CN101432087A - Aluminum die cast product and process for manufacturing the same - Google Patents
Aluminum die cast product and process for manufacturing the same Download PDFInfo
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- CN101432087A CN101432087A CNA2007800015414A CN200780001541A CN101432087A CN 101432087 A CN101432087 A CN 101432087A CN A2007800015414 A CNA2007800015414 A CN A2007800015414A CN 200780001541 A CN200780001541 A CN 200780001541A CN 101432087 A CN101432087 A CN 101432087A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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Abstract
An aluminum die cast product such as a pressure container needing high airtightness that reduces the ratio of pressure leakage or gas leakage, realizing a yield enhancement; and a process for manufacturing the same. The aluminum die cast product is one having cast hole (2A) formed by means of core pin (5) in thick area (4) with thickness greater than in other areas, wherein the cast hole (2A) is provided on its surface with a given value or greater thickness of chill layer (2B) of at least 5.5 [mu]m or less dendrite secondary arm spacing.
Description
Technical field
The present invention relates to be fit to be used in aluminium die casting (die cast) goods and the manufacture method thereof of pressure vessel as compressor needs high-air-tightness etc.
Background technology
Know in aluminum die cast product, when casting forming, follow the solidification shrinkage of the motlten metal that is expelled to metal pattern, produce the solidification shrinkage space.Under the situation of aluminium alloy, about 6% volume contraction takes place when solidifying.Because be wrapped in product inside in this shrink space, this causes casting flaw.The wall thickness of casting station is thick more, and cooling velocity is more little, and shrinkage cavity is tended to more to wide scope expansion.
Usually, in cast product, because the cooling velocity of the part of the close face (casting surface) that contacts with metal pattern is fast, therefore, form the few zone of defective that is called as chilling layer at casting surface, but the cooling velocity of the inside of wall thickness is slow, therefore, because solidification shrinkage produces shrinkage cavity.This shrinkage cavity is in the majority with the situation of the form formation of three-dimensional extended.
For example, pressure vessel is under one the situation of compressor housing, is provided for sucking or sprays the port holes of refrigerant gas and installation at the wall thick wall part thicker than other parts of housing being used for screwed hole of assembling that pipe arrangement is connected with this port holes etc.With regard to these port holes and screwed hole, using the casting of casting the die-cast of pulling pin to pull out hole shape usually becomes hole down, does not have dimensional accuracy under the original state of casting, therefore, implements machining with the cutting output about 0.5mm usually.
At this moment, although do not have defective at casting surface, beautiful in appearance, but shrinkage cavity defect takes place as described above in inside sometimes, therefore, if the thickness in zone that does not have shrinkage cavity defect is less than cutting output, then shrinkage cavity defect is exposed in the cutting face after machining, causes connecting between the inside and outside or port holes of housing and the screwed hole by this shrinkage cavity defect sometimes.This is to cause pressure leakages or refrigerant gas leakage reasons, becomes the big factor of reduction as the yield rate of goods.
On the other hand, method as the generation that suppresses the shrinkage cavity in the thick wall part, knowing has (for example, with reference to patent documentation 1) such as pressurized method or local cooling methods, and the experience aspect is also known by strengthening the situation that local cooling can suppress the generation of shrinkage cavity defect.
[patent documentation 1] spy opens communique 2004-No. 223610
[patent documentation 2] spy opens flat 9-No. 323149 communiques
As mentioned above, recognized that for those of ordinary skills local reinforcement of cooling off is effective situation when suppressing the generation of shrinkage cavity defect.
Yet, concerning present situation, to when suppressing the generation of shrinkage cavity defect, how to strengthen cooling, utilize the reinforcement of cooling will not have the zone of shrinkage cavity defect to form which kind of degree, the dependency relation of the growth of the dendrite branch the when reinforcement of cooling and motlten metal solidification shrinkage how, or growth how to control the dendrite branch just do not become the shrinkage cavity defect etc. of the reason of pressure leakages or gas leakage may not be clear and definite, when being desirably in manufacturing and needing the pressure vessel etc. of high-air-tightness as compressor housing, reduce pressure leakages or gas leakage rate, can improve the establishment of technology of the yield rate of goods.
Summary of the invention
The present invention makes in view of such situation, and its purpose is to be provided in the aluminum die cast products such as pressure vessel that need high-air-tightness, can reduce pressure leakages or gas leakage rate, can improve the aluminum die cast product and the manufacture method thereof of its yield rate.
In order to address the above problem, aluminum die cast product of the present invention and manufacture method thereof adopt following scheme.
Promptly, aluminum die cast product of the present invention, its at wall than the thick thick wall part utilization of other parts casting (Casting order I ピ Application of pulling pin) be formed with casting and pull out the hole, it is characterized in that, be provided with the secondary dendrite arm on the surface that the hole is pulled out in described casting and be spaced apart chilling layer below at least 5.5 μ m.
Experiment by the inventor etc. is found: by strengthening local cooling, the growth of the dendrite when suppressing the motlten metal solidification shrinkage, its secondary dendrite arm is made as under the situation more than the 5.5 μ m at interval at least, can be formed in the chilling layer that casting surface is not separated out the shrinkage cavity defect of the reason that becomes pressure leakages or gas leakage.In the present invention, casting pulling pin shaping casting in utilization pulls out in the aluminum die cast product in hole, the surface colour of pulling out the hole in casting is drawn the secondary dendrite arm and is spaced apart chilling layer below at least 5.5 μ m, therefore, even being pulled out hole shape, this casting becomes hole down, shrinkage cavity defect can not expose on its surface yet, can suppress to pull out via casting the generation of the pressure leakages or the gas leakage in hole reliably.Thereby, when making pressure vessel etc., can increase substantially its yield rate.
Also have, the secondary dendrite arm be meant at interval adjacent secondary dendrite arm in the heart distance, arrange secondary dendrite arm mean value at interval in the part more than four continuously as the secondary dendrite arm.Specifically, select the part of secondary dendrite arm arrangement more than four, measure the interval 1 of secondary dendrite arm n at interval (n is more than 4) degree, obtain 1/ (n-1).Measure more than three places, the addition of getting its result is average.
And then aluminum die cast product of the present invention is characterized in that in above-mentioned aluminum die cast product, and the thickness that described secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m pulls out the machining amount in hole greater than predefined described casting.
According to the present invention as can be known, the thickness that the secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m pulls out the machining amount in hole greater than predefined casting, therefore, even casting is pulled out the hole as following hole machining, also its machined surface can be accommodated in the secondary dendrite arm that shrinkage cavity defect does not take place and be spaced apart in the scope of the chilling layer below the 5.5 μ m.Thereby shrinkage cavity defect can not expose at the machining face, can suppress reliably to pull out hole portion directly or the situation of pressure leakages or gas leakage takes place via the screwed hole that is adjacent etc. from casting.
And then aluminum die cast product of the present invention is characterized in that in above-mentioned aluminum die cast product after the machining of carrying out with described machining amount, it is residual that described secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m.
According to the present invention as can be known, after the machining of carrying out with the machining amount, residual secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m, therefore, in the goods after machining, the chilling layer of shrinkage cavity defect can not take place at the remained on surface that the hole is pulled out in casting.Thereby, preventing that reliably shrinkage cavity defect from exposing at the machining face, can suppress reliably to pull out hole portion directly or the situation of pressure leakages or gas leakage takes place via the screwed hole that is adjacent etc. from casting.
And then aluminum die cast product of the present invention is characterized in that in above-mentioned any aluminum die cast product the thickness that described secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m is made as at least more than the 0.5mm.
According to the present invention as can be known, the thickness that the secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m is made as at least more than the 0.5mm, therefore, can make the secondary dendrite arm be spaced apart the thickness of the following chilling layer of at least 5.5 μ m greater than the machining amount that is set at the aluminum die cast product below the 0.5mm usually.Thus, can the casting after machining pull out the residual reliably chilling layer that shrinkage cavity defect does not take place in surface in hole.Thereby shrinkage cavity can not exposed at the machining face, can suppress reliably to pull out hole portion directly or the situation of pressure leakages or gas leakage takes place via the screwed hole that is adjacent etc. from casting.
And then aluminum die cast product of the present invention is characterized in that in above-mentioned any aluminum die cast product described aluminum die cast product is a pressure vessel.
According to the present invention as can be known, aluminum die cast product is a pressure vessel, therefore, can form from casting and pull out the pressure vessel that situation that aperture revealed by shrinkage cavity defect generation internal flow does not take place.Thereby, when making aluminium die casting pressing pressure container, increase substantially its yield rate, can obtain high-quality pressure vessel with low cost.
And then aluminum die cast product of the present invention is characterized in that in above-mentioned aluminum die cast product described pressure vessel is a compressor housing.
According to the present invention as can be known, pressure vessel is the housing of compressor, therefore, can form and pull out aperture from casting and by shrinkage cavity defect the compressor housing that the situation of the leakage of inner refrigerant gas does not take place takes place.Thereby, when making aluminium die casting pressing pressure container, increase substantially its yield rate, can obtain high-quality compressor housing with low cost.
In addition, the manufacture method of aluminum die cast product of the present invention, it is to pull pin in the wall thick wall part utilization casting thicker than other parts to form the manufacture method that the aluminum die cast product in hole is pulled out in casting, it is characterized in that, by making cooling medium in the described casting middle circulation of pulling pin, the hole is pulled out in the described casting of local cooling, forms the secondary dendrite arm and be spaced apart chilling layer below at least 5.5 μ m more than surface that the hole is pulled out in this casting is with certain thickness.
According to the present invention as can be known, when casting forming, make cooling medium to the casting middle circulation of pulling pin, the Cooling Ability of Partial that raising is pulled pin based on casting, thermograde in the time of can increasing the motlten metal solidification shrinkage thus, therefore, suppress the growth of dendrite, more than surface that the hole is pulled out in casting is with certain thickness, form the secondary dendrite arm and be spaced apart chilling layer below at least 5.5 μ m.Thereby even use casting to pull out hole conduct hole down, shrinkage cavity defect can not expose on its surface, can suppress to pull out via casting the generation of the pressure leakages or the gas leakage in hole reliably, and, when making aluminium die casting pressing pressure container, increase substantially its yield rate.
And then, the manufacture method of aluminum die cast product of the present invention is in the manufacture method of above-mentioned aluminum die cast product, it is characterized in that, described casting is pulled pin and is used the casting of inserting the sleeve structure of central tube in main body is pulled pin in the casting of hollow to pull pin, supply with described cooling medium by this central tube to the casting leading section of pulling pin, make described cooling medium to described central tube and the intersubjective cooling medium stream circulation of described pin, thereby the hole is pulled out in the described casting of local cooling.
According to the present invention as can be known, casting is pulled pin and is used the casting of inserting the sleeve structure of central tube in main body is pulled pin in the casting of hollow to pull pin, supply with cooling medium by this central tube to the casting leading section of pulling pin, make cooling medium to described central tube and the intersubjective cooling medium stream circulation of pin, therefore, can on full week, form the cooling medium stream equably, can make the stream stabilisation of cooling medium, and, can local equably cooling casting pull out the hole.Thus, can be spaced apart chilling layer below at least 5.5 μ m forming the secondary dendrite arm more than equably with certain thickness reliably in full week on surface that the hole is pulled out in casting.Thereby, make the stay in grade of the aluminum die cast product of casting, can its yield rate of bar.
And then the manufacture method of aluminum die cast product of the present invention is characterized in that in the manufacture method of above-mentioned aluminum die cast product described cooling medium circulates with the flow more than the 12cc/s.
According to the present invention as can be known, cooling medium circulates with the flow more than the 12cc/s, therefore, thermograde when suppressing the motlten metal solidification shrinkage fully, suppress the growth of dendrite, can more than surface that the hole is pulled out in casting is with certain thickness, form the secondary dendrite arm thus reliably and be spaced apart chilling layer below at least 5.5 μ m.
And then, the manufacture method of aluminum die cast product of the present invention is in the manufacture method of above-mentioned aluminum die cast product, it is characterized in that, described casting is pulled pin to use in the casting of the hollow casting that body interior inserts the diaphragm structure of dividing plate vertically of pulling pin and is pulled pin, supply with described cooling medium from the side's that separates by described dividing plate cooling medium stream, make of the cooling medium stream circulation of described cooling medium, thereby the hole is pulled out in the described casting of local cooling to described the opposing party.
According to the present invention as can be known, casting is pulled pin to use in the casting of the hollow casting that body interior inserts the diaphragm structure of dividing plate vertically of pulling pin and is pulled pin, supply with cooling medium from the side's that separates by dividing plate cooling medium stream, make the cooling medium stream circulation of cooling medium to the opposing party, therefore, can form the cooling medium stream equably, can make the stream of cooling medium stable, and, can improve cooling capacity.Thus, can more than surface that the hole is pulled out in casting is with certain thickness, form the secondary dendrite arm reliably and be spaced apart chilling layer below at least 5.5 μ m.Thereby, make the stay in grade of the aluminum die cast product of casting, can its yield rate of bar.
And then the manufacture method of aluminum die cast product of the present invention is characterized in that in the manufacture method of above-mentioned aluminum die cast product, when the injection with motlten metal finishes or the injection of motlten metal described cooling medium is gone into circulation before finishing to face.
According to the present invention as can be known, when finishing with the injection of motlten metal or the injection of motlten metal cooling medium is gone into circulation before finishing to face, therefore, can the sub-cooled metal pattern and cause that the motlten metal bad grade that flows exerts an influence to the injection of motlten metal, and quenching when can finish with injection.Thus, the thermograde when increasing motlten metal and being solidification shrinkage can be discharged and recharged, the growth of dendrite can be suppressed.Thereby, can more than surface that the hole is pulled out in casting is with certain thickness, form the secondary dendrite arm reliably and be spaced apart chilling layer below at least 5.5 μ m.
According to aluminum die cast product of the present invention and manufacture method thereof as can be known, can more than surface that the hole is pulled out in casting is with certain thickness, form the secondary dendrite arm reliably and be spaced apart chilling layer below at least 5.5 μ m.Therefore, be made as down the hole even the hole is pulled out in casting, shrinkage cavity defect can not expose on its surface yet, can suppress to pull out via casting the generation of the pressure leakages or the gas leakage in hole reliably.In addition, when making pressure vessel etc., improve its yield rate, can make high-quality aluminum die cast product with low cost.
Description of drawings
Fig. 1 is the stereoscopic figure of the compressor housing of one of aluminum die cast product of one embodiment of the present invention.
Fig. 2 is that the Y-Y of compressor housing shown in Figure 1 is to pseudosection.
Fig. 3 is the local summary section of the die-cast state of compressor housing shown in Figure 1.
Fig. 4 is the profile of the example that is applicable to that the casting of the die-cast of compressor housing shown in Figure 1 is pulled pin.
Fig. 5 is another the routine profile that is applicable to that the casting of the die-cast of compressor housing shown in Figure 1 is pulled pin.
Schematic diagram when Fig. 6 is the solidification shrinkage of the motlten metal under the little situation of the thermograde of metal pattern cooling.
Schematic diagram when Fig. 7 is the solidification shrinkage of the motlten metal under the big situation of the thermograde of metal pattern cooling.
Fig. 8 utilizes DAS to measure the observation figure of the light microscope of usefulness.
Fig. 9 is the chart of relation of the thickness t (mm) in expression cooling water flow V (cc/s) and no shrinkage cavity defect zone.
Figure 10 is the chart of expression from the relation of the depth d (mm) of peeling face of assert shrinkage cavity and DAS (μ m).
Among the figure: 1-compressor housing; 2-port holes; The hole is pulled out in 2A-casting; 2B-chilling layer; 4-thick wall part; 5,50-casting is pulled pin; 5A-pin main body; 5E-centrepin; 5F, 50I, 50J-cooling medium stream; 50E-demarcation strip; 20-dendrite branch; 21-secondary dendrite arm; DAS-secondary dendrite arm at interval.
The specific embodiment
Below, with reference to accompanying drawing, one embodiment of the present invention is described.
The stereogram of the compressor housing 1 in the one embodiment of the present invention has been shown among Fig. 1, and Y-Y that Fig. 1 has been shown among Fig. 2 is to pseudosection.Also having, in the present embodiment, about aluminum die cast product, be that compressor housing 1 is that example describes with a kind of of the bubble-tight pressure vessel of needs, but aluminum die cast product of the present invention is not limited to this.
Above-mentioned port holes 2 is set to connect compressor housing 1 as shown in Figure 2, and this port holes 2 is connected with the illustrated refrigerant piping of omission.
Above-mentioned compressor housing 1 forms and is used for light-weighted aluminium alloy system, utilizes the die-cast manufacturing.In addition, the following hole of port holes 2 and screwed hole 3 (following hole) when die-cast, utilize the casting pull pin form the casting pull out hole 2A and 3A, machining is that given size is carried out fine finishining behind die-cast.
Fig. 3 shows to utilize and casts the summary section that the state of hole 2A and 3A die-cast is pulled out in 5 and 6 castings that will be used for port holes 2 and screwed hole 3 of pulling pin.Utilize fixing metal mould 7 and movable metal pattern 8, form the formingspace 9 that the thick wall part 4 of hole 2A and 3A is pulled out in the casting that is shaped.For this formingspace 9, the casting that is shaped is pulled out the casting of hole 2A and 3A and pull pin 5 and 6 from the 7 side-prominent configurations of fixing metal mould.During die-cast, by fill motlten metal in above-mentioned formingspace 9, utilization is cast 5 and 6 castings that become the following hole of port holes 2 and screwed hole 3 of pulling pin and is pulled out hole 2A and 3A.
The thick wall part 4 that is provided with port holes 2 and screwed hole 3 forms than other part wall thickness, when die-cast, follows the solidification shrinkage of motlten metal, and the solidification shrinkage space takes place, and shrinkage cavity defect takes place easily in inside.As mentioned above, hole 2A is pulled out in 5 and 6 castings that are shaped and 3A fine finishining is port holes 2 and screwed hole 3 to utilize casting to pull pin, therefore, if the chilling layer 2B of its casting surface of cutting, then shrinkage cavity defect exposes sometimes in the cutting face, causes sometimes connecting between the inside and outside or port holes 2 of compressor housing 1 and the screwed hole 3 via this shrinkage cavity defect.This becomes pressure in the compressor housing 1 or refrigerant gas to outside leakage reasons as mentioned above.
In order to prevent the leakage of this pressure or refrigerant gas, the chilling layer 2B that shrinkage cavity defect will not take place at casting surface forms more than the certain thickness, makes to utilize the machining amount machining of stipulating, shrinkage cavity defect does not expose in its cutting face yet.And then, think forming with the thickness more than the machining amount when chilling layer 2B of shrinkage cavity defect does not take place that to pull out the hole be effective in local cooling casting to utilize casting to pull pin.Pull pin in 5 and 6 in above-mentioned casting, pull pin 6 pin self of screwed hole 3 usefulness castings is thin, be difficult to be provided with the stream of cooling medium in inside, therefore, in pull pin 5 inside of the thicker casting of configured ends oral pore 2 stream that cooling medium (water) is flow through is set, strengthen to utilize pull pin 5 Cooling Ability of Partial of casting, make it possible to increase the thickness in the zone (chilling layer 2B) that shrinkage cavity defect does not take place.
Pull pin 5 structure of casting that inside is provided with the stream of cooling medium (water) has been shown among Fig. 4.Cast 5 castings that form sleeve structure of pulling pin and pull pin 5, it comprises: the pin main body 5A that forms hollow; The fixator 5C that links via the top of screw 5B and pin main body 5A; Be screwed into the 5D of stopple portion of the end of fixator 5C; One end remains on the separating part up and down in the fixator 5C, and the other end is at the central tube 5E of the leading section opening of the pin main body 5A inside of hollow; Be formed between the pin main body 5A and central tube 5E of hollow, make the cooling medium stream 5F of cooling medium (water) circulation; The cooling medium supply pipe 5G that is connected with upper space in the fixator 5C; The cooling refrigeration agent discharge pipe 5H that is connected with lower space in the fixator 5C.Cooling medium (water) can be via cooling medium supply pipe 5G and cooling refrigeration agent discharge pipe 5H, with the stream set in this casting circulation in 5 of pulling pin.
Also have, above-mentioned casting is pulled pin and 5 can be pulled pin by casting shown in Figure 5 and 50 replace.It 50 is to replace pull pin 5 central tube 5E of casting with demarcation strip 50E that this casting is pulled pin, to form cooling medium supply side stream 50I by pull pin 50 sides' that separate stream of casting, the opposing party's stream is formed cooling medium discharges the casting of the partition plate structure of effluent road 50J and pulls pin, it is 5 identical that other structures and casting are pulled pin, the mark same-sign is omitted explanation.
Then, pull pin 5 or 50 to using above-mentioned casting, the structure that forms the method for the chilling layer 2B more than the certain thickness that shrinkage cavity defect does not take place on the surface of pulling out hole 2A as the casting in the following hole of port holes 2 and possess the compressor housing 1 of this chilling layer 2B describes.At first, the growth of the dendrite branch when motlten metal as Figure 6 and Figure 7 is solidification shrinkage and the relation of thermograde are described.
As Figure 6 and Figure 7, motlten metal solidify be between the dendrite branch 20 that extends from the solid phase side to replenish mode progress time of following the volume contraction of solidifying from liquid side supply motlten metal.For fear of solidification shrinkage space (shrinkage cavity) takes place, need be to 20 in dendrite branch supply motlten metal fully, therefore, the growth that suppresses dendrite branch 20 is most important.That is, if dendrite branch 20 growth, then supply motlten metal fully sometimes during this period produces the solidification shrinkage space X (with reference to Fig. 6) that becomes shrinkage cavity.
The growth of dendrite branch 20 can increase thermograde G and suppress by improving the cooling capacity of metal pattern side.Thermograde G can be by as shown in the formula expression.
G＝(T
L—T
s)/L
In above-mentioned formula, T
LBe liquidus temperature, T
sBe solidus temperature, L is the length of dendrite branch 20.
If thermograde G little (situation of Fig. 6), then dendrite branch 20 growths, its length L is elongated.On the other hand,, suppress the growth of dendrite branch 20, its length L can be shortened to L2 (L1〉L2) by increasing thermograde G (situation of Fig. 7).
In addition, by increasing thermograde G, can reduce the interval (dentritearm spacing (below, be called (DAS)) of secondary dendrite arm 21.This DAS as shown in Figure 8, solidify end after, can use light microscope easily to confirm.DAS be adjacent secondary dendrite arm in the heart distance, arrange secondary dendrite arm mean value at interval in the part more than four continuously as the secondary dendrite arm.Specifically, select the part of secondary dendrite arm arrangement more than four, measure the interval 1 of secondary dendrite arm n at interval (n is more than 4) degree, obtain 1/ (n-1).Measure more than three places, the addition of getting its result is average.
The said temperature gradient G improves the cooling capacity of metal pattern side more, can increase more.Thereby, think that as long as increase the flow of the cooling medium of cool metal mould improve the cooling velocity of metal pattern, the growth of the dendrite branch 20 when suppressing to solidify just can reduce DAS, can increase the thickness in the zone (chilling layer 2B) that shrinkage cavity does not take place.Therefore, carried out following experiment.
In the experiment, use casting shown in Figure 4 to pull pin 5, when changing the flow V (cc/s) of cooling medium (water), utilize casting to pull pin 5 and 6, die-cast is used for the casting of port holes 2 and screwed hole 3 and pulls out hole 2A and 3A (with reference to Fig. 3), utilize the DAS (μ m) of linear intercepting (linear intercept) method mensuration, and mensuration there is not the thickness t (mm) in the zone (chilling layer 2B) of shrinkage cavity defect from the prescribed depth position of peeling face (casting surface).Measurement result is as described in Table 1.
[table 1]
Also have, the casting condition in above-mentioned is as follows, and molten metal temperature is 665 ℃, and the metal pattern temperature is 200 ℃, and injection speed is 0.2m/s when low speed, is 2.3m/s during high speed.This casting condition equates for 150 ℃～300 ℃ with 640 ℃～690 ℃ of molten metal temperatures, metal pattern temperature as the common molding condition of aluminium die casting system housing 1.In addition, make condition that cooling medium (water) flows through be when finishing with injection simultaneously, the circulation of cooling medium (water) is begun, will be made as the currency for 3 seconds.
Analyze above-mentioned experimental result, among Fig. 9 with the concerning pictorialization of thickness t (mm) in the flow V (cc/s) of cooling medium (water) and no shrinkage cavity defect zone and illustrate.Thick solid line shown in Figure 9 has connected the minimum of a value of the thickness t (mm) in the no shrinkage cavity defect zone under each cooling water flow V (cc/s), as can be known clear and definite from its result, by being increased in the cooling water flow V (cc/s) that casting is pulled pin and flow through in 5, improve to utilize pull pin 5 cooling capacity of casting, increase the thermograde G when solidifying, can increase the thickness t (mm) in no shrinkage cavity defect zone.Especially confirm, by cooling water flow V (cc/s) is made as more than the 12.0cc/s, the thickness t (mm) that can make no shrinkage cavity defect zone is more than 0.8 (mm).
In addition, will assert the depth d (mm) of peeling face (casting surface) of shrinkage cavity and the concerning pictorialization of DAS (μ m) among Figure 10 certainly and illustrate.As can be known clear and definite, the zone of thick solid line as shown in figure 10 shows in the formed products when each the cooling water flow V (cc/s) that dots, assert that certainly the depth d (mm) of the peeling face (casting surface) of each shrinkage cavity promptly becomes the thickness (t in no shrinkage cavity defect zone
Min) the zone, can with should the zone as the threshold value (5.5～6.9 μ m) of the DAS that assert shrinkage cavity, the condition that the DAS of shrinkage cavity does not take place is below the 5.5 μ m.
From as can be known above-mentioned, as long as the growth of the dendrite when suppressing the motlten metal solidification shrinkage, be made as at least below the 5.5 μ m with DAS9 secondary dendrite arm at interval), just can be in compressor housing 1, the chilling layer 2B (with reference to Fig. 2) of shrinkage cavity that does not become the reason of pressure leakages or gas leakage is formed more than the certain thickness.
In the present embodiment, forming DAS on utilize casting to pull pin surface that the casting of port holes 2 usefulness of 5 castings pulls out hole 2A with the thickness of the processing capacity during machining after greater than die-cast is chilling layer 2B below the 5.5 μ m.That is, the machining amount being made as under the situation of common 0.5mm, is that chilling layer 2B below the 5.5 μ m forms the thickness more than the 0.5mm with DAS, is chilling layer 2B below the 5.5 μ m at the residual DAS in its cutting face after the machining.
Thus, casting is pulled out hole 2A as hole use down, even with common cutting output machining, shrinkage cavity defect can not expose in its cutting face yet, can prevent to pull out via casting the generation of pressure leakages or the gas leakage of hole 2A reliably.Thereby, when making compressor housing 1, increase substantially its yield rate, can make high-quality compressor housing 1 with low cost.
Especially, the year the return to the homeland flow V (cc/s) of the cooling medium (water) that flows through in 5 pulling pin in casting of vomiting is made as more than the 12.0cc/s, can make DAS is that the thickness t (mm) in the following no shrinkage cavity defect zone of 5.5 μ m becomes more than 0.8 (mm), can reliability eliminate pressure leakages or the big generation of gas leakage.
Also have, in the above-described embodiment, when die-cast, pull pin 5,50 for casting, when finishing, cooling medium is gone into circulation with the injection of motlten metal, but may not be simultaneously, before the injection of motlten metal finished to face, for example, the 1 second degree that finishes from injection began to make before the cooling medium circulation also can.In a word, if cooling medium is let alone, or from not too beginning to make the cooling medium circulation period of morning, then cause the sub-cooled metal pattern, its part begins to solidify in motlten metal is filled, and it is bad etc. to cause that motlten metal flows, injection to motlten metal exerts an influence, therefore, so long as do not produce the scope of described influence, just can before finishing, injection make the cooling medium circulation.
In addition, in the above-mentioned embodiment example that the present invention is applicable to compressor housing 1 is illustrated, but the invention is not restricted to this, certainly be applicable to the aluminum die cast product of the wide scope headed by aluminium cylinder post with other pressure vessels or engine, the transmission case etc., also can eliminate the leakage of enclosing inner fluid in this case reliably.
Claims (11)
1. aluminum die cast product, it is pulled pin in the wall thick wall part utilization casting thicker than other parts and is formed with casting and pulls out the hole, it is characterized in that,
Be provided with the secondary dendrite arm on the surface that the hole is pulled out in described casting and be spaced apart chilling layer below at least 5.5 μ m.
2. aluminum die cast product according to claim 1 is characterized in that,
The thickness that described secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m pulls out the machining amount in hole greater than predefined described casting.
3. aluminum die cast product according to claim 2 is characterized in that,
After the machining of carrying out with described machining amount, residual have described secondary dendrite arm to be spaced apart the following chilling layer of at least 5.5 μ m.
4. according to each described aluminum die cast product in the claim 1～3, it is characterized in that,
The thickness that described secondary dendrite arm is spaced apart the following chilling layer of at least 5.5 μ m is made as at least more than the 0.5mm.
5. according to each described aluminum die cast product in the claim 1～4, it is characterized in that,
Described aluminum die cast product is a pressure vessel.
6. aluminum die cast product according to claim 5 is characterized in that,
Described pressure vessel is a compressor housing.
7. the manufacture method of an aluminum die cast product, it is to pull pin in the wall thick wall part utilization casting thicker than other parts to form the manufacture method that the aluminum die cast product in hole is pulled out in casting, it is characterized in that,
By making cooling medium in the described casting middle circulation of pulling pin, the local cooling in hole is pulled out in described casting, form secondary dendrite arm more than the certain thickness on the surface that the hole is pulled out in this casting and be spaced apart chilling layer below at least 5.5 μ m.
8. the manufacture method of aluminum die cast product according to claim 7 is characterized in that,
Described casting is pulled pin and is used the casting of inserting the sleeve structure of central tube in main body is pulled pin in the casting of hollow to pull pin, supply with described cooling medium by this central tube to the casting leading section of pulling pin, make described cooling medium to described central tube and the intersubjective cooling medium stream circulation of described pin, thereby the local cooling in hole is pulled out in described casting.
9. the manufacture method of aluminum die cast product according to claim 8 is characterized in that,
Described cooling medium circulates with the flow more than the 12cc/s.
10. the manufacture method of aluminum die cast product according to claim 7 is characterized in that,
Described casting is pulled pin to use in the casting of the hollow casting that body interior inserts the diaphragm structure of dividing plate vertically of pulling pin and is pulled pin, supply with described cooling medium from the side's that separates by described dividing plate cooling medium stream, make of the cooling medium stream circulation of described cooling medium, thereby the local cooling in hole is pulled out in described casting to described the opposing party.
11. the manufacture method according to each described aluminum die cast product in the claim 7～10 is characterized in that,
When finishing or before the injection of motlten metal will finish, described cooling medium is gone into circulation with the injection of motlten metal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP342909/2006 | 2006-12-20 | ||
| JP2006342909A JP4043502B1 (en) | 2006-12-20 | 2006-12-20 | Aluminum die-cast product and manufacturing method thereof |
| PCT/JP2007/068935 WO2008075491A1 (en) | 2006-12-20 | 2007-09-28 | Aluminum die cast product and process for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101432087A true CN101432087A (en) | 2009-05-13 |
| CN101432087B CN101432087B (en) | 2010-12-29 |
Family
ID=39124532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800015414A Expired - Fee Related CN101432087B (en) | 2006-12-20 | 2007-09-28 | Aluminum die cast product and process for manufacturing the same |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20090120538A1 (en) |
| EP (1) | EP2095895B1 (en) |
| JP (1) | JP4043502B1 (en) |
| CN (1) | CN101432087B (en) |
| CA (1) | CA2631229A1 (en) |
| WO (1) | WO2008075491A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057630A (en) * | 2015-07-31 | 2015-11-18 | 安徽得力汽车部件有限公司 | Oxygenating die-cast formation technology for aluminum die-casting part |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5020889B2 (en) * | 2008-05-26 | 2012-09-05 | 株式会社豊田中央研究所 | Al alloy die casting and method for producing the same |
| JP2019125410A (en) * | 2018-01-19 | 2019-07-25 | 日本電産株式会社 | Housing for disk driving device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243620B (en) * | 1990-03-27 | 1994-06-29 | Atsugi Unisia Corp | Improvements in and relating to forming aluminium-silicon alloy |
| JPH09277014A (en) * | 1996-04-10 | 1997-10-28 | Hitachi Metals Ltd | Production of light alloy die cast product using resin core and hollow light alloy die cast product |
| JP3748622B2 (en) | 1996-06-03 | 2006-02-22 | 本田技研工業株式会社 | Casting pin structure of casting mold |
| JP4633972B2 (en) * | 2001-07-17 | 2011-02-16 | 住友電気工業株式会社 | Wear-resistant aluminum alloy elongated body, manufacturing method thereof, and piston for car air conditioner |
| JP2004223610A (en) | 2003-01-21 | 2004-08-12 | Kyosan Hirota | Method for manufacturing die cast product and apparatus for manufacturing the same |
| JP2004225134A (en) * | 2003-01-24 | 2004-08-12 | Showa Keigokin Kk | Aluminum alloy material for diesel engine cylinder head, production method therefor, and diesel engine |
| JP2004330273A (en) * | 2003-05-09 | 2004-11-25 | Sanden Corp | Method for casting piston |
| CN1254328C (en) * | 2003-05-16 | 2006-05-03 | 西北工业大学 | Coating with variational heat content and spreading method utilized in chill casting for aluminum alloy thin wall part |
| JP4290024B2 (en) * | 2004-01-26 | 2009-07-01 | 古河スカイ株式会社 | Compressor impeller made of cast aluminum alloy for turbochargers with excellent heat resistance |
| EP1808621A1 (en) * | 2004-11-01 | 2007-07-18 | Kabushiki Kaisha Toyota Jidoshokki | Pressure container, compressor and casting method of cylinder block |
-
2006
- 2006-12-20 JP JP2006342909A patent/JP4043502B1/en not_active Expired - Fee Related
-
2007
- 2007-09-28 CA CA002631229A patent/CA2631229A1/en not_active Abandoned
- 2007-09-28 EP EP07828677A patent/EP2095895B1/en not_active Not-in-force
- 2007-09-28 WO PCT/JP2007/068935 patent/WO2008075491A1/en active Application Filing
- 2007-09-28 CN CN2007800015414A patent/CN101432087B/en not_active Expired - Fee Related
-
2008
- 2008-05-30 US US12/155,170 patent/US20090120538A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057630A (en) * | 2015-07-31 | 2015-11-18 | 安徽得力汽车部件有限公司 | Oxygenating die-cast formation technology for aluminum die-casting part |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4043502B1 (en) | 2008-02-06 |
| WO2008075491A1 (en) | 2008-06-26 |
| CA2631229A1 (en) | 2008-06-20 |
| EP2095895A1 (en) | 2009-09-02 |
| CN101432087B (en) | 2010-12-29 |
| EP2095895B1 (en) | 2013-03-06 |
| US20090120538A1 (en) | 2009-05-14 |
| JP2008149369A (en) | 2008-07-03 |
| EP2095895A4 (en) | 2011-12-28 |
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