CN1105301A - Casting technique for producing piston of Al-base ceramic composite material - Google Patents
Casting technique for producing piston of Al-base ceramic composite material Download PDFInfo
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- CN1105301A CN1105301A CN 93115277 CN93115277A CN1105301A CN 1105301 A CN1105301 A CN 1105301A CN 93115277 CN93115277 CN 93115277 CN 93115277 A CN93115277 A CN 93115277A CN 1105301 A CN1105301 A CN 1105301A
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- aluminium
- silicon carbide
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Abstract
The piston made of Al-base ceramic composite is compounded through mixing ZL108 alloy as base material with granular SiC as ceramic additive in ratio of 88-92%:8-12% and use of stirring compact method or suspension pouring basin method. Obtained piston is suitable for high-speed and high-power engine.
Description
The invention belongs to casting technology field, mainly be applicable to the internal combustion engine material, it is the aluminium alloy third generation product of exploitation after high silicon piston.
As piston material, China's research is started late, piston manufacturer now is in hypereutectic aluminium piston (also the claiming high silicon piston) trial production, this just seriously influences the raising and the development of internal combustion engine quality level, and only have a few countries studying composite material piston abroad, its objective is in order to produce the higher internal combustion engine of inherent quality and presentation quality, because this production technology difficulty height and technical know-how are to China's technical merit in this respect still is in a backward condition.
At this situation, in order to work out the distinctive high-caliber composite material piston production technology of China, the present invention proposes a kind of casting production process of piston of Al-base ceramic composite material, the realization of this invention, piston high temperature, short time intensity is doubled than pot type piston, reach 180N/mm
2, and linear expansion coefficient has reduced by 50%, reaches 1.04 * 10
-5Wearability improves twice, the service life of piston is greater than 4000 hours, and piston of Al-base ceramic composite material not only can satisfy the supporting technology requirement of introducing and designing engine of new generation voluntarily, and requires at a high speed for exploitation adapts to the international market: the high output engine piston has been opened wall road.It can also substitute forging aluminium alloy in addition, titanium alloy, cast iron, cast steel etc.And be suitable for high-power, the requirement of small size, no water-cooled high temperature, high efficience motor.
The present invention selects for use zl108 alloy as matrix material, and it is the silicon carbide micro-powder particle that pottery adds material, by its SiC(8～12%)+ZL(88～92%) proportioning, be composited through stirring the compound or suspension beaker method of appearance method.
The concrete with reference to the accompanying drawings below overall process of setting forth invention:
Fig. 1 is for stirring appearance method set composite schematic diagram:
1, agitator 2, crucible cover 3, crucible 4, body of heater 5, argon gas inlet
Fig. 2 waters the cup device schematic diagram for suspending:
1, suspension is watered cup 2, SiC micro mist funnel 3, casting mold 4, obstruction 5, insulation material 6, argon gas inlet 7, is drawn running channel
One, composite material piston composition
Matrix material is selected zl108 alloy (GB1173～86) for use, and it is the silicon carbide micro-powder particle that pottery adds material, and the micro powder granule diameter is 10～15um, and its proportioning is: SiC(8～12%)+and ZL108(88～92%).
Two, composite material piston casting production process
Technological process is: and 720 ℃～740 ℃ of zl108 alloy meltings are rotten-and 740 ℃～760 ℃ materials of refining are compound-cast.
The key of composite material piston casting technique is that silicon carbide micro-powder and aluminium water are compound well; in compound this road technology of material, adopt leaching by agitation and suspended pouring method, the effect that obtains is more satisfactory; because the easy oxidation of aluminium liquid, the material recombination process all needs argon shield.Below narrate the concrete recombination process of leaching by agitation and suspended pouring method respectively:
1, leaching by agitation is compound
Leaching by agitation is compound to be after water-soluble clear, rotten, the refining treatment of aluminium finishes, and the silicon carbide micro-powder of preheating is added aluminium water, under argon shield, in crucible, stir molten, as shown in Figure 1.The aluminium coolant-temperature gage is controlled at about 750 ℃, agitator speed 1400rpm, mixing time 1.5～20 minutes.The cast of can uncapping after stir finishing, 300 ℃ of casting mold preheat temperatures require watering using up in the short time.If the midfeather time is grown (above 15 minutes), should build lid and stir again.
Because it is molten that silicon carbide micro-powder directly stirs in aluminium water, long time of contact with aluminium water, the ratio of SiC is unrestricted in the composite.Worth prompting a bit is that this kind complex method aluminium liquid can not be placed for a long time, on producing certain degree of difficulty is arranged.
2, suspension beaker composite algorithm
It is to be provided with one to suspend and to water cup above the casting mold cast gate that a glass composite algorithm is watered in suspension, as shown in the figure, used aluminium liquid in watering cup vortex and the underbalance effect that produces sucks silicon carbide micro-powder voluntarily and stirs.
When adopting this method, aluminium water is identical with normal smelting, and temperature is controlled at about 750 ℃, suspends to water the cup argon shield.The preheat temperature of the casting mold and the cup that suspends is 300～350 ℃, with the silicon carbide micro-powder adding funnel of about 500 ℃ of preheatings, pushes obstruction during cast aside, and aluminium water sucks micro mist.
The cast that suspends is not subjected to the restriction of aluminium water resting period length, easy and simple to handle, the production efficiency height, be suitable for the continuous production of piston, owing in cast, add micro mist, when easily causing the temperature of aluminium water to reduce to use this method, pouring temperature is suitably higher, simultaneously, the addition of micro mist is difficult for big, is generally about 10%.
Three, composite material piston process for machining
Process for machining is by the production line design, and technological process is:
Blank-Che seam-heavy boring pin-and-hole-rough turn outer garden-outer the garden of the rough turn cup groove-precision bored hole-Che back stop slot-pin-and-hole press polish-finish turning cup groove-finish turning-outer garden-quality inspection of mill-finished product.
Composite material piston adds man-hour, and is very fast to the wearing and tearing of cutter, adopts all steel stone cutter and YWZ hard to close full cutter in the production, and simultaneously, last cylindrical processing adopts grinding to carry out, and piston area slightly degree of making is 0.8.
Can find out from above overall process of the present invention, its advantage is the composite material piston that (1) casting is produced, elevated temperature strength is closed full piston than ZL108 and is enhanced about more than once, wearability improves 2 times, it is eutectic and the substitute products of crossing brilliant aluminium-silicon alloy piston that thermal coefficient of expansion significantly reduces (2) composite material piston, and it succeed in developing is for replace imported, the development of domestic high-engine, and promote the technology of whole Piston Industry to improve all significant.
Claims (3)
1, a kind of composite that is used for engine piston, its characteristics are that it is to select for use the ZL alloy as matrix material, the silicon carbide micro-powder particle adds material as pottery, and press it: the proportioning of SiC (8～12%)+ZL108 (88～92%) is composited through stirring appearance method or suspended pouring method.
2, according to the said composite of claim 1; it is characterized in that stirring the appearance method compound is after aluminium is water-soluble clearly, rotten, refining treatment finishes; the silicon carbide micro-powder of preheating is added aluminium water; under the protection of argon gas, in crucible, stir moltenly, the aluminium coolant-temperature gage is controlled at 750 ℃; agitator speed is 1400rpm; mixing time is the cast of can uncapping after stirring in 1.5～20 minutes finishes, and 300 ℃ of casting mold preheat temperatures require to have watered at short notice.If the midfeather time long (surpassing 15 clocks), should build lid and stir again.
3, according to the said composite of claim 1, it is characterized in that suspended pouring method compound be above the casting mold cast gate, to be provided with one to suspend and to water cup, the underbalance effect that used aluminium liquid produces watering glass mesoscale eddies is with the free suction of silicon carbide micro-powder and stir.When adopting this method, aluminium water is identical with normal molten refining, and temperature is controlled at 750 ℃; the cup argon shield is watered in suspension, and 300～350 ℃ of the preheat temperatures of the casting mold and the cup that suspends are with 500 ℃ of preheatings; silicon carbide silicon powder with about 500 ℃ of preheatings adds funnel in addition; push obstruction during cast aside, aluminium water sucks silicon carbide micro-powder, owing to add micro mist in the cast; easily cause the aluminium coolant-temperature gage to reduce; therefore pouring temperature suitably improves, and the addition of silicon carbide micro-powder is difficult for being generally 10% greatly simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93115277 CN1105301A (en) | 1993-12-23 | 1993-12-23 | Casting technique for producing piston of Al-base ceramic composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93115277 CN1105301A (en) | 1993-12-23 | 1993-12-23 | Casting technique for producing piston of Al-base ceramic composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1105301A true CN1105301A (en) | 1995-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93115277 Pending CN1105301A (en) | 1993-12-23 | 1993-12-23 | Casting technique for producing piston of Al-base ceramic composite material |
Country Status (1)
| Country | Link |
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| CN (1) | CN1105301A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075562C (en) * | 1998-12-25 | 2001-11-28 | 北京航空材料研究院 | Foamed silicon carbide particle reinforced aluminium base composite material and its producing technology |
| CN103484707A (en) * | 2013-09-23 | 2014-01-01 | 同济大学 | Preparation method for SiC particle reinforced aluminum-based composite material |
| CN108015259A (en) * | 2016-11-14 | 2018-05-11 | 江苏兄弟活塞有限公司 | A kind of inlay casting method of aluminum-based in-situ composite materials piston |
-
1993
- 1993-12-23 CN CN 93115277 patent/CN1105301A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075562C (en) * | 1998-12-25 | 2001-11-28 | 北京航空材料研究院 | Foamed silicon carbide particle reinforced aluminium base composite material and its producing technology |
| CN103484707A (en) * | 2013-09-23 | 2014-01-01 | 同济大学 | Preparation method for SiC particle reinforced aluminum-based composite material |
| CN108015259A (en) * | 2016-11-14 | 2018-05-11 | 江苏兄弟活塞有限公司 | A kind of inlay casting method of aluminum-based in-situ composite materials piston |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |