CN106141576B - 一种轿车发动机用耐高温排气门 - Google Patents
一种轿车发动机用耐高温排气门 Download PDFInfo
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- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
Abstract
一种轿车发动机用耐高温排气门,其特征在于:采取熔炼铸造,锻造头部,调质热处理,切削加工,碳氮共渗热处理,锥面磨削加工,锥面堆焊,表面打磨,涂覆涂层的工艺步骤,本发明铁基合金材料可以充分满足气门主体材料的强度要求;对气门进行碳氮共渗热处理提高排气门的硬度及强度,避免出现腐蚀点。
Description
技术领域
本发明涉一种轿车发动机用耐高温排气门,属于汽车发动机配件技术领域。
背景技术
气门是发动机的精密零件,用于封锁气流通道,控制内燃机的气体交换,工作时需承受较高的机械负荷和热负荷,同时还承受落座冲击负荷及燃气压力所给予的静负荷,现有的汽车发动机气门多采用金属或合金材料制成,当温度较高时易膨胀,而且气门使用一段时间后磨损严重,使用寿命短,如何创设一种坚固耐用、热胀冷缩系数小,使用寿命长,耐高温,耐摩擦的新的新型发动机气门,使汽车轻量化,最终实现绿色新型能源汽车产业化,成为业界急需改进的目标。
发明内容
一种轿车发动机用耐高温排气门,其特征在于:采取熔炼铸造,锻造头部,调质热处理,切削加工,碳氮共渗热处理,锥面磨削加工,锥面堆焊,表面打磨,涂覆涂层的工艺步骤,其中:
具体步骤为:
按照排气门主体材料元素组分进行熔炼,后进行铸造,得到坯料,排气门主体材料为:C 0.2%,Si 3.7%,Mo 2.5%,W 1.5%,Mn 0.9%,P≤0.035%,S≤0.035%,Ti 2.5%,Cr12.5%, Ni 3%,Co 1.1%,V 0.45%,余量为Fe及不可避免的杂质;
将坯料采用电热镦锻造,终锻温度为900℃,锻造变形量控制在65%-85%,镦粗速度为10mm/s;
锻造后进行多级调质热处理工艺:在1060℃保温10s后水淬,470℃回火;然后990℃保温10s后油淬,435℃回火;最后960℃保温10s后油淬,390℃回火;
热处理后进行对工件切削加工,
切削加工后对工件表面进行碳氮共渗热处理,强渗过程:温度950-980℃范围,碳势和氮势采取四级步骤,碳势0.4-0.6%,氮势1.2-1.4%,保温3h,然后升高碳势至0.7-0.9%,降低氮势至1.0-1.1%,保温2h,再升高碳势至1.0-1.1%,降低氮势至0.7-0.9%,保温2h,最后升高碳势至1.2-1.6%,降低氮势至0.4-0.5%,保温2.5h;强渗后进行扩散,扩散过程:控制炉温度降至900-920℃,保温3h,降温至820-850℃,保温4h,扩散过程碳势控制在1.2~1.3%之间,氮势控制在1.0~1.1%之间;空冷至室温;扩散后进行淬火,淬火过程:在850℃进行油淬,油温控制在75℃;清洗过程:去除零部件表面油渍,清洗液温度控制在55℃;回火:进行低温回火,控制炉温度190℃,时间150-200分钟,
对工件锥面磨削加工,
锥面磨削加工后对工件进行锥面堆焊,锥面堆焊工艺为:150-200℃预热,非转移弧电压20V,非转移弧电流50A;喷嘴与工件表面的距离10-12mm,焊接完成后缓慢冷却;堆焊层材料为:Co 33%,Mo 4.5%,Cr 1.5%,Ni 0.8%, B 0.25%,Ta 0.4%,Sn 0.55%,Gd 0.2%,C0.1%,余量为W;
对工件表面打磨
工件表面打磨后对工件表面涂覆碳化钛涂层,涂层厚度约11微米;之后在碳化钛涂层外涂覆氮化钛涂层,涂层厚度约5微米,得到排气门。
上述发明内容相对于现有技术的有益效果在于:1)本发明铁基合金材料可以充分满足气门主体材料的强度要求;2)对气门进行碳氮共渗热处理提高排气门的硬度及强度,避免出现腐蚀点; 3)通过堆焊处理使得气门锥面达到更高的耐磨性和耐冲击,相应的疲劳性能也得到提高;4)通过对发动机气门涂覆涂层,提高材料的防腐、耐高温、耐磨性能。
具体实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解,现详细说明本发明的具体实施方式。
实施例1
一种轿车发动机用耐高温排气门,其特征在于:采取熔炼铸造,锻造头部,调质热处理,切削加工,碳氮共渗热处理,锥面磨削加工,锥面堆焊,表面打磨,涂覆涂层的工艺步骤,其中:
具体步骤为:
按照排气门主体材料元素组分进行熔炼,后进行铸造,得到坯料,排气门主体材料为:C 0.2%,Si 3.7%,Mo 2.5%,W 1.5%,Mn 0.9%,P≤0.035%,S≤0.035%,Ti 2.5%,Cr12.5%, Ni 3%,Co 1.1%,V 0.45%,余量为Fe及不可避免的杂质;
将坯料采用电热镦锻造,终锻温度为900℃,锻造变形量控制在65%-85%,镦粗速度为10mm/s;
锻造后进行多级调质热处理工艺:在1060℃保温10s后水淬,470℃回火;然后990℃保温10s后油淬,435℃回火;最后960℃保温10s后油淬,390℃回火;
热处理后进行对工件切削加工,
切削加工后对工件表面进行碳氮共渗热处理,强渗过程:温度950-980℃范围,碳势和氮势采取四级步骤,碳势0.4-0.6%,氮势1.2-1.4%,保温3h,然后升高碳势至0.7-0.9%,降低氮势至1.0-1.1%,保温2h,再升高碳势至1.0-1.1%,降低氮势至0.7-0.9%,保温2h,最后升高碳势至1.2-1.6%,降低氮势至0.4-0.5%,保温2.5h;强渗后进行扩散,扩散过程:控制炉温度降至900-920℃,保温3h,降温至820-850℃,保温4h,扩散过程碳势控制在1.2~1.3%之间,氮势控制在1.0~1.1%之间;空冷至室温;扩散后进行淬火,淬火过程:在850℃进行油淬,油温控制在75℃;清洗过程:去除零部件表面油渍,清洗液温度控制在55℃;回火:进行低温回火,控制炉温度190℃,时间150-200分钟,
对工件锥面磨削加工,
锥面磨削加工后对工件进行锥面堆焊,锥面堆焊工艺为:150-200℃预热,非转移弧电压20V,非转移弧电流50A;喷嘴与工件表面的距离10-12mm,焊接完成后缓慢冷却;堆焊层材料为:Co 33%,Mo 4.5%,Cr 1.5%,Ni 0.8%, B 0.25%,Ta 0.4%,Sn 0.55%,Gd 0.2%,C0.1%,余量为W;
对工件表面打磨
工件表面打磨后对工件表面涂覆碳化钛涂层,涂层厚度约11微米;之后在碳化钛涂层外涂覆氮化钛涂层,涂层厚度约5微米,得到排气门。
Claims (1)
1.一种轿车发动机用耐高温排气门,其特征在于:采取熔炼铸造,锻造头部,调质热处理,切削加工,碳氮共渗热处理,锥面磨削加工,锥面堆焊,表面打磨,涂覆涂层的工艺步骤,其中:
具体步骤为:
按照排气门主体材料元素组分进行熔炼,后进行铸造,得到坯料,排气门主体材料为:C0.2%,Si 3.7%,Mo 2.5%,W 1.5%,Mn 0.9%,P≤0.035%,S≤0.035%,Ti 2.5%,Cr 12.5%, Ni3%,Co 1.1%,V 0.45%,余量为Fe及不可避免的杂质;
将坯料采用电热镦锻造,终锻温度为900℃,锻造变形量控制在65%-85%,镦粗速度为10mm/s;
锻造后进行多级调质热处理工艺:在1060℃保温10s后水淬,470℃回火;然后990℃保温10s后油淬,435℃回火;最后960℃保温10s后油淬,390℃回火;
热处理后进行对工件切削加工,
切削加工后对工件表面进行碳氮共渗热处理,强渗过程:温度950-980℃范围,碳势和氮势采取四级步骤,碳势0.4-0.6%,氮势1.2-1.4%,保温3h,然后升高碳势至0.7-0.9%,降低氮势至1.0-1.1%,保温2h,再升高碳势至1.0-1.1%,降低氮势至0.7-0.9%,保温2h,最后升高碳势至1.2-1.6%,降低氮势至0.4-0.5%,保温2.5h;强渗后进行扩散,扩散过程:控制炉温度降至900-920℃,保温3h,降温至820-850℃,保温4h,扩散过程碳势控制在1.2~1.3%之间,氮势控制在1.0~1.1%之间;空冷至室温;扩散后进行淬火,淬火过程:在850℃进行油淬,油温控制在75℃;清洗过程:去除零部件表面油渍,清洗液温度控制在55℃;回火:进行低温回火,控制炉温度190℃,时间150-200分钟,
对工件锥面磨削加工,
锥面磨削加工后对工件进行锥面堆焊,锥面堆焊工艺为:150-200℃预热,非转移弧电压20V,非转移弧电流50A;喷嘴与工件表面的距离10-12mm,焊接完成后缓慢冷却;堆焊层材料为:Co 33%,Mo 4.5%,Cr 1.5%,Ni 0.8%, B 0.25%,Ta 0.4%,Sn 0.55%,Gd 0.2%,C 0.1%,余量为W;
对工件表面打磨,
工件表面打磨后对工件表面涂覆碳化钛涂层,涂层厚度11微米;之后在碳化钛涂层外涂覆氮化钛涂层,涂层厚度5微米,得到排气门。
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CN110552752A (zh) * | 2019-09-11 | 2019-12-10 | 瑞安市大顺气门有限公司 | 一种强化发动机气门及其制备工艺 |
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CN112301286A (zh) * | 2020-11-03 | 2021-02-02 | 安福锦湖(湖南)气门有限公司 | 一种汽车发动机排气门材料及其制备方法 |
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