ntn bearing selection and guide precision quenching oil

1: ntn bearing quenching oil Optional:
1. Ordinary quenching oil (oil temperature at 60 ℃ for quenching)
Ordinary quenching oil is mainly applied to better hardenability alloy, such as small size bearing steel, mold steel part quenching. The past, only with different grades of domestic mechanical oil as quenching oil. The early 20th century, 80, in order to improve the performance of oil cooling, thermal oxidation stability and rust resistance, mechanical oil added to the reminder of cold, antioxidant and anti-rust agent, developed different grades of ordinary quenching oil, Its performance is better than machine oil.
Ordinary quenching salt bath furnace oil mainly used, box-type furnace, pit furnace quenching the general process, not mixed with other oils. Oil change, to thoroughly clean tank. Best use of the oil temperature is 50 ℃ ~ 80 ℃, the maximum temperature does not exceed 80 ℃, so as not to affect the service life. Should be installed in the mixing tank or oil circulating system to further improve the oil's cooling capacity to cool the workpiece surface can be uniform and should be regularly added to the tank in the new oil.
2. Vacuum quenching oil (oil temperature at 80 ℃, hardening)
Specific industrial sectors in general can not use heat treatment technology to meet the requirements, so the development of vacuum heat treatment technology. Vacuum quenching oil suitable for medium and large aviation structural steel, bearing steel, tool and die steel and other alloy steel hardened.
Initial use, should be 66 × 103 Pa under the pre-pumping 10min ~ 20min, mixed with the oil in the air prolapse and prevent the vacuum caused by the low tide in the air mixed with oil to bring the oil to the pipeline and within the vacuum unit.
3. Bright quenching oil (oil temperature quenching at 70 ℃)
Bright quenching oil is part Quenching in a controlled atmosphere of a cooling medium, whose main characteristic is the surface brightness components after quenching, after quenching is no longer the main treatment for secondary processing of small components, such as precision instrument parts, watches and small amount of parts and cutting tools. Bright quenching oil, other than to meet the cooling performance requirements, can prevent the formation of oxidation products of large micelles surface adhesion on parts and components have been attached to the surface of insoluble product replacement down the hardened surface of the parts to ensure bright.
Bright quenching oil is applied as a protective atmosphere furnace quenching cooling medium can be used in small cross-section bearing steel, Tool Steel, Measuring & Cutting Tool steel instrumentation Quenching also can be used for treatment of non-protective atmosphere quenching furnace with good steel hardenability . The oil temperature at 60 ℃ ~ 80 ℃ as well. Use the moisture content must be controlled, when the moisture content of greater than 200μg / g, the sharp decline in brightness, must deal with oil quenching, or quenching seriously affect the quality of parts.
2: Precision guides:
1. Vibration and stability:
Vibration of a guide rail and vice withstand the impact of forced vibration capability, and stability is a given operating condition does not appear self-excited vibration performance.
2. Motion sensitivity and precision:
Motion sensitivity refers to the exercise component to achieve the minimum travel; positioning accuracy is required exercise component to the ability to stop at the specified location. Motion sensitivity and precision and rail type, friction properties, velocity, drive stiffness, movement component quality and other factors.
3. Guiding precision:
Accuracy refers to the movement component oriented along the rail surface movement guidance accuracy of its trajectory. Affect the main factors guiding precision guide bearing surface geometry guided precision guide rail structure type, the contact rail Vice accuracy, surface roughness, rail, and the stiffness of supporting documents, guides the film thickness and film deputy stiffness , as well as rail and supporting documents such as the thermal deformation.
Geometric precision linear motion guides generally include: vertical plane and horizontal plane straightness; two parallel between the surface of rail. Geometric precision guide rail can be full length on the error or the error of that unit.
4. Accuracy retention:
Accuracy is a guide to keep track of the work process to maintain the capacity of the original geometric precision. Precision guide rail to maintain the wear resistance depends largely on the stability of most sizes. Wear resistance of materials and Guideway match, force, precision and lubrication methods and protective equipment performance factors, also, Slide and its supporting documents will also affect the residual stress within the precision of retention guide.

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