论文部分内容阅读
目前国内排气门锥面强化工艺大致有三种一等离子堆焊、真空感应堆焊和真空溶烧.而“真空措施”较多地为行组成员厂所接受。 无论是真空感应或真空熔烧,它们的区别主要在于加热方式的不同,而在气门的予处理和合金粉末涂敷方面则无大的区别。真空堆焊产生缺陷的原因除了其他一些参数外,涂敷质量好坏也是重要因素之一。 原始的涂敷方法是将合金粉末用粘接剂调匀后,手工将膏状粉末逐段填入气门锥面槽形内。明显的缺点是:涂复效率低,劳动强度大,合金粉末内部有可能保留微小空穴,而造成烧结气孔;涂敷量不能控制,造成加工余量过多,浪费合金粉。 针对上述问题,我厂采用了手工压型模,经过使用,效果较好,初步解决了上述几个问题。模具结构见图1。
At present, there are roughly three kinds of plasma surfacing, vacuum induction surfacing and vacuum burning burning in the cone exhausting process of the exhaust valve in the country, while “vacuum measures” are more accepted by the line group members. Whether vacuum induction or vacuum melting, the difference between them is mainly based on different heating methods, and in the valve pretreatment and alloy powder coating is no big difference. The causes of defects in vacuum surfacing Among other parameters, the quality of the coating is also one of the important factors. The original coating method is to mix the alloy powder with an adhesive, hand-paste the powder into the cone section of the valve slot. Obvious shortcomings are: coated with low efficiency, labor-intensive, alloy powder may retain tiny holes inside, resulting in sintering pores; coating amount can not be controlled, resulting in excess allowance, waste of alloy powder. In response to the above problems, I plant using manual pressure form, after use, the effect is better, the initial solution to the above problems. Mold structure shown in Figure 1.