The main cause of helix formation
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| Time：2017.08.10 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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The main reason for bearing bearing surface grinding defects surface grinding defects there are many situations, such as bearing surface cross spiral line traces, bearing surface and bearing surface galling reproduction traces straight waveform traces, the main factors of these defects there are a lot of cases, the author will face one by one for everyone to answer.
Cross spiral line traces the emergence, bearing surface: the reason for this trace is mainly due to the bus straight wheel of existence, bump phenomenon, when grinding, the grinding wheel and the workpiece is only part of the contact, when the workpiece or wheel movement several times after the cross spiral line and workpiece performance will be reproduced in the naked eye can be observed. The pitch of these screws is related to the speed of the table and the speed of the workpiece, while the bearing is not parallel to the axis of the grinding wheel and the guide of the table.
The main cause of helix formation
1. The grinding wheel is poorly repaired, the edges and corners are not chamfered, and the coolant is not used for trimming;
2, the table guide lubrication too much, resulting in floating table;
3, the machine tool accuracy is not good;
4 、 excessive grinding pressure and so on.
Two, the bearing surface reproduction: the main reason of bearing surface galling traces of traces of reproduction is due to the coarse grain picking off caused by abrasive, abrasive sandwiched between the workpiece and the grinding wheel.
The surface of the workpiece in grinding is the specific reason is galling:
1, coarse grinding left behind traces, when grinding, did not wear off;
2 、 coarse grit and tiny abrasive particles are not filtered in coolant;
3, coarse grained grinding wheel, just when the good grinding, abrasive particles easily fall off;
4, material toughness validity or grinding wheel is too soft;
5, abrasive toughness and workpiece material toughness mismatch, etc..
Three, the surface of the workpiece with straight waveform trace: causes direct waveform is moving relative to a workpiece grinding wheel or wheel of grinding pressure is changed periodically caused by vibration reason. This vibration may be forced vibration or self-excited vibration, so the direct wave frequency on the workpiece is often more than one.
The specific reason for producing straight waveform traces is that:
1, grinding wheel spindle clearance is too large;
2, grinding wheel hardness is too high;
3, the grinding wheel static balance is not good or the grinding wheel is dull;
4, workpiece speed is too high;
5, Daotai large transverse qi;
6, grinding wheel spindle bearings wear, and the gap is too large, resulting in radial runout;
7, grinding wheel pressing mechanism or work table "crawling" and so on. |
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