Ball bearings reduce vibration noise to improve the technology

At present, China deep groove ball bearings and seal products advanced parameters are almost the same internal structure, but such products in China the level of vibration and noise are very different and foreign products, mainly in the manufacturing and working conditions and factors. From the bearing industry perspective, condition factor may make reasonable requests to resolve the host, but how to reduce the manufacturing-induced vibration and noise is the bearings industry must be addressed.
　　
Many domestic and international tests show that: the cage, ring, ball bearing vibration processing quality of different degrees, of which the processing quality of ball bearing vibration on the most significant, followed by the ring of processing quality, the main effect factor is the ball and ring roundness, waviness, surface roughness, surface bump hurt so.
　　
Ball products in China's most prominent problem is the value of discrete vibration large, severe surface defects (single point, cluster points, pits, etc.), even though the surface roughness, size, shape, standard error of no less than outsiders, but together cover After the bearing vibration value is high, and even produce different sounds, the main problem is that there is no waviness control (non-standard and appropriate analytical instrumentation), explaining the vibration machine, poor wheel of the lapping plate, coolant, process parameters have a problem ; on the other hand to improve the management level, to avoid the bump hurt, scratches, burns and other machines of quality problems at any time.
　　
For rings, the most serious impact of bearing vibration is channel waviness and surface roughness. For example, the small and medium sized deep groove ball bearings inside and outside the channel is greater than 2μm circle, the vibration of bearings will be obviously affected by internal and external channel ripple is greater than 0.7μm, the bearing vibration value with the increase of waviness, a serious channel 4dB increase of vibration injury knock over, or even different tone.
　　
Both balls or rings, waviness resulting from grinding, Superfinishing Although it can improve the waviness and roughness decreased, but the most fundamental measure is to reduce the ultra-fine grinding process of waviness, to avoid random bump hurt, there are two main measures:
　　
First, reduce the rolling surface of the vibration when the ultra-precision grinding, get a good surface finish quality and shape accuracy and surface texture to reduce vibration, grinding machine to be super good vibration resistance, and other important structural parts bed with absorber, super precision machine tools whetstone oscillation system with good anti-vibration performance; increase grinding speed, grinding abroad outside 6202 60 000 commonly used roller spindle, grinding speed of 60m / s or more, domestic general much lower, mainly due to spindle and the main bearing performance limits. In the high-speed grinding, the grinding force is small, thin grinding deterioration is not easy to burn, but also can improve the machining accuracy and efficiency
Low-noise ball bearing great influence; spindle static and dynamic characteristics of stiffness and speed of ball bearings for low noise, vibration grinding a great influence on the stiffness and the grinding speed on the grinding force changes in the less sensitive the more grinding system vibration small; increased spindle bearing support stiffness, random balancing technology to improve the vibration of grinding spindle. Foreign grinding vibration speed (such as Gamfior) is about one-tenth of the domestic general spindle; improve the cutting wheel Whetstone and dressing quality is essential. My main problem now is the whetstone wheel structure heterogeneity of the serious
Affect low-noise ball bearings processing quality; adequate cooling, improve filtering accuracy; improve fine feed to the system resolution, and lower feed inertia; reasonable process parameters for grinding and processing of ultra-process elements can not be ignored, grinding remaining amount is smaller, geometric tolerances and strict, medium and small diameter ball bearings should not use Superfinishing, ultra-fine grinding of crude should not be split to ensure good surface quality.
　　
Second is to improve the processing base-level accuracy, reduce processing mill ultra error reflection in diameter and ends are super-grinding positioning processing benchmark. Ultra-fine diameter of the channel of Error diameter of the groove by grinding, groove grinding on the groove over the error reflection indirect transmission. If the parts produced in the transmission of injury bump, it will directly reflect to the raceway complex processing of the surface, the impact of bearing vibration. Therefore, we must take the following measures: improve the positioning reference surface form accuracy; smooth processing of transfer, no bump injury; rough amount of form and position errors can not be left too large, especially in the remaining amount is small,
Error will cause excessive wear and ultra-precise final shape of the end of the accuracy has not improved to the final quality requirements, severely affect the processing quality consistency.
　　
Is not difficult to see from the above analysis: from high-performance, high stability machine system approach consisting of automatic line grinding and superfinishing processing low-noise ball bearing the most appropriate, to avoid bump injury, reduce transmission errors, eliminate Rengong factors, improve processing efficiency and quality consistency and reduce production costs and improve enterprise efficiency.
　　
How to reduce noise ball bearing it? Efforts from the following two aspects:
　　
(A) of the manufacturing process. Refinement process, mainly referring to process as short as possible, processing of the merger process, the production without intermediate stock, reduce the performance impact of low-noise ball bearing technology factors; production of clean technology, which is a system of techniques, including grinding fluid, super- semen, cleaning fluid, air, high pressure air, production technology and environmental technology; automation, processing to the assembly from the car the whole process of automation, small or unmanned; scale, these bearings especially quiet ball bearing, must form a large scale can have global market competitiveness.
　　
(B) of the equipment. High speed grinding spindle accuracy, stiffness, life and protection of all improve the detection performance of grinding accuracy and efficiency play a major role; grinding technology, foreign internal grinder usually have a high-speed grinding, AC servo control, feed resolution of 0.25μ, fully automatic operation, the self-diagnostic function; ultra-precision technology, mainly Seiki, Osaka, Japan, represented by the two-position inadvertently supporting ultra-precision and in Germany Thielenhaus Centering represented by four hydraulic works bit ultra-precision two ways; online testing technology, the twentieth century since the eighties,
Japan Bearing Industrial measuring machine outside the active feedback control of the automatic grinding and ultra-short-term application of the most common. Posed in this way in China autoline applications are relatively mature, there are 100 or so domestic. With the advanced industrial countries, the host technology continues to improve, more and more simple line, and gradually reduced or no active measurement and testing outside the machine; Centerless cylindrical grinding machine, round things (KOYO, MIKROSA, etc.) commonly used grinding wheel spindle bearing unit, with high rigidity, high precision, long life, easy handling, use and reliable series of advantages; bed with the damping characteristics of attenuation reduction; into a high-precision micro servo system
Systems, AC variable frequency drive and stable guide wheel adjustment system, with online random intelligent measurement, enables CBN grinding wheels, etc., can be automated on-line, roundness up to 0.3μm, size dispersed up to 3μm.
　　
Surface grinding machine, foreign double-ended (eg, KOYO, Landis Gardner) surface grinding machine spindle is a commonly used high-precision, high-rigidity unit wheel spindle bearing axle system, oil mist lubrication. By Gardner technology, for example, production systems and equipment of the company has 90 years of history, may be grinding bearings, <> ceramics and other materials. Main automatic wheel dressing and compensation, wheel grinding head screw into the coaxial give servo motor, grinding wheel speed synchronized to the internal and external feed, the feed accuracy can be 0.25μm, body bearers placed in two levels and balance device, the balancer has a self-balancing support rod,
Can automatically adjust the level with the two pads into a horizontal plane, so that machines have a solid supporting effect of grinding wheel balancer shaft key is to maintain concentricity, increased time between finishing grinding wheel and workpiece feed a rotating, reciprocating, through style and a special four forms, can use the super-abrasive grinding wheels, diamond and CBN grinding wheel, grinding and high precision, good stability and extremely long service life and ease of operation of wheel adjustment, can be formulated according to specific processing requirements of abrasives, bonds , structure (ring, button-shaped or links like), so as to achieve the best grinding results, parallel error and flatness up to 1μm.

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