CN109773160A - The low-pressure casting process of aluminum alloy impeller - Google Patents

The low-pressure casting process of aluminum alloy impeller Download PDF

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Publication number
CN109773160A
CN109773160A CN201910249547.8A CN201910249547A CN109773160A CN 109773160 A CN109773160 A CN 109773160A CN 201910249547 A CN201910249547 A CN 201910249547A CN 109773160 A CN109773160 A CN 109773160A
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CN
China
Prior art keywords
impeller
aluminum alloy
pressure casting
sand core
low
Prior art date
Application number
CN201910249547.8A
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Chinese (zh)
Inventor
李兴华
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山东鸿源新材料有限公司
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Priority to CN201910249547.8A priority Critical patent/CN109773160A/en
Publication of CN109773160A publication Critical patent/CN109773160A/en

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Abstract

The invention belongs to the manufacturing fields of centrifugal blower impeller, and in particular to a kind of low-pressure casting process of aluminum alloy impeller.The following steps are included: (1) uses thermosetting phenolic resin precoated sand, impeller inner cavity blade sand core is produced using overlay film sand core production method;(2) it is dried after blade sand core outer surface coating refractory coating;(3) body mold of impeller is attached on air injection machine to working surface spray coating heat preservation adiabatic coating after being preheated to 200~240 DEG C;(4) body mold is put into blade sand core after being preheating to 300~400 DEG C, carries out low pressure casting, and molten aluminum obtains aluminum alloy impeller after entering the solidification of type chamber.Aluminum alloy impeller prepared by the present invention, shape is completely clear, and dimensional accuracy is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets the requirement of blower.

Description

The low-pressure casting process of aluminum alloy impeller

Technical field

The invention belongs to the manufacturing fields of centrifugal blower impeller, and in particular to a kind of low pressure casting of aluminum alloy impeller Make technique.

Background technique

The production field of aluminum alloy impeller at present, main process have one kind, are outside being made using self-hardening resin sand Type, precoated sand or cold-box sand make sand core, and casting molten aluminum obtains aluminum alloy impeller after the combination of type core.The drawbacks of this method is Product size precision is not high, appearance is coarse, and computing ballance correction is big and product is easy to appear shrinkage cavity shrinkage porosity, product mechanicalness at thermal center Can be general, labor efficiency is low, high expensive.

Summary of the invention

In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of low-pressure casting process of aluminum alloy impeller, institutes The draught fan impeller obtained, shape is completely clear, and dimensional accuracy is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets wind The requirement of machine.

The low-pressure casting process of aluminum alloy impeller of the present invention, comprising the following steps:

(1) overlay film sand core production method produces impeller inner cavity blade sand core;

(2) it is dried after blade sand core outer surface coating refractory coating;

(3) body mold of impeller is attached on air injection machine to working surface spray coating heat preservation after being preheated to 200~240 DEG C Adiabatic coating;

(4) body mold is put into blade sand core after being preheating to 300~400 DEG C, carries out low pressure casting, it is solidifying that molten aluminum enters type chamber Gu aluminum alloy impeller is obtained after;

Wherein, overlay film sand core production method described in step (1), using the thermosetting phenolic resin overlay film of 40~70 mesh Sand, gas forming amount≤10mL/g, room temperature bending strength >=3MPa, hot bending strength >=3MPa.

Preferably, the body mold of impeller is attached on air injection machine to working surface after being preheated to 230 DEG C in step (3) Spray coating heat preservation adiabatic coating.

Preferably, fireproof coating described in step (2) is water base corundum coatings.

Preferably, drying described in step (2) uses heated air circulation type drying oven, and drying temperature is 100~130 DEG C, It is preferred that 120 DEG C, drying time is 80~120 minutes, preferably 90 minutes.

Preferably, it is the water base of major ingredient that heat preservation adiabatic coating described in step (3), which is talcum powder, mica and titanium dioxide, Coating.

Preferably, molten aluminum described in step (4) be alusil alloy, preferably the trade mark be A356 alusil alloy, molten aluminum into The temperature for entering type chamber is 685 ± 5 DEG C.

Running gate system, heating system, cooling and pumped vacuum systems, exhaust system and top are provided in the body mold System out.

Compared with prior art, beneficial effects of the present invention are as follows:

The impeller of the low-pressure casting process preparation of aluminum alloy impeller provided by the invention, shape is completely clear, size essence Degree is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets the requirement of blower.

Specific embodiment

Below with reference to embodiment, the present invention is further illustrated.

Embodiment 1

A kind of Multi-stage centrifugal fan impeller, overall size are diameter 650mm, total height 260mm, average wall thickness 6mm, leaf Piece wall thickness 3mm, piece weight 22kg.It is required that the casting of impeller outer surface is smooth, dimensional accuracy CT8 grades is cast, computing ballance correction ≤ 100g, dense internal organization, no shrinkage cavity and porosity, slag inclusion, crackle.

It prepares this impeller and uses aluminum alloy impeller low-pressure casting process of the present invention, comprising the following steps:

(1) overlay film sand core production method is utilized, using gas forming amount≤10mL/g, room temperature bending strength >=3MPa, hot bending resistance Intensity >=3MPa, the thermosetting phenolic resin precoated sand of 40~70 mesh produce impeller inner cavity blade sand core;

(2) blade sand core outer surface uses heated air circulation type drying oven after coating water base corundum coatings, dries 90 at 120 DEG C Minute;

(3) body mold of impeller is attached on air injection machine to working surface after being preheated to 230 DEG C and sprays talcum powder, cloud Female and titanium dioxide is the water based paint of major ingredient;

(4) body mold is put into blade sand core after being preheating to 350 DEG C, carries out low pressure casting, and the aluminium silicon that the trade mark is A356 closes Golden molten aluminum obtains aluminum alloy impeller after entering the solidification of type chamber controlled at 685 ± 5 DEG C.

Running gate system, heating system, cooling and pumped vacuum systems, exhaust system and ejection system are provided in body mold System.

The aluminum alloy impeller prepared using above-mentioned technique, integrated yield reach 98%, resulting draught fan impeller, and shape is complete Whole clear, dimensional accuracy is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets the requirements.

Embodiment 2

A kind of Multi-stage centrifugal fan impeller, overall size are diameter 800mm, total height 260mm, average wall thickness 6mm, leaf Piece wall thickness 3mm, piece weight 28kg.It is required that the casting of impeller outer surface is smooth, dimensional accuracy CT8 grades is cast, computing ballance correction ≤ 100g, dense internal organization, no shrinkage cavity and porosity, slag inclusion, crackle.

It prepares this impeller and uses aluminum alloy impeller low-pressure casting process of the present invention, comprising the following steps:

(1) overlay film sand core production method is utilized, using gas forming amount≤10mL/g, room temperature bending strength >=3MPa, hot bending resistance Intensity >=3MPa, the thermosetting phenolic resin precoated sand of 40~70 mesh produce impeller inner cavity blade sand core;

(2) blade sand core outer surface uses heated air circulation type drying oven after coating water base corundum coatings, dries 90 at 120 DEG C Minute;

(3) body mold of impeller is attached on air injection machine to working surface after being preheated to 230 DEG C and sprays talcum powder, cloud Female and titanium dioxide is the water based paint of major ingredient;

(4) body mold is put into blade sand core after being preheating to 350 DEG C, carries out low pressure casting, and the aluminium silicon that the trade mark is A356 closes Golden molten aluminum obtains aluminum alloy impeller after entering the solidification of type chamber controlled at 685 ± 5 DEG C.

Running gate system, heating system, cooling and pumped vacuum systems, exhaust system and ejection system are provided in body mold System.

The aluminum alloy impeller prepared using above-mentioned technique, integrated yield reach 97%, resulting draught fan impeller, and shape is complete Whole clear, dimensional accuracy is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets the requirements.

Embodiment 3

Cooling impeller in a kind of industrial motor, overall size are diameter 500mm, total height 400mm, average wall thickness 8mm, Blade wall thickness 7mm, piece weight 25kg.It is required that the casting of impeller outer surface is smooth, dimensional accuracy CT8 grades is cast, dynamic balancing Amount≤80g, dense internal organization, no shrinkage cavity and porosity, slag inclusion, crackle.

It prepares this impeller and uses aluminum alloy impeller low-pressure casting process of the present invention, comprising the following steps:

(1) overlay film sand core production method is utilized, using gas forming amount≤10mL/g, room temperature bending strength >=3MPa, hot bending resistance Intensity >=3MPa, the thermosetting phenolic resin precoated sand of 40~70 mesh produce impeller inner cavity blade sand core;

(2) blade sand core outer surface uses heated air circulation type drying oven after coating water base corundum coatings, dries 90 at 120 DEG C Minute;

(3) body mold of impeller is attached on air injection machine to working surface after being preheated to 230 DEG C and sprays talcum powder, cloud Female and titanium dioxide is the water based paint of major ingredient;

(4) body mold is put into blade sand core after being preheating to 350 DEG C, carries out low pressure casting, and the aluminium silicon that the trade mark is A356 closes Golden molten aluminum obtains aluminum alloy impeller after entering the solidification of type chamber controlled at 685 ± 5 DEG C.

Running gate system, heating system, cooling and pumped vacuum systems, exhaust system and ejection system are provided in body mold System.

The aluminum alloy impeller prepared using above-mentioned technique, integrated yield reach 99%, resulting draught fan impeller, and shape is complete Whole clear, dimensional accuracy is high, and no casting flaw, dynamic balance performance is good, and quality is stablized, and meets the requirements.

Certainly, above content is only presently preferred embodiments of the present invention, be should not be construed as limiting to implementation of the invention Example range.The present invention is also not limited to the example above, and those skilled in the art are in essential scope of the invention Interior made all the changes and improvements etc., should all belong in patent covering scope of the invention.

Claims (6)

1. a kind of low-pressure casting process of aluminum alloy impeller, it is characterised in that: the following steps are included:
(1) overlay film sand core production method produces impeller inner cavity blade sand core;
(2) it is dried after blade sand core outer surface coating refractory coating;
(3) body mold of impeller is attached on air injection machine to working surface spray coating heat preservation after being preheated to 200~240 DEG C to be insulated Coating;
(4) body mold is put into blade sand core after being preheating to 300~400 DEG C, low pressure casting is carried out, after molten aluminum enters the solidification of type chamber Obtain aluminum alloy impeller;
Wherein, overlay film sand core production method described in step (1), using the thermosetting phenolic resin precoated sand of 40~70 mesh, hair Tolerance≤10mL/g, room temperature bending strength >=3MPa, hot bending strength >=3MPa.
2. the low-pressure casting process of aluminum alloy impeller according to claim 1, it is characterised in that: described in step (2) Fireproof coating is water base corundum coatings.
3. the low-pressure casting process of aluminum alloy impeller according to claim 1, it is characterised in that: described in step (2) Drying uses heated air circulation type drying oven, and drying temperature is 100~130 DEG C, and drying time is 80~120 minutes.
4. the low-pressure casting process of aluminum alloy impeller according to claim 1, it is characterised in that: described in step (3) Heat preservation adiabatic coating is the water based paint that talcum powder, mica and titanium dioxide are major ingredient.
5. the low-pressure casting process of aluminum alloy impeller according to claim 1, it is characterised in that: described in step (4) Molten aluminum is alusil alloy, and the temperature that molten aluminum enters type chamber is 685 ± 50 DEG C.
6. the low-pressure casting process of aluminum alloy impeller according to claim 1, it is characterised in that: in the body mold It is provided with running gate system, heating system, cooling and pumped vacuum systems, exhaust system and ejection system.
CN201910249547.8A 2019-03-29 2019-03-29 The low-pressure casting process of aluminum alloy impeller CN109773160A (en)

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Publication number Priority date Publication date Assignee Title
CN110180998A (en) * 2019-06-24 2019-08-30 山东鸿源新材料有限公司 The production technology of aluminium alloy air inlet pipe

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CN105798262A (en) * 2016-03-26 2016-07-27 山东鸿源新材料有限公司 Production process for integrated type water-cooled motor shell of new energy automobile
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CN110180998A (en) * 2019-06-24 2019-08-30 山东鸿源新材料有限公司 The production technology of aluminium alloy air inlet pipe

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