CN101966574A - Low-pressure casting equipment for aluminum alloy circle patterns of tire mold and low-pressure casting and gravity feeding process - Google Patents
Low-pressure casting equipment for aluminum alloy circle patterns of tire mold and low-pressure casting and gravity feeding process Download PDFInfo
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- CN101966574A CN101966574A CN 201010523985 CN201010523985A CN101966574A CN 101966574 A CN101966574 A CN 101966574A CN 201010523985 CN201010523985 CN 201010523985 CN 201010523985 A CN201010523985 A CN 201010523985A CN 101966574 A CN101966574 A CN 101966574A
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- 238000005266 casting Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 20
- 230000005484 gravity Effects 0.000 title claims description 8
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 4
- 239000010440 gypsum Substances 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 18
- 229910052782 aluminium Inorganic materials 0.000 description 18
- 239000007788 liquid Substances 0.000 description 16
- 239000004411 aluminium Substances 0.000 description 15
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses low-pressure casting equipment for the aluminum alloy circle patterns of a tire mold, comprising a crucible and a liquid-lifting pipe. A disc-type pouring substrate is arranged on the crucible, the lower end of the liquid-lifting pipe penetrates through a central hole of the pouring substrate and extends into the crucible, a casting substrate hermetically covers the pouring substrate and is provided with a casting outer mold, the upper end of the casting outer mold is provided with a shrink head, a casting inner cavity is provided with a pouring channel, the upper port of the liquid-lifting pipe penetrates through the pouring substrate and the casting substrate and is communicated with the pouring channel, stepped air chambers surrounding the pouring channel is arranged in the inner cavity of the casting outer mold at the periphery of the pouring channel and is provided with an air inlet nozzle and an air outlet nozzle, and the casting outer mold is made of steel ZG35 and provided with the three layers of stepped air chambers as well as an air chamber sealing plate, the air inlet nozzle and the air outlet nozzle at the periphery. In an inflating and cooling process, the stepped air chambers surrounding the periphery of the pouring channel can cool casts in an order set by the design requirements.
Description
Technical field:
The present invention relates to a kind of tire-mold aluminum alloy pattern ring low-pressure casting equipment and low-pressure casting, gravity feeding technology.
Background technology:
Aluminum alloy pattern ring is the vitals that is used for sulfidization molding tyre tread in the tire-mold.The processing mode of these parts, at present both at home and abroad widespread usage mainly contain following three kinds:
1, artistic carving: be applicable to load-carrying loose tool tool.
2, galvano-cautery technology: be applicable to load-carrying tire and riding loose tool tool.
3, aluminum alloy casting technique: be applicable to riding loose tool tool.
For the requirement of security, comfortableness and aesthetic property, riding tire Pattern Design is than load-carrying tire complexity, and the form accuracy of decorative pattern and dimension precision requirement are very high.Therefore, the main aluminum alloy casting technique that adopts of the pattern ring of mould processing.
At present, the aluminum alloy pattern ring casting technique, general have two kinds of low pressure casting and gravitational castings.Wherein, low pressure casting has casting density height, advantage that intensity is good, but because of tire-mold pattern ring volume is big, shape of product and size variation are various, to its technological requirement complexity, equipment and technical parameter determine be difficult to hold, very big to the influence of product qualified rate.Gravitational casting adopts block form processing more, and simple relatively with its technology controlling and process requirement, the advantage that product qualified rate is stable is occupied leading position at tire-mold aluminum alloy pattern ring casting field for a long time always.But because it is divided into some with pattern ring and processes, efficient is produced in influence in batches greatly; This technology also has the potential weakness that is difficult to avoid, the i.e. secondary pollution of aluminium liquid.So-called secondary pollution is meant through the purified aluminum liquid after the degasification refining, in the cast operation since with the contacting of air, continue to take place the process of air-breathing reaction.This is that under the effect of chemical affinity, the hydrogen molecule in the aqueous vapor condenses rapidly on aluminium liquid surface and is dissociated into hydrogen atom, and progressively to aluminium liquid diffusion inside, incorporates in the aluminium liquid with atom, ionic condition because contain a certain proportion of aqueous vapor in the air.Its reaction equation is as follows:
3H
2O+2AL＝AL
2O
3+3H
2
The AL that generates
2O
3With hydrogen molecule be pollution body the most serious in the aluminum solutions because AL
2O
3In case dissolve in the aluminium liquid, the castings material performance is brought adverse effect, the tendency that the hydrogen in the aluminium liquid then can make foundry goods form pore and shrinkage porosite in crystallization, when solidifying increases.
In the operation of gravitational casting, earlier with aluminium liquid through smart degasification, reach pouring temperature after, pour in the insulation casting ladle.With casting ladle core is poured into a mould again.Aluminium liquid has increased the probability that contacts with atmosphere in the process, thereby produces secondary pollution inevitably.For gravity foundry technology is insoluble weakness.
Summary of the invention:
For overcoming the defective of prior art, the object of the present invention is to provide a kind of tire-mold aluminum alloy pattern ring low-pressure casting equipment and low-pressure casting, gravity feeding technology, can solve the secondary pollution problem of aluminium liquid in the aluminum alloy pattern block gravity foundry technology, simultaneously the type stamen of monolithic can be assembled into whole mould stamen by the technology diameter and pour into a mould, help improving the production efficiency of cast.
Technical solution problem of the present invention adopts following technical scheme:
Tire-mold aluminum alloy pattern ring low-pressure casting equipment comprises crucible, stalk; The running channel substrate of disc type is set on described crucible, and described stalk lower end is passed and extends in the crucible from the centre bore of running channel substrate; Sealing is coated with the casting mold substrate on described running channel substrate, and described casting mold substrate is provided with the casting mold external mold, is provided with rising head in the upper end of described casting mold external mold, and the casting mold inner chamber is provided with running channel; The upper port of described stalk passes described running channel substrate and the casting mold substrate is communicated with described running channel; Mold cavity is provided with the staged air chamber around running channel outside the casting mold of described running channel periphery, and described staged air chamber has a suction nozzle and an outlet nozzle.
Design feature of the present invention also is:
Be provided with the crucible inlet channel in the described running channel substrate, described crucible inlet channel communicates with described crucible inner chamber.
The upper port of described stalk is provided with ceramic filter screen.
Utilizing present device to carry out tire-mold aluminum alloy pattern ring low-pressure casting is to carry out as follows:
A, determine casting technological parameter:
The casting mold external mold is preheated to 350 ℃, and the gypsum core is preheated to 110 ℃, casting mold basal plate preheating to 350 ℃, running channel basal plate preheating to 300 ℃; 710 ℃ of pouring temperatures; Fused solution fills type in crucible, stalk, running channel in ceramic filter screen enters the casting mold external mold;
B, mold filling pressure curve:
Phase I mold filling pressure 0.09bar in the steps A, filling velocity 0.003bar/s, filling time 30s; Second stage is filled the type pressure and is 0.2bar, filling velocity 0.002bar/s, filling time 100s; The phase III mold filling pressure is 0.3bar, and filling velocity is 0.004bar/s, and filling time is 70s; The 0.3bar that keep-ups pressure, release behind the pressurize 420s;
C, inflation cooling procedure:
Beginning charges into compressed air to described staged air chamber, duration 1800s behind the release 480s.
D, annealing process:
After inflation cooling stops, unloading casting mold external mold air cooling to the room temperature, the demoulding behind the 4h.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, with the type mode of filling of gravity foundry technology, changes low-pressure casting into, aluminium liquid is in casting process in the seal cavity all the time, do not contact with atmosphere by gravity-assist pouring.Avoided secondary pollution, the probability that foundry goods produces gas hole defect greatly reduces, and has therefore improved the accepted product percentage of cast product.
2, utilize the low pressure casting technical advantage, on pouring temperature and poring rate, can realize accurate control, make feeding process and the cooling velocity of producing the medium casting product in batches realize uniformity, can obtain shrinkage factor parameter accurately, effectively control the scale error and the form error of product, improved the machining accuracy of product.
3, pouring technology of the present invention has been used the low pressure casting technology, has created good working condition, has improved operating environment; Owing to adopt pattern ring cast-in-block mode, also improved production efficiency simultaneously.
4, the casting mold external mold is made by the ZG35 steel, is provided with shellring shape staged air chamber, the periphery has air chamber shrouding, suction nozzle, outlet nozzle, and in the inflation cooling procedure, the staged air chamber that is looped around the running channel periphery can make casting mold dispel the heat in proper order by setting requirement.
Description of drawings:
Fig. 1 is an aluminum alloy pattern ring low-pressure casting equipment structural representation of the present invention.
Fig. 2 is the structural representation of casting mold external mold in the casting equipment of the present invention.
Fig. 2 A is the structure chart of air chamber in the casting mold external mold; Be that C among Fig. 2 is to view.
Fig. 3 is a foundry goods condensation sequential schematic of the present invention.
Fig. 4 for the present invention at wheel loose tool patterned aluminum circle shape of product schematic diagram.
Number in the figure: 1 body of heater, 2 crucibles, 3 running channel substrates, 4 stalks, 5 casting mold substrates, 6 casting mold external molds, 7 running channels, 8 loam cakes, 9 rising heads, 10 gypsum cores, 12 outlet nozzles, 13 suction nozzles, 14 ceramic filter screen, 15 crucible inlet channels, 16 inlet plenum shroudings, 17 staged air chambers.
Below pass through the specific embodiment, and the invention will be further described in conjunction with the accompanying drawings.
The specific embodiment:
Embodiment: in conjunction with Fig. 1, the tire-mold aluminum alloy pattern ring low-pressure casting equipment of present embodiment comprises body of heater 1, crucible 2, stalk 4; The running channel substrate 3 of disc type is set on crucible 2, and the lower end of stalk 4 is passed and is extended in the crucible 2 from the centre bore of running channel substrate;
Sealing is coated with casting mold substrate 5 on running channel substrate 3, and casting mold substrate 5 is provided with casting mold external mold 6, is provided with rising head 9 in the upper end of casting mold external mold 6, and the casting mold inner chamber is provided with running channel 7;
The upper port of stalk 4 passes running channel substrate 3 and casting mold substrate 5 is communicated with running channel 7;
In conjunction with Fig. 2,2A, mold cavity is provided with the staged air chamber 17 around running channel outside the casting mold of running channel 7 peripheries, and described staged air chamber has a suction nozzle 13 and an outlet nozzle 12.
In specifically being provided with, be provided with crucible inlet channel 15 in the running channel substrate 3, crucible inlet channel 15 communicates with the crucible inner chamber.The upper port of stalk 4 is provided with ceramic filter screen 14.
Running channel substrate 3 is made after the destressing tempering by the 45# steel plate, be provided with crucible inlet channel 15, stalk 4 mounting grooves, with the alignment pin of casting mold substrate 5; Be used for installing and fixing of air inlet, stalk 4 and casting mold substrate 5.
Casting mold substrate 5 is made after the destressing tempering by the 45# steel plate, and thickness 100mm is contained in running channel substrate 3 tops, be provided with running channel and ceramic filter screen 14 mounting grooves and with the alignment pin of casting mold external mold 6; Be used for the in order heat radiation and ceramic filter screen 14 is installed and keeps watering the road junction and communicate of foundry goods condensation process with cast gate on stalk 4, the casting mold external mold 6.
Casting mold external mold 6 is by ZG35 steel prejudice Fig. 2, be provided with 3 layers of annular step ladder type air chamber 17, periphery have air chamber shrouding 16, suction nozzle 13 Φ 45, outlet nozzle 12 Φ 30, sprue gate and with the alignment pin of loam cake 8.Being used for condensation process dispels the heat in proper order by setting requirement.
With the high 80mm of A3 steel plate processing annulus framework, inner filling 30-40 molybdenum quartz sand is also installed exothermic riser 9 Φ 115*300 to upper cover plate 8 earlier; Be used for the feeding of foundry goods top seal and condensation process.
During concrete the cast, aluminium liquid rises along stalk under the pressure of setting, and rises to inner chamber until being full of casting mold by the running channel on filter screen and the casting mold external mold, sees Fig. 1.When aluminium liquid rises on rising head plane 40mm position, the beginning pressurize, the dwell time is 480 seconds.
The casting process medium casting is positioned at the crucible top, and the feeding process is to be undertaken by the rising head above the foundry goods.Therefore foundry goods to solidify order should be from inside to outside, from the bottom to top, feeding is carried out by rising head in the top of final set, order is: 1. → 2. → 3. → 4. → 5. → 6. → 7. see Fig. 3.Accomplish this point, the surface of foundry goods and internal soundness all can be guaranteed.
Because the particularity of mould structure, the wall thickness variation of pattern ring product is relatively large, and under the certain situation of same model outer profile size Φ D and B, internal diameter Φ C can have multiple variation according to tire specification.Make the scope of pattern ring wall thickness dimension M not wait, see Fig. 4 from 40-100mm.Therefore, the external mold of identical parameters and running channel are during the foundry goods of cast wall thickness more than 80mm, because aluminium liquid weight is many, thermal capacity is relatively large, cool time is long, causes the foundry goods condensation to occur in sequence variation, and cool off prior to foundry goods top at the rising head position, blocked the feeding passage, cause foundry goods top feeding deficiency, produce pore and shrinkage defect, cause when serious and scrap.Casting mold external mold of the present invention has the cooling air chamber, charges into compressed air before solidifying prior to the rising head position, to accelerate the foundry goods cooling velocity, guarantees that the condensation order carries out on request.
This casting process, aluminium liquid is in the airtight space all the time, has avoided the secondary pollution problem.After the release, the aluminium liquid in the stalk returns crucible, prepares cast next time.Be cast with to be beneficial to and enhance productivity because pattern ring is a disposable integral.
Utilizing present device to carry out tire-mold aluminum alloy pattern ring low-pressure casting carries out as follows:
A, determine casting technological parameter:
The casting mold external mold is preheated to 350 ℃, and gypsum core 10 is preheated to 110 ℃, casting mold basal plate preheating to 350 ℃, running channel basal plate preheating to 300 ℃; 710 ℃ of pouring temperatures; Fused solution fills type in crucible, stalk, running channel in ceramic filter screen enters the casting mold external mold;
C, mold filling pressure curve:
Phase I mold filling pressure 0.09bar in the steps A, filling velocity 0.003bar/s, filling time 30s; Second stage is filled the type pressure and is 0.2bar, filling velocity 0.002bar/s, filling time 100s; The phase III mold filling pressure is 0.3bar, and filling velocity is 0.004bar/s, and filling time is 70s; The 0.3bar that keep-ups pressure, release behind the pressurize 420s;
C, inflation cooling procedure:
Beginning charges into compressed air to described staged air chamber, duration 1800s behind the release 480s.
D, annealing process:
After inflation cooling stops, unloading casting mold external mold air cooling to the room temperature, the demoulding behind the 4h.
Claims (4)
1. tire-mold aluminum alloy pattern ring low-pressure casting equipment comprises crucible, stalk;
The running channel substrate of disc type is set on described crucible, and described stalk lower end is passed and extends in the crucible from the centre bore of running channel substrate;
Sealing is coated with the casting mold substrate on described running channel substrate, and described casting mold substrate is provided with the casting mold external mold, is provided with rising head in the upper end of described casting mold external mold, and the casting mold inner chamber is provided with running channel; It is characterized in that:
The upper port of described stalk passes described running channel substrate and the casting mold substrate is communicated with described running channel;
Mold cavity is provided with the staged air chamber around running channel outside the casting mold of described running channel periphery, and described staged air chamber has a suction nozzle and an outlet nozzle.
2. tire-mold aluminum alloy pattern ring low-pressure casting equipment according to claim 1 is characterized in that, is provided with the crucible inlet channel in the described running channel substrate, and described crucible inlet channel communicates with described crucible inner chamber.
3. tire-mold aluminum alloy pattern ring low-pressure casting equipment according to claim 1 is characterized in that the upper port of described stalk is provided with ceramic filter screen.
4. technology of utilizing the described equipment of claim 1 to carry out tire-mold aluminum alloy pattern ring low-pressure casting, gravity feeding is characterized in that carrying out as follows:
A, determine casting technological parameter:
The casting mold external mold is preheated to 350 ℃, and the gypsum core is preheated to 110 ℃, casting mold basal plate preheating to 350 ℃, running channel basal plate preheating to 300 ℃; 710 ℃ of pouring temperatures; Fused solution fills type in crucible, stalk, running channel in ceramic filter screen enters the casting mold external mold;
Phase I mold filling pressure 0.09bar in the steps A, filling velocity 0.003bar/s, filling time 30s; Second stage is filled the type pressure and is 0.2bar, filling velocity 0.002bar/s, filling time 100s; The phase III mold filling pressure is 0.3bar, and filling velocity is 0.004bar/s, and filling time is 70s; The 0.3bar that keep-ups pressure, release behind the pressurize 420s;
C, inflation cooling procedure:
Beginning charges into compressed air to described staged air chamber, duration 1800s behind the release 480s.
D, annealing process:
After inflation cooling stops, unloading casting mold external mold air cooling to the room temperature, the demoulding behind the 4h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105239858A CN101966574B (en) | 2010-10-27 | 2010-10-27 | Low-pressure casting equipment for aluminum alloy circle patterns of tire mold and low-pressure casting and gravity feeding process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105239858A CN101966574B (en) | 2010-10-27 | 2010-10-27 | Low-pressure casting equipment for aluminum alloy circle patterns of tire mold and low-pressure casting and gravity feeding process |
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| CN101966574A true CN101966574A (en) | 2011-02-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268949A (en) * | 2014-06-05 | 2016-01-27 | 住友橡胶工业株式会社 | Fragment casting method and casting equipment |
| CN105855511A (en) * | 2015-01-23 | 2016-08-17 | 河南金牌山模具有限公司 | Low-pressure casting segmented mold and method for casing aluminum alloy pattern ring through low-pressure casting segmented mold |
| CN106825500A (en) * | 2017-02-20 | 2017-06-13 | 永固集团股份有限公司 | A kind of mould filter and the low pressure casting die with the filter |
| CN110899665A (en) * | 2019-12-30 | 2020-03-24 | 重庆长安汽车股份有限公司 | Low-pressure casting method suitable for multi-layer complex-structure casting |
| CN113967729A (en) * | 2021-10-22 | 2022-01-25 | 贵州航天风华精密设备有限公司 | Double-compensation interrupted antigravity pouring system and pouring method for aluminum alloy casting |
| WO2023010742A1 (en) * | 2021-08-04 | 2023-02-09 | 苏州明志科技股份有限公司 | Low-pressure mold filling gravity feeding device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110899665B (en) * | 2019-12-30 | 2021-04-06 | 重庆长安汽车股份有限公司 | Low-pressure casting method suitable for multi-layer complex-structure casting |
| WO2023010742A1 (en) * | 2021-08-04 | 2023-02-09 | 苏州明志科技股份有限公司 | Low-pressure mold filling gravity feeding device and method |
| CN113967729A (en) * | 2021-10-22 | 2022-01-25 | 贵州航天风华精密设备有限公司 | Double-compensation interrupted antigravity pouring system and pouring method for aluminum alloy casting |
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|---|---|
| CN101966574B (en) | 2012-02-15 |
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