KR20120048398A - Roller of hot press forming heating furnace having excellent mechanical properties and anti-reactivity with plated material - Google Patents

Roller of hot press forming heating furnace having excellent mechanical properties and anti-reactivity with plated material Download PDF

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Publication number
KR20120048398A
KR20120048398A KR1020100110011A KR20100110011A KR20120048398A KR 20120048398 A KR20120048398 A KR 20120048398A KR 1020100110011 A KR1020100110011 A KR 1020100110011A KR 20100110011 A KR20100110011 A KR 20100110011A KR 20120048398 A KR20120048398 A KR 20120048398A
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KR
South Korea
Prior art keywords
roller
coating layer
ceramic
hpf
mechanical properties
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KR1020100110011A
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Korean (ko)
Inventor
이규민
Original Assignee
주식회사 포스코
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Priority to KR1020100110011A priority Critical patent/KR20120048398A/en
Publication of KR20120048398A publication Critical patent/KR20120048398A/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
    • C23C4/16—Wires; Tubes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

PURPOSE: A roller of an HPF(Hot Press Forming) furnace with superior mechanical properties and reaction resistance to a plating material is provided to minimize the fusion or penetration of a plating material, reduce the costs for replacement of rollers, and improve the efficiency of an HPF process. CONSTITUTION: A roller of an HPF furnace comprises a metal base(1), a thermal spray coating layer(2) formed of ceramic coated on the outer surface of the metal base, and a surface coating layer(3) formed of smaller ceramic on the outer surface of the thermal spray coating layer. The metal base is the SCH22 or STS310S material. The ceramic of the thermal spray coating layer includes ZrO2. The ceramic of the surface coating layer includes BN.

Description

ROLLER OF HOT PRESS FORMING HEATING FURNACE HAVING EXCELLENT MECHANICAL PROPERTIES AND ANTI-REACTIVITY WITH PLATED MATERIAL}

The present invention relates to a roller of an HPF (Hot Press Forming) furnace having excellent mechanical properties and reaction resistance with a plating material. More specifically, the base metal of the roller of the HPF furnace is made of metal, and the ceramic is sprayed on the outer surface thereof. The present invention relates to a roller of an HPF furnace that can be coated to prevent breakage and damage of the roller.

Recently, as the importance of improving fuel economy and environmental improvement of automobiles is increasing, lightweighting of automobiles is emerging as a key task. Accordingly, the high strength of automotive steel sheet has become a very important problem, the general cold forming has a limit to produce a high-strength steel in accordance with the weight reduction of the automobile, the hot press molding method (HPF) has recently received a great spotlight. Hot press molding is a method of obtaining a super high strength product having a desired shape by reheating the material at a high temperature to sufficiently transform the austenite structure, and then molding and having the martensite structure through quenching.

However, since hot press molding requires a process of heating for a predetermined time in a high temperature heating furnace, many oxidation scales are generated on the surface of the material, which causes a problem of lowering product quality and lowering productivity. Therefore, in order to improve this, in most cases, hot press molding is performed on the plating material on which Al or Zn plating is performed on the surface of the material.

However, since Al and Zn both have melting points of about 660 ° C. or 450 ° C., which are much lower than the austenite transformation region, which is the heating temperature, the plating layer is often liquefied in the furnace before sufficient alloying with base iron is achieved. Occurs. Accordingly, the plating solution thus sintered or penetrated into the roller used as a material conveying means of the HPF heating furnace occurred. Most of the rollers of HPF furnaces used in the past are ceramic rollers. Since the ceramic material is porous with low chemical reactivity with Al or Zn, it is difficult to prevent sintering or penetration of molten Al or Zn, and also mechanical and thermal shock. There is a problem that the damage or breakage of the roller easily occurs because of poor properties.

In particular, in order to remove the molten Al or Zn sintered on the ceramic roller is usually grinding (Grinding), because the ceramic material is not very brittle, because of the impact generated during the polishing process will cause a fine crack inside the roller, Through the removal of the sintered layer, the life of the roller is shortened, which leads to an increase in the cost of replacing the roller and a reduction in the process efficiency, resulting in a problem of lowering the production efficiency of the high strength steel.

Therefore, in order to improve the efficiency of the HPF process to contribute to the weight reduction of automotive steel sheet, the development of a technology that can improve the mechanical properties of the roller of the HPF furnace and prevent the damage or breakage of the roller by reaction with the plating material has been developed. This is a very urgent point.

The present invention provides a roller of an HPF furnace that can improve the mechanical properties of the roller and improve the reaction resistance with the plating material in order to solve the problem that the ceramic roller of the conventional HPF furnace is easily damaged or broken. .

The present invention is a metal base material; And a spray coating layer coated with a ceramic on the outer surface of the metal base material, thereby providing a roller of an HPF furnace having excellent mechanical properties and resistance to plating with a plating material.

At this time, the metal base material is preferably SCH22 or STS310S material.

In addition, the ceramic of the thermal spray coating layer preferably comprises ZrO 2 .

At this time, it is more preferable that the outer surface of the thermal spray coating layer further comprises a surface coating layer coated with a ceramic having a smaller particle diameter than the ceramic of the thermal spray coating layer.

In addition, the ceramic of the surface coating layer preferably includes BN.

According to one aspect of the present invention, it is possible to improve the mechanical properties of the roller of the HPF furnace, to minimize the sintering or penetration of the steel plate plating material, thereby reducing the roller replacement cost, and improve the HPF process efficiency, It is possible to efficiently produce high strength steel sheet, which can greatly contribute to the development of the automotive industry.

Figure 1 (a) is a schematic diagram showing the process of transferring the steel sheet on the roller in the HPF heating furnace from the top surface, and (b) is a schematic diagram shown from the side.
Figure 2 is a schematic diagram showing the surface temperature of the steel sheet over time when the aluminum plated steel sheet is heated in the HPF furnace.
Figure 3 is a photograph showing an aluminum sintered layer formed on the outer surface of a conventional ceramic roller.
Figure 4 is a schematic diagram showing a cross section of the roller according to one side of the present invention.
Figure 5 (a) is a schematic diagram showing a cross-sectional view of the aluminum lump formed in the groove of the conventional ceramic roller surface, (b) is a schematic diagram showing a cross-sectional view of BN coated on the groove of the roller surface according to one aspect of the present invention. .

Figure 1 shows a process in which the steel sheet is transported on the roller in the HPF furnace, the present invention is to solve the problem relating to the damage or damage of the roller that may occur in the transfer process of such a plated steel sheet. That is, for example, in the case of Al-plated steel sheet is heated in the HPF heating furnace as shown in Figure 2 as the melting point of Al exceeds 660 ℃ over time, thereby fully Fe-Al alloying is achieved The phenomenon that Al melts before occurs.

Conventionally, ceramic was used as a material of the roller, and molten Al is sintered to the ceramic roller as shown in FIG. 3 in the process of transporting for press after finishing heating in the HPF heating furnace. At the same time, the horizontality of the roller is distorted. Therefore, when this distortion is intensified, the steel sheet may stop or meander by lowering the straightness of the steel sheet conveying, thereby causing a problem in that the conveying line of the HPF furnace is not normally operated.

In order to solve such a problem, conventionally, the aluminum sintered layer formed on the outer surface of the ceramic roller had to be polished and removed as shown in FIG. 3. However, since the ceramic material is weak in mechanical properties, particularly brittle, cracks occur due to the impact generated during the polishing process, which shortens the life of the rollers, which leads to frequent roller replacement and lower productivity of the HPF line. It would have been.

In addition, since the ceramic material has a porous property, the internal density is not good and molten Al easily penetrates into the ceramic roller, and thermal shock may be applied to the ceramic roller due to the difference in thermal expansion properties of the infiltrated Al and the ceramic material. Inevitably, it was difficult to avoid damage and breakage of the roller.

The present inventors are based on a metal base material; And by providing a roller of the HPF heating furnace characterized in that the ceramic coating coated on the outer surface of the metal base material, thereby improving the mechanical properties of the roller, damage to the roller due to the reaction with the plated material and The problem of breakage has been improved.

That is, the present inventors recognized that the mechanical properties were not good by using ceramic as the base material of the roller of the HPF furnace, and used metal as the base material of the roller. However, since the ceramic has excellent reaction resistance with a plating material such as Al or Zn, it is necessary to coat it on the outer surface of the metal base material. In this case, when the bonding strength between the ceramic coating layer and the metal base material is weak, a phenomenon may occur in which the coating layer is separated due to thermal shock due to a plating material. Thus, by spray coating, a strong bonding force is formed between the metal base material and the ceramic spray coating layer. It is important.

As such, when the roller of the HPF heating furnace is formed of a metal base material and a thermal spray coating layer formed on the outer surface thereof, the mechanical properties of the roller may be improved, and at the same time, the effect of the reaction with the plating material, which is an advantage of the conventional ceramic roller, may be generated. Accordingly, it is possible to significantly reduce the replacement cost of the roller, and thus, to maximize the efficiency of the HPF production line, it is possible to produce the HPF steel sheet more efficiently.

In this case, the metal base material is preferably a SCH22 or STS310S material exhibiting excellent heat resistance at a high temperature, and the ceramic of the thermal spray coating layer coated on the metal base material preferably contains ZrO 2 having excellent reaction resistance with a plated metal.

In addition, it is more preferable that the outer surface of the thermal spray coating layer further comprises a surface coating layer coated with a ceramic having a smaller particle size than that of the ceramic of the thermal spray coating layer. 4, the roller of the HPF furnace is a metal base material (1); A thermal spray coating layer (2) formed on an outer surface of the metal base material (1); And a surface coating layer 3 formed on an outer surface of the thermal spray coating layer 2, and the ceramics constituting the surface coating layer 3 should have a smaller particle diameter than the ceramics constituting the thermal spray coating layer 2. do.

Conventional ceramic rollers are formed with a large number of large and small grooves on the surface, as shown in Figure 5 (a), the molten aluminium during the transport flows to the roller while filling the grooves to the clogging ( Clogging) may occur, which may cause a problem of distorting the horizontality of the roller by forming the aluminum mass 4 on the surface of the roller.

Accordingly, the present invention forms a flat surface coating layer on the outer surface of the thermal spray coating layer by filling a groove of the thermal spray coating layer by coating a ceramic having a smaller particle diameter than that of the ceramic forming the thermal spray coating layer. Accordingly, it is possible to prevent the clogging phenomenon in advance to maintain the horizontal level of the roller. At this time, the ceramic of the surface coating layer may be effective to use the BN in consideration of economics and efficiency.

As described above, when the HPF furnace includes the roller, the operating cost of the entire furnace is greatly reduced, and the productivity can be improved.

1: metal base material 2: thermal spray coating layer
3: surface coating layer 4: aluminum lump

Claims (5)

Metal base material; And a thermal spray coating layer coated with a ceramic on an outer surface of the metal base material, and the roller of the HPF furnace having excellent mechanical properties and resistance to plating with a plating material.
The method according to claim 1,
The metal base material is SCH22 or STS310S material, characterized in that the roller of the HPF furnace with excellent mechanical properties and resistance to the plating material.
The method according to claim 1,
The ceramic of the thermal spray coating layer is ZrO 2 characterized in that the roller of the HPF furnace with excellent mechanical properties and resistance to plating material.
The method according to any one of claims 1 to 3,
The roller of the HPF heating furnace excellent in mechanical properties and resistance to the plating material, characterized in that it further comprises a surface coating layer coated with a ceramic having a smaller particle diameter than the ceramic of the thermal spray coating layer on the outer surface of the thermal spray coating layer.
The method of claim 4,
The roller of the HPF heating furnace excellent in mechanical properties and resistance to the plating material, characterized in that the ceramic of the surface coating layer comprises BN.
KR1020100110011A 2010-11-05 2010-11-05 Roller of hot press forming heating furnace having excellent mechanical properties and anti-reactivity with plated material KR20120048398A (en)

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KR1020100110011A KR20120048398A (en) 2010-11-05 2010-11-05 Roller of hot press forming heating furnace having excellent mechanical properties and anti-reactivity with plated material

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KR1020100110011A KR20120048398A (en) 2010-11-05 2010-11-05 Roller of hot press forming heating furnace having excellent mechanical properties and anti-reactivity with plated material

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101523177B1 (en) * 2014-12-11 2015-05-27 현대하이스코 주식회사 HOT STAMPING APPARATUS AND METHOD FOR PREVENTION OF STICKING Al PLATING
KR20160070913A (en) * 2014-12-10 2016-06-21 주식회사 포스코 Transfer apparatus having anti-meandering function and furnace for hot press forming including the same
KR20200102067A (en) 2019-02-21 2020-08-31 신효종 Work roll for tension leveler of metal foil rolling mill and manufacturing method therof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160070913A (en) * 2014-12-10 2016-06-21 주식회사 포스코 Transfer apparatus having anti-meandering function and furnace for hot press forming including the same
KR101523177B1 (en) * 2014-12-11 2015-05-27 현대하이스코 주식회사 HOT STAMPING APPARATUS AND METHOD FOR PREVENTION OF STICKING Al PLATING
WO2016093410A1 (en) * 2014-12-11 2016-06-16 현대제철 주식회사 Hot stamping apparatus and method for preventing plating from sticking to mold
CN108025343A (en) * 2014-12-11 2018-05-11 现代制铁株式会社 Coating is avoided to be bonded to the drop stamping apparatus and method of mould
CN108025343B (en) * 2014-12-11 2019-08-09 现代制铁株式会社 Coating is avoided to be bonded to the drop stamping device and method of mold
US10493514B2 (en) 2014-12-11 2019-12-03 Hyundai Steel Company Hot stamping apparatus and method for preventing plating from sticking to mold
KR20200102067A (en) 2019-02-21 2020-08-31 신효종 Work roll for tension leveler of metal foil rolling mill and manufacturing method therof

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