US20210040574A1 - Method of production of steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding - Google Patents
Method of production of steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding Download PDFInfo
- Publication number
- US20210040574A1 US20210040574A1 US16/584,264 US201916584264A US2021040574A1 US 20210040574 A1 US20210040574 A1 US 20210040574A1 US 201916584264 A US201916584264 A US 201916584264A US 2021040574 A1 US2021040574 A1 US 2021040574A1
- Authority
- US
- United States
- Prior art keywords
- semi
- finished product
- spots
- temperature
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000011265 semifinished product Substances 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000003466 welding Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 24
- 239000002826 coolant Substances 0.000 claims description 9
- 229910000734 martensite Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 abstract description 6
- 238000003303 reheating Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- -1 i.e. Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/667—Quenching devices for spray 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D2221/00—Treating localised areas of an article
Definitions
- This invention relates to a method of producing steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding.
- Materials for manufacturing steel sheet semi-finished products may include high-strength MnB steels, which possess a martensitic microstructure after processing. Such materials may be useful in car body construction. These materials may be produced by press hardening, which is a method of hardening in a tool. Therefore, these materials may show good strength, but may also exhibit a relatively poor ability to undergo plastic deformation, which has highly adverse consequences in welded structures, namely spot-welded joints. The risk of the structure failing under external loading, arising for instance from a car collision, increases with strength. Fractures driven by low energy may occur in welds or in adjacent regions. This risk can be reduced by local annealing of the material in and/or adjacent to locations of welds.
- Patent Application Publication No. US20190226045A1 describes a composition and method of production of a sheet of ferritic steel by annealing.
- One or more embodiments of the present invention generally concern a method for producing steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding.
- the method involves heating a steel semi-finished product to a temperature at which complete transformation of ferritic-pearlitic structure to austenite occurs.
- the semi-finished product is cooled locally in spots for welding to a temperature close to the martensite finish (M f ), after which heat conducted from the surroundings causes the temperature in these spots to rise to a temperature, at which a hardening structure becomes tempered, while the semi-finished product is transferred to a tool, in which the sheet blank is formed into a drawn part which, at the same time, is hardened in the tool.
- the sheet semi-finished product is retrieved from the tool once the required temperature is reached.
- the method may involve heating a steel semi-finished product to a temperature within the range of 800° C. to 980° C., where the energy supplied for heating and austenitizing is used in part for tempering the hardened spots in locations of future welds.
- the method involves locally and intensively cooling a steel semi-finished product with a cooling medium in spots for welding for 1 to 10 seconds.
- This invention generally relates to a method for producing steel sheet semi-finished products with a locally modified structure. More particularly, a method for producing steel sheet semi-finished products is provided that involves press hardening with locally-modified structure in spots for welding, wherein a steel blank is heated to a temperature at which ferritic-pearlitic structure completely transforms to austenite.
- the steel semi-finished product is initially heated to a temperature within the range of 800° C. to 980° C. or 930° C. to 960° C.
- the semi-finished product is cooled locally, in spots to be welded, to a temperature close to the martensite finish temperature (M f ), i.e., only in the locations where welds are to be made.
- M f martensite finish temperature
- local cooling of the steel semi-finished product in spots to be welded takes between 1 and 10 seconds. Cooling may be performed during transfer to a tool.
- This method of cooling produces hardened spots in the semi-finished product, whereas the temperature of the remaining material is above the temperature of transformation to hardening structures, martensite and possibly bainite. Cooling is preferably affected by means of nozzles through which pressurized cooling medium is supplied to the spots to be cooled. A shroud guides the medium away from the cooled spot. The shroud also secures that a defined spot is cooled. The intensity of the process can be enhanced by providing cooling on both faces of the sheet blank.
- a contact-based cooling method may be used, which involves pressing cooled blocks against the semi-finished product surface. Cooling is ended after the spot reaches a temperature at which a hardening structure forms. Intensive cooling dissipates heat energy only from the area to which it is applied, i.e., the spot where a weld is to be made. Cooling also removes the transformation energy released during transformation of austenite to hardening structure.
- Heat conducted from the surroundings of the cooled spot reheats the material in the spot, which initiates annealing of its hardening structure. Since the temperature of the blank has decreased, the cooled spots cannot reaustenitize because the temperature in their surroundings is now below the Ara temperature (i.e., the temperature when the austenite begins to cool down to reverse to become ferrite again), and, therefore, the spots cannot be hardened again in the process.
- Ara temperature i.e., the temperature when the austenite begins to cool down to reverse to become ferrite again
- the heated blank is then placed into a tool and deep drawing is performed, at the end of which the semi-finished product rests against a mould which removes heat from the semi-finished product, thereby causing austenite to transform to martensite.
- the resulting temperature gradient causes some of this energy to enter the undercooled spot, where this energy contributes to tempering of fresh martensite, which gradually changes to tempered martensite or bainite, i.e., ferrite and carbides.
- the hardened press-formed part is removed from the mould and left to cool to room temperature in air.
- the press-formed part can be removed at a different temperature, such as room temperature or at higher temperatures, when worked in a heated tool.
- FIG. 1 shows a sheet semi-finished product being cooled in spots where welds are to be made
- FIG. 2 shows cooling provided on both faces of the sheet semi-finished product.
- Steel blank P made of a sheet stock of 22MnB steel of 1.5 mm thickness is placed into a continuous heating furnace. It passes through the furnace for five minutes and heats up to 950° C., at which the initial ferritic-pearlitic structure transforms to austenite. Once this heating austenitizing process ends, the semi-finished product P is pushed out from the furnace and is set, with the aid of guides and stops and after two seconds, in an exactly-defined position in the cavity of a cooling fixture. At the same time, it is approached by a cooling head fitted with cooling nozzles 1 . Over 2.5 seconds, the spots to be welded are cooled with water M pressurized at 6 bar.
- the cooling medium M is screened from the surroundings by a concentric shroud 2 whose diameter is 12 mm.
- the shroud 2 also guides the cooling medium M away from the spot being cooled.
- the semi-finished product P is transferred to a tool by means of a handling device. 5 to 7 seconds after the end of cooling, the tool shuts and shapes the sheet semi-finished product P by plastic deformation into a drawn part, which is hardened in the tool at the same time.
- the semi-finished product P is then removed from the tool and cooled to room temperature.
- the sheet semi-finished product P is removed from the furnace, placed directly in the guides of the tool, while a cooling head 1 is positioned between the top of the mould and the blank holder, and immediately after the sheet P is set inside the mould, the cooling head performs the above-described cooling by pressing annular cooling blocks against the surface of the semi-finished product.
- the cooling head is then withdrawn from the mould, and there is a 5 to 10 second pause followed by deep drawing and hardening in the tool.
- the semi-finished product P is retrieved from the tool.
- the semi-finished product P can be pushed out from the furnace and transferred by handling grippers into a tool.
- the grippers are fitted with the above-described nozzles, which cool the spots by supplying a cooling medium for 3 seconds in the course of the transfer.
- the spots are then reheated by heat entering from the surroundings by conduction.
- the semi-finished product is positioned inside the tool with the use of guides and stops, after which the sheet semi-finished product P is shaped by plastic deformation into a drawn part and is hardened in the tool.
- the semi-finished product P is then removed from the tool and cooled to room temperature.
- the grippers do not include nozzles but cooled copper blocks which, when the semi-finished product is gripped by the grippers, are pressed by the grippers against the spots in the semi-finished product and achieve the desired cooling by heat dissipation over 4 seconds. The process then proceeds in the same fashion as the previous case.
- the invention can find broad use in the production of high-strength steel semi-finished products by means of press hardening, where improvement of mechanical properties in regions adjacent to weld joints is required.
Abstract
Description
- This application claims the priority benefit of Czech Patent Application Serial No. PV 2019-513 entitled “Method of production of steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding,” filed Aug. 7, 2019, the entire disclosure of which is incorporated herein by reference.
- This invention relates to a method of producing steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding.
- Materials for manufacturing steel sheet semi-finished products may include high-strength MnB steels, which possess a martensitic microstructure after processing. Such materials may be useful in car body construction. These materials may be produced by press hardening, which is a method of hardening in a tool. Therefore, these materials may show good strength, but may also exhibit a relatively poor ability to undergo plastic deformation, which has highly adverse consequences in welded structures, namely spot-welded joints. The risk of the structure failing under external loading, arising for instance from a car collision, increases with strength. Fractures driven by low energy may occur in welds or in adjacent regions. This risk can be reduced by local annealing of the material in and/or adjacent to locations of welds. Annealing improves ductility and reduces strength values to some extent. The drawbacks to this procedure include longer production times and the energy needed for the local annealing operation. Referring to background art, Patent Application Publication No. US20190226045A1 describes a composition and method of production of a sheet of ferritic steel by annealing.
- One or more embodiments of the present invention generally concern a method for producing steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding. Generally, the method involves heating a steel semi-finished product to a temperature at which complete transformation of ferritic-pearlitic structure to austenite occurs. Afterwards, the semi-finished product is cooled locally in spots for welding to a temperature close to the martensite finish (Mf), after which heat conducted from the surroundings causes the temperature in these spots to rise to a temperature, at which a hardening structure becomes tempered, while the semi-finished product is transferred to a tool, in which the sheet blank is formed into a drawn part which, at the same time, is hardened in the tool. Subsequently, the sheet semi-finished product is retrieved from the tool once the required temperature is reached.
- Furthermore, in various embodiments, the method may involve heating a steel semi-finished product to a temperature within the range of 800° C. to 980° C., where the energy supplied for heating and austenitizing is used in part for tempering the hardened spots in locations of future welds.
- Furthermore, in various embodiments, the method involves locally and intensively cooling a steel semi-finished product with a cooling medium in spots for welding for 1 to 10 seconds.
- This invention generally relates to a method for producing steel sheet semi-finished products with a locally modified structure. More particularly, a method for producing steel sheet semi-finished products is provided that involves press hardening with locally-modified structure in spots for welding, wherein a steel blank is heated to a temperature at which ferritic-pearlitic structure completely transforms to austenite.
- In various embodiments, the steel semi-finished product is initially heated to a temperature within the range of 800° C. to 980° C. or 930° C. to 960° C.
- Subsequently, the semi-finished product is cooled locally, in spots to be welded, to a temperature close to the martensite finish temperature (Mf), i.e., only in the locations where welds are to be made. Generally, local cooling of the steel semi-finished product in spots to be welded takes between 1 and 10 seconds. Cooling may be performed during transfer to a tool.
- This method of cooling produces hardened spots in the semi-finished product, whereas the temperature of the remaining material is above the temperature of transformation to hardening structures, martensite and possibly bainite. Cooling is preferably affected by means of nozzles through which pressurized cooling medium is supplied to the spots to be cooled. A shroud guides the medium away from the cooled spot. The shroud also secures that a defined spot is cooled. The intensity of the process can be enhanced by providing cooling on both faces of the sheet blank. In alternative embodiments, a contact-based cooling method may be used, which involves pressing cooled blocks against the semi-finished product surface. Cooling is ended after the spot reaches a temperature at which a hardening structure forms. Intensive cooling dissipates heat energy only from the area to which it is applied, i.e., the spot where a weld is to be made. Cooling also removes the transformation energy released during transformation of austenite to hardening structure.
- Heat conducted from the surroundings of the cooled spot reheats the material in the spot, which initiates annealing of its hardening structure. Since the temperature of the blank has decreased, the cooled spots cannot reaustenitize because the temperature in their surroundings is now below the Ara temperature (i.e., the temperature when the austenite begins to cool down to reverse to become ferrite again), and, therefore, the spots cannot be hardened again in the process.
- The heated blank is then placed into a tool and deep drawing is performed, at the end of which the semi-finished product rests against a mould which removes heat from the semi-finished product, thereby causing austenite to transform to martensite. The resulting temperature gradient causes some of this energy to enter the undercooled spot, where this energy contributes to tempering of fresh martensite, which gradually changes to tempered martensite or bainite, i.e., ferrite and carbides.
- Having reached the martensite finish temperature, the hardened press-formed part is removed from the mould and left to cool to room temperature in air. In other embodiments, the press-formed part can be removed at a different temperature, such as room temperature or at higher temperatures, when worked in a heated tool.
-
FIG. 1 shows a sheet semi-finished product being cooled in spots where welds are to be made; and -
FIG. 2 shows cooling provided on both faces of the sheet semi-finished product. -
- 1 nozzle
- 2 shroud
- 3 sleeve
- P steel sheet to be processed
- M flow of cooling medium
- I. Supply of cooling medium
- II. Removal of cooling medium
- III. Region under cooling
- Steel blank P made of a sheet stock of 22MnB steel of 1.5 mm thickness is placed into a continuous heating furnace. It passes through the furnace for five minutes and heats up to 950° C., at which the initial ferritic-pearlitic structure transforms to austenite. Once this heating austenitizing process ends, the semi-finished product P is pushed out from the furnace and is set, with the aid of guides and stops and after two seconds, in an exactly-defined position in the cavity of a cooling fixture. At the same time, it is approached by a cooling head fitted with cooling nozzles 1. Over 2.5 seconds, the spots to be welded are cooled with water M pressurized at 6 bar. The cooling medium M is screened from the surroundings by a
concentric shroud 2 whose diameter is 12 mm. Theshroud 2 also guides the cooling medium M away from the spot being cooled. After the cooling ends, the semi-finished product P is transferred to a tool by means of a handling device. 5 to 7 seconds after the end of cooling, the tool shuts and shapes the sheet semi-finished product P by plastic deformation into a drawn part, which is hardened in the tool at the same time. The semi-finished product P is then removed from the tool and cooled to room temperature. - In another preferred embodiment, the sheet semi-finished product P is removed from the furnace, placed directly in the guides of the tool, while a cooling head 1 is positioned between the top of the mould and the blank holder, and immediately after the sheet P is set inside the mould, the cooling head performs the above-described cooling by pressing annular cooling blocks against the surface of the semi-finished product. The cooling head is then withdrawn from the mould, and there is a 5 to 10 second pause followed by deep drawing and hardening in the tool. When the tool temperature reaches room temperature, the semi-finished product P is retrieved from the tool.
- In another preferred embodiment, the semi-finished product P can be pushed out from the furnace and transferred by handling grippers into a tool. The grippers are fitted with the above-described nozzles, which cool the spots by supplying a cooling medium for 3 seconds in the course of the transfer. The spots are then reheated by heat entering from the surroundings by conduction. Within the next 5 seconds, the semi-finished product is positioned inside the tool with the use of guides and stops, after which the sheet semi-finished product P is shaped by plastic deformation into a drawn part and is hardened in the tool. The semi-finished product P is then removed from the tool and cooled to room temperature.
- In another preferred embodiment, the grippers do not include nozzles but cooled copper blocks which, when the semi-finished product is gripped by the grippers, are pressed by the grippers against the spots in the semi-finished product and achieve the desired cooling by heat dissipation over 4 seconds. The process then proceeds in the same fashion as the previous case.
- The invention can find broad use in the production of high-strength steel semi-finished products by means of press hardening, where improvement of mechanical properties in regions adjacent to weld joints is required.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CZ2019-513A CZ308209B6 (en) | 2019-08-07 | 2019-08-07 | Method of producing sheet steel semi-finished products by the press-hardening method with locally modified structure in places for weldsThe method of producing sheet steel blanks (P) by the press-hardening method with locally modified structure at the locations for welds is that the steel semi-product (P) is heated to a temperature at which the ferritic-peritic structure is fully transformed into austenite, then the semi-product (P) is cooled locally in the spots to be welded to a temperature close to Mf steel, followed by reheating by heat conduction from the environment and, consequently, annealing of the haze structure. Thereafter, the semi-product is transformed into a spatial extract in the tool, which is also turbid in the tool, and the sheet semi-product (P) is removed from the tool when the desired temperature is reached. |
CZPV2019-513 | 2019-08-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20210040574A1 true US20210040574A1 (en) | 2021-02-11 |
Family
ID=69583150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/584,264 Abandoned US20210040574A1 (en) | 2019-08-07 | 2019-09-26 | Method of production of steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding |
Country Status (2)
Country | Link |
---|---|
US (1) | US20210040574A1 (en) |
CZ (1) | CZ308209B6 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11904373B2 (en) | 2020-10-30 | 2024-02-20 | Zapadoceska Univerzita V Plzni | Modification of a deep-drawing sheet blank for electric resistance heating |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4795486B2 (en) * | 2009-06-22 | 2011-10-19 | 新日本製鐵株式会社 | Steel plate hot press forming method, steel plate hot press forming apparatus, and steel forming member |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ307654B6 (en) * | 2011-04-04 | 2019-01-30 | Západočeská Univerzita V Plzni | Process for producing steel stamping with locally modified properties |
DE102013002625B4 (en) * | 2013-02-15 | 2015-03-05 | Audi Ag | Gripper device for the transport of heated sheet metal blanks, as well as methods for producing hot-formed and / or press-hardened sheet-metal shaped parts |
CZ305697B6 (en) * | 2014-06-30 | 2016-02-10 | Západočeská Univerzita V Plzni | Process for producing hot drawn plate steel parts |
-
2019
- 2019-08-07 CZ CZ2019-513A patent/CZ308209B6/en not_active IP Right Cessation
- 2019-09-26 US US16/584,264 patent/US20210040574A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4795486B2 (en) * | 2009-06-22 | 2011-10-19 | 新日本製鐵株式会社 | Steel plate hot press forming method, steel plate hot press forming apparatus, and steel forming member |
Non-Patent Citations (1)
Title |
---|
JP 4795486 machine translation (Year: 2011) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11904373B2 (en) | 2020-10-30 | 2024-02-20 | Zapadoceska Univerzita V Plzni | Modification of a deep-drawing sheet blank for electric resistance heating |
Also Published As
Publication number | Publication date |
---|---|
CZ2019513A3 (en) | 2020-02-26 |
CZ308209B6 (en) | 2020-02-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8597441B2 (en) | Method for producing partially hardened steel components | |
KR101792176B1 (en) | Method and device for producing a metal component | |
CN101622365B (en) | Method for improving the performance of seam-welded joints using post-weld heat treatment | |
CN101805821B (en) | Integrated stamping forming treatment method of steel | |
US7618503B2 (en) | Method for improving the performance of seam-welded joints using post-weld heat treatment | |
US20110094282A1 (en) | Method and hot forming system for producing a hardened, hot formed workpiece | |
US20090320968A1 (en) | Differential heat shaping and hardening using infrared light | |
KR102048579B1 (en) | System and method for producing a hardened and tempered structural member | |
KR20140138074A (en) | System and method for hot-forming blanks | |
JP7160917B2 (en) | Pressing method for coated steel and use of steel | |
JP6940509B2 (en) | Heat treatment method and heat treatment equipment | |
JP2019508582A (en) | Method and apparatus for heat treating metal | |
JP7437466B2 (en) | Heat treatment method | |
KR20190039666A (en) | Centering and selective heating of blanks | |
CN111545626B (en) | Deep drawing punch forming process for automobile sheet metal part | |
US10294536B2 (en) | Cooling element with spacer | |
US20210040574A1 (en) | Method of production of steel sheet semi-finished products by press hardening with locally-modified structure in spots for welding | |
CN108884508A (en) | Heat treatment method and annealing device | |
KR101620735B1 (en) | Heating device and hot press forming method | |
US20210230711A1 (en) | Heat treatment method and heat treatment apparatus | |
CN111438327A (en) | Mechanical connection method and device for automobile steel | |
US10266905B2 (en) | Method and apparatus for hardening a component or semi-finished product | |
Li et al. | Effect of heating and mold temperature on the mechanical properties and microstructure of B1500HS boron steel | |
CN109070173B (en) | Method and device for producing hardened steel components | |
US11332800B2 (en) | Method and device for forming and hardening steel materials |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ZAPADOCESKA UNIVERZITA V PLZNI, CZECH REPUBLIC Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MASEK, BOHUSLAV;STADLER, CTIBOR;GEORGIEV, VJACESLAV;AND OTHERS;REEL/FRAME:050506/0133 Effective date: 20190815 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: ADVISORY ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |