JP7105366B2 - CASTING PRODUCTS, STRUCTURES AND METHOD OF MAKING CASTING PRODUCTS - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cast product, a structure, and a method of manufacturing a cast product in which a joining tip is cast in a cast metal material.

Conventionally, for example, when joining a non-ferrous metal member such as aluminum, magnesium, zinc, etc., to a ferrous metal (steel) member, if the two members are directly joined by welding, etc., they are dissimilar metals. , a brittle intermetallic compound is generated at the joint interface. As a result, it is known that the bonding strength varies greatly and the reliability of the bonding becomes low.

Therefore, by encasing part of the ferrous metal joining tip with a non-ferrous metal casting metal material, a cast product that integrates the casting metal material and the joining tip is manufactured. There is a technique for joining a cast metal material and a mating member (Patent Document 1).

Japanese Patent No. 6322453

However, in contrast to the above-described conventional technology, it is desired that burrs due to the cast metal material are less likely to occur on the joint surface when the cast metal material is cast.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cast product, a structure, and a method for manufacturing a cast product, which can make it difficult for burrs due to cast metal materials to occur on the joining surfaces.

In order to achieve this object, the cast product of the present invention comprises a joining tip having a joining surface made of ferrous metal and a restricting surface facing in an axial direction along one imaginary axis orthogonal to the joining surface; a cast metal material made of a non-ferrous metal in which the joining tip is cast so as to be in contact with the regulating surface, wherein the joining tip has a head portion whose surface is the joining surface; a leg protruding from the back surface of the cast metal material, the leg having a tip portion remote from the back surface, and the cast metal material having the bonding tip exposed with the bonding surface and the tip portion exposed. A cast-in cast portion is provided, wherein the axial stiffness of the leg portion is less than the axial stiffness of the head portion.

Further, a method for manufacturing a cast product according to the present invention includes a joining tip having a joining surface made of iron-based metal and a restricting surface facing in an axial direction along one imaginary axis perpendicular to the joining surface, and the restricting surface. and a cast metal material made of non-ferrous metal in which the joint tip is encapsulated so as to be in contact with the first mold and the second mold, wherein the joint surface is in contact between the first mold and the second mold. a deformation step of compressively deforming the bonding tip in the axial direction by bringing the first mold and the second mold closer to each other in the axial direction with the bonding tip sandwiched between the two molds; a casting step of casting a molten metal into a cavity formed between the first mold and the second mold, and cooling the cast molten metal to enclose the joining tip with a cast metal material; Prepare.

According to the cast product of claim 1, since the regulating surface facing the axial direction along the imaginary axis orthogonal to the joint surface is in contact with the cast metal material, the joint tip encased in the cast metal material is moved in the axial direction. It can be difficult to get out. In addition, the joining tip is cast in the casting part in a state in which the joint surface of the head and the distal ends of the legs protruding axially from the back surface of the head are exposed. Therefore, when the cast metal material is cast, the joint surface and the distal end of the leg portion are brought into contact with the mold, and the joint chip can be sandwiched between the molds in the axial direction. Since the rigidity in the axial direction of the legs is lower than the rigidity in the axial direction of the head, the legs can be easily compressed and deformed in the axial direction when the joining tip is sandwiched between the dies in the axial direction. Since the joint surface can be pressed against the mold by the reaction force generated when the legs are deformed, burrs due to the cast metal material are less likely to occur on the joint surface during casting.

According to the casting product of claim 2, in addition to the effects of the casting product of claim 1, the following effects are obtained. A leg located outside in a transverse direction perpendicular to the imaginary axis has an inner surface facing the imaginary axis and an outer surface opposite the inner surface. Since at least a part of the inner and outer surfaces of the legs in the axial direction move away from the virtual axis toward the distal end, when the joining tip is axially sandwiched, the legs of the parts that leave are of leaf springs or disc springs. It can be compressed and deformed in the axial direction. As a result, it is possible to ensure the reaction force when the legs that press the joint surface against the mold are deformed, so that burrs are less likely to occur on the joint surface during casting.

According to the casting product of claim 3, in addition to the effects of the casting product of claim 2, the following effects are obtained. The outer surface of the leg that widens away from the virtual axis toward the tip is at least part of the regulating surface that contacts the cast metal material, and the entire leg having the outer surface extends along the entire circumference of the virtual axis. It is formed in a cylindrical shape to surround. Even if a load is applied to the joint tip toward the joint surface side of the axial direction with respect to the cast metal material, it is difficult for the joint tip to deform such that the outer surface of the leg that widens toward the tip narrows. can be made more difficult to come off from the cast metal material. Thereby, the bonding strength between the bonding tip and the cast metal material can be improved.

According to the casting product of claim 4, in addition to the effects of the casting product of claim 3, the following effects are obtained. The joint tip encased in the casting part is formed by plastically deforming the leg of a self-piercing rivet having a cylindrical leg projecting from the back surface of the head. Since the self-piercing rivet can be used as the joining tip, the cost of the joining tip can be reduced as compared with the case of using the joining tip manufactured as a special product for casting into the cast metal material.

According to the casting product of claim 5, in addition to the effects of the casting product of any one of claims 1 to 4, the following effects are obtained. The cast metal material includes an outer portion of the cast-in portion that extends outward in a direction perpendicular to the imaginary axis. Since the thickness in the axial direction of the cast-in portion is greater than the thickness in the axial direction of the outer portion, the strength and rigidity of the cast metal material around the joining tip can be increased. As a result, the bonding strength between the bonding tip and the cast metal material can be further improved.

A structure according to claim 6 comprises the cast product according to any one of claims 1 to 5 and a mating member made of iron-based metal to be joined to the joint surface of the cast product. There is an effect similar to either.

A method for manufacturing a cast product according to claim 7, wherein a joining tip made of iron-based metal having a joint surface and a control surface facing in an axial direction along one imaginary axis perpendicular to the joint surface; A cast metal stock made of a non-ferrous metal having a bonding tip encased in a cast metal stock. In the deforming step, the first die and the second die are brought closer to each other in an axial direction perpendicular to the joint surface while the joint tip is sandwiched between the first die and the second die with which the joint surfaces of the joint tip are in contact. This compresses and deforms the joining tip in the axial direction. Then, in the casting process, molten metal is cast into the cavity formed between the first mold and the second mold in the deformation process, and the joint tip is formed by a cast metal material formed by cooling the cast molten metal. cast in In the casting step, the joining tip can be encapsulated in the cast metal material while the joining surface is pressed against the first die by a reaction force when the joining tip is compressed and deformed in the deformation step. As a result, when the cast metal material is cast, burrs due to the cast metal material are less likely to occur between the mold and the joining surface.

According to the casting product manufacturing method of claim 8, in addition to the effects of the casting product manufacturing method of claim 7, the following effects are obtained. The joint tip includes a head having a surface to be joined, and legs protruding axially from the rear surface of the head. The leg arranged outside in the direction perpendicular to the imaginary axis has a tip part away from the back surface, an inner surface facing the imaginary axis, and an outer surface opposite to the inner surface. In the deformation step, the first die and the second die are axially approached to press the tip portion against the second die, so that at least a part of the inner surface and the outer surface of the leg portion in the axial direction move toward the tip portion along a virtual axis. plastically deform the leg away from the As a result, the outer surface in contact with the cast metal material can be protruded in the direction perpendicular to the axis after the casting process, or the amount of protrusion can be increased. . Furthermore, the joint surface can be pressed against the first mold by the reaction force generated when the legs are plastically deformed. As described above, the work of forming the leg portion into a shape that makes it difficult for the joint tip to come off from the cast metal material after the casting process and the work of pressing the joint surface against the first die can be performed at the same time. can be simplified.

According to the casting product manufacturing method of claim 9, in addition to the effects of the casting product manufacturing method of claim 8, the following effects are obtained. The second mold is provided with a sloped surface that slopes down as it moves away from the imaginary axis at the site where the leg is pressed by the deformation process. In the deformation step, the legs can be plastically deformed along the inclined surfaces, so that variation in the shape of the legs after plastic deformation can be reduced. As a result, the quality stability of the cast product can be improved.

According to the casting product manufacturing method of claim 10, in addition to the effects of the casting product manufacturing method of claim 8 or 9, the following effects are obtained. The leg is formed in a tubular shape surrounding the imaginary axis at least partially in the axial direction. In the deformation step, after the holding portion of the second mold is inserted into the inner surface of the tubular leg portion, the joining surface is brought into contact with the first mold so that the first mold and the second mold approach each other in the axial direction. It is possible to prevent the joining tip from being cast in a misaligned position. As a result, the positional accuracy of the joining tip with respect to the cast metal material can be improved, and the quality stability of the cast product can be improved.

(a) is a plan view of a structure in which a mating member is joined to a cast product in the first embodiment, and (b) is a cross-sectional view of the structure taken along line Ib-Ib in FIG. FIG. 4 is a cross-sectional view of the joining tip and mold before deformation; FIG. 4 is a cross-sectional view of the bonding tip and mold after deformation; FIG. 10 is a cross-sectional view of the joining tip and the mold before deformation in the second embodiment; (a) is a cross-sectional view of a joint tip and a mold after deformation, and (b) is a cross-sectional view of a structure in which a mating member is joined to a cast product. (a) is a perspective view of a joint tip in a third embodiment, (b) is a cross-sectional view of the joint tip and the mold after deformation, and (c) is a structure in which a mating member is joined to a cast product. 1 is a cross-sectional view of an object; FIG.

Preferred embodiments are described below with reference to the accompanying drawings. First, the structure 1 will be described with reference to FIGS. 1(a) and 1(b). A structure 1 is formed by joining a mating member 2 to a casting product 10 .

A cast product 10 has a plurality of (two in the present embodiment) joining tips 20 encapsulated in a cast metal material 11 . The cast metal material 11 is made of non-ferrous metals such as aluminum, magnesium, zinc, and alloys containing them as main components, which are particularly difficult to weld to ferrous metals. In this embodiment, the cast metal material 11 is made of an aluminum alloy. The joining tip 20 and the mating member 2 are made of ferrous metal.

The cast metal material 11 is formed in a plate shape with the first surface 12 facing the mating member 2 . The cast metal material 11 comprises an annular cast-injection portion 14 provided around the joining tip 20 and an outer portion 15 connected to the outer periphery of the cast-injection portion 14 (the outer side in the direction perpendicular to an imaginary axis A, which will be described later). I have. On the second surface 13 of the cast metal material 11 opposite to the first surface 12 , a casting cavity portion 14 protrudes with respect to the outer portion 15 . That is, among the thicknesses of the cast metal material 11 from the first surface 12 to the second surface 13, the thickness T1 of the casting portion 14 is thicker than the thickness T2 of the outer portion.

The joint tip 20 has a disk-shaped head 21 and a tubular leg 25 protruding from the head 21, which are integrally formed. A surface of the head portion 21 is a bonding surface 22 exposed from the first surface 12 while the bonding tip 20 is encapsulated in the cast metal material 11 . The joint surface 22 and the first surface 12 are positioned on the same plane. By resistance welding with the joint surface 22 exposed from the first surface 12 in contact with the mating member 2, a nugget N is formed at the interface between the joint surface 22 and the mating member 2, and the joint surface 22 and the mating member 2 are formed. The side member 2 is joined.

A first regulating surface 24 (part of the regulating surface), which is the outer peripheral surface of the head 21 , is tapered from the joint surface 22 toward the rear surface 23 of the head 21 . That is, the first restricting surface 24 faces the opposite side of the joint surface 22 (mating member 2 ) in the axial direction D along one imaginary axis A orthogonal to the joint surface 22 . In addition, in this embodiment, the virtual axis A passes through the center of the joint surface 22 . Since the cast metal material 11 is in contact with the first restricting surface 24 , the joining tip 20 can be immovably restrained to the cast metal material 11 in the axial direction D opposite to the mating member 2 . Therefore, even if a load is applied in a direction in which the mating member 2 and the cast metal material 11 approach each other, the joining tip 20 is less likely to come off from the cast metal material 11 .

In addition, in this embodiment, since the mating member 2 is in contact with the first surface 12 of the cast metal material 11, the mating member 2 and the cast metal material 11 do not approach any more. Therefore, the first regulation surface 24 can be omitted.

The leg portion 25 is a portion protruding in the axial direction D from the rear surface 23 of the head portion 21 . The leg portion 25 is arranged outside in a direction perpendicular to the virtual axis A, and formed in a tubular shape surrounding the virtual axis A along the entire circumference in the axial direction D. As shown in FIG. The axial direction D is the same as the thickness direction of the cast metal material 11 . The joining tip 20 is formed axially symmetrical about the virtual axis A. As shown in FIG.

The leg 25 has a tip 26 remote from the back surface 23 , an inner surface 27 facing the imaginary axis A, and an outer surface 28 opposite to the inner surface 27 . With the tip portion 26 exposed from the second surface 13 and the joint surface 22 exposed from the first surface 12, the head portion 21 and the leg portion 25 are cast into the casting portion 14 over the entire circumference around the virtual axis A. wrapped up. As a result, the joining tip 20 can be restrained by the cast metal material 11 so as not to move in the direction perpendicular to the virtual axis A. As shown in FIG.

The inner surface 27 and the outer surface 28 widen away from the imaginary axis A along the entire axial direction D toward the distal end portion 26 . Since the leg portion 25 is formed like a disc spring in this way, the rigidity in the axial direction D of the leg portion 25 can be made lower than the rigidity in the axial direction D of the head portion 21 .

Parts of the inner surface 27 and the back surface 23 are exposed from the second surface 13 . Therefore, when the joining tip 20 is resistance-welded (particularly direct spot welding) to the mating member 2, one electrode (not shown) is brought into contact with the mating member 2 while the other electrode (not shown) is applied. It can be applied to the inner surface 27 or the back surface 23 . Since foreign material such as non-ferrous metal can be prevented from being sandwiched between the electrode and the joining tip 20, the barrier between the joining surface 22 of the joining tip 20 and the electrode can be reduced, and good quality resistance welding can be performed. be able to.

An outer surface 28 that widens away from the virtual axis A toward the distal end portion 26 is a second regulating surface (part of the regulating surface) facing the joint surface 22 (mating member 2) in the axial direction D. Since the cast metal material 11 is in contact with the outer surface 28 , the joining tip 20 can be restrained by the cast metal material 11 so as not to move toward the mating member 2 in the axial direction D. Therefore, even if a load is applied in a direction separating the mating member 2 and the cast metal material 11 , the joining tip 20 can be made difficult to come off from the cast metal material 11 . As a result, the bonding strength between the cast metal material 11 and the bonding tip 20 can be ensured.

Since the leg portion 25 is formed in a cylindrical shape with the outer surface 28 widening toward the tip portion 26 , a load is applied to the joining tip 20 in the direction (axial direction D) in which the mating member 2 and the cast metal material 11 separate. However, it is possible to make it difficult to deform the leg portion 25 so that the widened outer surface 28 narrows. As a result, the joining tip 20 can be made difficult to come off from the cast metal material 11, and the joining strength between the casting metal material 11 and the joining tip 20 can be improved.

Furthermore, since the thickness T1 of the casting part 14 around the joining tip 20 is thicker than the thickness T2 of the outer part 15, the strength and rigidity of the cast metal material 11 around the joining tip 20 can be increased. As a result, when a load is applied in the direction in which the joining tip 20 comes off, the casting part 14 can be made difficult to break, so that the joining strength between the cast metal material 11 and the joining tip 20 can be improved. Moreover, since the thickness T2 of the outer portion 15 can be reduced, the weight of the cast metal material 11 can be reduced.

Next, a method for manufacturing the cast product 10 will be described with reference to FIGS. 2 and 3. FIG. In the state before completion of clamping shown in FIG. 2, the joint tip 20 has a different shape of the leg portion 25 from the joint tip 20 encapsulated in the cast metal material 11 shown in FIG. 1(b). Specifically, the joining tip 20 before mold clamping is a self-piercing rivet before plastic deformation, and has a cylindrical leg portion 25 with an outer surface 28 having a substantially constant outer diameter. The inner surface 27 of the joining tip 20 before mold clamping (before plastic deformation) has a part of the inner diameter on the tip end 26 side that gradually expands toward the tip end 26, and the other inner diameter is formed to be substantially constant. . The self-piercing rivet is, for example, driven into the upper member of two vertically stacked members, so that the tip of the cylindrical leg portion 25 is plastically deformed so as to expand outward in the direction perpendicular to the axis. The widened tip bites into the lower member to join the two members.

A mold 30 for molding the cast metal material 11 is a die-cast mold configured to be cast with a molten non-ferrous metal such as an aluminum alloy, a magnesium alloy, or a zinc alloy. The mold 30 includes a fixed mold 30a (first mold) and a movable mold 30c capable of mold clamping and mold opening by relatively moving in the axial direction D with respect to the fixed mold 30a.

In the clamped state shown in FIG. 3, a cavity 31 is formed between the molding surface 30b of the fixed mold 30a and the molding surface 30d of the movable mold 30c. The first surface 12 of the cast metal material 11 is formed by the molding surface 30b, and the second surface 13 of the cast metal material 11 is mainly formed by the molding surface 30d. A mounting hole 30e is formed through the movable mold 30c in the axial direction D so as to open to the molding surface 30d. The holding device 32 is fitted in the mounting hole 30e, and the holding device 32 is fixed to the movable die 30c. The holding device 32 is a device for holding the bonding tip 20 at a predetermined position in the cavity 31 . When the joint tip 20 is cast in a plurality of places of the cast metal material 11, a holding device 32 is provided at each position where the joint tip 20 is cast in. As shown in FIG.

The holding device 32 includes a cylindrical main body 33 (second die) that is fitted and fixed in the mounting hole 30e of the movable die 30c, and a shaft-shaped holding portion 34 that partially protrudes from the main body 33 toward the fixed die 30a. , a sliding portion 35 fixed to the holding portion 34 and sliding in the main body 33, a shaft-shaped stopper portion 36 projecting from the sliding portion 35 to the side opposite to the holding portion 34, and around the stopper portion 36 a coil spring 37 arranged in the body 33;

The main body 33 is part of the mold 30 and forms part of the cavity 31 with a molding surface 33c at one end in the axial direction. The central axis of the cylindrical main body 33 is the same as the imaginary axis A of the bonding tip 20 set on the holding device 32 . The inner peripheral surface of the main body 33 includes a small-diameter inner surface 33a that opens to the molding surface 33c, and a large-diameter inner surface 33b that has a larger inner diameter than the small-diameter inner surface 33a. The large-diameter inner surface 33b is continuous with the small-diameter inner surface 33a via a step, and opens to the axial end surface on the side opposite to the molding surface 33c.

The molding surface 33c includes an inclined surface 33d that slopes downward as it separates from the virtual axis A (the small-diameter inner surface 33a), and a concave surface 33e that continues to the outer peripheral edge of the inclined surface 33d. The outer peripheral edge is formed on the same plane as the molding surface 30d. 33 d of inclined surfaces and the concave surface 33e are formed over the perimeter of the periphery of the imaginary axis A. As shown in FIG. The concave surface 33e is a portion recessed in the axial direction D with respect to the outer peripheral side (the outer peripheral edge of the molding surface 33c and the molding surface 30d). The concave surface 33e forms the cast casting portion 14 having a thickness T1 larger than the thickness T2 of the outer portion 15. As shown in FIG.

The holding portion 34 is a shaft-like member that is inserted into the small-diameter inner surface 33a and partially protrudes from the molding surface 33c. The holding portion 34 has an axial tip 34a into which the inner surface 27 of the leg portion 25 of the joint tip 20 before mold clamping fits, and a proximal end 34b axially opposite to the tip 34a.

The sliding portion 35 is a portion fixed around the proximal end 34b, and slides axially on the large-diameter inner surface 33b. As the sliding portion 35 slides, the amount of protrusion of the holding portion 34 from the molding surface 33c changes. As shown in FIG. 2, when the sliding portion 35 hits the step between the large diameter inner surface 33b and the small diameter inner surface 33a, the protrusion amount of the holding portion 34 from the molding surface 33c is maximized. Due to the elastic force of the coil spring 37 sandwiched between the holding plate 38 closing the opening of the main body 33 by the large-diameter inner surface 33b and the sliding portion 35, the sliding portion is formed on the step between the large-diameter inner surface 33b and the small-diameter inner surface 33a. 35 is pressed.

Further, when the sliding portion 35 is slid toward the holding plate 38 while compressing the coil spring 37, a stopper portion 36 connected to the sliding portion 35 is provided so that the tip 34a does not completely enter the small-diameter inner surface 33a. It abuts on the presser plate 38 and restricts the movement of the sliding portion 35 . As a result, it is possible to prevent molten metal from entering the inside of the small-diameter inner surface 33a.

In order to manufacture the casting product 10, first, with the fixed mold 30a and the movable mold 30c opened, the holding portion 34 is inserted into the leg portion 25 of the joining tip 20, and the joining tip 20 is set in the holding portion 34. . After that, in the middle of clamping the movable mold 30c and the main body 33 toward the fixed mold 30a in the axial direction D, as shown in FIG. do. Then, when the movable mold 30c and the main body 33 are brought closer to the fixed mold 30a in the axial direction D, the coil spring 37 is compressed and the sliding portion 35 slides within the large diameter inner surface 33b. A tip portion 26 of the leg portion 25 hits the inclined surface 33d of the molding surface 33c.

From this state, the fixed mold 30a, the movable mold 30c, and the main body 33 are brought closer together (deformation step). Then, as shown in FIG. 3, the leg portion 25 pressed against the inclined surface 33d is plastically deformed along the inclined surface 33d, that is, while the leg portion 25 is compressed and deformed in the axial direction D, the stationary die 30a and the movable die A cavity 31 is formed by 30c and body 33 . The rigidity of the leg portion 25 is set low so that the fixed die 30a and the main body 33 hardly deform when the leg portion 25 is sandwiched between the fixed die 30a and the main body 33 and is compressed and deformed. After the deformation process, the molten metal is cast into the cavity 31, and the joint tip 20 is cast with the cast metal material 11 formed by cooling the cast molten metal (casting process), whereby the cast product 10 is manufactured. .

In this casting process, the dimension between the body 33 and the fixed mold 30a sandwiching the joining tip 20 in the axial direction D may increase due to the influence of thermal expansion of the mold 30 due to the high-temperature molten metal. Further, by repeating the deformation process and the casting process, the dimension between the fixed mold 30a and the main body 33 that sandwiches the joining tip 20 may gradually widen. However, since the casting process is performed in a state in which the leg portion 25 is compressed and deformed (plastic deformation and elastic deformation) in the axial direction D, the gap between the fixed die 30a and the main body 33 widens due to the elastic reaction force during the compression deformation. However, the joint surface 22 can be pressed against the fixed mold 30a, and the gap between the joint surface 22 and the fixed mold 30a can be prevented from widening. As a result, the joining tip 20 can be encapsulated with the cast metal material 11 while maintaining the state of pressing the joining surface 22 against the fixed mold 30a. This makes it difficult to generate burrs on the joint surface 22 due to the cast metal material 11 .

Further, in the casting process, the inner surface 27 and the outer surface 28 of the leg portion 25 between the fixed mold 30a and the main body 33 are separated from the virtual axis A as they move toward the tip portion 26. The leg portion 25 is sandwiched between. Since the disc spring-like portion moving away from the virtual axis A is compressed and deformed in the axial direction D, it is possible to secure a reaction force when the leg portion 25 is deformed to press the joint surface 22 against the fixed mold 30a in the casting process. As a result, burrs are less likely to occur on the joint surface 22 during casting.

The outer surface 28 parallel to the imaginary axis A before the deformation process can be projected in the direction perpendicular to the imaginary axis A by the deformation process. As a result, when the outer surface 28 comes into contact with the cast metal material 11 after the casting process, the joint tip 20 can be made difficult to slip out of the cast metal material 11 in the axial direction D, and the joint surface 22 is fixed by the reaction force generated when the leg 25 is plastically deformed. It can be pressed against the mold 30a. Therefore, the work of forming the leg portion 25 into a shape that makes it difficult for the joint tip 20 to come off from the cast metal material 11 after the casting process and the work of pressing the joint surface 22 against the fixed mold 30a can be performed simultaneously by the deformation process. The manufacturing process of the product 10 can be simplified.

Furthermore, in the deformation step, the leg 25 is pressed against the inclined surface 33d that slopes down as it moves away from the virtual axis A, and the leg 25 can be plastically deformed along the inclined surface 33d. 25 can be made smaller. As a result, the quality stability of the cast product 10 can be improved in that the variation in the bonding strength between the bonding tip 20 and the cast metal material 11 can be reduced. In addition, the stability of the quality of the structure 1 can be improved in that variations in the bonding strength between the cast metal material 11 and the mating member 2 via the bonding tip 20 can be reduced.

In the deformation step, after inserting the holding portion 34 into the inner surface 27 of the tubular leg portion 25, the joining surface 22 is brought into contact with the fixed mold 30a and clamped, so that the joining tip 20 is cast in a shifted position. You can prevent it from slipping. As a result, the positional accuracy of the joining tip 20 with respect to the cast metal material 11 can be improved, and the quality stability of the cast product 10 can be improved. Moreover, since the casting product 10 can be resistance-welded to an appropriate position of the mating member 2 via the joining tip 20, the stability of the quality of the structure 1 can be improved.

By compressing and deforming the leg portion 25 in the axial direction D in the deformation step, the distal end portion 26 of the cylindrical leg portion 25 can be pressed against the main body 33 over the entire circumference by the reaction force generated during the deformation. This makes it difficult for the molten metal to enter the inner surface 27 side of the leg portion 25 during the casting process, and makes it difficult for the cast metal material 11 to adhere to the inner surface 27 and part of the back surface 23 inside the inner surface 27 . As a result, when the joining tip 20 of the cast product 10 is resistance-welded to the mating member 2, the electrode is directly applied to the inner surface 27 and the back surface 23 without removing the cast metal material 11 adhering to the inner surface 27 and the back surface 23. Good quality resistance welding can be performed.

Even if the manufacturing method of the casting product 10 is not actually confirmed, the manufacturing method can be known by checking the manufactured casting product 10 . For example, when manufacturing the cast product 10, the joint surface 22 is brought into contact with the fixed mold 30a, the tip portion 26 is brought into contact with the main body 33, and the joint tip 20 is placed between the fixed mold 30a and the main body 33 in the axial direction D. sandwiched between Therefore, in the casting product 10 shown in FIG. Furthermore, since the legs 25 are compressed and deformed in the axial direction D when the casting product 10 is manufactured, the stiffness of the legs 25 in the axial direction D is greater than the stiffness of the head 21 in the axial direction D. low.

Therefore, in the manufactured cast product 10, if the joint surface 22 and the tip portion 26 are exposed from the cast metal material 11, and the rigidity in the axial direction D of the leg portion 25 is lower than the rigidity in the axial direction D of the head portion 21, The cast product 10 can be manufactured by the above-described manufacturing method in which the casting process is performed while the joint surface 22 is pressed against the fixed mold 30a by the elastic reaction force of the leg portion 25 compressed and deformed in the axial direction D. Therefore, according to the cast product 10 in which the joint surface 22 and the tip portion 26 are exposed from the cast metal material 11, and the rigidity in the axial direction D of the leg portion 25 is lower than the rigidity in the axial direction D of the head portion 21, the cast product When casting 10, burrs due to the cast metal material 11 can be made less likely to occur on the joint surface 22. - 特許庁

In addition, since the casting process is performed with the joint tip 20 sandwiched between the fixed mold 30a and the main body 33, the cast metal material 11 is in close contact with the periphery of the joint tip 20, so that the leg portion of the cast product 10 after production is reduced. The shape of 25 is substantially the same as the shape of leg 25 after the deformation process and during the casting process. Therefore, since the inner surface 27 and the outer surface 28 of the cast product 10 after manufacture move away from the imaginary axis A toward the distal end portion 26, the leg portion 25, which is compressively deformable in the axial direction D like a disc spring, extends in the axial direction D. It can be seen that the casting process was performed by compression deformation to . Therefore, according to such a shape of the leg portion 25 of the cast product 10, when the cast product 10 is manufactured, it is possible to secure a reaction force when the leg portion 25 is deformed to press the joint surface 22 against the fixed mold 30a. Burrs are less likely to occur on the joint surface 22 .

The joining tip 20 encapsulated in the cast metal material 11 is formed by plastically deforming the leg portion 25 of a self-piercing rivet having a cylindrical leg portion 25 projecting from the back surface 23 of the head portion 21 . Since the self-piercing rivet can be used as the joining tip 20, the cost of the joining tip 20 can be reduced compared to the case of using the joining tip 20 manufactured as a dedicated product for casting into the cast metal material 11.例文帳に追加In addition, by using a self-piercing rivet treated to prevent electrolytic corrosion for the joining tip 20, the joining tip 20 and the cast metal material 11 can be easily and stably prevented from electrolytic corrosion.

A self-piercing rivet is essentially driven into two members, with the legs 25 being plastically deformed such that the inner and outer surfaces 27 and 28 of the legs 25 move away from the imaginary axis A toward the tip 26. It joins members. Since the self-piercing rivet (bonding tip 20) having the same shape as the original method of use is encapsulated in the cast metal material 11, the bonding strength between the bonding tip 20 and the cast metal material 11 is reduced to the original value of the self-piercing rivet. It can be easily guessed from the bonding strength obtained by the method of use.

Next, a second embodiment will be described with reference to FIGS. 4 to 5(b). 1st Embodiment demonstrated the case where the whole of the axial direction D of the leg part 25 was formed in a cylinder shape. On the other hand, in the second embodiment, a case where a part of the leg portion 41 in the axial direction D is formed in a tubular shape will be described. The same reference numerals are given to the same parts as in the first embodiment, and the following description is omitted.

As shown in FIG. 4, the joining tip 40 before die clamping includes a head 21 having a joining surface 22 and legs 41 protruding from the back surface 23 of the head 21 in the axial direction D. are integrally molded. The leg portion 41 is arranged outside the virtual axis A in the axis-perpendicular direction. The leg portion 41 includes a cylindrical portion 42 that is provided on the back surface 23 side in the axial direction D and surrounds the entire circumference of the virtual axis A, and protrudes in the axial direction D from a part of the end surface of the cylindrical portion 42 in the axial direction D. and a protruding piece 43 that

The cylindrical portion 42 has a cylindrical shape centered on the virtual axis A, and has an inner surface 42a facing the virtual axis A and an outer surface 42b opposite to the inner surface 42a, which are formed substantially parallel to the virtual axis A. The holding portion 34 is inserted into the inner surface 42 a of the cylindrical portion 42 . The projecting piece 43 is a portion that is compressed and deformed mainly in the axial direction D during the deformation process. The protruding piece 43 has a tip portion 26 separated from the back surface 23 , an inner surface 45 facing the virtual axis A, and an outer surface 46 opposite to the inner surface 45 .

The inner surface 45 and the outer surface 46 are continuous with the inner surface 42a and the outer surface 42b of the cylindrical portion 42 in the axial direction D, respectively. The inner surface 45 and the outer surface 46 widen away from the imaginary axis A along the entire axial direction D toward the distal end portion 26 . Since the protruding piece 43 (part of the leg portion 41) is formed like a plate spring in this way, the axial rigidity of the protruding piece 43 can be made lower than the rigidity of the head portion 21 and the tubular portion 42 in the axial direction D. .

A mold 50 for molding a cast metal material 48 (see FIG. 5(b)) in which the joining tip 40 is encapsulated includes a fixed mold 50a (first mold) and an axial direction D with respect to the fixed mold 50a. are movable molds 50b capable of clamping and opening molds by relatively moving in the vertical direction (horizontal direction in FIG. 4), and movable molds 50d by relatively moving in the axial direction D in mounting holes 30e provided in the movable molds 50d. and a clampable retaining device 52 . A cavity 31 is formed between the molding surface 30b of the fixed mold 50a and the molding surface 30d of the movable mold 50b. A holding device 52 is inserted into a mounting hole 30e opened in the molding surface 30d of the movable mold 50b.

A main body 53 (second mold) of the holding device 52 is a moving core that moves in an axial direction D different from the clamping direction of the fixed mold 50a and the movable mold 50b. ) in the axial direction D. The main body 53 is a cylindrical member whose central axis is the virtual axis A of the joint tip 40 held by the holding portion 34 of the holding device 52 . A molding surface 54, which is one axial end of the main body 53, is formed on a plane perpendicular to the virtual axis A. As shown in FIG.

To manufacture the casting product 47, first, the fixed mold 50a and the movable mold 50b are clamped. At this time, the holding device 52 and the joining tip 40 are placed in the mounting hole 30e so that the joining tip 40 held by the holding device 52 does not protrude from the molding surface 30d toward the fixed mold 50a. After clamping the molds, as shown in FIG. 5(a), the body 53 is moved axially toward the molding surface 30b of the fixed mold 50a until the molding surface 54 of the main body 53 becomes flush with the molding surface 30d of the movable mold 50b. A cavity 31 is formed by approaching D (deformation step).

In this deformation step, after the bonding surface 22 of the bonding tip 40 held by the holding portion 34 hits the forming surface 30b, the tip portion 26 of the projecting piece 43 hits the forming surface 54, and then the main body 53 is further formed. It is made to approach the surface 30b. Then, since the rigidity in the axial direction D of the protruding piece 43 is lower than the rigidity in the axial direction D of the head 21 and the cylindrical portion 42, the protruding piece is in the state shown by the two-dot chain line in FIG. 43 is compressed and deformed in the axial direction D. After the deformation process, the inner surface 45 and the outer surface 46 are wider than before the deformation process.

After the deformation process, molten metal is cast into the cavity 31, and the joint tip 40 is cast (casting process) with a cast metal material 48 (casting portion) formed by cooling the cast molten metal. As shown in (b), a casting product 47 is produced. The structure 49 is manufactured by contacting the mating surface 22 of the casting product 47 with the mating member 2 and resistance welding the mating surface 22 and the mating member 2 . As in the first embodiment, the mating member 2 and the joining tip 40 are made of ferrous metal, and the cast metal material 48 is made of non-ferrous metal such as aluminum, magnesium, zinc, or alloys containing them as main components.

Since the casting process is performed in a state in which the joint surface 22 is pressed against the molding surface 30b of the fixed mold 50a by the reaction force of the protruding piece 43 that is compressed and deformed in the axial direction D, the melt is formed in the gap between the joint surface 22 and the fixed mold 50a. It is possible to make it difficult for metal to enter and to make it difficult for burrs due to the cast metal material 48 to occur on the joint surface 22 . In particular, since the protruding piece 43 protrudes from a portion of the cylindrical portion 42 in the circumferential direction, the protruding piece 43 can be easily compressed and deformed in the axial direction D, and the reaction force at the time of deformation can be increased. As a result, burrs are less likely to occur on the joint surface 22 during casting.

Since the protruding piece 43 protrudes from a portion of the cylindrical portion 42 in the circumferential direction, the cast metal material 48 can be brought into contact with not only the outer surface 46 but also the inner surface 45 of the protruding piece 43 . Since the inner surface 45 (part of the first restricting surface) and the outer surface 46 (second restricting surface) widen away from the imaginary axis A toward the distal end portion 26, that is, the inner surface 45 and the outer surface 46 Since they are directed to both sides in the axial direction D, the joining tip 40 can be restrained to the cast metal material 48 so as not to move in the axial direction D.

Furthermore, since the cast metal material 48 is also in contact with the inner surface 45 of the protruding piece 43 , even if a load is applied to the joining tip 40 in the direction in which the mating member 2 and the cast metal material 48 separate, the load is increased toward the distal end portion 26 . It is possible to make it difficult to deform the protruding piece 43 so that the outer surface 46 away from the virtual axis A approaches the virtual axis A. - 特許庁As a result, the joining tip 40 can be made more difficult to come off from the cast metal material 48, and the joining strength between the casting metal material 48 and the joining tip 40 can be further improved.

Since the joining tip 40 is cast in the cast metal material 48 in a state in which the spread of the inner surface 45 and the outer surface 46 is enlarged by the deformation process, the joining strength between the cast metal material 48 and the joining tip 40 is greater than when the spread is small. can be improved. In the casting process, the work of forming the leg portion 41 into a shape that makes it difficult for the joint tip 40 to come off from the cast metal material 48 after the casting process and the work of pressing the joint surface 22 against the fixed mold 50a can be performed at the same time. 47 can be simplified.

Since the casting process is performed with the holding portion 34 inserted into the inner surface 42 a of the cylindrical portion 42 , the portion of the casting product 47 where the holding portion 34 was inserted becomes hollow, and a part of the back surface 23 of the joining tip 40 is formed. The inner surface 42a can be exposed from the cast metal stock 48. As shown in FIG. Therefore, when the joining tip 40 is resistance-welded to the counterpart member 2, one electrode (not shown) is brought into contact with the counterpart member 2 while the other electrode (not shown) is brought into contact with the inner surface 42a or the back surface 23. can be done. Since foreign materials such as non-ferrous metals can be prevented from being sandwiched between the electrode and the joining tip 40, the barrier between the joining surface 22 of the joining tip 40 and the electrode can be reduced, and good quality resistance welding can be performed. be able to.

Next, a third embodiment will be described with reference to FIGS. 6(a) to 6(c). 1st Embodiment demonstrated the case where the cylindrical leg part 25 protruded from the disk-shaped head 21. FIG. On the other hand, in the third embodiment, a case where two plate-like leg portions 62 protrude from a rectangular plate-like head portion 61 will be described. The same reference numerals are given to the same parts as in the first embodiment, and the following description is omitted.

As shown in FIG. 6( a ), the joint tip 60 before die clamping includes a square plate-shaped head 61 having a joint surface 22 and a pair of heads 61 projecting in the axial direction D from the back surface 23 of the head 61 . legs 62, 62, which are integrally molded. The pair of leg portions 62, 62 are plate-like portions formed to extend in a specific direction out of the directions perpendicular to the virtual axis A, and sandwich the virtual axis A in a direction perpendicular to the specific direction. facing each other.

The leg 62 has a tip 26 remote from the back surface 23 , an inner surface 27 facing the imaginary axis A, and an outer surface 28 opposite the inner surface 27 . The inner surface 27 and the outer surface 28 spread apart from the imaginary axis A toward the tip portion 26 along the entire axial direction D before mold clamping. Since the leg portion 62 is formed in the shape of a leaf spring in this manner, the rigidity in the axial direction of the leg portion 62 can be made lower than the rigidity in the axial direction D of the head portion 61 .

As shown in FIG. 6(b), a mold 64 for molding a cast metal material 72 (see FIG. 6(c)) in which the joining tip 60 is encapsulated includes a fixed mold 65 (first mold) and a fixed mold 65 (first mold). A movable mold 66 (second mold) that can be clamped by moving relative to the mold 65 in the axial direction D is provided. A cavity 31 is formed between the fixed mold 65 and the movable mold 66 by this mold clamping.

A recess 67 recessed in the axial direction D is formed in the molding surface 30b of the fixed die 65 . A magnet 68 is provided on the fixed die 65 so as to be exposed at the bottom of the recess 67 . As a result, the bonding surface 22 is attracted to the bottom of the recess 67 by the magnetic force of the magnet 68 , and the head 61 of the bonding tip 60 can be fixed to the recess 67 . With the head 61 fitted in the recess 67 , the movable mold 66 is brought closer to the fixed mold 65 in the axial direction D and clamped, so that the joint tip 60 is moved in the axial direction D by the fixed mold 65 and the movable mold 66 . The legs 62 are compressed and deformed in the axial direction from the state indicated by the two-dot chain line in FIG. 6B (deformation step). After the deformation process, the inner surface 27 and the outer surface 28 are wider than before the deformation process.

After the deformation process, the molten metal is cast into the cavity 31, and the joint tip 60 is cast in the cast metal material 72 (casting portion) formed by cooling the cast molten metal (casting process). As shown in (c), a casting product 71 is produced. Since the tip portion 26 of the leg portion 62 is pressed against the movable mold 66 during the casting process, part of the tip portion 26 is linearly exposed from the second surface 13 of the cast metal material 72 in the manufactured casting product 71. is doing.

The structure 70 is manufactured by bringing the mating surface 22 of the casting product 71 into contact with the mating member 2 and resistance-welding the mating surface 22 and the mating member 2 . As in the first and second embodiments, the mating member 2 and the joining tip 60 are made of ferrous metal, and the cast metal material 72 is made of non-ferrous metal such as aluminum, magnesium, zinc, or alloys containing them as main components. be.

Since the casting process is performed in a state where the joint surface 22 is pressed against the fixed mold 65 by the reaction force of the leg portion 62 that is compressed and deformed in the axial direction D, the molten metal enters the gap between the joint surface 22 and the fixed mold 65. This makes it difficult to generate burrs on the joint surface 22 due to the cast metal material 72 . Compared to the first embodiment in which the leg portion 25 is cylindrical, the leg portion 62 of the third embodiment is plate-shaped, so that the leg portion 62 can be easily compressed and deformed in the axial direction D, and the reaction force at the time of deformation can be reduced. I can do it strongly. As a result, burrs are less likely to occur on the joint surface 22 during casting.

Since the leg portion 62 is plate-shaped and the joint tip 60 is cast in the cast metal material 72 over the entire circumference of the imaginary axis A, the outer surface of the leg portion 62 is formed around the edge of the plate-shaped leg portion 62 . The cast metal material 72 can contact the inner surface 27 as well as the 28 . As a result, as in the second embodiment, even if a load is applied to the joining tip 60 in the direction in which the mating member 2 and the cast metal material 72 are separated, the legs are arranged so that the widened outer surface 28 narrows toward the distal end portion 26 . The deformation of the portion 62 can be made difficult, and the bonding strength between the cast metal material 72 and the bonding tip 60 can be further improved.

Since the casting process is performed with the head 61 fitted in the recess 67 of the fixed mold 65 , part of the head 61 can protrude from the first surface 12 of the cast metal material 72 . As a result, the joint surface 22 can be resistance-welded to the counterpart member 2 while the first surface 12 and the counterpart member 2 are separated from each other. As a result, during resistance welding, a current can be prevented from flowing directly between the mating member 2 and the cast metal material 72, and the temperature of the Joule heat generated between the joint surface 22 and the mating member 2 can be ensured. , can perform good quality resistance welding. Furthermore, a sealing material for preventing electrolytic corrosion can be applied between the mating member 2 and the cast metal material 72 .

In addition, since the casting process is performed with the head 61 fitted in the recess 67, it is possible to prevent the joining tip 60 from being cast in a misaligned position. As a result, the positional accuracy of the joining tip 60 with respect to the cast metal material 72 can be improved, and the quality stability of the cast product 71 can be improved.

Although the present invention has been described above based on the embodiments, the present invention is by no means limited to the above embodiments, and it is easily conjectured that various improvements and modifications are possible without departing from the gist of the present invention. It is possible. For example, in the above-described first embodiment, the case where the two joint tips 20 are embedded in the cast metal material 11 has been described. The number, intervals, positions, etc., of burying 40 and 60 may be appropriately set in relation to the cast metal materials 11 , 48 and 72 and the mating member 2 . Also, the sizes and shapes of the joining tips 20 , 40 and 60 may be set according to the shapes and sizes of the cast metal materials 11 , 48 and 72 and the mating member 2 . In addition, not only when one virtual axis A passes through the center of the joint surface 22, but when the joint surface 22 and one virtual axis A are perpendicular to each other, any position of the joint surface 22 where the virtual axis A You can pass.

In the above embodiment, the joint surfaces 22 of the joint tips 20, 40, 60 are flat, but the joint surfaces are not necessarily limited to this. It is of course possible to form it into a shape. The imaginary axis A in the case where the joining surfaces are curved surfaces is an axis perpendicular to the tangential plane at a predetermined position of the curved surface exposed from the cast metal material 11 , 48 , 72 . The imaginary axis A in the case where the joining surfaces are polyhedral is an axis orthogonal to one predetermined surface of the portion exposed from the cast metal material 11 , 48 , 72 .

In the first embodiment, the case where the leg portion 25 of the joint tip 20 has a cylindrical shape surrounding the virtual axis A over the entire circumference, that is, the case where the leg portion 25 is continuous around the virtual axis A has been described. However, it is not necessarily limited to this. The legs 25 may be intermittently provided around the virtual axis A. Not only when the inner surface 27 and the outer surface 28 of the leg 25 of the casting product 10 move away from the imaginary axis A toward the tip 26 throughout the axial direction D, but at least one of the legs in the axial direction D. It is only necessary that the inner and outer surfaces of the portion recede from the virtual axis A toward the distal end portion 26 .

In the first and second embodiments described above, the case where the joint tips 20 and 40 are sandwiched between the fixed molds 30a and 50a (first mold) and the main bodies 33 and 53 (second mold) will be described. Although the case where the bonding tip 60 is sandwiched between the fixed die 65 (first die) and the movable die 66 (second die) has been described above, the present invention is not necessarily limited to this. The first die to which the joint surface 22 is pressed may be a main body (core) or a movable die, and the second die to which the tip portion 26 is pressed close to the first die in the axial direction D may be a fixed die. .

In the above-described second embodiment, the case where one protruding piece 43 protrudes from a portion of the end surface of the cylindrical portion 42 in the axial direction D has been described, but the present invention is not necessarily limited to this. A plurality of protruding pieces 43 may protrude from the tubular portion 42 . In the third embodiment, the case where the plate-shaped legs 62 are provided on both sides of the virtual axis A in the direction perpendicular to the axis has been described, but the present invention is not necessarily limited to this. Three or more legs 62 may be provided around the virtual axis A.

The rigidity in the axial direction D of the legs is lower than the rigidity in the axial direction D of the heads 21 and 61, and the legs are compressed in the axial direction D when the joining tip is sandwiched between the first die and the second die. The shape of the legs can be changed as appropriate as long as it is deformable. For example, the legs may be coil springs deformable in the axial direction D, which are joined to the back surfaces 23 of the heads 21 and 61 by welding or the like. If the leg is spring-like, the leg can be easily compressed and deformed in the axial direction D when the joining tip is sandwiched between the first die and the second die. Sufficient reaction force can be ensured during compressive deformation. In addition, the cylindrical leg portion 25 of the self-piercing rivet that has been plastically deformed in advance, that is, the joining tip 20 in the state shown in FIG. It may be elastically deformed in the direction D and the casting process may be performed in that state.

Further, a leg made of a material having lower rigidity (Young's modulus) than iron-based metal, such as an aluminum alloy, a magnesium alloy, or a zinc alloy, may be attached to the rear surface 23 . That is, if the joint surface 22 to be joined to the mating member 2 made of iron-based metal is made of iron-based metal, the entire joining tip need not be made of iron-based metal. In this case, it is preferable to provide a restriction surface for restricting movement of the bonding tip in the axial direction D with respect to the cast metal materials 11, 48, and 72 on the iron-based metal portion of the bonding tip. As a result, even if a portion not made of ferrous metal comes off from a portion made of ferrous metal in the joining tip, it is possible to prevent the joining tip from coming off from the cast metal material 11 , 48 , 72 .

In the first embodiment, the first restricting surface 24 facing the opposite side of the joint surface 22 (mating member 2) in the axial direction D is the outer peripheral surface of the head 21, and the joint surface in the axial direction D is the first restricting surface 24. Although the case where the second restricting surface facing the 22 side is the outer surface 28 of the leg portion 25 has been described, it is not necessarily limited to this. The first restricting surface facing the opposite side of the joint surface 22 in the axial direction D and in contact with the cast metal material 11 may be provided at any position of the joint tip. Further, the second restricting surface facing the joint surface 22 side in the axial direction D and in contact with the cast metal material 11 may be provided at any position of the joint tip. For example, a part of the back surface 23 may be provided on the outer side of the leg portion 25 in the direction perpendicular to the axis, and the back surface 23 may be used as the first regulating surface. Further, when the leg portion is a coil spring, the facing surfaces of the wire rods of the coil spring are the first and second restricting surfaces, respectively. Further, knurled unevenness or spike-shaped protrusions may be provided on the outer peripheral surface of the head or on the outer surface of the leg, and the surfaces formed by the unevenness or protrusions may be used as the first and second restricting surfaces, respectively.

In the above embodiment, direct spot welding is described in which the casting products 10, 47, 71 and the mating member 2 are overlapped and then welded by sandwiching them between electrodes, but it is not necessarily limited to this. do not have. It is of course possible to join the casting products 10, 47, 71 and the mating member 2 by spot welding of other methods. Other methods include an indirect method, a series method, a parallel method, and the like.

Also, the method of joining the casting products 10, 47, 71 and the mating member 2 is not limited to spot welding, and it is of course possible to join them by other resistance welding. Other resistance welding includes projection welding, pressure butt welding, flash butt welding, seam welding, and the like.

Also, the casting products 10, 47, 71 and the mating member 2 are not limited to joining by resistance welding, and the casting products 10, 47, 71 and the mating member 2 are joined by other joining means. Of course it is possible. Examples of other joining means include other welding means such as laser welding and arc welding, and joining means using plastic flow such as friction stir welding.

Reference Signs List 1, 49, 70 structure 2 mating member 10, 47, 71 cast product 11 cast metal material 14 casting part 15 outer part 20, 40, 60 joining tip 21, 61 head 22 joining surface 23 back surface 24 first regulation Face (part of regulation face)
25, 41, 62 leg portion 26 tip portion 27, 42a, 45 inner surface 28, 42b, 46 outer surface (part of regulation surface)
30a, 50a, 65 fixed type (first type)
31 cavity 33, 53 body (second die)
33d Inclined surface 34 Holding portion 48, 72 Cast metal material (injection portion)
66 movable type (second type)
A virtual axis D axis direction

Claims (10)

a joining tip having a joining surface made of iron-based metal and a restricting surface facing in an axial direction along one imaginary axis orthogonal to the joining surface;
a cast metal material made of a non-ferrous metal in which the joining tip is cast so as to be in contact with the regulation surface;
The bonding tip includes a head having a surface that is the bonding surface,
a leg projecting from the back surface of the head in the axial direction,
the leg comprises a distal end remote from the back surface;
The cast metal material has a casting part in which the joining tip is cast in a state in which the joining surface and the tip part are exposed,
A cast product in which the axial stiffness of the legs is less than the axial stiffness of the head. the legs are arranged outside in a direction perpendicular to the virtual axis;
an inner surface facing the virtual axis;
an outer surface opposite the inner surface;
2. The cast product of claim 1, wherein the inner and outer surfaces of at least a portion of the axial direction of the leg diverge from the imaginary axis toward the distal end. the leg is formed in a cylindrical shape that surrounds the virtual axis along the entire circumference,
3. The cast product of claim 2, wherein said outer surface is at least part of said regulating surface. 4. A self-piercing rivet according to claim 3, wherein said joining tip encapsulated in said casting part is formed by plastically deforming said leg of a self-piercing rivet in which said cylindrical leg protrudes from said back surface of said head. casting products. The cast metal material has an outer portion that extends outward in a direction perpendicular to the imaginary axis in the cast-injection portion,
5. A cast product according to any one of claims 1 to 4, wherein the axial thickness of the casting part is greater than the axial thickness of the outer part. A structure comprising the cast product according to any one of claims 1 to 5, and a mating member made of ferrous metal to be joined to the joint surface of the cast product. A joining tip having a joining surface made of ferrous metal and a restricting surface facing in an axial direction along one imaginary axis orthogonal to the joining surface; A method for manufacturing a cast product comprising: a cast metal stock made of metal;
With the joining tip sandwiched between the first die and the second die with which the joining surfaces are in contact, the joining tip is removed by bringing the first die and the second die closer to each other in the axial direction. a deformation step of compressively deforming in the axial direction;
A molten metal is cast into a cavity formed between the first mold and the second mold by the deformation step, and the joining tip is cast with a cast metal material formed by cooling the cast molten metal. A method of manufacturing a cast product comprising: a wrapping casting process. The bonding tip includes a head having a surface that is the bonding surface,
a leg projecting from the back surface of the head in the axial direction and arranged outside in an axis-perpendicular direction perpendicular to the virtual axis;
the legs include tip portions remote from the back surface;
an inner surface facing the virtual axis;
an outer surface opposite to the inner surface and in contact with the cast metal material after the casting process,
In the deforming step, the inner surface of at least a portion of the leg portion in the axial direction and 8. The method of manufacturing a cast product according to claim 7, wherein the leg is plastically deformed so that the outer surface moves away from the imaginary axis toward the tip. 9. The method of manufacturing a cast product according to claim 8, wherein the second die is a portion against which the leg portion is pressed by the deforming step, and has an inclined surface that slopes downward as it separates from the imaginary axis. the leg is formed in a tubular shape at least partially surrounding the virtual axis in the axial direction;
The second mold includes a holding portion inserted into the inner surface of the leg,
9. In the deforming step, after inserting the holding portion into the leg portion, the joining surface is brought into contact with the first die to bring the first die and the second die closer together in the axial direction. 10. A method for producing a cast product according to 9.

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