JPH0576962A - Method and device for calking and joining metal plate - Google Patents

Abstract

PURPOSE:To easily and efficiently join by calking two superposed metal plates. CONSTITUTION:The two metal plates 1, 2 are laid between a projection roll 15, whose tip end face 17b is provided with a concave protruded blade 17, and a receiver roll 16 whose bottom face 18b is provided with a convex receiving groove 18. The superposed part 11 of the two metal plates 1, 2 is lanced, pushed in simultaneously and upset to extend at a part A between the lanced lines. Thus, the part A having a concave section between the notched lines is obtained (first process). Then, the plates are passed through between the roll with the projection and the cylindrical roll. The part A between the notched lines is sandwiched by compression between the projecting part of the roll with the projection and the cylindrical roll, and is bent back (second process). Since the width of the part A between the notched lines is widened, this part is not separated from a punched hole, and the two metal plates 1, 2 are securely joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking joining method and apparatus for joining two metal plates.

[0002]

2. Description of the Related Art Conventionally, as a method of joining two metal plates to each other, as shown in FIGS. At the same time as inserting the two score lines 3 into the
Then, a method is known in which the part A between the scoring lines is swaged (that is, a plastic deformation process in which a compressive force is applied to the material to spread it) so that its width b is wider than the original width a between the scoring lines. .. In this joining method, the above-mentioned indentation widening process cannot be carried out with a simple die consisting of a mere convex punch and a concave die, so various measures have been taken. For example, in Japanese Examined Patent Publication No. 63-52998, FIG.
As shown in FIG. 4, the punch 5 is a normal mere convex type, and the die 6 side is composed of a fixed end 7 and leaf springs 8 provided on both sides of the punch 6 and capable of expanding to the left and right. When the two metal plates 1 and 2 stacked by the press are pressed, the two cut lines 3 are formed by the left and right edges 5a of the punch 5 and the opposing edges 8a of the left and right leaf springs 8 of the die 6.
At the same time, the part A between the cutting lines is pushed in, and the part A between the cutting lines of the two metal plates 1 and 2 is swaged by the tip surface of the punch 5 and the fixed end 7 of the die 6 to make the width. The method is to spread it. During this upsetting,
The left and right leaf springs 8 escape to the left and right to allow the width of the inter-cutting line portion A to widen and to facilitate the widened portion A to be extracted from the die hole.

Japanese Patent Publication No. 63-52998 discloses a method in which a pair of rolls facing each other are provided with portions corresponding to punches and dies, respectively, and caulking and joining by the above-mentioned push-in widening method. There is. However, the die part provided on this roll has a structure in which the side wall can be expanded as described above.

[0004]

The above-mentioned conventional method of providing the expandable leaf spring 8 on the side of the die 6 is structurally complicated because a part of the mold moves, and the elasticity is not improved. Since it is necessary to use a material that has it, it is not preferable as a tool that requires high hardness, and there is a problem that durability is low.

By the way, the most problematic point in the case of performing the crimping joining by this kind of the push-in widening method is that the widening process is performed in the die hole. In other words, it is possible to actually widen the width in the die, and it is possible to pull out the widened portion from the die hole, and the method of achieving this has become a major concern so far. It was

However, the inventors of the present invention have variously studied a method of joining the overlapping portions when forming a molded product having a cross-sectional shape having two overlapping portions from a band-shaped metal plate by a roll forming machine. As a result of repeated experiments, in a roll forming machine, when punching and widening processing were performed by a punch and a die hole provided on a pair of rolls facing the forming material, the metal plate was strongly grasped by the forming roll. That the die hole on the outer circumference of the roll moves forward with the metal plate and gradually moves away from the metal plate.
Also, since the movement of the die hole portion at that time is performed with the metal plate being sandwiched between the pair of opposing rolls, it is not possible to expand the side wall of the die hole like the leaf spring 8 in FIG. However, a strong force that pulls out the widened portion from the die hole portion works, and the widened portion can be smoothly pulled out from the die hole portion, and the amount of widening possible in that case. It is not so large that the shear clearance between the punch and the die hole is equivalent, but it was found that the joining force is enough to withstand the use unless the use condition in which a particularly strong peeling force is applied. ..

[0007] However, it is desirable to further strengthen the joining force, and it is desirable not only to perform the crimping joining in the roll forming machine but also to perform the crimping joining independently.

The present invention has been made in view of the above circumstances, and can be made simply and without using a complicated mechanism such as a method in which two side-by-side metal plates can open the side wall on the die hole side. An object of the present invention is to provide a method and a device for caulking and joining efficiently.

[0009]

SUMMARY OF THE INVENTION The present invention for solving the above problems is a caulking method for caulking and joining two superposed metal plates, each of which is provided on the outer circumference of a pair of opposing rolls. With a protruding blade having a concave surface and a receiving groove having a convex bottom surface facing the protruding blade, the two metal plates stacked between the pair of rolls are almost in the feed direction. At the same time as inserting two notch lines of appropriate length, press the notch part between the notch lines by two or more plate thicknesses, and the notch part between the notch of the protruding blade and the convex shape of the receiving groove. The first step of bending and spreading the cut line portion into a concave cross section with the bottom of the roll and the cut line portion provided on the outer circumference of one of the pair of rolls facing each other. With a flat tip surface that can press And a cylindrical outer peripheral surface of the other roll, the second step of flatly bending back the portion between the cut lines having the concave cross section of the two stacked metal plates which are passed between the pair of rolls. And having.

A second aspect of the present invention is an apparatus for specifically carrying out the crimping and joining method.

[0011]

[Function] In the above-mentioned configuration, the inter-cutting line portion that has been swaged in the first step has a developed length in the width direction larger than the original cutting line interval dimension (that is, widened), Since the cross section is concave, the linear width between the cut lines does not increase. Therefore,
Both side edges of the notch line do not bite into the side wall of the receiving groove, and are easily extracted from the receiving groove.

When the portion between the cut lines having the concave cross section is bent back to a flat shape in the subsequent second step, since this portion is originally expanded, the width of the flat portion between the cut lines is sufficiently wide. Since both side edges hit the side edges of the punched hole portion, the two metal plates are firmly joined.

Since the upsetting in the first step is performed while bending the portion between the cut lines into a concave cross section, the roll rolling force in the vertical direction is not perpendicular to the plate surface but at an angle. Therefore, the rolling-down force is divided into a component in the direction perpendicular to the plate surface and a component in the plate width direction. This component in the plate width direction is caused by frictional force in the width direction directly between the cut lines. Since it acts as a pulling force, it is possible to secure a desired spread amount (width widening amount) with a smaller rolling force as compared to the case of performing flattening processing simply by keeping it flat.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The structure itself of the final caulked joint obtained by the present invention is the same as the joint of the push widening method shown in FIGS. 13 to 15. The following example shows a case in which the overlapping portion 11 of the molded product 10 is caulked and joined when the molded product 10 having the cross-sectional shape shown in FIG. Note. This molded product 10 is a flat deck plate for a reinforced concrete floor plate whose entire upper surface is flat, and has a cross-sectional shape having a vertical overlapping portion 11 as shown in order to flatten the entire upper surface. No gap is created in the superposed portion 11 so that concrete placed on the flat deck plate will not penetrate into the lower space from between the two superposed portions 11 (arrow (a)). Are required to be joined. In the embodiment, the roll forming machine forms the flat upper surface of FIG. The caulking joining device of the embodiment is
After the overlapping portion 11 is formed by the multi-stage forming rolls arranged in tandem, that is, it is arranged on the exit side of the forming roll of the forming roll or between the roll stands near the final stage. In FIG. 11, reference numerals 12 and 1
Reference numeral 3 denotes a former stage and a final stage forming roll of the final stage. In the illustrated example, a caulking joining device 14 is arranged on the exit side of the final stage forming roll 13.

The caulking and joining device 14 comprises a pair of rolls 14A for pushing / bending and spreading which are made up of a pair of rolls facing each other.
And a flat bending-back roll 14B made up of a pair of rolls arranged in tandem.

The pressing / bending / rolling roll 14A is used for the processing in the first step. As shown in FIGS. 1 to 3 showing the first step and FIG. 5 and FIG. In addition, it is composed of a pair of rolls, a projecting roll 15 and a receiving roll 16 that sandwich the overlapping portion 11 of the molding material 10 (that is, the two metal plates 1 and 2 that have been overlapped) and pass them through. The pair of rolls 15 and 16 may be driven by using the power of the molding machine, but may be non-driving because of the driving force of the material by the molding rolls.

As shown in FIG. 7, the ejection roll 15 has cutting edges 17a on both side edges and a front end surface 17b.
Has an arcuate concave surface and has a protruding blade 17 protruding from the roll outer periphery 15a. In the illustrated example, as shown in FIG. 1 and the like, the projecting blades 17 are provided at two positions facing each other by 180 °. Further, the protruding blade 17 is manufactured as a member different from the roll body so that it can be replaced when worn, and is attached to the roll body with bolts so that it can be attached and detached.

The receiving roll 16 has the protruding blade 1
7 has cutting edges 18a corresponding to the left and right cutting edges 17a, and a gap g of two or less of the plate thickness t of the metal plate between the protruding edge 17 and the arcuate concave tip surface 17b (that is, , G <2t), the receiving groove 18 having a bottom surface 18b having a circular arc convex shape is provided on the outer circumference. The receiving groove 18 in the illustrated example is formed over the entire circumference of the receiving roll 16. However, the receiving groove may be formed in a concave shape only in the portion facing the protruding blade 17.

The flat bending-back roll 14B is the second
As shown in FIG. 8 which is an enlarged view of the main part of FIG. 4 and FIG. 4B showing the second step, the protrusion for inserting the overlapping portion 11 of the molding material 10 and passing it through the plate. It is composed of a pair of rolls including a part-rolled roll 25 and a cylindrical roll 26. The pair of rolls 25 and 26 may be driven or not driven.

In the roll 25 with the protruding portion, the tip end face capable of pressing the portion between the cut lines formed in the first step is flat (it is flat when viewed from the radial direction of the roll, and is arcuate when viewed from the central axis direction). Is provided). The cylindrical roll 26 has a simple cylindrical outer circumference.

With reference to FIGS. 1 to 3, FIG. 5 to FIG. 7 and FIG. 9 showing the first step and FIG. 4, FIG. 8 and FIG. To explain, in FIG. 1, the overlapping part 11 of the molding material 10 (the two metal plates 1, which are overlapped with each other) is provided between the ejecting roll 15 and the receiving roll 16 of the pushing / bending and spreading roll 14A.
2) is a state in which it is sandwiched by the outer peripheral surfaces 15a and 16a of both rolls 15 and 16 and is simply passed through, and the protruding blade 1
7 is separated from the overlapping portion 11.

When the molding material 10 is fed and both rolls 15 and 16 rotate, the protruding blade 17 comes into contact with the metal plate to start cutting and pushing deformation as shown in FIG. When both rolls 15 and 16 further rotate as the metal plates 1 and 2 move forward, two parallel cut lines 3 (see FIG. 13) are made in the metal plates 1 and 2 by the protruding blade 17 and the receiving groove 18. At the same time, the part A between the two cut lines has a plate thickness t of 2
More than one sheet has been pushed in, and as shown in the enlarged view of FIGS.
The arcuate concave end surface 17b and the arcuate convex bottom surface 18b of the receiving groove 18 are swaged so that the inter-cutting line portion A is bent and extended in an arcuate cross section. That is, the developed length in the width direction of the part A between the cut lines becomes longer than the original cut line interval dimension a due to the plastic deformation.

In this case, the portion A between the extended notches
Although the expanded length of No. 1 is long, the linear width of the portion A between the cut lines does not become large because the cross section is concave. Therefore, both side edges of the part A between the cut lines do not bite into the side wall of the receiving groove 16 and are easily extracted from the receiving groove 16.

The upsetting in the first step is
Since the part A between the cut lines is bent while having a concave cross section, the roll rolling force in the vertical direction acts at an angle that is not perpendicular to the plate surface. Therefore, the rolling force is
It is divided into a component in the direction perpendicular to the plate surface and a component in the plate width direction. Since this component in the plate width direction acts as a force that directly pulls the part between the cut lines in the width direction due to frictional force, it is simply flat. It is possible to secure a desired spread amount (width widening amount) with a small rolling force as compared to the case of performing the infeed processing as it is. In addition, for example, a considerable rolling-down force is required in order to spread the range of, for example, about 2 cm ² (the area between the cut lines A in the embodiment) of the two-layered portion of the steel plates having a thickness of about 1.0 mm. In the case of using a roll as in the present invention, the roll support structure is required to have sufficiently high rigidity, and considering the installation space and other factors, it is not always easy, but since the rolling force is reduced, the equipment is simple. I just need something.

A portion A between the cut lines having an arcuate cross-section formed by the pushing / bending / rolling roll 14A protrudes from the roll 25 with a protrusion to be fitted into the punching hole when passing through the subsequent flat bending-back roll 14B. It is pinched by the portion 27 and the opposing cylindrical roll 26, and is bent back flat as shown in FIGS. 8 and 10. Since the inter-cutting line portion A that has been bent back to this flat is expanded first, the width of the flattened inter-cutting line portion A is sufficiently wide that the side of the hole portion where both side edges are punched out. Since it hits the edge, the two metal plates 1 and 2 are firmly joined. Thus, as a final shape, a caulking joint portion having the same structure as the conventional caulking joint structure described in FIGS. 13 to 15 is obtained.

The cross-sectional shape of the inter-cutting line portion A bent in the first step is an arc shape in the embodiment, but is V-shaped,
It may be trapezoidal or the like. In short, if the cross section is not flat but concave, both side edges do not get caught in the side walls of the receiving groove 16 even if the inter-cutting line portion A is extended, and the rolling force required for the extension is small. ..

[0027]

EFFECTS OF THE INVENTION According to the present invention, when two stacked metal plates are joined by a push-in widening method, a roll is used and at the time of upsetting the part between the cut lines. This part was once bent and expanded to have a concave cross-section, and then the part between the cut lines having the concave cross-section was flattened back to form a widened part between the cut lines. It is now possible to perform crimping joints easily and efficiently without relying on a complicated mechanism such as expanding the side wall on the side.

The upsetting in the first step is
Since the part between the cut lines is bent while having a concave cross-section, the desired amount of expansion (width expansion amount) can be achieved with a small rolling force as compared with the case of simply performing infeed. It can be secured and the equipment does not have to be large-scaled.

Further, unlike the conventional case where the side wall of the die is formed of a leaf spring, a tool material having a sufficiently high hardness can be used, and a sufficiently high durability can be obtained in combination with the absence of a moving part.

[Brief description of drawings]

FIG. 1 is a view for explaining a first step in one embodiment of a caulking joining method of the present invention, in which a superposed portion of metal plates passes between an ejecting roll and a receiving roll of a pushing / bending and spreading roll. FIG. 2A is a plan view and FIG. 2B is a front view of a main part.

FIG. 2 is also a view for explaining the first step, showing a state immediately before the extrusion roll and the receiving roll of FIG. 1 are rotated and pushed into the overlapping portion of the metal plate to start the widening process. (A) is a plan view and (b) is a front view of the main part.

FIG. 3 is also a view for explaining the first step, showing a state in which the ejecting roll and the receiving roll of FIG. 2 are further rotated and are being pushed into the overlapping portion of the metal plate to perform widening processing. (A) is a plan view and (b) is a front view of the main part.

FIG. 4 is a view for explaining a subsequent second step, in which the overlapping portion of the metal plates is passed between the roll with the protrusion and the cylindrical roll in the flat bending-back roll, and the flat bending-back roll is formed in the first step. The push-in / bend extension part is shown in a state of being bent back. Fig. 1 (a) is a plan view and Fig. 2 (b) is a front view of the main part.

FIG. 5 is an enlarged view of a main part of FIG.

FIG. 6 is an enlarged view of a main part of FIG.

7 is an enlarged perspective view of a protruding blade portion in FIG. 5 and the like.

FIG. 8 is an enlarged view of a main part of FIG.

FIG. 9 is a perspective view of an intermediate portion cut between the cut lines after passing through the pushing / bending and spreading roll in the first step.

FIG. 10 is a perspective view of the middle portion of the portion between the score lines after passing through the flat bending-back roll in the second step.

FIG. 11 is a side view showing a state in which the above-described caulking joining device is arranged in the roll forming machine.

FIG. 12 is a view showing a cross section of a molded product to be processed in the example of the present invention.

FIG. 13 is a plan view of a crimp joint structure known per se to be realized by the present invention.

14 is a sectional view taken along line XX in FIG.

15 is a cross-sectional view taken along the line YY in FIG.

FIG. 16 is a perspective view of a main part showing a conventional caulking and joining device.

[Explanation of symbols]

 1, 2 Metal plate 3 Cut line A Part between cut lines 10 Molded product (flat deck plate) 11 Lapping part 14 Caulking joining device 14A Push-in / bend spreading roll 14B Flat bend-back roll 15 Extrusion roll 16 Receiving roll 17 Extrusion Blade 17a Cutting edge 17b Tip surface 18 Receiving groove 18a Cutting edge 18b Bottom surface 25 Roll with protrusion 26 Cylindrical roll 27 Projection g Gap t Metal plate thickness

Claims (2)

[Claims] 1. A caulking joining method for caulking and joining two superposed metal plates, which comprises a protruding blade having a concave front end surface provided on the outer circumference of a pair of opposed rolls and a bottom surface facing the protruding blade. This is because of the convex receiving groove
Insert two notch lines of appropriate length, which are approximately in the metal plate feed direction, into two overlapping metal plates that are passed between a pair of rolls, and at the same time, make the part between the notch lines two plates thick. Bending more than a minute and swaging the part between the cutting lines with the concave tip surface of the protruding blade and the convex bottom surface of the receiving groove to bend and spread the part between the cutting lines into a concave cross section. By the first step and a protrusion having a flat tip end face which is provided on the outer circumference of one of the pair of rolls facing each other and which can press the portion between the cut lines, and the cylindrical outer circumferential surface of the other roll, A second step of flattening back the portion between the cut lines having a concave cross-section of the two stacked metal plates which are passed through between the pair of rolls, and the caulking joining of the metal plates is performed. Method. 2. A caulking joining device for caulking and joining two superposed metal plates, wherein a pair of opposing ejecting rolls and receiving rolls are provided for sandwiching the two superposed metal plates. And a pair of a roll having a protruding portion and a cylindrical roll that face each other and that are arranged in tandem with the pushing / bending / rolling roll to pass through the metal plate. The ejection roll comprises a flat bending-back roll, and the ejection roll is formed by inserting two notch lines of an appropriate length substantially in the metal plate feed direction into the two overlapped metal plates to form a plate thickness between the notch lines. Equipped with two or more cutting edges on both sides and cutting edges on both sides, the tip surface of which is concave, the receiving roll is provided with cutting edges corresponding to the cutting edges on the left and right of the protruding blade. The outer periphery of the roll with a protrusion has a cutting edge, and a receiving groove having a convex bottom surface that forms a gap of not more than two plate thicknesses with the concave tip surface of the protruding blade, A caulking and joining device for a metal plate, characterized in that it has a projecting portion having a flat tip surface capable of pressing the portion between the cut lines.