JPS62238037A - Manufacture of timing pulley - Google Patents

Abstract

PURPOSE:To reduce a pulley manufacturing cost by forming a smooth face by pressing the roll dies for slitting and for forming a belt placing part in order on the outer peripheral edge of the rotary disk made of metal, then by forming a tooth profile by a gear cutting die. CONSTITUTION:Clampers 4, 5 and die 10 are rotated by pressing the roll die 10 for slitting to the outer peripheral edge 8 of the metal disk 1 clamped by clampers 4, 5. In this case, a slit part 11 is formed on the outer peripheral edge 8. A smooth face 18 is then formed by rotating by pressing the roll die 17 having a smooth face 16 to the slit part 11 as well as clamping the disk 1 by clampers 14, 15. In succession, the pulley is completed by forming a tooth profile 22 on the smooth face 18 by a gear cutting die 21. In this way, the production cost can be reduced because of the waste of the materials being eliminated as well as the manufacture facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a timing pulley in which a tooth profile is formed on the outer peripheral edge of a single metal disc.

[Prior Art] Conventionally, timing pulleys have been manufactured using methods such as casting, cutting using a gear cutter from cast iron or a round bar, and forming a tooth profile by pressing a metal plate. It is done by etc.

[Problems to be Solved by the Invention] According to the above-mentioned conventional method for manufacturing a timing pulley, manufacturing by casting or cutting requires laborious and time-consuming manufacturing work, resulting in poor productivity and difficulty in reducing weight. Moreover, in the case of cutting, there is a problem in that chips are generated and a large amount of material is wasted. Furthermore, in the case of the method of forming the tooth profile by pressing a metal plate, there is a problem in that it is difficult to achieve accuracy.

This invention provides a method for manufacturing a timing pulley aimed at solving the above problems.

[Means for Solving the Problems 1] In the method for manufacturing a timing pulley according to the present invention, first, a metal disc is clamped from both sides by clampers, and a roll die for slitting is attached to the outer peripheral edge of the metal disc. Press and rotate to slit from the outer periphery toward the center to form a slit.

Next, a roll die for forming a belt hanging portion is pressed against the slotted portion from the outer periphery and rotated to form a smooth surface on the outer periphery.

Next, a gear cutting die is pressed against the smooth surface from the outer periphery and rotated to form a tooth profile on the smooth surface.

[Example] Hereinafter, this invention will be described in detail based on an example shown in the drawings.

FIGS. 1 to 7 show steps for implementing the present invention.

First, as shown in FIG. 1, a circular plate 1 is punched out of a steel plate by press working or the like. At this time, if necessary, use the disk 1
A hole 3 into which the post 2 is attached is formed in the center of the hole 3, and the post 2 is attached to the hole 3.

Next, the metal disc l is clamped by clampers 4 and 5. The clampers 4 and 5 each have a relief part 6, which allows the outer circumferential edge to expand when the outer circumferential edge of the disk l is slotted using a slitting roll die, which will be described later.
7 is formed (Figure 2).

A slitting roll die 10 having a square-shaped blade part 9 on one circumference is pressed against the outer peripheral edge 8 of the disc 1 clamped by the clampers 4 and 5, and the clampers 4 and 5 and the slitting roll are pressed together. By rotating the dice 10,
The outer peripheral edge 8 of the disk l is slotted into two parts to form a V-groove-shaped slotted part 11 (FIG. 3).

Next, the disk l having the slotted part 11 formed on the outer peripheral edge 8 is expanded by a roll die for forming a belt hanging part, which will be described later, to support the slotted part 11 of the outer peripheral edge 8, which will be expanded to form a smooth surface. A clamper 14.A clamper 14.A clamper 14.A support portion 12.13 is formed.
15 (Fig. 4).

The slotted portion 11 of the disc l clamped by the clamper 14, 15 in this manner has a smooth surface molded part 16 orthogonal to the disc l on the circumference for forming a belt hanging part having a substantially square cross section. Push the roll die 17 from the outer periphery,
By rotating the clampers 14, 15 and the roll die 17 for forming the belt hanging portion, the slotted portion 1 of the disc l is formed.
1 is expanded to form a smooth surface 18 on the outer periphery of the disc 1. Reference numeral 19 denotes flanges formed on both sides of the smooth surface 18 (FIG. 5).

Next, the southern part 20 of the gear cutting die 21 having the southern part 20 on the circumference
is pressed from the outer periphery against the smooth surface 18 formed on the outer periphery of the disk l, and by rotating the clamper 14.15 and the gear cutting die 21, the smooth surface 18 formed on the outer periphery of the disk l is toothed. A tooth profile 22 is formed by the southern part 20 of the cutting die 21 (FIGS. 6 and 7).

In this way, the tooth profile 22 is formed on the outer periphery of the metal disc l, and the timing pulley is completed.

[Effects of the Invention] As described above, in the method for manufacturing a timing pulley according to the present invention, a metal disc is clamped from both sides by clampers, and a roll die for slitting is attached to the outer peripheral edge of the metal disc. Press and rotate to slit from the outer periphery towards the center, then press and rotate a roll die for forming the belt hanging part from the outer periphery to the slit to form a smooth surface on the outer periphery, then from the outer periphery to the center. By pressing a cutting die against a smooth surface and rotating it, a tooth profile is formed on the outer periphery of the metal disc, making it easy to manufacture, eliminating waste of material, reducing weight, and achieving high precision. This has the effect that timing pulleys can be obtained at low cost.

[Brief explanation of drawings]

FIGS. 1 to 7 are explanatory diagrams showing steps for implementing the present invention. 1...Metal disc, 4.5...Clamper 8...
Outer peripheral edge 10...Roll die for slotting 11...Slotting part 14.15...Clamper 17...Roll die for forming belt hanging part 18...Smooth surface, 21...Gear cutting die Patent applicant: Nikki Isneed Co., Ltd. Agent: Patent attorney Akira Otsuka Fupa No. 5r2 tQ” '/Q

Claims (1)

[Claims] A metal disk is clamped from both sides by clampers, and a slitting roll die is pressed against the outer periphery of the metal disk and rotated to slit from the outer periphery toward the center, and then from the outer periphery. A method for producing a timing pulley, which comprises pressing a roll die for forming a belt hanging part and rotating it to form a smooth surface on the outer periphery, and then pressing a gear cutting die from the outer periphery to the smooth surface and rotating it. .