Bearing quality testing

I. bearing quality testing standards a vibration. Vibration acceleration national standard (commonly known as the Z scale) of the earlier standards, to measure the rotation of the bearing vibration acceleration values ??to determine the bearing quality grade, divided into Z1, Z2, Z3 from low to high three quality grades. Domestic bearing manufacturers are still in use, in order to measure the bearing vibration acceleration values ??the merits, just simply reflect the bearing fatigue life. 2. Vibration velocity standard (commonly known as the V mark) since the original vibration acceleration standard has not been abolished, so that the standard is based on mechanical industry ministerial standards emerge, is the reference to European standards combined with China's actual situation and the need to develop in order to detect bearing vibration velocity divided by Bearing quality level (equivalent to the national standard). Into V, V1, V2, V3, V4 five quality levels. Various ball bearing quality level from low to high as V, V1, V2, V3, V4; roller bearings (cylindrical, conical) quality level from low to high as V, V1, V2, V3 four quality levels. It is based on detecting bearing different frequency bands (low, medium, high) to reflect the speed of the vibration b bearing quality. Bearings can be roughly analyzed whether there geometry problems (such as rims oval), roller / rolling quality problems, quality problems cage, to examine the vibration acceleration than to have a significant bearing quality improvement. Domestic exports to Europe bearing, our military and aerospace industries are in accordance with the standards for bearing quality testing, and testing the quality and resolution of the European imports of counterfeit bearings imported bearings provide a viable means. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings bearing quality testing currently exist two standard parallel situation, while "Z standard" bearing a high quality level to "V standard" detection may not have a good quality of performance, there is no correspondence between the two. This bearing quality testing is to pay special attention. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings two. Detect the vibration measuring instrument bearings used in the operation, ISO2372 standard although they are vibration velocity to determine whether the excessive vibration, but practice in the field with special attention to the bearing acceleration value changes, mostly bearing damage during the initial presentation of fatigue damage, this can generally be expressed as apparent acceleration increases, along with the development of fatigue, the gradual emergence of vibration velocity and displacement elevated, indicating that in bearing fatigue damage. Especially for bearing detection, careful attention to whether the value of unstable vibration swing (recommended analog pointer instrument, you can observe the very obvious), if there is swing, heralded the emergence of unstable vibration signals, acceleration also great, especially the speed while increasing, is likely to exist bearing "playing sets of" fault. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings for new equipment, testing and acceptance, although the vibration is very small, in line with national standards, but in the bearing parts appear small amplitude vibration swing phenomenon, exclude bearing with the problem (playing sets), the most likely bearing geometry problems, such as bearing steel ring oval, rolling through the major axis position, the gap may be due to reduced rolling moment stuck causing the subsequent rolling continue to squeeze, so that sliding friction rolling, rolling each one will appear in this sliding friction, resulting in unstable signal appears.

This problem is detected Shanxi 220KW new motor encountered, the disintegration of detectors to detect bearing, proved entirely correct judgment. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings Special Note: When checking bearings, we must not ignore the bearing acceleration values ??change. Better able to predict the acceleration of early bearing failure. Three. Domestic bearing quality testing of reference 1. Domestic bearing manufacturers product quality analysis reference (through the actual test statistics, under the premise of guaranteed genuine) ① deep groove ball bearings: Wafangdian Bearing Company, Harbin Bearing Company, Luoyang Bearing the company's product quality and performance is still good. ② Cylindrical roller bearings: Zhejiang Tianma Bearing Company's quality is better. ③ Tapered roller bearings: After the actual detection experiments and exploring the national quality inspection center bearing, currently only money flows, Zhejiang Wanxiang Group and Fujian I megabytes group bearing quality acceptable. ④ angular contact ball bearings: Currently Harbin bakelite bracket bearing quality is acceptable. Four. Bearing quality testing analysis reference KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings imported bearings quality inspection, the Japanese model of Authenticity bearing quality is still good; but finds a famous bearing quality not ideal, because the country is not the company bearing basic local production. On nominal origin Malaysia and Australia The grade bearing inspection found that its quality is far from ideal, even as regular domestic manufacturers of genuine bearings. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings Tip: Currently all forms of double row rolling bearings and pure axial thrust bearing countries do not have the appropriate testing standards. For angular contact ball bearing axial load to meet the requirements, you can see deep groove ball bearing quality level.