KR100514984B1 - Method for manufacturing of member for automobile - Google Patents
Method for manufacturing of member for automobile Download PDFInfo
- Publication number
- KR100514984B1 KR100514984B1 KR10-2003-0026703A KR20030026703A KR100514984B1 KR 100514984 B1 KR100514984 B1 KR 100514984B1 KR 20030026703 A KR20030026703 A KR 20030026703A KR 100514984 B1 KR100514984 B1 KR 100514984B1
- Authority
- KR
- South Korea
- Prior art keywords
- weight
- heat treatment
- direct current
- manufacturing
- less
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000011572 manganese Substances 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 15
- 239000012779 reinforcing material Substances 0.000 abstract description 15
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 238000003466 welding Methods 0.000 abstract description 7
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000001000 micrograph Methods 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49616—Structural member making
- Y10T29/49622—Vehicular structural member making
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)
- Body Structure For Vehicles (AREA)
- Heat Treatment Of Articles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
본 발명은 자동차용 멤버의 제조방법에 관한 것으로서, 철(Fe)을 주재로 하고, 여기에 탄소(C) 0.20 ~ 0.25 중량%, 규소(Si) 0.3 중량% 이하, 망간(Mn) 1.0 ~ 1.2 중량%, 인(P) 0.02 중량% 이하, 황(S) 0.005 중량% 이하가 함유되어 있는 것을 특징으로 하는 자동차의 멤버용 소재 조성물과, 이러한 조성물의 소재를 프레스 가공하여 성형한 후, 기존의 보강재가 용접되는 위치에 직접통전 가열법에 의한 열처리를 실시함으로써, 고강도 멤버의 제조가 가능해지도록 한 자동차용 멤버의 제조방법에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a member for automobiles, based on iron (Fe), including 0.20 to 0.25 wt% of carbon (C), 0.3 wt% or less of silicon (Si), and 1.0 to 1.2 of manganese (Mn). The member composition of the automobile, characterized in that the weight percent, phosphorus (P) 0.02% by weight or less, sulfur (S) 0.005% by weight or less, and the material of such a composition by pressing and molding, The present invention relates to a method for manufacturing a member for an automobile in which a high strength member can be manufactured by performing heat treatment by a direct current heating method at a position where a reinforcing material is welded.
본 발명에 의하면 상기와 같은 조성물로 이루어진 고장력 강판을 프레스 가공한 후, 보강재가 용접되는 위치에 고주파 가열방식인 직접통전 가열법에 의한 열처리를 실시하여 열처리부위에 경(硬)한 금속조직과 연(軟)한 금속조직이 용융되도록 함으로써, 보강재의 용접이 불필요하고, 부품 경량화를 도모할 수 있으며, 충돌 안전성을 향상시킬 수 있는 효과가 있다. According to the present invention, after the high-strength steel sheet made of the composition as described above is pressed, heat treatment by direct current heating method of high frequency heating method is performed at the position where the reinforcing material is welded, thereby hardening the hardened metal structure and softening on the heat treatment site. (I) By melting the metal structure, the welding of the reinforcing material is unnecessary, the weight of the component can be reduced, and the impact safety can be improved.
Description
본 발명은 자동차용 멤버의 제조방법에 관한 것으로서, 더욱 상세하게는 철(Fe)을 주재로 하고 이에 탄소(C), 규소(Si), 망간(Mn), 인(P), 황(S)을 적절히 함유시켜 구성함으로써 열처리 후 고강도 특성을 가지도록 개선시킨 자동차의 멤버용 소재 조성물과, 이러한 조성물의 소재를 프레스 가공하여 성형한 후, 기존의 보강재가 용접되는 위치에 고주파 가열방식인 직접통전 가열법에 의한 열처리를 실시함으로써, 고강도 멤버의 제조가 가능해지는 자동차용 멤버의 제조방법에 관한 것이다. The present invention relates to a method for manufacturing a member for an automobile, and more particularly, based on iron (Fe), carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) By appropriately containing the material composition for the member of the automobile which has been improved to have high strength properties after heat treatment, and the material of such a composition is formed by pressing the material, and then direct current heating by high frequency heating method at the position where the existing reinforcing material is welded. The present invention relates to a method for manufacturing a member for automobiles, wherein the high strength member can be manufactured by performing heat treatment by a method.
일반적으로, 자동차 부품으로 사용되는 멤버(member)는 고장력 강판 소재를 프레스 및 용접 가공하여 제조하여, 그 소재가 되는 강판은 성형성, 용접성 등이 요구된다.In general, a member used as an automotive part is manufactured by pressing and welding a high tensile steel sheet material, and the steel sheet used as the material requires formability, weldability, and the like.
상기 멤버는 차체의 정면, 측면, 후면에 서로 연결되어 설치되는 부품으로서, 도 6에 도시된 바와 같이, 프론트 사이드 멤버(100), 프론트 크로스 멤버(200), 센터플로워 레인포스 멤버(300), 프론트/리어 범퍼레일(400,500) 등으로 구성되어 있으며, 이는 충돌시 그 충격에너지를 흡수하여 차체 및 인명 피해를 최소화할 수 있도록 하는 일종의 충돌 안전 부재이다.As the members are connected to each other in the front, side, and rear of the vehicle body, as shown in Figure 6, the front side member 100, the front cross member 200, the center follower rain force member 300, It consists of a front / rear bumper rail (400, 500), etc., which is a kind of collision safety member that can absorb the impact energy in the event of a collision to minimize the car body and life damage.
또한, 상기 멤버는 차체의 대부분에 해당되는 부품이 고정되는 구조용 부품이기도 하다. The member is also a structural part to which parts corresponding to most of the vehicle body are fixed.
이러한 역할을 하는 멤버는 여러 개의 부품으로 구성되는데, 그 대부분은 보강재로서, 충돌시 차체의 변형을 최소화하기 위하여 고장력 강판을 사용하고 있다.Members that play this role are composed of several parts, most of which are reinforcements, and use high-strength steel to minimize the deformation of the vehicle body in the event of a collision.
대개, 상기 멤버는 고장력 강판을 이용하여 프레스 성형으로 제조하고, 이어서 프레스 성형된 강판에 보강재를 점용접으로 부착함으로써, 이러한 부품이 완성된다.Usually, such a member is completed by press forming using a high tensile steel sheet and then attaching the reinforcement by spot welding to the press formed steel sheet.
이때, 상기 보강재는 멤버의 강도를 보강하기 위한 것으로, 대체적으로 두꺼운 강판을 사용한다.In this case, the reinforcing material is to reinforce the strength of the member, and generally uses a thick steel sheet.
그러나 이러한 멤버는 형상이 복잡하기 때문에 프레스 성형이 어려워 인장강도가 35 ∼ 45㎏f/㎟ 급의 비교적 낮은 강도의 소재를 사용할 수 밖에 없었고, 그 결과 강도보강을 위해 보강재를 용접함으로써, 부품수 및 공정수의 증가와 원가 상승 등의 여러가지 문제점이 있다.However, these members are difficult to press-molded because of their complicated shape, so they have to use a material of relatively low strength with a tensile strength of 35 to 45 kgf / mm 2. As a result, by welding the reinforcing material for strength reinforcement, There are various problems such as an increase in the number of processes and an increase in cost.
따라서, 프레스 성형성이 충분히 고려되면서도 최종 완성된 멤버의 강도를 향상시킬 수 있으며, 이를 통해 경량화 및 연비 향상, 내구성 향상을 가능하게 하는 자동차용 멤버의 제조방법이 절실히 요구되고 있다. Therefore, while sufficiently considering the press formability, it is possible to improve the strength of the final finished member, through which there is an urgent need for a method for manufacturing a member for an automobile that enables weight reduction, fuel efficiency, and durability.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위해 발명한 것으로서, 철을 주재로 하고, 여기에 탄소(C), 규소(Si), 망간(Mn), 인(P) 그리고, 황(S)을 적절히 함유시킨 자동차의 멤버용 소재 조성물과, 이러한 조성물의 소재를 프레스 가공하여 성형한 후, 기존의 보강재가 용접되는 위치에 고주파 가열방식인 직접통전 가열법에 의한 열처리를 실시하는 자동차용 멤버의 제조방법을 개발한다.Therefore, the present invention has been invented to solve the above problems, based on iron, carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and sulfur (S) Of a member composition for automobiles which contains a suitable content of the member and a member for automobile members which are subjected to heat treatment by a direct current heating method, which is a high-frequency heating method, at a position where the existing reinforcing material is welded after being pressed and molded. Develop a manufacturing method.
즉, 본 발명의 주된 목적은 철(Fe)을 주재로 하고, 여기에 탄소(C) 0.20 ~ 0.25 중량%, 규소(Si) 0.3 중량% 이하, 망간(Mn) 1.0 ~ 1.2 중량%, 인(P) 0.02 중량% 이하, 황(S) 0.005 중량% 이하가 함유되어 있는 것을 특징으로 하는 자동차의 멤버용 소재 조성물과, 이러한 조성물의 소재를 프레스 성형성이 충분히 고려되면서도 최종 완성된 멤버의 강도를 향상시킬 수 있는 자동차용 멤버의 제조방법을 제공하는데 있다. That is, the main object of the present invention is based on iron (Fe), carbon (C) 0.20 to 0.25% by weight, silicon (Si) 0.3% by weight or less, manganese (Mn) 1.0 to 1.2% by weight, phosphorus ( P) 0.02% by weight or less, sulfur (S) 0.005% by weight or less, and the member composition of the vehicle, characterized in that the press formability is sufficiently considered while the material of the composition, the strength of the finished member An object of the present invention is to provide a method for manufacturing an automotive member that can be improved.
이하, 상기와 같은 목적을 달성하기 위한 본 발명의 특징에 대해 설명하면 다음과 같다. Hereinafter, the features of the present invention for achieving the above object are as follows.
본 발명은 철(Fe)을 주재로 하고, 여기에 탄소(C) 0.20 ~ 0.25 중량%, 규소(Si) 0.3 중량% 이하, 망간(Mn) 1.0 ~ 1.2 중량%, 인(P) 0.02 중량% 이하, 황(S) 0.005 중량% 이하로 이루어진 소재를 이용하여 자동차 멤버의 보강재가 용접되는 부위에, 직접통전 가열법으로 열처리하여 제조하는 것을 특징으로 한다. The present invention is based on iron (Fe), carbon (C) 0.20 ~ 0.25% by weight, silicon (Si) 0.3% by weight or less, manganese (Mn) 1.0 ~ 1.2% by weight, phosphorus (P) 0.02% by weight Hereinafter, using a material made of sulfur (S) 0.005% by weight or less, characterized in that the manufacturing region is heat-treated by direct current heating method to the welded reinforcement member of the car member.
특히, 상기 직접통전 가열법은 주파수 15 ~ 25kHz, 전력 40 ~ 60kW, 가열시간 20 ~ 40초, 냉각시간 15 ~ 25초, 냉각수량 1000 ~ 1500L/min, 가열온도 900℃이상의 조건인 것을 특징으로 한다. In particular, the direct current heating method is characterized in that the frequency 15 ~ 25kHz, power 40 ~ 60kW, heating time 20 ~ 40 seconds, cooling time 15 ~ 25 seconds, cooling water amount 1000 ~ 1500L / min, heating temperature 900 ℃ or more do.
이하, 첨부도면을 참조하여 본 발명의 구성에 대해 상세하게 설명하면 다음과 같다. Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.
본 발명은 프레스 성형 가공후에 기존의 보강재가 용접되는 위치에 직접통전 가열에 의한 열처리를 실시하여 최종 완성된 자동차 멤버(member)의 강도를 향상시킬 수 있고, 이를 통해 멤버의 경량화 및 내구성 향상을 가능하게 하는 자동차용 멤버의 제조방법에 관한 것이다.The present invention can improve the strength of the finished car member by performing a heat treatment by direct current heating to the position where the existing reinforcing material is welded after the press molding process, thereby reducing the weight and durability of the member It relates to a method for manufacturing a member for automobiles.
본 발명의 자동차의 멤버용 소재 조성물은 철(Fe)을 주재로 하고, 여기에 탄소(C) 0.20 ~ 0.25 중량%, 규소(Si) 0.3 중량% 이하, 망간(Mn) 1.0 ~ 1.2 중량%, 인(P) 0.02 중량% 이하, 황(S) 0.005 중량% 이하를 적절히 함유시킨 것이다. The material composition for the member of the automobile of the present invention is based on iron (Fe), carbon (C) 0.20 to 0.25% by weight, silicon (Si) 0.3% by weight or less, manganese (Mn) 1.0 to 1.2% by weight, 0.02 weight% or less of phosphorus (P) and 0.005 weight% or less of sulfur (S) are contained suitably.
먼저, 탄소(C)는 적정의 성형성을 확보하기 위하여 전체의 함량 중 0.20 ∼ 0.25 중량%로 포함시키며, 이때 함량이 0.25 중량%를 초과하는 경우에는 성형성이 저해되므로 바람직하지 않고, 0.20 중량% 미만에서는 소입성이 낮아 경도 확보가 어렵다. First, carbon (C) is included in an amount of 0.20 to 0.25% by weight of the total content in order to secure the appropriate formability, when the content exceeds 0.25% by weight is not preferable because the moldability is inhibited, 0.20 weight If it is less than%, it is difficult to secure hardness due to low quenchability.
또한, 규소(Si)는 탈산제로 사용되는 것으로서 전체의 함량 중 0.3 중량%로 포함시킨다. 여기서, 상기 규소(Si)의 잔류 함량이 0.3 중량%를 초과하면 역시 성형성이 떨어지므로 바람직하지 않다.In addition, silicon (Si) is used as a deoxidizing agent to include 0.3% by weight of the total content. In this case, when the residual content of the silicon (Si) exceeds 0.3% by weight, the moldability is also lowered, which is not preferable.
또한, 망간(Mn)은 고용강화 원소로서 일정한 강도 확보 및 인성 향상을 위하여 첨가되는 것이며, 소입성을 확보하기 위하여 전체의 함량 중 1.0 ∼ 1.2 중량%의 범위로 규제한다.In addition, manganese (Mn) is added to secure a certain strength and toughness as a solid solution strengthening element, and in order to secure the hardenability, it is regulated in the range of 1.0 to 1.2% by weight of the total content.
또한, 인(P)은 분순물로서 0.02 중량% 이하로 규제하며, 황(S) 역시 분순물로서 인성 및 성형성 확보를 위하여 0.005 중량% 이하로 규제한다. In addition, phosphorus (P) is regulated to less than 0.02% by weight as impurities, sulfur (S) is also regulated to 0.005% by weight or less to secure toughness and formability as impurities.
한편, 본 발명은 상기 조성물의 소재는 인장강도 38 ~ 55kgf/mm2이며, 상온에서 2상(페라이트+펄라이트)의 금속조직을 갖는 고장력 강판으로서, 이를 이용하여 소정의 열처리를 통해 자동차의 멤버를 제조하는 방법을 포함한다.On the other hand, the present invention is a material of the composition is a tensile strength of 38 ~ 55kgf / mm 2 , a high-tensile steel sheet having a metal structure of two-phase (ferrite + pearlite) at room temperature, by using a predetermined heat treatment using the member of the car It includes a method of manufacturing.
상기 자동차에 적용되는 멤버의 제조방법은 소재를 프레스 가공하여 성형한 후 열처리하는 단계를 포함하는 바, 본 발명에 따른 자동차 멤버의 제조방법은 상기 조성물의 소재를 이용한 열처리 방법에 그 특징이 있다.The method of manufacturing a member applied to the vehicle includes a step of heat-treating and then heat-processing a molded material, and the method of manufacturing a vehicle member according to the present invention is characterized by a heat treatment method using a material of the composition.
즉, 상기 조성물의 소재를 프레스 가공하여 소정의 설계 형상대로 멤버를 성형한 다음, 강도를 높이기 위하여 종래에 사용되는 보강재의 점용접 공정을 생략하고, 보강재가 용접되는 위치에, 가열물체에 전류를 직접 흘려 금속의 고유한 저항발열을 이용하는 기술인 직접통전 가열법에 의한 열처리를 국부적으로 수행하는 바, 주파수 15 ~ 25kHz, 전력 40 ~ 60kW, 가열시간 20 ~ 40초, 냉각시간 15 ~ 25초, 냉각수량 1000 ~ 1500L/min, 직접통전 가열온도 900℃ 이상의 조건 하에서 직접통전 가열법에 의한 열처리를 실시하여 고강도의 자동차 멤버를 제작한다.That is, the material of the composition is pressed to form a member in a predetermined design shape, and then a spot welding step of a reinforcing material conventionally used to increase the strength is omitted, and a current is applied to the heating object at the position where the reinforcing material is welded. Heat treatment is performed locally by direct current heating, a technology that uses the unique resistance heating of the metal by flowing directly. Frequency 15 ~ 25kHz, power 40 ~ 60kW, heating time 20 ~ 40 seconds, cooling time 15 ~ 25 seconds, cooling A high-strength automobile member is manufactured by performing heat treatment by the direct current heating method under the conditions of 1000 ~ 1500 L / min and the direct current heating temperature 900 ℃ or more.
이때, 주파수가 상기 범위를 벗어날 경우에는 박판소재의 용융이 발생할 수 있고, 또한 대규모의 전원공급장치가 필요해져 비효율적인 문제점이 있으며, 가열시간 및 냉각시간과 냉각수량은 부품의 변형을 제어하고 고강도 금속조직을 가능하게하는 중요한 조건으로 상기 범위를 벗어나면 기대되는 효과를 거두기 어렵다.At this time, when the frequency is out of the above range, melting of the thin plate material may occur, and there is an inefficient problem due to the need for a large-scale power supply device. The heating time, the cooling time, and the amount of cooling water control the deformation of the part, It is difficult to achieve the expected effect outside the above range as an important condition for enabling the metallographic structure.
그리고, 가열온도 900℃ 미만의 온도에서는 가열, 냉각에 의한 금속상 변태가이루어지지 않게 되므로, 상기 온도가 금속상 변태를 하기에 필요한 최소온도이다.In addition, since the metal phase transformation by heating and cooling is not performed at the temperature below 900 degreeC of heating temperature, the said temperature is the minimum temperature required for metal phase transformation.
상기와 같이, 직접통전 가열법에 의한 열처리가 수행된 자동차에 적용되는 멤버는 도 3과 도 4의 현미경 사진에서와 같이, 베이나이트 또는 마르텐사이트 금속조직으로 변태되고, 가열되지 않은 부위는 도 5의 현미경 사진에서와 같이, 페라이트+펄라이트의 금속조직으로 그대로 유지된다.As described above, the member applied to the vehicle subjected to the heat treatment by the direct current heating method is transformed into bainite or martensite metal structure, as shown in the micrographs of FIGS. 3 and 4, and the unheated portion is illustrated in FIG. 5. As in the micrograph, the metal structure of ferrite + pearlite remains intact.
다시말해서, 본 발명의 바람직한 구현예로서, 도 1에 도시된 바와 같이, 인장강도 38 ~ 55kgf/mm2인 고장력 강판을 직접통전 가열법으로 열처리하게 되면, IH-1, IH-4,5부위는 차체의 충돌 시 변형을 최대한 억제해야 하는 부분으로 인장강도가 약 120 ~ 160kgf/mm2인 가장 강한 마르텐사이트 조직을 부여하고, IH-2,3부위는 어느 정도 변형이 되어 충돌에너지를 흡수 가능한 부분으로 인장강도가 약 80 ~ 120kgf/mm2인 페라이트와 베이나이트 조직이 공존된다.In other words, as a preferred embodiment of the present invention, as shown in Figure 1, when the high strength steel sheet with a tensile strength of 38 ~ 55kgf / mm 2 heat treatment by direct current heating method, IH-1, IH-4,5 site Is the part that should suppress the deformation as much as possible when the collision of the car body. It gives the strongest martensitic structure with a tensile strength of about 120 ~ 160kgf / mm 2 , and IH-2,3 parts are deformed to some extent to absorb collision energy. In part, co-existing ferrite and bainite structures with tensile strengths of about 80-120 kgf / mm 2 exist.
이러한 금속조직의 차별화는 전술한 바와 같이, 가열온도, 가열시간, 냉각조건을 달리함으로써, 달성할 수 있다.As described above, the differentiation of the metal structure can be achieved by changing the heating temperature, the heating time, and the cooling conditions.
따라서, 이와같은 제조방법에 따르면, 보강재를 부착하지 않고도 동등이상의 기계적 물성을 얻을 수 있고, 그로 인해 부품의 경량화를 이룰 수 있고, 부품수를 저감시킬 수 있으며, 공정을 단축시킬 수 있는 자동차 멤버의 제조가 가능하게 된다. Therefore, according to such a manufacturing method, it is possible to obtain mechanical properties equal to or higher without attaching a reinforcing material, thereby reducing the number of parts, reducing the number of parts, and shortening the process. Manufacturing becomes possible.
이하, 다음의 실시예에 의거하여 본 발명을 상세히 설명하는 바, 본 발명이 다음의 실시에에 한정되는 것은 아니다. Hereinafter, the present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following embodiments.
실시예Example
먼저, 표 1은 고장력 강판의 조성물을 나타낸 것으로서, 하기 표 1의 고장력 강판을 통상적인 공정에 의하여 프레스 가공 성형하고, 가열온도 900℃ 이상인 직접통전 가열에 의한 열처리를 수행하여 자동차의 멤버를 제조하였으며, 물성 측정을 위한 시편을 제조하였다.First, Table 1 shows the composition of the high tensile steel sheet, and the high tensile steel sheet of Table 1 was press-molded by a conventional process, and a member of the automobile was manufactured by performing heat treatment by direct current heating having a heating temperature of 900 ° C. or higher. , A specimen for measuring physical properties was prepared.
비교예Comparative example
하기 표 1의 조성물을 갖는 고장력 강판을 통상적인 공정에 의하여 프레스 가공 성형하고, 보강재를 점용접으로 부착시켜 자동차의 멤버를 제조하였으며, 물성 측정을 위한 시편을 제조하였다. The high-strength steel sheet having the composition shown in Table 1 below was press-molded by a conventional process, and a reinforcing material was attached by spot welding to prepare a member of a vehicle, and a specimen for measuring physical properties was prepared.
실험예Experimental Example
상기 표 1에 나타내는 조성물의 소재이며, 특히 인장강도 38 ~ 55kgf/mm2인 고장력 강판으로 이루어진 실시예 및 비교예에서 제조한 시편의 기계적 물성을 하기와 같이 측정하였고, 다음의 표 2에 나타내었다.The mechanical properties of the specimens prepared in Examples and Comparative Examples, which are materials of the composition shown in Table 1 above, in particular, made of high tensile steel sheets having a tensile strength of 38 to 55 kgf / mm 2 , were measured as shown in Table 2 below. .
상기 표 2에 나타낸 바와 같이, 실시예의 직접통전 가열법으로 열처리된 자동차 멤버의 기계적 물성인 인장강도, 항복강도, 연신율, 중량 등이 보강재가 점용접된 멤버보다 상대적으로 우수하게 나타났음을 알 수 있다. As shown in Table 2, it can be seen that the tensile strength, yield strength, elongation, weight, and the like of the mechanical properties of the automotive member heat-treated by the direct current heating method of the embodiment were superior to that of the spot welded member. .
따라서, 이와 같이, 본 발명의 제조방법에 따라 제조된 자동차에 적용되는 멤버는 기존의 제조방법에 의한 멤버에 비하여 약 30% 이상의 경량화 효과를 얻을 수 있고, 고강도의 기계적 특성을 얻을 수 있음을 알 수 있다. Therefore, it can be seen that the member applied to the automobile manufactured according to the manufacturing method of the present invention can obtain a weight reduction effect of about 30% or more, and high strength mechanical properties, compared to the member of the existing manufacturing method. Can be.
상술한 바와 같이, 본 발명에 따른 자동차용 멤버의 제조방법에 의하면, 멤버를 프레스 가공하여 성형한 후, 보강재가 용접되는 부위에 직접통전 가열법을 이용하여 열처리를 수행함으로써, 그 부위에 대한 강도가 증가되어 기존의 보강재 용접공정이 배제되므로 이를 통해 공정수를 크게 줄일 수 있고, 상기 보강재의 배제에 따른 부품수가 저감되어 경량화 및 원가절감의 효과를 얻을 수 있다. As described above, according to the method for manufacturing a member for a vehicle according to the present invention, after the member is formed by pressing the heat treatment, the heat treatment is performed on the portion to which the reinforcing material is welded by using a direct current heating method, thereby providing strength to the portion. Since the existing reinforcing material welding process is increased, the number of processes can be greatly reduced, and the number of parts due to the exclusion of the reinforcing material is reduced, thereby reducing the weight and reducing the cost.
도 1은 본 발명에 따른 자동차의 멤버에 대한 통상의 구조와 강화부위를 나타내는 도면,1 is a view showing a conventional structure and the reinforced portion for the member of the vehicle according to the invention,
도 2는 본 발명에 따른 직접통전 가열법의 전류흐름을 나타내는 도면,2 is a view showing the current flow of the direct current heating method according to the present invention,
도 3은 본 발명에 따른 직접통전 가열법을 이용하여 열처리된 고강도 조직을 나타내는 현미경 사진,3 is a micrograph showing a high-strength tissue heat treated using a direct current heating method according to the present invention,
도 4는 본 발명에 따른 직접통전 가열법을 이용하여 열처리된 중간강도 조직을 나타내는 현미경 사진,Figure 4 is a micrograph showing a medium-strength tissue heat-treated using a direct current heating method according to the present invention,
도 5는 본 발명에 따른 직접통전 가열법을 이용하여 열처리되지 않은 부위의 금속조직을 나타내는 현미경 사진,Figure 5 is a micrograph showing the metal structure of the portion that is not heat treated using the direct current heating method according to the present invention,
도 6은 종래의 일반적인 자동차의 멤버를 나타내는 사시도이다. 6 is a perspective view showing a member of a conventional general automobile.
Claims (2)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0026703A KR100514984B1 (en) | 2003-04-28 | 2003-04-28 | Method for manufacturing of member for automobile |
| JP2003401950A JP2004323967A (en) | 2003-04-28 | 2003-12-01 | Method for manufacturing automobile member |
| DE10361694A DE10361694A1 (en) | 2003-04-28 | 2003-12-30 | Method for producing a structural support of a vehicle |
| US10/751,030 US20040211064A1 (en) | 2003-04-28 | 2003-12-31 | Method for manufacturing a structural member of a vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0026703A KR100514984B1 (en) | 2003-04-28 | 2003-04-28 | Method for manufacturing of member for automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20040095414A KR20040095414A (en) | 2004-11-15 |
| KR100514984B1 true KR100514984B1 (en) | 2005-09-14 |
Family
ID=33297368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR10-2003-0026703A Expired - Fee Related KR100514984B1 (en) | 2003-04-28 | 2003-04-28 | Method for manufacturing of member for automobile |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20040211064A1 (en) |
| JP (1) | JP2004323967A (en) |
| KR (1) | KR100514984B1 (en) |
| DE (1) | DE10361694A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA015065B1 (en) | 2007-04-04 | 2011-04-29 | Сумитомо Метал Индастриз, Лтд. | Car-body reinforcing member, front side member, and car-body side structure |
| SE0702513L (en) * | 2007-11-15 | 2009-04-28 | Gestamp Hardtech Ab | B-pillar for vehicles |
| JP5119475B2 (en) * | 2008-05-14 | 2013-01-16 | 新日鐵住金株式会社 | Center pillar reinforcing member and manufacturing method thereof |
| JP5198953B2 (en) * | 2008-07-02 | 2013-05-15 | Ｕｄトラックス株式会社 | Front underrun protector and manufacturing method thereof |
| JP5502600B2 (en) * | 2010-05-31 | 2014-05-28 | 本田技研工業株式会社 | Vehicle front structure |
| KR101257166B1 (en) * | 2011-01-28 | 2013-04-22 | 현대제철 주식회사 | Automotive side member using multiphase steel and the method of manufacturing the same |
| WO2015198867A1 (en) | 2014-06-26 | 2015-12-30 | 新日鐵住金株式会社 | Structural member for automobile body |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4533402A (en) * | 1984-02-16 | 1985-08-06 | Nhk Spring Co., Ltd. | Method of manufacturing a hollow stabilizer |
| US4714809A (en) * | 1986-08-15 | 1987-12-22 | Tocco, Inc. | Method and apparatus for shaping the surfaces of cams on a camshaft |
| JP4031603B2 (en) * | 2000-02-08 | 2008-01-09 | 三菱重工業株式会社 | High / low pressure integrated turbine rotor and method of manufacturing the same |
-
2003
- 2003-04-28 KR KR10-2003-0026703A patent/KR100514984B1/en not_active Expired - Fee Related
- 2003-12-01 JP JP2003401950A patent/JP2004323967A/en active Pending
- 2003-12-30 DE DE10361694A patent/DE10361694A1/en not_active Ceased
- 2003-12-31 US US10/751,030 patent/US20040211064A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE10361694A1 (en) | 2004-11-25 |
| JP2004323967A (en) | 2004-11-18 |
| US20040211064A1 (en) | 2004-10-28 |
| KR20040095414A (en) | 2004-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5231373B2 (en) | Method, work piece and use of work piece for making work piece | |
| JP5756774B2 (en) | Steel sheet for hot pressing, press-formed product, and method for producing press-formed product | |
| KR101052008B1 (en) | Steel pipe for high strength automobile parts and manufacturing method thereof | |
| JP5756773B2 (en) | Steel sheet for hot pressing, press-formed product, and method for producing press-formed product | |
| KR101330952B1 (en) | Hot stamping molding product and method of manufacturing the same | |
| KR101827187B1 (en) | Hot-pressing steel plate, press-molded article, and method for manufacturing press-molded article | |
| KR101119173B1 (en) | Method for manufacturing steel products having different strength using laser heat treatment and heat treated hardened steel used therein | |
| CZ20012994A3 (en) | Central column for motor vehicle | |
| KR101190396B1 (en) | Taylor welded hot stamping method and steel parts using the same | |
| KR101716624B1 (en) | Method for manufacturing press-molded article, and press-molded article | |
| US20110182765A1 (en) | Use of a steel alloy | |
| CN109207849B (en) | High-strength high-plasticity 1000 MPa-grade hot rolled steel plate and preparation method thereof | |
| EP2551365A1 (en) | High-strength steel plate with excellent warm workability | |
| JP5894470B2 (en) | Steel sheet for hot pressing, press-formed product, and method for producing press-formed product | |
| KR100514984B1 (en) | Method for manufacturing of member for automobile | |
| JP5894469B2 (en) | Steel sheet for hot pressing, press-formed product, and method for producing press-formed product | |
| JP4452157B2 (en) | 600-1200 MPa class high-strength member for automobiles with excellent strength uniformity in the member and method for producing the same | |
| KR102422302B1 (en) | Method of Manufacturing Medium Manganese Steel having Recovered Ductility by Restoring Original Microstructures After Forming | |
| US7163254B2 (en) | Folding top of a convertible automobile | |
| KR101185363B1 (en) | Control arm for automobile using quenching hardening steel and method of manufacturing the same | |
| KR101062080B1 (en) | How to make a lower control arm | |
| KR100406365B1 (en) | A METHOD OF MANUFACTURING 600MPa GRADE HIGH STRENGTH STEEL WITH LOW YIELD RATION | |
| KR101257166B1 (en) | Automotive side member using multiphase steel and the method of manufacturing the same | |
| KR20110118607A (en) | Steel pipes for automobile parts and manufacturing method thereof | |
| KR101447835B1 (en) | Manufacturing method of ultra high strength thin pipe for motors and bumper beam using the pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 20030428 |
|
| PA0201 | Request for examination | ||
| PG1501 | Laying open of application | ||
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 20050331 Patent event code: PE09021S01D |
|
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 20050630 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 20050907 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 20050908 End annual number: 3 Start annual number: 1 |
|
| PG1601 | Publication of registration | ||
| PR1001 | Payment of annual fee |
Payment date: 20080905 Start annual number: 4 End annual number: 4 |
|
| PR1001 | Payment of annual fee |
Payment date: 20090901 Start annual number: 5 End annual number: 5 |
|
| PR1001 | Payment of annual fee |
Payment date: 20100901 Start annual number: 6 End annual number: 6 |
|
| PR1001 | Payment of annual fee |
Payment date: 20110831 Start annual number: 7 End annual number: 7 |
|
| FPAY | Annual fee payment |
Payment date: 20120831 Year of fee payment: 8 |
|
| PR1001 | Payment of annual fee |
Payment date: 20120831 Start annual number: 8 End annual number: 8 |
|
| FPAY | Annual fee payment |
Payment date: 20130830 Year of fee payment: 9 |
|
| PR1001 | Payment of annual fee |
Payment date: 20130830 Start annual number: 9 End annual number: 9 |
|
| FPAY | Annual fee payment |
Payment date: 20140901 Year of fee payment: 10 |
|
| PR1001 | Payment of annual fee |
Payment date: 20140901 Start annual number: 10 End annual number: 10 |
|
| LAPS | Lapse due to unpaid annual fee | ||
| PC1903 | Unpaid annual fee |
Termination category: Default of registration fee Termination date: 20160809 |