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对拖拉机上配合件实行按尺寸分组,其目的是在配件生产中能够以不太高的加工精度得到比较理想的装配精度,从而降低加工过程的废品率。这对制造单位来说是比较经济合理的,但是,从另一个角度看却给供应、修理和使用单位带来极大的麻烦和浪费。也是造成机械完好率低的一个原因。拖拉机不同其他机械,它机型多,数量大,分布广,利用率高,配件的使用寿命短,供应环节又比较复杂,在大量的农机修理中要选配一套尺寸分组相同的配件是不太容易的。以东方红—75拖拉机为例,标准缸筒的公称尺寸为(?)125,实际分为(?)125_(+0.01)~(+0.03)、(?)125_(+0.03)~(+0.05)、
On the tractor with the implementation of the size of the sub - group, the purpose is to produce parts in the production of less high precision can be more accurate assembly accuracy, thereby reducing the processing scrap rate. This is more economical and reasonable for the manufacturing units. However, from another perspective, it has brought enormous troubles and waste to the supply, repair and use of units. Is also caused by a low rate of mechanical integrity of a reason. Tractors different from other machinery, it is more models, the number of large, widely distributed, high utilization, parts life is short, the supply chain and more complex, in a large number of agricultural machinery repair to match the size of a set of the same accessories are not Too easy Taking the Dongfanghong-75 tractor as an example, the nominal size of the standard cylinder is (?) 125, which is actually divided into 125? + 0.01? +0.03? 125 + 0.03 + ),