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铁道车辆制动瓦应有优良的摩擦性能和耐磨性,良好的导热性和耐热性,磨擦时不易产生火花以及必要的强度性能等,此外不应引起车轮缘摩擦面过高和不均匀的磨损。经研究证明,磷合金铸铁基本能满足上述要求,用钒进行合金化还可改善磷铸铁的性能。研究了含P0．O3—0．36%,0．79—0．9%和2．87—3．1%,含V0． 04—0． 27%的磷铸铁的显微组织,机械性能,耐磨性和摩擦特性。试验制动瓦化学成分列于表1。按标准方法对铸铁的机械性能进行试验,用自动瓦在500吨压力机上进行试验,操作时将铸件的吊耳固定在压力机中两个计算距离为300毫米的金属支座上面。
Brake shoes should have excellent rail friction and wear resistance, good thermal and heat resistance, friction is not easy to produce sparks and the necessary strength and performance, in addition, should not cause the rim friction surface is too high and uneven Wear and tear. The study proved that phosphorus alloy cast iron can basically meet the above requirements, alloying with vanadium can also improve the performance of phosphorus cast iron. Studied with P0. O3-0.36%, 0.79-0.9% and 2.87-3.1%, with V0. 04-0. 27% of the phosphorus cast iron microstructure, mechanical properties, wear resistance and friction characteristics. The chemical components of the tested brake shoes are listed in Table 1. The mechanical properties of cast iron were tested according to standard methods. The test was carried out on a 500-ton press using an automatic tile. The lugs of the castings were fixed on two metal supports in the press measuring 300 mm from the press.