KR101229919B1

KR101229919B1 - Hot forming apparatus and forming method thereof

Info

Publication number: KR101229919B1
Application number: KR1020100106436A
Authority: KR
Inventors: 김병년
Original assignee: 주식회사화신
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2013-02-05
Also published as: KR20120045108A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot forming apparatus and a molding method thereof, and more particularly, to a hot forming apparatus and a molding method capable of preventing a part from being damaged by a high heat generated during a molding process.
The present invention, the first mold, the second mold combined with the first mold to form a seating portion, a heating part for supplying heat to the work object inserted into the seating portion, and supplying a working fluid to the inside of the seating object It provides a hot forming apparatus including a supply unit for injecting a working fluid therein, and a heat radiating unit for radiating heat transferred to the supply unit.
In addition, the present invention comprises the steps of (a) inserting the workpiece to the mounting portion formed by combining the first mold and the second mold and heating the first mold and the second mold, (b) driving the heat dissipation unit, (C) it provides a hot forming method comprising the step of contacting the supply to the heat dissipation unit and spraying the working fluid to the seating portion to supply the working fluid inside the workpiece.

Description

Hot Forming Apparatus and Forming Method {HOT FORMING APPARATUS AND FORMING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot forming apparatus and a molding method thereof, and more particularly, to a hot forming apparatus and a molding method capable of preventing a part from being damaged by a high heat generated during a molding process.

The products produced by the hot forming process is various, but the present invention will be described taking as an example a torsion beam or trailing arm of a rear wheel suspension of an automobile.

Since the torsion beam of the vehicle rear wheel suspension device is provided with trailing arms at both ends, the torsion beam functions to maintain the attitude of the vehicle from torsion with respect to the centrifugal force generated when the vehicle is turning.

Therefore, the torsion beam and the trailing arm require strong torsional rigidity and bending rigidity.

The trailing arm is disposed in the front-rear direction of the vehicle, and a torsion beam is provided between the center portions of the pair of trailing arms.

Since the torsion beam is connected to the center portion of the trailing arm, a torsional rigidity and a bending stiffness of a predetermined value or more are required, so that a cross-sectional area is larger than that of the trailing arm.

Therefore, it is difficult to manufacture a trailing arm by inserting a core into a pipe-shaped workpiece.

In order to solve this problem, a trailing arm is manufactured by a hot forming method of supplying a working fluid into a pipe-shaped workpiece to widen the central diameter of the pipe-shaped workpiece.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

In general, the trailing arm has to be formed with a larger diameter compared to both ends of the trailing arm at the center portion where the torsion beam is connected. Therefore, since the hot forming process is performed with the supply part supplying the working fluid inside the pipe-shaped workpiece, the hot forming process is performed. There is a problem that the supply part is damaged by the high heat generated during the molding process.

Therefore, there is a need for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot forming apparatus and a method for forming the same, which can prevent a part from being damaged by a high temperature generated during a molding process.

In order to achieve the above object, the present invention, the first mold, the second mold combined with the first mold to form a seating portion, the heating unit for supplying heat to the work object inserted into the seating portion, It provides a hot forming apparatus comprising a supply unit for supplying a working fluid into the seating portion to inject the working fluid inside the workpiece, and a heat dissipation unit for radiating heat transferred to the supply unit.

The seating part may include a coupling hole part into which the supply part is inserted, and an expansion pipe part having a larger cross-sectional area than the coupling hole part.

The heat dissipation part may include a heat dissipation block having a through hole part so that the supply part inserted into the coupling hole part passes.

In addition, the heat dissipation block is characterized in that made of a material having a low thermal conductivity compared to the material forming the first mold and the second mold.

The heat dissipation block may include a first heat dissipation block installed on the first mold and a second heat dissipation block installed on the second mold and coupled to the first heat dissipation block to form the through hole. do.

In addition, the heat dissipation block is characterized in that the cooling passage in which the coolant is circulated and the groove portion forming the through hole.

The cooling passage may include a suction passage through which cooling water flows, a discharge passage through which cooling water is discharged, and a branch passage connecting the suction passage and the discharge passage and extending toward the groove portion.

In addition, the heating unit is characterized in that it comprises a heater installed in the first mold or the second mold.

In addition, the supply portion, the nozzle in contact with the heat radiating portion and inserted between the first mold and the second mold to supply a working fluid to the seating portion, and installed in the nozzle is operated at the interval between the nozzle to the seating portion It characterized in that it comprises a sealing member for preventing the fluid is lost.

In addition, the present invention comprises the steps of (a) inserting the workpiece into the mounting portion formed by combining the first mold and the second mold and heating the first mold and the second mold, and (b) driving the heat dissipation unit; And, (c) it provides a hot forming method comprising the step of supplying a working fluid to the inside of the workpiece by injecting a working fluid to the heat dissipating portion and the seating portion.

In addition, the step (b) is characterized in that the cooling water is circulated inside the heat dissipation block is installed outside the coupling hole of the seating portion.

In addition, the present invention is characterized in that it further comprises the step of inserting the supply portion into the seating portion.

In addition, in the step (d), the supply part is inserted between the first mold and the second mold through the heat radiating portion.

The present invention has an advantage of preventing the supply part from being damaged by the high temperature generated during the hot forming process since the high temperature transmitted to the supply unit is radiated to the outside during the hot forming process.

1 is a perspective view showing a hot forming apparatus according to an embodiment of the present invention.
2 is an exploded perspective view showing a hot forming apparatus according to an embodiment of the present invention.
3 is a perspective view showing a cross-sectional view of the heat dissipation unit of the hot forming apparatus according to an embodiment of the present invention.
4 is a cross-sectional view showing a heat dissipation unit of a hot forming apparatus according to an embodiment of the present invention.
5 is a cross-sectional view showing a state in which the workpiece is inserted into the hot forming apparatus according to an embodiment of the present invention.
6 is a cross-sectional view showing an expanded state of the work object inserted into the hot forming apparatus according to an embodiment of the present invention.
7 is a flowchart illustrating a hot forming method according to an embodiment of the present invention.

Hereinafter, an embodiment of a hot forming apparatus and a molding method thereof according to the present invention with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view showing a hot forming apparatus according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a hot forming apparatus according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Cross-sectional view of the heat dissipation portion of the hot forming apparatus according to the perspective view.

In addition, Figure 4 is a cross-sectional view showing a heat dissipation unit of the hot forming apparatus according to an embodiment of the present invention, Figure 5 is a cross-sectional view showing a state in which the workpiece is inserted into the hot forming apparatus according to an embodiment of the present invention. 6 is a cross-sectional view showing an expanded state of a work object inserted into a hot forming apparatus according to an embodiment of the present invention.

1 to 6, a hot forming apparatus according to an embodiment of the present invention includes a first mold 12 and a second mold 14 coupled to the first mold 12 to form a seating portion 16. ), A heating part 30 for supplying heat to the work object inserted into the seating part 16, and a supply part 50 for supplying a working fluid into the seating part 16 to inject the working fluid into the work object. And a heat dissipation unit 70 for dissipating heat transferred to the supply unit 50.

When the first mold 12 and the second mold 14 are combined with the work object seated on the first mold 12, the work object is disposed inside the seating part 16, and the work is heated by the heating part 30. When the supply unit 50 is operated while the object is heated, and the working fluid is supplied to the inside of the workpiece, the external shape of the workpiece is hot formed in the shape of the seating portion 16.

At this time, since the supply unit 50 supplying the working fluid into the seating unit 16 is not overheated by the heat dissipation unit 70, the supply unit 50 can be prevented from being deformed or damaged.

The seating part 16 includes a coupling hole part 18 into which the supply part 50 is inserted, and an expansion part 19 having a larger cross-sectional area than the coupling hole part 18.

The first mold 12 and the second mold 14 are formed with concave grooves, and the center portion of the groove is formed deeper, so when the first mold 12 and the second mold 14 are combined, they are coupled to both ends of the mold. The hole portion 18 is formed, and an expansion pipe portion 19 having a larger diameter than the coupling hole portion 18 is formed inside the coupling hole portion 18.

Therefore, when the working object of the pipe member is inserted into the seating portion 16 and the working fluid is supplied to the inside of the working object while heating, a hot forming is performed in which the central portion of the working object is expanded into the expansion tube 19 shape.

Since the heat dissipation part 70 includes a heat dissipation block 72 having a through hole part 76 so that the supply part 50 inserted into the coupling hole part 18 passes, the supply part 50 inserted into the coupling hole part 18 is After passing through the heat radiation block 72 may be inserted into the seating portion 16 side through the coupling hole 18.

Before the supply unit 50 is inserted into the coupling hole 18, the supply unit 50 supplies the working fluid into the seating unit 16 in a state where the supply unit 50 is not in contact with the first mold 12 and the second mold 14. Therefore, the high heat transmitted from the heating unit 30 is difficult to be transmitted to the supply unit 50 by the heat dissipation block 72.

Therefore, it is possible to prevent the supply unit 50 from being deformed or damaged by the high temperature generated during the hot forming process.

Since the heat dissipation block 72 is made of a material having a low thermal conductivity compared to the materials forming the first mold 72a and the second mold 72b, the heat dissipation block 72 is formed of the first mold 72a and the second mold 72b. ) Is installed close to the high heat is transmitted from the heating unit 30 is blocked by the heat dissipation block 72 can be more effectively prevent the damage to the supply unit (50).

The heat dissipation block 72 is the first heat dissipation block 72a installed in the first mold 12 and the second heat dissipation block 14a and the first heat dissipation block 72a are combined to form a through hole 76. The second heat radiation block 72b is included.

When the first mold 12 and the second mold 14 are combined, the first heat dissipation block 72a installed on the first mold 12 and the second heat dissipation block 72b installed on the second mold 14 are provided. It is combined at the same time to form the same diameter as the coupling hole 18 and the through hole 76 to communicate with the coupling hole 18.

Therefore, when the supply part 50 is inserted into the through hole part 76, the first mold 12 and the second mold are inserted into the coupling hole part 18 after passing through the through hole part 76 while contacting the heat dissipation block 72. (14) It is inserted inside.

Since the heat dissipation block 72 is provided with a cooling passage 78 through which the coolant is circulated, and the grooves 74a and 74b forming the through-hole portion 76, the supply portion 50 is inserted into close contact with the inner wall of the through-hole portion 76. Cooling water circulated along the 78 to discharge the heat transferred to the supply unit 50 to the outside.

The cooling passage 78 connects the suction passage 78a through which the coolant flows, the discharge passage 78b through which the coolant is discharged, the suction passage 78a and the discharge passage 78b, and extends toward the groove portions 74a and 74b. Branch flow path 78c.

When the coolant flows into the heat dissipation block 72 through the suction passage 78a, the cooling water passes along the branch passage 78c adjacent to the groove portions 74a and 74b, and thus, from the supply portion 50 which contacts the groove portions 74a and 74b. Absorbs heat and is discharged to the outside of the heat dissipation block 72 along the discharge passage 78b.

The branch passage 78c extends to be adjacent to the groove portions 74a and 74b which are formed to be perpendicular to the suction passage 78a and the discharge passage 78b and form the through hole portion 76 of the heat dissipation block 72.

Therefore, the coolant introduced to the end of the branch passage 78c easily absorbs heat from the supply unit 50 while passing through the positions close to the grooves 74a and 74b to which the supply unit 50 contacts.

The heating part 30 includes a heater 32 installed in the first mold 12 or the second mold 14, and the seating part 16 is attached to the first mold 12 or the second mold 14. Since a plurality of hole portions 12a and 14a orthogonal to the seating portion 16 are formed while being spaced apart, when the heater 32 is installed in the plurality of hole portions 12a and 14a, the upper and lower portions of the seating portion 16 are heaters 32. Surrounded by).

Therefore, when power is applied to the heater 32 after the workpiece is inserted into the seat 16, heat is supplied from the upper and lower portions of the workpiece to the seat 16 so that the workpiece is uniformly heated over the entire surface. The effect will be.

The supply unit 50 is in contact with the heat dissipation unit 70 and inserted into the seating unit 16 to supply a working fluid to the inside of the work object, and the nozzle unit 52 is installed in the seating unit 16 and the nozzle. And a sealing member 54 which prevents the working fluid from being lost at intervals between the 52.

When the nozzle 52 is inserted into the through hole 76 or the coupling hole 18, the working fluid injected through the nozzle 52 flows into the seating part 16 and is filled in the work object of the pipe, and the working fluid If the injection of continuation of the pressure inside the workpiece is increased to form a hot forming process to expand the central portion of the workpiece of the pipe.

At this time, the working fluid is separated by the sealing member 54 installed on the circumferential surface of the nozzle 52 at the interval between the through-hole portion 76 and the nozzle 52 or at the interval between the coupling hole portion 18 and the nozzle 52. It is possible to prevent the loss.

Here, the sealing member 54 is made of a synthetic resin material to be in close contact with the inner wall of the through-hole 76 or the coupling hole 18, heat-resistant synthetic resin to prevent deformation or damage by heat transmitted from the heating unit 30 It is preferably made of a material.

When the sealing member 54 is disposed in close contact with the through hole 76, the heat is absorbed by the coolant circulated into the heat dissipation block 72, so that the sealing member 54 is exposed to the high heat transmitted from the heating unit 30. It is possible to prevent the deformation or breakage by the.

Looking at the hot forming method according to an embodiment of the present invention configured as described above are as follows.

7 is a flowchart illustrating a hot forming method according to an embodiment of the present invention.

1 to 7, the hot forming method according to an embodiment of the present invention inserts the workpiece into the seating portion 16 formed by combining the first mold 12 and the second mold 14 Heating the first mold 12 and the second mold 14 (S10), driving the heat radiating unit 70 (S20), and contacting the supply unit 50 to the heat radiating unit 70, and the first And spraying the working fluid between the mold 12 and the second mold 14 to supply the working fluid to the inside of the workpiece (S30).

When the workpiece of the pipe member is seated on the first mold 12 and then the first mold 12 and the second mold 14 are combined, the workpiece is inserted into the seating part 16, and the heating part 30 is inserted into the workpiece. Power is applied to heat the workpiece.

The step (S20) of driving the heat dissipation unit 70 is made by circulating the coolant inside the heat dissipation block 72 installed outside the coupling hole 18 of the seating unit 16, so that the nozzle 52 of the supply unit 50 is rotated. Is inserted into the through-hole portion 76 of the heat dissipation block 72, the heat transferred from the heating portion 30 is discharged to the outside by the cooling water.

The working fluid is injected from the nozzle 52 of the supply unit 50 while the heating target 30 heats the workpiece, and is filled into the workpiece.

Subsequently, if the supply of the working fluid is continued, the pressure inside the workpiece increases, and the hot forming is performed while the central portion of the workpiece is in close contact with the inner wall of the expansion pipe 19.

This embodiment further includes inserting the supply unit 50 into the seating unit 16 after the hot forming as described above (S40).

When the nozzle 52 of the supply unit 50 is inserted into the seating unit 16 along the coupling hole 18, the pressure inside the workpiece is further increased, thereby promoting the progress of the hot forming process.

In this case, since the sealing member 54 is installed on the circumferential surface of the nozzle 52 inserted into the through hole 76 and the coupling hole 18, the working fluid filled in the seating part 16 is lost to the outside. It can prevent.

In addition, since the supply unit 50 is inserted between the first mold 12 and the second mold 14 through the heat dissipation unit 70, heat is supplied from the sealing member 54 by the coolant circulating inside the heat dissipation block 72. By absorbing the sealing member 54 can be prevented from being deformed or broken.

As a result, it is possible to provide a hot forming apparatus and a method of forming the same, which can prevent the part from being damaged by the high heat generated during the forming process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

In addition, although the hot forming apparatus for the trailing arm and the forming method have been described as an example, this is merely illustrative, and the hot forming apparatus and the forming method of the present invention may be used for other products other than the trailing arm.

Accordingly, the true scope of the present invention should be determined by the following claims.

12: 1st mold 14: 2nd mold
12a, 14a: Hole part 16: Seating part
18: coupling hole 19: expansion pipe
30: heating part 32: heater
50 supply part 52 nozzle
54 sealing member 70 heat dissipation
72: heat dissipation block 72a: first heat dissipation block
72b: second heat radiation block 74a, 74b: groove
76: through hole 78: cooling passage
78a: suction passage 78b: discharge passage
78c: branch euros

Claims

First mold;
A second mold coupled to the first mold to form a seating portion;
A heating unit supplying heat to a work object inserted into the seating unit;
A supply unit supplying a working fluid into the seating part and injecting a working fluid into a work object; And
A heat dissipation unit for dissipating heat transferred to the supply unit;
The seat (1)
A coupling hole part into which the supply part is inserted; And
It includes an expansion pipe portion having a larger cross-sectional area than the coupling hole portion;
The heat dissipation part includes a heat dissipation block having a through hole part through which the supply part inserted into the coupling hole part passes;
The heat dissipation block is made of a material having a low thermal conductivity compared to the material forming the first mold and the second mold;
The heat dissipation block,
A first heat dissipation block installed in the first mold; And
A second heat dissipation block installed in the second mold and coupled to the first heat dissipation block to form the through hole;
The heat dissipation block is provided with a cooling channel through which the coolant is circulated and a groove forming the through hole;
The cooling channel
A suction flow path through which coolant flows;
A discharge passage through which cooling water is discharged; And
A branch passage connecting the suction passage and the discharge passage and extending toward the groove portion;
The branch flow path is formed to be orthogonal to the suction flow path and the discharge flow path and extends to be adjacent to the groove portion;
The heating unit includes a heater installed in the first mold or the second mold;
The first mold or the second mold is formed in the first mold or the second mold so as to surround the seating portion, a plurality of hole parts orthogonal to the seating portion and the heater is installed are formed in the first mold or the second mold. Device.

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The apparatus according to claim 1,
A nozzle in contact with the heat radiating part and inserted between the first mold and the second mold to supply a working fluid to the seating part; And
And a sealing member installed at the nozzle to prevent the working fluid from being lost at intervals between the nozzles to the seating part.

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