What are the methods to prevent quenching crack of slewing bearings?

Cracks sometimes occur in the slewing bearing during quenching or at room temperature after quenching.Also called quenching crack of slewing ring.There are many reasons for quenching cracking of swing bearing. When analyzing quenching crack, it should be distinguished according to the crack characteristics of slewing bearing.Today, small editor to give you a key introduction to prevent swing bearing quenching crack methods.Let's study together!

1. Proper design of slewing bearing products - the design should be based on the working conditions, service requirements and reasonable design of the section size of swing bearing, correct selection of materials, in the structural design, as far as possible to meet the requirements of heat treatment technology on the slewing ring structure;

2. Reasonable arrangement of the slewing bearing process - when the material, structure and technical conditions of the slewing ring are determined, the technical personnel shall carry out the process analysis and determine the reasonable process line. Correctly arrange the sequence of preparation, heat treatment and heat treatment. This is the main effective way to prevent the cracking tendency of the track after heat treatment.

3. The selection of quenching medium for slewing ring - the selection of quenching medium shall take into account the following factors:

(1) Slewing bearing characteristics: the chemical composition (phase change characteristics) of steel, the section size of the workpiece, the geometric shape, the surface roughness and the surface state of the workpiece, the arrangement and density of the raceway during quenching, etc.;

(2) Quenching method: including quenching tank liquid, stirring speed, flow direction and concentration of solution.

4. Select the proper quenching method of slewing bearing - according to the structure, characteristics and technical requirements of slewing ring, the correct and reasonable selection of quenching method of turntable bearings, such as the structural design condition and the quality of workers, can greatly reduce or avoid the occurrence of cracking accidents.

5. Properly determine the heating parameters of the slewing bearing- improper heating is the main factor causing the crack of the slewing ring raceway in the heat treatment of the rotary support track. Therefore, proper selection and design should be made for heating parameters such as heating medium, heating speed, heating temperature and heat preservation time.

6. Other measures to prevent quenching cracks - timely tempering after quenching (generally low temperature tempering), and local wrapping of thin wall of complex parts can also effectively prevent cracks.

The above are the six methods for preventing quenching crack of slewing bearings. We must study them carefully and apply them in operation. Share it with your friends!You can also visit FRB Bearings. We look forward to your visit!