CN112080705B - 滚刀刀圈及制备方法 - Google Patents
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Abstract
本发明提供了一种滚刀刀圈及制备方法,包括以下重量百分比的组分:C 0.48~0.52%,Si 0.30~0.50%,Mn 0.20~0.60%,Cr 4.00~4.40%,Mo 0.90~1.30%,V 0.80~1.20%,Ti 0~0.02%,B 0.0010~0.0025%,P≤0.020%,S≤0.020%,余量为Fe。本发明制备的盾构/TBM滚刀刀圈,基体硬度在57HRC以上,淬硬层深度达到20mm以上,淬硬层硬度可达60HRC以上,冲击韧性达到20J/cm2。
Description
技术领域
本发明涉及盾构刀圈生产技术领域,具体涉及一种滚刀刀圈及制备方法。
背景技术
随着国内地下工程开发的加剧,盾构机以及全断面隧道掘进机(TBM)的应用越来越多。针对岩层,盾构机及TBM主要依靠滚刀进行破岩,但是滚刀刀圈很容易发生磨损。有研究表明,在某些项目中,用于刀具的费用占到掘进施工费用的1/3,刀具更换时间占总施工时间也达到了1/3。
目前用的较多的刀圈主要包括高碳H13类和DC53类。高碳H13类刀圈的冲击韧性较好,可达到20J/cm2以上,但是硬度仅为56~58HRC,硬度较低,耐磨性能不足,刀具磨损严重,换刀成本较高。而DC53类刀圈的C元素及合金元素含量明显增加,冶炼成本增加,虽然硬度有所提高,达到61~62HRC,但是冲击韧性下降明显,仅为5~6J/cm2,刀圈容易发生崩刃甚至断裂现象。以上两种刀圈都存在综合力学性能较差的问题。
发明内容
本发明提出了一种滚刀刀圈及制备方法,具有更好的耐磨性能,综合力学性能更好,提高了滚刀刀圈的使用寿命。
实现本发明的技术方案是:
一种滚刀刀圈,包括以下重量百分比的组分:C 0.48~0.52%,Si 0.30~0.50%,Mn0.20~0.60%,Cr 4.00~4.40%,Mo 0.90~1.30%,V 0.80~1.20%,Ti 0~0.02%,B 0.0010~0.0025%,P≤0.020%,S≤0.020%,余量为Fe。
所述滚刀刀圈的刃部硬度≥60HRC,刃部向内20mm处的硬度≥60HRC,基体硬度>57HRC,冲击韧性≥20J/cm2。
所述的滚刀刀圈的制备方法,包括以下步骤:
(1)配置原材料进行电炉冶炼;
(2)炉外精炼及真空脱气处理;
真空脱气处理有效降低了钢材氢含量、提高了钢的纯度,炉外精炼实现脱硫、脱氧、脱气、去除金属夹杂物及调整成分;
(3)气体保护电渣重熔处理;
主要目的是提高金属的纯度,改善铸锭结晶组织;
(4)镦拔钢锭,下料镦粗并模锻加工;
所用加热温度为1200-1250℃,保温时间2-3h。初始锻造温度1150-1200℃,终锻温度900-950℃。提高锻件的横向力学性能并减少工件的各向异性,反复的镦粗和拔长有利于打碎钢件中的碳化物,减少疏松等缺陷,优化微观组织结构,保存完成的金属流线;
(5)对锻造后的刀圈开孔、碾环处理;
采用双导向辊卧式轧环机,对锻打后的刀圈进行碾环加工处理,刀圈毛坯初步成型;
(6)刀圈毛坯真空调质热处理;
对粗加工后的刀圈进行真空调质处理,1040~1080℃保温3小时后油淬,然后在500~550℃进行三次高温回火;
(8)刀圈刃部感应淬火处理;
对刀圈刀刃进行感性淬火工艺处理,所述感应淬火的淬火温度为850-900℃,淬火时间为30s-10min,次数为1-10次,最终淬硬层深度达到20mm以上;
(8)刀圈整体感应回火处理。
所用感应回火的温度为160-200℃,回火时间为120-150min。对感应淬火后的整体刀圈做低温回火处理,释放刀圈局部应力,所述回火工序可通过感应回火、自回火、炉中回火等方式实现。
本发明的有益效果是:
(1)本发明添加一定的Ti元素、V元素和B元素,有利于提高强度,同时提高淬透性和淬硬层深度。
(2)在刀圈外侧进行感应淬火处理,由于加热和冷却速度快,刀圈外侧形成细晶马氏体,硬度较整体热处理提高,耐磨性能显著提高,并且分布有一定的压应力,抗疲劳性能增加;当马氏体中C含量超过0.3%时会形成大量孪晶马氏体,严重降低钢的抗冲击能力。本发明虽然添加了大约0.5%的C,但VC析出降低了马氏体中的C含量,所以有效抑制了孪晶马氏体的生成,因此刀圈的抗冲击韧性较高。此外,本发明刀圈刃部淬硬层深度要求达到20mm以上,刀圈抗磨损能力明显增加,同时有效改善了刀圈的综合力学性能,显著提高了刀圈的使用寿命。
(3)本发明制备的盾构/TBM滚刀刀圈,基体硬度在57HRC以上,淬硬层深度达到20mm以上,淬硬层硬度可达60HRC以上,冲击韧性达到20J/cm2,在较低的合金元素成本下,可以在提高滚刀刀圈硬度的同时保持较高的冲击韧性,综合性能优异,同时耐磨性能明显改善,有助于提高刀圈寿命,降低换刀频率和所需时间,缩短项目工期。
具体实施方式
下面将结合本发明实施例,对本发明的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
一种盾构/TBM滚刀刀圈新材料,化学成分组及重量百分含量为:C 0.48,Si 0.30,Mn 0.60,Cr 4.00,Mo 0.90,V 0.80,B 0.0025,P≤0.020,S≤0.020,余量为Fe和不可避免的杂质。
盾构/TBM滚刀刀圈制备方法,包括以下步骤:
(1)配置原材料进行电炉冶炼;
(2)炉外精炼及真空脱气处理;
(3)气体保护电渣重熔处理;
(4)镦拔钢锭,下料镦粗并模锻加工;所用加热温度为1200℃,保温时间3h。初始锻造温度1150℃,终锻温度900℃。
(5)对锻造后的刀圈开孔、碾环处理;
(6)刀圈毛坯调质热处理;
对粗加工后的刀圈进行真空调质处理,1040℃保温3小时后油淬,然后在530℃间进行三次高温回火;
(7)刀圈刃部感应淬火处理;
感应淬火的淬火温度为850℃,淬火时间为10min,次数为1次,最终淬硬层深度达到20mm,淬硬层硬度>60HRC,基体硬度在57HRC以上,刀圈内部的冲击韧性达到20J/cm2;
(8)刀圈整体感应回火处理。
所用感应回火的温度为200℃,回火时间为120min。对感应淬火后的整体刀圈做低温回火处理,释放刀圈局部应力,所述回火工序可通过感应回火、自回火、炉中回火等方式实现。
实施例2
一种盾构/TBM滚刀刀圈新材料,化学成分组及重量百分含量为:C 0.50,Si 0.43,Mn 0.20,Cr 4.28,Mo 1.20,V 1.05,Ti 0.01,B 0.0020,P≤0.020,S≤0.020,余量为Fe和不可避免的杂质。
盾构/TBM滚刀刀圈制备方法,包括以下步骤:
(1)配置原材料进行电炉冶炼;
(2)炉外精炼及真空脱气处理;
(3)气体保护电渣重熔处理;
(4)镦拔钢锭,下料镦粗并模锻加工;所用加热温度为1220℃,保温时间2.5h。初始锻造温度1170℃,终锻温度930℃。
(5)对锻造后的刀圈开孔、碾环处理;
(6)刀圈毛坯调质热处理;
对粗加工后的刀圈进行真空调质处理,1060℃保温3小时后油淬,然后在500℃间进行三次高温回火;
(7)刀圈刃部感应淬火处理;
感应淬火的淬火温度为880℃,淬火时间为2min,次数为5次,最终淬硬层深度达到30mm,淬硬层硬度>60HRC,基体硬度在57HRC以上,刀圈内部的冲击韧性达到20J/cm2;
(8)刀圈整体感应回火处理。
所用感应回火的温度为170℃,回火时间为140min。对感应淬火后的整体刀圈做低温回火处理,释放刀圈局部应力,所述回火工序可通过感应回火、自回火、炉中回火等方式实现。
实施例3
一种盾构/TBM滚刀刀圈新材料,化学成分组及重量百分含量为:C 0.52,Si 0.50,Mn 0.52,Cr 4.40,Mo 1.30,V 1.20,Ti 0.02,B 0.0010,P≤0.020,S≤0.020,余量为Fe和不可避免的杂质。
盾构/TBM滚刀刀圈制备方法,包括以下步骤:
(1)配置原材料进行电炉冶炼;
(2)炉外精炼及真空脱气处理;
(3)气体保护电渣重熔处理;
(4)镦拔钢锭,下料镦粗并模锻加工;所用加热温度为1250℃,保温时间2h。初始锻造温度1200℃,终锻温度950℃。
(5)对锻造后的刀圈开孔、碾环处理;
(6)刀圈毛坯调质热处理;
对粗加工后的刀圈进行真空调质处理,1080℃保温3小时后油淬,然后在550℃间进行三次高温回火;
(7)刀圈刃部感应淬火处理;
感应淬火的淬火温度为900℃,淬火时间为30s,次数为10次,最终淬硬层深度达到25mm,淬硬层硬度>60HRC,基体硬度在57HRC以上,刀圈内部的冲击韧性达到20J/cm2;
(8)刀圈整体感应回火处理。
所用感应回火的温度为160℃,回火时间为150min。对感应淬火后的整体刀圈做低温回火处理,释放刀圈局部应力,所述回火工序可通过感应回火、自回火、炉中回火等方式实现。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (2)
1.一种滚刀刀圈,其特征在于包括以下重量百分比的组分:C 0.48~0.52%,Si 0.30~0.50%,Mn 0.20~0.60%,Cr 4.00~4.40%,Mo 0.90~1.30%,V 0.80~1.20%,Ti 0.01~0.02%,B0.0010~0.0025%,P≤0.020%,S≤0.020%,余量为Fe;
其制备方法包括以下步骤:
(1)配置原材料进行电炉冶炼;
(2)炉外精炼及真空脱气处理;
(3)气体保护电渣重熔处理;
(4)镦拔钢锭,下料镦粗并模锻加工,加热温度为1200-1250℃,保温时间2-3h,初始锻造温度1150-1200℃,终锻温度900-950℃;
(5)对锻造后的刀圈开孔、碾环处理;
(6)刀圈毛坯真空调质热处理,1040~1080℃保温3小时后油淬,然后在500~550℃进行3次高温回火;
(7)刀圈刃部感应淬火处理;所述感应淬火的淬火温度为850-900℃,淬火时间为30s-10min,次数为1-10次,最终淬硬层深度达到20mm以上;
(8)刀圈整体感应回火处理,所述感应回火的温度为160-200℃,回火时间为120-150min。
2.根据权利要求1所述的滚刀刀圈,其特征在于:所述滚刀刀圈的刃部硬度≥60HRC,刃部向内20mm处的硬度≥60HRC,基体硬度>57HRC,冲击韧性≥20J/cm2。
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