JP2012035279A - Method and device for joining metal member by caulking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for joining a metal member by caulking, capable of ensuring sufficient conduction to improve reliability when applied to electric connection by more surely joining the metal member.SOLUTION: A pressing recess 21a of a punch 21 is constituted of a center pressing portion 21b and a peripheral pressing portion 21c. The metal members 4, 5 clamped between a second die 12 and a pressing plate 22 are pressed by the center pressing portion 21b and the pressing recess 13, and then, the peripheral portions of the metal members 4, 5 which are pressed by the center pressing portion 21b are further pressed by the peripheral pressing portion 21c and are joined.

Description

  The present invention relates to a caulking joining method for metal members and a caulking joining apparatus for metal members.

  Conventionally, as one method for joining a plurality of metal members, there is a mechanical joining method such as caulking joining. As an example of this joining method, for example, two plate-like metal members are stacked and held on a concave jig (die), and a metal member is used by using a convex jig (punch) facing the concave jig. A predetermined portion is pressed from the upper surface of the. As a result, the two metal members overlapped are joined by plastic deformation of the pressed joining portion following the uneven shape of the jig, and deforming so as to mesh with each other (for example, Patent Document 1). reference).

  FIG. 4 shows an example of a state in which two metal members 51 and 52 are pressed and joined by a jig. Although not shown, the tip of the convex jig has, for example, a pressing convex portion that protrudes in a cylindrical shape, and the concave jig has a pressing concave portion that has a cylindrical concave shape, for example. By moving the jig to the concave concave jig on the lower side, a shape in which the joint portion 53 of the two metal members 51 and 52 is extruded from the upper surface downward to the bottomed cylindrical shape following the uneven shape of the jig. Make. And it deform | transforms so that the boundary of the metallic members 51 and 52 may meander from the cylindrical part 54 of the joining part 53 which makes the bottomed cylindrical shape toward the bottom part 55, and it latches in the axial direction (pressing direction) of a cylinder. As a result of the locking portions 56 being formed, they are joined so as not to be separated from each other.

JP 2005-288525 A

  However, in the joint portion 53 of the metal members 51 and 52, a gap 58 is generated at the boundary between the metal members 51 and 52 at the base end portion 57 of the cylinder where the meandering deformation starts. This can be inferred from not receiving sufficient pressing force from the jig side even though it is a relatively abruptly bent portion, and is due to the elastic restoring force of the metal members 51 and 52 themselves, the so-called springback phenomenon. It is believed that there is.

  Therefore, when such a caulking joining method is used, for example, for joining terminals of an electronic component, there is a possibility that a gap generated in the joining portion of the metal member may hinder securing a sufficient conduction state. In addition, taking into account the gap, it is possible to take measures to make the joint part large enough to be in a conductive state, but it is difficult to enlarge the joint part with terminals of small parts of electronic parts. It is required to be securely joined in the interior.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to more reliably join metal members and ensure sufficient conduction when applied to electrical connection, improving reliability. An object of the present invention is to provide a caulking joining method for metal members and a caulking joining apparatus for metal members.

  In order to solve the above-mentioned problem, the invention according to claim 1 uses a first mold having a pressing recess and a second mold having a punch having a pressing projection opposed to the pressing recess. The metal members are stacked and held between the two molds, and a part of the metal member is pressed from the pressing convex portion toward the pressing concave portion by the operation of the punch. It is a method of caulking and joining metal members that are joined to each other by deforming the part following the shape of the pressing convex part and the pressing concave part, and the pressing convex part of the punch is provided at the center Using the first pressing convex portion and a second pressing convex portion that is provided adjacent to the radially outer position of the first pressing convex portion and is shorter than the first pressing convex portion, the metal While pressing a part of the member with the first pressing convex portion, As its gist in that to perform the crimped by pressing with the second pressing protrusion pressing the peripheral portion 1 pushing projection.

  In this invention, the pressing convex portion of the punch is provided adjacent to the first pressing convex portion provided in the center and the radially outer position of the first pressing convex portion and is shorter than the first pressing convex portion. It is comprised with a 2nd pressurization convex part. In the joining operation, a part of the plurality of superimposed metal members is pressed by the first pressing convex portion of the pressing convex portion, and the peripheral portion pressed by the first pressing convex portion is the second pressing convex portion. It is pressed and caulking is performed. Accordingly, the peripheral portion of the metal member pressed by the first pressing convex portion, that is, the portion where the boundary between the metal members is bent sharply, the portion where a gap due to springback or the like is likely to occur is adjacent to the first pressing convex portion. Sufficient pressing is received by the second pressing projection provided. Further, since the bent shape of the boundary between the metal members is slightly loosened by the pressing of the second pressing convex portion, the gap generated between the metal members due to the spring back or the like is suppressed to be extremely small. As a result, joining between metal members becomes more reliable, and when applied to electrical connection, sufficient conduction can be ensured and reliability can be improved.

  According to a second aspect of the present invention, in the caulking and joining method of the metal member according to the first aspect, the second pressing convex portion is provided around the first pressing convex portion, and the second pressing convex portion of the metal member is The gist is that the peripheral portion pressed by the one pressing convex portion is annularly pressed using the second pressing convex portion.

  In this invention, the 2nd press convex part provided in the periphery of the 1st press convex part presses the peripheral part pressed by the 1st press convex part in a metal member cyclically | annularly. Therefore, the peripheral part of the metal member pressed by the 1st press convex part is mutually joined in the whole circumferential direction, and a more reliable joining state can be anticipated.

  The invention according to claim 3 is the method for caulking and joining metal members according to claim 1 or 2, wherein the second pressing protrusion is provided integrally with the first pressing protrusion on the punch, The gist is that pressing by the first and second pressing protrusions is performed by one operation of the punch.

  In the present invention, the punch is provided with the second pressing convex portion integrally with the first pressing convex portion, and pressing by the first and second pressing convex portions is performed by one operation of the punch. As a result, the structure of the punch itself, the structure of the mechanism for operating the punch, and the like can be simplified, and the pressing by the first and second pressing protrusions can be performed by one operation of the punch, so that the bonding processing time is short. That's it.

  Invention of Claim 4 is the joining process clamped between the said 1st press convex part and the said press recessed part in the caulking joining method of the metal member of any one of Claims 1-3. The total thickness of the sandwiched portion of the metal member is set to 20% or less of the total thickness before bonding, and the metal surrounded by the pressing protrusion and the pressing recess at the time of bonding The gist is that the ratio of the actual filling region where the metal member is actually filled with respect to the filling region of the member is defined as a filling rate, and the filling rate is set to 85% or more.

  In this invention, the plate | board thickness sum total of the to-be-clamped part of the metal member after the joining process clamped between the 1st press convex part and the press recessed part is set to 20% or less before a joining process. Moreover, the filling rate in the filling area | region of the metal member enclosed by the press convex part at the time of a joining process and a press recessed part is set to 85% or more. That is, reliable joining can be performed by performing caulking joining based on these two conditions.

  The invention according to claim 5 is the caulking joining method of the metal member according to any one of claims 1 to 4, wherein the metal member is a conductive terminal, and electrical connection is also achieved by caulking joining. That is the gist.

  In the present invention, a plurality of conductive terminals are joined as metal members to be joined, and electrical connection is achieved. That is, in this caulking joining method, joining (electrical connection) of metal members to each other can be surely performed, and therefore, the significance of application is great.

  The invention according to claim 6 is configured by using a first die having a pressing recess and a second die having a punch having a pressing projection opposed to the pressing recess, and a plurality of metal members are stacked. In addition, the metal member is sandwiched and held by the punches, and a part of the metal member is pressed from the pressing convex part toward the pressing concave part by the punching operation, and a part of the metal member is pressed. A metal member caulking and joining device that is engaged with each other by being deformed according to the shape of the pressing portion and the pressing concave portion, wherein the pressing convex portion of the punch is provided in the center. And a second pressing projection that is provided adjacent to a radially outer position of the first pressing projection and is shorter than the first pressing projection, and a part of the metal member is The periphery pressed by the first pressing convex portion and pressed by the first pressing convex portion Minute by pressing with the second pressing protrusion as its gist that it has to perform crimped.

  When caulking and joining a plurality of metal members using the caulking joining apparatus for metal members according to the present invention, the joining of the metal members becomes more reliable and applied to electrical connection as in the first aspect of the invention. Therefore, sufficient conduction can be ensured and reliability can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the joining method of the metallic member which can ensure sufficient conduction | electrical_connection and can improve reliability when it joins a metallic member more reliably and it applies to an electrical connection, and the crimping of a metallic member A joining device can be provided.

It is a side view of the crimping joining apparatus in this embodiment. It is a side view of the punch tip in this embodiment. It is a side view of the crimping joining apparatus after pressing in this embodiment. It is sectional drawing of the metal member after the press in a prior art example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a caulking joining device 1 according to the present embodiment includes a lower mold 2 made of a concave jig and an upper mold 3 that is opposed to the lower mold 2 in the vertical direction and is movable in the same direction. I have.

  The lower mold 2 is a fixed mold, and includes a first die 11 and a second die 12. A fitting hole 12a having a circular cross section is formed at the center of the second die 12, and a cylindrical first die 11 is fitted into the fitting hole 12a, and the upper surface of the first die 11; A pressing recess 13 is formed by the inner peripheral surface of the fitting hole 12 a of the second die 12. Incidentally, the first die 11 has a central convex portion 11a projecting in a truncated cone shape at about 1/3 of the depth (axial length) of the pressing concave portion 13 at the center portion of the upper surface, and a peripheral flat portion around the central convex portion 11a. 11b. The upper surface of the second die 12 (the surface facing the upper die 3) is a mounting surface 12b, and the two plate-like first and second metal members 4 and 5 are the mounting surfaces during processing. It is mounted so that the site | part to be mounted in 12b and to join may be located on the press recessed part 13. FIG. The metal members 4 and 5 are conductive terminals such as a copper alloy used for electronic parts, for example, and are the same metal.

  The upper mold 3 is a movable mold and is moved up and down by a vertical drive mechanism (not shown). The upper die 3 includes a punch 21 and a pressing plate 22, and the punch 21 is configured to further move up and down with respect to the pressing plate 22. The pressing plate 22 has a pressing surface 22a on the lower surface (the surface facing the lower mold 2). The pressing plate 22 contacts the upper surface of the metal members 4 and 5 that are workpieces during processing, and the mounting surface 12b of the second die 12. And hold vertically. Further, an insertion hole 22b having a circular cross section is formed in the center portion of the pressing plate 22, and a cylindrical punch 21 is inserted and supported in the insertion hole 22b so as to be movable in the vertical direction.

  As shown in FIGS. 1 and 2, the punch 21 is formed in a cylindrical shape having a slightly smaller diameter than the pressing recess 13 of the lower mold 2, and the lower end portion (a portion facing the pressing recess 13) is configured as a pressing protrusion 21 a. Has been. Incidentally, the pressing convex portion 21a indicates a portion protruding downward from the lower surface (pressing surface 22a) of the pressing plate 22 when the punch 21 is positioned at the lower moving end during processing (in the drawing, the lower portion than the broken line). ). The pressing convex portion 21a has a central pressing portion 21b protruding in a columnar shape at the central portion and a peripheral pressing portion 21c around the central pressing portion 21b. Both end surfaces of the central pressing portion 21b and the peripheral pressing portion 21c are flat surfaces. At the time of processing, the pressing projection 21a of the punch 21 enters the pressing recess 13 of the lower mold 2 so that the metal members 4 and 5 are caulked and joined.

Next, a method for joining the first and second metal members 4 and 5 will be described.
In a state where the upper mold 3 is opened with respect to the lower mold 2 as an initial state, the two metal members 4 and 5 to be processed are overlapped and placed on the placement surface 12b of the lower mold 2 to be joined. The mold is closed as shown in FIG. 1 while being positioned so as to be positioned on the pressing recess 13. The two metal members 4 and 5 are held between the placement surface 12 b of the lower mold 2 and the pressing surface 22 a of the upper mold 3.

  Next, as shown in FIG. 3, the punch 21 is moved downward in the axial direction by the vertical drive mechanism. By the downward movement of the punch 21, the central pressing portion 21 b of the pressing convex portion 21 a presses from the upper surface of the metal members 4, 5 toward the lower surface. Then, the metal members 4 and 5 extend in the moving direction of the punch 21 and are pushed into the pressing recess 13. When the lower end of the central pressing portion 21b enters the pressing recess 13 and the lower end of the peripheral pressing portion 21c reaches the lower end position of the punch 21 that is positioned below the pressing surface 22a of the upper mold 3, the metal member 4 , 5 are deformed following the concave and convex shapes of the pressing convex portion 21a and the pressing concave portion 13 to form a bottomed cylindrical joining portion 6. In the joint portion 6, the boundary between the metal members 4 and 5 is deformed so as to meander from the cylindrical portion 7 toward the bottom portion 8, and a locking portion 9 that locks in the axial direction (pressing direction) of the cylinder is generated. Are joined.

  In the case of the present embodiment, the metal members 4 and 5 are pressed by the central pressing portion 21b and mainly deformed so that the boundary meanders, and then the cylindrical base end portion 10 where the meandering deformation starts further is pressed by the peripheral pressing portion 21c. As a result, a step 10a is formed. At this time, since the peripheral pressing portion 21c is provided around the central pressing portion 21b, the peripheral portion pressed by the central pressing portion 21b of the metal members 4 and 5 is annularly pressed. Therefore, the formed step 10a is formed in a substantially circular shape around the opening of the cylinder. As a result of the above-described joining operation, as shown in the enlarged view of FIG. 3, the joining portion 6 of the metal members 4 and 5 is subjected to a sufficient pressing force by the peripheral pressing portion 21c on the base end portion 10 of the cylinder where the meandering deformation starts. In addition, since the bent shape at the base end portion 10 up to the locking portion 9 is slightly loosened, the gap generated at the boundary between the metal members 4 and 5 at the base end portion 10 due to the spring back or the like can be kept extremely small. It becomes.

Incidentally, hereinafter, specific settings and the like of the caulking joining apparatus 1 of the present embodiment will be described.
As shown in FIG. 3, the caulking and joining device 1 is configured so that when the total thickness T1 before joining of the first and second metal members 4 and 5 is 100%, the pressing convex portion 21a after joining is processed. The plate thickness total T2 of the sandwiched portion (bottom portion 8) sandwiched between the lower surface of the central pressing portion 21b and the bottom surface of the pressing recess 13 (upper surface of the central convex portion 11a of the first die 11) is The pressing amount is managed depending on whether or not it is.

  Further, as shown in the enlarged view of FIG. 3, in the axial cross section, when a substantially rectangular region surrounded by the pressing convex portion 21a and the pressing concave portion 13 corresponding to the cylindrical portion of the joint portion 6 is a filling region A0, A portion in which the metal members 4 and 5 are not filled is generated in the filling region A0 after the joining process. In this case, the space surrounded by the inner side surface of the pressing recess 13 and the lower surface 5a of the second metal member 5 is the unfilled region A2 with respect to the actually filled region A1 that is actually filled. After the joining process, the ratio of the actual filling area A1 to the filling area A0 becomes the filling rate, and the setting and control of the caulking joining apparatus 1 are performed using the plate thickness ratio (T2 / T1) before and after the processing.

As a result of performing simulations and the like by the present applicant, it has been found that when the plate thickness ratio is 20%, a preferable result can be obtained when the filling rate is 85% or more. Further, as shown in FIG. 2, the setting of the pressing convex portion 21a is such that the diameters of the central pressing portion 21b and the peripheral pressing portion 21c of the pressing convex portion 21a are D1 and D2, and the plates of the metal members 4 and 5 before joining processing. If the total thickness is T1, the following equation:

D2 = D1 + k × T1 (1.1 ≦ k ≦ 1.3)

It was found preferable to satisfy Therefore, in the caulking and joining apparatus 1 according to the present embodiment, the molds 2 and 3 are set and controlled along these, and a base in which a gap is likely to be generated due to the joining portion 6 of the metal members 4 and 5, particularly a springback or the like. The boundary of the end portion 10 can be reliably brought into contact and bonded.

Next, characteristic effects of the present embodiment will be described.
(1) The pressing convex portion 21a of the punch 21 has a central pressing portion 21b protruding in a columnar shape at the central portion and a peripheral pressing portion 21c around the central pressing portion 21b. During the joining operation, the first and second metal members 4, 5 are pressed by the central pressing portion 21b and mainly deformed so that the boundary meanders. It is pressed by the part 21c. As a result, the joining portion 6 of the metal members 4 and 5 is peripherally pressed to the base end portion 10 of the cylinder where the meandering deformation starts, that is, the portion where the boundary between the metal members is bent sharply and a gap due to springback or the like is likely to occur. Sufficient pressing force is applied by the portion 21c. Further, since the curve at the base end portion 10 up to the locking portion 9 is slightly loosened, the gap generated at the boundary between the metal members 4 and 5 at the base end portion 10 due to the spring back or the like is suppressed to be extremely small. As a result, joining between metal members becomes more reliable, and when applied to electrical connection, sufficient conduction can be ensured and reliability can be improved. In addition, since the metal members 4 and 5 of the present embodiment are conductive terminals that require more reliable joining (electrical connection), the significance of application is great.

  (2) The pressing convex portion 21a has a central pressing portion 21b protruding in a columnar shape at the central portion and a peripheral pressing portion 21c around the central pressing portion 21b. Therefore, the peripheral part (cylindrical base end part 10) pressed by the central pressing part 21b in the metal members 4 and 5 is annularly pressed. Thereby, the peripheral part of the metal member pressed by the center press part 21b is mutually joined by the whole circumferential direction, and a more reliable joining state can be anticipated.

  (3) The punch 21 has a pressing convex portion 21a integrally provided with a peripheral pressing portion 21c and a central pressing portion 21b. Further, the caulking and joining apparatus 1 can press the peripheral pressing portion 21c and the central pressing portion 21b with a single downward movement to join the metal members 4 and 5 together. As a result, the structure of the punch itself, the structure of the mechanism for operating the punch, and the like can be simplified, and the pressing by the first and second pressing protrusions can be performed by one operation of the punch, so that the bonding processing time is short. I can do it.

  (4) In this embodiment, when the plate thickness ratio (T2 / T1) before and after processing is 20%, the filling rate is set to 85% or more. Moreover, about the setting of the press convex part 21a, when the diameter of the center press part 21b and the peripheral press part 21c of the press convex part 21a is set to D1, D2, and the plate | board thickness sum total of the metal members 4 and 5 before joining processing is set to T1. The diameter D2 = D1 + k × T1 (1.1 ≦ k ≦ 1.3) of the peripheral pressing portion 21c is set. As a result, the caulking and joining apparatus 1 of the present embodiment can set and control the molds 2 and 3 along these, and easily generate gaps due to the joining portions 6 of the metal members 4 and 5, particularly spring back and the like. The boundary of the base end portion 10 can be reliably brought into contact and bonded.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, two metal members 4 and 5 are used, but a plurality of three or more members may be used.

In the above embodiment, the first and second metal members 4 and 5 are formed in a plate shape as a whole, but only portions to be joined may be formed in a plate shape.
In the above embodiment, the metal members 4 and 5 are made of the same metal, but they may be made of different metals.

In the above embodiment, the metal members 4 and 5 are conductive terminals. However, other than this, for example, the metal members 4 and 5 may be applied to joining metal members that are not required to be electrically connected.
In the above embodiment, the punch 21 is formed in a cylindrical shape having a slightly smaller diameter than the pressing concave portion 13 of the lower mold 2, but only the pressing convex portion 21 a at the lower end of the punch 21 is formed in a small diameter cylindrical shape. The main body portion 21 may be formed in a cylindrical shape larger than the diameter of the pressing recess 13.

In the above embodiment, the both end surfaces of the central pressing portion 21b and the peripheral pressing portion 21c are flat surfaces. However, for example, a curved surface, a slope, a multistage surface, or the like may be used.
In the above embodiment, the central pressing portion 21b of the pressing convex portion 21a of the punch 21 has a cylindrical shape and the peripheral pressing portion 21c has an annular shape, but may have other shapes such as a polygonal column shape or a polygonal annular shape.

In the above embodiment, the peripheral pressing portion 21c is provided on the entire periphery of the central pressing portion 21b, but may be provided at predetermined intervals in the circumferential direction of the central pressing portion 21b.
In the above embodiment, the peripheral pressing portion 21c and the central pressing portion 21b are integrally provided on the pressing convex portion 21a of the punch 21, but the central pressing portion 21b and the peripheral pressing portion 21c are configured by separate members. The pressing timing may be adjusted as appropriate.

  In the above embodiment, the pressing recess 13 is formed by the central protrusion 11a of the first die 11 and the inner peripheral surface of the fitting hole 12a of the second die 12. However, one die has the pressing recess. It may be a structure.

  In the above embodiment, the punch 21 is simply moved up and down to perform caulking and bonding, but for example, the punch 21 may be moved up and down while rotating.

  A0 ... filling region, A1 ... actual filling region, 1 ... caulking and joining device, 2 ... lower die (first die), 3 ... upper die (second die) 4,5 ... first and second metal members, 13 ... Pressing concave part, 21 ... Punch, 21a ... Pressing convex part, 21b ... Central pressing part (first pressing convex part), 21c ... Peripheral pressing part (second pressing convex part).

Claims (6)

Using a first mold having a pressing recess and a second mold having a punch having a pressing projection opposed to the pressing recess, a plurality of metal members are stacked and held between the two molds, A part of the metal member is pressed from the pressing convex part toward the pressing concave part by the punching operation, and the part is deformed following the shape of the pressing convex part and the pressing concave part. It is a caulking joining method of metal members that are locked together and joined together,
The pressing convex portion of the punch has a first pressing convex portion provided in the center and a second lower height than the first pressing convex portion provided adjacent to the radially outer position of the first pressing convex portion. Use what consists of pressing convex part,
A part of the metal member is pressed by the first pressing convex portion, and a peripheral portion pressed by the first pressing convex portion is pressed using the second pressing convex portion to perform caulking joining. A method for caulking and joining metal members, characterized by comprising: In the caulking joining method of the metal member according to claim 1,
The second pressing convex portion is provided in the periphery of the first pressing convex portion, and a peripheral portion pressed by the first pressing convex portion in the metal member is annularly formed using the second pressing convex portion. A method for caulking and joining metal members, characterized by being pressed. In the caulking joining method of the metal member according to claim 1 or 2,
The punch is provided with the second pressing convex portion integrally with the first pressing convex portion, and pressing by the first and second pressing convex portions is performed by one operation of the punch. A caulking joining method for metal members, which is characterized. In the caulking joining method of the metal member according to any one of claims 1 to 3,
The total plate thickness of the sandwiched portion of the metal member after the joining process sandwiched between the first pressing convex part and the pressing concave part is set to 20% or less of the total plate thickness before the joining process. ,
The ratio of the actual filling region in which the metal member is actually filled with respect to the filling region of the metal member surrounded by the pressing convex portion and the pressing concave portion at the time of joining processing is defined as a filling rate, and the filling rate is 85. % Caulking and joining method for metal members, characterized in that it is set to at least%. In the caulking joining method of the metal member according to any one of claims 1 to 4,
The method of caulking and joining metal members, wherein the metal member is a conductive terminal and is electrically connected by caulking. Consists of a first mold having a pressing recess and a second mold having a punch having a pressing projection opposed to the pressing recess, and a plurality of metal members are stacked and held between the two molds. Then, part of the metal member is pressed from the pressing convex part toward the pressing concave part by the punching operation, and the part is copied to the shape of the pressing convex part and the pressing concave part. It is a caulking joining device for metal members that are locked together by being deformed and joined,
The pressing convex portion of the punch has a first pressing convex portion provided in the center and a second lower height than the first pressing convex portion provided adjacent to the radially outer position of the first pressing convex portion. It consists of a pressing convex part,
A part of the metal member is pressed by the first pressing convex portion, and a peripheral portion pressed by the first pressing convex portion is pressed using the second pressing convex portion to perform caulking joining. An apparatus for caulking and bonding metal members, characterized in that

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