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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The reason and shortcomings of bearing surface grinding Reasons for the appearance of bearing surface grinding and its analysis
In the process of grinding, the surface of the bearing is ground by a grinding wheel that rotates at a high speed. Therefore, if it is not operated and adjusted according to the operation instructions during grinding, it will present various shortcomings in the bearing operation, resulting in influence. The overall quality of the bearing? When the bearing is in fine grinding, because of the high demand for roughening, the grinding marks on the exterior of the work can often be observed with the naked eye. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The reason for presenting the traces of the interspersed spiral traces is that the traces of the casters of the grinding wheel are poor, and there are embossed appearances. When grinding, the grinding wheel and the workpiece only have some touches. When the workpiece or the grinding wheel reciprocates several times, The workpiece embodiment will reproduce the interpenetrating spiral and can be observed by the naked eye. The pitch of these spirals is related to the workpiece table speed and the workpiece rotation speed. It is also related to the grinding wheel axis and the worktable rail.
(1) The primary cause of the spiral structure is 1. The grinding wheel is poorly trimmed, the corners are not chamfered, and the coolant is not used for dressing;
2. The workbench guide rail guides too much lubricating oil, causing the workbench to float;
3. The machine tool accuracy is not good;
4. Is the grinding pressure too large?
(2) The cause of the spiral is composed of 1. The rigidity of the V-shaped guide rail is not good. When grinding, the grinding wheel is offset, and only the edge of the grinding wheel touches the surface of the work;
2. When the quarrel is repaired, the commutation speed of the workbench is unstable, and the precision is not high, so that the margin of the grinding wheel is slightly less trimmed;
3. The workpiece itself is poorly rigid;
4. On the grinding wheel, the sand that has been broken and dropped and the iron scraps under the grinding of the workpiece are attached to the outer surface of the grinding wheel. For this purpose, the finished grinding wheel should be washed or rinsed with cooling water;
5. The grinding wheel is not well trimmed, is there a part of the bulge?
The main reason for the appearance of the scale-like appearance of fish scales is that the cutting edge of the grinding wheel is not sharp, and the phenomenon of "squatting" occurs during grinding. At this moment, the oscillation is large. The detailed reason for the appearance of the fish scales on the surface of the workpiece is:
1. There are waste and oil on the surface of the grinding wheel;
2. The grinding wheel is not trimmed;
3. The grinding wheel becomes dull? The trimming is not sharp;
4. The diamond fastening frame is not strong, the diamond is rocking or the diamond quality is not good enough;
5. Is the hardness of the grinding wheel uneven?
The main reason for the reappearance of the fluffing marks on the surface of the working surface is that the coarse-grained abrasive grains fall behind and the abrasive grains are formed between the workpiece and the grinding wheel.
The detailed reason for the appearance of the workpiece when it is being ground during grinding is:
1. Traces left over from rough grinding, not worn away during fine grinding;
2. The coarse abrasive grains and fine abrasive grains in the coolant are not cleaned;
3. When the coarse-grained grinding wheel is just finished, the abrasive particles are simply dropped;
4. The useful period of data tolerance or the grinding wheel is too soft;
5. Is it difficult to cooperate with the resistance of the workpiece and the resistance of the workpiece?
The surface of the workpiece has a straight wave trace. We cut the cross-section of the vertical axis of the milled workpiece and expand it. It can be seen that its periphery is similar to a sine wave. It has no transitional translation along the axis of the axis. The orbit around the sine wave is The corrugated cylinder, also known as the polygon?
The reason for the straight waveform is the movement of the grinding wheel relative to the workpiece or the periodic change of the pressure of the grinding wheel on the workpiece to cause oscillation. This oscillation may be forced oscillation or self-oscillation, so the workpiece is straight. There are often more than one wave frequency?
The detailed cause of a straight waveform trace is:
1. The gap of the grinding wheel spindle is too large;
2. The hardness of the grinding wheel is too high;
3. The static balance of the grinding wheel is not good or the grinding wheel becomes dull;
4. The workpiece speed is too high;
5. The transverse feed is too large. The grinding wheel spindle bearing wears, the cooperation gap is too large, and the radial runout occurs;
7. Is the grinding wheel compacted or the workbench “åŒåŒâ€?
The surface of the workpiece reproduces the burn marks. The appearance of the workpiece tends to burn during the grinding process. There are several types of burns. One is that the burn is in the direction of the grinding wheel, and it is dark black plaque; the second is a line or intermittent line?
The appearance of the workpiece is burned during the grinding process, which can be summarized as follows:
1. The grinding wheel is too hard or the grain size is too fine to be too dense;
2. The feed rate is too large, the supply of cutting fluid is lacking, and the heat dissipation condition is poor;
3. The workpiece speed is too low and the grinding wheel speed is too fast;
4. The wheel oscillating is too large, and the burn is caused by the constant change of the grinding depth;
5. The dressing of the grinding wheel is not timely or the repair is not good;
6. The diamond is sharp and the grinding wheel is not well trimmed;
7. When the workpiece is coarsely ground, the burn is too deep, and the amount of fine grinding is too small to be worn off;
8. There is a lack of clamping force or suction force of the workpiece. Under the effect of grinding force, the workpiece has a stalling appearance, etc.?
Then how does the appearance of the workpiece know how to burn in the grinding process? This should be checked out after regular pickling?
After the workpiece is pickled, when the surface is wet, it should be visually inspected under the astigmatism lamp. The normal appearance is evenly dark gray. If it is a software point, it will appear cloud-like dark black mottled and the perimeter is not fixed; if it is decarburized, it will be presented. Gray or dark black spots; if the crack is ground, the crack is cracked, such as burns, first, the appearance of dark black plaques along the direction of the grinding wheel, and the second is the appearance of lines or intermittent lines?
If the above-mentioned burn appearance appears in the grinding process, it is necessary to analyze the cause in time, adopt a useful method to solve it, and eliminate the mass burn?
Appearance roughness does not meet the requirements of the bearing surface roughness of the specification and process requirements, but in the grinding process and ultra-fine process, due to various reasons, often can not meet the requirements of the rules? The primary reason for demand is:
1. The grinding speed is too low, the feed speed is too fast, the feed rate is too large, and the feedless grinding time is too short;
2. The workpiece speed is too high or the workpiece axis and the grinding wheel shaft oscillate too much;
3. The grinding wheel is too thick or too soft;
4. The dressing speed of the grinding wheel is too fast or the trimming arrangement is too large;
5. The diamond of the dressing wheel is not sharp or of poor quality;
6. The quality of ultra-precision oilstone is not good, and the orientation of the device is incorrect;
7. The quality of ultra-fine kerosene is not up to demand;
8. Super fine time is too short;
Only need to strictly follow the operation instructions to carefully operate and view, present problems and analyze the causes in time, and solve them. These shortcomings can be prevented, and then ensure the overall quality of the products?
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1. Sodium Chlorite
Properties: White or light yellow greenish crystal, basic, slightly absorb moisture,easily soluble in water and alcohol. Sodium chlorite is stable in normal condition, it release chlorine dioxide when meet acid. If contact with wood scraps, organic compounds, reducing substances, or if knocked or rubbed, it is easy to explode or burn. Toxic!
Uses: Used in producing chlorine dioxide, or bleaching textiles, fiber, paper pulp, sand sugar, flour, wax, fruit etc, or certain metal surface treating, drink water and waste water purification etc.
Package and symbol: Solid: net weight 50kgs iron drum with plastic liner, or following customer's demand.
Source: Bearing network time: 2014-04-12