JPH1076322A - Die for pressing work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally form even any thick articles such as an upper cover for a nuclear reactor vessel without using a large-scaled pressurizing machine. SOLUTION: By using a receiving base 7 which is a female die for supporting a material 10 and a male die consisting of a basic die 1 which is attached to the slide of a press a, 1st plunger punch 2 which is a cylindrical shape, a guide rod 3 for supporting the 1st plunger punch 2 movably to the basic die 1 so that the basic die 1 and the 1st plunger punch 2 are approachable and separable, pressure die 5 which is slidably fit to the outer peripheral surface of the 1st plunger punch 2 and with which the material 10 is pressed down to the receiving base 7, a 2nd plunger punch 4 which is slidably fit into the interior of the 1st plunger punch 2 and housed in the interior of the 1st plunger punch 2 and interposed body 6 which is attachably and detachably inserted in the interior of the 1st plunger punch 2 and with which the 2nd plunger punch 4 is projected from the 1st plunger punch 2 with contact of the basic die 1 with the 1st plunger punch 2, by making the pressurizing force of the press to the material 10 so as to selectively concentrate at a fixed place by attaching and detaching the interposed body 6, the pressurizing force of the press is sufficiently utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for press working, and is particularly effective when used for pressing a thick material.

[0002]

2. Description of the Related Art For example, when manufacturing a lid having a flange on the periphery of a hemisphere, as shown in FIG. 5 (a), a hemisphere 21 and a flange 22 are individually manufactured, and these hemispheres are formed. The lid 23 is obtained by forming a groove on the flange 21 and the flange 22 and then welding and joining the hemisphere 21 and the flange 22. For example, it is very troublesome to manufacture a thick-walled material such as the top lid of a nuclear reactor vessel by such a method. Therefore, when manufacturing a thick-walled lid, FIG. As shown in (), the lid 33 is obtained by forging a thick material so as to integrally form the hemisphere 31 and the flange 32, and then performing cutting to a predetermined size. .

[0003]

However, when a thick-walled material such as the top lid of a nuclear reactor vessel is manufactured by forging as described above, a large pressing force is required for the processing, so that a large scale is required. Therefore, the equipment that can be implemented is limited. For this reason,
It has been strongly desired that the above processing can be performed without a large-scale press machine.

[0004]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, is a press working die comprising a female die for supporting a material and a male die attached to a slide of a press machine. The male die is a base die attached to the slide, a first pressing die having a cylindrical shape, and the base is formed so that a distal end surface of the base die and a base end surface of the first pressing die can approach and separate from each other. A guide rod that movably supports the first pressing die with respect to the die, and slidably fits on the outer surface of the first pressing die along the axial direction to hold the material on the female die. A pressing die to be attached, a second pressing die that fits inside the first pressing die so as to be slidable along the axial direction, and can be stored inside the first pressing die, and the first pressing die. Is detachably inserted into the inside of the base, and the distal end surface of the base die and the base of the first push die are connected. Characterized in that with the abutment between the surface from the distal end of the first push-type comprising comprises an intervening body and projecting the tip of the second push-type.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a press die according to the present invention will be described with reference to FIGS. FIG.
2 is an overall schematic structural view, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an exploded perspective view of a main member.

In FIGS. 1 to 3, 1 is a basic type, 2 is a first pressing type, 3 is a guide rod, 4 is a second pressing type, 5 is a pressing type, 6 is an intermediary body, and 7 is a female type. It is a stand.

The base die 1 has a base end face attached to a slide of a press machine. First press mold 2
Has a cylindrical shape, and is formed such that the outer periphery on the tip side is narrowed at a predetermined curvature. The guide rod 3 is a basic mold 1
And the first pressing die 2 and connect the first pressing die 2 to the base die 1 so that the distal end surface of the base die 1 and the base end surface of the first pressing die 2 can approach and separate. It is slidably supported in the axial direction.

The second pressing die 4 has a columnar shape whose length is equal to the length of the inner peripheral surface of the first pressing die 2 in the axial direction, and is provided inside the first pressing die 2. A protrusion formed on the outer peripheral surface while being fitted so as to be slidable in the axial direction and having a distal end narrowed at a predetermined curvature continuous with the outer periphery of the distal end of the first pressing die 2. 4a engages with the engaging groove 2a on the inner peripheral surface of the first pressing die 2, so that it does not fall off from the first pressing die 2.

The pressing die 5 has a length shorter than that of the first pressing die 2 and has a cylindrical shape having an outer diameter of a predetermined size. The pressing die 5 is slidable on the outer periphery of the first pressing die 2 in the axial direction. At the same time, the tip is formed so as to be narrowed at a predetermined curvature that is continuous with the outer periphery of the tip of the first stamping die 2, while the projection 5 a formed on the inner peripheral surface is formed with the first stamping die 2. By engaging with the engagement groove 2b on the outer peripheral surface of the first pressing die 2, it does not fall off.

The interposition body 6 has a predetermined thickness, and has a disk shape having the same size as the inner diameter of the first pressing die 2, that is, the outer diameter of the second pressing die 4. 2 can be detachably inserted into the inside of the second press die 2, that is, the base end of the second pressing die 4 can be extended. That is, when the interposition body 6 is inserted into the inside of the first pressing die 2, and the distal end surface of the base die 1 and the base end surface of the first pressing die 2 are brought into contact with each other, the second pressing die While the distal end of the double press die 4 can be protruded by a predetermined length, by removing the intervening body 6 from the inside of the first press die 2, the distal end surface of the base die 1 and the base end surface of the first press die 2 are separated. Even if they are brought into contact with each other, the second pressing die 4 can be stored inside the first pressing die 2 without projecting the front end of the second pressing die 4 from the front end of the first pressing die 2. .

In the present embodiment, a male die is constituted by the basic die 1, the first pressing die 2, the guide rod 3, the second pressing die 4, the pressing die 5, the intervening body 6, and the like.

The cradle 7, which is a female mold, has a cylindrical shape having an inner diameter of a predetermined size, and is capable of supporting the material 10 at its upper end.

A case where, for example, an upper lid of a nuclear reactor vessel is manufactured by using such a pressing die will be described below with reference to FIG. FIG. 4 is an explanatory diagram of the procedure.

First, as shown in FIG.
While setting the material 10 thereon, the base die 1 is attached to a slide of a press (not shown), and then the slide of the press is operated to press the material 10 as shown in FIG. 4B. At this time, the intervening body 6 is removed.

When the material 10 is pressed in this way,
Since the pressing die 5 presses the peripheral edge of the material 10 against the receiving base 7, the material 10 is held without being shifted with respect to the receiving base 7, and the front end side of the first pressing die 2 moves around the central portion of the material 10. Since the pressing is performed, the corresponding portion of the material 10 is pressed (see FIG. 4C). At this time, since the second pressing die 4 is housed inside the first pressing die 2 without protruding from the tip of the first pressing die 2, the second pressing die 4 does not participate in the pressing of the material 10. For this reason, the pressing force of the press machine is concentrated on the first pressing die 2 without being applied to the second pressing die 4.

When the periphery of the central portion of the material 10 is pressed by the first pressing die 2 in this manner, the press by the pressing machine is released once, the base die 1 is pulled up, and the intermediate body 6
After the base end of the second pressing die 4 is extended by inserting into the inside of the first pressing die 2, when the press by the press machine is started again,
With the contact between the distal end surface of the base die 1 and the base end surface of the first die 2, the base die 1 is moved through the intervening body 6 into the second die 4.
, And the tip of the second pressing die 4 is made to protrude from the tip of the first pressing die 2, so that by pressing, the tip of the second pressing die 4 presses the central portion of the material 10,
The portion of the material 10 is pressed to form a lid having a flange on the periphery of the hemisphere (see FIG. 4D).

That is, the pressing force of the press is concentrated on the first pressing die 2 to press the periphery of the central portion of the material 10, and then the pressing force of the pressing machine is applied to the second pressing die 4 so that the material 10 is pressed. Press the central part of
The material 10 is pressed as a whole by combining the pressing of the press machine with the pressing force concentrated on a specific portion of the material 10. For this reason, since the pressing force of the press machine can be used to the maximum, even the thick material 10 can be sufficiently pressed.

Therefore, if such a pressing die is used, even a thick-walled one such as the top lid of a nuclear reactor vessel can be manufactured without using a large-scale press machine.

Further, since a thick material can be formed by press working without forging, the amount of cutting at the time of finishing can be significantly reduced, and the material cost can be reduced.

[0020]

According to the press working die of the present invention, even a thick material can be pressed, so that even a thick material such as the top lid of a nuclear reactor vessel requires a large amount of work. It can be manufactured without using a pressure machine.

[Brief description of the drawings]

FIG. 1 is an overall schematic structural view of an embodiment of a press die according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an exploded perspective view of a main member.

FIG. 4 is an explanatory view of a procedure of press working using the press working die of FIG. 1;

FIG. 5 is an explanatory view of a conventional manufacturing procedure of a lid having a flange on the periphery of a hemisphere.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 basic die 2 first pressing die 2a, 2b engaging groove 3 guide rod 4 second pressing die 4a projection 5 holding die 5a projection 6 intervening body 7 receiving base 10 material

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G21C 13/00 G21C 13/00 C

Claims (1)

[Claims] 1. A female die for supporting a material, and a male die attached to a slide of a press machine, the male die being a base die attached to the slide, a first pressing die having a cylindrical shape, A guide rod that movably supports the first pressing die with respect to the base die so that the distal end surface of the base die and the base end surface of the first pressing die can approach and separate from each other; and an outer surface of the first pressing die. A holding mold that slidably moves along the axial direction and presses the material on the female mold; and a fitting that slidably moves along the axial direction inside the first pressing mold. Then, a second pressing die that can be stored inside the first pressing die, and removably inserted into the inside of the first pressing die, and a distal end surface of the base die and a base end surface of the first pressing die. Interposed between the tip of the first pressing die and the tip of the second pressing die with the contact of And a press die.