CN102554185A - Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators - Google Patents
Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators Download PDFInfo
- Publication number
- CN102554185A CN102554185A CN2012100609260A CN201210060926A CN102554185A CN 102554185 A CN102554185 A CN 102554185A CN 2012100609260 A CN2012100609260 A CN 2012100609260A CN 201210060926 A CN201210060926 A CN 201210060926A CN 102554185 A CN102554185 A CN 102554185A
- Authority
- CN
- China
- Prior art keywords
- ingate
- casting
- mold
- low pressure
- casting mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Induction Machinery (AREA)
Abstract
The invention relates to a pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators. The pouring system of a casting mold comprises a straight runner, a horizontal runner and inner gates, and is innovatively characterized in that the inner gates are arranged in positions in a mold cavity of the casting mold, which are corresponding to the bottom of a product inner ring and close to connecting ribs; the inner gates are similarly arranged in positions in the mold cavity, which are corresponding to the bottom of a product outer ring and close to the connecting ribs; the inner gates are respectively communicated with a liquid lifting pipe of low pressure casting equipment through the straight and the horizontal runners; wedge-shaped structures are adopted by the inner gates; and an exhaust cooling needle is arranged at the top of the casting mold. The inner gates of the pouring system are arranged in the positions of the inner and the outer rings, which are close to the connecting ribs, so a good mold filling effect is achieved; the wedge-shaped structures are adopted by the inner gates, so the temperature of a sand mold at the upper side wall parts of the inner gates can be improved, hot spots are easy to eliminate, and consecutive solidification is smoothly realized; a fireproof material layer is spread on the surface of the mold cavity of the casting mold, so aluminum liquid cannot enter the sand mold to produce gas at high temperature during long time pressurization and pressure maintaining and thereby shrinkage porosity is avoided.
Description
Technical field
The present invention relates to a kind of running gate system, particularly a kind of running gate system that is used for low pressure casting 64 row's spiral CT machine stators.
Background technology
The medical equipment level of China medical institutions is also very low; About 15% is the product of the front and back seventies in 20th century in Medical Instruments that the whole nation 17.5 ten thousand tame health care machineries have and the equipment; The 60%th, the product of the mid-80, large-scale diagnoses and treatment apparatus such as X-ray machine, CT scan, nuclear magnetic resonance, Deep X-Ray treatment, cobalt-60 therapy machine, gamma knife etc. are the equipment that each third-class, second-class first class hospital is badly in need of equipment, upgrades.But mainly from the U.S., Europe, Japanese import, these equipment are hundreds of thousands at least for these high, precision and frontier equipment, and are up to ten million at most, and this is a challenge to the not rich medical insurance resource of China's financial strength.High-end medicine equipment is if realize production domesticization, and its price arrives half the than import cheap 1/3.But medical device industry is a multidisciplinary intersection, the knowledge intensive high-tech industry, and entry threshold is higher.It is one of difficulty of China's medical apparatus industry upgrading that the core component technology can't be grasped, and is exactly the kernel component of this equipment like at present state-of-the-art 64 row's spiral CT frame stators, rotor; These core components all be unable to do without high accuracy, high rigidity, large-scale aluminium casting that dimensional stability is good, complex-shaped.At present domestic do not have enterprise formally to produce these aluminium castings as yet.
The structure of 64 row's spiral CT frame stators is: comprise tapered sleeve shape inner ring 1 and outer ring 2, inner ring 1, outer ring 2 connect through dowel 3, and dowel quantity is 7.Outer ring 2 diameters reach Φ 1800mm, and the housing height is 550mm, and wall thickness is at 8 ~ 45mm, and outstanding difference is very big, and inner ring 1,2 bottoms, outer ring are formed with many cavitys after connecting through dowel 3, and inner ring 1 also has some cavitys.Its to aluminum liquid filling type, solidify, feeding and shrinkage factor confirm to bring certain difficulty.
The low pressure casting that pouring procedure commonly used in the world at present adopts casting mold band rising head and do not seal, the feeding of foundry goods is called the open type low-pressure casting again usually through emitting effected.There is certain defective: a in this kind technology, adopts the running gate system of band heavy caliber rising head; The cast gate design is in the side of casting mold away from dowel; Carry out exhaust, feeding and in the side that dowel is arranged some rising heads are set, molten metal technology recovery rate is low, and machining processes is many; B, rising head be arranged so that it only is to utilize low pressure to fill type and can't adopt the technology of supercharging crystallization, be not the low pressure casting of real meaning, the feeding effect is poor slightly, the compactness of foundry goods tissue has certain influence; C, running gate system adopt emits mouth structure as cast gate in traditional gravity-assist pouring, and cast gate is flat pattern, and thermal center is difficult for eliminating, and has shrinkage porosite, hole.Therefore when adopting this kind technology to carry out the production of 64 row's spiral CT frame stators, technology and equipment have all been proposed very high requirement, the above-mentioned this low pressure of domestic employing is filled type technology when producing this product, and casting qualified rate is very low.
Summary of the invention
The technical problem that the present invention will solve provides a kind of running gate system that is used for low pressure casting 64 row's spiral CT machine stators, and the molten metal recovery rate is high, the process-cycle is short and foundry goods dense structure property is high.
For solving the problems of the technologies described above; Technical scheme of the present invention is: a kind of running gate system that is used for low pressure casting 64 row's spiral CT machine stators; The running gate system of said casting mold comprises sprue, cross gate and ingate; Its innovative point is: be provided with ingate bottom the corresponding product inner ring and near the dowel place in the said casting mold die cavity; Be provided with ingate equally bottom the corresponding product outer ring and near the dowel place in the die cavity, ingate is communicated with the stalk of low-pressure die casting plant through sprue, cross gate respectively; Said ingate adopts wedge structure: the angle β of ingate upper portion side wall and ingate axis is greater than the angle of ingate lower sides and ingate axis; The top of said casting mold is provided with exhaust cooling pin.
Further, the mold cavity surface of said casting mold is coated with refractory masses.
The invention has the advantages that: adopt no riser gating system, running gate system is reduced to 108 kilograms by original more than 300 kilogram, and the cast recovery rate is improved; Simultaneously, saved the operation of remove feeders in the machined, improved working (machining) efficiency, by being reduced to for 14 man-hours original 40 man-hours; Realized real low pressure casting, pressure solidifies, and feeding is effective, and the compactness of foundry goods tissue is improved, and utilizes x-ray scanning, the gas porosity that its foundry goods is divided into 39 zones all reach 4 grades or more than.The ingate of running gate system is arranged on inside and outside circle near the dowel place, and it is effective to fill type, and ingate employing wedge structure, can improve the temperature of ingate upper portion side wall part sand mold, and thermal center is eliminated easily, realizes consecutive solidification smoothly.The mold cavity surface of casting mold is coated with refractory masses, and when guaranteeing long-time supercharging, pressurize, aluminium liquid can not get into sand mold high temperature and produce gas, avoids shrinkage porosite.Product overall acceptability rate reaches more than 98%, compares tradition band rising head low pressure and fills type technology and improved about 30%.
Description of drawings
Fig. 1 is 64 row's spiral CT frame stator structure sketch mapes.
Fig. 2 is 64 row's spiral CT frame stator running gate system sketch mapes among the present invention.
Fig. 3 is ingate structural representation among the present invention.
The specific embodiment
The low-pressure casting step mainly comprises:
A: at first utilize resin sand to carry out moulding, coremaking according to 64 row's spiral CT frame stator profile.
B: the casting mold mold cavity surface that makes is brushed with special-purpose fire-resistant coating and does and light processing, and this special-purpose fire-resistant formulation for coating material is open in number of patent application 201010111977.2, repeats no more here.
C: the oven dry processing and the matched moulds that carry out casting mold: casting mold is heated to 150 ℃-170 ℃ constant temperature 2-4 hour after getting into drying box.Play core then, and 2 thick major parts are placed the variable cross-section chills in the outer ring, last mould assembling.
D: be placed into after the mould assembling and carry out low-pressure casting on the cast-iron pot smelting furnace, pouring temperature: between 700 ℃-750 ℃, filling velocity: 5-20cm/s, filling time: 70-90s; Boost pressure: 1-1.2 kPa, dwell pressure: 1-1.5 kPa, dwell time: 10-30s; Must carry out lentamente during release, being sure not can not fast pressure relief; The cleaning of devaning: the workpiece after the casting treats that the nature cooling can devan after 2 hours, takes out clear blank.
The casting mold die cavity is set in the above-mentioned low-pressure casting: the dowel 3 that connects inner ring 1 and outer ring 2 is positioned at the bottom.
The running gate system of casting mold comprises sprue, cross gate and ingate; Corresponding product inner ring 1 bottom and be provided with ingate 4 in the casting mold die cavity near dowel 3 places; 2 bottoms, corresponding product outer ring and be provided with ingate 5 equally near dowel 3 places, each ingate 4,5 is communicated with the stalk of low-pressure die casting plant through sprue 6, cross gate 7, cast gate 8 respectively.As shown in Figure 2, the dowel 3 of 64 row's spiral CT frame stators has 7 among the present invention, and every dowel 3 places all establish ingate, so establish 7 ingates on the inner ring 1, establish 7 ingates on the outer ring.Ingate and casting mold die cavity contact position cross section are rectangle.
Ingate adopts wedge shape ingate structure: as shown in Figure 3; The angle β of ingate upper portion side wall and ingate axis is greater than the angle of ingate lower sides and ingate axis; Make molten metal when ingate gets in the die cavity, can improve the temperature of ingate upper portion side wall part sand mold.The size of angle β is at 12-18 °.
The top of casting mold is provided with exhaust cooling pin; Its structure: comprise the vertical long hole of a diameter at 5-8mm; This vertical long hole lower end is communicated with the casting mold die cavity; The upper end is provided with the small-bore through hole of diameter at 2-3mm near the casting mold top at the casting mold top, and this small-bore through hole is with vertical long hole and extraneous conducting.The concrete method to set up of this exhaust cooling pin is: on sand mold, vertically get out at least one vertical long hole with die cavity and extraneous conducting; Smear the refractory masses of one section pasty state downwards in the aperture, upper end of said vertical long hole; On said refractory masses, bore small-bore through hole with the vertical long hole conducting; Refractory masses heat hardening to pasty state.
Adopt 64 row's spiral CT machine stators of said method cast, through detecting, the overall acceptability rate reaches more than 98%, compares tradition band rising head low pressure and fills type technology and improved about 30%.
Claims (2)
1. one kind is used for the running gate system that low pressure casting 64 is arranged the spiral CT machine stators; The running gate system of said casting mold comprises sprue, cross gate and ingate; It is characterized in that: be provided with ingate bottom the corresponding product inner ring and near the dowel place in the said casting mold die cavity; Be provided with ingate equally bottom the corresponding product outer ring and near the dowel place in the die cavity, ingate is communicated with the stalk of low-pressure die casting plant through sprue, cross gate respectively; Said ingate adopts wedge structure: the angle β of ingate upper portion side wall and ingate axis is greater than the angle of ingate lower sides and ingate axis; The top of said casting mold is provided with exhaust cooling pin.
2. the running gate system that is used for low pressure casting 64 row's spiral CT machine stators according to claim 1, it is characterized in that: the mold cavity surface of said casting mold is coated with refractory masses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210060926 CN102554185B (en) | 2012-03-09 | 2012-03-09 | Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210060926 CN102554185B (en) | 2012-03-09 | 2012-03-09 | Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102554185A true CN102554185A (en) | 2012-07-11 |
| CN102554185B CN102554185B (en) | 2013-10-23 |
Family
ID=46401551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210060926 Active CN102554185B (en) | 2012-03-09 | 2012-03-09 | Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102554185B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103568221A (en) * | 2013-11-12 | 2014-02-12 | 昆山市硕强信息咨询有限公司 | Mould for solving problem of surface shrinkage of products |
| CN103934433A (en) * | 2014-03-27 | 2014-07-23 | 哈尔滨工业大学 | Low-pressure casting deformation control method for large thin-wall cylindrical shell aluminum alloy near-net formed casting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1439180A (en) * | 1972-06-07 | 1976-06-09 | Schubert I Schubert A | Method and apparatus for casting annular workpieces of high dimensional accuracy |
| JPS6310056A (en) * | 1986-06-30 | 1988-01-16 | Toyo Tire & Rubber Co Ltd | Mold for low pressure casting of metal die for vulcanizing tyre forming |
| CN201673886U (en) * | 2010-04-30 | 2010-12-15 | 珠海瑞能真空电子有限公司 | CT pipet with outer rotor structure |
| CN102290311A (en) * | 2010-06-16 | 2011-12-21 | 通用电气公司 | Repairable monoblock x-ray generating device |
| CN202479477U (en) * | 2012-03-09 | 2012-10-10 | 南通爱尔思轻合金精密成型有限公司 | Gating system for low-pressure casting of stator of 64-row spiral CT (computed tomography) machine |
-
2012
- 2012-03-09 CN CN 201210060926 patent/CN102554185B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1439180A (en) * | 1972-06-07 | 1976-06-09 | Schubert I Schubert A | Method and apparatus for casting annular workpieces of high dimensional accuracy |
| JPS6310056A (en) * | 1986-06-30 | 1988-01-16 | Toyo Tire & Rubber Co Ltd | Mold for low pressure casting of metal die for vulcanizing tyre forming |
| CN201673886U (en) * | 2010-04-30 | 2010-12-15 | 珠海瑞能真空电子有限公司 | CT pipet with outer rotor structure |
| CN102290311A (en) * | 2010-06-16 | 2011-12-21 | 通用电气公司 | Repairable monoblock x-ray generating device |
| CN202479477U (en) * | 2012-03-09 | 2012-10-10 | 南通爱尔思轻合金精密成型有限公司 | Gating system for low-pressure casting of stator of 64-row spiral CT (computed tomography) machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103568221A (en) * | 2013-11-12 | 2014-02-12 | 昆山市硕强信息咨询有限公司 | Mould for solving problem of surface shrinkage of products |
| CN103934433A (en) * | 2014-03-27 | 2014-07-23 | 哈尔滨工业大学 | Low-pressure casting deformation control method for large thin-wall cylindrical shell aluminum alloy near-net formed casting |
| CN103934433B (en) * | 2014-03-27 | 2015-11-18 | 哈尔滨工业大学 | Large thin-wall barrel-type casing aluminium alloy near-net-shape foundry goods low pressure casting deformation control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102554185B (en) | 2013-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104190875B (en) | A kind of composite mould manufacturing process of Complex Thin Shell | |
| CN202479477U (en) | Gating system for low-pressure casting of stator of 64-row spiral CT (computed tomography) machine | |
| CN103143685B (en) | A kind of casting mould of circular cylindrical shell body component and casting method thereof | |
| CN207026420U (en) | A kind of sand core structure of turbine blade steel-casting | |
| CN111558689A (en) | Novel manufacturing process of impeller | |
| CN102049472A (en) | Method for casting special case casting core mould | |
| CN105328122B (en) | A kind of high ferro brake disc drag ring device for sand coated iron mould casting device and casting technique | |
| CN110548856B (en) | Composite casting mold of aluminum alloy shell casting and forming method thereof | |
| CN102416442A (en) | One-box multi-piece casting mold and casting method for brake disc castings | |
| CN102554185B (en) | Pouring system used for low pressure casting of 64-slice spiral computed tomography (CT) machine stators | |
| CN205732899U (en) | The compression mod of processing top cover | |
| CN109396345A (en) | A method of for investment casting formwork part Quench | |
| CN108971425A (en) | A kind of casting method solving the loose class defect of thick-wall nodular iron | |
| CN106964756A (en) | A kind of vertical pattern grouping mould of steel-casting and its pattern grouping method | |
| CN107321919A (en) | A kind of casting method based on novel oil pump body shell type | |
| CN107282909A (en) | A kind of running gate system and centre spinning method for tube shape component | |
| US11858032B2 (en) | High-temperature alloy pressure casting mold and casting process for impeller and guide vane | |
| CN209110156U (en) | Shell moulded casting device of the vacuum in conjunction with pressure | |
| CN106984769A (en) | A kind of hot investment casting pressure wax apparatus | |
| CN204413064U (en) | A kind of oil drilling pump crosshead die | |
| CN102806317B (en) | Casting method of locomotive diesel engine body | |
| CN203541439U (en) | Runner system for investment casting process | |
| CN112404355A (en) | Casting method of CT machine base steel casting | |
| CN203197224U (en) | Motor shell die-casting die | |
| CN205519575U (en) | Lower mode structure of motor cover body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |