JP3100903B2 - Method and apparatus for processing helical gear using press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical gear processing method and apparatus, and more particularly, to a helical processing method and apparatus using a press machine to enhance productivity.

[0002]

2. Description of the Related Art Conventionally, for example, in a torque converter of an automobile, ten or more high-precision helical gears are used as planetary gears. Here, in order to reduce the noise generated from the gear, it is desired to increase the accuracy of the helical gear. As a processing method for improving the accuracy of the helical gear, (1) a shaving finishing method for a gear in which hob processing or the like is meshed with a shaving cutter and rotated by meshing with the shaving cutter material;
(2) A lap finishing method of a gear that meshes a helical gear material with a lap gear and pours a lapping agent into the meshing portion to finish the gear; (3) a grinding finishing method of finishing the helical gear material by a gear grinder; (4) There is a hydraulic rolling method in which a helical helical gear having a helical gear for rolling formed using a hydraulic device is engaged with a helical gear material to finish the helical gear.

[0003]

However, in the shaving finishing method, the lap finishing method, and the grinding finishing method, the accuracy of the gears is improved, but the processing time takes 1 minute or more per piece, which increases the cost. There's a problem. In addition, even if the hydraulic rolling method is used, since hydraulic operation is used,
The limit is to produce 3 or 4 pieces per minute, so that cost reduction cannot be realized very much.

An object of the present invention is to provide a helical gear machining method capable of manufacturing tens of helical gears per minute with high accuracy.

[0005]

According to the present invention, there is provided a helical gear machining apparatus using a press machine according to the present invention, wherein (a) a helical gear rolling device is fixed to a lower die of the press machine. A first lotus barrack with a forming die formed thereon,
(B) a second helical rack formed with helical gear rolling dies held vertically movable with respect to a lower die of the press machine, and (c) rotatably held by an upper die of the press machine, (D) when the upper die approaches or separates from the lower die by operating the press machine, the second hasbarracks are formed by the pinion gears. , Move in synchronization with the first hasbarracks.

In the helical gear machining apparatus using a press machine according to the present invention, the helical gear, which is a material to be processed, is formed by moving the press machine up and down. And the amount of rolling is 2.5 times or more.
Further, a helical gear machining apparatus using a press machine according to the present invention is characterized in that, in the above-described apparatus, angles of attack are formed at ends of the first helical bark and the second helical bark.

Next, a method of manufacturing a helical gear using the apparatus having the above configuration will be described. (1) Since the processing method of the present invention is a finishing method of a helical gear, as a material to be processed, a helical gear material having an almost finished size is processed by hobbing or the like and supplied to the present apparatus. That is, when the press machine is at top dead center,
The helical gear material is mounted and fitted between the first helical gear and the second helical gear at a position coaxial with the pinion gear. Here, both the first helical bark and the second helical bark have an inclined angle at their ends, so that it is easy to mount the helical gear material. On the other hand, the root portion and the tip portion of the involute gear tooth profile of the helical gear material to be processed are formed smaller than the standard tooth profile, and the central portion of the tooth is formed larger than the standard tooth profile.

[0008] (2) After the helical gear material is mounted, the operation of the press machine causes the upper press die to approach the lower press die. At this time, it is held rotatably by the press upper mold,
The pinion gear fitted with the first hasbarrack receives a rotational force from the first hasbarrack. At the same time, the pinion gear transmits its rotational force to the second hasbarrack. The second hasbarrack receives the rotational force and moves in the direction of the lower die. Thus, the second hasbarrack moves in a direction approaching in synchronization with the first hasbarrack. Then, the helical gear material sandwiched between the first helical bark and the second helical barr is rolled and finished as a helical gear. That is, in this rolling step, the extra flesh of the central portion of the material helical gear is moved to the root portion and the tooth tip portion, whereby a standard tooth-shaped helical gear is formed.

(3) While the press machine operates from the top dead center to the bottom dead center, the helical gear material meshes with the first helical bark and the second helical bark at least once. Then, while the press machine operates from the bottom dead center to the top dead center, the helical gear material is engaged with the first helical gear and the second helical gear again. In particular, when the press machine moves up and down, the amount of rolling between the first helical barracks and the second helical barracks and the helical gear material as the workpiece is reduced by 2.5.
If the number of times is more than the number of times, a high-precision helical gear can be formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described in detail with reference to the drawings. First, the helical gear material A used will be described. Helical gear material A
Are manufactured in advance in the same shape as a standard helical gear using a hobbing machine or the like. That is, the helical gear material A is J
Manufactured with tooth profile and tooth streak accuracy of IS standard class 4 or JIS standard class 5. The helical gear processing apparatus using the press machine of the present embodiment is a processing method performed to finish the helical gear material A and finish it to JIS standard class 2 or JIS standard class 3.

Next, a helical gear machining apparatus using a press machine will be described. 1 and 2 show the configuration of an upper die and a lower die attached to a press machine. 1 is a front view, and FIG. 2 is a side view. Since the press machine uses a general-purpose press machine driven by a motor crank,
Detailed description is omitted. A column 12 is fixed to a press upper die 11 of a press machine. A rotation center shaft 12a is provided at the tip of the support, and a pinion gear 13 as a helical gear is rotatably held. On the other hand, press lower mold 2
1, a holding member 22 and a slide holding member 24 are fixedly provided at positions facing each other across the pinion gear 13.

As shown in FIG. 1, a first helical bar rack 2 having helical gear rolling dies formed on a holding member 22 is provided.
3 is fixed. Further, a second helical rack 25 having a helical gear rolling die formed thereon is held by the slide holding member 24 so as to be slidable in the vertical direction. The first hasbarracks 23 and the second hasbarracks 25 are shown in FIG.
As shown in the figure, the pinion gear 1
3 is fitted. The tooth accuracy of the helical gear rolling dies formed on the first helical barr 23 and the second helical barrack 25 is finished to approximately JIS standard 0 class or JIS standard 1 class. At the ends of the first hasbarracks 23 and the second hasbarracks 25, escape portions 25 having an inclined angle are provided.
a is formed. Since the relief portion 25a is formed, the mounting and dismounting of the helical gear material A is easy.
The helical gear material A is mounted at the position shown in FIG. In FIG. 1, the helical gear material A is omitted. In addition, the interval between the first helical barrack 23 and the second helical barrack 25 is set in accordance with the finishing state of the helical gear material A in the previous process.

The rolling dies for the helical gear formed on the first helical bar 23 and the second helical bar 25 are:
Tooth profile accuracy, tooth streak accuracy, single pitch between each tooth ridge, cumulative pitch, etc. are all manufactured with high accuracy. In addition, the surface roughness of the tooth hills is also beautifully finished. In addition, if crowning is required for the tooth profile of the helical gear, it is necessary to engrave the crowning shape on the rolling die in advance, and by this treatment, the helical gear processing method using a press machine is performed. When the rolling process is completed, the crowning process is simultaneously completed on the helical gear, resulting in a great cost advantage.

Next, a processing method for manufacturing a helical gear using a helical gear processing apparatus using a press machine having the above-described configuration will be described. (1) As shown in FIG. 1 and FIG. 2, when the press machine is at the top dead center, the helical gear material A
Between pinion 2 and second hasbarrack 25 and pinion gear 1
Attach and fit at a position coaxial with 3. Here, since both the first helical barr 23 and the second helical barrack 25 have an escape portion 25a at the end, the helical gear material A can be easily mounted. On the other hand, the root portion and the tip portion of the involute gear tooth profile of the helical gear material A as a workpiece are formed smaller than the standard tooth profile, and the central portion of the tooth is formed larger than the standard tooth profile.

(2) After the helical gear material A is mounted,
The operation of the press machine causes the upper press die 11 to approach the lower press die 21. At this time, the pinion gear 13 rotatably held by the press upper die 11 and fitted to the first hasbar rack 23 receives a rotating force from the first hasbar rack 21. At the same time, the pinion gear 13 transmits the rotational force to the second hasbar rack 25. Second Hasbarraq 25
Moves in the direction of the press lower mold 21 along the slide holding member 24 under the rotational force. Thereby, the second hasbarracks 25 move in a direction approaching each other in synchronization with the first hasbarack 23. At this time, the speed and the moving distance of each of the first hasbarracks 23 and the second hasbarracks 25 are exactly the same.

Then, the helical gear material A sandwiched between the first helical gear 23 and the second helical gear 25 is rolled and finished as a helical gear. That is, in this rolling process, the extra flesh of the central portion of the material helical gear A is moved to the root portion and the tooth tip portion, thereby forming a standard tooth-shaped helical gear. As a result, a part of the involute curve of the tooth surface of the helical gear material A formed in the previous step is forged and formed, and a highly accurate helical gear can be manufactured.

(3) While the press machine operates from the top dead center to the bottom dead center, the helical gear material A meshes with the first helical bar rack 23 and the second helical bar rack 25 at least once. Then, while the press machine operates from the bottom dead center to the top dead center, the helical gear material A is engaged with the first helical gear 23 and the second helical gear 25 again. Helical gear material A
Is lowered by forward rotation from the top dead center to the bottom dead center, and is reversed from the bottom dead center to the top dead center to be processed again. As a result, it is possible to process by the length of the slide length of the press machine,
The stroke distance of the press machine can be set small.

In particular, if the amount of rolling between the first helical barrack 23 and the second helical barrack 25 and the helical gear material A to be processed is set to 2.5 times or more by the vertical movement of the press machine, A precision helical gear can be formed. Therefore, when using a general-purpose press machine, there is a limit to the stroke length of the press machine.
Requires a press machine stroke length of 30 mm.
When the stroke length of the press machine is required to be 250 mm, the pressurizing capacity of the general-purpose press machine is generally set to 200 tons. However, the pressurized tonnage required in the helical gear processing method using the press machine of the present embodiment is 20 to 30 tons at most. In the helical gear processing method using this press machine, since processing is performed in a cycle of a general-purpose press, it is possible to process 40 to 50 helical gears per minute.

In the above process, the helical gear material A is
When the accuracy is about JIS standard 4 to 5 grade, it is difficult to finish it to JIS standard 0 to 1 grade. Therefore, once the helical gear material A is the material, the helical gear processing method using the press machine is performed once,
Improve accuracy up to 2nd and 3rd grade. Then, when quenching is performed, the distortion lowers the accuracy by the first and second grades according to JIS standards. After the quenching, the helical gear processing method using the press machine is performed again, whereby a high-precision helical gear of JIS standard class 2 or 3 can be continuously produced. When the accuracy after quenching is JIS standard class 4-5, the helical gear material is finished once by performing a helical gear processing method using a press machine in the state of the helical gear material, and then quenched. Just good.

In order to produce a helical gear with higher precision, it is necessary to perform a helical gear machining method using a press machine again after quenching. However, since the helical gear machining method using a press machine has high production efficiency, the cost effect is very small even if the helical gear machining method using a press machine is performed twice.

As described above in detail, according to the helical gear processing method and the apparatus using the press machine of the present embodiment, (a) the helical gear is fixed to the press lower die 21 of the press machine and is rolled. A first helical bark 23 on which the dies for forming are formed; and (b) a second helical barrack 25 which is movably held in the vertical direction with respect to the lower press die 21 of the press machine and on which the dies for forming helical gear rolling are formed. (C) a pinion gear 13 that is rotatably held by the press upper die 11 of the press machine and is fitted to the first hasbar rack 23 and the second hasbar rack 25, respectively; (d) the press machine is operated by the operation of the press machine. When the mold 11 approaches or separates from the press lower mold 21, the pinion gear 13 causes the second helical bark 25 to move in synchronization with the first helical bark 23, and Helical gear material A that have sandwiched between the click 23 and the second Hasubarakku 25 is rolling,
Since the helical gear is finished as a helical gear, a helical gear with high speed and high precision can be manufactured.

In particular, a helical gear material A as a material to be processed
The root and tip of the involute gear tooth profile of
Since the tooth is formed smaller than the standard tooth profile and the central portion of the tooth is formed larger than the standard tooth profile, in the rolling process, the excess flesh of the central portion of the helical gear material A moves to the root portion and the tooth tip portion. As a result, a helical gear having a standard tooth profile can be formed.

The processing method and apparatus according to the present invention are not limited to the above-described embodiment, but can be applied to various applications. For example, in the present embodiment, the first hasbarracks 23
The second hasbar rack 25 and the pinion gear 13 are installed on the press upper mold 11 side, however, the same is true even if they are replaced.

[0024]

According to the method and the apparatus for processing a helical gear using a press machine according to the present invention, (a) a first helical bar rack fixed to a lower die of a press machine and having a helical gear rolling die formed thereon; (B) a second helical rack 25 having a helical gear rolling die formed to be vertically movable with respect to the lower die of the press machine, and (c) rotatably held by the upper die of the press machine. (D) when the upper die approaches or separates from the lower die by the operation of the press machine, the second hasbarracks are formed by the pinion gears. However, it moves in synchronization with the first helical barrack, and the helical gear material sandwiched between the first helical bark and the second helical barr is rolled and finished as a helical gear, High precision helical gears can be manufactured at low cost in speed.

[Brief description of the drawings]

FIG. 1 is a front view showing a main configuration of a helical gear machining apparatus using a press machine according to an embodiment of the present invention.

FIG. 2 is a side view of a helical gear processing apparatus using a press machine.

[Description of Signs] 11 Upper press die 12 Post 13 Pinion gear 21 Press lower die 22 Holding member 23 First helical barr 24 Slide holding member 25 Second helical barr A Husbar gear material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21H 5/02 B21H 5/00 B23P 15/14

Claims (6)

(57) [Claims] 1. A first helical rack fixed to a lower die of a press machine and having a helical gear rolling die formed thereon, and a first helical gear roll held movably in a vertical direction with respect to the lower die of the press machine. Helical gear processing using a press machine having a second helical bar on which a forming die is formed, and a pinion gear rotatably held on an upper die of the press machine and respectively fitting with the first helical bar and the second helical bar. Using the device, by the operation of the press machine, when the upper die approaches or separates from the lower die, the pinion gear causes the second hasbarracks to move in synchronization with the first hasbarracks, A method of processing a helical gear using a press machine that manufactures a helical gear by rolling a material sandwiched between the first helical bark and the second helical bark. Law. 2. The method according to claim 1, wherein when the press machine moves up and down, a rolling amount between the first helical bark and the second helical bark and a helical gear which is a material to be processed is 2 mm. A helical gear machining method using a press machine, wherein the method is performed 5 times or more. 3. The method according to claim 1, wherein the root portion and the tip portion of the involute gear tooth profile of the helical gear material to be processed are formed smaller than the standard tooth profile. Is formed larger than the standard tooth profile, and in the rolling step, the excess meat of the central portion moves to the root portion and the tip portion to be formed into the standard tooth profile. A helical gear machining method using a press machine. 4. A first helical bar rack fixed to a lower die of a press machine and having a helical gear rolling die formed thereon, and a helical gear roll held movably in a vertical direction with respect to the lower die of the press machine. And a pinion gear that is rotatably held on an upper die of a press machine and that respectively fits the first hasbarrack and the second hasbarrack. When the upper die approaches or separates from the lower die, the pinion gear causes the second helical bark to move in synchronization with the first helical barr, thereby forming a helical gear using a press machine. apparatus. 5. The apparatus according to claim 4, wherein when the press machine moves up and down, the amount of rolling between the first helical bark and the second helical bark and the helical gear as the workpiece is reduced by 2 mm. A helical gear machining apparatus using a press machine, wherein the number of times is 5 or more. 6. A helical gear processing apparatus using a press machine according to claim 4, wherein angles of attack are formed at ends of the first helical bark and the second helical bark. .