JPS59209449A - Rolling method - Google Patents

Abstract

PURPOSE:To work a helical gear, etc. with good accuracy and to integrate processes by working the 1st working section of a work with a pair of rolling tools, grasping at the same time the adjacent 2nd working section with other tools and working the same. CONSTITUTION:A work 10 is grasped by respective flat dies 16, 17, and while a load P is exerted thereon, the upper dies 16, 17 and the lower dies 16, 17 are moved in the directions opposite from each other. The work 10 rotates and the tooth of the dies 16, 17 bit gradually into the 1st and 2nd working sections 12, 14. As a result, helical teeth 11 are formed in the 1st working section 12 and at the same time serration 13 is formed in the 2nd working section 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming helical teeth or helical grooves such as helical grooves or oil grooves by rolling. It is about the method.

For example, as a method for manufacturing the helical gear 1 shown in FIG. 1, cutting with a hob cutter or the like or rolling may be considered, but the cutting method takes a long time and is disadvantageous.

Since the cut-off dimensions must be considered in the product, unnecessary parts become longer, resulting in larger products and higher tool costs. On the other hand, the rolling method does not cause the above problems, but because it applies a large load to the object to be rolled and plastically deforms it, sufficient accuracy cannot be achieved, especially for the small diameter helical gear 1. , due to unavoidable cutting process, helical gear 7
The reality is that they are manufacturing.

That is, when manufacturing the helical gear 1 by rolling, the object 2 to be rolled is inserted into a pair of flat dies 3. as shown in FIG.
4 and apply a load P, and in this state, each flat die 3.4 is moved in a relatively opposite direction to rotate the rolled product 2. If there is, the object to be rolled 2 and the flat die 3.
Since the number of engagements with 4 changes, a tooth trace error occurs.

FIG. 3 is a diagram for explaining the movement of the meshing point,
When the rolled workpiece 2 is at the position shown by A with respect to the flat die 3, the two are engaged at three points, 81, 82, and 83, and the rolled workpiece 2 is at the position shown at 8 in Fig. 3. When moving relative to
The other flat die 4 and the rolled object 2 engage with each other at the points.
Contrary to the case shown in FIG. 3, when the rolled objects 2 are at the position indicated by A, they engage at four points, and when they are at the position indicated by B, they engage at three points. In this way, odd-numbered tooth helical gear 1
When rolling, the number of meshing teeth and the meshing point change,
In addition, since the number of meshing teeth and the position of the meshing point are different between one flat die 3 side and the other flat die 4 side, the pressing force into the rolled object 2 by the flat die 3.4 changes. As a result, the load acting on the rolled object 2 changes and the rolled object 2 is displaced or deformed even slightly in the direction indicated by the arrow in FIG. 2, so the formed tooth trace 5 is shown in FIG. 4. The pitch interval p of the teeth in the axial direction of the rolled object 2 is as follows.
It will be in a undulating state with the same pitch as a. Such an error e
This will not occur if the displacement or deformation of the rolled object 2 can be prevented, but in order to completely prevent the displacement or deformation of the rolled object 2, the rolled object 2 must be a rigid body. is actually impossible.

In this way, in the past, due to the large tooth trace error when rolling, it was not possible to obtain a rolling amount of helical gears, etc. with a precision that could be used in practical use, and as a result, in many cases, helical gears, etc. were manufactured by cutting. The reality is that they are being manufactured.

Further, for example, since a helical gear is used by being assembled to other components such as a casing or a shaft like other various mechanical parts, it is common that screws, serrations, etc. are formed integrally with the helical gear.

However, in the past, especially small-diameter helical gears were processed using specialized machine tools such as hobbing machines, and it was not possible to process threads, serrations, etc. using the same machine, so there were at least two steps required to obtain the final product. need,
Some kind of improvement is desired in terms of process consolidation and rationalization.

This invention was made in view of the above circumstances, and an object of the present invention is to provide a rolling method that can process helical gears and helical grooves with high precision, and also that can integrate processes. It is. In other words, this invention
A first machining part of the workpiece is sandwiched between a pair of rolling tools and a helical tooth or helical groove is machined, and at the same time, a second machining part adjacent to the first machining part on the same axis is machined. , characterized in that the second working part is subjected to plastic working by inserting another pair of tools from substantially the same direction as the rolling tool and sandwiching the second working part, Therefore, according to this invention, by sandwiching the second machined part with the other pair of tools, it is possible to suppress the fluctuation of the workpiece caused by rolling helical teeth or helical grooves, and therefore the workpiece is The tooth trace error of the workpiece can be minimized, or helical teeth or helical grooves can be machined simultaneously with threads, serrations, etc. using a pair of other tools.
This makes it possible to centralize the processing process.

The present invention will be described in more detail below based on examples.

FIG. M5 and FIG. 6 are schematic views showing an embodiment of the present invention, in which a workpiece 1o includes a cylindrical first processing portion 12 for forming a helical tooth 11, and a first processing portion 12 for forming a helical tooth 11. A cylindrical second processed portion 14 having the same diameter as the first processed portion 12 and for forming the serrations 13 is formed adjacently on the same axis. The workpiece 10 is rotatably supported by a pair of centers 15 as shown in FIG. At the same time, each of the second processing parts 14 formed on the left and right sides of the first processing part is
It is sandwiched between a pair of flat dies 17 for serration rolling. In that case, if the flat dies 16 for helical tooth rolling are arranged on both the upper and lower sides of the workpiece 10 as shown in the figure, the flat dies 17 for serration rolling are similarly arranged on both the upper and lower sides. In addition, in order to smoothly perform rolling, each of these flat dies 16 and 17 has a series of teeth on the end side that start biting into the workpiece 10 as a group of biting teeth in which only the teeth gradually become higher. A configuration in which the teeth are a finished tooth group with regular tooth depth and tooth thickness, and the series of teeth on the end side where the meshing with the workpiece 10 is disengaged is a relief tooth group in which only the teeth are gradually lowered. Preferably.

While the workpiece 10 is sandwiched between the flat dies 16.17 as described above and a load P is applied, the upper flat dies 16.17 and the lower flat dies 16.17 are They are moved in opposite directions as shown by the arrows in Figure 6. By moving each flat die 16.17 in this manner, the workpiece 10 is rotated, and the teeth of each flat die 16.17 are aligned with each of the first and second processing portions 12.
．． 14, and as a result, helical teeth 11 are formed in the first processed portion 12, and at the same time, serrations 13 are formed in the second processed portion 14.

While rolling in this way.

When forming an odd number of helical teeth 11, the number of teeth and the meshing point where the upper and lower helical teeth rolling flat dies 16 meet the workpiece 10 change as described above, and therefore Although the load condition on the workpiece 10 fluctuates repeatedly, in the above rolling method, the second processing section 14 which is integral with the first processing section 12
Because the flat die 17 for serration rolling bites into and restrains the flat die 16 for helical tooth rolling and the workpiece 1.
Fluctuations in the workpiece 10 due to changes in the number of meshing teeth and the meshing point with 0 are suppressed. Therefore, in the above method,
Since the relative displacement between the workpiece 10 and the helical tooth rolling flat die 1G is extremely small, the helical tooth 11 of the workpiece 10
The tooth 11 can have high precision with almost no waviness.

In addition, in the above embodiment, the case where the serrations 13 are machined on the second machined part 14 has been explained as an example, but in this invention, in addition to serrations, threading or knurling can also be applied to the second machined part 14. In short, the workpiece 10
It is sufficient that the second processed portion 14 is subjected to processing that penetrates into the second processing portion 14 and causes plastic deformation. In addition, in this invention, it is not necessary to provide the second machining part 14 on both the left and right sides of the first machining part 12, and if the axial length of the second machining part 14 is long, etc., the fluctuation of the workpiece can be sufficiently suppressed. , the second processing section 14 may be provided only on either the left or right side of the first processing section 12, or only one second processing section 14 may be processed. Furthermore, the first processing section 12 and the second processing section 14 do not necessarily have to have the same diameter, and the mutual speeds of the die for helical tooth rolling and the die for processing the second processing section 14 may be different. If possible, the first processed portion 12 and the second processed portion may have different outer diameters. Furthermore, the dice used in this invention are not limited to flat dies, but round dies may also be used. Furthermore, a helical groove may be formed in the first processed portion 12 outside the helical tooth portion.

As is clear from the above description, in the method of the present invention, the first processing portion of the workpiece is sandwiched between a pair of rolling tools to form helical teeth or helical grooves, and at the same time, the first processing portion is machined by a pair of rolling tools. A pair of tools are inserted into a second processing part adjacent to the part on the same axis from approximately the same direction as the rolling tool, and the second processing is performed while sandwiching the second processing part. Since this is a method of applying plastic working to a part, the second processing part is pinched by the other pair of tools.
It is possible to suppress the variation of the workpiece caused by rolling helical teeth or helical grooves, thereby minimizing the microscopic error in the workpiece, thereby obtaining highly accurate helical teeth or helical grooves. In addition, the process can be integrated because the helical teeth or helical grooves and the threads, serrations, etc. can be processed simultaneously using another pair of tools.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a helical gear, Fig. 2 is a schematic front view for explaining a helical gear rolling method, and Fig. 3
The figure is an explanatory diagram to explain changes in the number of meshing teeth and the meshing point between the rolled object and the flat die, Figure 4 is a schematic diagram of the waviness that occurs on the tooth surface of the rolled object, and Figure 5 is a schematic diagram of this. A schematic cross-sectional view for explaining one embodiment of the invention, FIG. 6 is VI of FIG.
-Vl line arrow sectional view. 10... Workpiece, 11... Helical tooth, 12...
・First processing part, 13... Serration, 14.
...Second processing part, 16...Flat die for helical tooth rolling, 17...Flat die for serration rolling. Applicant Toyota Motor Corporation Kobe Steel, Ltd. Agent Patent Attorney Yutaka 1) Hisashi Take (and 1 other person) Figure 1/1 Figure 2 Figure 5 Continued from page 1 0 Inventor Kei Yamazaki Bunmei Seki City 179-1 Kanegasaki-Nishi-Inuike, Uozumi-cho, Kobe Steel, Ltd., Akashi Plant 0 Author: Takuji Moriguchi, Akashi City, Uozumi-cho, Kanegasaki-Nishi-Inuike, 179-1, Kobe Steel, Ltd., Akashi Plant Applicant: Kobe Steel, Ltd. Tokoro 1-3-18 Wakihama-cho, Chuo-ku, Kobe City

Claims (1)

[Claims] When forming helical teeth or helical teeth on a cylindrical workpiece by rolling, the 1″5! workpiece is
A first machining area where teeth or helical grooves are to be formed and a second machining area where a suitable tool is to be machined are provided, and the first machining area is clamped by a pair of rolling tools. When rolling a helical tooth or a helical groove, another pair of tools are inserted into the second processing part from approximately the same direction as the rolling tool to form the second processing part. A rolling method characterized by not performing plastic working on the outer circumferential surface of the second processed portion while sandwiching the material.