JPH01205844A - Method for cold forging flange companion - Google Patents

Abstract

PURPOSE:To take the balance of a volume at the boss and boss hole forming time and to improve the yield of a material by forming a recessed part at the flange back side in case of the flange cold heading time at the cold forging forming stage of a flange companion. CONSTITUTION:A flange 2 is subjected to cold heading by a rocking press by executing annealing and bonderizing after preforming a material 1 by cutting a material. At this time, a recessed part 4 is formed in advance at the back side of the flange 2 and the body 5 subjected to cold heading of the flange 2 is annealed to execute bonderizing thereon. The clamping by a press die 8 is then executed by putting the body 5 subjected to flange heading into the die 9 of a boss forming die, an upper side punch 6 is pushed in and a boss 3 and boss hole 12 are simultaneously formed by the die 9 and lower side punch 7. At this time, the balance of the volume of the part A to be pushed out and that of the part B of the boss 3 can be taken because the recessed part 4 is formed at the flange back side and the material yield is improved. Thereafter, the C part is subjected to piercing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for cold forging a flange companion with improved yield.

[Conventional technology] The conventional processing and forming method for flange companions is as follows:
For example, some machines perform total machining using the following process.

First, use a single-function machine to remove excess thickness, i.e., process the broach pilot hole.
The mounting surface is machined, and a single-function machine is also used to machine the counterbore and the back of the collar. Next, a broach is passed using a broaching machine, and a pilot side rough machining, an outer diameter rough machining, an outer diameter finishing process, and a pilot finish are sequentially performed using an NO lathe. Next, a hole is drilled using a drill unit, cleaning is performed using a cleaning device, air blowing is performed, and hardening is performed using a hardening machine. Next, the cleaning equipment is used to clean, the degreasing equipment is used to degrease, the painting equipment is used to paint, and the polishing equipment is used to polish the parts.Then, the dust cover is press-fitted using a press machine and caulked.

In addition, as a processing method different from the above-mentioned machining,
There is also a hot forging method in which a flange companion is formed by hot forging.

This processing and forming method is the main method for processing and forming the flange companion.

[Problems to be solved by the invention] However, in such conventional molding methods,
In both cases, a large amount of material chips was generated, so the material yield was approximately 70% (weight of finished product/weight of raw material). That is, there was a problem that the yield of the material was not good.

[Means for Solving the Problems] The present invention has been made in view of such conventional problems, and provides a cold forging forming method for a flange companion in which the yield is improved by cold forging. is intended to provide.

To achieve this objective, the present invention provides that after preforming the material, predetermined recesses are formed in the flange in order to balance the volume of the extruded part when heading the flange and the volume of the part where the boss is formed. A boss and a boss hole are formed at the same time using a die and a punch, and the piercing is punched out after the boss is formed.

[Function] In the present invention, when forming the flange, a predetermined recess is formed on the back side of the flange, so when forming the boss, the volume of the extruded part and the volume of the part where the boss is formed are balanced. can be taken.

As a result, the material yield can be improved in the cold forging forming process.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 to 7 are diagrams showing one embodiment of the present invention.

Hereinafter, a cold forging method for forming a flange companion will be described with reference to FIGS. 1 to 7.

First, as shown in FIG. 2, the material 1 is cut, and then, as shown in FIG. 3, the material 1 is preformed.

Next, after preforming, it is annealed, bonderite is applied, and the fourth
As shown in the figure, the flange 2 is forged using an oscillating press.

In this case, as shown in FIG. 1, a recess 4 is formed on the back side of the flange 2 in order to balance the volume of the extruded portion A and the volume of the portion B where the boss 3 is formed.

After the flange 2 is forged, the forged part 5 is annealed and bonderite applied.

Next, the boss 3 is molded using a boss mold as shown in FIG.

In Figure 1, 6 is an upper punch, 7 is a lower punch, and 8 is an upper punch.
1 is a presser die, 9 is a die, 10 is a spacer, and 11 is a knockout pin.

Put the flange head 5 into the die 9 and press the presser die 8.
By clamping with
2 is formed simultaneously.

In this case, since the recess 4 is formed when the flange 2 is forged, the volume of the extruded portion A and the volume of the portion B where the boss 3 is formed can be balanced. The state in which the boss 3 is molded is shown in FIG.

Next, as shown in FIG. 6, the portion indicated by C is punched out.

Next, the earrings are punched out, Bonderite is applied, and the final molding is performed. The finished state is shown in FIG.

As described above, by forming the predetermined recess 4 during flange heading, the volume of the extruded portion A and the boss 3 can be adjusted.
It is possible to balance the volume of part B where the material is molded, and the yield of material 1 is 90%.

[Effects of the Invention] As explained above, according to the present invention, in the cold forging forming process of the flange companion, a recess is formed on the back side of the flange during flange forging, so that the first multi-step process is simplified. Volume can be balanced and material yield can be improved.

[Brief explanation of the drawing]

Figure 1 shows the boss mold; Figure 2 is a cutting process diagram, Figure 3 is a preforming process diagram. Figure 4 is a flange forming process diagram. Figure 5 is a diagram of the boss forming process. Figure 6 is a diagram of the piercing punching process. FIG. 7 is a diagram of the final molding process. In the figure, 1... Material, 2...flange, 3...Boss, 4... recess, 5... Forged flange, 6... Upper punch, 7...lower punch, 8...presser die, 9...Die, 10...Spacer, 11...knockout pin, A...The part that is pushed out, B...The part where the boss is formed, C...Earring punching part. Patent applicant: Fuji Iron Works Co., Ltd.

Claims (1)

[Claims] After preforming the material, a predetermined recess is formed on the back side of the flange in order to balance the volume of the extruded part when pressing the flange and the volume of the part where the boss will be formed, and then the die and punch are pressed. 1. A method for cold forging a flange companion, characterized in that a boss and a boss hole are simultaneously formed using the same method, and piercing punching is performed after forming the boss.