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在国内外的铁路运输中都越来越广泛地采用合成闸瓦。无论是国产还是外国的合成闸瓦都是由钢背和在它上面压制成型的非金属摩擦材料构成的。钢背是供增强合成闸瓦和将合成闸瓦固定在车辆的闸瓦托上用的。钢背一般是由2～4毫米的钢板用冲压的方法制成的形状十分复杂,并且通常是由几个零件用电焊接而成的。苏联大批量生产的闸瓦的瓦背重量约
Synthetic brake shoes are increasingly used in railway transportation both at home and abroad. Both domestic and foreign synthetic brake shoes are made of steel back and pressed non-metallic friction material on it. The steel back is used to reinforce the synthetic brake shoe and secure the synthetic brake shoe to the brake shoe of the vehicle. Steel back is generally made of 2 to 4 mm steel plate by stamping method is very complex shape, and is usually composed of several parts welded together. The bulk of the Soviet Union’s brake shoe tile weight back about