Bearing is good, ultra precision is important!

Bearing superfinishing which superfinishing process is not only used in bearing industry, also used the engine area is very much, other aspects of precision machinery and instrument to use this process over lapping is defined as a kind of feed movement, in order to realize the trace of grinding a finishing machining method. Superfinishing surface general precision car before cutting, grinding, ultra precision master WeChat: 2966884113 specific refers to the good lubrication cooling conditions, with fine-grained grinding tool ( Sharpening stone) A small pressure of workpieces, and do workpiece rotate in vertical direction, to make fast and at a certain speed rotating workpiece bursts of reciprocating oscillation motion of a finishing machining method. Ultra lapping role in the process of rolling bearing manufacturing, superfinishing are the last line of bearing ring processing working procedure, to reduce or eliminate grinding legacy of circular deviation, repair the shape of the channel error, refining its surface roughness, surface physical and mechanical properties improved, reducing the vibration of the bearing, noisy, improve the bearing's mission, plays an important role. Concrete to be reflected in the following three aspects: 1, can effectively reduce the waviness. In ultra lapping process, in order to be able to guarantee the oil-stone always ACTS on the wave without contact with the troughs, abrasive and the workpiece in contact arc of workpiece surface waviness or wavelength, so that the peak contact pressure is bigger, convex peak is removed, thereby reducing the waviness. Master of superfinishing WeChat: 29668841132, the improvement of the ball bearing raceway groove shape error. Ultra lapping can be effectively improved by about 30% of raceway groove shape error. 3, can make be ultra lapping surface compressive stress is produced. Ultra lapping process, mainly produces cold plastic deformation, thus making ultra lapping, the workpiece surface residual compressive stress 4, can increase the contact area on the surface of the ring work. Super after lapping, ring work surface contact bearing area by 15% ~ 40% after grinding, increased to 80% ~ 95%. Superfinishing process 1, bearing surface of the stone cutting and rough on the surface of the raceway convex peak in contact, because contact area is smaller, the force per unit area is larger, under certain pressure, the stone first 'cutting' effect by bearing the workpiece, the part on the surface of the stone grinding grain fall off and broken, show some new sharp abrasive grain and the edge. Peak at the same time, the convex surface of the bearing parts are fast cutting, cutting and cutting through the role of the convex peak and remove bearing the workpiece surface grinding metamorphic layer. This phase is called cutting stage, at this stage to remove most of the metal allowance. About two and a half, bearing the cutting to continue with the processing, bearing the workpiece surface gradually be ground flat. At this point, the millstone and the surface contact area increases, the pressure on unit area is reduced, cutting depth, cutting ability. At the same time, the stone surface pores blocked, millstone is cutting state. This phase is called bearing finishing half cutting stage, bearing the workpiece surface cutting in half cutting phase trace becomes shallow, and a dark gloss. 3, finishing stage at this stage can be divided into two steps it is grinding transitional phase 2 is to stop the grinding of cutting after grinding the transition phase to decrease grinding grain from less, abrasive blade edge is smooth, chip embedded oxide start sharpening stone gap, abrasive powder blocking oil stone hole, can only make the grits weak cutting, accompanied by squeezing and light effect, workpiece surface roughness quickly cut at this moment, a black chip oxide attached oil stone surface. Stop cutting grinding stage sharpening stone and workpiece rubbing against each other is very smooth, greatly increase the contact area and pressure drop, grits can not wear out the oil film in contact with the workpiece, when on the surface of the bearing oil film pressure and oil-stone phase equilibrium, oil stone was floating up. In the oil film formation, then have no cutting action. This stage of superfinishing. A: all kinds of bearing characteristics and USES: next article about bearing failure!