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Thermo-Mechanical Coupling Analysis of the Actuating Mechanism in a High Speed Press

  • Jin Cheng
  • Zhendong Zhou
  • Yixiong Feng
  • Zhenyu Liu
  • Yangyan Zhang
Regular Paper

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.

Keywords

Actuating mechanism High speed press Thermo-mechanical coupling analysis Thermal-mechanical coupling model Thermal stiffness 

Nomenclature

Fimp

impact load on lower surface of slider

Fsl

total equivalent force of slider

qsl

uniformly distributed load

Qs

heat generation power of sliding bearing

fs

friction factor of sliding bearing

Ps

radial force exerted on sliding bearing

Pap

average pressure exerted on sliding bearing

vs

relative peripheral velocity of sliding bearing

ns

relative rotary speed of sliding bearing

Qr

heat generation power of roller bearing

nr

rotary speed of roller bearing

Mr

total friction torque of roller bearing

M1

load torque

M2

viscous friction torque

P1

preload

dm

average diameter of roller bearing

Fr

radial load exerted on roller bearing

Co

equivalent static load

v0

kinematic viscosity of lubricant

hf

convective heat transfer coefficient

λf

thermal conductivity

ω

angular velocity of crankshaft

Cp

specific heat capacity of fluid

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Fluid Power & Mechatronic SystemsZhejiang UniversityHangzhouChina
  2. 2.Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of EducationHarbin Institute of TechnologyHarbinChina

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