在1975年吉林省四平市召开的全国收割机刀片质量攻关经验交流会议后,按照会议精神,我们设计了1976年齿纹参数正交试验方案,并在黑龙江兵团二机厂、齐齐哈尔农业机械配件厂以及开封联合收割机厂、通县收割机厂的大力协作下,先后试制了两批76.1型～76.4型等四种试验刀 In 1975, held in Siping City, Jilin Province, the national harvester blade quality exchange experience after the meeting, in accordance with the spirit of the meeting, we designed a 1976 orthogonal parameters tooth pattern test program, and in Heilongjiang Corps II Machine Factory, Qiqihar Agricultural Machinery Parts Factory And Kaifeng combine harvester factory, Tongxian harvester plant under the strong collaboration, has trial-produced two batches of 76.1 type to 76.4 and other four test knife