CN207508216U - A kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust - Google Patents
A kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust Download PDFInfo
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- CN207508216U CN207508216U CN201721696007.7U CN201721696007U CN207508216U CN 207508216 U CN207508216 U CN 207508216U CN 201721696007 U CN201721696007 U CN 201721696007U CN 207508216 U CN207508216 U CN 207508216U
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- sand
- cavity
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- mold
- casting mold
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Abstract
The utility model discloses a kind of tidal stencils sand for exempting to spray no cavity exhaust to cast casting mold, including outer sand mold and sand core, the sand core is placed in the cavity (3), outer sand mold top case made of molding sand and moulding box (1) and drag box (2) mould assembling are formed, the top case (1) has sprue gate (7), the inside of the outer sand mold with casting outer profile with being adapted and in pouring molten iron as confined space and the cavity with pressure (3), the cavity (3) is exhausted by the hole that molding sand (5) has, the sprue gate (7) connects with cavity (3), control cavity (3) interior air pressure is in plateau, it avoids being involved in gas, stablize molten iron and fill type.
Description
Technical field
The utility model is related to tidal stencils sand to cast casting mold, more particularly to a kind of tidal stencils sand casting for exempting to spray no cavity exhaust
Casting mold.
Background technology
With the continuous development of foundry engieering, casting cost requirement constantly declines, it is desirable that by the way of technique cost declining
Also it is increasingly difficult to, under the quality requirement for keeping present product, needs to change traditional casting technique and casting method
The change of property.In existing much tidal stencils sand casting techniques, in order to reduce the probability of the scab of product, using spray usually on casting mold
The mode of coating prevents penetration.But spray paint prevents the method for casting penetration that there is also a side effects, applies
After material is sprayed, one layer of fine and close dope layer can be formed on mo(U)ld face, this can destroy original sand mold green permeability, no
The gas discharge of casting mold cavity after type is filled conducive to molten iron.In this case, often in process using increase cavity gas vent
Mode solve the exhaust of casting mold cavity, i.e., the cavity exhaust needle that several are connected with cavity is set on casting mold (such as Fig. 1 institutes
Show).Although traditional tidal stencils sand casting can preferably solve the exhausting problem of penetration and casting mold cavity, but exist
Following shortcoming：
1. molding sand adds in the old sand of sieving dust removal using the fresh sand (50-100 mesh) that gas permeability is higher and mesh number is thicker, then presses
Certain ratio adds in the tidal stencils sand that bentonite, coal dust, starch additive and suitable quantity of water are blended, it is desirable that molding sand it is penetrable ventilated
Property be more than 120.
2. the casting mold used at present includes outer sand mold and sand core, the inside of outer sand mold has the type identical with casting outer profile
Chamber 3, sand core are placed in the cavity 3, and outer sand mold top case 1 and 2 mould assembling of drag box made of molding sand 5 and moulding box are formed, on
Molding box 1, which has to connect with cavity 3, pours mouth and several exhaust needles 4, this is needed when process mould designs, and is set on process mould
It puts with cavity exhaust needle 4.4 main function of cavity exhaust needle of casting mold is：In the cavity that casting mold is discharged during molten iron casting
Gas.But after casting mold is completely filled with molten iron, molten iron will continue to the full whole exhaust needle of filling, so as to increase making for molten iron
Dosage increases production cost.
3. after casting mold completes, a coating is sprayed in mo(U)ld face, the penetration of casting can be effectively prevent, but
The green permeability of casting mold can be caused to substantially reduce simultaneously.
4. the exhaust of casting mold is improved, and casting mold partial pressure can be caused relatively low by the way of brill cavity gas vent is added,
The flowing velocity of local molten iron is changed, causes local molten iron flow speed inconsistent, molten iron fills type turbulent flow, and molten iron is involved in gas
Body increases the Probability of bleb.
Utility model content
The purpose of this utility model is to provide a kind of tidal stencils sand for exempting to spray no cavity exhaust to cast casting mold.Casting mold profit
It is exhausted with the green permeability of molding sand, air pressure is steady, is conducive to the Stable Filling of molten iron, non-involvement gas, stable prod matter
Amount.
The purpose of this utility model realizes that a kind of tidal stencils sand for exempting to spray no cavity exhaust is cast by following technical measures
Make casting mold, including outer sand mold and sand core, the sand core is placed in the cavity, the outer sand mold made of the molding sand and moulding box on
Molding box and drag box mould assembling are formed, and the top case has sprue gate, and the inside of the outer sand mold has and casting outer profile
Be adapted and in pouring molten iron as confined space and with pressure cavity, the hole that the cavity has by molding sand
It is exhausted, the sprue gate is connected with cavity.
The molding sand is matched to be made of following materials in percentage by mass：Fresh sand 5-10%, old sand 85-90%, bentonite
0.5-3%, coal dust 0.5-3%, starch additive 0.1-0.5%, appropriate amount of water, the molding sand green permeability 60-80 of gained.This practicality
The water content of novel Sand is controlled in the range of 2.9-3.1%.
In step (3) described in the utility model, the cavity hardness of casting mold is more than 85.
Further, if the cavity of the casting mold can set more than one with higher site on these sites
The collection gas bag of 20-30mm high increases the space for accommodating gas, when pouring, has the position of collection gas bag because air pressure is relatively low, greatly
Portion gas can flow to collection gas bag and stop, so as to maintenance intracavitary air pressure.
The utility model has the following advantages：
1. casting mold cavity prepared by the utility model does not have gas vent so that casting mold is have certain air pressure closed
Cavity.In mould assembling cast, when molten iron fills type, casting mold, which forms one, die mould chamber, merely with the green permeability discharge type of molding sand
Gas in chamber, and molten iron is exhausted under the conditions of low-permeable and without the gas vent of perforation using the green permeability of molding sand,
Air pressure is steady, is conducive to the Stable Filling of molten iron, non-involvement gas, stabilized product quality.
3. the utility model sets collection gas bag to increase the space of receiving gas in cavity high bit point, when pouring, have
There is the position of collection gas bag because air pressure is relatively low, most of gas can flow to collection gas bag and stop, so as to maintenance intracavitary air pressure.
Description of the drawings
Fig. 1 is the existing casting mold sectional view with cavity exhaust needle.
Fig. 2 is the casting mold sectional view of the utility model embodiment 1.
Fig. 3 is the vertical view of the casting mold of the utility model embodiment 1.
Fig. 4 is the casting mold sectional view of the utility model embodiment 2-4.
Specific embodiment
The utility model is described in further detail with reference to specific embodiment, but is not formed to the utility model
Any restrictions, any limited modification made in the range of the utility model claims, still in the right of the utility model
In claimed range.
Embodiment 1
Casting mold shown in Fig. 2-3 is one embodiment of the utility model, (is not shown in figure including outer sand mold and sand core
Go out), the inside of outer sand mold has the cavity 3 identical with casting outer profile, and sand core is placed in cavity 3.Outer sand mold is by molding sand 5 and mould
Top case 1 made of case and 2 mould assembling of drag box are formed, and cavity 3 is arranged in top case 1.Top case 1 has sprue gate 7.This is poured
Geat 7 is connected with cavity 3, and when from sprue gate pouring molten iron into cavity 3, molten iron has blocked sprue gate 7, becomes cavity 3
Confined space simultaneously has certain pressure, is exhausted merely with the green permeability of molding sand 5, and air pressure in cavity 3 can control to be in flat
Steady state avoids being involved in gas.
Molding sand 5 is made of following materials in percentage by mass：Fresh sand 5-10%, old sand 85-90%, bentonite 0.5-3%, coal
Powder 0.5-3%, starch additive 0.1-0.5%, water 2.9-3.1%, the molding sand green permeability 60-80 of gained.The cavity of casting mold
Hardness is more than 85.
Embodiment 2
As different from Example 1：As shown in figure 4, the collection gas bag of setting 20mm high in site higher in casting mold cavity 3
6, collection gas bag 6 is opening down and equipped with gas collection piece 8.
Embodiment 3
As different from Example 2：The collection gas bag 6 of higher site setting 25mm high in casting mold cavity 3.
Embodiment 4
As different from Example 2：The collection gas bag 6 of higher site setting 30mm high in casting mold cavity 3.
Claims (4)
1. a kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust, including outer sand mold and sand core, the sand core is placed in described
In cavity (3), the outer sand mold top case (1) and drag box (2) mould assembling composition made of molding sand (5) and moulding box, it is described on
Molding box (1) has sprue gate (7), it is characterized in that, the inside of the outer sand mold, which has, to be adapted and is being poured with casting outer profile
Note molten iron when as confined space and with pressure cavity (3), the cavity (3) by the hole that molding sand (5) has into
Row exhaust, the sprue gate (7) connect with cavity (3).
2. the tidal stencils sand casting casting mold according to claim 1 for exempting to spray no cavity exhaust, it is characterized in that, the casting mold
The collection gas bag (6) of more than one 20-30mm high is set on the high bit point of cavity (3), the collection gas bag (6) it is opening down and with
Cavity connects.
3. the tidal stencils sand casting casting mold according to claim 2 for exempting to spray no cavity exhaust, it is characterized in that, the collection gas bag
(6) opening setting gas collection piece (8).
4. the tidal stencils sand casting casting mold as claimed in any of claims 1 to 3 for exempting to spray no cavity exhaust, feature
It is that the green permeability of the molding sand (5) is 60-80.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696007.7U CN207508216U (en) | 2017-12-08 | 2017-12-08 | A kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696007.7U CN207508216U (en) | 2017-12-08 | 2017-12-08 | A kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207508216U true CN207508216U (en) | 2018-06-19 |
Family
ID=62543359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721696007.7U Expired - Fee Related CN207508216U (en) | 2017-12-08 | 2017-12-08 | A kind of tidal stencils sand casting casting mold for exempting to spray no cavity exhaust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207508216U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812886A (en) * | 2017-12-08 | 2018-03-20 | 广西玉柴机器股份有限公司 | It is a kind of to exempt from tidal stencils sand casting technique and casting mold of the spraying without die cavity exhaust |
-
2017
- 2017-12-08 CN CN201721696007.7U patent/CN207508216U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812886A (en) * | 2017-12-08 | 2018-03-20 | 广西玉柴机器股份有限公司 | It is a kind of to exempt from tidal stencils sand casting technique and casting mold of the spraying without die cavity exhaust |
| CN107812886B (en) * | 2017-12-08 | 2023-09-19 | 广西玉柴机器股份有限公司 | Spraying-free tidal sand casting process without cavity exhaust and casting mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180619 Termination date: 20211208 |