JPH0368770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for fixing plate-like members, particularly plate-like members such as metal plate frames and chassis.

(Prior art) Two plate members 10 and 11 as shown in FIG.
As a method of joining and fixing them at their overlapping surfaces 12, the methods shown in FIGS. 2 to 4 are conventionally known.

In FIG. 2, a through hole 15 is previously formed in the first plate member 13 by press working. A second plate member 14 that can be plastically deformed is superimposed on the first plate member 13, a die plate 16 as a pedestal is placed under the first plate member 13, and the second plate member 14 is placed on top of the first plate member 13. A punch 17 is placed above the member 14 and on the center of the through hole 15. Then punch 1 as shown in Figure 3.
7, the second plate member 14 is punched in a punching state. Through this operation, the material of the second plate-like member 14 is deformed and press-fitted into the through-hole 15 of the first plate-like member 13 so that it is filled in. Plate member 1
It has the same volume as the punch hole 18 formed in 4 (see FIG. 4).

The cross-sectional shape of the through hole 15 differs depending on the clearance between the die plate and the punch for punching the hole and the material used, but as a general rule, the sagging surface A is about 10% of the plate thickness from the punching direction. Next, the shear plane B has a relatively smooth cylindrical surface and is about 30 to 40% of the plate thickness, and finally the fracture plane C.
is tapered and the surface is rough, approximately 50 to 60% of the board thickness.
be. In other words, since the fracture surface C of the through hole 15 of the first plate member 13 is tapered, when the material of the second plate member 14 is press-fitted, it bites into the fracture surface C.
A good fixation state can be obtained.

Moreover, what is shown in FIG. 5 is another conventional example,
In this case, a conical protrusion 19 is provided at a position corresponding to the through hole 15 of the first plate member 13 on the die plate 16a disposed on the lower surface of the first plate member 13. The fixing strength is improved by pressing the material of the second plate member 14 more strongly against the fractured surface C of the through hole 15 by the portion 19.

(Problems to be Solved by the Invention) According to the conventional example described above, the material of the second plate-like member 14 should be press-fitted so as to be in close contact with the tapered inner surface of the through hole 15. However, in reality, the volume and flow of the material are not sufficient, so the tapered shape does not expand sufficiently, especially at the fracture surface C. When the punch hole 18 is deepened in an attempt to widen the tapered shape sufficiently, the press-fitted material of the second plate member 14 breaks near the joining surface of the first plate member 13 and the second plate member 14. I had a problem with putting it away. Furthermore, in the method of poking the through hole 15 from below as shown in FIG. However, there was a problem that the fixing strength was not sufficient.

(Means for Solving the Problems) A method for fixing a plate-like member according to the present invention solves the above-mentioned problems, and is capable of plastically deforming a first plate-like member having a through-hole and capable of being plastically deformed. The second plate-like member is polymerized, and the material of the second plate-like member is press-fitted into the through-hole using a punch with a diameter smaller than the diameter of the through-hole, and the material of the second plate-like member is pressed into the die plate placed on the lower surface of the first plate-like member. The provided conical protrusion applies pressure around the through hole to fix the first plate member and the second plate member.

(Function) The material of the second plate-shaped member is press-fitted into the through-hole by a punch, and the first plate-shaped member is pressurized around the through-hole by a conical protrusion provided on the die plate, and the material of the first plate-shaped member is pressed into the through-hole. Tighten the material of the second plate member.

(Example) FIG. 6 shows a fixing method of the present invention, and the method of fixing a plate-shaped member according to the present invention will be explained based on FIG.

In FIG. 6, 13 is a first plate member,
A through hole 15 is provided which widens downward. Reference numeral 14 denotes a second plate-like member, which is superimposed on the first plate-like member. 16b is a die plate arranged on the lower surface of the first plate member 13, and conical protrusions 19a, 19a are provided around the through hole 15 of the first plate member 13.
17 is punch.

As shown in FIG. 6, the punch 17 is lowered to deform the material of the second plate member 14 and
3, the first plate member 13 is pressed into the through hole 15 by the second plate member 14 pressed by the punch 17.
is pressed downward, and the protrusion 1 is formed on the first plate member 13.
9a and 19a bite. Therefore, the first plate member 1
The material No. 3 is pushed in the direction of the through hole 15 so as to sandwich the through hole 15, and tightens the material of the second plate member 14 that is press-fitted into the through hole 15. Projection 19a, 1
The amount of material of the first plate member 13 pushed in the direction of the through hole 15 by 9a is particularly large on the lower surface side of the first plate member 13, and the amount of material of the second plate member 13 tends to be insufficient on the lower surface side. The material of the second plate member 14 and the through hole 15 are maintained in a tightly fitted state by compensating for the shortage of the material of the second plate member 14.

(Effects of the Invention) Since both the material of the second plate-like member and the material of the first plate-like member are deformed, there is no need to forcefully deform the material compared to the case where only one plate-like member is deformed. No cracks or breakage occur in each plate member. Further, at each part inside the through hole, the material press-fitted into the through hole and the inner wall of the through hole press against each other relatively uniformly and firmly, so that the two plate-like members are firmly fixed.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing an example of an overlapping state of two plate members to which the fixing method of the present invention is applied, FIGS. 2 to 5 are cross-sectional views showing the conventional fixing method, and FIG. 6 FIG. 2 is a sectional view showing a fixing method according to the present invention. 13...First plate member, 14...Second plate member, 15...Through hole, 16b...Die plate, 1
7...Punch, 19a...Protrusion.

Claims (1)

[Claims] 1. A second plate-like member that can be plastically deformed is superposed on a first plate-like member that can be plastically deformed and has a through-hole, and the material of the second plate-like member is punched with a punch having a diameter smaller than the diameter of the through-hole. is press-fitted into the through-hole, and a conical protrusion provided on a die plate disposed on the lower surface of the first plate-like member presses the circumference of the through-hole, so that the first plate-like member and the A method for fixing a plate-like member, comprising fixing a second plate-like member.