KR20020084602A - Strengthening of steel sheet by near-infrared radiation - Google Patents
Strengthening of steel sheet by near-infrared radiation Download PDFInfo
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- KR20020084602A KR20020084602A KR1020010024005A KR20010024005A KR20020084602A KR 20020084602 A KR20020084602 A KR 20020084602A KR 1020010024005 A KR1020010024005 A KR 1020010024005A KR 20010024005 A KR20010024005 A KR 20010024005A KR 20020084602 A KR20020084602 A KR 20020084602A
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- steel sheet
- near infrared
- heat treatment
- infrared rays
- heat source
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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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
본 발명은 근적외선을 이용한 고장력강판 열처리법에 관한 것으로서, 더욱 상세하게는 근적외선(Near Infrared Radiation)이라는 0.8∼1.5㎛범위의 특정 파장의 광선을 열원으로 이용하는 고장력강판 열처리법에 관한 것이다.The present invention relates to a high tensile strength steel sheet heat treatment method using near infrared rays, and more particularly, to a high tensile strength steel sheet heat treatment method using a specific wavelength of 0.8 ~ 1.5 ㎛ range called Near Infrared Radiation as a heat source.
일반적으로, 고장력강판의 강도를 강화시키기 위해서는 강판의 조성을 조절하거나 또는 고온가열이 필요한 열처리 방법을 이용한다. 그 중, 열처리 방법으로는 간접가열법과 직접가열법이 있다. 이들 중, 우선 간접가열법은 노(furnace)를 이용하는 방법으로써 노내 분위기 온도를 높여줌으로써 피가열체를 고온으로 만들어주는 방법으로 주로 1회에 대량으로 열처리를 실시할 수 있는 장점이 있으나, 여전히 노내 위치에 따른 온도불균일, 승온에 필요한 시간이 많이 소요되는 문제점이 있어 왔다. 또한, 직접가열법은 고주파나 레이저 등의 열원을 이용하는 방법으로써, 국부적인 가열 및 순간가열이 가능하고 정밀한 온도제어가 가능하기 때문에 품질이 비교적 균일한 장점이 있다. 그러나, 이들 중 고주파를 열원으로 이용한 직접가열법의 경우는 고체의 자기유도현상을 응용한 기술로서 부품형상에 맞는 특별한 코일 제작이 요구되며 그 자체가 노하우로서 최종 열처리 물성에 큰 영향을 미치는 문제점이 있으며, 또한 재료에 따라 매우 높은 고주파대역을 필요로 하기 때문에 고주파를 발진시키기 위한 대규모의 설비가 요구되는 문제점도 있어 왔다. 그리고, 레이저를 열원으로 이용하는 직접가열법 또한 매우 효율적이고 청정한 에너지원으로 부각되고 있는데 반하여 열처리 수단으로서는 그 사용범위가 매우 제한적이라는 문제점이 있다. 즉, 매우 국소적이고 정밀한 부분에는 응용할 수 있지만 자동차부품과 같이 비교적 대물부품의 경우에는 큰 효과를 얻기 힘든 문제점이 있어 왔다.In general, in order to reinforce the strength of the high tensile steel sheet, the composition of the steel sheet is adjusted or a heat treatment method requiring high temperature heating is used. Among them, heat treatment methods include indirect heating and direct heating. Among these, indirect heating method is a method of using a furnace (furnace) to increase the atmosphere temperature in the furnace to make the heating element to a high temperature, there is an advantage that can be mainly heat treatment in large quantities at once, but still in the furnace Temperature non-uniformity according to the location, there has been a problem that takes a lot of time required for temperature rise. In addition, the direct heating method is a method of using a heat source such as a high frequency or a laser, and local heating and instant heating are possible, and precise temperature control is possible, so that the quality is relatively uniform. However, in the case of the direct heating method using high frequency as a heat source, it is required to manufacture a special coil suitable for the part shape as a technique applying the magnetic induction phenomenon of a solid, and as a know-how, it has a problem that greatly affects the final heat treatment properties. In addition, since a very high frequency band is required depending on the material, there has been a problem that a large-scale facility for oscillating high frequency is required. In addition, the direct heating method using a laser as a heat source is also emerging as a very efficient and clean energy source, whereas the use range of the heat treatment means is very limited. That is, although it can be applied to very local and precise parts, there is a problem that it is difficult to obtain a great effect in the case of relatively large parts such as automobile parts.
따라서, 상기와 같은 직집 또는 간접 열처리법의 여러 문제점을 개선시킬 수 있는 새로운 열처리법에 대한 개발 필요성이 절실히 대두되고 있는 실정이었다.Therefore, there is an urgent need for the development of a new heat treatment method that can improve various problems of the direct or indirect heat treatment methods.
이에, 본 발명의 별명자는 상기와 같은 문제점을 해결하기 위하여 예의 노력한 결과, 주파수 0.8∼1.5㎛범위의 근적외선을 목적하는 강판에 조사한 후, 통상의 방법대로 소입처리함으로써, 강판의 국부 강화처리에 유용할 뿐만 아니라, 환경친화적인 청정 열처리가 가능하고, 그 결과 보강재 없이도 높은 강도의 강판을 제조할 수 있음은 물론 경량화 효과도 함께 가져올 수 있고 원가도 절감할 수 있음을 확인함으로써, 본 발명을 완성하였다.Thus, the nickname of the present invention is useful for local reinforcement treatment of steel sheet by irradiating the target steel sheet to near-infrared rays in the frequency range of 0.8 to 1.5 占 퐉, and then quenching them in the usual manner. In addition, the present invention was completed by confirming that environmentally friendly clean heat treatment is possible, and as a result, a steel sheet of high strength can be manufactured without reinforcing material, as well as a weight reduction effect, and cost can be reduced. .
결국, 본 발명의 주된 목적은 열원으로서 주파수 0.8∼1.5㎛ 범위의 근적외선(Near Infrared Radiation)을 조사하는 단계를 포함하는 근적외선 이용 고장력강판 열처리법을 제공하는 데 있다.After all, the main object of the present invention is to provide a near-infrared high tensile steel plate heat treatment method comprising the step of irradiating near infrared radiation in the frequency range 0.8 ~ 1.5㎛ as a heat source.
이하, 본 발명의 근적외선을 이용한 고장력강판 열처리법에 대하여 보다 구체적으로 살펴보면 다음과 같다.Hereinafter, the high-strength steel plate heat treatment method using the near infrared ray of the present invention will be described in more detail.
본 발명은 고장력강판을 제조하는 데 있어서, 열원으로서 주파수 0.8 ∼ 1.5㎛ 범위의 근적외선(Near Infrared Radiation)을 조사하는 열처리법에 그 특징이 있다.The present invention is characterized by a heat treatment method for irradiating near infrared radiation in a frequency range of 0.8 to 1.5 占 퐉 as a heat source in manufacturing a high tensile strength steel sheet.
본 발명은 열원으로서 주파수 0.8 ∼ 1.5 ㎛범위의 근적외선(Near Infrared Radiation)을 사용한다. 왜냐하면, 열원이 상기 범위를 벗어나면 가시광선 영역 또는 단파, 중파적외선 영역에 있게 되므로 충분한 열방사량이 부족하기 때문에 바람직하지 않다.The present invention uses Near Infrared Radiation in the frequency range of 0.8 to 1.5 mu m as a heat source. Because the heat source is out of the above range is in the visible light region, or short-wave, medium-wave infrared region is not preferable because the amount of heat radiation is insufficient.
이하, 본 발명을 실시예에 의하여 더욱 상세히 설명하고자 한다. 그러나, 이들 실시예는 오로지 본 발명을 보다 구체적으로 설명하기 위한 것으로, 이들 실시예에 의하여 본 발명의 범위가 한정되지 않는다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.Hereinafter, the present invention will be described in more detail with reference to Examples. However, these examples are only for illustrating the present invention in more detail, it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .
실시예 1 ∼ 9Examples 1-9
본 발명에 따른 자동차 부품에 대한 적용성을 검토하기 위하여 다음의 조건하에서 표 1에 기재된 각각의 박판재에 대해 근적외선을 이용한 열처리를 수행하였다. 즉, 열처리 조건은 다음과 같다:In order to examine the applicability to the automobile parts according to the present invention, heat treatment using near infrared rays was performed on each of the sheet materials shown in Table 1 under the following conditions. That is, the heat treatment conditions are as follows:
(1) 광원: 근적외선(1) light source: near infrared
(2) 출력: 800 kW/㎡(2) power: 800 kW / ㎡
(3) 초점거리: 60 ㎜(3) Focal length: 60 mm
(4) 수평 에미터(Emitter), 평면 리플렉터(Reflector) 사용(4) Using horizontal emitters and planar reflectors
(5) 시편종류 및 규격: 고장력강판 9종 및 50 ×50 ㎜(5) Specimen type and specification: 9 kinds of high tensile steel sheet and 50 × 50 ㎜
(6) 가열온도: 950 ℃ 이상(6) heating temperature: above 950 ℃
(7) 냉각방법: 수냉(7) Cooling method: water cooling
그리고, 이와 같이 근적외선을 이용해 열처리된 각각의 시편을 대상으로 모재 및 소입경도값과 인장강도를 각각 추정하여 보았고 그 결과를 다음 표 1 에 요약하여 나타내었다.In addition, for each specimen heat-treated using near-infrared rays, the base metal, the stiffening hardness value, and the tensile strength were estimated, respectively, and the results are summarized in Table 1 below.
이상에서 상세히 설명한 바와 같이 본 발명은 근적외선을 이용한 열처리법에 관한 것이다. 따라서, 이러한 본 발명에 따른 근적외선을 이용한 열처리 방법은 목표로 하는 특정 강판의 국부만을 가열할 수 있어 열효율면에서 매우 우수할 뿐만 아니라, 종래의 강판의 국부 강화시 필요했던 보강재 및 공정을 줄일 수 있어 강판의 경량화를 이룰 수 있고 원가도 절감할 수 있는 효과가 있다. 또한, 레이저 가열방법 만큼이나 사용환경이 청정하여 환경친화적이며, 고주파 가열방법의 경우와 달리 별도의 가열코일이 필요치 않아 설비 또한 간단하고 경제적이면서 이론적인 최고 가열온도가 3000℃ 및 순간가열 등이 가능하다는 점에서 고주파 가열방법이 지니고 있는 장점도 그대로 지니고 있는 특징이 있다.As described in detail above, the present invention relates to a heat treatment method using near infrared rays. Therefore, the heat treatment method using the near-infrared ray according to the present invention can heat only a portion of the target specific steel sheet, which is very excellent in terms of thermal efficiency, and can reduce the reinforcement and the process required for local strengthening of the conventional steel sheet. The weight of the steel sheet can be achieved and the cost can be reduced. In addition, the environment is as environmentally friendly as the laser heating method is clean, and unlike the case of the high frequency heating method, a separate heating coil is not required, so the facility is simple and economical, and the theoretical maximum heating temperature is 3000 ℃ and instantaneous heating. In this respect, the advantages of the high frequency heating method are retained.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100501678B1 (en) * | 2002-05-24 | 2005-07-18 | 현대자동차주식회사 | Multi-temperature control heat treatment device using near infrared ray |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149275A (en) * | 1984-12-22 | 1986-07-07 | Sumitomo Electric Ind Ltd | Method for applying fluorocarbon resin to aluminum foil or aluminum alloy foil |
| JPH05275159A (en) * | 1992-03-25 | 1993-10-22 | Setsuo Tate | Infrared ray heating device |
| JP2000088456A (en) * | 1998-07-17 | 2000-03-31 | Mitsui Mining & Smelting Co Ltd | Method and apparatus for drying copper foil |
| JP2000256754A (en) * | 1999-03-08 | 2000-09-19 | Kobe Steel Ltd | Continuous heat treatment |
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2001
- 2001-05-03 KR KR1020010024005A patent/KR20020084602A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149275A (en) * | 1984-12-22 | 1986-07-07 | Sumitomo Electric Ind Ltd | Method for applying fluorocarbon resin to aluminum foil or aluminum alloy foil |
| JPH05275159A (en) * | 1992-03-25 | 1993-10-22 | Setsuo Tate | Infrared ray heating device |
| JP2000088456A (en) * | 1998-07-17 | 2000-03-31 | Mitsui Mining & Smelting Co Ltd | Method and apparatus for drying copper foil |
| JP2000256754A (en) * | 1999-03-08 | 2000-09-19 | Kobe Steel Ltd | Continuous heat treatment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100501678B1 (en) * | 2002-05-24 | 2005-07-18 | 현대자동차주식회사 | Multi-temperature control heat treatment device using near infrared ray |
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