JPS63286232A - Production of driving plate - Google Patents

Abstract

PURPOSE:To form a tooth part having less dispersion in the dimension and of high accuracy by bending the upper side part by constraining the lower side of the same shape part by a constraining ring by forming the outer periphery of circular plate in cup shape with its drawing and subjecting a tooth part to plastic forming by forming the lower side part in a quaduplicate wall thickness part with its bending. CONSTITUTION:A cup-shaped can 1 is formed by drawing a disk, the lower side 2a of the peripheral wall part 2 is constrained by the constraining ring 4 having a fixed height and the upper side is bent by a punch 5, mandrel 6 and die 7. After adhering an upper side peripheral wall part 2b with its bend, the constraining ring is taken off to bend the lower part thereof and a quaduplicate wall thickness part is made by adhering to the bottom face part in cup shape. A tooth part is plastically formed by a rolling stage on this wall thickness part. The bending position at the upper side peripheral wall part is thus fixed, similarly the dispersion of the lower side bending part is reduced and the generation of a defective split and underfill in forming a tooth profile can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing thin, large-diameter gears by press-forming thin steel plates, and the present invention relates to a method for manufacturing thin, large-diameter gears for use in automobile torque converters. This method is used as a manufacturing method for drive plates.

(Prior art) As shown in FIG. 5, the prior art related to the present invention includes:
The conventional drive plate A has a ring-shaped thick walled part 14 and a disk-shaped plate part 15 integrated by welding.
The plate part 15 is formed by press working, and the thick part 14
After coiling, a rectangular rod is formed into a ring shape, a tooth shape is formed on the outer peripheral surface, and the plate and the ring-shaped gear are welded together.
are joined and integrated.

Furthermore, as shown in FIGS. 6 and 7, as a related technique, the outer circumferential portion of a circular thin steel plate is bent into a cup shape by press working, and the cup-shaped circumferential wall portion is bent by a bending process to make it adhere to the bottom wall portion. There is a method of manufacturing a drive plate by thickening the outer periphery and forming a tooth profile on the thick outer periphery (Japanese Patent Application No. 61-204324).

(Problems to be Solved by the Invention) However, when manufacturing a drive plate by bending the peripheral wall of the cup-shaped can, as shown in FIG. The thickness of the cup-shaped peripheral wall is increased due to the free bending position of the thin steel plate.

Due to variations in work hardening, etc., B or single-dot chain &
As shown by iC, the bending position is easy to change, and the variation in the outer diameter dimension after adhesion causes a difference in the outer diameter dimensions of P and P2 as shown in Fig. 7, which causes problems in gear rolling forming in the subsequent process. However, there is a problem in that flames are likely to occur due to poor cutting at the thick outer peripheral portion.

The present invention forms a cup-shaped can by pressing a disc material, bends the peripheral wall of the cup-shaped can to form a thick part, and when forming the tooth part, the thick part on the outer periphery may not be cut properly. The technical challenge is to manufacture dimensions of drive plates that do not cause underfilling.

[Structure of the invention]

Measures for solving problem C) The technical measures taken to solve the above problem are as follows. That is, in the method of manufacturing a drive plate from a disc material, (1) the outer periphery of the disc is bent into a cup shape using a drawing tool, and (2) the bending process is carried out on the upper and lower sides of the cup-shaped peripheral wall. (3) As a lower bending process, the lower outer diameter of the cup-shaped peripheral wall is restrained by a restraining ring of appropriate size and the upper side of the peripheral wall is bent; (3) as a lower bending process, the lower side of the peripheral wall is bent (4) Plastically form the teeth on the thick part using a gear rolling device. Drive by the above method. It manufactures plates.

(Operation) The technical means operates as follows. In other words, since the lower circumferential wall of the cup-shaped can is restrained by a restraining ring and the upper circumferential wall is bent, the variation in the dimensions of the bending position is reduced, and then in order to bend the lower circumferential wall, a quadruple bending section is required. The unevenness in the large diameter dimension of the thick-walled portion is extremely reduced, and when the tooth portion is formed by plastic working, there is no occurrence of poor cutting or lack of thickness in the thick-walled portion of the outer periphery. - (Example) An example will be described below.

A cup-shaped can 1 is formed by drawing a disc material using a press, as shown in FIG. 2 is a peripheral wall portion, and 3 is a bottom wall portion.

FIG. 2 shows the bending process of the circumferential wall of the cup-shaped can according to the present invention, which includes two steps: an upper bending process and a lower bending process. The side portion 2a is restrained by a restraint ring 4 having a constant height and bent by a punch 5, a mandrel 6, and a die 7.

FIG. 3 shows the die 7, the restraint ring 4, and the punch 5 in which the upper peripheral wall portion 2b is bent and brought into close contact.

Next is restraint ring 4! If the lower portion 2a of the peripheral wall portion 2a is bent in the same manner as described above, the peripheral wall portion is bent four times to form a thick wall portion 8, as shown in FIG.

In the process of bending the upper side of the peripheral wall, by restraining the lower side of the peripheral wall with a restraining ring that would damage certain dimensions and press working, the bending position is constant and does not vary due to bending the upper peripheral wall. Similarly, even if the restraining ring is removed and the lower side of the peripheral wall is bent, there will be less variation in the lower bent part, and therefore there will be no variation in the dimensions of the thick-walled, large-diameter part. There is no occurrence of poor cutting or lack of thickness when forming the tooth profile.

When using the restraint ring shown in Figure 2, the height of the restraint ring is H, the upper bending position is Hu, and the upper bending position where the conventional restraint ring is not used as shown in Figure 6 is the natural bending position. If Hw4, then Hu = Hw x 1.
O~0.6 is suitable.

FIG. 8 is a graph showing the relationship between the Hu/Hw and the variation in the thick-walled, large-diameter portion, where Hu/Hw = 60
% indicates the least variation, and 10
If it exceeds 0%, the variation becomes large.

〔Effect of the invention〕

The present invention has the following effects. In other words, by restraining the lower side of the peripheral wall with a restraining ring and bending the upper part, and then bending the lower part in the next process, the thickness of the cup-shaped peripheral wall remains constant regardless of the thickness of the cup-shaped peripheral wall, work hardening of the material, etc. Even if a quadruple-folded thick part is formed because it is bent at a certain position, the variation in the dimension of the thick part in the thickness direction is reduced, and the tooth part can be formed with high accuracy.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the cup-shaped can with some parts omitted, Fig. 2 is a cross-sectional view during bending using a restraining ring, Fig. 3 is a cross-sectional view of the upper part of the surrounding wall after bending is completed, and Fig. 4 is a cross-sectional view of the surrounding wall. part 4
Fig. 5 is a cross-sectional view of the conventional example, Fig. 6 is a cross-sectional view of the conventional example.
The figure is a sectional view of a conventional example formed from a cup-shaped can, Figure 7 is an explanatory diagram of the difference in the large diameter part occurring in the process of Figure 6, and Figure 8 is a diagram showing the ratio of Hu / Hw and the large diameter dimension. It is a graph showing variation. ■...Cup-shaped can. 2.2a, 2b...peripheral wall portion. 4...Restraint ring

Claims (1)

[Claims] In a method for manufacturing a drive plate, which is a large-diameter gear with a thick outer circumference and a thin center part, from a disk in a bending process, (1) the outer circumference of the disk in a drawing process; (2) In the bending process, the upper and lower sides of the cup-shaped side wall are bent separately, and as the upper bending process, the lower outer diameter of the cup-shaped peripheral wall is adjusted to an appropriate size. (3) In the lower bending step, the lower side of the peripheral wall is bent to make it tightly contact with the cup-shaped bottom to form a quadruple thick part; (4) Rolling In the manufacturing process, teeth are plastically formed on the thick portion of the disk using a gear rolling device. A method of manufacturing a drive plate using the above method.