KR20040011234A - Manufacturing method of transfer drive gear and driven gear for transmission - Google Patents

Manufacturing method of transfer drive gear and driven gear for transmission Download PDF

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KR20040011234A
KR20040011234A KR1020020044759A KR20020044759A KR20040011234A KR 20040011234 A KR20040011234 A KR 20040011234A KR 1020020044759 A KR1020020044759 A KR 1020020044759A KR 20020044759 A KR20020044759 A KR 20020044759A KR 20040011234 A KR20040011234 A KR 20040011234A
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driven gear
workpiece
manufacturing
transfer drive
gear
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KR1020020044759A
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Korean (ko)
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반형오
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현대자동차주식회사
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Publication of KR20040011234A publication Critical patent/KR20040011234A/en

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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
    • C23C8/28—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
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/10—Surface characteristics; Details related to material surfaces

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE: A method for manufacturing transfer drive and driven gears for automatic transmission is provided to reduce noise and greatly improve contact fatigue strength by applying carbonitriding process instead of existing carburizing heat treatment process. CONSTITUTION: The method comprises the steps of forging a workpiece; heat treating the workpiece at a temperature of 750 to 800 deg.C for 20 to 30 min while introducing NH3 gas having a concentration of 2 to 2.5% based on the atmospheric pressure into heat treatment furnace; maintaining the workpiece at a temperature of 900 to 950 deg.C for 300 min so that the workpiece is maintained to a viscosity level of 0.7 to 0.9 centipoise; and maintaining the workpiece at a temperature of 800 to 850 deg.C for 20 to 30 min while introducing NH3 gas having a concentration of 2 to 2.5% based on the atmospheric pressure into the heat treatment furnace.

Description

자동 변속기용 트랜스퍼 드라이브 및 드리븐 기어의 제조 방법{Manufacturing method of transfer drive gear and driven gear for transmission}Manufacturing method of transfer drive gear and driven gear for transmission

본 발명은 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 제조 방법에 관한 것으로서, 더욱 상세하게는 탄소함량 0.18-0.22 wt% 의 Cr 합금강을 사용하여 열간단조, Normalizing, 가공, 침탄열처리, 연삭하는 단계등으로 이루어지는 자동변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어를 제조하는 방법에 관한 것이다.The present invention relates to a method of manufacturing a transfer drive gear and a transfer driven gear for an automatic transmission, and more particularly, using a carbon alloy of 0.18-0.22 wt% Cr alloy steel, forging, normalizing, processing, carburizing heat treatment and grinding. The present invention relates to a method for manufacturing a transfer drive gear and a transfer driven gear for an automatic transmission.

통상적으로 자동변속기에는 다수의 기어가 조합되어 있는데, 그 중에서 트랜스퍼 드라이버 기어와 드리븐 기어는 동력을 전달을 위한 주된 기어류로서, 그 장착위치는 첨부한 도 4에 도시된 바와 같다.Typically, a plurality of gears are combined in an automatic transmission, among which a transfer driver gear and a driven gear are the main gears for transmitting power, and the mounting positions thereof are as shown in FIG. 4.

자동변속기 기어중 트랜스퍼 드라이브기어는 토크 컨버터(Torque converter)를 통하여 들어오는 엔진 출력을 트랜스퍼 드리븐 기어를 경유하여 구동축으로 보내주는 역할을 하는 기어로 상기 두 기어간의 마찰 소음이 현재 자동변속기 소음발생의 주원인이며, 엔진출력상승으로 인하여 기어표면의 핏팅(pitting)발생으로 인한 품질문제가 빈번히 발생하고 있다.Among the automatic transmission gears, the transfer drive gear is a gear that sends the engine output through the torque converter to the drive shaft via the transfer driven gear. Friction noise between the two gears is the main cause of the noise of the automatic transmission. As a result, the quality problems due to the pitting of the gear surface are frequently caused by the increase in engine power.

상기 소음 및 핏팅(pitting)발생 문제는 주로 두 기어의 기능 및 형상에 좌우되는데, 형상을 바꿀 경우 관련부품들의 형상을 모두 변경해야 하고, 또 관련부품들과의 최적 조립성(Matching)을 확립하는 일이 설계나 가공기술측면에서 난해하고 현실적으로 어려움이 있다.The noise and pitting occurrence problems are mainly dependent on the function and shape of the two gears. When the shape is changed, the shape of all the related parts must be changed, and the optimum matching with the related parts is established. Work is difficult and realistically difficult in terms of design and processing technology.

보다 상세하게는, 기존의 트랜스퍼 드라이버 및 드리븐 기어의 제조 방법은 소재를 단조 및 가공한 후, 침탄처리 공정을 진행하여 제조되고 있는 바, 상기 침탄 처리공정은 CP 0.7-0.9 수준으로 900℃에서 300분간 유지시키는 동시에 850℃에서 20분간 유지시킨 후 유냉시키는 단계로 진행되는 일반적인 표면경화처리 공정으로서, CP 0.7-0.9 수준으로 부품 표면을 탄소 확산에 의해서 경화시키는 방법에 의거 대기중 평형상태로 존재하는 CO2, H2O, O2가스의 영향과 재질내에 존재하는 Cr,Si,Mn등의 합금원소의 결합에 의하여 핏팅 발생의 원인이 되는 입계산화층 및 비소입층 발생을 피할 수 없으며, 잔류 오스테나이트(austenite)량도 10-15%수준으로 변속기 구동시 치합상태의 불균일로 인하여 소음발생이 유발되는 단점이 있다.More specifically, the conventional method of manufacturing a transfer driver and driven gear is produced by forging and processing a material, followed by a carburizing process, and the carburizing process is performed at 900 ° C. at 300 ° C. at a 0.7-0.9 CP level. It is a general surface hardening process that proceeds to hold for 20 minutes at 850 ° C for 20 minutes, followed by oil-cooling. Due to the influence of CO 2 , H 2 O, O 2 gas and the combination of alloying elements such as Cr, Si, and Mn in the material, generation of grain boundary oxide layer and non-quenching layer, which causes the occurrence of fitting, is inevitable and residual austenite The amount of austenite is also 10-15%, which causes noise to be generated due to unevenness of the engagement state when the transmission is driven.

따라서, 본 발명은 상기와 같은 점을 감안하여 발명한 것으로서, 소음저감 및 접촉피로강도의 향상을 위하여 트랜스퍼 드라이브기어 및 드리븐기어의 제조공정중 기존의 침탄열처리공정 대신에 침탄침질공정을 개발하여 적용시킴으로써, 소음저감 및 접촉피로강도를 크게 향상시킬 수 있도록 한 트랜스퍼 드라이브 및 드리븐 기어의 제조 방법을 제공하는데 그 목적이 있다.Therefore, the present invention has been invented in view of the above, and developed and applied to the carburizing and sedimentation process instead of the conventional carburizing heat treatment process in the manufacturing process of the transfer drive gear and driven gear to reduce noise and improve the contact fatigue strength. It is an object of the present invention to provide a method for manufacturing a transfer drive and driven gear, which can greatly improve noise reduction and contact fatigue strength.

이러한 목적을 달성하기 위한 본 발명은 트랜스퍼 드라이브 및 드리븐 기어의 제조 방법에 있어서, 소재를 단조 및 가공한 후, 750-800℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계, CP 0.7-0.9 수준으로 900-950℃에서 300분간 유지시키는 단계, 800-850℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계를 포함하는 침탄침질 공정을 진행하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a method for manufacturing a transfer drive and driven gear, and forging and processing a material, and then maintaining NH 3 gas at an atmosphere reference level of 2-2.5% at 20-30 minutes at 750-800 ° C. Concentration step, maintaining the CP 0.7-0.9 level at 900-950 ℃ 300 minutes, maintaining 20-30 minutes at 800-850 ℃ while adding NH 3 gas at a concentration of 2-2.5% of the atmospheric standard It characterized in that the carburizing process comprising a carburizing.

도 1은 본 발명에 따른 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 제조 방법을 설명하는 그래프,1 is a graph illustrating a manufacturing method of a transfer drive gear and a transfer driven gear for an automatic transmission according to the present invention;

도 2는 본 발명에 따른 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 소음 측정 결과를 나타내는 그래프,Figure 2 is a graph showing the noise measurement results of the transfer drive gear and transfer driven gear for an automatic transmission according to the present invention,

도 3은 기존의 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 제조 방법을 설명하는 그래프,3 is a graph illustrating a manufacturing method of a conventional transfer drive gear and transfer driven gear for an automatic transmission;

도 4는 본 발명에 따른 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 장착 위치를 보여주는 개략도.Figure 4 is a schematic diagram showing the mounting position of the transfer drive gear and the transfer driven gear for the automatic transmission according to the invention.

이하, 본 발명을 첨부도면을 참조로 보다 상세하게 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

본 발명은 기존의 침탄열처리공정 대신에 침탄침질공정을 적용시킴으로써, 소음저감 및 접촉피로강도를 크게 향상시킬 수 있도록 한 것이다.The present invention is to improve the noise reduction and the contact fatigue strength by applying the carburizing process in place of the existing carburizing heat treatment process.

통상 자동변속기용 트랜스퍼 드라이브 및 드리븐기어의 제조방법은 소재를 절단하여 단조작업을 하고, 단조된 제품을 기계가공을 하는 단계를 포함하는 바, 기계가공 단계후 본 발명의 침탄침질 공정을 진행시키게 된다.In general, a method of manufacturing a transfer drive and a driven gear for an automatic transmission includes a step of cutting a forged material and machining a forged product, and then proceeding the carburization and sedimentation process of the present invention after the machining step. .

본 발명의 침탄침질 공정은 먼저 750-800℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계를 진행하고, 다음으로 CP 0.7-0.9 수준으로 900-950℃에서 300분간 유지시키는 단계를 진행하며, 다음으로 800-850℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계로 이루어진다.In the carburizing process of the present invention, the process of firstly maintaining 20-30 minutes at 750-800 ° C. and adding NH 3 gas at a concentration of 2-2.5% based on the atmosphere, and then 900-950 to CP 0.7-0.9 level The step of maintaining at 300 ℃ proceeds, followed by 20-30 minutes at 800-850 ℃ while the NH 3 gas at the concentration of 2-2.5% of the atmospheric reference.

이때, 최초 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계에서 제품을 750-800℃ 에서 20-30분 유지시키는 이유는 질소의 고용을 극대화시키기 위함이다.In this case, the reason why the product is maintained at 750-800 ° C. for 20-30 minutes in the step of introducing the first NH 3 gas at a concentration of 2-2.5% of the atmospheric standard is to maximize the employment of nitrogen.

또한, 소입존(800-850℃)에서의 다시 질소가스를 투입하는 이유는 제품내의 잔류 오스테나이트를 생성시키고자 한 것이다.In addition, the reason for introducing nitrogen gas in the quench zone (800-850 ° C.) is to produce residual austenite in the product.

이와 같은 본 발명의 침탄침질공정에서 NH3가스의 역할 및 특성은 다음과 같다.The role and characteristics of the NH 3 gas in the carburizing and sedimentation process of the present invention are as follows.

먼저, 소음저감 역할로서, 잔류 오스테나이트량을 표면에서부터 0.1-0.15mm 까지 생성시켜, 고면압상태에서 응력집중 발생시 초기 마모(wear)를 약간 동반하면서 치접촉면을 확산시켜 응력분산효과를 유도하고, 최적 조립성(matching) 형태로 발전하면서 소음을 저감시킬 수 있게 된다.First, as a noise reduction role, the amount of retained austenite is produced from the surface to 0.1-0.15mm, and the stress contact effect is induced by spreading the tooth contact surface with a slight initial wear when stress concentration occurs at high surface pressure. It is possible to reduce noise while developing in the form of optimum matching.

또한, 접촉피로강도 향상 역할로서, 비소입층의 존재를 질소의 C 당량 효과 (12/14ㆍN)에 의하여 상쇄 시킴으로써, 표면이상층의 분포를 억제하는 효과가 있으며, 궁극적으로 핏팅(Pitting)발생부의 기점부를 줄임으로써, 접촉피로강도를 향상시키게 된다.In addition, as a role of improving the contact fatigue strength, the presence of the non-quenched layer is canceled by the C equivalent effect of nitrogen (12/14 · N), thereby suppressing the distribution of the superficial layer, and ultimately, pitting occurs. By reducing the negative starting point, the contact fatigue strength is improved.

즉, 질소는 탄소보다 뛰어난 소입성 향상 원소이므로 침질공정에서 일정량의 질소를 침투시키면 900도에서 침탄시 탄소를 상대 당량만큼 덜 투입시켜도 되므로 결과적으로 탄소에 의한 입계산화층을 억제하고 침탄소원소(Mn,Vr,Mo등)의 탄소화의 결합을 억제하여 비소입층을 개선시키게 되는 것이다.In other words, nitrogen is an element that improves quenchability better than carbon, so if a certain amount of nitrogen is penetrated in the sedimentation process, carbon may be injected as much as a relative equivalent amount when carburizing at 900 ° C. (Vr, Mo, etc.) to suppress the carbonization bond to improve the non-quenching layer.

이하, 본 발명의 바람직한 실시예를 상세히 설명하면 다음과 같고, 하기 실시예는 본 발명을 예시하는 것일 뿐, 본 발명의 내용이 하기 실시예에 한정되는 것은 아니다.Hereinafter, preferred embodiments of the present invention will be described in detail as follows, and the following examples are merely to illustrate the present invention, and the content of the present invention is not limited to the following examples.

실시예Example

소재의 단조 및 가공후, 본 발명의 침탄침질 공정을 진행하여 트랜스퍼 드라이버 및 드리븐 기어를 제조하였다.After the forging and processing of the material, the carburizing process of the present invention was carried out to manufacture a transfer driver and driven gear.

비교예Comparative example

소재의 단조 및 가공후, 기존의 침탄 공정을 진행하여 트랜스퍼 드라이버 및드리븐 기어를 제조하였다.After the forging and processing of the material, a conventional carburizing process was performed to manufacture a transfer driver and a driven gear.

시험예1Test Example 1

상기 실시예와 비교예로 제조된 각 기어에 대한 물성치와 잔류오스테나이트량 및 입계산화층 깊이등을 측정하였는 바, 그 결과는 다음의 표 1과 같다.The physical properties, residual austenite content, and grain boundary layer depth for each gear manufactured according to the examples and the comparative example were measured. The results are shown in Table 1 below.

위의 표 1에서 보는 바와 같이, 본 발명의 방법에 의하여 제조된 기어는 종래의 방법에 의하여 제조된 기어 대비 입계산화층 깊이가 50% 저감되었고, 잔류 오스테나이트량은 3배 정도 증가하였다.As shown in Table 1 above, the gear manufactured by the method of the present invention has a 50% reduction in the depth of the grain boundary layer compared to the gear manufactured by the conventional method, and the amount of retained austenite is increased by three times.

또한, 표면경도의 경우 고면압상태에서는 치표면에 존재하는 잔류 오스테나이트 조직이 고면압의 스트레스(stress)에 의한 가공변태에 의하여 마르텐사이트(Martensite)화 되므로 주행중 경도저하는 발생하지 않고, 계속적인 경도보상이 이루어진다.In the case of surface hardness, the residual austenite structure existing on the tooth surface is martensite due to the processing deformation caused by the stress of the high surface pressure, so that the hardness decreases while driving. Hardness compensation is made.

시험예2Test Example 2

상기 실시예와 비교예에 따른 각 기어류의 시편을 제작하여 다음의 시험조건으로 접촉피로강도 테스트를 하였다.The specimens of the gears according to the examples and the comparative examples were prepared and subjected to the contact fatigue strength test under the following test conditions.

- 시험하중 : 330 kgf/㎟-Test load: 330 kgf / ㎡

- 슬립비율(slip ratio) : 40%Slip ratio: 40%

- 오일 온도 : 50℃이상-Oil temperature: above 50 ℃

- 시험기 : 코마쯔 피로시험기-Tester: Komatsu Fatigue Tester

위와 같은 조건으로 실시예 및 비교예에 따른 시험편의 접촉피로강도 시험의 결과는 다음의 표 2와 같이, 본 발명의 실시예에 따른 시험편의 접촉피로강도가 기존의 비교예보다 크게 향상되었음을 알 수 있었다.As a result of the contact fatigue strength test of the test piece according to the Examples and Comparative Examples under the same conditions as shown in Table 2, it can be seen that the contact fatigue strength of the test piece according to the embodiment of the present invention significantly improved than the conventional comparative example there was.

시험예3Test Example 3

본 발명의 방법으로 제작된 기어류의 잔류 오스테나이트량 증가로 소음저감효과를 측정하였는 바, 실제품 제작후 변속기에 조립하여 다이나모 실험장비를 이용하여 소음 테스트를 실시하였는 바, 그 결과는 도 3에 도시한 바와 같다.The noise reduction effect was measured by increasing the amount of retained austenite in the gears manufactured by the method of the present invention. After the production of the actual product, the noise was tested by using a dynamo test equipment after assembling the transmission. As shown.

본 발명재(침탄침질 대 침탄침질의 조합) 즉, 드라이브 및 드리븐 기어를 모두 본 발명의 침탄침질로 열처리함에 따라, 기존의 비교재들보다 5DB정도 소음이 저감되었음을 알 수 있었다.As the present invention (the combination of carburizing and carburizing), that is, both the drive and the driven gear were heat treated with the carburizing of the present invention, it was found that the noise was reduced by about 5 DB compared with the conventional comparative materials.

이상에서 본 바와 같이, 본 발명에 따른 자동 변속기용 트랜스퍼 드라이브 기어 및 트랜스퍼 드리븐 기어의 제조 방법에 의하면, 본 발명의 방법에 의하여 제조된 기어류는 종래의 것보다 접촉피로강도를 크게 향상시킬 수 있고, 소음을 저감시킬 수 있는 장점이 있다.As described above, according to the manufacturing method of the transfer drive gear and the transfer driven gear for the automatic transmission according to the present invention, the gears produced by the method of the present invention can greatly improve the contact fatigue strength than the conventional one This has the advantage of reducing noise.

Claims (1)

트랜스퍼 드라이브 및 드리븐 기어의 제조 방법에 있어서,In the manufacturing method of the transfer drive and driven gear, 소재를 단조 및 가공한 후, 750-800℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계;After forging and processing the material, while maintaining 20-30 minutes at 750-800 ° C., while introducing NH 3 gas at a concentration of 2-2.5% of atmospheric standard; CP 0.7-0.9 수준으로 900-950℃에서 300분간 유지시키는 단계;Maintaining at a level of CP 0.7-0.9 at 900-950 ° C. for 300 minutes; 800-850℃ 에서 20-30분 유지시키는 동시에 NH3가스를 대기 기준 2-2.5% 농도로 투입시키는 단계를 포함하는 침탄침질 공정을 진행하여 이루어지는 것을 특징으로 하는 자동 변속기용 트랜스퍼 드라이브 및 드리븐 기어의 제조 방법.The transfer drive and driven gear of the automatic transmission, characterized in that the carburizing process comprising the step of maintaining 20-30 minutes at 800-850 ℃ and injecting NH 3 gas at a concentration of 2-2.5% of the atmospheric standard Manufacturing method.
KR1020020044759A 2002-07-29 2002-07-29 Manufacturing method of transfer drive gear and driven gear for transmission KR20040011234A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101100823B1 (en) * 2011-06-08 2012-01-02 최갑숙 Material for teaching mathematics

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63213652A (en) * 1987-02-27 1988-09-06 Musashi Seimitsu Ind Co Ltd Method for carbonitriding gear
US5019182A (en) * 1988-09-27 1991-05-28 Mazda Motor Corporation Method of forming hard steels by case hardening, shot-peening and aging without tempering
JPH0754050A (en) * 1993-08-11 1995-02-28 Kobe Steel Ltd High strength gear excellent in root of tooth bending fatigue strength and tooth surface pitching resistance and manufacture therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63213652A (en) * 1987-02-27 1988-09-06 Musashi Seimitsu Ind Co Ltd Method for carbonitriding gear
US5019182A (en) * 1988-09-27 1991-05-28 Mazda Motor Corporation Method of forming hard steels by case hardening, shot-peening and aging without tempering
JPH0754050A (en) * 1993-08-11 1995-02-28 Kobe Steel Ltd High strength gear excellent in root of tooth bending fatigue strength and tooth surface pitching resistance and manufacture therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101100823B1 (en) * 2011-06-08 2012-01-02 최갑숙 Material for teaching mathematics

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