JP2890917B2 - Manufacturing method of gear with flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a flanged gear used to form a flanged gear by combining a gear material having teeth formed by extrusion and a flange material. .

[0002]

2. Description of the Related Art FIG. 7 is a view showing a gear extruder.

[0003] The extrusion molding apparatus 100 is composed of a gear material M
The upper mold 101 forming the insertion space of the above and the molding die 103 having the internal teeth 102 for tooth molding are vertically overlapped and fixed by the container 104, and these are fixed on the press bolster 105, and the mandrel 106 is coaxial. The structure is provided with an extrusion punch 107 held in a state.

In the extrusion molding apparatus 100, the gear material M is inserted into the upper mold 101 with the mandrel 106 and the extrusion punch 107 raised, and then the mandrel 106 and the extrusion punch 107 are lowered. Then, the gear material M is pressed, and the teeth are formed by the tooth forming internal teeth 102 of the molding die 103 to form a gear material M1 in the middle of molding. Further, the extrusion punch 107 is lowered to form the gear G.

[0005] An example of such a gear extrusion molding apparatus is disclosed in Japanese Patent Application Laid-Open No. 58-107213.

[0006] Conventionally, a flange material is connected to the gear formed as described above by welding or the like.
Manufactured flanged gears.

[0007]

However, in the production of the above-mentioned conventional flanged gear, for example, it is difficult to position a molded gear and a flange material with each other, and it takes time and effort to join these. There are problems such as difficulty in continuous manufacturing, and solving such problems has been a problem in improving productivity and the like.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a manufacturing method capable of continuously forming a flanged gear without using welding means. It is intended to be.

[0009]

According to the present invention, there is provided a method of manufacturing a gear with a flange, comprising the steps of: passing a gear material having a hollow hole into a mold having internal teeth for forming teeth; and passing a mandrel through the hollow hole. The gears are pressed in such a state as to form teeth on the gear material, and the gear material is plastically flowed toward a mandrel to form a non-circular cross section of the hollow hole. The gear material and the flange material are joined by inserting the boss portion of a flange material having a portion and ironing the inner peripheral portion of the boss portion, thereby solving the conventional problem. Means.

[0010]

In the method of manufacturing a gear with flange according to the present invention, after forming teeth and hollow holes having a non-circular cross section in the gear material using a molding die, a boss portion of the flange material is inserted into the hollow hole. By ironing the inner peripheral portion of the boss portion, the boss portion of the flange material is brought into close contact with the hollow hole of the gear material, and the two are joined.

In the above process, the gear material is pressed in the axial direction against the molding die, and the boss portion of the flange material is inserted into the gear material in the axial direction. In a state where the raw material and the flange raw material are arranged on the same coaxial line, the flange raw material is joined after the molding of the gear raw material by the molding die, so that the gear with flange can be formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 to 6 are views for explaining an extrusion molding apparatus applicable to the method for manufacturing a flanged gear of the present invention. In FIGS. 1 to 5, the main parts of the apparatus are bilaterally symmetric. Because of the structure, the left half or the right half of the apparatus is shown for each process.

As shown in FIG. 1 (a), the extrusion molding apparatus 1 includes a molding die 2 having tooth forming internal teeth 2a for molding a cylindrical gear, and the molding die 2 is fixed to the molding die. Is fixed on the use ring 3. In the molding die 2, a gear material M1 in the middle of molding and two molded gear materials M2 and M3 are left from the upper side by pre-processing.

The tooth forming internal teeth 2a have a shaping portion 2b extending over a length of at least two gear blanks as shown in an enlarged imaginary circle in FIG. 1 (a). Has a tapered introduction portion 2c. The molding die fixing ring 3 has a gear outlet 3a for taking out the molded gear with flange, and is fixed on a press holder 4 with bolts or the like.

A punch 5 for applying a pressing force to the gear blank (M) from above, and a hollow hole H of a smaller diameter than the punch 5 and above the gear blank (M) are provided above the molding die 2. A mandrel 6 inserted therein and an ironing punch 7 having a smaller diameter than the mandrel 6 and inserted into a boss portion of a flange material described later are coaxially arranged. The punch 5, the mandrel 6, and the ironing punch 7 are arranged so as to coincide with the center axis of the molding die 2, and are fixed to a ram of a press (not shown) and move vertically.

The horizontal cross section of the mandrel 6 has an elliptical shape as shown in FIG. 5, and a gap S1 is formed between the mandrel 6 and the perfectly circular hollow hole H of the gear material M.

Further, a material holder 8 for fixing the flange material and a knockout pin 9 protruding upward from the center of the material holder 8 are provided below the molding die 2 coaxially with the central axis of the molding die 2. It is arranged so as to form a shape. The material holder 8 includes a sub-ram outer 10 that can move up and down.
On the other hand, the knockout pin 9 is fixed to a sub-ram inner 11 that can move up and down separately from the sub-ram outer 10.

Next, a process of manufacturing a flanged gear using the above-described extrusion molding apparatus will be described.

In the initial stage, the punch 5, the mandrel 6, and the ironing punch 7 are located at the ascending limit, and the material holder 8 and the knockout pin 9 are located at the descending limit. As shown in FIG. In this state, the material holder 8
Is fixed to the flange material F. This flange material F
Has a boss B having an inner diameter smaller than the diameter of the ironing punch 7 at the center.

Next, as shown in FIG. 2C, the material holder 8 and the knockout pin 9 are simultaneously raised, so that the material holder 8 and the flange material F are formed into the molding die 2.
, And the boss portion B of the flange material F is inserted into the hollow hole H of the lower molding completed gear material M3.

Here, the formed gear material M3 is pressed by the punch 5 in the previous step with the mandrel 6 penetrating the hollow hole H, so that the outer periphery is formed by the tooth forming internal teeth 2a. Since the teeth are formed and the horizontal cross section (see FIG. 6) of the mandrel 6 is elliptical as described above, the gear material (M) is separated from the mandrel 6 when the teeth are formed. Plastic flow is performed so as to fill S1. As a result, the hollow hole H is formed in the same elliptical shape (non-circular shape) as the mandrel 6. Therefore,
When the circular boss portion B is inserted into the elliptical hollow hole H, a gap S2 is formed therebetween.

Thereafter, as shown in FIG. 2D, when the punch 5 is lowered, the mandrel 6 is inserted into the hollow holes H of the gear material M1 in the middle of molding and the completed gear material M2 in the upper stage, and The ironing punch 7 is inserted into the inner periphery of the boss B.

During this time, the completed gear material M3 is in a state of being restrained in the molding die 2, and the inner diameter of the boss B is smaller than the diameter of the ironing punch 7. -Ironing is performed in a state where the outer diameter is enlarged, the gap S2 between the inner surface of the hollow hole H and the boss portion B is filled, and both are brought into close contact with each other, and the completed gear material M3 and the flange material F are joined. Thus, a flanged gear Gf is obtained.

After the upper connection, as shown in FIG. 3E, the punch 5, the mandrel 6, and the ironing punch 7 are raised, and then, as shown in FIG. A new gear material M is set on the upper side of the intermediate gear material M1, and the punch 5, the mandrel 6, and the ironing punch 7 are lowered again as shown in FIG. 4 (g).

Then, as shown in FIG. 4 (h), the punch 7 is further lowered to form the flanged gear Gf via the plurality of gear materials (M, M1, M2) in the forming die 2. The material holder 8 and the knockout pin 9 are pushed out below the mold 2 and lowered. At this time, FIG.
In the process shown in the figure, the teeth of the uppermost gear material M are formed halfway, the teeth of the gear material M1 being formed are completely formed, and the hollow hole H is formed in an elliptical shape by the mandrel 6. The formed molding gear material M2 moves to the lower stage.

Further, as shown in FIG.
After raising the punch 5, the mandrel 6, and the punch 7 for ironing, and lowering the material holder 8 and the knockout pin 9, the knockout pin 9 is raised as shown in FIG. Is pushed out of the material holder 8 and the flanged gear Gf is taken out from the gear outlet 3a to complete a series of steps.

As described above, in the method for manufacturing a gear with a flange using the extrusion molding apparatus 1 described above, the gear material (M) and the flange material F are kept coaxially, and the teeth and the hollow hole H are formed. Alternatively, the two materials are joined by ironing, and the above-described process is repeated to form the flanged gear Gf continuously. Further, since the boss portion B is ironed in the elliptical hollow hole H, the boss portion B is also plastically deformed corresponding to the elliptical shape. The movement in the direction around the axis therebetween is more reliably prevented.

[0029]

As described above, the method of manufacturing a flanged gear according to the present invention provides a flanged gear by firmly and accurately connecting a gear material and a flange material without using conventional welding means. Can be obtained, and the teeth can be formed and the respective materials can be connected in a state where the respective materials are arranged on the same coaxial line, so that the flanged gear can be continuously formed, and the productivity can be greatly reduced. It has excellent effects such as being able to be improved.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views illustrating an extrusion molding apparatus and an extrusion molding process applicable to a method of manufacturing a flanged gear according to the present invention.

FIGS. 2 (c) and 2 (d) are cross-sectional views illustrating an extrusion step subsequent to FIG. 1 (b).

FIGS. 3 (e) and 3 (f) are cross-sectional views for explaining an extrusion step subsequent to FIG. 2 (d).

FIGS. 4 (g) and 4 (h) are cross-sectional views illustrating an extrusion step following FIG. 3 (f).

5 (i) and 5 (j) are cross-sectional views for explaining an extrusion molding step following FIG. 4 (h).

FIG. 6 is a horizontal sectional view of the mandrel and the gear material taken along line AA in FIG. 1;

FIG. 7 is a cross-sectional view illustrating a conventional gear extrusion molding apparatus.

[Explanation of symbols]

 2 Mold 2a Internal teeth for tooth formation 6 Mandrel B Boss F Flange material Gf Flanged gear H Hollow hole M, M1, M2, M3 Gear material

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-112038 (JP, A) JP-A-2-217656 (JP, A) JP-A-2-224845 (JP, A) JP-A-4- 94835 (JP, A) JP-A-4-266445 (JP, A) JP-A-56-112041 (JP, U) JP-A-62-193936 (JP, U) JP-B-3-31537 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) B21K 1/00-31/00 B21J 1/00-13/14 B21J 17/00-19/04 B21C 23/14 B21D 39/00

Claims (1)

(57) [Claims] 1. A gear material having a hollow hole is pressed into a mold having internal teeth for forming teeth with a mandrel penetrating the hollow hole to form teeth in the gear material. After the gear material is plastically flowed toward a mandrel to form a non-circular cross section of the hollow hole, the boss portion of a flange material having a boss portion is inserted into the hollow hole, and the boss is inserted. A method for manufacturing a gear with a flange, characterized in that the gear material and the flange material are joined by ironing an inner peripheral portion of the portion.