CN202479476U - Air-exhausting structure for low-pressure casting filling of sand mould - Google Patents
Air-exhausting structure for low-pressure casting filling of sand mould Download PDFInfo
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- CN202479476U CN202479476U CN2012200846384U CN201220084638U CN202479476U CN 202479476 U CN202479476 U CN 202479476U CN 2012200846384 U CN2012200846384 U CN 2012200846384U CN 201220084638 U CN201220084638 U CN 201220084638U CN 202479476 U CN202479476 U CN 202479476U
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- air
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- sand mold
- filling
- deep hole
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Abstract
The utility model relates to an air-exhausting structure for the low-pressure casting filling of a sand mould, comprising the sand mould. The air-exhausting structure is characterized in that the top of the sand mould is provided with an air-exhausting passageway communicating the top end of a sand mould cavity with the external, wherein the air-exhausting passageway consists of an upper shallow hole and a lower deep hole, which are sequentially arranged from top to bottom, the lower end of the deep hole is communicated with the sand mould cavity, the upper end of the deep hole is communicated with the lower end of the shallow hole, and the upper end of the shallow hole is communicated with the external; and the diameter of the shallow hole is smaller than that of the deep hole. When filling is carried out by the sand mould which adopts the air-exhausting structure, stable air exhausting in the process of filling can be realized, and the pressuring and pressure-keeping crystallization can be conveniently realized by quickly closing the cavity after filling. The filling time and speed and the aluminum liquid amount can be mastered by observing the overflowing time, the pressuring and pressure-keeping time point can be ensured as well after the cavity is sealed, and the reliable guarantee can be provided for improving the product quality. Furthermore, the height of the box-covering sand mould can be effectively reduced, the sand use level for covering the box can be greatly reduced, and the cost can be saved.
Description
Technical field
The utility model relates to a kind of casting sand type, and particularly a kind of sand mold low pressure casting fills the type exhaust structure.
Background technology
The sand mold low pressure casting is to utilize compressed gas steadily to be pressed onto the process in the sand mold to the aluminium liquid of the process refining treatment in the crucible through stalk.It has the following advantages: it is more steady that liquid metals fills type; Casting forming property is good, helps forming the foundry goods of clear-cut, any surface finish, and is more favourable for the shaping of large thin wall casting; Foundry goods dense structure, mechanical performance is high; Improved the technology recovery rate of molten metal.In addition, working condition is good; Equipment is simple, is prone to realize mechanization and automation.
Aluminium casting in the sand mold low pressure casting is when filling type; The temperature of sand mold is usually between 80-150 ℃; Temperature of aluminum liquid is between 700 ~ 750 ℃, and both temperature difference are bigger, very easy frozen solidifying when (the thin-walled shells product of special big part) aluminium liquid flows at die cavity in filling process; Can't realize directional solidification, thereby regular hour and filling velocity requirement must be arranged.But when be full of die cavity owing to can't observe aluminium liquid, time, speed and the aluminium liquid measure of therefore filling type are difficult to grasp, and also are difficult to confirm for the supercharging after the die cavity sealing, dwell time.Often take place owing to control is difficult for producing product rejection even produces security incident, this process has also restricted the technical bottleneck that the low pressure casting technology can not be produced large-scale aluminium casting.
For this reason; Existing process is in order to solve above-mentioned technical bottleneck, and is as shown in Figure 1, in the technological design of sand mold low pressure casting; In the top box of top, increase the height of sand mold, and the rising head 5 (height of 400mm ~ 600mm usually) of very high length is set in the sand mold 6 of this top box.Observe the cavity filling process of control aluminium liquid and be used for feeding through this rising head 5.Because this rising head 5 should be convenient to observation, meets the requirement of feeding again, its diameter must be greater than 6 ~ 15 times of the wall thickness of product.The increasing of rising head diameter makes this need solidify the passage that freezes near closed hollow ring as early as possible and is difficult for sealing.Therefore this kind technology only just utilizes low pressure to fill type, belongs to low pressure and fills type technology, can't adopt the crystallization supercharging.Make low pressure casting particularly the technology of the low pressure casting of sand mold received very big restriction.
Summary of the invention
The technical problem that the utility model will solve provides a kind of sand mold low pressure casting and fills the type exhaust structure, can be when low pressure be filled type with die cavity in gas steadily discharge, and can after aluminium liquid is full of die cavity, overflow and close rapidly die cavity and realize boosting the pressurize crystallization.
For solving the problems of the technologies described above; The technical scheme of the utility model is: a kind of sand mold low pressure casting fills the type exhaust structure; Comprise sand mold, its innovative point is: the top of said sand mold is provided with and is communicated with sand mold die cavity top and extraneous exhaust passage, and said exhaust passage is by setting gradually from top to bottom and the shallow bore hole and the deep hole of mutual conduction are formed; The lower end of said deep hole and the conducting of sand mold die cavity, said shallow bore hole upper end and extraneous conducting; And said shallow bore hole diameter is less than the deep hole diameter.
Further, said deep hole diameter is Φ 5-Φ 8mm, and said shallow bore hole diameter is Φ 2 ~ Φ 3mm.
Further, the degree of depth of said shallow bore hole is at 2-6mm.
The advantage of the utility model is: when adopting the sand mold with above-mentioned air discharging structure to fill type, aluminium liquid steadily rises, and the die cavity air is discharged along deep hole, shallow bore hole; When being full of die cavity, aluminium liquid also continues to rise through the deep hole of sand mold; Because the diameter of deep hole is bigger, aluminium liquid is difficult for solidifying in uphill process, continues to rise and passes through shallow bore hole; Because the bore of shallow bore hole is less, the degree of depth is more shallow, can overflows outside the plane of sand mold and solidified rapidly.Thereby can realize smooth exhaust in the cavity filling process, fill and close die cavity rapidly after type is accomplished so that realize pressurization pressurize crystallization.And can overflow time point through observation and grasp time, speed and the aluminium liquid measure of filling type, might as well confirm that for the supercharging after the die cavity sealing, dwell time point reliable assurance is provided for improving the quality of products, and product percent of pass reaches more than 98%.In addition, effectively reduce top box sand mold height, reduced the sand using amount of top box greatly, provide cost savings to 100mm ~ 120mm.
Description of drawings
Fig. 1 fills the type structural representation for tradition band rising head low pressure.
Fig. 2 fills the structural representation of type exhaust structure for sand mold low pressure casting among the present invention.
The specific embodiment
As shown in Figure 2, comprise sand mold 1, be provided with the exhaust passage that is communicated with sand mold die cavity 11 tops and the external world at the top of sand mold 1.This exhaust passage is made up of shallow bore hole that sets gradually from top to bottom 2 and deep hole 3, and shallow bore hole 2 can be vertical with deep hole 3 boring directions, also can tilt, but shallow bore hole 2 must be positioned at sand mold 1 upper surface.The lower end of deep hole 3 and 11 conductings of sand mold die cavity, deep hole 3 upper ends and shallow bore hole 2 lower end conductings, shallow bore hole 2 upper ends and extraneous conducting, the diameter of shallow bore hole 2 is less than deep hole 3 diameters.Concrete, the deep hole diameter is Φ 5-Φ 8mm, and the shallow bore hole diameter is Φ 2 ~ Φ 3mm, and the degree of depth of shallow bore hole is at 2-6mm.
Operation principle: when sand mold 1 filled type, aluminium liquid steadily rose, and die cavity 11 air are discharged along deep hole 3, shallow bore hole 2; When being full of die cavity 11, aluminium liquid also continues to rise through the deep hole 3 of sand mold; Because the diameter of deep hole 3 is bigger, aluminium liquid is difficult for solidifying in uphill process, continues to rise through shallow bore hole 2; Because the bore of shallow bore hole 2 is less, the degree of depth is more shallow, can overflows outside the plane of sand mold 1 and solidified rapidly.
Claims (3)
1. a sand mold low pressure casting fills the type exhaust structure; Comprise sand mold; It is characterized in that: the top of said sand mold is provided with and is communicated with sand mold die cavity top and extraneous exhaust passage; Said exhaust passage is by setting gradually and the shallow bore hole and the deep hole of mutual conduction are formed the lower end of said deep hole and the conducting of sand mold die cavity, said shallow bore hole upper end and extraneous conducting from top to bottom; And said shallow bore hole diameter is less than the deep hole diameter.
2. sand mold low pressure casting according to claim 1 fills the type exhaust structure, it is characterized in that: said deep hole diameter is Φ 5-Φ 8mm, and said shallow bore hole diameter is Φ 2 ~ Φ 3mm.
3. sand mold low pressure casting according to claim 1 fills the type exhaust structure, it is characterized in that: the degree of depth of said shallow bore hole is at 2-6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200846384U CN202479476U (en) | 2012-03-08 | 2012-03-08 | Air-exhausting structure for low-pressure casting filling of sand mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200846384U CN202479476U (en) | 2012-03-08 | 2012-03-08 | Air-exhausting structure for low-pressure casting filling of sand mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202479476U true CN202479476U (en) | 2012-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200846384U Withdrawn - After Issue CN202479476U (en) | 2012-03-08 | 2012-03-08 | Air-exhausting structure for low-pressure casting filling of sand mould |
Country Status (1)
| Country | Link |
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| CN (1) | CN202479476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527995A (en) * | 2012-03-08 | 2012-07-04 | 南通爱尔思轻合金精密成型有限公司 | Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure |
-
2012
- 2012-03-08 CN CN2012200846384U patent/CN202479476U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527995A (en) * | 2012-03-08 | 2012-07-04 | 南通爱尔思轻合金精密成型有限公司 | Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121010 Effective date of abandoning: 20131023 |
|
| RGAV | Abandon patent right to avoid regrant |