JPH03243239A - Manufacture of pawl member - Google Patents

Abstract

PURPOSE:To work a die small in pressure, simple in structure and long in life by upsetting a member divided in volume into a part to be a boss part, a part to be a main member body and bulged parts to be pawl parts in forming stages. CONSTITUTION:First, the member is divided in volume into a part to be the boss part 15, a part to be the main member body 13 and bulged parts 27 to be the pawl parts 17, with a diameter part D1 considerably smaller than the external diameter of the main member body 13 and a little larger than the external diameter 23 of the slug as a boundary surface 25. Then, the part to be the main member body 13 and the bulged parts 27 only which are formed in the forming stages are upset to the thickness nearly equal to the final thickness (t) of the main member body 13. Hereafter, the tips of the bulged parts 29 are cut, formed and divided into tapered parts 31 where the tips are tapered and burred parts 33. Then, the burred parts 33 are trimmed and removed, the tapered parts 31 are bent nearly to right angle, projections are formed, sizing is performed and the external shape of the member is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a claw member, such as an alternator rotor, by cold forging.

[Conventional technology]

Conventionally, clawed members such as alternator rotors have been manufactured by a method such as that disclosed in Japanese Patent Publication No. 60-43818, for example.

FIG. 13 shows a method of manufacturing a claw member disclosed in this publication. In this method of manufacturing a claw member, a slug L cut from a round bar is preformed, and 2.3 are sequentially shaped. After this, 3 is eyeloned to form 4, 4 is molded to form 5 and a claw portion 5a having the same cross-sectional area is protruded, and then the claw portion 5a is flattened to form a claw portion 6a, and then bent. The claw portion 7a is formed by processing, and the claw member 7 is manufactured.

According to such a manufacturing method, in 5 in FIG.
Since the cross-sectional area of a is formed to be approximately constant, it is possible to perform processing with a higher yield than the conventional method, a small pressurizing force, a simple mold structure, and a long mold life.

[Problem to be solved by the invention]

In such a conventional method, as shown in 5 in FIG. 13, by forming the cross-sectional area of the claw portion 5a to be approximately constant, it has become possible to significantly reduce the molding load compared to the conventional method. Still, this step 5 requires a larger molding load than the other steps, so there is a problem that a pressurizing device with a large capacity is required.

In addition, the mold for forming the claw portion 5a shown in Figure 5 needs to have a size close to the unfolded shape of the product, and it is also necessary to fit an irregularly shaped punch and die, making it expensive. Although the mold life was longer than that of conventional molds, there was a problem that it was shorter than that of simple upsetting molds.

Furthermore, in 5 in the figure, the width of the tip of the claw part 5a is narrowed and the thickness in the height direction is increased, and in 6 in the figure, the claw part 5a is crushed to make the tip flat. There is a limit to how much the width of the tip can be narrowed, and when it is flattened, the width expands to some extent, so the problem is that it is not suitable for manufacturing a member with a claw where the tip of the claw portion 7a is extremely thin. was there.

The present invention solves the above-mentioned problems and provides a claw member that can significantly reduce the molding load compared to the conventional method, has a long mold life, and can perform high-precision molding at low cost. The purpose is to provide a manufacturing method.

[Means to solve the problem]

The method for manufacturing a claw member according to claim 1 includes, as an example of the member main body,
In the method for manufacturing a claw member, the method includes forming a boss portion having a smaller diameter than the member main body, and forming a plurality of claw portions on the outer periphery of the member main body. Forming a slag having an outer diameter equal to or slightly smaller than that of the member body, and using a diameter portion that is considerably smaller than the outer diameter of the member body and slightly larger than the slag outer diameter as a boundary surface, a portion 1 that will become the boss portion and the member body A molding process that divides the volume into a part that will become the part that will become the claw part and an overhanging part that will become the claw part, and only the part that will become the main body of the member and the overhanging part formed in this molding process are installed to a thickness that is almost the same as the final thickness of the main body of the member. The upsetting process includes an upsetting process in which the upsetting process is performed, and a bending process in which the protruding portions upholstered in the upsetting process are bent to form claw parts.

The method for manufacturing a claw member according to claim 2 includes the steps of claim 1,
The tip of the overhanging part that has been upset in the upsetting process is exposed and formed to generate burrs, and then the burrs are trimmed.

The method for manufacturing a claw member according to claim 3 includes the steps of claim 2,
Extrusion molding is performed while bending the overhanging portion at an angle of 5 degrees or more and 60 degrees or less.

[For production]

In the method for manufacturing a claw member according to claim 1, in the upsetting step where the forming load is the largest, the member is divided into volumes into a portion that becomes the boss portion, a portion that becomes the member body, and an overhanging portion that becomes the claw portion. Since the material is upsetting, it is sufficient to restrict the outer diameter during upsetting by lightly restraining only the boss part or the lower part of the overhanging part in a tapered shape, and the material is not inhibited in any way from extending radially from the center. Never.

In the method for manufacturing a claw member according to claim 2, in claim 1, the tip of the overhanging portion that has been upset in the upsetting step is exposed and formed to generate a burr, and then the burr is trimmed. This allows the tip of the claw to be formed extremely thin.

In the method for manufacturing a claw member according to claim 3, in claim 2, the extrusion molding is performed while bending the overhanging portion at an angle of 5 degrees or more and 60 degrees or less, so that the material can be stably positioned with the die, In addition, the extrusion molding load is reduced and the life of the mold is improved.

〔Example〕

Hereinafter, details of the method of the present invention will be explained using the drawings.

1 and 2 show a jawed member 11, such as an alternator rotor, cold forged by the method for manufacturing a jawed member of the present invention.
A boss portion 15 having a smaller diameter than the member main body 13 is formed on one side, and a plurality of claw portions 17 are formed on the outer periphery of the member main body 13 at a predetermined angle.

The claw portion 17 has a protrusion 1 that protrudes toward the boss portion 15 side.
9 is formed, and a through hole 21 is bored through the member main body 13 and the boss portion 15.

Such a claw member 11 is manufactured as described below according to an embodiment of the method for manufacturing a claw member of the present invention.

In this embodiment, as shown in FIG. 3, a slug 23 cut from a round bar having an outer diameter equal to or slightly smaller than the outer diameter of the boss portion 15 shown in FIG. 1 is used.

First, as shown in FIG.
The boundary surface 25 is a diameter portion that is considerably smaller than the outer diameter of the member body 13 shown in the figure and slightly larger than the slug outer diameter 23, and a portion that will become the boss portion 15, a portion that will become the member main body 13, and a claw. The projecting portion 27, which becomes the portion 17, is divided into volumes (molding process). Note that at this time, a tapered surface having an angle A is formed on the protruding portion 27.

After this, as shown in FIG. 5, only the part that will become the member main body 13 and the overhanging part 27 formed in the molding process are
Upsetting is performed to a thickness approximately equal to the final thickness t of the member main body 13 (upsetting process).

At this time, the fourth
In the molding process shown in the figure, D.

and t are selected.

Thereafter, as shown in FIG. 6, the tip of the overhanging portion 29 that has been upset in the upsetting process is exposed and formed into a tapered portion 31 and a burr portion 33 (extruded). molding process).

In addition, in this example, the extrusion molding is performed on the overhanging portion 2.
9 toward the boss portion 35 at an angle of 5 degrees to 60 degrees.

Thereafter, as shown in FIG. 7, the burr portion 33 is trimmed and removed.

After this, as shown in FIG.
5 side to form a protrusion 19 (
bending process).

Thereafter, as shown in FIG. 9, sizing processing is performed to shape the outer shape of the member.

Thereafter, as shown in FIG. 1O, a through hole 21 passing through the member main body 13 and the boss portion 15 is formed by piercing.

According to the method for manufacturing a claw member of the present invention as described above, the manufacturing process includes forming the slug 23 having an outer diameter equal to or slightly smaller than the outer diameter of the boss portion 15, and A forming process in which the volume is divided into a portion that will become the boss portion 15, a portion that will become the member main body 13, and an overhanging portion 27 that will become the claw portion 17, using a boundary surface 25 that is considerably smaller than the outside diameter of the slug 23. ,
There is an upsetting process in which only the part that will become the member main body 13 and the overhanging part 27 formed in this forming process are upholstered to a thickness that is approximately the same as the final thickness of the member main body 13, and Overhanging part 29
Since the structure has a bending process of bending the part 2 to form the claw part 17, in the upsetting process where the forming load is the largest, the part 2 that becomes the boss part 15 due to the forming process
Since the member is divided into volumes into the part that will become the main body 13 and the overhanging part 27 that will become the claw part 17, the outer diameter will be restricted during upsetting only on the boss part 35 or the lower part of the overhanging part 27. It is sufficient to lightly restrain the material in a tapered shape, and the radial extension of the material from the center is not hindered in any way, making it possible to significantly reduce the molding load compared to conventional methods, and to achieve a long mold life and low cost. High precision molding becomes possible.

In addition, the forming load in this upsetting process is based on the
This is further reduced by about 25% compared to the method disclosed in Japanese Patent No. 43818 in which the cross-sectional area of the claw portion 5a is made constant.

Further, in this upsetting process, there is no fitting between the punch and the die, and no reinforcement of the punch and the die is required, so that the life of the die can be significantly improved compared to the conventional method.

In addition, in the manufacturing method of the clawed member described above, it is necessary to fit the punch and the die in the molding process shown in FIG. 4, but in this molding process, the wall thickness 1 is large, and The upsetting rate can also be made smaller than in the method disclosed in Japanese Patent Publication No. 6043818, the stress acting on the punch is relatively small, and the width of the overhanging portion 29 is made parallel as shown in FIG. This makes it possible to further reduce stress, which makes it possible to extend the mold life compared to the method disclosed in Japanese Patent Publication No. 60-43818.Also, even with the same mold life, the punch and die are smaller. Since it can be used with other products, it is cheaper and it is possible to reduce the overall cost.

In addition, in this molding process,
As disclosed in the above publication, the width of the tip of the overhanging portion 29 may be narrowed and the width in the height direction may be increased so as to have the same cross-sectional area. In this case, it is possible to further improve the yield. becomes.

Furthermore, if the tip width of the claw portion 17 of the claw member 11 is sufficiently wide, it is possible to omit the extrusion molding process, and by controlling the volume of the material more strictly. , it is also possible to omit the triangulation process.

In addition, in the method for manufacturing a claw member configured as described above, the overhanging portion 29 that is upturned in the upsetting process is
Since the tip of the claw portion 17 is formed by extrusion molding to generate a burr 33, and then the burr 33 is trimmed, it is possible to easily form the tip of the claw portion 17 into an extremely thin shape.

Furthermore, in the method for manufacturing a claw member configured as described above, the extrusion molding is performed while bending the overhanging portion 29 at an angle of 5 degrees or more and less than 60 degrees, so that the material can be stabilized in the die. It also makes it possible to reduce the load of extrusion molding.

That is, extrusion molding may be performed using a flat die 41 as shown in FIG. It is difficult to insert it into the die 41 because it is widened, but as shown in FIG. It becomes possible to stably position the material with the die 45.

Note that if the bending angle θ of the projecting portion 29 is less than 5 degrees, it becomes difficult to perform sufficient positioning, and the load becomes high, reducing the effect.

Further, when the angle is 60 degrees or more, a problem arises in that it is necessary to use a cam mold or the like during trimming.

In this way, by performing extrusion molding while bending, the projected area is reduced, so it is possible to significantly reduce the molding load.

In addition, the die 45, which has an irregularly shaped groove, can be reinforced by the molding pressure of the material itself, eliminating the need for shrink fitting, etc., and being smaller, making it cheaper and extending the life of the die. becomes.

Furthermore, by bending in this manner, positioning during the bending process shown in FIG. 8 becomes extremely easy.

In addition, in the bending process, extrusion forming is performed at the same time.
By performing trimming after this, it is possible to omit the roofing process, but in this case, it is necessary to perform trimming using a cam mold with a complicated structure, which increases mold costs. This also causes problems in maintenance and the like.

In addition, during the bending process, tensile stress acts on the tip of the claw portion 17, and by narrowing the claw portion 17, it becomes easier for the crank to enter the tip. It becomes possible to reduce the amount.

Note that the piercing process after sizing may be performed at the same time as trimming or after the bending process.

[Effects of the Invention] As described above, in the method for manufacturing a claw member according to claim 1, the manufacturing process includes forming a slug having an outer diameter equal to or slightly smaller than the outer diameter of the boss portion, and A molding process in which volume is divided into a part that will become the boss part, a part that will become the main body of the member, and an overhanging part that will become the claw part, using a boundary surface that is considerably smaller than the outside diameter and slightly larger than the slug outside diameter, and this molding process. The upsetting process involves upsetting only the part that will become the main body of the part and the overhanging part to a thickness that is almost the same as the final thickness of the main body of the part, and the upsetting process involves bending the overhanging part that has been upholstered in this upsetting process. Since the structure has a bending process that forms the claw part, in the upsetting process where the forming load is the largest, the forming process creates volume in the part that will become the boss part 9, the part that will become the member body, and the overhanging part that will become the claw part. Since the divided parts are upset processed, the outside diameter during upsetting is only limited to the boss part or the lower part of the overhanging part by lightly restraining it in a tapered shape, and the material extends radially from the center. The molding load can be significantly reduced compared to the conventional method, and high-precision molding can be performed at low cost with a long mold life.

Further, in the method for manufacturing a claw member according to claim 2, the tip of the overhanging portion that has been upturned in the upsetting step is formed by drilling to generate burrs, and then the burrs are trimmed. Therefore, it is possible to easily form the tip of the claw portion to be extremely thin.

Furthermore, in the method for manufacturing a claw member according to claim 3, the roofing is performed while bending the overhanging portion at an angle of 5 degrees or more and 60 degrees or less, so that the material can be stably positioned with the die, Further, there is an advantage that the load for forming the roofing can be reduced and the life of the mold can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a claw member manufactured by an embodiment of the method for manufacturing a claw member of the present invention. FIG. 2 is a top view of FIG. 1. FIG. 3 is an explanatory diagram showing the slag. FIG. 4 is an explanatory diagram showing the material after the molding process. FIG. 5 is an explanatory diagram showing the material after the upsetting process. FIG. 6 is an explanatory diagram showing the material after the extrusion molding process. FIG. 7 is an explanatory diagram showing the material after trimming. FIG. 8 is an explanatory diagram showing the material after the bending process. FIG. 9 is an explanatory diagram showing the material after sizing. FIG. 10 is an explanatory diagram showing the product after piercing. FIG. 11 and FIG. 12 are explanatory diagrams showing a mold for forming thatch. FIG. 13 is an explanatory diagram showing a conventional method of manufacturing a claw member. [Explanation of symbols of main parts] 11...Claw member 13...Member main body 15...Boss portion 17...Claw portion 19...Protrusion portion 27°29 - Overhanging portion.

Claims (3)

[Claims] (1) A claw member for manufacturing a claw member in which a boss portion with a smaller diameter than the member body is formed on one side of the member body, and a plurality of claw portions are formed on the outer periphery of the member body. In the manufacturing method, a slug having an outer diameter equal to or slightly smaller than the outer diameter of the boss portion is formed, and a diameter portion that is considerably smaller than the outer diameter of the member body and slightly larger than the slug outer diameter is used as a boundary surface. A molding step in which volume is divided into a portion that will become the boss portion, a portion that will become the member main body, and an overhanging portion that will become the claw portion, and only the portion that will become the member main body and the overhanging portion formed in this molding step are formed into the member main body. A claw-shaped device comprising: an upsetting process in which upsetting is performed to a thickness that is approximately equal to the final thickness of the nail, and a bending process in which the overhanging part upturned in the upsetting process is bent to form a claw part. Method of manufacturing parts. (2) The claw member according to claim 1, characterized in that the tip of the overhanging portion that has been upturned in the upsetting process is exposed and formed to generate burrs, and then the burrs are trimmed. Production method. (3) Claim 2, characterized in that the extrusion molding is performed while bending the overhanging portion at an angle of 5 degrees or more and 60 degrees or less.
The method for manufacturing the clawed member described above.