Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient in the process and ensure its accuracy. Rolling bearings generally consist of four parts: outer ring, inner ring, rolling body and cage. Grinding is the most complicated process in the whole bearing manufacturing process, so how to finish the grinding process with high precision and high efficiency is the main task of grinding for one of the key processes in the bearing. What are the characteristics of the new bearing grinding process:
I. Characteristics of New Bearing Grinding
(1) High-speed bearing grinding process
High-speed grinding improves quality and efficiency. In high-speed grinding, besides sufficient strength, good grinding performance should be ensured.
(2) New bearing grinding and sanding
The manufacture, dressing, special bearing grinding machine and grinding oil of new type of sand mill meet the progress of grinding technology.
(3) bearing grinding CNC use
The numerical control machine tool can ensure accuracy at both high speed and low speed, and can complete fast jumping, fast driving, trimming, rough and fine grinding.
Second, the new bearing grinding scheme
(1) Bearing clamping method
When grinding the bearing, the large excircle and process angle after correction of precision can avoid the grinding runout of the central hole seat surface.
(2) cutting allowance of bearing
Cutting allowance ensures high-efficiency and high-precision bearing grinding. Usually, the fine grinding allowance is in microns.
(3) Selection of grinding tools for bearings
High-speed grinding is adopted to ensure that the abrasive dust will not stick and block during the grinding process and maintain good self-sharpness.
(4) bearing grinding speed
The rotating speed of the workpiece is related to the diameter of the grinding surface of the bearing. The rotating speed of the workpiece will greatly affect the grinding cut and surface roughness. A low rotating speed will cause ripples on the grinding surface and increase the residual stress on the surface. A high rotating speed will cause burns on the grinding surface.
Three, the new bearing grinding problem
(1) bearing accuracy
Bearing accuracy is mainly formed by machine tool accuracy, fixture accuracy and grinding process parameters. Therefore, it is also an important parameter to reasonably determine the grinding value of CNC machine tools.
(2) bearing burns
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 causing this kind of grinding burn are low linear speed of grinding and low cutting force.
(3) bearing crack problem
When the selection of grinding parameters is unreasonable, cracks or fine cracks will occur on the grinding surface of the central hole seat surface after grinding, especially the cracks at the seat pressure chamber will cause cavitation on the front edge of the seat and reduce the fatigue strength of the bearing.
Four, the selection of new grinding oil
(1) Extreme Pressure Performance of Grinding Oil
Special grinding oil contains sulfurized extreme pressure antiwear additive, which can effectively protect grinding tools and improve process accuracy.
(2) Chemical Properties of Grinding Oil
Special grinding oil has good chemical stability and will not cause harm to equipment, human body and environment.
(3) other properties of grinding oil
Special grinding oil has passed strict tests in viscosity, flash point, pour point and thermal conductivity to meet various technological requirements.
The above is the treatment plan after the metal grinding process goes wrong. High-quality raw materials are the premise to obtain good grinding quality. In addition, the grinding process precision is closely related to the workpiece surface condition and heat treatment process.
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