WO2015160081A1

WO2015160081A1 - Apparatus for firing by electric current application using multiple variable electrodes

Info

Publication number: WO2015160081A1
Application number: PCT/KR2015/001502
Authority: WO
Inventors: 홍성태; 박규열; 정용하; 박기동; 한흥남; 김문조; 양대호; 김장수; 김석현
Original assignee: 울산대학교 산학협력단
Priority date: 2014-04-15
Filing date: 2015-02-13
Publication date: 2015-10-22
Also published as: KR101541849B1

Abstract

The present invention relates to an apparatus for firing by electric current application using multiple variable electrodes. The present invention is characterized by comprising an upper mold, which is arranged/installed at an upper part and consists of a combination of upper forming pins, and a lower mold, which is installed at a lower part so as to correspond to the upper mold and consists of a combination of lower forming pins. By adjusting the area of the electrodes, the present invention can apply an electric current not only to a desired part only but also continuously to a curved surface.

Description

Electrical firing device using multiple variable electrodes

The present invention relates to an energizing firing apparatus using multiple variable electrodes. More particularly, the present invention relates to an energizing firing apparatus using multiple variable electrodes that can apply only a desired portion of electricity by controlling an area of the electrode, as well as continuously applying current on curved surfaces.

In general, energetic firing is a phenomenon in which the flow stress drops temporarily when a current is applied during plastic deformation of a metal material, and the moldability is remarkably improved when an electric current is applied with an appropriate energization variable without excessive temperature rise. Electrically assisted manufacturing (EAM) is a new concept of production technology combining energetic firing with existing production technology.

As an example of a manufacturing method using energetic firing, US Patent No. US 7302821 discloses a "manufacturing system comprising a controller that applies a current to a material to reduce flow stress while the material is deformed."

U. S. Patent No. US 7516640 also discloses a method of forming a metal blank in a forming tool.

In addition, Korean Patent Registration No. 1252530 discloses a molding apparatus capable of heating a molding portion with a simple configuration while ensuring durability of the molding portion of a mold, and a molding method by the same molding apparatus.

However, in the conventional energizing firing process, since the distance between the electrodes is far, heat resistance is generated and heat is generated. In addition, when the electrode is fastened to the mold, the compression load of the press is nonuniform, and wear problems of the electrode and friction with the material occur.

In order to solve the above problem, the present invention relates to an energizing firing apparatus using multiple variable electrodes. More specifically, it is an object of the present invention to provide an energizing firing apparatus using multiple variable electrodes that not only allow energizing a desired portion by controlling an area of an electrode but also continuously applying current on a curved surface.

In order to achieve the above object, the present invention is to press the object to be formed in the upper, the upper mold made of a combination of upper forming pins arranged on the upper; And a lower mold configured to press the object to be molded from the lower side, the lower mold including a combination of lower molding pins disposed below the upper molding pins. It provides an energizing firing apparatus using multiple variable electrodes, characterized in that it comprises a.

In addition, the upper mold and the lower mold is characterized in that the pressing by pressing at the same time up and down while applying energization firing to the object to be formed between the upper forming pins and the lower forming pins.

In addition, the upper forming pins and the lower forming pins are characterized in that the pressing operation is performed individually so that the contact is maintained as it is and the curved surface of the forming object is maintained even in the shape change of the forming object.

In addition, the upper forming pins and the lower forming pins are selectively used as an electrode according to the needs of the process among the pins that serve as a mold is characterized in that the conducting firing.

In addition, the upper forming pins and the lower forming pins are characterized in that the position of the electrode, the area of the electrode, and the energization direction is variably adjusted according to the selected upper forming pins and lower forming pins.

In addition, the energization direction is characterized in that the surface direction or the thickness direction of the molding object.

In addition, the present invention provides an energization firing apparatus using multiple variable electrodes, characterized in that a plurality of forming pins are arranged at one edge of one of the upper and lower molds.

In addition, the forming pins are characterized in that the pressing operation is performed individually so that the contact is maintained as it is in the molding process and the curved surface of the molding object is maintained.

In addition, all of the forming pins in contact with the molding object is used as an electrode.

In addition, only a plurality of forming pins selectively contacting the molding object is used as an electrode.

According to the energizing and firing apparatus using the multiple variable electrodes according to the present invention, it is possible not only to energize a desired part by controlling the area of the electrode, but also to continuously apply current even on a curved surface, such as the moldability of the molding object without excessive temperature rise. You can improve significantly.

1 is a block diagram of an energization firing apparatus using multiple variable electrodes according to a first embodiment of the present invention.

2 and 3 are diagrams illustrating a state of use of the energizing and firing apparatus using multiple variable electrodes according to the first preferred embodiment of the present invention.

4 and 5 are diagrams illustrating a state of use of the energizing and firing apparatus using multiple variable electrodes according to a second preferred embodiment of the present invention.

* Description of the sign *

10: upper mold 11: upper molding pin 20: lower mold

21: lower molding pin 30: molding object 100: mold

101: Molding pin

Hereinafter, a configuration of an energization firing apparatus using multiple variable electrodes according to the present invention will be described with reference to the accompanying drawings.

In the energizing and firing apparatus using the multiple variable electrodes according to the present invention, it is possible to energize only a desired portion by adjusting the area of the electrode, and also to apply a continuous current in a curved surface.

In the energizing and firing apparatus using the multiple variable electrodes according to the present invention, the upper die 10 and the upper die 10 which are installed on the upper portion as shown in FIG. It is installed on the lower side opposite to the lower mold 20 to press the molding object 30 to be molded.

Specifically, the upper mold 10 is composed of a combination of the upper forming pins 11 arranged in a row. Each of the upper forming pins 11 can individually move up and down vertically. This lifting operation can be done by hydraulic or pneumatic pressure.

Here, the upper forming pins 11 may have a form in which the upper forming pins 11 having a columnar shape are vertically and horizontally arranged in two dimensions. As another embodiment, the molding external shape of the lower mold 20 may be a predetermined shape, and press molding may be performed by pressing the upper mold 10 in accordance with the lower mold 20.

As another embodiment, it is possible to enable complex three-dimensional press molding such as shortening or lengthening the length of the upper forming pin 11 in a certain region of the entire forming portion of the upper mold 10 than the region of the other portion. Can be.

As another embodiment, the upper die 10 is formed into a faceted body to form the press-molded surface itself into a complex three-dimensional outline such as a three-dimensional curved surface, corrugation, and irregularities, thereby forming the molding object 30 into a three-dimensional outline. It may also be molded. As another embodiment, the upper forming pins 11 may be configured in a form of lining up a long plate rather than a pillar. This configuration can be equally applied to the upper mold 10 and the lower mold 20.

Each of the upper forming pins 11 press-forms at the same time performing energization firing to the forming object 30 when forming the forming object 30. As such, each of the upper molds 11 is used as a press forming pin and used as an electrode for energizing firing. According to the needs of the process, a certain upper forming pin 11 of the upper forming pins 11 may be selected to perform energization of use as an electrode.

Each of the upper forming pins 11 may variably adjust the position, area, conduction direction, etc. of the electrode during molding through electronic or mechanical control. The energization direction may be the surface direction or the thickness direction of the molding object 30.

Each of the upper forming pins 11 maintains contact between the forming object 30 throughout the forming process, so that the upper forming pin 11, that is, the contact between the electrode and the forming object 30 according to the shape change of the forming object 30. Can be solved.

The lower mold 20 is installed at the lower side opposite to the upper mold 10. The lower mold 20 press-forms the molding object 30 upwardly as opposed to the upper mold 10. The lower mold 20 is composed of a combination of lower forming pins 21 arranged in a row. Each of the lower forming pins 21 can individually move up and down vertically. This lifting operation can be done by hydraulic or pneumatic pressure.

The lower shaping pins 21 are configured identically to the upper shaping pins 11 described above except that the press shaping direction is operated upwardly opposite the upper shaping pins 11. Detailed description of the configuration of the lower forming pin 21 is omitted.

In the energizing and firing apparatus using the multiple variable electrodes according to the present invention, the planar molding (refer to the left figure of FIG. 1) as well as the surface shaping ( 1, the right figure) is also possible.

4 and 5 are diagrams illustrating a state of use of the energizing and firing apparatus using multiple variable electrodes according to a second preferred embodiment of the present invention. As shown in the drawing, the second embodiment of the present invention includes a plurality of forming pins 101 arranged in a plurality of edges of one side of an existing mold 100. In the second embodiment of the present invention, the forming pin 101 is replaced with only the electrode portion of the existing mold 100. 4 and 5, the forming pins 101 are illustrated in the upper mold 100, but may be installed in the lower mold.

Specifically, the forming pins 101 of the second embodiment according to the present invention are provided in plural and are configured in the same manner as the upper forming pins 11 of the first embodiment of the present invention. Detailed description of the configuration of the forming pin 11 is omitted. 4 and 5, four forming pins 1 to 4 are shown, but the present invention is not limited thereto and may be configured by a combination of four or less pins or a combination of four or more pins according to a press molding process. .

The forming pins 101 of the second embodiment according to the present invention are used as separate electrodes, respectively, and the electrode adjustment is controlled in real time according to the contact state between the molding object 30 and the mold 100 or the forming pins 101. .

Next, the operation of the first embodiment according to the present invention will be described. The operation of the first embodiment according to the present invention is as shown in Figures 2 and 3, the upper forming pins 11 are composed of 1 to 11 times from left to right and the lower forming pins 21 are 12 times from left to right. The case comprised from No. 22 to 22 will be described by way of example.

Specifically, in the energization firing apparatus using the multiple variable electrodes according to the present invention, as shown in FIG. 2, the upper forming

pins

2, 3 and 8, 9 are initially formed in the molding object 30 to be press-molded. (11) is used as an electrode (see the left figure in Fig. 2), and the part and the electrode to be energized by using the upper forming

pins

11, 4, 5 and 9 to 11 in the second half of the molding (see the right figure in Fig. 2). The areas of can be arbitrarily adjusted.

In addition, as shown in FIG. 3, the upper forming

pins

11, 3 and 8 and 9 are used as electrodes at the beginning of molding (see the left figure of FIG. 3), and the upper horizontal pins 4 to 6 are formed at the second half of the forming. Through-thickness in the all-the-surface energization of the molding object 30 during the process using (11) and the lower forming pins 21 to 15 to 17 (see the right figure in FIG. 3). ) The energization direction can be changed during the process.

Next, the operation of the second embodiment according to the present invention will be described. The description of the operation of the second embodiment according to the present invention is a case where the forming pins 101, as shown in Figures 4 and 5 are composed of 1 to 4 times from the left side of one side edge of the existing upper mold 100 to the right as an example. Explain.

As shown in FIG. 4, only the third and fourth molding pins 101 contacting the molding object 30 may be energized using the electrodes. In addition, as shown in FIG. 5, all of the first to fourth forming pins 101 may be used as electrodes to conduct electricity. Of course, the electrode control may be controlled in real time according to the contact state between the molding object 30 and the mold 100 or the forming pin 101.

As described above, in the energization firing apparatus using the multiple variable electrodes according to the present invention, the position, area, and energization direction of the electrode may be variably controlled by selective energization of the forming pins during molding of the molding object 30. As a result, press molding is performed simultaneously with the energizing firing property of the molding target object 30, so that the moldability of the molding target object 30 can be significantly improved.

In addition, according to the present invention, the forming pin, which is an electrode, may be in contact with the molding object 30 even when the molding object 30 is changed in shape such as a curved surface during molding. Therefore, even when the molding target object 30 is a curved surface, it is possible to apply a continuous current can significantly improve the moldability of the molding target object 30.

As mentioned above, although the preferred embodiment of this invention was described in detail with reference to an accompanying drawing, this is only an illustration and various deformation | transformation and change are possible within the scope of the technical idea of this invention. Therefore, the scope of the present invention will be defined by the description of the claims below.

Claims

Pressing the molding object in the upper portion, the upper mold made of a combination of upper forming pins arranged on the upper; And

A lower mold formed by a combination of lower forming pins installed on the lower portion opposite to the upper forming pin to press the object to be molded from the lower portion;

An energization firing apparatus using multiple variable electrodes, characterized in that it comprises a.
The method according to claim 1,

The upper mold and the lower mold,

An energizing firing device using multiple variable electrodes, characterized in that the pressing by pressing at the same time up and down while applying energization firing to the molding object placed between the upper forming pins and the lower forming pins.
The method according to claim 2,

The upper forming pins and the lower forming pins,

An energization firing apparatus using multiple variable electrodes, characterized in that the pressing operation is performed individually so that the contact is maintained as it is in the molding process and the curved surface of the molding object is formed.
The method according to claim 3,

The upper forming pins and the lower forming pins,

An energizing firing device using multiple variable electrodes, characterized in that the conducting firing is selectively used as an electrode according to process needs among the pins serving as a mold.
The method according to claim 4,

The upper forming pins and the lower forming pins,

An energization firing apparatus using multiple variable electrodes, characterized in that the position of the electrode, the area of the electrode, and the direction of conduction are variably adjusted according to the selected upper forming pins and lower forming pins.
The method according to claim 5,

The energization direction is,

An energization firing apparatus using multiple variable electrodes, characterized in that the surface direction or the thickness direction of the molding object.
An energization firing apparatus using multiple variable electrodes, characterized in that a plurality of forming pins are arranged on one side edge of one of the upper and lower molds.
The method according to claim 7,

The forming pins,

An energization firing apparatus using multiple variable electrodes, characterized in that the pressing operation is performed individually so that the contact is maintained as it is in the molding process and the curved surface of the molding object is formed.
The method according to claim 8,

An energization firing apparatus using multiple variable electrodes, characterized in that all of the forming pins in contact with the molding object is used as an electrode.
The method according to claim 9,

An energizing firing apparatus using multiple variable electrodes, wherein only a plurality of forming pins selectively contacting the molding object are used as electrodes.