JPH1099961A - High adhesibility inserting member and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an Al alloy base inserting member improving the adhesiveness and having light wt. and excellent wear resistance and heat conductivity by making a specific % of an area ratio of Al oxide in an observing field on the interface between a material to be inserted and the base material Al alloy as the inserting material. SOLUTION: The base material is poured from a melting furnace through an outside pouring hole 10 and a wear resistant ring 3 is pushed to the base material by applying the load of 500kgf/cm<2> with a hydraulic cylinder 6 for pressurizing to execute the pressure-welding. On the interface between the material to be inserted and the base material Al alloy as the inserting material, the Al oxide is made to 10-40% of the area ratio in the observing field with an optical microscope or a scanning type electronic microscope. By this method, the adhesiveness between the material to be inserted and the matrix is improved and the Al alloy base inserting member having light wt. and excellent wear resistance and heat conductivity, is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-adhesion cast-in insert member and a method of manufacturing the same, and more particularly, to a high-adhesion insert insert having improved adhesion between a cast-in preform and a cast-in insert material by pressure bonding. The present invention relates to a member and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, in a piston made of a light alloy used for a high-speed diesel engine or a high-output gasoline engine such as an internal combustion engine, especially for automobiles, the piston ring groove, especially the top ring groove, has been severely worn. For this reason, measures have been taken such as casting a cast iron wear ring in the top ring groove or partially reinforcing the top ring groove by FRM using Al ₂ O ₃ short fibers or the like. In addition, partially reinforced automobile parts such as an aluminum alloy oil pump casing and a differential case have been used in trial production research.

[0003] However, in the case of a piston made of a light alloy which is formed by casting a wear ring made of cast iron, a piston having excellent wear resistance and thermal conductivity can be obtained at a relatively low cost.
Since the heat conductivity of cast iron wear rings is inferior to that of alloys, there is a shortage of the function of cooling the piston itself, receiving the heat energy generated in the combustion chamber and escaping the heat of the piston through the top ring to the cylinder wall. As a result, the piston temperature tends to be excessively high. Therefore, there is a problem that such a piston cannot be used because it causes detonation in a gasoline engine even though it is good for a diesel engine as a compression ignition engine. .

[0004] Light alloy pistons made of cast iron bearing rings have been inevitably increased in inertial mass, and thus have been difficult to use as pistons for high-speed gasoline engines.

Therefore, for example, as described in Japanese Patent Application Laid-Open Nos. 56-1258 and 61-293650, an as-cast stuffed material is made of an Al alloy-based FRM (Fiber Re
Informed Metals)
Means for achieving both lightweight and abrasion resistance and thermal conductivity have been considered.

However, when an Al alloy-based FRM is cast in a molten Al alloy, an Al oxide layer remains at the interface between the cast material and the molten Al alloy, and the Al oxide layer remains between the molten metal (base material) and the cast material. In many cases, strong adhesion was not obtained, and there was a tendency that the strength of the product piston could not be guaranteed as a performance.

As a countermeasure for this, Japanese Patent Laid-Open No. 4-520
No. 65 discloses that the FRM surface is plated with a metal such as Ni or Cu, and is subjected to high-pressure casting to improve the wettability with the molten Al alloy and to improve the adhesion between the cast material and the base material. Is disclosed.

[0008] However, the plating process is complicated, requires special facilities and techniques, causes problems such as wastewater treatment in terms of environmental measures, and is not easy in terms of cost.

[0009] The plating layer of a low melting point metal such as Sn or Zn becomes an oxide or a molten oxide during preheating of the work (about 200 to 500 ° C), and rather inhibits the adhesion to the Al-based molten metal. There were also problems. In addition, high-pressure casting has high equipment and maintenance costs, and has a problem in safety.

The inventors of the present invention have studied other means and repeated experiments. As a result, the gravity-casting process is performed to press-bond the stuffed material and the base metal Al alloy in a solid-liquid coexisting temperature range to obtain an interface. It was found that a high-adhesion cast-in material without metal oxide could be obtained, and the present invention was reached.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an Al alloy-based cast-in member which improves the adhesion between the material to be cast and the matrix, is lightweight, has excellent wear resistance and thermal conductivity, and a method for producing the same. is there.

Another object of the present invention is to provide a low-cost and lightweight Al-alloy-based high-adhesion stuffed member which has a higher product yield than conventional light-alloy-based stuffed members and a method of manufacturing the same. .

[0013]

According to the present invention, at the interface between the to-be-stuffed material and the base material Al alloy as the to-be-stuffed material, the area ratio in the visual field observed by an optical microscope or a scanning electron microscope is A.
(1) A high-adhesion cast-in member (claim 1) characterized in that only 10 to 40% of oxides are found, and a wear-resistant material (trigger) forming a piston ring groove. The method according to claim 1, which is a piston for an engine, wherein the high-adhesion insert-molded member according to claim 1 and the cast insert-molded member are cast with a base material Al alloy in a solid-liquid coexisting temperature range. A method for manufacturing a high-adhesion cast-in-place member, which comprises joining a cast-in-place material to a base material Al alloy under pressure (claim 3); ~2,000Kgf / cm ^2, preferably highly adhesive insert casting member manufacturing method according to claim 3 which is 500~1,000kgf / cm ² (claim 4), and sprue with split outer die pair Close contact with upper and middle mold and upper mold pressing mechanism The base material Al perpendicularly to the casting-material
5. The method for producing a high-adhesion stuffed member according to claim 4, which is performed by using a pressure casting apparatus that presses the alloy. 6. The method according to claim 3, wherein the interface between the aluminum alloy and the base material is cleaned and the interface between the cast aluminum alloy and the base metal alloy is closely bonded in the second stage. A law (claim 6) is provided.

Hereinafter, the present invention will be described in detail. Solid-liquid coexistence temperature In the present invention, the solid-liquid coexistence region does not necessarily mean the temperature and component range on an ideal phase diagram, but refers to an inner region outside a boundary region. Therefore, the solid-liquid coexistence temperature is not a critical boundary temperature of a fixed component but a temperature at which a solid-liquid coexistence state is stably maintained.

[0015] For example, in the case of A390 alloy, when the surface temperature of the insert casting material during pouring and _{T S,} 550 ° C. ≦
If T _S ≦ 580 ° C., it is possible to avoid the “dissolved and mixed state” between the base metal Al alloy and the to-be-stuffed material as described later while guaranteeing the bonding strength. That is, it is possible to achieve both bonding strength and wear resistance. T _S is not in the piston becomes defective joint and does not reach 550 ° C. practical and T _S is 58
If the temperature exceeds 0 ° C., a “melt-mixed state” occurs and wear resistance is impaired. As will be apparent from examples described later, in the stuffing process, the stuffed material to be cast, the base metal Al alloy, the initial temperature of the mold, the design shape of the feeder, and the like affect the product characteristics.

According to the present invention, the bonding adhesion at the solid-liquid coexistence temperature at the interface between the base material Al alloy and the as-cast to-be-filled material is significantly improved in the pressurized state, and the reaction between the two is promoted and the bonding is performed firmly. Very important. Al alloy [A] Al alloy [A] is a base metal Al alloy and is JISAC8
A-Si-Cu-Mg alloys such as A, AC8B, AC8C, etc., which have been conventionally used as piston materials. As an example, the alloy component of AC8A (wt
%) Are shown in Table 1.

[0017]

[Table 1] Also, JISAC8B and AC8C have lower Ni components by 0.5 to 1.0 wt% than AC8A, respectively, and are lower cost materials. The Al alloy [A] has a low coefficient of thermal expansion and excellent high-temperature strength, and is suitable for a piston base material. "The casting-material" in the insert casting material present invention, (1) Al alloy [B] alone, (2) Al alloy [B] + Al alloy [C]
(Mixture or alloy), (3) A composite member formed by casting an Al alloy [D] described below using any one of (1), (2) and (3) of the Al alloy [C] alone as a matrix. is there. The base Al alloy which is the cast-in material according to claims 1 to 3 is an Al alloy [A], and the cast-to-be-formed material is the above-mentioned "cast-filled material". Al alloy [B] The Al alloy [B] corresponds to, for example, JISAC9B. The Al alloy [B] has a high Si component and has high wear resistance due to precipitation of primary crystal silicon. Table 9 shows AC9B as an example.
Shows the synthesized components of

[0018]

[Table 2] As the Al alloy [B], in addition to JISAC9B, an alloy having a component generally called A390 and shown in the following Table 3 is used.

[0019]

[Table 3] Al alloy [C] Al alloy [C] is a rapidly solidified Al powder alloy and has, for example, alloy components as shown in Table 4 below.

[0020]

[Table 4] The characteristics of the Al alloy [C] are that it has excellent high-temperature strength and wear resistance. Al alloy [D] Al alloy [D] is an Al alloy (the Al alloy [A, B,
C]. ) As a matrix, and the reinforcing material is a composite material comprising metal or ceramic fibers and / or powder. This property is also excellent in high-temperature strength and wear resistance. The metal fiber or metal powder as the reinforcing material is, for example, a ferritic or austenitic stainless steel.

The ceramic is alumina (Al)
₂ O ₃ ), potassium titanate, potassium borate and the like.

The Al alloys [B], [C], and [D] are not made of the same material at the same time. The ratio of the interfacial area of the Al oxide film to the Al oxide is shown in FIG.
When the details are observed, the white part is the Al alloy part [M], and the part [MO] that looks like a dry mud is an oxide film, so by comparing FIGS. 12, 13, 14 with FIGS. It can be seen that if the area ratio [MO] exceeds 40%, the adhesion becomes poor. However, on the other hand, [MO] is 10
% Is practically impossible, so the present invention was determined to be [MO]: 10 to 40%.

[0023]

According to the present invention, when a molten metal is poured into a mold,
Since the adhesion between the as-stuffed material to be reinforced and the Al alloy base material in a very short time when the molten metal (Al alloy base material) is rapidly solidified is greatly improved as compared with the conventional manufacturing method, the joining is performed. Strength is significantly improved. More specifically, when an Al-based alloy member is cast with an Al-based alloy base material, an obstacle is the interposition of a third-party substance such as an oxide film, a contaminant, or a gas between the two. In particular, when the product thickness is thin, such as a piston, the cooling rate of the poured Al-based molten metal is very fast, and when it comes into contact with cast-in-place material, the viscosity increases as the temperature decreases and the surface tension increases. It is getting bigger. In conventional mere gravity casting, under such conditions, the wettability or adhesion of the surface of the to-be-cast material is not always good, and the Al-based alloy base material may not be able to contact the to-be-cast material in small irregularities, and in that part, Since the third party material between the two cannot be washed away, there is a tendency that the systematic joining of the two becomes difficult. Therefore, the present inventors have conducted extensive experiments and
As a result of the study, the pressure applied to the base metal Al alloy in the solid-liquid coexistence temperature range of the to-be-stuffed material was 200 to 2,000 kgf / cm.
^{2. It} has been found that the adhesion is remarkably improved by setting it to preferably 500 to 1,000 kgf / cm ² .

The reason for this limitation is as follows. That is, if the pressure is not at least 200 kgf / cm ^2, the interface cleaning effect of the present invention will not be obtained, and if it exceeds 2,000 kgf / cm ² , the facility will be unreasonable and the cost will increase. More desirably pressure is because more reliable adhesion is obtained when is 500 kgf / cm ² or more, and is 1,000 kgf / cm further advantageous in equipment cost and safety be ^two or less.

The mechanism for improving the adhesiveness is as follows. The material to be cast is pressed against a base material Al alloy having a solid-liquid coexistence temperature.
First, as the molten metal moves parallel to the surface of the material to be cast, the oxide film on the surface of the wear-resistant ring is peeled off as strips, and the interface is cleaned (first stage). Then, cooling proceeds and the fluidity is slightly poor. According to the Pascal principle, just like a balloon in water, the interface between the Al alloy of the base metal alloy in the form of viscoplastic fluid and the stuffed material (solid) is pressed in the direction perpendicular to each other at the minute interface, and adheres. (Second stage). Therefore, it is considered that the wear ring and the base material Al alloy are joined significantly stronger than before.

Hereinafter, this operation will be described in detail.

FIG. 4 is a cross-sectional view of the pressurizing section taken along the center axis of the piston before pressurizing, FIG. 5 is a cross-sectional view of the pressurizing section of the first pressurizing stage, and FIG. It is sectional drawing of a pressurization part.

As will be described later with reference to FIGS. 4 to 6, reference numeral 1 denotes a piston casting outer die, 1A denotes an outer die inner edge annular overhang, and 3 denotes Al.
Wear-resistant ring, 3A is the outer edge of the bottom of the aluminum wear-resistant ring, 4 is a wear-resistant pressurizing jig that also serves as a piston casting upper mold, 20 is a base material molten Al alloy (AC8A), 30 is an Al oxide film, and 31 is the exfoliated Al. Oxide film fragments.

[0029] When the pressure P ₁ toward 5 from 4 is applied from the ring carrier pressurizing tool, the ring carrier by parallel thermal friction at the interface between the base metal molten aluminum alloy (melt) 20 as shown in FIG. 5 The Al oxide film 30 on the surface peels off together with other contaminants, and as shown in FIGS.
Are dispersed and the interface is cleaned. Since this thermal friction is intense in the lower part (partially upper part) and the inner surface of the ring, the joining interface 23 between the ring 3 and the molten metal 20 is particularly cleaned so that both metal element surfaces come into direct contact (first stage). .

Then, the pressurizing stroke proceeds, and in FIG. 6, the outer peripheral portion 3A of the wear-resistant ring bottom descends and comes into contact with the outer peripheral portion (stopper) 1A. Further strong pressure P ₂ is applied when the ring carrier 3 causes a slight plastic deformation, the base material 2 began to solidify
0 by Pascal's principle (2nd
stage).

[0031]

According to the present invention, all of the above objects can be attained. In other words, the relatively simple operation of pressurizing the molten metal (cast material) and the wear-resistant ring (cast material) in the contact cooling process thereof removes the Al oxide and other contaminants conventionally existing at the interface between them. By removing them, these can be eliminated, and the adhesion strength between them can be significantly improved.

[0032]

【Example】

[Manufacturing process] An embodiment in which an aluminum alloy wear ring is inserted into a piston for a diesel engine will be described. (1) Evaluation of Direct Press-In Insertion Conditions and Structure Evaluation of Bonding Interface of Aluminum Alloy Wear Ring FIG. 1 is a cross-sectional view of a casting mold and a pressing device.

In FIG. 1, reference numeral 1 denotes a piston casting outer mold which forms an outer shape of a piston. Reference numeral 2 denotes a piston casting middle mold which forms the inner shape of the piston. Reference numeral 3 denotes an aluminum wear ring which is fixed to a wear ring pressing jig. Reference numeral 4 denotes a ring-resistant pressurizing jig which also serves as a piston casting upper die. Reference numeral 5 denotes a hydraulic cylinder fixing jig which is fixed to an outer mold of the casting machine during casting. Reference numeral 6 denotes a pressurizing hydraulic cylinder fixed to a cylinder fixing jig. 6A is a piston rod. Reference numeral 7 denotes a hydraulic pressure generation device and a hydraulic pressure control device for supplying hydraulic pressure to a hydraulic cylinder at a required timing. Reference numeral 8 denotes an upper die moving device which moves the upper die up and down as needed by a hydraulic cylinder. Reference numeral 9 denotes an aluminum melting furnace for melting the AC8A material 20 as a piston base material. FIG. 2 is a process chart showing a casting operation procedure.

In FIG. 2, the piston base material AC8A is
After melting at 80 to 800 ° C., a molten metal treatment for removing nonmetallic inclusions and gas is performed by using a flux (such as chloride or fluoride), and a degassing (H ₂ ) treatment is sequentially performed by bubbling argon gas.

After setting the casting mold and the pressurizing device as shown in FIG. 1, throwing away with AC8A material is performed 3 to 5 times, and the outer mold temperature is set to 250 to 300 ° C.

When the temperature of the mold reaches a predetermined temperature, an aluminum alloy wear ring which has been preheated to about 100 ° C. to remove moisture is attached to the wear ring pressure jig. The upper die is moved downward by the upper die moving device so that the wear ring comes to a predetermined position. After fixing the cylinder fixing jig to the outside, the base material AC8
Material A is poured from the melting furnace through the outer pouring port 10 with a ladle. Fifteen seconds after pouring, a load of 500 kgf / cm ² was applied per unit area of pressurization of the wear ring using a pressurized hydraulic cylinder to apply
A wear ring is pressed against the C8A material, and pressure welding is performed. The pressure contact time is 30 seconds, and then the solidification time is 60 seconds. The middle mold is lowered, the upper mold is raised, the outside is opened, and the piston material 20 is taken out.

In order to evaluate the jointability, as shown in FIG. 3, after cutting off the sprue and the headstock of the piston material, the outer periphery of the piston head 25 is turned by a lathe to come out of the joint 23 of the aluminum wear ring. Cutting is performed until the bonding interface is evaluated by color check (crack coloring inspection).

For more detailed evaluation, such as observation of the structure of the joint interface, as shown in FIG. 3, the piston was cut in the longitudinal direction to cut out the test piece 26 around the wear-resistant ring, and the wear-resistant ring joint was polished. Thereafter, observation and evaluation are performed using a metal microscope, a scanning electron microscope, or the like.

Table 5 shows the results of observation of the bonding interface in a casting test performed by changing the pressure conditions, temperature conditions, surface treatment conditions, and the like during casting.

[0040]

[Table 5] The pressing condition is indicated by a value obtained by dividing the pressing load by the area of the pressing surface of the pressing jig in contact with the wear ring (kgf / cm ² ).

As the temperature conditions, a maximum thermocouple after the pouring of the piston base material is described with a thermocouple attached to the lower part of the ring. The temperature was adjusted according to the preheating temperature of the mold, the preheating temperature of the wear ring, and the like.

As the surface treatment, potassium acid fluoride 5
A chemical conversion treatment with a 10% aqueous solution of zinc chloride and a chemical conversion treatment with a 10% aqueous solution of zinc chloride were performed. There was no difference in the bondability between the two chemical conversion treatments.

(100) in the state of x (comparative example) of the evaluation result
FIG. 7 shows a magnification of the optical microscope.

In this case, the evaluation result is “no practicality”.

In this case, as shown in FIG. 7, there is a crack between the wear-resistant ring and the base material AC8A, so that they are not joined at all.

(100) of the state (comparative example) of the evaluation result Δ
FIG. 8 shows a magnification of the optical micrograph.

In this case, there is no crack between the ring and the AC8A material, but it is hard to say that the Al oxide film is partially present and joined. Similarly, the evaluation result is “no practicality”.

(100) of the state of the evaluation result (circle) (Example)
FIG. 9 shows a magnification of the optical micrograph.

In this case, although there are some fine defects, they are almost joined. The evaluation result is “practical”.

Next, FIG. 10 shows (100 times optical micrograph) the state of the evaluation result (◎) (Example).

The wear ring and the AC8A material are completely bonded, and there is no oxide film at the bonding interface. The evaluation result is “practical enough”.

Further, (1) in the state of □ (comparative example) in the evaluation results
FIG. 11 shows a (00-fold optical microscope photograph).

In this case, the deformation was rather large because the wear ring was pressurized in a state of being excessively softened, but the joining was ◎ (FIG. 1).
Complete as in 0). However, there is a tendency that the density of the primary crystal silicon decreases, and the wear resistance may decrease.

Next, the morphological details of the evaluation of the textures of the evaluations Δ and ◎ will be further described.

As shown in FIG. 8, the bonding interface of the sample evaluated as △ includes a portion that appears to be bonded and a portion that is not visible in an aluminum structure having a continuous interface. Then, the peeled surfaces were each 1 by SEM.
The results of observation at magnifications of 00, 1,000 and 10,000 are shown in FIG. 12, FIG. 13 and FIG.

FIG. 15 and FIG. 16 show that the samples of the evaluation results の are respectively 100
It is a SEM micrograph at × 1000 and × 1000.

FIGS. 17 and 18 show A of the piston base material.
It is the SEM micrograph of 100 times and 1000 times of the fracture surface which fractured C8A material, respectively.

Here, the 100-times SEM image (FIG. 12) of the sample (1) is characterized by the fact that there is a fractured structure of aluminum and a portion which is not blackened and is not blackened. When this part is magnified 10,000 times, as shown in FIG. 14, a part that looks like dried sludge having a crack and a part that looks like something is oozing from inside the crack are visible.

First, in the portion which looks like dried sludge, Al and O were detected and Si was not detected as a result of surface analysis. Therefore, this portion is considered to be an Al oxide film. Further, those which seemed to ooze out of the cracks showed Al and Si as a result of surface analysis, and O was not detected.

The sample forcibly peeled off (see FIGS. 14 and 1)
5) is almost the same as the fracture surface of AC8A (base material; FIGS. 16 and 17), and no oxide film like the sample of △ is observed.

From the results of the above SEM observation, it was found that, in the sample (1), the aluminum oxide film existing in the initial stage of the cast-in was found to be insufficient due to insufficient softening of the material due to insufficient surface temperature of the to-be-stuffed material or insufficient frictional force due to insufficient pressing force. It is probable that a portion where peeling and removal was insufficient remained, and that portion resulted in poor bonding. The material exuding from the cracks of the aluminum oxide is the cast material itself, and the joining is perfect ◎
In the above sample, the aluminum oxide film was disintegrated due to the appropriate softening of the material and the sufficient frictional force due to the pressing force, and the extruded to-be-filled material was joined to the base material AC8A to obtain a sufficient joining result. it is conceivable that.

Table 6 shows the casting conditions for the cast aluminum alloy.

[0063]

[Table 6] [Product Performance Evaluation] The results of evaluation of the shear strength, thermal fatigue strength, and wear strength of a wear-resistant ring portion using a test piece cut out from the piston under the casting conditions shown in Table 6 will be described.

For the shear strength test, a test piece having the same shape as in FIG. 3 was used. In this test, the test piece is set as shown in FIG. 19, and the wear ring is pressed by a jig by an autograph with a jig, and when the wear ring is sheared from the base material or when the wear ring or the base material is broken. The load is evaluated.

Table 7 shows the test results.

[0066]

[Table 7] As a comparative example of the shear strength, a base material AC8A was processed into a similar shape and tested under the same conditions. As a result, the test piece was fractured at the base material AC8A simultaneously with the shearing at the joint interface, and it was confirmed that the test piece had almost the same strength as the base material. It is considered that the reason why the base material and the test piece were destroyed relatively quickly is that the prototype piston used was not heat-treated after casting.

The shear strength was evaluated using four pistons.
Three test pieces were cut out from each one of the pistons.
As a comparative example, pressurizing condition: 200 kgf / cm ² , temperature condition: 5
A sample without surface treatment at 55 ° C. and having a bonding evaluation of Δ was used.

Using the sample processed into the shape shown in FIG. 3, the wear of the top ring groove was evaluated by a wear tester dedicated to the piston having the structure shown in FIG. The result is shown in FIG.
Table 2 shows the test conditions. According to this result, the strength of the top ring groove is significantly improved compared to AC8A, which is the piston base material, and the FRM cast-in has a wear strength superior to that of niresist cast iron.

In FIG. 19, 50 is a piston, 51 is a piston ring, 52 is an auxiliary jig, 53 is a cylinder holder, 54 is a thermocouple, 56 is a piston rotation drive shaft, 57 is a block heater, and 58 is a lubricating oil supply port. , 60 are hydraulic cylinders.

The thermal fatigue strength test was evaluated using a molded piston product.

The sample was heated from the piston head by a propane gas burner, and evaluated by a thermal fatigue tester in which a heat cycle in which the wear ring was heated to 300 ° C. and cooled with water was repeated. As a comparative material, a piston using a Niresist wear ring was used. Although the temperature of the piston ring groove actually rises only about 250 ° C., a cycle of 300 ° C. to 10 ° C. was performed as an acceleration test.

In the evaluation method, the color of the interface of the ring-resistant ring was checked every 100 cycles, and the number of heat cycles at the time when the interface developed red was obtained. In the embodiment of the present invention, the thermal fatigue strength is significantly improved as compared with the prior art top ring groove reinforced piston made of a niresist cast iron insert.

FIG. 20 shows a graph of the test result.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a casting mold and a pressing device.

FIG. 2 is a process chart showing a casting operation procedure.

FIG. 3 is a cross-sectional view of a joint and a cut specimen.

FIG. 4 is a sectional view showing the operation of the present invention.

FIG. 5 is a sectional view showing the operation of the present invention.

FIG. 6 is a sectional view showing the operation of the present invention.

FIG. 7 is a bonding cross-sectional view of evaluation result × (comparative example) 100 times optical microscope photograph.

FIG. 8 is a bonding cross-sectional view of evaluation result 倍 (comparative example), taken at 100 × optical microscope photograph.

FIG. 9 is a bonding cross-sectional view of the evaluation result ○ (Example), taken with a 100-fold optical microscope photograph.

FIG. 10 is a bonding cross-sectional view of the evaluation result ◎ (Example), taken with a 100 × optical microscope.

FIG. 11 is a cross-sectional view of the evaluation result □ (comparative example), taken with a 100-fold optical microscope.

FIG. 12 shows a peeled surface 100 of a joint portion in evaluation result △ (comparative example)
Magnification SEM micrograph.

FIG. 13 is a view showing evaluation results △ (comparative example), ie, joint-peeled surfaces 1, 0.
00 SEM micrograph.

FIG. 14 shows the results of evaluation results 1 (comparative example),
000 times SEM micrograph.

FIG. 15: Evaluation results ◎ (Example) Bonded surface 100
Magnification SEM micrograph.

FIG. 16 shows the evaluation results ◎ (Example) Bonded separation surfaces 1, 0
00 SEM micrograph.

FIG. 17: 100 times S fracture surface of piston base material AC8A
EM micrograph.

FIG. 18 is a fracture surface of a piston base material AC8A material of 1,000 pieces.
Magnification SEM micrograph.

FIG. 19 is a sectional view of a main part of a ring groove wear test material.

FIG. 20 is a graph showing the results of a thermal fatigue test.

FIG. 21 is a graph showing wear test results.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piston casting outer mold 2 Piston casting middle mold 3 Aluminum wear ring 3A Aluminum wear ring bottom outer edge 4 Wear ring pressurizing jig 5 Hydraulic cylinder fixing jig 6 Hydraulic cylinder for pressurization 6A Piston rod 7 Hydraulic pressure generating device and hydraulic control device 8 Upper die moving device 9 Aluminum melting furnace 20 Base material molten Al alloy 30 Al oxide film 31 Exfoliated Al oxide film fragments 50 Piston 51 Piston ring 52 Auxiliary jig 53 Cylinder holder 54 Thermocouple 56 Piston rotation drive shaft 57 Block heater 58 Lubricating oil supply port 60 Hydraulic cylinder

Claims (6)

[Claims] 1. A material to be cast and a base material Al which is a material to be cast.
At the interface with the alloy, Al oxide has an area ratio of 10 to 10 in the visual field observed by an optical microscope or a scanning electron microscope.
A high-adhesion cast-in member characterized in that only 40% is recognized. 2. The high-adhesion cast-in member according to claim 1, wherein the material to be cast is a wear-resistant ring (trager) forming a piston ring groove, and is used for a piston for a reciprocating engine. 3. A method for producing a cast-in-place material in which a cast-to-be-formed material is cast with a base material Al alloy which is a cast-in material in a solid-liquid coexisting temperature range. A method for producing a high-adhesion cast-in member, characterized in that: 4. The pressing force per unit area of the surface of the surface of the object to be cast is 200 to 2,000 kgf / cm ² , preferably 50.
Preparation of highly adhesive insert casting component according to claim 3 which is 0~1,000kgf / cm ^2. 5. A pressurizing method for pressurizing a to-be-cast material to a base material Al alloy in a direction perpendicular to a contact surface, comprising a pair of split outer molds with a gate and upper and middle molds and an upper mold pressing mechanism. 5. The method for producing a high-adhesion cast-in member according to claim 4, which is performed using a casting apparatus. 6. The first stage of the upper mold pressing stroke cleans the interface between the stuffed material and the base material Al alloy, and closely adheres the stuffed material and the base material Al alloy in the second stage. A method for producing a high-adhesion cast-in member according to any one of claims 3 to 5.