CN102554185B - 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
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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 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 20 century 70s front and back in 17.5 ten thousand Medical Instruments that health care machinery has in the whole nation 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.If high-end medicine equipment is realized production domesticization, its cost ratio import cheap 1/3 is to half.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 such as 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, good stability of the dimension, complex-shaped Large size Aluminium foundry goods.At present domestic not yet have enterprise formally to produce these aluminium castings.
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 by 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 large, and inner ring 1,2 bottoms, outer ring are formed with many cavitys after connecting by dowel 3, and inner ring 1 also has some cavitys.Its to aluminum liquid filling type, solidify, feeding and shrinkage factor determine to bring certain difficulty.
The low pressure casting that the pouring procedure of commonly using in the world at present adopts casting mold band rising head and do not seal, the feeding of foundry goods realizes by rising head, usually is called again the open type low-pressure casting.There is certain defective: a in this kind technique, adopts the running gate system with the 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 technique 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 technique of supercharging crystallization, be not the low pressure casting of real meaning, the feeding effect is slightly poor, the compactness of foundry goods tissue has certain impact; C, running gate system adopt dead head structure in traditional gravity-assist pouring as cast gate, and cast gate is flat pattern, and thermal center is difficult for eliminating, and has shrinkage porosite, hole.Therefore when adopting this kind technique to carry out the production of 64 row's spiral CT frame stators, technology and equipment has all been proposed very high requirement, the above-mentioned this low pressure of domestic employing is filled type technique when producing this product, and casting qualified rate is very low.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of running gate system 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 for low pressure casting 64 row's spiral CT machine stators, the running gate system of described casting mold comprises sprue, cross gate and ingate, its innovative point is: corresponding product inner ring bottom and close dowel place are provided with ingate in the described casting mold die cavity, bottom, corresponding product outer ring and close dowel place are provided with ingate equally in the die cavity, and ingate is communicated with the stalk of low-pressure die casting plant by sprue, cross gate respectively; Described ingate adopts wedge structure: the angle β of ingate upper portion side wall and ingate axis is greater than the angle α of ingate lower sides and ingate axis; The top of described casting mold arranges exhaust cooling pin.
Further, the mold cavity surface of described casting mold is coated with refractory masses.
The invention has the advantages that: adopt without the riser gating system, running gate system is down to 108 kilograms by original more than 300 kilogram, and the cast recovery rate is improved; Simultaneously, save 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 smoothly consecutive solidification.The mold cavity surface of casting mold is coated with refractory masses, and when guaranteeing long-time supercharging, pressurize, aluminium liquid can not enter 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 technique and improved about 30%.
Description of drawings
Fig. 1 is 64 row's spiral CT frame stator structure schematic diagrames.
Fig. 2 is 64 row's spiral CT frame stator running gate system schematic diagrames 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 drying and processing and the matched moulds that carry out casting mold: after casting mold enters drying box, heat to 150 ℃-170 ℃ constant temperature 2-4 hour.Then play core, 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 can be devaned after 2 hours until natural cooling, 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 close dowel 3 places are provided with ingate 4 in the casting mold die cavity, 2 bottoms, corresponding product outer ring and close dowel 3 places are provided with ingate 5 equally, and each ingate 4,5 is communicated with the stalk of low-pressure die casting plant by 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 α of ingate lower sides and ingate axis, so that molten metal when entering in the die cavity from ingate, 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 arranges exhaust cooling pin, its structure: comprise that a diameter is at the vertical long hole of 5-8mm, this vertical long hole lower end is communicated with the casting mold die cavity, the upper end is near the casting mold top, diameter is set at the small-bore through hole of 2-3mm at the casting mold top, 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: vertically get out at least one with the vertical long hole of die cavity and extraneous conducting on sand mold; Smear the refractory masses of one section pasty state downwards in the aperture, upper end of described vertical long hole; At the small-bore through hole of described refractory masses brill 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, after testing, the overall acceptability rate reaches more than 98%, compares tradition band rising head low pressure and fills type technique 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 described casting mold comprises sprue, cross gate and ingate, it is characterized in that: corresponding product inner ring bottom and close dowel place are provided with ingate in the described casting mold die cavity, bottom, corresponding product outer ring and close dowel place are provided with ingate equally in the die cavity, and ingate is communicated with the stalk of low-pressure die casting plant by sprue, cross gate respectively; Described ingate adopts wedge structure: the angle β of ingate upper portion side wall and ingate axis is greater than the angle α of ingate lower sides and ingate axis; The top of described casting mold arranges exhaust cooling pin.
2. the running gate system for low pressure casting 64 row spiral CT machine stators according to claim 1, it is characterized in that: the mold cavity surface of described casting mold is coated with refractory masses.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| 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 |
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| CN102554185A CN102554185A (en) | 2012-07-11 |
| CN102554185B true CN102554185B (en) | 2013-10-23 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
Citations (4)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2012
- 2012-03-09 CN CN 201210060926 patent/CN102554185B/en active Active
Patent Citations (4)
| 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 |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| JP昭63-10056A 1988.01.16 |
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