KR20010007913A - The reinforcing of hardness and a cooling method solving a change of color using nitrogen gas in a heat treatment progress - Google Patents
The reinforcing of hardness and a cooling method solving a change of color using nitrogen gas in a heat treatment progress Download PDFInfo
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- KR20010007913A KR20010007913A KR1020000062207A KR20000062207A KR20010007913A KR 20010007913 A KR20010007913 A KR 20010007913A KR 1020000062207 A KR1020000062207 A KR 1020000062207A KR 20000062207 A KR20000062207 A KR 20000062207A KR 20010007913 A KR20010007913 A KR 20010007913A
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- cooling
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- nitrogen gas
- nitrogen
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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
- C23C8/80—After-treatment
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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
- C23C8/08—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 only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
본 발명은 열처리 공정에서 질소가스를 이용한 피가공물의 경도보강과 변색을 해소하는 냉각방법에 관한 것이며 가공 완료된 철가공품의 경도를 보강하기 위하여 열처리 작업공정을 수행하게 되는데 이 때 철가공품을 침탄한 다음 냉각시킬 때 냉각로에서 질소를 충진 순환시켜 철가공품을 설정경도에 일치되도록 부여하면서 냉각하고 변색을 해소하여 고품질의 제품을 얻을 수 있도록 한 것이다.The present invention relates to a cooling method for reinforcing hardness and discoloration of a workpiece using nitrogen gas in a heat treatment process, and performing a heat treatment work step to reinforce the hardness of the finished iron workpiece. When it cools, it fills and circulates nitrogen in the cooling furnace to give iron products to the set hardness while cooling and eliminating discoloration to obtain high quality products.
일반적으로 각종 산업용 철가공품이나 자동차용 철가공품들은 철봉을 각종의 산업기계에서 가공하고 가공완료된 피가공물은 마모와 변형을 줄이기 위하여 열처리 작업공정을 수행하여 경도를 부여하여 제품화 되는데 이 때 가공완료된 철가공품을 열처리로에 넣어 800℃에서 2~4시간을 침탄시킨 다음 이를 냉각시키게 된다.In general, various industrial iron products or automotive iron products are processed into iron bars in various industrial machines, and processed workpieces are processed to give hardness by performing heat treatment to reduce wear and deformation. It was put into a heat treatment furnace and carburized for 2-4 hours at 800 ℃ and then cooled.
이 때 냉각의 방법으로는 피가공물의 용도와 설정경도에 따라 염화나트륨용액, 물, 열처리유등을 냉각조에 넣어 침지냉각하거나 로냉(瀘冷), 공냉등 여러가지의 냉각방법을 선택하게 된다.At this time, depending on the purpose and the set hardness of the workpiece, sodium chloride solution, water, heat-treated oil, etc. are put in a cooling bath, and various cooling methods such as furnace cooling and air cooling are selected.
이 때 가공물에 따라 냉각방법과 냉각시간을 설정하여 냉각작업을 수행하게 되나 작업환경이 동일하더라도 열처리 작업이 완료된 철가공품은 경도와 표면 색상에 심한 변화가 발생된다.At this time, the cooling method is performed by setting the cooling method and the cooling time according to the workpiece. However, even if the working environment is the same, the processed iron products that have undergone the heat treatment are severely changed in hardness and surface color.
즉 피가공물의 경도가 기준치에 미달하거나 또는 지나치게 높게 되거나 또는 표면 색상이 변색 등으로 품질이 균일하지 못하게 되므로 냉각에 고도의 숙련 기술과 주의가 요구되는 것이다.That is, because the hardness of the workpiece is less than the reference value or too high, or the color of the surface is not uniform due to discoloration, highly skilled skills and caution are required for cooling.
일례로 에어컨에 사용되는 콤프레셔축의 경우에는 소재를 연봉으로 가공하고 이를 경도 HRc20~30, 색상은 원색이 요구된다.For example, in the case of the compressor shaft used in the air conditioner, the material is processed into an annual salary, and the hardness HRc20 ~ 30, the primary color is required.
이 때 가공이 완료된 콤프레셔 축의 열처리공정은 900℃에서 3시간을 침탄시킨 다음 60℃의 염화나트륨용액, 물 또는 열처리유에서 10분간 침지시켜 냉각시키게 되면 경도가 HRc60 이상이 되고 색상은 양호하게 되나 경도가 기준치에 비하여 지나치게 높아 목적용도의 부품으로 사용할수가 없게 된다.At this time, the heat treatment process of the finished compressor shaft is carburized at 900 ° C for 3 hours and then immersed in 60 ° C sodium chloride solution, water or heat-treated oil for 10 minutes to cool. It is too high compared to the standard value and it cannot be used as a part for the intended use.
또 공냉의 경우에는 경도는 HRc10 이하가 되고 색상도 변색되므로 목적용도에 사용되지 못하고,In the case of air cooling, the hardness is less than HRc10 and the color is also discolored.
또 로냉의 경우에는 로에서 6~8시간을 서냉시키게 되면 경도가 HRc10~20이 되고 색상은 양호하나 냉각에 장시간이 소요되어 열처리 작업에서는 생산성이 떨어지게 된다.In the case of furnace cooling, if the cooling is slow for 6-8 hours in the furnace, the hardness becomes HRc10-20 and the color is good, but cooling takes a long time, resulting in decreased productivity in the heat treatment operation.
또 로냉의 환경이 되는 냉각실로 옮겨 4~5시간을 냉각시키게 되면 경도가 HRc5 이하이고 색상은 양호하나 경도가 떨어져 목적용도의 부품으로는 품질이 저하되므로 경도와 색상을 기준에 근접되는 로냉을 주로 하게 되나 이는 생산성이 떨어지고 또 경도의 오차가 심하며 균일한 품질을 반복하여 얻을 수 없는 폐단이 있다.In addition, if the product is transferred to a cooling chamber that is a cooling environment and cooled for 4 to 5 hours, the hardness is less than HRc5 and the color is good but the hardness is poor. However, this leads to a decrease in productivity, a severe error in hardness, and a closure that cannot be obtained by repeating uniform quality.
이에 본 발명은 종래의 제반 폐단을 해소하고 철가공품의 열처리 공정에서 침탄된 철가공품을 냉각시킬 때 냉각실에 철가공품을 장입하고 상온, 상압의 상태에서 질소가스를 충진 회류시켜 냉각하므로서 경도와 색상을 설정기준에 만족되면서도 생산성을 높일 수 있는 냉각방법을 제공함에 목적이 있다.Therefore, the present invention eliminates conventional waste ends and loads the iron products into the cooling chamber when cooling the carburized iron products in the heat treatment process of the iron products, and the hardness and color by filling and cooling nitrogen gas under normal temperature and normal pressure. It is an object of the present invention to provide a cooling method that can increase productivity while satisfying the setting criteria.
도1은 본 발명의 냉각로 블럭도1 is a block diagram of the cooling furnace of the present invention;
※ 도면의 주요부분에 대한 부호설명※ Explanation of Codes on Major Parts of Drawings
1 : 본체 2 : 벽면1: body 2: wall
3 : 분사관 4 : 질소탱크3: injection pipe 4: nitrogen tank
5 : 연결관 10 : 회수관5: connector 10: recovery tube
11 : 냉각기 12 : 송풍기11: cooler 12: blower
냉각실 본체(1)의 벽면(2)에 다수개의 질소가스 분사관(3)을 설치하면서 질소탱크(4)와 연결관(5)으로 연결하고, 본체(1) 상부에는 회수관(10)을 설치, 냉각기(11)와 송풍기(12)를 거쳐 연결관(5)에 연결 구성하여 침탄완료된 철가공품을 장입하여 질소를 충진 회류시켜 냉각하는 방법이다.Installing a plurality of nitrogen gas injection pipes (3) on the wall surface (2) of the cooling chamber body (1) by connecting to the nitrogen tank (4) and the connecting pipe (5), the recovery pipe (10) on the upper body (1) Is installed, connected to the connecting pipe (5) via a cooler (11) and a blower (12) to charge the carburized iron-worked product, and is filled with nitrogen and cooled by cooling.
도면에서 미설명부호 20은 밸브를 표시한 것이다.In the drawings, reference numeral 20 denotes a valve.
이와 같은 본 발명은 각종의 산업기계에서 가공완료된 철가공품을 열처리로에서 설정된 경도와 색상의 기준에 따라 설정온도에서 설정시간을 침탄시킨 다음 이를 냉각시키게 되는데 이 때 설정온도로 가열된 철가공품을 냉각실의 본체(1)내에 수납하여 밀폐시킨 다음 질소탱크(4)의 질소가스를 공급하게 되면 동질소가스는 분사관(3)에서 분사가 이루어지게 된다. 이 때 질소가스가 철가공품을 냉각하면서 발생되는 열을 질소가스가 흡수하여 질소가스의 온도가 상승하게 되고 이를 본체(1) 상부의 회수관(10)을 통하여 냉각기(11)를 통과하면서 질소가스는 냉각되고 냉각된 질소가스는 송풍기(12)에 의해서 연결관(5)을 통하여 질소탱크(4)의 질소와 함께 본체(1)내로 유입되고 순환되는 과정을 거치게 된다.The present invention such as carburizing the finished time at a set temperature according to the hardness and color standards set in the heat treatment furnace for the finished iron processed products in various industrial machines to cool it and then cooled the iron processed products heated to the set temperature When it is stored in the main body (1) of the seal and sealed and then supplies nitrogen gas from the nitrogen tank (4), the nitrogen gas is injected from the injection pipe (3). At this time, the nitrogen gas absorbs heat generated while the nitrogen gas cools the iron processed product so that the temperature of the nitrogen gas rises, and the nitrogen gas passes through the cooler 11 through the recovery pipe 10 above the main body 1. The cooled and cooled nitrogen gas is introduced into the main body 1 and circulated with the nitrogen of the nitrogen tank 4 through the connecting pipe 5 by the blower 12.
이 때 본체(1)내의 온도조정은 냉각기(11)를 거쳐 순환시키는 회수관(10)의 밸브(20) 동작으로 본체(1)내의 온도를 조절할 수 있게 되며 냉각온도의 조절로 냉각시간이 조절되므로서 경도와 철가공물의 색상이 조절된다.At this time, the temperature adjustment in the main body 1 is able to control the temperature in the main body 1 by the operation of the valve 20 of the recovery pipe 10 circulating through the cooler 11 and the cooling time is controlled by the adjustment of the cooling temperature. As a result, the hardness and color of the workpiece are controlled.
이 때 본체(1)내의 냉각실은 상온, 상압을 유지한다.At this time, the cooling chamber in the main body 1 maintains normal temperature and normal pressure.
이와 같이 철가공물의 냉각에 질소가스를 이용하게 되므로서 냉각시간을 로냉에서 5~6시간 소요되던 것을 30~분 1시간 이내로 단축시킬 수 있게 되면서 철가공품의 설정된 경도의 오차를 균일하게 조정할 수 있게 되며 색상의 변화도 해소시킬 수 있게 된다.In this way, nitrogen gas is used to cool the iron workpieces, so that the cooling time can be shortened from 30 minutes to 1 hour while the cooling time is 5 to 6 hours in the furnace cooling. Also, the color change can be eliminated.
또한 본체(1)내에 충진시키는 질소는 인체에 무해하고, 가스가 가열되었을 경우에는 순환이 이루어지면서 냉각되고 반복사용되므로서 냉각에 소요되는 질소의 소모량을 줄일 수 있게 되고 냉각온도와 시간의 조정이 용이하므로 각종 철가공품의 경도조정이 용이하게 되고 정밀하게 되는 것이다.In addition, the nitrogen charged in the main body 1 is harmless to the human body, and when the gas is heated, it is cooled and repeatedly used while being circulated, thereby reducing the consumption of nitrogen required for cooling and adjusting the cooling temperature and time. Since it is easy to adjust the hardness of the various iron workpieces become easy and precise.
이상과 같이 본 발명은 가공 완료된 철가공품을 열처리작업 공정에서 침탄 완료된 철가공품을 냉각로에서 냉각할 때 냉각로에 질소를 충진시켜 냉각하게 되므로서 경도와 색상을 설정기준에 정밀하게 맞출수 있게 되고 냉각작업의 소요시간을 단축하게 되므로서 생산성과 품질을 높일 수 있는 매우 유용한 발명이다.As described above, in the present invention, when the processed iron processed product is cooled in a cooling furnace by cooling the carburized iron processed product in a heat treatment operation process, nitrogen is charged in the cooling furnace to cool, so that the hardness and color can be precisely matched to the set criteria, and the cooling is performed. It is a very useful invention that can increase productivity and quality while reducing the time required for work.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20230037365A (en) * | 2021-09-09 | 2023-03-16 | (주)라드피온 | Apparatus of forming high functional compound on surface of material using ion implantation to prevent discoloration and yellowing of the material surface |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5531183A (en) * | 1978-08-26 | 1980-03-05 | Sumitomo Electric Ind Ltd | Sintering method of hard metal |
JPS5677324A (en) * | 1979-11-28 | 1981-06-25 | Kobe Steel Ltd | Cooling method and its apparatus in heat treatment of tool steel |
JPS63156031A (en) * | 1986-07-24 | 1988-06-29 | Sumitomo Electric Ind Ltd | Production of glass parent material having less refractive index than quartz |
JPH03230084A (en) * | 1990-02-02 | 1991-10-14 | Nippon Steel Corp | Cooling apparatus of metal melting furnace |
-
2000
- 2000-10-23 KR KR1020000062207A patent/KR20010007913A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5531183A (en) * | 1978-08-26 | 1980-03-05 | Sumitomo Electric Ind Ltd | Sintering method of hard metal |
JPS5677324A (en) * | 1979-11-28 | 1981-06-25 | Kobe Steel Ltd | Cooling method and its apparatus in heat treatment of tool steel |
JPS63156031A (en) * | 1986-07-24 | 1988-06-29 | Sumitomo Electric Ind Ltd | Production of glass parent material having less refractive index than quartz |
JPH03230084A (en) * | 1990-02-02 | 1991-10-14 | Nippon Steel Corp | Cooling apparatus of metal melting furnace |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230037365A (en) * | 2021-09-09 | 2023-03-16 | (주)라드피온 | Apparatus of forming high functional compound on surface of material using ion implantation to prevent discoloration and yellowing of the material surface |
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