EP3924116A1 - Method and system for using air gaps in hot-stamping tools to form tailor tempered properties - Google Patents
Method and system for using air gaps in hot-stamping tools to form tailor tempered propertiesInfo
- Publication number
- EP3924116A1 EP3924116A1 EP20756349.5A EP20756349A EP3924116A1 EP 3924116 A1 EP3924116 A1 EP 3924116A1 EP 20756349 A EP20756349 A EP 20756349A EP 3924116 A1 EP3924116 A1 EP 3924116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot
- heated portion
- stamped product
- heat treating
- heated
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- C21D1/34—Methods of heating
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
-
- 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
- Various embodiments relate generally to a hot forming system and method for producing vehicle parts.
- One process used to form vehicle body parts is a hot-forming method in which heated blanks of steel are hot-stamped and quenched (for rapid cooling and hardening) in a hot forming die.
- a pre-heated sheet stock may be typically introduced into a hot forming die, formed to a desired shape and quenched subsequent to the forming operation while in the die to thereby produce a heat treated product.
- the known hot forming dies for performing the stamping and quenching steps typically employ water cooling passages (for circulating cooling water through the hot forming die) that are formed in a conventional manner. In some applications, it may be desirable to cool certain portions of the stamped metal at a slower rate than other portions.
- Such portions of the stamped part are heated by the stamping die so that the rate of cooling is slowed relative to the portions of the part that are exposed to portions of the die that receive cooling fluid.
- the more slowly cooled portions of the part will remain softer (more ductile) than the portions of the part subject to rapid cooling (quenching).
- cartridge heaters can be provided within a form block of the die so that heat is applied to areas of a product being stamped.
- One or more non-limiting embodiments provide a hot-stamping apparatus and hot stamping method through which a sheet metal blank is hot-stamped between first and second tool surfaces of first and second die tools, respectively, to form a hot-stamped product. That hot-stamped product is then heat treated between the first and second tool surfaces. An actively cooled portion of the tool surfaces quenches part of the hot-stamped product to form a hardened zone. An actively heated portion of the tool surfaces slows heat transfer from the hot-stamped product to the heated portion, which causes the hot-stamped product to have a soft zone. A matrix of insulating gaps is formed in the heated portion to further slow the rate of heat transfer from the hot-stamped product to the heated portion. The insulating gaps may facilitate the use of a lower-temperature heated portion, which may consequently save energy and result in the heated portion having greater wear resistance and longer life.
- All closed-ended (e.g., between A and B) and open-ended (greater than C) ranges of values disclosed herein explicitly include all ranges that fall within or nest within such ranges.
- a disclosed range of 1-10 is understood as also disclosing, among other ranges, 2-10, 1-9, 3-9, etc.
- the embodiments disclosed herein explicitly include embodiments that combine any value within the disclosed range of one parameter (e.g., parameter C) with any value within the disclosed range of any other parameter (e.g., parameter D).
- FIG. l is a perspective view of a lower die of a hot stamping system
- FIG. 2 is a perspective view of a hot-stamped product manufactured by the hot stamping system in FIG. 1;
- FIG. 3 is a perspective view of a heated portion of the lower die in FIG. 1;
- FIG. 4 is a top view of the heated portion shown in FIG. 3;
- FIG. 5 is an enlarged top view of the portion 5-5 in FIG. 4;
- FIG. 6 is a cross-sectional view of the heated portion of the lower die in FIG. 5, taken along the line 6-6 in FIG. 5;
- FIG. 7 is a cross-sectional view of the heated portion of the hot stamping system in FIG. 1;
- FIG. 8 is an enlarged cross-sectional view of the portion 8-8 shown in FIG. 7;
- FIG. 9 is a further enlarged cross-sectional view of FIG. 8.
- This disclosure relates to a hot-stamping system 10 and method for producing a hot-stamped product 20 with tailored properties.
- Such hot-stamped products 20 may include a vehicle body member or panel, or a pillar of an automobile.
- Forming“tailored” properties of products or parts using the system 10 and method herein described provides shaped parts that have regions of high strength and hardness as well as other regions of reduced strength, ductility, and hardness.
- the resulting vehicle structure has a complex configuration that includes regions that are engineered to deform in a predetermined manner upon receiving a force resulting from a vehicular crash, for example.
- the system 10 comprises upper and lower dies 30, 40 having upper and lower die tool surfaces 30a, 40a, respectively.
- FIG. 1 illustrates the lower die 30 and lower tool surface 30a.
- the upper and lower dies 30, 40 are shaped and configured to mate with each other to form a die cavity therebetween.
- the dies 30, 40 receive therebetween and hot stamp a workpiece/metal blank (e.g., a piece of hot sheet metal, e.g., steel such as press hardened steel (PHS), boron steel, with or without coatings (e.g., aluminum coating)).
- a workpiece/metal blank e.g., a piece of hot sheet metal, e.g., steel such as press hardened steel (PHS), boron steel, with or without coatings (e.g., aluminum coating)
- the lower tool surface 30a is divided into heated and cooled portions 50a, 60a.
- the cooled portions 60a and heated portion 50a may be formed by discrete die portions 60, 50, respectively, of the lower die 30 that fit together to define the overall die 30.
- FIGS. 3 and 4 illustrate the heated lower die portion 50 that defines the heated portion 50a of the lower tool surface 50a.
- the heated die portion 50 of the lower die 30 (as well as the corresponding heated upper die portion shown in FIG. 7) includes one or more heaters 70 that are positioned and configured to heat the heated tool surface portion 50a.
- the heater 70 comprise cartridge heaters, but could alternatively comprise any other type of suitable heater (e.g., passages through which heated fluid passes).
- the cooled die portions 60 of the lower die 30 (as well as the corresponding cooled upper die portions of the upper die 40) include one or more coolers (e.g., coolant passages through which an actively cooled (e.g., via a refrigeration system) coolant flows).
- the upper and lower dies surfaces 30a, 40a in the heated portion 50a of the dies 30, 40 are both heated.
- only the upper die 40 or only the lower die 30 could be heated.
- the upper and lower tool surfaces 60a in the cooled portions 60 of the dies 30, 40 are both cooled.
- only the upper die 40 or only the lower die 30 could be cooled.
- the dies 30, 40 form one continuous cooled portion and one continuous heated portion.
- additional and/or fewer heated and/or cooled portions may be provided to accommodate the particular hardness and ductility requirements of any desired product (e.g., alternating hard and soft portions of a work piece to provide an accordion crumple zone; a plurality of soft portions surrounded by a large hardened portion, etc.).
- a matrix 90 of insulating gaps 100 is formed in the heated surface portions 50a of the tool surfaces 30a, 40a of the upper and lower dies 30, 40.
- the matrix 90 divides the heated surface portion 50a into (1) a non-contact surface area formed by the insulating gaps 100, and (2) a contact surface area 110 where the gaps 100 are not disposed.
- the contact area 110 is shaped and configured to contact the blank during hot forming and contact the resulting hot-stamped product during heat treating.
- the non-contact area formed by the gaps 100 is shaped and configured to not contact the blank during hot forming and not contact the hot-stamped product during heat treating.
- the area of any surface is its actual surface area.
- the depth and shape of the depressions that form the gaps 100 will slightly impact the area of the gaps 100.
- the gaps 100 create depressions relative to the contact area 110 surrounding the gaps 100.
- the gaps 100 have a maximum depth d relative to the surface of the contact area 110.
- the maximum depth d of at least a D number of the air gaps 100 is (a) at least 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and/or 5.0 mm, (b) less than 20, 15, 10, 7.5, 5.0, 4.5, 4.0, 3.5, 3.0, 2.5, 2.0, 1.5, 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, and/or 0.2 mm, and/or (c) between any two such upper and lower values (e.g., between 0.01 and 20 mm, between 0.05 and 1.0 mm, between 0.1 and 0.5 mm, etc.).
- any two such upper and lower values e.g., between 0.01 and 20 mm, between 0.05 and 1.0
- the depth d is about 0.25 mm for at least 10 of the gaps 100.
- D is (a) at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, and/or 100, (b) less than 1000, 500, 400, 300, 200, 150, 100, 90, 80, 70, 60, 50, 40, 35, 30, 25, 20, 15, 10, 9, 8, 7, and/or 6, and/or (c) between any two such values (e.g., between 2 and 1000, between 5 and 500, etc.).
- the depths d of different air gaps 100 may differ, even within a single embodiment.
- gaps 100 each have an area a as viewed in a direction perpendicular to the contact area 110 surrounding the gap 100.
- the area a of an A number of the gaps 100 is (a) at least 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1500, 2000, 2500, 3000, 3500, 4000, 5000, 7500, and/or 10000 mm 2 , (b) less than 10000, 7500, 5000, 4000, 3000, 2500, 2000, 1500, 1250, 1000, 900, 800, 700, 600, 500, 400, 300, 200, 100, 90, 80, 70, 60, 50, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, and/or 6 mm 2 , and/or (c) between any two such upper and lower values
- A is (a) at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, and/or 100, (b) less than 1000, 500, 400, 300, 200, 150, 100, 90, 80, 70, 60, 50, 40, 35, 30, 25, 20, 15, 10, 9, 8, 7, and/or 6, and/or (c) between any two such values (e.g., between 2 and 1000, between 5 and 500, etc.).
- the area a of an A number of the gaps 100 is generally rectangular, with the rectangular gaps 100 arranged in a rectilinear grid of gaps 100.
- the gaps 100 may comprise 20 mm x 20 mm squares on a 25 mm pitch, which results in 5 mm wide contact surfaces 110 separating adjacent gaps 100.
- others of the gaps 100 have an area formed by different shapes.
- an area a of an A number of the gaps 100 may have any other suitable shape (e.g., triangles or hexagons) and be laid out in any suitable matrix (e.g., a hexagonal or triangular grid, a matrix of mixed polygonal gaps 100, a matrix of irregular gaps 100 having a variety of different shapes and areas).
- any suitable shape e.g., triangles or hexagons
- any suitable matrix e.g., a hexagonal or triangular grid, a matrix of mixed polygonal gaps 100, a matrix of irregular gaps 100 having a variety of different shapes and areas.
- a shape and size of the gap(s) 100 and contact surface(s) 110 is chosen so as to the contact surface(s) 110 are sufficiently spread out over the heated portion 50a that they support the blank during said hot-stamping and substantially prevent the blank from moving into the volume of the air gap(s) 100 during the hot-stamping.
- overlaying a circle with a diameter c onto anywhere within the heated portion 50a results in the circle overlaying at least a portion of the contact surface(s) 110.
- the diameter c is (a) less than 10000, 7500, 5000, 4000, 3000, 2000, 1000, 900, 800, 700, 600, 500, 400, 300, 250, 200, 150, 100, 90, 80, 70, 60, 50, 40, 30, 20, and/or 10 mm and (b) greater than 0, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, and/or 100 mm.
- the cumulative contact surface 110 area within the heated portion 50 may comprise at least (a) 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80 % of the area of the heated portion 50, (b) less than 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80 % of the area of the heated portion 50, and/or (c) between any two such upper and lower values (e.g., between 25 and 80 %, between 26 and 50 %, etc.).
- the contact surface comprises about 36% of an area of the heated portion 50.
- a surface area of the heated portion 50a (including both the contact surface area 110 and a surface area of the gaps 100) is (1) at least 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1500, 2000, 2500, 3000, 4000, 5000, 7500, 10000, 15000, 20000, 30000, 40000, 50000, 75000, and/or 100000 mm 2 , (2) less than 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1500, 2000, 2500, 3000, 4000, 5000, 7500, 10000, 15000, 20000, 40000, 50000, 60000, 75000 mm 2 , and/or (3) between any two such upper and lower values (e.g., between 100 and 100000 mm 2 , between 200 and 20000 mm 2 ).
- the surface area of the heated portion 50a is the same as the and surface area of the corresponding soft zone 20
- each air gap 100 is isolated from every other gap 100 by the contact surface 110. According to various embodiments, each gap 100 is completely surrounded by the contact surface 110. However, according to alternative embodiments, some or all of the gaps 100 may be interconnected (e.g., by a break in the contact surface 110 that separates two adjacent gaps 100). According to some embodiments, such interconnection may result in isolated islands of contact surface 110 surrounded completely by one or more gaps 100 (e.g., a matrix/grid of contact surfaces 110 separated by gaps 100, for example formed by reversing the relative positions of the gaps 100 and contacts surfaces 110 in FIG. 5).
- gaps 100 may be interconnected (e.g., by a break in the contact surface 110 that separates two adjacent gaps 100). According to some embodiments, such interconnection may result in isolated islands of contact surface 110 surrounded completely by one or more gaps 100 (e.g., a matrix/grid of contact surfaces 110 separated by gaps 100, for example formed by reversing the relative positions of the gaps 100 and contacts surfaces 110 in FIG. 5).
- the matrix extends over multiple gaps 100 in orthogonal directions.
- the matrix creates a rectilinear grid having x rows and y columns, where x and y are each at least 2.
- the gaps 100 each have a volume v.
- the volume v of a V number of the gaps 100 is (a) at least 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1500, 2000, 2500, 3000, 3500, 4000, 5000, 7500, 10000, 12500, 15000, 17500, and/or 20000 mm 3 , (b) less than 20000, 17500, 15000, 12500, 10000, 7500, 5000, 4000, 3000, 2500, 2000, 1500, 1250, 1000, 900, 800, 700, 600, 500, 400, 300, 200, 100, 90, 80, 70, 60, and/or 50 mm 3 , and/or (c) between any two such upper and lower values (e.g., between 20 and 20000 mm 3 , between 100 and 10000 mm 3 , etc.).
- V is (a) at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, and/or 100, (b) less than 1000, 500, 400, 300, 200, 150, 100, 90, 80, 70, 60, 50, 40, 35, 30, 25, 20, 15, 10, 9, 8, 7, and/or 6, and/or (c) between any two such values (e.g., between 2 and 1000, between 5 and 500, etc.).
- A, D, and V may be the same or different from each other.
- the gaps 100 may be formed by any suitable manufacturing method, including, without limitation, material removal methods (e.g., machining/drilling/abrading the gaps 100 into the surface of the dies), additive manufacturing (e.g., building up the contact surfaces adjacent to the gaps 100 (e.g., via 3D printing) to form the gaps 100), casting or forging the gaps 100 into the surface of the dies (e.g., at the same time as the contact surfaces are formed, or thereafter), etc.
- material removal methods e.g., machining/drilling/abrading the gaps 100 into the surface of the dies
- additive manufacturing e.g., building up the contact surfaces adjacent to the gaps 100 (e.g., via 3D printing) to form the gaps 100
- casting or forging the gaps 100 into the surface of the dies e.g., at the same time as the contact surfaces are formed, or thereafter
- a mirror-image (or non mirror-image) matrix of gaps 100 may also be formed on the upper die 40, as shown in FIGS. 7-9.
- the corresponding portions of the upper die 40 may also be heated via heaters.
- portions of the upper die 40 that mate with the cooled portions 60 may also be cooled.
- the matrix of insulating gaps 100 are shaped and configured to create a clearance between the hot-stamped product 20 and the heated portions 50a in the area of each of the insulating gaps 100 during the hot-stamping and heat-treating.
- the gaps 100 may be filled with air or another insulator (e.g., ceramic with a low heat conductivity). Consequently, the gaps 100 slow heat transfer from the hot-stamped product 20 to the heated portion 50a.
- the cooled portion 60 causes heat to quickly flow from the corresponding zone 20b of the product 20 to the cooled portion 60 during the heat-treating, which results in quenching and the formation of a hardened zone 20b (shown in FIG. 2) in the product 20.
- the temperature of the heated portion 50 is still lower than the temperature of the blank/product 20 when the hot-stamping process begins, which causes heat to flow from the product 20 to the heated portion 50 during the hot- stamping and, to a greater extent, during heat-treating.
- the heating of the heated portion 50 causes heat to transfer more slowly from the hot-stamped product 20 to the heated portion 50.
- the insulating gaps 100 slow the transfer of heat from the hot- stamped product 20 to the heated portion 50 via the gaps 100.
- Heating the heated portion 50 and providing the matrix of insulating gaps 100 causes a corresponding zone 20a of the hot- stamped product 20 that is pressed between the heated portions 50 of the die to be cooled relatively slowly, which results in a soft zone 20a of the hot-stamped product 20 that is relatively softer and more ductile than the hardened zone 20b of the product 20 and contains less martensite than the hardened zone 20b.
- the rate of heat transfer from the hot-stamped product 20 to the heated portion 50 is a function of the temperature gradient between the two. Heating the heated portion 50 reduces the temperature gradient, which slows heat transfer and results in a softer, more ductile zone 20a in the product 20. However, increasing the temperature of the heated portion 50 to reduce that gradient can be expensive due to energy costs and can detrimentally increase wear on the dies 30, 40 because hotter tools wear more easily than lower temperature tools.
- the heat transfer rate from the hot-stamped product 20 to the heated portion 50 is also a function of the heat transfer coefficient of the gaps 100.
- the air gaps 100 provide insulation, which slows the transfer of heat from the hot-stamped product 20 to the heated portion 50. This slowing of the heat transfer rate facilitates the counterbalancing use of a larger temperature gradient between the hot-stamped product 20 and heated portion 50, while still providing a soft zone 20a. That larger temperature gradient means that the temperature of the heated portion 50 can be lower, which reduces energy cost and increases the working lifespan of the heated portions 50 of the dies 30, 40.
- the working lifespan of the heated portions 50a may be extended by at least 5000, 10000, 15000, and/or 20000 hot-stamping cycled between repair/resurfacing.
- a maximum temperature of one or more of the heated portions 50a of the tool surface is (a) at least 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 °C cooler than a red hardness temperature of the tool material that forms the heated portion 50a and/or 50, (b) less than 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300 °C cooler than a red hardness temperature of the tool material that forms the heated portion 50a or 50, and/or (c) between 1 and 300 °C cooler than a red hardness temperature of the tool material that forms the heated portions 50a and/or 50, between 5 and 150 °C cooler than a red hardness temperature of the tool material that forms the heated portions 50a and/or 50, and/or between 10 and
- keeping the heated portion 50a of the surface of the die 50 below (and preferably well below) its red hardness temperature will reduce wear and tear on the die portion 50, 50a.
- keeping the core of the heated portion 50 of the die below (and preferably well below) its red hardness temperature tends to reduce the thermal-expansion-caused deformation of the die (and resulting shape errors in the stamped part).
- the air gaps 100 slow the rate of cooling of the hot stamped product sufficiently that the a hardness throughout the resulting soft zone 20a of the heat treated product (i.e., upon completion of the heat treatment) is advantageously low, e.g., y, wherein y is (a) less than 400, 350, 300, 250, 240, 230, 220, 210, 200, and/or 190 Hv, (b) at least 100, 120, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 300, 350, and/or 400 Hv, and/or (c) between any two such values (e.g., between 100 and 400 Hv, between 140 and 300 Hv, between 150 and 250 Hv, between 180 and 220 Hv).
- the blank material and cooled portion 60 result in a hardened zone 20b with a hardness, h, wherein h is (a) greater than or equal to 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, and/or 700 Hv, (b) less than or equal to 700, 675, 650, 635, 600, 575, 550, 525, 500, 475, and/or about 450 Hv, and/or (c) between any two such upper and lower valued (e.g., between 225 and 600 Hv, between 250 and 550 Hv, between 350 and 600 Hv, between 400 and 550 Hv, etc.).
- h is (a) greater than or equal to 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625,
- the tool material that forms the heated portion 50a may comprise any suitable material: W360 steel, which has a red hardness of 580°C; S600 with a red hardness of 610°C, Revolma with a red hardness of 630°C.
- W360 steel which has a red hardness of 580°C
- S600 with a red hardness of 610°C Revolma with a red hardness of 630°C.
- Revolma with a red hardness of 630°C.
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962805232P | 2019-02-13 | 2019-02-13 | |
PCT/IB2020/050886 WO2020165693A1 (en) | 2019-02-13 | 2020-02-04 | Method and system for using air gaps in hot-stamping tools to form tailor tempered properties |
Publications (2)
Publication Number | Publication Date |
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EP3924116A1 true EP3924116A1 (en) | 2021-12-22 |
EP3924116A4 EP3924116A4 (en) | 2022-12-14 |
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ID=72044750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20756349.5A Pending EP3924116A4 (en) | 2019-02-13 | 2020-02-04 | Method and system for using air gaps in hot-stamping tools to form tailor tempered properties |
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Country | Link |
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US (1) | US20220105553A1 (en) |
EP (1) | EP3924116A4 (en) |
CN (1) | CN113423518A (en) |
WO (1) | WO2020165693A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005025026B3 (en) * | 2005-05-30 | 2006-10-19 | Thyssenkrupp Steel Ag | Production of metal components with adjacent zones of different characteristics comprises press-molding sheet metal using ram and female mold, surfaces of ram which contact sheet being heated and time of contact being controlled |
FR2927828B1 (en) | 2008-02-26 | 2011-02-18 | Thyssenkrupp Sofedit | METHOD OF FORMING FROM FLAN IN SOFT MATERIAL WITH DIFFERENTIAL COOLING |
US8567226B2 (en) * | 2008-10-06 | 2013-10-29 | GM Global Technology Operations LLC | Die for use in sheet metal forming processes |
DE102009003508B4 (en) * | 2009-02-19 | 2013-01-24 | Thyssenkrupp Steel Europe Ag | Process for producing a press-hardened metal component |
DE102010060207A1 (en) * | 2010-10-27 | 2012-05-03 | Mgf Magnesium Flachstahl Gmbh | Method and plant for producing a magnesium sheet component |
DE102011120725A1 (en) * | 2010-12-17 | 2012-06-21 | Volkswagen Ag | Device for hot forming and partial hardening of component, comprises hot forming tool, which has primary tool part with primary mold surface and secondary tool part with secondary mold surface |
CN104846274B (en) * | 2015-02-16 | 2017-07-28 | 重庆哈工易成形钢铁科技有限公司 | Hot press-formed use steel plate, hot press-formed technique and hot press-formed component |
ES2662404T3 (en) * | 2015-03-26 | 2018-04-06 | Weba Werkzeugbau Betriebs Gmbh | Procedure and device for manufacturing a partially tempered shaped part |
FR3065330B1 (en) * | 2017-04-13 | 2019-05-03 | Tyco Electronics France Sas | TOOL FOR WELDING AN ELECTRICAL CONDUCTOR WITH A CONNECTING DEVICE |
CN114703427A (en) * | 2018-04-28 | 2022-07-05 | 育材堂(苏州)材料科技有限公司 | Steel material for hot press forming, hot press forming process, and hot press formed member |
US11198167B2 (en) * | 2018-06-26 | 2021-12-14 | Ford Motor Company | Methods for die trimming hot stamped parts and parts formed therefrom |
-
2020
- 2020-02-04 EP EP20756349.5A patent/EP3924116A4/en active Pending
- 2020-02-04 WO PCT/IB2020/050886 patent/WO2020165693A1/en unknown
- 2020-02-04 CN CN202080013857.0A patent/CN113423518A/en active Pending
- 2020-02-04 US US17/428,761 patent/US20220105553A1/en active Pending
Also Published As
Publication number | Publication date |
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WO2020165693A1 (en) | 2020-08-20 |
CN113423518A (en) | 2021-09-21 |
US20220105553A1 (en) | 2022-04-07 |
EP3924116A4 (en) | 2022-12-14 |
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