KR100727196B1 - A constant velocity joint cage for vehicle and method for producing it - Google Patents

A constant velocity joint cage for vehicle and method for producing it Download PDF

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KR100727196B1
KR100727196B1 KR1020050121930A KR20050121930A KR100727196B1 KR 100727196 B1 KR100727196 B1 KR 100727196B1 KR 1020050121930 A KR1020050121930 A KR 1020050121930A KR 20050121930 A KR20050121930 A KR 20050121930A KR 100727196 B1 KR100727196 B1 KR 100727196B1
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South Korea
Prior art keywords
cage
carburizing
alloy steel
low carbon
joint cage
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KR1020050121930A
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Korean (ko)
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반형오
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현대자동차주식회사
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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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • 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
    • 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

Abstract

A constant velocity joint cage for vehicles with improved toughness and durability is provided, and a method for manufacturing the constant velocity joint cage for vehicles is provided to prevent surface hardness of the cage from being deteriorated and improve toughness of the cage by applying a carburizing-austempering process to a manufacturing process of the constant velocity joint cage for vehicles. In a method for manufacturing a constant velocity joint cage for vehicles by carburizing-austempering a low carbon Cr-Mo alloy steel, the method comprises the steps of: carburizing the low carbon Cr-Mo alloy steel at 900 to 930 deg.C for 250 to 300 minutes; slowly cooling the carburized low carbon Cr-Mo alloy steel to 400 to 450 deg.C; holding the slowly cooled low carbon Cr-Mo alloy steel at the 400 to 450 deg.C for 30 minutes; reheating the low carbon Cr-Mo alloy steel to 850 to 870 deg.C to heat-treat the low carbon Cr-Mo alloy steel; quenching the heat treated low carbon Cr-Mo alloy steel to 230 to 250 deg.C in a salt bath treatment tank; and austempering the quenched low carbon Cr-Mo alloy steel at the 230 to 250 deg.C for 15 to 30 minutes.

Description

차량용 씨. 브이. 조인트 케이지 및 그의 제조방법{A Constant Velocity Joint cage for vehicle and method for producing it}Car seeds. V. Joint cage and its manufacturing method {A Constant Velocity Joint cage for vehicle and method for producing it}

도 1은 일반적인 차량용 씨. 브이. 조인트 어셈블리를 도시한 분해사시도.1 is a typical car seeds. V. An exploded perspective view of the joint assembly.

도 2는 종래의 차량용 씨. 브이. 조인트 케이지 제조용 침탄열처리법을 나타낸 도면.2 is a conventional vehicle seed. V. A diagram showing the carburization heat treatment method for manufacturing a joint cage.

도 3은 본 발명에 따른 차량용 씨. 브이. 조인트 케이지 제조용 침탄-오스펨퍼링법을 나타낸 도면.3 is a vehicle seed according to the present invention. V. Figure showing the carburizing-ospemper method for producing a joint cage.

도 4a 및 도 4b는 종래와 본 발명의 방법에 의해 제조된 차량용 씨. 브이. 조인트 케이지의 표면조직 비교사진.4A and 4B are vehicle seeds manufactured by the method of the prior art and the present invention. V. Comparison of surface structure of joint cages.

도 5a 및 도 5b는 종래와 본 발명의 방법에 의해 제조된 차량용 씨. 브이. 조인트 케이지의 심부조직 비교사진.5A and 5B are vehicle seeds manufactured by the method of the prior art and the present invention. V. Deep tissue comparison picture of joint cage.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

4: 케이지4: cage

본 발명은 차량용 씨. 브이. 조인트 케이지 및 그의 제조방법에 관한 것으 로, 더욱 상세하게는 저탄소 Cr-Mo 합금강을 사용하여 열간단조, 노멀라이징, 가공, 침탄-오스템퍼링, 및 연삭 공정을 이용하여 충격인성, 열변형량, 및 굽힘피로강도 특성이 우수한 차량용 씨. 브이. 조인트 케이지 및 그의 제조방법에 관한 것이다.The present invention car seeds. V. The present invention relates to a joint cage and a method of manufacturing the same, and more particularly to the impact toughness, thermal strain, and bending fatigue using hot forging, normalizing, processing, carburizing-ostempering, and grinding processes using low carbon Cr-Mo alloy steel. Car seeds with excellent strength characteristics. V. It relates to a joint cage and a method of manufacturing the same.

일반적으로, 도 1에 도시된 바와 같은 차량용 씨. 브이. 조인트 어셈블리(C.V.Joint Assembly)는 변속기의 구동력을 차량 전륜에 전달해 주는 역할을 하는 중요 부품이며, 외륜(1)은 변속기에서 받은 구동력을 볼(3)에 전달해 주고, 내륜(2)은 상기 볼(3)에 의해서 받은 전달력을 샤프트에 전달해 주며, 케이지(cage, 4)는 내/외륜(1, 2)의 축방향 및 반경방향의 위치를 규제하는 역할을 하는 부품이다.Generally, a vehicle seed as shown in FIG. 1. V. The joint assembly (CVJoint Assembly) is an important part that transmits the driving force of the transmission to the front wheel of the vehicle, the outer ring (1) transmits the driving force received from the transmission to the ball (3), the inner ring (2) is the ball ( The transmission force received by 3) is transmitted to the shaft, and the cage (cage) 4 is a part that serves to regulate the axial and radial positions of the inner and outer rings (1, 2).

상기 케이지(4)는 침탄처리를 하는 고경도의 내륜(2) 및 볼(3) 베어링과 변속기 토오크(torque)의 구동력에 의해서 마찰을 하기 때문에 침탄처리를 실시할 수 밖에 없는 부품이다.The cage 4 is a component that cannot be carburized because friction is caused by the driving force of the hardened inner ring 2 and the ball 3 bearing and the transmission torque.

특히, 차량의 급선회시에는 과도한 충격응력의 부하 때문에 상대적으로 얇은 두께를 보유한 케이지(4)가 파손될 수 있으며, 현재 필드에서도 품질문제가 빈번히 발생되고 있는 부품이다.In particular, during the rapid turning of the vehicle, the cage 4 having a relatively thin thickness may be damaged due to the load of excessive impact stress, and the quality problem is frequently generated in the current field.

이러한 문제점을 해결하기 위해 침탄(carburizing)처리를 행하고 있는데, 상기 침탄처리방법은, 제품의 표면 내마모성 및 강도 향상을 위하여 실시하는 일반적인 표면경화처리 방법으로, 변속기기어 및 액슬 부품 등에 보편적으로 적용되는 열처리 방법이나, QT 처리보다 충격인성이 불리하므로 얇은 두께의 부품이나 충격하중을 많이 받는 부품은 취성문제 때문에 실시가 제한되는 열처리 방법이다. In order to solve this problem, carburizing is performed. The carburizing method is a general surface hardening method for improving the surface wear resistance and strength of a product, and is commonly used for transmission gears and axle parts. Since the impact toughness is worse than that of the QT process, the thin-walled part or the part subjected to a large impact load are heat treatment methods that are limited in practice due to brittleness.

또한, 침탄 급냉시 오일을 이용하기 때문에 전용 세제로 세척을 해야 하며 세척후 인성향상을 위하여 템퍼링을 실시해야만 한다. In addition, since the carburizing quenching oil is used, it must be washed with a dedicated detergent and tempered to improve toughness after washing.

그리고, 케이지의 경우 두께가 접촉부품보다 얇고 충격인성이 요구되는 부품이기 때문에 침탄열처리를 실시하기는 위험한 부품이지만 표면 내마모성 및 강도확보를 위해서 현실적으로 침탄열처리를 실시하고 있다.In the case of cages, the thickness of the cage is thinner than that of the contact parts, and the carburizing heat treatment is a dangerous component, but the carburizing heat treatment is realistically performed to secure the wear resistance and strength of the surface.

따라서, 종래에도 상기 케이지(4)의 강도와 내마모성을 확보하기 위해 침탄처리하여 사용해 왔는 데, 그는 도 2에 도시된 바와 같은 방법으로 이행되어 왔다.Therefore, in order to secure the strength and abrasion resistance of the cage 4, the carburizing process has been used in the past, which has been implemented by the method as shown in FIG.

즉, 900 내지 930℃에서 300분 동안 침탄처리하고, 그 후 850 내지 870℃로 서냉하여 30분 동안 유지시킨 다음에, 60 내지 120℃의 오일에서 유냉시킨다.That is, carburizing at 900 to 930 ° C. for 300 minutes, followed by slow cooling to 850 to 870 ° C. for 30 minutes, followed by oil cooling at 60 to 120 ° C. oil.

그리고, 150 내지 180℃에서 120분 동안 유지시킨 다음에 공냉시키는 템퍼링 처리를 행하였다.And the tempering process which hold | maintains at 150-180 degreeC for 120 minutes, and then air-cools was performed.

그러나, 상기와 같은 방법으로 케이지를 침탄처리할 경우에는 충격인성이나 내구력이 그렇게 크게 향상되지 못하였다.However, when carburizing the cage by the above method, the impact toughness and the durability did not improve so much.

따라서, 높은 충격인성 및 내구력을 가진 케이지를 개발하기 위해서 새로운 열처리방법이 제시될 필요가 있다 할 것이다.Therefore, a new heat treatment method needs to be proposed to develop a cage with high impact toughness and durability.

상기한 바와 같은 문제점을 해결하기 위한 본 발명의 목적은, 케이지의 표면경도를 저하시키지 않으면서 인성을 증대시키기 위하여 씨. 브이. 조인트 케이지의 제조 공정중 침탄-오스템퍼링 공정을 개발하여 적용시킴으로써, 인성 및 내구력이 향상된 차량용 씨. 브이. 조인트 케이지를 제공하는 데에 있다.An object of the present invention for solving the above problems is to increase the toughness without lowering the surface hardness of the cage. V. A vehicle seed having improved toughness and durability by developing and applying a carburizing-ostempering process in the manufacturing process of a joint cage. V. It is to provide a joint cage.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 실시예는, 저탄소 Cr-Mo 합금강을 침탄-오스템퍼링하여 차량용 씨. 브이. 조인트 케이지를 제조하는 방법에 있어서, 상기 침탄-오스템퍼링은, 900 내지 930℃에서 250 내지 300분 동안 침탄처리하는 단계; 400 내지 450℃로 서냉시키는 단계; 400 내지 450℃에서 30분 동안 유지하는 단계; 850 내지 870℃에서 재가열하여 열처리하는 단계; 염욕(salt bath) 처리조에서 230 내지 250℃까지 급랭시키는 단계; 및 230 내지 250℃에서 15분 내지 30분동안 오스템퍼링 처리하는 단계;를 포함하여 이루어진 것을 특징으로 한다.Embodiment according to the present invention for achieving the object as described above, car seed by carburizing-ostempering the low-carbon Cr-Mo alloy steel. V. A method of manufacturing a joint cage, the carburizing-ostempering comprises: carburizing at 900 to 930 ° C. for 250 to 300 minutes; Slow cooling to 400 to 450 ° C; Holding at 400 to 450 ° C. for 30 minutes; Reheating and heat treatment at 850 to 870 ℃; Quenching to 230 to 250 ° C. in a salt bath treatment bath; And an ostempering treatment at 230 to 250 ° C. for 15 to 30 minutes.

본 발명의 실시예에 따른 차량용 씨. 브이. 조인트 케이지는 상기의 차량용 씨. 브이. 조인트 케이지를 제조방법에 의해 제조되는 것을 특징으로 한다.Car seed according to an embodiment of the present invention. V. The joint cage is the vehicle seed mentioned above. V. It is characterized in that the joint cage is manufactured by the manufacturing method.

삭제delete

이하, 본 발명에 따른 차량용 씨. 브이. 조인트 케이지 및 그의 제조방법에 대한 바람직한 실시예를 첨부한 도면을 참조하여 설명한다.Hereinafter, the vehicle seed according to the present invention. V. Preferred embodiments of the joint cage and its manufacturing method will be described with reference to the accompanying drawings.

도 3은 본 발명에 따른 차량용 씨. 브이. 조인트 케이지 제조용 침탄-오스펨퍼링법을 나타낸 도면이고, 도 4a 및 도 4b는 종래와 본 발명의 방법에 의해 제조된 차량용 씨. 브이. 조인트 케이지의 표면조직 비교사진이며, 도 5a 및 도 5b는 종래와 본 발명의 방법에 의해 제조된 차량용 씨. 브이. 조인트 케이지의 심부조직 비교사진이다.3 is a vehicle seed according to the present invention. V. Fig. 4A and 4B show a carburizing-osampering method for manufacturing a joint cage. V. 5A and 5B are vehicle seeds manufactured by the method of the related art and the present invention. V. A comparison of the deep tissue of a joint cage.

본 발명에서는 탄소 함량이 0.18 내지 0.22wt%로 되는 저탄소 Cr-Mo 합금강을 이용하여 인성 및 내구력이 향상된 차량용 씨. 브이. 조인트 케이지(4)를 제조하기 위해서, 도 3에 도시된 바와 같이, 탄소확산에 의한 강도 향상 효과를 유지하는 동시에 인성을 향상시킬 수 있는 침탄-오스템퍼링 열처리 방법을 이용하였다.In the present invention, a vehicle seed having improved toughness and durability by using a low carbon Cr-Mo alloy steel having a carbon content of 0.18 to 0.22 wt%. V. In order to manufacture the joint cage 4, as shown in Fig. 3, a carburizing-ostempering heat treatment method capable of maintaining toughness-improving effect by carbon diffusion and improving toughness was used.

본 발명에서 이용된 상기 침탄-오스템퍼링 열치리는, 900 내지 930℃에서 250 내지 300분 동안 침탄처리하는 단계와, 400 내지 450℃로 냉각시키는 단계와, 400 내지 450℃에서 30분 동안 유지하는 단계와, 850 내지 870℃에서 재가열하여 열처리하는 단계와, 염욕(salt bath) 처리조에서 230 내지 250℃까지 급랭시키는 단계와, 230 내지 250℃에서 15분 내지 30분동안 오스템퍼링 처리하는 단계로 이루어진다.The carburizing-ostempering heat treatment used in the present invention is a step of carburizing at 900 to 930 ° C. for 250 to 300 minutes, cooling to 400 to 450 ° C., and maintaining at 400 to 450 ° C. for 30 minutes. Reheating and heat treatment at 850 to 870 ° C., quenching to 230 to 250 ° C. in a salt bath treatment bath, and ostentering at 230 to 250 ° C. for 15 to 30 minutes. Is done.

상기와 같은 침탄-오스템퍼링 처리는 종래의 공정과 동일하지만 침탄처리 후 400℃까지 서냉하여 탄소확산 시간을 충분히 부여하면서 급냉에 의한 변형을 억제하고, 변태점 직상의 온도까지 재가열한 후 높은 온도의 염욕에 담구어 소정 시간동안 유지시킨다.The carburizing-ostempering treatment as described above is the same as the conventional process, but after cooling the carburizing process, it is cooled slowly to 400 ° C. to give sufficient carbon diffusion time while suppressing deformation due to quenching, and reheating to the temperature immediately above the transformation point, and then dyeing at high temperature. It is immersed in and maintained for a predetermined time.

따라서, 상기 케이지(4)를 침탄-오스템퍼링 처리할 경우에는 다음과 같은 미세조직을 통한 기계적 특성을 얻을 수 있었다. Therefore, when the cage 4 is carburized-ostempering, mechanical properties through the following microstructure could be obtained.

종래의 침탄 열처리 후에는 케이지 부품의 미세조직이 취약한 템퍼드 마르텐사이트 조직인데 반해, 상기와 같은 본 발명의 침탄-오스템퍼링 열처리인 경우에서는 표면이 인성이 뛰어난 하부 베이나이트 조직이 형성되고 심부는 강도가 뛰어난 템퍼드 마르텐사이트 조직이 형성되어 차량에서 이용되고자 하는 케이지(4)의 부품에서 요구하는 강도와 인성을 확보할 수 있게 되었다(도 4a와 도 4b, 및 도 5a와 도 5b 참조). The conventional carburizing heat treatment is a tempered martensite structure in which the microstructure of the cage parts is weak, whereas in the carburizing-ostempering heat treatment according to the present invention, a lower bainite structure having excellent toughness is formed on the surface, and the core portion has strength. An excellent tempered martensite structure was formed to ensure the strength and toughness required for the parts of the cage 4 to be used in the vehicle (see FIGS. 4A and 4B and FIGS. 5A and 5B).

상기와 같은 케이지(4)의 부품을 침탄-오스템퍼링 처리했을 경우 종래의 침탄 열처리 방법에서 보다 우수한 기계적 특성을 얻을 수 있음을 다음과 같은 실시예의 결과를 통해서 확실이 판명되었다.When the parts of the cage 4 are carburized-ostempering, it is clear from the results of the following examples that better mechanical properties can be obtained in the conventional carburized heat treatment method.

실시예Example

상술된 본 발명에 따른 침탄-오스템퍼링 열처리 방법을 이용하여 제조된 케이지(4) 부품의 기계적 특성(실시예)을 종래의 침탄 열처리 방법을 이용하여 제조된 것(비교예)과 비교한 실험 결과는 다음의 표 1과 같다.Experimental results comparing the mechanical properties (examples) of cage 4 parts manufactured using the carburizing-ostempering heat treatment method according to the present invention with those produced using a conventional carburizing heat treatment method (comparative example) Is shown in Table 1 below.

Figure 112005072572125-pat00001
Figure 112005072572125-pat00001

상기와 같은 표 1에 나타난 실험결과에 있어서, 본 발명의 실시예와 종래의 비교예는 케이지의 완제품의 열처리상태(표면경도, 경화깊이, 심부경도)가 거의 동등 수준을 보였다.In the results of the experiment shown in Table 1, the examples of the present invention and the conventional comparative example showed almost the same level of heat treatment (surface hardness, depth of cure, core depth) of the finished product of the cage.

그러나, 내경 변형량에 있어서는 본 발명의 실시예 부품의 열후 변형량이 비교예 보다 작았으며, 그 이유는 염욕냉각 및 유지에 의한 변태응력 저하 때문인 것으로 보인다.However, in the amount of internal diameter deformation, the amount of deformation after heat of the example component of the present invention was smaller than that of the comparative example, and it seems to be due to the transformation stress reduction caused by salt bath cooling and holding.

그리고, 본 발명의 실시예 제품과 종래 비교예 제품의 재질 및 열처리 상태가 동등함에도 불구하고 굽힘피로강도에 있어서 현격히 차이를 보이는 이유는 다음에 설멍될 도 4a와 도 4b, 및 도 5a와 도 5b에서 나타난 바와 같은 미세조직 변화에 의한 인성 차이 때문이다.And, although the material and the heat treatment state of the example product of the present invention and the conventional comparative example products are equivalent, the reason for the marked difference in bending fatigue strength is as follows: FIGS. 4A and 4B, and FIGS. 5A and 5B This is due to the difference in toughness caused by microstructural changes as shown in

따라서, 미세조직의 차이에 의하여 충격시험에서는 본 발명의 제품이 종래 존품 보다 인성및 내구성에서 월등히 향상된 결과를 나타내었다.Therefore, due to the difference in the microstructure, the impact test showed that the product of the present invention was much improved in toughness and durability than the existing products.

도 4a 및 도 4b는 실시예를 통한 본 발명의 제품과 종래 제품의 표면 미세조직의 비교사진이며, 도 5a 및 도 5b는 실시예를 통한 본 발명의 제품과 종래 제품의 심부 미세조직의 비교사진이다.4a and 4b is a comparison picture of the surface microstructure of the product of the present invention and the conventional product through the embodiment, Figure 5a and 5b is a comparison picture of the deep microstructure of the product of the present invention and the conventional product through the embodiment to be.

도 4a 및 도 4b의 사진을 통해서 알 수 있는 바와 같이, 표면 미세조직에 있어서, 종래 제품인 비교예는 템퍼드 마르텐사이트 조직이 관찰되었고, 본 발명의 실시예는 베이나이트와 잔류 오스테나이트의 혼합 조직이 관찰되었다.As can be seen through the photographs of Figures 4a and 4b, in the surface microstructure, the comparative example of the conventional product was observed the tempered martensite structure, the embodiment of the present invention is a mixed structure of bainite and residual austenite This was observed.

이를 통해서 알 수 있는 바와 같이 제품 표면에 있어서 본 발명의 제품에서 충격 인성이 크게 향상되었음을 보이고 있다.As can be seen from this, the impact toughness is greatly improved in the product of the present invention on the surface of the product.

도 5a 및 도 5b의 심부 미세조직 사진을 통해서 알 수 있는 바와 같이, 종래의 비교예는 저탄소 템퍼드 마르텐사이트 조직이 관찰되었고, 본 발명의 실시예는 저탄소 템퍼드 마르텐사이트와 베이나이트의 혼합 조직이 관찰되었다.As can be seen through the deep microstructure picture of Figure 5a and 5b, the conventional comparative example was observed a low carbon tempered martensite structure, the embodiment of the present invention is a mixed tissue of low carbon tempered martensite and bainite This was observed.

이를 통해서 알 수 있는 바와 같이 제품 심부에 있어서 본 발명의 제품에서 충격 인성이 크게 향상되었음을 보이고 있다.As can be seen from this, the impact toughness is greatly improved in the product of the present invention in the core of the product.

이상에서는 본 발명의 바람직한 실시예에 대하여 도시하고 또한 설명하였으나, 본 발명은 상기한 실시예에 한정되지 않으며, 특허청구범위에서 청구된 본 발명의 요지를 벗어남이 없이 당해 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고, 그와 같은 변경은 기재된 청구범위 내에 있게 된다.Although the above has been shown and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, in the technical field to which the present invention pertains without departing from the spirit of the invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes will fall within the scope of the claims set forth.

상기한 바와 같은 본 발명에 따른 침탄-오스템퍼링 열처리방법을 이용하여 차량용 씨. 브이. 조인트 케이지를 제조할 경우에는, 충격인성, 열변형량, 및 굽힘피로강도가 크게 향상된 차량용 씨. 브이. 조인트 케이지를 얻을 수 있다.Vehicle seed using the carburizing-ostempering heat treatment method according to the present invention as described above. V. In the case of manufacturing the joint cage, a vehicle seed having greatly improved impact toughness, thermal strain, and bending fatigue strength. V. A joint cage can be obtained.

Claims (3)

저탄소 Cr-Mo 합금강을 침탄-오스템퍼링하여 차량용 씨. 브이. 조인트 케이지를 제조하는 방법에 있어서, 상기 침탄-오스템퍼링은,Car seeds by carburizing-austempering low-carbon Cr-Mo alloy steel. V. In the method of manufacturing a joint cage, the carburizing-ostempering, 900 내지 930℃에서 250 내지 300분 동안 침탄처리하는 단계;Carburizing at 900 to 930 ° C. for 250 to 300 minutes; 400 내지 450℃로 서냉시키는 단계;Slow cooling to 400 to 450 ° C; 400 내지 450℃에서 30분 동안 유지하는 단계;Holding at 400 to 450 ° C. for 30 minutes; 850 내지 870℃에서 재가열하여 열처리하는 단계;Reheating and heat treatment at 850 to 870 ℃; 염욕(salt bath) 처리조에서 230 내지 250℃까지 급랭시키는 단계; 및Quenching to 230 to 250 ° C. in a salt bath treatment bath; And 230 내지 250℃에서 15분 내지 30분동안 오스템퍼링 처리하는 단계;를 포함하여 이루어진 것을 특징으로 하는 차량용 씨. 브이. 조인트 케이지 제조방법.A car seed, comprising: austempering at 230 to 250 ° C. for 15 to 30 minutes. V. How to make a joint cage. 삭제delete 제1항 또는 제2항에 의해서 제조되는 것을 특징으로 하는 차량용 씨. 브이. 조인트 케이지.A seed for a vehicle, which is prepared according to claim 1. V. Joint cage.
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KR101719560B1 (en) * 2017-01-16 2017-04-05 케이제이에프 주식회사 Heat treatment method for surface hardened alloy steel
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