JPH02147142A - Forging dies - Google Patents

Abstract

PURPOSE:To easily remove insert dies by forming engraved surfaces on the contact surface parts of a pair of insert dies and interposing an intermediate member inserted from the outer peripheral side to the inner peripheral side between the insert dies. CONSTITUTION:A disk having wings is forged by an upper and a lower die 11, 10. An engraved surface is formed on the abutting part so that a cavity 17 is constituted on the upper and lower dies 11, 10 when they are closed. Plural insert dies 15, 16 are provided continuously in an annular shape around the engraved surfaces of the lower die 10 and engraved surfaces are formed on the contact surface parts between the contact members. Then, the engraved surfaces are formed on the contact surface parts between a pair of adjacent two insert dies 15, 16. The intermediate members (wedge members) 18 inserted from the outer peripheral side to the inner peripheral side are interposed between a pair of insert dies. By this method, the insert dies are removed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a forging die for forging a bladed disk such as a turbine wheel.

[Prior Art] Generally, a bladed disk such as a turbine wheel is
The product is made into a product by forging and then machining. Here, forging is a process in which a conical billet is forged in stages to form a gradually flattened disc shape, and a blade is formed in the final stage of forging, and the forging mold in this final stage is Conventionally, those shown in FIGS. 7 and 8 have been used.

FIG. 7 shows the lower mold, which is detachably fixed to the lower mold plate l by fastening means (not shown) at the center. Here, as shown in FIG. 8, the nesting die 3 has a shape in which a ring is equally divided in the circumferential direction on its radius line, and the side surface that contacts the neighboring nesting die 3 has a
A carved surface 3a is formed to constitute a cavity 5.

Such a lower die is used as a pair with an upper die (not shown), and the final forging is performed after the billet shown in Fig. 9 is roughly forged in another forging die. The wheel portion of the turbine wheel is molded in the cavity formed by the mold, and the blade is molded in the cavity 5 of the nesting mold 3.

[Problems to be Solved by the Invention] However, in the forging die as described above, there is a problem in that only a blade having a simple shape can be formed. That is, when taking out the turbine wheel molded in the forging die, the mold assembly 2 is removed from the lower die plate 1 along with the molded turbine wheel, and the support ring 4 and the mold 3 are removed.
... is removed from the turbine wheel, but since the nesting mold is shaped like a ring divided into equal parts, the nesting mold 3 must be pulled out in the radial direction of the turbine wheel.

For this reason, the shape of the engraving surface 3a is limited to those that allow the nesting mold 3 to be removed from the blade, and the cross-sectional area of the blade increases toward the outer periphery, or it does not extend straight in the radial direction. This makes it impossible to remove the nesting die 3 after forging.

Furthermore, in the forging die described above, since the nesting die 3 has a complex three-dimensional shape in which the ring is divided into equal parts, there is also a problem in that it requires a great deal of time and cost to manufacture.

[Object of the invention] This invention was made in view of the above circumstances, and it is possible to reduce the manufacturing cost of the nested mold, as well as to reduce the manufacturing cost of the nested mold.
An object of the present invention is to provide a forging die capable of forging a turbine wheel having a complicated shape.

[Means for Solving the Problems] The forging die of the present invention includes two adjacent nesting dies as a pair, forming a carved surface on their contact surfaces, and forming an outer periphery between the pair of nesting dies. The main feature is that an intermediate member is inserted from the side toward the inner circumference.

[Operation] The forging die having the above configuration includes a plurality of pairs of nested dies,
Since the intermediate member interposed between them constitutes a ring-shaped nested mold assembly as a whole, the individual nested molds do not have to be in the shape of equally divided rings. In other words, since the nested mold can be formed into a rectangular parallelepiped shape that is easy to manufacture, the manufacturing cost of the nested mold can be significantly reduced. Furthermore, by removing the intermediate member after forging, it is possible to move the nesting mold in a direction that deviates from its radial direction. The nesting molds can be pulled out by releasing the engagement, and a desired turbine wheel can be formed by forming a complex engraved surface on the contact surface between the nesting molds.

[Example] Figures 1 to 6 show an example of the present invention, and Figure 4 is a side sectional view showing the entire forging die of the example, showing a lower die 10 and an upper die brake. ) 11. The reference numeral 12 in the figure is a lower mold plate, and the lower mold plate 1
An engraved surface 12a is formed in the center of 2. An annular groove 13 is formed on the outer periphery of the engraved surface 12a, and a nested assembly 14 is fitted into the groove 13.

FIG. 1 is a partially exploded plan view showing the nested assembly 14. FIG. In the figure, numerals 15 and 16 indicate nested types. Nested type 1
5.16 are made to have a rectangular parallelepiped appearance by butting them together, and engraved surfaces 15a and 16a are formed on the contact surfaces, as shown in FIGS. 2 and 3. A cavity 17 communicates from one side of the nesting mold 15.16 to the other side by the engraving surfaces 15a and 16a.
is formed, and this cavity 17 has a constant cross-sectional shape and cross-sectional area. Also, nested type 15゜16
Recesses 15b and 16b are formed at two corners of the contact surface.

Two such nested molds 15 and 16 are arranged in a ring shape in the groove 13 of the lower mold 10. and,
A wedge member (intermediate member) is provided between the pair of 15 and 16.
1B is interposed.

The wedge member 18 has a tapered shape in which the front and back surfaces are inclined to each other, and is formed by inserting molds 15 and 16 arranged in the groove 13 in advance.
It is inserted between the pair from the outer circumferential side to the inner circumferential side.

As a result, the nested molds 15 and 16 cannot be separated from each other.

Incidentally, an engraved surface 11a and a groove 11b similar to those of the lower mold plate 12 are also formed in the center of the upper mold II.

Next, a procedure for forging a turbine wheel using the forging die configured as described above will be described.

First, a pre-roughly forged semi-finished product is placed in the center of the lower mold plate 12, and the upper mold 11 is lowered (FIG. 5). As a result, the semi-finished product is compressed vertically and its meat spreads horizontally. When the upper mold 11 further descends, the nested mold assembly 1
4 is fitted into the groove llb of the upper mold 11, and then the meat is pushed into the cavity 17 of the nesting mold 15, 16 to form the pole portion 20a and blade 20b of the turbine wheel 20. At this time, the nested assembly 14 is 1M1 of upper and lower type.
1b, backed up by 13 (Figure 6)
.

When the upper mold 11 is raised, the turbine wheel 20 is taken out from the lower mold plate 12 together with the nested mold assembly 14. Then, the wedge member 18 is moved in the outer circumferential direction to
Extract from 4. Next, nested type 15. +6 is pushed out on their outer peripheral sides and the engraving surfaces 15a, 16a are separated from the blade 20b. This task is performed using nested type 15.16
This is done by inserting a crowbar or the like into the recesses 15b, I6b.

When the engraving surfaces 15a and 16a are separated from the blade 20b,
The nesting molds 15.16 are moved in the direction of the outer circumference, and in this way, the nesting molds 15.16 are successively removed from the blade 20b.

In the forging die having the above configuration, the nesting die assembly 14 is constructed by interposing the wedge member 18 between the pair of nesting dies 15 and 16, so that the individual nesting dies 15,
16 can be made into a simple shape almost like a rectangular parallelepiped, so the manufacturing cost of the nested molds 15 and 16 can be significantly reduced.

Moreover, by pulling out the wedge member 18, the nesting mold 15.
16 can be easily released from the blade 20b,
The nesting molds 15, 16 can be removed very easily. Furthermore, by extracting the wedge member 18, the nesting molds 15, 16 can be extracted in a direction deviated from the radial direction. Even if the nested molds 15 and 16 do not extend straight in the radial direction, the nested molds 15 and 16 can be extracted, and the engraving surface +5a,
Desired turbine wheel 20 with complicated shape 16a
can be forged.

By the way, as a means for fixing the nested type assembly 14 in the groove 14, for example, a tapered ring or the like can be used to fix the nested type assembly 14 in the groove 14.
Well-known means such as tightening or fixing the outer periphery of the lower mold plate 12 can be used. It may be composed of In other words, in warm forging and hot forging, the mold is usually preheated before the start of the forging process in order to improve the rotation of the metal. The telescoping assembly 14' is fastened in the groove I3. In addition, with this configuration, the mold etc. are cooled and the i.
Since the tightening by M+3 is released naturally, the turbine wheel 20 can be easily taken out from the lower mold plate 12.

In the above embodiment, the wedge member 1 is used as the so-called intermediate member.
8 is used, but the shape can be arbitrary as long as it can tighten and fix the nesting molds 15 and 16. In addition, although the forging die described above is one in which pairs of nesting dies 15 and 16 are arranged at equal intervals in the circumferential direction, the same effect can be achieved even if the nesting dies are unequally spaced. Since the above-mentioned pair of nested molds are formed with an intermediate member inserted from the outer circumferential side to the inner circumferential side between them, each nested mold can be formed into a very simple cedar shape that is almost a rectangular parallelepiped. Therefore, the manufacturing cost of the nested mold can be significantly reduced. Further, by extracting the intermediate member, the nesting mold can be easily released from the blade of the turbine wheel, etc., and the nesting mold can be removed extremely easily. Furthermore, by removing the intermediate member, the nested mold can be pulled out in a direction that deviates from the radial line. Even when the nesting molds are not extended, the nesting molds can be extracted, and a desired turbine wheel can be molded by forming a complex carved surface on the contact surface between the nesting molds.

[Brief explanation of the drawing]

Figures 1 to 6 are side sectional views (not showing the whole) of an embodiment of the present invention, Figure 5 is a side sectional view of a forging die showing a state in which forging is being performed, and Figure 6 is a top view of the forging die. 7 and 8 are side sectional views of the forging die showing a state in which the die has reached the bottom dead center, FIG. 7 shows a conventional forging die, FIG. 7 is a plan view showing the lower die, and FIG. 8 9 is a perspective view showing a nested assembly, and FIG. 9 is a perspective view showing a billet. Fig. 5 0... Lower mold, 1... Upper mold, 3... Groove, 5.16... Nested mold, 5a, 16a... ... Carving surface, 7 ... Cavity, 8 ... Wedge member (intermediate member). 1b Figure 6

Claims (3)

[Claims] (1) A forging die for forging a winged disk consisting of a disc-shaped wheel part and a plurality of blades protruding from the outer periphery of the wheel part and extending in a substantially radial direction of the wheel part, which The upper and lower molds have engraved surfaces formed on their abutting parts to form a cavity when the mold is pressed, and the lower mold has engravings on the contact surfaces of the parts that are connected in a ring shape surrounding the engraved surfaces of the lower mold. It is equipped with a plurality of nesting molds each having a surface formed thereon, and the upper and lower mold cavities allow the wheel part,
In a forging die configured to form a blade using a cavity consisting of a nested engraved surface, two adjacent nested dies are formed as a pair and the engraved surface is formed on the contact surface between them, and the above-mentioned pair of nested dies are A forging die characterized in that an intermediate member inserted from the outer circumferential side to the inner circumferential side is interposed between the nesting dies. (2) A groove on a ring is provided around the engraving surface of the lower mold so as to surround the engraving surface, and the insert mold is inserted into this groove. Forging mold. (3) At least one of the insert mold and the intermediate member is made of a material having a coefficient of thermal expansion larger than that of the material of the portion constituting the groove of the lower mold. A forging die according to claim 2.