KR20210001830U - Four die forging machine - Google Patents

Abstract

An object of the present invention is to provide a 4-die forging apparatus having a body made of a high-strength, high-toughness material. For the above purpose, according to an embodiment of the present invention, the upper body is movable with inclined surfaces formed toward both ends on the lower surface; a lower body having an inclined surface formed by improving both ends on the upper surface and being fixed; two side slides disposed between the upper body and the lower body, the upper portion having an inclined surface corresponding to the inclined surface of the upper body, and the lower portion having an inclined surface corresponding to the inclined surface of the lower body; a plurality of guideways dynamically connecting the upper body and the side slide, and the lower body and the side slide; an upper die fixed to a lower portion of the upper body; a lower die fixed to the upper portion of the lower body; two side dies fixed to one side of the side slide; and die fixing means for fixing the upper die, the lower die and the side die to the upper body, the lower body and the side slide, wherein the material of the upper body and the lower body is C: 0.30 to 0.50 wt%, Si: 0.10 to 0.45 wt%, Mn: 0.5 to 5.0 wt%, S: 0.05 wt% or less, P: 0.05 wt% or less, Cr: 0.5 to 7.0 wt%, Mo: 0.2 to 1.0 wt%, Cu: 0.3 wt% or less To provide a 4-die forging apparatus, which is an alloy steel containing a component of

Description

4-Die Forging Machine {FOUR DIE FORGING MACHINE}

The present invention relates to a typical metal processing field, and more particularly, a 4-die forging that can be used for forging of ingots and billets of various steels or alloys on a hydraulic forging press and a radial swaging device. It's about the device.

Structural steel, stainless steel, as well as manufacturing of elongated parts such as rods, columns, intermediate shafts, torsion bars, rolling mill rolls, etc. , in the machining and metallurgical industries for the manufacture of forged parts for the subsequent forming of forged parts of high temperature and difficult-to-work steels and alloys.

In Patent Document 1, a movable upper body having an inclined surface, a fixed lower body, and a side slide having an inclined surface corresponding to the inclined surface of the bodies are included, and the side slide is dynamically connected to the upper and lower bodies. A four-die forging device is known, which is movably mounted relative to the bodies, the side slides being connected to the bodies by guideways of P-shaped cross-section.

One side of each guideway is rigidly connected to the upper and lower bodies by suitable pins, and the other side of each guideway is inserted into a respective groove provided in the side slide, and sliding between the guideway and the side slide. There are gaps along the sides. An upper and a lower body is connected to each of the upper and lower dies, and the side die is connected to the side slide. The dies are connected to the respective bodies and slides with the aid of P-shaped clamps and tie pins coming out through the upper and lower body and side slides, the clamps being inserted into grooves provided in the body, the slide and the die. Each projection is provided.

The disadvantage of the patent document 1 technique is that the service period that does not require repair is not sufficient due to the guideway wear on the sliding surface and the tendency to score build (score build, dent in the body), and excessive time is required to replace the die. and the efficiency is low.

In addition, Patent Document 2 includes a movable upper body having an inclined surface, a fixed lower body, and side slides dynamically connected to the bodies, wherein the side slide has an inclined surface corresponding to the inclined surface formed on the upper and lower body, and , a four-die forging device that is displaceably installed with respect to an upper and lower body by a guideway of F-shaped cross section is disclosed.

In this forging apparatus, the central portion of the guideway is connected to the upper and lower bodies by pins, and there is a gap between the guideway and the slide along the sliding surface. The upper and lower dies are respectively connected to the upper and lower bodies, and the side dies are connected to the slide. The die is fixed to each body and slide by a P-shaped clamp and a tie pin protruding through the body and slide, and the clamp has each protrusion inserted into a groove provided in the body, the slide and the die. to provide

Although a repair-free service period can be secured to a certain extent through the application of the guideway of the F-shaped section, misalignment and jamming of the sliding surfaces of the body and slide, malfunction of the slide movement, and the guideway are damaged. Due to the wear of the guideway due to the lack of bonding strength of the guideway to the body causing damage, there is still a problem in that productivity and reliability are not sufficient.

In addition, there is no particular limitation on the material of the body in the conventional 4-die forging apparatus. In the case of a body made of steel used in a general forging apparatus, it is continuously transmitted through the die during the hot or cold forging process. It cannot withstand the heavy load and is prone to damage. Accordingly, maintenance costs due to periodic replacement of parts may increase, and device operation time may be reduced, which may increase the unit price of the final product.

Another problem that appears when the rigidity of the body is low is that the overall size of the forging device cannot be reduced. As described above, since the body is attached with various parts such as guideways around the body, and the slide operates in conjunction with the body, as the body size increases, the size of the guideway and slide must also increase. it gets bigger Therefore, if the body is made compact by making the body using high-strength and high-toughness materials, the entire forging device is also small, so that the installation space can be reduced, and there is an advantage that energy consumption can also be reduced during operation.

1. Russian Patent Publication No. 2283718 2. Korean Patent Publication No. 10-1189333

An object of the present invention is to provide a 4-die forging apparatus having a body made of a high-strength, high-toughness material.

In addition, another object of the present invention is to provide a 4-die forging device in which the die can be easily separated even if the internal screw constituting the die fixing means is worn or damaged.

According to an embodiment of the present invention, the upper body is movable with inclined surfaces formed toward both ends on the lower surface; a lower body having an inclined surface formed by improving both ends on the upper surface and being fixed; two side slides disposed between the upper body and the lower body, the upper portion having an inclined surface corresponding to the inclined surface of the upper body, and the lower portion having an inclined surface corresponding to the inclined surface of the lower body; a plurality of guideways dynamically connecting the upper body and the side slide, and the lower body and the side slide; an upper die fixed to a lower portion of the upper body; a lower die fixed to the upper portion of the lower body; two side dies fixed to one side of the side slide; and die fixing means for fixing the upper die, the lower die and the side die to the upper body, the lower body and the side slide, wherein the material of the upper body and the lower body is C: 0.30 to 0.50 wt%, Si: 0.10 to 0.45 wt%, Mn: 0.5 to 5.0 wt%, S: 0.05 wt% or less, P: 0.05 wt% or less, Cr: 0.5 to 7.0 wt%, Mo: 0.2 to 1.0 wt%, Cu: 0.3 wt% or less To provide a 4-die forging apparatus, which is an alloy steel containing a component of

Further, in the 4-die forging apparatus, the guideway has an E-shaped cross-section, is connected to the upper body or the fixed lower body through a central web thereof, and is connected to the side die by one protrusion of the E-shaped cross-section. A sliding surface that slides along the formed inclined surface may be formed.

In addition, the die fixing means is inserted into the shaft hole formed in the upper body, the lower body or the side slide, the first screw and the second screw are threaded and separated from each other, and each of the first screw and the second screw It may include a grip fastened to fix or release the fixing part of the upper die, the lower die or the side die, and a grip opening/closing means for opening and closing the grip according to the rotation of the first screw and the second screw. there is.

In addition, the grip opening/closing means includes a nut disposed inside and outside the grip to fix the grip, and a cap nut each fastened to outer peripheral portions of outer ends of the first screw and the second screw, As the first screw and the second screw reciprocate by rotation of the screw and the second screw, the opening/closing operation of the grip may be performed.

The grip opening/closing means includes a nut disposed inside the grip and a lock nut disposed outside the grip, and the nut and the lock nut are separated by rotation of the first screw and the second screw. By reciprocating on the first screw and the second screw, the opening/closing operation of the grip may be performed.

In addition, a support member may be disposed between the respective grips and the movable nut disposed on the outside thereof, with an elastic member interposed therebetween.

In addition, the four-die forging apparatus includes a body having fixing means for fixing the upper die, the lower die and the two side dies, and an extension plate extending radially from the body at a predetermined angle in four directions. It may further include a mandrel having a.

By the 4-die forging apparatus having a high-strength, high-toughness body according to an embodiment of the present invention, the maintenance cost of the apparatus can be reduced and the repair-free service period can be increased, and the size of the apparatus is reduced to reduce the size of the forging process It can reduce the space required for operation and energy consumption for operation.

In addition, according to the forging device according to an embodiment of the present invention, compared to a conventional guideway having an F-shaped cross-section, misalignment and jamming of the sliding surfaces of the body and the slide occurs, the operation synchronization defect of the slide, the guide It is possible to greatly reduce productivity and reliability degradation due to the wear of the guideway due to the lack of bonding strength of the guideway to the body that causes damage to the way.

In addition, according to the forging apparatus according to an embodiment of the present invention, even if the screw constituting the die fixing means is damaged or the tab is damaged in the state in which the die is fixed, the die through a simple process of separating the cap formed at the end separation is possible.

1 is a front view of a 4-die forging apparatus according to an embodiment of the present invention.
Figure 2 is a cross-sectional view taken along line AA of Figure 1, showing a guideway provided in the 4-die forging apparatus according to an embodiment of the present invention.
3 is an exploded perspective view of a guideway of a first type provided in a 4-die forging apparatus according to an embodiment of the present invention.
4 is an exploded perspective view of a guideway of a second type provided in a 4-die forging apparatus according to an embodiment of the present invention.
5 is a cross-sectional view taken along line BB of FIG. 1, showing a first type of die fixing means provided in a 4-die forging apparatus according to an embodiment of the present invention.
6 is a cross-sectional view taken along line BB of FIG. 1, illustrating a second type of die fixing means provided in a 4-die forging apparatus according to an embodiment of the present invention.
7A is a perspective view of a mandrel according to an embodiment of the present invention, and FIG. 7B is a cross-sectional view illustrating a state in which a die is in close contact with the mandrel.
8 is a view showing a state in which pressing is performed through a 4-die forging apparatus according to an embodiment of the present invention.
9 shows a state in which the die can be separated from the first type of die fixing means provided in the 4-die forging apparatus according to an embodiment of the present invention.
10 shows a state in which the die can be separated from the die fixing means of the second type provided in the 4-die forging apparatus according to an embodiment of the present invention.
11 is a front view showing a state in which a die is fixed to a mandrel by a bracket in a four-die forging apparatus.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, when a part 'includes' a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

1 is a front view of a 4-die forging apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along AA of FIG. 1, showing a guideway provided in the 4-die forging apparatus according to an embodiment of the present invention 3 is an exploded perspective view of a guideway of a first form provided in a 4-die forging apparatus according to an embodiment of the present invention, and FIG. 4 is provided in a 4-die forging apparatus according to an embodiment of the present invention It is an exploded perspective view of a guideway of a second form that becomes 6 is a cross-sectional view taken along line BB of FIG. 1, illustrating a second type of die fixing means provided in a 4-die forging apparatus according to an embodiment of the present invention, and FIG. 7A is a perspective view of a mandrel according to an embodiment of the present invention; and FIG. 7B is a cross-sectional view showing a state in which the die is in close contact with the mandrel.

The 4-die forging apparatus according to the present invention includes an upper body 1 having an inclined surface formed on its lower surface and being movable, a lower body 2 having an inclined surface formed on its upper surface and being fixedly arranged, and the upper body (1) and two side slides 3 , 4 dynamically connected to the lower body 2 , an upper die 6 fastened to the upper body 1 , and a lower die fastened to the lower die 2 . 7), side dies 8, 9 fastened to the two side slides 3, 4, and dynamically between the upper and lower bodies 1, 2 and the two side slides 3, 4 a guideway (5) for connecting;

The upper and lower bodies 1 and 2 need to be made of a material having high toughness and high strength, in order to withstand a high load received during forging for a long time to reduce the risk of damage. An alloy steel containing nickel, chromium, molybdenum and vanadium is preferable as a material having such high toughness and high strength.

In one embodiment according to the present invention, the material used to make the upper and lower bodies is an alloy steel containing nickel, chromium, molybdenum and vanadium, and the composition is shown in Table 1 below.

ingredient C Si Mn Ni S P Cr Mo V Cu Furtherance
(weight%) 0.35 0.20 0.30 3.2 0.02 0.02 1.3 0.40 0.15 0.2

Nickel (Ni), chromium (Cr), molybdenum (Mo), and vanadium (V) included in the alloy steel used as the upper and lower body materials are elements that can increase the strength and toughness of the steel. Therefore, more than a certain amount should be included, but if it is too much, carbides are generated excessively, which causes a problem in that toughness is rather deteriorated or cost is increased, so it is necessary to manage it at an appropriate level. In addition, silicon (Si) and manganese (Mn) are elements added to control impurities in the steelmaking process, and must be controlled to an appropriate level, while other impurities such as sulfur (S), phosphorus (P), and copper (Cu) are constant. It is preferably below the level. The composition range of alloy steel suitable to satisfy these requirements is C: 0.30 to 0.50 wt%, Si: 0.10 to 0.45 wt%, Mn: 0.5 to 5.0 wt%, S: 0.05 wt% or less, P: 0.05 wt% or less, Cr: 0.5 to 7.0% by weight, Mo: 0.2 to 1.0% by weight, Cu: 0.3% by weight or less, and the remainder is composed of Fe and other unavoidably contained impurities.

When the alloy steel having the above composition is applied to the body of the forging apparatus according to the present invention, the toughness of the body is strengthened to prevent fatigue fracture and the like occurring during the forging process, thereby improving durability and providing excellent rigidity. The forging device itself can be implemented compactly.

The side slides 3 and 4 have inclined surfaces corresponding to the inclined surfaces formed on the upper and lower bodies 1 and 2, and are connected to the upper and lower bodies 1 and 2 by the guideway 5. and is displaceable.

The guideway may be formed in two forms.

A guideway 5 of a first type, as shown in FIGS. 2 and 3 , has an E-shaped cross-section, through a center web 5a and a first end web 5b to the upper body 1 or A sliding surface that is rigidly connected to the lower body 2 and allows the side slides 3 and 4 to slide through a gap formed between the second end web 5c and the side slides 3 and 4 . (5d) is provided.

A wear-resistant plate 5e is fixed to the sliding surface 5d by using a plurality of bolts, and both ends of the wear-resistant plate 5e are wrapped around both ends of the second end web 5c from the outside. A bracket 5f is formed. This bracket 5f prevents the wear-resistant plate 5e from flowing in the longitudinal direction even with strong friction generated during the use of the forging device, so that the bolt holes formed in the sliding surface 5d and the wear-resistant plate 5e It is possible to suppress the occurrence of deformation or deformation or damage to the bolts to be fastened. Through this, the replacement cycle of the wear-resistant plate 5e can be greatly extended.

On the other hand, the guideway 5' of the second type, as shown in FIG. 4, has an E-shaped cross section, and passes through the center web 5a' and the first end web 5b' to the upper body ( 1) or firmly connected to the lower body 2, the side slides 3 and 4 can slide through the gap formed between the second end web 5c' and the side slides 3 and 4 A sliding surface 5d' is provided to allow

A wear-resistant plate 5e' is fixed to the sliding surface 5d' using a plurality of bolts, and steps 5f' are formed at both ends of the sliding surface 5d', and the wear-resistant plate 5e' is formed. The plate 5e' is fixed by bolts after both ends of the wear-resistant plate 5e' are inserted into the sliding surface 5d'. Since the wear-resistant plate 5e' is embedded in the sliding surface 5d' even with strong friction generated during the use of the forging device, it does not flow in the longitudinal direction, and thus the sliding surface 5d and the wear-resistant plate 5d' It is possible to suppress the occurrence of deformation in the bolt hole formed in the plate 5e, or deformation or damage to the bolt to be fastened. Through this, the replacement cycle of the wear-resistant plate 5e' can be greatly extended.

When the upper body 1 moves up and down by the driving force applied to the upper body 1 , the guideway 5 connected to the upper body 1 slides the side of the guideway 5 . Sliding along (3, 4) makes a reciprocating motion, and in conjunction with this, the side slides (3, 4) reciprocate in the horizontal direction in FIG. 1, and the die fixed to the side slides (3, 4) Let the action of merging or opening be made.

The die fixing means may also be formed in two forms.

The first type of die fixing means 10' is inserted into an axial hole provided on one side of the upper and lower bodies 1, 2 or side slides 3, 4, as shown in FIG. It has alternating threads at both ends and extends to a predetermined length, and includes a first screw 11 and a second screw 12 separated from each other. Grooves 11b and 12b for rotating the first screw 11 and the second screw 12 through a tool such as a wrench are provided at outer ends of the first screw 11 and the second screw 12 . is formed

A first nut 13 is disposed on the innermost side of the first screw 11 , a spacing adjusting member 14 is disposed on the outside of the first nut 13 , and an outer side of the spacing adjusting member 14 is disposed on the outside of the first nut 13 . A grip 15 having a grip portion for fixing the die is disposed, and a first support member 16 is disposed outside the grip 15 , and is disposed between the grip 15 and the first support member 16 . A leaf spring (s) capable of absorbing the displacement caused by shock or heat generated in the process of using the forging device is disposed. A second nut 17 is disposed outside the first support member 16 , a cap nut 18 is disposed at an outside end of the first screw 11 , and a cap nut 18 is disposed outside the cap nut 18 . A fixing pin nut 19 capable of installing a fixing pin for preventing rotation of the cap nut 18 when the forging device is used is disposed. In addition, the second screw (12) side is also provided with the same configuration as the first screw (11) symmetrically.

The die fixing means 10 ′ of the second type is inserted into the axial holes provided on one side of the upper and lower bodies 1 and 2 or the side slides 3 and 4, as shown in FIG. 6 , It has alternating threads at both ends and extends to a predetermined length, and includes a first screw 11' and a second screw 12' separated from each other. Ring-shaped protrusions 11a and 12a are formed near the outer ends of the first screw 11 and the second screw 12, and the first screw 11' and Grooves 11b' and 12b' through which the second screw 12' can be rotated are formed.

A nut 14' is disposed on the innermost side of the first screw 11', and a grip 15' having a grip portion for fixing a die is disposed on the outside of the nut 14', and the grip 15 '), a lock nut 16' is disposed on the outside, and between the grip 15' and the lock nut 16', a plate capable of absorbing the displacement caused by impact or heat generated during the use of the forging device. A spring (s') is arranged. A cap nut 18 ′ covering an end of the first screw 11 is disposed outside the ring-shaped protrusions 11a ′ and 12a ′. Also, the second screw 12' has the same configuration as that of the first screw 11'.

In the forging apparatus according to the present invention, the dies 6 , 7 , 8 , 9 can be replaced at once through the mandrel 20 . To this end, fastening holes for fixing to the mandrel 20 are formed in the dies 6 , 7 , 8 and 9 , and the fastening holes are formed in the mandrel during the exchange of the dies 6 , 7 , 8 and 9 . It is used to secure the dies or to prevent flow between adjacent dies.

The mandrel 20, as shown in Figs. 7 and 8, has a body 21 that has a substantially rectangular cross section and extends enough to cover the dimensions of the die, and the mandrel 20 from the four corners of the body. ) and four extension plates 22 extending to a predetermined length while maintaining an angle corresponding to the dimensions machined on the die fixed to the dies. In addition, fixing means for selectively fixing the dies 6 , 7 , 8 and 9 may be formed on the body 21 .

The dies 6 , 7 , 8 and 9 are respectively disposed in a space partitioned by the body 21 and the extension plate 22 , and the dies 6 , 7 , 8 and 9 are arranged in the extended space. After moving until they are in close contact with the plate 22 and fixing them by means such as the bracket 23, they can be moved or mounted at once from the forging device.

The operation process of the 4-die forging apparatus according to an embodiment of the present invention, having the structure as described above, is as follows.

When the movable press crossbeam moves upward, the upper body 1 moves upward together with the upper die 6, with the side slides 3 and 4 connected to the guideway 5 and the side dies 8 and 9 connected thereto. ) is moved to open the workspace.

Next, an object to be forged is supplied to the work space by a manipulator (not shown). And the press starts to perform a working stroke, the movable press cross beam moves the upper body 1 to the workpiece, and swage the workpiece in the vertical direction between the upper and lower dies 6, 7 make it At the same time, the side slides 3 and 4, which transport the side dies 8 and 9, are also moved toward the work piece in the horizontal direction in the drawing to swage in the horizontal direction.

When the swaging of the workpiece is completed, the movable press cross beam moves upward to open the press working space, and one forging operation is completed.

If it is necessary to replace the die used for the forging operation, the mandrel 20 is provided to the open press workspace, and then the dies 6, 7, 8, 9 are connected to the extension plate 22 of the mandrel 20. ) until it adheres to the

Then, when the first screw and the second screw 11, 12 of the die fixing means 10 of the first type shown in FIG. 5 are rotated counterclockwise, as shown in FIG. 9, the cap nut 18 ), the first and second screws 11 and 12 fixed to the outside are moved to the outside, and the grip 15 is in a state in which the die is released. This allows the dies 6 , 7 , 8 , 9 to be separated from the upper and lower body 1 , 2 and the side slides 3 , 4 .

On the other hand, when the first screw and the second screw 11', 12' of the die fixing means 10' of the second type shown in FIG. 6 are rotated counterclockwise, as shown in FIG. 10, the nut 14' and the lock nut 16' move outward along the first screw 11', and in conjunction with this, the grip 15 also moves in the direction to release the die, so that the dies 6 , 7 , 8 , 9 are in a state in which they can be separated from the upper and lower bodies 1 , 2 and the side slides 3 , 4 .

Thereafter, as shown in FIG. 11 , the two dies are interconnected at the sides using a bracket 23 and fixed to the mandrel 20, using a separate transfer means, the dies 6, 7 , 8 , 9 are separated from the upper and lower bodies 1 , 2 and the side slides 3 , 4 .

As described above, after the die is separated from the body and the slide from the differently selectively applied die holding means, a mandrel 20 carrying a fixed set of dies to be replaced is provided by a manipulator to the working space of the device, the mandrel The die set fixed at 20 is transferred to a tool rack where it is stored, and it can be stored and used without removing the die from the mandrel.

In addition, the mandrel 20 according to the present invention varies from the initial fastening position by the dimension spanning the side even if grinding is performed on the machining surface of the die by the extension 21 extending in four directions from the body Since this does not occur, the same mandrel 20 can be continued to be used even after die processing.

On the other hand, in a state in which the die is fixed, damage occurs to the tabs formed on the first and second screws 11 and 12 or other nuts provided in the die fixing means 10 due to impact during the forging process, etc. When the rotation operation cannot be performed, the two types of die fixing means can be disassembled from the die in the following way.

First, in the case of the die fixing means 10 of the first type, the fixing pin fitted to the cap nut 18 is separated, and the cap nut 18 is rotated to separate it from the forging device. Then, the first screw and the second screw (11, 12) are separated, and the remaining parts constituting the die fixing means (10) are fixed to the upper and lower bodies (1, 2) or the side slides (3, 4). Therefore, it is possible to separate the die fixing means 10 from the forging device as a whole.

Through this process, even if the die fixing means 10 is damaged, the die can be easily separated from the forging device, and damaged parts in the die fixing means 10 can be easily replaced.

Next, in the case of the die fixing means 10' of the second type, the cap nut 18' is rotated to separate it from the forging device. Then, the first screw and the second screw 11', 12' are separated, and the remaining parts constituting the die fixing means 10' are the upper and lower bodies 1, 2 or the side slides 3, 4 Since it is not fixed to the forging device, the whole die fixing means 10' can be separated from the forging device. Through this process, even if the die fixing means 10' is damaged, the die can be easily separated from the forging device, and damaged parts in the die fixing means 10' can be easily replaced.

1: upper body 1a, 2a, 3a, 4a: inclined plane
2: lower body 3, 4: side slide
5: Guideway 5a: Center Web
5b: first end web 5c: second end web
5d: sliding face 5e: wear-resistant plate
5f: Bracket 6: Upper die
7: lower die 8, 9: side die
10: die fixing means 11: first screw
12: second screw 13: first movable nut
14: gap adjustment member 15: grip
16: first support member 17: second movable nut
18: cap nut 19: fixing pin nut
20: mandrel 21: body
22: extension plate 23: bracket

Claims (6)

An upper body having an inclined surface formed toward both ends on the lower surface and moving;
a lower body having an inclined surface formed by improving both ends on the upper surface and being fixed;
two side slides disposed between the upper body and the lower body, the upper portion having an inclined surface corresponding to the inclined surface of the upper body, and the lower portion having an inclined surface corresponding to the inclined surface of the lower body;
a plurality of guideways dynamically connecting the upper body and the side slide, and the lower body and the side slide;
an upper die fixed to a lower portion of the upper body;
a lower die fixed to the upper portion of the lower body;
two side dies fixed to one side of the side slide; and
die fixing means for fixing the upper die, the lower die and the side die to the upper body, the lower body and the side slide;
The material of the upper body and the lower body is C: 0.30 to 0.50 wt%, Si: 0.10 to 0.45 wt%, Mn: 0.5 to 5.0 wt%, S: 0.05 wt% or less, P: 0.05 wt% or less, Cr: 0.5 ~7.0% by weight, Mo: 0.2 to 1.0% by weight, Cu: containing less than 0.3% by weight and the remainder is an alloy steel containing Fe and other unavoidably contained impurities, 4-die forging apparatus. According to claim 1,
The guideway has an E-shaped cross-section, and is connected to the upper body or the fixed lower body through its central web, and a sliding surface is formed by one protrusion of the E-shaped cross-section to slide along an inclined surface formed in the side die, , a 4-die forging device. According to claim 1,
The die fixing means is inserted into the shaft hole formed in the upper body, the lower body or the side slide, the first screw and the second screw are threaded and separated from each other, and are fastened to each of the first screw and the second screw. a grip for fixing or releasing the fixing part of the upper die, the lower die, or the side die, and a grip opening/closing means for opening and closing the grip according to the rotation of the first screw and the second screw; die forging device. 4. The method of claim 3,
The grip opening/closing means includes a nut disposed inside and outside the grip to fix the grip, and a cap nut each fastened to the outer periphery of the outer ends of the first screw and the second screw,
The first screw and the second screw reciprocate by rotation of the first screw and the second screw, whereby the opening/closing operation of the grip is made. 4. The method of claim 3,
The grip opening/closing means includes a nut disposed inside the grip and a lock nut disposed outside the grip,
The opening/closing operation of the grip is made by reciprocating the nut and the lock nut on the first screw and the second screw by rotation of the first screw and the second screw. 5. The method of claim 4,
A four-die forging apparatus, wherein a support member is disposed between each of the grips and a movable nut disposed outside the grips with an elastic member interposed therebetween.

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