CN114951661A - 一种带通孔或者盲孔钨合金大制品的制备方法 - Google Patents
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- 238000005245 sintering Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 20
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 8
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
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- 238000002156 mixing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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Abstract
本发明公开了一种带通孔或者盲孔钨合金大制品的制备方法,它涉及粉末冶金技术领域。其步骤为:将钨粉、镍粉、铁粉、钴粉、锰粉进行球磨,并按照产品尺寸设计胶套及芯杆模具,然后将混合粉通过胶套及芯杆模具在冷等静压机中成形,脱模,最后将成型压坯进行烧结。本发明操作简便,通过该方法实现钨合金大制品的生产,能提高钨合金原材料的利用率,提高后续机加工序的生产效率,降低生产成本,经济效益好,应用前景广阔。
Description
技术领域
本发明涉及的是粉末冶金技术领域,具体涉及一种带通孔或者盲孔钨合金大制品的制备方法。
背景技术
目前,在粉末冶金领域,对于大件异性或者通孔产品的制备,常规方法通常采用压制一件实心的圆柱或方块者来实现烧结,经过后续加工来实现产品的要求,存在以下缺点:(1)原材料投入方面成本增加;(2)在运输装卸过程中,由于产品较为笨重,运输和吊装极为不便;(3)在后续机加工序中切削量较大,大大降低生产效率,增加生产成本。(4)生产的毛坯料一致性较差,增加加工余量的尺寸,提高成本。
为了解决上述问题,开发一种带通孔或者盲孔钨合金大制品的制备方法尤为必要。
发明内容
针对现有技术上存在的不足,本发明目的是在于提供一种带通孔或者盲孔钨合金大制品的制备方法,操作简便,提高钨合金原材料的利用率,提高后续机加工序的生产效率,降低生产成本,经济效益好,易于推广使用。
为了实现上述目的,本发明是通过如下的技术方案来实现:一种带通孔或者盲孔钨合金大制品的制备方法,其步骤为:
①称取原材料:钨粉、镍粉、铁粉、钴粉、锰粉,并对原材料进行球磨;
②设计胶套和芯杆模具:胶套采用橡胶套,芯杆采用铝杆,胶套外加钢外壳,钢外壳外侧焊接有吊环,模具底部为固定圈;
③成型:将混合粉通过胶套及芯杆模具在冷等静压机中成型;
④脱模:先取出芯杆,再对压坯产品进行吊装;
⑤烧结:采用真空炉对成型压坯产品进行二步法烧结。
作为优选,所述的步骤①中钨粉的费氏粒度为2.0-4.0μm,镍粉的费氏粒度为2.0-4.0μm,铁粉费氏粒度为5.0-8.0μm,钴粉的费氏粒度为0.9-2.0μm;原材料中钨粉的质量分数为80.0-97.0%;镍粉与铁粉的质量百分比为Ni:Fe=(1.5-4):1;钴粉与镍粉的质量百分比为Co:Ni=(0.6-1.0):1;锰粉的质量分数为0.02-0.06%。原材料的球磨时间为6-22h,球料比为1.5:2.0。
作为优选,所述的步骤②中芯杆的径向收缩系数为1.25-1.34,轴向收缩系数为1.08-1.1,芯杆脱模角为0.5-1.0°,芯杆上设置有一个M8-M14的螺纹,方便脱模;所述的钢外壳与胶套的尺寸相差2-3㎜。
作为优选,所述的步骤③成型压力为165-200MPa,保压2-10min。
作为优选,所述的步骤④采用行车,先吊取芯杆,再对产品进行吊装
作为优选,所述的步骤⑤中真空炉的真空度<10-3,一次烧结温度为1350-1500℃,二次烧结温度为1400-1600℃,烧结时间为30-65min。
本发明的有益效果:本发明操作简便,通过该方法实现钨合金大制品的生产,能提高钨合金原材料的利用率,提高后续机加工序的生产效率,降低生产成本,经济效益好,应用前景广阔。
附图说明
下面结合附图和具体实施方式来详细说明本发明;
图1为本发明胶套和芯杆模具的结构示意图。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明。
参照图1,本具体实施方式采用以下技术方案:一种带通孔或者盲孔钨合金大制品的制备方法,其步骤为:
①称取原材料:钨粉、镍粉、铁粉、钴粉、锰粉,混合,混合粉中钨粉的质量分数为80.0-97.0%;镍粉与铁粉的质量百分比为Ni:Fe=(1.5-4):1;钴粉与镍粉的质量百分比为Co:Ni=(0.6-1.0):1;锰粉的质量分数为0.02-0.06%;对原材料进行球磨,球磨时间为6-22h,球料比为1.5:2.0;
②设计胶套和芯杆模具:胶套(1)外加钢外壳(3),钢外壳(3)外侧焊接有吊环(4),模具底部为固定圈(5);
③成型:将混合粉(6)通过胶套及芯杆模具在冷等静压机中完成成型,采用冷等静压机,根据产品大小旋转等静压型号,其成型压力为165-200MPa,保压2-10min,优选为3-5min;
④脱模:采用行车,先取出芯杆,再对压坯产品进行吊装;
⑤烧结:采用真空炉或者中频炉对成型压坯产品进行二步法烧结,真空炉的真空度<10-3,一次烧结为预烧结,烧结温度为1350-1500℃,二次烧结温度为1400-1600℃,烧结时间为30-65min。
值得注意的是,所述的步骤①中钨粉的费氏粒度为2.0-4.0μm,镍粉的费氏粒度为2.0-4.0μm,铁粉费氏粒度为5.0-8.0μm,钴粉的费氏粒度为0.9-2.0μm。
本具体实施方式采用混料-设计模具-成型-脱模-烧结的工艺,根据产品要求按照工艺将原材料W、Ni、Fe、Co、Mn粉进行球磨,并按照产品尺寸设计胶套及芯杆模具,然后将混合粉通过胶套及芯杆模具在压力≥165Mpa的冷等静压机中成形,最后将成型压坯进行烧结。
其中设计胶套和芯杆模具的原则如下:胶套(1)采用橡胶套,耐磨损,有弹性;芯杆(2)采用铝杆,易切削,重量小易搬运,不易变形,且芯杆(2)的径向收缩系数为1.25-1.34,轴向收缩系数为1.08-1.1,芯杆脱模角为0.5-1.0°,芯杆(2)上设置有一个M8-M14的螺纹,方便脱模;钢外壳(3)与胶套(1)的尺寸相差2-3㎜。产品加芯杆时,根据收缩系数算出胶套尺寸、钢套尺寸、芯杆尺寸、装粉重量、松装高度,进行装粉、压制,压制完成后对压坯产品进行脱模。
本具体实施方式制备的钨合金产品比不加芯杆的产品致密化程度高,产品性能较好,材料利用率高,成本低,采用该方法实现钨合金大制品的生产,具有以下技术优势:
(1)降低原材料的投入成本;
(2)减轻产品重量,运输和吊装拆卸过程较为方便;
(3)在后续的机加工序中减少了切削量,提高生产效率,降低生产成本;
(4)生产的毛坯料一致性比较均匀,进一步减小加工余量的尺寸。
综上,本发明简单、便捷,能有效提高粉末冶金钨合金原材料的利用率,为后续的机加工序节约加工时间,提高后续机加工序的生产效率,降低成本,提高经济效益,具有广阔的市场应用前景。
实施例1:一种带通孔或者盲孔钨合金大制品的制备方法,生产牌号、规格为:φ340×φ246×358mm的95WNiFe钨合金产品,其生产步骤为:
(1)称取原材料:钨粉、镍粉、铁粉、钴粉、锰粉,混合,混合粉中钨质量百分比含量为95%,镍粉与铁粉的的质量百分比为Ni:Fe=4:1;钴粉与镍粉的质量百分比为Co:Ni=0.35%:1,Mn为0.05%,将上述混合原料加入球磨机中混合16h;
(2)胶套尺寸内径为φ432×500mm,壁厚为6.0mm,钢套内径尺寸为:φ448×400mm,壁厚为8mm,芯杆尺寸为φ291×φ273×510mm铝材,松装高度为510mm,装粉重量为330kg;
(3)采用650型冷等静压机进行压制成型,压力为200MPa,保压时间为3min,通过3次保压2次卸压,来确保产品无裂纹,无掉角,确保产品完好性;压制完成后,产品压坯尺寸为:φ403×φ292×460mm,直径方向一致性较好,上、中、下相差不超过5.0mm,
(4)脱模:取出芯杆,对压坯产品进行吊装;
(5)采用真空度<10-з的卧式真空炉来烧结,一次烧结温度为1420℃,保温时间为40min,二次烧结温度为1490℃,时间为45min。
烧结后产品尺寸为φ343×φ247×360mm,直径方向相差不高过5.0mm,满足设计要求,同时相较于实心圆柱需要的588.0kg投料,加芯杆后能大幅节省原材料258.0kg,降低生产成本。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (6)
1.一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,其步骤为:
①称取原材料:钨粉、镍粉、铁粉、钴粉、锰粉,并对原材料进行球磨;
②设计胶套和芯杆模具:胶套(1)采用橡胶套,芯杆(2)采用铝杆,胶套(1)外加钢外壳(3),钢外壳(3)外侧焊接有吊环(4),模具底部为固定圈(5);
③成型:将混合粉(6)通过胶套及芯杆模具在冷等静压机中成型;
④脱模:先取出芯杆,再对压坯产品进行吊装;
⑤烧结:采用真空炉对成型压坯产品进行二步法烧结。
2.根据权利要求1所述的一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,所述的步骤①中钨粉的费氏粒度为2.0-4.0μm,镍粉的费氏粒度为2.0-4.0μm,铁粉费氏粒度为5.0-8.0μm,钴粉的费氏粒度为0.9-2.0μm;原材料中钨粉的质量分数为80.0-97.0%;镍粉与铁粉的质量百分比为Ni:Fe=(1.5-4):1;钴粉与镍粉的质量百分比为Co:Ni=(0.6-1.0):1;锰粉的质量分数为0.02-0.06%。
3.根据权利要求1所述的一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,所述的步骤①中原材料的球磨时间为6-22h,球料比为1.5:2.0。
4.根据权利要求1所述的一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,所述的步骤②中芯杆(2)的径向收缩系数为1.25-1.34,轴向收缩系数为1.08-1.1,芯杆脱模角为0.5-1.0°,芯杆(2)上设置有一个方便脱模的M8-M14的螺纹。
5.根据权利要求1所述的一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,所述的步骤③成型压力为165-200MPa,保压2-10min。
6.根据权利要求1所述的一种带通孔或者盲孔钨合金大制品的制备方法,其特征在于,所述的步骤⑤中真空炉的真空度<10-3,一次烧结温度为1350-1500℃,二次烧结温度为1400-1600℃,烧结时间为30-65min。
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