JP6322453B2 - Casting product, structure and method of manufacturing structure - Google Patents

Description

The present invention is cast product to be joined in a form overlap partially or entirely and the mating member, the structure was resistance welded to the mating member in the cast product, and a process for producing a structure.

  Conventionally, for example, when joining a member made of non-ferrous metal such as aluminum, magnesium, zinc, and a member made of ferrous metal (steel), when both members are joined directly by welding, they are dissimilar metals, Brittle intermetallic compounds are produced at the joint interface. As a result, it is known that the bonding strength varies greatly and the bonding reliability is low.

  Therefore, by casting a part of the ferrous metal joining material with a non-ferrous metal casting metal material, a cast product in which the cast metal material and the joining material are integrated is manufactured. Thus, there is a technique for joining a cast metal material, which is a different metal, and a mating member (Patent Document 1). The technique disclosed in Patent Document 1 will be described below with reference to FIG. 6A is a plan view of a structure in which a counterpart member 303 is joined to a conventional casting product 300, and FIG. 6B is a cross-sectional view of the structure taken along line VIb-VIb in FIG. 6A. It is.

  As shown in FIG. 6A, in the cast product 300, a flat joining material 302 is cast in a cast metal material 301. The cast metal material 301 is made of non-ferrous metal, and the joining material 302 is made of ferrous metal (steel plate). As shown in FIG. 6B, the cast metal material 301 is a plate-like member surrounded by the first surface 301a, the second surface 301b, and the end surface 301c, along the first surface 301a and the second surface 301b. A part of the bonding material 302 (steel plate) is cast, and the remaining portion of the bonding material 302 protrudes from the end surface 301c having a small thickness. By forming the nugget N at a plurality of locations (three locations in FIG. 6) between the joining material 302 and the mating member 303 by lap resistance welding, the cast metal material 301 and the mating member are interposed via the joining material 302. 303 is joined.

JP 2006-312192 A

  However, in the above-described conventional technique, since the integrated joining material 302 (steel plate) having a size in the longitudinal direction of the end surface 301c of the cast metal material 301 is cast into the cast metal material 301, the cast metal material 301 is cast after casting. Due to the shrinkage caused by cooling, a large stress is generated in the cast metal material 301 (particularly, the boundary portions A and B of the joining material 302) due to the difference in thermal expansion between the cast metal material 301 and the joining material 302. As a result, there is a problem that a large residual stress is generated. If the residual stress is large, it may cause a decrease in fracture strength when receiving external force repeatedly. Further, the cast product may be deformed by the generated stress.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a cast product , a structure, and a method of manufacturing the structure that can suppress stress.

Means for Solving the Problems and Effects of the Invention

In order to achieve this object, according to the cast product according to claim 1, there are a plurality of joining tips in which a plurality of locations and joining surfaces of the mating member are joined by resistance welding. While being dispersed in the cast metal material, at least one of the joint surfaces is exposed and encased. Since the cast metal material is composed of a metal material different from that of the counterpart member, due to the difference in thermal expansion, stress is generated in the cast metal material due to shrinkage accompanying cooling of the cast metal material after casting. However, since the plurality of joining tips dispersed and cast in the cast metal material are resistance welded to the plurality of locations of the mating member, the size of each joining tip can be made smaller than conventional joining materials. . As a result, it is possible to reduce the influence of the joining tip on the cast metal material due to the shrinkage accompanying the cooling of the cast metal material, so that the stress generated in the cast metal material can be suppressed.
In the joining chip, the joining surface that contacts the mating member is joined, and the side surface intersects the joining surface via a ridge that surrounds the joining surface. A locking portion is provided on the side surface so as to be protruded or recessed, and at least the locking portion is cast into the cast metal material, and the joining tip is cast into the cast metal material over the entire circumference of the side surface. As a result, there is an effect that the adhesion strength between the cast metal material and the joining tip can be improved.

According to the cast article of claim 2, wherein, junction chip is bonded is bonded surface in contact with the mating member, an end face on the opposite side it is provided with the joint surface. A plurality of joining tips are cast into the cast metal material with at least a part of the end face exposed. Thereby, the joining chip can be cast into the cast metal material in a state where the joining surfaces and end faces of the plurality of joining chips are held in contact with the mold for casting the cast metal material. As a result, since the joining chip can be prevented from being cast at a shifted position, in addition to the effect of the first aspect , the positional accuracy of the joining chip can be improved and the stability of the quality of the cast product can be improved.
Furthermore, since at least a part of the end face of the joining tip is exposed, the resistance welding electrode can be brought into contact with the exposed end face for resistance welding. In this case, since different materials can be prevented from being sandwiched between the resistance welding electrode and the joining tip, the barrier between the joining surface of the joining tip and the resistance welding electrode can be reduced, and high quality resistance welding is achieved. It can be performed.
A structure according to a third aspect includes the cast product according to the first or second aspect and a mating member to which the cast product is joined by resistance welding. One spot-like nugget by resistance welding is formed between the mating surface of the joining tip and the counterpart member. Thereby, since the area of a joining surface can be made small, the whole joining chip can be made small. As a result, it is possible to further reduce the influence of the joining tip on the cast metal material due to the shrinkage accompanying the cooling of the cast metal material. Therefore, in addition to the effect of claim 1 or 2, there is an effect of further suppressing the stress generated in the cast metal material. .
The method for manufacturing a structure according to claim 4 is a method for manufacturing a structure in which the cast product of claim 2 is resistance-welded to the counterpart member, and has the same effect as the cast product of claim 2 .

(A) is a top view of the structure by which the other party member was joined to the cast product in Embodiment 1 of this invention, (b) is sectional drawing of the structure in the Ib-Ib line | wire of FIG. (C) is a perspective view of a joining chip. (A) is sectional drawing of the mold for casting which the joining chip | tip was set, (b) is sectional drawing of the cast product with which the other party member was joined. (A) is sectional drawing of the mold for casting which the joining chip | tip was set, (b) is sectional drawing of the cast product in 2nd Embodiment with which the other party member was joined. (A) is sectional drawing of the mold for casting which the joining chip | tip was set, (b) is sectional drawing of the casting product in 3rd Embodiment with which the other party member was joined. (A) is sectional drawing of the casting product in 4th Embodiment, (b) is sectional drawing of the casting product in 5th Embodiment, (c) is sectional drawing of the casting product in 6th Embodiment. It is a figure, (d) is sectional drawing of the cast product in 7th Embodiment, (e) is sectional drawing of the cast product in 8th Embodiment, (f) is in 9th Embodiment. It is sectional drawing of a cast product. (A) is a top view of the structure by which the other party member was joined to the conventional casting product, (b) is sectional drawing of the structure in the VIb-VIb line | wire of Fig.6 (a).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a structure A in which a mating member 3 is joined to a cast product 1 according to the first embodiment of the present invention, and FIG. 1B is a structure A taken along line Ib-Ib in FIG. FIG. 1C is a perspective view of the bonding chip 10.

  As shown in FIGS. 1 (a) and 1 (b), in the cast product 1, a plurality (four in this embodiment) of joining chips 10 are cast in a cast metal material 2. The cast metal material 2 is made of non-ferrous metal, and the joining chip 10 is a metal material different from the cast metal material 2 and is made of the same kind or the same type of metal material as the counterpart member 3. In the present embodiment, the cast metal material 2 is made of aluminum or an aluminum alloy, and the mating member 3 and the joining tip 10 are made of an iron-based metal.

  The joining chip 10 includes a main body part 11 and a locking part 12 protruding from the main body part 11, and these are integrally formed. The locking portion 12 is surrounded by the cast metal material 2, and a part of the main body portion 11 is exposed from the first surface 2 a of the cast metal material 2 facing the mating member 3 to be joined. A nugget N is formed between the main body 11 of the joining tip 10 and the counterpart member 3 by lap resistance welding.

  As shown in FIG. 1C, the joining chip 10 has a main body portion 11 formed in a rod shape (columnar shape in the present embodiment), and a locking portion 12 extending from one end in the axial direction of the main body portion 11 to the entire circumference. And projecting in a flange shape (annular shape) outward in the radial direction. The main body part 11 is in contact with the mating member 3 and forms a nugget N (see FIG. 1B) at the interface, and a side surface 11c that intersects the joint surface 11a via a ridge 11b that surrounds the joint surface 11a. And. The side surface 11 c is a surface surrounded by the cast metal material 2, and the locking portion 12 is a portion provided between the first surface 2 a and the second surface 2 b of the cast metal material 2. The latching | locking part 12 restrains the joining chip | tip 10 so that it cannot move to an axial direction (FIG.1 (b) left-right direction) by being surrounded by the cast metal material 2. FIG. Therefore, the adhesion strength of the joining chip 10 to the cast metal material 2 can be secured by the locking portion 12.

  In addition, as for the latching | locking part 12, it is preferable that chamfering processes, such as C chamfering and R chamfering, are given to the edge of the latching | locking part 12 (flange). This is to suppress local concentration of stress generated in the cast metal material 2 around the locking portion 12.

  Next, a method for manufacturing the cast product 1 and a method for joining the cast product 1 will be described with reference to FIG. 2A is a cross-sectional view of the casting mold B1 in which the joining chip 10 is set, and FIG. 2B is a cross-sectional view of the cast product 1 to which the mating member 3 is joined.

  As shown in FIG. 2 (a), the casting mold B1 is a die-casting mold configured to cast a non-ferrous molten metal such as an aluminum alloy, a magnesium alloy, or a zinc alloy. And a movable die 5 that can be clamped and opened with respect to the fixed die 4. A cavity 5 a is formed by clamping the movable mold 5 to the fixed mold 4. In the fixed mold 4, holding parts 4 a into which the main body part 11 (joining surface 11 a side) of the joining chip 10 is inserted are recessed at a plurality of locations. The holding part 4a is a part for holding the joining chip 10 in the cavity 5a, so that the movable mold 5 clamped to the fixed mold 4 does not contact the joining chip 10 held by the holding part 4a. The length of the joining chip 10 (main body part 11) with respect to the thickness direction of the cavity 5a (FIG. 2 (a) left-right direction) is set. Of course, the holding portion 4a can be provided on the movable mold 5 side.

  The plurality of joining chips 10 that are locked to the plurality of holding portions 4a are respectively set to the same shape and size. The joining chip 10 is set in the casting mold B1 using a carry-in device (not shown) such as a robot hand. Since the joining chips 10 are set to the same shape and size, the joining chip 10 is set. A component (not shown) for gripping and setting in the casting mold B1 can be easily shared or standardized. After setting the joining chip 10 to the casting mold B1 by a carry-in device (not shown), the molten metal is cast into the cavity 5a, so that the side surface 11c and the locking portion 12 (FIG. c)) is produced by casting the cast metal material 2 (cooled molten metal). As for the joining chip | tip 10, a part (at least one surface) of the main-body part 11 by the side of the joining surface 11a (refer FIG.1 (c)) is exposed to several places of the 1st surface 2a of the cast metal material 2, and the joining surface 11a side is exposed. The remainder other than is wrapped in the cast metal material 2.

  Here, in the prior art (see FIG. 6B), when the cast product 300 is manufactured by casting a flat joining material 302 (steel plate) into the cast metal material 301, the first surface 301a of the cast metal material 301 and Since the bonding material 302 needs to be along the second surface 301 b, the bonding material 302 protrudes from the end surface 301 c of the cast metal material 301. For this reason, the position of the bonding material 302 is restricted, and the degree of freedom in designing the bonding material 302 is reduced. Further, since the joining material 302 is placed along the first surface 301a and the second surface 301b of the cast metal material 301, the thickness of the cast metal material 301 (FIG. 6B, left and right direction) cannot be increased. The mechanical strength of the cast metal material 301 is reduced.

  Further, in the casting mold (not shown) of the cast product 300, it is necessary to dispose a degassing part (not shown) at the time of casting on the end surface 301c of the cast metal material 301, but the end surface 301c is joined to the end surface 301c. Since the working material 302 is disposed, it is difficult to dispose the gas vent portion. In addition, when the cast product 300 is manufactured, the joining material 302 must be individually prepared according to the shape, size, and the like of the cast metal material 301. Therefore, the creation and inventory management of the joining material 302 are complicated. Turn into.

  On the other hand, according to the present embodiment, the joining surface 11a (see FIG. 1C) of the joining tip 10 is not limited to the end surface 2c of the cast metal material 2 (see FIG. 1B), but is also a cast metal material. 2 can be exposed to a plurality of locations on the first surface 2a of the second metal, so that the degree of freedom in designing the joining chip 10 on the cast metal material 2 can be improved. Therefore, the casting metal material 2 and the counterpart member 3 can be overlapped so that the first surface 2a of the cast metal material 2 faces the counterpart member 3, and the joining tip 10 and the counterpart member 3 can be joined by resistance welding. . Moreover, since the joining chip | tip 10 can be cast in places other than the end surface 2c of the cast metal material 2, while improving the freedom degree of arrangement | positioning, such as a vent part provided in the casting mold B1, and an overflow, the other party side The part which can join the cast metal material 2 to the member 3 can be expanded.

  Furthermore, by setting the joining chip 10 to the same shape and size, it is unnecessary to prepare various joining chips according to the shape and size of the cast metal material 2 and the counterpart member 3. As a result, regardless of the shape of the cast metal material 2 and the counterpart member 3, the joining chip 10 can be generalized (made into a common part), and inventory management of the joining chip 10 can be facilitated.

  As shown in FIG. 2B, when the cast product 1 is joined to the mating member 3, the mating member 3 is overlapped with the cast metal material 2, and the joining surface 11a of the joining chip 10 (see FIG. 1C) is used. Contact the mating member 3. Next, the tip surface of the electrode 6 for spot welding is pressed against the cast metal material 2 and the counterpart member 3 and energized to form one nugget N (joint portion) for each joint tip 10. By forming the nugget N for each joining chip 10, a plurality of locations of the mating member 3 and the cast metal material 2 are joined via the joining chip 10.

  Here, since the cast metal material 2 is made of a metal material different from the counterpart member 3, due to the difference in thermal expansion, the cast metal material 2 is contracted by cooling the cast metal material 2 after casting. Stress is generated in the cast metal material 3. However, since the plurality of joining chips 10 dispersed and cast in the cast metal material 2 are joined to a plurality of locations of the counterpart member 3, respectively, the size of each joining chip 10 is conventionally (Patent Document 1). It can be made smaller than the bonding material.

  As a result, it is possible to reduce the influence of the joining tip 10 on the cast metal material 2 due to the shrinkage accompanying the cooling of the cast metal material 2. That is, the stress generated in the cast metal material 2 can be suppressed. As a result, it is possible to suppress residual stress and suppress a decrease in fracture strength when an external force is repeatedly applied. In addition, deformation of the cast product caused by stress can be suppressed.

  Furthermore, since the size of each joining tip 10 can be reduced as compared with the conventional joining material (Patent Document 1), the heat generated by heat input during welding (joining) compared to the conventional (Patent Document 1). The influence of expansion can be reduced. As a result, the deformation of the cast product 1 due to heat input can be suppressed.

  Preferably, each joining tip 10 is spot-welded with the counterpart member 3 at one location. In that case, compared with the case where each joining tip 10 is spot-welded with the counterpart member 3 at a plurality of locations, the area of the distal end surface 11a of the joining tip 10 can be reduced. Accordingly, the entire joining chip 10 including the main body portion 11 and the locking portion 12 can be made smaller, so that the stress generated in the cast metal material 2 can be further suppressed.

  Note that the size of the tip surface 11a of the joining tip 10 depends on the shape of the tip surface of the electrode 6 when the mating member 3 and the joining tip 10 are joined at one place by spot welding. It is set to be the same as the tip diameter or slightly larger than the tip diameter. This is because the tip diameter of the electrode 6 substantially coincides with the maximum nugget diameter that can be obtained, and the bonding strength can be ensured by determining the size of the tip surface 11 a of the joining tip 10 based on the tip diameter of the electrode 6. Moreover, since the main-body part 11 is formed in a column shape and the latching | locking part 12 is formed in an annular | circular shape, the stress which generate | occur | produces in the cast metal material 2 around the main-body part 11 and the latching | locking part 12 is locally. Concentration can be suppressed.

  In addition, since the main-body part 11 (refer FIG.1 (c)) protrudes from the 1st surface 2a of the casting metal material 2, the joining surface 10 of the joining chip | tip 10 and the other party member 3 are joined. When this occurs, a gap equal to the protruding amount of the main body 11 is formed between the counterpart member 3 and the cast metal material 2. When the structure A in which the cast metal material 2 and the mating member 3 are joined is used in an environment where the cast metal material 2 and the mating member 3 are exposed to rainwater, the joining chip 10 causes the mating member 3 and the cast metal material 2 to be interposed between them. A gap is provided, and a sealing material such as a filler or a gasket can be sandwiched between the gaps. As a result, it is possible to prevent moisture from entering the seal material (on the side of the bonded chip 10) and to prevent electrolytic corrosion. Moreover, since the joining surface 11a is exposed from the cast metal material 2, the cast metal material 2 and the mating member 3 of the same material can be joined without interposing a different material such as a non-ferrous metal. As a result, high-quality resistance welding can be performed.

  Moreover, when casting the joining chip 10 as compared with the case of casting the conventional joining material 302 (steel plate, see FIG. 6A), the main body 11 of the joining chip 10 (see FIG. 1C). ), The opening length of the cast metal material 2 formed around can be reduced. Thereby, it can suppress that the mechanical strength of the cast metal material 2 falls by the opening formed by cast-in.

  Since the joint chip 10 is surrounded by the cast metal material 2 because the side surface 11c and the engaging portion 12 intersecting the joint surface 11a via the ridge 11b surrounding the joint surface 11a (see FIG. 1C), the cast metal material 2 In addition, the holding strength for holding the bonding chip 10 can be secured. Moreover, since the joining chip | tip 10 is a magnitude | size which can be joined to the other party member 3 in each one place, the volume of the casting metal material 2 can be made relatively large, and it is because the joining chip | tip 10 was cast. A decrease in mechanical strength of the cast metal material 2 can be suppressed.

  Furthermore, since the volume of the joining tip 10 can be made relatively small as compared with the volume of the cast metal material 2, the joining tip 10 can be arranged relatively freely on the casting metal material 2. As a result, the degree of freedom in shape design (rib formation, etc.) of the cast metal material 2 can be improved. Moreover, the stress which generate | occur | produces in the casting metal material 2 can be suppressed by disperse | distributing and arrange | positioning the some joining chip | tip 10 relatively small with respect to the casting metal material 2 in the casting metal material 2 in the state which mutually spaced apart.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, a part of main-body part 11 by the side of the joint surface 11a (refer FIG.1 (c)) of the joining chip | tip 10 is exposed to the 1st surface 2a of the cast metal material 2, and other than the joint surface 11a side. The case where the remaining portion is wrapped in the cast metal material 2 has been described. On the other hand, in the second embodiment, a part of the main body portion 11 on the side of the joint surface 11a (see FIG. 1C) of the joint chip 10 is exposed to the first surface 2a of the cast metal material 2. In addition, a case where a part of the main body 11 (a surface located opposite to the bonding surface 11a) is exposed to the second surface 2b side will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. 3A is a cross-sectional view of the casting mold B2 on which the joining chip 10 is set, and FIG. 3B is a cross-sectional view of the casting product 21 in the second embodiment in which the mating member 3 is joined. FIG.

  As shown in FIG. 3A, the casting mold B <b> 2 is a die-casting mold configured to cast a nonferrous metal molten metal, and can be clamped and opened with respect to the fixed mold 4. A contact portion 7 is provided on the movable mold 5. When the movable mold 5 is clamped to the fixed mold 4, the abutting section 7 is an end surface 11 d (see FIG. 3B) of the main body portion 11 of the joining chip 10 that is locked to the holding section 4 a of the fixed mold 4. ) To hold the bonded tip 10 between the fixed die 4 and the contact portion 7. The contact portion 7 is set so that the tip diameter is smaller than the tip diameter of the electrode 6.

  After the movable mold 5 is clamped with respect to the fixed mold 4 and the bonded chip 10 is pressed and held between the fixed mold 4 and the contact portion 7, molten metal is cast into the cavity 5a. A cast product 21 in which the side surface 11c of 10 (see FIG. 1C) and the locking portion 12 are cast into the cast metal material 2 is manufactured. In the cast metal material 2, the abutting portion 7 forms a hole 22 in which a part of the end surface 11 d of the main body 11 is exposed.

  Since the cast product 21 is manufactured as described above, the joining chip 10 can be held in pressure contact between the fixed mold 4 and the movable mold 5 at the time of casting. As a result, it is possible to prevent the joining chip 10 from being cast at a position shifted by the molten metal cast into the cavity 5a. On the other hand, when manufacturing the conventional cast product 300 (refer FIG.6 (b)), the raw material 302 (steel plate) for joining arrange | positioned at the casting mold (not shown) of the cast product 300 is cast. In some cases, the molten metal is squeezed by the molten metal and is cast in the cast metal material 301. According to the present embodiment, this can be prevented, the positional accuracy of the joining tip 10 can be improved, and the quality stability of the cast product 21 can be improved.

  Next, a third embodiment will be described with reference to FIG. In the second embodiment, a case has been described in which the bonding tip 10 is pressed and held between the fixed mold 4 and the movable mold 5 by using the contact portion 7 whose tip diameter is set smaller than the tip diameter of the electrode 6. . On the other hand, in the third embodiment, the bonded tip 10 is held in pressure contact between the fixed die 4 and the movable die 5 by using the contact portion 8 whose tip diameter is set larger than the tip diameter of the electrode 6. Will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 4A is a cross-sectional view of a casting mold B3 in which the joining chip 10 is set, and FIG. 4B is a cross-sectional view of the cast product 31 in the third embodiment in which the mating member 3 is joined. FIG.

  As shown in FIG. 4A, the cast-in mold B3 is a die-cast mold in which a contact portion 8 is provided on a movable mold 5 that can be clamped and opened with respect to the fixed mold 4. When the movable mold 5 is clamped to the fixed mold 4, the abutting section 8 is an end surface 11 d of the main body 11 of the joint chip 10 that is locked to the holding section 4 a of the fixed mold 4 (see FIG. 4B). ) To hold the bonded tip 10 between the fixed die 4 and the contact portion 7. The abutting portion 8 has a tip diameter larger than the tip diameter of the electrode 6 and is formed in a truncated cone shape whose diameter increases from the tip side toward the base end side.

  After the movable mold 5 is clamped with respect to the fixed mold 4 and the bonded chip 10 is pressed and held between the fixed mold 4 and the contact portion 8, the molten metal is cast into the cavity 5a, whereby the bonded chip A casting product 31 in which the side surface 11c of 10 (see FIG. 1C) and the locking portion 12 are cast in the cast metal material 2 is manufactured. In the cast metal material 2, a mortar-shaped hole 32 in which a part of the end surface 11 d of the main body 11 is exposed is formed by the contact portion 8.

  Since the casting product 31 is manufactured as described above, the joining chip 10 is held in pressure contact between the fixed mold 4 and the movable mold 5 at the time of casting, and the joining chip 10 is cast in a shifted position. Can be prevented. Further, when resistance welding is performed, one electrode 6 can be inserted into the hole 32 and the tip surface of the electrode 6 can be brought into contact with the end surface 11 d of the main body 11 of the bonding tip 10. Since different materials such as non-ferrous metals can be prevented from being sandwiched between the electrode 6 and the bonding tip 10, the barrier between the bonding surface 11 a (see FIG. 1C) of the bonding tip 10 and the electrode 6 can be reduced. And high-quality resistance welding can be performed.

  Next, another embodiment will be described with reference to FIG. FIG. 5A is a cross-sectional view of a cast product 41 in the fourth embodiment, FIG. 5B is a cross-sectional view of a cast product 61 in the fifth embodiment, and FIG. FIG. 5D is a cross-sectional view of a cast product 91 according to the seventh embodiment, and FIG. 5E is a cross-sectional view of the cast product 111 according to the eighth embodiment. FIG. 5F is a cross-sectional view of a cast product 121 according to the ninth embodiment. In the fourth to ninth embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and the following description is omitted. Further, in FIGS. 5A to 5F, illustration of a part of the cast metal materials 2 and 72 and the counterpart member 3 is omitted.

  As shown in FIG. 5A, in the cast product 41, the joining tip 50 is cast in the cast metal material 2. The joining chip 50 has a bowl-shaped recess 51 that is reduced in diameter toward the end face 11d side of the main body 11 at the approximate center of the joining surface 11a (the surface that contacts the mating member 3, see FIG. 1C). Is recessed. The recessed part 51 is a part for reducing the area of the joint surface 11a. The joining chip 50 set in the casting mold (not shown) has a contact portion (not shown) provided in the casting mold pressed against the end surface 11d of the main body 11, It is fixed to the mold for casting. A hole 42 is formed in the cast metal material 2 by casting the molten metal in a state in which a contact portion (not shown) is pressed against the end surface 11d. The joining chip 50 is formed with a recessed part 51 in the main body part 11 to reduce the area of the joining surface 11a, and the periphery of the recessed part 51 is projected, so that the projecting joining surface 11a is used. It is suitable for joining the joining tip 50 and the counterpart member 3 by projection welding.

  As shown in FIG. 5B, in the cast product 61, the joining tip 50 is cast in the cast metal material 2. The cast metal material 2 is provided with a covering portion 62 that wraps around the side surface 11 c (see FIG. 1C) of the main body portion 11 of the joining tip 50. The covering portion 62 contacts the mating member 3 when the cast product 61 is joined to the mating member 3. The cast product 61 is suitable when a part of the cast metal material 2 (the covering portion 62) needs to contact the counterpart member 3.

  As shown in FIG. 5C, in the cast product 71, the joining chip 80 is cast in a cast metal material 72. The joining chip 80 is a member integrally formed of an iron-based metal material, and is a rod-shaped main body whose axial length is set to be equal to the thickness of the cast metal material 72 (FIG. 5 (c) horizontal dimension). A portion 81 and a locking portion 82 that protrudes radially outward from the substantially center in the axial direction of the main body 81 and is formed in a bowl shape. The joining chip 80 is held by a casting mold (not shown) with the main body 81 being pressed in the axial direction between a fixed mold and a movable mold (both not shown). Since the joining chip 80 has the engaging portion 82 surrounded by the cast metal material 72, the joining chip 80 can be prevented from falling off the cast metal material 72.

  As shown in FIG. 5 (d), in the cast product 91, the joining chip 100 is cast in the cast metal material 2. The joining chip 100 is a member integrally formed of an iron-based metal material, and a locking portion 102 formed of a knurled unevenness or spike-like protrusion is formed on the side surface of the main body 101 formed in a rod shape. ing. The joining chip 100 set in the casting mold (not shown) has a contact portion (not shown) provided in the casting mold pressed against the end surface of the main body 101, thereby casting the casting chip 100. The hole 92 is formed in the cast metal material 2 by being fixed to the wrapping mold and casting the molten metal in that state. The joining chip 100 can be prevented from dropping from the cast metal material 2 due to the anchor effect of the locking portion 102.

  In addition, the joining chip 100 (see FIG. 5D) has a bowl-shaped recessed portion 103 formed in the approximate center of the joining surface 11 a (main body portion 101) that contacts the counterpart member 3. Since the joint chip 100 is formed with the concave part 103 in the main body part 101 and the periphery of the concave part 103 has a convex shape, the joint chip 100 and the mating member 3 are formed using the convex coupling surface 11a. Is suitable for joining by projection welding.

  As shown in FIG. 5 (e), in the cast product 111, the joining chip 100 is cast in the cast metal material 2. The cast metal material 2 is provided with a covering portion 112 that wraps around the side surface of the main body portion 101 of the joining chip 100. The covering portion 112 contacts the mating member 3 when the cast product 111 is joined to the mating member 3. The cast product 111 is suitable when a part of the cast metal material 2 (the covering portion 112) needs to contact the counterpart member 3.

  As shown in FIG. 5 (f), in the cast product 121, the joining tip 130 is cast in a cast metal material 72. The joining chip 130 is a member integrally formed of an iron-based metal material, and is a rod-shaped main body whose axial length is set to be equal to the thickness of the cast metal material 72 (FIG. 5 (f) horizontal dimension). On the side surface of the portion 131, a locking portion 132 made of knurled irregularities or spike-like protrusions is formed. The joining chip 130 is held by a cast-in mold (not shown) with the main body 131 pressed against the fixed mold and the movable mold (both not shown) in the axial direction. The joining tip 130 can be prevented from dropping from the cast metal material 72 due to the anchor effect of the locking portion 132.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, in the first embodiment, the case where the four joining chips 10 are embedded at equal intervals in the cast metal material 2 has been described. However, the present invention is not limited to this, and the number and interval of embedding the joining chips 10 are as follows. It can be set as appropriate in relation to the cast metal material 2 and the counterpart member 3.

  Moreover, although 1st Embodiment demonstrated the case where the some joining chip | tip 10 was arranged in a line in the cast metal material 2, it is not necessarily restricted to this, The cast metal material 2, the other party member 3, and joining Of course, it is possible to arrange a plurality of bonded chips 10 in a two-dimensional or three-dimensional shape such as a lattice shape or a staggered shape according to the shape or size of the chip 10.

  Moreover, although the case where each joining chip | tip 10 was set to the same shape and magnitude | size was demonstrated, it is not necessarily restricted to this, According to the magnitude | size, shape, etc. of the cast metal material 2 or the other party member 3, Of course, it is possible to set to different shapes and sizes.

  In each of the above embodiments, the case where the bonding surface 11a of each bonding chip 10, 50, 80, 100, 130 is a plane has been described. However, the present invention is not necessarily limited to this, and in relation to the counterpart member 3, It is naturally possible to form the joining surface in a curved surface shape or a polyhedron shape. Even when the joining surface is formed in a polyhedral shape, the joining surface can be brought into contact with the mating member 3 and joined to the mating member 3 as long as at least one surface is exposed from the cast metal material.

  In the first to fifth embodiments, the case where the main body portion 11 of the joining chips 10 and 50 is formed in a columnar shape has been described. However, the present invention is not necessarily limited to this, and the main body portion 11 is elliptical. Of course, it is possible to make it columnar or polygonal. Moreover, although the case where the latching | locking part 12 of the joining chip | tips 10 and 50 was formed in the annular | circular shape was demonstrated, it is not necessarily restricted to this, Various shapes, such as an elliptical shape and a polygonal shape, see axially. Of course it is possible.

  Further, the engaging portion 12 is not limited to the convex portion provided on the main body portion 11, and the engaging portion 12 can naturally be concavely provided on the side surface 11 c of the main body portion 11. It is because it can prevent that joining chip | tips 10 and 50 fall out from the cast metal material 2 because the cast metal material 2 approachs into the latching | locking part 12. FIG.

  Further, in the first to sixth embodiments, the case where one flange-like locking portion 12, 82 is provided in the main body 11, 81 is not necessarily limited to this. Of course, it is possible to provide a plurality of engaging portions (flanges) at intervals in the axial direction of the main body portions 11 and 81.

  In the first to sixth embodiments, the case where the flange-like locking portions 12 and 82 are formed in series (continuously) over the circumferential direction of the main body portions 11 and 81 will be described. However, it is not necessarily limited to this. Naturally, the locking portions 12 and 82 (protrusions) can be provided intermittently along the circumferential direction of the main body portions 11 and 81 or at one or a plurality of locations on the side surface 11 c of the main body portion 11. Also in this case, it is possible to prevent the joining tips 50 and 80 from moving in the axial direction and dropping off from the cast metal materials 2 and 72 by the locking portion.

  In the first to third embodiments, the joining chip 10 is fixed to the fixed mold 4 of the casting molds B1, B2, and B3, and the movable mold 5 is clamped to the fixed mold 4. Although the case has been described, the present invention is not necessarily limited to this, and it is naturally possible to fix the joining chip 10 to the movable die 5.

  In the seventh embodiment (see FIG. 5D) and the ninth embodiment (see FIG. 5F), the locking portions 102 and 132 formed in a knurled shape or the like are the main body portions 101 and 131, respectively. Although the case where it was surrounded by the cast metal materials 2 and 72 over the axial direction of this was demonstrated, it is not necessarily restricted to this. The locking parts 102, 132 allow the joining tips 100, 130 to fall off from the cast metal material 2, 72 if a part of the main body parts 101, 131 in the axial direction is encased in the cast metal material 2, 72. This is because it can be prevented.

  In the seventh embodiment (see FIG. 5 (d)) and the ninth embodiment (see FIG. 5 (f)), the locking portions 102 and 132 formed in a knurled shape or the like are provided on the main body 101. , 131 has been described as being formed in a part of the axial direction, but is not necessarily limited thereto. Naturally, it is possible to provide the locking portions 102 and 132 over the entire length of the main body portions 101 and 131 in the axial direction. In that case, it is not necessary to cast the entire axial length of the locking portions 102 and 132 with the cast metal material 2 and 72 (part of the locking portions 102 and 132 are exposed from the cast metal material 2). Is also good). This is because if the locking portions 102 and 132 are partially encased in the axial direction, the joining chips 100 and 130 can be prevented from falling off from the cast metal materials 2 and 72.

  In the first to third embodiments, direct spot welding is performed in which the cast products 1, 21, 31 and the counterpart member 3 are overlapped and then welded so as to be sandwiched between the electrodes 6. Although it demonstrated, it is not necessarily restricted to this, Of course, it is possible to join the casting products 1,21,31 and the other party member 3 by spot welding of another system. Examples of other methods include an indirect method, a series method, and a parallel method.

  Moreover, it does not limit to what joins casting products 1,21,31 and the other party member 3 by spot welding, It is naturally possible to join them by other resistance welding. Examples of other resistance welding include projection welding, pressure butt welding, flash butt welding, and seam welding.

  In each of the above embodiments, the case where the nugget N obtained by melting and solidifying the bonding interface between the bonding tip and the counterpart member 3 is formed in the bonding portion is described. However, the bonding interface does not necessarily need to be melted and solidified. Of course, it is possible to join the joining tip and the counterpart member 3 (without forming the nugget N) by phase joining (joining part).

  Moreover, although each said embodiment demonstrated each case where each joining chip | tip 10, 50, 80, 100, 130 was joined to the other party member 3 by one place by lap welding, it is not necessarily restricted to this. Absent. By setting the area of the bonding surface of each bonding chip 10, 50, 80, 100, 130 to a multiple of the area of the tip of the electrode, the bonding surface of each bonding chip 10, 50, 80, 100, 130 is placed on the mating surface. It is naturally possible to provide a plurality of joints to which the side member 3 is joined.

  Moreover, in each said embodiment, the case where the other party member 3 and the casting products 1,21,31 were joined by resistance welding was demonstrated. However, the joining means is not limited to resistance welding. Of course, it is possible to join the cast products 1, 21 and 31 to the mating member 3 by other joining means. 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.

  In each of the above embodiments, the case where a spot-like (dot-like) joint is formed between the cast products 1, 21, 31 and the counterpart member 3 by lap welding has been described. It is not limited, and it is naturally possible to form a linear or annular joint by laser welding, seam welding, friction stir welding, or the like.

  In the said embodiment, when joining a cast product and the other party member by resistance welding, it is preferable to make the joining surface of a joining chip | tip into the magnitude | size about 1 nugget (about the front end surface of an electrode). explained. However, when the cast product and the counterpart member are joined by laser welding, arc welding, or the like, the joining surface of the joining tip can be made as large as the molten pool to be formed. Further, when the cast product and the mating member are joined by friction stir welding, it is preferable that the joining surface of the joining tip has a size approximately equal to the shoulder diameter of the rotary tool. Both are for reducing the stress caused by the difference in thermal expansion between the joining tip and the cast metal material.

1,21,31,41,61,71,91,111,121 Cast product 2,72 Cast metal material 3 Mating member 5a Cavity 6 Electrode (resistance welding electrode)
10, 50, 80, 100, 130 Joined chip 11a Joined surface 11b Ridge 11c Side surface 11d End surface 12, 82, 102, 132 Locking part A Structure B1, B2, B3 Casting mold (mold)
N Nugget

Claims (4)

In casting products to be joined with the mating member,
A plurality of joining tips joined by resistance welding at each joint surface of the mating member and a plurality of joint members; and
The mating member is composed of a metal material different from each other, and includes a cast metal material in which the plurality of joining chips are dispersed and at least one of the joining surfaces is exposed and cast.
The bonding tip is a bonding surface to be bonded in contact with the mating member;
A side surface that intersects the joint surface via a ridge surrounding the joint surface;
A locking portion that is convex or concave on the side surface,
A cast product characterized in that at least the locking portion is cast into the cast metal material, and the joining tip is cast into the cast metal material over the entire circumference of the side surface . The bonding tip includes an end surface provided on the side opposite to the bonding surface,
2. The cast product according to claim 1 , wherein the cast metal material is formed by casting at least a part of the end surface and casting the plurality of the joining chips . 3. A structure comprising the cast product according to claim 1 and the counterpart member to which the cast product is joined by resistance welding,
On the joint surface of the joint tip, one point-like nugget is formed by resistance welding between the mating member,
A size of the joining surface is set according to a maximum diameter of the nugget. A method for producing a structure for producing a structure obtained by resistance welding the cast product of claim 2 to the counterpart member,
A holding step of holding a plurality of the joining chips in a cavity of the mold by bringing the joining surfaces and the end faces of the joining chips into contact with the mold, respectively;
The molten metal is cast into the cavity in a state where the bonded chip is held by the holding step, and the molten metal that has been cast is cooled, and a plurality of the bonded chips are cast with the cast metal material. A casting process for producing a cast product;
The resistance welding electrode is brought into contact with the mating member and the end surface in a state where the mating surfaces of the plurality of the joining tips exposed from the cast product manufactured by the casting process are in contact with the mating member. And a joining step of joining the mating member and the plurality of joining tips, respectively, by resistance welding to be energized.

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