JP2016165760A - Sheet metal coupling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet metal coupling method capable of firmly pressure-welding first and second sheet metals while suppressing a protrusion amount of a spot swollen part that is formed in a sheet metal couple.SOLUTION: In accordance with the sheet metal coupling method, pressing is performed from the side of a first sheet metal 101 by a pin 24 in the state where a back padding plate 30 is interposed between a lower holding block 13 and a second sheet metal 102, and a back pressure for adhering the first and second sheet metals 101 and 102 is applied from the back padding plate 30 to the second sheet metal 102 while recessing the back padding plate 30 with a spot swollen part 100a that protrudes to a back face 102b of the second sheet metal 102. Therefore, newly generated surfaces that are made appear by enlarging areas of overlapped surfaces 101a and 102a of the first and second sheet metals 101 and 102 can be brought into slide contact while firmly pressing them with the pressure of the pin 24 and the back pressure of the back padding plate 30.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a sheet metal coupling method in which a first sheet metal and a second sheet metal are overlapped and locally pressed by a pin from the first sheet metal side and coupled.

  In this type of conventional sheet metal joining method, the first and second sheet metals that are overlapped are supported by a work support base from the second sheet metal side, and are locally pressed with a pin from the first sheet metal side. Thus, there is known a technique in which a spot bulging portion is formed, and the first and second sheet metals are press-contacted by the spot bulging portion (see, for example, Patent Document 1). According to this bonding method, it is considered that as the amount of the pin entering the first sheet metal is deeper, the area of the overlapping surface is enlarged and more new surfaces appear and the bonding strength is increased.

JP 2006-150416 A (paragraphs [0016] to [0029], FIGS. 1 and 2)

  However, in the conventional sheet metal joining method described above, there is a problem that the protrusion amount of the spot bulging portion increases when the protrusion amount of the pin is deepened.

  The present invention has been made in view of the above circumstances, and is a sheet metal bonding method capable of firmly pressing the first and second sheet metals while suppressing the protrusion amount of the spot bulging portion formed on the sheet metal pair. The purpose is to provide.

  According to the first aspect of the present invention, the first and second sheet metals are overlapped and supported by the work support base from the second sheet metal side, and locally from the first sheet metal side. In a sheet metal coupling method in which a spot bulge portion is formed by pressing the pin with a pin, and the first and second sheet metals are press-contacted with the spot bulge portion. A base is provided, and a backrest member deformable by the pressing force of the pin is interposed between the work support base and the second sheet metal, and the movable base and the work support base The first sheet metal and the backrest member are sandwiched between the first sheet metal and the first sheet metal with the pin, and the second sheet metal is pressed by the amount of movement exceeding the sheet thickness. As the spot bulge bulges from the outer surface of the While recessed member, a sheet metal bond wherein the for pressing said first and second sheet metal.

  The invention of claim 2 is in a state where the outer surface of the bulged portion of the backrest member is floated until the amount of movement of the pin pressing the first sheet metal exceeds the thickness of the first sheet metal. 2. The sheet metal bonding method according to claim 1, wherein an escape hole for maintaining is provided on an extension line of the pin in the work support base.

  The invention according to claim 3 is the sheet metal bonding method according to claim 1 or 2, wherein the tensile strength of the backrest member is set to be equal to or higher than the tensile strength of the second sheet metal.

  According to the first aspect of the present invention, the backrest member is interposed between the work support base and the second sheet metal, and between the movable base and the work support base that are fitted on the outside of the pin so as to be capable of linear movement. In a state in which the first and second sheet metal and the backing member are sandwiched, the pin is pressed from the first sheet metal side and the backing member is recessed by the spot bulging portion protruding from the back surface of the second sheet metal. However, since the back pressure for pressing the first and second sheet metal is applied from the backing member to the second sheet metal, it appears by expanding the area of the overlapping surface of the first and second sheet metals. The newly formed surfaces can be brought into sliding contact with each other while being strongly pressed by the pressing force of the pins and the back pressure of the backrest member. This makes it possible to firmly press the first and second sheet metal while suppressing the protrusion amount of the spot bulge portion. In particular, if the tensile strength of the backing member is greater than or equal to the second sheet metal, the first and second sheet metals can be brought into good pressure contact (invention of claim 3).

  Here, a part of the backrest member pushed by the spot bulge portion may be escaped and bulged into the hole (invention of claim 2). Depending on the material and shape of the backrest member, the spot bulge member may be bulged. You may make it let the volume of the part depressed by the protrusion part escape in the clearance gap formed between the sheet metal pair and the workpiece | work support base.

Side sectional view of sheet metal bond press Plan view of base Side sectional view of the sheet metal bonding press with the back plate and the first and second sheet metals set Side sectional view of the sheet metal bonding press with the sheet metal pair and the back plate sandwiched between the upper clamping block and the lower clamping block Side cross-sectional view of sheet metal bonding press immediately after pressing with a pin Side cross-sectional view of sheet metal bonding press at the end of pressing with pins Side cross-sectional view of joined sheet metal pair

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a side sectional view of a sheet metal bonding press 10 of the present invention. As shown in the figure, a disk-like base block 12 is provided at the upper end of the base 11 of the sheet metal bonding press 10, and a cylindrical lower clamping block 13 is held at the center of the base block 12. ing. The upper surface of the base block 12 and the upper surface of the lower clamping block 13 are flush with each other. A relief hole 14 is formed at the center of the lower clamping block 13. The escape hole 14 has a circular cross section and penetrates the lower clamping block 13 in the vertical direction. A knockout pin 15 is provided in the escape hole 14 so as to be movable. A structure without the knockout pin 15 may be used. In that case, the relief hole 14 may have a bottomed structure that does not penetrate the lower clamping block 13. The lower clamping block 13 corresponds to the “work support base” of the present invention.

  A movable platen 20 is provided above the lower clamping block 13. The movable platen 20 is supported by a frame (not shown) of the sheet metal bonding press 10 so as to be movable up and down, and a pin holder 21 is provided at the lower end of the movable platen 20. A cylindrical hole 22 having an open lower end is formed at the center of the pin holder 21. The cylindrical hole 22 has an annular cross section, and a cylindrical upper clamping block 23 (corresponding to the “movable base” of the present invention) is assembled to the lower end of the cylindrical hole 22 so as to be linearly movable and prevented from coming off. ing. A pin holding hole 21A and a pin insertion hole 23A are formed through each central portion of the pin holder 21 and the upper clamping block 23, and an elongated cylindrical pin 24 is passed through the pin holding hole 21A and the pin insertion hole 23A. . The upper end portion of the pin 24 is enlarged in a taper shape and is fitted to the taper portion of the pin holding hole 21A. Further, a shaft-like backup member 27 press-fitted into the pin holding hole 21A is abutted against the upper end portion of the pin 24, and the pin holder 21 and the pin 24 are fixed so as to move up and down integrally. Here, the shape of the pin 24 is not limited to a cylindrical shape, and may be a polygonal column shape.

  A coil spring 25 is accommodated in the cylindrical hole 22 of the pin holder 21, and the coil spring 25 is stretched between the upper end portion of the cylindrical hole 22 and the upper surface of the upper holding block 23. Thereby, the upper clamping block 23 is urged so as to protrude downward from the cylindrical hole 22, and is always in a state where the entire pin 24 is accommodated in the pin insertion hole 23 </ b> A (specifically, the lower end surface of the pin 24 and The lower clamping surface of the upper clamping block 23 is maintained in a flush state. A central shaft portion 21B inserted into the coil spring 25 in the pin holder 21 is fitted in a central recess 23B formed in a recess in the upper surface of the upper holding block 23 so as to be directly movable. The inclination of the clamping block 23 can be prevented.

  Further, the sheet metal bonding press 10 of the present embodiment includes a metal back plate 30. The back plate 30 has, for example, a flat plate shape and is used by being sandwiched between the sheet metal pair 100 and the lower clamping block 13 (see FIG. 4). The back plate 30 is formed by bonding a sheet metal, and a bond film is formed on both surfaces in the thickness direction.

  The material of the back plate 30 is not particularly limited. For example, aluminum metal, iron metal, titanium metal, copper metal, and other metals may be used. Here, it is preferable that the back plate 30 has the same degree of plastic deformation as the first sheet metal 101 or the second sheet metal 102 that is the object to be joined. The back plate 30 is more preferably a metal having a tensile strength equal to or higher than the tensile strength of the second sheet metal 102. The plate thickness of the back plate 30 is more preferably equal to or greater than the plate thickness of the first sheet metal 101 and the second sheet metal 102. Specifically, for example, waste material generated by punching the first sheet metal 101 or the second sheet metal 102 may be used for the back plate 30.

  The configuration of the sheet metal bonding press 10 is as described above. Here, the material of the first and second sheet metals 101 and 102 is not limited. For example, pure aluminum (A1000 series), aluminum alloys (for example, A2000 series, A5000 series, 6000 series), pure iron, iron alloys (for example, S10C to 45C, SUS304, SU316, SUS430), pure titanium (for example, TB340C) , Titanium alloy, pure copper (for example, oxygen-free copper), copper alloy, and other metals may be used. The combination of the first and second sheet metals 101 and 102 may be, for example, a combination of the same metals such as aluminum alloys or iron alloys, or pure iron and an iron alloy (for example, SUS304, SU316, SUS430, etc.), Iron metal (pure iron or iron alloy) and aluminum metal (pure aluminum or aluminum alloy), titanium metal (pure titanium or titanium alloy), iron metal (pure iron or iron alloy), titanium metal (pure titanium) Or titanium alloy) and aluminum metal (pure aluminum or aluminum alloy), copper metal (pure copper or copper alloy) and iron metal (pure iron or iron alloy), copper metal (pure copper or copper alloy) and aluminum metal A combination of different metals such as (pure aluminum or aluminum alloy) may be used.

  Next, a method for bonding the first and second sheet metals 101 and 102 using the sheet metal bonding press 10 will be described. First, the back plate 30 is placed on the upper surface of the lower clamping block 13. At this time, it arrange | positions so that the upper surface opening of the escape hole 14 may be plugged up with the back plate 30 (refer FIG. 3).

  Next, the first and second sheet metals 101 and 102 are stacked and set on the back plate 30. The first and second sheet metals 101 and 102 are bonded in advance, and after the bonder film and the oxide film are removed from each side of the sheet metals 101 and 102, the film removal surfaces from which the films are removed are overlapped. Match. The removal of the film may be performed by polishing (for example, emery polishing or wire buffing), grinding, or chemical treatment.

  Next, the movable platen 20 of the sheet metal bonding press 10 is lowered. Then, as shown in FIG. 4, the upper clamping block 23 contacts the upper surface of the sheet metal pair 100 simultaneously with the pin 24, and the portion of the sheet metal pair 100 and the back plate 30 that the pin 24 abuts (on the extension line of the pin 24). The periphery of the portion) is clamped between the lower clamping block 13 and the upper clamping block 23. When the movable platen 20 is further lowered from this state, the pin holder 21 is lowered with respect to the upper holding block 23, and the pin 24 protrudes from the lower end surface of the upper holding block 23 as shown in FIG.

  The pin 24 protruding from the lower end surface of the upper clamping block 23 locally presses the first sheet metal 101 disposed on the upper side of the sheet metal pair 100. Then, a portion pressed by the pin 24 in the first sheet metal 101 is locally depressed to form a bottomed cylindrical depression 101c. Further, the portion pushed away with the formation of the depressed portion 101c is pushed out to the second sheet metal 102 side, and a substantially spherical bulging surface 101e is formed on the overlapping surface 101a (film removal surface) of the first sheet metal 101. Is formed (see FIG. 7).

  Further, the second sheet metal 102 is plastically deformed by being pushed by a portion of the first sheet metal 101 that is pushed away by the pin 24. That is, a substantially spherical depressed surface 102e is formed on the overlapping surface 102a (film removal surface) of the second sheet metal following the bulging surface 101e formed on the first sheet metal 101. What is the overlapping surface 102a? A bulging surface 102c is formed on the back surface 102b on the opposite side. That is, a spot bulging portion 100 a bulging toward the back plate 30 is formed in a portion pressed by the pin 24 of the sheet metal pair 100. Then, for example, as shown in FIG. 6, until the bottom surface 101d of the depressed portion 101c formed in the first sheet metal 101 is formed in the middle between the back surface 102b of the second sheet metal 102 and the overlapping surface 102a. The movable platen 20 is lowered and the pin 24 is pushed into the depressed portion 101c.

  As described above, when the sheet metal pair 100 is pushed and plastically deformed by the pins 24, the back plate 30 is plastically deformed by being pushed by this. That is, a portion of the back plate 30 that is pressed by the spot bulging portion 100 a of the sheet metal pair 100 bulges into the escape hole 14. Further, the back plate 30 has the first and second sheet metals 101, 101 from the beginning of the pressing of the pin 24 against the sheet metal pair 100 (the beginning of the formation of the spot bulging portion 100 a) until the pressing of the pin 24 is completed. Continue to apply back pressure to press 102.

  In the process in which the first and second sheet metals 101 and 102 are plastically deformed as described above, the area of the overlapping surfaces 101a and 102a gradually expands and a new surface appears, and the new surfaces come into sliding contact with each other. At this time, due to the pressing force of the pins 24 and the back pressure of the back plate 30, the new surfaces are slidably contacted with each other. Thereby, the overlapping surfaces 101a and 102a of the first and second sheet metals 101 and 102 can be brought into pressure contact with each other at the spot bulging portion 100a.

  When the pressing by the pins 24 is completed, the movable platen 20 is raised, and the combined sheet metal pair 100 and the used back plate 30 are removed from the sheet metal bonding press 10. At this time, the knockout pin 15 may be moved linearly to push up the sheet metal pair 100 and the back plate 30 from below. Bonded films are formed on both surfaces of the back plate 30 in the plate thickness direction. Therefore, between the back plate 30 and the lower clamping block 13 and between the back plate 30 and the sheet metal pair 100 (second sheet metal 102). It is possible to reliably prevent the occurrence of adhesion between the two. In addition, since the upper surface 101b of the first sheet metal 101 is also formed with the bond film, it is possible to prevent adhesion between the pin 24 and the first sheet metal 101.

  As described above, according to the present embodiment, the back clamping plate 30 is interposed between the lower clamping block 13 and the second sheet metal 102, and the upper clamping block 23 is fitted to the outside of the pin 24 so as to be directly movable. In the state where the first and second sheet metals 101, 102 and the back plate 30 are sandwiched between the first sheet metal 101 and the lower clamping block 13, the second sheet metal is pressed from the first sheet metal 101 side. The back plate 30 is depressed by the spot bulging portion 100a protruding from the back surface 102b of the back plate 102, and back pressure is applied from the back plate 30 to the second plate 102 to press-contact the first and second sheet metals 101, 102. Since the new surfaces appearing due to the area expansion of the overlapping surfaces 101a, 102a of the first and second sheet metals 101, 102 are applied to each other, the pressing force of the pin 24 and the back plate 30 are used. Thereby sliding while pressing strongly by the back pressure. This makes it possible to firmly press the first and second metal plates 101 and 102 while suppressing the protruding amount of the spot bulging portion 100a.

[Example]
Using the sheet metal bonding press 10 described in the above embodiment, the first and second sheet metals 101 and 102 (sheet metal pair 100) were bonded under the following conditions. That is, a sheet metal made of an iron-based alloy (carbon steel S45C) having a thickness of 3.0 mm is prepared as the first sheet metal 101, and an aluminum-based alloy (A2017) having a thickness of 3.0 mm is prepared as the second sheet metal 102. A sheet metal made of pure aluminum (A1000 series) having a thickness of 3.0 mm was prepared, and a sheet metal made of an iron alloy (carbon steel S45C) having a thickness of 3.0 mm was prepared as the back plate 30. Then, using the pin 24 having a diameter of 5.0 mm, the position of the bottom surface 101d of the depressed portion 101c formed on the first sheet metal 101 is 1.5 mm from the back surface 102b of the second sheet metal 102, and the overlapping surface 102a. A spot bulging portion 100a is formed so as to be offset to the side, and the first and second sheet metals 101 and 102 are joined.

  A cross tensile test defined in “JIS Z3137” was performed on the sheet metal pair 100 bonded under the above conditions to confirm the bonding strength. In addition, an experiment was conducted in which the peeled surfaces of the first and second sheet metals 101 and 102 separated by the cross tension test were observed with an electron microscope.

[Experimental result]
As a result of the cross tension test, when the second sheet metal 102 is made of an aluminum alloy (A2017), the load (bonding strength) required to separate the first and second sheet metals 101, 102 is about It was 500 [kgf]. Further, when the second sheet metal 102 is made of pure aluminum (A1000 series), the load (bonding strength) required to separate the first and second sheet metals 101, 102 is about 226 [kgf]. Met. Further, as a result of observation with an electron microscope, a part of the second sheet metal 102 (aluminum alloy or pure aluminum) is found on the peeling surface (the bulging surface 101e formed on the overlapping surface 101a) of the first sheet metal 101. It was confirmed that they were attached. From this, it was found that the first sheet metal 101 and the second sheet metal 102 were in pressure contact with each other at the spot bulging portion 100a.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, the escape hole 14 is formed on the upper surface 13A of the lower clamping block 13. However, the escape hole 14 is not formed, but the back plate 30 is pushed away by the spot bulging portion 100a. You may make it escape the side part in the clearance gap between the sheet metal pair 100 and the lower clamping block 13 sideways.

  (2) In the above embodiment, the spot bulging portion 100a is formed and pressed in one place of the sheet metal pair 100, but a plurality of pins 24 are attached to the pin holder 21 and a plurality of spot bulges are simultaneously formed. The portion 100a may be formed and press-contacted. In that case, a plurality of escape holes 14 may be provided so as to correspond to the plurality of pins 24, respectively, or one escape hole 14 may be shared by the plurality of pins 24. If the plurality of pins 24 share one escape hole 14, the production cost of the lower clamping block 13 can be reduced as compared with the case where the same plurality of escape holes 14 as the pins 24 are provided.

  (3) In the above embodiment, the back plate 30 is made of metal, but the back plate 30 may be made of resin or rubber that can be elastically deformed. In this way, the back plate 30 can be used repeatedly.

  (4) In the above embodiment, the bonder film is formed on the back surface 102b of the second sheet metal 102. However, when the bonder film is formed on both surfaces in the plate thickness direction of the back plate 30, the second The bond film on the back surface 102b of the sheet metal 102 may be omitted.

  (5) In the above embodiment, the bonder film is formed on the upper surface 101b and the back surface 102b opposite to the overlapping surfaces 101a and 102a of the first and second sheet metals, but instead of forming the bonder film. Even if oil (plastic processing oil) is applied, the same effect can be obtained.

  (6) In the above embodiment, the back plate 30 is disposed under the sheet metal pair 100 formed by superimposing the first and second sheet metals 101 and 102, and the sheet metal pair 100 is pressed with the pins 24 from above. The configuration may be such that the back plate 30 is disposed on the sheet metal pair 100 and the sheet metal pair 100 is pressed by the pins 24 from below.

  (7) In the above embodiment, the backrest plate 30 exemplified as the “backrest member” according to the present invention has a plate shape. However, the “backrest member” does not have to be a plate shape, for example, a block shape. (A cutting material obtained by rounding a round bar) may be used.

10 Sheet metal bonding press 12 Base block 13 Lower clamping block (work support base)
14 Relief hole 20 Movable platen 21 Pin holder 23 Upper clamping block (movable base)
24 pin 30 Back plate (Back member)
100a Spot bulging portion 101 First sheet metal 102 Second sheet metal

Claims (3)

The first and second sheet metal are overlapped and supported by the work support base from the second sheet metal side, and a spot bulge is formed by locally pressing with a pin from the first sheet metal side, In the sheet metal coupling method in which the first and second sheet metals are press-contacted at the spot bulge portion,
A movable base fitted so as to be linearly movable is provided outside the pin,
Between the work support base and the second sheet metal, a state where a backrest member deformable by the pressing force of the pin is interposed,
Between the movable base and the workpiece support base, the first sheet metal and the backrest member are sandwiched between the movable sheet and the work support base so that the first sheet metal is moved by the pin beyond its thickness. The first and second metal plates are pressed against each other while the backrest member is depressed as the spot bulge portion bulges from the outer surface of the second metal plate. Sheet metal bonding method.   An escape hole for maintaining the outer surface of the bulging portion of the backrest member in a floating state until the amount of movement by which the pin presses the first sheet metal exceeds the thickness of the first sheet metal. The sheet metal coupling method according to claim 1, wherein the sheet metal coupling method is provided on an extension line of the pin in the workpiece support base.   The sheet metal bonding method according to claim 1 or 2, wherein a tensile strength of the backrest member is set to be equal to or higher than a tensile strength of the second sheet metal.

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