JPS59225838A - Forming method of ring gear - Google Patents

Abstract

PURPOSE:To form efficiently a ring blank material to an internally and externally toothed ring gear by indexing and forming the tooth profile of a prescribed number of teeth to the blank material between internal and external gear forming mandrels then rolling the tooth profile with finish internal and external forming tools while controlling the position of the blank material. CONSTITUTION:A blank material is forged to a ring shape B smaller than the finish inside and outside diameters. The ring material B is put betwen inside and outside gear forming mandrels 1 and 2 and the preliminary tooth profile of a prescribed number of teeth is indexed and formed. While the ring material A' is held and controlled in the position of guide tools 6' and guide stanchions 7, the material is finish formed to a prescribed diameter and a prescribed tooth profile by means of a gear cutting mandrel 5 and a gear cutting tool 6. The internally and externally toothed ring gear A is efficiently formed by rolling without machining.

Description

[Detailed description of the invention] The present invention relates to a method for forming a ring gear.

The molding of ring gear A as shown in Fig. 1 is as follows.

Mechanical processing is the mainstream method. For machining only the external teeth of some small parts.

The manufacturing process includes the GroTi method shown in Figure 2, the rack type tool method shown in Figure 3, the two-tool blade type shown in Figure 4 or the three-tool blade type shown in Figure 5, and the WPM method shown in Figure 6.
There are methods etc. For machining internal teeth, there are the internal gear tool method shown in Figure 7 and the tooth profile segment method shown in Figure 8.

However, the machining methods shown in FIGS. 2 to 8 have the disadvantage that only one of the internal teeth or the external teeth can be processed.

In view of the above-mentioned conventional method, the present invention provides a ring gear forming method in which both the internal and external teeth are simultaneously formed, instead of machining the ring gear A and rolling only the teeth on one side. .

Embodiments according to the present invention will be described below based on the drawings.

FIG. 9 shows the process of manufacturing a ring gear according to the present invention.

Figure 9 (,) shows the U cumulative month. The material B is formed into a ring part H as shown in Figure 9 (1) by cutting, machining or turning.Then, proceed to molding using the preform/forming machine x shown in Figure 9 (c). Here, one of the three jigs for forming external teeth arranged at equal angles around the mandrel 1 for forming internal teeth is called forming jig R2 with a broken tooth profile.

The other two are guide rollers 3° and 4 for ensuring the circular diameter. These are almost the same as the outer diameter DI and inner diameter d of the ring-shaped material B formed by the preform molding machine.

Since only the number of teeth is determined here, the same tooth profile as the mandrel 1 is placed on the inside of the ring-shaped material B, and the same tooth profile as the forming jig 2 is placed on the outside of the ring-shaped material B.
It is stamped between.

During this stamping, the mandrel 1 and the two forming jigs are moved slightly in the direction of compression. Preform material B
′ is slightly outer diameter due to compression.

Although this is thought to cause a change in the inner diameter, this amount can be almost ignored since the amount of compression is minute.

However, there may be slight variations depending on the dispute.

The guide rollers 3 and 4 quickly move when a force exceeding a predetermined pressure is applied to change the diameter.

It is controlled so that the preform material B' can be moved sequentially so as to form a circular shape.

This control can also be performed using hydraulic or mechanical position control.

It does not break even with load control.

Next, as shown in FIG. 9(c), the preform material B' has a predetermined number of teeth on the inside and outside, and a tooth profile is engraved thereon.

Preform molding machine x”: Exit and move to ring gear molding machine Y. Here, a gear cutting mandrel 5 is provided on the inner tooth side of the preform material B', and a gear cutting tool 6 is provided on the outer diameter side, respectively.
The preform material B' is placed between them. The teeth are formed by rolling the gear cutting drill 5 + gear cutting tool 6.

Cut the inner teeth with a thinning tooth cutting mandrel 5.

External teeth can be processed (rolled) at the same time using the gear cutting tool 6.

During the forming of the teeth, as the teeth are formed on the inner and outer sides of the ring material, the diameter and inner diameter of the ring material change.Due to the compression process, the outer and inner diameters gradually change. In other words, the inner diameter 'I of ring part B
+ outer diameter r) and the inner diameter '2+outer diameter D2 of ring gear A is d2) dl+n2) Dl.

As this outer diameter changes, the gear cutter 6 is rotated 120 degrees left and right.
The guide tool 6' located at is moved. The guide column 7 also moves at the same time. This guide tool 6' is also formed with the same teeth as the gear cutting tool 6, so that the formed teeth are not damaged when guiding the ring material A' into a circular shape.

Note that the teeth of the guide tool 6' also play the role of lapping and fine adjustment of the teeth formed by the gear cutting tool 6. The guide tool 6' is controlled by the same mechanism as the guide rollers 3 and 4 of the preform molding machine X, and may be controlled by either load control or position control.

The guide post 7 is still provided to prevent the ring material A' from being deformed (oval, etc.) and is not directly involved in shaping the teeth. The control of this guide column 7 is also similar to that of the guide tool 6'.

As can be seen from the following explanation, the present invention uses a preform molding machine to determine the same number of teeth on the inside and outside of the ring, and then uses a gear cutting mandrel for molding the internal teeth and a gear cutting mandrel for forming the external teeth. The biggest feature is that the internal and external teeth are simultaneously formed using a forming gear cutting tool, and the ring is guided by guide rollers to prevent deformation.

Ring gear A, which is a molded product made from ring material, has an outer diameter of
The inner diameter is also larger. Regardless of the inner and outer diameters of the raw ring material, it is possible to process a ring gear A with a larger inner and outer diameter.

In addition, since the volume of the ring gear and the material need to be the same, it is necessary to manage the addition of the elements 4' and I to the 11-td vehicle M. Here, when first calculating the number of teeth in the preform molding machine X by the amount corresponding to the expansion of the number of teeth in the preform molding machine X, it is necessary to make the pitch smaller than the tooth pitch of the finished product by the amount of expansion. be. If the teeth are suddenly cut using a forming machine without determining the number of teeth, the pinch of the teeth will change as the inner and outer diameters increase, making it impossible to form the desired teeth. Due to stiffness, the teeth are indexed at a small pitch so that the preform molding machine will not be able to handle the problem, and the teeth will be pinched when completed.

As explained above, according to the present invention, the internal teeth and the external teeth can be formed simultaneously, so that the processing efficiency is significantly improved.

[Brief explanation of drawings]

Figure 1 shows a ring gear to which the present invention is applied //11
FIG. 151 and FIGS. 2 to 8 are explanatory diagrams showing examples of conventional gear forming, and FIG. 9 is a diagram showing an example of the present invention. A...Ring gear, B...Ring parts, 1...Mandrel, 2...Forming jig, 3, 4...Guide roller. 5... Gear cutting mandrel, 6... Gear cutting tool. Figure 1 Figure 37 Figure 4 Figure 57 Continuation of page 1 (, 7 ■ Inventor Kenichi Amemiya 3000 Tana, Sagamihara City Mitsubishi Heavy Industries, Ltd. Sagamihara Works (Inventor Kenichi Inamura 3000 Tana, Sagamihara City) Address Mitsubishi Heavy Industries, Ltd. Sagamihara Works 209-

Claims (1)

[Claims] After indexing and molding predetermined teeth on the inner and outer peripheries of the material using a mandrel for forming internal teeth provided inside the ring-shaped material and a jig for forming external teeth provided opposite to the mandrel on the J side, The method is characterized in that, while controlling the position of the crucible, internal tooth forming tools having the same tooth shape as the mandrel and the jig are brought close to each other from the inside and outside of the material and rotated twice. Ring gear forming method.