Abstract
In order to ensure the manufacturing precision of an ultra-precision high speed press, an integrated thermo-mechanical coupling model of its actuating mechanism is proposed, which includes the mechanical models of the slider and crankshaft, the thermal models for calculating the heat generation powers at different bearings as well as the heat transfer and heat dissipation in the actuating mechanism. The validity of the proposed thermo-mechanical coupling model is verified by a thermal equilibrium experiment when the press operates under the full load of 3000kN at 300 rpm. A sensitivity analysis is conducted to investigate the simulation errors resulting from the variation of the ambient temperature, the results of which demonstrate that the average ambient temperature should be applied for improving simulation accuracy. Then the thermal stiffness of the actuating mechanism and the thermo-mechanical coupling characteristics of different parts are analyzed by the proposed model with the average ambient temperature applied. The influences of the thermally induced loads on the thermal stiffness are discussed in detail. It is concluded that the temperature rise of the actuating mechanism in the stamping process of a high speed press should be fully considered in the design phase for ensuring its manufacturing precision.
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Abbreviations
- F imp :
-
impact load on lower surface of slider
- F sl :
-
total equivalent force of slider
- q sl :
-
uniformly distributed load
- Q s :
-
heat generation power of sliding bearing
- f s :
-
friction factor of sliding bearing
- P s :
-
radial force exerted on sliding bearing
- P ap :
-
average pressure exerted on sliding bearing
- v s :
-
relative peripheral velocity of sliding bearing
- n s :
-
relative rotary speed of sliding bearing
- Q r :
-
heat generation power of roller bearing
- n r :
-
rotary speed of roller bearing
- M r :
-
total friction torque of roller bearing
- M 1 :
-
load torque
- M 2 :
-
viscous friction torque
- P 1 :
-
preload
- d m :
-
average diameter of roller bearing
- F r :
-
radial load exerted on roller bearing
- Co :
-
equivalent static load
- v 0 :
-
kinematic viscosity of lubricant
- h f :
-
convective heat transfer coefficient
- λ f :
-
thermal conductivity
- ω :
-
angular velocity of crankshaft
- C p :
-
specific heat capacity of fluid
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Cheng, J., Zhou, Z., Feng, Y. et al. Thermo-Mechanical Coupling Analysis of the Actuating Mechanism in a High Speed Press. Int. J. Precis. Eng. Manuf. 19, 643–653 (2018). https://doi.org/10.1007/s12541-018-0078-z
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DOI: https://doi.org/10.1007/s12541-018-0078-z