KR20160114467A - Press system for warm forming - Google Patents

Abstract

Disclosed is a warm forming press machine. According to an embodiment of the present invention, a warm forming press machine includes: a female mold installed in a bolster; a male mold installed on a slider in the upper part of the female mold to form a material inserted between the male mold and the female mold; a blank holder placed outside the male mold to be installed in the bolster through a cushion pin in the male mold; a radiating plate installed in the bolster along the outer edge of the blank holder and the slider along the outer edge of the male mold; a heating cartridge installed in each of the male mold, the female mold, and the blank holder along a formed surface; and a heating unit installed on the slider and the bolster along the outer edge of each of the male mold and the blank holder outside the radiating plate in order to form an atmosphere temperature between the male mold and the female mold. Therefore, the present invention is capable of enabling efficient warm forming by minimizing an energy loss.

Description

[0001] PRESS SYSTEM FOR WARM FORMING [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a press apparatus, and more particularly, to a warm-forming press apparatus capable of forming a magnesium alloy sheet material in a warm state.

In general, magnesium alloy sheet is attracting attention as a new material to replace iron or aluminum as lightweight material because density of metal structure is lower than aluminum.

In recent years, in North and Central America, magnesium alloy sheet materials have been applied to automobiles for the purpose of weight reduction, and various press forming techniques for forming such magnesium alloy sheet materials are required.

Such a magnesium alloy plate has a crystal lattice structure of HCP (Hexagonal Closed Packed Structure) metal. Due to such a crystal lattice structure, it is difficult to press form at room temperature and the non-bottom slip system is activated in a high temperature region And the hot press forming method is mainly applied.

The warm molding press method is performed in the middle range between the cold forming and the hot forming, and a heating unit is applied to the inside of the press mold to lower the yield strength of the material by a high-temperature mold and press- to be.

However, although such a magnesium alloy sheet material is excellent in thermal conductivity, and is excellent in fatigue and moldability at high temperatures, the development of a warm-forming press method corresponding to such a magnesium alloy sheet has not been universal.

In other words, a typical warm-tempering press apparatus only considers the moldability of the material, and thus it does not consider the heat insulation plan of the mold and the local heating plan for the molding unit, so that even when the partial molding is required, the energy loss rate is high, .

An embodiment of the present invention is to provide a warm-pressing press apparatus that enables effective warm-forming by arranging a heating cartridge inside a mold to enable heating of a material.

It is also an object of the present invention to provide a warm-forming press apparatus that prevents a decrease in durability of a press facility by a high-temperature die through a heat dissipating plate between a die and a press facility, and increases the thermal efficiency of the die by the heat dissipation plate.

It is also desirable to provide a warm-forming press apparatus in which the heating means and the heat-shielding means are formed along the outer peripheries of the blank holder and the upper mold to reduce the heat loss of the mold, shorten the preheating time of the mold, and reduce the overall cycle time .

In one or more embodiments of the present invention, there is provided a bolster, comprising: a lower die mounted on a bolster; an upper die mounted on a slider at an upper portion of the lower die to form a material to be inserted between the lower die and the lower die; And a blank holder mounted on the bolster through a pin, wherein the bolster is disposed along the outer periphery of the blank holder, and the heat sink is installed on the slider along the outer periphery of the upper mold, respectively; A heating cartridge installed inside each of the lower mold, the upper mold, and the blank holder along the molding surface; And a heating means provided on the bolster and the slider along the outer peripheries of the blank holder and the upper mold at the outside of the heat sink to form an atmospheric temperature between the lower and upper molds .

In addition, the warm-forming press apparatus includes a bolster and an air curtain provided on the slider along the outer circumference of the heating means to block the inside of the mold from the outside to maintain the atmospheric temperature by the heating means. As shown in FIG.

The heat dissipation plate may include an upper heat dissipation plate disposed in a vertical direction along an outer circumference of the upper mold and coupled to a lower surface of the slider; And a lower heat sink disposed vertically along the outer periphery of the blank holder and fastened to the upper surface of the bolster.

In addition, the upper heat sink may overlap a certain section of the lower heat sink when the upper and lower molds are mutually assembled.

The upper heat sink and the lower heat sink may be formed of a heat insulating material.

Also, the heating cartridge may include a top-type heating cartridge installed inside the upper mold corresponding to a molding surface of the material and an upper holding surface for holding an edge of the material. A lower mold heating cartridge provided inside the lower mold corresponding to a molding surface of the material; And a holder heating cartridge provided inside the blank holder in correspondence with a lower holding surface opposing the holding surface of the upper mold.

Further, the heating means may include: an upper lamp heater for forming an ambient temperature by a heating lamp provided on the slider along an outer periphery of the upper mold at an outer side of the heat sink; And a lower lamp heater for forming an atmospheric temperature by a heating lamp installed on the bolster along the outer peripheries of the blank holder on the outside of the heat sink.

The heating lamp may be an infrared lamp.

Further, the heating means includes an air injector installed on the slider along the outer circumference of the heating means to form an air curtain by spraying air in a vertically downward direction; And an air reflecting plate installed on the bolster along the outer circumference of the heating unit so as to face the air injector to reflect the air injected from the air injector in the vertical direction.

The air injector further includes an air tube fixed to a lower surface of the slider along an outer circumference of the upper lamp heater; An air nozzle formed along the lower end of the air tube; An air supply line connected to one side of the air tube to supply compressed air; And an air supply control valve provided on one side of the air supply line to supply and control the compressed air.

In addition, the air reflecting plate may be formed with a curved reflecting surface on the upper surface so as to upwardly change the direction of the air injected downward from the air injector.

Here, the curved surface may be semicircular.

In the embodiment of the present invention, the heating cartridge is disposed inside the metal mold so as to correspond to the forming portion of the workpiece, thereby heating the workpiece. Thus, the energy loss rate can be minimized and efficient warm molding can be achieved.

Further, it is possible to prevent the durability of the press facility by the hot mold from being lowered through the heat radiating plate between the mold and the press facility, and to increase the thermal efficiency with respect to the molded part by the heat radiating plate.

In particular, a magnesium alloy sheet material having excellent heat conductivity and high-temperature moldability can be molded in a warm state within a set temperature range only at a desired position, thereby enhancing product molding quality.

Further, the heat-generating means for forming the heating means and the air curtain by the heating lamps are formed on the outer peripheries of the blank holder and the upper mold, thereby reducing the heat loss of the mold and shortening the preheating time of the mold. .

1 is a side sectional view of a warm-forming press apparatus according to an embodiment of the present invention.
2 is a bottom view of a top part of a warm-forming press apparatus according to an embodiment of the present invention.
Figs. 3 and 4 are operation states before and after molding of the warm-forming press apparatus according to the embodiment of the present invention.

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

FIG. 1 is a side sectional view of a warm-forming press apparatus according to an embodiment of the present invention, and FIG. 2 is a bottom view of a warm-mold pressing apparatus according to an embodiment of the present invention.

1 and 2, a warm-forming press apparatus according to an embodiment of the present invention has a punch press apparatus as an example.

A lower mold 1 having a bottom surface shape of the product is mounted on a lower bolster 3 and an upper mold 5 having a top surface shape of the product is provided on an upper portion of the lower mold 1, (7).

A blank holder 9 is disposed outside the lower die 5 and is installed through the cushion pin 11 on the bolster.

That is, the upper die 5 presses the material 10 (see FIG. 3) inserted between the lower die 1 and the lower die 1 in a state where the material is regulated by the blank holder 9 to form a product.

The warm forming press apparatus according to the embodiment of the present invention further comprises a heat radiating plate 20, a heating cartridge 30, a heating means 40, and a heat shielding means 50.

The heat dissipation plate 20 is installed on the bolster 3 along the outer periphery of the upper die 5 along the slider 7 and the outer periphery of the blank holder 9.

That is, the heat sink 20 is disposed on the lower surface of the slider 7 by disposing the upper heat sink 21 in the vertical direction along the outer periphery of the upper die 5.

A lower heat sink 23 is disposed in a vertical direction along the outer periphery of the blank holder 9 and fastened to the upper surface of the bolster 3.

At this time, the upper heat sink 21 is configured to overlap a predetermined section (see FIG. 4) inside the lower heat sink 23 when the upper mold 5 and the lower mold 1 are mutually assembled.

The upper heat radiating plate 21 and the lower heat radiating plate 23 are applied as a heat insulating material having a low heat transfer coefficient and are disposed between a mold such as the upper mold 5 and the lower mold 1 and a press facility So that the durability of the press equipment due to the high-temperature mold can be prevented from decreasing.

The upper heat radiating plate 21 and the lower heat radiating plate 23 can increase the thermal efficiency of the forming part during warm forming of the material 10 inserted between the upper mold 5 and the lower mold 1. [

The heating cartridge 30 is installed inside the upper mold 5, the lower mold 1, and the blank holder 9 along the molding surface.

That is, the heating cartridge 30 is divided into the upper heating cartridge 31, the lower heating cartridge 33, and the holder heating cartridge 35.

The upper heating cartridge 31 is installed inside the upper mold 5 in correspondence with the forming surface FF1 of the blank 10 and the upper holding surface HF1 holding the edge of the blank 10 And the lower mold heating cartridge 33 is installed in the lower mold 1 in correspondence with the molding surface FF2 of the material 10. [

The holder heating cartridge 35 is installed in the blank holder 9 so as to correspond to a lower holding surface HF2 which faces the holding surface HF1 of the upper die 5.

Each of the heating cartridges 31, 33, and 35 is disposed by forming a cartridge groove (not shown) in the upper mold 5, the lower mold 1, and the blank holder 9, The controller C for supplying power to the power supply PS is controlled by the output control of the power supply PS or the power supply PS of the power supply PS, And controls the amount of heat of each of the heating cartridges 31, 33, and 35 by time control or the like.

At this time, when the magnesium alloy sheet material excellent in thermal conductivity and excellent in fatigue and moldability at high temperature is used as the material 10, the lower mold 1 heated by the heating cartridges 31, 33, The set temperature range of the upper mold 5 and the blank holder 9 can be controlled so as to be set within the range of 150 ° C to 200 ° C.

The heating means 40 is disposed at each outer side of the upper heat radiating plate 21 and the lower heat radiating plate 23 along the outer peripheries of the upper mold 5 and the blank holder 9, (3), and an ambient temperature is formed outside the upper mold (5) and the lower mold (1).

That is, the heating means 40 is constituted by an upper lamp heater 41 and a lower lamp heater 43. The upper lamp heater 41 is arranged on the outer side of the upper heat sink 21, The ambient temperature is formed by the heating lamp L provided on the slider 7 along the outer periphery.

The lower lamp heater 43 is disposed at an outer side of the lower heat sink 23 and along the outer peripheries of the blank holder 9 by a heating lamp L provided on the bolster 3, .

The upper lamp heater 41 and the lower lamp heater 43 are installed on the slider 7 and the bolster 3 through the upper heat radiating plate 21 and the lower heat radiating plate 23, Thereby preventing degradation.

The upper and lower lamp heaters 41 and 43 are also operated under the power of the power supply PS. The controller C for supplying power to the power supply PS is connected to the power supply PS, And controls the amount of heat of the upper and lower lamp heaters 41 and 43 by controlling the power supply time or the like.

Here, the heating lamp L according to the embodiment of the present invention may be an infrared lamp, but is not limited thereto.

The heat shielding means 50 is installed on the bolster 3 and the slider 7 along the outer circumference of the heating means 40 to form an air curtain (AC, see FIG. 3) So as to maintain the atmospheric temperature by the heating means (40).

That is, the heat shielding means 50 is composed of an air injector 51 and an air reflecting plate 53.

The air injector 51 is installed on the slider 7 along the outer circumference of the upper lamp heater 41 to form an air curtain (AC) by spraying compressed air in a vertically downward direction.

The air injector 51 has an air nozzle 51b formed on the lower surface of the slider 7 along the lower end of the air tube 51a fixed along the outer circumference of the upper lamp heater 41, One end of the air tube 51a is connected to the air supply line 55 so that the compressed air is supplied and controlled by the air supply control valve 57 formed on one side of the air supply line 55.

The air reflecting plate 53 is provided on the bolster 3 along the outer circumference of the lower lamp heater 43 so as to oppose the air injector 51 so that the compressed air In the vertical direction.

The air reflecting plate 53 has a curved reflecting surface 53a formed on the upper surface thereof so as to convert upward the direction of the compressed air injected downward from the air injector 51. The curved surface may be semicircular, But the present invention is not limited thereto.

Figs. 3 and 4 are operation states before and after molding of the warm-forming press apparatus according to the embodiment of the present invention.

Therefore, the operation of the warm-forming press apparatus having the above-described configuration will be described with reference to Figs. 3 and 4. Fig.

3, the upper mold 5 and the blank holder 9 are in an elevated state, and a magnesium alloy plate material is formed between the upper mold 5 and the lower mold 1 by the material 10, And is put into a heated state to a possible temperature.

At this time, the edge of the blank 10 is placed on the lower holding surface HF2 on the blank holder 9).

In this state, the controller C controls the power of the power supply PS to heat the upper, lower and holder heating cartridges 31, 33, 35 to the set temperature range.

The controller C controls the power supply PS to operate the upper and lower lamp heaters 41 and 43 to form the ambient temperature around the upper and lower molds 5 and 1, The air supply control valve 57 is operated to supply the compressed air into the air tube 51a through the air supply line 55 and spray the compressed air in the downward direction through the air nozzle 51b, And an air curtain (AC) is formed between the bolster (3).

At this time, the compressed air injected through the air nozzle 51b is deflected by the air reflecting plate 53 on the bolster 3 so as to reflect upward in the vertical direction to upwardly direct the flow of compressed air that is downwardly injected.

A high thermal layer HH is formed between the upper mold 5 and the lower mold 1 and the blank holder 9 at the boundary between the upper and lower heat sinks 21 and 23 and the upper and lower heat sinks 21, 23 and the air curtain (AC) formed by the compressed air, the amount of heat is lower than that of the high temperature layer HH and the amount of heat is lower than that of the outside air A temperature layer MH is formed.

At this time, the material 10 is put into the high-temperature layer HH and maintained in a state capable of warm forming.

4, the upper die 5 is lowered by the slider 7 so that the upper die 1 and the blank holder 9 hold the edges of the work 10, ) Is joined to the lower mold (1), the material (10) is formed into a warm state.

As described above, after the molding of the product is completed, the slider 7 is elevated again to raise the upper mold 5 and the blank holder 9 at the same time, and a hanger (not shown) is inserted to take out the molded article.

Therefore, in the warm-forming press apparatus according to the embodiment of the present invention, the upper mold, the lower mold and the holder heating cartridges 31, 33, 35 are disposed in the mold so as to correspond to the forming portion of the material 10, And the durability of the press facility by the high-temperature die is prevented by interposing the heat dissipating plates (21, 23) between the die and the press equipment, and the heat dissipating efficiency of the forming part is increased by the heat dissipating plates (21, 23).

The heat loss of the mold is controlled through the heating means 40 by the heating lamp L and the heat-generating means 50 which forms the air curtain AC on the outer peripheries of the blank holder 9 and the upper mold 5 Shorten the preheating time of the mold, thereby reducing the overall molding cycle time.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1: Lower
3: Bolster
5: HYPER
7: Slider
9: Blank holder
11: Cushion pin
10: Material
20: Heat sink
21, 23: upper and lower heat sinks
30: Heating cartridge
31, 33, 35: Upper, Lower, Holder Heating Cartridge
40: Heating means
41: upper lamp heater
43: Lower lamp heater
L: heating lamp
50:
51: Air Injector
51a: air tube
51b: air nozzle
53: Air reflector
53a:
55: Air supply line
57: Air supply control valve
C: Controller
PS: Power supply

Claims (21)

A lower mold mounted on a bolster, a top mold mounted on a slider at an upper portion of the lower mold to form a material to be inserted between the upper mold and the lower mold, a blank holder disposed outside the upper mold, In the press apparatus,
A bolster formed along an outer circumference of the blank holder, and a heat sink installed on the slider along an outer circumference of the upper mold;
A heating cartridge installed inside each of the lower mold, the upper mold, and the blank holder along the molding surface;
Heating means installed on the bolster and the slider along the outer peripheries of the blank holder and the upper mold at the outer side of the heat sink to form an ambient temperature outside the lower mold and the upper mold;
And a warm-pressing device. The method according to claim 1,
Further comprising a heating means provided on the bolster and the slider along an outer circumference of the heating means to form an air curtain to shut the inside of the mold from the outside to maintain the atmospheric temperature by the heating means, . 3. The method according to claim 1 or 2,
The heat sink
An upper heat sink disposed vertically along the outer periphery of the upper mold and fastened to a lower surface of the slider;
And a lower heat radiating plate which is disposed in a vertical direction along an outer circumference of the blank holder and is fastened to the upper surface of the bolster. The method of claim 3,
The upper heat sink
Wherein the upper mold and the lower mold overlap each other at a certain interval inside the lower heat sink when the upper and lower molds are mutually assembled. The method of claim 3,
The upper and lower heat sinks
A warm-forming press apparatus formed from a heat insulating material. 3. The method according to claim 1 or 2,
The heating cartridge
A hermetic heating cartridge provided inside the upper mold corresponding to a forming surface of the workpiece and an upper holding surface for holding an edge of the workpiece;
A lower mold heating cartridge provided inside the lower mold corresponding to a molding surface of the material;
And a holder heating cartridge provided inside the blank holder in correspondence with a lower holding surface opposed to the holding surface of the upper mold. 3. The method according to claim 1 or 2,
The heating means
An upper lamp heater for forming an atmospheric temperature by a heating lamp provided on the slider along an outer periphery of the upper mold at an outer side of the heat sink;
And a lower lamp heater for forming an atmospheric temperature by a heating lamp provided on the bolster along the outer peripheries of the blank holder on the outside of the heat sink. 8. The method of claim 7,
The heating lamp
A warm-forming press apparatus comprising an infrared lamp. 3. The method of claim 2,
The heat-
An air injector installed on the slider along an outer circumference of the heating means to form an air curtain by spraying air in a vertically downward direction;
And an air reflecting plate provided on the bolster along the outer circumference of the heating means so as to face the air injector and which reflects the air injected from the air injector in the vertical upward direction. 10. The method of claim 9,
The air injector
An air tube fixed to the lower surface of the slider along the outer periphery of the upper lamp heater;
An air nozzle formed along the lower end of the air tube;
An air supply line connected to one side of the air tube to supply compressed air;
And an air supply control valve that is provided at one side of the upper side of the air supply line to supply and control the compressed air. 10. The method of claim 9,
The air reflector
Wherein a curved reflective surface is formed on the upper surface so as to upwardly change the direction of the air injected downward from the air injector. 10. The method of claim 9,
The curved surface
Wherein the press forming device is semicircular. A lower mold mounted on a bolster, a top mold mounted on a slider at an upper portion of the lower mold to form a material to be inserted between the upper mold and the lower mold, a blank holder disposed outside the upper mold, In the press apparatus,
Upper and lower heat sinks respectively installed on the lower surface of the slider along the outer periphery of the upper mold and the upper surface of the bolster along the outer periphery of the blank holder;
A heating cartridge installed inside each of the lower mold, the upper mold, and the blank holder along the molding surface;
A heating means provided on the bolster and the slider along the outer peripheries of the blank holder and the upper mold at the outside of the heat sink to form an atmospheric temperature between the lower and upper molds;
An air injector installed on the slider along an outer circumference of the heating means to inject air in a vertical downward direction to form an air curtain to shut the inside of the mold from the outside to maintain the atmospheric temperature by the heating means;
An air reflecting plate installed on the bolster along the outer circumference of the heating means so as to face the air injector and reflecting the air injected from the air injector in the vertical direction;
And a warm-pressing device. 14. The method of claim 13,
The upper heat sink
Wherein the upper mold and the lower mold overlap each other at a certain interval inside the lower heat sink when the upper and lower molds are mutually assembled. 14. The method of claim 13,
The upper and lower heat sinks
A warm-forming press apparatus formed from a heat insulating material. 14. The method of claim 13,
The heating cartridge
A hermetic heating cartridge provided inside the upper mold corresponding to a forming surface of the workpiece and an upper holding surface for holding an edge of the workpiece;
A lower mold heating cartridge provided inside the lower mold corresponding to a molding surface of the material;
And a holder heating cartridge provided inside the blank holder in correspondence with a lower holding surface opposed to the holding surface of the upper mold. 14. The method of claim 13,
The heating means
An upper lamp heater for forming an atmospheric temperature by a heating lamp provided on the slider along an outer periphery of the upper mold at an outer side of the heat sink;
And a lower lamp heater for forming an atmospheric temperature by a heating lamp provided on the bolster along the outer peripheries of the blank holder on the outside of the heat sink. The method according to claim 13 or 17,
The heating lamp
A warm-forming press apparatus comprising an infrared lamp. 14. The method of claim 13,
The air injector
An air tube fixed to the lower surface of the slider along the outer periphery of the upper lamp heater;
An air nozzle formed along the lower end of the air tube;
An air supply line connected to one side of the air tube to supply compressed air;
And an air supply control valve that is provided at one side of the upper side of the air supply line to supply and control the compressed air. 14. The method of claim 13,
The air reflector
Wherein a curved reflective surface is formed on the upper surface so as to upwardly change the direction of the air injected downward from the air injector. 21. The method of claim 20,
The curved surface
Wherein the press forming device is semicircular.

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