KR20170027211A - Heating apparatus and method for hot stamping - Google Patents

Abstract

The present invention relates to a material heating apparatus and method for hot stamping and, more specifically, relates to a material heating apparatus and method for hot stamping which is capable of evenly heating a polygonal heterogeneous material by current application. According to an exemplary embodiment of the present invention, the material heating apparatus and method for hot stamping comprises: an electrode portion installed in opposite ends of a material including a main portion and a protrusion formed to protrude from the main portion, and having a plurality of electrodes; a power supply connected to the electrodes to supply a current; and a controller controlling the supply of the power supply.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot stamping material heating device,

The present invention relates to an apparatus and a method for heating a hot stamping material, and more particularly, to a hot stamping material heating apparatus and method capable of uniformly energizing heating a polygonal mold release material.

Generally, a vehicle body including a beam such as a bumper of an automobile is formed by pressing a steel-based steel sheet material, and the rigidity of these steel sheet materials greatly affects the collision stability.

Accordingly, recently, hot stamping technology, which is a hot press forming technique using a boron steel sheet, has been actively studied as shown in Fig. 1 in order to simultaneously satisfy the high strength and light weight of the steel sheet material.

That is, the hot stamping technique is a molding technique for heating the boron steel plate 11 at an appropriate temperature (about 900 deg. C), forming it once in the press die 13, and then rapidly cooling it to produce the high strength body part 15. [

The boron steel sheet 11 is a steel sheet to which a small amount of boron (B) is added. Boron is segregated in an atomic state at the austenite grain boundaries under an appropriate temperature condition to lower the free energy of the austenite grain boundaries, The ferrite nucleus formation is suppressed to remarkably improve the hardenability of the steel (the ability of the steel to be hardened by the formation of martensite upon quenching).

The hot stamping process using the boron steel plate 11 is a process of forming a boron steel sheet 11 having a ferrite structure having a tensile strength of about 500 to 800 MPs before molding by austenitizing at a high temperature of 900 DEG C or higher And then rapidly cooled to produce a molded article of martensite structure having a high tensile strength of about 1300 to 1600 MPS.

Therefore, hot stamping molded parts are 4 ~ 5 times higher in strength than general steel parts, and their weight can be reduced by up to 40% compared with conventional parts, so that light weight and high strength characteristics can be achieved at the same time.

In order to heat a typical hot stamping material, methods such as energization heating, heating through heating, near-infrared heating, far-infrared heating, and high-frequency induction heating can be applied. Particularly, in the case of hot-stamping a small-sized vehicle component, the energization heating method is mainly applied.

Electric current heating is a technique of heating a material by using heat of resistance generated by energization. Such an energization heating apparatus for energizing heating is compact, has a high heating rate, can improve productivity, and has an advantage in that the heating temperature can be easily controlled.

However, the conventional electrification heating device can be made only of a rectangular material, and it is not possible to uniformly heat a polygonal mold release material.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

An embodiment of the present invention provides a material heating apparatus and method for hot stamping capable of energizing heating a polygonal release material.

Further, the embodiment of the present invention provides a material heating apparatus and method for hot stamping capable of uniformly heating a cross-section of a release material.

In an embodiment of the present invention, an electrode unit is mounted on both ends of a workpiece including a main portion and a protrusion protruding from the main portion, the electrode portion being composed of a plurality of electrodes. A power supply connected to the electrode to supply a current; And a controller for controlling supply of the power supply unit.

The electrode unit may include a first electrode set including a first (+) electrode and a first (-) electrode mounted on one end and the other end of the main unit, respectively. And a second electrode set composed of a second (+) electrode and a second (-) electrode mounted on one end and the other end of the protrusion, respectively.

In addition, the first (+) electrode and the second (+) electrode may be arranged in a straight line.

In addition, the first (+) electrode, the first (-) electrode, the second (+) electrode and the second (-) electrode may be arranged in parallel with both ends of the work.

The hot-stamping material heating apparatus may further include a support provided at a position corresponding to the electrode to support the material.

The support may include a first support and a second support located on the lower surface of the main portion corresponding to the first electrode set; And a third support and a fourth support corresponding to the second electrode set on the lower surface of the protrusion.

The power supply further includes a first power supply for supplying current to the first electrode set; And a second power supply for supplying current to the second set of electrodes.

The controller controls the first power supply unit so that a current flows through the first electrode set to energize and heat the main unit to a set temperature. When the energization heating is completed in the main unit, the first power supply unit Off control to turn on and off the power supply.

In addition, the controller may have control logic for controlling the second power supply unit so that the current flows through the second electrode set, thereby energizing the protrusion to the set temperature.

According to another embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: positioning a workpiece including a main portion and a protrusion connected to one side of the main portion, Positioning a first set of electrodes at both ends of the main portion and positioning a second set of electrodes at both ends of the protrusion; Providing a first power supply unit electrically connected to the first electrode set and providing a second power supply unit electrically connected to the second electrode set; Supplying current from the first power supply unit to the first electrode set to energize the main unit; And supplying the current from the second power supply unit to the second electrode set to energize the protrusion to heat the material for hot stamping.

The embodiment of the present invention can improve the productivity compared with the electric heating because the material is energized by heating, and the investment cost can be reduced.

In addition, since the cross-section of the release material can be uniformly heated, the material ratio can be reduced.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a conceptual diagram of a general hot stamping process.
2 is a view illustrating a workpiece heating apparatus for hot stamping according to an embodiment of the present invention.
3 is a view showing a work according to an embodiment of the present invention.
4 and 5 are views showing a method of heating a material for hot stamping according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation principle of an apparatus and a method for heating a hot stamping material according to the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory of various embodiments for effectively illustrating the features of the present invention. Therefore, the present invention should not be limited to the following drawings and descriptions.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

In order to efficiently explain the essential technical features of the present invention, the following embodiments will appropriately modify, integrate, or separate terms to be understood by those skilled in the art to which the present invention belongs , And the present invention is by no means thereby limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view illustrating a workpiece heating apparatus for hot stamping according to an embodiment of the present invention.

Referring to FIG. 2, the hot-stamping material heating apparatus 100 includes an electrode unit 120, a support 150, a power supply 170, and a controller 200 for electrically heating the work 110.

The material 110 may be a polygonal mold releasing material 110. That is, the material 110 includes a main portion 113 and a protrusion 115 as shown in FIG.

The protrusion 115 is connected to the main part 113 and protrudes from the main part 113. The cross-section of each of the projecting portion 115 and the main portion 113 may be formed in a rectangular shape.

The material 110 may be a steel sheet to which boron (B) is added.

The electrode unit 120 is mounted on both ends of the work 110 and is composed of a plurality of electrodes. The electrode unit 120 includes a first electrode set 130 and a second electrode set 140.

The first electrode set 130 includes a first (+) electrode 133 and a first (-) electrode 135.

The first (+) electrode 133 and the first (-) electrode 135 are located at one end and the other end of the main portion 113. The first (+) electrode 133 and the first (-) electrode 135 may be arranged in parallel with each other, and may be disposed in parallel with both ends of the main portion 113.

The second electrode set 140 includes a second (+) electrode 143 and a second (-) electrode 145.

The second (+) electrode 143 and the second (-) electrode 145 are located at one end and the other end of the protrusion 115. The second (+) electrode 143 and the second (-) electrode 145 may be arranged in parallel to each other and may be parallel to the first (+) electrode 133 and the first (-) electrode 135 . The second (+) electrode 143 and the second (-) electrode 145 may be disposed parallel to both ends of the protrusion 115.

The second (+) electrode 143 may be disposed on a straight line with the first (+) electrode 133. That is, the first (+) electrode 133 and the second (+) electrode 143 may be disposed at one end of the work 110.

The support 150 is provided at a position corresponding to the electrode unit 120 and is located on the lower surface of the work 110. The support (150) supports the work (110).

The support 150 may be installed as many as the number of electrodes included in the electrode unit 120. That is, the support 150 includes a first support 161 to a fourth support 167.

The first support 161 is positioned in correspondence with the first (+) electrode 133 and the second support 163 is positioned in correspondence with the first (-) electrode 135.

The third support 165 is positioned in correspondence with the second (+) electrode 143 and the fourth support 167 is positioned in correspondence with the second (-) electrode 145.

The power supply 170 supplies current to the electrode unit 120. The power supply 170 includes a first power supply unit 180 and a second power supply unit 185.

The first power supply unit 180 is electrically connected to the first electrode set 130 to supply current to the first electrode set 130. In other words, the (+) terminal of the first power supply unit 180 is electrically connected to the first (+) electrode 133 and the (-) terminal of the first power supply 180 is electrically connected to the first (-) electrode 135.

The second power supply unit 185 is electrically connected to the second electrode set 140 to supply current to the second electrode set 140. That is, the (+) terminal of the second power supply unit 185 is electrically connected to the second (+) electrode 143 and the (-) terminal is electrically connected to the second (-) electrode 145.

The controller 200 controls the power supply 170 to supply current to the electrode unit 120. That is, the controller 200 controls the first power supply unit 180 so that current flows through the first electrode set 130 to energize the main unit 113 of the work 110 to the set temperature. The controller 200 controls the second power supply unit 185 so that the current flows through the second electrode set 140 so that the protrusion 115 of the work 110 is energized to the set temperature. At this time, the set temperature represents a temperature at which the material 110 is austenitized, and may be set differently according to the material 110. [ For example, if the material 110 is a boron steel sheet, the set temperature may be 900 ° C.

The controller 200 may be implemented as one or more microprocessors that operate according to the set control logic and the set control logic may include a series of instructions for performing electrification heating of the workpiece 110.

Hereinafter, a method for heating a material for hot stamping according to an embodiment of the present invention will be described.

4 and 5 are views showing a method of heating a material for hot stamping according to an embodiment of the present invention.

As shown in FIG. 4 (a), the work 110 is placed on the top of the support 150. That is, the work 110 including the main portion 113 and the protrusion 115 is positioned on the upper surface of the first support 161 to the fourth support 167.

The electrode unit 120 is positioned at both ends of the upper surface of the work 110, as shown in FIG. 4 (b). Specifically, the first electrode set 130 is positioned at both ends of the main portion 113. The first (+) electrode 133 and the first (-) electrode 135 are positioned so as to correspond to the first support 161 and the second support 163 at both ends of the main portion 113 .

And the second electrode set 140 is positioned at both ends of the protrusion 115. The second (+) electrode 143 and the second (-) electrode 145 are positioned so as to correspond to the third support 165 and the fourth support 167 at both ends of the protrusion 115, respectively.

As shown in FIG. 4 (c), a power supply 170 electrically connected to the electrode unit 120 is provided. That is, the first power supply unit 180 electrically connected to the first electrode set 130 is provided, and the second power supply unit 185 electrically connected to the second electrode set 140 is provided.

As shown in FIG. 5A, the controller 200 turns off the first power supply 180 and the second power supply 185. That is, the controller 200 controls the first power supply unit 180 to cut off the current supply to the first electrode set 130, and controls the second power supply unit 185 to change the current of the second electrode set 140 Cut off the supply.

As shown in FIG. 5B, the controller 200 controls the first power supply 180 to control the current supply to the first electrode set 130. That is, the first power supply unit 180 supplies current to the first electrode set 130. A current flows from the first (+) electrode 133 of the first electrode set 130 to the first (-) electrode 135 so that the main portion 113 is energized Heat it.

The controller 200 can energize and heat only the main part 113 by turning off the second power supply part 185. [

The controller 200 confirms whether or not the energization heating is completed in the main part 113 and turns off the first power supply part 180 when the energization heating is completed in the main part 113. [

The controller 200 controls the first power supply unit 180 so that the main unit 113 energizes and energizes the main unit 113 to the set temperature when the energization heating is not completed.

As shown in FIG. 5C, the controller 200 controls the second power supply 185 to control the current supply to the second electrode set 140. That is, the second power supply unit 185 supplies the first electrode set 130 with current under the control of the controller 200 when the energization heating is completed in the main unit 113. The current flows from the second (+) electrode 143 to the second (-) electrode 145 of the second electrode set 140 so that the protrusion 115 is electrically energized do.

As shown in FIG. 5 (d), when the heating of the protrusion 115 is completed, the material heating device for hot stamping is removed. Thus, it is possible to perform electrification heating on the mold release material 110 constituted by the main portion 113 and the protruding portion 115.

 Although the protrusion 115 is heated by energizing the main portion 113 and then the protrusion 115 is energized, the present invention is not limited to this. However, it is also possible to heat the main portion 113 by energizing the protrusion 115 have.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Material heating device for hot stamping
110: Material
113: main part
115:
120:
130: first electrode set
140: second electrode set
150: Support
170: Power supply
200:

Claims (15)

An electrode unit mounted on both ends of the workpiece with respect to a work including a main portion and a protrusion protruding from the main portion, the electrode unit being composed of a plurality of electrodes;
A power supply connected to the electrode to supply a current; And
A controller for controlling supply of the power supply;
And a heating device for heating the material for hot stamping. The method according to claim 1,
The electrode portion
A first electrode set comprising a first (+) electrode and a first (-) electrode mounted on one end and the other end of the main section; And
A second electrode set composed of a second (+) electrode and a second (-) electrode mounted on one end and the other end of the protrusion, respectively;
And a heating device for heating the material for hot stamping. 3. The method of claim 2,
Wherein the first (+) electrode and the second (+) electrode are disposed on a straight line. 3. The method of claim 2,
Wherein the first (+) electrode, the first (-) electrode, the second (+) electrode and the second (-) electrode are disposed in parallel with both ends of the work. 3. The method of claim 2,
And a support provided at a position corresponding to the electrode unit to support the workpiece. 6. The method of claim 5,
The support
A first support and a second support positioned on the lower surface of the main portion corresponding to the first electrode set; And
A third support located on the lower surface of the protrusion and corresponding to the second electrode set;
And a heating device for heating the material for hot stamping. 3. The method of claim 2,
The power supply
A first power supply for supplying current to the first set of electrodes; And
A second power supply for supplying a current to the second electrode set;
And a heating device for heating the material for hot stamping. 8. The method of claim 7,
The controller
The main unit is energized to the set temperature by controlling the first power supply unit so that the current flows through the first electrode set, and when the energization heating is completed in the main unit, energization heating to turn off the first power supply unit Material heating device for hot stamping with control logic. 8. The method of claim 7,
The controller
And a control logic for controlling the second power supply unit so that current flows through the second electrode set to energize and heat the protrusion to a set temperature. Positioning a workpiece including a main portion and a projection connected to one side of the main portion on a support top;
Positioning a first set of electrodes at both ends of the main portion and positioning a second set of electrodes at both ends of the protrusion;
Providing a first power supply unit electrically connected to the first electrode set and providing a second power supply unit electrically connected to the second electrode set;
Supplying current from the first power supply unit to the first electrode set to energize the main unit; And
Supplying current from the second power supply unit to the second electrode set to energize and heat the protrusion;
Wherein the hot stamping method comprises: 11. The method of claim 10,
The step of energizing the main part
Supplying a current from the first power supply to the first electrode set; And
Conducting and heating the main portion to a set temperature through a current flowing in the first (+) electrode and the first (-) electrode of the first electrode set;
Wherein the hot stamping method comprises: 12. The method of claim 11,
After the step of energizing and heating the main section to the set temperature
Turning off the first power supply;
Further comprising the step of heating the material for hot stamping. 12. The method of claim 11,
The step of energizing the protrusions
Supplying a current from the second power supply to the second set of electrodes; And
And heating the projecting portion to the set temperature through the second (+) electrode and the second (-) electrode of the second electrode set. 12. The method of claim 11,
The step of energizing and heating the main section to a set temperature
Electrically heating the main portion to a set temperature by resistance heat while electric charge moves from a first (+) electrode to a first (-) electrode of the first electrode set;
Wherein the hot stamping material is heated. 11. The method of claim 10,
Wherein the step of energizing and heating the protruding portion to a set temperature
The electric charge is heated from the second (+) electrode to the second (-) electrode of the second electrode set to the set temperature by resistance heat;
Wherein the hot stamping material is heated.

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