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Progressive ball bearing vibration and noise reduction skills and process equipment

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At present, the internal groove layout parameters of deep groove sealed ball bearings in China are almost the same as those of foreign leading companies; however, the oscillation and noise levels of such products in China are far from the foreign products; the primary reason is the influence of production and working conditions. Thinking from the bearing professional point of view; the working condition elements can make reasonable demands on the host to deal with; and how to reduce the oscillation and noise caused by the production factors is a difficult problem for the bearing profession.
Many experiments in the national watch indicate that the processing quality of the cage, the ferrule and the steel ball have different effects on the bearing oscillation; the processing quality of the steel ball has the most significant influence on the bearing oscillation; the second is the processing quality of the ferrule; The most important influencing factors are the roundness, waviness, appearance roughness, and appearance of steel balls and ferrules.
The most outstanding problem of steel ball products in China is that the oscillation value is discrete; the external defects are severe (single point, group point, pit, etc.); although the appearance roughness, scale, shape, and error are not lower than the foreign level; The bearing oscillation value is high; even the noise occurs; the first problem is that the waviness is not manipulated (no specification, no suitable profiling instrument); together, the vibration resistance of the machine tool is poor; the grinding wheel, the grinding disc, the coolant, and the process parameters are all difficult. On the other hand, it is necessary to improve the management level; to prevent bumps, scratches, burns, etc. with the opportunity quality problems.
Regarding the ferrule; the most severe impact on the bearing oscillation is the channel waviness and appearance roughness. For example; when the circularity of the channel in the small and medium-sized deep groove ball bearing is greater than 2μm; it will have a significant impact on the bearing oscillation; When the waviness of the track is greater than 0. 7μm; the bearing oscillation value is added with the addition of waviness; the severe channel damage can increase the oscillation by more than 4dB;
Whether the steel ball is still a ferrule; the waviness occurs in the grinding process; although the ultra-finishing can improve the waviness and reduce the roughness; the most basic method is to reduce the waviness during the grinding process; prevent random Sexual bruises; there are two main ways:
The first is to reduce the oscillation of the super-fine grinding when the surface is tumbling; to obtain outstanding surface shape accuracy and appearance texture as the downward oscillation; it is necessary to have excellent vibration resistance for the grinding machine; the important layout parts such as the bed have vibration absorption; The oilstone oscillating system of the ultra-precision machine tool has outstanding anti-vibration function and improves the grinding speed; the foreign grinding 6202 outer raceway uses 60,000 electric spindles; the grinding speed is more than 60m/s; the domestic is usually much lower; And the constraints of the main bearing function. In the high-speed grinding; grinding force. ハ鞅 惚 惚 蝗菀 蝗菀 蝗菀 蝗菀 耍 耍 耍 耍 耍 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀 蝗菀岫 岫 岫 斩 斩 捌渌俣 捌渌俣 捌渌俣 匦 匦 匦 匦 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髡穸跋旌艽螅桓斩 ハ髁 ハ髁 ハ髁 ハ髁 浠 浠 浠 浠 浠 浠 浠 浠 浠 浠Called. 惶岣咧 嶂岢 嶂岢 嶂岢 Ц Ц Ц Ц Ц Ц Ц Ц Ц 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 裥 国外 裥 裥 国外 国外 国外 裥 国外. The cutting function and finishing quality of the progressive grinding wheel are essential. The main problem of the current grinding wheel in China is Poor layout uniformity; severely affect the low-noise ball bearing grinding super processing quality, abundant cooling; improve the filtration accuracy, improve the feed resolution of the system; reduce the feed inertia, reasonable grinding process parameters and processing flow is not acceptable Ignore the elements; grinding and retention. Laos also friends, Xi Huixing, 饩恫 饩恫 擞 擞 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 淮 .
The second is to improve the precision of the machining reference surface; the error re-imaging outer diameter and the end surface in the falling grinding super-processing process are the positioning reference in the grinding super-processing process. The outer diameter-to-channel super-precision error mapping is through the outer diameter to the groove grinding Ditch grinding directly transmits the error of the groove super. If the workpiece is bumped during the transfer process, it will be directly reflected on the outer surface of the raceway; affecting the bearing oscillation. Therefore, it is necessary to adopt the following method: improve the positioning of the reference appearance Shape accuracy, smooth transfer during processing; no flaws, blank blank position error can not be too large; especially when the retention is small; too large errors will constitute the end of the final and superfine end of the shape accuracy is not improved to the end of the quality Demand; severely affect the consistency of processing quality.
It is not difficult to see from the above that the active line method consisting of high-function and high-stability machine tools is the most suitable for grinding ultra-low-noise ball bearings; it can prevent smashing; reduce transmission errors; remove artificial elements; improve processing power and quality Sex; lower production costs; improve company benefits.
How to reduce the ball bearing noise? The author thinks that we should try our best from the following two aspects:
(1) Production process. Process refinement; firstly, the process flow is as short as possible; process processing and merger; production without central inventory; useful decline affects the low-noise ball bearing functional process elements, production cleanliness; this is a system of skills; Including grinding fluid, super-semen, cleaning fluid, air, high-pressure air, production environment and other skills, initiative; from vehicle processing to installation process automation; few people or unmanned, planning; such bearings are especially quiet Ball bearings; it is necessary to form a big plan; talent has the global mall competitiveness.
(2) Equipped with high-speed grinding, electric spindle precision, stiffness, life and various perfect inspection and safety functions play the primary role in grinding precision and power, grinding machine skills; foreign internal grinding machines usually have high-speed grinding; Communication servo control; feed resolution 0. 25μ; full active and easy operation; self-diagnosis function, super-fine skills; firstly, the unintentional support of two stations in Japan, represented by Osaka Seiki, and the German Tierenhaus Representing the two methods of hydraulic centering and four-station super-precision, online testing skills; since the 1980s; the Japanese bearing industry is the most widely used active grinding ultra-short wire with active measurement outside the machine reaction. The use of grinding super-active lines is also more sophisticated; there are currently about 100 in China. With the advanced technology of the leading industrial countries, the skills are constantly improving; the connection is becoming more and more simple; gradually reducing or not actively measuring and detecting outside the machine, uncentered cylindrical grinding machine; Yuanwai (KOYO, MIKROSA, etc.) has selected the main shaft unit of the rolling bearing grinding wheel; it has high rigidity, high precision, long life, convenient loading and unloading, and reliable operation. The strength of the series, the bed has damping attenuation characteristics, the feed uses high-precision micro-motion communication servo system; the stable transmission communication frequency conversion guide wheel adjustment system; can have online random intelligent measurement; can complete CBN grinding wheel grinding, etc.; Active connection; roundness up to 0.3 μm; scale dispersion up to 3 μm.
Surface grinder; foreign double-end (such as KOYO, Landis Gardner) surface grinder spindles are all equipped with high-precision, high-rigidity rolling bearing spindle unit grinding wheel shaft system; oil mist is smooth. Take Gardner skills as an example; the company's research and production system has been equipped History more than 90 years ago; can be used to grind bearings, ceramics, glass, rubber, plastics, etc. The primary skills are active wheel dressing and compensation; the grinding wheel head is placed in parallel with the servo motor screw; the grinding wheel is fast to the table Synchronous feed; feed accuracy can reach 0. 25μm; the fuselage is placed on two horizontal pad balance instruments; the balancer has self-balancing support rod; can be actively adjusted to form a horizontal plane with two horizontal blocks; Stable support; balancer is to maintain the concentricity of the grinding wheel; add dressing wheel interval; workpiece feed has rotary, reciprocating, penetrating and special four ways; can use super abrasive grinding wheel; diamond grinding wheel and CBN Grinding; high precision and good stability; extremely long grinding wheel life and convenient operation adjustment; can be specially manufactured according to processing needs Materials, binders, layout (annular, segment-like or button-like); then to the optimum grinding action; and flatness of differential parallel 1μm.

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