CN202571241U - Die structure for reducing air holes and shrinkage holes of pressure casting - Google Patents
Die structure for reducing air holes and shrinkage holes of pressure casting Download PDFInfo
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- CN202571241U CN202571241U CN 201220091414 CN201220091414U CN202571241U CN 202571241 U CN202571241 U CN 202571241U CN 201220091414 CN201220091414 CN 201220091414 CN 201220091414 U CN201220091414 U CN 201220091414U CN 202571241 U CN202571241 U CN 202571241U
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Abstract
The utility model discloses a die structure for reducing air holes and shrinkage holes of a pressure casting, belongs to the technical field of pressure casting dies, and aims to provide a die structure which is reasonable in air exhaust structure arrangement, good in air exhaust effect and high in qualification rate of the pressure castings and is capable of reducing the air holes and the shrinkage holes of the pressure casting; moreover, by the die structure, the air holes and the shrinkage holes are hardly formed in the surface of a relatively thick part of the formed pressure casting. The die structure comprises a movable die, a fixed die, a cavity, a sprue gate, an air exhaust system and an insert, wherein the air exhaust system is arranged at the tail of the cavity of the sprue gate along the flowing direction of a metal solution and comprises an overflow slot and an air exhaust slot; a plurality of small cylindrical holes are formed in the inner wall of the fixed die at the relatively thick part of the cavity; the depth of the small cylindrical holes is smaller than the thickness of the fixed die; the small cylindrical holes are 4 to 5 mm thick and19 to 20 mm deep; and the gradient of the single edge of each small cylindrical hole is 2 to 3 degrees. The die structure is mainly used in pressure casting dies capable of reducing the air holes and the shrinkage holes in the pressure casting.
Description
Technical field
The utility model relates to a kind of die casting technical field, relates in particular to a kind of mould structure that reduces the shrinkage cavity of die casting pore.
Background technology
Die casting generally comprises cover half that the cover half installing plate that is fixed on die casting machine is, is fixed on the dynamic model on the die casting machine dynamic model installing plate, this dynamic model servo-actuated mold mounting plate relative motion and accomplish matched moulds and die sinking.During matched moulds, form die cavity between cover half and the dynamic model, liquid metals under high pressure is full of this die cavity, and during die sinking, dynamic model separates with cover half, just can foundry goods be taken out.Die casting is a kind of with air in the liquid metals displacement chamber, and air is discharged to the mould outside through the exhaust structure on the die casting in the chamber.Exhaust structure is to the outward appearance of foundry goods, and particularly the quality of foundry goods inside and the adjusting range of casting process have significant impact.
Chinese patent Granted publication CN 200988097Y, open day is on December 12nd, 2007, name is called in the scheme of " structure of cast die " and discloses a kind of structure of cast die.It comprises that two are separated by and the foot pad established, and a plummer is formed respectively on the bottom of the opposite side of two foots pad; Stride between two plummers and establish liftout plate; The top of this time liftout plate is provided with a upper ejector plate; And two foots pad are provided with a male model; This male model is provided with a master mold.Weak point is that the exhaust structure of this structure of cast die is provided with unreasonable, has exhaust problem, is prone to produce increased number of stomata and shrinkage cavity on the surface at the thicker position of moulding die casting, at the bottom of the die casting qualification rate.
The utility model content
The utility model is that to exist exhaust structure to be provided with in the existing structure of cast die unreasonable in order to solve; Exhaust effect is poor, be prone to produce increased number of stomata and shrinkage cavity on the surface at the thicker position of moulding die casting; These deficiencies at the bottom of the die casting qualification rate; Provide a kind of exhaust structure to be provided with rationally, good exhaust effect, difficult pore and shrinkage cavity, a kind of mould structure that reduces the shrinkage cavity of die casting pore that the die casting qualification rate is high of producing on the surface at the thicker position of moulding die casting.
To achieve these goals, the utility model adopts following technical scheme:
A kind of mould structure that reduces the shrinkage cavity of die casting pore; Comprise dynamic model, cover half, die cavity, sprue gate, gas extraction system and inserts; It is terminal along the die cavity of metallic solution flow direction that described gas extraction system is located at the sprue gate, and described gas extraction system comprises overflow launder and air discharge duct; The die cavity inwall of described die cavity thicker part is provided with some small cylindrical openings, and the described small cylindrical opening degree of depth is less than this place's cover half thickness, and described small cylindrical opening diameter is the 4-5 millimeter, and the degree of depth is the 19-20 millimeter, and monolateral gradient is the 2-3 degree.
It is terminal along the die cavity of metallic solution flow direction that gas extraction system is located at the sprue gate, is convenient in the time of cast, and metallic solution is easy to discharge the gas in the die cavity when flowing toward die cavity is terminal, and overflow launder is convenient to discharge unnecessary metallic solution.On the comparatively thick pairing cover half of face of moulding die casting product wall, small cylindrical opening is set, just is equivalent on the cover half die cavity internal face of increased number of stomata and shrinkage cavity, add overflow launder.Occur easily at die casting on the cover half die cavity internal face of pore and shrinkage cavity; Add that diameter is the 4-5 millimeter; The degree of depth is the 19-20 millimeter; Monolateral gradient is the small column of 2-3 degree, is equivalent on the die cavity internal face of pore and shrinkage cavity appears in die casting easily, add overflow launder, can't be expressed to a part in the small column through the gas that gas extraction system is got rid of.The small cylindrical opening diameter is difficult for excessive or too small.Small cylindrical opening is too small to be prone to block, and does not have scavenging action; Small cylindrical opening is excessive can cause the generation of overlap.In cast, metallic solution can be expressed to a part of gas that gas extraction system in the die cavity can't be got rid of in the small cylindrical opening.Will make pore and the shrinkage cavity on thicker die casting surface significantly reduce like this even eliminate.If on the corresponding die cavity inwall at the thicker position of die casting product, some such small cylindrical openings are set, then can improve the qualification rate of die casting product greatly.
As preferably, described small cylindrical opening diameter is 5 millimeters.5 millimeters such diameters of size, metallic solution is difficult for blocking small cylindrical opening, also can not cause the generation of die casting product overlap, the pore of die casting product surface is significantly reduced with shrinkage cavity even eliminates the qualification rate of raising die casting product.
As preferably, the described small cylindrical opening degree of depth is 20 millimeters.20 millimeters the degree of depth, metallic solution can not flow into the bottommost of small cylindrical opening under the diameter of 5 millimeters sizes; Like this; The bottommost of small cylindrical opening just can be deposited this portion gas that is extruded in the small cylindrical opening, plays the effect of exhaust, is equivalent to increase gas extraction system; Pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminate, improve the qualification rate of die casting product.
As preferably, the monolateral gradient of described small cylindrical opening is 3 degree.Small cylindrical opening has the inclination angle of one 3 degree, and it is thinner that one side guarantees that the die cavity thickness of the same degree of depth and the small cylindrical opening of size can be provided with, because small cylindrical opening is not have logical hole, the length of small column is less than the thickness of die cavity.On the other hand, the inclination angle small cylindrical opening of 3 degree can reduce the stress pressure effect of metallic solution in die cavity, can be good at making small cylindrical opening to play the effect of exhaustion spill groove.Pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminate, improve the qualification rate of die casting product.
As preferably, described small cylindrical opening is located on the die cavity inwall in the terminal thicker type of die cavity chamber.The die cavity end is the end that gas extraction system is set, and at the die cavity end gas extraction system is set and meets the requirement that the metal liquid flow direction is got rid of gas.The effect of small cylindrical opening is exactly to get rid of gas and overflow launder effect in fact.Therefore, at the die cavity end small cylindrical opening effect being set will be better, pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminates, and improves the qualification rate of die casting product.
As preferably, described some small cylindrical openings are in the same cover half face direction unanimity that tilts.Small cylindrical opening is many more, like having increased air discharge duct and overflow launder.Small cylindrical opening faces same direction along cover half and tilts, and makes that exhaust and overflow are even, makes that exhaust and overflow effect are better, pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminates the qualification rate of raising die casting product.
As preferably, described small cylindrical opening lower end is cone shape, and cone shape bottom is dome shape.Up big and down small like this, the bottom surface is the structural design of taper sphere, is convenient to separating of die casting product and cover half.
The utility model can reach following effect:
1, the utility model is provided with small cylindrical opening at the die cavity end, makes exhaust effect and overflow effective, pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminates, improve the die casting product quality and qualification rate.
2, it is terminal along the die cavity of metallic solution flow direction that the gas extraction system of the utility model is located at the sprue gate, and exhaust structure is provided with rationally, and good exhaust effect can improve the quality and the qualification rate of die casting product greatly.
Description of drawings
Fig. 1 is a kind of structural representation of small cylindrical opening on the utility model cover half.
Fig. 2 is a kind of cross-sectional view of small cylindrical opening on the utility model cover half.
1, cover half; 2, small cylindrical opening.
The specific embodiment
Embodiment: a kind of mould structure that reduces the shrinkage cavity of die casting pore.Like Fig. 1, shown in Figure 2, this is a kind of mould structure that reduces the shrinkage cavity of die casting pore, comprises dynamic model, cover half 1, die cavity, sprue gate, gas extraction system and inserts.
It is terminal along the die cavity of metallic solution flow direction that gas extraction system is located at the sprue gate, and gas extraction system comprises overflow launder and air discharge duct.Opposite, gas extraction system sprue gate.The die venting system adopts and concentrates exhaust mode, and gas extraction system is made up of the air discharge duct of dynamic model part and the air discharge duct and the overflow launder of overflow launder and cover half part, and wherein, the overflow launder of dynamic model and air discharge duct concentrate the exhaust piece to carry out exhaust through three groups.In the time of the mould matched moulds; Because of air is arranged in the mold cavity; In the time of cast, the inner air of die cavity can produce excessive pressure, can cause some positions of pours to cause cast member imperfect because of the air pressure effect; Or the generation deficient phenomena, at this moment will make exhaust apparatus and make things convenient for deaeration in these relevant positions.The die casting mouth is located at the recessed position of moulding die casting, and the sprue gate is four road sprues.The opposite, sprue gate is provided with gas extraction system, and gas extraction system is made up of overflow launder and air discharge duct, is used for along the end of metal flow direction, gets rid of gas and clout.
Present embodiment is provided with three small cylindrical openings 2 on the die cavity inwall of die cavity thicker part; Small cylindrical opening is located on the cover half inwall in the terminal thicker type of die cavity chamber; Three small cylindrical openings are in the same cover half face direction unanimity that tilts, and the small cylindrical opening lower end is cone shape, and cone shape bottom is dome shape.The number of small cylindrical opening is set according to the surface area at the thicker position of die casting product.Small cylindrical opening is many more, like having increased air discharge duct and overflow launder.Small cylindrical opening faces same direction along cover half and tilts, and makes that exhaust and overflow are even, makes that exhaust and overflow effect are better, pore and the shrinkage cavity of die casting product surface are significantly reduced even eliminates the qualification rate of raising die casting product.The small cylindrical opening lower end is cone shape, and cone shape bottom is dome shape.Small cylindrical opening is up big and down small, the bottom surface is the structural design of taper sphere, is convenient to separating of die casting product and cover half.Be convenient to construction operation, guaranteed the quality and the qualification rate of die casting product.
The small cylindrical opening degree of depth is less than this place's cover half thickness, and the small cylindrical opening diameter is 5 millimeters, and the degree of depth is 20 millimeters, and monolateral gradient is 3 degree.Being equivalent to has increased more overflow launder in die cavity, in injection, the gas that can't get rid of a part is expressed in the small column.The small cylindrical opening of the degree of depth and gradient like this, the metallic solution that difficult quilt flies is blocked in advance, and a part of gas of in the time of die casting, not getting rid of from air discharge duct is entered in the small cylindrical opening.This small cylindrical opening is equivalent to air discharge duct, and air discharge duct is opened too much, except running metallic solution, and reducing the die cavity internal gas pressure when also having fast shot; If air discharge duct opens for a short time, exhaust is not smooth, and then the die cavity internal gas pressure is higher during fast shot, pins financial liquid level of solution, makes metallic solution be difficult for swashing to penetrate die cavity to produce eddy current, is involved in gas less, thereby reduces pore and shrinkage cavity on the die casting.Up big and down small like this, the bottom surface is the structural design of taper sphere, is convenient to separating of die casting product and cover half.
After the such mould structure of present embodiment designed, on the face that has increased number of stomata and shrinkage cavity originally, pore and shrinkage cavity will obviously reduce, even do not have pore and shrinkage cavity, and simple in structure, effect is obvious.
Combine accompanying drawing to describe the embodiment of the utility model above, but not limited by the foregoing description when realizing, those of ordinary skills can make various variations or modification within the scope of the appended claims.
Claims (7)
1. mould structure that reduces the shrinkage cavity of die casting pore; Comprise dynamic model, cover half, die cavity, sprue gate, gas extraction system and inserts; It is characterized in that it is terminal along the die cavity of metallic solution flow direction that described gas extraction system is located at the sprue gate, described gas extraction system comprises overflow launder and air discharge duct; The die cavity inwall of described die cavity thicker part is provided with some small cylindrical openings, and the described small cylindrical opening degree of depth is less than this place's cover half thickness, and described small cylindrical opening diameter is the 4-5 millimeter, and the degree of depth is the 19-20 millimeter, and monolateral gradient is the 2-3 degree.
2. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 1 is characterized in that described small cylindrical opening diameter is 5 millimeters.
3. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 1 and 2 is characterized in that the described small cylindrical opening degree of depth is 20 millimeters.
4. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 3 is characterized in that, the monolateral gradient of described small cylindrical opening is 3 degree.
5. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 4 is characterized in that, described small cylindrical opening is located on the die cavity inwall in the terminal thicker type of die cavity chamber.
6. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 5 is characterized in that, described some small cylindrical openings are in the same cover half face direction unanimity that tilts.
7. a kind of mould structure that reduces the shrinkage cavity of die casting pore according to claim 6 is characterized in that described small cylindrical opening lower end is cone shape, and cone shape bottom is dome shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220091414 CN202571241U (en) | 2012-03-13 | 2012-03-13 | Die structure for reducing air holes and shrinkage holes of pressure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220091414 CN202571241U (en) | 2012-03-13 | 2012-03-13 | Die structure for reducing air holes and shrinkage holes of pressure casting |
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| CN202571241U true CN202571241U (en) | 2012-12-05 |
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| CN 201220091414 Expired - Fee Related CN202571241U (en) | 2012-03-13 | 2012-03-13 | Die structure for reducing air holes and shrinkage holes of pressure casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105014039A (en) * | 2015-08-25 | 2015-11-04 | 东莞市东升压铸模具有限公司 | Die-casting die capable of improving sand hole distribution, die-casting process and sand-hole-free product obtaining method |
| CN105710338A (en) * | 2015-11-25 | 2016-06-29 | 宁波君灵模具技术有限公司 | Four-cylinder box mold for eliminating machine surface air holes and manufacturing method thereof |
-
2012
- 2012-03-13 CN CN 201220091414 patent/CN202571241U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105014039A (en) * | 2015-08-25 | 2015-11-04 | 东莞市东升压铸模具有限公司 | Die-casting die capable of improving sand hole distribution, die-casting process and sand-hole-free product obtaining method |
| CN105014039B (en) * | 2015-08-25 | 2017-05-31 | 东莞市东升压铸模具有限公司 | A kind of die casting for improving sand hole distribution, extrusion process and the preparation method without sand hole product |
| CN105710338A (en) * | 2015-11-25 | 2016-06-29 | 宁波君灵模具技术有限公司 | Four-cylinder box mold for eliminating machine surface air holes and manufacturing method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |