KR100257023B1 - Bumper manufacturing process - Google Patents
Bumper manufacturing process Download PDFInfo
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- KR100257023B1 KR100257023B1 KR1019970064036A KR19970064036A KR100257023B1 KR 100257023 B1 KR100257023 B1 KR 100257023B1 KR 1019970064036 A KR1019970064036 A KR 1019970064036A KR 19970064036 A KR19970064036 A KR 19970064036A KR 100257023 B1 KR100257023 B1 KR 100257023B1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
- B60R2019/1813—Structural beams therefor, e.g. shock-absorbing made of metal
- B60R2019/1826—Structural beams therefor, e.g. shock-absorbing made of metal of high-tension steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
본 발명은 고강도 박육 스틸제 범퍼의 제조공정에 관한 것으로서, 더욱 상세하게는 고장력 강판 또는 연강(SPHC, SAPH)을 구부림(bending) 또는 타출(tempering) 후 용접하던 종래의 기술과는 달리, 고연성 강판(interstitial free steel plate)을 타출 및 용접을 한 후 산질화 처리를 하여 범퍼를 제조함으로써, 강도를 향상시킴은 물론, 강을 박육화할 수 있게 되어 강을 경량화할 수 있고, 또한 내식성이 향상되어 도장처리 공정을 생략할 수 있어 공정합리화를 도모할 수 있도록 개선된 고강도 박육 스틸제 범퍼의 제조공정에 관한 것이다.The present invention relates to a manufacturing process of a high-strength thin steel bumper, and more particularly, unlike the conventional technique of welding after bending or tempering high tensile steel or mild steel (SPHC, SAPH) By sintering and welding steel plate (interstitial free steel plate) and then oxidizing and manufacturing the bumper to improve the strength and thickness of the steel, the steel can be reduced in weight and the corrosion resistance is improved. The present invention relates to a manufacturing process of a high-strength thin steel bumper, which can be omitted, by which a coating treatment step can be omitted.
종래의 범퍼 제조공정은 고장력 강판 또는 연강(SPHC, SAPH)을 구부림 또는 타출한 후 통상적인 조건하에서 용접하는 방법을 이용하고 있다.The conventional bumper manufacturing process uses a method of bending under a high tensile strength steel sheet or mild steel (SPHC, SAPH) or welding and welding under ordinary conditions.
그러나, 이러한 범퍼 제조공정은 소재의 강도가 30 ∼ 60㎏f/㎟ 급으로 강도에 문제가 있어서 박육화하기가 어려웠고, 또한 내식성이 감소되어 도장 처리를 필요로 하는 문제가 있었다.However, such a bumper manufacturing process has a problem in that the strength of the raw material is 30 to 60 kgf / mm 2, which makes it difficult to reduce the thickness, and further reduces the corrosion resistance and requires a coating treatment.
본 발명은 상기와 같은 종래의 범퍼 제조공정의 문제점을 개선하기 위하여,고연성 강판과 표면 열처리법을 조합시켜 고강도화를 통한 박육화로 강을 경량화시켰으며, 또한 내식성이 향상되어 도장처리 공정을 생략할 수 있어서 공정합리화를 가져올 수 있는 고강도 박육 스틸제 범퍼의 제조공정을 제공하는데 목적이 있다.The present invention, in order to improve the problems of the conventional bumper manufacturing process as described above, by combining the high-strength steel sheet and the surface heat treatment method to reduce the weight of the steel by thinning through high strength, and also to improve the corrosion resistance to omit the coating process It is an object of the present invention to provide a process for producing a high-strength thin steel bumper that can bring about process rationalization.
본 발명은 범퍼를 제조하는 공정에 있어서, 고연성 강판을 타출하고 용접한다음, 산질화 처리하여 고강도 박육 스틸제 범퍼를 제조하는 공정에 그 특징이 있다.The present invention is characterized in that in the step of manufacturing a bumper, a step of producing a high-strength thin steel bumper by sintering and welding a high-ductility steel sheet, followed by oxynitriding.
이와 같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.
본 발명은 고연성 강판을 타출 및 용접한 후 산질화 처리를 하여 범퍼를 제조함으로써, 강도를 향상시킴은 물론, 강을 박육할 수 있게 되어 강을 경량화할 수 있고, 또한 내식성이 향상되어 도장처리 공정을 생략할 수 있어 공정합리화를 도모할 수 있도록 개선된 고강도 박육 스틸제 범퍼의 제조공정에 관한 것이다.According to the present invention, a bumper is manufactured by oxidizing and nitriding a high ductile steel sheet, thereby improving strength and thinning steel, thereby reducing steel weight and improving corrosion resistance and coating treatment. The present invention relates to a process for producing a high-strength thin steel bumper that can be omitted so that the process can be rationalized.
본 발명에서는 종래 사용했던 고장력 강판이나 연강을 대신하여 고연성 강판을 사용한다. 여기서 고연성 강판은 그 기지조직이 연성 페라이트(ferrite)이므로 본 발명의 특징이 있는 산질화처리의 효과를 극대화시킬 수 있는 금속이며 또한 압출 성형성이 우수하여 정밀한 타출작업이 가능한 특징이 있다. 이러한 고연성강으로는 SPCE, SPCEN(JIS G 3141) 및 SCP3, SCP-N(KS A 3512) 중에서 선택된 1종 이상의 것을 사용한다.In the present invention, a high ductility steel sheet is used instead of the high tensile steel sheet and the mild steel used in the prior art. Here, the high ductility steel sheet is a metal capable of maximizing the effect of the oxynitride treatment having the characteristics of the present invention because its matrix structure is a soft ferrite, and also has excellent characteristics of extruded moldability for precise punching work. Such high ductility steels include one or more selected from SPCE, SPCEN (JIS G 3141), SCP3, and SCP-N (KS A 3512).
본 발명은 상기한 고연성강판을 통상적인 조건하에서 타출하고 용접한다.The present invention casts and welds the above high ductility steel sheet under conventional conditions.
그런 다음 산질화 처리를 수행하는데, 본 발명의 산질화 처리는 N2이송기체에 CO 및 NH3로 질화시킨 후 수증기 처리한 다음 오일로 급랭시킨다. 이러한 산질화 처리는 560 ∼ 590℃에서 60분 ∼ 180분동안 수행한다. 만일 상기 반응조건에서 반응온도가 560℃ 미만이면 암모니아 분해 및 질소원자 확산이 늦어져 질화가 잘 안되고, 반면에 590℃를 초과하면 활성 질소가스가 포화상태로 되고 취성이 높은 Fe2N 화합물이 생성될 우려가 있다. 또한, 반응시간이 60분 미만이면 질소원자 확산량이 적어서 질화층 형성이 안될 수 있으며, 반면에 180분을 초과하면 과다한 질화가 이루어져서 취성이 높은 Fe2N 화합물이 생성될 우려가 있다.The oxynitride treatment is then carried out. The oxynitride treatment of the present invention is nitridated with CO and NH 3 in an N 2 transfer gas, followed by steam treatment and then quenched with oil. This oxynitride treatment is performed at 560-590 degreeC for 60 minutes-180 minutes. If the reaction temperature is less than 560 ℃ under the reaction conditions, ammonia decomposition and nitrogen atom diffusion is delayed, nitriding is not good, whereas if it exceeds 590 ℃ active nitrogen gas is saturated and brittle Fe 2 N compound is formed There is a concern. In addition, when the reaction time is less than 60 minutes, the amount of nitrogen atom diffusion may not be formed to form a nitride layer, whereas if the reaction time exceeds 180 minutes, excessive nitriding may occur to form a highly brittle Fe 2 N compound.
또한, 상기의 산질화 처리시 사용하는 오일로는 일반적인 소입유를 사용해도 된다.Moreover, you may use general quenched oil as an oil used at the said oxynitride process.
상술한 바와 같이 본 발명의 제조공정에 의해 제조된 고강도 박육 스틸제 범퍼는 가압 성형성이 양호하므로 정밀한 타출 작업이 가능하고 강이 30%가 경량화되었고, 인장강도 및 항복강도가 80 ∼ 100% 향상되었으며, 내식성이 SST 140시간 이상으로 향상되었으며, 그로 인해서 20 ∼ 30%의 원가절감의 효과가 있음을 알 수 있다.As described above, the high-strength thin steel bumper manufactured by the manufacturing process of the present invention has a good press-molding property, so that precise punching work is possible, and the steel is lightened by 30%, and the tensile strength and yield strength are improved by 80 to 100%. Corrosion resistance has been improved to SST 140 hours or more, thereby reducing the cost of 20-30%.
이하, 본 발명을 실시예에 의거하여 상세히 설명하면 다음과 같은 바, 본 발명이 실시예에 의해 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 by the Examples.
실시예 1Example 1
고연성 강판인 SPCE-N(JIS G 3141)을 통상적인 공정에 의해 타출하고 이를 용접한 다음 질소가스 분위기 하에서 150분동안 580℃에서 수행하고, 16분동안 450℃의 반응조건에서 냉각시켰으며, CO기체 및 NH3를 각각 20,000 ㎖/min, 60,000㎖/min로 주입하여 산질화 처리하여 범퍼를 제조하였다.SPCE-N (JIS G 3141), a high ductility steel sheet, was cast by a conventional process, welded, and then subjected to 150 minutes at 580 ° C. under a nitrogen gas atmosphere, and cooled at 450 ° C. for 16 minutes. Bumper was prepared by injecting CO gas and NH 3 at 20,000 mL / min and 60,000 mL / min, respectively.
실험예 : 인장강도, 항복강도 및 연신율 측정Experimental Example: Measurement of tensile strength, yield strength and elongation
상기 실시예에서 제조한 산질화 처리된 고연성 강판, 산질화 처리하지 않은 고연성 강판 및 기존의 APFE60, SPRC35 및 AL 압출제의 인장강도, 항복강도 및 연신율을 통상적인 방법으로 각각 측정한다음, 그 결과를 다음 표 1에 나타내었다.The tensile strength, yield strength, and elongation of the oxynitride-treated high ductility steel sheet, the oxynitride-free ductile steel sheet, and the existing APFE60, SPRC35, and AL extruders, which were prepared in the above examples, were measured by conventional methods, respectively. The results are shown in Table 1 below.
실험예 2 : 내식성 비교Experimental Example 2: Corrosion Resistance Comparison
상기 실시예에서 제조한 산질화한 고연성 강판, 아연도금한 고연성강판 및 흑색도장한 고연성 강판의 염수 분무시험을하여 녹발생 시간을 측정한 다음 그 결과를 다음 표 2에 나타내었다. 이때, 염수분무시험은 KS A 9502에 지정한 방법으로 측정하였다.After the salt spray test of the oxynitride high ductility steel sheet, galvanized high ductility steel sheet and black painted high ductility steel sheet prepared in the above example, the rust occurrence time was measured, and the results are shown in Table 2 below. At this time, the salt spray test was measured by the method specified in KS A 9502.
실험예 3 : 인장하중 및 항복하중의 측정Experimental Example 3 Measurement of Tensile Load and Yield Load
상기 실시예에서 제조한 산질화 처리한 고연성 강판과 APFC60(일본 스미토모 금속 제품)의 두께, 인장하중, 항복하중을 측정한다음 결과를 표 3에 나타내었다. 두께는 다이알 게이지에 의하여 측정하였고, 인장하중은 쥐익(ZWICK) 20톤 인장시험기로 JIS Z 2241에 의하여 측정하였고, 항복하중은 쥐익(ZWICK) 20톤 인장시험기로 JIS Z 2241에 의하여 측정하였다.Table 3 shows the results of measuring the thickness, tensile load, and yield load of the oxynitride-treated high ductile steel sheet and APFC60 (manufactured by Sumitomo Metal, Japan). The thickness was measured by a dial gauge, the tensile load was measured by JIS Z 2241 with a ZWICK 20 ton tensile tester, the yield load was measured by JIS Z 2241 with a ZWICK 20 ton tensile tester.
상술한 바와 같이, 본 발명에 따라 제조한 고강도 박육 스틸제 범퍼는 인장강도, 항복강도 및 내식성이 향상되었고, 또한 경량화되었으며, 그로 인해서 원가절감의 효과가 있음을 알 수 있다.As described above, the high-strength thin steel bumper manufactured according to the present invention can be seen that the tensile strength, yield strength and corrosion resistance is improved, and also reduced in weight, thereby reducing the cost.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970064036A KR100257023B1 (en) | 1997-11-28 | 1997-11-28 | Bumper manufacturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970064036A KR100257023B1 (en) | 1997-11-28 | 1997-11-28 | Bumper manufacturing process |
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| Publication Number | Publication Date |
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| KR19990043056A KR19990043056A (en) | 1999-06-15 |
| KR100257023B1 true KR100257023B1 (en) | 2000-08-01 |
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| KR1019970064036A KR100257023B1 (en) | 1997-11-28 | 1997-11-28 | Bumper manufacturing process |
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- 1997-11-28 KR KR1019970064036A patent/KR100257023B1/en not_active IP Right Cessation
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