JPS6284846A - Manufacture of drive plate - Google Patents

Abstract

PURPOSE:To form as one body a thin plate part and a thick wall tooth profile part without requiring the welding working by superposing a necessary part to the outside periphery of a disk having a limited plate thickness and converting it to a thick wall, and rolling a tooth profile by a plastic deformation. CONSTITUTION:In a blanking process, a blank 1 is obtained by punching a disk whose plate thickness is 2.0-3.0mm. Subsequently, in the first drawing stage, a doughnut type cut shape 2 having an inside tapered part 2a and an outside tapered part 2b is formed by bending the outside periphery of the blank. Next, in the first necking stage, the side wall part is bent 4a to the inside. Next, by an adherence stage, the side wall part is bent double and brought to adherence forming as shown by 6a. Next, in the second drawing stage, a cup shape 8 whose side wall part has a double thickness 8a is formed. Also, in the second necking stage, the side wall part is bent 10a to the inside. Next, in the adherence, forming and punching stages, a thick wall part 12a is formed by bending triply the outside peripheral part of a blank 12. In this state, a tooth part 14a is formed on the outside periphery of the blank by a gear form- rolling device.

Description

Detailed Description of the Invention (Objective of the Invention) (Industrial Field of Application) The present invention relates to a method for manufacturing thin, large-diameter gears by press-forming thin steel plates, and As shown in FIG. 16, the prior art related to the present invention is as follows.
The conventional drive plate consists of a ring-shaped thick part 20 and a disc-shaped plate part 21, and the plate part 21 has a diameter of 2.0
It is formed by press processing from a plate material with ~3.0 fin, and the thick part 20 has a rectangular cross section (thickness 9-10 fim x width 17-20 fim).
The bar material is coiled into a spiral shape, each coil is cut and welded to form a ring shape, and the joints are burred.
A tooth profile is formed on the outer circumferential surface using a hobbing machine or the like. In this way, the thin plate part 21 and the thick part having the teeth 22 are formed separately, and the thin plate part and the thick part with the teeth 22 are welded and joined as shown in 22 to be integrated. be.

(Problems to be Solved by the Invention) However, the method for manufacturing the drive plate requires finishing and welding of the joints in order to integrate the separate thin plate part 21 and the thick toothed part 20. This welding process tends to cause distortion, and insufficient strength due to poor welding.

In addition, in order to improve material yield for thick-walled tooth-shaped parts, rods with a rectangular cross section are coiled and formed into a ring shape, but this requires many processing steps, which, together with the welding process mentioned above, increases the overall processing cost. There is a problem.

An object of the present invention is to provide a method for manufacturing a drive plate that does not require any welding.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
Using the thin disc of the drive plate, (1) punch out the disc in the blanking process, and (2) bend the outer periphery of the disc in the first drawing process to form a donut shape consisting of an outer tapered part and an inner tapered part. (3) in a first necking step, the side wall portion is bent inward at about 45°; (4) in a close contact step, the necking portion is bent at about 45° to make it stick to the inner tapered portion; (5) in a In the second drawing process, the side wall part is made into an inverted cup shape with double thickness. (6) In the second necking process, the side wall part with double thickness is folded inward. (7) Adhesion, forming, and pilot hole. In the hole punching process, the slanted side wall part is brought into close contact with the bottom part, making the outer periphery three-layer thick.The bottom part is further formed and mounting holes are drilled, and (8) the three-layer thickness is formed in the rolling process. The tooth portion is plastically or rolled formed on the thick portion using a gear rolling device.

Through the above steps, a drive plate having teeth in the thicker portion is formed from a single thin plate.

(Operation) The technical means operates as follows. In other words, the necessary portions of the drive plate are overlapped on the outer periphery to thicken the drive plate to a predetermined dimension, and the tooth profile is formed by plastic deformation using a gear rolling machine.The thin plate part and the thick tooth profile part can be formed integrally. This eliminates the need for welding at all.

(Example) Specific examples will be described below.

1 is the same thickness as the thin plate part of the drive plate (2
, 0 to 3.0 mm).

Next, in a first drawing process, the outer periphery is bent to form a donut-shaped cup 2 having an inner tapered part 2a and an outer tapered part 2b.The mold includes a drawing punch 3a,
It is molded using a blank presser 3b, a wrinkle presser 3c, and a tapered molding die 3d.

Next, in the first necking step shown in 4, the side wall portion is bent inward to form 4a, which is molded using a mold formed by die 5a + necking punch 5b, wrinkle presser 5c, and gou cushion 5d. .

Next, in a close contact process, the side wall portion is folded twice to make a close contact as shown in 6a, and a die 7a and a close bending punch 7
b, and the mold of the blank holder 7C.

Next, in a second drawing step, a die 9a is used to form a cup shape 8 having a double thickness 8a on the side wall.

It is molded using the punch 9b and the die of the Gui cushion 9c + wrinkle presser 9d.

Furthermore, in the second necking step, the side wall portion is bent inward.
0a, die 11a, coil spring l
It is molded using a mold consisting of a slide mandrel 11C having a diameter of lb, a necking punch Ild, and a cam mandrel 11e for moving the slide mandrel.

Next, the outer periphery of the drive plate material 12 is triple-folded to form a thick wall portion 12a through the adhering, forming, and punching steps, and is molded into a mold with a die 13a, a adhesion bending punch 13b, and a blank positioning 13C. At the same time, mounting holes etc. are also formed.

Next, a toothed portion 14a is formed on the outer periphery of the drive plate material whose outer periphery has triple wall thickness using a gear rolling machine. 15d
The tooth portion 14a is formed by a gear rolling device consisting of the following.

From the thin plate 1 of 2.0 to 3.0 Tsuru by the above manufacturing method,
The thickness of the outer peripheral part is 8-Ion, and the module is 2°0-3.
A drive plate 14 having 0 teeth is formed.

〔Effect of the invention〕

The present invention has the following unique effects. In other words, there is a method of thinning the thin plate part from a thick plate material by cutting and integrating it, but this method requires a large amount of cutting, increases the processing cost, has a poor material yield, and increases the cost. There is a method for manufacturing a flywheel that bends the disk (Japanese Patent Publication No. 54-20190), but this method involves forming tooth profiles on the thick wall part in order to bend the outer circumferential part in the same direction as the axis of the disc, and use it as a large diameter gear. In this case, the overlapped plate thicknesses will be cut, and in the case of a large module tooth profile, the tips of the teeth may be cut off, and there is also a risk that the bent portion may open outward due to the rotational force applied to the gear. On the other hand, the drive plate according to this embodiment does not create a cavity inside the blank, allows the tooth bottom to be formed accurately and beautifully even during tooth profile formation during plastic working, and allows large rotational force to act on the thick wall portion. It is also a sturdy drive plate with no problems at all.

[Brief explanation of drawings]

Figures 1 to 14 show each process of this example.
The figure is a sectional view of the disc material, FIG. 2 is a sectional view of a donut-shaped cup, FIG. 1 necking process drawing, Fig. 6 is a close sectional view, Fig. 7 is a close fitting process drawing, Fig. 8 is a cup-shaped sectional view with double thickness, and Fig. 9 is a sectional view of It is a diagram of the second drawing process, and the first
Figure O is a cross-sectional view of the double side wall necked, and the 11th
The figure is a diagram of the second necking process, Figure 12 is a sectional view of the drive plate material, and Figure 13 is a diagram of the adhesion, molding,
FIG. 14 is a cross-sectional view of a drive plate formed by this manufacturing process, FIG. 15 is a diagram of a tooth forming process using a gear rolling device, and FIG. 16 is a diagram of a conventional drive plate. FIG. 3 is a partially omitted cross-sectional view of the plate.

Claims (1)

[Claims] In a method for manufacturing an automobile drive plate, which is a large-diameter gear with a thick wall at the periphery and a thin wall at the center, by pressing and rolling, A disk with a thickness of 2.0 to 3.0 mm is punched out, (2) in a first drawing process, the outer periphery of the disk is bent to form a donut-shaped cup having a tapered part, (3) in a first necking process. (4) The outer tapered side wall portion bent inward in the adhesion step is further bent to make it adhere to the tapered portion; (5) The side wall portion is bent inward in the second drawing step. (6) In the second necking step, the side wall portion with the double thickness is bent inward to form an inclined shape. (7) In the adhering, forming, and punching step, A drive plate material having a thickened outer periphery of a disk is formed by bringing the inclined side wall portion into close contact with the bottom portion, and (8) in a rolling process, the outer periphery of the drive plate material is rolled using a gear rolling machine. A method of manufacturing a drive plate by forming teeth.