C41-750空气锤皮带轮(见图1)材料为灰铸铁,使用中轴孔键槽拉伤,孔径磨损约比原尺寸加大0.5毫米(约为φ85.5毫米)。由于该空气锤皮带轮内已有同轴径的轴承,所以对该皮带轮轴孔磨损只能进行堆焊。我们选定将键槽开在与原位置成90°的新位置的堆焊修复工艺,现将用铸铁冷堆焊皮带轮轴孔的工艺介绍如下。一、堆焊前准备 1.用汽油清洗反带轮轴孔,然后再用氧-乙炔焰烘烤轴孔,以清除渗入铸铁内的油污杂质。 2.选用直流焊机,正极性接法。采用直径3.2毫米的铸108焊条,电 C41-750 air hammer pulley (see Figure 1) The material is gray cast iron, the use of the central axis keyhole strain, aperture wear about 0.5 mm (about φ85.5 mm) larger than the original size. As the air hammer pulley already has a coaxial diameter bearing, so the pulley shaft wear can only be surfacing. We have chosen to open the keyway 90 ° to the original location of the new welding repair process, now cast iron cold welding pulley shaft hole process is as follows. First, pre-welding preparation 1 with gasoline anti-belt wheel shaft hole, and then use oxygen - acetylene flame bake shaft hole to clear the oil infiltration of cast iron impurities. 2. Selection of DC welding machine, the positive connection. Using a diameter of 3.2 mm cast 108 electrode, electricity