KR20030081993A - High pressure nitrocarburizing treatment method of cold press die for automobile parts - Google Patents
High pressure nitrocarburizing treatment method of cold press die for automobile parts Download PDFInfo
- Publication number
- KR20030081993A KR20030081993A KR1020020020468A KR20020020468A KR20030081993A KR 20030081993 A KR20030081993 A KR 20030081993A KR 1020020020468 A KR1020020020468 A KR 1020020020468A KR 20020020468 A KR20020020468 A KR 20020020468A KR 20030081993 A KR20030081993 A KR 20030081993A
- Authority
- KR
- South Korea
- Prior art keywords
- gas
- pressure
- high pressure
- automobile parts
- nitriding
- Prior art date
Links
Classifications
-
- 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
- C23C8/28—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 one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
Abstract
Description
본 발명은 자동차부품 제조용 냉간프레스 금형의 고압 연질화 처리방법에 관한 것으로, 보다 상세하게는 자동차부품 제조용 냉간프레스 금형의 표면경화처리 방법중에서 종래 방법에 의해 금형을 상압으로 가스 연질화하였을 때보다 질화층이 치밀하고 표면경도가 현저히 높아 내마모성이 우수한 질화층을 만들 수 있는 고압 연질화처리 방법에 관한 것이다.The present invention relates to a high pressure soft nitriding treatment method of a cold press die for automobile parts manufacturing, and more particularly, in the surface hardening treatment method of a cold press die for automobile parts manufacturing, the nitriding of the die by the conventional method by gas pressure nitriding at normal pressure. The present invention relates to a high pressure soft nitridation treatment method capable of producing a nitride layer having a high layer and a high surface hardness.
탄소강 또는 합금강을 조질처리(켄칭＋템퍼링)하여 제조된 자동차 브라켓 제조용 금형에서 다이의 경우는 약 30만회, 그리고 펀치는 약 5만회 정도 사용하면 재료와의 마찰ㆍ마모에 의하여 금형에 치수변화가 생긴다. 금형치수의 변화가 생기면 제품의 치수가 변하므로 금형을 해체하여 수리하거나 새로운 금형으로 교체하여야 되는데, 이 때 소요되는 시간 및 경비로 인하여 생산성 저하와 생산비 증가가 수반된다.In the mold for manufacturing automobile bracket manufactured by refining carbon steel or alloy steel (quenching + tempering), when die is used about 300,000 times and punches about 50,000 times, the mold changes due to friction and wear with materials. . If the size of the mold changes, the dimensions of the product change, so the mold must be dismantled and repaired or replaced with a new mold, which is accompanied by a decrease in productivity and an increase in production costs due to time and expense.
일반적으로 금형의 수명을 연장시키기 위해서 실시하는 연질화처리에 의한 표면경화처리법은 금형재료의 표면에 질화와 동시에 침탄을 가하는 처리로서, 열처리 온도가 재료의 상변태점 이하이므로 열처리 후 변형이 거의 없어 2차가공이 필요하지 않으며, 표면의 경화층이 견고하고 균일하기 때문에 내마모성이 크게 향상되는 장점이 있으므로 많이 사용되고 있다.In general, the surface hardening treatment by soft nitriding treatment to extend the life of the mold is a process of nitriding and simultaneously carburizing the surface of the mold material. Since the heat treatment temperature is below the phase transformation point of the material, there is almost no deformation after the heat treatment. Since no machining is required, since the hardened layer of the surface is solid and uniform, the wear resistance is greatly improved.
종래의 상압 연질화처리는 탄소강 또는 합금강을 암모니아가스＋질소가스＋탄산가스의 혼합가스(가스압력 약 1기압)에서 550~590℃×3~6hr 연질화처리하는 방법으로 질화층의 표면경도가 낮고, 깊이방향의 경도분포가 급격하게 감소하며, 연질화처리한 다음의 켄칭시 발생하는 미세균열 때문에 스테인리스강 및 고장력강 등 고장력재료의 프레스가공시 금형의 수명을 단축시키는 결과를 초래한다.Conventional atmospheric soft nitriding treatment is a method in which carbon steel or alloy steel is subjected to soft nitriding treatment of a mixture of ammonia gas, nitrogen gas, and carbon dioxide (gas pressure of about 1 atmosphere) at 550 to 590 ° C x 3 to 6hr. Low, the hardness distribution in the depth direction is drastically reduced, resulting in shortening the life of the mold during press processing of high tensile materials such as stainless steel and high tensile strength steel due to microcracks generated during quenching after soft nitriding.
더욱이, 최근에는 자동차부품 제조업체의 생산성 향상을 위하여 프레스의 고속화, 고정밀도화가 요구되고, 자동차용 부품의 경량화를 위하여 고장력강 및 스테인리스 강판 등 고강도재료의 사용량이 증가함에 따라 피가공재와 금형의 마찰에 따른 마모가 심하게 일어나므로 금형의 수명은 갈수록 짧아지고 있는 추세이다.Moreover, in recent years, high speed and high precision of presses are required to improve the productivity of automobile parts manufacturers, and as the use of high strength materials such as high tensile strength steel and stainless steel sheets increases to reduce the weight of automobile parts, Since wear is severe, the life of the mold is getting shorter.
상기한 종래의 상압 연질화처리로 제조된 금형은 비교적 우수한 표면경도, 내마모성을 가지고 있어, 연강제 자동차부품의 프레스가공에서 큰 문제가 되지 않았으나, 고강도재료의 냉간프레스 가공시, 질화층의 표면경도 및 경도분포의 부적절, 그리고 연질화처리 후 켄칭시 발생하는 미세균열에 기인하여 금형의 수명을 현저히 단축시키는 결과를 초래하고 있어 이에 대한 개선의 여지는 여전히 남아 있다.The mold manufactured by the conventional atmospheric pressure nitriding treatment has a relatively excellent surface hardness and wear resistance, which is not a big problem in the press working of soft steel automotive parts, but the surface hardness of the nitride layer during cold pressing of high strength materials And due to inadequate hardness distribution and microcracks that occur during quenching after soft nitriding, significantly shortening the lifespan of the mold, leaving room for improvement.
본 발명은 상기와 같은 문제점을 해결하기 위하여, 종래의 상압 가스연질화 표면경화처리법을 개선하여 고강도재료의 프레스가공에 적합하도록 금형표면에 고압가스 연질화처리를 도입하여 치밀하고 표면경도가 높고 질화층의 경도분포가 양호하며 미세균열이 없는 질화층을 얻음으로써 금형의 수명을 향상시킬 수 있는 자동차부품 제조용 냉간프레스 금형의 고압 연질화 처리방법을 제공하고자 하는데 그 목적이 있다.In order to solve the problems described above, the present invention improves the conventional gas pressure nitriding surface hardening method and introduces a high pressure gas soft nitriding treatment on the mold surface to be suitable for press working of high-strength materials. The purpose of the present invention is to provide a high pressure soft nitriding treatment method of a cold press mold for automobile parts manufacturing, which can improve the life of the mold by obtaining a nitride layer having good hardness distribution and no microcracks.
도 1은 질화온도 570℃, 유지시간 1시간의 연질화 처리조건에서 가스압력에 따른 질화층의 두께 변화를 나타낸 그래프이다.1 is a graph showing the thickness change of the nitride layer according to the gas pressure under the nitriding temperature of 570 ° C. and the holding time of 1 hour.
도 2는 질화온도 570℃, 유지시간 1시간, 및 가스압력 5kgf/㎠의 연질화 처리조건에서 고압 연질화 처리 후 얻어진 질화층 및 기지조직을 나타낸 현미경 사진이다.Figure 2 is a micrograph showing the nitride layer and matrix structure obtained after the high pressure soft nitriding treatment under the nitriding temperature of 570 ℃, holding time 1 hour, and gas pressure of 5kgf / ㎠.
도 3은 질화처리된 금형에서 질화층의 깊이에 따른 경도변화를 나타낸 그래프이다.3 is a graph showing the hardness change according to the depth of the nitride layer in the nitrided mold.
상기한 목적을 달성하기 위하여, 본 발명에 따르면, 탄소강 또는 합금강을 내압 연질화로를 이용하여 압력 5~9kgf/cm2을 유지하는 암모니아가스＋질소가스＋탄산가스의 혼합가스에서 550~590℃의 온도로 1~3시간 연질화 처리하는 것을 특징으로 하는 자동차부품 제조용 냉간프레스 금형의 고압 연질화 처리방법이 제공된다.In order to achieve the above object, according to the present invention, carbon steel or alloy steel of 550 ~ 590 ℃ in a mixed gas of ammonia gas + nitrogen gas + carbonic acid gas to maintain a pressure of 5 ~ 9kgf / cm 2 using a pressure resistant nitriding furnace Provided is a high pressure nitriding treatment method for a cold press die for automobile parts manufacturing, characterized in that the nitriding treatment is performed at a temperature of 1 to 3 hours.
본 발명에서 가스압력을 5~9kgf/㎠로 제한한 이유는 가스압력이 5kg/㎠ 미만일 경우 도 1에 나타낸 바와 같이 충분한 질화층을 얻을 수 없고, 10kgf/㎠ 이상일 경우도, 양호한 질화층의 두께를 얻을 수 있다고 판단되나, 9kgf/㎠ 이상에서 가스압력이 증가함에 따라 두께의 증가는 미미하여, 9kgf/㎠까지로 제한하였다.The reason why the gas pressure is limited to 5 to 9 kgf / cm 2 in the present invention is that when the gas pressure is less than 5 kg / cm 2, a sufficient nitride layer cannot be obtained as shown in FIG. It can be determined that, but as the gas pressure increases at 9kgf / ㎠ or more increase in thickness is limited, limited to 9kgf / ㎠.
한편, 연질화 처리온도는 550℃ 미만일 경우, 질화층 두께를 0.1㎜ 이상 얻는데 10시간 이상의 장시간이 소요되고, 590℃을 초과할 경우, 질화층이 조대화되어 표면경도가 감소하여 바람직하지 못하다.On the other hand, when the soft nitriding treatment temperature is less than 550 ° C., it takes a long time of 10 hours or more to obtain a thickness of the nitride layer of 0.1 mm or more, and when it exceeds 590 ° C., the nitride layer becomes coarse and the surface hardness decreases, which is not preferable.
그리고, 본 발명의 연질화 처리시간에 관하여는, 상압(1kgf/㎠) 연질화처리에서 1hr 열처리시 0.03~0.04mm 정도의 질화층이 생성되어 원하는 두께를 얻기 위하여는 최소 3시간 이상의 열처리가 필요하였으나, 고압(5~9kgf/㎠)에서는 1hr 열처리에 0.1㎜ 이상을 얻을 수 있었으며, 필요에 따라서 열처리 시간을 3hr로 하면 0.3㎜까지 쉽게 얻을 수 있다.In addition, with respect to the soft nitridation treatment time of the present invention, a nitride layer having a thickness of about 0.03 to 0.04 mm is generated during a 1 hr heat treatment in an atmospheric pressure (1 kgf / cm 2) soft nitridation treatment, and at least three hours of heat treatment are required to obtain a desired thickness. However, at high pressure (5 ~ 9kgf / ㎠) it was possible to obtain more than 0.1mm in 1hr heat treatment, if necessary, if the heat treatment time is 3hr can be easily obtained up to 0.3mm.
본 발명은 자동차부품 제조용 냉간프레스 금형의 표면경화처리방법중의 하나인 가스 연질화처리법의 개선방안이다. 기존의 연질화처리법에서는 상압하에서 연질화를 실시하였으나, 본 발명에서는 가스압력을 높여서 연질화 효율을 높이고, 표면경도와 내마모성을 향상시켜 금형의 수명을 연장시킬 수 있다.The present invention is an improvement of the gas soft nitriding treatment which is one of the surface hardening treatment methods of the cold press die for automobile parts manufacturing. In the conventional soft nitriding method, the soft nitriding was performed under normal pressure, but in the present invention, the gas pressure is increased to increase the soft nitriding efficiency, and the surface hardness and the wear resistance may be improved to extend the life of the mold.
이 때 연질화로는 15kgf/㎠의 내압을 견딜 수 있는 스테인리스제 내압 질화처리로를 이용한다.At this time, the soft nitriding furnace uses a pressure resistant nitriding furnace made of stainless steel capable of withstanding a pressure of 15 kgf / cm 2.
이러한 내압 연질화처리로를 이용하여 연질화처리하면 질소가 금형의 표면으로 확산하여 질화층을 형성한다. 고압 연질화처리로 형성된 질화층의 두께는 0.12~0.15mm 정도로 상압 연질화처리의 0.03~0.04mm 정도에 비하여 3배 정도가 되며, 연질화처리 시간도 1/3 정도로 단축된다. 또한 상압 연질화처리시 발생한 미세균열은 전혀 발생하지 않는다.When the nitriding treatment is performed using the pressure resistant nitriding furnace, nitrogen diffuses to the surface of the mold to form a nitride layer. The thickness of the nitride layer formed by the high pressure soft nitridation treatment is about 0.12 to 0.15 mm, and about three times as much as about 0.03 to 0.04 mm of the normal pressure soft nitridation treatment, and the soft nitridation treatment time is also shortened by about one third. In addition, the microcracks generated during the atmospheric soft nitriding treatment do not occur at all.
이하에서는 본 발명의 바람직한 실시예를 종래의 예와 비교해서 상세히 설명하기로 한다.Hereinafter, a preferred embodiment of the present invention will be described in detail compared with the conventional example.
<실시예> :고압 연질화 처리방법 Example: High Pressure Soft Nitriding Treatment Method
본 발명의 고압 연질화처리에서는 탄소강과 합금강을 1050℃×1hr의 조건으로 노멀라이징 처리한 후, 600℃에서 1시간 동안 템퍼링하여 초기조직을 표준화하고, 이것을 용기압력 5~9kgf/㎠를 유지하는 암모니아가스(40%)＋질소가스(55%)＋탄산가스(5%)의 혼합가스에서 550~590℃×1~3hr 연질화 처리한다. 이 때 연질화로로는 15kgf/㎠의 내압을 견딜 수 있는 스테인리스제 내압 질화처리로를 이용한다.In the high pressure soft nitridation treatment of the present invention, after normalizing carbon steel and alloy steel under the condition of 1050 ° C × 1hr, tempering at 600 ° C for 1 hour to normalize the initial structure, and this is ammonia to maintain the vessel pressure of 5 ~ 9kgf / ㎠ The nitriding is carried out at 550 to 590 ° C for 1 to 3 hrs with a mixed gas of gas (40%) + nitrogen gas (55%) + carbon dioxide gas (5%). At this time, a stainless steel pressure resistant nitriding furnace that can withstand a pressure of 15 kgf / cm 2 is used.
<비교예> :상압 연질화 처리방법 <Comparative Example>: atmospheric pressure nitriding treatment method
상압 연질화처리에서는 탄소강과 합금강을 1050℃×1hr의 조건으로 노멀라이징 처리한 후, 600℃에서 1시간 동안 템퍼링하여 초기조직을 표준화하고, 이것을 용기압력 1kgf/㎠를 유지하는 암모니아가스(40%)＋질소가스(55%)＋탄산가스(5%)의 혼합가스에서 550~590℃×2~6hr 연질화처리한다.In the normal pressure soft nitridation treatment, after normalizing carbon steel and alloy steel under the condition of 1050 ° C × 1hr, tempering at 600 ° C for 1 hour to standardize the initial structure and ammonia gas (40%) maintaining the container pressure of 1kgf / ㎠ + Nitrogen gas (55%) + carbon dioxide gas (5%) mixed with 550 to 590 ° C x 2 to 6hr.
<실험예>Experimental Example
상기 실시예 및 비교예에서 제조한 연질화처리된 금형에 대하여 다음과 같은 방법으로 경도측정 및 조직관찰을 실시하였고, 그 결과를 도 1, 2, 3 및 표 1에 각각 나타내었다.For the soft-nitrided molds prepared in Examples and Comparative Examples, hardness measurement and histological observation were performed in the following manner, and the results are shown in FIGS. 1, 2, 3, and Table 1, respectively.
(1) 경도시험(1) hardness test
각각의 연질화처리 조건에 따른 질화층의 표면경도 및 확산층의 경도분포는 마이크로 비커스 경도계(하중 300g)를 이용하여 14회 측정한 후 최고값과 최저값을 제외한 나머지 값의 평균값으로 구하였다.The surface hardness of the nitride layer and the hardness distribution of the diffusion layer according to the soft nitriding conditions were measured 14 times using a micro-Vickers hardness tester (load 300g), and the average value of the remaining values except for the highest value and the lowest value was obtained.
(2) 질화층의 조직관찰(2) Organizational observation of nitride layer
질화처리한 후 시편의 조직, 질화층의 두께 변화 등을 관찰하기 위하여 시험편의 단면을 절단한 후, 경면 연마하고 3% nital 용액으로 부식하여 주사전자현미경으로 미세조직을 관찰하였다.After the nitriding treatment, the cross-section of the specimen was cut to observe the structure of the specimen and the thickness change of the nitride layer. The surface was then polished and corroded with a 3% nital solution to observe the microstructure with a scanning electron microscope.
(3) 마모시험(3) abrasion test
경화층의 내마모성을 조사하기 위하여 건식 마모시험기를 이용하여 마찰거리와 마모량의 관계를 조사하였다. 마모시험의 상대재로는 베어링강 SUJ2의 켄칭재(HRc62)를 사용하여 마찰속도 0.51m/sec, 하중 2.1㎏로 고정하고 마찰거리(400m)에 따른 마모량을 조사하였다.In order to investigate the wear resistance of the hardened layer, the relationship between the friction distance and the amount of wear was investigated using a dry wear tester. As a counterpart of the abrasion test, a quenching material (H Rc 62) of the bearing steel SUJ2 was used to fix the friction rate at 0.51 m / sec and the load at 2.1 kg, and the amount of wear according to the friction distance (400 m) was investigated.
도 1은 가스압력에 따른 질화층의 두께변화를 나타낸 것이다. 상압 연질화처리에서 질화층 깊이가 0.035mm 정도였으나 가스압력이 높아질수록 질화층의 두께가 증가하였다.1 shows the thickness change of the nitride layer according to the gas pressure. Although the depth of nitride layer was about 0.035mm in atmospheric pressure nitriding, the thickness of nitride layer increased with increasing gas pressure.
도 2는 SKD 11을 570℃에서 1시간, 혼합가스 압력 5kgf/cm2으로 고압 연질화처리하였을 때 질화층 및 기지조직을 나타낸 것이다. 상압 연질화처리시에는 질화층의 내부에 미세균열이 관찰되었으나, 가스의 압력을 5kgf/cm2으로 높였을 경우에는 미세균열이 전혀 발생하지 않았다. 이는 고압 연질화처리에서 형성된 질화층이상압에서 형성된 것보다 더 치밀하게 형성된다는 것을 보여주는 것이다.2 shows the nitride layer and the matrix structure when SKD 11 is subjected to high pressure soft nitriding at 570 ° C. for 1 hour at a mixed gas pressure of 5 kgf / cm 2 . During the normal pressure soft nitriding treatment, microcracks were observed inside the nitride layer, but when the gas pressure was increased to 5 kgf / cm 2 , no microcracks occurred. This shows that it is formed more densely than that formed at the nitride layer abnormal pressure formed in the high pressure soft nitriding treatment.
도 3은 질화온도 570℃, 유지시간 2시간, 및 가스압력 1kgf/㎠의 상압 연질화처리와 질화온도 570℃, 유지시간 1시간, 및 가스압력 5kgf/㎠의 고압 연질화처리에 있어서 금형 표면으로부터 질화층의 깊이방향으로의 경도분포를 비교하여 나타낸 것이다. 고압(5kgf/㎠)에서 질화처리한 경화층의 표면경도는 상압의 경우보다 250Hv 정도 더 높으며, 깊이방향의 양호한 경도분포는 프레스 작업시 최대 전단응력이 걸리는 0.05~0.10mm 부위의 경도를 증가시켜서 금형의 수명을 연장시킨다. 이 때, 질화온도는 적정온도인 550~590℃를 벗어날 경우, 질화층이 조대화되어 고압으로 연질화처리하여도 표면경도의 감소를 초래하는 현상도 관찰되었다.3 shows the surface of a mold in a high pressure soft nitriding treatment at a nitrogen temperature of 570 ° C., a holding time of 2 hours, and a gas pressure of 1 kgf / cm 2, and a high pressure soft nitriding treatment of a nitriding temperature of 570 ° C., a holding time of 1 hour, and a gas pressure of 5 kgf / cm 2. From the hardness distribution in the depth direction of the nitride layer. The surface hardness of the nitrided hardened layer at high pressure (5kgf / ㎠) is about 250 Hv higher than that of normal pressure, and the good hardness distribution in the depth direction increases the hardness of 0.05 ~ 0.10mm where maximum shear stress is applied during press work. Extend the life of the mold At this time, when the nitriding temperature deviated from the appropriate temperature of 550 ~ 590 ℃, the phenomenon that the surface hardness is reduced even when the nitriding layer is coarse and soft nitriding treatment was also observed.
표 1은 연질화처리시 가스압력에 따른 마모량의 비교를 나타낸 것이다. 본 발명에 따라 고압(5kgf/㎠)에서 연질화처리한 경화층은 종래의 상압에서 연질화처리한 경화층보다 마모량이 1/2 이상 적었다.Table 1 shows a comparison of the amount of wear according to the gas pressure during soft nitriding treatment. According to the present invention, the hardened layer subjected to soft nitriding at a high pressure (5 kgf / cm 2) had a wear amount of at least 1/2 less than that of the conventional hardened layer at normal pressure.
본 발명에 따른 자동차부품 제조를 위한 프레스금형의 고압 연질화처리 방법은 종래의 상압 연질화처리 방법보다 연질화 효과를 극대화하여 질화층깊이 0.1mm를 형성시키는데 소요되는 시간을 종래보다 훨씬 단축시키며, 표면경도도 상압 연질화처리 방법보다 250Hv 이상 높일 수 있다. 또한 질화층에 균열이 발생하지 않아 금형의 수명이 향상된다.The high pressure soft nitriding treatment method of the press mold for manufacturing automotive parts according to the present invention maximizes the soft nitriding effect than the conventional normal pressure soft nitriding treatment method, which shortens the time required to form the nitride layer depth 0.1mm, The surface hardness can also be increased by 250 Hv or more than the normal pressure soft nitriding method. In addition, since the crack does not occur in the nitride layer, the life of the mold is improved.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020020468A KR20030081993A (en) | 2002-04-15 | 2002-04-15 | High pressure nitrocarburizing treatment method of cold press die for automobile parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020020468A KR20030081993A (en) | 2002-04-15 | 2002-04-15 | High pressure nitrocarburizing treatment method of cold press die for automobile parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20030081993A true KR20030081993A (en) | 2003-10-22 |
Family
ID=32379058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020020020468A KR20030081993A (en) | 2002-04-15 | 2002-04-15 | High pressure nitrocarburizing treatment method of cold press die for automobile parts |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20030081993A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950008700A (en) * | 1993-09-01 | 1995-04-19 | 전성원 | Surface Treatment of Non-Steel Steel |
| JPH10211517A (en) * | 1997-01-28 | 1998-08-11 | Nippon Light Metal Co Ltd | Die for extruding aluminum and manufacture of the same |
| JPH11229113A (en) * | 1998-02-13 | 1999-08-24 | Dowa Mining Co Ltd | Oxide film removing method, gas nitro-carburizing method, and method for using organic chloride |
| JPH11269630A (en) * | 1998-03-23 | 1999-10-05 | Tokico Ltd | Surface treated steel member |
| KR100232268B1 (en) * | 1997-01-25 | 1999-12-01 | 김영희 | The heat treatment method of steel for die |
| JP2000054108A (en) * | 1998-08-06 | 2000-02-22 | Kohan Kogyo Kk | Die for forging |
| KR100349745B1 (en) * | 1999-12-31 | 2002-08-22 | 현대자동차주식회사 | Optimum nitrocarburizing method of power-steering gear for automobile |
-
2002
- 2002-04-15 KR KR1020020020468A patent/KR20030081993A/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950008700A (en) * | 1993-09-01 | 1995-04-19 | 전성원 | Surface Treatment of Non-Steel Steel |
| KR100232268B1 (en) * | 1997-01-25 | 1999-12-01 | 김영희 | The heat treatment method of steel for die |
| JPH10211517A (en) * | 1997-01-28 | 1998-08-11 | Nippon Light Metal Co Ltd | Die for extruding aluminum and manufacture of the same |
| JPH11229113A (en) * | 1998-02-13 | 1999-08-24 | Dowa Mining Co Ltd | Oxide film removing method, gas nitro-carburizing method, and method for using organic chloride |
| JPH11269630A (en) * | 1998-03-23 | 1999-10-05 | Tokico Ltd | Surface treated steel member |
| JP2000054108A (en) * | 1998-08-06 | 2000-02-22 | Kohan Kogyo Kk | Die for forging |
| KR100349745B1 (en) * | 1999-12-31 | 2002-08-22 | 현대자동차주식회사 | Optimum nitrocarburizing method of power-steering gear for automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2412520C (en) | Method of production of surface densified powder metal components | |
| Farrahi et al. | An investigation into the effect of various surface treatments on fatigue life of a tool steel | |
| EP3118346B1 (en) | Nitriding method and nitrided part production method | |
| CN104152916A (en) | Thermal treatment and plasma nitrocarburizing surface treatment process method for special wear-resistant die steel with ultrahigh heat conductivity for hot stamping | |
| JP2005531694A (en) | Surface modified stainless steel | |
| JP2794641B2 (en) | Cold-worked steel with high compressive strength | |
| KR20100133956A (en) | Material for projecting material for shot-peening, finished wire, production process, and projecting material for shot-peening | |
| EP2706131B1 (en) | Method for manufacturing machine part | |
| KR100464962B1 (en) | Quenched & tempered steel wire with superior characteristics of cold forging | |
| JP4752635B2 (en) | Method for manufacturing soft nitrided parts | |
| JP2007530780A (en) | Steel for mechanical parts, method for producing mechanical parts from the steel, and mechanical parts obtained by using the steel | |
| KR20030081993A (en) | High pressure nitrocarburizing treatment method of cold press die for automobile parts | |
| JP2021113338A (en) | Steel component and method for manufacturing the same | |
| CN1570192A (en) | Valve finisher surface modified processing method | |
| US20100139812A1 (en) | Case hardening titanium and its alloys | |
| US20100154938A1 (en) | Layered fe-based alloy and process for production thereof | |
| JPH10226817A (en) | Production of steel for soft-nitriding and soft-nitrided parts using this steel | |
| JPH10226818A (en) | Production of steel for soft-nitriding and soft-nitrided parts using this steel | |
| JPH0971848A (en) | High speed steel base powder alloy excellent in corrosion resistance | |
| JP2010222649A (en) | Production method of carbon steel material and carbon steel material | |
| Riofano et al. | Study of the wear behavior of ion nitrided steels with different vanadium contents | |
| JP2947099B2 (en) | Forming titanium sheet | |
| JP3053605B2 (en) | Metal members with excellent toughness and wear resistance | |
| JP2005350690A (en) | Cold forged component having excellent toughness and wear resistance, and its manufacturing method | |
| JPH11335734A (en) | Manufacture of steel material for soft-nitriding, and soft-nitrided parts using the steel material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E90F | Notification of reason for final refusal | ||
| E801 | Decision on dismissal of amendment | ||
| E601 | Decision to refuse application |