JPH0533723A - Metal-flow connection structure and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a metal-flow connection structure connecting a metallic member and a ceramic member and capable of being applied to, for example, a heatinsulation piston. CONSTITUTION:This metal-flow connection structure is one wherein a ceramic- made mount portion 1 is fitted into a mount hole 3 formed in a metallic wall portion 2; a groove portion 6 of the mount portion 1, large-diameter hole 5 and mount hole 3 define a space portion in which a metallic connection ring 10 is made plastically deformable; and a ceramic-made embedding member 15 is embedded into the connection ring 10. After the connection ring 10 is hardened, it is not necessary to remove from the connection ring 10 the embedding member 15 which is a pusher ring demounted from the press, but a mere removal of the upside located press alone sufficiently serves the purpose. Accordingly, performance of the manufacturing process is very easy, and the connection ring 10 is plastically deformed and is securely fitted into the groove portion 6 of the mount portion 1, thus firmly fixing the mount portion 1 to the wall portion 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal flow connecting structure for connecting a ceramic part and a metal part, which are applied to a heat insulating piston or the like, with a connecting ring, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Heretofore, there has been disclosed a method for manufacturing a metal flow joint structure in which a metal component and a ceramic component are plastically deformed to be coupled to each other by metal deformation. A conventional method of manufacturing a metal flow coupling structure will be described with reference to FIGS. 5, 6 and 7. The metal flow connection structure is an example applied to connect the ceramic piston head 21 and the metal piston skirt 22 in the heat insulating piston. The adiabatic piston is made of aluminum, FC having a mounting hole 3 formed in the center of the upper wall 2 which is a metal part.
A piston skirt 22 made of a metal material such as, and a piston head 21 made of a ceramic material such as silicon nitride or cermet having a mounting portion 1 protruding in the lower center and fitted into the mounting hole 3. The piston skirt 22 that is a component and the piston head 21 that is a ceramic component are fixed by plastic deformation of the metal coupling ring 10. The mounting hole 3 has a large-diameter hole 5 and the large-diameter hole 5
The small-diameter hole 4 communicates with the large-diameter hole 5 and the small-diameter hole 4, and their axes are aligned with each other. The mounting portion 1 has a circumferential groove portion 6 formed on an outer peripheral surface 13 which is a wall surface facing the large diameter hole 5. Further, in order to ensure heat insulation between the mounting portion 1 and the upper-end wall portion 2, the space portion formed by the outer peripheral surface of the mounting portion 1 and the wall surface of the large-diameter hole 5 of the wall portion 2 has a part. Heat insulating members 7 and 8 made of a low heat conductive material made of ceramics such as stabilized zirconia are arranged.

In the above heat insulating piston, a metal flow metal is provided in the space formed by the outer peripheral surface 13 of the mounting portion 1 and the wall surface of the large diameter hole 5 of the wall portion 2 and the circumferential groove portion 6 formed in the mounting portion 1. In order to insert the coupling ring 10 made of (1) by plastic deformation, the coupling ring 10 is heated by the heating means 9 such as a high-frequency induction heating device using a high-frequency coil to raise the temperature, so that the coupling ring 10 is in a plastically deformable state. Then, the coupling ring 10 is pressed by a press 11 such as a push ring to plastically deform the coupling ring 10 and
0 is plastically deformed and fitted into the circumferential groove portion 6 formed in the mounting portion 1, and the mounting portion 1 is fixed to the upper end wall portion 2.

Further, as a structure of the heat insulating piston, there is one disclosed in Japanese Patent Laid-Open No. 63-255551. The structure of the adiabatic piston is such that a ceramic piston crown and a metal piston skirt are joined together in a central portion and an outer peripheral portion in a fitted state, and a heat insulating seal material is interposed between opposed surfaces of the piston crown and the piston skirt, When the piston crown receives pressure, the outer peripheral portion of the piston crown is deformed outward.
The heat insulating seal material is made of a mixed material of potassium titanate and glass fiber. Further, carbon is mixed in the fitted portion of the heat insulating seal material.

A jig for joining metal and ceramics is disclosed in Japanese Utility Model Laid-Open No. 62-93344. The joining jig has a plastic fluid material interposed in the gap between the metal and the ceramic, and a flow groove is formed on at least one side of the metal and the ceramic in the plastic fluid material mounting portion, and the plastic fluid material is heated and pressed. Is deformed to flow in the flow groove to bond the metal and the ceramic. In addition, the joining jig is formed so that the tip of the pressurizing medium is positioned so that the pressing surface that is most loaded with respect to the plastic fluid material is located in the vicinity of the flow groove, and the other surface is a relief surface for the above load. It was formed in.

[0006]

However, a ceramic component such as a piston head is plastically deformed by a metallic ring such as a piston skirt with the heat insulating members 7 and 8 interposed therebetween to plastically deform the metallic ring. In this case, the coupling ring 10 is heated by the heating means 9 such as a high-frequency coil to raise its temperature to make the coupling ring 10 plastically deformable,
Connecting ring 10 by press 11 such as push ring
When is pressed and plastically deformed, as shown in FIG. 6, the tip portion of the press 11 is embedded in the coupling ring 10. At the end of the metal flow, the metal flow metal is cooled and hardened. At that time, the tip of the press 11 is cracked or the tip of the press 11 is broken by the contraction of the metal flow metal, that is, the coupling ring 10. There is a problem that it becomes stuck and cannot come off.

The above-mentioned phenomenon is caused by the above-mentioned actual exploitation 62-9.
The jig for joining metal and ceramics disclosed in Japanese Patent No. 3344 also has a problem that a similar phenomenon occurs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems, and when connecting a ceramic part such as a piston head and a metal part such as a piston skirt, a metal flow metal coupling ring is used. The press for pressing for plastic deformation is made of two-piece pressing parts, and the pressing part positioned on the side that contacts the connecting ring is configured as an embedding member, and the embedding member is inside the connecting ring in a plastically deformable state. Ceramic part that prevents the cracking of the pressed part or the sticking of the pressed part to the connecting ring by inserting the connecting ring into the groove formed in the ceramic part by expanding the outer volume of the connecting ring itself. A metal flow connection structure for connecting a metal part and a metal part and a method for manufacturing the same.

[0009]

In order to achieve the above object, the present invention is configured as follows. That is,
The present invention is formed of a metal component having a mounting hole, a ceramic component having a mounting portion that fits in the mounting hole and has a groove portion on a wall surface, the groove portion, the mounting hole and the mounting portion. The present invention relates to a metal flow coupling structure having a metal coupling ring disposed in a space by plastic deformation and a ceramic embedding member embedded in the coupling ring when the coupling ring is plastically deformed.

In this metal flow coupling structure, the metal part is a piston skirt and the ceramic part is a heat insulating piston which is a piston head.

Alternatively, according to the present invention, a step of manufacturing a metal part having a mounting hole and a ceramic part having a mounting portion having a groove portion on a wall surface, and fitting the mounting portion into the mounting hole. And disposing a coupling ring in a space formed between the outer peripheral surface of the mounting portion and the inner peripheral surface of the mounting hole, and disposing a ceramic embedding member on the coupling ring. And a step of embedding the embedding member in the coupling ring by pressing and plastically deforming the coupling ring to be fitted into the groove of the mounting portion. The present invention relates to a method for manufacturing a flow coupling structure.

[0012]

The metal flow connection structure and the manufacturing method thereof according to the present invention are constructed as described above, and operate as follows. In this metal flow coupling structure, a mounting portion of a ceramic component is fitted into a mounting hole formed in a metal component, and a metal portion is formed in a groove portion of the mounting portion and a space formed by the mounting hole and the mounting portion. The coupling ring is plastically deformable to embed a ceramic embedding member in the coupling ring, and the embedding member is a pusher ring divided from a press, after the coupling ring is hardened, the It is not necessary to remove from the coupling ring, only the press located on the upper side needs to be removed, the manufacturing process is extremely easy, and the coupling ring is securely plastically deformed to firmly fix the mounting portion and the wall portion. it can.

Moreover, since the embedding member is made of ceramics, it does not melt at the time of metal flow and can easily enter the metal flow metal in a plastically deformed state, thereby plastically deforming the coupling ring. Moreover, since it is not necessary to take out the embedding member from the coupling ring,
Since the press does not directly enter the coupling ring, the tip of the press is not cracked or damaged by the shrinkage force of the metal, and the press does not stick to the coupling ring. Can be easily separated from the coupling ring.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a metal flow coupling structure according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view for explaining an embodiment of a manufacturing process for achieving a method for manufacturing a metal flow joint structure according to the present invention, FIG. 2 is a partially enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is according to the present invention. FIG. 4 is a cross-sectional view illustrating an example of a subsequent manufacturing process for achieving the manufacturing method of the metal flow coupling structure, and FIG. 4 is a partially enlarged cross-sectional view of a main part of FIG. 1, 2, 3 and 4
Regarding the reference numerals assigned to the parts shown in FIG. 5, the same parts as the parts shown in FIGS. 5, 6 and 7 are given the same reference numerals.

The method for manufacturing the metal flow joint structure according to the present invention can be widely applied to the case where metal parts and ceramic parts are joined by metal flow metal. In this embodiment, the metal according to the present invention is used. 1 shows an example in which a flow coupling structure and its manufacturing method are applied to couple a piston head and a piston skirt that reciprocate in a cylinder. That is, the mounting portion 1 which is a ceramic part provided in the center of the piston head and protruding downward.
Is fitted and fixed in a mounting hole 3 formed in the wall portion 2 which is a metal part of the piston skirt. The mounting portion 1 provided on the piston head is made of silicon nitride, silicon carbide,
It is made of ceramic material such as cermet or composite material. Also, the wall portion 2 provided on the piston skirt is
It is made of metal materials such as aluminum alloy and FC.

The piston head has an outer peripheral ring portion extending downward from the periphery of the crown portion having the combustion chamber and a mounting portion 1 extending downward from the vicinity of the center of the crown portion.
The piston skirt has a wall 2 with a mounting hole 3 formed in the center.
have. Further, on the outer peripheral surface of the mounting portion 1 of the piston head, there is formed a circumferential groove portion 6 which is recessed slightly inward in the radial direction for fitting the metal flow metal, that is, the coupling ring 10. The piston head and the piston skirt are fixed by a coupling ring 10 which is fitted into the circumferential groove portion 6 by plastic deformation of the metal flow metal with heat insulating members 7 and 8 made of ceramics interposed.

Further, in this metal flow coupling structure, a heat insulation made of ceramics such as partially stabilized zirconia is provided between the large diameter hole 5 of the wall part 2 of the metal part and the outer peripheral surface 13 of the mounting part 1 of the ceramic part. In addition to interposing the member 8, a heat insulating member 7 made of ceramics such as partially stabilized zirconia is interposed between the large diameter hole 5 of the wall portion 2 and the outer peripheral surface 16 of the metal coupling ring 10. It is possible to greatly improve the heat insulating property between the mounting portion 1 of the ceramic component and the wall portion 2 of the metal component. In some cases, in the heat insulating piston, an annular gap 12 is formed between the small diameter hole 4 of the mounting hole 3 of the piston skirt and the outer peripheral surface 13 of the mounting portion 1 of the piston head.
By forming (see FIG. 2 or FIG. 4), an air gap due to the annular gap 12 is present, so that the heat insulation between the piston head of the ceramic part and the piston skirt of the metal part is significantly improved. be able to. Alternatively, although not shown, an annular gap 12 between the small diameter hole 4 formed in the wall portion 2 and the outer peripheral surface 13 of the mounting portion 1
Alternatively, a heat insulating sheet such as aluminum titanate can be interposed, and similarly the heat insulating property between the two can be improved.

In this metal flow connection structure, the mounting portion 1 and the wall portion 2 can be connected or fixed as follows. The mounting portion 1 is fitted in a state where a space is formed between the mounting portion 1 and the large diameter hole 5 of the mounting hole 3 formed in the wall portion 2, and the mounting portion 1 and the wall portion 2 are mounted on a base (not shown). Set. On the radial step surface 17 formed between the large diameter hole 5 and the small diameter hole 4 of the mounting hole 3 formed in the wall portion 2, that is, the outer peripheral surface 1 of the mounting portion 1.
The heat insulating member 8 is placed between the wall surface of the large diameter hole 5 and the wall surface of the large diameter hole 5, and the heat insulating member 7 is placed in contact with the wall surface of the large diameter hole 5 of the mounting hole 3. Further, as shown in FIG. 1 and FIG.
A coupling ring 10 made of a metal flow metal material is fitted in a space formed by the outer peripheral surface 13 of the and the heat insulating members 7, 8 and further embedded on the coupling ring 10 made of ceramics such as silicon nitride. The member 15 is arranged (see FIG. 1). After setting the heat insulating members 7 and 8, the coupling ring 10 and the embedding member 15 with respect to the mounting portion 1 and the wall portion 2,
As shown in FIGS. 1 and 2, a press 11 for pressing the embedding member 15 is set, and high-frequency induction heating which is a heating means such as a high-frequency coil for heating the coupling ring 10 to a plastically deformable state. Set up device 9.

In this state, the high frequency induction heating device 9 is energized, and the metal flow metal, that is, the coupling ring 10 is heated by the high frequency induction heating device 9 to raise the temperature, and the coupling ring 1
0 is softened to a plastically deformable state. Coupling ring 10
When it is softened to be in a plastically deformable state, the press 11 is operated and lowered, the embedding member 15 is pushed down by the press 11, and the embedding member 15 is joined as shown in FIGS. 3 and 4. It is embedded in the ring 10. At this time, it is needless to say that if the tip of the embedding member 15 is formed into a pointed shape by a tapered surface or the like, the embedding member 15 can be satisfactorily penetrated into the coupling ring 10.

Therefore, the embedding member 15 is inserted into the coupling ring 10.
As the joint ring 10 invades, the joint ring 10 plastically deforms to expand the outer volume, in other words, the joint ring 10 expands by the volume occupied by the embedding member 15, and the portion of the joint ring 10 expanded by the plastic deformation expands. 1 circumferential groove 6
It intrudes into the inside and is fitted as the protruding portion 14. Then
The energization of the high frequency induction heating device 9 is stopped and the press 11 is raised. The softened coupling ring 10 cools and hardens. Therefore, the cured coupling ring 10 has a protrusion 14
Serves as a locking piece, and the mounting portion 1 is fixed to the wall portion 2.

[0021]

Since the metal flow coupling structure and the manufacturing method thereof according to the present invention are configured as described above, they have the following effects. This metal flow coupling structure includes a metal part having a mounting hole, a ceramic part having a mounting part that fits in the mounting hole and has a groove formed on a wall surface, the groove part, the mounting hole and the mounting part. Since the metal coupling ring disposed by plastic deformation in the formed space portion and the ceramic embedding member embedded in the coupling ring when the coupling ring is plastically deformed, the embedding member is good in the coupling ring. In such a state that the embedded member is maintained in a state of being embedded, the protrusion that protrudes inward in the radial direction and that has entered the groove due to the plastic deformation of the coupling ring by the embedded member firmly locks the attachment portion.

When this metal flow connection structure is applied to a heat insulating piston, the piston head and the piston skirt can be firmly connected, and a good heat insulating piston can be provided. In that case, in the adiabatic piston, the metallic part is the piston skirt and the ceramic part is the piston head.

Further, according to the method of manufacturing the metal flow coupling structure, the mounting portion is fitted in the mounting hole and the space portion formed between the outer peripheral surface of the mounting portion and the inner peripheral surface of the mounting hole is inserted into the space portion. A coupling ring and a ceramic embedding member on the coupling ring. The coupling ring is heated to make it plastically deformable, and the embedding member is embedded in the coupling ring by pressing and Since the coupling ring is plastically deformed and fitted into the groove portion of the attachment portion, the press is not directly pushed into the coupling ring, and is located on the side in contact with the coupling ring divided from the press. The embedding member is embedded and embedded in the coupling ring in a plastically deformable state, and the outer shape volume of the coupling ring itself is expanded, that is, the coupling ring is formed in the mounting portion by plastic deformation. Serial is fitted in the groove to form a locking portion to form a protrusion.

Therefore, since the tip of the press does not pierce the coupling ring, the press can be immediately separated from the coupling ring, and the tip of the press does not crack, or the press of the press does not occur. The tip portion does not stick to the coupling ring and cannot be removed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a manufacturing process for explaining an embodiment of a metal flow coupling structure and a manufacturing method thereof according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a main part of FIG.

FIG. 3 is a cross-sectional view showing successive manufacturing steps for explaining an embodiment of the metal flow coupling structure and the manufacturing method thereof according to the present invention.

FIG. 4 is a partially enlarged cross-sectional view showing a main part of FIG.

FIG. 5 is a cross-sectional view for explaining a manufacturing process of an example of a conventional method for manufacturing a metal flow coupling structure.

FIG. 6 is a cross-sectional view for explaining a step that follows the manufacturing step shown in FIG.

FIG. 7 is a sectional view showing an adiabatic piston to which a metal flow coupling structure can be applied.

[Explanation of symbols]

1 Mounting part (ceramic parts) 2 walls (metal parts) 3 mounting holes 4 small hole 5 large hole 6 circumferential groove 7 Insulation member 8 Thermal insulation member 9 High frequency induction heating device (heating means) 10 coupling ring 11 Press 14 Projection 15 Embedded member

Claims (3)

[Claims] 1. A metal component having a mounting hole, a ceramic component having a mounting portion that fits into the mounting hole and has a groove portion formed on a wall surface, the groove portion, the mounting hole and the mounting portion. A metal flow coupling structure, comprising: a metal coupling ring disposed in a space portion by plastic deformation; and a ceramic embedding member embedded in the coupling ring when the coupling ring is plastically deformed. 2. The metal flow joint structure according to claim 1, wherein the metal part is a piston skirt and the ceramic part is a heat insulating piston which is a piston head. 3. A step of manufacturing a metal part having a mounting hole and a ceramic part having a mounting portion having a groove formed on a wall surface, the mounting portion being fitted into the mounting hole. Arranging a coupling ring in a space formed between the outer peripheral surface of the coupling part and the inner peripheral surface of the mounting hole, and arranging a ceramic embedding member on the coupling ring, heating the coupling ring To make it plastically deformable, and embedding the embedding member in the coupling ring by pressing and plastically deforming the coupling ring to fit it into the groove of the attachment portion. Method for manufacturing metal flow coupling structure.