Low-temperature cyaniding of high-speed steels in ammonia filtered through glowing coal

Conclusions Low-temperature gas cyaniding of high-speed steels in ammonia filtered through glowing coal can be controlled by varying the input of ammonia at a low temperature of the coal in the dissociation chamber (up to 650–680°C). The durability of cyanided tools of high-speed steels is increased 2–3 times by such treatment [1].Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 54–56, December, 1966.     

大型船用柴油机缸套的铸造工艺

介绍了KQZ60/105E柴油机缸套的技术要求和采用镶铸钢管来形成细长孔的方法。为了获得高质量的铸件,采用多个分型面、立式浇注、先底雨淋后上雨淋浇注等铸造工艺。同时,制芯、合型、浇注等现场生产工艺也要严格控制措施。生产表明,本文所介绍的铸造工艺是可行的。     

意大利TEKSID公司合金灰铸铁汽缸体的焊补技术

介绍了焊补缺陷的类型、可焊补的汽缸体部位、焊补工艺及焊后热处理工艺。     

方截面缸体锻造工艺的改造

方截面缸体由于锻件规格较大,在锻造过程中常常出现塌角、切斜、缺肉及端面折叠等缺陷,严重影响了产品质量及合同履行周期.本文在对缸体锻件缺陷进行观察、分析的基础上,结合生产实践,对传统的锻造工艺进行了改进和简化,改进后的工艺不但简化了操作难度,而且改善了产品的锻造缺陷,使产品的一次合格率提高到了95%,并且缸体工艺成材率也提高了5%～6%.该工艺应用于生产实践中取得了良好的效果,为企业创造了可观的经济效益.     

一种发动机气缸体气孔缺陷分析及改进

以一种发动机气缸体气孔缺陷问题为例,通过合理优化浇注系统,更改局部结构,提高排气能力等方面提出解决思路,最终将气缸体的气孔缺陷率降至较低水平。     

Effect of cyaniding on strength of high-speed steel

Conclusion Cyaniding of high-speed steel increases the brittleness and lowers the strength. The lowering of the strength is one of the main reasons for the failure of cyanided cutting tools.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 70–71, January, 1976.     

混凝土搅拌主机缸体焊接变形的分析及控制

双卧轴混凝土搅拌主机缸体在焊接过程中产生较大的变形,很难保证端板的平面度,在使用过程中容易产生砂石卡阻,致使搅拌负荷加大.本文通过分析缸体的结构特点及焊接变形原因,优化焊接工艺及采取有效焊接变形控制措施来进行缸体的焊接.实践证明:缸体的焊接变形得到了有效控制,端板的平面度控制在1.5 mm之内,满足了混凝土搅拌主机的使用要求.     

液压机主缸缸体导向块裂纹修复

采用焊接方式对液压机主缸缸体导向块裂纹进行修复,较好地解决了生产实际问题,节约成本。在修复时采用碳弧气刨对缺陷处清除,并给出了焊接工艺和方法,取得了良好效果。     

Nitriding and low-temperature cyaniding of steel 40KhNMA

Conclusion Low-temperature cyaniding increases the fatigue limit and wear resistance of nitrided steel 40KhNMA and can be recommended for parts subject to bending fatigue conditions with contact corrosion, particularly for slot couplings and clutches.Zaporozh'e Machine Construction Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, p. 59, July, 1970.