WO2009123538A1 - Method of manufacturing a press-formed sheet-metal product - Google Patents

Method of manufacturing a press-formed sheet-metal product Download PDF

Info

Publication number
WO2009123538A1
WO2009123538A1 PCT/SE2009/000177 SE2009000177W WO2009123538A1 WO 2009123538 A1 WO2009123538 A1 WO 2009123538A1 SE 2009000177 W SE2009000177 W SE 2009000177W WO 2009123538 A1 WO2009123538 A1 WO 2009123538A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal product
sheet
hardened
press
soft zone
Prior art date
Application number
PCT/SE2009/000177
Other languages
French (fr)
Inventor
Hans Bodin
Paul ÅKERSTRÖM
Original Assignee
Gestam Hardtech Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gestam Hardtech Ab filed Critical Gestam Hardtech Ab
Publication of WO2009123538A1 publication Critical patent/WO2009123538A1/en

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
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment

Definitions

  • This invention relates to a method of manufacturing a formed sheet-metal product according to the pre-characterising part of claim 1.
  • the invention also relates to a product manufactured by the method.
  • One aim of this invention is to provide a method allowing for the advantageous subsequent finishing of press-hardened products without compromising the form tolerances of the products.
  • One aim is to produce a soft edge zone with good tolerances while simultaneously reducing tool wear and minimising punching burrs.
  • One aim of this invention is to facilitate welding, such as spot welding, while minimising, e.g. the risk of crack formation, etc..
  • Another aim is to achieve an increase in quality compared to the prior art.
  • Figure 1 is a perspective view of a press-hardened sheet-metal product in the form of what is referred to as a B-pillar for a passenger car prior to subsequent cutting/subsequent punching.
  • Figure 2 is a perspective view of a press-hardened sheet-metal product in the form of what is referred to as a B-pillar for a passenger car after subsequent cutting/subsequent punching.
  • Figure 3 is a cross section through a forming tool along the line 3-3 of the sheet-metal product according to Figure 1 manufactured in the forming tool.
  • Figure 4 is a partial enlarged view of the forming tool according to Figure 3.
  • Figure 1 shows what is referred to as a B-pillar 10 for a passenger car, the said pillar/product/component being formed by press hardening.
  • Figure 2 shows the component 10 after subsequent finishing.
  • the component 10 is manufactured from a flat sheet-metal blank which is heated, then formed in a forming tool and cooled while being held in the pressing tool/forming tool so as to obtain the desired hardness.
  • the aforementioned method of manufacture is referred to as press hardening and results in dimensionally accurate products of high strength since the sheet-metal component is pressed during the hardening process.
  • the component 10 shown has a central part in the form of a hat-shaped section with a central flange 15, two web parts 16,17 and side flanges 18,19.
  • the component 10 is provided at its upper and lower ends with parts 25,26 for connection to a vehicle chassis.
  • Figure 3 is a cross section through a central part of a press-hardening tool/forming tool 50 used to form and harden the component 10.
  • the press-hardening tool includes an upper 51 and a lower 52 tool half.
  • Figure 4 shows part of the press-hardening tool 50 serving for forming and hardening of the side flange 18 on a larger scale.
  • an elongated soft zone A is arranged at a distance L from the free edge of the side flange 18, as a result of which the edge part 18a of the side flange acquires a degree of hardness that increases the dimensional accuracy of the component 10 when the component 10 leaves the tool 50.
  • the soft zone A is obtained in that recesses 55,56 are arranged in the upper 51 and lower 52 tool halves.
  • insulating plates can be arranged in the tool so as to obtain the zone part A.
  • Another alternative is to arrange local heating coils in the cooling tool in order to obtain the zone part A.
  • the soft zone A is also suitable for various subsequent welding operations, such as, e.g. spot welding, thereby making it possible to minimise the risk of crack formation.
  • the elongated or oblong soft zone A positioned close to the outer edge can be arranged around the entire periphery of a component or along parts thereof depending on the respective desired aim.
  • One field of application is when subsequent finishing is required in order to observe close tolerances.
  • the soft edge zone may be made narrow.
  • curved or bowed/bent edge trimming is made possible in that the elongated or oblong soft zone A is designed to be curved so as to correspond to the desired configuration of the curved edge trimming.
  • a bowed cutting line of the aforementioned type is illustrated in Figure 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention relates to a method of manufacturing a formed sheet-metal product (10), in which a heated initial blank is formed and cooled in a pressing tool (50) in such a manner that hardening of the sheet-metal product takes place in the pressing tool. An elongated soft zone (A) is produced inside a hardened edge area (18a) of the sheet-metal product (10) by preventing hardening or by producing a lower degree of hardness in the said zone (A). Subsequent cutting or punching or another working process is carried out in the soft zone (A) so that the formed sheet-metal product (10) acquires the intended final tolerance. The invention also relates to a press-hardened sheet-metal product manufactured by the method.

Description

METHOD OF MANUFACTURING A PRESS-FORMED SHEET-METAL PRODUCT
Technical field
This invention relates to a method of manufacturing a formed sheet-metal product according to the pre-characterising part of claim 1. The invention also relates to a product manufactured by the method.
Background of the invention
In what are referred to as press-hardened sheet-metal products, subsequent cutting or subsequent punching is sometimes necessary in order to meet prescribed tolerance requirements. It is important that the dimensional accuracy of the product is retained during subsequent finishing. Subsequent welding operations, such as, e.g. spot welding, also have to be carried out without compromising the strength of the respective final product.
Aim of the invention
One aim of this invention is to provide a method allowing for the advantageous subsequent finishing of press-hardened products without compromising the form tolerances of the products.
One aim is to produce a soft edge zone with good tolerances while simultaneously reducing tool wear and minimising punching burrs.
One aim of this invention is to facilitate welding, such as spot welding, while minimising, e.g. the risk of crack formation, etc..
Another aim is to achieve an increase in quality compared to the prior art.
The aim of the invention is achieved in that the method of manufacture and the press-hardened sheet-metal product have the features specified in the claims. Brief description of the drawings
Figure 1 is a perspective view of a press-hardened sheet-metal product in the form of what is referred to as a B-pillar for a passenger car prior to subsequent cutting/subsequent punching.
Figure 2 is a perspective view of a press-hardened sheet-metal product in the form of what is referred to as a B-pillar for a passenger car after subsequent cutting/subsequent punching.
Figure 3 is a cross section through a forming tool along the line 3-3 of the sheet-metal product according to Figure 1 manufactured in the forming tool.
Figure 4 is a partial enlarged view of the forming tool according to Figure 3.
Detailed description of the illustrated embodiment
Figure 1 shows what is referred to as a B-pillar 10 for a passenger car, the said pillar/product/component being formed by press hardening. Figure 2 shows the component 10 after subsequent finishing.
The component 10 is manufactured from a flat sheet-metal blank which is heated, then formed in a forming tool and cooled while being held in the pressing tool/forming tool so as to obtain the desired hardness. The aforementioned method of manufacture is referred to as press hardening and results in dimensionally accurate products of high strength since the sheet-metal component is pressed during the hardening process.
The component 10 shown has a central part in the form of a hat-shaped section with a central flange 15, two web parts 16,17 and side flanges 18,19. The component 10 is provided at its upper and lower ends with parts 25,26 for connection to a vehicle chassis.
Figure 3 is a cross section through a central part of a press-hardening tool/forming tool 50 used to form and harden the component 10. The press-hardening tool includes an upper 51 and a lower 52 tool half. Figure 4 shows part of the press-hardening tool 50 serving for forming and hardening of the side flange 18 on a larger scale. According to the invention, an elongated soft zone A is arranged at a distance L from the free edge of the side flange 18, as a result of which the edge part 18a of the side flange acquires a degree of hardness that increases the dimensional accuracy of the component 10 when the component 10 leaves the tool 50. The soft zone A is obtained in that recesses 55,56 are arranged in the upper 51 and lower 52 tool halves. This results in the formation of an air gap resulting in reduced cooling of the zone part A during the cooling process of the tool 50 and therefore in a lower degree of hardness. As an alternative to the abovementioned recesses 55,56, insulating plates can be arranged in the tool so as to obtain the zone part A. Another alternative is to arrange local heating coils in the cooling tool in order to obtain the zone part A.
When the component 10 as shown in Figure 1 has been produced by the method described hereinabove, subsequent finishing then follows. The aforementioned subsequent finishing is illustrated in Figure 2. The subsequent finishing in the example shown is carried out by edge trimming or edge punching, such that a sheet-metal strip/waste edge 60 is removed from the component 10, as will be clear from Figure 2. A new free edge 18b which is now soft is thus formed since the cutting/punching is carried out in the soft zone A, resulting in advantages from the point of view of the tool, the hard edge 18a having performed its shape-retaining role from the forming and hardening operation.
The soft zone A is also suitable for various subsequent welding operations, such as, e.g. spot welding, thereby making it possible to minimise the risk of crack formation.
It will be clear that the elongated or oblong soft zone A positioned close to the outer edge according to the invention can be arranged around the entire periphery of a component or along parts thereof depending on the respective desired aim. One field of application is when subsequent finishing is required in order to observe close tolerances. The soft edge zone may be made narrow. According to the invention, curved or bowed/bent edge trimming is made possible in that the elongated or oblong soft zone A is designed to be curved so as to correspond to the desired configuration of the curved edge trimming. A bowed cutting line of the aforementioned type is illustrated in Figure 2.
It will thus be clear that the invention can be applied to components and profiles of any desired configuration. The invention is thus not limited to what is illustrated and described here, and amendments and modifications are possible within the scope of the following claims.

Claims

Claims
1. Method of manufacturing a formed sheet-metal product (10), in which a heated initial blank is formed and cooled in a pressing tool (50) in such a manner that hardening of the sheet-metal product takes place in the pressing tool, characterised in that an elongated or oblong soft zone (A) is produced inside a hardened edge area (18a) of the sheet-metal product (10) by preventing hardening or by producing a lower degree of hardness in the said zone (A).
2. Method according to claim 1 , characterised in that the soft zone (A) is achieved by means of slots (55,56), insulating inserts or heating coils in the pressing tool.
3. Method according to claim 1 or claim 2, characterised in that subsequent cutting or punching or another working process is carried out in the soft zone (A) so that the formed sheet-metal product (10) acquires the intended final tolerance.
4. Method according to any one of claims 1-3, characterised in that a subsequent welding operation, e.g. spot welding, is carried out in the soft zone (A) in association with connection to a further component.
5. Press-hardened sheet-metal product, characterised in that it (10) in the formed and hardened state has a hardened edge part (18a) inside which an elongated or oblong soft zone (A) is situated.
6. Press-hardened sheet-metal product according to claim 5, characterised in that it in the finished state has a free edge part (18b) situated within the soft zone (A).
7. Press-hardened product according to claim 5 or claim 6, characterised in that the soft zone (A) has a bent or bowed shape.
8. Press-hardened product according to claim 6, characterised in that the free edge part (18b) has a bent or bowed shape.
PCT/SE2009/000177 2008-04-03 2009-04-02 Method of manufacturing a press-formed sheet-metal product WO2009123538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SESE0800756-9 2008-04-03
SE0800756 2008-04-03

Publications (1)

Publication Number Publication Date
WO2009123538A1 true WO2009123538A1 (en) 2009-10-08

Family

ID=41135805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2009/000177 WO2009123538A1 (en) 2008-04-03 2009-04-02 Method of manufacturing a press-formed sheet-metal product

Country Status (1)

Country Link
WO (1) WO2009123538A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011071433A1 (en) * 2009-12-13 2011-06-16 Gestamp Hardtech Ab A-pillar for a vehicle
WO2011071434A1 (en) * 2009-12-13 2011-06-16 Gestamp Hardtech Ab B-pillar for a vehicle
ES2423080A1 (en) * 2010-04-14 2013-09-17 Benteler Automobiltechnik Gmbh Body structure for an automobile and method for producing a structural component for a body structure
WO2015001114A1 (en) 2013-07-05 2015-01-08 Autotech Engineering, A.I.E. Metal part with controlled deformation orientation
FR3008012A1 (en) * 2013-07-05 2015-01-09 Autotech Engineering Aie METALLIC PIECE WITH CONTROLLED DEFORMATION ORIENTATION
WO2015130206A1 (en) * 2014-02-17 2015-09-03 Gestamp Hardtech Ab An elongate weld and a beam having such a weld
EP2366805B1 (en) 2010-03-12 2015-10-14 Benteler Automobiltechnik GmbH Method for manufacturing press hardened components
EP2415882B1 (en) * 2010-08-02 2016-03-23 Benteler Automobiltechnik GmbH Method for producing a shaped metal sheet from a rolled, non-hardenable aluminium alloy
DE102014221997A1 (en) * 2014-10-29 2016-05-04 Bayerische Motoren Werke Aktiengesellschaft Mold for the production of hot-formed components
US10486215B2 (en) 2017-06-16 2019-11-26 Ford Motor Company Apparatus and method for piercing and trimming hot stamped parts

Citations (5)

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Publication number Priority date Publication date Assignee Title
US5916389A (en) * 1996-06-07 1999-06-29 Ssab Hardtech Ab Method of producing a sheet steel product such as a reinforcement element in a larger structure
JP2003328031A (en) * 2002-05-13 2003-11-19 Nissan Motor Co Ltd Method for quenching pressed parts, quenching device, and pressed parts
WO2006038868A1 (en) * 2004-10-04 2006-04-13 Gestamp Hardtech Ab A method of hot stamping and hardening a metal sheet
US20060230806A1 (en) * 2005-04-19 2006-10-19 Friedrich Bohner Apparatus for shaping metal sheets
DE202008016877U1 (en) * 2008-12-19 2009-03-05 Voestalpine Automotive Gmbh Apparatus for producing partially hardened sheet steel components

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US5916389A (en) * 1996-06-07 1999-06-29 Ssab Hardtech Ab Method of producing a sheet steel product such as a reinforcement element in a larger structure
JP2003328031A (en) * 2002-05-13 2003-11-19 Nissan Motor Co Ltd Method for quenching pressed parts, quenching device, and pressed parts
WO2006038868A1 (en) * 2004-10-04 2006-04-13 Gestamp Hardtech Ab A method of hot stamping and hardening a metal sheet
US20060230806A1 (en) * 2005-04-19 2006-10-19 Friedrich Bohner Apparatus for shaping metal sheets
DE202008016877U1 (en) * 2008-12-19 2009-03-05 Voestalpine Automotive Gmbh Apparatus for producing partially hardened sheet steel components

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DATABASE WPI Week 200382, Derwent World Patents Index; AN 2003-889891, XP008113644 *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2509848B1 (en) 2009-12-13 2017-06-14 Gestamp HardTech AB A-pillar for a vehicle
KR101755391B1 (en) * 2009-12-13 2017-07-10 게스탐프 하르트테크 아베 B-pillar for a vehicle
KR101756078B1 (en) * 2009-12-13 2017-07-10 게스탐프 하르트테크 아베 A-pillar for a vehicle
CN102753422A (en) * 2009-12-13 2012-10-24 耶斯塔姆普硬技术股份公司 A-pillar for a vehicle
CN102762437B (en) * 2009-12-13 2015-10-07 耶斯塔姆普硬技术股份公司 The B post of vehicle
JP2013513514A (en) * 2009-12-13 2013-04-22 イェスタムプ・ハードテック・アクチエボラーグ B pillar for vehicles
US8465088B2 (en) 2009-12-13 2013-06-18 Gestamp Hardtech Ab A-pillar for a vehicle
WO2011071434A1 (en) * 2009-12-13 2011-06-16 Gestamp Hardtech Ab B-pillar for a vehicle
EP2509849A4 (en) * 2009-12-13 2014-03-19 Gestamp Hardtech Ab B-pillar for a vehicle
US8684449B2 (en) 2009-12-13 2014-04-01 Gestamp Hardtech Ab B-pillar for a vehicle
WO2011071433A1 (en) * 2009-12-13 2011-06-16 Gestamp Hardtech Ab A-pillar for a vehicle
CN102762437A (en) * 2009-12-13 2012-10-31 耶斯塔姆普硬技术股份公司 B-pillar for a vehicle
EP2509849A1 (en) * 2009-12-13 2012-10-17 Gestamp HardTech AB B-pillar for a vehicle
EP2366805B1 (en) 2010-03-12 2015-10-14 Benteler Automobiltechnik GmbH Method for manufacturing press hardened components
ES2423080A1 (en) * 2010-04-14 2013-09-17 Benteler Automobiltechnik Gmbh Body structure for an automobile and method for producing a structural component for a body structure
EP2415882B1 (en) * 2010-08-02 2016-03-23 Benteler Automobiltechnik GmbH Method for producing a shaped metal sheet from a rolled, non-hardenable aluminium alloy
FR3008012A1 (en) * 2013-07-05 2015-01-09 Autotech Engineering Aie METALLIC PIECE WITH CONTROLLED DEFORMATION ORIENTATION
WO2015001114A1 (en) 2013-07-05 2015-01-08 Autotech Engineering, A.I.E. Metal part with controlled deformation orientation
US9908559B2 (en) 2013-07-05 2018-03-06 Autotech Engineering, A.I.E. Metal part with controlled deformation orientation
US10994783B2 (en) 2013-07-05 2021-05-04 Autotech Engineering S.L. Metal part with controlled deformation orientation
US20170050272A1 (en) * 2014-02-17 2017-02-23 Gestamp Hardtech Ab Elongate Weld And A Beam Having Such A Weld
WO2015130206A1 (en) * 2014-02-17 2015-09-03 Gestamp Hardtech Ab An elongate weld and a beam having such a weld
DE102014221997A1 (en) * 2014-10-29 2016-05-04 Bayerische Motoren Werke Aktiengesellschaft Mold for the production of hot-formed components
US10537928B2 (en) 2014-10-29 2020-01-21 Bayerische Motoren Werke Aktiengesellschaft Molding tool for producing hot-formed components
US10486215B2 (en) 2017-06-16 2019-11-26 Ford Motor Company Apparatus and method for piercing and trimming hot stamped parts

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