CN103406514A - Method for centrifugally casting self-generated particle-reinforced cylinder sleeve - Google Patents
Method for centrifugally casting self-generated particle-reinforced cylinder sleeve Download PDFInfo
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Abstract
The invention discloses a method for centrifugally casting a self-generated particle-reinforced cylinder sleeve. The method comprises the steps of molten lava preparation, casting preheating, pouring mold-filling, centrifugal forming, speed-reducing shutdown and demolding cooling. The centrifugal forming step is performed under a magnetic field, the direction of the magnetic filed is vertical to or parallel to the direction of centrifugal casting axis, and the strength of the magnetic field is 0.02-1 T. The centrifugal rotating speed in the centrifugal forming step is 1000-4000 r/min. The centrifugal casting step is performed under the magnetic field, a centrifugal buoyancy force is applied to reinforced particles and the reinforced particles move towards the inner layer, an electromagnetic force is applied to un-solidified molten lava, and the electromagnetic force can prevent the problem that the reinforced particles are adhered and clustered radially under the effect of single centrifugal buoyancy force, so that the particles are more uniformly distributed in the inner layer, thus the bonding strength of the particles and base body is improved, and the mechanical property of the inner layer is improved.
Description
Technical field
The present invention relates to a kind of casting method, particularly the spontaneous particle of a kind of centrifugal casting strengthens the method for cylinder jacket.
Background technology
Cylinder jacket, piston, piston ring and cylinder head form the combustion chamber of internal combustion engine jointly.Fuel mixture is mechanical energy through air inlet, compression, burning and expansion process by thermal power transfer in combustion chamber.During work, cylinder jacket directly contacts with high-temperature gas, is one of the most severe parts of working environment in internal combustion engine.
At present, the passenger car internal combustion engine adopts the cylinder jacket of cast iron materials more, the preparation moulding after again castingin in aluminium alloy cylinder.Although it is comparatively ripe to prepare the technique of cast iron cylinder cover, but the heat conductivity of cast iron, toughness and Aluminum Alloy Cylinder Barrel matching are poor, in use procedure, cylinder body and cylinder sleeve bond strength easily reduce, cause both in conjunction with not tight, cause the problems such as engine cylinder-body leakage of oil, gas leakage, infiltration, efficiency reduce, discharge exceeds standard.For these problems, development of new aluminium composite material cylinder jacket just become a kind of in the urgent need to.
Fig. 1 is the schematic diagram that prior art is manufactured the aluminium composite material cylinder jacket.Add man-hour, to contain the molten slurry 2 of the aluminium that strengthens particle 3 is poured in casting mold 1, under High Rotation Speed (centrifugal rotational speed the is ω) effect of casting mold 1, density is less than enhancing particle 3 radially inwardly moving along casting mold 1 under the centrifugal buoyancy F1 of aluminium solution effect of the molten slurry of aluminium, and finally rest on the internal layer of tubular cylinder jacket part, form internal layer and have the cylinder jacket that high-volume fractional strengthens particle.This cylinder jacket inner layer sheet reveals the characteristics that strengthen particle, i.e. high rigidity, high abrasion, high thermal stability; And outer characteristics with base aluminum, i.e. easily processing, good with the aluminium alloy cylinder matching.
But the cylinder jacket of this method manufacture also exists internal layer to strengthen particle agglomeration,, the easily shortcoming such as come off low with substrate contact intensity.Below in conjunction with accompanying drawing, this is described further, as shown in Figure 1, enhancing particle a, b, c are in different centrifugal radiuses, in the radial direction same.During the centrifugal casting mould High Rotation Speed, strengthen the centrifugal buoyancy F1 that particle a, b, c are subject to pointing to axle center, establish the centrifugal buoyancy F1 that a, b, c be subject to and be respectively Fa, Fb, Fc; Due to the radius difference, centrifugal buoyancy Fa > Fb > Fc, due to particle a, b, c, be not subjected to the effect of other power, strengthen the radial motion speed Va of particle a, b, c > Vb > Vc, and strengthening particle a and catch up with the most at last b and c, the three finally reunites in the radial direction bonding.Fig. 2 is the cross sectional representation of the method cast article, in figure, strengthen particle 3 and be gathered in a large number cylinder jacket internal layer 7, the content that strengthens particle in cylinder jacket skin 6 is few, but strengthens particle in cylinder jacket internal layer 7 non-uniform Distribution, but reunites along internal layer radial direction bonding.Due to the existence that this bonding is reunited, cause strengthening the problems such as particle and matrix material contact area reduce, contact strength reduces, easily come off, affect the stability of this cylinder sleeve performance.
Summary of the invention
In view of this, the invention provides the method that the spontaneous particle of a kind of centrifugal casting strengthens cylinder jacket, the enhancing particle of the cylinder jacket of the method casting is not reunited, with matrix, be combined well, and stable performance.
The spontaneous particle of centrifugal casting of the present invention strengthens the method for cylinder jacket, comprises the molten slurry of preparation, the casting mold preheating, and type is filled in cast, centrifugal forming, speed reducing stopping and demoulding cooling step, it is the particle reinforced aluminium-based cylinder jacket of primary crystal Si, primary crystal Mg that described spontaneous particle strengthens cylinder jacket
2The particle reinforced aluminium-based cylinder jacket of Si or primary crystal Si and primary crystal Mg
2The Si particle mixes enhancing aluminum based cylinder cover, and described centrifugal forming step is carried out under magnetic field, and the direction in this magnetic field is vertical or parallel with the centrifugal casting mould axis direction.
Further, in described casting mold preheating step, casting mold is non-magnet_conductible material.
Further, the intensity in described magnetic field is 0.02～1T.
Further, in the molten slurry of described preparation step, in molten slurry, primary crystal Si grain volume fraction is 5-15%, primary crystal Mg
2The Si grain volume fraction is 8-20%.
Further, in described centrifugal forming step, centrifugal rotational speed is 600～3000r/min.
Beneficial effect of the present invention is: centre spinning method of the present invention, and strengthen grain density and be less than the molten slurry of aluminium, be subject to pointing to the centrifugal buoyancy in axle center, constantly to the internal layer motion, form internal layer and have the gradient composite cylinder jacket that high-volume fractional strengthens particle.In addition, centrifugal forming step of the present invention is carried out in externally-applied magnetic field, and molten slurry is subject to the electromagnetic force opposite with the casting mold direction of rotation in the process of rotation, and this electromagnetic force makes the molten slurry in solidification front place produce speed discrepancy with solidifying part, thereby produces relative motion.This relative motion can be smashed the primary crystal particle (namely strengthening particle) of separating out from solidification front on the one hand, thereby refinement primary crystal particle avoids strengthening reunion and the adhesion of particle, improves the bond strength of particle and matrix; On the other hand, the eutectic structure of this relative motion in can also can the refinement matrix, avoid the eutectic structure of lath-shaped and cluster-shaped to occur, further improves comprehensive mechanics and the thermal property of cylinder jacket.
The accompanying drawing explanation
The invention will be further described below in conjunction with drawings and Examples;
Fig. 1 is prior art centre spinning method schematic diagram;
Fig. 2 is prior art centrifugal casting product cross sectional representation;
Fig. 3 is centre spinning method schematic diagram of the present invention;
Fig. 4 is centrifugal casting product cross sectional representation of the present invention;
Fig. 5 is a kind of structural representation of centrifugal casting apparatus of the present invention;
Fig. 6 is the another kind of structural representation of centrifugal casting apparatus of the present invention;
Fig. 7 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 1; In figure, realize representing rotating speed and time relationship, dotted line represents intensity and time relationship;
Fig. 8 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 2; In figure, realize representing rotating speed and time relationship, dotted line represents intensity and time relationship;
Fig. 9 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 3, in figure, realizes representing rotating speed and time relationship, and dotted line represents intensity and time relationship;
Figure 10 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 4, in figure, realizes representing rotating speed and time relationship, and dotted line represents intensity and time relationship;
Figure 11 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 5 and 7, in figure, realizes representing rotating speed and time relationship, and dotted line represents intensity and time relationship;
Figure 12 is centrifugal rotational speed and the graph of a relation of magnetic field intensity and time in the embodiment of the present invention 6, in figure, realizes representing rotating speed and time relationship, and dotted line represents intensity and time relationship.
Wherein: 1 is casting mold, and 2 are molten slurry, and 3 for strengthening particle, and 4 for solidifying part, and 5 is solidification front, 6 is the cylinder jacket skin, and 7 is the cylinder jacket internal layer, and 8 is magnetic pole, and 9 are push pedal, and 10 is that baffle plate, 11 is solenoid, ω is centrifugal rotational speed, and B is magnetic line of force direction, and F1 is centrifugal buoyancy, and F2 is electromagnetic force.
The specific embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 3 is the schematic diagram of centre spinning method of the present invention, centrifugal casting mould 1 of the present invention is made by non-magnetic material (as copper alloy, stainless steel, graphite etc.), compared to Figure 1, outside centrifugal casting mould 1 of the present invention, also be provided with the external magnetic field perpendicular to centrifugal casting mould 1 axis.Centre spinning method of the present invention, strengthen the centrifugal buoyancy F1 that particle 3 is subject to pointing to axle center, constantly to the internal layer motion, forms internal layer and have the composite cylinder jacket that high-volume fractional strengthens particle 3.In addition, centrifugal forming step of the present invention is carried out in externally-applied magnetic field, molten slurry 2 is subject to the electromagnetic force F2 opposite with casting mold 1 direction of rotation in the process of rotation, this electromagnetic force F2 makes the molten slurry 2 in solidification front 5 places produce speed discrepancy with solidifying part 4, thereby produces relative motion.This relative motion can be smashed the primary crystal particle (namely strengthening particle 3) of separating out from solidification front 5 on the one hand, thereby refinement primary crystal particle avoids strengthening reunion and the adhesion of particle 3, improves the bond strength of particle and matrix; On the other hand, the eutectic structure of this relative motion in can also can the refinement matrix, avoid the eutectic structure of lath-shaped and cluster-shaped to occur, further improves comprehensive mechanics and the thermal property of cylinder jacket.Fig. 3 a is coagulation forming schematic diagram in early stage, and this period, same enhancing particle a, b, c radially mainly did as centripetal motion at centrifugal buoyancy F1.Fig. 3 b is coagulation forming later stage schematic diagram, this is that internal layer has been assembled a large amount of enhancing particles 3, part particle mutually reunite (a, b, c particle in figure), after when solidification front 5, moving to the position at a particle place, reunion enhancing particle a, b and c together, under the effect of molten slurry 2 and the relative motion of having solidified part 4, be separated from each other, thereby guaranteed that enhancing particle 3 is uniformly distributed at cylinder jacket internal layer 7.
Fig. 4 is the cross sectional representation of the cylinder jacket manufactured of the present invention, in figure, strengthens particle 3 and mainly is gathered in cylinder jacket internal layer 7, extremely low at outer 6 content of cylinder jacket, and strengthens particle 3 and be separated from each other at cylinder jacket internal layer 7, without the bonding phenomenon of reuniting.
Fig. 5 is the structure of centrifugal casting apparatus of the present invention, comprise casting mold 1, baffle plate 10, push pedal 9, described casting mold 1 is outer also is provided with at least one pair of magnetic pole 8, and the magnetic line of force direction of described magnetic pole 8 is perpendicular to casting mold 1 axis, and the magnetic field that described magnetic pole 8 produces can effectively cover centrifugal casting mould 1.
Fig. 6 is the structure of the another kind of centrifugal casting apparatus of the present invention, and it only is that with the difference of Fig. 5 centrifugal casting mould 1 its magnetic field produces by being looped around the outer solenoid of casting mold 1 11, and the magnetic line of force direction B of solenoid generation is parallel with casting mold 1 axis.It should be noted that, although the direction of above-mentioned two kinds of centrifugal casting mould magnetic lines of force is different, it is equivalent strengthening particle 3 suffered electromagnetic force F2 direction and size variation rule in two kinds of magnetic fields, can select as required suitable type.
In following examples, all select the device of magnetic field shown in Figure 5 perpendicular to the centrifugal casting mould axis: embodiment 1-4 is the Preparation Example of the particle reinforced aluminium-based cylinder jacket of primary crystal Si, and embodiment 5,6 is primary crystal Mg
2The Preparation Example of the particle reinforced aluminium-based cylinder jacket of Si, embodiment 7 is primary crystal Si and Mg
2The Si hybrid particles strengthens the Preparation Example of aluminum based cylinder cover.
Embodiment 1:
The present embodiment centrifugal casting particle strengthens the method for cylinder jacket, comprise the following steps: 1, the molten slurry of preparation: take commercial-purity aluminium and Si is raw material, preparation primary crystal particle Si volume fraction is 10% the molten slurry of Al-Si composite, and the temperature while controlling molten slurry cast is 720 ℃; 2, preheating casting mold: before cast, casting mold is carried out to preheating, in the present embodiment, the casting mold preheat temperature is 300 ℃; 3, type is filled in cast: the molten slurry of the composite of step 1 preparation is poured in the casting mold of step 2 preheating uniformly, and the present embodiment duration of pouring is 5s, and during cast, centrifugal rotational speed increases gradually, while being poured, reaches 2000r/min; 4, centrifugal forming: cast is filled after type finishes and is melted slurry coagulation forming under centrifugal force and magnetic field volume effect, and the present embodiment centrifugal forming time is 255s, and the centrifugal speed perseverance is 2000r/min, and magnetic field is the magnetic field of intensity 0.3T; 5, speed reducing stopping: after centrifugal forming finishes, stop applying magnetic field, close by setup program centrifuge simultaneously, the time in this stage is got over 10s; 6, the demoulding is cooling: take out step 5 products obtained therefrom air cooling cooling.
In the present embodiment, the relation of centrifugal rotational speed, externally-applied magnetic field and time as shown in Figure 7, adopt this moulding process, the existence in magnetic field is all arranged in whole centrifugal forming process, from solidifying, electromagnetic force just hinders the rotation of molten slurry, has reduced the rotary speed of molten slurry, thereby causes the centrifugal buoyancy of particle to reduce, centripetal motion is slack-off, and internal layer enhancement layer grain volume fraction is relatively low.But this moulding process is to the eutectic Si in matrix and eutectic Mg
2The Si tissue has significant thinning effect, with single centrifugal forming, compares, and the sharp corners rust of the internal layer primary crystal Si particle of product prepared by this moulding process, adhesion and agglomeration disappear substantially; The eutectic Si of the former strip that (comprises skin and internal layer) in matrix is transformed into corynebacterium; The mechanical property of inside and outside layer material all increases.
Embodiment 2:
The relation of the present embodiment centrifugal rotational speed, externally-applied magnetic field and time as shown in Figure 8.The difference of the present embodiment and embodiment 1 is, when the cast of the present embodiment step 3 was filled type and finished, centrifugal speed reached 3000r/min; During step 4 centrifugal forming, the centrifugal speed perseverance is 3000r/min, and magnetic field is the magnetic field of intensity 1T, and externally-applied magnetic field is opened in the final stage of centrifugal forming.The present embodiment applies magnetic field in the final stage of centrifugal forming, and at this moment most primary crystal Si particle segregations are to internal layer, and magnetic field only internal layer tissue exerts an influence, on not impact of outer tissue.The volume fraction that particle prepared by the present embodiment strengthens cylinder jacket internal layer primary crystal Si particle reaches 30%, and particle diameter is 20～30 μ m; The corner angle of primary crystal Si particle disappear fully, and be evenly distributed, without adhesion and agglomeration, and that the eutectic Si in the internal layer matrix changes into fully is a little spherical, with embodiment 1, to compare, its internal layer mechanical property improves greatly, and in the outer tissue forming process, due to the intervention that there is no magnetic field, its tissue topography compares with single centrifugal forming with mechanical property, without significant change.
Embodiment 3:
The relation of the present embodiment centrifugal rotational speed, externally-applied magnetic field and time as shown in Figure 9.The difference of the present embodiment and embodiment 1 is, when the cast of the present embodiment step 3 was filled type and finished, centrifugal speed reached 2000r/min; During step 4 centrifugal forming, the centrifugal speed perseverance is 2000r/min, and magnetic field is the magnetic field of intensity 1T, and the ascending increase of externally-applied magnetic field intensity.In the early stage of moulding, be mainly to strengthen the process of particle to the internal layer motion, and at this moment less magnetic field intensity can guarantee that molten slurry has enough rotary speeies and particle that enough centripetal movement velocitys are arranged; The moulding later stage, most of particle moved to internal layer, now increasing magnetic field, can guarantee that internal layer produces enough mixing effects.The volume fraction that the prepared particle of the present embodiment strengthens cylinder jacket internal layer primary crystal Si particle reaches approximately 25%, and particle diameter is 30～40 μ m; The corner angle of internal layer primary crystal Si particle disappear, and without adhesion, agglomeration, the eutectic Si structural transformation in matrix becomes point spherical; With embodiment 2, compare, its internal layer mechanical property decreases, but outer mechanical property strengthens.
Embodiment 4:
The relation of the present embodiment centrifugal rotational speed, externally-applied magnetic field and time as shown in figure 10.The difference of the present embodiment and embodiment 1 is, centrifugal speed in type and step 4 centrifugal forming is filled in the cast of the present embodiment step 3 to be increased gradually, and centrifugal forming finishes to reach maximum 3000r/min; During step 4 centrifugal forming, the magnetic field intensity perseverance is 0.5T.The present embodiment magnetic field intensity is definite value, and in early stage, centrifugal rotational speed is lower, and electromagnetic force is less; In the later stage, centrifugal radius reduces, and increases centrifugal rotational speed, increases electromagnetic force, can guarantee the mixing effect of internal layer.The volume fraction of the present embodiment products obtained therefrom internal layer primary crystal Si particle reaches approximately 23%, and particle diameter is 30～40 μ m; Inside and outside layer microstructure is with approaching with performance and embodiment 3.
Embodiment 5:
The present embodiment centrifugal casting particle strengthens the method for cylinder jacket, comprises the following steps: 1, the molten slurry of preparation: at first take pure magnesium and industrial pure silicon prepares Mg as raw material
2Si primary crystal particle, then with Mg
2Si primary crystal particle and commercial-purity aluminium are raw material configuration Mg
2Si primary crystal grain volume fraction is 15% the molten slurry of composite, and the temperature while controlling molten slurry cast is 700 ℃; 2, preheating casting mold: before cast, casting mold is carried out to preheating, in the present embodiment, the casting mold preheat temperature is 300 ℃; 3, type is filled in cast: the molten slurry of step 1 preparation is poured in the casting mold of step 2 preheating uniformly, and the present embodiment duration of pouring is 5s, and during cast, centrifugal rotational speed increases gradually, while being poured, reaches 3000r/min; 4, centrifugal forming: cast is filled after type finishes and is melted slurry coagulation forming under centrifugal force and magnetic field volume effect, the present embodiment centrifugal forming time is 255s, the centrifugal speed perseverance is 3000r/min, and magnetic field intensity progressively increases in the centrifugal forming process, finally reach 0.5T(as shown in figure 11); 5, speed reducing stopping: after centrifugal forming finishes, stop applying magnetic field, close by setup program centrifuge simultaneously, the time in this stage is got over 10s; 6, the demoulding is cooling: take out step 5 products obtained therefrom air cooling cooling.
In the present embodiment, the relation of centrifugal rotational speed, externally-applied magnetic field and time as shown in figure 11, adopt this moulding process, the early stage of moulding, be mainly to strengthen the process of particle to the internal layer motion, at this moment less magnetic field intensity can guarantee that molten slurry has enough rotary speeies and particle that enough centripetal movement velocitys are arranged; The moulding later stage, most of particle moved to internal layer, now increasing magnetic field, can guarantee that internal layer produces enough mixing effects.The present embodiment product, internal layer primary crystal Mg
2The volume fraction of Si particle reaches approximately 55%, and particle diameter is 15～20 μ m; With single centrifugal forming, compare internal layer primary crystal Mg
2The corner angle of Si particle disappear, and without adhesion, agglomeration, are evenly distributed; The eutectic Mg of cluster-shaped in matrix
2Si organizes disappearance, is transformed into the spherical tissue of point that is uniformly distributed in aluminum substrate, and the mechanical property of ectonexine all is greatly improved.
Embodiment 6:
The relation of the present embodiment centrifugal rotational speed, externally-applied magnetic field and time as shown in figure 12.The difference of the present embodiment and embodiment 5 is, centrifugal speed in type and step 4 centrifugal forming is filled in the cast of the present embodiment step 3 to be increased gradually, and centrifugal forming finishes to reach maximum 3000r/min; Step 4 centrifugal forming magnetic field intensity is 0.2T.The present embodiment magnetic field intensity is definite value, and in early stage, centrifugal rotational speed is lower, and electromagnetic force is less; In the later stage, centrifugal radius reduces, and increases centrifugal rotational speed, can increase electromagnetic force, guarantees the mixing effect of internal layer.The volume fraction of the present embodiment products obtained therefrom internal layer primary crystal Si particle reaches approximately 45%, and particle diameter is 20～25 μ m.The internal layer microstructure morphology is all close to embodiment 3, and performance is a little less than embodiment 3.
Embodiment 7:
The present embodiment centrifugal casting particle strengthens the method for cylinder jacket, comprises the following steps: 1, the molten slurry of preparation: take pure magnesium and Si prepares primary crystal Si and Mg as raw material
2The Si particle, add the gained particle in the commercial-purity aluminium liquation that to form volume fraction be that (wherein the volumn concentration of primary crystal Si particle is 6%, primary crystal Mg for 15% compound molten slurry
2The volumn concentration of Si particle is 9%), controlling molten slurry pouring temperature is 710 ℃; 2, preheating casting mold: before cast, casting mold is carried out to preheating, in the present embodiment, the casting mold preheat temperature is 300 ℃; 3, type is filled in cast: the compound molten slurry of step 1 preparation is poured in the casting mold of step 2 preheating uniformly, and the present embodiment duration of pouring is 5s, and during cast, centrifugal rotational speed increases gradually, while being poured, reaches 3000r/min; 4, centrifugal forming: cast is filled after type finishes and is melted slurry coagulation forming under centrifugal force and magnetic fields, the present embodiment centrifugal forming time is 255s, the centrifugal speed perseverance is 3000r/min, and magnetic field intensity progressively increases in the centrifugal forming process, finally reach 0.5T(as shown in figure 11); 5, speed reducing stopping: after centrifugal forming finishes, stop applying magnetic field, close by setup program centrifuge simultaneously, the time in this stage is got over 10s; 6, the demoulding is cooling: take out step 5 products obtained therefrom air cooling cooling.The present embodiment products obtained therefrom internal layer primary crystal Si and primary crystal Mg
2The total volume fraction of Si particle reaches approximately 50%, and wherein the volumn concentration of primary crystal Si approximately 20%, and particle diameter is 30～40 μ m, primary crystal Mg
2The volumn concentration of Si particle approximately 30%, particle diameter is 15～20 μ m; The two microscopic pattern is mellow and full, at internal layer, is evenly distributed, without adhesion, agglomeration; Eutectic Si and eutectic Mg
2It is a little spherical that Si is, and divides equally and be distributed in matrix; With single centrifugal forming, compare, microstructure significantly improves and refinement, and mechanical property increases substantially.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, above-described embodiment emphasis on analyzing the impact on properties of product of centrifugal force and magnetic field temporal evolution and magnetic field load time, but this does not get rid of the load mode in other centrifugal force and magnetic field, the related personnel can make many variations as required.Those of ordinary skills can be according to actual needs to the centrifugal casting particle strengthen cylinder jacket technological parameter (as the size of magnetic field and centrifugal rotational speed and and time relationship, water temperature, mold temperature etc.), raw material types and content carries out various adjustment.For example, by adjusting kind, ratio and the centrifugal molding process of cylinder jacket matrix and enhancing particle, the particle that can prepare other kinds strengthens cylinder jacket, and can realize that enhancement layer is the controlled design of the distribution of cataclysm gradient, enhancement layer thickness; By adjusting matrix and strengthening composition, the centrifugal casting technique of particle or take follow-up rotten treatment process, can realize strengthening the controlled design of particle diameter; By in matrix, adding trace alloying element (Cu, Ni, Mn, Ti etc.), can realize the adjustment of non-enhancement layer mechanical performance.Above various change, as long as in its centrifugal casting process, there is externally-applied magnetic field to exist, all belong to protection scope of the present invention.
Claims (5)
1. the method for the spontaneous particle enhancing of a centrifugal casting cylinder jacket, comprise the molten slurry of preparation, the casting mold preheating; type is filled in cast; centrifugal forming, speed reducing stopping and demoulding cooling step is characterized in that: it is the particle reinforced aluminium-based cylinder jacket of primary crystal Si, primary crystal Mg that described spontaneous particle strengthens cylinder jacket
2The particle reinforced aluminium-based cylinder jacket of Si or primary crystal Si and primary crystal Mg
2The Si particle mixes enhancing aluminum based cylinder cover, and described centrifugal forming step is carried out under magnetic field, and the direction in this magnetic field is vertical or parallel with the centrifugal casting mould axis direction.
2. the spontaneous particle of centrifugal casting strengthens the method for cylinder jacket as claimed in claim 1, and it is characterized in that: in described casting mold preheating step, casting mold is non-magnet_conductible material.
3. the spontaneous particle of centrifugal casting strengthens the method for cylinder jacket as claimed in claim 1, and it is characterized in that: the intensity in described magnetic field is 0.02～1T.
4. the spontaneous particle of centrifugal casting strengthens the method for cylinder jacket as claimed in claim 1, and it is characterized in that: in the molten slurry of described preparation step, in molten slurry, primary crystal Si grain volume fraction is 5-15%, primary crystal Mg
2The Si grain volume fraction is 8-20%.
5. particle as spontaneous as centrifugal casting as described in any one in claim 1-5 strengthens the method for cylinder jacket, and it is characterized in that: in described centrifugal forming step, centrifugal rotational speed is 600～3000r/min.
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| CN106191641A (en) * | 2016-06-30 | 2016-12-07 | 中原内配集团安徽有限责任公司 | A kind of production method strengthening cylinder jacket |
| CN106282617A (en) * | 2016-08-30 | 2017-01-04 | 中原内配集团安徽有限责任公司 | A kind of production method oozing pottery aluminum alloyage cylinder jacket |
| CN106435340A (en) * | 2016-08-30 | 2017-02-22 | 中原内配集团安徽有限责任公司 | Method of producing cylinder sleeve with thread grooves uniformly distributed on excircle |
| CN109207748A (en) * | 2018-08-17 | 2019-01-15 | 清华大学 | A kind of forging forging technology of aluminium alloy slab preparation method and slab |
| CN112011707A (en) * | 2019-05-31 | 2020-12-01 | 南京理工大学 | Method for preparing gradient structure material through non-equilibrium solidification based on centrifugal force |
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| CN106282617A (en) * | 2016-08-30 | 2017-01-04 | 中原内配集团安徽有限责任公司 | A kind of production method oozing pottery aluminum alloyage cylinder jacket |
| CN106435340A (en) * | 2016-08-30 | 2017-02-22 | 中原内配集团安徽有限责任公司 | Method of producing cylinder sleeve with thread grooves uniformly distributed on excircle |
| CN109207748A (en) * | 2018-08-17 | 2019-01-15 | 清华大学 | A kind of forging forging technology of aluminium alloy slab preparation method and slab |
| CN109207748B (en) * | 2018-08-17 | 2020-05-19 | 清华大学 | Preparation method of aluminum alloy casting blank for forging and forging process of casting blank |
| CN112011707A (en) * | 2019-05-31 | 2020-12-01 | 南京理工大学 | Method for preparing gradient structure material through non-equilibrium solidification based on centrifugal force |
| CN112011707B (en) * | 2019-05-31 | 2022-02-15 | 南京理工大学 | Method for preparing gradient structure material through non-equilibrium solidification based on centrifugal force |
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| CN103406514B (en) | 2015-11-18 |
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