JPS6015038A - Die forging method - Google Patents

Abstract

PURPOSE:To form a longitudinal hole in a solid T-shaped crude material by a forging machine having only a longitudinal cylinder by mounting a solid T- shaped crude material in two-segmental dies in inverted T-shape, inserting said dies in an external die and pressing in a punch. CONSTITUTION:A heated solid T-shaped material 100 is inserted in two-segmantal dies 2 in inverted T-shape and this two-segmental dies 2 are inserted into an external die 1 and held. Then, a guide jig 4 havng a through hole 4a corresponding to maximum diameter of a punch 3 and outer diameter of which fits to forming face of two longitudinal grooves of sectional dies 2 is placed on upper end face of the solid T-shaped material 100. The external die 1 is fixed on the table of a forging machine and the tip of the punch 3 is inserted into the through hole 4a of the guide jig 4, and pressed in the solid T-shaped material 100 guiding the punch 3 to the through hole 4a. By this way, a longitudinal hole 100a is formed, and at the same time, excess metal pushes up the guide jig 4 and goes up in the two-sectional dies, and the products such as a T-shaped tube joint etc. are forged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die forging method, and more particularly to a die forging method for punching a hole in a solid T-shaped rough material using an outer die, a two-part die, and a punch.

Large forged T-shaped pipe joints are required as important pipe joints for nuclear power generation and other applications. As a step before forming a T-shaped pipe joint, as shown in Fig. 1, a solid T-shaped rough material ioo
A vertical hole 10 (l a ) is punched, and then a horizontal hole shown in phantom is formed to obtain a T-shaped pipe joint.

The present invention relates to a die forging method for punching a vertical hole 100a in a solid T-shaped rough material 100.

A forging method for punching a vertical hole 100a in a conventional solid T-shaped rough material 100 will be described.

Using a forging machine equipped with a main cylinder in the vertical direction and both side cylinders in the horizontal direction, a solid T-shaped rough material 100 was placed in both molds divided into two by a plane containing the vertical axis center and the horizontal axis center. The heated rough material ioo was accommodated, and the positions of both molds were held under strong pressure with both horizontal side cylinders to fix the position, and punching was performed with the vertical main cylinder. Therefore, it is difficult to form the vertical hole 100a in one step due to the lack of capacity of the forging machine, especially when it comes to large-sized rough materials.

The present invention uses an outer mold, a two-part mold, and a punch.
The present invention provides a die forging method that allows a vertical hole to be formed in a solid T-shaped material even by a forging machine having only two vertical cylinders.

A die forging method according to the present invention will be explained with reference to the drawings.

Figures 2 (a), (b), (c), and (b) show the outer mold 1. In the embodiment, the outer mold 1 has a rectangular shape, and has an upper opening 1.
Step portions 1b are provided on the four circumferences of the upper and lower portions, and a lower opening 1c is provided, which is smaller than the upper opening 1a. 3 and 4 show the two-part mold 2. The two-part mold 2 is as shown in FIG.
The solid T-shaped material ioo is divided into two parts on a plane including the vertical and horizontal axes, and each has a semicircular la shape with a vertical groove 2a opening at the top and intersecting this to form an inverted T shape, with both ends closed. There are horizontal grooves z&' in the shape of a semicircular tumulus, and both vertical grooves 2a and both horizontal grooves 2
a' together form a space in which the solid T-shaped material 100 is accommodated in an inverted T-shape. Also, the length of both vertical grooves 2a is a solid T.
It is formed to have a size with enough room to accommodate the profile material 100.

2b is a stepped portion provided at the lower periphery of the two-part mold 2;
It is engaged with the stepped portion 1b of the outer mold and serves as a holding portion for the two-part mold 2 formed by the outer mold 1. The two-part mold 2 is formed into an external shape that can be fitted into the outer mold 1 as a unit. Therefore,
The two-part mold 2 and the outer mold 1 can be molded together. FIG. 5 shows the punch 3, whose cross-sectional shape is formed according to the required shape of the product, such as circular, oval, or rectangular.
A pair of triangular notches 3a' into which wedges (not shown) are driven are provided in parallel on both lower surfaces of the collar 3a of the punch. This is to allow the punch 3 to be easily removed by driving wedges into both notches 3a', and to reduce the draft angle of the punch 3.

Next, a die forging method using the outer die 1, the two-part die 2, and the punch 3 will be explained.

The heated solid T-shaped phase material 100 is sandwiched between the two-part mold 2 into an inverted T shape, and then the two-part mold 2 is fitted into the outer mold 1, and the two-part mold 2 is held together. . Next, place a guide jig 4 in the center T, which has a through hole 4 corresponding to the maximum diameter of the punch 3 and whose outer diameter fits into the circular mound surface formed by the two vertical grooves 2 of the two-part mold 2 coming together. It is placed on the upper end surface of the profile material 100.

Then, the outer mold 1 is placed and fixed on the table of a forging machine (not shown). Next, insert the tip of the punch 3 into the through hole 4 of the guide jig.
a and press fit into the solid T-shaped material 100 while operating the ram of the forging machine and guiding the punch 3 to the through hole 4a of the guide jig.

In this way, the vertical hole LOOa is formed, and the excess material pushes up the guide jig 4 and rises inside the mold 2 of the double damage 11 to become a product.

After forging is completed, drive wedges (not shown) into both notches 3g' of the punch, remove the punch 3, and replace the two-part mold 2 with the outer mold 1.
Then, the bifurcated mold 2 is divided and a product in which a vertical hole 100a is formed in a solid T-shaped material 100 is taken out.

The present invention is a semicircular mound with a solid T-shape in the form of a two-part gold tuft consisting of a vertical groove opening at the upper end and a semicircular horizontal groove intersecting this to form an inverted T-shape and closing both ends. The material was sandwiched in an inverted T shape, and then a bipartite zero-damage mold was fitted into the outer mold, the outer mold was fixed on the table of a forging machine, and the material was placed on the upper end surface of the solid T-shaped material. The ram of the forging machine is actuated to force the guide jig to guide the punch, and the punch is press-fitted into the solid T-shaped material to form a vertical hole.

Therefore, the main cylinder in the vertical direction as in the vertical direction.

silling only in the longitudinal direction, but not limited to forging machines with both horizontal and side cylinders.

By using a forging machine with a

[Brief explanation of the drawing]

Figure 1 is an enlarged perspective view showing a solid T-shaped material, Figure 2 (A)
is a front view of the outer mold according to the present invention, No. 2 No. 1 (B) is a side view of the same, and No. 2 G/-1 is a sectional view taken along line A-A in FIG. 2 (A). ) is a sectional view taken along the line B-B of FIG. 2(B), FIG. 3 is a side view showing the two-part mold according to the present invention, FIG. 4 is a front view showing the inner surface of the same, and FIG. FIG. 6 is a cross-sectional view for explaining the die forging method according to the present invention. 1: outer mold, la: upper opening, 1b: step, lc: lower opening, 2: two-part mold, 2a: (semi-circular mound-shaped) vertical groove,
2 a': horizontal groove (of semicircular tumulus), 2b: step, 3:
Punch, 3 a': (triangular) notch, 4: Guide jig. Representative Patent Attorney Former 1) Toshiyuki

Claims (1)

[Claims] 1. A solid T-shaped coarse groove is formed using a two-part mold with a vertical groove in the shape of a semicircle and an opening at the upper end, and a semicircular continuous horizontal groove that intersects this to form an inverted T-shape and closes both ends. The material is sandwiched, and then the two-split mold is fitted into the outer mold, the outer mold is fixed on the table of the forging machine, and the guide jig is placed on the upper end surface of the solid T-shaped rough material. A die forging method characterized by operating a ram of a forging machine while guiding a punch and press-fitting the punch into a solid T-shaped rough material to form a vertical hole.