KR101632895B1 - Pre-heating devise for hot stamping - Google Patents

Pre-heating devise for hot stamping Download PDF

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Publication number
KR101632895B1
KR101632895B1 KR1020140174335A KR20140174335A KR101632895B1 KR 101632895 B1 KR101632895 B1 KR 101632895B1 KR 1020140174335 A KR1020140174335 A KR 1020140174335A KR 20140174335 A KR20140174335 A KR 20140174335A KR 101632895 B1 KR101632895 B1 KR 101632895B1
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South Korea
Prior art keywords
roller
electrode roller
material panel
panel
electrode
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KR1020140174335A
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Korean (ko)
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KR20160068500A (en
Inventor
김지찬
이문용
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주식회사 성우하이텍
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Priority to KR1020140174335A priority Critical patent/KR101632895B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance heating

Abstract

A preheating device for hot stamping molding is disclosed. The preheating device for hot stamping molding according to an embodiment of the present invention is disposed in front of an electric heating furnace which supplies material from a material supply device to a molding device by heating the material panel to a high temperature state, A pair of mounting plates for preheating the panel at a predetermined temperature, the rear ends of which are respectively mounted on both front sides of the electric heating furnace; A plurality of conveyor rollers installed along the longitudinal direction between the respective mounting plates and moving the material panel supplied from the material feeder to the electric heating furnace; At least one support roller installed at a predetermined distance in the front-rear direction below the front end of the mounting plate and in rolling contact with the lower surface of the material panel; At least one first electrode roller provided on the front end of the mounting plate corresponding to the supporting roller and in rolling contact with an upper surface of the material panel; And at least one second electrode roller installed on the mounting plate at a position spaced rearward from the first electrode roller corresponding to the supporting roller and rolling on the upper surface of the material panel.

Description

PRE-HEATING DEVICE FOR HOT STAMPING [0002]

More particularly, the present invention relates to a hot-stamping preheating device for rapidly heating a material panel in front of an electric heating furnace before molding a material panel and preheating the material panel to a predetermined temperature or higher, .

Generally, the hot stamping technique is a molding technique in which a steel sheet is heated at an appropriate temperature (about 900 ° C), molded in a press mold in a press mold at once, and rapidly cooled to produce a high-strength component.

Such hot stamping molding includes hot forming, hot pressing and the like. As a material to be applied to the hot stamping molding, it contains carbon of about 0.2 wt%, and as an element for improving the heat treatment performance, Mn , And boron (B) are used.

Here, the boron steel sheet in which boron steel is used 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 boundary under an appropriate temperature condition and the free energy of the austenite grain boundary The ability to inhibit pro-eutectoid ferrite nucleation and to significantly improve the hardenability of the steel (the ability of the steel to cure by martensite formation).

The hot stamping method using the boron steel sheet is a method in which a boron steel sheet having a tensile strength of about 500 to 800 MPa before molding is austenitized at a high temperature of 900 DEG C or higher and molded at a high temperature, Followed by rapid cooling to obtain a molded article of martensite structure having a high tensile strength of about 1300 to 1600 MPa.

Accordingly, the hot stamping molded article can have a strength of 4 to 5 times higher than that of a general steel plate part, but its weight can be reduced by up to 40% compared with the conventional one, thereby achieving both weight saving and strength improvement of the vehicle body .

As a result, a general press apparatus is disadvantageous in that it is not suitable for press molding of a material having excellent high-temperature moldability, such as a boron steel sheet, because press forming of the material can always be performed only at room temperature.

In order to solve such shortcomings, in the hot stamping technique, a gas heating furnace or an electric heating furnace is conventionally used to heat a material.

However, in the conventional electric furnace as described above, the boron steel sheet as the material needs to be completely austenitized by heating to a temperature of 880 to 950 ° C or more of Ac3. When the thickness is more than a predetermined thickness, it takes at least 12 to 17 minutes, There is a problem that the process speed is lowered and the production cost is increased.

In addition, since the length of the electric heating furnace is considerably long and large, about 23 to 30 m, the cost is increased due to the enlargement of the facility, and even when the material is not supplied, Which causes problems such as high power cost and increased maintenance cost.

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.

Korean Patent Publication No. 10-2011-0075732 (Jul. 2011)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a material panel, To reduce the size of the electric furnace by reducing the size of the electric furnace and to reduce the operation time of the electric furnace by reducing the power cost and the maintenance cost And to provide a preheating apparatus for hot stamping molding.

In order to accomplish the above object, a preheating apparatus for hot stamping molding according to an embodiment of the present invention is disposed in front of an electric heating furnace which supplies material from a material supply device to a molding apparatus by heating the material panel to a high temperature state, A pair of mounting plates for preheating the material panel to a predetermined temperature before being charged into the electric heating furnace, the rear ends of which are respectively mounted on both front sides of the electric heating furnace; A plurality of conveyor rollers installed along the longitudinal direction between the respective mounting plates and moving the material panel supplied from the material feeder to the electric heating furnace; At least one support roller installed at a predetermined distance in the front-rear direction below the front end of the mounting plate and in rolling contact with the lower surface of the material panel; At least one first electrode roller provided on the front end of the mounting plate corresponding to the supporting roller and in rolling contact with an upper surface of the material panel; And at least one second electrode roller installed on the mounting plate at a position spaced rearward from the first electrode roller corresponding to the supporting roller and rolling on the upper surface of the material panel.

The first electrode rollers may be arranged as a pair and may be spaced apart from each other by a predetermined distance on both sides in the width direction between the respective mounting plates.

The first electrode roller may be rotatably mounted to the mounting plate through a first roller shaft.

The first roller shaft may be mounted so as to be movable and rotatable up or down on a first slot, both ends of which are vertically formed on one side of the front upper portion of the mounting frame.

The second electrode rollers may be formed as a pair and may be spaced apart from each other by a predetermined distance on both sides in the width direction between the mounting plates.

The second electrode roller may be rotatably mounted on the mounting plate through a second roller shaft.

The second roller shaft may be mounted to be movable and rotatable upward or downward on a second slot, both ends of which are vertically formed on one side of a central upper portion of the mounting frame.

The first electrode roller and the second electrode roller are electrically connected to a power supply, respectively, and can supply a current supplied from the power supply to the material panel in a state of being in contact with the material panel.

The second electrode roller may be supplied from the power supply to the first electrode roller to return a current through the material panel to the power supply.

The support roller is disposed between the conveyor rollers at a position corresponding to the first electrode roller and the second electrode roller and can be rotatably mounted to the mounting plate through a rotating shaft.

As described above, according to the preheating apparatus for hot stamping molding according to the embodiment of the present invention, the material panel put in front of the electric heating furnace is quickly heated by resistance heat by energization before forming the material panel formed of the boron steel sheet, It is possible to reduce the total size of the electric heating furnace by reducing the equipment cost by putting the furnace in the electric heating furnace in a preheated state to a temperature higher than the temperature.

In addition, since the electric heating furnace is activated only when the first preheated material panel is inserted through the preheating device, the electric heating furnace is prevented from being continuously operated, thereby reducing the power cost and the maintenance cost.

Further, by applying the pair of the first and second electrode rollers to which the current is supplied and returned, rapid warm-up is possible simultaneously during conveyance of the two material panels to shorten the preheating time, The occurrence of the phenomenon can be prevented in advance, and the entire cycle time can be shortened by shortening the heating time of the material panel.

In addition, by applying the pair of first and second electrode rollers to which current is supplied and returned, it is possible to rapidly preheat simultaneously at the time of inputting two sheets of material panels, shortening the preheating time, It is possible to prevent the coating layer from being formed in the material panel by preheating the material rapidly by using the heat and to shorten the heating time of the material panel and to improve the productivity by reducing the whole cycle time.

In addition, the installation area of the electric heating furnace is reduced to improve the space utilization in the workplace.

1 is a hot stamping process diagram to which a preheating device for hot stamping according to an embodiment of the present invention is applied.
2 is a perspective view of a preheating device for hot stamping according to an embodiment of the present invention.
3 is an enlarged view of a portion A in Fig.
4 is a step-by-step operation diagram of a preheating apparatus for hot stamping according to an embodiment of the present invention.

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

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that various equivalents and modifications may be present.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

And throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", " unit of means ", " part of item ", " absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

2 is a perspective view of a preheating apparatus for hot stamping according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2 .

The preheating device 100 for hot stamping according to the embodiment of the present invention is a device for heating the material P fed from the material feeder 10 to the front of the electric heating furnace 20, A conveyor roller 120, a support roller 130, a first electrode roller 140, and a second electrode roller 140. The first electrode roller 140 and the second electrode roller 140 are disposed on the first electrode roller 140 to preheat the workpiece P to a predetermined temperature before the electric heater 20 is inserted. ), And a second electrode roller (150).

First, the mounting plates 110 are formed as a pair, and the rear ends are mounted on both sides of the front side of the electric heating furnace 20.

The mounting plate 110, which is installed along the longitudinal direction between the mounting plates 110 and mounted on both sides of the front of the electric heating furnace 20, includes a plurality of conveyor rollers 120, .

The conveyor roller 120 moves the material panel supplied from the material feeder 10 to the electric heating furnace 20.

In this embodiment, the support roller 130 is installed at a predetermined distance in the front-rear direction below the front end of the mounting plate 110, and is in rolling contact with the lower surface of the material panel P.

Two support rollers 130 are provided at the front end of the mounting plate 110 and two spaced apart from each other in the width direction between the mounting plates 110 at a position spaced one time before from the front to the rear, And a pair of the first electrode roller 140 and the second electrode roller 150, respectively.

Here, the support roller 130 is located at the same height as the conveyor roller 120 and can be rotatably mounted on the mounting plate 110 through the rotation shaft 131.

The support roller 130 may be disposed between the conveyor rollers 120 at a position corresponding to the first electrode roller 140 and the second electrode roller 150.

Accordingly, the support roller 130 rotates in a state of rolling contact with the lower surface of the workpiece panel P together with the conveyor roller 120, thereby moving the workpiece panel P smoothly.

The first electrode roller 140 may include at least one of the first electrode rollers 140 and the second electrode roller 140. The first electrode roller 140 may be disposed above the front end of the mounting plate 110 corresponding to the support roller 130, The upper surface is in rolling contact with the upper surface.

Here, the first electrode rollers 140 are formed as a pair and are spaced apart from each other by a predetermined distance on both sides in the width direction between the mounting plates 110, And may be rotatably mounted on the plate 110. [

In this embodiment, the first roller shaft 141 is movably and rotatably mounted on the first slot 111 on both sides of the front upper part of the mounting frame 110, .

That is, the first electrode roller 140 moves up or down the first roller shaft 141 on the first slot 111 according to the thickness difference of the material panel P fed from the material feeder 10, So that the height difference of the panel P can be compensated and the upper surface of the material panel P can be brought into smooth rolling contact.

The second electrode roller 150 may be installed on the mounting plate 110 at a position spaced rearward from the first electrode roller 140 corresponding to the support roller 130, , And is in rolling contact with the upper surface of the material panel (P).

Here, the second electrode rollers 150 are formed as a pair and are spaced apart from each other by a predetermined distance on both sides in the width direction between the respective mounting plates 110, and the second electrode rollers 150 are mounted through the second roller shaft 151 Can be mounted rotatably on the plate (110).

In the present embodiment, the second roller shaft 151 is movably and rotatably mounted on the second slot 113 on either side of the central upper portion of the mounting frame 110, .

That is, the second electrode roller 150 moves up or down the second roller shaft 151 on the second slot 111 according to the thickness difference of the material panel P fed from the material feeder 10, So that the height difference of the panel P can be compensated and the upper surface of the material panel P can be brought into smooth rolling contact.

Meanwhile, the first and second electrode rollers 140 and 150 are formed as a pair on both sides of the mounting plates 110, which are spaced apart from each other in the width direction. Thus, when two material panels P are supplied together The respective material panels P can be preheated simultaneously.

The first electrode roller 140 and the second electrode roller 150 constituted as described above are grouped into two, and the support roller 130, which is formed by a pair of the front and rear ends of the front end of the mounting plate 110, At the same position as that of the support roller 110.

The first electrode roller 140 and the second electrode roller 150 are electrically connected to the power supply 160, respectively.

The first electrode roller 140 and the second electrode roller 150 are connected to the first electrode roller 140 and the second electrode roller 150 while the material panel P is in contact with the first and second electrode rollers 140 and 150, The current supplied from the current source 160 is supplied to the material panel 150.

The first electrode roller 140 is supplied with current from a power supply 160 and the second electrode roller 150 is supplied from the power supply 160 to the first electrode roller 140, The current passing through the material panel P can be returned to the power supply 160 to circulate the current.

When the first electrode roller 140 and the second electrode roller 150 are brought into contact with the upper surface of the material panel P together, the electric current supplied from the power supply 160 to the first electrode roller 140 becomes the second The resistance heat generated when electric current is supplied to the material panel P during the process of returning to the power supply unit 160 through the electrode roller 150 quickly preheats the material panel P.

Here, the support rollers 130 are disposed between the first electrode roller 140 and the second electrode roller 150 with the material panel P sandwiched therebetween, and between the first electrode roller 140 and the second electrode roller 150, The electrode rollers 150 can be stably supported, and the material panel P can be moved together with the conveyor rollers 120.

The material panel P is continuously moved toward the electric heating furnace 20 through each of the conveyor rollers 120 so that the first electrode roller 140 and the second electrode roller 140, The second electrode roller 150 is energized and can be preheated more quickly.

That is, the preheating device 100 according to the present embodiment rapidly preheats the material panel P being moved by the resistance heat generated when current is supplied by using the first and second electrode rollers 140 and 150, It is possible to prevent the surface coating layer from being burnt, which may occur on the surface of the material panel P formed of the boron steel sheet.

Hereinafter, the operation and operation of the hot-stamping preheater 100 according to the embodiment of the present invention will be described in detail.

4 is a step-by-step operation diagram of a preheating apparatus for hot stamping according to an embodiment of the present invention.

First, when the material panel P supplied from the material supply unit 10 is inserted into the front of the mounting plate 110 and contacts the first electrode roller 140 as shown in S1 of FIG. 4, The current supplied from the feeder 160 is not energized.

In this state, when each of the conveyor rollers 120 is operated to move the material panel P toward the electric heating furnace 20, as shown in (S2) of FIG. 4, The upper surface of the first electrode roller 140 and the surface of the second electrode roller 150 are in contact with each other.

At this time, the power supply 160 is turned on to supply the current to the first electrode roller 140, and the supplied current passes through the material panel P, And returned to the feeder 160.

Here, the material panel P is moved to the electric heating furnace 20 by the conveyor rollers 120 while the material panel P is rapidly preheated due to resistance heat generated by current flow.

When the material panel P in the preheated state is continuously moved toward the electric heating furnace 20, the contact between the material panel P and the first electrode roller 140 Is released.

Then, the power supply 160 is turned off to stop the supply of the current supplied to the first electrode roller 140, and the material panel P is moved in the preheated state by the conveyor rollers 120 And is introduced into the electric heating furnace 20.

Therefore, when the preheating device 100 for hot stamping according to the embodiment of the present invention as described above is applied, it is possible to prevent the material panel P made of the boron steel sheet from being fed in front of the electric heating furnace 20 The material panel P is rapidly heated by the resistance heat by the energization and is put into the electric heating furnace 20 in a state of being preheated to a predetermined temperature or more to reduce the total size of the electric heating furnace 20, can do.

It is also possible to prevent the electric heating furnace 20 from being continuously operated by allowing the electric heating furnace 20 to operate only when the material panel P is preheated through the preheating device 100, And conservation costs can be reduced.

Also, by applying the pair of the first and second electrode rollers 140 and 150 to which the current is supplied and returned, rapid preheating can be simultaneously performed even when the two material panels P are put in, and the preheating time can be shortened .

In addition, it is possible to prevent the coating layer from being burnt on the surface of the workpiece panel P by quickly preheating the moving workpiece panel P using the resistance heat by energization, The total cycle time can be reduced and the productivity can be improved.

In addition, the installation area of the electric heating furnace 20 can be reduced to improve space utilization in the workplace.

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 exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Preheating device
110: mounting plate
111: 1st slot
113: second slot
120: Conveyor roller
130: Support roller
131: rotating shaft
140: first electrode roller
141: first roller shaft
150: second electrode roller
151: second roller shaft
160: Power supply
P: Material panel

Claims (10)

The material panel being disposed in front of an electric heating furnace for heating the material panel to be supplied from the material supply device to a high temperature state and supplying the material panel to the molding device and preheating the material panel to a predetermined temperature before the electric heating furnace is introduced,
A pair of mounting plates each having a rear end mounted on both front sides of the electric heating furnace;
A plurality of conveyor rollers installed along the longitudinal direction between the respective mounting plates and moving the material panel supplied from the material feeder to the electric heating furnace;
At least one support roller installed at a predetermined distance in the front-rear direction below the front end of the mounting plate and in rolling contact with the lower surface of the material panel;
At least one first electrode roller provided on the front end of the mounting plate corresponding to the supporting roller and in rolling contact with an upper surface of the material panel; And
And at least one second electrode roller installed on the mounting plate at a position spaced rearward from the first electrode roller corresponding to the supporting roller and rolling on an upper surface of the material panel,
Wherein the first electrode roller is rotatably mounted on the mounting plate through a first roller shaft,
The first roller shaft is moved upward or downward so as to smoothly contact the upper surface of the work panel by compensating a height difference of the work panel on a first slot where both ends are formed on one side of the front upper portion of the mounting frame in a vertical direction, And a rotatably mounted,
The second electrode roller being rotatably mounted on the mounting plate via a second roller shaft,
The second roller shaft is moved upward or downward to smoothly contact the upper surface of the work panel by compensating a height difference of the work panel on a second slot where both ends are vertically formed on one side of a central upper portion of the mounting frame And a rotatably mounted,
Wherein the first electrode roller and the second electrode roller are electrically connected to a power supply, respectively, and energize the current supplied from the power supply to the material panel in a state of being in contact with the material panel,
And the second electrode roller is supplied from the power supply to the first electrode roller to return the current passed through the material panel to the power supply. The method according to claim 1,
The first electrode roller
Wherein the first and second mounting plates are spaced from each other by a predetermined distance on both sides in the width direction between the mounting plates. delete delete The method according to claim 1,
The second electrode roller
Wherein the first and second mounting plates are spaced from each other by a predetermined distance on both sides in the width direction between the mounting plates. delete delete delete delete The method according to claim 1,
The support roller
Wherein the first electrode roller and the second electrode roller are disposed between the conveyor rollers at positions corresponding to the first electrode roller and the second electrode roller, and are rotatably mounted on the mounting plate through a rotating shaft.
KR1020140174335A 2014-12-05 2014-12-05 Pre-heating devise for hot stamping KR101632895B1 (en)

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CN113351767B (en) * 2021-07-13 2023-08-11 杭州同瑞机械制造有限公司 High-strength aluminum alloy hot stamping equipment and working method thereof
CN115026725A (en) * 2022-06-23 2022-09-09 中车长江运输设备集团有限公司 Preheating device for plate precoating, plate pretreatment line and pretreatment method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100364848B1 (en) 2002-07-20 2002-12-16 유병섭 A feeder of heat treatment system for profile bar
JP2012236198A (en) * 2011-05-10 2012-12-06 Waitekku:Kk Machining device

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Publication number Priority date Publication date Assignee Title
JPH05154503A (en) * 1991-11-30 1993-06-22 Aichi Steel Works Ltd Manufacture of small size stainless shape steel
KR101164323B1 (en) 2009-12-28 2012-07-09 현대하이스코 주식회사 Hot press device for different strength in a product and manufacturing method using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100364848B1 (en) 2002-07-20 2002-12-16 유병섭 A feeder of heat treatment system for profile bar
JP2012236198A (en) * 2011-05-10 2012-12-06 Waitekku:Kk Machining device

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