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Device And Method For Common Errors Of Bearing
Device And Method For Common Errors Of Bearing
The Practical Installation Method Of Skf Combined Bearing Is Worth Seeing
The Practical Installation Method Of Skf Combined Bearing Is Worth Seeing

This Paper Briefly Introduces The Characteristics Of The New Bearing Grinding Process

Bearing is an important component in contemporary mechanical equipment. Its main function is to support the rotating body of mechanical NTN bearing, reduce the friction coefficient in its movement and ensure its rotation accuracy. Rolling bearing is generally composed of outer ring, inner ring, rolling element and cage. In bearing production, grinding is complex in the whole machining process. Therefore, for grinding, one of the key processes in bearing production, how to use new processes and technologies to complete the grinding process with high precision, high efficiency and low cost is the main task of grinding.

1、 Characteristics of new bearing grinding
(1) Grinding technology of high speed bearing

High speed grinding can achieve the two goals pursued by modern manufacturing technology and improve quality and efficiency. In high speed grinding, the grinding wheel should not only have sufficient strength, but also ensure good grinding performance in order to obtain high grinding effect.

(2) New bearing grinding and sanding

Due to the good machining characteristics of cubic boron nitride wheel, the manufacturing technology, dressing technology, special bearing grinder and grinding oil of new grinding wheel are being upgraded to meet the progress of grinding process.

(3) Numerical control technology of bearing grinding

Numerical control technology can ensure positioning accuracy at high speed and low speed, and can complete fast jump, fast trend, dressing compensation and coarse and fine grinding, which greatly simplifies the feed mechanism of the machine tool and greatly improves the performance and reliability.

This Paper Briefly Introduces The Characteristics Of The New Bearing Grinding Process
2、 Scheme of new bearing grinding
(1) Clamping method of bearing

During bearing grinding, the large outer circle and process angle after correcting the accuracy can avoid the axial runout of the grinding of the middle hole seat surface.

(2) Cutting allowance of bearing

Cutting allowance is an important parameter to ensure high efficiency and high precision bearing grinding. Usually, the fine grinding allowance is controlled at the micron level.

(3) Selection of grinding tools for bearings

Modern grinding technology adopts high-speed grinding to ensure that the grinding debris will not stick to the grinding wheel and maintain good self sharpening.

(4) Grinding speed of bearing

The rotation speed of the workpiece is related to the diameter of the grinding surface of the bearing. The rotation speed of the workpiece will have a great impact on the grinding mark and surface roughness. Too low rotation speed will produce ripples on the grinding surface and increase the surface residual stress. Too high rotation speed will cause burns on the grinding surface.

3、 Problems of new bearing grinding
(1) Bearing accuracy problem

Bearing accuracy is mainly formed by the combination of machine tool accuracy, fixture accuracy and grinding process parameters. Therefore, reasonably determining the grinding coordinate of NC machine tool, the grinding wheel correction coordinate and the position of fag bearing are also important parameters to promote the workpiece quality.

(2) Bearing burn problem

In the process of bearing grinding, the phenomenon of grinding burn will occur if the process parameters are unreasonable or the dimensional accuracy of the blank is not well controlled. The main factors of grinding burn include low linear speed of the grinding wheel, low cutting force, large normal force on the surface of the grinding wheel and workpiece, etc.

(3) Bearing crack problem

When the grinding parameters are unreasonable, cracks or fine cracks will appear on the grinding surface of the middle hole seat surface after grinding, especially the cracks at the pressure chamber of the seat surface will cause cavitation corrosion at the front edge of the seat surface and reduce the fatigue strength of the bearing.

4、 Selection of new grinding oil
(1) Extreme pressure performance of grinding oil

The special grinding oil contains vulcanized extreme pressure anti-wear additives, which can effectively protect the abrasive tools and improve the process accuracy.

(2) Chemical properties of grinding oil

The special grinding oil has good chemical stability and will not harm the equipment, human body and environment.

(3) Other properties of grinding oil

The special grinding oil has passed strict tests in viscosity, flash point, pour point and thermal conductivity to meet various process requirements.

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