CN106244928A - 利用铁模喷砂工艺铸造螺母连接件及其制备方法 - Google Patents
利用铁模喷砂工艺铸造螺母连接件及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种利用铁模喷砂工艺铸造螺母连接件,其特征在于,包括以下重量份组分:碳0.26‑0.34、锰0.17‑0.25、钋0.05‑0.14、铝2.15‑3.25、钼0.03‑0.05、镁2.4‑2.7、镍0.073‑0.14、碲0.032‑0.045、硼0.07‑0.08、精炼调渣剂20‑25、适量氮气、余量Fe和不可避免的杂质;所述精炼调渣剂由以下重量份原料组成:铝矾土20‑45、大理石15‑25、石英砂19‑44、钡5‑10、活性石灰10‑11、氟石膏9‑10、硅微粉4‑8、电熔镁粉6‑7、钠长石5‑10、铝丸2‑5。本发明采用铁模喷砂工艺结合顶部吹氧气和二氧化碳混合气体的技术,提高螺母整体机械性能。
Description
技术领域
本发明涉及机械零件加工领域,尤其涉及一种利用铁模喷砂工艺铸造螺母连接件及其制备方法。
背景技术
螺母就是螺帽,与螺栓或螺杆拧在一起用来起紧固作用的零件,所有生产制造机械必须用的一种元件根据材质的不同,分为碳钢、不锈钢、有色金属(如铜)等几大类型。例如:自锁螺母、防松螺母、锁紧螺母、四爪螺母、螺母、螺母、旋入螺母保险螺母、细杆螺钉连接螺母自锁六角盖形螺母、专用地脚螺钉用螺母、六角冕形薄螺母、吊环螺母。嵌入式滚花铜螺母主要的作业方式是注塑,加热后嵌入到塑料件里面或是直接模具注塑,如果采用模具注塑,PA/NYLOY/PET的熔点都在200°C以上,嵌入螺母被热熔进塑件后温度迅速变高,注塑成型后,塑料体迅速冷却结晶变硬,如果嵌入螺母温度还处在高温,那就有可能倒至铜螺母与塑料件接触的地方开始松脱或出现裂缝。所以在嵌入螺母的注塑中都使用铜材质的螺母而不是碳钢螺母。
螺母的强度与使用寿命与螺栓的铸造材料,以及铸造材料中的各种微量合金元素的数量有的密不可分的关系,传统的螺栓所采用的钢材料存在合金元素的组成成分杂乱,不能起到应有的效果,且传统的炼钢方法也存在缺陷,导致钢水中的杂质难以去除,影响螺母的多方面机械性能,尤其是钢水精炼调渣剂的使用方法不当,中国专利钢水精炼调渣剂:申请号:00107235.8的专利文件中指出了一种钢水精炼调渣剂,它含有(重量%):CaO20~45%,Al2O320~45%,金属Al、Si、Ca、Ba、Re中的一种或几种5~15%,CaF24~6%,SiO2≤10%,MgO≤10%。该精炼调渣剂可具有预熔固溶体的结构。用该精炼调渣剂处理过的钢水含有很低的硫、氧和夹杂物,但是文件中的精炼调渣剂存在成分种类少,且制备方法简单,难以达到理想的效果,且方法单一,并没有指出与其他加工方法互相结合的方案,同时也没有指出其后续的机械铸造和加工工艺的完整配套技术方案,本文结合现有技术,给出提高螺母整体机械性能的完整加工工艺。
发明内容
本发明目的就是为了弥补已有技术的缺陷,提供一中采用铁模喷砂工艺结合顶部吹氧气和二氧化碳混合气体的技术,提高螺母整体机械性能的利用铁模喷砂工艺铸造螺母连接件及其制备方法。
本发明是通过以下技术方案实现的:
一种利用铁模喷砂工艺铸造螺母连接件,其特征在于,包括以下重量份组分:碳0.26-0.34、锰0.17-0.25、钋0.05-0.14、铝2.15-3.25、钼0.03-0.05、镁2.4-2.7、镍0.073-0.14、碲0.032-0.045、硼0.07-0.08、精炼调渣剂20-25、适量氮气、余量Fe和不可避免的杂质;所述精炼调渣剂由以下重量份原料组成:铝矾土20-45、大理石15-25、石英砂19-44、钡5-10、活性石灰10-11、氟石膏9-10、硅微粉4-8、电熔镁粉6-7、钠长石5-10、铝丸2-5;所述精炼调渣剂的制备方法为:将铝矾土、大理石、硅微粉、电熔镁粉、石英砂、钡、活性石灰、氟石膏、钠长石、铝丸加适量的水混合,再制成球状,然后放入竖炉中用焦炭作燃料预熔,预熔温度为1400-1500℃,再搅拌均匀,液态渣再经过液氮快速冷却,再放入球磨机中研磨成粉末状即得。
所述利用铁模喷砂工艺铸造螺母连接件的制备方法,其特征在于,包括以下步骤:
(1)将按重量计的原料碳、锰、铌、铅、钼、镁、镍、钨、锡和铁放入预热炉,将熔炼原料预热至250℃-350℃后放入感应炉中进行熔炼,控制温度在1500-1600℃,在依次铝质还原剂、钙质冶金辅料,再用惰性物氮气封炉口;
(2) 将液态二氧化碳气瓶中的二氧化碳通过汇流排输送到低温液体汽化器中,再放入缓冲储气罐中,备用,在熔化过程中向炉池内吹入氧气和二氧化碳的混合气体,且同时进行2-5次炉底搅拌,熔体经搅拌均匀后立即取样,进行炉前分析,取样温度不得低于1400℃,根据取样分析的结果,进行脱硫、脱氧,再加入部分精炼调渣剂进行一次精炼、后间隔30-35分钟后再进行添加剩余精炼调渣剂进行二次精炼,获得钢水;
(3)将铁模放入芯子窑中加热,然后逐一进行造型,控制温度在200-230℃,利用低压0.4-0.5MPa压缩空气将流态覆膜砂吹入型腔,覆盖均匀,将钢水倒入铁模中浇铸形成螺母连接件胚件;
(4)将螺母连接件胚件加热到400-450℃,保持3-4小时,再在30-40分钟内升温至750-800℃,用淬火油进行淬火冷,却,再将淬火后的螺母连接件在380-400℃下进行回火35-45分钟,再从回火炉中取出放入280-300℃的回火油中冷却,将热处理后的螺母连接件进行车削加工,获得成品;
(5)将成品放入浓硫酸的电解槽内,螺母连接件置于电解槽的阳极,浓硫酸的浓度为310-380g/L,电解电压为25-26伏,电解时间为40-43分钟,取出后再将成品在 85-100℃的温度下浸入磷酸盐溶液处理9-10分钟,取出放入发黑液中浸泡10-20分钟进行表面发黑处理,所述发黑液为重量份为硝酸钠5-10、氢氧化钠60-70、亚硝酸钠10-20、水100-110的混合溶液。
本发明在高碳钢的基础上添加碳、锰、铌、铅、钼、镁、镍、钨、锡等微量合金元素,这样铬、锰的添加增加了耐磨性和耐腐蚀性,且添加了钨、钼等元素的添加保持了足够的硬度,本发明使用精炼调渣剂用于钢水的熔炼,能使钢水中的杂质进一步减低,提高钢水的纯度,且向其中吹入氧气和二氧化碳,通过吹入二氧化碳代替部分氧气与铁水中各元素反应减少放热量,从而使吹炼前期温度得到有效控制,有利于转炉熔池脱磷,取出氧化夹杂物,通过多次精炼和取样分析技术,严格控制钢水的质量,且本发明采用铁模覆沙工艺,铁型的刚性能转变球铁在凝固过程中石墨化膨胀方向,由向外膨胀变为向内膨胀,实现了石墨化膨胀自补缩无冒口铸造;由于覆砂层薄,型腔不易变形,导致铸件的精度大为提高;覆砂层的存在提高了铸件的使用寿命,降低了生产成本;本发明通过合理控制铸后处理温度,提高铸件的机械性能,且采用浓硫酸电解和发黑池处理技术,提高了螺母的表面抗氧化性能。
具体实施方式
一种利用铁模喷砂工艺铸造螺母连接件,其特征在于,包括以下重量份组分:碳0.26-0.34、锰0.17-0.25、钋0.05-0.14、铝2.15-3.25、钼0.03-0.05、镁2.4-2.7、镍0.073-0.14、碲0.032-0.045、硼0.07-0.08、精炼调渣剂20-25、适量氮气、余量Fe和不可避免的杂质;所述精炼调渣剂由以下重量份原料组成:铝矾土20-45、大理石15-25、石英砂19-44、钡5-10、活性石灰10-11、氟石膏9-10、硅微粉4-8、电熔镁粉6-7、钠长石5-10、铝丸2-5;所述精炼调渣剂的制备方法为:将铝矾土、大理石、硅微粉、电熔镁粉、石英砂、钡、活性石灰、氟石膏、钠长石、铝丸加适量的水混合,再制成球状,然后放入竖炉中用焦炭作燃料预熔,预熔温度为1400-1500℃,再搅拌均匀,液态渣再经过液氮快速冷却,再放入球磨机中研磨成粉末状即得。
所述利用铁模喷砂工艺铸造螺母连接件的制备方法,其特征在于,包括以下步骤:
(1)将按重量计的原料碳、锰、铌、铅、钼、镁、镍、钨、锡和铁放入预热炉,将熔炼原料预热至250℃-350℃后放入感应炉中进行熔炼,控制温度在1500-1600℃,在依次铝质还原剂、钙质冶金辅料,再用惰性物氮气封炉口;
(2)将液态二氧化碳气瓶中的二氧化碳通过汇流排输送到低温液体汽化器中,再放入缓冲储气罐中,备用,在熔化过程中向炉池内吹入氧气和二氧化碳的混合气体,且同时进行2-5次炉底搅拌,熔体经搅拌均匀后立即取样,进行炉前分析,取样温度不得低于1400℃,根据取样分析的结果,进行脱硫、脱氧,再加入部分精炼调渣剂进行一次精炼、后间隔30-35分钟后再进行添加剩余精炼调渣剂进行二次精炼,获得钢水;
(3)将铁模放入芯子窑中加热,然后逐一进行造型,控制温度在200-230℃,利用低压0.4-0.5MPa压缩空气将流态覆膜砂吹入型腔,覆盖均匀,将钢水倒入铁模中浇铸形成螺母连接件胚件;
(4)将螺母连接件胚件加热到400-450℃,保持3-4小时,再在30-40分钟内升温至750-800℃,用淬火油进行淬火冷,却,再将淬火后的螺母连接件在380-400℃下进行回火35-45分钟,再从回火炉中取出放入280-300℃的回火油中冷却,将热处理后的螺母连接件进行车削加工,获得成品;
(5)将成品放入浓硫酸的电解槽内,螺母连接件置于电解槽的阳极,浓硫酸的浓度为310-380g/L,电解电压为25-26伏,电解时间为40-43分钟,取出后再将成品在 85-100℃的温度下浸入磷酸盐溶液处理9-10分钟,取出放入发黑液中浸泡10-20分钟进行表面发黑处理,所述发黑液为重量份为硝酸钠5-10、氢氧化钠60-70、亚硝酸钠10-20、水100-110的混合溶液。
Claims (2)
1.一种利用铁模喷砂工艺铸造螺母连接件,其特征在于,包括以下重量份组分:碳0.26-0.34、硼0.07-0.08、钋0.05-0.14、铝2.15-3.25、钼0.03-0.05、镁2.4-2.7、镍0.073-0.14、碲0.032-0.045、锰0.17-0.25、精炼调渣剂20-25、适量氮气、余量Fe和不可避免的杂质;所述精炼调渣剂由以下重量份原料组成:铝矾土20-45、大理石15-25、石英砂19-44、钡5-10、活性石灰10-11、氟石膏9-10、硅微粉4-8、电熔镁粉6-7、钠长石5-10、铝丸2-5;所述精炼调渣剂的制备方法为:将铝矾土、大理石、硅微粉、电熔镁粉、石英砂、钡、活性石灰、氟石膏、钠长石、铝丸加适量的水混合,再制成球状,然后放入竖炉中用焦炭作燃料预熔,预熔温度为1400-1500℃,再搅拌均匀,液态渣再经过液氮快速冷却,再放入球磨机中研磨成粉末状即得。
2.如权利要求1所述利用铁模喷砂工艺铸造螺母连接件的制备方法,其特征在于,包括以下步骤:
(1)将按重量计的原料碳、锰、铌、铅、钼、镁、镍、钨、锡和铁放入预热炉,将熔炼原料预热至250℃-350℃后放入感应炉中进行熔炼,控制温度在1500-1600℃,在依次铝质还原剂、钙质冶金辅料,再用惰性物氮气封炉口;
(2)将液态二氧化碳气瓶中的二氧化碳通过汇流排输送到低温液体汽化器中,再放入缓冲储气罐中,备用,在熔化过程中向炉池内吹入氧气和二氧化碳的混合气体,且同时进行2-5次炉底搅拌,熔体经搅拌均匀后立即取样,进行炉前分析,取样温度不得低于1400℃,根据取样分析的结果,进行脱硫、脱氧,再加入部分精炼调渣剂进行一次精炼、后间隔30-35分钟后再进行添加剩余精炼调渣剂进行二次精炼,获得钢水;
(3)将铁模放入芯子窑中加热,然后逐一进行造型,控制温度在200-230℃,利用低压0.4-0.5MPa压缩空气将流态覆膜砂吹入型腔,覆盖均匀,将钢水倒入铁模中浇铸形成螺母连接件胚件;
(4)将螺母连接件胚件加热到400-450℃,保持3-4小时,再在30-40分钟内升温至750-800℃,用淬火油进行淬火冷,却,再将淬火后的螺母连接件在380-400℃下进行回火35-45分钟,再从回火炉中取出放入280-300℃的回火油中冷却,将热处理后的螺母连接件进行车削加工,获得成品;
(5)将成品放入浓硫酸的电解槽内,螺母连接件置于电解槽的阳极,浓硫酸的浓度为310-380g/L,电解电压为25-26伏,电解时间为40-43分钟,取出后再将成品在 85-100℃的温度下浸入磷酸盐溶液处理9-10分钟,取出放入发黑液中浸泡10-20分钟进行表面发黑处理,所述发黑液为重量份为硝酸钠5-10、氢氧化钠60-70、亚硝酸钠10-20、水100-110的混合溶液。
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