JPH0734968B2 - Caulking joining method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to caulking joining of thin plates, and more particularly to a method of caulking joining thin plates suitable for assembling caulking parts and preventing swaging of caulked products.

[Conventional technology]

The conventional dowel removal method is disclosed in JP-A-54-17587 and JP-A-58-47518.
The dowels for positioning and electrode contact as described in (3) above. However, this dowel requires a caulking pin or the like to obtain the volume required for caulking, and the caulking point was not considered. In the case of a swaged product that requires a swivel stop, two or more swaged points have been used.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the cost of parts and the caulking work are not taken into consideration, and the cost of parts is high, and there are problems in the caulking work such as positioning of the caulking product at the time of caulking and inserting the caulking pin.

In addition, a pin having a cross section other than a circular shape is difficult to obtain as a part because it has a special shape, and a device for positioning is required when automatically supplying it to the caulking device, which increases the cost of production equipment. There is a problem.
Further, even if the positioning device is provided, there is a problem that it takes time for positioning and the speed of the caulking work cannot be increased.

An object of the present invention is to form a small-diameter dowel having a plate thickness of a material to be processed, and by inserting the dowel into a caulking hole having a shape that prevents rotation of the dowel formed in the caulking material, An object of the present invention is to provide a caulking joining method capable of reliably fixing even a small component directly to a caulking member.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a recess formed in the vicinity of the center of the processing position on one surface of a flat plate-shaped workpiece in the caulking joining method. It has a first die, a recessed portion that is arranged facing the first die and is formed in the vicinity of the center of the processing position on the other surface of the workpiece, and a projection that is formed around this recessed portion. A first punch is provided, and the first die and the first punch are pressed from both sides of the work piece by a press to form a protrusion in the vicinity of the center of the processing position of one surface and processing of the other surface. The first step of forming a concave portion at a position and forming a surplus portion in the vicinity of the central portion of the concave portion, and the concave portion formed in the vicinity of the central portion of the processing position of one surface of the workpiece and the center of the concave portion. A second die formed and having a cylindrical recess having a first diameter; A second punch having a conical recess formed in the vicinity of the center of the processing position on the other surface of the workpiece and facing the die, and a protrusion formed around the recess. The second die and the second punch are pressed from both sides of the work piece by a press to press the excess thickness portion formed by the first step by the protrusion of the second punch to make a second press. A second step of forming a solid cylindrical protrusion protruding into the cylindrical recess of the die and protruding from the protrusion, and forming a conical excess portion on the other surface;
A third die having a recess formed near the center of the processing position on one surface of the workpiece and a cylindrical recess formed at the center of the recess and having a second diameter larger than the first diameter. And a conical protrusion formed in the vicinity of the central portion of the processing position on the other surface of the workpiece, facing the third die, and a protrusion formed around the protrusion. And a third die and the third die from both sides of the work piece.
Of the third die is pressed by a press to press the conical extraneous portion formed in the second step with the conical protrusion of the third punch to form a recess on the other surface and A solid dowel for caulking is formed by projecting into a cylindrical recess and forming a large diameter portion on one surface between the protrusion and the solid cylindrical protrusion to form a step with the tip being a small diameter portion. A third step of
A large diameter portion of the solid caulking dowel formed in the third step in the caulking hole of the caulking material having a diameter larger than the second diameter and having a shape that prevents rotation of the dowel. And a fourth die having a conical protrusion formed in the vicinity of the center of the processing position on one surface of the workpiece,
A third punch is provided, and the fourth die and the third punch are pressed by a press from both sides of the work material, and the depression formed in the third step is pressed by the conical protrusion of the third punch. The fifth step is characterized in that the small diameter portion of the solid crimping dowel formed in the third step is pressed and deformed by the conical protrusion of the fourth die to perform the crimping.

[Action]

Since the build-up can be formed on the surface opposite to the surface on which the dowel is formed in the first step and the second step, it is possible to secure a sufficient amount of meat to form the dowel. In the third step, this sufficient meat can be used to form dowels. This allows
It is possible to form a solid dowel with a diameter as small as the thickness of the workpiece.
In the fourth step and the fifth step, the caulking is performed by following the caulking hole having a shape that prevents the rotation of the dowel, so that the caulking material can be prevented from rotating. Further, the dowel can function as a crimping pin, and the crimping pin can be eliminated. As a result, even a small component can be reliably fixed directly to the caulking member.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The formation of the crimping dowel will be described with reference to FIGS. 1 and 2. FIG. 1 shows a cross section of an example of a component formed by a caulking doweling process. 2 (a) (b)
Each of (c) shows a dowel removal process in this embodiment.

In this embodiment, the crimping doweling process is shown in FIG.
The steps (b) and (c) are performed in this order. In the figure, 1 is a work material, 2a, 2b and 2c are punching punches respectively, and 3a, 3b and 3c are dies corresponding to the punching punches 2a, 2b and 2c respectively.

The doweling process in this embodiment divides the process into a plurality of processes,
The die has a mold structure in which the work material is punched to a volume larger than that required for dowel forming and the surplus thickness is left in the center of the dowel forming to reduce deformation of the work material and reduce the meat required for dowel forming to the next step. It is the one to be left.

In the present embodiment, the doweling process on the work piece 1 is performed in three steps shown in FIGS. 2 (a), (b) and (c). In the first step, the punch 2a and the die 3a are used to form the first forming part 4 in the vicinity of the center of the processing position of the work material, and the second forming parts 5, 3 Molding part 6
The extra-thickness portion 8 having a volume necessary for forming the is formed. Second
In the second step, the columnar second molding portion 5 is formed in the center of the first molding portion 4 by the punch 2b and the die 3b. Second
In forming the molding portion 5, the punch 2b presses the extra thickness portion 8 to push out the meat corresponding to the volume of the second molding portion 5 to the first molding portion 4 side. As a result, the volume of the extra thickness portion 8 is reduced, and the crushed portion 7 is formed on the contact surface of the punch 2b. In the third step, the punch 2c and the die 3c
The surplus portion 8 left in the second step is extruded toward the first molding portion 4 side, and the third molding portion 6 is formed between the first molding portion 4 and the second molding portion 5. In the present embodiment, the recess 9 is formed after the excess thickness portion 8 is extruded by the punch 2c. Third
The forming part 6 is formed in a cylindrical shape having a diameter larger than that of the second forming part 5, whereby the caulking dowel 10 having a step is formed.

In the present embodiment, the rising dimension of the crimping dowel 10 is set to the workpiece 1
The thickness is set to 1.4 to 1.6 times. That is, the sum of the rising dimensions of the second molding portion 5 and the third molding portion 6 is the workpiece 1
1.4 to 1.6 times the plate thickness of.

According to this embodiment, as compared with the conventional one in which caulking is performed using a pin, a drilling step for a workpiece, a pin supply device,
Since the device for inserting the pin into the hole of the workpiece and the device for crimping the pin and the workpiece are unnecessary, the dowel for crimping can be formed only by pressing, so that the cost of the production facility can be reduced. Further, since the dowel for caulking is formed directly from the work material, quality control such as the diameter and length of the pin is unnecessary, and the production control can be simplified.

Next, regarding the step of caulking using this dowel, the third step
This will be described with reference to FIGS.

The crimping dowel 10 formed on the workpiece 1 is crimped 20
It is inserted into the hole 11 formed in the and is caulked by the steps shown in FIGS. 4 (a) to 4 (c). In this embodiment, the diameter B of the hole 11 is 0.1 mm larger than the diameter A of the crimping dowel 10. The caulking process will be described with reference to FIGS. The dowel 10 of the work piece 1 is the hole of the caulking material 20
In the state where the dowel 10 is fitted and inserted, the back side of the dowel 10 is pressed by the punch 2c as shown in FIG. 4 (a). Next, as shown in FIG. 4 (b), the die 3d rises from below, the dowel 10 is crushed and deformed, and the caulking material 20 is caulked to the material 1 to be processed. Next, as shown in FIG. 4 (c), punch 2c and die
3d goes up and down respectively, and the caulking work is completed.

In order to prevent the caulking portion from rotating, the caulking hole may have a shape other than a circular shape. FIG. 5 shows an example in which the caulking hole is an elliptical hole 12. In this example, the caulking dowel 10 is inserted into the caulking hole 21 of the caulking material 21 as shown in FIG. 10A, and caulking is performed, but the caulking hole 21 has the dowel size as shown in FIG. It is formed as an elliptical hole which is larger than A by 0.1 mm in B dimension and 0.2 mm in C dimension. The caulking is performed in the steps of FIGS. 4 (a) to (c), and when the dowel is caulked, the dowel is deformed according to the elliptical hole of the caulking hole 21,
The caulking shape becomes an ellipse, and the caulking joint at one place can also function as a whirl stop.

Note that the hole shape is not limited to an ellipse, and may be a square, a rectangle, a triangle, a cross hole, or the like.

〔The invention's effect〕

According to the present invention, by forming a solid dowel having a small diameter of about the plate thickness of the workpiece, and inserting the dowel into the caulking hole having a shape that prevents rotation of the dowel formed in the caulking material ,
It is possible to obtain a caulking joining method capable of reliably fixing even a small component directly to a caulking member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a part in which a crimping dowel is formed according to an embodiment of the present invention, and FIGS. First
Sectional view of process, sectional view of second step, sectional view of third step,
FIG. 3 is a side view of the work material and the caulking material showing the relationship between the diameter of the dowel and the caulking hole diameter, and FIGS. 4 (a), 4 (b) and 4 (c).
Is a cross-sectional view showing the first step, the second step, and the third step of the crimping step in the present embodiment, respectively, and FIG. 5 (a) is a work material showing a configuration for preventing the crimping portion from rotating in the present embodiment. And FIG. 5 (b) is a plan view of the caulked material. 1: Work material, 2a, 2b, 2c, 3a, 3b, 3c, 3d: Press, 8: Extra thickness part, 10: Dowel for caulking, 11, 12: Caulking hole, 20, 21: Caulking material

Claims (1)

[Claims] 1. A first die having a concave portion formed in the vicinity of a central portion of a processing position on one surface of a flat plate-shaped workpiece, and the workpiece which is disposed so as to face the first die. A first punch having a recess formed near the center of the processing position on the other surface of the material and a protrusion formed around the recess is provided, and the first die and the first die are provided from both sides of the material to be processed. The first punch is pressed by a press to form a protrusion in the vicinity of the center of the processing position of the one surface, and a recess is formed in the processing position of the other surface, and a surplus is formed in the vicinity of the center of the recess. A first step of forming a portion, a concave portion formed in the vicinity of the central portion of the processing position on one surface of the workpiece, and a cylindrical concave portion formed at the center of the concave portion and having a first diameter. A second die having the second die and the other surface of the workpiece which is disposed so as to face the second die. A second punch having a conical recess formed near the center of the processing position and a protrusion formed around the recess is provided, and the second die and the second punch are provided from both sides of the workpiece. The punch is pressed by a press to press the extra thickness portion formed in the first step by the protrusion of the second punch to protrude into the cylindrical recess of the second die. The second step of forming a solid cylindrical protrusion protruding from the protrusion and forming a conical excess portion on the other surface, and the vicinity of the center of the processing position on one surface of the workpiece. A third die having a concave portion formed in the first concave portion and a cylindrical concave portion formed at the center of the concave portion and having a second diameter larger than the first diameter, and arranged to face the third die. And the conical protrusion formed near the center of the processing position on the other surface of the workpiece. A third punch having a protrusion formed around the periphery of the work piece, and formed by the second step by pressing the third die and the third punch with a press from both sides of the work material. The conical excess portion is pressed by the conical protrusion of the third punch to form a recess on the other surface of the third punch, and the concave portion is protruded into the cylindrical concave portion of the third die so that A third step of forming a large-diameter portion on the surface between the protrusion and the solid cylindrical projection to form a solid caulking dowel having a step whose tip is a small-diameter portion; A large size of the solid caulking dowel formed in the third step in the caulking hole of the caulking material having a diameter larger than 2 and having a shape for preventing rotation of the dowel. The fourth step of inserting the diameter portion is performed, and it is formed in the vicinity of the center portion of the processing position on one surface of the workpiece. A third die having a conical protrusion and a third punch, and pressing the fourth die and the third punch with a press from both sides of the workpiece to perform the third step. The depressions formed by the third punch are pressed by the conical protrusions of the third punch, and the small diameter portion of the solid caulking dowel formed by the third step is pressed by the conical protrusions of the fourth die. A caulking joining method comprising a fifth step of deforming and caulking.