JPS6324772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for fixing an appendix to a base material, which fixes the appendix to the base material in a protruding state.

For example, in the case of a ventilation fan, a shaft pin is fixed to the outer frame made of iron plate, and this shaft pin supports the shutter so that it can be opened and closed. , then insert the shaft pin into this hole, and finally swage the shaft pin to secure it. However, this method requires a large number of steps and is low in productivity, and the work of passing the shaft pin through the hole and holding it in this state while caulking is troublesome and requires a lot of effort.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for fixing an accessory material to a base material, which can automatically fix the accessory material to the base material in one step and improve productivity.

An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 6. 1 is a punch holder attached to the ram 2 of the press, 3 is this punch holder 1
A punch plate 3 is fixed to the lower part of the punch plate 3, and a punch 4 is fixed to the center of the punch plate 3. Reference numeral 5 denotes a punching die with a stripper 6 fixed to its upper part, which is supported by the punch plate 3 via a guide pin 7 so as to be movable up and down, and whose lower end in the center has a tapered diameter, for example. A bushing 9 having a punched hole 8 is fitted therein. A compression spring 10 is wound around the guide pin 7, and the punching die 5 and the stripper 6 are always pushed down to the position shown in FIG. 1 by the elastic force of the compression spring 10. Reference numeral 11 denotes a material feeding device, which automatically feeds a relatively soft punching material 13 inserted into a passage 12 between the punching die 5 and the stripper 6 in the direction of an arrow 14. On the other hand, 15 is a bolster installed on the bed 16 of the press, and 17 is a punching die 5.
This molding die is placed and fixed on this bolster 15 via a plate 18 so as to be positioned opposite to the lower part of the molding die, and the molding die 17 has a die hole 19 in the center of which has an open upper end tapered in diameter. is forming. 20 is the die hole 19 of the molding die 17
A shaft rod serving as a swaging table is fitted into the plate 18 so as to be vertically movable, and its lower portion is inserted into a holding hole 21 formed in the plate 18. 22 is a push-up shaft inserted into a stepped hole 23 formed in the bolster 15 so as to be able to move up and down; 24 is this push-up shaft 22;
The push-up shaft 22 is a compression spring that forces the upper end of the push-up shaft 22 upward.
It protrudes inward. The shaft rod 20 is supported by the upper end of the push-up shaft 22, and the compression spring 22
When pushed down by a predetermined amount against the elastic force of 4, the lower end flange 20a comes into contact with the bolster 15.

Next, the operation of the above structure will be explained by applying it to, for example, fixing a shaft pin for pivoting the shutter of a ventilation fan. That is, 25 is a base material made of, for example, an iron plate for forming the outer frame of the ventilation fan, and a small hole 26 is previously formed in this base material 25 at a portion to which the shaft pin is fixed. Then, the base material 25 is placed and set on the forming die 17 so that the small hole 26 is approximately concentric with the die hole 19, and the punching material 13 is fed by one pitch by the material feeding device 11. Material for punching 13
Set the front part of the ram 2 so that it is located directly below the punch 4 (see FIG. 1), and lower the ram 2 in this state. When the ram 2 descends by a predetermined amount, the punching die 5 presses and fixes the base material 25 onto the forming die 17, and the punching die 5 itself is prevented from descending any further. When the punching die 5 stops descending in this way, only the punch 4 continues to descend, and the punch 4 cooperates with the punching hole 8 to remove the shaft, which is an accessory material, from the punching material 13. A material 27 for forming a pin is punched out and the material 2 is
7 into the punched hole 8 (see Fig. 2). When the material 27 comes into contact with the base material 25, the material 27 receives a compressive force so that its lower end protrudes into the lower end tapered part 8a of the punched hole 8, and this protruding portion 27a When the inside of the tapered part 8a is substantially filled, the punch 4 applies all its pressing force to the base material 25, and cooperates with the die hole 19 of the molding die 17 to close the peripheral portion of the small hole 26 of the base material 25 into the die hole. Taper part 2 while bulging into 19
The cylindrical hole part 28 with 8a is drawn and formed (third
(see figure). Now, when the short cylindrical hole part 28 is completely drawn in the base material 25 as described above, the material 2
7 is extruded from the lower end opening of the cylindrical hole part 28 into the die hole 19 by the pressing force of the punch 4, and the tip part is formed into a round bar shape with a smaller diameter than the original diameter. The rod 20 is pushed down against the elastic force of the compression spring 24 and the flange 2
0a comes into contact with the bolster 15 (see FIG. 4), but since the punch 4 continues to descend by a predetermined amount thereafter, the material 27 is strongly swaged by this descent of the punch 4. That is, the punch 4 has a swaging region that is a downward stroke region from the position where the shaft rod 20 contacts the bolster 15 to the lowest position (the position shown in FIG. 5), and the shaft rod 20
When the punch 4 reaches this swaging area, it stops descending, receives the material 27, and applies the swaging force of the punch 4 to the material 27. As the punch 4 descends in the swaging area, the tip of the material 27 extruded from the cylindrical hole 28 is strongly swaged and becomes larger in diameter, completely filling the die hole 19. As a result, the cylindrical hole 28 28 is in a state where it bites into the material 27 (see FIG. 5). When the punch 4 completes the predetermined descent in this way, the punch 4
is raised together with the punching die 5 and returned to the original position shown in FIG.
4 and returns to its original position, and in the return process, the material 27 is pushed up and pulled out from the die hole 19. As described above, the material 27 is formed into a shaft pin A, and the shaft pin A is firmly fixed to the base material 25 by the biting of the cylindrical hole 28 (see FIG. 6).
Thereafter, the base material 25 is bent into a rectangular shape to form an outer frame of the ventilation fan, and the shutter is pivotally supported to this outer frame via the shaft pin A.

As described above, according to this embodiment, the punching material 13
A material 27 is punched out from the base material 25, and then a cylindrical hole portion 28 is formed by drawing the material 27 into this cylindrical hole portion 28.
The cylindrical hole portion 28 is inserted into the material 27 as the material 27 is swaged, and the material 27 and the shaft pin A are fixed to the base material 25. Each stroke is performed by one downward movement of the ram. This greatly improves productivity. In addition, since the mold requires a simple combination of a punch and die, the mold can be manufactured at low cost and equipment costs can be kept low. Of course, if a plurality of punch holes 4 and a plurality of die holes 19 are provided in the punch plate 3 and the molding die 17, a plurality of shaft pins can be fixed at the same time, and productivity is further improved. Furthermore, base material 2
When attaching a plate-shaped part to the base material 25, as shown in FIG.
This can be joined to the base material 25 at the same time as the shaft pin is fixed, and in this case, the plate member can be rotated by joining with one shaft pin and by slightly reducing the swaging force of the punch 4. It is also possible to install it on.

Note that the small hole 26 corresponding to the pilot hole of the cylindrical hole 28 may be omitted if the lower end of the cylindrical hole 28 is made to break through by the downward force of the punch 4. In addition, the lower end tapered portion 8a of the punching hole 8 has a diameter larger at the base end of the material 27 to more securely fix the material 27 and to make it easier to extract the material 27 from the punching hole 8. However, since the material 27 is originally fixed by the biting of the cylindrical hole 28, the inner diameter of the punched hole 8 (original diameter of the material 27) is set to be equal to or larger than that of the die hole 19. If so, the tapered part 8a may be omitted, and the tapered part 19a at the upper end of the die hole 19 prevents the base material 25 from being punched out by the upper end opening edge of the die hole 19, and also prevents the material 27 from being extruded. The tapered portion 19a may be omitted if the upper opening edge of the die hole 19 is slightly rounded (see FIG. 8).

Furthermore, the device according to the present invention is not limited to fixing a shaft pin to the outer frame of a ventilation fan, but may also be applied to fixing a contact 30 to a contact piece 29 of a switch, as shown in FIG. 9, for example. It can be widely applied when attaching an accessory to a base material.

As explained above, the present invention is capable of forming a cylindrical hole portion of an accessory material from a punching material into a punching base material, inserting the accessory material into the cylindrical hole portion, and fixing the same in one step. It is possible to provide a device for fixing an accessory material to a base material, which improves productivity, has a simple mold structure, and can keep equipment costs low.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal sectional view showing an embodiment of the present invention, FIGS. 2 to 5 are schematic longitudinal sectional views of main parts for explaining the process order of the embodiment, and FIG. 6 7 is a cross-sectional view showing the fixing structure of the shaft pin of the same embodiment, FIG. 7 is a cross-sectional view showing another fixing structure, FIG. FIG. 9 is a cross-sectional view of the fixing portion used when fixing a contact to the contact piece of a switch. In the figure, 4 is a punch, 5 is a punching die, 8 is a punching hole, 13 is a punching material, 17 is a forming die,
19 is the die hole, 20 is the shaft (swaging table part),
25 is a base material, 27 is a shaft pin material, 28 is a cylindrical hole portion, 29 is a contact piece (base material), 30 is a contact point (attached material),
A is the shaft pin (attached material).

Claims (1)

[Claims] 1. In a device for fixing an accessory material to a base material in a protruding state, a punching die having a punching hole, a forming die provided opposite to the punching die and having a die hole, and collaborating with the punching hole to perform the punching. After punching out the accessory material from the punching material set in the die, a cylindrical hole projects into the die hole through the accessory material in the base material set in the forming die in cooperation with the die hole. a punch that draws and forms the part and extrudes the tip of the accessory material from the cylindrical hole; and an accessory that can receive the accessory material and protrude from the cylindrical hole when the punch reaches a swaging area with respect to the forming die. A device for fixing an accessory material to a base material, comprising a swaging table portion for swaging the tip portion of the swaging part.