KR102021566B1 - Pipe forging apparatus - Google Patents

Abstract

The present invention relates to a pipe forging device that can be formed to shape the pipe end of the outer diameter surface, the inner diameter surface and the thickness differently in the longitudinal direction of the pipe, so as to press the outer diameter surface of the pipe portion, the outer diameter of the pipe An outer diameter portion forging die formed of a plurality of divided molds formed with a receiving groove portion for accommodating a portion of the face, and installed in a longitudinal direction of the pipe so as to be able to move forward and backward to the receiving groove portion of the outer diameter portion forging die at a first speed. A gripper for conveying the pipe and a protrusion inserted into the inner diameter portion of the pipe to pressurize the inner diameter surface of the pipe portion so that the pipe may be moved forwards and backwards, and the pipe may be moved by the gripper. In the same direction as the pipe enters with the second speed when entering into the receiving groove A first speed control signal is applied to the gripper to allow the gripper to transfer the pipe at the first speed, and a drive unit for applying a driving force to move the inner diameter forging die to move forward and backward. The controller may be configured to apply a second speed control signal to the driving unit so that the inner diameter forging die may move at the second speed.

Description

Pipe forging apparatus

The present invention relates to a pipe forging apparatus, and more particularly, to a pipe forging apparatus which can shape the shape of the pipe end in the outer diameter surface, the inner diameter surface and the thickness differently in the longitudinal direction of the pipe.

In general, forging processing is a processing method for forming a product of a desired shape while minimizing material loss by pressing and punching a solid metal material into a predetermined shape. As the core parts of the basic industry can be mass-produced, the scope of application is expanding.

Among such forgings, upset forging is a forging method for increasing the diameter of a material by pressing the material in the longitudinal direction and is most widely used among all forging processes in terms of production. In particular, the application of the upset forging method, which has advantages in precision and productivity, is increasing when producing pipe-shaped metal parts having different inner wall thicknesses. In addition, die forging is a method of forging by placing a material in between, by fixing the lower mold to the anvil and the upper mold to the lower end of the hammer, using a forced upper and lower mold engraved the required forging.

However, such a conventional pipe forging device has a problem that the work efficiency is low because there is no forging device capable of simultaneously performing the type forging and the upset forging, and the upset forging has a high defect rate such as severe fluctuations in the pipe thickness and clogging. there was. In addition, the conventional upset forging method for manufacturing pipe forgings having different thicknesses of the inner wall of the pipe is not only complicated in process but also suffers from a large number of processes, resulting in poor physical properties of the material and inferior processing precision.

The present invention is to solve a number of problems, including the above-described problems, and simultaneously perform the mold forging and upset forging, the outer diameter and the inner diameter and the thickness of the pipe end in the longitudinal direction of the pipe in one process only It is an object of the present invention to provide a pipe forging device that can be molded differently. However, these problems are exemplary, and the scope of the present invention is not limited thereby.

According to one aspect of the invention, a pipe forging apparatus is provided. The pipe forging device may include: an outer diameter forging die formed of a plurality of split molds in which receiving grooves are formed to receive a portion of the outer diameter surface of the pipe so as to pressurize the outer diameter surface of the pipe portion; A gripper which is installed to be able to move forward and backward in the longitudinal direction of the pipe and transfers the pipe to the receiving groove of the outer diameter forging die at a first speed; A protruding portion inserted into the inner diameter portion of the pipe is formed to press the inner diameter surface of the pipe portion so as to be forward and backward installed in the receiving groove so that the pipe enters the receiving groove portion by the gripper. An inner diameter forging die having a speed and moving in the same direction as the pipe enters; A driving unit for applying a driving force to move the inner diameter forging die back and forth; And a first speed control signal applied to the gripper to allow the gripper to transport the pipe at the first speed, and a second speed control signal to the drive unit to allow the inner diameter forging die to move at the second speed. It may include a control unit for applying a.

In the pipe forging apparatus, the control unit is configured to move the inner diameter forging die in the same direction as the conveying direction of the pipe at the second speed slower than the first speed at which the pipe enters the receiving groove. The second speed control signal, which is slower than the first speed control signal, may be applied to the driver.

In the pipe forging device, the outer diameter forging die may be forged by pressing the outer diameter portion of the pipe portion while a plurality of the divided molds repeatedly move forward and backward in the width direction of the pipe.

In the pipe forging device, the outer diameter forging die may have a first inclined surface formed on the inner diameter surface of the receiving groove so that the outer diameter portion and the thickness of the pipe portion may be gradually changed along the longitudinal direction of the pipe. Can be.

In the pipe forging apparatus, the receiving groove may be formed with a chamfer at the inlet so that the pipe can easily enter.

In the pipe forging device, the inner diameter forging die, the body is formed in a shape corresponding to the receiving groove with a first diameter so as to advance back and forth in the receiving groove; The protrusion having a second diameter smaller than the first diameter and formed at one side of the body and inserted into an inner diameter of the pipe to press and forge the inner diameter of the pipe; And a stepped portion formed between the body and the protrusion to contact one end of the pipe entering the receiving groove.

In the pipe forging device, the protrusion, the second inclined surface may be formed on the outer diameter surface so that the inner diameter and the thickness of the portion of the pipe may be gradually changed along the longitudinal direction of the pipe.

In the pipe forging device, a heating device for heating the pipe to a predetermined temperature, so that the forging of the pipe can be easily made; may further include.

In the pipe forging apparatus, the outer diameter forging die may have a depth of the receiving groove within 3 times the diameter of the pipe so that buckling does not occur in the longitudinal direction of the pipe when the pipe is forged.

According to one embodiment of the present invention made as described above, the mold forging and upset forging at the same time, the shape of the pipe end in one process only the outer diameter surface and the inner diameter surface and the thickness differently formed in the longitudinal direction of the pipe can do.

Accordingly, the pipe forging process is simple, the cost reduction effect is large, and the working speed is increased, thereby improving productivity. In addition, the mechanical properties of the final pipe forging is superior to the conventional, it is possible to implement a pipe forging device having the effect of extending the life of the punch and mold used in production. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view schematically showing a pipe forging apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of the pipe forging apparatus of FIG. 1.
3 to 5 are cross-sectional views schematically illustrating a forging process of the pipe forging apparatus of FIG. 1.
FIG. 6 is a cross-sectional view schematically illustrating a pipe forging manufactured by forging by the pipe forging apparatus of FIG. 1.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of description.

Embodiments of the present invention will now be described with reference to the drawings, which schematically illustrate ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, embodiments of the inventive concept should not be construed as limited to the specific shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a perspective view schematically illustrating a pipe forging apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically illustrating the pipe forging apparatus 100 of FIG. 1.

First, as shown in Figure 1, the pipe forging apparatus 100 according to an embodiment of the present invention, the outer diameter forging die 10, the gripper 20, the inner diameter forging die 30 And a driver 40 and a controller (not shown).

As shown in FIG. 1, the outer diameter forging die 10 includes a receiving groove 11 capable of receiving a portion of the outer diameter surface of the pipe P so as to pressurize the outer diameter surface of the portion of the pipe P. It may be formed of a plurality of divided mold (M) formed. At this time, as shown in (a) and (b) of Figure 2, the outer diameter portion forging die 10, while the plurality of divided molds (M) repeats the forward and backward in the width direction of the pipe (P), Forging may be performed by pressing an outer diameter portion of a portion of the pipe P.

More specifically, the outer diameter forging die 10 is composed of four divided molds M1, M2, M3, and M4, with each divided mold M1, M2, M3, and M4 centered on the pipe P. It can be arranged at 90 degrees. In addition, each of the divided molds M1, M2, M3, and M4 can press the outer diameter portion of the pipe P while repeating the forward and backward movement around the pipe P. FIG.

At this time, each of the divided molds (M1, M2, M3, M4) is synchronized by the synchronization device so that the forging of each portion of the outer diameter portion of the pipe (P) can be made constant so that forward and backward are the same speed and stroke ( Stroke).

For example, a forward and backward cylinder for driving the respective divided molds M1, M2, M3, and M4 is connected to a control unit, and the control unit transmits a control signal to each of the forward and backward cylinders so that the forward and backward amounts of the forward and backward cylinders are the same. Can be authorized. In addition, the forward and backward cylinders for driving the respective divided molds M1, M2, M3, and M4 may be mechanically synchronized using a gear combination, a pulley and a belt combination, and the like.

Each of the divided molds M1, M2, M3, and M4 may be a structure having appropriate strength and durability capable of pressing the outer diameter of the pipe P and forging into a predetermined shape. However, each of the divided molds M1, M2, M3, and M4 is not necessarily limited to Figs. 1 and 2, and is a member of a wide variety of materials that can press the outer diameter of the pipe P to forge it into a constant shape. Can be applied.

Accordingly, the outer diameter portion of the pipe P may be forged into a predetermined shape by the forward and backward movement of each of the divided molds M1, M2, M3, and M4 of the outer diameter forging die 10. For example, the outer diameter forging die 10 is formed on the inner diameter surface of the receiving groove 11 so that the outer diameter portion and the thickness of a portion of the pipe P may be gradually changed along the longitudinal direction of the pipe P. An inclined surface 11a may be formed. At this time, the receiving groove 11, the chamfer (C) may be formed at the inlet so that the pipe (P) can easily enter.

As shown in FIG. 1, the gripper 20 is installed so as to be able to move forward and backward in the longitudinal direction of the pipe P, and to the receiving groove 11 of the outer diameter forging die 10 at a first speed V1. The pipe P can be conveyed. More specifically, the gripper 20 can convey the pipe P while fixing a part of the pipe P and advancing back and forth in the longitudinal direction of the pipe P. At this time, the feed rate of the gripper 20 may be adjusted by the control unit.

In addition, the inner diameter forging die 30 has a protrusion 32 inserted into the inner diameter portion of the pipe P so as to pressurize the inner diameter surface of a portion of the pipe P, and is moved forward and backward in the receiving groove 11. The pipe P may move in the same direction as the pipe P enters with the second speed when the pipe P enters the accommodation groove 11 by the gripper 20. At this time, one side of the inner diameter forging die 30, the driving unit 40 for applying a driving force to the inner diameter forging die 30 can move forward and backward may be installed.

More specifically, the inner diameter forging die 30, the body 31 is formed in a shape corresponding to the receiving groove 11 with a first diameter (D1) so as to advance back and forth in the receiving groove (11), The second diameter (D2) smaller than the first diameter (D1) is formed on one side of the body 31, is inserted into the inner diameter of the pipe (P) to press the forging process of the inner diameter of the pipe (P) It may include a step portion 33 formed between the protruding portion 32 and the body 31 and the protruding portion 32 and in contact with one end of the pipe (P) entering the receiving groove portion (11). At this time, although not shown, the protrusion 32 may be formed with a second inclined surface on the outer diameter surface so that the inner diameter portion and the thickness of a portion of the pipe P may be gradually changed along the longitudinal direction of the pipe P. have.

For example, the gripper 20 enters the pipe P into the receiving groove 11 of the outer diameter forging die 10 at a first speed V1, and the inner diameter forging die 30 is the outer diameter forging die ( In the receiving groove 11 of 10) it can move backward at the second speed (V2) in the same direction as the pipe (P) entering.

At this time, the controller (not shown) applies the first speed control signal to the gripper 20 so that the gripper 20 can transfer the pipe P at the first speed V1, and the inner diameter forging die 30 is applied to the gripper 20. The second speed control signal may be applied to the driving unit 40 for driving the inner diameter forging die 30 so that) may move at the second speed V2.

In addition, the control unit, the internal diameter forging die 30 and the conveying direction of the pipe (P) at a second speed (V2) slower than the first speed (V1) in which the pipe (P) enters the receiving groove (11). The second speed control signal, which is slower than the first speed control signal, may be applied to the driver 40 to move in the same direction.

Therefore, when the pipe P enters the receiving groove 11 of the outer diameter forging die 10 at the first speed V1 by the gripper 20, the inner diameter forging die 30 is driven to the first speed V1. By moving backward at a second speed V2 slower than), one end of the pipe P and the stepped portion 33 of the inner diameter forging die 30 collide within the receiving groove 11, thereby providing one end of the pipe P. Negative forging may occur.

At this time, each of the divided molds M1, M2, M3, and M4 of the outer diameter forging die 10 forges the outer diameter surface of the pipe P while repeating forward and backward, and protrudes the inner diameter forging die 30. 32 can be inserted into the pipe P to forge the inner diameter surface of the pipe P. FIG. Accordingly, while the inner diameter forging die 30 moves slower than the pipe P in the same direction as the conveying direction of the pipe P, a collision occurs with one end of the pipe P, thereby forging the one end of the pipe P. By offsetting the impact generated during machining, it is possible to prevent the deformation of the pipe (P) during the forging process of one end of the pipe (P) and to further improve the processing quality.

In addition, if the length of the forging portion is too long compared to the diameter of the pipe (P) may be buckling in the longitudinal direction of the pipe (P). In order to prevent this, the outer diameter forging die 10, it may be preferable that the depth of the receiving groove 11 is formed within three times the diameter of the pipe (P).

In addition, although not shown, a heating device (not shown) for heating the pipe P to a predetermined temperature may be additionally installed so that forging of the pipe P may be easily performed. As a result, the forging processing portion of the pipe P may be induced to be more smoothly formed by hot forging the pipe P.

Therefore, the pipe forging device 100 according to an embodiment of the present invention, simultaneously performing the type forging and upset forging of the pipe (P), and the shape of one end of the pipe (P) in one process only outer diameter and inner diameter surface And the thickness can be molded differently in the longitudinal direction of the pipe.

Therefore, the process of forging the pipe P is simple, so that the cost reduction effect is large, and the working speed is increased, thereby improving productivity. In addition, the material mechanical properties of the final pipe (P) forging is excellent compared to the conventional, it can have the effect of extending the life of the punch and mold used for production.

3 to 5 are cross-sectional views schematically illustrating a forging process of the pipe forging apparatus 100 of FIG. 1, and FIG. 6 schematically illustrates a pipe P forging manufactured by forging the pipe forging apparatus 100 of FIG. 1. It is sectional drawing to show.

As shown in FIGS. 1 and 3, the gripper 20 transports the pipe P toward the receiving groove 11 of the outer diameter forging die 10 at a first speed V1, and forging the inner diameter forging. The die 30 may be moved backward at a second speed V2 slower than the first speed V1 in the same direction as the conveying direction of the pipe P.

Then, as shown in FIG. 4, the inner diameter forging die 30 is moved backward at a second speed V2 that is slower than the first speed V1, which is the feed speed of the pipe P, so that the outer diameter forging die 30 In the receiving groove 11 of 10) can be closer and closer. At this time, each of the divided molds M of the outer diameter forging die 10 may press the outer diameter surface of the pipe P while repeating forward and backward.

Subsequently, as shown in FIG. 5, the end 33 of the inner diameter forging die 30 and one end of the pipe P collide in the receiving groove 11 of the outer diameter forging die 10. Forging can be done. At this time, each of the divided molds M1, M2, M3, and M4 of the outer diameter forging die 10 forges the outer diameter surface of the pipe P while repeating forward and backward, and protrudes the inner diameter forging die 30. 32 can be inserted into the pipe P to forge the inner diameter surface of the pipe P. FIG.

Accordingly, while the inner diameter forging die 30 moves slower than the pipe P in the same direction as the conveying direction of the pipe P, a collision occurs with one end of the pipe P, thereby forging the one end of the pipe P. By offsetting the impact generated during machining, it is possible to prevent the deformation of the pipe (P) during the forging process of one end of the pipe (P) and to further improve the processing quality.

Accordingly, as shown in FIG. 6, the outer diameter surface of one end of the pipe P is gradually changed from the first diameter d1 to the second diameter d2, and the inner diameter surface is gradually changed accordingly. The thickness of one end portion may also gradually vary from the first thickness T1 to the second thickness T2. At this time, the third thickness T3 of the intermediate portion of the forging molding portion of the pipe P is formed to be different from the first thickness T1 and the second thickness T2, so that the overall thickness of the forging molding portion of the pipe P is divided. It can be forged uniformly.

Therefore, the pipe forging device 100 according to an embodiment of the present invention, simultaneously performing the type forging and upset forging of the pipe (P), and the shape of one end of the pipe (P) in one process only outer diameter and inner diameter surface And the thickness can be molded differently in the longitudinal direction of the pipe.

Therefore, the process of forging the pipe P is simple, so that the cost reduction effect is large, and the working speed is increased, thereby improving productivity. In addition, the material mechanical properties of the final pipe (P) forging is excellent compared to the conventional, it can have the effect of extending the life of the punch and mold used for production.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: outer diameter forging die
20: gripper
30: internal diameter forging die
40: drive unit
P: pipe
M: Split Mold
100: pipe forging device

Claims (12)

An outer diameter portion forging die formed of a plurality of divided molds in which a receiving groove is formed to receive a portion of the outer diameter surface of the pipe so as to pressurize the outer diameter surface of the pipe portion;
A gripper which is installed to be able to move forward and backward in the longitudinal direction of the pipe and transfers the pipe to the receiving groove of the outer diameter forging die at a first speed;
A protruding portion inserted into the inner diameter portion of the pipe is formed to press the inner diameter surface of the pipe portion so as to be forward and backward installed in the receiving groove so that the pipe enters the receiving groove portion by the gripper. An inner diameter forging die having a speed and moving in the same direction as the pipe enters;
A driving unit for applying a driving force to move the inner diameter forging die back and forth; And
The first speed control signal is applied to the gripper to allow the gripper to transport the pipe at the first speed, and the second speed control signal is applied to the drive unit to allow the inner diameter forging die to move at the second speed. It includes a control unit for applying,
The control unit,
The second slower than the first speed control signal so that the inner diameter forging die can move in the same direction as the conveying direction of the pipe at the second speed slower than the first speed at which the pipe enters the receiving groove; Applying a speed control signal to the drive unit,
The inner diameter forging die,
And for colliding with one end of the pipe while moving slower than the pipe in the same direction as the conveying direction of the pipe in the receiving groove of the outer diameter forging die. delete The method of claim 1,
The outer diameter forging die,
And a plurality of the divided molds press and forge the outer diameter portion of the pipe portion while repeating forward and backward in the width direction of the pipe. The method of claim 1,
The outer diameter forging die,
And a first inclined surface is formed on the inner diameter surface of the receiving groove so that the outer diameter portion and the thickness of the portion of the pipe can be gradually changed along the longitudinal direction of the pipe. The method of claim 4, wherein
The receiving groove portion,
Pipe forging apparatus, the chamfer is formed at the inlet so that the pipe can easily enter. The method of claim 1,
The inner diameter forging die,
A body having a first diameter so as to move forward and backward in the accommodation groove and formed in a shape corresponding to the accommodation groove;
The protrusion having a second diameter smaller than the first diameter and formed at one side of the body and inserted into an inner diameter of the pipe to press and forge the inner diameter of the pipe; And
A stepped portion formed between the body and the protruding portion and in contact with one end of the pipe entering the receiving groove portion;
Including, pipe forging device. The method of claim 6,
The protrusion,
And a second inclined surface is formed on the outer diameter surface so that the inner diameter and the thickness of the portion of the pipe can be gradually changed along the longitudinal direction of the pipe. The method of claim 1,
A heating device for heating the pipe to a predetermined temperature so that forging of the pipe can be easily performed;
Further comprising, pipe forging apparatus. The method of claim 1,
The outer diameter forging die,
A pipe forging apparatus, wherein a depth of the receiving groove is formed within three times the diameter of the pipe so that buckling does not occur in the longitudinal direction of the pipe when the pipe is forged. An outer diameter portion forging die formed of a plurality of divided molds, in which a receiving groove portion for receiving a portion of the outer diameter surface of the pipe is formed so as to pressurize the outer diameter surface of the pipe portion; And a gripper for transferring the pipe to the receiving groove of the outer diameter portion forging die at a first speed; and a protrusion inserted into the inner diameter portion of the pipe to pressurize an inner diameter surface of the pipe portion. An inner diameter forging die installed in the accommodating groove so as to be moved forward and backward and moving in the same direction as the pipe enters with the second speed when the pipe enters the accommodating groove by the gripper; A driver for applying a driving force to allow the neck forging die to move back and forth; And a first speed control signal applied to the gripper to allow the gripper to transport the pipe at the first speed, and a second speed control signal to the drive unit to allow the inner diameter forging die to move at the second speed. As a pipe forging method using a pipe forging apparatus comprising a;
The gripper transports the pipe at the first speed toward the receiving groove of the outer diameter forging die, and the inner diameter forging die is moved backward at the second speed in the same direction as the conveying direction of the pipe. Moving step; And
A pipe processing step in which the pipe is forged while the inner diameter forging die in the backward movement in the receiving groove of the outer diameter forging die collides with one end of the pipe being transported by the gripper;
Including, pipe forging method. The method of claim 10,
In the pipe processing step,
The outer diameter forging die is forged by pressing the outer diameter portion of the pipe portion while the plurality of divided molds repeats the forward and backward in the width direction of the pipe, and the protrusion of the inner diameter forging die is inserted into the pipe. And forging the inner diameter surface of the pipe. The method of claim 10,
In the pipe movement step,
The inner diameter forging die is moved backward at the second speed which is slower than the first speed which is the conveying speed of the pipe, so that the inner diameter forging die and one end of the pipe are closer in the receiving groove of the outer diameter forging die. Losing, pipe forging method.

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