摘要:
汽车中使用粉末治金连杆已有十几年。迄今为止,都是用粉末锻造工艺生产的。粉末锻造工艺比较昂贵,较适合于小批量生产,或制造高负荷与高速发动机的连杆。对于大批量生产的,速度不高于7000rpm的2.0L以下的发动机的连杆,可用较经济的压制-烧结-精整-热处理工艺和"断裂剖分法"制造。在欧共体COST503计划中,瑞典、英国和德国的汽车制造厂、粉末生产厂、粉末治金零件生产厂及高等学校共同承担了二个合作开发项目,旨在地用上述工艺制造重量最佳的,在1.8/2.0lOHC发动机中工作可靠的连杆。研究结果表明,用上述工艺制造的二种烧结钢连杆都已达到了现在生产的铸造连杆的疲劳强度,在发动机中工作可靠。
Abstract:
Connecting rods are becoming on increasingly high volume market for the powder metallurgy industry. At present the Components are powder forged. Many efforts have been made recently to develop a single-sintered Connecting rod. Within the scope of the European Community's COST 503 program,two cooperative projects were undertaken with Swedish,British and German partners,with the aim of developing single-sintered and weight-optimized connecting rods for relialble operation in 1.8 to 2.0 litre automotive engies. The fatigue strength behaviour obtained with single-sintered connecting rods is equivalent to that of the present used optimized cast connecting rods. The performed engine test runs proved that reliable operation is assured.
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