JPS5847533A - Press molding method of rough shape body for disk - Google Patents

Abstract

PURPOSE:To manufacture a titled disk from a material whose ductility is low, by executing the first forming of a dome-like projecting part having a specified diameter and radius of curvature by drawing using a male die and a female die, and repeating the process for pressing this projecting part by a punch by a prescribed number of times. CONSTITUTION:A high tension steel plate 1 is drawn by a punch 3 and a die 4, and the first forming is executed so that a dome-like projecting part 2 having a diameter D0 and a radius of curvature P becomes 1/5<=P/D0<=1. This dome-like projecting part 2 is turned inside out, and is supported on a supporting part 13. Subsequently, by a punch 18 on which projecting parts 18A, 18B and 18C corresponding to an ornament part 15, a rib part 16 and a nut seat part 17 are projected, pressing is repeated a prescribed number of times from the center of the top part of the projecting part 2 to the inside surface side, and a rough shape body for a disk 19 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Jin's invention discloses the ability to manufacture automobile road wheel discs from materials with low ductility.

and a female type.

However, in the press forming method according to the prior art described above, the plate thickness of the disk is reduced and ductility low is not provided, and this has led to fractures of the rolled material.

On the other hand, when forming disks with many irregularities, the reduction in plate thickness can be greatly suppressed by using a male die molding method that does not use a female die.
If the shape after the first molding is not suitable, the female mold in the next process -
The rough shape was not made by molding without the blank, and sufficient excess material was secured for subsequent processes.

If such a rough form for a disk is pressed firmly in the finishing process, it will cause partial trapping, overhang deformation, and a large reduction in plate thickness, resulting in breakage and holes, and no female mold in the intermediate process. may not be able to demonstrate its effectiveness.

This invention was proposed in view of the above circumstances, and its purpose is to obtain a rough-shaped body for disks with a good surface shape using only a male mold, and to make it possible to manufacture disks with complex shapes from materials with low ductility. The present invention, which provides a press-forming method for a rough-formed body for a disk, will be explained below based on an embodiment illustrating the present invention. 3 and dice 4 ・
After P drawing forming, this high tensile strength steel plate 1 is placed on a support stand 5. At this time, it is arranged so that the dome-shaped convex surface faces upward, and the lower end portion 6 is supported by the support base 5. An opening 7 coaxial with the center line of the dome-shaped convex portion 2 is formed in the support base 5-.

(See Fig. 2) Next, use a punch 8 to press the center of the top of the dome-shaped convex portion 2 supported by the support base 5 in a direction from the outer side toward the inner side to make a dome. A recess 9 having a predetermined shape is formed in the protrusion 2 .

In this recess 9 is an ornament part 10 of the disc.

It is difficult to manufacture a disk without using a rough convex pattern for the lip portion 11 and nut seat portion 12. Therefore, the shape of the first stage is made into a dome shape, and the punch 8 is provided with recesses 8A and 8B corresponding to the ornament part 10, the rib part 11, and the nut seat part 12.

8C is formed. In such a structure, at the beginning of the process, a combination pattern of the ornament part 10 is formed as shown in FIG. 2, and at the end of the process, the lip part 11 is formed as shown in FIG. A concatenated pattern of the nut seat 12 is formed.

In this type of molding, the radius of curvature ρ of the dome-shaped convex part is also important, and if ρ is large, the concave part 9 is close to a flat-bottomed shape.
The suite patterns 10, 11, and 12 are not formed. Furthermore, if ρ is small, the top portion will break during drawing of the dome-shaped convex portion.゛Therefore, we experimentally determined ρ near the top of the tome-shaped convex portion 2 to prevent the occurrence of the above-mentioned problem, and found that if the i diameter of the dome is DO, then 115≦ρ/
]) o≦1 It has been found that it is sufficient to set (1).

If the plate thickness t is too thick, the deformation due to pressure will extend to the wide surrounding area of the protrusion 2, and the shape of the protrusion 2 will deteriorate.

Therefore, in order to prevent the above-mentioned problem, t/Do may be set as follows.

1/200≦t / D6≦1/20 ・・・・・・
(2) Next, the high-tensile steel plate l with the recess 9 formed therein is turned over and supported on the support stand 13 (see FIG. 5). This support base 13 is formed in advance in the concave portion 9j formed in the convex portion 2.
When placed on the back side, it is configured to support the top 14 of the recessed peripheral edge of the recess 9, and furthermore, a space is formed in the center. In this state, use the punch 18 to press the part that has a shallow recess in the center and constitutes a convex part when viewed from the outside from the outer side to the inner side to form the rough-formed disk body 1.
Mold 9. ζHere, the punch 18 has an ornament part 15. Convex portions 18A, 18B, and 18C corresponding to the rib portion 16 and the nut seat portion 17 are provided in a protruding manner.

Here, depending on the number of times of pressing and the degree of compression depth, it is not necessary to change the holding table individually, but it is also possible to continuously form the rough shaped body 19 by replacing the front and back sides on the same support stand. . Further, a protrusion may be provided on the support base at a position opposite to the punch as a stopper for advancing the punch. Furthermore, although the rolled material was reversed in steps 8 and 8, if the position of the rolled material could be positioned, the support stand could be used without reversing the rolled material.

13 may be pushed in from above.

The thus formed rough body 19 is finished by a conventional method using a final pressing punch 20 and a die 21, including adjusting the height of the nut seat (see Fig. 7.8.9).

The finished disk 22 is attached to the central ornament part 2.
Through the hole-burring process in step 3 and the hole-drilling and coining process in the nut seat 24, the road wheel disc 25 is completed.

Since the present invention has the above configuration, it has the following effects.

(2) Obtaining a rough shaped body for a disk with a good surface shape using only a male mold makes it possible to manufacture a disk with a complicated shape from a material with low ductility.

(2) Using a high-strength steel plate with mechanical properties as shown in Table 1, a rough disk body was produced using the method according to the present invention and the method according to the prior art, and the results shown in Table 2 were obtained.
゛Table 2゛ From Table 2 above, it is possible to reduce the ornament shoulder strain to about -10 degrees using the method according to the present invention even for materials with low ductility, which is lower than that of soft steel sheets produced using the conventional method. Considering this, it can be seen that this method is superior.

■ It is possible to press-process metals with low rolling properties by repurposing most of the conventional equipment. '■ Reducing the number of molds and frames and the wear of the same molds 4, 2 = Nini *
'-a aq Fig. 1 is a sectional view showing the drawing process, and Fig. 2 is a sectional view showing the drawing process.

Fig. 3 is a sectional view showing the second step, Fig. 4 is a plan view showing the punch, Fig. 5 is a sectional view showing the third step, Fig. 6 is a partial plan view showing the punch, and Fig. 7. , FIG. 8 is a sectional view showing the final molding process, FIG. 9 is a plan view showing the finished product, and FIG. 10 is a perspective view showing the final product.

1...□High tensile strength steel plate, 2...Dome-shaped convex portion, 3...Posite, 4...Dice,
5...Support stand, 6...Lower end periphery, 7
...Opening, 8...Punch, 8A, 8
B, 8C... ...Curved part, 9...Concave part,
10... Ornament part, 11... Reply part,
12... Nut seat part, 13... Support stand, 14... Top part, ]5... Ornament part, 16... Rib part , 17...Natsuto Kashima, 18°°°°°° Ponch, 18A, 18B
, 18C...Convex portion, I9...Rough shaped body, 20...Punch for final pressing, 21...
... Dice, 22 ... Disk, 23 ...
... Ornament part, 24 ... Nut seat part, 25
・・・・・・Disc for road wheels.

Patent applicant: Hisashi Sumitomo, agent of Yukinzoku Kogyo Co., Ltd.
Gate Knowledge Figure 5 Figure 6 Figure 7 Figure 9 Figure 4 Go to Figure 10 2

Claims (1)

[Claims] (1) A dome-shaped convex portion with a diameter Do and a radius of curvature ρ is formed on a metal plate by drawing with a male die and a female die.
1. A method for press-molding a rough-shaped body for a disk, characterized in that the rough-shaped body for a disk is formed so that ≦ρ/Do≦1, and then the convex portion formed in the previous step is obtained without a female die.