CN108676990A - 一种3Cr2W8V模具的热处理工艺 - Google Patents
一种3Cr2W8V模具的热处理工艺 Download PDFInfo
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Abstract
一种3Cr2W8V模具的热处理工艺,包括以下步骤:退火、淬火、回火、盐浴处理和离子硫氮共渗法;本发明通过对3Cr2W8V模具的热处理工艺进行优化调整,有效改善了3Cr2W8V模具的硬度、韧性及其耐磨性,此外,3Cr2W8V模具经离子硫氮共渗处理后,型腔的耐磨性和抗咬合性得到明显提高,模具寿命比未经共渗时提高2~4倍,产品的表面光亮度也有明显的提高,延长了模具的使用寿命,提高了经济效益。
Description
技术领域
本发明涉及材料的热处理工艺领域,具体为一种3Cr2W8V模具的热处理工艺。
背景技术
铝合金零件在压铸模成形过程中,当熔融的铝合金液被压进型腔时,型腔的表面温度可达600℃左右。为了防止铝合金液粘附在型腔上和型腔温度过高,工作时必须对模具型腔频繁地涂抹防粘涂料,由此造成型腔表面温度的反复升降。为确保其良好的导热性和耐热疲劳性,通常采用3Cr2W8V压铸模对铝合金零件进行压铸成形,但是铝合金零件压铸模由于其成形特点,常常存在粘模、侵蚀、热疲劳、磨损等现象。影响压铸模使用的因素较多,如压铸件的结构、模具材料及热处理、压铸模的结构与制造工艺、压铸工艺参数的选择等。热处理可以改变材料的金相组织,保证模具零件必要的强度和刚度、高温下的尺寸稳定性、抗热疲劳性能和材料的切削性能等,对压铸模的使用寿命起着非常重要的作用,因此,正确的热处理工艺是提高压铸模使用寿命的一个关键。因此,为了提高模具的断裂韧性和耐磨性,以延长模具的使用寿命,急需开发一种新的热处理工艺。针对上述情况,公开号为CN201410723688.6,CN201210264588.2,CN201010148982.0的专利申请都提出了针对不同3Cr2W8V模具的热处理工艺,但是上述方法针对性较强,效果并不是很理想,使用寿命短。
发明内容
为了克服上述现有技术的不足,本发明针提出了一种3Cr2W8V模具的热处理工艺,能够提高热处理的效果,有效延长模具的使用寿命。
为了达到上述目的,本发明采用的技术方案为:
一种3Cr2W8V模具的热处理工艺,其步骤为:
步骤一:退火
将锻件安装于箱式炉中加热至800~850℃,保温140~150min,随炉冷却至730~750℃再保温160~180min,以30℃/h的限速冷却至480~500℃,再升温至550℃进行去氢退火,然后出炉空冷至室温;
步骤二:淬火
预先准备三个不同温度的盐浴炉,分别是550~600℃的分级盐浴炉,850~900℃中温盐浴炉,1130~1450℃的高温盐浴炉;将步骤一退火处理后的锻件先置于分级盐浴炉中预热20~25min,然后迅速转入中温盐浴炉中再预热15~18min,随后转入高温盐浴炉中保温10~12min,取出投入550~600℃的分级盐浴炉中进行冷却,停留时间为16~20min,取出放入预先加热到260~280℃的熔融硝盐中继续冷却,停留时间为20~25min,取出空冷;
步骤三:回火
将步骤二淬火处理后的锻件置于箱式炉中进行两次高温回火,第一次回火加热温度为180~220℃,保温时间为90~100min,用油冷却,随后再进行第二次回火,加热温度为160~200℃,保温时间0.8~1h;
步骤四:盐浴处理
将步骤三回火处理后的锻件置于氮碳共渗温度为530~600℃下保温1.5~3h后,在氧化温度为380~400℃保温20~30min;
步骤五:离子硫氮共渗法
将步骤四盐浴处理后的锻件放置在加热至550~580℃的离子氮化炉设备,真空度为260~400Pa,在共渗剂中共渗时间1.8~2h。
所述分级盐浴炉的盐浴的成分为:NaCl、BaCl2、CaCl2,质量分数分别为:21%、31%、48%;
所述中温盐浴炉的盐浴的成分为:BaCl2、KCl,质量分数分别为:50%、50%;
所述高温盐浴炉的盐浴的成分为100%BaCl2;
所述熔融硝盐的成分为:NaNO3、KNO3,质量分数分别为:45%、55%;
所述的共渗剂体积分数之比为SO2:NH3:乙醇=1:8:1。
本发明的有益效果:
本发明通过对3Cr2W8V模具的热处理工艺进行优化调整,有效改善了3Cr2W8V模具的硬度、韧性及其耐磨性,此外,3Cr2W8V模具经离子硫氮共渗处理后,型腔的耐磨性和抗咬合性得到明显提高,模具寿命比未经共渗时提高2~4倍,产品的表面光亮度也有明显的提高,延长了模具的使用寿命,提高了经济效益。
具体实施方式
下面通过具体实施方式来进一步说明本发明的技术方案。
实施例1
一种3Cr2W8V模具的热处理工艺,其步骤为:
步骤一:退火
将锻件安装于箱式炉中加热至850℃,保温150min,随炉冷却至730℃再保温180min,以30℃/h的限速冷却至490℃,再升温至550℃进行去氢退火,然后出炉空冷至室温,等温退火后锻件的硬度为220HBS。
步骤二:淬火
预先准备三个不同温度的盐浴炉,分别是550℃的分级盐浴炉,850℃中温盐浴炉,1130℃的高温盐浴炉;将退火处理后的锻件先置于分级盐浴炉中预热25min,然后迅速转入中温盐浴炉中再预热18min,随后转入高温盐浴炉中保温12min,取出投入560℃的分级盐浴炉中进行冷却,停留时间为16min,待内外温度一致后,取出放入预先加热到260℃的熔融硝盐中继续冷却,停留时间为20min,取出空冷,淬火后硬度为50HRC。
步骤三:回火
将淬火后的锻件置于箱式炉中进行两次高温回火,第一次回火加热温度为200℃,保温时间为90min,用油冷却,随后再进行第二次回火,加热温度为180℃,保温时间1h,回火后硬度为44HRC。
步骤四:盐浴处理
将的回火的锻件置于氮碳共渗温度为550℃下保温2h后,在氧化温度为390℃保温20min。
步骤五:离子硫氮共渗法
锻件放置在加热至550℃的离子氮化炉设备,共渗剂体积分数之比为SO2:NH3:乙醇=1:8:1,真空度为350Pa,共渗时间2h,渗层硬度高于1000HV。
实施例2:
一种3Cr2W8V模具的热处理工艺,其步骤为:
步骤一:退火
将锻件安装于箱式炉中加热至800℃,保温140min,随炉冷却至750℃再保温160min,以30℃/h的限速冷却至480℃,再升温至550℃进行去氢退火,然后出炉空冷至室温,等温退火后锻件的硬度为220HBS。
步骤二:淬火
预先准备三个不同温度的盐浴炉,分别是600℃的分级盐浴炉,900℃中温盐浴炉,1450℃的高温盐浴炉;将退火处理后的锻件先置于分级盐浴炉中预热20min,然后迅速转入中温盐浴炉中再预热15min,随后转入高温盐浴炉中保温10min,取出投入550℃的分级盐浴炉中进行冷却,停留时间为20min,取出放入预先加热到280℃的熔融硝盐中继续冷却,停留时间为25min,取出空冷,淬火后硬度为55HRC。
步骤三:回火
将淬火后的锻件置于箱式炉中进行两次高温回火,第一次回火加热温度为180℃,保温时间为100min,用油冷却,随后再进行第二次回火,加热温度为160℃,保温时间0.8h,回火后硬度为46HRC。
步骤四:盐浴处理
将的回火的锻件置于氮碳共渗温度为530℃下保温1.5h后,在氧化温度为380℃保温30min。
步骤五:离子硫氮共渗法
锻件放置在加热至580℃的离子氮化炉设备,共渗剂体积分数之比为SO2:NH3:乙醇=1:8:1,真空度为260Pa,共渗时间1.8h,渗层硬度高于1000HV。
实施例3
一种3Cr2W8V模具的热处理工艺,其步骤为:
步骤一:退火
将锻件安装于箱式炉中加热至820℃,保温145min,随炉冷却至740℃再保温170min,以30℃/h的限速冷却至480℃,再升温至550℃进行去氢退火,然后出炉空冷至室温,等温退火后锻件的硬度为220HBS。
步骤二:淬火
预先准备三个不同温度的盐浴炉,分别是580℃的分级盐浴炉,880℃中温盐浴炉,1300℃的高温盐浴炉;将退火处理后的锻件先置于分级盐浴炉中预热23min,然后迅速转入中温盐浴炉中再预热16min,随后转入高温盐浴炉中保温11min,取出投入600℃的分级盐浴炉中进行冷却,停留时间为18min,取出放入预先加热到270℃的熔融硝盐中继续冷却,停留时间为22min,取出空冷,淬火后硬度为53HRC。
步骤三:回火
将淬火后的锻件置于箱式炉中进行两次高温回火,第一次回火加热温度为220℃,保温时间为95min,用油冷却,随后再进行第二次回火,加热温度为200℃,保温时间0.9h,回火后硬度为45HRC。
步骤四:盐浴处理
将的回火的锻件置于氮碳共渗温度为600℃下保温3h后,在氧化温度为400℃保温20min。
步骤五:离子硫氮共渗法
锻件放置在加热至560℃的离子氮化炉设备,共渗剂体积分数之比为SO2:NH3:乙醇=1:8:1,真空度为400Pa,共渗时间1.9h,渗层硬度高于1000HV。
本实施例通过对3Cr2W8V模具的热处理工艺进行优化调整,有效改善了3Cr2W8V模具的硬度、韧性及其耐磨性,此外,经离子硫氮共渗处理后3Cr2W8V模具,型腔的耐磨性和抗咬合性得到明显提高,模具寿命比未经共渗时提高2~4倍,产品的表面光亮度也有明显的提高。
Claims (3)
1.一种3Cr2W8V模具的热处理工艺,其特征在于,其步骤为:
步骤一:退火
将锻件安装于箱式炉中加热至800~850℃,保温140~150min,随炉冷却至730~750℃再保温160~180min,以30℃/h的限速冷却至480~500℃,再升温至550℃进行去氢退火,然后出炉空冷至室温;
步骤二:淬火
预先准备三个不同温度的盐浴炉,分别是550~600℃的分级盐浴炉,850~900℃中温盐浴炉,1130~1450℃的高温盐浴炉;将步骤一退火处理后的锻件先置于分级盐浴炉中预热20~25min,然后迅速转入中温盐浴炉中再预热15~18min,随后转入高温盐浴炉中保温10~12min,取出投入550~600℃的分级盐浴炉中进行冷却,停留时间为16~20min,取出放入预先加热到260~280℃的熔融硝盐中继续冷却,停留时间为20~25min,取出空冷;
步骤三:回火
将步骤二淬火处理后的锻件置于箱式炉中进行两次高温回火,第一次回火加热温度为180~220℃,保温时间为90~100min,用油冷却,随后再进行第二次回火,加热温度为160~200℃,保温时间0.8~1h;
步骤四:盐浴处理
将步骤三回火处理后的锻件置于氮碳共渗温度为530~600℃下保温1.5~3h后,在氧化温度为380~400℃保温20~30min;
步骤五:离子硫氮共渗法
将步骤四盐浴处理后的锻件放置在加热至550~580℃的离子氮化炉设备,真空度为260~400Pa,在共渗剂中共渗时间1.8~2h。
2.根据权利要求1所述的一种3Cr2W8V模具的热处理工艺,其特征在于,所述分级盐浴炉的盐浴的成分为:NaCl、BaCl2、CaCl2,质量分数分别为:21%、31%、48%;
所述中温盐浴炉的盐浴的成分为:BaCl2、KCl,质量分数分别为:50%、50%;
所述高温盐浴炉的盐浴的成分为100%BaCl2;
所述熔融硝盐的成分为:NaNO3、KNO3,质量分数分别为:45%、55%。
3.根据权利要求1所述的一种3Cr2W8V模具的热处理工艺,其特征在于,所述的共渗剂体积分数之比为SO2:NH3:乙醇=1:8:1。
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