JPS62282740A - Die forging method for article having drum part flange and drum part both end flange - Google Patents

Abstract

PURPOSE:To forge the titled article to a good shape by a small capacity forging machine by fitting a die holder to a tapered outside peripheral surface of a split die, forming a both end flange part by forging an inserted stepped heating blank, and forming a drum part flange by pressing in a punch. CONSTITUTION:A split die 1 is tightened up by fitting an inclined inside peripheral surface 1A of a die holder 2 to an inclined outside peripheral surface 1A whose diameter is enlarged in the press direction of the split die 1. A stepped heating blank 3 is inserted into a hole in the split die 1 so that a stepped part 3A conforms with the upper flange formed part 2B, and forged, by which the upper and lower flange parts 6A, 6B are formed. Subsequently, by pressing a punch 5 into the center of an upset anvil 4, a drum flange part 6C is formed. By tightening the split die 1 by the tapered die holer 2, its tightening mechanism is simplified and the tightening is executed exactly, and by a two step forging system, the titled good shape and precise article is forged by a small capacity press.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a die forging method by closed forging of an article having a body flange and body flanges at both ends. Used in the process of manufacturing oil drilling valves, etc.

(Prior Art) As shown in FIG. 2, there is an article 6 having a body flange 6C and flanges 6A and 6B at both ends of the body, such as a valve for oil drilling. It was forged using the method shown below.

In FIG. 3, numeral 1 is a split die, which has upper and lower flange forming portions 1B, 1C and a body flange forming portion 1D on its inner peripheral surface. 3 is inserted and set on the fixed base 7 in a vertically protruding shape.

During die forging, as shown in FIG. 3, a press force is applied to the material 3 by an upset anvil 4, and a lateral push cylinder 8 is used to prevent the split die 1 from expanding.

(Problems to be Solved by the Invention) In the above-mentioned prior art, since the body flange 6C and the body both end flanges 6A and 6B are molded at the same time, precise molding can be achieved by changing the material flow. It is difficult to do so, and moreover, a large amount of pressing force is required, which inevitably increases the capacity of the horizontal pushing cylinder 8.

In the present invention, the flanges at both ends of the body, that is, the main flange and the body flange, are individually forged, so that they can be formed even with a relatively small-capacity press, and furthermore, the expansion of the split die can be prevented by mechanical means using a gouger holder. The purpose is to make it possible to achieve this.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned objects are characterized by having an inclined outer circumferential surface IA whose diameter is enlarged in the pressing direction, and an inner circumferential surface. .

The body has a flange 6C and flanges 6A and 6B at both ends of the body.
A split die 1 that is expandable and contractible in the radial direction and has respective flange forming portions 1B, 1C, and 10, and an inclined inner circumferential surface 2A that matches the inclined outer circumferential surface IA of the split die 1. This is a method in which a material 3 is hermetically forged on a fixed base 7 using a gooey holder 2 that is removably fitted and an upset anvil 4, and the material 3 is formed into a step in the upper flange forming portion 1B of the split die 1. The part 1B' has a stepped part 3A that engages with the material in the axial direction, and the material 3 is in a state where the stepped parts 1B' and 3A are engaged with each other.
are inserted and set into the respective flange forming portions 1B, 1C, and 10 of the splitting die 1 in a vertically protruding shape, and then a pressing force F is applied from the upper end surface side of the material 3 by the upsetting anvil 4, and the fixing base 7 and the splitting die 1 are The upper and lower flanges 6A and 6B are molded with the lower flange molding part 1C and anvil 4 and the upper flange molding part 1B of the split die 1 sealed, respectively, and then, in the sealed state, the upper and lower flanges 6A and 6B are molded on the axis of the upsetting anvil 4. The punch 5 provided for this is press-fitted F' from the upper end surface side of the material 3, and the body flange 6C is formed by the body flange forming portion 1D of the split die 1.

(Example) FIGS. 1 to 7 show the molding order according to the embodiment of the present invention according to the steps.

In this Figure 1, 1 is a split die, for example, 2
A tapered inclined outer peripheral surface 2A that has a split structure and can be expanded and contracted in the radial direction, and the diameter is expanded in the pressing direction.
The inner peripheral surface has both end flange molded parts 1B, 1C and a body flange molded part 1D.

2 is a gooey holder, and the inclined outer circumferential surface L of the split die 1 is
It is a circumferentially integral body having an inclined inner circumferential surface 2A that matches A, and is fitted onto the splitting die 1 so as to be freely insertable and removable.

Reference numeral 3 denotes a material, which has a stepped portion 3A, which is adapted to engage with the stepped portion 1B' of the upper flange molded portion 1B in the axial direction of the material, and as shown in FIG. Set on 7.

That is, each flange forming part 1B, 1C, 10 of the split die 1 is inserted with the stepped parts 1B', 3A engaged with each other.
The material 3 is inserted and set in a vertically protruding shape.

Next, forging is performed by applying a press F from the upper end surface side of the material 3 using the upset anvil 4, as shown in FIG.
As shown, a press force F is applied to the lower flange molded part 1C, the end face of the seventh fixed anvil 4, and the upper flange molded part 1B in a sealed state.

As a result, the upper and lower flange portions 6A and 6B are formed or preformed, and in particular, in the upper flange formed portion 1B, the stepped portion 3A of the material 3 ensures the radially outward flow of the material.

Next, as shown in FIG. 1, a press F' is applied to the punch 5 provided on the axis of the abseno anvil 4, and the body flange forming section 10 forms the body flange 6C.

That is, by press-fitting the punch 5 in the sealed state, the material flows radially outward, and the body flange portion 6C
At the same time, the upper and lower flange parts 6A and 6B are forged more precisely.

After forging, the product 6 is taken out after going through various steps such as removing the frame of the gooey holder 2 as shown in FIG. 15 and expanding the splitting die 1 as shown in FIG. The mold will be made as shown.

(Effect of the invention) According to the present invention, the body flange 6C1 both end flanges 6A
, 6B are individually molded, the press capacity of the anvil 4 may be small.

At this time, by forging both end flanges 6A and 6B in advance, precise closed forging can be achieved, and then the body flange 6C is formed, so that the article 6 has improved precision.

Furthermore, during forging, the expansion of the split die 1 is prevented by the guide holder 2 that is fitted into it, which is not only advantageous in maintaining the sealed state reliably, but also advantageous in terms of cost. .

[Brief explanation of drawings]

1 to 17 are sectional views of main parts shown in the order of steps of the embodiments of the present invention, FIG. 2 is a perspective view of an example of an article targeted by the present invention, and FIGS. 3 1 and 2 are It is each sectional view of a conventional example.

Claims (1)

[Claims] (1) Inclined outer peripheral surface 1 whose diameter is enlarged toward the press direction
A, and each flange molded part 1B, 1 of a body flange 6C and body both end flanges 6A, 6B is formed on the inner peripheral surface.
A split die 1 having diameters C and 1D that can be expanded and contracted in the radial direction, and an inclined inner circumferential surface 2A that matches the inclined outer circumferential surface 1A of the split die 1.
A die holder 2 which is removably inserted into the split die 1 and an upset anvil 4 are used to fix the fixing base 7.
In this method, the material 3 is hermetically forged for the material 3, and the material 3 has a step 3A that engages with the step 1B' in the upper flange forming portion 1B of the split die 1 in the axial direction of the material, and the step 1B' , 3A are engaged with each other and the material 3
is inserted into each flange forming part 1B, 1C, and 1D of the splitting die 1 in a vertically protruding shape, and then a pressing force F is applied from the upper end surface side of the material 3 by the upsetting anvil 4, and the fixing base 7 and the splitting die 1 are The upper and lower flanges 6A and 6B are molded with the lower flange molding part 1C and anvil 4 and the upper flange molding part 1B of the split die 1 sealed, respectively.Next, the axis of the upset anvil 4 is molded in the sealed state. A body flange and body both end flanges characterized in that a punch 5 provided above is press-fitted F' from the upper end surface side of the material 3 and a body flange 6C is formed in the body flange forming part 1D of the split die 1. A die forging method for an article comprising: