结果表明，由于球化不良而产生的不均匀带状碳化物是造成气门电镦质量问题的重要因素之一。
The results show that the uneven distribution banded carbide due to abnormal spheroidization is one of important factors causing the quality problems of the valves after electric upsetting.
以170f柴油机为例，建立单质量、二质量和四质量三种配气机构动力学模型，并相应进行气门动态特性试验研究。
A 170f diesel valve train was taken as example, one-mass, two-mass and four-mass models were built and the valve dynamic characteristics experiment was also carried out accordingly.
济南航发气门有限公司的诚信、实力和产品质量获得业界的认可。
Jinan air hair valve co., LTD. The good faith, the strength and the product quality in the industry for approval.
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