CN101631631A - Hollow member, cylinder sleeve and methods for producing them - Google Patents

Abstract

The tubular die (22) of a centrifugal casting device (20) of GNo.30 or above is employed suitably and powder (P) is introduced while rotating, and an outer tubular body (14) composed of that powder (P) is provided. Subsequently, molten (L1) is introduced to the inner circumferential wall side of the outer tubular body (14) while sustaining rotation of the tubular die (22) thus forming an inner tubular body (12). The outer tubular body (14) functions as a cooling metal (chiller) when the molten (L1) is cooled and solidified. In place of the outer tubular body (14) composed of the powder (P), molten may be used for forming an outer tubular body or an outer tubular molding molded previously into tubular shape may be employed.

Description

Hollow part, cylinder jacket and manufacture method thereof

Technical field

The present invention relates to hollow part, cylinder jacket and the manufacture method thereof of basic tubular.

Background technology

Cylinder jacket can be arranged in the cylinder-bore of the internal combustion engine that is used for driving automobile.Piston moves back and forth in cylinder-bore, and the side perisporium of piston contacts slidably with the internal perisporium of cylinder jacket.In recent years, aluminium alloy, particularly Al-Si alloy be day by day as the material of cylinder jacket, this be because alloy in light weight, wearability is high and intensity is high.

Can make cylinder jacket by the so-called centre spinning described in patent documentation 1.In this case, melt is introduced in the cylindrical die of rotation, melt is distributed in because of centrifugal force on the internal perisporium of cylindrical die, to form cylindrical body.The melt of tubular solidifies by cooling, and the prefabricated component that is obtained obtains the tubular products of cylinder jacket through processing (for example planing).The concaveconvex shape of the coating surface on the cylindrical die inwall is transferred to the periphery wall of cylinder jacket, forms so-called thorn (spiny) thus on cylinder jacket.

Can form cylinder block by cylinder jacket being placed on precalculated position in the mould, in mould, adding melt, cool off and solidify described melt (that is, by casting).Cast described casting cylinder block around described cylinder jacket.By the anchoring piece on the cylinder jacket periphery wall (for example described thorn, by irregular body that is processed to form (for example line of rabbet joint) of planing and so on or the concaveconvex shape that forms by bead), strengthen the bond strength between cylinder block and the cylinder jacket.

Make under the situation of cylinder jacket by the centre spinning described in patent documentation 1 at the melt that utilizes the Al-Si alloy, primary crystal Si particle anisotropically distributes, and the amounts of particles specific diameter around the periphery wall in the prefabricated component is bigger around mid portion.Therefore, when the internal perisporium of planing prefabricated component, the primary crystal Si content of the internal perisporium that can contact slidably with piston of the cylinder jacket of formation is low.In other words, under the situation of the cylinder jacket by centrifugal casting manufactured Al-Si alloy, easily the Si ratio of components of control cylinder cover is difficult to obtain desired performance thus.

Considered the intensity that increases cylinder jacket when keeping enough toughness, research improves metal structure, is specially the size of the primary crystal Si particle that produces when reducing to solidify the Al-Si alloy melt.Yet, in order to realize reducing the size of primary crystal Si particle, must make casting condition the best, for example make cylindrical die rotating speed and temperature the best in the centre spinning.Therefore, need test and wrong the processing to make casting condition the best.In addition, in large-scale production, must the optimized casting condition of strict control.

Aluminium and alloy thereof day by day have been used as the material of cylinder block, and cylinder block is cast around cylinder jacket.Yet the melt that is used to form cylinder block has mobile good component, and casting processing smoothly, yet the melt that is used to form cylinder jacket has wear-resisting good component.Therefore, it is always not corresponding with the component of the melt that is used to form cylinder jacket to be used to form the component of melt of cylinder block.In the component of melt not simultaneously, the linear expansion coefficient of cylinder block and cylinder jacket is also different.

When the linear expansion coefficient difference was very big, although in the cooling of melt with produce the anchorage effect of thorn in solidifying, the bond strength between cylinder block and the cylinder jacket was not enough usually.In the method that patent documentation 2 is proposed, improve bond strength by on the periphery wall of cylinder jacket, forming the projection bigger than thorn.In addition, described in patent documentation 3, improve bond strength by the periphery wall that applies cylinder jacket with acolite.

Yet all unexposed being used for is evenly dispersed in the method that the cylinder jacket neutralization is used to reduce primary crystal Si particle size substantially with primary crystal Si particle in patent documentation 2 and the patent documentation 3.In addition, need improve bond strength between cylinder jacket and the cylinder block than the simpler method of disclosed method in the described patent documentation.

Patent documentation 1: Japan Patent 52-027608 communique

Patent documentation 2: No. 3866636 communique of Japan Patent

Patent documentation 3: Japanese laid-open patent 2006-043708 communique

Summary of the invention

Roughly purpose of the present invention provides a kind of hollow part with controlled ratio of components of each composition.

Main purpose of the present invention provides a kind of hollow part that comprises the primary crystal Si particle that size reduces.

Another object of the present invention provides a kind of cylinder jacket that can be connected easily with cylinder block.

A further object of the present invention provides a kind of cylinder jacket with internal perisporium of high abrasion resistance.

Another purpose of the present invention provides a kind of method that is used to make hollow part, and this method can be carried out simply and need not strict control casting condition.

A further object of the present invention provides a kind of method that is used to make cylinder jacket, and in this cylinder jacket, thin primary crystal Si particle disperses substantially equably.

According to an aspect of the present invention, the hollow part of a kind of basic tubular, stacked type is provided, this hollow part comprises the inner cylindrical body that the outer cylindrical body is connected with internal perisporium with this outer cylindrical body, wherein, described outer cylindrical body forms by the powder of fusing aluminum or aluminum alloy, and described inner cylindrical body is by the Al-Si alloy composition.

In aspect this, as described below, form described inner cylindrical body by the centrifugal casting melt.In described centrifugal casting, described outer cylindrical body and function is made cool metal spare (cooler), to improve the cooldown rate of described melt.Therefore, thin primary crystal Si particle radially distributing substantially equably along described inner cylindrical body.In other words, be dispersed in the described inner cylindrical body of described hollow part to thin primary crystal Si uniform particles.Therefore, described inner cylindrical body performance substantially constant in different parts.

Described hollow part can pass through planing described internal perisporium (inner cylindrical body) and attenuation, to make cylinder jacket.Because primary crystal Si particle disperses substantially equably, even therefore under these circumstances, the product of formation also can present enough wearabilities etc.

The preferred embodiment that is used to form the aluminium alloy of described outer cylindrical body comprises the Al-Si alloy.The component that is used to form the described Al-Si alloy of described outer cylindrical body can be identical or different with the component of the Al-Si alloy that is used to form described inner cylindrical body.For example, described outer cylindrical body comprises Al-12%Si alloy (in mass, following component ratio also by percentage to the quality), and described inner cylindrical body comprises the Al-23%Si alloy.

According to a further aspect of the invention, a kind of method is provided, this method by centrifugal casting by making the hollow part of basic tubular, stacked type in the cylindrical die that melt is fed to rotation, this method comprises the following steps: the powder of aluminum or aluminum alloy is introduced in the cylindrical die of described rotation, to form the outer cylindrical body; And the described melt of Al-Si alloy is guided on the internal perisporium of described outer cylindrical body, therefore make described powder smelting, and form the inner cylindrical body of described melt, comprise stacked hollow part of described outer cylindrical body and the described inner cylindrical body that is connected with its described internal perisporium with manufacturing.

In aspect this, at first utilize powder to form described outer cylindrical body, by centrifugal casting described inner cylindrical body is formed in the described outer cylinder body then.Described outer cylindrical body and function improves the cooldown rate of described melt as cooler.Therefore, described melt solidified before primary crystal Si particle becomes big or close described outer cylindrical body motion.As a result, described inner cylindrical body has the wherein thin homodisperse substantially structure of primary crystal Si particle.

In addition, in aspect this, melt does not need to be used to melt the process and the smelting furnace of described powder thus not as the material that forms described outer cylindrical body.Therefore, can prevent to be used to melt the increase of the cost and the equipment of described powder, therefore can make described hollow part with the cost that reduces.

When the powder that will be used to form described outer cylindrical body was introduced in the described cylindrical die, described cylindrical die was preferably with ((G No.) the above rotation of the G number more than 30.In this case, described powder is forced into because of centrifugal force on the internal perisporium of described cylindrical die and does not fall, thereby can form described outer cylindrical body reliably.

As mentioned above, the preferred embodiment that is used to form the aluminium alloy of described outer cylindrical body comprises the Al-Si alloy.

According to a further aspect in the invention, the hollow part of a kind of basic tubular, stacked type is provided, this hollow part comprises outer cylindrical body and inner cylindrical body, described outer cylindrical body and described inner cylindrical body from the outside by outer cylindrical body and such being disposed in order of inner cylindrical body, wherein, described inner cylindrical body and described outer cylindrical body are by the Al-Si alloy composition of same type.

In the present invention, term " alloy of same type " is meant the alloy that is categorized in the identical casting alloy group in the standard of for example Japanese Industrial Standards (JIS).For example, in aspect this, when described inner cylindrical body comprised the equivalent material (according to the aluminium alloy of JIS) of AC9A, described outer cylinder body also comprised the equivalent material of AC9A.In this case, the component of described equivalent material needn't be strict identical.The equivalent material of AC9A is that to comprise be the aluminium alloy of 22% to 24% Si in mass.For example, comprise be in mass 22% Si AC9A equivalent material and to comprise be that the equivalent material of AC9A of 24% Si can be respectively applied for described inner cylindrical body and described outer cylindrical body in mass.

In aspect this, as described below, form described outer cylindrical body by centrifugal casting, by centrifugal casting described inner cylindrical body is formed in the described outer cylindrical body.In described centrifugal casting, described outer cylindrical body is as cool metal spare (cooler), to improve the cooldown rate of melt.Therefore, thin primary crystal Si particle radially distributing substantially equably along described inner cylindrical body.In other words, be dispersed in to described thin primary crystal Si uniform particles in the inner cylindrical body of described hollow part.Therefore, described inner barrel performance substantially constant in different parts.

Described hollow part can the attenuation by planing described internal perisporium (on the inner cylindrical body side surface).Because primary crystal Si particle disperses substantially equably, even therefore under these circumstances, the product of formation also can present enough wearabilities etc.

The average diameter of the primary crystal Si particle in the metal structure of described inner cylindrical body is preferably below the 35 μ m.In this case, the hollow part of formation is high abrasion resistance not only, and intensity is also good.

According to another aspect of the invention, a kind of method is provided, this method by centrifugal casting by making the hollow part of basic tubular, stacked type in the cylindrical die that melt is fed to rotation, this method comprises the following steps: the melt of Al-Si alloy is introduced in the cylindrical die of rotation, therefore forms the outer cylindrical body by centrifugal casting; And the melt of the Al-Si alloy of same type is guided in the described outer cylindrical body, rotated described cylindrical die simultaneously, thereby form the inner cylindrical body, to prepare stacked prefabricated component by centrifugal casting.

In aspect this, described outer cylindrical body is used to form the cooldown rate of the melt of described inner cylindrical body as cooler with raising.Therefore, described melt solidified before primary crystal Si particle becomes big or close described outer cylindrical body motion.As a result, described inner cylindrical body has the wherein thin homodisperse substantially structure of primary crystal Si particle.

In addition, described hollow part can be only adds in the described cylindrical die twice simple procedure to by the melt with same type to be made, thereby can prevent to increase production cost.Therefore, can make described hollow part with the cost that reduces.

In aspect this, the thickness of described outer cylindrical body is preferably 0.5mm to 2.0mm, and after the temperature of described outer cylindrical body is reduced to below the liquid-solid phase line temperature of phase diagram, introduces the described melt that is used to form described inner cylindrical body.In this case, the average diameter of primary crystal Si particle can be decreased to below the 35 μ m

According to another aspect of the invention, the hollow part of a kind of basic tubular, stacked type is provided, this hollow part comprises the inner cylindrical body of casting and outer cylindrical organizator, the described inner cylindrical body of casting and described outer cylindrical organizator from the inboard by the described inner cylindrical body of casting and such being disposed in order of described outer cylindrical organizator, wherein, the described inner cylindrical body of casting comprises aluminum or aluminum alloy, and described outer cylindrical organizator is by the Al-Si alloy composition.

In aspect this, as described below, described outer cylindrical organizator inserts in the cylindrical die of centrifugal casting machine in advance, and by centrifugal casting the described inner cylindrical body of casting is formed in the described outer cylindrical organizator.In described centrifugal casting, described outer cylindrical organizator is as cool metal spare (cooler), to improve the cooldown rate of melt.Therefore, thin primary crystal Si particle radially distributing substantially equably along the described inner cylindrical body of casting.In other words, be dispersed in to described thin primary crystal Si uniform particles in the inner cylindrical body of casting of described hollow part.Therefore, described inner cylindrical body of casting performance substantially constant in different parts.

Described hollow part can the attenuation by planing described internal perisporium (on the side of the inner cylindrical body of casting).Because primary crystal Si particle disperses substantially equably, even therefore under these circumstances, the product of formation also can present enough wearabilities etc.

The average diameter of the primary crystal Si particle in the metal structure of the described inner cylindrical body of casting is preferably below the 35 μ m.In this case, the hollow part of formation is high abrasion resistance not only, and intensity is also good.

According to another aspect of the invention, a kind of method that is used to make hollow part is provided, this hollow part comprises the inner cylindrical body of casting and outer cylindrical organizator, by the described inner cylindrical body of casting and such being disposed in order of described outer cylindrical organizator, this method comprises the following steps: that the cylindrical shell that will be used to form the aluminum or aluminum alloy of described outer cylindrical organizator inserts in the cylindrical die of centrifugal casting machine from the inboard for the described inner cylindrical body of casting and described outer cylindrical organizator; And the melt of Al-Si alloy is introduced in the described cylindrical die, rotated described cylindrical die simultaneously, therefore form the described inner cylindrical body of casting, to prepare stacked prefabricated component by centrifugal casting.

In aspect this, described outer cylindrical body forms as cooler, is used to form the cooldown rate of the melt of the described inner cylindrical body of casting with raising.Therefore, described melt solidified before primary crystal Si particle becomes big or close described outer cylindrical organizator motion.As a result, the described inner cylindrical body of casting has the wherein thin homodisperse substantially structure of primary crystal Si particle.

In addition, described hollow part can be only by described organizator (outer cylindrical organizator) being inserted in the described cylindrical die and the simple procedure that the melt of Al-Si alloy adds in the described cylindrical die is made, thereby can prevent to increase production cost.Therefore, can make described hollow part with the cost that reduces.

In aspect this, the thickness of described outer cylindrical organizator is preferably 1.0mm to 2.0mm.In this case, the average diameter of primary crystal Si particle can be decreased to below the 35 μ m, and can further reduce its particle size distribution width.

In aspect above-mentioned, the preferred embodiment of hollow part comprises the cylinder jacket in the hole of the cylinder block of waiting to be arranged in internal combustion engine.Can make described cylinder jacket by the internal perisporium of the described prefabricated component of planing.

According to another aspect of the invention, cylinder jacket in a kind of hole of the cylinder block of waiting to be arranged in internal combustion engine is provided, this cylinder jacket comprises outer cylindrical body and inner cylindrical body, described outer cylindrical body and described inner cylindrical body from the outside by described outer cylindrical body and such being disposed in order of described inner cylindrical body, wherein, described inner cylindrical body and described outer cylindrical body comprise dissimilar Al-Si alloys.

In this cylinder jacket, described periphery with described in comprise different materials week, thereby performance is also different.Therefore, described cylinder jacket can suitably be used in periphery and interior week need have under the situation of different performance.

Particularly, because piston contacts slidably with described internal perisporium, therefore the wearability of the internal perisporium of described cylinder jacket must be good.Therefore, preferably used than the described outer cylindrical body Al-Si alloy of the used Al-Si alloy of described inner cylindrical body is more wear-resisting.

Linear expansion coefficient difference between the Al-Si alloy of described outer cylindrical body and the material of described cylinder block is preferably 3 * 10 ^-6/ ℃ below.When the linear expansion coefficient of the material of described cylinder block and described outer cylindrical body such as above-mentioned when similar, can obtain the enough bond strengths between described cylinder jacket and the described cylinder block easily.

On the periphery wall of described outer cylindrical body, be preferably formed concaveconvex shape.Because therefore this concaveconvex shape can obtain so-called anchorage effect, thereby can further improve bond strength.

According to another aspect of the invention, a kind of method is provided, this method is used for making the cylinder jacket in the hole of the cylinder block of waiting to be arranged in internal combustion engine, and this method comprises the following steps: first melt of Al-Si alloy is introduced in the rotatable cylindrical die, therefore forms the inner cylindrical body by centrifugal casting; Second melt of the Al-Si alloy of another type is introduced in the described ground floor, rotated described cylindrical die simultaneously, therefore form the outer cylindrical body, to prepare stacked prefabricated component by centrifugal casting; And the internal perisporium of the described prefabricated component of planing.

In the cylinder jacket of making by above-mentioned steps, the performance of described interior week and described periphery can be different.

In aspect this, described outer cylindrical body is used to form the cooldown rate of second melt of described inner cylindrical body as cool metal spare (cooler) with raising.Therefore, described melt solidified before primary crystal Si particle becomes big or close described outer cylindrical body motion.As a result, described inner cylindrical body has the wherein thin homodisperse substantially structure of primary crystal Si particle.

In addition, in aspect this, can only easily make the cylinder jacket that inner periphery and the outer periphery have different performance by the very simple process of in centrifugal casting, utilizing dissimilar melts.

When the Al-Si alloy of the Al-Si of second melt alloy ratio first melt is more wear-resisting, can obtain to have the cylinder jacket of the internal perisporium of high-wearing feature.

In addition, the linear expansion coefficient difference between the material of described cylinder jacket that is formed by first melt and cylinder block is 3 * 10 ^-6/ ℃ below the time, can obtain the enough bond strengths between described cylinder jacket and the described cylinder block easily.

Description of drawings

Fig. 1 is an overall schematic isometric of representing hollow part according to an embodiment of the present invention;

Fig. 2 is the schematic configuration diagram of major part of the centrifugal casting machine of the expression hollow part that is used for shop drawings 1;

Fig. 3 be expression utilize that the centrifugal casting machine of Fig. 2 forms the outer cylindrical body vertically analyse and observe key diagram;

Fig. 4 be illustrated in the outer cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Fig. 5 be expression utilize that the centrifugal casting machine of Fig. 2 forms the inner cylindrical body vertically analyse and observe key diagram;

Fig. 6 be illustrated in the inner cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Fig. 7 is the overall schematic isometric that expression is used to form the prefabricated component of the cylinder jacket of another embodiment according to the present invention;

Fig. 8 is the schematic configuration diagram of major part of the centrifugal casting machine of the expression prefabricated component that is used for shop drawings 7;

Fig. 9 be expression utilize that the centrifugal casting machine of Fig. 8 forms the outer cylindrical body vertically analyse and observe key diagram;

Figure 10 be illustrated in the outer cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Figure 11 be expression utilize that the centrifugal casting machine of Fig. 8 forms the inner cylindrical body vertically analyse and observe key diagram;

Figure 12 be illustrated in the inner cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Figure 13 is the schematic configuration diagram of the major part of another centrifugal casting machine of expression;

Figure 14 is that the partial vertical that the melt of the centrifugal casting machine of expression Figure 13 is filled the major part of pipe and storage melt stove is analysed and observe the schematic construction key diagram;

Figure 15 is that expression is with the analyse and observe key diagram of melt along the cylindrical die of the centrifugal casting machine of vertically guiding to Figure 13 of cylindrical die;

Figure 16 is that expression is by the analyse and observe key diagram of bar-shaped heater along the internal perisporium of vertical heating cylindrical body of cylindrical die;

Figure 17 is the overall schematic isometric that expression is used to form the prefabricated component of the cylinder jacket of another embodiment according to the present invention;

Figure 18 is the schematic configuration diagram of major part of the centrifugal casting machine of the expression prefabricated component that is used to make Figure 17;

Figure 19 be in the cylindrical die of the expression centrifugal casting machine that inserts Figure 18 the outer cylindrical formed body radially analyse and observe key diagram;

Figure 20 be expression utilize that the centrifugal casting machine of Figure 18 forms the inner cylindrical body of casting vertically analyse and observe key diagram;

Figure 21 be illustrated in the inner cylindrical body of casting that forms in the centrifugal casting machine radially analyse and observe key diagram;

Figure 22 is the overall schematic isometric that expression is used to form the prefabricated component of the cylinder jacket of another embodiment according to the present invention;

Figure 23 is the schematic configuration diagram of major part of centrifugal casting machine that is used to make the prefabricated component of Figure 22;

Figure 24 be expression utilize that the centrifugal casting machine of Figure 23 forms the outer cylindrical body vertically analyse and observe key diagram;

Figure 25 be illustrated in the outer cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Figure 26 be expression utilize that the centrifugal casting machine of Figure 23 forms the inner cylindrical body vertically analyse and observe key diagram;

Figure 27 be illustrated in the inner cylindrical body that forms in the centrifugal casting machine radially analyse and observe key diagram;

Figure 28 is the schematic configuration diagram of the major part of another centrifugal casting machine of expression;

Figure 29 is that the partial vertical that the melt of the centrifugal casting machine of expression Figure 28 is filled the major part of pipe and storage melt stove is analysed and observe the schematic construction key diagram;

Figure 30 is the key diagram of representing wherein to begin along the state of the cylindrical die of the centrifugal casting machine of vertically melt being guided to Figure 28 of cylindrical die of analysing and observe;

Figure 31 is that expression is by the analyse and observe key diagram of bar-shaped heater along the internal perisporium of vertical heating cylindrical body of cylindrical die.

The specific embodiment

Hereinafter with reference to a plurality of preferred implementations of accompanying drawing detailed description according to hollow part of the present invention and manufacture method.

Below first embodiment will be described.In the first embodiment, utilize powder to form cylindrical body, melt is added in the cylindrical body, to form the tubular body of casting.

Fig. 1 is the overall schematic isometric according to the hollow part 10 of first embodiment.Hollow part 10 is inner cylindrical body 12 and outer cylindrical body 14 stacked.

In this embodiment, inner cylindrical body 12 is the body of casting by the Al-23%Si alloy composition.As described below, inner cylindrical body 12 forms by cooling and solidified melt.The thickness T 1 of inner cylindrical body 12 is approximately 5mm to 6mm.

In inner cylindrical body 12, average diameter is that the following thin primary crystal Si particle of 35 μ m anisotropically is distributed in (near the outer cylindrical body 14) around the periphery wall, and disperses substantially equably along diametric(al).In addition, primary crystal Si particle has smaller particles Size Distribution width.In other words, be dispersed in the structure of inner cylindrical body 12 to the approximately equalised thin primary crystal Si uniform particles of size.

On the other hand, form outer cylindrical body 14 by the powder particle that melts the Al-12%Si alloy each other.The internal perisporium of outer cylindrical body 14 is connected with the periphery wall of inner cylindrical body 12.The thickness T 2 of outer cylindrical body 14 is preferably 0.5mm to 2mm.

The internal perisporium of hollow part 10 (that is, the inner cylindrical body 12) is made cylinder jacket through planing.In other words, inner cylindrical body 12 is thinned to predetermined thickness.Therefore, inner cylindrical body 12 forms the allowance of hollow part 10.

As mentioned above, the approximately equalised thin primary crystal Si particle of size radially is evenly dispersed in the inner cylindrical body 12.The internal perisporium high abrasion resistance that slidably contacts with piston of the hollow part of therefore, having processed 10 (cylinder jacket).In addition, the hollow part of having processed 10 totally is rendered as high strength.Therefore, comprise that the durability of internal combustion engine of this cylinder jacket is good.

The method of utilizing centrifugal casting machine shown in Figure 2 20 to make hollow part 10 below will be described.

Centrifugal casting machine 20 comprises the cylindrical die 22 that level of approximation is placed.On the periphery wall of cylindrical die 22, form two cannelures 24,24, thereby periphery wall is along the circumferential direction otch.The periphery wall of pair of rolls 26,26 contacts slidably with the bottom of each cannelure 24.Therefore, cylindrical die 22 is supported by two pair rollers.

Four rollers 26 are connected with the rotary driving source (not shown).Each roller 26 rotates cylindrical die 22 rotations thus by rotary driving source.

Plate-like closing feature 30 is assemblied in the end of cylindrical die 22, and annular frame 32 is attached to the other end.Annular frame 32 openings and form through hole 34, the powder feeder 36 of groove 40a or melt are filled pipe 42a and are inserted the cylindrical dies 22 from through hole 34.

Powder feeder 36 is stretched out from powder reservoir (not shown).The powder reservoir can be shifted by the shift mechanism (not shown), and this cylindrical die 22 be removed or be moved on to powder feeder 36 can from cylindrical die 22 according to this displacement.As the powder storage of the Al-12%Si alloy of the material of outer cylindrical body 14 in the powder reservoir.

The melt L1 that is used to form inner cylindrical body 12 is contained in the main body of groove 40a.Tiltable jar of 44a is arranged near the groove 40a, and melt L1 guides to groove 40a from jar 44a.

During in the mill empty parts 10, apply coating material, then powder feeder 36 is inserted the cylindrical dies 22 from through hole 34 to the internal perisporium of cylindrical die 22.In this step, as shown in Figure 3, an end of powder feeder 36 is positioned near the plate-like closing feature 30.Though the melt of not shown groove 40a is filled pipe 42a among Fig. 3, melt is filled pipe 42a can be located such that it does not interfere powder feeder 36.

Roller 26 rotates under this state, cylindrical die 22 rotations thus.Then, the powder P with the Al-12%Si alloy introduces the cylindrical die 22 from powder feeder 36.

In this step, cylindrical die 22 preferably rotates with the G number more than 30.Powder P is forced into the internal perisporium of cylindrical die 22 because of centrifugal force, and forms cylindrical body.

The direction of powder feeder 36 along arrow X shown in Figure 3 moved backward, introduce powder P simultaneously.Powder P is because motion and along vertically the introducing substantially equably of cylindrical die 22 backward, thereby cylindrical body is extended continuously in short transverse.As a result, as shown in Figure 4, form the outer cylindrical body 14 of the internal perisporium that is attached to cylindrical die 22.

Then, the melt L1 of the Al-23%Si alloy that will prepare in smelting furnace is transported to a jar 44a, and melt L1 further is transported to the main body of groove 40a by jar 44a is tilted.Therefore, as shown in Figure 5, melt L1 is filled pipe 42a from the melt of groove 40a introduce the cylindrical die 22.The melt L1 that is introduced scatters towards plate-like closing feature 30 because of mobile.It should be noted that in cylindrical die 22 rotations and introduce melt L1.

Most of melt L1 are distributed in because of centrifugal force on the internal perisporium of outer cylindrical body 14, to form inner cylindrical body 12, as shown in Figure 6.Simultaneously, part melt L1 penetrates outer cylindrical body 14.Inner cylindrical body 12 on the outer cylindrical body 14 and the melt L1 temperature height that penetrates outer cylindrical body 14, the powder of outer cylindrical body 14 melts the formation liquid phase slightly thus.When cooling and during solidified melt L1, also make liquid phase cools and solidify.As a result, powder particle fuses each other, thereby the toughness of outer cylindrical body 14 is improved, to obtain hollow part 10.

The thorn of coating material is transferred on the periphery wall of outer cylindrical body 14.In addition, the internal perisporium of outer cylindrical body 14 is connected with the periphery wall of inner cylindrical body 12.

Because outer cylindrical body 14 is as cool metal spare (cooler), therefore, the cooldown rate of melt L1 is than the cooldown rate height of common centre spinning in first embodiment.Therefore, melt L1 solidified before primary crystal Si particle becomes greatly, comprised the structure of thin primary crystal Si particle with formation.The average diameter of primary crystal Si particle is approximately below the 35 μ m.

In addition, because the cooldown rate height, so the Si particle of melt L1 in this melt L1 solidified before periphery wall moves because of centrifugal force.Prevented the non-uniform Distribution of primary crystal Si particle, and primary crystal Si particle is along the radially dispersion substantially equably of inner cylindrical body 12.Therefore, by outer cylindrical body 14 is used as cooler, the approximately equalised thin primary crystal Si particle of size can be evenly dispersed in the inner cylindrical body 12.

After the end separating of annular frame 32 and cylindrical die 22, the hollow part 10 with inner cylindrical body 12 connected to one another and outer cylindrical body 14 is pulled out from the end with coating material.Then; be attached to the coating material of the periphery wall of outer cylindrical body 14 by removals such as bead; and remove predetermined allowance by the internal perisporium of planing inner cylindrical body 12, to obtain to have the cylinder jacket of inner cylindrical body 12, wherein primary crystal Si particle is basic evenly disperses.

When forming inner cylindrical body 12 by centrifugal casting, primary crystal Si particle can distribute slightly unevenly, and the grain amount around the outer cylindrical body 14 can be greater than the grain amount of mid portion (around the internal perisporium of inner cylindrical body 12) radially.Yet, the internal perisporium of the hollow part 10 of planing as mentioned above, thus the part with low Si content is removed as allowance.Therefore, the cylinder jacket of formation has enough primary crystal Si granule contents.

As mentioned above, in the first embodiment, can make the hollow part 10 of the prefabricated component of the cylinder jacket that can be suitable for use as intensity and high abrasion resistance.

In addition, in the first embodiment, utilize powder, therefore do not need to be used for the process and the cost of melting powder as the material that forms outer cylindrical body 14.And do not need to be used for the smelting furnace of melting powder.Therefore, can prevent that equipment cost from increasing, and can make hollow part 10 originally with the one-tenth that reduces.

And in the first embodiment, outer cylindrical body 14 reduces primary crystal Si particle size as cooler, needn't strictly control casting condition thus, for example needn't strict control cylindrical die rotating speed and temperature.

The cylinder jacket that is obtained is placed in the cavity of the mold that is used for casting the cylinder block that the internal combustion engine that is formed on automobile uses.The melt of aluminium etc. is guided to cavity, and cooling and solidifying, cylinder block formed with casting.Therefore, around cylinder jacket casting cylinder block, thereby the internal combustion engine durability that comprises this cylinder jacket is good.

Though in the first embodiment, the Al-12%Si alloy is used to form the powder of outer cylindrical body 14, this powder can be by Al or another Al alloy composition.The material that is used to form the melt L1 of inner cylindrical body 12 is not limited to the Al-23%Si alloy, so melt L1 can be by Al-Si alloy composition arbitrarily.

Below second embodiment will be described.In second embodiment, utilize melt to form the tubular body of casting, then the melt of same type is introduced in the tubular body of casting to make hollow part.

Fig. 7 is that expression is used to form the overall schematic isometric according to the pre-part spare 110 of the cylinder jacket of second embodiment.Prefabricated component 110 is stacks of inner cylindrical body 112 and outer cylindrical body 114, and is the hollow part with the through hole that extends longitudinally.

In this embodiment, inner cylindrical body 112 is made up of Al-17%-23%Si-2.5%Cu alloy (being the equivalent material (JIS, Al-17%Si alloy) of A390 or the equivalent material (Al-23%Si alloy) of AC9A).As described below, inner cylindrical body 112 is the body of castings that form by cooling and solidified melt.The thickness T 3 of inner cylindrical body 112 is approximately 5mm to 6mm.

In inner cylindrical body 112, average diameter is that the following thin primary crystal Si particle of 35 μ m anisotropically is distributed in around the periphery wall (outer cylindrical body 114 near), and radially disperses substantially equably.In addition, the particle size distribution width of primary crystal Si particle is less.In other words, be dispersed in the structure of inner cylindrical body 112 to the approximately equalised thin primary crystal Si uniform particles of size.

The body of casting that outer cylindrical body 114 also is made up of Al-17%-23%Si-2.5%Cu alloy (being the equivalent material of A390 or the equivalent material of AC9A).Therefore, outer cylindrical body 114 and inner cylindrical body 112 comprise the aluminium alloy of same type, and the internal perisporium of outer cylindrical body 114 is connected with the periphery wall of inner cylindrical body 112.The thickness T 4 of outer cylindrical body 114 is preferably 0.5mm to 2.0mm.

The planing prefabricated component 110 internal perisporium (that is, the inner cylindrical body 112) and make cylinder jacket.In other words, inner cylindrical body 112 is thinned to predetermined thickness.Therefore, inner cylindrical body 112 forms the allowance of prefabricated component 110.

As mentioned above, the approximately equalised thin primary crystal Si particle of size radially is evenly dispersed in the inner cylindrical body 112.The high abrasion resistance of the internal perisporium that can contact slidably with piston of the pre-part system 110 (cylinder jacket) of therefore, having processed.In addition, processed prefabricated member 110 totally is rendered as high strength.Therefore, it is good to comprise the internal combustion engine durability of this cylinder jacket.

The method of utilizing centrifugal casting machine shown in Figure 8 120 to make cylinder jacket below will be described.In Fig. 2 to Fig. 6 and following figure, identical parts are marked with identical Reference numeral.

The structure of the structure of centrifugal casting machine 120 and centrifugal casting machine 20 is basic identical, and comprises the cylindrical die 22 that level of approximation is placed.On the periphery wall of cylindrical die 22, form cannelure 24,24, thereby periphery wall is along circumferential cut.The periphery wall of pair of rolls 26,26 contacts slidably with the bottom of each cannelure 24.Therefore, cylindrical die 22 is supported by this two pair roller.Each roller 26 is by the rotation of rotary driving source (not shown), and cylindrical die 22 rotates thus.

Plate-like closing feature 30 is assembled in the end of cylindrical die 22, and annular frame 32 is attached to the other end.The melt of groove 40b is filled the through hole 34 of pipe 42b from be formed on annular frame 32 and is inserted in the cylindrical die 22.

The melt L2 that is used to form the Al-17%-23%Si-2.5%Cu alloy of outer cylindrical body 114 and inner cylindrical body 112 is contained in the main body of groove 40b.Tiltable jar 44b be arranged in groove 40b near, melt L2 guides to groove 40b from jar 44b.

When making cylinder jacket, the melt L2 of the Al-17%-23%Si-2.5%Cu alloy that will prepare in smelting furnace is transported to a jar 44b, and further melt L2 is transported to the main body of groove 40b by jar 44b is tilted.Internal perisporium to cylindrical die 22 applies coating material, and then as shown in Figure 9, the melt of groove 40b is filled pipe 42b and inserted the cylindrical die 22 from through hole 34.

Roller 26 rotates under this state, cylindrical die 22 rotations thus.Then, the melt L2 of the Al-17%-23%Si-2.5%Cu alloy of scheduled volume introduces the cylindrical die 22 from groove 40b, and vertically flowing along cylindrical die 22.Melt L2 is on the internal perisporium that tubular is distributed in cylindrical die 22 because of centrifugal force, to form outer cylindrical body 114.In second embodiment, melt L2 is supplied in and makes that the thickness of outer cylindrical body 114 is 0.5mm to 2.0mm.

Outside during the formation of cylindrical body 114, the thorn of coating material is transferred on the periphery wall of this outer cylindrical body 114.The melt L2 of Al-17%-23%Si-2.5%Cu alloy further is fed to a jar 44b.

Finish melt L2 guided to cylindrical die 22 after, melt L2 is transported to the main body of groove 40b by jar 44b is tilted.Outside the temperature of cylindrical body 114 reduce to the liquid-solid phase line temperature of phasor following after, for example, preferably cylindrical body 114 was under some condition after 8 to 25 seconds outside, immediately melt conveying L2.Then, as shown in figure 11, melt L2 is filled pipe 42 from the melt of groove 40b introduce the cylindrical die 22.The melt L2 that is introduced scatters towards plate-like closing feature 30 owing to flowability.It should be noted that in rotation cylindrical die 22 and introduce melt L2.

As shown in figure 12, melt L2 is distributed in because of centrifugal force on the internal perisporium of outer cylindrical body 114, to form inner cylindrical body 112.In the prefabricated component 110 that forms, outer cylindrical body 114 is stacked on the inner cylindrical body 112, and the internal perisporium of outer cylindrical body 114 is connected with the periphery wall of inner cylindrical body 112.

When cooling off and solidifying inner cylindrical body 112, outer cylindrical body 114 is as cool metal spare (cooler).Therefore, in second embodiment cooldown rate of melt L2 than the cooldown rate height of common centrifugal casting.Therefore, melt L2 solidified before primary crystal Si particle becomes greatly, comprised the structure of thin primary crystal Si particle with formation.The average diameter of primary crystal Si particle is approximately below the 35 μ m.

In addition, because the cooldown rate height, so the Si particle of melt L2 in this melt L2 solidified before the periphery wall motion because of centrifugal force.Prevent that primary crystal Si particle from distributing unevenly, and primary crystal Si particle is along the radially dispersion substantially equably of inner cylindrical body 112.Therefore, by outer cylindrical body 114 is used as cooler, the approximately equalised thin primary crystal Si particle of size can be evenly dispersed in the inner cylindrical body 112.

After the end separating of cylindrical die 22, the prefabricated component 110 with inner cylindrical body 112 connected to one another and outer cylindrical body 114 is pulled out from the end with coating material at annular frame 32.Then; be attached to the coating material of the periphery wall of outer cylindrical body 114 by removals such as bead; and remove predetermined allowance by the internal perisporium of planing inner cylindrical body 112, to obtain to have the cylinder jacket of inner cylindrical body 112, wherein primary crystal Si particle is basic evenly disperses.

When forming inner cylindrical body 112 by centrifugal casting, primary crystal Si particle can distribute slightly unevenly, and the grain amount around the outer cylindrical body 114 can be greater than the grain amount of mid portion (around the internal perisporium of inner cylindrical body 112) radially.Yet, the internal perisporium of prefabricated component 110 of planing as mentioned above, thus the part with low Si content is removed as allowance.Therefore, formed cylinder jacket has enough primary crystal Si granule contents.

As mentioned above, in second embodiment, can make the cylinder jacket of intensity and high abrasion resistance.

In addition, in second embodiment, outer cylindrical body 114 is used as the size that cooler reduces primary crystal Si particle, needn't strictly controls casting condition thus, for example needn't strict control cylindrical die rotating speed and temperature.

The cylinder jacket that is obtained is placed in the cavity of the mold that is used for casting the cylinder block that the internal combustion engine that is formed on automobile uses.The metal bath that is used to form cylinder block is introduced cavity.Therefore, around cylinder jacket casting cylinder block, to make internal combustion engine.When cylinder jacket was cast, the thorn on cylinder jacket (the outer cylindrical body 114) periphery wall was as anchoring piece, to obtain the enough bond strengths between cylinder jacket and the cylinder block in cylinder block.

In internal combustion engine, piston contacts slidably with the internal perisporium of cylinder jacket.As mentioned above, serve as reasons inner cylindrical body 112 that the equivalent material (Al-23%Si alloy) of the equivalent material (Al-17%Si alloy) of A390 with high primary crystal Si granule content or AC9A is formed so high abrasion resistance of the internal perisporium of cylinder jacket.

As mentioned above, the cylinder jacket of making in second embodiment is with respect to the bond strength of cylinder block, and the high abrasion resistance of the internal perisporium that can contact slidably with piston.

Melt L2 can introduce in the cylindrical die 22 of the centrifugal casting machine 150 shown in Figure 13.This remodeling example is below described.

In this embodiment, melt is filled in the through hole 34 of pipe 152 insertion annular frames 32.In other words, melt being filled pipe 152 introduces the cylindrical die 22 from through hole 34.

Melt fill pipe 152 by four bar-shaped heater 154 around.First grip block 156, the first insertion gripper shoe 158, the second insertion gripper shoe 160 and second grip block 162 are filled the top of pipe 152 and are also fixed according to this positioned in sequence from melt.Melt is filled pipe 152 and is inserted in the central through hole of plate, and the two ends of each bar-shaped heater 154 all are folded between first grip block 156 and second grip block 162.In addition, the mid portion of each bar-shaped heater 154 is supported for and makes bar-shaped heater 154 insert in the small through hole that first central through hole that inserts the gripper shoe 158 and the second insertion gripper shoe 160 forms.

As shown in figure 14, melt filling pipe 152 is connected with storage melt stove 166 by supply pipe 164.Therefore, melt is filled pipe 152 and is connected by supply pipe 164 with storage melt stove 166, makes that filling the flexible pipes 168 of managing 152 extensions from melt is similar to down L shaped and is connected from the L shaped pipe 170 that falls of storage melt stove 166 extensions with having.

Arrange wheel 172 in the bottom of storage melt stove 166, each take turns 172 be arranged in cell floor on guide rail 174 engage slidably.Therefore, storage melt stove 166 is shifted along guide rail 174 by making wheel 172 rotations.

Arrange heat-barrier material 176 in storage melt stove 166, heat-barrier material 176 is around melt reservoir 178.The immersion heater (not shown) inserts in the melt reservoir 178, is stored in the melt L2 of the Al-17%-23%Si-2.5%Cu alloy in the melt reservoir 178 with heating, keeps by heat-barrier material 176 through the temperature of the melt L2 of heating.

In the part of the upper end of melt reservoir 178, be formed for introducing the opening of melt.This opening is closed by covering 180.

Lid 180 has two through holes, and supply pipe 164 above-mentioned falls L shaped pipe 170 and insert in one of them through hole.The end of L shaped pipe 170 of falling is immersed among the melt L2.The air supply pipe 182 that extends from argon gas source of supply (not shown) inserts another through hole, and it is arranged to separate slight distance with the surface of melt L2.

When the centrifugal casting machine 150 that has this structure in utilization is made prefabricated components 110, apply coating material, rotate roller 26 then, cylindrical die 22 rotations thus to the internal perisporium of cylindrical die 22.Simultaneously, argon gas (inert gas) is introduced the melt reservoir 178 of storage melt stove 166 by air supply pipe 182 from the argon gas source of supply.

In melt reservoir 178, melt L2 is under the pressure of argon gas.By increasing argon pressure, the melt L2 in the L shaped pipe 170 is raise, and melt L2 is transported to melt filling pipe 152 by flexible pipe 168.In this embodiment, melt L2 is transported to cylindrical die 22 from storage melt stove 166 by this way by inert gas pressure, thereby hardly in conjunction with air, obviously also hardly in conjunction with inert gas.

As shown in figure 15, melt is filled pipe 152 and is inserted in the cylindrical dies 22, make described end be positioned at plate-like closing feature 30 near.Therefore, melt L2 is supplied near plate-like closing feature 30, flows towards annular frame 32 then.

In rotation cylindrical die 22, introduce melt L2.Therefore, as shown in figure 16, melt L2 is distributed in because of centrifugal force on the internal perisporium of cylindrical die 22, to form outer cylindrical body 114.Can just stop to introduce melt L2 when to form thickness be 0.5 to 2.0mm outer cylindrical body 114 in the amount of introducing melt L2.

Outside the temperature of cylindrical body 114 reduce to the liquid-solid phase line temperature of phasor following after, restart to introduce melt L2 immediately, to form inner cylindrical body 112.Heating bar-shaped heater 154 before restarting introducing.For example, total heat value of bar-shaped heater 154 is about 30kW.

In this embodiment, melt L2 is supplied in and makes that the thickness of final prefabricated component 110 is 5mm to 6mm.Therefore, the gap between the internal perisporium of each bar-shaped heater 154 and prefabricated component 110 is about 5mm.Even when being attached to air or another gas among the melt L2,, therefore in prefabricated component 110, produce bubble (internal flaw) hardly as mentioned above because gas flow is few.The inventor confirms, and is when being 5mm in the gap, minimum in conjunction with the amount of gas.

Then, cooling and solidified melt L2 when remaining on melt filling pipe 152 in the cylindrical die 22.As mentioned above, owing to heat bar-shaped heater 154 in advance, so the internal perisporium of inner cylindrical body 112 heats by bar-shaped heater 154 when cooled and solidified.Simultaneously, the periphery wall of inner cylindrical body 112 contacts with the outer cylindrical body 114 that solidifies.Therefore, in inner cylindrical body 112, the cooldown rate around the periphery wall is than the cooldown rate height around the internal perisporium.

Inner cylindrical body 112 has such thermal gradient, and because the cooldown rate at internal perisporium place is lower than the cooldown rate at periphery wall place, therefore solidifies the long time of internal perisporium cost.Thereby even when producing bubble argon gas being attached among the melt L2, bubble also can move towards internal perisporium.

On the other hand,, prevent that therefore the change of primary crystal Si particle is big, and prevent the primary crystal Si particle roughening that around periphery wall, becomes because cooldown rate is higher.Therefore, in the inner cylindrical body 112 of this embodiment, thin primary crystal Si particle is dispersed in around the periphery wall, so defective concentrates on around the internal perisporium.

Then, apply power to storage melt stove 166, storage melt stove 166 is shifted away from cylindrical die 22 along guide rail 174 thus.The wheel 172 at place, storage melt stove 166 bottoms rotates in this step.

Along with the above-mentioned displacement of melt stove 166, melt filling pipe 152 and bar-shaped heater 154 are drawn from cylindrical die 22.Storage melt stove 166 moves to the melt supply station and stops in the melt supply station, and melt L2 is fed to melt reservoir 178.

After annular frame 32 breaks away from from the end of cylindrical die 22, prefabricated component 110 is pulled out from the end with coating material.Then, the periphery wall of prefabricated component 110 is through removal coating materials such as bead, and the internal perisporium of planing prefabricated component 110, makes and removes the internal perisporium with concentrated defective, and keep the periphery wall with homodisperse substantially thin primary crystal Si particle.The internal flaw of the cylinder jacket of Huo Deing is considerably less and thin primary crystal Si granule content is very high like this, so intensity and high abrasion resistance.Concaveconvex shape on the coating material is transferred on the periphery wall of cylinder jacket, to form thorn.

Under with the situation of Al-17%-23%Si-2.5%Cu alloy as inner cylindrical body 112 and outer cylindrical body 114, the component of alloy needn't be strict identical.The equivalent material of A390 is the aluminium alloy that comprises 17% to 18% Si.For example, comprise the equivalent material of A390 of 17% Si and the equivalent material that comprises the A390 of 18% Si and can be respectively applied for outer cylindrical body 114 and inner cylindrical body 112.

Though in second embodiment with the equivalent material of the equivalent material of A390 or AC9A inner cylindrical body 112 and outer cylindrical body 114 as cylinder jacket, but specifically do not limit the material of cylindrical body, and can be from material such as selection cylindrical body other aluminium alloy of ADC10 (JIS) and ADC12 (JIS).

The thickness T 4 of outer cylindrical body 114 is not limited to 0.5mm to 2.0mm, and can select according to the cooling velocity of control inner cylindrical body 112, to obtain desired results.

Below the 3rd embodiment will be described.In the 3rd embodiment,, make hollow part by in the tubular organizator, adding melt to form the tubular body of casting.

Figure 17 is that expression is used to form the overall schematic isometric according to the prefabricated component 210 of the cylinder jacket of the 3rd embodiment.Prefabricated component 210 is stacks of the inner cylindrical body of casting 212 and outer cylindrical organizator 214, and for having the hollow part of the through hole that extends longitudinally.

In this embodiment, the inner cylindrical body of casting 212 is the body of casting by the Al-23%Si alloy composition.As described below, form the inner cylindrical body of casting 212 by cooling and solidified melt.The thickness T 5 of the inner cylindrical body of casting 212 is about 5mm to 6mm.

In the inner cylindrical body of casting 212, average diameter is that the following thin primary crystal Si uniform particles ground of 35 μ m is distributed in around the periphery wall (outer cylindrical organizator 214 near) and radially dispersion substantially equably.And the particle size distribution width of primary crystal Si particle is less.In other words, be dispersed in the structure of the inner cylindrical body of casting 212 to the approximately equalised thin primary crystal Si uniform particles of size.

On the other hand, outer cylindrical organizator 214 is made up of Al-11%Si-2.5%Cu alloy (ADC12) etc.The internal perisporium of outer cylindrical organizator 214 is connected with the periphery wall of the inner cylindrical body of casting 212.Shown in Figure 18 and 19, outer cylindrical organizator 214 inserted in the cylindrical die 22 of centrifugal casting machine 220 before forming the inner cylindrical body of casting 212.The thickness T 6 of outer cylindrical organizator 214 is preferably 1.0 to 2.0mm.

The internal perisporium (that is, the inner cylindrical body of casting 212) of planing prefabricated component 210 is to make cylinder jacket.In other words, the inner cylindrical body of casting 212 is thinned to predetermined thickness.Therefore, the inner cylindrical body of casting 212 forms the allowance of prefabricated component 210.

As mentioned above, the approximately equalised thin primary crystal Si particle of size radially is evenly dispersed in the inner cylindrical body of casting 212.Therefore, the high abrasion resistance of the internal perisporium that can contact slidably with piston of processed prefabricated member 210 (cylinder jacket).In addition, processed prefabricated member 210 totally is rendered as high strength.Therefore, it is good to comprise the internal combustion engine durability of this cylinder jacket.

The method of utilizing centrifugal casting machine shown in Figure 180 220 to make cylinder jacket below will be described.In Fig. 2 to 6, Fig. 8 to 12 and following figure, identical parts are marked with identical Reference numeral.

The structure of the structure of centrifugal casting machine 220 and centrifugal casting machine 20,120 is basic identical, and comprises the cylindrical die 22 that level of approximation is placed.On the periphery wall of cylindrical die 22, form two cannelures 24,24, thereby periphery wall is along circumferential cut.

The periphery wall of pair of rolls 26,26 contacts slidably with the bottom of each cannelure 24.Therefore, each roller 26 rotates by the rotary driving source (not shown), cylindrical die 22 rotations thus.

Plate-like closing feature 30 is assemblied in the end of cylindrical die 22, and annular frame 32 is attached to the other end.The melt of groove 40c is filled the through hole 34 of pipe 42c from be formed on annular frame 32 and is inserted in the cylindrical die 22.

The melt L3 that is used to form the Al-23%Si alloy of the inner cylindrical body of casting 212 is contained in the main body of groove 40c.Tiltable jar 44c is arranged near the groove 40c, and melt L3 guides to groove 40c from jar 44c.

When making cylinder jacket, shown in Figure 18 and 19, ADC12 cylinder (that is, the outer cylindrical organizator 214) inserts in the cylindrical die 22.The external diameter of outer cylindrical organizator 214 is corresponding with the internal diameter of cylindrical die 22, and outer cylindrical organizator 214 and cylindrical die 22 separate hardly thus.

At this state backspin transfer roller 26, cylindrical die 22 rotations thus.Loose degree between outer cylindrical organizator 214 and the cylindrical die 22 obviously diminishes as mentioned above, so not vibration in cylindrical die 22 of outer cylindrical organizator 214.

Then, as shown in figure 20, the melt of groove 40c is filled pipe 42c and is inserted the cylindrical die 22 from through hole 34.The melt L3 of the Al-23%Si alloy that will prepare in molten stove is transported to a jar 44c, and melt L3 further is transported in the main body of groove 40c by jar 44c is tilted.The melt L3 of the Al-23%Si alloy of scheduled volume guides to the outer cylindrical organizator 214 from groove 40c, and longitudinally flows towards plate-like closing feature 30.Melt L3 is distributed in tubular on the internal perisporium of outer cylindrical organizator 214 because of centrifugal force, to form the inner cylindrical body of casting 212.In the 3rd embodiment, the amount of the melt L3 that is supplied is adjusted into and makes that the thickness of the inner cylindrical body of casting 212 is 5mm to 6mm.

Form the inner cylindrical body of casting 212 as shown in Figure 21 by this way.In the prefabricated component 210 that obtains like this, outer cylindrical organizator 214 is stacked on the inner cylindrical body of casting 212, and the internal perisporium of outer cylindrical organizator 214 is connected with the periphery wall of the inner cylindrical body of casting 212.

When cooling off and solidifying the inner cylindrical body of casting 212, outer cylindrical organizator 214 is as cool metal spare (cooler).Therefore, the cooldown rate of the melt L3 in the 3rd embodiment is than the cooldown rate height in the common centre spinning.Therefore, melt L3 solidified before primary crystal Si particle becomes greatly, comprised the structure of thin primary crystal Si particle with formation.In the 3rd embodiment, the thickness T 6 of outer cylindrical organizator 214 is 1.0mm to 2.0mm, and the average diameter of primary crystal Si particle is approximately below the 35 μ m.

In addition, because the cooldown rate height, so the Si particle of melt L3 in this melt L3 solidified before the periphery wall motion because of centrifugal force.Prevent that primary crystal Si particle from distributing unevenly, and primary crystal Si particle is along the radially dispersion substantially equably of the inner cylindrical body of casting 212.Therefore, by outer cylindrical organizator 214 is used as cooler, the approximately equalised thin primary crystal Si particle of size can be evenly dispersed in the inner cylindrical body of casting 212.

After the end separating of cylindrical die 22, the prefabricated component 210 with the inner cylindrical body of casting 212 connected to one another and outer cylindrical organizator 214 is pulled out from the end with coating material at annular frame 32.Then; the periphery wall of outer cylindrical organizator 214 is through bead etc. and form tiny concaveconvex shape; and remove predetermined allowance by the internal perisporium of the planing inner cylindrical body of casting 212, to obtain having the cylinder jacket of the inner cylindrical body of casting 212, wherein primary crystal Si particle disperses substantially equably.

When forming the inner cylindrical body of casting 212 by centrifugal casting, primary crystal Si particle can distribute slightly unevenly, and the grain amount around the outer cylindrical organizator 214 can be greater than the grain amount in the mid portion (around the internal perisporium of the inner cylindrical body of casting 212) radially.Yet, the internal perisporium of the prefabricated component 210 of planing as mentioned above, thus the part that will have low Si content is removed as allowance.Therefore, the cylinder jacket of formation has enough primary crystal Si granule contents.

As mentioned above, in the 3rd embodiment, can make the cylinder jacket of intensity and high abrasion resistance.

In addition, in the 3rd embodiment, outer cylindrical organizator 214 reduces the size of primary crystal Si particle as cooler, needn't strictly control casting condition thus, for example needn't strict control cylindrical die rotating speed and temperature.

The cylinder jacket that is obtained is placed in the cavity that is used for casting the mold that forms the cylinder block that car combustion engine uses.The melt that is used to form the ADC12 etc. of cylinder block is guided to cavity.

Therefore, around cylinder jacket casting cylinder block, to make internal combustion engine.In this step, the concaveconvex shape on the periphery wall of cylinder jacket (outer cylindrical organizator 214) is as anchoring piece.Cylinder block and outer cylindrical organizator 214 are made up of ADC12, so their linear expansion coefficient is identical.When the guiding of metal bath and cooled and solidified, cylinder jacket and cylinder block expand with approximately uniform degree and shrink.Therefore, cylinder block breaks away from cylinder jacket hardly, and can be only anchorage effect by the concaveconvex shape between cylinder jacket and the cylinder block keep enough bond strengths.

In internal combustion engine, piston contacts slidably with the internal perisporium of cylinder jacket.As mentioned above, the serve as reasons inner cylindrical body of casting 212 of Al-23%Si alloy composition of the internal perisporium of cylinder jacket with high primary crystal Si granule content, so wearability is very good.Thereby the durability of internal combustion engine is good.

As mentioned above, the high abrasion resistance of the intensity that is attached to cylinder block of the cylinder jacket of in the 3rd embodiment, making and the internal perisporium that slidably contacts with piston.

Though in the 3rd embodiment, ADC12 is used for the outer cylindrical organizator 214 of cylinder jacket, but specifically do not limit the material of outer cylindrical organizator 214, so the material of outer cylindrical organizator 214 can be and the Al-23%Si alloy of the inner cylindrical body of casting 212, another aluminium alloy or the aluminium identical materials of for example ADC 10.

The material of the inner cylindrical body of casting 212 is not limited to the Al-23%Si alloy, can be ADC10 or ADC12 therefore.

The thickness T 6 of outer cylindrical organizator 214 is not limited to 1.0mm to 2.0mm, and can select according to the cooldown rate of the control inner cylindrical body of casting 212, to obtain desired results.

In addition, though cylinder jacket is depicted as hollow part in first to the 3rd above embodiment, hollow part is not limited thereto, and can be any parts.

At last the 4th embodiment will be described.In the cylinder jacket according to the 4th embodiment, periphery and interior week are made up of dissimilar materials.

Figure 22 is that expression is used to form the overall schematic isometric according to the prefabricated component 310 of the cylinder jacket of the 4th embodiment.Prefabricated component 310 is inner cylindrical body 312 and outer cylindrical body 314 stacked.

In this embodiment, inner cylindrical body 312 is made up of Al-17%-23%Si-2.5%Cu alloy (that is the equivalent material (Al-23%Si alloy) of the equivalent material of A390 (Al-17%Si alloy) or AC9A).As described below, the body of casting of inner cylindrical body 312 for forming by cooling and solidified melt.The thickness T 7 of inner cylindrical body 212 is approximately 5mm to 6mm.

In inner cylindrical body 312, average diameter is that the following thin primary crystal Si uniform particles ground of 35 μ m is distributed in (near the outer cylindrical organizator 314) around the periphery wall, and radially dispersion substantially equably.And the particle size distribution width of primary crystal Si particle is less.In other words, be dispersed in the structure of inner cylindrical body 312 to the approximately equalised thin primary crystal Si uniform particles of size.

On the other hand, outer cylindrical organizator 314 is the body of casting of being made up of Al-11%Si-2.5%Cu alloy (ADC12).Outer cylindrical body 314 also forms by cooling and solidified melt, and the internal perisporium of outer cylindrical body 314 is connected with the periphery wall of inner cylindrical body 312.The thickness T 8 of outer cylindrical body 314 is preferably 0.5mm to 2.0mm.

The internal perisporium (being inner cylindrical body 312) of planing prefabricated component 310 is to make cylinder jacket.In other words, inner cylindrical body 312 is thinned to predetermined thickness.Therefore, inner cylindrical body 312 forms the allowance of prefabricated component 310.

As mentioned above, the approximately equalised thin primary crystal Si particle of size radially is evenly dispersed in the inner cylindrical body 312.Therefore, the high abrasion resistance of the internal perisporium that can contact slidably with piston of processed prefabricated member 310 (cylinder jacket).In addition, processed prefabricated member 310 totally is rendered as high strength.Therefore, comprise that the internal combustion engine durability of this cylinder jacket is good.

Below will describe the centrifugal casting machine 320 that utilizes shown in Figure 23 and make the method for cylinder jacket.

The structure of the structure of centrifugal casting machine 320 and centrifugal casting machine 20,120,220 is basic identical.Centrifugal casting machine 320 comprises: the cylindrical die 22 that level of approximation is placed; Be formed on two cannelures 24,24 on the periphery wall of cylindrical die 22; And the roller 26,26 that contacts slidably with cannelure 24,24.Each roller 26 rotation, cylindrical die 22 rotations thus.In addition, according to above identical mode, plate-like closing feature 30 is assemblied in an end of cylindrical die 22, the annular frame 32 with through hole 34 is attached to the other end.

In the 4th embodiment, adopt two groove 40d, 40e and two jar 44d, 44e.The melt of groove 40d is filled the melt of pipe 42d or groove 40e and is filled pipe 42e from through hole 34 insertion cylindrical dies 22.

The melt L4 that is used to form the ADC12 of outer cylindrical body 314 is contained in the main body of groove 40d.Tiltable jar 44d is arranged near the groove 40d, and melt L4 guides to groove 40d from jar 44d.

On the other hand, the melt L5 that is used to form inner cylindrical body 14 is contained in the main body of groove 40e.Tiltable jar 44e is arranged near the groove 40e, and melt L5 guides to groove 40e from jar 44e.

When manufacturing was used for the prefabricated component 310 of cylinder jacket, the ADC12 melt L4 that will prepare in smelting furnace was transported to a jar 44d, and melt L4 further was transported to the main body of groove 40d by jar 44d is tilted.Simultaneously, apply coating material to the internal perisporium of cylindrical die 22, then as shown in figure 24, the melt of groove 40d is filled pipe 42d and is inserted the cylindrical dies 22 from through hole 34.Though the melt of groove 40e not shown in Figure 24 is filled pipe 42e, melt is filled pipe 42e can be located such that it does not interfere groove 40d.

Begin rotation at this state lower roll 26, thus cylindrical die 22 rotations.Then, the ADC12 melt L4 of scheduled volume is guided to the cylindrical die 22 from groove 40d, and vertically flowing along cylindrical die 22.Melt L4 is distributed in tubular on the internal perisporium of cylindrical die 22 because of centrifugal force, as shown in figure 25 to form outer cylindrical body 314.In the 4th embodiment, the amount of the melt L4 that is supplied is adjusted into and makes that the thickness of outer cylindrical body 314 is 0.5mm to 2.0mm.

During cylindrical body 314 formed outside, the thorn of coating material was transferred on the periphery wall of this outer cylindrical body 314.

The melt L5 of the equivalent material (Al-23%Si alloy) of the equivalent material of the A390 that will prepare in smelting furnace (Al-17%Si alloy) or AC9A is transported to a jar 44e, and outside the temperature of cylindrical body 314 reduce to the liquid-solid phase line temperature of phase diagram following after, for example preferably outside cylindrical body 314 be under some condition after 8 to 25 seconds, further melt L5 is transported to the main body of groove 40e immediately by jar 44e is tilted.Then, as shown in figure 26, melt L5 fills pipe 42e from the melt of groove 40e and guides to the cylindrical die 22.The melt L5 that is introduced scatters towards plate-like closing feature 30 owing to flowability.In rotation cylindrical die 22, introduce melt L5.

As shown in figure 27, melt L5 is distributed in because of centrifugal force on the internal perisporium of outer cylindrical body 314, to form inner cylindrical body 312.In the prefabricated component 310 that forms, outer cylindrical body 314 is stacked on the inner cylindrical body 312, so the internal perisporium of outer cylindrical body 314 is connected with the periphery wall of inner cylindrical body 312.

When inner cylindrical body 312 cooled off and solidifies, outer cylindrical body 314 was as cool metal spare (cooler).Therefore, in the 4th embodiment cooldown rate of melt L5 than the cooldown rate height in the common centre spinning.Therefore, melt L5 solidified before primary crystal Si particle becomes greatly, comprised the structure of thin primary crystal Si particle with formation.The average diameter of primary crystal Si particle is approximately below the 35 μ m.

In addition, because the cooldown rate height, so the Si particle of melt L5 in this melt L5 solidified before the periphery wall motion because of centrifugal force.Prevented that primary crystal Si particle from distributing unevenly, and primary crystal Si particle is along the radially dispersion substantially equably of inner cylindrical body 312.Therefore, by outer cylindrical body 314 is used as cooler, the approximately equalised thin primary crystal Si particle of size can be evenly dispersed in the inner cylindrical body 312.

After the end separating of cylindrical die 22, the prefabricated component 310 with inner cylindrical body 312 connected to one another and outer cylindrical body 314 is pulled out from the end with coating material at annular frame 32.Then; be attached to the coating material of the periphery wall of outer cylindrical body 314 through removals such as bead; and remove predetermined allowance by the internal perisporium of planing inner cylindrical body 312, to obtain the having cylinder jacket of inner cylindrical body 312, wherein primary crystal Si particle disperses substantially equably.

When forming inner cylindrical body 312 by centrifugal casting, primary crystal Si particle can distribute slightly unevenly, and the grain amount around the outer cylindrical body 314 can be greater than the grain amount in the mid portion (around the internal perisporium of inner cylindrical body 312) radially.Yet, the internal perisporium of the prefabricated component 310 of planing as mentioned above, thus the part that will have low Si content is removed as allowance.Therefore, the cylinder jacket of formation has enough primary crystal Si granule contents.

As mentioned above, in the 4th embodiment, can make the cylinder jacket of intensity and high abrasion resistance.

In addition, in the 4th embodiment, outer cylindrical body 314 reduces the size of primary crystal Si particle as cooler, needn't strictly control casting condition thus, for example needn't strict control cylindrical die rotating speed and temperature.

The cylinder jacket that is obtained is placed in the cavity that is used for casting the mold that is formed on the cylinder block that car combustion engine uses.The metal bath that is used to form cylinder block is guided in the cavity.

In this embodiment, metal bath is made up of aluminium or Al-9%Si-3%Cu alloy (ADC10 or ADC12).The linear expansion coefficient of the ADC12 of the linear expansion coefficient of aluminium, ADC10 or ADC12 and outer cylindrical body 314 is roughly the same.Cylinder jacket and cylinder block expand with approximately uniform degree when the guiding of metal bath and cooled and solidified and shrink.Therefore, the anchorage effect by the thorn on the periphery wall that is transferred to outer cylindrical body 314 can keep the enough bond strengths between cylinder jacket and the cylinder block.Therefore, around cylinder jacket casting cylinder block, to make internal combustion engine.

In internal combustion engine, piston contacts slidably with the internal perisporium of cylinder jacket.As mentioned above, the internal perisporium of the cylinder jacket inner cylindrical body 312 that the equivalent material of the equivalent material of A390 with high primary crystal Si granule content or AC9A is formed of serving as reasons, so wearability is very good.Thereby the durability of internal combustion engine is good.

As mentioned above, the good strength that is attached to cylinder block of the cylinder jacket of in the 4th embodiment, making, and the high abrasion resistance of the internal perisporium that contacts slidably with piston.

Inner cylindrical body 312 can form by utilizing centrifugal casting machine 350, and the structure of the centrifugal casting machine 150 that uses in the remodeling example of the structure of centrifugal casting machine 350 and second embodiment is identical.Hereinafter with reference to Figure 28 to 31 this remodeling example is described.In Figure 13 to 16 and Figure 28 to 31, identical parts are marked with identical Reference numeral, and omit its repeat specification.

Shown in Figure 28 and 29, the structure of the centrifugal casting machine 350 of this embodiment is identical with structure according to the remodeling example of aforesaid second embodiment, and to operate with the identical mode of this remodeling example.At first, coating material is applied on the internal perisporium of the cylindrical die 22 in the centrifugal casting machine 150, rotates roller 26 then, cylindrical die 22 rotations thus.Then, the melt of groove 40d is filled pipe 42d insert the cylindrical die 22, therefore add the melt L4 of ADC12 from it from through hole 34.After having added the melt L4 of scheduled volume, the melt of groove 40d is filled pipe 42d and is moved rearwards to outside the cylindrical die 22.

Outside the temperature of cylindrical body 314 reduce to the liquid-solid phase line temperature of phase diagram following after, immediately argon gas (inert gas) is guided to the melt reservoir 178 of storage melt stove 166 by air supply pipe 182 from the argon gas source of supply.

In melt reservoir 178, melt L5 is under the pressure of argon gas.By increasing argon pressure, melt L5 is raise in the L shaped pipe 170 falling, and by flexible pipe 168 melt L5 is transported to melt and fills pipe 152.In this embodiment, melt L5 is transported to cylindrical die 22 by inert gas pressure from storage melt stove 166 under this mode, thereby hardly in conjunction with air, certainly also hardly in conjunction with inert gas.

As shown in figure 30, melt is filled pipe 152 insert in the cylindrical die 22, make described end be positioned near the plate-like closing feature 30.Therefore, melt L5 is supplied near plate-like closing feature 30, flows to annular frame 32 then.

In rotation cylindrical die 22, introduce melt L5.Therefore, as shown in figure 31, melt L5 is distributed in because of centrifugal force on the internal perisporium of outer cylindrical body 314, to form inner cylindrical body 312.Heating bar-shaped heater 154 before introducing melt L5.For example, total heat value of bar-shaped heater 154 is about 30kW.

In this embodiment, melt L5 is supplied in and makes that final prefabricated component 310 thickness are 5mm to 6mm.Therefore, the gap between the internal perisporium of each bar-shaped heater 154 and prefabricated component 310 is approximately 5mm.Even when air or another gas are attached among the melt L5,, therefore in prefabricated component 310, produce bubble (internal flaw) hardly as mentioned above because gas flow is minimum.The inventor confirms that when being 5mm in the gap, the amount of the gas of institute's combination is few.

Then, cooling and solidified melt L5 fill melt with pipe 152 simultaneously and remain in the cylindrical die 22.As mentioned above, owing to bar-shaped heater 154 is heated in advance, so the internal perisporium of inner cylindrical body 312 is heated by bar-shaped heater 154 when cooled and solidified.Simultaneously, the internal perisporium of inner cylindrical body 312 contacts with the outer cylindrical body 314 that solidifies.Therefore, in inner cylindrical body 312, the cooldown rate around the periphery wall is than the cooldown rate height around the internal perisporium.

Inner cylindrical body 312 has such thermal gradient, therefore compares with periphery wall, solidifies the long time of internal perisporium cost with lower cooldown rate.Thereby, even be attached among the melt L5 and when producing bubble, bubble also can move towards internal perisporium at argon gas.

On the other hand, because of the cooldown rate height of periphery wall, become big and roughening so prevent the primary crystal Si particle around this periphery wall.Therefore, in the inner cylindrical body 312 of this embodiment, thin primary crystal Si particle is dispersed in around the periphery wall, and defective concentrates on around the internal perisporium.

Then, apply power to storage melt stove 166, storage melt stove 166 is shifted away from cylindrical die 22 along guide rail 174 thus.Wheel 172 rotations at place, storage melt stove 166 bottoms in this step.

Along with the above-mentioned displacement of melt stove 166, melt filling pipe 152 and bar-shaped heater 154 are drawn from cylindrical die 22.Storage melt stove 166 moves to the melt supply station and stops in this melt supply station, thereby melt L5 is fed to melt reservoir 178.

, after the end separating of cylindrical die 22, prefabricated component 310 is pulled out from the end with coating material at annular frame 32.Then, the periphery wall of prefabricated component 310 through bead etc. removing coating material, and the internal perisporium of planing prefabricated component 310, thus remove internal perisporium with concentrated defective, and keep periphery wall with homodisperse substantially thin primary crystal Si particle.The quantity of the internal flaw of the cylinder jacket of Huo Deing is considerably less like this, and thin primary crystal S1 granule content height, thus intensity and high abrasion resistance.Concaveconvex shape on the coating material is transferred on the periphery wall of cylinder jacket, to form thorn.

Though cylinder block is made up of aluminium, ADC10 or ADC12 in the 4th embodiment, and outer cylindrical body 314 is made of ADC12, and the material that can obtain the outer cylindrical body 314 of enough bond strengths is not limited thereto.The material of outer cylindrical body 314 can be any material, as long as the linear expansion coefficient difference between outer cylindrical body 314 and the cylinder block is 3 * 10 ^-6/ ℃ below get final product.In addition, cylinder block can be made up of identical aluminium alloy certainly with outer cylindrical body 314.

The material of inner cylindrical body 312 is not limited to the equivalent material (Al-17%Si alloy) of A390 or the equivalent material (Al-23%Si alloy) of AC9A, can be any Al-Si alloy, as long as its wearability than the Al-Si alloy of outer cylindrical body 314 is bigger.

In addition, the material of inner cylindrical body 312 is not limited to the high-wearing feature material, and the material of outer cylindrical body 314 is not limited to have the material of the linear expansion coefficient similar to cylinder block.Described material can suitably be selected according to the performance of expectation.

Therefore, the thickness T 8 of outer cylindrical body 314 is not limited to 0.5mm to 2.0mm, therefore can obtain desired results according to the cooldown rate of control inner cylindrical body 312.

Claims (24)

1, the hollow part (10) of a kind of basic tubular, stacked type, this hollow part comprises the inner cylindrical body (12) that outer cylindrical body (14) is connected with internal perisporium with this outer cylindrical body, wherein, described outer cylindrical body (14) forms by the powder of fusing aluminum or aluminum alloy, and described inner cylindrical body (12) is by the Al-Si alloy composition.

2, hollow part according to claim 1 (10), wherein, described outer cylindrical body (14) is by the Al-Si alloy composition.

3, a kind of method, by making the hollow part (10) of basic tubular, stacked type in the cylindrical die (22) that melt (L1) is fed to rotation, this method comprises the following steps: this method by centrifugal casting

The powder (P) of aluminum or aluminum alloy is introduced in the cylindrical die (22) of described rotation, to form outer cylindrical body (14); And

The described melt (L1) of Al-Si alloy is guided on the internal perisporium of described outer cylindrical body (14), therefore make described powder (P) fusing, and form the inner cylindrical body (12) of described melt (L1), comprise stacked hollow part (10) of described outer cylindrical body (14) and the described inner cylindrical body (12) that is connected with the described internal perisporium of this outer cylindrical body with manufacturing.

4, method according to claim 3, wherein, the described powder (P) that will be used to form described outer cylindrical body (14) is guided in the described cylindrical die (22), and described cylindrical die (22) rotates with the G number more than 30 (G No.) simultaneously.

5, according to claim 3 or 4 described methods, wherein, described outer cylindrical body (14) is by the Al-Si alloy composition.

6, the hollow part (110) of a kind of basic tubular, stacked type, this hollow part comprises outer cylindrical body (114) and inner cylindrical body (112), described outer cylindrical body and described inner cylindrical body from the outside of this hollow part by described outer cylindrical body and such being disposed in order of described inner cylindrical body, wherein, described inner cylindrical body (112) and described outer cylindrical body (114) are by the Al-Si alloy composition of same type.

7, hollow part according to claim 6 (110), wherein, the average diameter of the primary crystal Si particle in the metal structure is below the 35 μ m.

8, according to claim 6 or 7 described hollow parts (110), wherein, described hollow part (110) is the cylinder jacket in the hole of the cylinder block of waiting to be arranged in internal combustion engine.

9, a kind of method, by making the hollow part (110) of basic tubular, stacked type in the cylindrical die (22) that melt (L2) is fed to rotation, this method comprises the following steps: this method by centrifugal casting

The melt (L2) of Al-Si alloy is introduced in the cylindrical die (22) of rotation, therefore formed outer cylindrical body (114) by centrifugal casting; And

The melt (L2) of Al-Si alloy that will be identical with described melt (L2) type is guided in the described outer cylindrical body (114), rotates described cylindrical die (22) simultaneously, thereby forms inner cylindrical body (112) by centrifugal casting, to prepare stacked prefabricated component.

10, method according to claim 9, wherein, the thickness of described outer cylindrical body (114) is 0.5mm to 2.0mm, and after the temperature of described outer cylindrical body (114) is reduced to below the liquid-solid phase line temperature of phase diagram, introduce the described melt (L2) that is used to form described inner cylindrical body (112).

11, according to claim 9 or 10 described methods, this method also comprises the step of the internal perisporium of the described prefabricated component of planing, and waits to be arranged in the cylinder jacket in the hole of cylinder block of internal combustion engine with manufacturing.

12, the hollow part (210) of a kind of basic tubular, stacked type, this hollow part comprises the inner cylindrical body of casting (212) and outer cylindrical organizator (214), the described inner cylindrical body of casting and described outer cylindrical organizator from the inboard of this hollow part by the described inner cylindrical body of casting and such being disposed in order of described outer cylindrical organizator, wherein, the described inner cylindrical body of casting (212) comprises aluminum or aluminum alloy, and described outer cylindrical organizator (214) is by the Al-Si alloy composition.

13, hollow part according to claim 12 (210), wherein, the average diameter of the primary crystal Si particle in the metal structure of the described inner cylindrical body of casting (212) is below the 35 μ m.

14, according to claim 12 or 13 described hollow parts (210), wherein, described hollow part (210) is the cylinder jacket in the hole of the cylinder block of waiting to be arranged in internal combustion engine.

15, a kind of method, this method is used to make the hollow part (210) of basic tubular, stacked type, this hollow part comprises the inner cylindrical body of casting (212) and outer cylindrical organizator (214), by the described inner cylindrical body of casting and such being disposed in order of described outer cylindrical organizator, this method comprises the following steps: from the inboard of this hollow part for the described inner cylindrical body of casting and described outer cylindrical organizator

The cylindrical shell that will be used to form the aluminum or aluminum alloy of described outer cylindrical organizator (214) inserts in the cylindrical die (22) of centrifugal casting machine; And

The melt (L3) of Al-Si alloy is introduced in the described cylindrical die (22) of rotation, therefore formed the described inner cylindrical body of casting (212), to prepare stacked prefabricated component by centrifugal casting.

16, method according to claim 15, wherein, the thickness that is used to form the described cylindrical shell of described outer cylindrical organizator (214) is 1.0mm to 2.0mm.

17, according to claim 15 or 16 described methods, this method also comprises the step of the internal perisporium of the described prefabricated component of planing, and waits to be arranged in the cylinder jacket in the hole of cylinder block of internal combustion engine with manufacturing.

18, the cylinder jacket in a kind of hole of the cylinder block of waiting to be arranged in internal combustion engine, this cylinder jacket comprises outer cylindrical body (314) and inner cylindrical body (312), described outer cylindrical body and described inner cylindrical body from the outside of this cylinder jacket by described outer cylindrical body and such being disposed in order of described inner cylindrical body, wherein, described inner cylindrical body (312) and described outer cylindrical body (314) are by dissimilar Al-Si alloy compositions.

19, cylinder jacket according to claim 18, wherein, the Al-Si alloy of the described outer cylindrical body of described Al-Si alloy ratio (314) of described inner cylindrical body (312) is more wear-resisting.

20, according to claim 18 or 19 described cylinder jacket, wherein, the linear expansion coefficient difference between the described Al-Si alloy of described outer cylindrical body (314) and the material of described cylinder block is below 3 * 10-6/ ℃.

21,, wherein, on the periphery wall of described outer cylindrical body (314), form concaveconvex shape according to each described cylinder jacket in the claim 18 to 20.

22, a kind of method, this method are used for making the cylinder jacket in the hole of the cylinder block of waiting to be arranged in internal combustion engine, and this method comprises the following steps:

First melt (L4) of Al-Si alloy is introduced in the cylindrical die (22) of rotation, therefore formed outer cylindrical body (314) by centrifugal casting;

Second melt (L5) of the Al-Si alloy of another type is introduced in the described outer cylindrical body (314), rotated described cylindrical die (22) simultaneously, therefore form inner cylindrical body (312), to prepare stacked prefabricated component (310) by centrifugal casting; And

The plane internal perisporium of described prefabricated component (310).

23, method according to claim 22, wherein, the Al-Si alloy of described first melt of described Al-Si alloy ratio (L4) of described second melt (L5) is more wear-resisting.

24, according to claim 22 or 23 described methods, wherein, to be chosen as the linear expansion coefficient difference that makes between the material of the described cylinder jacket that formed by described first melt (L4) and described cylinder block be below 3 * 10-6/ ℃ to the material that is used for described first melt (L4).

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