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Heat treatment for slewing bearing
  • The thermal processing link is indispensable for the working of a slewing bearing. It is crucial to thermally process the pulley part of the slewing bearing to ensure its proper functioning. The pulley part plays a vital role in effectively supporting all objects, making it necessary to consider various aspects during the hot processing stage. Today, we will provide you with detailed instructions on the hot processing of slewing bearings.

    In general, the hot processing of slewing bearings follows a set of correct operational procedures. The typical process steps include forging, roughing, quenching and tempering, finishing, flame surface quenching of the raceway surface, and raceway surface grinding. The flame quenching is specifically applied to one of the raceway surfaces to create a soft belt. The soft belt refers to the area that has not undergone heat treatment, and its formation is essential for the heat treatment process. Due to the relatively large diameter of the raceway circle in slewing bearings, flame surface quenching is commonly employed. This method involves heating the workpiece's surface with acetylene and then rapidly cooling it with water. The process is performed continuously by moving the heated flame gun and water gun along the circle of the workpiece.

    When the movement approaches 360 degrees, the heating and water spray must be immediately halted. The circular areas of heating and water spray should not overlap, as overlapping can lead to cracks in the workpiece (heat treatment at an angle greater than 360 degrees on the circle). The tangential width of the unheated area, known as the soft belt in the slewing ring, is typically 15 mm. The specific position of the soft belt is usually marked with the letter "S" on the workpiece, which is a crucial indication found in both imported and domestically produced standard products.

    The precautions for the slewing bearing during the hot working process align with the information we provided earlier. It is essential to be attentive and follow these precautions uniformly to ensure the correct operation of the pulley part in the slewing bearing.