CN1618550A - Method for producing light-alloy casting - Google Patents

Abstract

This method includes; a preparation process for preparing a mold constituting a cavity with a sand mold for forming a riser section and a metallic mold for forming a part of the cavity by setting apart from the riser section; a casting process for pouring molten light alloy into the cavity; a separation process for separating the metal mold after a casting is formed by pouring; a quenching process for quenching the casting by bringing a cooling medium into contact with the surface of the casting removed from the metal mold; and an aging process of covering the casting with the sand mold and a heat keeper so that the whole casting is kept at an aging temperature for a predetermined period of time by using the heat which is kept by a riser section. To provide a method for producing a light alloy casting, in which T6 treatment is applied without needing any heat treatment furnace (or aging furnace) and the sufficient improvement in mechanical properties, such as tensile strength, of a product is attained.

Description

The manufacture method of light-alloy casting

Technical field

The present invention relates to use the manufacture method of the light-alloy casting of casting mold Birmasil, magnesium alloy etc.

Background technology

In general, aluminium alloy system foundry goods or magnesium alloy system foundry goods are that purpose is implemented heat treatment with the mechanical property that improves intensity etc.

As above-mentioned heat treatment, it is effective that T6 handles (implementing the heat treatment that the artificial age-hardening handles after the solution treatment).The T6 of aluminium alloy system foundry goods handles, and for example implements about 500 ℃ after 8～10 hours the solution treatment, and the age-hardening of implementing under the temperature about 180 ℃ 5～10 hours is handled.This age-hardening is handled owing to aluminium alloy system foundry goods is held in the heating furnace (aging furnace) and is carried out, so, need also exist the problem that reduces production efficiency, increases energy consumption as the heating furnace of heat-treatment furnace certainly.

Method as using casting mold Birmasil system foundry goods for example has, No. the 3068185th, Japan Patent (No. the 5297611st corresponding, United States Patent (USP), reach No. the 5477906th, patent) the disclosed following method of communique.

Promptly, using the casting mold that constitutes by metal mold and sand mold, the cylinder block castings of Birmasil system V-type engine, the part that this casting mold is corresponding with the combustion chamber side of cylinder block is to be to be made of sand mold by metal mold, other parts, at the die cavity that constitutes by these metal molds and sand mold and emit between the oral area, the cross gate via sealing mechanism is installed.With molten aluminium alloy by cross gate, open state sealing mechanism and emit oral area.Pour into a mould in from the below toward die cavity.Then, inaccessible sealing mechanism will be by the whole upset of the foundry goods that metal mold and sand mold constitute.After this liquation solidified, first SEPARATION OF GOLD genotype used liquid cooling medium to cool off the foundry goods face of this separating part, and it is bestowed the method that aeoplotropism is solidified.

Yet therefore the disclosed method casting mold integral body of need overturning in this patent exist the complicated problem of casting device, again, solution treatment (quenching) that this method is implemented for the casting back and Ageing Treatment without any record and enlightenment.So,, exist the problem that can not obtain sufficient mechanical property for example to the intensity of aluminium alloy system foundry goods.

In addition, other method in the past also has, and a kind of as Japanese publication communique spy opens the method that is disclosed for flat 8-225903 number, that is, with molten aluminium alloy with the casting exert pressure filling more than the 49MPa in metal mold, it is solidified; After solidifying end, from metal mold, take out and be immersed in immediately in the water, implement to quench; After the quenching, implement the method that artificial aging is handled.

This method is a method of all using metal mold to cast, and above-mentioned heat treatment (Quenching Treatment, age-hardening handle) is the processing of taking out from metal mold behind the goods (foundry goods).Therefore when implementing the artificial aging processing, must need aging furnace, inferring can increasing energy consumption.

Summary of the invention

, the objective of the invention is to for this reason, a kind of manufacture method of light-alloy casting is provided, solve the problem points that exists in the conventional art of enumerating in the above.

The manufacture method of light-alloy casting of the present invention is characterised in that, may further comprise the steps: the casting mold that has sand mold and metal mold, wherein, described sand mold have the part corresponding with rising head (below, sometimes abbreviate " emitting oral area " as), described metal mold is to leave described corresponding with the rising head described casting mold that partly is configured in, and is formed the die cavity of described casting mold by described sand mold and metal mold; Cast light-alloy liquation in the die cavity of described casting mold; Separate described metal mold from light-alloy casting; Make surface (below, abbreviate " release surface " sometimes as) contact of the foundry goods after cooling medium and the described SEPARATION OF GOLD genotype, thereby Quenching Treatment is bestowed on described surface; And the heat that utilizes described rising head to have, described foundry goods is bestowed the Ageing Treatment of stipulated time.

By the present invention, under the situation of heat-treatment furnace (aging furnace), can implement T6 and handle, can obtain the light-alloy casting of the mechanical property excellence of hot strength etc.

With reference to accompanying drawing,, can make above-mentioned and other purpose of the present invention, detailed content and advantage clearer by reading detailed description described below.

Description of drawings

Fig. 1 is the casting mold profile of corresponding one embodiment of the invention, is the casting mold that expression is made of metal mold and sand mold.

Fig. 2 is manufacturing process's flow chart of corresponding the present invention the 1st embodiment.

Fig. 3 is the casting mold profile behind the cast light-alloy liquation.

Fig. 4 is the casting mold cutaway view after the light-alloy liquation solidifies.

Fig. 5 is the casting mold profile after metal mold is separated.

Fig. 6 is the exposing surface that maintenance has the foundry goods of sand mold to former state, the profile when cooling off rapidly.

Fig. 7 is in order to carry out Ageing Treatment, to be coated with the profile of the foundry goods of sand mold and heat-insulation unit.

After Fig. 8 separates metal mold, the temperature variation at each position of foundry goods.

Fig. 9 is the comparison diagram of each hot strength of the foundry goods made of the present invention the 1st embodiment and foundry goods in the past.

Figure 10 is the foundry goods of the present invention the 1st embodiment manufacturing and the respectively comparison diagram of 0.2% yield strength of foundry goods in the past.

Figure 11 is the comparison diagram of each elongation at break of the foundry goods made of the present invention the 1st embodiment and foundry goods in the past.

Figure 12 is manufacturing process's flow chart of corresponding the present invention the 2nd embodiment.

Figure 13 is the foundry goods that former state is kept having sand mold, the profile when cooling off rapidly.

Figure 14 is the foundry goods that former state is kept having sand mold, the profile when slowly cooling off.

Figure 15 is in order to carry out Ageing Treatment, to be coated with the profile of the foundry goods of sand mold and heat-insulation unit.

Figure 16 is the temperature variation at each position of foundry goods after expression separates metal mold.

Figure 17 is manufacturing process's flow chart of corresponding the present invention the 3rd embodiment.

Figure 18 is the foundry goods that former state is kept having sand mold, the profile when cooling off rapidly.

Figure 19 loads onto after the cooling guide plate profile when cooling off rapidly to the foundry goods that former state keeps having sand mold.

Figure 20 be with the foundry goods that former state keeps having sand mold impregnated in the water, profile when making sand mold defeated and dispersed.

Figure 21 is in order to carry out Ageing Treatment, to be coated with the profile of the foundry goods of heat-insulation unit.

After Figure 22 separates metal mold, the temperature variation at each position of foundry goods.

Figure 23 is manufacturing process's flow chart of corresponding the present invention the 4th embodiment.

Figure 24 is the profile when being positioned in the foundry goods that former state keeps having sand mold on the lowering or hoisting gear.

Figure 25 impregnated in the water profile when carrying out Quenching Treatment with the foundry goods that former state keeps having sand mold.

After Figure 26 separates metal mold, the temperature at each position of foundry goods becomes variation diagram.

The specific embodiment

As preferred forms of the present invention, the cylinder cover manufacturing of making below by aluminium alloy (AC4B that JIS (JIS) regulation is for example arranged) describes the present invention in detail.But this manufacture method is also applicable to the manufacture method of the cylinder cover of magnesium alloy or other light-alloy systems.

As Fig. 1, be used to make shown in the profile of casting mold of cylinder cover, casting mold is made of a plurality of sand molds 1～5, core 6 and metal mold 7.Form the space segment corresponding 8 (that is, emitting oral area) by the sand mold in a plurality of sand molds 1～5 1,2 and 3 with rising head.In this end that emits the cylinder cover inblock cylinder column direction (length direction) of oral area 8, be formed with the down gate 9 (gate) that light-alloy liquations such as injecting molten aluminium alloy or magnesium alloy liquation is used.

Form die cavity 10 by the sand mold in a plurality of sand molds 1～5 3,4,5 and with the metal mold 7 of emitting oral area 8 to leave configuration.Configuration is by the above-mentioned core 6 of sand mold moulding in this die cavity 10.And by a plurality of runners 11 (in order to illustrate conveniently, only having represented 1 runner in the accompanying drawings) that form in the sand mold 3, the oral area 8 that emits that is positioned at upside is to be connected with the die cavity 10 that is positioned at downside.

Again, the surface of the light-alloy casting that is formed by metal mold 7 is corresponding with the combustion chamber side surface of cylinder cover.

Below, with reference to Fig. 2～Fig. 7, describe the idiographic flow that uses described casting mold (with reference to Fig. 1) to make light-alloy casting in detail.

As shown in Figure 2, light-alloy casting is by making via casting mold preparatory process S1, cast operation S2, metal mold separation circuit S3, Quenching Treatment operation S4 and ageing treatment process S5 successively.

At first in casting mold preparatory process S1,, with metal mold 7 combinations, make casting mold again with above-mentioned structure shown in Figure 1 with molding sand and the moulding of carrying out sand mold 1～5 after binding agent mixes.

Secondly, as shown in Figure 3, in cast operation S2, with light-alloy liquation 12 (that is molten aluminium alloy) from down gate 9 via emitting oral area 8 and runner 11 to be poured into the die cavity 10.And, after light-alloy liquation 12 solidifies, as shown in Figure 4, form the foundry goods that constitutes by cylinder cap 13 and rising head 14.

Then, in metal mold separation circuit S3, as shown in Figure 5, under the state that stays sand mold 1～5 and core 6 after the cast, only metal mold 7 is separated.

Again, in Quenching Treatment operation S4, as shown in Figure 6, will be injected in as the cooling water 15 of cooling medium on the surface (release surface) that the foundry goods after the SEPARATION OF GOLD genotype 7 exposed, this surface is the surface corresponding with combustion chamber side of cylinder cover.Like this, foundry goods is cooled off rapidly, and countercylinder cap 13 is bestowed Quenching Treatment.

At this moment, hardening heat is set at 480～530 ℃ (occasions of aluminium alloy system foundry goods), to be ejected into from the cooling water 15 of a plurality of nozzles 16 on the surface of the cylinder cap 13 that the foundry goods after the SEPARATION OF GOLD genotype 7 exposed, it is cooled to below 300 ℃ rapidly.

Like this, will stop to spray as water 15 sustained firings of cooling medium after the stipulated time.

Will flow down owing to be ejected into the water 15 of cylinder cap 13 from nozzle 16, therefore, ST1 is provided with the bailing bucket 17 of accepting this water 15 at cooling station (cooling station).

The sequential that stops injection water 15 is set as follows: in follow-up Ageing Treatment, the nearby part that the cast(ing) surface of cylinder cap 13 is exposed (below, sometimes abbreviate " foundry goods exposes nearly portion " as) temperature and the temperature of the nearly portion of rising head, can by from the conduction of the heat of casting pressing port 14 and backheat to aging temperature (for example, the occasion of aluminium alloy system foundry goods, this temperature are 160～240 ℃) sequential.Among Fig. 6, foundry goods exposes nearly portion and represents with B with A, the nearly portion of rising head.

Then, in ageing treatment process S5, as shown in Figure 7, on the cylinder cap 13 of foundry goods and rising head 14, be coated with under the state of described sand mold 1～5, will be attached to cast(ing) surface by the heat-barrier material 18 that the mineral wool formed body constitutes and expose on the contiguous sand mold 5.Heat-barrier material 18 uses as heat-insulation unit.The heat that utilizes rising head 14 to have keeps foundry goods integral body the stipulated time (for example 1～2 hour) down at described aging temperature (for example, the occasion of aluminium alloy system foundry goods, this temperature are 160～240 ℃), like this, implements age-hardening and handles.

As shown in Figure 7, stay in the foundry goods periphery under the state of sand mold 1～5, cylinder cap 13, rising head 14 and sand mold 1～5 are positioned on the heat-barrier material 18, thereby foundry goods is just heat insulation with the external world.Foundry goods exposes the nearly B of portion of the nearly A of portion and rising head and accepts heat from rising head 14, can be warming up to the Ageing Treatment efficient temperature.By under the soaking state, keeping the stipulated time to implement Ageing Treatment, particularly expose the nearly A of portion at foundry goods, by two kinds of processing of Quenching Treatment among the Quenching Treatment operation S3 and the Ageing Treatment among the ageing treatment process S5, the result exposes the nearly A of portion to foundry goods just to be become and has implemented the T6 processing.

Fig. 8 represents the variations in temperature at each position of aluminium alloy (AC4B) system foundry goods.As shown in the drawing, with injection (spray) time set of the cooling water 15 among the Quenching Treatment operation S4 is about 20 minutes, the temperature T a that can make foundry goods expose the nearly A of portion drops to below 100 ℃, the temperature T b of the nearly B of portion of rising head is dropped to below 150 ℃, the temperature T c of rising head 14 is dropped near 300 ℃.In ageing treatment process S5, the temperature at described each position can be remained in 160～240 ℃ the temperature range.

Below, with the mechanical property of the aluminium alloy (AC4B) made in the foregoing description system foundry goods (hot strength, 0.2% yield strength, and elongation at break), compare with each mechanical property of the aluminium alloy system foundry goods of following method manufacturing in the past.

First method in the past is, uses identical casting mold with Fig. 1, after cast, is regardless of what casting mold of leaving one's post is placed and the method that makes foundry goods.Second method in the past is, uses identical casting mold with Fig. 1, after cast, separates all casting molds, implements water-cooled and make the method for foundry goods.

Fig. 9, Figure 10 and Figure 11 have represented each comparative result of hot strength, 0.2% yield strength and elongation at break respectively, wherein, X represents the foundry goods by above-mentioned first method manufacturing in the past, Y represents that Z represents the foundry goods by above-mentioned embodiment manufacturing of the present invention by the foundry goods of above-mentioned second method manufacturing in the past.

In Fig. 9, Figure 10 and Figure 11, respectively mark the required value of each characteristic in the cylinder cover, the required value of hot strength is 206MPa, the required value of 0.2% yield strength is 190MPa and is 0.25% to the required value of elongation at break.

From Fig. 9 and Figure 10 as can be seen, by the foundry goods of the above-mentioned embodiment manufacturing of the present invention, foundry goods exposes all values of meeting the demands of the hot strength of the nearly A of portion (and the nearly B of portion of rising head) and 0.2% yield strength, and is better than each value of the foundry goods made by above-mentioned two kinds of methods in the past.

Again, as can be seen from Figure 11, by the foundry goods of the above-mentioned embodiment manufacturing of the present invention, foundry goods exposes the elongation at break of the nearly A of portion (and the nearly B of portion of rising head), though than each value difference of the foundry goods of being made by above-mentioned two kinds of methods in the past, fully satisfy the required value as cylinder cover.

Like this, the manufacture method of the light-alloy casting of the above-mentioned embodiment of the present invention (the 1st embodiment), comprise: casting mold preparatory process S1, preparation has the casting mold of sand mold 1～5 and metal mold 7, wherein, form by sand mold 1～5 that to emit oral area 8, metal mold 7 be to leave to emit oral area 8 ground to be configured, and form die cavity 10 by sand mold 1～5 and metal mold 7; Cast operation S2 pours into a mould light-alloy liquation 12 in described die cavity 10; Metal mold separation circuit S3 after the cast separates metal mold 7; Quenching Treatment operation S4 shoots out the cooling medium (that is, water 15) that cools off usefulness rapidly on the cast(ing) surface of SEPARATION OF GOLD genotype 7 after separatings and implements the Quenching Treatment of foundry goods, continues the cooling stipulated time, then, stops to shoot out cooling medium; And ageing treatment process S5 after the Quenching Treatment, covers foundry goods, utilizes heat that rising head 14 has to keep the stipulated time foundry goods is whole under aging temperature with described sand mold 1～5 and heat-insulation unit (heat-barrier material 18).

Say again, in casting mold preparatory process S1, use sand mold 1～5 and metal mold 7, prepare to have the casting mold of die cavity 10.In cast operation S2, light-alloy liquation 12 is cast in the die cavity 10.In follow-up metal mold separation circuit S3, after the cast, with under the state that leaves sand mold 1～5, only metal mold 7 is separated (release).In follow-up Quenching Treatment operation S4, cooling medium (that is, water 15) is injected on SEPARATION OF GOLD genotype 7 cast(ing) surface afterwards, foundry goods is quenched, then, the sustained firing stipulated time, stop then spraying.In follow-up ageing treatment process S5, use heat-insulation unit (heat-barrier material 18) to cover the part of the SEPARATION OF GOLD genotype 7 of foundry goods, utilize heat that rising head 14 has, under aging temperature, keep the stipulated time foundry goods is whole.

Like this, after the SEPARATION OF GOLD genotype 7, (that is, water 15) cooling is rapidly carried out Quenching Treatment to foundry goods by cooling medium.Foundry goods is covered by sand mold 1～5 and heat-barrier material 18, and this can implement age-hardening easily and handle.And the heat that Ageing Treatment can effectively utilize rising head 14 to have is implemented.So, without any need for heat-treatment furnace (aging furnace), handle suppressing to implement T6 under the situation of energy again.This can increase substantially the mechanical property of hot strength etc.

Have again, emit oral area 8 because of being provided with, thus the defective of cavity, shrinkage cavity or pore etc. can not formed in foundry goods inside, and sand mold 1～5 after the use and core 6 are in its defeated and dispersed back, certainly utilization once more.

In above-mentioned the 1st embodiment, used heat-barrier material 18 as heat-insulation unit.That is, when heat-barrier material 18 is used for heat-insulation unit, do not need to consume electric power, can help energy-conservationization.

According to present embodiment, replace heat-barrier material 18, low-temperature heater also can be used as heat-insulation unit and uses.

In above-mentioned the 1st embodiment, the hardening heat of the Quenching Treatment of carrying out for aluminium alloy system foundry goods is set at 480～530 ℃.When carrying out Ageing Treatment, foundry goods is set at 160～240 ℃ interior the maintenance 1～2 hour of temperature range.The pith (cylinder cap 13) of the foundry goods after can guaranteeing like this to make has sufficient hot strength and yield strength.

Also have, at the cylinder cover of above-mentioned aluminium alloy system foundry goods (promptly, cylinder cap 13) in, corresponding with the cast(ing) surface that metal mold 7 forms with the combustion chamber side surface of cylinder cover, the alloy liquation of the combustion chamber side surface layer part of the cylinder cover that joins with metal mold 7 solidifies quickly than the liquation of the part of sand mold 1～5, therefore the metal structure of this surface layer part is fine and closely woven, and the dimensional accuracy height.And, because the metal structure of foundry goods is fine and closely woven, handle by implementing T6, can improve its mechanical property.Thus, foundry goods has good heat-resistant anti-fatigue cracking behavior, and this is useful on the repeatedly heating and cooling of combustion chamber side surface layer part when the engine start of cylinder cover.

Describe the 2nd embodiment that uses described casting mold (with reference to Fig. 1) to make light-alloy casting in detail below with reference to Figure 12～Figure 16.

As shown in figure 12, the light-alloy casting of the present invention the 2nd embodiment is by making via casting mold preparatory process S11, cast operation S12, metal mold separation circuit S13, Quenching Treatment operation S14, slow refrigerating work procedure S15 and ageing treatment process S16 successively.

Casting mold preparatory process S11, cast operation S12 are that the method identical with above-mentioned the 1st embodiment implemented with metal mold separation circuit S13.

Next step in Quenching Treatment operation S14, as shown in figure 13, is injected in the cooling water 15 as cooling medium that cools off usefulness rapidly on the surface of SEPARATION OF GOLD genotype 7 cylinder cover 13 afterwards, and this cylinder head surface is the surface of combustion chamber side.Cool off the necessary part (surface portion of the foundry goods after the SEPARATION OF GOLD genotype 7) of foundry goods rapidly, thereby carry out the locality Quenching Treatment.

At this moment, hardening heat is set at 480～530 ℃ (occasions of aluminium alloy system foundry goods), SEPARATION OF GOLD genotype 7 will be injected in and on cylinder cap 13 surfaces of combustion chamber side that mo(U)ld face is exposed, cylinder cap 13 from the water 15 of a plurality of nozzles 16, be cooled to rapidly below 300 ℃, countercylinder cap 13 carries out Quenching Treatment.

At this, because the water 15 that is injected on the cylinder cap 13 from nozzle 16 will flow down, therefore, ST2 is provided with the bailing bucket 17 of accepting this water 15 in quench station (quenchingstation).

Next step, in slow refrigerating work procedure S15, as shown in figure 14, and will be as the vaporific water of the cooling medium of slow cooling usefulness, be that fog 19 is injected on the cast(ing) surface, this sprays and continues after the stipulated time, stops to spray.

The sequential that stops to spray this fog 19 is set as follows: in follow-up Ageing Treatment, the foundry goods that is close to cylinder cap 13 combustion chambers is exposed the temperature of the nearly A of portion and the temperature of being close to the nearly B of portion of rising head of rising head 14, by heat conduction from rising head 14, can go up to aging temperature (promptly, the occasion of aluminium alloy system foundry goods, this temperature are 160～240 ℃) sequential.

In the 2nd embodiment, the injecting time of the water 15 among the Quenching Treatment operation S14 is set at about 5 minutes, the injecting time of the fog 19 among the slow refrigerating work procedure S15 is set at about 30 minutes.The temperature T a that can make foundry goods expose the nearly A of portion drops to below 100 ℃ like this, and the temperature T b of the nearly B of portion of rising head is dropped to below 150 ℃, and the temperature T c of rising head 14 is dropped near 300 ℃.

Next step in ageing treatment process S16, as shown in figure 15, uses described sand mold 1～5 and by the heat-barrier material 18 that the mineral wool formed body is made, covers the cylinder cap 13 and the rising head 14 of foundry goods as heat-insulation unit.Then, the heat that utilizes rising head 14 to have keeps the stipulated time (that is, 1～2 hour) with foundry goods integral body at described aging temperature (that is, the occasion of aluminium alloy system foundry goods, this temperature are 160～240 ℃), implements age-hardening like this and handles.

As shown in figure 15, stay in the foundry goods periphery under the state of sand mold 1～5, cylinder cap 13, rising head 14 and sand mold 1～5 are positioned on the heat-barrier material 18, thereby foundry goods is just heat insulation with the external world, foundry goods exposes the nearly B of portion of the nearly A of portion and rising head and accepts heat from rising head 14 conduction, and temperature can be gone up to timeliness efficient temperature scope.By the Ageing Treatment that under the soaking state, keeps the stipulated time to implement, particularly expose the nearly A of portion at foundry goods, by two kinds of processing of Quenching Treatment among the Quenching Treatment operation S14 and the Ageing Treatment among the ageing treatment process S16, become and implemented the result that T6 handles.

Figure 16 represents the variations in temperature by each position of the aluminium alloy system foundry goods of the 2nd embodiment manufacturing.As shown in the drawing, with the summation time set of the injecting time of the fog 19 among the gentle slow cool down operation S15 of the injecting time of the water 15 among the Quenching Treatment operation S14 is about 35 minutes, when slowly refrigerating work procedure S15 finishes, the temperature T a that can make foundry goods expose the nearly A of portion drops to below 150 ℃, the temperature T b of the nearly B of portion of rising head is dropped to below 180 ℃, the temperature T c of rising head 14 is dropped near 300 ℃.Like this, in ageing treatment process S16, the temperature at described each position can be remained in 160～240 ℃ the temperature range.

Like this, the manufacture method of the light-alloy casting of the 2nd embodiment, comprise: casting mold preparatory process S11, preparation has the casting mold of sand mold 1～5 and metal mold 7, wherein, form by sand mold 1～5 that to emit oral area 8, metal mold 7 be to leave to emit oral area 8 ground to be configured, and form die cavity 10 by sand mold 1～5 and metal mold 7; Cast operation S12 pours into a mould light-alloy liquation 12 in described die cavity 10; Metal mold separation circuit S13 after the cast separates metal mold 7; Quenching Treatment operation S14 shoots out the cooling medium (that is, water 15) that cools off usefulness rapidly on the cast(ing) surface after SEPARATION OF GOLD genotype 7, foundry goods is quenched; Slowly refrigerating work procedure S15 after the quenching, shoots out the cooling medium (that is, fog 19) of slow cooling usefulness to described cast(ing) surface, continues the cooling stipulated time, then, stops cooling; And ageing treatment process S16 covers foundry goods by described sand mold 1～5 and heat-insulation unit (heat-barrier material 18), and the heat that utilizes rising head 14 to have keeps the stipulated time with foundry goods integral body under aging temperature.The cooling medium of using to the gentle slow cool down of the cooling medium that cools off usefulness rapidly of above-mentioned cast(ing) surface injection all is set at water.In Quenching Treatment operation S14, spray cooling water 15, slowly spraying fog 19 among the refrigerating work procedure S15.Again, change to the injection of fog 19, the temperature at each position of foundry goods can be controlled at the temperature range (with reference to the Td of Figure 16) of implementing timeliness effectively by injection from cooling water 15.

According to the above-mentioned formation of the 2nd embodiment, in casting mold preparatory process S11, use sand mold 1～5 and metal mold 7, prepare to have the casting mold of die cavity 10.In cast operation S12, light-alloy liquation 12 is cast in the die cavity 10.In follow-up metal mold separation circuit S13, after the cast, with under the state that leaves sand mold 1～5, only metal mold 7 is separated (release).In follow-up Quenching Treatment operation S14, the cooling medium (that is, water 15) that cools off usefulness rapidly is injected on SEPARATION OF GOLD genotype 7 cast(ing) surface afterwards, foundry goods is carried out Quenching Treatment.In follow-up slow refrigerating work procedure S15, the described jet surface of foundry goods is slowly cooled off the cooling medium (that is, fog 19) of usefulness, continue the cooling stipulated time, stop then spraying.In follow-up ageing treatment process S16, use heat-insulation unit (heat-barrier material 18) to cover foundry goods (for example, cylinder cap 13), the described foundry goods integral body that will center on by sand mold 1～5 and heat-barrier material 18, the heat that utilizes rising head 14 to have can keep the stipulated time under aging temperature.

Like this, after the SEPARATION OF GOLD genotype 7, (that is) cooling rapidly, water 15 is partly carried out Quenching Treatment to the cast(ing) surface after the SEPARATION OF GOLD genotype 7 by cooling medium.Have, foundry goods is covered by sand mold 1～5 and heat-insulation unit (heat-barrier material 18) again, and age-hardening easy to implement is handled.Also have, the heat that Ageing Treatment can effectively utilize rising head 14 to have is implemented.So, without any need for heat-treatment furnace (aging furnace), consumed energy and can implement T6 and handle not again.This can increase substantially the mechanical property of hot strength etc.

Also have, in slow refrigerating work procedure S15, can use fog or air (wind) as this cooling medium.But be the injection of fog 19 shown in the 2nd embodiment.In this occasion, the fog 19 that is injected on the cast(ing) surface is vaporized.Its result does not need to be provided with fixing cooling station, can slowly cooling in the conveyance of foundry goods.This is to help improving save spaceization and production efficiency.

In the 2nd embodiment,,,, omit its detailed explanation so in Figure 12～Figure 16, be marked with prosign for the part identical with preceding figure because of the occasion with aforementioned the 1st embodiment has roughly the same effect and effect about others.

Describe the 3rd embodiment that uses described casting mold (with reference to Fig. 1) to make light-alloy casting in detail below with reference to Figure 17～Figure 22.

As shown in figure 17, the light-alloy casting of the present invention the 3rd embodiment is by making via casting mold preparatory process S21, cast operation S22, metal mold separation circuit S23, Quenching Treatment operation S24, dipping operation S25 and ageing treatment process S27 successively.In addition, also can between dipping operation S25 and ageing treatment process S27, add air blowing operation S26.

Casting mold preparatory process S21, cast operation S22 are that the method identical with above-mentioned the 1st embodiment implemented with metal mold separation circuit S23.

Next step in Quenching Treatment operation S24, as shown in figure 18, will be injected on the surface of cylinder cover 13 as the water 15 of cooling medium, and this cylinder cover changes metal mold 7 after separatings to put into words, and this cylinder head surface is the surface of combustion chamber side.Therefore the local cooling of necessary part quilt of foundry goods, and quench.

At this moment, hardening heat is set at 480～530 ℃ (occasions of aluminium alloy system foundry goods), SEPARATION OF GOLD genotype 7 will be injected in and on the surface of combustion chamber side that mo(U)ld face is exposed, cylinder cap 13 from the water 15 of a plurality of nozzles 16, be cooled to rapidly below 300 ℃, countercylinder cap 13 carries out Quenching Treatment.

Again, as shown in figure 19, but between above-mentioned nozzle 16 and sand mold 1～5 and cylinder cap 13 also plug-in mounting guide plate 20, this guide plate 20 is used for 15 one sides guiding to the combustion chamber side of cylinder cap 13 of water, and anti-sealing 15 directly sprays to sand mold 5.

At this,, therefore, be provided with the bailing bucket 17 of accepting this water 15 at quench station ST2 because the water 15 that is injected on the cylinder cap 13 from nozzle 16 will flow down.

Next step is in dipping operation S25, as shown in figure 20, in case in the water 22 that sand mold 1～5, core 6 and foundry goods mass-impregnation are stored in groove 21 in advance, like this, when the cylinder cap 13 of foundry goods and rising head 14 are cooled off, make sand mold 1～5 and core 6 defeated and dispersed in water.

When carrying out this operation, for fear of water vapour outburst, treat that rising head 14 has solidified after, begin dipping, dip time is set at the several seconds.

In the 3rd embodiment, it is about 5 minutes with the time of Quenching Treatment operation S24 and the summation time set of the time of dipping operation S25.

And, rising head 14, foundry goods exposed under the nearly A of portion and the nearly B of portion of the rising head state with the temperature difference that keeping regulation flood.The part that it is the combustion chamber side of cylinder cap 13 that this foundry goods exposes the nearly A of portion, the nearly B of portion of this rising head is the part that is adjacent to rising head 14 1 sides of cylinder cap 13.

When the dipping foundry goods,, in the moulding of sand mold 1～5, preferably use water-soluble binder in order to make sand mold 1～5 and core 6 defeated and dispersed satisfactorily.In the 3rd embodiment, used magnesium sulfate hydrate as water-soluble binder.

After the dipping several seconds, take out the cylinder cap 13 and the rising head 14 of foundry goods from the water 22 of groove 21, like this, the foundry goods that the heat of rising head 14 just is transmitted to cylinder cap 13 gradually exposes nearly A of portion and the nearly B of portion of rising head.

Then, in air blowing operation S26, cylinder cap 13 that takes out among the Xiang Congshui and rising head 14 injection airs are removed the water 22 that attaches in the above.In addition, the just rising gradually of temperature by the heat foundry goods of rising head 14 exposes nearly A of portion and the nearly B of portion of rising head can make the described water that attaches 22 air dries.Therefore, under this occasion, can omit air blowing operation S26.

Next step in ageing treatment process S27, as shown in figure 21, uses as heat-insulation unit by the heat-barrier material 18,23 that the mineral wool formed body is made, to cover fully and implemented the cylinder cap 13 and the rising head 14 of blowing.Then, the heat that utilizes rising head 14 to possess keeps foundry goods integral body (that is, cylinder cap 13 and rising head 14) stipulated time under aging temperature, like this, implements age-hardening and handles.

This Ageing Treatment be with aluminium alloy system foundry goods in 160～240 ℃ temperature range, keep carrying out in 1～2 hour.This temperature (that is casting temperature) is to set by adjusting the time of taking out foundry goods from water 22.

As shown in figure 21, because heat-barrier material 18,23 is surrounding foundry goods integral body, so foundry goods is just heat insulation with the external world.Foundry goods exposes the nearly B of portion of the nearly A of portion and rising head and accepts heat from rising head 14 conduction, and temperature can be gone up to timeliness efficient temperature scope.By the Ageing Treatment that under the soaking state, keeps the stipulated time to implement, particularly expose the nearly A of portion at foundry goods, by two kinds of processing of quenching among the Quenching Treatment operation S24 and the Ageing Treatment among the ageing treatment process S27, become and implemented the result that T6 handles.

Figure 22 represents the variations in temperature by each position of the aluminium alloy system foundry goods of the 3rd embodiment manufacturing.As shown in the drawing, in Quenching Treatment operation S24, be set at about 5 minutes cool time, thereafter, foundry goods be impregnated in the water, the temperature T a that can make foundry goods expose the nearly A of portion drops to below 100 ℃, and the temperature T b of the nearly B of portion of rising head is dropped to below 150 ℃, and the temperature T c of rising head 14 is dropped near 300 ℃.Then, in ageing treatment process S27, the temperature at described each position can be remained in 160～240 ℃ the temperature range.

Like this, the manufacture method of the light-alloy casting of the 3rd embodiment, comprise: casting mold preparatory process S21, have the casting mold of sand mold 1～5 and metal mold 7, wherein, sand mold 1～5 is to use the water-soluble binder moulding, and this sand mold 1～5 forms and emits oral area 8 (with reference to Fig. 1), metal mold 7 is to leave to emit oral area 8 ground to be configured, and forms die cavity 10 by sand mold 1～5 and metal mold 7; Cast operation S22 pours into a mould light-alloy liquation 12 in described die cavity 10; Metal mold separation circuit S23 after the cast separates metal mold 7; Quenching Treatment operation S24 shoots out cooling medium (that is, water 15) on the cast(ing) surface after SEPARATION OF GOLD genotype 7, foundry goods is quenched; Dipping operation S25 is immersed in described sand mold 1～5 and foundry goods (that is, cylinder cap 13 and rising head 14) and makes the foundry goods cooling in the water 22, makes sand mold 1～5 and core 6 defeated and dispersed simultaneously; And ageing treatment process S27 behind the taking-up foundry goods, covers foundry goods by heat-insulation unit (that is, heat-barrier material 18,23) from water 22, and the heat that utilizes rising head 14 to have keeps the stipulated time with foundry goods integral body under aging temperature.

According to the above-mentioned formation of the 3rd embodiment, in casting mold preparatory process S21, just use sand mold 1～5 and the metal mold 7 that contains water-soluble binder, prepare to have the casting mold of die cavity 10.In cast operation S22, light-alloy liquation 12 is cast in the die cavity 10.In follow-up separation circuit S23, after the cast, with under the state that leaves sand mold 1～5, only metal mold 7 is separated (release).In follow-up Quenching Treatment operation S24, cooling medium (that is, water 15) is injected on SEPARATION OF GOLD genotype 7 cast(ing) surface afterwards, foundry goods is carried out Quenching Treatment.In follow-up dipping operation S25, sand mold 1～5 and foundry goods are immersed in the water 22, make the foundry goods cooling, make by sand mold after the water-soluble binder moulding 1～5 and core 6 defeated and dispersed simultaneously.In follow-up ageing treatment process S27, after foundry goods taken out from water 22, use heat-insulation unit (that is, heat-barrier material 18,23) to cover foundry goods, the heat that utilizes rising head 14 to have keeps the stipulated time foundry goods is whole under aging temperature.

Like this, after the SEPARATION OF GOLD genotype 7, (that is) cooling rapidly, water 15 is implemented Quenching Treatment to the part of the foundry goods release surface after the SEPARATION OF GOLD genotype 7 by cooling medium.Have again, foundry goods be impregnated in the water, after the taking-up, uses heat-insulation unit (that is, heat-barrier material 18,23) to cover foundry goods from water again, just can easily implement age-hardening and handle.Also have, the part of the foundry goods release surface after the SEPARATION OF GOLD genotype 7 is cooled soon more, and the metal structure of this part is just fine and closely woven more.Again, the Ageing Treatment heat that can effectively utilize rising head 14 to have is implemented.So, without any need for heat-treatment furnace (aging furnace), consumed energy and can implement T6 and handle not again.This can increase substantially the mechanical property of hot strength etc.

Also have, in dipping operation S25,, can make by the sand mold 1～5 of water-soluble binder moulding and 6 defeated and dispersed separation of core by sand mold 1～5 and foundry goods (that is, cylinder cap 13 and rising head 14) are immersed in the water.And, remove the after-heat that rising head 14 has by dipping, can shorten the cool time of foundry goods effectively from Quenching Treatment operation S24 to timeliness treatment process S27.

In the 3rd embodiment, about others, also be that the occasion with previous embodiment has roughly the same effect and effect, so in Figure 17～Figure 22, be marked with prosign, omit its detailed description for the part identical with preceding figure.

Describe the 4th embodiment that uses described casting mold (with reference to Fig. 1) to make light-alloy casting in detail below with reference to Figure 23～Figure 26.

As shown in figure 23, the light-alloy casting of the present invention the 4th embodiment is by making via casting mold preparatory process S31, cast operation S32, metal mold separation circuit S33, Quenching Treatment operation S34 and ageing treatment process S35 successively.

Casting mold preparatory process S31, cast operation S32 are that the method identical with above-mentioned the 1st embodiment implemented with metal mold separation circuit S33.

Next step, in Quenching Treatment operation S34, use lowering or hoisting gear 26 shown in Figure 24, as shown in figure 25, in the high-temperature water 25 that sand mold 1～5, core 6 and foundry goods mass-impregnation are stored in groove 24 in advance, under the not defeated and dispersed situation of sand mold 1～5 and core 6, the cylinder cap 13 and the rising head 14 of foundry goods cooled off.Particularly, SEPARATION OF GOLD the genotype 7 and surface of combustion chamber side that mo(U)ld face is exposed, the cylinder cap is is used high-temperature water 25, is cooled off rapidly, implements Quenching Treatment like this.

At this moment, hardening heat is set at 480～530 ℃ (occasions of aluminium alloy system foundry goods), make the high-temperature water 15 in the groove 24, with SEPARATION OF GOLD genotype 7 and the surface of combustion chamber side that mo(U)ld face is exposed, the cylinder cap contacts, be cooled to rapidly below 300 ℃, countercylinder cap 13 carries out Quenching Treatment.

Lowering or hoisting gear 26 shown in Figure 24 comprises: a plurality of guide rods 27 that be fixed in a sidewall of groove 24, extend along the vertical direction; The driving cylinder body 28 that constitutes by oil hydraulic cylinder etc. along 27 configurations of this guide rod; The bearing support 30 that is equipped on piston rod 29 upper ends of this driving cylinder body 28, moves up and down along the direction of described a plurality of guide rods 27; Be disposed at this bearing support 30 and supporting members 31 groove 24 corresponding sides; Level is installed on the pedestal 32 of these supporting member 31 bottoms; And, be fixed on a pair of scotch 33,33 of pedestal 32.As shown in figure 24, by manipulator clamping sand mold 1～5, core 6 and foundry goods integral body, be not positioned between a pair of scotch 33,33 on the pedestal 32 with not misplacing.Then, will move down by the piston rod 29 that drives cylinder body 28 and the pedestal 32 of guide rod 27 channeling conducts.Like this, as shown in figure 25, with sand mold 1～5, core 6 and foundry goods mass-impregnation in high-temperature water 25.

In this Quenching Treatment operation S34, cooling medium has used high-temperature water 25 (high-temperature water 25 is below 100 ℃), and, treat that rising head 14 solidifies the back, begins dipping, dip time is set in about 15 minutes.Not make high-temperature water 25 be immersed under the state of foundry goods by sand mold 1～5, flood.The temperature of high-temperature water is preferably in 90～99 ℃ of temperature ranges.By using high-temperature water, when quenching, can prevent from the cylinder cap, to produce big temperature difference, thereby can not stay high residual stress.

Sand mold 1～5 and core 6 contain non-water-soluble hardening binding agent, adopt the cold box molding method to carry out moulding.This hardening binding agent is made up of the phenolic resins of main material and the PIC of curing agent, uses amine gas (amine gas) to harden.Utilize the sand mold of this material moulding, can be not defeated and dispersed even contact with water yet.

In addition,, also can adopt the phenolic resins and the thermosetting binding agent that contains the hexamethylene-tetramine of curing agent of main material, still, preferably use above-mentioned gas hardening cohesive agent as non-water-soluble hardening binding agent.This is because at normal temperatures when using amine gas to harden, and can improve the dimensional accuracy of sand mold, also can shorten the moulding time, so preferred.

Then, from dipping process zero hour stipulated time (about 15 minutes) afterwards, make to drive cylinder body 28 start rising pedestals 32, and from groove 24, take out sand mold 1～5, core 6 and foundry goods, follow-up ageing treatment process is arrived in sand mold 1～5, core 6 and foundry goods conveyance with manipulator.Sand mold 1～5, core 6 and foundry goods are immersed in the high-temperature water 25 during, anti-basically sealing is immersed in foundry goods by sand mold 1～5 and causes cooling.Behind the dipping, the cylinder cap 13 and the rising head 14 that will have the foundry goods of sand mold 1～5 take out from the high-temperature water 25 of groove 24, and the foundry goods that the heat of rising head 14 just little by little is transmitted to cylinder cap 13 exposes nearly A of portion and the nearly B of portion of rising head.

Next step, in ageing treatment process S35, the 1st embodiment as shown in Figure 7 is identical, uses described sand mold 1～5 and heat-barrier material 18 (that is, the mineral wool formed body), covers the cylinder cap 13 and the rising head 14 that take out from water.Then, the heat that utilizes rising head 14 to have, with foundry goods integral body (that is, cylinder cap 13 and rising head 14) under aging temperature, keep the stipulated time, implement age-hardening like this and handle.

This Ageing Treatment be with aluminium alloy system foundry goods in 160～240 ℃ temperature range, keep (this temperature, time are the occasions of aluminium alloy system foundry goods) carried out in 1～2 hour.This temperature (that is casting temperature) is to take out the foundry goods time by adjustment from high-temperature water 25 to set.

Then, foundry goods integral body is surrounded, just can make foundry goods with extraneous heat insulation by using sand mold 1～5 and heat-barrier material 18.Foundry goods exposes the nearly B of portion of the nearly A of portion and rising head and accepts heat from rising head 14 conduction, and temperature can be gone up to timeliness efficient temperature scope.By the Ageing Treatment that under the soaking state, keeps the stipulated time to implement, particularly expose the nearly A of portion at foundry goods, by two kinds of processing of Quenching Treatment among the Quenching Treatment operation S34 and the Ageing Treatment among the ageing treatment process S35, become and implemented the result that T6 handles.

Figure 26 represents the variations in temperature by each position of the aluminium alloy system foundry goods of the 4th embodiment manufacturing.As shown in the drawing, in Quenching Treatment operation S34, dip time is set at about 15 minutes, and the temperature T a that can make foundry goods expose the nearly A of portion drops to about 100 ℃, the temperature T b of the nearly B of portion of rising head drops to about 150 ℃, and the temperature T c of rising head 14 is dropped near 400 ℃.And, in ageing treatment process S35 thereafter, the temperature at described each position can be converged to and remains in 160～240 ℃ the temperature range.

Like this, the manufacture method of the light-alloy casting of the 4th embodiment, comprise: casting mold preparatory process S31, have the casting mold of sand mold 1～5 and metal mold 7, wherein, sand mold 1～5 is to use water-insoluble binding agent moulding, and this sand mold 1～5 forms and emits oral area 8, metal mold 7 is to leave to emit oral area 8 ground to be configured, and forms die cavity 10 by sand mold 1～5 and metal mold 7; Cast operation S32 pours into a mould light-alloy liquation 12 in described die cavity 10; Metal mold separation circuit S33 is after the cast, with metal mold 7 separation; Quenching Treatment operation S34 impregnated in described sand mold 1～5 and foundry goods (that is, cylinder cap 13, rising head 14) in the high-temperature water 25, makes the surface cool after the SEPARATION OF GOLD genotype 7 of foundry goods; And ageing treatment process S35 takes out after sand mold 1～5 and the foundry goods from high-temperature water 25, by sand mold 1～5 and heat-insulation unit (promptly, heat-barrier material 18) cover foundry goods, the heat that utilizes rising head 14 to have keeps the stipulated time with foundry goods integral body under aging temperature.

According to the above-mentioned formation of the 4th embodiment, in casting mold preparatory process S31, use the sand mold 1～5 and the metal mold 7 that contain non-water-soluble hardening binding agent, prepare to have the casting mold of die cavity 10.In cast operation S32, light-alloy liquation 12 is cast in the die cavity 10.In follow-up metal mold separation circuit S33, under the state that leaves sand mold 1～5, only metal mold 7 is separated (release).In follow-up Quenching Treatment operation S34, in high-temperature water 25, sand mold 1～5 and foundry goods integral body are cooled off, cast(ing) surface after the SEPARATION OF GOLD genotype 7 is cooled off rapidly and carry out Quenching Treatment.In follow-up ageing treatment process S35, from high-temperature water 25, take out after sand mold 1～5 and the foundry goods, use heat-insulation unit (promptly, heat-barrier material 18) covers the part of being exposed after the SEPARATION OF GOLD genotype 7 of foundry goods, the heat that utilizes rising head 14 to have keeps the stipulated time with foundry goods integral body under aging temperature.

Like this, after the SEPARATION OF GOLD genotype 7,, the part of the foundry goods release surface after the SEPARATION OF GOLD genotype 7 is implemented Quenching Treatment by foundry goods being impregnated in the high-temperature water 25.Have again, after foundry goods is taken out from water, use sand mold 1～5 and heat-insulation unit (that is, heat-barrier material 18) to cover foundry goods, just can easily realize the age-hardening processing.Also have, the part of the foundry goods release surface after the SEPARATION OF GOLD genotype 7 is cooled soon more, and the metal structure of this part is just fine and closely woven more.Again, the Ageing Treatment heat that can effectively utilize rising head 14 to have is implemented.So, without any need for heat-treatment furnace (aging furnace), consumed energy and can implement T6 and handle not again.This can increase substantially the mechanical property of hot strength etc.

Also have, in Quenching Treatment operation S34,, can remove the after-heat that rising head 14 has, so can shorten the cool time to the foundry goods of ageing treatment process S35 effectively from Quenching Treatment operation S34 by sand mold 1～5 and foundry goods are immersed in the high-temperature water 25.

In the 4th embodiment, about others, also be that the occasion with previous embodiment has roughly the same effect and effect, so in Figure 23～Figure 26, be marked with prosign, omit its detailed description for the part identical with preceding figure.

In the above-described embodiments, used the AC4B aluminium alloy of stipulating by JIS (JIS) as light-alloy.But,, also can use other aluminium alloy, magnesium alloy (such as JIS MC1 is arranged) etc. to replace this aluminium alloy.

In the occasion that light-alloy casting is made by magnesium alloy, the casting temperature that Quenching Treatment is preceding or dipping is preceding is preferably in 380～390 ℃ scope.When Ageing Treatment, preferably foundry goods was kept 1～2 hour in 220～260 ℃ of temperature ranges.

Example as making cast product has all adopted cylinder cover at the foregoing description.But the present invention is not limited to this goods.Method of the present invention goes for the manufacturing of various light-alloy castings, so long as handle by implementing Quenching Treatment shown in the foregoing description and age-hardening, just can improve the mechanical property of foundry goods pith.Thereby can improve the serviceability of foundry goods.

In addition, be illustrated with regard to member of the present invention and the foregoing description corresponding components, material etc.Cooling medium is and cooling water 15 that the cooling medium that cools off usefulness rapidly is and water 15 that the cooling medium that slowly cools off usefulness is and fog 19 that heat-insulation unit is and heat-barrier material 18,23 that each is corresponding for water-soluble binder and magnesium sulfate hydrate.Certainly, member of the present invention not only is defined in above-mentioned parts, material etc.

According to the present invention, form die cavity by sand mold with rising head counterpart and metal mold.After the cast, only metal mold is separated, then, Quenching Treatment (comprising solution treatment) is carried out in the local cooling of cast(ing) surface after using cooling medium with the SEPARATION OF GOLD genotype.By the heat that effectively utilize described rising head have carry out Ageing Treatment thereafter.Thus, without any need for heat-treatment furnace (that is, aging furnace), can implement the T6 processing, thereby can fully improve the mechanical property of hot strength, 0.2% yield strength etc.

As mentioned above, light-alloy casting of the present invention is made by following steps.Promptly, preparation has the casting mold of sand mold and metal mold, and wherein, described sand mold has the part corresponding with rising head, described metal mold is to leave described corresponding with the rising head described casting mold that partly is configured in, and is formed the die cavity of described casting mold by described sand mold and metal mold; Cast light-alloy liquation in the die cavity of described casting mold; Separate described metal mold from light-alloy casting; Cooling medium is contacted with the surface (release surface) of described SEPARATION OF GOLD genotype foundry goods afterwards, thereby Quenching Treatment is bestowed on described surface; And the heat that utilizes described rising head to have is bestowed the Ageing Treatment of stipulated time to described foundry goods.

Particularly, the manufacture method of light-alloy casting of the present invention is characterised in that, comprise: the casting mold preparatory process, preparation has the casting mold of sand mold and metal mold, described sand mold has the part corresponding with rising head, described metal mold is to leave described partly be configured in described casting mold on corresponding with rising head, and is formed the die cavity of described casting mold by described sand mold and metal mold; The cast operation, cast light-alloy liquation in the die cavity of described casting mold; The metal mold separation circuit separates described metal mold from light-alloy casting; Quenching Treatment operation, the surface (release surface) that makes the foundry goods after cooling medium and the described SEPARATION OF GOLD genotype contact and cool off described foundry goods rapidly; And ageing treatment process uses heat-insulation unit to cover described release surface, and the heat that utilizes described rising head to have keeps the stipulated time to the described foundry goods integral body that is centered on by described sand mold and described heat-insulation unit under aging temp.

The feature of the manufacture method of light-alloy casting of the present invention also is, comprise: the casting mold preparatory process, preparation has the casting mold of sand mold and metal mold, described sand mold has the part corresponding with rising head, described metal mold is to leave described partly be configured in described casting mold on corresponding with rising head, and is formed the die cavity of described casting mold by described sand mold and metal mold; The cast operation, cast light-alloy liquation in described die cavity; The metal mold separation circuit separates described metal mold from light-alloy casting; Quenching Treatment operation, the surface (release surface) that cooling medium is shootd out the foundry goods after described SEPARATION OF GOLD genotype go up and cool off described foundry goods rapidly, after continuing that described cooling medium shootd out the stipulated time, stop to shoot out described cooling medium; And ageing treatment process uses heat-insulation unit to cover described release surface, and the heat that utilizes described rising head to have keeps the stipulated time to the described foundry goods integral body that is centered on by described sand mold and described heat-insulation unit under aging temp.

The feature of the manufacture method of light-alloy casting of the present invention is in addition, comprise: the casting mold preparatory process, preparation has the casting mold of sand mold and metal mold, described sand mold has the part corresponding with rising head, described metal mold is to leave described partly be configured in described casting mold on corresponding with rising head, and is formed the die cavity of described casting mold by described sand mold and metal mold; The cast operation, cast light-alloy liquation in described die cavity; The metal mold separation circuit separates described metal mold from light-alloy casting; Quenching Treatment operation, the surface (release surface) that makes the foundry goods after the cooling medium that cools off usefulness rapidly and the described SEPARATION OF GOLD genotype contact and cool off described foundry goods rapidly; Slowly refrigerating work procedure after cooling off rapidly, shoots out the cooling medium that slowly cools off usefulness on described cast(ing) surface, and described foundry goods is continued the cooling stipulated time, then, stops to shoot out the cooling medium of described slow cooling usefulness; And ageing treatment process uses heat-insulation unit to cover described release surface, and the heat that utilizes described rising head to have keeps the stipulated time to the described foundry goods integral body that is centered on by described sand mold and described heat-insulation unit under aging temp.

The feature of the manufacture method of light-alloy casting of the present invention is again, comprise: the casting mold preparatory process, preparation has the casting mold of sand mold and metal mold, described sand mold contains water-soluble binder and has the part corresponding with rising head, described metal mold is to leave described partly be configured in described casting mold on corresponding with rising head, and is formed the die cavity of described casting mold by described sand mold and metal mold; The cast operation, cast light-alloy liquation in the die cavity of described casting mold; The metal mold separation circuit separates described metal mold from light-alloy casting; Quenching Treatment operation, the surface that makes the foundry goods after cooling medium and the described SEPARATION OF GOLD genotype contact and cool off described foundry goods rapidly; The dipping operation is immersed in the described foundry goods that is stained with described sand mold in the water, makes described foundry goods cooling and makes described sand mold defeated and dispersed; And ageing treatment process behind the described foundry goods of taking-up, uses heat-insulation unit to cover described foundry goods from described water, and the heat that utilizes described rising head to have keeps the stipulated time to the described foundry goods integral body that is centered on by described heat-insulation unit under aging temp.

The feature of the manufacture method of light-alloy casting of the present invention also is in addition, comprise: the casting mold preparatory process, preparation has the casting mold of sand mold and metal mold, described sand mold contains non-water-soluble hardening binding agent and has the part corresponding with rising head, described metal mold is to leave described partly be configured in described casting mold on corresponding with rising head, and is formed the die cavity of described casting mold by described sand mold and metal mold; The cast operation, cast light-alloy liquation in described die cavity; The metal mold separation circuit separates described metal mold from light-alloy casting; The Quenching Treatment operation is immersed in the described foundry goods that is stained with described sand mold in the water, and described cast(ing) surface is cooled off rapidly; And, ageing treatment process, after from described water, taking out described foundry goods, use heat-insulation unit to cover the surface of described SEPARATION OF GOLD genotype foundry goods afterwards, the heat that utilizes described rising head to have keeps the stipulated time to the described foundry goods integral body that is centered on by described sand mold and described heat-insulation unit under aging temp.

According to the present invention, after the cast, only metal mold is separated, use the local quenching of cast(ing) surface after cooling medium makes the metal mold separation, so that carry out Quenching Treatment (comprising solution treatment), then, the heat that effectively utilizes rising head to have carries out age-hardening to be handled.Thus, can implement T6 without any need for heat-treatment furnace (aging furnace) and handle, can obtain the good light-alloy casting of mechanical property of hot strength etc.

Have again, in the operation of implementing slowly cooling, can use fog or cooling air as the cooling medium of slow cooling usefulness.When spraying fog on cast(ing) surface, fog is just gasified.Thus, do not need the cooling station fixed, can slowly cooling in the conveyance of foundry goods, can realize save spaceization, and can enhance productivity.

The manufacture method of light-alloy casting of the present invention is specially adapted to the manufacturing of the cylinder cover of aluminium alloy system or magnesium alloy system.When adopting method of the present invention to carry out the cylinder cover manufacturing, it is corresponding with the combustor surface of cylinder cover will contacting the cast(ing) surface that forms with metal mold.

When adopting method of the present invention to carry out the cylinder cover manufacturing, the combustor surface of cylinder cover is to contact with metal mold, and molten metal just solidifies quickly than the part of sand mold, not only makes metal structure fine and closely woven, and makes the dimensional accuracy of foundry goods higher.Add,, handle that can improve its mechanical property, therefore, the heat-resistant anti-fatigue cracking behavior might as well by implementing T6 because metal structure is fine and closely woven.This is the heating and cooling repeatedly that help in the combustion chamber of the cylinder cover of engine operation.

Adopt under the occasion of making by aluminium alloy at cylinder cover, preferably use the represented aluminium alloy of JIS (JIS H5202) AC4B.This aluminium alloy AC4B be contain that Cu:2.0～4.0%, Si:7.0～10.0%, Mg:0.6% are following, Zn:1.0% is following, Fe:1.2% is following, Mn:0.8% is following, Ni:0.5% is following, Ti:0.2% is following, all the other are the alloy of Al.

Adopt under the occasion of making by magnesium alloy at cylinder cover, preferably use the represented magnesium alloy of JIS (JIS H5203) MC1.This magnesium alloy be contain that Al:5.3～6.7%, Zn:2.5～3.5%, Mn:0.15～0.6%, Si:0.30% are following, Cu:0.10% is following, Ni:0.01% is following, all the other are the alloy of Mg, are equivalent to the alloy of the Mg alloy castings trade mark 1 class.

Aging temperature decides according to the alloy species and the chemical composition of light alloy casting, sets by (occasion of implementing slowly cooling thereafter be slowly cooling after) after the selected Quenching Treatment, the time or injection cooling medium to the time that stops that contact with cooling medium.Perhaps set from dipping to the time of from water, taking out foundry goods by selected.This time is subjected to the kind, shape, size of foundry goods or the influence of structure, also is subjected to the influence of kind, contact area or jetting amount etc. of size (that is its heat that has), the cooling medium of rising head.Again, to be configured to make the mechanical property of hot strength etc. with this aging temperature be the state of the best the retention time during Ageing Treatment.

Under the occasion that light-alloy casting is made by aluminium alloy, the hardening heat of the foundry goods during Quenching Treatment is preferably 480～530 ℃ scope.When carrying out Ageing Treatment, preferably foundry goods was kept in 160～240 ℃ temperature range 1～2 hour.If hardening heat is lower than 480 ℃, then solution treatment is insufficient, if surpass 530 ℃, causes that then foundry goods is softening, is difficult to keep the foundry goods shape.Again, the temperature of Ageing Treatment is if be lower than 160 ℃, and then Ageing Treatment needs for a long time, if surpass 240 ℃, the effect that then obsolesces descends intensity.Have, the Ageing Treatment time needs 1 hour at least in above-mentioned temperature range again, if foundry goods was kept 2 hours, just can obtain sufficient Ageing Treatment effect (that is, effect almost reach capacity state).

(occasion of implementing slowly cooling thereafter be slowly cooling after) after the Quenching Treatment, with the time that contacts or injection cooling medium to the time that stops of cooling medium be, by following condition enactment.That is, in follow-up Ageing Treatment,, the temperature of foundry goods integral body (remove feeder) can be reached within the scope that is in above-mentioned aging temperature by the backheat that the heat that utilizes rising head to have causes.For dipping to the time of taking out foundry goods from water also is that the backheat that the heat that utilizes rising head to have causes can be in the scope of above-mentioned aging temperature the temperature of foundry goods integral body (remove feeder) equally certainly.

The binding agent that uses in the moulding as sand mold and core can use water-soluble binder, also can use the agent of gas hardening cohesive or the thermosetting binding agent of water-insoluble binding agent.

Say again, defeated and dispersed in order to make sand mold in the dipping operation, need to use water-soluble binder that sand mold is carried out moulding.As this water-soluble binder, can adopt at least a inorganic sulfur acid compound that is selected from magnesium sulfate hydrate, aluminum sulfate hydrate, sodium sulphate hydrate, nickelous sulfate hydrate and the manganese sulfate hydrate.Consider that from the viewpoint of guaranteeing stable mould strength preferred use mainly contains the binding agent of magnesium sulfate hydrate.

When the dipping foundry goods carries out Quenching Treatment, defeated and dispersed in order not make sand mold, need to use non-water-soluble hardening binding agent that sand mold is carried out moulding.As this water-insoluble binding agent, preferably by the gas hardening cohesive agent of amine air hardeningization, this binding agent is made up of the phenolic resins of main material and the PIC of curing agent.

As heat-insulation unit, can use heat-barrier material or low-temperature heater.As heat-barrier material, can use mineral wool formed body or plasterboard etc.

As mentioned above, just the present invention has been described in detail with the relevant accompanying drawing of reference by embodiment, but the present invention is not limited to the foregoing description, and change is implemented in the scope of content on do not break away from, and all is included in the technical scope of the present invention.In addition, in specification " more than " and " following " all comprise given figure, for example, " more than the X " refers to " equal X or greater than X ", " X following " refers to " equal X or less than X ", " surpassing ", " exceeding ", " less than " and " deficiency " neither given figure that comprises.Also have, described in the above rising head comprises and half curdled appearance promptly, still contains the rising head of liquid part in rising head inside.Therefore, the heat that has of rising head comprises from liquid state and is transformed into the latent heat that takes place when solid-state.

Claims (16)

1. the manufacture method of a light-alloy casting is characterized in that, may further comprise the steps:

Preparation has the casting mold of sand mold and metal mold, and wherein, described sand mold has the part corresponding with rising head, and described metal mold is to leave described corresponding with the rising head described casting mold that partly is configured in, and is formed the die cavity of described casting mold by described sand mold and metal mold;

Cast light-alloy liquation in the die cavity of described casting mold;

Separate described metal mold from light-alloy casting;

Cooling medium is contacted with the surface of described SEPARATION OF GOLD genotype foundry goods afterwards, thereby Quenching Treatment is bestowed on described surface;

And

The heat that utilizes described rising head to have is bestowed the Ageing Treatment of stipulated time to described foundry goods.

2. the manufacture method of light-alloy casting as claimed in claim 1, wherein,

In the step of described Ageing Treatment, the use heat-insulation unit covers the surface of the foundry goods after the described SEPARATION OF GOLD genotype, thereby the heat that utilizes described rising head to have comes described foundry goods is bestowed Ageing Treatment.

3. the manufacture method of light-alloy casting as claimed in claim 2, wherein,

Described cooling medium is shootd out on the surface of the foundry goods after described SEPARATION OF GOLD genotype.

4. the manufacture method of light-alloy casting as claimed in claim 3, wherein,

Described cooling medium is the cooling medium that cools off usefulness rapidly, and is further comprising the steps of:

After the described step of shooing out the cooling medium that cools off usefulness rapidly, the another kind of cooling medium that slowly cools off usefulness is shootd out on the surface of the foundry goods after described SEPARATION OF GOLD genotype.

5. the manufacture method of light-alloy casting as claimed in claim 4, wherein,

The described cooling medium that cools off usefulness rapidly is a water, and the cooling medium of described slow cooling usefulness is fog or air.

6. the manufacture method of light-alloy casting as claimed in claim 3, wherein,

Described sand mold contains water-soluble binder, and is further comprising the steps of:

After the surface of the foundry goods after described SEPARATION OF GOLD genotype shoots out the step of described cooling medium, the described foundry goods that is stained with described sand mold is immersed in the water, makes the foundry goods cooling and make described sand mold defeated and dispersed.

7. the manufacture method of light-alloy casting as claimed in claim 6, wherein,

In the step of described Ageing Treatment, behind the described foundry goods of taking-up, using thermal insulation material covers described foundry goods integral body from water, thereby the heat that utilizes described rising head to have comes described foundry goods is bestowed Ageing Treatment.

8. the manufacture method of light-alloy casting as claimed in claim 1, wherein:

Described sand mold contains water-insoluble binding agent;

Described the step of Quenching Treatment is bestowed on described surface, the described foundry goods that is stained with described sand mold is immersed in the water, make the surface of the foundry goods after the described SEPARATION OF GOLD genotype be contacted with water, thereby quenched in this surface;

In the step of described Ageing Treatment, the use heat-insulation unit covers the surface of the foundry goods after the described SEPARATION OF GOLD genotype, thereby the heat that utilizes described rising head to have comes described foundry goods is bestowed Ageing Treatment.

9. the manufacture method of light-alloy casting as claimed in claim 8, wherein,

Described water-insoluble binding agent contains the agent of gas hardening cohesive, and this gas hardening cohesive agent is made up of the phenolic resins of main material and the PIC of curing agent.

10. the manufacture method of light-alloy casting as claimed in claim 9, wherein,

Described sand mold is by the amine air hardeningization.

11. the manufacture method of light-alloy casting as claimed in claim 2, wherein,

Described heat-insulation unit is a heat insulating member.

12. the manufacture method of light-alloy casting as claimed in claim 1, wherein,

Described light-alloy casting is made by aluminium alloy.

13. the manufacture method of light-alloy casting as claimed in claim 12, wherein,

The hardening heat of described Quenching Treatment is 480～530 ℃.

14. the manufacture method of light-alloy casting as claimed in claim 12, wherein,

In the step of described Ageing Treatment, described foundry goods was kept under 160～240 ℃ temperature 1～2 hour.

15. the manufacture method of light-alloy casting as claimed in claim 1, wherein,

Described light-alloy casting is the cylinder cover of engine, and the surface that contacts the described foundry goods that forms with metal mold is corresponding with the combustor surface of engine.

16. the manufacture method of light-alloy casting as claimed in claim 1, wherein,

Described cooling medium is a water.

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