How to improve the machining accuracy of the inner and outer rings of the double row ball slewing ring raceway through quality inspection?

What is a 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.

How to improve the machining accuracy of the inner and outer rings of the double row ball slewing ring raceway through quality inspection?

To improve the machining accuracy of the inner and outer rings of the double row ball slewing ring through quality inspection, we can start from improving the testing process, strengthening data analysis and improving the quality of personnel, as follows:

Improve the testing process

Pre-processing inspection

Raw material inspection: Strict inspection of the purchased steel, including chemical composition analysis, hardness testing, metallographic structure inspection, etc., to ensure that the raw materials meet the requirements and prevent deviations in processing accuracy caused by material problems. For example, uneven material hardness can lead to inconsistent tool wear during cutting, affecting raceway surface quality and dimensional accuracy.

Tooling and fixture inspection: Before clamping the workpiece, carefully check the accuracy and integrity of the tooling fixture. For example, check whether the positioning surface of the fixture is worn and whether the clamping device is reliable, etc., to ensure that the tooling fixture can accurately clamp the workpiece, and provide prerequisites for ensuring machining accuracy.

In-process inspection

First article inspection: The first piece of each batch of workpiece processing needs to be comprehensively tested, including the dimensional accuracy, shape accuracy, position accuracy of the raceway, etc. If the first piece is unqualified, the processing parameters or equipment need to be adjusted in time until the first piece is qualified before mass production to avoid batch processing errors.

Process inspection: In the process of batch processing, regular inspections are carried out, and the key dimensions and accuracy indicators of the raceway are sampled at certain intervals or after a certain number of workpieces are processed. For example, use calipers, micrometers and other tools to measure the diameter of the raceway, use a dial gauge to detect the runout of the raceway, and find out the possible accuracy changes in the processing process in time for timely adjustment.

Post-processing inspection

Full inspection of finished products: 100% full inspection of the processed inner and outer ring raceways, and comprehensive testing of various accuracy indicators of the raceways in accordance with relevant standards and technical requirements, including dimensional accuracy, shape accuracy, position accuracy and surface roughness. Only products that meet the requirements of all indicators can be judged as qualified products and enter the next process or warehousing.

Visual inspection: In addition to accuracy inspection, the appearance of the raceway should also be inspected to see if there are scratches, bumps, cracks and other defects. These cosmetic defects, which can affect the performance and service life of slewing rings, also need to be identified and dealt with in a timely manner.

Enhance data analysis

Establish quality data files: Establish quality data files for each batch of products, and record the data in the testing process in detail, including raw material testing data, first article inspection data in the processing process, inspection data and finished product testing data. These data will be used as an important basis for product quality traceability and analysis.

Data analysis and feedback: Analyze quality data regularly, and use statistical analysis methods, such as mean-standard deviation control charts, process capability analysis, etc., to find out potential problems and rules in the processing process. For example, if it is found that the roundness error of the raceway has a continuous upward trend in a certain period of time, it may be found that it is caused by the wear of the grinding wheel through analysis, and the problem can be solved by replacing the grinding wheel and adjusting the grinding parameters in time. At the same time, the analysis results are fed back to the production department and technical department to provide a basis for improving the processing technology and equipment.

Improve the quality of personnel

Training of testing personnel: Regularly organize testing personnel to participate in professional training, learn new testing technologies and methods, be familiar with the operation and maintenance of various testing equipment, and improve the professional skills and business level of testing personnel. For example, carry out the operation training of high-precision testing equipment such as coordinate measuring instrument and roundness meter, so that inspectors can accurately use the equipment for detection and correctly analyze and process the detection data.

Quality awareness training: Strengthen the quality awareness training of inspectors and production personnel, so that they can realize the importance of processing accuracy to product quality and performance. By carrying out quality training, quality month activities, etc., we will create a good atmosphere for all employees to pay attention to quality, so that each employee can strictly abide by the quality standards and operating procedures in their work, and reduce the generation of processing errors from the source.

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.