CN111570714A - 一种温镦耐候抗延迟断裂高强螺栓成型工艺 - Google Patents
一种温镦耐候抗延迟断裂高强螺栓成型工艺 Download PDFInfo
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Abstract
本发明公开了一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:将直条料采用高频加热至300‑400℃,断料,降至室温,上料,送入感应加热器中加热,温度控制在500‑600℃,加热时间为2‑3s;将S1加热后工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,退料顶出,得到预成型工件;将预成型工件送入氨水中脱脂处理,脱脂温度为30‑35℃,水洗,送入硫酸溶液中酸洗10‑20s,酸洗温度为5‑15℃,水洗,磷化处理,水洗,风干,送入亚硝酸钠溶液中发黑处理2‑5min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
Description
技术领域
本发明涉及螺栓成型技术领域,尤其涉及一种温镦耐候抗延迟断裂高强螺栓成型工艺。
背景技术
在传统的汽车行业中,紧固件是最普通、最常用的标准件,特别是螺栓,其使用量非常大。现有的螺栓冷镦造工艺先对材料进行剪料,接着冷镦成型,然后对螺栓头部进行切边成型,再对螺栓中部进行车削形成车槽,这会产生大量的废料,从而造成材料的浪费使得成本提高。而目前的螺栓热镦普遍采用的温度为700-900℃,较高的热镦温度给镦制工艺带来很多困难,因此,在热镦钛合金工件生产中迫切需要一种成型温度较低的镦制工艺。
金属材料加热到“兰脆”区温度以上再结晶温度以下时的镦锻过程称为温镦,温镦范围在400-600℃为宜,含碳量高的金属材料可提高到650℃。温镦工艺不仅不会产生大量的废料,而且塑变性好,镦制工艺简单,但目前采用温镦工艺制备的高强度螺栓存在耐候、抗延迟断裂性能差的缺点,亟待解决。
发明内容
本发明的目的是为了解决现有技术中存在的缺点,而提出的一种温镦耐候抗延迟断裂高强螺栓成型工艺。
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至300-400℃,断料,降至室温,上料,送入感应加热器中加热,温度控制在500-600℃,加热时间为2-3s;
S2、将S1加热后工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,退料顶出,得到预成型工件;
S3、将预成型工件送入氨水中脱脂处理,脱脂温度为30-35℃,水洗,送入硫酸溶液中酸洗10-20s,酸洗温度为5-15℃,水洗,磷化处理,水洗,风干,送入亚硝酸钠溶液中发黑处理2-5min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
优选地,S1中,直条料的组分按质量百分比包括:C 0.31-0.36%,Mn 0.31-0.35%,Si 0.11-0.13%,Ba 0.02-0.025%,W 0.002-0.008%,Ni 0.08-0.11%,Sn 0.01-0.016%,P 0.001-0.002%,S 0.001-0.002%,余量为Fe。
优选地,S1中,将直条料采用高频加热至330-370℃。
优选地,S1中,感应加热器中温度控制在520-580℃。
优选地,S3中,氨水的浓度为12-15wt%。
优选地,S3中,硫酸溶液浓度为0.1-0.18mol/L。
优选地,S3的磷化处理具体如下:采用浓度为10-12wt%磷酸盐溶液中磷化1-2min,磷化温度为30-40℃。
优选地,S3的磷酸盐中,阳离子为锌离子、铁离子、钙离子、镍离子、锰离子中至少一种。
优选地,S3中,亚硝酸钠溶液浓度为2-4wt%。
本发明的技术效果如下:
(1)本发明采用热镦工艺,解决了高强度螺栓达到所需的硬度与强度时发生不耐候、易延迟断裂的问题,在使用过程中螺栓不易断裂,延长螺栓寿命;
(2)本发明采用高频加热至300-400℃断料+500-600℃热镦处理,细化材料的加工工艺,材料加工塑性高,在模具中不仅成型性极好,而且工件内部无延伸的裂纹,抗延迟断裂极好,本发明与现有同类工艺相比,不仅节约能源,而且材料组织晶相均匀,所得高强螺栓的硬度和强度高,可满足各种机械设备或装置的不同使用要求。
(3)本发明所得预成型工件依次经过氨水脱脂、硫酸酸洗、磷酸盐磷化及亚硝酸钠发黑处理,不仅外观表面光洁度大大提高,而且提高产品质量稳定性,降低劳动强度;本发明采用温镦成型工艺生产的产品,经实际使用,其耐候、抗延迟断裂性的特色已领先国内紧固件行业水平,社会和经济效益明显。
具体实施方式
下面结合具体实施例对本发明作进一步解说。
实施例1
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至300℃,送入切料模具中进行断料,降至室温,经传送带输入振动盘中进行自动排序上料,由气缸推入感应加热器中,通过温度自动控制装置进行加热,温度控制在600℃,加热时间为2s;
直条料的组分按质量百分比包括:C 0.36%,Mn 0.31%,Si 0.13%,Ba 0.02%,W0.008%,Ni 0.08%,Sn 0.016%,P 0.001%,S 0.002%,余量为Fe;
S2、通过夹钳将加热完成的工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,成型后的工件经过退料装置顶出,得到预成型工件;
S3、将预成型工件送入浓度为12wt%氨水中脱脂处理,脱脂温度为35℃,水洗,送入浓度为0.1mol/L硫酸溶液中酸洗20s,酸洗温度为5℃,水洗,送入浓度为12wt%磷酸盐溶液中磷化1min,磷化温度为40℃,水洗,风干,送入浓度为2wt%亚硝酸钠溶液中发黑处理5min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
经检测,本实施例所得螺栓心部硬度为50.2HRC,螺栓螺纹段硬度为47.3HRC,抗拉强度为1180Mpa,屈服强度为1153Mpa,延伸率为12.7%,断面收缩率为40.3%,冲击韧性为47.8J/cm2。
实施例2
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至400℃,送入切料模具中进行断料,降至室温,经传送带输入振动盘中进行自动排序上料,由气缸推入感应加热器中,通过温度自动控制装置进行加热,温度控制在500℃,加热时间为3s;
直条料的组分按质量百分比包括:C 0.31%,Mn 0.35%,Si 0.11%,Ba 0.025%,W 0.002%,Ni 0.11%,Sn 0.01%,P 0.002%,S 0.001%,余量为Fe;
S2、通过夹钳将加热完成的工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,成型后的工件经过退料装置顶出,得到预成型工件;
S3、将预成型工件送入浓度为15wt%氨水中脱脂处理,脱脂温度为30℃,水洗,送入浓度为0.18mol/L硫酸溶液中酸洗10s,酸洗温度为15℃,水洗,送入浓度为10wt%磷酸盐溶液中磷化2min,磷化温度为30℃,水洗,风干,送入浓度为4wt%亚硝酸钠溶液中发黑处理2min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
经检测,本实施例所得螺栓心部硬度为51.7HRC,螺栓螺纹段硬度为46.7HRC,抗拉强度为1209Mpa,屈服强度为1112Mpa,延伸率为13.5%,断面收缩率为37.6%,冲击韧性为50.1J/cm2。
实施例3
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至330℃,送入切料模具中进行断料,降至室温,经传送带输入振动盘中进行自动排序上料,由气缸推入感应加热器中,通过温度自动控制装置进行加热,温度控制在580℃,加热时间为2.5s;
直条料的组分按质量百分比包括:C 0.33%,Mn 0.34%,Si 0.115%,Ba0.024%,W 0.004%,Ni 0.10%,Sn 0.012%,P 0.0017%,S 0.0015%,余量为Fe;
S2、通过夹钳将加热完成的工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,成型后的工件经过退料装置顶出,得到预成型工件;
S3、将预成型工件送入浓度为13wt%氨水中脱脂处理,脱脂温度为33℃,水洗,送入浓度为0.12mol/L硫酸溶液中酸洗18s,酸洗温度为8℃,水洗,送入浓度为11.5wt%磷酸盐溶液中磷化1.3min,磷化温度为37℃,水洗,风干,送入浓度为2.5%亚硝酸钠溶液中发黑处理4min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
经检测,本实施例所得螺栓心部硬度为51.5HRC,螺栓螺纹段硬度为48.6HRC,抗拉强度为1224Mpa,屈服强度为1213Mpa,延伸率为14.2%,断面收缩率为44.7%,冲击韧性为51.3J/cm2。
实施例4
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至370℃,送入切料模具中进行断料,降至室温,经传送带输入振动盘中进行自动排序上料,由气缸推入感应加热器中,通过温度自动控制装置进行加热,温度控制在520℃,加热时间为2.5s;
直条料的组分按质量百分比包括:C 0.35%,Mn 0.32%,Si 0.125%,Ba0.022%,W 0.006%,Ni 0.09%,Sn 0.014%,P 0.0014%,S 0.0011%,余量为Fe;
S2、通过夹钳将加热完成的工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,成型后的工件经过退料装置顶出,得到预成型工件;
S3、将预成型工件送入浓度为14wt%氨水中脱脂处理,脱脂温度为31℃,水洗,送入浓度为0.16mol/L硫酸溶液中酸洗12s,酸洗温度为12℃,水洗,送入浓度为10.5wt%磷酸盐溶液中磷化1.7min,磷化温度为33℃,水洗,风干,送入浓度为3.5%亚硝酸钠溶液中发黑处理3min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
经检测,本实施例所得螺栓心部硬度为51.9HRC,螺栓螺纹段硬度为47.8HRC,抗拉强度为1247Mpa,屈服强度为1164Mpa,延伸率为14.7%,断面收缩率为41.5%,冲击韧性为55.5J/cm2。
实施例5
一种温镦耐候抗延迟断裂高强螺栓成型工艺,包括如下步骤:
S1、将直条料采用高频加热至350℃,送入切料模具中进行断料,降至室温,经传送带输入振动盘中进行自动排序上料,由气缸推入感应加热器中,通过温度自动控制装置进行加热,温度控制在550℃,加热时间为2.5s;
直条料的组分按质量百分比包括:C 0.34%,Mn 0.33%,Si 0.12%,Ba 0.023%,W 0.005%,Ni 0.095%,Sn 0.013%,P 0.0013%,S 0.0012%,余量为Fe;
S2、通过夹钳将加热完成的工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,成型后的工件经过退料装置顶出,得到预成型工件;
S3、将预成型工件送入浓度为13.5wt%氨水中脱脂处理,脱脂温度为32℃,水洗,送入浓度为0.14mol/L硫酸溶液中酸洗15s,酸洗温度为10℃,水洗,送入浓度为11wt%磷酸盐溶液中磷化1.5min,磷化温度为35℃,水洗,风干,送入浓度为3%亚硝酸钠溶液中发黑处理3.5min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
经检测,本实施例所得螺栓心部硬度为52.1HRC,螺栓螺纹段硬度为49.8HRC,抗拉强度为1258Mpa,屈服强度为1110-1220Mpa,延伸率为15.3%,断面收缩率为45.6%,冲击韧性为56.2J/cm2。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (9)
1.一种温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,包括如下步骤:
S1、将直条料采用高频加热至300-400℃,断料,降至室温,上料,送入感应加热器中加热,温度控制在500-600℃,加热时间为2-3s;
S2、将S1加热后工件放入模具中,依次经过一次锻压头部预成型、二次锻压头部成型,退料顶出,得到预成型工件;
S3、将预成型工件送入氨水中脱脂处理,脱脂温度为30-35℃,水洗,送入硫酸溶液中酸洗10-20s,酸洗温度为5-15℃,水洗,磷化处理,水洗,风干,送入亚硝酸钠溶液中发黑处理2-5min,水洗,风干,得到温镦耐候抗延迟断裂高强螺栓。
2.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S1中,直条料的组分按质量百分比包括:C 0.31-0.36%,Mn 0.31-0.35%,Si 0.11-0.13%,Ba0.02-0.025%,W 0.002-0.008%,Ni 0.08-0.11%,Sn 0.01-0.016%,P 0.001-0.002%,S0.001-0.002%,余量为Fe。
3.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S1中,将直条料采用高频加热至330-370℃。
4.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S1中,感应加热器中温度控制在520-580℃。
5.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S3中,氨水的浓度为12-15wt%。
6.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S3中,硫酸溶液浓度为0.1-0.18mol/L。
7.根据权利要求1所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S3的磷化处理具体如下:采用浓度为10-12wt%磷酸盐溶液中磷化1-2min,磷化温度为30-40℃。
8.根据权利要求7所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S3的磷酸盐中,阳离子为锌离子、铁离子、钙离子、镍离子、锰离子中至少一种。
9.根据权利要求7所述温镦耐候抗延迟断裂高强螺栓成型工艺,其特征在于,S3中,亚硝酸钠溶液浓度为2-4wt%。
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