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Text version of the page
| Linear Guideways General Information | |||||||||||||||
| 1-4 Service Life of Linear Guideways 1-4-1 Service Life When the raceway and the rolling elements of a linear guideway are continuously subjected to repeated stresses, the raceway surface shows fatigue. Flaking will eventually occur. This is called fatigue flaking. The life of a linear guideway is defined as the total distance traveled until fatigue flaking appears on the surface of the raceway or rolling elements. 1-4-2 Nominal Life (L) The service life varies greatly even when the linear motion guideways are manufactured in the same way or operated under the same motion conditions. For this reason, nominal life is used as the criteria for predicting the service life of a linear motion guideway. The nominal life is the total distance that 90% of a group of identical linear motion guideways, operated under identical conditions, can travel without flaking. When the basic dynamic rated load is applied to a linear motion guideway, the nominal life is 50km. 1-4-3 Calculation of Nominal Life The acting load will affect the nominal life of a linear guideway. Based on the selected basic dynamic rated load and the actual load, the nominal life can be calculated by using Eq. 1.2. L= • 50km=(y) • 31mile Eq.1.2 L : Nominal life C : Basic dynamic load rating P : Actual load | |||||||||||||||
| If the environmental factors are taken into consideration, the nominal life is influenced greatly by the motion conditions, the hardness of the raceway, and the temperature of the linear guideway. The relationship between these factors is expressed in Eq. 1.3. L= (-k^ f 50km= ( -k-ipi |3 31mile Eq.1.3 L : Nominal life fh : Hardness factor C : Basic dynamic load rating ft : Temperature factor Pc : Calculated load fw : Load factor | |||||||||||||||
| 1-4-4 Factors of Normal Life (1) Hardness factor ( fh ) In general, the raceway surface in contact with the rolling elements must have the hardness of HRC 58~62 to an appropriate depth. When the specified hardness is not obtained, the permissible load is reduced and the nominal life is decreased. In this situation, the basic dynamic load rating and the basic static load rating must be multiplied by the hardness factor for calculation. | |||||||||||||||
| Raceway hardness HRC 60 50 40 30 20 10 | |||||||||||||||
| /* 1.0 0.6 0.3 0.2 0.1 0.0 | |||||||||||||||