In order to prevent or reduce the deformation of thin-walled bearing ring, should adopt the third processing scheme and the corresponding measures. ①rough workpiece, fine car, rough car as much as possible to place a period of time after the natural cooling of the workpiece to eliminate heat deformation may occur during processing. ② using axial compression, changing the role of clamping force point, so that the workpiece can not be deformed. When using the end face clamping bore positioning, due to the existence of the gap within the hole, so the product is rough ③ processing, fine car when using coolant. Turning process, due to cutting deformation and chip, the friction between the tool and the workpiece will produce a lot of heat. The existence of cutting heat, thin-walled parts of the car is very unfavorable. Therefore, the turning, the correct choice of metal cutting fluid, full use of coolant, not only can reduce the cutting temperature, reducing the cutting force, the tool durability has been improved, and the workpiece surface roughness value is also reduced, reducing cutting power , The workpiece is not affected by cutting heat, the change in shape and position error is small, to ensure the quality of parts. When using high-speed steel cutting tools for roughing, the main cutting area to reduce temperature and improve tool durability, should choose the cooling of the metal cutting fluid, such as low concentrations of emulsion. When using carbide cutting tools for roughing, cutting fluid must be continuous, fully pouring, generally do not use cutting fluid. Finishing, the main role of cutting fluid is to improve the workpiece accuracy and reduce the surface roughness value, the choice of concentration of 10% to 20% emulsion or ionic cutting fluid. ④ rational use of cutting dosage, reduce deformation. Roughing, you can use to increase the amount of feed back ap and feed f. Fin finishing back eat knife ap optional 012 ~ 015mm, feed is generally 011 ~ 012mm, or even smaller. For cutting speed according to the workpiece material, workpiece diameter, tool material and angle control in a certain range, generally take v = 6 ~ 120m / min, at the same time should prevent the workpiece resonance. ⑤ reasonable choice of tool geometry point of view. Turning thin-walled workpiece, should pay attention to the choice of primary declination Kr, so that the axial force or radial force in the direction of poor rigidity decreases, cutting edge angle λs to take a positive value, the edge to be sharpened sharp edge and rake angle Should be made accordingly. Such as the outer radius of the fine-knives Kr = 90 ° ~ 93 °, Kr '= 15 °, αo = 14 ° ~ 16 °, αo1 = 15 °. The inner hole turning tool Kr = 60 °, Kr '= 30 °, αo = 14 ° ~ 16 °, αo1 = 6 ° ~ 8 °.
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