What are the effective measures to improve the machining accuracy of the raceway of the inner and outer rings of the double row ball slewing ring?

What is double row ball slewing bearing

Double-row ball slewing bearing is a slewing ring bearing that consists of two rows of balls and is used to handle a combination of axial, radial, and moment loads. This design improves the load distribution and performance of the bearing, making it suitable for heavy-duty applications. It is often used in machinery that needs to rotate effectively under large loads.

Features of double row ball slewing rings

Double-row ball slewing ring is a mechanical component used to withstand large axial forces, radial forces and overturning moments, with the following characteristics:

Strong bearing capacity: The double row ball slewing ring has two rows of steel balls, which can withstand axial force, radial force and overturning moment at the same time. Compared with the single-row ball slewing ring, its bearing capacity is greatly improved, which can meet the force requirements of large machinery and equipment under complex working conditions, such as large cranes, shield machines and other equipment, which can withstand the huge load generated by lifting heavy objects and various forces during equipment operation.

High Rotation Accuracy: Through precise machining technology and assembly technology, double row ball slewing rings can ensure high rotation accuracy. The matching accuracy of the raceway and the steel ball is high, which can make the equipment stable during rotation and reduce vibration and swing, which is very important for some equipment that requires high precision, such as radar antennas and astronomical telescopes, to ensure that it accurately points to the target and improves the working performance.

Good rigidity: The structural design of the double row ball makes it have good rigidity. When bearing load, it can effectively resist deformation and maintain the stability of the structure. This helps to improve the overall strength and reliability of the equipment, and prolong the service life of the equipment, especially in some heavy-duty and high-impact working environments, such as mining machinery, port machinery, etc., which can better adapt to harsh working conditions.

Stable operation: the steel ball rolls in the raceway, the friction resistance is small, and the distribution of the double row ball makes the load evenly distributed, so as to ensure the stability of the slewing ring in the running process. The equipment runs smoothly when rotating, reducing noise and vibration, improving the quality of the operator's working environment, while also reducing wear and impact on other parts of the equipment.

Easy installation: Double row ball slewing rings are usually designed with standardized mounting interfaces and dimensions for easy connection and installation with other parts of the equipment. Its structure is relatively compact, occupies a small space, and can achieve a large bearing capacity and rotation function in a limited space, which provides convenience for the design and manufacture of equipment.

Low maintenance cost: Due to its simple structure and reliable operation, the maintenance of double row ball slewing rings is relatively easy. It only needs to regularly check the lubrication, sealing performance and wear of components, lubricate and replace worn parts in time, which reduces the maintenance cost and downtime of the equipment and improves the efficiency of the equipment.

What are the effective measures to improve the machining accuracy of the raceway of the inner and outer rings of the double row ball slewing ring?

To improve the machining accuracy of the raceway of the inner and outer rings of the double row ball slewing ring, we can start from optimizing the processing technology, improving the accuracy of the equipment, and strengthening the quality inspection, and the specific measures are as follows:

Optimize the machining process

Reasonable planning of the processing process: formulate a scientific processing sequence, first rough machining to remove most of the margin, and then semi-finishing and finishing in turn, and gradually improve the accuracy. Leaving an appropriate allowance for each processing can not only ensure that there is enough material for precision correction in subsequent processing, but also avoid excessive allowance to increase the difficulty and time of processing. For example, a margin of 0.5 - 1 mm is left for rough turning and 0.1 - 0.2 mm for grinding for semi-finishing.

Adopt advanced processing methods: the use of CNC machining technology, through accurate programming and control system, to achieve high-precision control of raceway machining. If the CNC grinding machine is used for grinding processing, the feed, speed and grinding path of the grinding wheel can be accurately controlled by the CNC system, so as to improve the dimensional accuracy and shape accuracy of the raceway. In addition, special machining methods such as EDM can also be used to process some complex shapes of raceways to improve machining accuracy.

Optimize the heat treatment process: strictly control the heat treatment parameters such as quenching and tempering to ensure that the raceway obtains good metallographic structure and mechanical properties. For example, the quenching heating temperature is precisely controlled at 820 - 860°C, the oil cooling quenching, the tempering temperature is between 550 - 650°C, and the tempering time is 2 - 4 hours, so as to ensure that the surface hardness of the raceway reaches HRC58 - HRC62, and the core hardness is HRC30 - HRC40, so as to reduce the heat treatment deformation and improve the dimensional stability of the raceway.

Improve the accuracy of your equipment

Selection of high-precision processing equipment: investment in the purchase of advanced high-precision lathes, grinding machines and other processing equipment, these equipment has higher stiffness, stability and motion accuracy, can provide good basic conditions for raceway machining. For example, the positioning accuracy of the high-precision CNC grinding machine can reach within ±0.01mm, and the repeated positioning accuracy can reach within ±0.005mm, which can effectively ensure the machining accuracy of the raceway.

Regular maintenance and calibration of equipment: Establish a regular maintenance system for equipment, carry out daily inspection, lubrication, fastening and other maintenance work on processing equipment, and find and replace worn parts in time. At the same time, regularly calibrate the accuracy of the equipment, such as using laser interferometer, ballbar and other precision instruments to detect and adjust the coordinate axis accuracy, perpendicularity and parallelism of the machine tool to ensure that the equipment is always in the best working condition.

Strengthen quality inspection

Precision measuring instruments: equipped with precision measuring instruments such as coordinate measuring instrument, roundness meter, and profilometer to comprehensively detect the size, shape, and position accuracy of the raceway. The measurement accuracy of the CMM can reach ±0.01mm - ±0.05mm, which can accurately measure the diameter, width, cylindricity, roundness and other parameters of the raceway, find the machining error in time, and provide a basis for subsequent adjustment and improvement.

Establish a strict quality inspection system: formulate detailed quality inspection standards and processes, and carry out multi-process testing in the processing process, including first article inspection, inspection and finished product inspection. The test data is recorded and analyzed in detail, the stability of the machining process is monitored through statistical process control (SPC) and other methods, the abnormal fluctuations in the processing process are found in time, and corresponding corrective measures are taken to ensure that the machining accuracy of the inner and outer ring raceways of each slewing ring meets the quality requirements.

Control the processing environment

Maintain a constant temperature and humidity environment: Set up air conditioning system and dehumidification equipment in the processing workshop to control the temperature at 20°C±2°C and the humidity at 40%-60%. The stable temperature and humidity environment can reduce the deformation of parts caused by thermal expansion and contraction and humidity changes, and improve the machining accuracy.

Reduce vibration and noise interference: Vibration isolation treatment is carried out on the processing equipment, such as installing shock absorbing pads, vibration isolators, etc., to reduce the impact of the equipment's own vibration on the machining accuracy. At the same time, the workshop is soundproofed and noise reduced to avoid external noise interfering with the operator and ensure that he can focus on the processing process, so as to improve the processing quality.

Improve operator skills

Strengthen skills training: regularly organize operators to participate in professional training courses to learn advanced processing technology, equipment operation skills and quality control knowledge. The training content includes CNC programming, the use of precision measuring instruments, the optimization of processing parameters, etc., to improve the theoretical level and practical operation ability of operators.

Encourage technological innovation and experience exchange: Establish an incentive mechanism to encourage operators to carry out technological innovation and improve processing methods. At the same time, we organize experience exchange activities among operators, share skills and experiences in the processing process, and jointly improve machining accuracy and quality.

Supplier of double row ball slewing rings

LZTC Double Row Ball Slewing Rings provides a series of services such as R&D, design, production and sales of double row ball slewing ring products. If you are looking for a double row ball slewing ring supplier, please contact us for the latest quote.