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NTN imports accurate grinding and external grinding of the bearing


14th December 2013 Bearing Technology 1 Comment

NTN imports accurate grinding and external grinding of the bearing

NTN imports the bearing all bearing network When the accurate grinding, because coarse to expect very much, grinding trace that working appearance presents can observe frequently the grinding trace of it appearance mainly has the following aspects with the naked eye:

Represent, appear, cross helical line reason of trace because bus wire of emery wheel flat and straightforward and poor mainly, the unevenness phenomenon exists, at the time of grinding, emery wheel and work piece are contacted by the part, after several back-and-forth movements of work piece or emery wheel, the work piece shows that will reproduce and cross the helical line and can observe the spiral collinear thread pitch and a speed, rotational speed of work piece of work piece are relevant in magnitude with naked eye, not parallel and relevant with shaft axis and work bench guide rail of emery wheel at the same time.

One Helical line formative to have reasons

1. good in stiffness in Vee way,when grinding deflect emery wheel, but keep in touch emery wheel edge as appearances working;

2.The communtation of the work bench is unstable in speed while repairing the noisy wheel, the precision is not high, make a certain edges of emery wheel slightly repaired little;

3.One’s own stiffness of the work piece is bad;

4.Break the scale specking under sand grain and work piece grinding peeling off very much to accumulate and attach to appearance of the emery wheel on the emery wheel, for this reason the emery wheel that should repair is washed or scrubed clean with the cooling water;

5.It is fine for emery wheel to repair, have some and protruding, etc.

Two Formative major cause of helical line

1.It is bad to repair the emery wheel, the corner has not chamfered, has not used the cooling fluid to repair;

2.Work bench guide rail lead lubricating oil to be too much, cause the work bench to float;

3.The lathe is not good in precision;

4.Squeezing action of grinding,etc..

1NTN imports the bearing and burns tiles:

There are more larger alloy abrasive grain and black metal oxide in the iron table.

2NTN imports the bearing tile to carry and inch to abrade:

Spectral analysis finds the iron density is unusual, there are a lot of iron composition submicrons that abrade the particle in the iron table, lubricating oil moisture and acid value are unusual.

3NTN imports the surface of the journal of the bearing to corrode:

Spectral analysis finds the iron element is unusual in density, there is one submicron of particles of a lot of iron compositions in the iron table, lubricating oil moisture exceed standard and acid value exceed standard.

4NTN imports the tiling of bearing to peel off:

Find in the iron table that there is a lot of larger fatigue that peels off the alloy and abrades the particle, lamellar abrasive grain. Bearing type inquiry of the car

5NTN imports the bearing appearance and is strained:

Find in the iron table that cuts the abrasive grain, the composition of the abrasive grain is the nonferrous metals.

6NTN imports the tiling of bearing to corrode:

Spectral analysis finds coloured metallic element is unusual in density; The submicron order of a lot of nonferrous metals compositions appears to abrade the particle in the iron table; Lubricating oil moisture exceed standard and acid value exceed standard.

7NTN imports the surface of the journal of the bearing and is strained:

Iron have ferrous to cut abrasive grain or black the intersection of oxide and particle in the table, metal appearance has back fire.










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