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 Wysłany: Nie 16:31, 19 Gru 2010 Temat postu: ugg milano Use of HR-150 type hardness test vehicl |
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Use of HR-150 type hardness test vehicle planetary gear and driven gear cone surface hardness
Schematic driven gear (3) the device using the principle of a plane determined to be 3 (continued on page 23), D c l one hundred twenty-two) V0I. 29N0.2 (I993) volumes of physical toughness of a chemical test phase, the toughness meet plastic deformation, deformation to absorb the power, waving flip the crack tip stress concentration, and to the increase of the crack tip radius of curvature of passivation, the crack propagation change slowly. Our results showed that subcritical quenching the presence of ferrite can significantly improve the contact fatigue crack initiation life expectancy Qiu, however, the surface of the ferrite to prevent fatigue crack growth can not very well play a role, as shown in Table 5 , as the ferrite content increased, the initiation of life Qiu increased muscle also increased the total life, but the crack propagation rate of the share (Ⅳ J-N.) / decrease is probably due to the contrary, the sample before the initiation of macro cracks , F due to the initiation of many super-strain load was. Micro-cracks on the surface after the crack initiation, for the contact fatigue, the crack extension being subject to the maximum inward shear stress i | s role, but a very important factor is the role of oil, lubricating oil into the surface cracks formed High oil wedge,[link widoczny dla zalogowanych], wedge near the crack tip by oil combined effects of pressure and shear stress. And the stress is very large, making ultra-ferrite were internal crack in with the emblem of the increase of operating cycles, while growing up, you can connect more quickly leaving the crack propagation rate accelerated. Table 5 samples with different F contents than the reverse split of convergence extension (average) 3 Conclusions (1) 42CrMo steel subcritical two-phase zone to obtain M + F phase quenching organization in the hardness of HRC37, contact stress is 1592MPa, roughness 0.4, F ≤ 10 under the condition of content, with the increase of ferrite content. Contact fatigue life increased. (2) whether or not there exists F,[link widoczny dla zalogowanych], fatigue cracks initiate at the busy movement of all road surface, F can obviously improve the fatigue crack initiation life expectancy Ⅳ. ,[link widoczny dla zalogowanych], While no beneficial effects of crack growth rate. (3) material from the full potential and safety aspects into account, the hardness of materials should be on the pitting growth rate curve tangent tB corresponding to the operation of a one week time. As a failure criterion, 'v Port pitting growth rate corresponds to the slow expansion of the curve with the rapid expansion of the cut-off point. References 1 bundle of pro-nine, and so on. Proceedings of the Third International Conference of Materials and Heat Treatment, Mechanical Industry Press, 1985,6:32 ~ 4l2 Wangzhuan Ya. Metals. 1980 (2): l ~ l53 Hill Tianbang Bo, et al. 13 Society of Mechanical Engineers, 3d d States Last Volume 257, Wu, et al. Japan Society of Mechanical Engineers, Volume 5, No. 371 Lin He shot,[link widoczny dla zalogowanych], and so on. Physical Testing and Physical Testing. 1990 (1): 26 ~ 296 Chen Gang, et al. Section Zhu Luoyang Bearing Research Institute report, l9847 Shore jade. Physical Testing and Physical Testing, 1981 (3) closed gather in harvest date: l991739 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● t ● ● ● ● ● ● ● _ ● ● ● ● ● ● ● ● ● ● ● (on the next page 4 bit off. 3 as the support surface, to address A with the support of top gear test \Figure 4 pigsty special bevel driven gear hardness test station I. Balanced block 2. Hardness indenter 3. Pins (3-4J16 uniform circle in 4H45) 4. Cone driven gear 5. Pallet 6. Hardness of the wall connecting shaft 7 bar (4) to eliminate the weight shift caused by the instability of the device phenomena, specially designed for equipment design balanced block l, in order to ensure the overall test sets under the steady state hardness test. 2.2 Design Points (1) pins 3 \* \G-block gear weight of a balance weight 0 f, - shown in Figure 4 (3) The hardness of HR for a 150 limited studio space, and loading and unloading station for the test and test operation convenience, the pallets should be designed to be rectangular,[link widoczny dla zalogowanych], and the principle of size as small as possible. (4) The larger the device, easy to produce biased towards the phenomenon. Therefore, the connecting shaft. 6 and hardness of wire Xuan \gear surface hardness, trial easy to operate, and to ensure the accuracy and reliability of test results to solve this part of my plant before the results of the hardness of the problem for reference only. Received date; 1992.8.3.
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