JP2851684B2 - Gear rolling device - Google Patents

Description

Description: Object of the Invention (Industrial application field) The present invention relates to a gear rolling device for rolling gears, and more particularly to a device for forming a desired gear with a rotating rolling die. is there.

(Prior Art) When a gear is formed by a gear rolling device, one of a rolling die or a circular rolling material is pressed while rotating to form a tooth profile.

In the basic diagram of the roll forming shown in FIG.
When the rolled material 5a and the rolled material 5b are gradually pushed in, grooves 5c corresponding to the number of teeth are gradually formed on the outer peripheral portion of the rolled material, and a tooth shape that becomes the root portion is formed.

(Problems to be Solved by the Invention) However, since the rolling method of the tooth profile is a forming method in which one of a rolling die or a rolling material is gradually pressed in while rotating, the rolling die 5a and the rolling die 5a are increased when the pressing speed is increased. The distance between the axes of the rolled material 5b and the rolled material 5b greatly changes between the initial stage and the final stage, so that the pitch of the groove changes.

Also, even if the splitting is successfully performed, a change in the pitch of the groove causes an imbalance in volume between the tooth profiles.

As a result, as shown in FIG. 6, the underfill generated at the tip of the toothed portion 6a becomes large, the dimensional accuracy of the gear becomes poor, the load applied to the rolling die becomes excessively large, and the rolling die is easily damaged. There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of forming a gear by using a gear rolling device, in which a pitch is not displaced at the time of initial dividing and a dimensional accuracy of the formed gear is good. .

[Configuration of the invention]

(Means for Solving the Problems) A technical means taken to solve the problems is a gear rolling device that pushes and rotates a rolling die into a rolling material to form a desired tooth profile on the outer periphery of the material. , A dividing process of forming a certain amount of grooves on the outer periphery of the material, and a tooth profile for forming the desired tooth shape by rotating the material or the rolling die while pressing a rolling die into the divided material until a desired tooth shape is formed. And a molding step.

(Effect) The gear rolling device is a splitting step of forming a fixed amount of groove on the outer periphery of the material, and rotating the material or the rolling die while pushing the rolling die into the cut material until a desired tooth shape is formed. And a tooth forming step of molding a desired tooth profile, so that a correct splitting process can be performed on the outer periphery of the material by the splitting process, and a good volume balance without occurrence of a pitch shift at a constant groove depth can be obtained. After forming the uniform grooves, the rolling dies are pushed into the cut material with the inter-axis distance being free, so that the desired tooth profile can be correctly formed.

Example An example will be described below.

The present embodiment is intended to accurately perform the initial splitting of the rolling, without rotating the rolling die 1a into the rolling material 1b as shown in FIG. 1 and pushing a fixed amount of 0.3 to 0.5 mm. A groove 1c is formed, and then the rolling material 6 or the rolling die 1a is rolled to form a groove on the outer periphery of the rolling material with a uniform pitch, and then the rolling die is further pushed in to form a tooth profile. A good tooth profile can be obtained without any displacement or pitch difference.

FIG. 2 shows a basic example of the present embodiment, in which a die cylinder 2f is advanced by a hydraulic cylinder 2c using a hydraulic mechanism, and a rolling die 2a forms the groove 1c in a rolling material 2b. The valve 2d is operated, the die holder 2f is stopped, and simultaneously the rolling material or the rolling die is rotated to form the groove 1c uniformly on the outer periphery of the rolling material.After that, the valve 2b with a center block is operated to operate the die. The holder 2f is advanced to obtain a tooth profile.

However, in this device, when a rolling die hits the rolling material or when a groove is formed on the outer periphery, the load fluctuates, and the die holder 2f is returned and the groove 1c may not be formed uniformly. is there.

FIGS. 3 and 4 show a splitting mechanism of the rolling device in order to solve the problem.

In FIG. 3, the die holder 3f is connected to a hydraulic cylinder.
An operation of pushing the tooth profile to the place where the tooth profile is to be formed by 3c is performed, but in the middle, that is, where the rolling die 3a hits the rolling machine 3b and obtains the groove 1c, the die holder 3f hits the wedge-shaped stopper 3e and stops. Rolled material
By rotating the rolling die 3b or the rolling die 3a, the groove 1c is uniformly formed on the outer peripheral portion of the rolling material. Next, the hydraulic cylinder 3d is operated to release the wedge-shaped stopper 3e. The die holder 3f, which has been stopped by this release, moves forward to form a tooth profile to obtain a good tooth profile.

In FIG. 4, the rolling die 4a is pushed into the rolling material 4b by the hydraulic cylinder 4d by the hydraulic cylinder 4d until the groove 1c is formed, and at the same time, the rolling material or the rolling die is rotated to remove the groove 1c. Formed uniformly on the outer periphery of rolled material.
4e is a stopper. Thereafter, the die holder 4f is pushed to a position where a predetermined tooth profile is obtained by the hydraulic cylinder 4c to obtain a good tooth profile.

(Effects of the Invention) As described above, according to the present invention, it is possible to perform a proper dividing on the outer periphery of the material by the dividing step, and obtain a good volume balance with a constant groove depth and no pitch deviation. After forming the uniform grooves, the rolling dies are pushed into the cut material with the inter-axis distance being free, so that the desired tooth profile can be correctly formed.

Furthermore, since the rolling dies are loaded with a constant groove depth and a good volume balance with no displacement of the pitch, load fluctuations become uniform and the life is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a basic example of this embodiment, FIG. 2 is an explanatory view of this embodiment, FIGS. 3 and 4 are explanatory views of another embodiment, and FIG. 5 is an explanatory view of a conventional example. FIG. 6 is an external view of a tooth profile in the case of the conventional example. 1a, 5a …… Rolling die, 1b, 5b …… Rolled material, 1c, 1d ……
Split grooves.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshikuni Kamiya 11 Nodamachibawari, Kariya City, Aichi Prefecture Aisin Toyoyo Co., Ltd. (72) Inventor Yuji Sakabe 11 Nodamachibawari, Kariya City, Aichi Prefecture Aishi Examiner Osamu Kawabata within Toyohyo Co., Ltd. (56) References JP-A-1-218733 (JP, A) JP-A-1-159942 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B21H 5/00

Claims (1)

(57) [Claims] 1. A gear rolling device for forming a desired amount of grooves on the outer periphery of a material by using a gear rolling device which presses and rotates a rolling die into the material to form a desired tooth profile on the outer periphery of the material. A tooth forming step of rotating the material or the rolling die while pressing a rolling die into the material until a desired tooth shape is formed, thereby forming a desired tooth shape. .