of mobility, gas-forming property, deformability, strength and the like of different kinds of mixed sand; and the thick part of the sand core is small in gas-forming amount, good in deformability, easy to scatter and clear, and moderate in strength; and a thin part of the sand core is filled completely, has relatively strength and can meet using requirements.

Description

A kind of manufacture method of complicated abnormal shape compound core

Technical field

The present invention relates to the manufacture method technical field of sand core for casting, be specifically related to a kind of manufacture method of complicated abnormal shape compound core.

Background technology

Some complex aluminiums in the fields such as current Aeronautics and Astronautics, Mg alloy castings, inner containing different complex-shaped surface mould structure, there are the narrow cavity configurations such as elongate curved oil pipe shape, three dimendional blade shape, also have the large cavity configuration of barrel-shaped, annular uniform thickness, also have the Complex Different Shape structure such as variable cross-section, thin and thick handing-over.Shaping for cast-internal cavity structure, adopts the method for core casting then defeated and dispersed core usually.Core is shaping mainly contains precoated sand, furan resin-sand, send the methods such as general resin sand.

Furan resin-sand or send general resin sand coremaking, sand core strength is moderate, core gas forming amount and deformability better, be mainly used in thick large core, and for containing narrow thin class cores such as elongated oil circuit, three dimendional blades, adopt furan resin-sand or send general resin sand then cannot coremaking shaping, because mobility is relatively poor on the one hand, be not enough to filling molding, be due to insufficient strength on the other hand, cannot instructions for use be met.

For the preparation method containing narrow thin class cores such as elongated oil circuit, three dimendional blades, mainly adopt precoated sand shaping at present, this is because precoated sand has good mobility, be easy to fill mold cavity, and shaping rear intensity is higher, the requirement of strength that core uses can be met.But, in production practices, use film covered sand core, still there is following defect: in (1) precoated sand, resin content is higher, in casting process, contact with high temperature fluent metal, can produce a large amount of gas, and the core overwhelming majority is all wrapped up by liquid metal, a large amount of gases of generation enter liquid metal, cause foundry goods to choke fiery defect, often cause foundry goods to be scrapped; (2) film covered sand core has the high advantage of intensity, but also bring the defects such as core deformability is poor, the defeated and dispersed cleaning difficulty of core simultaneously, especially for region thicker in core, because deformability difference easily cracks defect in casting solidification process, and after moulding by casting, film covered sand core is defeated and dispersed and intensity is still very high, clears up very difficult; (3) for the Complex Different Shape core of variable cross-section, thin and thick handing-over, employing precoated sand manufactures, except above-mentioned defect, also there are the following problems: one is in precoated sand heat hardening process, temperature heat needed for thin, the thick position of core is inconsistent, causes that core thin-walled position is easily burnt crisp and thick large part sclerosis is insufficient; Two is that the expanded by heating situation of the expanded by heating at thin, thick position and metal die is inconsistent, cause taking out core difficulty, and the as easy as rolling off a log core that makes ruptures.

Summary of the invention

In order to overcome the problems referred to above that current sand core for casting exists, the object of the present invention is to provide a kind of manufacture method of complicated abnormal shape compound core, the method takes full advantage of mobility, gas-forming property, the performance characteristics such as deformability and intensity of variety classes mixed sand, complicated abnormal shape core that is complex-shaped, thin and thick handing-over can be produced, have that core thick large part gas forming amount is little, deformability good, defeated and dispersed cleaning easily and moderate strength, and the position filling of core thin-walled is complete, intensity is higher meets instructions for use.The inventive method can obtain furans or send the core that general mixed with resin sand cannot be shaping, simultaneously this kind of different in nature core than adopting that the core gas forming amount of precoated sand manufacture is lower, deformability is better completely, core is defeated and dispersed easier and the shaping qualification rate of core is high, in addition, the manufacture of complexity of the present invention different in nature core core-making method be an integral sand core, the core dimensional accuracy be combined to form than polylith core is higher.

For achieving the above object, the technical solution adopted in the present invention is as follows:

A kind of manufacture method of complicated abnormal shape compound core, described core is variable cross-section core, comprise thick cross section core and thin cross section core, described thick cross section core refers to the part of core cross section maximum gauge >8mm, and described thin cross section core refers to the part of core cross section maximum gauge≤8mm.

The manufacture method of described core comprises the steps:

(1) preparation of metal die:

According to core profile design metal die, metal die die cavity and core matching form are closed; Described metal die is fabricated structure, and being matched by multiple submodule tool forms; The quantity of submodule tool can design according to actual needs.

(2) filling of mold cavity:

First, the submodule tool corresponding to the core of thick cross section is assembled, the area filling furane resins then in mold cavity corresponding to the core of thick cross section, send general resin or furane resins and send the mixed sand of general resin; Then, assemble remaining submodule tool, then be packed into the reserved area (region namely in mold cavity corresponding to the core of thin cross section) in mold cavity from sand inlet employing precoated sand; Described sand inlet is arranged on the submodule tool corresponding to the core of thin cross section.

(3) core is shaping:

Metal die is heated, makes core hardened forming; The position of metal die heating is precoated sand fill area, and heating-up temperature is 120 ~ 200 DEG C, and the heat time is 1 ~ 2 minute.Core after heating rear die sinking taking-up is shaping.

Design principle of the present invention and beneficial effect as follows:

(1) the present invention utilizes furane resins mixed sand or sends general mixed with resin sand and precoated sand, produce a kind of complicated abnormal shape core, core after shaping thick large part gas forming amount is little, deformability good, defeated and dispersed cleaning easy and moderate strength, and the position filling of core thin-walled is complete, intensity is higher, instructions for use can be met.

(2) complicated abnormal shape core manufacture method of the present invention, namely overcome furans or send general mixed with resin sand cannot the defect of the weak core of molding long and thin, solve again the shortcomings such as precoated sand coremaking gas forming amount is excessive, deformability is poor, cleaning is difficult, be particularly useful for the complicated core of thin and thick handing-over.

(3) the inventive method manufacture is a kind of integral sand core, and the core dimensional accuracy be combined to form than polylith core is higher.

(4) the inventive method has broken the tixed thinking of core-making method in the industry, by compound integrated innovation, achieves good technique effect.

Accompanying drawing explanation

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 embodiment 2 polycyclic sand core structure figure.

Fig. 4 is embodiment 2 polycyclic special-shaped core core-making method schematic diagram.

In figure: the core of 1-thick cross section; 2-thin cross section core; 3-sand inlet; 41-submodule tool A; 42-submodule tool B; 43-submodule tool C; 44-submodule tool D; 45-submodule tool E; 46-submodule tool F; 47-submodule tool G; 48-submodule tool H.

Detailed description of the invention

Below in conjunction with drawings and Examples in detail the present invention is described in detail.

The present invention is the manufacture method of complicated abnormal shape compound core, and process is as follows:

(1) mould is combined metal mould, comprises multiple submodule tool, and mold shape and quantity basis core shape design.

(2) according to the maximum cross-section thickness of core, thick cross section core (core cross section maximum gauge >8mm) and thin cross section core (core cross section maximum gauge≤8mm) is divided into; First submodule tool corresponding for core fill area, thick cross section is assembled, adopt furans or send general mixed with resin sand fill mold cavity greatly thick and easily fill position (core fill area, thick cross section), and for weak part in sand core structure and be difficult to shaping position (core fill area, thin cross section) and temporarily reserve; Then, assemble remaining submodule tool, then adopt precoated sand filling reserved area from sand inlet.

(3) to metal die heating, core hardened forming is made; Described metal die heating position is precoated sand filling position, and heating-up temperature is 120 ~ 200 DEG C, and the heat time is 1 ~ 2 minute.

(4) compound core is taken out after die sinking.

The inventive method takes full advantage of mobility, gas-forming property, the performance characteristics such as deformability and intensity of variety classes mixed sand, special-shaped core that is complex-shaped, thin and thick handing-over can be produced, have that core thick large part gas forming amount is little, deformability good, defeated and dispersed cleaning easily and moderate strength, and the position filling of core thin-walled is complete, intensity is higher meets instructions for use.The inventive method can obtain furans or send the core that general mixed with resin sand cannot be shaping; Simultaneously this kind of special-shaped core than adopting that the core gas forming amount of precoated sand manufacture is lower, deformability is better completely, core is defeated and dispersed easier and the shaping qualification rate of core is high.

Embodiment 1

Certain dendritic oil circuit core compound core-making method, shown in Fig. 1 and Fig. 2, concrete manufacture process is as follows:

(1) Mold Making: make metal die (comprising submodule tool A41, submodule tool B42 and submodule tool C43).

(2) assembled portion mould: assembling submodule tool A41 and submodule tool B42.

(3) general mixed with resin sand is sent in interpolation: to the thick large part in mold cavity, fill in the region of i.e. thick cross section core 1 correspondence and send general mixed with resin sand, and core weak part, namely the region of thin cross section core 2 correspondence is temporarily reserved and do not fill and send general mixed with resin sand.

(4) refill and join mould: assembling submodule tool C43.

(5) precoated sand is filled: adopt precoated sand to fill core weak part from sand inlet 3, i.e. the region of thin cross section core 2 correspondence.

(6) core sclerosis: heating mould, heating position is precoated sand filling position, and heating-up temperature is 120 ~ 200 DEG C, and the heat time is 1 ~ 2 minute.

(7) core is got in die sinking: open submodule tool A41, submodule tool B42 and submodule tool C43, takes out compound core.

Through actual production aluminium alloy castings, pouring temperature 730 DEG C, compared with the core adopting compound core and original complete precoated sand to prepare, bleb defect significantly reduces, and fiery defect of choking disappears, and crack defect disappears, and core cleaning is more prone to.

Embodiment 2

Certain polycyclic oil circuit core compound core-making method, as shown in Figure 3 and Figure 4, concrete manufacture process is as follows:

(1) Mold Making: make metal die (comprising submodule tool D44, submodule tool E45, F submodule tool 46, submodule tool G47 and submodule tool H48).

(2) assembled portion mould: assembling submodule tool D44, submodule tool E45, F submodule tool 46 and submodule tool H48.

(3) furane resins mixed sand is added: to the thick large part in mold cavity, furane resins mixed sand is filled in the region of i.e. thick cross section core 1 correspondence, and core weak part, namely the region of thin cross section core 2 correspondence is temporarily reserved and do not fill and send general mixed with resin sand.

(4) refill and join mould: assembling submodule tool G47.

(5) precoated sand is filled: adopt precoated sand to fill core weak part from sand inlet 5 ', i.e. the region of thin cross section core 2 correspondence.

(6) core sclerosis: heating mould, heating position is precoated sand filling position, and heating-up temperature is 120 ~ 200 DEG C, and the heat time is 1 ~ 2 minute.

(7) core is got in die sinking: open submodule tool D44, submodule tool E45, F submodule tool 46, submodule tool G47 and submodule tool H48, takes out compound core.

Through actual production aluminium alloy castings, pouring temperature 710 DEG C, compared with the core adopting compound core and original complete precoated sand to prepare, foundry goods fiery defect of choking disappears, and crack defect disappears, and core is cleared up and is more prone to.

Claims (5)

1. a manufacture method for complicated abnormal shape compound core, is characterized in that: described core is variable cross-section core, and the manufacture method of core comprises the steps:
(1) preparation of metal die:
According to core profile design metal die, metal die die cavity and core matching form are closed; Described metal die is fabricated structure, and being matched by multiple submodule tool forms;
(2) filling of mold cavity:
First, the submodule tool corresponding to the core of thick cross section is assembled, the area filling furane resins then in mold cavity corresponding to the core of thick cross section and one or both in Pai Pu resin; Then, assemble remaining submodule tool, then be packed into the reserved area in mold cavity from sand inlet employing precoated sand, the region namely in mold cavity corresponding to the core of thin cross section;
(3) core is shaping:
Metal die is heated, makes core hardened forming; Take out after die sinking shaping after core.
2. the manufacture method of complicated abnormal shape compound core according to claim 1, is characterized in that: in step (1), the quantity of submodule tool designs according to actual needs.
3. the manufacture method of complicated abnormal shape compound core according to claim 1 and 2, it is characterized in that: in step (2), described sand inlet is arranged on the submodule tool corresponding to the core of thin cross section.
4. the manufacture method of complicated abnormal shape compound core according to claim 1, it is characterized in that: in step (2), described thick cross section core refers to the part of core cross section maximum gauge >8mm, and described thin cross section core refers to part during maximum gauge≤8mm of core cross section.
5. the manufacture method of complicated abnormal shape compound core according to claim 1, is characterized in that: in step (3), and the position of metal die heating is precoated sand fill area, and heating-up temperature is 120 ~ 200 DEG C, and the heat time is 1 ~ 2 minute.
CN201510548867.5A 2015-08-31 2015-08-31 A kind of complicated abnormal shape is combined the manufacture method of core CN105170911B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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
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
CN106111898A (en) * 2016-08-31 2016-11-16 广西玉柴机器股份有限公司 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
CN110421121A (en) * 2019-08-29 2019-11-08 贵州安吉航空精密铸造有限责任公司 A kind of vent control valve tube core manufacturing method in casting technique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN201644706U (en) * 2010-03-26 2010-11-24 大连远景铸造有限公司 Core shooting combined mold
US20100300640A1 (en) * 2009-05-29 2010-12-02 General Electric Company Casting processes and yttria-containing facecoat material therefor
CN101985157A (en) * 2010-10-29 2011-03-16 内蒙古第一机械制造(集团)有限公司 Core making method for diphasic sand mould core hardened by CO2 gas
CN103192035A (en) * 2012-01-05 2013-07-10 广西玉柴机器股份有限公司 Composite sand core sand shooting device and method
CN104475685A (en) * 2014-11-14 2015-04-01 华中科技大学 Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20100300640A1 (en) * 2009-05-29 2010-12-02 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
CN101985157A (en) * 2010-10-29 2011-03-16 内蒙古第一机械制造(集团)有限公司 Core making method for diphasic sand mould core hardened by CO2 gas
CN103192035A (en) * 2012-01-05 2013-07-10 广西玉柴机器股份有限公司 Composite sand core sand shooting device and method
CN104475685A (en) * 2014-11-14 2015-04-01 华中科技大学 Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting

Cited By (6)

* Cited by examiner, † Cited by third party
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
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
CN106111898A (en) * 2016-08-31 2016-11-16 广西玉柴机器股份有限公司 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
CN110421121A (en) * 2019-08-29 2019-11-08 贵州安吉航空精密铸造有限责任公司 A kind of vent control valve tube core manufacturing method in casting technique

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