CN104043780A - Vane pump casting mold and casting process thereof - Google Patents
Vane pump casting mold and casting process thereof Download PDFInfo
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- CN104043780A CN104043780A CN201410285087.1A CN201410285087A CN104043780A CN 104043780 A CN104043780 A CN 104043780A CN 201410285087 A CN201410285087 A CN 201410285087A CN 104043780 A CN104043780 A CN 104043780A
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- exothermic riser
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Abstract
The invention discloses a vane pump casting mold and a casting process thereof in the field of casting. The casting process of the vane pump casting mold comprises the following steps of loam core sand molding, pouring, cooling and demolding, and is characterized in that the casting process adopts an opening type casting system, and due to the opening type casting system, the flow velocity of molten iron is reduced, the scouring to a casting mold is alleviated, a precoated sand shell with an exothermic riser for positioning is used as an upper-half clay sand mold cavity of the casting mold, and the precoated sand shell falls to a lower casting cavity, an exothermic riser cavity is reserved on an upper-half casting mold, and a chiller is arranged in a lower box of the casting mold; the exothermic riser is arranged at the middle upper part of the casting mold, and is used for feeding the shrinkage porosity part of the casting mold, and the shrinkage porosity in the central part is eliminated due to the chilling effect of the chiller in the middle. According to the vane pump casting mold and the casting process thereof, as the precoated sand shell with the exothermic riser for positioning is used as the upper-half clay sand mold cavity of the casting mold, the application of the low-strength exothermic riser to a vertical sand-shooting high-pressure molding line is realized, and the production cost of the casting mold is lowered.
Description
Technical field
The present invention relates to a kind of vane pump casting die and the casting technique thereof of casting field.
Background technology
In the hydraulic valve Product Process trial-manufacturing process of FSPX206 series, through pouring experiment, find that shrinkage defect appears in foundry goods oil duct core, sand hole of cast is more.Analyze the reason that casting defect produces: the reason that 1. Shrinkage Porosity produces is that product loam core is more complicated, became uneven, center main aperture has stopped that the feeding of another side causes foundry goods to produce shrinkage porosite; 2. the molding sand that the reason of sand hole is come because of the projection on rising head side, molten iron is concentrated and is scrubbed for a long time, causes the generation of sand hole defect.Adopt and increase rising head diameter to 120MM and increase riser height and test, the defect of Shrinkage Porosity does not still solve.The shrinkage cavity shrinkage porosity feeding defect occurring for foundry goods, need to strengthen the cooling velocity of shrinkage cavity shrinkage porosity position to reach the object of this position feeding of strengthening.Therefore at the nowel of foundry goods, placing chill tests.The shrinkage porosite of cast anatomical results foundry goods core has solved, but there is shrinkage defect in the position, two at foundry goods, chill in the middle of analyzing its reason and being is because its chilling action has solved the shrinkage porosite in centre, but the Feeding channel of two foundry goods has been stopped, caused foundry goods two to occur shrinkage defect simultaneously.
Summary of the invention
The object of the invention is, by the improvement to mould and casting mode, to solve cast(ing) surface sand hole defect and shrinkage porosity defect of contraction cavity problem.
The present invention is achieved by the following technical solutions:
A kind of vane pump casting die and casting technique thereof, comprise mud core molding sand moulding, cast, the cooling and demoulding, it is characterized in that: described casting technique adopts open casting system, open casting system has reduced molten iron flow velocity, alleviate the washing away of casting mold, first clay sand mold die cavity of casting mold is with the precoated sand arenaceous shell of exothermic riser location, drops down onto casting mold mo(u)ld bottom half, and at the reserved exothermic riser die cavity of first casting mold, the nowel of foundry goods is placed chill; Exothermic riser is placed on foundry goods and produces middle upper portion, directly Shrinkage Porosity place is carried out to feeding, and middle chill is because its chilling action has solved the shrinkage porosite in centre; Unit, the cross section ratio of respectively organizing of open casting system adopts Σ F straight: Σ F is horizontal: in Σ F=and 1:1.2:1.4; Exothermic riser is common exothermic riser, and the cost of common exothermic riser is lower than high exothermic riser, and feeder modulus is diameter 70mm; On casting mold, half mould adopts precoated sand arenaceous shell, makes exothermic riser seat on arenaceous shell, makes exothermic riser chamber in top box, before mould assembly, puts arenaceous shell and exothermic riser well rear mould assembly, and rising head does not bear pressure like this, avoids exothermic riser crushed.
The present invention passes through first clay sand mold die cavity of casting mold, change the precoated sand arenaceous shell with exothermic riser location into, drop down onto casting mold mo(u)ld bottom half, and at the reserved exothermic riser die cavity of first casting mold, realize the application of low-intensity exothermic riser on vertical sand shooting sand high-pressure molding line, reduced the production cost of foundry goods.
Figure of description
Fig. 1 is exothermic riser structure chart.
The specific embodiment
Below in conjunction with in concrete enforcement, content of the present invention being described further:
For solving casting process medium casting oil duct core, there is shrinkage defect and the more problem of sand hole of cast in object of the present invention.
Casting defect produces main cause: the reason that Shrinkage Porosity produces is that product loam core is more complicated, became uneven, and center main aperture has stopped that the feeding of another side causes foundry goods to produce shrinkage porosite; The molding sand that the reason of sand hole is come because of the projection on rising head side, molten iron is concentrated and is scrubbed for a long time, causes the generation of sand hole defect.
By test, casting process is carried out to following improvement:
1) what original running gate system adopted is semi-enclosed, and each constituent element cross section ratio is that Σ F is straight: Σ F is horizontal: in Σ F=1.1:1.4:1, choked flow cross section is at ingate place, and such molten iron flow velocity at ingate place is the fastest, serious to washing away of sand mold.Running gate system is made into open, reduce molten iron washing away casting mold.The economy of its technique is too poor, therefore adopts common exothermic riser.Open for running gate system employing, its cross section choke unit adopts Σ F straight: Σ F is horizontal: in Σ F=and 1:1.2:1.4.
2) select exothermic riser kind and size: the modulus M=1.59cm of foundry goods as calculated, the minimum modules of rising head is 1.59 * 1.2=1.908cm, the immediate modulus of commodity exothermic riser is 2.0cm.The type of exothermic riser has common exothermic riser and the high exothermic riser of high strength, relatively the feature of two kinds of rising heads: its intensity of common exothermic riser is low, caloric value is little, but its price d that modulus is 2.0cm is low; High exothermic riser caloric value is large, and intensity is high, but its price is very high, considers that the economy of technique is chosen common exothermic riser.According to the modulus of rising head, choose the common exothermic riser of diameter 70mm (M=2.00).
According to above thinking, mould has been carried out to corresponding improvement, on casting mold, half mould adopts precoated sand arenaceous shell, makes exothermic riser seat on arenaceous shell, makes exothermic riser chamber in top box, before mould assembly, puts arenaceous shell and exothermic riser well rear mould assembly, and rising head does not bear pressure like this.According to this thinking, revise mould and test, exothermic riser is not found disrepair phenomenon, and cast(ing) surface do not find sand hole defect yet, and foundry goods dense structure after dissecting, without shrinkage porosity defect of contraction cavity.
Claims (5)
1. a vane pump casting die and casting technique thereof, comprise mud core molding sand moulding, cast, the cooling and demoulding, it is characterized in that: described casting technique adopts open casting system, first clay sand mold die cavity of casting mold is the precoated sand arenaceous shell with exothermic riser location, drop down onto casting mold mo(u)ld bottom half, and at the reserved exothermic riser die cavity of first casting mold, the nowel of foundry goods is placed chill.
2. vane pump casting die according to claim 1 and casting technique thereof, is characterized in that: exothermic riser is placed on foundry goods and produces middle upper portion, directly Shrinkage Porosity place is carried out to feeding.
3. vane pump casting die according to claim 1 and casting technique thereof, is characterized in that: unit, the cross section ratio of respectively organizing of open casting system adopts Σ F straight: Σ F is horizontal: in Σ F=and 1:1.2:1.4.
4. vane pump casting die according to claim 1 and casting technique thereof, is characterized in that: exothermic riser is common exothermic riser, and feeder modulus is diameter 70mm.
5. vane pump casting die according to claim 1 and casting technique thereof, it is characterized in that: on casting mold, half mould adopts precoated sand arenaceous shell, on arenaceous shell, make exothermic riser seat, in top box, make exothermic riser chamber, before mould assembly, put arenaceous shell and exothermic riser well rear mould assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410285087.1A CN104043780A (en) | 2014-06-24 | 2014-06-24 | Vane pump casting mold and casting process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410285087.1A CN104043780A (en) | 2014-06-24 | 2014-06-24 | Vane pump casting mold and casting process thereof |
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| CN104043780A true CN104043780A (en) | 2014-09-17 |
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| CN201410285087.1A Pending CN104043780A (en) | 2014-06-24 | 2014-06-24 | Vane pump casting mold and casting process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215285A (en) * | 2015-10-27 | 2016-01-06 | 上海航天精密机械研究所 | A kind of vibration instrumentation expanding table top casting method |
| CN105382200A (en) * | 2015-12-03 | 2016-03-09 | 安徽省巢湖铸造厂有限责任公司 | Method for producing pre-embedded iron bases of fasteners for freight heavy-haul railways |
| CN108941815A (en) * | 2018-08-09 | 2018-12-07 | 苏州铜盟电气有限公司 | A method of casting and welding |
| CN115255831A (en) * | 2022-08-01 | 2022-11-01 | 常熟市翔翼精密机械科技有限公司 | Production process of centrifugal pump shaft connecting bearing pump body |
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| JP2003311371A (en) * | 2002-04-26 | 2003-11-05 | Hiroshima Aluminum Industry Co Ltd | Method for casting vacuum chamber into sand mold |
| CN102389945A (en) * | 2011-11-07 | 2012-03-28 | 陈显鹏 | Metal type covered shell casting mold and casting method thereof |
| CN202984581U (en) * | 2013-01-06 | 2013-06-12 | 阜新九丰液压有限公司 | Vertical type green sand inner shell type modeling structure |
| CN103506580A (en) * | 2013-10-30 | 2014-01-15 | 宜昌船舶柴油机有限公司 | Casting method for large thin-wall valve body steel casting |
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2014
- 2014-06-24 CN CN201410285087.1A patent/CN104043780A/en active Pending
Patent Citations (4)
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| JP2003311371A (en) * | 2002-04-26 | 2003-11-05 | Hiroshima Aluminum Industry Co Ltd | Method for casting vacuum chamber into sand mold |
| CN102389945A (en) * | 2011-11-07 | 2012-03-28 | 陈显鹏 | Metal type covered shell casting mold and casting method thereof |
| CN202984581U (en) * | 2013-01-06 | 2013-06-12 | 阜新九丰液压有限公司 | Vertical type green sand inner shell type modeling structure |
| CN103506580A (en) * | 2013-10-30 | 2014-01-15 | 宜昌船舶柴油机有限公司 | Casting method for large thin-wall valve body steel casting |
Non-Patent Citations (3)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215285A (en) * | 2015-10-27 | 2016-01-06 | 上海航天精密机械研究所 | A kind of vibration instrumentation expanding table top casting method |
| CN105382200A (en) * | 2015-12-03 | 2016-03-09 | 安徽省巢湖铸造厂有限责任公司 | Method for producing pre-embedded iron bases of fasteners for freight heavy-haul railways |
| CN108941815A (en) * | 2018-08-09 | 2018-12-07 | 苏州铜盟电气有限公司 | A method of casting and welding |
| CN115255831A (en) * | 2022-08-01 | 2022-11-01 | 常熟市翔翼精密机械科技有限公司 | Production process of centrifugal pump shaft connecting bearing pump body |
| CN115255831B (en) * | 2022-08-01 | 2024-03-19 | 常熟市翔翼精密机械科技有限公司 | Production process of centrifugal pump shaft connecting bearing pump body |
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Application publication date: 20140917 |
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