Inspection of Drawn Cup Needle Roller Bearings Before Assembly

Inspection of drawn cup needle roller bearings before assembly, in order to ensure the quality of bearing parts, bearing production plant usually also arrange a full inspection. Its inspection content: the appearance of the finished bearing parts, the finished bearing parts with the table roughness and roughness of the working surface, as well as measuring the bearing inner diameter size, outer diameter size, height size and inner ring inner diameter straightness.

1. Inner diameter size: use the bearing special testing instrument D923 (D924, D925) for inspection.

2. outer diameter size: using the bearing special testing instrument D913 (D914, D915) for full inspection.

3. Height dimension: use the bearing special testing instrument C903 (904, 905) for sampling inspection.

4. Inner ring bore verticality: use the bearing special testing instrument: C923 (C924C925) for full inspection or sampling inspection.

5. Finished parts appearance: mainly refers to the appearance of the previous processes inspection of missed products, missed processing process products and rust and bruises. Using visual inspection method for black skin, cracks, not chamfered, not carved grooves, not playing signs or signs missing pen, fuzzy surface defects such as 100% full inspection.

6. With the surface roughness: refers to the bearing outer circle, inner circle, end face and other surfaces with the box, arbor. End caps and other components with the surface roughness. Using the comparative method of visual full inspection, that is, under the diffuse light, the measured collar and the surface roughness of standard parts compared to 100% for inspection. When there is a dispute can be measured using the contour meter, its qualified determination can be based on GB307.3-1996 "rolling bearing general technical rules" standard in the relevant content.

7. Working surface roughness: refers to the inner groove (roll) channel and outer groove (roll) channel, retaining edge, etc. and steel ball (roller) contact surface roughness, each batch of ring sampling 3-5 pieces, using the contour meter for measurement, its qualified determination can be based on CS BTS T098.52-1999 "rolling bearing parts 1 ring surface roughness technical conditions" standard in the relevant content. The core content of these inspection items is to test the roughness of the working surface, because it directly affects the life of the finished bearing, vibration, rotational accuracy and other quality indicators, the quality of the bearing plays a key role. Therefore, some bearing manufacturers call the roughness of the working surface of the bearing as the key item of the bearing. In addition, according to the degree of influence of quality indicators on the quality of finished products, the working surface burn, metallography, hardness, cracks and other items are also known as the key items of bearings.

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