CN102489672A - Metal mold casting method for aluminum alloy castings - Google Patents
Metal mold casting method for aluminum alloy castings Download PDFInfo
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- CN102489672A CN102489672A CN2011104211421A CN201110421142A CN102489672A CN 102489672 A CN102489672 A CN 102489672A CN 2011104211421 A CN2011104211421 A CN 2011104211421A CN 201110421142 A CN201110421142 A CN 201110421142A CN 102489672 A CN102489672 A CN 102489672A
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Abstract
A metal mold casting method for aluminum alloy castings belongs to the technical field of metal casting for aluminum alloy castings with internal sand cores and includes the steps: firstly, taking the sand cores out of hot core box molds, brushing quick-drying aluminum powder paint at hot spots of the castings corresponding to the sand cores, and placing the sand cores into casting molds after the quick-drying aluminum powder paint penetrates into the surfaces of the sand cores by the thickness of at least 4-5mm (the specific thickness is properly increased when shrinkage of the castings is serious, and is properly decreased when shrinkage of the castings is slight); secondly, pouring high-temperature molten aluminum into the casting molds and taking aluminum alloy casting blanks out of the molds after the molten aluminum is solidified; and finally, vibrating the aluminum alloy casting blanks and pouring the sand cores out of the aluminum alloy casting blanks to obtain the aluminum alloy castings. The metal mold casting method for the aluminum alloy castings is capable of efficiently solving the problem of shrinkage of the hot spots of the aluminum alloy castings, and is convenient in operation, low in cost, wide in applicability, high in production efficiency and capable of realizing mass production.
Description
Technical field
The present invention relates to adopt the technical field that core is arranged in the metal casting, relate to a kind of metal mould cast method of aluminium alloy castings specifically.
Background technology
The metal mould cast method of existing aluminium alloy castings is in the hot box mould, to process core earlier, and core is that the moulding of Birmasil core cavity is used; Then this core is positioned in the casting mould of foundry goods, cast high temperature aluminum liquid in casting mould in the casting die die cavity, be full of high temperature aluminum liquid, and high temperature aluminum liquid wraps core then; When aluminium liquid cools off formation aluminium alloy castings blank in casting die after, with the casting die die sinking, take out the aluminium alloy castings blank, will be positioned at the inner core of aluminium alloy castings blank again and pour out through vibration, this moment, aluminium alloy castings formed.
But owing to the design of part reason of processing, many aluminium alloy castingses like water pump, ring flange etc., exist the long and narrow thermal center of ring seal in the junction of different wall.Thermal center is meant in casting solidification process, metal freezing node or zone slowly around the foundry goods internal ratio.Behind the casting solidification, be prone to form dispersed shrinkage porosite, shrinkage cavity defect at the thermal center place.
The above-mentioned shrinkage porosite of present solution, the process that shrinkage cavity defect is commonly used have riser feeding method and thermal center place to add two kinds of methods of chill.The advantage of riser feeding method is effective to the feeding of concentrating thermal center, owing to receive the restriction of feeding distance and feeding channel wall thickness, this technology is disperseed the feeding weak effect of thermal center to the uneven aluminium alloy castings of Thickness Distribution.Some local locations can't increase feeding head; Can only be through changing the design of foundry goods drawing, increasing the problem that the feeding passage method solves the feeding deficiency; So both change the requirement of drawing of rough casting paper size, increased aluminium liquid use amount again, caused the dissatisfied raising with casting cost of client.
And add chill at foundry goods thermal center place; Its method is that directly corresponding core outer surface adds chill at foundry goods thermal center place, high temperature aluminum liquid and chill are met after, owing to the two temperature difference is very big; Chill will absorb heat from the foundry goods thermal center; Accelerate the cooling velocity at thermal center place in the foundry goods cooling procedure, reduce the setting time of thermal center, can solve shrinkage porosite, the shrinkage cavity defect at thermal center place very effectively.But this explained hereafter efficient is very low, because the manufacturing process of chill is strict complicated, recovery process is loaded down with trivial details; Each foundry goods adds all will add chill man-hour, and the foundry goods of different size needs the chill of different size, the foundry goods of production in enormous quantities; The chill demand is big, and will operate by manual work entirely, has not only improved production cost; And difficulty of processing is big, and production efficiency is low, and the casting export design that has is little; Chill is taken off very difficulty from foundry goods, and these all make the working (machining) efficiency of foundry goods reduce inconvenient operation.
Summary of the invention
The metal mould cast method that the purpose of this invention is to provide a kind of aluminium alloy castings, it can efficiently solve shrinkage porosite, the shrinkage cavity problem of aluminium alloy castings thermal center, and it is easy to operate, cost is low, applicability is wide, can form production in enormous quantities and production efficiency is high.
In order to realize such scheme, technical solution of the present invention is: a kind of metal mould cast method of aluminium alloy castings, it comprises the steps:
(1) with core from the hot box mould, process take out after, be positioned over core in the casting mould during casting;
(2) high temperature aluminum liquid is cast in the casting mould, treats after setting time is accomplished the aluminium alloy castings blank to be taken out from mould;
(3) vibration aluminium alloy castings blank is poured out core from the aluminium alloy castings blank, promptly obtains aluminium alloy castings;
Wherein before core is positioned over casting mould, brushing rapid-curing cutback aluminium paint on corresponding high temperature sand core position, foundry goods thermal center place treats that the rapid-curing cutback aluminium paint penetrates into the core surface at least behind the 4-5mm, is positioned over core in the casting mould.
The metal mould cast method of aluminium alloy castings of the present invention; Wherein in the step (1), after core processes from the hot box mould, when temperature is reduced to 120 ℃ to 180 ℃; The rapid-curing cutback aluminium paint is brushed on the corresponding core position, aluminium alloy castings thermal center position, and the brushing number of times is at least twice.
The metal mould cast method of aluminium alloy castings of the present invention, wherein in the step (1), said core, is positioned in the casting mould after 24 hours at brushing rapid-curing cutback aluminium paint.
After adopting such scheme, the metal mould cast method of aluminium alloy castings of the present invention makes most of rapid-curing cutback aluminium paint penetrate into the core surface through with brushing multipass rapid-curing cutback aluminium paint on the corresponding site of the high temperature core that processes in the hot box mould; After high temperature aluminum liquid was injected casting mould, high temperature aluminum liquid wrapped core and forms hot aluminium alloy castings blank, is brushed with the rapid-curing cutback aluminium paint owing to being coated with at corresponding core position, the thermal center position of foundry goods; These thermal center positions are when solidifying; Keep identical, thereby can not produce shrinkage porosite, shrinkage cavity, efficiently solved shrinkage porosite, the shrinkage cavity problem at aluminium alloy castings thermal center place with the cooled and solidified speed of other position metal on every side; And at core outer surface brushing rapid-curing cutback aluminium paint; Its cost is low, easy to operate fast, add chill more than the core outer surface and want simple many, and it is applicable to the processing of multiple foundry goods; Can form production in enormous quantities, production efficiency is high.
Description of drawings
Fig. 1 is the water pump casting structure sketch map with the metal mould cast method processing of aluminium alloy castings of the present invention;
Fig. 2 is the sand core structure sketch map of the water pump of processing.
The specific embodiment
As shown in Figure 1, be the automobile water-based pump foundry goods that the metal mould cast method processing with aluminium alloy castings of the present invention makes, this water pump foundry goods comprises bend pipe 1, the cavity 2 of bend pipe 1 is to make through the crooked bar-shaped core 3 among Fig. 2.Its manufacturing process comprises the steps:
(1) through hot box process processing core 3, the temperature that core 3 takes out from the hot box mould is between 200 ℃-220 ℃, when treating that its temperature drops to 120 ℃-180 ℃; The rapid-curing cutback aluminium paint is brushed on the corresponding site 4 of core 3, this corresponding site is the corresponding position of bend pipe 1 inner chamber thermal center of water pump foundry goods, and its brushing number of times is at least twice; Treat that the rapid-curing cutback aluminium paint penetrates into core 3 surfaces and gets final product behind the 4-5mm at least; If not enough, the overbrushing brush is several times again, after 24 hours that brushing finishes; Core 3 is positioned in the counterdie die cavity of permanent mold casting mould; Wherein the rapid-curing cutback aluminium paint can directly buy on market, and its main component is metal dust and blue or green lacquer, and it has major functions such as heatproof, fast drying, strong adhesion;
The core that (2) will be brushed with aluminium paint is placed in the counterdie of casting mould,, afterwards high temperature aluminum liquid is poured in the casting mould the upper die and lower die matched moulds through the hydraulic pressure casting machine, treats that the casting mould inner chamber forms the aluminium alloy castings blank that is enclosed with core 3;
(3) setting time through configuring on the hydraulic pressure casting machine, the upper die and lower die die sinking of control casting mould, the aluminium alloy castings blank is taken out in manual work afterwards;
(4) vibration aluminium alloy castings blank is poured out core 3 from the aluminium alloy castings blank, promptly obtains aluminium alloy castings.
The metal mould cast method of aluminium alloy castings of the present invention is through brushing multipass rapid-curing cutback aluminium paint on the corresponding site 4 of high temperature core 3; Make the rapid-curing cutback aluminium paint fully be penetrated into the surface of core 3, make that the rapid-curing cutback aluminium paint can cool off the high temperature aluminum liquid that contacts with it fast with after high temperature aluminium alloys liquid contacts; Thereby make thermal center position in the bend pipe 1 of water pump foundry goods when solidifying; Keep consistent, thereby can not produce shrinkage porosite, shrinkage cavity, solve shrinkage porosite, the shrinkage cavity problem at water pump foundry goods thermal center place efficiently at the thermal center place of bend pipe 1 with the cooled and solidified speed of other position metal on every side; And at core 3 outer surface corresponding sites 4 brushing rapid-curing cutback aluminium paints; At first the cost of rapid-curing cutback aluminium paint is low, secondly brushing rapid-curing cutback aluminium paint is easy to operate fast, wants simple many more than add chill at core 3 outer surfaces, goes for the processing of multiple aluminium alloy castings with this method; And can form production in enormous quantities, production efficiency is high.
The above embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (3)
1. the metal mould cast method of an aluminium alloy castings, it comprises the steps:
(1) with core from the hot box mould, process take out after, be positioned over core in the casting mould during casting;
(2) high temperature aluminum liquid is cast in the casting mould, treats after setting time is accomplished the aluminium alloy castings blank to be taken out from mould;
(3) vibration aluminium alloy castings blank is poured out core from the aluminium alloy castings blank, promptly obtains aluminium alloy castings;
It is characterized in that: before core was positioned over casting mould, brushing rapid-curing cutback aluminium paint on corresponding high temperature sand core position, foundry goods thermal center place treated that the rapid-curing cutback aluminium paint penetrates into the core surface at least behind the 4-5mm, is positioned over core in the casting mould.
2. the metal mould cast method of aluminium alloy castings as claimed in claim 1; It is characterized in that: in the step (1); After core processes from the hot box mould; When temperature is reduced to 120 ℃ to 180 ℃, the rapid-curing cutback aluminium paint is brushed on the corresponding core position, aluminium alloy castings thermal center position, and the brushing number of times is at least twice.
3. according to claim 1 or claim 2 the metal mould cast method of aluminium alloy castings, it is characterized in that: in the step (1), said core, is positioned in the casting mould after 24 hours at brushing rapid-curing cutback aluminium paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104211421A CN102489672A (en) | 2011-12-15 | 2011-12-15 | Metal mold casting method for aluminum alloy castings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104211421A CN102489672A (en) | 2011-12-15 | 2011-12-15 | Metal mold casting method for aluminum alloy castings |
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| CN102489672A true CN102489672A (en) | 2012-06-13 |
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| CN2011104211421A Pending CN102489672A (en) | 2011-12-15 | 2011-12-15 | Metal mold casting method for aluminum alloy castings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148584A (en) * | 2014-08-20 | 2014-11-19 | 无锡柯马机械有限公司 | Method for casting metal mold |
| CN105618673A (en) * | 2014-11-11 | 2016-06-01 | 泰州市金鹰精密铸造有限公司 | Precise casting method of aluminum alloy die casting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058028A (en) * | 1991-07-01 | 1993-01-19 | Aisin Takaoka Ltd | Aluminum casting plant |
-
2011
- 2011-12-15 CN CN2011104211421A patent/CN102489672A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058028A (en) * | 1991-07-01 | 1993-01-19 | Aisin Takaoka Ltd | Aluminum casting plant |
Non-Patent Citations (3)
| Title |
|---|
| 汪煦等: "金属型铸造摩托车铝合金轮毂凝固过程数值模拟", 《特种铸造及有色合金》 * |
| 王重厚: "铝合金进气歧管铸件的金属型铸造", 《特种铸造及有色合金》 * |
| 谢秀真: "发动机铝合金缸盖的低压铸造模具设计及工艺验证", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148584A (en) * | 2014-08-20 | 2014-11-19 | 无锡柯马机械有限公司 | Method for casting metal mold |
| CN105618673A (en) * | 2014-11-11 | 2016-06-01 | 泰州市金鹰精密铸造有限公司 | Precise casting method of aluminum alloy die casting |
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Application publication date: 20120613 |