CN103182471B - Casting technology for vacuum pump box body - Google Patents
Casting technology for vacuum pump box body Download PDFInfo
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- CN103182471B CN103182471B CN201110456010.2A CN201110456010A CN103182471B CN 103182471 B CN103182471 B CN 103182471B CN 201110456010 A CN201110456010 A CN 201110456010A CN 103182471 B CN103182471 B CN 103182471B
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Abstract
The invention discloses a casting technology for a vacuum pump box body, which is used in the aviation field, and comprises the steps of casting mold making, casting and mold opening; the casting mold making step comprises the following steps: a metal upper cavity die and a metal lower cavity die processing procedure, an inner cavity sand core making procedure, a lower core procedure and a die locking procedure; after finishing the die locking procedure, the upper cavity die and the lower cavity die encircle to form a cavity die of the casting mold, the surface of the die cavity of the upper cavity die and the surface of the die cavity of the lower cavity die form the inner surface of the cavity die, and the cavity of the casting mold is formed between the inner cavity sand core and the inner surface of the cavity die; the lower cavity die is provided with a pouring cup stretching out of the cavity die; and in the cavity die, straight pouring runners are arranged along two sides of the cavity, the straight pouring runner is axially communicated with the pouring cup, the straight pouring runner is communicated with the cavity in the radial direction through an inner pouring gate, and an overflow feed head is arranged between the cavity and the pouring cup.
Description
Technical field
The present invention relates to a kind of vacuum pump box body casting process for aviation field.
Background technology
Refer to Fig. 1, vacuum pump box body 100 is critical components of vavuum pump, and vacuum pump box body mostly is foundry goods, and its outline is for being about the rectangular box of 230mm × 170mm × 95mm.Customer requirement casting dimension accuracy is high, flat appearance, clear-cut are complete; Cast-internal dense structure, and the casting flaw such as pore-free or shrinkage porosite; Vacuum pump box body castings material is alusil alloy, and the mechanical performance of vacuum pump box body foundry goods must reach tensile strength >=170Mpa, yield strength >=100Mpa, hardness >=75HB; And require No leakage under 2 atmospheric pressure; Thickness again due to vacuum pump box body foundry goods is on average interval at 5-6mm, but also there is the isolated thick large wall construction 101 of many places Wall-Thickness Difference more than 2 times; Therefore difficulty is cast larger.Be generally adopt full sand mold gravity foundry technology to produce at present both at home and abroad, there is following shortcoming in this technique: 1) surface roughness are larger; 2) cast-internal organizes coarse grains, foundry goods mechanical performance poor (cast properties of equal material sand casting production can only reach tensile strength >=150Mpa, yield strength >=90Mpa, hardness >=60HB); 3) casting system is more complicated; 4) moulding sand consumption is large, and production environment is severe; 5) production efficiency is low.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of vacuum pump box body casting process is provided, it can solve in current gravity casting technique, produce splash, turbulent flow and make the foundry goods of described vacuum pump box body produce the technical problem of the casting flaws such as slag inclusion, pore, cold shut.
A kind of technical scheme realizing above-mentioned purpose is: a kind of vacuum pump box body casting process, comprises casting die making step, casting step and die sinking step;
Described casting die making step comprises: metal upper impression mould and metal lower impressions mould manufacturing procedure, inner chamber core production process, core setting and matched moulds operation;
In described inner chamber core production process, make upper core and lower core respectively;
In described core setting, described upper core puts into the patrix of the described casting die of die cavity formation of described upper impression mould, and described lower inner cavity core puts into the die cavity of described lower impressions mould, forms the counterdie of described casting die;
Described patrix and described counterdie are being closed up, after completing described matched moulds operation, described upper impression mould and described lower impressions mould surround the swaging die of described casting die, the cavity surface of described upper impression mould and the cavity surface of described lower impressions mould form the inner surface of described swaging die, described upper core and described lower core merge the inner chamber core becoming described casting die, form the die cavity of described casting die between the inner surface of described swaging die and described inner chamber core; Described lower impressions mould arranges the cup that is stretched out described swaging die; In described swaging die, the both sides along described die cavity arrange direct current running channel respectively, and described direct current running channel is axially communicated with described cup, and described direct current running channel is communicated with described die cavity radial through ingate, arranges satrain relief between described die cavity and described cup;
Described casting step comprises: melting operation metal melting being obtained molten metal, described molten metal is poured into described cup (11), to vert the quiescent pouring operation of described casting die simultaneously, and make described molten metal be full of described die cavity (42), cool and the molding procedure of solidifying;
Described die sinking step comprises: die sinking operation, removal cast gate and rising head operation and removal inner chamber core operation.
Further, in described inner chamber core production process, in core or lower core, some chills are set on described.
Further, described upper core and described lower interior core are all that 50 to 100 object precoated sands are made by particle diameter.
Further, in the die cavity of described upper impression mould and the die cavity of lower impressions mould, positioning seat is set respectively, is respectively used to lay described upper core and lower core.
Further, before described core setting, upper impression mould described in preheating and described lower impressions mould (1), and remove the rusty stain of the cavity surface of described upper impression mould and the cavity surface of described lower impressions mould, and in the cavity surface of described upper impression mould and the cavity surface release agent application of described lower impressions mould.
Further, in the melting operation of described casting step, the metal of melting is alusil alloy, thus obtains alusil alloy molten metal, and the temperature of described melting operation is 730 to 750 DEG C.
Further, before described quiescent pouring operation, cleaning process is carried out to described alusil alloy molten metal.
Further, described quiescent pouring operation is carried out on quiescent pouring machine, and described in described quiescent pouring operation, the temperature of alusil alloy molten metal is 720 to 730 DEG C, and the time of described quiescent pouring step lasts is 7 to 12 seconds.
Further, the time of described forming step lasts is 200 seconds.
Further, after described die sinking step, fine finishining process is carried out to described vacuum pump box body.
Have employed the technical scheme of a kind of vacuum pump box body casting process of the present invention, namely adopt quiescent pouring technology generations for traditional gravity casting technique.Its technique effect is: in casting step, and molten metal injects in the die cavity of described casting die reposefully, and avoid owing to producing splashing, turbulent flow in gravity casting process, thus vacuum pump box body foundry goods can not produce the casting flaws such as slag inclusion, pore, cold shut; Gas in the process of casting in die cavity is easy to discharge, and exhaust effect is fine, avoids the casting flaws such as the generation of vacuum pump box body foundry goods is felt suffocated, poured short.
Accompanying drawing explanation
Fig. 1 is the structural representation of vacuum pump box body.
Fig. 2 a is the core overview of casting die in a kind of vacuum pump box body casting process of the present invention.
Fig. 2 b is the core front view of casting die in a kind of vacuum pump box body casting process of the present invention.
Fig. 2 c is the core left view of casting die in a kind of vacuum pump box body casting process of the present invention.
Fig. 2 d is the A-A face sectional view of Fig. 2 b.
Fig. 3 is the decomposing schematic representation of casting die in a kind of vacuum pump box body casting process of the present invention.
Fig. 4 a be in a kind of vacuum pump box body casting process of the present invention casting die look up structural representation.
Fig. 4 b is the fragmentary top TV structure schematic diagram of casting die in a kind of vacuum pump box body casting process of the present invention.
Fig. 5 is direct current running channel and the runner section schematic diagram of casting die in a kind of vacuum pump box body casting process of the present invention.
Detailed description of the invention
Refer to Fig. 2 a to Fig. 5, in order to understand technical scheme of the present invention better, be described in detail by reference to the accompanying drawings below by embodiment particularly:
In the present embodiment, the casting raw material of use is alusil alloy.
Refer to Fig. 2 a to Fig. 5, a kind of vacuum pump box body casting process of the present invention comprises: casting die making step, casting step and die sinking step;
Described casting die making step comprises: metal upper impression mould 2 and metal lower impressions mould 1 manufacturing procedure, making inner chamber core 3 operation, core setting and matched moulds operation;
The reason of upper impression mould 2 and described lower impressions mould 1 described in intermetallic composite coating is adopted to be: to adopt upper impression mould 1 and described lower impressions mould 2 described in intermetallic composite coating, coordinate with described inner chamber core 3, because metal has good cooling effect, compared with the foundry goods that full sand mold mould is cast, dense materials degree is high, good airproof performance, good mechanical property, dimensional accuracy is high; And save a large amount of molding sand than sand casting, energy-saving effect is remarkable.
Make in inner chamber core 3 operation, make upper core and lower core respectively, in described upper core and described lower core be all adopt particle diameter 50 ~ 100 object precoated sands shape respectively with described on make in the metal die that matches of core and described lower core profile and obtain.On making is described before core and described lower core, described metal die to use on heated by natural gas utensil at 200 ~ 440 DEG C preheating 30 minutes.In the process that core and described lower core make on making is described, in described upper core or lower core, some chills 31 are set.Described chill 31 of stating is increase foundry goods Local cooling speed, the metal chills thing laid in embedding or die cavity on sand mold, core surface.The object of such design is; By arranging chill in described inner chamber core 3, solve vacuum pump box body 100 foundry goods exists the defect such as shrinkage porosite, pore technical problem at isolated thick large wall construction 101 place tissue.
Before described core setting, the die cavity of described upper impression mould 2 is put into by described upper core, obtain the patrix of described casting die, described lower core is put into the die cavity of described lower impressions mould 1, before obtaining the counterdie of described casting die, will carry out the pre-heat treatment to described upper impression mould 2 and described lower impressions mould 1, the pre-heat treatment is carried out on heated by natural gas utensil, and the temperature of preheating is 200 ~ 350 DEG C.After preheat, the process of surperficial rusty stain and foreign material will be removed to the cavity surface of the cavity surface of described upper impression mould 2 and described lower impressions mould 1, and at the cavity surface of described upper impression mould 2 and the cavity surface coating releasing agent of described lower impressions mould 1, these releasing agents are all to have bought in market.
In the present embodiment, in the die cavity of described upper impression mould 2, positioning seat (not shown) being set, for laying upper core, in the die cavity of described lower impressions mould 1, lower positioning seat 12 being set, for laying lower core.
Described matched moulds operation, merges by described patrix and described counterdie the operation becoming described casting die and completes on quiescent pouring machine.After completing matched moulds operation, described upper impression mould 2 and described lower impressions mould 1 surround the swaging die 4 of described casting die, the cavity surface of described upper impression mould 2 and the cavity surface of described lower impressions mould 1 surround the inner surface of described casting die, described upper core and described lower core are merged into the inner chamber core 3 of described casting die, in the space that the die cavity of die cavity and described lower impressions mould 1 that described inner chamber core 3 is placed in described upper impression mould 2 surrounds, the built-in some chills 31 of described inner chamber core 3, described chill 31 in described inner chamber core 3 position correspond to the position at isolated thick large wall construction 101 place in described vacuum pump box body 100.The die cavity 42 of described casting die is formed between the inner surface of described swaging die 4 and described inner chamber core 3; Described lower impressions mould 1 there is a cup 11 (not showing in Fig. 4 b) stretching out described swaging die 4; In described swaging die 4, both sides along described die cavity 42 arrange direct current running channel 41 respectively, described direct current running channel 41 is axially communicated with described cup 11, described direct current running channel 41 is communicated with described die cavity 42 radial through ingate 44, between described die cavity 42 and described cup 11, satrain relief 43 is set, wherein said ingate 44 is the ingate of clearance type, described direct current running channel 41 needs to design according to described vacuum pump box body 100 thermal center and feeding, the internal diameter 60mm of described direct current running channel 41, the internal diameter of described ingate 44 is set to 5mm.
The quality that described cup 11 can hold molten aluminum silicon alloy is that the quality of described vavuum pump top box body 100 adds it is the quality sum of cast gate and the rising head removed in die sinking process.Cast gate and rising head are foundry goods at the clout at described ingate 44 and satrain relief 43 place.
In the present embodiment, the raw material producing described vacuum pump box body is alusil alloy, described casting step comprises: the melting operation described alusil alloy being melted into alusil alloy molten metal, turns casting operation and described aluminium liquid is full of described die cavity, cooling the molding procedure of solidifying.
In described melting operation, the melt temperature of described alusil alloy is 730 ~ 750 DEG C.And the alusil alloy molten metal after described melting also will carry out clean process: namely obtain the alusil alloy molten metal of cleaning by conventional refining, degasification, slagging-off, the aluminium liquid treatment process such as rotten stand-by.
Described quiescent pouring operation, this operation is carried out on quiescent pouring machine, while pouring into described cup 11 by described alusil alloy molten metal, quiescent pouring machine is adopted to vert described casting die, make described direct current running channel 41 from being parallel to level ground, become perpendicular to level ground, and make described cup 11 transfer to described casting die top.In described quiescent pouring operation, the temperature of alusil alloy molten metal is 720 ~ 730 DEG C, and this operation completes within the time of 7 to 12 seconds.In this operation, the alusil alloy molten metal of melting, along described direct current running channel 41, injects in the die cavity 42 of casting die stably through described ingate 44.
Adopt quiescent pouring technique, avoid molten metal in casting cycle, produce splashing, turbulent flow, thus avoid in foundry goods casting flaws such as producing slag inclusion, pore, cold shut; In the process of simultaneously verting at mould, described ingate 44 and described satrain relief 43 can forward highest point to along with verting of mould, and opening is larger, gas in die cavity 42 described in the process of casting is easy to discharge, exhaust effect is fine, avoids the casting flaws such as foundry goods generation is felt suffocated, misrun.
Carry out the cooling of about 200 seconds in described die cavity 42 at described alusil alloy molten metal after, die sinking step is entered after coagulation forming, carrying out die sinking operation, after removing cast gate and rising head operation and removing inner chamber core operation, foundry goods is carried out to the fine finishining process such as polishing finishing and shotblasting, finally obtain vacuum pump box body.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (10)
1. a vacuum pump box body casting process, comprises casting die making step, casting step and die sinking step; It is characterized in that:
Described casting die making step comprises: metal upper impression mould and metal lower impressions mould manufacturing procedure, inner chamber core production process, core setting and matched moulds operation;
In described inner chamber core production process, make upper core and lower core respectively;
In described core setting, described upper core puts into the patrix of the described casting die of die cavity formation of described upper impression mould, and described lower core puts into the die cavity of described lower impressions mould, forms the counterdie of described casting die;
Described patrix and described counterdie are being closed up, after completing described matched moulds operation, described upper impression mould (2) and described lower impressions mould (1) surround the swaging die (4) of described casting die, the cavity surface of described upper impression mould (2) and the cavity surface of described lower impressions mould (1) form the inner surface of described swaging die (4), described upper core and described lower core merge the inner chamber core (3) becoming described casting die, the die cavity (42) of described casting die is formed between the inner surface of described swaging die (4) and described inner chamber core (3), described lower impressions mould (1) arranges the cup (11) that is stretched out described swaging die (4), in described swaging die (4), both sides along described die cavity arrange direct current running channel (41) respectively, described direct current running channel (41) is axially communicated with described cup (11), described direct current running channel (41) is communicated with described die cavity radial through ingate (42), arranges satrain relief (43) between described die cavity (42) and described cup (11),
Described casting step comprises: melting operation metal melting being obtained molten metal, described molten metal is poured into described cup (11), to vert the quiescent pouring operation of described casting die simultaneously, and make described molten metal be full of described die cavity (42), cool and the molding procedure of solidifying;
Described die sinking step comprises: die sinking operation, removal cast gate and rising head operation and removal inner chamber core operation.
2. a kind of vacuum pump box body casting process according to claim 1, is characterized in that: in described inner chamber core production process, arranges some chills on described in core or lower core.
3. a kind of vacuum pump box body casting process according to claim 1 and 2, is characterized in that: described upper core and described lower interior core are all that 50 to 100 object precoated sands are made by particle diameter.
4. a kind of vacuum pump box body casting process according to claim 1 and 2, it is characterized in that: in the die cavity of described upper impression mould (2) and the die cavity of lower impressions mould (1), positioning seat is set respectively, be respectively used to lay described upper core and lower core.
5. a kind of vacuum pump box body casting process according to claim 1 and 2, it is characterized in that: before described core setting, upper impression mould (2) described in preheating and described lower impressions mould (1), and remove the rusty stain of the cavity surface of described upper impression mould and the cavity surface of described lower impressions mould, and in the cavity surface of described upper impression mould and the cavity surface release agent application of described lower impressions mould.
6. a kind of vacuum pump box body casting process according to claim 1 and 2, it is characterized in that: in the melting operation of described casting step, the metal of melting is alusil alloy, thus obtains alusil alloy molten metal, and the temperature of described melting operation is 730 to 750 DEG C.
7. a kind of vacuum pump box body casting process according to claim 6, is characterized in that: before described quiescent pouring operation, carries out cleaning process to described alusil alloy molten metal.
8. a kind of vacuum pump box body casting process according to claim 6, it is characterized in that: described quiescent pouring operation is carried out on quiescent pouring machine, described in described quiescent pouring operation, the temperature of alusil alloy molten metal is 720 to 730 DEG C, and the time of described quiescent pouring step lasts is 7 to 12 seconds.
9. a kind of vacuum pump box body casting process according to claim 6, the time of described forming step lasts is 200 seconds.
10. a kind of vacuum pump box body casting process according to claim 6, is characterized in that: carry out fine finishining process to described vacuum pump box body after described die sinking step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110456010.2A CN103182471B (en) | 2011-12-30 | 2011-12-30 | Casting technology for vacuum pump box body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110456010.2A CN103182471B (en) | 2011-12-30 | 2011-12-30 | Casting technology for vacuum pump box body |
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| CN103182471A CN103182471A (en) | 2013-07-03 |
| CN103182471B true CN103182471B (en) | 2014-12-31 |
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| CN103691916A (en) * | 2013-12-24 | 2014-04-02 | 上海爱仕达汽车零部件有限公司 | Casting method for protecting thin-wall casting from local isolated hot spot shrinkage |
| CN105382241A (en) * | 2015-12-30 | 2016-03-09 | 上海爱仕达汽车零部件有限公司 | Casting process of oil separator box body |
| CN105382242A (en) * | 2015-12-30 | 2016-03-09 | 上海爱仕达汽车零部件有限公司 | Casting process of cylinder cover |
| CN107363227A (en) * | 2017-07-26 | 2017-11-21 | 江苏雷科德轨道交通科技有限公司 | Gear case body casting manufacture craft |
| CN109420745B (en) * | 2017-12-29 | 2024-02-02 | 湖北航特装备制造股份有限公司 | Metal type gravity tilting die for hollow thin-wall cast aluminum control arm |
| CN108555248A (en) * | 2018-01-12 | 2018-09-21 | 广东肇庆动力金属股份有限公司 | A kind of casting method and casting mould of automobile engine water pump shell |
| CN108526396B (en) * | 2018-05-07 | 2019-08-13 | 昆明冶金研究院 | A kind of manual inexpensive casting method of large aluminum alloy shell |
| CN109026824A (en) * | 2018-06-29 | 2018-12-18 | 三联泵业股份有限公司 | A kind of split type impeller for large-scale mono-hull Pulp pump |
| CN108950433A (en) * | 2018-06-29 | 2018-12-07 | 界首市众鑫科技服务有限公司 | A kind of preparation method of the split type impeller of large size mono-hull Pulp pump |
| CN109834230A (en) * | 2018-11-02 | 2019-06-04 | 唐山市鑫彬铁路配件厂 | A kind of casting die of draft gear housing |
| CN110000337A (en) * | 2019-04-26 | 2019-07-12 | 广东肇庆动力金属股份有限公司 | A kind of aluminium alloy electric casing casting mould |
| CN112475245A (en) * | 2020-11-25 | 2021-03-12 | 山东淄博燕峰活塞有限公司 | Filter base casting technology |
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| KR100247891B1 (en) * | 1998-03-24 | 2000-04-01 | 김정춘 | Hollow-type core molding- machine and milding process for turntable casting |
| JP2006075850A (en) * | 2004-09-08 | 2006-03-23 | Toyota Motor Corp | Vacuum apparatus and evacuating method |
| CN101323015B (en) * | 2008-08-28 | 2010-06-16 | 南昌航空大学 | Rotated mold technique of iron mold using compound punch type pressure heat-preserving casting system |
| CN101590519B (en) * | 2009-06-26 | 2010-09-08 | 宁波强盛机械模具有限公司 | Process for casting aluminum alloy air intake manifold |
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